Vacuum booster

Abstract

The utility model relates to the field of boosters, and discloses a vacuum booster, a control valve assembly comprises an inner spring and a piston sleeve, the inner spring is located in the piston sleeve, one end of the inner spring abuts against the piston sleeve, and the other end of the inner spring abuts against an inner spring seat. The end of the piston sleeve abuts against the end of the valve head part so that the control valve assembly and the valve head part can be sealed. An assembling groove is formed in the side face of the control valve piston, the locking plate is installed in the assembling groove, a gap is reserved between the left side of the locking plate and the left end face of the valve head part, and the right side of the locking plate is supported on the shell assembly. The booster has the advantages of being accurate in control, rapid in response and the like.

Description

Technical Field

[0001] The utility model relates to the field of boosters, in particular to a vacuum booster. Background Art

[0002] CN202966284U provides a single-diaphragm vacuum booster, a common structure. Due to design and cost considerations, this type of vacuum booster creates a gap between the valve lip and the control valve assembly when the control valve assembly is not operating. In operation, a certain amount of idle travel is required to activate the pedal force to seal the control valve assembly and the lip.

[0003] The problem with this structure is that the booster itself has an idle stroke design, and the brake master cylinder also has requirements for idle stroke. The idle stroke of the vacuum booster makes it difficult to control the idle stroke of the subsequent brake master cylinder. Secondly, due to the existence of idle stroke, the control accuracy is poor and the performance is average.

[0004] Secondly, the booster housing adopts a riveted structure. When vacuum force is applied to the front and rear housings, the front diaphragm will be squeezed. Due to the characteristics of the riveting process, the extrusion of this part is more serious, and adjustments require on-site operators to make design adjustments. Utility Model Content

[0005] The utility model aims at the shortcomings of the prior art and provides a vacuum booster.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A vacuum booster includes a valve body and a housing assembly. The valve body defines a valve cavity, in which an inner spring seat, an outer spring seat, a control valve assembly, and a control valve piston are disposed. The valve body also includes a valve head portion, in which a cavity is formed. A control piston head is mounted in the cavity and can push a main push rod. An auxiliary push rod is mounted on the other end of the control valve piston. The auxiliary push rod can act on the main push rod through the control valve piston.

[0008] The control valve assembly includes an inner spring and a piston sleeve. The inner spring is located in the piston sleeve. One end of the inner spring abuts against the piston sleeve, and the other end abuts against the inner spring seat. The end of the piston sleeve abuts against the end of the valve head portion, thereby sealing the control valve assembly and the valve head portion.

[0009] It also includes a locking plate. An assembly groove is opened on the side of the control valve piston. The locking plate is installed in the assembly groove. A gap is reserved between the left side of the locking plate and the left end face of the valve head part. The right side of the locking plate is supported on the housing assembly.

[0010] Preferably, the portion of the left end of the piston sleeve used for sealing with the piston sleeve is a sealing lip, and a supporting sheet is provided inside the sealing lip.

[0011] Preferably, the inner ring portion of the outer end surface of the sealing lip is provided with an annular first sealing protrusion; the right end surface of the control piston is provided with an annular second sealing protrusion, the first sealing protrusion is located on the inner side of the second sealing protrusion, the first sealing protrusion abuts against the right end surface of the control piston, and the second sealing protrusion abuts against the outer end surface of the sealing lip.

[0012] Preferably, an outer spring is further included, one end of the outer spring abuts against the inner spring seat, and the other end abuts against the outer spring seat.

[0013] Preferably, the housing assembly includes a front housing and a rear housing, as well as a diaphragm and a return spring seat. A support ring is provided on the inner ring of the mouth of the rear housing, the outer surface of the rear housing is concavely folded inward to form a limiting protrusion, and a limiting rib is provided on the edge of the mouth of the front housing; the limiting rib is assembled between the limiting protrusion and the support ring; and a main return spring is also included, one end of the main return spring is supported on the front housing, and the other end is supported on the return spring seat; the edge of the diaphragm is pressed between the limiting rib and the support ring.

[0014] Preferably, an opening is provided on the lower side of the limiting protrusion.

[0015] Compared to existing technologies, this solution offers the following advantages: precise control, rapid performance release, and a convenient idle stroke design for the master brake cylinder. Furthermore, the housing design prevents excessive compression of the diaphragm, ensuring its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the internal structure of the booster.

[0017] Figure 2 for Figure 1 A partial enlarged view of .

[0018] Figure 3 Schematic diagram of the structure of the rear shell.

[0019] The technical names of the accompanying drawings are: 1-valve body, 2-housing assembly, 3-valve cavity, 4-inner spring seat, 5-outer spring seat, 6-control valve assembly, 7-control valve piston, 8-valve head part, 9-cavity, 10-main push rod, 11-auxiliary push rod, 12-inner spring, 13-locking plate, 14-gap, 15-assembly groove, 16-sealing lip, 17-valve port, 18-first sealing protrusion, 19-second sealing protrusion, 20-support plate, 21-front housing, 22-rear housing, 23-limiting rib, 24-support ring, 25-limiting protrusion, 26-opening. DETAILED DESCRIPTION

[0020] The present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] A vacuum booster includes a valve body 1 and a housing assembly 2. The valve body 1 defines a valve chamber 3, within which are disposed an inner spring seat 4, an outer spring seat 5, a control valve assembly 6, and a control valve piston 7. The valve body 1 also includes a valve head portion 8, within which is formed a cavity 9. The control piston head is mounted in the cavity 9 and can push a main push rod 10. A secondary push rod 11 is mounted at the other end of the control valve piston 7. The secondary push rod 11 can act on the main push rod 10 through the control valve piston 7.

[0023] The control valve assembly 6 includes an inner spring 12 and a piston sleeve. The inner spring 12 is located in the piston sleeve. One end of the inner spring 12 abuts against the piston sleeve, and the other end abuts against the inner spring 12 seat 4. The end of the piston sleeve abuts against the end of the valve head part 8, thereby sealing the control valve assembly 6 and the valve head part 8; the sealing lip 16 of the control valve assembly 6 is sealed with the valve port 17 of the valve head part 8, thereby realizing a sealing structure.

[0024] The control valve piston 7 also includes a locking plate 13. A mounting groove 15 is defined on the side of the control valve piston 7, and the locking plate 13 is mounted within this groove. A gap 14 is reserved between the left side of the locking plate 13 and the left end face of the valve head 8. The right side of the locking plate 13 is supported on the housing assembly 2. Requiring the valve port 17 and the sealing lip 16 to maintain a constant seal when not in operation places high demands on both the processing technology and the product. Furthermore, air pressure can easily cause a leak. Therefore, this solution incorporates a gap 14 at the locking plate 13 to increase the force between the valve port 17 and the sealing lip 16, thereby ensuring a reliable seal.

[0025] In order to ensure the dimensional stability of the sealing lip 16 in this solution, the portion of the left end of the piston sleeve used for sealing with the piston sleeve is the sealing lip 16 , and a support sheet 20 is provided inside the sealing lip 16 .

[0026] To reduce noise and isolate the air, an annular first sealing protrusion 18 is provided on the inner portion of the outer end surface of the sealing lip 16. An annular second sealing protrusion 19 is provided on the right end surface of the control piston. The first sealing protrusion 18 is located inside the second sealing protrusion 19. The first sealing protrusion 18 abuts the right end surface of the control piston, while the second sealing protrusion 19 abuts the outer end surface of the sealing lip 16. This embodiment also includes an outer spring, one end of which abuts the inner spring seat 4, and the other end abuts the outer spring seat 5.

[0027] In this embodiment, the housing assembly 2 includes a front housing 21 and a rear housing 22, as well as a diaphragm and a return spring seat. A support ring 24 is provided on the inner ring of the mouth of the rear housing 22. The outer surface of the rear housing 22 is folded inward to form a limiting protrusion 25, wherein the limiting protrusion 25 has a cross-sectional shape of ">". A limiting rib 23 is provided on the edge of the mouth of the front housing 21; the limiting rib 23 is a sheet-like structure and is assembled between the limiting protrusion 25 and the support ring 24. A main return spring is also included, with one end supported on the front housing 21 and the other end supported on the return spring seat. The edge of the diaphragm is pressed between the limiting rib 23 and the support ring 24. An opening 26 is provided on the lower side of the limiting protrusion 25. During assembly, the front shell 21 and the rear shell 22 are riveted at the position of the limiting protrusion 25. The front shell 21 and the rear shell 22 are tightly covered under the action of the main return spring and vacuum. The opening 26 is used to adapt to different sizes and reserve an assembly gap 14 to ensure that the front and rear shells 22 are not squeezed too tightly.

[0028] Compared to existing technologies, this solution offers the following advantages: precise control, rapid performance release, and a convenient idle stroke design for the master brake cylinder. Furthermore, the housing design prevents excessive compression of the diaphragm, ensuring its service life.

[0029] Example 2

[0030] A vehicle adopts the vacuum booster described in Example 1.

[0031] Example 3

[0032] On the basis of Example 1, the piston sleeve described in this embodiment is a rubber piece, which is sealed with the inner wall of the valve body 1.

Claims

1. A vacuum booster, comprising a valve body (1) and a housing assembly (2), wherein a valve cavity (3) is formed in the valve body (1), wherein an inner spring seat (4), an outer spring seat (5), a control valve assembly (6) and a control valve piston (7) are arranged in the valve cavity (3); the valve body (1) further comprises a valve head portion (8), wherein a cavity (9) is formed in the valve head portion (8), a control piston head is mounted in the cavity (9) and can push a main push rod (10), and an auxiliary push rod (11) is mounted at the other end of the control valve piston (7), and the auxiliary push rod (11) can act on the main push rod (10) through the control valve piston (7); and characterized in that: The control valve assembly (6) includes an inner spring (12) and a piston sleeve. The inner spring (12) is located in the piston sleeve. One end of the inner spring (12) abuts against the piston sleeve, and the other end abuts against the inner spring seat (4). The end of the piston sleeve abuts against the end of the valve head portion (8), thereby sealing the control valve assembly (6) and the valve head portion (8). The control valve piston (7) further comprises a locking plate (13). A mounting groove (15) is provided on the side of the control valve piston (7). The locking plate (13) is installed in the mounting groove (15). A gap (14) is reserved between the left side of the locking plate (13) and the left end face of the valve head portion (8). The right side of the locking plate (13) is supported on the housing assembly (2).

2. A vacuum booster according to claim 1, characterized in that: The portion of the left end of the piston sleeve used for sealing with the piston sleeve is a sealing lip (16), and a supporting sheet (20) is arranged inside the sealing lip (16).

3. A vacuum booster according to claim 2, characterized in that: An annular first sealing protrusion (18) is provided on the inner ring portion of the outer end surface of the sealing lip (16); an annular second sealing protrusion (19) is provided on the right end surface of the control piston, the first sealing protrusion (18) is located on the inner side of the second sealing protrusion (19), the first sealing protrusion (18) abuts against the right end surface of the control piston, and the second sealing protrusion (19) abuts against the outer end surface of the sealing lip (16).

4. The vacuum booster according to claim 1, characterized in that: It also includes an outer spring, one end of which abuts against the inner spring seat (4), and the other end of which abuts against the outer spring seat (5).

5. The vacuum booster according to claim 1, characterized in that: The housing assembly (2) includes a front housing (21) and a rear housing (22), and also includes a diaphragm and a return spring seat. The inner ring of the mouth of the rear housing (22) is provided with a support ring (24). The outer surface of the rear housing (22) is folded inward to form a limiting protrusion (25). The edge of the mouth of the front housing (21) is provided with a limiting rib (23); the limiting rib (23) is assembled between the limiting protrusion (25) and the support ring (24); and also includes a main return spring, one end of the main return spring is supported on the front housing (21), and the other end is supported on the return spring seat; the edge of the diaphragm is pressed between the limiting rib (23) and the support ring (24).

6. The vacuum booster according to claim 5, characterized in that: An opening (26) is provided on the lower side of the limiting protrusion (25).

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