JP2003301865A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitting device with a two-way clutch prevented from being in an engaging condition during the idling of an inward member. <P>SOLUTION: A roller 6 is assembled between a cylindrical face 3 of an outer ring 2 and a cam face 5 of a cam ring 4. Between a two-way clutch 1 using a holder 7 for holding the roller 6 and an electromagnet 20 for controlling the engagement of the two-way clutch, a rotor 30 prevented from being rotated by the outer ring 2, an armature 40 prevented from being rotated relative to the holder 7 and supported movably in the axial direction and a departing spring 43 for thrusting the armature 40 in the direction of departure from the rotor 30 are assembled. A rotation preventing mechanism 50 is assembled between the cam ring 4 and the armature 40. When the cam ring 4 and the armature 40 are relatively rotated by preset angled during the idling of the cam ring 4, the rotation preventing mechanism 50 is operated for preventing the armature from being rotated relative to the cam ring 4 to prevent the roller 6 from engaging with the cylindrical face 3 and the cam face 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission used for transmitting or shutting off driving torque from an engine to driven wheels of a part-time four-wheel drive vehicle during two-wheel drive. It relates to the device.

[0002]

2. Description of the Related Art In a FR-based four-wheel drive vehicle, a rotation transmission device shown in FIG. 6 is conventionally known as a rotation transmission device for transmitting or cutting off drive torque from an engine to front wheels.

The rotation transmission device has a roller type two-way clutch 1'and an electromagnet 20 'for controlling engagement of the two-way clutch 1'.

In the two-way clutch 1 ', a cylindrical surface 3'is formed on the inner circumference of the outer ring 2', and on the outer circumference of a cam ring 4'as an inner member incorporated therein, between the cylindrical surface 3'and the cylindrical surface 3 '. A plurality of cam surfaces 5'that form a wedge-shaped space are provided, a roller 6'is incorporated between the cylindrical surface 3'and the cam surface 5 ', and a retainer 7'holding the roller 6'and a cam ring 4'. Incorporating a switch spring 9'between, which biases the cage 7'towards a neutral position in which the roller 6'is disengaged from the cylindrical surface 3'and the cam surface 5 '. ing.

The electromagnet 20 'is incorporated in the end portion of the outer ring 2', and between the facing portion of the electromagnet 20 'and the cage 7',
The rotor 30 'made of a magnetic material that is non-rotating with respect to the outer ring 2', the armature 40 'that is non-rotating with respect to the cage 7'and is movably supported in the axial direction, and the armature 40'. A separation spring 43 'that presses in a direction away from the rotor 30' is incorporated.

The rotation transmission device having the above structure is used, for example, to transmit or cut off drive torque from the engine to the front wheels of an FR-based four-wheel drive vehicle. In such a use, the cam ring 4'is fitted to the main shaft 60 'for driving the rear wheels to prevent the rotation, and the rolling bearing 61' is incorporated between the rotor 30 'and the main shaft 60' to install the rotor 30 '. 'Is rotatably supported.

In the use of the rotation transmission device as described above, when the rotation speed of the rear wheels exceeds the rotation speed of the front wheels,
When the electromagnetic coil 20b 'of the electromagnet 20' is energized, the armature 40 'is attracted to the rotor 30' and the cage 7'is retained.
Is prevented from rotating with respect to the outer ring 2 ', and the roller 6'is rotated by the relative rotation of the retainer 7'and the cam ring 4'.
And the cam surface 5 '. Due to the engagement, the torque of the cam ring 4'is transmitted to the outer wheel 2 ', and the torque of the outer wheel 2'is transmitted to the front wheels to switch from two-wheel drive to four-wheel drive.

Also, the electromagnetic coil 20b 'of the electromagnet 20' is
When the energization is cut off, the armature 40 'separates from the rotor 30' due to the pressing of the separation spring 43, and when the rotation speed of the outer ring 2'exceeds the rotation speed of the cam ring 4'in the separated state, the roller 6'will move to the cylindrical surface. It is returned to the neutral position where it is disengaged from 3'and the cam surface 5 ', and is held in the neutral position by the elasticity of the switch spring 9'. Therefore, the rotation transmission from the cam ring 4'to the outer ring 2'is interrupted, and the four-wheel drive mode is changed to the two-wheel drive mode.

[0009]

By the way, in the conventional rotation transmitting device shown in FIG. 6, the outer ring 2'is stopped and the cam ring 4'is arranged with the roller 6'in the neutral position.
When the roller is rotated at a high speed, the cage 7 ′ rotates together with the cam ring 4 ′, so that the roller 6 ′ moves outward due to the centrifugal force and comes into contact with the cylindrical surface 3 ′ of the outer ring 2 ′ that is in a stopped state. Rotate. Therefore, the cam ring 4'is given a torque that hinders its rotation, so-called drag torque,
When the drag torque exceeds the elastic force of the switch spring 9 ′, the cam ring 4 ′ and the retainer 7 ′ rotate relative to each other,
The roller 6'engages the cylindrical surface 3'and the cam surface 5 ',
The torque of the cam ring 4'may be transmitted to the outer ring 2 '.

As a measure for preventing the occurrence of such inconvenience, as shown in FIG. 7, the protrusion 5 is provided on the armature 40 '.
1'is provided, and the protrusion 51 'is fitted to the notch 52' formed in the cam ring 4'to prevent the armature 40 'from rotating on the cam ring 4', but in this case, the electromagnet 20 When the'adsorbs the armature 40 ', it is necessary to move the armature 40' in the axial direction to the position where the protrusion 51 'comes off the notch 52'.
It becomes necessary to secure a large axial clearance 44 'between the armature 40' and the rotor 30 ', which causes a problem of requiring a large electromagnet 20' having a large capacity.

Also, the armature 40 'and the rotor 30'.
By increasing the axial clearance 44 'formed therebetween, the response time from the start of energization of the electromagnetic coil 20' to the engagement of the roller 6'becomes longer, and the outer ring 2 '
The difference in rotational speed between the cam ring 4'and the cam ring 4'becomes large, and an engagement shock may occur when the roller 6'is engaged.

An object of the present invention is to prevent the roller from being displaced to the engagement position by the drag torque when the inner member composed of the cam ring idles in the rotation transmitting device as described above.

Another object of the present invention is to enable the two-way clutch roller to be engaged without causing an engagement shock, and to control the engagement of the two-way clutch by a small electromagnet having a small capacity. .

[0014]

In order to solve the above problems, the present invention has a roller type two-way clutch and an electromagnet for controlling the engagement of the two-way clutch, and the two-way clutch is a cylinder. An outer ring having a surface on the inner circumference, an inner member having a cam surface on the outer circumference forming a wedge-shaped space between the cylindrical surface, a roller incorporated between the cylindrical surface and the cam surface, and holding the roller And a switch spring that is installed between the retainer and the inner member and biases the retainer toward a neutral position where the roller is disengaged from the cylindrical surface and the cam surface. A rotor fixed to the outer ring between the retainer and the electromagnet of the two-way clutch, and an armature fixed to the retainer and movably supported in the axial direction. In the rotation transmitting device incorporating a separating spring for pressing in the direction away the armature from the rotor, between each other the inner member and the armature,
When the inner member and the armature rotate relative to each other within a predetermined angle within which the roller is displaced from the neutral position to the engaging position where the roller engages with the cylindrical surface and the cam surface, the armature is prevented from rotating on the inner member. The structure is provided with a rotation stopping means.

With the above construction, when the inner member is idling, the cam ring and the retainer rotate relative to each other due to the drag torque, and when the rotation angle reaches a predetermined angle, the detent means operates to hold the retainer. An armature that rotates integrally with the container is stopped by the inner member. The detent prevents the inner member and the retainer from rotating together and prevents the roller from being displaced to the engagement position by the drag torque.

Here, as the rotation preventing means, a protrusion provided on one of the facing surfaces of the inner member and the armature and an engaging concave portion provided on the other surface are provided, and the armature is attached to the protrusion from the inner member. It is possible to employ a structure having a tapered surface that is pressed by the edge of the opening of the engaging concave portion when rotating rapidly.

In the detent means having the above structure, the protrusion and the engaging recess are displaced in the circumferential direction while the roller is held at the neutral position, and the protrusion is in contact with the end face of the inner member. Therefore, the axial clearance formed between the facing surfaces of the armature and the rotor can be set to a small value regardless of the engagement depth of the protrusion and the engaging recess. Therefore, the armature can be attracted by a small electromagnet with a small capacity, and the time from when the electromagnetic coil of the electromagnet is energized until the roller is engaged is shortened, and the responsiveness of the two-way clutch is improved. It is possible to prevent an engagement shock from being generated at the time of engagement.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the rotation transmission device includes a roller type two-way clutch 1 and an electromagnetic clutch 20 for controlling the engagement of the two-way clutch 1 as in the rotation transmission device shown in FIG. There is.

The two-way clutch 1 is provided with a cylindrical surface 3 on the inner periphery of the outer ring 2, and a wedge-shaped space is formed between the outer peripheral surface of the cam ring 4 as an inner member incorporated inside the outer ring 2 and the cylindrical surface 3. A plurality of flat cam surfaces 5 to be formed are formed, and a roller 6 incorporated between each cam surface 5 and the cylindrical surface 3 is attached to a cage 7.
Holding in.

A circular recess 8 is formed on the end surface of the cam ring 4.
A ring portion 9a provided on the switch spring 9 is fitted in the recess 8 and a pair of outwardly facing engaging pieces 9b provided at both ends of the ring portion 9a are formed on the peripheral wall of the recess 8. The formed window 10 is inserted into the notch 11 provided at the end of the retainer 7, and the side surface of the notch 11 that is pressed in the circumferential direction is pressed, whereby the roller 6 causes the roller 6 and the cam surface to move. The retainer 7 is biased toward the neutral position where it is disengaged from the surface 5.

The electromagnetic clutch 20 is incorporated in the end portion of the outer ring 2 and faces the retainer 7 in the axial direction. The electromagnetic clutch 20 has a structure in which an electromagnetic coil 20b is wound around a core 20a, and a rotor 30 made of a magnetic material and an armature 40 also made of a magnetic material are incorporated between the electromagnetic clutch 20 and the opposite end of the cage 7. Has been.

The rotor 30 includes an outer cylinder portion 30a and an inner cylinder portion 3
0b, the outer cylinder portion 30a is fitted in a rotor guide 31 incorporated in the end portion of the outer ring 2, and is retained by a retaining ring 32 attached to the inner circumference of the end portion of the outer ring 2. In addition, the outer tubular portion 30a has an end portion on which the protruding piece 3 that faces the outer diameter direction.
0c, and the protruding piece 30c is fitted in the notch 33 formed in the end portion of the outer ring 2, and the rotor 3 is fitted by the fitting.
0 is stopped by the outer ring 2.

The armature 40 has a plurality of engaging holes 41, and the detent piece 42 formed at the end portion of the retainer 7 is inserted into each engaging hole 41, and the armature 4 is inserted by the insertion.
0 is not rotated with respect to the cage 7 and is movable in the axial direction.

The armature 40 is pressed in a direction away from the rotor 30 by a separation spring 43 incorporated between the armature 40 and the rotor 30.

Between the facing portions of the armature 40 and the cam ring 4, when the cam ring 4 and the retainer 7 rotate relatively, a rotation stopping mechanism for preventing the armature 40 rotating integrally with the retainer 7 from rotating on the cam ring 4. 50 are provided.

As shown in FIGS. 3 to 5, the anti-rotation mechanism 50 has a plurality of protrusions 51 provided on one side surface of the armature 40 facing the retainer 7 and an engagement member formed on the end surface of the cam ring 4. And a mating recess 52.

The protrusion 51 and the engaging recess 52 are displaced in the circumferential direction when the roller 6 is held at the neutral position,
When the cam ring 4 and the retainer 7 rotate relative to each other by a predetermined angle, the armature 40 is moved in the axial direction by the pressing of the separation spring 43 at the position where the projection 51 and the engaging recess 52 face each other in the axial direction, and the engaging recess is formed. The projection 51 is engaged with 52, and the retainer 7 is prevented from rotating by the cam ring 4 by the engagement.

Here, the phase shift between the protrusion 51 and the engagement recess 52 when the roller 6 is held at the neutral position is until the roller 6 is engaged with the cylindrical surface 3 and the cam surface 5 from the neutral position. The angle is smaller than the angle, and the roller 6 is arranged at a position where it is not engaged with the cylindrical surface 3 and the cam surface 5 in a state where the protrusion 51 is engaged with the engaging recess 52.

The projection 51 has a taper surface 51a at one end, and when the rotation speed of the cam ring 4 decreases and the drag torque decreases when the projection 51 engages with the engagement recess 52, the switch spring 9 causes The roller 6 rotates so as to be in the neutral position. At this time, the tapered surface 51a is pushed by the edge 52a of the opening of the engaging recess 52,
The engagement between the projection 51 and the projection 51 is released.

Incidentally, the projection 51 is formed on the cam ring 4,
The engagement recess 52 may be formed in the armature 40. In this case, the tapered surface 51a is formed on the other end of the protrusion 51.

The rotation transmission device shown in the embodiment has the above structure, and FIG. 1 shows a state in which the rotation transmission device is incorporated on the main shaft 60 which drives the rear wheels of an FR-based four-wheel drive vehicle. The cam ring 4 is fitted on the main shaft 60 and is prevented from rotating on the main shaft 60 by a spline or the like. In addition, the rotor 30 is the main shaft 60.
It is rotatably supported by a bearing 61 incorporated between and.

When the main shaft 60 is rotated by depressing the accelerator pedal while the four-wheel drive vehicle is mounted on the four-wheel drive vehicle as described above, the cam ring 4 rotates together with the cam ring 4. Is transmitted to the retainer 7 via the switch spring 9, and the retainer 7 also rotates. Further, since the rotation of the retainer 7 is transmitted to the armature 40 via the detent piece 42, the armature 40 also rotates together.

When the rotation speed of the cam ring 4 is low, the centrifugal force acting on the roller 6 is small. Therefore, the contact pressure of the roller 6 against the cylindrical surface 3 of the outer ring 1 is small, and the cage 7
Since the drag torque applied to the switch spring 9 is also small, the switch spring 9 is not elastically deformed.

Therefore, the roller 6 rotates while being held in the neutral position, and the cam ring 4 and the armature 40 engage with the protrusion 51 as shown in FIGS. 4 (I) and (II). The recesses 52 rotate together with their positions displaced in the circumferential direction.

In a stopped state of the outer ring 1, that is, in a so-called two-wheel drive state,
When the cam ring 4 is rotated at a high speed, the centrifugal force acting on the roller 6 becomes large, so that the roller 6 comes into strong contact with the cylindrical surface 3 and the drag torque applied to the cage 7 increases. When the drag torque becomes stronger than the elastic force of the switch spring 9, the switch spring 9 elastically deforms and the cam ring 4 relatively rotates in the forward direction with respect to the retainer 7 and the armature 40.

When the cam ring 4 relatively rotates with respect to the armature 40 to the position where the engaging recessed portion 52 faces the protrusion 51, the armature 40 moves toward the cam ring 4 due to the pressing force of the separation spring 43, as shown in FIG. As shown in (II), the protrusion 51 engages with the engagement recess 52. Due to the engagement, the armature 40 is prevented from rotating by the cam ring 4, and the armature 40 is prevented from rotating with respect to the retainer 7, so that the retainer 7 rotates together with the cam ring 4 and is prevented from rotating relatively.

Therefore, the roller 6 does not engage with the cylindrical surface 3 and the cam surface 5 and idles while maintaining the disengaged state, and the roller 6 is brought into the engaged state by the drag torque. Can be prevented.

As shown in FIG. 5, the protrusion 51 and the engaging recess 5
When the rotation speed of the cam ring 4 is reduced while the cam ring 4 and the armature 2 are engaged, the elastic force of the switch spring 9 and the armature 4
The inertial force applied to the armature 40 causes the armature 40 to relatively rotate in the forward direction with respect to the cam ring 4, and the relative rotation pushes the tapered surface 51a of the protrusion 51 at the edge 52a of the opening of the engaging recess 52, thereby allowing the armature to move. 40 moves in a direction away from the cam ring 4. By the movement, the protrusion 51 is disengaged from the engaging recess 52, and the switch spring 9
By the roller 6 being returned to the neutral position by the above, the projection 51 is returned to the state where it is displaced in the circumferential direction from the engaging recess 52, as shown in FIG. 4 (II).

At this time, the rotor 30 and the armature 40
The axial clearance 44 formed between the opposing surfaces of the armature 40 has a small value, and the armature 40 can be reliably attracted by the rotor 30 by energizing the electromagnetic coil 20b of the electromagnet 20.

Here, the axial clearance 44 is defined by the protrusion 51.
Can be set to a small value irrespective of the meshing depth of the engaging concave portion 52 and the engaging concave portion 52, and the projection 51 and the engaging concave portion 52 do not affect the engagement of the two-way clutch 1. The engagement of the two-way clutch 1 can be controlled by 20.

[0041]

As described above, according to the present invention, when the inner member idles, dragging torque is applied to the retainer by the contact rotation of the roller with the cylindrical surface of the outer ring in a stopped state, and the inner member is retained. When the device rotates relative to the retainer, the detent mechanism is activated to prevent the armature rotating integrally with the retainer from being rotated by the inner member, so that the drag torque prevents the roller from engaging the cylindrical surface and the cam surface. Can be prevented.

Further, as the rotation preventing means, a protrusion is provided on one of the facing surfaces of the inner member and the armature, and an engaging concave portion is formed on the other surface, and the protrusion is formed when the inner member is rotated relative to the armature by a predetermined angle. Since the armature is engaged with the engaging recess to prevent the armature from rotating with respect to the inner member, the axial clearance formed between the facing surfaces of the armature and the rotor is set to the engagement depth of the protrusion and the engaging recess. It can be set to a small value regardless. Therefore, the engagement of the two-way clutch can be controlled by a small electromagnet having a small capacity.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing an embodiment of a rotation transmission device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view showing an inner member and an armature of the rotation transmission device shown in FIG.

4 (I) is an enlarged cross-sectional view showing a portion of the rotation stopping mechanism of the rotation transmission device shown in FIG. 1, and (II) is a cross-sectional plane view showing the relationship between the engagement recess of the inner member and the armature protrusion. Figure

5 (I) is a cross-sectional view showing an operating state of the rotation stopping mechanism shown in FIG. 4 (I), and (II) is a cross-sectional plan view thereof.

FIG. 6 is a vertical sectional front view showing a conventional rotation transmission device.

FIG. 7 is a cross-sectional view showing an example of countermeasures for preventing the roller from being brought into an engaged state due to a drag torque.

[Explanation of symbols]

1 two-way clutch 2 outer ring 3 Cylindrical surface 4 Cam ring (inner member) 5 Cam surface 6 roller 7 cage 9 Switch spring 20 electromagnets 30 rotor 40 Armature 43 Separation spring 50 Anti-rotation mechanism (anti-rotation means) 51 protrusions 52 engagement recess

Claims (2)

[Claims] 1. A roller-type two-way clutch, and an electromagnet for controlling engagement of the two-way clutch, wherein the two-way clutch has a wedge-shaped space between an outer ring having a cylindrical surface on an inner circumference and the cylindrical surface. An inner member having a cam surface on the outer periphery, a roller incorporated between the cylindrical surface and the cam surface, a retainer for holding the roller, and an inter-member incorporated between the retainer and the inner member. , A switch spring for urging the retainer toward a neutral position where the roller is disengaged from the cylindrical surface and the cam surface, and the roller is provided between the retainer of the two-way clutch and the electromagnet with respect to the outer ring. A rotor that is prevented from rotating, an armature that is prevented from rotating with respect to the cage and that is supported so as to be movable in the axial direction, and a separation spring that presses the armature in a direction that separates the armature from the rotor. In the rotation transmission device embedded,
Between the inner member and the armature, the inner member and the armature rotate relatively to each other within a predetermined angle within which the roller is displaced from the neutral position to the engagement position for engaging the cylindrical surface and the cam surface. A rotation transmission device, which is provided with a rotation stopping means for stopping rotation of the armature to the inner member at the time. 2. The detent means comprises a protrusion provided on one of the facing surfaces of the inner member and the armature, and an engaging recess provided on the other, and the armature is provided on the protrusion more than the inner member. The rotation transmission device according to claim 1, wherein the rotation transmission device is provided with a tapered surface that is pressed by an edge of an opening of the engagement recess when the rotation is fast.