JP2012171586A - Steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering device providing a superior feeling of steering while sufficiently suppressing generation of noise.SOLUTION: A rack guide mechanism 24 includes a support yoke 41 stored in a rack guide storage unit 32 and supporting a rack shaft 5 to be movable reciprocatively in an axial direction and a cylindrical elastic body 42 as a pressing member for pressing the support yoke 41 to the rack shaft 5 by being compressed between the support yoke 41 and a cap 34. In addition, core members 51 of a rigid material are respectively provided in positions on both ends in a width direction of the rack shaft 5 to the support yoke 41 in the cylindrical elastic body 42.

Description

  The present invention relates to a rack and pinion type steering apparatus.

  2. Description of the Related Art Conventionally, a vehicle steering apparatus includes a rack and pinion type that converts a rotation of a pinion shaft accompanying a steering operation into a reciprocating movement of the rack shaft by engaging a pinion shaft and a rack shaft. Normally, this type of steering device is provided with a rack guide mechanism that supports the rack shaft so as to be reciprocally movable in the axial direction while pressing the rack shaft against the pinion shaft. As the rack guide mechanism, a support yoke that slidably supports the rack shaft is pressed by a spring member such as a coil spring (see, for example, Patent Document 1) or a support yoke that is pressed by an elastic member made of a rubber material. (See, for example, Patent Document 2).

  By the way, the support yoke is housed in a cylindrical rack guide housing portion formed in the rack housing so as to be movable in a direction in which the support yoke moves toward and away from the rack shaft (contact and separation direction). And a gap exists between the inner peripheral surface of the rack guide housing portion. Further, the rack shaft is displaced or bent in a direction other than the axial direction by an external force such as a meshing reaction force with the pinion shaft or a road surface reaction force when traveling on a rough road. Therefore, the support yoke is displaced (tilted) in the rack guide housing portion with the movement of the rack shaft, and there is a possibility that abnormal noise may be generated by contacting (collising) with the inner peripheral surface.

  Therefore, in Patent Document 1, a support elastic member such as an O-ring is mounted on the outer peripheral surface of the support yoke to suppress the support yoke from contacting the rack guide housing portion. Moreover, in the said patent document 2, it suppresses that a support yoke contacts a rack guide accommodating part by the elastic member (elastically deformable member) which presses a support yoke abutting on the internal peripheral surface of a rack guide accommodating part. It also plays a function.

JP-A-2005-41251 JP 2005-254880 A

  By the way, in recent years, a higher level of silence has been demanded in vehicles. However, in each of the above conventional configurations, only an elastic member made of a rubber material or the like is interposed between the outer peripheral surface of the support yoke and the inner peripheral surface of the rack guide housing portion, so that a large load is applied from the rack shaft. In the case of the action, the support yoke may come into contact with the rack guide housing portion, and there is still a possibility that abnormal noise is generated. Therefore, it can be considered that the elastic member is made of a material having a high elastic coefficient, thereby preventing the support yoke from coming into contact with the rack guide housing portion even when a large load is applied.

  Here, since the support yoke is in sliding contact with the rack shaft, the steering force exceeding the static friction force acting between the rack shaft and the support yoke is applied by the driver at the start of steering (when the rack shaft starts moving). Until the application, the rack shaft moves in the axial direction integrally with the support yoke as the elastic member deforms in the axial direction of the rack shaft. As a result, steering can be performed without applying a steering force that exceeds the static frictional force to the carriage, and it is easy to perform delicate steering with a small steering amount.

  Therefore, when the elastic coefficient of the elastic member is increased as described above, the elastic member is hardly deformed in the axial direction of the rack shaft. As a result, the rack shaft is almost completely moved until the driver's steering force exceeds the static friction force. There is a problem that it becomes impossible to move in the axial direction and it becomes difficult to perform delicate steering with a small steering amount.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a steering device with excellent steering feeling while sufficiently suppressing the occurrence of abnormal noise.

  In order to achieve the above object, the invention according to claim 1 is directed to a pinion shaft that is rotated by a steering operation, a rack shaft meshed with the pinion shaft, and the rack shaft while pressing the rack shaft against the pinion shaft. A rack guide mechanism that is supported so as to be capable of reciprocating in an axial direction, and a rack housing that is formed with a rack guide accommodating portion that accommodates the rack guide mechanism. The rack guide mechanism is accommodated in the rack guide accommodating portion. The support yoke includes a support yoke and a pressing member, and the support yoke is movably provided in the rack guide housing portion so as to be moved toward and away from the rack shaft while being pressed against the rack shaft by the pressing member. In the steering device, an annular elastic member provided between the support yoke and the rack guide housing portion A direction orthogonal to the axial direction of the rack shaft on a plane orthogonal to the contact / separation direction is defined as a width direction of the rack shaft, and the elastic member has both sides of the rack shaft in the width direction with respect to the support yoke, The gist is that a core member having a higher elastic coefficient than that of the elastic member is provided.

  According to the above configuration, the elastic member is provided with the core member having a high elastic coefficient at positions on both sides in the width direction of the rack shaft as viewed from the support yoke, so that the elastic member is provided between the support yoke and the rack guide accommodating portion. However, it becomes difficult to deform (compress) in the width direction of the rack shaft. Accordingly, even when a large load in the width direction of the rack shaft is applied to the support yoke due to the displacement of the rack shaft or the like, it is possible to suppress the support yoke from contacting the rack guide housing portion. In addition, since the elastic member is hardly deformed in the width direction of the rack shaft by the core member, it is not necessary to increase the elastic coefficient of the elastic member itself, and the elastic member is attached to the rack shaft between the support yoke and the rack guide housing portion. It becomes possible to easily deform in the axial direction, and it becomes easy to perform delicate steering with a small steering amount. Therefore, it is possible to realize a good steering feeling while sufficiently suppressing the occurrence of abnormal noise.

  According to a second aspect of the present invention, in the steering apparatus according to the first aspect, the elastic member is disposed between the support yoke and a cap fixed to the rack guide housing portion in the contact / separation direction of the support yoke. The gist is that the pressing member is formed by the elastic member.

  According to the above configuration, the rack shaft is pressed against the pinion shaft by the elastic force generated when the elastic member is compressed in the contact / separation direction, so the number of parts is reduced compared to the case where a separate pressing member such as a coil spring is provided. The cost can be reduced.

  A gist of a third aspect of the present invention is the steering apparatus according to the second aspect, wherein the core member is disposed at a position facing the support yoke in a contact / separation direction of the support yoke.

  According to the above configuration, since the core member is disposed at a position facing the support yoke in the contact / separation direction, the core member is disposed between the support yoke and the cap as compared with the case where the core member is disposed at a position not opposed to the support yoke. It becomes difficult for the elastic member to be compressed in the contact / separation direction. Accordingly, even when a large load in the contact / separation direction is applied to the support yoke due to, for example, application of reverse input stress, it is possible to suppress the generation of abnormal noise due to the support yoke contacting the cap.

  According to a fourth aspect of the present invention, in the steering apparatus according to any one of the first to third aspects, the elastic member includes hollow hollows on both sides in the axial direction of the rack shaft with respect to the support yoke. The gist is that the part is formed.

  According to the above configuration, the elastic member is formed with the thinned portions on both sides in the axial direction of the rack shaft as viewed from the support yoke. Therefore, the elastic member is disposed between the support yoke and the rack guide housing portion. It becomes easy to deform (compress) in the direction. Therefore, it becomes easier to perform delicate steering with a small steering amount.

  Here, in the configuration in which the elastic member presses the support yoke as in claim 2, it is necessary to use a material having a certain degree of elastic coefficient in order to secure the force with which the elastic member presses the support yoke against the rack shaft. Therefore, the effect of facilitating the deformation of the elastic member in the axial direction of the rack shaft by forming the thinned portion in the configuration of claim 2 is significant.

  According to the present invention, it is possible to provide a steering device with excellent steering feeling while sufficiently suppressing the occurrence of abnormal noise.

The schematic block diagram of an electric power steering device (EPS). Sectional drawing which shows the rack and pinion mechanism and peripheral structure of this embodiment. The expanded sectional view which shows the rack guide mechanism of this embodiment. AA sectional drawing of FIG.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, in an electric power steering apparatus (EPS) 1, a steering shaft 3 to which a steering 2 is fixed is connected to a rack shaft 5 via a rack and pinion mechanism 4. Thereby, the rotation of the steering shaft 3 accompanying the steering operation is converted into a reciprocating linear motion of the rack shaft 5 by the rack and pinion mechanism 4. The steering shaft 3 is formed by connecting a column shaft 8, an intermediate shaft 9, and a pinion shaft 10. Then, the reciprocating linear motion of the rack shaft 5 accompanying the rotation of the steering shaft 3 is transmitted to a knuckle (not shown) via tie rods 11 connected to both ends of the rack shaft 5, so that the steering angle of the steered wheels 12 is increased. That is, the traveling direction of the vehicle is changed.

  The EPS 1 is configured as a so-called column assist type EPS that rotationally drives the column shaft 8 with the motor 13 as a drive source. Specifically, the motor 13 is drivingly connected to the column shaft 8 via a speed reduction mechanism 14 composed of a worm and wheel. The rotation of the motor 13 is decelerated by the speed reduction mechanism 14 and transmitted to the column shaft 8 so that the motor torque is applied to the steering system as an assist force.

Next, the rack and pinion mechanism and its peripheral configuration will be described.
The rack and pinion mechanism 4 is configured by meshing rack teeth 21 formed on the rack shaft 5 and pinion teeth 22 formed on the pinion shaft 10. The rack teeth 21 of the present embodiment are formed as oblique teeth (helical gears) whose teeth are inclined with respect to the axis of the rack shaft 5, and the pinion teeth 22 are aligned with the axis of the pinion shaft 10. It is formed in the inclined tooth inclined with respect to it. The rack shaft 5 is disposed within the substantially cylindrical rack housing 23 with a predetermined crossing angle with the pinion shaft 10. The EPS 1 is provided with a rack guide mechanism 24 that supports the rack shaft 5 so as to reciprocate in the axial direction of the rack shaft 5 while pressing the rack shaft 5 against the pinion shaft 10. The rack guide mechanism 24 keeps the backlash between the rack teeth 21 and the pinion teeth 22 properly, and suppresses the generation of rattling noise.

  Specifically, as shown in FIG. 2, the rack guide 23 is accommodated in the rack housing 23 with the rack shaft 5 sandwiched between the pinion accommodating portion 31 in which the pinion shaft 10 is accommodated and the pinion accommodating portion 31. A rack guide accommodating portion 32 is formed. The pinion accommodating portion 31 extends in the axial direction of the pinion shaft 10 and is formed in a cylindrical shape with one end side (the upper side in FIG. 2) opened. On the other hand, the rack guide housing portion 32 extends in a direction substantially orthogonal to the rack shaft 5 and the pinion shaft 10, and one end side (the right side in FIG. 2) opens into the rack housing 23 and the other end side (the left side in FIG. 2). ) Is formed in a substantially cylindrical shape opened to the outside of the rack housing 23. The external opening end 33 on the other end side of the rack guide housing portion 32 is closed by screwing a substantially disk-shaped cap 34.

  The pinion shaft 10 is housed in the pinion housing portion 31 in such a manner that an upper end 10 a connected to the intermediate shaft 9 (see FIG. 1) protrudes from the pinion housing portion 31. The pinion shaft 10 is rotatably supported by bearings 35 and 36 provided in the pinion housing portion 31. The pinion teeth 22 are formed between a portion of the pinion shaft 10 supported by the bearing 35 and a portion supported by the bearing 36.

  As shown in FIGS. 2 and 3, the rack guide mechanism 24 is the same as the support yoke 41 that supports the rack shaft 5 so as to be capable of reciprocating in the axial direction, and is compressed between the support yoke 41 and the cap 34. A cylindrical elastic body 42 as a pressing member that presses the support yoke 41 against the rack shaft 5 is provided.

  The support yoke 41 has a substantially cylindrical main body 43 and a support 44 that protrudes toward the cap 34 from the end of the main body 43 opposite to the rack shaft 5. The support portion 44 is formed in a cylindrical shape having an outer diameter smaller than that of the main body portion 43. The end of the main body 43 on the rack shaft 5 side is recessed in a circular arc shape corresponding to the back surface 5a on the opposite side of the rack shaft 5 from the pinion shaft 10 side as viewed in the axial direction of the rack shaft 5. A sliding contact groove 45 extending in the axial direction of the shaft 5 is formed. In the present embodiment, the inner surface of the sliding contact groove 45 is a sliding contact surface when the rack shaft 5 is pressed.

  The support yoke 41 is accommodated in the rack guide accommodating portion 32 so as to be movable in a direction substantially perpendicular to the rack shaft 5 and the pinion shaft 10, that is, in a direction in which the support yoke 41 is in contact with and away from the rack shaft 5. ing. Specifically, the outer diameter of the main body portion 43 of the support yoke 41 is formed smaller than the inner diameter of the rack guide housing portion 32, and between the outer peripheral surface of the main body portion 43 and the inner peripheral surface of the rack guide housing portion 32. An annular gap S1 is formed.

  The cylindrical elastic body 42 is formed in a cylindrical shape, and the support portion 44 of the support yoke 41 is inserted into the insertion hole 46 formed in the center thereof. The cylindrical elastic body 42 has an inner diameter that is substantially equal to the outer diameter of the support portion 44, and an outer diameter that is substantially equal to the inner diameter of the rack guide housing portion 32. Thereby, the cylindrical elastic body 42 is provided between the rack guide housing portion 32 and the support yoke 41 in a state of being in contact with the inner circumferential surface of the rack guide housing portion 32 and the outer circumferential surface of the support portion 44. . That is, the cylindrical elastic body 42 of the present embodiment corresponds to an annular elastic member.

  The cylindrical elastic body 42 is formed such that the length along the contact / separation direction is longer than the length along the contact / separation direction of the support portion 44, and is opposite to the rack shaft 5 of the cylindrical elastic body 42. Is in contact with the cap 34. A gap S <b> 2 is formed between the cap 34 and the support portion 44. The cylindrical elastic body 42 has the cap 34 screwed to the outer opening end 33 and is compressed in the contact / separation direction between the support yoke 41 and the cap 34, thereby pressing the support yoke 41 against the rack shaft 5. ing. Thus, the support yoke 41 is configured to support the rack shaft 5 so as to be capable of reciprocating while pressing the rack shaft 5 against the pinion shaft 10 side.

(Abnormal noise suppression structure)
Next, a structure for suppressing noise generated when the support yoke in the rack guide mechanism of the present embodiment contacts the rack guide housing portion will be described.

  As described above, the rack shaft 5 is displaced or deflected in a direction other than the axial direction due to the reaction force of engagement with the pinion shaft 10, so that the support yoke 41 contacts (collises) with the rack guide housing portion 32. Then, there is a possibility that abnormal noise occurs. In particular, in this embodiment, since the rack teeth 21 and the pinion teeth 22 are inclined teeth, the rack shaft 5 has an axial direction of the rack shaft 5 on a plane orthogonal to the contact / separation direction with its reciprocation. Since the load in the direction perpendicular to the rack axis 5 (the width direction of the rack shaft 5) acts from the pinion shaft 10, the support yoke 41 is displaced (tilted) in the width direction and noise is likely to occur. However, if the displacement of the support yoke 41 is suppressed by configuring the cylindrical elastic body 42 with a material having a high elastic coefficient, the cylindrical elastic body 42 is difficult to be deformed in the axial direction of the rack shaft 5. It is difficult to make a small and delicate steering with a small.

  Considering this point, as shown in FIGS. 3 and 4, a core member 51 made of a rigid material is embedded in the cylindrical elastic body 42. The core member 51 faces the support yoke 41 in both sides of the rack shaft 5 in the width direction with respect to the support portion 44 of the support yoke 41 and in the contact / separation direction (position between the support yoke 41 and the cap 34). Is arranged. In the present embodiment, the core member 51 is made of a metal material such as iron.

  Specifically, the core member 51 is formed in a cylindrical shape. The diameter of the core member 51 (length along the width direction of the rack shaft 5) is smaller than the wall thickness (thickness along the width direction of the rack shaft 5) of the cylindrical elastic body 42, and the main body of the support yoke 41 The gap S <b> 1 between the portion 43 and the rack guide housing portion 32 is formed to be larger than the interval in the width direction (length along the width direction of the rack shaft 5) D <b> 1. Further, the axial length of the core member 51 (the length along the contact / separation direction) is shorter than the axial length of the cylindrical elastic body 42 and the contact of the gap S <b> 2 between the support portion 44 and the cap 34. It is formed longer than the separation interval (length along the contact / separation direction) D2.

  The core member 51 is positioned on a straight line L1 that passes through the center O of the support yoke 41 and is parallel to the width direction of the rack shaft 5, and near the center between the outer peripheral surface and the inner peripheral surface of the cylindrical elastic body 42. Is arranged. Further, the core member 51 is disposed in the vicinity of the center between both axial end surfaces of the cylindrical elastic body 42. Thereby, the core member 51 is not exposed to the outside, and is entirely embedded in the cylindrical elastic body 42.

  As shown in FIG. 4, the cylindrical elastic body 42 has a hollow shape in which a part of the cylindrical elastic body 42 is thinned at positions on both sides in the axial direction of the rack shaft 5 with respect to the support portion 44 of the support yoke 41. Are respectively formed (so-called “curly”) 52. Specifically, the thinned portion 52 is formed in a hole shape having an elliptical cross section penetrating in the axial direction of the cylindrical elastic body 42, and passes through the center O of the support yoke 41 on a straight line L <b> 2 parallel to the axial direction. Is arranged.

As described above, according to the present embodiment, the following operational effects can be achieved.
(1) Core members 51 made of a rigid material are provided at positions on both sides in the width direction of the rack shaft 5 with respect to the support yoke 41 in the cylindrical elastic body 42.

  According to the above configuration, the cylindrical elastic body 42 is racked between the support yoke 41 and the rack guide accommodating portion 32 by the core members 51 provided at the positions on both sides in the width direction of the rack shaft 5 when viewed from the support yoke 41. It becomes difficult to be deformed (compressed) in the width direction of the shaft 5. Thereby, even when a large load in the width direction of the rack shaft 5 acts on the support yoke 41 due to the displacement of the rack shaft 5 or the like, the support yoke 41 can be prevented from contacting the rack guide housing portion 32. Further, since the cylindrical elastic body 42 is hardly deformed in the width direction of the rack shaft 5 by the core member 51, the elastic coefficient of the cylindrical elastic body 42 itself does not need to be increased, and the support yoke 41 and the rack guide accommodating portion 32 are not required. Therefore, the cylindrical elastic body 42 can be easily deformed in the axial direction of the rack shaft 5, and delicate steering with a small steering amount is facilitated. Therefore, it is possible to realize a good steering feeling while sufficiently suppressing the occurrence of abnormal noise.

  (2) The cylindrical elastic body 42 is formed longer in the contact / separation direction than the support portion 44 of the support yoke 41, and the cylindrical elastic body 42 is compressed in the contact / separation direction between the support yoke 41 and the cap 34. Thus, the support yoke 41 is pressed against the rack shaft 5.

  According to the said structure, compared with the case where pressing members, such as a coil spring, are provided separately, a number of parts can be reduced and cost reduction can be aimed at. In addition, compared to the case where the pressing member is formed of a metal material such as a coil spring, it is possible to suppress abnormal noise generated when the support yoke 41 slides with the displacement of the support yoke 41.

  (3) Since the core member 51 is disposed at a position facing the support yoke 41 in the contact / separation direction, the space between the support yoke 41 and the cap 34 is smaller than when the core member 51 is disposed at a position not facing the support yoke 41. Thus, the cylindrical elastic body 42 is hardly compressed in the contact / separation direction. As a result, even when a large load in the contact / separation direction is applied to the support yoke 41 due to, for example, application of reverse input stress, the support yoke 41 is prevented from coming into contact with the cap 34 and generating abnormal noise. it can.

  (4) Since the hollow hollow portions 52 are formed at positions on both sides in the axial direction of the rack shaft 5 with respect to the support yoke 41 in the cylindrical elastic body 42, the cylindrical elastic body 42 is deformed in the axial direction of the rack shaft 5. (Compression) is easy. Therefore, it becomes easier to perform delicate steering with a small steering amount. In particular, in this embodiment, since the cylindrical elastic body 42 secures a force for pressing the support yoke 41 against the rack shaft 5, it is necessary to configure the cylindrical elastic body 42 using a material having a certain degree of elasticity. Thus, the effect of facilitating the deformation of the cylindrical elastic body 42 in the axial direction of the rack shaft 5 by forming the thinned portion 52 is great.

  (5) Since the core member 51 is made of a rigid material, the concentric member 51 is not substantially deformed, and the cylindrical elastic body 42 is effectively prevented from being deformed in the width direction and the contact / separation direction of the rack shaft 5. Can do.

(6) Since the diameter of the core member 51 is formed larger than the width direction interval D1 of the gap S1, the support yoke 41 can be reliably prevented from coming into contact with the inner peripheral surface of the rack guide housing portion 32.
(7) Since the axial length of the core member 51 is longer than the contact distance D2 of the gap S2, the support yoke 41 can be reliably prevented from contacting the cap 34.

In addition, the said embodiment can also be implemented in the following aspects which changed this suitably.
In the above embodiment, the thinned portion 52 is formed in a hole shape penetrating in the axial direction of the cylindrical elastic body 42. However, the present invention is not limited to this, and it may not be penetrated in the axial direction of the cylindrical elastic body 42. . Further, the hollow portion 52 may not be formed on the cylindrical elastic body 42.

  In the above embodiment, the core member 51 is made of a rigid material. However, the present invention is not limited to this, and the core member 51 is made of a material other than the rigid material as long as it has a higher elastic coefficient than the cylindrical elastic body 42. May be.

  In the above embodiment, the diameter of the core member 51 is formed larger than the width direction interval D1 of the gap S1, but not limited to this, the diameter of the core member 51 may be equal to or less than the width direction interval D1. In this case as well, it is desirable to design the cylindrical elastic body 42 so that the amount of the elastic deformation of the cylindrical elastic body 42 in the width direction of the rack shaft 5 is smaller than the width direction interval D1.

  Similarly, the axial length of the core member 51 may be shorter than the contact / separation direction distance D <b> 2 between the support portion 44 and the cap 34. In this case as well, it is desirable that the amount of elastic deformation of the cylindrical elastic body 42 in the contact / separation direction is designed to be smaller than the contact / separation direction interval D2.

  In the above embodiment, the core member 51 is disposed at a position facing the support yoke 41 in the contact / separation direction. However, the present invention is not limited thereto, and the core member 51 is disposed at a position not facing the support yoke 41 in the contact / separation direction. Also good.

  In the above embodiment, the rack shaft 5 is pressed against the pinion shaft 10 by the cylindrical elastic body 42. However, the configuration is not limited thereto, and the cylindrical elastic body 42 does not press the support yoke 41, and the support yoke 41 is separately provided. A spring member (for example, a coil spring) may be provided as a pressing member that presses against the rack shaft 5.

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering apparatus (EPS), 4 ... Rack guide mechanism, 5 ... Rack shaft, 10 ... Pinion shaft, 23 ... Rack housing, 24 ... Rack guide mechanism, 31 ... Pinion accommodating part, 32 ... Rack guide accommodating part, 33 ... External opening end, 34 ... Cap, 41 ... Support yoke, 42 ... Cylinder elastic body, 43 ... Main body part, 44 ... Supporting part, 45 ... Sliding groove, 46 ... Insertion hole, 51 ... Core member, 52 ... Thinned portion, D1... Width direction interval, D2 .. contact and separation direction interval, L1, L2... Straight line, O... Center, S1, S2.

Claims (4)

A pinion shaft that is rotated by a steering operation; a rack shaft that meshes with the pinion shaft; a rack guide mechanism that supports the rack shaft so as to reciprocate in the axial direction of the rack shaft while pressing the rack shaft against the pinion shaft; A rack housing formed with a rack guide housing portion for housing the guide mechanism, the rack guide mechanism having a support yoke and a pressing member housed in the rack guide housing portion, In the steering device provided so as to be movable in the contact / separation direction contacting / separating with respect to the rack shaft within the rack guide housing portion while being pressed against the rack shaft by a member,
An annular elastic member provided between the support yoke and the rack guide accommodating portion;
A direction perpendicular to the axial direction of the rack shaft on a plane perpendicular to the contact / separation direction is defined as a width direction of the rack shaft, and the elastic member is provided on both sides of the rack shaft in the width direction with respect to the support yoke. A steering apparatus comprising a core member having a higher elastic coefficient than that of the member. The steering apparatus according to claim 1, wherein
The elastic member is formed to be compressible in the contact / separation direction of the support yoke between the support yoke and a cap fixed to the rack guide housing portion,
The pressing device is constituted by the elastic member. The steering apparatus according to claim 2, wherein
The steering device according to claim 1, wherein the core member is disposed at a position facing the support yoke in a contact / separation direction of the support yoke. In the steering device according to any one of claims 1 to 3,
The steering device according to claim 1, wherein hollow portions are formed in the elastic member on both sides in the axial direction of the rack shaft with respect to the support yoke.

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