WO2022088174A1 - 驻车制动***用致动机构 - Google Patents

驻车制动***用致动机构 Download PDF

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Publication number
WO2022088174A1
WO2022088174A1 PCT/CN2020/125822 CN2020125822W WO2022088174A1 WO 2022088174 A1 WO2022088174 A1 WO 2022088174A1 CN 2020125822 W CN2020125822 W CN 2020125822W WO 2022088174 A1 WO2022088174 A1 WO 2022088174A1
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WO
WIPO (PCT)
Prior art keywords
passage
outer sleeve
brake system
actuating mechanism
parking brake
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Application number
PCT/CN2020/125822
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English (en)
French (fr)
Inventor
郑飞翔
Original Assignee
舍弗勒技术股份两合公司
郑飞翔
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Application filed by 舍弗勒技术股份两合公司, 郑飞翔 filed Critical 舍弗勒技术股份两合公司
Priority to PCT/CN2020/125822 priority Critical patent/WO2022088174A1/zh
Publication of WO2022088174A1 publication Critical patent/WO2022088174A1/zh

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    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position

Definitions

  • the present invention relates to the field of parking of vehicles, in particular to an actuating mechanism for a parking brake system of a vehicle.
  • Existing actuation mechanisms for parking brake systems for vehicles include a housing and a piston assembly partially within the housing. Under the action of the high-pressure oil introduced into the oil cavity of the casing, the piston assembly can overcome the spring force of the return spring and move relative to the casing toward one side along the axial direction of the casing; After the oil is discharged through the gap between the piston assembly and the casing, under the action of the spring force of the return spring, the piston assembly can move relative to the casing toward the other side along the axial direction of the casing. In this way, the reciprocating motion of the piston assembly relative to the housing is realized, so that the pawl outside the actuating mechanism can be driven to engage and disengage from the gear of the transmission to realize and release the parking brake function.
  • the pressure of the high-pressure oil introduced into the oil cavity of the casing is relatively high (for example, 10bar-40bar), and the high-pressure oil in the oil cavity and/or the high-pressure oil mixed into the high-pressure oil has a high pressure.
  • Air especially the air that enters the oil chamber after the vehicle stops working, will be expelled through the gap between the piston assembly and the casing at a very high speed (kinetic energy), and the expelled oil and/or air will hit other components in the transmission. components, which may cause damage to these components, causing them to malfunction.
  • the present invention is made in view of the above-mentioned defects of the prior art.
  • the object of the present invention is to provide an actuating mechanism for a parking brake system, which can not only avoid the problem that sufficient oil pressure cannot be established in the oil cavity of the housing due to the ever-increasing gap between the piston assembly and the housing. problems, and also reduces the chance of failure of other components of the transmission caused by the shock of oil and/or air expelled from the actuating mechanism.
  • the present invention provides an actuating mechanism for a parking brake system as follows, the actuating mechanism for a parking brake system includes:
  • a housing formed with a first channel and a second channel independent of each other;
  • a piston assembly at least a part of the piston assembly is located inside the casing, so as to separate an oil chamber in the interior of the casing that is in communication with the first passage and the second passage, and utilizes the The medium introduced into the oil chamber by the first passage can push the piston assembly to move relative to the housing;
  • a discharge assembly fixed with respect to the housing and formed with a labyrinth passage communicating with the second passage, so that the medium discharged through the second passage and/or mixed into the The air of the medium can enter the labyrinth passage, and then be discharged to the outside of the actuating mechanism for the parking brake system via the labyrinth passage.
  • the discharge assembly further comprises a one-way valve that only allows the medium and/or the air to enter the labyrinth passage from the second passage.
  • the one-way valve is provided between the labyrinth passage and the second passage.
  • the discharge assembly further comprises:
  • the inner sleeve is located inside the outer sleeve in a coaxial manner with the outer sleeve and is fixed relative to the outer sleeve;
  • the labyrinth channel is formed between the outer sleeve and the inner sleeve.
  • the inner sleeve includes:
  • a skeleton portion formed in a cylindrical shape having a skeleton bottom facing the opening of the second passage and through which the skeleton flowing out through the second passage is guided by the skeleton bottom the medium and/or the air flow to the labyrinth channel between the inner sleeve and the outer sleeve;
  • the elastic portion includes a plurality of circumferential protrusions extending along the circumferential direction of the inner sleeve and spaced apart from each other in the axial direction of the inner sleeve, the plurality of circumferential protrusions The radially outer ends of the ridges abut against the outer sleeve, each of the circumferential protrusions is formed with at least one gap, and the gaps of adjacent circumferential protrusions are located at different positions in the circumferential direction; or
  • the elastic portion includes at least one helical protrusion extending continuously spirally around the outer circumference of the skeleton portion, and radially outer ends of the helical protrusion are all abutted against the outer sleeve.
  • the elastic portion further includes a sealing lip, the sealing lip extending continuously along the circumferential direction of the inner sleeve, and the sealing lip extending toward the radially outer side of the skeleton portion while facing away from The direction of the second passage extends so that the sealing lip can contact and seal with the outer sleeve, and the sealing lip acts as a one-way valve between the labyrinth passage and the second passage.
  • the housing is formed with a protrusion protruding toward the bottom of the skeleton in a portion surrounded by the outer sleeve, and the bottom of the skeleton is pressed against the protrusion so that the bottom of the skeleton is spaced from the opening of the second channel.
  • the skeleton part is made of metal
  • the elastic part is made of rubber, silica gel or plastic
  • the elastic part is fixed to the skeleton part by vulcanization molding.
  • the outer sleeve is integrally formed with the housing.
  • the discharge assembly further comprises a fixing cover fixed to the outer sleeve, the fixing cover comprising:
  • cover body is sleeved on the outer sleeve
  • a cover bottom which is fixed to the cover body and is formed with a through hole communicating with the labyrinth channel, so that the medium and/or the air flowing out through the labyrinth channel can be discharged from the through hole to the outside of the actuating mechanism for the parking brake system;
  • the present invention provides a novel actuating mechanism for a parking brake system, which includes a housing, a piston assembly capable of moving relative to the housing in the housing, and a discharge assembly.
  • the housing is formed with a first channel and a second channel communicating with its inner oil chamber, through which high-pressure oil can be introduced into the oil chamber to push the piston assembly, and a medium (eg, oil) in the oil chamber can be introduced through the second channel and/or the air mixed with the oil is exhausted.
  • the discharge assembly is fixed relative to the housing and is formed with a labyrinth passage communicating with the second passage, through which the medium and/or air discharged through the second passage can be discharged to the outside of the actuating mechanism.
  • the labyrinth passage will not increase in size with the operation of the actuating mechanism, thereby avoiding the need for the oil chamber described in the background art.
  • FIG. 1 is a schematic cross-sectional view showing an actuating mechanism for a parking brake system according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing a partial structure of the actuating mechanism for the parking brake system in FIG. 1 .
  • FIG. 3 is a schematic perspective view showing a partial structure of the actuating mechanism for the parking brake system in FIG. 1 .
  • FIG. 4 is a schematic perspective view showing the structure of the inner sleeve of the actuating mechanism for the parking brake system in FIG. 1 .
  • FIG. 5 is a schematic perspective view showing the structure of the fixing cover of the actuating mechanism for the parking brake system in FIG. 1 .
  • the axial, radial and circumferential directions refer to the axial, radial and Circumferential; "one axial side” refers to the left side in Figures 1, 2, and 4, and “the other side in the axial direction” refers to the right side in Figures 1, 2, and 4; “radial outer side” ” refers to the side remote from the central axis of the inner and outer sleeves, and “radially inboard” refers to the side closer to the central axis of the inner and outer sleeves.
  • an actuating mechanism for a parking brake system includes a housing 1 , a piston assembly 2 , a discharge assembly 3 , a return spring 4 and a lock assembly 5 assembled together.
  • the housing 1 includes a main body part 11 and a cover part 12 assembled together.
  • the main body 11 is formed in a substantially cylindrical shape, one end (the left end in FIG. 1 ) has a bottom, and the other end (the right end in FIG. 1 ) is formed with an opening, and the cover 12 closes the main body
  • the main body part 11 is assembled to the main body part 11 in the manner of opening of the part 11 so that the main body part 11 and the cover part 12 surround the inner space forming a predetermined volume.
  • a first channel 11h1 that communicates with the internal space is formed at one end of the cylindrical body of the main body 11 , and a portion of the bottom of the main body 11 away from the first channel 11h1 is formed to penetrate the bottom and communicate with the internal space. of the second channel 11h2.
  • the first passage 11h1 and the second passage 11h2 are independent of each other and spaced apart sufficiently so that the high-pressure oil introduced into the interior of the casing 1 via the first passage 11h1 is not discharged from the second passage 11h2 too quickly.
  • a hole into which the lock pin 52 of the lock assembly 5 is inserted into the casing 1 is formed in a substantially central portion of the cylindrical body of the main body portion 11 .
  • the cover portion 12 is formed with a hole penetrating the cover portion 12 and through which a part of the piston 21 protrudes to the outside of the housing 1. As shown in FIG.
  • a part of the piston assembly 2 is located inside the housing 1 , and the other part protrudes to the outside of the housing 1 through a hole formed in the cover part 12 .
  • the piston assembly 2 includes a piston 21 and a sealing ring 22 assembled together.
  • the piston 21 can reciprocate in the housing 1 along the axial direction of the cylindrical body of the housing 1, and the sealing ring 22 is sleeved on the outer periphery of the piston 21 and is located between the piston 21 and the cylindrical body of the housing 1 to achieve The seal between the piston 21 and the body portion 11 of the housing 1 .
  • the space between one side end of the piston 21 and the bottom of the housing 1 is formed as an oil chamber 1s communicating with both the first passage 11h1 and the second passage 11h2, and high-pressure oil can be introduced into the oil via the first passage 11h1 In the cavity 1s, the oil in the oil cavity 1s and/or the air mixed into the oil can be discharged from the oil cavity 1s through the second passage 11h2.
  • two locking grooves 21c are formed on the outer peripheral portion of the piston 21 on the other side of the portion where the sealing ring 22 is mounted. The piston 21 is locked in two different positions, and the two different positions respectively implement the parking brake function and release the parking brake function.
  • the discharge assembly 3 is installed at the part of the casing 1 where the second passage 11h2 is formed, and the labyrinth passage 3s formed by the discharge assembly 3 is connected to the The second passage 11h2 communicates so that the oil and/or air discharged via the second passage 11h2 can be discharged to the outside of the actuating mechanism through the labyrinth passage 3s.
  • the discharge assembly 3 includes an outer sleeve 31 , an inner sleeve 32 and a fixed cover 33 assembled together.
  • the outer sleeve 31 is integrally formed with the main body portion 11 of the casing 1 in such a manner as to surround the opening 11p of the second passage 11h2 leading to the outside of the casing 1, and the outer sleeve 31 extends from The main body portion 11 of the housing 1 extends toward one side in the axial direction by a sufficient length.
  • the outer peripheral portion of the outer sleeve 31 is formed with a male screw portion 31 t that is screwed with a female screw portion 331 t of the fixing cover 33 to be described later.
  • the axial one side end face of the bottom portion of the casing 1 is formed with a skeleton bottom 3212 facing the axial side (towards the below-described skeleton bottom portion 3212 of the inner sleeve 32)
  • the protruding one or more protrusions 1p are spaced apart from the opening 11p of the second passage 11h2 without blocking the second The opening 11p of the passage 11h2 will not affect the outflow of oil and/or air in the oil chamber Is through the second passage 11h2.
  • the inner sleeve 32 is located inside the outer sleeve 31 in a coaxial manner with the outer sleeve 31 and is fixed to the outer sleeve 31 and the housing 1 through the fixing cover 33 , in the radial direction R
  • a labyrinth passage 3s is formed between the outer peripheral portion of the inner sleeve 32 and the inner peripheral portion of the outer sleeve 31 which are opposed to each other.
  • the inner sleeve 32 includes a skeleton part 321 and an elastic part 322 fixed together.
  • the frame portion 321 is made of metal and the elastic portion 322 is made of rubber, silicone or plastic, and the elastic portion 322 is fixed to the outer peripheral portion of the frame portion 321 by, for example, vulcanization molding.
  • the skeleton part 321 includes a skeleton body 3211 and a skeleton bottom part 3212 formed as one body, the skeleton body 3211 is formed in a cylindrical shape, and the skeleton bottom part 3212 is located at the other axial end of the skeleton body 3211 to close the axial other side of the skeleton body 3211 end.
  • the outer diameter of the skeleton body 3211 is smaller than the inner diameter of the outer sleeve 31 to leave a sufficient space between the skeleton body 3211 and the outer sleeve 31 in the radial direction R to accommodate the elastic portion 322 .
  • the skeleton bottom 3212 faces the opening 11p of the second passage 11h2, and the stopping and guiding action of the skeleton bottom 3212 is used to make the medium and/or air flow through the second passage 11h2 to the inner sleeve 32 and the outer casing Labyrinth passages 3s between the cylinders 31.
  • the skeleton bottom 3212 is pressed against the protrusion 1p formed at the bottom of the housing 1 by the fixing cover 33, so that the skeleton bottom 3212 is spaced apart from the opening 11p of the second passage 11h2 without closing the second passage 11h2 opening 11p.
  • the elastic portion 322 is formed to protrude from the outer peripheral portion of the skeleton portion 321 toward the inner peripheral portion of the outer sleeve 31 and abut the outer sleeve 31 , and the elastic portion 322 and the outer sleeve 31 form a labyrinth channel 3 s.
  • the elastic portion 322 includes four circumferential protrusions 3221 extending along the circumferential direction and spaced apart from each other in the axial direction A, and radially outer ends of the four circumferential protrusions 3221 abut against the outer sleeve The inner circumference of 31.
  • Each circumferential protrusion 3221 is formed with a notch 3221c, so that the passages on both sides of each circumferential protrusion 3221 communicate with each other through the notch 3221c.
  • the notches 3221c of adjacent circumferential protrusions 3221 are located at different positions in the circumferential direction.
  • the elastic portion 322 further includes a sealing lip 3222 located on the other end of the skeleton portion 321 in the axial direction, and the sealing lip 3222 is located on the other side in the axial direction than all the circumferential protrusions 3221.
  • the seal lip 3222 extends continuously in the circumferential direction, and the seal lip 3222 extends toward the axial side (towards the direction away from the second passage 11h2 ) while extending toward the radially outer side of the skeleton portion 321 , so that the seal lip 3222 can be connected with
  • the outer sleeve 31 achieves a contact seal.
  • the passage between the sealing lip 3222 and the four circumferential projections 3221 constitutes the labyrinth channel 3s.
  • the sealing lip 3222 also serves as a one-way valve leading from the second passage 11h2 of the housing 1 to the labyrinth passage 3s, and the above-mentioned structure of the sealing lip 3222 allows only the oil and/or air in the oil chamber 1s to pass from the second passage 11h2 to the labyrinth passage 3s.
  • the second passage 11h2 enters the labyrinth passage 3s, and does not allow the oil and/or air in the labyrinth passage 3s to return to the second passage 11h2, and the one-way valve also acts as a preventer to prevent dust from the outside of the actuating mechanism from entering the interior of the housing 1 dust effect.
  • the fixing cover 33 is fixed to the outer sleeve 31 by screwing with the outer sleeve 31 while pressing the inner sleeve 32 to the inside of the outer sleeve 31 , so that the inner sleeve 32 is It is relatively fixed in a coaxial manner with the outer sleeve 31 .
  • the fixed cover 33 includes a cover main body 331 , a cover bottom 332 , and an abutting portion 333 that are formed integrally.
  • the cap main body 331 has a cylindrical shape, and an inner peripheral portion of the cap main body 331 is formed with a female screw portion 331 t that fits with the male screw portion 31 t of the outer sleeve 31 .
  • the fixing cover 33 is fixed to the outer sleeve 31 in a manner of being fitted over the outer sleeve 31 by screwing the above-mentioned male thread portion 31 t and the female thread portion 331 t to each other.
  • the cover bottom 332 is located at one axial end of the cover main body 331, and the cover bottom 332 is formed with, for example, four through holes 332h penetrating the cover bottom 332, so that the medium and/or air passing through the labyrinth channel 3s can be discharged from the through holes 332h to the fixed The outside of the cover 33, ie the discharge to the outside of the actuating mechanism.
  • the abutting portion 333 has a cylindrical shape protruding from the cover main body 331 toward the other side in the axial direction (that is, toward the skeleton bottom 3212 of the inner sleeve 32 ), and the other axial end of the abutting portion 333 presses the inner sleeve 32 It abuts against the projection 1p formed by the portion of the housing 1 surrounded by the outer sleeve 31 .
  • the discharge assembly 3 can be firmly fixed to the main body 11 of the casing 1 ; an oil cavity 1s from the casing 1 is formed between the casing 1 and the discharge assembly 3 , passing through the casing 1 in sequence.
  • the lip 3222 only allows the oil/air in the oil chamber 1s to flow to the labyrinth passage 3s, while preventing foreign matter such as external dust and air from entering the oil chamber 1s in the housing 1, the one-way valve can have a predetermined pressure in the oil chamber 1s. It is opened and closed automatically under the condition that the pressure in the oil chamber 1s is less than a predetermined pressure, so that the opening/closing of the above-mentioned passage can be
  • the return spring 4 is a cylindrical coil spring, and the return spring 4 is located inside the housing 1 and is sleeved on the piston 21 .
  • One end of the return spring 4 is in contact with the stepped structure formed by the piston 21 , and the other end is in contact with the cover portion 12 of the housing 1 .
  • the lock assembly 5 includes a solenoid valve 51 provided in the main body 11 of the case 1 , a lock pin 52 , and a lock spring 53 , and a part of the lock pin 52 is formed through the center of the main body 11 of the case 1 .
  • the holes of the piston 21 can be engaged with the two locking grooves 21c of the piston 21, so that the piston assembly 2 can be locked in two different positions.
  • Both the acting force of the solenoid valve 51 and the spring force of the locking spring 53 can act on the locking pin 52 , so that the locking pin 52 can be engaged and disengaged from the locking groove 21 c of the piston 21 .
  • the actuating mechanism for a parking brake system due to the presence of the sealing lip 3222 as a one-way valve, when the actuating mechanism for a parking brake system is inactive In this state, the air in the transmission is prevented from entering the oil chamber 1s, thereby eliminating the above-mentioned noise caused by the air in the oil chamber 1s being discharged too quickly.
  • the elastic portion 322 may include at least one helical protrusion spirally and continuously extending around the outer peripheral portion of the skeleton portion 321, and the radially outer ends of the helical protrusion all abut against the outer casing Cartridge 31. In this way, the labyrinth channel 3s can also be realized by the helical projection.
  • outer sleeve 31 and the main body portion 11 of the housing 1 are formed integrally with each other in the above specific embodiment, the present invention is not limited to this.
  • the outer sleeve may be a separate part from the housing, and the outer sleeve may be fixed to the housing, eg, by screwing or the like.
  • the sealing lip is not limited to being formed at the other axial end of the inner sleeve 32 , and the sealing lip may also be formed at one axial end of the inner sleeve 32 or at an axial middle position of the inner sleeve 32 .
  • the sealing lip may be formed on one axial side of the plurality of circumferential protrusions 3221 or formed between the plurality of circumferential protrusions 3221 .

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  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

一种驻车制动***用致动机构，其包括：壳体（1），其形成有彼此独立的第一通道（11h1）和第二通道（11h2）；活塞组件（2），其至少一部分位于壳体（1）的内部，以在壳体（1）的内部分隔出与第一通道（11h1）和第二通道（11h2）均连通的油腔（1s）；以及排放组件（3），其相对于壳体（1）固定且形成有迷宫通道（3s），迷宫通道（3s）与第二通道（11h2）连通，以使得经由第二通道（11h2）排出的介质和/或空气能够进入迷宫通道（3s），进而排放到外部。这样，避免了在油腔内无法建立足够的油压的问题，而且减小了排出的介质和/或空气的冲击可能导致变速器的其它部件出现故障的几率。

Description

驻车制动***用致动机构 技术领域
本发明涉及车辆的驻车领域，具体地涉及用于车辆的驻车制动***用致动机构。
背景技术
现有的用于车辆的驻车制动***用致动机构包括壳体和部分位于壳体内的活塞组件。在导入壳体的油腔内的高压油的作用下，该活塞组件能够克服复位弹簧的弹簧力而沿着壳体的轴向相对于壳体朝向一侧进行相对运动；在导入油腔的高压油通过活塞组件与壳体之间的间隙排出之后，在复位弹簧的弹簧力的作用下，该活塞组件能够沿着壳体的轴向相对于壳体朝向另一侧进行相对运动。这样，实现了活塞组件相对于壳体的往复运动，从而能够带动致动机构外部的棘爪与变速器的齿轮接合和分离，来实现和解除驻车制动功能。
虽然上述驻车制动***用致动机构能够实现和解除驻车制动功能，但是存在如下缺陷。
一方面，在上述致动机构工作一段时间之后，活塞组件与壳体之间的摩擦会导致两者之间的间隙越来越大，这样在上述致动机构工作的过程中导入壳体的油腔内的高压油会过快地从活塞组件与壳体之间的间隙排出，从而导致在壳体的油腔内无法建立足够的油压，由此油腔内的油难以对活塞组件施加足够的作用力来克服复位弹簧的弹簧力，从而导致该致动机构不能正常作业。
另一方面，在上述致动机构的工作过程中，导入壳体的油腔内的高压油的压力较高(例如，10bar-40bar)，油腔内的高压油和/或混入高压油内的空 气，特别是车辆停止工作后进入油腔的空气，将以非常高的速度(动能)经由活塞组件和壳体之间的间隙排出，被排出的油和/或空气将碰到变速器内的其它部件，这有可能对这些部件造成损坏，从而导致这些部件出现故障。
发明内容
鉴于上述现有技术的缺陷而做出本发明。本发明的目的在于提供一种驻车制动***用致动机构，其不仅能够避免由于活塞组件和壳体之间不断变大的间隙导致在壳体的油腔内无法建立足够的油压的问题，而且还能够减小致动机构排出的油和/或空气的冲击导致变速器的其它部件出现故障的几率。
为了实现上述发明目的，本发明采用如下的技术方案。
本发明提供了一种如下的驻车制动***用致动机构，所述驻车制动***用致动机构包括：
壳体，所述壳体形成有彼此独立的第一通道和第二通道；
活塞组件，所述活塞组件的至少一部分位于所述壳体的内部，以在所述壳体的内部分隔出与所述第一通道和所述第二通道均连通的油腔，利用经由所述第一通道导入所述油腔内的介质能够推动所述活塞组件相对于所述壳体进行运动；以及
排放组件，所述排放组件相对于所述壳体固定且形成有迷宫通道，所述迷宫通道与所述第二通道连通，以使得经由所述第二通道排出的所述介质和/或混入所述介质的空气能够进入所述迷宫通道，进而经由所述迷宫通道排放到所述驻车制动***用致动机构的外部。
优选地，所述排放组件还包括单向阀，所述单向阀仅允许所述介质和/或所述空气从所述第二通道进入所述迷宫通道。
更优选地，所述单向阀设置于所述迷宫通道和所述第二通道之间。
更优选地，所述排放组件还包括：
外套筒，所述外套筒以包围所述第二通道的通向所述壳体的外部的开口的方式相对于所述壳体固定；以及
内套筒，所述内套筒以与所述外套筒同轴的方式位于所述外套筒的内部且相对于所述外套筒固定；
其中，所述迷宫通道形成在所述外套筒和所述内套筒之间。
更优选地，所述内套筒包括：
骨架部，所述骨架部形成为具有骨架底部的圆筒形状，所述骨架底部面对所述第二通道的所述开口，并且通过所述骨架底部的引导使经由所述第二通道流出的所述介质和/或所述空气流向所述内套筒和所述外套筒之间的所述迷宫通道；以及
弹性部，所述弹性部形成于所述骨架部的外周部，并且从所述骨架部的外周部朝向所述外套筒的内周部凸出以抵接所述外套筒，在所述弹性部与所述外套筒之间形成所述迷宫通道。
更优选地，所述弹性部包括沿着所述内套筒的周向延伸且在所述内套筒的轴向上彼此分隔开的多个周向凸起，所述多个周向凸起的径向外侧端均抵接于所述外套筒，各所述周向凸起均形成有至少一个缺口并且相邻的周向凸起的缺口在所述周向上位于不同的位置；或者
所述弹性部包括绕着所述骨架部的外周螺旋状地连续延伸的至少一个螺旋凸起，所述螺旋凸起的径向外侧端均抵接于所述外套筒。
更优选地，所述弹性部还包括密封唇，所述密封唇沿着所述内套筒的周向连续地延伸，并且所述密封唇朝向所述骨架部的径向外侧延伸的同时朝向远离所述第二通道的方向延伸，从而所述密封唇能够与所述外套筒接触密封，并且所述密封唇用作所述迷宫通道与所述第二通道之间的单向阀。
更优选地，所述壳体在由所述外套筒包围的部分中形成有朝向所述骨架底部凸出的凸起部，所述骨架底部压抵于所述凸起部使得所述骨架底部与所述第二通道的所述开口间隔开。
更优选地，所述骨架部由金属制成，所述弹性部由橡胶、硅胶或塑料制成，所述弹性部通过硫化成型固定于所述骨架部。
更优选地，所述外套筒与所述壳体形成为一体。
更优选地，所述排放组件还包括固定于所述外套筒的固定盖，所述固定盖包括：
盖主体，所述盖主体外套于所述外套筒；
盖底部，所述盖底部固定于所述盖主体且形成有与所述迷宫通道连通的通孔，使得经由所述迷宫通道流出的所述介质和/或所述空气能够从所述通孔排放到所述驻车制动***用致动机构外部；以及
抵接部，所述抵接部固定于所述盖底部且从所述盖底部朝向所述内套筒伸出以将所述内套筒压抵于所述壳体的由所述外套筒包围的部分。
通过采用上述的技术方案，本发明提供了一种新型的驻车制动***用致动机构，其包括壳体、在壳体内能够相对于壳体运动的活塞组件以及排放组件。壳体形成有与其内部油腔连通的第一通道和第二通道，经由第一通道能够向油腔导入高压油以推动活塞组件，经由第二通道能够将油腔内的介质(例如，油)和/或混入油内的空气排出。另外，排放组件相对于壳体固定且形成有与第二通道连通的迷宫通道，经由第二通道排出的介质和/或空气能够经由迷宫通道排放到致动机构的外部。
这样，由于形成排放介质和/或空气的迷宫通道的排放组件相对于壳体固定，因此迷宫通道不会随着致动机构的工作而变大，从而避免了背景技术中说明的在油腔内无法建立足够的油压的问题；另外，由于迷宫通道能够具 有足够的通道长度和弯曲的通道路径，因而使得进入迷宫通道内的介质和/或空气在迷宫通道内行进的过程中能够损失足够多的动能，因而减小了排出的介质和/或空气的冲击可能导致变速器的其它部件出现故障的几率。
附图说明
图1是示出了根据本发明的一实施方式的驻车制动***用致动机构的剖视示意图。
图2是示出了图1中的驻车制动***用致动机构的局部结构的剖视示意图。
图3是示出了图1中的驻车制动***用致动机构的局部结构的立体示意图。
图4是示出了图1中的驻车制动***用致动机构的内套筒的结构的立体示意图。
图5是示出了图1中的驻车制动***用致动机构的固定盖的结构的立体示意图。
附图标记说明
1壳体 11主体部 11h1第一通道 11h2第二通道 11p开口 12盖部 1s油腔 1p凸起部
2活塞组件 21活塞 21c锁止槽 22密封圈
3排放组件 3s迷宫通道 31外套筒 31t外螺纹部 32内套筒 321骨架部 3211骨架主体 3212骨架底部 322弹性部 3221周向凸起 3221c缺口 3222密封唇 33固定盖 331盖主体 332盖底部 332h通孔 331t内螺纹部 333抵接部
4复位弹簧
5锁止组件 51电磁阀 52锁止销 53锁止弹簧
A轴向 R径向。
具体实施方式
下面参照附图描述本发明的示例性实施方式。应当理解，这些具体的说明仅用于示教本领域技术人员如何实施本发明，而不用于穷举本发明的所有可行的方式，也不用于限制本发明的范围。
在本发明中，除非另有说明，否则轴向、径向和周向分别是指根据本发明的驻车制动***用致动机构的外套筒和内套筒的轴向、径向和周向；“轴向一侧”是指图1、图2、图4中的左侧，“轴向另一侧”是指图1、图2、图4中的右侧；“径向外侧”是指远离内套筒和外套筒的中心轴线的那侧，“径向内侧”是指接近内套筒和外套筒的中心轴线的那侧。以下参照附图来说明根据本发明的一实施方式的驻车制动***用致动机构的结构。
如图1所示，根据本发明的一实施方式的驻车制动***用致动机构包括组装在一起的壳体1、活塞组件2、排放组件3、复位弹簧4和锁止组件5。
具体地，在本实施方式中，如图1所示，壳体1包括组装在一起的主体部11和盖部12。主体部11形成为大致圆筒形状，主体部11的一侧端(图1中左侧端)具有底部且另一侧端(图1中右侧端)形成有开口，盖部12以封闭主体部11的开口的方式组装于主体部11，使得主体部11和盖部12包围形成预定容积的内部空间。进一步地，主体部11的筒状主体的一侧端部形成有与内部空间连通的第一通道11h1，主体部11的底部的远离第一通道11h1的部位形成有贯通该底部且与内部空间连通的第二通道11h2。第一通道11h1和第二通道11h2彼此独立且间隔开足够的距离，使得经由第一通道11h1导入壳体1的内部的高压油不会过快地从第二通道11h2排出。主体部11的筒状主体的大致中央部位形成有供锁止组件5的锁止销52伸入到壳体1的内部的孔。盖部12形成 有贯通该盖部12且供活塞21的一部分伸出到壳体1的外部的孔。
进一步地，在本实施方式中，如图1所示，活塞组件2的一部分位于壳体1的内部，另一部分则穿过盖部12形成的孔伸出到壳体1的外部。活塞组件2包括组装在一起的活塞21和密封圈22。活塞21能够在壳体1内沿着壳体1的筒状主体的轴向往复运动，密封圈22套装于活塞21的外周部且位于活塞21和壳体1的筒状主体之间，以实现活塞21与壳体1的主体部11之间的密封。这样，在活塞21的一侧端与壳体1的底部之间的空间形成为与第一通道11h1和第二通道11h2均连通的油腔1s，经由第一通道11h1能够将高压油导入该油腔1s内，经由第二通道11h2能够将油腔1s内的油和/或混入油内的空气排出油腔1s。此外，活塞21的外周部的比密封圈22安装的部位靠另一侧的部位形成有两个锁止槽21c，两个锁止槽21c分别与锁止组件5的锁止销52配合能够将活塞21锁止在两个不同的位置，这两个不同的位置分别对应实现驻车制动功能和解除驻车制动功能。
进一步地，在本实施方式中，如图1和图2所示，排放组件3安装于壳体1的形成第二通道11h2的部位处，并且排放组件3形成的迷宫通道3s与壳体1的第二通道11h2连通，使得经由第二通道11h2排出的油和/或空气能够通过迷宫通道3s排放到致动机构的外部。具体地，该排放组件3包括组装在一起的外套筒31、内套筒32和固定盖33。
如图2和图3所示，外套筒31以包围第二通道11h2的通向壳体1的外部的开口11p的方式与壳体1的主体部11形成为一体，并且外套筒31从壳体1的主体部11朝向轴向一侧延伸出足够的长度。外套筒31的外周部形成有与固定盖33的下述内螺纹部331t螺纹连接的外螺纹部31t。另外，在壳体1的底部的由外套筒31包围的部分中，壳体1的底部的轴向一侧端面形成有朝向轴向一侧(朝向内套筒32的下述骨架底部3212)凸出的一个或多个凸起部1p，在骨架 底部3212被固定盖33压抵于凸起部1p的状态下骨架底部3212与第二通道11h2的开口11p间隔开，而不会阻塞第二通道11h2的开口11p，从而不会影响油腔1s内的油和/或空气经由第二通道11h2的流出。
如图2和图4所示，内套筒32以与外套筒31同轴的方式位于外套筒31的内部且通过固定盖33固定于外套筒31和壳体1，在径向R上彼此相对的内套筒32的外周部和外套筒31的内周部之间形成迷宫通道3s。具体地，内套筒32包括固定在一起的骨架部321和弹性部322。在本实施方式中，骨架部321由金属制成且弹性部322由橡胶、硅胶或塑料等制成，弹性部322例如通过硫化成型固定于骨架部321的外周部。
骨架部321包括形成为一体的骨架主体3211和骨架底部3212，骨架主体3211形成为圆筒形状，骨架底部3212位于骨架主体3211的轴向另一侧端以封闭骨架主体3211的轴向另一侧端。骨架主体3211的外径小于外套筒31的内径，以在径向R上在骨架主体3211和外套筒31之间留有足够的空间容纳弹性部322。在轴向A上，骨架底部3212面对第二通道11h2的开口11p，利用骨架底部3212的止挡和引导作用，使得经由第二通道11h2的介质和/或空气流向内套筒32和外套筒31之间的迷宫通道3s。如上所述，骨架底部3212被固定盖33压抵于在壳体1的底部形成的凸起部1p，从而使得骨架底部3212与第二通道11h2的开口11p间隔开而不会封闭第二通道11h2的开口11p。
弹性部322被形成为从骨架部321的外周部朝向外套筒31的内周部凸出并抵接外套筒31，利用弹性部322与外套筒31形成迷宫通道3s。具体地，弹性部322包括沿着周向延伸且在轴向A上彼此分隔开的四个周向凸起3221，四个周向凸起3221的径向外侧端均抵接于外套筒31的内周部。各周向凸起3221均形成有一个缺口3221c，使得各周向凸起3221两侧的通路经由该缺口3221c彼此连通。相邻的周向凸起3221的缺口3221c在周向上位于不同的位置。弹 性部322还包括位于骨架部321的轴向另一侧端的密封唇3222，密封唇3222位于比所有的周向凸起3221靠轴向另一侧的位置。该密封唇3222沿着周向连续地延伸，并且密封唇3222朝向骨架部321的径向外侧延伸的同时朝向轴向一侧(朝向远离第二通道11h2的方向)延伸，使得密封唇3222能够与外套筒31实现接触密封。这样，在密封唇3222和四个周向凸起3221之间的通路构成了迷宫通道3s。此外，密封唇3222还用作从壳体1的第二通道11h2通向迷宫通道3s的单向阀，利用该密封唇3222的上述结构使得仅允许油腔1s内的油和/或空气从第二通道11h2进入迷宫通道3s，而不允许迷宫通道3s内的油和/或空气返回第二通道11h2，而且该单向阀还起到防止致动机构外部的灰尘等进入壳体1内部的防尘作用。
如图2和图5所示，固定盖33通过与外套筒31螺纹连接而固定于外套筒31的同时将内套筒32压紧于外套筒31的内部，使得内套筒32以与外套筒31同轴的方式相对固定。固定盖33包括形成为一体的盖主体331、盖底部332和抵接部333。盖主体331具有圆筒形状，盖主体331的内周部形成有与外套筒31的外螺纹部31t配合的内螺纹部331t。通过上述外螺纹部31t和内螺纹部331t彼此螺纹连接使得固定盖33以外套于外套筒31的方式固定于外套筒31。盖底部332位于盖主体331的轴向一侧端，盖底部332形成有贯通盖底部332的例如四个通孔332h，使得经由迷宫通道3s的介质和/或空气能够从通孔332h排出到固定盖33的外部，即排放到致动机构的外部。抵接部333具有从盖主体331朝向轴向另一侧(即朝向内套筒32的骨架底部3212)伸出的圆柱形状，抵接部333的轴向另一侧端将内套筒32压抵于壳体1的由外套筒31包围的部分形成的凸起部1p。
通过采用上述的方案，使得排放组件3能够牢固地固定于壳体1的主体部11；在壳体1与排放组件3之间形成了从壳体1的油腔1s，顺次经由壳体1的第二通道11h2、内套筒32和外套筒31之间的迷宫通道3s以及密封盖的盖底部 332的通孔332h，最终到致动机构的外部的通路；而且作为单向阀的密封唇3222仅允许油腔1s内的油/空气流向迷宫通道3s，同时防止外部的灰尘等异物、空气进入壳体1内的油腔1s，该单向阀能够在油腔1s内具有预定压力的条件下开启并且在油腔1s内小于预定压力的条件下自动关闭，由此能够控制上述通路的开启/关闭。
进一步地，在本实施方式中，如图1所示，复位弹簧4为圆柱螺旋弹簧，复位弹簧4位于壳体1的内部并且套装于活塞21。复位弹簧4的一侧端抵接于活塞21形成的台阶结构，另一侧端抵接于壳体1的盖部12。这样，借助于油腔1s内的高压油的压力与复位弹簧4的弹簧力，能够实现活塞组件2在所述壳体1内相对于壳体1沿着壳体1的轴向进行往复运动。另外，锁止组件5包括设置于壳体1的主体部11的电磁阀51、锁止销52和锁止弹簧53，锁止销52的一部分穿过壳体1的主体部11的中央部形成的孔以能够与活塞21的两个锁止槽21c接合，从而能够将活塞组件2锁定在两个不同的位置。电磁阀51的作用力和锁止弹簧53的弹簧力均能作用于锁止销52，从而能够实现锁止销52与活塞21的锁止槽21c接合和分离。
应当理解，上述实施方式仅是示例性的，不用于限制本发明。本领域技术人员可以在本发明的教导下对上述实施方式做出各种变型和改变，而不脱离本发明的范围。另外，进行如下补充说明。
(i)在如背景技术中所述的现有的驻车制动***用致动机构处于非工作状态时油泵未向壳体的油腔提供高压油，因此壳体的油腔内的油将回到油泵，则来自变速器内的空气将经由活塞和壳体之间的间隙进入油腔，在这样的状态下驻车制动***用致动机构开始工作以利用油泵向油腔导入高压油时，油腔内的空气将通过上述间隙在极短时间内排出油腔，这将导致产生不期望的噪声。
相比之下，在根据本发明的一实施方式的驻车制动***用致动机构中，由于存在作为单向阀的密封唇3222，因而当驻车制动***用致动机构处于非 工作状态时避免了变速器内的空气进入油腔1s内，进而消除了上述由于过快排出油腔1s内的空气而产生的噪声。
(ii)虽然在以上的具体实施方式中说明了内套筒32的弹性部322的周向凸起3221的数量为四个且各周向凸起3221仅形成一个缺口3221c，但是本发明不限于此，该周向凸起3221的数量以及各周向凸起3221形成的缺口3221c的数量可以根据需要进行改变。
另外，作为形成迷宫通道3s的替代方案，弹性部322可以包括绕着骨架部321的外周部螺旋状地连续延伸的至少一个螺旋凸起，螺旋凸起的径向外侧端均抵接于外套筒31。这样，通过该螺旋凸起也能够实现迷宫通道3s。
无论采用上述具体实施方式中说明的方案还是其替代方案，均可以实现本申请的发明目的，而且还可以例如通过改变迷宫通道3s的形状和尺寸来改变油和/或空气的排放速度。
(iii)虽然在以上的具体实施方式中说明了外套筒31与壳体1的主体部11形成为一体，但是本发明不限于此。外套筒可以为独立于壳体的单独的零件，并且外套筒可以例如通过螺纹连接等方式固定于壳体。
(iv)虽然在以上的具体实施方式中说明了利用弹性部322的密封唇3222作为迷宫通道3s与第二通道11h2之间的单向阀，但是本发明不限于此。可以设置独立于内套筒32和壳体1的单独的单向阀，只要满足该单向阀仅允许油腔1s内的油和/或空气经由第二通道11h2流向迷宫通道3s而不允许反向流动即可。
密封唇也不限于形成于内套筒32的轴向另一侧端，密封唇还可以形成于内套筒32的轴向一侧端或者形成于内套筒32的轴向中间位置。例如，密封唇可以形成于多个周向凸起3221的轴向一侧或者形成于多个周向凸起3221之间。

Claims (11)

  1. 一种驻车制动***用致动机构，所述驻车制动***用致动机构包括：
    壳体(1)，所述壳体(1)形成有彼此独立的第一通道(11h1)和第二通道(11h2)；
    活塞组件(2)，所述活塞组件(2)的至少一部分位于所述壳体(1)的内部，以在所述壳体(1)的内部分隔出与所述第一通道(11h1)和所述第二通道(11h2)均连通的油腔(1s)，利用经由所述第一通道(11h1)导入所述油腔(1s)内的介质能够推动所述活塞组件(2)相对于所述壳体(1)进行运动；以及
    排放组件(3)，所述排放组件(3)相对于所述壳体(1)固定且形成有迷宫通道(3s)，所述迷宫通道(3s)与所述第二通道(11h2)连通，以使得经由所述第二通道(11h2)排出的所述介质和/或混入所述介质的空气能够进入所述迷宫通道(3s)，进而经由所述迷宫通道(3s)排放到所述驻车制动***用致动机构的外部。
  2. 根据权利要求1所述的驻车制动***用致动机构，其特征在于，所述排放组件(3)还包括单向阀，所述单向阀仅允许所述介质和/或所述空气从所述第二通道(11h2)进入所述迷宫通道(3s)。
  3. 根据权利要求2所述的驻车制动***用致动机构，其特征在于，所述单向阀设置于所述迷宫通道(3s)和所述第二通道(11h2)之间。
  4. 根据权利要求1至3中任一项所述的驻车制动***用致动机构，其特征在于，所述排放组件(3)还包括：
    外套筒(31)，所述外套筒(31)以包围所述第二通道(11h2)的通向所述壳体(1)的外部的开口(11p)的方式相对于所述壳体(1)固定；以及
    内套筒(32)，所述内套筒(32)以与所述外套筒(31)同轴的方式位 于所述外套筒(31)的内部且相对于所述外套筒(31)固定；
    其中，所述迷宫通道(3s)形成在所述外套筒(31)和所述内套筒(32)之间。
  5. 根据权利要求4所述的驻车制动***用致动机构，其特征在于，所述内套筒(32)包括：
    骨架部(321)，所述骨架部(321)形成为具有骨架底部(3212)的圆筒形状，所述骨架底部(3212)面对所述第二通道(11h2)的所述开口(11p)，并且通过所述骨架底部(3212)的引导使经由所述第二通道(11h2)流出的所述介质和/或所述空气流向所述内套筒(32)和所述外套筒(31)之间的所述迷宫通道(3s)；以及
    弹性部(322)，所述弹性部(322)形成于所述骨架部(321)的外周部，并且从所述骨架部(321)的外周部朝向所述外套筒(31)的内周部凸出以抵接所述外套筒(31)，在所述弹性部(322)与所述外套筒(31)之间形成所述迷宫通道(3s)。
  6. 根据权利要求5所述的驻车制动***用致动机构，其特征在于，
    所述弹性部(322)包括沿着所述内套筒(32)的周向延伸且在所述内套筒(32)的轴向(A)上彼此分隔开的多个周向凸起(3221)，所述多个周向凸起(3221)的径向外侧端均抵接于所述外套筒(31)，各所述周向凸起(3221)均形成有至少一个缺口(3221c)并且相邻的周向凸起(3221)的缺口(3221c)在所述周向上位于不同的位置；或者
    所述弹性部(322)包括绕着所述骨架部(321)的外周螺旋状地连续延伸的至少一个螺旋凸起，所述螺旋凸起的径向外侧端均抵接于所述外套筒(31)。
  7. 根据权利要求5或6所述的驻车制动***用致动机构，其特征在于，所 述弹性部(322)还包括密封唇(3222)，所述密封唇(3222)沿着所述内套筒(32)的周向连续地延伸，并且所述密封唇(3222)朝向所述骨架部(321)的径向外侧延伸的同时朝向远离所述第二通道(11h2)的方向延伸，从而所述密封唇(3222)能够与所述外套筒(31)接触密封，并且所述密封唇(3222)用作所述迷宫通道(3s)与所述第二通道(11h2)之间的单向阀。
  8. 根据权利要求5至7中任一项所述的驻车制动***用致动机构，其特征在于，所述壳体(1)在由所述外套筒(31)包围的部分中形成有朝向所述骨架底部(3212)凸出的凸起部(1p)，所述骨架底部(3212)压抵于所述凸起部(1p)使得所述骨架底部(3212)与所述第二通道(11h2)的所述开口(11p)间隔开。
  9. 根据权利要求5至8中任一项所述的驻车制动***用致动机构，其特征在于，所述骨架部(321)由金属制成，所述弹性部(322)由橡胶、硅胶或塑料制成，所述弹性部(322)通过硫化成型固定于所述骨架部(321)。
  10. 根据权利要求5至9中任一项所述的驻车制动***用致动机构，其特征在于，所述外套筒(31)与所述壳体(1)形成为一体。
  11. 根据权利要求5至10中任一项所述的驻车制动***用致动机构，其特征在于，所述排放组件(3)还包括固定于所述外套筒(31)的固定盖(33)，所述固定盖(33)包括：
    盖主体(331)，所述盖主体(331)外套于所述外套筒(31)；
    盖底部(332)，所述盖底部(332)固定于所述盖主体(331)且形成有与所述迷宫通道(3s)连通的通孔(332h)，使得经由所述迷宫通道(3s)流出的所述介质和/或所述空气能够从所述通孔(332h)排放到所述驻车制动***用致动机构外部；以及
    抵接部(333)，所述抵接部(333)固定于所述盖底部(332)且从所述 盖底部(332)朝向所述内套筒(32)伸出以将所述内套筒(32)压抵于所述壳体(1)的由所述外套筒(31)包围的部分。
PCT/CN2020/125822 2020-11-02 2020-11-02 驻车制动***用致动机构 WO2022088174A1 (zh)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030197A1 (fr) * 1979-12-03 1981-06-10 BENDIX France Générateur de pression hydraulique
EP0025559B1 (de) * 1979-09-12 1984-03-21 Knorr-Bremse Ag Entlüftungsvorrichtung für einen Federspeicherbremszylinder, insbesondere einen kombinierten Betriebsbrems- und Federspeicherbremszylinder
CN103459878A (zh) * 2011-03-17 2013-12-18 克诺尔-布里姆斯轨道车辆***有限公司 具有迷宫式流动通道的气动制动缸
CN105683024A (zh) * 2013-08-16 2016-06-15 克诺尔轨道车辆***有限公司 用于气动制动缸的冷凝装置
CN211335945U (zh) * 2019-12-02 2020-08-25 广州中博制动***有限公司 一种断油压的驻车制动机构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025559B1 (de) * 1979-09-12 1984-03-21 Knorr-Bremse Ag Entlüftungsvorrichtung für einen Federspeicherbremszylinder, insbesondere einen kombinierten Betriebsbrems- und Federspeicherbremszylinder
EP0030197A1 (fr) * 1979-12-03 1981-06-10 BENDIX France Générateur de pression hydraulique
CN103459878A (zh) * 2011-03-17 2013-12-18 克诺尔-布里姆斯轨道车辆***有限公司 具有迷宫式流动通道的气动制动缸
CN105683024A (zh) * 2013-08-16 2016-06-15 克诺尔轨道车辆***有限公司 用于气动制动缸的冷凝装置
CN211335945U (zh) * 2019-12-02 2020-08-25 广州中博制动***有限公司 一种断油压的驻车制动机构

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