JP2003056599A - Solenoid-controlled pilot type clutch device and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid-controlled pilot type clutch device and a manufacturing method therefor, capable of keeping stable condition of a housing subassembly in a case, and reducing the manufacturing cost by reducing manufacturing time, even when the overall length of the housing subassembly in which a main clutch, a pilot clutch, a cam-type amplifier system, a yoke and the like are assembled at the housing varies. SOLUTION: A shim, having thickness corresponding to dimensions between a reference surface in a rotational axis direction of the housing integrated and connected with one side shaft and a yoke end surface assembled to the housing with the main clutch, the pilot clutch, and the cam type amplifier system, is interposed in between the yoke end surface and a bottom part of an engagement hole, which is formed at a rear case, engaged with and supports the yoke, so that variations in bound force of a disc spring intervened in between the shim and the yoke end surface lie within the allowed range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pilot type clutch device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a housing sub-assembly has been constructed by sequentially assembling a main clutch, a cam type amplifying mechanism, a pilot clutch, a rear housing, a yoke having an electromagnet attached to a housing housed in a case of a clutch device. There is. However, due to dimensional errors and assembly errors of the components, the total length from the reference surface at one end of the housing to the end surface of the yoke protruding from the other end varies.

[0003]

In the housing sub-assembly of the above-mentioned conventional electromagnetic pilot clutch device,
If the housing sub-assembly is assembled with such variations, the variation of the repellency of the disc spring interposed between the rear case part and the end surface of the yoke may not be within the allowable range. When the housing sub-assembly vibrates inside and the repellency is strong, there is a problem that excessive preload is applied to the bearings and the like. In order to solve such a problem, in the past, the reference surface of the housing was ground to make the entire length of the housing sub-assembly a predetermined length. Since the housing sub-assembly is assembled to grind the reference surface of the housing in order to make the entire length a predetermined length, there is a problem that the manufacturing cost becomes high, such as a long manufacturing time.

[0004]

In order to solve the above-mentioned problems, the constitutional features of the present invention as set forth in claim 1 are as follows. One of the shafts is rotatably supported by the case on the axis of rotation, and the inside of the case. A housing having a clutch storage chamber formed therein and integrally connected to the one shaft, and the other shaft that is rotatably supported on the rotation axis so as to face the one shaft in the case. A rotary member that is rotatably supported by the housing, extends into the clutch housing chamber, and is rotatably connected to the other shaft, and engages with the circumferential surface of the clutch housing chamber such that relative rotation is restricted and movable in the axial direction. A main outer clutch plate and a main inner clutch plate which is alternately arranged with the main outer clutch plate and whose rotation is restricted by the rotating member and which is movably engaged in the axial direction. The main clutch, the pilot outer clutch plate which is engaged with the circumferential surface of the clutch housing chamber so as to be restricted in relative rotation and movably in the axial direction, and the pilot outer clutch plate which is alternately arranged and relatively rotates in the first cam member. And a large-diameter rear housing part fixed to the opening of the housing and the rotating member are rotatably supported. The small-diameter rear housing part is integrally connected by a non-magnetic annular intermediate member at a position facing the armature with the pilot clutch interposed therebetween, and the armature is arranged between the large-diameter and small-diameter rear housing parts. The pilot outer clutch plate and An electromagnet for press-contacting a clutch plate is fixedly attached, the small-diameter rear housing portion is rotatably supported by a bearing, and the yoke is fitted and supported by the case and is prevented from rotating. The second cam member is in contact with the main clutch. A cam type in which the second cam member is moved in the axial direction by the operation of the cam mechanism by the relative rotation with the first cam member, and the main clutch is pressure-contacted by amplifying the transmission torque of the pilot clutch based on the attraction of the electromagnet. In an electromagnetic pilot clutch device having an amplifying mechanism and a spring for urging the second cam member in a direction to disengage the main clutch, a rotation axis direction of the housing integrally connecting the housing to the one shaft. A shim having a thickness corresponding to the dimensions of the reference surface of the yoke and the end surface of the yoke is formed in the case. This is to allow the fluctuation of the repulsive force of the disc spring interposed between the bottom end of the fitting hole for fitting and supporting the hook and the end face of the yoke to be within the allowable range. .

According to a second aspect of the present invention, in the electromagnetic pilot clutch device according to the first aspect, the case includes a main body portion for housing the housing and a rear case portion for supporting the other shaft. That is, the fitting hole is formed in the rear case portion by dividing the yoke at a portion facing the yoke.

According to a third aspect of the invention, there is provided a method of manufacturing an electromagnetic pilot clutch device according to the first or second aspect, wherein the clutch storage chamber is formed in the housing, and the housing. A rotary member rotatably supported by the clutch member and extending into the clutch housing chamber; a main outer clutch plate engaged with the circumferential surface of the clutch housing chamber so as to be relatively rotatable and axially movable; and a main outer member. A main clutch that includes a main inner clutch plate that is alternately arranged with the clutch plate and that is regulated in rotation by the rotating member and is movably engaged in the axial direction, and relative rotation is regulated in the clutch storage chamber inner peripheral surface. Outer clutch plate and a pilot outer clutch plate engaged movably in the axial direction A pilot clutch provided with a pilot inner clutch plate that is disposed mutually and is regulated in relative rotation by the first cam member and movably engaged in the axial direction; and a large-diameter rear housing fixed to the opening of the housing. Part and a small-diameter rear housing part that rotatably supports the rotating member are integrally connected by a non-magnetic annular intermediate member at a position facing the armature with the pilot clutch interposed therebetween, and the large-diameter and An electromagnet, which is arranged between the small-diameter rear housing parts and sucks the armature to press the pilot outer clutch plate and the pilot inner clutch plate into pressure contact with each other, is fixed and rotatably supports the small-diameter rear housing part by bearings and rotates around the case. The yoke that is stopped and fitted and supported, and the main clutch The second cam member is moved in the axial direction by the operation of the cam mechanism by the relative rotation between the second cam member and the first cam member which are in contact with each other, and the main clutch is amplified by the transmission torque of the pilot clutch based on the attraction of the electromagnet. A housing type sub-assembly including a cam type amplifying mechanism that is pressed against each other and a spring that biases the second cam member in a direction to disengage from the main clutch, with a reference surface of the housing being in contact with a measurement reference surface,
The dimension from the measurement reference plane to the end surface of the yoke is measured, and the thickness of the shim is selected based on the measured value.

[0007]

In the invention according to claim 1 configured as described above, the thickness corresponding to the dimensions of the reference surface of the housing integrally connected to the one shaft in the direction of the rotation axis and the end surface of the yoke is set. The shim that is provided is interposed between the bottom end of the fitting hole formed in the case for fitting and supporting the yoke and the yoke end surface, and variations in the repulsive force of the disc spring interposed between the shim and the yoke end surface are prevented. Since it is set within the allowable range, even if there are variations in the total length from the reference surface at one end of the housing to the end surface of the yoke protruding from the other end due to dimensional errors and assembly errors of the components assembled in the housing. The housing sub-assembly can be housed in the case in a stable state, vibration of the housing sub-assembly in the case that occurs when the repulsive force is weak is prevented, and the bearing sub-assembly that is generated when the repulsive force is strong can be prevented. It can be smoothly supporting the housing sub ASSY prevent such preload. Further, since it is not necessary to perform processing for making the entire length of the housing sub-assembly a predetermined length, the manufacturing cost can be reduced.

In the invention according to claim 2 having the above-mentioned structure, the case is divided into a main body portion for housing the housing and a rear case portion for supporting the other shaft at a portion facing the yoke and is formed in the rear case portion. Since a shim is inserted in the fitting hole that fits and supports the yoke, a shim with an appropriate thickness selected can be easily inserted in the fitting hole when the housing sub-assembly is assembled to the case. The manufacturing time of the clutch device can be shortened.

In the invention according to claim 3 configured as described above, the reference surface of the housing of the housing sub-assembly is brought into contact with the measurement reference surface, and the dimension from the measurement reference surface to the yoke end surface is measured and measured. Since the shim is selected based on the value, the shim having an appropriate thickness can be surely selected, and the manufacturing time of the clutch device can be shortened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electromagnetic pilot clutch device and a method of manufacturing the same according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an electromagnetic pilot clutch device 10, which is mounted on the vehicle body of a vehicle such as a motorcycle. The case 11 is composed of a case body 11a and a rear case 20 which is divided at a portion facing a yoke 36, which will be described later. The rear case 20 has a fitting hole 52 as shown in FIG. An annular shim 48 and a disc spring 49 having a predetermined thickness according to the present invention are interposed in the bottom portion 50 in the hole 52, the yoke 36 is fitted and supported, and a housing sub-assembly 41 described later is supported in a stable state. It The rear case 20 is fixed to the case body 11a with a plurality of bolts 30.

Inside the case 11, the clutch oil 1
An oil chamber 12 in which 9 is stored is provided. A housing 13 is rotatably supported in the oil chamber 12, and a plurality of connecting holes 4 are formed in the peripheral wall of the housing 13.
The clutch oil 19 can be circulated in the oil chamber 12 and the clutch storage chamber 14 described later by 6 and 47.

As shown in FIG. 3, the opening of the housing 13 has a stepped cylindrical large-diameter rear housing portion 38.
Is screwed onto the inner peripheral surface of the housing 13, and a small-diameter rear housing portion 37 having a stepped cylindrical shape rotatably supports an inner shaft 15 described later so as to be large-diameter rear housing portion 3
8, a ring-shaped intermediate member 39 made of stainless steel is arranged at a predetermined distance from the rear housing portion 3 having a small diameter and a large diameter.
It is arranged in the middle of 7, 38 and fixed by welding. A rear housing 57 is formed by the intermediate member 39 and the small-diameter and large-diameter rear housing parts 37, 38 to cover the opening of the housing 13, and the outer peripheral end of the large-diameter rear housing part 38 is double nut 56 or welded or caulked. It is fixed to the housing 13 by the above. The small-diameter and large-diameter rear housing parts 37, 38 are made of a magnetic material, and the intermediate member 3
Since 9 is a non-magnetic material, it has a structure in which magnetic flux is easily formed by the electromagnet 33 described later.

A reference surface 22 on the front side of the housing 13.
An input shaft 21, which is a one-sided shaft rotatably supported by a bearing 27, is integrally fixed by a plurality of bolts 29. A stepped tubular inner shaft 15 as a rotating member extends along the axis of rotation in the clutch housing chamber 14, and the inner shaft 15 is rotatable in the housing 13 via a bearing 24 and a needle bearing 25. Is supported by. The output shaft 23, which is the other shaft, is rotatably supported on the case 11 by a bearing 26. An outer spline 53 is formed at the tip of the output shaft 23 and is formed at the rear end opening of the inner shaft 15. The inner spline 54 is spline-fitted and rotationally coupled so that torque can be transmitted. Annular oil seals 59 and 60 for preventing the clutch oil 19 from leaking from the inside of the oil chamber 12 to the outside are attached to the outer peripheries of the input shaft 21 and the output shaft 23.

Inside the clutch storage chamber 14, a main clutch 16, a cam type amplification mechanism 18 and a pilot clutch 3 are provided.
4 etc. are arranged. The main clutch 16 is a wet multi-plate friction clutch, and includes a plurality of main inner clutch plates 31 and a plurality of main outer clutch plates 32.
Is equipped with. Each main inner clutch plate 31
Is fitted to the outer periphery of the inner shaft 15 by spline fitting so as to be movable in the axial direction. Each main outer clutch plate 32 is assembled so as to be movable in the axial direction by spline fitting to spline teeth formed on the inner peripheral surface of the clutch housing chamber 14 of the housing 13. The main inner clutch plates 31 and the main outer clutch plates 32 are alternately arranged. When engaged, they come into frictional engagement with each other, and when disengaged, they are separated from each other and are in a disengaged state.

The cam type amplification mechanism 18 includes the main clutch 1
6 and the rear housing 57, the first cam member 44, the second cam member 45, and the plurality of cam followers 4 are interposed.
It consists of 0. The first cam member 44 is located on the radially inner side of the pilot clutch 34, which will be described later, in a state of being rotatably fitted to the outer periphery of the inner shaft 15. The second cam member 45 is located between the first cam member 44 and the armature 35 and the main clutch 16 in a state of being spline-fitted to the outer periphery of the inner shaft 15. The second cam member 45 and the shoulder portion 58 of the inner shaft 15
A spring 55 is interposed between and, and the second cam member 45 is urged in the direction of being disengaged from the main clutch 16 by the repulsive force of the spring 55.

The pilot clutch 34 includes an electromagnet 33,
It is disengaged by the operation of the yoke 36, the armature 35, and the rear housing 57 described above. The electromagnet 33 has an annular shape and has an intermediate member 39, a small-diameter and a large-diameter rear housing part 3.
It is arranged at a position surrounded by 7, 38 and is fitted to the yoke 36. The yoke 36 is rotatably supported by the bearing 28 between the small-diameter and large-diameter rear housing parts 37, 38 while maintaining a small gap with the small-diameter rear housing part 37, and the radial protrusion 36a is engaged with the case body 11a. York 3
The rotation of 6 is restricted. Pilot clutch 34
Is composed of a pilot outer clutch plate 42 and a pilot inner clutch plate 43. Each pilot outer clutch plate 42 is spline-fitted to a spline tooth formed on the inner peripheral surface of the clutch housing chamber 14 so as to be movable in the axial direction. The pilot inner clutch plate 43 is spline-fitted to the outer periphery of the first cam member 44 so as to be movable in the axial direction. The armature 35 has an annular shape, and the clutch storage chamber 1
4 is fitted to the inner peripheral surface by a spline so as to be movable in the axial direction, and is arranged at a position facing the intermediate member 39 with the pilot clutch 34 interposed therebetween.

In the method of manufacturing the electromagnetic pilot clutch device 10 constructed as described above, first, the inner shaft 15 is rotatably supported by the bearing 24 and the needle bearing 25 in the clutch housing chamber 14 of the housing 13. . The main outer clutch plate 32 of the main clutch 16 is spline-fitted to the spline teeth formed on the inner peripheral surface of the clutch storage chamber 14 and assembled so as to be movable in the axial direction. The main outer clutch plate 32 and the main inner clutch plate 32 are alternately arranged. The plate 31 is spline-fitted to the outer periphery of the inner shaft 15 and assembled so as to be movable in the axial direction. The spring 55 is provided on the shoulder portion 58 of the inner shaft 15, and the second cam member 45 of the cam type amplifying mechanism 18 that abuts on the spring 55 is spline-fitted to the outer periphery of the inner shaft 15 so that the first cam member 44 is not attached. The plurality of cam followers 40 are rotatably fitted to the outer periphery of the shaft 15, and the plurality of cam followers 40 are connected to the first and second cam members 4.
It is inserted between 4 and 45. Next, the armature 35 is spline-fitted to the outer periphery of the clutch storage chamber 14, and the pilot outer clutch plate 42 of the pilot clutch 34 is fitted.
Is fitted to the spline teeth formed on the inner peripheral surface of the clutch storage chamber 14 by spline fitting so as to be movable in the axial direction,
The pilot inner clutch plates 43 are alternately provided with the pilot outer clutch plates 42 and the first cam members 44.
The spline is fitted to the outer periphery of the so that it can be moved in the axial direction. The electromagnet 33 attached to the yoke 36 is arranged at a position surrounded by the intermediate member 39 and the small-diameter and large-diameter rear housing parts 37 and 38, and the yoke 36 is provided in the small-diameter rear housing part 37 with a minute gap by the bearing 28. Support rotatably. The large-diameter rear housing portion 38 of the rear housing 57 is screwed onto the inner peripheral surface of the housing 13 at a position facing the armature 35 with the pilot clutch 34 interposed therebetween, and the inner shaft 15 is rotated by the needle bearing 25 in the small-diameter rear housing portion 37. Assemble to support as much as possible. At this time, the intermediate member 39 is interposed between the small-diameter and large-diameter rear housing portions 37, 38 and fixed in advance by welding. Finally the rear housing 5
7 is rotated to adjust the screwing position into the housing 13 to adjust the clearance between the clutch plates of the main clutch 16, and then the large diameter rear housing portion 38 of the rear housing 57 is attached to the housing 13 by the double nut 56. The housing sub-assembly 41 is completed by tightening and fixing.

Next, the reference surface 22 is placed on the measurement reference surface, and the yoke 36 is erected vertically with the yoke 36 facing upward, and the dimension from the measurement reference surface to the yoke end surface 51 is measured. Based on the measured value, the shim 48 is attached to the bottom portion 50 of the fitting hole 52 of the rear case 20.
The shim 48 having a thickness such that the gap formed by the end surface of the shim 48 and the yoke end surface 51 becomes a predetermined distance when selected. As a result, even if there are variations in the total length of the housing sub-assemblies 41, the clearance gap in which the disc springs 49 are inserted can be made constant, and the repulsive force of the disc springs 49 is stabilized, so the electromagnetic pilot clutch device During operation of (1) or during driving of the vehicle, the disc spring 49 has a weak repulsive force, so that the housing sub-assembly 41 does not vibrate in the case 11, or the repulsive force is strong and the bearing 28 or the like is not overloaded. Next, the reference surface 22 is brought into contact with the end surface of the one shaft 21 to fix the housing 13 to the one shaft 21 with a plurality of bolts 29, the housing sub-assembly 41 is housed in the case body 11a, and the protrusion 36a of the yoke 36 is provided. Is engaged with the case body 11a to restrict rotation. Fitting hole 5 in rear case 20
Shim 48 and disc spring 4 of selected thickness on bottom 50 of 2
9, the yoke 36 is fitted into the fitting hole 52 so that the disc spring 49 contacts the yoke end surface 51, and the output shaft 23
With the outer spline 53 fitted to the inner spline 54, the rear case 20 is integrally connected to the case body 11a and fixed by the plurality of bolts 30, and the manufacturing of the electromagnetic pilot clutch device 10 is completed.

Next, the operation of the electromagnetic pilot clutch device 10 configured as described above will be described. As shown in FIG. 4, the electromagnetic pilot clutch device 10 is mounted on a path for transmitting a driving force to the rear wheels 5 of a motorcycle or an automobile and functions as a starting clutch device.
When the engine 6 is started, the output of the engine 6 is input to the V-belt type automatic transmission (CVT) 8, is decelerated by the first speed reducer 7, and is then transmitted to the input shaft 21 to drive the housing 13 to rotate. To be done. When starting the engine 6, normally
Since the electromagnet 33 is in the non-energized state, no magnetic flux is formed,
The pilot clutch 34 is in the disengaged state. At this time, the second cam member 45 is biased by the spring 55 and disengages from the main clutch 16, and the main inner clutch plate 31 and the main outer clutch plate 32 are separated from each other.
1 and the main outer clutch plate 32 rotate relative to each other, and torque is not transmitted from the input shaft 21 to the output shaft 23. The second cam member 45 is pressed against the first cam member 44 via the cam follower 40 by the repulsive force of the spring 55, and the pilot clutch 34 is not engaged and therefore is not rotating.

When the electromagnet 33 is energized, the yoke 36 and the small-diameter rear housing part 3 are set with the electromagnet 33 as a base point.
7, a magnetic flux circulating in the armature 35 and the large-diameter rear housing portion 38 is formed, and the armature 35 is attracted. Therefore, the armature 35 has the pilot clutch 3
4 is pressed and frictionally engaged, a pilot torque is generated, a relative rotation is generated between the first cam member 44 and the second cam member 45 of the cam type amplification mechanism 18, and the cam follower 40 is rotated.
And the action of the cam groove, the second cam member 45 moves in a direction in which the main inner clutch plate 31 and the main outer clutch plate 32 of the main clutch 16 are brought into pressure contact with each other, and the friction engagement force of the pilot clutch 34 is applied to the main clutch 16. A corresponding rotation torque is generated. The rotational torque is transmitted to the output shaft 23 via the inner shaft 15, is decelerated by the second speed reducer 9 and is transmitted to the axle 4, and the rear wheel 5 such as a motorcycle is rotationally driven.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electromagnetic pilot clutch device.

FIG. 2A of FIG. 1 showing a shim and a disc spring according to the present invention
FIG.

FIG. 3 is an enlarged vertical sectional view of a housing sub-assembly.

FIG. 4 is a diagram showing a driving force transmission path of a motorcycle or the like using the electromagnetic pilot clutch device according to the present invention.

[Explanation of symbols]

10 ... Electromagnetic pilot type clutch device, 11 ...
Case, 11a ... Case body, 12 ... Oil chamber, 13 ... Housing, 14 ... Clutch storage chamber, 15 ... Inner shaft (rotating member), 16 ...
・ Main clutch, 18 ・ ・ ・ Cam type amplification mechanism, 20 ・
..Rear case, 21 ... Input shaft (one-sided shaft), 22.
..Reference plane, 23 ... Output shaft (other shaft), 33 ...
Electromagnet, 34 ... Pilot clutch, 35 ... Armature, 36 ... Yoke, 37, 38 ... Small diameter,
Large diameter rear housing part, 39 ... Intermediate member, 41 ...
・ Housing sub-assembly, 44 ... First cam member, 4
5 ... 2nd cam member, 48 ... Shim, 49 ... Disc spring, 50 ... Bottom part, 51 ... Yoke end surface, 52 ...
..Mating holes, 56 ... double nuts, 57 ... rear housing

Claims (3)

[Claims] 1. A one-shaft rotatably supported by a case on a rotation axis, a housing disposed in the case and integrally connected to the one-shaft, and having a clutch storage chamber formed therein, The other shaft, which is rotatably supported on the rotation axis by facing the one shaft to the case, and the rotation, which is rotatably supported by the housing and extends into the clutch housing chamber, and is rotationally connected to the other shaft. A member, a main outer clutch plate whose relative rotation is restricted by the circumferential surface of the clutch housing chamber and which is engaged so as to be movable in the axial direction, and the main outer clutch plate and the main outer clutch plate which are arranged alternately and whose rotation is restricted by the rotating member. A main clutch including a main inner clutch plate that is movably engaged in the axial direction, and the relative rotation is restricted by the circumferential surface of the clutch storage chamber in the axial direction. A pilot outer clutch plate movably engaged with the pilot outer clutch plate, and a pilot inner clutch plate alternately arranged with the pilot outer clutch plate, the relative rotation of which is restricted by the first cam member and movably engaged in the axial direction. A pilot clutch, a large-diameter rear housing portion fixed to the opening of the housing, and a small-diameter rear housing portion rotatably supporting the rotating member at a position facing the armature with the pilot clutch interposed therebetween. An electromagnet fixed between the rear housing integrally joined by an annular intermediate member and the large-diameter and small-diameter rear housing portions to attract the armature and press-contact the pilot outer clutch plate and the pilot inner clutch plate. Bearing the small diameter rear housing part The second cam is actuated by the relative rotation of the yoke, which is rotatably supported, is fitted in and supported by the case and is prevented from rotating, and the second cam member and the first cam member that are in contact with the main clutch. A cam type amplification mechanism in which a member is moved in the axial direction and amplifies the transmission torque of the pilot clutch based on the attraction of the electromagnet to press-contact the main clutch; and a direction in which the second cam member is disengaged from the main clutch. In an electromagnetic pilot clutch device having a spring for urging, a shim having a thickness corresponding to dimensions of a reference surface in the rotation axis direction of the housing and the end surface of the yoke that integrally connects the housing to the one shaft is provided. The bottom portion and the yoke are interposed between the bottom portion of a fitting hole formed in the case for fitting and supporting the yoke and the end surface of the yoke. Electromagnetic pilot clutch device characterized by placing the dispersion of the repellent force of the interposed the disc spring between the surface within the permissible range. 2. The electromagnetic pilot clutch device according to claim 1, wherein the case is divided into a main body portion for housing the housing and a rear case portion for supporting the other shaft at a portion facing the yoke, An electromagnetic pilot clutch device, characterized in that the fitting hole is formed in a rear case portion. 3. The method of manufacturing the electromagnetic pilot clutch device according to claim 1, wherein the clutch accommodating chamber is formed in a housing, and the clutch accommodating chamber is rotatably supported by the housing. A rotating member extending to the main outer clutch plate and a main outer clutch plate that is engaged with the circumferential surface of the clutch housing chamber so that relative rotation is restricted and is movable in the axial direction. A main clutch having a main inner clutch plate whose rotation is restricted and engaged so as to be movable in the axial direction, and a relative rotation is restricted by the peripheral surface of the clutch storage chamber, which is engaged so as to be movable in the axial direction. A pilot outer clutch plate and a pilot outer clutch plate that are alternately arranged.
A pilot clutch including a pilot inner clutch plate that is engaged with a cam member so as to be restricted in relative rotation so as to be movable in the axial direction, a large-diameter rear housing portion fixed to an opening of the housing, and the rotating member. Between the rear housing, which is rotatably supported, and the large-diameter and small-diameter rear housing portions, which are integrally connected by a non-magnetic annular intermediate member at a position facing the armature with the pilot clutch interposed therebetween. A small diameter rear housing part is rotatably supported by a bearing and is fitted to and supported by the case to prevent the armature from being sucked and the pilot outer clutch plate and the pilot inner clutch plate to be in pressure contact with each other. And a second cam portion that comes into contact with the main clutch A cam that moves the second cam member in the axial direction by the operation of the cam mechanism by the relative rotation between the first cam member and the first cam member to amplify the transmission torque of the pilot clutch based on the attraction of the electromagnet to press the main clutch. A housing sub-assembly including a positive amplification mechanism and a spring for urging the second cam member in a direction to disengage the main clutch from the measurement reference surface by bringing the reference surface of the housing into contact with the measurement reference surface. A method for manufacturing an electromagnetic pilot clutch device, wherein a dimension up to the end face of the yoke is measured, and the thickness of the shim is selected based on the measured value.