JPH10213426A - Vibration-sound preventing structure of steering angel sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibrating-sound preventing structure, which prevents the occurrence of the rattling sounds by the vibration of the slit plate in a steering angle sensor. SOLUTION: A steering angle sensor has the following parts. A slit plate 31 has a tube body 33, which is penetrated through a steering shaft so that the relative rotation is not performed. A cylindrical slit-plate containing part 41 contains a tube body 33 of this slit plate 31 so that the part 33 is freely rotatable at the same axis and has a pair of flange-shaped sliding parts 43. In this steering angle sensor, at least one edge of the tube part 33 is formed on a curved surface 45. The sliding surface of the sliding part 43 facing the edge is formed of a slant surface 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering angle sensor used for controlling a damping force of a shock absorber, and more particularly, to a structure for preventing a vibration sound of a slit plate rotatably built in a main body case. It is.

[0002]

2. Description of the Related Art A centrifugal force is applied to a turning car.
Rotational movement (roll) about the vehicle longitudinal axis occurs. In recent years, there has been proposed a shock absorber damping force control in which the rigidity of a shock absorber is optimally distributed to such a roll and the roll is suppressed to ensure stability during steering. This damping force control controls the oil flow rate passing through the orifice inside the shock absorber when the relationship between the steering angle and the vehicle speed becomes a constant value, obtains an appropriate damping force, and increases the rigidity of each shock absorber. Is optimally distributed. Therefore, in order to perform such control, a steering angle sensor that detects a steering angle is required.

As shown in FIGS. 9 and 10, a steering angle sensor 1 includes a slit plate 3 mounted on a steering shaft and rotating, a light emitting element 5 and a light receiving element 7 sandwiching the slit plate 3, a light emitting element, A sensor housing 9 that houses the light receiving element 5 and the light receiving element 7, and a pair of body cases 13 a and 13 b that rotatably hold the slit plate 3 and house the sensor housing 9.

[0004] The steering angle sensor 1 thus configured is
When the steering shaft rotates, the slit plate 3 rotates in the main body cases 13a and 13b, and the light receiving element 7 generates a pulse at each steering angle in accordance with the transmission or cutoff of light by the slit plate 3, and this is signaled. The rotation angle, the rotation direction, and the angular velocity are detected by the processing circuit through arithmetic processing, and are sent to an absorber control (ECU) or the like.

[0005]

The steering angle sensor 1 described above.
The slit plate 3 has a cylindrical body 17 which is open and closed at the center of an annular plate formed with a slit hole 15 and is formed concentrically, and this cylindrical body 17 is inserted into the outer periphery of the steering shaft so as not to rotate relatively. I do. The main body cases 13a and 13b are formed with a cylindrical slit plate housing portion 19, and the slit plate housing portion 19 rotatably houses the cylindrical body portion 17 coaxially. Therefore, in the steering angle sensor 1, when the steering shaft rotates, the slit plate 3 rotates together with the steering shaft, and the cylindrical body 17 is moved to the slit plate housing 19.
Will rotate within. However, at this time, a sound due to vibration (hereinafter, referred to as “backlash sound”) is generated between the cylindrical body portion 17 and the slit plate housing portion 19. This rattling noise is caused by the vibration, and as shown in FIG. 11, the cylindrical body portion 17 is moved in the axial direction of the steering shaft so that the sliding portion 2 of the slit plate housing portion 19 moves.
This is caused by hitting 1. For this reason, in the related art, rattling noise has been reduced by applying grease to the sliding portion 21, but grease flows out during continuous use (rotation) and lacks durability as a countermeasure against rattling noise. There was a problem. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration sound preventing structure capable of preventing the occurrence of rattling due to the vibration of a slit plate by structurally suppressing the vibration of the slit plate. Is what you do.

[0006]

A vibration sound preventing structure according to the present invention for achieving the above object has a slit plate having a cylindrical portion which is inserted into a steering shaft so as not to be able to rotate relative to the steering shaft. A steering angle sensor comprising: a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces of the cylindrical body portion for rotatably housing the cylindrical body portion. At least one end surface of the body portion is formed as a curved surface, and a sliding surface of the sliding portion facing the end surface is formed as an inclined surface. The vibration sound preventing structure is provided with a slit plate having a cylindrical body part that is inserted into the steering shaft so as to be relatively non-rotatable, and accommodates the cylindrical body part of the slit plate coaxially and rotatably, and In a steering angle sensor including a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces, an outer diameter of at least one end of the cylindrical portion gradually increases toward a tip. Formed with a tapered surface that becomes smaller,
The sliding surface of the sliding portion facing the end may be formed as a curved surface. In addition, the vibration sound preventing structure includes a slit plate having a tubular portion that is inserted into the steering shaft so as to be relatively non-rotatable, and accommodates the tubular portion of the slit plate coaxially and rotatably, and A steering angle sensor comprising a cylindrical slit plate housing having a pair of flange-shaped sliding portions opposed to both end faces, wherein a projection opposed to the sliding portion is provided on at least one end face of the cylindrical body. More than one may be provided in the circumferential direction. Further, the vibration sound preventing structure is provided with a slit plate having a cylindrical portion that is inserted into the steering shaft so as to be relatively non-rotatable, and accommodates the cylindrical portion of the slit plate rotatably coaxially, A steering angle sensor having a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces, wherein at least one of the sliding portions has a projection opposed to an end surface of the cylindrical body portion. More than one may be provided in the circumferential direction. In addition, the vibration sound preventing structure includes a slit plate having a tubular portion that is inserted into the steering shaft so as to be relatively non-rotatable, and accommodates the tubular portion of the slit plate coaxially and rotatably, and A steering angle sensor including a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces, wherein a base end is connected to the sliding portion and a distal end is a free end; At least one of the sliding portions may be provided with three or more elastic portions extending in the circumferential direction of the moving portion and having the free end facing the end surface of the cylindrical portion in the circumferential direction. In addition, the vibration sound preventing structure includes a slit plate having a tubular portion that is inserted into the steering shaft so as to be relatively non-rotatable, and accommodates the tubular portion of the slit plate coaxially and rotatably, and A steering angle sensor including a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces, wherein a base end is connected to the sliding portion and a distal end is a free end; At least one of the sliding portions may be provided with three or more elastic portions extending in the radial direction of the moving portion and having the free end facing the end surface of the cylindrical body portion in the circumferential direction.

In this vibration sound preventing structure, at least one end face of the cylindrical body is formed as a curved surface, and the sliding surface of the sliding portion facing the end surface is formed as an inclined surface, so that the collision at the sliding portion is achieved. The area becomes smaller. At least one end of the cylindrical portion is formed with a tapered surface whose outer diameter gradually decreases toward the tip, and the sliding surface of the sliding portion facing this end is formed with a curved surface. In the structure, as described above, the collision area is reduced, and the center of rotation of the cylindrical body can be restricted to the center of the slit plate housing. Further, in the vibration noise prevention structure in which the projection facing the sliding portion is provided on at least one end surface of the cylindrical portion, the cylindrical portion makes point contact with the sliding portion via the projection, and the collision area in the sliding portion is reduced. Becomes smaller. Further, in the vibration sound preventing structure in which the projection facing the end face of the cylindrical body is provided on at least one of the sliding sections, the sliding section comes into point contact with the end face of the cylindrical section via the projection, and the sliding is performed as described above. The collision area in the moving part is reduced, and a large projection can be formed.
In addition, in the vibration noise prevention structure in which the elastic portion extending in the circumferential direction of the sliding portion is provided on the sliding portion, when the cylindrical portion tries to vibrate in the axial direction of the steering shaft, the end surface of the cylindrical portion becomes the elastic portion. They collide and the impact is absorbed by the elastic part. Since the elastic portion protrudes in the sliding direction of the cylindrical portion, the frictional resistance at the time of contact of the elastic portion is reduced. In the vibration sound preventing structure in which the elastic portion extending in the radial direction of the sliding portion is provided on the sliding portion, the end surface of the cylindrical portion collides with the elastic portion, and the elastic portion absorbs the impact.
Since the elastic portion protrudes in the radial direction of the sliding portion, the space for forming the elastic portion is reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the vibration sound preventing structure according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a slit plate and a slit plate accommodating portion showing a first embodiment of the vibration sound preventing structure of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the vibration sound preventing structure of the present invention. The slit plate 31 is composed of a cylindrical tubular body 33 and a plurality of slits 35 in the circumferential direction, and an annular plate 37 provided concentrically around the outer periphery of the tubular body 33. . The slit plate 31 rotates together with the steering shaft by inserting the cylindrical body portion 33 into a steering shaft (not shown) so as not to rotate relatively.

On the other hand, the main body case 39 of the steering angle sensor has a cylindrical slit plate receiving portion 41 formed therein. The slit plate receiving portion 41 accommodates the cylindrical portion 33 of the slit plate 31 coaxially and rotatably. I do. The main body case 39 and the slit plate housing 41 are divided into an upper main body case 39a and a lower main body case 39b in a plane orthogonal to the axis of the steering shaft.

At both ends in the axial direction of the slit plate housing portion 41,
A pair of flange-shaped sliding portions 43 projecting from the inner peripheral surface in a plane direction perpendicular to the axis of the steering shaft are formed. The sliding portion 43 is slidably opposed to both end surfaces of the cylindrical body portion 33. That is, the axial movement of the slit plate 31 is restricted by the contact of the two end surfaces of the cylindrical body portion 33 with the sliding portion 43.

As shown in FIG. 2, at least one end surface of the cylindrical portion 33 (in the illustrated example, the lower end of the cylindrical portion 33).
Is formed by a curved surface 45. The sliding surface of the sliding portion 43 facing the curved surface 45 is formed by an inclined surface 47. In the illustrated example, the inclined surface 47 whose thickness gradually decreases in the direction of the rotation center is formed on the sliding surface, but the inclined surface may be the opposite inclined surface.

According to the vibration sound preventing structure configured as described above, the collision area at the sliding portion is reduced, and the rattling sound due to the vibration when the slit plate is rotated can be reduced.
Further, by forming the sliding portion 43 with the inclined surface 47,
The center of rotation of the cylindrical portion 33 can be regulated so as to coincide with the center of the slit plate housing portion 41, and rattling noise caused by collision between the outer periphery of the cylindrical body portion 33 and the inner periphery of the slit plate housing portion 41 can be reduced. it can.

In the vibration sound preventing structure according to the first embodiment described above, a case where a curved surface 45 is provided at the lower end of the cylindrical body portion 33 and an inclined surface 47 is provided at the sliding portion 43 of the lower body case 39b will be described. However, the curved surface 45 and the inclined surface 47 also include the sliding portion 43 of the upper end of the cylindrical body portion 33 and the upper body case 39a,
Alternatively, the upper and lower ends of the cylindrical body portion 33 and the upper and lower body cases 39a,
It may be provided on the sliding portion 43 of the 39b.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the vibration sound preventing structure of the present invention. The vibration sound preventing structure according to this embodiment includes a tapered surface 51 whose outer diameter gradually decreases toward at least one end (the lower end side of the cylindrical body 33 in the illustrated example) of the cylindrical body 33 toward the distal end. It is formed. Also, the sliding surface of the sliding portion 43 facing this end is
It is formed by a curved surface 53. In the curved surface 53 according to this example, the distal end surface on the inner diameter side of the sliding portion 43 is formed as a curved surface.

According to the vibration sound preventing structure configured as described above, as in the first embodiment, the collision area at the sliding portion is reduced, and rattling due to vibration when the slit plate is rotated can be reduced. The cylindrical portion 3 of the tapered surface 51
3 can be inserted into the inner diameter side of the sliding portion 43, so that the center of rotation of the cylindrical body portion 33 can be more reliably restricted to the center of the slit plate housing portion 41, and the outer periphery of the cylindrical body portion 33 and the slit plate It is possible to reduce rattling due to collision with the inner periphery of the housing 41.

In the vibration sound preventing structure according to the second embodiment described above, a case is described in which a tapered surface 51 is provided at the lower end of the cylindrical body 33 and a curved surface 53 is provided on the sliding portion 43 of the lower body case 39b. However, the tapered surface 51 and the curved surface 53 are also formed by the upper end of the cylindrical body portion 33 and the sliding portion 43 of the upper body case 39a, or the upper and lower ends of the cylindrical body portion 33 and the upper and lower body case 3
It may be provided on the sliding portions 43 of 9a and 39b.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the vibration sound preventing structure of the present invention. In the vibration noise prevention structure according to this embodiment, the end surface of the cylindrical body portion 33 and the sliding surface of the sliding portion 43 (see the sliding portion 43 of the upper main body case 39a in FIG. 1) face each other in parallel. A projection (spherical tip projection) 61 facing the sliding surface of the sliding portion 43 is provided on at least one end surface of the cylindrical portion 33 (the upper end side of the cylindrical portion 33 in the illustrated example).
Are provided at equal intervals in the circumferential direction. That is, the end surface of the cylindrical body portion 33 comes into sliding contact with the sliding surface of the sliding portion 43 via the spherical tip projection 61.

According to the vibration sound preventing structure thus configured, the cylindrical portion 33 is moved by the sliding portion 4 via the spherical projection 61.
As point contact with the sliding surface of No. 3, similar to the first embodiment,
The collision area at the sliding portion is reduced, and rattling due to vibration when the slit plate is rotated can be reduced. Further, according to this structure, the spherical tip projection 61 is
The collision area of the sliding portion can be easily reduced only by providing

In the vibration sound preventing structure according to the third embodiment described above, the case where the spherical tip projection 61 is provided at the upper end of the cylindrical body part 33 has been described. It may be provided at the lower end of 33 or the upper and lower ends of the cylindrical body 33.

FIG. 5 is an enlarged sectional view of a main part showing a fourth embodiment of the vibration sound preventing structure of the present invention. In the vibration sound prevention structure according to this embodiment, the end surface of the cylindrical body 33 and the sliding surface of the sliding portion 43 face each other in parallel, and at least one of the sliding portions 43 (in the illustrated example, On the sliding surface of the sliding portion 43) of the side body case 39b, at least three or more projections (spherical tip projections) facing the end surface of the cylindrical body portion 33 are provided at equal intervals in the circumferential direction. That is, the sliding portion 43 comes into sliding contact with the end surface of the cylindrical body portion 33 via the spherical tip projection 71.

According to the vibration sound preventing structure configured as described above, the sliding portion 43 is connected to the cylindrical portion 33 through the spherical tip projection 71.
As in the first embodiment, the collision area at the sliding portion is reduced, and rattling due to vibration during rotation of the slit plate can be reduced. Further, according to this structure, since the spherical tip projection 71 is provided on the sliding portion 43, compared to the structure of the fourth embodiment, the spherical tip projection 71 is provided.
Can be formed large, and the spherical tip projection 71 can be hardly worn.

In the vibration sound preventing structure according to the fourth embodiment, the case where the spherical tip projection 71 is provided on the sliding portion 43 of the lower body case 39b has been described.
1 may be provided on the sliding portion 43 of the upper body case 39a or the sliding portion 43 of the upper and lower body cases 39a, 39b.

FIG. 6 is an enlarged sectional view of an essential part showing a fifth embodiment of the vibration sound preventing structure of the present invention, and FIG. 7 is an enlarged side view of the essential part explaining the operation of the fifth embodiment. In the vibration sound prevention structure according to this embodiment, the end surface of the cylindrical body 33 and the sliding surface of the sliding portion 43 face each other in parallel, and at least one of the sliding portions 43 (in the illustrated example, On the sliding surface of the sliding portion 43) of the side main body case 39b, at least three or more elastic portions 81 facing the end surface of the cylindrical portion 33 are provided at equal intervals in the circumferential direction. The elastic portion 81 has a base end connected to the sliding portion 43 and a free end at the distal end, and extends in the circumferential direction of the sliding portion 43. That is, the sliding portion 43 comes into sliding contact with the end surface of the tubular body portion 33 via the tip of the elastic portion 81.

According to the vibration sound preventing structure constructed in this manner, the slit plate 31 is rotated with the rotation of the steering shaft.
When the cylinder body 33 of the slit plate 31 tries to vibrate in the axial direction of the steering shaft, the end surface of the cylinder body 33 collides with the elastic portion 81, and the impact is elastically applied, as shown in FIG. The portion 81 absorbs and can reduce the rattling noise of the cylindrical portion 33, that is, the slit plate 31. Further, according to such an elastic portion 81, since the projecting direction of the elastic portion 81 is the same as the sliding direction of the cylindrical portion 33, the elastic portion 81
Frictional resistance at the time of contact can be reduced.

In the vibration noise prevention structure according to the fifth embodiment described above, the case where the elastic portion 81 is provided on the sliding portion 43 of the lower main body case 39b has been described. It may be provided on the sliding portion 43 of the main body case 39a or on the sliding portion 43 of the upper and lower main body cases 39a and 39b.

FIG. 8 is an enlarged sectional view of a main part showing a sixth embodiment of the vibration sound preventing structure of the present invention. In the vibration sound prevention structure according to this embodiment, the end surface of the cylindrical body 33 and the sliding surface of the sliding portion 43 face each other in parallel, and at least one of the sliding portions 43 (in the illustrated example, On the sliding surface of the sliding portion 43) of the side main body case 39b, at least three or more elastic portions 91 facing the end surface of the cylindrical portion 33 are provided at equal intervals in the circumferential direction. The elastic portion 91 has a proximal end connected to the sliding portion 43 and a free end at the distal end, and extends in the radial direction of the sliding portion 43. That is, the sliding portion 43 comes into sliding contact with the end surface of the tubular body portion 33 via the tip of the elastic portion 91.

According to the vibration sound preventing structure thus configured, similarly to the structure of the above-described fifth embodiment, the slit plate 31 rotates together with the rotation of the steering shaft, and the cylindrical portion 33 of the slit plate 31 moves. When an attempt is made to vibrate in the axial direction of the steering shaft, the end surface of the cylindrical body portion 33 collides with the elastic portion 91, and the impact is absorbed by the elastic portion 91.
That is, the rattling sound of the slit plate 31 can be reduced. In this embodiment, the elastic portion 91 is connected to the sliding portion 43.
, The space for forming the elastic portion 91 can be reduced, and the sliding portion 43 is formed.
A large number of elastic portions 91 can be formed in the circumferential direction.

In the vibration sound preventing structure according to the sixth embodiment, the case where the elastic portion 91 is provided on the sliding portion 43 of the lower main body case 39b has been described. It may be provided on the sliding portion 43 of the main body case 39a or on the sliding portion 43 of the upper and lower main body cases 39a and 39b.

Further, the vibration sound preventing structure may be a combination of the elastic part 81 and the elastic part 91 according to the fifth and sixth embodiments described above.

[0030]

As described above in detail, according to the vibration and noise prevention structure of the present invention, at least one end face of the cylindrical portion is formed with a curved surface, and the sliding portion facing the end face slides. Since the surface is formed as an inclined surface, the collision area at the sliding portion is reduced, and rattling due to vibration when the slit plate is rotated can be reduced. At least one end of the cylindrical portion is formed with a tapered surface whose outer diameter gradually decreases toward the tip, and the sliding surface of the sliding portion facing this end is formed with a curved surface. According to the structure, as described above, the collision area can be reduced, rattling noise can be reduced, and the center of rotation of the cylindrical body can be restricted to the center of the slit plate housing. The rattling noise caused by the collision can be reduced. In addition, according to the vibration sound preventing structure in which the projection facing the sliding portion is provided on at least one end surface of the cylindrical portion, the cylindrical portion makes point contact with the sliding portion via the projection,
In the same manner as described above, the collision area at the sliding portion is reduced, so that the rattling noise caused by vibration during rotation of the slit plate can be reduced, and the collision area of the sliding portion can be easily reduced. Furthermore, according to the vibration sound preventing structure in which the projection facing the end face of the cylindrical body is provided on at least one of the sliding sections, the sliding section is in point contact with the end face of the cylindrical section via the projection, and thus the same as described above. In addition, the collision area at the sliding portion is reduced, rattling due to vibration during rotation of the slit plate can be reduced, and the projection can be formed large, so that the projection can be hardly worn. In addition, according to the vibration sound preventing structure in which the elastic portion extending in the circumferential direction of the sliding portion is provided on the sliding portion, when the cylindrical portion tries to vibrate in the axial direction of the steering shaft, the end surface of the cylindrical portion is elastic. When the elastic portion absorbs the impact, the rattle of the slit plate can be reduced, and the elastic portion protrudes in the sliding direction of the cylindrical body portion. Friction resistance can be reduced. In addition, according to the vibration noise prevention structure in which the elastic portion extending in the radial direction of the sliding portion is provided on the sliding portion, the end face of the cylindrical portion collides with the elastic portion, and the elastic portion absorbs the impact, The rattle of the slit plate can be reduced, and the elastic portion protrudes in the radial direction of the sliding portion, so that the space for forming the elastic portion can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a slit plate and a slit plate accommodating portion showing a first embodiment of a vibration sound preventing structure of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the vibration sound preventing structure of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the vibration sound preventing structure of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the vibration sound preventing structure of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a fourth embodiment of the vibration sound preventing structure of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a fifth embodiment of the vibration sound prevention structure of the present invention.

FIG. 7 is an enlarged side view of an essential part for explaining the operation of the fifth embodiment.

FIG. 8 is an enlarged sectional view of a main part showing a sixth embodiment of the vibration sound preventing structure of the present invention.

FIG. 9 is an exploded perspective view of a conventional steering angle sensor.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

11 is an enlarged sectional view of a portion B in FIG.

[Explanation of symbols]

 33 cylindrical body part 31 slit plate 41 slit plate accommodation part 43 sliding part 45, 53 curved surface 47 inclined surface 51 taper surface 61, 71 protrusion 81, 91 elastic part

Claims (6)

[Claims] 1. A slit plate having a tubular portion inserted into a steering shaft so as to be relatively non-rotatable, and the tubular portion of the slit plate is rotatably accommodated coaxially and provided on both end surfaces of the tubular portion. A steering angle sensor including a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein at least one end surface of the cylindrical body portion is formed as a curved surface, and the sliding surface facing the end surface is formed. A vibration sound preventing structure for a steering angle sensor, wherein a sliding surface of a portion is formed by an inclined surface. 2. A slit plate having a cylindrical portion that is inserted into a steering shaft so as to be relatively non-rotatable, and the cylindrical portion of the slit plate is rotatably accommodated coaxially and provided on both end surfaces of the cylindrical portion. A steering angle sensor including a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein at least one end of the cylindrical portion gradually decreases in outer diameter toward a tip end. A vibration sound preventing structure for a steering angle sensor, wherein a sliding surface of the sliding portion facing the end is formed as a curved surface. 3. A slit plate having a cylindrical portion which is inserted into a steering shaft so as to be relatively non-rotatable, and the cylindrical portion of the slit plate is rotatably accommodated coaxially and provided on both end surfaces of the cylindrical portion. A steering angle sensor including a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein three or more protrusions facing the sliding portion are formed on at least one end surface of the cylindrical body portion. A vibration sound preventing structure for a steering angle sensor, which is provided in a circumferential direction. 4. A slit plate having a tubular portion inserted into the steering shaft so as to be relatively non-rotatable, and the tubular portion of the slit plate is rotatably accommodated coaxially and provided on both end surfaces of the tubular portion. A steering angle sensor having a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein at least one of the sliding portions has at least one of the protrusions facing the end surface of the cylindrical body portion. A vibration sound preventing structure for a steering angle sensor, which is provided in a circumferential direction. 5. A slit plate having a cylindrical portion which is inserted into a steering shaft so as to be relatively non-rotatable, and said cylindrical portion of said slit plate is rotatably accommodated coaxially and provided on both end surfaces of said cylindrical portion. A steering angle sensor comprising a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein a base end is connected to the sliding portion and a distal end is a free end; A vibration noise prevention of a steering angle sensor, wherein at least one of the sliding portions is provided with three or more elastic portions which extend in the circumferential direction and whose free end faces the end surface of the cylindrical body portion in the circumferential direction. Construction. 6. A slit plate having a cylindrical portion which is inserted into the steering shaft so as to be relatively non-rotatable, and the cylindrical portion of the slit plate is rotatably accommodated coaxially and provided on both end surfaces of the cylindrical portion. A steering angle sensor comprising a cylindrical slit plate housing portion having a pair of opposed flange-shaped sliding portions, wherein a base end is connected to the sliding portion and a distal end is a free end; A vibration sound preventing structure for a steering angle sensor, wherein at least one of the sliding portions has three or more elastic portions extending in a radial direction and the free end of which faces the end surface of the cylindrical body portion. .