JP4394215B2 - Silent chain - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silent chain.
[0002]
[Prior art]
Conventionally, as a silent chain, there is a chain having a structure shown in FIGS.
[0003]
The silent chain 200 shown in FIG. 5 and FIG. 6 includes an inner link 202 having meshing link plates 201 and 201 and an outer link 205 having a guide link plate 203 and a meshing link plate 204 alternately by connecting pins 206. It is connected and configured.
[0004]
In this silent chain 200, the guide link plate 203 and the meshing link plate 204 of the outer link 205 are integrated with the connecting pin 206, and the meshing link plate 201 of the inner link 202 is loosely fitted to the connecting pin 206. It is bent by the loose fitting part.
[0005]
The silent chain 300 shown in FIGS. 7 and 8 includes an inner link 302 having a mesh link plate 301 and an outer link 305 having a guide link plate 303 and a mesh link plate 304. , 304 are press-fitted and fixed to the bushings 306, 307 through the connecting pins 308 and alternately connected.
[0006]
Each of the meshing link plates 301 and 304 of the inner link 302 and the outer link 305 is used as a pair, and each of the bushes 306 and 307 includes the pair of link plates 301, 301, 304 and 304 are press-fitted and fixed in common.
[0007]
In this silent chain 300, the guide link plate 303 and the bush 307 of the outer link 305 are integrated with the connecting pin 308, the bush 306 of the meshing link plate 301 of the inner link 302 is loosely fitted to the connecting pin 308, It is bent by this loose fitting portion.
[0008]
[Problems to be solved by the invention]
However, the silent chain 200 shown in FIG. 5 does not bend between the outer link 205 and the connecting pin 206, but only at the loose fitting portion between the meshing link plate 201 of the inner link 202 and the connecting pin 206. Therefore, only the meshing link plate 201 of the inner link 202 has a thickness at a portion that rotates with respect to the connecting pin 206.
[0009]
Therefore, in the silent chain 200 shown in FIG. 5, the rotational sliding portion in the bent portion is concentrated locally, and wear occurs between the meshing link plate 201 of the inner link 202 and the connecting pin 206 when used for a long time. In some cases, the inner link 202 rattles against the connecting pin 206, the chain pitch is distorted, noise is generated, and the feature of low noise is lost.
[0010]
On the other hand, the silent chain 300 shown in FIG. 7 does not bend between the bushing 307 of the meshing link plate 304 of the outer link 305 and the coupling pin 308, and the bushing 306 of the meshing link plate 301 of the inner link 302 and the coupling pin. Since it bends only at the loose fitting portion with 308, the portion rotating with respect to the connecting pin 308 is only the length of the bushing 306.
[0011]
However, the length of the bushing 306 is almost the same as the thickness of the two meshing link plates 301. As a result, the silent chain 300 shown in FIG. 5 is almost the same as the silent chain 200 shown in FIG. 5, and like the silent chain 200 shown in FIG. 5, the rotational sliding portion in the bent portion is concentrated locally, and when used for a long time, the bush 306 and the connecting pin are As a result, wear occurs between the connecting pin 308 and the inner link 302 rattling against the connecting pin 308, which may cause noise and lose the feature of low noise.
[0012]
Furthermore, since the pulling force applied to the silent chains 200 and 300 is applied to the local portions of the connecting pins 206 and 208, the connecting pins are deformed and the silent chain is not smoothly bent, which causes noise generation. .
[0013]
The present invention provides a silent chain capable of maintaining a low noise even when used for a long period of time by increasing the area of a rotating sliding portion in a bent portion, reducing wear and preventing deformation of a connecting pin. The purpose is to do.
[0014]
[Means for Solving the Problems]
The silent chain (10) of the present invention includes an inner link (11) having a meshing link plate (15), and an outer link (12) having a guide link plate (17) and a meshing link plate (18). The connecting pins (13) are alternately connected and provided between the meshing link plate (15) of the inner link (11) and the connecting pin (13). A bush (14) press - fitted and fixed to the meshing link plate (15) and loosely fitted to the connecting pin (13) is provided, and the bush (14) is a meshing link plate of the inner link (11) ( 15) has an extension part (14a) extending through the meshing link plate (18) of the outer link (12) adjacent to the outer link (12), and the extension part (14a) has an inner peripheral surface (14b) as described above. Connecting pin Loosely fit into (13), it is characterized in that the outer peripheral surface (14c) is loosely fitted into the meshing link plates (18) of the outer link (12).
[0015]
A plurality of the inner links (11) and the outer links (12) of the silent chain of the present invention are provided, and the meshing link plates (18), (18) of the outer links (12) are the connecting pins. They are adjacent to each other in the axial direction (13) .
[0016]
The inner link (11) of the silent chain (10) of the present invention has a plurality of adjacent mesh link plates (15), (15).
[0017]
The hardness of the bush (14) of the silent chain (10) of the present invention is higher than the hardness of the meshing link plate (18) of the outer link (12).
[0018]
[Action]
In the silent chain (10) of the present invention, the bush (14) is press-fitted and fixed to the meshing link plate (15) of the inner link (11) and is loosely fitted to the connecting pin (13), and the extension portion is the outer link. Since the mesh link plate (18) and the connecting pin (13) of (12) are loosely fitted, the mesh link plates (15), (15) of both the inner link (11) and the outer link (12) 18) is bent with respect to the connecting pin (13) via the bush (14).
[0019]
The length of the bush (14) is substantially the same as the sum of the thickness of the mesh link plate (15) of the inner link (11) and the thickness of the mesh link plate (18) of the outer link (12). The portion in contact with the connecting pin is a thickness corresponding to the sum of the meshing link plates (15) and (18) of both the inner link (11) and the outer link (12).
[0020]
Therefore, in the silent chain (10) of the present invention, the portion in contact with the connecting pin in the bent portion of the conventional silent chain is only the thickness of the meshing link plate (15) of the inner link (11). On the other hand, it becomes longer by the thickness of the meshing link plate (18) of the outer link (12), and the area of the rotational sliding portion with respect to the connecting pin (13) is increased accordingly.
[0021]
In the silent chain (10) of the present invention, when the meshing link plate (15) of the inner link (11) is composed of a plurality of adjacent ones, the bushing (14) is press-fitted and fixed to the meshing link plate (15). The length of the portion is increased, and the bush (14) is press-fitted and fixed to the meshing link plate (15) in a stable state.
[0022]
In the silent chain (10) of the present invention, when the hardness of the bush (14) is higher than the hardness of the meshing link plate (18) of the outer link (12), the wear resistance is improved, and the bush (14 ) Wear is reduced.
[0023]
In addition, the code | symbol in the parenthesis mentioned above is shown in order to refer drawings, Comprising: The structure of this invention is not limited at all.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a silent chain according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
[0025]
The silent chain 10 shown in FIGS. 1 to 3 is configured to be bent by alternately connecting inner links 11 and outer links 12 with connecting pins 13.
[0026]
The inner link 11 has two overlapping mesh link plates 15 and 15 having bushes 14 press-fitted and fixed at both ends. The outer link 12 includes a guide link plate 17 and a meshing link plate 18 having fitting holes 16 through which the bushings 14 are formed at both ends.
[0027]
The connecting pin 13 passes through the bush 14 and is loosely fitted, and guide link plates 17 are press-fitted and fixed at both ends.
[0028]
The mesh link plates 15 and 18 mesh with a sprocket (not shown). The guide link plate 17 regulates the width so that the inner link 11 and the outer link 12 are not disassembled, and is located on both sides of the thickness of the sprocket so that the silent chain 10 is not detached from the sprocket. .
[0029]
The bushing 14 extends toward the meshing link plate 18 of the adjacent outer link 12. The extended portion 14 a supports the connecting pin 13 so that the inner peripheral surface 14 b of the bush 14 is substantially axially continuous with the connecting pin 13 and rotatably supports the outer peripheral surface 14 c and the fitting hole 16 of the mesh link plate 18. Is supported rotatably.
[0030]
The bush 14 is made of a material having higher hardness than the mesh link plate 18 of the outer link 12.
[0031]
In the above configuration, the silent chain 10 of the present invention has the bushing 14 press-fitted and fixed to the meshing link plate 15 of the inner link 11 and loosely fitted to the connecting pin 13, and the extension portion 14 a is meshed with the outer link 12. Since the link plate 18 and the connecting pin 13 are loosely fitted, the mesh link plates 15 and 18 of the inner link 11 and the outer link 12 are bent with respect to the connecting pin 13 via the bush 14.
[0032]
The length of the bush 14 is substantially the same as the sum of the thickness of the mesh link plate 15 of the inner link 11 and the thickness of the mesh link plate 18 of the outer link 12, and the bush 14 contacts the connecting pin 13. The length of the portion is substantially the same as the thickness of the meshing link plates 15 and 18 of both the inner link 11 and the outer link 12.
[0033]
For this reason, in the silent chain 10 described above, the portions of the conventional silent chains 200 and 300 that are in contact with the connecting pins 206 and 308 are only the thickness of the mesh link plates 201 and 301 of the inner links 202 and 302. In contrast, the length of the outer link 12 is increased by the thickness of the meshing link plate 18, and the area of the rotational sliding portion of the bent portion with respect to the connecting pin 13 is increased accordingly.
[0034]
More specifically, when the thicknesses of the meshing link plates 15 and 18 are the same, the area of the conventional rotary sliding portion is two of the meshing link plates. The area is equivalent to three of the meshing link plates, and the area of the rotational sliding portion is increased by about 50%, and the wear of the bent portion is reduced accordingly. In addition, since a high hardness material is used for the bush, wear is further reduced.
[0035]
Therefore, since the silent chain 10 has a large area of the rotating and sliding portion, unlike the conventional case, there is no local wear on the connecting pin, and even when used for a long period of time, there is little wear. The inner link 11 does not rattle against the pin 13, and further prevents the connecting pin 13 from bending, resulting in lower noise than before and maintaining low noise even when used for a long time. Can do.
[0036]
Two meshing link plates 15 of the inner link 11 are adjacent to each other. In FIG. 1, the meshing link plate 18 of the outer link 12 is loosely fitted to the inner end of the bush 14 and meshed. This is because the pulling force of the link plate 18 is applied to the bush 14 in a cantilever state, so that the press-fitting length of the bush 14 with respect to the mesh link plate 18 is increased to ensure press-fitting and fixing.
[0037]
In addition, since a high hardness material is used for the bush 14, the bush 14 is difficult to deform.
[0038]
A single plate having a thickness corresponding to two pieces may be used as the meshing link plate 15 of the inner link 11. Further, three or more meshing link plates 15 may be used.
[0039]
The silent chain 10 in FIG. 1 has two sets of inner links 11 and outer links 12 arranged in the width direction of the chain. However, three sets like the silent chain 100 shown in FIG. Four or more sets may be arranged. In the silent chain 100 shown in FIG. 4, the same parts as those of the silent chain 10 shown in FIG.
[0040]
In this case, in the inner link 111 in the middle in the width direction, the bushing 114 extends to both sides of the meshing link plate 115, and the meshing link plate 119 of the outer link 112 is loosened through the fitting hole 116 in the extension 114a. It is fitted.
[0041]
As with the silent chain 10 of FIG. 1, the silent chain 100 also has a small amount of wear because the area of the rotational sliding portion in the bent portion is widened so as not to cause local wear. 13 is prevented, the noise is lower than before, and the low noise can be maintained even when used for a long time.
[0042]
Carbon steel and alloy steel are used for pins, bushes and link plates. The Vickers hardness of the pin is about HV800 or higher, or about HV1300 or higher. The Vickers hardness of the bush is about HV600 to HV800. The Vickers hardness of the link plate is about HV400 to about HV600.
[0043]
【The invention's effect】
In the silent chain of the present invention, the thickness of the mesh link plate of the outer link is the only portion of the conventional silent chain that is in contact with the connecting pin, which is the thickness of the mesh link plate of the inner link. Since the area of the rotating sliding part with respect to the connecting pin is widened accordingly, the wear of the bent part is reduced, and the inner link does not rattle against the connecting pin. The pin is prevented from being deformed, and low noise can be maintained even when used for a long time.
[0044]
In the silent chain of the present invention, when the mesh link plates of the outer links are arranged adjacent to each other, the outer links are supported in a well-balanced manner by the bushes fixed to the mesh link plates. Wear and deformation of the connecting pin can be further reliably reduced.
[0045]
In the silent chain of the present invention, when the mesh link plate of the inner link is composed of a plurality of adjacent ones, the length of the portion where the bush is press-fitted and fixed to the mesh link plate becomes long, and the bush becomes the mesh link plate. It can be press-fitted and fixed in a stable state, and can be reliably connected to the meshing link plate of the outer link for a long time in a cantilever state.
[0046]
In the silent chain of the present invention, if the hardness of the bush is higher than the hardness of the mesh link plate of the outer link, wear resistance is improved, wear of the bush is reduced, and low noise can be maintained for a long time. it can. Further, the bushing itself can be prevented from being deformed.
[Brief description of the drawings]
FIG. 1 is a front view and a partial sectional view of a silent chain according to an embodiment of the present invention.
FIG. 2 is a view of the silent chain of FIG. 1 as seen from the front side.
3 is a cross-sectional view taken along arrow 3-3 in FIG.
FIG. 4 is a front view and a partial cross-sectional view of a silent chain according to another embodiment of the present invention.
FIG. 5 is a front view of a conventional silent chain and a partial cross-sectional view.
6 is a cross-sectional view taken along arrow 6-6 in FIG.
FIG. 7 is a front view and a partial cross-sectional view of another conventional silent chain.
8 is a sectional view taken along arrow 8-8 in FIG. 7;
[Explanation of symbols]
10, 100 Silent chain 11, 111 Inner link 12, 112 Outer link 13 Connecting pin 14, 114 Bushing 14a, 114a Extension 14b Inner peripheral surface 14c Outer peripheral surface 15, 115 Inner link meshing link plate 16 Outer link meshing Link plate fitting hole 17 Guide plate 18 Outer link meshing link plate

Claims (4)

In a silent chain formed by alternately connecting an inner link having a meshing link plate and an outer link having a guide link plate and a meshing link plate by a coupling pin,
A bush provided between the meshing link plate of the inner link and the connecting pin, press - fitted and fixed to the meshing link plate of the inner link , and loosely fitted to the connecting pin;
The bush has an extension extending through the mesh link plate of the outer link adjacent to the mesh link plate of the inner link;
The extension part has an inner circumferential surface loosely fitted to the connecting pin, and an outer circumferential surface loosely fitted to the meshing link plate of the outer link . The silent chain according to claim 1, wherein a plurality of the inner links and the outer links are provided, and meshing link plates of the outer links are adjacent to each other in the axial direction of the connecting pin . The silent chain according to claim 1 or 2 , wherein the inner link includes a plurality of adjacent meshing link plates.   The silent chain according to claim 1, wherein the hardness of the bush is higher than the hardness of the meshing link plate of the outer link.

Images