CN102588561A - Transmission box body - Google Patents

Transmission box body Download PDF

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Publication number
CN102588561A
CN102588561A CN2012100127408A CN201210012740A CN102588561A CN 102588561 A CN102588561 A CN 102588561A CN 2012100127408 A CN2012100127408 A CN 2012100127408A CN 201210012740 A CN201210012740 A CN 201210012740A CN 102588561 A CN102588561 A CN 102588561A
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CN
China
Prior art keywords
internal gear
gear
horn
deformation
mission case
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Granted
Application number
CN2012100127408A
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Chinese (zh)
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CN102588561B (en
Inventor
大塚智之
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Nidec Shimpo Corp
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Nidec Shimpo Corp
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Publication of CN102588561B publication Critical patent/CN102588561B/en
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Abstract

The invention provides a transmission box body, which enables an inner gear to be stably and firmly connected to the transmission box body. The transmission box body includes a first box body part (10) surrounding the periphery of a sun gear (31) and a planet gear (32), and an cylinder inner gear (33) is fixedly arranged at the inner side of the first box body part (10) with a rotation axial line (A) consistent with a solar gear (31). One end of the inner gear (33) is provided with an annular plate (53) protruding more inwardly than the end of teeth. The periphery of the inner gear (33) is provided with concave and convex anti-slipping protions (54). The first box body part (10) is molded by die casting, and the inner gear (33) is molded at the first box body part (10).

Description

Mission case
Technical field
The present invention relates to be provided with the mission case of internal gear.
Background technique
The known in the past speed changer that has retarder iso-variable velocity unit to use planetary gears.Planetary gears generally is made up of sun gear, a plurality of planetary pinion, planet carrier and internal gear etc.
For example, if retarder, each planetary pinion is supported on the planet carrier that is connected with output shaft with the mode that can rotate freely, and is configured in around the sun gear with the mode with sun gear engagement.Internal gear with the mode that can not rotate be configured in these planetary around and with the engagement of these planetary pinions.Through sun gear is rotated driving, each planetary pinion revolves round the sun around sun gear.Be accompanied by planetary revolution, planet carrier slows down and rotates, and its rotating power is exported through output shaft.
Usually, internal gear is embedded in the inboard of mission case, and for example medium through pin being embedded into the pin-and-hole that is formed at internal gear and mission case both sides, internal gear is fixed in mission case.
About the present invention, disclose the production method (patent documentation 1) of gear and embedded with gear (patent documentation 2).
In patent documentation 1, disclosing main part is the production method of the gear of resin forming spare or die castings.Specifically, the steel plate of band shape is implemented the tooth portion that roll forming forms flat dentation, this tooth portion circumflexion is formed tooth portion ring.Use mould to inject the synthetic resin or the alloy of fusion and make its curing to the inboard of said tooth portion ring, making gear forming thus is one.
In patent documentation 2, disclose such gear: when gear was carried out die cast, synthetic resin that can prevent fusion etc. flow in the teeth groove.Specifically, this gear constitutes general cylindrical shape shape, is formed with teeth groove at the outer circumferential face of gear.And the periphery in a side of this gear is formed with the lip part of the inflow that stops shaping material.
Patent documentation 1: japanese kokai publication hei 7-125088 communique
Patent documentation 2: Japan opens clear 51-158961 communique in fact
In planetary gears, because internal gear is applied big torque, therefore, under the situation of internal gear,, then possibly cause dislocation or rock etc. if engage fully inadequately through the fixing existing mission case of pin.Therefore, both require the formed precision and the assembly precision of height, become obstacle aspect the cost of production boosting productivity and suppress.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of mission case, can be with internal gear stable and be engaged in mission case securely, can boost productivity and reduce production costs.
In order to reach above-mentioned purpose, in the present invention, on the basis of the shape of internal gear having been carried out research, this internal gear embedding has been molded in the box part.
Specifically, mission case of the present invention is such mission case, and it comprises: box part, its surround sun gear and planetary around; And internal gear cylindraceous, it is fixed on the inboard of said box part with the spin axis state consistent with said sun gear.
Be provided with the inflow limitation part of the ring-type that the end than tooth leans out to the inside at an end of said internal gear.Outer circumferential face at said internal gear is provided with antiskid part, is formed with more than one protuberance or recess in this antiskid part.And, the moulding of said box part through die casting, said internal gear embeds and takes shape in said box part.
Mission case according to such structure; Be provided with the inflow limitation part of the ring-type that the end than tooth leans out to the inside at an end of internal gear; This internal gear embeds and takes shape in the box part of die cast, therefore, and when internal gear is assemblied in the core of mould; Flow into limitation part and contact, the part (ring tooth) of tooth that so then can be through the airtight internal gear that is positioned at die cavity of core and inflow limitation part with core.
Therefore, can prevent that the shaping materials such as aluminum alloy of fusion from getting into the situation of ring tooth, can not damage the quality of ring tooth, can save unnecessary operations such as removing of fusion bits.
Take shape in box part because internal gear embeds,, also can stablize and engage securely internal gear more even therefore guarantee formed precision and assembly precision highly unlike the fixing that kind that waits of pin in the past.Since need not sell the fixing operation that waits yet, therefore very favourable aspect productivity and cost of production.And, be provided with the antiskid part that has formed more than one protuberance or recess at the outer circumferential face of internal gear, therefore, the bonding area of internal gear and box part increases, and can engage more securely.
Preferably, said inflow limitation part is made up of the circular parts that form with said internal gear split, is installed on said internal gear after the said inflow limitation part.
Like this, can form the part of ring tooth through broaching processing, therefore volume production internal gear easily is very outstanding aspect productivity and cost of production.
In addition, preferably, said antiskid part is made up of the concaveconvex structure with the wire of spin axis almost parallel.
Like this, utilize antiskid part, can bear the bigger torque that puts on internal gear when using effectively, therefore can more stably prevent the dislocation of internal gear or rock.
In addition, preferably, the outside that said box part is being fixed with the part of said internal gear have extend along the spin axis direction and the situation of the horn-like part that the cross section is outstanding under, blowhole is set prevents portion with the deformation that occupies predetermined volume.
When having at box part under the situation of such horn-like part, because the difference at position, the amount of shaping material has imbalance, and therefore, the rate of cooling when shaping material solidifies has deviation and makes box part produce deformation.Consequently internal gear is applied unbalanced deformation power, so the roundness of internal gear can reduce.
Relative therewith, through blowhole is set, can eliminate imbalance to a certain degree, to close at withdrawing pattern and fasten, the length of blowhole and shape are owing to the glide direction of mould etc. and restricted greatly.Therefore, if only depend on blowhole, according to the difference of the shape of the box part of moulding, the distribution of shaping material can produce imbalance.Therefore, prevent portion outside blowhole, can replenish the part that only depends on blowhole to replenish through deformation is set separately.Consequently, can make the distribution homogenization of internal gear aluminum alloy on every side, can suppress internal gear is applied unbalanced deformation power, can improve the roundness of internal gear.
For example, under the situation that said blowhole extends along the spin axis direction, preferably lean on inboard position that said deformation is set and prevent portion at end than said blowhole.Like this,, also can adjust the amount of the shaping material of heavy section, therefore can be suppressed to the imbalance of the distribution of type material through the deformation portion of preventing even exist under the situation of heavy section at the end side of blowhole.
Said deformation prevents that portion can be arranged to one with said internal gear.
Like this, also can obtain the effect same with antiskid part through the deformation portion of preventing, therefore can be with internal gear stable more and be engaged in box part securely.In addition, can structurally strengthen internal gear, can further improve the roundness of internal gear through the deformation portion of preventing.
The invention effect
Compare with utilizing the fixing mission case in the past of having fixed internal gear that waits of pin, can be with internal gear stable and be firmly fixed at mission case.Therefore the formed precision and the assembly precision that do not need height can boost productivity and reduce production costs.
Description of drawings
Fig. 1 is the summary stereogram of the speed changer of this mode of execution of expression.For inside is shown, the part of speed changer is dissectd.
Fig. 2 is the summary sectional view along the box part of the X-X line among Fig. 1.The part of ring tooth only illustrates a part.
Fig. 3 is the synoptic diagram of the box part seen of the arrow Y direction from Fig. 2.
Fig. 4 is the summary stereogram of expression internal gear part.The part of ring tooth and antiskid part only illustrates a part.
Fig. 5 is the summary planimetric map of internal gear part.
Fig. 6 is the synoptic diagram of the forming process of expression first box part.
Fig. 7 is the synoptic diagram of the forming process of expression first box part.
Fig. 8 is mensuration result's the synoptic diagram of the roundness of the internal gear of expression in the comparative example.
Fig. 9 is mensuration result's the synoptic diagram of the roundness of the internal gear of expression among the embodiment.
Figure 10 is the summary stereogram of the variation of expression internal gear part.The part of ring tooth and antiskid part only illustrates a part.
Among Figure 11 (a) and (b) be the summary front view of variation of expression mission case.
Figure 12 is the summary sectional view of the variation of expression mission case.
Figure 13 is the summary sectional view of the variation of expression mission case.
Label declaration
1: casing (mission case);
2: input part;
3: planetary gears;
4: output shaft;
10: the first box parts (box part);
11: surrounding wall portion;
11a: horn-like part;
12: end wall;
16: blowhole;
18: heavy section;
31: sun gear;
32: planetary pinion;
33: internal gear;
34: planet carrier;
50: internal gear part;
51: gear part
51a: ring tooth;
52: deformation prevents portion;
53: annular plate (inflow limitation part);
54: antiskid part;
A: spin axis.
Embodiment
Below, according to accompanying drawing mode of execution of the present invention is elaborated.But following explanation only is an illustration in essence, this explanation not to the present invention, its application products with and uses thereof limit.
Fig. 1 representes to have used retarder of the present invention (speed changer).Retarder has casing 1 (mission case), input part 2, planetary gears 3 and output shaft 4 etc.In this retarder, the live axle of motor etc. is connected with input part 2, and thus, rotary driving force is input to the retarder from input part 2.Utilize planetary gears 3, its rotational speed is slowed down, the rotary driving force that has raise through output shaft 4 output torques.
Planetary gears 3 is made up of sun gear 31, a plurality of planetary pinion 32, internal gear 33 and planet carrier 34 etc.Sun gear 31 is supported on casing 1 with the mode that can rotate freely, and sun gear 31 is by means of being the center rotation from the rotary driving force of input part 2 input and with spin axis A.Each planetary pinion 32 is configured in around the sun gear 31 with the mode with sun gear 31 engagements.Each planetary pinion 32 is supported on planet carrier 34 with the mode that can rotate freely.Planet carrier 34 is through pair of bearings 35a, 35b and be supported on casing 1 with the mode that can rotate freely.In this mode of execution, output shaft 4 is set as one with planet carrier 34.
Internal gear 33 is that tooth is formed on inboard gear.Internal gear 33 is with the mode of each planetary pinion 32 engagement of exposing with the 34a of window portion from the side that is formed at planet carrier 34, so that the consistent state configuration of spin axis A and sun gear 31 is around them.Internal gear 33 is configured in the inboard of casing 1 with the mode that can not rotate.Therefore, along with the rotation of sun gear 31, each planetary pinion 32 rotation and around sun gear 31 revolution are followed in this, and planet carrier 34 (output shaft 4) is the center rotation with predetermined reduction speed ratio with spin axis A.In addition, will narrate separately at the back literary composition for the details of internal gear 33.
The casing 1 of this mode of execution becomes one by docking each other first box part 10 (box part) and second box part 20 constitute.Input part 2 is accommodated in second box part, 20 sides, comprises internal gear 33, and planetary gears 3 is accommodated in first box part, 10 sides with output shaft 4.Said first box part, 10 grades are used shaping material moulding through die casting such as aluminum alloy.
Fig. 2 and Fig. 3 represent the details of first box part 10.First box part 10 has: the cross section in the outside forms tetragonal surrounding wall portion 11; And the end wall 12 of stopping up an end of surrounding wall portion 11.Comprise sun gear 31 and planetary pinion 32 planetary gears 3 around surrounded by surrounding wall portion 11.
At the middle body of end wall 12, be formed with and be cylindric outstanding bearing holding part 13.In the inboard of this bearing holding part 13, embed and be fixed with above-mentioned bearing 35a.And the end portion of output shaft 4 is passed the axis hole 14 of the central authorities that are opened in bearing holding part 13 and is projected into the outside of casing 1.
The part at each angle in surrounding wall portion 11 (horn-like part 11a) is penetrated with along spin axis A direction and is used for carrying out fastening bolt hole 15 (4 place) with second box part 20.In addition, be formed with blowhole 16 at each horn-like part 11a.
The blowhole 16 of this mode of execution extends from opening side (opposition side of end wall 12) along spin axis A direction, and inner circumferential surface is the arcuation face 16a of arcuation and from arcuation face 16a laterally continuously and avoid bolt hole 15 and form the W word shape face 16b that the cross section is W word shape and constitute by the cross section.The blowhole 16 of this mode of execution forms the thinner shape (pattern draft) of end that the cross section reduces towards end gradually.In addition, pattern draft is not that blowhole 16 is necessary, as long as end side unlike terminal side greatly.
In the inboard of surrounding wall portion 11, be formed with big footpath hole portion 17 from opening side towards end wall 12, this big footpath hole portion 17 is communicated with bearing holding part 13, and internal diameter is bigger than bearing holding part 13.The degree of depth of big footpath hole portion 17 forms forr a short time than the length (in Fig. 2, representing with label t) of surrounding wall portion 11, in surrounding wall portion 11 and attachment portion end wall 12, has heavy section 18, and the thickness of this heavy section 18 is thicker than the thickness of other part in the surrounding wall portion 11.In the big directly inboard (part at the end) of hole portion 17, be fixed with internal gear part 50 integratedly through embedding moulding.
Fig. 4 representes the details of internal gear part 50.Internal gear part 50 is steely parts, and it has: gear part cylindraceous 51, the deformation that forms as one with gear part 51 prevent portion 52 and annular plate 53 (inflow limitation part).Gear part 51 is the positions that constitute internal gear 33.At the inner peripheral surface of gear part 51, be formed with the one group of tooth (ring tooth 51a) that meshes with each planetary pinion 32 in the form of a ring through broaching processing.
Annular plate 53 with respect to gear part 51 and deformation prevent portion 52 is provided with separately, by the circular parts that sheet metal cutting forms, be installed on gear part 51 etc. thereafter.Annular plate 53 through welding wait be fixed in gear part 51 prevent an end of portion's 52 sides by deformation, and closely contact with the end of ring tooth 51a.Annular plate 53 is configured to its inner circumference edge and leans out to the inside than the end of each tooth.
At the outer circumferential face of gear part 51, be formed with antiskid part 54 in the complete cycle scope.The antiskid part 54 of this mode of execution is made up of the concaveconvex shape of a plurality of wire of extending with spin axis A almost parallel ground.The cross section of antiskid part 54 forms sharp keen broken line shape.
Through the outer circumferential face in gear part 51 such antiskid part 54 is set, when internal gear part 50 embeddings were taken shape in first box part 10, both bonding areas increased, and therefore can engage more securely.And, constitute by the concaveconvex shape of a plurality of wire of extending with spin axis A almost parallel ground through making antiskid part 54, can bear the big torque that puts on ring tooth 51a effectively, therefore, can prevent the dislocation of gear part 51 or rock.
Deformation prevents that portion 52 has: the extension part 52a cylindraceous that extends continuously with an end of gear part 51; And the lip part 52b that leans out to radial outside in the complete cycle scope from the end of extension part 52a.As shown in Figure 5, the opposed position of part (limit portion) with limit surrounding wall portion 11 lip part 52b forms and surrounding wall portion 11 almost parallels, and each opposed position of horn-like part 11a lip part 52b and surrounding wall portion 11 forms circular-arc.The position of horn-like part 11a side leans out manyly than the position of limit portion side.
Internal gear part 50 is to take shape in first box part 10 with annular plate 53 sides towards the state embedding of end wall 12, and deformation prevents that portion 52 is embedded in the heavy section 18.Like Fig. 2 and shown in Figure 5, particularly at horn-like part 11a, lip part 52b enters into the inside (downside) of the end of blowhole 16 and has occupied predetermined volume.More detailed, the limit portion and the horn-like part 11a at the part place around internal gear part 50 have carried out adjustment through lip part 52b and blowhole 16 and have made the shared volume of part of aluminum alloy equate as far as possible.
Aspect the relation of withdrawing pattern, blowhole 16 can't make its end side increase, therefore, though relevant with mould, only guarantee enough volumes and be not easy at heavy section 18 through blowhole 16.Particularly when moulding, use by only under the situation of the simple die that a pair of mould of a direction slide relative constitutes, very difficulty.Therefore, prevent portion 52, can prevent that portion 52 from replenishing the not enough part of volume through deformation through deformation being set separately with respect to blowhole 16.Like this, through making the distribution homogenization of internal gear part 50 aluminum alloy on every side, can suppress the deformation of gear part 51 effectively.
Next, with reference to Fig. 6 and Fig. 7 the general forming process of first box part 10 is described.As shown in Figure 6, for example use a pair of mould that constitutes by fixed mould (former) and moveable die 62 (formpiston), form first box part 10 through die cast.At this moment, internal gear part 50 die cavity (cavity) that is inserted into mould carries out one-body molded (embedding moulding).
Second 61b of hole portion etc. that is provided with first 61a of hole portion of the outer surface side that forms surrounding wall portion 11 and forms the outer surface side of bearing holding part 13 at fixed mould 61.Fixed mould 61 is fixed, and with respect to fixed mould 61, moveable die 62 is at the direction sliding transfer of the center line S of mould.In addition, the center line S of mould is consistent with spin axis A.
Be provided with at moveable die 62: the casting core 62c of the column core 62b of the inner surface side of central core 62a, formation bolt hole 15 and the inner surface side of formation blowhole 16 etc.The profile of the base portion of central core 62a forms slightly littler than the internal diameter of gear part 51, so that can assembling gear portion 51.In the upper end of the base portion of central core 62a, be provided with the roughly the same contacting part 63 of internal diameter of external diameter and annular plate 53, so that contact with annular plate 53.In addition, at the end side of central core 62a, also be provided with the part of the inner surface side that forms axis hole 14 and bearing holding part 13 etc.
Internal gear part 50 is assemblied in the base portion of the central core 62a of moveable die 62 with the state of annular plate 53 sides towards the bottom side of fixed mould 61.Like this, the part of the ring tooth 51a of gear part 51 is blocked by annular plate 53 and moveable die 62.And shown in arrow, moveable die 62 enters into fixed mould 61, and is as shown in Figure 7, and both are bonded into one.Thus, formed the die cavity of reservation shape at mould inside.
Then, be pressed into the aluminum alloy of the high temperature of fusion, it is ejected in the die cavity from the inlet (not shown) of being located at fixed mould 61.At this moment, therefore the part of ring tooth 51a, can be prevented that aluminum alloy from entering into the part of ring tooth 51a by annular plate 53 obstructions such as grade.
After in die cavity, having injected enough aluminum alloys, solidify in order to make aluminum alloy, through putting the cold cooling processing of carrying out naturally.At this moment; Prevent that through casting core 62c and deformation portion 52 is adjusted to: for the volume of the die cavity at the part place on every side of internal gear part 50; Roughly homogeneous becomes; Therefore, the rate of cooling of the aluminum alloy around the internal gear part 50 at total measurement (volume) different at different position and different places such as limit portion, horn-like part 11a, heavy section 18 is roughly the same.Consequently, the deformation of aluminum alloy diminishes, and the deformation force unbalance that puts on internal gear part 50 alleviates, and therefore can improve the roundness of gear part 51 (ring tooth 51a).
(embodiment)
For the effect of confirming that the deformation portion of preventing brings; Making has been used the box part (comparative example) that does not have deformation to prevent the internal gear part of portion and used has the box part (embodiment) that deformation prevents the internal gear part of portion, and both roundness of ring tooth is compared.
About more employed box part and internal gear part, except deformation prevented having or not of portion, shape and forming method were identical with first box part 10 of above-mentioned mode of execution with internal gear part 50.The mensuration of roundness is under the same conditions, in the complete cycle scope pitch diameter (PCD) of ring tooth is measured at (end wall side) these three predetermined positions in the top of spin axis direction (opening side), central part and bottom for embodiment's article and comparative example article.
Fig. 8 representes the mensuration result of the PCD of comparative example.In the figure, the curve representation shown in the label S distribution of the PCD of (being untreated) before the embedding moulding.In addition, the phantom shown in the label 10 has been represented the box part outer profile corresponding with the PCD location.As shown in the drawing, to compare PCD and reduce to some extent after the moulding with before handling, it distributes, and deviation is big more towards the bottom side more.Particularly confirmed the PCD trend littler of limit portion side than the PCD of bight side.
Fig. 9 representes the mensuration result of embodiment's PCD.Among this figure, the curve shown in the label S is that untreated PCD distributes, and is the value roughly the same with comparative example.Under embodiment's situation, to compare with comparative example, the difference of the PCD before and after the moulding reduces.In addition, the deviation of the PCD at each position after the moulding also reduces, and can confirm that comparing roundness with comparative example increases substantially.
(other)
Mission case of the present invention is not limited to above-mentioned mode of execution, also comprises various structures in addition.
For example, be that the situation of circular cross-section is inferior at box part, shown in figure 10 when the shared volume of aluminum alloy around gear part 51 (internal gear 33) does not have under the situation of very big difference, can deformation be set and prevent portion 52 at internal gear part 50.
The sectional shape of box part is not limited to quadrilateral.For example, shown in Figure 11 (a), the sectional shape of first box part 10 (surrounding wall portion 11) also can be a pentagon etc., shown in Figure 11 (b), also can be that the cross section of a part is circle, and be provided with horn-like part in a part.In addition, though not shown, spin axis A also can be with respect to the eccentric configuration of box part.
In addition; In above-mentioned mode of execution; Show first box part 10 is shaped to one by surrounding wall portion 11 and the end wall 12 of stopping up the one of which end situation; But also can form parts suitable and the parts suitable respectively, constitute first box part 10 (with reference to Figure 12) through they are combined with end wall 12 with surrounding wall portion 11.In addition, the box part under this situation is a tubular.
In above-mentioned mode of execution, show the situation that moveable die is made up of a part, but moveable die can be made up of also a plurality of parts.In this case, owing to the glide direction with each part is provided with the casting core accordingly, therefore, the bearing of trend of blowhole 16 is not limited to the direction of center line S.For example, blowhole 16 can be along extending with the direction of center line S quadrature or with respect to the direction that center line S tilts.
Like this, blowhole 16 can also be like Figure 12 or the side depression that forms from surrounding wall portion 11 shown in Figure 13.
Non slip surface can also use a plurality of spot-like projections or more than one wire projection to constitute.Blowhole and deformation prevent that the shape of portion can be according to the suitably formation such as shape of box part.The deformation portion of preventing is also the same with annular plate, can be installed on internal gear later on.

Claims (9)

1. mission case, it comprises:
Box part, its surround sun gear and planetary around; And
Internal gear cylindraceous, it is fixed on the inboard of said box part with the spin axis state consistent with said sun gear,
Be provided with the inflow limitation part of the ring-type that the end than tooth leans out to the inside at an end of said internal gear,
Outer circumferential face at said internal gear is provided with antiskid part, is formed with more than one protuberance or recess in this antiskid part,
The moulding through die casting of said box part, said internal gear embed and take shape in said box part.
2. mission case according to claim 1, wherein,
Said box part has the outstanding horn-like part in cross section in the outside of the part that is fixed with said internal gear, this horn-like part extends along the spin axis direction,
Be provided with blowhole at said horn-like part and prevent portion with the deformation that occupies predetermined volume.
3. mission case according to claim 1, wherein,
Said inflow limitation part is made up of the circular parts that form with said internal gear split, is installed on said internal gear after the said inflow limitation part.
4. mission case according to claim 3, wherein,
Said box part has the outstanding horn-like part in cross section in the outside of the part that is fixed with said internal gear, this horn-like part extends along the spin axis direction,
Be provided with blowhole at said horn-like part and prevent portion with the deformation that occupies predetermined volume.
5. according to claim 1 or 4 described mission cases, wherein,
Said antiskid part is made up of the concaveconvex structure with the wire of spin axis almost parallel.
6. mission case according to claim 5, wherein,
Said box part has the outstanding horn-like part in cross section in the outside of the part that is fixed with said internal gear, this horn-like part extends along the spin axis direction,
Be provided with blowhole at said horn-like part and prevent portion with the deformation that occupies predetermined volume.
7. mission case according to claim 6, wherein,
Said deformation prevents that portion and said internal gear be arranged to one.
8. mission case according to claim 6, wherein,
Said blowhole extends along the spin axis direction,
End than said blowhole leans on inboard position, is provided with said deformation and prevents portion.
9. mission case according to claim 8, wherein,
Said deformation prevents that portion and said internal gear be arranged to one.
CN201210012740.8A 2011-01-17 2012-01-16 Mission case Expired - Fee Related CN102588561B (en)

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JP2011007038A JP5655580B2 (en) 2011-01-17 2011-01-17 Transmission case
JP2011-007038 2011-01-17

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TWI465656B (en) 2014-12-21

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