JP2001090748A - Electromagnetic clutch structure in driving force distribution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts without deteriorating functions of two electromagnetic clutches provided in a driving force distribution device. SOLUTION: Two electromagnetic clutches CL, CR disposed to be adjacent to left and right symmetric surfaces P for distributing driving force to two shafts are respectively provided with outer guides 24L, 24R, inner guides 25L, 25R, cores 21L, 21R, coils 23L, 23R, an armature 32, outer discs 30L, 30R, and inner discs 31L, 31R, where the armature 32 is commonly used for both electromagnetic clutches CL, CR. Since the coils 23L, 23R of the left and the right electromagnetic clutches CL, CR are not simultaneously excited, the left and the right electromagnetic clutches CL, CR can be actuated without troubles by movement of the common armature 32 left or right.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force distribution device for distributing torque between two shafts by selectively operating two electromagnetic clutches, and more particularly, to a structure of the electromagnetic clutch.

[0002]

2. Description of the Related Art A driving force distributing device having two clutches makes it possible to distribute the driving force of an engine to left and right driving wheels, to increase the driving force distributed to a turning outer wheel and to distribute the driving force to a turning inner wheel. A technique for increasing the turning performance by generating a yaw moment in the turning direction by reducing the force is known. In such a driving force distribution device,
The present applicant has already proposed a clutch composed of electromagnetic clutches (Japanese Patent Application No. 11-176651).
No.). The electromagnetic clutch includes a coil, a friction engagement member, and an armature, and the friction engagement member is engaged with the armature attracted to the excited coil.

[0003]

Incidentally, in a driving force distribution device having two electromagnetic clutches, it is desired that the components of the electromagnetic clutches be shared as much as possible to reduce the number of components.

The present invention has been made in view of the above circumstances, and has as its object to reduce the number of components without impairing the functions of two electromagnetic clutches provided in a driving force distribution device.

[0005]

According to the first aspect of the present invention, there is provided a first electromagnetic clutch for transmitting torque from one shaft to another shaft, and a second electromagnetic clutch for transmitting torque from one shaft to the other shaft. And a second electromagnetic clutch that transmits torque to one of the shafts, and selectively operates the first and second electromagnetic clutches to distribute torque between the two shafts. One side of the first electromagnetic clutch
A friction engagement member and a first coil are arranged, and a second friction engagement member and a second coil of a second electromagnetic clutch are arranged on the other side of the armature, and the armature is moved in one direction by excitation of the first coil. An electromagnetic clutch in the driving force distribution device, wherein the first frictional engagement member is engaged, and the armature is moved in the other direction by the excitation of the second coil to engage the second frictional engagement member. A structure is proposed.

According to the above configuration, a common armature is arranged between the first and second electromagnetic clutches, and the first coil is excited to move the armature in one direction to engage the first frictional engagement member. Since the second armature is excited and the second coil is excited to move the armature in the other direction to engage the second frictional engagement member, the number of armatures can be minimized and the number of parts can be reduced. Moreover, since the first and second electromagnetic clutches are not engaged at the same time, the operation of the first and second electromagnetic clutches does not hinder even if the number of amateurs is one.

Incidentally, the left output shaft 9 of the embodiment_LIs one of the present invention
And the right output shaft 9 of the embodiment. _RIs the other of the present invention
The coil 23 according to the embodiment corresponds to the axis._LIs the first carp of the present invention.
Corresponding to the coil 23 of the embodiment._RIs the second carp of the present invention.
According to the embodiment of the outer disc 30_LAnd Inn
Nurse disk 31_LCorresponds to the first friction engagement member of the present invention.
And the outer disk 30 of the embodiment._RAnd Inner
Disk 31_RCorresponds to the second friction engagement member of the present invention,
Example left electromagnetic clutch C_LIs the first electromagnetic clutch of the present invention.
And the right electromagnetic clutch C of the embodiment._RIs the second of the present invention.
Corresponds to electromagnetic clutch.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a view showing the structure of a driving force distribution device, and FIG. 2 is a diagram showing driving force distribution during a right turn in a middle to low vehicle speed range. FIG. 3 is a diagram showing the operation of the device, FIG. 3 is a diagram showing the operation of the driving force distribution device at the time of turning left in a middle to low vehicle speed range, FIG.
4 is a sectional view taken along line 5-5 in FIG. 4, and FIG. 6 is a sectional view taken along line 6-6 in FIG.

[0010] As shown in FIG.
Front mounted on the front of the vehicle
The transmission M is connected to the right end of the engine E
After the engine E and transmission M
The driving force distribution device T is disposed in the section. Driving force distribution device T
Drive shaft extending left and right from the left and right edges of the
A_LAnd right drive shaft A_RTo the left front
Wheel W_FLAnd right front wheel W _FRIs connected.

The driving force distribution device T includes a differential device D to which driving force is transmitted from an external gear 3 meshing with an input gear 2 provided on an input shaft 1 extending from a transmission M.
The differential device D is composed of a double pinion type planetary gear mechanism, and a ring gear 4 formed integrally with the external gear 3.
A sun gear 5 disposed coaxially inside the ring gear 4, an outer planetary gear 6 meshing with the ring gear 4 and an inner planetary gear 7 meshing with the sun gear 5; and a planetary carrier 8 supporting the sun gear 5 in a mutually meshed state. Consists of The differential device D is
While the ring gear 4 functions as an input element,
The sun gear 5 functioning as one output element is a left output shaft 9
Is connected to the left front wheel W _FL via _L, and the addition planetary carrier 8 functioning as the other output element is connected to the right front wheel W _FR via the right output shaft 9 _R.

The carrier member 11 rotatably supported on the outer periphery of the left output shaft 9 _L is provided with four pinion shafts 12 arranged at 90 ° intervals in the circumferential direction. The triple pinion member 16 integrally formed with the two pinions 14 and the third pinion 15 is attached to each of the pinion shafts 12.
Are rotatably supported.

A first sun gear 17 rotatably supported on the outer periphery of the left output shaft 9 _L and meshing with the first pinion 13.
Are connected to the planetary carrier 8 of the differential D.
The second sun gear 18 fixed to the outer periphery of the left output shaft 9 _L
Meshes with the second pinion 14. Further, the left output shaft 9
_A third sun gear 19 rotatably supported on the outer periphery of _L meshes with the third pinion 15.

The numbers of teeth of the first pinion 13, the second pinion 14, the third pinion 15, the first sun gear 17, the second sun gear 18, and the third sun gear 19 in the embodiment are as follows.

Number of teeth of first pinion 13 Z ₂ = 17 Number of teeth of second pinion 14 Z ₄ = 17 Number of teeth of third pinion 15 Z ₆ = 34 Number of teeth of first sun gear 17 Z ₁ = 32 Second sun gear the number of teeth Z ₅ = 32 third sun gear 19 of the number of teeth Z ₃ = 28 the third sun gear 19 of 18 can be coupled to the housing 20 via the left electromagnetic clutch C _L, carrier by engagement of the left electromagnetic clutch C _L The rotation speed of the member 11 is increased. The carrier member 11 can be coupled to the housing 20 via a right electromagnetic clutch C _R, the rotational speed of the carrier member 11 is reduced by engagement of the right electromagnetic clutch C _R. The right electromagnetic clutch C _R and the left electromagnetic clutch C
_L is an electronic control unit U including a microcomputer
Is controlled by

The electronic control unit U has an engine torque T
e, engine speed Ne, vehicle speed V and steering angle θ are predetermined
Calculation processing based on the program of
Chi C _LAnd right electromagnetic clutch C_RControl.

Therefore, when the vehicle makes a right turn in a medium to low vehicle speed range,
Corresponds to a command from the electronic control unit U as shown in FIG.
More right electromagnetic clutch C_RAre engaged and the carrier member 11 is
It is connected to the housing 20 and stopped. At this time, left front
Wheel W_FLLeft output shaft 9 integrated with_LAnd the right front wheel W_FRAnd one with the right
Output shaft 9_R(That is, the planetary carrier of the differential D)
8) means the second sun gear 18, the second pinion 14, the first
Connected via a pinion 13 and a first sun gear 17
The front left wheel W_FLRotation speed N_LIs the right front wheel W _FRTimes
Number of turns N_RIs increased by the following equation.

N _L / N _R = (Z ₄ / Z ₃ ) × (Z ₁ / Z ₂ ) = 1.143 (1) As described above, the rotational speed N _L of the left front wheel W _FL is increased to the right front wheel. W
_{When the} speed is increased with respect to the rotational speed N _{R of the FR} , as shown by the hatched arrow in FIG. 2, a part of the torque of the right front wheel W _FR which is the turning inner wheel is partially converted to the left front wheel W which is the turning outer wheel. Can be transmitted to _FL .

The carrier member 11 is connected to the right electromagnetic clutch C
Instead of stopping by _R, if reducing the rotational speed of the carrier member 11 by appropriately adjusting the engagement force of the right electromagnetic clutch C _R, the right front wheel W _FR and rotation speed N _L of the left front wheel W _FL in accordance with the deceleration can Hayashi increased relative to the rotational speed N _R, to transmit any torque from the right front wheel W _FR as a turning-inner to the left front wheel W _FL is the outer turning wheel.

On the other hand, when the vehicle turns left in the middle to low vehicle speed range, the left electromagnetic clutch _CL is engaged by a command from the electronic control unit U, as shown in FIG. Is coupled to the housing 20 via the As a result, the rotational speed of the carrier member 11 is increased relative to the rotational rate of the left output shaft 9 _L, the rotation speed N _R of the right front wheel W _FR
Is increased with respect to the rotation speed _NL of the left front wheel _{WFL according} to the following equation.

N _R / N _L = {1- (Z ₅ / Z ₆ ) × (Z ₂ / Z ₁ )} {1- (Z ₅ / Z ₆ ) × (Z ₄ / Z ₃ )} = 1 .167 (2) As described above, the rotation speed N _R of the right front wheel W _FR is changed to the left front wheel W
_{When the} speed is increased with respect to the rotation speed _{NL of the FL} , as shown by the hatched arrow in FIG. 3, a part of the torque of the left front wheel W _FL which is the turning inner wheel is partially shifted to the right front wheel W which is the turning outer wheel. Can be communicated to _FR . In this case, when accelerating the rotation speed of the carrier member 11 by appropriately adjusting the engagement force of the left electromagnetic clutch C _L, left front wheel W _FL rotation speed N _R of the right front wheel W _FR in accordance with the speed increasing The rotation speed is increased with respect to the rotation speed N _L , and an arbitrary torque can be transmitted from the left front wheel W _{FL as the} turning inner wheel to the right front wheel W _FR as the turning outer wheel. Thus, when the vehicle is running at a low speed, it is possible to improve the turning performance by transmitting a larger torque to the outer turning wheel than to the turning inner wheel. During high-speed running, it is possible to reduce the torque transmitted to the turning outer wheel as compared with the case of the medium-to-low speed running, or to improve the running stability by transmitting torque from the turning outer wheel to the turning inner wheel.

As is apparent from a comparison between the equations (1) and (2), the first pinion 13, the second pinion 14, the third pinion 15, the first sun gear 17, the second sun gear 18
And the number of teeth of by a set as described above third sun gear 19, the speed increasing ratio from the right front wheel W _FR to the left front wheel W _FL (about 1.143), increasing from the left front wheel W _FL to the right front wheel W _FR The speed factor (about 1.167) can be made substantially equal.

Next, left and right electromagnetic clutches C _L, the structure of the C _R will be described with reference to FIGS. 4-6.

The left and right electromagnetic clutches C _L and C _R disposed adjacent to the inside of the housing 20 made of a non-magnetic material such as an aluminum alloy are orthogonal to the axis _{L of the} left and right output shafts 9 _L and 9 _R. It has a symmetrical structure with respect to the symmetry plane P.

The left electromagnetic clutch C _L has a core 21 _L formed of a magnetic material in a substantially cylindrical shape.
_L is fitted to the inner peripheral surface of the cylindrical housing 20 and is fixed immovably in the circumferential and axial directions by bolts 22.
The interior of the core 21 _L coil 23 _L is buried. On the right side of the core 21 _L outer guide 24 _L and the inner guide 25 _L formed annularly magnetic material is arranged coaxially. Outer guide 24 _L has its outer peripheral surface is splined 26 _L immovably in the circumferential direction and the axial direction on the inner peripheral surface of the housing 20, inner guide 25 _L has its inner peripheral surface a third sun gear 19 (FIG. 1) and a spline connection _27L that is immovable in the circumferential and axial directions on the outer peripheral surface of the left end of the sleeve 28 integrated with the sleeve 28. At the right end face of the core 21 _L, in order to prevent the axial load is applied to the coil 23 _L, the pressure plate 29 _L formed annularly non-magnetic material comes in contact.

[0026] on the right side of the pressure plate 29 _L, while being spline-coupled movably circumferentially immovable but axially on the inner peripheral surface six outer disk 30 _L ... of the outer guide 24 _L, wherein the six The five inner disks 31 _L alternately superimposed on the outer disks 30 _L are spline-coupled to the outer peripheral surface of the inner guide 25 _{L so} as to be immovable in the circumferential direction and movable in the axial direction. And on the right side of the outer disk 30 _{L at} the right end,
An armature 32 formed of a magnetic material in an annular shape is arranged to be movable in the axial direction.

Similarly, the right electromagnetic clutch C _R has a core 21 _R formed of a magnetic material in a substantially cylindrical shape.
The core 21 _R is fitted to the inner peripheral surface of the cylindrical housing 20 and is fixed immovably in the circumferential and axial directions by bolts 22. The interior of the core 21 _R is buried the coil 23 _R is. The left core 21 _R outer guide 24 _R and the inner guide 25 _R formed annularly magnetic material is arranged coaxially. Outer guide 24 _R has its outer peripheral surface is immovably splined 26 _R on the inner peripheral surface in the circumferential direction and the axial direction of the housing 20, inner guide 25 _R is left outer periphery of the inner peripheral surface thereof a carrier member 11 Spline connection 2 that cannot move in the circumferential and axial directions on the surface
7 _R The left end surface of the core 21 _R, in order to prevent the axial load is applied to the coil 23 _R, the pressure plate 29 _R formed annularly non-magnetic material comes in contact.

The left side of the pressure plate 29 _R, while being spline-coupled movably circumferentially immovable but axially on the inner peripheral surface six outer disk 30 of the _R ... is the outer guide 24 _R, wherein the six five inner disk 31 _R superimposed alternately are circumferentially immovable but axially movably splined to the outer circumferential surface of the inner guide 25 _R relative to the outer disc 30 _R .... And the left side of the leftmost outer disk 30 _R, the armature 32 is disposed to be axially movable. That is, the armature 32 is disposed on the symmetry plane P and is shared by the left and right electromagnetic clutches C _L and C _R.

The outer disks 30 _L , 30 _R.
And the inner disk 31 _L ..., 31 _R ... is formed of a non-magnetic material such as stainless steel, while (e.g., inner disk 31 _L ..., 31 _R ...) on the surface of, its other (e.g., outer Disc 30 _L …, 3
0 _R ...) Is attached to the surface of the clutch facing (not shown).

[0030] housing 20 two flux density sensor mounting hole 20 ₁ through the, 20 _1, respectively the magnetic flux density sensor 41 _L, 41 _R are fitted and fixed from the outside. Detectors 41 ₁ , 41 ₁ containing a Hall element therein are provided at the tips of the magnetic flux density sensors 41, 41, and the detectors 41 ₁ , 41 ₁ are formed on the respective cores 21 _L , 21 _R. It fits in the recesses 21 ₁ , 21 ₁ .

[0031] In Thus, when power is supplied to the left electromagnetic clutch C _L in the coil 23 _L to engage with a command from the electronic control unit U, as shown by the broken line in FIG. 4, the core of magnetic material 21 _L,
Outer guide 24 _L, magnetic flux along the closed magnetic path composed of the armature 32 and the inner guide 25 _L is formed, the armature 32 is attracted to the left toward the coil 23 _L. As a result, the outer discs 30 _L ... And the inner discs 31 _L.
Are sandwiched between the pressure plates 29 _L and are in close contact with each other, the sleeve 28 integral with the third sun gear 19 is coupled to the housing 20, and the left electromagnetic clutch C _L is engaged.

Similarly, the finger from the electronic control unit U
By right electromagnetic clutch C_RCoil 23 to engage_RPaid
When electric power is applied, as shown by a broken line in FIG.
_R, Outer guide 24_R, Amateur 32 and in
Gnar guide 25_RMagnetic flux forms along a closed magnetic path consisting of
Amateur 32 is coil 23_RTurn right toward
Is sucked. As a result, it was pressed by the amateur 32
Outer disk 30 _R… And inner disk 31
_R… Is pressure plate 29_RBetween the mutual
And the carrier member 11 is connected to the housing 20.
Right electromagnetic clutch C_REngage.

[0033] Thus, by the excitation of the coil 23 _L of the left electromagnetic clutch C _L, or when the magnetic flux formed by the coil 23 _R excitation of the right electromagnetic clutch C _R, outer disk 30 _L ..., 30 _R ... and inner Disk 3
1 _L ..., 31 for _{the R} ... is composed of all non-magnetic material, these outer disk 30 _L ..., 30 _R ... and inner disk 31 _L ..., 31 to prevent a short circuit of magnetic flux through _R ... armature 32 Can be reliably sucked.

Left electromagnetic clutch C_LCoil 23_LExcitation
The armature 32 moves to the left by the
_L… And inner disk 31_L...
The left side of the amateur 32_L
And inner guide 25_LA slight gap between the right side
Have between. Also, right electromagnetic clutch C_RCoil 23
_RArmature 32 moves to the right by the excitation of
Sk30_R… And inner disk 31_R… The adhesion
The right side of the amateur 32
24_RAnd inner guide 25_RBetween the left side of
There is a gap in the dry. Therefore, the outer disk 30
_L…, 30_R… And inner disk 31_L…, 31
_RThe thrust of the amateur 32 can be reliably transmitted to ...
Wear.

By using the inner disk 31 _{L for a} long time
..., 31 the gap between _R ... clutch facings affixed to the wear is reduced gradually, the left side surface of the armature 32 when the excitation of the coil 23 _L is in close contact with the right side surface of the outer guide 24 _L and inner guide 25 _L, also coil right side of the armature 32 comes into close contact with the left side surface of the outer guide 24 _R and the inner guide 25 _R when the excitation of the 23 _R. Therefore, if the gap is set to disappear before the clutch facing is completely worn, the outer discs 30 _L, ..., 30 _R, and the inner discs 31 _{L. R} ... is prevented from causing a burn are pressed against each other.

As described above, the left and right front wheels W_FL, W_FRwhile
The torque distributed by the left and right electromagnetic clutch C_L, C_Rof
Since it is determined by the fastening force, the left and right front wheels W_FL, W_FRwhile
In order to distribute the desired torque, the left and right electromagnetic clutches C
_L, C_RDetects the fastening force that is actually occurring, and
Coil 23 based on binding force_L, 23_ROf current supplied to
It is necessary to feedback control the duty ratio. So
And left and right electromagnetic clutch C_L, C_RThe fastening force of the amateur
A depends on the axial thrust acting on the
Thrust is coil 23_L, 23_RDepends on the magnetic flux density
I do. Therefore, the left coil 23_LGenerated magnetic flux density
To detect the left electromagnetic clutch C _LCheck the fastening force of
The right coil 23_RGenerated magnetic flux
The right electromagnetic clutch C is detected by detecting the density._RFastening force
Can be detected.

The magnetic flux density is determined by the magnetic flux density sensors 41 _L , 4
1 _R is detected as follows. Explaining the left electromagnetic clutch C _L , the coil 23 _L is excited to form a main magnetic flux along a closed magnetic path including the magnetic core 21 _L , the outer guide 24 _L , the armature 32 and the inner guide 25 _L. when, leakage flux of a size correlated to the magnetic flux density is generated in the recess 21 in _one of the core 21 _L. Accordingly, by detecting the magnitude of the leakage magnetic flux in the hall element provided in the detecting portion 41 ₁ of the magnetic flux density sensor 41 _L to be fitted into the recess 21 _1, it is possible to know the flux density of the main magnetic flux.

As described above, since the left and right electromagnetic clutches C _L and C _R arranged adjacently share one armature 32, compared to the case where the left and right electromagnetic clutches C _L and C _R are provided with an armature, respectively. Thus, the number of parts and cost can be reduced. Moreover left and right electromagnetic clutches C _L, C _R is intended to selectively engage, because both the electromagnetic clutches C _L, C _R coil 23 _L, 23 _R of not be energized at the same time, sharing the armature 32 left and right electromagnetic clutches C _L be, fear does not hinder the operation of the C _R.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the driving force distribution device according to the present invention is not limited to a device for distributing driving force between left and right wheels, but may be a device for distributing driving force between front and rear wheels. Further, the present invention can be applied to a system in which braking force is distributed between left and right wheels or between front and rear wheels.

[0041]

As described above, according to the first aspect of the present invention, a common armature is disposed between the first and second electromagnetic clutches, and the first coil is excited to move the armature in one direction. To engage the first frictional engagement member,
Since the armature is excited to move the armature in the other direction to engage the second frictional engagement member, the number of armatures can be minimized and the number of parts can be reduced. Moreover, since the first and second electromagnetic clutches are not engaged at the same time, the operation of the first and second electromagnetic clutches does not hinder even if the number of amateurs is one.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a driving force distribution device.

FIG. 2 is a diagram showing the operation of the driving force distribution device during a right turn in a middle to low vehicle speed range.

FIG. 3 is a diagram showing the operation of the driving force distribution device during a left turn in a middle-low vehicle speed range;

FIG. 4 is an enlarged view of a main part of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

[Description of Signs] 9 _L left output shaft (one shaft) 9 _R right output shaft (other shaft) 23 _L coil (first coil) 23 _R coil (second coil) 30 _L outer disk (first friction member) Joint member) 30 _R outer disk (second friction engagement member) 31 _L inner disk (first friction engagement member) 31 _R inner disk (second friction engagement member) 32 amateur C _L left electromagnetic clutch (first electromagnetic member) Clutch) C _R right electromagnetic clutch (second electromagnetic clutch)

Continued on the front page (72) Inventor Takashi Kuribayashi 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Inventor Tatsuhiro Tomi 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Inside Honda R & D Co., Ltd. (72) Inventor Hiromi Inagaki 1-4-1, Chuo, Wako-shi, Saitama Prefecture Co., Ltd. Inside Honda R & D Co., Ltd. (72) Masakazu Hori 1-4-1, Chuo, Wako-shi, Saitama Co., Ltd. Inside Honda R & D Co., Ltd. (72) Inventor Tomoyuki Niimura 1-4-1 Chuo, Wako-shi, Saitama Prefecture Co., Ltd. Inside Honda R & D Co., Ltd. (72) Kazuhiro Wada 1-4-1 Chuo Wako-shi, Saitama Co., Ltd. F term in Honda R & D Co., Ltd. (reference) 3D036 GA42 GB09 GC03 GD08 GH05 GJ02 3D039 AA00 AB01 AC07 AC24

Claims (1)

[Claims] 1. An axis (9)_L) To the other axis (9_R)
Electromagnetic clutch (C) that transmits torque to the_L) And the other
Axis (9_R) To one axis (9_LTransmit torque to
Second electromagnetic clutch (C_R), And the first and second electromagnetic
Latch (C_L, C_R) To selectively operate the two shafts
(9_L, 9_RTo the driving force distribution device that distributes torque between
In addition, the first electromagnetic clutch is provided on one side of the common armature (32).
(C_L) First frictional engagement member (30)_L, 31_L)and
The first coil (23_L) And the amateur
A The second electromagnetic clutch (C_R) No. 2
Friction engagement member (30 _R, 31_R) And the second coil (23)
_R), And the first coil (23)_L)
Move amateur (32) in one direction and engage in first friction
Members (30 _L, 31_L) Is engaged, and the second coil (23
_R), The armature (32) is moved in the other direction.
To move the second frictional engagement member (30_R, 31_REngaged)
The electromagnetic force in the driving force distribution device.
Latch structure.