JP2012189530A - Rotation angle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive rotation angle detection device to be used for detecting a rotation angle of a steering of an automobile, using a reduced number of parts.SOLUTION: A connector part 20A is formed integrally with a cover 20. The connector part 20A has a substantially box shape opened externally with a terminal 21 penetrating through a side wall part 20B from the inside to the outside. A wiring board 17 is connected to a connection part 21A of the inside terminal 21. The inexpensive rotation angle detection device using a reduced number of parts includes the cover 20 formed integrally with the connector 20A.

Description

  The present invention relates to a rotation angle detection device mainly used for detecting a rotation angle of a steering wheel of an automobile.

  In recent years, with the advancement of functions of automobiles, there are an increasing number of devices that detect the rotation angle of a steering using various rotation angle detection devices and perform various controls of the vehicle using the rotation angle.

  Such a conventional rotation angle detection device will be described with reference to FIGS.

  3 is a cross-sectional view of a conventional rotation angle detecting device, and FIG. 4 is an exploded perspective view thereof. In FIG. 3, reference numeral 1 denotes a synthetic resin rotating body having a spur gear portion 1A formed on the outer periphery of the side surface. A pair of engaging portions 1B that engage with a shaft of a steering (not shown) to be inserted is formed on the inner periphery of the portion.

  Reference numeral 2 denotes a synthetic resin first detection body having a spur gear portion 2A formed on the outer periphery of the side surface, and 3 a synthetic resin having a spur gear portion 3A having a different number of teeth from the spur gear portion 2A on the outer periphery of the side surface. The spur gear portion 2A of the first detection body 2 is engaged with the spur gear portion 1A of the rotating body 1 and the spur gear portion 3A of the second detection body 3 is the first detection. The spur gear portion 2A of the body 2 is engaged.

  Reference numeral 4 denotes a case in which a substantially circular opening is formed on the right side. The rotating body 1 is provided on the substantially cylindrical support portion 4A on the back surface, and the first detection body 2 and the second detection body are provided on the shaft portion 4B. 3 is rotatably supported, and a magnet 5 is fixed to the center lower surface of the first detector 2 and a magnet 6 is fixed to the center lower surface of the second detector 3 by insert molding or the like.

  Further, reference numeral 7 denotes a wiring board disposed substantially in parallel below the first and second detection bodies 2 and 3, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. The magnet 5 and the magnet 6 of the second detection body 3 are mounted on opposite surfaces of the magnetism detection elements 8 and 9, respectively, and connected to the magnetic detection elements 8 and 9 by electronic components such as a microcomputer. The control means 10 is formed.

  Reference numeral 11 denotes a connection body in which a plurality of substantially L-shaped terminals 11C are insert-molded in a synthetic resin holding portion 11A, and the holding protrusions 11B on the upper surface are fitted in the holding holes 7A of the wiring board 7, and the terminals One end on the right side of 11C is inserted into the connection hole 7B of the wiring board 7 and mounted by soldering or the like, and the connection body 11 is mounted on the wiring board 7.

  Reference numeral 12 denotes a cover provided with a substantially circular opening on the right side. The boss 4C on the back surface of the case 4 is inserted into the positioning hole 7C of the wiring board 7 so that the wiring board 7 is positioned with respect to the case 4, A cover 12 covers the lower side of the case 4 in which the rotating body 1 and the first and second detection bodies 2, 3, etc. are housed, thereby constituting a rotation angle detecting device.

  In addition, such a rotation angle detecting device is connected to a male connector (not shown) of a lead wire wired from the automobile body on the other end on the left side of the terminal 11C of the connection body 11, and the engagement of the rotation body 1. A steering shaft is inserted into the joint portion 1B and attached to the automobile.

  In the above configuration, when the steering wheel is rotated, the rotating body 1 locked to the steering shaft is rotated, and the first detecting body 2 is interlocked with the first detecting body 2 and the second detecting body 2 is interlocked with the rotating body 1. Therefore, the magnets 5 and 6 mounted at the center of these detection bodies 3 also rotate.

  The magnetic detection elements 8 and 9 detect the magnetic forces of the magnets 5 and 6 whose directions change with rotation as detection signals each having a voltage waveform of a sine wave or a cosine wave. Since the second detection body 3 has a different number of teeth and a different rotation speed, the data waveforms of the magnetic detection elements 8 and 9 become detection signals having different periods and shifted phases.

  Further, the control means 10 performs a predetermined calculation from the two different detection signals from the first detection body 2 and the second detection body 3 and the number of teeth of each, and the rotation of the rotating body 1, that is, the steering wheel. While detecting an angle, this angle is output to the electronic circuit of a motor vehicle, and it is comprised so that various control of a vehicle may be performed.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2005-214763 A

  However, in the above conventional rotational angle detection device, the terminal 11C is insert-molded into the holding portion 11A to produce the connection body 11, and the connection body 11 is mounted on the wiring board 7 and mounted. There was a problem that the number of points was large and it was likely to be expensive.

  The present invention solves such a conventional problem, and an object of the present invention is to provide an inexpensive rotation angle detection device with a small number of parts.

  In order to achieve the above object, the present invention has the following configuration.

  According to the first aspect of the present invention, the cover has a substantially box-like shape with an outward opening, and a connector portion in which a terminal penetrates inwardly and outwardly is formed integrally on the side wall portion, and at the connection portion of the inner terminal. Since the wiring board is connected and the connector portion is integrally formed on the cover, there is no need for a separate part such as a connection body, and there is an effect that an inexpensive product with a small number of parts can be obtained.

  The invention according to claim 2 is the invention according to claim 1, wherein the outer other end of the terminal is arranged substantially parallel to the wiring board, and the connection portion of the terminal is bent into a substantially U shape. For example, the wiring board can be placed from above on a substantially U-shaped connection part facing upward of the terminal, and the terminal connection part can be easily inserted into the connection hole of the wiring board. Since the part and the wiring board do not overlap in the vertical direction and can be arranged next to each other, the assembly can be easily made thin.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that an inexpensive rotation angle detection device with a small number of parts can be realized.

Sectional drawing of the principal part of the rotation angle detection apparatus by one embodiment of this invention Exploded perspective view Sectional view of the main part of a conventional rotation angle detection device Exploded perspective view

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a cross-sectional view of a main part of a rotation angle detecting device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, in which 1 is a synthetic resin having a spur gear portion 1A formed on the outer periphery of a side surface. A pair of engaging portions 1B that are engaged with a shaft of a steering (not shown) that is inserted through the inner periphery of the central cylinder portion.

  2 is a first detection body made of synthetic resin such as polyoxymethylene having a spur gear portion 2A formed on the outer periphery of the side surface, and 3 is a spur gear portion 3A having a different number of teeth from the spur gear portion 2A on the outer periphery of the side surface. In the formed second detection body made of synthetic resin such as polyoxymethylene, the spur gear portion 2A of the first detection body 2 meshes with the spur gear portion 1A of the rotating body 1 and the second detection body 3 The spur gear portion 3 </ b> A meshes with the spur gear portion 2 </ b> A of the first detection body 2.

  Reference numeral 14 denotes a case made of a synthetic resin such as polybutylene terephthalate having a substantially circular opening formed on the right side. The rotating body 1 is attached to the substantially cylindrical support portion 14A on the back surface, and the first shaft portion 14B is first. The detection body 2 and the second detection body 3 are rotatably supported.

  Furthermore, a magnet 5 is fixed to the lower surface of the center of the first detector 2 and a magnet 6 is fixed to the lower surface of the center of the second detector 3 by insert molding or the like.

  Reference numeral 17 denotes a wiring board such as paper phenol or glass-filled epoxy disposed substantially in parallel below the first and second detection bodies 2 and 3, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. At the same time, an AMR (anisotropic magnetoresistive) element or the like is formed on the opposing surface of the magnet 5 mounted at the center of the first detector 2 and the magnet 6 mounted at the center of the second detector 3. Magnetic detecting elements 8 and 9 are respectively mounted.

  The first detection means is formed by the magnet 5 and the magnetic detection element 8 opposed to each other, and the second detection means is formed by the magnet 6 and the magnetic detection element 9, respectively. The control means 10 connected to the magnetic detection elements 8 and 9 is formed by these electronic components.

  Reference numeral 20 denotes a cover made of synthetic resin such as polybutylene terephthalate having a substantially circular opening on the right side. The left side has a substantially box shape with an opening outward, and a plurality of terminals 21 are formed by insert molding or the like. A connector portion 20 </ b> A fixed through the side wall portion 20 </ b> B from one side to the outside is integrally formed.

  The terminal 21 has a connecting portion 21A having an inner end formed in a substantially U shape and a tip extending upward, and an outer terminal portion 21B having an outer other end arranged substantially parallel to the bottom surface of the cover 20. The connection portion 21A is inserted into a plurality of connection holes 17A provided at the rear end of the wiring board 17 and fixed by soldering or the like.

  The wiring board 17 is substantially parallel to the outer terminal portion 21B and is arranged adjacent to the right side of the connector portion 20A.

  Further, the substantially cylindrical positioning boss 20C of the cover 20 is inserted into the plurality of positioning holes 17B of the wiring board 17 so that the wiring board 17 is positioned on the cover 20 and slightly above the extension line of the outer terminal portion 21B. It is held at the lower position and attached to the cover 20.

  As described above, the wiring board 17 is arranged substantially parallel to the outer terminal portion 21B, and the wiring board 17 is arranged next to the side wall portion 20B on the right side of the connector portion 20A, so that the substantially U-shaped connection portion 21A is arranged. When the tip is directed upward, the wiring board 17 can be easily fitted from above when the connection portion 21A is inserted into the connection hole 17A of the wiring board 17, and the wiring board 17 can be easily assembled. And the connector portion 20A can be arranged next to each other in the left-right direction, so that the height in the vertical direction is lower and thinner than when the connection body is mounted on the wiring board as in the background art. .

  Then, the positioning boss 20C of the cover 20 is fitted into the positioning recess 14C on the back surface of the case 14, so that the wiring board 17 and the case 14 are positioned at predetermined positions with respect to the cover 20, and the case 14 covers the cover 20 above. Thus, a rotation angle detection device is configured.

  In addition, such a rotation angle detection device has a male connector (not shown) of a lead wire wired from the automobile body connected to the outer terminal portion 21B of the terminal 21 of the connector portion 20A, and the rotating body 1 The steering shaft is inserted into the engaging portion 1B and attached to the automobile.

  In the above configuration, when the steering wheel is rotated, the rotating body 1 locked to the steering shaft is rotated, and the first detecting body 2 is interlocked with the first detecting body 2 and the second detecting body 2 is interlocked with the rotating body 1. Therefore, the magnets 5 and 6 mounted at the center of these detection bodies 3 also rotate.

  The magnetic detection elements 8 and 9 detect the magnetic forces of the magnets 5 and 6 whose directions change with rotation as detection signals each having a voltage waveform of a sine wave or a cosine wave. Since the second detection body 3 has a different number of teeth and a different rotation speed, the data waveforms of the magnetic detection elements 8 and 9 become detection signals having different periods and shifted phases.

  At this time, the wiring board 17 on which the magnetic detection elements 8 and 9 are mounted is positioned with the cover 20 by the positioning hole 17B and the positioning boss 20C of the cover 20, and the first and second detection bodies 2, 3 are also positioned. Since the positioning recess 14C is also fitted to the positioning boss 20C and the cover 20, the wiring board 17, and the case 14 are positioned with respect to each other, the magnets 5, 6 and the like formed by a combination of these are also provided. The center deviation between the opposing magnetic detection elements 8 and 9 is small, and the error of each detection signal is small.

  Further, the control means 10 performs a predetermined calculation from the two different detection signals from the first detection body 2 and the second detection body 3 and the number of teeth of each, and the rotation of the rotating body 1, that is, the steering wheel. While detecting an angle, this angle is output to the electronic circuit of a motor vehicle, and it is comprised so that various control of a vehicle may be performed.

  As described above, according to the present embodiment, the cover 20 is formed in a substantially box shape with an outward opening, and the connector portion 20A in which the terminal 21 penetrates inward and outward is integrally formed in the side wall portion 20B, and the inner terminal 21 is formed. By connecting the wiring board 17 to the connecting portion 21A, the connector portion 20A is integrally formed with the cover 20, so that, as described in the background art, a separate part such as a connecting body is not necessary, and the number of parts is reduced. A small and inexpensive product can be realized.

  In addition, the outer terminal portion 21B of the terminal 21 is arranged substantially parallel to the wiring board 17, and the connection portion 21A of the terminal 21 is bent into a substantially U shape so as to be connected in a substantially U shape facing upward. The wiring board 17 can be placed on the part 21A from above and the connection part 21A can be easily inserted into the connection hole 17A of the wiring board 17, and the connector part 20A and the wiring board 17 do not overlap each other in the vertical direction. Since they can be arranged together, it is easy to assemble and can be made thin.

  In the above description, it is assumed that the rotation angle detecting device is provided with the rotating body 1 that engages and interlocks with the steering shaft, and the first and second detection bodies 2 and 3 that are interlocked with the rotating body 1. As described above, the rotating body is fixed to the steering shaft, and the rotation angle detecting device is provided with the first and second detecting bodies, the first and second detecting means and the control means, and is fixed to the steering shaft. It is possible to implement the present invention even if the first detecting body is engaged with the rotating body and the first and second detecting bodies are interlocked to detect the rotation angle of the rotating body. .

  Further, in the above description, the first and second detection bodies 2 and 3 and the first and second detection means have been described as detecting the rotation angle of the rotary body 1, but the storage means is provided in the control means. The present invention can be applied even if the first detecting body is provided in conjunction with the rotating body and the rotation angle is detected by the detection signal only from the first detecting means.

  The rotation angle detection device according to the present invention can provide an inexpensive rotation angle detection device with a small number of parts, and is useful for detecting the rotation angle of an automobile steering.

DESCRIPTION OF SYMBOLS 1 Rotating body 1A, 2A, 3A Spur gear part 1B Engagement part 2 1st detection body 3 2nd detection body 5, 6 Magnet 8, 9 Magnetic detection element 10 Control means 14 Case 14A Support part 14B Shaft part 14C Positioning Concave part 17 Wiring board 17A Connection hole 17B Positioning hole 20 Cover 20A Connector part 20B Side wall part 20C Positioning boss 21 Terminal 21A Connection part 21B External terminal part

Claims (2)

A detection body that rotates in conjunction with a rotating body that rotates in response to a steering rotation operation, a magnet that is fixed to the detection body, a magnetic detection element that is disposed opposite to the detection body, and a magnetic detection element A control means for detecting a rotation angle of the rotating body from a detection signal, a wiring board on which the magnetic detection element and the control means are mounted, and a cover in which the wiring board is stored. A rotation angle detecting device having a substantially box-like shape, having a connector portion with a terminal penetrating inward and outward on a side wall portion, and connecting the wiring board to a connection portion of the inner terminal. The rotation angle detection device according to claim 1, wherein the other end of the terminal is disposed substantially parallel to the wiring board, and the connection portion of the terminal is bent into a substantially U shape.

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