WO2017208208A1 - Vanne destinée à être utilisée avec un système d'actionnement d'embrayage pneumatique - Google Patents

Vanne destinée à être utilisée avec un système d'actionnement d'embrayage pneumatique Download PDF

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Publication number
WO2017208208A1
WO2017208208A1 PCT/IB2017/053287 IB2017053287W WO2017208208A1 WO 2017208208 A1 WO2017208208 A1 WO 2017208208A1 IB 2017053287 W IB2017053287 W IB 2017053287W WO 2017208208 A1 WO2017208208 A1 WO 2017208208A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
clutch actuator
disposed
pressure
valve
Prior art date
Application number
PCT/IB2017/053287
Other languages
English (en)
Inventor
Knut Tore LJØSNE
Original Assignee
Kongsberg Automotive As
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 Kongsberg Automotive As filed Critical Kongsberg Automotive As
Publication of WO2017208208A1 publication Critical patent/WO2017208208A1/fr

Links

Classifications

    • 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
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • 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
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0221—Valves for clutch control systems; Details thereof

Definitions

  • the clutch actuator typically includes a movable internal piston disposed in a chamber. Leakage can cause a slow pressure buildup in the pressure circuit, until pressure within the chamber reaches an operational pressure causing undesired movement of the clutch actuator to move from a disengaged position to an engaged position followed by undesired shifting of the transmission. As such, it is desirable to reduce or eliminate such pressure buildup.
  • One example of the present invention provides a pneumatic clutch actuation system including a clutch actuator, which has a pressure housing and an actuator.
  • the actuator is movable within the pressure housing between an engaged position when the pressure housing receives air at a pressure that is at or above an operational pressure and a disengaged position when the actuator receives air at a pressure that is below the operational pressure.
  • the system further includes a supply valve fluidly connected to the clutch actuator.
  • the supply valve is movable between an open supply position for flowing air to the pressure housing of the clutch actuator at a supply flow valve is further movable to a closed supply position to prevent air from flowing to the pressure housing of the actuator such that that the actuator is disposed in the disengaged position.
  • a valve housing is coupled to one of the supply valve and the pressure housing of the actuator.
  • the valve housing defines an inlet, an outlet, a first seat, and a second seat with a cavity disposed between the first and second seats.
  • the system has a plunger mounted to the valve housing and disposed in a first closed position engaged with the first seat when the supply valve is disposed in the closed supply position.
  • a biasing device continuously biases the plunger to the first closed position.
  • the plunger moves from the first closed position to an open position spaced between the first and second seats to bleed air from at least one of the supply valve and the pressure housing and through the inlet, the cavity, and the outlet at a bleeding flow rate below the supply rate such that the clutch actuator remains disposed in the disengaged position when the supply valve is disposed in the closed supply position.
  • the plunger moves from the open position to a second closed position engaged with the second seat when the supply valve is disposed in the open supply position such that the clutch actuator is disposed in the engaged position.
  • Figure 1 is a schematic view of one embodiment of a pneumatic clutch actuation system having a valve in accordance with the invention for controlling bleeding air from the pneumatic clutch actuation system.
  • Figure 3 is a cross-sectional view of the valve of Figure 2.
  • Figure 4 is an exploded view of the valve of Figure 2, showing the valve including a valve housing and a plunger movable within the valve housing.
  • Figure 5 A is an enlarged perspective view of the plunger of Figure 4.
  • Figure 5B is top elevation view of the plunger of Figure 5 A.
  • Figure 5C is a side view of the plunger of Figure 5A.
  • Figure 5D is another side view of the plunger of Figure 5C, illustrating the plunger of Figure 5C rotated 90 degrees.
  • Figure 5E is a bottom elevation view of the plunger of Figure 5 A.
  • Figure 6A is a cross-sectional view of the valve as taken along a cross-sectional line 6A of Figure 3, illustrating the plunger disposed in a first closed position.
  • Figure 6B is a cross-sectional view of the valve of Figure 3, disposed 90 degrees relative to the plunger of Figure 6A.
  • Figure 7A is a cross-sectional view of the valve of Figure 3, illustrating the plunger disposed in an open position.
  • Figure 7B is a cross-sectional view of the valve of Figure 3, disposed 90 degrees relative to the plunger of Figure 7A.
  • Figure 8A is a cross-sectional view of the valve of Figure 3, illustrating the plunger disposed in a second closed position.
  • Figure 8B is a cross-sectional view of the valve of Figure 3, disposed 90 degrees relative to the plunger of Figure 8A.
  • Figure 9 is an exemplary chart of valve flow for the valve of Figure 2 as a function DETAILED DESCRIPTION OF THE INVENTION
  • a pneumatic clutch actuation system 100 includes a valve 102 to control pressure in a clutch actuator 104 for a powertrain component (not shown). More specifically, the valve 102 can bleed air from the pneumatic clutch actuation system 100 and prevent a leak or slow buildup of pressure from inadvertently causing the clutch actuator to actuate the powertrain component.
  • the powertrain component can be a transmission
  • the clutch actuator 104 can be pneumatically controlled to move a component of the transmission, such as gears or clutches (not shown).
  • the fluid may pass through the valve 102 and in the sealed configuration, fluid is restricted from flowing through the valve 102.
  • the valve configuration depends on pressure in the system 100. When pressure in the system 100 is below the vent pressure A, the valve 102 will be sealed. When pressure in the system 100 is below the operation pressure B and the operation pressure B, the valve 102 will be sealed.
  • the valve 102 will be sealed at low pressures, which allows the system 100 to have a negative or vacuum pressure.
  • one embodiment of the pneumatic clutch actuation system 100 includes an air supply 106 and the clutch actuator 104 having a pressure housing 108 and an actuator 110 movable within said pressure housing 108.
  • the actuator is movable between an engaged position when the pressure housing 108 receives air from the air supply 106 at a pressure that is at or above an operational pressure and a disengaged position when the actuator 110 receives air at a pressure that is below the operational pressure.
  • the pneumatic clutch actuation system 100 can further include a supply valve 102 fluidly connected to the clutch actuator 104.
  • the supply valve 102 can be movable between an open supply position for flowing air from the air supply 106 to the pressure housing 108 of the clutch actuator 104 at a supply flow rate to obtain the operational pressure and move the actuator 110 to the engaged position.
  • the supply valve 102 can be further movable to a closed supply position to prevent air from flowing from the air supply 106 to the pressure housing 108 of the actuator 110 such that the actuator 110 is disposed in the disengaged position.
  • the pneumatic clutch actuator system 100 can leak air around the supply valve 102 to the pressure housing 108, which could inadvertently increase the pressure of the air within the pressure housing 108.
  • the leakage of air is schematically shown in Figures 1 and 7A as passage 112. Passage 112 can be caused by a number of different factors, including wear of certain components of the supply valve.
  • the valve 102 can include a valve housing 114 coupled to the supply valve 102 or the pressure housing 108 of the actuator 110.
  • the valve housing 114 can define an inlet 116, an second seats 120, 122.
  • the valve housing 114 includes a first housing portion 126 having the first seat 120 and a second housing portion 128 coupled to the first housing portion 126 and having the second seat 122.
  • the first housing portion 126 can define a socket 130 with an internal threaded fastener 132
  • the second housing portion 128 can define a plug 134 with an external threaded fastener 136 engaging the internal threaded fastener 132 of the socket 130.
  • the first housing portion 126 can have a groove 138 and a seal 139 disposed within the groove 138 and sandwiched between the first and second housing portions 126, 128. Moreover, the first housing portion 126 can be an integral part of the supply valve 102 or an integral part of the pressure housing 108 of the clutch actuator 104. However, it is contemplated that the first housing portion can be a component of the valve housing that is separate from the supply valve and pressure housing and mounted to either one of the supply valve or the pressure housing.
  • the valve housing 114 can define a plurality of passages fluidly connected with one another for flowing air from the inlet 116 to the outlet 118 when the valve 102 is opened.
  • the valve housing 114 can include a first guiding bore 140 fluidly connected to the inlet 116 for flowing air from the inlet 116 to the first guiding bore 140.
  • the first seat 120 can be an annular ridge 142 coupled to the valve housing 114 and surrounding the first guiding bore 140.
  • the first seat can be a seal or O-ring mounted to the valve housing or other suitable seats.
  • the valve housing 114 may further define a flow regulating bore 144 fluidly connected to the first guiding bore 140 to flow air from the first guiding bore 140 to the flow regulating bore 144 when the valve 102 is open.
  • the cavity 124 can be fluidly connected to the flow regulating bore 144 to flow air from the flow regulating bore 144 to the cavity 124 when the valve 102 is open.
  • the valve housing 114 can further include second guiding bore 146, which is in turn fluidly connected to the outlet 118 for flowing air to through the outlet 118.
  • the second seat 122 can be an annular ridge 148 coupled to the valve housing 114 and surrounding the second guiding bore 146. Similar to the first seat, other embodiments of the second seat may be an O-ring mounted to the housing or any other suitable seat.
  • the valve 102 can further include a plunger 150 mounted to the valve housing 114 and disposed in a first closed position engaged with the first seat 120 when the supply valve 102 is disposed in the closed supply position.
  • the plunger 150 can have a first shoulder 152 engaging the first seat 120 when the plunger 150 is disposed in the first closed position.
  • This first shoulder 152 can have a frustroconical surface 154 deflecting air radially outward to facilitate moving the plunger 150 along a longitudinal axis 156 of the cavity 124 from the open position to the second closed position.
  • the first shoulder can instead be a planar annular flange or any other suitable structure that engages the first seat to prevent the flow of air through the valve.
  • the plunger 150 is movable within the valve housing 114 from the first closed position to an open position spaced between the first and second seats 120, 122 to bleed air from the supply valve 102 and/or the pressure housing 108 through the inlet 116, the cavity 124, and the outlet 118 at a bleeding flow rate below the supply rate, such that the clutch actuator 104 remains disposed in the disengaged position when the supply valve 102 is disposed in the closed supply position.
  • the plunger 150 can have a first guiding end 158 sliding along the valve housing 114 and hold the plunger 150 concentrically within the valve housing 114 to maintain passages defined between the plug 134 and the valve housing 114 and allow the without the plunger becoming misaligned and obstructed from moving to any one of the positions.
  • the first guiding end 158 can define at least one passage 160 fluidly connecting the first guiding bore 140 to the flow regulating bore 144 when the plunger 150 is disposed in the open position.
  • the first guiding end 158 can comprise a tip 162, and the passage 160 can comprise a channel 164 extending diametrically across the tip 162 and fluidly communicating with the first guiding bore 140.
  • the first guiding end 158 can further include a neck 166 coupled to the tip 162 and defining one or more annular grooves 168 fluidly connected to the channel 164 to flow air from the first guiding bore 140 and through the channel 164 and groove 168 to the flow regulating bore 144 when the plunger 150 is disposed in the open position.
  • the flow regulating bore 144 of the valve housing 114 can have an inner diameter surface 170
  • the plunger 150 can further comprise a first cylindrical portion 172 coupled to the first shoulder 152 and having an outer diameter surface 174 facing the inner diameter surface 170 of the flow regulating bore 144 to define an annular gap 176 between the first cylindrical portion 172 and the flow regulating bore 144 for flowing air through the annular gap 176 when said plunger is disposed in the open position.
  • the annular gap 176 is remains constant when the plunger 150 moves between the first closed position, the open position, and the second closed position because the first guiding end 158 and the first guiding bore 140 hold the plunger 150 concentrically within the valve housing 114 as the plunger 150 moves between the first closed position, the open position, and the second closed position.
  • the plunger 150 can define a plurality of vent notches 178 spaced apart from one another along the surface of the plunger 150, with the vent notches 178 being fluidly connected to the annular gap 176 and the cavity 124 to flow air from the gap 176 to the cavity 124 when the plunger 150 is disposed in the open position.
  • the channel 164 can have a longitudinal axis 156, respect to the longitudinal axis 156 to facilitate flow from said channel 164 through the vent notches 178.
  • two of the vent notches 182 are spaced from the other vent notches 184 relative to the longitudinal 156 and smaller than the other vent notches 184, which are disposed farther from the channel, in order to distribute the flow of air around the plunger 150 into the cavity 124 when the plunger 150 is moved to the open position.
  • the first shoulder 152 is spaced apart from the first seat 120
  • the plunger 150 has a second shoulder 186 spaced apart from the second seat 122 to direct flow from the cavity toward the outlet 118.
  • the second shoulder 186 can have a frustroconical surface 188 directing air radially inward to the outlet 118 of the valve housing 114 when the plunger 150 is disposed in the open position.
  • the plunger 150 can have a second guiding end 190 sliding along the valve housing 114 within the second guiding bore 146 to facilitate the first guiding end 158 and first guiding bore 140 with holding the cylindrical portion 172 of the plunger 150 concentrically within the flow regulating bore 144 and define a constant annular gap 176 as the plunger 150 moves between the first closed position, the open position, and the second closed position.
  • the second guiding end 190 defines one or more passages 192 fluidly connecting the cavity 124 to the second guiding bore 146 and the outlet 118 when the plunger 150 is disposed in the open position.
  • the second guiding end 190 can include a tip 194, and the passages 192 can comprise a channel 196 extending diametrically across the tip 194 and fluidly communicating the cavity 124 and second guiding bore 146 with one another and to flow air from the cavity 124 through the channel 164 to the outlet 118 when the plunger 150 is disposed in the open position.
  • the tip 194 is slidably secured to the valve housing 114.
  • the tip 194 comprises at least one detention barb 198 attaching the plunger 150 to the valve housing 114 and extending beyond a diameter of the second guiding bore 146 to engage the valve housing 114 and prevent the plunger 150 from being removed from the valve 102.
  • the valve 102 can further include a biasing device 200 continuously biasing the plunger 150 to the first closed position.
  • the biasing device 200 comprises a first spring 202 coupled to the plunger 150 to move the plunger 150 to the first closed position when the pressure is below a vent pressure for preventing air from flowing through the cavity 124 and the outlet 118.
  • the biasing device 200 can further comprise a second spring 204 engaging the plunger 150 when the plunger 150 is disposed in the open position or the second closed position, with the first and second springs 202, 204 holding the plunger 150 in the open position when the pressure is above the vent pressure and below the operational pressure for flowing air through the inlet 116, the cavity 124, and the outlet 118 of the valve housing 114.
  • the second spring 204 can be disposed concentrically about the first spring 202, and the first spring 202 is disposed concentrically about the plunger 150.
  • the valve 102 can further include a spring seat 206 coupled to the second spring 204 such that the second spring 204 continuously biases the spring seat 206 to engage at least one of the valve housing 114 and the plunger 150.
  • the spring seat 206 can have a first side 208 engaging the valve housing 114 when the plunger 150 is disposed in the first closed position and engaging the plunger 150 when the plunger 150 is disposed in one of the open position and the second closed position, and the spring seat 206 further has a second side 210 coupled to the second spring 204.
  • the plunger 150 has an outside diameter, with the spring seat 206 having an outer diameter that is larger than said outside diameter of said plunger, and the spring seat has an inner diameter that is between the inner and outer diameters of the spring seat 206.
  • the spring seat 206 further has an outer surface 212 sliding along the valve housing 114 within the cavity 124 when the plunger 150 moves between the open position and the second closed position.
  • the spring seat 206 is disposed concentrically about the first spring 202, and the first spring 202 is disposed concentrically about the plunger 150.
  • the plunger 150 can move from the open position to the second closed position engaged with the second seat 122 when the supply valve 102 is moved to the open supply position such that the air flows from the air supply 106 to the clutch actuator 104 at the supply flow rate to obtain the operational pressure and dispose the clutch actuator 104 in the engaged position.
  • One embodiment of a method for operating the pneumatic clutch actuation system 100 of Figures 1-9 begins with the step of moving the supply valve 102 to the closed supply position, and moving the exhaust valve 102 to the open exhaust position to decrease pressure within the pressure housing 108 of the clutch actuator and disengage the clutch.
  • air can flow through the passage 112 formed in or around the supply valve 102 to the pressure housing 108 of the clutch actuator 104, when the supply valve remains in the closed supply position.
  • the flow or leak of air into the pressure housing 108 can build up pressure within the pressure housing 108.
  • the passage 112 may be formed by a worn or damaged seal of the supply valve 102 or other worn or defective component in the supply valve 102, such that air flows through the passage 112 while the supply valve remains in the closed supply position.
  • the biasing device 200 holds the plunger 150 in the first closed supplied to the clutch actuator 104 builds to or above the vent pressure and below the operational pressure, the plunger 150 moves from the first closed position to the open position and air flows from the inlet 116 through the cavity 124 and the outlet 118 to bleed air from the pneumatic clutch actuation system and prevent unintentional activation of the clutch actuator 104.
  • the supply valve 102 is moved to the open supply position and the pressure of air supplied to the clutch actuator 104 is at or above the operational pressure, the plunger 150 moves from the open position to the second closed position to in turn move the clutch actuator 104 from the disengaged position to the engaged position.
  • pressure in the pressure circuit controls the position of the plunger.
  • the plunger When pressure in the pressure circuit is below the vent pressure A, the plunger will be in the first position and the valve assembly will be sealed. In the first position, the valve assembly is sealed, which allows for a vacuum in the pressure circuit.
  • the plunger When pressure in the pressure circuit is below the operation pressure B and above the vent pressure A, the plunger will be in the second position and the valve assembly will be vented.
  • pressure in the pressure circuit is above the operation pressure B, the plunger will be in the third position and the valve assembly will be sealed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

Un mode de réalisation de l'invention concerne un système d'actionnement d'embrayage pneumatique, lequel système comprend un boîtier de vanne qui définit une entrée, une sortie, un premier siège et un second siège, une cavité étant disposée entre les premier et second sièges. Un plongeur est monté sur le boîtier de vanne et est disposé dans une première position fermée en prise avec le premier siège quand une vanne d'alimentation est disposée dans une position d'alimentation fermée. Un dispositif de sollicitation sollicite le plongeur vers la première position fermée. Le plongeur se déplace à partir de la première position fermée jusqu'à une position ouverte espacée entre les premier et second sièges pour purger de l'air à travers l'entrée, la cavité et la sortie à un débit d'écoulement de purge. Le plongeur se déplace à partir de la position ouverte jusqu'à une seconde position fermée en prise avec le second siège quand la vanne d'alimentation est disposée dans une position d'alimentation ouverte de telle sorte qu'un actionneur d'embrayage est disposé dans une position en prise.
PCT/IB2017/053287 2016-06-02 2017-06-02 Vanne destinée à être utilisée avec un système d'actionnement d'embrayage pneumatique WO2017208208A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662344750P 2016-06-02 2016-06-02
US62/344,750 2016-06-02

Publications (1)

Publication Number Publication Date
WO2017208208A1 true WO2017208208A1 (fr) 2017-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/053287 WO2017208208A1 (fr) 2016-06-02 2017-06-02 Vanne destinée à être utilisée avec un système d'actionnement d'embrayage pneumatique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057607A (en) * 1979-09-03 1981-04-01 Saab Scania Ab Arrangement for Blocking a Vehicle Clutch
EP0344039A1 (fr) * 1988-05-27 1989-11-29 RENAULT VEHICULES INDUSTRIELS Société Anonyme dite: Dispositif d'assistance pneumatique de commande d'embrayage
DE19717486A1 (de) * 1997-04-25 1998-10-29 Fte Automotive Gmbh Pneumatischer Druckverstärker für eine hydraulische Anlage
EP1344949A2 (fr) * 2002-03-12 2003-09-17 WABCO GmbH & Co. OHG Agencement de soupape pour un vérin
WO2009092395A1 (fr) * 2008-01-24 2009-07-30 Kongsberg Automotive As Système de vérin pneumatique et sa méthode de commande

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057607A (en) * 1979-09-03 1981-04-01 Saab Scania Ab Arrangement for Blocking a Vehicle Clutch
EP0344039A1 (fr) * 1988-05-27 1989-11-29 RENAULT VEHICULES INDUSTRIELS Société Anonyme dite: Dispositif d'assistance pneumatique de commande d'embrayage
DE19717486A1 (de) * 1997-04-25 1998-10-29 Fte Automotive Gmbh Pneumatischer Druckverstärker für eine hydraulische Anlage
EP1344949A2 (fr) * 2002-03-12 2003-09-17 WABCO GmbH & Co. OHG Agencement de soupape pour un vérin
WO2009092395A1 (fr) * 2008-01-24 2009-07-30 Kongsberg Automotive As Système de vérin pneumatique et sa méthode de commande

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