CN210686792U - Low-pressure accumulator and vehicle brake system comprising a low-pressure accumulator - Google Patents
Low-pressure accumulator and vehicle brake system comprising a low-pressure accumulator Download PDFInfo
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- CN210686792U CN210686792U CN201921721671.1U CN201921721671U CN210686792U CN 210686792 U CN210686792 U CN 210686792U CN 201921721671 U CN201921721671 U CN 201921721671U CN 210686792 U CN210686792 U CN 210686792U
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- 230000004323 axial length Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 17
- 238000007789 sealing Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The present application relates to a low pressure accumulator for a vehicle braking system, comprising: a cylinder body; a piston axially reciprocably received within the cylinder, the piston defining an axial stroke and an outer surface; and a leading ring and a trailing ring disposed adjacent opposite ends of the piston, respectively; and a seal disposed between the leading and trailing rings and fitted over the piston, the seal abutting and sliding through a first axial region of the inner surface of the cylinder during the entire axial stroke of the piston; wherein at least one of the leading ring and the trailing ring: embedded in a cylinder annular groove formed on the inner surface of the cylinder and sliding against the outer surface of the piston as the piston moves axially, or embedded in a piston annular groove formed on the outer surface of the piston and sliding against a second axial region of the inner surface of the cylinder as the piston moves axially, the first and second axial regions being axially spaced apart. The present application further provides a vehicle braking system including the low pressure accumulator described above.
Description
Technical Field
The present application relates to the field of vehicle braking, and in particular to a low pressure accumulator for a vehicle braking system and a vehicle braking system including such a low pressure accumulator.
Background
Vehicle braking systems are typically installed in vehicles to provide safety braking for the vehicle. The vehicle brake system mainly comprises a brake master cylinder and a brake circuit. The brake master cylinder receives brake fluid from a brake fluid reservoir and supplies the brake fluid to a brake circuit, which generates brake pressure by receiving braking force caused by operating a brake pedal of a vehicle and amplified by a booster. The brake circuit includes hydraulic components such as solenoid-operated valves, low-pressure accumulators, and pumps to achieve and control the brake pressure transmitted to the hydraulic brakes at the front and rear wheels. A low pressure accumulator is an energy storage device in the brake circuit that is filled with brake fluid to store energy in the system or drained of brake fluid to release energy as needed.
The low pressure accumulator includes a cylinder and a piston axially reciprocating within the cylinder. Two guide rings for guiding the axial movement of the piston are embedded and fixed on the piston near two ends of the piston, and a sealing piece sleeved on the piston is arranged between the two guide rings. Both the guide ring and the seal slide reciprocally against the inner surface of the cylinder as the piston moves axially within the cylinder, but there is overlap between the area of the inner surface of the cylinder in sliding contact with the guide ring and the area of the inner surface of the cylinder in sliding contact with the seal.
However, the guide ring of hard material may cause scratches or other friction defects in the area of the inner surface of the cylinder in sliding contact therewith as it moves back and forth, and the seal of elastomeric material no longer seals the outer surface of the piston and the inner surface of the cylinder well when it moves into contact with this scratched area, thereby causing brake fluid at one end of the piston within the cylinder to leak to the other end of the piston, affecting the movement of the piston and thus the performance of the low pressure accumulator.
It is desirable to be able to solve this problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the poor sealed problem between the sealing member of low pressure accumulator and the scratched cylinder body internal surface of at least one in the guided ring.
To this end, according to a first aspect of the present invention, there is provided a low pressure accumulator for a vehicle braking system, comprising:
a cylinder having an inner surface defining an interior space;
a piston axially reciprocally received within the interior space, the piston defining an axial stroke and an outer surface opposite the inner surface; and
a leading ring and a trailing ring disposed adjacent opposite first and second ends of the piston, respectively; and
a seal disposed axially between the leading and trailing rings and fitted over the piston, the seal abutting and sliding over a first axial region of the inner surface of the cylinder during the entire axial stroke of the piston;
wherein at least one of the leading ring and the trailing ring:
is embedded in a cylinder ring groove formed on the inner surface of the cylinder and slides against the outer surface of the piston when the piston moves axially, or
Is embedded in a piston annular groove formed on an outer surface of the piston and slides against a second axial region of the inner surface of the cylinder upon axial movement of the piston, the first axial region being axially spaced from the second axial region.
In one embodiment, the first axial region is axially spaced from the second axial region by a distance that has a minimum value of zero.
In one embodiment, the leading and trailing guide rings are both embedded within two cylinder annular grooves formed on an inner surface of the cylinder, respectively, or both embedded within two piston annular grooves formed on an outer surface of the piston, respectively, and each have a respective second axial region axially spaced from the first axial region.
In one embodiment, the leading ring is embedded in a cylinder ring groove formed on an inner surface of the cylinder, and the trailing ring is embedded in a piston ring groove formed on an outer surface of the piston.
In one embodiment, the axial spacing between the back guide ring located in the piston annular groove and the seal is greater than the axial travel of the piston.
In one embodiment, the piston has a tapered guide section starting at the first end, the tapered guide section having an axial length greater than a width of the leading ring.
In one embodiment, the guide ring slides between a conical guide section of the piston and a seal provided on the piston over the entire axial stroke of the piston.
In one embodiment, the seal is sleeved on the outer surface of the piston or embedded in a seal groove formed on the outer surface of the piston.
A second aspect of the present application provides a vehicle braking system comprising the low pressure accumulator described above.
According to the present application, by arranging one or both of the guide rings of the low pressure accumulator to be embedded in the inner surface of the cylinder, the guide rings no longer follow the piston, do not come into sliding contact with the inner surface of the cylinder and therefore do not damage it, so that the above-mentioned sealing problem is no longer present. Alternatively, the respective guide rings and seals may be arranged such that the cylinder inner surface areas in sliding contact therewith are spaced apart in the axial direction of the piston movement, and the seals are no longer in contact with the cylinder inner surface areas in sliding contact with the guide rings, with the objective of fundamentally solving the above-mentioned sealing problem.
Drawings
The above and other features of the present invention will be better understood from the following detailed description of embodiments thereof, given with reference to the accompanying drawings. The drawings are not to scale and are merely illustrative of the principles of the invention.
FIG. 1 shows a cross-sectional view of a portion of a low pressure accumulator for a vehicle braking system.
Detailed Description
Fig. 1 shows a possible embodiment of the present application, to which the principles of the invention are described below.
A cross-sectional view of a portion of a low pressure accumulator for a vehicle braking system is shown in fig. 1. Specifically, the figures show a cylinder 10 having an inner surface 12 defining an inner space housing a piston 20 and defining a liquid inlet 11 and a liquid outlet 13; the figure also shows a piston 20 housed in the internal space of the cylinder 10 and reciprocally movable in the axial direction Z in this internal space.
The end of the piston 20 adjacent to the inlet 11 and the outlet 13 of the cylinder 10 is referred to as a first end or a liquid end of the piston 20, and the end opposite to the first end or the liquid end and abutting against the spring 30 is referred to as a second end or a spring end. At the spring end of the piston 20 there is a blind hole (not shown) for at least partially receiving the spring 30, the spring 30 being disposed between the piston 20 and an end cap 40 of the cylinder 10, one end of which is received within the blind hole of the spring end of the piston 20 to abut the closed inner end of the blind hole and the other end of which abuts on the end cap 40.
Near the fluid end and the spring end of the piston 20, respectively, a leading ring 50 and a trailing ring 60 are provided for guiding the axial movement of the piston 20. The guide ring 50 is embedded in a cylinder annular groove 14 formed on the inner surface 12 of the cylinder 10 and protrudes out of the inner surface 12 toward the piston 20 to engage the outer surface 22 of the piston 20, thereby serving to guide the piston 20. The rear guide ring 60 is embedded in a piston ring-shaped groove 24 formed on the outer surface 22 of the piston 20 and protrudes toward the inner surface 12 of the cylinder 10 to engage the inner surface 12 of the cylinder 10, thereby functioning to guide the piston 20.
Seal 70 is disposed between leading ring 50 and trailing ring 60 in axial direction Z. Similar to the rear guide ring 60, the sealing member 70 is embedded in the sealing groove 26 formed on the outer surface 22 of the piston 20 and sealingly engages the inner surface 12 of the cylinder 10 when the piston 20 moves in the axial direction Z, so that the brake fluid entering the inner space of the cylinder 10 from the inlet port 11 is held at the liquid end of the piston 20, preventing the brake fluid from entering the spring end of the piston through between the sealing member 70 and the inner surface 12 of the cylinder 10.
Fig. 1 shows the piston 20 of the low-pressure accumulator in an initial position when it is not filled with brake fluid. When brake fluid enters the inner space accommodating the piston 20 through the inlet 11 of the accumulator, the brake fluid first acts on the fluid end of the piston 20. When the urging force of the brake fluid against the piston 20 overcomes the elastic force of the spring 30, the piston 20 starts moving to compress the spring 30. During the movement of the piston 20, the front guide ring 50 does not move with the piston 20 as it is embedded in the cylinder 10, only the seal 70 and the rear guide ring 60 embedded in the piston 20 slide backwards with the piston 20 against the inner surface 12 of the cylinder 10 until the spring 30 is fully compressed into the blind hole of the piston 20 and the spring end of the piston 20 directly abuts the end cap 40 in the extreme movement position. The axial distance through which the piston 20 moves during this is referred to as the axial stroke. When brake fluid exits the accumulator via the outlet port 13, the piston 20 is moved axially in opposition by the restoring force of the spring 30 until the initial position shown in the drawing is reached.
Unlike being fixed to the outer surface of the piston 20 in an embedded manner, the front guide ring 50 of the present application is configured to be fixed in the cylinder 10 in an embedded manner, so that the front guide ring 50 no longer moves in the axial direction Z of the piston 20 and does not slide relative to the inner surface 12 of the cylinder 10, i.e., does not scratch the inner surface 12 of the cylinder 10. This avoids the prior art situation where the seal 70 makes poor sealing contact with the area of the inner surface 12 that is gouged by the pilot ring 50, thereby resulting in leakage.
As shown, the liquid end of the piston 20 is provided with a tapered guide 28 starting from the liquid end to play a role of centering and guiding the piston 20 during the installation of the piston 20 into the inner space of the cylinder 10. As the piston 20 reciprocates axially between the initial and limit travel positions, the leading ring 50 slides between the seal 70 and the tapered guide 28 against the outer surface 22 of the piston 20. Preferably, the axial length of the tapered guide 28 is greater than the axial width of the leading ring 50.
Further, the present application of the trailing guide ring 60 also overcomes the problem of the prior art where the seal 70 may leak when in contact with the area of the cylinder inner surface scraped by the trailing guide ring 60 during axial movement with the piston 20, but in a different manner than the leading guide ring 50.
Specifically, as the piston 20 moves through the entire axial stroke, the rear guide ring 60 slides through a first axial region of the inner surface 12 of the cylinder 10 and the seal 70 slides through a second axial region of the inner surface 12 of the cylinder 10. According to the present application, the first axial region of the back guide ring 60 is spaced apart, i.e. does not intersect, in the axial direction Z from the second axial region of the seal 70. That is, the seal 70 does not always contact the area of the cylinder inner surface that may be scratched by the back guide ring 60 during the axial movement of the piston 20. This avoids the possibility of poor sealing and leakage of brake fluid due to contact of the seal 70 with the inner surface 12 scratched by the back guide ring 60. According to the present application, the axial distance separating the first axial region of the back guide ring 60 and the second axial region of the seal 70 in the axial direction Z may be zero when the required length of the piston 20 is minimal.
As described above, in the low pressure accumulator structure of the present invention, the front guide ring 50 and the rear guide ring 60 are provided differently from each other to solve the problem of the sealing failure and the leakage of the brake fluid caused by the contact of the sealing member with the cylinder inner surface area which may be scratched by the front guide ring and the rear guide ring.
Those skilled in the art will appreciate that the various techniques described above for leading ring 50 and trailing ring 60 may be used interchangeably. It should also be understood that both leading and trailing rings may employ the same techniques as described above with respect to leading ring 50, or both leading and trailing rings may employ the same techniques as described above with respect to trailing ring 60, to address the same technical problem.
Various embodiments of the present invention have been described above with reference to the accompanying drawings. It will be appreciated by a person skilled in the art that the scope of protection of the present application is not limited solely to the embodiments described above and shown in the drawings, but that features disclosed in different embodiments can be recombined to form new embodiments without departing from the basic principle of the application. The scope of protection of this application is only limited by the claims.
Claims (9)
1. A low pressure accumulator for a vehicle braking system, comprising:
a cylinder having an inner surface defining an interior space;
a piston axially reciprocally received within the interior space, the piston defining an axial stroke and an outer surface opposite the inner surface; and
a leading ring and a trailing ring disposed adjacent opposite first and second ends of the piston, respectively; and
a seal disposed axially between the leading and trailing rings and fitted over the piston, the seal abutting and sliding over a first axial region of the inner surface of the cylinder during the entire axial stroke of the piston;
wherein at least one of the leading ring and the trailing ring:
is embedded in a cylinder ring groove formed on the inner surface of the cylinder and slides against the outer surface of the piston when the piston moves axially, or
Is embedded in a piston annular groove formed on an outer surface of the piston and slides against a second axial region of the inner surface of the cylinder upon axial movement of the piston, the first axial region being axially spaced from the second axial region.
2. The low pressure accumulator of claim 1 wherein the first axial region is axially spaced from the second axial region by a distance that has a minimum value of zero.
3. The low pressure accumulator according to claim 1,
the front guide ring and the rear guide ring are both respectively embedded in two cylinder ring grooves formed on an inner surface of the cylinder, or both are respectively embedded in two piston ring grooves formed on an outer surface of the piston and have respective second axial regions axially spaced apart from the first axial regions.
4. The low pressure accumulator of claim 1, wherein the leading ring is embedded in a cylinder ring groove formed on an inner surface of the cylinder, and the trailing ring is embedded in a piston ring groove formed on an outer surface of the piston.
5. The low pressure accumulator of claim 4, wherein the axial spacing between the back guide ring and the seal in the piston annular groove is greater than the axial travel of the piston.
6. The low pressure accumulator of claim 5, wherein the piston has a tapered guide section starting at the first end, the tapered guide section having an axial length greater than a width of the leading ring.
7. The low pressure accumulator according to claim 6, characterized in that the leading ring slides between the conical guide section of the piston and a seal provided on the piston over the entire axial stroke of the piston.
8. The low pressure accumulator of any one of claims 1-7, wherein the seal is sleeved on an outer surface of the piston or embedded within a seal groove formed on the outer surface of the piston.
9. A vehicle braking system comprising a low pressure accumulator according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921721671.1U CN210686792U (en) | 2019-10-15 | 2019-10-15 | Low-pressure accumulator and vehicle brake system comprising a low-pressure accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921721671.1U CN210686792U (en) | 2019-10-15 | 2019-10-15 | Low-pressure accumulator and vehicle brake system comprising a low-pressure accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210686792U true CN210686792U (en) | 2020-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921721671.1U Active CN210686792U (en) | 2019-10-15 | 2019-10-15 | Low-pressure accumulator and vehicle brake system comprising a low-pressure accumulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210686792U (en) |
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2019
- 2019-10-15 CN CN201921721671.1U patent/CN210686792U/en active Active
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