Internal combustion engine variable valve timing mechanism with simple structure

Abstract

The invention relates to an internal combustion engine variable valve timing mechanism with a simple structure. A scheme 1, a stepping motor drives a slide sleeve I to move rightward through a threaded shaft of the stepping motor, the slide sleeve I pushes a slide sleeve II to move rightward through a single-direction thrust ball bearing, and a return spring is compressed, in this process, a helical tooth external spline of the slide sleeve II and a helical internal spline of a chain wheel interact each other to allow a camshaft to rotate clockwise relative to the chain wheel (left view); and in this time, the stepping motor rotates in reverse, and then drives the slide sleeve I to move leftward through the thread shaft of the stepping motor, the slide sleeve II moves leftward under the action of the return spring, and in this process, the helical tooth external spline of the slide sleeve II and the helical internal spline of a chain wheel interact each other to allow the camshaft to rotate counterclockwise relative to the chain wheel (left view). differences between a scheme 2 and the scheme 1 are that an shaft end of a bevel gear central shaft is a straight tooth external spline, a slide sleeve IV is a straight tooth internal spline and a helical tooth external spline, an air inlet raised disk is a helical tooth internal spline, and an air discharging raised disk is a straight internal spline.

Description

technical field [0001] The invention relates to a variable valve timing mechanism of an internal combustion engine. Background technique [0002] At present, the structure of the known variable valve timing mechanism for internal combustion engines is all more complicated, and needs the support of the hydraulic system. Figure 5-6 0) as an example, it can be seen that its structure is relatively complex and requires hydraulic system support. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the structure of the existing internal combustion engine variable valve timing mechanism is relatively complex and needs the support of the hydraulic system, and to provide a variable valve timing mechanism with a simple structure, which is different from the variable valve timing mechanism without variable valve timing. Compared with the time mechanism, it only needs to add a stepper motor, a sliding sleeve I (or III), a one-way thrust...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the structure of the existing internal combustion engine variable valve timing mechanism is relatively complex and needs the support of the hydraulic system, and to provide a variable valve timing mechanism with a simple structure, which is different from the variable valve timing mechanism without variable valve timing. Compared with the time mechanism, it only needs to add a stepper motor, a sliding sleeve I (or III), a one-way thrust ball bearing, a sliding sleeve II (or IV), a return spring and an end cover I (or II) (excluding standard parts), the same kinetic energy of the existing variable valve timing mechanism can be achieved

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