JPH0411295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a cast wheel for a light vehicle.

[Conventional technology]

Conventional wheels for light vehicles can be roughly divided into two types. One type is one in which the entire wheel is made of a cast metal, and the other is one in which the entire wheel is formed from a steel plate.

For wheels to be cast, the separately cast bearing boss and brake drum are placed in a fixed mold attached to a casting machine, and after the movable molds are aligned and clamped, aluminum die casting is poured through a sprue. It is boiled and taken out after cooling. The rim is then tightened and fixed to this integrated body with bolts.

Further, a wheel made of a steel plate is formed by forming each member by press working and integrating them by welding.

[Problem to be solved by the invention]

However, in the case of cast wheels, the bearing boss and the brake drum are molded separately, and they are placed in the mold separately and poured into the mold, but in that case, the pressure of the hot water during pouring Due to this influence and the fact that the cooling rate of the poured aluminum die casting differs in different parts of the mold, misalignment and deflection between the bearing boss and the brake drum often occur. Therefore, after taking out the wheel, it is necessary to machine and finish the inner and outer diameters of the bearing boss, the inner diameter of the drum, or the portion to which the rim is attached. Furthermore, it is necessary to assemble the rim to this integrated body. Therefore, there are problems in that many steps are required, the molding cost increases, and productivity is poor.

In addition, steel plate wheels have a fatal drawback in that the brake drums and other parts are thin, which causes the brake drums to vibrate when the brakes are applied, resulting in so-called brake squeal. .

The present invention was devised in view of these problems, and an object of the present invention is to provide a method for manufacturing a cast wheel for a light vehicle that has good productivity and does not generate brake squeal.

[Means to solve the problem]

As a means for this purpose, first, a hub formed by assembling a steel plate brake drum 2 and a bearing boss 1 and having torque clocks 7, 9, and 10 is fitted into a mold. Thereafter, metal was poured into the mold, and the spoke parts 4 and rim part 3 formed by the pouring were welded to the hub.

[Effect]

By assembling the steel plate brake drum 2 and the bearing boss 1, they are integrated and their mutual positional relationship is maintained in a stable posture. This integrated brake drum 2 and bearing boss 1 is placed in a mold and poured into a mold, but since the two are integrated and their relative positions and postures are stable, their postures will not collapse due to the hot water pressure. Also, it will not warp due to the influence of differences in the degree of cooling of the hot water.

Therefore, productivity can be improved without requiring a lot of post-processing as in the conventional method.

Further, since the brake drum 2 made of a steel plate is coated with die-casting and has a thick wall, it does not generate brake squeal unlike the conventional brake drum, and the thick wall also increases mechanical strength. Also, brake drum 2
By making the rim part 3 made of thin steel plate, which is thinner than conventional castings, and by integrally molding the rim part 3, eliminating the need for bolts or nuts to attach the rim part 3, the weight is reduced accordingly. can be achieved.

〔Example〕

An example of a wheel formed by the method of the present invention is shown in FIG. 1 and FIG. 1-a.

The brake drum 2 is formed by press forming a steel plate, and a bearing boss 1 formed by finishing the inner and outer diameters of a steel pipe material is fitted into the center thereof, and both are welded at a welding part 6. It forms a hub. The spoke parts 4 and the rim part 3 are made of aluminum die casting. This aluminum die casting is welded to the outer peripheral surface and side end surface of the brake drum 2 and to the peripheral end of the bearing boss 1. A plurality of torque locks 7, 9, and 10 are formed on the brake drum 2 and the bearing boss 1 to further strengthen the assembly with the aluminum die casting. A torque lock is a so-called anti-slip device, and in the case of the brake drum 2 of this embodiment, a plurality of holes are provided at appropriate locations, die-casting is poured into these holes, and the engagement between the two prevents the drum from slipping. . This torque lock is not limited to a hole, but any means for stopping slippage, such as a protrusion or unevenness, can be used.

Note that in this embodiment, a plurality of design windows 11
By forming the wheel, we aim to create a better design and reduce the weight of the wheel.

〔Effect of the invention〕

In this way, the present invention involves assembling the steel plate brake drum and bearing boss, placing them in a mold, and integrally molding the remaining parts by die casting. It is possible to provide wheels with high productivity without the need for processing.

In addition, there is no brake squeal, and it has excellent mechanical strength.
It exhibits many excellent effects such as being lightweight.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a wheel molded by the method of the present invention, and FIG. 1-a is a view taken along the line -' in FIG. Explanation of symbols, 1: Boss, 2: Brake drum,
3: Rim part, 4: Spoke part, 6: Welding part, 7,
9, 10: Torque clock, 11: Design window.

Claims (1)

[Claims] 1 A torque clock 7 formed by assembling a steel plate brake drum 2 and a bearing boss 1,
After fitting the hub having numbers 9 and 10 into the mold,
A method of manufacturing a cast wheel for a light vehicle, which comprises pouring metal into the mold and welding the spoke parts 4 and rim part 3 formed by the pouring to the hub.