Summary
This invention is a variable displacement hydraulic pump/motor for hybrid automotive applications that has been engineered to overcome the limitations in peak efficiency exhibited by previous pump/motor designs.
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Full Description
| Patent Information: USPTO Site Listing | |||
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| Patent Title: | High-Efficiency, Large Angle, Variable Displacement Hydraulic Pump/Motor | ||
| Patent Number: | 7014429 | ||
| Issue Date: | 3/21/2006 | ||
| Lab Name: | National Vehicle and Fuel Emissions Laboratory | ||
| Location: | Ann Arbor, MI | ||
| Contact: | WVHTC Foundation |
| Technical Description: |
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| This invention is a variable displacement hydraulic pump/motor for hybrid automotive applications that has been engineered to overcome the limitations in peak efficiency exhibited by previous pump/motor designs. The key design feature of the invention is a larger displacement angle that provides several advantages for mechanical and hydraulic efficiency. The larger displacement angle provides a longer stroke for each piston, which allows a reduced piston diameter, reduced barrel diameter, reduced bearings size, lower piston forces and lower ball-to-socket forces. Together, these features result in reduced friction and reduced cost, resulting in high efficiency over a wider range of displacement and speeds. In addition to the aforementioned advantages, the hydraulic pump/motor would have a lower weight, smaller volume and reduced manufacturing costs compared to previous pump/motor designs. |
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| Industry Significance: |
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| This patent is part of a bundle of EPA patents on hydraulic hybrid vehicles, and would represent a component of a hydraulic hybrid power train. The hybrid vehicle market is seeing significant growth, with new models coming out each year. Hydraulic hybrid technology has great potential to carve out a niche in the hybrid vehicle market as benefits in fuel economy are particularly significant for vehicles, such as urban delivery trucks, that are often operated under city driving conditions. | |||
| Potential Applications: |
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| The invention could be incorporated as the pump/motor component of a hydraulic hybrid power system. An example of such a hybrid power system is described in EPA patent U.S. 5,495,912, which discloses a drive train in which an internal combustion engine provides prime power to a hybrid vehicle, while a subsystem consisting of variable displacement hydraulic pump/motors serves to store and release engine power from a hydraulic accumulator. The technology can be utilized with that specifically described in U.S. 5,495,912, or can be implemented with any hydraulic hybrid power system. | |||
| Partnership Opportunities: |
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The lower cost of hydraulic hybrid technology in comparison to gasoline-electric hybrid technology has motivated companies to explore its development. Several, including Ford Motor Company and Eaton Corporation, are developing hydraulic hybrid vehicles with the EPA through cooperative research. For more information, click here: http://www.epatechmatch.com/EPA/PATENT/BROWSEFEATURED.ASPX#
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