JPS60164042A - Silent chain in combination of link plates having different pressure angles of tooth surfaces - Google Patents

Abstract

PURPOSE:To prevent vibration and noise from being generation in order to prevent improper tooth mesh due to tooth jumps, etc., by making the periods of tooth mesh shocks on link plates different from each other so that vibrations and noises due to tooth mesh shocks on the link plates interfere with each other. CONSTITUTION:Link plates 2 having a pressure angle of alphaA of the surface of a tooth meshed with a sprocket 1, link plates 3 having a pressure angle of alphaB and link plates 4 having a pressure angle of alphaC are irregularly arranged and fitted onto connecting pins 5, 6, and guide places 7, 7 and 8, 8 in pairs guided by both side outside surfaces of the sprocket, for preventing the zigzaging of a silent chain and the separation thereof from the teeth of the sprocket, are forcedly fitted on both sides of the connecting pins 5, 6 so that a plurality of link plates 2, 3, 4 are clampled. With this arrangement, tooth mesh shock is generated, being dispersed and being successively so that the generation of noise and vibration may be relieved due to inerference between noises and between vibrations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention makes the timing of meshing with the sprocket teeth irregular, thereby alleviating the meshing impact vibration that occurs during meshing, suppressing noise, and increasing the strength of the meshing teeth of the chain. The present invention relates to a silent chain in which link plates having different meshing pressure angles are connected irregularly.

In the conventional silent chain, as shown in Fig. 1, the pressure angles of the meshing tooth surfaces Tl and T2 of each link plate LI+L2 of the silent chain C that meshes with the teeth of the sprocket S are all equal, so for example, the link plate connecting pin Multiple link plates L, L... on P
The point in time when the sprocket teeth come into contact with the meshing tooth surfaces of ... is the same time, so the respective link plates L
The impact noise and vibration caused by meshing with the sprocket teeth of L, L, .

This applies not only to each link plate on the same connecting bin mentioned above, but also to each link plate L+ connected in the longitudinal direction of the chain.

L2. Regarding LIIL2..., since the meshing collision points are repeated at regular pitches, meshing collision vibrations also occur at regular pitches and are magnified synergistically, which can cause noise and misalignment. .

In addition, in conventional silent chains, the pressure angles of the meshing tooth surfaces of each link plate are the same, so if the pressure angle is made smaller in order to reduce the meshing impact, the tooth thickness will be reduced and the strength of the teeth will be increased. On the other hand, if the pressure angle is increased to increase the strength of the teeth, the meshing impact will be large, and the separation force in the direction of the tooth surface will be large, resulting in the disadvantage that incorrect meshing such as tooth skipping is likely to occur. It had

Therefore, in the present invention, a plurality of link plates having different pressure angles on the tooth surfaces that mesh with the sprocket teeth are connected irregularly in one or both of the linking pin direction, the chain longitudinal direction, or both at the same time, thereby adjusting the meshing and collision period of each link plate. By making the link plates different, the meshing shock vibrations and noise of each link plate interfere with each other, suppressing the generation of vibration and noise, and preventing incorrect meshing such as tooth skipping while increasing the strength of the meshing teeth. Hereinafter, the present invention will be described in detail regarding the silent chain shown in FIGS. 2 and 3. Link plate 2 whose tooth surface meshing with sprocket tooth 1 has a pressure angle αA and link plate 3 whose pressure angle is αB and the link plate 4 whose pressure angle is αC are irregularly connected by connecting pins 5,
A pair of guide plates 7.7 and 8 are inserted and arranged on the connecting pin 5.6 at both ends of the connecting pin 5.6 to be guided by both outer surfaces of the sprocket to prevent the silent chain from meandering and from coming off from the sprocket teeth. 8 is firmly fitted, and the connecting pin 5.
A plurality of link plates 2°3.4 on 6 are sandwiched.

Therefore, as shown in FIG. 2, the sprocket teeth 1 engage the link plate 2 at the engagement point P8, the link plate 3 at the engagement point PB, and the link plate 4 at the engagement point Pc, so that the engagement points are dispersed. Furthermore, since the envelope surface constituted by the meshing surfaces of each link plate 2, 3.4 envelops the tooth surface of the sprocket tooth 1, the meshing impact occurs dispersedly and continuously, causing an impact. It is capable of alleviating and suppressing noise and vibration by causing mutual interference of vibrations.

Further, even if the link plays (2, 3, 4) having different pressure angles are arranged in the longitudinal direction of the chain, the meshing impacts of the leading teeth and the trailing teeth can interfere with each other, and the same effect can be obtained.

As mentioned above, link plates with a large pressure angle can increase the tooth thickness, which improves the tensile strength of the chain, and link plates with a small pressure angle have a small separation force in the direction of the tooth surface. This prevents misalignment such as tooth skipping, so while offsetting the disadvantages of both, the synergistic effect of the advantages of both makes it possible to obtain a silent chain with low vibration and noise and high tensile strength. The effect is significant.

[Brief explanation of drawings]

Fig. 1 is an enlarged front view of the main parts of a conventional silent chain when engaged, Fig. 2 is an enlarged explanatory view of the meshing collision between the link plate meshing south surface of the silent chain of the present invention and the sprocket tooth, and Fig. 3 is the present invention. FIG. 3 is an enlarged plan view of main parts showing an example of the arrangement of link plates in FIG. 1... Sprocket teeth 2.3.4... Link plays with different pressure angles 1 and 5.
6... To the connecting pin α, αB, αC... Pressure angles PA, PB, Pc - Meshing point agent Patent attorney Yujo - 1 other person Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] fil sprocket 7) A silent chain formed by irregularly connecting link plates whose tooth surfaces that mesh with teeth have different pressure angles. (2) The silent chain according to claim 1, in which the pressure angles of the tooth surfaces of the link plates in the connecting pin direction are different. (3) The silent chain according to claim 1, wherein the pressure angles of the tooth surfaces of the link plates in the longitudinal direction of the chain are different.