JP2002070990A - Pulley with electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulley with an electromagnetic clutch having a plate spring used for connection between an input part and an output part, capable of preventing fretting abrasion essentially. SOLUTION: This pulley with the electromagnetic clutch is equipped with a rotor 30 for rotating synchronously with a rotation axis 6, a pulley 32 mounted rotatably on the rotation axis through a bearing 17, an armature 34 mounted movably on the pulley in the axial direction, an electromagnet 36 capable of interrupting the connection between the armature and the rotor, and the plate spring 38 for connecting the armature to the pulley. The plate spring 38 has elasticity in the axial direction and in the radial direction, and has rigidity capable of transmitting an axial torque in the rotation direction. Even when the clutch is connected in the state where a tension of a belt or the like works on the pulley 32 and the armature 34 is decentered as much as a gap portion and simultaneously absorbed (connected) onto the rotor 30, the pulley 32 is returned in the canceling direction of the decentering by an elastic force in the radial direction of the plate spring 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pulley with an electromagnetic clutch.

[0002]

2. Description of the Related Art FIG. 4 is a structural view of a conventional pulley with an electromagnetic clutch disclosed in Japanese Utility Model Laid-Open No. 62-156656. In this figure, 2 is a fixed conical wheel, 3 is a moving conical wheel, 4 is a V groove, 5 is an endless V belt, 6 is a shaft, 7 is a slide key, 8 is a disc spring, 9 is a pulley assembly, and 10 is a coil. ,
11 is a stator, 12 is a rotor, 13 is a bearing, 14 is a lining part, 15 is a clutch assembly, 16 is a central shaft body,
17 and 18 are bearings, 19 is a key, 20 is a leaf spring, 21 is an armature, 22 is a bolt material, and 23 is a pin material.

In this pulley with an electromagnetic clutch, a leaf spring 20 is alternately fixed to a fixed conical wheel 2 and an armature 21 along a circumferential direction. An appropriate gap is formed between the armature 21 and the lining portion 14 of the rotor 12 facing the armature 21 to which the fifteen rotors 12 are fixed.

[0004] With this configuration, the output is interrupted by the armature 21 responding to the excitation or the specific excitation of the coil in the stator.
Is achieved by pressing or separating the rotor 12 from the rotor 12. Also, at the time of this intermittent operation, a part of the leaf spring 20 alternately stopped by the fixed conical wheel 2 and the armature 21 bends in the axial direction, thereby enabling the axial movement of the armature 21 while transmitting the axial torque. ing.

[0005]

As described above, in the conventional pulley with an electromagnetic clutch, the input portion (the pulley assembly 9) and the output portion (the center shaft body 16) are plates having a degree of freedom only in the axial direction. They are connected by a spring 20. Further, there is also known one connected by an elastic body (for example, rubber) instead of a leaf spring.

However, the bearings 17 and 18 have a small clearance e.
When the clutch is connected in a state where tension is applied to the belt 5, the armature 2
1 is attracted to the rotor 12 while being eccentric. In this case, since the leaf spring 20 bends in the axial direction but does not bend in the radial direction and the circumferential direction, the bearings 17 and 18 remain eccentric (a) and (b) as schematically shown in FIG. (C) (d)
Rotate like. In this state, the bearings 17, 18
The bearing ball 1 located on the side where there is no gap cannot rotate, and the tension of the belt 5 acts upon every rotation of the clutch. May cause abrasion. Such wear is called fretting wear.

When an elastic body (rubber) is used in place of the leaf spring 20, this phenomenon can be avoided, but the deformation in the circumferential direction increases and the elastic body is repeatedly deformed. Cracking and hardening occur in a short time, and the life of the elastic body is greatly reduced.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a pulley with an electromagnetic clutch in which the connection between the input portion and the output portion is a leaf spring and which can essentially prevent fretting wear.

[0009]

According to the present invention, a rotor (30) rotating in synchronization with a rotating shaft (6), and a pulley rotatably mounted on the rotating shaft via a bearing (17). (32), an armature (34) attached to the pulley so as to be movable in the axial direction, an electromagnet (36) capable of intermittently connecting the armature and the rotor, and a leaf spring (38) connecting between the armature and the pulley. And the leaf spring (3
8) is provided with a pulley with an electromagnetic clutch, which has elasticity in the axial direction and the radial direction, and has rigidity capable of transmitting an axial torque in the rotational direction.

According to the configuration of the present invention, the leaf spring (3
8) has elasticity in the axial direction and rigidity capable of transmitting axial torque in the rotational direction, so the electromagnet (36) is turned on.
By doing so, the armature (34) can be suctioned in the axial direction and connected to the rotor (30). At this time (ie, when the clutch is connected), the shaft torque between the armature (34) and the pulley (32) can be transmitted via the leaf spring (38).

Further, even when the clutch is connected in a state where the tension of the belt or the like is acting on the pulley (32) and the armature (34) is eccentrically adsorbed to the rotor (30) by the clearance, According to the configuration of the present invention, since the leaf spring (38) has elasticity in the radial direction, the pulley (32) can be returned in a direction to eliminate the eccentricity by the elastic force. Therefore, the ball for the bearing located on the side where there is no gap in the bearing can also rotate immediately,
Fretting wear can be essentially prevented.
Therefore, even when the clutch is eccentric, the output portion (shaft) can be maintained concentrically, and no extra load is applied to the bearing. Further, since there is rigidity in the circumferential direction, a sufficient torque can be transmitted.

According to a preferred embodiment of the present invention, the leaf spring (38) has an armature mounting portion (38a) pivotally mounted on the armature (34) and a pulley mounting portion pivotally mounted on the pulley (32). (38b) and a flat plate portion (38c) having both ends fixed to the armature mounting portion (38a) and the pulley mounting portion (38b), and at least one of the armature mounting portion (38a) and the pulley mounting portion (38b). Has flexibility in the axial direction, and the flat plate portion (38c) has flexibility in the radial direction.

With this configuration, a leaf spring (38) having elasticity in the axial and radial directions and having rigidity capable of transmitting an axial torque in the rotational direction can be realized with a simple configuration.

The armature mounting portion (38)
a), the flexibility of the pulley mounting portion (38b) and the flat plate portion (38c) is due to the elastic deformation of the plate member. With this configuration,
The leaf spring (38) can be formed as an integral part.

[0015]

Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is an overall configuration diagram of a pulley with an electromagnetic clutch according to the present invention. As shown in this figure, the pulley with an electromagnetic clutch of the present invention includes a rotor 30, a pulley 32, an armature 34, an electromagnet 36, and a leaf spring 38. The rotor 30 is attached by a pin 31 a (or a key or the like) so as not to rotate relative to the rotating shaft 6 via the rotating shaft body 31, and rotates in synchronization with the rotating shaft 6.
The rotor 30 is preferably in the shape of a disk made of a magnetically permeable material, and is configured concentrically with the rotating shaft 6.

The pulley 32 is attached to the rotary shaft 6 via the rotary shaft 31 and the bearing 17 so as to be rotatable about the axis of the rotary shaft 6. The pulley 32 has a plurality of Vs in this example.
Although it is a multi-row V pulley for hanging a belt, the present invention is not limited to this, and may be a speed change pulley as disclosed in Japanese Utility Model Laid-Open No. 62-156656.

The armature 34 is mounted on the pulley 32 so as to be movable in the axial direction. This armature 34
Is formed of a material that can be attracted by the electromagnet 36, for example, iron. In this example, the electromagnet 36 is attached to the outer peripheral portion of the rotating shaft body 31 and passes through the rotor 30 to the armature 3.
4 and the armature 34 and the rotor 30 are energized by O
The connection / disconnection is performed by N-OFF. In addition,
The electromagnet 36 is fixed to an external fixed part, and the rotating shaft 3
It is preferable that the motor 1 is configured to idle. With this configuration, the electric cord for energizing the electromagnet 36 can be connected without a slip ring, and ON-OFF of energization can be easily performed.

FIG. 2 is a view (A) taken along the line AA of FIG. 1 and a conventional example (B) thereof. As shown in FIG. 2A, a leaf spring 38 connects between the armature 34 and the pulley 32.
In this example, the leaf spring 38 is connected to the armature 34 by the pin 3.
Armature mounting part 38a pivotally mounted at 4a
And a pulley mounting portion 38b pivotally attached to the pulley 32 by a pin 32a, and a flat plate portion 38c having both ends fixed to the armature mounting portion 38a and the pulley mounting portion 38b.

At least one of the armature mounting portion 38a and the pulley mounting portion 38b has flexibility in the axial direction. Further, the flat plate portion 38c has flexibility in the radial direction. Note that, in this example, the armature mounting portion 38a and the pulley mounting portion 38b are integrated components formed of a flat plate member perpendicular to the rotation axis, and the flat plate portion 38c is formed of a flat plate member parallel to the rotation axis. With this configuration, the plate spring 38 has elasticity in the axial and radial directions due to elastic deformation of the plate member, and has rigidity capable of transmitting an axial torque in the rotational direction. Also,
Reference numeral 39 in FIG. 2 denotes a cushion material fixed to a part of the armature 34, and the armature 34 and the rotor 3
The sound of collision with zero is reduced. The cushion material 39 is preferably made of rubber or polymer having elasticity.

FIG. 2B shows a conventional example.
However, it is composed of only a flat plate member parallel to the rotation axis, and has the same elasticity in the axial direction and rigidity in the rotation direction,
High rigidity and little elasticity in the radial direction.

FIG. 3 is a view showing another embodiment of the leaf spring 38. In this figure, (A) is a diagram of the first embodiment, (B)
Is a diagram of the second embodiment, and (C) is a diagram of the third embodiment.

The leaf spring 38 in the first embodiment shown in FIG. 3A is shown in FIG. 2, and connects the armature mounting portion 38a and the pulley mounting portion 38b to positions shifted from the axis in the same direction. The flat plate portion 38c is configured as described above. According to this configuration, the plate member has a large rigidity in the compression direction between the mounting portions 38a and 38b, that is, the axial torque in the rotation direction in the electromagnetic clutch, and has an appropriate flexibility in the radial direction due to elastic deformation of the plate member. Have.

The leaf spring 38 in the second embodiment shown in FIG. 3B is substantially the same as the first embodiment, except that the mounting portions 38a and 38b are larger and the flat plate portion 38c is smaller. I have. With this configuration, the mounting portions 38a, 38
The flexibility in the axial direction b (the direction perpendicular to the plane of the drawing in this figure) can be set large.

In the leaf spring 38 according to the third embodiment shown in FIG. 3C, the armature mounting portion 38a and the pulley mounting portion 3
The flat plate portion 38c is formed obliquely so as to connect positions shifted in the opposite direction from the axis of 8b. With this configuration, the flexibility of the mounting portions 38a and 38b in the axial direction (the direction perpendicular to the paper surface in this drawing) is set to be large, and
The deformation due to the axial torque in the compression direction (rotation direction in the electromagnetic clutch) between 8a and 38b can be symmetrical.

According to the configuration of the present invention described above, the leaf spring 3
8 has elasticity in the axial direction and rigidity capable of transmitting an axial torque in the rotational direction. Therefore, by turning on the electromagnet 36, the armature 34 can be attracted in the axial direction and connected to the rotor 30. it can. At this time (that is, when the clutch is connected), the shaft torque between the armature 34 and the pulley 32 can be transmitted via the leaf spring 38.

Further, even if the clutch is connected while the pulley 32 is being tensioned by a belt or the like and the armature 34 is eccentrically adsorbed to the rotor 30 by the clearance, the structure of the present invention can be applied. For example, since the leaf spring 38 has elasticity in the radial direction, the elastic force can return the pulley 32 in a direction to eliminate the eccentricity. Therefore, the ball for the bearing located on the side where there is no gap in the bearing can immediately rotate, and the fretting wear can be essentially prevented. Therefore, even when the clutch is eccentric, the output portion (shaft) can be maintained concentrically, and no extra load is applied to the bearing. Further, since there is rigidity in the circumferential direction, a sufficient torque can be transmitted.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0029]

As described above, the pulley with an electromagnetic clutch according to the present invention has an excellent effect that the connection between the input portion and the output portion is a leaf spring and fretting wear can be essentially prevented. Having.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a pulley with an electromagnetic clutch of the present invention.

FIGS. 2A and 2B are views (A) of FIG. 1 and a conventional example thereof (B).
It is.

FIG. 3 is another embodiment view of the leaf spring 38;

FIG. 4 is a configuration diagram of a conventional pulley with an electromagnetic clutch.

FIG. 5 is an explanatory diagram of fretting wear.

[Explanation of symbols]

1 ball, 2 fixed cone wheel, 3 moving cone wheel, 4 V
Grooves, 5 endless V-belts, 6 axes, 7 sliding keys, 8
Disc springs, 9 pulley assemblies, 10 coils, 11 stators, 12 rotors, 13 bearings, 14 lining parts, 15 clutch assemblies, 16 central shafts, 17, 1
8 bearing, 19 key, 20 leaf spring, 21 armature, 22 bolt material, 23 pin material, 30 rotor,
32 pulley, 34 armature, 36 electromagnet, 3
8 leaf spring, 38a armature mounting portion, 38b pulley mounting portion, 38c flat plate portion, 39 cushion material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Tanaka 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima-Harima Heavy Industries, Ltd. Tokyo Engineering Center F-term (reference) 3J031 BA19 CA03

Claims (3)

[Claims] 1. A rotor (30) rotating in synchronization with a rotating shaft (6), a pulley (32) rotatably mounted on the rotating shaft via a bearing (17), and an axial direction An armature movably mounted on the armature; an electromagnet capable of intermittently connecting the armature and the rotor;
A leaf spring (38) connecting the armature and the pulley, wherein the leaf spring (38) has elasticity in an axial direction and a radial direction, and has a rigidity capable of transmitting an axial torque in a rotational direction.
A pulley with an electromagnetic clutch, characterized in that: 2. The armature mounting portion (38a) pivotally connected to the armature (34).
And a pulley mounting portion (38) pivotally attached to the pulley (32).
b) and a flat plate part (38c) having both ends fixed to the armature mounting part (38a) and the pulley mounting part (38b), and at least one of the armature mounting part (38a) and the pulley mounting part (38b) is formed. It has flexibility in the axial direction,
The pulley with an electromagnetic clutch according to claim 1, wherein the flat plate portion (38c) has flexibility in a radial direction. 3. The electromagnetic device according to claim 2, wherein the flexibility of the armature mounting portion (38a), the pulley mounting portion (38b) and the flat plate portion (38c) is due to elastic deformation of the plate member. Pulley with clutch.