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Device for operating parking lock

A technology for parking locks and equipment, applied in mechanical equipment, components with teeth, transmission control and other directions, can solve the problem that the parking lock cannot be connected unintentionally, and achieve the effect of reliable function

Active Publication Date: 2012-09-19
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] From DE 196 25 019 A1 it is known to provide, in addition to the hydraulic control of the parking lock operating device, an electromagnetic locking element which holds the pawl of the parking lock in the open position for hydraulic loading, by This prevents the parking lock from being inadvertently engaged, for example, when the system pressure in the hydraulic transmission control system is interrupted (for example, due to an engine stop).

Method used

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  • Device for operating parking lock
  • Device for operating parking lock

Examples

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Embodiment Construction

[0019] figure 1 "10" denotes the part of an electrohydraulic transmission control device for engaging and disengaging the parking lock of an automatic transmission in a motor vehicle that is of interest within the scope of the present invention.

[0020] The parking lock, not shown, can be of a known construction type, with a locking gear arranged on the output side of the transmission, which is connected to a spring-preloaded, pivotably mounted lock in the transmission housing. A locking pawl interacts, which can be shifted from a disengaged (unlocked) position into an engaged (locked) position via a locking slide valve 12 of a parking lock operating device 14 . The locking slide valve 12 is displaceably guided on the adjusting lever 16 under a preload by a spring 18 in a known manner, so that tooth-to-tooth adjustment between the locking gear and the locking pawl is still possible. A predetermined adjustment travel of the adjustment lever 16 is achieved.

[0021] The adjus...

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PUM

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Abstract

The invention relates to a device for operating a parking lock of an automatic transmission in motor vehicles, with pawl which interacts with a ratchet wheel, which pawl is impinged upon by a spring energy accumulator (24) and for disengaging the parking lock can be hydraulically impinged upon against the preload force of the spring energy accumulator (24) by a hydraulic transmission control with corresponding control valves, wherein the control valves are controllable in accordance with operating parameters of the motor vehicle and a electromagnetically operable locking element (28), which in the controlled state in defined operating conditions additionally holds the pawl in the disengaged position. According to the invention, a purely hydraulically acting self locking valve (40) is integrated in the hydraulic transmission control (10), which locking valve maintains the controlled system pressure when the parking lock operation (14) is pressurized or when the parking lock is disengaged.

Description

technical field [0001] The invention relates to a device for operating a parking lock of an automatic transmission in a motor vehicle according to the preamble of claim 1 . Background technique [0002] With the continuous development of automatic transmissions in motor vehicles, a transmission control device is known, which in shift-by-wire systems is also known as a park lock, so that it can no longer be activated mechanically except when an emergency release is necessary. For example, it is actuated by the selector lever of the transmission control unit. It should be understood that this automatic control of the parking lock must be guaranteed such that in the event of a fault in the control device (e.g. wire break, short circuit, interruption of pressure in the hydraulic system) unintentional opening of the parking lock while the vehicle is parked is as far as possible excluded Or engage the parking lock while the vehicle is in motion. [0003] From DE 196 25 019 A1 it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H63/38
CPCF16H63/48F16H63/3483F16H61/0003
Inventor M·鲍尔W·吉勒斯
Owner AUDI AG
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