WO2020148253A1 - Anti-lock braking apparatus for vehicle - Google Patents

Anti-lock braking apparatus for vehicle Download PDF

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Publication number
WO2020148253A1
WO2020148253A1 PCT/EP2020/050764 EP2020050764W WO2020148253A1 WO 2020148253 A1 WO2020148253 A1 WO 2020148253A1 EP 2020050764 W EP2020050764 W EP 2020050764W WO 2020148253 A1 WO2020148253 A1 WO 2020148253A1
Authority
WO
WIPO (PCT)
Prior art keywords
shock absorption
fluid
seal
lock braking
braking apparatus
Prior art date
Application number
PCT/EP2020/050764
Other languages
French (fr)
Inventor
Wenying XIONG
Yuhui HE
Xuesong Wang
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to KR2020217000050U priority Critical patent/KR20210002052U/en
Priority to DE112020000431.7T priority patent/DE112020000431T5/en
Priority to JP2021540837A priority patent/JP7368478B2/en
Publication of WO2020148253A1 publication Critical patent/WO2020148253A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4068—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system the additional fluid circuit comprising means for attenuating pressure pulsations

Definitions

  • the present application relates to an anti-lock braking apparatus for a vehicle.
  • a motor vehicle anti-lock braking apparatus mainly comprises a housing and, disposed in the housing, a plunger pump and a shock absorber; the shock absorber is used for mitigating fluid pressure fluctuation in the plunger pump.
  • the plunger pump is used for applying a certain pressure to a fluid, i.e. brake fluid, and supplying the pressurized fluid into a brake of a brake wheel in order to apply a braking force to the brake wheel.
  • a reaction force due to the braking force causes fluid pressure to increase
  • the fluid pressure in a fluid cavity of the plunger pump also correspondingly increases; this pressure, having increased to a certain degree, will be discharged into a shock absorption cavity of the shock absorber via a shock absorption outlet on a plunger sleeve of the plunger pump.
  • Fluid discharged from the shock absorber is discharged via a fluid outlet on the shock absorber into a shock absorption liquid region surrounding the plunger sleeve of the plunger pump, and then discharged from the plunger pump.
  • a sealing apparatus is disposed between an inner surface of the housing and an outer surface of the plunger sleeve mated therewith.
  • a sealing groove is formed in the outer surface of the plunger sleeve, and a seal is installed in the sealing groove.
  • the seal is generally a rubber seal, e.g. a rubber O-ring.
  • the installation of the rubber seal in the sealing groove formed in the outer surface of the plunger sleeve carries the risk of the seal being broken by pulling; furthermore, in the process of the plunger sleeve, with the seal already installed thereon, being installed in a pump installation hole of the housing, the seal protruding from the outer surface of the plunger sleeve might be cut by a sharp edge of the pump installation hole. All of these will have an impact on the sealing result between the plunger pump and the housing, and high-pressure fluid discharged from the plunger pump to the shock absorber might leak into the shock absorption liquid region.
  • An object of the present utility model is to prevent a seal between a plunger pump and a pump installation hole from being broken by pulling or cut, to improve a sealing result between the plunger pump and a housing.
  • the seal may be integrally formed on the outer surface, or may be integrally formed in a sealing groove sunk into the outer surface.
  • the outer surface may comprise a maximum-diameter segment, a tapered transitional segment and a reduced-diameter segment, wherein the tapered transitional segment is connected to both the maximum- diameter segment and the reduced-diameter segment.
  • the seal may be disposed on the maximum-diameter segment or the tapered transitional segment of the outer surface.
  • the motor vehicle anti-lock braking apparatus may further comprise a shock absorber installed in the housing; at the reduced-diameter segment, a shock absorption liquid region may be formed between the inner surface of the pump installation hole and the outer surface of the plunger sleeve, the shock absorption liquid region being used for receiving fluid from the shock absorber.
  • the plunger sleeve may comprise a shock absorption outlet, fluid in the fluid cavity being able to flow to a shock absorption cavity of the shock absorber through the shock absorption outlet; in the installation direction, the seal may be located between the shock absorption outlet and the shock absorption liquid region.
  • the motor vehicle anti-lock braking apparatus may comprise a ball valve, which is disposed at the shock absorption outlet and configured to allow fluid in the fluid cavity to flow to the shock absorber or prohibit fluid in the fluid cavity from flowing to the shock absorber.
  • the housing may have a shock absorption channel formed therein, the shock absorption outlet of the plunger sleeve being in fluid communication with the shock absorption cavity of the shock absorber via the shock absorption channel.
  • the seal may be a rubber seal.
  • the fluid may be brake fluid.
  • the seal between the pump installation hole of the housing and the plunger pump of the motor vehicle anti-lock braking apparatus is integrally formed on the outer surface of the plunger sleeve of the plunger pump or in the sealing groove sunk into the outer surface.
  • the seal may be disposed on the reduced-diameter segment of the outer surface of the plunger sleeve, such that in the process of installing the plunger pump in the pump installation hole, the risk of the seal being cut by a sharp edge of the pump installation hole is avoided.
  • Fig. 1 shows a sectional view of a part of the anti-lock braking apparatus according to a first embodiment of the present utility model, wherein the ball valve at the shock absorption outlet of the plunger pump is in a closed state;
  • fig. 2 is a partial enlarged drawing of a part of fig. 1 when the ball valve at the shock absorption outlet of the plunger pump is in an open state; and fig. 3 is a drawing of a second embodiment corresponding to fig. 2, according to the present utility model.
  • Fig. 1 shows a sectional view of a part of the anti-lock braking apparatus according to the present utility model.
  • the anti-lock braking apparatus mainly comprises a housing 10 and, accommodated in the housing 10, a plunger pump 50 and a shock absorber 80.
  • the housing 10 defines a pump installation hole 20 having an inner surface; the plunger pump 50 is installed in this pump installation hole 20 in an installation direction D.
  • the plunger pump 50 comprises a plunger sleeve 52; the plunger sleeve 52 defines a fluid cavity 54 allowing fluid to be pressurized therein, and comprises an outer surface 51 opposite the inner surface of the pump installation hole 20.
  • the plunger sleeve 52 comprises a fluid outlet (not shown) allowing pressurized fluid to be supplied to a wheel brake installed on a wheel, and a shock absorption outlet 62 allowing pressurized fluid to flow to the shock absorber 80.
  • Fig. 1 shows a ball valve 70 disposed at the shock absorption outlet 62, wherein the ball valve 70, when in an open state (as shown in figs.
  • the outer surface 51 of the plunger sleeve 52 of the plunger pump 50 sequentially comprises a maximum-diameter segment 51a having a maximum diameter, a tapered transitional segment 51b and a reduced-diameter segment 51c; the tapered transitional segment 51b is connected to both the maximum-diameter segment 51a and the reduced-diameter segment 51c.
  • a sealing groove 72 is formed on the maximum-diameter segment 51a of the plunger sleeve 52, the sealing groove extending circumferentially around the plunger sleeve 52 and being sunk into the outer surface 51 of the plunger sleeve 52, and a seal 74 is integrally formed in the sealing groove 72.
  • the seal 74 may be a rubber seal or any other known seal in the art.
  • An outermost diameter of the seal 74 is slightly greater than a maximum external diameter of the outer surface 51 of the plunger sleeve 52 and greater than an internal diameter of the pump installation hole 22, such that when the plunger sleeve 52 with the integrally formed seal 74 is installed in the pump installation hole 20, the seal 74 is squeezed by the inner surface of the pump installation hole 20 and performs sealing between the outer surface 51 of the plunger sleeve 52 and the inner surface of the pump installation hole 20.
  • a shock absorption liquid region 90 is also formed between the plunger sleeve 52 and the inner surface of the pump installation hole 20; the shock absorption liquid region 90 is an annular gap belt around the outer surface 51 of the plunger sleeve 52. Fluid from the shock absorption cavity 82 of the shock absorber 80 is discharged via a fluid outlet 84 of the shock absorber 80 and this shock absorption liquid region 90.
  • fluid specifically brake fluid is pressurized in the fluid cavity 54 formed by the plunger sleeve 52 of the plunger pump 50, and the pressurized fluid is supplied via the fluid outlet to a brake cylinder of a wheel brake, in order to apply a braking force to a corresponding brake wheel.
  • the pressure of brake fluid in the brake at the single brake wheel increases, and due to counteraction, the pressure of brake fluid in the fluid cavity 54 in the plunger pump 50 also increases.
  • the ball valve 70 of the plunger pump 50 When this pressure increases to a particular preset critical value, the ball valve 70 of the plunger pump 50 is opened, and brake fluid flows to the shock absorption cavity 82 of the shock absorber 80 via the ball valve 70, the shock absorption outlet 62, and a shock absorption channel 15 formed in the housing 10.
  • the fluid of the shock absorber 80 is discharged via the fluid outlet 84 and the shock absorption liquid region 90, as stated above.
  • the seal 74 and the sealing groove 72 located on the outer surface 51 of the plunger sleeve 52 are located between the shock absorption outlet 62 of the plunger sleeve 52 and the shock absorption liquid region 90, and have the effect of effectively preventing high-pressure fluid, which has flowed out of the plunger pump 50 via the shock absorption outlet 62, from leaking into the shock absorption liquid region 90 through a gap between the outer surface 51 of the plunger sleeve 52 and the inner surface of the pump installation hole 20.
  • the seal 74 is integrally formed in the sealing groove 72 formed in the outer surface 51 of the plunger sleeve 52, and there is no longer any need for the step of installing the seal 74 of rubber material in the sealing groove as in the prior art; thus, the risk that the seal 74 will itself be broken by pulling, torn, or cut by a sharp edge of the sealing groove when the seal 74 is installed in that step is avoided.
  • Fig. 3 shows a second embodiment according to the present utility model. This embodiment differs from the first embodiment in that: the seal is not disposed on the maximum- diameter segment 51a of the outer surface 51 of the plunger sleeve 52, but instead is disposed on the tapered transitional segment 51b between the maximum-diameter segment 51a and the reduced-diameter segment 51c at the shock absorption liquid region 90, as shown in fig. 3.
  • the outer surface 51 of the plunger sleeve 52 is not formed with a sealing groove that is sunk into the outer surface 51 and used for receiving the seal 74; instead, the seal 74 is integrally formed on the tapered transitional segment 51b of the outer surface 51 directly, and at the same time, the outermost diameter of the seal 74 is still slightly greater than the maximum external diameter of the outer surface 51 and slightly greater than the internal diameter of the pump installation hole 20, in order to achieve the same sealing effect as the first embodiment in fig. 2.
  • a sealing groove for receiving a part of the seal 74 may also be provided.
  • This second embodiment offers the advantage of eliminating the machining step of machining a sealing groove; furthermore, when the plunger sleeve 52 with the seal 74 having this structure is installed in the pump installation hole 20, cutting by an end edge of the pump installation hole 20 will occur even less easily, hence the seal 74 can be better protected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Regulating Braking Force (AREA)
  • Sealing Devices (AREA)

Abstract

The present invention relates to an anti-lock braking apparatus for a vehicle, comprising: a housing (10), defining a pump installation hole (20) having an inner surface; a plunger pump (50) configured to be installed in the pump installation hole (20) in an installation direction (D), the plunger pump comprising a plunger sleeve (52) which has an outer surface (51) facing the inner surface and defines a fluid cavity (54), wherein the plunger sleeve (52) comprises a seal (74) integrally formed on the outer surface (51), an outermost diameter of the seal (74) being slightly greater than a maximum external diameter of the outer surface (51) and slightly greater than an internal diameter of the inner surface of the pump installation hole (20).

Description

Anti-lock braking apparatus for vehicle
Technical field
The present application relates to an anti-lock braking apparatus for a vehicle.
Background art
A motor vehicle anti-lock braking apparatus mainly comprises a housing and, disposed in the housing, a plunger pump and a shock absorber; the shock absorber is used for mitigating fluid pressure fluctuation in the plunger pump.
The plunger pump is used for applying a certain pressure to a fluid, i.e. brake fluid, and supplying the pressurized fluid into a brake of a brake wheel in order to apply a braking force to the brake wheel. When a reaction force due to the braking force causes fluid pressure to increase, the fluid pressure in a fluid cavity of the plunger pump also correspondingly increases; this pressure, having increased to a certain degree, will be discharged into a shock absorption cavity of the shock absorber via a shock absorption outlet on a plunger sleeve of the plunger pump. Fluid discharged from the shock absorber is discharged via a fluid outlet on the shock absorber into a shock absorption liquid region surrounding the plunger sleeve of the plunger pump, and then discharged from the plunger pump.
In this structure, a sealing apparatus is disposed between an inner surface of the housing and an outer surface of the plunger sleeve mated therewith. In general, a sealing groove is formed in the outer surface of the plunger sleeve, and a seal is installed in the sealing groove. The seal is generally a rubber seal, e.g. a rubber O-ring.
However, the installation of the rubber seal in the sealing groove formed in the outer surface of the plunger sleeve carries the risk of the seal being broken by pulling; furthermore, in the process of the plunger sleeve, with the seal already installed thereon, being installed in a pump installation hole of the housing, the seal protruding from the outer surface of the plunger sleeve might be cut by a sharp edge of the pump installation hole. All of these will have an impact on the sealing result between the plunger pump and the housing, and high-pressure fluid discharged from the plunger pump to the shock absorber might leak into the shock absorption liquid region.
It is hoped that this technical problem can be solved.
Content of the utility model
An object of the present utility model is to prevent a seal between a plunger pump and a pump installation hole from being broken by pulling or cut, to improve a sealing result between the plunger pump and a housing.
To this end, an anti-lock braking apparatus for a vehicle is provided, comprising: a housing, defining a pump installation hole having an inner surface; a plunger pump configured to be installed in the pump installation hole in an installation direction, the plunger pump comprising a plunger sleeve which has an outer surface facing the inner surface and defines a fluid cavity, wherein the plunger sleeve comprises a seal integrally formed on the outer surface, an outermost diameter of the seal being slightly greater than a maximum external diameter of the outer surface and slightly greater than an internal diameter of the inner surface of the pump installation hole. The seal may be integrally formed on the outer surface, or may be integrally formed in a sealing groove sunk into the outer surface.
In one embodiment, in the installation direction, the outer surface may comprise a maximum-diameter segment, a tapered transitional segment and a reduced-diameter segment, wherein the tapered transitional segment is connected to both the maximum- diameter segment and the reduced-diameter segment. The seal may be disposed on the maximum-diameter segment or the tapered transitional segment of the outer surface.
In one embodiment, the motor vehicle anti-lock braking apparatus may further comprise a shock absorber installed in the housing; at the reduced-diameter segment, a shock absorption liquid region may be formed between the inner surface of the pump installation hole and the outer surface of the plunger sleeve, the shock absorption liquid region being used for receiving fluid from the shock absorber. The plunger sleeve may comprise a shock absorption outlet, fluid in the fluid cavity being able to flow to a shock absorption cavity of the shock absorber through the shock absorption outlet; in the installation direction, the seal may be located between the shock absorption outlet and the shock absorption liquid region. The motor vehicle anti-lock braking apparatus may comprise a ball valve, which is disposed at the shock absorption outlet and configured to allow fluid in the fluid cavity to flow to the shock absorber or prohibit fluid in the fluid cavity from flowing to the shock absorber. The housing may have a shock absorption channel formed therein, the shock absorption outlet of the plunger sleeve being in fluid communication with the shock absorption cavity of the shock absorber via the shock absorption channel. The seal may be a rubber seal. The fluid may be brake fluid.
According to the present utility model, the seal between the pump installation hole of the housing and the plunger pump of the motor vehicle anti-lock braking apparatus is integrally formed on the outer surface of the plunger sleeve of the plunger pump or in the sealing groove sunk into the outer surface. Thus, the operating step of installing a separate seal on the outer surface of the plunger sleeve or in the sealing groove formed on the outer surface is avoided, and therefore the risk of the seal being consequently broken by pulling is eliminated. The seal may be disposed on the reduced-diameter segment of the outer surface of the plunger sleeve, such that in the process of installing the plunger pump in the pump installation hole, the risk of the seal being cut by a sharp edge of the pump installation hole is avoided.
Description of the accompanying drawings
A better understanding of the above and other features and advantages of the present utility model will be gained from particular embodiments described with reference to the accompanying drawings. The drawings are not drawn to scale, and are intended only to serve an explanatory purpose, not to restrict the scope of the present utility model. Thus, it should be understood that the components shown in the drawings are not necessarily present in all anti-lock braking apparatuses; components which are not shown in the drawings might be present in some anti-lock braking apparatuses. Here:
Fig. 1 shows a sectional view of a part of the anti-lock braking apparatus according to a first embodiment of the present utility model, wherein the ball valve at the shock absorption outlet of the plunger pump is in a closed state;
fig. 2 is a partial enlarged drawing of a part of fig. 1 when the ball valve at the shock absorption outlet of the plunger pump is in an open state; and fig. 3 is a drawing of a second embodiment corresponding to fig. 2, according to the present utility model.
Particular embodiments
The anti-lock braking apparatus for a vehicle according to the present utility model is described in detail below with reference to the accompanying drawings.
Fig. 1 shows a sectional view of a part of the anti-lock braking apparatus according to the present utility model. As shown in fig. 1, the anti-lock braking apparatus mainly comprises a housing 10 and, accommodated in the housing 10, a plunger pump 50 and a shock absorber 80. For this purpose, the housing 10 defines a pump installation hole 20 having an inner surface; the plunger pump 50 is installed in this pump installation hole 20 in an installation direction D.
The plunger pump 50 comprises a plunger sleeve 52; the plunger sleeve 52 defines a fluid cavity 54 allowing fluid to be pressurized therein, and comprises an outer surface 51 opposite the inner surface of the pump installation hole 20. The plunger sleeve 52 comprises a fluid outlet (not shown) allowing pressurized fluid to be supplied to a wheel brake installed on a wheel, and a shock absorption outlet 62 allowing pressurized fluid to flow to the shock absorber 80. Fig. 1 shows a ball valve 70 disposed at the shock absorption outlet 62, wherein the ball valve 70, when in an open state (as shown in figs. 2 and 3), allows pressurized fluid to flow via the shock absorption outlet 62 to a shock absorption cavity 82 defined by the shock absorber 80, and when in a closed state (as shown in fig. 1), prohibits pressurized fluid from flowing via the shock absorption outlet 62 to the shock absorption cavity 82 of the shock absorber 80.
In the installation direction D, the outer surface 51 of the plunger sleeve 52 of the plunger pump 50 sequentially comprises a maximum-diameter segment 51a having a maximum diameter, a tapered transitional segment 51b and a reduced-diameter segment 51c; the tapered transitional segment 51b is connected to both the maximum-diameter segment 51a and the reduced-diameter segment 51c.
In the first embodiment shown in figs. 1 and 2, a sealing groove 72 is formed on the maximum-diameter segment 51a of the plunger sleeve 52, the sealing groove extending circumferentially around the plunger sleeve 52 and being sunk into the outer surface 51 of the plunger sleeve 52, and a seal 74 is integrally formed in the sealing groove 72. Specifically, the seal 74 may be a rubber seal or any other known seal in the art. An outermost diameter of the seal 74 is slightly greater than a maximum external diameter of the outer surface 51 of the plunger sleeve 52 and greater than an internal diameter of the pump installation hole 22, such that when the plunger sleeve 52 with the integrally formed seal 74 is installed in the pump installation hole 20, the seal 74 is squeezed by the inner surface of the pump installation hole 20 and performs sealing between the outer surface 51 of the plunger sleeve 52 and the inner surface of the pump installation hole 20.
On the tapered transitional segment 51b and the reduced-diameter segment 51c of the outer surface 51, a shock absorption liquid region 90 is also formed between the plunger sleeve 52 and the inner surface of the pump installation hole 20; the shock absorption liquid region 90 is an annular gap belt around the outer surface 51 of the plunger sleeve 52. Fluid from the shock absorption cavity 82 of the shock absorber 80 is discharged via a fluid outlet 84 of the shock absorber 80 and this shock absorption liquid region 90.
During operation, fluid, specifically brake fluid is pressurized in the fluid cavity 54 formed by the plunger sleeve 52 of the plunger pump 50, and the pressurized fluid is supplied via the fluid outlet to a brake cylinder of a wheel brake, in order to apply a braking force to a corresponding brake wheel. As the braking action is applied to the brake wheel, the pressure of brake fluid in the brake at the single brake wheel increases, and due to counteraction, the pressure of brake fluid in the fluid cavity 54 in the plunger pump 50 also increases. When this pressure increases to a particular preset critical value, the ball valve 70 of the plunger pump 50 is opened, and brake fluid flows to the shock absorption cavity 82 of the shock absorber 80 via the ball valve 70, the shock absorption outlet 62, and a shock absorption channel 15 formed in the housing 10. The fluid of the shock absorber 80 is discharged via the fluid outlet 84 and the shock absorption liquid region 90, as stated above.
According to a first embodiment of the present utility model, in the installation direction D of the plunger pump 50, the seal 74 and the sealing groove 72 located on the outer surface 51 of the plunger sleeve 52 are located between the shock absorption outlet 62 of the plunger sleeve 52 and the shock absorption liquid region 90, and have the effect of effectively preventing high-pressure fluid, which has flowed out of the plunger pump 50 via the shock absorption outlet 62, from leaking into the shock absorption liquid region 90 through a gap between the outer surface 51 of the plunger sleeve 52 and the inner surface of the pump installation hole 20.
According to the principles of the present utility model, the seal 74 is integrally formed in the sealing groove 72 formed in the outer surface 51 of the plunger sleeve 52, and there is no longer any need for the step of installing the seal 74 of rubber material in the sealing groove as in the prior art; thus, the risk that the seal 74 will itself be broken by pulling, torn, or cut by a sharp edge of the sealing groove when the seal 74 is installed in that step is avoided.
Fig. 3 shows a second embodiment according to the present utility model. This embodiment differs from the first embodiment in that: the seal is not disposed on the maximum- diameter segment 51a of the outer surface 51 of the plunger sleeve 52, but instead is disposed on the tapered transitional segment 51b between the maximum-diameter segment 51a and the reduced-diameter segment 51c at the shock absorption liquid region 90, as shown in fig. 3.
In this embodiment, the outer surface 51 of the plunger sleeve 52 is not formed with a sealing groove that is sunk into the outer surface 51 and used for receiving the seal 74; instead, the seal 74 is integrally formed on the tapered transitional segment 51b of the outer surface 51 directly, and at the same time, the outermost diameter of the seal 74 is still slightly greater than the maximum external diameter of the outer surface 51 and slightly greater than the internal diameter of the pump installation hole 20, in order to achieve the same sealing effect as the first embodiment in fig. 2. Optionally, in this embodiment, a sealing groove for receiving a part of the seal 74 may also be provided.
This second embodiment offers the advantage of eliminating the machining step of machining a sealing groove; furthermore, when the plunger sleeve 52 with the seal 74 having this structure is installed in the pump installation hole 20, cutting by an end edge of the pump installation hole 20 will occur even less easily, hence the seal 74 can be better protected.
Although the present utility model has been described here with reference to the particular embodiments shown in the figures, the scope of the present utility model is not limited to the details which are described above and shown in the figures. Various amendments may be made to these details without departing from the basic principles of the present utility model.

Claims

Claims
1. Anti-lock braking apparatus for a vehicle, comprising:
a housing (10), defining a pump installation hole (20) having an inner surface;
a plunger pump (50) configured to be installed in the pump installation hole (20) in an installation direction (D), the plunger pump comprising a plunger sleeve (52) which has an outer surface (51) facing the inner surface and defines a fluid cavity (54),
characterized in that the plunger sleeve (52) comprises a seal (74) integrally formed on the outer surface (51), an outermost diameter of the seal (74) being slightly greater than a maximum external diameter of the outer surface (51) and slightly greater than an internal diameter of the inner surface of the pump installation hole (20).
2. Anti-lock braking apparatus according to Claim 1, characterized in that the seal (74) is integrally formed on the outer surface (51), or integrally formed in a sealing groove (72) sunk into the outer surface (51).
3. Anti-lock braking apparatus according to Claim 1, characterized in that in the installation direction (D), the outer surface (51) comprises a maximum-diameter segment (51a), a tapered transitional segment (51b) and a reduced-diameter segment (51c), wherein the tapered transitional segment (51b) is connected to both the maximum-diameter segment (51a) and the reduced-diameter segment (51c).
4. Anti-lock braking apparatus according to Claim 3, characterized in that the seal (74) is disposed on the maximum-diameter segment (51a) or the tapered transitional segment (51b) of the outer surface (51).
5. Anti-lock braking apparatus according to Claim 4, characterized in that the anti-lock braking apparatus further comprises a shock absorber (80) installed in the housing (10); at the reduced-diameter segment (51c), a shock absorption liquid region (90) is formed between the inner surface of the pump installation hole (20) and the outer surface (51) of the plunger sleeve (52), the shock absorption liquid region being used for receiving fluid from the shock absorber (80).
6. Anti-lock braking apparatus according to Claim 5, characterized in that the plunger sleeve (52) comprises a shock absorption outlet (62), fluid in the fluid cavity (54) being able to flow to a shock absorption cavity (82) of the shock absorber (80) through the shock absorption outlet (62); in the installation direction (D), the seal (74) is located between the shock absorption outlet (62) and the shock absorption liquid region (90).
7. Anti-lock braking apparatus according to Claim 6, characterized in that the anti-lock braking apparatus comprises a ball valve (70), which is disposed at the shock absorption outlet (62) and configured to allow fluid in the fluid cavity (54) to flow to the shock absorber (80) or prohibit fluid in the fluid cavity from flowing to the shock absorber.
8. Anti-lock braking apparatus according to Claim 6, characterized in that the housing (10) has a shock absorption channel (15) formed therein, the shock absorption outlet (62) of the plunger sleeve (52) being in fluid communication with the shock absorption cavity (82) of the shock absorber (80) via the shock absorption channel (15).
9. Anti-lock braking apparatus according to any one of Claims 1 - 6, characterized in that the seal (74) is a rubber seal.
10. Anti-lock braking apparatus according to any one of Claims 1 - 6, characterized in that the fluid is brake fluid.
PCT/EP2020/050764 2019-01-15 2020-01-14 Anti-lock braking apparatus for vehicle WO2020148253A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR2020217000050U KR20210002052U (en) 2019-01-15 2020-01-14 Anti-lock braking apparatus for vehicle
DE112020000431.7T DE112020000431T5 (en) 2019-01-15 2020-01-14 Anti-lock braking device for a vehicle
JP2021540837A JP7368478B2 (en) 2019-01-15 2020-01-14 Anti-lock brake device for vehicles

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EP1591659A1 (en) * 2004-04-27 2005-11-02 Robert Bosch Gmbh Piston pump with improved guidance
CN202294769U (en) * 2011-10-12 2012-07-04 芜湖众力部件有限公司 Air valve seat of automobile vacuum booster
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WO2018109576A1 (en) * 2016-12-12 2018-06-21 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Hydraulic control unit for vehicle brake system

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DE112020000431T5 (en) 2021-09-30
JP2022517038A (en) 2022-03-03
JP7368478B2 (en) 2023-10-24

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