Variable displacement oil pump

a variable-discharge oil pump and oil-type technology, which is applied in the direction of liquid fuel engines, machines/engines, operating means/releasing devices of valves, etc., can solve the problems of large amplitude of discharge pressure, unstable behavior of variable-discharge cam ring operation, and difficulty in obtaining satisfactory engine function, etc., to facilitate sliding movement of valve body, stable discharge operation, and alleviate pressure spike of oil inside the control chamber

Inactive Publication Date: 2020-04-09
YAMADA SEISAKUSHO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a variable displacement oil pump that can suppress hunting, a problem that affects engine function. This is achieved by using a mechanism called a vane pump, which is capable of controlling operation of a cam ring inside the pump chamber to obtain a stable discharge operation. The invention also includes a communication hole in the valve housing to transmit oil pressure from the control chamber to the valves for lubrication purposes, which further facilitates a sliding movement of the valve body and alleviates hunting in the pump. Overall, this invention provides a simple solution for suppressing hunting in a variable displacement oil pump.

Problems solved by technology

In a system in which a control chamber pressure is filled with a discharge pressure, such a pressure spike affects a behavior of a spool valve that operates the cam ring or the like using a hydraulic pressure and a pressure of the control chamber as a control target, so that a behavior of the variable operation of the cam ring becomes unstable, and a phenomenon in which the discharge pressure (amount) has a large amplitude occurs.
This phenomenon is called “hunting” and may affect a discharge function of the oil pump and make it difficult to obtain a satisfactory engine function.

Method used

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  • Variable displacement oil pump
  • Variable displacement oil pump
  • Variable displacement oil pump

Examples

Experimental program
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Effect test

second embodiment

[0069]Similar to the second embodiment, for communication between the valve housing 811 of the solenoid valve 81 and the communication hole 7 of the control chamber 12, the communication passage 7a and the solenoid valve chamber 811a communicate with each other (see FIG. 11). Here, the communication hole 7 is formed in a non-reaching region 811b, that is, a portion of the solenoid valve chamber 811a where the solenoid valve body 812 does not reach (see FIGS. 7C, 10A and 10B).

[0070]In other words, the non-reaching region 811b is a cavity portion formed between a tip of the solenoid valve body 812 and the solenoid valve chamber 811a when the solenoid valve body 812 moves and stops at the maximum position in the axial direction by virtue of the electromagnetic action of the solenoid control unit 813. In addition, a through-hole 814 for discharging the oil to the outside is formed in the non-reaching region 811b of the solenoid valve body 812 of the solenoid valve chamber 811a, so that ...

first embodiment

[0072]Next, a variable displacement oil pump according to the present invention obtained by applying an inscribed gear type rotor portion 2A to the first embodiment described above will be described with reference to FIG. 12. The rotor portion 2A includes an inner rotor 26 and an outer rotor 27 (see FIG. 12). A shaft hole of the drive shaft 24 is formed in the pump chamber 11, and an inlet port 11a and an outlet port 11b are formed around the shaft hole.

[0073]A first seal land 11c is provided between a terminated end of the inlet port 11a and a start end of the outlet port 11b, and a second seal land 11d is provided between a terminated end of the outlet port 11b and a start end of the inlet port 11a. The control chamber 12 continuous to the pump chamber 11 is formed in the pump housing 1 and is placed in the operational protrusion 211 of the cam ring 21 as described below. The rotor portion 2A including the inner rotor 26 and the outer rotor 27 and the cam ring 21 are housed in the...

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Abstract

To provide a rotor portion 2A; a cam ring 21 having a rotor chamber 21a; a pump housing 1 provided with a pump chamber 11 having a control chamber 12 where the cam ring 21 is movably arranged to move the cam ring 21 using an oil pressure; a spool valve A for controlling the cam ring 21; a solenoid valve 81; and a relief valve 83. Each valve housing is provided with a communication hole 7 for supplying oil from the control chamber 12 of the pump chamber 11 to a portion between the control chamber 12 and at least one of the valve housings. A through-hole for discharging the oil is formed in the valve housing.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present invention relates to a variable displacement oil pump provided with a variable displacement mechanism such as a vane pump, capable of suppressing hunting caused by pulsation of a vane pump during a discharge operation with a very simple structure.2. Description of the Related Art[0002]Conventionally, various types of vane pumps capable of changing a discharge amount are known in the art. A representative example is discussed in Japanese Patent Application Publication No. 2015-21400. Japanese Patent Application Publication No. 2015-21400 discloses a variable displacement type pump capable of changing a pump discharge capacity by swinging a cam ring. However, it is known that the vane pump suffers from significant pulsation. In addition, the pulsation becomes significant as the discharge amount increases from zero by starting the pump.SUMMARY OF THE INVENTION[0003]In a variable displacement oil pump such as a vane p...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F04C14/22F01C21/10F01C21/04F01C20/18
CPCF04C2210/206F01C21/04F04C14/223F01C21/106F01C20/18F04C14/12F04C15/0049F04C2/344F16N13/20F16K3/24F16K31/42F16K17/04F04C2/102F04C2240/811F04C2/3442F04C15/0088
InventorOSAKI, RYOSUKESENBONGI, YUJIWATANABE, TAKATOSHIKOBAYASHI, HARUYO
OwnerYAMADA SEISAKUSHO KK