WO2021260961A1 - 双方向トルクリミッタ - Google Patents
双方向トルクリミッタ Download PDFInfo
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- WO2021260961A1 WO2021260961A1 PCT/JP2020/037305 JP2020037305W WO2021260961A1 WO 2021260961 A1 WO2021260961 A1 WO 2021260961A1 JP 2020037305 W JP2020037305 W JP 2020037305W WO 2021260961 A1 WO2021260961 A1 WO 2021260961A1
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- coil spring
- input
- locking piece
- ring
- output
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/022—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D43/00—Automatic clutches
- F16D43/02—Automatic clutches actuated entirely mechanically
- F16D43/20—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D43/00—Automatic clutches
- F16D43/02—Automatic clutches actuated entirely mechanically
- F16D43/20—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
- F16D43/21—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members
- F16D43/211—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with radially applied torque-limiting friction surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
Definitions
- the present invention relates to a bidirectional torque limiter using two coil springs.
- a bidirectional torque limiter can be adopted as a mechanical component for holding a driven member (output side device) such as a hatchback at an arbitrary angle position without using electrical means.
- a driven member output side device
- Patent Document 2 includes an outer ring and an inner ring having a common central axis, and an outer coil spring and an inner coil spring are mounted on the outer peripheral surface and the inner peripheral surface of the outer ring, respectively.
- the bidirectional torque limiter is disclosed (the "outer ring” and “inner ring” referred to herein are “inner ring 2" and “cylindrical fold 1 m of outer ring 1" in Patent Document 2, respectively).
- the inner diameter of the outer coil spring in the free state is smaller than the outer diameter of the outer ring, and the inner peripheral surface of the outer coil spring is in close contact with the outer peripheral surface of the outer ring in the stationary state.
- the outer coil spring is provided with an outer hook portion, and the outer hook portion is fixed to a housing integrated with the inner ring.
- the outer diameter of the inner coil spring in the free state is larger than the inner diameter of the outer ring, and the outer peripheral surface of the inner coil spring is in close contact with the inner peripheral surface of the outer ring in the stationary state.
- the inner coil spring comprises an inner hook portion, which is connected to an auxiliary member that is rotatable with respect to the housing.
- the winding direction of each of the wire rods of the outer coil spring and the inner coil spring is the same when viewed from one of the circumferential directions. That is, the direction in which the inner hook portion is pushed in the circumferential direction to loosen the tightening force of the inner coil spring and the direction in which the outer hook portion is pushed in the circumferential direction to loosen the tightening force of the outer coil spring are viewed from one of the axial directions. Is the same.
- the inner coil spring rotates (slips) with respect to the outer ring, and the rotational torque is not transmitted.
- the rotational torque is smaller than the first predetermined torque, the auxiliary member and the housing rotate integrally. That is, the rotational torque is transmitted.
- the operation is as follows. That is, the inner hook portion of the inner coil spring is pushed by the auxiliary member, and the outer hook portion of the outer coil spring is pushed by the housing in the direction in which the diameter of each coil spring is expanded. As a result, the frictional force between the inner coil spring and the outer ring increases, but the frictional force between the outer coil spring and the outer ring decreases. Therefore, when the rotational torque is larger than the second predetermined torque, the outer coil spring rotates (slips) with respect to the outer ring, and the rotational torque is not transmitted. When the rotational torque is smaller than the second predetermined torque, the auxiliary member and the housing rotate integrally. That is, the rotational torque is transmitted.
- the housing is fixed to the vehicle and the auxiliary member is connected to a drive member such as an electric motor.
- the electric motor can open and close the hatchback by applying a rotational torque larger than the first predetermined torque and the second predetermined torque to the auxiliary member. If the electric motor is stopped while the hatchback is fully open or in the intermediate position, a predetermined load torque due to the weight of the hatchback is applied to the auxiliary member, but the applied torque is the first predetermined torque and the second predetermined torque. If it is smaller than, the hatchback is held in the above-mentioned stopped position.
- the bidirectional torque limiter can open and close the hatchback even if the electric motor has a light load, and the hatchback, which is a relatively heavy object, is fully opened or intermediate. It is preferable that it can be reliably held in position. From this, when the rotation is input from the drive side, the member connected to the drive side and the member connected to the driven side start relative rotation than when the rotation is input from the driven side. It is preferable that the torque (also referred to as slip torque) is set small.
- the present invention has been made in view of the above facts, and its main technical problem is to set the slip torque when rotation is input from the drive side to be smaller than the slip torque when rotation is input from the driven side. It is to provide a new and improved bidirectional torque limiter that can be used.
- the present inventor sets the force with which the outer coil spring tightens the outer ring to be smaller than the force with which the inner coil spring tightens the inner ring, and when rotational torque is applied from the drive side, the outer coil spring expands.
- the diameter is adjusted and slipped with respect to the outer ring, and when rotational torque is applied from the driven side, the inner coil spring expands in diameter and slips with respect to the inner ring, thereby solving the above-mentioned main technical problem. I found that I could do it.
- an input member and an output member and an outer ring and an inner ring having a common central axis are provided.
- An input locking piece extending in the axial direction is formed in the input member
- an output locking piece extending in the axial direction is formed in the output member
- the input locking piece and the output locking piece are 2 in the circumferential direction. It is installed in combination so that there are individual gaps
- An outer coil spring is mounted on the outer peripheral surface of the outer ring, the inner diameter of the outer coil spring in a free state is smaller than the outer diameter of the outer ring, and the outer coil spring tightens the outer ring with a relatively small tightening force.
- the outer coil spring is provided with two outer hook portions at different angular positions in the circumferential direction, and each of the two outer hook portions is inserted into each of the two gaps.
- An inner coil spring is mounted on the outer peripheral surface of the inner ring, the inner diameter of the inner coil spring in a free state is smaller than the outer diameter of the inner ring, and the inner coil spring tightens the inner ring with a relatively large tightening force.
- the inner coil spring is provided with two inner hook portions at different angular positions in the circumferential direction, and each of the two inner hook portions is inserted into a hook groove formed on the inner peripheral surface of the outer ring or the inner peripheral surface of the outer ring is inserted.
- a bidirectional torque limiter is provided characterized in that the inner coil spring is expanded in diameter by pushing the other of the portions.
- the input member and the output member, the outer ring and the inner ring are housed in a housing, and the inner ring is fixed to the housing.
- the housing has a storage space having a circular cross section, and the cross-sectional shapes of the input locking piece and the output locking piece are both arcuate, and the input locking piece and the output locking piece are both arcuate.
- the outer peripheral surface of the piece should be slidable with respect to the inner peripheral surface of the housing. Further, it is preferable that a groove extending in the axial direction is formed on the outer peripheral surfaces of the input locking piece and the output locking piece.
- the input member is provided with the input locking piece and has an input plate perpendicular to the axial direction
- the output member is provided with the output locking piece and is provided with the output locking piece in the axial direction.
- a vertical output plate is provided, and the input plate and the output plate are installed so as to face each other in the axial direction.
- the input plate is formed with an input shaft inserted inside the inner ring.
- the cross-sectional shape of the outer coil spring and the wire rod constituting the inner coil spring is rectangular.
- the outer coil spring and the inner coil spring are coated with a lubricant.
- the outer coil spring is mounted on the outer peripheral surface of the outer ring with a relatively small tightening force
- the inner coil spring is mounted on the outer peripheral surface of the inner ring with a relatively large tightening force.
- FIG. 3 is a perspective view showing each component of the bidirectional torque limiter shown in FIG. 1 in an exploded manner.
- the figure which shows the 1st modification of the bidirectional torque limiter shown in FIG. The figure which shows the 2nd modification of the bidirectional torque limiter shown in FIG.
- the bidirectional torque limiter configured according to the present invention and indicated by the number 2 as a whole includes an input member 4 and an output member 6 and an outer ring 8 and an inner ring 10 having a common central axis o. It is equipped with.
- "one side in the axial direction” and “the other side in the axial direction” in the following description are referred to in the same figure as “one side in the axial direction” with reference to the state shown in the central longitudinal section of FIG.
- the left side and the "other side in the axial direction” refer to the right side in the figure.
- the input member 4 is made of synthetic resin and includes a circular input plate 12 perpendicular to the axial direction.
- a cylindrical input shaft 14 extending toward one side in the axial direction is formed in the center of the input plate 12.
- the input shaft 14 penetrates in the axial direction, and a spline 16 extending along the axial direction is formed on the inner peripheral surface.
- the input shaft 14 is connected to a drive member such as an electric motor via a spline 16.
- An outer annular ridge 18 is formed on one side surface of the input plate 12 in the axial direction along the outer peripheral edge thereof. Inside the outer annulus ridge 18, an inner annulus ridge 20 is also formed concentrically with the outer annulus ridge 18.
- the input member 4 is also formed with an input locking piece 26 extending in the axial direction.
- the input locking piece 26 is a single plate-shaped piece having an arc-shaped cross section formed on the outer peripheral surface of the input plate 12 and extending toward one side in the axial direction.
- a plurality of grooves 28 extending linearly along the axial direction are formed on the outer peripheral surface of the input locking piece 26 at equal angular intervals in the circumferential direction.
- the output member 6 is made of synthetic resin and includes a circular output plate 30 perpendicular to the axial direction.
- the output plate 30 is arranged so that one side surface in the axial direction faces the other side surface in the axial direction of the input plate 12 in the axial direction.
- a cylindrical output shaft 32 extending toward the other side in the axial direction is formed in the center of the output plate 30.
- the output shaft 32 penetrates in the axial direction, and a spline 34 extending along the axial direction is formed on the outer peripheral surface.
- the output shaft 32 is connected to a driven member such as a hatchback via a spline 34.
- the output member 6 is also formed with an output locking piece 36 extending in the axial direction.
- the output locking piece 36 is a single plate-shaped piece having an arc-shaped cross section formed on the outer peripheral surface of the output plate 30 and extending toward one side in the axial direction.
- a single groove 38 extending linearly along the axial direction is formed at the center of the outer peripheral surface of the output locking piece 36 in the circumferential direction.
- such an input member 4 and an output member 6 are arranged in combination so that the input locking piece 26 and the output locking piece 36 have two gaps 39a and 39b in the circumferential direction. ..
- the outer ring 8 is a metal cylindrical member having a required length in the axial direction, and is an input locking piece 26 and an output locking piece 36. It is located inside the.
- the other end in the axial direction of the outer ring 8 is fitted between the outer annular ridge 18 and the inner annular ridge 20 of the input member 4, and the input member 4 is rotatable with respect to the outer ring 8.
- a hook groove 40 extending linearly along the axial direction is formed on the inner peripheral surface of the outer ring 8.
- the hook groove 40 has a fan shape in a plan view, and is formed by locally increasing the inner diameter of the outer ring 8.
- An outer coil spring 42 is mounted on the outer peripheral surface of such an outer ring 8.
- the outer coil spring 42 is formed by winding a metal wire having a rectangular cross section, the inner diameter of the outer coil spring 42 in a free state is smaller than the outer diameter of the outer ring 8, and the outer coil spring 42 contains a lubricant. It has been applied.
- the cross section of the wire may be circular. The tightening force of the outer coil spring 42 with respect to the outer ring 8 will be described later.
- the outer coil spring 42 includes two outer hook portions 44a and 44b at different angular positions in the circumferential direction. In the illustrated embodiment, the wire rod constituting the outer coil spring 42 is wound clockwise from one side in the axial direction toward the other side (that is, in FIG.
- the outer hook portions 44a and 44b are formed by bending outward. As shown in FIG. 2, each of the outer hook portions 44a and 44b of the outer coil spring 42 is inserted into each of the two gaps 39a and 39b. Then, when the input member 4 rotates with respect to the outer ring 8, the input locking piece 26 has a direction in which the outer coil spring 42 expands the diameter of either one of the outer hook portions 44a and 44b according to the rotation direction. push.
- the output locking piece 36 has a direction in which the outer coil spring 42 reduces the diameter of either one of the outer hook portions 44a and 44b according to the rotation direction. push.
- the outer coil spring 42 tightens the outer ring 8 with a relatively small tightening force (that is, the difference between the inner diameter of the outer coil spring 42 and the outer diameter of the outer ring 8 in the free state is relatively small).
- first predetermined torque when the coil spring 42 starts rotating with respect to the outer ring 8 is relatively small.
- the inner ring 10 is a metal cylindrical member having the same axial length as the outer ring 8, and is arranged inside the outer ring 8.
- the input shaft 14 of the input member 4 is inserted inside the inner ring 10.
- the other end of the inner ring 10 in the axial direction is fitted between the input shaft 14 of the input member 4 and the inner annular ridge 20, and the input member 4 is rotatable with respect to the inner ring 10.
- the inner ring 10 is fixed by a shield plate which is a part of the housing.
- a plurality of engaging protrusions 46 protruding inward in the radial direction are provided at equal intervals in the circumferential direction.
- An inner coil spring 48 is mounted on the outer peripheral surface of such an inner ring 10.
- the inner coil spring 48 is formed by winding a metal wire having a rectangular cross section, the inner diameter of the inner coil spring 48 in a free state is smaller than the outer diameter of the inner ring 10, and the inner coil spring 48 has a lubricant. It has been applied. The tightening force of the inner coil spring 48 with respect to the inner ring 10 will be described later. Further, the inner coil spring 48 is provided with two inner hook portions 50a and 50b at different angular positions in the circumferential direction. In the illustrated embodiment, the wire rod constituting the inner coil spring 48 is wound clockwise from one side in the axial direction toward the other side (that is, in FIG.
- the inner hook portions 50a and 50b are formed by bending outward. As shown in FIG. 2, each of the inner hook portions 50a and 50b of the inner coil spring 48 is commonly inserted into the hook groove 40 formed on the inner peripheral surface of the outer ring 8. Then, when the outer ring 8 rotates with respect to the inner ring 10, the outer ring 8 pushes either one of the inner hook portions 50a and 50b in the direction in which the inner coil spring 48 expands in diameter according to the rotation direction.
- the inner coil spring 48 tightens the inner ring 10 with a relatively large tightening force (that is, the difference between the inner diameter of the inner coil spring 48 and the outer diameter of the inner ring 10 in the free state is relatively large).
- a relatively large tightening force that is, the difference between the inner diameter of the inner coil spring 48 and the outer diameter of the inner ring 10 in the free state is relatively large.
- the input member 4 and the output member 6, the outer ring 8 and the inner ring 10 are housed in the housing 52, and the inner ring 10 is fixed to the housing 52.
- the housing 52 is composed of a housing main body 54 having a storage space portion 53 having a circular cross section, and a shield 56 that closes the storage space portion 53 of the housing main body 54.
- the housing body 54 is made of synthetic resin and has a circular end plate 58 and a cylindrical shape extending from the outer peripheral edge of the end plate 58 toward one side in the axial direction. It has a cup shape with an outer peripheral wall 60.
- a circular through hole 62 is formed in the center of the end plate 58, and the output shaft 32 is inserted through the through hole 62.
- Two annular ridges 64 are concentrically formed on one side surface of the end plate 58 in the axial direction so as to surround the through hole 62.
- a substantially cylindrical outer peripheral ridge 66 is formed on the outer peripheral edge portion of the other side surface in the axial direction of the end plate 58, and a plurality of recesses are formed on the outer peripheral surface of the outer peripheral ridge 66 at equal angular intervals in the circumferential direction.
- 68 is formed.
- a rectangular engaging notch 70 opened on one side in the axial direction and an engaging protrusion 72 protruding inward in the radial direction are alternately three at equal angular intervals in the circumferential direction. It is provided one by one.
- the shield 56 is made of synthetic resin and includes a circular substrate 74.
- a circular through hole 76 is formed in the center of the substrate 74, and a shaft (indicated by a two-dot chain line in FIGS. 10 and 11) that meshes with the spline 16 of the input shaft 14 is inserted through the through hole 76.
- a plurality of substantially rectangular engaging protrusions 78 projecting toward one side in the axial direction are provided on the outer peripheral edge portion of one side surface in the axial direction of the substrate 74 at equal angular intervals in the circumferential direction.
- a cylindrical inner side wall 80 that surrounds the outer peripheral edge of the through hole 76 and extends toward the other side in the axial direction is formed.
- the other end face in the axial direction of the inner side wall 80 faces the one end face in the axial direction of the input shaft 14 and supports it in the axial direction.
- a plurality of engaged protrusions 82 projecting outward in the radial direction are provided on the outer peripheral surface of the inner side wall 80 at equal angular intervals in the circumferential direction.
- Cylindrical intermediate walls 84 are concentrically formed on the outside of the inner side wall 80 so as to surround the inner side wall 80.
- an axial one-sided end portion of the inner ring 10 is inserted between the inner side wall 80 and the intermediate wall 84, and the inner ring 10 is fixed to the shield 56 by engagement between the engaging protrusion 46 and the engaged protrusion 82.
- a cylindrical outer wall 86 is concentrically formed on the outer side of the intermediate wall 84 so as to surround the intermediate wall 84.
- one end of the outer ring 8 in the axial direction is inserted between the outer wall 86 and the intermediate wall 84, and the outer ring 8 is rotatable with respect to the shield 56.
- An annular bulging portion 88 that bulges outward in the radial direction is formed on the outer peripheral surface of the outer side wall 86.
- An engaged protrusion 90 and an engaged protrusion 92 that engage with the engaging notch 70 and the engaging protrusion 72 of the housing body 54 are formed on the outer peripheral surface of the annular bulging portion 88, and these are engaged.
- the housing body 54 and the shield 56 are connected to each other so as not to rotate relative to each other.
- the housing body 54 and the shield 56 thus joined, that is, the housing 52 are formed by fitting a protrusion (not shown) into the recess 68 of the housing body 54 and a recess (not shown) into the engaging protrusion 78 of the shield 56. It is fixed to the vehicle etc. If desired, a lubricant may be encapsulated in the housing 52.
- FIGS. 10 and 11 First, a case where a rotational torque is applied to the input member 4 in the clockwise direction (as viewed from the right side of the central vertical cross section in FIG. 10; the same applies hereinafter) from a drive member such as an electric motor will be described with reference to FIG. do.
- a rotational torque is applied to the input member 4 in the clockwise direction (as viewed from the right side of the central vertical cross section in FIG. 10; the same applies hereinafter) from a drive member such as an electric motor
- the input locking piece 26 rotates clockwise and pushes the outer hook portion 44a of the outer coil spring 42 clockwise.
- the torque when the outer coil spring 42 starts rotating with respect to the outer ring 8 is the torque when the inner coil spring 48 starts rotating with respect to the inner ring 10 (second predetermined torque). Since it is set to be smaller than the predetermined torque), the outer coil spring 42 rotates with respect to the outer ring 8 before the inner coil spring 48 rotates with respect to the inner ring 10. Therefore, when the rotational torque applied to the input member 4 is larger than the first predetermined torque, the input locking piece 26 pushes the outer hook portion 44a of the outer coil spring 42 clockwise to push the outer coil.
- the spring 42 slips with respect to the outer ring 8, and the input locking piece 26 comes into contact with the output locking piece 36 via the outer hook portion 44a, rotates clockwise together with the output locking piece 36, and outputs from the input member 4.
- the rotation is transmitted to the member 6. That is, rotation can be transmitted from the input member 4 to the output member 6 even with a relatively small rotational torque.
- the input locking piece 26 pushes the outer hook portion 44b of the outer coil spring 42 counterclockwise, and the outer ring 8 counterclockwise the inner hook portion 50b of the inner coil spring 48. Except for pushing in the clockwise direction, the input member 4 is the same as the case where the input member 4 is rotated in the clockwise direction. Therefore, detailed description thereof will be omitted.
- the coil spring 48 is pushed in the direction of increasing the diameter, and the frictional force between the inner peripheral surface of the inner coil spring 48 and the outer peripheral surface of the inner ring 10 is reduced. From this, when the rotational torque applied to the output member 6 is larger than the second predetermined torque, the outer ring 8 pushes the inner hook portion 50b of the inner coil spring 48 counterclockwise to push the inner coil spring. 48 slips with respect to the inner ring 10, and the output locking piece 36 comes into contact with the input locking piece 26 via the outer hook portion 44b of the outer coil spring 42, and is integrated with the input locking piece 26 to rotate counterclockwise. The rotation is transmitted from the output member 6 to the input member 4. That is, the rotation cannot be transmitted from the output member 6 to the input member 4 unless the rotational torque is relatively large.
- the output locking piece 36 pushes the outer hook portion 44b of the outer coil spring 42 clockwise, and the outer ring 8 pushes the inner hook portion 50a of the inner coil spring 48 clockwise. Except for pressing, the output member 6 is the same as when it is rotated counterclockwise, and therefore detailed description thereof will be omitted.
- the outer coil spring 42 has a relatively small tightening force on the outer peripheral surface of the outer ring 8
- the inner coil spring 48 has a relatively large tightening force on the outer peripheral surface of the inner ring 10.
- the slip torque when the rotation is input to the input member 4 is set to be smaller than the slip torque when the rotation is input to the output member 6.
- the input locking piece 26 and the output locking piece 36 are slidable with respect to the inner peripheral surface of the housing 52. Therefore, the input locking piece 26 or the output locking piece 36 is prevented from falling outward in the radial direction.
- the grooves 28 and 38 extending in the axial direction are formed on the outer peripheral surfaces of the input locking piece 26 and the output locking piece 36, the outer peripheral surfaces of the input locking piece 26 and the output locking piece 36 and the housing are formed.
- the contact area of the 52 with the inner peripheral surface is reduced, and the sliding resistance when the input locking piece 26 and the output locking piece 36 rotate with respect to the housing 52 is reduced.
- the grooves 28 and 38 can also serve as a lubricant reservoir.
- FIGS. 12 to 14 A modification of the bidirectional torque limiter shown in FIG. 1 configured according to the present invention will be described with reference to FIGS. 12 to 14. Since the overall configuration of each bidirectional torque limiter shown in FIGS. 12 to 14 is the same as the configuration of the bidirectional torque limiter 2 shown in FIG. 1, the same configuration as that of the bidirectional torque limiter 2 is attached. "'", “'" Or “'” is added to the number, and the detailed explanation thereof is omitted. The same effect as that of the bidirectional torque limiter 2 can be obtained in the bidirectional torque limiter 2 ′, 2 ′′ and 2 ′′ ′′.
- FIG. 12 is a diagram showing a cross section of the bidirectional torque limiter 2 ′ at the same position as the BB cross section of the bidirectional torque limiter 2, which corresponds to FIG.
- the wire rod constituting the outer coil spring 42 is clockwise from one side in the axial direction to the other side (that is, in FIG. 2).
- the wire constituting the outer coil spring 42' is wound counterclockwise from one side in the axial direction to the other side (that is, in FIG. 12). ..
- the wires constituting the inner coil springs 48 and 48' are both wound clockwise from one side in the axial direction toward the other side (that is, in FIGS. 12 and 2).
- the bidirectional torque limiter 2' the positional relationship between the input locking piece 26 and the output locking piece 36 in the bidirectional torque limiter 2 is interchanged.
- two inner hook portions 50a ′′ and 50b ′′ provided by the inner coil spring 48 ′′ by forming a hook ridge 41 ′′ on the inner peripheral surface of the outer ring 8 ′′.
- Each of them is arranged on both sides of the hook ridge 41 ′′, and the wire rod constituting the inner coil spring 48 ′′ is also directed from one side to the other side in the axial direction (that is, like the wire rod constituting the outer coil spring 42 ′′ ′′. It may be wound counterclockwise (in FIG. 13).
- the hook ridge 41 ′′ is formed in the hook groove 40 ′′.
- FIG. 14 shows an exploded perspective view of the bidirectional torque limiter 2 ′′, which corresponds to FIG.
- the bidirectional torque limiter 2 ′′ in the bidirectional torque limiter 2 ′′, the positions of the input locking piece 26 and the output locking piece 36 in the bidirectional torque limiter 2
- the member that was the input member 4 is the output member 6 ′′ and the member that was the output member 6 is the input member 4 ′′.
- the inner side wall 80 "" and the engaged protrusion 82 "" are formed not on the shield 56 ", but on the housing body 54", and the inner ring 10 "" is fixed to the housing body 54 "”. Has been done.
- the bidirectional torque limiter configured according to the present invention has been described in detail with reference to the attached drawings, the present invention is not limited to the above-described embodiment and is appropriate as long as it does not deviate from the present invention. It can be modified or changed.
- the input locking piece and the output locking piece are both single plate-shaped pieces having an arc-shaped cross section, but instead, they are both arranged at intervals in the circumferential direction. It may be a pair of rod-shaped pieces.
- one of the input locking pieces which is a pair of rod-shaped pieces
- one of the output locking pieces which is a pair of rod-shaped pieces
- the other of the input locking pieces which are a pair of rod-shaped pieces, and a pair of rod-shaped pieces.
- a gap is defined with the other of the output locking pieces.
- the two inner hook portions are commonly inserted into the hook grooves formed on the inner peripheral surface of the outer ring, but instead of this, a plurality of inner hook portions are inserted on the inner peripheral surface of the outer ring.
- a hook groove may be formed so that the two hook portions are separately inserted into any of the plurality of hook grooves.
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Abstract
Description
前記入力部材には軸方向に延びる入力係止片が、前記出力部材には軸方向に延びる出力係止片が夫々形成され、前記入力係止片及び前記出力係止片は、周方向に2個の間隙が存在するよう、組み合わされて設置されており、
前記外輪の外周面には外側コイルばねが装着され、自由状態における前記外側コイルばねの内径は前記外輪の外径よりも小さく、前記外側コイルばねは比較的小さな締付力で前記外輪を締め付けており、
前記外側コイルばねは周方向の異なる角度位置に2つの外側フック部を備え、前記2つの外側フック部の各々は前記2個の間隙の各々に挿入されており、
前記内輪の外周面には内側コイルばねが装着され、自由状態における前記内側コイルばねの内径は前記内輪の外径よりも小さく、前記内側コイルばねは比較的大きな締付力で前記内輪を締め付けており、
前記内側コイルばねは周方向の異なる角度位置に2つの内側フック部を備え、前記2つの内側フック部の各々は前記外輪の内周面に形成されたフック溝に挿入又は前記外輪の内周面に形成されたフック突条の両側に配置されており、
前記入力部材に回転トルクが付加されると、前記入力係止片が前記2つの外側フック部の一方を押して前記外側コイルばねは拡径され、
前記出力部材に回転トルクが付加されると、前記出力係止片が前記2つの外側フック部の一方を押して前記外側コイルばねは縮径されて前記外輪を締め付け、前記外輪が前記2つの内側フック部の他方を押して前記内側コイルばねは拡径される、ことを特徴とする双方向トルクリミッタが提供される。
最初に、入力部材4に電動モーターの如き駆動部材から時計方向(図10の中央縦断面の右方向から見て。以下同じ)に回転トルクが付加された場合について、図10を参照して説明する。この場合には、B-B断面に示すとおり、入力係止片26は時計方向に回転して外側コイルばね42の外側フック部44aを時計方向に押す。そして、外側コイルばね42は外輪8の外周面に装着されていることから、入力係止片26によって外側フック部44aが時計方向に押されたことで、外輪8が内側コイルばね48の内側フック部50aを時計方向に押す。このとき、外側フック部44a及び内側フック部50aは共に外側コイルばね42及び内側コイルばね48が拡径する方向に押される。そのため、外側コイルばね42の内周面と外輪8の外周面との間の摩擦力、及び内側コイルばね48の内周面と内輪10の外周面との間の摩擦力は共に低下するものの、上述したとおり、外側コイルばね42が外輪8に対して回転を開始する際のトルク(第一の所定トルク)は内側コイルばね48が内輪10に対して回転を開始する際のトルク(第二の所定トルク)よりも小さく設定されていることから、内側コイルばね48が内輪10に対して回転するよりも先に外側コイルばね42が外輪8に対して回転する。それ故に、入力部材4に付加された上記回転トルクが第一の所定トルクよりも大きい場合には、入力係止片26が外側コイルばね42の外側フック部44aを時計方向に押すことで外側コイルばね42が外輪8に対してスリップし、入力係止片26は外側フック部44aを介して出力係止片36と当接してこれと一体となって時計方向に回転し、入力部材4から出力部材6へ回転が伝達される。つまり、入力部材4から出力部材6へは比較的小さな回転トルクであっても回転を伝達することができる。
4:入力部材
6:出力部材
8:外輪
10:内輪
26:入力係止片
36:出力係止片
39a及び39b:間隙
40:フック溝
42:外側コイルばね
44a及び44b:外側フック部
48:内側コイルばね
50a及び50b:内側フック部
Claims (8)
- 共通の中心軸を有する、入力部材及び出力部材と外輪及び内輪とを具備し、
前記入力部材には軸方向に延びる入力係止片が、前記出力部材には軸方向に延びる出力係止片が夫々形成され、前記入力係止片及び前記出力係止片は、周方向に2個の間隙が存在するよう、組み合わされて設置されており、
前記外輪の外周面には外側コイルばねが装着され、自由状態における前記外側コイルばねの内径は前記外輪の外径よりも小さく、前記外側コイルばねは比較的小さな締付力で前記外輪を締め付けており、
前記外側コイルばねは周方向の異なる角度位置に2つの外側フック部を備え、前記2つの外側フック部の各々は前記2個の間隙の各々に挿入されており、
前記内輪の外周面には内側コイルばねが装着され、自由状態における前記内側コイルばねの内径は前記内輪の外径よりも小さく、前記内側コイルばねは比較的大きな締付力で前記内輪を締め付けており、
前記内側コイルばねは周方向の異なる角度位置に2つの内側フック部を備え、前記2つの内側フック部の各々は前記外輪の内周面に形成されたフック溝に挿入又は前記外輪の内周面に形成されたフック突条の両側に配置されており、
前記入力部材に回転トルクが付加されると、前記入力係止片が前記2つの外側フック部の一方を押して前記外側コイルばねは拡径され、
前記出力部材に回転トルクが付加されると、前記出力係止片が前記2つの外側フック部の一方を押して前記外側コイルばねは縮径されて前記外輪を締め付け、前記外輪が前記2つの内側フック部の他方を押して前記内側コイルばねは拡径される、ことを特徴とする双方向トルクリミッタ。 - 前記入力部材及び前記出力部材と、前記外輪及び前記内輪とはハウジングに収容され、前記内輪は前記ハウジングに固定されている、請求項1に記載の双方向トルクリミッタ。
- 前記ハウジングは断面円形の収容空間部を有し、前記入力係止片及び前記出力係止片の断面形状は共に円弧形状であって、前記入力係止片及び前記出力係止片の外周面は前記ハウジングの内周面に対して摺動可能である、請求項2に記載の双方向トルクリミッタ。
- 前記入力係止片及び前記出力係止片の外周面には軸方向に延びる溝が形成されている、請求項3に記載の双方向トルクリミッタ。
- 前記入力部材は、前記入力係止片が設けられて且つ軸方向に対し垂直な入力板を備えると共に、前記出力部材は、前記出力係止片が設けられて且つ軸方向に対し垂直な出力板を備え、前記入力板及び前記出力板は軸方向に対向して設置される、請求項1乃至4のいずれかに記載の双方向トルクリミッタ。
- 前記入力板には前記内輪の内側に挿通される入力軸が形成されている、請求項5に記載の双方向トルクリミッタ。
- 前記外側コイルばね及び前記内側コイルばねを構成する線材の断面形状は矩形である、請求項1乃至6のいずれかに記載の双方向トルクリミッタ。
- 前記外側コイルばね及び前記内側コイルばねには潤滑剤が塗布されている、請求項1乃至7のいずれかに記載の双方向トルクリミッタ。
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JP2002089592A (ja) * | 2000-09-14 | 2002-03-27 | Origin Electric Co Ltd | クラッチ及びオンオフ機能を備えたトルクリミッタ |
JP2002155973A (ja) | 2000-11-17 | 2002-05-31 | Origin Electric Co Ltd | 双方向トルクリミッタ |
JP2006265982A (ja) | 2005-03-25 | 2006-10-05 | Mitsuba Corp | 車両用自動開閉装置 |
JP2017122489A (ja) * | 2016-01-08 | 2017-07-13 | オリジン電気株式会社 | コイルばねを利用したフリータイプ双方向クラッチ |
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JP2002089592A (ja) * | 2000-09-14 | 2002-03-27 | Origin Electric Co Ltd | クラッチ及びオンオフ機能を備えたトルクリミッタ |
JP2002155973A (ja) | 2000-11-17 | 2002-05-31 | Origin Electric Co Ltd | 双方向トルクリミッタ |
JP2006265982A (ja) | 2005-03-25 | 2006-10-05 | Mitsuba Corp | 車両用自動開閉装置 |
JP2017122489A (ja) * | 2016-01-08 | 2017-07-13 | オリジン電気株式会社 | コイルばねを利用したフリータイプ双方向クラッチ |
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