JPS6354926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a functional shaft body made of a synthetic resin that has a strong structure and is easily manufactured. Consisting of member A and synthetic resin parts located inside and outside the cylinder and integrally provided with the cylinder, the synthetic resin parts located inside and outside the cylinder The synthetic resin part that is continuous through the hole and located outside is related to the functional shaft that constitutes the functional member B in the vicinity of the through hole.

Synthetic resins, which are lightweight and have excellent moldability, are widely used as constituent materials for power transmission shaft bodies in which cams and gears are provided on the shaft, various fans in which the fan rotor is provided in the shaft, and the like. In other words, the shaft rod may be made of synthetic resin, a functional member made of synthetic resin may be attached separately to a metal shaft rod, or the shaft rod and functional member may be integrally and continuously insert-molded with synthetic resin. I do things like that. If the functional parts are attached separately, the attachment parts may come loose after long-term use. Especially if the functional parts are power transmission parts such as cams or gears, they will loosen quickly because force is constantly applied to them. It took a lot of effort to attach it firmly so that it would not come loose.
On the other hand, when the shaft rod and the functional member are integrally made of synthetic resin by insert molding, it may be slightly distorted due to the difference in shrinkage between the resin and the solid rod, the shape of the detent and positioning, etc. In some cases, the reinforcing solid rod may deviate from the center position due to injection pressure during molding, etc., and when such a rod is used, it is difficult for it to run out during rotation. Looking at it this way, none of the three conventional products mentioned above are satisfactory in terms of use.
Improvements were awaited.

This invention solves the drawbacks of the conventional products mentioned above.
This is intended to provide a functional shaft body made of synthetic resin.

Functional members A and B referred to in this invention refer to the functional members A and B, when the cylinder body is not just a rod but a shaft body that performs a function such as a power transmission shaft, and the functional shaft body has a desired function. It means a member provided to accomplish the following.

This invention will be explained in detail below with reference to the drawings,
This invention is not limited to the following examples.

FIGS. 1 and 2 show examples of the functional shaft body 1,
It consists of a cylindrical body 2, a functional member A3, and a synthetic resin part 4. The synthetic resin part 4 consists of a synthetic resin part 4a located inside the cylinder and a synthetic resin part 4b located outside, and the synthetic resin part 4b located outside constitutes the functional member B5. The functional member A3 is configured in the shape of a pulley, and the functional member B5 is configured in the shape of a roller.The functional member A3 is made of metal or a hard synthetic resin, and the functional member B5 is made of a synthetic resin that is slightly soft and has elasticity. The roller-shaped functional member B5 is made of synthetic resin with a slightly soft elasticity in order to increase adhesion since it feeds plates, etc. On the other hand, the pulley-shaped functional member A3, which is rotated by a belt, is not distorted. It must be made of metal or hard synthetic resin.

Hereinafter, the manufacturing process of the functional shaft body 1 will be explained with reference to FIG. 3, and the advantages of this manufacturing process will be described.

There are fixed molds and movable molds for injection molding.
The cylinder body 2 and the functional member A are integrated with the cylinder body 2 in the fixed mold X.
3, and then a movable mold X' (not shown) is mounted from the front so as to match the mold X. Y
is a cavity for forming the functional member B5, 6 is a through hole of the cylindrical body 2, and Z is an injection port for the molten synthetic resin.

Therefore, when the molten synthetic resin is injected from the injection port Z, the synthetic resin parts 4a and 4b located inside and outside the cylinder 2 are continuously provided through the through hole 6,
The internal synthetic resin portion 4a is fixedly joined to the functional member A3 at one end. According to such a manufacturing method, the cylindrical body 2, the functional member A3, and the synthetic resin part 4 are integrally obtained during injection molding, so that manufacturing workability is extremely good.

When injecting molten synthetic resin, high pressure is applied to the cylinder from the inside, but since most of it is in contact with the inner surface of the mold, it does not deform.This means that the cylinder must have a very strong structure to withstand the resin pressure. Since there are no cracks, relatively inexpensive thin-walled pipes can be used.

Furthermore, although the synthetic resin part has a large thermal shrinkage, the internal synthetic resin part is continuously fixed to the external synthetic resin part through the through hole, so the longitudinal direction of the cylinder is the biggest concern. Shrinkage in this direction is suppressed, and since the external synthetic resin part is small, the shrinkage is small, so a product with excellent dimensional accuracy can be obtained as a whole, and the molding technique is also very easy.

For the cylinder 2, other than aluminum materials, metal materials such as copper materials and mild steel materials, and thermosetting or heat-resistant resin pipes can also be used; however, they have excellent rigidity and excellent heat resistance during molding. It is desirable to use metal materials. The materials for the functional member A3 and the synthetic resin portion 4 are selected depending on the desired function of the functional shaft 1. Metals and various heat-resistant resins are used as the material for the functional member A3, and synthetic As the material for the resin portion 4, general-purpose resins such as polypropylene resin and polyethylene resin, and all thermoplastic resins such as polyacetal resin and noryl resin are used. FIG. 4 shows another embodiment, in which the functional member A3 is a gear having teeth all around it, and the functional member B5 is a gear having teeth only in two directions. By positioning it in a disc-shaped cavity with no notches on the inner teeth, it can be pulled out of the mold in any direction.
Note that the gear of the functional member B5 is provided with teeth only in two opposing directions, which are the die cutting directions (indicated by arrows), to prevent undercuts during die cutting. The structure of this embodiment is used when it is desired to obtain various functional parts from the same synthetic resin material, and when some of the various functional parts become undercuts and cannot be easily cut out. All you have to do is implement it. 7 and 7' are sliding parts, respectively;
One is provided integrally with the functional member A3 and the other with the synthetic resin portion 4.

The functional member A3 and the functional member B5 may be made of the same material or different materials, or may have different physical properties. The physical properties are hardness, wear resistance, etc. As mentioned above, in the case shown in Fig. 1, a material with high hardness is used as the functional member A3, and a material with low hardness and elasticity is used as the functional member B5. The material may be selected so that the functional member A3 and the functional member B5 can perform their functions more fully. Moreover, there may be a plurality of functional members A3 and functional members B5, or there may be a plurality of types of functional members A3 and B5.

5 and 6 show other embodiments of how the functional member A3 is attached to the cylindrical body 2. In the example shown in FIG. The functional member A3 is configured to be firmly fixed to the cylindrical body 2 with the synthetic resin portion 4 biting into the groove portion 9. The mounting insertion portion 8' of the functional member A3 shown in FIG. Functional member A
Since the force in the rotational direction of 3 is received by the cylinder 2, the shaft 1 is the power transmission shaft and the functional member A3
It is effective if it performs a rotation function. Note that the functional member A3 may be fixed to the cylindrical body 2 using screws or the like if a high-strength fixation is desired, but it is also possible to use the adhesiveness of the molten resin when molding the synthetic resin part 4. Just do it.

FIG. 7 shows another embodiment of the structure near the through hole 6 of the cylinder 2, and shows a synthetic resin part 4b located outside the cylinder 2.
The edge 11 of the through hole 6 rises and sinks into the inside, and in this configuration, the functional member B5, which is the external synthetic resin portion 4b, is more firmly attached to the cylinder 2 than in the configuration shown in the cross-sectional view of FIG. is fixed and provided. The one shown in Fig. 8 shows the through hole 6 (generally 1 to 5 mmφ) provided in the cylinder body 2 of the one shown in Fig. 2, and the one shown in Fig. 9 shows the through hole 6 of the one shown in Fig. 7. show,
The former is circular, while the latter is formed approximately cross-shaped. In other words, in the latter, high output (usually injection When the molten synthetic resin pressure during molding is 250 to 600 kg/cm ² flows out through the through hole 6, the edge 11 of the through hole 6 is raised by the pressure. 10th
11 and 12 show other embodiments of the through hole 6 in which the edge 11 is configured to stand up; however, the notch 12 is elongated in the axial direction of the cylinder 2. This is not preferable because it reduces the strength of the body 2. The through hole 6 shown in FIG. 12 is opened when resin is injected. Although the raised shape of the edge portion 11 is formed during molding as described above, it may be formed at the same time when the through hole 6 is punched out.

In the embodiments described above, the functional shaft 1 is used as a shaft for power transmission, and the functional members A3 and B5 of the above embodiments may be suitably gears, pulleys, rollers, cams, etc. Other possible embodiments include a cross-flow fan for heating and cooling functions and a shaft for a noodle press-cutting machine.

This invention is a functional shaft constructed as described above, which can be easily manufactured, and because the cylindrical body is used as a framework, there is no risk of distortion and no vibration occurs during rotation. It is. In addition, since the functional member B is continuous with the synthetic resin part inside the cylinder, it is firmly installed.Furthermore, there is also a functional member A that is provided separately from the functional member B, so it can perform a variety of functions. It is something.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a side view of the manufacturing state of the invention with explanation omitted, Fig. 4 is a side view of another embodiment, Figs. 6
The figure is a perspective view of an installation example of the functional member A, FIG. 7 is a vertical sectional view of another example near the through hole of the cylinder, FIG. 8 is a plan view showing the through hole of the structure shown in FIG. 2, and FIG. 9 is a plan view showing the through hole of the one shown in FIG. 7, FIG.
FIGS. 11 and 12 are plan views of other embodiments of the through hole. DESCRIPTION OF SYMBOLS 1...Functional shaft body, 2...Cylinder body, 3...Functional member A, 4...Synthetic resin part, 5...Functional member B, 6...
...through hole.

Claims (1)

[Scope of Claims] 1. A cylindrical body formed in advance into a cylindrical shape with a through hole bored in its outer peripheral wall, and a preformed functional member A.
Then, the functional member A and the cylindrical body are placed in an injection mold, and the molten synthetic resin is injected with the functional member A placed near one end of the cylindrical body. It consists of a synthetic resin part that is molded integrally with the cylindrical body, and this synthetic resin part is molded inside the cylindrical body, and a shaft core part that is molded integrally with the functional member A through one end of the cylindrical body. and a functional member B, which is formed to continuously protrude from the shaft core portion through the through hole to the outside of the cylindrical body, and constitutes a member different from the functional member A. 2. The functional shaft according to claim 1, wherein the functional member A is made of a material different from the synthetic resin that constitutes the functional member B. 3. The functional shaft according to claim 1, wherein the functional member A is made of the same material as the synthetic resin constituting the functional member B. 4. The functional shaft according to claim 1, wherein the functional member A is made of a material that has different physical properties from the synthetic resin that constitutes the functional member B. 5. The functional shaft according to claim 1, wherein the cylindrical body is made of metal. 6. The functional shaft according to claim 1, which is a power transmission shaft.