JP3365627B2 - Rotation detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation for transmitting a rotational speed of a wheel of a motorcycle mounted on a hub of a front wheel of a motorcycle such as a motorcycle or a bicycle 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 Japanese Patent Laid-Open No. 2-26.
There is one disclosed in Japanese Patent No. 4817. Such a rotation detecting device, when used as a rotation detecting device for a two-wheeled vehicle (for example, a motorcycle), 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 arranged along the detection surface, and the circuit board,
The magnetic detection element and the magnet are sealed by a sealing member made of epoxy or the like, and the rotation detection device is attached to a mission case or a sprocket cover, and a transmission gear that rotates inside thereof is detected as an object to be detected. It is common to detect the tooth tip of a sprocket or the like.

When such a rotation detecting device is used to detect a tooth tip of a transmission gear or a sprocket as an object to be detected, the object to be detected has some clearance, so that the vehicle (two-wheeled vehicle) Since the detected body vibrates due to the body rigidity and the exhaust amount of the body, and the detection position gap between the detected body and the rotation detecting device changes, a magnetic change occurs in the rotation detecting device and is detected. There is a problem in that it causes noise, which may cause a malfunction of the indicating instrument for displaying the speed, for example, according to the output data output from the rotation detecting device.

Therefore, the applicant of the present application pays attention to the above-mentioned problems and, as disclosed in Japanese Patent Laid-Open No. 9-229714,
We have proposed an electric rotation detection device to be mounted on the hub of the front wheel of a two-wheeled vehicle. This rotation detecting device is provided with a resin housing having an insertion portion through which an axle (front wheel axle) of a two-wheel vehicle is inserted.
A rotating body having a plurality of magnetic poles that rotate in synchronism with wheels mounted on the axle is attached to the insertion portion, and the rotation of the rotating body is detected by a magnetic detection unit such as a Hall IC housed in the housing. The detection is performed, and accurate rotation detection can be obtained without being affected by the detection noise due to the vibration of the object to be detected.

[0005]

However, in recent years when the cost of the rotation detecting device applied to a 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. It tends to be changed to a magnetically responsive element. However, the magnetic detecting means using the magnetic reaction element has a problem that its vibration resistance performance is inferior to the magnetic detecting portion using the Hall IC or the like due to its characteristics and structure.

In view of the above problems, the present invention has an object to provide a rotation detecting device which is excellent in vibration resistance even when an inexpensive magnetic reaction element is used in the magnetic detecting portion.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a cylinder in which one end abuts an inner wheel of a bearing arranged on a hub of a wheel and an axle passing through the bearing is inserted. A housing having a cylindrical insertion part, a cylindrical part through which the insertion part is inserted, and a rotating body having a rotation transmission part for rotating the cylindrical part in synchronization with rotation of the wheel; A rotation detecting portion provided for detecting rotation of the rotating body, and a convex portion provided at a position facing the inner wheel in the bearing of the rotating body and capable of contacting the inner wheel. Is.

Further, the convex portion is partially provided on the peripheral edge of the hole portion through which the insertion portion is inserted, at a position facing the inner wheel.

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 concave and convex portions provided on the outer surface of the cylindrical portion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3, a rotation detecting device A includes a housing 1, a circuit board 2, a magnetic detecting portion (rotation detecting portion) 3, a spacer 4, a rotating body 5, a sealing member 6, and a wiring cord 7. It consists of and.

The housing 1 is made of a resin material such as polybutylene terephthalate or nylon. A cylindrical insertion portion 1a made of a metal material into which an axle to be described later is inserted is insert-molded in the substantially center of the housing 1, and a rotating body 5 described in detail later is provided outside the insertion portion 1a. A storage space 1b for rotatably arranging with respect to the outer periphery of the insertion portion 1a is formed. Further, the wall portion 1 surrounding the rotating body 5 is provided at the peripheral edge of the storage space 1b where the rotating body 5 to be described in detail after being mounted on the insertion portion 1a.
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 in the insertion portion 1a.
Is applied. Further, a rotation detection surface 1d is provided at a predetermined position on the wall portion 1c in the vicinity of the cylindrical portion of the rotating body 5.

Further, the housing 1 is provided with a circuit board 2 and a magnetic detection section 3 which is a rotation detection section, which will be described in detail later, and a storage section 1e having a guide groove (not shown) for guiding and supporting the circuit board 2 is formed. The circuit board 2 is housed along the guide groove of the housing portion 1e, so that the magnetic detection portion 3
Are arranged to face the magnetic detection surface 1d. Further, a mounting portion 1f for press-fitting and holding a seal member 6 described later in detail is provided at the open end of the housing 1 (the lower side of the housing 1 in FIG. 2).
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. The land portion (not shown) formed at a predetermined portion of the wiring pattern, the magnetic detection portion 3, and the wiring. Code 7
And are electrically fixed by solder. The circuit board 2 is disposed in the storage portion 1e so that the magnetic detection portion 3 corresponds to the position of the rotation detection surface 1d formed in the housing 1, and then the sealing member made of epoxy or the like is placed in the storage portion 1e. 9
By being filled with, it is fixedly arranged in the storage unit 1e.

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

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

The rotating body 5 is fitted in the insertion portion 1a of the housing 1 and is rotatable with respect to the outer periphery of the insertion portion 1a.
a and the locking claw of the hub of the front wheel described later,
A rotation transmitting portion 5b for transmitting the rotation of the front wheel to the cylindrical portion 5a is provided, and the cylindrical portion 5a and the rotation transmitting portion 5b are made of a magnetic material, for example, a plastic of an anisotropic material or an isotropic material. It is integrally formed 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 rotatably provided with respect to the insertion portion 1a. The cylindrical portion 5a of the rotating body 5 is, for example, quadrupole magnetized (800 to 600 gauss) so that the change of the magnetic pole due to the rotation of the cylindrical portion 5a can be detected by the magnetic detection unit 3.

Further, a convex portion 5d capable of abutting on the inner wheel is provided at a portion of the bearing of the rotating body 5 which will be described later and which faces the inner wheel.

Four of these convex portions 5d are provided at the peripheral portion of the hole portion 5c through which the insertion portion 1a is inserted, at a position facing the inner wheel.

Further, in the rotating body 5, when the cylindrical portion 5a is fitted into the insertion portion 1a of the housing 1, the position where the convex portion 5d is arranged secures a minute distance L from the end of the insertion portion 1a. Is arranged in the housing 1 so that

The seal member 6 is made of an elastic material such as nitrile or silicon, and has a thin cylindrical shape.
The seal member 6 has a groove portion 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 such 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, so that the sealing member 6 is held by being press-fitted into the mounting portion 1f of the housing 1. The Rukoto.

The wiring cord 7 is for transmitting the output signal from the magnetic detection section 3 to the outside through the circuit board 2.
A connector portion 7a for connecting to another device is provided at the end of the wiring cord 7.

The rotation detecting device A is constituted by the above-mentioned respective parts. Next, the attachment of the rotation detection device A to the two-wheeled vehicle 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 the rotation to the front wheel 11 to the rotation transmitting portion 5b of the rotating body 5, and 12 is a hub. The inner wheel 12a and the outer wheel 12b are provided so as to be press-fitted into a recess 10b provided in the outer wheel 12b.
Is a bearing that rotates with respect to the inner wheel 12a via balls 12c. By the configuration of each of the above parts,
The front wheel 11 is attached to the axle 13 by the inner wheel 12a of the bearing 12, and
It is rotatably arranged with respect to the axle 13 by an outer wheel 12b.

In the rotation detecting device A attached to the front wheel 11 having the above structure, the axle 13 is inserted into the insertion portion 1a of the housing 1, and the rotation transmission portion 5b provided in the rotating body 5 is formed in the hub 10. The engaging portion 1a of the housing 1 is engaged with the locking claw 10a to make the bearing 12
Hub 10 so that it abuts the inner wheel 12a of
By mounting the front wheel 14 on the front fork 14 and the front wheel 11, the rotating body 5 can rotate as the front wheel 11 rotates.

In this rotation detecting device A, the spacer 4 which is a magnetic member is arranged on the bottom surface 1g of the housing 1, and the magnetized cylindrical portion 5a of the rotating body 5 is made of a magnetic material. Due to the existence of the above, it is held in close contact with the bottom portion 1g. Therefore, even when the vibration received from the engine in an idling state or an external factor is transmitted to the rotating body 5 (transmitted via the rotation transmitting portion 5b), particularly when the vehicle is stopped, the magnetic detection portion 3 rotates. Since the body 5 is held in close contact with the spacer 4, the 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 vibration form transmitted to the rotating body 5 is different between the inner wheel 12a and the outer wheel 12b of the bearing 12. .

This is the bearing 12 as shown in FIG.
The inner wheel 12a of the inner wheel 12a of the housing 1 (insertion portion 1a), the inner wheel 12a, and the tubular body 11 inside the hub 10 of the front wheel 11 from the right side in the drawing via the axle 13.
a, the intermediate tubular body 15 is fixed by the front fork 14 in a state of being sandwiched, and the housing 1 provided with the magnetic detection unit 3 and the inner wheel 12a have the same vibration even if they vibrate. On the other hand, the outer wheel 12 b of the bearing 12 is the hub 10 of the front wheel 11.
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 are provided with the balls 12c, the vibration is not uniformly transmitted. Therefore, the vibration mode of the rotation detection device A attached to the axle 13 via the insertion portion 1a and the vibration mode of the outer wheel 12b of the bearing 12 are different from the vibration mode transmitted from the tire mounted on the front wheel 11. 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 unit 3 which is a rotation detection unit, the vibration mode may be different, resulting in erroneous detection. Therefore, when the rotating body 5 is brought into contact with the inner wheel 12b having the same vibration form as the magnetic detection unit 3 which is the rotation detection unit, the vibration form becomes the same and erroneous detection can be prevented.

Even if the rotating body 5 loses its close contact with the bottom surface 1g of the housing 1 due to excessive vibration and the rotating body 5 moves toward the bearing 12, the convex portion 5d formed on the rotating body 5 will be described. Thereby, 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 caused by the magnetic detection unit 3
Is formed of a reed switch, and the magnetized region formed on the cylindrical portion 5a appears remarkably when it is located at the switching point on the magnetic detection surface 1d of the housing 1. By interposing the spacer 4, it is possible to suppress the vibration of the rotating body 5, and by providing the rotation transmitting portion 5b with the convex portion 5d,
Even if the rotating body 5 is separated from the bottom portion 1g due to excessive vibration, the rotating body 5 (rotation transmitting portion 5b) does not contact the outer wheel 12b. It is possible to configure the rotation detection device A that enables good rotation detection even when the detection unit is used.

In the embodiment of the present invention, the spacer 4 is disposed on the bottom surface 1g of the housing 1 by insert molding, but the present invention is based on the bottom surface 1g of the housing 1.
The spacer 4 may be disposed and fixed to 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 of the above-described embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

The rotation detecting device A shown in FIG. 5 differs from the above-described embodiment in that the rotor 5 is in close contact with the bottom surface 1g of the housing 1 without disposing the spacer 4 made of a magnetic member. There is a point to hold.

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 as the spacer 4 of the above-described embodiment (metal material such as SK, SUM and SS).
And the contact portion (magnetic member) 1h that comes into contact with the cylindrical portion 5a of the rotating body 5 at the bottom surface 1g of the housing 1 is provided in the insertion portion 1a. The cylindrical portion 5a of the housing 5
It is held in close contact with the bottom surface 1g side.

The rotation detecting device A is provided integrally with the insertion portion 1a, and the contact portion 1h exposed from the bottom surface 1g of the housing 1 can achieve the same effect as that when the spacer 4 is arranged. Becomes Also, the insertion portion 1a
By configuring the contact portion 1h, which is a magnetic member, integrally with, the number of parts can be reduced, and the manufacturing cost of the rotation detection device A can be reduced.

In the above embodiment, the rotating body 5
Was pulled to the bottom 1 side of the housing 1 and rarely contacted the inner wheel 12a, but the spacer 4 of the above-mentioned embodiment was used as a corrugated washer, and the rotating body 5 was pressed toward the bearing 12 direction. The present invention may be applied to any one. Also in this case, the rotating body 5
Is connected to the inner wheel 12a by the convex portion 5d, and vibration of the rotating body 5 can be suppressed. Therefore, good rotation detection is possible even when an inexpensive magnetic detection unit using the reed switch is used. The rotation detection device A can be configured.

In the embodiment of the present invention, the cylindrical portion 5a is used.
Although the rotating body 5 integrally provided with the rotation transmitting portion 5b using a plus-chip magnet has been described, the rotating body in the present invention has a cylindrical portion 5a having a plurality of magnetic poles and a wheel portion on the cylindrical portion 5a. The rotation transmission unit 5b that transmits rotation may be separately provided.

In each of the embodiments of the present invention, as the rotating body 5, the cylindrical portion 5a having a plurality of magnetic poles and the 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, a concavo-convex portion is provided on the outer periphery (outer surface) of the cylindrical portion of the rotating body mounted on the insertion portion (gear structure), and the concavo-convex portion is rotated. Japanese Patent Application No. 11-5485 previously filed by the applicant of the present application, in which the rotation of the front wheel is transmitted via 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 detector based on No. 0.

[0040]

Industrial Applicability The present invention provides a rotation detecting device which can achieve the initial object and is excellent in vibration resistance even when an inexpensive magnetic reaction element such as a reed switch is used as a magnetic detecting section. Can be provided.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part of the rotation detection device of the same embodiment.

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

FIG. 4 is a view showing a mounting state of the rotation detection device of the embodiment.

FIG. 5 is a cross-sectional view of essential parts showing a rotation detection device according to another embodiment of the present invention.

[Explanation of symbols] 1 housing 1a insertion part 3 Magnetic detector (rotation detector) 5 rotating body 5a cylindrical part 5b Rotation transmission part 5d convex part 10 hubs 11 front wheel (wheel) 12 bearings 12a inner wheel 12b outer wheel 13 axles A rotation detector

Claims (5)

(57) [Claims] 1. A housing having a cylindrical insertion portion, one end of which abuts an inner wheel of a bearing arranged on a hub of the wheel, and an axle passing through the bearing is inserted, and the insertion portion is inserted. A rotating body that includes a cylindrical portion that includes a rotation transmitting portion that rotates the cylindrical portion in synchronization with rotation of the wheel; and a rotation detecting portion that is provided in the housing and that detects rotation of the rotating body. A rotation detecting device, comprising: a convex portion that is provided at a location of the bearing of the rotating body that faces the inner wheel, and that is in contact with the inner wheel. 2. The rotation according to claim 1, wherein the convex portion is partially provided on a peripheral edge of a hole portion through which the insertion portion is inserted, at a position facing the inner wheel. Detection device. 3. The rotation detecting device according to claim 1, wherein the rotating body is made of a magnetic material and is provided with a plurality of magnetic poles in the cylindrical portion. 4. The rotation detecting device according to claim 1, wherein the rotation detecting unit is a reed switch. 5. The rotation detecting device according to claim 1, wherein the rotating body is provided with a plurality of uneven portions on an outer surface of the cylindrical portion.