Title:
HYDRAULIC OIL COOLING SYSTEM FOR VEHICULAR AUTOMATIC TRANSMISSION
Document Type and Number:
Japanese Patent JP3168516
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To ensure a necessary flow rate of lubricating oil in the lubricating circuit of a shift mechanism under extremely low temperature even when the prime pressure of a water-cooled and air-cooled oil coolers is boosted.
SOLUTION: This hydraulic oil cooling system comprises a water-cooled oil cooler 12 and an air-cooled oil cooler 14 connected in series, and a bypass valve 21 for circulating hydraulic oil of low temperature between a hydraulic control circuit and a shift mechanism lubricating circuit 15 both of a vehicular automatic transmission so that it bypasses both water-cooled and air-cooled oil coolers 12 and 14. A relief valve 33 is disposed to cause hydraulic oil to flow from the water-cooled oil cooler 12 direct into the lubricating circuit 15, not through the air-cooled oil cooler 14, when the hydraulic oil pressure of an oil passage 13 between the water-cooled and air-cooled oil coolers 12 and 14 increases.
Inventors:
Yasutaka Kawamura
Application Number:
JP21266198A
Publication Date:
May 21, 2001
Filing Date:
July 28, 1998
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F16H57/04; (IPC1-7): F16H57/04
Domestic Patent References:
| JP492147A | ||||
| JP814368A | ||||
| JP646558A | ||||
| JP6067498U | ||||
| JP62185963U | ||||
| JP1132850U | ||||
| JP6359257U | ||||
| JP322163U | ||||
| JP259349U | ||||
| JP198365U | ||||
| JP6375654U |
Attorney, Agent or Firm:
Akihide Sugimura (6 others)