JP4606921B2 - Rotation transmission device - Google Patents

Description

  The present invention relates to a rotation transmission device used for switching between power transmission and cutoff on a power transmission path.

  In a FR-based four-wheel drive vehicle, a rotation transmission device described in Patent Document 1 is conventionally known as a rotation transmission device that transmits and blocks driving force to front wheels as auxiliary driving wheels.

  The above rotation transmission device incorporates a two-way clutch between an outer ring connected to a propeller shaft and an inner ring connected to a differential pinion shaft, and the engagement and engagement of the two-way clutch by an electromagnetic clutch arranged in parallel with the two-way clutch. The engagement / disengagement is controlled, and the outer ring and the inner ring are coupled by the engagement of the two-way clutch to transmit the rotation of the outer ring to the inner ring.

  Here, the two-way clutch is provided with a cylindrical surface on the inner periphery of the outer ring, and a cam surface is formed on the outer periphery of the inner ring so as to form a wedge-shaped space whose both ends in the circumferential direction are narrow with the cylindrical surface. A roller is incorporated between the surface and the cylindrical surface, and the roller is engaged with the cylindrical surface and the cam surface by the relative rotation of the cage that holds the roller and the inner ring. Further, a switch spring is incorporated between the inner ring and the cage, and the roller is held at a neutral position where the roller is disengaged from the cylindrical surface and the cam surface by the switch spring.

  On the other hand, the electromagnetic clutch is connected to the open end of the outer ring and the armature that is fastened to the retainer via a coupling plate fitted in the open end of the retainer and supported so as to be movable in the axial direction. A rotor that is axially opposed to the armature and an electromagnet disposed opposite the rotor. The armature is attracted to the rotor by energizing the electromagnetic coil of the electromagnet, and the armature and the inner ring coupled to the outer ring are relative to each other. The roller is engaged with the cylindrical surface and the cam surface by rotation.

  In the above-described rotation transmission device that controls the engagement and disengagement of the two-way clutch by the electromagnetic clutch, when the gap formed between the opposed surfaces of the rotor and the armature becomes larger than necessary, the armature is applied to the rotor when the electromagnetic coil is energized. Cannot be adsorbed, and the two-way clutch cannot be controlled, so that it is necessary to strictly manage the gap.

  At this time, in the rotation transmission device described in Patent Document 1, the one end surface of the cage is positioned in the axial direction by a retaining ring attached to the outer diameter surface of the inner ring. Therefore, it is necessary to form an engagement groove in the inner ring, which takes time for processing, and there is a processing tolerance in the engagement groove, and a dimensional tolerance in the retaining ring. There is a problem that there is a large variation in the gap formed between the opposing surfaces of the armature.

Here, as described in Patent Document 2, positioning of one end of the cage by a bearing that relatively rotatably supports the outer ring and the inner ring eliminates the need for grooving and eliminates the retaining ring. Therefore, a great effect can be obtained in suppressing gap variation.
JP 2003-118418 A JP 2005-30443 A

  Incidentally, in the rotation transmission device described in Patent Document 2, as shown in FIG. 6, a retainer 61 is provided outside the inner ring 60, a roller 63 is accommodated in a pocket 62 of the retainer 61, and the inner ring 60 is provided. A retainer for holding a roller 63 when assembling a rotation transmission device in which an inner ring assembly B incorporating a switch spring 64 is inserted into the outer ring and an end of the inner ring 60 is press-fitted into a bearing. There is a possibility that 61 may move in the axial direction and fall off, and there are still points to be improved in improving the assemblability.

  An object of the present invention is to improve the assemblability of a rotation transmission device capable of suppressing gap variation between a rotor and an armature.

  In order to solve the above problems, in the present invention, the inner ring and the cage can be held in an assembled state by a switch spring incorporated between the inner ring and the cage.

That is, in the present invention, the inner ring and the outer ring are relatively rotatably supported by the bearings incorporated between the two rings, the engagement element and the engagement element are held between the inner ring and the outer ring, and the relative rotation with respect to the inner ring is achieved. A cage for engaging the engaging element with the opposing surfaces of the inner ring and the outer ring, and positioning one end of the cage in the axial direction by the bearing, and providing a notch at the other end of the cage. It has a pair of pressing pieces to be inserted into the notches, and the engaging pieces are disengaged from the opposing surfaces of the inner and outer rings by pressing the opposing sides in the circumferential direction of the notches in the opposite direction. A switch spring that elastically holds the cage in a neutral position is supported by the inner ring in a non-movable manner in the axial direction, is prevented from rotating by the cage, and is positioned in the axial direction by the other end of the cage. B A rotation transmission device that controls the rotation of the cage by attracting the armature to the rotor by energizing the electromagnetic coil of an electromagnet that faces the rotor in the axial direction. A narrow portion for preventing the pair of pressing pieces from coming off is provided at the opening end of the notch formed at the other end, and the inner ring and the cage are assembled by the switch spring supported non-movably in the axial direction by the inner ring. A configuration that can be maintained in a state is adopted.

  As described above, the pressing pieces at both ends of the switch spring supported non-movably in the axial direction by the inner ring are inserted into the notch provided at the other end of the cage, and a narrow portion is provided at the opening end of the notch. By preventing the pair of pressing pieces from coming off, the switch spring can prevent the inner ring and the cage provided on the outer side thereof from moving relative to each other in the axial direction, thereby improving the assembly of the rotation transmission device. Can be planned.

  In addition, since one end of the cage is positioned by the bearing, variation in the gap formed between the opposing surfaces of the rotor and the armature can be suppressed, and the rotation of the cage can be reliably controlled by energizing the electromagnetic coil. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the inner ring 1 has a large-diameter portion 2, and an outer ring 3 is provided outside the large-diameter portion 2, and the outer ring 3 and the inner ring 1 are assembled at one end portion between both wheels. The bearing 4 is rotatably supported.

  A two-way clutch 10 is incorporated between the inner ring 1 and the outer ring 3. The two-way clutch 10 forms a cylindrical surface 11 on the inner periphery of the outer ring 3, and forms a narrow wedge-shaped space at both ends in the circumferential direction with the cylindrical surface 11 on the outer periphery of the large-diameter portion 2 of the inner ring 1. A plurality of cam surfaces 12 are provided at equal intervals in the circumferential direction, a roller 13 as an engaging member is incorporated between each cam surface 12 and the cylindrical surface 11, and the roller 13 is held by a cage 14. It consists of a direction clutch.

  Here, the cage 14 has a small-diameter cylindrical portion 14 a at one end, the small-diameter cylindrical portion 14 a is fitted to one end of the inner ring 1, and one end thereof is positioned in the axial direction by the bearing 4.

  A spring housing recess 15 is formed on the other end surface of the large diameter portion 2 of the inner ring 1, and a switch spring 16 is incorporated in the spring housing recess 15. The switch spring 16 has a C shape, and a pair of pressing pieces 16a facing outward in the radial direction are provided at both ends thereof. The pair of pressing pieces 16 a is inserted into a notch 18 provided at the other end of the retainer 14 from a notch 17 formed in the outer peripheral wall of the spring housing recess 15, and the periphery of the notch 17 and the notch 18. The retainer 14 is elastically held at a neutral position where the opposite side surfaces are pressed in opposite directions and the roller 13 is disengaged from the cylindrical surface 11 and the cam surface 12 by the pressing.

  Between the outer ring 3 and the cage 14, an electromagnetic clutch 20 that controls engagement and disengagement of the two-way clutch 10 is provided in parallel with the two-way clutch 10.

  The electromagnetic clutch 20 is incorporated in an armature 21 disposed opposite to the other end of the cage 14, a rotor guide 22 covering the armature 21, and an opening end portion of the rotor guide 22, and faces the armature 21 in the axial direction. The rotor 23 includes an electromagnet 24 that is disposed to face the rotor 23 in the axial direction.

  The armature 21 is supported with respect to the retainer 14 so as to be movable in the axial direction. When supporting the armature 21, here, the connecting plate 25 is fitted into the other end of the retainer 14, and an L-shaped engaging piece 26 formed at a position opposite to the outer periphery of the connecting plate 25 is attached to the retainer 14. The connecting plate 25 is prevented from rotating by fitting into the notch 27 formed, the engaging piece 26 is inserted into the engaging hole 28 provided in the armature 21, the armature 21 is prevented from rotating, and the axial direction Can move freely.

  The connecting plate 25 is fitted to the other end portion of the inner ring 1 and abutted against the other end surface of the large diameter portion 2, and is attached to the other end surface of the large diameter portion 2 by a retaining ring 29 attached to the outer periphery of the other end portion of the inner ring 1. It is held in a state of collision. The switch plate 16 is supported by the connecting plate 25 so as not to move in the axial direction.

  A separation spring 30 is incorporated between the facing surfaces of the armature 21 and the rotor 23, and the separation spring 30 presses the armature 21 in a direction away from the rotor 23.

  The rotor guide 22 is made of a nonmagnetic material. The rotor guide 22 is fitted to the outer periphery of the opening end portion of the outer ring 3, and is positioned in the axial direction by an abutment of one side surface of the annular protrusion 22 a formed on the inner periphery thereof and the opening end of the outer ring 3. Further, a notch 31 is formed at one end of the rotor guide 22, and the rotor guide 22 is prevented from rotating by the engagement of the notch 31 and a protrusion 32 provided on the outer periphery of the open end of the outer ring 3.

  Further, a circumferential groove 33 is formed on the outer periphery of one end portion of the rotor guide 22, and the rotor guide 22 is prevented from coming off by engagement between a retaining ring 34 attached to the circumferential groove 33 and the protrusion 32.

  The rotor 23 has an outer cylinder portion 23a and an inner cylinder portion 23b facing in the same direction on the outer circumference and the inner circumference, and the outer cylinder portion 23a is fitted inside the other end portion of the rotor guide 22, and one end thereof and an annular projecting portion The rotor is positioned by the engagement of the other end face of 22a in the axial direction and the engagement between the projection 35 provided on the outer periphery of the other end of the outer cylinder 23a and the notch 36 formed at the other end of the rotor guide 22. 23 is prevented from rotating.

  The rotor 23 is prevented from coming off by a retaining ring 37 attached to the inner periphery of the other end of the rotor guide 22.

  The electromagnet 24 is incorporated between the outer cylinder portion 23 a and the inner cylinder portion 23 b of the rotor 23. The electromagnet 24 has an electromagnetic coil 24 a and a core 24 b that supports the electromagnetic coil 24 a, and the core 24 b is supported by a stationary member 38.

  As shown in FIG. 3, a narrow portion 40 is provided at the opening end of the notch 18 formed at the other end of the cage 14 to prevent the pair of pressing pieces 16 a from coming off. Here, when the narrow portion 40 is formed, the protruding portion 41 is formed inwardly at the opening end portion of the notch 18, but the invention is not limited thereto. For example, as shown in FIG. 5, a tapered surface 42 that is inclined toward opposite directions may be provided on both sides facing each other in the circumferential direction of the notch 18.

  The rotation transmission device shown in the embodiment has the above-described structure, and an input shaft is connected to the outer ring 3, while an output shaft is connected to the inner ring 1. In order to connect the input shaft and the output shaft, spline teeth 51 and 52 are provided on the inner periphery of one end of the outer ring 3 and the inner periphery of the inner ring 1.

  1 and 2 show a state in which the electromagnetic coil 24a of the electromagnet 24 is de-energized, and the roller 13 of the two-way clutch 10 is engaged with the cylindrical surface 11 and the cam surface 12 by the elastic force of the switch spring 16. It is held in the neutral position that has been released. For this reason, even if the outer ring 3 rotates, the rotation is not transmitted to the inner ring 1 and only the outer ring 3 rotates freely.

  When the electromagnetic coil 24a of the electromagnet 24 is energized while the outer ring 3 is rotating, the armature 21 is attracted to the rotor 23, and the armature 21 and the outer ring 3 are coupled. At this time, since the armature 21 is prevented from rotating by the retainer 14, the retainer 14 rotates together with the outer ring 3 and rotates relative to the inner ring 1. The roller 13 is engaged with the cylindrical surface 11 and the cam surface 12 by the relative rotation, and the rotation of the outer ring 3 is transmitted to the inner ring 1 through the roller 13.

  When the cage 14 rotates relative to the inner ring 1, the switch spring 16 is elastically deformed. For this reason, when the energization of the electromagnetic coil 24 a is interrupted, the cage 14 is rotated by the restoring elasticity of the switch spring 16, and the roller 13 is in a neutral position where the engagement with the cylindrical surface 11 and the cam surface 12 is released. The rotation transmission from the outer ring 3 to the inner ring 1 is interrupted.

  When assembling the rotation transmitting device as described above, after assembling the inner ring assembly A shown in FIGS. 4 (I) and (II), the inner ring assembly A is inserted into the outer ring 3 and one end of the inner ring is connected to one end of the outer ring 3. It press-fits into the bearing 4 previously incorporated in the part.

  Here, the inner ring assembly A is provided with a retainer 14 on the outer side of the inner ring 1, holds the roller 13 by the retainer 14, and notches a pair of pressing pieces 16 a of the switch spring 16 incorporated in the spring housing recess 15. The connecting plate 25 is inserted into the notch 18 of the retainer 14 from the portion 17, the connecting plate 25 fitted to the other end of the inner ring 1 is brought into contact with the other end of the large-diameter portion 2, and the connecting plate 25 is attached by attaching the retaining ring 29. It has been secured.

  In the inner ring assembly A, the switch spring 16 is prevented from coming off by the connecting plate 25, and the pair of pressing pieces 16 a of the switch spring 16 is prevented from coming off by the narrow portion 40 provided in the opening of the notch 18. 1 and the cage 14 do not move relative to each other in the axial direction, and the inner ring assembly A is held in the assembled state by the switch spring 16. For this reason, the inner ring assembly A can be easily assembled to the inner side of the outer ring 3, and the assemblability can be improved.

  Further, in the assembled state of the inner ring assembly A, as shown in FIG. 1, since one end of the retainer 14 is positioned by the bearing 4, there is a variation in the gap g formed between the facing surfaces of the armature 21 and the rotor 23. The two-way clutch 10 can be reliably controlled by the electromagnetic clutch 20.

  In the embodiment, the two-way clutch 10 is a roller type, but the two-way clutch 10 is not limited to this. For example, a sprag type two-way clutch using a sprag as an engagement element may be used. In the case of a sprag type two-way clutch, a cylindrical surface is formed on the inner periphery of the outer ring and the outer periphery of the inner ring, a sprag is incorporated between the cylindrical surfaces, and the sprag is held by two cages having different diameters. The retainer on the side is fixed to the inner ring, and the pressing pieces at both ends of the switch spring held by the inner ring are inserted into the notch provided at the other end of the large-diameter side retainer to engage the sprag with the cylindrical surface. It holds in the neutral position where it is released, and a narrow portion is provided at the opening end of the notch to prevent the pair of pressing pieces from coming off. Further, the large-diameter side retainer is coupled to or disconnected from the outer ring by an electromagnetic clutch.

A longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Sectional view along the line II-II in FIG. Sectional view viewed from line III-III in FIG. (I) is a front view showing the inner ring assembly, (II) is a longitudinal side view of (I). Front view showing another example of inner ring assembly Longitudinal side view showing a conventional inner ring assembly

Explanation of symbols

1 Inner ring 3 Outer ring 4 Bearing 13 Roller (engagement element)
14 Cage 16 Switch spring 16a Pressing piece 18 Notch 21 Armature 23 Rotor 24 Electromagnet 24a Electromagnetic coil 40 Narrow part

Claims (1)

An inner ring and an outer ring are supported relatively rotatably by a bearing incorporated between the two rings, an engagement element is held between the inner ring and the outer ring, and the engagement element is held, and the engagement element is connected to the inner ring by relative rotation with respect to the inner ring. A pair of cages to be engaged with the opposing surface of the outer ring, one end of the cage is axially positioned by the bearing, a notch is provided at the other end of the cage, and a pair inserted into the notch The retainer is in a neutral position where the engaging pieces are released from the opposing surfaces of the inner and outer rings by pressing the opposite side surfaces in the circumferential direction of the notches with the pressing pieces in the opposite direction. A switch spring that elastically holds the armature is supported by the inner ring in a non-movable manner in the axial direction. Facing in the axial direction In the rotation transmitting device designed to control the rotation of the cage by adsorbing the armature to the rotor by energizing to the electromagnetic coil of the electromagnet which faces in the axial direction data,
A narrow portion for preventing the pair of pressing pieces from coming off is provided at the opening end of the notch formed at the other end of the cage, and the inner ring is held by the switch spring supported non-movably in the axial direction by the inner ring. A rotation transmission device characterized in that the container can be held in an assembled state .

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