JPS6326533A - Magnetic signal generating ring - Google Patents

Abstract

PURPOSE:To obtain a ring for magnetic signal generation which has good durability and is easy to handle at low cost by providing a magnetic body ring formed by dispersing a magnetic material in a synthetic resin material and a metallic ring for reinforcing the ring. CONSTITUTION:The metallic ring 7 for reinforcement which is made of nonmagnetic metal is mounted on the outer peripheral surface 6 of a magnetic body spur gear 2 which is annular and has teeth 2a formed at its outer periphery, thereby forming the ring 1 for magnetic signal generation. This ring 1 is pressed onto the outer periphery of an annular boss and a magnetic sensor 29 is arranged at a position adjacent to the outer peripheral surface of the ring 1. Further, the ring 1 uses a mixed material of synthetic resin and a high- magnetic-permeability material and is formed as a gear which has plural teeth 2a projected on the outer peripheral surface at equal intervals. Then, the magnetic sensor 29 has a magnetized core material 30 and a coil 31 wound around it and generates and sends a magnetic signal corresponding to the teeth 2a passing nearby the core material 30 to a coil 31, thereby detecting the rotating speed of a wheel disk.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic signal generating ring that is attached to a rotating member and generates a magnetic signal by cooperating with a magnetic sensor.

<Prior Art> Conventionally, in order to measure the rotational speed of a wheel for skid control or other purposes of a vehicle, gears or magnet rings magnetized with alternating poles at equal intervals have been attached to the outer circumferential surface of the wheel. ,
The rotational speed of the wheel is detected by a magnetic sensor provided adjacent to the outer periphery of the wheel by obtaining a magnetic signal as the teeth of the gear or the poles of the magnet ring pass. Such magnetic signal generating gears and magnet rings, such as ring-shaped external gears, are generally fixed by being coaxially press-fitted into a portion of the wheel. However, since it is necessary to ensure the strength necessary for press-fitting and to pay great attention to adjusting the press-fitting allowance, there is a problem in that the manufacturing cost is relatively high.

Furthermore, various resin magnets are known in which a highly permeable material is dispersed in a synthetic resin, and since these can be easily molded, they can be formed into an annular gear or a magnet ring at low cost. However, when this resin magnet is used alone as a magnetic signal generating ring, its strength is insufficient, so it may break due to stress during press-fitting, and there are problems with durability after mounting.

<Problems to be Solved by the Invention> In view of these problems of the prior art, the main object of the present invention is to provide a magnetic signal generating ring that is low in cost, has good durability, and is easy to handle. There is a particular thing.

Means for Solving the Problems According to the present invention, such an object is achieved by using a magnetic signal generating device mounted on a rotating body to generate a magnetic signal by cooperating with a means for detecting changes in magnetic flux. This is achieved by providing a magnetic signal generating ring characterized by having a magnetic ring made of a synthetic resin material with a magnetic material dispersed therein, and a metal ring reinforcing the magnetic ring. Ru.

<Function> In this way, the resin magnetic material can be protected by the reinforcing metal ring, and handling during press-fitting becomes easier, improving assembly workability and durability after assembly. Significantly improved.

Embodiments The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 shows a non-drive wheel support structure equipped with a magnetic signal generating ring according to the present invention. An annular boss 22 is integrally provided at the center of a wheel disc 20 having a flange 21 for a disc brake, protruding toward the center of the vehicle body. The inner peripheral surface of the center hole of this annular post 22 is rotatably supported by an axle spindle 26 via tapered bearings 24,25. This wheel disc 20 is held against the axle spindle 26 by a nut 28. Note that the reference numeral 23 indicates a wheel bolt for screwing a wheel (not shown).

The magnetic signal generating ring 1 according to the present invention is press-fitted onto the outer periphery of a post 22 of a wheel disk 20, and a magnetic sensor 29 is fixed to a portion of the vehicle body adjacent to the outer periphery.

Figures 2 to 4 show the operating principle of the magnetic signal generation ring. In Figure 2, the magnetic signal generation ring 1 is made of a mixture of synthetic resin and high magnetic permeability material, and The magnetic sensor 29 is formed as a magnetic spur gear 2 having a plurality of teeth 2a protruding from its surface at equal intervals, and the magnetic sensor 29 is connected to a magnetized core material 3.
0 and a coil 31 wound around the core material, and generates a magnetic signal corresponding to the number of teeth 2a of the magnetic spur gear 2 passing near the core material 30 as the magnetic spur gear 2 rotates. coil 3
1 and detects the rotational speed of a magnetic signal generating ring 1, that is, a wheel disk 20, to which a magnetic spur gear 2 is attached.

Here, as shown in FIG. 3, a magnetic crown gear 3 is used in which the teeth 3a of the gear are formed to face the end face in the axial direction of the rotating body, and magnetic signals are transmitted from the axial direction of the rotating body. Detection may also be performed.

Further, as shown in FIG. 4, instead of the magnetic spur gear 2, a resin magnet ring 4 in which alternating poles are arranged and magnetized at equal intervals on the outer peripheral surface, and a U-shaped core material 40 are used. The coil 41 transmits a magnetic signal caused by a change in magnetic pole passing near both ends of the coil 41.
The rotational speed of the wheel disk 20 may be detected using the sensor 39 that is generated during the rotation. The resin magnet rings 4 are arranged and magnetized at equal intervals on the end face in the axial direction of the rotating body rather than on the outer peripheral surface, and the magnetic signals can be detected from the axial direction in the same way as the magnetic crown gear 3 described above. You may do so.

5 and 6 show a first embodiment of a ring for generating a magnetic signal according to the present invention. In the case of this embodiment, a magnetic material is formed in an annular shape and has teeth 2a formed on its outer periphery. A reinforcing metal ring 7 made of a non-magnetic metal is attached to the outer peripheral surface 6 of the spur gear 2 to form the magnetic signal generating ring 1.
It is formed as. This magnetic signal generating ring 1 is press-fitted onto the outer periphery of the annular boss 22, and a magnetic sensor 29 is disposed adjacent to the outer periphery of the ring (FIG. 1). This reinforcing metal ring 7 can suppress the deformation of the magnetic spur gear 2 in the ring radial direction due to press-fitting pressure, making it possible to maintain the ring 1 in an optimal state. 2 protection is ensured. Furthermore, since the magnetic spur gear 2 is made by kneading synthetic resin such as thermoplastic polyamide or polyolefin with high magnetic permeability material such as soft ferrite or iron, it can be formed into a desired shape by molding. can. Here, the number of teeth 2a of the magnetic spur gear 2 is desirably 10 or more, preferably 25 to 100 teeth. Further, the mixing ratio of the synthetic resin and the high magnetic permeability material constituting the magnetic spur gear 2 is in the range of 40/60 to 3/97, preferably in the range of 20/80 to 8/92, by weight. This is desirable.

It is desirable that the maximum magnetic permeability of the magnetic spur gear 2 formed in this manner is 5 or more, preferably 10 or more.

7 and 8 show a second embodiment of the present invention, in which a crown gear is provided in place of the above-described magnetic spur gear 2 with teeth 3a facing the end face in the axial direction. The operation and effect are the same as in the first embodiment except that a magnetic crown gear 3 having a shape is used and magnetic signals are detected from the axial direction of the ring 1. 'In the case of this embodiment, the inner circumferential surface 5 may be used to fit the boss 22 onto the outer circumferential surface of the boss 22 as shown by the solid line in FIG. It is also possible to fit into the inner peripheral surface of the wheel disc 20 as shown in FIG. In the case of the type in which the reinforcing metal ring 7 that comes into contact with the inner circumferential surface of the wheel disk 20 is made of metal, the press-fitting allowance can be made small, so that the reinforcing metal ring 7 that comes into contact with the inner circumferential surface of the wheel disc 20 is made of metal. This makes it possible to minimize the impact of

9 and 10 show a third embodiment of the present invention, in which instead of the above-mentioned magnetic spur gear 2, a resin magnet ring 4 magnetized with alternating poles along the circumferential direction is used. The functions and effects are the same as those of the first embodiment shown in FIGS. 5 and 6 and the second embodiment shown in FIGS. 7 and 8, except that they are used. In the case of this embodiment, even if the resin magnet ring 4 is magnetized on the outer circumferential surface, @ on the end surface in the axial direction is
It may be magnetic. If the end surface in the axial direction is magnetized, it may be fitted onto the outer circumferential surface of the boss 22 through the inner circumferential surface 5, as in the second embodiment shown in FIG. It is also possible to fit into the inner peripheral surface of the disk 20.

FIG. 11 shows a fourth embodiment of the present invention, which is press-fitted onto the outer periphery of the boss 22 like the first embodiment, and which is provided on the outer periphery of the magnetic spur gear 2. The reinforcing metal ring 8 is caulked inward along one end surface in the axial direction, further improving its protective effect.

This reinforcing metal ring 8 is also made of a non-magnetic material as in the first embodiment, and the passage of magnetic flux between the magnetic sensor 29 and the magnetic spur gear 2 is not substantially inhibited.

FIG. 12 shows a fifth embodiment of the present invention, in which a magnetic crown gear 3 is used instead of the magnetic spur gear 2, and the ring 1
The operation and effect are similar to the fourth embodiment shown in FIG. 11, except that pulse detection is performed from the axial direction. In the case of this embodiment, the inner circumferential surface 5 is similar to the second embodiment.
It is also possible to fit into the outer peripheral surface of the boss 22 through the outer peripheral surface 6, or into the inner peripheral surface of the wheel disc 20 through the outer peripheral surface 6.

FIG. 13 shows a sixth embodiment of the present invention, which is similar to that shown in FIG. 11 except that a resin magnet ring 4 similar to that of the third embodiment is used instead of the magnetic crown gear 30. The operation and effect of the fourth embodiment and the fifth embodiment shown in FIG. 12 are the same.

FIG. 14 shows a seventh embodiment of the present invention. This embodiment is of a type that is press-fitted onto the outer periphery of the boss 22, and is approximately the same as the fourth embodiment, but has a magnetic A reinforcing metal ring 9 attached to the body spur gear 2 is formed integrally with the ring 1 so as to cover the outer periphery and both end faces in the axial direction of the ring 1, and is caulked to one end face in the axial direction. The protective effect in the axial direction is further improved than that of the conventional one.

FIG. 15 shows an eighth embodiment of the present invention, in which a magnetic crown gear 3 is used instead of the magnetic spur gear 2, and the ring 1
The operation and effect are similar to the seventh embodiment shown in FIG. 14, except that magnetic signals are detected in the axial direction.

In the case of this embodiment, the inner circumferential surface 5 may be fitted to the outer circumferential surface of the post 22, or the outer circumferential surface 6 may be fitted to the inner circumferential surface of the wheel disc 20, as in the fifth embodiment. is also possible.

FIG. 16 shows a ninth embodiment of the present invention, which is similar to that shown in FIG. 14 except that the same resin ring as in the third embodiment is used in place of the magnetic crown gear 3. The operation and effect are the same as that of the seventh embodiment shown in FIG. 15 and the eighth embodiment shown in FIG.

FIG. 17 shows a tenth embodiment of the present invention, in which the reinforcing metal ring 10 is press-fitted onto the outer periphery of a boss 22, and a reinforcing metal ring 10 is attached to a magnetic spur gear 22. It is attached to the inner circumferential surface instead of the outer circumferential surface. In the case of this embodiment, since the reinforcing metal ring 10 that comes into contact with the inner circumferential surface of the wheel disk 20 is made of metal, the press-fitting allowance can be made small, thereby reducing the influence on the magnetic spur gear 2 in the ring radial direction. It becomes possible to suppress it to the minimum.

FIG. 18 shows an eleventh embodiment of the present invention, which is similar to FIG. 17 except that a magnetic crown gear 3 is used instead of the magnetic spur gear 2 and magnetic signals are detected from the axial direction of the ring 1. The operation and effect are also similar to the tenth embodiment shown. In the case of this embodiment, the inner peripheral surface 5 allows the boss 22 to
It is also possible to fit it into the outer peripheral surface of the wheel disk 20, or to inject it into the inner peripheral surface of the wheel disc 20 through the outer peripheral surface 6.

When the reinforcing metal ring 10 that comes into contact with the inner circumferential surface of the wheel disk 2Q is made of metal, when the inner circumferential surface 5 is fitted, the press-fitting allowance can be reduced, and the magnetic spur gear 2
It is possible to minimize the influence on the ring diameter direction.

FIG. 19 shows a twelfth embodiment of the present invention, which is different from that shown in FIG. 17 except that a resin magnet ring 4 similar to the third embodiment is used instead of the magnetic crown gear 3. The operations and effects are the same as those of the tenth embodiment shown in FIG. 18 and the eleventh embodiment shown in FIG.

FIG. 20 shows a thirteenth embodiment of the present invention, and this embodiment is of a type that is press-fitted onto the outer periphery of the post 22, and is approximately the same as the tenth embodiment. In the example, the reinforcing metal ring 11 is caulked toward one end surface in the axial direction.

FIG. 21 shows a fourteenth embodiment of the present invention, which is similar to FIG. 20 except that a magnetic crown gear 3 is used instead of the magnetic spur gear 2 and magnetic signals are detected from the axial direction of the ring 1. The operation and effect are similar to the thirteenth embodiment shown. In the case of this embodiment, the inner circumferential surface 5 may be fitted to the outer circumferential surface of the post 22, as in the eleventh embodiment, or the outer circumferential surface 6 may be fitted to the inner circumferential surface of the wheel disc 20. is also possible.

FIG. 22 shows a fifteenth embodiment of the present invention, in which the magnetic crown gear 30 is replaced by the same resin vii as in the third embodiment.
The thirteenth embodiment shown in FIG. 20 and the fourteenth embodiment shown in FIG.
The embodiments and effects are also the same.

FIG. 23 shows a 16th embodiment of the present invention, in which the ring 1 is press-fitted onto the outer periphery of the boss 22, and is substantially the same as the 13th embodiment. However, a reinforcing metal ring 12 attached to the magnetic spur gear 2 is formed integrally with the ring 1 so as to cover the outer periphery and both end faces of the ring 1 in the axial direction.

FIG. 24 shows a seventeenth embodiment of the present invention, which is similar to FIG. 23 except that a magnetic crown gear 3 is used instead of the magnetic spur gear 2 and magnetic signals are detected from the axial direction of the ring 1. The operation and effect are the same as that of the 16th embodiment shown. In the case of this embodiment, the inner circumferential surface 5 may be fitted into the outer circumferential surface of the boss 22 as in the fourteenth embodiment, or the outer circumferential surface 6 may be fitted into the inner circumferential surface of the wheel disc 20. is also possible.

FIG. 25 shows an eighteenth embodiment of the present invention, which is different from that shown in FIG. 23 except that a resin magnet ring 4 similar to that of the third embodiment is used instead of the magnetic crown gear 3. The operation and effect of the 16th embodiment shown in FIG. 24 and the 17th embodiment shown in FIG. 24 are the same.

FIG. 26 shows a nineteenth embodiment of the present invention. According to this embodiment, the reinforcing metal ring 13 is attached to the magnetic spur gear 2.
Since the reinforcing metal ring 13, which is wrapped from the inner circumferential surface to one end surface in the axial direction and the outer circumferential surface of the wheel disk 20 and comes into contact with the inner circumferential surface of the wheel disk 20, is made of metal, the press-fitting allowance can be made small. This makes it possible to minimize the influence on the magnetic spur gear 2 in the ring radial direction.

Furthermore, protection of the axial end face and inner circumferential face becomes even more reliable. In the case of this embodiment, it is also possible to set @2a toward the inner surface of the magnetic spur gear 2, to fit it into the inner peripheral surface of the wheel disk 20 through the outer peripheral surface 6, or to insert the tooth 2a into the inner peripheral surface of the wheel disk 20 with the magnetic spur gear 2. It is also possible to fit the outer circumferential surface of the boss 22 by means of the inner circumferential surface 5 provided in the outward direction.

FIG. 27 shows a twentieth embodiment of the present invention, in which a magnetic crown gear ring 2 is used instead of the magnetic spur gear 2, and the second embodiment is
The operation and effect are similar to the nineteenth embodiment shown in FIG. In addition, this implementation.

In this example, the inner circumferential surface 5 may be fitted to the outer circumferential surface of the boss 22, as in the seventeenth embodiment, or the outer circumferential surface 6 may be fitted to the outer circumferential surface of the boss 22.
It is also possible to fit into the inner circumferential surface of the wheel disc 20 by using the above method.

FIG. 28 shows a twenty-first embodiment of the present invention, which is different from that shown in FIG. 26 except that a resin magnet ring 4 similar to the third embodiment is used instead of the magnetic crown gear 3. The operations and effects are the same as those of the nineteenth embodiment shown in FIG. 26 and the twentieth embodiment shown in FIG.

FIG. 29 shows a twenty-second embodiment of the invention, in which the ring 1 is of a type that is to be fitted into the inner peripheral surface of the wheel disc 20. In the case of this embodiment, the teeth 2a of the magnetic spur gear 2 in the ring 1 are provided toward the inner surface. Then, the outer circumferential surface 6 of the reinforcing metal ring 14 surrounding the magnetic spur gear 2 is injected into the inner circumferential surface of the wheel disk 20.

FIG. 30 shows a twenty-third embodiment of the present invention, and the second embodiment
It is almost the same as the 22nd embodiment shown in FIG. 9, but
Since the reinforcing metal ring 15 is caulked to one end surface of the rotating body in the axial direction, protection in the axial direction becomes even more reliable.

FIG. 31 shows a twenty-fourth embodiment of the present invention;
It is almost the same as the 23rd embodiment shown in FIG.
In the case of this embodiment, the reinforcing metal ring 16 is integrally formed with the ring 1 so as to cover the outer periphery and both end faces in the axial direction of the ring 1, so that the protection in the axial direction is better than in the 23rd embodiment. becomes even more certain.

FIG. 32 shows a twenty-fifth embodiment of the present invention, in which the ring 1 is of a type that is to be fitted onto the outer peripheral surface of the boss 22. A reinforcing metal ring 17 having an inner diameter smaller than that of the magnetic spur gear 2 is attached to the end surface of the magnetic spur gear 2 in the ring 1 in the axial direction. In the case of this embodiment, since the reinforcing metal ring 17 that comes into contact with the inner circumferential surface of the wheel disk 20 is made of metal when press-fitting into the boss 22, the press-fitting allowance can be made small, and the magnetic spur gear 2 It is possible to minimize the influence on the ring radial direction.

FIG. 33 shows a twenty-sixth embodiment of the present invention, which is shown in FIG. 32 except that a magnetic crown gear 3 is used instead of the magnetic spur gear 2Q and magnetic signals are detected from the axial direction of the ring 1. The operation and effect are the same as that of the twenty-fifth embodiment.

FIG. 34 shows a twenty-seventh embodiment of the present invention, in which a resin magnet 1 similar to the third embodiment is used instead of the magnetic spur gear 2.
The operation and effect are the same as the twenty-fifth embodiment shown in FIG. 32 and the twenty-sixth embodiment shown in FIG. 33, except that the tongue 4 is used.

Incidentally, in the above embodiments, a magnetic gear ring, a resin magnet ring, etc. have been described, but the present invention is not limited to the above, and it goes without saying that any ring for generating a magnetic signal may be used.

Further, although the above embodiments relate to wheel speed detection, the present invention is not limited to the above, but can be widely applied to detect rotational speeds of vehicles and industrial machines.

<Effects of the Invention> According to the magnetic signal generation ring of the present invention, since the magnetic ring is protected by a metal ring with excellent strength, it not only has improved durability but also does not break during press-fitting. Extremely easy to handle and durable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a non-driven support structure equipped with a magnetic signal generating ring according to the present invention. FIGS. 2 to 4 are principle diagrams showing how to obtain velocity pulses using a magnetic signal generating ring. FIG. 5 is a perspective view showing a first embodiment of the magnetic signal generating ring according to the present invention. FIG. 6 is a sectional view of the embodiment shown in FIG. FIG. 7 is a perspective view showing a second embodiment of the magnetic signal generating ring according to the present invention. FIG. 8 is a sectional view of the embodiment shown in FIG. 7. FIG. 9 is a perspective view showing a third embodiment of the magnetic signal generating ring according to the present invention. FIG. 10 is a sectional view of the embodiment shown in FIG. 9. 11 to 34 are cross-sectional views showing various embodiments of the present invention. 1... Magnetic signal generation ring 2... Magnetic spur gear 2a... Teeth... Magnetic crown gear ring 3a... Teeth 4... Resin magnet ring 5.
...Inner circumferential surface 6...Outer circumferential surface 7-17...Reinforcing metal ring 20...Wheel disc

Claims (5)

[Claims] (1) A magnetic signal generation ring that is attached to a rotating body to generate a magnetic signal by cooperating with a means for detecting changes in magnetic flux, and is a magnetic ring made of a synthetic resin material with magnetic material dispersed therein. A ring for generating a magnetic signal, comprising: and a metal ring reinforcing the magnetic ring. (2) The magnetic ring according to claim 1, wherein the magnetic ring is made of a synthetic resin with a magnetic material dispersed therein and has a plurality of teeth along its circumferential direction. Ring for signal generation. (3) The magnetic ring is formed by dispersing a magnetic material in a synthetic resin and is magnetized with alternating poles along its circumferential direction. Ring for magnetic signal generation. (4) The metal ring is attached to a circumferential surface different from a surface on which the magnetic signal generating ring is attached to the rotating body. A ring for generating magnetic signals as described in . (5) The magnetic device according to any one of claims 1 to 3, wherein the metal ring is attached to a mounting surface of the magnetic signal generating ring to the rotating body. Ring for signal generation.