JP2002168875A - Rotation detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detector having a superior vibration resistant performance even when an inexpensive magnetic reaction element is used for a magnetic detecting part. SOLUTION: A housing 1 has a cylindrical insertion part 1a to which an axle 13 is inserted. A rotary body 5 is provided with a cylindrical part 5a to which the insertion part 1a is inserted and which has a plurality of magnetic poles. The rotary body 5 rotates synchronously with a front wheel (wheel) 11 mounted to the axle 13. The magnetic detecting part (rotation-detecting part) 3 detects a change of the magnetic poles in consequence of the rotation of the cylindrical part 5a. A spacer (magnetic member) 4 is set to the periphery of the insertion part 1a of a bottom part 1g of the housing 1, which stops the rotary body 5 to the bottom part 1g when the cylindrical part 5a is set to the insertion part 1a. Projecting parts 5d which can butt against an inner wheel 12a are formed to points of the rotary body 5 opposite to the inner wheel 12a of a bearing 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating device mounted on a front wheel hub of a two-wheeled vehicle such as a motorcycle or a bicycle for transmitting the number of rotations of the two-wheeled vehicle to an indicating instrument such as a speedometer. The present invention relates to a detection device.

[0002]

2. Description of the Related Art A conventional rotation detecting device is disclosed in
There is one disclosed in Japanese Patent No. 4817. When such a rotation detection device is used as a rotation detection device for a motorcycle (for example, a motorcycle), it is mounted on a circuit board in a substantially cylindrical resin case having a detection surface for detecting an object to be detected. A magnetic detection element (Hall IC) and a magnet are disposed along the detection surface, and the circuit board;
A transmission gear in which the magnetic detection element and the magnet are sealed with a sealing member made of epoxy or the like, and the rotation detection device is attached to a transmission case or a sprocket cover, and a transmission gear that rotates inside the detection gear as an object to be detected. In general, it detects the tip of a sprocket or a sprocket.

[0003] In the case of detecting a tooth tip of a transmission gear or a sprocket as an object to be detected by using such a rotation detecting device, there is some clearance in the object to be detected. Vibration occurs in the object to be detected due to the body rigidity, displacement, etc., and the detection position gap between the object to be detected and the rotation detecting device fluctuates. There has been a problem that noise is caused, which may cause a malfunction of an indicating instrument for displaying speed, for example, in accordance with output data output from the rotation detecting device.

[0004] The applicant of the present invention focused on the above problem and disclosed in Japanese Patent Application Laid-Open No. 9-229714.
An electric rotation detecting device to be mounted on a hub of a front wheel of a motorcycle has been proposed. The rotation detecting device includes an insertion portion through which an axle (a front axle) of a two-wheeled vehicle is inserted into a resin housing.
A rotating body having a plurality of magnetic poles that rotates in synchronization with wheels mounted on the axle is mounted on the insertion portion, and the rotation of the rotating body is detected by a magnetic detection unit including a Hall IC or the like housed in the housing. The detection is not affected by the detection noise due to the vibration of the object to be detected, and accurate rotation detection can be obtained.

[0005]

However, in recent years, where the cost of the rotation detecting device applied to the two-wheeled vehicle is required to be reduced, the magnetic detecting portion is changed from a magnetic detecting element such as a Hall IC to an inexpensive reed switch or the like. There is a tendency to change to magnetic responsive elements. However, the magnetic detection means using the magnetic reaction element has a problem that the vibration resistance is inferior to the magnetic detection unit using a Hall IC or the like due to its characteristics and structure.

[0006] Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a rotation detecting device which is excellent in anti-vibration performance even when an inexpensive magnetic reaction element is used for the magnetic detecting section.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cylinder having one end abutting on an inner wheel of a bearing disposed on a hub of a wheel and an axle passing through the bearing being inserted. A housing including a cylindrical insertion portion, a rotating body including a cylindrical portion through which the insertion portion is inserted, and a rotation body including a rotation transmitting portion for rotating the cylindrical portion in synchronization with the rotation of the wheel; A rotation detecting unit provided to detect rotation of the rotating body, and a convex portion provided at a position of the bearing of the rotating body facing the inner wheel and capable of abutting on the inner wheel. It is.

[0008] The convex portion is provided at a position facing the inner wheel, and is partially provided on a peripheral edge of a hole through which the insertion portion is inserted.

The rotating body is made of a magnetic material and has a plurality of magnetic poles provided on the cylindrical portion.

The rotation detecting section is a reed switch.

Further, the rotating body has a plurality of uneven portions provided on an outer surface of the cylindrical portion.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3, a rotation detection device A includes a housing 1, a circuit board 2, a magnetic detection unit (rotation detection unit) 3, a spacer 4, a rotating body 5, a seal member 6, a wiring cord 7, It is composed of

The housing 1 is made of a resin material such as polybutylene terephthalate or nylon. At a substantially center of the housing 1, a cylindrical insertion portion 1a made of a metal material into which an axle to be described later is inserted is insert-molded. A rotating body 5 to be described in detail later is provided outside the insertion portion 1a. A storage space 1b for rotatably disposing the outer periphery of the insertion portion 1a is formed. A wall 1 surrounding the rotating body 5 is provided around the periphery of a place where the rotating body 5 described in detail after being mounted on the insertion portion 1a in the storage space 1b is provided.
c is formed, and a lubricant 8 made of grease or the like is provided between the wall portion 1c and the rotating body 5 fitted into the insertion portion 1a.
Is applied. In addition, a rotation detection surface 1d that is close to the cylindrical portion of the rotating body 5 is provided at a predetermined position of the wall 1c.

A housing 1e is formed in the housing 1 for accommodating a circuit board 2 and a magnetic detecting section 3 as a rotation detecting section, which will be described in detail later, and having a guide groove (not shown) for guiding and supporting the circuit board 2. The circuit board 2 is housed along the guide groove of the housing section 1e, so that the magnetic detecting section 3
Are disposed opposite to the magnetic detection surface 1d. On the open end of the housing 1 (the lower side of the housing 1 in FIG. 2), a mounting portion 1f for press-fitting and holding a seal member 6 described later in detail.
Are formed.

The circuit board 2 is made of an insulating material such as paper phenol or glass epoxy, and has a wiring pattern (not shown) formed thereon. Code 7
Are electrically fixed by solder. After the circuit board 2 is disposed in the storage section 1e such that the magnetic detection section 3 corresponds to the position of the rotation detection surface 1d formed in the housing 1, a sealing member made of epoxy or the like is provided in the storage section 1e. 9
Is filled and fixedly arranged in the storage section 1e.

The magnetic detector 3 is composed of, for example, a reed switch and a magnetic responsive element for detecting a change in magnetic pole.

The spacer 4 is provided at the insertion portion 1a of the housing 1.
Is a magnetic member having a hole 4a through which a metal material such as SK, SUM and SS is inserted. The spacer 4 is an annular plate-like member.
Is insert-molded on the bottom surface 1g, and is disposed so as to surround the insertion portion 1a on the bottom surface 1g.

The rotating body 5 is fitted into the insertion portion 1a of the housing 1 and is rotatable with respect to the outer periphery of the insertion portion 1a.
a, abuts on a locking claw of a hub of a front wheel described later,
And a rotation transmitting portion 5b for transmitting the rotation of the front wheel to the cylindrical portion 5a. The cylindrical portion 5a and the rotation transmitting portion 5b are made of a magnetic material, for example, a plastic such as an anisotropic material or an isotropic material. It is formed integrally by a magnet. That is, the insertion portion 1a penetrates the hole 5c provided in the cylindrical portion 5a, and the rotating body 5 is provided rotatably with respect to the insertion portion 1a. The cylindrical portion 5a of the rotating body 5 is subjected to, for example, four-pole magnetization (800 to 600 gauss) so that a change in magnetic pole caused by rotation of the cylindrical portion 5a can be detected by the magnetic detection unit 3.

Further, a protruding portion 5d which can be brought into contact with the inner wheel is provided at a position of the bearing of the rotating body 5 which will be described later, facing the inner wheel.

The four protruding portions 5d are partially provided on the periphery of the hole 5c through which the insertion portion 1a is inserted at a location facing the inner wheel.

When the cylindrical portion 5a is inserted into the insertion portion 1a of the housing 1, the rotator 5 is arranged such that the position of the convex portion 5d is a small distance L from the end of the insertion portion 1a. It is arranged in the housing 1 so that

The sealing member 6 is made of an elastic member such as nitrile or silicon, and has a thin cylindrical shape.
The sealing member 6 has a groove 6 having a substantially V-shaped cross section.
a is formed over the entire circumference, and a holding member 6b made of a metal material having a substantially L-shaped cross section is insert-molded in a thick portion outside the groove 6a. The seal member 6 is formed so that the outer diameter thereof is slightly larger than the inner diameter of the peripheral wall of the mounting portion 1f of the housing 1, and is held by being pressed into the mounting portion 1f of the housing 1. The Rukoto.

The wiring code 7 transmits an output signal from the magnetic detection unit 3 to the outside via the circuit board 2.
At the end of the wiring cord 7, a connector portion 7a for connecting to another device is provided.

The above components constitute a rotation detecting device A. Next, the attachment of the rotation detecting device A to the motorcycle will be described with reference to FIG.

In FIG. 4, 10 is a hub of a front wheel (wheel) 11 of a motorcycle or the like, 10a is a locking claw for transmitting rotation to the front wheel 11 to a rotation transmitting portion 5b of the rotating body 5, and 12 is a hub. 10, is press-fitted into a recess 10b provided in the outer wheel 12b, and includes an inner wheel 12a and an outer wheel 12b.
Is a bearing that rotates with respect to the inner wheel 12a via the ball 12c. Depending on the configuration of each part,
The front wheel 11 is attached to the axle 13 by an inner wheel 12a of a bearing 12,
The outer wheel 12b is rotatably disposed with respect to the axle 13.

In the rotation detecting device A mounted on the front wheel 11 having the above structure, the axle 13 is inserted through the insertion portion 1a of the housing 1, and the rotation transmitting portion 5b provided on the rotating body 5 is formed on the hub 10. The housing 1 is inserted into the bearing 12
Hub 10 so that it contacts the inner wheel 12a of the
By being fitted into the front wheel, the rotator 5 is mounted between the front fork 14 and the front wheel 11, and the rotating body 5 can rotate as the front wheel 11 rotates.

In this rotation detecting device A, a spacer 4 which is a magnetic member is disposed on the bottom surface 1g of the housing 1, and a cylindrical portion 5a of the rotating body 5 which is magnetized is a spacer 4 made of a magnetic material. Is held in close contact with the bottom 1g. Therefore, even when the vibration received from the engine in the idling state or an external factor is transmitted to the rotating body 5 (transmitted via the rotation transmitting unit 5b), the magnetic detection unit 3 rotates even when the vehicle is stopped. Since the body 5 is held in close contact with the spacer 4, vibration of the rotating body 5 is suppressed, and erroneous detection in magnetic detection can be prevented.

This is important in preventing erroneous detection by the magnetic detection unit 5 because the form of vibration transmitted to the rotating body 5 is different between the inner wheel 12a and the outer wheel 12b of the bearing 12. .

This is, as shown in FIG.
Of the housing 1 (insertion portion 1a), the inner wheel 12a, and the cylindrical body 11 in the hub 10 of the front wheel 11 from the right side in the figure via the axle 13.
a, the intermediate cylinder 15 is fixed with the front fork 14 in a state of being clamped, and the housing 1 provided with the magnetic detection unit 3 and the inner wheel 12a have the same vibration even when vibrated. On the other hand, the outer wheel 12 b of the bearing 12 is connected to the hub 10 of the front wheel 11.
, And the front wheel 11 and the outer wheel 12b have the same vibration even when they vibrate. Since the inner wheel 12a and the outer wheel 12b pass through the ball 12c, vibration is not transmitted uniformly. Therefore, the vibration mode of the rotation detection device A attached to the axle 13 via the insertion portion 1a and the outer wheel 12b of the bearing 12 are different from the vibration mode transmitted from the tire mounted on the front wheel 11. Therefore, when the rotating body 5 is brought into contact with the outer wheel 12b having a vibration mode different from that of the magnetic detection section 3 as the rotation detection section, the vibration mode may be different and erroneous detection may occur. Therefore, when the rotating body 5 is brought into contact with the inner wheel 12b, which has the same vibration mode as the magnetic detection section 3 as the rotation detection section, the vibration mode becomes the same, and erroneous detection can be prevented.

Also, even if the rotating body 5 is no longer in close contact with the bottom surface 1g of the housing 1 due to excessive vibration, even if the rotating body 5 moves in the direction of the bearing 12, the convex portion 5d formed on the rotating body 5 Accordingly, the rotating body 5 can be kept in contact with the inner wheel 12a of the bearing 12 and not in contact with the outer wheel 12b. This means that the inner wheel 1 of the bearing 12
Since the vibration form transmitted to the rotating body 5 is different between the 2a and the outer wheel 12b, this is important in preventing erroneous detection by the magnetic detection unit 5.

The erroneous detection in the magnetic detection is performed by the magnetic detection unit 3
Is formed by a reed switch, and the magnetized area provided on the cylindrical portion 5a is remarkably exhibited when it is located at the switching point on the magnetic detection surface 1d of the housing 1. By interposing the spacer 4, the vibration of the rotating body 5 can be suppressed, and by providing the rotation transmitting portion 5b with the convex portion 5d,
Even when the rotating body 5 is separated from the bottom 1g due to excessive vibration, the rotating body 5 (rotation transmitting part 5b) does not come into contact with the outer wheel 12b. Even when the detection unit is used, it is possible to configure the rotation detection device A that enables good rotation detection.

In the embodiment of the present invention, the spacer 4 is disposed on the bottom surface 1g of the housing 1 by insert molding.
The spacer 4 may be provided and fixed to the g with an adhesive or the like.

Next, another embodiment of the present invention will be described with reference to FIG. 5, but the same or corresponding portions as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The rotation detecting device A shown in FIG. 5 is different from the above-described embodiment in that the rotating body 5 is brought into close contact with the bottom surface 1g of the housing 1 without disposing the spacer 4 made of a magnetic member. The point is to keep.

That is, in the rotation detecting device A, the insertion portion 1a provided in the housing 1 is made of, for example, the same material (a metal material such as SK, SUM and SS) as the spacer 4 of the embodiment.
And a contact portion (magnetic member) 1h that comes into contact with the cylindrical portion 5a of the rotating body 5 at the bottom 1g of the housing 1 in the insertion portion 1a. 5 to the housing 1
Is held in close contact with the bottom surface 1g side of.

The rotation detecting device A is provided integrally with the insertion portion 1a, and has the same effect as the case where the spacer 4 is provided by the contact portion 1h exposed from the bottom surface 1g of the housing 1. Becomes In addition, the insertion portion 1a
By forming the contact portion 1h, which is a magnetic member, integrally, the number of components can be reduced, and the manufacturing cost of the rotation detecting device A can be reduced.

In the above embodiment, the rotating member 5
Is pulled toward the bottom 1 side of the housing 1 and rarely comes into contact with the inner wheel 12a. The present invention may be applied to any object. Also in this case, the rotating body 5
Is connected to the inner wheel 12a by the protruding portion 5d and can suppress the vibration of the rotating body 5, thereby enabling good rotation detection even when using an inexpensive magnetic detection unit using the reed switch. The rotation detection device A can be configured.

In the embodiment of the present invention, the cylindrical portion 5a
And the rotation transmitting portion 5b are described using the rotating body 5 integrally provided by using a plus tip magnet. However, the rotating body in the present invention includes a cylindrical portion 5a having a plurality of magnetic poles, and a wheel attached to the cylindrical portion 5a. The rotation transmitting portion 5b for transmitting the rotation may be provided separately.

In each of the embodiments of the present invention, as the rotating body 5, a cylindrical portion 5a having a plurality of magnetic poles and a rotation transmitting portion 5b for transmitting the rotation of the front wheel 10 to the cylindrical portion 5a are integrated by a plastic magnet. However, in the present invention, an uneven portion is provided on the outer periphery (outer surface) of the cylindrical portion of the rotating body attached to the insertion portion (gear structure), and the rotating portion is rotated by the uneven portion. Japanese Patent Application No. 11-5485 filed by the applicant of the present invention in which the rotation of the front wheel is transmitted through a transmission unit, and the rotating uneven portion is detected by a magnetic detection unit mainly composed of a magnet and a Hall IC.
It is also effective in the structure of the rotation detection device based on No. 0.

[0040]

According to the present invention, there is provided a rotation detecting device which can achieve the initial purpose and has excellent vibration resistance even when an inexpensive magnetic responsive element such as a reed switch is used as a magnetic detecting portion. Can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a rotation detection device according to an embodiment of the present invention.

FIG. 2 is an essential part cross-sectional view of the rotation detection device of the embodiment.

FIG. 3 is a plan view of the housing of the embodiment.

FIG. 4 is a diagram showing an attached state of the rotation detecting device of the embodiment.

FIG. 5 is a sectional view of a main part showing a rotation detecting device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Penetration part 3 Magnetic detection part (rotation detection part) 5 Rotating body 5a Cylindrical part 5b Rotation transmission part 5d Convex part 10 Hub 11 Front wheel (wheel) 12 Bearing 12a Inner wheel 12b Outer wheel 13 Axle A rotation detection device

Claims (5)

[Claims] 1. A housing having one end in contact with an inner wheel of a bearing disposed on a hub of a wheel, and having a cylindrical insertion portion through which an axle penetrating the bearing is inserted, and the insertion portion being inserted. A rotating body including a cylindrical portion, and a rotation transmitting unit for rotating the cylindrical portion in synchronization with the rotation of the wheel; a rotation detecting unit provided in the housing and detecting rotation of the rotating body; And a convex portion provided at a position of the bearing of the rotating body facing the inner wheel, the convex portion being capable of abutting on the inner wheel. 2. The rotation according to claim 1, wherein the convex portion is provided at a position facing the inner wheel and partially at a periphery of a hole through which the insertion portion is inserted. Detection device. 3. The rotation detecting device according to claim 1, wherein the rotating body is made of a magnetic material and a plurality of magnetic poles are provided on the cylindrical portion. 4. The rotation detection device according to claim 1, wherein the rotation detection unit is a reed switch. 5. The rotation detecting device according to claim 1, wherein the rotating body has a plurality of uneven portions provided on an outer surface of the cylindrical portion.