JP6248284B2 - Rotation angle detector - Google Patents

Description

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

  In many automobiles, the rotation angle of the steering is detected by a rotation angle detection device, and various control of the vehicle is performed using the rotation angle.

  Such a conventional rotation angle detection device will be described with reference to an exploded perspective view of the conventional rotation angle detection device of FIG.

  As shown in the figure, the rotating body 1 is formed from a synthetic resin in a circular ring shape with a central through hole 2. A spur gear portion 3 is formed on the outer peripheral side surface. A pair of locking portions 4 are formed at the inner peripheral position of the circular ring, and can be locked via a locking portion 4 to a steering shaft (not shown) inserted into the central through hole 2. Is formed.

  Reference numeral 5 denotes a first detection body made of a synthetic resin having a spur gear portion 6 formed on the outer peripheral side surface. The spur gear portion 6 of the first detection body 5 meshes with the spur gear portion 3 of the rotating body 1. A magnet 8 is mounted at the center position of the first detection body 5.

  Reference numeral 10 denotes a second detection body made of synthetic resin in which a spur gear portion 11 is formed on the outer peripheral side surface. The spur gear portion 11 of the second detection body 10 is engaged with the spur gear portion 6 of the first detection body 5. A magnet 13 is mounted at the center position of the second detection body 10.

  Reference numeral 15 denotes a synthetic resin upper case having a substantially circular opening 16. A substantially cylindrical support portion 17 and a plurality of central shaft portions 18 are provided on the back surface of the upper case 15. The support part 17 is arranged corresponding to the location of the rotating body 1. The plurality of central shaft portions 18 are arranged corresponding to the arrangement positions of the first detection body 5 and the second detection body 10, and the first detection body 5 and the second detection body 10 are respectively connected to the corresponding central shaft portions 18. It is held rotatably.

  The wiring board 20 is disposed substantially parallel to the lower position of the first detection body 5 and the second detection body 10. Magnetic detection elements 23 and 25 are mounted on the wiring board 20. The magnetic detection element 23 faces the magnet 8 of the first detection body 5, and the magnetic detection element 25 faces the magnet 13 of the second detection body 10. Further, a control unit 27 composed of a microcomputer or the like is mounted on the wiring board 20. The magnetic detection elements 23 and 25 are connected to the control unit 27.

  Reference numeral 30 denotes a synthetic resin lower case provided with a substantially circular opening 31. The lower case 30 is integrally provided with a male connector portion 32. The connector portion 32 has a structure having a plurality of rod-shaped pins in a substantially box-shaped housing that opens outward, and each pin has a side wall portion 33 opposite to the opening side of the connector portion 32. And protrudes as a terminal 34 inside the lower case 30. Each terminal 34 is bent in a substantially U shape so that the tip is directed upward.

  In the wiring board 20, the first hole portion 21 is inserted into a boss 35 provided in the lower case 30, and the position of the wiring substrate 20 is regulated in the horizontal direction or downward. Each tip of the terminal 34 of the connector portion 32 is inserted into a second hole portion 22 provided in the wiring board 20 and fixed by soldering or the like. That is, the output signal from the control unit 27 can be transmitted to the device side through each terminal 34.

  The upper case 15 and the lower case 30 are integrated such that the openings 16 and 31 of the upper case 15 and the lower case 30 overlap the central through hole 2 of the rotating body 1 in the vertical direction. At that time, the boss 35 of the lower case 30 is fitted into the positioning recess 19 on the back surface of the upper case 15 so that the wiring board 20 is sandwiched. The rotating body 1, the first detecting body 5, and the second detecting body 10 are disposed in a housing state so as to be rotatable in a casing constituted by the upper case 15 and the lower case 30.

  The conventional rotation angle detection device is configured as described above. As a mounting state, a female connector (not shown) of a lead wire wired from the automobile main body is connected to the connector portion 32, and the steering shaft is locked to the locking portion 4 of the rotating body 1, thereby driving the vehicle. Mounted on.

  In the above configuration, when the steering wheel is rotated, the rotating body 1 locked to the steering shaft rotates, and the first detecting body 5 rotates in conjunction with the rotating body 1, and further interlocks with the first detecting body 5. As a result, the second detector 10 rotates. As a result, the magnet 8 attached to the center of the first detector 5 and the magnet 13 attached to the center of the second detector 10 also rotate horizontally.

  The change of each magnetic flux according to the rotation of the magnets 8 and 13 is detected by the corresponding magnetic detection elements 23 and 25, respectively, and output as detection signals composed of voltage waveforms of sine waves and cosine waves. Here, the first detection body 5 and the second detection body 10 have different numbers of teeth and different rotation speeds, and the output waveforms of the magnetic detection elements 23 and 25 are detection signals having different periods and shifted phases. .

  The control unit 27 performs a predetermined calculation based on the two different detection signals from the first detection body 5 and the second detection body 10 and the number of teeth of each, and the rotation angle of the rotation body 1, that is, the rotation angle of the steering wheel is determined. The detected angle is output to the electronic circuit of the automobile, 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 2012-189530 A

  Since the conventional rotation angle detecting device detects the rotation angle of the rotating body 1 in a non-contact manner, it has a long life and high reliability. However, a vehicle manufacturer may request a more reliable one, and may request a configuration proposal that takes measures against dust and the like entering the housing from the location where the rotating body 1 is disposed. It was.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a rotation angle detection device having a configuration in which reliability is further improved.

To achieve the above object, the present invention provides a housing, a rotating body rotatably disposed in the housing, a detection body that rotates together with the mounted magnet in conjunction with the rotation of the rotating body, and a magnet. And a wiring board provided with a magnetic detection element for detecting a change in magnetic flux of the housing, and the housing is provided with a space portion whose opening is closed by a sealing member, and the wiring board is installed in the space portion. And a rotation angle detection device in which a magnetic detection element disposed in the space portion faces a magnet disposed outside the space portion, and the magnet and the magnetic detection element constitute a space portion of the housing The rotation angle detection device is configured to be opposed to each other through a wall, provided with a hollow portion on the wall, the detection body being restricted by the inner peripheral surface of the hollow portion, and arranged rotatably in the hollow portion. It is.

  In this case, even if dust or water enters the housing from the location where the rotating body is placed, installing the wiring board in the space suppresses the influence on the wiring board and the magnetic detection element mounted on the wiring board. Thus, there is an effect that a rotation angle detecting device having a configuration with improved reliability can be obtained.

  As described above, according to the present invention, it is possible to provide an advantageous effect that it is possible to provide a rotation angle detection device having a configuration with improved reliability.

Sectional drawing of the rotation angle detection apparatus by one embodiment of this invention Exploded perspective view An exploded perspective view of a conventional rotation angle detection device

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

(Embodiment)
FIG. 1 is a sectional view of a rotation angle detection device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.

  As shown in the figure, the rotation angle detection device according to this embodiment has a casing configured by connecting an upper case 80 to a lower case 40.

  The lower case 40 is made of synthetic resin, and has a substantially circular opening 41 (see FIG. 2) penetrating vertically at a position on one end side thereof. An annular protrusion 42 that protrudes upward is formed at a peripheral position of the opening 41.

  As understood from FIG. 1, the lower case 40 has a configuration in which the other end side has a hollow box-like portion 45. The box-shaped part 45 is surrounded by a first side wall part 48 at a position corresponding to one end side, a second side wall part 49 and a third side wall part 50 facing left and right between the top plate part 46 and the bottom plate part 47. And only the other end is open.

  On the top plate portion 46, two circular recess portions 51 and 52 (see FIG. 2) are configured. The circular depression 51 is provided as an arrangement place for a first detection body 61 described later, and the circular depression 52 is provided as an arrangement place for a second detection body 72 described later.

  The circular depressions 51 and 52 are formed in a hole shape with a bottom. That is, as shown in FIG. 1, the inner bottom surface of the circular recess 51 is constituted by a part of the top surface of the top plate portion 46. The circular recess 52 has the same configuration. In other words, the top plate portion 46 corresponds to the wall of the claims. As described above, the circular depressions 51 and 52 are provided in a shape not connected to the box-like part 45 with the top plate part 46 as a boundary. And the inner bottom face of the circular hollow parts 51 and 52 is comprised by the flat horizontal surface.

  A rotating body 55 is placed on the annular protrusion 42 of the lower case 40 so as to be horizontally rotatable. The rotating body 55 is made of synthetic resin, and the shape thereof is a circular ring shape with a central through hole 56 as in the prior art, and a spur gear portion 57 is formed on the outer peripheral side surface. Although not shown, a locking portion for locking to a steering shaft (not shown) is formed at the inner peripheral position of the circular ring.

  A spur gear portion 62 provided on the outer peripheral side surface of the first detection body 61 is engaged with the spur gear portion 57 of the rotating body 55. The first detector 61 is made of synthetic resin. Further, the first detector 61 has a first protrusion 63 that protrudes downward. The first protrusion 63 has a circular shape whose horizontal cross section is slightly smaller than that of the circular recess 51, and the center axis of the first protrusion 63 and the center axis of the spur gear part 62 coincide with each other.

  The first detection body 61 is disposed in the lower case 40 so that the first protrusion 63 is inserted into the circular recess 51 and the horizontal rotation is possible. That is, the outer peripheral surface of the first protrusion 63 is restricted by the inner peripheral surface of the circular recess 51, and the lower end of the first protrusion 63 is disposed in contact with the inner bottom surface of the circular recess 51. A magnet 64 is mounted at the center of the lower surface of the first protrusion 63.

  The spur gear portion 73 provided on the outer peripheral side surface of the second detection body 72 meshes with the spur gear portion 62 of the first detection body 61. The second detector 72 is made of synthetic resin. Further, the second detector 72 has a second projecting portion 74 projecting downward. The second protrusion 74 has a circular shape whose horizontal cross section is slightly smaller than that of the circular recess 52, and the center axis of the second protrusion 74 and the center axis of the spur gear 73 are configured to coincide with each other.

  The second detector 72 is disposed in the lower case 40 so that the second protrusion 74 can be inserted into the circular recess 52 and can be rotated horizontally. That is, the outer peripheral surface of the second projecting portion 74 is regulated by the inner peripheral surface of the circular recess portion 52, and the lower end of the second projecting portion 74 is disposed in contact with the inner bottom surface of the circular recess portion 52. A magnet 75 is attached to the center of the lower surface of the second protrusion 74.

  The upper case 80 is made of synthetic resin, and has a substantially circular opening 81 (see FIG. 2) penetrating vertically at a position on one end side thereof. An annular protrusion 82 (see FIG. 1) that protrudes downward is formed around the opening 81. When the upper case 80 and the lower case 40 are combined, the annular protrusion 82 is provided at a position facing the annular protrusion 42 of the lower case 40 in the vertical direction.

  In addition, on the back surface of the upper case 80, a detection body restricting portion 83 (see FIG. 1) is provided above the first detection body 61. Similarly, although not shown in the drawing, a detection body restricting portion above the second detection body 72 is also provided on the back surface of the upper case 80.

  The upper case 80 is disposed so as to cover the lower case 40 on which the rotating body 55, the first detection body 61, and the second detection body 72 are disposed, and is coupled to the lower case 40.

  In the coupled state of the upper case 80 and the lower case 40, as shown in FIG. 1, the rotating body 55 has a ring-shaped portion formed in a thin plate shape sandwiched between the annular protrusions 82 and 42 and horizontally. Is held rotatably. The opening 81 of the upper case 80 and the opening 41 of the lower case 40 overlap with the central through hole 56 of the rotating body 55 in the vertical direction.

  Then, the first detection body 61 is incorporated in a state in which the upper position restriction is made by the detection body restriction portion 83 and can be rotated horizontally. Similarly, the second detection body 72 is not shown with an upper position restriction. It is incorporated in a state in which horizontal rotation made by the detection body restricting portion is possible.

  The box-shaped portion 45 of the lower case 40 is isolated from the above-described rotating body 55, the first detection body 61, and the second detection body 72 by the top plate portion 46. In other words, the box-shaped portion 45 is provided so as to be isolated from the arrangement location of the rotating body 55, the first detection body 61, and the second detection body 72. A resin-made sealing member 91 is coupled to the opening of the box-shaped part 45, and the inside of the box-shaped part 45 is configured as a sealed space. This space portion is set at a place where the wiring board 85 is provided. The wiring board 85 has a magnetic detection element 86 for the magnet 64 mounted on the first detection body 61 and a second detection body 72. A magnetism detecting element 87 for the magnet 75 and a control unit 88 composed of a microcomputer or the like are mounted by soldering or the like. The wiring board 85 may be made of a hard material made of glass epoxy or paper phenol.

  A substrate mounting portion 53 is provided on the inner surfaces of the second side wall portion 49 and the third side wall portion 50 forming the box-shaped portion 45. Each of the board mounting portions 53 is formed in a U-shaped cross-sectional view with an inner opening and a positional relationship in which the U-shaped opening portions face each other at the same height position. As can be seen from FIG. 1, the length of the board mounting portion 53 is provided from one end side to the other end side of the inner surfaces of the second side wall portion 49 and the third side wall portion 50. Are inserted into the U-shaped opening portions facing each other at the substrate mounting portions 53 and arranged in a horizontal state. The board mounting portion 53 also serves to regulate the position of the wiring board 85 in the vertical direction.

  And as mentioned above, the resin-made sealing member 91 is couple | bonded with the opening part of the box-shaped part 45, and the inside of the box-shaped part 45 is comprised by the sealed space part by this. The method of bonding the sealing member 91 may be performed by adhesion or the like, but may be performed by laser welding or ultrasonic welding.

  In the state where the sealing member 91 is coupled, as can be seen from FIG. 1, the wiring board 85 is positioned at one end side by the inner surface of the first side wall portion 48, and the other end side is positioned by the inner surface of the sealing member 91. It is in the state that was done. That is, the wiring board 85 is installed in a space defined by the box-shaped portion 45 and the sealing member 91 in a state where the position is regulated in the vertical direction and the horizontal direction.

  In the installed state of the wiring board 85, the magnetic detection element 86 is opposed to the magnet 64 in the vertical direction through the top plate portion 46, and the magnetic detection element 87 is opposed to the magnet 75 in the vertical direction through the top plate portion 46. ing.

  An L-shaped pin header 89 is attached to the wiring board 85. The sealing member 91 is provided with a rectangular housing 92 that forms a connector portion in cooperation with a plurality of pins 90 extending horizontally toward the other end side of the substrate surface of the pin header 89. That is, as shown in FIG. 1, a plurality of pins 90 are inserted into the inner side wall portion 93 in the housing 92, and a connector portion is configured by the tip side of the plurality of pins 90 and the housing 92. .

  As described above, the rotation angle detection device according to this embodiment is configured.

  When mounted on an automobile, the steering shaft is inserted into the central through hole 56 of the rotating body 55 and locked, and the female connector of the lead wire wired from the automobile body is connected to the distal end side of the pin 90 and the housing 92. It is mounted by being connected to the connector part composed of

  In the above configuration, when the steering wheel is rotated, the rotating body 55 locked to the steering shaft is rotated as in the conventional case. The first detection body 61 rotates in conjunction with the rotation, and the second detection body 72 rotates in conjunction with the first detection body 61. As a result, the magnet 64 mounted at the center of the first detection body 61 and the magnet 75 mounted at the center of the second detection body 72 also rotate, and the corresponding magnetic detection elements 86 and 87 detect the respective magnetic flux changes. To do.

  At this time, in this configuration, the wiring substrate 85 is positioned in the horizontal direction on the inner surface of the box-shaped portion 45 and the inner surface of the sealing member 91. The circular depressions 51 and 52 are integrally provided at the position of the top plate 46 on the magnetic detection elements 86 and 87 at the installation position of the wiring board 85. If this is the case, the magnets 64 and 75 can be accurately moved up and down above the magnetic detection elements 86 and 87 only by arranging the first detection body 61 and the second detection body 72 in the circular depressions 51 and 52. It can be configured to be arranged facing each other.

  In addition, if the arrangement | positioning precision of the magnetic detection elements 86 and 87 and the magnets 64 and 75 becomes high, the detection precision in the magnetic detection elements 86 and 87 will also become high.

  Then, the corresponding magnetic detection elements 86 and 87 detect changes in the magnetic flux according to the rotation of the magnets 64 and 75, respectively, and output the detection signals as voltage waveforms of sine waves and cosine waves.

  Note that the first detector 61 and the second detector 72 have the same number of teeth and different rotation speeds as before, and the periods from the magnetic detection elements 86 and 87 are different and their phases are shifted. From the detection signal and the number of teeth of each of the first detection body 61 and the second detection body 72, the control unit 88 performs a predetermined calculation to detect the rotation angle of the rotating body 55, that is, the rotation angle of the steering wheel, Similarly, the angle is output to the electronic circuit of the automobile and various controls of the vehicle are performed.

  As described above, in this configuration, the lower case 40 is provided with the box-shaped portion 45 that is isolated from the arrangement location of the first detection body 61, the second detection body 72, and the rotating body 55, and Assuming that the opening portion of the box-shaped portion 45 is covered with a sealing member 91 to provide a space portion, a wiring board 85 equipped with magnetic detection elements 86 and 87 is installed in the space portion. In this case, even if dust, water, or the like enters the casing from the location where the rotating body 55 is disposed in the casing configured by combining the lower case 40 with the upper case 80, the dust, water, etc. It is possible to prevent intrusion into the part. For this reason, it can be proposed that there is little influence on the wiring board 85 and the magnetic detection elements 86 and 87 attached thereto due to the dust and the like, and the reliability is further improved. At the time of mounting, the mating female connector to be connected to the connector portion of the sealing member 91 may be mounted using a connector excellent in dustproofness and waterproofness.

  In the above description, the case in which the box-shaped portion 45 is provided integrally with the lower case 40 has been described as an example. If the space part isolated with respect to the arrangement | positioning location of the 1st detection body 61, the 2nd detection body 72, and the rotary body 55 is comprised here, for example, the top-plate part 46 of the box-shaped part 45 will be another components. It is good also as comprising combining with. The detailed shapes of the box-shaped portion 45 and the top plate portion 46 may be set as appropriate.

  Moreover, it is preferable to use the sealing member 91 because the space can be easily sealed. In addition, what is necessary is just to determine the presence or absence of the connector part of the sealing member 91 suitably.

  Furthermore, the positioning method of the wiring board 85 in the space is not limited to the above-described configuration. Further, the mounting method of the first detection body 61 and the second detection body 72 is not limited to the configuration described above. The casing may have a configuration other than the combination of the upper case 80 and the lower case 40.

  In the above description, the first detector 61 and the second detector 72 have been described as examples. However, the number and the engagement state with the rotary body 55 are not limited, and the rotation is not limited. The rotation transmission means during rotation including the body 55 may be configured using other means.

  Note that the idea based on the configuration according to the present invention can be applied to devices other than the rotation angle detection device.

  The rotation angle detection device according to the present invention can be provided with improved reliability, and is useful for detecting the rotation angle of an automobile steering.

40 Lower case 41 Opening portion 42 Ring-shaped projection 45 Box-shaped portion 46 Top plate portion 47 Bottom plate portion 48 First side wall portion 49 Second side wall portion 50 Third side wall portion 51, 52 Circular recess portion 53 Substrate mounting portion 55 Rotating body 56 Central through hole 57 Spur gear portion 61 First detector 62 Spur gear portion 63 First protrusion 64 Magnet 72 Second detector 73 Spur gear portion 74 Second protrusion 75 Magnet 80 Upper case 81 Opening portion 82 Annular protrusion 83 Detection body regulating portion 85 Wiring board 86, 87 Magnetic detection element 88 Control portion 89 Pin header 90 Pin 91 Sealing member 92 Housing 93 Side wall portion

Claims (1)

A housing,
A rotating body rotatably disposed in the housing;
In conjunction with the rotation of the rotating body, a detecting body that rotates with the attached magnet;
A wiring board provided with a magnetic detection element for detecting a change in magnetic flux from the magnet,
The casing is provided with a space portion whose opening is closed by a sealing member, and the wiring board is installed in the space portion, and the magnetic detection element disposed in the space portion has the A rotation angle detection device facing the magnet disposed outside the space part ,
The magnet and the magnetic detection element are opposed to each other through a wall constituting the space portion of the housing, and a depression is provided in the wall, and the detection body is restricted by an inner peripheral surface of the depression. And a rotation angle detection device rotatably disposed in the recess.

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