JP2017150532A - Rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation transmission device capable of improving a magnetic attraction force against an armature and stabilizing the attraction force.SOLUTION: There is provided an electromagnetic clutch 40 for controlling an engagement, disengagement of a two-way clutch 10 while being arranged side-by-side to the two-way clutch 10 configured in such a way that a cage 14 is assembled between an inner ring 12 arranged at a shaft end part of a first shaft Sand an outer ring 11 arranged at a shaft end part of a second shaft part Sand rollers 13 held by the cage 14 are engaged with the inner periphery of the outer ring 11 and the outer periphery of the inner ring 12 under a relative rotation of the cage 14 in respect to the inner ring 12. The electromagnet clutch 40 is configured by an armature 41 stopped in rotation against the cage 14 and movably supported in an axial direction of the first shaft Sand an electromagnet 44 rotatably supported around a center of the first shaft Sand oppositely against the armature 41 in an axial direction. The armature 41 is directly attracted in magnetic manner by the electromagnet 44 through electrical energization against the electromagnet 44 to improve magnetic attraction force and stabilize the attracting force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotation transmission device used for switching between transmission and cutoff of rotation between two axes arranged on the same axis.

  As a rotation transmission device that arranges the first axis and the second axis on the same axis and transmits and blocks rotation between the two axes, the one described in Patent Document 1 below has been conventionally known. Yes.

  The rotation transmission device described in Patent Document 1 includes a two-way clutch and an electromagnetic clutch that controls engagement and release of the two-way clutch. The two-way clutch incorporates an inner ring inside the outer ring, and forms a wedge space narrowing toward both ends in the circumferential direction between the inner ring and the cylindrical surface formed on the inner periphery of the outer ring. These cam surfaces are formed, and an engaging member made of a roller is incorporated between each cam surface and the cylindrical surface, and the engaging member is held by a cage.

  Further, a switch spring is incorporated between the cage and the inner ring, and the cage is held in a neutral position where the engagement element is disengaged from the cylindrical surface and the cam surface by the elasticity of the switch spring.

  On the other hand, the electromagnetic clutch is provided with an armature facing the opening end of the outer ring, the rotor connected to the outer ring is opposed to the armature, an electromagnet is provided facing the rotor, and the armature is attached to the rotor by energizing the electromagnet. Adsorb and connect the cage to the outer ring, and the relative rotation between the cage and the inner ring causes the engagement element to engage the cylindrical surface of the outer ring and the cam surface of the inner ring, thereby transmitting rotational torque between the inner ring and the outer ring. doing.

JP 2007-247713 A

  By the way, in the conventional rotation transmission device, the rotor forming the electromagnetic clutch has a U-shaped cross section and has an outer cylinder part and an inner cylinder part, and an electromagnet is incorporated between the outer cylinder part and the inner cylinder part. Since the air gap is formed in the radial direction and the axial direction between the electromagnet and the rotor, the magnetic force generated by the electromagnet is lost and the generated magnetic force is not transmitted to the rotor 100%, and the magnetic attractive force against the armature There are still points to be improved in improving

  In addition, the air gap between the electromagnet and the rotor changes due to dimensional tolerances, resulting in variations in the attractive force, and there is still a point to be improved in order to stabilize the attractive force.

  An object of the present invention is to provide a rotation transmission device capable of improving the magnetic attraction force for an armature and stabilizing the attraction force.

  In order to solve the above-described problems, in the present invention, a two-way clutch for coupling and releasing a first shaft and a second shaft arranged on the same axis, and an electromagnetic clutch for controlling engagement and release of the two-way clutch The two-way clutch is an inner ring provided at the shaft end of the first shaft, an outer ring provided at the shaft end of the second shaft, and a holding unit incorporated between the outer ring and the inner ring. , A retainer held by the retainer, and engaged with the inner periphery of the outer ring and the outer periphery of the inner ring by relative rotation of the retainer with respect to the inner ring, and elastically deformed by relative rotation of the retainer with respect to the first shaft and restored In a rotation transmission device comprising a switch spring for returning and rotating the retainer to a neutral position where the engagement element is disengaged by elasticity, the electromagnetic clutch is prevented from rotating with respect to the retainer, and the shaft of the first shaft Supported in a freely movable direction The armature is composed of an electromagnet that is rotatably supported around the first axis and faces the armature in the axial direction. When the electromagnet is energized, the armature is directly magnetically attracted by the electromagnet. .

  As described above, by directly attracting the armature with the electromagnet, the loss of the magnetic attraction generated by the electromagnet is small, and the magnetic attraction force is reduced compared to the conventional electromagnetic clutch that magnetically attracts the armature through the rotor. Can be increased.

  Further, since the air gap is formed only between the electromagnet and the armature, variation in the size of the air gap can be suppressed, and the magnetic attractive force can be stabilized.

  Here, the electromagnet has a U-shaped core having an inner cylindrical portion and an outer cylindrical portion, and an electromagnetic coil held by the core, and the end surfaces of the inner cylindrical portion and the outer cylindrical portion of the core are armatures. It is preferable that the electromagnets are assembled so as to face each other, and the areas of the suction end faces for magnetically attracting the armatures of the inner cylinder part and the outer cylinder part are the same.

  By adopting the above configuration, the armature can be reliably magnetically attracted, and the two-way clutch can be reliably controlled.

  Further, it is preferable that one end of a cylinder made of a non-magnetic material is connected to the outer ring, and the electromagnet is supported by the other end of the cylinder.

  As described above, the two-way clutch and the electromagnetic clutch can be unitized by connecting the electromagnet to the outer ring by the cylindrical body made of a non-magnetic material, and the assembly to the power transmission system can be facilitated. it can.

  Furthermore, it is preferable to incorporate a bearing between the first shaft and the electromagnet to rotatably support the electromagnet.

  By adopting the above configuration, it is possible to stabilize the support of the electromagnet, and to form an air gap having a uniform size over the entire circumferential direction between the opposed portions of the electromagnet and the armature. A suction force can be applied.

  In the present invention, as described above, since the armature is directly magnetically attracted by the electromagnet, the magnetic attraction force to the armature can be increased and the magnetic force can be increased compared to the electromagnetic clutch that magnetically attracts the armature via the rotor. The suction force can be stabilized.

  Further, the number of parts can be reduced by the amount that the rotor can be dispensed with, and the cost can be reduced and the rotation transmission device can be reduced in size.

A longitudinal sectional view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows the electromagnetic clutch part of FIG. Sectional view along line III-III in FIG. Sectional view showing armature adsorption state

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a rotation transmission device according to the present invention. As shown, the rotation transmission device includes a first axis S _1, the second axis S ₂ disposed on the first shaft S ₁ and coaxially from the first shaft S ₁ to the second shaft S ₂ It comprises a two-way clutch 10 that transmits and shuts off rotation and an electromagnetic clutch 40 that controls engagement and release of the two-way clutch 10.

Electromagnetic clutch 40 is arranged in two directions clutch 10 provided on a first axis S _1, their two-way clutch 10 and the electromagnetic clutch 40 is covered by a cylindrical housing 1.

The first shaft S ₁ has a shaft end portion inserted into a shaft insertion hole 3 formed in the end wall 2 of the housing 1, and is rotatably supported by a bearing 4 incorporated in the shaft insertion hole 3.

As shown in FIGS. 1 to 3, the two-way clutch 10, the inside of the second shaft S and the outer ring 11 provided on the shaft end of the _2, the first shaft is provided on the shaft end of the S ₁ the outer ring 11 An inner ring 12 incorporated in the inner ring 12, a roller 13 as an engaging element incorporated between opposing portions of the inner ring 12 and the outer ring 11, and a cage 14 that holds the roller 13.

The outer ring 11, the second axis S ₂ and has been integrated integrally provided on the second shaft S _2, as the second axis S ₂ and separately, first as fitting by the fitting or spline by serration it may be integrated with two-axis _{S 2.}

  The outer ring 11 is rotatably supported by a bearing 15 incorporated in the opening at the other end of the housing 1 and is non-movable in the axial direction. The outer ring 11 and the inner periphery of the other end of the housing 1 are not supported. The seal member 16 is hermetically sealed.

On the other hand, the inner ring 12 rotates together with the first shaft _{S 1} is integrated with the first axis _{S 1.} Here, when the inner ring 12 is integrated with the first shaft S _{1, the} fitting is performed by the serration 17, but it may be integrated by a spline or may be keyed.

The inner ring 12 is provided with small-diameter cylindrical portions 18 a and 18 b at both ends in the axial direction, and the other small-diameter cylindrical portion 18 b facing the second shaft S ₂ is attached to the outer ring 11 by a bearing 19 incorporated inside the outer ring 11. On the other hand, it is supported relatively rotatably.

  A plurality of flat cam surfaces 21 forming a wedge space in which both ends in the circumferential direction are narrowed between the inner ring 12 and the cylindrical surface 20 formed on the inner circumference of the outer ring 11 are equally spaced in the circumferential direction. A roller 13 is formed between each cam surface 21 and the cylindrical surface 20.

The cage 14 is provided with an inward flange 22 at the other end facing the second shaft S _2, and the flange 22 is rotatably fitted to the small-diameter cylindrical portion 18 b at the other end of the inner ring 12. . Further, the flange 22 is positioned in the axial direction by a retaining ring 23 attached to the other end surface of the inner ring 12 and the outer periphery of the small-diameter cylindrical portion 18b.

The cage 14 is formed with a pocket 24 at a position facing the cam surface 21 of the inner ring 12 in the radial direction, and the roller 13 is accommodated in the pocket 24. Roller 13, when the retainer 14 relative to the inner ring 12 are relatively rotated, engages the cylindrical surface 20 and cam surface 21, transmitting rotational torque between the first shaft S ₁ and the second axis S ₂ mutually To do.

  On the small-diameter cylindrical portion 18a at one end of the inner ring 12, a switch spring 25 that elastically holds the cage 14 in a neutral position where the roller 13 is disengaged from the cylindrical surface 20 and the cam surface 21, and the switch spring 25 is a small-diameter cylinder. A spring retaining ring 29 is provided for preventing the end from the end of the portion 18a.

  As shown in FIG. 3, the switch spring 25 has a configuration in which a pair of engagement pieces 25 b are provided outward at both ends of a ring portion 25 a having a separation end at a part in the circumferential direction. The switch spring 25 is fitted into a circular recess 26 formed on one end face of the inner ring 12 with the ring portion 25a fitted on the outer diameter surface of the small-diameter cylindrical portion 18a, and the pair of engagement pieces 25b has the circular shape. It is incorporated into a notch 28 formed at one end of the retainer 14 from a notch 27 formed on the outer peripheral wall of the recess 26.

  By incorporating the switch spring 25 as described above, the pair of engagement pieces 25b press the opposite ends in the circumferential direction of the notch 27 and the notch 28 in opposite directions. By the pressing, the retainer 14 is elastically held at a neutral position where the roller 13 is disengaged from the cylindrical surface 20 and the cam surface 21.

  The spring retaining ring 29 is fitted into the small-diameter cylindrical portion 18a of the inner ring 12 and one end of the retainer 14, and the end side of the small-diameter cylindrical portion 18a is attached by a retaining ring 30 attached to the outer diameter surface of the small-diameter cylindrical portion 18a. And the spring retaining ring 29 prevents the switch spring 25 from coming out of the circular recess 26.

  As shown in FIGS. 1 and 2, the electromagnetic clutch 40 includes an armature 41 and an electromagnet 44 that faces the armature 41 in the axial direction.

  The armature 41 is slidably fitted to the small-diameter cylindrical portion 18a at one end of the inner ring 12, and faces the opening end surface of the outer ring 11 in the axial direction. The armature 41 is prevented from rotating with respect to the retainer 14. Here, when the armature 41 is prevented from rotating, a projecting piece portion 42 is provided at one end of the retainer 14, and the projecting piece portion 42 is slidably fitted into a detent hole 43 formed in the armature 41.

The electromagnet 44 includes a core 45 made of a magnetic material and an electromagnetic coil 46 held by the core 45. The core 45 is U-shaped in cross section, and has an inner cylinder part 45a and an outer cylinder part 45b. The inner cylinder 45a and the outer cylinder part 45b are incorporated so that the end faces thereof face the armature 41. It is relatively rotatably supported to the first axis S ₁ by parts 45a and the bearing 58 incorporated between the first axis S _1.

  The core 45 is connected to the outer ring 11 of the two-way clutch 10 via a cylindrical body 47 made of a nonmagnetic material, and rotates integrally with the outer ring 11.

  Here, the outer ring 11 and the cylinder 47 are connected by providing a projection 48 on the outer diameter surface of the outer ring 11 on the opening end side, and fitting the projection 48 into a notch 49 that opens on the other end surface of the cylinder 47. The protrusion 48 is retained by a retaining ring 50 attached to the outer diameter surface of the cylindrical body 47.

  On the other hand, the core 45 and the cylinder 47 are connected by providing a protrusion 51 on the outer diameter surface of one end of the outer cylinder 45 b fitted into one end of the cylinder 47. The protrusion 51 is prevented from being pulled out by a retaining ring 53 fitted to the opening notch 52 and attached to the inner surface of one end of the cylindrical body 47.

  As shown in FIG. 2, a connector 54 to which an electric supply wire is connected is attached to the end wall 2 of the housing 1, and each of a pair of brushes 55 provided on the connector 54 is provided on the end surface of the core 45. The pair of annular contacts 56 are in contact with each other, and electricity is supplied to the electromagnetic coil 46 through the brush 55 and the contacts 56, and the armature 41 is energized to the inner coil portion of the core 45 in the electromagnet 44. 45a and the outer cylinder part 45b are magnetically attracted directly to the end faces.

  An elastic member 57 is incorporated between the inner cylinder portion 45 a of the core 45 and the facing portion of the armature 41, and the armature 41 is urged by the elastic member 57 in a direction away from the core 45.

  Here, the area of the suction end face that magnetically attracts the armature 41 of the inner cylinder part 45a is the same as the area of the suction end face that magnetically attracts the armature 41 of the outer cylinder part 45b.

  The rotation transmission device shown in the embodiment has the above-described structure, and FIG. 1 shows a cut-off state of energization to the electromagnetic coil 46 in the electromagnetic clutch 40, and the roller 13 in the two-way clutch 10 is as shown in FIG. The two-way clutch 10 is in a disengaged state while being held in a neutral position for disengaging the cylindrical surface 20 of the outer ring 11 and the cam surface 21 of the inner ring 12.

Here, the rotation transmission device may use either the first axis S ₁ or the second axis S ₂ shown in FIG. 1 as an input shaft. In case of using the first shaft S ₁ as an input shaft, the two-way clutch 10 is first shaft S ₁ in a state which is disengaged is rotated, the rotation is not transmitted to the second shaft S _2, the uniaxially _{S 1} and the inner ring 12 is free rotation.

  At this time, the rotation of the inner ring 12 is transmitted to the cage 14 via the switch spring 25, and the cage 14 and the roller 13 rotate together. Further, since the armature 41 is prevented from rotating by the retainer 14, the armature 41 also rotates.

In the free rotation state of the first shaft S _1, when energized electromagnetic coil 46 of the electromagnetic clutch 40 shown in FIG. 1, the armature 41 is magnetically attracted to the core 45 of the electromagnet 44, as shown in FIG. 4, the core 45 It is attracted to the end surfaces of the inner cylinder part 45a and the outer cylinder part 45b.

  Since the core 45 is connected to the outer ring 11 via the cylindrical body 47, the retainer 14 is connected to the outer ring 11 by the adsorption of the armature 41, and the retainer 14 and the inner ring 12 rotate relative to each other.

3 is engaged with the cylindrical surface 20 of the outer ring 11 and the cam surface 21 of the inner ring 12 by the relative rotation of the cage 14 and the inner ring 12, and the two-way clutch 10 is engaged, and the rotation of the inner ring 12 is performed. There is transmitted to the outer ring 11, the second axis S ₂ is rotated.

  Here, when the cage 14 and the inner ring 12 rotate relative to each other, the positions of the notch 27 and the notch 28 shown in FIG. 3 are shifted in the circumferential direction, and the ring portion 25a of the switch spring 25 is elastically deformed to reduce its diameter.

For this reason, when the energization to the electromagnetic coil 46 shown in FIG. 1 is released, the retainer 14 is returned and rotated by the restoring elasticity of the switch spring 25 and returned to the neutral position where the roller 13 is disengaged. Disengage. Transmission of rotational torque from the first shaft S ₁ to the second shaft S ₂ is blocked by the disengagement.

When using the second axis S ₂ shown in FIG. 1 as an input shaft, in the 2-way clutch 10 is disengaged, the second axis S ₂ is rotated, the second shaft S ₂ and the outer ring 11, cylinder Both the body 47 and the electromagnet 44 rotate freely.

In the rotational state of the second axis S _2, when energized electromagnetic coil 46, as shown in FIG. 4, in the same manner as described above, the armature 41 is attracted to the end face of the inner cylindrical portion 45a and the outer cylinder portion 45b of the core 45, The retainer 14 is coupled to the outer ring 11 via the armature 41 and the cylindrical body 47, and the inner ring 12 and the retainer 14 rotate relative to each other. By its relative rotation, the roller 13 engages the cam surface 21 of the cylindrical surface 20 and inner ring 12 of the outer ring 11, two-way clutch 10 is engaged, the rotation of the second shaft S ₂ is the first axis S ₁ Communicated.

  As shown in the embodiment, the armature 41 is directly magnetically attracted by the end surfaces of the inner cylinder portion 45a and the outer cylinder portion 45b of the core 45 forming the electromagnet 44, so that the rotor is incorporated between the electromagnet and the armature. Compared with an electromagnetic clutch that magnetically attracts the armature with the rotor, the magnetic attraction force with respect to the armature 41 can be increased.

  Further, since an air gap is formed only between the end surfaces of the inner cylinder portion 45a and the outer cylinder portion 45b of the core 45 forming the electromagnet 44 and the armature 41, variation in the size of the air gap can be suppressed, and magnetic attraction can be suppressed. The power can be stabilized.

  Further, the number of parts can be reduced by the amount that the rotor can be dispensed with, and the cost can be reduced and the rotation transmission device can be reduced in size.

  As shown in FIG. 1, one end of a non-magnetic cylinder 47 is connected to the outer ring 11 of the two-way clutch 10, and the electromagnet 44 is supported by the other end of the cylinder 47, thereby 10 and the electromagnetic clutch 40 are unitized, and the assembly of the two-way clutch 10 and the electromagnetic clutch 40 into the housing 1 can be facilitated.

Further, by incorporating a bearing 58 between the first shaft S ₁ and the electromagnet 44 to support the electromagnet 44 rotatably, the support of the electromagnet 44 is stabilized, and the electromagnet 44 and the armature 41 are opposed to each other. An air gap having a uniform size can be formed over the entire circumferential direction. As a result, a uniform suction force can be applied over the entire circumferential direction of the armature 41.

S ₁ First shaft S ₂ Second shaft 10 Two-way clutch 11 Outer ring 12 Inner ring 13 Roller (engagement element)
14 Cage 25 Switch Spring 40 Electromagnetic Clutch 41 Armature 44 Electromagnet 45 Core 45a Inner Cylinder 45b Outer Cylinder 46 Electromagnetic Coil 47 Cylinder 58 Bearing

Claims (4)

A two-way clutch for coupling and releasing the first shaft and the second shaft arranged on the same axis; and an electromagnetic clutch for controlling engagement and release of the two-way clutch, wherein the two-way clutch is the first clutch An inner ring provided at the shaft end of the shaft, an outer ring provided at the shaft end of the second shaft, a cage built between the outer ring and the inner ring, and held by the cage to be held against the inner ring. An engaging element that engages with the inner circumference of the outer ring and the outer circumference of the inner ring by relative rotation of the cage, and elastically deforms by relative rotation of the cage with respect to the first shaft, and is in a neutral position where the engaging element is disengaged by its restoring elasticity. In a rotation transmission device comprising a switch spring for rotating the cage back,
The electromagnetic clutch is supported with respect to the retainer so as to be movable in the axial direction of the first shaft, and is supported rotatably about the first shaft in the axial direction with the armature. A rotation transmission device comprising an opposing electromagnet, wherein when the electromagnet is energized, the electromagnet directly magnetically attracts the armature.   The electromagnet includes a U-shaped core having an inner cylindrical portion and an outer cylindrical portion, and an electromagnetic coil held by the core, and the end surfaces of the inner cylindrical portion and the outer cylindrical portion of the core are the armature and The rotation transmission device according to claim 1, wherein electromagnets are assembled so as to face each other, and the areas of the suction end faces that magnetically attract the armature of the inner cylinder part and the outer cylinder part are the same.   The rotation transmission device according to claim 1 or 2, wherein one end portion of a cylindrical body made of a nonmagnetic material is connected to the outer ring, and the electromagnet is supported by the other end portion of the cylindrical body.   The rotation transmission device according to any one of claims 1 to 3, wherein a bearing is incorporated between the first shaft and the electromagnet so as to rotatably support the electromagnet.

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