JP2023048324A - Drive mode switching mechanism - Google Patents

Abstract

To switch between two-wheel drive and four-wheel drive after simplifying structure.SOLUTION: A drive mode switching mechanism comprises: a case which rotates integrally with an input shaft, and an inside space of which is formed as an oil filling space; a driven-side clutch part rotated integrally with the case in the oil filling space; a screw rotated by a driving force of a power source transmitted through an output shaft in the oil filling space, made movable in a direction to/from the output shaft, and moved in a direction separating away from the output shaft by the output shaft rotated at a specific speed higher than the input shaft; a drive-side clutch part rotated integrally with the screw in the oil filling space, and moved in a direction to/from the driven-side clutch part in response to a movement of the screw; and a transmission action part energizing the screw and the drive-side clutch part in a direction approaching the output shaft, and transmitting the driving force of the power source transmitted to the output shaft to the screw.SELECTED DRAWING: Figure 3

Description

The present invention relates to a technical field of a drive system switching mechanism for switching between two-wheel drive and four-wheel drive.

Vehicles such as automobiles have two-wheel drive (system) and four-wheel drive (system) as systems for transmitting power generated by a power source such as an engine or an electric motor to driving wheels. Two-wheel drive is a system in which either the front wheels or the rear wheels are rotated by the driving force of the drive source, and four-wheel drive is a system in which both the front wheels and the rear wheels are rotated by the driving force of the drive source.

Some types of vehicles are capable of switching between two-wheel drive and four-wheel drive (for example, see Patent Document 1). Such a vehicle is provided with a driving system switching mechanism for transmitting the driving force of the driving source to the driving wheels by a power transmission device and switching between two-wheel drive and four-wheel drive.

Vehicles capable of switching between two-wheel drive and four-wheel drive are normally driven by two-wheel drive. When the wheels spin, the sensor detects the difference in rotational speed between the front and rear wheels, detects the wheel spin state, and operates the drive system switching mechanism based on the detection result to switch from 2-wheel drive to 4-wheel drive. is switched to.

By switching from two-wheel drive to four-wheel drive, the driving force from the drive source is transmitted to both the front wheels and the rear wheels, and even if one of the front wheels or the rear wheels spins, the other The driving force transmitted to the wheels ensures good running conditions on rough roads and the like.

JP 2019-14449 A

By the way, in a vehicle capable of switching between two-wheel drive and four-wheel drive as described above, a sensor that detects the difference in rotational speed between the front wheels and the rear wheels, a clutch that operates based on the detection result of the sensor, etc. and a control unit for controlling these parts are required, and the structure of the drive system switching mechanism is complicated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to switch between two-wheel drive and four-wheel drive while simplifying the structure.

First, the drive system switching mechanism according to the present invention is a drive system switching mechanism for switching between two-wheel drive and four-wheel drive, and the output is rotated by the driving force of the power source during two-wheel drive and four-wheel drive. a shaft, an input shaft that rotates in a state where the driving force of the power source is not transmitted during two-wheel drive, a case that rotates integrally with the input shaft and has an internal space formed as an oil-filled space; A driven-side clutch portion that rotates integrally with the case in the oil-filled space; a screw that is movable in a contacting/separating direction and is moved in a direction away from the output shaft by rotating the output shaft at a speed equal to or higher than a certain speed than the input shaft; a drive-side clutch portion that rotates as the screw and moves in a direction to separate and contact the driven-side clutch portion as the screw moves, and biases the screw and the drive-side clutch portion toward the output shaft. and a transmission acting portion for transmitting the driving force of the power source transmitted to the output shaft to the screw, wherein the driving side clutch portion is moved in a direction approaching the driven side clutch portion, whereby the driving The drive-side clutch portion and the driven-side clutch portion are engaged to switch from two-wheel drive to four-wheel drive, and the drive-side clutch portion moves away from the driven-side clutch portion. The engagement of the driven side clutch portion is released, and the four-wheel drive is switched to the two-wheel drive.

As a result, when the output shaft is rotated at a speed equal to or higher than the input shaft, the driving side clutch portion is moved along with the screw moving in the direction away from the output shaft. The clutch portion is engaged to switch from two-wheel drive to four-wheel drive.

According to the present invention, when the output shaft is rotated at a higher speed than the input shaft, the driving side clutch portion is moved along with the screw moved in the direction away from the output shaft. and the driven-side clutch portion are engaged to switch from two-wheel drive to four-wheel drive. Therefore, switching between two-wheel drive and four-wheel drive can be performed while simplifying the structure.

FIG. 2 to FIG. 5 show an embodiment of the drive system switching mechanism of the present invention, and show a schematic configuration of a vehicle. FIG. 5 is a schematic cross-sectional view showing the drive system switching mechanism in a state where the dog clutch is not engaged; FIG. 5 is a cross-sectional view showing part of the drive system switching mechanism in a state where the dog clutch is not engaged; FIG. 5 is a schematic cross-sectional view showing the drive system switching mechanism in a state where the dog clutch is engaged; FIG. 4 is a cross-sectional view showing part of the drive system switching mechanism in a state where the dog clutch is engaged;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for implementing the drive system switching mechanism of the present invention will be described below with reference to the accompanying drawings.
<Vehicle configuration>
First, an overview of the configuration of a vehicle 100 including the drive system switching mechanism 1 will be described (see FIG. 1).

The vehicle 100 is of a type capable of switching between two-wheel drive and four-wheel drive. For example, it has an engine (internal combustion engine) 101 as a drive source on the front end side. A transmission 102 is connected. Incidentally, when the vehicle 100 is an electric vehicle, a hybrid electric vehicle, or the like, a motor is provided as a drive source in place of or together with the engine 101 .

The transmission 102 may be a manual transmission, an automatic transmission, or a semi-automatic transmission, and is provided with a planetary gear mechanism and an electronically controlled coupling 103 (not shown) inside. A continuously variable transmission (CVT) may be used as an internal mechanism of the transmission 102 .

A front differential 104 is connected to the transmission 102 . Left and right front wheel drive shafts 105 are connected to the front differential 104, and front wheels 106 are connected to the front wheel drive shafts 105, respectively. Therefore, the driving force of the engine 101 is transmitted to the front wheels 106 via the front differential 104 and the front wheel drive shaft 105 .

During cornering of the vehicle 100 , the front differential 104 absorbs the difference in rotational speed between the left and right front wheels 106 , and the same torque is transmitted from the engine 101 to the front wheels 106 .

A rear differential 107 is arranged on the rear end side of the vehicle 100 . Left and right rear wheel drive shafts 108 are connected to the rear differential 107, and rear wheels 109 are connected to the rear wheel drive shafts 108, respectively.

During cornering of the vehicle 100 , the rear differential 107 absorbs the difference between the left and right rotation speeds of the rear wheels 109 , and the same torque is transmitted from the engine 101 to the rear wheels 109 .

A drive system switching mechanism 1 is arranged between the transmission 102 and the rear differential 107 . A driving force transmitted from the engine 101 to the transmission 102 can be transmitted from the transmission 102 to the rear differential 107 via the drive system switching mechanism 1 . The driving force of engine 101 transmitted to rear differential 107 via drive system switching mechanism 1 is transmitted to rear wheels 109 via rear wheel drive shaft 108 .

Vehicle 100 normally runs in two-wheel drive, and the driving force transmitted from engine 101 to transmission 102 is not transmitted from transmission 102 to rear differential 107 via drive system switching mechanism 1 . On the other hand, in vehicle 100 , driving force transmitted from engine 101 to transmission 102 is transmitted from transmission 102 to rear differential 107 via drive system switching mechanism 1 by switching from two-wheel drive to four-wheel drive.

Although the above example shows the vehicle 100 in which the front wheels are driven in the two-wheel drive, the vehicle 100 may be a type in which the rear wheels are driven in the two-wheel drive.

<Configuration of drive system switching mechanism>
The driving system switching mechanism 1 will be described below (see FIGS. 2 and 3).

The drive method switching mechanism 1 includes an output shaft 2 that rotates in the direction of the axis by the driving force of the engine 101 , an input shaft 3 that is positioned behind the output shaft 2 and rotates in the direction of the axis, and the output shaft 2 . It is provided with a mechanism main body 4 which is positioned between the input shafts 3 and in which necessary parts are arranged.

A front end of the output shaft 2 is connected to a transmission 102 , and driving force of an engine 101 is transmitted to the output shaft 2 via the transmission 102 . The driving force of the engine 101 is transmitted to the output shaft 2 during both two-wheel drive and four-wheel drive.

The rear end of the input shaft 3 is connected to the rear differential 107, and is rotated in the axial direction as the rear wheels 109 rotate during two-wheel drive. The driving force of the engine 101 is transmitted to the input shaft 3 via the output shaft 2 and the mechanism main body 4 during four-wheel drive, and the driving force of the engine 101 is not transmitted to the input shaft 3 during two-wheel drive.

The mechanism body 4 has a case 5 to which the input shaft 3 is connected at the rear end, and necessary parts arranged inside the case 5 . The front end of the input shaft 3 is connected to the center of the rear surface of the mechanism body 4 , and the mechanism body 4 rotates integrally with the input shaft 3 .

The case 5 has, for example, a cylindrical peripheral surface portion 6, a front surface portion 7 whose outer peripheral portion is continuous with the front end portion of the peripheral surface portion 6, and a rear surface portion 8 whose outer peripheral portion is continuous with the rear end portion of the peripheral surface portion 6. are doing. An insertion hole 7a is formed in the central portion of the front surface portion 7 so as to penetrate therethrough in the front-rear direction. An internal space of the case 5 is formed as an oil-filled space 5 a filled with oil 50 .

A driven clutch portion 9 is provided on the inner surface (front surface) side of the rear surface portion 8 . The driven-side clutch portion 9 has tooth portions 9a, 9a, . An inclined surface is formed on the tooth portion 9a.

A support shaft 10 is rotatably supported on the front surface portion 7 . The support shaft 10 has, for example, a substantially cylindrical support cylinder portion 11 extending in the front-rear direction and a connection base portion 12 attached to the front surface of the support cylinder portion 11 . is blocked. The diameter of the connecting base portion 12 is made larger than the diameter of the insertion hole 7a.

The support shaft 10 is rotatably supported by the front surface portion 7 with the support cylinder portion 11 inserted through the insertion hole 7a. The connection base portion 12 is positioned on the front side of the front surface portion 7 , and the rear end portion of the output shaft 2 is connected to the connection base portion 12 . Therefore, the support shaft 10 is rotated in the axial direction integrally with the output shaft 2, and the portion of the support cylinder portion 11 excluding the front end portion is rotated in the oil filling space 5a.

A support space 13 is formed on the front side of the support cylinder portion 11 , and the support space 13 is opened forward in the support cylinder portion 11 . An insertion space 14 is formed behind the support space 13 in the support cylinder portion 11 . Spline grooves 14a, 14a are formed in the support cylinder portion 11 so as to extend in the front-rear direction at positions opposite to each other by 180 degrees in the insertion space 14. As shown in FIG. A shaft insertion hole 15 communicating with the support space 13 and the insertion space 14 is formed in the support cylinder portion 11 . The diameter of the shaft insertion hole 15 is made smaller than the diameters of the support space 13 and the insertion space 14 . The support cylinder portion 11 is formed with an oil flow hole 16 that communicates with the support space 13 and the oil filled space 5a when the support shaft 10 is supported by the case 5 .

A rotating body 17 is arranged in the oil-filled space 5a. The rotating body 17 extends forward from the central portion of the connecting shaft 18 extending in the longitudinal direction, the screw 19 connected to the front end of the connecting shaft 18, the drive-side clutch portion 20 connected to the rear end of the connecting shaft 18, and the screw 19. and a protruding spline shaft 21 .

The screw 19 rotates in one direction, thereby generating a driving force in the direction of moving the rotating body 17 backward. Therefore, when the screw 19 is rotated in one direction, a moving force is generated in the rotating body 17 in the direction in which the driving side clutch portion 20 approaches the driven side clutch portion 9 .

The drive-side clutch portion 20 has a substantially disc-shaped clutch base 20a facing in the front-rear direction and tooth portions 20b, 20b, . . . , . . . are spaced apart in the circumferential direction. An inclined surface is formed on the tooth portion 20b.

A dog clutch 22 is composed of the driving side clutch portion 20 and the driven side clutch portion 9 . The dog clutch 22 is different from a friction clutch in which flat plates are pressed against each other and fastened by a frictional force. It is a clutch that is engaged by being engaged and maintains a high fastening force.

The spline shaft 21 is provided with spline protrusions 21a, 21a extending back and forth at positions opposite to each other by 180 degrees.

A spline shaft 21 of the rotor 17 is inserted into the insertion space 14 from behind, and the spline protrusions 21a of the spline shaft 21 are inserted into the spline grooves 14a, 14a, respectively. Therefore, the rotating body 17 is rotated integrally with the support shaft 10 and is movable in the longitudinal direction with respect to the support shaft 10 . Therefore, since the support shaft 10 and the output shaft 2 are rotated together, the output shaft 2, the support shaft 10 and the rotor 17 are rotated together.

A piston 23 is connected to the spline shaft 21 . The piston 23 has a shaft portion 23a whose rear end portion is connected to the front end portion of the spline shaft 21 and a pressing plate portion 23b attached to the front end portion of the shaft portion 23a.

With the spline shaft 21 inserted into the insertion space 14, the piston 23 is inserted into the support space 13 from the insertion space 14 through the shaft insertion hole 15, and the pressing plate portion 23b is positioned in the support space 13. be done.

A coil spring 24 is arranged in the support space 13 behind the pressing plate portion 23b. The coil spring 24 is a compression coil spring and is pressed from behind by the pressing plate portion 23b. Therefore, the biasing force of the coil spring 24 is transmitted to the rotor 17 by the piston 23, and the rotor 17 is biased forward.

The support shaft 10, the spline shaft 21, and the coil spring 24 serve as a transmission action portion 25 that urges the screw 19 in a direction toward the output shaft 2 and transmits the driving force of the engine 101 transmitted to the output shaft 2 to the screw 19. Function.

A control valve 26 is arranged in the oil flow hole 16 of the support shaft 10 . The control valve 26 controls the inflow speed of the oil 50 from the oil-filled space 5a to the support space 13 and the outflow speed of the oil 50 from the support space 13 to the oil-filled space 5a at different speeds. Specifically, the control valve 26 controls the outflow speed of the oil 50 from the support space 13 to the oil-filled space 5a to be faster than the inflow speed of the oil 50 from the oil-filled space 5a to the support space 13 .

<Operation of Drive System Switching Mechanism>
The operation of the drive method switching mechanism 1 will be described below (see FIGS. 2 to 5).

When the vehicle 100 is not running, the driving side clutch portion 20 is positioned in front of the driven side clutch portion 9 due to the forward biasing force of the coil spring 24 on the rotating body 17, and the dog clutch 22 is disengaged.

When the vehicle 100 starts running, the driving force of the engine 101 is transmitted to the output shaft 2 . The vehicle 100 is normally driven in a two-wheel drive mode with good fuel efficiency (see FIGS. 2 and 3).

In two-wheel drive, the output shaft 2 is rotated by the driving force of the engine 101, the input shaft 3 is rotated with the rotation of the rear wheels 109, and the rotational speeds of the output shaft 2 and the input shaft 3 are substantially the same. there is Therefore, the rotation speeds of the support shaft 10 and the rotating body 17 that rotate together with the output shaft 2 are substantially the same as the rotation speeds of the case 5 that rotates together with the input shaft 3 and the driven clutch portion 9. has been

At this time, the rotating body 17 is not moved rearward by the forward biasing force of the coil spring 24, and the state in which the driving side clutch portion 20 is positioned in front of the driven side clutch portion 9 is maintained, and the dog clutch 22 is in the non-engaged state. maintained.

When the vehicle 100 is running in two-wheel drive mode, the rotation speed of the front wheels 106 becomes faster than the rotation speed of the rear wheels 109 when the front wheels 106 spin on rough roads such as snow or gravel. Therefore, the output shaft 2 is rotated at a high speed with respect to the input shaft 3 , and the rotation speed of the support shaft 10 and the rotating body 17 which are rotated integrally with the output shaft 2 is faster than the rotation speed of the input shaft 3 .

As the rotational speed of the rotating body 17 increases, the propelling force in the backward moving direction generated in the rotating body 17 by the screw 19 rotated at high speed increases, and the rotating body 17 moves backward against the biasing force of the coil spring 24. It is moved (see FIGS. 4 and 5). As the rotating body 17 is moved rearward, the driving side clutch portion 20 is engaged with the driven side clutch portion 9 and the dog clutch 22 is brought into the engaged state.

When the dog clutch 22 is engaged, the driving force of the engine 101 transmitted to the output shaft 2 is transmitted from the output shaft 2 to the case 5 and the input shaft 3 via the support shaft 10 and the rotating body 17, and the output shaft 2 and the input shaft 3 are integrally rotated at the same speed, and the rear wheels 109 are rotated by the driving force of the engine 101 to switch to four-wheel drive.

When the two-wheel drive is switched to the four-wheel drive, the output shaft 2 and the input shaft 3 are rotated at the same speed, and the screw 19 no longer generates thrust. At this time, the inclined surface formed on the tooth portion 20b of the drive-side clutch portion 20 and the inclined surface formed on the tooth portion 9a of the driven-side clutch portion 9 are engaged to increase the fastening force of the dog clutch 22. The engagement state between the drive-side clutch portion 20 and the driven-side clutch portion 9 is not immediately released.

On the other hand, when the force acting to release the engagement of the dog clutch 22, such as the driving force of the engine 101 or the biasing force of the coil spring 24, becomes larger than the engagement force of the dog clutch 22, the engagement state of the dog clutch 22 is released, and the rotating body 17 rotates. It is moved forward by the biasing force of the coil spring 24 (see FIGS. 2 and 3). Therefore, the dog clutch 22 is released, and the four-wheel drive is switched to the two-wheel drive.

By switching from four-wheel drive to two-wheel drive, the output shaft 2 is rotated by the driving force of the engine 101, and the input shaft 3 is rotated as the rear wheels 109 rotate.

In the above description, an example of the drive system switching mechanism 1 provided in the vehicle 100 in which the two-wheel drive is performed by front-wheel drive is shown. In the case of the mechanism 1, compared with the above case, the positional relationship of each part is reversed from front to back.

Therefore, in the drive system switching mechanism 1 provided in the vehicle 100 in which the two-wheel drive is performed by the rear-wheel drive, the input shaft 3 is positioned in front of the output shaft 2, and the driven-side clutch portion is arranged inside the case 5 in order from the front side. 9, the rotating body 17, and the support shaft 10 are arranged side by side, and when the rotating body 17 is urged backward by the coil spring 24, the dog clutch 22 is engaged and the two-wheel drive is switched to the four-wheel drive. be done.

<Summary>
As described above, in the drive method switching mechanism 1, the driven side clutch portion 9 that rotates integrally with the case 5 and the output shaft 2 rotate at a higher speed than the input shaft 3. The screw 19 moved in the direction away from the output shaft 2 by the movement of the screw 19, the driving side clutch portion 20 moved in the direction of separating and contacting the driven side clutch portion 9 with the movement of the screw 19, and the output shaft 2 and a transmission acting portion 25 for transmitting the driving force of the power source to the screw 19 . is engaged to switch from two-wheel drive to four-wheel drive, and the drive-side clutch portion 20 is moved away from the driven-side clutch portion 9, thereby releasing the engagement between the drive-side clutch portion 20 and the driven-side clutch portion 9. It is switched from four-wheel drive to two-wheel drive.

Therefore, when the output shaft 2 is rotated at a higher speed than the input shaft 3, the driving side clutch portion 20 is moved along with the screw 19 moving away from the output shaft 2, thereby moving the driving side clutch. Since the portion 20 and the driven side clutch portion 9 are engaged to switch from two-wheel drive to four-wheel drive, it is possible to switch between two-wheel drive and four-wheel drive while simplifying the structure.

In particular, it is possible to switch between two-wheel drive and four-wheel drive without requiring a sensor for detecting the rotation speed of the front wheels 106 and the rear wheels 109, a control unit for controlling each part, or the like. It is possible to switch between two-wheel drive and four-wheel drive without complicating the structure of the vehicle.

Further, since the dog clutch 22 is composed of the drive-side clutch portion 20 and the driven-side clutch portion 9, the engagement state is stabilized by the dog clutch 22 when the drive-side clutch portion 20 and the driven-side clutch portion 9 are engaged.

Therefore, the engagement state of the driving side clutch portion 20 and the driven side clutch portion 9 is not unintentionally released due to an external force such as vibration generated in the vehicle 100 or the urging force of the transmission action portion 25, and the four-wheel drive vehicle can be operated. 100 stable running performance can be continuously ensured.

Further, the transmission action part 25 includes the support shaft 10, the coil spring 24 and the spline shaft 21, the support shaft 10 is connected to the output shaft 2 and rotates together with the output shaft 2, and the coil spring 24 is arranged in the support space 13. , a spline shaft 21 is inserted into the insertion space 14 .

Therefore, since each part of the transmission action part 25 is arranged or supported on the support shaft 10, it is possible to switch between two-wheel drive and four-wheel drive while simplifying the structure.

Furthermore, the support shaft 10 is formed with an oil flow hole 16 that communicates with the support space 13 and the oil filling space 5a. , the inflow speed of the oil 50 from the oil-filled space 5a to the support space 13 and the inflow speed of the oil 50 from the support space 13 to the oil-filled space 5a are controlled to be different speeds.

Therefore, the expansion/contraction speed of the coil spring 24 is controlled by the flow speed of the oil 50 controlled by the control valve 26, and the moving speed when the driving side clutch portion 20 moves toward the driven side clutch portion 9 is determined by the driving side clutch portion 20. 20 can be moved in a direction away from the driven-side clutch portion 9, so that switching from two-wheel drive to four-wheel drive can be performed quickly.

Additionally, the screw 19 and the drive-side clutch portion 20 are connected by a connecting shaft 18 , and a spline shaft 21 protrudes from the central portion of the screw 19 .

Therefore, since the screw 19, the drive-side clutch portion 20, and the spline shaft 21 are not configured to be rotated separately, the screw 19, the drive-side clutch portion 20, and the spline shaft 21 are rotated integrally after simplifying the structure. can be made

100 vehicle 101 engine 1 drive system switching mechanism 2 output shaft 3 input shaft 5 case 5a oil filling space 9 driven side clutch portion 10 support shaft 13 support space 14 insertion space 16 oil flow hole 18 connecting shaft 19 screw 20 driving side clutch portion 21 Spline shaft 22 Dog clutch 24 Coil spring 25 Transmission action part 26 Control valve

Claims (5)

A drive system switching mechanism for switching between two-wheel drive and four-wheel drive,
an output shaft rotated by the driving force of the power source during two-wheel drive and four-wheel drive;
an input shaft rotated in a state in which the driving force of the power source is not transmitted during two-wheel drive;
a case that rotates integrally with the input shaft and has an internal space formed as an oil-filled space;
a driven clutch portion that rotates integrally with the case in the oil filling space;
In the oil-filled space, it is rotated by the driving force of the power source transmitted through the output shaft and is movable in the direction of separating and contacting the output shaft, and the output shaft is faster than the input shaft at a certain speed or higher. a screw that is moved away from the output shaft by being rotated;
a drive-side clutch portion that rotates integrally with the screw in the oil filling space and moves in a direction to separate and contact the driven-side clutch portion as the screw moves;
a transmission action part that biases the screw and the drive-side clutch part in a direction toward the output shaft and transmits the driving force of the power source transmitted to the output shaft to the screw;
By moving the drive-side clutch portion in a direction approaching the driven-side clutch portion, the drive-side clutch portion and the driven-side clutch portion are engaged to switch from two-wheel drive to four-wheel drive,
By moving the drive-side clutch portion in a direction away from the driven-side clutch portion, engagement between the drive-side clutch portion and the driven-side clutch portion is released, thereby switching from four-wheel drive to two-wheel drive. mechanism. 2. The drive method switching mechanism according to claim 1, wherein a dog clutch is configured by the drive-side clutch portion and the driven-side clutch portion. The transmission action part comprises a support shaft having a support space and an insertion space, a coil spring that biases the screw in a direction toward the output shaft, and a spline shaft that is axially movably supported by the support shaft,
the support shaft is connected to the output shaft and rotated integrally with the output shaft;
The coil spring is arranged in the support space,
3. The drive method switching mechanism according to claim 1, wherein the spline shaft is inserted into the insertion space. The support shaft is formed with an oil flow hole that communicates with the support space and the oil filling space,
A control valve is disposed in the oil flow hole to control the flow speed of the oil,
4. The drive system switching according to claim 3, wherein the control valve controls the inflow speed of oil from the oil-filled space to the support space and the outflow speed of oil from the support space to the oil-filled space to be different speeds. mechanism. the screw and the drive-side clutch portion are connected by a connecting shaft,
5. The drive method switching mechanism according to claim 3, wherein the spline shaft protrudes from the central portion of the screw.

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