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Automatic transmission of a vehicle, comprising a central synchronizing device, and method for operating an automatic transmission

A technology of automatic transmission and synchronous device, applied in the direction of brakes, transmission devices, vehicle components, etc., can solve the problems of impaired driving comfort, high operating cost, and high operating cost

Inactive Publication Date: 2017-12-01
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the currently known parking lock systems are characterized by high structural complexity and require high actuation effort
The actuation effort required for the operation of the parking lock system is particularly high due to the actuators that must be used if there is no mechanical connection between the selector lever actuatable on the driver's side and the transmission
[0005] Furthermore, in the case of a parking lock system that positively locks the transmission output, in particular the parking lock When the stop is disengaged, a perceptible and audible brake release shock (Entlastungsschlag) occurs in the drive train, which impairs driving comfort to an undesired extent

Method used

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  • Automatic transmission of a vehicle, comprising a central synchronizing device, and method for operating an automatic transmission
  • Automatic transmission of a vehicle, comprising a central synchronizing device, and method for operating an automatic transmission
  • Automatic transmission of a vehicle, comprising a central synchronizing device, and method for operating an automatic transmission

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Embodiment Construction

[0047] figure 1 A vehicle drive train 1 is shown with a drive machine 2 , an automatic transmission 3 and an output 4 . On the transmission input side, the drive machine 2 can be coupled via a clutch device 31 to a transmission input shaft 32 in a known manner. Assigned to the transmission input shaft 32 is a central synchronizer 8 , which here includes a shifting element 33 designed as a friction brake. In this case, torque can be transmitted or supported between the transmission input shaft 6 and the transmission housing 11 in the region of the brake 33 . Between the brake 33 and the output 4 , which is connected to the transmission output shaft 30 , there is a transmission range 34 , via which transmission range it is possible to engage and deactivate a form-locking shifting element, for example a dog shifting element. Engage and disengage each of the different gear ratios.

[0048] Depending on the requirements respectively present for operating the vehicle drive train ...

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Abstract

The invention relates to an automatic transmission (3) of a vehicle, comprising a central synchronizing device (8), and to a method for operating an automatic transmission (3). A brake (33) is converted into an operating state via the actuating device paired with the brake at least when an operative connection is provided between a transmission input shaft (32) and a transmission output shaft (30) and in the event of a request to hold the transmission output shaft (30) in a rotationally fixed manner. In the operating state, the transmission input shaft (32), which interacts with the brake, is held by the brake (33) in a rotationally fixed manner, and the brake (33) can be kept in the operating state by the actuating device without a supply of energy.

Description

technical field [0001] The invention relates to a vehicle automatic transmission with a central synchronizing device and a method for operating an automatic transmission of the type specified in the preamble of claim 1 or 14 . Background technique [0002] From DE 10 2008 000 645 A1 a dual clutch transmission in the form of an intermediate shaft with a so-called central synchronizer for a vehicle is known, wherein a braking device is provided for braking each subtransmission, wherein a A band brake is used as the braking device. Furthermore, DE 10 2008 000 637 A1 discloses an actuating device for a centrally synchronized dual clutch transmission. [0003] In automatic transmissions, the parking lock function is usually implemented by a mechanical parking lock, which respectively establishes a mechanical or positive connection between the transmission output and the transmission housing. [0004] However, the currently known parking lock systems are characterized by a high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H63/34
CPCF16H63/345B60T1/062F16H2003/123F16H2061/0411F16H3/12B60T1/005F16D49/08F16H61/04
Inventor 于尔根·瓦夫齐希马蒂亚斯·赖施
Owner ZF FRIEDRICHSHAFEN AG
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