JPH0610631U - Torque limiter - Google Patents

Abstract

(57) [Summary] [Purpose] In the torque limiter, reduce the axial dimension and prevent seizure between friction surfaces. [Structure] This torque limiter has a first axially oriented first limiter.
The first block 12 having the friction surface 12e and the second friction surface 16c that faces the first friction surface 12e with a predetermined gap t.
And a second block 16 having. Second block 1
6, a disc-shaped hydraulic slit 16e for pushing the second friction surface 16c in the axial direction and pressing it against the first friction surface 12e when the pressure oil is supplied and expanded in the axial direction, and the hydraulic slit 16e. Hydraulic passage 1 for supplying pressure oil for axial expansion
6 g and a plug member 18 for closing the hydraulic passage 16 g are provided. When the relative position around the axis between the first block 12 and the second block 16 changes in the first block 12,
An opening member 19 for opening the stopper member 18 was attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a torque limiter that can reduce axial dimensions and prevent seizure between friction surfaces.

[0002]

[Prior art]

 Conventionally, as a torque limiter, as shown in FIG. 3, an inner peripheral surface of a cylindrical member 2 is fitted on an outer peripheral surface of a shaft member 1, and pressure oil is supplied to a hydraulic slit 2a of the cylindrical member 2 to supply the shear tube 3 thereto. On the other hand, there is a shaft member 1 which is fixed by an engaging member 4 capable of engaging the end portion of the shear tube 3 (see Japanese Patent Publication No. 63-30527).

The pressure oil in the hydraulic slit 2 a reduces the diameter of the inner peripheral surface of the tubular member 2 and presses it against the outer peripheral surface of the shaft member 1. As a result, the shaft member 1 and the tubular member 2 are frictionally coupled, and torque is transmitted between the shaft member 1 and the tubular member 2. Then, when a load of a predetermined value or more is applied to the shaft member 1 and the tubular member 2 and the inner peripheral surface of the tubular member 2 slips, the relative position around the axis of the shaft member 1 and the tubular member 2 changes, The end of the shear tube 3 is cut by the engaging member 4, and the oil in the hydraulic slit 2a is discharged to the outside. As a result, the frictional coupling between the shaft member 1 and the tubular member 2 is released, and torque is no longer transmitted between the shaft member 1 and the tubular member 2.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional torque limiter, since the area of the friction surface is limited by the shaft diameter and the shaft length, the torque capacity per given size is relatively small, and in particular, the axial dimension can be shortened. There is a problem that it is difficult.

Therefore, an object of the present invention is to provide a torque limiter capable of reducing the axial dimension.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a device according to claim 1 is characterized in that a first member having a first friction surface facing in the axial direction and a second member facing the first friction surface with a predetermined gap therebetween. A second member having a friction surface, and when pressure oil is supplied to the second member and expanded in the axial direction, the second friction surface is extruded in the axial direction to become the first friction surface. A disc-shaped hydraulic slit for press contact, a hydraulic passage for supplying pressure oil for axially expanding the hydraulic slit, and a plug member for closing the hydraulic passage are provided, and the first member is the first member. And an opening member for opening the plug member when the relative position around the axis between the second member and the second member changes.

The invention according to claim 2 is a shaft member having an outer peripheral surface with a spline, a tubular member that is fitted to the shaft member at a predetermined distance from the outer peripheral surface of the shaft member, Between a plurality of shaft side friction plates having a first friction surface oriented in the axial direction, which is guided by the spline of the shaft member so as to be movable in the axial direction, and between the shaft side friction plates fixed to the inner peripheral surface of the tubular member. And a cylinder-side friction member having a cylinder-side friction convex portion having a second friction surface that faces the first friction surface with a predetermined gap therebetween, and the cylinder-side friction member includes: When the pressure oil is supplied and expanded in the axial direction, the second friction surface of each of the cylindrical friction projections is pushed out in the axial direction so as to be pushed inside the cylindrical friction projections of the axial friction plate. A disk-shaped hydraulic slit to be pressed against the first rubbing surface and the above-mentioned hydraulic slit are enlarged in the axial direction. Has a hydraulic passage for supplying pressure oil and a plug member for closing the hydraulic passage, and the shaft member has an upper position when the relative position around the shaft between the shaft member and the tubular member changes. It is characterized in that it has an opening member for opening the stopper member.

Further, in the invention according to claim 3, a tubular member having a spline on an inner peripheral surface thereof, and a shaft member fitted to the tubular member at a predetermined distance from the inner peripheral surface of the tubular member. , A plurality of cylinder side friction plates having axially oriented first friction surfaces guided by the spline of the cylinder member and fixed to the outer peripheral surface of the shaft member, A shaft side friction member having a shaft side friction convex portion having a second friction surface which is alternately interposed between the plates and faces the first friction surface with a predetermined gap therebetween, and the shaft side friction member. Are provided inside the shaft-side friction projections, and when the pressure oil is supplied and expanded in the axial direction, the second friction surfaces of the shaft-side friction projections are pushed out in the axial direction, and the cylinder-side friction is A disk-shaped hydraulic slit that presses against the first friction surface of the plate and the hydraulic slit is enlarged in the axial direction. A hydraulic passage for supplying pressurized oil and a plug member for closing the hydraulic passage, and the tubular member is configured such that when the relative position around the shaft between the shaft member and the tubular member changes, It is characterized by having an opening member for opening the plug member.

[0009]

[Action]

 According to the torque limiter of the invention of claim 1, pressure oil is supplied to the hydraulic passage of the second member, the hydraulic slit is expanded in the axial direction, and the second friction surface is pushed in the axial direction. (2) After the friction surface is brought into pressure contact with the first friction surface of the first member, the hydraulic passage is closed with the plug member. Then, when a load of a predetermined value or more is applied to the first member and the second member during use, and the relative position around the axis between the first member and the second member changes, the above-mentioned opening member is used. The stopper member is opened. As a result, the pressure oil in the hydraulic passage and the hydraulic slit is discharged, and the second friction surface does not come into pressure contact with the first friction surface and is separated from the first friction surface. Then, the frictional connection between the first member and the second member is released, and the torque is not transmitted between the first member and the second member.

As described above, according to the first aspect of the present invention, the first member and the second member are coupled by the frictional coupling between the frictional surfaces extending in the axial direction and extending in the radial direction. Therefore, according to the above-mentioned invention, it is not necessary to lengthen the axial dimension even if the torque capacity is increased by increasing the area of the friction surface.

Therefore, the axial dimension can be shortened, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, when the pressure oil is drained from the hydraulic passage and the hydraulic slit, and at the same time, the friction surface separates from the friction surface facing each other, the first member and the second member may rotate at high speed. However, seizure between the friction surfaces can be prevented.

According to the torque limiter of the second aspect, the pressure oil is supplied to the hydraulic passage of the cylinder side friction member to expand the hydraulic slits in the cylinder side friction projections in the axial direction, and the cylinder side. The second friction surface of the friction projection is pushed out, and the second friction surface is brought into pressure contact with the first friction surface of each shaft side friction plate guided by the spline of the shaft member, and then the hydraulic passage is plugged. Close with a member. When the shaft member and the tubular member are loaded with a load greater than a predetermined value during use and the relative position around the axis between the shaft member and the tubular member changes, the stopper member is opened by the opening member. It As a result, the pressure oil is discharged from the hydraulic passage and the hydraulic slit. Then, the second friction surface of each of the cylinder-side friction projections does not come into pressure contact with the first friction surface of each of the shaft-side friction plates, and the second friction surface is separated from the first friction surface of each of the shaft-side friction plates. Then, the frictional connection between the shaft member and the tubular member is released, and torque is not transmitted between the tubular member and the axial member.

According to the torque limiter of the third aspect, the pressure oil is supplied to the hydraulic passage of the shaft-side friction member to expand the hydraulic slits in the shaft-side friction protrusions in the axial direction, and the shaft-side friction member is expanded. The second friction surface of the friction projection is pushed out, and the second friction surface is brought into pressure contact with the first friction surface of each cylinder side friction plate guided by the spline of the cylinder member, and then the hydraulic passage is plugged. Close with a member. When the shaft member and the tubular member are loaded with a load greater than a predetermined value during use and the relative position around the axis between the shaft member and the tubular member changes, the stopper member is opened by the opening member. It As a result, the pressure oil is discharged from the hydraulic passage and the hydraulic slit. Then, the second friction surface of each of the shaft-side friction projections does not come into pressure contact with the first friction surface of each of the cylinder-side friction plates, and the second friction surface is separated from the first friction surface of each of the cylinder-side friction plates.

Then, the frictional connection between the shaft member and the tubular member is released, and torque is not transmitted between the tubular member and the axial member.

As described above, according to the third aspect of the invention, the shaft member and the tubular member are coupled by the frictional coupling between the friction surfaces that face in the axial direction and extend in the radial direction. Therefore, according to the above consideration, even if the torque capacity is increased by increasing the area of the friction surface, it is not necessary to lengthen the axial dimension.

Therefore, the axial dimension can be shortened, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, at the same time when the pressure oil is drained from the hydraulic passage and the hydraulic slit, the friction surface separates from the friction surface facing each other, so that even when the tubular member and the shaft member rotate at high speed, The seizure between the friction surfaces is prevented.

[0019]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

FIG. 1 shows a first embodiment which is an embodiment of the torque limiter described in claim 1. The torque limiter includes a first block 12 and a second block 16. The first shaft member 10 and the second shaft member 11 are connected to both sides of the torque limiter in the axial direction. Flange portions 10a and 11a facing each other are provided at the ends of the shaft members 10 and 11, respectively.

The first block 12 has a large diameter portion 12a having the same diameter as the flange portion 10a, and an intermediate diameter portion 12b and a small diameter portion 12c axially continuous from the large diameter portion 12a. The above-mentioned first block 12 is fixed to the flange portion 10 a of the first shaft member 10 with bolts 13. A first friction plate 14 is fixed to the small diameter portion 12c with bolts 15, and the first friction plate 14 forms a concave step portion 12d in the middle diameter portion 12b of the first block 12.

The first friction plate 14 has a first friction surface 14a facing the recessed step portion 12d in the axial direction. Further, the large diameter portion 12a has a first friction surface 12e which is oriented in the axial direction on the concave step portion 12d side.

The second block 16 is connected to the connection portion 16 a connected to the flange portion 11 a and the connection portion 16 a from the connection portion 16 a to the first member 10 side, and is connected to the concave step portion 12 d of the first shaft member 10. And a fitting portion 16b which is fitted in the direction with a predetermined gap t therebetween. The connecting portion 16a of the second block 16 is fixed to the flange portion 11a with a bolt 17.

The fitting portion 16b has a second friction surface 16c that faces the first friction surface 12e and a second friction surface 16d that faces the first friction surface 14a.

Inside the fitting portion 16b of the second block 16, disc-shaped hydraulic slits 16e, 16e are provided along the second friction surfaces 16c, 16d. The two hydraulic slits 16e, 16e are connected in series by an axial hole 16f. Note that only one of the hydraulic slits 16e, 16e may be provided.

A hydraulic passage 16g is provided in the hydraulic slit 16e on the second friction surface 16c side of the fitting portion 16b, and an inlet of the hydraulic passage 16g on the outer peripheral surface side of the fitting portion 16b is closed by a plug member 18. It

An opening member 19 is attached to the outer peripheral surface of the first block 12. The opening member 19 has a relative position around the axis between the first block 12 and the second block 16 when the positions around the axes of the first shaft member 10 and the second shaft member 11 are changed. Is changed, the plug member 18 of the second block 16 is cut and the plug member 18 is opened.

According to the configuration of the first embodiment described above, when pressure oil is supplied from the hydraulic passage 16g of the second block 16 fixed to the second shaft member 11 to the hydraulic slits 16e, 16e, the hydraulic slits 16e are rotated. Expanded in the direction. Then, the second friction surface 16c of the fitting portion 16b of the second block 16 is pushed to the left in the axial direction and comes into pressure contact with the first friction surface 12e of the first block 12 described above. At the same time, the second friction surface 16d of the fitting portion 16b is pushed rightward in the axial direction and is brought into pressure contact with the first friction surface 14a of the first friction plate 14.

In this way, the first block 12 and the second block 16 are frictionally coupled, and the first shaft member 10 and the second shaft member 11 are frictionally coupled. Then, when the second friction surfaces 16c and 16d are pushed to a predetermined position and the initial setting of the torque by the pressure contact between the second friction surfaces 16c and 16d and the first friction surfaces 12e and 14a is completed, the hydraulic passage 16g is closed. It is closed with the stopper member 18.

When the first shaft member 10 or the second shaft member 11 is loaded with a load equal to or more than a predetermined value during use, the first shaft member 10 or the second shaft member 11 is started to be used in this state. When the relative position around the axis changes, the relative position around the axis between the first block 12 and the second block 16 changes, and the opening member 19 opens the plug member 18. Then, the pressure oil is discharged from the hydraulic slits 16e, 16e and the hydraulic passage 16g, the second friction surfaces 16c, 16d do not come into pressure contact with the first friction surfaces 12e, 14a, and the second friction surfaces 16c, 16d become the first friction surfaces. It is separated from the first friction surfaces 12e and 14a. Then, the frictional coupling between the first shaft member 10 and the second shaft member 11 is released, and torque is not transmitted between the first shaft member 10 and the second shaft member 11.

In the above structure, both the first friction surfaces 12e and 14a of the first block 12 and the first friction plate 14 and the second friction surfaces 16c and 16d of the second block 16 are oriented in the axial direction. Since the friction surface extends in the radial direction, it is not necessary to lengthen the axial dimension even if the area of the friction surface is increased to increase the torque capacity.

Therefore, according to the above-described embodiment, it is possible to reduce the axial dimension, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, at the same time when the pressure oil is drained from the hydraulic slits 16e, 16e and the hydraulic passage 16g, the second friction surfaces 16c, 16d are separated from the first friction surfaces 12e, 14a, so that the first and second shaft members 10 Even if 11 and 11 rotate at high speed, seizure between the friction surfaces can be prevented.

FIG. 2 shows a torque limiter of a second embodiment, which is an embodiment of the invention according to claim 2.

The torque limiter includes a shaft member 30 and a tubular member 31. The shaft member 30 is provided with a flange portion 30a, and an axial spline 30b is formed on the outer peripheral surface of the shaft member 30. The tubular member 31 is provided with a flange portion 31a, and the inner peripheral surface of the tubular member 31 is formed with an axial spline 31b.

A plurality of (four in FIG. 2) shaft-side friction plates 32, 32 having projections 32a that fit in the recesses of the splines 30b of the shaft member 30 are the cylindrical member 31 and the shaft member 30. It is provided between and. The shaft side friction plates 32 are guided by the splines 30b of the shaft member 30 so as to be movable in the axial direction. The shaft side friction plate 32 has, on both sides thereof, first friction surfaces 32b, 32b oriented in the axial direction.

A sleeve-shaped tubular friction member 33 is fitted on the inner peripheral surface of the tubular member 31. The cylinder side friction member 33 has a convex portion 33a on the outer peripheral surface that fits into the concave portion of the spline 31b of the cylinder member 31, and alternates with a predetermined gap t between the shaft side friction plates 32. , 33b, which are provided on the cylinder side.

The flange portions 33c, 33c on both sides of the cylinder side friction member 33 are fixed to the outer end surface of the cylinder member 31 with bolts 34, 34. The cylinder-side friction convex portion 33b has axially oriented second friction surfaces 33d, 33d on both sides.

Disc-shaped hydraulic slits 33e, ..., 33e are provided inside the cylinder-side friction projections 33b, ..., 33b of the cylinder-side friction member 33. The hydraulic slits 33e are connected in series by an axial hydraulic passage 33f provided in the convex portion 33a.

The hydraulic passage 33 f has an inlet on the side of the flange portion 30 a of the shaft member 30, and the inlet is closed by the stopper member 18.

An opening member 19 is attached to the shaft member 30 axially inside the flange portion 30a. The opening member 19 disconnects the plug member 18 attached to the inlet of the hydraulic passage 33f of the cylinder side friction member 33 when the relative position around the axis between the shaft member 30 and the cylinder member 31 changes. Then, the plug member 18 is opened.

The cylinder-side friction member 33 is cut into a predetermined number (five in FIG. 2) so as to be divided in the axial direction and machined, and then cut between each cut surface and the hydraulic passage 33f. It may be assembled by fitting the O-ring 35.

According to the configuration of the second embodiment described above, when pressure oil is supplied to the hydraulic slits 33e from the hydraulic passages 33f of the tubular friction member 33 fitted in the tubular member 31, the hydraulic slits 33e are axially moved. The second frictional surfaces 33d, 33d of the cylinder side frictional projection 33b are extruded in both axial directions by being expanded in the direction. Then, the second friction surfaces 33d, 33d are brought into pressure contact with the first friction surfaces 32b, 32b on both sides of the shaft side friction plate 32. In this way, the shaft member 30 and the tubular member 31 are frictionally coupled.

Then, the second friction surfaces 33d, 33d are pushed to a predetermined position, and the torque is initially set by the pressure contact between the second friction surfaces 33d, 33d and the first friction surfaces 32b, 32b, and the hydraulic passage 33f is closed with the stopper member 18.

When the shaft member 30 and the tubular member 31 are used in this state and a load of a predetermined value or more is applied during use, the relative position around the axis changes between the shaft member 30 and the tubular member 31. Then, the opening member 19 opens the plug member 18, and the pressure oil is drained from the hydraulic slit 33e and the hydraulic passage 33f. Then, the second friction surfaces 33d, 33d no longer press-contact the respective first friction surfaces 32b, 32b, the second friction surfaces 33d, 33d are separated from the first friction surfaces 32b, 32b, and the shaft member 30 and The frictional connection with the tubular member 31 is released, and torque is not transmitted between the shaft member 30 and the tubular member 31.

In the above configuration, the first friction surfaces 32 b and 32 b of the shaft side friction plate 32 fitted to the shaft member 30 and the cylinder side friction projection of the cylinder side friction member 33 fitted to the cylinder member 31. The second frictional surfaces 33d and 33d of 33b are frictional surfaces that are oriented in the axial direction and extend in the radial direction. Therefore, even if the area of the frictional surface is increased and the torque capacity is increased, the axial dimension is reduced. It doesn't have to be long.

Therefore, according to the above-described embodiment, it is possible to reduce the axial dimension, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, since the second friction surface 33d separates from the first friction surface 32b at the same time as the pressure oil is drained from the hydraulic slit 33e and the hydraulic passage 33f, the shaft member 30 and the tubular member 31 rotate at high speed. Even in this case, seizure between the friction surfaces can be prevented.

FIG. 3 shows a torque limiter of a third embodiment, which is an embodiment of the invention according to claim 3.

This torque limiter includes a tubular member 40 having a spline 40b on its inner peripheral surface, and a shaft member 41 fitted to the tubular member 40 at a predetermined distance from the inner peripheral surface of the above tubular member 40. Fixed to the outer peripheral surface of the shaft member 41, and a plurality of cylinder side friction plates 42 having a first friction surface 42b oriented in the axial direction, which is guided by the spline 40b of the cylinder member so as to be movable in the axial direction. And a shaft side having a shaft side friction convex portion 43b having a second friction surface 43d which is alternately interposed between the cylinder side friction plates 42 and faces the first friction surface 42b with a predetermined gap. And a friction member 43.

The shaft-side friction member 43 is provided inside the shaft-side friction protrusion 43b, and when the pressure oil is supplied to expand the shaft-side friction protrusion 43b in the axial direction, the shaft-side friction protrusion 43b has a second portion. A disc-shaped hydraulic slit 43e that pushes the friction surface 43d in the axial direction to press against the first friction surface 42b of the cylinder side friction plate 42, and pressure oil that expands the hydraulic slit 43e in the axial direction are supplied. It has a hydraulic passage 43f and a plug member 48 for closing the hydraulic passage.

Further, the tubular member 40 has an opening member 49 for opening the plug member 48 when the relative position around the axis between the shaft member 41 and the tubular member 40 changes.

[0053]

[Effect of device]

 As is clear from the above description, the torque limiter according to claim 1 of the present invention supplies the pressure oil to the hydraulic passage of the second member to expand the hydraulic slit in the axial direction, and thereby the second slit of the second member. The two friction surfaces are extruded in the axial direction, the second friction surface is brought into pressure contact with the first friction surface of the first member, and then the hydraulic passage is closed by the plug member. On the other hand, when the relative position around the axis between the first member and the second member changes during use, the opening member opens the plug member, and the pressure oil is discharged from the hydraulic passage. The surface no longer presses against the first friction surface, the frictional connection between the first member and the second member is released, and torque is not transmitted.

As described above, according to the first aspect of the invention, the first member and the second member are coupled by the frictional coupling between the friction surfaces that face in the axial direction and extend in the radial direction. Therefore, according to the above-mentioned invention, it is not necessary to lengthen the axial dimension even if the torque capacity is increased by increasing the area of the friction surface.

Therefore, the axial dimension can be shortened, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, at the same time as the pressure oil is drained from the hydraulic passage and the hydraulic slit, the friction surface separates from the friction surface facing each other, so that the first member and the second member are rotating at high speed. However, seizure between the friction surfaces can be prevented.

Further, in the torque limiter of the second aspect, the pressure oil is supplied to the hydraulic passage of the cylinder side friction member to expand the hydraulic slit of the cylinder side friction convex portion in the axial direction, and the cylinder side friction convex portion is expanded. After the second friction surface is pushed in the axial direction and the second friction surface is brought into pressure contact with the first friction surface of the shaft side friction plate fitted to the shaft member, the hydraulic passage is closed by the plug member. On the other hand, when the relative position around the axis between the shaft member and the tubular member changes during use, the opening member opens the plug member and the pressure oil is discharged from the hydraulic passage. The first friction surface no longer comes into pressure contact with the second friction surface, the frictional connection between the shaft member and the cylindrical member is released, and torque is not transmitted.

As described above, according to the second aspect of the invention, the shaft member and the tubular member are coupled by the frictional coupling between the frictional surfaces extending in the axial direction and extending in the radial direction. Therefore, according to the above consideration, even if the torque capacity is increased by increasing the area of the friction surface, it is not necessary to lengthen the axial dimension.

Therefore, the axial dimension can be shortened, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, at the same time when the pressure oil is drained from the hydraulic passage and the hydraulic slit, the friction surface separates from the friction surface facing each other, so that even when the tubular member and the shaft member rotate at high speed, It is possible to prevent seizure between the friction surfaces.

Further, in the torque limiter of the third aspect, the pressure oil is supplied to the hydraulic passage of the shaft side friction member to expand the hydraulic slit of the shaft side friction convex portion in the axial direction, and the shaft side friction convex portion is expanded. After the second friction surface is pushed in the axial direction and the second friction surface is brought into pressure contact with the first friction surface of the cylinder side friction plate fitted in the cylinder member, the hydraulic passage is closed by the plug member. On the other hand, when the relative position around the axis between the shaft member and the tubular member changes during use, the opening member opens the plug member and the pressure oil is discharged from the hydraulic passage. The first friction surface no longer comes into pressure contact with the second friction surface, the frictional connection between the shaft member and the cylindrical member is released, and torque is not transmitted.

As described above, according to the third aspect of the invention, the shaft member and the tubular member are coupled by the frictional coupling between the friction surfaces that face in the axial direction and extend in the radial direction. Therefore, according to the above consideration, even if the torque capacity is increased by increasing the area of the friction surface, it is not necessary to lengthen the axial dimension.

Therefore, the axial dimension can be shortened, and if the torque capacity is the same, the axial dimension can be shortened as compared with the conventional torque limiter.

Further, at the same time as the pressure oil is drained from the hydraulic passage and the hydraulic slit, the friction surface separates from the friction surface facing each other, so that even when the tubular member and the shaft member rotate at high speed, It is possible to prevent seizure between the friction surfaces.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment of a torque limiter of the present invention.

FIG. 2 is a side sectional view and a sectional view taken along line AA of a second embodiment of the torque limiter of the present invention.

FIG. 3 is a side sectional view of a torque limiter according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a conventional torque limiter.

[Explanation of symbols]

10 ... 1st shaft member, 11 ... 2nd shaft member, 12 ... 1st block, 12e ... 1st friction surface, 14 ... 1st friction plate, 14a
... first friction surface, 16 ... second block, 16c, 16d ...
2nd frictional surface, 16e ... hydraulic slit, 16g ... hydraulic passage, 18 ... plug member, 19 ... opening member, 30 ... shaft member, 3
0b ... Spline, 31 ... Cylindrical member, 32 ... Shaft side friction plate,
32b ... 1st friction surface, 33 ... Cylinder side friction member, 33b ... Cylinder side friction convex part, 33d ... 2nd friction surface, 33e ... Hydraulic slit, 33f ... Hydraulic passage.

Claims (3)

[Scope of utility model registration request] 1. A first having a first friction surface oriented in the axial direction.
A member and a second member having a second friction surface facing the first friction surface with a predetermined gap therebetween, and when pressure oil is supplied to the second member and expanded in the axial direction, , Above second
A disk-shaped hydraulic slit that pushes the friction surface in the axial direction to press against the first friction surface, a hydraulic passage that supplies pressure oil that expands the hydraulic slit in the axial direction, and a plug member that closes the hydraulic passage. And an opening member for opening the plug member when the relative position around the axis between the first member and the second member changes is attached to the first member. limiter. 2. A shaft member having a spline on its outer peripheral surface,
A tubular member that fits with the shaft member is provided at a predetermined distance from the outer peripheral surface of the shaft member, and a first friction surface that is axially movably guided by a spline of the shaft member and is oriented in the axial direction. A plurality of shaft side friction plates and a second friction member fixed to the inner peripheral surface of the cylindrical member and alternately interposed between the shaft side friction plates and facing the first friction surface with a predetermined gap. And a cylinder-side friction member having a cylinder-side friction projection having a surface, wherein the cylinder-side friction member is provided inside the cylinder-side friction projection, and when pressure oil is supplied and expanded in the axial direction. A disk-shaped hydraulic slit that pushes out the second friction surface of each cylinder-side friction convex portion in the axial direction and press-contacts the first friction surface of the shaft-side friction plate, and a pressure that expands the hydraulic slit in the axial direction. A hydraulic passage for supplying oil, and a plug member for closing the hydraulic passage. A torque limiter comprising an opening member that opens the plug member when the relative position around the axis between the shaft member and the tubular member changes. 3. A tubular member having a spline on its inner peripheral surface,
A shaft member fitted to the tubular member at a predetermined distance from the inner peripheral surface of the tubular member, and a first friction surface axially movably guided by a spline of the tubular member so as to be movable in the axial direction. A plurality of cylinder-side friction plates each having a second friction member fixed to the outer peripheral surface of the shaft member and alternately interposed between the cylinder-side friction plates and facing the first friction surface with a predetermined gap. And a shaft-side friction member having a shaft-side friction protrusion having a surface, wherein the shaft-side friction member is provided inside the shaft-side friction protrusion and when pressure oil is supplied and expanded in the axial direction. A disk-shaped hydraulic slit for axially pushing out the second friction surface of each shaft-side friction convex portion to make pressure contact with the first friction surface of the cylinder-side friction plate, and a pressure for expanding the hydraulic slit in the axial direction. A hydraulic passage for supplying oil, and a plug member for closing the hydraulic passage. A torque limiter comprising an opening member that opens the plug member when the relative position around the axis between the shaft member and the tubular member changes.