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Fail-safe mechanism for automatic transmission, and fail-safe valve provided in the fail-safe mechanism

An automatic transmission, fail-safe technology, used in mechanical equipment, transmission control, components with teeth, etc., can solve the increase in assembly man-hours and assembly operations complexity, increase in fail-safe valve size, and increase in production costs, etc. problems, to achieve the effect of suppressing the increase in production cost, preventing weight increase, and solving valve sticking

Inactive Publication Date: 2010-02-24
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the technique described in the document JP-A-2004-036670, it is necessary to reattach the inner spring 503 fitted between the valve element 500 and the plunger 502 and the inner spring 503 used as the seat of the springs 501, 503. Washer 504
[0010] Therefore, there is a possibility of causing an increase in the size and weight of the entire fail-safe valve since it is necessary to secure the insertion space of these members.
In addition, there is a possibility of causing an increase in production cost related to an increase in the number of constituent parts, and there is a possibility of causing an increase in the number of assembly man-hours and complication of assembly operations

Method used

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  • Fail-safe mechanism for automatic transmission, and fail-safe valve provided in the fail-safe mechanism
  • Fail-safe mechanism for automatic transmission, and fail-safe valve provided in the fail-safe mechanism
  • Fail-safe mechanism for automatic transmission, and fail-safe valve provided in the fail-safe mechanism

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Embodiment Construction

[0049] Embodiments of the present invention will be described below with reference to the drawings. As an embodiment, a case where the present invention is applied to an automatic transmission mounted in an FF (front-engine, front-wheel drive) vehicle will be described. Before describing the configuration and operation of the fail-safe valve which is a feature of the embodiment, the basic operation and the like of a power train for a vehicle and an automatic transmission of a vehicle will be described.

[0050] Such as figure 1 As shown, a vehicle Z is equipped with an engine 1 , a torque converter 2 , an automatic transmission 3 , and an ECU 100 . Each of engine 1 , torque converter 2 , automatic transmission 3 , and ECU 100 will be described below.

[0051] The engine 1 is, for example, a four-cylinder gasoline engine. A crankshaft 11 , which is an output shaft of the engine 1 , is connected to an input shaft of the torque converter 2 . The rotational speed (engine rota...

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Abstract

In a fail-safe mechanism for an automatic transmission (3), when a predetermined gearshift (Rev) is positioned in the automatic transmission (3) during a non-failure state of the automatic transmission, a first valve unit (70) moves from a non-failure position toward a failure position as the oil pressure for positioning the predetermined gearshift (Rev) is caused to act on a fail-safe valve (50)as an extraneous matter-discharging oil pressure (PR).

Description

technical field [0001] The present invention relates to a fail-safe mechanism for an automatic transmission installed in a motor vehicle and the like, and to a fail-safe valve provided in the fail-safe mechanism. More particularly, the present invention relates to improvements in fail-safe valves configured to discharge foreign matter and the like. Background technique [0002] As one example of an automatic transmission installed in a motor vehicle or the like, a planetary gear type automatic transmission in which a shift position (gear position) is set by using a clutch, a brake, or a planetary gear device is well known. In a vehicle in which such an automatic transmission is mounted, the target shift position is calculated based on the vehicle speed and the accelerator operation amount (or throttle opening), and the appropriate shift position is determined by applying the clutch and brake as frictional engagement elements. Engagement or disengagement is automatically set...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/12F16H59/70F16H61/00F16H61/68F16H61/684F16H61/686
CPCF16H2061/1264F16H61/12F16H2061/0043
Inventor 东井浩臣伊藤慎一西峯明子土田建一
Owner TOYOTA JIDOSHA KK
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