Air vent structure of oil pump for automatic transmission, and method for assembling air vent structure
AssigneesJATCO Ltd, Nissan Motor Co., Ltd.
InventorYuuki TANKA
Life of this patent
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Abstract
An automatic transmission has an oil pump driven by a travelling driving source. An air vent structure that expels air bubbles contained in automatic transmission fluid during pump operation has an air vent hole whose one end communicates with an outlet port of the oil pump and whose other end opens toward the oil pan. An air vent tube is connected to an opening end of the air vent hole. The air vent tube is extended up to a strainer lower side gap area located between a strainer and the oil pan, and a tube opening end of the air vent tube is placed in oil of the automatic transmission fluid.
Claims9
An air vent structure of an oil pump for an automatic transmission, which expels air bubbles contained in automatic transmission fluid during pump operation, the oil pump driven by a travelling driving source, sucking the automatic transmission fluid stored in an oil pan from an inlet port through a strainer and supplying pressurized automatic transmission fluid to a control valve unit through an outlet port, the air vent structure comprising:
- an air vent passage whose one end communicates with the outlet port and whose other end opens toward the oil pan, and wherein
- an opening end of the air vent passage is placed in oil of the automatic transmission fluid even when parking on an inclined road.
A method for assembling an air vent structure of an oil pump for an automatic transmission, which expels air bubbles contained in automatic transmission fluid during pump operation, the oil pump driven by a travelling driving source, sucking the automatic transmission fluid stored in an oil pan from an inlet port through a strainer and supplying pressurized automatic transmission fluid to a control valve unit through an outlet port, the air vent structure having an air vent hole communicating with the outlet port, a plate adapter fixed to a case member where the air vent hole is formed and an air vent tube connected to the plate adapter, and a tube opening end of the air vent tube being placed in oil of the automatic transmission fluid at a strainer lower side position, the method comprising:
- a control valve assembly assembling process in which a control valve assembly in which the strainer is secured to the control valve unit is assembled to the case member;
- and
- a plate adapter securing process in which when fixing the air vent tube to the case member through the plate adapter, before the control valve assembly assembling process, the plate adapter is secured to the case member, and wherein
- during the control valve assembly assembling process, the air vent tube is connected to the plate adapter.
Dependencies are inferred from the claim text.