JP2001090753A - Two-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-way clutch of a structure in which press work is possible for majour component members capable of enlarging a rated capacity by use of piece members under shearing load to achieve lightness, compactness and low cost. SOLUTION: This two-way clutch comprises an inner ring 2 having plural pockets 4 in an outer circumferential surface, an outer ring 5 engaged with the inner ring 2 and having plural pockets 7 in an inner circumferential surface, a cam ring 8 having a cam surface 14 in an inner circumferential surface, piece members 12 contained in the pockets 4 in the inner ring 2 to be capable of advancing and retracting in diametric directions, elastic members 13 provided in the pockets 4 in the inner ring 2 to energize the piece members 12 to the outer diameter side, and a switch spring 20 installed on the inner ring 2 to hold the phase to the cam ring 8 at a specified position, and by controlling the phase of the cam ring 8, push-in of the piece members 12 is released, thereby the inner ring 2 and the outer ring 5 are engaged with each other through the piece members 12 to transmit power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way clutch used for transmitting and disconnecting a rotational force.

[0002]

2. Description of the Related Art Conventionally, two-way clutches used for transmitting and interrupting a rotational force include a clutch using a roller as an engaging element and a clutch using a sprag. In these clutches, a wedge space is formed by providing a cylindrical surface on one side of the inner ring and the outer ring and a cam surface or a bidirectional cylindrical surface on the other side, and a roller or sprag is engaged in the wedge space in this wedge space. And so that it can be shifted to the neutral position,
By changing the position of the roller or the angle of the sprag,
It is designed to transmit and cut off rotation in two directions.

[0003]

In the above-described conventional two-way clutch, the thickness of the inner ring and the outer ring needs to be considerably large in terms of rigidity in any case. There is a problem that the shape becomes large in proportion to the torque transmission capacity to be performed, and it is difficult to reduce the weight, size, and cost.

Accordingly, an object of the present invention is to provide a structure in which main components can be press-worked and to increase the rated capacity by using a bridge member under a shearing load, thereby reducing the weight and size. Another object of the present invention is to provide a novel two-way clutch that can realize low cost.

[0005]

In order to solve the above-mentioned problems, a first aspect of the present invention is to superimpose a first member and a second member, and a plurality of openings each having an opening on the superimposed surface. Forming a pocket, accommodating a piece member and an elastic member for biasing the piece member toward the overlapping surface side in the pocket of the first member, and facing the pocket of the first member;
A cam wheel having a cam surface for controlling the advance and retreat of the bridge member is arranged adjacent to the second member.

According to a second aspect of the present invention, there is provided an inner member having an opening on an outer peripheral surface and having a plurality of pockets, and an outer member which is fitted to the inner member and is opened on an inner peripheral surface and has a plurality of pockets. A cam wheel having a cam surface formed on an inner peripheral surface, a piece member accommodated in a pocket of the inner member movably in a radial direction, and a piece member accommodated in the pocket of the inner member, and attaching the piece member to an outer diameter side. A biasing elastic member, and a switch spring mounted on the inner member and holding a phase of the cam ring at a predetermined position. By controlling a phase of the cam ring, a pocket of the inner member and the outer member is formed. Match
In this case, power is transmitted by engaging the inner member and the outer member via the bridge member.

According to a third aspect of the present invention, there is provided an inner member having an opening on an outer peripheral surface and having a plurality of pockets, and an outer member which is fitted on the inner member and is opened on an inner peripheral surface and has a plurality of pockets. A cam ring having a cam surface formed on an outer peripheral surface, a piece member accommodated in a pocket of the outer member movably in a radial direction, and a pocket housed in the outer member for urging the piece member toward the inner diameter side. An elastic member and a switch spring mounted on the inner member and holding the phase of the cam ring at a predetermined position, and controlling the phase of the cam ring to match the pockets of the inner member and the outer member. Let
In this case, power is transmitted by engaging the inner member and the outer member via the bridge member.

According to a fourth aspect of the present invention, there is provided an inner member having an opening at an axial end face and having a plurality of pockets formed thereon, and a plurality of pockets formed externally fitted to the inner member and having an opening at the axial end face. An outer member, a cam ring having a cam surface formed on an axial end surface, a piece member housed in the pocket of the inner member movably in the axial direction, and a shaft housed in the pocket of the inner member. An elastic member biasing outward in the direction,
A switch spring mounted on the inner member and holding the phase of the cam ring at a predetermined position; controlling the phase of the cam ring so that the pockets of the inner member and the outer member coincide with each other; A structure is adopted in which the inner member and the outer member are engaged with each other via a member to transmit power.

According to a fifth aspect of the present invention, in the first to fourth aspects, a case is rotatably fitted to the outer member,
A torque transmitting portion is provided on the outer member and the case, and a configuration is provided in which a gap in the rotational direction is provided in the torque transmitting portion.

A sixth aspect of the present invention is the invention according to the fifth aspect of the invention, in which an elastic body is provided at both ends in the rotational direction of the torque transmitting portion.

A seventh aspect of the present invention is the invention according to the first to sixth aspects, wherein the number of pockets formed in each of the inner member and the outer member is different.

An eighth aspect of the present invention is the invention according to the first to seventh aspects, wherein the width of the pocket on the side where the piece member is stored is slightly smaller than the width of the counterpart pocket.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the two-way clutch 1.
The inner ring 2 serving as an inner member is provided with a spline 3 for coupling to a shaft or the like at an inner diameter portion, and a plurality of pockets 4 opened on an outer peripheral surface are fixed on an outer periphery thereof in a circumferential direction. It is formed with an interval arrangement.

An outer ring 5, which is an outer member rotatably fitted to the inner ring 2, is provided with a slit 6 for forming a torque transmitting portion by being connected to a flange, a case, or the like at an outer diameter portion.
And a protruding portion 6a, on the inner periphery of which are formed a plurality of pockets 7 which are opened on the inner peripheral surface at regular intervals in the circumferential direction.

The outer ring 5 is set to be slightly thinner than the inner ring 2, and a cam ring 8 is disposed adjacent to one surface of the outer ring 5, and the side plate 1, which is overlapped on both surfaces of the outer ring 5 and fixed with studs 9.
At 0 and 11, the outer ring 5 and the cam ring 8 are sandwiched, and the outer ring 5 and the cam ring 8 are relatively rotatable,
The inner ring 2 is relatively rotatably held by one of the side plates 10 and the cam ring 8, thereby forming the entire unit.

In each pocket 4 of the inner ring 2, a piece member 12 accommodated so as to be able to advance and retreat in the radial direction and an elastic member 13 such as a spring for urging the piece member 12 to the outer diameter side are accommodated. . When the piece member 12 is pushed into the pocket 4, the entire length thereof is accommodated in the pocket 4, and the tip of the piece member 12 is engaged with the pocket 7 of the outer race 5 by protruding from the pocket 4.

The width of the pocket 4 on the side of the inner ring 2 containing the piece member 12 is made slightly smaller than the width of the pocket 7 on the outer ring 5 side, so that the degree of freedom of the movement of the piece member 12 with respect to the outer ring 5 side pocket 7 is increased. , Rock and free response.

The inner ring 2, the outer ring 5, the side plates 10, 11 and the like have a structure that can be pressed, and the two-way clutch 1
Weight and cost can be reduced.

The surface of the cam ring 8 overlapping the outer ring 5 and the inner ring 2 has a step corresponding to the difference in thickness between the outer ring 5 and the inner ring 2,
The inner periphery of this step portion is fitted around the outer periphery of the inner ring 2 exactly, and the cam surface 14 is formed on the inner peripheral surface of the step portion.

The cam surface 14 of the cam wheel 8 has a shape in which cam ridges 15 and recesses 16 are alternately continuous in the circumferential direction, and the boundary between the cam ridges 15 and the recesses 16 is an inclined surface. The spacing and the number in the circumferential direction correspond to the spacing and the number of the pockets 4 provided in the inner ring 2. When the cam ridge 15 of the cam ring 8 faces the pocket 4 of the inner ring 2, the cam ridge 15 Is pressed into the pocket 4 of the inner ring 2.

A cylindrical extension arm 1 coupled to the cam wheel 8
7 is provided with a notch 18 in the circumferential direction, and two pins 19 are erected at an interval corresponding to the circumferential length of the notch 18 on the inner ring 2 so as to correspond to the notch 18 and arranged in the extension arm 17. The switch spring 20, which is an elastic member, is flexed to
0 a is set in the two pins 19 and the notch 18.

When the phases of the notch 18 and the two pins 19 match, as shown in FIG.
Is a phase in which the cam ridge 15 presses the bridge member 12 into the pocket 4 of the inner ring 2, and in this state, the bridge member 12 and the outer ring 5
There is a gap in the inner periphery of the inner ring 2 so that the inner ring 2 and the outer ring 5 are not engaged with each other and can be idle.

Here, the examples shown in FIGS. 1 to 3A are as follows.
By setting the number of pockets 4 provided in the inner ring 2 and the number of pockets 7 of the outer ring 5 to be different numbers, and by arranging the two pockets 4 and 7 at a plurality of locations, the engagement angle of the piece member 12 with respect to the pocket 7 is improved. In the example shown in FIG.

In the example shown in FIG. 3B, the number of pockets 4 provided in the inner race 2 and the number of pockets 7 in the outer race 5 are the same, and the engagement of the bridge member 12 with all the pockets 7 occurs simultaneously. To increase the transmission torque.

The two-way clutch according to the first embodiment of the present invention has the above-described structure.
When the cam ring 8 does not rotate at a constant angle with respect to the inner ring 2 in a state where the inner ring 2 is stationary, the cam ridge 15 of the cam ring 8 causes the piece 12 to be moved into the pocket 4 of the inner ring 2 by the action of the switch spring 20. The phase becomes the pushed-in state, and the bridge member 12
Is held at a position where it does not engage with the inner ring 2 and is in a free state, and the inner race 2 maintains a stationary state.

On the other hand, when the cam wheel 8 is rotated by a predetermined angle with respect to the inner wheel 2 as shown in FIG. Then, the cam ridge 15 releases the pushing of the bridge member 12 to release the concave portion 1.
6 faces the bridge member 12, the bridge member 12
Of the outer ring 5 in the direction of the pocket 7 of the outer ring 5 and by fitting into the pocket 7, the inner ring 2 and the outer ring 5
2, the inner ring 2 and the outer ring 5 are locked, and the inner ring 2 rotates integrally regardless of the direction in which the outer ring 5 rotates.

As described above, the bridge member 12 for connecting the inner ring 2 and the outer ring 5 has a block shape and is used under a shearing load between the inner ring 2 and the outer ring 5, so that the rated capacity can be increased. Combined with the possibility of press working, downsizing of the two-way clutch 1 can be realized.

When the cam wheel 8 is returned to a position where the notch 18 and the two pins 19 match with respect to the inner ring 2 in the locked state of the inner ring 2 and the outer ring 5 as described above, the cam mountain 15 moves and pushes the piece member 12 into the pocket 4 of the inner race 2 to release the lock between the inner race 2 and the outer race 5, whereby the inner race 2 comes to a standstill.

As described above, the two-way clutch 1 of the present invention can switch between locking and free of the inner wheel 2 and the outer wheel 5 by controlling the circumferential phase of the cam wheel 8 with respect to the inner wheel 2. .

Next, FIGS. 4A and 4B show a two-way clutch 1 according to a second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described. The same applies to the following embodiments.

The two-way clutch 1 of the second embodiment
In the pocket 7 of the outer ring 5, a piece member 12 accommodated so as to be able to advance and retreat in the radial direction and an elastic member 13 such as a spring for biasing the piece member 12 toward the inner diameter side are accommodated. When the piece member 12 is pushed into the pocket 7, the entire length thereof is accommodated in the pocket 7, and the tip of the piece member 12 is engaged with the pocket 4 of the inner race 2 by protruding from the pocket 7.

The inner ring 2 is formed to be thinner than the outer ring 5, and the surface of the cam ring 8 overlapping the outer ring 5 and the inner ring 2 has a step corresponding to the difference in thickness between the outer ring 5 and the inner ring 2. The outer periphery of the step portion is just fitted to the inner periphery of the outer ring 5, and a cam surface 14 having the same number of cam ridges 15 as the pockets 7 of the outer ring 5 is formed on the outer peripheral surface of the step portion.

The two-way clutch 1 according to the second embodiment
Also, by controlling the circumferential phase of the cam wheel 8 with respect to the inner ring 2, the piece member 12 is disengaged from the pocket 4 of the inner ring 2, and it is possible to switch between locking and free of the inner ring 2 and the outer ring 5. .

In the illustrated example, the pocket 7 of the outer race 5 is provided.
And the same number of pockets 4 of the inner ring 2, but the number of pockets 7 provided on the outer ring 5 and the number of pockets 4 of the inner ring 2 are different numbers,
In addition, the two pockets 4 and 7 may be arranged so as to coincide at a plurality of locations.

FIGS. 5A and 5B show two-way clutch 1.
3 shows a third embodiment. The two-way clutch 1 according to the third embodiment is of a type in which the inner member 2 and the outer wheel 5 are switched between free and locked by moving the bridge member 12 in the axial direction.

The inner race 2 is formed in an L-shaped cross section with an annular ridge provided at one end of the outer peripheral surface, and a plurality of pockets 4 penetrating in the axial direction are provided on the ridge at regular intervals in the circumferential direction. ,
The outer ring 5, which is rotatably fitted to the ridge, is formed in an L-shaped cross section with an annular ridge provided on the other end side on the inner peripheral surface thereof. A plurality of pockets 7 opening at a surface facing the inner ring 2 are provided at regular intervals in the circumferential direction, and a side plate 10 attached to the inner periphery of the outer ring 5 and the outer ring 5 are provided.
The outer ring 5 and the inner ring 2 are unitized by sandwiching the ridge of the inner ring 2 between the ridges.

In a pocket 4 provided in the inner ring 2, a piece member 12 accommodated so as to be able to advance and retreat in the axial direction and an elastic member 13 such as a spring for biasing the piece member 12 outward in the axial direction are accommodated. Have been. When the piece member 12 is pushed into the pocket 4 of the inner ring 2, the entire length of the piece member 12 is accommodated in the pocket 4, and the tip thereof is engaged with the pocket 7 of the outer ring 5 by protruding from the pocket 4.

The cam ring 8 is formed in a cylindrical shape and rotatably fits between the inner circumference of the ridge provided on the outer ring 5 and the outer circumference of the inner ring 2, and comes off with a retaining ring 21 provided on the outer circumference of the inner ring 2. A cam surface 14 having the same number of cam ridges 15 as the number of pockets 4 of the inner ring 2 is formed on the distal end surface thereof, and a cylindrical extension arm 17 and an inner ring connected to the outer end of the cam ring 8. 2 are provided with cutouts 18 and 22 in the circumferential direction, and a switch spring 20 which is an elastic member disposed outside the extension arm 17 is bent so that both ends 20 a are set in the cutouts 18 and 22.

The two-way clutch 1 of the third embodiment
In the phase, the cam member 15 of the cam wheel 8 faces the piece member 12 with respect to the inner ring 2, the piece member 12 is pushed into the pocket 4 of the inner ring 2, and the outer ring 5 and the inner ring 2 are disconnected. Be free.

When the cam wheel 8 is rotated with respect to the inner ring 2 and the moved cam lobe 15 releases the pushing of the bridge member 12, the bridge member 12 is axially protruded by the action of the elastic member 13. Move toward the ridge and the pocket 7
The inner ring 2 and the outer ring 5 are locked and rotate integrally.

The two-way clutch 1 of the third embodiment
Has a very small radial dimension (radial direction), which results in a very compact clutch.

FIG. 6 shows a fourth embodiment of the two-way clutch 1. In the two-way clutch 1 according to the fourth embodiment, the case 31 is rotatably fitted to the outer race 5, and the plurality of torque transmitting portions 3 are fitted to the fitting portion between the outer race 5 and the case 31.
2 and a gap 33 in the rotational direction is provided in the torque transmitting portion 32.
And elastic members 34 are provided at both ends in the rotation direction of the torque transmitting portion 32.

The torque transmitting portion 32 is provided with a concave portion 35 in which the projection 6a of the outer ring 5 is fitted on the inner diameter surface of the case 31 which is rotatably fitted to the outer ring 5, and is provided in the radial direction of the concave portion 35. By setting the width along the width to be greater than the width of the protrusion, a gap 33 in the rotation direction is formed in the recess 35, and the relative rotation between the outer ring 5 and the case 31 is enabled within the range of the gap 33. .

The relationship between the torque transmitting portion 32 and the pocket 4 of the inner race 2 and the pocket 7 of the outer race 5 is such that the rotation of the case 31 causes the end of the recess 35 to contact the projection 6 a via the elastic body 34. In this state, the outer ring 5 is rotated so that the phases of the two pockets 4 and 7 coincide with each other, so that the bridge member 12 is fitted over the two pockets 4 and 7.
4, when the piece member 12 is disengaged from the pockets 4 and 7, the restoring elasticity pushes the protruding portion 6 a of the outer ring 5 abutted from the end of the concave portion 35 and rotates into the concave portion 35. The direction gap 33 is secured.

FIG. 7 shows an example in which an electromagnetic clutch 36 is combined with the two-way clutch 1 of the fourth embodiment and used as an on-demand device for a four-wheel drive vehicle.

In FIG. 7, the two-way clutch 1 is mounted on the output shaft 37 of the transfer connected to the front wheel drive shaft.
The inner ring 2 is coupled to the output shaft 37 so as to rotate integrally therewith,
An input gear 40 rotatably mounted on the output shaft 37 via a bearing 39 and a case 31 fitted to the outer ring 5 rotatably via a bearing 38 on the output shaft 37 and the case 31.
Are connected so as to rotate together.

The electromagnetic clutch 36 incorporated between the output shaft 37 and the case 31 has a bearing 42 mounted on the output shaft 37 inside a rotor guide 41 press-fitted and fixed to the inner diameter of the case 31.
A rotor 43 rotatably supported via the rotor 43 is fixed, and an electromagnetic coil 44 housed inside the rotor 43 is attached to a transfer case 45. The cam wheel 8 and the armature 46 of the two-way clutch 1 are formed by urging the armature 46 in a direction away from the rotor 43 with a wave spring 47 so as to freely rotate and move in the axial direction. They are connected so as to be integrally movable in the rotational direction and movable in the axial direction.

The cam ring 8 of the two-way clutch 1 is held in a phase in which each cam peak 15 faces the bridge member 12 by the action of a switch spring 20 provided between the cam ring 8 and the inner ring 2.

When the four-wheel drive vehicle runs in the auto mode, the output shaft 37 is stopped, but the input gear 40 rotates, and the case 31, the rotor guide 41, and the rotor 43 connected thereto rotate integrally. The two-way clutch 1 pushes the bridge member 12 into the pocket 4 of the inner ring 2 at each cam crest 15 of the cam ring 8 by the action of the switch spring 20, and the outer ring 5
And the inner ring 2 are free from coupling.

When the rear wheel of the automobile idles in this state, the power supply to the electromagnetic coil 44 is turned on, the armature 46 is attracted to the rotor 43 by the attraction force of the electromagnetic coil 44, and the rotation of the rotor 43 is performed via the armature 46. The cam wheel 8 rotates and overcomes the force of the switch spring 20, and each cam peak 15 separates from the piece member 12 to release the push, and the piece member 12 jumps out of the pocket 4 of the inner ring 2. The outer wheel 5 engages with the pocket 7 of the outer wheel 5, thereby connecting the outer wheel 5 and the inner wheel 2, and the rotation of the outer wheel 5 is transmitted to the output shaft 37 via the inner wheel 2, resulting in a four-wheel drive state in which the front wheels are driven.

As shown in FIG. 8, in the structure in which the outer ring 5 and the case 31 are directly connected so as to rotate integrally, when the positional relationship between the pocket 7 of the outer ring 5 and the pocket 4 of the inner ring 2 is within a certain range, When the energization of the coil 44 is turned ON, the movement of the cam wheel 8 becomes small, and a case where the outer ring of the piece member 12 bites into the pocket as shown in FIG. If so, the engagement of the bridge member 12 with the pocket 7 of the outer ring 5 may be released.

On the other hand, in the fourth embodiment, a rotational direction gap 33 is set between the outer ring 5 and the torque transmitting portion 32 of the case 31, and elastic members 34 are provided at both ends of the torque transmitting portion 32. Therefore, the engagement of the bridge member 12 with the pocket 7 of the outer race 5 is ensured, and the engagement does not come off even if there is a torque fluctuation or vibration during traveling.

That is, since the case 31 and the rotor 43 are integrated, when the energization of the electromagnetic coil 44 is turned on, the armature 46 is integrated with the rotor 43 and the cam wheel 8 starts rotating. , The outer ring 5 remains stopped without rotating until the gap 33 disappears. For this reason, even if the cam ridge 15 of the cam wheel 8 comes off, the piece member 12 does not fit in the pocket 7 of the outer ring 5.

When the gap 33 between the outer ring 5 and the torque transmitting portion 32 of the case 31 disappears, the outer ring 5 rotates, and when the phases of the pocket 7 of the outer ring 5 and the pocket 4 of the inner ring 2 match, the cam ring 8 Since the cam ridge 15 is completely separated from the bridge member 12, the bridge member 12 jumps out of the pocket 4 of the inner ring 2 and sufficiently engages with the pocket 7 of the outer ring 5, whereby the outer ring 5 and the inner ring 2 are connected. Even if torque fluctuations and vibrations occur during traveling, there is no occurrence of detachment of the bridge member 12 from the pocket 7 of the outer race 5, and this is effective in traveling in which forward and backward traveling is repeated.

However, when repeating intermittent progress,
The gap 33 between the outer ring 5 and the torque transmitting portion 32 of the case 31 does not work effectively. For this reason, when the elastic members 34 are attached to both ends of the torque transmitting portion 32, when the bridge member 12 is disengaged from the pocket 7 of the outer ring 5 during traveling and the outer ring 5 and the inner ring 2 are uncoupled from each other, The projection 6a is pushed by the restoring elasticity of the elastic body 34, and a gap can be secured in the torque transmitting section 32 as shown in FIG.

Although the two-way clutch 1 of the fourth embodiment is shown using the same one as in the first embodiment shown in FIGS. 1 to 3, the second and third embodiments are shown. The same effect can be obtained even if the two-way clutch 1 is adopted.

[0058]

As described above, according to the present invention, a plurality of open pockets are formed in the overlapping surface of the inner ring and the outer ring, and a piece member and the piece member are overlapped in one pocket. The cam member is formed with a cam surface for controlling the advance and retreat of the piece member facing the one pocket while accommodating the elastic member biasing to the side. A novel two-way clutch capable of switching between lock and free can be formed, and furthermore, the components can be pressed, and a lightweight, compact and low-cost two-way clutch can be provided.

Further, since the bridge member is used between the inner ring and the outer ring under a shearing load, it is possible to reduce the size and increase the rated capacity.

Further, if the number of the inner ring and the number of the outer ring pockets are the same, the torque can be transmitted by all of the bridge members, and the large torque can be transmitted while being small, and the number of the inner ring and the number of the outer ring pockets is different. Thereby, the engagement angle can be set small, and the responsiveness of the switching operation between lock and free is improved.

Further, since a rotational gap is provided in the torque transmitting portion provided between the outer ring and the case fitted to the outer ring, and elastic members are provided at both ends of the torque transmitting portion, the cam member is completely separated from the bridge member. The inner ring and the outer ring can be locked in the state of being disengaged, the piece member can be securely bitten over the pockets of the inner ring and the outer ring, and the piece member does not come off the pocket during rotation transmission, This is effective in rotation transmission that repeats rotation.

[Brief description of the drawings]

FIG. 1A is a front view showing a first embodiment of a two-way clutch, and FIG. 1B is a longitudinal sectional view thereof.

FIG. 2 is an exploded perspective view of a two-way clutch.

FIG. 3A is a front view showing a locked state of an inner wheel and an outer wheel in the first embodiment of the two-way clutch, and FIG.
Is a front view showing an example of the same number of inner and outer ring pockets

FIG. 4A is a front view showing a second embodiment of a two-way clutch, and FIG. 4B is a longitudinal sectional view of the same.

5A is a longitudinal sectional view showing a third embodiment of a two-way clutch, and FIG. 5B is a longitudinal sectional front view taken along arrow bb in FIG. 5A.

FIG. 6 is a front view showing a fourth embodiment of the two-way clutch.

FIG. 7 is a longitudinal sectional front view showing an example in which the two-way clutch of the fourth embodiment is used as an on-demand device of a four-wheel drive vehicle.

FIG. 8 is an enlarged front view of a main part of a torque transmission unit showing an example of a two-way clutch when an outer ring and a case are directly connected.

FIG. 9 is an enlarged front view of a main part of a torque transmission unit showing an example of a two-way clutch according to a fourth embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Two-way clutch 2 Inner ring 4 Pocket 5 Outer ring 6a Projection part 7 Pocket 8 Cam ring 12 Piece member 13 Elastic member 14 Cam surface 15 Cam mountain 16 Depression 20 Switch spring 31 Case 32 Torque transmission part 33 Gap 34 Elastic body 35 Recess 36 Electromagnetic clutch

Claims (8)

[Claims] 1. A first member and a second member are overlapped with each other,
A plurality of open pockets are formed in the overlapping surface, and a piece member and an elastic member for urging the piece member toward the overlapping surface are accommodated in the pocket of the first member. A two-way clutch, wherein a cam wheel which faces a pocket of the member and has a cam surface for controlling the advance / retreat of the piece member is made adjacent to the second member. 2. An inner member having an opening on the outer peripheral surface and having a plurality of pockets, an outer member fitted to the inner member and having an opening on the inner peripheral surface and having a plurality of pockets, and an inner member having an inner peripheral surface. A cam wheel forming a cam surface, a piece member accommodated in the pocket of the inner member so as to be able to advance and retreat in the radial direction, and an elastic member accommodated in the pocket of the inner member and biasing the piece member to the outer diameter side. A switch spring mounted on the inner member and holding a phase with the cam wheel at a predetermined position. By controlling the phase of the cam wheel, the pockets of the inner member and the outer member are matched, Through the piece member,
A two-way clutch, wherein power is transmitted by engaging the inner member and the outer member. 3. An inner member having an opening on the outer peripheral surface and having a plurality of pockets, an outer member fitted to the inner member and having an opening on the inner peripheral surface and having a plurality of pockets, and a cam on the outer peripheral surface. A cam ring having a surface, a piece member accommodated in the pocket of the outer member so as to be able to advance and retreat in the radial direction, an elastic member accommodated in the pocket of the outer member, and for urging the piece member toward the inner diameter side; A switch spring mounted on the inner member and holding a phase with the cam ring at a predetermined position, by controlling the phase of the cam ring to match the pockets of the inner member and the outer member, Through
A two-way clutch, wherein power is transmitted by engaging the inner member and the outer member. 4. An inner member having an opening at an axial end face and having a plurality of pockets formed therein, an outer member externally fitted to the inner member and having an opening at an axial end face having a plurality of pockets formed therein, and a shaft. A cam wheel having a cam surface formed on an end surface in a direction, a piece member accommodated in the pocket of the inner member movably in the axial direction, and a component housed in the pocket of the inner member, for urging the piece member axially outward. An elastic member and a switch spring mounted on the inner member and holding the phase of the cam ring at a predetermined position. By controlling the phase of the cam ring, the pockets of the inner member and the outer member are formed. A two-way clutch, wherein the power is transmitted by making the inner member and the outer member engage with each other via the bridge member. 5. A case wherein a case is rotatably fitted to the outer member, a torque transmitting portion is provided between the outer member and the case, and a gap in a rotational direction is provided in the torque transmitting portion. A two-way clutch according to any one of claims 1 to 4. 6. The two-way clutch according to claim 5, wherein elastic members are provided at both ends in the rotation direction of said torque transmission unit. 7. The two-way clutch according to claim 1, wherein the number of pockets formed in each of the inner member and the outer member is different. 8. The two-way clutch according to claim 1, wherein the width of the pocket in which the piece member is stored is slightly smaller than the width of the other-side pocket.