JP2011220405A - Connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device that can suppress a clutch member from moving to a connecting position while it is not being operated.SOLUTION: The connecting device includes a first connecting member 11 and a second connecting member 12. The first connecting member 11 has a fixed side cam 13 attached to a rotation axis 2; a movable side cam 14 provided to be movable between a connecting position contacting with the second connecting member 12 and a releasing position contacting with the fixed side cam 13; and a cam ball 19 existing between the fixed side cam 13 and the movable side cam 14. In the connecting device 10A, a coil 24 is provided that can generate a magnetic force with strength, by which a movable side cam 14 is moved to the connecting position in the second connecting member 12, and a permanent magnet 15 that generates a magnetic force between the fixed side cam 13 and the movable side cam 14 so that the movable side cam is moved to the releasing position in the fixed side cam 13.

Description

  The present invention includes a first engagement member having a fixing member and a clutch member, and a second engagement member, and is separated from an engagement position where the clutch member contacts the second engagement member and the second engagement member. In addition, the present invention relates to an engagement device that is moved between a release position in contact with the fixing member and switches a power transmission state between a first engagement member and a second engagement member.

  2. Description of the Related Art A clutch device is known that includes an engagement member on an input side and an engagement member on an output side, and the engagement members are connected to each other when a clutch member provided therebetween comes into contact with the engagement member on the output side. ing. As such a clutch device, one having a cam mechanism for increasing the engagement force between the clutch member and the output-side engagement member is known. In such a clutch device, in order to prevent the clutch member from coming into contact with the output-side engagement member during non-operation, a cone clutch is constituted by the taper surface of the clutch member and the taper surface of the input-side member, and the return There is known one in which the tapered surfaces of the cone clutch are engaged with each other by the action of a spring to restrict the relative rotation between the clutch member and the input side member (see Patent Document 1). In addition, there is Patent Document 2 as a prior art document related to the present invention.

JP 2004-060863 A JP 2000-356228 A

  In the apparatus of Patent Document 1, the tapered surfaces of the input side member and the clutch member are brought into contact with each other by a return spring, and the relative rotation between the clutch member and the input side member is restricted by the friction between them. In this case, if the tapered surfaces are separated from each other by vibration or the like, the relative rotation between the clutch member and the input side member cannot be restricted. For this reason, even when the actuator is not in operation, the clutch member may move to an engagement position where the clutch member contacts the output side member, and the input side member and the output side member may be coupled.

  Then, an object of this invention is to provide the engagement apparatus which can suppress that a clutch member moves to an engagement position at the time of non-operation.

  The engagement device of the present invention includes a first engagement member and a second engagement member that are provided so as to be relatively rotatable around a common axis, and the first engagement member is attached to a power transmission target. A fixing member made of a magnetic material, and disposed between the fixing member and the second engaging member, and is separated from the second engaging member and an engaging position that contacts the second engaging member, and the fixing member A clutch member made of a magnetic material provided so as to be movable between a release position in contact with the fixing member, and the fixing member and the clutch member so that power is transmitted between the fixing member and the clutch member The second engagement member is provided with a coil capable of generating a magnetic force with a strength to move the clutch member to the engagement position. In the device, the fixing member and the clutch member Ku even in either the magnetic force generating means for generating a magnetic force between the fixing member and the clutch member so that the clutch member is moved to said release position is provided (claim 1).

  According to the engagement device of the present invention, the clutch member can be moved to the release position by the magnetic force generated by the magnetic force generating means. Therefore, even when the clutch member is separated from the fixed member due to vibration or the like during non-operation, the clutch member can be returned to the released position by the magnetic force of the magnetic force generating means. Therefore, it can suppress that a clutch member moves to an engagement position at the time of non-operation. Thereby, it can suppress that a fixing member and a 2nd engagement member are connected at the time of non-operation.

  In one form of the engagement device of the present invention, the magnetic force generating means may be the clutch member made of a ferromagnetic material. As is well known, a ferromagnetic material is magnetized by a magnetic field applied from the outside, and then remains magnetized even when the magnetic field is removed. In this embodiment, since the clutch member is made of this ferromagnetic material, the clutch member at the engagement position can be magnetized by the magnetic force generated from the coil during excitation, and the clutch member itself can be made into a magnet. In this case, since it is not necessary to separately provide a member that generates a magnetic force such as a magnet in the fixing member or the clutch member, the number of parts constituting the engaging device can be reduced. Therefore, cost can be reduced.

  In one form of the engagement device of the present invention, the fixed member side friction having a larger coefficient of friction than the material forming the fixed member is formed on the fixed member side engaging surface of the fixed member that is in contact with the clutch member. A member may be provided (Claim 3). Moreover, in one form of the engagement device of the present invention, a clutch member having a friction coefficient larger than that of the material forming the clutch member on the clutch member-side engagement surface that comes into contact with the fixed member among the clutch members. A side friction member may be provided (claim 4). Thus, by providing the friction member on at least one of the fixing member and the clutch member, relative rotation of these members when the fixing member and the clutch member are in contact can be suppressed.

  In one form of the engagement device of the present invention, the interposition member may be composed of a magnet. In this case, the clutch member can be pulled toward the fixed member side by utilizing the magnetic force of the interposition member. Therefore, it is possible to further suppress the movement of the clutch member to the engagement position during non-operation.

  In one mode of the engagement device of the present invention, a fixed member side magnetic flux shielding member made of a nonmagnetic material may be provided between the fixed member and the power transmission target (Claim 6). The clutch member may be supported by the power transmission target, and a clutch member-side magnetic flux blocking member made of a non-magnetic material may be provided between the clutch member and the power transmission target ( Claim 7). In this case, it is possible to suppress the escape of the magnetic flux from the fixed member or the clutch member to the power transmission target. Thereby, since the force which hold | maintains a clutch member in a releasing position can be strengthened, it can further suppress that a clutch member moves to an engagement position at the time of non-operation.

  In one form of the engagement device of the present invention, the power transmission target may be made of a non-magnetic material. Also in this case, since the magnetic flux can be prevented from escaping from the fixed member or the clutch member to the power transmission target, it is possible to further suppress the clutch member from moving to the engagement position during non-operation.

  As described above, according to the engagement device of the present invention, the clutch member can be moved to the release position by the magnetic force of the magnetic force generating means, so that the clutch member is separated from the fixed member by vibration or the like when not operating. Even so, the clutch member is returned to the released position by the magnetic force of the magnetic force generating means. Therefore, it can suppress that a clutch member moves to an engagement position at the time of non-operation.

The figure which shows the engaging apparatus which concerns on the 1st form of this invention. The figure which shows the inner peripheral part of the fixed side cam seen from the axial direction. The figure which shows the inner peripheral part and movable side cam of a fixed side cam seen from radial direction, Comprising: The figure which shows the case where the phase of a fixed side cam and a movable side cam corresponds. The figure which shows the inner peripheral part and movable side cam of the fixed side cam seen from radial direction, Comprising: The figure which shows the case where the phase of a fixed side cam and a movable side cam has shifted | deviated. The figure which shows the engaging apparatus which concerns on the 2nd form of this invention. The figure which shows the engaging apparatus which concerns on the 3rd form of this invention.

(First form)
FIG. 1 shows an engagement device according to a first embodiment of the present invention. The engagement device 10A is incorporated in a power transmission device 1 for transmitting power from a driving power source for a vehicle to driving wheels. In addition, since this power transmission device 1 is a well-known thing mounted in a vehicle, description is abbreviate | omitted. The power transmission device 1 includes a cylindrical rotary shaft 2 provided in a power transmission path from a traveling power source to a drive wheel. The rotating shaft 2 is provided so as to be rotatable around an axis Ax.

  The engagement device 10 </ b> A includes a first engagement member 11 and a second engagement member 12. These engaging members 11 and 12 are provided so as to be relatively rotatable around a common axis Ax. The first engagement member 11 includes a fixed cam 13 as a fixed member and a movable cam 14 as a clutch member. The fixed cam 13 and the movable cam 14 are each made of a magnetic material. Further, the fixed cam 13 and the movable cam 14 are arranged coaxially and so as to face each other in the direction of the axis Ax. The fixed cam 13 is attached to the rotary shaft 2 so as to rotate integrally with the rotary shaft 2. Therefore, the rotating shaft 2 corresponds to the power transmission target of the present invention. The fixed cam 13 includes an inner peripheral portion 13a and an outer peripheral portion 13b provided on the radially outer side of the inner peripheral portion 13a. As shown in this figure, the outer peripheral portion 13b is wider in the axis Ax direction than the inner peripheral portion 13a. Moreover, the outer peripheral part 13b is provided so that it may protrude from the inner peripheral part 13a to the movable cam 14 side. A permanent magnet 15 as a magnetic force generating means is provided on the outer peripheral portion 13b. Further, the engagement surface 13c as a fixed member side engagement surface that contacts the movable side cam 14 in the outer peripheral portion 13b is made of a material having a larger friction coefficient than the material forming the fixed side cam 13. A friction member 16 as a fixed member side friction member is provided. The rotating shaft 2 is provided with a snap ring 17 for preventing the fixed cam 13 from moving in the direction of the axis Ax.

  The movable cam 14 has an annular shape and is disposed between the fixed cam 13 and the second engagement member 12. In addition, the movable cam 14 has an axis Ax between an engagement position that contacts the second engagement member 12 and a release position that is separated from the second engagement member 12 and contacts the outer peripheral portion 13b of the fixed cam 13. It is provided to be movable in the direction. Further, the movable cam 14 is supported by the rotary shaft 2 so as to be rotatable around the axis Ax. Of the movable side cam 14, the engagement surface 14 a serving as the clutch member side engagement surface that contacts the fixed side cam 13 has a friction coefficient larger than that of the material forming the movable side cam 14. A friction member 18 is provided.

  The first engagement member 11 includes a cam ball 19 as an interposed member interposed between the fixed cam 13 and the movable cam 14. The cam ball 19 is made of a magnetic material. A V-shaped groove 20 is formed in a portion of the inner peripheral portion 13 a of the fixed side cam 13 that faces the movable side cam 14. The movable cam 14 is also formed with a V-shaped groove 21 so as to face the V-shaped groove 20 of the fixed cam 13. As shown in this figure, the cam ball 19 is held between these V-shaped grooves 20 and 21 and transmits power between the fixed cam 13 and the movable cam 14. FIG. 2 shows the inner peripheral portion 13a of the fixed cam 13 as viewed from the direction of the axis Ax. 3 and 4 show the inner peripheral portion 13a of the fixed cam 13 and the movable cam 14 as viewed from the radial direction. 3 shows a case where the phases of the fixed cam 13 and the movable cam 14 are the same, and FIG. 4 shows a case where the phases of the fixed cam 13 and the movable cam 14 are shifted. . As shown in FIG. 2, six V-shaped grooves 20 are provided in the inner peripheral portion 13a. These V-shaped grooves 20 are arranged so as to be arranged at equal intervals in the circumferential direction. The movable cam 14 is similarly provided with six V-shaped grooves 21. Similarly, these V-shaped grooves 21 are also arranged at equal intervals in the circumferential direction. Each V-shaped groove 20 has various shapes. For example, as shown in FIG. 1, each V-shaped groove 20 has a semicircular cross section when cut along a cross section including the center line of the fixed cam 13. Further, as shown in FIG. 2, when viewed from the direction of the axis Ax, each V-shaped groove 20 is curved so that an inner edge near the center of the fixed cam 13 and an outer edge away from the center form a concentric arc. is doing. Further, as shown in FIGS. 3 and 4, each V-shaped groove 20 is formed in a V shape when viewed from the radial direction of the fixed cam 13, and has a depth with respect to the rotational direction (upward or downward in the figure). It is getting shallower. The V-shaped groove 21 of the movable cam 14 has the same shape as the V-shaped groove 20 of the fixed cam 13 described above.

  As shown in FIG. 1, the engagement device 10 </ b> A includes a return spring 22. A snap ring 23 is provided on the inner peripheral side of the second engagement member 12 in the rotary shaft 2. The return spring 22 is provided between the snap ring 23 and the movable cam 14 so as to bias the movable cam 14 toward the fixed cam 13.

  The second engagement member 12 includes a coil 24 and an annular coil housing 25 that houses the coil 24. The coil housing 25 is fixed to the case 3 in which the power transmission device 1 is accommodated. The coil 24 is configured such that when excited, the movable cam 14 generates a magnetic force that is strong enough to move to the engagement position against the magnetic force of the permanent magnet 15 and the elastic force of the return spring 22.

  In the engagement device 10A, when the coil 24 is excited, the movable cam 14 moves to the engagement position, and the movable cam 14 and the second engagement member 12 come into contact with each other. Further, in this case, if the rotating shaft 2 is rotating, there is a difference between the rotation speed of the fixed cam 13 and the rotation speed of the movable cam 14, so that the fixed cam 13 and the movable cam 14 are movable as shown in FIG. The phase with the side cam 14 shifts. As a result, the cam ball 19 moves to a shallow position in the V-shaped grooves 20 and 21, and a force F that presses the movable cam 14 against the second engagement member 12 is generated. As described above, the coil housing 25 is fixed to the case 3, and thus the movable cam 14 is pressed against the second engagement member 12 in this manner, so that the rotary shaft 2 is locked so as not to rotate. As a result, the engagement device 10A is switched to the operating state.

  On the other hand, when the coil 24 is not excited, the movable cam 14 is moved to the release position by the permanent magnet 15 and the return spring 22. In this case, a gap is formed between the movable cam 14 and the second engagement member 12 as shown in FIG. Therefore, in this case, the fixed cam 13 and the movable cam 14 are rotated in a state where the movable cam 14 is pressed in a direction approaching the fixed cam 13. Thereby, the rotating shaft 2 becomes rotatable, and the engaging device 10A is switched to the non-operating state.

  According to the engaging device 10A of the first embodiment, the movable cam 14 is returned to the release position by the permanent magnet 15 and the return spring 22 even when the movable cam 14 is separated from the fixed cam 13 due to vibration or the like when not operating. Can do. Therefore, it can suppress that the movable cam 14 moves to an engagement position at the time of non-operation. And it can suppress that the stationary cam 13 and the 2nd engagement member 12 are connected accidentally by this at the time of non-operation.

  Further, in this embodiment, since the movable cam 14 is moved to the fixed cam 13 side using both the permanent magnet 15 and the return spring 22, the elastic force of the return spring 22 is compared with the case where only the return spring 22 is used. Can be reduced. In this case, the return spring 22 can be reduced in size. Further, since the magnetic force to be generated by the coil 24 when the movable cam 14 is moved to the engagement position can be reduced, the coil 24 can be reduced in size. Therefore, the engagement device 10A can be reduced in size.

  In this embodiment, since the friction members 16 and 18 are provided on the engagement surface 13c of the fixed cam 13 and the engagement surface 14a of the movable cam 14, respectively, the fixed cam 13 and the movable cam 14 are in contact with each other. Sometimes, the cams 13 and 14 can be prevented from rotating relative to each other. In this embodiment, the friction members 16 and 18 are provided on both the fixed cam 13 and the movable cam 14, but only one of these friction members 16 and 18 may be provided. Even in this case, relative rotation of the cams 13 and 14 by the friction member 16 or the friction member 18 can be suppressed.

  In the first embodiment, the cam ball 19 may be composed of a magnet. In this case, since the movable cam 14 can also be drawn toward the fixed member 13 by the cam ball 19, it is possible to further suppress the movable cam 14 from moving to the engaging position when not operating.

(Second form)
An engagement device 10B according to a second embodiment of the present invention will be described with reference to FIG. In addition, in this form, the same code | symbol is attached | subjected to a common part with a 1st form, and description is abbreviate | omitted. As shown in this figure, this embodiment differs from the first embodiment in that the permanent magnet 15 is omitted. Further, this embodiment is different from the first embodiment in that the movable cam 14 is made of a ferromagnetic material. As is well known, a ferromagnetic material is magnetized by a magnetic field applied from the outside, and remains magnetized even after the magnetic field is removed. In this embodiment, since the movable cam 14 is made of such a material, the movable cam 14 is magnetized by the coil 24 when the coil 24 is excited to move the movable cam 14 to the engagement position. Thereby, the movable cam 14 itself can be made into a magnet. Thereafter, when the excitation of the coil 24 is stopped, the magnetized movable cam 14 is attracted to the fixed cam 13 and moved to the release position. The movable cam 14 is kept in contact with the fixed cam 13 by the magnetic force generated by itself. Therefore, in this embodiment, the movable cam 14 functions as the magnetic force generation means of the present invention.

  According to this embodiment, since the movable cam 14 is made of a ferromagnetic material, the movable cam 14 itself can be a magnet. Therefore, the permanent magnet 15 can be omitted. Thereby, since the number of parts which constitute engaging device 10B can be reduced, cost can be reduced.

(Third form)
An engagement device 10C according to a third embodiment of the present invention will be described with reference to FIG. In addition, in this form, the same code | symbol is attached | subjected to the part common to each form mentioned above, and description is abbreviate | omitted. As shown in this figure, in this embodiment, a first magnetic flux blocking member 30 as a fixed member-side magnetic flux blocking member is provided between the fixed cam 13 and the rotating shaft 2. Further, a second magnetic flux blocking member 31 as a clutch member side magnetic flux blocking member is also provided between the movable cam 14 and the rotating shaft 2. These magnetic flux shielding members 30 and 31 are made of a nonmagnetic material. In this case, the escape of magnetic flux from the fixed side cam 13 or the movable side cam 14 to the rotating shaft 2 is suppressed. Therefore, the magnetic path when the movable cam 14 is in the release position is formed in the fixed cam 13, the movable cam 14, and the cam ball 19 as indicated by a broken line M in the drawing.

  Further, in this embodiment, the coil housing 23 includes a protruding portion 32 that protrudes radially inward. A groove 2a is provided on the outer peripheral surface of the rotating shaft 2, and the protrusion 32 is inserted into the groove 2a. The rotating shaft 2 is maintained so as to be rotatable even when the protruding portion 32 is inserted into the groove 2a.

  According to this embodiment, it is possible to suppress the escape of magnetic flux from the fixed cam 13 or the movable cam 14 to the rotary shaft 2. As a result, it is possible to increase the force for holding the movable cam 14 in the release position, so that it is possible to further suppress the movable cam 14 from moving to the engaging position during non-operation. Further, in this case, the permanent magnet 15 can be downsized as compared with the case where the magnetic flux escapes to the rotating shaft 2.

  In this embodiment, only one of the first magnetic flux blocking member 30 and the second magnetic flux blocking member 31 may be provided. Also in this case, it is possible to prevent the magnetic flux from escaping from the cam provided with the magnetic flux shielding members 30 and 31 to the rotating shaft 2.

  In this form, the rotating shaft 2 may be made of a nonmagnetic material. In this case, the escape of the magnetic flux from the fixed cam 13 or the movable cam 14 to the rotating shaft 2 can be further suppressed.

  This invention is not limited to each form mentioned above, It can implement with a various form. For example, it is not necessary to implement each form mentioned above separately. You may implement combining each form mentioned above suitably, such as implementing combining a 1st form and a 3rd form. In the first and third embodiments described above, the permanent magnet is provided on the fixed cam, but the permanent magnet may be provided on the movable cam. Moreover, you may provide a permanent magnet so that it may draw near to both a fixed side cam and a movable side cam.

  In each of the embodiments described above, the second engagement member is fixed to the case and the engagement device functions as a lock device for locking the rotation of the rotation shaft. It may be provided in the power transmission path. In this case, the first engagement member and the second engagement member may be provided in different rotating bodies, and the engagement device may function as a clutch device.

2 Rotating shaft (Power transmission target)
10A, 10B, 10C Engaging device 11 First engaging member 12 Second engaging member 13 Fixed cam (fixing member)
13c engagement surface (fixing member side engagement surface)
14 Movable cam (clutch member)
14a Engagement surface (clutch member side engagement surface)
15 Permanent magnet (magnetic force generating means)
16 Friction member (Friction member on the fixed member side)
18 Friction member (clutch member side friction member)
19 Cam ball (intervening member)
24 Coil 30 First magnetic flux blocking member (fixed member side magnetic flux blocking member)
31 2nd magnetic flux interruption member (clutch member side magnetic flux interruption member)
Ax axis

Claims (8)

A first engagement member and a second engagement member provided so as to be relatively rotatable around a common axis;
The first engaging member is disposed between a fixing member made of a magnetic material attached to a power transmission target, and between the fixing member and the second engaging member, and is in contact with the second engaging member. A clutch member made of a magnetic material provided so as to be movable between an engagement position and a release position that is separated from the second engagement member and is in contact with the fixing member; and between the fixing member and the clutch member An interposition member interposed between the fixing member and the clutch member so that power is transmitted at
In the engagement device in which the second engagement member is provided with a coil capable of generating a magnetic force having a strength to move the clutch member to the engagement position.
At least one of the fixing member and the clutch member is provided with magnetic force generating means for generating a magnetic force between the fixing member and the clutch member so that the clutch member moves to the release position. Engagement device.   The engaging device according to claim 1, wherein the magnetic force generating means is the clutch member made of a ferromagnetic material.   The fixed member side friction member whose friction coefficient is larger than the material which forms the said fixed member is provided in the fixed member side engaging surface which the said clutch member contacts among the said fixed members. The engagement device described in 1.   The clutch member side friction member with a larger friction coefficient than the material which forms the said clutch member is provided in the clutch member side engagement surface which contacts the said fixing member among the said clutch members. The engagement device according to any one of the above.   The engagement device according to any one of claims 1 to 4, wherein the interposition member is formed of a magnet.   The engagement device according to any one of claims 1 to 5, wherein a fixing member side magnetic flux shielding member made of a nonmagnetic material is provided between the fixing member and the power transmission target. The clutch member is supported by the power transmission target,
The engagement device according to any one of claims 1 to 6, wherein a clutch member-side magnetic flux blocking member made of a nonmagnetic material is provided between the clutch member and the power transmission target.   The engagement device according to any one of claims 1 to 7, wherein the power transmission target is made of a nonmagnetic material.

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