JP5451573B2 - Rotation angle detector and motor actuator provided with the rotation angle detector - Google Patents

Description

  The present invention relates to a rotation angle detector for detecting a rotation angle of a rotation shaft and a motor actuator provided with the rotation angle detector.

  For example, a motor actuator that is driven by an electric motor is known as a drive source for an airflow control valve of an air conditioner used in a vehicle such as an automobile.

This motor actuator includes an upper case 101 and a lower case 102 shown in FIGS. 10A and 10B, and a rotating shaft (output shaft) 104 to which the rotation of the motor 103 is transmitted is sandwiched between upper and lower cases. Yes. Further, a potentiometer 105 of a rotation angle detector that detects the angle of the rotation shaft 104 by inserting the rotation shaft 104 is attached to the lower case 102.
The potentiometer 105 includes a rotating body 107 having a mounting hole in which the insertion portion of the rotating shaft 104 is mounted, a brush 106 provided, and a resistor substrate that supports the rotating body 107 and is disposed to face the brush 106. A non-rotating body 108 is provided.

  The potentiometer 105 and the rotating shaft 104 cannot have the same dimension as the mounting hole of the potentiometer 105 and the rotating shaft 104, and there is usually a dimensional difference. At this time, for example, if the mounting hole is made slightly larger than the rotating shaft 104, the fitting play caused thereby becomes a dead zone, and the accuracy of detecting the angle of the rotating shaft is lowered. If the fitting hole is slightly smaller than the rotating shaft 104 and press-fitted, the fitting play can be eliminated and the detection accuracy can be improved. However, the press-fitting keeps applying a load to the potentiometer, and cracks and deformation are not caused. It becomes a cause and durability will fall.

  In order to solve such a problem, for example, in Patent Document 1, as shown in FIG. 11, a hemispherical protrusion (pressure contact) that is plastically deformed on a plane portion of a D-cut shape hole that constitutes the mounting hole 109 of the potentiometer 105. Part) 110 is formed. According to such a structure, when the rotating shaft is inserted into the mounting hole, the hemispherical projection is plastically deformed, and as shown in FIG. 10, the approximate center of the insertion portion of the rotating shaft is fixed to the mounting hole, and the potentiometer It is said that the angle detection accuracy of the rotating shaft can be improved without applying a large load on the rotating body and eliminating the backlash between the rotating body and the rotating shaft.

JP 2002-267439 A

  However, in the rotation angle detector as shown in FIG. 11, the hemispherical protrusion is crushed and plastically deformed by the distal end side in the insertion direction of the rotating shaft while the rotating shaft is inserted into the mounting hole, and is thus fixed by the hemispherical protrusion. If there is a sink at the time of molding of the rotary shaft in the approximate center of the insertion site of the rotary shaft, after the rotary shaft is inserted into the mounting hole, a very large backlash occurs between the hemispherical protrusion and the rotary shaft. There is a problem that the angle detection accuracy of the rotating shaft is lowered.

  In view of the above, an object of the present invention is to provide a rotation angle detector that suppresses the occurrence of the above-described engagement play and a motor actuator including the rotation angle detector.

The rotation angle detector according to claim 1 of the present invention, which is configured to achieve the above object,
A rotation angle detector having a rotation shaft mounted in the mounting hole of the rotation member and having a fitting structure for transmitting the rotation motion of the rotation shaft to the rotation member,
The rotating member has a convex pressure contact portion for pressing the pressure contact portion of the rotating shaft on the inner surface of the mounting hole,
The inner surface or the rotation shaft is provided with a protrusion for regulating the distance between the base end of the pressure contact portion and the pressure contact portion of the rotation shaft,
The protruding portion extends in the entire thickness direction of the rotating member or is formed from the tip in the inserting direction of the rotating shaft,
The rotating shaft is characterized in that a recess that does not contact the pressure contact portion is provided on the distal end side in the insertion direction.

The rotation angle detector according to claim 2 of the present invention is the rotation angle detector according to claim 1,
The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion and the protruding portion are formed in the planar portion,
The pressure contact portion is higher than the protruding portion.
The rotation angle detector according to claim 3 of the present invention is the rotation angle detector according to claim 2,
A plurality of the protruding portions are formed with the pressure contact portion interposed therebetween.

The rotation angle detector according to claim 4 of the present invention is the rotation angle detector according to claim 1,
The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion is formed in the planar portion,
The protruding portion is formed on the flat portion,
The pressure contact portion is higher than the protruding portion.
The rotation angle detector according to claim 5 of the present invention is the rotation angle detector according to claim 4,
The protruding portion is formed on the planar portion so as to be sandwiched between the two pressure contact portions provided to face the planar portion.

The rotation angle detector according to claim 6 of the present invention is the rotation angle detector according to claim 1,
The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion is formed in the planar portion,
The protruding portion is formed on the flat portion,
Wherein the planar portion, a concave portion for engaging the front Ki突 out section is formed,
The depth of the concave portion is smaller than the height of the protruding portion.

A motor actuator according to a seventh aspect of the present invention includes the rotation angle detector according to any one of the first to sixth aspects.

  According to the present invention, the rotary shaft is provided with a recess not in contact with the press contact portion on the distal end side in the insertion direction, so that the press contact portion is not crushed by the rotary shaft until just before the rotary shaft is fixed to the mounting hole. Therefore, even if there is a sink mark during molding at the approximate center of the insertion portion of the rotating shaft that is fixed by the pressure contact portion, the rotating shaft is securely fixed to the mounting hole, and the occurrence of fitting play is suppressed. The

The rotation angle detector which concerns on the 1st Example of this invention is shown, (a) is a front view, (b) is sectional drawing of the cutting line AA in (a). The rotating shaft with which the mounting | wearing hole of the rotation angle detector of FIG. 1 is mounted | worn is shown, (a) is a front view, (b) is a bottom view of (a). FIG. 3 is a cross-sectional view of a main part in which a rotation shaft according to FIG. 2 is mounted in a mounting hole included in the rotation angle detector of FIG. 1. The fitting structure of the rotating shaft and mounting hole seen from the cutting line BB of FIG. 3 is shown. The fitting structure of the rotating shaft and mounting hole which concerns on the 2nd Example of this invention is shown. The rotating shaft which concerns on the example of 2nd Embodiment is shown, (a) is a front view of a rotating shaft, (b) is a bottom view of (a). The fitting structure of the rotating shaft and mounting hole which concerns on the 3rd Example of this invention is shown. The rotating shaft which concerns on the example of 3rd Embodiment is shown, (a) is a front view of a rotating shaft, (b) is a bottom view of (a). (A) is a top view of the finished product excluding the upper case of the motor actuator of the present invention, and (b) is a sectional view taken along the section line CC in (a). (A) is a top view of a finished product excluding an upper case of a conventional motor actuator, and (b) is a cross-sectional view taken along a cutting line DD in (a). The perspective view of the conventional rotation angle detector is shown.

  Hereinafter, embodiments of the rotation angle detector of the present invention will be described.

(First embodiment)
FIG. 1 shows a rotation angle detector 10 according to an example embodiment of the present invention. FIG. 2 shows the rotating shaft 1 mounted in the mounting hole 12 of the rotation angle detector 10 of FIG. FIG. 3 is a cross-sectional view showing a state where the rotating shaft 1 is mounted in the mounting hole 12 of the rotation angle detector 10. FIG. 4 shows a fitting structure between the rotating shaft and the mounting hole from the cutting line BB in FIG.

  The rotary shaft 1 of the present example has an insertion site 1A having a non-circular cross section, and the cross section of the insertion site 1A is substantially D-shaped. As shown in FIG. 2, the outer shape of the insertion portion 1A has a curved surface portion 1B and a flat surface portion 1C.

  The rotation angle detector 10 of this example is composed of a potentiometer, and includes a plastic rotating member 11 made of a plastic material and a non-rotating member 18 that pivotally supports the rotating member 11. The rotating member 11 has a mounting hole 12 through which the insertion part 1A of the rotating shaft 1 is inserted. The rotation angle detector 10 has a fitting structure for transmitting the rotational motion of the rotating shaft 1 to the rotating member 11 with the rotating shaft 1 mounted in the mounting hole 12 of the rotating member 11.

The rotating member 11 is provided with a brush 19. On the other hand, the non-rotating member 18 is provided with a resistor substrate (not shown) that is in sliding contact with the brush 19.
The brush 19 and the resistor substrate function as detection means for detecting the rotation angle of the rotation shaft 1 by the rotation of the rotation member 11, and can detect a voltage signal corresponding to the rotation angle of the rotation shaft 1.

  As shown in FIG. 1, the inner side surface 13 of the mounting hole 12 of the rotating member 11 of the present example is formed in a non-circular cross section (D-shaped cross section), and has a flat surface portion 14 and a curved surface portion 15. The mounting hole 12 is formed to be slightly larger than the outer shape of the insertion part 1A so that the insertion part 1A of the rotary shaft 1 is inserted.

The rotating member 11 has a convex pressure contact portion 16 that presses a flat surface portion 1 </ b> C (a pressure contact portion described later) of the rotation shaft 1 on the inner side surface 13 of the mounting hole 12. In this example, two pressure contact portions 16 are provided in a sharp shape side by side in the planar portion 14 of the mounting hole 12, and are formed on a ridge extending in the entire thickness direction of the rotating member 11. The pressure contact portion 16 is formed at the same height as the planar portion 14 of the rotating member 11.

Further, the planar portion 14 of the mounting hole 12 has a protrusion 17. The projecting portions 17 are formed as ridges extending in the entire thickness direction of the rotating member 11, and are provided one at each end of the planar portion 14 with the press contact portion 16 interposed therebetween. The two projecting portions 17 are formed at the same height as the planar portion 14 of the rotating member 11, the tip is formed in a flat shape, and is less likely to be plastically deformed than the press contact portion 16.
The pressure contact part 16 and the protrusion part 17 of this example are formed in the plane part 14 of the inner surface 13 of the mounting hole 12 as described above, and the pressure contact part 16 is formed higher than the protrusion part 17.

The protrusion 17 regulates the distance between the base end 16A of the pressure contact portion and the pressure contact portion of the rotation shaft 1 (the flat portion 1C that contacts the pressure contact portion 16) during the mounting of the rotation shaft 1 into the mounting hole 12.
Further, as shown in FIG. 2, the rotating shaft 1 is provided with a recess 1 </ b> D that does not come into contact with the pressure contact portion on the distal end side in the insertion direction of the flat portion 1 </ b> C. The dent 1D is preferably in a tapered shape with a narrow tip.

The outer shape of the insertion part 1A of the rotating shaft 1 and the inner side surface 13 of the mounting hole 12 have a slight clearance. Specifically, as shown in FIG. 4, the flat portion 14 of the mounting hole 12 is disposed opposite to the flat surface portion 1 </ b> C of the rotating shaft 1, and the curved surface portion 15 of the mounting hole 12 is opposed to the curved surface portion 1 </ b> B of the rotating shaft 1. The height between the upper end of the portion 15 and the tip 16B of the pressure contact portion (before plastic deformation) is L1, the height between the upper end of the curved portion 15 and the upper surface of the protrusion 17 is L3, the upper end of the curved portion 1B and the flat portion 1C Let L2 be the height of
L1 <L2 <L3
Have the relationship.

When the rotary shaft 1 is mounted in the mounting hole 12 in such a state, the distal end 16B of the pressure contact portion is plastically deformed by the flat surface portion 1C of the rotary shaft 1, and the flat surface portion 1C of the rotary shaft 1 becomes the pressure contact portion 16. Pressure welded,
The rotating shaft 1 is mounted and fitted in the mounting hole 12 at the approximate center of the insertion site 1A (see FIG. 3).

When the rotary shaft as in the conventional example is inserted into the mounting hole, the pressure contact portion is crushed by the distal end side in the insertion direction of the rotary shaft and plastically deformed. For this reason, if there is a sink at the time of molding of the rotary shaft at the approximate center of the insertion portion of the rotary shaft that is fastened by the press contact portion, the angle detection accuracy of the rotary shaft is reduced.
However, in this example, the rotation shaft is provided with a recess that does not come into contact with the pressure contact portion on the distal end side in the insertion direction of the flat surface portion. Therefore, since the pressure contact portion is not crushed by the rotation shaft until just before the rotation shaft is fixed in the mounting hole, there is a sink at the time of forming the rotation shaft at the approximate center of the insertion portion of the rotation shaft fixed by the pressure contact portion. Even in this case, the rotating shaft is securely fixed to the mounting hole, and the occurrence of fitting backlash is suppressed.

  In addition, even when the rotary shaft is tilted with respect to the mounting hole while the rotary shaft is being inserted into the mounting hole, a protrusion that extends in the entire thickness direction of the rotating member is provided on the inner surface of the mounting hole. Since the rotary shaft is fastened to the mounting hole in a state where it is immediately perpendicular to the hole and the rotary shaft is not inclined with respect to the mounting hole, the rotary shaft causes the pressure contact portion to be crushed against the insertion direction of the rotary shaft. It can be made uniform, and the axis perpendicularity between the rotating shaft and the mounting hole can be increased.

In addition, the projecting portion and the press contact portion of this example are formed in a flat portion, the press contact portion is formed higher than the projecting portion, and a plurality of projecting portions are formed with the press contact portion interposed therebetween, so that the rotation axis is left and right. When both rotations are made, the flat portion of the rotating shaft comes into contact with the protruding portion, so the rotating shaft does not crush the pressure contact portion more than necessary.
In this example, the protruding portion is formed with the press contact portion interposed therebetween. However, for example, one protruding portion may be provided at substantially the center of the flat portion so as to be sandwiched between the press contact portions, or the flat portion. One may be provided at the end. In this case, the shape of the inner surface of the mounting hole can be simplified and the manufacturing cost can be reduced as compared with the case where a plurality of protrusions are formed.

(Second Embodiment)
FIG. 5 shows a fitting structure between the rotating shaft 1G and the mounting hole 12 according to the second embodiment. FIG. 6 shows a rotating shaft 1G according to the second embodiment, (a) is a front view of the rotating shaft, and (b) is a bottom view of (a).
In the present embodiment, the difference from the first embodiment is that, in the first embodiment, the projecting portion 17 and the pressure contact portion 16 are provided in the flat portion 14, but in this example, the flat portion 14 is Only the pressure contact portion 16 is provided, and the projecting portion 17A is provided on the flat surface portion 1C opposed thereto.
Specifically, one protruding portion 17A is formed integrally with the rotating shaft 1G at the approximate center of the flat surface portion 1C of the rotating shaft 1G so as to be sandwiched between two press contact portions 16 provided to face the flat surface portion 1C. The pressure contact portion 16 is formed in the flat portion 14 and is higher than the protruding portion 17A provided on the flat portion 1C of the rotating shaft 1G.

The protrusion 17A regulates the distance between the base end 16A of the pressure contact portion and the pressure contact portion of the rotation shaft 1G (the flat surface portion 1C contacting the pressure contact portion 16) while the rotation shaft 1G is mounted in the mounting hole 12.
Further, as shown in FIG. 6, the rotation shaft 1G is provided with a recess 1E that does not come into contact with the pressure contact portion on the distal end side in the insertion direction of the flat surface portion 1C. The recess 1E is preferably tapered so that the tip is narrowed.

The outer shape of the rotating shaft 1G and the inner side surface 13 of the mounting hole 12 in this example have a slight clearance. Specifically, as shown in FIG. 5, the flat portion 14 of the mounting hole 12 is disposed opposite to the flat surface portion 1C of the rotating shaft 1G and the curved surface portion 15 of the mounting hole 12 is opposed to the curved surface portion 1B of the rotating shaft 1G. The height between the upper end of the portion 15 and the distal end 16B (before plastic deformation) of the press contact portion of the flat portion 14 is L4, the height between the upper end of the curved portion 15 and the base end 16A of the press contact portion is L7, and the upper end of the curved portion 1B. And the height of the flat surface portion 1C is L5, and the height of the upper end of the curved surface portion 1B and the tip of the protruding portion 17A is L6.
L4 <L5 <L6 <L7
Have the relationship.

  When the rotary shaft 1G is mounted in the mounting hole 12 in such a state, the distal end 16B of the press contact portion is plastically deformed by the flat portion 1C of the rotary shaft 1G, and the flat portion 1C of the rotary shaft 1G becomes the press contact portion 16. The rotary shaft 1G is press-contacted and fitted into the mounting hole 12 at the approximate center of the insertion portion 1A.

  Also in the present embodiment, the rotation shaft is provided with a recess not in contact with the pressure contact portion on the distal end side in the insertion direction of the flat surface portion, so that the pressure contact portion is the rotation shaft until just before the rotation shaft is fixed to the mounting hole. Therefore, even if there is a sink at the time of molding of the rotary shaft at the approximate center of the insertion portion of the rotary shaft that is fastened by the pressure contact portion, the rotary shaft is securely fastened to the mounting hole. Generation of fitting backlash is suppressed.

  In addition, even when the rotary shaft is tilted with respect to the mounting hole while the rotary shaft is being inserted into the mounting hole, the rotary shaft is provided with a protrusion formed from the tip in the insertion direction of the rotary shaft. Since the rotary shaft is fastened to the mounting hole in a state where it is immediately perpendicular to the hole and the rotary shaft is not inclined with respect to the mounting hole, the rotary shaft causes the pressure contact portion to be crushed against the insertion direction of the rotary shaft. It can be made uniform, and the axis perpendicularity between the rotating shaft and the mounting hole can be increased.

  The protrusions described above may be provided on both sides of the flat surface portion of the rotating shaft, and the pressure contact portions may be formed between the opposite protrusions. Even if it is such a shape, while having the same effect as the above-mentioned, when a rotating shaft rotates right and left, it can prevent reliably that the plane part of a rotating shaft crushes a press-contact part.

(Third embodiment)
FIG. 7 shows a fitting structure between the rotating shaft 1H and the mounting hole 12 according to the third embodiment. FIG. 8 shows a rotating shaft 1H according to the third embodiment, (a) is a front view of the rotating shaft, and (b) is a bottom view of (a).
In the present embodiment, the difference from the second embodiment is that a protrusion 17B provided on the flat surface portion 1C further protrudes, and a concave portion 14A that engages with the protrusion 17B is formed on the flat surface portion 14. .
Specifically, the inner shape of the recess 14A is formed substantially the same as the outer shape of the protrusion 17B, and the depth of the recess 14A is smaller than the height of the protrusion 17B.

  The protrusion 17B regulates the distance between the base end 16A of the pressure contact portion and the pressure contact portion of the rotation shaft 1H (the flat surface portion 1C contacting the pressure contact portion 16) during the mounting of the rotation shaft 1H into the mounting hole 12.

The outer shape of the rotating shaft 1H of this example and the inner side surface 13 of the mounting hole 12 have a slight clearance. Specifically, as shown in FIG. 7, the flat portion 14 of the mounting hole 12 is disposed opposite to the flat surface portion 1C of the rotating shaft 1H, and the curved surface portion 15 of the mounting hole 12 is opposed to the curved surface portion 1B of the rotating shaft 1H. The height between the upper end of the portion 15 and the tip 16B (before plastic deformation) of the press contact portion of the flat portion 14 is L8, the height between the upper end of the curved portion 15 and the base end 16A of the press contact portion is L10, and the upper end of the curved portion 15 And the height of the inner bottom of the recess 14A is L12, the height of the upper end of the curved surface portion 1B and the flat surface portion 1C is L9, and the height of the upper end of the curved surface portion 1B and the tip of the protruding portion 17B is L11.
L8 <L9 <L10 <L11 <12
Have the relationship.
Moreover, since the depth of the recess 14A is formed smaller than the height of the protrusion 17B,
(L12-L10) <(L11-L9)
Have the relationship.

  When the rotary shaft 1H is mounted in the mounting hole 12 in the state formed in this way, the tip 16B of the pressure contact portion is plastically deformed by the flat surface portion 1C of the rotation shaft 1H, and the flat surface portion 1C of the rotation shaft 1H becomes the pressure contact portion 16. The rotary shaft 1H is pressure-welded and is fitted and fitted into the mounting hole 12 at the approximate center of the insertion portion 1A.

  This embodiment has the same effect as the second embodiment, and the rotating shaft can be easily inserted into the mounting hole and the rotating shaft can be mounted by engaging the protrusion with the recess. After being inserted into the hole, when the rotation shaft rotates in the left-right direction, it is possible to more reliably suppress the occurrence of fitting play between the rotation member and the rotation shaft.

  Next, a mounting example of the rotation angle detector 10 of the above-described embodiment will be described. For example, FIG. 9 shows a motor actuator 21 provided with the rotation angle detector 10. The motor actuator 21 is used as a drive source for an airflow control valve of an air conditioner used in a vehicle such as an automobile. The upper and lower cases constituting the housing, the motor 24 disposed in the housing, and the shaft of the motor 24 A rotation gear connected to the rotation gear, a rotation shaft (output shaft) 1 that rotates in connection with the reduction gear, and a rotation angle detector 10 that is attached to the rotation shaft 1 and detects the rotation angle of the rotation shaft 1.

  The housing is formed in a box shape in which the opening ends of the upper case 22 and the lower case 23 are fitted to each other and have a predetermined internal space.

The motor 24 is disposed in the housing. A worm gear 24A is fixed to the shaft of the motor 24, and a reduction gear is connected to the worm gear 24A.
The reduction gear of this example has a first intermediate gear 25 and a second intermediate gear 26, the first intermediate gear 25 is connected to the worm gear 24 </ b> A, and the second intermediate gear 26 is connected to the first intermediate gear 25. The

  The rotating shaft 1 has a flange-shaped output gear 28 having a groove on the outer periphery, and the output gear 28 is connected to the second intermediate gear 26.

The upper end of the rotating shaft 1 is formed in a cylindrical shape, and is rotatably supported by projecting from a guide hole provided in the top plate of the upper case 22, and an air flow adjusting valve of an air adjusting device (not shown) is provided on the cylindrical inner periphery. The shaft is locked.
The lower end of the rotary shaft 1 is coaxial with the upper end of the rotary shaft 1 and is inserted into a bearing integrally provided on the inner bottom surface of the lower case 23 and is rotatably supported.

  In the motor actuator 21 of this example, the lower case 23 has an upright portion 27 formed of rising ribs having the same height on the inner side. The non-rotating member 18 of the potentiometer is supported by the upright portion 27.

  With the above configuration, the rotation of the shaft of the motor can be transmitted to the shaft of the air flow control valve of the air conditioner via the worm gear, the reduction gear, and the rotation shaft (output gear).

DESCRIPTION OF SYMBOLS 1 Rotation shaft 1A Insertion site 1B Curved surface portion 1C Plane portion 1D Depression 1E Depression 1G Rotation shaft 1H Rotation shaft 10 Rotation angle detector 11 Rotation member 12 Mounting hole 13 Inner side surface 14 Plane region
14A Concave portion 15 Curved surface portion 16 Pressure contact portion 16A Base end of pressure contact portion 16B Tip of pressure contact portion 17 Projection portion 17A Projection portion 17B Projection portion 18 Non-rotating member 19 Brush 21 Motor actuator 22 Upper case 23 Lower case 24 Motor 24A Warm gear 25 First Intermediate gear 26 Second intermediate gear 27 Upright portion 28 Output gear

Claims (7)

A rotation angle detector having a rotation shaft mounted in the mounting hole of the rotation member and having a fitting structure for transmitting the rotation motion of the rotation shaft to the rotation member,
The rotating member has a convex pressure contact portion for pressing the pressure contact portion of the rotating shaft on the inner surface of the mounting hole,
The inner surface or the rotation shaft is provided with a protrusion for regulating the distance between the base end of the pressure contact portion and the pressure contact portion of the rotation shaft,
The protruding portion extends in the entire thickness direction of the rotating member or is formed from the tip in the inserting direction of the rotating shaft,
The rotation angle detector according to claim 1, wherein the rotation shaft is provided with a dent not in contact with the pressure contact portion on a distal end side in the insertion direction. The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion and the protruding portion are formed in the planar portion,
The rotation angle detector according to claim 1, wherein the pressure contact portion is higher than the protruding portion.   The rotation angle detector according to claim 2, wherein a plurality of the protrusions are formed with the pressure contact part interposed therebetween. The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion is formed in the planar portion,
The protruding portion is formed on the flat portion,
The rotation angle detector according to claim 1, wherein the pressure contact portion is higher than the protruding portion.   The rotation angle detector according to claim 4, wherein the protruding portion is formed on the planar portion so as to be sandwiched between two pressure contact portions provided to face the planar portion. The rotating shaft is formed in a non-circular cross section having a flat surface portion,
The inner surface of the mounting hole is formed in a non-circular cross section having a planar portion facing the planar portion,
The pressure contact portion is formed in the planar portion,
The protruding portion is formed on the flat portion,
The planar portion is formed with a recess that engages with the protruding portion,
The rotation angle detector according to claim 1, wherein a depth of the concave portion is smaller than a height of the protruding portion. The motor actuator provided with the rotation angle detector of any one of Claim 1 thru | or 6.

Images