EP2207986A1

EP2207986A1 - Sound-damping unit for a sprocket, and sprocket

Info

Publication number: EP2207986A1
Application number: EP08845933A
Authority: EP
Inventors: Burkhard Grobbel
Original assignee: Ketten Wulf Betriebs GmbH
Current assignee: Ketten Wulf Betriebs GmbH
Priority date: 2007-11-03
Filing date: 2008-10-15
Publication date: 2010-07-21
Also published as: DE202007015303U1; BRPI0818921A2; CA2704010C; BRPI0818921B1; RU2010122582A; JP2011502233A; CN101842613A; CA2704010A1; WO2009056219A1; CN101842613B; RU2446332C2; US8764593B2; US20100273589A1

Abstract

The invention relates to a sound-damping unit (1) for a sprocket (10), comprising a mounting foot (2) for connection to a sprocket (10), an elastic body (3) placed on the mounting foot (2) that is suitable for cushioning a chain (14) running onto a sprocket (10), wherein the elastic body (3) is provided with a protective cap (4) or protective layer. The invention further relates to a sprocket (10) comprising a circular sprocket disc having a number of teeth (12) and tooth gaps (11) in the circumferential direction, wherein the sprocket (10) is equipped with at least one sound-damping unit (1) that is configured to reduce the noise upon a chain (14) running onto said sprocket (10), said sound-damping unit being at least one sound damping unit (1) according to one of Claims 1 to 7.

Description

NOISE MEASURING EQUIPMENT FOR A CHAIN WHEEL AND CHAIN WHEEL

The present invention relates to a Geräuschdämmeinrichtung for a sprocket according to the preamble of claim 1, and a sprocket according to claim 8.

A sprocket noise isolator is known which has a substantially rigid mounting foot and a substantially resilient body. The mounting foot is preferably a cross-section of an L-shaped element

Steel material, which is equipped on the one hand with corresponding holes for attachment to a sprocket and on the other hand serves as a receptacle for the elastic body. The elastic body is preferably a rectangular parallelepiped. For noise reduction are a number of such

Geräuschdämmeinrichtungen mounted on a sprocket, such that a running on the sprocket chain can be supported by the elastic body. For the noise of a chain drive is essentially responsible for the impact of the chain on the teeth or tooth gaps of the sprocket. Due to the noise damping devices, the chain initially strikes the elastic body, so that the chain is taken up in a manner braked in the teeth or tooth gaps.

A disadvantage in this context, however, the wear of the elastic body, by the continuous impact of the chain on the elastic body of the Geräuschdämmeinrichtungen, as well as by the taking place in a small linear movement of the link plates bed ingt by wandering the chain joints within the tooth gaps when circulating the sprockets, arises. This is where the present invention is based and makes it its mission to propose a sound insulation device for a sprocket, which has a reduced wear.

According to the invention this object is achieved by a noise damping device with the characterizing features of claim 1. Characterized in that the elastic body is equipped with a protective cap or protective coating to reduce wear, the wear of the Geräuschdämmeinrichtung, in particular the elastic body can be significantly reduced. This measure is not self-evident, since the person skilled in the art is first prevented from giving up the noise-reducing properties of the elastic body by providing a protective cap, which as a rule consists of a harder material than the elastic body, because of the hard material again a noise is to be expected. Surprisingly, the noise development with the protective cap according to the invention nevertheless remains limited and the advantages of low wear outweigh the benefits.

In an advantageous embodiment of the proposed Geräuschdämmeinrichtung can be provided that the material of the protective cap or protective coating has a greater hardness than the material of the elastic body. Surprisingly, it was found that the noise does not increase significantly despite the harder material for the protective cap, for example steel.

In an advantageous embodiment of the proposed invention can be provided that it is the material of the protective cap or protective coating to a plastic, polypropylene, polyethylene, polyurethane, or a steel material or hard rubber.

As an advantageous material for the elastic body, for example, an elastomer such as natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butadiene rubber (BR) or Ethylene-propylene-diene rubber (EPDM), or a polyurethane elastomer having a homogeneous or cellular structure or combinations of these plastics with one another, for. B. with different degrees of hardness in question.

In a material and weight-saving variant of the proposed noise damping device can be provided that the mounting foot has a cross-sectionally L-shaped or cuboid shape.

For advantageous attachment of the proposed Geräuschdämmeinrichtung can be provided that the mounting foot is equipped with holes, in particular with through holes, for receiving screws.

In an advantageous embodiment of the proposed sound insulation device can be provided that the elastic body is also fitted and / or with additionally introduced inner contour (eg., Oval bore) is executed. As a result, of course, the suspension damping characteristic changes or this can be influenced more or less targeted. The sidecut also offers the advantage that the elastic body in the loaded state not-or not so fast-rests against the flat surface of the sprocket. Accordingly, unnecessary wear can be avoided. A further object of the proposed invention is to propose a sprocket comprising a circular sprocket wheel with a number of teeth and tooth gaps in the circumferential direction, the sprocket being equipped with at least one noise isolating device adapted to reduce the noise when running a chain on the Sprocket to reduce, with a long service life is to be achieved with regard to the Geräuschdämmeinrichtungen.

According to the invention this object is achieved by a sprocket with the characterizing features of claim 8. Because it is at least one noise damping device according to one of claims 1 to 7, a longer service life of the entire sprocket can be realized because of the wear-reducing protective cap. The advantages are significant, if it is taken into account that such sprockets are used, for example, in escalators and a change of noise insulation has the temporary closure of the entire escalator result.

In an advantageous embodiment of the proposed sprocket can be provided that the sprocket is equipped on both sides with Geräuschdämmeinrichtungen. In this way, the service life of the sprocket according to the invention can be further extended because the sound absorbing absorption of the chain can be done by a larger number of Geräuschdämmeinrichtungen, as would be possible with only one-sided attachment of Geräuschdämmeinrichtungen. Also, the noise can be further reduced.

In a further advantageous embodiment of the proposed sprocket according to the invention can be provided that the Noise insulating means are disposed within circular segment segments and below the teeth, wherein the circular segment segments are defined by geometric connecting lines between the center and the tooth spaces. In this area between the tooth gaps advantageously the link plates can be picked up by the noise damping devices and there is a sequential "unrolling" of the link plates on the noise insulation devices, as indicated by the dashed link plates or the chain pin in FIG a particularly quiet impact of the chain on the sprocket.

In a further advantageous embodiment of the proposed invention can be provided that optionally one, two or three or more Geräuschdämmeinrichtungen are mounted in each circular segment segment. Depending on the application, a corresponding number of Geräuschdämmeinrichtungen may be appropriate here.

In a further advantageous embodiment of the proposed invention can be provided that the

Noise insulation means are respectively mounted below the tooth spaces, so that the chain pin of the chain can be received in accordance with the respective Geräuschdämmeinrichtung. For appropriate applications, such an arrangement of the Geräuschdämmeinrichtungen bring benefits, for example, because the link plates are too narrow to be absorbed on the Geräuschdämmeinrichtungen. This measure can be provided in addition to or as an alternative to the attachment of the sound insulation devices below the teeth. In a further advantageous embodiment of the sprocket according to the invention can be provided that a number of holes, preferably through holes, are provided for receiving the Geräuschdämmeinrichtungen in the sprocket.

In a further advantageous embodiment of the proposed sprocket according to the invention can be provided that a larger number of holes is provided as needed, so that any possible mounting position of the Geräuschdämmeinrichtung can be realized. The fact that a larger number of holes is provided, which does not necessarily have to be used for mounting all Geräuschdämmeinrichtungen, the fitter can still decide on-site, which arrangement and number he chooses for the Geräuschdämmeinrichtungen.

In experiments, it has been found that a mounting position of the Geräuschdämmeinrichtungen that allows compression of the elastic body between the applied and non-applied chain by about 1 to 5 mm, a particularly advantageous noise reducing effect.

Further features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Show in it

Figure 1 is a Geräuschdämmeinrichtung invention in a front view.

FIG. 2 shows a sound-damping device according to the invention in a sectional view; FIG.

3 shows a first alternative embodiment of a noise damping device according to the invention in a front view (alternative embodiment of the elastic body);

4 shows a first alternative embodiment of a sound insulation device according to the invention in a sectional view (alternative embodiment of the elastic body);

5 shows a second alternative embodiment of a noise damping device according to the invention in a front view (alternative embodiment of the mounting foot);

6 shows a second alternative embodiment of a sound insulation device according to the invention in a sectional view (alternative embodiment of the mounting foot);

Fig. 7 shows a third alternative embodiment of a Geräuschdämmeinrichtung invention in one Front view (alternative embodiment of the elastic body);

8 shows a third alternative embodiment of a sound insulation device according to the invention in a sectional view (alternative embodiment of the elastic body);

9 shows a sprocket according to the invention in a lateral view;

Fig. 10 shows an inventive sprocket in a sectional view.

First, reference is made to FIG. 1.

A noise damping device 1 according to the invention essentially comprises a mounting foot 2, an elastic body 3 and a protective cap 4.

The mounting foot 2 has a substantially L-shaped cross-section, wherein one of the legs for receiving the elastic body 3 and the other leg for mounting on the sprocket 10 is provided. For this purpose, holes 5 may be provided in the leg of the mounting foot 2, can be passed through the appropriate screws. The L-shaped mounting foot is preferably made with simple (i.e., cylindrical) bores 5. Existing screw heads and nuts may be covered by the elastic bodies.

The mounting foot 2 may also have other shapes, such as the shape of a rectangular parallelepiped (see Figures 5 and 6), correspondingly the elastic body would be on one of the side surfaces attached to the cuboid and provided corresponding holes in the cuboid, can be inserted through the screws. The bores of the cuboid mounting foot can preferably be stepped bores or countersunk bores, which are set up to receive the screw heads or nuts.

The elastic body 3 is preferably an elastomer such as natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butadiene rubber (BR ) or ethylene-propylene-diene rubber (EPDM) or a polyurethane elastomer having a homogeneous or cellular structure or combinations of these plastics with each other, eg with different degrees of hardness. The elastic body is preferably glued or vulcanized to the mounting base 2.

The elastic body 3 may also be waisted and / or with additionally introduced inner contour (for example oval bore). As a result, of course, also changes the suspension damping characteristics or this can be influenced more or less targeted. The sidecut also offers the advantage that the elastic body in the loaded state not-or not so fast-rests against the flat surface of the sprocket. Accordingly, unnecessary wear can be avoided.

On the side facing in an assembled state of the male chain side of the elastic body 3 is provided according to the invention with a protective cap 4 or coating, which is more resistant and wear-resistant than the elastic body. A preferred material for a protective cap 4 is For example, polypropylene, polyurethane, a steel material or a hard rubber.

A likewise inventive sprocket 10 with a Geräuschdämmeinrichtung invention 1 is shown in Fig. 9 and 10. As can be seen here, a number of noise isolation devices 1 are arranged on the side surfaces of the sprocket 10. It may optionally be provided that sound insulation devices 1 are provided only on one side of the sprocket 10 (not shown) or on both sides of the sprocket 10. In principle, it is provided that the noise damping devices 1 are arranged on the sides of a geometric polygon around the center 15 of the sprocket 10. Furthermore, variations with respect to the position of the sound insulation devices 1 with respect to the teeth 12 or tooth spaces 1 1 are conceivable. If, for example, from the center 15 of the sprocket 10 in each case a straight connecting line 13 is pulled to the tooth gaps 1 1, this divides the sprocket 10 into a number of segments. While in the figures an arrangement of two Geräuschdämmeinrichtungen 1 is provided in such a segment and below the teeth 12, the position of a single Geräuschdämmeinrichtung 1 between the tooth gaps 1 1 is shown by the dashed lines indicated Geräuschdämmeinrichtung 1. Of course, it is also conceivable to arrange all three or even more sound insulation devices 1 in such a segment. It is also conceivable to arrange the Geräuschdämmeinrichtungen 1 immediately below the tooth gaps (not shown).

For mounting the Geräuschdämmeinrichtungen 1 a number of holes 16, preferably through-holes at the corresponding positions of the sprocket 10 is provided. It can be advantageously provided that a maximum number of Holes 16 is provided, which need not necessarily be used for the attachment of Geräuschdämmeinrichtungen 1. The installer on site can still decide in this case, which arrangement he chooses for the Geräuschdämmeinrichtungen 1.

The sizing and positioning of the

Noise insulation devices 1 on the sprocket 10 takes place in practice so that they only a few millimeters, preferably 1 -5 mm, spring. This deflection is essentially to be adjusted depending on the dimensions of the conveyor chain.

The damping elements proposed here can, measured at their height, realize very considerable compression travel, in other words, it results in a favorable spring travel / total height.

Claims

claims:

A noise insulating device (1) for a sprocket (10) comprising

a mounting foot (2) for connection to a sprocket (10),

an elastic body (3) attached to the mounting foot (2) and suitable for cushioning a chain (14) running onto a sprocket (10),

characterized in that

the elastic body (3) is provided with a protective cap (4) or protective coating.

2. noise insulation device (1) according to claim 1, characterized in that the material of the protective cap (4) or protective coating has a greater hardness than the material of the elastic body (3).

3. noise insulation device (1) according to any one of the preceding claims, characterized in that it is the material of the protective cap (4) or protective coating is a plastic, in particular polypropylene, polyurethane, or a steel material or hard rubber.

4. noise insulation device (1) according to any one of the preceding claims, characterized in that it is in the material of the elastic body (3) to an elastomer such as natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene Rubber (SBR), chloroprene rubber (CR), butadiene rubber (BR) or ethylene-propylene-diene rubber (EPDM) or a polyurethane Elastomer having a homogeneous or cellular structure or combinations of these plastics with each other, for example, with different degrees of hardness.

5. noise damping device (1) according to one of the preceding claims, characterized in that the mounting foot (2) has a cross-sectionally L-shaped or cuboidal shape.

6. Geräuschdämmeinrichtung (1) according to any one of the preceding claims, characterized in that the mounting foot (2) with holes (5), in particular with through holes and / or stepped holes or countersunk holes, is equipped for receiving screws.

7. noise insulation device (1) according to any one of the preceding claims, characterized in that the elastic body (3) is configured cuboidal or waisted and / or with an inner contour, in particular an oval bore, is equipped.

8. A sprocket (10) comprising a circular sprocket wheel having a number of teeth (12) and tooth spaces (1 1) in the circumferential direction, wherein the sprocket (10) is equipped with at least one Geräuschdämmeinrichtung (1), which is adapted to To reduce noise when running a chain (14) on the sprocket (10), characterized in that it is at least one Geräuschdämmeinrichtung (1) according to one of claims 1 to 7.

9. sprocket (10) according to claim 8, characterized in that the sprocket (10) is equipped on both sides with Geräuschdämmeinrichtungen.

10. sprocket (10) according to any one of the preceding claims, characterized in that the Geräuschdämmeinrichtungen are disposed within circular segment segments and below the teeth (12), said circular segment segments by geometric connecting lines (13) between the center and the tooth spaces (1 1) are defined.

1 1. Sprocket (10) according to any one of the preceding claims, characterized in that optionally one, two, three or more Geräuschdämmeinrichtungen (1) are mounted in each Kreisabschnittssegment.

12. sprocket (10) according to any one of the preceding claims, characterized in that the Geräuschdämmeinrichtungen are each mounted below the tooth spaces (1 1).

13. sprocket (10) according to any one of the preceding claims, characterized in that a number of holes (16) are provided for receiving the Geräuschdämmeinrichtungen in the sprocket (10).

14. sprocket (10) according to any one of the preceding claims, characterized in that a larger number than required by bores (16), for receiving the

Noise insulation is provided in the sprocket (10), so that any possible attachment position of the Geräuschdammeinrichtung can be realized.

15. sprocket (10) according to any one of the preceding claims, characterized in that the mounting position of the Geräuschdämmeinrichtungen (1) is selected such that the deflection of the elastic body (3) between applied and not aufgelegtter chain (14) about 1 -5 mm is.