JPH10213431A - Sliding-sound preventing structure of steering angel sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding-sound preventing structure of a steering angle sensor, which can decrease the rotation resistance without using grease and can lower the generation of sliding sound permanently. SOLUTION: A slit plate 25 has a tube body part 27, which is inserted into a steering shaft so that relative turning is impossible. A pair of flange-shaped sliding parts 33 surround the outer surface of the tube body part 27 with a surrounding wall 29, contain the tube body part 27 and face both edges 31 of the tube body part 27. A slit-plate containing part 23 in the cylindrical shape has the pair of flange-shaped sliding parts 33. In the steering angle sensor having these parts, a slippery layer 35 is formed at least on an edge 31 of the tube body part 27 and the sliding surface of the sliding part 33. Furthermore, the slippery layer 35 can be formed by coating, e.g. slippery material.

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 an improvement in a sliding portion between a main body case and a slit plate built in the main body case. Things.

[0002]

2. Description of the Related Art A centrifugal force is applied to a turning car.
Rotational movement (roll) occurs around the longitudinal axis of the vehicle. 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. 5 and 6, a steering angle sensor 1 is provided.
Is a slit plate 3 attached to the steering shaft and rotated, a light emitting element 5 and a light receiving element 7 sandwiching the slit plate 3, a sensor housing 9 for housing the light emitting element 5 and the light receiving element 7, and a rotation of the slit plate 3. It has a pair of main body cases 13a and 13b that freely hold and accommodate 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 and cutoff of light by the slit plate 3, and this is processed by a signal processing circuit. Has calculated the rotation angle, the rotation direction, and the angular velocity, and sent them to an absorber control (ECU) or the like.

[0005]

SUMMARY OF THE INVENTION In the steering angle sensor 1,
The slit plate 3 rotates in the main body cases 13a and 13b together with the steering shaft. The slit plate 3 has a cylindrical body 17 which is open and closed at the center of an annular plate having a slit hole 15 formed in a concentric shape, and the cylindrical body 17 is inserted into the outer periphery of the steering shaft so as not to rotate relatively. . The slit plate 3 rotates by sliding upper and lower end surfaces 17a, 17b of the cylindrical body portion 17 with respect to a sliding portion 19 shown in FIG. 7 formed in the slit plate housing portions of the main body cases 13a, 13b.
However, at this time, the sliding portion 19 and the upper and lower end faces 17a, 1
Rotational resistance and rotational sliding noise occur due to friction between the roller 7b. Therefore, conventionally, grease g is applied to the sliding portion 19 to reduce the rotational resistance and the rotational sliding noise. However, in the conventional measures for reducing the rotational resistance and the sliding noise described above, the grease g flows out from the sliding portion 19 due to continuous use (rotation), and the durability as the countermeasure against the rotational resistance and the sliding noise is reduced. There was a missing problem. The present invention has been made in view of the above circumstances, and provides a sliding noise prevention structure of a steering angle sensor that can reduce rotational resistance without using grease and permanently reduce generation of sliding noise. It is in.

[0006]

In order to achieve the above object, the present invention provides a sliding noise prevention structure, comprising: a slit plate having a cylindrical portion which is inserted into a steering shaft so as not to rotate relatively; And a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces of the cylindrical body portion while surrounding the outer periphery of the cylindrical body with a peripheral wall and rotatably housing the cylindrical body portion. In the steering angle sensor, a lubricating layer is formed at least on an end surface of the cylindrical body portion and a sliding surface of the sliding portion. In the sliding noise prevention structure, the slip layer can be formed by coating a slip material on an end surface of the cylindrical body portion and a sliding surface of the sliding portion. Further, in the sliding noise prevention structure, the slip layer may be formed by attaching a slip sheet to an end surface of the cylindrical body portion and a sliding surface of the sliding portion. Furthermore, the sliding noise prevention structure
The lubricating layer may be formed by double-molding the end of the cylindrical portion and the sliding portion with a resin having a small coefficient of friction.

In the sliding noise prevention structure configured as described above,
The sliding surface between the slit plate and the slit plate housing portion slides through the slippery layer, so that the sliding resistance is reduced without using grease, and the grease applying step and the grease material are not required. Further, in the sliding noise prevention structure in which the sliding surface is coated on the end surface of the cylindrical portion and the sliding surface of the sliding portion, it is possible to form a slipping layer only on the sliding surface. In addition, in the sliding noise prevention structure in which a slip sheet is adhered to the end surface of the cylindrical portion and the sliding surface of the sliding portion, special coating equipment such as when coating is not required. Furthermore, in the sliding noise prevention structure in which the end of the cylindrical portion and the sliding portion are double-molded with a resin having a small coefficient of friction, the slipping layer can be formed with a sufficient thickness.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sliding noise prevention 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 housing portion showing a first embodiment of a sliding noise prevention structure according to the present invention,
FIG. 2 is an enlarged sectional view of a main part of the sliding noise prevention structure according to the present invention. The upper and lower main body case 21 of the steering angle sensor has a slit plate housing 23 formed therein.
Is a peripheral wall 29 surrounding the cylindrical body portion 27 of the slit plate 25.
And an annular plate-shaped sliding portion 33 that is in sliding contact with the end surface 31 of the cylindrical body portion 27. The slit plate accommodation part 23 is the slit plate 2
The fifth cylindrical body 27 is rotatably accommodated coaxially. The slit plate 25 rotates together with the steering shaft by inserting the cylindrical body portion 27 into a steering shaft (not shown) so as not to rotate relatively. The axial movement of the slit plate 25 is regulated by bringing the both end surfaces 31 of the cylindrical body portion 27 into contact with the sliding portion 33.

[0009] As shown in FIG.
The lubricating material 34 is provided on the end face 31 of the
To form a lubricating layer 35. As the lubricating material 34, a fluororesin or the like having a small coefficient of friction and excellent in abrasion resistance and chemical resistance, for example, Teflon (a trademark of US DuPont) can be suitably used.

In addition to coating the end surface 31 of the cylindrical portion 27 and the sliding surface of the sliding portion 33 described above, the slippery layer 35 is coated on the outer peripheral surface of the cylindrical portion 27 and the inner peripheral surface of the peripheral wall 29. May be formed by coating.

According to the sliding noise prevention structure configured as described above, the sliding surface between the slit plate 25 and the slit plate housing portion 23 slides via the slippery layer 35, and does not use grease. As a result, the sliding resistance is reduced, and the rotational torque and the sliding noise can be reduced. Further, since the grease application step and the grease material can be reduced, the manufacturing cost can also be reduced.

The configuration of the sliding noise preventing structure for forming the slippery layer 35, including the above-described example, is as follows. That is, the lubricating layer 35 may be formed by coating only the sliding surfaces of the upper and lower main body case 21 and the slit plate 25. In this case, the coating area can be reduced and the coating can be formed economically. The lubricating layer 35 may be formed by coating the entire upper and lower body case 21 and the slit plate 25. In this case, coating can be easily performed for each component. The slippery layer 35 may be formed by coating only one of the sliding surfaces of the upper main body case 21, the lower main body case 21, and the slit plate 25. In this case, the coating area can be minimized.
The slippery layer 35 includes the upper body case 21, the lower body case 21,
Any one of the slit plates 25 may be formed by coating. In this case, coating can be easily performed with a small coating area.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the sliding noise prevention structure according to the present invention. In this embodiment, the lubricating sheets 41, 41 are attached to at least the end surface 31 of the cylindrical body portion 27 and the sliding surface of the sliding portion 33,
A lubricating layer 43 is formed. As the slip sheet 41,
As described above, a fluorine resin or the like can be suitably used.

The lubricating sheet 41 is provided with one end surface of the cylindrical portion 27 and a sliding surface of one sliding portion 33 opposed thereto, or both end surfaces of the cylindrical portion 27 and upper and lower sliding surfaces opposed thereto. Part 33
May be stuck on the sliding surface of.

According to the sliding noise prevention structure thus configured, similar to the above-described sliding noise prevention structure according to the first embodiment,
The sliding surface between the slit plate 25 and the slit plate housing 23 is
Since the sliding is performed through the slipping layer 43 by the slipping sheet 41, the rotating torque and the sliding noise can be reduced, and the grease application step and the grease material can be reduced, so that the manufacturing cost can be reduced. it can. Further, according to the sliding noise prevention structure, since the slip layer 43 can be formed by sticking the slip sheet 41, no special coating equipment is required as in the case of performing coating.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the sliding noise prevention structure according to the present invention. In this embodiment, the lubricating layer 53 is formed by double-molding at least the end of the cylindrical body 27 and the sliding portion 33 with the resin 51 having a small friction coefficient. As the resin 51 having a small friction coefficient, a fluorine resin or the like can be suitably used as described above.

The lubricating layer 53 using the resin 51 is
7 may be double-molded into one end portion and one sliding portion 33 opposed thereto, or both end portions of the cylindrical body portion 27 and upper and lower sliding portions 33 opposed thereto.

According to the sliding noise prevention structure configured as described above, similar to the sliding noise prevention structure according to the above-described first embodiment,
The sliding surface between the slit plate 25 and the slit plate housing 23 is
Since the sliding is performed via the slip layer 53 made of the resin 51, the rotating torque and the sliding noise can be reduced, and the grease application step and the grease material can be reduced, so that the manufacturing cost can be reduced. In addition, according to the sliding noise prevention structure, since the resin 51 is double-molded to form the slipping layer 53, the slipping layer 53 can be formed with a sufficient thickness, and the slipping of the slipping layer 53 due to abrasion, etc. And a highly reliable slip layer 53 can be obtained.

[0019]

As described in detail above, according to the sliding noise prevention structure of the present invention, the sliding surface between the slit plate and the slit plate housing slides through the slippery layer. Thus, the sliding resistance is reduced without using grease, so that the rotational torque and the sliding noise can be reduced, and the grease application step and the grease material can be reduced, so that the manufacturing cost can be reduced. According to the sliding noise prevention structure in which the sliding surface is coated on the end surface of the cylindrical portion and the sliding surface of the sliding portion, the slipping layer can be economically formed with a small area. In addition, according to the sliding noise prevention structure in which a slip sheet is adhered to the end surface of the cylindrical body portion and the sliding surface of the sliding portion, the sliding noise can be reduced and the coating is performed as in the case of performing coating. No special coating equipment is required. Furthermore,
According to the sliding noise prevention structure in which the end portion of the cylindrical portion and the sliding portion are double-molded with a resin having a small coefficient of friction, the sliding noise can be reduced, and the slipping layer has a sufficient thickness. Can be formed, and the reliability of the lubricating layer can be enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a slit plate and a slit plate housing showing a first embodiment of a sliding noise prevention structure according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the sliding noise prevention structure according to the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the sliding noise prevention structure according to the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the sliding noise prevention structure according to the present invention.

FIG. 5 is an exploded perspective view of a conventional steering angle sensor.

FIG. 6 is a longitudinal sectional view of a conventional steering angle sensor.

FIG. 7 is an enlarged view of a portion A in FIG. 5;

[Explanation of symbols]

 Reference Signs List 23 Slit plate accommodation part 25 Slit plate 27 Cylindrical part 29 Peripheral wall 31 End face 33 Sliding part 34 Slipper 35, 43, 53 Slippery layer 41 Slippery sheet 51 Resin with small coefficient of friction

Claims (4)

[Claims] A slit plate having a cylindrical portion inserted into a steering shaft so as to be relatively non-rotatable; and a peripheral wall surrounding an outer periphery of the cylindrical portion and accommodating the cylindrical portion so as to be rotatable. A steering angle sensor including a cylindrical slit plate housing portion having a pair of flange-shaped sliding portions opposed to both end surfaces of the body portion, wherein at least an end surface of the cylindrical body portion and a sliding surface of the sliding portion; A sliding noise prevention structure for a steering angle sensor, wherein a slip layer is formed on the steering angle sensor. 2. The steering angle sensor according to claim 1, wherein the lubricating layer is formed by coating a lubricating material on an end surface of the cylindrical body portion and a sliding surface of the sliding portion. Sliding noise prevention structure. 3. The steering angle according to claim 1, wherein the lubricating layer is formed by attaching a lubricating sheet to an end surface of the cylindrical body and a sliding surface of the sliding portion. A sliding noise prevention structure for the sensor. 4. The steering angle according to claim 1, wherein the lubricating layer is formed by double-molding an end portion of the cylindrical body portion and the sliding portion with a resin having a small coefficient of friction. A sliding noise prevention structure for the sensor.