JP2013181937A - Rotation angle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation angle detection device with a simple configuration by which certain detection of a rotation angle regarding the rotation angle detection device which is mainly used for detection of the rotation angle of a brake pedal of an automobile, etc.SOLUTION: There is provided a rotation angle detection device which can also be easily attached to a brake pedal, etc., with a simple configuration with a less number of used components, and by which certain detection of a rotation angle since the rotation angle detection device is rotatably stored in a case 21 approximately in the box shape, and can detect the rotation angle of a rotor 22 by directly attaching the tip of a rotary shaft 22A to a rotary shaft 35A of the brake pedal 35 without using components such as a lever by attaching a magnet 24 to the center of a lower surface of the rotor 22 where the rotary shaft 22A projects from an upper surface of the case 21, and oppositely arranging a magnetism detection element 26 to the magnet 24 at an interval.

Description

  The present invention relates to a rotation angle detecting device mainly used for detecting a rotation angle of a brake pedal or the like of an automobile.

  In recent years, as the functions of automobiles have been improved, there are an increasing number of vehicles that perform various control of vehicles by detecting the depression amount and rotation angle of a brake pedal using various rotation angle detection devices and switches.

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

  FIG. 4 is a cross-sectional view of a conventional rotation angle detection device. In FIG. 4, reference numeral 1 denotes a case made of a substantially box-shaped insulating resin with an opening on the lower surface, 2 is a rotating body made of insulating resin, and insert molding is performed on the rotating body 2. A metal rotating shaft 2A fixed by, for example, is inserted into a substantially cylindrical spacer 3, and the rotating body 2 is rotatably accommodated in the case 1 through the spacer 3.

  The upper end of the rotating shaft 2A protrudes from the upper surface of the case 1, and one end of a metallic lever 4 is fixed to the upper end of the rotating shaft 2A by caulking or the like, and the other end of the lever 4 extends upward from the case 1. .

  Reference numeral 5 denotes a steel wire spring wound in a coil shape, and the lower end of the slightly twisted spring 5 is locked to the rotating body 2 and the upper end is locked to the upper surface of the case 1. The rotating body 2 is biased at a predetermined angle, and the lever 4 is held at a predetermined position.

  Furthermore, 6 is a magnet, 7 is a wiring board on which a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces, and the magnet 6 is mounted on the center of the lower surface of the rotating body 2 by a holder 8 made of insulating resin. A magnetic detection element 9 such as a Hall element is mounted on the upper surface of the substrate 7 so as to face the magnet 6 with a predetermined gap.

  A control means 10 is formed on the wiring board 7 by electronic components such as a microcomputer, and a magnetic detection element 9 is electrically connected to the control means 10 via a wiring pattern.

  Reference numeral 11 denotes a substantially L-shaped terminal, which is implanted in the case 1 by insert molding or the like, and the control means 10 is connected to one end of the plurality of terminals 11 via a wiring pattern, and the other end of the terminal 11 is It extends into the connector portion 1A having a substantially rectangular tube shape.

  Further, reference numeral 12 denotes an insulating resin cover that covers the lower surface opening of the case 1, and the cover 12 is fixed to the lower surface of the case 1 to constitute a rotation angle detection device 13.

  Then, as shown in the side view of FIG. 5, the rotation angle detection device 13 configured in this way is attached in the vicinity of the rotation shaft 15A of the brake pedal 15 of the automobile, and the lever 4 is attached to the arm 15B. At the same time, the control means 10 is connected to an electronic circuit (not shown) of the vehicle via a plurality of terminals 11 and lead wires (not shown).

  In the above configuration, when the brake pedal 15 is stepped on with a foot, the lever 4 swings as the arm 15B rotates, and the rotating body 2 rotates while bending the spring 5, and the magnet mounted on this lower surface Since 6 also rotates, the direction of the magnetic field flowing from the magnet 6 to the opposing magnetic detection element 9 changes.

  The magnetism detection element 9 detects this magnetism, and the control means 10 calculates the rotation angle of the rotating body 2, that is, the depression amount of the brake pedal 15 from the strength of the magnetism detected by the magnetism detection element 9. It is output to the electronic circuit of the automobile body, and various controls of the vehicle are performed according to the depression amount.

  That is, by depressing the brake pedal 15, the lever 4 is swung to rotate the rotating body 2 and the magnet 6, and the control means 10 determines the rotation angle of the rotating body 2 from the change in magnetism detected by the magnetic detection element 9. That is, the amount of depression of the brake pedal 15 is detected and various controls of the vehicle are performed.

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

JP 2010-271298 A

  However, in the conventional rotation angle detecting device, the lever 4 mounted on the arm 15B is swung by the depression operation of the brake pedal 15, and the rotating body 2 and the magnet 6 are rotated to rotate the rotating angle of the rotating body 2. Therefore, there are problems in that the number of parts used is large and the configuration is complicated, and it is troublesome to attach the brake pedal 15 to the brake pedal 15.

  The present invention solves such a conventional problem, and provides a rotation angle detection device that can be easily mounted on a brake pedal and the like and can detect a rotation angle with a simple configuration. With the goal.

  In order to achieve the above object, the present invention is rotatably accommodated in a substantially box-shaped case, and a magnet is attached to the center of the lower surface of the rotating body whose rotating shaft protrudes from the upper surface of the case, and a gap is formed in the magnet. The rotation angle detection device is configured by arranging the magnetic detection elements facing each other, and without using parts such as a lever, the tip of the rotation shaft is directly attached to the rotation shaft of the brake pedal, and the rotation angle of the rotating body is adjusted. Since it can be detected, it can be easily mounted on a brake pedal, etc., and there is an effect that it is possible to obtain a rotation angle detection device capable of reliably detecting a rotation angle with a simple configuration with a small number of parts used. It is what you have.

  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 Same perspective view Sectional view of a conventional rotation angle detector Side view

  Hereinafter, embodiments 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 thereof, and in the same drawing, 21 is an opening made of an insulating resin such as a polybutylene terephthalate having a bottom opening. The case 22 is a substantially cylindrical and rotating body made of an insulating resin such as polyoxymethylene. The rotating body 22 is rotatably housed in the case 21 and a substantially prismatic rotating shaft 22A is provided on the upper surface of the case 21. It protrudes upward from the opening hole 21A.

  Reference numeral 23 denotes a holder made of a thin metal such as a copper alloy or a steel plate, and a plurality of elastic claws 23A project from the front and rear and the left and right sides bent downward, and the holder 23 is It is elastically attached to the tip of the rotating shaft 22A.

  Reference numeral 24 denotes a substantially rectangular parallelepiped magnet such as ferrite or Nd—Fe—B alloy, and the magnet 24 is attached to the center of the lower surface of the rotating body 22 by insert molding or adhesion.

  Further, reference numeral 25 denotes a wiring board made of paper phenol, glass-filled epoxy, or the like. A plurality of wiring patterns (not shown) are formed on the upper and lower surfaces by copper foil or the like, and a magnet 24 and a predetermined wiring are formed on the upper surface of the wiring board 25 A magnetic detection element 26 such as a Hall element, which is disposed oppositely with a gap, is mounted on the wiring pattern by soldering or the like.

  A control means 27 is formed on the wiring board 25 by electronic components such as a microcomputer, and the magnetic detection element 26 is electrically connected to the control means 27 via a wiring pattern.

  Reference numeral 28 denotes a substantially L-shaped terminal made of a copper alloy or the like, which is implanted in the case 21 by insert molding or the like, and a control means 27 is connected to one end of the plurality of terminals 28 via a wiring pattern. The other end of the connector extends into the connector portion 21B having a substantially rectangular tube shape.

  Reference numeral 29 denotes a cover made of an insulating resin such as polybutylene terephthalate, which covers the lower surface opening of the case 21, and this cover 29 is fixed to the lower surface of the case 21 with a plurality of screws 30, thereby constituting the rotation angle detection device 31. Has been.

  As shown in the perspective view of FIG. 3, the rotation angle detection device 31 configured as described above has a rotation shaft 22A in which a holding body 23 is mounted at the tip in the vicinity of the rotation shaft 35A of the brake pedal 35 of the automobile. The tip is inserted into the square hole 35B of the rotation shaft 35A and attached and attached by a screw portion 35C or a nut 36, and the control means 27 is connected via a plurality of terminals 28, lead wires (not shown) or the like. , Connected to an electronic circuit (not shown) of the vehicle.

  At this time, the plurality of elastic claws 23A on the side surface of the holding body 23 attached to the tip of the rotating shaft 22A are elastically deformed and elastically contacted with the inner periphery of the square hole 35B of the rotating shaft 35A. The rotating shaft 22A is mounted on the rotating shaft 35A in a state where there is no backlash between the holes 35B.

  In the above configuration, when the brake pedal 35 is stepped on with a foot, the arm 35D rotates about the rotating shaft 35A, and the rotating body 22 with the rotating shaft 22A inserted into the square hole 35B rotates, and this lower surface Since the mounted magnet 24 also rotates, the direction of the magnetic field flowing from the magnet 24 to the opposing magnetic detection element 26 changes.

  The magnetism detection element 26 detects this magnetism, and the control means 27 calculates the rotation angle of the rotating body 22, that is, the depression amount of the brake pedal 35 from the strength of the magnetism detected by the magnetism detection element 26. It is output to the electronic circuit of the automobile body, and various control of the vehicle is performed such as control of the brake device according to the depression amount, and extinguishing of the stop lamp.

  That is, when the brake pedal 35 is depressed, the rotating body 22 and the magnet 24 are rotated, and the control means 27 determines the rotation angle of the rotating body 22, that is, the depression amount of the brake pedal 35 from the change in magnetism detected by the magnetic detection element 26. And various controls of the vehicle are performed.

  At this time, in the rotation angle detection device 31 of the present invention, the rotation of the brake pedal 35 is directly rotated at the tip of the rotating shaft 22A of the rotating body 22 with the magnet 24 mounted at the center of the lower surface without using parts such as a lever. Since it is mounted on the shaft 35A, it is possible to reliably detect the rotation angle and easily mount the brake pedal 35, so that the number of parts used can be reduced and the structure can be simplified.

  That is, a rotation angle detection device is provided by mounting the magnet 24 at the center of the lower surface of the rotating body 22 rotatably accommodated in the case 21 and mounting the tip of the rotation shaft 22A directly on the rotation shaft 35A of the brake pedal 35. 31 can be formed in a simple configuration, and errors due to dimensional variations in parts used such as a lever are reduced, so that a reliable rotation angle can be detected.

  Further, a holding body 23 having a plurality of elastic claws 23A projecting from the side surface is attached to the tip of the rotating shaft 22A. When the holding body 23 is attached to the rotating shaft 35A, the plurality of elastic claws 23A are elastically deformed and rotated. By elastically contacting the inner periphery of the square hole 35B of the dynamic shaft 35A, the rotary shaft 22A is mounted on the rotary shaft 35A in a state where there is no rattling between the tip of the rotary shaft 22A and the square hole 35B. The rotation angle can be detected with little and high accuracy.

  In the above description, the control means 27 is provided on the wiring board 25 housed in the case 21 by an electronic component such as a microcomputer, and the control means 27 is connected to the rotating body 22 based on the strength of magnetism detected by the magnetic detection element 26. Although the configuration for calculating the rotation angle has been described, the present invention can be implemented even when the wiring board 25 is provided with only the magnetic detection element 26 and the control means 27 is provided on the electronic circuit side of the vehicle.

  As described above, according to the present embodiment, the magnet 24 is attached to the center of the lower surface of the rotating body 22 that is rotatably accommodated in the substantially box-shaped case 21 and the rotating shaft 22A protrudes from the upper surface of the case 21, and this By disposing the magnetism detection element 26 so as to face the magnet 24 with a gap, the tip of the rotating shaft 22A is directly attached to the rotating shaft 35A of the brake pedal 35 without using a component such as a lever, and the rotating body 22 rotates. Since it can detect the angle, it can be easily mounted on a brake pedal, etc., and a rotation angle detection device capable of reliably detecting the rotation angle with a simple configuration with a small number of parts used can be obtained. It is.

  Further, by attaching the holding body 23 having the elastic claw 23A protruding from the side surface to the tip of the rotation shaft 22A, when the tip of the rotation shaft 22A is attached to the rotation shaft 35A, the elastic claw 23A is elastically deformed and the rotation shaft. Since the rotary shaft 22A is mounted on the rotary shaft 35A in a state where the rotary shaft 22A is elastically contacted with the inner periphery of the 35A square hole 35B and there is no rattling between the tip of the rotary shaft 22A and the square hole 35B, there is less error and high accuracy. The rotation angle can be detected.

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

DESCRIPTION OF SYMBOLS 21 Case 21A Opening hole 21B Connector part 22 Rotating body 22A Rotating shaft 23 Holding body 23A Elastic claw 24 Magnet 25 Wiring board 26 Magnetic detection element 27 Control means 28 Terminal 29 Cover 30 Screw 31 Rotation angle detection device 35 Brake pedal 35A Rotating shaft 35B Square hole 35C Screw part 35D Arm 36 Nut

Claims (2)

Rotation angle in which a magnet is mounted in the center of the lower surface of the rotating body whose rotation axis protrudes from the upper surface of the case, and a magnetism detecting element is arranged oppositely with a gap in the magnet. Detection device. The rotation angle detection device according to claim 1, wherein a holding body with elastic claws protruding on a side surface is attached to a tip of the rotation shaft.

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