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Automatic transmission

A technology of automatic transmission and brake, which is applied in the direction of transmission, gear transmission, transmission control, etc., can solve the problems of difficult to reduce cost, difficult to reduce size, large one-way clutch, etc., and achieve cost reduction and compact structure. Effect

Active Publication Date: 2014-05-28
AISIN AW CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, since the one-way clutch itself is expensive, it is difficult to reduce the cost by improving the structure of the one-way clutch in this way to prevent slippage, and since the one-way clutch is large, it is difficult to reduce the size

Method used

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Embodiment Construction

[0032] In the following, reference will be made to Figure 1 to Figure 8 Example embodiments of the present invention are described.

[0033] General structure of automatic transmission

[0034] First, refer to figure 2 The general structure of the automatic transmission 3 to which the present invention can be applied will be described. like figure 2 As shown, a preferred automatic transmission 3, for example for use in a FF (front-engine, front-wheel drive) vehicle, has an input shaft 8 of the automatic transmission connectable to an engine (not shown), and a shaft centered on the axis of the input shaft 8 The torque converter 4 and the automatic transmission mechanism 5.

[0035]The torque converter 4 has: a pump impeller 4a connected to the input shaft 8 of the automatic transmission 3; and a water turbine runner 4b to which the rotation of the pump impeller 4a is transmitted via hydraulic fluid. The water turbine runner 4b is connected to the input shaft 10 of the a...

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Abstract

An automatic transmission including an input shaft connected to a drive source; an output shaft connected to a driving wheel; a one-way clutch; friction engagement elements which establish speeds by changing a transmission path between the input shaft and the output shaft based on the application state of the friction engagement elements and application of the one-way clutch, one of the friction engagement elements being a brake that is applied when coasting in a take-off speed. The automatic transmission also includes a controller that determines whether it is possible to initially establish the take-off speed using the one-way clutch based on a predetermined condition, and, if not possible, then the controller establishes the take-off speed by applying the brake.

Description

technical field [0001] The present invention relates to an automatic transmission mounted on a vehicle or the like. More particularly, the present invention relates to an automatic transmission capable of smooth starting. Background technique [0002] There has been proposed a related automatic transmission in which a one-way clutch and a second brake are arranged in parallel. During launch, first forward gear is established by applying the first clutch and automatically applying the one-way clutch according to the speed of the third gear. When coasting (ie when the engine brake is applied), a second brake arranged in parallel with the one-way clutch is applied instead of the one-way clutch (see PTL 1). [0003] reference list [0004] patent documents [0005] PTL 1: Japanese Patent Application Publication No. 2008-121843 [0006] In an automatic transmission such as that described in PTL 1, the first forward gear is established by applying the first clutch and the one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/66
CPCF16H61/0437F16H59/72F16H2061/044F16H2312/02
Inventor 清水哲也土田建一铃木明智石川和典山口雅路
Owner AISIN AW CO LTD