JP2020085780A - Attachment structure of steering angle sensor - Google Patents

Abstract

To provide a structure capable of reducing a dead zone, when a steering angle sensor is attached to a rotor such as a roll connector that rotates in conjunction with a steering.SOLUTION: A pair of elastic units 5a2 and 5b2 having elasticity are disposed at positions facing each other on a facing surface of one recess 21 formed in a rotation case 2b of a roll connector. A pair of projections 6a and 6b are integrally swollen and formed at the positions facing each other on the facing surface of the recess, and at the position on the tip side of a projection 31 on a main gear 3a in the state engaged with the recess. Thus, an engaged projection is grasped between the tips of the elastic units by an elastic force of both elastic units.SELECTED DRAWING: Figure 4

Description

The present invention relates to a steering angle sensor mounting structure for externally mounting a gear constituting a steering angle sensor to a rotating body that rotates in conjunction with a steering wheel.

BACKGROUND ART Conventionally, in vehicles such as automobiles, a steering angle sensor is attached to a roll connector that rotates in conjunction with the steering wheel in order to transmit the rotation of the steering wheel to a steering angle detection circuit (see Patent Document 1). ).

Here, the roll connector includes an annular fixed case and a rotating case rotatably provided inside thereof, and a steering wheel connected to the rotating shaft of the steering shaft is fitted into the rotating case of the roll connector. , The rotating case of the roll connector rotates in conjunction with the steering shaft (steering wheel). On the other hand, the ring-shaped main gear that constitutes the steering angle sensor is engaged with the rotation case of the roll connector, the rotation of the steering shaft is transmitted to the main gear, and one of the two sub gears housed in the fixed case of the roll connector. Is engaged with the main gear and rotates in conjunction with the main gear. The rotation of one of the sub gears is transmitted to the other sub gear, and the rotation of the steering shaft (steering wheel) is based on the rotation of both sub gears. The angle is detected by the steering angle detection circuit. The two sub gears may be in mesh with each other without meshing with each other.

And, the engagement portion of the rotation case of the roll connector and the main gear of the steering angle sensor is mounted with a ring-shaped main gear from the outside of the rotation case, and for example, a plurality of recesses formed on the rear end surface of the rotation case of the roll connector. A plurality of convex portions formed on the inner circumference of the main gear of the steering angle sensor are engaged with each of them.

JP, 2005-108592, A (refer paragraphs 0018-0021, Drawing 3, and Drawing 4).

However, in the case of the structure for mounting the rudder angle sensor on the roll connector described above, in order to transmit the rotation of the roll case of the roll connector to the main gear and the sub gear of the rudder angle sensor, the recess on the roll case side of the roll connector and the rudder angle sensor are transmitted. Since a required play is provided between the main gear of the steering wheel and the main gear of the steering angle sensor and the sub gear meshing with the main gear of the steering angle sensor, even if the steering wheel rotates, There is a so-called "dead zone" in which rotation is not transmitted to the rudder angle detection circuit, and this dead zone is also caused by eccentricity when the rotating case and the main gear of the rudder angle sensor are assembled. Since it becomes a problem in performing the vehicle control using the steering angle detection value with high accuracy, it is required to keep the dead zone as small as possible.

It is an object of the present invention to provide a structure capable of reducing a dead zone when a steering angle sensor is attached to a rotating body such as a roll connector which rotates in association with steering.

In order to achieve the above object, the rudder angle sensor mounting structure of the present invention is a rudder angle sensor for externally mounting a gear constituting the rudder angle sensor to a rotating body that rotates in conjunction with a steering wheel. In the mounting structure of, the rotating body side fitting portion formed of any one of a convex portion and a concave portion formed on the rotating body, and the rotating body side fitting portion of the rotating body formed on the gear of the steering angle sensor. A sensor-side fitting portion formed of the other one of the concave portion and the convex portion to be fitted, and one of the rotating body-side fitting portion and the sensor-side fitting portion that is formed of the concave portion is a gap between the facing surfaces of the concave portion. Is formed wider than the width of one of the rotary body side fitting portion and the sensor side fitting portion formed of a convex portion, and has a pair of elastic members provided at positions facing each other of the facing surfaces of the concave portion. An elastic part and a pair of projecting parts that are integrally bulged at positions facing each other of the facing surfaces of the concave part, and at positions on the tip end side of the convex part when fitted in the concave part. The intervals between the tips of the protrusions are formed to be wider than the width of the protrusions, and the intervals between the elastic portions are narrower than the width of the protrusions toward the ends. It is characterized in that an elastic portion is formed.

With such a configuration, when the convex portion of the rotating body side fitting portion and the sensor side fitting portion fits between the pair of elastic portions having elasticity, both elastic portions are deformed so that both of the elastic portions are deformed. The tip of the elastic part expands, the convex part fits between both elastic parts, and the elastic force of both elastic parts keeps the fitted convex part sandwiched between the ends of both elastic parts. It is held by both elastic parts.

Therefore, when the sensor-side fitting portion is fitted to the rotating-body-side fitting portion, the convex portions of the rotating-body-side fitting portion and the sensor-side fitting portion are elastically deformed by the elastic force of both elastic portions. It is held in a state of being sandwiched by being sandwiched, and when the steering wheel rotates, the rotation can be reliably transmitted to the steering angle detection circuit, and even if the steering wheel rotates, the rotation is detected by the steering angle detection circuit. It is possible to reduce the dead zone that is not transmitted to the vehicle and improve the control accuracy when the vehicle control is performed using the steering angle detection value.

In addition, the distance between the tips of the protrusions formed on the facing surface of the concave portion, which is the concave portion of the rotating body-side fitting portion and the sensor-side fitting portion, is equal to that of the rotating body-side fitting portion and the sensor-side fitting portion. Since the width is larger than the width of one of the protrusions, even if one or both of the blades is damaged, when the steering wheel rotates, the protrusion contacts one of the protrusions and the steering wheel Therefore, the situation where the rotation angle of the steering wheel cannot be detected can be prevented in advance.

Further, the distance between the elastic portions is set so as to become narrower than the width of the convex portion toward the both protruding portions located on the tip side of the convex portion of the rotating body side fitting portion and the sensor side fitting portion. Since the elastic part is formed, when fitting the rotating body side fitting part and the sensor side fitting part, it is possible to guide the convex part toward the tip end where the gap between both elastic parts is narrowed, and the fitting operation can be performed. The work can be done easily.

Further, the rudder angle sensor mounting structure of the present invention is the rudder angle sensor mounting structure for externally mounting a gear constituting the rudder angle sensor on a rotating body that rotates in conjunction with a steering wheel, wherein: A rotating body side fitting portion formed of one of a convex portion and a concave portion formed on the body, and a concave portion or a convex portion formed on the gear of the steering angle sensor and fitted to the rotating body side fitting portion of the rotating body. The sensor-side fitting portion made of the other one of the above, and the one of the rotating-body-side fitting portion and the sensor-side fitting portion that is formed of a recess is such that the interval between the facing surfaces of the recess is the rotor-side fitting portion. Of the base portion and the sensor-side fitting portion, the pair of base portions being formed to be wider than the width of the convex portion and integrally bulging at positions facing each other of the facing surfaces of the recessed portion, and the both base portions. A pair of elastic portions integrally provided at each tip is provided, and the distance between the tips of the both bases is formed wider than the width of the convex portion. It is preferable that the width becomes smaller than the width of the convex portion as it goes to.

According to such a configuration, when the convex portion of the rotating body side fitting portion and the sensor side fitting portion fits between the pair of elastic portions, both elastic portions are deformed, so that The tip of the elastic part expands, the convex part of the rotating part side fitting part and the sensor side fitting part fits between both elastic parts, and the elastic force of both elastic parts causes both elastic parts to fit into the fitted convex part. Keeps contacting, and the protruding part that is fitted is held by both elastic parts, so when the sensor side fitting part is fitted to the rotating body side fitting part, the spring force of both elastic parts With this, it is possible to hold the convex portion of the rotating body side fitting portion and the sensor side fitting portion in a fitted state, and to reliably transmit the rotation to the steering angle detection circuit when the steering wheel rotates. Therefore, the dead zone can be reduced, and the control accuracy when performing vehicle control using the steering angle detection value can be improved.

In addition, a pair of bases are integrally formed so as to bulge at positions facing each other of the facing surfaces of the convex portion of the rotor-side fitting portion and the sensor-side fitting portion. Since it is formed wider than the width of the convex portion of the body-side fitting portion and the sensor-side fitting portion, one or both of the pair of elastic portions integrally provided at the tips of both base portions and having elasticity. Even if it is damaged, when the steering wheel rotates, the convex part will contact one of the bases and the rotation of the steering wheel will be transmitted, preventing the situation where the rotation angle of the steering wheel cannot be detected. It becomes possible to do.

According to the present invention, when the sensor-side fitting portion is fitted to the rotating-body-side fitting portion, the protrusions of the rotating-body-side fitting portion and the sensor-side fitting portion are generated by the elastic forces of both elastic portions. Can be retained in a state of being sandwiched between both elastic portions by being fitted in the recessed portion, so that even if the steering wheel rotates, the dead zone in which the rotation is not transmitted to the steering angle detection circuit can be reduced. As a result, when the steering wheel rotates, the rotation can be reliably transmitted to the steering angle detection circuit, and it is possible to improve the control accuracy when performing vehicle control using the steering angle detection value. Become.

It is an exploded perspective view of a first embodiment of a mounting structure of a steering angle sensor of the present invention. It is a front view of a part of steering angle sensor of FIG. Part of the steering angle sensor of FIG. 1 is shown, (a) is a front view and (b) is a bottom view. FIG. 2 is a bottom view of a part of FIG. 1 before fitting. It is a bottom view of a certain state after fitting a part of FIG. It is a bottom view of a state different from FIG. It is a bottom view before a part of fitting of a 2nd embodiment of the present invention. It is a bottom view of a certain state after fitting a part of FIG.

<First Embodiment>
A first embodiment of a steering angle sensor mounting structure according to the present invention will be described in detail with reference to FIGS. 1 to 6.

As shown in FIG. 1, the steering angle sensor mounting structure of the present embodiment is a roll connector that is a rotating body that rotates in conjunction with the steering wheel 1 in order to transmit the rotation of the steering wheel 1 to a steering angle detection circuit. The rudder angle sensor 3 is attached to 2.

The roll connector 2 includes an annular fixed case 2a and a rotating case 2b having a cylindrical portion rotatably provided on the inner peripheral side of the fixed case 2a, and the steering wheel 1 is connected to a rotating shaft of a steering shaft. Is fitted to the rotation case 2b of the roll connector 2, the rotation case 2b of the roll connector 2 rotates in conjunction with the steering shaft (steering wheel 1).

As shown in FIG. 2, the steering angle sensor 3 meshes with a ring-shaped main gear 3a, a first subgear 3b that meshes with the main gear 3a and has a smaller diameter than the main gear 3a, and a smaller diameter than the main gear 3a with the first subgear 3b. The second sub gear 3c is provided.

Then, the main gear 3a is engaged with the rotation case 2b of the roll connector 2, the rotation of the steering shaft is transmitted to the main gear 3a, the first sub gear 3b rotates in conjunction with the main gear 3a, and the rotation of the first sub gear 3b rotates. Is transmitted to the second sub gear 3c, and the rotation angle of the steering shaft, that is, the steering wheel 1 is detected by the steering angle detection circuit based on the rotation of both the sub gears 3b and 3c. The first and second sub gears 3b and 3c may not mesh with each other, and the sub gears 3b and 3c may mesh with the main gear 3a.

By the way, as described above, the main gear 3a of the rudder angle sensor 3 is attached by engaging with the rotating case 2b of the roll connector 2, and the mounting structure thereof is the rotor side formed on the rotating case 2b side of the roll connector 2. A combination of a concave portion as a fitting portion and a convex portion as a sensor side fitting portion formed on the main gear 3a side of the steering angle sensor 3 is adopted.

Specifically, as shown in FIG. 2, two protrusions 31 and 32 project toward the center on the inner circumference of the main gear 3a of the steering angle sensor 3 at two opposite positions that are offset by 180°. As shown in FIG. 3, two recesses 21 and 22 are formed on the rear end surface of the rotating case 2b of the roll connector 2 facing each other and shifted by 180°. The convex portion 31 of the main gear 3a is fitted into the concave portion 21 of the rotating case 2b, and the convex portion 32 of the main gear 3a is fitted into the concave portion 22 of the rotating case 2b. The convex portions 31 and 32 are preferably rectangular parallelepipeds as shown in FIGS. 3 and 4, but are not limited to rectangular parallelepiped shapes.

At this time, in the convex portions 31 and 32 on the main gear 3a side, as shown in FIG. 2, the convex portion 32 on the other side is formed wider than the concave portion 21 on one side in a front view, and the concave portions 21 and 22 on the rotating case 2b side are formed. Are formed to have substantially the same width when viewed from the front, and the other recess 22 on the side of the rotating case 2b is formed to be slightly wider than the other projection 32 on the side of the main gear 3a when viewed from the front. The interval between the facing surfaces of the one concave portion 21 on the 2b side is formed to be wider than the width of the one convex portion 31 on the main gear 3a side in a front view, like the concave portion 22.

As shown in FIG. 3, one of the recesses 21 on the side of the rotating case 2b has a base portion 5a1, which is a root portion of the pair of engaging pieces 5a, 5b, at positions facing each other on the facing surfaces of the recess portion 21, respectively. 5b1 is integrally implanted, and elastic portions 5a2 and 5b2 at the tips having elasticity of the engaging pieces 5a and 5b are formed in the base portions 5a1 and 5b1 so as to form an inverted V shape. A pair of protrusions 6a and 6b are integrally formed to bulge at the positions facing each other and at the tip end side of the protrusion 31 on the main gear 3a side in the fitted state.

Further, the interval w1 between the tips of the both protruding portions 6a and 6b is formed wider than the width w2 of the one protruding portion 31 on the main gear 3a side in a front view, and the elastic portions 5a2 and 5b2 of the respective engaging pieces 5a and 5b. Is formed integrally with each of the base portions 5a1 and 5b1 so as to become narrower toward the front and form a V shape. The distance between the tips of the elastic portions 5a2, 5b2 of the engagement pieces 5a, 5b is narrower than the width w2 of the convex portion 31 on the main gear 3a side in the fitted state in a front view.

Thus, when the convex portion 31 of the main gear 3a of the steering angle sensor 3 is fitted between the pair of engagement pieces 5a and 5b, the elastic portions 5a2 and 5b2 at the tips of both engagement pieces 5a and 5b are drawn. The state of the one-dot chain line in 5 is deformed to the state of the solid line, whereby the space between both elastic portions 5a2 and 5b2 becomes wider than the width w2 of the convex portion 31, and the convex portion 31 of the main gear 3a displaces both elastic portions 5a2 and 5b2. Push it apart and fit it between the elastic parts 5a2 and 5b2. Then, due to the elastic force of both the elastic portions 5a2 and 5b2, the fitted convex portion 31 continues to be sandwiched between the both elastic portions 5a2 and 5b2, and the convex portion 31 does not cause a positional displacement and the both elastic portions 5a2 and 5b2. Held between 5b2.

Then, since the convex portion 31 is sandwiched between the elastic portions 5a2 and 5b2 at the tips of both the engaging pieces 5a and 5b, when the steering wheel 1 rotates, the steering angle sensor 3 causes the steering angle detection circuit to perform steering. The rotation of the wheel 1 can be reliably transmitted, and even if the steering wheel 1 rotates, it is possible to reduce the dead zone in which the rotation is not transmitted to the steering angle detection circuit. It is possible to improve control accuracy when performing control.

In addition, as shown in FIG. 4, the distance w1 between the tips of the protrusions 6a and 6b formed in the one recess 21 is wider than the width w2 (<w1) of the protrusion 31 on the main gear 3a side in a front view. Since it is formed, as shown in FIG. 6, when the steering wheel 1 rotates while the elastic portion 5a2 of one of the engagement pieces 5a and 5b is damaged so as to be separated from the base portion 5a1, the protrusion is formed. Since the portion 31 comes into contact with the one protruding portion 6a with almost no play, the rotation of the steering wheel 1 is continuously transmitted to the steering angle sensor 3 side, and the situation in which the rotation angle of the steering wheel 1 cannot be detected is prevented. To be done.

Further, since the elastic portions 5a2, 5b2 are formed such that the distance between the elastic portions 5a2, 5b2 of the engaging pieces 5a, 5b becomes narrower toward the tip, the rotary case 2b and the main gear 3a are fitted together. When mating, as shown by the thick arrow in FIG. 4, the convex portion 31 can be guided toward the distal ends of the elastic portions 5a2 and 5b2, and the fitting operation can be easily performed.

Therefore, according to the above-described first embodiment, when the convex portion 31 of the main gear 3a of the steering angle sensor 3 which is the sensor side fitting portion is fitted into the concave portion 21 which is the rotating body side fitting portion, Since the convex portion 31 can be fitted into the concave portion 21 and held between the elastic portions 5a2 and 5b2 by the elastic force of the elastic portions 5a2 and 5b2, even if the steering wheel 1 rotates, The dead zone in which the rotation is not transmitted to the steering angle detection circuit can be reduced, and when the steering wheel 1 rotates, the rotation of the steering wheel 1 can be reliably transmitted to the steering angle detection circuit via the steering angle sensor 3. This makes it possible to improve the control accuracy when performing vehicle control using the detected steering angle value.

Further, since the distance w1 between the tips of the protrusions 6a and 6b formed in the recess 21 is wider than the width w2 (<w1) of the protrusion 31 on the main gear 3a side, when the protrusion 31 is fitted, The amount of deflection of both elastic portions 5a2, 5b2 can be limited to the extent that both elastic portions 5a2, 5b2 are not damaged, and for example, one elastic portion 5a2 of both engaging pieces 5a, 5b is separated from the base portion 5a1. Even if the steering wheel 1 is damaged as described above, when the steering wheel 1 rotates, the convex portion 31 contacts the one protruding portion 6a without play, and the rotation of the steering wheel 1 is continuously transmitted. It is possible to prevent an unexpected situation that cannot be detected.

Further, since the distance between the elastic portions 5a2, 5b2 at the tips of the engaging pieces 5a, 5b becomes narrower toward the tips, when the rotating case 2b and the main gear 3a are fitted, the main gear 3a side is fitted. Since the convex portion 31 can be guided toward the distal ends of the elastic portions 5a2 and 5b2 inside the concave portion 31, the fitting operation between the rotating case 2b and the main gear 3a can be easily performed.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. 7 and 8, the same reference numerals as those in the above-described first embodiment indicate the same or corresponding ones, and the points different from the first embodiment will be mainly described below.

In the second embodiment, as shown in FIG. 7, the protrusions 6a and 6b are not formed in the recess 21 of the rotating case 2b, and the bases 5a1 and 5b1 and the bases 5a1 and 5b1 are integrally formed continuously. The engaging pieces 5a and 5b having the elastic portions 5a2 and 5b2 having the elastic elasticity are provided at the positions facing each other on the facing surfaces of the recess 21, which is different from the above-described first embodiment.

At this time, the interval w3 between the tips of the bases 5a1 and 5b1 of the engagement pieces 5a and 5b is formed wider than the width w2 (<w3) of the convex portion 31 on the main gear 3a side in a front view. The elastic portions 5a2, 5b2 are formed such that the interval between the tips of the elastic portions 5a2, 5b2 having elasticity of 5b is smaller than the width w2 of the convex portion 31 in front view.

Even if the protruding portions 6a and 6b are not provided, as shown in FIG. 8, for example, when one elastic portion 5a2 of the both engaging pieces 5a and 5b is damaged so as to be separated from the base portion 5a1, the steering wheel is damaged. When 1 rotates, the convex portion 31 contacts the tip of the base portion 5a1 of the one engagement piece 5a, so that the rotation of the steering wheel 1 can be continuously transmitted to the steering angle sensor 3 side. Here, in case the elastic portions 5a2, 5b2 at the tips of the engaging pieces 5a, 5b are damaged, the base portions 5a1, 5b1 are formed thicker and stronger than in the first embodiment in which the protruding portions 6a, 6b are formed. It is desirable to keep it.

Further, since the elastic portions 5a2, 5b2 are formed such that the distance between the elastic portions 5a2, 5b2 at the tips of the engaging pieces 5a, 5b becomes narrower toward the tips, the rotating case 2b and the main gear 3a are When they are fitted together, as shown by the thick arrow in FIG. 7, the convex portion 31 can be guided toward the tip ends of the elastic portions 5a2 and 5b2.

Therefore, according to the second embodiment described above, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention. For example, the rotating body is not limited to the roll connector 2 described above.

Further, in the above-described embodiment, an example has been described in which the two concave portions 21 and 22 and the two convex portions 31 and 32 are formed at the opposite positions of the rotating case 2b and the main gear 3a that are offset by 180°, respectively. The formation positions of the concave portions 21 and 22 and the convex portions 31 and 32 do not necessarily need to be shifted by 180° and may be formed at different positions.

Further, in the above-described embodiment, the engaging pieces 5a and 5b having the elastic portions 5a2 and 5b2 may be formed in both of the two recesses 21 and 22. Further, three or more recesses similar to the recesses 21 having the elastic portions 5a2 and 5b2 may be formed in the rotating case 2b.

Further, in the above-described embodiment, the elastic portions 5a2 and 5b2 are described as having a V-shape, but they may be formed in a V shape or an arc shape, respectively. The shape may be such that the gap is the narrowest in the middle of 5a2 and 5b2 and the gap is narrower than the width w2 of the convex portion 31 in front view, and the tips of the elastic portions 5a2 and 5b2 are connected to the inner surface of the concave portion 21. Thus, the elastic portions 5 and 2 and 5b2 may be formed.

Further, in the above-described first embodiment, the engagement pieces 5a and 5b may be configured to include only the elastic portions 5a2 and 5b2 without the base portions 5a1 and 5b1.

Further, in the above-described embodiment, the case where the concave portion is formed in the rotating case 2b and the convex portion is formed in the main gear 3a of the steering angle sensor 3 has been described, but the convex portion is formed in the rotating case 2b and the main gear of the steering angle sensor 3 is described. You may form a recessed part in 3a.

Further, the present invention can be applied to a portion where the steering angle sensor is attached to the rotating body that rotates in conjunction with the steering wheel.

1... Steering wheel 2... Roll connector (rotating body)
21... Recessed portion (rotating body side fitting portion)
3... Rudder angle sensor 3a... Main gear 31... Convex part (sensor-side fitting part)
5a1, 5b1... Base part 5a2, 5b2... Elastic part 6a, 6b... Projection part

Claims (2)

In a mounting structure of a rudder angle sensor for externally fitting and mounting a gear constituting a rudder angle sensor to a rotating body that rotates in conjunction with a steering wheel,
A rotating body side fitting portion formed of one of a convex portion and a concave portion formed on the rotating body,
A sensor-side fitting portion formed of the other of the concave portion or the convex portion that is formed in the gear of the steering angle sensor and that fits with the rotating-body-side fitting portion of the rotating body,
One of the rotating body-side fitting portion and the sensor-side fitting portion that is formed of the concave portion is
The interval between the facing surfaces of the concave portion is formed to be wider than the width of the convex portion of the rotating body side fitting portion and the sensor side fitting portion,
A pair of elastic portions having elasticity provided at positions facing each other of the facing surfaces of the recess,
At a position facing each other of the facing surface of the recess, a pair of protrusions integrally bulged at a position on the tip side of the protrusion in a state of being fitted into the recess,
The distance between the tips of the both protrusions is formed wider than the width of the protrusion,
The rudder angle sensor mounting structure, wherein the elastic portions are formed such that a distance between the elastic portions becomes narrower toward a tip end than a width of the convex portion. In a mounting structure of a rudder angle sensor for externally fitting and mounting a gear constituting a rudder angle sensor to a rotating body that rotates in conjunction with a steering wheel,
A rotating body side fitting portion formed of one of a convex portion and a concave portion formed on the rotating body,
A sensor-side fitting portion formed of the other of the concave portion or the convex portion that is formed in the gear of the steering angle sensor and that fits with the rotating-body-side fitting portion of the rotating body,
One of the rotating body-side fitting portion and the sensor-side fitting portion that is formed of the concave portion is
The interval between the facing surfaces of the concave portion is formed to be wider than the width of the convex portion of the rotating body side fitting portion and the sensor side fitting portion,
A pair of bases integrally formed to bulge at the positions facing each other of the facing surfaces of the recess,
A pair of elastic portions having elasticity integrally provided at the distal ends of both the base portions,
The distance between the tips of the bases is wider than the width of the protrusion, and the distance between the elastic portions is smaller than the width of the protrusions toward the tip. Steering angle sensor mounting structure.

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