JP2007192609A - Rotation angle detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation angle detector used mainly for detecting a rotation angle of a steering of an automobile or the like, having no error, capable of detecting the rotation angle highly accurately. <P>SOLUTION: A biasing means for pressing the first detection body 3 onto a rotator 1 is provided, and a stopper means for locking the biasing means is formed between the biasing means and a case 12, and thereby the outer circumference of a slide-contact part 1C of the rotator 1 is brought into elastic contact with the inner circumference of a through hole 12A of the case 12 by the biasing means. Consequently, since eccentricity of the rotator 1 caused by a gap between them can be prevented, and a biasing force of the biasing means can be kept constant by the stopper means, and abrasion between the slide-contact part 1C and the through hole 12A can be reduced, this rotation angle detector having no error, capable of preventing the eccentricity of the rotator 1, and detecting the rotation angle highly accurately can be acquired. <P>COPYRIGHT: (C)2007,JPO&INPIT

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, as the functions of automobiles have advanced, the number of steering angle detection devices using various rotation angle detection devices for various controls has increased.

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

  FIG. 4 is a plan view of a conventional rotation angle detecting device. In FIG. 4, reference numeral 1 denotes a rotating body having a spur gear portion 1A formed on the outer periphery, and a shaft of a steering (not shown) inserted through the center portion. An engaging portion 1B to be engaged is provided, and a substantially cylindrical sliding contact portion 1C is formed on the lower surface.

  Reference numeral 2 denotes a substantially box-shaped case made of an insulating resin. A bottom surface is formed with a through hole 2A that is slightly larger than the sliding contact portion 1C of the rotating body 1 and protrudes upward in a cylindrical shape. The slidable contact portion 1 </ b> C is inserted, and the rotating body 1 is rotatably attached to the case 2.

  Reference numeral 3 denotes a first detector that is rotatably mounted on the bottom surface of the case 2, and the outer spur gear portion 3 </ b> A meshes with the spur gear portion 1 </ b> A of the rotor 1, and the first detector 3. In the center, a magnet 4 is mounted by insert molding or the like.

  Further, 5 is a second detector rotatably mounted on the bottom surface of the case 2, and a spur gear portion 5A having a different number of teeth from the spur gear portion 3A of the first detector 3 is provided on the outer periphery. The spur gear portion 5A meshes with the spur gear portion 3A, and a magnet 6 is attached to the center of the second detection body 5.

  Reference numeral 7 denotes a wiring board disposed substantially in parallel above the first detection body 3 and the second detection body 5. A plurality of wiring patterns (not shown) are formed on both surfaces, and the first Magnetic detection elements (not shown) are respectively mounted on the surfaces of the detection body 3 facing the magnet 4 and the second detection body 5 facing the magnet 6.

  In addition, the detection means is formed by the magnets 4 and 6 and the magnetic detection elements opposed to the magnets 4 and 6 as described above, and the control means 10 connected to the magnetic detection elements on the wiring board 7 by electronic components such as a microcomputer. Is formed to constitute a rotation angle detection device.

  In such a rotation angle detection device, the control means 10 is connected to an electronic circuit (not shown) of the automobile body through a connector (not shown) or the like, and the engaging portion 1B of the rotating body 1 has a steering wheel. The shaft is inserted and attached to the automobile.

  In the above configuration, when the steering wheel is rotated during driving, the rotating body 1 rotates, and the first and second detection bodies 3 and 5 rotate in conjunction with the rotation. 6 also rotates, the magnetism detecting element detects the magnetic force that changes between the magnets 4 and 6, and these detection signals are output to the control means 10.

  At this time, since the first and second detection bodies 3 and 5 have different numbers of teeth of the spur gear portions 3A and 5A and different rotation speeds, detection signals from the respective detection means have different periods and phases. It becomes a detection signal.

  Then, from such two different detection signals and the respective number of teeth, the control means 10 performs a predetermined calculation to detect the rotation angle of the rotating body 1, that is, the steering, which is output to the electronic circuit of the automobile body. In this configuration, various controls are performed.

  However, in such a rotation angle detecting device, the sliding contact portion 1C of the rotating body 1 is inserted into the through-hole 2A having a slightly larger diameter so that the rotating body 1 is rotatably attached to the case 2. Therefore, the gap between the sliding contact portion 1C and the through hole 2A may cause eccentricity in the rotation of the rotating body 1 and cause an error in detection of the rotation angle.

  For this reason, the rotating body 1 is pressed and urged against the through hole 2A of the case 2 using a spring or the like, and the outer periphery of the sliding contact portion 1C is elastically contacted with the inner periphery of the through hole 2A, thereby eliminating the gap therebetween. However, when the urging force of the spring or the like is increased, the outer periphery of the sliding contact portion 1C or the inner periphery of the through hole 2A is caused by this force, and the eccentricity of the rotating body 1 may be increased.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2005-3625 A

  However, in the conventional rotation angle detecting device, the sliding contact portion 1C is inserted into the through-hole 2A having a large diameter, and the rotating body 1 is rotatably mounted on the case 2. Therefore, the sliding contact portion 1C And the through hole 2A cause eccentricity in the rotation of the rotating body 1 and an error in the rotation occurs. To prevent this, the sliding contact portion 1C and the through hole 2A are elastically contacted using a spring or the like. If it does, since wear will arise and the eccentricity of the rotary body 1 will become large, the subject that the detection of a rotation angle with high precision was difficult occurred.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a rotation angle detection device capable of detecting a rotation angle with high accuracy with a simple configuration.

  In order to achieve the above object, the present invention provides an urging means that presses one of the rotating body or the detecting body that rotates in conjunction with the rotating body to the other, and an urging force is provided between the urging means and the case. The rotation angle detecting device is configured by forming stopper means for locking the means, and the outer periphery of the sliding contact portion of the rotating body is elastically contacted with the inner periphery of the through hole of the case by the biasing means, and the rotating body is formed by a gap therebetween The eccentric force of the urging means can be kept constant by the stopper means, and the wear of the sliding contact part and the through-hole can be reduced. It is possible to obtain a rotation angle detection device capable of detecting the above.

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

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

  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 plan view 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 made of insulating resin or metal having a spur gear portion 1A formed on the outer periphery. An engaging portion 1B that engages with a shaft of a steering (not shown) that is inserted is provided in the center portion, and a substantially cylindrical sliding contact portion 1C is formed on the lower surface.

  A substantially box-shaped case made of an insulating resin 12 has a through hole 12A which is slightly larger than the sliding contact portion 1C of the rotating body 1 and protrudes upward in a cylindrical shape on the bottom surface. The slidable contact portion 1 </ b> C is inserted, and the rotating body 1 is rotatably attached to the case 12.

  Reference numeral 3 denotes a first detection member made of an insulating resin or metal that is rotatably mounted on the bottom surface of the case 12. The spur gear portion 3 A on the outer periphery meshes with the spur gear portion 1 A of the rotating body 1. In the center of one detection body 3, a magnet 4 is mounted by insert molding or the like.

  Further, 5 is a second detector rotatably mounted on the bottom surface of the case 12, and a spur gear portion 5A having a different number of teeth from the spur gear portion 3A of the first detector 3 is provided on the outer periphery. The spur gear portion 5A meshes with the spur gear portion 3A, and a magnet 6 is attached to the center of the second detection body 5.

  Reference numeral 7 denotes a wiring board disposed substantially in parallel above the first detection body 3 and the second detection body 5. A plurality of wiring patterns (not shown) are formed on both surfaces, and the first A magnetic detection element 8 is mounted on the surface of the detection body 3 facing the magnet 4, and a magnetic detection element 9 is mounted on the surface of the second detection body 5 facing the magnet 6.

  The magnet 4 and the magnetic detection element 8 opposed to the magnet 4 and the magnet 6 and the magnetic detection element 9 opposed to the magnet 4 form detection means, respectively, and the wiring board 7 has an electronic component such as a microcomputer. Thus, the control means 10 connected to the magnetic detection devices 8 and 9 is formed.

  Further, 15 is a spring made of steel or copper alloy as a biasing means, and one end is held on the bottom surface of the case 12 in a slightly bent state, and a pressing portion 15A made of an insulating resin is provided in the middle portion of the other end. The pressing portion 15 </ b> A is elastically contacted with the first detection body 3 to press the first detection body 3 toward the rotating body 1.

  Then, as shown in FIG. 1, the rotating body 1 is urged upward by the urging force of the spring 15 via the first detection body 3, and the sliding contact portion 1 </ b> C on the opposite side to the first detection body 3. The upper outer periphery is in elastic contact with the inner periphery of the through hole 12 </ b> A of the case 12.

  Further, the case 12 is provided with a locking portion 12B protruding upward, and a stopper means for locking the urging force of the spring 15 is formed by the contact portion 15B of the tip of the spring 15 elastically contacting the locking portion 12B. By this stopper means, the urging force of the spring 15 is formed to be a constant force, and the rotation angle detecting device is configured.

  In such a rotation angle detection device, the control means 10 is connected to an electronic circuit (not shown) of the automobile body through a connector (not shown) or the like, and the engaging portion 1B of the rotating body 1 has a steering wheel. The shaft is inserted and attached to the automobile.

  In the above configuration, when the steering is rotated during operation, the rotating body 1 engaged with the steering rotates, and the first detection body 3 and the spur gear section in which the spur gear section 3A meshes with the outer spur gear section 1A. The second detection body 5 in which the spur gear portion 5A meshes with 3A rotates in conjunction with it.

  Then, the magnets 4 and 6 mounted in the center of the first and second detectors 3 and 5 also rotate, and the magnetic force of the magnets 4 and 6 is changed so that the magnetic detection elements 8 and 9 generate a sine wave or cosine wave. A detection signal having a sawtooth waveform which is detected as a detection signal having a voltage waveform and gradually increases and decreases is output to the control means 10.

  At this time, since the first and second detection bodies 3 and 5 have different numbers of teeth of the spur gear portions 3A and 5A and different rotation speeds, the detection signals from the first and second detection means are periodic. And detection signals with different phases.

  Then, the control means 10 performs a predetermined calculation from the two different detection signals and the number of teeth of each of the rotating body 1 and the first and second detecting bodies 3 and 5, and the rotating body 1, that is, the steering The rotation angle is detected and output to the electronic circuit of the automobile body, and various controls of the vehicle are performed.

  At this time, the rotating body 1 pressed against the first detection body 3 by the spring 15 is urged in the opposite direction to the first detection body 3, and the sliding contact portion on the opposite side to the first detection body 3. Since the outer periphery of 1C always rotates in contact with the inner periphery of the through hole 12A of the case 12, the rotating body 1 does not rattle and rotates without being eccentric regardless of the size of the gap between the sliding contact portion 1C and the through hole 12A. The rotation is accurately transmitted from the spur gear portion 1A to the spur gear portion 3A.

  Further, the contact portion 15B at the tip of the spring 15 is elastically contacted with the locking portion 12B of the case 12, and the biasing force of the spring 15 is regulated by the stopper means, and the rotating body 1 is always biased with a constant force, and the sliding member 1 is slid. Since the outer periphery of the contact portion 1C is in elastic contact with the inner periphery of the through-hole 12A, wear of the sliding contact portion 1C and the through-hole 12A due to rotation is reduced, the eccentricity of the rotating body 1 is prevented, there is no error, and a highly accurate rotation angle Can be detected.

  As described above, according to the present embodiment, the biasing means for pressing the first detection body 3 against the rotating body 1 is provided, and the stopper for locking the biasing means between the biasing means and the case 12. By forming the means, the outer periphery of the sliding contact portion 1C of the rotating body 1 is elastically contacted with the inner periphery of the through hole 12A of the case 12 by the biasing means, and the eccentricity of the rotating body 1 due to the gap therebetween can be prevented, and the stopper means Since the urging force of the urging means is kept constant and wear of the sliding contact portion 1C and the through hole 12A can be reduced, the rotation of the rotating body 1 can be prevented, and there is no error, and the rotation angle can be detected with high accuracy. An angle detection device can be obtained.

  In the above description, the configuration in which the first detection body 3 is pressed against the rotating body 1 by the spring 15 has been described. Conversely, as shown in the plan view of FIG. The rotating body 1 is pressed and urged to the first detecting body 3 by the pressing portion 16A, the lower outer periphery of the sliding contact portion 1C is elastically contacted with the inner periphery of the through hole 12A of the case 12, and the locking portion 12C of the case 12 is It is possible to implement the present invention even when the stopper 16 is formed by elastically contacting the contact portion 16B at the tip of the spring 16 and the urging force of the spring 16 is locked so that the urging force becomes a constant force. It is.

  In the above description, the spur gear portions are provided on the outer circumferences of the rotating body 1 and the first and second detection bodies 3 and 5, respectively. In addition to such a spur gear, an uneven portion capable of transmitting rotation to the outer periphery of the rotating body or the detecting body or a high friction portion such as rubber may be formed so as to rotate in conjunction with each other.

  The rotation angle detection device according to the present invention has no error and can detect a rotation angle with high accuracy, and is mainly useful for detecting the rotation angle of a steering wheel of an automobile.

The top view of the rotation angle detection apparatus by one embodiment of this invention Exploded perspective view Plan view according to another embodiment Plan view of a conventional rotation angle detector

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating body 1A Spur gear part 1B Engagement part 1C Sliding contact part 3 1st detection body 3A Spur gear part 4,6 Magnet 5 2nd detection body 5A Spur gear part 7 Wiring board 8, 9 Magnetic detection element 10 Control Means 12 Case 12A Through-hole 12B, 12C Locking portion 15, 16 Spring 15A, 16A Pressing portion 15B, 16B Abutting portion

Claims (1)

A substantially cylindrical sliding contact portion is formed on the lower surface, and a rotating body that rotates in conjunction with the steering, a case in which the sliding contact portion is inserted into the through-hole and the rotating body is rotatably mounted, and the rotation A detection body that rotates in conjunction with the body, a detection means that detects the rotation of the detection body as a detection signal, and a control means that detects a rotation angle of the rotation body based on a detection signal from the detection means. A rotation angle detecting device provided with biasing means for pressing one of the body and the detection body against the other, and having stopper means for locking the biasing means between the biasing means and the case.

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