Oil pump and power transmitting device equipped with the same

Patent metadata

Field	Value
Publication number	US-2016003245-A1
Application number	US-201414767830-A
Country	US
Kind code	A1
Filing date	Mar 17, 2014
Priority date	Mar 29, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A driven sprocket of a chain driving mechanism is fixed to a rotation shaft between a front pump cover and a converter housing, and the rotation shaft is supported by a first supporting hole of the front pump cover and a second supporting hole of a rear pump cover. The movement of the driven sprocket in such a direction that it approaches the converter housing is restricted by a case side projection formed on the converter housing, and the movement of the driven sprocket in such a direction that it separates from the converter housing is restricted by a cover side projection formed on a bottom surface of the second supporting hole.

First claim

1 . An oil pump including an external gear that rotates together with an rotation shaft, an internal gear that meshes with the external gear, and a pump housing including a gear accommodating chamber that accommodates the external gear and the internal gear, the oil pump being disposed in a case that accommodates a transmission coupled to a motor, the oil pump comprising:
a chain driving mechanism including a drive sprocket rotatably driven by power from the motor, a driven sprocket attached to the rotation shaft, and a chain wound around the drive sprocket and the driven sprocket, wherein the pump housing includes a supporting hole that faces a part of the case and that supports the rotation shaft so as to be rotatable; the driven sprocket is fixed to the rotation shaft between the pump housing and the part of the case; and movement of the driven sprocket in such a direction that the driven sprocket approaches the case is restricted by a case side projection formed on the part of the case, and movement of the driven sprocket in such a direction that the driven sprocket separates from the case is restricted by a part of the pump housing.

2 . The oil pump according to claim 1 , wherein
the pump housing includes a pump body including the gear accommodating chamber, and a pump cover; the pump cover includes a first cover that is formed to face the part of the case and that covers one end of the pump body, and a second cover that covers the other end of the pump body; the supporting hole includes a first supporting hole that passes through the first cover and a bottomed second supporting hole formed in the second cover; the case side projection is formed on the part of the case to contact one end of the rotation shaft; and a cover side projection that contacts the other end of the rotation shaft is formed on a bottom surface of the second supporting hole.

3 . The oil pump according to claim 2 , wherein
the rotation shaft includes a large diameter portion supported by the first supporting hole so as to be rotatable, a small diameter portion supported by the second supporting hole so as to be rotatable, and a coupling portion formed between the large diameter portion and the small diameter portion and coupled to a coupling hole formed in the external gear; the small diameter portion is formed so as to be inserted into the coupling hole of the external gear; and the coupling portion is formed so as to be inserted into the first supporting hole.

4 . The oil pump according to claim 3 +, wherein
the case includes a first case to which the oil pump is coupled, and a second case formed to face the oil pump and coupled to the first case, the case side projection is formed on the second case.

5 . A power transmitting device comprising the oil pump according to claim 4 , the transmission, a hydraulic oil accumulating portion that accumulates a hydraulic oil, a strainer disposed between the hydraulic oil accumulating portion and the oil pump to filter the hydraulic oil suctioned by the oil pump from the hydraulic oil accumulating portion, and a hydraulic control device that regulates a pressure of the hydraulic oil discharged from the oil pump and supplies the hydraulic oil to a hydraulic equipment included in the transmission, wherein
the strainer is disposed beside the oil pump; and the hydraulic control device is attached to a side part of the case so as to be located on an opposite side of the oil pump from the strainer.

6 . The oil pump according to claim 1 , wherein the case includes a first case to which the oil pump is coupled, and a second case formed to face the oil pump and coupled to the first case, the case side projection is formed on the second case.

7 . A power transmitting device comprising the oil pump according to claim 1 , the transmission, a hydraulic oil accumulating portion that accumulates a hydraulic oil, a strainer disposed between the hydraulic oil accumulating portion and the oil pump to filter the hydraulic oil suctioned by the oil pump from the hydraulic oil accumulating portion, and a hydraulic control device that regulates a pressure of the hydraulic oil discharged from the oil pump and supplies the hydraulic oil to a hydraulic equipment included in the transmission, wherein
the strainer is disposed beside the oil pump; and the hydraulic control device is attached to a side part of the case so as to be located on an opposite side of the oil pump from the strainer.

Assignees

• Aisin Aw Co

Inventors

• Ike Nobukazu
• Seki Yuichi
• Takahashi Yusuke

Classifications

• F04C2/10

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title

• F04C15/0061 Primary

  Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions · CPC title

• F04C15/008

  Prime movers · CPC title

• F16H2200/2097

  comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing · CPC title

• F16H55/30

  Chain-wheels · CPC title