JPS62159829A - Silent chain - Google Patents

Abstract

PURPOSE:To reduce the periodic sound at the time of engagement and further to enhance durability by forming so that, at the time of engagement after the inside flanks have been brought into contact with the teeth of a sprocket, the outside flanks of the teeth of the other link plates are brought into contact with the same. CONSTITUTION:A link plate 2 has a pair of teeth 3 which is restricted by outside flanks 4 and inside flanks 5, and each of the outside flanks 4 is formed approximately in a straight line shape and each of the inside flanks 5 in a circular arc shape. In other words, denoting by P1 the pitch between the outside flanks 4 and 4 of a pair of teeth of a link plate 2 on the intermeshing pitch line, by P2 the pitch between the inside flanks 5 and 5 of teeth of two other link plates 2a, 2c engaging with a pair of teeth of the link plate when a silent chain 1 is stretched in a straight line, and by P3 the pitch between the same inside flanks when the silent chain 1 is wound on, it is so formed that P2> P1> P3 is satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a silent chain, and more particularly, the invention relates to a silent chain, and more particularly, when the inner flanks of the teeth of a link plate come into contact with the teeth of a sprocket when engaged with a sprocket, they By ensuring that the outer flanks of the teeth of the link plate of the pond mesh with the teeth of its sprocket.
This invention relates to a silent chain that reduces impact and noise during engagement.

(@Prior art) There are two commonly known silent chains: one in which the outer flank of the link plate contacts the teeth of the sprocket when it engages with the sprocket, and the other in which the inner flank contacts the teeth of the sprocket. In the former type, as shown in Figure 5, when the silent chain is stretched out almost in a straight line and wrapped around the sprocket, it forms a silent chain on the meshing pitch line. Outer flank C2 of a pair of teeth b2 of one link plate a2
is made to protrude outward from the inner flank d1 of the tooth b1 of the other link plate a1 which overlaps with that tooth, and when it engages with the sprocket, the outer flank on the rear side in the direction of movement is contacts teeth t of sprocket S, and when the silent chain is completely wrapped around the sprocket, the outer flank on the front side in the direction of movement also contacts the teeth of the sprocket, eliminating play between the teeth of the sprocket and the teeth of the link plate. It looks like this.

In this type of silent chain, the pitch P' + between the outer flanks on the meshing pitch line of a pair of teeth of one link plate a is the inner flank on the meshing pitch line of the teeth of the other two link plates that overlap with that tooth. It is always larger than the pitch P'2 between them.

On the other hand, as shown in FIG. 7, when the silent chain is stretched out in a substantially straight line and wrapped around the sprocket, the chain forming the silent chain is The outer flank c2 of the tooth b2' of the other link plate a2' with which the inner flank d t / of the pair Ib+' of one link plate a, J overlaps with its teeth.
When it engages with the sprocket, the front inner flank of one link plate in the direction of movement contacts the tooth t of the sprocket S, and the silent chain engages the sprocket. When completely wrapped around the link plate, the inner flank at the rear in the direction of travel of the previous link plate also comes into contact with other teeth of the sprocket, eliminating play between the teeth of the sprocket and the teeth of the link plate. In this type of silent chain, the pitch P1'' between the outer flanks on the meshing pitch line of a pair of teeth of one link plate a' is the pitch P1'' between the inner flanks on the meshing pitch line of the teeth of the other two link plates that overlap with that tooth. pitch P2 of
is always smaller than ″.

In such conventional silent chains, when the silent chain engages the sprocket, only the outer flanks or inner flanks of the overlapping link plates are dislocated, which can cause audible noise. .

Q9 Problem to be solved by the invention The problem to be solved by the invention is that when a silent chain engages with a sprocket, the outer flank of the tooth of one link plate and the inner side of the tooth of the other link plate that overlap with that tooth. By bringing the flanks into contact with the same tooth of the sprocket at the same time or at different times, it is possible to prevent wear of the link plate flanks and reduce the amount of wear.

(→ Means for Solving the Problems To solve the above problems, the present invention provides a pair of teeth, each defined by an inner flank and an outer flank;
In a silent chain formed by endlessly connecting a plurality of link plates each having a pair of holes into which a connecting member is inserted, the shape of the inner flank and the outer flank is such that the shape of the inner flank and the outer flank is such that the teeth of the pair mesh with each other and lie on the pitch line. Pl is the pitch between the outer flanks, P2 is the pitch between the inner flanks of the teeth of the other two link plates that mesh with the pair of teeth when the silent chain extends substantially straight, and The pitch between the inner flanks when wrapped around is P
3, P2 and P1=P3.

(υ Action) The silent chain with the above configuration is hung on a pair of sprockets, and power is transmitted between the sprockets.

When the chain 1~ chain engages with the sprocket, the outer flank of the tooth of the link plate and the inner flank of the tooth of the other link plate 1~ that overlaps with that tooth are simultaneously or at different times, and the outer flank of the tooth of the link plate contact the teeth.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a portion of a first embodiment of the silent chain of the present invention is shown.

In the figure, 1 is a silent chain, 2 is a link plate having a pair of teeth 3 defined by an outer flank 4 and an inner flank 5, and 7 is inserted into a hole 6 of the link plate 2, and the link plate is rotatable. This is a connecting member, that is, a connecting bottle.

This link plate 2 has an outer flank 4 formed in a substantially linear shape and an inner flank 5 formed in an arc shape, so that when the silent chain 1 is stretched substantially linearly, the meshing pitch of the overlapping teeth of adjacent link plates is fixed. ! The inner flank 5 is formed to protrude from the outer flank in the vicinity. That is, the pitch between the outer flanks of the pair of teeth of the link plate 2 on the meshing pitch line is P1, and the other link that overlaps the pair of teeth of one link plate 2 (2b) when the silent chain is stretched almost in a straight line. If the pitch between the inner flanks of the teeth of the plates 2 (2a, 2C) is P2, and the chain 1 wraps around the sprocket 10 to form an arc shape as shown in FIG. 3, one link plate ( For example, the pitch on the meshing pitch line of the teeth of two other link plates (for example, 2d and 2r in Figure 3) overlapping the pair of teeth 2e in Figure 3, or the pitch on the meshing pitch line of the teeth of a pair of link plates (for example 2d and 2r in Figure 3) that are connected to each other. 2e), when the pitch between the inner flanks on the meshing pitch line of teeth that do not overlap each other (the teeth on the right side of link plate 2e and the teeth on the left side of link plate 2d in the figure) is set as P3,
The inner flank 5 and outer flank of each link plate are formed as P2-Pl-P3. Here, yo means "equal."

Like a normal silent chain, the silent chain with the above structure is hung on the driving sprocket and the driven sprocket to transmit power between them, but when it engages with the teeth of the sprocket and after it engages with the teeth, it Different from conventional silent chains.

That is, as shown in FIG. 3, when the teeth of the link plate (the teeth on the right side of the link plate 2a and the teeth on the left side of the link plate 2b overlapping with the teeth on the right side in FIG. 3) mesh with the teeth 11 of the sprocket 10, P2=P1
= In the case of P3, the inner flank 5 of the right tooth of the link plate 2a first hits on or near the bitch circle r of the tooth of the sprocket 10, and in the case of P2 and PI4P3, the inner flank 5 of the right tooth of the link plate 2a hits the inside of the right tooth of the link plate 2a. At the same time, the outer flanks of the teeth on the left side of the link plays 1 and 2b that overlap with the flanks and their teeth are first aligned with the pitch circle r of the teeth of the sprocket 10.
It corresponds to the top or the vicinity. When the chain further advances and wraps around the sprocket, and the link plate rotates around the connecting pin 6, the outer flank 4 of the sprocket engages with the sprocket, and the teeth 11 of the sprocket engage with the sprocket, as shown in the link plate 2C in FIG. come into contact with. It remains in this state until it separates from the sprocket, meshing with the teeth of the sprocket and moving together.

In FIG. 4, a portion of another embodiment of the invention is shown. In this embodiment, the amount of protrusion of the inner flank of the link plate is set irregularly for each row of the link plate within the range of P2 > PI > P3. .

In this embodiment, the noise generated during engagement is made non-periodic, thereby reducing the harsh noise and the impact.

(0 effect According to the present invention, the following effects can be achieved.

■ When the silent chain meshes with the sprocket teeth, the inner flank contacts the sprocket teeth, and then the outer flank contacts the teeth in two stages, reducing and dispersing periodic noise when the silent chain meshes with the sprocket teeth. can.

■ The impact during meshing is alleviated and the durability of the contact surfaces of link plate teeth and sprocket teeth can be improved.

[Brief explanation of drawings]

Figure 1 is a side view of a part of an embodiment of the silent chain of the present invention, Figure 2 is a top view of the silent chain in Figure 1, and Figure 3 shows the silent chain in Figure 1 engaged with a sprocket. FIG. 4 is a side view of a part of another embodiment of the silent chain of the present invention, FIG. 5 is a diagram showing a part of an example of a conventional silent chain, and FIG. 6 is a side view of a part of an example of the conventional silent chain. 7 is a diagram showing a portion of another example of a conventional silent chain, and FIG. 8 is a diagram showing a state in which the lee silent chain of FIG. 7 is engaged with a sprocket. 1.1'... Silent chain 2... Link plate 3... Teeth 4.4'...
・Outer flank 5.5', 5"...Inner flank patent applicant Bork Warner ・Automotive Co., Ltd. 1"1'7T ・Agent: Patent attorney Kyo Yuasa
3.: N axis - Tougeno (5 others) Figure 1 Figure 2 Figure 5 Procedural amendment April 1986 - /q day

Claims (1)

[Claims] 1. A plurality of link plates, each having a pair of teeth defined by an inner flank and an outer flank, and a pair of holes into which a connecting member is inserted, are endlessly connected by the connecting member. In the silent chain, the shape of the inner flank and the outer flank is such that the pitch between the outer flanks on the pitch line with the pair of teeth meshing is P_1.
, P_2 is the pitch between the inner flanks of the teeth of the other two link plates that mesh with the teeth of the pair when the silent chain extends approximately in a straight line, and P_2 is the pitch when the silent chain is wrapped around the sprocket. When the pitch between the inner flanks is P_3, P_2■P_1
■A silent chain characterized by being formed to be P_3. 2. The silent chain according to claim 1, wherein link plates having different arcuate projection amounts of the inner flanks are irregularly arranged in the longitudinal direction of the silent chain.