Pressure regulating valve
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTsukuo Ishitoya, Nobuo Kobayashi, Nobuyuki Ogami, Akira Yamashita
Life of this patent
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Abstract
In order to achieve seal durability and bring about a damping action for a piston-type pressure regulating valve, a pressure regulating valve of the present invention is characterized by a valve moving member moving in such a manner as to cause communication or block communication between a primary chamber and a secondary chamber within a case, wherein a plurality of central members are arranged between the case and the valve moving member and the plurality of central members are taken to be different materials. It is then possible to bring about both a damping action and seal durability using the central members by providing central members of different materials.
Claims12
A pressure regulating valve, comprising:
- a case that includes a primary chamber and a secondary chamber;
- a valve moving member that includes a piston and a valve element, wherein:
- the valve moving member moves in such a manner as to cause communication or block communication between the primary chamber and the secondary chamber within the case, and
- a first end of the piston faces the secondary chamber and a second end of the piston faces a reference pressure chamber;
- a plurality of seal members arranged between said case and said valve moving member, wherein:
- a first one of said plurality of seal members is a ring-type damper primarily made of rubber material and configured to attenuate an extent of movement of said valve moving member, and a second one of said plurality of seal members is a ring-type seal primarily made of a polymer material,
- the first one and the second one of said plurality of seal members are arranged between a radially-outward-facing surface of said piston and a radially-inward-facing wall of said case,
- the rubber material has a larger resistance to sliding relative to the polymer material, and the ring-type damper has a larger damping action relative to the ring-type seal, and
- the polymer material has a smaller resistance to sliding relative to the rubber material, and the ring-type seal has higher durability relative to the ring-type damper;
- and
- communicating means for causing a space and said reference pressure chamber to communicate, wherein:
- the space is defined by said radially-outward-facing surface of said piston, said radially-inward-facing wall of said case, and said plurality of seal members,
- the communicating means is formed in a body of the case,
- the communicating means is configured to connect the space and the reference pressure chamber such that a pressure of the space is regulated when the piston moves,
- the communicating means is positioned in the body of the case such that the communication means and one of the first one and the second one of the plurality of seal members on a side of said reference pressure chamber do not overlap when the piston moves, and
- the ring-type damper and the ring-type seal are slidable relative to the radially-inward-facing wall of said case and the communication means.
Dependencies are inferred from the claim text.