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Oil pump

a variable capacity, oil pump technology, applied in the direction of liquid fuel engines, machines/engines, rotary/oscillating piston pump components, etc., can solve the problems of slow adjustment of the adjustment ring, reduced response of the control on the pump capacity, etc., to speed up the operation, reduce the flow resistance of the oil going back and forth between two spaces, and reduce the resistance

Inactive Publication Date: 2015-12-10
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a solution to improve the response of control in a variable-capacity oil pump. This is achieved by narrowing the gap between the guide surface of the guide pin and the guided surface of the guide slot, which causes an increase in flow resistance of the oil and slows down the displacement of the adjustment ring, especially when the oil viscosity is high. This results in a decrease in the control response on the pump capacity. The present invention addresses this issue to enhance the pump's control performance.

Problems solved by technology

Particularly, when a viscosity of the oil is high like a case where a temperature is low, the resistance increases, so that the displacement of the adjustment ring becomes slow.
Therefore, in this case, response of a control on a pump capacity may decrease.

Method used

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  • Oil pump
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Examples

Experimental program
Comparison scheme
Effect test

second example

[0069]FIGS. 4A, 4B illustrate a second example in which a pair of grooves 71, 71 is formed on an outer periphery of an axially intermediate part (partially) of a guide pin 7 at a generally semicircular interval, so that the intermediate part is provided as a small sectional area part having a sectional area smaller than that of the other part. The pair of grooves 71, 71 may be also formed integrally in a manufacturing process of the guide pin 7, or may be machined. Further, it is preferable that a sectional area of each of the grooves 71 be set to be larger than a sectional area of a gap between a guide surface on an outer periphery of the guide pin 7 and a guided surface on an inner periphery of a guide slot 54.

[0070]The guide pin 7 thus provided with the grooves 71 is attached to a housing 10 so that orientations in which the grooves 71 extend are along a longitudinal direction of the guide slot 54, 55. Hereby, the grooves 71 each serve as a communicating passage that communicates...

third example

[0072]FIGS. 5A, 5B illustrate a third example in which a tip end side (an upper side in FIG. 5B) of a guide pin 7 is provided as a small sectional area part and as a tapered part 7b (a sectional-area gradually changing part), so that a space 72 around the tapered part 7b serves as a communicating passage. The tapered part 7b may be also formed integrally in a manufacturing process of the guide pin 7 or may be machined. Alternatively, the guide pin 7 itself may be formed integrally with a bottom of a receptacle recessed portion 12 of a housing 10 at the time of casting the housing 10. In this case, since the tip end side of the guide pin 7 is the tapered part 7b, demolding is performed easily.

[0073]In this example, similarly to the first example, the space 72 (a reference sign is shown only in FIG. 5B) around the tapered part 7b (the small sectional area part) of the guide pin 7 serves as the communicating passage, so that oil flows therethrough, which makes it possible to reduce a f...

fourth example

[0075]FIGS. 6A, 6B illustrate a fourth example in which a communicating passage (a through hole 73) is provided so as to penetrate through a guide pin 7. The through hole 73 may be also formed integrally in a manufacturing process of the guide pin 7 or may be machined. Even in this example, oil flows through the communicating passage (the through hole 73), so that a flow resistance thereof can be reduced.

[0076]In the fourth example, a whole outer peripheral surface of the guide pin 7 serves as a guide surface and makes sliding contact with an inner peripheral surface (a guided surface) of a guide slot 54, so that a guiding function is easy to be secured. However, similarly to the second example, it is necessary for the guide pin 7 to be attached to a housing 10 so that an orientation in which the through hole 73 extends is along a longitudinal direction of the guide slot 54, 55. Note that it is preferable that a sectional area of the through hole 73 be set to be larger than a sectio...

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Abstract

A guide slot having an elongated-hole shape is formed in a capacity adjustment member, so that displacement of the capacity adjustment member is regulated, by a guide pin inserted into the guide slot, to a longitudinal direction of the guide slot. Two spaces separated by the guide pin into one side and the other side in the longitudinal direction of the guide slot are formed inside the guide slot, and a communicating passage is provided so as to communicate the spaces with each other.

Description

INCORPORATION BY REFERENCE[0001]The disclosure of Japanese Patent Application No. 2014-119363 filed on Jun. 10, 2014 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a variable-capacity oil pump.[0004]2. Description of Related Art[0005]Japanese Patent Application Publication No. 2013-100737 (JP 2013-100737 A) describes an oil pump constituted by an internal gear pump configured to discharge, from a discharge port, oil taken in from an inlet port by rotation of an inner rotor (a drive rotor) and an outer rotor (a driven rotor) meshing with each other.[0006]The oil pump includes an adjustment ring (a capacity adjustment member) so as to rotatably hold the outer rotor from its outer periphery in a housing. The adjustment ring is displaced by receiving a hydraulic pressure introduced into a pressurizing space in the housing. Hereby, relat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C14/18F04C13/00F04C15/06F04C2/14F04C15/00
CPCF04C14/18F04C2/14F04C13/002F04C15/06F04C15/0057F04C2/102F04C14/226F04C2240/80
Inventor TAKAHASHI, KATSUAKIYOKOTA, KAZUHIROMURAKAMI, NOBUYUKIKITTAKA, TOMOYUKIONO, HISASHINISHIDA, YUKI
Owner TOYOTA JIDOSHA KK
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