JPS5817250A - Chain noise reducing device - Google Patents

Abstract

PURPOSE:To easily restore a function of a cylindrical rubber by providing an urethane rubber cylinder mounted on a tooth root with an urethane square pillar having a polygonal section of a diagonal size larger than the inside diameter of the cylinder inserted therein in such a manner that the head portion of the pillar is projected. CONSTITUTION:A square pillar rubber 7 is formed of urethane rubber, which has a square section of a diagonal size S larger by 6-15% than the inside diameter d3 of a cylindrical rubber 6 formed of damaged urethane rubber and a height (h). This square pillar rubber is inserted inside of the cylindrical rubber 6 in such a manner as to project over a sprocket tooth root by delta0.

Description

DETAILED DESCRIPTION OF THE INVENTION 11) Related Technical Field The present invention relates to noise prevention of escalator step chains.

(2) Explanation of the prior art and its problems Escalators, moving walkways, etc. generate mechanical noise when operating. Moreover, since escalators and the like are often installed in buildings, reduction of this mechanical noise is always essential! I'm wanted. The main source of this mechanical noise is the drive motor.

These include steps, sliders, chain transmission mechanism parts, etc.

In particular, the 1 escalator uses a special step chain and sprocket with a relatively large capacity to drive the steps, but this step chain and sprocket generate an impact sound when they mesh, which is one of the causes of noise. It's worth it. Therefore, as one method to reduce the shock of the sprocket, a shock absorber has traditionally been used that reduces noise by planting rubber on the bottom of the sprocket tooth and bringing it into contact with the step chain roller during engagement. has been done. This conventional device will be explained below.

In FIG. 1, which is a detailed cross-sectional view showing the state immediately before the sprocket and chain roller come into contact, the sprocket has a diameter D (about 15 mm) smaller than the tooth width T (about 25 fi) of the sprocket 1,
A blind hole 2 with a depth of H is provided at the center of the tooth bottom of the sprocket.
In this hole, there is a diameter d that is as large as D, and a diameter d that is smaller than D.
, inside with steps that are larger than the diameter! ! +dm hole and height h
A cylindrical rubber 3 is implanted, and its tip is made to protrude by a distance from the bottom of the tooth. When K is set in this way, the roller 4 of the chain collides with the tip of this cylindrical rubber 3, causing it to become δ. Since the movement of the roller is damped, the sound when the roller hits the bottom of the tooth is reduced. At this time, the cylindrical rubber is compressed at the tip side d. It deforms so that it bulges outward.

The one shown in Figure 2 has an outside @d in the same hole as the one in Figure 1.
+1 Inner diameter d Inner diameter circle 10 This is a case where the cylindrical rubber is depressed. In this case, the tip of the cylindrical rubber has the outer diameter side (tliWIL) and the tip (1IIAK), and when it is pushed into the chain roller, it deforms so as to convex inward, and has the effect of buffering the roller. These two are typical shock absorbers, and have the effect of reducing noise by several db.

By the way, due to long-term use of this shock absorber, the tip of the cylindrical rubber became worn or cracked.)
It can be crushed or torn. Alternatively, damage may occur such as discoloration and melting due to heat when compressed by rollers. In such a case, the buffer rubber cannot perform its function and generates noise. In this case, the noise is a high-pitched, intermittent rattling sound, which has a strong impact on the surroundings.

If this happens, the cushioning rubber will naturally need to be replaced. However, this replacement work requires the use of a special tool to remove the rubber that has bitten into the sprocket hole, and it is time-consuming and requires a large number of rubber pieces. For this reason, it is difficult to complete the production within the time required for regular maintenance, and this poses a problem in maintenance work. (Objective and main points of the invention) The present invention solves these problems. The purpose is that when the cylindrical rubber is worn out and damaged, by leaving the cylindrical rubber at its current state and inserting another rubber, it is possible to recover its function to a greater degree than before.

(Structure of the invention) An embodiment of the present invention will be described below based on the drawings.

In Fig. 3.4, the prismatic rubber 7 made of urethane rubber has a square cross section with a diagonal dimension 8 that is 6 to 15 inches larger than the inner diameter d8 of the damaged cylindrical rubber 6 made of urethane rubber, and has a height h.
form.

This is inserted into the inside of the cylindrical rubber 6, and is made to protrude by a distance δ from the bottom of the sprocket tooth.

This @Fi structure has the following effects. The chain roller rolls 11J onto this prismatic rubber, causing the prismatic rubber to buckle. At this time, the movement of the chain roller is relaxed, and the impact noise when it hits the bottom of the sprocket tooth is reduced.

When the present invention was tested, it was found that the life of the prismatic rubber is several tens of times longer than that of conventional rubber. This is because the conventional rubber cylinder absorbs the collision energy of the chain roller by deforming only the tip of the cylinder, but in the case of the present invention, the prismatic rubber is supported by its ridgeline and has a space G around it. Because it is supported by cylindrical rubber, it is easy to deform the entire prism by 4 degrees, and this absorbs collision energy, reducing local stress, strain, and heat generation, resulting in improved durability. be. In this case, if you insert this prismatic rubber into a new cylindrical rubber of the same shape and use it - of course you can, but in this case it is better to insert it into the old cylindrical rubber, that is, the damaged cylindrical rubber mentioned above that has lost its tip. Experiments have also shown that shock absorption is better in the case of the case. Also, prismatic rubber is not limited to square, but can be triangular, quadrilateral, or other symmetrical shapes, and when combined with cylindrical rubber, the circumference is 1! K.G.
(Effects) According to this invention, the noise of an existing escalator can be reduced simply by installing prismatic rubber, and its durability is improved compared to conventional ones. As a result, the cost of maintenance and inspection of the escalator can be significantly reduced by 9 hours.

[Brief explanation of the drawing]

1 and 2 are sectional views of the conventional device, FIG. 3 is a sectional view of the device according to the present invention, and FIG. 4 is a plan view of FIG. 3.

Claims (1)

[Claims] A cylindrical shock absorber made of rubber is provided at the bottom of the tooth of a chain sprocket to alleviate the noise generated between the chain roller and the sprocket, and a cylinder made of urethane rubber is implanted in a hole in the bottom of the tooth, and the inner side of the cylinder is A chain noise mitigation device 0 characterized in that a urethane rubber prism having a polygonal cross section with a diagonal dimension larger than the inner diameter of the cylinder is inserted into the cylindrical inner diameter, and its head protrudes from the bottom of the sprocket tooth.