JP4911279B2 - Rotation detector - Google Patents

Description

  The present invention relates to a rotation detection device, for example, a rotation detection device for a two-wheeled vehicle such as a motorcycle or a bicycle.

  A rotation detection device is disclosed in Patent Document 1. This rotation detection device is a Hall IC mounted on a circuit board on a substantially cylindrical resin case having a detection surface for detecting a detection target. And a magnet is arranged along the detection surface, and the circuit board, the magnetic detection element, and the magnet are sealed with a sealing member made of epoxy or the like. Yes. When this rotation detection device is used as a rotation detection device for a two-wheeled vehicle (for example, a motorcycle), the rotation detection device is attached to a vehicle mission case, a sprocket cover, etc. It is common to detect as an object to be detected.

  When such a rotation detection device is used to detect a transmission gear, sprocket, or the like as a detected object, the detected object has some clearance, so the body rigidity and displacement of the vehicle (two-wheeled vehicle) The detection object is vibrated from the above, and the detection position gap between the detection object and the rotation detection device fluctuates. Therefore, a magnetic change occurs in the rotation detection device, resulting in detection noise. Depending on the output data output from the apparatus, for example, there is a problem that it may cause a malfunction of the indicating instrument that displays the speed. Focusing on this problem, the applicant of the present application has proposed a rotation detection device disclosed in Patent Document 2.

  This rotation detection device is attached to a front wheel (wheel) of a two-wheeled vehicle such as a motorcycle, and includes a housing having an insertion portion through which an axle to which the front wheel wheel is attached is inserted. A magnetic detection means comprising a plurality of magnetic poles rotating together with the front wheel, mounted on a detection object made of a magnetic medium such as a plastic magnet, and a change in the magnetic pole caused by rotation of the detection object made of a Hall IC or the like It is a structure to detect by.

  The object to be detected is formed by integrally forming a cylindrical portion having the magnetic pole and a rotation transmitting piece for transmitting rotation of the front wheel to the cylindrical portion by a plastic magnet or the like. The rotation transmission piece is formed to be drawn outward from the cylindrical portion on the opening side of the housing so as to correspond to a concave-shaped mounting portion provided on the hub of the front wheel. It is provided at a plurality of locations on the periphery.

The rotation detection device having such a configuration is disposed in a state of being sandwiched between the front wheel and the front fork. That is, the rotation detection device inserts the axle on which the front wheel is mounted into the insertion portion, and inserts the rotation transmission piece into the attachment portion provided on the hub of the front wheel, and the insertion portion The axle projecting outward from the housing is fixed by a nut member via the front fork so that it is pinched (co-fastened) between the front wheel and the front wheel. Established.
JP-A-2-264817 JP-A-9-229714

  When the rotation detection device is attached to the hub, the detected object is rotatably inserted into the insertion portion of the housing. Therefore, the rotation transmission piece of the rotation detection device is attached to the attachment portion of the hub. When fitting, only the object to be detected may rotate, and the rotation transmission piece may not fit into the mounting part, and it is confirmed visually whether or not the rotation transmission piece fits into the mounting part. Is difficult. Therefore, when the rotation detecting device is fastened between the hub and the front fork in an inappropriate state where the rotation transmitting piece is not fitted into the mounting portion, the rotation transmitting piece configured by the plastic magnet is used. There is a problem that there is a risk of damage.

  The present invention pays attention to the above-mentioned problems, and provides a rotation detection device capable of preventing damage to a detected object and assembling the rotation detection device to a wheel hub.

The present invention provides a rotation detection device arranged between a wheel hub and a front fork as in the rotation detection device according to claim 1, wherein the insertion is for inserting an axle on which the wheel is mounted. A housing having a portion, a detected body made of a magnetic metal having a detected portion and a base portion supporting the detected portion, and the detected portion being changed in a magnetic field. A magnetic detecting element for detecting, a fixing portion that is positioned and fixed in the rotation direction of the hub at an end portion of the hub is provided on the base portion, and at least two projecting portions are provided at the end portion of the hub, and the fixing The portion includes a pair of convex portions that are fixed with the protruding portion interposed therebetween, and the detected body rotates together with the hub.

According to a second aspect of the present invention, there is provided the rotation detecting device according to the first aspect, wherein the convex portion contacts a surface of the protruding portion with respect to the rotation direction of the hub.

  The present invention relates to a rotation detecting device disposed between a hub of a wheel and a front fork, a housing having an insertion portion for inserting an axle on which the wheel is mounted, and a housing disposed in the housing. A detected object made of magnetic metal having a detected part and a base part that supports the detected part; and a magnetic detection element that detects the detected part by a change in a magnetic field, and the base part A rotation detecting device in which an end portion of the hub is positioned and fixed in the rotation direction of the hub, and the detected object rotates together with the hub. The device can be assembled to the wheel hub.

  Hereinafter, a case where an embodiment of the present invention is applied to, for example, an electric rotation detection device that detects the rotation speed of a motorcycle wheel will be described with reference to the accompanying drawings.

  1 to 3, the rotation detection device A includes a housing 1, a circuit board 2, a magnetic detection element 3, a seal member 4, and a detection target 5.

  The housing 1 is made of a resin material such as polybutylene terephthalate or polyamide, and an axle S on which a front wheel (wheel) of a two-wheeled vehicle is mounted is inserted through a substantially central portion of the housing 1 to form a cylindrical shape made of a metal material. The insertion part 1a is insert-molded. Formed on the periphery of the insertion portion 1a is a first storage portion 1b for rotatably disposing a detection portion 5a of the detection target 5 to be described later on the outer periphery of the insertion portion 1a. A second storage portion 1c in which a fixing portion 5c of the detection object 5 to be described in detail later can be rotated is formed at a position continuous from the first storage portion 1b via a stepped portion. This second storage portion A third storage portion 1d in which a seal member 4 which will be described in detail later is disposed is formed at a position continuous from 1c via a step portion. In addition, a fourth storage portion 1e that stores the circuit board 2, the magnetic detection element 3 mounted on the circuit board 2, the magnet 3a, and the holder 3b is formed on one outer side from the first storage portion 1b. Yes.

  The circuit board 2 has a predetermined wiring pattern formed on a substrate made of an insulating material such as glass epoxy, and an electronic component (not shown) made of a magnetic detection element 3 and a capacitor is electrically fixed by solder or the like. . Further, the circuit board 2 is provided with a holder 3b that holds a magnet 3a located behind the magnetic detection element 3. Further, the circuit board 2 is provided with a wiring cord (not shown) for supplying power to the magnetic detection element 3 and transmitting an output signal from the magnetic detection element 3 to an indicator (not shown) (for example, a speedometer). The wiring cord is electrically connected to a predetermined portion of the circuit board 2 by soldering. The circuit board 2 is disposed and fixed by filling the fourth housing portion 1e with a sealing member 6 made of epoxy resin or the like after being disposed in the fourth housing portion 1e.

  The magnetic detection element 3 includes a Hall IC, an MR element (semiconductor magnetoresistive element), and the like, and detects a change in the magnetic field accompanying the movement of the detection target 5.

  The seal member 4 is made of a rubber material such as nitrile or silicon, and the seal member 4 has a thin donut shape. Since the outer shape of the seal member 4 is slightly larger than the side wall of the third storage portion 1d of the housing 1, the seal member 4 is disposed and fixed to the third storage portion 1d by press fitting. Therefore, when the rotation detection device A is disposed on the hub 10a (mounting portion) of the front wheel 10, the outer surface of the cylindrical portion 10b of the hub 10a and the inner surface of the seal member 4 come into contact with each other, so This prevents intrusion of dust, dirt or moisture.

  On the end surface of the cylindrical portion 10b of the hub 10a, a protruding portion 10c is provided at a point-symmetrical position about the rotation center of the hub 10a. The projecting portion 10c has a circular cross section in a direction perpendicular to the rotation axis of the hub 10a. A ball bearing 11 is provided as a bearing in the space inside the cylindrical portion 10b of the hub 10a.

  The detected object 5 is made of a metal having magnetism, for example, a metal containing iron, and is made of a plate-like protruding piece having an arcuate cross-sectional shape that is spaced apart from the periphery of the insertion portion 1a of the housing 1. The detection portion 5a and a lower end of the detection portion 5a are provided with a plate-like base portion 5b having a ring shape, and the detection target 5 is integrally formed with the detection portion 5a and the base portion 5b. ing. In the present embodiment, in order to generate two pulses by one rotation of the hub 10a, two detected portions 5a are provided. Note that when the hub 10a generates four pulses per rotation, the number of detected portions 5a is four. When the hub 10a generates n pulses per rotation, the n detected portions 5a may be provided.

The base portion 5b is formed with a fixing portion 5c that is fixed to the protruding portion 10c formed at the end of the cylindrical portion 10b of the hub 10a of the front wheel 10. The fixing portion 5c is formed of a concave notch having a size substantially the same as that of the protruding portion 10c of the hub 10a on the outer peripheral portion of the base portion 5b. The opposite side of the notch contacts the side surface of the protruding portion 10c. The detected body 5 is fixed to the hub 10a by sandwiching the protrusion 10c between the pair of protrusions 5d. This fixing is firmly fixed so that the detection target 5 does not easily come off from the hub 10a. And when fixing the to-be-detected body 5 to the hub 10a, the fixing | fixed part 5c of the to-be-detected body 5 will be fixed by pushing in (press-fit) the protrusion part 10c, applying a pressure. Moreover, the to-be-detected body 5 is being fixed, positioning in the rotation direction of the hub 10a because the convex part 5d is contacting the surface with respect to the rotation direction of the hub 10a of the protrusion part 10c.

  In this embodiment, the protrusion 5d is fixed in contact with the surface of the protrusion 10c with respect to the rotation direction of the hub 10a. However, the present invention is not limited to this embodiment, and the inside of the two protrusions 10c. Alternatively, it may be press-fitted and fixed.

The rotation detection device A is assembled to the hub 10a by positioning the fixed portion 5c of the detected body 5 on the protrusion 10c provided at the end of the hub 10a so as not to move in the rotation direction of the hub 10a. Keep it fixed. Then, the housing 1 of the rotation detecting device A assembled while flexing the seal member 4 into the cylindrical portion 10b of the hub 10a, finally, fixed sandwich at a front fork (not shown) the hub 10a.

The rotation detecting device A is configured by the above-described units. Such a rotation detection device A is configured such that when the detected body 5 rotates with the hub 10a when the rotation detected device A is attached to the mounting portion of the hub 10a by fixing the detected body 5 to the hub 10a in advance, Since the detected body 5 does not contact the second and third storage portions 1b and 1c of the housing 1 of the rotation detection device A, the detected body 5 can be prevented from being damaged.

Further, the hub 10a includes at least two protrusions 10c at the end thereof, and the fixing part 5c includes a pair of protrusions 5d fixed with the protrusion 10c interposed therebetween, whereby the hub 10a rotates the detected object 5. Even so, it can be stably fixed.

  Further, the convex portion 5d provided on the fixing portion 5c comes into contact with the surface of the protruding portion 10c with respect to the rotation direction of the hub 10a, thereby positioning in the rotation direction of the hub 10a and fixing at the same time.

The principal part sectional view of the rotation detector which shows the embodiment of the present invention. Sectional drawing of the BB line in FIG. The perspective view of the hub and to-be-detected body of embodiment same as the above.

Explanation of symbols

A rotation detection device 1 housing 1a insertion portion 1b first storage portion 1c second storage portion 1d third storage portion 1e fourth storage portion 2 circuit board 3 magnetic detection element 4 seal member 5 detected object 5a detected Part 5b Base part 5c Fixed part 5d Convex part 10 Front wheel (wheel)
10a Hub 10b Tubular part 10c Protruding part S axle

Claims (2)

A rotation detection device disposed between a hub of a wheel and a front fork, the housing including an insertion portion for inserting an axle on which the wheel is mounted, and disposed in the housing, A detection object made of a metal having magnetism having a detection part and a base part that supports the detection part; and a magnetic detection element that detects the detection part by a change in a magnetic field; A fixing portion that is positioned and fixed in the rotation direction of the hub is provided at an end portion, and at least two projecting portions are provided at the end portion of the hub, and the fixing portion includes a pair of convex portions that are fixed with the projecting portion interposed therebetween. The rotation detection device , wherein the detected object rotates together with the hub. The rotation detecting device according to claim 1 , wherein the convex portion contacts a surface of the projecting portion with respect to a rotation direction of the hub.

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