Sealing structure between rear shell and valve body in vacuum booster

Abstract

The utility model relates to the technical field of automobile parts, in particular to a sealing structure between a rear shell and a valve body in a vacuum booster, which comprises a sealing structure main body, the sealing structure body comprises an outer fixing sleeve fixedly installed at the center of the end face, away from a brake cylinder, of a rear shell of the vacuum booster, a dustproof end cover fixedly installed at the end, away from the rear shell of the vacuum booster, of a control valve body, and a sealing moving ring fixedly arranged on the outer surface of the control valve body in a sleeving mode. A brake sliding cavity matched with the control valve body is formed in the fixed sleeve, a sealing fixed ring is embedded between the periphery of the inner wall of the brake sliding cavity and the sealing movable ring close to the dustproof end cover, and a sealing sliding groove matched with the sealing movable ring is formed in the side, close to the vacuum booster rear shell, of the sealing fixed ring. Through the design of the sealing structure body, the defects of abrasion and aging of rubber sealing are overcome in a mechanical sealing mode, the sealing performance is improved, the overall performance of the vacuum booster is guaranteed, and the sealing performance and stability of a braking system are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and specifically relates to a sealing structure between a rear shell and a valve body of a vacuum booster. BACKGROUND

[0002] The main function of the automobile vacuum booster is to increase the force exerted on the pedal by the driver by using vacuum negative pressure, so that the brake pedal becomes more labor-saving, ensures safe and rapid braking, and the vacuum booster is usually located between the brake pedal and the brake master cylinder, amplifies the pedal force of the driver, helps the driver to brake more easily, and the sealing property between the control valve body and the vacuum booster determines the sealing property and stability of the braking system, reduces noise and prolongs the service life,

[0003] However, with the passage of time, the rubber sealing ring part between the control valve body and the vacuum booster may be worn or aged, resulting in a decrease in sealing performance, thereby affecting the overall performance of the vacuum booster, and being not conducive to the sealing property and stability of the braking system. SUMMARY

[0004] The utility model discloses a sealing structure between a rear shell and a valve body of a vacuum booster, which improves the rubber sealing structure between the existing control valve body and the vacuum booster through the design of the sealing structure main body, overcomes the defects of wear and aging of the rubber sealing by using mechanical sealing, improves the sealing performance, guarantees the overall performance of the vacuum booster, and is conducive to the sealing property and stability of the braking system, so as to solve the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A sealing structure between a rear shell and a valve body of a vacuum booster, which comprises a sealing structure main body, the sealing structure main body comprises an outer fixed sleeve fixedly installed at the center of the one end face of the rear shell of the vacuum booster away from the brake cylinder, a dustproof end cover fixedly installed at the one end of the control valve body away from the rear shell of the vacuum booster and a sealing movable ring fixedly installed on the outer surface of the control valve body, a brake sliding cavity matched with the control valve body is formed in the inner part of the fixed sleeve, a sealing fixed ring is embedded and installed between the dustproof end cover and the sealing movable ring around the inner wall of the brake sliding cavity, a sealing sliding groove matched with the sealing movable ring is formed on the side of the sealing fixed ring close to the rear shell of the vacuum booster, and obtuse angles are symmetrically arranged at the two ends of the sealing sliding groove.

[0007] As the preferred scheme of the utility model, the control valve body is slidably installed inside the outer fixing sleeve, the dustproof end cover and the outer fixing sleeve are riveted away from one end of the vacuum booster rear shell, and the sealing moving ring is located on the side of the dustproof end cover close to the vacuum booster rear shell.

[0008] As the preferred scheme of the utility model, the dustproof end cover is provided with air holes in a ring shape around the center, and the sealing moving ring is provided with inner grooves on both end faces and symmetrical with the sealing sliding grooves.

[0009] As the preferred scheme of the utility model, the control valve body is slidably installed inside the outer fixing sleeve, the dustproof end cover and the outer fixing sleeve are riveted away from one end of the vacuum booster rear shell, and the sealing moving ring is located on the side of the dustproof end cover close to the vacuum booster rear shell.

[0010] As the preferred scheme of the utility model, the control valve body is slidably installed inside the outer fixing sleeve, the dustproof end cover and the outer fixing sleeve are riveted away from one end of the vacuum booster rear shell, and the sealing moving ring is located on the side of the dustproof end cover close to the vacuum booster rear shell.

[0011] As the preferred scheme of the utility model, the control valve body is slidably installed inside the outer fixing sleeve, the dustproof end cover and the outer fixing sleeve are riveted away from one end of the vacuum booster rear shell, and the sealing moving ring is located on the side of the dustproof end cover close to the vacuum booster rear shell.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] In the utility model, the rubber sealing structure between the existing control valve body and the vacuum booster is improved through the design of the sealing structure main body, the defects of wear and aging of the rubber sealing are overcome by using mechanical sealing, the sealing performance is improved, the overall performance of the vacuum booster is ensured, and the sealing performance and stability of the braking system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model discloses an overall three-dimensional external structure Figure 1 ;

[0015] Figure 2 For the overall three-dimensional external structure of the utility model Figure 2 ;

[0016] Figure 3 For the control valve body local section three-dimensional structure diagram of the utility model;

[0017] Figure 4 For the overall plane internal structure diagram of the utility model.

[0018] In the figure: 1, sealing structure main body; 2, vacuum booster rear shell; 21, front shell; 22, diaphragm; 23, vacuum valve; 24, A chamber; 25, B chamber; 26, vacuum suction port; 27, vacuum pressure sensor; 3, outer fixed sleeve; 31, brake sliding cavity; 32, sealing solid ring; 33, sealing sliding groove; 34, obtuse angle; 4, control valve body; 41, valve rod; 411, piston; 412, vacuum valve core; 413, brake cylinder push rod; 414, return spring; 415, pedal connection hinge base; 416, air filter element; 417, reset spring; 42, air valve; 43, air passage; 5, dustproof end cover; 51, air hole; 6, sealing moving ring; 61, inner groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0020] Embodiment:

[0021] The utility model embodiment provides a kind of sealing structure between vacuum booster rear shell and valve body, improve the rubber sealing structure between existing control valve body and vacuum booster by the design of sealing structure main body, overcome the defect of wear and tear of rubber sealing using mechanical sealing mode, improve sealing performance, guarantee the overall performance of vacuum booster, benefit the sealing property and stability of brake system, to solve the problems proposed in the above background technique;

[0022] Please refer to Figures 1-4 , the utility model provides a kind of technical scheme:

[0023] A sealing structure between a rear shell and a valve body in a vacuum booster, comprising a sealing structure main body 1, the sealing structure main body 1 comprising an outer fixed sleeve 3 fixedly installed at the center of the end of the vacuum booster rear shell 2 away from the brake cylinder, a dustproof end cover 5 fixedly installed at the end of the control valve body 4 away from the vacuum booster rear shell 2, and a sealing movable ring 6 fixedly installed on the outer surface of the control valve body 4, the control valve body 4 being slidingly installed in the inner part of the outer fixed sleeve 3, the dustproof end cover 5 and the outer fixed sleeve 3 being riveted at the end away from the vacuum booster rear shell 2, and the sealing movable ring 6 being located at the side of the dustproof end cover 5 close to the vacuum booster rear shell 2, the existing rubber sealing structure between the control valve body 4 and the vacuum booster being improved by the design of the sealing structure main body 3, the defects of wear and aging of the rubber sealing being overcome by the mechanical sealing, the sealing performance being improved, the overall performance of the vacuum booster being ensured, and the sealing performance and stability of the brake system being improved.

[0024] The inner part of the fixed sleeve 3 is provided with a brake sliding cavity 31 matched with the control valve body 4, the sealing fixed ring 32 is embedded and installed around the inner wall of the brake sliding cavity 31 between the dustproof end cover 5 and the sealing movable ring 6, the sealing sliding groove 33 matched with the sealing movable ring 6 is formed at the side of the sealing fixed ring 32 close to the vacuum booster rear shell 2, the obtuse angles 34 are symmetrically arranged at the two ends of the sealing sliding groove 33, the air holes 51 are arranged in a ring shape around the center of the dustproof end cover 5, the inner recess grooves 61 matched with the symmetrically arranged obtuse angles 34 at the two ends of the sealing sliding groove 33 are formed at the two end faces of the sealing movable ring 6, and the control valve body 4 slides in the brake sliding cavity 31 from the brake pedal to the brake cylinder under the action of the pressure difference during braking, at this time, the sealing fixed ring 32 is stationary, and the sealing movable ring 6 slides in the sealing sliding groove 33, the symmetrically arranged obtuse angles 34 at the two ends of the sealing sliding groove 33 and the matched inner recess grooves 61 can realize the mechanical sealing between the vacuum booster rear shell 2 and the control valve body 4 during braking, which is not only long-lasting and effective, but also more conducive to the stable reliability of the control valve body 4, and has a better protective effect on the control valve 4.

[0025] In addition, in this embodiment, please refer to Figure 4, the side of the vacuum booster rear shell 2 away from the outer fixed sleeve 3 is fixedly installed with a front shell 21, a diaphragm 22 is movably installed between the vacuum booster rear shell 2 and the front shell 21, the center of the diaphragm 22 is embeddedly installed with a vacuum valve 23, the vacuum valve 23 is provided with an A chamber 24 and a B chamber 25 on the side close to the vacuum booster rear shell 2 and the front shell 21 respectively, the side of the B chamber 25 away from the A chamber 24 is fixedly installed with a vacuum suction port 26 and a vacuum pressure sensor 27, before braking, the vacuum valve 23 is opened, the A chamber 24 and the B chamber 25 are communicated, the vacuum pump uses the vacuum suction port 26 to pump the A chamber 24 and the B chamber 25, and during braking, the vacuum valve 23 is closed, the A chamber 24 and the B chamber 25 are in a gas pressure state and a vacuum state respectively, and under the action of pressure difference, the diaphragm 22 is offset and deformed to the B chamber 25, so that easy braking is realized, and the vacuum chamber can be detected in real time through the vacuum pressure sensor 27, which is beneficial to the safety and stability of the braking system;

[0026] In addition, in this embodiment, please refer to Figure 3 and Figure 4 , the control valve body 4 is movably installed with a valve rod 41, one end of the valve rod 41 away from the vacuum booster rear shell 2 extends to the outside of the outer fixed sleeve 3 through the center of the dustproof end cover 5, the inner wall of the control valve body 4 is fixedly installed with an air valve 42 on the side close to the vacuum booster rear shell 2, the upper and lower ends of the air valve 42 on the side close to the vacuum booster rear shell 2 are both provided with an air channel 43, one end of the valve rod 41 close to the air valve 42 is fixedly connected with a piston 411, and the piston 411 is located on the side of the air valve 42 close to the air channel 43, one end of the piston 411 close to the air channel 43 is fixedly connected with a brake cylinder push rod 413 through a vacuum valve core 412, the outer surface of the brake cylinder push rod 413 movably sleeved with a return spring 414, one end of the valve rod 41 close to the dustproof end cover 5 is fixedly installed with a pedal connecting hinge base 415, the outer surface of the valve rod 41 is fixedly sleeved with an air filter element 416, the air filter element 416 and the air valve 42 are movably installed with a reset spring 417, after stepping on the brake pedal, the valve rod 41 is stressed, at this time, the reset spring 417 is compressed, and at the same time, the air valve 42 is opened, then the piston 411 moves to the side of the air channel 43 away from the air valve 42, and the vacuum valve core 412 closes the vacuum valve 23 at the same time, at this time, the external air enters the A chamber 24 through the air valve 42 and the air channel 43, and easy braking is realized by using pressure difference, when the brake pedal is released, the valve rod 41 is automatically reset under the action of the reset spring 417, and the piston 411 closes the air valve 42, the vacuum valve 23 is opened, then the A chamber 24 restores to vacuum, the diaphragm 22 restores, and at the same time, the control valve body 4 is automatically reset under the action of the return spring 414, and the design of the air filter element 416 can filter the impurities and dust in the air, so as to avoid the influence of particulate impurities and dust on braking;

[0027] In the embodiment, the specific implementation scene is that before braking, the vacuum valve 23 is opened, the A chamber 24 and the B chamber 25 are communicated, the vacuum pump uses the suction port 26 to pump the A chamber 24 and the B chamber 25, after the brake pedal is stepped on, the valve rod 41 is stressed, at this time, the external air enters the inside of the brake sliding chamber 31 from the air hole 51, and the reset spring 417 is compressed, at the same time, the air valve 42 is opened, then the piston 411 moves to the side of the air channel 43 away from the air valve 42, and the vacuum valve core 412 closes the vacuum valve 23, at this time, the external air enters the A chamber 24 through the air valve 42 and the air channel 43, the A chamber 24 and the B chamber 25 are in the air pressure state and the vacuum state respectively, and under the action of the pressure difference, the diaphragm 22 is deformed and offset to the B chamber 25, at this time, the control valve body 4 is slid in the brake sliding chamber 31 from the brake pedal to the brake cylinder under the action of the pressure difference, at this time, the sealing fixed ring 32 is not moved, and the sealing movable ring 6 is slid in the sealing sliding groove 33, and easy braking is realized, when the brake pedal is released, the valve rod 41 is automatically reset under the action of the reset spring 417, the piston 411 closes the air valve 42, the vacuum valve 23 is opened, then the A chamber 24 restores the vacuum, the diaphragm 22 is reset, at the same time, the control valve body 4 is automatically reset under the action of the reset spring 414, the whole is sealed by the mechanical sealing mode, the defects of wear and aging of the rubber sealing are overcome, the sealing performance is improved, the overall performance of the vacuum booster is ensured, and the sealing performance and stability of the brake system are beneficial.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure between the rear housing and the valve body in a vacuum booster, comprising a sealing structure body (1), characterized in that: The main body (1) of the sealing structure includes an outer fixed sleeve (3) fixedly installed at the center of the end face away from the brake cylinder of the rear housing (2) of the vacuum booster, a dustproof end cap (5) fixedly installed at the end of the control valve body (4) away from the rear housing (2) of the vacuum booster, and a sealing moving ring (6) fixedly fitted on the outer surface of the control valve body (4). The fixed sleeve (3) has a brake slide cavity (31) adapted to the control valve body (4) inside. A sealing fixed ring (32) is embedded and installed around the inner wall of the brake slide cavity (31) near the dustproof end cap (5) and the sealing moving ring (6). A sealing groove (33) adapted to the sealing moving ring (6) is opened on the side of the sealing fixed ring (32) near the rear housing (2) of the vacuum booster. Obtuse angles (34) are symmetrically distributed at both ends of the sealing groove (33).

2. The sealing structure between the rear housing and the valve body in a vacuum booster according to claim 1, characterized in that: The control valve body (4) is slidably installed inside the outer fixed sleeve (3). The dustproof end cap (5) and the outer fixed sleeve (3) are riveted to one end away from the vacuum booster rear housing (2). The sealing dynamic ring (6) is located on the side of the dustproof end cap (5) close to the vacuum booster rear housing (2).

3. The sealing structure between the rear housing and the valve body in a vacuum booster according to claim 1, characterized in that: The dustproof end cap (5) has annularly distributed air holes (51) around its center. The sealing ring (6) has inner grooves (61) on both ends that match the obtuse angles (34) symmetrically distributed at both ends of the sealing groove (33).

4. The sealing structure between the rear housing and the valve body in a vacuum booster according to claim 1, characterized in that: A valve stem (41) is movably installed inside the control valve body (4), and the end of the valve stem (41) away from the rear housing (2) of the vacuum booster extends through the center of the dustproof end cover (5) to the outside of the outer fixed sleeve (3). An air valve (42) is fixedly installed on the inner wall of the control valve body (4) near the rear housing (2) of the vacuum booster. Air passages (43) are opened at both the upper and lower ends of the air valve (42) near the rear housing (2) of the vacuum booster.

5. The sealing structure between the rear housing and the valve body in a vacuum booster according to claim 4, characterized in that: A piston (411) is fixedly connected to one end of the valve stem (41) near the air valve (42), and the piston (411) is located on the side of the air valve (42) near the air passage (43). A brake cylinder push rod (413) is fixedly connected to one end of the piston (411) near the air passage (43) through a vacuum valve core (412). A return spring (414) is movably fitted on the outer surface of the brake cylinder push rod (413). A pedal connecting hinge seat (415) is fixedly installed on one end of the valve stem (41) near the dustproof end cover (5). An air filter element (416) is fixedly fitted on the outer surface of the valve stem (41). A return spring (417) is movably installed between the air filter element (416) and the air valve (42).

6. The sealing structure between the rear housing and the valve body in a vacuum booster according to claim 1, characterized in that: A front housing (21) is fixedly installed on the side of the rear housing (2) of the vacuum booster away from the outer fixed sleeve (3). A diaphragm (22) is movably installed inside the rear housing (2) and the front housing (21) of the vacuum booster. A vacuum valve (23) is embedded in the center of the diaphragm (22). An A chamber (24) and a B chamber (25) are respectively provided on the side of the vacuum valve (23) close to the rear housing (2) and the front housing (21) of the vacuum booster. A vacuum suction port (26) and a vacuum pressure sensor (27) are fixedly installed on the side of the B chamber (25) away from the A chamber (24).

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