US1708749A - Cam and valve lifter - Google Patents

Description

A. J. ADAM 1,708,749

CAM AND VALVE LIFTER April 9, 1929.

5 Sheets-Sheet l Filed Feb. 21,, 1927 INVCN IQR ATTORNEY A ril 9, 1929. J D 1,708,749

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ATTOR N EY April 9, 1929. A. J. ADAM CAM AND VALVE LIFTER Filed Feb. 21, 1927 3 Sheets-Sheet INVENTOR ATTOR N EY .1. Jflziazra,

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latente d Apr. 9, 1929.

UNITED STATES ALEX J. ADAM, OF SAN ANTONIO, TEXAS.

CAM AND VALVE LIFTER,

Application filed February 21, 1927. Serial No. 170,018.

This invention relates to valve mechanisms for internal combustion engines, an object being to provide means tor simplitying the construction and operation and reducing the number of working parts of a mechanism of this character.

To this end the invention provides means for actuating a plurality ofvalves by a single cam or eccentric, novel means being pro vided for alternately acting upon the intake and exhaust valves of one or more cylinders.

With the above and other objects in view, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings and. pointed out in the appended claim.

In the drawings Figure 1 is a fragmentary scctionaiview illustrating the invention.

Figure 2 is an enlarged detail. sectional view" showing the valve lifter and contiguous portions of the mechanism illustrated in Figure 1.

Figure 3 is an elevation partly broken away showing the valves of a two-cylinder engine actuated by a single cam.

Figure 4 an elevation at right angles to Figure 3.

Figures 5 and 6 are side and edge views respectively of the cam shown in Figure 1.

Figures 7 and 8 are side and edge views respectively of acam for actuating a single valve.

Figures 9 and 10 ar side and edge views respectively of the cam shown in Figure Figure 11 is an edge view of the type of cani shown in Figures 5 and 6, the cam groove being replaced by a cam bead.

Figure 12 is a fragmentary view showing the end of a valve litter for use in connection with the cam shown in Figure 11.

Referring to the drawings 7 in detail wherein like characters of reference denote corresponding parts, the reference character 15 indicates the cylinder of an internal coinbustion engine having overhead valves 16, one of which is an intake and the other an exhaust valve. The engine crank shaft is shown at 17 and this shaft is provided with the usual crank arms 18 for connection with the rod 19 of a piston 20. i

As is usual in valve mechanisms of this character, the valves are normally seated by springs 21 and are engaged by rocker arms 22 which have connected thereto push .the hearing or guide 25.

Pivotally mounted within the slide 27 upon a pin 29 is a valve litter 30, so that the said lifter may be moved longitudinally within the sleeve and may also be moved. upon the pivot 29. The outer end oi? the valve lifter 30 bifurcated so as to provide spaced arms 31 and mounted between these arms is a roller or tracer 32. Secured up on the crank shaft 17 is a cam This cam wh.ich is shown in Figure 1 of the drawings is illustrated on an enlarged scale in Figures 5 and 6. As shown in these figures the cam includes oppositely located low portions 34; and similarly arranged high portions 35, while double groove 86 extends around the cam. Upon one side of the cam the double groove provides parallel grooves 37 as shown in F igure 1, while these double grooves cross upon the opposite side of the cam as shown at 38 in Figure 6.

As the cam is revolved by the rotation of the crank shaft, the wheel 32 will travel in the double cam groove 36 and when the parts are in the position shown in Figure 1, one of the rods 23 will be lifted to open its particular valve. As rotation of the cam continues, the wheel 32 will pass from the portion oi the groove shown in Figure 1 to the opposite portion, first permitting the valve to seat under the action of its spring 21. As the wheel passes to the opposite portion of the groove 36, the valve lifter will be moved upon its pivot so as to bring its inner end beneath the other push rod 23 and when the wheel reaches the high portion, of the cam, this push rod will be actuated to open the other valve.

The cam shown in Figure 11 is 01 the 1 till ill) from the cam illustrated in Figures 5 and 6 in that only one high point is provided, so that instead of actuating a valve at each half revolution, a single valve is actuated once in each complete revolution.

- In Figures 3 and 4, a two-cylinder engine is illustrated, each cylinder having upon opposite sides an intake valve and an exhaust valve. These valves are indicated at 41. der block is a rocker arm 4-2. This arm is mounted :for pivotal rocking movementlas shown at 4-3 and upon an arm lt and the latter is in turn pivotally mounted shown. at in a bracket 46. The rocker arm 42 is thus capable oi pivotal. rocking movement to actuate the valves and of lateral pivotal movement for the purpose of bringing its upper end into alternate engagement with the valves 41 upon one side of the block. For this purpose, the lower end of the rocker arm 42 has a universal connection 47 With a litter 48 which is mounted and movable after the manner of the lifter shown in Figure2 of the drawings. Like the lifter 30, the liiter 48 carries at its inner end a Wheel or roller 49 Which operates in a double cam groove 50 provided in a cam 51 which is mounted upon the crank shaft 52 oi? the engine. I

v As the cam 51 is revolved, the litter 48 Will be moved longitudinally and pivotally after the manner of the lifter 30 and this movement Will cause the rocker arm 42 to be Mounted upon each side of the cylin:

rocked upon its pivot 43 as Well as to be moved laterally upon the pivot 45. The

rocker arm Will thus be caused to alternately engage and actuate the valve upon one side oi the cylinder 'blocle As the mechanism duplicated upon opposite sides of the cylinder block shown in Figure 3 0f the drawings, an exhaust valve and an intake valve will be alternately operated in each cylinder ot the'engine by the action ofra single cam.

ne invention details of construction and the right is herein reserved to make such changes as properly lall Within the scope of the appended claim.

7 Having described the invention What is, claimed 1s:

In a valve mechanism for internal combustion engines, normally seated intake and exhaust valves, push rods operatively associated with the valves, a bearing sleeve, a'

ALEX J. ADAM.

is susceptible of variouschanges in its iorm, proportions and minor r lmigitudinally and pivotally and alter-

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