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US 7,410,346 B2Granted
Oil pump
AssigneeHitachi, Ltd.
InventorDai Niwata
Life of this patent
Estimating the term…
Abstract
An oil pump includes a partition for dividing an outlet port into a first passage section on the upstream side and a second passage section on the downstream side, wherein a discharge passage fluidly communicates with the first passage section, and a relief valve is disposed in the second passage section.
Claims19
An oil pump, comprising:
- a plurality of volume chambers each having a volume varied to inhale and discharge oil;
- inlet and outlet ports, the inlet port being arranged to open over the volume chambers each having an increasing volume, the outlet port being arranged to open over the volume chambers each having a decreasing volume;
- a relief valve which operates when a pressure of oil discharged to the outlet port exceeds a predetermined value, relieving part of oil in the outlet port;
- a partition which divides the outlet port into upstream and downstream sections;
- and
- a discharge passage which fluidly communicates with the upstream section of the outlet port,
- the relief valve being disposed in the downstream section of the outlet ports
- wherein the partition is formed along a flow direction of oil discharged from the outlet port, wherein the discharge passage and the relief valve are disposed adjacent to and parallel to each other with respect to the partition.
5 more elements
A trochoid oil pump, comprising:
- a casing having inlet and outlet ports;
- inner and outer rotors arranged in the casing, the inner and outer rotors comprising external and internal teeth meshed with each other, the internal and external teeth cooperating to define volume chambers therebetween, each volume chamber varying in volume to discharge to the outlet port oil inhaled through the inlet port;
- a partition which divides the outlet port into upstream and downstream sections;
- a discharge passage which fluidly communicates with the upstream section of the outlet port;
- a relief valve which operates when a pressure of oil discharged to the outlet port exceeds a predetermined value, relieving part of oil in the outlet port;
- and
- a throttle arranged between a side face of the outer rotor and an upper edge of the partition which faces the side face, the throttle providing fluid communication between the upstream and downstream sections of the outlet port.
4 more elements
An oil pump, comprising:
- a plurality of volume chambers each having a volume varied to inhale and discharge oil;
- inlet and outlet ports, the inlet port being arranged to open over the volume chambers each having an increasing volume, the outlet port being arranged to open over the volume chambers each having a decreasing volume;
- a relief valve which operates when a pressure of oil discharged to the outlet port exceeds a predetermined value, relieving part of oil in the outlet port;
- partition means for dividing the outlet port into upstream and downstream sections;
- and
- a discharge passage which fluidly communicates with the upstream section of the outlet port,
- the relief valve being disposed in the downstream section of the outlet port,
- wherein the partition means is formed along a flow direction of oil discharged from the outlet port, wherein the discharge passage and the relief valve are disposed adjacent to and parallel to each other with respect to the partition means.
5 more elements
Dependencies are inferred from the claim text.