JP2000081054A - Electromagnetic clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch device improved so as not to occur the seizure, even if a facing is worn, without generating a metal sound and judder at the connection time of a clutch. SOLUTION: In an electromagnetic clutch device having an outer disc 14 joined to one shaft, an inner disc 13 joined to the other shaft and an electromagnet 15 for press-contacting them mutually and an armature 25, the outer disc is composed of the outer periphery part 14a of a magnetic material, the intermediate part 14b of a non-magnetic material and the inner periphery part 14c of the magnetic material and the inner disc is composed of the inner periphery part 13c of the magnetic material, the intermediate part 13b of the non-magnetic material and the outer periphery part 13a of the magnetic material and when the electromagnet is magnetized, the intermediate parts of outer/inner both discs are contacted with each other and the power is transmitted. Thereby, the friction press-contact part for transmitting the torque can be formed by the non-magnetic material without affecting to the magnetic path area exhibiting the combination force as the electromagnetic clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch device for intermittently transmitting power transmitted between two shafts with magnetic attraction.

[0002]

2. Description of the Related Art As a means for intermittently transmitting power transmitted between two shafts, an electromagnetic clutch device utilizing magnetic attraction is known. In a conventional electromagnetic clutch device, the clutch plate is formed of a magnetic material such as carbon tool steel (SK material) because of a desire to achieve both high magnetic permeability and high rigidity.

[0003]

According to the conventional electromagnetic clutch in which the clutch plate is made of steel, a connection with smooth sliding cannot be made, so that a judder is generated or a metallic noise is generated when the clutch is connected. There was something. It is also known that the clutch facing made of resin or fiber is attached to the clutch plate.However, if the facing is worn, the metal plates will come into direct contact with each other. There was a fear.

[0004] The present invention has been made to solve such disadvantages of the prior art, and its main purpose is to prevent the generation of metallic noise or judder when the clutch is connected, and furthermore, the facing is worn out. Another object of the present invention is to provide an electromagnetic clutch device improved so as not to cause image sticking.

[0005]

In order to achieve the above object, according to the present invention, an outer disk (14) coupled to one of two shafts so as to be axially displaceable and not to be displaceable in a circumferential direction. And an inner disk (13) coupled to the other so as to be axially displaceable and not to be displaceable in the circumferential direction.
And an electromagnetic clutch device having electromagnetic attraction means (electromagnet 15 and armature 25) for pressing the outer and inner disks against each other. The outer disk includes an outer peripheral portion (14a) made of a magnetic material, and an outer peripheral portion. To the intermediate portion (14) made of a non-magnetic material
b), and an inner peripheral portion (14c) made of a magnetic material capable of being displaced in the circumferential direction with respect to the intermediate portion. The inner disk is provided with an inner peripheral portion (13c) made of a magnetic material and an inner peripheral portion. In contrast, the intermediate portion (13) made of a non-magnetic material
b) and an outer peripheral portion (13a) made of a magnetic material capable of being displaced in the circumferential direction with respect to the intermediate portion. When the electromagnetic attraction means is excited, the intermediate portions of both the outer and inner disks come into contact with each other to generate power. Communication was to be made.

According to this, the friction welding portion for transmitting the torque without affecting the magnetic path area for exerting the coupling force as the electromagnetic clutch can be formed of a non-magnetic material.

In particular, a facing material (27) is provided on at least one of the intermediate portions, and the total thickness of the intermediate portion including the facing material is made larger than the total thickness of the portion formed of the magnetic material. If the total thickness of the portion excluding the facing material at the intermediate portion is smaller than the total thickness of the portion formed of the magnetic material, torque transmission is not performed at the wear limit of the facing material. Can be

Further, if the axial end face of the coil of the electromagnetic attraction means is covered with a highly rigid member (cover plate 29) made of a non-magnetic material in order to receive an axial load acting upon excitation, the non-magnetic material An axial load applied to the portion can be prevented from acting on the coil.

In addition to the above, the inner peripheral portion of the outer disk and the inner peripheral portion of the inner disk are integrated (disc guide inner 31), and the outer peripheral portion of the outer disk and the outer peripheral portion of the inner disk are integrated (disc). Guide outer 3
In the case of 2), the accumulation of dimensional errors due to the lamination of the portions made of the magnetic material is eliminated, and the dimensional accuracy of the magnetic material portion is increased, so that the clearance accuracy of the non-magnetic material portion can be easily managed.

Further, since the oil passages (33, 34) can be easily provided in the magnetic material portion even if the magnetic material portion is integrated, lubricating oil can be supplied to the friction welding portion made of a non-magnetic material. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 shows, as an application example of the electromagnetic clutch device according to the present invention, a torque distribution device for variably controlling a distribution ratio of engine torque transmitted to left and right drive wheels. This torque distribution device T includes a planetary gear mechanism P,
It consists of a speed increasing clutch Ca and a deceleration clutch Cd, each of which is an electromagnetic wet multi-plate clutch.

The planetary gear mechanism P includes a planetary carrier 3 rotatably supported by a casing 2 while surrounding an output shaft 1 connected to one of the right and left driving wheels,
A plurality (for example, four) of the first pinion 4, the second pinion 5, and the third pinion 6 integrally formed and supported at equal intervals on a circumference concentric with the center of the planetary carrier 3. A triple pinion member 7, a first sun gear 8 pivotally attached to the outer periphery of the output shaft 1 and meshing with the first pinion 4, and spline-coupled to the outer periphery of the output shaft 1 at a position adjacent to the left side of the first sun gear 8. The third sun gear 9 meshing with the third pinion 6 integrally with the clutch inner holding member 10 of the speed increasing clutch Ca pivotally mounted on the outer periphery of the output shaft 1. It consists of 11.

Here, the first sun gear 8 is integrally connected to the left end of a sleeve 12 which is spline-connected to the planetary carrier 3 of the differential (not shown), and the planetary carrier 3 and the other connected thereto. It is designed to rotate integrally with the output shaft.

The speed increasing clutch Ca has an inner disk 13 engaged with a clutch inner holding member 10 pivotally mounted on the output shaft 1 so as to be non-peripherally displaceable and axially displaceable.
And an outer disk 14 engaged with the inner surface of the casing 2 so as to be non-displaceable in the circumferential direction and displaceable in the axial direction, and pressed against each other by an axial attracting force of an electromagnet 15 provided on the casing 2. Clutch inner holding member 1
The function of restraining the rotation of the third sun gear 11 integrated with the first sun gear 11 is exhibited.

The deceleration clutch Cd is formed between an inner disk 17 engaged with a clutch inner holding portion 16 formed on the planetary carrier 3 so as not to be displaceable in the circumferential direction and displaceable in the axial direction, and to an inner surface of the casing 2. Outer disk 1 engaged so as not to be displaceable in the circumferential direction and displaceable in the axial direction
8 are pressed against each other by an axial attraction force of an electromagnet 19 provided in the casing 2. Exerts the effect of restraining

The speed increasing clutch Ca and the speed decreasing clutch Cd are provided with electromagnets 15 and 19 in accordance with the vehicle speed and the steering angle.
The coupling force is controlled by controlling the exciting current to be applied to the motor. By controlling the coupling force, the distribution ratio of the engine torque transmitted to the left and right drive wheels via the differential device is controlled. This torque distribution ratio control is not directly related to the essence of the present invention.
It is described in detail in, for example, Japanese Patent Application Laid-Open No. 0738, and the detailed description is omitted here.

Next, the electromagnetic clutch device according to the present invention will be described with reference to FIGS.
This will be described in more detail with reference to FIG.

This electromagnetic clutch device is provided with an electromagnet 15 having a coil 21 built therein and comprising a field core 22 fixed to the casing 2 and a spline hole 23 formed on the inner peripheral surface of the casing 2 so as to be movable in the axial direction. The outer disc 14 joined alternately and the inner disc 13 joined to the serration shaft 24 formed on the outer peripheral surface of the clutch inner holding member 10 so as to be movable in the axial direction are alternately overlapped.
An armature 25 is mounted in the casing 2 movably in the axial direction opposite to the axial end face of the field core 22 with the inner disks 13 and 14 interposed therebetween. The maximum amount of movement of the armature 25 in the axial direction is defined by a stop ring 26 or the like.

The outer disk 14 has an outer peripheral portion 14a made of a magnetic material such as carbon steel, and an intermediate portion 14b made of a non-magnetic material such as stainless steel joined to the outer peripheral portion 14a so as not to be displaceable in the circumferential direction. And an inner peripheral portion 14c made of a magnetic material that can be displaced in the circumferential direction with respect to the intermediate portion 14b. The inner disk 13 has an inner peripheral portion 13 made of the same magnetic material as the outer peripheral portion 14a of the outer disk.
c, an intermediate portion 13b made of the same non-magnetic material as the intermediate portion 14b of the outer disk and coupled to the inner peripheral portion 13c so as not to be displaceable in the circumferential direction. And an outer peripheral portion 13a made of a material.

Either one of the intermediate portions 13b and 14b (in this embodiment, the inner side) made of a non-magnetic material of the outer and inner disks is the same as that used in a conventional wet multi-plate clutch. The clutch facing 27 is stuck. The thickness of the intermediate portions 13b and 14b including the clutch facing 27 is larger than the thickness of the portion made of the magnetic material, but the thickness of the non-magnetic material except the clutch facing 27 is the same as the thickness of the magnetic material. Is smaller than the thickness dimension.

On the opening surface of the coil receiving portion 28 of the field core 22, a doughnut-shaped cover plate 2 made of a non-magnetic material and having high rigidity is provided.
9 is fixed so that no axial force is applied to the axial end surface of the coil 21.

In the demagnetized state of the coil 21, no electromagnetic attraction force acts, and as shown in FIG. 4, the field core 22 and the intermediate portions 13b and 14 of the outer and inner disks.
b and the armature 25 are separated from each other in the axial direction, and the clutch is in the released state. Where the outer
If the ring 30 made of an elastic material such as a rubber material is interposed between the inner disks 22 and 23, the outer and inner disks 22 and 23 can be completely separated by the resilience.

When the coil 21 is energized, the field core 22,
Magnetic material portions 13a and 13c of both outer and inner disks
Magnetic flux passing through the armature 25 and the outer and inner disks 13a, 13c and 1 is formed as shown in FIG.
The magnetic cores 4a and 14c are attracted to the field core 22, and the middle portions 13b and 14b of the outer and inner disks are pressed against each other to bring the electromagnetic clutch into a coupled state.

Here, when the clutch facing 27 is not worn, as described above, the two intermediate portions 13b and 14b
Since the total thickness including the clutch facing 27 is set to be larger than the total thickness of the portion made of the magnetic material, the magnetic material portions 13a, 13c, 14a, and 14c do not directly contact each other, The clutch is connected via the air gap. In this state, the nonmagnetic material portion 13b
The pressure contact force acting on the coil 14b is received by the nonmagnetic cover plate 29 covering the end face of the coil, so that no axial force is applied to the coil 21 and the coil 21 is not likely to be damaged.

When the clutch facing 27 reaches the wear limit, the total thickness of the non-magnetic material portion excluding the clutch facing 27 is set to be smaller than the total thickness of the magnetic material portion as described above. As shown in FIG. 6, the magnetic material portions 13a, 13c, 14a, and 14c come into direct contact with each other. In this state, the inner peripheral portion 14c of the outer disk is separated from the intermediate portion 14b, and the outer peripheral portion 13a of the inner disk is also separated from the intermediate portion 13b. Of the outer disc 13 and the inner disc 13c of the inner disc do not contribute to torque transmission at all. This allows
Despite the excitation, torque transmission between the two shafts is not performed (in the case of this embodiment, the restraining force on the clutch inner holding member 10 does not work). There is no risk of burning.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described in detail with reference to FIG. Note that parts common to the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, a disk guide inner 31 in which the inner peripheral portion 13c of the inner disk and the inner peripheral portion 14c of the outer disk in the first embodiment are formed integrally is formed of a magnetic material. This is connected to the serration shaft 24 of the clutch inner holding member 10 so as to be freely movable in the axial direction.
The disk guide outer 32 is formed of a magnetic material, and is integrally formed with the spline hole 23 of the casing 2 so as to be movable in the axial direction.

Then, the intermediate portion 13b of the inner disk in the first embodiment is coupled to the outer peripheral surface of the disk guide inner 31 so as not to be displaceable in the circumferential direction, and the intermediate portion 14b of the outer disk is connected to the inner periphery of the disk guide outer 32. It is connected to the surface so that it cannot be displaced in the circumferential direction.

Further, oil passages 33 and 34 penetrating in the radial direction are provided at the axially intermediate portions of the disk guide inner 31 and the disk guide outer 32. In addition,
The oil passages 33 and 34 may be provided in an appropriate number at equal angular intervals as desired.

Also in this embodiment, when the clutch facing 27 is not worn, the two intermediate portions 13b
Since the total thickness of the portion including the clutch facing 27 of 14b is set to be larger than the axial dimension of the disk guide inner 31 and the disk guide outer 32, when the armature 25 is attracted to the electromagnet 15, the electromagnet 15 or The clutch is engaged with an appropriate gap G between the end face of the armature 25 and the end faces of the disc guide inner 31 and the disc guide outer 32 (see FIG. 9).

When the clutch facing 27 reaches the wear limit, the total thickness of the intermediate portions 13b and 14b excluding the clutch facing 27 is set smaller than the axial size of the disc guide inner 31 and the disc guide outer 32. Therefore, as shown in FIG. 10, the opposed end faces of the electromagnet 15 and the armature 25, the disk guide inner 31, and the disk guide outer 32
The clutch is coupled in a state where both end faces are in close contact with each other. In this state, the dimension between the opposing end faces of the electromagnet 15 and the armature 25 is defined by the axial dimension of the disk guide inner 31 and the disk guide outer 32, so that no pressure contact force acts on the clutch facing 27. There is no danger.

[0033]

As described above, according to claim 1 of the present invention,
Since the friction pressure contact portion for transmitting the torque without affecting the magnetic path area exerting the coupling force as the electromagnetic clutch can be formed of a non-magnetic material, connection noise and clutch judder do not occur.

According to the second aspect, when the clutch facing reaches the wear limit, torque transmission to the clutch facing is not performed by the magnetic material portion.
This is effective in eliminating the risk of burning.

According to the third aspect, the axial load applied to the non-magnetic material portion can be prevented from acting on the coil, which is effective for protecting the coil.

According to the fourth aspect, since the accumulation of dimensional errors due to the lamination of the portions made of the magnetic material can be eliminated and the dimensional accuracy of the magnetic material portion can be improved, the clearance accuracy of the non-magnetic material portion can be improved. It is effective.

According to the fifth aspect, even if the magnetic material portion is integrated, the lubrication of the friction welding portion made of the non-magnetic material can be maintained by providing the oil passage.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a driving force distribution device to which the present invention is applied.

FIG. 2 is a partial cross-sectional view in the axial direction of the electromagnetic clutch device according to the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a conceptual diagram showing a clutch released state;

FIG. 5 is a conceptual diagram showing a clutch engagement state.

FIG. 6 is a conceptual diagram showing a clutch engagement state when the clutch facing is worn.

FIG. 7 is a partial cross-sectional view of another embodiment of the electromagnetic clutch device according to the present invention.

8 is a sectional view taken along the line VIII-VIII in FIG. 7;

FIG. 9 is a conceptual diagram showing a clutch engagement state of another embodiment.

FIG. 10 is a conceptual diagram showing a clutch engagement state in a state where the clutch facing of another embodiment is worn.

[Explanation of symbols]

 13 inner disk 13a outer peripheral portion, 13b intermediate portion, 13c inner peripheral portion 14 outer disk 14a outer peripheral portion, 14b intermediate portion, 14c inner peripheral portion 15 electromagnet 25 armature 27 clutch facing 29 cover plate 31 disk guide inner 32 disk guide outer 33 ・34 Oilway

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuhiko Masuda, Inventor 1-4-1 Chuo, Wako, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Hiroshi Masumoto 1-4-1, Chuo, Wako, Saitama Prefecture No. In Honda R & D Co., Ltd.

Claims (5)

[Claims] An outer disk coupled to one of two shafts so as to be axially displaceable and not to be displaceable in a circumferential direction,
An electromagnetic clutch device having an inner disk coupled axially displaceable and circumferentially non-displaceable with respect to the other, and an electromagnetic attraction means for pressing the outer and inner disks against each other, wherein the outer disk comprises: An outer peripheral portion made of a magnetic material, an intermediate portion made of a non-magnetic material that cannot be displaced in the circumferential direction with respect to the outer peripheral portion, and an inner peripheral portion made of a magnetic material that can be displaced in the circumferential direction with respect to the intermediate portion. Wherein the inner disk has an inner peripheral portion made of a magnetic material, an intermediate portion made of a non-magnetic material that cannot be displaced in the circumferential direction with respect to the inner peripheral portion, and a circumferentially displaceable portion with respect to the intermediate portion. An electromagnetic clutch device comprising: an outer peripheral portion made of a magnetic material; and when the electromagnetic attraction means is excited, the intermediate portions of the outer and inner disks come into contact with each other to transmit power. 2. A facing material is provided on at least one of the intermediate portions, and a total thickness of a portion of the intermediate portion including the facing material is a total thickness of a portion formed of the magnetic material. The total thickness of a portion of the intermediate portion excluding the facing material is made smaller than the total thickness of a portion formed of the magnetic material. Electromagnetic clutch device as described. 3. The coil according to claim 1, wherein an axial end face of the coil of the electromagnetic attraction means is covered with a high-rigidity member made of a non-magnetic material to receive an axial load acting upon excitation. Electromagnetic clutch device as described. 4. An inner disk according to claim 1, wherein said inner peripheral portion of said outer disk and said inner peripheral portion of said inner disk are integrally formed, and said outer peripheral portion of said outer disk is integrally formed with said outer peripheral portion of said inner disk. The electromagnetic clutch device according to claim 1, wherein: 5. The electromagnetic clutch device according to claim 4, wherein an oil passage penetrating in a radial direction is provided in the magnetic material portion.