JPH09242830A - Silent chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the growth of partial wear of link plates by entirely engaging the outermost rows of the link plates with a sprocket without enlarging the outer widths of guide plates arranged on both sides of the links. SOLUTION: In a silent chain 1, notches 5 for guiding a sprocket 6 are formed on the faces of guide plates 3, on which the guide plates contact link plates 2, in inward positions from a line 4a linking up connecting pins 4, and the tooth crest parts of the sprocket 6 are provided so that they are entirely engaged with the outermost rows of the link plates 2 of the plural link plates 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent chain composed of a guide plate for preventing the sprocket from falling off, and more particularly to a silent chain in which a portion of the guide plate for guiding the sprocket is cut out.

[0002]

2. Description of the Related Art A conventional silent chain 1'is shown in FIG.
As shown in FIG. 8, the guide plate 3 ′ has a side surface shape (see FIG. 8).
It had a plane in (b)). Therefore, the inner spacing in the width direction between the guide plates 3'disposed on both sides of the plurality of link plates 2 is set to be equal to or slightly larger than the tooth thickness of the sprocket 6'as shown in FIG. are doing. A large number of link plates 2 that mesh with the sprockets 6'are arranged in the width direction so as to correspond to the intervals.

[0003]

However, since the tooth tips of the sprocket are tapered as shown in FIG. 9, the outermost row of the link plates 2 among the plurality of link plates 2 is formed. The tooth tips of the sprocket only partially engage with each other, which promotes uneven wear.

Therefore, an object of the present invention is to allow the outermost row of link plates to fully engage with the sprockets without enlarging the outer width of the guide plates arranged on both sides of the link, so that the link plates are biased. An object is to provide a silent chain that can avoid the promotion of wear.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and includes a plurality of link plates (2) meshing with a sprocket (6) in the longitudinal direction of a chain (1). Link (1a) is connected and arranged,
Guide plates (3) are provided on both sides of the link (1a) for preventing the links (1a) from falling off from the sprocket (6), and the link plates (2) and the guide plates (3) arranged in a stack are arranged in the width direction. In the silent chain (1) connected with the connecting pin (4) to the inner side of the line (4a) connecting the connecting pin (4) on the surface of the guide plate (3) in contact with the link plate (2) The silent chain (1) is characterized in that a notch (5) for guiding the sprocket (6) is formed at the position.

Further, the notch (5) is formed over the entire length of the guide plate (3) in the longitudinal direction.

Further, the notch (5) connects the connecting pin (4) of the guide plate (3) with a line (4a).
It is preferable that it is formed from the end surface on the inner side of to the vicinity of the position reaching the connecting pin (4).

[Operation] Based on the above configuration, the recesses of the links (1a) arranged in a large number and the notches (5) formed in the guide plates (3) arranged on both sides of the links (1a). When the sprocket (6) is inserted into the sprocket (6), the side surface of the sprocket (6) approaches or contacts the notch (5) formed in the guide plate (3), and the tooth tip of the sprocket (6) is By engaging the substantially entire surface of the link plate (2), it is possible to avoid the promotion of uneven wear of the link plate (2), so that the life of the silent chain (1) can be extended.

Further, the notch (5) is formed over the entire length of the guide plate (3) in the longitudinal direction, and a line (4a) connecting the connecting pins (4) of the guide plate (3). ) From the inner end surface of the connecting pin (4)
Since it is formed in the vicinity of the position where the lubricating oil flows in, the lubricating oil flows from the inflow path (7) of the lubricating oil into the position of the connecting pin (4) through the cutout portion (5). The lubricating oil can easily flow into the connecting pin (4) and the pin hole (8) of the link plate (2), and the maintenance work of the silent chain (1) can be rationalized.

Note that the reference numerals in parentheses described above are for reference to the drawings, and do not limit the configuration of the present invention.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a silent chain 1 showing an embodiment of the present invention. The silent chain 1 is formed by connecting and arranging links 1a composed of a plurality of link plates 2 meshing with the sprocket 6 in the longitudinal direction (FIG. 4), and the sprocket 6 is provided on both sides of the link 1a.
A guide plate 3 is provided to prevent it from falling off. And, the link plate 2 in which a large number of them are arranged in an overlapping manner
Also, by connecting the guide plate 3 with the connecting pin 4 in the width direction of the silent chain 1 and caulking both ends of the connecting pin 4 (FIG. 2), the silent chain 1 is prevented from being disassembled. It is provided in.

A notch portion 5 for guiding the sprocket 6 is provided at an inner position of a line 4a connecting the connecting pins 4 on a surface of the guide plate 3 on the side in contact with the link plate 2.
Is formed. Therefore, the cross section taken along the line AA of FIG.
As shown in, the side surface of the sprocket 6 approaches or contacts the notch 5 formed in the guide plate 3, and the tooth tips of the sprocket 6 mesh with substantially the entire surface of the link plate 2, The promotion of uneven wear of the link plate 2 can be avoided.

On the other hand, as shown in FIG. 3, the notch portion 5 is formed over the entire length of the guide plate 3 in the longitudinal direction, and a line 4a connecting the connecting pins 4 of the guide plate 3 is formed. It is formed from the end surface on the inner side to the vicinity of the position reaching the pin hole 8 into which the connecting pin 4 provided on the guide plate 3 is fitted. Therefore, as shown in FIG. 6 which is a cross-sectional view taken along the line BB of FIG. 1, since the lubricating oil flows into the pin hole 8 from the lubricating oil inflow path 7 through the cutout portion 5, the connection is made. Pin 4 and pin hole 8 of the link plate 2
Inflow of lubricating oil into the tank is facilitated.

Next, the operation of the present invention will be described.

Based on the above configuration, as shown in FIG.
The sprocket 6 is inserted into the recesses of the link plates 2 arranged in a stack and the notches 5 formed in the guide plates 3 arranged on both sides of the link plate 2, and the side surfaces of the sprocket 6 are the guide plates. The notch portion 5 formed in 3 is brought closer to or in contact with the notch portion 5, and the tooth top portion of the sprocket 6 meshes with substantially the entire surface of the link plate 2. Therefore, promotion of uneven wear of the link plate 2 can be avoided.

From the lubricating oil inflow path 7 formed by the notch 5 and the outermost row of link plates 2,
Lubricating oil flows into the pin holes 8 of the guide plate 3 and the outermost row of the link plates 2 via the notches 5. Further, the lubricating oil passes through the connecting pin 4 and easily flows into the fitting gap between the connecting pin 4 and the pin hole 8 of the link plate 2 located inside the outermost row of link plates 2. Therefore, the maintenance work of the silent chain 1 can be rationalized.

The notch 5 is formed over the entire length of the guide plate 3 in the longitudinal direction, but the present invention is not limited to this structure, and the guide plate 3 into which the sprocket 6 is inserted is omitted. The notch may be formed only in the central portion.

[0019]

As described above, according to the present invention, the side surface portion of the sprocket approaches or contacts the notches formed in the guide plates arranged on both sides of the link.
Since the tooth tips of the sprocket can be meshed with substantially the entire surface of the link plate of the link, it is possible to avoid promoting uneven wear of the link plate and extend the life of the silent chain, which is economical.

Further, since the tooth tips of the sprocket can be engaged with substantially the entire surface of the link plate without increasing the outer width of the guide plates arranged on both sides of the link plate, the limited transmission space is enlarged. Without promoting the uneven wear of the link plate without doing so, it is possible to avoid an increase in the size of the device and save the installation place of the device and reduce the cost.

Furthermore, since the notch is formed over the entire length of the guide plate in the longitudinal direction, it is easy to improve the accuracy of the shape of the notch and the notch can be easily machined. Therefore, it is possible to improve the quality and reduce the cost.

Further, since the remaining guide plate removed by the notch serves as a protection wall against noise generated by the engagement between the sprocket and the link plate, the quality of the silent chain is improved.

The notch formed over the entire length of the guide plate in the longitudinal direction is formed from the inner end surface of the line connecting the connecting pins of the guide plate to the vicinity of the position reaching the connecting pin. Since the lubricating oil flows into the position of the connecting pin from the inflow path of the lubricating oil through the cutout portion, the flowing of the lubricating oil into the connecting pin and the pin hole of the link plate is prevented. It can be done easily and the maintenance work of the silent chain can be rationalized.

[Brief description of drawings]

FIG. 1 is a front view of a silent chain showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 shows a guide plate which is an essential part of the present invention,
(A) Front view and (b) side view.

FIG. 4 is a front view of a link plate.

5 is a cross-sectional view taken along the line AA in FIG.

FIG. 6 is a sectional view taken along the line BB of FIG.

FIG. 7 is a front view of a conventional silent chain.

FIG. 8 is a front view (a) and a side view (b) showing a conventional guide plate.

9 is a sectional view taken along the line CC in FIG.

FIG. 10 is a sectional view taken along the line D-D.

[Explanation of symbols]

 1 Silent chain 1a Link 2 Link plate 3 Guide plate 4 Connecting pin 4a Line connecting connecting pins 5 Notch 6 Sprocket 7 Lubricating oil inflow path 8 Pin hole

Claims (3)

[Claims] 1. A link consisting of a number of link plates meshing with a sprocket is connected and arranged in the chain longitudinal direction, and guide plates for preventing the links from falling off from the sprocket are arranged on both sides of the link. In a silent chain in which a plate and the guide plate are connected by a connecting pin in the width direction, a notch for guiding the sprocket at an inner position of a line connecting the connecting pins on a surface of the guide plate that is in contact with the link plate. A silent chain characterized by forming a part. 2. The silent chain according to claim 1, wherein the cutout portion is formed over the entire length of the guide plate in the longitudinal direction. 3. The cutout portion is formed from an end face on an inner side of a line connecting the connecting pins of the guide plate to a position near a position reaching the connecting pin. Silent chain.