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US 2006/0222552 A1Published application
Torque limited lube pump for power transfer devices
AssigneeMAGNA Powertrain AG & Co KG
InventorsAaron Ronk, Randolph Williams
Life of this patent
Estimating the term…
Abstract
A lube pump is provided for supplying lubricant to various components of a power transmission unit of the type used in motor vehicles. The lube pump includes a pump assembly and a coupling mechanism for releaseably coupling the pump assembly to a driven shaft. The coupling is operable to release the pump assembly when the rotary speed of the shaft exceeds a threshold value.
Claims20
A power transmission unit comprising:
- a casing;
- a shaft rotatably supported by said casing and defining a fluid passage;
- and
- a fluid pump including a pump housing, a pump assembly and a coupling mechanism, said pump housing is fixed to said casing and defines an inlet passage, an outlet passage communicating with said shaft fluid passage and a pump chamber communicating with said inlet and outlet passages, said pump assembly disposed in said pump chamber and has a pump member, and said coupling mechanism releaseably couples said pump member for rotation with said shaft and operable to cause said pump member to rotate relative to said shaft when the rotary speed of said shaft exceeds a predetermined threshold speed value.
1 more element
A power transmission unit comprising:
- a casing;
- a shaft rotatably supported by said casing and defining a shaft passage;
- and
- a fluid pump including a pump housing, a pump assembly and a coupling mechanism, said pump housing is fixed to said casing and defines an inlet passage, an outlet passage communicating with said shaft passage and a pump chamber communicating with said inlet and outlet passages, said pump assembly is disposed in said pump chamber and has a pump member, and said coupling mechanism releaseably couples said pump member for rotation with said shaft and causes said pump member to rotate relative to said shaft when the rotary speed of said shaft exceeds a predetermined threshold speed value, said coupling mechanism includes a drag ring that is fixed to said pump member and which frictionally engages said shaft.
1 more element
A power transmission unit comprising:
- a casing;
- a shaft rotatably supported by said casing and defining a shaft passage;
- and
- a fluid pump including a pump housing, a pump assembly and a coupling mechanism, said pump housing is fixed to said casing and defines an inlet passage, an outlet passage communicating with said shaft passage and a pump chamber communicating with said inlet and outlet passages, said pump assembly is disposed in said pump chamber and has a pump member, and said coupling mechanism releaseably couples said pump member for rotation with said shaft and causes said pump member to rotate relative to said shaft when the rotary speed of said shaft exceeds a predetermined threshold speed value, said coupling mechanism including a coupling ring encircling said shaft and which exerts a compressive force thereon so as to frictionally couple said coupling ring for rotation with said shaft, said coupling ring defining an annular pressure chamber that is in fluid communication with said shaft fluid passage.
1 more element
Dependencies are inferred from the claim text.