JP2520038Y2 - Nut seat bush for aluminum wheels - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum wheel nut seat bush (hereinafter simply referred to as a bush) for reinforcing a nut seat formed in a hub bolt hole of an aluminum wheel.

[0002]

2. Description of the Related Art Conventionally, in an automobile wheel made of an aluminum alloy, when the wheel is attached to the automobile, a hub bolt hole of the wheel is fitted into a hub bolt and is fixed by a hub nut.

However, in the above-mentioned mounting method, the hub nut crushes the aluminum wheel due to insufficient rigidity of the aluminum alloy, so that the aluminum wheel cannot be securely fixed.

Therefore, as shown in FIGS. 5 and 6, when a bush 15 having high rigidity is fitted into the nut seat 14 of the hub bolt hole 13 of the aluminum wheel and the hub nut is tightened,
The one that is configured so that it can be securely tightened and fixed, and
It is composed of a head portion 18 and a cylindrical portion 19 as shown in FIG.
Tightening seat tab formed with a ridge 20 that is vertically cut on the outer surface of 19
There is a shush 21. (Japanese Utility Model Publication No. 51-120464)

[0005]

[Problems to be solved by the invention] As described above, the nut seat
In the case where the bush 15 is fitted in the 14, the apex XX of the nut seat 14 before the bush 15 is fitted is shown in FIG.
Distance a, disk flat portion 16 to nut seat 14 apex X
Height b up to disk flat 16 to bottom of nut seat 14
The height h up to 17 and the respective dimensions a ′, b ′, h ′ after the bush 15 is fitted as shown in FIG. 6 are a = a ′, b
= B ', h = h'so that the bush comes out when the wheel is removed, and the tightness of the bush and nut seats reduces the tightening torque of the wheel nut, There was a problem that it causes the loosening. Further, the ridges 20 are formed on the outer surface of the cylindrical portion 19.
The bush 21 with the
21 can be prevented from rotating, but the bush
The wheel cannot be replaced because it cannot be prevented from coming off in the axial direction.
At the same time, if a shock is applied to the bush, the bush will come off.
The bushing may be
There was a problem that it was loosened.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems and prevent the bush from coming off or rotating. The nut seat bush for an aluminum wheel is a head portion. The inner peripheral surface has a nut seat, the lower portion has a body portion that fits into a hub bolt hole of an aluminum wheel, and a circumferential groove is formed between the head portion and the body portion.
The outer peripheral surface of the body has a large number of grooves
The depth of the groove in the circumferential direction above the depth of the groove.
It is characterized by being formed .

[0007]

[Function] Since the bush of the present invention is press-fitted so that the nut seat is plastically processed when it is mounted on the aluminum wheel, the excess thickness of the nut seat part of the plastically processed aluminum wheel is Bite into the groove provided in 1,
Since the bush 1 is attached at a predetermined position without being pushed back, the close contact between the bush and the nut seat becomes very high. Therefore, the bush is prevented from coming off, and the decrease in the tightening torque of the wheel nut is eliminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, 1 is at the top,
It has a head portion provided with a spherical or tapered nut seat 2 on the inner peripheral surface of the head portion, and has a body portion 3 fitted at a lower portion into a hub bolt hole provided in a disc of an aluminum wheel, and is made of iron,
It is a hollow bush made of highly rigid material such as steel and alloy.

The lower surface 4 of the head portion of the bush 1 is formed as an inclined surface having substantially the same angle as the nut seat of the hub bolt hole provided in the disk.

Further, a circumferential groove 6 is provided between the head of the bush 1 and the body portion 3 to form a neck portion 5, and the outer peripheral surface of the body portion 3 is oriented vertically. A large number of grooved grooves 7 are formed at substantially equal intervals. Above the circumference
The depth C of the facing groove 6 is the depth D of the groove 7 as shown in FIG.
It is formed to be deeper.

The outer diameter of the body portion 3 of the bush 1 is slightly larger than the inner diameter of the hub bolt hole of the disk.

Next, the bush 1 constructed as described above.
A method of attaching the to the hub bolt hole provided in the disc of the aluminum wheel will be described with reference to FIGS. 3 and 4.

Reference numeral 8 is a disc of an aluminum wheel, in which a hub bolt hole 10 having a nut seat 9 is formed. When the bush 1 is press-fitted into the hub bolt hole 10,
The extra thickness of the disk 8 is embedded in the groove 6 provided in the bush 1 and the groove 7 , respectively.

That is, as shown in FIG. 3, the distance A between the apexes P and P of the nut seat 9 of the disc 8 before the bush 1 is press-fitted, the height B of the disc 8 from the plan view 11 to the apex P,
The height H from the flat surface portion 11 of the disk 8 to the bottom portion 12 of the nut seat 9 is such that the respective distances A ', heights B'and H'after press-fitting the bush 1 are A <A as shown in FIG. ', B>
B'and H> H '.

As described above, the hub bolt hole 1 of the disk 8
When the pull-out resistance of the bush 1 pressed into 0 was measured, the results shown in Table 1 were obtained.

The measurement is performed by pushing up the lower surface of the bush 1 and measuring the resistance force until the bush 1 comes out of the hub bolt hole 10, and the conventional product is the resistance force measured by the one shown in FIG.

[0018]

[Table 1]

As is clear from Table 1, the bush of the present invention has about three times as much pull-out resistance as that of the conventional bush in which the ridge is simply provided on the outer peripheral surface.

The reason why the conventional bush has a small pull-out resistance is that when the bush is pressed in, the bush is pushed back by the repulsive force of the disk and does not enter the predetermined position, and the contact area between the bush and the hub bolt hole becomes small. It is thought to be a tame. On the other hand, in the bush of the present invention,
When press-fitting the bush, insert the body between the head and the body of the bush.
The deepest groove of the groove
Since the surplus of the disc bites into the part, the surplus of the disc
Engage with the step of the groove. Because of this, the bush is pushed back
It is attached at a predetermined position without being removed, and has a large pull-out resistance.

As described above, if the bush does not reach the predetermined position, a gap is created between the lower surface of the head of the bush and the nut seat of the disk. When used in this state, the bush is usually made of a material with high rigidity such as iron and steel, and the disc is made of a soft material such as aluminum and aluminum alloy. The bush moves subtly by the force and impact force from all directions applied, gradually expanding and deforming the hub bolt hole of the disk.

As a result, the pitch circle diameter of the nut bearing surface of the disk changes, which causes the nut to loosen, and causes the bush to fall off when the wheel is removed.

In the bush of the present invention, the bush is attached at a predetermined position, and the excess thickness is embedded in the groove provided in the neck portion of the bush, so that the bush is more resistant to coming off in the axial direction. At the same time, since the gripping force is increased so as to crimp in the radial direction, the bush can be prevented from changing and the hub bolt hole is not deformed.

[0024]

According to the present invention, since the nut seat of the disc is press-fitted until it is plastically deformed, the close contact between the bush and the nut seat of the disc becomes very high, and moreover, the groove of the bush neck and the body Since the aluminum material of the disc bites into each groove, the gripping force of the bush is improved several times.

In addition, when the wheel is replaced, even if a shock is applied to the bush, the bush can be completely prevented from coming off,
The wheel nut can be tightened and fixed securely by tightening.

Further, since the torque reduction of the wheel nut is eliminated and the nut is not loosened while the vehicle is running, it has an excellent practical effect such as the safety of the vehicle is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a bush of the present invention.

FIG. 2 is a front view showing an embodiment of the bush of the present invention.

FIG. 3 is a partially cutaway sectional view showing a state before the bush is press-fitted according to the present invention.

FIG. 4 is a partially cutaway sectional view showing a state after press-fitting the bush of the present invention.

FIG. 5 is a partially cutaway sectional view showing a state before a conventional bush is attached.

FIG. 6 is a partially cutaway sectional view showing a state after a conventional bush is attached.

[Figure 7] It is sectional drawing of the conventional bush.

[Explanation of symbols]

1, 15 Bushing 2, 9, 14 Nut seat 3 Body 4 Lower surface 5 Neck 6 Groove 7 Groove 8 Disc 10, 13 Hub bolt hole 11, 16 Disc flat 12, 17 Nut seat bottom 18 Head 19 Cylindrical 20 Ridge 21 Tightening seat Bush

Claims (1)

(57) [Scope of utility model registration request] 1. A head portion having a nut seat on the inner peripheral surface of the head portion, and a lower portion having a body portion fitted into a hub bolt hole of an aluminum wheel, and between the head portion and the body portion. A groove is formed in the circumferential direction to form the neck part, and a number of longitudinal grooves are provided on the outer peripheral surface of the body in the longitudinal direction to make the depth of the groove deeper than the depth of the groove.
A nut seat bush for aluminum wheels that is characterized by being formed into a new shape .