JP5057155B2 - Rotation detector - Google Patents

Description

  The present invention relates to an electric rotation detection device that detects the rotation of a wheel for a motorcycle such as a motorcycle or a bicycle, and transmits the detected signal to a speedometer or the like.

  In a conventional rotation detection device, a magnetic detection element made of a Hall IC or the like mounted on a circuit board and a magnet are arranged in a resin case, and the circuit board, the magnetic detection element, and the magnet are sealed with epoxy or the like. The structure sealed with a stop member is employ | adopted. 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 was detected as a detection target (see, for example, Patent Document 1).

  In such a rotation detection device, vibrations occur in the detected body due to the body rigidity, displacement, etc. of the vehicle (two-wheeled vehicle), and the detection position gap between the detected body and the rotation detection device fluctuates. Therefore, there is a problem that a magnetic change occurs in the rotation detection device, resulting in detection noise, which may cause a malfunction of an indicating instrument that displays speed, for example, according to output data output from the rotation detection device. Was.

  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 wheel (front wheel) in a motorcycle such as a motorcycle, and includes a housing having an insertion portion through which an axle to which the wheel is attached is inserted. A detected object composed of a magnetic medium such as a plastic magnet having a plurality of magnetic poles rotating with the wheel is mounted, and a change in the magnetic pole due to the rotation of the detected object is detected by a magnetic detecting means including a Hall IC. It was a structure.

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

  This rotation detection device is disposed in a state of being sandwiched between the wheel and the front fork. That is, the rotation detection device inserts the axle on which the wheel is mounted into the insertion portion, and inserts the transmission piece into the attachment portion provided on the hub of the wheel, and from the insertion portion to the housing. The axle projecting outward is fixed by a nut member via a front fork, so that the axle is sandwiched between the wheel and the front fork.

  In the manufacturing process of attaching the rotation detection device to the wheel, whether or not the transmission piece is fitted to the attachment portion when the transmission piece of the rotation detection device is fitted to the attachment portion of the hub of the wheel. It was difficult to confirm visually. Therefore, if the rotation detecting device is fastened between the hub and the front fork in an inappropriate state where the transmission piece is not fitted into the mounting portion, the transmission piece constituted by the plastic magnet is damaged. There is a problem that there is a risk of occurrence.

Therefore, paying attention to this problem, even if the rotation detection device is disposed in an inappropriate state on the wheel, the rotation that can be assembled to the wheel without damaging the components of the rotation detection device. The present applicant has proposed that the transmission piece is constituted by an elastic member made of a resin material such as nylon, polyacetal, polyamide, or a metal material such as a spring material rope or an SPC rolling rope as a detection device ( For example, see Patent Document 3).
JP-A-2-264817 JP-A-9-229714 JP 2003-90740 A

  However, in the rotation detection device described above, when the rotation detection device is disposed in an inappropriate state on the wheel and the transmission piece is extremely bent, the transmission piece and its surroundings are plastically deformed. There is a problem that a crack may occur and the transmission piece may be damaged.

  Therefore, the present invention pays attention to the above-mentioned problems and provides a rotation detection device capable of preventing the transmission piece from being damaged even when the rotation detection device is disposed in an inappropriate state on the wheel.

  In order to solve the above problems, the present invention provides a detected object that is mounted on the insertion part of a housing having an insertion part through which an axle is inserted and rotates together with a wheel, and a magnetic field for rotation detection that is provided on the detected object. A detection unit that generates, a rotation transmission unit that includes an elastic member that is provided in the detection object and transmits the rotation of the wheel to the detection unit, and a transmission piece that is formed in the rotation transmission unit and contacts the wheel. And a rotation detecting device that detects the rotation of the detected object by a magnetic detection means, wherein the rotation transmitting portion is provided with a lightening portion at the base of the transmitting piece.

  Moreover, this invention forms the said hollowing part larger than the width | variety of the base of the said transmission piece.

  Moreover, this invention makes it the hole which penetrated the said hollow part.

  According to the present invention, it is possible to provide a rotation detection device that can achieve the intended purpose and can prevent the transmission piece from being damaged even if the rotation detection device is disposed in an inappropriate state on the wheel. .

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. For example, a rotation detection device that detects the number of rotations of a motorcycle wheel will be described as an example.

  A rotation detection device A according to a first embodiment of the present invention includes a housing 1 made of a resin material, a circuit board 2 provided with a predetermined wiring pattern (not shown), a magnetic detection element (magnetic detection means) 3, and rubber. The seal member 4 is made of a material, and the detected object 5 is constituted. Reference numeral 10 denotes a front wheel wheel to which the rotation detection device A is attached.

  The housing 1 is made of a resin material such as polybutylene terephthalate or nylon, and an axle S is inserted in the approximate center of the housing 1 and a cylindrical insertion portion 1a made of a metal material is insert-molded. A first storage portion 1b is formed on the periphery of the insertion portion 1a. The first storage portion 1b is disposed on the periphery of the insertion portion 1a so that the detected object 5 to be described in detail later is rotatable. A second storage portion 1c that stores the circuit board 2 and the magnetic detection element 3 mounted on the circuit board 2 is formed outside 1b. Further, a skirt portion 1 d that protrudes toward the front wheel 10 is formed on the outer periphery of the housing 1 (periphery of the first storage portion 1 b).

  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 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 second housing portion 1c with a sealing member 11 made of epoxy resin or the like after being disposed in the second housing portion 1c.

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

  The sealing material 4 is made of a rubber material such as nitrile or silicon, and has a ring shape. The seal member 4 prevents sand and dust from entering the first storage portion 1b of the housing 1.

  The detected body 5 is formed with a cylindrical portion (detecting portion) 5a through which the insertion portion 1a of the housing 1 is inserted, and the surface of the cylindrical portion 5a is magnetized with, for example, eight poles. In addition, the cylindrical part 5a is comprised from a plastic magnet etc., for example. The detected object 5 is made of an elastic member made of a resin material such as nylon, polyacetal, polyamide, or a metal material such as a spring material rope or an SPC rolling rope, and is a protrusion formed on the hub 10a of the front wheel 10. The rotation transmission part 5c which has the two transmission pieces 5b contact | abutted to 10b is provided.

  The transmission piece 5b and the rotation transmission part 5c are connected by two arms 5d, and the two arms 5d are provided with a lightening part 5e formed of a through-hole at the base of the transmission piece 5b. . By providing the cutout portion 5e, the transmission piece 5b can be easily bent at the portion of the arm 5d, and damage to the transmission piece 5b and its peripheral portion can be suppressed.

  Further, the width W1 of the thinned portion 5e is formed larger than the base width W2 of the transmission piece 5b, so that the arm 5d can be lengthened and easily bent at the portion of the arm 5d, and the transmission piece 5b or The damage of the surrounding part can be suppressed.

  The cylindrical portion 5a and the rotation transmission portion 5c are integrally formed by insert molding. When the detected body 5 is rotated, the cylindrical portion 5a and the rotation transmission portion 5c are separated from each other, and the rotation transmission is performed. The part 5c is formed so as not to idle.

  In addition, in this embodiment, the to-be-detected body 5 comprised the cylindrical part 5a and the rotation transmission part 5c by insert molding, but the to-be-detected body 5 has the cylindrical part 5a and the rotation transmission part 5c. The structure couple | bonded by uneven | corrugated fitting may be sufficient.

  The rotation detecting device A is configured by the above-described units.

  In the rotation detection device A, the transmission piece 5b of the rotation transmission portion 5c formed on the detected portion 5 is formed on the hub 10a of the front wheel 10 when the vehicle is mounted on a vehicle (two-wheeled vehicle) in the manufacturing process. When it is tightened between the front fork (not shown) and the front wheel 10 while being in contact with the protruding portion 10b (hereinafter referred to as an inappropriate state), the transmission piece 5b of the rotation transmitting portion 5c Although the deformed portion 5e is deformed as shown by the solid line in FIG. 1, the protrusion 10b is transmitted by rotating the front wheel 10 with the rotation detection device A assembled to the front wheel 10. Sliding with respect to the piece 5b, the transmission piece 5b of the rotation transmitting portion 5c can be restored to the original state (the transmission piece 5b indicated by a dotted line in FIG. 1). Therefore, it is possible to restore the transmission piece 5b of the rotation transmission portion 5c to its original state and arrange it in a proper state on the protrusion 10b formed on the hub 10a. Therefore, the detected object 5 is not damaged as in the conventional rotation detecting device A, so that the detected object 5 is not replaced (replacement of components) or the rotation detecting device A itself is not replaced. Therefore, it is possible to improve the yield of the rotation detection device A in the manufacturing process.

  Moreover, even if the rotation detection device A is disposed in an inappropriate state on the wheel and the transmission piece 5b is extremely bent as in the past, the through hole 5e provided at the base of the transmission piece 5b The arm 5d and its surroundings can be easily deformed, and cracks and breakage of the transmission piece 5e can be suppressed.

Sectional drawing which shows the rotation detection apparatus of 1st embodiment of this invention. The side view of the to-be-detected body of the embodiment. The back view of the to-be-detected body of the embodiment. Sectional drawing of the BB line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1a Insertion part 1b 1st accommodating part 1c 2nd accommodating part 1d Skirt part 2 Circuit board 3 Magnetic detection element 4 Seal member 5 Detected object 5a Cylindrical part (detection part)
5b Transmission piece 5c Rotation transmission part 5d Arm 5e Thinning part 10 Front wheel 10a Hub 10b Projection part 11 Sealing member A Rotation detection device S Axle

Claims (3)

A detected body that is mounted on the insertion portion of a housing having an insertion portion through which an axle is inserted and rotates together with a wheel, a detection portion that is provided in the detected body and generates a magnetic field for detecting rotation, and the detected body A rotation transmission portion comprising an elastic member that transmits rotation of the wheel to the detection portion; and a transmission piece that is formed on the rotation transmission portion and contacts the wheel, and detects the rotation of the detected object magnetically. In the rotation detection device that detects by means, the rotation transmission unit is characterized in that a hollow portion is provided at the base of the transmission piece. The rotation detecting device according to claim 1, wherein the lightening portion is formed larger than a width of a base of the transmission piece. The rotation detection device according to claim 1, wherein a hole is formed through the hollow portion.

Images