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Three-gear electric assembly and speed ratio determination method thereof

A technology for determining the method and speed ratio, which is applied in the field of automobile transmission, can solve problems such as insufficient climbing ability and poor acceleration performance of the whole vehicle, and achieve the effects of large climbing ability, smooth shifting, and good comfort

Active Publication Date: 2019-04-05
BYD CO LTD
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a three-speed electric assembly and a method for determining its speed ratio i

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  • Three-gear electric assembly and speed ratio determination method thereof
  • Three-gear electric assembly and speed ratio determination method thereof
  • Three-gear electric assembly and speed ratio determination method thereof

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[0078] In order to make the technical problems, technical solutions, and beneficial effects solved by the present invention clearer, the following describes the present invention in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0079] Such as figure 1 As shown, the three-speed electric assembly provided by an embodiment of the present invention includes a motor 2, a differential (not shown in the figure), and a three-speed transmission.

[0080] In this embodiment, the three-speed transmission includes a box (not shown in the figure), an input shaft 1, a first countershaft 11, a second countershaft 17, a planetary gear mechanism, a first-speed driving gear 7, a first-speed slave Driving gear 9, second-speed driving gear 8, second-speed driven gear 10, third-speed driving gear 15, third-speed dri...

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Abstract

The invention provides a three-gear electric assembly and a speed ratio determination method thereof. The three-gear electric assembly includes a motor, a differential mechanism and a three-gear transmission, the three-gear transmission is connected between the motor and the differential mechanism so that a first-gear speed ratio, a second-gear speed ratio and a third-gear speed ratio can be generated between the motor and the differential mechanism, and the speed ratio stage difference between the second-gear speed ratio and the third-gear speed ratio is larger than the speed ratio stage difference between the first-gear speed ratio and the second-gear speed ratio. The three-gear electric assembly can reach a large speed ratio range, and the motor works in a high-efficiency area for a long time, so that a carried whole vehicle has large climbing ability and high maximum vehicle speed, gear shifting is smooth, and the comfort is better.

Description

technical field [0001] The invention belongs to the technical field of automobile transmission, and in particular relates to a three-speed electric assembly and a method for determining a speed ratio thereof. Background technique [0002] The planetary gear mechanism has the characteristics of large transmission ratio, small size, stable operation and large carrying capacity. By using the planetary gear mechanism, different speed ratio requirements can be realized in a limited space. For example, using a planetary gear structure, a three-speed transmission with compact space and simple structure can be obtained. [0003] An existing electric three-speed planetary gearbox includes a casing and a rotatable input shaft mounted on the casing. There are planetary gears in the box, and a synchronizer on the left and right is coaxially arranged on the input shaft; the left driven plate of the left synchronizer is coaxially fixed with the input shaft, and the driving plate of the ...

Claims

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Application Information

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IPC IPC(8): F16H3/44
CPCF16H3/44F16H2200/2005F16H2200/0021F16H2200/0039
Inventor 李冬冬汤秋彬
Owner BYD CO LTD
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