JPH0624239U - Electromagnetic spring clutch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electromagnetic spring clutch with excellent productivity and low manufacturing cost. [Structure] Field core 1 with built-in electromagnetic coil 12
0, an armature 28 arranged in the electromagnetic coil 12, a first rotating shaft 22 arranged in the armature 28, a shaft 20 rotatably supporting the first rotating shaft 22 in the armature 28, a first rotation The second rotary shaft 26 rotatably arranged with respect to the shaft 22, and the first rotary shaft 22 and the second rotary shaft 26 are arranged so as to straddle the outer peripheral surfaces of the electromagnetic coil 12 and
A coil spring that rotates the first rotating shaft 22 and the second rotating shaft 26 together when energized, or releases the first rotating shaft 22 and the second rotating shaft 26 by loosening the winding. In the electromagnetic spring clutch provided with 32, the first rotating shaft 22 is formed of a resin material, and the inner diameter portion 36 in which the shaft 20 of the first rotating shaft 22 is inserted is rotated relative to the shaft 20. An electromagnetic spring clutch in which a fitting portion 38 that is immovably connected is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic spring clutch.

[0002]

[Prior art]

 A conventional electromagnetic spring clutch will be described with reference to FIG. First, the structure will be described. In FIG. 1 (a), 10 is a field core, which is formed of a magnetic material into a cylindrical shape, and its cross-section is formed into a square shape. The coil 12 is fixed. A bearing 14 forming a part of the field core 10 is attached to the central portion of the left end surface of the opposing left and right end surfaces, and the through holes 16 and 18 are provided in the central portion of the bearing 14 and the right end surface, respectively. Has been drilled. The bearing 14 is made of iron-based oilless metal. Reference numeral 20 denotes a shaft. A first rotating shaft 22 made of a non-magnetic material is externally fitted to the shaft 20, and the first rotating shaft 22 is fixed to the shaft 20 with a screw 24. The shaft 20 and the first rotating shaft 22 are inserted through the through holes 16 and 18 of the field core 10.

Reference numeral 26 is a second rotary shaft, which is fitted onto the first rotary shaft 22 and is rotatably arranged in a free state with respect to the first rotary shaft 22. Reference numeral 28 denotes an armature, which is formed into a cylindrical shape by using a magnetic material, is arranged in the electromagnetic coil 12, and is rotatable around the first rotating shaft 22 and the second rotating shaft 26 in the circumferential direction and in the axial direction. It is slidably fitted on the outside. A slit 30 is provided at one end of the armature 28. Reference numeral 32 denotes a coil spring, which is arranged in the armature 28 so as to extend over the outer peripheral surface of the first rotating shaft 22 and the outer peripheral surface of the second rotating shaft 26, and one end of which is a slit 30 of the armature 28. Is locked to. Further, the coil spring 32 is wound so as to be tightened so as to connect the first rotary shaft 22 and the second rotary shaft 26. Reference numeral 34 is a retaining ring for positioning the members such as the field core 10 and the second rotary shaft 18 on the first rotary shaft 22.

Next, the operation will be described. When the electromagnetic coil 12 is not energized, as shown in FIG. 1A, both the first rotating shaft 22 and the second rotating shaft 26 are clamped by the coil spring 32. Further, since no magnetic field is generated in the electromagnetic coil 12, the armature 28 is in a free state with respect to the bearing 14. Therefore, when an external force is applied to the second rotating shaft 26 and the second rotating shaft 26 rotates, the first rotating shaft 22 rotates integrally with the second rotating shaft 26 via the coil spring 32. . This also rotates the shaft 20. At this time, the armature 28 is rotating together with the coil spring 32.

In this state, when the electromagnetic coil 12 is energized, a magnetic field is generated in the electromagnetic coil 12, and as shown in FIG. 1B, a magnetic circuit indicated by a broken line A is formed between the field core 10, the bearing 14, and the armature 28. Once formed, the armature 28 moves leftward due to the magnetic force, and its left end face abuts on the bearing 14. Since the bearing 14 and the left end surface of the armature 28 are in contact with each other, the rotating armature 28 is braked and stopped by the frictional force of the contact surface. At that time, the brake is also applied to one end of the coil spring 32 which is locked in the slit 30 of the armature 28, and a speed difference is generated between the coil spring 32 and the middle portion of the coil spring 32 which is rotating together with the second rotating shaft 26. As a result, the coil spring 32 starts to expand in diameter from one end to the next, and the tightening of the second rotating shaft 26 is loosened. As a result, the connection between the first rotating shaft 22 and the second rotating shaft 26 is released, and the rotation of the first rotating shaft 22 and the shaft 20 is stopped.

[0006]

[Problems to be solved by the device]

 However, the above-mentioned conventional electromagnetic spring clutch has the following problems. In constructing a magnetic circuit, it is desirable to use a non-magnetic material for the first rotating shaft. Conventionally, stainless steel or the like is used for manufacturing, but since it is cut, productivity is poor and cost is low. It gets expensive. In addition, since the bearing constitutes a part of the magnetic circuit, it is necessary to use a magnetic material, and an iron-based oilless metal made of soft iron with excellent magnetization characteristics is used, but at high speeds and high temperatures, Oil spills and shortens the service life. Furthermore, since the first rotating shaft is fixed to the shaft with screws, there is a problem that the first rotating shaft rotates with respect to the shaft due to screw tightening error or the like. Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide an electromagnetic spring clutch that is excellent in productivity and low in manufacturing cost.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration. That is, a field core having a built-in electromagnetic coil, an armature arranged in the electromagnetic coil and movable in the axial direction by being biased by the electromagnetic coil, and a first rotating shaft arranged in the armature. A shaft that is coaxially fitted to the first rotating shaft, is connected to the first rotating shaft so that it cannot rotate relative to the first rotating shaft, and supports the first rotating shaft so as to be rotatable within the armature. A second rotating shaft coaxially with the first rotating shaft and rotatably arranged in a free state with respect to the first rotating shaft; and on the outer peripheral surface of the first rotating shaft in the armature and with the second rotating shaft. The first rotary shaft and the second rotary shaft are arranged on the outer peripheral surface of the second rotary shaft so as to be wound and tightened when the electromagnetic coil is energized, and the first rotary shaft and the second rotary shaft are integrally rotated or wound. To release the rotation of the first and second rotating shafts In the electromagnetic spring clutch including a coil spring for storing, the first rotating shaft is formed of a resin material, and an inner diameter portion of the first rotating shaft into which the shaft is inserted, It is characterized in that a fitting portion is formed so as to be relatively non-rotatably connected to the shaft.

[0008]

[Action]

 The first rotary shaft is made of a resin material, and the fitting portion that is relatively non-rotatably connected to the shaft is integrally molded in the inner diameter portion of the first rotary shaft. Besides being excellent, it eliminates the need for screws when mounting on the shaft.

[0009]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The members having the same configurations as those of the conventional example are designated by the same reference numerals, and the description of the structure and operation thereof will be omitted. 2A and 2B are sectional views showing an embodiment of the electromagnetic spring clutch of the present invention. FIG. 2A is a sectional view when the electromagnetic coil is not energized, and FIG. 2B is a sectional view when the electromagnetic coil is energized. . FIG. 3 is a view of the first rotation shaft of FIG. 2, (a) is a front sectional view, and (b) is a left side view of (a). First, the structure will be described with reference to FIG. A fitting portion 38 is formed in the inner diameter portion 36 of the first rotating shaft 22 arranged in the armature so as to be non-rotatably connected to the shaft 20. Further, the first rotating shaft 22 is manufactured integrally by using a resin material. The bearing 14 attached to the central portion of the left end surface of the field core 10 is made of a metal material having excellent magnetization characteristics, but the first rotating shaft 22 is made of a resin material having high slidability. The metal material does not have to be oilless metal as it is manufactured by At the left end of the shaft 20, there is formed a fitted portion 40 that fits with the fitting portion 38 of the first rotating shaft 22 when the first rotating shaft 22 is externally fitted.

Next, the operation will be described. The operation is almost the same as the above-mentioned conventional example. That is, when the electromagnetic coil 12 is not energized, as shown in FIG. 2A, the first rotary shaft 22 and the second rotary shaft 26 are both tightened by the coil spring 32. Therefore, when an external force is applied to the second rotating shaft 26 and the second rotating shaft 26 rotates, the first rotating shaft 22 rotates integrally with the second rotating shaft 26 via the coil spring 32. To do. Further, since the shaft 20 and the first rotating shaft 22 are connected so that the fitted parts 40 and the fitting parts 38 are fitted to each other and are relatively non-rotatable, the shaft 20 also rotates. .

When the electromagnetic coil 12 is energized in this state, a magnetic circuit indicated by a broken line A is formed between the field core 10, the bearing 14, and the armature 28, as shown in FIG. As a result, it moves to the left and its left end surface contacts the bearing 14, so that the rotating armature 28 is braked and stopped by the frictional force of the contact surface. Then, the coil spring 32 gradually expands in diameter from one end, loosens the tightening of the second rotating shaft 26 and releases the connection between the first rotating shaft 22 and the second rotating shaft 26, and the first rotating shaft 22 And the rotation of the shaft 20 stops.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but the coil spring is wound and tightened when the electromagnetic coil is energized, Needless to say, many modifications can be made without departing from the spirit of the invention, such as an electromagnetic spring clutch in which the first rotating shaft and the second rotating shaft rotate integrally.

[0013]

[Effect of device]

 When the electromagnetic spring clutch according to the present invention is used, the first rotating shaft is made of a resin material, and the inner diameter portion of the first rotating shaft is integrally formed with a fitting portion that is relatively non-rotatably connected to the shaft. Therefore, the productivity is good and the manufacturing cost can be reduced. Further, since it is made of a resin material, it has excellent slidability and has a remarkable effect such that it can be easily attached to the shaft by the fitting portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional electromagnetic spring clutch, FIG. 1A is a cross-sectional view when an electromagnetic coil is in a non-energized state,
(B) is a sectional view when the electromagnetic coil is in the energized state.

FIG. 2 is a cross-sectional view showing an embodiment of the electromagnetic spring clutch of the present invention, in which (a) is an electromagnetic coil in a non-energized state,
(B) is a sectional view when the electromagnetic coil is in the energized state.

3 is a view of the first rotating shaft of FIG. 2, (a) is a front sectional view, and (b) is a left side view of (a).

[Explanation of symbols]

 10 field core 12 electromagnetic coil 20 shaft 22 first rotating shaft 26 second rotating shaft 28 armature 32 coil spring 36 inner diameter portion 38 fitting portion

Claims (1)

[Scope of utility model registration request] 1. A field core having a built-in electromagnetic coil, an armature which is arranged in the electromagnetic coil and is axially movable by being biased by the electromagnetic coil, and a first rotating shaft arranged in the armature. And a shaft which is coaxially fitted to the first rotating shaft, is connected to the first rotating shaft so as not to rotate relative to the first rotating shaft, and supports the first rotating shaft so as to be rotatable in the armature. A second rotating shaft coaxial with the first rotating shaft and rotatably arranged in a free state relative to the first rotating shaft; and on an outer peripheral surface of the first rotating shaft in the armature. The second rotary shaft is arranged over the outer peripheral surface and is wound when the electromagnetic coil is energized, and the first rotary shaft and the second rotary shaft are integrally rotated or wound. Loosen to release the integral rotation of the first and second rotary shafts An electromagnetic spring clutch comprising: a coil spring for storing the first rotating shaft, the first rotating shaft being formed of a resin material, and the inner diameter portion of the first rotating shaft, into which the shaft is inserted, having a shaft. An electromagnetic spring clutch, wherein a fitting portion is formed so as to be relatively non-rotatably connected to the electromagnetic spring clutch.