JP2013257035A - Torque limiter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque limiter capable of enclosing a fluid in a fluid pressure expansion chamber even if the outer peripheral surface of a female coupler of a fluid pressure coupler is pressed against the fluid enclosing passage side of the inner peripheral surface of a coupler socket.SOLUTION: A cylindrical member 3 of a torque limiter 1 includes a hydraulic pressure expansion chamber 33 filled with oil by a hydraulic pressure coupler 10, a coupler socket 35 to which the hydraulic pressure coupler 10 is connected, and an oil enclosing passage 36 allowing the inner peripheral surface of the coupler socket 35 to communicate with the hydraulic pressure expansion chamber 33. A female coupler 11 of the hydraulic pressure coupler 10 includes an inside connection part 13 and an outside connection part 14. An annular gap S1 for guiding oil to the oil enclosing passage 36 is formed between both connection parts 13, 14. A groove (communication structure) 13e allowing the gap S1 to communicate with the oil enclosing passage 36 is formed on the outer periphery of the inside connection part 13 extendedly in the circumferential direction while the outer peripheral surface 13d thereof is pressed against the opening edge 36a of the oil enclosing passage 36 on the inner peripheral surface of the coupler socket 35.

Description

  The present invention relates to a torque limiter.

  Conventionally, as a torque limiter, for example, the one disclosed in Patent Document 1 is known. The torque limiter of Patent Document 1 includes a shaft member and a cylindrical member that is externally fitted to the shaft member, and the cylindrical member has an annular hydraulic expansion chamber. The hydraulic expansion chamber is expanded in the radial direction by the oil sealed therein, and the inner peripheral surface of the cylindrical member is reduced in diameter. Thereby, when the inner peripheral surface of the cylindrical member presses the outer peripheral surface of the shaft member, the cylindrical member and the shaft member are frictionally coupled, and torque is transmitted between the cylindrical member and the shaft member. Further, by releasing the frictional engagement between the tubular member and the shaft member, the transmission of torque between the tubular member and the shaft member is released.

  As shown in FIG. 7, the torque limiter includes a hydraulic coupler 100 for enclosing oil in a hydraulic expansion chamber (not shown) of the cylindrical member 200. The hydraulic coupler 100 includes a male coupler 110 having an oil supply passage 111 and a female coupler 120 having an inner connecting portion 121 and an outer connecting portion 122. The female coupler 120 is attached to the coupler receiving part 201 of the cylindrical member 200, and the male coupler 110 is inserted into the female coupler 120.

  The coupler receiving part 201 has a bottomed hole 202 and an oil-filled passage 203 that opens to the inner peripheral surface of the hole 202. The oil sealing passage 203 is open to the hydraulic expansion chamber (not shown), and oil discharged from the hydraulic pump (not shown) is the oil supply passage 111 of the male coupler 110 and the outer connection portion of the female coupler 120. The gap between the inner connection portion 121 and the inner connection portion 121, the gap between the outer peripheral surface of the inner connection portion 121 and the inner peripheral surface of the hole 202, and the oil-filled passage 203 so as to be sealed. It has become.

JP 2010-101386 A

In the hydraulic coupler 100, the inner connection portion 121 of the female coupler 120 is connected to the oil-filled passage at the tip of the male coupler 110 due to the weight of a hydraulic hose (not shown) that connects the hydraulic pump and the male coupler 110. There are cases where an external force acts in the direction of pressing toward the 203 side. In this case, the outer peripheral surface of the inner connection portion 121 is pressed against the opening edge of the oil sealing passage 203 on the inner peripheral surface of the coupler receiving portion 201, so that the inner connection portion 121 and the hole 202 are near the opening edge. There is a problem that the gap is eliminated, and this makes it impossible to guide the oil into the oil sealing passage 203.
The present invention has been made in view of such circumstances, and even if the outer peripheral surface of the female coupler in the fluid pressure coupler is pressed against the fluid sealing passage side of the inner peripheral surface of the coupler receiving portion, the fluid pressure expansion chamber is provided. It is an object of the present invention to provide a torque limiter capable of enclosing a fluid in a cylinder.

  The torque limiter of the present invention includes a shaft member, a fluid pressure expansion chamber formed inside, a concave coupler receiving portion that opens to the outer peripheral side, an inner peripheral surface of the coupler receiving portion, and the fluid pressure expansion chamber. And a fluid pressure passage for sealing fluid in the fluid pressure expansion chamber connected to a coupler receiving portion of the cylinder member. A coupler that expands the fluid pressure expansion chamber in a radial direction by a fluid sealed in the chamber, and frictionally connects the cylindrical member and the shaft member to transmit torque between the two members. A torque limiter for releasing transmission of the torque by releasing the frictional engagement, wherein the fluid pressure coupler includes a cylindrical inner connecting portion disposed on a bottom side of the coupler receiving portion, and A cylindrical outer connection disposed on the opening side of the coupler receiving portion And a female coupler in which an annular gap for guiding a fluid to the fluid sealing passage is formed between both the connecting portions, and a male coupler having a tip portion inserted into the female coupler, A communication structure for connecting the gap and the fluid sealing passage to the outer periphery of the inner connecting portion in a state where the outer peripheral surface is pressed against the opening edge side of the fluid sealing passage on the inner peripheral surface of the coupler receiving portion. Is formed.

  According to the torque limiter configured as described above, even if the outer peripheral surface of the inner connection portion of the female coupler is pressed against the opening edge side of the fluid sealing passage on the inner peripheral surface of the coupler receiving portion, The fluid flowing through the gap between the connection portion and the outer connection portion is guided to the fluid sealing passage by the communication structure. Thereby, even if the outer peripheral surface of the female coupler is pressed against the fluid sealing passage, the fluid can be guided to the fluid sealing passage, so that the fluid can be sealed in the fluid pressure expansion chamber.

  The communication structure preferably includes a groove formed to extend in a circumferential direction of the outer periphery of the inner connection portion. In this case, even if the outer peripheral surface of the inner connecting portion of the female coupler is pressed against the opening edge side of the fluid sealing passage on the inner peripheral surface of the coupler receiving portion, the gap between the inner connecting portion and the outer connecting portion is reduced. The fluid flowing through the gap is guided to the fluid sealing passage by flowing through the outer peripheral surface of the inner connecting portion to the groove portion. Thereby, even if the outer peripheral surface of the female coupler is pressed against the opening edge side, the fluid can be guided to the fluid sealing passage.

  It is preferable that the groove is formed over the entire outer periphery of the inner connection portion. In this case, when the inner connection portion is arranged in the coupler receiving portion, it is not necessary to align the groove portion in the circumferential direction so as to face the opening edge of the fluid sealing passage. Can be done.

  It is preferable that the groove is formed at a predetermined interval on the bottom side with respect to the opening-side end surface of the inner connection portion. In this case, it is possible to prevent the area of the end surface on the opening side of the inner connection portion from being reduced due to the formation of the groove portion in the inner connection portion. Thereby, since it can prevent that a contact surface pressure with the end surface of the bottom side of an outer side connection part becomes high in the end surface of the opening side of an inner side connection part, it can prevent effectively that an inner side connection part is damaged. .

The communication structure may be a protrusion formed on the bottom side of the opening edge of the fluid sealing passage so as to protrude from the outer peripheral surface of the inner connection portion to the inner peripheral surface side of the coupler receiving portion. Good.
In this case, when the outer peripheral surface of the inner connection portion of the female coupler is pressed against the opening edge side of the fluid sealing passage on the inner peripheral surface of the coupler receiving portion, the protruding portion is the coupler receiving portion before the outer peripheral surface. It abuts on the inner peripheral surface of. At this time, since the projecting portion comes into contact with the bottom side of the opening edge, the fluid sealing passage can be prevented from being blocked by the inner connecting portion. Thereby, even if the outer peripheral surface of the female coupler is pressed against the fluid sealing passage, the fluid flowing through the gap between the inner connecting portion and the outer connecting portion can be guided to the fluid sealing passage.

  It is preferable that the protrusion is formed over the entire outer periphery of the inner connection portion. In this case, when the inner connecting portion is disposed in the coupler receiving portion, it is not necessary to align the protrusion in the circumferential direction so as to be disposed on the opening edge side of the fluid sealing passage. It can be done easily.

  According to the torque limiter of the present invention, even when the outer peripheral surface of the female coupler in the fluid pressure coupler is pressed against the fluid sealing passage side of the inner peripheral surface of the coupler receiving portion, the fluid can be sealed in the fluid pressure expansion chamber. .

It is a schematic sectional side view which shows the torque limiter which concerns on the 1st Embodiment of this invention. It is a sectional side view which shows the hydraulic coupler of the said torque limiter. It is a principal part expanded side sectional view of the said hydraulic coupler. FIG. 5 is a side sectional view showing a state where an outer peripheral surface of an inner connection portion of the hydraulic coupler is pressed against an oil sealing passage side of an inner peripheral surface of a coupler receiving portion. It is a side view which shows the said inner side connection part. It is a principal part expanded side sectional view which shows the hydraulic coupler of the torque limiter which concerns on the 2nd Embodiment of this invention. It is a sectional side view which shows the conventional torque limiter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional side view showing a torque limiter according to a first embodiment of the present invention. The torque limiter 1 is disposed between the shaft member 2, the tubular member 3 fitted on the shaft member 2, the shear valve 4 attached to the tubular member 3, and the shaft member 2 and the tubular member 3. The first rolling bearing 5 and the second rolling bearing 6 are provided, and a hydraulic coupler (fluid pressure coupler) 10 (see FIG. 2) for sealing oil in a hydraulic expansion chamber 33 to be described later.

  In FIG. 1, the shaft member 2 includes a shaft main body portion 21 formed in a columnar shape, and a locking portion 22 having a substantially L-shaped cross section that is externally fitted to the shaft main body portion 21. On the outer periphery of the shaft main body 21, a spiral groove 21b for preventing oil sealing formed in a spiral shape in the circumferential direction is formed. The locking portion 22 includes a first cylindrical portion 22a fitted on the shaft body portion 21, an annular portion 22b extending radially outward from one axial end portion of the first cylindrical portion 22a, and a radial direction of the annular portion 22b. And a second cylindrical portion 22c extending in the axial direction from the outer end portion.

  The cylindrical member 3 includes a first cylindrical member 31 that is externally fitted to the shaft main body 21 and a second cylindrical member 32 that is externally fitted to the first cylindrical member 31. Between the inner peripheral surface 31a of the first cylinder member 31 and the outer peripheral surface 21a of the shaft main body 21, lubricant for preventing seizure is applied. One end portion in the axial direction of the second cylindrical member 32 is fitted in the second cylindrical portion 22c of the locking portion 22, and the end surface on the one end side in the axial direction is the axial direction of the annular portion 22b of the locking portion 22. It is arranged to face one side.

  The first rolling bearing 5 is formed of, for example, a ball bearing, and includes an inner ring 51 that is fitted and fixed to the shaft body 21, an outer ring 52 that is fitted and fixed to the first cylinder member 31, an outer periphery of the inner ring 51, and an outer ring 52. It has the ball | bowl 53 arrange | positioned between inner periphery. The second rolling bearing 6 is formed of, for example, a ball bearing, and includes an inner ring 61 that is fitted and fixed to the shaft body 21, an outer ring 62 that is fitted and fixed to the second cylindrical member 32, an outer periphery of the inner ring 61, and an outer ring 62. It has the ball | bowl 63 arrange | positioned between inner periphery. The first and second rolling bearings 5, 6 are configured to rotatably support the shaft member 2 with respect to the tubular member 3 when the shaft member 2 rotates relative to the tubular member 3.

  A hydraulic expansion chamber (fluid pressure expansion chamber) 33 that extends over substantially the entire axial length is formed on the inner peripheral surface side of the second cylindrical member 32, and oil is sealed in the hydraulic expansion chamber 33. It has come to be. In addition, the second cylinder member 32 is formed with a shear valve mounting hole 34 and a coupler receiving portion 35 that are open to the outer peripheral side, adjacent to each other. A plurality of shear valve mounting holes 34 and coupler receiving portions 35 are formed at predetermined intervals in the circumferential direction.

  The shear valve 4 is fitted in the shear valve mounting hole 34, and one end portion of the shear valve 4 protrudes radially outward from the outer peripheral surface of the second cylindrical member 32, and the second of the locking portion 22. Locked to the cylindrical portion 22c. The shear valve 4 has a tube 4a extending along its axis. One end of the tube 4 a is closed and protrudes radially outward from the outer peripheral surface of the second cylindrical member 32. The other end of the tube 4 a is open and communicates with one axial end of the hydraulic expansion chamber 33.

  The coupler receiving portion 35 is formed of a circular hole formed in a concave shape, and the hydraulic coupler 10 is connected thereto. The coupler receiving portion 35 has a screw hole portion 35a formed on the opening side and a small diameter hole portion 35b formed on the bottom side, and the hole diameter of the small diameter hole portion 35b is the hole of the screw hole portion 35a. The step portion 35c is formed between the screw hole portion 35a and the small diameter hole portion 35b.

  The second cylinder member 32 is formed with an oil filled passage (fluid filled passage) 36 that communicates the coupler receiving portion 35 and the shear valve mounting hole 34. One end of the oil sealing passage 36 opens to the inner peripheral surface of the small diameter hole portion 35 b in the coupler receiving portion 35. Further, the other end of the oil sealing passage 36 is opened on the inner peripheral surface of the shear valve mounting hole 34, and the opening communicates and blocks the shear valve mounting hole 34 by opening and closing the shear valve 4. Is done. Therefore, the inner peripheral surface of the coupler receiving portion 35 communicates with the hydraulic expansion chamber 33 through the oil sealing passage 36 and the shear valve mounting hole 34 by opening the shear valve 4.

  With the above configuration, oil is sealed from the hydraulic coupler 10 into the hydraulic expansion chamber 33 through the oil sealing passage 36 and the shear valve mounting hole 34, and the inside of the hydraulic expansion chamber 33 is pressurized, so that the hydraulic expansion chamber 33 has a diameter. Can be expanded in the direction. Thereby, the outer peripheral surface 21a of the shaft member 2 and the inner peripheral surface 31a of the tubular member 3 are frictionally coupled, and torque can be transmitted between the shaft member 2 and the tubular member 3. In this state, when oil is removed from the hydraulic expansion chamber 33, the frictional connection between the outer peripheral surface 21 a of the shaft member 2 and the inner peripheral surface 31 a of the cylindrical member 3 is released, and the shaft member 2 and the cylindrical member 3 are not connected. Torque transmission can be released.

  FIG. 2 is a side sectional view showing the hydraulic coupler 10. In FIG. 2, the hydraulic coupler 10 includes a female coupler 11 disposed in the coupler receiving portion 35 of the second cylindrical member 32, and a male coupler 12 having a tip portion inserted into the female coupler 11. . The distal end portion of the male coupler 12 is formed in a cylindrical shape, and an oil supply passage 12 a extending in the axial direction is formed inside the male coupler 12. One end of the oil supply passage 12a extends outward in the radial direction of the male coupler 12 and opens to the outer peripheral surface of the distal end portion of the male coupler 12. The other end of the oil supply passage 12a is hydraulically connected via a hydraulic hose (not shown). Connected to the pump.

  The female coupler 11 includes an inner connection portion 13, an outer connection portion 14, a first backup ring 15, a second backup ring 16, a washer 17, a first O ring 18, and a second O ring 19. The first backup ring 15, the washer 17 and the first O-ring 18 are all formed in an annular shape. The second backup ring 16 has the same shape as the first backup ring 15, and the second O-ring 19 has the same shape as the first O-ring 18.

  The inner connection portion 13 is formed in a bottomed cylindrical shape, and is disposed by being inserted into the small diameter hole portion 35b with the bottom portion facing the bottom side of the coupler receiving portion 35. In this state, the outer peripheral surface of the inner connection portion 13 is disposed to face the opening on the small diameter hole portion 35 b side of the oil sealing passage 36. A large-diameter portion 13a, a step portion 13b, and a small-diameter portion 13c are formed in this order from the opening side to the bottom side of the inner connection portion 13 in this order. The small diameter portion 13c is formed to have a smaller diameter than the large diameter portion 13a, and the distal end portion of the male coupler 12 passes through the large diameter portion 13a and is inserted to the small diameter portion 13c.

  Between the large-diameter portion 13a of the inner connection portion 13 and the outer peripheral surface of the distal end portion of the male coupler 12, the first backup ring 15, the first O-ring 18, and the washer 17 are provided from the bottom side toward the opening side. Some are arranged in this order. Specifically, a part of the first backup ring 15 and the washer 17 is press-fitted and fixed to the large-diameter portion 13 a of the inner connection portion 13, and the first backup ring 15 is a step portion of the inner connection portion 13. 13b. The first O-ring 18 is sandwiched between the first backup ring 15 and the washer 17.

  The outer connection portion 14 is formed in a cylindrical shape, and the outer diameter thereof is larger than the outer diameter of the inner connection portion 13. The outer connection portion 14 has a male screw portion 14d on the outer periphery thereof, and the male screw portion 14d is screwed into the screw hole portion 35a of the coupler receiving portion 35 so as to be disposed in the screw hole portion 35a. Yes. The end surface on the bottom side of the outer connection portion 14 is in contact with the step portion 35 c of the coupler receiving portion 35. In this state, the axis of the outer connecting portion 14 is substantially coincident with the axis of the inner connecting portion 13.

  A large diameter portion 14a, a stepped portion 14b, and a small diameter portion 14c are formed in this order from the bottom side of the coupler receiving portion 35 toward the opening side on the inner periphery of the outer connection portion 14. The small diameter portion 14 c is formed to have a smaller diameter than the large diameter portion 14 a and is formed to have substantially the same diameter as the small diameter portion 13 c of the inner connection portion 13. The large diameter portion 14 a is formed to have substantially the same diameter as the large diameter portion 13 a of the inner connection portion 13. The distal end portion of the male coupler 12 passes through the outer connection portion 14 from the opening on the small diameter portion 14c side through the opening on the large diameter portion 14a side.

  Between the large-diameter portion 14a of the outer connecting portion 14 and the outer peripheral surface of the distal end portion of the male coupler 12, the second backup ring 16 and the second O-ring 19 are provided from the opening side of the coupler receiving portion 35 toward the bottom side. And the other part of the washer 17 are arranged in this order. Specifically, the second backup ring 16 and the other part of the washer 17 are press-fitted and fixed to the large-diameter part 14 a of the outer connection part 14, and the second backup ring 16 is a step part of the outer connection part 14. 14b. Further, the second O-ring 19 is sandwiched between the second backup ring 16 and the washer 17.

  FIG. 3 is an enlarged side sectional view of a main part of the hydraulic coupler 10. In FIG. 3, an inner press-fit surface 17 a that is press-fitted into the large-diameter portion 13 a of the inner connection portion 13 and an outer press-fit surface 17 b that is press-fit into the large-diameter portion 14 a of the outer connection portion 14 are formed on the outer periphery of the washer 17. Has been. Further, on the outer periphery of the washer 17, a first concave groove 17c is formed over the entire circumference in the circumferential direction between the inner press-fitting surface 17a and the outer press-fitting surface 17b. The second concave groove 17d is formed over the entire circumference in the circumferential direction. The second concave groove 17d faces the opening 12a1 of the oil supply passage 12a of the male coupler 12 in a state where the male coupler 12 is inserted into the female coupler 11. Further, the washer 17 is formed with a plurality of through-holes 17e communicating with the bottom of the first concave groove 17c and the bottom of the second concave groove 17d at predetermined intervals in the circumferential direction.

  Thereby, the oil supplied into the female coupler 11 from the opening 12a1 of the oil supply passage 12a of the male coupler 12 passes through the second concave groove 17d, the through hole 17e and the first concave groove 17c of the washer 17, and ishes. 17 is guided radially outward. Then, the oil guided radially outward of the washer 17 passes through the annular gap S1 between the opening side end surface of the inner connection portion 13 and the bottom side end surface of the outer connection portion 14, and then the inner connection It passes through a gap S2 between the outer peripheral surface 13d of the portion 13 and the small diameter hole portion 35b of the coupler receiving portion 35 and is guided into the oil sealing passage 36.

  FIG. 4 is a side sectional view showing a state in which the outer peripheral surface of the inner connecting portion 13 of the female coupler 11 is pressed against the oil sealing passage 36 side of the inner peripheral surface of the coupler receiving portion 35. FIG. 5 is a side view showing the inner connecting portion 13 of the female coupler 11. As shown in FIG. 4, when an external force such as a hydraulic hose acts on the distal end portion of the male coupler 12, the outer peripheral surface 13 d of the inner connection portion 13 is connected to the oil-filled passage 36 on the inner peripheral surface of the coupler receiving portion 35. It may be pressed against the opening edge 36a (see FIG. 5).

  In this case, since the gap S2 (see FIG. 3) is eliminated, the oil in the gap S1 cannot be guided to the oil filling passage 36 via the gap S2. Therefore, in this embodiment, even in such a case, the gap S1 and the oil sealing passage 36 are communicated with the outer periphery of the inner connection portion 13 so that the oil can be guided to the oil sealing passage 36. For this purpose, a groove 13e, which is a communication structure, is formed extending in the circumferential direction. The groove 13e is formed on the outer side of the opening edge 36a (hatching in FIG. Part) and the inside (double hatched part in FIG. 5) are formed to communicate with each other. Thereby, the oil in the clearance S1 flows along the groove portion 13e by flowing into the groove portion 13e through the portion of the outer peripheral surface 13d of the inner connection portion 13 that is not pressed against the opening edge 36a. The opening edge 36a can be guided from the outside to the inside.

  4 and 5, the groove 13 e is formed to be recessed in a radially inward direction from the outer peripheral surface 13 d of the inner connection portion 13 and is formed over the entire circumference in the circumferential direction. In addition, the groove 13e has a predetermined interval L (for example, 0.8 mm) on the bottom side (lower side in FIG. 5) than the end face on the opening side (upper side in FIG. 5) of the inner connection portion 13 in the side view of FIG. And is formed extending in the horizontal direction. The groove width d of the groove 13e is set to be shorter than the hole diameter D (see FIG. 4) of the oil sealing passage 36. In the present embodiment, the groove width d is set to 1.8 mm, and the hole diameter D is set to 3.0 mm. Further, the groove depth h of the groove 13e is set to 0.2 mm.

  According to the torque limiter 1 configured as described above, the outer peripheral surface 13d of the inner connection portion 13 of the female coupler 11 is pressed against the opening edge 36a of the oil sealing passage 36 on the inner peripheral surface of the coupler receiving portion 35. Even in the state, the oil flowing through the gap S1 between the inner connecting portion 13 and the outer connecting portion 14 is guided to the oil filled passage 36 by flowing through the outer peripheral surface 13d of the inner connecting portion 13 and through the groove portion 13e. . Thus, even if the outer peripheral surface 13 d of the female coupler 11 is pressed against the oil sealing passage 36 side of the inner peripheral surface of the coupler receiving portion 35, oil can be guided to the oil sealing passage 36. Oil can be enclosed.

  Further, since the groove portion 13 e is formed over the entire outer periphery of the inner connection portion 13, the groove portion 13 e is opened to the oil filled passage 36 when the inner connection portion 13 is disposed in the coupler receiving portion 35. It is not necessary to align in the circumferential direction so as to face the edge 36a. Thereby, the connection work of the hydraulic coupler 10 can be performed easily.

  Moreover, since the groove part 13e is formed in the bottom part side rather than the end surface by the side of the opening of the inner side connection part 13, it originates in forming the groove part 13e in the inner side connection part 13, and an inner side connection part It is possible to prevent the area of the end face on the opening side of 13 from decreasing. Thereby, since it can prevent that a contact surface pressure with the end surface by the side of the bottom part of the outer side connection part 14 becomes high in the end surface of the opening side of the inner side connection part 13, it can prevent effectively that the inner side connection part 13 is damaged. be able to.

  In addition, although the groove part 13e in this embodiment is formed over the perimeter of the circumferential direction in the outer periphery of the inner side connection part 13, you may form in a part of circumferential direction. Moreover, the groove part 13e may be formed in multiple numbers at predetermined intervals in the axial direction of the inner side connection part 13. As shown in FIG.

  Furthermore, although the groove part 13e in this embodiment is formed in the cross-sectional concave shape, it can be formed in arbitrary shapes, such as cross-sectional arc shape and cross-sectional V shape. Further, the groove 13e in the present embodiment is formed with a predetermined interval L on the bottom side of the opening side end face of the inner connection portion 13, but without providing the predetermined interval L, the opening of the inner connection portion 13 is formed. You may make it form by shaving the end surface of the side.

FIG. 6 is an enlarged cross-sectional side view of a main part showing a hydraulic coupler of a torque limiter according to the second embodiment of the present invention. The hydraulic coupler of the present embodiment is different from the hydraulic coupler of the first embodiment in the configuration of the communication structure formed on the outer periphery of the inner connecting portion 13.
In FIG. 6, the communication structure of the present embodiment includes a protruding portion 13 f formed on the outer periphery of the inner connecting portion 13 over the entire periphery. The projecting portion 13f is more radially outward than the outer peripheral surface 13d of the inner connecting portion 13 (on the inner peripheral surface side of the coupler receiving portion 35) on the bottom side of the coupler receiving portion 35 with respect to the opening edge 36a of the oil sealing passage 36. ) Protruding.

  Also in the present embodiment, when an external force such as a hydraulic hose acts on the distal end portion of the male coupler 12, the outer peripheral surface 13 d of the inner connection portion 13 is an opening edge of the oil sealing passage 36 on the inner peripheral surface of the coupler receiving portion 35. It may be pressed against the 36a side. In this case, the bottom side of the outer periphery of the inner connection portion 13 moves toward the bottom side of the inner peripheral surface of the coupler receiving portion 35, but a protrusion 13 f is formed on the bottom side of the outer periphery of the inner connection portion 13. Therefore, the protruding portion 13f contacts the inner peripheral surface of the coupler receiving portion 35 before the outer peripheral surface 13d. At this time, since the protruding portion 13f contacts the bottom side of the opening edge 36a, the outer peripheral surface 13d is not pressed against the opening edge 36a of the oil sealing passage 36.

As a result, the gap S2 continues to exist between the outer peripheral surface 13d of the inner connection portion 13 and the small-diameter hole portion 35b of the coupler receiving portion 35. Therefore, the end surface on the opening side of the inner connection portion 13 and the outer connection portion 14 The oil in the annular gap S1 between the bottom end face passes through the gap S2 and is guided to the oil sealing passage 36 from the opening edge 36a.
In addition, since it is the same as that of 1st Embodiment about the other structure of the torque limiter of this embodiment, the description is abbreviate | omitted.

  According to the torque limiter of the present embodiment configured as described above, the outer peripheral surface 13d of the inner connecting portion 13 of the female coupler 11 is on the opening edge 36a side of the oil sealing passage 36 on the inner peripheral surface of the coupler receiving portion 35. When pressed against, the protruding portion 13f of the inner connecting portion 13 contacts the inner peripheral surface of the coupler receiving portion 35 before the outer peripheral surface 13d. At this time, since the projecting portion 13f is in contact with the bottom side of the opening edge 36a, the oil sealing passage 36 can be prevented from being blocked by the inner connecting portion 13. Thereby, the oil flowing through the gap S1 between the inner connection portion 13 and the outer connection portion 14 passes through the gap S2 and is guided to the oil sealing passage 36 from the opening edge 36a. Therefore, even if the outer peripheral surface 13 d of the female coupler 11 is pressed against the oil sealing passage 36, the oil can be guided to the oil sealing passage 36, so that the oil can be sealed in the hydraulic expansion chamber 33.

  Further, since the protruding portion 13 f is formed over the entire outer periphery of the inner connecting portion 13, when the inner connecting portion 13 is disposed in the coupler receiving portion 35, the protruding portion 13 f is inserted into the oil filled passage 36. There is no need to align in the circumferential direction so as to be disposed on the opening edge 36a side. Thereby, the connection work of the hydraulic coupler 10 can be performed easily.

  In addition, although the protrusion part 13f in this embodiment is formed over the perimeter of the circumferential direction in the outer periphery of the inner side connection part 13, you may form in a part of circumferential direction. A plurality of protruding portions 13f may be formed at predetermined intervals in the axial direction of the inner connecting portion 13. Furthermore, although the protrusion part 13f in this embodiment is formed in cross-sectional convex shape, it is not limited to this, It can be formed in arbitrary shapes in consideration of workability etc.

  1: torque limiter, 2: shaft member, 3: cylindrical member, 10: hydraulic coupler (fluid pressure coupler), 11: female coupler, 12: male coupler, 13: inner connection, 13d: outer peripheral surface, 13e: groove ( Communication structure), 13f: projecting portion (communication structure), 14: outer connection portion, 33: hydraulic expansion chamber (fluid pressure expansion chamber), 35: coupler receiving portion, 36: oil filled passage (fluid filled passage), 36a : Opening edge, S1: gap

Claims (6)

A shaft member;
A fluid pressure expansion chamber formed inside, a concave coupler receiving portion opened to the outer peripheral side, and a fluid sealing passage communicating the inner peripheral surface of the coupler receiving portion and the fluid pressure expansion chamber. A cylindrical member fitted on the shaft member;
A fluid pressure coupler connected to the coupler receiving portion of the cylindrical member, and for enclosing a fluid in the fluid pressure expansion chamber;
The fluid pressure expansion chamber is radially expanded by a fluid sealed in the chamber, and the cylinder member and the shaft member are frictionally coupled to transmit torque between the two members, while the friction engagement is performed. A torque limiter that releases the transmission of the torque by releasing
The fluid pressure coupler has a cylindrical inner connecting portion disposed on the bottom side of the coupler receiving portion and a cylindrical outer connecting portion disposed on the opening side of the coupler receiving portion. A female coupler in which an annular gap for guiding the fluid to the fluid sealing passage is formed between the connecting portions, and a male coupler whose tip is inserted into the female coupler;
The outer periphery of the inner connection portion is connected to communicate the gap and the fluid sealing passage in a state where the outer peripheral surface is pressed against the opening edge side of the fluid sealing passage on the inner peripheral surface of the coupler receiving portion. A torque limiter characterized in that a structure is formed.   The torque limiter according to claim 1, wherein the communication structure includes a groove portion formed to extend in a circumferential direction of the outer periphery of the inner connection portion.   The torque limiter according to claim 2, wherein the groove portion is formed over the entire outer periphery of the inner connection portion.   4. The torque limiter according to claim 2, wherein the groove is formed at a predetermined interval on the bottom side with respect to an end surface on the opening side of the inner connection portion. 5.   The communication structure includes a projecting portion that is formed on the bottom side of the opening edge of the fluid sealing passage and so as to project from the outer peripheral surface of the inner connection portion to the inner peripheral surface side of the coupler receiving portion. The torque limiter according to 1.   The torque limiter according to claim 5, wherein the protruding portion is formed over the entire outer periphery of the inner connection portion.

Images