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Binary pumps for transmissions

A binary pump and transmission technology, applied in the direction of components with teeth, pumps, rotary piston type/oscillating piston type pump combinations, etc., can solve the problems of reducing transmission efficiency, transmission efficiency loss, transmission rotation loss, etc. The effect of improving fuel economy

Active Publication Date: 2017-09-19
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, larger diameter, higher displacement pumps that meet transmission hydraulic demands at near engine idle speeds often cause undesirable transmission spin losses and reduce transmission efficiency
A large pump will provide a much greater oil flow than is consumed by the transmission at higher engine speeds, and the higher pump power consumption results in a loss of overall transmission efficiency

Method used

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  • Binary pumps for transmissions
  • Binary pumps for transmissions
  • Binary pumps for transmissions

Examples

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Embodiment Construction

[0044] The following description is merely exemplary in nature and is not intended to limit the disclosure, its application, or uses.

[0045] Referring now to the accompanying drawings, in Figure 1A and Figure 1B A flexible binary pump system embodying the principles of the present invention is illustrated in and designated at 10 . The flexible binary pump 10 includes a high pressure pump 12 and a low pressure pump 14 , both of which are balanced vane pumps mounted around an axis 16 . In some arrangements, flexible binary pump 10 is an off-axis pump driven by a chain that meshes with a sprocket (not shown) attached to shaft 16 . Further improvements to off-axis pumps are described in U.S. Patent No. 6,964,631 and U.S. Patent Application No. 13 / 475,559, filed May 18, 2012, entitled "Pump Assembly with Multiple Gear Ratios" Details, the entire contents of these two patent documents are incorporated herein by reference. This arrangement utilizes, for example, an electric mo...

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Abstract

The present invention relates to binary pumps for transmissions. A flexible binary pump system for an automotive transmission comprising: a shaft, a first vane pump mounted on the shaft and having a first rotor having a first diameter and a first width, and a first vane pump mounted on the shaft and having A second vane pump with a second rotor of a second diameter and a second width. The first vane pump provides hydraulic fluid to the transmission at a first pressure and the second vane pump provides hydraulic fluid to the transmission at a second pressure. The first diameter, first width, second diameter and second width are selected to optimize power consumption of the binary pump system and hydraulic fluid budget of the transmission.

Description

technical field [0001] The present disclosure relates to a flexible binary pump for an automotive transmission. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art. [0003] Many modern automotive automatic continuously variable transmissions (CVTs) use controlled hydraulic fluid (transmission oil) to actuate the CVT belts and pulleys (or chains and pulleys) to achieve the desired speed ratio in a downsized turbocharged engine Optimize fuel economy. Control of this hydraulic fluid is accomplished through a valve body that includes a plurality of spool valves that direct hydraulic fluid flow through a set of passages to the CVT pulley pistons and other clutch and brake actuators. The valve body is supplied with pressurized hydraulic fluid, typically from a gear or vane pump driven by an engine output shaft or a transmission input shaft. [0004] Because ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/38
CPCF16H61/38F16H61/0031F16H2061/66281F16H61/66272F04C2/3446F04C11/001F16H39/24F16H61/0025
Inventor J.C.舒尔茨D.A.威尔顿P.C.伦德贝里
Owner GM GLOBAL TECH OPERATIONS LLC