Seven-gear planetary automatic transmission

A technology of automatic transmission and planetary gear, which is applied to vehicle gearboxes, transmission components, transmission devices, etc., can solve problems such as unstable work, inability to adjust low-speed conditions, and large speed ratios, so as to reduce volume and weight, Realize the effect of light weight and uniform transmission ratio

Inactive Publication Date: 2017-03-22
贵州凯星液力传动机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the seven-speed planetary automatic transmission for mainstream road vehicles has a relatively large speed ratio between the first gear and the second gear, which is reflected in the output speed. The fluctuation of the output speed is relatively large. During the running process, it is easy to produce shifting shock, unstable work, etc., that is, there will be a great shifting frustration when shifting from the first gear to the second gear or from the second gear to the first gear, which seriously affects the comfort and fuel economy. sex
For example, the speed ratios of the five gears of the planetary gear transmission mechanism of the HT750DRD hydraulic transmission produced by the U.S. ALLISON company are i1=7.97, i2=3.19, i3=2.07, i4=1.4, i5=1, and one of the speed ratios is the same as The speed ratio of the second gear has a large difference, which is not conducive to the operation of some working machines that need to switch between high and low speeds frequently

Method used

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Embodiment

[0026] Embodiment: The planetary automatic transmission of this scheme is suitable for road vehicles. Among them, the planetary rows are arranged in order, and the transmission components are used to connect each planetary row. The input shaft is connected to the input member 1, which is generally the turbine shaft of the hydraulic torque converter, and is used to transmit the power of the engine through the hydraulic torque converter. to the transmission. The output shaft is connected with the output member 2, and the power is transmitted to the front and rear axles or the left and right drive wheels through the transfer case or differential. The transmission is completely symmetrical with respect to the center of rotation, figure 1 The lower part of the center of rotation is omitted in , and will not be explained in the following description.

[0027] The first planetary row P1 includes three rotating parts: the first sun gear T1, the first ring gear Q1 and the first plane...

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Abstract

The invention discloses a seven-gear planetary automatic transmission. The seven-gear planetary automatic transmission comprises an input component, an output component, five transmission components, four brakes, two clutches and four planetary gear trains. The automatic transmission adopts the scheme with the four planetary gear trains, the four brakes and the two clutches and is provided with seven forward gears and two reversing gears. The structure is simple and compact, and the space occupied by the transmission is reduced; and the transmission ratio range is wide, the clearance ratio is low, and power of an engine is fully and advantageously utilized under different working conditions.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission, in particular to a seven-speed planetary automatic transmission. Background technique [0002] The transmission system is one of the basic components of the vehicle. It is used to transmit the engine power, and can change the speed and traction of the vehicle as required when driving in a straight line. The transmission system also realizes the reversing and parking of the vehicle. The transmission is a very important part of the transmission system. At present, the seven-speed planetary automatic transmission for mainstream road vehicles has a relatively large speed ratio between the first gear and the second gear, which is reflected in the output speed. The fluctuation of the output speed is relatively large. During the running process, it is easy to produce shifting shock, unstable work, etc., that is, there will be a great shifting frustration when shifting from the first gea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/66
CPCF16H3/66F16H2200/0056F16H2200/2012F16H2200/2046F16H2200/0086
Inventor 杨娟罗静李世鹏秦龚玉
Owner 贵州凯星液力传动机械有限公司
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