CN200977909Y

CN200977909Y - Labor-saving automobile brake valve piston

Info

Publication number: CN200977909Y
Application number: CN 200620022363
Authority: CN
Inventors: 王昆华
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-13
Filing date: 2006-09-13
Publication date: 2007-11-21
Anticipated expiration: 2016-09-13

Abstract

Disclosed is a labor-saving vehicle brake valve piston. A piston case is situated inside the shell body; a valve core shaft which can move up and down is connected inside the piston case; a spring press shell is arranged on the internal wall of the cylinder-shaped valve core shaft; compression springs are provided in a sealed groove between the internal wall of the valve core shaft and the spring press shell; a piston push rod is arranged in the spring press shell; a mandrel is arranged on the upper end of the piston push rod, while the lower end of the piston rod is connected inside the thin neck situated at the lower part of the valve core shaft. In the utility model, the lower end surface of the internal wall of the piston case and the internal end surface of the lower part of the valve core shaft are designed into slopes with certain gradient to form an airflow oriented angle, thereby avoiding empty stepping in an emergent brake to improve security and reduce the damage to the brake drum. The thin neck end of the lower part of the valve core shaft is designed into two tapered slopes, therefore, in a foot braking, the inlet air pressure is reduced because the second seal has a throttle effect on the braking air pressure, thereby the softness in braking is improved. The external wall of the piston case is provided with three rubber seal rings, with improved stability.

Description

A kind of laborsaving piston for brake valve of car

Technical field:

The utility model relates to the automobile brake parts, especially a kind of laborsaving piston for brake valve of car.

Background technology:

China Patent No. is that the utility model of 01259573X discloses " integrated car brake piston valve ", its piston is arranged in the overcoat bearing fit, but the jump ring that it is provided with on outer casing inner wall causes piston moving up and down in overcoat to realize owing to blocked the position that protrude on piston top.In addition, the bottom inner end surface of the thin neck of its piston bottom inner end surface and outer casing inner wall is the plane, when steerman is stepped on the brake pedal emergency brake downwards, the thin neck bottom inner end surface of piston contacts fully with overcoat to be shut, make high pressure gas can not enter compressed air brake cylinder on the contrary, thereby brake the time empty pin can occur, even causes traffic accident.Besides, the thin neck of piston bottom has only a conical inclined surface, and soft property is relatively poor during the point braking.At last, its overcoat has only two road seal rings, and stability is not enough, and piston can be partial to when motion, causes gas leakage.

Summary of the invention:

Deficiency at above-mentioned prior art existence, the utility model provides a kind of laborsaving piston for brake valve of car, it comprises housing, piston jacket, piston push rod, poppet shaft, spring press-cover, push rod, rubber seal, piston jacket is positioned at housing, the poppet shaft that can move up and down is positioned at piston jacket and connects, feature is: columnar poppet shaft inwall is equipped with spring press-cover, piston push rod is housed in the spring press-cover, push rod is equipped with in the piston push rod upper end, the thin neck that the lower end is positioned at the poppet shaft bottom is connected, the inwall lower surface of piston jacket and the inner end surface of poppet shaft bottom are the inclined-plane that certain slope is arranged, and there are two conical inclined surface thin neck bottom.

Be furnished with three road rubber seal on the described piston jacket outer wall, wherein twice are near outer set upper side, together near the overcoat lower end.

In the sealed groove between described poppet shaft inwall and the spring press-cover compression spring is arranged.

There is a liner between piston push rod outer wall and poppet shaft inwall described spring press-cover upper end.

The utility model is designed to the inclined-plane of certain slope with the inner end surface of the inwall lower surface of piston jacket and poppet shaft bottom, and the air-flow guide angle is provided, thereby empty pin can not occur when making sudden stop, has improved safety, and can alleviate the damage to brake drum; Two conical inclined surface of the narrow neck end of poppet shaft bottom design, thus during the point braking owing to there be second to seal the throttling action that plays braking pressure, air inlet is pressed and is reduced, and has obviously improved the soft property of glancing impact; Arrange three road rubber seal on the piston jacket outer wall, improved stability.

Description of drawings:

Fig. 1 is according to structural representation of the present utility model.

The specific embodiment:

Reach embodiment in conjunction with the accompanying drawings and describe, but protection domain of the present utility model is not limited to accompanying drawing and embodiment.

As shown in the figure, a kind of laborsaving piston for brake valve of car that the utility model proposes, it comprises housing 12, piston jacket 1, piston push rod 2, poppet shaft 4, spring press-cover 5, push rod 6, rubber seal 8, piston jacket is positioned at housing, the poppet shaft that can move up and down is positioned at piston jacket and connects, columnar poppet shaft inwall is equipped with spring press-cover, and compression spring 3 is arranged in the sealed groove between poppet shaft inwall and the spring press-cover.Piston push rod is housed in the spring press-cover, and push rod is equipped with in piston push rod upper end, and the thin neck that the lower end is positioned at the poppet shaft bottom is connected, and there is a liner 7 between piston push rod outer wall and poppet shaft inwall the spring press-cover upper end.The inwall lower surface 10 of piston jacket is made as the inclined-plane that becomes to have certain slope with the inner end surface 9 of poppet shaft bottom, and there are two conical inclined surface 11 the thin neck bottom of poppet shaft bottom.Arrange three road rubber seal 8 on the piston jacket outer wall, wherein twice are near outer set upper side, together near the overcoat lower end.

Claims

1, a kind of laborsaving piston for brake valve of car, comprise housing, piston jacket, piston push rod, poppet shaft, spring press-cover, push rod, rubber seal, piston jacket is positioned at housing, the poppet shaft that can move up and down is positioned at piston jacket and connects, it is characterized in that: columnar poppet shaft inwall is equipped with spring press-cover, piston push rod is housed in the spring press-cover, push rod is equipped with in the piston push rod upper end, the thin neck that the lower end is positioned at the poppet shaft bottom is connected, the inwall lower surface of piston jacket and the inner end surface of poppet shaft bottom are the inclined-plane that certain slope is arranged, and there are two conical inclined surface thin neck bottom.

2, a kind of laborsaving piston for brake valve of car as claimed in claim 1 is characterized in that: be furnished with three road rubber seal on the piston jacket outer wall, wherein twice are near outer set upper side, together near the overcoat lower end.

3, a kind of laborsaving piston for brake valve of car as claimed in claim 1 is characterized in that: in the sealed groove between poppet shaft inwall and the spring press-cover compression spring is arranged.

4, a kind of laborsaving piston for brake valve of car as claimed in claim 1 is characterized in that: there is a liner between piston push rod outer wall and poppet shaft inwall spring press-cover upper end.