JPH0574738B2 - - Google Patents

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a chain transmission device such as a silent chain or a roller chain used in automobiles, motorcycles, and various industrial machines. This invention relates to a low-noise chain transmission device that reduces noise generated during meshing.

(B) Prior Art In general, a roller chain transmission device is based on the fact that when the rollers of the chain mesh with the teeth of a sprocket, the rollers collide with the teeth at a certain speed. A metal-to-metal collision occurs between the roller and the bushing, which causes the roller to vibrate elastically, and the fluid between the roller and the bushing is rapidly drawn to one side, causing the fluid in that area to suddenly shift. This combination of movement and discharge creates noise.

Furthermore, although the silent chain transmission does not generate as much noise as the roller chain transmission described above, when the chain link plate collides with the sprocket at a predetermined angle of incidence, the link plate is excited and noise is generated.

Therefore, in order to prevent the chain roller from directly colliding with the sprocket tooth bottom, a low-noise chain transmission device is developed in which a buffer rubber ring is interposed between both ends of the roller or the roller is divided, or a buffer rubber is placed on the sprocket tooth bottom. being guided.

Furthermore, as shown in Japanese Utility Model Publication No. 12442/1983, a damper plate is fixed to the side surface of the sprocket, and the chain is configured to mesh with the sprocket while sliding on the damper plate, thereby reducing noise generation. has also been proposed.

(c) Problems to be Solved by the Invention However, in the case of using the above-mentioned cushioning rubber, repeated impact loads act on the rubber, which causes early deterioration of the rubber and causes problems in durability, as well as problems with silent chain transmission. Difficult to apply to equipment.

In addition, those using the above-mentioned damper plate,
Because the plate is placed on the side of the sprocket, damper plates made of spring steel and having relatively complicated shapes must be manufactured to fit sprockets of various sizes, which poses problems in mass production and also causes problems in silent damping. It is difficult to apply to chain transmissions.

Therefore, the present invention provides a low-noise chain transmission system in which a damper member such as a sprocket washer is provided on the chain, thereby improving durability, facilitating mass production, and also being applicable to silent chain transmission devices. The purpose is to provide a device.

(d) Means for solving the problem The present invention has been made in view of the above-mentioned circumstances, and as shown in FIGS. 1 to 3, for example, a large number of link plates 2... and these link plates A chain 5 having pins 3 connecting the
and a sprocket 6 that meshes with the chain, the pin 3
Damper members 7 made of an elastic material such as spring washers are provided at both ends of the sprocket, and flange members 9 are provided on both sides of the sprocket. It is characterized in that the member 7 is configured to contact the flange member 9.

(E) Effect Based on the above configuration, when the chain 5 engages with the sprocket 6, the damper member 7 first comes into contact with the flange member 9, and as the engagement of the chain 5 with the sprocket 6 progresses, the damper member 7 deforms. while sliding on the flange member 9 by friction. As a result, the energy caused by the collision of the chains is converted into deformation energy and thermal energy of the damper member 7, and the noise generated during meshing is significantly reduced.

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

The silent chain transmission device 1 consists of a silent chain 5 and a sprocket 6, as shown in FIGS. 1 and 2. silent chain 5
As shown in detail in FIG. 4, a large number of link plates 2 having two teeth 2a are alternately connected by pins 3, and guide link plates 2 without teeth are attached at both ends thereof. ', 2' are connected to form an endless structure. Furthermore, damper members 7, 7 made of sprocket washers are interposed at both ends of the pin 3 in a predetermined compressed state, and are prevented from coming off by caulking both ends of the pin 3. On the other hand, the sprocket 6 has many teeth 6a on its outer periphery.
..., and a boss portion 6c is formed via a step 6b formed on both sides of the tooth portion. A ring-shaped flange member 9 made of steel, plastic, hard rubber, etc. is fitted into both the stepped portions 6b, 6b (see FIG. 5), and the bolt 1
1 to the sprocket 6, and the flange member 9 has a tapered surface 9a extending outward on its outer periphery. In addition, bolt 1
1 may be fixed by tightening with a nut 12, as shown in the upper half of FIG. It may be fixed. By attaching the flange members 9, 9, the tapered surface 9a
A groove 13 for the guide link plate 2' of the chain is formed between the sprocket tooth 6a and the side surface of the sprocket tooth 6a.
Further, the damper member 7 is configured to come into contact with the tip of the tapered surface 9a immediately before the link plate teeth 2a of the chain are seated on the sprocket teeth 6a.

Since this embodiment has the above-described configuration, the silent chain 5 meshes with the sprocket 6 to transmit power. At this time, the teeth 2a of the link plate 2 engage with the teeth 6a of the sprocket 6, and the guide The link plate 2' engages with the groove 13,
This prevents the chain 5 from moving laterally and coming off the sprocket 6 during operation. and,
When the link plate 2 enters the sprocket 6, just before the tooth 2a on the front side of the link plate 2 seats on the sprocket tooth 6a, as shown in detail in FIG. 3, the pin 3 on the front side of the link plate 2 The damper member 7 fitted therein contacts the tapered surface 9a of the flange member 9, and the link plate 2
As the teeth 2a are seated on the sprocket teeth 6a and the engagement progresses, the damper member 7 is compressively deformed and moves while frictionally sliding on the tapered surface 9a. As a result, the impact energy of the link plate 2a on the sprocket tooth 6a is converted into deformation energy and thermal energy of the damper member 7, and the vibration of the link plates 2 and 2' is also caused by the compressive deformation of the damper member 7. This greatly reduces noise generation.

Next, partially modified embodiments are shown in FIGS. 6 and 7.
This will be explained along the diagram.

In this embodiment, the damper member 7 is constructed by combining two spring washers 7a, 7a, and the flange member 9 has a thicker thickness T in accordance with the thicker damper member 7. It is configured.

Therefore, in this embodiment, the amount of deformation of the damper member 7 is large, and the energy absorption due to the deformation can be increased, and the sliding contact with the tapered surface 9a of the flange member 9 is made smooth, thereby more reliably preventing noise generation. It can be decreased.

FIG. 8 is a diagram showing a further modified embodiment, in which the damper member 7 consists of a spring washer 7a and an O-ring 7c interposed between the washer and the guide link plate 2'.

Therefore, like the previous embodiment, in this embodiment, in addition to the large amount of deformation of the damper member 7, the presence of the O-ring 7c made of rubber reduces the propagation of vibration and sound caused by the metal. By blocking the noise, the noise generation can be reduced more reliably.

Although the above embodiments have all been applied to silent chain transmissions, it is of course applicable to other chain transmissions such as roller chain transmissions.

(G) Effects of the Invention As explained above, according to the present invention, the damper member 7 made of an elastic body comes into contact with the flange member 9 immediately before the chain 5 seats on the sprocket 6, and as the engagement progresses, the damper member 7 Since the damper member 7 frictionally slides on the flange member 9 while being deformed, the collision energy when the chain meshes with the sprocket is converted into deformation energy and thermal energy of the damper member 7, thereby reliably preventing the generation of noise. However, the damper member 7, which is made of a spring washer or the like, only contacts the flange member 9 and does not carry the transmitted torque, and prevents the damper member 7 from wearing out or buckling, thereby increasing the durability of the chain. Furthermore, the damper member 7 is composed of a spring washer, etc., and can be easily and automatically assembled when assembling a chain, and mass production is easy. , can be applied to any chain transmission device.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a chain transmission device according to the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1,
FIG. 3 is an enlarged sectional view of the main part. Figure 4 is a diagram showing the silent chain, a is a plan view,
b is a side view, and c is a sectional view taken along line cc.
FIG. 5 is a cross section showing the flange member. Also,
FIG. 6 is a plan view showing a silent chain according to a partially modified embodiment, and FIG. 7 is a sectional view of the main part thereof. FIG. 8 is a plan view showing a silent chain according to a further modified embodiment. DESCRIPTION OF SYMBOLS 1... (silent) chain transmission device, 2... link plate, 2a... tooth, 3... pin, 5... (silent) chain, 6... sprocket, 6a...
Teeth, 7... Damper member, 9... Flange member, 9a
...Tapered surface.

Claims (1)

[Scope of Claims] 1. A chain transmission device comprising a chain having a large number of link plates and pins connecting these link plates, and a sprocket that meshes with the chain, wherein spring washers are provided at both ends of the pin. A damper member made of an elastic material such as the following is provided, and flange members are provided on both sides of the sprocket, so that the damper member contacts the flange member immediately before the chain seats on the sprocket. A low-noise chain transmission device characterized by: 2. The low-noise chain transmission device according to claim 1, wherein the chain transmission device is a silent chain transmission device.