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
  • 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
  • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
• • 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
  • B60T13/14—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 using accumulators or reservoirs fed by pumps
  • B60T13/148—Arrangements for pressure supply
• • 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
  • B60T13/16—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 using pumps directly, i.e. without interposition of accumulators or reservoirs
  • B60T13/168—Arrangements for pressure supply
• • 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
  • B60T8/404—Control of the pump unit
  • B60T8/4054—Control of the pump unit involving the delivery pressure control
• • 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
  • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
• • 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
  • B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
  • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
  • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
• • 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
  • B60T8/341—Systems characterised by their valves
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/2496—Self-proportioning or correlating systems
  • Y10T137/2559—Self-controlled branched flow systems
  • Y10T137/2574—Bypass or relief controlled by main line fluid condition
  • Y10T137/2605—Pressure responsive
  • Y10T137/2612—Common sensor for both bypass or relief valve and other branch valve
  • Y10T137/2615—Bypass or relief valve opens as other branch valve closes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/2496—Self-proportioning or correlating systems
  • Y10T137/2559—Self-controlled branched flow systems
  • Y10T137/2574—Bypass or relief controlled by main line fluid condition
  • Y10T137/2605—Pressure responsive
  • Y10T137/2617—Bypass or relief valve biased open
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/2496—Self-proportioning or correlating systems
  • Y10T137/2559—Self-controlled branched flow systems
  • Y10T137/2574—Bypass or relief controlled by main line fluid condition
  • Y10T137/2605—Pressure responsive
  • Y10T137/2622—Bypass or relief valve responsive to pressure downstream of outlet valve
  • Y10T137/2627—Outlet valve carried by bypass or relief valve

Definitions

• This invention relates to a valve through which fluid flows from a source to charge an accumulator in a brake system and which allows fluid to flow from the conduit to a reservoir in the absence of flow of fluid from the source.
• a traction control function In brakes systems it has become a common practice to include a traction control function along with anti-lock brake capabilities.
• the traction control function utilizes may of the components necessary to achieve the anti-lock brake capabilities.
• an accumulator is often included in the brake system.
• the accumulator is charged to a desired pressure level by the operation of a pump in the brake system.
• In charging the accumulator fluid is communicated from the pump through a flexible conduit.
• the fluid pressure developed by the pump to charge the accumulator is maintained in the conduit even after the pump has been turned off and as a result after a period of time and under some conditions it is possible that a leak may occur in the flexible conduit.
• the flexible conduit be permanently connected to a reservoir through a restricted orifice.
• This permanent connection allows the fluid pressure in the conduit to bleed to reservoir pressure over a period of time.
• this permanent connection also allows a portion of the fluid supplied to the accumulator by the pump to flow to the reservoir during the charging function and as a result the efficiency of the pump is reduced by this flow to the reservoir.
• the present invention has a valve which allows the entire output of a pump to flow to an accumulator during a charging operation and when the flow from the pump terminates thereafter allows fluid to flow from a flexible conduit to a reservoir.
• the valve has a housing with a first bore therein connected to the pump through an entrance port, to the accumulator through an exit port and to the reservoir through an exhaust port.
• a sleeve located in the first bore has a first end adjacent the entrance port and a second end adjacent the exhaust port.
• a second bore in the sleeve which extends from the first end to the second end has a central diameter section separated from a first end diameter section by a first shoulder and from a second end diameter section by a second shoulder.
• a first ball located in the first end diameter section is urged by a first spring toward the first shoulder.
• a flange on the second end of the sleeve retains a second ball in the second diameter section of the sleeve.
• Linkage located in the central diameter section has a first end, which engages the first ball, and a second end, which engages the second ball.
• a second spring located in the first bore urges the sleeve toward the entrance port to allow the first spring to seat the first ball on the first shoulder.
• An object of this invention is to provide a valve for charging an accumulator and for bleeding a flexible conduit when the accumulator is charged to utilize a full capacity of a pump while limiting the exposure of a conduit to high pressure.
• a further advantage of this invention resides in a valve, which sequentially closes a flow communication path between an exit port and an exhaust port while opening a communication path between an entrance port and the exit port to supply pressurized fluid to an accumulator.
• Figure 1 is a schematic illustration of a brake system having an anti-lock brake system with traction control with a valve to charge an accumulator and exhaust a flexible conduit according to the present invention
• Figure 2 is a sectional view of the valve of Figure 1 with an exit port connected to an exhaust to provide for communication to a reservoir;
• Figure 3 is a sectional view taken along line 3-3 of Figure 2;
• Figure 4 is a sectional view taken along line 4-4 of Figure 2;
• Figure 5 is a section view of the valve in Figure 1 with an entrance port connected to the exit port to provide for communication to an accumulator.
• FIG. 1 A portion of a brake system 10 is illustrated in Figure 1 for a vehicle having an actuation section 1 2 connected to first 14 and second 1 6 wheel brakes.
• the first 14 and second 1 6 wheel brakes each have speed sensors 18, 1 8' which supply information to an ECU 20 for the vehicle and various solenoid valves 1 7, 18 and 17' 18' for performing an anti-lock function.
• a solenoid 19 connected in a supply conduit 22 from a brake booster 34 and an actuation conduit connected to an accumulator 24.
• Solenoid 1 9 is dedicated to performing a traction control function in responds to an input from the ECU 20.
• a pump 32 supplies the accumulator 24 and the brake booster 34 with pressurized fluid to effect a brake application in response to an input applied to pedal 36.
• a pressure switch 38 connected to a supply conduit 40 between the accumulator 24 and brake booster 34 is connected to the ECU 20. Signals from the pressure switch 38 control the operation of pump 32 for the development of pressurized fluid which is communicated through flexible conduit 52 to the supply conduit 40 and accumulator 24. When accumulator 24 is charged to a desired fluid pressure level, pressure switch 38 communicates a signal to the ECU 20 a motor 30 associated with pump 32 is switched to an off mode. In order that the flexible conduit 52 is not continually exposed to high pressure once accumulator 24 is charged, a valve 60 allows fluid in the flexible conduit 52 to be communicated through conduit 53 to reservoir 33 for pump 32.
• valve 60 as shown in Figure 2 has a housing 62 having a first bore 64 therein.
• Housing 62 has an entrance port 66 connected to pump 32 by a conduit 31 , an exit port 68 connected to accumulator 24 by flexible conduit 52 and an exhaust port 70 connected to the reservoir 33 by conduit 29.
• a sleeve 72 is located in bore 64 has a second bore 74 that extends from a first end 76 to a second end 78.
• the second bore 74 has a central diameter section 80 separated from a first end diameter section 82 by a first shoulder 84 and from a second end diameter section 86 by a second shoulder 88.
• the sleeve 72 has a plurality of axial slots 81 , 81 '"-81 n separated by a corresponding plurality of lands 83, ⁇ S'-'-SS" which extend from said first end 76 to shoulder 84 to define the first diameter section 82, see Figure 3.
• a first ball 90 is located in first diameter section 82 and maintained in axial alignment with a charging seat 84' formed by shoulder 84 by lands 83, 83'"-83 n .
• a first spring 93 retained in the first diameter section 82 of bore 74 acts on and urges first ball 90 toward charging seat 84 to define a charging chamber 91 within bore 64.
• the sleeve 72 has a plurality of radial passages 85,85' through which the second diameter section 86 is connected with bore 64 and a second shoulder 87 located adjacent the second end 78.
• a second ball 92 is located in second diameter section 86 and retained in therein by a flange 79 formed by rolling end 78 in the shape of a partial sphere.
• a tri-angular shaped linkage 94 as best-illustrated in Figure 4 is located in the central diameter section 80 has a first end 96 and a second end 98.
• the first end 96 engages the first ball 90 and the second end 98 engages the second ball 92.
• the length of the linkage 94 from the first end 96 to the second end 98 is such that with ball 90 seated on charging seat 84' the second ball 92 extends past end 78 of sleeve 72.
• a second or return spring 100 located in bore 64 acts on shoulder 87 of sleeve 72 for urging sleeve 72 toward the charging chamber 91 and entrance port 60.
• spring 100 moves sleeve 72 toward the charging chamber 91 .
• spring 100 acts on sleeve 72 to move sleeve toward the charging chamber 91 .
• Initial movement of sleeve 72 toward the charging chamber moves charging seat 84' into engagement with ball 90 to interrupt communication from charging chamber 91 to the second bore 74.
• Further movement of sleeve toward the charging chamber 91 brings flange 79 into engagement with ball 92 to move ball 92 off exhaust port 70' and allow fluid to flow to the reservoir 33.
• Check valve 41 located between the flexible conduit 52 and conduit 40 assures that fluid does not flow from the accumulator 24 toward valve 60. Fluid flow from the flexible conduit 52 continues until the pressure level therein is at a value as defined by the force of spring 100. Similarly a check valve 51 in conduit 31 assures that the fluid pressure in charging chamber 91 is not dissipated by the flow of fluid back to pump 32.

Landscapes

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=23466834

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Citations (3)

Family Cites Families (9)

• 1999
  • 1999-08-11 US US09/372,130 patent/US6173730B1/en not_active Expired - Lifetime
• 2000
  • 2000-08-01 WO PCT/US2000/020980 patent/WO2001010696A1/en not_active Ceased
  • 2000-08-01 EP EP00952370A patent/EP1119480B1/en not_active Expired - Lifetime
  • 2000-08-01 DE DE2000627399 patent/DE60027399T2/de not_active Expired - Lifetime
  • 2000-08-01 JP JP2001515181A patent/JP4838960B2/ja not_active Expired - Fee Related

Patent Citations (3)

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