JPH02276457A - Manufacture of hysteresis clutch brake - Google Patents

Abstract

PURPOSE:To reduce leakage flux and to improve economy and machining efficiency by forming axial groove sections, with same interval, in the circumferential direction, in at least one of inside or outside pole structure to be arranged on a coupling main body by means of a gear cutting machine. CONSTITUTION:Recessed groove sections are formed, by means of a gear cutting machine, in the outer circumferential face of an inside pole structure 1a and the inner circumferential face of an outside pole structure 1b facing therewith. Radial thickness of the annular pole structures 1a, 1b is set as required actually, then the inner and outer circumferential sides thereof are cut in to form groove sections 3c, 3d having tooth-type cross section entirely in the axial direction. Since excessive cutting work at iron portion is not required, machining process is shortened thus realizing high saving effect of resource and energy. Since the gear cutting machine has higher machining accuracy than drilling machine, fluctuation of pole width W is suppressed and the cutting depth H can be set to a random value.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a hysteresis clutch/brake,
In particular, the present invention relates to a method of manufacturing an inner pole structure and an outer pole structure disposed on a first connecting body.

[Prior Art] An inner pole structure and an outer pole structure formed on a first connecting body and arranged facing each other across a gap, and an excitation coil that circulates magnetic flux through the inner pole structure and the outer pole structure. , a hysteresis clutch or a hysteresis brake consisting of a hysteresis member fixed to the second connecting body, located in the gap between the inner pole structure and the outer pole structure, and facing both pole structures with a gap therebetween; It has been known for a long time.

FIGS. 2 and 3 show the structure of a conventional hysteresis brake device. In the figure, (1) is an inner pole structure (la) whose radial hand portion has a U-shape in the cross-sectional shape along the central axis, and which faces within the opening of this U-shaped portion with a gap G in between. and outer pole structure (1
b) shows the yoke which is the first connecting body formed.

This yoke (1) is fixed to a stationary part (not shown).

Inside the U-shaped portion of the yoke (1) is an excitation coil (
2) is stored. Furthermore, an inner pole structure (1a) and an outer pole structure (1b) forming the gap G are also provided.
As shown in FIG. 3, substantially semi-cylindrical recesses (3a) and (3b), which are pole grooves, are arranged at equal intervals in the circumferential direction on the opposing surfaces of the opposite surfaces ( 3a),
(3b) are formed in a staggered manner with respect to each other.

On the other hand, a hysteresis member (4) made of a disk-shaped ferromagnetic material having a flange-like cylindrical portion (4a) is arranged such that the cylindrical portion (4a) is located approximately in the center of the gap G, The disk portion (4b) is attached to the support (5) with rivets or the like. This support (5) is made of non-magnetic material and has a drive shaft (6) extending through its center.
(The drive shaft (6) is arranged on the central axis of the yoke (1), which is the first connection main body, and is located in the front and rear sides within the central opening of the yoke (1). The yoke (1) is rotatably supported by two bearings (7) and (8).In addition, when the hysteresis member (4) is attached to the support (5), the hysteresis member (4) is The center axis of rotation is naturally the drive shaft (
6). A cover (9) is provided on the outer peripheral edge of the support (5) so as to wrap around the side surface of the U-shaped opening of the yoke (1).
are fixed with rivets or the like, and the support (5) including this cover (9) constitutes the second connecting body. The bearing (7) located on the side of the U-shaped opening within the central opening of the yoke is held between one step within the central opening of the yoke (1) and the support (5). The bearing (8) on the opposite side is held by the other step and is prevented from moving in the axial direction with respect to the yoke (1) and the drive shaft (6) by snap rings (lO) and (It).

A conventional hysteresis brake is configured as above,
When the drive shaft (6) rotates, the support (5), hysteresis member (4) and cover (9) move together with the drive shaft (6).
) rotates in one body. When the excitation coil (2) is excited at this time, magnetic flux flows in the yoke (1) as shown by Φ in Figure 2, and different poles are generated in each boat structure (la) and (Ib). Therefore, the cylindrical part (4) of the hysteresis member (4)
In a), magnetic flux flows in the direction shown by arrow A in FIG. Therefore, the cylindrical part (
A hysteresis loop is drawn in 4a), and a transmitted torque proportional to its area acts on the yoke (1) as a braking torque. This hysteresis brake is suitable for tension control, speed control, etc. because the transmitted torque can be easily controlled by exciting current and it exhibits constant slip characteristics.

By the way, when the recesses (3a) and (3b), which are the pole grooves of the inner pole structure and the outer pole structure arranged in the first connecting body in the hysteresis brake, are processed by a multi-axis pole machine, each pole structure It is necessary to provide the iron part of the body in excess of the iron part that is actually required, that is, it is necessary to provide an extra part on the outside for the inner pole structure (la) and on the inside for the outer pole structure (Ib). be.

This is because, without this extra thickness, the drill for drilling the holes would run away and the drilling would not be possible. Therefore, the yield of iron raw materials is poor, the iron part is cut intermittently, resulting in poor workability, the life of the cutter is shortened, and furthermore, it is necessary to remove burrs after cutting, resulting in reduced resource and energy savings. There are many drawbacks from this point of view. In addition, the pole width shown in Figure 3 and the cutting depth shown by H have a large effect on the performance of the hysteresis brake.
In the case of machining using a pole machine, there is a problem that the machining accuracy is rough, resulting in variations in pole width (L), resulting in large variations in transmitted torque between products.

In addition, in such drilling, the depth of cut (H)
If the diameter is increased, a portion with a reduced cross-sectional area will appear in the convex part of the pole structure as shown in Figure 4, and the magnetic resistance will increase, making it impossible to make the cut depth sufficiently large, and thus reducing the leakage magnetic flux. There are problems such as not being able to obtain the desired transmission torque and consuming a large amount of ineffective power.

Note that the same situation applies to the hysteresis clutch. Therefore, for example,
As disclosed in the above publication, it has been proposed to form concave pole grooves by cutting rather than drilling.

[Problems to be Solved by the Invention] When machining the concave pawl grooves of the inner pole structure and the outer pole structure disposed on the first connecting body in a hysteresis clutch/brake using a multi-axis pole machine, the above-mentioned There are various problems such as. In addition, even if the above-mentioned pole groove is machined by cutting rather than drilling to solve this problem, if a broaching machine is used, the diameter of the pole structure should be increased to increase the transmission capacity of the hysteresis clutch/brake. In this case, a new broach is required depending on the diameter of the pole, which means that expensive broaches must be prepared for each type of hysteresis clutch/brake, which is extremely uneconomical.

Furthermore, when using a milling machine, machining the tooth profile is difficult, so there is a problem in that the machining time is extremely long.

This invention was made to solve the above problems, and is the first in hysteresis clutch/brake.
In the manufacture of pole structures arranged on the connecting body of
The purpose of the present invention is to provide a manufacturing method that is economical and has high processing efficiency, which can save resources and energy, reduce variations between products, and minimize leakage magnetic flux.

[Means for Solving the Problems] A method for manufacturing a hysteresis clutch/brake according to the present invention provides a first method for manufacturing a hysteresis clutch/brake.
Concave grooves in the axial direction are formed at equal intervals in the circumferential direction by a gear cutter in at least one of the inner pole structure and the outer pole structure disposed in the connecting body of the motor.

[Operation] In this invention, the concave grooves of the inner pole structure and the outer pole structure disposed in the first connecting body of the hysteresis clutch/brake are machined by a gear cutting machine. There is no need to provide an extra iron part as in the case, the yield of iron raw materials is improved, and the work process is shortened. In addition, since the machining accuracy is good, the variation in pole width is small, and the depth of cut can be set to any value by changing the module of the gear cutter, shift coefficient, etc., so leakage magnetic flux can be minimized. Moreover, since the process is performed using a gear cutting machine, it is economical and the process time is short.

[Example] FIG. 1 is a cross-sectional view of a main part of a hysteresis brake manufactured by the manufacturing method according to the present invention.

The basic structure and operation of the hysteresis brake according to this embodiment are similar to the conventional devices shown in FIGS. 2 and 3 described above. Therefore, it is the same as the conventional device mentioned above.
Otherwise, descriptions of corresponding parts will be omitted.

In this embodiment, the inner pole structure (la) and the outer pole structure (lb) are arranged facing each other, with a cylindrical part (4a) of the hysteresis member being arranged with a gap therebetween. A concave groove is formed by a gear cutter on the outer peripheral surface of the inner pole structure (la) and the inner peripheral surface of the outer pole structure (lb) opposing thereto. At that time, the radial thickness of the annular pole structures (la) and (lb), which are iron parts, is processed to the actually required thickness, and the outer and inner circumferential sides are machined using a gear cutter (not shown). By cutting an arbitrary number of grooves (3c) and (3d) having a tooth-shaped cross section as shown in FIG.

If the grooves are machined using a gear cutting machine in this way, there is no need to provide an extra iron part unlike when machining using a pole machine, and there is no need to cut that extra iron part, so the work process can be shortened. ,Therefore, it is highly effective in terms of resource and energy conservation.

Furthermore, since the gear cutting machine has better processing accuracy than the pole machine, variations in the pole width (L) are reduced, and the cutting depth (H) can be set to an arbitrary value. Moreover, it is possible to eliminate the uneconomical cost of preparing a large number of expensive broaches as in the case of using a broaching machine, and it is also possible to shorten the machining time compared to the case of using a milling machine.

In addition, the pole structure (LA) is cut by a gear cutter.

The tooth-shaped groove portion (3c) formed in (lb).

(3d) is a concave groove on the tip circle (3c)
, (3d) is the width of the convex part between the grooves on the tip circle (
L), and the tooth height (H) can be set to be larger than half of the groove width. In addition, the tooth profile shape can be such that the cross-sectional area of the convex portion is uniform from the tooth tip to the tooth root, or the cross-sectional area can be made to increase from the tooth tip to the tooth root. can.

Also, although I have talked about hysteresis brakes above,
This invention can be similarly applied to hysteresis clutches.

[Effects of the Invention] As described above, according to the present invention, by forming the grooves of the inner pole structure and the outer pole structure disposed in the first connecting body using a gear cutter, the yield of iron raw materials can be improved. In addition, the work process can be shortened, resulting in significant resource and energy savings. In addition, since a gear cutter is used, the machining accuracy is high and the variation in pole width is small, which reduces the variation in transmitted torque between products. In addition, deep grooves can be easily and efficiently machined without using special processing tools or jigs and without reducing the magnetic path area on the way from the tip to the root of the pole structure. It is possible to manufacture a hysteresis clutch/brake that has small leakage magnetic flux and can obtain maximum transmission torque.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing the pole structure of a hysteresis brake according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a conventional hysteresis brake, and FIG. 3 is a cross-sectional view of FIG.
(2) Partial sectional view taken along the line. FIG. 4 is a partial sectional view illustrating a case where the depth of cut in FIG. 3 is increased. (1) is the yoke (first connection main body), (1a) is the inner pole structure, (lb) is the outer pole structure, (2) is the excitation coil, (3c) and (3d) are the grooves, (4 ) is a hysteresis member, and (4a) is a cylindrical portion. Note that the same reference numerals in each figure indicate the same or corresponding parts. Fig. 1 Agent Masuo Oiwa 1a = Inner ball structure 1b: Outer pole structure 3c: Groove 3d: Groove 4a = Cylindrical part (hysteresis member) Fig. 4 a a a 1: Yoke (first 2: Excitation coil 4: Hysteresis member procedural amendment 5, date of amendment order 6, subject of amendment Detailed description of the invention in the specification and Figure 3 7 of the drawings, contents of amendment (1) In the third to fourth lines of the last page of the specification, the words "each boat" are corrected to "each pole." (2) Figure 3 is corrected as shown in the attached sheet. 3. Relationship with the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4 Agent address Marunouchi, Chiyoda-ku, Tokyo 2-2-3

Claims (1)

[Claims] (1) An inner pole structure and an outer pole structure formed in the first connecting body and arranged facing each other across a gap, an excitation coil that circulates magnetic flux through the inner pole structure and the outer pole structure, and In the hysteresis clutch/brake, the hysteresis clutch/brake comprises a hysteresis member that is fixed to a connecting body of 2 and is located in a gap between the inner pole structure and the outer pole structure and faces both pole structures with a gap therebetween. A method of manufacturing a hysteresis clutch/brake, which comprises forming concave grooves in the axial direction at equal intervals in the circumferential direction on at least one of the pole structure and the outer pole structure using a gear cutter.