JP2002310295A - Operation device for automatic transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict manufacturing cost, and contract occupied space in an operation device for an automatic transmission for a vehicle by simplifying constitution and assembling processes. SOLUTION: This operation device to displace a valve rod 11 of a control valve 1 to advance or retract for speed change control of an automatic transmission for a vehicle is provided with a rotation power source 2, a reducer 3 to reduce rotation power generated by the rotation power source 2, and a feed screw device 4 to directly displace the valve rod 11 of the control valve 1 to advance or retract. Since the feed screw device 4 as a universal item generally on the market is thus used, constitution of a power transmission system from the motor 2 to the control valve 1 is simplified, and the whole body of the operation device can be compact. Since this has speed reducing effect, a reduction ratio of the reducer 3 can be largely reduced compared to conventional devices, thereby constitution of the reducer 3 can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for shifting an automatic transmission mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art As a conventional operation device of this type, for example, one disclosed in Japanese Patent Application Laid-Open No. Hei 7-310820 is known.

[0003] This is because when a control shaft is rotated by a required angle through a speed reducer by rotating a motor in response to a driver's operation, a fan-shaped detent plate fixed to the control shaft is rotated by a required angle. While being rotated, the valve stem attached to the detent plate is moved forward and backward, and the control valve is driven according to the amount of forward and backward displacement of the valve stem, thereby switching the automatic transmission.

After the valve stem is moved forward and backward, a detent spring attached to a control valve is engaged with a gear portion provided on the detent plate, so that the position of the valve stem is fixed. I try to make it.

[0005]

In the above conventional example, the power transmission means from the motor to the valve stem of the control valve and the positioning means for the valve stem consist of a large number of independent parts, so that the construction and the assembly process are complicated, The manufacturing cost increases and the occupied space increases.

In view of such circumstances, an object of the present invention is to reduce the manufacturing cost and reduce the occupied space in an operating device for an automatic transmission for a vehicle by simplifying the configuration and assembling process. .

[0007]

According to a first aspect of the present invention, there is provided an operating device for an automatic transmission for a vehicle, in which a valve stem of a control valve for controlling a shift of the automatic transmission for a vehicle is moved forward and backward. A rotary power source for generating rotary power, a speed reducer for reducing the rotary power generated by the rotary power source, and converting the reduced rotary power into linear propulsion force to directly connect the valve stem of the control valve. And a feed screw device for performing forward and backward displacement.

The operating device for an automatic transmission for a vehicle according to the present invention comprises:
According to a second aspect of the present invention, in the configuration of the first aspect,
The feed screw device has a configuration in which a nut member and a screw member are directly screwed together, and one of them is axially immovable and coupled to the output portion of the reduction gear so as to be synchronously rotatable,
Further, the other is freely displaceable in the axial direction and is coaxially and synchronously rotatably connected to the valve stem of the control valve.

[0009] The operating device for an automatic transmission for a vehicle according to the present invention comprises:
According to a third aspect of the present invention, in the configuration of the first aspect,
The feed screw device has a configuration in which a nut member and a screw member are indirectly screwed via a plurality of balls, and one of them is axially immovable and can be synchronously rotated with respect to an output portion of the speed reducer. The control valve is characterized in that the other end is axially displaceable and coaxially rotatably connected to the valve stem of the control valve.

[0010] The operating device for an automatic transmission for a vehicle according to the present invention comprises:
According to a fourth aspect, in the configuration of the third aspect,
The feed screw device is characterized in that a positioning means is provided for preventing a member connected to the valve stem from being retracted by a reaction force from the valve stem.

[0011] The operating device for an automatic transmission for a vehicle according to the present invention comprises:
According to a fifth aspect, in the configuration of the fourth aspect,
As the positioning means, an output section of the rotary power source,
When the rotational power of the rotational power source is input, the torque is transmitted to the speed reducer, while being locked when the rotational power source is not driven and reverse rotational power is input from the speed reducer side, the motor rotates with the speed reducer. A reverse input cutoff device for separating the power source from the power source is provided.

The operation device for an automatic transmission for a vehicle according to the present invention includes:
According to a sixth aspect of the present invention, in the configuration of the fifth aspect,
A first rotating body integrally connected to an output shaft of a rotary power source, and a transmission shaft to a reduction gear side coaxially opposed to the first rotating body, wherein the reverse input cutoff device is integrally connected to the first rotating body. Second
A rotating body, a movable friction body that is synchronously rotatable and axially displaceable with respect to the second rotating body, and is fixedly arranged so as to be non-rotatable, and the movable friction body is axially displaced so as to be pressed against each other. Alternatively, while the rotating power source is not driven, the movable friction member is pressed against the fixed friction member to bring the second rotating body into a non-rotating state while the rotating power source is not driven, while driving the rotating power source. And a cam mechanism for displacing the movable frictional member in the axial direction, separating from the fixed frictional member, and coupling the two rotating members in a state capable of synchronous rotation.

[0013] The operating device for an automatic transmission for a vehicle according to the present invention comprises:
According to a seventh aspect, in the configuration of the sixth aspect,
A cam plate integrally fixed to the first rotating body and opposed to the movable friction member in the axial direction, a pair of cam grooves provided on both opposed surfaces of the cam plate and the movable friction member, A clutch ball interposed between the two cam grooves, and the clutch ball rolls in the cam groove in the circumferential direction to press the movable friction member against the fixed friction member. Alternatively, it is displaced so as to be separated.

The operating device of the automatic transmission for a vehicle according to the present invention comprises:
According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect, the movable friction body is formed of an annular plate that is spline-fitted to the outer periphery of the second rotating body, and the first rotating body is provided on the outer peripheral surface thereof. A tapered cone surface is formed, the diameter of which is reduced toward the body, and the fixed friction body is formed of a cylindrical case that is concentrically and fixedly arranged so as to surround the outer periphery of the movable friction body. The tapered cone surface of which the tapered cone surface is pressed or separated in accordance with the axial displacement of the movable friction body is formed in a required area in the axial direction.

In short, according to the present invention, as a power transmission means from the rotary power source to the valve stem of the control valve, a feed screw device for converting the rotary power of the rotary power source into a linear propulsion force after decelerating the rotary power by the reducer is used. ing.

This feed screw device directly displaces the valve stem by a member which is displaced in the axial direction. Generally, a commercially available general-purpose product can be used, and the structure of the power transmission means is simplified. And the overall operation device can be made more compact. In addition, since the feed screw device has a speed reducing action, the speed reduction ratio of the speed reducer can be set to be much smaller than that of the conventional example, and the structure of the speed reducer can be simplified.

In particular, if the feed screw device has a structure in which the nut member and the screw member are directly screwed together, the valve stem of the control valve can be used when the rotary power source is not driven. Since positioning can be performed in the axial direction, positioning means for positioning the valve stem in the axial direction is not required.

Further, if a ball screw device having excellent power transmission efficiency is employed as the feed screw device, the operation of receiving the rotational power and moving the valve stem of the control valve forward and backward can be performed. It becomes extremely smooth, and there is no rattling during the shifting operation. However, in the ball screw device, since the power transmission efficiency is excellent, the reverse rotation power to the rotary power source is easily input by the reaction force from the valve rod when the rotary power source is stopped. By providing positioning means, it is preferable to block the input of reverse rotational power from the control valve side to the rotational power source, thereby positioning the valve stem of the control valve in the axial direction.

If a reverse input blocking device as described in claim 5 is used as the positioning means, no external control is required, so that the control of the shift operation is not complicated, and It is advantageous in that it can be installed compactly and easily between the rotary power source and the reduction gear.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described in detail with reference to embodiments shown in the drawings.

FIGS. 1 to 5 show an embodiment of the present invention. 1 is a perspective view showing an operation device of the automatic transmission for a vehicle, FIG. 2 is a cross-sectional view of a speed reducer and a ball screw device shown in FIG. 1, and FIG. 3 is a cross-sectional view of a reverse input cutoff device shown in FIG. 4 is an exploded perspective view of the reverse input cutoff device of FIG. 3, and FIG.
FIG. 4 is a cross-sectional view of a state where the cam mechanism of the reverse input blocking device is developed in a circumferential direction.

The operating device of the vehicle automatic transmission shown in the figure comprises a control valve 1 and a motor 2 as a rotating power source.
, A reduction gear 3, a ball screw device 4 as a feed screw device, a parking lock device 5, and a reverse input cutoff device 6 as a positioning means.

The control valve 1 is a vehicle automatic transmission (automatic transmission), not shown.
The valve rod 11 is provided so as to be able to advance and retreat in and out.

The motor 2 comprises, for example, a stepping motor, and its output shaft 21 is connected to the speed reducer 3. The output shaft 21 of the motor 2 is arranged in parallel with the valve rod 11 of the control valve 1.

The speed reducer 3 has a structure in which two spur gears are combined, and includes an input gear 31, a large-diameter output gear 32 meshed with the input gear 31, and a case 33 for accommodating these.
And The output shaft 21 of the motor 2 is connected to the input gear 31 via the reverse input cutoff device 6 so as to be synchronously rotatable, and the output gear 32 is connected to the nut member 41 of the ball screw device 4 so as to be synchronously rotatable. .

The ball screw device 4 converts the rotational power given from the output gear 32 of the speed reducer 3 into an axial propulsion force, and includes a nut member 41, a screw member 42, a plurality of balls 43, A circulation tube 44.

The nut member 41 is formed by forming a spiral groove on the inner peripheral surface of the cylindrical member, and is connected to the output gear 32 as the final reduction gear of the speed reducer 3 so as to be synchronously rotatable in an axially immobile state. Have been.

The screw member 42 is formed by forming a spiral groove on the outer peripheral surface of a cylindrical member, and is inserted through the inner periphery of the nut member 41 so as to be axially displaceable. They are coaxially connected so as to be synchronously rotatable.

The ball 43 is rotatably interposed between a spiral groove (not shown) of the nut member 41 and a spiral groove (not shown) of the screw member 42.

The ball circulation tube 44 is connected to the nut member 4.
The ball 43 is circulated by being connected to both ends of a ball path formed by the first spiral groove and the spiral groove of the screw member 42.

The parking lock device 5 restrains the valve rod 11 so as not to move in the axial direction when the control valve 1 is in the parking state, and includes a rod 51 and a cam 52.
, A coil spring 53, a lock arm 54, and a lock gear 55.

The rod 51 has one end fixed to the screw member 42 of the ball screw device 4, and after being bent 90 degrees from the middle, the displacement direction of the valve stem 11 of the control valve 1 is changed. Extend straight and parallel,
The other end is slidably supported by the cylinder member 56.

The cam 52 is formed of a cylindrical member which is fitted axially displaceably in the middle of the linear extension of the rod 51,
The diameter is gradually reduced from the middle in the axial direction toward the other shaft end.

The coil spring 53 is sheathed in a region between the cam 52 and a retaining ring 57 attached at a predetermined position on the outer periphery of the linear extension of the rod 51,
2 is urged toward the supporting end of the rod 51.

The lock arm 54 is swingably supported by a pin 58 arranged in parallel with the linearly extending portion of the rod 51, and is provided with a projection 59 projecting upward at an upper part in the longitudinal direction. ing.

The lock gear 55 is disposed above the lock arm 54, and the lock gear 55
The four protrusions 59 are engaged and disengaged.

As shown in FIGS. 3 to 5, the reverse input cut-off device 6 transmits the rotational power of the motor 2 to the speed reducer 3 when it is input, while the reverse power cut-off device 6 transmits the rotational power to the speed reducer 3 when the motor 2 is not driven. The motor 2 and the speed reducer 3 are locked by being locked when reverse rotation power is input from the side 3, the first rotation shaft 61, the second rotation shaft 62, and an annular plate as a movable friction body 63, a cylindrical case 64 as a fixed friction body,
It has a cam mechanism 65 and a conical coil spring 66.

The first rotating shaft 61 is formed of a cylindrical member.
The output shaft 21 of the motor 2 is spline-coupled to the center hole.

The second rotating shaft 62 is coaxial with the first rotating shaft 61 and has one end supported so as to be rotatable relative to the center hole of the first rotating shaft 61. Thus, the input gear 31 of the speed reducer 3 is spline-coupled.

The annular plate 63 is spline-fitted so as to be synchronously rotatable and axially displaceable with respect to the outer periphery of the second rotating shaft 62, and has its outer peripheral surface reduced in diameter toward the first rotating shaft 61. A tapered cone surface 63a is formed.

The cylindrical case 64 is concentrically and non-rotatably fixed so as to surround the outer periphery of the annular plate 63, and is provided in an axially required area on the inner peripheral surface thereof in accordance with the axial displacement of the annular plate 63. A tapered cone surface 64a is formed to press or separate the tapered cone surface 63a.

When the motor 2 is not driven, the cam mechanism 65 presses the annular plate 63 against the cylindrical case 64 to bring the second rotating shaft 62 into the non-rotating state while the motor 7
The annular plate 63 is displaced in the axial direction along with the drive of, and is separated from the cylindrical case 64 to couple the two rotating shafts 61 and 62 in a state in which they can be synchronously rotated. The cam plate 65 is formed integrally with the first rotating shaft 61 and is opposed to the annular plate 63 in the axial direction.
51 and a pair of cam grooves 652, 6 provided on both opposing surfaces of the cam plate 651 and the annular plate 63, respectively.
53 and a clutch ball 654 interposed between the cam grooves 652 and 653, respectively. Both cam grooves 65
2, 653 is formed in a mortar shape having a depth decreasing from the center in the circumferential direction to both sides in the circumferential direction.
The roller 54 is displaced so as to be pressed against or separated from the cylindrical case 64 by rolling in the two cam grooves 652 and 653 in the circumferential direction.

The conical coil spring 66 has an annular plate 63
And an E-shaped retaining ring 67 engaged in a peripheral groove 62 a on the outer peripheral surface of the second rotating shaft 62 in a compressed state, and the tapered cone surface 63 a of the annular plate 63 is
The annular plate 63 is resiliently urged toward the cam plate 651 side of the cam mechanism 65 so as to be pressed against the tapered cone surface 64a.

The first rotating shaft 61 is supported by a cylindrical case 64 via a single row deep groove ball bearing 68, and the shaft end of the second rotating shaft 62 is inserted into the shaft insertion hole 61 a of the first rotating shaft 61. The part is fitted and supported so as to be relatively rotatable. The second rotating shaft 62 is connected to the first rotating shaft 61 via a circlip 69.
Are positioned in the axial direction.

Next, the operation of the above operating device will be described.

First, in response to an appropriate shift operation, the motor 2
Is rotated in the required direction by the required angle, the nut member 41 of the ball screw device 4 is rotated through the required angle through the speed reducer 3. Accordingly, the screw member 42 is displaced by a required stroke in a required axial direction while being rotated.
Is displaced in the pushing direction or the pulling direction.
Thus, the shift operation of the automatic transmission (automatic transmission) is controlled by the control valve 1. As described above, by controlling the displacement stroke of the screw member 42 of the ball screw device 4, gear shift control by an automatic transmission (automatic transmission) can be performed.

When the automatic transmission (automatic transmission) is parked by the control valve 1, the valve rod 11 of the control valve 1
And the rod 51 and the cam 5 of the parking lock device 5 in accordance with the axial displacement of the screw member 42 of the ball screw device 4.
2 is pushed. As a result, first, the conical surface of the cam 52 and then the cylindrical surface abut against the lower portion of the lock arm 54 to gradually push the lock arm 54 upward, so that the projection 58 of the lock arm 54 comes into contact with the tooth bottom of the lock gear 55. And the lock gear 5
5 is locked in a non-rotatable state, so that wheels (not shown) are locked.

When the motor 2 is not driven and the valve rod 11 of the control valve 1 is in a state other than the parking position, the screw member 42 of the ball screw device 4 is displaced by the reaction force from the valve rod 11. The reverse input blocking device 6 prevents this from being performed.

That is, when the motor 2 is in a non-driven state, the tapered cone surface 63a of the annular plate 63 is pressed against the tapered cone surface 64a of the cylindrical case 64 by the conical coil spring 66 when the motor 2 is not driven. Shaft 62
Is locked and is in a non-rotation state. In this state, since the motor 2 and the speed reducer 3 are separated, the reverse rotation power is not input to the motor 2 through the ball screw device 4 and the speed reducer 3 due to the reaction force of the valve rod 11 of the control valve 1. The valve stem 11 is positioned so as not to move in the axial direction.

On the other hand, when the first rotating shaft 61 is rotated by driving the motor 2, the clutch ball 65 is rotated.
4 rolls in the circumferential direction and pushes the annular plate 63 against the conical coil spring 66, so that the tapered cone surface 63a is separated from the tapered cone surface 64a of the cylindrical case 64. Annular plate 63
And the second rotation shaft 62 are integrally rotated synchronously. As a result, the rotational power of the motor 2 is transmitted to the speed reducer 3, and the valve rod 11 of the control valve 1 is moved forward and backward as described above.

As described above, the operating device in this embodiment employs the ball screw device 4 as a feed screw device for converting the rotational power of the motor 2 into a linear propulsion force. General-purpose products can be used, and the configuration can be simplified and the device can be made more compact. In addition, since the ball screw device 4 has a speed reducing action, the speed reduction ratio of the speed reducer 3 can be significantly reduced as compared with the conventional example, and the number of gears used can be reduced, thereby simplifying the structure. This also contributes to cost reduction and reduction of occupied space.

Further, in the ball screw device 4, since the power transmission efficiency is excellent, the operation of sending the valve rod 11 of the control valve 1 by receiving the rotational power of the motor 2 becomes smooth, and the rattling during the speed change operation is reduced. Thus, it is possible to improve the responsiveness of the shift operation and the driving efficiency of the motor 2.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, the ball screw device 4 is mounted on the ball screw tube 4 using the ball circulation tube 44.
Although the circulation type is used in which the balls 3 are circulated, a non-circulation type in which the balls 43 are held by a retainer may be used.

(2) In the above embodiment, the ball screw device 4 is exemplified as the feed screw device, but a type in which the nut member 41 and the screw member 42 are directly screwed together can be used. In this case, although the power transmission efficiency is inferior to that of the ball screw device 4, since the reaction force of the valve rod 11 of the control valve 1 is received by the deceleration action, the backward displacement of the screw member 42 can be prevented. This is advantageous in that the reverse input blocking device 6 as the positioning means described above can be dispensed with.

(3) In the above embodiment, the reverse input cutoff device 6 is used as the positioning means, but it can be embodied in various other structures.

[0057]

According to the first to eighth aspects of the present invention, as the power transmission means from the rotary power source to the control valve,
Since the feed screw device is used, general-purpose products that are generally available on the market can be used, and the structure of the power transmission means can be simplified and the entire operation device can be made compact. The speed reduction ratio of the speed reducer can be significantly reduced as compared with the conventional example, and the structure of the speed reducer can be simplified.

In particular, according to the second aspect of the present invention, since the feed screw device has a structure in which the nut member and the screw member are directly screwed together, the valve stem of the control valve is pivoted when the rotary power source is not driven. Positioning can be performed in a fixed direction, and positioning means for positioning the valve stem in the axial direction becomes unnecessary. This contributes to simplification of the configuration and cost reduction.

According to the third aspect of the present invention, since the ball screw device having excellent power transmission efficiency is used as the feed screw device, the operation of receiving the rotational power and moving the valve stem of the control valve forward and backward is extremely smooth. That is, it is possible to eliminate rattling at the time of a gear shifting operation, thereby improving the responsiveness of the gear shifting operation and the driving efficiency of the rotary power source.

According to the fourth aspect of the present invention, the ball screw device according to the third aspect has a problem in that the power transmission efficiency is excellent, that is, a reaction force from the valve stem when the rotary power source is stopped causes the rotary power source to fail. In consideration of the fact that reverse rotation power is likely to be input, a positioning means is provided, so input of reverse rotation power from the control valve side to the rotation power source is cut off, and the valve stem of the control valve is positioned in the axial direction. It can be preferred.

According to the fifth to eighth aspects of the present invention, since the reverse input cutoff device is used as the positioning means, external control is not required, and the control of the shift operation is not complicated, and the rotational power is not required. It is preferable because it can be installed compactly and easily between the source and the speed reducer.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an operating device of a vehicular automatic transmission according to an embodiment of the present invention.

FIG. 2 is a sectional view of the speed reducer and the ball screw device shown in FIG. 1;

FIG. 3 is a sectional view of the reverse input cutoff device shown in FIG. 1;

FIG. 4 is an exploded perspective view of the reverse input cutoff device of FIG. 3;

FIG. 5 is a sectional view showing a state in which a cam mechanism of the reverse input blocking device is developed in a circumferential direction.

[Explanation of symbols]

 Reference Signs List 1 control valve 11 coil spring valve stem 2 motor 3 reduction gear 4 ball screw device 41 ball screw device nut member 42 ball screw device screw member 5 parking lock device 6 reverse input cutoff device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J062 AA18 AB21 AB22 AC07 BA11 BA12 CD02 CD04 CD12 CD21 3J067 AA24 AB02 AB24 AC03 DA41 DB32 FB83 GA01

Claims (8)

[Claims] 1. An operating device for moving a valve stem of a control valve for shifting control of an automatic transmission for a vehicle, comprising: a rotating power source for generating a rotating power; and a rotating power generated by the rotating power source. An automatic transmission for a vehicle, comprising: a speed reducer that reduces the speed; and a feed screw device that converts the reduced rotational power into a linear propulsion force to directly advance and retract the valve stem of the control valve. Operating device. 2. The operating device for an automatic transmission for a vehicle according to claim 1, wherein said feed screw device has a structure in which a nut member and a screw member are directly screwed together, and one of them is axially immovable. And is coupled to the output part of the reduction gear so as to be synchronously rotatable,
The operating device for an automatic transmission for a vehicle, wherein the other end is freely displaceable in the axial direction and coaxially and synchronously rotatably connected to the valve stem of the control valve. 3. The operating device for an automatic transmission for a vehicle according to claim 1, wherein said feed screw device has a configuration in which a nut member and a screw member are indirectly screwed through a plurality of balls. One is axially immovable and synchronously rotatable with respect to the output of the reducer, and the other is axially displaceable and coaxially synchronously rotatable with the control valve stem. An operation device for an automatic transmission for a vehicle, comprising: 4. The operating device for an automatic transmission for a vehicle according to claim 3, wherein a member on a side of said feed screw device connected to the valve stem is prevented from being displaced backward by a reaction force from the valve stem. Operating device for an automatic transmission for a vehicle, characterized by comprising means. 5. The operating device for a vehicle automatic transmission according to claim 4, wherein the positioning unit includes an output unit of the rotary power source,
When the rotational power of the rotational power source is input, the torque is transmitted to the speed reducer, while being locked when the rotational power source is not driven and reverse rotational power is input from the speed reducer side, the motor rotates with the speed reducer. An operation device for an automatic transmission for a vehicle, further comprising a reverse input cutoff device for disconnecting the power source from the power source. 6. The operating device for an automatic transmission for a vehicle according to claim 5, wherein the reverse input cutoff device is integrally connected to an output shaft of a rotary power source; A second coaxially opposed transmission shaft integrally connected to the transmission shaft to the reduction gear side;
A rotating body, a movable friction body which is synchronously rotatable with respect to the second rotating body and is axially displaceably mounted, and is fixedly arranged so as to be non-rotatable and is displaced in the axial direction so as to be pressed. Alternatively, the movable frictional body is pressed against the fixed frictional body when the rotary power source is not driven, and the second rotary body is brought into a non-rotational state while the rotating power source is not driven. And a cam mechanism that displaces the movable friction member in the axial direction with the cam member and separates the movable friction member from the fixed friction member and connects the two rotating members in a state in which they can be synchronously rotated. Operating device for automatic transmission. 7. The operating device for an automatic transmission for a vehicle according to claim 6, wherein the cam mechanism is integrally fixed to the first rotating body and is opposed to a movable friction body in an axial direction; A pair of cam grooves provided on both opposing surfaces of the plate and the movable friction body, and a clutch ball interposed between the two cam grooves, one for each clutch ball; An operating device for an automatic transmission for a vehicle, wherein a movable frictional body is displaced so as to be pressed against or separated from a fixed frictional body by rolling in a circumferential direction. 8. The operating device for an automatic transmission for a vehicle according to claim 6, wherein said movable friction member comprises an annular plate which is spline-fitted to an outer periphery of said second rotating body. First
A tapered cone surface is formed, the diameter of which is reduced toward the rotating body, and the fixed friction body is a cylindrical case that is concentrically and fixedly arranged so as to surround the outer periphery of the movable friction body, and has an inner periphery thereof. An operating device for an automatic transmission for a vehicle, characterized in that a tapered cone surface of which a tapered cone surface is pressed or separated in accordance with an axial displacement of the movable friction body is formed in a required axial area of the surface.