JPH04106551U - resin pulley - Google Patents

Abstract

(57) [Summary] [Purpose] In a resin pulley, the entire outer belt hanging part is evenly deformed due to shrinkage after molding, and its roundness is maintained, resulting in vibration during use and shortened lifespan. Eliminate fear. [Structure] The resin pulley of the present invention has an outer belt hanging part 1 and an inner boss part 2 arranged concentrically apart from each other, an annular disk part 3 that connects these together, and The reinforcing ribs 4 are provided with radially arranged reinforcing ribs 4 connected along the belt, and the entire reinforcing ribs 4 or at least the connecting portion 4a with the outer belt hanging portion 1 are inclined along the circumferential direction. It is something to do.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a common resin pulley for belt drive. Regarding reinforcing rib structure.

0002

[Conventional technology]

Conventionally, this type of resin pulley has been made with reinforced fibers such as glass fiber. Some products are made by injection molding thermoplastic resins such as polyamide resins. As an example, a device having a schematic configuration as shown in FIGS. 5 and 6 is known. ing.

0003 In other words, this plastic pulley has concentrically spaced outer belt hooks. part 1 and inner boss part 2, an annular disk part 3 that connects these together, and a diameter It is equipped with linear reinforcing ribs 4 arranged radially and connected along the direction. . The annular disk portion 3 extends in the longitudinal direction of the outer belt hanging portion 1 and the inner boss portion 2. Each of the reinforcing ribs 4 is located between the central positions along the outer belt hanging part. 1 and the inner boss portion 2 in the longitudinal direction.

0004 In addition, these reinforcing ribs 4 reduce the weight while maintaining the strength of the resin pulley. It was established to achieve this goal. Furthermore, the resin made in this way A rolling bearing or a metal bush is attached to the inner boss portion 2 of the pulley. On the other hand, the driving belt is stretched over the outer belt hanging portion 1. However, illustration of these is omitted.

[0005]

[Problem that the idea aims to solve]

By the way, in the conventionally configured resin pulley, the resin that is the material for its formation is Shrinkage occurs after molding, but the shrinkage stress generated at this time is weak in strength. In other words, the reinforcing ribs 4 in the outer belt hanging portion 1 directly The action will be concentrated on the unsupported portion 1a. Therefore, this These unsupported portions 1a deform inward in the radial direction, and this As a result of not being able to maintain the roundness of the outer belt hook part 1 of the This resulted in vibration of the resin pulley used in the process and a shortened service life. In addition, this At this time, the supporting portion 1b of the outer belt hanging portion 1 excluding the non-supporting portion 1a is , is connected to the thick inner boss portion 2 via reinforcing ribs 4, and by this reinforcing rib 4, Because it is strongly supported, deformation is less likely to occur.

[0006] Therefore, in order to effectively prevent the occurrence of such inconvenience, for example, we have developed a pulley made of resin. It is possible to adjust the thickness of each part of the wall or increase the number of reinforcing ribs 4. However, the reality was that sufficient effects were not obtained. Also, cooling after molding Increase the time or use a jig to remove the deformed non-supporting part 1a of the outer belt hanging part 1. Although the adoption of measures such as corrective measures are being considered, it is difficult to If this happens, the production time will be extended and the number of steps will increase accordingly. , a different inconvenience arises in that manufacturing efficiency is reduced.

[0007] The present invention was devised in view of these inconveniences, and it The supporting part supported by the reinforcing ribs also becomes non-functional due to the shrinkage of the resin that occurs after molding. To maintain the roundness of the outer belt hanging part by deforming it to the same extent as the supporting part. The purpose of the present invention is to provide a resin pulley with a configuration that allows the following.

[0008]

[Means to solve the problem]

In order to achieve this purpose, the resin pulley according to the present invention is arranged in a concentrically spaced manner. The outer belt hook part and the inner boss part arranged in between are connected together. An annular disc part and radially arranged reinforcing ribs connecting these parts along the radial direction. The entire reinforcing rib or at least the connection with the outer belt hanging part It is characterized in that the knotted portion is inclined along the circumferential direction.

[0009]

[Effect] According to the above configuration, the entire reinforcing rib or at least the outer belt hanging portion Since the connection part is inclined along the circumferential direction, it resists the force acting along the radial direction. This will reduce the resistance of the reinforcing ribs that should support the outer belt hook. . Therefore, the resin from which the resin pulley is formed shrinks after molding, and this causes When the resulting shrinkage stress acts on the outer belt hook, it is supported by the reinforcing ribs. Supported by reinforcing ribs as well as the unsupported parts of the outer belt hook Even the supporting portions that have been deformed are deformed inward in the radial direction.

0010

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings.

[0011] FIG. 1 is a front view showing the schematic structure of only the upper half of the resin pulley according to this embodiment. Each of FIGS. 2 to 4 is a front view showing a modification of the reinforcing rib structure. Note that these figures are the same as or similar to FIGS. 5 and 6 showing the conventional example. Corresponding parts and parts are given the same reference numerals and detailed explanations are omitted here. Ru.

0012 This resin pulley consists of an outer belt hook part 1 and an inner belt hook part 1 arranged concentrically apart from each other. A side boss portion 2, an annular disk portion 3 with a predetermined thickness that connects these together, and a diameter It is provided with a plurality of reinforcing ribs 4 arranged radially and connected along the direction. So Therefore, the overall shape of each of these reinforcing ribs 4 is aligned in the same direction along the circumferential direction. The connection between each reinforcing rib 4 and the outer belt hanging portion 1 is The tie portion 4a is connected to the outer belt hanging portion 1 in a tilted state along the circumferential direction. Ru.

[0013] In addition, only the connecting portions 4a of these reinforcing ribs 4 are located along the circumferential direction. They may be curved and inclined, and those placed adjacent to each other may be Of course, they may be shaped to face each other along the circumferential direction. So At this time, the connecting portions 4a of each reinforcing rib 4 are both inclined. Since it is connected to the outer belt hook part 1, the material used to form this resin pulley is Another advantage is that the reinforcing fibers blended into a certain resin can be oriented smoothly. In addition, The annular disk part 3 is at the center position along the longitudinal direction of the outer belt hook part 1 and the inner boss part 2. The reinforcing ribs 4 are arranged between the outer belt hanging part 1 and the inner boss. It is the same as the conventional example that it is arranged between the end positions in the longitudinal direction of part 2. .

[0014] That is, in this resin pulley, each of the reinforcing ribs 4 is curved. , the outer belt hanging portion 1 is supported against the force acting along the radial direction. It is clear that the resistance force that each reinforcing rib 4 should have is reduced. There The resin used to form this resin pulley shrinks after molding, and this causes shrinkage. When the shrinkage stress generated by The unsupported portion 1a of the outer belt hanging portion 1 deforms inward in the radial direction. Of course, the outer belt hanging portion 1 supported by the reinforcing ribs 4 Even the supporting portion 1b extends inward in the radial direction like the non-supporting portion 1a. It will transform. Note that this also applies to the outer belt hanging portion of the reinforcing rib 4. The same applies even if only the connecting portion 4a with 1 is inclined along the circumferential direction. Ru.

[0015] By the way, regarding the reinforcing rib structure of the resin pulley, the structure shown in Fig. 1 is used. For example, as shown in Figure 2, the circumference of the resin pulley is not limited to Reinforcement ribs 4 that are curved facing each other along the direction are adjacent to each other They may also cross each other. In addition, as shown in FIG. 3, the reinforcing ribs 4 It is also possible to keep each straight line without curving it and tilt it along the circumferential direction. As shown in FIG. At the same time, only the connecting part 4a is separated into two parts and attached to the outer belt hanging part 1. May be connected.

[0016]

[Effect of the idea] As explained above, according to the resin pulley according to the present invention, the entire reinforcing rib is Or at least the connecting part with the outer belt hanging part is inclined along the circumferential direction. As a result, the resistance force of the reinforcing ribs that should resist the force acting along the radial direction decreases. become. Therefore, the resin used to form the resin pulley shrinks after molding. When the resulting shrinkage stress acts on the outer belt hook, the reinforcing ribs cause Similar to the unsupported part of the outer belt hook, the reinforcing ribs Even the supported portion is deformed inward in the radial direction. Therefore, this outer belt hook will deform to the same extent as a whole. , the roundness of this outer belt hanging portion is maintained. As a result, when using This makes it possible to eliminate vibrations and shortened lifespan of resin pulleys. difference In addition, due to this, the wall thickness of each part of the resin pulley must be adjusted, and the There is no need to increase the cooling time, and there is no need to reduce production efficiency. Become.

[Brief explanation of drawings]

FIG. 1 is a front view showing a schematic configuration of only the upper half of a resin pulley according to the present embodiment.

FIG. 2 is a front view showing a modification of the reinforcing rib structure.

FIG. 3 is a front view showing a modification of the reinforcing rib structure.

FIG. 4 is a front view showing a modification of the reinforcing rib structure.

FIG. 5 is a front view showing a schematic configuration of only the upper half of a resin pulley according to a conventional example.

FIG. 6 is a sectional view taken along line AA in FIG. 5;

[Explanation of symbols]

1 Outer belt hook part 2 Inner boss part 3 Annular disc part 4 Reinforcement rib 4a Connection site

Claims (1)

[Scope of utility model registration request] Claim 1: An outer belt hook part and an inner boss part arranged concentrically apart from each other, an annular disk part connecting these together, and a radially arranged belt part connecting these together in the radial direction. What is claimed is: 1. A resin pulley comprising a reinforcing rib, the entire reinforcing rib or at least a portion connected to an outer belt hanging portion being inclined along the circumferential direction.