KR20080013385A - An automatic transmission for a vehicle - Google Patents

Abstract

An automatic transmission for a vehicle is provided to reduce a manufacturing cost and a weight thereof by forming a sharing piston between two brakes. An L/R brake(2) and a second brake(4) are arranged adjacently to each other. The L/R brake and the second brake are not operated at the same time. A sharing piston(10) is arranged between frictional members(6,8) for forming the L/R brake and the second brake in order to operate selectively the frictional members. The sharing piston includes a slider(22) formed at an upper side of the piston and a pressing unit(24) formed at a lower side of the piston. The sharing piston is inserted into left and right retainers(30,32) for forming left and right oil pressure chambers(26,28). The pressing unit presses selectively the left and right frictional members.

Description

Automotive automatic transmission {AN AUTOMATIC TRANSMISSION FOR A VEHICLE}

1 is a partial excerpt of the automatic transmission according to the present invention.

Figure 2 is an enlarged view of the main portion of the present invention.

3 is a partial excerpt of an automatic transmission for a conventional description.

The present invention relates to an automatic transmission for a vehicle, and more particularly, to form two brakes that do not operate simultaneously in a state arranged adjacent to each other, so that the piston is shared so that the configuration can be simplified and the overall length can be reduced. It relates to a vehicle automatic transmission.

For example, an automatic transmission for a vehicle has a torque converter and a power train, which is a multi-stage transmission gear mechanism connected to the torque converter, and selectively selects one of the operating elements of the power train according to the driving state of the vehicle. It will have a hydraulic control system for operation.

In designing such an automatic transmission, conceptual design and design plan are presented to find a design concept that meets the design goals, and one of the best design concepts in terms of performance, durability, reliability, mass production, and manufacturing cost Will be selected.

When the design concept as described above is selected, the development is generally divided into three parts, a mechanical section, a hydraulic control system, and an electronic control system. In the mechanical section, the power train to which the present invention relates is at least two or more. Composed of a simple planetary gear set, it consists of a complex planetary gear set that can achieve the required shift stage.

In configuring the power train as described above, as shown in FIG. 3, the L / R brake 100 operating in the L range and the reverse range and the 2nd brake 102 operating in the second forward speed are disposed adjacent to each other.

These brakes 100 and 102 each have a plurality of multi-plate brakes 104 and 106 and pistons 108 and 110 for actuating these multi-plate brakes 104 and 106.

Accordingly, when the brakes 100 and 102 are selectively operated, when the hydraulic pressure is supplied to the hydraulic chambers 112 and 114 by the hydraulic control system, the piston 108 and 110 move, and the multi-plate brake 104 ( 106) to work.

However, although the L / R brake and the 2nd brake are not independently operated in the shifting process, the L / R brakes and the 2nd brakes are configured independently, and thus have a problem of complicating the internal configuration of the transmission.

In addition, the use of a large number of parts implies a problem of rising costs and weight reduction.

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to form two brakes that do not operate simultaneously in a state arranged adjacent to each other, simplifying the configuration to share the piston and At the same time, it is possible to reduce the overall length, thereby providing a vehicle automatic transmission that can reduce the production cost and weight accordingly.

In order to realize this, in the present invention, the L / R brake and the 2nd brake which are not operated simultaneously in all shift stages are arranged adjacent to each other,

An automatic transmission for a vehicle is provided by arranging a shared piston capable of selectively operating these friction members between the friction members forming the L / R brake and the 2nd brake.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 and 2 are views showing parts of the automatic transmission to which the present invention is applied and enlarged main parts, L / R brakes 2 operating in the L range and the reverse range, and 2nd brakes 4 operating in the forward 2 speeds. ) Are placed next to each other.

In arranging the brakes 2 and 4, the shared piston 10 is disposed between the friction members 6 and 8 forming the brakes 2 and 4.

The friction members 6 and 8 are composed of a plurality of brake discs 12 and 14 fixed to the rotating body and a plurality of brake plates 18 and 20 fixed to the transmission case 16, as is known in the art. They are braked by mutual friction.

In addition, the piston 10 disposed between the friction members 6 and 8 includes an upper slider 22 and a lower pressurizing portion 24 so that both sides of the slider 22 are left and right hydraulic. It is inserted into the left and right piston retainers 30 and 32 forming the seals 26 and 28.

Accordingly, the piston 10 is moved left and right by the hydraulic pressure selectively supplied to the left and right hydraulic chambers 26 and 28, and when the brake is released, the same hydraulic pressure is supplied to both hydraulic chambers 26 and 28. This eliminates the need for existing restore structures.

In addition, seals 34 and 36 are mounted at both ends of the slider 22 to prevent leakage of hydraulic pressure.

In addition, both sides of the pressing portion 24 are formed in a vertical plane to operate the L / R brake 2 when moving to the right in the drawing, and to operate the 2nd brake 4 when moving to the left.

Therefore, when the L / R brake 2 is to be operated, the hydraulic pressure of the right hydraulic chamber 28 is discharged, and when the hydraulic pressure is supplied to the left hydraulic chamber 26, the piston 10 moves to the right by the hydraulic pressure thereof. In order to operate the L / R brake 2 and to operate the 2nd brake 2, the hydraulic pressure of the left hydraulic chamber 26 is discharged and the hydraulic pressure is supplied to the right hydraulic chamber 28. By the piston 10 is moved to the left to operate the 2nd brake (4).

As described above, according to the present invention, while forming two brakes that do not operate simultaneously in a state arranged adjacent to each other, the piston is shared so that the configuration can be simplified and the overall length can be reduced, and accordingly production It is an invention that can reduce the cost and weight.

Claims (3)

Place L / R brakes and 2nd brakes that do not operate simultaneously in all gears next to each other, And a shared piston for selectively operating these friction members between the L / R brakes and the friction members forming the 2nd brakes.  The piston of claim 1, wherein the piston comprises an upper slider and a lower pressurizing portion, and both portions of the slider are inserted into left and right piston retainers which form left and right hydraulic chambers, and the lower pressurizing portion is selectively left. , The automatic transmission for a vehicle, characterized in that configured to press the right friction member. 3. The vehicular automatic transmission as set forth in claim 2, wherein both ends of the slider are provided with an airtight seal.

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