Seal device for hydraulic circuit

Patent metadata

Field	Value
Publication number	US-9719486-B2
Application number	US-201114240540-A
Country	US
Kind code	B2
Filing date	Aug 30, 2011
Priority date	Aug 30, 2011
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

In a seal device for a hydraulic circuit, in which an oil passage that supplies hydraulic oil to or discharges the hydraulic oil from a hydraulic actuator operated by hydraulic pressure is formed over at least two members that relatively move, and a seal member that seals a gap between the two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least either one of the two members, a communication section that allows the groove section to communicate with any portion of the oil passage such that the hydraulic oil in the interior of the groove section moves along with supply of the hydraulic oil to or discharge of the hydraulic oil from the hydraulic actuator is formed.

First claim

The invention claimed is:

1. A device for a hydraulic circuit comprising:
a supply passage configured to supply hydraulic oil to a hydraulic actuator operated by hydraulic pressure, and formed over at least two members that relatively move;
a discharge passage configured to discharge the hydraulic oil from the hydraulic actuator, and formed over the at least two members;
a seal member that seals a gap between the at least two members in a liquid-tight manner is disposed in an interior of a groove that is formed in at least one of the at least two members;
a supply communication section that allows the groove section to communicate with the supply passage at a position midstream of the supply passage; and
a discharge communication section that allows the groove section to communicate with the discharge passage at a position midstream of the discharge passage,
wherein the seal member continuously seals the gap,
wherein the hydraulic actuator includes: a cylinder section that is formed with an inner cylinder section, an outer cylinder section, and a side wall section, the side wall section connecting the inner cylinder section and the outer cylinder section; and a piston that is housed in an interior of the cylinder section to reciprocally move in a liquid-tight manner,
the inner cylinder section is fitted on a hollow shaft section in which the hydraulic oil flows through a hollow section on an inner peripheral side of the inner cylinder section,
the supply passage and the discharge passages are formed to pass through the hollow shaft section and the inner cylinder section in a racial direction, and
the groove section is formed on the supply passage and the discharge passage in an outer peripheral section of the hollow shaft section.

2. The device for a hydraulic circuit according to claim 1 , wherein the supply communication section and the discharge communication section each include a through hole that allows communication between the groove section and the hollow section.

3. The device for a hydraulic circuit according to claim 1 , wherein the supply communication section and the discharge communication section each include a notch in which the side wall section that defines the groove section is notched to allow communication between the groove section and each of the supply passage and the discharge passage.

4. A device for a hydraulic circuit comprising:
a supply passage configured to supply hydraulic oil to a hydraulic actuator operated by hydraulic pressure, and formed over at least two members that relatively move;
a discharge passage configured to discharge the hydraulic oil from the hydraulic actuator, and formed over the at least two members;
a seal member that seals a gap between the at least two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least one of the at least two members;
a supply communication section that allows the groove section to communicate with the supply passage at a position midstream of the supply passage; and
a discharge communication section that allows the groove section to communicate with the discharge passage at a position midstream of the discharge passage,
wherein the seal member continuously seals the gap,
wherein the at least two members includes a shaft member and a rotating member that is fitted on an outer peripheral side of the shaft member and has the hydraulic actuator,
the supply passage is formed to pass through an interior of the shaft member, to include an opening that opens on an outer peripheral surface of the shaft member, and further to pass through a section of the rotating member so as to allow communication between the opening of the supply passage and the hydraulic actuator,
the discharge passage is formed to pass through the interior of the shaft member, to include an opening that opens in a position offset from the opening of the supply passage in a circumferential direction, and to pass through a section of the rotating member so as to allow communication between the opening of the discharge passage and the hydraulic actuator, and
the seal member is disposed between the shaft member and the rotating member.

5. The device for a hydraulic circuit according to claim 4 ,
wherein the supply passage and the discharge passage are formed in symmetrical positions about a center of the shaft member in an outer peripheral section of the shaft member, and
the supply communication section is formed to adjoin the supply passage, and the discharge communication section is formed to adjoin the discharge passage.

6. The device for a hydraulic circuit according to claim 4 , wherein the rotating member includes a clutch drum that houses, in an interior thereof, a piston that moves in an axial direction by hydraulic pressure.

7. A device for a hydraulic circuit comprising:
a supply passage configured to supply hydraulic oil to a hydraulic actuator operated by hydraulic pressure, and formed over at least two members that relatively move;
a discharge passage configured to discharge the hydraulic oil from the hydraulic actuator, and formed over the at least two members;
a seal member that seals a gap between the at least two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least one of the at least two members;
a supply communication section that allows the groove section to communicate with the supply passage at a position midstream of the supply passage;
a discharge communication section that allows the groove section to communicate with the discharge passage at a position midstream of the discharge passage;
a pressure increase valve that selectively allows communication between the supply passage and a hydraulic pressure source; and
a pressure reduction valve that selectively allows communication between the discharge passage and a prescribed chain portion,
wherein the seal member continuously seals the gap, and
wherein the device is configured such that when an estimation that a temperature of the hydraulic oil contacting the seal member increases to a prescribed value or higher is made, at least either one of the pressure increase valve and the pressure reduction valve is opened, and flow of the hydraulic oil is caused in the supply passage, discharge passage, and the groove section that communicates via the supply communication section and the discharge communication section.

Assignees

• Kimura Kenta
• Hattori Yuji
• Inagawa Tomokazu
• Inagaki Takafumi
• Nagasato Yu
• Toyota Motor Co Ltd

Inventors

• Kimura Kenta
• Hattori Yuji
• Inagawa Tomokazu
• Inagaki Takafumi
• Nagasato Yu

Classifications

• F16D25/0638

  with more than two discs, e.g. multiple lamellae · CPC title

• F16D25/12 Primary

  Details not specific to one of the before-mentioned types · CPC title

• F16D2300/08

  Details or arrangements of sealings not provided for in group F16D3/84 · CPC title

• F16J15/16

  between relatively-moving surfaces (F16J15/50, F16J15/52 take precedence; bellows pistons F16J3/06; piston-rings or ring sealings of similar construction F16J9/00) · CPC title

• F16D2300/0214

  Oil or fluid cooling · CPC title