JPH11336799A - Rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation transmission device making rotation of a holder of a two-way clutch smooth and precise movement and capable of carrying out certain change-over. SOLUTION: A two-way clutch A is constituted by forming a cylindrical surface 35 on one of facing surfaces of an outer ring 32 and an input shaft 33 and a plural number of cam surfaces forming a wedge space between the cylindrical surface 35 and themselves on the other, incorporating a roller 52 to be engaged with the above wedge space by relative rotation of the outer ring 32 and the input shaft 33 in a pocket of a holder 38 provided between these facing surfaces and incorporating a switch spring 45 to hold the roller 42 at a neutral position without engaging it between the holder 38 and the outer ring 32 or the input shaft 33, an armature 53 of an electromagnetic clutch B is installed on an end part of the holder 38 impossible to rotate with the holder 38 and free to move in the axial direction and the switch spring 45 is locked to the same end side of the end part of the holder 38 to which the armature 53 is fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmitting device used for switching between transmission and interruption of a driving force on a driving path of a vehicle.

[0002]

2. Description of the Related Art A four-wheel drive vehicle (hereinafter referred to as 4W) having front and rear wheels directly connected.
When the car (referred to as car D) turns on a tight corner of a pavement, a so-called tight corner braking phenomenon occurs, which causes a problem that the driver cannot turn as intended.

There is also a type using a center differential or a viscous fluid between the front and rear shafts of a 4WD vehicle. However, these 4WD vehicles restrain the front and rear wheels in some way and cause power circulation.
There is a problem that the controllability is poor because the rotational speed difference between the front and rear wheels hardly occurs and the rotational speed difference between the front and rear wheels is difficult to detect even when an ABS (anti-lock brake system) is mounted.

[0004] In order to solve these problems, the present applicant has proposed a rotation transmission device using a roller as an engagement element, for example, in Japanese Patent Application No. 8-141747.

As shown in FIG. 8, the rotation transmitting device 1 has a cylindrical surface 4 provided on the inner peripheral surface of the outer ring 2 between the outer ring 2 and an input shaft 3 (cam shaft) fitted thereto. Cylindrical surface 4
A cam surface 5 provided on the outer peripheral surface of the input shaft 3 so as to form a wedge space, a retainer 6 provided between the cylindrical surface 4 and the opposing surface of the cam surface 5, and a pocket 7 of the retainer 6. A two-way clutch 9, which is held and formed by a roller 8 engaged between the cylindrical surface 4 and the cam surface 5 by the relative rotation of the outer ring 2 and the input shaft 3, is provided. As shown in FIG. 9, a switch spring 10 for holding the roller 8 at a neutral position without engaging the roller 8 is incorporated between the shaft 3 and the retainer 6. When the roller 8 is at the neutral position, a gap a exists between the roller 8 and the outer ring 2.

[0006] As shown in FIG. 10, the switch spring 10 has a notch 1 provided in the input shaft 3 and the retainer 6.
Both ends are locked so that the phases of 1 and 12 are matched. An input ring 13 is attached to an end of the input shaft 3 via a sub-line.

On the other hand, an armature 14 is slidably fitted to the other end of the retainer 6 by serration or the like. An electromagnetic clutch 16 for pressing the armature 14 against the outer ring 2 using an electromagnet 15 is provided. Is formed.

[0008] As shown in FIG.
Between the front differential 17 of the R-based 4WD vehicle and the front propeller shaft 19 connecting the transmission and the transfer 18, or the FF-based 4WD of FIG.
For WD vehicles, viscous fluid type or gear type center differential 2
It is installed in the middle of the rear propeller shaft 22 connecting the 0 and the rear differential 21. In any case, the 4WD vehicle has an ABS, and the input ring 13 of the input shaft 3 is directly connected to the input side.
The outer ring 2 is directly connected to the output side.

In the rotation transmitting device 1, the electromagnet 1
5 can be freely controlled by controlling the current of the two-way clutch 9.
Can be switched between engagement and disconnection, and the above problem can be solved.

[0010]

By the way, in the rotation transmission device proposed above, the retainer 6 is supported and guided by the outer diameter surface of the input shaft 3, and the retainer 6 is provided with a ring-shaped spring by a switch spring. A notch 10 is engaged with a notch 12 on the opposite side of the locking end of the armature 14 so as to match the notch 11 provided on the input shaft 3.

If the roller 8 is in the neutral position,
As shown by arrows (A) and (B), the spring force F of the switch spring 10 acts symmetrically on the retainer 6 and matches the notch 11 with the input shaft 3 to maintain neutrality. No problem.

On the other hand, when the retainer 6 is disengaged from the neutral position by the frictional force acting on the armature 14 by the action of the electromagnetic clutch 16 and is slightly rotated, FIG.
As shown in (A) and (B), the spring force Fs of the switch spring 10 on the retainer 6 acts as a force acting in one direction on the outer peripheral point of the retainer 6, and the other end of the retainer 6 The force Fc of the armature 14 acts, and as a result, in addition to the moment M1 (intended torque) about the central axis, an unintended moment M about the axis perpendicular to the central axis acts on the retainer 6. In this case, apart from the torque for rotating the retainer around the axis, an eccentricity or a tilting force acts on the retainer, and the force is supported by the guide surface with the input shaft 3. The container 6 becomes difficult to rotate around the central axis due to the drag resistance of the guide portion.

As a result, there are disadvantages that the roller 8 does not move smoothly to the engagement position or does not return to the neutral position.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotation transmitting device which makes the rotation of a cage smooth and accurate, and which does not leak magnetic force.

[0015]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a cylindrical surface on one of the opposing surfaces of an outer ring and an inner member fitted therein, and the cylindrical surface on the other. A plurality of cam surfaces forming a wedge space between the outer ring and the pocket of the retainer provided between the opposing surfaces of the inner member and the outer ring;
A roller engaged between the cylindrical surface and the cam surface by the relative rotation of the outer ring and the inner member is incorporated, and the roller is held at a neutral position between the retainer and the outer ring or the inner member without engaging the roller. An elastic member is incorporated for mounting the armature at the end of the retainer so as to be non-rotatable and axially movable with the retainer, and between the outer ring and the inner member, the friction fixed to the inner member or the outer ring. In a rotation transmitting device incorporating a member and an electromagnet for attracting the armature, a configuration is employed in which the elastic member is locked on the same end as the end of a holder to which the armature is fitted.

According to a second aspect of the present invention, a cylindrical surface is formed on one of the opposing surfaces of the outer ring and the inner member fitted thereto, and a plurality of cam surfaces forming a wedge space between the cylindrical surface and the other are formed. A roller that engages between the cylindrical surface and the cam surface by the relative rotation of the outer ring and the inner member into a pocket of the retainer provided between the opposing surfaces of the outer ring and the inner member; Or, between the inner member, incorporate an elastic member for holding the roller in a neutral position without engaging the roller, and attach an armature to the end of the retainer so that it cannot rotate with the retainer and can move in the axial direction, A rotation transmission device incorporating a friction member fixed to the inner member or the outer ring and an electromagnet for attracting the armature between the outer ring and the inner member, wherein the armature has friction with a friction surface of the friction member; Fixed to the member Between the flange surface of the non-magnetic material,
This adopts a configuration of being sandwiched with a gap in the axial direction.

According to a third aspect of the present invention, in the first and second aspects of the present invention, the elastic member held at the neutral position is provided at an axial end of a cam surface and an axial end of a retainer, respectively. The structure adopts a configuration in which it is engaged with a notch of a width.

According to a fourth aspect of the present invention, in the first to third aspects, the elastic member is a ring spring having a C shape.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 4, the rotation transmission device 31 has an input shaft 33 rotatably housed via a bearing inside an outer ring 32 serving as a driven member. A two-way clutch A and an electromagnetic clutch B for engaging and disengaging the two-way clutch A are provided between the input shaft 33 and an input ring 34 attached to one end of the input shaft 33 via a spline.

In the two-way clutch A, a cylindrical surface 35 is formed on the inner diameter surface of the outer ring 32, and a plurality of the two-way clutches A are provided at predetermined intervals on the outer diameter surface of the large diameter portion 36 provided on the input shaft 33 so as to correspond thereto. Are formed, and each cam surface 37 is formed.
Defines a wedge-shaped space between the cylindrical surface 35 of the outer ring 32 and both sides in the circumferential direction having a narrow width.

A retainer 38 is externally inserted between the outer diameter surface of the large diameter portion 36 of the input shaft 33 and the cylindrical surface 35 of the outer ring 32,
Both ends of the retainer 38 are rotatably supported on the input shaft 33 via plates 39 and 40, respectively.

As shown in FIG. 2, the retainer 38 has the same number of pockets 41 as the cam surface 37 in the circumferential direction, and a roller 42 as an engaging element is incorporated in each pocket 41. The roller 42 is connected to each cam surface 37 of the input shaft 33.
, One for each, and the cage 3
When a predetermined amount is moved in the circumferential direction by 8, the outer ring 32 and the input shaft 33 are integrated with each other by engaging between the cam surface 37 and the cylindrical surface 35.

As shown in FIG. 3, the retainer 38 and the input shaft 3
Notches 3 and 44 are provided in both of the parts 3 in the circumferential direction, and a switch spring 45 as an elastic member is bent therein to set both ends. Notch portions 43, 44 of both
Is provided on a side surface adjacent to an armature described later.

When the notches 43 and 44 of the holder 38 and the input shaft 33 match each other, the positional relationship between the cam surface 37 of the input shaft 33 and the pocket 41 and the roller 42 of the holder 38 is as follows. The setting is made in the same manner as shown in FIG. 9, and a gap exists between the roller 42 and the outer ring 32. Therefore, when the switch spring 45 is set, the input shaft 3
3 and the outer ring 32 are not engaged, and the idle rotation is possible.

As shown in FIG. 1, the input shaft 33 and the outer ring 32
, An electromagnetic clutch B is incorporated. In the electromagnetic clutch B, a field core 49 for accommodating an electromagnetic coil 48 is fitted and fixed to a fixing portion 47 partly protruding outward from an end of the outer race 32, and is externally fitted to the field core 49 so as to be rotatable. Rotor 50 is press-fitted and fixed in a rotor guide 51 fitted in the outer race 32.
The rotor guide 51 is prevented from rotating with the outer race 32 by a pin 52.

Therefore, the field core 49 is a fixed member, and the outer ring 32, the rotor guide 51, and the rotor 50
Does not rotate at any time, and the rotor 50 is a friction member fixed to the outer race 32.

An armature 53, which is moved and attracted by the magnetic force of the electromagnetic coil 48, is interposed between the rotor 50 and the facing surface of the flange 51a of the rotor guide 51 fixed to the rotor 50 with a gap in the axial direction. The wave spring 54 provided between the armature 53 and the rotor 50 gently urges the armature 53 toward the surface of the flange 51 a of the rotor guide 51.

Here, the rotor guide 51 is made of a non-magnetic material such as aluminum or copper, so that not only the outer periphery of the rotor 50 but also the armature 53 comes into contact with the outer ring 32 so that the magnetic force does not leak to the outer ring 32. Is set to This is because if the magnetic force escapes to the outer ring 32, not only the intended attraction force of the armature 53 cannot be obtained, but also the attraction may not be possible.

As described above, by loosely fitting the armature 53 between the non-magnetic material and the friction surface of the rotor 50,
With these two parts, the movement amount of the armature 53 can be managed and adjusted, and the leakage of the magnetic force to the outer ring 32 can be prevented.

As shown in FIG. 1, the armature 53 is provided with a pair of protrusions 55 extending toward the retainer 38, and the protrusions 55 are used to cut the retainer 38 on which the switch spring 45 is installed. It is fitted in the same notch as the notch 44, and is not rotatable with respect to the retainer 38, but is movable in the axial direction.

That is, since the rotor 50 is connected to the outer ring 32 and the armature 53 is connected to the input shaft 33 via the retainer 38 and the switch spring 45, the relative rotation between the outer ring 32 and the input shaft 33 is possible. is there.

The rotation transmission device 31 according to the first embodiment has the above-described configuration. When no current flows to the electromagnetic coil 48, the two-way clutch A
5, the roller 42 is moved to the cam surface 37 as described above.
2 way clutch A
Is disengaged from the outer ring 32 and the input shaft 33, and the vehicle is in a two-wheel drive state.

On the other hand, when a current flows through the electromagnetic coil 48,
Due to the magnetic force of the electromagnetic coil 48, the armature 53 and the rotor 50 are pressed against each other. In this state, if the input shaft 33 and the outer ring 32 attempt to idle relative to each other, the armature 53 and the rotor 5
0, the retainer 38 and the outer ring 32
Roller 42 moves from the neutral position of the cam surface 37 to the engagement position of the wedge space, and the two-way clutch A
Engages the outer ring 32 and the input shaft 33 (cam), and is in a four-wheel drive state.

Therefore, when the electromagnetic coil 48 is turned on, the outer ring 32 and the input shaft 33 can be locked. At this time, the roller 42 moves to the engagement position. As shown in FIG. 4, the one-way force Fs acting on the holder 38 by the switch spring 45 is changed in the axial direction with respect to the moment Fc acting from the armature 53. , And no moment acts on the retainer 38 about an axis perpendicular to the central axis. For this reason, the retainer 38 can rotate smoothly with respect to the input shaft 33, and it is not particularly necessary to use a bearing or the like. Also,
As described above, by using the notch for locking the switch spring 45 and the notch for engaging the protrusion 55 of the armature 53 in common, the number of processing steps can be reduced and the cost can be reduced.

FIGS. 5 to 7 show the second example of the rotation transmitting device 31.
Is shown. In the second embodiment, a cam surface 37 is provided on the inner diameter surface of the outer ring 32, and the outer diameter surface of the large diameter portion 36 of the input shaft 33 is a cylindrical surface 35.

Also in the second embodiment, the switch spring 45 is provided at the end of the retainer 38 on the armature 53 side, and the outer ring 32 and the notch 4 of the retainer 38 are provided.
Acts to match 3,44. In addition, although the ring-shaped switch spring 45 is used for the notch portions 43 and 44 as the elastic member, an elastic member such as a coil spring or a plate spring is incorporated in the notch portions 43 and 44, and the same as in both embodiments. Alternatively, the phases of the notches 43 and 44 may be supported.

The rotation transmission device 31 shown in both embodiments is, of course, used for other applications as well as the applications shown in the conventional example.
The present invention can be widely applied to applications for switching between transmission and interruption of driving force.

[0038]

As described above, according to the present invention, the position at which the switch spring is locked to the retainer is set to the same end as the end at which the armature is engaged with the retainer. Acts only on the retainer as a moment about the central axis, and no unintended drag force is generated. Therefore, the retainer can smoothly rotate with respect to the cam without being particularly supported by the bearing. Moreover, by using the same common locking portion,
It can reduce the man-hour and man-hour of the cage,
Cost can be reduced.

Further, by loosely fitting the armature between the rotor guide made of a non-magnetic material fixed to the rotor and the friction flange surface of the rotor, it is possible to prevent the magnetic force from leaking from the rotor and the armature to the outside. The suction power can be increased.

Furthermore, the amount of movement (gap) of the armature can be managed and adjusted at the sub-assembly stage, which is convenient for assembly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a rotation transmission device.

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

FIG. 3 is a sectional view taken along arrows III-III in FIG.

FIG. 4A is a cross-sectional view showing the action of a moment by a switch spring on a retainer, and FIG. 4B is a perspective view of the same.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the rotation transmitting device.

FIG. 6 is a sectional view taken along arrows VI-VI in FIG.

FIG. 7 is a sectional view taken along arrows VII-VII in FIG. 5;

FIG. 8 is a longitudinal sectional view showing a conventional rotation transmission device.

FIG. 9 is an enlarged sectional view taken along arrow IX-IX in FIG.

FIG. 10 is a sectional view taken along arrows XX in FIG. 8;

FIG. 11A is a cross-sectional view showing the action of a moment during two-wheel drive by a switch spring on a retainer in a conventional rotation transmission device, and FIG. 11B is a perspective view of the same.

FIG. 12A is a cross-sectional view showing the action of a moment during four-wheel drive by a switch spring on a retainer in a conventional rotation transmission device, and FIG. 12B is a perspective view of the same.

FIG. 13 is a plan view showing a mounting example of the rotation transmitting device.

FIG. 14 is another plan view showing a mounting example of the rotation transmitting device.

[Explanation of symbols]

 Reference Signs List 31 rotation transmission device 32 outer ring 33 input shaft 35 cylindrical surface 37 cam surface 38 retainer 42 roller 43, 44 cutout portion 45 switch spring 48 electromagnetic coil 50 rotor 51 rotor guide 53 armature 55 protrusion A 2 way clutch B electromagnetic clutch

Claims (4)

[Claims] 1. A cylindrical surface is formed on one of opposing surfaces of an outer ring and an inner member fitted therein, and a plurality of cam surfaces forming a wedge space between the cylindrical surface and the other are formed on the other surface. A roller engaged between the cylindrical surface and the cam surface by the relative rotation of the outer ring and the inner member is incorporated in a pocket of the retainer provided between the opposing surfaces of the two members, and the retainer and the outer ring or the inner member are In between, incorporate an elastic member for holding the roller in a neutral position without engaging the roller, and attach an armature to the end of the retainer so as to be non-rotatable and axially movable with the retainer,
Between the outer ring and the inner member, in a rotation transmission device incorporating an electromagnet for attracting the armature and a friction member fixed to the inner member or the outer ring, an end of a retainer to which the armature fits. A rotation transmitting device, wherein the elastic member is locked at the same end. 2. A cylindrical surface is formed on one of opposing surfaces of an outer ring and an inner member fitted therein, and a plurality of cam surfaces forming a wedge space between the cylindrical surface and the other are formed on the other surface. A roller engaged between the cylindrical surface and the cam surface by the relative rotation of the outer ring and the inner member is incorporated in a pocket of the retainer provided between the opposing surfaces of the two members, and the retainer and the outer ring or the inner member are In between, incorporate an elastic member for holding the roller in a neutral position without engaging the roller, and attach an armature to the end of the retainer so as to be non-rotatable and axially movable with the retainer,
A rotation transmission device incorporating a friction member fixed to the inner member or the outer ring and an electromagnet for attracting the armature between the outer ring and the inner member, wherein the armature has friction with a friction surface of the friction member; A rotation transmission device characterized in that the rotation transmission device is sandwiched with a gap in an axial direction between the nonmagnetic member and a flange surface fixed to a member. 3. The elastic member held at the neutral position is engaged with notches having the same width provided at an axial end of the cam surface and an axial end of the retainer, respectively. Item 3. The rotation transmitting device according to Item 1 or 2. 4. The rotation transmission device according to claim 1, wherein the elastic member is a ring spring having a C shape.