JP3597353B2 - Rotation transmission device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission device used for switching between transmission and interruption of a driving force on a driving path of a vehicle.
[0002]
[Prior art]
When a 4WD vehicle that directly connects the front and rear wheels turns on a paved road, a so-called tight corner braking phenomenon occurs. To solve this problem, the present applicant has disclosed in Japanese Patent Application Nos. Hei 8-172598 and Hei 9 No. 28001 proposes a rotation transmission device using a roller type two-way clutch and an electromagnetic coil.
[0003]
As shown in FIGS. 17 and 18, this rotation transmission device outputs an output from a transmission 4 connected to an engine 3 to a transfer 5 in an FR-based 4WD vehicle in which a hub clutch 2 is mounted at each end of a front wheel 1. The rotation is transmitted directly to the propulsion shaft 8 of the rear wheel 7 via the input shaft 6 inside, and the rotation transmission between the input shaft 6 and the chain sprocket 9 mounted coaxially and relatively rotatable with the input shaft 6 inside the transfer 5. A two-way clutch 10 of a roller engagement type for performing disconnection and an electromagnetic clutch 11 for controlling locking and freeing of the two-way clutch 10 are provided, whereby a conventional typical part-time 4WD running mode (2WD, 4WD) is provided. -Hi, 4WD-Lo), and a 4WD control mode is added.
[0004]
According to this rotation transmission device, if the 4WD control mode is selected, the vehicle is normally in a rear-wheel drive (2WD) state while the vehicle is running at a constant speed, and when the vehicle accelerates, the electromagnetic clutch 11 detects the slip of the rear wheel. Electric current flows, and the two-way clutch 10 is locked to 4WD.
[0005]
Also, when a sudden engine brake is applied on a low μ road or the like, the slip of the rear wheel is detected, and a current is supplied to the electromagnetic clutch 11 to control to 4 WD.
[0006]
Further, if this device is used, as shown in FIG. 17, a driving mode of the vehicle such as a 2WD mode, a 4WDLOCK mode, and a 4WD AUTO (control) mode can be selected by the driver.
[0007]
[Problems to be solved by the invention]
However, in this system, when the 2WD mode is selected, the hub clutch 2 of the front wheel 1 is disconnected and the rotation of the front drive system is stopped, as indicated by hatching in FIG. 19, so that the outer wheel of the two-way clutch 10 also stops rotating. On the other hand, the camshaft and the rollers need to idle. The number of idle rotations is several thousand rpm in proportion to the vehicle speed. On the other hand, the oil level in the transfer 5 is lower than the rotation transmitting device as shown in FIG. 18, and the rotation of the chain 12 is stopped at the time of 2WD, so that only lubrication by stirring the Hi-Lo planetary gear 13 is given. Therefore, it is necessary to devise a lubrication surface so that sufficient oil reaches the inner surface of the outer ring of the two-way clutch 10. If the oil is insufficient, the outer ring and the roller may be seized and may not be able to run idle.
[0008]
Therefore, an object of the present invention is to change the arrangement of the rotation transmission device described above so that the rotation transmission device can be sufficiently lubricated even in the 2WD mode while maintaining the function of the conventional example as a vehicle, and further, can be idled. It is an object of the present invention to provide a rotation transmitting device that does not need to be performed.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the output from the transmission is transmitted directly to the rear wheel propulsion shaft via the input shaft inside the transfer, and the input shaft and the front wheel are A rotation transmission device including a two-way clutch that transmits and disconnects rotation of a propulsion output shaft and an electromagnetic clutch that controls locking and freeing of the two-way clutch, and incorporates a rotation transmission mechanism that switches between 2WD and 4WD. This adopts a configuration in which the rotation transmission mechanism is disposed so as to be immersed in the lubricating oil inside the transfer.
[0010]
According to a second aspect of the present invention, in the first aspect of the invention, the rotation transmitting mechanism coaxially and non-rotatably connects the inner member to the front wheel propulsion output shaft and is coaxially rotatably fitted to the output shaft. The outer ring is coaxially and non-rotatably connected to the output side chain sprocket, and a plurality of cam surfaces are provided on one of the inner member and the outer ring, and a cylindrical surface is provided on the other, and a wedge space is formed between both surfaces. A retainer is provided within the retainer, and an engaging element is incorporated in a plurality of pockets formed in the retainer, and an elastic member that supports and biases the retainer to a neutral position where the engaging element does not engage the cam surface and the cylindrical surface is retained. A two-way clutch is formed by locking between the inner member or the outer ring having the cam surface and the cam surface, and the electromagnetic clutch opposes the biasing force of the elastic member, and the circumferential phase of the retainer and the inner member or the outer ring is adjusted. Is adopted.
According to a third aspect of the present invention, in the first aspect, the rotation transmitting mechanism coaxially and non-rotatably connects the outer ring to the front wheel propulsion output shaft and is coaxially rotatably fitted to the output shaft. The inner member is coaxially and non-rotatably connected to the output side chain sprocket, one of the inner member and the outer ring has a plurality of cam surfaces and the other has a cylindrical surface, and a wedge space is formed between both surfaces. A retainer is provided in the wedge space, an engaging element is incorporated in a plurality of pockets formed in the retainer, and an elastic member that supports and biases the retainer to a neutral position where the engaging element does not engage with the cam surface and the cylindrical surface. A two-way clutch is formed by locking between the retainer and the inner member or the outer ring having the cam surface, and the electromagnetic clutch faces the retainer and the inner member or the outer ring in opposition to the urging force of the elastic member. It adopts a configuration that switches the directional phase. .
[0011]
According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the synchronizing means and the dog clutch are provided between the input shaft inside the transfer and the input side chain sprocket coaxially and rotatably fitted to the input shaft. In this configuration, a dog clutch is used to transmit and cut off power to the input side chain sprocket.
[0012]
According to a fifth aspect of the present invention, in the first to third aspects of the present invention, the inner wheel is non-rotatably provided on the front wheel propulsion output shaft inside the transfer at a position facing the rotation transmission mechanism with the output side chain sprocket interposed therebetween, An outer case coaxially rotatably fitted to the inner ring on the output shaft and non-rotatably connected to the output side chain sprocket, and a plurality of outer plates slidably and non-rotatably fitted with the outer case; And a plurality of inner plates fitted slidably and non-rotatably with the inner ring alternately, and the two plates are coaxially slid between the inner ring and the outer case with a friction flange fixed to the inner ring or the outer case. A multi-plate clutch is formed by being sandwiched between armatures that are fitted as possible, and the electromagnetic coil is The Mature is obtained by adopting the configuration combining the tuning mechanism adapted to crimp by magnetic force.
[0013]
According to a sixth aspect of the present invention, in the rotation transmitting device according to the fourth aspect of the present invention, the synchronizing action of the front wheel drive system when the traveling mode is switched from 2WD to 4WD while the vehicle is traveling is performed before the synchronization means is operated. This adopts a configuration in which the transmission device is locked first.
[0014]
Embodiment 1 of the present invention
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the first embodiment shown in FIGS. 1 to 5, FIG. 1 shows a 4WD drive layout incorporating the rotation transmitting device of the present invention, FIG. 2 is a sectional view of a transfer incorporating the rotation transmitting device, and FIG. Shows details of the rotation transmitting device.
[0015]
FIG. 1 shows a rotation transmission device 21 incorporated in a transfer 3 of an FR-based 4WD vehicle in which a hub clutch 2 is mounted at each end of the front wheels 1 and 1, whereby a conventional typical 4WD traveling is performed. In addition to the modes (2WD, 4WD-Hi, 4WD-Lo), a 4WD control mode and a 4WD lock mode are added.
[0016]
As shown in FIGS. 1 and 2, the output from the transmission 4 connected to the engine 3 is transmitted to the rear propeller shaft 8 via the Hi-Lo planetary gear 13 in the transfer 5. The Hi-Lo planetary gear 13 is a known technology, and is composed of a combination of a planetary gear set 14 and a slide gear 15 for selection. When passing through a high gear, it transmits a rotational torque in a one-to-one relationship and passes through a low gear. If so, the rotation is reduced and the torque increases.
[0017]
A transfer input shaft 22 communicating with the rear propeller shaft 8 is formed integrally with an input shaft chain sprocket 23, while a roller-type rotation transmitting device 21 rotates on a transfer output shaft 24 for driving a front propeller shaft below the transfer. The sprockets 23 and 25 are located at one end of the output-side chain sprocket 25 that is fitted with the sprockets 25, and are linked by a silent chain 26.
[0018]
As shown in FIG. 3, the rotation transmission device 21 has a cam ring 27 serving as an inner member fixed to the output shaft 24 so as to be non-rotatably coaxially rotatably and coaxially with the output shaft 24, and is rotatable to the output shaft 24 via a bearing 28. The cylindrical portion of the housing 29 that is externally inserted is an outer ring 30 that is externally fitted to the cam ring 27, and the housing 29 is coupled to the chain sprocket 25 and the spline 31 so as to rotate integrally.
[0019]
As shown in FIG. 3B, a plurality of cam surfaces 32 are provided on the outer periphery of the cam ring 27, the inner diameter of the outer ring 30 is a cylindrical surface 33, and a wedge-shaped space is formed between each cam surface 32 and the cylindrical surface 33. At the same time, a retainer 34 that fits over the cam ring 27 is provided in the wedge-shaped space, and a roller 36 as an engaging element is incorporated in a pocket 35 formed at a position corresponding to each cam surface 32 of the retainer 34, and a two-way A clutch 37 is formed.
[0020]
As shown in FIG. 4C, when the roller 36 is located at the center neutral position with respect to the cam surface 32, a gap H is formed between the roller 36 and the cylindrical surface 33, and the roller 36 does not transmit the rotation of the cam ring 27 to the outer ring 30. When the roller 36 is biased to one side of the wedge space by the retainer 34, the roller 36 bites between the cam surface 32 and the cylindrical surface 33, and is turned on to transmit the rotation of the cam ring 27 to the outer ring 30. .
[0021]
The other end of the switch spring 38 whose one end is locked to the retainer 34 is locked to the cam ring 27, and the roller 36 does not engage with the cam surface 32 and the cylindrical surface 33 as shown in FIG. The retainer 34 is supported and biased to the neutral position.
[0022]
An electromagnetic clutch 39 for controlling on / off of the two-way clutch 37 is provided between the output shaft 24 and the outer ring 30 at a position on one end side of the two-way clutch 37.
[0023]
The electromagnetic clutch 39 non-rotatably fixes the electromagnetic coil 40 to the transfer case 41 with bolts 42 and the like. The electrodes of the coil 40 are connected to an external controller (hereinafter referred to as ECU) 43 through the transfer case 41. As shown in FIG. 1, the ECU 43 calculates and judges the signals input from the rotation speeds of the front wheel 1 and the rear wheel 7, the mode selection switch 44, the ABS operation signal 45, and the like, and determines the current flowing through the electromagnetic coil 40. Control. As shown in FIG. 2, the rotation speed of the front wheel 1 is detected by a front speed sensor 46, and the rotation speed of the rear wheel 7 is detected by a rear speed sensor 47.
[0024]
A rotor 48 fitted externally so as to be rotatable with respect to the electromagnetic coil 40 serves as a friction flange fixed to the outer race 30 so as to rotate integrally therewith. An armature 49, which is slidable in the axial direction and non-rotatably fitted to the container 34, is disposed so as to overlap with the rotor 48 via an appropriate gap, and when the electromagnetic coil 40 is energized, the rotor 48 and the armature 49 are pressed by magnetic force. Then, the outer race 30 and the retainer 34 are fixed in the rotation direction.
[0025]
As described above, by attaching the rotation transmitting device 21 to the output shaft 24 for propulsion of the front wheels located at the lower portion in the transfer 5, the rotation transmitting device 21 is completely immersed in oil as shown in FIG. become.
[0026]
The first embodiment of the present invention is configured as described above, and its operation will be described mainly with reference to the power transmission path diagrams shown in FIGS. 4 (A) and 4 (B).
[0027]
[Action]
First, the 2WD mode of the transfer incorporating the rotation transmitting device 21 will be described. FIG. 4A shows a principle diagram of the rotation transmission device, and FIG. 4B shows a power transmission path at the time of 2WD. Power from the transmission 4 passes through a high-range gear and is input to the input shaft 22 of the transfer 5. The power branched from the input shaft 22 via the chain 26 is input to the outer ring 30 of the rotation transmission device 21.
[0028]
Further, when 2WD is selected by the separately provided traveling mode selection switch 44, no current flows through the electromagnetic coil 40 of the rotation transmitting device 21, and the two-way clutch 37 is connected to the two-way clutch 37 in FIG. ), The roller 36 and the cam ring 27 are separated from the outer ring 30. Therefore, there is no resistance between the output shaft 24 and the output side chain sprocket 25.
[0029]
Therefore, the power is not transmitted to the front wheel drive system including the cam ring 27 and the output shaft 24 without being transmitted, and in the 2WD mode, the connection of the hub clutch 2 is cut off, so that the drive is performed even during vehicle running as shown in FIG. The rotation of the shaft, the front differential, the front propeller shaft, the transfer output shaft 24, the cam ring 27 of the rotation transmission device 21, and the roller 36 can be stopped, and fuel-efficient traveling can be performed.
[0030]
In the 4WD mode (AUTO, LOCK), the operation of the roller-type rotation transmission device 21 is such that the power transmission direction changes from the outer ring 30 to the cam ring 27, but the locking method, the power transmission during each traveling, etc. are the same as in the conventional example. Is omitted.
[0031]
Embodiment 2 of the present invention
Next, a second embodiment will be described with reference to FIGS. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0032]
In the first embodiment, switching from 2WD to 4WD (AUTO, LOCK) mode can be performed only when the vehicle is stopped.
[0033]
This is because in the first embodiment, there is no tuning device for smoothly synchronizing the rotation of the front drive system during rotation stop with the main drive system during 2WD traveling.
[0034]
Therefore, if the two-way clutch 37 is operated during traveling in 2WD in the first embodiment, an impact is involved.
[0035]
In the second embodiment, a synchronizing device 51 is mounted in parallel with the two-way clutch 37 so that the device can be switched to the 4WD mode even during traveling.
[0036]
The synchronizing device 51 is disposed at a position facing the two-way clutch 37 via the output sprocket 25, and synchronizes the output shaft 24 and the output sprocket 25 by friction.
[0037]
The synchronizing device 51 is provided on the output shaft 24 at a position facing the rotation transmitting device 21 across the output side chain sprocket 25 so as not to rotate, and is rotatable coaxially with the inner ring 52 on the output shaft 24. The outer case 53 fitted to the outer case 53 is non-rotatably connected to the output side chain sprocket 25, and is slidable with the outer case 53 and slidable with the inner ring 52 so as to be slidable and relatively non-rotatable. A plurality of inner plates 55 fitted so as to be relatively non-rotatable are alternately overlapped, and the two plates 54, 55 are placed between the inner ring 52 and the outer case 53 with the friction flange 56 fixed to the inner ring 52 or the outer case 53. A multi-plate clutch is formed by being sandwiched between armatures 57 slidably fitted coaxially to form an electromagnetic clutch. Yl 58 is the friction flange 56 and the armature 57 are adapted to be crimped by the magnetic force, constitutes the tuning mechanism.
[0038]
In the second embodiment shown in FIGS. 6 and 7, when switching from 2WD to 4WD (AUTO, LOCK) even during traveling, the front drive system can be synchronized by the control as shown in FIG. The mode can be switched to the 4WD mode.
[0039]
Third Embodiment of the Invention
Next, a third embodiment shown in FIGS. 9 to 16 will be described. FIG. 9 is a layout diagram of a 4WD drive in which the rotation transmitting device 21 is incorporated, and FIG. 10 is a sectional view of a transfer in which the rotation transmitting device 21 is combined. The detailed description of the roller-type two-way rotation transmission device 21 is the same as that of the first embodiment, and will be omitted.
[0040]
FIG. 9 shows a case where a rotation transmission device 21 is mounted inside a transfer of an FR-based 4WD vehicle in which a hub clutch 2 is provided at each end of a front wheel 1.
[0041]
The difference from the first embodiment is that the transfer input shaft 22 and the input chain sprocket 23 are rotatable, and a synchronizer 61 and a dog clutch 62 for switching between transmission and cutoff of the rotation are further added. It is.
[0042]
As shown in FIGS. 9 and 10, the output from the transmission 4 extends through the Hi-Lo select gear 13 to the rear propeller shaft 8. The Hi-Lo select gear 13 is a known technology, and is composed of a planetary gear. When passing through a high gear, the rotational torque is transmitted in a one-to-one relationship. When passing through a low gear, the rotation is reduced and the torque increases. .
[0043]
The transfer input shaft 22 communicating with the rear propeller shaft 8 switches between transmission and cutoff of the rotation of the input shaft 22 and the input side chain sprocket 23 by a dog clutch 62 which is a known typical part-time 4WD switching method. Further, a so-called synchronizer 61 (tuning device) for enabling the dog clutch 62 to be turned on and off during traveling is provided. The input side chain sprocket 23 is rotatably fitted to the transfer input shaft 22. The on / off means of the dog clutch 62 may be an existing manual lever type or an automatic type (actuator operation).
[0044]
On the other hand, similarly to the first embodiment, the roller-type rotation transmission device 21 is located at one end of an output side chain sprocket 25 rotatably fitted on a transfer output shaft 24 for driving a front propeller shaft below the transfer. . A cam ring (inner ring) 27 of the rotation transmitting device 21 is fixed to the transfer output shaft 24 by serration or the like so as not to rotate relatively, while the outer ring 30 is connected to one end of the output side chain sprocket 25 by a spline or the like. . The output sprocket 25 is rotatably fitted to the output shaft 24. Even in this arrangement, the rotation transmission device 21 is completely immersed in oil.
[0045]
First, the 2WD mode of the transfer incorporating the rotation transmitting device 21 will be described. FIG. 12 shows a power transmission path at the time of 2WD. Power from the transmission 4 passes through a gear in the Hi range and is input to the input shaft 22 of the transfer 5. In the 2WD mode, the dog clutch 62 is disengaged, so that the input shaft 22 and the input side chain sprocket 23 idle and there is no resistance between them.
[0046]
On the other hand, in the 2WD mode, since the connection of the hub clutch 2 is disconnected, power is not transmitted to the input side chain sprocket 23, the output side chain sprocket 25, the rotation transmission device 21, the output shaft 24, that is, the front wheel drive system. The drive shaft, the front differential, the front propeller shaft, the transfer output shaft 24, the rotation transmission device 21, and the chain sprockets 23 and 25 can be stopped while the vehicle is running as shown in FIG. Can be.
[0047]
Further, both the outer ring 30 and the cam ring 27 of the rotation transmitting device 21 stop rotating, and therefore, in the rotation transmitting device 21, the outer ring 30 and the cam ring 27 do not run at all.
[0048]
When 2WD is selected, no current flows through the electromagnetic coil 40 of the rotation transmitting device 21 to reduce power consumption.
[0049]
The operation of the 4WD mode (AUTO, LOCK) is exactly the same as that of the first embodiment except that the dog clutch 62 is connected and the input shaft 22 and the input side chain sprocket 23 are directly connected, and the description thereof is omitted.
[0050]
In the third embodiment, when the mode is switched from 2WD to 4WD mode during running, the tuning operation is performed in the order shown in FIG.
[0051]
That is, when the switch is switched from 2WD to 4WD mode (AUTO, LOCK), the following operation is performed to switch to 4WD.
(1) Judgment of running or not (2) If running, actuate two-way clutch (3) Actuate synchro + dog clutch moving actuator (4) Judgment of synchronization or not (5) Operate hub clutch when synchronized (6) Shift to AUTO or LOCK mode A feature of this operation is that the two-way clutch 37 is always locked while the synchronizer 61 is operating. If the two-way clutch 37 is not locked at this time, the front drive system is not synchronized even if the synchronization is activated.
[0052]
In each of the above embodiments, the front wheel 1 and the front drive system are connected and disconnected by the automatic hub clutch 2 during the 2WD mode traveling. There is a vehicle of a type that uses a dog clutch 71 or the like between a differential and a drive shaft and stops the front propeller shaft and a part of the front differential during 2WD mode driving by disconnection and engagement of the clutch, but as shown in FIG. Is naturally established even in such a vehicle.
[0053]
Further, in each embodiment, the cam surface is provided on the outer diameter of the inner member, and the cylindrical surface is provided on the inner diameter side of the outer ring. The same holds for the surface.
[0054]
Also, as shown in FIG. 16, the same effect can be obtained by arranging the rotation transmitting device 21 on the front side of the output side chain sprocket 25.
[0055]
【The invention's effect】
As described above, according to the present invention, the rotation transmitting device can be immersed in the oil in the transfer, sufficient lubrication can be obtained, and the idling life can be prolonged, while maintaining the function as a vehicle as before. In addition, by separately providing a dog clutch between the transfer input shaft and the input chain sprocket, the rotation transmission device is completely disconnected in the 2WD traveling mode, so that the idling in the rotation transmission device is not required during the 2WD traveling, and the life is further extended. become longer.
[Brief description of the drawings]
FIG. 1 is a plan view showing a layout of a 4WD drive vehicle incorporating a rotation transmission device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a transfer incorporating a rotation transmission device. FIG. 4A is an enlarged cross-sectional view of a main part of the above, FIG. 4B is a cross-sectional view along the arrow bb of FIG. 4A, FIG. 4A is an explanatory view showing the principle of a rotation transmission device, and FIG. FIG. 5C is an explanatory view showing a transmission path at the time of 2WD, and FIG. 5C is an enlarged cross-sectional view of a main part showing a neutral state of the two-way clutch. FIG. 5 is a plan view showing a 2WD traveling of a 4WD drive vehicle. FIG. 7 is a plan view showing a layout of a 4WD drive vehicle incorporating the second embodiment of FIG. 7; FIG. 7 is a cross-sectional view showing the same transfer; FIG. 8 is a flowchart showing control for tuning a front drive system; 9 incorporates a third embodiment of the rotation transmitting device FIG. 10 is a plan view showing the layout of a 4WD drive vehicle. FIG. 10 is a cross-sectional view showing the same transfer. FIGS. 11A and 11B are cross-sectional views showing the operation of a synchro mechanism and a dog clutch. FIG. FIG. 13 is a plan view showing 2WD running. FIG. 14 is a flowchart showing control for tuning a front drive system. FIG. 15 is a plan view showing 2WD running. FIG. 17 is a plan view showing the layout of a 4WD drive vehicle. FIG. 17 is a plan view showing the layout of a 4WD drive vehicle incorporating a rotation transmission device as a prior art. FIG. 18 is a cross-sectional view of the same transfer. [Description of reference numerals]
REFERENCE SIGNS LIST 1 front wheel 2 hub clutch 7 rear wheel 21 rotation transmitting device 22 transfer input shaft 23 input side chain sprocket 24 transfer output shaft 25 output side chain sprocket 26 silent chain 27 cam ring 29 housing 30 outer ring 32 cam surface 33 cylindrical surface 34 retainer 36 roller 37 Two-way clutch 38 Switch spring 39 Electromagnetic clutch 40, 58 Electromagnetic coil 48 Rotor 49, 57 Armature 51 Synchro device 52 Inner ring 53 Outer case 54 Outer plate 55 Inner plate 56 Friction flange 61 Synchronizer 62 Dog clutch

Claims (6)

A two-way clutch for transmitting the output from the transmission directly to the rear wheel propulsion shaft via the input shaft inside the transfer, and transmitting and cutting off the rotation of the input shaft and the front wheel propulsion output shaft inside the transfer; In a rotation transmission device including an electromagnetic clutch for controlling lock and free of a clutch and incorporating a rotation transmission mechanism for switching between 2WD and 4WD, the rotation transmission mechanism is disposed so as to be immersed in lubricating oil inside the transfer. A rotation transmitting device, characterized in that: A rotation transmission mechanism coaxially and non-rotatably couples the inner member to the front wheel propulsion output shaft so that the outer ring cannot coaxially rotate with the output side chain sprocket fitted coaxially and rotatably with the output shaft. , A plurality of cam surfaces on one of the inner member and the outer ring, and a cylindrical surface on the other, a wedge space formed between both surfaces, a retainer provided in the wedge space, and a plurality of An elastic member that supports and biases the retainer to a neutral position where the engager does not engage the cam surface and the cylindrical surface is provided between the retainer and the inner member or the outer ring having the cam surface. 2. The rotation transmission according to claim 1, wherein the clutch is engaged to form a two-way clutch, and the electromagnetic clutch switches the circumferential phase of the retainer and the inner member or the outer ring in opposition to the urging force of the elastic member. apparatus. A rotation transmission mechanism coaxially and non-rotatably connects the outer ring to the front wheel propulsion output shaft and coaxially rotates the inner member to an output side chain sprocket fitted coaxially and rotatably to the output shaft. Impossible connection, providing a plurality of cam surfaces on one of the inner member and the outer ring and a cylindrical surface on the other, forming a wedge space between both surfaces, providing a cage in this wedge space, and forming this cage An elastic member for supporting and urging the retainer to a neutral position in which the engager does not engage with the cam surface and the cylindrical surface is provided on the inner member or the outer ring having the retainer and the cam surface. The two-way clutch is formed by locking between the two members, and the electromagnetic clutch switches the circumferential phase of the retainer and the inner member or the outer ring in opposition to the urging force of the elastic member. Rotation transmission device. Synchronizing means and a dog clutch are provided between the input shaft inside the transfer and the input side chain sprocket coaxially and rotatably fitted to the input shaft, and the dog clutch transmits and shuts off power to the input side chain sprocket. The rotation transmitting device according to any one of claims 1 to 3, wherein the rotation transmitting device can perform the following. On the output shaft for propulsion of the front wheels inside the transfer, the inner ring was provided non-rotatably at a position facing the rotation transmission mechanism with the output side chain sprocket interposed, and was fitted coaxially and rotatably with the inner ring on the output shaft. The outer case is non-rotatably connected to the output side chain sprocket, and a plurality of outer plates are slidably and non-rotatably fitted to the outer case, and a plurality of slidably and non-rotatably fitted to the inner race are the inner plates. The inner plate is alternately overlapped, and the two plates are sandwiched and provided between a friction flange fixed to the inner ring or the outer case and an armature slidably fitted coaxially between the inner ring and the outer case. A clutch is formed, and an electromagnetic coil presses the friction flange and the armature by magnetic force. Rotation transmission device according to any one of claims 1 to 3 in combination with adjusting mechanism. The rotation transmission device according to claim 4, wherein the synchronization operation of the front wheel drive system when the traveling mode is switched from 2WD to 4WD while the vehicle is traveling is locked before the synchronization means is operated. A method for controlling a rotation transmission device, comprising:

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