JP2011196410A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device capable of reducing operation force when cutting off the power transmission.SOLUTION: The power transmission device is provided for switching mutual projection parts 12 and 22 mutually opposed by a permanent magnet 31 to a coupled state of being magnetically coupled and an uncoupled state of being magnetically uncoupled by the movement of a magnetic coupling control body 30. An uncoupling control body 140 is arranged in a part being the opposite side of a pulley side rotary body 10 and a shaft side rotary body 20 to the magnetic coupling control body 30. When moving the magnetic coupling control body 30 along the rotational axis from the coupled state, these mutual magnetic coupling control body 30 and uncoupling control body 140 are magnetically coupled by the permanent magnet 31.

Description

  The present invention relates to a power transmission device in which power is transmitted by magnetically coupling between a first rotating body and a second rotating body.

  As this type of prior art, for example, there is one described in Patent Document 1. This power transmission device transmits power between a drive shaft and a driven shaft whose rotational axes coincide with each other, and a disk-like rotating body is provided at each of the end of the drive shaft and the end of the driven shaft. I have. The two rotating bodies are spaced apart from each other and have permanent magnets on end faces facing each other.

  In this power transmission device, when one rotating body and the other rotating body are brought close to each other, a magnetic attractive force acts between the permanent magnets arranged on each rotating body, and these rotating bodies are magnetically coupled. Power can be transmitted. On the other hand, when the two rotating bodies are separated from each other, the magnetic attractive force between the permanent magnets does not act, and the rotating bodies are magnetically disconnected and the power transmission is interrupted.

JP 2008-51264 A

  By the way, in the power transmission device described above, when power transmission is interrupted from the power transmission state, it is necessary to separate one rotating body from the other rotating body against the magnetic attractive force acting between them. Therefore, a large amount of operation is required when switching the power transmission state. In particular, in the power transmission device that transmits a large rotational torque, the magnetic attraction force by the permanent magnet is also large, and thus the above-described problem becomes more remarkable.

  In view of the above circumstances, an object of the present invention is to provide a power transmission device capable of reducing an operating force when power transmission is interrupted.

  In order to achieve the above object, the power transmission device according to the present invention rotates in a state where the convex portion provided on the first rotating body and the convex portion provided on the second rotating body face each other. The body is arranged to be rotatable around a rotation axis that is common to each other, and a magnetic coupling control body including a permanent magnet is arranged to be movable along the rotation axis, and by moving the magnetic coupling control body The power transmission device is configured to switch between a coupling state in which the convex portions facing each other by the permanent magnet are magnetically coupled to each other and a non-coupling state in which the convex portions are magnetically uncoupled. A non-coupling control body is disposed at a position opposite to the first rotating body and the second rotating body with respect to the body, and the magnetic coupling control body is moved from the coupled state along the rotational axis. For magnetic coupling control and non-coupling Characterized thereby magnetically coupled by the permanent magnet between your body.

  Further, the present invention provides the power transmission device described above, wherein the uncoupled control body is configured such that when the magnetic coupling control body is moved from the coupled state along the rotational axis, the first rotating body or the It is arranged at a position magnetically coupled to the magnetic coupling controller prior to the second rotating body.

  Further, in the power transmission device described above, the first rotating body and the second rotating body are configured in a circular shape having the same outer diameter, and the magnetic coupling control body includes: The first rotating body and the second rotating body are configured to have an annular shape that covers the outer periphery, and the non-coupling control body is configured to have an annular size that covers the outer periphery of the magnetic coupling control body. .

  According to the present invention, in the power transmission device described above, the magnetic coupling control body is configured in a cylindrical shape, and the first rotating body and the second rotating body each cover an outer periphery of the magnetic coupling control body. It is configured in a ring shape, and the non-coupling controller is configured to have an outer diameter accommodated in the magnetic coupling controller.

  According to the present invention, the magnetic coupling control body provided with the permanent magnet is moved along the rotation axis of the first rotating body and the second rotating body, so that the magnetic coupling state and the non-coupling state are achieved. Since switching is performed, that is, when the magnetic coupling state is switched, it is not necessary to move the permanent magnet in the direction of separating the first rotating body and the second rotating body. I don't need it. Moreover, since the magnetic coupling control body and the non-coupling control body are magnetically coupled when the magnetic coupling control body is moved from the coupling state along the rotation axis, 2 in the non-coupling state. It is possible to reduce the magnetic coupling force acting between the convex portions of the two rotating bodies.

FIG. 1 shows a power transmission device according to Embodiment 1 of the present invention, and is a cross-sectional view in a magnetically coupled state. 2 is a cross-sectional view showing a state where the power transmission device shown in FIG. 1 is magnetically disconnected. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an exploded perspective view showing a main part of the power transmission device shown in FIG. FIG. 5 shows a modified example of the power transmission device shown in FIG. 1, (a) is a cross-sectional side view in a magnetically coupled state, and (b) is in a magnetically uncoupled state. It is a cross-sectional side view. FIG. 6 is a perspective view of a main part of the power transmission device according to the second embodiment of the present invention. 7 is an exploded perspective view of a main part of the power transmission device shown in FIG. FIG. 8 shows the power transmission device shown in FIG. 6, wherein (a) is a sectional side view in a magnetically coupled state, and (b) is a sectional side view in a magnetically uncoupled state. It is.

  Hereinafter, preferred embodiments of a power transmission device according to the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
1 to 3 show a power transmission apparatus according to Embodiment 1 of the present invention. The power transmission device illustrated here transmits power between a pulley P that is rotatably arranged with respect to the frame F and a shaft member SH that is rotatably supported with respect to the frame F.

  The pulley P has an annular shape having a center hole PH. By interposing a bearing B1 between the inner peripheral surface of the center hole PH and the outer peripheral surface of the cylindrical portion FS formed in the frame F, It is possible to rotate using the axis of the cylindrical portion FS as a rotation axis. The pulley P has a housing portion PT formed therein. The accommodating part PT has an annular shape formed along the pulley P, and is open to the end surface of the pulley P located on the tip surface side of the shaft member SH.

  A pulley-side rotating body (rotating body) 10 is disposed in the housing portion PT of the pulley P. As shown in FIGS. 3 and 4, the pulley-side rotating body 10 includes a pulley-side base portion 11 having an annular flat plate shape, and a plurality of pulley-side convex portions 12 provided on one end surface of the pulley-side base portion 11. It has and is integrally formed of a magnetic material. The pulley-side convex portions 12 have a rectangular parallelepiped shape extending along the radial direction of the ring, and are arranged at equal intervals along the circumferential direction of the pulley-side base portion 11. The plate thickness along the radial direction of the pulley-side base 11 is substantially ½ of the internal dimension along the radial direction of the housing part PT, and the inner diameter of the pulley-side base 11 is equal to the internal outer diameter of the housing part PT. Almost identical. As shown in FIGS. 1 and 2, the pulley-side rotating body 10 is configured so that the axis of the pulley-side base 11 coincides with the axis of the pulley P, and the pulley-side convex portion 12 is placed on the opening side of the accommodating portion PT. It is fixed to the accommodating portion PT of the pulley P through the end face of the pulley side base portion 11 in the oriented state.

  The shaft member SH has a solid columnar shape, and a cylindrical shape is obtained by interposing a bearing B2 between the outer peripheral surface of the shaft member SH and the inner peripheral surface of the hollow hole FSH formed in the cylindrical portion FS of the frame F. It arrange | positions in the inside of the hollow hole FSH in the aspect rotated centering around the rotating shaft center of the part FS. A support plate RP is attached to the distal end portion of the shaft member SH in a state where the axes are aligned with each other. The support plate RP has a disk shape with an outer peripheral edge portion having an outer diameter facing the opening of the accommodating portion PT formed in the pulley P. The support plate RP has a shaft-side rotating body at a portion facing the pulley-side rotating body 10. (Rotating body) 20 is provided. As shown in FIGS. 3 and 4, the shaft-side rotating body 20 has a cylindrical shaft-side base portion 21 and a plurality of shaft-side convex portions 22 provided on one end surface of the shaft-side base portion 21. Thus, like the pulley-side rotating body 10, it is integrally formed of a magnetic material. The shaft-side base portion 21 is formed in an annular shape whose cross section is substantially the same as that of the pulley-side base portion 11, and the shaft-side convex portion 22 is formed at a portion facing the pulley-side convex portion 12. As shown in FIGS. 1 and 2, the shaft-side rotating body 20 has the shaft-side base 21 aligned with the shaft center of the shaft member SH, and the shaft-side protruding portion 22 is connected to the pulley-side protruding portion 12. It is fixed to the support plate RP via the shaft side base 21 in a state of being opposed to the support plate RP. A gap that does not contact each other is secured between the inner peripheral surface of the shaft-side base portion 21 and the inner outer peripheral surface of the accommodating portion PT formed in the pulley P.

  The pulley P and the shaft member SH are prevented from moving along the rotational axis of the cylindrical portion FS in a state where the pulley-side convex portion 12 and the shaft-side convex portion 22 are slightly separated from each other. It is in the state.

  The power transmission device also includes a magnetic coupling control body 30 and a non-coupling control body 40. As shown in FIGS. 3 and 4, the magnetic coupling control body 30 is configured by sticking annular plate-shaped yoke plates 32 and 33 each made of a magnetic material to both end faces of a cylindrical permanent magnet 31. It is what. The permanent magnet 31 is magnetized along the axial direction of the cylinder, and has an outer diameter slightly smaller than the inner inner peripheral surface of the accommodating part PT, and outer diameters of the pulley-side rotating body 10 and the shaft-side rotating body 20. The inner diameter is slightly smaller than the inner diameter. In the illustrated example, it is magnetized in the direction indicated by the white arrow in FIGS. The yoke plates 32 and 33 have the same cross-sectional shape as the permanent magnet 31. As shown in FIGS. 1 and 2, the magnetic coupling control body 30 is attached to the end surface of the slide body SP in a state in which the axis is aligned with the rotation axis of the cylindrical portion FS. The slide body SP is formed in a disk shape having the same outer diameter as the magnetic coupling control body 30, and is magnetically coupled to the projecting end surface of the cylindrical projection CB formed on one end surface thereof via one yoke plate 33. The control body 30 is held. Although not clearly shown in the figure, this slide SP is arranged so as to be movable along the axial direction in a state where its axial center is aligned with the rotational axis of the cylindrical portion FS. It is possible to move the magnetic coupling control body 30 along the axial direction in a state where the control body 30 is disposed in the outer peripheral side of the pulley-side rotating body 10 and the shaft-side rotating body 20 in the housing portion PT of the pulley P. It is.

  The non-coupling control body 40 is formed in a cylindrical shape by a magnetic body, and is disposed on the inner peripheral surface facing the magnetic coupling control body 30 in the accommodating portion PT formed in the pulley P. On the inner peripheral surface of the non-coupling control body 40, protrusions 40a and 40b are formed at both ends. The protrusions 40a and 40b are annular protrusions that protrude inward from the inner peripheral surface of the non-coupling control body 40, and have a slightly smaller inner diameter than the inner peripheral surface of the pulley P. is there. The length of the non-coupling control body 40 along the axial direction is substantially the same as that of the magnetic coupling control body 30. The uncoupled control body 40 is disposed at a position facing the shaft-side rotating body 20 in the housing portion PT of the pulley P.

  In the power transmission device configured as described above, as shown in FIG. 1, the slide body SP is moved in the direction approaching the support plate RP, and one yoke plate 32 of the magnetic coupling control body 30 is moved to the pulley-side rotating body 10. When the other yoke plate 33 is positioned on the outer peripheral portion of the shaft-side rotating body 20, the pulley-side convex portion 12 and the shaft side facing each other are shown in FIG. A magnetic circuit composed of the permanent magnets 31 of the magnetic coupling control body 30 is configured via the convex portion 22. As a result, the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically coupled. For example, if the pulley P is rotated, the rotational force is applied to the pulley-side rotating body 10, the magnetic coupling control body 30, and the shaft. The shaft member SH is transmitted to the shaft member SH through the side rotating body 20 and the support plate RP, and the shaft member SH rotates about the axis. In this case, since the magnetic coupling control body 30 does not have a convex portion on the surface facing the pulley-side rotator 10 and the shaft-side rotator 20, the pulley-side rotator 10 and the shaft-side rotator 20 are also provided. Since no convex portion is provided, the pulley side rotating body 10 and the shaft side rotating body 20 do not rotate regardless of the rotation.

  On the other hand, as shown in FIG. 2 from the above-described state, the slide body SP is moved away from the support plate RP, and the two yoke plates 32 and 33 of the magnetic coupling control body 30 are both of the shaft-side rotating body 20. When positioned on the outer periphery, a magnetic circuit formed by the permanent magnet 31 of the magnetic coupling control body 30 is formed between the non-coupling control body 40 as indicated by a broken line arrow in FIG. As a result, the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically uncoupled. For example, when the pulley P is rotated, the rotational force is transmitted to the shaft member SH. There is no.

  Here, according to the power transmission device described above, the magnetic coupling control body 30 including the permanent magnets 31 can be provided without changing the mutual distance between the pulley-side convex portion 12 and the shaft-side convex portion 22 facing each other. By moving along the rotational axis, the pulley-side convex portion 12 and the shaft-side convex portion 22 are not magnetically coupled. That is, since the magnetic coupling state is switched without moving the magnetic circuit by the permanent magnet 31 in the direction of separating, a large operating force is not required.

  Moreover, in the situation where the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically uncoupled, most of the magnetic circuit by the permanent magnet 31 of the magnetic coupling controller 30 is for non-coupling. It is comprised between the control bodies 40, and the magnetic flux which leaks to the pulley side convex part 12 and the shaft side convex part 22 can be reduced significantly. Accordingly, the drag torque by the permanent magnet 31 when the rotation of either the pulley P or the shaft member SH is stopped can be greatly reduced.

  Further, as shown in FIGS. 5A and 5B, if the power transmission device is configured by disposing the non-coupling control body 40 'in a position close to the pulley-side rotating body 10, the magnetic coupling control is performed. When the body 30 is moved from the coupled state along the rotational axis, the magnetic coupling control body 30 and the non-coupling control body 40 are magnetically coupled prior to the shaft-side rotating body 20, and the pulley-side convex portion 12. And the shaft-side convex portion 22 can be magnetically uncoupled, and the moving distance of the magnetic coupling controller 30 can be shortened. Further, when the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically uncoupled, a magnetic circuit is configured between the magnetic coupling control body 30 and the shaft-side rotating body 20. Therefore, it is sufficient for the shaft-side rotating body 20 that the length X along the axial direction is the position indicated by the two-dot chain line in FIG. As a result, it is possible to shorten the dimension along the rotational axis of the power transmission device.

(Embodiment 2)
FIGS. 6-8 shows the power transmission device which is Embodiment 2 of this invention. The power transmission device illustrated here is a pulley-side rotation in the main components (pulley-side rotator, shaft-side rotator, magnetic coupling controller, and non-coupling controller) of the power transmission device shown in the first embodiment. The magnetic coupling control body 130 and the non-coupling control body 140 are arranged on the inner peripheral side with respect to the body 10 and the shaft-side rotating body 20, and the pulley-side rotating body 10 and the shaft-side rotating body are different from those in the first embodiment. Only the dimensions of the magnetic coupling controller 130 and the non-coupling controller 140 with respect to 20 are different. That is, as shown in FIGS. 6 and 7, the magnetic coupling control body 130 of the second embodiment includes an annular plate-shaped yoke plate 132 made of a magnetic material on each end face of a cylindrical permanent magnet 131. 133 is affixed and has an outer diameter slightly smaller than the inner diameters of the pulley-side rotating body 10 and the shaft-side rotating body 20. The point that the permanent magnet 131 of the magnetic coupling controller 130 is magnetized along the axial direction of the cylinder is the same as in the first embodiment. The non-coupling control body 140 is formed in a cylindrical shape by a magnetic body, and is disposed on the inner peripheral side of the magnetic coupling control body 130. Protrusions 140 a and 140 b are formed on both ends of the outer peripheral surface of the non-coupling control body 140. The protrusions 140a and 140b are annular protrusions that protrude outward from the outer peripheral surface of the non-coupling control body 140, and have an inner diameter slightly smaller than the inner peripheral surface of the magnetic coupling control body 130. It is. The length of the non-coupling controller 140 along the axial direction is substantially the same as that of the magnetic coupling controller 130. The uncoupled control body 140 is disposed at a position facing the shaft-side rotating body 20. The pulley-side rotating body 10 and the shaft-side rotating body 20 applied in the second embodiment have the same configuration as that of the first embodiment, and the same reference numerals are given and detailed descriptions thereof are omitted. To do.

  In the power transmission device configured as described above, as shown in FIG. 8A, one yoke plate 132 of the magnetic coupling control body 130 is positioned on the inner peripheral portion of the pulley-side rotating body 10, and the other yoke is arranged. When the plate 133 is positioned on the inner peripheral portion of the shaft-side rotator 20, as shown by the broken-line arrows in FIG. 8A, between the pulley-side convex portion 12 and the shaft-side convex portion 22 facing each other. The magnetic circuit by the permanent magnet 131 of the magnetic coupling control body 130 is comprised via these. As a result, the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically coupled. For example, if the pulley-side rotator 10 is rotated, the rotational force is transmitted to the shaft side via the magnetic coupling controller 130. It is transmitted to the rotating body 20 and the shaft-side rotating body 20 rotates around the axis.

  On the other hand, when the two yoke plates 132 and 133 of the magnetic coupling control body 130 are positioned on the inner peripheral portion of the shaft-side rotating body 20 as shown in FIG. ), A magnetic circuit including the permanent magnet 131 of the magnetic coupling controller 130 is configured with the non-coupling controller 140. As a result, the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically non-coupled. For example, even when the pulley-side rotating body 10 is rotated, the rotational force is increased by the shaft-side rotating body 20. Will not be transmitted to.

  Also in the power transmission device according to the second embodiment, the magnetic coupling control body 130 including the permanent magnet 131 can be provided without changing the mutual distance between the pulley-side convex portion 12 and the shaft-side convex portion 22 facing each other. By moving along the rotation axis, the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically uncoupled, so a large operating force is required when switching the magnetic coupling state. I don't need it.

  Moreover, in the situation where the pulley-side convex portion 12 and the shaft-side convex portion 22 are magnetically non-coupled, most of the magnetic circuit by the permanent magnet 131 of the magnetic coupling controller 130 is for non-coupling. It is comprised between the control body 140, and the magnetic flux which leaks to the pulley side convex part 12 and the shaft side convex part 22 can be reduced significantly. Accordingly, the drag torque by the permanent magnet 131 when the rotation of either the pulley-side rotator 10 or the shaft-side rotator 20 is stopped can be greatly reduced.

DESCRIPTION OF SYMBOLS 10 Pulley side rotary body 12,22 Convex part 20 Shaft side rotary body 30 Magnetic coupling control body 31 Permanent magnet 40 Non-coupling control body 130 Magnetic coupling control body 131 Permanent magnet 140 Non-coupling control body

Claims (4)

Each of the rotating bodies is disposed so as to be rotatable around a common rotation axis in a state where the convex portions provided on the first rotating body and the convex portions provided on the second rotating body face each other. In addition, a magnetic coupling control body including a permanent magnet is disposed so as to be movable along the rotation axis, and the magnetic coupling control body is moved between the convex portions opposed to each other by the permanent magnet. A power transmission device configured to switch between a coupled state coupled to a magnetically uncoupled state and a non-coupled state coupled magnetically,
A non-coupling control body is disposed at a position opposite to the first rotating body and the second rotating body with respect to the magnetic coupling control body, and the magnetic coupling control body is rotated from the coupled state to the rotation. A power transmission device characterized by magnetically coupling between the magnetic coupling control body and the non-coupling control body by the permanent magnet when moved along the axis.   The non-coupling controller is configured to control the magnetic coupling control prior to the first rotating body or the second rotating body when the magnetic coupling controller is moved from the coupled state along the rotation axis. The power transmission device according to claim 1, wherein the power transmission device is disposed at a position where it is magnetically coupled to the body.   The first rotating body and the second rotating body are configured in a circular shape with the same outer diameter, and the magnetic coupling control body includes the first rotating body and the second rotating body. 2. The power transmission device according to claim 1, wherein the power transmission device is configured in an annular shape that covers an outer periphery, and the non-coupling control body is configured in an annular shape that covers an outer periphery of the magnetic coupling control body.   The magnetic coupling control body is configured in a cylindrical shape, the first rotating body and the second rotating body are each configured in an annular shape covering the outer periphery of the magnetic coupling control body, and the non-coupling control body is The power transmission device according to claim 1, wherein the power transmission device is configured to have an outer diameter accommodated in the magnetic coupling control body.

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