JP3207018U - Carbon fiber pulley structure - Google Patents

Abstract

A carbon fiber pulley structure having high strength and low wear and a long service life is provided. A carbon fiber pulley structure includes a pulley body. The pulley main body 20 has a circular shape, and a plurality of carbon fiber plates 200a, 200b, and 200c having different outer diameters are stacked and joined, and formed into a disk by a vacuum hot press method. On the outer periphery of the disk, a plurality of tooth grooves 22 are cut and formed at intervals, a plurality of pulley teeth 23 are formed between the plurality of tooth grooves 22, and a bearing hole 24 formed by cutting is formed in the center. A plurality of carbon fiber plates 200a, 200b, and 200c formed on the outside of the front surface and the back surface of the pulley body 20 have a large outer diameter and extend from the center portion of the pulley body 20, covering the end surface center portion of the pulley teeth 23, The plurality of inner layers are filled with carbon fiber plates 200a, 200b, and 200c having smaller outer diameters. [Selection] Figure 5

Description

  The present invention relates to a carbon fiber pulley structure, and more particularly, to a carbon fiber pulley structure having high strength and low wear and a long service life.

  As shown in FIG. 1 and FIG. 2, the conventional carbon fiber pulley structure has a structure in which a plurality of carbon fiber plates 100 having the same size are mainly stacked, and then the same thickness (the thickness of each part) is obtained by vacuum hot pressing. A plurality of pulley teeth 110 and a plurality of tooth grooves 111 for cutting the plate body 10 formed by a cutting method and passing the chain, and a circular hole 112 for attaching a bearing. And a pulley body 11 having two guide slopes 113 over which a chain formed by cutting the front and back surfaces of the pulley teeth 110 is spanned.

  However, since the conventional pulley body 11 has two guide slopes 113 formed by a cutting method on the front and back surfaces of the pulley teeth 110, the end portions of the multiple layers of carbon fiber plates 100 corresponding to the two guide slopes 113 are provided. Has a sharp crushing end 101 (see FIG. 2). The sharp crushing end 101 has low strength and is easily worn away, has low bonding strength, and is easily separated from the adjacent carbon fiber plate 100. The tooth end surface of the pulley tooth 110 is formed by the end surface of each carbon fiber plate 100. Therefore, the end surface of the pulley tooth 110 has a plurality of joint points. Therefore, it is easily worn out and easily detached, and the service life may be significantly shortened.

  Since the conventional pulley body 11 has a single thickness, when the bearing 12 is coupled and used as a guide pulley for the rear derailleur, the hole wall of the circular hole 112 does not have a sufficient supporting force for directly mounting the bearing 12. Since two bushes 14 are fitted on both sides of the circular hole 112 so that the distance between the pulley body 11 and the guide plates 13 on both sides is sufficient to accommodate the chain, The heights of the opposed outer end surfaces of the bush 14 are higher than the front and back surfaces of the pulley body 11, and after the bearing 12 is completely fitted into the two bushes 14, two dustproofs are provided on both sides of the inner hole of the bearing 12. After the cover 15 is inserted, the coupling bolt 16 is inserted into the two dust-proof covers 15 and screwed between the two guide plates 13, and the pulley body 11 has two guides. A rotatable axially between the rate 13. For this reason, the conventional technology has a complicated structure and a high manufacturing cost, and the strength and bonding strength of the entire configuration are not ideal.

  The conventional carbon fiber pulley structure is low in strength and easy to wear, has a short service life, and requires two bushes when mounting the bearing, so the mounting thickness is large and the manufacture and assembly are complicated. There was a problem.

  An object of the present invention is to provide a carbon fiber pulley structure having high strength and low wear and having a long service life.

  In order to solve the above-described problem, according to a first embodiment of the present invention, a carbon fiber pulley structure including a pulley body, wherein the pulley body has a circular shape and a plurality of carbon fibers having different outer diameters. Plates are stacked and joined, and formed into a disk by a vacuum hot press method, and a plurality of tooth grooves are formed on the outer periphery of the disk at intervals, and a plurality of pulley teeth are formed between the plurality of tooth grooves. The multi-layer carbon fiber plate formed on the outer side of the front surface and the back surface of the pulley body has a bearing hole that is formed and cut and formed in the center portion, and has a larger outer diameter from the center portion of the pulley body. The front and back surfaces of the pulley teeth that extend, cover the center of the end face of the pulley teeth, are filled with the carbon fiber plate having a smaller outer diameter, and are formed by vacuum hot pressing. The carbon fiber pulley structure in which two guide slopes characterized in that it is integrally molded is provided.

  A plurality of carbon fiber plates having a smaller outer diameter are provided inside the central portion of the pulley body, and the central portion of the pulley body formed by vacuum hot pressing is a thicker central portion. Are formed integrally, and a bearing hole is formed in the central portion to have a higher hole wall.

  It is preferable to further include the bearing fitted in the bearing hole by a pressing method.

  It is preferable to further include two dust-proof covers that cover both side surfaces of the bearing and in which the shaft holes are respectively bored.

  The carbon fiber pulley structure of the present invention has high strength and low wear and also has a long service life.

FIG. 1 is an explanatory view showing a state of forming a conventional carbon fiber pulley structure. FIG. 2 is an enlarged cross-sectional view showing pulley teeth of a conventional carbon fiber pulley structure. FIG. 3 is a cross-sectional view showing a state when a conventional carbon fiber pulley structure is applied to a rear derailleur. FIG. 4 is an explanatory view showing a state in which a carbon fiber pulley structure according to an embodiment of the present invention is molded. FIG. 5 is a partially enlarged cross-sectional view showing a carbon fiber pulley structure according to an embodiment of the present invention. FIG. 6 is an exploded perspective view showing a carbon fiber pulley structure according to an embodiment of the present invention. FIG. 7 is a perspective view showing a state in which a carbon fiber pulley structure according to an embodiment of the present invention is attached to a rear derailleur. FIG. 8 is an enlarged cross-sectional view showing a state in which the carbon fiber pulley structure according to the embodiment of the present invention is attached to the rear derailleur.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited thereby.

  Please refer to FIG. 4 and FIG. As shown in FIGS. 4 and 5, the carbon fiber pulley structure according to an embodiment of the present invention includes at least a pulley body 20. The pulley main body 20 has a circular shape, and a plurality of carbon fiber plates 200 having different outer diameters are stacked and bonded to each other, and formed into a disk 21 by a vacuum hot press method. 22 is formed by cutting at intervals. A plurality of pulley teeth 23 are formed between the plurality of tooth grooves 22 and have a bearing hole 24 formed by cutting at the center. A plurality of carbon fiber plates 200a formed on the outside of the front surface and the back surface of the pulley body 20 have a large outer diameter, extend from the center of the pulley body 20, cover the center of the end surface of the pulley teeth 23, and have a plurality of inner layers. Is filled with a carbon fiber plate 200b having a smaller outer diameter, and a plurality of carbon fiber plates 200c having a smaller outer diameter are provided inside the central portion of the pulley body 20 and molded by a vacuum hot press method. Two guide slopes 230 are integrally formed on the front surface and the back surface of the pulley teeth 23. A central portion 25 having a larger thickness is integrally formed at the central portion of the pulley body 20. The bearing hole 24 is formed in the central portion 25 and has a higher hole wall.

  The pulley body 20 of the present embodiment includes a plurality of carbon fiber plates 200. The plurality of outer carbon fiber plates 200a formed on the front surface and the rear surface of the pulley body 20 have a large outer diameter extending from the center portion of the pulley body 20 and covering the center portion of the end face of the pulley teeth 23. Since the layer is filled with a carbon fiber plate 200b having a smaller outer diameter, the two guide slopes 230 on the front surface and the back surface of the pulley teeth 23 formed by the vacuum hot press method are integrally formed and not cut. As described above, since the structural strength is high, it is prevented from being worn out or separated. In particular, the outer multi-layer carbon fiber plate 200a formed on the front surface and the back surface of the pulley body 20 is formed with the joining points 201 only on the tooth end surfaces of the pulley teeth 23. Can be prevented. Therefore, the present invention has the effect that the overall structural strength is high, the wear is small, and the service life is long.

  Reference is made to FIGS. As shown in FIGS. 6 to 8, the carbon fiber pulley structure according to the embodiment of the present invention includes a bearing 30 and two dust covers that are coupled between the two guide plates 52 of the rear derailleur 50 via the coupling bolts 51. 40 is further provided. The bearing 30 is fitted into the bearing hole 24 of the pulley body 20 by a pressing method. The two dustproof covers 40 are respectively provided on both side surfaces of the bearing 30. The two dustproof covers 40 have shaft holes 41 into which the coupling bolts 51 are inserted, and the pulley body 20 is rotatable between the two guide plates 52 in the axial direction.

  Since the bearing hole 24 of the pulley body 20 has a higher hole wall, the bearing 30 is directly pressed by a sufficient supporting force and is fitted therein. Therefore, when used as a guide pulley of the rear derailleur 50, there is no need to combine a bush or other members. Therefore, manufacturing and assembly are easy and the manufacturing cost can be reduced, and the overall structural strength can be increased.

  The preferred embodiments of the present invention have been disclosed as described above so that those skilled in the art can understand them, but these do not limit the present invention in any way. Various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the utility model registration claim of the present invention should be broadly interpreted including such changes and modifications.

DESCRIPTION OF SYMBOLS 10 Plate body 11 Pulley main body 12 Bearing 13 Guide plate 14 Bush 15 Dust-proof cover 16 Coupling bolt 20 Pulley main body 22 Tooth groove 23 Pulley tooth 24 Bearing hole 25 Center part 30 Bearing 40 Dust-proof cover 41 Shaft hole 50 Rear derailleur 51 Coupling bolt 52 Guide plate DESCRIPTION OF SYMBOLS 100 Carbon fiber plate 101 Breaking edge 110 Pulley tooth 111 Tooth groove 112 Circular hole 113 Guide slope 200 Carbon fiber plate 200a Carbon fiber plate 200b Carbon fiber plate 200c Carbon fiber plate 201 Joint point 230 Guide slope

Claims (4)

A carbon fiber pulley structure comprising a pulley body,
The pulley body has a circular shape, and a plurality of carbon fiber plates having different outer diameters are stacked and bonded to each other. The pulley body is formed into a disk by a vacuum hot press method, and a plurality of tooth grooves are spaced on the outer periphery of the disk. A plurality of pulley teeth are formed between the plurality of tooth grooves, and a bearing hole formed by cutting at the center is formed.
The plurality of carbon fiber plates formed on the outside of the front surface and the back surface of the pulley body have a large outer diameter, extend from the center of the pulley body, cover the center of the end surface of the pulley teeth, and have a plurality of inner layers. The carbon fiber plate is filled with the carbon fiber plate having a smaller outer diameter, and two guide slopes are integrally formed on the front and back surfaces of the pulley teeth formed by a vacuum hot press method. Fiber pulley structure. A plurality of carbon fiber plates having a smaller outer diameter are provided inside the central portion of the pulley body, and the central portion of the pulley body formed by vacuum hot pressing is a thicker central portion. Is integrally molded,
The carbon fiber pulley structure according to claim 1, wherein a bearing hole is formed in the center portion and a higher hole wall is formed.   The carbon fiber pulley structure according to claim 2, further comprising the bearing fitted in the bearing hole by a pressing method.   4. The carbon fiber pulley structure according to claim 3, further comprising two dust-proof covers that respectively cover both side surfaces of the bearing and have the shaft holes formed therein.

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