JPH0565745U - Steering shaft support structure - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to easily fit the holding cylinder to the outer periphery of the bearing and reliably prevent noise in the engine room from entering the vehicle interior. [Structure] The cutting portion 6 of the holding cylinder 4 is located at an intermediate portion of the axial length of the holding cylinder 4 and extends in the circumferential direction.
And the holding cylinder 4 from one end in the length direction of the circumferential cutting portion 6a.
From a first axial cutting portion 6b extending toward one axial side and a second axial cutting portion 6c extending from the other longitudinal end of the circumferential cutting portion 6a to the other axial end of the holding cylinder 4. It is formed into a crank shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for a steering shaft.

[0002]

[Prior Art]

 Generally, a steering shaft which is disposed so as to pass through the dash panel is formed on the dash panel on the inner surface of the dash panel on the vehicle compartment side, as shown in, for example, Japanese Utility Model Laid-Open No. 58-75176. A tubular bracket surrounding the through hole of the steering shaft is fixed, and a bearing is inserted and fixed in the bracket through a holding tube having a U-shaped cross section, and the lower end of the steering shaft is rotated by the bearing. Freedom to support.

[0003]

[Problems to be solved by the device]

 As shown in FIG. 3, the holding cylinder A is provided with a cut portion B extending from one end of the holding cylinder A in the axial direction to the other end thereof so that the holding cylinder A can be expanded in diameter. The holding cylinder A is preliminarily fitted into the outer peripheral surface of the bearing, and then the holding cylinder A is press-fitted into the bracket.

Therefore, when the holding cylinder A is fitted on the outer circumference of the bearing, a gap D penetrating in the axial direction of the holding cylinder A is generated between the cut surfaces C1 and C2 of the cut portion B which face each other. Therefore, when the holding cylinder A is fitted in the bracket, noise that enters the bracket from the inside of the engine room through the through hole of the dash panel causes the noise in the gap D in the cutting portion B to be increased. There is a problem that is transmitted to the passenger compartment through the vehicle.

The present invention was developed in view of the above circumstances, and it is an object of the present invention to fit the holding cylinder into the outer periphery of the bearing without causing any trouble and to reduce the noise in the engine room. The purpose of the present invention is to provide a support structure for a steering shaft that can reliably prevent the vehicle from entering the vehicle.

[0006]

[Means for Solving the Problems]

 Therefore, according to the present invention, the cutting portion 6 of the holding cylinder 4 is located at an intermediate portion of the axial length of the holding cylinder 4 and extends in the circumferential direction, and increases when the holding cylinder 4 is attached to the outer periphery of the bearing 5. A circumferential direction cutting portion 6a having cutting surfaces 61 and 62 longer than the circumferential length and facing the cutting surfaces 61 and 62, and one end in the axial direction of the holding cylinder 4 from one end in the longitudinal direction of the circumferential cutting portion 6a. Crank composed of a first axial cutting portion 6b extending to the end side and a second axial cutting portion 6c extending from the other end in the longitudinal direction of the circumferential cutting portion 6a to the other axial end of the holding cylinder 4. It is characterized in that it is formed into a shape.

[0007]

[Action]

 According to the present invention, when the holding cylinder 4 is fitted into the outer periphery of the bearing 5, the diameter of the holding cylinder 4 can be easily expanded through the cutting portion 4, so that the bearing of the holding cylinder 4 can be expanded. 5 can be fitted into the outer circumference without any trouble, and even if the holding cylinder 4 is expanded in diameter by mounting the holding cylinder 4 on the bearing 5, the cut surfaces 61 facing each other in the circumferential cutting portion 6a can be formed. -Since part of 62 is always in contact with each other, inside the engine room R1 that enters the bracket 3 through the through hole 10 of the dash panel 1 after the holding cylinder 4 is assembled into the bracket 3. There is no possibility that the noise will be reliably blocked by both the cutting surfaces 61 and 62 of the circumferential cutting portion 6a and will enter the passenger compartment R2.

[0008]

【Example】

 In the drawing, reference numeral 1 denotes a dash panel that divides an engine room R1 and a passenger compartment R2 in an automobile. The dash panel 1 is formed with an insertion hole 10 for a steering shaft 2, and the passenger compartment in the dash panel 1 is formed. A cylindrical bracket 3 surrounding the insertion hole 10 is fixed to the side surface on the R2 side.

A bearing 5 is inserted and fixed in the bracket 3 via a holding cylinder 4, and the lower end of the steering shaft 2 is rotatably supported by the bearing 5.

The bearing 5 includes a plurality of balls 53 interposed between an outer race 51 and an inner race 52.

The holding cylinder 4 is made of a synthetic resin material, and has a cylindrical cylindrical portion 41 that overlaps with the outer peripheral surface of the outer race 51, and extends radially inward from both axial ends of the cylindrical portion 41. And a pair of flanges 42 and 43, which overlap with each other on both axial end surfaces of the outer race 51, respectively, and a plurality of flanges 42 and 43 are formed on the inner side surfaces of the flanges 42 and 43 to engage with the inner peripheral surface of the outer race 51. Engaging projections 44 are provided so as to project.

Therefore, the holding cylinder 4 is provided with a cutting portion 6 cut in a crank shape so that the holding cylinder 4 can be expanded in diameter and can be fitted to the outer periphery of the outer race 51. There is.

That is, the cutting portion 6 is located at an intermediate portion of the axial length of the holding cylinder 4 and extends circumferentially in a straight line in the circumferential direction, and the length of the circumferential cutting portion 6a. A first axial cutting portion 6b extending from one end in the axial direction to one axial end of the holding cylinder 4, and a second axial cutting portion 6b extending from the other longitudinal end of the circumferential cutting portion 6a to the other axial end of the holding cylinder 4. A circumferential length that increases when the holding cylinder 4 is attached to the outer circumference 51 of the outer race 51 is formed by the axial cutting portion 6c, and the lengths of the facing cutting surfaces 61 and 62 formed by the circumferential cutting portion 6a increase. Even if the holding cylinder 4 is fitted into the outer race 51 and a gap S is generated in the first and second axial cutting portions 6b and 6c as shown in FIG. Part of the cut surfaces 61 and 62 are always in contact with each other.

In the steering shaft support structure having the above-described configuration, the holding cylinder 4 is fitted to the outer periphery of the bearing 5 in a state where the diameter of the holding cylinder 4 is expanded via the cutting portion 6, and the cylindrical portion 41 is formed. On the outer peripheral surface of the outer race 51, the flanges 42 and 43 on the left and right side surfaces of the outer race 51, respectively, and the engagement protrusions 44 are engaged on the inner peripheral surface of the outer race 51. ..

Then, the holding cylinder 4 into which the bearing 5 is fitted as described above is press-fitted into the bracket 3, and then the bracket 5 is fixed to the side surface of the dash panel 1 on the passenger room R2 side, and the bearing 5, the lower end of the steering shaft 2 is rotatably supported.

Thus, even if the clearance S is generated in the first and second axially cut portions 6b and 6c by the assembling of the holding cylinder 4 to the outer periphery of the bearing 5, as shown in FIG. Since both of the cutting surfaces 61 and 62 of the circumferential cutting portion 6a are always in contact with each other, noise in the engine room R1 that enters the bracket 3 through the through hole 10 of the dash panel 1 is generated. However, there is no possibility that it will be reliably cut off by the two cutting surfaces 61 and 62 of the circumferential cutting portion 6a that are in contact with each other and that it will enter the passenger compartment R2.

In the above embodiment, the engagement protrusions 44 formed on the inner side surfaces of the flanges 42 and 43 are engaged with the inner peripheral surface of the outer race 51, so that the bracket 3 of the holding cylinder 4 is engaged. At the time of press-fitting into the inside, the flanges 42 and 43 do not roll up outward in the radial direction.

[0018]

[Effect of the device]

 As described above, according to the present invention, the cutting portion 6 of the holding cylinder 4 is located at an intermediate portion of the axial length of the holding cylinder 4 and extends in the circumferential direction, and increases when the holding cylinder 4 is attached to the outer circumference of the bearing 5. Has a cutting surface 61/62 longer than the circumferential length thereof, and the cutting surface 61/62 is in contact with the circumferential cutting portion 6a, and the axial direction of the holding cylinder 4 from one end in the longitudinal direction of the circumferential cutting portion 6a. A first axial direction cutting portion 6b extending toward the one end side and a second axial cutting portion 6c extending from the other end in the length direction of the circumferential cutting portion 6a to the other end side in the axial direction of the holding cylinder 4. By forming the holding cylinder 4 into the outer circumference of the bearing 5, it is possible to expand the diameter of the holding cylinder 4 through the cutting portion 4 by fitting the holding cylinder 4 to the bearing of the holding cylinder 4. 5 can be fitted into the outer circumference without any trouble, and the holding cylinder 4 is assembled to the bearing 5 so that the holding Even when the diameter of the cylinder 4 is expanded, some of the facing cutting surfaces 61 and 62 of the circumferential cutting portion 6a are always in contact with each other, so that after the holding cylinder 4 is assembled into the bracket 3, Noises in the engine room R1 that enter the bracket 3 through the through holes 10 of the dash panel 1 are reliably blocked by the both cutting surfaces 61 and 62 of the circumferential cutting portion 6a, and the interior of the passenger compartment R2. There is no danger of invading into the cabin, so it is possible to ensure the quietness in the cabin.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a steering shaft support structure according to the present invention.

FIG. 2 is a perspective view of a holding cylinder in a diameter expanded state.

FIG. 3 is a perspective view of a conventional holding cylinder.

[Explanation of symbols]

 1 Dash Panel 10 Insertion Hole 2 Steering Shaft 3 Bracket 4 Holding Tube 5 Bearing 6 Cutting Section 6a Circumferential Cutting Section 6b First Axial Cutting Section 6c Second Axial Cutting Section 61/62 Cutting Surface

Claims (1)

[Scope of utility model registration request] 1. A dash panel 1 having an insertion hole 10 for a steering shaft 2 is provided with a cylindrical bracket 3 surrounding the insertion hole 10, and a cutting portion 6 is provided in the bracket 3 so that the diameter can be increased. In the support structure of the steering shaft in which the bearing 5 is inserted and fixed through the holding cylinder 4 and the steering shaft 2 is rotatably supported by the bearing 5, the cutting portion 6 of the holding cylinder 4 is replaced by the holding cylinder 4 Has a cutting surface 61/62 extending in the circumferential direction at an intermediate portion of the axial length of the holding cylinder 4 and extending longer when the holding cylinder 4 is mounted on the outer circumference of the bearing 5, and the cutting surface 61/62 has a length longer than the circumferential length. Are in contact with each other, a first axial cutting portion 6b extending from one end in the longitudinal direction of the circumferential cutting portion 6a to one end in the axial direction of the holding cylinder 4, and a length of the circumferential cutting portion 6a. From the other end in the axial direction to the axial direction of the holding cylinder 4, etc. Second axial cutting portion 6c extending to the end side
A support structure for a steering shaft, characterized in that it is formed in a crank shape.