JP2007278963A - Rotation angle and torque detection device - Google Patents

Abstract

An object of the present invention is to provide a rotation angle and torque detecting device that can be easily replaced even if the diameter and mechanism of a shaft portion are different due to a difference in vehicle type and can be easily attached.
A shaft portion having a torsion bar, a rotation angle detecting portion for detecting a rotation angle of the shaft portion, and a torque detecting portion for detecting a torque of the shaft portion are provided. The rotation angle detection unit is configured as a first torque detection module 5, a second torque detection module 7, and a rotation angle detection module 9, and is arranged around the shaft unit 8.
[Selection] Figure 1

Description

  The present invention relates to a rotation angle and torque detection device used for vehicle power steering and the like.

  In FIG. 9, the conventional rotation angle and torque detection device has two gear portions 59 attached to a rotation shaft (not shown) whose rotation angle is to be detected via an engagement spring 60. The gear portion 59 meshes with a gear portion 62 that holds a code plate 61 in which different magnetic poles are alternately arranged on the outer peripheral surface. Since the magnetic pole provided on the code plate 61 rotates and moves according to the rotation of the rotating shaft to be detected, the displacement of the magnetic pole is counted by the magnetic detection element 63 provided facing the outer peripheral surface of the code plate 61. The rotation angle of the rotation shaft can be detected.

  Also, by attaching this mechanism to two shafts connected via a torsion bar, when the torque acts between the two shafts and a twist occurs between the shafts, the rotation angles of the rotating shafts are compared. Thus, the torque can be detected.

  The rotation angle and torque detection device includes a magnet forming step for magnetizing the magnetic poles on the code plate 61 and an attachment step for attaching the gear portion 62 so as to mesh with the gear portion 59. Generally, as for the magnetic poles of the code plate 61, gear portions 62 to which the code plate 61 before magnetization is attached are set in a magnetizer, and different magnetic poles are alternately arranged at predetermined intervals in the circumferential direction of the code plate 61. So as to be magnetized. And the two gear parts 62 are attached to the rotating shaft so as to face each other.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-11-194007

  The conventional rotation angle and torque detection device is disposed on a steering column on the handle side and attached to a shaft portion that transmits the rotation of the handle. The diameter and mechanism of the shaft portion vary depending on the vehicle type, and a rotation angle and torque detection device is attached to correspond to the shaft portion of each vehicle type.

  In the conventional configuration described above, the configuration for detecting the rotation angle and the configuration for detecting the torque are integrated, so if the shaft diameter and mechanism are different due to the difference in the vehicle type, it corresponds to the different configuration. It was difficult to replace the parts, and there was a problem that they could not be easily attached.

  The present invention solves the above-mentioned problems, and provides a rotation angle and torque detection device that can be easily replaced even if the shaft diameter and mechanism are different due to the difference in vehicle type and can be easily attached. The purpose is to do.

  In order to achieve the above object, in particular, the present invention is configured such that the rotation angle detection unit and the torque detection unit are configured as modules and each of the modules is attached to the shaft portion, and the mounting position of the module is attached to the shaft portion. In addition, a positioning part for positioning the module is provided, and the module is attached to the shaft part by regulating the position by the positioning part.

  With the above configuration, the rotation angle detection unit and the torque detection unit are configured as modules, so even if the shaft diameter and mechanism are different due to the difference in vehicle type, it is easy to replace the corresponding parts, Installation is easy.

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

  1 is a cross-sectional view of a rotation angle detection device according to an embodiment of the present invention, FIG. 2 is a perspective view of first and second rotating bodies of the detection device, and FIG. 3 is first and second views of the detection device. FIG. 4 is a cross-sectional view of a shaft portion where the first torque detection module of the detection device is arranged, and FIG. 5 is a second view of the detection device. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 7 is a left side view of FIG.

  In FIG. 1, a rotation angle and torque detection device according to an embodiment of the present invention includes a shaft portion 8 having a torsion bar 2, a rotation angle detection portion that detects the rotation angle of the shaft portion 8, and a shaft portion 8. A torque detection unit that detects torque, and the torque detection unit and the rotation angle detection unit are configured as a first torque detection module 5, a second torque detection module 7, and a rotation angle detection module 9, respectively. It arrange | positions around the axial part 8. FIG.

  2 to 4, the first torque detection module 5 includes the first rotating body 10 and the second rotating body 12 shown in FIG. 2, and the circumferential directions of the first and second rotating bodies 10 and 12. 3 have the first ring magnet part 14 and the second ring magnet part 16 shown in FIG. 3 held alternately by the first and second rotating bodies 10 and 12, As shown in FIG. 4, the first and second rotating bodies 10 and 12 are connected to the shaft portion 8, and the first torque detector 5 is attached to the shaft portion 8.

  5 to 7, the second torque detection module 7 includes a first magnetic detection element 18 and a second magnetic detection element 20 that are arranged opposite to the magnetic poles of the first and second ring magnet portions 14 and 16. .

  The rotation angle detection module 9 is connected to the shaft portion 8 and synchronized with the first rotator 10, the third rotator 22 and the fourth rotator 24 synchronized with the synchronous rotator 11, The third magnet part 26 and the fourth magnet part 26, which are alternately arranged with magnetic poles having different polarities in the circumferential direction of the third and fourth rotating bodies 22 and 24 and are held by the third and fourth rotating bodies 22 and 24, respectively. And a third magnetic sensing element 28 and a fourth magnetic sensing element (not shown) opposed to the magnetic poles of the third and fourth magnet parts 26 and 27.

  The synchronous rotator 11, the third and fourth rotators 22, 24 have a gear structure and are synchronously rotated by combining the teeth of each other. When the input shaft 4 rotates, the synchronous rotator 11, the fourth and fourth rotators 22, 24 are synchronized with the first rotator 10. The rotating body 11 rotates in synchronization with each other, and the third and fourth rotating bodies 22 and 24 also rotate in synchronization with each other. The rotational speed ratio of the third rotating body 22 relative to the synchronous rotating body 11 and the rotational speed ratio of the fourth rotating body 24 relative to the synchronous rotating body 11 are different from each other. The rotational speed ratio is made different by changing the gear ratio with different numbers of gears.

  The second module 7 is attached to the rotation angle detection module 9.

  Further, the rotation angle detection module 9 to which the second torque detection module 7 is attached is attached to the shaft portion 8. At this time, the first and second magnetic detection elements 18 and 20 of the second torque detection module 7 are mounted so as to face the first and second ring magnet portions 14 and 16 of the first torque detection module 5. is doing.

  The first torque detection module 5 and the rotation angle detection module 9 are attached with their positions regulated by a positioning portion provided on the shaft portion 8.

  When positioning the first torque detection module 5, for example, positioning on the peripheral surfaces of the first and second rotating bodies 10 and 12 shown in FIG. 2 as positioning portions of the first torque detection module 5 and the shaft portion 8. A through hole 32 is provided as a reference part for reference, a reference part for positioning reference is also provided in the shaft part 8 shown in FIG. 4, and the first and second rotating bodies 10 and 12 are pivoted in correspondence with these reference parts. What is necessary is just to connect to the part 8. As shown in FIG. 4, the reference portion of the shaft portion 8 is made to correspond to the through hole 32 of the first and second rotating bodies 10 and 12, and the connecting pin 33 is inserted into the through hole 32 for positioning. You can regulate it.

  In positioning the rotation angle detection module 9, a step portion 34 is provided on the shaft portion 8 shown in FIG. 4 as a positioning portion between the rotation angle detection module 9 and the shaft portion 8, and one surface of the rotation angle detection module 9 is provided on the step portion 34. Positioning may be performed by positioning them in contact with each other. Alternatively, as shown in FIG. 1, a case 38 that covers the first and second torque detection modules 5 and 7 and the rotation angle detection module 9 is arranged with other parts such as a bearing part 36 interposed therebetween, thereby restricting the position. May be.

  With the above configuration, the rotation angle detection unit and the torque detection unit are configured as a module, so even if the diameter and mechanism of the shaft 8 are different due to the difference in the vehicle type, it is easy to replace the corresponding parts. , Easy to install. For example, even if the diameter of the shaft portion 8 is different, if the first and second rotating bodies 10 and 12 of the first torque detection module 5 having different inner diameters are used, the replacement of the parts is easy and the second The torque detection module 7 and the rotation angle detection module 9 can be used without replacement.

  Further, since the rotational speed ratio of the third rotating body 22 to the synchronous rotating body 11 and the rotational speed ratio of the fourth rotating body 24 to the synchronous rotating body 11 are different, the third magnetic sensing element 28 and the The absolute rotation angle of the shaft portion 8 can also be detected based on the output signal output from the magnetic detection element 4.

  FIG. 8 is a characteristic waveform diagram showing the relationship between the mechanical angle and the electrical angle associated with the rotation of the shaft. FIG. 8 (a) is caused by a change in magnetic field with respect to the rotational angle (mechanical angle) of the synchronous rotating body. The rotation angle (electrical angle) detected by the third magnetic sensing element is shown. FIG. 8B shows the fourth magnetic sensing element due to a change in the magnetic field with respect to the rotation angle (mechanical angle) of the synchronous rotating body. FIG. 8C shows the third and fourth rotations with respect to the rotation angle (mechanical angle) of the synchronous rotating body calculated based on FIGS. 8A and 8B. It shows the rotation angle difference (electrical angle difference) of the body.

  Depending on the number of gears of the third and fourth rotating bodies 22 and 24, the rotation angle of the third and fourth rotating bodies 22 and 24 relative to the rotation angle (mechanical angle) of the third and fourth rotating bodies 22 and 24 ( The characteristic wave (triangular wave) of the electrical angle has different periods. Therefore, with respect to the rotation angle (mechanical angle) of the synchronous rotator 11, the characteristic waves (triangular waves) of the third and fourth rotators 22 and 24 each depend on what period of the characteristic wave (triangular wave), As shown in FIG. 8C, the characteristic waveform of the rotation angle difference (electrical angle difference) between the third and fourth rotating bodies 22 and 24 with respect to the rotation angle (mechanical angle) of the synchronous rotating body 11 is unambiguous. Therefore, the absolute rotation angle (mechanical angle) of the shaft portion 8 is determined.

  In the embodiment of the present invention, the third and fourth rotating bodies 22 and 24 are used. However, a configuration without using the fourth rotating body 24 may be used. In this case, the rotational speed ratio of the first rotating body 10 with respect to the synchronous rotating body 11 and the rotational speed ratio of the third rotating body 22 with respect to the synchronous rotating body 11 are made different, and the first magnetic sensing element 18 and the third Based on the output signal output from the magnetic sensing element 28, the absolute rotation angle of the shaft portion 8 can also be detected.

  The rotation angle and torque detection device according to the present invention can be easily used for power steering of various vehicles even if the shaft diameter and mechanism are different due to the difference in the vehicle type.

Sectional drawing of the rotation angle detection apparatus in one embodiment of this invention The perspective view of the 1st, 2nd rotary body of the same detection apparatus The perspective view of the 1st, 2nd ring magnet part hold | maintained at the 1st, 2nd rotary body of the same detection apparatus. Sectional drawing of the axial part which has arrange | positioned the 1st torque detection module of the same detection apparatus. Top view of the rotation angle detection module with the second torque detection module of the same detection device attached AA sectional view of FIG. Left side view of FIG. Characteristic waveform diagram showing the relationship between mechanical angle and electrical angle with shaft rotation Sectional view of a conventional rotation angle and torque detector

Explanation of symbols

2 Torsion Bar 4 Input Shaft 5 First Torque Detection Module 6 Output Shaft 7 Second Torque Detection Module 8 Shaft 9 Rotation Angle Detection Module 10 First Rotating Body 11 Synchronous Rotating Body 12 Second Rotating Body 14 First Ring magnet section 16 second ring magnet section 18 first magnetic sensing element 20 second magnetic sensing element 22 third rotating body 24 fourth rotating body 26 third magnet section 27 fourth magnet section 28 Third magnetic sensing element 32 Through hole 33 Connecting pin 34 Stepped portion 36 Bearing part 38 Case

Claims (3)

A shaft portion having a torsion bar; a rotation angle detection portion for detecting a rotation angle of the shaft portion; and a torque detection portion for detecting a torque of the shaft portion, wherein the rotation angle detection portion and the torque detection portion are modules. And each of the modules is attached to the shaft portion. The shaft portion is provided with a positioning portion for positioning the mounting position of the module, and the position of the module is restricted by the positioning portion. Rotation angle and torque detection device attached to. The torque detecting section alternately arranges first and second rotating bodies connected to the shaft section so as to sandwich the torsion bar, and magnetic poles having different polarities in the circumferential direction of the first and second rotating bodies. And first and second magnet parts held by the first and second rotating bodies, and first and second magnetic sensing elements opposed to the magnetic poles of the first and second magnet parts, Have
The rotation angle detector is connected to the shaft portion and is synchronized with one of the first and second rotators, a third rotator synchronized with the synchronous rotator, and the third The magnetic poles having different polarities are alternately arranged in the circumferential surface direction of the rotating body, and a third magnet portion held by the third rotating body and a third magnet portion opposed to the magnetic pole of the third magnet portion A magnetic sensing element,
2. The rotation angle and torque detection device according to claim 1, wherein a rotation speed ratio of the first rotating body with respect to the synchronous rotating body is different from a rotation speed ratio of the third rotating body with respect to the synchronous rotating body. The torque detecting section alternately arranges first and second rotating bodies connected to the shaft section so as to sandwich the torsion bar, and magnetic poles having different polarities in the circumferential direction of the first and second rotating bodies. And first and second magnet parts held by the first and second rotating bodies, and first and second magnetic sensing elements opposed to the magnetic poles of the first and second magnet parts, Have
The rotation angle detection unit is connected to the shaft portion and synchronized with one of the first and second rotators, and third and fourth rotators synchronized with the synchronization rotator, Third and fourth magnet portions alternately arranged with different magnetic poles in the circumferential direction of the third and fourth rotating bodies and held by the third and fourth rotating bodies, and the third And third and fourth magnetic sensing elements opposed to the magnetic poles of the fourth magnet portion,
2. The rotation angle and torque detection device according to claim 1, wherein a rotation speed ratio of the third rotating body with respect to the synchronous rotating body is different from a rotation speed ratio of the fourth rotating body with respect to the synchronous rotating body.

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