JPH1053044A - Rotation transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate occurrence of power circulation at the time of brake application by installing a rotation transmitting device according to the invention on a drive route of a four-wheel driving vehicle and conducting the transmission of the drive force and shut-off of the driving force at braking. SOLUTION: A cylindrical surface 6 and cam surface 7 are furnished to form a wedge-shaped space between the opposing surfaces of the outer ring 2 and input shaft 4, and rollers 10 are set in a pocket of a retainer 8 installed between them, and an electromagnetic clutch 14 is coupled with the retainer 8, and a switch spring 13 is installed between the retainer 8 and input shaft 4. When the current being fed to the coil 16 of the clutch 14 is shut off with an ABS operation signal in the four-wheel drive traveling condition, the coupling between the outer ring 2 and input shaft 4 is disengaged to generate a two-wheel drive traveling condition, which precludes occurrence of the power circulation.

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 Present four-wheel drive vehicles (hereinafter referred to as 4WD).
Has a center differential between its front and rear shafts. This center differential has a bevel gear type and a planetary gear type,
A viscous fluid type is used, but the combination of such a center differential and an anti-lock brake system (hereinafter referred to as ABS) that improves braking force and operation stability during braking restrains the front and rear wheels. It is said that since power circulation occurs, matching is poor in terms of the controllability of the ABS and the inter-wheel rotation restraining force of the drive system.

As a method for solving such a problem, the present applicant has proposed an ABS-rotation transmission device (hereinafter, may be referred to as an MCU) using a roller as an engaging element, and a FF-based 4WD.
Japanese Patent Application No. 5-137736 has proposed a device mounted on a rear propeller shaft of No. 5 to prevent power circulation between a front wheel and a rear wheel during an ABS operation (during braking).

[0004]

By the way, the above ABS
-Since the MCU has a one-way clutch in the rotation direction, it transmits power in the drive direction but does not transmit the braking direction. Therefore, when this is used, the engine is provided to the sub-drive wheels (rear wheels) or all four wheels. There is a phenomenon that the brake is not applied, leaving room for improvement.

Accordingly, an object of the present invention is to prevent the power circulation by using an electromagnetic clutch and a mechanical clutch and electrically controlling the lock and free control.
By mounting on a drive path of a WD vehicle, transmission and cutoff of driving force can be switched by an electromagnetic clutch. When 4WD is unnecessary on a pavement road or the like, it can be easily switched to 2WD to improve fuel efficiency. An object of the present invention is to provide a rotation transmission device capable of preventing deterioration of a fluid coupling and reducing wear of a tire.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 comprises a shaft having a cam surface, a retainer, an outer ring, and a roller, and a notch is formed in the shaft and the retainer. When the notches match, the phase between the cam surface of the shaft and the pocket of the retainer is adjusted so that the roller serving as the engaging element moves between the outer ring and the shaft. In a rotation transmission device that is fixed at a position with a gap between the shaft and the outer ring so that the shaft and the outer ring can freely rotate in both directions with each other, in order to engage the shaft and the outer ring with rollers, In order to integrate the cage, a pressing force is generated by attracting an amateur to the friction member fixed to the outer ring using the magnetic force of the electromagnet,
The outer ring and the retainer are integrated by the frictional force.

According to a second aspect of the present invention, a shaft having a cam surface, a retainer, an outer ring, and a roller are provided, and a notch is provided on the shaft and the retainer, and an applying force is applied by an elastic member so that the notches coincide with each other. When the notches match, the phase of the cam surface of the shaft and the phase of the pocket of the retainer are set so that the roller as the engaging element is fixed at a position having a gap between the outer ring and the shaft, In the rotation transmission device that allows the outer ring to freely rotate in both directions with each other, an elastic member is used in advance to
The retainer is pressed against the outer ring to be integrated, and the armature is attracted using the magnetic force of the electromagnet, so that the pressing force is eliminated and the outer ring and the retainer are rotatable.

According to a third aspect of the present invention, there is provided an outer race having a cam surface,
A notch is provided between the outer ring and the retainer, and a force is applied by an elastic member so that the notch matches, and when the notch matches, the cam surface of the outer ring and the retainer are provided. A rotation transmission device in which the phase of the pocket is fixed such that the roller serving as the engagement element has a gap between the outer ring and the shaft, and the outer ring and the shaft can freely rotate in both directions. In order to engage the outer ring and the shaft by a roller, in order to integrate the shaft and the retainer, a pressing force is generated by attracting an armature using a magnetic force of an electromagnet to a friction member fixed to the shaft. The shaft and the retainer are integrated by the frictional force.

According to a fourth aspect of the present invention, there is provided an outer race having a cam surface,
A notch is provided between the outer ring and the retainer, and a force is applied by an elastic member so that the notch matches, and when the notch matches, the cam surface of the outer ring and the retainer are provided. A rotation transmission device in which the phase of the pocket is fixed such that the roller serving as the engagement element has a gap between the outer ring and the shaft, and the outer ring and the shaft can freely rotate in both directions. , The retainer is pressed against the shaft by an elastic member in advance, and the armature is attracted by using the magnetic force of the electromagnet, thereby eliminating the pressing force and allowing the shaft and the retainer to rotate. It is.

[0010] A fifth aspect of the present invention is the invention according to the first or third aspect, wherein an elastic member is provided for pressing the armature against the friction member.

A sixth aspect of the present invention, in any one of the first, second, and fifth aspects, employs a configuration in which the outer diameter side of the friction member is covered with a member made of a non-magnetic material.

A seventh aspect of the present invention is the invention according to any one of the third, fourth, and fifth aspects, wherein the friction member has an inner diameter side covered with a member made of a non-magnetic material.

The invention according to claim 8 is the invention according to claims 1, 3, 5,
In any one of the sixth and seventh inventions, the rotation transmission device may be an FF
It is located on the rear propeller shaft of a full-time four-wheel drive vehicle with ABS as the base or on the front wheel propulsion shaft of the full-time four-wheel drive vehicle with ABS based on FR and RR. Based on the signal when the ABS is activated, A configuration is adopted in which the two-wheel drive state is set by turning off the electromagnetic clutch to easily detect the lock tire.

[0014] The ninth aspect of the present invention is the second aspect of the present invention.
In any one of the sixth and seventh inventions, the rotation transmission device may be an FF
It is located on the rear propeller shaft of a full-time four-wheel drive vehicle with ABS as the base or on the front wheel propulsion shaft of the full-time four-wheel drive vehicle with ABS based on FR and RR. Based on the signal when the ABS is activated, By turning on the electromagnetic clutch, a two-wheel drive state is established, and a configuration is adopted that facilitates detection of the lock tire.

According to a tenth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the rotation transmitting device is connected in series with an operation limiting mechanism on a driven wheel drive path of a four-wheel drive vehicle. This is a configuration in which the components are arranged in such a manner.

According to an eleventh aspect of the present invention, in the invention of the tenth aspect, the on / off switch provided in the vehicle is used to manually switch on and off the current to the electromagnet of the rotation transmitting device.

According to a twelfth aspect of the present invention, in the tenth aspect of the present invention, in the rotation transmission device according to the tenth aspect, the current to the electromagnet of the rotation transmission device is a difference between the rotational speeds of the front and rear wheels or an acceleration sensor. For example, a configuration in which a signal is output when slippage of the main drive wheel is detected in the above manner is adopted.

[0018]

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

In the first embodiment shown in FIGS. 1 to 5, in a rotation transmitting device 1, an input shaft 4 is rotatably housed via a bearing 3 inside an outer ring 2 which is a driven member. The input ring 5 is attached to the end of the input ring 4 via a spline.

A cylindrical surface 6 is formed on the inner diameter surface of the outer ring 2, and a plurality of flat cam surfaces 7 are provided at predetermined intervals on the outer diameter surface of the large diameter portion provided on the input shaft 4 so as to correspond thereto. Each cam surface 7 forms a wedge-shaped space between the cylindrical surface 6 of the outer race 2 and the cylindrical surface 6 so that both sides in the circumferential direction are narrow.

An annular retainer 8 is externally inserted into the large-diameter portion of the input shaft 4, and the retainer 8 is formed with the same number of pockets 9 as the cam surface 7 in the circumferential direction. A roller 10 as an engaging element is incorporated. Roller 10
Are mounted one by one with respect to each cam surface 7 of the input shaft 4, and when they are moved by a predetermined amount in the circumferential direction by the retainer 8, they engage between the cam surface 7 and the cylindrical surface 6, and And the input shaft 4 are integrated.

As shown in FIG. 3, both the retainer 8 and the input shaft 4 have notches 11 and 12 in a part of the circumferential direction.
The switch spring 13 as an elastic member is deflected there to set both ends.

The retainer 8 and the input shaft 4 are notched 1
1 and 12, the positional relationship between the cam surface 7 of the input shaft 4 and the pocket 9 and the roller 10 of the retainer 8 is as shown in FIG.
And a gap a exists between the roller 10 and the outer ring 2. Therefore, when the switch spring 13 is set, the input shaft 4 and the outer ring 2 are not engaged, and the operation enters the neutral standby mode.

As shown in FIG. 1, an electromagnetic clutch 14 is incorporated between the input shaft 4 and the outer ring 2. The electromagnetic clutch 14 presses, in a non-rotatable manner, a field core 17 that houses the coil 16 into a fixing portion 15 that partially protrudes outward from an end of the outer race 2, and is externally fitted to the field core 17 so as to be rotatable. The rotating rotor 18 is non-rotatably press-fitted into a non-magnetic rotor guide 19, and the rotor guide 19 is stopped from rotating with the outer race 2 by a pin 20.

Therefore, the field core 17 is a fixed member, and the outer race 2, the rotor guide 19, and the rotor 18 do not rotate relative to each other at any time, and the rotor 18 is a friction member fixed to the outer race 2.

As shown in FIG. 4, the armature 21 disposed between the rotor 18 and the end of the retainer 8 has a projection 22 provided on the inner diameter portion engaged with a notch 23 of the retainer 8 to hold the armature. It is not rotatable with respect to the container 8 and can move in the axial direction. Further, the thickness of the armature 21 is set so that a gap b is formed between the facing surfaces of the armature 21 and the rotor 18,
The relative rotation between the amateur 21 and the rotor 18 is enabled.

That is, since the rotor 18 is connected to the outer ring 2 and the armature 21 is connected to the input shaft 4 via the retainer 8 and the switch spring 13, the outer ring 2 is connected to the input shaft 4.
Can be rotated relative to each other.

The rotation transmission device 1 according to the first embodiment has the above-described configuration, and as shown in FIG.
A front propeller shaft 26 connecting the front differential 24 of the D car to the transmission and transfer 25
Or between the front differential 24 of the RR-based 4WD vehicle of FIG. 17 and the front propeller shaft 27 connecting the transmission and the transfer (including the rear differential) 25, and in the FF-based 4WD vehicle of FIG. It is installed in the middle of a rear propeller shaft 30 which connects a center differential 28 and a rear differential 29 of a type or a gear type. In any case, the 4WD vehicle has an ABS, and the input ring 5 of the input shaft 4 is directly connected to the input side, and the outer wheel 2 is directly connected to the output side.

During normal running of the 4WD vehicle, a current flows through the coil 16 of the electromagnetic clutch 14. When a current flows through the coil 16, a magnetic circuit is formed between the field core 17, the rotor 18, and the armature 21, and the rotor 18 attracts the armature 21 to be integrated.

Therefore, the outer race 2, the rotor guide 19, the rotor 18, the armature 21, and the retainer 8 are integrated and cannot be relatively rotated.

In this state, if the input shaft 4 and the outer ring 2 try to rotate relative to each other, the rotation of the retainer 8 is restricted by the outer ring 2, so that the phase is shifted with respect to the rotation of the input shaft 4, as shown in FIG. As described above, the phase of the roller 10 is engaged between the cam surface 7 and the cylindrical surface 6, the input shaft 4 and the outer ring 2 are in a directly connected state in which torque can be transmitted, and the vehicle travels four times.

During the four-wheel drive, the coil 16 of the electromagnetic clutch 14 is de-energized during the ABS operation of the vehicle.

When the power supply to the coil 16 is cut off, the rotor 18 and the armature 21 become free, and the retainer 8 and the input shaft 4 are notched 11
2, the roller 10 enters the neutral standby state shown in FIG. 2 and disengages the input shaft 4 and the outer ring 2 to bring about a two-wheel drive state.

As a result, the occurrence of power circulation between the front wheels and the rear wheels is prevented, and the difference in the rotational speeds of the front and rear wheels can be sensed as the ABS control, so that the ABS control can be easily performed as in the case of the 2WD vehicle.

Next, FIG. 6 shows a second embodiment of the rotation transmitting device 1. In each of the embodiments, the same portions will be described with the same reference numerals. In the second embodiment, the field core 17 is non-rotatably press-fitted into the fixed portion 15 and serves as a fixed member, and the rotor 18 is non-rotatably press-fitted into a non-magnetic rotor guide 19. The guide 19 is non-rotatably press-fitted and fixed to the outer race 2.

Therefore, the outer race 2, the rotor guide 19, and the rotor 18 do not rotate at any time. The armature 21 cannot be rotated with respect to the rotor 18 by the pin 33, but can be moved with a gap b in the axial direction.

A disc spring 31 is inserted between the armature 21 and the rotor 18, and the retainer 8 has a flange 32 at its end.
The flange 32 is sandwiched between the outer ring 2 and the armature 21 and receives a pressing load from the disc spring 31.

In the second embodiment, when the vehicle is normally driven by the four-wheel drive, the energization of the coil 16 of the electromagnetic clutch 14 is turned off, and the retainer 8 cannot rotate with the outer ring 2 due to friction torque caused by the pressing load of the disc spring 31. It has become.

In this state, when the input shaft 4 and the outer ring 2 try to rotate relative to each other, since the rotation of the retainer 8 is restricted by the outer ring 2, the roller 10 has the cam surface 7 and the cylindrical surface as shown in FIG. In this state, the vehicle is in a direct connection state in which torque can be transmitted, and the vehicle is driven four times.

In the above-described four-wheel drive state, when the vehicle is in the ABS operation, when the energization of the coil 16 of the electromagnetic clutch 14 is turned on based on the signal, the pressing load of the disc spring 31 is overcome, and the rotor 18 is armatured. As a result, the flange 32 of the retainer 8 receives no friction torque.

Then, the set switch spring 1 is set.
3, the phase of the input shaft 4 and the retainer 8 is returned to the neutral state, the transmission of the torque between the input shaft 4 and the outer wheel 2 becomes impossible, and the vehicle enters a two-wheel drive state. The difference in the number of rotations of the wheels can be easily detected, and the ABS control can be easily performed.

The third embodiment of the rotation transmitting device shown in FIGS.
In the embodiment, the outer ring side is the power input side,
The same parts as those in the first embodiment are denoted by the same reference numerals, and description will be omitted.

In the third embodiment, the input outer ring 2
A cam surface 7 is provided on the inner diameter surface of the
The outer diameter surface of the large-diameter portion corresponding to.

The retainer 8 provided between the input outer ring 2 and the output shaft 4a and the outer ring 2 are each provided with a notch 11 as shown in FIG.
a and 12a, and the switch spring 13 is bent and set there. When the notches 11a and 12a of the input outer ring 2 and the retainer 8 match each other, the positional relationship between the cam surface 7 of the input outer ring 2 and the pocket 9 and the roller 10 of the input outer ring 2 is as shown in FIG. There is a gap a between the cam surface 7 and the cam surface 7. Therefore, the switch spring 13
Is set, the output shaft 4a and the input outer ring 2 are not connected, and a neutral standby mode is set. ABS of vehicle
This state is maintained during operation.

The electromagnetic clutch 14 includes a field core 17
Is non-rotatably press-fitted into the fixed portion 15, the rotor 18 is externally press-fitted into the non-magnetic rotor guide 19a so as to be non-rotatable, and the rotor guide 19a is press-fitted or the like to the output shaft 4
a and is fitted non-rotatably.

Therefore, the output shaft 4a and the rotor guide 19
a, The rotor 18 does not rotate at any time.

Further, the armature 21 and the cage 8 are arranged as shown in FIG.
Similarly to the above, due to the engagement between the projection and the notch, rotation is impossible, but movement in the axial direction is allowed by the gap b,
The relative rotation between the amateur 21 and the rotor 18 is possible. That is, since the rotor 18 is connected to the output shaft 4a and the armature 21 is connected to the input outer ring 2 via the retainer 8 and the switch spring 13, the relative rotation between the input outer ring 2 and the output shaft 4a is possible.

In the third embodiment, when the vehicle is normally driven by a four-wheel drive, the energization of the coil 16 is turned on, and a magnetic circuit is formed between the field core 17, the rotor 18, and the armature 21. Attracts amateur 21 and unites. Therefore, the output shaft 4a, the rotor guide 19a, the rotor 18, the armature 21, and the retainer 8 are integrated and cannot be rotated relative to each other. In this state, input outer ring 2
When the rotation of the retainer 8 is restricted by the output shaft 4a when the output shaft 4a and the output shaft 4a are about to rotate relative to each other, the phase is shifted with respect to the rotation of the input outer ring 2 so that torque can be transmitted as shown in FIG. Thus, the four-wheel drive is performed in which the input outer wheel 2 and the output shaft 4a are directly connected.

When the energization of the coil 16 is turned off by the ABS operation signal during the four-wheel drive, the connection between the rotor 18 and the armature 21 is released, the transmission of the rotational torque between the input outer wheel 2 and the output shaft 4a is interrupted, and the 2WD ABS control becomes possible like a car.

A fourth embodiment of the rotation transmitting device shown in FIG. 12 shows a different example of the electromagnetic clutch 14 in the third embodiment.

In the fourth embodiment, the field core 17 is non-rotatably press-fitted into the fixed portion 15 and both are fixed members. The rotor 18 is non-rotatably press-fitted with a non-magnetic rotor guide 19a, and the rotor guide 19a is non-rotatably press-fitted and fixed to the output shaft 4a. Therefore, the output shaft 4a, the rotor guide 19a, and the rotor 18 do not rotate at any time. The armature 21 cannot be rotated with respect to the rotor 18 by the pin 33, but can be moved in the axial direction with the gap b. A disc spring 31 is inserted between the amateur 21 and the rotor 18. The retainer 8 has a flange 32,
The flange 32 is sandwiched between the rotor guide 19a and the armature 21 and receives a pressing load from the disc spring 31.

Therefore, when no current flows through the coil 16, the retainer 8 cannot rotate with the output shaft 4a due to the friction torque caused by the pressing load of the disc spring 31. Therefore, this state is the same as that of FIG.
To the output shaft 4a.

On the other hand, when an electric current flows through the coil 16, the pressing load of the disc spring 31 is overcome, the rotor 18 attracts the armature 21, and the flange 32 of the retainer 8 does not receive the friction torque. Then, the phase of the input outer ring 2 and the retainer 8 is returned to the neutral state by the set switch spring 13, and transmission of torque between the input outer ring 2 and the output shaft 4a becomes impossible.

Next, the fifth to seventh embodiments shown in FIGS. 13 to 15 will prevent the electromagnetic clutch 14 from deteriorating in performance due to the vibration of the armature 21 in the first and third embodiments. The example shown in FIG.

That is, in the first and third embodiments,
The amateur 21 has its inner diameter supported by the outer diameter of the cage 8 and its outer diameter supported by the outer race 2 or the rotor guide 19, but is not constrained in the axial direction. If the rotation transmission device 1 is mounted on the vehicle in this state, the rotor 18, the cage 8, the outer ring 2, and the rotor guide 19, which are in contact with the armature 21, are worn due to vibrations due to fretting.

Therefore, a fifth embodiment shown in FIG.
In the first embodiment, and in the sixth embodiment shown in FIG. 14, in the third embodiment, a disc spring 41 is inserted between each of the retainer 8 and the armature 21 to press the armature 21 against the rotor 18. I have.

In the fifth and sixth embodiments, assuming that the torque for bending the switch spring 13 is Tsw, the pressing force of the armature 21 against the rotor 18 by the disc spring 41 is small. Amateur 21
The elasticity of the coned disc spring 41 is set so that the friction torque Taw when is relatively rotated is smaller than the above Tsw.

Accordingly, the switch spring 13 is not bent by the friction torque Taw, and the positional relationship between the roller 10 and the retainer 8 remains in the neutral standby state shown in FIG. 2 or FIG.

As described above, when the armature 21 is constantly pressed against the rotor 18 by the disc spring 41, wear such as fretting is less likely to occur due to vehicle vibration, and the armature 21 and the rotor 18 are always in a certain load. Therefore, when the coil 16 is energized, there is an advantage that the time for attracting the amateur 21 can be reduced.

A seventh embodiment shown in FIG. 15 shows a rotation transmission device using a combination of a multi-plate clutch 51 with the fifth embodiment.

The multi-plate clutch 51 is axially movable integrally with the housing 52 in a rotational direction between a housing 52 fixed to the end of the outer race 2 and an inner ring 53 externally fitted to the input shaft 4. An outer plate 54 that becomes
A plate in which a plurality of inner plates 55 which are axially movable integrally with the inner ring 53 and which are axially movable are alternately assembled, and the plate group is axially pressed to one end of these plate groups to press the plates together. The input shaft 4 and the outer ring 2 can rotate freely when the current is not flowing through the coil 16, but the multi-plate clutch 5
A torque of 1 will be transmitted.

This torque transmission prevents a sudden change in torque when the rotation transmission device is disengaged and disengaged,
The purpose of the present invention is to stabilize the behavior of the vehicle by releasing an adverse effect on the ABS due to the engine inertia to the driven wheels during the S operation by an appropriate amount. The magnitude of the wet multi-plate torque (restraint force) is determined by the operation of the ABS. Is set small enough not to adversely affect the performance.

In the first and third embodiments, the electromagnetic clutch 14 is energized during normal running. If the power is supplied, the roller 10 is in the engaged state, and the rotation transmission device 1 is locked,
It does not impair the running performance of the original four-wheel drive vehicle. However, when the ABS is activated by sudden braking,
For example, when a relay in the rotation transmission device control circuit is operated by using a voltage signal of a solenoid valve or the like, the energization of the electromagnetic clutch 14 is cut off, the rotation transmission device becomes free, and the front wheels and the rear wheels of the vehicle are disconnected. Completely separated.

In the second and fourth embodiments, the electromagnetic clutch 14 is not normally energized. In this state, the rotation transmission device 1 is locked. When the ABS operates, the electromagnetic clutch 14 is energized by the relay, and the rotation transmission device becomes free.

The advantage of the use as in the second and fourth embodiments is that the rotation transmission device is locked even when the power supply to the rotation transmission device is cut off due to a failure or the like, and the vehicle runs as 4WD. it can.

In any of the embodiments, the distinction between the input and the output does not affect when the vehicle is mounted. For example, it may be mounted so that power is transmitted from the outer ring (output side) of the first embodiment.

By the way, the current full-time 4WD car is
A fluid coupling 61 such as a viscous fluid is used as a differential limiting mechanism between the front and rear shafts. As shown in FIG. 22, the fluid coupling 61 is used alone to drive the driven wheels.

Most of these differential limiting mechanisms have a characteristic that the differential limiting torque is large as compared with the input / output rotational speed difference.

The full-time 4WD exhibits its performance when driven and has high acceleration and running performance. However, when turning on a normal paved road, the rotation of the front wheels is faster than that of the rear wheels. The coupling 61 is unnecessarily dragged.

The unnecessary drag torque generated at the time of turning is not at a level that causes a tight corner braking phenomenon, but it restrains the rotation of the front and rear wheels to some extent, so that the steering operation becomes heavy and tire wear is accelerated. In addition, there is a problem that fuel consumption is deteriorated and the life of the torque characteristic of the fluid coupling 61 itself is shortened due to the generation of unnecessary drag torque.

Therefore, the eighth embodiment shown in FIG.
In the FF-based 4WD vehicle, the rotation transmission device 1 described in any one of the first to seventh embodiments is mounted on the propeller shaft 27 connecting the transmission and the transfer 25 and the rear differential 29 to a fluid coupling 61 such as a viscous fluid. And are connected in series.

The ninth embodiment shown in FIG.
In the R-based 4WD vehicle, the tenth embodiment shown in FIG. 21 shows a state in which the rotation transmission device 1 is mounted on each of the RR-based 4WD vehicles. In any case, the front differential 24, the transmission and the transfer 25 are connected to each other. On the front propeller shaft 26 to be connected, a fluid coupling 61 such as a viscous fluid is connected in series and arranged.

In the eighth to tenth embodiments,
The operation when the rotation transmitting device 1 shown in FIG. 1 is used will be described. In the rotation transmission device 1 shown in FIGS. 7, 13, 14, and 15, basically, the engagement between the input member and the output member is switched between lock and free by an electromagnetic clutch. Are the same.

The rotation transmission device 1 shown in FIG.
When D is required, when a current is applied to the coil 16 of the electromagnetic clutch 14, a magnetic circuit is formed between the field core 17, the rotor 18, and the armature 21, and the rotor 18 attracts the armature 21 to be integrated.

Therefore, the outer ring 2, the rotor guide 19,
The rotor 18, the amateur 21, and the retainer 8 are integrated,
Relative rotation becomes impossible.

When the input shaft 4 and the outer ring 2 try to rotate relative to each other in this state, the rotation of the retainer 8 is restricted by the outer ring 2, so that the phase is shifted with respect to the rotation of the input shaft 4, as shown in FIG. As described above, the phase of the roller 10 is engaged between the cam surface 7 and the cylindrical surface 6, and the input shaft 4 and the outer ring 2 are in a directly connected state capable of transmitting torque.
1, the torque is transmitted to the driven wheels.

Therefore, if the engagement of the rotation transmitting device 1 is in the locked state, the conventional 4WD performance can be exhibited.

On the other hand, when 4WD is unnecessary on a pavement road or the like, the power supply to the coil 16 of the electromagnetic clutch 14 of the rotation transmitting device 1 shown in FIG. 1 is cut off.

At this time, the rotor 18 and the armature 21 become free, the retainer 8 and the input shaft 4 are notched by the applied force of the switch spring 13, and the roller 10 enters the neutral state shown in FIG. The engagement between the shaft 4 and the outer ring 2 is released, and the vehicle travels 2WD.

As a result, the fluid coupling 61 is not driven, and unnecessary dragging during turning is eliminated, which is effective in improving fuel efficiency and preventing deterioration of the fluid coupling 61.

It should be noted that the energization of the electromagnetic clutch 14 is turned on,
OFF (4WD or 2WD) may be switched by a driver in the vehicle using a switch, or when the slip of the main drive wheel is detected by a rotational speed difference between front and rear wheels or an acceleration sensor or the like. An output signal may be output from the control device to the electromagnetic clutch 14 of the rotation transmission device 1.

In the mounting examples shown in FIGS. 19 to 21, the positions of the fluid coupling 61 and the rotation transmitting device 1 may be exchanged, or both may be housed in a transfer. Coupling 6 on the drive path of
1 and the rotation transmission device 1 mounted in series have the same effect and are included in the present invention.

[0083]

As described above, according to the present invention, 4 W
By mounting on the driving path of the D car, the driving force can be transmitted and cut off by the electromagnetic clutch.
By interrupting the transmission of the driving force based on the signal that the BS has been activated, there is no power circulation, and the rotational speed difference between the front and rear wheels is 2
As in the case of the WD vehicle, the ABS function can be changed independently of each other, and the ABS function, which has conventionally been incompatible with the 4WD vehicle, can be facilitated as in the case of the 2WD vehicle.

Further, by mounting the rotation transmitting device in series with the differential limiting mechanism on the drive path of the 4WD vehicle, it is possible to switch between transmission and cutoff of the driving force by the electromagnetic clutch, and to perform the switching on the paved road or the like. When 4WD is unnecessary, 2WD can be easily used.
To improve fuel efficiency, prevent deterioration of the fluid coupling, and reduce tire wear.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment.

FIG. 2 is an enlarged cross-sectional view taken along arrow II-II in FIG.

FIG. 3 is a sectional view taken along arrow III-III in FIG. 1;

FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG.

FIG. 5 is a sectional view showing a locked state of a portion indicated by an arrow II-II in FIG. 1;

FIG. 6 is a longitudinal sectional view of a main part showing a second embodiment.

FIG. 7 is a longitudinal sectional view showing a third embodiment.

8 is a longitudinal sectional view taken along arrows VIII-VIII in FIG.

9 is a longitudinal sectional view taken along the arrow IX-IX in FIG.

FIG. 10 is a sectional view showing a free state of a portion indicated by an arrow VIII-VIII in FIG. 7;

FIG. 11 is a sectional view showing a locked state of the above.

FIG. 12 is an enlarged sectional view of a main part showing a fourth embodiment.

FIG. 13 is a cross-sectional view showing a fifth embodiment.

FIG. 14 is a cross-sectional view showing a sixth embodiment.

FIG. 15 is a sectional view showing a seventh embodiment;

FIG. 16 is a plan view showing a mounting example of the rotation transmitting device.

FIG. 17 is a plan view showing a mounting example of the rotation transmitting device.

FIG. 18 is a plan view showing a mounting example of a rotation transmission device.

FIG. 19 is a plan view showing a mounting example of a rotation transmission device according to an eighth embodiment;

FIG. 20 is a plan view showing a mounting example of a rotation transmission device according to a ninth embodiment;

FIG. 21 is a plan view showing a mounting example of a rotation transmission device according to a tenth embodiment;

FIG. 22 is a plan view of a full-time 4WD vehicle equipped with a differential limiting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation transmission device 2 Outer ring 3 Bearing 4 Input shaft 7 Cam surface 8 Cage 9 Pocket 10 Roller 11, 12 Notch 13 Switch spring 14 Electromagnetic clutch 16 Coil 17 Field core 18 Rotor 19 Rotor guide 21 Amateur 61 Fluid coupling

Claims (12)

[Claims] 1. A shaft having a cam surface, a retainer, an outer ring, and a roller, a notch is provided in the shaft and the retainer, and an applying force is applied by an elastic member so that the notch coincides with the notch. The phase of the cam surface of the shaft and the pocket of the retainer are matched so that the roller, which is the engaging element, is fixed at a position with a gap between the outer ring and the shaft. In a rotation transmitting device capable of freely rotating in both directions, a magnetic force of an electromagnet is applied to a friction member fixed to the outer ring in order to integrate the outer ring with a retainer in order to engage the shaft and the outer ring with rollers. A rotation transmitting device, wherein a pressing force is generated by sucking an armature using the armature, and the outer ring and the retainer are integrated by the frictional force. 2. A notch comprising a shaft having a cam surface, a retainer, an outer ring, and a roller, wherein a notch is provided in the shaft and the retainer, and an imparting force is applied by an elastic member so that the notches coincide with each other. When the shafts coincide with each other, the phase of the cam surface of the shaft and the phase of the pocket of the retainer are fixed so that the roller serving as the engaging element has a gap between the outer ring and the shaft. In a rotation transmission device that can freely rotate in both directions, the retainer is pressed against the outer ring by an elastic member in advance, and the armature is attracted using the magnetic force of the electromagnet, so that the pressing force is eliminated and the outer ring is removed. A rotation transmission device characterized in that the retainer is rotatable. 3. An outer ring having a cam surface, a retainer, a shaft, and a roller, a notch is provided in the outer ring and the retainer, and an imparting force is applied by an elastic member so that the notch matches.
When the notches match, the phase of the cam surface of the outer ring and the phase of the pocket of the retainer are fixed such that the roller serving as the engaging element has a gap between the outer ring and the shaft. In a rotation transmission device that can freely rotate in both directions with respect to each other, an electromagnet is attached to a friction member fixed to the shaft in order to integrate the shaft and the retainer in order to engage the outer ring and the shaft with a roller. A rotating force transmission device characterized in that a pressing force is generated by attracting an armature using the magnetic force of (1), and the shaft and the retainer are integrated by the frictional force. 4. An outer ring having a cam surface, a retainer, a shaft, and a roller, a notch is provided in the outer ring and the retainer, and an applying force is applied by an elastic member so that the notch matches.
When the notches match, the phase of the cam surface of the outer ring and the phase of the pocket of the retainer are fixed such that the roller serving as the engaging element has a gap between the outer ring and the shaft. In a rotation transmission device that can freely rotate in both directions with each other, the retainer is pressed against the shaft by an elastic member in advance, and the armature is attracted by using the magnetic force of the electromagnet to eliminate the pressing force. A rotation transmission device characterized in that the shaft and the retainer are rotatable. 5. The rotation transmitting device according to claim 1, further comprising an elastic member for pressing the amateur against the friction member. 6. The rotation transmitting device according to claim 1, wherein an outer diameter side of the friction member is covered with a member made of a non-magnetic material. 7. The rotation transmission device according to claim 3, wherein an inner diameter side of the friction member is covered with a member made of a non-magnetic material. 8. The rotation transmitting device according to claim 1, wherein the rotation transmitting device is an FF.
It is located on the rear propeller shaft of a full-time four-wheel drive vehicle with ABS as the base or on the front wheel propulsion shaft of the full-time four-wheel drive vehicle with ABS based on FR and RR. Based on the signal when the ABS is activated, A rotation transmission device characterized in that a two-wheel drive state is set by turning off an electromagnetic clutch to easily detect a lock tire. 9. The rotation transmission device according to claim 2, wherein the rotation transmission device is an FF.
It is located on the rear propeller shaft of a full-time four-wheel drive vehicle with ABS as the base or on the front wheel propulsion shaft of the full-time four-wheel drive vehicle with ABS based on FR and RR. Based on the signal when the ABS is activated, A rotation transmission device characterized in that a two-wheel drive state is set by turning on an electromagnetic clutch to easily detect a lock tire. 10. The rotation transmission device according to claim 1, wherein the rotation transmission device is connected in series with a differential limiting mechanism on a driven wheel drive path of a four-wheel drive vehicle. A rotation transmitting device, which is disposed. 11. The rotation transmission device according to claim 10, wherein the on / off switch provided in the vehicle is used to manually switch between turning on and off the current to the electromagnet of the rotation transmission device. Method. 12. The rotation transmitting device according to claim 10, wherein the current to the electromagnet of the rotation transmitting device is output when a difference in rotation speed between the front and rear wheels or a slip of the main driving wheel is detected by an acceleration sensor or the like. A method for controlling a rotation transmission device, comprising: