CN101122332B

CN101122332B - Three function electric hammer gearbox and its assembly method

Info

Publication number: CN101122332B
Application number: CN2006101152153A
Authority: CN
Inventors: 李成道; 乐军
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-08-09
Filing date: 2006-08-09
Publication date: 2011-08-03
Anticipated expiration: 2026-08-09
Also published as: CN101122332A

Abstract

The invention discloses a three-functional electric hammer gear box (4) structure, which comprises an end cover (44), an intermediate shaft (42) connected with a motor (3), an output shaft (43) used to drive a working head (1), a rotation stop block (46) used to lock the output shaft and prevent the shaft from rotating, and a gear box casing (41) to contain a first shaft, a second shaft and the rotation stop block. The intermediate shaft is equipped with a first meshing part (422) with external teeth. The output shaft is equipped with a second meshing part (432) with external teeth. The second meshing part cooperates with the rotation stop block optionally. The end cover is connected with a pin (47), and the rotation stop block is arranged on the pin. The gear box is easy in both the manufacture and assembling.

Description

Three function electric hammer gearbox and assembling method thereof

Technical field

The present invention relates to a kind of electric hammer gearbox with output shaft rotation prevention structure.

The invention still further relates to a kind of assembling and have the method for the electric hammer gearbox of output shaft rotation prevention structure.

Background technique

U.S. Pat 6,109, disclosed a kind of three function electric hammer gearbox No. 364, this electric hammer gearbox comprises a spline pawl, when knob rotates to simple hammering shelves, the gear ring of being located on the output shaft can driven moving axially with the spline pawl mesh, this spline pawl is in the gear box casing the inside by screw, thereby make output shaft not rotatable with respect to gear box casing, because it is deep that gear box casing is often done, so the spline pawl will be fixed on the gear box casing the inside, operating can be very inconvenient.In addition, owing to will pass through screw, so will process screw hole in advance on the gear box casing, the processing screw hole is very inconvenient on darker gear box casing.

Summary of the invention

Technical problem to be solved by this invention provides a kind of easy processing, and the electric hammer gearbox structure that is easy to assemble.

Another technical problem that will solve of the present invention provides a kind of method of easy assembling electric hammer gearbox.

For electric hammer gearbox structure of the present invention, the technological scheme that addresses the above problem is: a kind of electric hammer gearbox, comprise: end cap, the jack shaft that is connected with motor, be used to drive the output shaft of working head, be used to pin the spline piece that output shaft prevents its rotation, be used to accommodate the gear box casing of described jack shaft, output shaft and spline piece, jack shaft is provided with first engaging member of band external tooth, output shaft is provided with second engaging member of band external tooth, second engaging member is selectable to be cooperated with the spline piece, is connected with pin on the described end cap, and described spline piece is installed on this pin.

Method for assembling electric hammer gearbox of the present invention, the technological scheme that addresses the above problem is: earlier pin is connected on the end cap, then the spline piece is installed on the pin, again gear box casing is placed in the outside of jack shaft, output shaft and spline piece and gear box casing is cooperated with end cap, thereby make that the spline piece is non-rotatable with respect to housing.

For above-mentioned electric hammer gearbox structure and assembling method thereof and since the spline piece be installed on pin that end cap is connected on, in the assembling process, pin and end cap normally directly are exposed to the outside, thereby can make and assemble than being easier to.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is disclosed three function electric hammer overall structure floor map;

Fig. 2 is the three-dimensional exploded view of three function electric hammer gearbox shown in Fig. 1;

Fig. 3 is the switching member that disclosed among Fig. 2 stereogram from another angle;

Fig. 4 is the stereogram of the gear box casing that disclosed among Fig. 2;

Fig. 5 is the disclosed internal structure schematic representation of three function electric hammer when the hammer drill shelves;

Fig. 6 is the disclosed internal structure schematic representation of three function electric hammer when pure seeking loopholes;

The internal structure schematic representation that Fig. 7 is disclosed three function electric hammer when pure hammer shelves;

Fig. 8 be Fig. 7 along A-A to sectional view;

Among the figure:

1. working head 2. chucks 3. motors

31. motor shaft front end gear 4. gear-boxes 5. handles

6. switch 41. gear box casings 410. host cavities

411. the first projection 411a., first standstill face, 412. second projections

412a. second standstill face, 42. jack shafts, 421. intermediate gears

422. front end small gear 43. output shafts 431. rams

432. slip gear ring 44. end caps 441. first mounting holes

442. second mounting hole 443. the 3rd mounting hole, 45. switching members

451. knob 452. shift forks 453. shift fork main bodys

454. first shifting block, 455. second shifting blocks, 456. pin-and-holes

457. skewed slot 458. eccentric pins 46. spline pieces

461. stage clip 462. spline external tooths 463. first fixture blocks

463a. first catch surface, 464. second fixture block 464a., second catch surface

47. sell 471. link stoppers, 48. clutches

481. 483. spline housings, 482. second external splines portions of the first external splines portion

49. Oscillating lever bearing

Embodiment

Referring to Fig. 1, the present invention has disclosed a kind of three function electric hammer 100, this three function electric hammer can be at pure hammer shelves, hammer drill shelves and pure seeking loopholes are switched between three kinds of functions, and this three function electric hammer 100 comprises: working head 1 is used for the chuck 2 of clamping working head 1, be used for driving the motor 3 of working head 1, gear-box 4 between motor 3 and chuck 2 is used for the handle 5 that the operator holds during work, be arranged to be used for controlling described motor 3 on the handle 5 and to make its work or out-of-work switching element 6.

As shown in Figure 2, gear-box 4 comprises: gear box casing 41, be connected with motor shaft and be subjected to the shaft-driven jack shaft 42 of motor, the output shaft 43 that is used to drive working head 1 that is connected with jack shaft 42, be used to drive the switching member 45 that electric hammer 100 switches between above-mentioned three kinds of functions, that fixedly connected with described gear box casing 41 and be used to support the gear-box end cap 44 of described jack shaft 42 and output shaft 43, be fixedly connected on the pin 47 on the gear-box end cap 44, pin is the axially movable spline piece 46 that is equipped with on 47, pin 47 ends away from end cap are provided with link stopper 471, spline piece 46 and link stopper 471 between be provided with compressible stage clip 461, one end of stage clip 461 is against living spline piece 46, and the other end is against living link stopper 471.

Jack shaft 42 is provided with intermediate gear 421, this

intermediate gear

421 and 31 engagements of motor shaft front end gear, make that just can drive this jack shaft 42 when motor shaft rotates rotates, make the motor shaft high rotational speed be lowered simultaneously, the front end of jack shaft 42 is provided with front end small gear 422, is provided with clutch 48 and Oscillating lever bearing 49 between front end small gear 422 on the jack shaft 42 and intermediate gear 421 successively.The end of output shaft 43 is provided with the ram 431 that is connected with described Oscillating lever bearing 49, also is provided with the gear ring 432 that can slide in axial sliding on the output shaft 43.

End cap 44 is provided with first mounting hole, 441, the second mounting holes 442 and the 3rd mounting hole 443.This first mounting hole 441 is used for accommodating pin 47, the second mounting holes 442 and is used for accommodating described jack shaft 42, the three accepting holes 443 and is used for accommodating described output shaft 43.Pin 47 also can be one-body molded with end cap 44.Switching member 45 is used for driving slip gear ring 432 moves axially it.Switching member 45 comprises knob 451 and shift fork 452.Described knob 451 is installed on the outside of gear box casing 41, and described shift fork 452 is installed on the pin 47, and can move axially along pin 47.

With reference to Fig. 3, knob 451 is provided with eccentric pin 458.Shift fork 452 comprises shift fork main body 453, the first shifting blocks 454 and second shifting block 455.Two holes 456 that are provided with corresponding on the shift fork main body 453 are used for accommodating pin 47, shift fork 452 axially movable being installed on the pin 47.First shifting block 454 and the roughly L-shaped distribution of second shifting block 455.First shifting block is provided with skewed slot 457, and this skewed slot 457 is used for accommodating described eccentric pin 458, and described skewed slot 457 is the angle setting with vertical direction.Skewed slot 457 is set herein can makes when rotary knob 451 to 90 is spent respectively clockwise and counterclockwise, can be so that the stroke that described first shifting block 454 and second shifting block 455 move to both sides along pin 47 can be inequality.First shifting block, 454 next-door neighbour's slip gear rings, 432 1 sides are used to stir slip gear ring 432 it are moved axially along output shaft 43, and second shifting block, 455 next-door neighbour's clutches 48 are used to stir clutch 48 and make it be in engagement or disengaged condition.Spline piece 46 is along being circumferentially with one section spline external tooth 462, the initial sum termination of this section spline external tooth radially outwards outstanding be provided with one first fixture block 463 and one second fixture block 464, this first fixture block 463 and second fixture block 464 have one first catch surface 463a and one second catch surface 464a respectively.

With reference to Fig. 4, gear box casing 41 has a cavity 410 and is used for accommodating described jack shaft 42, output shaft 43 and sell 47.On these gear box casing 41 inwalls, be provided with two radially inwardly outstanding first projection 411 and second projections 412, this first projection 411 and second projection 412 have the first standstill face 411a and the second standstill face 412a respectively, the described first and

second standstill face

411a, 412a respectively with the first and second catch surface 463a that are located on the spline piece 46, thereby 464a cooperates and to make spline piece 46 non-rotatable with respect to gear box casing 41.

With reference to Fig. 5, clutch 48 comprises the first external splines portion 481 of fixedlying connected with jack shaft 42, the second external splines portion 482 of fixedlying connected with Oscillating lever bearing 49 and can be along the spline housing 483 of the axially movable band internal spline of jack shaft.When knob 451 during, motor shaft front end gear 31 and intermediate gear 421 engagements of being located on the jack shaft 42, be located at the front end small gear 422 and slip gear ring 432 engagements of being located on the output shaft 43 of jack shaft 42 front ends in the neutral position.The spline housing 483 of band internal spline and the first external splines portion 481 and the second external splines portion 482 mesh simultaneously, and this moment, clutch was in engagement.Can drive jack shaft 42 when motor shaft rotates rotates, jack shaft 42 rotates can drive output shaft 43 rotations on the one hand, effect by clutch 48 can drive Oscillating lever bearing 49 axial reciprocally swingings on the other hand, thereby Oscillating lever bearing 49 drives ram 431 axially reciprocatings, and this moment, three function electric hammer 100 was in the hammer drill pattern.

With reference to Fig. 6, the spline housing 483 that can promote the band internal spline of clutch when knob 451, the second shifting blocks 455 that turn clockwise moves axially, and makes the spline housing 483 and the first external splines portion 481 throw off, and this moment, clutch 48 was in disengaged condition.Motor shaft front end gear 31 and intermediate gear 421 engagements of being located on the jack shaft 42, front end small gear 422 on the jack shaft 42 and slip gear ring 432 engagements of being located on the output shaft 43.Can drive jack shaft 42 when motor shaft rotates rotates, jack shaft 42 rotates and can drive output shaft 43 rotations, because this moment, clutch 48 was in disengaged condition, so jack shaft 42 rotates and can't drive Oscillating lever bearing 49 axial reciprocally swingings, thereby ram 431 can not done axially reciprocating yet, and this moment, three function electric hammer 100 was in pure drill jig formula.

With reference to Fig. 7 and 8, when being rotated counterclockwise knob 451, first shifting block 454 can promote 432 axial motions of slip gear ring, make slip gear ring 432 and the front end small gear 422 on the jack shaft 42 throw off, the apical tooth phenomenon takes place when slip gear ring 432 axial motions to its increment contacts with the increment of spline piece 46, continue rotary knob 451, slip gear ring 432 can promote spline piece 46 and move axially together, the stage clip 461 that is positioned at spline piece 46 1 sides is compressed until knob and is rotated to 90 degree, slip gear ring 432 that start rear output shaft 43 fine rotation can make and 46 engagements of spline piece.At this moment, motor shaft front end gear 31 and center tooth 421 engagements of being located on the jack shaft 42, clutch 48 is in engagement.Can drive jack shaft 42 when motor shaft rotates rotates, under clutch 48 effects, the rotation of jack shaft 42 can make the Oscillating lever bearing 49 axial reciprocally swingings that are mounted thereon, thereby Oscillating lever bearing 49 drives ram 431 axially reciprocatings, this moment is because output shaft 43 and 46 engagements of spline piece, spline piece 46 is not rotatable with respect to gear box casing 41, thereby output shaft 43 is not rotatable with respect to gear box casing 41, be that output shaft 43 is lockable and does not change, this moment, three function electric hammer 100 was in pure hammer pattern.

During assembling, insert in the 3rd mounting hole 443 on the end cap 44 end that will have an output shaft 43 of slip gear ring 432 and ram 431, to be provided with intermediate gear 421, front end small gear 422, in second mounting hole 442 that jack shaft 42 insertion ends of clutch 48 and Oscillating lever bearing 49 cover, spline piece 46 is installed on the pin 47, the pin 47 that will have spline piece 46 and shift fork 452 inserts in first mounting hole 441, then gear box casing 41 is set in described output shaft 43, jack shaft 42 and sell 47 outside and make the first and second catch surface 463a on the spline piece 46,464a and the first and second standstill face 411a that are located on gear box casing 41 inwalls, 412a cooperates, at last knob 451 is installed on the outside of gear box casing 41, gear-box end cap 44 and gear box casing 41 are cooperated by screw.

Claims

1. an electric hammer gearbox (4), comprise: end cap (44), the jack shaft (42) that is connected with motor (3), be used to drive the output shaft (43) of working head (1), be used to pin the spline piece (46) that output shaft (43) prevents its rotation, be used to accommodate described jack shaft (42), the gear box casing (41) of output shaft (43) and spline piece (46), jack shaft (42) is provided with first engaging member (422) of band external tooth, output shaft (43) is provided with second engaging member (432) of band external tooth, second engaging member (432) is selectable to be cooperated with spline piece (46), it is characterized in that: be connected with pin (47) on the described end cap (44), described spline piece (46) is installed on this pin (47).

2. electric hammer gearbox according to claim 1 (4), it is characterized in that: described second engaging member (432) movably is positioned at the primary importance or the second place, when second engaging member (432) when being positioned at primary importance, second engaging member (432) cooperates with first engaging member (422) makes output shaft (43) rotatable, when this second engaging member (432) when being positioned at the second place, second engaging member (432) cooperates with spline piece (46), makes output shaft (43) be lockable non-rotatable.

3. according to the electric hammer gearbox (4) described in claim 1 or 2, it is characterized in that: described end cap (44) is provided with hole (441), and described pin (47) loose fit is in hole (441).

4. according to the electric hammer gearbox (4) described in claim 1 or 2, it is characterized in that: described end cap (44) is provided with hole (441), and described pin (47) tightly fits in the hole (441).

5. according to the electric hammer gearbox (4) described in claim 1 or 2, it is characterized in that: described end cap (44) is one-body molded with described pin (47).

6. electric hammer gearbox according to claim 3 (4), it is characterized in that: described spline piece (46) is provided with catch surface (463a, 464a), described gear box casing is provided with standstill face (411a on (41) accordingly, 412a), match can be so that spline piece (46) be rotatable with respect to gear box casing (41) described catch surface and standstill face.

7. electric hammer gearbox according to claim 6 (4), it is characterized in that: elastic element (461) is installed on the described pin (47), one end of this elastic element (461) props up spline piece (46), and the other end props up to be located on the link stopper (471) of pin away from the end of end cap.

8. electric hammer gearbox according to claim 3 (4), it is characterized in that: described electric hammer gearbox comprises switching member (45), this switching member (45) makes described second engaging member (432) and selectable cooperation of described spline piece (46), and this switching member (45) comprises and is installed on the outside knob (451) of described gear box casing (41) and is installed on shift fork (452) on the described pin (47).

9. electric hammer gearbox according to claim 8 (4) is characterized in that: described knob (451) is provided with eccentric pin (458), and described shift fork (452) is provided with skewed slot (457) and is used for accommodating described eccentric pin (458).

10. method of assembling the electric hammer gearbox (4) in the claim 1, it is characterized in that: will sell (47) earlier and be connected on the end cap (44), then spline piece (46) is installed on the pin (47), gear box casing (41) is placed in the outside of jack shaft (42), output shaft (43) and spline piece (46) again and gear box casing (41) is cooperated with end cap (44), spline piece (46) is non-rotatable with respect to gear box casing (41).

11. the method for assembling electric hammer gearbox according to claim 10 (4) is characterized in that: described pin (47) is shaped on the described end cap (44).

12. the method for assembling electric hammer gearbox according to claim 10 (4) is characterized in that: described end cap is provided with mounting hole (441), will sell (47) and be connected in and be meant on the end cap (44) in the mounting hole of pin loose fit on described end cap.