Friction torque output device

Abstract

To provide a friction torque output device capable of widening a selection range of a material and improving friction characteristics.SOLUTION: A housing 3 to which an electric motor is attached, an adjustment screw 5 that receives a rotational output from the electric motor via a speed reduction mechanism, a movable pressing body 7 that is pressed and moved in an axial direction by a pressing portion 71, a friction torque output shaft 9 that is rotatably supported by the housing, an output rotor 11 that rotates together with the friction torque output shaft 9, a torque generation portion 13 that frictionally engages between the housing 3 and the output rotor 11, and a transmission portion 15 that transmits a propulsive force generated in the adjustment screw 5 so as to be received by the housing 3, wherein the torque generation portion 13 includes a male tapered surface 87 and a female tapered surface 89 that face each other so as to be capable of being fastened to each other; Male tapered surface 87 is provided in outer circumferential portion 77, outer circumferential portion 77 is engaged with inner circumferential portion 99 of outputting rotator 11 in the rotational direction and loosely fitted thereto in the radial direction, and female tapered surface 89 is provided in the inner circumferential portion of the clutch ring side 91a, side 91b engaged with housing 3 in the rotational direction and opposed to pressing portion 71 in the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a friction torque output device that frictionally engages a torque generating portion using an electric motor. [Background technology]

[0002] BACKGROUND ART Conventionally, an electromagnetic clutch shown in FIG. 6 of Patent Document 1 is known as a friction torque output device.

[0003] This electromagnetic clutch includes a housing 201 , an electromagnetic mechanism 203 , an armature 205 , a cam mechanism 207 , a receiving portion 209 , a first connecting portion 211 , a second connecting portion 213 , and a clutch portion 215 .

[0004] The electromagnetic mechanism 203 is supported by the housing 201, and the armature 205 is arranged so as to be relatively rotatable with respect to the electromagnetic mechanism 203 and so as to be attracted thereto.

[0005] The cam mechanism 207 exerts a cam thrust force between the pair of cam members 217, 219 by the relative rotation of the two cam members 217, 219, and also transmits torque.

[0006] The receiving portion 209 restricts the one cam member 217 from moving away from the other cam member 219 in the axial direction.

[0007] The first coupling portion 211 engages the armature 205 and one cam member 217, and the second coupling portion 213 couples the other cam member 219 to a shaft 221 so that they can rotate integrally.

[0008] The clutch portion 215 is formed between the other cam member 219 and the housing 201 and receives a cam thrust force to frictionally engage the other cam member 219 with the housing 201 .

[0009] In this electromagnetic clutch, for example, the housing 201 side is attached to the fixed side, and the shaft 221 is connected to the object to be braked.

[0010] When the electromagnetic coil of the electromagnetic mechanism 203 is de-energized, even if a rotational input is applied to the shaft 221 from the object to be braked, the cam mechanism 207 and the armature 205 rotate relative to the housing 201 together with the shaft 221, allowing the shaft 221 to rotate freely.

[0011] When the electromagnetic coil of the electromagnetic mechanism 203 is energized, the armature 205 is attracted in response to the electromagnetic force. This attraction causes the armature 205 to slide and rotate while experiencing rotational resistance in response to the magnetic force. This sliding rotation causes the cam member 217 on one side of the cam mechanism 207 to experience rotational resistance. On the other hand, the rotation of the shaft 221 causes the cam member 219 on the other side of the cam mechanism 207 to experience a rotational force.

[0012] A cam thrust force is generated in the cam mechanism 207 by the rotational resistance acting on one cam member 217 on the electromagnetic mechanism 203 side and the rotational force acting on the other cam member 219 on the shaft 221 side.

[0013] This cam thrust force causes the clutch portion 215 to frictionally engage in response to the cam thrust force, as described above, and a braking force acts on the shaft 221 via the cam member 219.

[0014] Furthermore, the rotational resistance of the armature 205 caused by the electromagnetic mechanism 203 acts on the shaft 221 via the cam mechanism 207 .

[0015] Therefore, when the electromagnetic coil is energized, the shaft 221 receives a braking force due to the braking force corresponding to the cam thrust force and the rotational resistance corresponding to the electromagnetic force, and can brake the object.

[0016] However, in such a conventional structure, it is necessary to use a magnetic material for the friction member, which makes it difficult to take measures against stick-slip and the like. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Patent Publication No. 2021-81004 Summary of the Invention [Problem to be solved by the invention]

[0018] The problem to be solved is that electromagnetic clutches require the use of magnetic materials in the friction members, which makes it difficult to take measures against stick-slip and the like. [Means for solving the problem]

[0019] The friction torque output device of the present invention, in order to widen the range of material options and enable improved friction characteristics, comprises a housing to which an electric motor is attached, an adjusting screw rotatably arranged within the housing, having a male thread portion, receiving rotational output from the electric motor via a speed reduction mechanism and coupled to the speed reduction mechanism so as to be movable in the axial direction, a movable pressing body having a female thread portion on its inner periphery that screws into the male thread portion and having a pressing portion on its outer periphery, the pressing portion moving in the axial direction as the male thread portion rotates, a friction torque output shaft rotatably supported by the housing, an output rotor arranged within the housing and rotating together with the friction torque output shaft, and an adjusting screw arranged between the movable pressing body and the output rotor and configured to move in the axial direction by receiving a pressing force from the pressing portion. and a transmission part, which is disposed between the adjusting screw and the housing and transmits a thrust generated in the adjusting screw by a reaction force acting on the pressing part so that the thrust is received by the housing, wherein the torque generating part has a male tapered surface and a female tapered surface opposed to each other so as to be fastened together, the male tapered surface being provided on an outer circumferential part which is formed separately from the inner circumferential part of the output rotator, the separately formed outer circumferential part being disposed axially between the pressing part and a receiving part provided on the housing, and engaging with the inner circumferential part of the output rotator in the direction of rotation and fitting loosely in the radial direction, and the female tapered surface being provided on an inner circumferential part of a clutch ring which engages with the housing in the direction of rotation and faces the pressing part in the axial direction. [Effects of the Invention]

[0020] The friction torque output device of the present invention has the above-mentioned configuration and can control the frictional engagement of the torque generation section using the rotational output of the electric motor, so it does not require a magnetic material to form a magnetic path to achieve frictional engagement, allowing for a wider range of material choices and improving frictional characteristics. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is a cross-sectional view of a friction torque output device according to a first reference example. [Figure 2] 10 is a cross-sectional view of a main part according to Reference Example 1, showing the engagement between an adjusting screw and a speed reducing mechanism. FIG. [Figure 3] FIG. 10 is a cross-sectional view of a friction torque output device according to a second reference example. [Figure 4] FIG. 6 is a cross-sectional view taken along line IV-IV in FIG. 5 according to the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 according to the first embodiment. [Figure 6] FIG. 10 is a cross-sectional view of an electromagnetic clutch according to a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention achieves the object of expanding the range of material choices and enabling improved friction characteristics as follows.

[0023] the torque generating unit is disposed between the movable pressure body and the output rotor and rotates together with the friction torque output shaft; a torque generating unit is disposed between the movable pressure body and the output rotor and generates a frictional engagement between the housing and the output rotor when the torque generating unit receives a pressing force from the pressing unit; and a transmission unit is disposed between the adjusting screw and the housing and transmits a thrust generated in the adjusting screw by a reaction force acting on the pressing unit so that the thrust generated in the adjusting screw is received by the housing.

[0024] The torque generating portion can be made of a non-magnetic material in consideration of friction characteristics.

[0025] The housing can be made of a non-magnetic material such as aluminum alloy, resin, etc. The housing can also be made of a magnetic material such as steel.

[0026] The electric motor and the reduction mechanism are configured as an integrated geared motor, but they can also be configured as separate units.

[0027] The movable pressing body can be realized either in a form in which the outer peripheral portion having the pressing portion and the inner peripheral portion having the female thread portion are formed from different materials and then integrally joined together, or in a form in which the outer peripheral portion and inner peripheral portion are integrally formed from a single material.

[0028] The movable pressing body and the output rotating body are formed in a disk shape, but the shape can be freely set as long as a torque generating portion can be disposed between them.

[0029] The output rotor may be realized by forming an outer periphery with a male tapered surface separately from an inner periphery.

[0030] The torque generating portion may be configured in any manner as long as it causes frictional engagement between the housing and the output rotor.

[0031] The torque generating portion includes a multi-plate clutch consisting of an inner plate and an outer plate, and the multi-plate clutch is disposed axially between the pressing portion and a receiving portion provided on the housing side, and the inner plate can be realized in a form in which the inner plate engages with the outer periphery of the output rotor in the rotational direction, and the outer plate engages with the inner periphery of the housing in the rotational direction.

[0032] The torque generating portion can also be realized in a form in which a male tapered surface and a female tapered surface are opposed to each other so as to be fastenable together, the male tapered surface being provided on the outer periphery of the output rotor, and the female tapered surface being provided on the inner periphery of a clutch ring which engages with the housing in the rotational direction and faces the pressing portion in the axial direction.

[0033] The torque generating portion has a male tapered surface and a female tapered surface that are opposed to each other and can be fastened together, the male tapered surface is provided on an outer circumferential portion that is formed separately from the inner circumferential portion of the output rotor, the outer circumferential portion that is formed separately is disposed axially between the pressing portion and a receiving portion provided on the housing side, and engages with the inner circumferential portion of the output rotor in the direction of rotation and fits loosely in the radial direction, and the female tapered surface can also be realized in a form that is provided on the inner circumferential portion of a clutch ring that engages with the housing in the direction of rotation and faces the pressing portion in the axial direction. [Example]

[0034] Fig. 1 is a cross-sectional view of a friction torque output device according to Reference Example 1. Fig. 2 is a cross-sectional view of a main part showing the engagement between an adjusting screw and a speed reduction mechanism.

[0035] As shown in FIG. 1, the friction torque output device 1 includes a housing 3, an adjusting screw 5, a movable pressing body 7, a friction torque output shaft 9, an output rotor 11, a torque generating section 13, and a transmission section 15.

[0036] The housing 3 is made of an aluminum alloy, etc. The housing 3 is composed of a shaft side portion 17 and a motor side portion 19.

[0037] The shaft side portion 17 is shaped so that a shaft support tube 23 is integrally formed on the inner periphery of the shaft side main portion 21. One shaft support portion 25 is formed at the end of the shaft support tube 23 between the shaft side main portion 21 and the shaft support tube 23. The other shaft support portion that pairs with the shaft support portion 25 is formed on the shaft support tube 23 or the like (not shown). The shaft side main portion 21 has a shaft side side wall portion 27 that is circumferentially oriented along the radial direction, and a receiving portion 29 that is stepped and circumferentially formed on the outer periphery of the shaft side side wall portion 27. An outer periphery wall portion 31 is provided on the outer periphery of the receiving portion 29.

[0038] The motor side portion 19 has a shape in which a motor support portion 35 is integrally formed with a motor side main body portion 33. The motor side main body portion 33 has a motor side wall portion 37 that is circumferentially shaped along the radial direction, and an inner peripheral wall portion 39 that is circumferentially formed on the outer peripheral side of the motor side wall portion 37. The inner peripheral wall portion 39 fits into the inner periphery of the outer peripheral wall portion 31, and the edge of the outer peripheral wall portion 31 abuts against the outer peripheral edge of the motor side wall portion 37.

[0039] The motor-side main body portion 33 is integrally joined to the shaft-side main body portion 21 by fastening nuts 43 to bolts 41 that penetrate the outer peripheries of the shaft-side sidewall portion 27 and the motor-side sidewall portion 37. A plurality of bolts 41 are provided at predetermined intervals in the circumferential direction. Each bolt 41 is exposed to the inner periphery along the inner periphery wall portion 39.

[0040] The motor support portion 35 is disposed eccentrically toward the axial center and is formed to be thicker than the motor-side sidewall portion 37. A thrust bearing portion 45 is formed as a recess on the inner surface of the motor support portion 35 around the axial center. Although not shown, the motor support portion 35 is formed to have a through-hole at the axial center, and a reduction output shaft 47 is disposed to pass through it.

[0041] A geared motor 49 is disposed on the outer surface of the motor support portion 35. The geared motor 49 is fastened and fixed to the motor support portion 35 from the inner surface side with screws 51. The geared motor 49 integrally includes an electric motor 52 and a reduction mechanism 53. The reduction output shaft 47 protrudes from the reduction mechanism 53.

[0042] The adjusting screw 5 is rotatably disposed at the axial center within the housing 3. The adjusting screw 5 is formed in a cylindrical shape and has a male thread portion 55 on its outer periphery. The adjusting screw 5 is coupled to the reduction output shaft 47 of the geared motor 49. Due to this coupling, the adjusting screw 5 receives rotational output from the electric motor 52 via a reduction mechanism 53.

[0043] 1 and 2, the adjusting screw 5 is coupled to the geared motor 49 by pins 57 arranged at three equally spaced locations in the circumferential direction. The adjusting screw 5 is fitted onto the reduction output shaft 47 of the geared motor 49, and pins 57 are interposed between the inner and outer periphery of the adjusting screw 5 and the reduction output shaft 47. The adjusting screw 5 is movable axially relative to the reduction output shaft 47 of the reduction mechanism 53.

[0044] The transmission unit 15 is disposed between the adjustment screw 5 and the housing 3. The transmission unit 15 transmits the thrust generated in the adjustment screw 5 by the reaction force acting on a pressing portion of the movable pressing body 7, which will be described later, so that the thrust is received by the thrust receiving portion 45 of the housing 3. The transmission unit 15 includes a thrust plate 59, a wire clip 61, and a thrust needle bearing 63.

[0045] The thrust plate 59 is fixed to the base of the adjusting screw 5 by press fitting or the like, and is positioned with respect to the adjusting screw 5 by the wire clip 61. The thrust plate 59 faces a washer 64 of the thrust receiving portion 45 in the axial direction via the thrust needle bearing 63.

[0046] The movable pressing body 7 is a circular adjustment plate having an internal thread portion 67 on an inner peripheral portion 65 and a pressing portion 71 on an outer peripheral portion 69. The movable pressing body 7 has the outer peripheral portion 69 having the pressing portion 71 and the inner peripheral portion 65 having the internal thread portion 67 formed from different materials and integrally joined by welding, brazing, press fitting, or the like.

[0047] The outer peripheral portion 69 of the movable pressing body 7 is a stepped donut-shaped disk plate made of, for example, carbon steel. The inner peripheral portion 65 of the movable pressing body 7 is formed into a ring shape made of, for example, phosphor bronze. The female thread portion 67 of the inner peripheral portion 65 is threadedly engaged with the male thread portion 55 of the adjusting screw 5. Rotation of the male thread portion 55 causes the pressing portion 71 to move in the axial direction. The male thread portion 55 of the adjusting screw 5 and the female thread portion 67 on the movable pressing body 7 side are designed to have approximately equal lead angles and friction angles, so that the efficiency of rotation transmission from the female thread portion 67 to the male thread portion 55 is set low. Therefore, even if the inner peripheral portion 65 of the movable pressing body 7 moves axially toward the reduction mechanism 53, rotation of the male thread portion 55 is restricted.

[0048] The pressing portion 71 of the movable pressing body 7 is provided on the outermost periphery via a bent portion 73 and faces in the axial direction. The pressing portion 71 of the movable pressing body 7 engages with the bolt 41 in the rotational direction.

[0049] The friction torque output shaft 9 is rotatably supported by the housing 3 and is connected to the object to be braked. The friction torque output shaft 9 is supported on one side by a ball bearing 75 at the shaft support portion 25, and on the other side by a ball bearing or the like at a shaft support portion not shown.

[0050] The output rotor 11 has an inner periphery integrally connected to the friction torque output shaft 9 and is configured to rotate together with the friction torque output shaft 9. The output rotor 11 is an output plate having a spline 79 on its outer periphery 77. The output rotor 11 is disposed within the housing 3 and faces closely to the movable pressing body 7. The outer periphery 77 of the output rotor 11 is disposed such that the axial tip side thereof radially overlaps the bent portion 73 of the movable pressing body 7.

[0051] The torque generating unit 13 includes a multi-plate clutch 81. The multi-plate clutch 81 is made up of an inner plate 83 and an outer plate 85. The multi-plate clutch 81 is disposed axially between the pressing unit 71 and a receiving unit 29 provided on the housing 3. The outer peripheral portion 77 of the output rotor 11 of the inner plate 83 is engaged with a spline 79 in the rotational direction. The outer plate 85 is engaged with a bolt 41 at the inner peripheral portion of the housing 3 in the rotational direction.

[0052] [braking] In the friction torque output device 1 configured as above, for example, the housing 3 is attached to the fixed side, and the friction torque output shaft 9 is connected to the object to be braked. However, the friction torque output device 1 can also be used as various torque transmission devices.

[0053] When the geared motor 49 is energized and controlled by the controller, the electric motor 52 reduces the rotation speed of the reduced output shaft 47 of the reduction mechanism 53. The rotation of the reduced output shaft 47 causes the male thread portion 55 to drive the female thread portion 67, and the inner peripheral portion 65 of the movable pressing body 7 moves axially toward the output rotating body 11.

[0054] Such movement of the movable pressing body 7 causes the pressing portion 71 to press the multi-plate clutch 81 , and controls the engagement of the multi-plate clutch 81 with respect to the receiving portion 29 .

[0055] This fastening control causes the outer circumferential portion 77 of the output rotor 11 to receive rotational resistance from the bolts 41 on the housing 3 side via the multi-plate clutch 81. This rotational resistance corresponds to the fastening force of the multi-plate clutch 81.

[0056] Therefore, the rotational resistance of the output rotor 11 is transmitted to the friction torque output shaft 9, braking the object. In this case, by controlling the rotation speed of the geared motor 49, it is possible to obtain an axial thrust proportional to the rigidity of the member to which the axial thrust and its reaction force are transmitted relative to the motor rotation position, enabling precise torque control.

[0057] During the braking, if a reaction force in the axial direction is applied from the object to be braked to the friction torque output shaft 9, it is transmitted from the output rotor 11 to the torque generating unit 13. This reaction force acts on the pressing portion 71 of the movable pressing body 7 with a magnitude corresponding to the fastening force of the multi-plate clutch 81. The reaction force transmitted to the pressing portion 71 is input to the threaded portion between the female threaded portion 67 and the male threaded portion 55 between the inner peripheral portion 65 of the movable pressing body 7 and the adjusting screw 5. At this time, because there is no transmission efficiency in the reverse direction at the threaded portion, the reverse rotation of the adjusting screw 5 is restricted even if the motor output torque is set to 0.

[0058] Therefore, it is not necessary to keep energizing the geared motor 49 in order to maintain the friction torque of the braking object, and energy efficiency can be improved.

[0059] When a reaction force is generated during braking, the adjusting screw 5 receives a driving force toward the reduction mechanism 53 relative to the reduction output shaft 47. This driving force is transmitted by the sliding of the adjusting screw 5 to the thrust receiving portion 45 via the wire clip 61, thrust plate 59, and thrust needle bearing 63, and then via the washer 64.

[0060] Therefore, even if a thrust force acts on the adjusting screw 5 toward the reduction mechanism 53 when the torque generating unit 13 is in operation, the thrust force is received by the thrust receiving portion 45 of the housing 3 and is not input to the reduction output shaft 47, thereby maintaining durability.

[0061] When the power supply to the geared motor 49 is turned off with the multi-plate clutch 81 not engaged, the inner plate 83 of the multi-plate clutch 81 can rotate freely relative to the outer plate 85 even if there is a rotational input from the object to be braked to the friction torque output shaft 9.

[0062] Since the frictional engagement of the torque generating unit 13 can be controlled by the rotational output of the geared motor 49, the range of materials that can be selected for the torque generating unit 13 and other components that cause frictional engagement can be expanded, enabling improved friction characteristics.

[0063] Specifically, there is no longer a need to use magnetic materials in the multi-plate clutch 81, and materials suitable for use as friction members can be used for the inner plate 83 and outer plate 85, thereby improving the friction torque characteristics.

[0064] The engagement between the multi-plate clutch 81 and the housing 3 is performed via bolts 41 that fasten the housing 3. Therefore, the housing 3 can be made of aluminum alloy or resin, making it possible to reduce the weight.

[0065] 3 is a cross-sectional view of a friction torque output device according to Reference Example 2. Components that are the same as or correspond to those in Reference Example 1 are denoted by the same reference numerals and will not be described again.

[0066] The second embodiment differs from the first embodiment in the form of the torque generating portion 13.

[0067] 3, the torque generating unit 13 of Reference Example 2 is a cone clutch 86 instead of the multi-plate clutch 81 of Reference Example 1. The cone clutch 86 has a male tapered surface 87 and a female tapered surface 89 that are opposed to each other and can be fastened together.

[0068] The male tapered surface 87 is provided on the outer periphery 77 of the output rotor 11 .

[0069] The female tapered surface 89 is provided on the inner periphery of a clutch ring 91. The clutch ring 91 is rotationally engaged with the bolt 41 on the housing 3 side and faces the pressing portion 71 of the movable pressing body 7 in the axial direction.

[0070] The outer peripheral portion 77 of the output rotor 11 of this Reference Example 2 is formed separately from the inner peripheral portion 92. The outer peripheral portion 77 and the inner peripheral portion 92 are fitted and connected by a spline 94. Therefore, the outer peripheral portion 77 can move axially relative to the inner peripheral portion 92. A thrust washer 96 is interposed between the rear of the outer peripheral portion 77 and the shaft-side sidewall portion 27. Therefore, the axial force received by the outer peripheral portion 77 when the cone clutch 86 is engaged can be received by the shaft-side sidewall portion 27 via the thrust washer 96.

[0071] The friction torque output shaft 9 of the output rotor 11 of this Reference Example 2 is rotatably supported by ball bearings 75a, 75b on the shaft support portions 25a, 25b of the stepped shaft support cylinder 23. A seal support portion 25c is formed between the shaft support portions 25a, 25b of the support cylinder 23, and an oil seal 93 such as an O-ring or X-ring is housed therein and is in close contact with the outer circumferential surface of the friction torque output shaft 9.

[0072] A key groove 95 for a key is provided at the outer end of the friction torque output shaft 9. A key arranged in the key groove 95 prevents rotation of a flange member or the like that connects to the braking target side. A male thread portion 97 for fastening a nut or the like is provided at the outer end of the friction torque output shaft 9. A nut is screwed onto the male thread portion 97 to fasten and fix the flange member or the like to the shaft. A spline or the like may also be used instead of a key to fasten the flange member or the like to the shaft.

[0073] The housing 3 has a configuration in which a motor-side main body portion 33 is fitted onto the edge of an outer peripheral wall portion 31 of the shaft-side main body portion 21 .

[0074] Therefore, in the second embodiment, when the geared motor 49 is energized, the pressing portion 71 presses the clutch ring 91 in the same manner as in the first embodiment, and the female tapered surface 89 is fastened to the male tapered surface 87 .

[0075] In the second embodiment, the object can be braked in the same manner as in the first embodiment, and the same operational effects as in the first embodiment can also be obtained.

[0076] Fig. 4 relates to Example 1 and is a cross-sectional view taken along line IV-IV in Fig. 5. Fig. 5 relates to Example 1 and is a cross-sectional view taken along line VV in Fig. 4. Note that components that are the same as or correspond to those in Reference Example 1 are denoted by the same reference numerals and will not be described again.

[0077] The first embodiment differs from the first reference embodiment in the configuration of the torque generating portion 13 and the transmission portion 15.

[0078] As shown in FIGS. 4 and 5, the torque generating section 13 of the first embodiment is provided with a cone clutch 86 similar to that of the second embodiment in place of the multi-plate clutch 81 of the first embodiment, which is capable of being engaged.

[0079] The male tapered surface 87 of the cone clutch 86 is provided on the outer circumferential portion 77 of the output rotor 11. A pair of male tapered surfaces 87 are provided axially symmetrically on the outer circumferential surface of the outer circumferential portion 77. The outer circumferential portion 77 of the output rotor 11 is formed separately from the inner circumferential portion 99.

[0080] The female tapered surface 89 is provided on the inner periphery of a pair of clutch rings 91a, 91b in the axial direction. The clutch rings 91a, 91b are rotationally engaged with bolts 41 on the housing 3 side. The back surface of one clutch ring 91a faces the pressing portion 71 of the movable pressing body 7 in the axial direction. The back surface of the other clutch ring 91b is received so as to face the housing 3 side in the axial direction.

[0081] The separately formed outer peripheral portion 77 is disposed axially between the pressing portion 71 and the housing 3 side, and each male tapered surface 87 faces the female tapered surface 89 of the clutch rings 91 a, 91 b. The outer peripheral portion 77 engages with the inner peripheral portion 99 of the output rotor 11 in the rotational direction and is loosely fitted in the radial direction.

[0082] The outer peripheral portion 77 is loosely fitted via an intermediate ring 101. The intermediate ring 101 is loosely fitted to both the outer peripheral portion 77 and the inner peripheral portion 99. The intermediate ring 101 has a pair of inner convex portions 103 and a pair of outer convex portions 105 that are offset by 90 degrees. The inner convex portions 103 are fitted into inner concave portions 107 provided on the outer peripheral surface of the inner peripheral portion 99, and the inner convex portions 103 and the inner concave portions 107 are engaged in the rotational direction and are loosely fitted in the radial direction. The outer convex portions 105 are fitted into outer concave portions 109 provided on the inner peripheral surface of the outer peripheral portion 77, and the outer convex portions 105 and the outer concave portions 109 are engaged in the rotational direction and are loosely fitted in the radial direction.

[0083] The inner peripheral portion 99 of the output rotor 11 is provided with positioning plates 111 on both axial sides. The outer periphery of the positioning plates 111 is formed with a larger diameter than the inner peripheral portion 99. The two positioning plates 111 sandwich the intermediate ring 101 in the axial direction, positioning the intermediate ring 101 in the axial direction. A protruding edge portion facing axially outward is formed on the inner periphery of each of the positioning plates 111 between them. The protruding edge portion of one of the positioning plates 111 abuts in the axial direction against a stopper ring 107 fitted into the output rotor 11. The protruding edge portion of the other positioning plate 111 abuts in the axial direction against the inner race of the ball bearing 75a.

[0084] An axial oil hole 113 is formed at the inner end of the output rotor 11, and a radial oil hole 115 is formed in this oil hole 113 at the back on the side of the friction torque output shaft 9. The oil hole 115 opens between the ball bearing 75a and the oil seal 93.

[0085] A flange member 117 for connecting the brake target side is splined to the outer end of the friction torque output shaft 9 , and is fastened and fixed with a nut 119 that screws onto the male thread portion 97 .

[0086] In the transmission part 15 of the first embodiment, the inner peripheral part 65 of the movable pressing body 7 is spline-fitted to the outer peripheral part 69. This spline-fitting is achieved by crimping on one axial side between the inner peripheral part 65 and the outer peripheral part 69. An oil seal 121 is interposed between the reduction output shaft 47 and the motor-side side wall part 37 of the housing 3.

[0087] The housing 3 has a configuration in which the motor side main body portion 33 is fitted onto the edge of the outer peripheral wall portion 31 of the shaft side main body portion 21, as in the second embodiment.

[0088] Therefore, in this embodiment 1, when the geared motor 49 is energized, the pressing portion 71 presses one clutch ring 91a, similar to Reference Example 1. One clutch ring 91a presses the outer circumferential portion 77 of the output rotor 11 in the axial direction, and the outer circumferential portion 77 abuts against the other clutch ring 91b. This abutment fastens the pair of female tapered surfaces 89 of the torque generating portion 13 to the pair of male tapered surfaces 87.

[0089] At this time, the clutch ring 91 and the inner peripheral portion 99 can move relative to each other in the radial direction due to the loose fit of the clutch ring 91 in the intermediate ring 101. This relative movement allows the clutch ring 91 to be automatically centered with respect to the inner peripheral portion 99 when fastening the female tapered surface 89 and the male tapered surface 87 together. This centering allows the female tapered surface 89 and the male tapered surface 87 to be fastened together accurately.

[0090] In the first embodiment, the object can be braked in the same manner as in the first reference example, and the same operational effects as in the first reference example can also be obtained. [Explanation of symbols]

[0091] 1. Friction torque output device 3. Housing 5 Adjustment screw 7 Movable pressing body (adjustment plate) 9 Friction torque output shaft (output shaft) 11 Output rotor (output plate) 13 Torque generating section 15 Transmission section 29 Receiving part 47 Deceleration output shaft 49 Geared motor 52 Electric Motor 53 Reduction mechanism 55 Male thread 65 Inner circumference of movable pressing body 67 Female thread 69 Outer periphery of movable pressing body 71 Pressing part 77 Outer periphery of output rotor 81 Multi-plate clutch 83 Inner plate 85 outer plate 87 Male tapered surface 89 Female tapered surface 91, 91a, 91b clutch ring 99 Inner circumference

Claims

[Claim 1] a housing in which an electric motor is mounted; an adjusting screw that is rotatably disposed within the housing, has a male thread portion, receives rotational output from the electric motor via a reduction mechanism, and is coupled to the reduction mechanism so as to be axially movable; a movable pressing body having an internal thread portion on an inner periphery thereof that screws into the external thread portion and a pressing portion on an outer periphery thereof, the pressing portion moving in an axial direction when the external thread portion rotates; a friction torque output shaft rotatably supported by the housing; an output rotor disposed within the housing and rotating together with the friction torque output shaft; a torque generating section disposed between the movable pressing body and the output rotor and receiving a pressing force from the pressing section to frictionally engage the housing and the output rotor; a transmission section that is disposed between the adjusting screw and the housing and transmits a thrust generated in the adjusting screw by a reaction force acting on the pressing section so that the thrust is received by the housing. the torque generating portion has a male tapered surface and a female tapered surface facing each other so as to be fastened together; the male tapered surface is provided on an outer circumferential portion formed separately from an inner circumferential portion of the output rotor, the separately formed outer peripheral portion is disposed between the pressing portion and a receiving portion provided on the housing in the axial direction, and is engaged with the inner peripheral portion of the output rotor in the rotational direction and loosely fitted in the radial direction, The female tapered surface is provided on an inner peripheral portion of a clutch ring that engages with the housing in a rotational direction and faces the pressing portion in an axial direction. Friction torque output device.

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