JP2014043871A - Driving force transmission and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving force transmission that can easily adjust transmission torque characteristics in a specific current region and includes an electromagnetic clutch, and provide a manufacturing method of the driving force transmission.SOLUTION: A clutch pressing member 33 of a cam mechanism 15 is formed so as to separate from a main cam 18. The clutch pressing members 33 having different axial plate thickness and end surface shape on an axial anti-main clutch side are fixed to a common main cam 18 body member provided in a common manner, by, for example, welding. The axial plate thickness of the clutch pressing member 33 is increased over the whole circumference, and thereby rigidity of the clutch pressing member 33 is increased.

Description

  The present invention relates to a driving force transmission device and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a cylindrical first rotating member that rotates by input of a driving force, and a shaft-shaped second rotating member that is coaxially arranged rotatably in the first rotating member, the first rotating member and the second rotating member are provided. There is a driving force transmission device in which a first rotating member and a second rotating member can be connected so as to transmit torque by a clutch mechanism provided between the rotating member and the rotating member. Such a driving force transmission device is provided, for example, in a driving force transmission path to the auxiliary driving wheel side in a four-wheel drive vehicle, and controls torque transmitted to the auxiliary driving wheel. The clutch mechanism includes an electromagnetic clutch that includes a plurality of clutch plates that transmit torque between a first rotating member and a second rotating member, and electromagnetic coils that frictionally engage these clutch plates.

  The electromagnetic clutch used in the driving force transmission device includes a yoke that supports the electromagnetic coil so as to be relatively rotatable with the first and second rotating members, an armature that is disposed with each clutch plate interposed between the electromagnetic coil, In the electromagnetic clutch comprising a magnetic path forming member interposed between the clutch plate and the electromagnetic coil, the magnetic flux generated by the electromagnetic coil is generated by the yoke, the magnetic path forming member, each clutch plate, the armature, A magnetic circuit passing through the clutch plate, the magnetic path forming member, and the yoke is configured. As a result, the armature is attracted by the magnetic induction action, the clutch plates are frictionally engaged, and the main clutch is operated to transmit torque between the first rotating member and the second rotating member. .

  In such a driving force transmission device, a method of adjusting the IT characteristic indicating the relationship between the current supplied to the electromagnetic coil and the transmittable torque by adjusting the gap between the yoke and the magnetic path forming member. Has been proposed (see, for example, Patent Document 1). According to the technique of Patent Document 1, a magnetic path adjusting member is provided between the yoke and the magnetic path forming member, so that the magnetic path area through which the magnetic flux passes can be adjusted.

Japanese Patent Laid-Open No. 10-329562

  However, in the method of adjusting the magnetic path area as described above, since the magnetic resistance is inversely proportional to the magnetic path area through which the magnetic flux passes, even if the magnetic path area is changed slightly, the magnetic resistance of the magnetic circuit changes greatly. End up. For this reason, the entire IT characteristic of the driving force transmission device shifts in the vertical direction of the torque, and the torque may deviate from the standard value particularly at a low current side or a high current side current. As a result, since the torque cannot be increased or decreased by a specific current range, there may be a case where the transmission torque characteristics satisfying the required standard values at a plurality of locations cannot be obtained for each current value.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a driving force transmission device including an electromagnetic clutch capable of easily adjusting a transmission torque characteristic in a specific current region, and its manufacture. It is to provide a method.

  In order to solve the above-described problem, a driving force transmission device according to claim 1 includes a first rotating member having a cylindrical portion, and a shaft-shaped second rotation rotatably disposed coaxially within the first rotating member. A member, a first clutch that transmits torque between the first rotating member and the second rotating member, a second clutch juxtaposed in the axial direction of the first clutch, the first clutch, and the first clutch A cam mechanism that is provided between two clutches and that presses the first clutch by relative rotation of the first rotating member and the second rotating member that is transmitted via the second clutch, The cam mechanism is provided so as to be rotatable integrally with the second rotating member and movable in the axial direction, and has an annular main cam that is disposed on the first clutch side and presses the first clutch. Axial plate thickness or axially opposite And summarized in that with a clutch pressing member capable of adjusting the stiffness by changing the first clutch side of the edge shapes.

  According to the above configuration, the axial thickness of the clutch pressing member provided on the annular main cam of the cam mechanism for pressing the first clutch of the driving force transmission device, and the end face shape on the side opposite to the first clutch in the axial direction are changed. Thus, the rigidity of the clutch pressing member is adjusted to change the contact position of the first clutch. Thereby, since the friction torque of the first clutch changes, the transmission torque in a specific current region can be increased or decreased.

  The gist of the invention according to claim 2 is that, in the driving force transmission device according to claim 1, the clutch pressing member is formed in an annular shape separately from the main body member of the main cam.

  According to the above configuration, since the clutch pressing member of the main cam that presses the first clutch of the driving force transmission device is formed separately from the main cam body member, the clutch pressing member having different rigidity according to the measured transmission torque value The torque can be adjusted by selecting and assembling the main cam body member.

  According to a third aspect of the present invention, there is provided a method for manufacturing the driving force transmission device, comprising: a first rotating member having a cylindrical portion; a shaft-shaped second rotating member that is coaxially disposed in the first rotating member; and the first rotating member. Between the first clutch that transmits torque between the first rotating member and the second rotating member, the second clutch juxtaposed in the axial direction of the first clutch, and between the first clutch and the second clutch And a cam mechanism that presses the first clutch by relative rotation between the first rotating member and the second rotating member that is transmitted via the second clutch, and the second clutch includes: A plurality of clutch plates that transmit torque between the first rotating member and the second rotating member; an armature that is axially movable on one side in the axial direction of each clutch plate; and each clutch Other axial direction of the plate A magnetic path forming member that rotates integrally with the first rotating member or the second rotating member, and an electromagnetic coil that is disposed with the magnetic path forming member interposed between the armature and the electromagnetic coil. An IT characteristic that includes a yoke that is supported and relatively rotatable with the first and second rotating members, and that indicates a relationship between an energization amount to the electromagnetic coil and a torque transmitted by each clutch plate A clutch pressing member having different rigidity is formed on the main cam of the cam mechanism that presses the first clutch in accordance with the measurement process for measuring the I-T characteristic measured in the measurement process, And an adjusting step for adjusting the characteristics.

  According to the above configuration, in the driving force transmission device, the clutch pressing member having different rigidity can be selected according to the measured transmission torque and the main cam of the cam mechanism can be assembled, so that the measurement result is larger than the torque standard value (target value). In this case, a low-rigidity clutch pressing member can be selected, and if it is smaller than the standard value, a high-rigidity product can be selected. Thereby, the transmission torque corresponding to the specific current value can be adjusted within the standard value.

  ADVANTAGE OF THE INVENTION According to this invention, the driving force transmission apparatus provided with the electromagnetic clutch which can adjust the transmission torque characteristic in a specific electric current range easily, and its manufacturing method can be provided.

1 is a longitudinal sectional view showing a schematic configuration of a driving force transmission device according to a first embodiment of the present invention. The side view which shows schematic structure of the clutch press member of the cam mechanism (main cam) of FIG. The graph which shows the IT characteristic for every clutch press member of a main cam. The side view which shows schematic structure of the clutch press member of the main cam which concerns on 2nd Embodiment. The side view which shows schematic structure of the clutch press member of the main cam which concerns on 3rd Embodiment. The front view which shows schematic structure of the clutch press member of the main cam seen from the rear housing side which concerns on 4th Embodiment. The front view which shows schematic structure of the clutch press member of the main cam seen from the rear housing side which concerns on 5th Embodiment.

Next, a driving force transmission device mounted on a vehicle according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a schematic configuration of a driving force transmission device 1 according to a first embodiment of the present invention. A driving force transmission device (for example, an electronically controlled coupling) 1 is disposed between the propeller shaft and the rear differential, and generates a torque when a rotational difference occurs between the front and rear wheels so that the driving force is transmitted to the rear wheel. Drive. As shown in FIG. 1, the driving force transmission device 1 is rotated in a cylinder of a bottomed cylindrical outer housing (input case) 3 that is rotatably accommodated in a coupling case (not shown). And an axial inner shaft (output shaft) 4 that is freely coaxially arranged.

  The outer housing 3 as the first rotating member has an annular rear housing 6 fitted into the opening end 3b. The inner shaft 4 as the second rotating member is rotatably supported by a needle bearing 7 provided on the inner periphery of the rear housing 6 and a ball bearing 8 provided in the cylinder of the front housing 3. The cylinder of the outer housing 3 is sealed by a fitting portion between the outer housing 3 and the rear housing 6 and seal members 9 and 10 provided between the inner periphery of the rear housing 6 and the outer periphery of the inner shaft 4. Sealed and lubricating oil is contained in the cylinder.

  The bottom portion 3 a of the outer housing 3 is connected to a flange portion (not shown) provided on a propeller shaft (not shown) by bolt fastening via a bolt hole 11. Thereby, the outer housing 3 rotates by the input of the driving force which the engine (not shown) which is a drive source generate | occur | produces. Further, a connecting portion (spline fitting portion) 12 (not shown) with a rear differential (not shown) is formed on the inner periphery of the shaft end (right side in the drawing) of the inner shaft 4 supported by the needle bearing 7. . That is, when the vehicle is mounted on the driving force transmission device 1, the outer housing 3 is connected to the front wheel side which is the main driving wheel, and the inner shaft 4 is connected to the rear wheel side which is the auxiliary driving wheel.

  Further, a main clutch 13 capable of connecting the outer housing 3 and the inner shaft 4 so as to be able to transmit torque is provided in a cylinder of the outer housing 3, and a pilot clutch is provided in the axial direction of the main clutch 13 and on the rear housing 6 side. 14 are juxtaposed. A cam mechanism 15 is provided between the main clutch 13 and the pilot clutch 14.

  The main clutch 13 as the first clutch includes a wet multi-plate friction clutch having a plurality of clutch plates in which an outer clutch plate 16 and an inner clutch plate 17 which are provided so as to be movable in the axial direction are alternately arranged. It has been adopted. Specifically, each outer clutch plate 16 is spline-fitted to the inner periphery of the outer housing 3 and each inner clutch plate 17 is spline-fitted to the outer periphery of the inner shaft 4 so that each outer clutch plate 16 can move in the axial direction and has a corresponding outer The housing 3 or the inner shaft 4 is provided so as to be integrally rotatable. The main clutch 13 connects the outer housing 3 and the inner shaft 4 so that torque can be transmitted by the outer clutch plates 16 and the inner clutch plates 17 being pressed in the axial direction and frictionally engaged with each other. It has become.

  Next, the cam mechanism 15 is spline-fitted to the outer periphery of the inner shaft 4 so that the cam mechanism 15 can rotate integrally with the inner shaft 4 and can move in the axial direction, and the inner shaft 4 can rotate. And a cam follower 20 interposed between the pilot cam 19 and the main cam 18. Both the main cam 18 and the pilot cam 19 are formed in an annular shape. The main cam 18 is disposed on the main clutch 13 side, and the pilot cam 19 is disposed on the rear housing 6 side. The main cam 18 is spline-fitted to the pilot clutch 14 side of the spline groove of the inner shaft 4 to which the inner clutch plate 17 is fitted. The pilot cam 19 is in contact with a needle bearing 21 provided between the pilot cam 19 and the rear cam 6, and is supported so as to be relatively rotatable with a predetermined distance from the rear housing 6.

  A plurality of U-shaped grooves inclined with respect to the circumferential direction are formed on the opposing surfaces of the main cam 18 and the pilot cam 19 so as to oppose each other, and the cam follower 20 is disposed in each of the opposing U-shaped grooves. In this state, it is held between the main cam 18 and the pilot cam 19. The cam mechanism 15 causes the main cam 18 and the pilot cam 19 to rotate relative to each other so that the main cam 18 and the pilot cam 19 are separated from each other, that is, the main cam 18 moves in the axial direction toward the main clutch 13. ing.

  In the pilot clutch 14 as the second clutch, a plurality of clutch plates that are movable in the axial direction, that is, the outer clutch plate 23 and the inner clutch plate 24 are alternately arranged in the same manner as the main clutch 13. A multi-plate friction clutch is adopted. Specifically, each outer clutch plate 23 is splined to the inner periphery of the outer housing 3 and the inner clutch plate 24 is splined to the outer periphery of the pilot cam 19, so that each outer clutch plate 23 can move in the axial direction and has a corresponding outer The housing 3 or the pilot cam 19 is provided so as to be rotatable together.

  The pilot clutch 14 is configured to connect the outer housing 3 and the pilot cam 19 so that torque can be transmitted by the outer clutch plate 23 and the inner clutch plate 24 being pressed in the axial direction and frictionally engaged with each other. It has become. The outer clutch plate 23 includes an outer peripheral side sliding portion and an inner peripheral side sliding portion (not shown), and both the sliding portions are connected by a plurality of bridge portions (not shown). An arcuate space is formed between the adjacent bridge portions, thereby preventing the magnetic flux from being short-circuited between the outer peripheral side sliding portion and the inner peripheral side sliding portion. Similarly, the inner clutch plate 24 includes an outer peripheral side sliding portion and an inner peripheral side sliding portion (not shown), and both the sliding portions are connected by a plurality of bridge portions (not shown).

  Therefore, the pilot cam 19 having the cam follower 20 sandwiched between the main cam 18 and the main cam 18, that is, the inner shaft 4, rotates together with the outer cam 3 and the pilot cam when the pilot clutch 14 is not operated. 19, a rotational difference corresponding to the rotational difference between the outer housing 3 and the inner shaft 4 is generated. The pilot clutch 14 is operated to connect the outer housing 3 and the pilot cam 19 so that torque can be transmitted, thereby camming torque based on the rotational difference between the outer housing 3 and the inner shaft 4 (pilot cam 19). It is transmitted to the mechanism 15.

  That is, in the driving force transmission device 1, the torque based on the rotational difference between the outer housing 3 and the inner shaft 4 is transmitted to the cam mechanism 15 by the operation of the pilot clutch 14, and the cam mechanism 15 is connected to the main cam 18 generated by the torque. Based on the rotation difference from the pilot cam 19, the main cam 18 is moved to the axial main clutch 13 side. That is, the cam mechanism 15 converts the torque based on the rotation difference between the outer housing 3 and the inner shaft 4 transmitted through the pilot clutch 14 into an axial thrust (pressing force) and amplifies it. When the main cam 18 presses the main clutch 13, the main clutch 13 is operated, that is, the outer housing 3 and the inner shaft 4 are connected so as to transmit torque.

  Here, the pilot clutch 14 is configured as an electromagnetic clutch using the electromagnetic coil 25 as a drive source. That is, the rear housing 6 as a magnetic path forming member includes an annular outer peripheral cylindrical portion 26, an annular inner peripheral cylindrical portion 27 provided in the outer peripheral cylindrical portion 26, an outer peripheral cylindrical portion 26 and an inner peripheral cylindrical portion 27. And an annular magnetic path blocking portion 28 provided between the two. The outer peripheral cylindrical portion 26 as an outer peripheral member and the inner peripheral cylindrical portion 27 as an inner peripheral member are made of a magnetic material (for example, iron), and the magnetic path blocking portion 28 as a magnetic path blocking member is a non-magnetic material ( For example, stainless steel).

  The rear housing 6 is formed with an annular groove 29 that opens to the outside of the outer housing 3 (on the side opposite to the outer housing 3, the right side in the figure), and the electromagnetic coil 25 is surrounded by the yoke 30 and is annular groove 29. Is housed inside. The yoke 30 is supported so as to be relatively rotatable with the rear housing 6 and the outer housing 3 by a ball bearing 31 provided in the inner peripheral cylindrical portion 27, and an air gap G1 is formed between the yoke 30 and the outer peripheral cylindrical portion 26. In addition, an air gap G <b> 2 is formed between the yoke 30 and the inner peripheral cylinder portion 27.

  An annular armature 32 is slid in the cylinder of the outer housing 3 in the axial direction at a position where the outer clutch plate 23 and the inner clutch plate 24 are sandwiched between the armature 32 and the rear housing 6. The spline is movably fitted.

  In the pilot clutch 14, the magnetic flux generated by energization of the electromagnetic coil 25 is prevented from being short-circuited in the rear housing 6 by the magnetic path interrupting portion 28, and the yoke 30 and the outer peripheral cylindrical portion 26 of the rear housing 6 are prevented. The outer side sliding part of the outer clutch plate 23 and the inner clutch plate 24, the armature 32, the inner side sliding part of the outer clutch plate 23 and the inner clutch plate 24, the inner peripheral cylindrical part 27 and the yoke 30 of the rear housing 6 A passing magnetic circuit is formed. Due to this magnetic induction action, the armature 32 is attracted to the electromagnetic coil 25 side and moved so as to sandwich the outer clutch plates 23 and the inner clutch plates 24 between the rear housing 6 and the outer clutch plates 23 and the inner clutches. The clutch plate 24 is frictionally engaged.

  As described above, the driving force transmission device 1 can control the operation of the pilot clutch 14 through the power supply to the electromagnetic coil 25. The operation of the main clutch 13, that is, the torque that can be transmitted between the outer housing 3 and the inner shaft 4 can be freely controlled through the operation of the pilot clutch 14.

  Next, a mechanism for adjusting the IT characteristic by the clutch pressing member 33 of the cam mechanism 15 will be described. 2 is a side view showing a schematic configuration of the clutch pressing member 33 of the cam mechanism 15 (main cam 18) of FIG. 1 according to the first embodiment, and FIG. 3 is an IT for each clutch pressing member 33 of the main cam 18. It is a graph which shows a characteristic. The IT characteristic represents the relationship between the energization amount (current I (A)) to the electromagnetic coil 25 and the torque capacity (torque T (Nm)) that can be transmitted by the driving force transmission device 1. As shown in FIG. 3, a transmission torque characteristic almost proportional to the current can be obtained. The transmission torque of the driving force transmission device 1 is represented by an addition formula of the friction torque of the main clutch 13 and the friction torque of the pilot clutch 14.

  Here, the clutch pressing member 33 of the cam mechanism 15 is formed separately from the main cam 18 main body member, and each annular clutch pressing member 33 having a different axial plate thickness and an end surface shape on the side opposite to the main clutch is provided. The main cam 18 body member provided in common is integrally assembled and fixed by press-fitting, for example. At this time, the contact position of the main clutch 13 changes depending on the rigidity of the clutch pressing member 33. For example, when the clutch pressing member 33 is deformed to the side opposite to the main clutch, the contact position moves in a direction in which the friction radius decreases. As shown in FIG. 2, the rigidity of the clutch pressing member 33 can be increased by increasing the plate thickness of the clutch pressing member 33 in the axial direction over the entire circumference (for reference, the shape of the conventional clutch pressing member 33 is (Shown with a dashed line). For this reason, while increasing a torque value as a whole, the torque fall in a high current region can be suppressed, for example. A broken line (a) in FIG. 3 indicates the IT characteristic of the first embodiment.

  Next, FIGS. 4 and 5 are side views showing a schematic configuration of the clutch pressing member 33 of the main cam 18 according to the second and third embodiments. As shown in FIG. 4, the rigidity can be lowered by reducing the plate thickness of the outer peripheral portion of the clutch pressing member 33. For this reason, for example, the torque can be reduced only in the high current region. A broken line (b) in FIG. 3 indicates the IT characteristic of the second embodiment. Further, as shown in FIG. 4, the rigidity can be lowered by reducing the plate thickness of the clutch pressing member 33 in the axial direction over the entire circumference. For this reason, the torque can be reduced overall. A broken line (c) in FIG. 3 indicates the IT characteristic of the third embodiment.

  6 and 7 are front views showing a schematic configuration of the clutch pressing member 33 of the main cam 18 as viewed from the rear housing side according to the fourth and fifth embodiments. As shown in FIG. 6, the rigidity of the clutch pressing member 33 can be increased by providing a plurality of ribs 34 that protrude from the end surface of the clutch pressing member 33 on the side opposite to the main clutch and are radially arranged in the circumferential direction. it can. In addition, as shown in FIG. 7, the rigidity of the clutch pressing member 33 can be lowered by providing an annular groove 35 at a predetermined radial position on the end surface of the clutch pressing member 33 on the side opposite to the main clutch.

Next, a method for manufacturing the driving force transmission device 1 will be described.
First, the inner shaft 4, the main clutch 13, the cam mechanism 15 and the pilot clutch 14 are assembled to the outer housing 3, and the rear housing 6 is screwed to the opening end 3 b of the outer housing 3. Subsequently, the outer housing 3 assembled with each of the above members is attached to, for example, a test machine (not shown) having a predetermined yoke and an electromagnetic coil supported by the yoke, and its IT characteristic is measured (measuring process) ). Then, the clutch pressing member 33 having different rigidity is provided on the main cam 18 so as to increase or decrease the torque of the IT characteristic based on the measurement result (adjustment process). Thereafter, the drive force transmission device 1 is manufactured by assembling the yoke 30 and the electromagnetic coil 25.

  Next, the operation and effect of the driving force transmission device 1 according to the present embodiment configured as described above will be described.

  According to the above configuration, the driving force transmission device 1 changes the axial plate thickness of the annular clutch pressing member 33 provided on the main cam 18 of the cam mechanism 15 that presses the main clutch 13 and the end surface shape on the side opposite to the main clutch. Thus, the rigidity of the main cam 18 is adjusted, and the contact position of the main clutch 13 is moved. According to the first to third embodiments, the plate thickness is increased or decreased over the entire circumference with a predetermined width in the radial direction on the end surface of the clutch pressing member 33 on the side opposite to the main clutch. Further, according to the fourth and fifth embodiments, a plurality of ribs 34 or annular grooves 35 that are radially arranged at equal intervals in the circumferential direction are formed on the end surface of the clutch pressing member 33 on the side opposite to the main clutch. To do. The clutch pressing member 33 of the cam mechanism 15 is formed separately from the main cam 18 main body member, and the main cam 18 main body member is provided with a common clutch pressing member 33 having different rigidity according to the measured transmission torque. The assembly is fixed.

  As a result, the friction torque of the main clutch 13 is changed by changing the rigidity of the clutch pressing member 33 of the main cam 18 and moving the contact position of the main clutch 13, that is, changing the friction radius. The transmission torque can be increased or decreased. Then, the clutch pressing member 33 having different rigidity is selected according to the measured torque value and assembled to the main cam 18 to adjust the transmission torque. When the measurement result is larger than the standard (target) value of the torque, the low-rigidity clutch pressing member 33 can be selected, and when the measurement result is smaller than the standard value, the high-rigidity product can be selected.

  Therefore, the torque corresponding to a specific current value (for example, a high current value) can be adjusted within the standard value. As a result, the transmission torque characteristic of the driving force transmission device 1 can be easily adjusted within the required standard value and can be adjusted to a predetermined value. In addition, if a plurality of types of clutch pressing members 33 having different rigidity are prepared and appropriately employed, the IT characteristic can be further precisely adjusted. In addition, the transmission torque characteristics can be adjusted by the clutch pressing member 33 even when torque fluctuations due to deformation or the like of the cam mechanism 15 occur.

  Furthermore, since the transmission torque characteristic can be adjusted by changing the rigidity of the main cam 18 of the cam mechanism 15 as described above, the yoke 30 that supports the electromagnetic coil 25 and the rear housing 6 can be adjusted like a conventional driving force transmission device. It is not necessary to adjust the air gaps G1 and G2 with an interposed adjustment member or the like.

  As described above, according to the first to fifth embodiments of the present invention, a driving force transmission device including an electromagnetic clutch capable of easily adjusting a transmission torque characteristic in a specific current region, and a manufacturing method thereof. Can provide.

  As mentioned above, although embodiment which concerns on this invention was described, this invention can also be implemented with another form.

  In the above-described embodiment, the shape for adjusting the rigidity of the clutch pressing member 33 is provided in a planar shape, a radial shape, or an annular shape. However, the shape is not limited to this and may be any other shape that can increase or decrease the rigidity.

  In the above embodiment, the driving force transmission device 1 is provided in the driving force transmission path to the auxiliary driving wheel side in the four-wheel drive vehicle, and the torque transmitted to the auxiliary driving wheel is controlled. You may use for the differential apparatus etc. which have the function as an apparatus.

  Furthermore, in the said embodiment, although the electromagnetic clutch was applied to the drive force transmission device 1 provided with the main clutch 13 and the cam mechanism 15 which amplify the torque transmitted by the electromagnetic clutch (pilot clutch 14), it is not limited to this. You may apply to the electromagnetic clutch only or the other apparatus which has an electromagnetic clutch.

1: driving force transmission device, 3: outer housing (first rotating member), 4: inner shaft (second rotating member), 5, 7, 8, 21, 31: bearing, 6: rear housing (magnetic path forming member) ), 9, 10: seal member, 11: bolt hole, 12: coupling portion, 13: main clutch (first clutch), 14: pilot clutch (second clutch), 15: cam mechanism, 16, 23: outer clutch Plate, 17, 24: Inner clutch plate, 18: Main cam,
19: Pilot cam, 20: Cam follower, 25: Electromagnetic coil, 26: Outer cylinder part,
27: inner peripheral cylinder part, 28: magnetic path blocking part, 29: annular groove, 30: yoke, 32: armature, 33: clutch pressing member, 34: rib, 35: groove,
G1, G2: Air gap

Claims (3)

A first rotating member having a cylindrical portion;
A shaft-shaped second rotating member that is coaxially disposed rotatably in the first rotating member;
A first clutch for transmitting torque between the first rotating member and the second rotating member;
A second clutch juxtaposed in the axial direction of the first clutch;
A cam that is provided between the first clutch and the second clutch and presses the first clutch by relative rotation between the first rotating member and the second rotating member that is transmitted through the second clutch. A mechanism,
The cam mechanism has an annular main cam that is provided so as to be rotatable integrally with the second rotating member and movable in the axial direction, and is disposed on the first clutch side and presses the first clutch.
The driving force transmitting device according to claim 1, wherein the main cam includes a clutch pressing member capable of adjusting rigidity by changing an axial plate thickness or an end face shape on the side opposite to the first clutch in the axial direction. The driving force transmission device according to claim 1,
The driving force transmitting device according to claim 1, wherein the clutch pressing member is formed in an annular shape separately from the main body member of the clutch cam. A first rotating member having a cylindrical portion;
A shaft-shaped second rotating member that is coaxially disposed rotatably in the first rotating member;
A first clutch for transmitting torque between the first rotating member and the second rotating member;
A second clutch juxtaposed in the axial direction of the first clutch;
A cam that is provided between the first clutch and the second clutch and presses the first clutch by relative rotation between the first rotating member and the second rotating member that is transmitted through the second clutch. A mechanism,
The second clutch is provided with a plurality of clutch plates for transmitting torque between the first rotating member and the second rotating member, and axially movable on one side in the axial direction of each clutch plate. The magnetic path forming member is disposed between the armature and the magnetic path forming member that rotates integrally with the first rotating member or the second rotating member provided on the other axial side of each clutch plate. An electromagnetic coil disposed between and a yoke that supports the electromagnetic coil and is rotatable relative to the first and second rotating members;
A measurement step of measuring an IT characteristic indicating a relationship between an energization amount to the electromagnetic coil and a torque transmitted by each clutch plate;
According to the IT characteristic measured in the measuring step, a clutch pressing member having different rigidity is formed on the main cam of the cam mechanism that presses the first clutch having different rigidity, and the IT characteristic is adjusted. And a driving force transmission device manufacturing method comprising: an adjustment step.

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