Improved eight-gear transmission

An eight-speed transmission and transmission technology, applied in the field of vehicle transmission, can solve the problems of low transmission stability and small speed ratio, and achieve the effects of small modulus, reduced number and light weight

Inactive Publication Date: 2015-10-28
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

The Chinese invention application "eight-speed transmission" (application number: CN201410829472) and the Chinese invention application "CN201410826601-a transmission with a wider range of speed change" (application number: CN201110094929) both disclose a gear train consisting of four planetary gears, six An eight-speed transmission composed of a torque transmission device and four connecting members. The above two transmissions both realize eight forward gear ratios and one reverse gear ratio, but there are problems of small speed ratios and low transmission stability

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, and the content of the present invention is not limited to the following embodiments.

[0028] The eight-speed transmission provided by the present invention has a structure such as figure 1 As shown, it includes a transmission case 3 and an input shaft 1, an output shaft 2, a planetary gear set, a coupling member set and a torque transmission device installed inside the transmission case. The planetary gear set includes the first Planetary gear row, second planetary gear row, third planetary gear row and fourth planetary gear row, each planetary gear row consists of sun gear (14, 24, 34 and 44), planet carrier (13, 23, 33 and 43 ), planetary gears (13, 23, 33 and 43) and ring gears (12, 22, 32 and 42), wherein the planetary gears in the planetary gear row mesh with the sun gear and the ring gear through gear pairs, and the The torque transmission devi...

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Abstract

The invention provides an improved eight-gear transmission which mainly comprises an input shaft, an output shaft, planet gear rows, connecting components and torque transmission devices. The input shaft, the output shaft, the planet gear rows, the connecting components and the torque transmission devices are arranged in a transmission shell. Each planet gear row comprises a sun gear, a planet carrier, a planet wheel and a gear ring. Each torque transmission device comprises two clutches and four brakes, wherein the two clutches and the four brakes are connected selectively so that the sun wheels, the planet carriers, the gear rings and one of the five connecting components can rotate or can be fixed. In addition, at least two torque transmission devices can be connected selectively in a combined mode so that eight forward gear speed ratios and one reverse gear ratio can be established between the input shaft and the output component; the forward gears are five deceleration gears, one direct gear and two overspeed gears. The transmission is compact in structure, low in weight, small in size and easy to arrange on an automobile, and the speed ratio step among the gears of the transmission meets the requirement of the transmission.

Description

technical field [0001] The invention relates to an improved eight-speed transmission, which belongs to the technical field of vehicle transmission. Background technique [0002] A typical multi-speed transmission uses a combination of friction clutches, planetary gearing, and fixed interconnections to achieve multiple gear ratios. The number and physical arrangement of planetary gear sets is usually dictated by packaging, cost and desired speed ratios. While current transmissions have served their intended purpose, the need for new and improved transmission configurations is virtually constant as automobiles proliferate. [0003] The improvement of the transmission configuration mainly starts from the following two aspects. One is performance, specifically including the range of transmission ratio, responsiveness and smoothness; the other is packaging, mainly reducing size and weight. When the gear is determined, The number of components required to achieve fixed gears is ...

Claims

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Application Information

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IPC IPC(8): F16H57/023F16H3/66
CPCF16H3/66F16H2200/006F16H2200/2012F16H2200/2046F16H57/023F16H2306/00
Inventor 丁华锋韩文剑张召蔡长旺
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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