Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D5/00—Power-assisted or power-driven steering
  • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
  • B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
  • B62D5/083—Rotary valves

Definitions

• the present invention relates to a rotary hydraulic distributor comprising first and second distribution members capable of undergoing relative rotation, and sealing means, the first distribution member adopting an at least partially cylindrical shape with axial symmetry and adjusting rotationally inside a bore of complementary shape of the second distribution member, each of the first and second distribution members comprising at least first and second pressure chambers spaced apart from one another in an axial direction and subjected to respective pressures, the difference of which is variable, each chamber of each dispensing member being capable of being located opposite the corresponding chamber of the other dispensing member to be subjected to the same pressure as it, and the means sealing comprising: a peripheral annular groove made in the first distri bution, a deformable annular seal insulating from each other, in an axial direction, the first and second pressure chambers, and an annular pressing member bearing on the internal surface of said bore to press the deformable seal inside the throat.
• Distributors of this type are capable of receiving various applications but are in particular used, in a known manner, in power steering systems for motor vehicles, as shown for example by US Patents 4,527,591 and EP 0 112 201.
• these distributors are of relatively large structural complexity, therefore of relatively high manufacturing cost, and it would be desirable to be able to simplify them and reduce the manufacturing cost.
• the aim of the present invention is to solve at least one of the problems previously mentioned.
• the dispenser of the invention is essentially characterized in that the annular groove which receives the deformable seal communicates with the second pressure chamber of the first dispensing member, forms the periphery of this chamber and adopts a substantially rectangular section, in that the pressing member maintains the deformable seal against the bottom of this annular groove while pressing it against that of the internal lateral walls of this groove which is closest to the first pressure chambers and in that the pressing member is pierced with a bore opposite the second pressure chamber of the second dispensing member.
• the deformable seal is for example a toroidal seal with a circular section at rest.
• this distributor preferably comprises a second deformable seal insulating the second and third pressure chambers and, the pressing member housed in the annular groove at the periphery of the second pressure chamber of the first distribution member ensures the maintenance of this second seal in an equivalent manner to the one for which he maintains the first joint.
• the pressing member then has two chamfers by which it presses the two deformable seals against the two respective circular edges that form the bottom of the annular groove at the periphery of the second pressure chamber of the first distribution member and the two internal side walls of this groove.
• FIG. 2 is a partial longitudinal sectional view of a dispenser according to a first embodiment of the invention.
• FIG. 3 is a partial longitudinal sectional view of a dispenser according to a second embodiment of the invention.
• the hydraulic distributors of the type concerned comprise a first distribution member, for example a metal rotor 1, and a second distribution member, for example a metal stator 2.
• the rotor 1 adopts at least partially the shape of a cylinder of revolution of longitudinal axis 3 shown, for the purposes of the drawing, much closer to the stator 2 than it actually is.
• the rotor 1 adjusts in rotation inside a cylindrical bore 2a of the stator 2, centered on Tax 3 which also constitutes the axis of rotation of the rotor 1.
• the rotor 1 and the stator 2 each comprise at least two pressure chambers, such as 11, 12, 13 and 21, 22, 23, each chamber consisting of any cavity such as groove or channel.
• each of the first, second and third chambers 11, 12 and 13 of the rotor 1 is likely to be located or to be placed opposite the corresponding chamber 21, 22 and 23 of the stator 2 so that the chambers of each pair of corresponding chambers are subjected to the same pressure.
• the deformable seal is an O-ring made of an elasto era and the pressing member 5a, 5b, is made of a material with little deformability and having a low coefficient of friction, and for example PTFE ("TEFLON”) .
• TEFLON PTFE
• the annular groove communicates it with the second pressure chamber 12 of the rotor 1, forms the periphery of this chamber, that is to say extends in the part thereof which is furthest from the axis 3, and adopts, in the plane which contains Tax 3, a substantially rectangular section, the housing offered by this groove therefore comprising a bottom 12a and two internal side walls 12b and 12c.
• the pressing member 5 maintains the deformable seal 4a against the bottom 12a of the groove while pressing it against the internal lateral wall 12b which is closest to the first pressure chambers 11 and 21.
• the pressing member 5 is pierced with a bore 50 facing the second pressure chamber 22 of the stator 2, so as to be able to make communicate this chamber with the second pressure chamber 12 of the rotor 1.
• the pressing member 5 can compress a second deformable seal 4b disposed, relative to the third and second pressure chambers, as Test the first seal 4a relative to the first and second chambers.
• the pressing member 5 then has two chamfers 51a and 51b by means of which it presses the two deformable seals 4a, 4b against the two respective circular edges 12d, 12e formed by the bottom 12a and the two internal lateral walls 12b and 12c of the annular groove on.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Multiple-Way Valves (AREA)
• Sealing Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8277602

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (3)

• 1993
  • 1993-06-04 JP JP6502857A patent/JPH06510259A/ja active Pending
  • 1993-06-04 WO PCT/EP1993/001420 patent/WO1994001316A1/fr not_active Application Discontinuation
  • 1993-06-04 EP EP93912892A patent/EP0603356A1/de not_active Ceased

Non-Patent Citations (1)

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