JP5180915B2 - Torque limiter device - Google Patents

Description

  The present invention relates to a torque limiter device, and more particularly to a torque limiter device for limiting torque transmitted from an engine-side member to a transmission-side shaft.

  In a vehicle, a torque limiter device for limiting the transmitted torque may be provided between the engine and the transmission in order to prevent the transmission and the like from being damaged by excessive torque from the engine. In this torque limiter device, for example, one or more friction facings are sandwiched by a pair of plates with a predetermined clamping force from both sides, the input side is connected to a flywheel or the like as a member on the engine side, and the output side is transmitted It is connected to the input shaft on the side.

  This type of torque limiter device is connected to a drive plate having a friction coupling portion on the outer peripheral portion, a transmission torque limiting portion that sandwiches the friction coupling portion of the drive plate with a predetermined clamping force by a pair of plates, and an input shaft of the transmission And a damper mechanism provided between them (see, for example, Patent Document 1). In this device, a pair of plates (or a damper cover provided on the outer peripheral portion of the friction coupling portion) sandwiching the friction coupling portion is coupled to the flywheel.

  In this torque limiter device, the torque of the engine is transmitted from the flywheel to the drive plate via the friction coupling portion, and further transmitted to the driven side member and the input shaft of the transmission via the damper mechanism. And when the torque from an engine exceeds predetermined torque, slip will generate | occur | produce between a friction connection part and a plate. As a result, the torque more than that limited by the transmission torque limiting unit is not transmitted to the transmission side, and damage to the transmission due to excessive torque can be prevented.

JP 2006-17226 A

  In a vehicle provided with the conventional torque limiter device as described above, the case in which the torque limiter device is housed is not sealed, and muddy water or the like may enter the case from the outside. Many. For this reason, foreign matter such as muddy water enters the portion of the torque limiter device where the friction material is provided. When such foreign matter such as muddy water enters the inside of the apparatus, the friction material may be abnormally worn or a desired transmission torque limiting function may not be achieved.

  Therefore, a configuration for efficiently discharging muddy water or the like that has entered the portion where the torque limiter device is disposed is required.

  The subject of this invention is providing the torque limiter apparatus which enabled it to discharge | emit foreign substances, such as muddy water which penetrate | invaded the part in which the torque limiter apparatus was arrange | positioned, to the apparatus exterior efficiently.

  Another object of the present invention is to realize a configuration for discharging muddy water as described above with a simple configuration.

  A torque limiter device according to claim 1 is a device for limiting torque transmitted from an engine-side member to a transmission-side shaft, and includes a drive member, an input-side member, an output-side member, a damper mechanism, The transmission torque limiting unit and the flow path are provided. The drive member can be attached to a member on the engine side, and has a friction coupling surface on the outer peripheral portion. The input side member has a friction material on the outer periphery. The output side member has an engaging portion that can engage with the transmission side shaft. The damper mechanism elastically connects the input side member and the output side member in the circumferential direction. The transmission torque limiting unit holds the friction material of the input side member between the friction connecting surfaces of the drive member and limits the torque transmitted from the drive member to the transmission side shaft. The flow path is formed in the drive member and the transmission torque limiting portion, and is for discharging foreign matter accumulated on the outer peripheral portion of the transmission torque limiting portion to the outside of the transmission torque limiting portion.

  Further, the drive member has a plurality of concave portions formed side by side in the circumferential direction and recessed radially outward, and the transmission torque limiting portion has a pressure ring, a cone spring, and a support member. . The pressure ring is disposed to face the friction coupling surface with the friction material of the input side member interposed therebetween, and has a plurality of engaging portions that engage with the plurality of concave portions of the drive member on the outer peripheral portion. The cone spring has an outer diameter smaller than the maximum inner diameter of the recess of the drive member, and presses the pressure ring against the friction coupling surface. The support member is fixed to the drive member and supports the cone spring. The support member has an open portion so that a part of a gap formed between the outer periphery of the cone spring and the concave portion is exposed to the outside. And a flow path contains the clearance gap formed between the outer periphery of a cone spring, and a recessed part, and the open part of a supporting member.

  The support member is an annular plate, and has a plurality of recesses recessed radially outward at positions where at least a part of the inner periphery overlaps with the plurality of recesses of the drive member in the axial direction. Yes.

  In this apparatus, the torque transmitted to the drive member is transmitted to the output side member via the friction material of the input side member, and is transmitted to the shaft on the transmission side. When an excessive torque is input from the engine side, the transmission torque in the friction material portion is limited by the action of the transmission torque limiting unit.

Here, since the flow path is provided, it is possible to enter the inside of the apparatus, for example, to remove foreign matter accumulated on the outer peripheral portion of the transmission torque limiting unit to the outside of the transmission torque limiting unit, and each part including the friction material Wear and damage can be suppressed. Further, Ru can realize stable transmission torque limiting function.

Further, a flow path is formed by the gap between the outer periphery of the cone spring and the concave portion and the open portion of the support member, and foreign matter such as muddy water accumulated in the transmission torque limiting portion is discharged to the outside through this flow path. it is Ru can.

Furthermore, since the concave portion of the drive member and the concave portion of the support member are at least partially overlapped in the axial direction, this overlapping portion becomes a flow path.

The torque limiter device according to claim 2 is the device according to claim 1 , wherein each of the plurality of engaging portions of the pressure ring is a protrusion protruding radially outward, and the pressure ring and the support member are one plate member. It is formed from.

  Here, by forming a portion corresponding to the concave portion of the support member as a protrusion of the pressure ring, the support member and the pressure ring can be simultaneously formed from one plate member, thereby reducing the cost and facilitating the manufacture. be able to.

A torque limiter device according to a third aspect is a device for limiting the torque transmitted from the engine side member to the transmission side shaft, and includes a drive member, an input side member, an output side member, a damper mechanism, The transmission torque limiting unit and the flow path are provided. The drive member can be attached to a member on the engine side, and has a friction coupling surface on the outer peripheral portion. The input side member has a friction material on the outer periphery. The output side member has an engaging portion that can engage with the transmission side shaft. The damper mechanism elastically connects the input side member and the output side member in the circumferential direction. The transmission torque limiting unit holds the friction material of the input side member between the friction connecting surfaces of the drive member and limits the torque transmitted from the drive member to the transmission side shaft. The flow path is formed in the drive member and the transmission torque limiting unit, and discharges foreign matter accumulated on the outer periphery of the transmission torque limiting unit to the outside of the transmission torque limiting unit.

  The drive member has a plurality of recesses formed side by side in the circumferential direction and recessed outward in the radial direction. The transmission torque limiting unit includes a pressure ring, a cone spring, and a support member. The pressure ring is disposed to face the friction coupling surface with the friction material of the input side member interposed therebetween, and has a plurality of engaging portions that engage with the plurality of concave portions of the drive member on the outer peripheral portion. The cone spring has an outer diameter smaller than the maximum inner diameter of the recess of the drive member, and presses the pressure ring against the friction coupling surface. The support member has a plurality of plate members arranged side by side in the circumferential direction and fixed to the drive member, and supports the cone spring.

  The support member has an open portion so that a part of a gap formed between the outer periphery of the cone spring and the concave portion is exposed to the outside, and the flow path is formed between the outer periphery of the cone spring and the concave portion. And an opening portion of the support member.

  The support member can be formed in a ring shape, but can also be constituted by, for example, a plurality of arc-shaped plate members. Therefore, in the apparatus according to this claim, the support member is constituted by a plurality of plate members. Thereby, the yield of material can be improved.

  When the support member is constituted by a plurality of plate members, the “open portion” of the support member corresponds to a gap between adjacent plate members.

  In the present invention as described above, foreign matter such as muddy water that has entered the portion where the torque limiter device is disposed can be discharged to the outside of the device, and wear and damage of each portion can be suppressed.

Sectional drawing of the torque limiter apparatus with a flywheel as one Embodiment of this invention. The front view of the said torque limiter apparatus. The enlarged view of the transmission torque limiting part of the said apparatus. FIG. 3 is an enlarged partial view of FIG. 2. The cross-sectional enlarged partial view which shows other embodiment of this invention.

[overall structure]
FIG. 1 shows a cross-sectional view of a torque limiter device with a flywheel as one embodiment of the present invention. FIG. 2 shows a part of a front view of the torque limiter device with a flywheel. Although not shown in FIG. 1, the engine is disposed on the left side and the transmission is disposed on the right side.

  This torque limiter device 1 is provided between the crankshaft 2 of the engine and the transmission input shaft 3 for limiting the torque transmitted from the engine to the transmission. The torque limiter device 1 includes a flywheel 5 as a drive member, a clutch disk assembly 6, and a transmission torque limiting portion 7 including a part of the clutch disk assembly 6.

[Flywheel]
The flywheel 5 is a disk-shaped member, and has a hole 5a at the center and a disk portion 10 from the inner peripheral portion to the radial intermediate portion. A mass portion 11 is provided on the outer peripheral side of the disc portion 10. The hole 5a in the center portion is fitted into an in-row portion 2a formed on the end face of the crankshaft 2, whereby the flywheel 5 and the crankshaft 2 are positioned in the radial direction.

  A plurality of through holes 5 b arranged in the circumferential direction are formed in the inner peripheral portion of the disc portion 10. A plurality of bolts 12 are inserted into the through holes 5b, and the flywheel 5 can be fixed to the end face of the crankshaft 2 by screwing the plurality of bolts 12 into the screw holes of the crankshaft 2. Moreover, the disc part 10 has substantially the same axial thickness in all radial directions. The bolt 12 is a hexagon socket head cap bolt in which a hexagon hole into which a tightening tool is inserted is formed in the head.

  The mass portion 11 is formed thicker in the axial direction than the disc portion 10. On the surface of the mass portion 11 on the transmission side, a housing portion 14 that is recessed toward the engine side is formed as shown in an enlarged view in FIG. The housing portion 14 has a radial positioning surface 14a extending in the axial direction at the outer peripheral portion, and a friction coupling surface 14b is formed in a portion corresponding to the bottom surface (side wall surface on the engine side) of the housing portion 14.

  Further, on the engine side surface of the flywheel 5, a plurality of recesses 15 that are recessed toward the transmission side are formed at the boundary between the disc portion 10 and the mass portion 11. The plurality of recesses 15 are arranged side by side in the circumferential direction, and each of the plurality of recesses 15 is formed in an arc shape. Corresponding to the recess 15, a through hole 16 penetrating the recess 15 is formed on the opposite surface. The through-hole 16 is formed so that the engine side cannot be seen from the transmission side when viewed in the axial direction. More specifically, the inner diameter d1 of the frictional connection surface 14b is formed to be smaller than the outermost diameter d2 of the disc portion 10 in the portion where the through hole 16 is formed. For this reason, the through hole 16 is inclined radially outward from the transmission side where the frictional coupling surface 14b is formed toward the engine side.

  Further, in the portion where the through-hole 16 of the flywheel 5 is formed, the inner peripheral end of the friction coupling surface 14 b has an inclined portion 16 a whose inner diameter gradually increases toward the through-hole 16. The inclined portion 16a forms a part of the through hole 16. Depending on the direction of the inclined portion 16a and the through hole 16, foreign matter such as muddy water from the inner peripheral side can be smoothly discharged to the outside of the apparatus.

[Clutch disc assembly]
The clutch disc assembly 6 mainly elasticizes the clutch plate 20 and the retaining plate 21 as the input side member, the spline hub 22 as the output side member, and the clutch plate 20, the retaining plate 21 and the spline hub 22. And a plurality of torsion springs (damper mechanisms) 23 connected to each other.

  The clutch plate 20 and the retaining plate 21 are both annular members made of sheet metal, for example, and are arranged at a predetermined interval in the axial direction. The clutch plate 20 is disposed on the engine side, and the retaining plate 21 is disposed on the transmission side. A part of the outer peripheral portion of the retaining plate 21 is bent toward the clutch plate 20 and further bent toward the inner peripheral side. A portion of the retaining plate 21 bent to the inner peripheral side is fixed to the outer peripheral portion of the clutch plate 20 by a rivet 24. As a result, the clutch plate 20 and the retaining plate 21 rotate together.

  In addition, four window holes are formed at equal intervals in the rotation direction on the outer peripheral portions of the clutch plate 20 and the retaining plate 21, and the torsion spring 23 is supported by the window holes. Here, holes 20 a and 21 a are formed in the center portions of the clutch plate 20 and the retaining plate 21, respectively. The diameters of the holes 20a and 21a at the center of both plates 20 and 21 are larger than the mounting pitch circle P (see FIG. 1) of the bolts 12 for fixing the flywheel 5 to the crankshaft 2. Therefore, no components other than the spline hub 22 are arranged on the inner peripheral portion of the clutch disk assembly 6.

  The outer peripheral portion of the clutch plate 20 is formed to extend to the friction coupling surface 14 b of the flywheel 5. The outer peripheral surface of the clutch plate 20 is close to the radial positioning surface 14a of the accommodating portion 14 of the flywheel 5, and the radial positioning of the clutch plate 20 is performed by the radial positioning surface 14a.

  A plurality of friction materials 26 are disposed on the outer peripheral portion of the clutch plate 20. That is, the outer peripheral portion of the clutch plate 20 functions as a friction coupling plate. More specifically, as shown in FIG. 2, a plurality of arc-shaped holes 20 b are formed side by side in the circumferential direction on the outer peripheral portion of the clutch plate 20. A friction material 26 formed in an arc shape is attached to each of the plurality of arc-shaped holes 20b. The friction material 26 is mounted by press-fitting both end faces in the circumferential direction into the holes 20b. In the radial direction, a gap is formed between the friction material 26 and the hole 20b. The thickness of the friction material 26 is formed larger than the thickness of the clutch plate 20.

  Further, as shown in FIG. 2, a plurality of notches 20 c are formed at the outer peripheral end of the clutch plate 20. A sufficient gap is formed between the plurality of notches 20 c and the radial positioning surface 14 a of the accommodating portion 14 of the flywheel 5.

  The spline hub 22 includes a cylindrical boss 28 extending in the axial direction and a disc-shaped hub flange 29 extending from the boss 28 in the radial direction. The boss 28 and the hub flange 29 are integrally formed. A spline hole 28 a that engages the transmission input shaft 3 is formed in the inner peripheral portion of the boss 28. The hub flange 29 is formed with a plurality of notches arranged in the rotational direction. A torsion spring 23 is accommodated in each of the plurality of notches. A hole 29 a into which a tool for tightening the bolt 12 can be inserted is formed at a position corresponding to the plurality of bolts 12 in the radial intermediate portion of the hub flange 29. In this embodiment, the concentricity of the spline hole 28a with respect to the inrow portion 2a of the crankshaft 2 is suppressed to 1.0 mm or less, and is configured in the range of 0.2 to 0.3 mm.

  Bushings 30 are arranged between the hub flange 29 of the spline hub 22 and the clutch plate 20 and retaining plate 21. Each bush 30 is fixed to the clutch plate 20 and the retaining plate 21, and hysteresis torque is generated when each bush 30 rotates relative to the side surface of the hub flange 29.

[Transmission torque limiter]
As shown in FIGS. 1 to 3, the transmission torque limiting unit 7 includes the above-described friction material 26, a pressure ring 32 that holds the friction material 26 between the friction coupling surfaces 14 b of the flywheel 5, and a cone spring. 33 and a cover member 34 as a support member. The pressure ring 32 and the cone spring 33 are accommodated in the accommodating portion 14 of the flywheel 5 together with the friction material 26.

  The pressure ring 32 is a ring-shaped plate member, and a plurality of engagement protrusions 32a protruding outward in the radial direction are formed on the outer peripheral portion. On the other hand, as shown in an enlarged view in FIG. 4, a plurality of engaging recesses 14 c are formed on the outer peripheral surface of the accommodating portion 14 of the flywheel 5. The plurality of engaging recesses 14c are formed at equal intervals in the circumferential direction. Then, the engagement protrusion 32 a of the pressure ring 32 engages with the engagement recess 14 c of the flywheel 5, so that the pressure ring 32 is not rotatable relative to the flywheel 5 and is movable in the axial direction.

  As described above, the cone spring 33 is disposed inside the accommodating portion 14 of the flywheel 5, and the inner peripheral portion presses the pressure ring 32 toward the flywheel 5.

  The cover member 34 is a ring-shaped plate member, and is fixed to the transmission-side end surface of the mass portion 11 of the flywheel 5 by a plurality of rivets 36. The outer periphery of the cone spring 33 is supported. That is, the inner diameter of the cover member 34 is smaller than the outer diameter of the cone spring 33.

  Here, the cover member 34 and the pressure ring 32 are formed from one ring-shaped plate member. For this reason, a plurality of concave portions 34a (see FIG. 2) that are directed radially outward are formed in the inner peripheral edge portion of the cover member 34. Specifically, when the pressure ring 32 is punched out from one ring-shaped plate member, a recess 34a is formed in the remaining portion (cover member 34) at a portion corresponding to the engaging protrusion 32a. The recess 34 a functions as a flow path 40 (see FIG. 4) that communicates the outer peripheral portion of the friction material 26 of the clutch plate 20 and the outside of the torque limiter device 1.

[Flow path]
Next, the flow path 40 will be described in detail. As described above, the engagement protrusion 32a of the pressure ring 32 is engaged with the engagement recess 14c of the flywheel 5, but as is apparent from FIG. 4, the outer peripheral end surface of the engagement protrusion 32a and the engagement recess 14c. A gap is formed between the maximum inner peripheral surface of the two. Further, as is apparent from FIG. 3, the outer diameter of the cone spring 33 is smaller than the diameter of the radial positioning surface 14 a of the flywheel 5. Therefore, a sufficient gap is ensured between the outer diameter of the cone spring 33 and the maximum inner peripheral surface of the engaging recess 14c. Further, as is apparent from FIG. 2, the cover member 34 is arranged such that the recess 34 a is at the same angular position as the engagement recess 14 c of the flywheel 5. That is, the recess 34a of the cover member 34 and the engagement recess 14c of the flywheel 5 are disposed so as to overlap in the axial direction.

  Due to the arrangement of the members as described above, the outer peripheral portion of the friction material 26 communicates with the outside of the apparatus through the inner peripheral portion of the engaging concave portion 14 c of the flywheel 5 and the concave portion 34 a of the cover member 34. Thus, the flow path 40 for discharging the muddy water etc. which entered the inside of the apparatus to the outside is formed.

  Here, the housing portion in which the torque limiter device is accommodated is generally not sealed, and therefore muddy water or the like may enter the housing. Muddy water or the like that has entered the inside of the apparatus moves to the outside by centrifugal force as the apparatus rotates. For example, muddy water or the like that has entered between the clutch plate 20 and the flywheel 5 moves to the outer peripheral portion along the portion where the friction material 26 is not provided on the surface of the clutch plate 20. The same applies to the opposite surface of the clutch plate 20. And muddy water etc. accumulate mainly in the notch 20c part formed in the outer peripheral part of the clutch plate 20. FIG.

  However, the muddy water or the like that has moved to the outside as described above is discharged to the outside of the apparatus through the flow path 40 described above. Therefore, it is possible to prevent muddy water or the like from accumulating particularly near the friction material 26, to prevent abnormal wear of the friction material 26, etc., and to realize a stable transmission torque limit.

[Transmission torque limit]
In such a configuration, the torque that can be transmitted is determined by the urging force of the cone spring 33, the friction coefficient of the friction material 26, and the effective radius of the friction coupling portion, and a torque that exceeds this transmittable torque is input from the engine side. Then, slip occurs in the frictional connecting portion, and the transmission torque is limited to a predetermined torque.

[Assembly and assembly of torque limiter device]
When assembling the torque limiter device as described above, first, the clutch disk assembly 6 is assembled. Next, the bolt 12 is inserted into the bolt mounting hole of the flywheel 5. Then, the clutch disk assembly 6, the pressure ring 32, and the cone spring 33 are arranged in this order in the accommodating portion 14 of the flywheel 5, and finally the cover member 34 is fixed to the flywheel 5 by the rivets 36.

  The flywheel-equipped torque limiter device obtained as described above is mounted on the crankshaft 2. Specifically, the inrow portion 2 a of the crankshaft 2 is fitted into the center hole 5 a of the flywheel 5, and the entire torque limiter device is set on the crankshaft 2. Then, the plurality of bolts 12 are tightened into screw holes formed on the end face of the crankshaft. At this time, the tool is inserted into the hexagon hole for the tightening tool formed in the head of the bolt 12 through the hole 29a formed in the hub flange 29 of the spline hub 22, and the bolt 12 is tightened and fixed.

[Feature]
(1) Since the flow path 40 is provided on the outer peripheral portion of the transmission torque limiting portion 7, foreign matter such as muddy water that has entered the inside of the apparatus can be efficiently discharged to the outside. For this reason, wear and damage of each part including the friction material 26 can be suppressed. In addition, a stable transmission torque limiting function can be realized.

  (2) Since the through-hole 16 is formed in the flywheel 5 and foreign matter such as muddy water is guided to the back side of the flywheel 5 through the through-hole 16, the intrusion of muddy water or the like into the friction connecting portion is suppressed. Can do.

  (3) The flow path 40 can be realized with a simple configuration by the gap between the outer periphery of the cone spring 33 and the engagement recess 14 c of the flywheel 5 and the recess 34 a of the cover member 34.

  (4) Since the portion corresponding to the concave portion 34a of the cover member 34 is the engaging protrusion 32a of the pressure ring 32, these members can be formed simultaneously from one plate member, reducing the cost and manufacturing. Can be made easier.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various changes or modifications can be made without departing from the scope of the present invention.

  (A) FIG. 5 shows a modification of the cover member. In the embodiment, the cover member is formed in an annular shape, but in this embodiment, the cover member is formed by a plurality of arc-shaped members 42. Other configurations are the same as those in the above embodiment.

  In such an embodiment, the yield of the cover member is improved, and cost reduction can be realized.

  (B) The shape and number of friction materials are not limited to the above embodiment. For example, each of the plurality of friction materials may be circular.

1 Torque limiter device 2 Crankshaft 3 Transmission input shaft 5 Flywheel (drive member)
6 Clutch disc assembly 7 Transmission torque limiting portion 14b Friction connecting surface 14c Engaging recess 20 Clutch plate (input side member)
21 Retaining plate (input side member)
22 Spline hub (output side member)
23 Torsion spring 26 Friction material 32 Pressure ring 32a Engagement projection 33 Cone spring 34 Cover member (support member)
40 channels

Claims (3)

A torque limiter device for limiting the torque transmitted from the engine side member to the transmission side shaft,
A drive member that can be mounted on a member on the engine side and has a friction coupling surface on the outer periphery; and
An input side member having a friction material on the outer peripheral portion;
An output side member having an engaging portion engageable with the transmission side shaft;
A damper mechanism for elastically connecting the input side member and the output side member in a circumferential direction;
A transmission torque limiter for holding the friction material of the input side member between the friction connecting surfaces of the drive member and limiting the torque transmitted from the drive member to the transmission side shaft;
A flow path formed in the drive member and the transmission torque limiting portion, for discharging foreign matter accumulated on the outer peripheral portion of the transmission torque limiting portion to the outside of the transmission torque limiting portion;
Equipped with a,
The drive member has a plurality of recesses formed side by side in the circumferential direction and recessed outward in the radial direction,
The transmission torque limiter is
A pressure ring having a plurality of engaging portions that are disposed opposite to the friction coupling surface across the friction material of the input side member and engage with a plurality of concave portions of the drive member on an outer peripheral portion;
A cone spring having an outer diameter smaller than the maximum inner diameter of the recess of the drive member, and pressing the pressure ring against the friction coupling surface;
A support member fixed to the drive member and supporting the cone spring;
Have
The support member has an open portion so that a part of a gap formed between the outer periphery of the cone spring and the recess is exposed to the outside.
The flow path includes a gap formed between an outer periphery of the cone spring and the recess, and an open portion of the support member,
The support member is a plate formed in an annular shape, and has a plurality of recesses recessed radially outward at a position where at least a part thereof overlaps with the plurality of recesses of the drive member in the axial direction on the inner periphery. Yes,
Torque limiter device. Each of the plurality of engaging portions of the pressure ring is a protrusion protruding radially outward,
The pressure ring and the support member are formed from one plate member.
The torque limiter device according to claim 1 . A torque limiter device for limiting the torque transmitted from the engine side member to the transmission side shaft,
A drive member that can be mounted on a member on the engine side and has a friction coupling surface on the outer periphery; and
An input side member having a friction material on the outer peripheral portion;
An output side member having an engaging portion engageable with the transmission side shaft;
A damper mechanism for elastically connecting the input side member and the output side member in a circumferential direction;
A transmission torque limiter for holding the friction material of the input side member between the friction connecting surfaces of the drive member and limiting the torque transmitted from the drive member to the transmission side shaft;
A flow path formed in the drive member and the transmission torque limiting portion, for discharging foreign matter accumulated on the outer peripheral portion of the transmission torque limiting portion to the outside of the transmission torque limiting portion;
With
The drive member has a plurality of recesses formed side by side in the circumferential direction and recessed outward in the radial direction,
The transmission torque limiter is
A pressure ring having a plurality of engaging portions that are disposed opposite to the friction coupling surface across the friction material of the input side member and engage with a plurality of concave portions of the drive member on an outer peripheral portion;
A cone spring having an outer diameter smaller than the maximum inner diameter of the recess of the drive member, and pressing the pressure ring against the friction coupling surface;
A plurality of plate members arranged side by side in the circumferential direction and fixed to the drive member, and a support member that supports the cone spring;
Have
The support member has an open portion so that a part of a gap formed between the outer periphery of the cone spring and the recess is exposed to the outside.
The flow path includes a gap formed between an outer periphery of the cone spring and the recess, and an open portion of the support member.
Torque limiter device.

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