SU34235A1 - Distribution mechanism for internal combustion engines with two exhaust valves - Google Patents

Description

This invention relates to distribution mechanisms for internal combustion engines with two exhaust valves lifted alternately from a roller rotating from the main shaft with a 1: 4 transmission.

In the proposed mechanism for raising the pushers of each exhaust valve on the distribution roller, two jaws of different heights are diametrically opposed, of which the lower one impacts the pusher only when there is a thickened part of the movable plate between them. The movement of the said plate is made once every four turns by the cam acting on the lever associated with the plate, the swing center of which is repositioned by the spindle in order to turn the mechanism on and off and transfer it to work with the lift valves simultaneously.

In FIG. 1 shows a front view of a distribution mechanism for internal combustion engines with two exhaust valves; FIG. 2 is a side view of it; FIG. 3 is a side view of a cam for a suction valve.

The distribution roller 4 rotates four times slower than the main shaft and therefore the gear 5 on the races (473)

The distribution roller 4 is four times larger than the gear 6 on the main shaft. The cam / P for the suction valve has two protrusions 20a and 206 (Figs. 1 and 3), the same in height and diametrically opposed, acting on the pusher / valve roller. For each of the tappets of the 2 exhaust valves, two cams 13a are mounted on the roller. and / Js, also diametrically located, but not at the same height. The lower cams 73a can lift the pushers of the 2 valves only when there is a thickened part 76 of the plate 7 between the cam and the pusher. When there is a thin part 7a of the plate 7 between the pusher and the cam, only the higher cam J3e can lift the pusher.

When it is desirable for the exhaust valve to work through three turns on the fourth, then thin part 7a of plate 7 should move between the pusher and the cam ;. while the other exhaust valve will also work through three turns on the fourth, but with a difference in the cycle of two turns.

If it is desirable that each of the two exhaust valves work through one turn, i.e., on a four-stroke cycle, then plate 7 must be moved to position 7a, and then back during each four-stroke cycle. Keep the plate in this position all the time so that a part of it is thick between the cam and the pusher, it is impossible, since the high cam would raise the pusher and the valve too high. Therefore, this plate receives a periodic movement, which is achieved with the help of a special cam 70, which can be mounted on the auxiliary roller or on that jke with the Simulator, and every two turns of the crankshaft act on the end 9 of the lever 8, and thus move plate 7. For the same, so that the auxiliary cam JO either retracts the lever 8 or does not retract, i.e. so that each of the exhaust valves acts either through “Four strokes or after eight strokes, the displacement of the swing center of the lever 8 reaches is carried out by moving the spindle 7 / by means of the worm J4 and the gears 72. With a larger extension of the spindle 77, the cam 10 will move the end of the P of the lever 8 and thus move the thin part 7a of the plate 7 to the 7af position.

When the same spindle 77 is pulled in by means of a J4 worm, the cam 70 is already

cannot affect the end i of the lever. To close the knob P to the cam-JO, and at the same time to protect the plate from moving from position 7 to position 7a, when this is not required, a spring 75 on the telescopic rod serves.

The subject matter of the invention.

A distribution mechanism for internal combustion engines with two exhaust valves lifted alternately from a roller rotating from the main shaft with a 1: 4 transmission, characterized in that for each exhaust valve two jaws, one J3e, higher, and another 75a, lower, which can affect: the valve 2 pusher is only Tot-yes, when there is a thickened part 76 of the plate between them, moved once every four turns by a JO cam mounted on on the same or additional distribution roller, by means of a lever 9, 8, the hitch of the pump is adjusted by the spindle 77 to switch on and off the mechanism and switch to work with raising both valves simultaneously.

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