JPS6326534A - Magnetic signal generating ring - Google Patents

Abstract

PURPOSE:To obtain a ring for magnetic signal generation which has good assembly operability and is easy to handle by providing a main body part which is divided into at least two arcuate parts and a clamping means which clamps the main body part in one body. CONSTITUTION:Two parts 1a of a ring 1 which are almost in the same shape are coupled integrally by a metallic ring 14 formed on nonmagnetic metal to to form a magnetic body spur gear 2. When the ring 1 is assembled, the parts 1a are supported in a ring shape so that the inner peripheral surfaces 4 of the two parts 1a contact a boss 22; and the ring 14 fitted on the boss 22 loosely in advance is pressed onto the two parts 1a. Then, the ring 1 is equipped with the gear 2 which has plural teeth 2a formed on the outer peripheral surface at equal intervals, and a 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 number of teeth 2a of the gear 2 passing nearby the core 30 according to the rotation of the ring 1 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, gears or magnet rings with magnetized outer circumferential surfaces having alternating poles at equal intervals have been used as part of a wheel to measure the rotational speed of the wheel for skid control or other purposes of a vehicle. is attached, and a well-known °
The magnetic sensor detects the rotational speed of the wheel by obtaining a magnetic signal as the teeth of the gear or the poles of the magnet ring pass. The gear and magnet ring of such a magnetic signal generating ring are fixed by being coaxially press-fitted onto the rotating shaft of the wheel, etc., so other parts are assembled after the rings are press-fitted. Therefore, it is necessary to handle the rotating body of the wheel, etc. with the magnetic signal generating ring, which is relatively weak, attached, which tends to limit the assembly procedure and make management complicated.

Furthermore, if it becomes necessary to replace the magnetic signal generating ring due to tooth damage caused by disturbance after the magnetic signal generating ring is attached to the rotating shaft, there is a drawback that the replacement work becomes complicated.

<Problems to be Solved by the Invention> In view of the drawbacks of the prior art, the main object of the present invention is to provide a magnetic signal generating ring that is easy to assemble and handle after assembly. I'm in the middle of the day.

<Means for Solving the Problems> According to the present invention, such an object is a ring mounted on a rotating body to generate a magnetic signal by cooperating with a magnetic sensor, which comprises at least two This is achieved by providing a magnetic signal generating ring characterized by having a main body portion divided into partially arcuate portions and a fastening means for integrally joining the main body portion. In particular, it is preferable that the fastening means is made of a metal ring.

<Function> By using a ring divided in this way, it becomes possible to attach or replace the magnetic signal generation ring after assembling other parts to the rotating body, which reduces the assembly work and post-assembly process. Improved handling.

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-driven wheel support groove equipped with a magnetic signal generating ring 1 according to the 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 boss is rotatably supported by an axle spindle 26 via tapered bearings 24,25. This wheel disc 20 is temporarily fixed to an 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 fitted around the outer periphery of the boss 22 of the wheel disk 20, and a magnetic sensor 29 is fixedly installed on a portion of the vehicle body adjacent to the outer periphery.

FIG. 2 shows the operating principle of the magnetic signal generating ring based on the present invention. The ring 1 has a magnetic spur gear 2 in which a plurality of teeth 2a are formed at equal intervals on the outer circumferential surface. The magnetic sensor 29 has a magnetized core material 30 and a coil 31 wound around the core material, and as the ring 1 rotates, the core 30
The purpose is to detect the rotational speed of the ring 1, that is, the wheel disk 20, by causing the coil 31 to generate a magnetic signal corresponding to the number of teeth 2a of the magnetic spur gear 2 passing near the ring 1.

In place of the magnetic spur gear 2 described above, a magnetic crown gear in which teeth are formed not on the outer peripheral surface of the ring 1 but on the end surface in the axial direction as shown in FIG. Alternatively, as shown in FIG. 4, a known resin magnet may be used instead of the magnetic spur gear 2, and the outer peripheral surface is magnetized with alternating poles arranged at equal intervals. The rotational speed of the wheel disk 20 may be detected using a resin magnet ring and a sensor 39 that generates a magnetic signal in the coil 41 in response to changes in magnetic poles passing near both ends of the U-shaped core material 40.

5 and 6 show a first embodiment of the magnetic signal generating ring according to the present invention. In the ring 1, two portions 1a having substantially the same shape are formed of non-magnetic metal. A magnetic spur gear 2 in the form of an externally toothed spur gear is integrally connected by a metal fastening ring 14 . Also, part 1a
is formed by kneading synthetic resin such as thermoplastic polyamide or polyolefin with high magnetic permeability material such as soft ferrite or iron.

The number of @2a of this magnetic spur gear 2 is preferably 10 or more, preferably 25 to 100.

The maximum magnetic permeability of the magnetic spur gear 2 thus formed is desirably 5 or more, preferably 10 or more.

The ring 1 is assembled so that the inner peripheral surface 4 of the two parts 1a is in close contact with the boss 22 of the wheel disc 20.
is supported in a ring shape, and the metal fastening ring 14, which has been loosely fitted in advance to the boss 22, is press-fitted into these two parts 1a, so that the ring 1 is integrally formed, and at the same time, the boss 2
Fixed to 2.

According to the present invention, since the ring 1 can be fitted after other members are assembled to the boss 22, the ring 1 is prevented from being damaged by the mounting magnet, and its handling properties are improved. Furthermore, even if it becomes necessary to replace the ring 1 due to damage to the teeth 2a after mounting, the work can be easily performed.

FIG. 7 shows a second embodiment of the magnetic signal generating ring according to the present invention, in which the magnetic spur gear 2 is replaced by a known resin magnet, and the outer peripheral surfaces are arranged alternately at equal intervals. The operation and effect are the same as in the first embodiment shown in FIGS. 7 and 6, except that the resin magnet ring 6 which is polarized is used.

FIG. 8 shows a third embodiment of the magnetic signal generating ring according to the present invention, in which teeth are formed on the axial end surface of the annular boss 22 instead of the magnetic spur gear 2 consisting of an externally toothed spur gear. The magnetic crown gear 7 is used, and the operation and effect are as shown in FIGS. 5 and 6, except that the magnetic signal is detected from the axial direction.
This is similar to the first embodiment shown in the figure. According to this embodiment, as shown by the solid line in FIG. It is also possible to fit the ring 1 into the inner peripheral surface of the wheel disc 20 as shown in phantom lines in the figure.

When fitting into the inner circumferential surface of the wheel disk 20, the ring 1 is formed and fixed by simply aligning the portions 1a and press-fitting into the inner circumferential surface of the wheel disk 20 without using the metal fastening ring 14.

FIG. 9 shows a fourth embodiment of the magnetic signal generating ring according to the present invention, in which the ring 1 consists of two parts 1a.
The magnetic spur gear 2, which is an annular externally toothed spur gear, is attached to a reinforcing resin ring 3 such that its outer diameter consists of a small diameter portion 12 and a large diameter portion 13, and the teeth 2a face the large diameter portion]3. is buried inside.

In order to attach this ring 1 to the boss 22, the portion 1a is
The fastening ring 14, which is tightly supported on the outer circumferential surface of the boss 22 to form a ring, is press-fitted into the fastening ring 14, which is loosely fitted to the boss 22, on the side surface of the small diameter part 12, or the small diameter part is fastened. A fastening belt 15 shown in FIG. 18 is wound around the side surface of 12, and the portions 1a are connected by tightening with screws 15a.

According to this embodiment, since the fastening part and the signal generating part are provided separately, the signal generating part can be more reliably protected during installation. Further, after installation, signal generation is not obstructed by the fastening member.

FIG. 10 shows the fifth ring of the magnetic signal generation ring according to the present invention.
This embodiment is similar in function and effect to the fourth embodiment shown in FIG. 9, except that a resin magnet ring 6 is used instead of the magnetic spur gear 2.

FIG. 11 shows the sixth ring of the magnetic signal generation ring based on the present invention.
The operation and effect are also shown in FIG. 9, except that a magnetic crown gear 7 is used in place of the magnetic spur gear 2, and magnetic signals are detected from the axial direction of the boss 22. This is the same as the fourth embodiment.

FIG. 12 shows the seventh ring of the magnetic signal generation ring according to the present invention.
This embodiment is of a type that fits into the inner circumferential surface of the boss 22, and instead of the magnetic spur gear 2 consisting of an external spur gear, a magnetic spur gear consisting of an internal spur gear is used. A spur gear 8 is used, and magnetic signals are detected near its teeth 8a. According to this embodiment, a fastening ring or the like is not required to fit the ring 1, and the ring 1 is fixed by the inner circumferential surface of the boss 22 by aligning the portions 1a and press-fitting the inner circumferential surface of the boss 22. . Moreover, since no unnecessary force is applied to the teeth 2a during press-fitting, the teeth 2a are not damaged.

FIG. 13 shows the eighth part of the magnetic signal generating ring based on the present invention.
This shows an example of a magnetic spur gear 8 in the form of an internal spur gear.
The function and effect are the same as the first one, except that a resin F11 stone whose inner peripheral surface is magnetized with alternating poles at equal intervals is used instead.
This is similar to the seventh embodiment shown in FIG.

FIG. 14 shows the ninth part of the magnetic signal generating ring based on the present invention.
This embodiment is of a type that is fitted onto the outer circumferential surface of the boss 22, and the magnetic spur gear 2, which is an externally toothed spur gear, is fitted onto the intermediate portion of the outer circumferential surface of the boss 22 in advance. The operation and effect are similar to the first embodiment shown in FIGS. 5 and 6, except that the outer flange 16 is directly screwed into the provided outward flange 16 by bolts 18.

FIG. 15 shows the first ring of the magnetic signal generation ring according to the present invention.
0, and instead of the magnetic spur gear 2 made of an externally toothed spur gear, a resin magnet ring 6 made of a resin magnet and whose outer circumferential surface is magnetized with alternating poles at equal intervals is used. Other than this, the operation and effect are similar to the ninth embodiment shown in FIG. 14.

FIG. 16 shows the first ring of the magnetic signal generation ring according to the present invention.
This embodiment is of a type that is fitted into the inner peripheral surface of the post 22, and the magnetic spur gear 8 consisting of an internal spur gear is inserted into the inner peripheral surface of the wheel disk 20 in advance. The operation and effect are similar to the seventh embodiment shown in FIG. 12, except that the inward flange 17 provided at the intermediate portion is directly screwed by bolts 18.

FIG. 17 shows the first ring of the magnetic signal generation ring according to the present invention.
The eleventh embodiment is shown in FIG. 18 with its functions and effects, except that a resin magnet ring 9 is used instead of the magnetic spur gear 8 made of an internal spur gear. It's the same as.

Although the above-described embodiments relate to wheel speed detection, the present invention is not limited thereto and can be widely applied to detecting rotational speeds of vehicles and industrial machines.

<Effects of the Invention> As described above, according to the present invention, the magnetic signal generation ring, which needs to be handled relatively carefully, can be attached to other parts by simple construction by just dividing the magnetic signal generation ring. Since it can be attached to a rotating member later, parts management becomes easy and assembly work efficiency is significantly improved. Furthermore, since replacement etc. are easy, handling after assembly is also improved, and the effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a non-driving wheel support structure of a four-wheeled vehicle equipped with a magnetic signal generating ring according to the present invention. 2 to 4 are principle diagrams showing how to obtain velocity pulses using the magnetic signal generating ring according to the present invention. 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 side sectional view showing a first embodiment of the magnetic signal generating ring according to the present invention. 7 to 17 are side sectional views showing various embodiments of the magnetic signal generating ring according to the present invention. FIG. 18 is a perspective view showing a fastening belt in the fourth embodiment.

Claims (2)

[Claims] (1) A magnetic signal generation ring attached to a rotating body to generate a magnetic signal by cooperating with a magnetic sensor, the ring comprising: a main body portion divided into at least two partial arc-shaped portions; and the main body portion. 1. A ring for generating a magnetic signal, comprising a fastening means for integrally joining the parts. (2) The magnetic signal generating ring according to claim 1, wherein the fastening means is made of a metal ring.