Oil circulating apparatus for automatic transmission

• US 6,520,293 B1
• Filed: 06/14/2000
• Issued: 02/18/2003
• Est. Priority Date: 06/28/1999
• Status: Expired due to Fees

• Current Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Original Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Inventors: Ogawa, Hiroshi, Nakayama, Jun, Murakami, Mamoru
• Primary Examiner(s): KIM, CHONG HWA
• Application Number:
  US09/593,365
• Time in Patent Office: 979 Days
• Field of Search: 184/6.12, 184/6.22, 184/6.24, 184/104.2, 746/06.R, 746/06.A, 475/159, 475/161
• US Class Current: 184/6.22
• CPC Class Codes: F01M 11/02 Arrangements of lubricant conduits
• CPC Class Codes: F01M 2011/0058 Fastening to the transmission
• CPC Class Codes: F01M 2011/0066 with passages in the wall, e.g. for axles or fluid passages
• CPC Class Codes: F01M 2011/007 Oil pickup tube to oil pump, e.g. strainer
• CPC Class Codes: F01M 5/002 Cooling
• CPC Class Codes: F16H 2061/004 Venting trapped air from hydraulic systems
• CPC Class Codes: F16H 57/0404 Lubricant filters
• CPC Class Codes: F16H 57/0434 relating to lubrication supply, e.g. pumps arrangement of pumps F16H57/0441; Pressure control grooves with pumping effect for supplying lubricant F16H57/0428; generation and variation of line pressure for transmission control F16H61/0021
• CPC Class Codes: F16H 57/0456 Lubrication by injection; Injection nozzles or tubes therefor oil mist or spray lubrication F16H57/0458
• CPC Class Codes: F16N 27/005 using restrictions
• CPC Class Codes: Y10T 74/2186 Gear casings

Abstract

A part of oil sucked by an oil pump is circulated to an oil pan through a hydraulic control circuit, an oil cooler and an oil passage provided in a transmission case and the oil pan. The oil guided to the oil pan is gushed out from a discharge port of the oil passage toward a suction port of an oil strainer communicating with the oil pump. The discharge port of the oil passage is disposed opposite and adjacent to the suction port of the oil strainer so that only the oil containing a small number of bubbles is sucked by the oil pump.

Claims

1. An oil circulating apparatus of an automatic transmission having a transmission case, an oil pump, an oil cooler and an oil reservoir connected to said transmission case, for circulating a part of an oil to said oil pump through said oil cooler after said oil is sucked up by said oil pump and supplied to respective parts of said transmission, comprising;

an oil passage provided downstream of said oil cooler;

an oil strainer provided in said oil reservoir and connected with a suction side of said oil pump;

a discharge port of said oil passage provided at a downstream and of said oil passage in the oil reservoir; and

a suction port of said oil strainer provided opposite and adjacent to said discharge port;

wherein a part of said oil passage is formed at an inside of and along an inner surface of said transmission case, and an other part of said oil passage is provided at an inside of and along an inner surface of said oil reservoir and connected with said part of said oil passage formed in said transmission case.

2. An oil circulating apparatus of an automatic transmission having a transmission case, an oil pump, an oil cooler and an oil reservoir connected to said transmission case, for circulating a part of an oil to said oil pump through said oil cooler after said oil is sucked up by said oil pump and supplied to respective parts of said transmission, comprising:

an oil passage provided downstream of said oil cooler;

an oil strainer provided in said oil reservoir and connected with the suction side of said oil pump;

a discharge port of said oil passage provided at a downstream end of said oil passage; and

a suction port of said oil strainer provided opposite and adjacent to said discharge port;

wherein

said oil passage is provided inside of and along the inner surface of said oil reservoir; and

wherein

said oil passage is formed by a U-shaped guide spot-welded to the inner surface of said oil reservoir.

3. An oil circulating apparatus of an automatic transmission having a transmission case, an oil pump, an oil cooler and an oil reservoir connected to said transmission case, for circulating a part of an oil to said oil pump through said oil cooler after said oil is sucked up by said oil pump and supplied to respective parts of said transmission, comprising:

an oil passage provided downstream of said oil cooler;

an oil strainer provided in said oil reservoir and connected with a suction side of said oil pump;

a discharge port of said oil passage provided at a downstream end of said oil passage; and

a suction port of said oil strainer provided opposite and adjacent to said discharge port;

wherein said oil passage is formed by a U-shaped guide spot-welded to an inner surface of said oil reservoir.