• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1. A wheel cylinder comprising a body (12), in the interior of which a bore (14) is formed, with at least on actuating piston (16) being slidably mounted in the bore at one end thereof and bounding a pressure chamber (20) with the latter, said actuating piston (16) being adapted to be movable towards the exterior of the bore for urging a first shoe (22) of a drum brake, said cylinder comprising a supply passage (30, 32, 34, 36) for supplying said pressure chamber (20) with fluid under pressure from a source of pressure fluid, a valve (50) adapted to modulate the pressure in the pressure chamber (20) according to the pressure supplied by the pressure source being incorporated in the wheel cylinder, characterized in that the supply passage (30, 32, 34, 36) comprises a portion (32, 34, 36) constituted by an annular groove (32) of the actuating piston (16) adapted to receive fluid under pressure from the pressure source, a blind axial bore (34) being defined in the actuating piston, said blind bore (34) being in communication with the annular groove (32) and opening towards the pressure chamber (20), said valve (50) being of the differential piston type and being disposed in the blind bore (34) of the actuating piston (16), the valve (50) occupying, for an inlet pressure below a predetermined value, an opening position allowing a pressure increase in the pressure chamber (20) equal to the increase of the inlet pressure ; and the valve (50) for an inlet pressure above said predetermined value, performing a succession of opening and closing movements allowing only a pressure increase in the pressure chamber (20) smaller than the increase of the inlet pressure, according to the ratio of the effective surfaces of the differential piston (52).
    公开号:SU1056923A3
    申请号:SU792763597
    申请日:1979-05-18
    公开日:1983-11-23
    发明作者:Левре Ролан；Рикар Кристиан
    申请人:Сосьете Аноним Д.Б.А. (Фирма)；
    IPC主号:
    专利说明:

    2. A cylinder according to claim 1, characterized in that it is provided with a stop fixed relative to the working piston, and the pressure modulation valve is designed as a spring-loaded spherical element and a differential piston with a variable outer diameter inside. which has a central blind hole on the side of the pressure chamber and a radial channel connecting the central blind hole of the differential piston to the annular groove of the working piston through the radial channel of the working piston, and a spring-loaded spherical element interacting with a fixed stop of the brake cylinder is installed in the central blind hole of the differential piston , and the elastic return device interacts with a smaller diameter of the differential piston.
    3. A cylinder according to claim 1, characterized in that it is equipped with a discharge valve, an additional orifice of variable diameter is made in the working piston, and a discharge valve is installed in a larger cross section of this opening on the side of the pressure chamber.
    This invention relates to mechanical engineering, in particular, to drum drum brakes of vehicles.
    The closest to the invention in technical essence and achievable effect is the brake cylinder of a vehicle wheel, comprising a housing with feed channels and with an opening inside which is mounted with the possibility of axial movement in the direction of the brake shoes and with the possibility of limiting the volume of the pressure chamber a piston, a pressure modulating valve associated with the pressure chamber, with a pressure source through the supply channels of the housing and with the ability to cooperate with an elastic return ij stroystvom.
    The drawback of the device is a large response time, since the operation of the pressure modulating valve does not depend on the load.
    The purpose of the invention is to increase the speed of the device depending on the load by reducing the response time of the pressure modulating valve.
    The goal is achieved in that in the brake cylinder of a vehicle wheel comprising a housing with feed channels and with an opening within which is installed with the possibility of axial movement in the direction of the brake shoes and with the possibility of limiting the volume of the pressure chamber at least one working piston pressure associated with the pressure gauge, with a pressure source through the feed channels of the housing and with the possibility of interaction with the elastic return device, are made in the working piston adialny channel annular groove
    on the side of the supply channels of the housing and the central blind step hole, the central blind step hole is connected to the annular groove by the radial channel, a larger section of this hole is made from the pressure chamber side and a pressure modulator is installed in the smaller one
    t is a device. Moreover, the cylinder is provided with a stop fixed relative to the working piston, and the pressure modulation valve is made in the form of a spring-loaded spherical element
    0 and a differential piston with a variable outer diameter, inside which there is a central blind hole on the side of the pressure chamber and a radial channel connecting the central blind hole of the differential piston with the working piston's annular groove through the radial channel of the working piston, moreover, in the central blind hole of the differential piston a spring-loaded spherical element interacting with a fixed stop of the brake cylinder is installed, and the elastic return device interacts with smaller diameter differential piston.
    In addition, the cylinder is equipped with a discharge valve, a variable orifice is bore in the working piston, and a loading valve is installed in the larger section of this opening on the pressure chamber side. FIG. 1 shows a brake cylinder, a longitudinal section; on .fig. 2 - the same, with a discharge valve, variant, longitudinal section. The brake cylinder of a vehicle wheel consists of a housing 1 with a through hole 2 in which the working pistons 3 and 4 are installed. Some ends of the working pins 3 and 4 form with the wall a through hole 2 - chamber.5 pressure, and others interact with the brake blocks b and 7 drum-brake. Each working piston has an annular seal 8 and 9. In the housing 1 there are supply channels connected to a constant pressure source. The feed channel 10 enters an annular groove 11 formed on the outer cylindrical surface of the working piston 3, and the blowing channel 12 enters the pressure chamber. Inside the working piston 3 there is a central blind step 13 and a radial channel 14 connecting the annular groove IX with the central blind hole 13. The gradation of the central blind hole 13 is formed by a large section 15, made on the side of pressure chamber 5 and smaller section 16. In the central deaf bore 13 in a larger section 15, a modulation valve 17 is installed, made in the form of a differential piston 18 with external diameter nepeMeHHbw. On the outer surface of a larger cross section of the differential piston 18, an annular groove is formed associated with the radial channel 14 of the working piston 3 and with the radial and axial blind. channels 20 performed by the differential piston 18. The deaf central channel 20 is complete in the differential piston, 18 from the pressure chamber 5 side and has a ball element 21 and a weak spring 22, which presses the ball element 21 to the seat 23, positioned on differential piston 18. In the working piston 3, the support 24 is made with a fixed stop relative to the differential piston 18. The smaller diameter of the differential piston is 18 prjat with a constant force by an elastic-return device made in the form of a compression spring 25 and installed in a smaller cross section of the 16 step opening of the working piston 3. The brake cylinder of the transport medium wheel works as follows. in the quiescent state, the differential piston 18. is compressed by the compression spring 25 to the pressure chamber 5. In this position, a fixed stop of the support 24 acts on the ball element 21. The pressure chamber 5 communicates with the supply channel 10 through the radial channels 14, the annular groove 19, the blind central hole 20 and the space separating the ball element 21 from its saddle 23. When the pressure the inlet is small; the pressure in the chamber 5. The pressure remains equal to the pressure in the supply channel 10. As the inlet pressure rises, the resultant force on the small cross section of the differential piston 18 also increases. When the pressure exceeds the compressive force of the spring 25, the differential pressure 18 moves, compressing the spring. At this moment, the spherical element 21 contacts the seat 23 and interrupts the communication between the blind central hole 20 and the pressure chamber 5. If the inlet pressure rises, the pressure in the annular groove 19 rises, causing the differential piston .18 to move to the pressure chamber 5 and re-opening the spherical element 21. Some of the fluid flows out of the blind central hole 20 into the pressure chamber 5, where the pressure rises This is intended to press the differential piston 18 against the elastic return device and bring the seat 23 into contact with the ball element 21. Thus, for any increase in inlet pressure, i.e. for any load variations, the sequence of opening and closing by the ball element 21 of the central blind hole 20 takes place, while the pressure in the pressure chamber rises less than at the inlet. ; The device can work with: discharge valve (Fig. 2). The brake device of a wheel of the vehicle, in this case contains all elements, except raz-. the load valve 26, and the pressure modulating valve 17 is installed in the working piston 3 with a slight displacement relative to the discharge valve. . A discharge valve 26 is installed in an axial channel 27 of variable diameter, a larger cross section of which is made on the side of the pressure chamber 5 connecting the radial channel 14 to the pressure chamber 5. The discharge valve 27 consists of a ball 28, which is constantly pressed by the spring 29 to the seat 30.
    The brake cylinder of a vehicle wheel with a discharge valve operates as follows.
    When considering the work, three phases can be distinguished: the first phase, when the pressure in the pressure chamber 5 remains equal to the pressure in the supply channel 10 and the second phase, when the pressure in the pressure chamber 5 rises slower than the pressure in the supply channel 10 In these cases, the discharge ball 28 The valve 26 is subjected to pressure, different from its two sides, and a force appears that tends to lift the ball from its seat 30. However, the spring 29 is tared so that this lift is eliminated until the difference between the input pressure and 5 phenomenon in the pressure chamber becomes equal to a predetermined value.
    Starting from this moment, and this constitutes the third phase of the functioning of this variant, each of 3
    The increase in pressure at the inlet is expressed by raising the ball 28 and the passage of liquid directly from the entrance to Cc1 measure 5 pressure, which allows the pressure in the pressure chamber 5 to increase uniformly. The difference between the pressure at the inlet and in the pressure chamber 5 remains constant throughout the third phase.
    0 The use of the invention will improve the speed of the device, since the operation of the pressure modulating valve in this case will depend on the load in
    the brake system will increase the reliability of the brake system in the winter, as the fluid viscosity will decrease due to the constant supply of heat from the brake pads. In addition to toro, the reliability of the brake system increased; due to the lack of a large number of hydraulic connections in the design, due to the fact that the pressure modulation valve is protected from mud and dirt.
    I / 2ff 8
    权利要求:
    Claims (3)
    [1]
    1. BRAKE VEHICLE WHEEL CYLINDER, comprising a housing with feed channels and an opening, inside of which is mounted axially movable in the direction of the brake pads and with the possibility of limiting the volume of the pressure chamber at least one working piston, a pressure modulation valve associated with a pressure chamber, with a pressure source through the supply channels of the housing, and with the possibility of interacting with an elastic return device, characterized in that, in order to increase the speed depending on loads by reducing the response time of the pressure modulation valve, in the working piston there is a radial channel, an annular groove on the side of the housing supply channels and a central blind stepped hole, the central blind stepped hole connected to the ring groove by a radial channel, a larger section of this hole is made from the side of the chamber pressure and a pressure modulation valve is installed in it, and an elastic return device is installed in the smaller one.
    Thebes. 1
    SU <, "1056923 A
    [2]
    2. The cylinder in π. 1, it was molded in that it was equipped with a stop fixed relative to the working piston, and the pressure modulation valve was made in the form of a spring-loaded spherical element and a differential piston with a variable external diameter inside. which has a central blind hole on the side of the pressure chamber and a radial channel connecting the central blind hole of the differential piston with the annular groove of the working piston through the radial channel of the working piston, and a spring-loaded spherical element is installed in the central - blind hole of the differential 'piston, which interacts with the stationary brake stop cylinder, and the elastic return device interacts with a smaller diameter of the differential piston.
    [3]
    3. The cylinder pop. 1, characterized in that it is equipped with a discharge valve, an additional bore of variable diameter is made in the working piston, and a discharge valve is installed in a larger section of this hole from the side of the pressure chamber.
    类似技术:
    公开号 | 公开日 | 专利标题
    US3974896A|1976-08-17|Fail-safe brake for a vehicle
    SU1056923A3|1983-11-23|Brake cylinder for vehicle wheel
    US4024712A|1977-05-24|Fluid pressure control device with a fluid failure alarm for a vehicle brake system
    US3975060A|1976-08-17|Fluid pressure control device with a failure alarm for a vehicle brake system
    US3831491A|1974-08-27|Brake booster
    US3747990A|1973-07-24|Vehicle hydraulic braking system
    US3969000A|1976-07-13|Brake hydraulic pressure control valve
    US3147046A|1964-09-01|Brake pressure proportioning device
    US3315469A|1967-04-25|Pressure proportioning valve
    US1958722A|1934-05-15|Compound hydraulic brake master cylinder
    US3088285A|1963-05-07|Device for varying hydraulic pressure
    US3736031A|1973-05-29|Hydraulic brake fluid pressure proportioning valve
    US3946563A|1976-03-30|Master cylinders for dual hydraulic braking systems
    US3278241A|1966-10-11|Pressure metering valve
    US3469890A|1969-09-30|Reaction means for hydraulic control valve
    JPH0676062B2|1994-09-28|Hydraulic brake actuator
    US3605410A|1971-09-20|Fail-safe vehicle braking system with independent front and rear subassemblies
    US4286504A|1981-09-01|Drum brake actuating device
    US2757640A|1956-08-07|Power actuator for brake
    US2591793A|1952-04-08|Device for adjusting the return travel of fluid actuated means
    EP0236658A1|1987-09-16|Pneumo-hydraulic converter for disc brake callipers
    US3488095A|1970-01-06|Brake pressure control valves
    US3035415A|1962-05-22|Hydraulic brake booster
    US3561215A|1971-02-09|Dual ratio master cylinder
    US3209542A|1965-10-05|Hydraulic brake systems for motor vehicles
    同族专利:
    公开号 | 公开日
    EP0005675A1|1979-11-28|
    FR2426182B1|1982-05-07|
    ES480709A1|1980-01-01|
    JPS54152757A|1979-12-01|
    JPS5914381B2|1984-04-04|
    DE2963804D1|1982-11-11|
    AU534743B2|1984-02-16|
    EP0005675B1|1982-10-06|
    FR2426182A1|1979-12-14|
    AU4722479A|1979-11-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR1488395A|1966-06-02|1967-07-13|Ferodo Sa|Improvements to hydraulic brake installations, in particular for motor vehicles|
    JPS491901A|1972-04-24|1974-01-09|
    JPS491902A|1972-04-24|1974-01-09|
    DE2310383B2|1973-03-02|1980-08-21|Volkswagenwerk Ag, 3180 Wolfsburg|Pressure retaining valve|
    JPS507425U|1973-05-21|1975-01-25|DE3022642C2|1980-06-18|1991-09-12|Alfred Teves Gmbh, 6000 Frankfurt, De|
    AU7429481A|1980-08-23|1982-03-04|Lucas Industries Limited|Hydraulic actuator including proportioning valve|
    JPS5745465U|1980-08-29|1982-03-12|
    FR2496027B1|1980-12-11|1985-06-07|Dba|DRUM BRAKE WITH REGULATED TORQUE AND TORQUE REGULATING VALVE FOR SUCH A BRAKE|
    DE3049338C2|1980-12-29|1992-01-09|Alfred Teves Gmbh, 6000 Frankfurt, De|
    GB9001566D0|1990-01-23|1990-03-21|Gen Motors France|Disc brake|
    KR100420752B1|1995-06-20|2004-10-22|에이비 볼보|Disc brakes for cars|
    EP2014948B1|2007-06-11|2016-03-23|Akebono Brake Industry Co., Ltd.|Drum brake apparatus|
    JP4908371B2|2007-06-11|2012-04-04|曙ブレーキ工業株式会社|Drum brake device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7814943A|FR2426182B1|1978-05-19|1978-05-19|
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