JP2557836Y2 - Multi-piece rim - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel rim, and more particularly to a multi-piece rim composed of a plurality of pieces.

[0002]

2. Description of the Related Art Multi-piece rims are sometimes used for wheel rims of large vehicles. A typical example of a conventional multi-piece rim is shown in FIG.
As shown in FIG. In the multi-piece rim shown in FIG.
The radius of the corner of the lock ring groove 104 is small, and the contact surface of the lock ring groove 104 with the lock ring 106 is substantially perpendicular to the rim axis. In the multi-piece rim shown in FIG. 4, the radius of the corner of the lock ring groove 114 of the gutter band 112 is large, and the contact surface of the lock ring groove 114 with the lock ring 116 is inclined at an angle of approximately 45 ° with the rim axis. .

[0003]

However, the conventional multi-piece rim has the following problems. First, in the multi-piece rim of the type shown in FIG. 3, since the radius of the corner of the lock ring groove 104 is small, stress is concentrated on the corner, and fatigue cracks are likely to occur. In the case of a multi-piece rim of the type shown in FIG.
4, the stress concentration at the corners was reduced and the gap d between the lock ring 116 and the gutter band 112 was present (see FIG. 4). It is easy to move in the direction of. for that reason,
Fretting fatigue occurs between the lock ring 116 and the gutter band 112, which may lead to cracking.

An object of the present invention is to provide a multi-piece rim which can reduce stress concentration at a corner R of a lock ring groove and can suppress fretting fatigue due to movement of the lock ring.

[0005]

The above object is achieved according to the present invention by providing a multi-piece rim having the following means. A gutter band in which a lock ring groove having a first slope inclined at a range of 50 ° or more and less than 70 ° with respect to a rim axis is disposed outside the gutter band; A bead seat band having a second slope inclined at an angle smaller than that of the first slope, wherein an angle between the first slope and the second slope is set to 5 ° or more and 40 ° or less; A portion disposed between the gutter band and the bead seat band and pressed between the first slope and the second slope to protrude into the lock ring groove and protrude into the lock ring groove; A lock ring having a height smaller than the depth of the lock ring groove; and a side ring disposed outside the bead seat band.

[0006]

The lock ring receives a force directed obliquely inward by being pinched by two slopes forming an angle of not less than 5 ° and not more than 40 °, that is, the first slope and the second slope. Since the height of the groove entry part of the lock ring is smaller than the depth of the lock ring groove, when the lock ring receives a diagonally inward force, the inner peripheral surface of the outer part of the groove of the lock ring adheres to the outer peripheral surface of the gutter band. , The movement of the lock ring can be stopped. Therefore, fretting fatigue is suppressed. Further, since the lock ring groove is connected to the corner from the first slope, the radius of the corner is large, and stress concentration is reduced.

[0007]

FIG. 2 shows an entire wheel having a multi-piece rim according to an embodiment of the present invention. The wheel 2 comprises a rim 4 and a disk 6 welded to its inner periphery, and is fixed to the axle by the disk 6.

The rim 4 is composed of a plurality of pieces and is a so-called multi-piece rim. The multi-piece rim 4 includes a gutter band 8 at one end of a rim base, a lock ring 10, a bead seat band 12, and a side ring 14, and an O-ring sealing member 16 is interposed between the bead seat band 12 and the gutter band 8. .

The gutter band 8 has a lock ring groove 18 formed on the outer circumference over the entire circumference. Further, a lock ring groove 18 is provided on the outer peripheral portion of the gutter band 8.
An O-ring groove 20 is formed further inside in the axial direction.

The lock ring groove 18 is provided in the lock ring 10.
First slope 18 extending diagonally outwardly, in contact with
a, R connecting the first slope 18a and the groove bottom 18c.
It has a portion 18b. The radius of curvature of the R portion 18b is the conventional
Is much larger than the R of the corner of the lock ring groove of the rim type (for example, R ≧ groove depth), and the stress concentration is small even under load.

The lock ring 10 is formed of a ring having one cut in the circumferential direction. The lock ring 10 is mounted on the outer periphery of the gutter band with a part thereof protruding into the lock ring groove 18. The lock ring 10 has a first slope 18 of a lock ring groove 18.
a of slope 10a and bead seat band 12
Has a slope 10b in contact with the slope 12a. The lock ring 10 has an inner peripheral surface 10c that is parallel to the outer peripheral surface of the gutter band 8.

The height h (see FIG. 1) of the lock ring groove protruding portion of the lock ring 10 is smaller than the depth H of the lock ring groove 18. That is, h <H. Therefore, if the lock ring 10 receives a radially inward force,
The inner peripheral surface 10 c of the portion of the lock ring 10 outside the gutter band outer peripheral surface comes into contact with the outer peripheral surface 8 a of the gutter band 8.

The bead seat band 12 is a member constituting the seating surface of the tire bead, and is disposed on the outer peripheral side of the gutter band 8. Bead seat band 12 and gutter band 8
Is sealed by an O-ring 16 so as not to release the tire air pressure. Alternatively, a tube may be used and the O-ring may be omitted. The bead seat band 12 has a second inclined surface 12a extending obliquely outward at an axially outer end of the inner peripheral surface. The second slope 12a faces the first slope 18a of the lock ring groove 18 of the gutter band 8, and the lock ring 10 is held between the first slope 18a and the second slope 12a.

The inclination angle θ ₁ of the first slope 18 a of the lock ring groove 18 with respect to the rim axis is determined by the lock ring groove R portion 1.
It is desirable to set the angle to be in the range of 50 ° or more and less than 70 ° so that the length of the linear inclined surface 12a is larger than 8b, but the required length is also required.

The second slope 12 of the bead seat band 12
inclination angle theta ₂ with respect to the rim axis of a is, first inclined surface 18a
Smaller than the inclination angle theta _1, a θ ₂ <θ _1. And
Angle θ between first slope 18a and second slope 12a =
θ ₁ −θ ₂ is set to 5 ° or more and 40 ° or less. 5 ° ≦ θ = θ ₁ −θ ₂ ≦ 40 °

Since the second slope 12a and the first slope 18a are not parallel to each other and θ> 0, a lock ring is formed so that a surface pressure is applied to both side surfaces of the wedge and a force for pushing the wedge backward is generated. A force (in a direction indicated by an arrow in FIG. 1) acts on the inner side in the radial direction of the wheel and toward the inner side in the axial direction.

The reason why θ is set to 5 ° or more is that if θ is smaller than 5 °, and if the friction coefficient is set to about 0.1, the first slope 18a,
This is because the frictional force between the second inclined surface 12a and the lock ring 10 is larger than the pressing force of the wedge, and the lock ring 10 does not smoothly contract inward in the radial direction. Also, θ
Is set to 40 ° or less because if it is larger than 40 °, the stress concentration on the constricted portion of the lock ring 10 increases, and the strength of the lock ring 10 is reduced.

The bead seat band 12 has a flange portion 12b extending radially outward at an end thereof, and receives the side ring 14 on its axially inner side surface. A part of the bead seat band 12 where the tire bead is seated is subjected to a knurling process (a process of making a knurl), so that circumferential slippage between the tire and the bead seat band 12 may be prevented. .

The rim 4 is provided with the side ring 14 at one end in the axial direction, and the other side ring 2 at the other end.
2 are provided. The force for pushing and expanding the tire bead in the axial direction by the tire pressure is applied to the side rings 14 and 22.
The axial force applied to one side ring 14 is received by the gutter band 8 via the flange portion 12 b of the bead seat band 12, the lock ring 10, and the lock ring groove 18, and the axial force applied to the other side ring 22. Is received by the flange portion 24 of the rim base formed at the end opposite to the gutter band of the rim base.

The radial load applied to the tire, such as the contact pressure, is applied to the gutter band 8 from the tire bead via the bead seat band 12 and the lock ring 10 at one end in the rim axial direction.
At the other end in the rim axial direction, from the tire bead to the bead seat portion of the rim, and is received by the bead seat portion. And the load of the rim 4 is
Finally, it is received on the axle via the disk 6.

Next, the operation will be described. When a load is applied from the tire to the multi-piece rim, the lock ring 10 is pressed by the first slope 18a of the lock ring groove 18 of the gutter band 8 and the second slope 12a of the bead seat band 12, and the lock ring 10 Is pushed diagonally inward in the radial direction.

Since the lock ring 10 has a cut in the circumferential direction so as to fit over the gutter band 8 and fit into the lock ring groove 18, it is reduced in diameter when pushed inward in the radial direction. As a result, the inner peripheral surface 10c of the lock ring 10 on the outer peripheral side of the gutter band 8 is in close contact with the outer peripheral surface 8a of the gutter band 8. Therefore, there is no gap between the inner peripheral surface 10c of the lock ring 10 and the gutter band outer peripheral surface 8a, and the lock ring 10 does not rattle. Therefore, fretting fatigue is eliminated.

Further, the lock ring groove 18 has a first slope 18a, which is connected to the R portion 18b having a large radius.
The stress concentration of b is greatly reduced as compared with the conventional multi-piece rim (for example, the multi-piece rim in FIG. 3). For this reason, even if repeated stress is applied, the risk of crack generation, crack growth, and fatigue fracture is greatly reduced.

[0024]

According to the present invention, the first of the lock ring grooves is provided.
Angle between the slope of the bead seat band and the second slope of the bead seat band is set to 5 ° or more and 40 ° or less, and the height of the lock ring groove entry portion of the lock ring is set to be smaller than the lock ring groove depth. As a result, when a load is applied from the tire, the lock ring is pushed obliquely inward in the radial direction, and the inner surface of the lock ring on the outer peripheral side of the gutter band can adhere to the outer peripheral surface of the gutter band, and the lock ring does not rotate. And fretting fatigue can be prevented.

Further, a first inclined surface is provided in the lock ring groove, and the inclination angle with respect to the rim axis is not less than 50 ° and 70 °.
Since the angle is set within the range of less than °, the radius of the R portion at the transition from the first slope to the groove bottom can be increased, the stress concentration can be reduced, and fatigue fracture can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a multi-piece rim according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a wheel having a multi-piece rim according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of an example of a conventional multi-piece rim.

FIG. 4 is a partial cross-sectional view of another example of a conventional multi-piece rim.

[Explanation of symbols]

 Reference Signs List 4 rim 8 gutter band 10 lock ring 12 bead seat band 14 side ring 16 sealing material 18 lock ring groove 20 O-ring groove 18a first slope 12a second slope

Claims (1)

(57) [Scope of request for utility model registration] 1. A rim axis center of which is not less than 50 ° and 70 ° or more.
A gutter band in which a lock ring groove having a first slope inclined to a range of less than 0 ° is formed; and a gutter band disposed outside the gutter band and inclined at an angle smaller than the first slope with respect to a rim axis. A bead seat band having a second slope and an angle between the first slope and the second slope set to 5 ° or more and 40 ° or less; and between the gutter band and the bead seat band. The lock ring groove has a portion that is disposed and is pressed between the first slope and the second slope and that protrudes into the lock ring groove. The height of the portion that protrudes into the lock ring groove is the height of the lock ring groove. A multi-piece rim, comprising: a lock ring set to be smaller than a depth; and a side ring disposed outside the bead seat band.