JPH0421681Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a wheel step for a vehicle that is attached to the wheels of a truck or the like.

[Prior art]

Wheel steps of vehicles such as trucks are usually fitted with wheel steps along the outer surface of the disc wheel, as shown in FIG. FIG. 2 is a cross-sectional view showing how the wheel step is attached to the disc wheel, and shows only the area above the wheel axis. Note that the direction indicated by A in FIG. 2 is the outer side of the wheel. In the above figure, the steering knuckle part 1 has a bearing 2.
The hub 3 is inserted through. A brake drum 4 is provided on the inner and outer surfaces of the wheel of the hub 3, respectively.
A wheel step 6 made of mild steel and pressed into a substantially annular shape is attached to the outer surface of the disc wheel 5, and these four parts, that is, the hub 3, the brake drum 4, and the disc wheel 5 and the wheel step 6 are tightened together with a hub bolt 7 and a wheel nut 8, and are integrally tightened and fixed. in this case,
The nut abutment surface of the wheel step 6 is machined into a spherical surface to match the shape of the abutment surfaces of the wheel nut 8 and disc wheel 5, and the spherical surface is also used for centering the wheel step 6.

[Problem that the invention attempts to solve]

However, in the conventional wheel step mounting structure described above in which the brake drum 4, hub 3, disc wheel 5, and wheel step 6 are fastened together with the hub bolt 7 and wheel nut 8, only the wheel step 6 is made of low-strength mild steel. However, there is a drawback that the hub nut 8 loosens due to plastic deformation of the wheel step.

As a device for the wheels of a vehicle, there is a "vehicle disc brake device" in Utility Application No. 56-61918, which the present applicant previously filed, but even in the earlier application, the above-mentioned drawbacks were not solved. I haven't reached it yet.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a wheel step that can be attached to a hub, a disc wheel, etc. without having to be tightened together.

[Means for solving problems]

In order to solve the above problem, the inner circumferential surface of the hole formed in the center of the disc wheel is fitted to the outer circumferential surface of the disc-shaped convex part on the outer side of the hub, and a hub bolt is attached to the outer circumferential part of the hub. In a wheel step having an outer circumferential portion fixed and held by a hook bolt to the disk wheel which is tightened and fixed with a wheel nut, the inner circumferential surface of the hole of the disk wheel is attached to the inner circumferential portion of a hole formed in the center of the wheel step. a bent portion that fits into a portion protruding outward from the disk-shaped convex portion of the hub, a flat portion that comes into contact with an outer flat portion of the disc wheel, and a flat portion of the wheel step that fits the wheel; It is characterized by having a wheel nut through hole that is larger than the outer diameter of the nut.

[Effect]

By configuring the wheel step as described above, it is possible to center the wheel step simply by fitting the outer diameter surface formed by bending the inner circumference of the wheel step into the inner diameter surface of the disc wheel. There is no need to tighten the disc wheel together with the disc wheel, and loosening of the wheel nut can therefore be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1a is a sectional view showing the state in which the wheel step according to the present invention is attached to the wheel portion, and is a view showing only the portion above the wheel axis. 1st
Figure b is an enlarged view of part B of Figure 1a. Note that the first
The direction indicated by C in figure a is the vehicle outer side of the wheel.

In the above figure, a bent portion 11 bent toward a hub 13 is provided at the inner peripheral portion of a hole formed in the center of a wheel step 10 formed in an annular shape. The outer diameter of the bent portion 11 is approximately equal to the inner diameter of the disc wheel 12, and the bending dimension of the bent portion 11 is an appropriate amount smaller than the thickness of the disc wheel 12 minus the fitting step provided on the hub 13. small. The hole 14 is a generally circular hole drilled in the wheel step 10. The diameter of the hole 14 is sufficiently larger than the diameter of the wheel nut 15, and the number of holes 14 corresponds to the number of hub bolts 16 equally spaced on the circumference. Further, the center of the hole 14 and the center of the hub bolt 16 substantially coincide with each other when the outer diameter surface of the bent portion 11 is properly fitted to the inner diameter surface of the disc wheel. At the outer peripheral corner of the wheel step 10 there is a first
As shown in a partial perspective view in FIG. c, two or more suitable numbers of recesses 17 are formed by pressing or the like, and the bottom back surface of the recesses 17 is configured as a wheel step tightening seat 18. A wheel step mounting hole 19 is bored in the wheel step tightening seat 18. Numeral 20 is a hook bolt for attaching the wheel step 10 to the disc wheel 12, and the U-shaped portion of the hook bolt 20 is attached to the disc wheel 12 using a hole 21 that is normally drilled in the disc wheel 12 as shown in the figure. be hooked. The threaded portion of the hook bolt 20 is inserted into the wheel step mounting hole 19, and a nut 22 is screwed into it from the outside of the vehicle. The recess 17 is provided at a position where the wheel step 10 can be fixed with the hook bolt 20 using the hole 21 of the disc wheel as described above. Further, the inclination of the wheel step tightening seat 18 with respect to the wheel axis is formed at an angle that allows proper tightening when the hook bolt 20 is used as described above.

The embodiment of the present invention is constructed as described above, and when attaching the wheel step 10 to the disc wheel 12, first the wheel nut 1 is attached.
Attach the wheel step 10 to the outer surface of the disc wheel 12 so that all numbers 5 protrude from the hole 14, and at the same time fit the outer diameter surface of the bent portion 11 of the wheel step to the inner diameter surface of the disc wheel 12. Perform centering. Next, hook the U-shaped portion of the hook bolt 20 into the hole 21 of the disc wheel 12, pass the threaded portion through the wheel step mounting hole 19, and tighten the nut 22.
As a result of the above, the wheel step 10 is fixed and held concentrically with the disc wheel 12 without being tightened together with the disc wheel. In addition, since the disc wheel 12 and the wheel step 10 are fitted to each other on the inner and outer diameter surfaces, there is no deviation in the radial direction.
Therefore, even if there is unevenness in the tightening force of the plurality of hook bolts 20, the wheel step 10 will not shift in the radial direction. Furthermore, since the height of the bent portion of the wheel step is set to a height that provides the minimum necessary in-roller allowance, one type of wheel step can be used for disks of various thicknesses.

[Effect of idea]

As explained above, according to the present invention, the following excellent effects can be obtained.

(1) In a wheel step configured to fix and hold the outer periphery of the disc wheel with a hook bolt, a bent part of the inner periphery of the hole formed in the center of the wheel step is formed, and a bent part is formed in the center of the disc wheel. The wheel nut is inserted into the inner circumferential surface of the hole that has been inserted, and a wheel nut through hole larger than the outer diameter of the wheel nut is drilled in the flat part of the wheel step, so there is no need to tighten the wheel step and disc wheel together. This prevents the wheel nut from loosening due to plastic deformation of the wheel step.

(2) In addition, the wheel step of the present invention positions the bent part by contacting the inner circumferential surface of the hole formed in the center of the disk wheel, which has good accuracy, so positioning accuracy is improved, and the wheel step is pulled and rotated. The body (disc wheels, tires) is well-balanced, and vibrations when the vehicle is running can be suppressed.

[Brief explanation of drawings]

Figure 1a is a cross-sectional view showing the embodiment of the present invention installed on a wheel, showing only the upper part of the wheel. Figure 1b is an enlarged view of section B in Figure 1a. Figure c is a partial perspective view showing the recess 17 provided on the outer periphery of the wheel step, and Figure 2 is a diagram showing a conventional wheel step mounting structure.
FIG. 3 is a cross-sectional view showing only the area above the wheel axis. 10...Wheel step, 11...Bending part,
12...Disc wheel, 13...Hub, 14
... Hole, 15 ... Wheel nut, 16 ... Hub bolt, 17 ... Recess, 18 ... Wheel step tightening hole, 19 ... Wheel step mounting hole, 2
0... Hook bolt, 21... Hole, 22... Nut.

Claims (1)

[Claims for Utility Model Registration] The inner circumferential surface of a hole formed in the center of the disc wheel is fitted to the outer circumferential surface of a disc-shaped convex portion on the outer side of the hub, and a hub bolt is attached to the outer side of the hub. In a wheel step configured such that the outer periphery is fixed and held by a hook bolt to the disc wheel that is tightened and fixed with a wheel nut, the inner periphery of the hole of the disc wheel is attached to the inner periphery of a hole formed in the center of the wheel step. forming a bent portion that fits into a portion of the surface that protrudes outward from the disc-shaped convex portion of the hub; forming a flat portion that abuts the outer flat portion of the disc wheel; A wheel step for a vehicle characterized by having a wheel nut through hole larger than the outer diameter of the wheel nut.