CN2921297Y

CN2921297Y - Reliever during gasoline machine starting

Info

Publication number: CN2921297Y
Application number: CN 200620110843
Authority: CN
Inventors: 车碧波; 骆勇
Original assignee: Chongqing Loncin Industry Group Co Ltd
Current assignee: Loncin General Dynamics Co Ltd
Priority date: 2006-06-23
Filing date: 2006-06-23
Publication date: 2007-07-11
Anticipated expiration: 2016-06-23

Abstract

The utility model discloses a pressure relief device upon starting of gasoline engine, comprising a shaft, an exhaust cam and a timing driven gear, which is the improvement in that a pressure relief valve is provided in the timing driven gear, a weight is provided at the lower end of the pressure relief valve and a protruding body at the upper end of the pressure relief, the radial height of the Protruding body is greater than that of the exhaust cam in contact with the protruding body; the pressure relief valve is fitted movably over the pressure relief valve pin, the Protruding body of the pressure relief valve is in contact with the exhaust cam via a torsion spring, the torsion spring is fitted over the pressure relief valve pin and applies a spring force on the Protruding body. The utility model simplifies and optimizes the product structure, facilitates the breaking and design of molds, improves the product reliability, reduces pressure upon starting and the pressure relief function is disabled after starting; and also reduces the difficulty of production and the manufacturing cost.

Description

The decompressor of using during gasoline starting

Technical field

The utility model relates to a kind of decompressor, the decompressor that especially be arranged on the camshaft, countercylinder reduces pressure when gasoline starting.

Background technique

During engine start, all will the gas that suck in the cylinder be compressed, near the compression terminal point, the gas pressure in the cylinder is very high, can reach about 300Mpa; As not reducing pressure, will make hand pull starting-up very the difficulty, very the effort.If in the time of manually can not overcoming above-mentioned gas pressure, will produce bounce-back, cause handle to slip out of the hand, cause the person or machine breakdown.So petrol engine need make valve be in suitable open mode when starting, suitably reduce pressure, the pressure of pressurized gas can not be too low certainly; But, behind gasoline engine starting, especially reach after the idling speed, need valve to be in closed condition again, the pressure-reducing function of pressure reduction structure is disappeared automatically, motor is in normal working.In the prior art, all generally adopt decompressor in petrol engine, the diesel engine, relevant decompressor has multiple structure, as decompressor of 186 diesel engines etc., such device usually is to make by centrifugal force to fly piece and rotate around the axis, and rotates and realizes that valve is by being opened to the conversion of closing thereby drive reduction valve.But, flying the movement locus complexity of piece in actual use, the required spatial position of moving is bigger, and it is not very desirable causing its effect of easing stress, and transmission is unreliable etc.; The complex structure of entire product, the mould structure complexity has strengthened the product manufacture difficulty, has increased the manufacture cost of product.

Summary of the invention

The utility model is at the above-mentioned deficiency of decompressor of the prior art, the decompressor of using when a kind of spatial position simple in structure, that movement locus is simplified, motion is required less gasoline starting is provided.

The technical solution of the utility model: the decompressor of using during gasoline starting, comprise axis body, exhaust cam, timing driven gear, its improvements are: in described timing driven gear reduction valve is set, the lower end of this reduction valve is a balance weight body, the upper end is a bump body, and the radial height of bump body is greater than the radial height of the exhaust cam that is in contact with it the position; Reduction valve is actively set on the decompression valve pin, and the bump body of reduction valve contacts with exhaust cam through torsion spring, and torsion spring set is on the decompression valve pin, and torsion spring produces the spring force effect to bump body;

Further feature is on the axis body below exhaust cam, to be provided with groove, protrudes physical efficiency and moves up and down in groove.

The decompressor of the utility model petrol engine with respect to prior art, has following characteristics:

1, simplified product structure, its structure has been optimized; Help die sinking, design of mould etc.;

2, improved reliability of products, can effectively play decompression when it starts, start the effect that the back pressure-reducing function disappears;

3, reduce the manufacture difficulty of product, reduced the manufacture cost of product.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described;

Fig. 1 is the structural front view to the utility model decompressor;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the plan view of Fig. 1.

Embodiment

In Fig. 1,2,3,1-axis body, 2-intake cam, 3-exhaust cam, 4-timing driven gear, 5-bluff body, 6-reduction valve, 7-pad, 8-torsion spring bushing pipe, 9-spring, the 10-valve pin that reduces pressure, 11-balance weight body, 12-bump body, 13-groove, 14-Pressure relief valve seat;

Decompressor of the present utility model, comprise axis body 1, intake cam 2, exhaust cam 3, timing driven gear 4 etc., on timing driven gear 4 and the engine crankshaft the timing driving gear be meshed, engine crankshaft drives its rotation when rotating, gear 4 was fastenedly connected with axis body 1 when timing was driven, drive its rotation, intake cam 2, exhaust cam 3 usually is to make all-in-one-piece with axis body 1, intake cam 2, exhaust cam 3 is followed axis body 1 and is rotated, thereby drive air inlet system and exhaust system and produce action, open or close intake valve, exhaust valve makes the air inlet system and exhaust system of motor produce corresponding air inlet or degassing function by technological requirement.Above as prior art, be not further described at this.

Decompressor of the present utility model, reduction valve 6 is set in timing driven gear 4, the lower end of this reduction valve 6 is balance weight body 11, its upper end is a bump body 12, bump body 12 protrudes from the exhaust cam 3 that is in contact with it the position, and promptly the radial height of bump body 12 is greater than the radial height of the exhaust cam 3 that is in contact with it the position; Reduction valve 6 is actively set on the decompression valve pin 10, can rotate about it; The balance weight body 11 of reduction valve 6 is passed timing driven gear 4, and the bump body 12 of reduction valve 6 contacts with exhaust cam 3 through torsion spring 9, and torsion spring 9 is enclosed within on the decompression valve pin 10 through torsion spring bushing pipe 8, and 9 pairs of bump bodies of torsion spring 12 produce the spring force effect; On the axis body 1 below exhaust cam 3, be provided with groove 13, bump body 12 can move up and down in groove 13.Decompression valve pin 10 is installed on the timing driven gear 4 through Pressure relief valve seat 14 together with reduction valve 6, torsion spring bushing pipe 8, torsion spring 9 etc., is provided with plain cushion 7 and bluff body 5 at an end of decompression valve pin 10, so that decompression valve pin 10 grades are fixedly mounted on the timing driven gear 4.

The working procedure of decompressor of the present utility model: before the gasoline starting, reduction valve 6 is under the spring force active force of torsion spring 9, make bump body 12 near exhaust cam 3 downsides, this moment is because bump body 12 is higher than exhaust cam 3 surfaces, thereby exhaust valve can be backed down, a part of gas is discharged from exhaust valve, reduce the pressure in the cylinder, reach the effect of decompression when starting, make the easier starting of petrol engine; After machine start, rising along with rotating speed, balance weight body 11 is subjected to centrifugal force and increases gradually, finally overcome the active force of torsion spring 9, the balance weight body 11 of reduction valve 6 lower ends is radially moved along the timing driven gear outward around decompression valve pin 10, and drive bump body 12 and move down, away from exhaust cam 3 downsides along groove 13, and disengage with exhaust valve, make exhaust valve closing.

Claims

1, the decompressor of using during gasoline starting, comprise axis body (1), exhaust cam (3), timing driven gear (4), it is characterized in that: reduction valve (6) is set in described timing driven gear (4), the lower end of reduction valve (6) is balance weight body (11), the upper end is bump body (12), and the radial height of bump body (12) is greater than the radial height of the exhaust cam that is in contact with it the position (3); Reduction valve (6) is actively set on the decompression valve pin (10), and the bump body (12) of reduction valve (6) contacts with exhaust cam (3) through torsion spring (9), and torsion spring (9) is enclosed within on the decompression valve pin (10), and torsion spring (9) produces the spring force effect to bump body (12).

2, the decompressor of using during gasoline starting according to claim 1, it is characterized in that: on the axis body (1) below exhaust cam (3), be provided with groove (13), bump body (12) can move up and down in groove (13).

3, the decompressor of using during gasoline starting according to claim 1 and 2, it is characterized in that: torsion spring (9) is enclosed within on the decompression valve pin (10) through torsion spring bushing pipe (8).

4, the decompressor of using during gasoline starting according to claim 1 and 2, it is characterized in that: reduction valve (6), torsion spring bushing pipe (8), torsion spring (9), decompression valve pin (10) are installed on the timing driven gear (4) through Pressure relief valve seat (14), are provided with plain cushion (7) and bluff body (5) at an end of decompression valve pin (10).