CN207093166U - Cotter seat - Google Patents

Abstract

The utility model discloses a kind of cotter seat, including spring base body, spring base body has top surface and valve port, the edge of the middle part protrusion top surface of top surface forms annular protrusion, the interior edge of annular protrusion to the edge of valve port is in pit, and pit is used for stepping down to the valve limited block on rocker head.The cotter seat can effectively avoid the interference between cotter seat and rocking arm in the case of dimension overproof.

Description

Cotter seat

Technical field

Engine valve actuating mechanism is the utility model is related to, more particularly to a kind of cotter seat.

Background technology

At present, certain distance between valve and cotter seat be present in engine valve actuating mechanism, this distance is 0 Or during negative value, cotter seat can interfere with rocking arm, abnormal sound is produced, engine power decline etc. occurs for serious meeting.Especially It is the engine that hydraulic lash adjuster is used in camshaft overhead type, such as the riding vehicle diesel engine of certain small-power, The valve spring holder structure of design, top surface are substantially a plane.In the limiting case, the gas of riding vehicle diesel engine Gap meeting very little between door spring base and rocking arm, can interfere phenomenon when dimension overproof be present.

The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form Technology.

Utility model content

The purpose of this utility model is to provide a kind of cotter seat, can effectively avoided in the case of dimension overproof Interference between cotter seat and rocking arm.

To achieve the above object, the utility model provides a kind of cotter seat, including spring base body, spring base sheet Body has a top surface and valve port, and the edge of the middle part protrusion top surface of top surface forms annular protrusion, annular protrusion it is interior Along being in pit to the edge of valve port, pit is used for stepping down to the valve limited block on rocker head.

Preferably, the depth of pit is 1-3mm.

Preferably, pit is toroid, and the external diameter of toroid is the 2/3 of top surface external diameter.

Preferably, the joining place at the edge of pit and valve port has chamfering.

Preferably, valve port is bellmouth.

Compared with prior art, the utility model has the advantages that：By the top surface for changing existing spring base Structure, there is provided a kind of top surface middle part protrusion top surface edge formed annular protrusion spring base, annular protrusion Interior edge to the edge of valve port be in pit, the pit can step down to the valve limited block on rocker head, can solve rocking arm Body and interference problem of the cotter seat in mismachining tolerance and dimensional discrepancy.

Brief description of the drawings

Fig. 1 is the schematic cross-sectional view according to cotter seat of the present utility model；

Fig. 2 is the assembling schematic diagram according to cotter seat of the present utility model.

Embodiment

Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality New protection domain is not limited by embodiment.

Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members Part or other parts.

As shown in Figure 1 to Figure 2, according to a kind of cotter seat of the utility model embodiment, including spring base Body 1, spring base body 1 have top surface 11 and valve port 15, the edge shape of the middle part protrusion top surface 11 of top surface 11 Convex portion 12 is circularized, interior edge to the edge of valve port 15 of annular protrusion 12 is in pit 13, and pit 13 is used on rocker head 3 Valve limited block 31 is stepped down (referring to Fig. 2).

In such scheme, a kind of structure of the top surface 11 by changing existing spring base, there is provided pars intermedia of top surface 11 The edge of position protrusion top surface 11 forms the spring base of annular protrusion 12, the interior edge of annular protrusion 12 to the edge of valve port 15 In pit 13, the pit 13 can step down to the valve limited block 31 on rocker head 3.Usually, valve 2 is driven in rocker head 3 When, spacing in order to be carried out to valve 2, the both sides that rocker head 3 abuts valve end are provided with valve limited block 31, in current technique In, valve limited block 31 directly rolls press-bending by steel and formed, and is difficult complete precise control in size.So by gas Design, which is stepped down, on door spring base cheats, and can solve interference of the rocker body with cotter seat in mismachining tolerance and dimensional discrepancy and ask Topic.

As a kind of preferred embodiment, the depth of pit 13 is 1-3mm.

As a kind of preferred embodiment, pit 13 is toroid, and the external diameter of toroid is the 2/3 of the external diameter of top surface 11.

As a kind of preferred embodiment, the joining place of pit 13 and the edge of valve port 15 has chamfering 14.

As a kind of preferred embodiment, valve port 15 is bellmouth.

To sum up, the cotter seat of the present embodiment, the structure of the top surface 11 by changing existing spring base, there is provided a kind of The edge of the middle part protrusion top surface 11 of top surface 11 forms the spring base of annular protrusion 12, and the interior edge of annular protrusion 12 is extremely The edge of valve port 15 is in pit 13, and the pit 13 can step down to the valve limited block 31 on rocker head 3, can solve rocking arm Body and interference problem of the cotter seat in mismachining tolerance and dimensional discrepancy.

The foregoing description to specific illustrative embodiment of the present utility model is to illustrate and the purpose of illustration.These Description is not wishing to for the utility model to be defined to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explain certain principles of the present utility model And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shape Formula is limited.

Claims (5)

1. a kind of cotter seat, including spring base body, the spring base body has top surface and valve port, and its feature exists In the edge formation annular protrusion of the top surface is protruded in the middle part of the top surface, and the interior edge of the annular protrusion is extremely The edge of the valve port is in pit, and the pit is used for stepping down to the valve limited block on rocker head.

2. cotter seat according to claim 1, it is characterised in that the depth of the pit is 1-3mm.

3. cotter seat according to claim 1, it is characterised in that the pit is toroid, the toroid External diameter is the 2/3 of the top surface external diameter.

4. cotter seat according to claim 1, it is characterised in that the rank of the pit and the edge of the valve port Meeting place has chamfering.

5. cotter seat according to claim 1, it is characterised in that the valve port is bellmouth.