JP2010112848A - Rotation angle detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily-assembleable device having a simple constitution, capable of detecting surely a rotation angle, concerning a rotation angle detection device mainly used for rotation angle detection of a vehicle steering, or the like. <P>SOLUTION: A spur gear 21B as a connection means to a motor 15 is formed on a rotator 21 rotating sequentially with the steering. Hereby, since the connection means for connecting the motor 15 is formed integrally with the rotator 21, and a force of the motor 15 can be transferred to a steering shaft without using a different member, this easily-assembleable rotation angle detection device having the simple constitution, capable of detecting surely the rotation angle can be acquired. <P>COPYRIGHT: (C)2010,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 detected by various rotation angle detection devices and various controls for the vehicle's power steering device, brake device, etc. using this is increasing.

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

  FIG. 5 is a perspective view of a conventional rotation angle detection device. In FIG. 5, reference numeral 1 denotes a rotating body, a spur gear portion 1A is formed on the outer periphery of the side surface, and a through hole is provided in the center portion. .

  2 is a first detector having a spur gear portion 2A formed on the outer periphery of the side surface, and 3 is a second detector 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 and the spur gear portion 3A of the second detection body 3 are engaged with the spur gear portion 1A of the rotating body 1, respectively.

  Reference numeral 4 denotes a wiring board disposed substantially in parallel above 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, and the first detection is performed. Magnetic detection elements 5B and 6B are mounted on the opposing surfaces of the magnet 5A mounted at the center of the body 2 and the magnet 6A mounted at the center of the second detection body 3, respectively.

  The first detection means 5 is formed by the magnet 5A and the magnetic detection element 5B opposed to each other, and the second detection means 6 is formed by the magnet 6A and the magnetic detection element 6B. The control means 7 connected to the magnetic detection elements 5B and 6B is formed by electronic components such as a microcomputer.

  Further, the rotating body 1, the first detecting body 2, the second detecting body 3, the wiring board 4 and the like are covered with an insulating resin case, a cover (not shown), etc. It is configured.

  FIG. 6 is a perspective view of a power steering device using such a rotation angle detection device 10, in which 11 is a steering wheel, 12 is a steering shaft, and the steering wheel 11 is fixed to the upper end of the steering shaft 12. In addition, a rotation angle detection device 10 in which a steering shaft 12 is inserted into and fixed to the central portion of the rotating body 1 is mounted below this.

  Further, 13 is a rotating body having a spur gear portion 13A formed on the outer periphery of the side surface, 14 is a driving body having a worm gear portion 14A formed on the outer periphery, 15 is a motor, and the central portion of the rotating body 13 is below the steering shaft 12. In addition to being fixed, the worm gear portion 14A of the driving body 14 fixed to the rotation shaft of the motor 15 meshes with the spur gear portion 13A, and the rotating body 13 is connected to the motor 15 to constitute a power steering device.

  In such a power steering device, the control means 7 and the motor 15 of the rotation angle detection device 10 are connected to an electronic circuit (not shown) of the automobile via a connector, a lead wire (not shown) or the like. At the same time, the steering wheel 11 is disposed in front of the driver's seat and attached to the automobile.

  In the above configuration, when the steering wheel 11 is rotated, the rotating body 1 fixed to the steering shaft 12 is rotated, and the first detection body 2 and the second detection body 3 are rotated in conjunction with this, The magnets 5A and 6A mounted in the center also rotate, and the magnetic detecting elements 5B and 6B detect the changing magnetic force of the magnets 5A and 6A. A detection signal is input to the control means 7.

  At this time, since the first detector 2 and the second detector 3 have different numbers of teeth and different rotation speeds, the data waveforms from the magnetic detection elements 5B and 6B have different shapes and detection signals having a phase difference. It becomes.

  Then, the control means 7 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 shaft 12. The direction and rotation angle are detected and output to the electronic circuit of the car body. The electronic circuit calculates various data from the steering wheel rotation angle and torque, or speed sensors attached to various parts of the car body. Various controls of the vehicle such as a power steering device and a brake device are performed.

  That is, for example, when the vehicle is running, the motor 15 is stopped and the power steering device is not used, and the steering wheel 11 is operated with a somewhat heavy force, and when the vehicle is stopped. The motor 15 is started in accordance with the rotation direction of the steering shaft 12, and the rotating body 13, that is, the steering shaft 12 is rotated by the driving body 14, so that the steering wheel 11 can be operated at a large rotation angle even with a light force. It was what has been.

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 above conventional rotation angle detection device, in addition to fixing the central portion of the rotating body 1 of the rotation angle detection device 10 to the steering shaft 12 below the steering wheel 11 when the vehicle is assembled, further below this Since the rotating body 13 connected to the motor 15 via the drive body 14 needs to be fixed, there are problems that the number of components increases and the assembly is troublesome.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a rotation angle detection device that can be easily assembled even with a simple configuration and can reliably detect the rotation angle.

  In order to achieve the above object, the present invention comprises a rotating body that rotates in conjunction with steering to form a connecting means with a motor to constitute a rotation angle detecting device. The unit is formed in one piece, so that the power of the motor can be transmitted to the steering shaft without using another part, so the number of components is reduced, it is easy to assemble with a simple configuration, and the rotation angle can be detected reliably. It is possible to obtain a simple rotation angle detection device.

  As described above, according to the present invention, it is possible to realize a rotation angle detection device that can be easily assembled even with a simple configuration and can detect the rotation angle reliably.

  Hereinafter, embodiments 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 1)
The first aspect of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a perspective view of a rotation angle detection device according to a first embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a rotating body made of insulating resin or metal. A spur gear portion 21B as a connecting means having a slightly larger outer shape is formed on the lower side, and a through hole is provided in the center portion.

  Reference numeral 22 denotes a first detection body made of insulating resin or metal, and 23 denotes a second detection body. The spur gear portion 22A on the outer periphery of the first detection body 22 meshes with the spur gear portion 21A of the rotating body 21. In addition, a spur gear portion 23A having a different number of teeth from the spur gear portion 22A on the outer periphery of the second detection body 23 is meshed with the spur gear portion 22A of the first detection body 22.

  In addition, the diameter and the number of teeth of these gears are the largest in the rotating body 21 and are decreasing in the order of the first detecting body 22 and the second detecting body 23. For example, the number of teeth of the rotating body 21 is 48, The number of teeth of the first detection body 22 is 32, and the number of teeth of the second detection body 23 is 28.

  Reference numeral 24 denotes a wiring board disposed substantially in parallel above the first and second detection bodies 22 and 23. A plurality of wiring patterns (not shown) are formed on the upper and lower surfaces, and the first detection is performed. Magnetic detection of an AMR (anisotropic magnetoresistive) element or the like is provided on the opposing surface of the magnet 5A attached to the center of the body 22 by insert molding or the like and the magnet 6A attached to the center of the second detection body 23. Elements 5B and 6B are respectively mounted.

  The first detection means 5 is formed by the magnet 5A and the magnetic detection element 5B opposed to each other, and the second detection means 6 is formed by the magnet 6A and the magnetic detection element 6B. The control means 27 connected to the magnetic detection elements 5B and 6B is formed by electronic components such as a microcomputer.

  Further, the rotating body 21, the first detecting body 22, the second detecting body 23, the wiring board 24, etc. are covered with an insulating resin case, a cover (not shown), etc. It is configured.

  FIG. 2 is a perspective view of a power steering device using such a rotation angle detection device 30. In FIG. 2, 11 is a steering wheel, 12 is a steering shaft, and the steering wheel 11 is fixed to the upper end of the steering shaft 12. In addition, a rotation angle detection device 30 in which the steering shaft 12 is inserted into and fixed to the central portion of the rotating body 21 is mounted below this.

  Further, 14 is a drive body having a worm gear portion 14A formed on the outer periphery, 15 is a motor, and the worm gear portion 14A of the drive body 14 fixed to the rotating shaft of the motor 15 meshes with the spur gear portion 21B. 21 is connected to the motor 15 by a spur gear portion 21B as the connecting means to constitute a power steering device.

  In such a power steering device, the control means 27 and the motor 15 of the rotation angle detection device 30 are connected to an electronic circuit (not shown) of an automobile via a connector, a lead wire (not shown) or the like. At the same time, the steering wheel 11 is disposed in front of the driver's seat and attached to the automobile.

  In the above configuration, when the steering wheel 11 is rotated, the rotating body 21 fixed to the steering shaft 12 is rotated, and the first detecting body 22 and the second detecting body 23 are rotated in conjunction with this, The magnets 5A and 6A mounted in the center also rotate, and the magnetic detecting elements 5B and 6B detect the changing magnetic force of the magnets 5A and 6A. A detection signal is input to the control means 27.

  At this time, since the first detection body 22 and the second detection body 23 have different numbers of teeth and different rotation speeds, the data waveforms from the magnetic detection elements 5B and 6B have different shapes and phase difference detection signals. It becomes.

  Then, the control means 27 performs a predetermined calculation on the basis of the two different detection signals from the first detection body 22 and the second detection body 23 and the number of teeth, and the rotation of the rotating body 21, that is, the steering shaft 12. The direction and rotation angle are detected and output to the electronic circuit of the car body. The electronic circuit calculates various data from the steering wheel rotation angle and torque, or speed sensors attached to various parts of the car body. Various controls of the vehicle such as a power steering device and a brake device are performed.

  That is, for example, when the vehicle is running, the motor 15 is stopped and the power steering device is not used, and the steering wheel 11 is operated with a somewhat heavy force, and when the vehicle is stopped. The motor 15 is started in accordance with the rotation direction of the steering shaft 12, and the driving body 14 rotates the rotating body 21, that is, the steering shaft 12 via the spur gear portion 21B. It is comprised so that operation of can be performed.

  As a connecting means, the force of the motor 15 for rotating the steering wheel 11 with such a light force is formed on the rotating body 21 of the rotation angle detection device 30 from the worm gear portion 14A of the driving body 14. Since the power steering device is formed to be transmitted by the spur gear portion 21B, the rotation angle can be reliably detected with a simple configuration.

  That is, by forming a spur gear portion 21B as a connecting means with the motor 15 on the rotating body 21 whose central portion is fixed to the steering shaft 12, another component such as a rotating body is used below the steering shaft 12. Therefore, since the force of the motor 15 can be transmitted to the steering shaft 12, the number of components is reduced, and the motor 15 can be easily assembled even with a simple configuration.

  Thus, according to the present embodiment, by forming the spur gear portion 21B as a connecting means with the motor 15 in addition to the spur gear portion 21A on the rotating body 21 that rotates in conjunction with the steering, Since the connecting means for connecting the motor 15 is formed integrally with the rotating body 21 and the force of the motor 15 can be transmitted to the steering shaft 12 without using a separate part, it is easy to assemble with a simple configuration and the rotation angle is reliable. A rotation angle detection device capable of detection can be obtained.

(Embodiment 2)
A second embodiment of the present invention will be described using the second embodiment.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure of Embodiment 1, and detailed description is abbreviate | omitted.

  FIG. 3 is a perspective view of a rotation angle detection device according to a second embodiment of the present invention, in which 31 is a rotating body made of insulating resin or metal, and a spur gear portion as a connecting means on the outer periphery of the side surface. 31B is provided, and on this upper surface, a spur gear portion 31A in which a gear is formed upward is provided in an overlapping manner.

  Reference numeral 22 denotes a first detection body made of insulating resin or metal, and 23 denotes a second detection body. The spur gear portion 22A on the outer periphery of the first detection body 22 meshes with the spur gear portion 31A of the rotating body 31. In addition, a spur gear portion 23A having a different number of teeth from the spur gear portion 22A on the outer periphery of the second detection body 23 is meshed with the spur gear portion 22A of the first detection body 22.

  In other words, in the present embodiment, the first detection body 22 and the second detection body 23 overlap each other above the rotating body 31, and the respective spur gear portions are engaged with each other. The wiring board 24 on which the wiring pattern (not shown) is formed is disposed substantially parallel to the sides of the first and second detection bodies 22 and 23.

  Note that an AMR (anisotropic magnetism) is formed on the facing surface of the magnet 5A attached to the center of the first detector 22 and the magnet 6A attached to the center of the second detector 23 of the wiring board 24. Magnetic detection elements 5B and 6B such as resistance elements are respectively mounted. The first detection means 5 is constituted by the opposed magnet 5A and the magnetic detection element 5B, and the second detection means 6 is similarly constituted by the magnet 6A and the magnetic detection element 6B. Are formed in the same manner as in the first embodiment.

  A control means 27 connected to the magnetic detection elements 5B and 6B is formed on the wiring board 24 by electronic components such as a microcomputer, and the rotating body 31, the first detection body 22, and the second detection body. 23, the wiring board 24, and the like are covered with an insulating resin case, a cover (not shown), and the like to constitute a rotation angle detection device 40.

  FIG. 4 is a perspective view of a power steering device using such a rotation angle detection device 40. In FIG. 4, the steering wheel 11 is fixed to the upper end of the steering shaft 12, and the steering shaft is disposed below the steering wheel 11. It is the same as in the case of the first embodiment that the rotation angle detection device 40 in which 12 is inserted and fixed in the center of the rotating body 31 is attached.

  Then, the worm gear portion 14A of the driving body 14 fixed to the rotating shaft of the motor 15 meshes with the spur gear portion 31B, and the rotating body 31 is connected to the motor 15 by the spur gear portion 31B as the connecting means and is powered. A steering device is configured.

  In the above configuration, when the steering wheel 11 is rotated, the rotating body 31 fixed to the steering shaft 12, and the first detecting body 22 and the second detecting body 23 are rotated in conjunction with the rotating body 31, and the magnet 5A, The magnetic detection elements 5B and 6B detect the magnetic force of 6A changing, and the control means 27 detects the rotation direction and rotation angle of the rotating body 31, that is, the steering shaft 12, from these different detection signals and the number of teeth. This is the same as in the first embodiment.

  Then, this is output to the electronic circuit of the automobile body, and the electronic circuit calculates this rotation angle, rotation torque, or various data from sensors of each part of the vehicle body, and various kinds of vehicles such as power steering devices and brake devices. When the vehicle is stopped, for example, the motor 15 is started in accordance with the rotation direction of the steering shaft 12, and the rotating body 31, that is, the steering shaft 12 is rotated by the driving body 14 via the spur gear portion 31B. And it is comprised so that operation of the big rotation angle of the steering wheel 11 may be performed even with a light force.

  Further, the force of the motor 15 for rotating the steering wheel 11 with such a light force is used as a connecting means formed on the rotating body 31 of the rotation angle detecting device 40 from the worm gear portion 14A of the driving body 14. By transmitting to the spur gear portion 31B, it is easy to assemble with a simple configuration without using another component such as a rotating body, and the rotation angle can be reliably detected.

  As described above, also in the present embodiment in which the first detection body 22 and the second detection body 23 are overlapped on the rotary body 31 and the spur gear portions are engaged with each other, the rotation that rotates in conjunction with the steering is performed. In addition to the spur gear portion 31 </ b> A, the spur gear portion 31 </ b> B as a connecting means with the motor 15 is formed on the body 31 so that the connecting means for connecting the motor 15 is formed integrally with the rotating body 31. Since the force of the motor 15 can be transmitted to the steering shaft 12 without using a motor, the number of components is reduced, and it is easy to assemble with a simple configuration, and a rotation angle detection device capable of reliably detecting the rotation angle can be obtained. It can be done.

  Furthermore, in the present embodiment, the first detection body 22 and the second detection body 23 are made to overlap with each other by overlapping the first detection body 22 and the second detection body 23 above the rotating body 31. Since it can be disposed along the steering shaft 12, it is possible to reduce the size in the outer circumferential direction, and the power steering device as a whole can be downsized.

  In addition, in the above description, the structure which formed the spur gear part 21B and 31B as a connection means in the rotary body 21 and 31 separately from the spur gear part 21A and 31A meshing with the 1st detection body 22 was demonstrated. However, the present invention can be implemented even if the spur gear portion 21A or 31A is engaged with the worm gear portion 14A of the drive body 14 and these are used as connecting means.

  In the above description, the configuration in which the first detection body 22 meshes with the rotating bodies 21 and 31 and the second detection body 23 meshes with the first detection body 22 has been described. As described in (1), the rotating body 21 or 31 is configured so that both the first detecting body 22 and the second detecting body 23 are engaged, or one detecting body instead of two rotating bodies 21 is used. The present invention can be implemented even with a configuration that meshes with the 31.

  Furthermore, although the spur gear part was formed in the outer periphery of the rotary bodies 21 and 31, the 1st detection body 22, and the 2nd detection body 23, respectively, these were meshed | engaged and the structure which rotates mutually interlock | cooperated was demonstrated. In addition to the gear part, a configuration using a gear of another shape such as a bevel gear, or instead of the gear, an uneven part or a high friction part that can transmit rotation is formed on the outer periphery of the rotating body or each detecting body, It is good also as a structure which rotates mutually interlockingly by this.

  The rotation angle detection device according to the present invention can be easily assembled even with a simple configuration, and can be reliably detected. The rotation angle detection device is mainly useful for detecting the rotation angle of an automobile steering.

The perspective view of the rotation angle detection apparatus by the 1st Embodiment of this invention Perspective view of the power steering device The perspective view of the rotation angle detection apparatus by the 2nd Embodiment of this invention Perspective view of the power steering device A perspective view of a conventional rotation angle detection device Perspective view of the power steering device

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 1st detection means 6 2nd detection means 5A, 6A Magnet 5B, 6B Magnetic detection element 11 Steering wheel 12 Steering shaft 14 Driver 14A Worm gear part 15 Motor 21, 31 Rotating body 21A, 31A Spur gear part 21B, 31B Spur Gear Section 22 First Detection Body 22A Spur Gear Section 23 Second Detection Body 23A Spur Gear Section 24 Wiring Board 27 Control Unit 30, 40 Rotation Angle Detection Device

Claims (1)

A rotating body that rotates in conjunction with the steering, a detecting body that rotates in conjunction with the rotating body, a detecting means that detects the rotation of the detecting body, and a rotation angle of the rotating body based on a detection signal from the detecting means A rotation angle detection device comprising a control means for detecting the motor, and a connecting means for connecting a motor to the rotating body.

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