US1797105A - Motor brake - Google Patents

Description

March 17, 1931. A. w. sHoBLoM -1,797,105

` MoToR BRAKE Filed Aug.-v 21, 1928 INVENTOR wn'NEssEs -1 ./WShOZ'Zom. lv( BY 4 l ATTORNEY Patented Mar. 17, 1931 TAE AXEL w. srroBLoivr, or rniLIrsBURG, MONTANA MOTOR BRAKE Application led August 21, 1928.

rlhis invent-ion relates to brakes for trucks or automobiles of any kind, and particularly toa'n impro-ved motor brake, the object being to provide an attachment for part of the motor soas to utilize the pistons and cylinders as the braking structure for the automobile.

Another object of the invention is to provide a motorvbrake wherein means are provided for shifting the valve rocker arms of the 'engine 'so that the cams cannot cause the valve to function.

Another object, more specifically, is to provide `an attachment for the engine of automobiles wherein by the operation of a suitable lever near Athe drivers seat all of the valves or any portion thereof may be caused to only partly function or may be caused to cease functioning completely, and thereby convert the engine into a pneumatic brake structure.

1n the accompanying drawing,-

Figure 1 is a fragmentary view partly in Vsection showing a portion of an kengine with certain parts of the 'engine applied thereto; 44Figure 2 is a sectional view through Figure 1 on the line 2-2;

Figure 3 is a schematic view principally Vin elevation disclosing an embodiment of the invention.

Referring to the accompanying drawing by numerals, 1 indicates an engine which may be applied to a truck or other car and connected to the parts thereof in the usual manner. As is well known, the engine is Y connected to two or more of the wheels of the car for driving purposes. Where the valves of the -engine are held closed or partly closed and the fuel is turned olf or the spark is turned olf, the engine will act as a pneumatic brake for resisting rotation of the wheels with which it is connected` In the present invention the motor 1 is connected with the wheels of the car in the usual manner and ordinarily the motor functions in the usual manner. However, when going down a steep grade or a long grade the grip 2 of the lever 3 is grasped and the catch 4 is released from the ratchet 5 and then the Serial No. 301,043.

lever 3 is pulled to a desired extent for causing the valve 6 to open less and less.

The device is preferably applied to all of the valves, but in the accompanying drawing it is shown connected with only one valve. As shown in Figure 1, the valve 6 is urged toward its seat 7 by a spring 8 acting on thecylinder head 9 and on the abutment 10, said abutment being secured to the valve stem 11 in any desired manner.

As shown in Figure 1, the rocker arm 14 is provided with an enlargement or foot 13 for acting .on rod 11, whileat the opposite end the enlargement or foot 15 accommodates an adjusting screw 12 provided with a 65 suitable lock nut. .This adjusting screw cc` acts with the top of the cam rod 16, whereby a proper adjustment may be. secured while the rods 16 and 11, as well as the rocker arm 14 may properly function. rlhe cam 19 op- 7G erated by the usual cam shaft 2O acts to raise rod 16 at the proper time and thereby rock the rocker arm 14 for depressing valve `6 so as to admit an explosive mixture, if this valve is an intake valve, and to permit exhausting of the cylinder, if the valve should be an exhaust valve. The rocker arm '14 is pivotally supported on the pins 21 and 22 carried by the bifurcated end 23 of the sleeve 24. This sleeve is urged upwardly by a strong spring 25 which acts on the bifurcated end y23 and on the top of the cylinder head 9. The rocker arm 14 is provided with a comparatively large bore 26 and at the upper part adjacent bore 26 isA provided with a 85 rounded bearing surface 27 for receiving the plate 28. The plate 28 is provided with a rounded cam face 29 for receiving the cam 3() preferably formed integral with the arm 31. rlhe cam 30 is formed into two operating 90 cam sections 30 and 30 whereby a more uniform pressure and action is secured. Pins 32 and 33 are carried by the sections 30 and 30, said pins being screwed into a block 34'which has a threaded aperture for receiving the threaded end of the rod 36, which rod is screwed into the head 9 at 37. By reason of this structure whenever the arm 31 is in its raised position, as shown inV F ifrure 1, the action of rod 16 will have no effect 0n 1 the valve 6, and consequently, this valve will remain closed. By moving the arm 31 to :L substantially horizontal position cam sections and. 30 will depress the center of the rocker arm 14 against the action of spring 25 and then the parts are positioned to cause the engine to operate properly. lVhen the rocker arm 14 has been thus dcpressed rod 16 will rock arm 14 and cause the valve 6 to be opened, as shown in Figure 3. As shown in this figure, the arm 31 is pivotally connected at the outer end with link 38, which link in turn is pivotally connected to one end of the bell crank lever 39. lThe end of bell crank lever 39`is connected to the lower end of lever 3 by the link 41, whereby when the lever 3 is shifted, the rocker arm 14 is either forced downwardly or released so as to be raised by spring 25. Ordinarily, lever 3 is in the position shown in Figure 3 and rocker arm 14 is forced downwardly to its greatest extent. l/'Vhen the parts are in the position just mentioned the engine is functioning in the usual manner to propel the vehicle. When it is desired to use the engine as a brake, lever 3 is moved over a short distance to the right, as shown in Figure 3. This will swing arm 31 upwardly a short distance, and consequently valve 6 will remain closed longer than usual. 1f the braking action is not suiiicient under these conditions, lever 3 is moved over still further to the right (Figure l/Vhere it is desired to have the valve 6 remain closed continually, lever 3 is moved over to the right in Figure 3 to its extreme position, whereupon rocker arm 14 will be completely released, so that the rod 16 cannot move the rocker arm for opening valve 6. As heretofore mentioned, lever 3 could be connected with only one of the valves of the engine or with all of the valves or with any portion of the valves.

lWhat I claim is 1. A motor brake, comprising in combination with an internal combustion engine having a valve, a rocker arm for opening said valve when the rocker arm is moved in one direction, a spring for closing said valve and moving-the rocker arm in a reverse direction, means for resiliently land rockably supporting said rocker arm, a rod extending loosely through said means, and an arc-shaped cani pivotally mounted on said rod acting Vto releasably hold said rocker arm in an operative position.

2. In a motor brake, the combination with a motor having a valve and a valve operating rod, of a rocker arm positioned to be moved in one direction by said rod for opening said valve,` a spring for closing said valve and moving the rocker arm in the opposite direction, a resilient support for said rocker arm, a bifurcated arc-shaped rockable cam normally holding said support depressed and said rocker arm in an operative position, an

arm for moving said cam to a position whereb i said resilient support may move the rocker arm to an inoperative position.

3. In a motor brake, the combination with an ordinary internal combustion engine, of a resilient support for each of the rocker arms of the engine, a fixed rod extending through said support and the rocker arms, a cam pivotally mounted on the outer end of the rod positioned to move the rocker arms downwardly so that the mechanism of the engine will cause the same to function properly, and means for shifting said mechanism so that said rocker arm may move upwardly out of operative position.

4. i motor brake, comprising an internal combustion engine provided with the usual valves and means for operating the valves, said means including a rocker arm having an aperture extending therethrough centrally, resilient support for said rocker arm, a fixed rod extending through said support and rocker arm, a cam rotatably mounted on the outer end of said rod, said cam being positioned to move said rocker arm downwardly against the action of said resilient support when the cam is moved to a given position, and to release the rocker arm when the cam is moved to a second position, whereby said resilient support will move said rocker arm to an inoperative position.k

5. ln a motor brake, the combination with an internal combustionengine provided with the usual valves and other operating attachments including rocker arms, each of said rocker arms having an aperture extending therethrough, a stationary rod extending through said aperture, a support surrounding said rod and supporting said rocker arm, said support including a spring and a pivotally mounted cam connected with said rod and acting on said rocker arm, said spring acting to hold the rocker arm in an inoperative position and said cam functioning to move the rocker arm to an operating position when the cam has been moved to a given position.

6. In a motor brake, the combination with an internal combustion engine having the usual valves and other attachments, of a specially constructed rocker arm for operating the valves, said rocker arm having an aperture passing therethrough centrally and a bearing surface positioned in the aperture, a resilient support for the rocker arm, said support including a forked member, a pair of pins carried by said forked member loosely extending into said rocker arm for pivotally supporting the rocker arm, a stationary rod, extending through said support and the aperture in the rocker arm, and a cam for moving the rocker arm downwardly against the action of said spring.

7. In a motor brake, the combination with an internal combustion engine provided with the usual valves and other operating attachments, said engine being provided With a specially formed rocker arm for each Valve, each of said rocker arms having openings therein near the center, pins extending from said openings, and a bifurcated support carrying' said pins and straddling said rocker arm, a spring for resiliently supporting said support, and means including a cam for depressing said rocker arm against the action of said spring7 said rocker arm When depressed being positioned to function in the usual manner of rocker arms and when released by said cam being raised so as not to function.

AXEL W. SHOBLOM.

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