JP3026265B1 - Rotation detection device - Google Patents

Abstract

An object of the present invention is to provide a rotation detection device capable of obtaining accurate rotation detection without being affected by detection noise due to vibration of an object to be detected. SOLUTION: A housing 1 has an insertion portion 6 through which an axle S is inserted. The detection target 3 has a gear portion (concavo-convex portion) 3a that is mounted on the insertion portion 6 and rotates in synchronization with wheels mounted on the axle S. Magnet (permanent magnet) 9
Is disposed near the gear portion 3a. The magnetism detecting means 8 is provided so as to be in contact with the magnet 9 and detects a change in the magnetic force generated by the magnet 9 caused by the rotation of the gear 3a. The circuit board 10 is provided with the magnetic detecting means 8. The circuit board housing 7 is provided in the housing 1, and the circuit board 10 is arranged so that the magnetic detection means 8 is close to the gear 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device used for two-wheeled vehicles such as motorcycles and bicycles, for transmitting the number of rotations of the wheels of the two-wheeled vehicle to an indicator such as a speedometer. is there.

[0002]

2. Description of the Related Art A conventional electric rotation detecting device is disclosed in Japanese Patent Application Laid-Open No. 2-264817. When such a rotation detection device is used as a rotation detection device for a motorcycle (for example, a motorcycle), a substantially cylindrical resin case having a detection surface for detecting an object to be detected,
A magnetic transducer (Hall IC) mounted on a circuit board and a magnet are arranged along the detection surface, and the circuit board, the magnetic transducer and the magnet are sealed by a sealing member made of epoxy or the like. In general, the rotation detecting device is attached to a transmission case or a sprocket cover, and detects a transmission gear rotating inside the sprocket and a tooth tip of the sprocket as an object to be detected.

[0003]

When a tooth tip of a transmission gear or a sprocket is detected 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 body rigidity, displacement, and the like of a vehicle (two-wheeled vehicle), and the detection position gap between the object to be detected and the rotation detection device fluctuates. There has been a problem that a change in magnetism causes detection noise, which leads to a malfunction of an indicating instrument for displaying speed, for example, according to output data output from the rotation detecting device. Further, when the tooth tip of a transmission gear or a sprocket is used as a detection target, a detection distance between the detection target and a detection surface of a rotation detection device must be adjusted. There is a problem that the mounting work to the device is troublesome.

Accordingly, the present invention is to provide a rotation detecting device which is not affected by detection noise due to the vibration of the object to be detected, can obtain accurate rotation detection, and can reduce the mounting work. It is.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a housing having an insertion portion through which an axle of a two-wheeled vehicle such as a motorcycle or a bicycle is inserted, and a housing mounted on the axle.
Having an uneven portion that rotates in synchronization with the wheel to be inserted,
A permanent magnet disposed near the concave and convex portion, and magnetic detecting means for detecting a change in magnetic force generated from the permanent magnet caused by rotation of the concave and convex portion. It becomes.

Further, a housing having an insertion portion through which an axle of a two-wheeled vehicle such as a motorcycle or a bicycle is inserted ,
Having an uneven portion that rotates in synchronization with the wheel to be mounted,
A state where the object to be detected attached to the insertion part and the permanent magnet
Magnetic detecting means disposed on a circuit board in a state,
And a circuit board housing for arranging the circuit board.
Storing the circuit board in the circuit board storage section.
By providing, the magnetic detecting means is provided on the uneven portion.
Closely arranged and emitted from the permanent magnet
The change caused by the rotation of the uneven portion of the magnetic force is
This is detected by the detecting means.

[0007] Further, a magnetic detection surface is provided on an inner wall of the circuit board housing portion facing the detection surface of the magnetic detection means.

[0008] Further, there is provided a mounting portion for disposing the permanent magnet, and a holder member for disposing the permanent magnet on the circuit board.

[0009] Further, a rotation transmitting member for transmitting the rotation of the wheel to the object to be detected is provided.

[0010] Further, there is provided an engagement portion which engages with the rotation transmitting member and the object to be detected.

[0011] Further, the apparatus has an insertion hole through which the object to be detected is inserted, and has an elastic seal member disposed inside the housing.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a housing 1 is provided with an insertion portion 6 through which a front wheel axle S of a two-wheeled vehicle is inserted. The insertion portion 6 rotates in synchronization with a wheel mounted on the axle S and forms an uneven portion. A detection target 3 made of a magnetic material and provided with a gear portion 3a is provided, and the insertion portion 6 is inserted into the body portion 3b of the detection target 3 (the insertion portion 6 is inserted into the insertion hole 3d of the detection target 3). ) The detection target 3 is attached to the insertion portion 6, and a change in magnetic force generated by rotation of the gear portion 3a of the magnet (permanent magnet) 9 disposed in the housing 1 near the gear portion 3a is applied to the magnet 9. This is a rotation detecting device A that is detected by magnetic detecting means 8 disposed in contact therewith. The rotation detection device A having such a configuration detects the detection target 3 rotating in synchronization with the front wheel by the magnetic detection means 8, and detects the tooth tip of the transmission gear or sprocket, etc., as in the related art. Therefore, the detection noise is not affected by the vibration of the object to be detected, and accurate rotation detection can be obtained.

Further, the circuit board 10 provided with the magnetic detecting means 8 is mounted on the circuit board housing 7 provided in the housing 1.
To be installed in Since the circuit board housing part 7 is provided with the magnetic detection surface 7b for maintaining a good detection distance between the gear part 3a and the magnetic detection means 8, it is possible to detect the transmission gear and the sprocket tooth tip as in the conventional case. Since the troublesome adjustment process of adjusting the detection distance between the body and the detection surface of the rotation detection device is not required, the workability of attaching the rotation detection device A to the motorcycle can be improved.

Further, the elastic seal member 5 is provided with the rotation transmitting member 4.
Since it is disposed inside the housing 1 so as to be located above, the vibration generated from the wheel at the time of running is attenuated at the contact portion between the hub 14 of the wheel wheel and the rotation transmitting member 4, and the hub 14 (recessed portion) The load on the rotation transmitting piece 14c of the rotation transmitting member 14 that abuts on the rotation transmitting member 14c can be reduced, and water, mud, dust and the like can be prevented from entering the inside of the rotation detecting device A.

Further, by disposing a holder member 11 having a mounting recess (mounting portion) 11a for disposing the magnet 9 on the circuit board 10, the magnet 9 and the magnetic detecting means 8 can be arranged on the circuit board 10. The installation position is determined, and assemblability in the circuit board assembly 2 can be improved.

The detection target 3 and the rotation transmitting member 4 are
Since it is configured to include the engaging concave portion (engaging portion) 3c and the engaging convex portion (engaging portion) 4b which engage with each other, the rotational force of the rotation transmitting member 4 that rotates together with the wheel (front wheel) is reduced. Good transmission to the detection target 3 is possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings. 1 is an exploded perspective view showing the entire configuration of the rotation detecting device, FIG. 2 is a cross-sectional view of a main part of the rotation detecting device, FIG. 3 is a cross-sectional view of a main part of a housing, and FIG. 4 is a perspective view showing a circuit board assembly.

1 and 2, the rotation detecting device A is
A housing 1 made of a resin material, a circuit board assembly 2 on which a magnetic detection unit described later is disposed, a detection target 3 housed in the housing 1 and having a gear unit described below, and a front wheel of a motorcycle. Detected object 3
And a resilient seal member 5 made of a rubber material.

The housing 1 is made of a resin material such as polybutylene terephthalate or nylon. Housing 1
Is an axle S for a front wheel of a two-wheeled vehicle, as shown in FIGS.
A cylindrical insertion portion 6 made of a metal material and having an insertion hole 6a through which the hole is inserted is insert-molded. A storage portion 1a is formed at the periphery of the insertion portion 6 for arranging the object 3 to be detected, which will be described in detail later, rotatably with respect to the outer periphery of the insertion portion 6. Further, a step portion 1c for disposing the elastic seal member 5 is formed in the opening 1b of the housing 1.

On the other hand, a housing space 7a for housing a circuit board assembly 2, which will be described in detail later, is provided on the outer peripheral surface of the housing 1.
Is integrally formed so as to protrude outward from the outer peripheral surface. When the circuit board assembly 2 is disposed, the detection surface of the magnetic detection means described below comes into contact with the circuit board housing portion 7, and a magnetic detection surface 7 b for maintaining a good detection distance from the detection target 3. have.

The circuit board assembly 2 is shown in FIGS.
As shown in FIG. 1, the magnetism detecting means 8, a magnet (permanent magnet) 9 provided behind the magnetism detecting means 8, a circuit board 10, and the magnetism detecting means 8 and the magnet 9 are connected to the circuit board 1.
It is composed of a holder member 11 made of a resin material to be disposed at a predetermined position of No. 0 and a wiring cord 12.

The circuit board 10 electrically connects the lead 8a of the magnetic detecting means 8 and the electric wire 12a of the wiring cord 12, and also connects the lead 8a and the electric wire 12a via the wiring pattern 10a. In addition, the circuit board 10 includes
An electronic component 13 composed of a capacitor or the like is mounted on a predetermined land so that noise does not get on the power supply line to the magnetism detecting means 8 and the signal output line from the magnetism detecting means 8.

The holder member 11 includes a mounting recess (mounting portion) 11a for disposing the magnet 9 and a circuit board 10
And support pieces 11b for supporting both end portions of the sheet.
The holder member 11 is supported by a support piece 11b on the non-mounting surface side of the electronic component 13 of the circuit board 10. For example, a notch is formed in the circuit board 10, and the notch and the support piece are formed. The holder member 11 is positioned with respect to the circuit board 10 by making contact with the circuit board 10.

The magnetism detecting means 8 is composed of a magnetic transducer such as a Hall IC or an MR element, and is provided so as to be in contact with a magnet provided in the mounting recess 11a of the holder member 11. Further, the magnetic detecting means 8 is such that the lead 8a is substantially L
By being bent in a letter shape, it is electrically connected to predetermined solder lands of the circuit board 10 by solder.

The magnet 9 has two poles (N pole, S pole)
Pole) and the mounting recess 11 of the holder member 11
a.

The wiring cord 12 supplies power to the magnetic detecting means 8 and transmits an output signal from the magnetic detecting means 8 to an indicating instrument such as a speed meter. The wiring code 12
When the circuit board assembly 2 is installed in the circuit board housing 7, the circuit board assembly 2 is provided on the wall of the circuit board housing 7 via a grommet 18 made of an elastic material such as rubber.

The detection object 3 is formed of a magnetic material and has a substantially cylindrical shape. The detection target 3 has a gear portion 3a having an uneven outer peripheral surface, a body portion 3b located below the gear portion 3a and having a smaller thickness than the gear portion 3a, and a lower end portion of the body portion 3b. In addition to positioning the rotation transmitting member 4 described above, the engaging recess 3c that engages with the rotation transmitting member 4, and the insertion hole 3 through which the insertion portion 6 of the housing 1 is inserted.
d.

The rotation transmitting member 4 is made of a metal material such as aluminum or stainless steel, and has a thin, substantially ring shape.
The rotation transmitting member 4 has an insertion hole 4a through which the insertion portion 6 of the housing 1 is inserted, and an engagement protruding from the periphery of the insertion hole 4a toward the center to engage with the engagement recess 3c of the detection target 3. The protrusion 4b and the extension 14 of the wheel wheel hub 14
and a rotation transmitting piece 4c for rotating the rotation transmitting member 4 together with the hub 14 while being fitted into a concave portion 14b formed in a.

The elastic seal member 5 is made of a rubber material such as nitrile or silicone, and has a thin, substantially ring shape. The elastic seal member 4 is connected to the body 3 b of the detection target 3.
Is formed, and an insertion hole 5a through which the housing 1 is inserted.
A ring-shaped reinforcing member 5b made of a metal material for reinforcement when disposed on the stepped portion 1b is formed by insert.
The elastic seal member 4 is coated with a lubricating member made of grease or the like on the inner wall of the insertion hole 5a serving as a contact surface of the detection target 3 with the body portion 3b so that the rotation of the detection target 3 is not impaired. I have.

The rotation detecting device A is constituted by the components described above.
Is configured. The rotation detection device A is configured such that the detection surface of the magnetic detection means 8 of the circuit board assembly 2 comes into contact with the magnetic detection surface 7b of the circuit board storage section 7 of the housing 1.
It is disposed and fixed by a filling member 15 such as epoxy, and the object 3 is inserted into the insertion portion 6 of the housing 1 via the ring-shaped spacer 16 so that the gear 3a of the object 3 faces the magnetic detection surface 7b of the housing 1. 3, the elastic seal member 5 is mounted on the body 3b of the detection target 3, and the elastic seal member 5 is disposed on the stepped portion 1c of the housing 1, and the rotation transmitting member 4 is engaged with the detection target 3. Engagement protrusion 4b is fitted to mating recess 3c
Are disposed in a state of contacting the lower surface of the elastic seal member 5 so as to be engaged with each other, and a spacer 17 is disposed below the rotation transmitting member 4 so as to detect the object 3, the elastic seal member 6, and the rotation transmitting member. In order to prevent 4 from dropping out of the insertion portion 6,
This is completed by disposing an elastic holding member 17 such as a C-ring in the groove 6b formed at the lower end of the insertion portion 6.

The rotation detecting device A has an axle S, on which a front wheel of a two-wheeled vehicle is mounted, inserted through an insertion portion 6, and is disposed between the front wheel and a front shaft (not shown) of the two-wheeled vehicle. Is established. The rotation detecting device A is configured such that the rotation transmitting piece 4c of the rotation transmitting member 4 is fitted into the recess 14b provided in the hub 14 of the front wheel, whereby the rotation transmitting member 4 and the detection target 3 rotate together with the front wheel, The gear portion 3 formed on the detection target 3
The change of the magnetic pole of the magnet 9 generated by the rotation of the a is detected by the magnetic detecting means 8 and the detected signal is output to an external indicating instrument via the wiring cord 12 so that the indicating instrument of the two-wheeled vehicle can be used. It becomes possible to display the vehicle speed and the like.

Accordingly, by configuring the above-described rotation detecting device A, the detection target 3 rotates in synchronization with the rotation of the front wheel, and the magnet 9 generated by the rotation of the gear 3a of the detection target 3 is rotated. The change of the magnetic pole is detected by the magnetic detection means 8 provided on the magnetic detection surface 7b formed in the circuit board housing part 7. Therefore, the detection noise is not affected by the vibration of the object to be detected, and accurate rotation detection can be obtained.

Further, the circuit board accommodating section 7 has a gear surface 3 corresponding to the detection surface of the magnetic detection means 8 and the detection surface.
By forming the magnetic detection surface 7b that keeps the detection distance with the a good, the detection distance between the detection target of the rotation detection device and the detection target such as the transmission gear and the tip of the sprocket is adjusted. Since such a troublesome adjustment process is not required, the workability of attaching the rotation detecting device A to the motorcycle can be improved.

The elastic sealing member 5 is connected to the rotation transmitting member 4.
Since it is disposed on the stepped portion 1c inside the housing 1 so as to be located above, at the contact portion between the hub 14 of the wheel wheel and the rotation transmitting member 4, vibration from the wheel generated during traveling is attenuated. In addition to reducing the load on the rotation transmitting piece 14c of the rotation transmitting member 14 abutting on the hub 14 (the concave portion 14b), water, mud,
Intrusion of dust and the like can be prevented.

Further, by disposing the holder member 11 having the mounting concave portion 11a for disposing the magnet 9 on the circuit board 10, the arrangement positions of the magnet 9 and the magnetic detecting means 8 with respect to the circuit board 10 are determined. Thus, the assemblability of the circuit board assembly 2 can be improved.

The detected object 3 and the rotation transmitting member 4 are
Since it is configured to include the engaging concave portion 3c and the engaging convex portion 4b that engage with each other, the rotational force of the rotation transmitting member 4 that rotates together with the wheel (front wheel) can be favorably detected.
It can be transmitted to.

In this embodiment, the housing 1 is provided with the circuit board housing 7, and the circuit board assembly 2 is disposed in the circuit board housing 7, and is fixed by the filling member 15. In the rotation detecting device of the invention,
The circuit board assembly is housed in a cylindrical case body, and the case body is mounted on the housing so that the magnetic detection means provided on the circuit board assembly is close to the concave and convex portions of the detected body provided in the housing. ,
The case body may be provided detachably from the housing.

[0038]

According to the present invention, a motorcycle or a motor
A detection object having an insertion portion through which an axle of a two-wheeled vehicle such as a turning vehicle is inserted and having an uneven portion that rotates in synchronization with a wheel mounted on the axle is attached to the insertion portion, and the uneven portion is It is configured to be detected by magnetic detection means,
Unlike the related art, since the detected object does not include the tooth tip of the transmission gear or the sprocket, it is not affected by the detection noise due to the vibration of the detected object,
Accurate rotation detection can be obtained. In addition, since a cumbersome adjustment process for adjusting the detection distance between the object to be detected and the detection surface of the rotation detection device as in the related art is not required, the workability of mounting the rotation detection device can be improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part of the rotation detecting device according to the embodiment.

FIG. 3 is a sectional view of a main part of the housing of the embodiment.

FIG. 4 is an enlarged perspective view showing the circuit board assembly of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Circuit board assembly 3 Detected object 3a Gear part (concavo-convex part) 3c Engagement concave part (engagement part) 4 Rotation transmission member 4a Insertion hole 4b Engagement convex part (engagement part) 4c Rotation transmission piece 5 Elastic seal Member 5a Insertion hole 6 Insertion section 6a Insertion hole 7 Circuit board storage section (storage section) 7b Magnetic detection surface 8 Magnetic detection means 9 Magnet (permanent magnet) 10 Circuit board 11 Holder member 11a Mounting recess (mounting section) 14 Hub A rotation detector S axle

Claims (7)

(57) [Claims] 1. A housing having an insertion portion through which an axle of a two-wheeled vehicle such as a motorcycle or a bicycle is inserted, and mounted on the axle.
Having an uneven portion that rotates in synchronization with the wheel to be inserted,
A detection object mounted on the portion, a permanent magnet disposed in the vicinity of the uneven portion, and magnetic detection means for detecting a change in magnetic force generated from the permanent magnet caused by rotation of the uneven portion. A rotation detecting device, comprising: 2. A housing having an insertion portion through which an axle of a two-wheeled vehicle such as a motorcycle or a bicycle is inserted, and a housing mounted on the axle.
Having an uneven portion that rotates in synchronization with the wheel to be inserted,
To be in contact with the object to be detected and the permanent magnet
Magnetism detecting means disposed on a circuit board, and the housing
Circuit board storage part provided in the
And disposing the circuit board in the circuit board storage section.
The magnetic detecting means is close to the uneven portion.
Magnetic force generated by the permanent magnet
Detecting the change caused by the rotation of the uneven portion of the magnetic field
Means for detecting rotation by means
Place. 3. The rotation detecting device according to claim 2, wherein a magnetic detecting surface is provided on an inner wall of the circuit board housing portion facing the detecting surface of the magnetic detecting means. 4. It has a mounting portion for disposing the permanent magnet,
4. The apparatus according to claim 2 , further comprising a holder member for disposing the permanent magnet on the circuit board.
3. The rotation detecting device according to 1. 5. The apparatus according to claim 1, further comprising a rotation transmitting member that transmits the rotation of the wheel to the detected object.
The rotation detecting device according to any one of claims 1 to 4. 6. The rotation detecting device according to claim 5, further comprising an engagement portion that engages with the rotation transmitting member and the object to be detected. 7. An insertion hole through which the object to be detected is inserted,
The rotation detecting device according to any one of claims 1 to 6, further comprising an elastic seal member disposed inside the housing.