Valve driving mechanism for internal combustion engines

Abstract

The invention provides a valve driving mechanism for internal combustion engines, and the valve driving mechanism comprises a valve tappet, a valve stem, a spring upper seat, a spring bottom seat, two valve lock clamps and a valve guide pipe, wherein the valve tappet comprises a bearing part for bearing the valve stem, the bearing part is designed as a sliding chute, the sliding chute comprises a sliding-chute bottom surface and oppositely-arranged sliding-chute side walls; and one end of the valve stem is embedded in the sliding chute, one end (embedded in the sliding chute) of the valve stem comprises a contact part, the contact part is radially provided with a first through hole, each sliding-chute side wall is provided with a second through hole, and the contact part is fixed in the sliding chute by virtue of a connecting pin passing through the first through hole and the second through holes. According to the invention, because the valve stem and the valve tappet are respectively provided with the first through hole and the second through holes, and are connected by virtue of the connecting pin, when a valve spring fails, due to the connecting and fixing of the connecting pin, the valve stem is not separated from the valve tappet, therefore, the collision between the valve stem and a piston can be effectively avoided.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a valve transmission mechanism of the internal combustion engine. Background technique [0002] The function of the valve mechanism is to open and close the intake valve and exhaust valve regularly according to the working sequence and working process of the engine. The existing valve mechanism such as figure 1 As shown, the valve is in contact with the valve tappet 1 under the restoring force of the valve return spring, but when the valve return spring fails, it is easy to cause the valve to collide with the piston, which may lead to failure of the piston, cylinder and valve mechanism . On the other hand, the contact surface between the valve lifter 1 and the valve will sweep across the upper end surface of the entire valve. During the operation of the valve mechanism, according to the position of the contact surface, a figure 2 The working states of F1, F2, and F a...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem in the prior art that the valve lifter is separated from the valve caused by the failure of the spring, and then the valve collides with the piston to cause the failure of the valve mechanism, the present invention provides a device that can prevent the valve lifter from being separated from the valve and ensure that the valve valve train of an internal combustion engine in which the rod moves efficiently in the valve guide

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