US1885796A - Valve operating mechanism - Google Patents

Description

Nov. 1, 1932. B L'ET 1,885,796

VALVE OPERAT I NG MECHANI SM Filed Feb. 9. 1931 Patented Nov. 1, 1932 I I l p 1 GEORGES BOULET, OF SEVRES, FRANCE VALVE OPERATING MECHANISM Application filed February 9', 1931, Serial No. 514,360, and in France February 15 1930.

My invention relates to valve operating According to my invention two rocker mechanisms in which one or several inlet (or arms 11 and 12 are interposedbetween camexhaust) valves are operated through tWO shafts 9, l and plates 5, 6. Rocker arm 11 separate camshafts adapted to be angularly consists of two levers 11, 11 pivotally .displaced one with respect to the other, while mounted on a support 13 about an axis 1 1 5 the engine is running, so asto modify the and resting through two projections 15 on length of admission .(or of exhaust). 7 plate 6., Rocker arm 12 is pivotally mount- According to my invention, each camed on a support 16 about an axis 17 and rests shaft acts on the corresponding valve through through a projection '18 on plate 5. In their 10 a rocker arm which is mechanically connectintermediate part, levers 11, 11 are con- 60 ed to the rocker arm driven by the other camnected through a pin 19 passing, with a cershaft, in such manner that each cam may'protain lateral play,through aslot 20 of rocker duce always the substantially simultaneous arm 12-. opening of both valves. When cam 22 of shaft 10 acts upon rocker 5 In the particular case of a cylinder comarm 11, it causes the latter to rotate about 65 prising but a single inlet (or exhaust) valve, axis 14, and projection 15 presses'down valve" both rocker arms act on said common valve so 4. At the same time, pin 19 causes rocker that the latter may be operated through both arm 12 to rotate about axis 17, which is made cam-shafts. possible by the lateral play of. said pin in slot These arrangements are advantageously 20, and projection 18 presses down valve 3. 70 applied in particular with aircraft engines, It will be seenthat each camshaft thus opwhen the two cam-shafts can be both angucrates the two valves either simultaneously. larly displaced in opposite directions, while or with a small lag if pin 19 is given a slight V the engine is running, so that restricted in vertical play in slot 20. Obviously, cam 21 25 duction, in particular when the engine is runof cam-shaft 9 acts in the same manner on the 75 ning in the vicinity of the ground, may be valves through the-intermediary ofthe two accompanied with a late closing of the exrocker arms. haust, producing a reintroduction of the It results therefrom that, whatever the burnt gases into the engine, in greater or less angular relative positions of the tWo camquantity. shafts may be, each of them produces the si- 30 Said arrangements also apply to the remultaneous opening of the two valves, and versing of the direction of rotation of interthat throughvery simple and strong means. nal combustion engines as it will'be herein- It will also be-noticed that projections 15 and after explained. V 18 always act substantially in the direction A preferred embodiment of my device will of the axes of the valve stems, which permits be described with reference to the, appended an easy guiding and prevents jamming. Furdraudng, given merely by way of example, thermore, the displacements of said projecand in which: y tions on plates 5, 6 arejvery small, which re Fig. 1 is a vertical section along the line duces wear to a minimum] If one of the 40 1-1 of Fig. 2 through the two inlet (or excam-shafts is stopped, the other however haust) valves of an internal combustion enkeeps operating the two valves. gine cylinder; and If the cylinder was provided with a single Fig. 2 is a corresponding plan view. inlet (or exhaust) v valve, the arrangement In said drawing, 1 designates the cylinder would be modified in such manner that the head, 2 is the inlet (or exhaust) pipe. 3, 4 two projections 15, 18, disposed'along the are two inlet (or exhaust) valves, the stems of axis of the single valve, may act on the plate which are provided at their upper ends with of the latter. A mechanical connection beplates 5, 6 respectively, against which bear tween the two rocker arms would no longer springs 7 and 8. The valves are driven be quite necessary, but it might however be 00 through two parallel cam-shafts 9,10. kept in'order to avoid loose motion ofone rocker arm when the valve is pressed down by the other rocker arm.

As above mentioned this'arrangement permits reintroduction of the burnt gases into the cylinder when induction is restricted. In that case the two cam-shafts 9, 10 are so disposed as to be angularly displa-ceable, with respect to each other, in opposite directions, for instance by connecting said cam-shafts totheir driving shaft 21,011 which is keyed a pinion 24 through pinions 22, 23 adapted to slide under the action of fork members 27, 28' and provided with suitable arrangement of helical grooves cooperating with corresponding helical flutes 25, 26 of the cam-.

shafts.

This arran ement is alsosuitable as reversing gear for internal combustion engines.

Obviously the mechanical connection between the two rocker arms'couldbe of any other suitable type. Likewise, the cam could act on any point of the corresponding rocker arm. Generally speaking, while I have disclosed what I deem tov be the preferred embodiment of my device, it should be understood that 1 do not wish to be limited thereto as there might be'changes made in the arrangement disposition and shape of the parts without departing from the principle of my invention as comprehended within the scope of the appended claims.

What I claim is: V

l. A valve operating mechanism for internal combustion engines comprising in combination two separate cam-shafts, two rocker arms adapted to cooperate with said camshafts respectively, and means for mechani- .cally connecting said rocker arms to each other, whereby rotation of one rocker arm by the corresponding cam-shaft will produce rotation of the other rocker arm through said mechanical connecting means.

2. Valve operating mechanism for internal combustion engines comprising in combination two separate cam-shafts, two rocker arms adaptedto cooperatewith said cam- GEORGES BOULET.

shafts respectively, one of said rocker arms being provided with an elongated longitudinal slot, a pin projecting from the other arm adapted to engage said slot, whereby rotation of one rocker arm by the corresponding camshaft will produce rotation of the other rocker arm through said pin and slot connection.

3. Valve operating mechanism for internal combustion engines having two valves adapted to be both operated during the same stroke, which comprises two separate camshafts adapted to be angularly displaced respectively to each otherwhile the engine is running, a rocker arm pivot-allymount-ed on one side of these two cam-shafts, and pro vided with an elongated slot longitudinally disposed in its intermediate part, a projec .tionat the free end of said arm adapted to cooperate with one valve, another rocker arm

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