Shifting unit

A technology of pressure and control chambers, applied in the direction of components with teeth, servo motors, transportation and packaging, etc., can solve the problems of the limitations of the dynamic characteristics of the control cylinder, the limitation of system availability, etc., and achieve the effect of improving the dynamic characteristics

Inactive Publication Date: 2007-02-21
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If only one of the valves mentioned fails, the function of this valve for the corresponding cylinder chamber can no longer be changed, whereby the availability of the entire system is limited and in some cases no longer usable
In addition, the dynamic characteristics of the control cylinder have great limitations

Method used

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  • Shifting unit

Examples

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Embodiment Construction

[0013] The shifting unit 1 has control cylinders 2 , 4 , 6 and 8 which can be accommodated in a common housing, not shown. Control cylinder 2 has control chambers 10 and 12 , control cylinder 4 has control chambers 14 and 16 , control cylinder 6 has control chambers 18 and 20 and control cylinder 8 has control chambers 22 and 24 . The control chamber 10 of the control cylinder 2 is connected to an opening valve 26 and a closing valve 28 . The control chamber 12 of the control cylinder 2 is connected to an opening valve 30 and a closing valve 32 . The control chamber 14 of the control cylinder 4 is connected to an opening valve 34 and a closing valve 36 . The control chamber 16 of the control cylinder 4 is connected to an opening valve 38 and a closing valve 40 . The control chamber 18 of the control cylinder 6 is connected to an opening valve 42 and a closing valve 44 . The control chamber 20 of the control cylinder 6 is connected to an opening valve 46 and a closing valve ...

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Abstract

The invention concerns a shifting unit (1) for a motor vehicle gearbox, said switching unit comprising valves, which are connected between them by a pressure supply conduit (58) and by a pressure discharge conduit (60), associated with a distribution chamber (10) of a distribution cylinder (2). The distribution chamber (10) of the distribution cylinder (2) comprises at least one opening valve (26) and at least one closure valve (28). The invention is characterized in that additional valves (62, 64, 66, 68) enable the pressure supply conduit (58) and the pressure discharge conduit (60) to be controlled independently for closing, opening, blocking and / or exchanging.

Description

technical field [0001] The invention relates to a shifting unit of the type defined in the preamble of claim 1 . Background technique [0002] Modern transmissions, mainly in commercial vehicles, are more and more often electronically controlled, the actuating forces being generated pneumatically or hydraulically, which improve the shifting speed and smoothness of the shifting. The transmissions of large commercial vehicles are often divided into a main transmission, a split auxiliary transmission and a range auxiliary transmission. They have a shifting unit, for example supported by a pneumatic system, which carries out the pneumatic shifting in the splitter and range splitters, while the shifting in the main transmission can be carried out by means of the synchronizer when entering the gears. The transmission brake (Getriebebremse) is supported by the pneumatic system by means of the engine in the exerted force when the gear is reversed. [0003] Such a shifting unit for...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): F16H61/28F15B11/00F15B20/00F15B11/16F16H61/12
CPCF15B11/16F16H61/2807F15B2211/3111F15B2211/30575F15B2211/71F15B2211/31588F15B20/008F15B2211/8636F15B11/006F16H61/12Y10T137/87217
InventorM·施泰因博恩R·佩措尔德M·米勒
OwnerZF FRIEDRICHSHAFEN AG