JPS62101940A - Silent chain - Google Patents

Abstract

PURPOSE:To improve the tensile strength of a chain by arranging an auxiliary plate over a guide plate inside it, and fitting the end of a short coupling pin in the hole of the auxiliary plate. CONSTITUTION:Ring plates 2 are coupled by coupling pins 7, 8 in holes 4, and guide plates 5 are arranged on both the outsides of the ring plates on their every other row. An auxiliary plate 2a is arranged over the guide plate 5 between that and the ring plate 2 on the most outer side of the row of the ring plates, and a long pin 7 is fitted in the hole 6 of the guide plate 5. Consequently, shearing force caused by tensile force affecting on the chain is supported by the coupling pins 7, 8 composed of a long and a short pin, thus, the tensile strength of a chain can be improved.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a silent chain, and more particularly, it has a pair of long and short connecting pins each having an arcuate cross-sectional shape, and a silent chain that guides both ends of the long connecting pin. This invention relates to a silent chain that is fixed by being fitted into a hole in a plate, and has a connecting pin that has increased shear strength.

(b) Conventional technology The so-called rocker joint type silent chain is
As shown in Fig. 5 CBI, a plurality of link plates a, each having a pair of teeth that mesh with the tin rocket teeth and a pair of holes C formed at the positions corresponding to the teeth, are placed horizontally as shown in Fig. 4. Figure 5 [C]
A pair of long and short connecting pins d and e having arcuate cross sections as shown in K are inserted into holes C to connect these link plates, and a pair of connecting pins d and e having an arcuate cross section as shown in FIG.
A guide plate f having no driving teeth as shown in FIG.

By the way, in the structure of a rocker joint type silent chain, it is essential that one of the pair of connecting pins is fixed to the guide plate while the other connecting pin is allowed to swing freely with respect to the guide plate. Conventionally, only one long connecting pin was fixed to the guide plate as described above.

On the other hand, when tension is applied to the silent chain, the link plays (a) are alternately pulled in opposite directions, so a shearing force acts on the connecting pins, producing a shearing core force. The maximum value of this shear core force occurs at the point where the effective cross-sectional area of the connecting pin is smallest, so in a conventional silent chain, the attachment of the long connecting pin to the guide plate is greatest at the root.

For this reason, when a large load is applied to a conventional silent chain, the long connecting pin breaks at the root of the chain, making the chain unusable.(c) Problems to be Solved by the Invention The problem to be solved by the present invention is to increase the tensile strength of a silent chain in an inexpensive manner by using a guide plate and a link plate in an overlapping manner.

B.) Means for Solving the Problems In order to solve the above problems, the present invention provides a plurality of link plates each having a pair of drive teeth and a pair of holes that are inserted into the holes. A silent chain connected side by side in the horizontal and vertical directions by a pair of long and short connecting pins, and fitted and fixed into holes in guide plates arranged on both sides of a link plate at the end of the long connecting pin, the guide plate An auxiliary plate is stacked on the inside of the auxiliary plate, and the end of the short connecting pin is fitted into a hole in the auxiliary plate.

(e) Operation When the silent chain having the above configuration is endlessly connected and hung on a sprocket to operate the driving sprocket, power is applied to the silent chain, and power is transmitted from the silent chain to the driven sprocket. When tension is applied to the silent chain, a substantially equal shearing force is applied to the connecting pins as a whole.

(F) Embodiments Hereinafter, embodiments of the silent chain according to the present invention will be described with reference to the drawings.

1 and 2, a silent chain 1 according to this embodiment is shown. In the figure, 2 is a link plate in which a pair of teeth 3 and a pair of holes 4 are formed;
5 is a guide plate in which a pair of arcuate holes 6 are formed; 7;
and 8 are a long connecting pin (hereinafter referred to as long pin) and a short connecting pin (hereinafter referred to as short pin) which are inserted into the hole 4 so as to be mutually movable, and their shapes are similar to those of the conventional link plate shown in FIG. Same as guide plate and connecting pin. A plurality of link plates 2 are arranged horizontally with a gap equal to the thickness of the link plate to form a horizontal row.
Adjacent link plates are inserted into the gap, and connecting pins 7 and 8 are inserted into the holes 4 to connect them laterally and longitudinally 2, and guide them every other row on both outsides of the rows of link plates. A plate 5 is arranged. In this way, there are rows with guide plates on both sides (hereinafter referred to as guide rows) and rows without guide plates (hereinafter referred to as IJ).
V11), the l-4 silent chains are alternated.

In the present invention, a link plate 2 is provided between the inner side of the guide plate and the outer link plate of the link row.
An auxiliary plate 2a having the same shape as the guide plate 5 is placed overlapping the guide plate 5. The long pin 7 is fitted into the hole 6 of the guide plate and fixed by caulking the end. Further, the short bottle is inserted into the hole 4a of the auxiliary plate 2a stacked on the guide plate 5.

The silent chain 1 having the above structure is also hooked on the driving and driven sprockets in the same manner as the conventional silent chain, and transmits power from the driving sprocket to the driven sprocket. When tension is applied to the silent chain, the link plates of the guide row and the link plates of the link row are pulled in opposite directions, so that a shearing force is applied to the long pins 7 and short pins 8. In addition, near both ends of the long pin 7, two pins, a long pin and a short pin, are inserted up to the hole in the auxiliary plate, and conventionally the outermost link plate of the link row and the guide plate are opposite to each other. In the chain of the present invention, a shearing force that is approximately equal to the shearing force that would have been generated due to tension in the direction is generated between the outermost link plate and the auxiliary plate in the link row, so the connecting bins that can withstand the shearing force are also long and short. There are two pins, and the effective cross-sectional area is doubled. Therefore, the stress acting on the connecting bottles is also almost uniform, and the tensile strength is also increased.

Note that almost no shearing force acts between the guide plate 5 and the auxiliary plate because they receive a tensile force in the same direction.

(g) Effects The silent chain according to the present invention can have the following effects.

■ Breakage at both ends of the connecting pins can be completely prevented, and the allowable tensile strength of the chain can therefore be increased to the shear strength of the two connecting pins. This increases the strength of the sprocket teeth accordingly.

■ Conventionally, the number of link plates in the guide row is one less than the number of link plates in the link row, so the contact pressure of the sprocket per link plate is higher than that of the link plate in the guide row, and the contact surface with the sprocket This caused sagging and burrs, which impeded the movement of the link plates in the link row and worsened the chain's flexibility.
In the present invention, the number of link plates can be made the same in both the guide row and the link row, so the above-mentioned problem can be eliminated.

■ Since the link plate can be used as it is as an auxiliary plate, there is no need to make special parts and the cost can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view of a portion of an embodiment of the silent chain according to the present invention, with a portion of the guide plate removed. Fig. 2 is a sectional view taken along the line A-A in Fig. 1. Fig. 3 is a side view of a part of the conventional link plate, and Fig.
Is the diagram in Figure 3? ! A sectional view taken along IB-H, and FIG. 5 is a perspective view of a link plate, a guide plate, and a connecting bin of a conventional silent chain. 1.1': Silent Chain 2: Link Freight 3
: Drive tooth 4: Hole 5 guide plate 6: Hole 7.8: Connecting bottle Patent applicant Porg Warner O) a? Tape Co., Ltd. (5 others) Figure 5 (A) CB>(C)

Claims (1)

[Claims] A plurality of link plates each having a pair of driving teeth that engage with the teeth of a sprocket and a pair of holes are connected side by side in the horizontal and vertical directions by a pair of long and short connecting pins inserted into the holes, and the long connecting pins are connected side by side in the horizontal and vertical directions. In this silent chain, the ends of the short connecting pins are fitted and fixed into the holes of guide plates arranged on both sides of the link plate, and an auxiliary plate is arranged inside the guide plate to overlap the ends of the short connecting pins. A silent chain that is fitted into the hole of the auxiliary plate.