JPS5936422Y2 - Casting wheel mold - Google Patents

Description

[Detailed explanation of the invention] With the social emphasis on improving safety, rubber and other elastic tires are being used for agricultural wheels, which are effective in reducing vibration. For wheels, thrust is obtained by scraping the soil with large, feather-like lugs, and as these are thin and large, quality cannot be stabilized, and they have not yet reached the point of practical use.

With this invention, it is possible to easily obtain a cast wheel with stable quality and dense lugs, which are the main part of this type of wheel.

The casting wheel referred to in this invention refers to a tire wrapped around a rim that is formed by injection molding, transfer molding, or other molding methods in which rubber or resin material is injected into the cavity of a mold through an injection hole. The method for wrapping the obtained wheel is not limited to the simple injection molding method.

Next, this invention will be explained based on the embodiments shown in the drawings.
1 and 2 are an upper mold and a lower mold, which are made to be divided into upper and lower parts at a plane that is the center of the rim 3.

However, in the drawings, the dividing surface is determined in this way because the cross section of the tire 4 is circular, but depending on the cross-sectional shape, the dividing surface does not necessarily have to be the center of the rim 3.

Reference numeral 5 denotes a tire cavity, which is formed by recesses 1 in the upper mold 1 and the lower mold 2 so that when the upper mold 1 and the lower mold 2 are combined, the tire is molded into a donut shape.

Needless to say, depending on the cross-sectional shape of the tire 4, it is not necessarily necessary to dig into both molds 1 and 2.

Reference numeral 6 denotes a lug cavity, which is inclined at a predetermined angle with respect to the radiation from the boss 7, so that when the wheel is used, a lug 8 protruding from the side of the tire 4 in the shape of a wing is formed. A plurality of narrow and deep casings are formed in the upper mold 1, and one end thereof is continuous with the tire cavity 5.

In the drawing, the lug cavity 6 is provided only in the upper mold 1, but it can be provided in the lower mold either continuously or discontinuously.

Reference numeral 9 denotes a protrusion cavity, which is provided at an appropriate interval on the outer periphery of the tire cavity 5.

Reference numeral 10 denotes an injection hole, which is provided at the back of each lug cavity and leads to the cylinder 11 that stores the material.
2, the material passes through the injection hole 10 and enters the cavities, filling the cavities.

Note that in the drawing, 13 is a spoke, whose both ends are fixed to the boss 7 and the rim 3, and serve as the main strength member of the wheel.

14 is a support pin; 15 is a guide pin; 16 is a guide hole; and 17 is a support portion that supports the spokes 13.

Since this invention is constructed as described above, the hole for passing the axle of the boss 7 is aligned with the support pin 14, and the spoke 13 is aligned with the support pin 14.
Then, the rim 3 is inserted into the lower mold 2, the guide pins 15 and the guide holes 16 are aligned, and the upper mold 1 and the lower mold 2 are pressed together.

Then, the rim 3 has each type 1,
It is held by a support part 17 that lifts up from the skin of the spoke 2 and supports the spoke 13 (a part of the spoke 13 is narrowed between the upper mold 1 and the lower mold 2, and the position is fixed, You can also use support pins.

) Fill each cavity 5, 6 and 9 with a material such as rubber,
When the material is vulcanized or hardened at a predetermined temperature for a required period of time, a wheel having the shape shown in FIG. 3 is completed.

That is, according to this invention, since the elastic material is injected under pressure from the deep position of each lug cavity 6, the pressure loss is minimized within the lug cavity 6, which is thin and wide and difficult for material to flow into. As a result, the material flows well into this, and each lug 8, which is the main part of this type of wheel, is made dense, resulting in a stable improvement in quality, a high end stop, and a wheel with stable performance. .

In the drawings, the connection between the upper die 1 and the cylinder 11 is schematically shown as being integral, but they may be separated and a conventional connection means may be used.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a side view of a casting wheel produced with a mold according to this invention when it is used; Fig. 2 is a cutaway front view of the mold;
FIG. 3 is a bottom view of the upper mold. In addition, the numbers in the drawings are: 1 is the upper mold, 2 is the lower mold, 3 is the rim, 5 - tire cavity, 6 is the lug cavity, 8 is the lug, 1
0 indicates an injection hole.

Claims (1)

[Scope of utility model registration request] It consists of two molds that are divided from the rim part, and when these two molds are put together, there is a support part that supports the rim away from the two molds, and a support part that supports the rim and lifts it from the skin and stores it in the center. A continuous donut-shaped cavity, and a plurality of lug cavities that protrude in the form of large wings to the sides of the tire and serve as lugs are provided in one or both types in succession to the tire cavity, and each lug cavity A mold for a casting wheel with an injection hole at the back of the part.