JPS5849720B2 - Rotating shaft connecting plate and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating shaft connecting plate for connecting a rotating shaft of an electric motor to an impeller for a cross-flow blower or other rotating body, and a method for manufacturing the same.

Conventionally, when an electric motor rotating shaft is integrally connected to a connecting shaft of a rotating body and rotated at high speed, if the center of the circular axis is even slightly off, the rotating body will vibrate, making stable and quiet operation impossible.

For this reason, various measures have been taken to absorb the vibrations of the rotating shaft on the connecting plate that connects the connecting shaft of the rotating body, but all of these devices increase the number of parts and require time and effort to assemble, making them unsuitable for mass production. Ta.

The most convenient material for vibration absorption is rubber, but since the connecting plate is made of a resin material such as ABS, it is difficult to connect the rubber material and the connecting plate integrally, and it is impossible to integrally mold both materials. It was said that

An object of the present invention is to provide a connecting plate which has an extremely simple structure and exhibits an excellent vibration absorption effect by embedding the outer peripheral edge of an annular rubber wall in a synthetic resin.

Furthermore, by pressurizing the molten resin while holding the periphery of the rubber wall between molds, the periphery of the rubber wall is buried in the resin in a compressed state, and the rubber wall expands according to the contraction when the resin solidifies, resulting in high precision. It is also an object of the invention to provide a method by which a certain shape of the connecting plate can be obtained.

Although FIG. 1 shows a situation in which the connecting plate 1 of the present invention is applied to an impeller 2 for a cross-flow blower of an air conditioner, it is of course possible to apply the connecting plate 1 to other rotating bodies.

The impeller 2 is made into a cylindrical body by inserting blades 4 at equal pitches on the circumference of a plurality of annular plates 3t3t3t3a,
A thin shaft 5 is protruded from one end and supported by a bearing 6, and a connecting plate 1 according to the present invention is provided at the other end to connect a rotating shaft 8 of an electric motor 70 to achieve high-speed rotation.

The connecting plate 1 is made by integrally baking and fixing the center hole edge 12 of a highly elastic annular rubber wall 11 to the outer periphery of a hollow connecting shaft 1o such as a metal tube, and forming an annular synthetic resin plate onto the outer periphery of the rubber wall 11 by injection molding of ABS resin. 13 is integrally molded, and an annular synthetic resin plate 13 is provided protruding from the outer periphery of the rubber wall.

The outer periphery of the rubber wall 11 is provided with a plurality of retaining portions 14 that protrude from both sides as shown in FIG. 4 or are recessed inward as shown in FIG. 6.

By embedding the retaining portion 14 in the hole edge of the annular synthetic resin plate 13, the rubber wall 11 and the synthetic resin plate 13 are prevented from peeling off and can withstand heavy loads.

A screw hole 16 is provided at the tip of the connecting shaft 10, and the connecting shaft 1
The rotating shaft 8 can be inserted into the 0 and firmly fixed with the screw 17.

The outer peripheral flange of the synthetic resin plate 13 is bonded to the center of the annular plate 3a on the end face of the impeller 2, and is integrated with the impeller 2 to transmit the rotation of the rotating shaft 30, while the rubber wall 11 absorbs vibrations of the rotating shaft.

Next, a method of manufacturing the above-mentioned connecting plate 1 will be explained.

First, an annular rubber wall 1 is placed around the outer periphery of a metal connecting shaft 10 such as a brass tube.
The rubber body 18, which has been integrated by baking the base end of the rubber body 18, is placed between a pair of injection molds 19 and 20 as shown in FIG. 19,
When 20 is closed, the rubber wall 11 is airtightly pressed and held between the molds.

The peripheral edge of the rubber wall 11 and the stopper part 14 are located in the cavity 21 of the mold, and on the inner surfaces of both molds 19 and 20 there are presser pins 22 that face inward from both sides and fit inside the stopper part 14. 23 is provided protrudingly, and this holding pin 2223 strongly presses the outer circumference of the rubber wall 11 to prevent the outer circumference of the rubber wall 11 from falling to the left or right inside the cavity 21 or from escaping from the cavity due to the injection pressure of the resin. .

When the rubber body 18 is fixed between the molds, the molten thermoplastic resin such as ABS resin is placed in the cavity 21 under high pressure (300
~400kg/cI! ) is injected.

The resin fills the cavity to form the annular joint resin plate 13 of the connecting plate 1, and pressurizes the outer periphery of the rubber wall 11 in the cavity with a high pressure according to Boyle's law.

The pressure acting from both sides of the rubber wall 11 and the retaining part 14 is balanced and maintains the rubber wall 11 at the center of the cavity, but due to the radial force directed inward from the outer peripheral surface, the rubber wall 11
is subjected to an extrusion action from the cavity 21.

However, since molds 19 and 20 strongly press the rubber wall 11 to support it in the radial direction, the outer periphery of the rubber wall 11 maintains its correct position even though it is exposed to abnormally high pressure. be.

When the resin is in a molten state, the rubber wall 1 due to its high pressure
1 is compressed, but when the resin begins to cool and solidify, volumetric contraction occurs due to the inherent properties of the resin.

However, when the internal pressure of the cavity decreases due to volumetric contraction of the resin, the rubber wall 11 elastically expands by the amount of contraction of the resin, causing the resin to flow and creating a cavity between the resin molded body and the mold surface of the mold. This makes it possible to mold the synthetic resin plate 13 with a shape and size that precisely matches the structure of the cavity.

As described above, the connecting plate 1 of the present invention includes a connecting shaft 1o, a rubber wall 11
Since it is composed of only three parts of the synthetic resin plate 13, and these parts are integrated, it has the advantage of being sturdy, having an extremely low risk of trouble, and being able to be supplied at low cost.

In addition, the connecting plate 1 is manufactured all at once by insert molding the rubber body 18, which eliminates the need to individually manufacture and assemble a large number of parts as in the conventional method, making it easy to manufacture and ideal for mass production. .

Furthermore, since the rubber wall 11 is elastically compressed when the resin is injected under pressure, when the resin shrinks in volume due to cooling and solidification, the rubber wall 11 expands by that amount, causing the resin to flow and solidifying with the cavity filled with resin. It has many excellent advantages, such as being able to manufacture mounting plates with highly accurate dimensions and shapes.

[Brief explanation of drawings]

FIG. 1 is a front view of an impeller showing a situation in which the present invention is implemented;
Fig. 2 is a front view of the connecting plate of the present invention, Fig. 3 is a partially cutaway oblique view of the same, Fig. 4 is an oblique view of the rubber body, and Fig. 5 is a vertical sectional view of the mold device during molding. , FIG. 6 is a longitudinal sectional view of a mold device in another embodiment. 1... Connecting plate, 3... Rotating shaft, 1o.
Curved/connecting shaft, 11...Rubber wall, 13...
-Synthetic resin plate, 14...Bending retaining part, 18...Rubber body, 19.20...Bending mold.

Claims (1)

[Scope of Claims] 1. A retaining portion that integrally connects the central hole edge 12 of the annular rubber wall 11 surrounding the rotating shaft to the connecting shaft 10 to which the rotating shaft is to be connected, and that is uneven laterally on the outer peripheral edge of the rubber wall 11. form 14,
The annular synthetic resin plate 1 is inserted by inserting the retaining part 14.
A rotary shaft connecting plate in which a rubber wall 11 and a synthetic resin plate 13 are integrally connected by being embedded in the hole edge of No. 3. 2. A retaining part 14 is integrally connected to the central hole edge of the annular rubber wall 11 on the connecting shaft 10 and is uneven laterally on the periphery of the rubber wall 110.
The rubber body 18 with the rubber body 18 is fitted between the joint resin molds 19 and 20, and the rubber wall 11 is strongly pressed by the molds 19 and 20. Type 19
．． 20, a molten thermoplastic resin is pressure injected into the cavity 21, and the rubber wall 11 is elastically compressed to form an annular synthetic resin plate 13, and the rubber wall 11 is compressed as the resin hardens. A method for producing a rotating shaft connecting plate characterized by expanding through elastic deformation to compensate for volumetric contraction and forming with high precision.