CN2556368Y

CN2556368Y - Valve actuating mechanism of engine with integral mechanical tappet

Info

Publication number: CN2556368Y
Application number: CN02275698U
Authority: CN
Inventors: 徐小刚; 魏常坤; 唐斌; 杨柏林; 李志祥
Original assignee: Changan Automobile Group Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2002-07-11
Filing date: 2002-07-11
Publication date: 2003-06-18
Anticipated expiration: 2012-07-11

Abstract

The utility model relates to an engine valve actuating mechanism with a monolithic mechanical tappet, comprising a cylinder head, a cam, a camshaft, the mechanical tappet, a valve, a valve stem and a valve spring; the mechanical tappet is a barrel-shape; a spacer in a prior valve actuating mechanism with a spacer-regulating type mechanical tappet is cancelled; while a boss is arranged by an integral forming in the center of an inner cavity of the mechanical tappet and retained directly against the top of the valve stem; the thickness of the boss is equivalent to the prior spacer; that is to say, the tappet is changed into the integral type and also capable of adjusting a clearance of the valve and guaranteeing a normal work of the engine. Thus for the structure of the utility model, the quantity of an original structural member is decreased; the processing difficulty is reduced; the quality is easier to be guaranteed; and the cost is lowered too.

Description

Engine valve actuating mechanism with integrated type machinery tappet

Technical field

The utility model belongs to motor car engine distribution device control technique field, is specifically related to a kind of engine valve actuating mechanism with integrated type machinery tappet.

Technical background

For overhead camshaft (OHC) motor, valve tappet is used for comparing with rocking arm type in the distribution device that cam directly drives more, and the advantage of this form is that the rigidity from the cam to the valve is big, and the kinetic characteristic of valve mechanism is good.The adjustment of valve clearance mainly contains dual mode, and promptly machinery is adjusted and adjusted automatically, and machinery adjustment is divided into bolt adjustment and pad adjustment again.The mechanical tappet number of spare parts that pad is adjusted is many, and difficulty of processing is big, causes the quality instability, and cost is also higher relatively.

Summary of the invention

The utility model at existing adopt mechanical tappet the deficiency that exists of engine valve actuating mechanism, purpose is to provide a kind of engine valve actuating mechanism with integrated type machinery tappet, guaranteeing that engine valve clearance simultaneously accurately, improve the shortcoming that mechanical tappet number of spare parts is many, difficulty of processing is big that original pad is adjusted, make it be easier to keep steady quality, reduce the cost.

Engine valve actuating mechanism with integrated type machinery tappet, comprise cylinder head, cam, camshaft, mechanical tappet, valve, valve stem and valve spring, it is characterized in that mechanical tappet is barrel-shaped, its lumen centers is one-body molded a boss, directly and the valve stem top offset.

In present technique, cancelled the pad in original pad regulating type machinery tappet distribution device, replace is with the one-body molded boss of the lumen centers of mechanical tappet, its thickness is equivalent to the thickness of original pad, be that tappet has become integrated type, can reach adjustment equally, guarantee the proper functioning running of motor the valve clearance.Therefore this structure decrease the number of spare parts of original structure, reduced difficulty of processing, easier ensuring the quality of products reduces cost,

Description of drawings

Fig. 1 is the structural representation of this distribution device;

Fig. 2 is the structural drawing of integrated type machinery tappet.

Embodiment

Referring to Fig. 1 and Fig. 2, have the engine valve actuating mechanism of integrated type machinery tappet, it is furnished with valve 1, valve stem 2 and valve spring 4 in cylinder head 3, and integrated type machinery tappet 5 is arranged in the special hole of cylinder head 3.Integrated type machinery tappet 5 is barrel-shaped design, is buckled in valve stem 2 tops, and its lumen centers has a boss 8, and direct and valve stem 2 tops offset.Cam 6 is arranged on the camshaft 7, and cam 6 contacts with the end face of integrated type machinery tappet 5, directly drives valve 1 and opens and closes.In order to prevent concentrated wear, should make during design about the axis and the eccentric 0.5-3mm of cam 6 width symmetry plane of integrated type machinery tappet 5, rotate to force integrated type machinery tappet 5.When determining external diameter, must guarantee that the integrated type machinery tappet 5 and the point of contact of cam 6 do not drop on outside the circumference of integrated type machinery tappet 5.Simultaneously, because cam 6 and the moment of valve 1 will cause the side pressure of integrated type machinery tappet 5,, be stuck avoiding so integrated type machinery tappet 5 has certain length.

Claims

1, the engine valve actuating mechanism that has integrated type machinery tappet, comprise cylinder head, cam, camshaft, mechanical tappet, valve, valve stem and valve spring, it is characterized in that mechanical tappet is barrel-shaped, its lumen centers is one-body molded a boss, directly and valve stem offset.

2, the engine valve actuating mechanism with integrated type machinery tappet according to claim 1 is characterized in that the axis and cam width symmetry plane off-centre 0.5-3mm of mechanical tappet.