JP3122072B2 - Silent chain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent chain used for a timing chain of an automobile.

[0002]

2. Description of the Related Art Conventionally, a silent chain widely used in a timing chain of an automobile engine has a plurality of articulated row plates A1 and guide row plates A2 having meshing teeth T meshing with sprockets as shown in FIG. Guide plates A4, which are alternately connected by pins A3 and are guided by contacting the inner surface when meshing with the side surfaces of the teeth of the sprocket, are arranged on both outer sides of the plurality of guide row plates A2.

The meshing teeth T are formed on the inner peripheral side when the joint row plate A1 and the guide row plate A2 are knotted endlessly and knitted as a silent chain A5, and are all formed on the outer peripheral side. Plates A1, A2
The back surface S, S ′, S ″ of A4 is formed as a flat surface.

FIG. 4 shows the above-mentioned silent chain A5.
FIG. 5 is a side view showing an example of a chain transmission of an engine using the same as a timing chain, wherein a silent chain A5 is provided between a driving sprocket A6 connected to a crankshaft and a driven sprocket A7 connected to a camshaft. The rotation of the driving sprocket A6 is transmitted to the driven sprocket A7 via the silent chain A5.

A chain guide A8 is provided along the outer periphery of the tension side of the silent chain A5. The chain guide A8 makes the shoe surface a slidably contact the silent chain A5 to reduce the run-out of the silent chain A5 during running. Restrained.

[0006] A tensioner lever A9 is provided along the outer circumference of the silent chain A5 on the slack side. The tensioner lever A9 is rotatably supported around a support shaft A10, and is always urged by the tensioner A11 to rotate toward the silent chain A5. By pressing the outer periphery, the slack of the silent chain A5 is removed to suppress runout.

[0007]

In the above-described conventional silent chain A5, the back surfaces S, S ', and S "of the joint row plate A1, the guide row plate A2, and the guide plate A4 are arranged so that the silent chain A5 is straight. It is formed so as to be located in the same plane when extended in a shape.

Therefore, the rear surfaces S, S ', S "of all the plates A1, A2, A4 of the silent chain A5 passing through the positions of the chain guide A8 and the tensioner lever A9 as shown in FIG. , B, but has a problem that, unlike the roller chain, the number of plates in the width direction is large, so that the sliding resistance is increased, causing a power loss and generating a large sliding noise.

In addition, since a driving torque against the sliding resistance is required, the tension applied to the silent chain is increased, and the wear extension of the silent chain and the wear of the shoe surface of the chain guide and the tensioner lever occur early. There were also problems.

Further, when the driving torque is increased, the strength of the silent chain and sprocket must be increased. Therefore, there is a problem that the size and weight of these parts increase. Particularly, in the timing chain of the engine,
There are problems that cause an increase in the weight of the entire engine, a decrease in fuel efficiency, a power down, and the like.

Therefore, the present invention solves the above-mentioned problems of the prior art, reduces the sliding resistance between the chain guide and the shoe surface of the tensioner lever, and reduces power loss and sliding noise. The purpose is to provide a silent chain that can be used.

[0012]

In order to achieve the above object, the silent chain of the present invention comprises a plurality of articulated plates and guide line plates having meshing teeth meshing with sprocket teeth formed on the inner circumferential side of the chain. Guide plates which are alternately connected by pins, and which are guided by contacting the inner surface when meshing with the side surfaces of the teeth of the sprocket, are arranged on both outer sides of the plurality of guide row plates. The guide row plate and the guide plate have a rear surface formed on a flat surface located substantially in the same plane when the chain is extended, and the other joint row plate has a rear surface formed at a lower height than the flat surface, The height of the back surface of the guide plate is formed slightly lower than the back surface of the guide row plate.

[0013]

The guide row plate and the guide plate of the present invention have a rear surface formed on a flat surface which is located substantially in the same plane when the chain is extended, and the other articulated plate has a rear surface formed at a lower height than the flat surface. As a result, the area of the entire back surface of the plate that is in sliding contact with the shoe surface of the chain guide and tensioner lever located on the outer periphery of the chain is small, and the friction resistance during chain running is lower than that of a normal silent chain. Decrease. Further, the height of the rear surface of the guide plate is formed slightly lower than the rear surface of the guide row plate, so that when the rear surface of the guide row plate is shifted to the pin side, only the rear surface is mounted on the shoe surface such as a chain guide. There is no one hit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial perspective view showing one embodiment of a silent chain (hereinafter, simply referred to as a chain) of the present invention. A chain 11 includes a plurality of joint row plates 12, a plurality of guide row plates 13, and a plurality of guide row plates 13. It is constituted by guide plates 14 arranged on both outer sides of the guide row plate 13 and pins 15 connecting these plates 12, 13, 14.

The pins 15 are inserted through a pair of pin holes 16 formed in the joint row plate 12 and the guide row plate 13, and both ends are press-fitted into pin holes 16 A of the guide plate 14. The joint row plate 12 and the guide row plate 13 are respectively
A pair of meshing teeth T meshing with the teeth of a sprocket (not shown) are formed on the inner peripheral side when 1 is knitted endless.

Further, the guide plate 14 is formed in a linear shape so that an inner peripheral side edge thereof covers a space between a pair of meshing teeth T of the guide row plate 13, and the inner side surface is meshed with the sprocket. The sprocket is guided in contact with the side surface of the tooth.

On the other hand, the back surfaces S, S ', of all the plates 12, 13, 14 on the outer peripheral side of the chain 11, respectively.
S "are all formed on a flat surface, and the back surfaces S of all the joint row plates 12 are located in the same plane when the chain 11 is linearly extended as shown in FIG. The back surface S 'of the plate 13 and the guide plate 14
Of the rear surface S ″ is located in the same plane as the plane including the rear surface S.

FIG. 2 shows the pin 1 of the chain 11 shown in FIG.
5 shows a cross section at a position 5. As shown in the figure, the back surface S ′ of the guide row plate 13 and the back surface S ″ of the guide plate 14 are located between the back surface S of the joint row plate 12. There is a height difference d, which protrudes from the back surface S of the joint row plate 12.

Therefore, when the chain 11 is run across a plurality of sprockets and driven to travel, the shoe surface of a chain guide or tensioner lever (not shown) arranged on the outer periphery of the chain 11 And the back surface S "of the guide plate 14 in sliding contact, the frictional resistance when the chain 11 slides on these shoe surfaces is reduced.

In this embodiment, the guide row plate 13
The height difference d between the back surface S 'of the joint row plate 12 and the back surface S of the joint row plate 12 is such that the height H from the tip of the meshing tooth T of the guide row plate 13 to the back face S' is 6.6 to 6.7 mm. 1
In the case of 1, the thickness is preferably about 0.1 to 0.2 mm.

The pins 15 are firmly fitted at both ends into the pin holes of the guide plate 14, whereas the pins 15 do not fit into the pin holes of the guide row plate 13 disposed between the guide plates 14. Is loosely inserted, so that the back surface S ′ of the guide row plate 13 and the back surface S ″ of the guide plate 14 are formed at exactly the same height,
When the back surface S 'of the guide row plate 13 approaches the pin 15 side, there is a possibility that only the back surface S "of the guide plate 14 may hit the shoe surface of the chain guide or the like. As shown in FIG. Back surface S "of guide plate 14
Is formed slightly lower than the back surface S ′ of the guide row plate 13, that is, about 0.05 mm lower,
This eliminates the possibility that only the rear surface S ″ of the guide plate 14 may hit the shoe surface of the chain guide or the like.

Further, since the guide row plate and the back face of the remaining joint row plate immersed from the back face of the guide plate do not make sliding contact with the shoe face of the chain guide or the tensioner lever, it is not necessarily formed as a flat face. You don't have to. Further, in each of the embodiments described above, a round pin is used as the pin, but a rocker pin may be used.

[0023]

As described above, the back face of the guide row plate and the guide plate of the present invention is formed on a flat surface which is located substantially in the same plane when the chain is extended, and the back face of the remaining joint row plate is flat. The height of the lower surface is lower than the surface of the chain, so that the entire area of the rear surface of the plate that is in sliding contact with the shoe surface of the chain guide or the tensioner lever can be reduced, so that the sliding surface received from these shoe surfaces during chain running can be reduced. Dynamic resistance is reduced, and power loss and sliding noise can be reduced.

Further, since the driving torque required to counter the sliding resistance can be reduced, the tension acting on the chain is reduced, and the wear elongation of the chain and the wear of the shoe surface can be reduced. Further, since the strength required for the chain and sprocket is small, the size and weight of these components can be reduced.

Further, since the height of the rear surface of the guide plate is formed slightly lower than the rear surface of the guide row plate, when the rear surface of the guide row plate approaches the pin side, a shoe such as a chain guide is formed. Only the back of the guide plate does not hit against the surface.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing one embodiment of a silent chain of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the silent chain of the present invention.

FIG. 3 is a partial perspective view of a conventional silent chain.

FIG. 4 is a diagram showing an example of a conventional chain transmission using a silent chain.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Chain 12 Joint row plate 13 Guide row plate 14 Guide plate 15 Pin 16, 16A Pin hole S, S ', S "

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toyonaga Saito 4-17-96, Tsurumi-ku, Tsurumi-ku, Osaka-shi, Osaka Tsubakimoto Chain Co., Ltd. (56) References JP-A-10-122308 (JP, A) Hei 3-20748 (JP, U) Jikaichi Sho 56-29012 (JP, U) Jiko 47-19440 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16G 13 / 02-13/10 F16H 7/00-7/24

Claims (1)

(57) [Claims] A plurality of articulation plates and guide row plates formed on the inner peripheral side of the chain and having meshing teeth meshing with sprocket teeth are alternately connected to each other by pins, and when meshing with the side surfaces of the sprocket teeth. In a silent chain in which guide plates whose inner surfaces are guided in contact with each other are arranged on both outer sides of the plurality of guide row plates, the back of the guide row plates and the guide plates of these plates is substantially the same when the chain is extended. The other joint row plate is formed on a flat surface located in the same plane, and the back surface of the joint row plate is formed at a lower height than the flat surface, and the height of the back surface of the guide plate is higher than that of the guide row plate. Silent chain characterized by being formed slightly lower.