JP2942915B2 - Dynamic vibration absorber for pendulum structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic vibration absorber for a pendulum structure such as a ropeway, a gondola lift, a ski lift, and the like, which suppresses the roll of the pendulum structure due to wind or the like.

[0002]

2. Description of the Related Art A basic patent for a dynamic vibration absorber having a pendulum structure has already been filed in Japanese Patent Application No. 5-71696 by Hiroshi Matsuhisa, a professor of Kyoto University, and has been presented at a conference.

[0003]

In the dynamic vibration absorber of the pendulum structure, the mass body smoothly moves even with a small roll while securing a large suppressing force when the roll is large.
Ideally, a suppressing force against the roll occurs.

[0004] The conventional dynamic vibration absorber of the pendulum structure does not have such ideal performance.

It is an object of the present invention to provide a dynamic vibration absorber of a pendulum structure which overcomes such problems of the prior art. An object of the present invention is to provide a dynamic vibration absorber of a pendulum structure in which the structure of the eddy current brake means is simplified. An object of the present invention is to provide a dynamic vibration absorber of a pendulum structure that can increase an eddy current braking force.
An object of the present invention is to provide a dynamic vibration absorber of a pendulum structure having improved speed proportional braking characteristics. An object of the present invention is to provide a dynamic vibration absorber of a pendulum structure that can reduce the size of an eddy current brake means.

[0006]

SUMMARY OF THE INVENTION A pendulum structure according to the present invention
According to the dynamic vibration absorber (20b) of (10), the pendulum structure (10) is suspended from the cableway (18). The dynamic vibration absorber (20b) is attached to (a) the pendulum structure body (14, 16) and is attached to the pendulum structure body (1).
A guide rail (22) extending in the swing direction of (4, 16), (b) a mass body (24) movable along the guide rail (22), and (c) a conductor (35) and a magnet (38b). And an eddy current brake means for generating an eddy current in the conductor (35) due to the relative speed of the conductor and reducing the relative speed between the two by the Joule loss. The guide rail (22b) includes a pair of side walls (42) extending on both sides of the side of the mass (24b), and each side wall (42) has a mass body.
A conductor (35) is provided on the side facing the side of (24b), and the mass body (24b)
Has magnets (38b) on both sides,

[0007] The dynamic vibration absorber (2) of the pendulum structure (10) of the present invention.
According to 0b), the guide rail (22b) includes the magnetic body (36) on the opposite side of the conductor (35) from the mass body (24b).

[0008] The dynamic vibration absorber (2) of the pendulum structure (10) of the present invention.
According to 0b), the magnet (38b) is attached to a portion of the mass body (32) of the mass body (24b) facing the guide rail (22b), and the mass body (32) is a magnetic body.

[0009] The dynamic vibration absorber (2) of the pendulum structure (10) of the present invention.
According to 0c), the pendulum structure (10) is suspended on the cableway (18). The dynamic vibration absorber (20c) includes (a) a pendulum structure body (14, 16).
A guide rail (22) attached to the main body (14, 16) and extending in the swing direction of the pendulum structure body (14, 16); (b) a mass body (24c) movable along the guide rail (22); and (c) a conductor ( An eddy current brake means is provided for generating an eddy current in the conductor (52) due to the relative speed between the magnet (52) and the magnet (38c) and reducing the relative speed of the conductor (52) by the Joule loss. The mass body (24c) includes a wheel (34) rolling on the guide rail (22), and an axle (50) having the wheel (34) attached to both ends and rotating integrally with the wheel (34).
It has. The conductor (52) is attached to the axle (50) so as to rotate integrally with the axle (50), and the magnet (38c) has a gap on both sides of the conductor (52) in the axial direction of the axle (50). The mass body (24c) is attached to the mass body main body (32) so as to face and stand.

[0010] The dynamic vibration absorber (2) of the pendulum structure (10) of the present invention.
According to 0d), the pendulum structure (10) is suspended on the cableway (18). The dynamic vibration absorber (20d) includes (a) a pendulum structure body (14, 1).
A guide rail (22) attached to 6) and extending in the swing direction of the pendulum structure body (14, 16); (b) a mass body (24d) movable along the guide rail (22); and (c). An eddy current brake means is provided for generating an eddy current in the conductor (54) due to the relative speed between the conductor (54) and the magnet (38d) and reducing the relative speed between the conductor (54) and the Joule loss. The mass body (24d) includes a wheel (34) that rolls on the guide rail (22), and an axle (5) having the wheel (34) attached to both ends and rotating integrally with the wheel (34).
0). The magnet (38d) is attached to the axle (50) so as to rotate integrally with the axle (50), and the conductor (54) is
The mass body is sandwiched between the magnets (38d) from both sides in the axial direction of the axle (50) and faces each other with a gap between the magnets (38d).
(24d) attached to the mass body (32).

The dynamic vibration absorber (2) of the pendulum structure (10) of the present invention
According to 0a, b, c, d), the guide rail (22,22a, b) is attached to the suspension arm (16) of the pendulum structure body (14,16).

[0012]

[Function] In the dynamic vibration absorber (20b) of the pendulum structure (10),
As the mass (24b) moves along the guide rail (22b), an eddy current is generated in the conductor (35) of the guide rail (22b),
Joule loss due to the eddy current absorbs the relative movement between the mass (24b) and the guide rail (22b). Guide rail (22b)
The eddy current due to the relative movement of the mass body (24b) with respect to is generated symmetrically with respect to the movement direction of the mass body (24b), and the force perpendicular to the movement direction of the mass body (24b) cancels out. Is done. Therefore, the mass body (24b) runs smoothly against the roll of the pendulum structure (10).

In the dynamic vibration absorber (20b) of the pendulum structure (10), in the guide rail (22b), the magnetic body (36) on the non-opposite side of the mass body (24b) crosses the conductor (35). It acts as a yoke for constructing a magnetic circuit that generates lines of magnetic force.

In the dynamic vibration absorber (20b) of the pendulum structure (10), the mass body (32) made of a magnetic material is a yoke for forming a magnetic circuit that generates magnetic lines of force that cross the conductor (35). Act as

In the dynamic vibration absorber (20c) of the pendulum structure (10), as the wheels (34) of the mass body (24c) roll on the guide rail (22), the axle (50) rotates. , Conductor (52) on the axle (50) side
And the magnet (38c) on the side of the mass body (32) causes relative rotation. As a result, an eddy current is generated in the conductor (52), Joule loss is generated, and the relative movement between the conductor (52) and the magnet (38c) is absorbed, so that the side of the pendulum structure body (14, 16) is absorbed. The shaking is braked.

In the dynamic vibration absorber (20d) of the pendulum structure (10), the axle (50) rotates as the wheels (34) of the mass body (24d) roll on the guide rail (22). , Axle (50) side magnet (38
A relative rotation occurs between d) and the conductor (54) on the mass body (32) side. As a result, an eddy current is generated in the conductor (52), Joule loss is generated, the relative motion between the conductor (52) and the magnet (38d) is absorbed, and the side of the pendulum structure body (14, 16) is absorbed. The shaking is braked.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 10 is a schematic view of the ropeway 10 equipped with the dynamic vibration absorber 20. The transporter 12 includes a box 14 for accommodating a person, and a suspension arm 16 fixed to a cableway 18 and a roof of the box 14 at upper and lower ends, respectively. The dynamic vibration absorber 20 includes a guide rail 22 and a mass body 24 that is free to move along the guide rail 22 while being prevented from falling off the guide rail 22. The guide rail 22 extends in an arc shape in the left-right direction of the transporter 12, that is, in the roll direction of the transporter 12, and is fixed to the suspension arm 16 at the center. As the transporter 12 receives a force from the lateral direction due to wind or the like, the box portion 14 and the suspension arm 16 swing substantially around the cableway 18, that is, roll, whereas the mass body 24 is The portion 14 and the suspension arm 16 vibrate at a different vibration frequency, and vibrate on the guide rail 22 relative to the guide rail 22.

Hereinafter, various specific examples of the dynamic vibration absorber 20 will be described.
The dynamic vibration absorbers 20a-d will be described. In the description of each dynamic vibration absorber 20a-d, the components embodied corresponding to the components of FIG. 10 are indicated by the numerals used as the reference numerals of the components in FIG. .
For example, the mass body 24 in FIG. 10 is indicated as a mass body 24a in the dynamic vibration absorber 20a.

FIG. 1 shows a dynamic vibration absorber 20a as a first embodiment.
FIG. The mass body 24a is rotatably attached to the mass body 32 made of a soft magnetic material such as iron, and at the lower side of the mass body 32 in the front, rear, left, and right directions in the moving direction of the mass body 24a, to reduce the weight of the mass body 24a. It has four wheels 34 for support. The lower surface of the magnet 38a is higher than the lower end of the wheel 34,
The mass body 32 is fixed to the lower surface side. Guide rail 22a
Has a two-layer structure of a layer of the conductor 35 on the upper surface side and a layer of the magnetic body 36 of the soft magnetic material on the lower surface side. The vibration of the mass 24a on the guide rail 22a due to the roll of the transporter 12 generates an eddy current in the conductor 35, and the Joule loss due to the eddy current causes the mass
Absorb the relative movement between 24a and guide rail 22a,
The relative vibration between the guide rails 24a and the guide rails 22a is suppressed, and as a result, the roll of the transporter 12 is suppressed. Mass body 32 and magnetic body 36
Acts as a yoke for forming a magnetic circuit that generates magnetic lines of force that cross the conductor 35, and increases the magnetic flux density of the magnetic lines of force that cross the conductor 35 to reduce the electromagnetic force acting between the conductor 35 and the magnet 38a. To increase the roll suppressing effect of the transporter 12.

FIG. 2 shows a dynamic vibration absorber 20b as a second embodiment.
FIG. 3 is a detailed view as viewed from above. The guide rail 22b includes a side wall portion 42 that stands along both side edges in the width direction of the bottom portion 40,
The side wall portion 42 has a two-layer structure of a layer of the inner conductor 35 and a layer of the outer magnetic body 36, similarly to the bottom surface portion 40 of the guide rail 22a of FIG. The mass body 24b is similar to the mass body 24b in FIG.
Below the mass body 32, there are provided four wheels 34 which are respectively disposed in front, rear, left and right directions of the movement of the mass body 24b and support the weight of the mass body 24b. The wheels 44 are connected to the mass body 32
Are attached to the front and rear sides of the left and right sides of the mass body 32 so as to be rotatable about a straight line in the height direction, and roll on the inner surface side of the side wall portion 42. The magnet 38b is fixed to both sides of the mass body 32 with a gap between the magnet 38b and the inner surface of the side wall 42. The mass body 24b is
The carrier 12 oscillates on the guide rails 22b as it rolls, and eddy currents are generated in the conductors 35. Joule loss due to the eddy currents causes relative motion between the mass body 24b and the guide rails 22b. , The relative vibration between the mass body 24b and the guide rail 22b is suppressed, and as a result, the horizontal swing of the transporter 12 is suppressed. The mass body 32 and the magnetic body 36 act as a yoke for forming a magnetic circuit that generates magnetic lines of force that cross the conductor 35, and increase the magnetic flux density of the magnetic lines of force that cross the conductor 35, thereby increasing the
To increase the electromagnetic force acting between the
Enhances the roll suppression effect. Further, since the conductor 35 and the magnet 38b are provided on both the left and right sides with respect to the vibration direction of the mass body 24b, the left and right forces acting on the mass body 24b are offset,
The vibration of the mass body 24b becomes smooth.

FIGS. 3 and 4 are views showing a dynamic vibration absorber 20c as a third embodiment viewed from the width direction and the extending direction of the guide rail 22. FIG. The bracket 48 has its upper end fixed to the front, rear, left and right portions of the lower surface of the mass body 32 and protrudes downward. The axle 50 is rotatably supported at the left and right ends by the lower end of a bracket 48, and the left and right wheels 34 are fixed near the bracket 48. The plurality of magnets 38c are
Through the axle 50 in a center hole with a diameter larger than the diameter of
It is arranged at equal intervals in the axial direction of the axle 50 between the left and right wheels 34 and is connected to the lower surface of the mass body 32 at the upper end. A plurality of conductors 52 one less than the number of magnets 38c
Is a circle having the same diameter as the magnet 38c, is located between the magnets 38c, 38c with a gap between the magnet 38c, and is fixed to the axle 50.

FIGS. 5 and 6 show the arrangement of magnetic poles on both surfaces of the magnet 38c of FIG. On each surface of the magnet 38c, N and S of the magnetic poles are alternately arranged in the circumferential direction, and at the same position in the circumferential direction, the magnetic poles are opposite on both surfaces of the magnet 38c.

In the dynamic vibration absorber 20c, the mass body 24 is
The rolling of the wheels 34 causes the wheels 34 to vibrate on the guide rails 22 in accordance with the roll of 2, and thereby the conductors 52 rotate relative to the magnets 38c, and eddy currents are generated in the conductors 52. The relative rotation of the magnet 38c and the conductor 52 is reduced by Joule loss due to the eddy current, and the relative rotation speed is reduced. As a result, the wheels
The rotation of the guide rail 22 is suppressed, the lateral vibration of the guide rail 22 is suppressed via the wheels 34, and the lateral swing of the transporter 12 is suppressed.

FIG. 7 shows a dynamic vibration absorber 20d as a fourth embodiment.
5 is a view as seen from the direction in which the guide rail 22 extends. Dynamic vibration absorber
A view of 20d from the width direction of the guide rail 22 is the same as FIG. 3 in the case of the dynamic vibration absorber 20c. Explaining only the differences from the dynamic vibration absorber 20c, the plurality of magnets 38d are fixed to the axle 50 at equal intervals in the axial direction of the axle 50 between the left and right wheels 34. A plurality of conductors 54 one less than the number of magnets 38d
Is a circle having a diameter equal to that of the magnet 38d, is spaced from the magnet 38d, is located between the magnets 38d, 38d, and penetrates the axle 50 at a center hole having a diameter larger than the diameter of the axle 50; At the upper end, it is connected to the lower surface of the mass body 32.

FIGS. 8 and 9 show the arrangement of magnetic poles on both surfaces of the magnet 38d of FIG. In the magnet 38d, similarly to the magnet 38c in FIGS. 5 and 6, the N and S of the magnetic poles are alternately arranged in the circumferential direction on each surface.
The magnetic poles are opposite on both sides.

In the dynamic vibration absorber 20d, the mass body 24d is
As the wheels 12 roll, the wheels 38 vibrate on the guide rails 22 by rolling, whereby the magnet 38d rotates relative to the conductor 54, and an eddy current is generated in the conductor 54. The relative rotation of the magnet 38d and the conductor 54 is reduced by Joule loss due to the eddy current, and the relative rotation speed is reduced. As a result, the wheels
The rotation of the guide rail 22 is suppressed, the lateral vibration of the guide rail 22 is suppressed via the wheels 34, and the lateral swing of the transporter 12 is suppressed.

In the embodiment, a ropeway is used as a pendulum structure.
Although the ten transporters 12 have been described, the present invention can be applied as a dynamic vibration absorber for any pendulum structure such as a gondola lift and a ski lift other than the transporters 12 of the ropeway 10.

[0028]

According to the present invention (claims 1, 4, and 5), the relative movement between the mass body and the guide rail is suppressed by the eddy current braking force caused by the relative movement between the conductor and the magnet. Therefore, a large suppressing force at the time of a large roll can be ensured, and the mass body can smoothly move relative to the guide rail even with a small roll to generate an accurate eddy current braking force.

In the present invention (claim 1), since the conductor and the magnet for generating the eddy current braking force are respectively provided on the guide rail and the mass body, the structure of the eddy current braking means is simplified.

In the present invention (claims 2 and 3), the yoke is added to increase the magnetic flux density of the magnetic field lines crossing the conductor, so that the eddy current braking force can be increased.

In the present invention (claim 1), the force acting on the mass body in the direction perpendicular to the direction of movement of the mass body is canceled out, so that the movement of the mass body with respect to the guide rail is smooth, and the speed proportional braking characteristic is obtained. Can be improved.

In the present invention (claims 4 and 5), the eddy current braking means is mounted on the mass body, so that the eddy current braking means is reduced in size and the eddy current braking means is easily manufactured.

[Brief description of the drawings]

FIG. 1 is a detailed view of a dynamic vibration absorber as a first embodiment.

FIG. 2 is a detailed view of a dynamic vibration absorber as a second embodiment viewed from above.

FIG. 3 is a view of a dynamic vibration absorber as a third embodiment viewed from a width direction of a guide rail.

FIG. 4 is a view of a dynamic vibration absorber as a third embodiment viewed from a direction in which a guide rail extends.

FIG. 5 is a diagram showing a magnetic pole arrangement on one surface of the magnet of FIG. 4;

6 is a diagram showing a magnetic pole arrangement on the other surface of the magnet of FIG.

FIG. 7 is a view of a dynamic vibration absorber as a fourth embodiment viewed from a direction in which a guide rail extends.

8 is a diagram showing a magnetic pole arrangement on one surface of the magnet of FIG. 7;

FIG. 9 is a diagram showing a magnetic pole arrangement on the other surface of the magnet of FIG. 7;

FIG. 10 is a schematic view of a ropeway equipped with a dynamic vibration absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ropeway (pendulum structure) 12 Carrier 14 Box part (pendulum structure main body) 16 Hanging arm (pendulum structure main body) 18 Cableway 20 Dynamic vibration absorber 22 Guide rail 24 Mass body 32 Mass body main body 34 Wheels 35, 52, 54 Conductor 36 Magnetic body 38a-d Magnet 42 Side wall 50 Axle 58 Projecting wall (conductor, plate-shaped ridge) 60 Yoke

Continuation of the front page (72) Inventor Tomoji Kancho 3-1 Okawa, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture East Railway Vehicle Manufacturing Co., Ltd. In the development headquarters (72) Inventor Yoshizo Otake No. 1 13 Inside Safety Cableway Co., Ltd. (72) Inventor Hiroshi Matsuhisa 1-2-22-27 Hieihei, Otsu City (72) Inventor Masashi Yasuda 10-13 Minami Hatsushima-cho, Amagasaki City Patent Equipment Company, Ltd. (56) Reference Document JP-A-6-280934 (JP, A) JP-A-1-108431 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B61B 12/04 F16F 15/02

Claims (6)

(57) [Claims] A pendulum structure (10) suspended from a cableway (18)
(A) a guide rail attached to the pendulum structure body (14, 16) and extending in the swing direction of the pendulum structure body (14, 16);
(22), (b) a mass body (24) movable along the guide rail (22), and (c) an eddy current caused by a relative speed between the conductor (35) and the magnet (38b). Eddy current braking means for generating a conductor (35) to reduce a relative speed between the two by a Joule loss, wherein the guide rail (22b) is a pair of a pair extending on both sides of the side of the mass body (24b). With side walls (42), each side wall (42)
The conductor (3) on the side facing the side of the mass body (24b).
5), wherein the mass body (24b) has the magnets (38b) on both sides.
A dynamic vibration absorber for a pendulum structure, comprising: 2. The guide rail (22b) is connected to the conductor (35).
The dynamic vibration absorber for a pendulum structure according to claim 1, further comprising a magnetic body (36) on a side opposite to the mass body (24b). 3. The magnet (38b) is connected to the guide rail (22b).
3. The pendulum structure according to claim 1, wherein the mass body (32 b) is attached to a portion of the mass body (32) facing the mass body (24 b), and the mass body (32) is a magnetic material. 4. Dynamic vibration absorber. 4. A pendulum structure (10) suspended from a cableway (18).
(A) a guide rail attached to the pendulum structure body (14, 16) and extending in the swing direction of the pendulum structure body (14, 16);
(22), (b) a mass body (24c) movable along the guide rail (22), and (c) an eddy current caused by a relative speed between the conductor (52) and the magnet (38c). Eddy current braking means for generating a conductor (52) to reduce the relative speed between the two due to Joule loss, wherein the mass body (24c) is a wheel (34) that rolls on the guide rail (22), And an axle (50) attached to both ends of the wheel (34) and rotating integrally with the wheel (34), wherein the conductor (52) rotates integrally with the axle (50). To
The mass of the mass body (24c) is attached to the axle (50), and the magnet (38c) faces the conductor (52) in the axial direction of the axle (50) with a gap on both sides. A dynamic vibration absorber for a pendulum structure, which is attached to a body (32). 5. A pendulum structure (10) suspended from a cableway (18).
(A) a guide rail attached to the pendulum structure main body (14, 16) and extending in the swing direction of the pendulum structure main body (14, 16);
(22), (b) a mass (24d) movable along the guide rail (22), and (c) an eddy current caused by a relative speed between the conductor (54) and the magnet (38d). Eddy current braking means for generating a conductor (54) to reduce the relative speed between the two by the Joule loss thereof, wherein the mass body (24d) is a wheel (34) rolling on the guide rail (22), And an axle (50) attached to both ends of the wheel (34) and rotating integrally with the wheel (34), wherein the magnet (38d) rotates integrally with the axle (50). The conductor (54) is attached to the axle (50), the conductor (54) is sandwiched between the magnets (38d) from both sides in the axial direction of the axle (50), and a gap is provided between the magnet (38d). A dynamic vibration absorber for a pendulum structure, which is attached to the mass body (32) of the mass body (24d) so as to face each other. 6. The pendulum structure body according to claim 1, wherein the guide rail is attached to a suspension arm of the pendulum structure main body. A pendulum structure as described in Crab.