JP6056009B2 - Rotation angle detector - Google Patents

Description

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

  In recent years, as the functions of automobiles have been improved, the number of steering angle detected by using various rotation angle detection devices to control various types of vehicles has been increasing.

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

  FIG. 6 is a cross-sectional view of a conventional rotation angle detecting device. In FIG. 6, reference numeral 1 denotes a substantially cylindrical rotating body having spur gears formed on the outer periphery of the side surface, and a steering shaft (not shown) inserted through the inner periphery. 1A is engaged.

  Reference numeral 2 denotes a detection body in which a spur gear having a different number of teeth from the rotating body 1 is formed on the outer periphery of the side surface. Reference numeral 3 denotes a substantially box-shaped cover made of an insulating resin. The rotating body 1 and the detection body 2 are rotatably mounted on the lower surface of the cover 3 while meshing with the gear.

  Reference numeral 4 denotes a wiring board arranged substantially in parallel below the detection body 2. A plurality of wiring patterns (not shown) are formed on the upper and lower surfaces, and a magnet mounted on the lower center surface of the detection body 2. A magnetic detection element 6 is mounted and mounted on the upper surface of the wiring board 4 below 5 and arranged opposite to the magnet 5.

  Furthermore, 7 is a substantially L-shaped conductive metal terminal, the middle part is insert-molded in the left side wall, the plurality of terminals 7 are fixed to the cover 3, and the lower ends of the plurality of terminals 7 are the wiring board. 4 is fixedly connected by soldering, and the left end extends from the left side wall of the cover 3 into the outer rectangular tube portion 3A.

  Further, electronic means such as a microcomputer is mounted on the wiring board 4 to form a control means 8, and the magnetic detection element 6 and a plurality of terminals 7 are connected to the control means 8 through a wiring pattern. .

  Further, 9 is a substantially box-shaped case made of an insulating resin. The case 9 covers the opening on the lower surface of the cover 3, and the rotating body 1, the detection body 2, the wiring board 4, etc. are stored in the case 9 and the cover 3. Thus, a rotation angle detection device is configured.

  In order to manufacture the rotation angle detection device as described above, first, as shown in the cross-sectional view of FIG. 7A, the intermediate portion is inserted into the cover 3 on which the rotation body 1 and the detection body 2 are mounted. The lower ends of the molded terminals 7 protruding from the bottom surface of the cover 3 are inserted into the plurality of through holes 4A of the wiring board 4 having the magnetic detection elements 6 and the control means 8 mounted on the upper surface, and then soldered. Thus, the lower end of the terminal 7 is fixedly connected to the wiring board 4.

  After that, as shown in FIG. 7B, the opening on the lower surface of the cover 3 is covered with the case 9, and the cover 3 and the case 9 are fixed by screwing, welding (not shown) or the like to rotate. The angle detection device is completed.

  Then, the rotation angle detection device configured as described above is configured such that the control means 8 is connected to the plurality of terminals 7 extended in the rectangular tube portion 3A of the cover 3, connectors, lead wires (not shown), and the like. The steering shaft is inserted into the engaging portion 1A of the rotating body 1 and is attached to the automobile while being connected to an electronic circuit (not shown) of the vehicle.

  In the above configuration, when the steering is rotated, the rotating body 1 rotates, and the detecting body 2 rotates in conjunction with the rotation. Therefore, the magnet 5 mounted at the center also rotates, and the magnet 5 changes. The magnetic detection element 6 detects the magnetic force, and a sine wave, cosine wave, or a substantially sawtooth detection signal that repeatedly increases and decreases is input to the control means 8.

  And from the detection signal from this detection body 2 and the number of teeth of the spur gear of the rotation body 1 or the detection body 2, the control means 8 performs a predetermined calculation to detect the rotation angle of the rotation body 1, that is, the steering wheel, This is output to an electronic circuit of the vehicle, and various control of the vehicle, such as a power steering device and a brake device, is performed.

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

JP 2010-71661 A

  However, in the conventional rotation angle detection device, since the plurality of terminals 7 are fixed in the left side wall of the cover 3 by insert molding, the mold for molding the cover 3 becomes complicated and expensive, Since the lower end of the terminal 7 is fixedly connected to the wiring board 4 by soldering, there is a problem that it takes time to assemble.

  The present invention solves such a conventional problem, and an object thereof is to provide a rotation angle detection device that can be manufactured at a low cost and can reliably detect a rotation angle with a simple configuration.

  In order to achieve the above-mentioned object, the present invention is configured such that one end of a substantially L-shaped terminal is press-fitted and held in a through hole of a wiring board, and an intermediate portion of the terminal is press-fitted and held in a notch on the upper side wall of the case. An angle detection device is configured, and one end of the terminal is press-fitted and held in the through hole of the wiring board, and the intermediate part is press-fitted in the notch of the case, so that the mold for molding the case is simple and inexpensive. In addition, there is an effect that it is possible to obtain a rotation angle detection device that can be easily assembled without the need for soldering or the like, and that can reliably detect the rotation angle with a simple configuration.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a rotation angle detection device capable of reliably detecting a rotation angle with a simple configuration.

Sectional drawing of the rotation angle detection apparatus by one embodiment of this invention Exploded perspective view Partial perspective view Partial perspective view Partial perspective view Sectional view of a conventional rotation angle detector Cross section

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

(Embodiment)
FIG. 1 is a cross-sectional view of a rotation angle detection device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and in FIG. A spur gear is formed on the outer periphery, and an engaging portion 11A that engages a steering shaft (not shown) to be inserted is provided in the center portion.

  And 12 is a first detector made of insulating resin or metal, 13 is also a second detector, and the spur gear on the outer periphery of the first detector 12 is meshed with the spur gear of the rotating body 11, The spur gear on the outer periphery of the second detection body 13 is meshed with the spur gear of the first detection body 12, and these are rotatably mounted on the lower surface of the insulating resin cover 14.

  These diameter dimensions and the number of gear teeth are the largest in the rotating body 11 and are decreasing in the order of the first detecting body 12 and the second detecting body 13, for example, the teeth of the spur gear of the rotating body 11 The number is 48, the number of teeth of the spur gear of the first detector 12 is 32, and the number of teeth of the spur gear of the second detector 13 is 28.

  Reference numeral 15 denotes a wiring board disposed substantially in parallel below the first detection body 12 and the second detection body 13, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. An AMR (anisotropic magnetoresistive) element or the like is provided on the upper surface of the wiring board 15 below the magnet 16 mounted on the center lower surface of one detection body 12 and the magnet 17 mounted on the center lower surface of the second detection body 13. Magnetic detecting elements 18 and 19 are mounted and mounted so as to face the magnets 16 and 17.

  Further, 20 is a terminal made of a conductive metal such as a copper alloy or the like in a substantially L shape, and as shown in the partial perspective view of FIG. 3, a substantially ring-shaped locking portion with a middle portion slightly bulging in the left-right direction at the lower end. 20A is provided, a pair of protrusions 20B projecting in the left-right direction are formed in the middle part, and a plurality of convex parts 20C are formed on both left and right side surfaces, and the lower-end locking part 20A is slightly bent, The plurality of terminals 20 are connected to the wiring pattern by being press-fitted and held in the through holes 15A of the substrate 15.

  Further, electronic parts such as a microcomputer are mounted on the wiring board 15 to form a control means 21, and the control means 21 is connected to the magnetic detection elements 18 and 19 and a plurality of terminals 20 through a wiring pattern. ing.

  Reference numeral 22 denotes a substantially box-shaped case made of an insulating resin. The case 22 covers the opening on the lower surface of the cover 14, and the rotating body 11, the first detection body 12, the second detection body 13, and the wiring board 15. Are accommodated in the case 22 and the cover 14.

  Further, the protruding portion 20B of the intermediate portion of the terminal 20 abuts on the left inner wall of the case 22, and a plurality of convex portions 20C are press-fitted and held in the plurality of notches 22A on the upper surface of the left side wall of the case 22, The bottom surface of the left side wall of the cover 14 abuts, and the plurality of terminals 20 are held by the case 22.

  In addition, a rectangular tube portion 22B is formed outside the left side wall of the case 22, and the left ends of the plurality of terminals 20 protruding from the left side wall of the case 22 extend into the rectangular tube portion 22B to detect the rotation angle. The device is configured.

  In order to manufacture the rotation angle detection device as described above, first, as shown in the partial perspective view of FIG. 4A, the magnetic detection elements 18 and 19 and the control means 21 are mounted on the upper surface. A substantially ring-shaped locking portion 20A at the lower end of the terminal 20 is inserted into the plurality of through holes 15A of the substrate 15 while being bent, and the lower ends of the plurality of terminals 20 are press-fitted and held in the through holes 15A.

  Then, as shown in FIG. 4B, the protrusion 20B at the intermediate portion of the terminal 20 is brought into contact with the left inner wall of the case 22, and the plurality of convex portions 20C are press-fitted into the plurality of notches 22A. However, the wiring board 15 is housed in the case 22, and a plurality of terminals 20 whose left ends extend to the rectangular tube portion 22 </ b> B are press-fitted and held in the case 22.

  Further, thereafter, as shown in the partial perspective view of FIG. 5, the first detection body 12, the second detection body 13, and the rotation body 11 having the magnets 16 and 17 mounted on the lower surface at the center are stored in the case 22. Then, the opening on the upper surface of the case 22 is covered with the cover 14, the lower surface of the left side wall of the cover 14 is brought into contact with the upper surfaces of the plurality of terminals 20, and the case 22 and the cover 14 are tightened or welded (not shown). After fixing, the rotation angle detection device is completed.

  That is, since the locking portion 20A is press-fitted into the through-hole 15A and the lower ends of the plurality of terminals 20 are press-fitted and held in the wiring board 15, it is not necessary to perform soldering or the like, and the assembly can be easily performed and the intermediate The protrusion portion 20B of the portion is brought into contact with the left inner wall of the case 22, the plurality of convex portions 20C are press-fitted into the plurality of cutout portions 22A, and the plurality of terminals 20 are press-fitted and held in the case 22. The mold for molding 22 can be formed into a simple and inexpensive one rather than a complicated one such as insert molding.

  And the rotation angle detection apparatus comprised in this way is the control means 21 via the some terminal 20 extended in the square cylinder part 22B of the cover 14, a connector, a lead wire (not shown), etc. The steering shaft is inserted into the engaging portion 11A of the rotating body 11 and is attached to the automobile while being connected to an electronic circuit (not shown) of the vehicle.

  In the above configuration, when the steering is rotated, the rotating body 11 rotates, and the first detecting body 12 rotates in conjunction with the rotating body 11 and the second detecting body 13 rotates in conjunction with the first detecting body 12. Therefore, the magnets 16 and 17 mounted in the center also rotate, and the magnetic detection elements 18 and 19 detect the changing magnetic force of the magnets 16 and 17, and the sine wave, cosine wave, or approximately A sawtooth detection signal is input to the control means 21.

  At this time, since the spur gears of the first detection body 12 and the second detection body 13 have different numbers of teeth, the data waveforms output from the magnetic detection elements 18 and 19 have different shapes and phase differences. It becomes a certain detection signal.

  And from the two different detection signals from the first detection body 12 and the second detection body 13, and the number of teeth of the spur gear of the rotating body 11, the first detection body 12, and the second detection body 13, The control means 21 performs a predetermined calculation to detect the rotating body 11, that is, the rotation angle of the steering, and outputs it to the vehicle's electronic circuit to perform various controls of the vehicle such as a power steering device and a brake device. Is called.

  In the present invention, the locking portions 20A at the lower ends of the plurality of terminals 20 are press-fitted and held in the through holes 15A of the wiring board 15, and the protruding portion 20B of the intermediate portion of the terminals 20 is abutted against the left inner wall of the case 22. By touching and holding the plurality of convex portions 20C in the plurality of cutout portions 22A, the mold for molding the case 22 can be made simple and inexpensive, and can be easily assembled without the need for soldering or the like. Can be done.

  That is, the locking portion 20A is press-fitted into the through-hole 15A, and the lower ends of the plurality of terminals 20 are press-fitted and held in the wiring board 15, so that it is not necessary to perform soldering or the like, and the intermediate portion can be easily assembled. The projecting portion 20B is brought into contact with the left inner wall of the case 22, the plurality of convex portions 20C are press-fitted into the plurality of cutout portions 22A, and the plurality of terminals 20 are press-fitted and held in the case 22, whereby the case 22 is The mold to be molded is not complicated such as insert molding, but can be formed into a simple and inexpensive one.

  In the above description, the spur gear of the first detector 12 is engaged with the spur gear of the rotating body 11, and the spur gear of the second detector 13 is engaged with the spur gear of the first detector 12. The structure of the spur gear of the rotating body 11 is engaged with the spur gears of both the first detection body 12 and the second detection body 13, or only one detection body. Even when the spur gear is engaged with the spur gear of the rotating body 11, the present invention can be implemented.

  In the above description, the configuration in which the control means 21 detects the rotation angle of the steering wheel based on the detection signals from the magnetic detection elements 18 and 19 has been described. However, the control means 21 is omitted and the control means 21 increases or decreases from the magnetic detection elements 18 and 19. A sine wave, cosine wave, or substantially sawtooth detection signal that repeats the above may be directly output to the vehicle electronic circuit.

  As described above, according to the present embodiment, one end of the substantially L-shaped terminal 20 is press-fitted and held in the through hole 15A of the wiring board 15, and the intermediate portion of the terminal 20 is the notch portion 22A on the upper surface of the side wall of the case 22. Since the one end of the terminal 20 is press-fitted and held in the through hole 15A of the wiring board 15 and the plurality of intermediate protrusions 20C are press-fitted and held in the notch 22A of the case 22, the case 22 is It is possible to obtain a rotation angle detection device that can make a molding die simple and inexpensive, can be easily assembled without the need for soldering, and can detect a reliable rotation angle with a simple configuration. It can be done.

  The rotation angle detection device according to the present invention has an advantageous effect that a device capable of reliably detecting the rotation angle can be obtained with a simple configuration, and is mainly useful for detecting the rotation angle of an automobile steering or the like. It is.

DESCRIPTION OF SYMBOLS 11 Rotating body 11A Engagement part 12 1st detection body 13 2nd detection body 14 Cover 15 Wiring board 15A Through-hole 16, 17 Magnet 18, 19 Magnetic detection element 20 Terminal 20A Locking part 20B Protrusion part 20C Protrusion part 21 Control means 22 Case 22A Notch 22B Square tube

Claims (1)

A rotating body that rotates in conjunction with the steering, a detecting body that rotates in conjunction with the rotating body, a magnet mounted in the center of the detecting body, a magnetic detecting element disposed opposite to the magnet, and the magnetic A wiring board having a detection element mounted on the upper surface, a substantially L-shaped terminal having one end connected to the wiring board, and a substantially box-shaped case in which the other end of the terminal extends outward from the side wall, A rotation angle detection device in which one end of the terminal is press-fitted and held in the through hole of the wiring board, and an intermediate part of the terminal is press-fitted and held in a notch on the upper surface of the side wall of the case.

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