VANE PUMP
First Claim
1. A vane pump comprising:
- a rotor adapted to be rotated by a drive shaft, the rotor including a plurality of slots at an outside periphery of the rotor;
a plurality of vanes mounted in corresponding ones of the slots, and adapted to project from, and travel inwards and outwards of the corresponding slots;
a cam ring adapted to be eccentric with respect to the rotor, the cam ring surrounding the rotor; and
a plate arranged to face an axial end of the rotor, and define a plurality of pump chambers in cooperation with the rotor, the vanes, and the cam ring, wherein the plate includes at a side facing the rotor;
a suction port opened in a suction region in which each pump chamber gradually expands while moving along with rotation of the rotor;
a discharge port opened in a discharge region in which each pump chamber gradually contracts while moving along with rotation of the rotor;
a first back pressure port arranged to receive a suction-side fluid pressure, and hydraulically communicate with a proximal end portion of at least a first one of the slots corresponding to a first one of the vanes positioned in the suction region; and
a second back pressure port arranged to hydraulically communicate with a proximal end portion of at least a second one of the slots corresponding to a second one of the vanes whose distal end portion is positioned at a terminal end portion of the suction port, wherein the second back pressure port includes;
a first portion arranged to receive a discharge-side fluid pressure; and
a throttling portion arranged to restrict a flow of fluid between the first portion and the proximal end portion of the second slot.
1 Assignment
0 Petitions
Accused Products
Abstract
A vane pump includes: a rotor with slots; vanes mounted in the slots, and adapted to project from the slots; a cam ring surrounding the rotor; and a plate defining pump chambers in cooperation with the rotor, vanes and cam ring. The plate includes: a suction port; a discharge port; a first back pressure port that receives a suction-side fluid pressure, and hydraulically communicates with a first back pressure chamber corresponding to a first vane positioned in a suction region; and a second back pressure port that hydraulically communicates with a second back pressure chamber corresponding to a second vane whose distal end portion is positioned at a terminal end portion of the suction port. The second back pressure port includes: a first portion arranged to receive a discharge-side fluid pressure; and a throttling portion for restricting a fluid flow between the first portion and second back pressure chamber.
-
Citations
9 Claims
-
1. A vane pump comprising:
-
a rotor adapted to be rotated by a drive shaft, the rotor including a plurality of slots at an outside periphery of the rotor; a plurality of vanes mounted in corresponding ones of the slots, and adapted to project from, and travel inwards and outwards of the corresponding slots; a cam ring adapted to be eccentric with respect to the rotor, the cam ring surrounding the rotor; and a plate arranged to face an axial end of the rotor, and define a plurality of pump chambers in cooperation with the rotor, the vanes, and the cam ring, wherein the plate includes at a side facing the rotor; a suction port opened in a suction region in which each pump chamber gradually expands while moving along with rotation of the rotor; a discharge port opened in a discharge region in which each pump chamber gradually contracts while moving along with rotation of the rotor; a first back pressure port arranged to receive a suction-side fluid pressure, and hydraulically communicate with a proximal end portion of at least a first one of the slots corresponding to a first one of the vanes positioned in the suction region; and a second back pressure port arranged to hydraulically communicate with a proximal end portion of at least a second one of the slots corresponding to a second one of the vanes whose distal end portion is positioned at a terminal end portion of the suction port, wherein the second back pressure port includes; a first portion arranged to receive a discharge-side fluid pressure; and a throttling portion arranged to restrict a flow of fluid between the first portion and the proximal end portion of the second slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification