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US 6,604,913 B2Granted
Vane pump
AssigneeShowa Corporation
InventorsKazuhiko Koyama, Katsuya Arakawa, Isamu Kikuchi
Life of this patent
Estimating the term…
Abstract
In a vane pump, a bottom surface of a suction side low pressure passage is set to be below a bottom surface of a return passage of a flow control valve in a cross portion between the return passage and the low pressure passage.
Claims14
A vane pump comprising:
- a rotor fixed to a pump shaft inserted into a pump casing so as to be rotated;
- a multiplicity of vanes within a pump chamber;
- wherein said rotor moves said vanes in a radial direction within the pump chamber and pressurizes a working fluid sucked into the pump chamber so as to discharge;
- a flow control valve having a return passage with a crossing portion;
- a discharge side high pressure passage communicated with the pump chamber;
- a suction side low pressure passage communicated with the pump chamber;
- said low pressure passage having a flat bottom surface;
- wherein said flow control valve returns a surplus of working fluid in the discharge side high pressure passage to the suction side low pressure passage;
- said low pressure passage is in communication with said return passage;
- and
- the flat bottom surface of said low pressure passage is lower than a bottom surface of said return passage.
8 more elements
A vane pump comprising:
- a rotor fixed to a pump shaft inserted into a pump casing so as to be rotated;
- a multiplicity of vanes within a pump chamber;
- wherein said rotor moves said vanes in a radial direction within the pump chamber and pressurizes a working fluid sucked into the pump chamber so as to discharge;
- a flow control valve having a return passage with a crossing portion;
- a discharge side high pressure passage communicated with the pump chamber;
- a suction side low pressure passage communicated with the pump chamber;
- wherein said flow control valve returns a surplus of working fluid in the discharge side high pressure passage to the suction side low pressure passage;
- said suction side low pressure passage has a suction well;
- said suction well comprising a flat bottom surface formed in a flat surface and a side wall;
- said suction well punched in the pump casing and said suction well sucks the working fluid from a reservoir tank via a suction pipe;
- said return passage punched in the pump casing, said return passage is crossed to the suction well;
- the crossing portion is in communication with the side wall of the suction well;
- and
- the bottom surface of the suction well is lower than a bottom surface of said crossing portion.
11 more elements
A vane pump comprising:
- a rotor fixed to a pump shaft inserted into a pump casing so as to be rotated;
- a multiplicity of vanes within a pump chamber;
- wherein said rotor moves said vanes in a radial direction within the pump chamber and pressurizes a working fluid sucked into the pump chamber so as to discharge;
- a flow control valve having a return passage with a crossing portion;
- a discharge side high pressure passage communicated with the pump chamber;
- a suction side low pressure passage communicated with the pump chamber;
- said low pressure passage having a flat bottom surface;
- wherein said flow control valve returns a surplus of working fluid in the discharge side high pressure passage to the suction side low pressure passage;
- said low pressure passage is in communication with said return passage;
- the flat bottom surface of said low pressure passage is lower than a bottom surface of said return passage;
- said suction side low pressure passage has a suction well;
- said suction well is punched in the pump casing and said suction well sucks the working fluid from a reservoir tank via a suction pipe;
- said suction well is in communication with said return passage;
- and
- said surplus working fluid is returned to said suction well.
12 more elements
A vane pump comprising:
- a rotor fixed to a pump shaft inserted into a pump casing so as to be rotated;
- a multiplicity of vanes within a pump chamber;
- wherein said rotor moves said vane in a radial direction within the pump chamber and pressurizes a working fluid sucked into a pump chamber so as to discharge;
- a flow control valve having a return passage with a crossing portion;
- a discharge side high pressure passage communicated with the pump chamber;
- a suction side low pressure passage communicated with the pump chamber;
- said low pressure passage having a flat bottom surface;
- wherein said flow control valve returns a surplus of working fluid in the discharge side high pressure passage to the suction side low pressure passage;
- said low pressure passage is in communication with said return passage;
- the flat bottom surface of said low pressure passage lower than is a bottom surface of said return passage;
- and
- wherein said return passage is punched in the pump casing.
9 more elements
A vane pump comprising:
- a rotor fixed to a pump shaft inserted into a pump casing so as to be rotated;
- a multiplicity of vanes within a pump chamber;
- wherein said rotor moves said vane in a radial direction within the pump chamber and pressurizes a working fluid sucked into a pump chamber so as to discharge;
- a flow control valve having a return passage with a crossing portion;
- a discharge side high pressure passage communicated with the pump chamber;
- a suction side low pressure passage communicated with the pump chamber;
- said low pressure passage having a flat bottom surface;
- wherein said flow control valve returns a surplus of working fluid in the discharge side high pressure passage to the suction side low pressure passage;
- said low pressure passage is in communication with said return passage;
- the flat bottom surface of said low pressure passage is lower than is a bottom surfaces said return passage;
- and
- wherein said surplus working fluid is unpressurized when it is returned to the suction side low pressure passage.
9 more elements
Dependencies are inferred from the claim text.