JPH0627842Y2 - Accumulator structure of automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an accumulator structure for an automatic transmission.

[Prior Art] In an automatic transmission, the engine output torque-converted by a torque converter is further torque-converted or rotation-reversed according to the shift range, vehicle speed, throttle opening, etc. selected by the driver. A gear train, which essentially consists of planetary gears, is provided for controlling the rotation or controlling the rotation.

And, to switch the set position of the above gear train,
This is performed by several hydraulic clutches and hydraulic brakes that are turned on and off by the oil pressure of the oil supplied from the oil pump. The switching of the hydraulic pressure supply system for each hydraulic clutch and hydraulic brake according to the selected shift range is performed by a manual valve.

By the way, when switching the set position of the gear train,
When the hydraulic pressure introduced from the manual valve is directly applied to the hydraulic clutch or hydraulic brake corresponding to the switching, the gears of the gear train suddenly mesh,
At that time, there is a problem that a shock occurs in the gear train.

Therefore, an automatic transmission provided with an accumulator has been proposed in order to slow the increase in hydraulic pressure introduced from a manual valve to a predetermined hydraulic clutch or hydraulic brake (for example, Japanese Patent Laid-Open No. 62-233547). reference).

For example, as shown in FIG. 5, such an accumulator includes a cylindrical recess 52 formed inside the valve body 51, and a piston 53 slidably arranged in the recess 52 in the axial direction. When the hydraulic pressure is introduced into the hydraulic pressure supply passage 55, the piston 53 slides in the direction of the bottom surface 56 of the recess 52 against the biasing force of the spring 54 when the hydraulic pressure is introduced into the hydraulic pressure supply passage 55. The hydraulic clutch (not shown) is utilized by utilizing the phenomenon that the hydraulic pressure in the hydraulic pressure supply passage 55 is controlled to a value that balances with the urging force of the spring 54 while the piston 53 is slid. The increase speed of the hydraulic pressure introduced in (1) is slowed down.

[Problems to be Solved by the Invention] By the way, as shown in FIG. 5, in such a conventional accumulator, one end of the spring 54 is fitted into a hole 57 provided in the bottom surface 56 of the recess. By doing so, it is fixed to the bottom surface 56 of the recess.

However, in such a fixing method of the spring 54,
The spring 54 may be set out of the hole 57 during assembly, or the end of the spring 54 fitted in the hole 57 may come out of the hole 57 when the spring 54 is fully extended. Spring 54
In such a state, since the spring 54 is in a compressed state compared to the normal state, there is a problem that the characteristics of the accumulator are changed and the operation of the hydraulic clutch is defective.

In order to prevent such a problem, it is conceivable to fix the end of the spring on the bottom surface side of the recess to the bottom surface of the recess using an appropriate fixing tool. Not practical because it is difficult to remove.

The present invention has been made in view of the above conventional problems, and has a simple structure in which the spring can be easily attached or detached, and the spring can be reliably arranged and held at a predetermined position. An object is to provide an accumulator for an automatic transmission.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a recess formed in a valve body, a piston slidably disposed in the recess, and one end of the recess having a recess. In an accumulator structure of an automatic transmission having a spring fixed to one bottom surface and the other end fixed to a piston and biasing the piston in a sliding direction, the accumulator structure is shaped to fit into the recess, and A guide plate having a notch formed in the center and a mounting portion formed by bending a protrusion formed in the notch is provided, and the end of the spring on the side fixed to the bottom surface of the recess Part is fixed to the mounting part of the guide plate, the guide plate is arranged in the recess so as to be in close contact with the bottom surface of the recess, and the end portion of the spring is fixed to the bottom surface of the recess and the spring is recessed. Provided is an accumulator structure for an automatic transmission, which is arranged at a center position of the section.

[Operation and Effect of the Invention] According to the present invention, the spring end on the side that abuts the bottom surface of the recess in the valve body is integrally attached to the center of the guide plate, and the spring is disengaged from the center of the guide plate. Then, the guide plate is placed in close contact with the bottom surface of the recess of the valve body. Here, if the shape of the guide plate is substantially the same as the shape of the bottom surface of the recess with a slight clearance, the guide plate is fixed in the spreading direction of the bottom surface of the recess. Moreover, since the guide plate is constantly pressed against the bottom surface of the recess by the biasing force of the spring, the guide plate is completely fixed on the bottom surface of the recess. Therefore, the spring can be reliably arranged and held at the predetermined position.

Furthermore, assembling the spring into the recess requires only inserting the guide plate to which one end of the spring is attached into the recess, and removing the spring only requires pulling out the guide plate. It is possible to improve.

[Examples] Examples of the present invention will be specifically described below.

As shown in FIG. 4, in the automatic transmission AT, the torque of the crankshaft 1 directly driven by the engine (not shown) is converted by the torque converter 2 and transmitted to the transmission shaft 3 to transmit the transmission shaft 3 Is further converted by the gear train 4 substantially consisting of a planetary gear according to the selected shift range, vehicle speed, throttle opening, etc. and transmitted to the output shaft 5, or transmitted to the output shaft 5. It is designed to shut off.

The gear train 4 is set in a predetermined combination by several hydraulic clutches and hydraulic brakes according to the shift range selected by the driver, the vehicle speed, the throttle opening, etc. In the figure, only the reverse clutch 6 that operates when switching between the neutral position and the reverse position is shown.

Hereinafter, a hydraulic pressure introduction system to the reverse clutch 6 will be described.

The oil stored in the oil storage tank 11 is stored in the oil pump 1
2, the oil is supplied to the manual valve 14 through the oil supply passage 13. The discharge pressure of the oil pump 12 is maintained at a predetermined value by the regulator valve 15.

The position of the manual valve 14 is changed according to the selected shift range, so that the hydraulic pressure is introduced into the hydraulic pressure introducing system to the hydraulic clutch and the hydraulic brake corresponding to the shift range. For example, when the change lever is shifted from the neutral range to the reverse range, the manual valve 14 introduces the oil pressure of the oil supply passage 13 into the reverse clutch oil pressure introduction passage 17 whose downstream end is connected to the reverse clutch 6. It is set to a proper position.

The reverse clutch hydraulic pressure introducing passage 17 for introducing the hydraulic pressure of the oil supply passage 13 to the reverse clutch 6 via the manual valve 14 prevents a shock from occurring in the gear train 4 when shifting to the reverse range. Therefore, an accumulator AC that slows the rate of increase of the hydraulic pressure introduced to the reverse clutch 6 is provided.

The accumulator AC has a cylindrical recess 22 formed in the valve body 21, a piston 23 slidably arranged in the recess 22 in the axial direction thereof, and one end of which is described in detail later. Is fixed to the bottom surface 24 of the concave portion 22 via a guide plate 30 (see FIG. 1), and the other end of the concave portion 22 abuts against the piston 23 and is directed toward the opening side of the concave portion 22 (left side in FIG. 4). A biasing spring 25 is provided. Also, the outer peripheral surface of the piston 23 and the recess 2
An annular line pressure introducing chamber 2 formed between the inner peripheral surface of
The hydraulic pressure of the oil pump 12 is constantly introduced into the valve 6 through the line pressure introducing passage 27. This line pressure introduction chamber 2
The area of the annular surface which receives the hydraulic pressure in the opening direction of the concave portion 22 (leftward in FIG. 4) of 6 is set to be larger than the area of the annular surface which receives the hydraulic pressure in the concave bottom surface 24 direction (rightward in FIG. 4). Therefore, the piston 23 is pressed by the line oil pressure in the line pressure introducing chamber 26 toward the opening of the recess 22 (to the left in FIG. 4).

Then, when shifting to the reverse range, the manual valve 1 is provided in the reverse clutch hydraulic pressure introducing passage 17.
The oil pressure in the oil supply passage 13 is introduced via the oil pressure passage 4, and this oil pressure is also introduced in the oil pressure chamber 29 formed in the recess 22 on the opening side of the piston 23. At this time, the hydraulic pressure in the hydraulic chamber 29 causes the piston 23 to move the bottom surface 24 of the recess 24.
It is pressed to the side and slid in this direction. While the piston 23 slides toward the bottom surface 24 of the recessed portion, the hydraulic pressure in the hydraulic chamber 29 increases the urging force of the spring 25 which gradually increases as the piston 23 slides and the line pressure introducing chamber 26. The size is in balance with the resultant force of the internal line hydraulic pressure and the pressing force in the direction of the opening of the recess 22 (of course, it increases momentarily). When the resultant force reaches a level corresponding to the hydraulic pressure in the oil supply passage 13, the piston 23 stops, and the hydraulic pressure in the hydraulic chamber 29 at this time becomes substantially equal to the hydraulic pressure in the oil supply passage 13. Then, the hydraulic pressure introduced to the reverse clutch 6 at this time becomes substantially equal to the hydraulic pressure in the oil supply passage 13, and the gear train 4 is set to the reverse position.

Hereinafter, a method of fixing the spring 25 to the bottom surface 24 of the recess 22 will be described.

As shown in FIG. 1, the ends of the springs 25 on the side fixed to the bottom surface 24 of the recess 22 are fixed to the four mounting portions 31 a of the guide plate 30 so as to be located in the central portion of the guide plate 30. The spring 25 and the guide plate 30 are integrally formed. The guide plate 30 is arranged in close contact with the bottom surface 24 of the recess 22.

Then, the guide plate 30 is formed in a disk shape smaller than the bottom surface 24 of the recess by a clearance (see FIG. 2). When the guide plate 30 is arranged on the bottom surface 24 of the recess, the guide plate 30 is positioned inside the recess 22. The side surface fixes the recess bottom surface 24 with respect to the spreading direction. Further, since the guide plate 30 is constantly pressed against the bottom surface 24 of the recess by the biasing force of the spring 25, the guide plate 30 is completely fixed on the bottom surface 24 of the recess, and therefore the end of the spring 25 on the bottom surface side of the recess is surely secured. Fixed to.

Further, as shown in FIG. 2, a notch 32 is formed in the center of the guide plate 30. Four protrusions 31 are formed in the notch 32, and the protrusions 31 are bent in a direction perpendicular to the spreading surface of the guide plate 30 to form the mounting portion 31a, as shown in FIG. It

In such a configuration, when the spring 25 is assembled in the recess 22, the guide plate 30 may simply be fitted in the recess 22, and when the spring 25 is removed, the guide plate 30 may be pulled out from the recess 22. .

Therefore, according to the present invention, the spring 25 can be reliably arranged and held at the predetermined position of the recess 22 in the valve body 21 with a simple structure, and the assembling workability and the workability can be improved. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view in the vicinity of a mounting portion of a spring and a guide plate of an accumulator of an automatic transmission showing an embodiment of the present invention. FIG. 2 is a plan view of the guide plate shown in FIG. FIG. 3 is an elevational view of the guide plate shown in FIG. FIG. 4 is a system configuration diagram of a hydraulic system of an automatic transmission having an accumulator according to the present invention. FIG. 5 is a vertical cross-sectional explanatory view of a conventional accumulator used in an automatic transmission. AT: automatic transmission, AC: accumulator, 1 ...
… Crankshaft, 2 …… Torque converter, 3 …… Transmission shaft, 4 …… Gear train, 5 …… Output shaft,
6 ... Reverse clutch, 12 ... Oil pump, 13
...... Oil supply passage, 14 ...... Manual valve, 17
...... Reverse clutch hydraulic pressure introduction passage, 21 ...... valve body, 22 ...... recess, 23 ...... piston, 24 ...... recess bottom, 25 ...... spring, 30 ...... guide plate.

Claims (1)

[Scope of utility model registration request] 1. A recess formed in a valve body, a piston slidably disposed in the recess, one end of which is fixed to one bottom surface of the recess and the other end of which is a piston. In an accumulator structure of an automatic transmission including a spring that is fixed and biases the piston in a sliding direction, the accumulator structure has a shape that fits in a recess, and a notch is formed in the center to form the notch. A guide plate having a mounting portion formed by bending the protruding portion is provided, and the end of the spring on the side fixed to the bottom surface of the recess is fixed to the mounting portion of the guide plate. It is arranged in the recess so as to be in close contact with the bottom surface of the recess, the above-mentioned end portion of the spring is fixed to the bottom surface of the recess, and the spring is arranged at the center position of the recess. Accumulator structure of the dynamic transmission.