# US 2014/0360290 A1 · Chain drive power take off for hydraulic pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360290 A1 - Document ID: US20140360290A1 - Status: Published application - Kind: A1 - Application number: 13/915,178 - Filed: 2013-06-11 - Published: 2014-12-11 - Earliest claimed: 2013-06-11 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Gregory W. Kempf; Chi Teck Lee; Greg B. Witczak; Trevor Murray - Web page: https://patentgrep.com/patent/US20140360290A1 ## CPC - B60K 17/28: characterised by arrangement, location, or type of power take-off - B60K 2025/022: {by a mechanical transmission} - B60Y 2200/14: Trucks; Load vehicles, Busses - F16H 2057/02026: {Connection of auxiliaries with a gear case; Mounting of auxiliaries on the gearbox} - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - F16H: GEARING ## Abstract A chain drive power take off assembly drives a hydraulic fluid pump from a torque converter input of a motor vehicle. The assembly includes a first, chain drive sprocket which is coupled to and driven by a engine output/torque converter input member such as an engine crankshaft or transmission input member, a chain and a second, driven chain sprocket which is coupled to a stub shaft and which, in turn, is coupled to an input shaft of the hydraulic pump. The driven sprocket resides in a housing secured to the side of the transmission and the pump is secured to the housing with its input shaft and axis of rotation disposed offset from and parallel to the axis of rotation of the transmission and torque converter input member. ## Claims ### Claim 1 A power take off for driving a hydraulic pump from a motor vehicle drive train comprising, in combination, a input member of a automatic transmission torque converter defining a first axis, a chain drive sprocket rotatably coupled to said input member; a stub shaft defining a second axis parallel to and spaced from said first axis; a driven chain sprocket coupled for rotation with said stub shaft; a chain engaged by and extending between said drive and driven chain sprockets; and a hydraulic pump having an input driven by said stub shaft. ### Claim 2 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said input member is supported for rotation in a transmission housing. ### Claim 3 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said input member includes a hub having an opening including a plurality of female splines. ### Claim 4 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said stub shaft is supported on at least one bearing disposed in a housing disposed between a transmission housing and said hydraulic pump. ### Claim 5 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said chain is a single or multiple link chain. ### Claim 6 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said driven chain sprocket is coupled to said stub shaft by interengaging male and female splines. ### Claim 7 (depends on 1) The power take off for a hydraulic pump of claim 1 wherein said multiple link chain is disposed in a plane oriented perpendicularly to said first and said second axes. ### Claim 8 A power take off assembly for driving a hydraulic pump from a transmission input comprising, in combination, a transmission bell housing supporting a rotatable torque converter input member defining a first axis; a chain drive sprocket driven by said input member; an intermediate housing secured to said bell housing; a stub shaft rotatably supported in said intermediate housing and defining a second axis parallel to and spaced from said first axis; a driven chain sprocket rotatably coupled to said stub shaft; a chain engaged by and extending between said drive and driven chain sprockets; and a hydraulic pump supported by said intermediate housing and having an input driven by said stub shaft. ### Claim 9 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 further including an adapting ring disposed between and secured to both said intermediate housing and said hydraulic pump. ### Claim 10 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 wherein said stub shaft is supported on a pair of bearings disposed in said intermediate housing. ### Claim 11 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 wherein said input of said pump is coupled to said stub shaft by interengaging male and female splines. ### Claim 12 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 wherein said driven chain sprocket is coupled to said stub shaft by interengaging male and female splines. ### Claim 13 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 wherein said chain is a single or multiple link chain and is disposed in a plane oriented perpendicularly to said first and said second axes. ### Claim 14 (depends on 8) The power take off assembly for driving a hydraulic pump of claim 8 wherein said hydraulic pump includes inlet and outlet fittings. ### Claim 15 A power take off assembly for driving a hydraulic pump from an input of a motor vehicle transmission comprising, in combination, a transmission housing supporting a rotatable torque converter input member; a chain drive sprocket rotatably coupled to said input member; an intermediate housing secured to said transmission housing; a stub shaft rotatably supported in said intermediate housing; a driven chain sprocket secured to said stub shaft; a chain engaged by and extending between said drive and driven chain sprockets; and a hydraulic pump supported by said intermediate housing and having an input coupled to said stub shaft. ### Claim 16 (depends on 15) The power take off assembly for driving a hydraulic pump of claim 15 wherein said input member includes a hub having a plurality of male splines and said chain drive sprocket includes a plurality of female splines engaged by said male spines on said hub of said input member. ### Claim 17 (depends on 15) The power take off assembly for driving a hydraulic pump of claim 15 wherein said driven chain sprocket is coupled to said stub shaft by interengaging male and female splines. ### Claim 18 (depends on 15) The power take off assembly for driving a hydraulic pump of claim 15 further including a splined socket in said stub shaft and a complementary splined input shaft of said hydraulic pump disposed in said splined socket. ### Claim 19 (depends on 15) The power take off assembly for driving a hydraulic pump of claim 15 said chain is a single or multiple link chain and is disposed in a plane oriented perpendicularly to an axis of said stub shaft. ### Claim 20 (depends on 15) The power take off assembly for driving a hydraulic pump of claim 15 wherein said stub shaft is supported on a pair of bearings disposed in said intermediate housing.