Pump apparatus

Inactive Publication Date: 2016-06-23
HITACHI AUTOMOTIVE SYST STEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to improve the accuracy of position control of a spool valve in a pump apparatus to stabilize the pump discharge amount. The technical effect of this invention is to address the problem of inconsistent pump discharge amount and to ensure consistent performance.

Problems solved by technology

Consequently, the eccentric amount of the cam ring which is controlled based on the disposition of the spool valve becomes unstable, so that there is generated the variation of the pump discharge amount.

Method used

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Experimental program
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Effect test

first embodiment

[0023]This embodiment shows the pump apparatus according to the present invention which is applied to a variable displacement vane pump 1.

[0024]As shown in FIG. 1 to FIG. 4, this variable displacement vane pump 1 includes a pump housing 2 including a pump element receiving chamber 2a which is formed within the pump housing 2, and which is a pump element receiving portion that has a cylindrical shape; and a pump element 3 received in the pump element receiving chamber 2a. The variable displacement vane pump 1 performs a pump operation by rotatably driving the pump element 3 by a drive shaft 4 inserted through the pump element receiving chamber 2a.

[0025]As shown in FIG. 2, the pump housing 2 includes a housing main body 5 which has a bottomed cylindrical shape; and a housing cover 6 which closes an opening portion of the housing main body 5. The housing main body 5 and the housing cover 6 are tightened and fixed together by a plurality of bolts 7.

[0026]As shown in FIG. 1 and FIG. 2, ...

second embodiment

[0078]FIG. 5 shows a second embodiment according to the present invention. In the second embodiment, a basic structure is identical to that of the first embodiment. Upstream ends of the first and second cam control pressure introduction passages 55 and 56 are connected, respectively, to the downstream side of the metering orifice 34. With this, the downstream pressure of the metering orifice 34 is introduced, respectively, into the third and fifth pressure chambers 49 and 51.

[0079]In this embodiment, the eccentric amount control of the cam ring 9 does not affect the position control of the spool valve 39, like the first embodiment. Accordingly, it is possible to stabilize the pump discharge amount. However, the hydraulic oil passing through the metering orifice 34 is used for the eccentric amount control of the cam ring 9. Consequently, the oil amount of the hydraulic oil supplied to the CVT becomes smaller than the oil amount passing through the metering orifice 34.

[0080]However, t...

third embodiment

[0082]FIG. 6 shows a third embodiment according to the present invention. The third embodiment has a basic structure identical to that of the first embodiment. The upstream end of the second cam control pressure introduction passage 56 is connected to the downstream side of the metering orifice 34. With this, the upstream pressure of the metering orifice 34 is introduced into the third pressure chamber 49. On the other hand, the downstream pressure of the metering orifice 34 is introduced into the fifth pressure chamber 51.

[0083]Accordingly, in this embodiment, the upstream pressure of the metering orifice 34 is introduced, respectively, to the first and third pressure chambers 47 and 49. Consequently, the fluid pressures within the first and third pressure chambers 47 and 49 become substantially identical to each other. The pressure difference between the first and third pressure chambers 47 and 49 becomes small. On the other hand, the downstream pressure of the metering orifice 34...

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Abstract

A pump apparatus includes: a spool valve including a first land portion, a second land portion, and a third land portion; a first pressure chamber into which an upstream pressure of the metering orifice is introduce; a second pressure chamber into which a downstream pressure of the metering orifice is introduced; a third pressure chamber into which the pressure of the discharge passage is introduced; a fourth pressure chamber into which a low pressure is introduced; and a first fluid pressure chamber side communication passage which is formed in the pump housing which is arranged to selectively supply the pressure of the third pressure chamber and the pressure of the fourth pressure chamber to the first fluid pressure chamber in accordance with the movement of the spool valve.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to a pump apparatus which is used as a driving source of a continuously variable transmission, a power steering apparatus and so on.[0002]A Japanese Patent Application Publication No. 2012-87777 discloses a pump apparatus including a pump housing including a pump element receiving portion; a pump element which is driven to be rotated, and which is to arranged to suck and discharge a hydraulic fluid; a discharge passage arranged to introduce the hydraulic fluid discharged by the pump element to a supplied portion; a metering orifice provided in the middle of the discharge passage; and a flow rate control valve arranged to control is the discharge amount of the hydraulic fluid by the pump element.[0003]The pump element includes a rotor arranged to be rotated as a unit with the drive shaft; a plurality of vanes which are provided to an outer circumference portion of the rotor to be moved in a radially outward direction and in a ra...

Claims

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Application Information

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IPC IPC(8): F04C14/22F04C15/00F04C2/32
CPCF04C14/223F04C15/008F04C2/32F04C2/352F04C15/064F04C2/3441F04C14/226F04C2240/811F04C2270/205F04C2270/21
InventorKIDO, YOSHIAKI
OwnerHITACHI AUTOMOTIVE SYST STEERING