JPH08132801A - Two-piece wheel - Google Patents

Abstract

PURPOSE: To provide a wheel having a large storage space capable of storing a braking device on the inner side with high accuracy and prevent cracks from being generated on a well section by a load or the like at the time of a travel. CONSTITUTION: The well section 20 of a two-piece wheel integrally connected with a rim and a disk formed separately is continuously formed with a small- diameter section slightly wider in width than one of bead seat sections 17, 18 and nearly equal in diameter, a taper section 22 expanded outward in the radial direction at a small angle toward the outer direction from the small- diameter section, and a large-diameter section nearly equal in diameter and shorter in width toward the outer direction from the taper section. A step section 24 outward in the radial direction is formed at the inner peripheral end section on the outer side of the large-diameter section, a step section 27 bent inward in the radial direction is formed at the outer peripheral end section on the inner side of the leg section 26 of a disk 25, and the step section 20 of the disk 25 is coupled with the step section 27 of a rim from the outer side to be integrally fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-piece wheel in which a separately formed rim and disc are integrally connected.

[0002]

2. Description of the Related Art As a conventional technique, an actual Kaihei 6-6500 is used.
There was a publication No. 3, that is, a structure shown in FIG. In FIG. 2, reference numeral 1 denotes a wheel made of an aluminum alloy, which is formed by integrally fixing a cylindrical rim 2 and a disc-shaped disc 10 which are separately formed by welding. The rim 2 has a bead seat portion 3 and 4 on the left portion on the inner side and a right portion on the outer side, and a well portion 5 having a diameter smaller than that of the bead seat portions 3 and 4 at the center portion in the width (left and right) direction. , Well part 5
Has its left half portion formed in the small diameter portion 6 and its right half portion formed in the large diameter portion 7, and both the small diameter portion 6 and the large diameter portion 7 are approximately 45 in the radial direction.
It is connected by a bending portion 8 that bends at an angle of degrees.

Further, the disk 10 has a leg portion 11 formed by bending the outer peripheral portion thereof in a taper shape having a large diameter toward the left (inner direction), and the left end outer periphery of the leg portion 11 is cut out. To form a thin fitting leg 12. Then, the fitting leg 12 is fitted to the inner peripheral surface of the right end of the large diameter portion 7 of the well portion 5, and the left ends of both fitting portions are welded 13. As a result, the wheel 1 having the large accommodation space 14 in which the braking device can be accommodated is formed on the inner side.

[0004]

In the above-mentioned conventional device, the disk 10 is connected to the right end of the large diameter portion 7 of the well portion 5, and the shaft center is provided to the left of the large diameter portion 7 of the well portion 5 at a large bending angle. Since the bending portion 8 that bends in the direction was present, the disk 10
There is a defect that stress is concentrated on the bent portion 8 due to a load received from the side and a crack is generated on the bent portion 8 due to repeated loading during traveling. It is an object of the present invention to obtain a novel two-piece wheel that overcomes the above drawbacks.

[0005]

The present invention is configured as follows to achieve the above object. That is, a bead seat portion is provided on the inner and outer sides, a cylindrical rim having a well portion having a diameter smaller than that of the bead seat portion is provided at an intermediate portion, and a leg portion which is tapered to expand toward the inner portion is provided at an outer peripheral portion. A disc is provided, and the leg portion of the disc is fitted into the well portion of the rim and integrally fixed.
In the peace wheel, the well portion has a small diameter portion that is slightly wider than the width of one of the bead seat portions and has a substantially equal diameter, and expands radially outward from the small diameter portion at a small angle in the outer direction. Forming a tapered portion and a large diameter portion having an end width that is substantially equal in diameter in the outer direction from the tapered portion, and is formed radially outward at the outer side inner peripheral end portion of the large diameter portion. A step portion that bends inward is formed, and a step portion that bends inward in the radial direction is formed on the inner side outer peripheral end of the leg portion of the disc, and the step portion of the disc is attached to the step portion of the rim on the outer side. It is configured to be fitted and integrally fixed. The well portion has a small diameter portion that is slightly wider than the width of one of the bead seat portions and has a substantially equal diameter, and expands radially outward from the small diameter portion at an angle of 15 degrees or less in the outer direction. A taper portion to be opened and a large-diameter portion having an end width that has a substantially equal diameter from the taper portion toward the outer direction are continuously formed, and a radially outer portion is formed at an outer side inner peripheral end portion of the large-diameter portion. The configuration is such that a step portion that bends toward one side is formed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention. In FIG. 1, reference numeral 15 is a two-piece wheel made of an aluminum alloy, and a cylindrical rim 16 and a disk 25 are integrally fixed by welding.
The rim 16 includes bead seat portions 17 and 18 to which a bead portion (not shown) of a tire fits on the inner side on the left side and the outer side on the right side, and the bead seat portion on the middle portion in the left-right (width) direction. Well part 2 with a smaller diameter than parts 17 and 18
0 is integrated into each.

The well portion 20 has a small diameter portion 21, a taper portion 22 and a large diameter portion 23 which are continuously formed from the left portion (inner) side toward the right portion (outer) side. That is, the small-diameter portion 21 is formed to have a normal recess amount, for example, a small diameter of 28.6 mm with respect to the outer diameter of the bead seat portions 17 and 18, and the width W2 thereof is smaller than the normal width. It is formed so as to be slightly wider than the width W1 of the portion 17 (18). Further, the taper portion 22 has a small diameter portion 2
From the right end of 1 to the right, it is expanded radially outward.
The taper angle α of the taper portion 22 is 10 degrees in this example. According to experiments, this taper angle α is preferably 8 to 15 degrees.

The right end of the tapered portion 22 is extended to near the center YY line of the rim width, and the large diameter portion 23 is extended rightward from this portion. The large-diameter portion 23 has an inner diameter D2 close to the outer diameter D1 of the small-diameter portion 21 and a width W3 that is as short as possible (for example, 25 mm).
24 is formed on the inner peripheral portion of the left end of the step portion, which is bent radially outward.

The disk 25 integrally has a leg portion 26 that expands in a tapered shape toward the left at an angle of 5 to 7 degrees on the outer peripheral portion thereof, and a diameter is formed on the outer peripheral portion of the left end of the leg portion 26. A step portion 27 that bends inward in the direction is formed. Then, the disc 25 is inserted into the rim 16 from the right (outer) side, the step portion 27 of the leg portion 26 is fitted into the step portion 24 of the rim 16 from the right side, and the left ends of both fitting portions are joined together. The parts are welded 28 and fixed integrally.

According to the above embodiment, the right portion (outer side) of the well portion 20 of the rim 16 has a large diameter, and the disc 2
Since the outer peripheral portion of 5 is bent rightward (inner direction) and the left end of the large diameter portion 23 of the rim 16 and the left end of the outer peripheral portion of the disk 25 are integrally fixed, a large housing is provided on the inner side of the wheel 15. A space 29 is formed, and a braking device having a large capacity can be accommodated in this portion as in the conventional case. In this case, since the small-diameter portion 21 and the large-diameter portion 23 of the well portion 20 are connected by the taper portion 22 which is inclined at a small angle, stress concentration on the connecting portion does not occur due to the load received from the disk 25 side. The well portion 20 is not cracked due to repeated loading during traveling.

The rim 16 and the disk 25 are the same as the rim 1
Since the stepped portion 24 formed at the right end of the large diameter portion 23 of No. 6 and the stepped portion 27 formed at the left end of the outer peripheral portion of the disk 25 are fitted together, the positioning accuracy of both of them becomes high, A highly accurate wheel 15 can be obtained.

[0012]

As is apparent from the above description, according to the present invention, a wheel having a large accommodation space for accommodating a braking device on the inner side can be obtained with high accuracy, and a well portion is formed in the well portion due to a load during traveling. The effect of increasing the durability by preventing cracks from occurring.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a conventional example.

[Explanation of symbols]

 15 wheel 16 rim 17, 18 bead seat portion 20 well portion 21 small diameter portion 22 taper portion 23 large diameter portion 24 step portion 25 disc 26 leg portion 27 step portion 28 welding 29 accommodation space

Claims (2)

[Claims] 1. A cylindrical rim having a bead seat portion on the inner and outer sides, a well portion having a diameter smaller than that of the bead seat portion at an intermediate portion, and a leg that expands in a taper shape toward an inner portion on an outer peripheral portion. A two-piece wheel in which a disc portion having a portion is provided and the leg portion of the disc is fitted and integrally fixed to the well portion of the rim, the well portion is slightly wider than the width of one bead seat portion. Therefore, a small diameter portion having a substantially equal diameter, a taper portion expanding outward in the radial direction at a small angle from the small diameter portion toward the outer direction, and an end having a substantially equal diameter from the tapered portion toward the outer direction. A large-diameter portion of the width is continuously formed, and a step portion is formed at the outer-side inner peripheral end portion of the large-diameter portion to bend radially outward, and the inner-side outer periphery of the leg portion of the disc is formed. Bends radially inward at the end A two-piece wheel, wherein a step portion is formed, and the step portion of the disc is fitted to the step portion of the rim from the outer side and integrally fixed. 2. The well portion includes a small-diameter portion that is substantially wider than the width of one of the bead seat portions and has a substantially equal diameter, and a radially outer portion at an angle of 15 degrees or less from the small-diameter portion toward the outer side. A tapered portion that widens in one direction and a large-diameter portion having an end width that has a substantially equal diameter in the outer direction from the tapered portion are continuously formed, and the outer-side inner peripheral end portion of the large-diameter portion is formed. The two-piece wheel according to claim 1, wherein a step portion that bends radially outward is formed.