# US 2009/0260353 A1 · Hydraulic power output unit and hydraulic hybrid drive system including same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260353 A1 - Document ID: US20090260353A1 - Status: Published application - Kind: A1 - Application number: 12/348,089 - Filed: 2009-01-02 - Published: 2009-10-22 - Earliest claimed: 2008-01-02 - Assignees: Parker-Hannifin Corporation - Inventors: John M. Loeffler; James A. Blalock - Web page: https://patentgrep.com/patent/US20090260353A1 ## CPC - F16H 47/02: the fluid gearing being of the volumetric type - B60K 6/12: by means of a chargeable fluidic accumulator - Y02T 10/62: Hybrid vehicles - Y10T 74/19149: with fluid drive - Y10T 74/2131: Damping by absorbing vibration force [via rubber, elastomeric material, etc.] - F16H: GEARING - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A hydraulic power output unit can be used in a hydraulic hybrid drive system for propelling a vehicle. The hydraulic power output unit includes a housing having an input shaft that extends within the housing and is adapted to be rotatably driven by a source of rotational power. A hydraulic pump is rotatably driven by the input driveshaft to pump hydraulic fluid. A vibration damper is provided within the housing for dampening vibrations in the input shaft. ## Claims ### Claim 1 A hydraulic power output unit comprising: a housing; an input shaft that extends within the housing and is adapted to be rotatably driven by a source of rotational power; a hydraulic pump that is rotatably driven by the input driveshaft to pump hydraulic fluid; and a vibration damper provided within the housing for dampening vibrations in the input shaft. ### Claim 2 (depends on 1) The hydraulic power output unit defined in claim 1 wherein the vibration damper is supported on the input shaft for rotation therewith. ### Claim 3 (depends on 2) The hydraulic power output unit defined in claim 2 wherein the vibration damper is splined onto the input shaft. ### Claim 4 (depends on 1) The hydraulic power output unit defined in claim 1 further including a drive gear that is supported on the input shaft for rotation therewith and a driven gear that is rotatably driven by the drive gear and is supported on a driveshaft for rotation therewith so as to rotatably drive the hydraulic pump. ### Claim 5 (depends on 1) The hydraulic power output unit defined in claim 1 wherein the hydraulic pump is a first hydraulic pump and further including a second hydraulic pump that is rotatably driven by the input driveshaft to pump hydraulic fluid. ### Claim 6 (depends on 5) The hydraulic power output unit defined in claim 5 further including a drive gear that is supported on the input shaft for rotation therewith, a first driven gear that is rotatably driven by the drive gear and is supported on a first driveshaft for rotation therewith so as to rotatably drive the first hydraulic pump, and a second driven gear that is rotatably driven by the drive gear and is supported on a second driveshaft for rotation therewith so as to rotatably drive the second hydraulic pump. ### Claim 7 A hydraulic power output unit and drive unit assembly comprising: a hydraulic power output unit including a housing; an input shaft that extends within the housing and is adapted to be rotatably driven by a source of rotational power; a hydraulic pump that is rotatably driven by the input driveshaft to pump hydraulic fluid; and a vibration damper provided within the housing for dampening vibrations in the input shaft; and a drive unit including an input shaft, a hydraulic motor that is rotatably driven by the hydraulic pump of the hydraulic power output unit and rotatably drives the input shaft, and an output shaft that is rotatably driven by the input shaft. ### Claim 8 (depends on 7) The hydraulic power output unit and drive unit assembly defined in claim 7 wherein the vibration damper is supported on the input shaft of the hydraulic power output unit for rotation therewith. ### Claim 9 (depends on 8) The hydraulic power output unit and drive unit assembly defined in claim 8 wherein the vibration damper is splined onto the input shaft of the hydraulic power output unit. ### Claim 10 (depends on 7) The hydraulic power output unit and drive unit assembly defined in claim 7 wherein the hydraulic power output unit further includes a drive gear that is supported on the input shaft for rotation therewith and a driven gear that is rotatably driven by the drive gear and is supported on a driveshaft for rotation therewith so as to rotatably drive the hydraulic pump. ### Claim 11 (depends on 7) The hydraulic power output unit and drive unit assembly defined in claim 7 wherein the hydraulic pump is a first hydraulic pump and wherein the hydraulic power output unit further includes a second hydraulic pump that is rotatably driven by the input driveshaft to pump hydraulic fluid. ### Claim 12 (depends on 11) The hydraulic power output unit and drive unit assembly defined in claim 11 further including a drive gear that is supported on the input shaft for rotation therewith, a first driven gear that is rotatably driven by the drive gear and is supported on a first driveshaft for rotation therewith so as to rotatably drive the first hydraulic pump, and a second driven gear that is rotatably driven by the drive gear and is supported on a second driveshaft for rotation therewith so as to rotatably drive the second hydraulic pump. ### Claim 13 (depends on 7) The hydraulic power output unit and drive unit assembly defined in claim 7 wherein input shaft to the drive unit is a first input shaft, and wherein the drive unit further includes a second input shaft, the output shaft being selectively rotatably driven by either the first input or the second shaft. ### Claim 14 (depends on 13) The hydraulic power output unit and drive unit assembly defined in claim 13 wherein the hydraulic power output unit further includes a drive gear that is supported on the input shaft for rotation therewith, a first driven gear that is rotatably driven by the drive gear and is supported on a first driveshaft for rotation therewith so as to rotatably drive the first hydraulic pump, and a second driven gear that is rotatably driven by the drive gear and is supported on a second driveshaft for rotation therewith, the second driveshaft of the hydraulic power output unit rotatably driving the second input shaft of the drive unit.