JP3952712B2 - Electromagnetic pilot type clutch device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic pilot type clutch device and a manufacturing method thereof.
[0002]
[Prior art]
The transmission torque of the electromagnetic pilot type clutch device that transmits the rotational power of the engine to the drive wheels varies due to the magnetic flux circulating through the yoke, the small-diameter rear housing portion, the armature, and the large-diameter rear housing portion, starting from the electromagnet. The variation in the transmission torque due to the magnetic flux changes the magnetic path cross-sectional area formed by the yoke inner peripheral surface and the small-diameter rear housing portion outer peripheral surface and the magnetic path cross-sectional area formed by the yoke outer peripheral surface and the large-diameter rear housing portion inner peripheral surface. Therefore, the distance between the inner peripheral surface of the yoke and the outer peripheral surface of the small-diameter rear housing part (magnetic path length) or the distance between the outer peripheral surface of the yoke and the inner peripheral surface of the large-diameter rear housing part can be adjusted. A plurality of yokes with different (magnetic path lengths) are prepared, and the variation in transmission torque is adjusted within an allowable range by using the prepared yokes.
[0003]
[Problems to be solved by the invention]
In the conventional clutch device described above, in order to adjust the variation in the transmission torque within an allowable range, the distance (magnetic path length) between the yoke inner peripheral surface and the small-diameter rear housing outer peripheral surface or the yoke outer peripheral surface and the large diameter Since a plurality of yokes having different distances (magnetic path lengths) from the inner peripheral surface of the rear housing portion must be prepared, the cost is increased and the yoke is replaced, so that there is a problem that it takes time to manufacture.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the structural feature of the invention described in claim 1 is that a rotating shaft that is rotatably supported on a rotating axis on a case, and a rotating shaft that is disposed in the case and integrated with the rotating shaft. And a housing having a clutch housing chamber formed therein, a rotating member rotatably supported by the housing and extending into the clutch housing chamber, and a relative rotation restricted by a peripheral surface of the clutch housing chamber. A main outer clutch plate that is movably engaged in the axial direction, and a main inner clutch plate that is alternately arranged with the main outer clutch plate and is engaged with the rotating member so as to be movably engaged in the axial direction. A main clutch provided, and a pilot outer clutch play that is engaged with the outer circumferential surface of the clutch housing chamber so as to be movable in the axial direction with relative rotation restricted. And a pilot clutch having a pilot inner clutch plate that is alternately arranged with the pilot outer clutch plate and is engaged with the first cam member so that relative rotation is restricted and movable in the axial direction, and an opening of the housing A rear portion in which a fixed large-diameter rear housing portion and a small-diameter rear housing portion that rotatably supports the rotating member are integrally coupled by a non-magnetic annular intermediate member at a position facing the armature with the pilot clutch interposed therebetween. An outer magnetic path portion is formed between the housing and the outer peripheral surface with the inner peripheral surface of the large-diameter rear housing portion, and an inner magnetic path portion is formed with the outer peripheral surface of the small-diameter rear housing portion. and, electromagnetic for pressing the said pilot outer clutch plates and pilot inner clutch plates by suction the armature The second cam member is moved in the axial direction by the operation of the cam mechanism by the relative rotation of the first cam member with the yoke to which is fixed, the second cam member abutting on the main clutch, and the electromagnet An electromagnetic pilot type clutch device having a cam type amplifying mechanism that amplifies and press-contacts the transmission torque of the pilot clutch based on the suction of the piston, and rotatably supports the rotating member while being fixed to the case. A rear case that is screwed and rotated to adjust its position in the direction of the rotation axis, and in at least one of the outer magnetic path and the inner magnetic path, the outer magnetic path includes an outer diameter portion formed on the yoke and the outer magnetic path. An outer land portion formed at an end portion of the inner peripheral surface of the large-diameter rear housing portion so as to face the diameter portion, and the inner magnetic path is connected to the small-diameter An inner land portion formed at an end portion of the outer peripheral surface of the housing portion, and a step portion formed on the inner peripheral surface of the yoke so as to face the inner land portion, and a rotational axis direction of the yoke with respect to the rear housing The relative movement of the magnetic path changes the magnetic path cross-sectional area, and the relative movement of the yoke relative to the rear housing in the direction of the rotation axis changes the magnetic path cross-sectional area, and the rotating shaft and the rotating member with respect to the current supplied to the electromagnet And a fixing means for fixing the rear case to the case after rotating the rear case and adjusting the position in the direction of the rotation axis so that the variation of the transmission torque between the first and second cases falls within an allowable range .
[0010]
[Operation and effect of the invention]
In the invention according to claim 1 configured as described above, the rear case on which the rotating member is rotatably supported is screwed into the case, and the position is adjusted in the direction of the rotation axis by the rotation. The outer peripheral surface of the yoke fixed to the rear case constitutes an outer magnetic path portion facing the inner peripheral surface of the large-diameter rear housing portion, and the inner peripheral surface faces the outer peripheral surface of the small-diameter rear housing portion. Is configured. By adjusting the position of the rear case relative to the case, the yoke is moved relative to the rear housing in the rotational axis direction, and the magnetic path cross-sectional area changes in at least one of the outer magnetic path portion and the inner magnetic path portion. When the variation of the transmission torque between the rotating shaft and the rotating member with respect to the current supplied to the electromagnet falls within the allowable range due to the adjustment of the magnetic path cross-sectional area , the rear case is fixed to the case at the adjusted position.
As a result, the yoke is moved relative to the rear housing in the rotational axis direction only by rotating the rear case screwed to the case and adjusting the position with respect to the case, so that at least the outer magnetic path portion and the inner magnetic path portion are at least On the other hand, the cross-sectional area of the magnetic path changes, and it can be very easily adjusted so that the variation of the transmission torque with respect to the current supplied to the electromagnet falls within the allowable range.
Further, in at least one of the outer magnetic path portion and the inner magnetic path portion, the outer magnetic path is formed on the outer diameter portion formed in the yoke and the inner peripheral surface end portion of the large-diameter rear housing portion facing the outer diameter portion. The outer land portion is formed, and the inner magnetic path is formed on the outer peripheral surface end portion of the small-diameter rear housing portion and on the inner peripheral surface of the yoke so as to face the inner land portion. Since the yoke moves relative to the rear housing in the rotational axis direction, the magnetic path cross-sectional area can be changed reliably.
Thus, in order to adjust the transmission torque variation, the distance (magnetic path length) between the yoke inner peripheral surface and the small-diameter rear housing portion outer peripheral surface or the distance between the yoke outer peripheral surface and the large-diameter rear housing portion inner peripheral surface ( There is no need to prepare a plurality of yokes having different magnetic path lengths), the cost can be reduced, and transmission torque variation can be easily and quickly adjusted without replacing the yoke.
[0016]
[Embodiment]
Embodiments of an electromagnetic pilot type clutch device according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an electromagnetic pilot type clutch device 10, and a case 11 is attached to a vehicle body such as a motorcycle. The case 11 includes a cylindrical case main body 11a and a rear case 20, and an oil chamber 12 in which clutch oil 19 is stored is provided inside the case 11. A housing 13 is accommodated in the oil chamber 12, and a flange portion formed on a connecting member 17 that connects the housing 13 and the rotating shaft 21 is provided on the front end surface 22 of the housing 13. It is fixed with bolts 30. The cylindrical portion of the connecting member 17 has an outer peripheral surface rotatably supported by the bearing 27, an inner spline is formed on the inner peripheral surface, and is splined with an outer spline formed on the outer peripheral surface at the tip of the rotating shaft 21. . An annular oil seal 53 for preventing the clutch oil 19 from leaking to the outside is attached to the outer peripheral surface of the front end of the cylindrical portion of the connecting member 17. A cylindrical protective case 61 that protects the rotating shaft 21 is attached to the case main body 11 a at a predetermined distance from the outer periphery of the rotating shaft 21 and fixed by a plurality of bolts 60.
[0017]
In the housing 13, a stepped cylindrical inner shaft 15 that is a rotating member extends along the rotation axis. The inner shaft 15 is rotatably supported on the housing 13 via bearings 24 and 28 and a needle bearing 25. An inner spline is formed on the inner peripheral surface of the rear end portion of the inner shaft 15, and is spline-fitted with an outer spline formed at the distal end portion of the output shaft 23. An annular oil seal 54 is attached to the outer periphery of the rear portion of the inner shaft 15 to prevent the clutch oil 19 from leaking from the oil chamber 12 to the outside.
[0018]
A clutch housing chamber 14 is formed in the housing 13 and a main clutch 16 is disposed. The main clutch 16 is a wet multi-plate friction clutch, and includes a plurality of main inner clutch plates 31 and a main outer clutch plate 32. The main inner clutch 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 main outer clutch plate 32 is spline teeth formed on the inner peripheral surface of the clutch housing chamber 14 of the housing 13. It is assembled so that it can be moved in the axial direction by spline fitting. The main inner clutch plates 31 and the main outer clutch plates 32 are alternately arranged. When engaged, the main inner clutch plates 31 and the main outer clutch plates 32 are brought into contact with each other and frictionally engaged. A plurality of open connection holes 46 and 47 are provided in the peripheral wall of the housing 13 so that the clutch oil 19 can circulate in the oil chamber 12 and the clutch storage chamber 14.
[0019]
The cam type amplification mechanism 18 is disposed behind the main clutch 16 and includes a first cam member 44, a second cam member 45, and a plurality of cam followers 40. One of the second cam members 45 is in contact with the main clutch 16 in a spline-fitted state on the outer periphery of the inner shaft 15 and presses the main clutch 16 by a cam mechanism. The first cam member 44 is fitted to the outer periphery of the inner shaft 15 behind the second cam member 45 with the plurality of cam followers 40 interposed therebetween, and is positioned on the inner peripheral side of the pilot clutch 34 described later. The plurality of cam followers 40 are interposed in cam grooves formed between the first and second cam members 44 and 45. A spring 55 is interposed between the second cam member 45 and the shoulder portion 58 of the inner shaft 15, and the second cam member 45 is attached in a direction in which the second cam member 45 is detached from the main clutch 16 by the repelling force of the spring 55. When the cam mechanism is not operated, the main inner clutch plate 31 and the main outer clutch plate 32 are separated from each other, and the second cam member 44 is pressed to move the plurality of cam followers 40 to the first, second cam members 44, 45 is accommodated in the cam groove.
[0020]
The pilot clutch 34 includes a pilot outer clutch plate 42 and a pilot inner clutch plate 43, and is disposed behind the second cam member 44. The pilot outer clutch plate 42 has spline teeth formed on the inner peripheral surface of the clutch housing chamber 14. The pilot inner clutch plate 43 is assembled to be splined to the outer peripheral surface of the first cam member 44 so as to be movable in the axial direction. The armature 35 has an annular shape and is disposed between the pilot clutch 34 and the second cam member 45 and is assembled so as to be movable in the axial direction by spline fitting to the inner peripheral surface of the clutch housing chamber 14. The armature 35 is attracted by a magnetic flux formed with an electromagnet 33 (described later) as a base point to press the pilot clutch 34.
[0021]
A rear housing 57 that covers the opening of the housing 13 is fitted behind the pilot clutch 34. The rear housing 57 includes a small-diameter rear housing part 37, a large-diameter rear housing part 38, and an intermediate member 39. The small-diameter rear housing portion 37 has a stepped cylindrical shape, and supports the inner shaft 15 via a needle bearing 25 so as to be rotatable. On the outer periphery of the small-diameter rear housing portion 37, a stepped cylindrical large-diameter rear housing portion 38 is disposed at a predetermined interval, and is screwed into a female screw engraved on the inner peripheral surface of the opening of the housing 13. . An annular stainless steel intermediate member 39 is interposed between the inner peripheral surface of the large-diameter rear housing portion 38 and the outer peripheral surface of the small-diameter rear housing portion 37, and is welded to the small-diameter and large-diameter rear housing portions 37 and 38. Are integrally fixed. After adjusting the position by screwing the rear housing 57 into the housing 13, the outer periphery of the large-diameter rear housing part 38 is fixed by the double nut 56. The small-diameter and large-diameter rear housing portions 37 and 38 are made of a magnetic material, and the intermediate member 39 is a non-magnetic material, so that a magnetic flux is easily formed by an electromagnet 33 described later.
[0022]
The electromagnet 33 has an annular shape and is interposed at a position surrounded by the intermediate member 39 and the small-diameter and large-diameter rear housing portions 37 and 38. The electromagnet 33 is energized by the energizing cord 59 and fixed to the annular yoke 36. . The yoke 36 forms an inner magnetic path portion 63 and an outer magnetic path portion 64 with a small gap between the small-diameter and large-diameter rear housing portions 37 and 38 and a small gap with the small-diameter and large-diameter rear housing portions 37 and 38. The inner magnetic path portion 63 is formed between an inner land portion 51 formed on the outer peripheral surface end portion of the small-diameter rear housing portion 37 and a step portion 52 formed on the inner peripheral surface of the yoke 36 so as to face the inner land portion 51. A magnetic path cross-sectional area 65 is an area where the inner land portion 51 and the stepped portion 52 overlap each other. The outer magnetic path portion 64 is formed between an outer diameter portion 48 formed on the yoke 36 and an outer land portion 49 formed on the inner peripheral surface end portion of the large-diameter rear housing portion 38 so as to face the outer diameter portion 48. The magnetic path cross-sectional area 66 is an area where the outer diameter portion 48 and the outer land portion 49 through which the magnetic flux can pass is a minute gap through which the magnetic flux is formed.
[0023]
The yoke 36 is fixed to the rear case 20 with a plurality of bolts 62, and the rear case 20 supports the inner shaft 15 via a bearing 28 so as to be rotatable. A male screw portion 29 formed on the outer periphery of the rear case 20 is screwed with a female screw portion 26 formed on the inner periphery of the case main body 11 a, and a liquid tight state is maintained by an annular oil seal 41. After the housing 13 and the components are assembled to the case body 11a, the rear case 20 is fixed to the case body 11a by welding 50, caulking, or a double nut.
[0024]
In the manufacture of the electromagnetic pilot type clutch device 10 configured as described above, in order to adjust the transmission torque, the clutch device 10 is assembled and the rotary shaft 21, the inner shaft 15, and the rear case 20 are not fixed. A measuring device (not shown) for measuring the transmission torque between the clutch device 10 and the clutch device 10 is attached. Next, the transmission torque between the rotating shaft 21 and the inner shaft 15 is measured by a measuring instrument in a state where a predetermined current is passed from the energization cord 59 to the electromagnet 33. The rear case 20 is rotated to change the position of the magnetic path cross-sectional areas 65 and 66 of the inner magnetic path portion 63 and the outer magnetic path portion 64 so that the transmission torque error falls within the allowable range. When the rear case 20 is rotated, the rear case 20 is rotated in a state of being biased in one direction so that the position of the yoke 36 is not changed by play such as screws. After the position adjustment is completed, the rear case 20 is fixed to the case main body 11a by welding 50, caulking, a double nut or the like.
[0025]
Next, the operation of the electromagnetic pilot type clutch device 10 configured as described above will be described. As shown in FIG. 2, the electromagnetic pilot type clutch device 10 is mounted on a path for transmitting driving force to the rear wheel 5 such as 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 a V-belt type automatic transmission (CVT) 8, decelerated by the first speed reducer 7, and then transmitted to the input shaft 21 to rotate the housing 13. Is done. When the engine 6 is started, the electromagnet 33 is normally in a non-energized state, so no magnetic flux is formed, and the pilot clutch 34 is in a non-engaged state. At this time, the second cam member 45 is urged 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. The outer clutch plate 32 rotates relative to each other, and torque is not transmitted from the rotating 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 repelling force of the spring 55, and the pilot clutch 34 is not rotating because it is in a non-engaged state.
[0026]
When the electromagnet 33 is energized from the energization cord 59, a magnetic flux is formed with the electromagnet 33 as a base point. The magnetic flux passes from the electromagnet 33 to the yoke 36, from the step portion 52 of the yoke 36 through the inner magnetic path portion 63 to the inner land portion 51 of the small-diameter rear housing portion 37, and from the small-diameter rear housing portion 37 through the pilot clutch 34. To the armature 35, from the armature 35 to the large-diameter rear housing portion 38, from the outer land portion 49 of the large-diameter rear housing portion 38 through the outer magnetic path portion 64, to the outer diameter portion 48 of the yoke 36, and from the yoke 36 to the electromagnet 33 A circulating magnetic flux is formed to attract the armature 35. By this suction, the armature 35 presses the pilot clutch 34 and frictionally engages, so that relative rotation occurs between the first cam member 44 and the second cam member 45 of the cam type amplification mechanism 18, and the cam follower 40 and the cam Due to the action of the 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 pressed against each other, and the main clutch 16 corresponds to the frictional engagement force of the pilot clutch 34. Transmission torque is generated. The transmission torque is transmitted to the output shaft 23 via the inner shaft 15, decelerated by the second reduction gear 9 and transmitted to the axle 4, and the rear wheel 5 such as a motorcycle is rotationally driven.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an electromagnetic pilot type clutch device according to the present invention.
FIG. 2 is a diagram showing a driving force transmission path of a motorcycle or the like using the electromagnetic pilot type clutch device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Clutch apparatus, 11 ... Case, 11a ... Case main 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 ... Rotating shaft, 23 ... Output shaft, 26 ... Female thread, 29 ... Male thread , 33 ... electromagnet, 34 ... pilot clutch, 35 ... armature, 36 ... yoke, 37 ... small diameter rear housing part, 38 ... large diameter rear housing part, 39 ... Intermediate member, 40 ... cam follower, 44 ... first cam member, 45 ... second cam member, 48 ... outer diameter part, 49 ... outer land part, 50 ... welding, 51 ... Inner land part, 52 ... Step part, 5 ... Spring, 56 ... Double nut, 57 ... Rear housing, 59 ... Electric cord, 63 ... Inner magnetic path, 64 ... Outer magnetic path, 65,66 ... Magnetic path cross section.

Claims (1)

A rotating shaft supported rotatably on the rotation axis on the case; a housing disposed in the case and integrally connected to the rotating shaft and having a clutch housing chamber formed therein; and rotatable relative to the housing A rotating member that is supported and extends into the clutch housing chamber, a main outer clutch plate that is engaged with the peripheral surface of the clutch housing chamber so that relative rotation is restricted and movable in the axial direction, and the main outer clutch plate alternately And a main clutch having a main inner clutch plate that is engaged with the rotating member so as to be movable in the axial direction, and relative rotation is restricted by the peripheral surface of the clutch housing chamber in the axial direction. Pilot outer clutch plates that are movably engaged, and first cams that are alternately arranged with the pilot outer clutch plates A pilot clutch including a pilot inner clutch plate that is engaged with the material so that relative rotation is restricted and movable in the axial direction; a large-diameter rear housing portion fixed to the opening of the housing; and the rotating member. A rear housing in which a small-diameter rear housing portion that can be supported is integrally coupled by a non-magnetic annular intermediate member at a position facing the armature with the pilot clutch interposed therebetween, and an outer peripheral surface within the large-diameter rear housing portion. An outer magnetic path portion is formed between the outer peripheral surface and the inner peripheral surface is formed with an inner magnetic path portion between the outer peripheral surface of the small-diameter rear housing portion, and the armature is attracted to the pilot outer clutch plate. A yoke to which an electromagnet that press-contacts the pilot inner clutch plate is fixed, and a second cam member that contacts the main clutch A cam type in which the second cam member is moved in the axial direction by operation of a cam mechanism by relative rotation with the first cam member, and the main clutch is abutted by amplifying the transmission torque of the pilot clutch based on the attraction of the electromagnet. In an electromagnetic pilot clutch device having an amplification mechanism,
The yoke is fixed and the rotating member is rotatably supported , and includes a rear case that is screwed into the case and rotated to adjust its position in the rotation axis direction;
In at least one of the outer magnetic path and the inner magnetic path, the outer magnetic path has an outer diameter portion formed in the yoke and an inner peripheral surface end portion of the large-diameter rear housing portion facing the outer diameter portion. The inner magnetic path is formed on the outer peripheral surface end portion of the small-diameter rear housing portion and on the inner peripheral surface of the yoke so as to face the inner land portion. A magnetic path cross-sectional area is changed by the relative movement of the yoke with respect to the rear housing in the rotation axis direction.
The magnetic path cross-sectional area is changed by the relative movement of the yoke with respect to the rear housing in the rotation axis direction, and the variation in the transmission torque between the rotation shaft and the rotation member with respect to the current supplied to the electromagnet is within an allowable range. An electromagnetic pilot type clutch device comprising a fixing means for rotating the rear case and adjusting the position in the direction of the rotation axis so as to be fixed .

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