JP3081195B2 - Double sided silent chain and double sided silent chain sprocket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-side mesh type silent chain capable of meshing with a sprocket on both the inner and outer peripheral sides of a chain, and a sprocket used for the double-side mesh silent chain.

[0002]

2. Description of the Related Art Conventionally, in a timing chain or the like used for transmitting the rotation of an engine crankshaft to an auxiliary shaft such as a camshaft or an oil pump, both the inner and outer sides of the chain are used. There is a silent chain that can mesh with a sprocket or a toothed pulley provided on a driven shaft, and is used, for example, when rotating the inner and outer driven shafts of the chain in opposite directions. Have been.

FIG. 17 shows an example of this type of chain that has been conventionally proposed. A chain A1 knitted endlessly meshes with a sprocket A2 arranged on the inner peripheral side thereof. At the same time, the vehicle is driven to run in a state of being meshed with the toothed pulley A3 arranged on the outer peripheral side.

The chain A1 is formed by connecting three types of plates having different shapes to each other with pins A4. That is, as shown in FIG. 18, guide plates A5 arranged at every other pitch on both outer sides in the chain width direction.
Has a linear edge a on the inner circumferential side of the chain, and two small meshing teeth b meshing with the toothed pulley A3 protrude from both ends in the longitudinal direction on the outer circumferential side.

A guide plate A5 adjacent to the front and rear
The plate A6, which is adjacent to the inside of each of them and has both ends pin-connected, has two meshing teeth c meshing with the sprocket A2 on the inner circumferential side of the chain, and two meshing teeth with the toothed pulley A3 on the outer circumferential side. Two small meshing teeth b are respectively formed.

Further, all of the plates A7 and A8 other than the guide plate A5 and the plate A6 adjacent to the inside of the guide plate A5 have two meshing teeth c meshing with the sprocket A2 on the inner peripheral side.
Are formed, and the outer peripheral side is constituted by a flat back surface d.

A standard tooth profile is used for the meshing teeth c on the inner circumferential side of the chain and the sprocket A2 meshing with the meshing teeth c. The tooth shape of the pulley A3 has a non-standard shape.

[0008]

The above-described conventional double-sided silent chain is knitted by combining three types of plates having different shapes. It is necessary to prepare a plate type corresponding to the shape of the device, and the number of types of parts to be managed in the assembling process is increased.

Further, since the meshing teeth on the outer peripheral side of the chain are smaller than the standard tooth profile, when a high load torque acts on the toothed pulley arranged on the outer peripheral side, the meshing with the chain is reduced. Since it slips off, the torque that can be transmitted is smaller than that of the sprocket on the inner circumferential side of the chain, and there is a problem that devices that can be rotationally driven on the outer circumferential side of the chain are greatly limited.

Further, the guide plate is heavy since it has no meshing teeth on the inner peripheral side of the chain and has a straight edge portion, so that the entire chain is heavy, and the sprockets and the teeth There was a problem that the operating noise increased due to an increase in the collision energy with the pulley.

If the weight of the chain is large, the tension increases due to the centrifugal force during traveling, so that the wear of the shoe surface of the chain guide and the like and the elongation of the chain are promoted. When the chain is used as an engine timing chain, there is a possibility that the timing drive of the engine is adversely affected.

Accordingly, the present invention solves the above-mentioned problems of the prior art, improves productivity, reduces manufacturing costs, and has a large driving force between the sprocket meshing with the outer periphery of the chain. To provide a double-side mesh type silent chain that can transmit tension and equalize the tensile strength of each row, and is compatible with the double-side mesh type silent chain, has high transmission efficiency and reduces run-out during running of the chain. It is an object to provide a sprocket that can be suppressed.

[0013]

For this purpose, the double-sided mesh silent chain of the present invention has a pair of meshing teeth, and a flat back surface is formed on the opposite side of the meshing teeth. The same side plates are used for all plates, and odd-numbered rows and even-numbered rows of these plates in the chain width direction are connected by adjacent plate pins and alternately arranged in the chain longitudinal direction. The plates arranged on both outer sides of each row have mesh teeth facing the chain outer periphery, and all the remaining plates are double-side mesh silent chains knitted with the mesh teeth facing the chain inner periphery. A plate disposed outside the odd-numbered rows, a plate disposed outside the even-numbered rows, and a plate disposed inside the even-numbered rows. DOO is is used of the same thickness, the plate being disposed inside the odd aligned columns, thinner than they are used.

It is desirable that the meshing teeth of each plate protrude from the back of oppositely facing plates in the same row.

The first sprocket for a double-sided silent chain according to the present invention is used by meshing with the outer peripheral side of the double-sided silent chain according to the present invention. Sprocket teeth meshing with the meshing teeth of the plate with the meshing teeth are formed on the outer periphery, and the sprocket teeth are formed with a plate supporting surface for supporting a flat plate rear surface facing the chain outer circumferential side. .

A second sprocket for a double-ended mesh silent chain according to the present invention is used by meshing with the outer peripheral side of a double-ended mesh silent chain according to the present invention, similarly to the first sprocket described above. A plate receiving portion having a cylindrical outer peripheral surface abutting on a flat plate rear surface facing the chain outer peripheral side, and provided concentrically on both left and right sides of the plate receiving portion, and respectively meshed with the chain outer peripheral side. And a pair of meshing portions formed on the outer periphery with sprocket teeth meshing with meshing teeth of the plate with the facing teeth.

A third sprocket for a double-side mesh silent chain according to the present invention is used by meshing with the inner peripheral side of the double-side mesh silent chain according to the present invention. The sprocket teeth meshing with the meshing teeth of the plate with the meshing teeth facing to the side are provided on the outer periphery of the meshing portion, and concentrically provided on both left and right sides of the meshing portion, each facing the inner circumferential side of the chain. And a pair of plate receiving portions having a cylindrical outer peripheral surface in contact with the rear surface of the flat plate.

In the above-described second and third sprockets for a double-side mesh silent chain according to the present invention, when the outer peripheral surface of the plate receiving portion comes into contact with the flat plate rear surface, the sprocket It is desirable for the teeth to mesh with the meshing teeth of the opposing plate radially outside the mesh pitch circle.

Further, a fourth sprocket for a double-side mesh silent chain according to the present invention is used by meshing with the outer peripheral side of the double-side mesh silent chain according to the present invention. It has a pair of left and right meshing parts formed on the outer circumference with sprocket teeth meshing with the meshing teeth of the plate with the meshing teeth facing, respectively, and a cylindrical outer peripheral surface, and the pair of meshing parts are integrated concentrically. And an inner diameter larger than the outer diameter of the buffer ring receiving portion, which is mounted on the outer periphery of the buffer ring receiving portion in a state where axial movement is restricted between the meshing portions on both sides, and is freely floating. And a buffer ring.

The buffer ring abuts against a flat plate back surface whose outer peripheral surface is opposed before and after the position where the meshing teeth of the plate mesh with the sprocket teeth, and at the position where the meshing teeth mesh with the sprocket teeth, the outer peripheral surface is formed. Is configured so that the inner peripheral surface is in contact with the outer peripheral surface of the buffer ring receiving portion away from the back surface of the plate.

A fifth sprocket for a double-sided silent chain according to the present invention is used by being meshed with the inner peripheral side of the double-sided silent chain according to the present invention. The sprocket teeth meshing with the meshing teeth of the plate with the meshing teeth facing to the side have meshing portions formed on the outer periphery, and cylindrical outer peripheral surfaces respectively, and are provided concentrically on the left and right sides of the meshing portion. The pair of buffer ring receiving portions, and in a state in which movement in the axial direction with respect to each of the buffer ring receiving portions is regulated, the outer diameter of the buffer ring receiving portion is attached to the outer periphery of the buffer ring receiving portion so as to be free to float. A pair of buffer rings having a large inner diameter.

Each of the cushioning rings comes into contact with the flat plate rear surface whose outer peripheral surface is opposed before and after the position where the meshing teeth of the plate mesh with the sprocket teeth, and at the position where the meshing teeth mesh with the sprocket teeth. The outer peripheral surface is configured such that the inner peripheral surface is away from the back surface of the plate and the inner peripheral surface is in contact with the outer peripheral surface of the buffer ring receiving portion.

[0023]

The double-sided silent chain according to the present invention
The side shapes of the plates are all the same, and the plates arranged on both outer sides of each row among these plates have the meshing teeth facing the chain outer peripheral side. , And power is transmitted to the sprocket on the outer peripheral side.

On the other hand, the meshing teeth of the remaining plates are all directed to the inner circumferential side of the chain, and these meshing teeth are meshed with sprockets arranged on the inner circumferential side of the chain to be interlocked with the inner circumferential sprocket. Power transmission is performed. Then, power transmission is performed by equalizing the tensile strength of each row.

If the meshing teeth of each plate protrude from the rear surface of the opposite plate in the same row, the rear surface of the plate on the outer peripheral side of the chain slides on the shoe surface of the chain guide or the tensioner lever. By making dynamic contact, the inner surfaces of the meshing teeth protruding to both outer sides of these plates can be guided to both side surfaces of the shoe surface such as a chain guide.

The first sprocket for a double-ended mesh silent chain of the present invention is used by being engaged with the outer peripheral side of the double-ended mesh silent chain of the present invention.

This sprocket is formed on the sprocket teeth while the meshing teeth of the plates arranged on both outer sides of each row and the sprocket teeth of the plates forming the chain mesh with each other to transmit power. The plate support surface abuts against the flat plate back facing the outer circumference of the chain to receive the reaction force of the running chain, share the load received by the sprocket teeth, increase durability, and suppress chain runout Plays the role of chain guide.

A second double-side mesh type silent chain sprocket of the present invention has sprocket teeth meshing with meshing teeth on the chain outer peripheral side on the outer periphery of each of a pair of meshing portions. High torque power transmission can be performed by meshing with the outer peripheral side of the double-side mesh silent chain of the present invention.

The outer peripheral surface of the plate receiving portion of this sprocket smoothly contacts the flat plate rear surface facing the outer peripheral side of the chain to receive the reaction force of the chain, thereby reducing the load applied to the sprocket teeth. And play a role in increasing the durability of the sprocket.

The outer peripheral surface of the plate receiving portion also plays a role of suppressing vibration and noise caused by the polygonal movement of the chain.

The third sprocket for a double-sided mesh silent chain of the present invention is formed on the outer periphery of the meshing portion when the sprocket is meshed with the inner peripheral side of the double-sided mesh silent chain of the present invention. The sprocket teeth mesh with the meshing teeth facing the inner circumferential side of the chain to transmit power between the chain and the outer peripheral surfaces of a pair of plate receiving portions provided on both left and right sides of the meshing portion. Abuts against the back of the flat plate facing the inner circumference of the chain to bear the reaction force of the chain.

The outer peripheral surfaces of these plate receiving portions play a role of suppressing vibration and noise caused by the polygonal movement of the chain.

In the above-mentioned second and third sprockets for a double mesh type silent chain according to the present invention, when the outer peripheral surface of the plate receiving portion comes into contact with the flat plate rear surface, the sprocket teeth are formed. In the case where the outer peripheral surface of the plate receiving portion is formed radially outside of the mesh pitch circle so as to mesh with the meshing teeth of the opposing plate before the meshing teeth of the chain mesh with the sprocket teeth. Since the back of the plate is pushed up and deflected radially outward, the sprocket teeth mesh with the mesh teeth of the chain outside the mesh pitch circle, and the sprocket radial load acting between the mesh of the chain and the sprocket teeth is large. To be reduced.

Further, the fourth sprocket for a double-sided mesh silent chain of the present invention, when meshing with the outer peripheral side of the double-sided mesh type silent chain of the present invention, firstly intervenes between a pair of meshing portions. The outer peripheral surface of a buffer ring abuts against the flat plate back facing it.

At this time, when the back surface of the plate collides with the outer peripheral surface of the buffer ring, the buffer ring floats around the buffer ring receiving portion, absorbs the energy of the collision, and reduces the impact.
When the meshing teeth on both sides of each row of the chain are brought into mesh with the sprocket teeth by the movement of the chain, the outer peripheral surface of the buffer ring separates from the back of the plate. It comes into contact with the outer peripheral surface of the receiving part.

Then, as the chain further moves, the outer peripheral surface of the buffer ring again comes into contact with the back surface of the opposed plate, and the mesh between the sprocket teeth of each meshing portion and the meshing teeth of the corresponding plate. Guide the chain away.

Further, the fifth sprocket for a double-sided mesh type silent chain of the present invention, when engaging with the inner peripheral side of the double-sided mesh type silent chain of the present invention, firstly on the left and right sides of the meshing portion. The outer peripheral surface of the buffer ring comes into contact with the flat plate rear surface facing each other.

At this time, when the plate rear surface collides with the outer peripheral surface of each buffer ring, these buffer rings float around the buffer ring receiving portion and absorb the collision energy to reduce the impact.

Thereafter, when the meshing teeth come to the meshing position with the sprocket teeth due to the movement of the chain, the outer peripheral surfaces of the respective buffer rings are separated from the back surface of the plate. Each comes into contact with the outer peripheral surface of the buffer ring receiving portion.

Then, as the chain further moves, the outer peripheral surface of each buffer ring comes into contact with the back surface of the facing plate again, and the meshing between the sprocket teeth of the meshing portion and the meshing teeth of the corresponding plate. Guide the chain away.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a double mesh type silent chain of the present invention, and FIG. 2 is a plan view thereof.
A double-side mesh silent chain (hereinafter simply referred to as a chain) 1 is a plate 2A having the same side shape.
2B, 2C, and 2D are used.

These plates 2A, 2B, 2C, 2D
Has a pair of meshing teeth T having a shape used for a standard silent chain, and a flat back surface S is formed on the opposite side of the meshing teeth T.

The chain 1 includes an odd number of plates in which two plates 2A are arranged on both outer sides of three plates 2C, and two plates 2B on both outer sides of two plates 2D. The rows of the arranged even number of plates are connected with adjacent plates by pins 3 and are alternately arranged in the longitudinal direction of the chain 1.

Plates 2 arranged on both outer sides of each row
A and 2B turn the meshing teeth T toward the outer peripheral side of the chain 1,
The remaining plates 2C and 2D are all knitted endlessly with the meshing teeth T facing the inner circumference.

A plate 2A disposed on both outer sides of the row of odd-numbered plates; and a plate 2B disposed on both outer sides of the row of even-numbered plates.
The plates 2D arranged inside the row of the even-numbered plates have the same thickness, and the plates 2C arranged inside the row of the odd-numbered plates are these plates. Those thinner than 2A, 2B and 2D are used. That is, the plates 2A and 2B having the meshing teeth T facing the outer peripheral side of the chain 1 and the plate 2D in the same row as the plate 2B have the same thickness, and the plate 2C has a smaller thickness. It is used to equalize the tensile strength of each row.

In this embodiment, the meshing teeth T of each plate are connected by pins 3 at positions protruding from the back surface S of the oppositely facing plate in the same row, and the chain 1
The back surface S of the plates 2C and 2D facing the outer peripheral side of the plate 2C is brought into sliding contact with the shoe surface of the chain guide or the tensioner lever, and the inner surface of the meshing teeth T of the plate 2B protruding outward on both sides is chain guide or the like. Can be guided on both sides of the shoe surface.

Further, the inner surface of the plate 2B whose back surface S faces the inner peripheral side is guided by the side surface of the teeth of a sprocket (not shown) that meshes with the inner peripheral side of the chain 1, and the plate 2B is a normal silent chain. It serves as a guide plate.

The meshing teeth T of the plates 2A, 2B are connected with the pins 3 at the same height as the rear surfaces S of the oppositely facing plates 2C, 2D in the same row, or at a position immersed therefrom. In such a case, it is possible to use a chain guide or a tensioner lever having a shoe surface width equal to or larger than the width of the chain 1.

FIG. 3 is a side view showing a first embodiment of a sprocket for a double-sided silent chain according to the present invention, and FIG. 4 is a partial cross-sectional view taken along the line AA in FIG. In the figure, a sprocket 4 of the present invention is used by being arranged on the outer peripheral side of the above-described chain 1.

The sprocket teeth t provided on the outer periphery of the sprocket 4 are formed in a standard tooth profile compatible with the meshing teeth T of the chain 1, and a central portion of the sprocket teeth t in the width direction on the tooth tip side. Is formed with a notched plate support surface K with which the back surfaces S of the plates 2C and 2D of the chain 1 abut. The plate support surface K is formed as a part of a cylindrical surface concentric with the rotation center of the sprocket 4.

The sprocket 4 is formed slightly wider than the maximum width of the chain 1. The sprocket 4 is formed at the center of the tooth tip of the meshing tooth of a ready-made sprocket having meshing teeth for a standard silent chain formed on the outer peripheral surface. It can be easily manufactured by subjecting only to machining.

Incidentally, both side portions of the plate supporting surface K of the sprocket teeth t and the respective meshing teeth T of the plates 2A, 2B arranged on both sides of the chain 1 mesh with each other in the same manner as a normal silent chain. Power transmission is performed.

At this time, the plate supporting surface K is
C and 2D are brought into contact with the rear surfaces S to guide and support them, and a part of torque is transmitted between the chain 1 and the sprocket 4 by the frictional force acting between these rear surfaces S and the plate supporting surface K. You. Further, the plate support surface K receives the reaction force of the chain 1 and plays a role of increasing the durability of the sprocket 4 by sharing the load applied to the sprocket teeth t.

Next, FIG. 5 is a side view showing a second embodiment of a sprocket for a double-side mesh silent chain according to the present invention, and FIG. 6 is a view taken along the line BB in FIG. FIG. 7 is a cross-sectional view of the sprocket 4 ′ of the present embodiment, in which a plate supporting surface K ′ that abuts against the back surface S of the plates 2C and 2D is formed at a tip portion over the entire width of the sprocket teeth t of the sprocket 4 ′. Thus, similarly to the sprocket 4 of the above-described embodiment, the sprocket tooth for a standard silent chain can be manufactured by machining the tip of an existing sprocket having an outer peripheral surface formed over the entire width.

FIG. 7 is a side view showing a third embodiment of a sprocket for a double-sided silent chain according to the present invention, and FIG. 8 is a partial cross-sectional view taken along the line CC in FIG. FIG.
Also, like the sprockets 4 and 4 'of the above-described embodiments, the sprockets are used by meshing with the outer peripheral side of the chain 1.

In the sprocket 14 of the present embodiment, a plate receiving portion 14A having a cylindrical outer peripheral surface R abutting on the back surface S of each of the plates 2C and 2D facing the outer peripheral side of the chain 1, and the left and right sides of the plate receiving portion 14A. It is composed of a pair of meshing portions 14B arranged adjacent to both sides, and the two are joined so as to rotate integrally with each other by means such as screws (not shown) so that the centers thereof coincide.

On the outer periphery of the pair of meshing portions 14B, sprocket teeth of a standard tooth shape of a general sprocket for a silent chain for meshing with meshing teeth T of plates 2A, 2B arranged on both sides of the chain 1. t ′ are provided in the same phase on the left and right.

In the sprocket 14 of this embodiment, since the sprocket teeth t 'and the meshing teeth T on the outer periphery of the chain 1 mesh with each other in the same manner as the normal mesh between the silent chain and the sprocket, large power transmission can be performed. it can.

Further, at the time of meshing with the chain 1, the cylindrical outer peripheral surface R of the plate receiving portion 14A disposed between the meshing portions 14B abuts against the back surfaces S of the plates 2C and 2D to guide and support them. At the same time, auxiliary power transmission is performed between the chain 1 and the sprocket 14 by the frictional force acting between the rear surface and the tooth tip.

The pair of meshing portions 14B of the sprocket 14 are made of a metal material such as steel, and the plate receiving portion 1
4A may be formed of a resin material. In this case, plates 2C and 2D generated at the time of engagement with sprocket 14 are formed.
The collision between the plate and the cylindrical outer peripheral surface R of the plate receiving portion 14A is buffered by using the resin material, so that noise generated at the time of meshing can be reduced.

When a metal material is used for the plate receiving portion 14A, it can be manufactured as a single component integral with the meshing portion 14B by using a method of molding and sintering metal powder. .

Next, FIG. 9 is a partial sectional view showing a fourth embodiment of a sprocket of a double mesh type silent chain according to the present invention.
4 and 4 only in the structure of the plate receiving part.

That is, the sprocket 24 shown in FIG.
The plate receiving portion 24A is assembled from a steel cylindrical base portion 24C and a rubber elastic ring 24D fitted on the outer peripheral surface thereof, and the cylindrical outer peripheral surface R abuts on the rear surface S of the plates 2C and 2D. Is the outer peripheral surface of the elastic ring 24D.

The pair of meshing portions 24B arranged on both sides of the plate receiving portion 24A have the same shape as the above-described meshing portion 14B of the sprocket 14.

In the sprocket 24 of the present embodiment, the back surface S of the plates 2C and 2D abuts against the cylindrical outer peripheral surface R formed by the outer peripheral surface of the elastic ring 24D when the sprocket 24 meshes with the chain 1. Large buffering and sound absorbing effects,
The vibration of the chain 1 can be suppressed, and a large noise reduction effect can be obtained.

Further, since the friction between the rear surface S of the plates 2C and 2D and the cylindrical outer peripheral surface R formed on the elastic ring 24D is large, the auxiliary force between the rear surface S and the cylindrical outer peripheral surface R is increased. The transmitted torque can be increased, and a pair of meshing portions 24B and the plate 2 between the chain 1 and the sprocket 24 are provided.
A large torque can be transmitted together with the transmission torque due to the engagement between A and 2B.

In order to reduce the number of parts and the number of assembling steps, one of the pair of meshing portions 24B and the cylindrical base portion 24C are formed integrally with the sprocket 24, and only the other meshing portion 24 is formed. Can also be produced independently.

FIG. 10 is a partial view showing a fifth embodiment of the sprocket of the double mesh type silent chain according to the present invention. The sprocket of the third embodiment shown in FIGS. 7 and 8 is shown. This is a further improved meshing characteristic of the sprocket 14, and the structure itself is the same as that of the sprocket 14.

In the sprocket 14 'shown in FIG. 10, when the plate receiving portion 14'A is in contact with the plate back surface S, the sprocket teeth t of the meshing portion 14'B are radially outward from the meshing pitch circle P. The outer diameter of the cylindrical outer peripheral surface R of the plate receiving portion 14'A is set slightly larger than that of the plate receiving portion 14A of the sprocket 14 so as to mesh with the meshing teeth T of the plates 2A and 2B at the shifted position. ing. In addition, the tooth profile itself of the sprocket tooth t is formed in a standard tooth profile.

According to the above configuration, as shown in the figure, when the chain 1 enters the sprocket 14 ', the cylindrical outer peripheral surface R of the plate receiving portion 14'A pushes up the rear surface S of the plate to radially outward. The chain 1
Most of the load acting on the sprocket 14 ′ in the radial direction from the side is received by the cylindrical outer peripheral surface R in contact with the plate back surface S.

As a result, the sprocket teeth t and the plate 2
The load on the meshing teeth T of A and 2B is reduced,
The force acting between the sprocket teeth t and the meshing teeth T of the plates 2A, 2B is effectively used for transmitting power.

Accordingly, wear of the sprocket teeth t and the meshing teeth T is reduced, and the durability of the chain 1 and the sprocket 14 'can be improved.

On the other hand, FIG. 11 shows that the outer diameter of the cylindrical outer peripheral surface R 'of the plate receiving portion 14'A of the sprocket 14' is
0 shows a case in which the chain 1 is smaller than the cylindrical outer peripheral surface R and is separated from the plate back surface S of the chain 1. In this case, when the chain 1 enters the sprocket 14 ', it acts on the chain 1. Plate 2 depending on the tension
The tooth surfaces of the meshing teeth T of A and 2B are meshed in a wedge shape between the tooth surfaces of the sprocket teeth t, and a large stress is generated on both the tooth surfaces of the meshing teeth T and the sprocket teeth t. The tooth T and the sprocket tooth t may be worn out at an early stage or cause a large operating noise.

Accordingly, especially on the outer peripheral side of the chain 1, the number of meshing teeth T simultaneously meshing with the sprocket teeth t is small, so that the load on the meshing teeth T and the sprocket teeth t is reduced, as shown in FIG. Like sprocket 14 '
When the chain 1 enters the plate receiving portion 14'A
The cylindrical outer peripheral surface R pushes up the plate back surface S to move the meshing position between the meshing tooth T and the sprocket tooth t to the pitch circle P.
It is desirable to bias more radially outward.

Next, FIG. 12 is a side view showing a sixth embodiment of a sprocket for a double sided silent chain according to the present invention.

FIGS. 13A and 13B are partial cross-sectional views of the sprocket shown in FIGS. 12A and 12B. FIG. 13A shows the position of the XX line in FIG. 12, FIG. 13B shows the position of the YY line, and FIG. The sprocket 34 shown in these figures shows a cross section at a line position. The sprocket 34 shown in these figures is configured by integrally connecting a pair of meshing portions 34B to both sides of a buffer ring receiving portion 34A having a cylindrical outer peripheral surface F. ing.

The pair of meshing portions 34B are provided concentrically with the buffer ring receiving portion 34A, and have a plate 2A,
Sprocket teeth t meshing with the meshing teeth T of 2B are formed.

The outer peripheral surface F of the buffer ring receiving portion 34A is formed to have a slightly smaller diameter than the root circle of the sprocket teeth t formed on the outer periphery of the pair of meshing portions 34, respectively.
A buffer ring 34C is mounted on the outside so as to be free to float.

As shown in FIG. 12, the buffer ring 34
In the state where the outer circumference of the chain 1 is stretched over the sprocket 34, the outer circumference of the chain 1 is pushed by the flat plate back surface S of the chain 1 and the center thereof is
12, the inner peripheral surface is maintained in a state of being in line contact with the outer peripheral surface of the buffer ring receiving portion 34A near the line ZZ in FIG.

When the chain 1 enters the sprocket 34, the chain 1 is moved to the position shown in FIG.
As shown in the figure, before the meshing teeth T of the left and right plates 2A and 2B mesh with the sprocket teeth t on the outer circumference of the pair of meshing portions 34B, the outer peripheral surface of the buffer ring 34C is
C and 2D are in contact with the flat back surface S.

At this time, as described above, the buffer ring 34C is in line contact with only one location on the outer peripheral surface of the buffer ring receiving portion 34A. Floating around, absorb the impact energy of the collision and mitigate the impact.

Further, at the position of line YY in FIG.
As shown in (b), the outer peripheral surface of the buffer ring 34C is separated from the back surface S of the plates 2C, 2D, and instead, the meshing teeth T formed on the plates 2A, 2B on both sides of the chain 1 are sprockets. 34 engagement portion 34B
And is supported by meshing with the sprocket teeth t formed on the surface.

Further, after passing through the position ZZ in FIG. 12, the outer peripheral surface of the buffer ring 34C again comes into contact with the back surface S of the plate, and the chain 1 is pushed outward in the radial direction of the sprocket 34, and the meshing teeth are formed. T is disengaged from sprocket tooth t.

During this time, the buffer ring 34C winds the lubricating oil supplied from the outside while rotating with the sprocket 34, and feeds the lubricating oil between the meshing teeth T and the sprocket teeth t of the chain 1.

Although a metal material such as steel is used for the buffer ring 34C due to its strength, a rubber or resin material coating layer may be formed on the surface in order to enhance the buffer effect and reduce the operation noise. If there is no problem in strength, the buffer ring 34C itself may be made of a nonmetallic material such as rubber or resin material.

Next, FIG. 14 is a side view showing a seventh embodiment of a sprocket for a double-ended mesh type silent chain according to the present invention, and FIG. 15 is a view taken in the direction of the arrow at the position of line DD in FIG. FIG. 2 is a cross-sectional view, in which a sprocket 44 of this embodiment is used by meshing with the inner peripheral side of the chain 1 described above.

The sprocket 44 has a meshing portion 44A formed on the outer periphery with a sprocket tooth t meshing with the meshing tooth T facing the inner circumferential side of the chain 1, and a cylindrical member provided concentrically on both left and right sides thereof. It is composed of a pair of plate receiving portions 44B having an outer peripheral surface R.

The diameter of the cylindrical outer peripheral surface R of these plate receiving portions 44B is formed slightly smaller than the tip diameter of the sprocket teeth t, and the meshing teeth T of the chain 1 mesh with the sprocket teeth t. At this time, the chain 1 abuts against the flat back surface S of the outer plates 2A and 2B of each row, supports the radial load applied from the chain 1, and
The vibration of the chain 1 is suppressed.

When the respective cylindrical outer peripheral surfaces R of the pair of plate receiving portions 44B are in contact with the back surface S of the plates 2A and 2B, the sprocket teeth t are radially outside the mesh pitch circle. It is desirable that the diameter is set so as to mesh with the meshing teeth T of the plates 2C and 2D.

In this case, the chain 1 is attached to the sprocket teeth t.
Before the meshing teeth T mesh with each other, the cylindrical outer peripheral surface R of the plate receiving portion 44B pushes up the rear surface S of the plates 2A and 2B to be shifted radially outward, so that the sprocket teeth t are outside the meshing pitch circle. As a result, the load in the radial direction of the sprocket 44 acting between the meshing teeth T of the chain 1 and the sprocket teeth t is greatly reduced.

In the present embodiment, the meshing portion 44A and the pair of plate receiving portions 44B are integrally formed from a single material, but may be assembled separately after being manufactured separately.

FIG. 16 is a sectional view showing an eighth embodiment of a sprocket for a double-ended mesh silent chain according to the present invention. The sprocket 54 of this embodiment also engages the inner peripheral side of the chain 1 described above. Are used together.
The sprocket teeth t meshing with the meshing teeth T formed on the plates 2C and 2D of the chain 1 are provided concentrically on the left and right sides of a meshing portion 54A formed on the outer periphery.
And a pair of buffer ring receiving portions 54B each having a cylindrical outer peripheral surface F.

A buffer ring 54C having an inner diameter larger than these outer diameters is mounted on the outer periphery of each buffer ring receiving portion 54B so as to float freely, and is fixed to the end surfaces of the buffer ring receiving portions 54B on both sides. Retaining flange 5
The movement of the sprocket 54 in the axial direction is restricted between the 4D and the engagement portion 54A.

In the sprocket 54 of this embodiment, a pair of cushioning rings 54C mounted on both sides of the meshing portion 54A are combined with the sprocket 3 of the sixth embodiment.
4 (see FIG. 12 and FIG. 13), and functions to cushion collision between the tooth surfaces when the meshing teeth T on the inner peripheral side of the chain 1 mesh with the sprocket teeth t.

In this embodiment, the retaining flanges 54D are fixed to both end surfaces of the buffer ring receiving portion 54B in order to prevent the buffer ring 54C from dropping from the buffer ring receiving portion 54B. Instead of providing these retaining flanges 54D on the sprocket 54, the sprocket 54 may be fixed to the rotating shaft J to which the sprocket 54 is attached.

[0096]

As described above, according to the double-ended mesh type silent chain of the first aspect, since the side faces of the plates are all the same, it can be manufactured by one plate type. Compared with a conventional chain of this type knitted by plates of various types, the number of man-hours for managing parts can be reduced and erroneous assembly can be prevented, so that productivity can be dramatically improved.

Further, since a heavy guide plate without meshing teeth as used in a conventional silent chain is not used, the entire chain can be reduced in weight.

Furthermore, since the meshing teeth facing the outer circumference of the chain have the same shape as the meshing teeth facing the inner circumference, the torque that can be transmitted to the sprocket arranged on the outer circumference of the chain is increased. be able to. The plates arranged on both sides of the odd-numbered rows, the plates arranged on both sides of the even-numbered rows, and the plates arranged on the inside of the even-numbered rows have the same thickness. Since the plates arranged inside the odd-numbered rows are thinner than these, the power transmission is performed by equalizing the tensile strength of each row.

According to the double-ended mesh type silent chain of the present invention, the back surface of the plate on the outer peripheral side of the chain is brought into sliding contact with the shoe surface of the chain guide and the tensioner lever, and from both sides of the back surface of these plates. The inner surfaces of the protruding meshing teeth can be guided by both side surfaces of the shoe surface such as a chain guide.

According to the sprocket for a double-side mesh silent chain according to the third aspect, since the tip end portions of the sprocket teeth formed on the ready-made standard sprocket can be machined to easily form the plate supporting surface. It can be manufactured at low cost, and can be used in combination with the double-side mesh silent chain according to the first or second aspect.

Further, since the plate supporting surface formed on the sprocket teeth also serves as a chain guide for guiding and supporting the rear surface of the plate at the central portion in the width direction of the chain, the runout of the chain during traveling is suppressed. In addition, the plate supporting surface receives the reaction force of the chain and shares the load applied to the meshing teeth of the sprocket, so that the durability can be improved.

According to the sprocket for a double-sided mesh type silent chain according to the fourth aspect, the sprocket teeth on the outer periphery of the pair of meshing portions can be formed in a standard tooth shape, and the meshing on the inner circumferential side of a normal silent chain. A reliable meshing state similar to the meshing between the teeth and the sprocket teeth of the standard tooth profile is realized between the meshing teeth on the outer peripheral side of the double-engaged silent chain according to claim 1 or 2. Therefore, high torque can be transmitted.

Moreover, since the outer peripheral surface of the plate receiving portion is formed of a cylindrical surface, the back surface of the plate can be smoothly guided and supported, and the function as a chain guide is further enhanced as compared with the third embodiment. In addition, since the outer peripheral surface of the plate receiving portion receives the tension of the chain and reduces the load on both the meshing teeth and the sprocket teeth of the chain, the durability of both the chain and the sprocket can be increased.

According to the sprocket for a double-sided silent chain according to the fifth aspect, when the sprocket teeth formed on the outer periphery of the meshing portion mesh with the meshing teeth on the inner circumferential side of the chain to transmit power. Since a pair of plate receiving portions having a cylindrical outer peripheral surface on both sides of the meshing portion smoothly guide and support the flat plate rear surface and serve as a chain guide, vibration caused by polygonal motion of the chain is suppressed. As a result, the running state can be stabilized, and the operating noise can be reduced.

According to the sprocket for a double-side mesh silent chain according to the sixth aspect, on the outer peripheral side or the inner peripheral side of the chain, immediately before the meshing teeth of the chain mesh with the sprocket teeth, the cylindrical shape of the plate receiving portion is formed. Since the outer peripheral surface acts to push up the rear surface of the plate and positively bias it radially outward, most of the load acting in the radial direction of the sprocket from the chain side is supported by the cylindrical outer peripheral surface abutting the rear surface of the plate. In addition, the load on the sprocket teeth and the meshing teeth of the chain can be significantly reduced, and the sprocket teeth and the meshing teeth can be reduced in wear, so that the durability of the sprocket can be improved and the transmission efficiency can be increased.

According to the sprocket for a double-side mesh silent chain according to the seventh aspect, before the meshing teeth of the chain mesh with the sprocket teeth on the outer circumferential side of the chain, the outer periphery of the buffer ring mounted on the buffer ring receiving portion. Since the surface abuts against the flat plate back of the chain, the runout due to the polygonal movement of the chain when passing through the sprocket is suppressed, and the collision at the time of engagement between the sprocket teeth and the meshing teeth of the chain is buffered, It is possible to reduce meshing noise during chain running.

Also, as the sprocket rotates, the shock-absorbing ring swings around the shock-absorbing ring receiving portion while rotating, so that the collision position between the meshing teeth of the chain and the sprocket teeth fluctuates randomly. However, uneven wear of these tooth surfaces can be prevented.

Further, the cushioning ring absorbs and absorbs the collision energy between the meshing teeth of the chain and the sprocket teeth, and lubricating oil supplied from the outside is guided between the sprocket teeth and the meshing teeth of the chain. For,
Wear and fatigue of meshing teeth and sprocket teeth of the chain are suppressed, and wear elongation of the chain can be reduced.

According to the sprocket for double-sided engagement type silent chain according to the eighth aspect, the same effect as the effect of the invention described in the seventh aspect can be obtained also in the sprocket engaged on the inner peripheral side of the chain.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a double-side mesh silent chain according to the present invention.

FIG. 2 is a plan view showing an embodiment of a double-side mesh silent chain according to the present invention.

FIG. 3 is a side view showing a first embodiment of a sprocket of a double-side mesh silent chain according to the present invention.

FIG. 4 is a partial cross-sectional view taken along the line AA in FIG.

FIG. 5 is a side view showing a second embodiment of the sprocket of the double mesh type silent chain of the present invention.

FIG. 6 is a partial cross-sectional view taken along a line BB in FIG.

FIG. 7 is a side view showing a third embodiment of a sprocket of the double mesh type silent chain according to the present invention.

FIG. 8 is a partial cross-sectional view taken along the line CC in FIG.

FIG. 9 is a partial cross-sectional view showing a fourth embodiment of a sprocket of a double mesh type silent chain according to the present invention.

FIG. 10 is a partial side view showing a meshing state between a chain and a sprocket in a fifth embodiment of a sprocket for a double-ended mesh silent chain according to the present invention.

FIG. 11 is a partial side view showing the meshing state of the chain and the sprocket when the outer peripheral surface of the plate receiving portion is separated from the back surface of the plate of the double-side meshing silent chain.

FIG. 12 is a side view showing a sixth embodiment of a sprocket for a double-sided silent chain of the present invention.

13 is a partial sectional view of the sprocket shown in FIG. 12, (a) is a sectional view taken along the line XX in FIG. 12, (b) is a sectional view taken along the YY line, and (c) is a sectional view taken along the ZZ line position. Are respectively shown.

FIG. 14 is a side view showing a seventh embodiment of a sprocket for a double-ended mesh silent chain according to the present invention.

FIG. 15 is a partial cross-sectional view taken in the direction of the arrow at the position of line DD in FIG. 14;

FIG. 16 is a sectional view showing an eighth embodiment of a sprocket for a double-ended mesh type silent chain according to the present invention.

FIG. 17 is a view showing an example of a conventional double-sided silent chain.

FIG. 18 is a view showing a plate configuration of the double-side mesh silent chain shown in FIG. 17;

[Explanation of symbols]

Reference Signs List 1 chain (double-sided silent chain) 2A, 2B, 2C, 2D plate 3 pin 4, 4 ', 14, 14', 24, 34, 44, 54
Sprocket 14A, 14'A, 24A, 44B Plate receiving part 14B, 14'B, 24B, 34B, 44A, 54A
Meshing portion 24C Cylindrical base portion 24D Elastic ring 34A, 54B Buffer ring receiving portion 34C, 54C Buffer ring 54D Retaining flange J Rotating shaft K, K 'Plate supporting surface R, R' Cylindrical outer peripheral surface S Back surface T t, t 'sprocket teeth

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Riki Haginoya 4-17-96 Tsurumi, Tsurumi-ku, Osaka-shi, Osaka Inside Tsubakimoto Chain Co., Ltd. (56) References JP-A-11-166600 (JP, A) JP-A-11-166600 JP-A-10-259857 (JP, A) JP-A-11-125326 (JP, A) JP-A-8-219236 (JP, A) JP-A-59-195238 (JP, U) JP-B-49-2819 (JP, A) , B1) US Patent 4,999,543 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16G 13/02-13/10 F16H 51/00-55/30 F16H 7/00-7 / twenty four

Claims (8)

(57) [Claims] 1. A plate having a pair of meshing teeth and having a flat back surface formed on the opposite side of the meshing teeth and having the same side shape is used, and these plates have an odd number in the chain width direction. The aligned rows and the even rows are connected with adjacent plates by pins, and are alternately arranged in the longitudinal direction of the chain, and the plates arranged on both outer sides of each row have meshing teeth on the outer peripheral side of the chain. And the remaining plates are knitted double-sided silent chains in which the meshing teeth are all directed toward the inner circumferential side of the chain, and the plates arranged on both outer sides of the odd-numbered rows and the even-numbered Plates arranged on both outer sides of the aligned rows and plates arranged on the inner side of the even-numbered rows,
A double-sided silent chain, wherein plates of the same thickness are used, and the plates disposed inside the odd-numbered rows are thinner than these plates. 2. The double-sided interlocking silent chain according to claim 1, wherein the intermeshing teeth of each plate protrude from the back surface of the opposing plate in the same row. 3. The sprocket teeth meshing with the meshing teeth of the plate whose meshing teeth face the chain outer circumferential side are formed on the outer circumference, and the sprocket teeth support a flat plate rear face facing the chain outer circumferential side. A sprocket for a double-side mesh silent chain, wherein a plate supporting surface is formed. 4. A plate receiving portion having a cylindrical outer peripheral surface abutting on a flat plate rear surface facing the chain outer peripheral side, provided concentrically on both left and right sides of the plate receiving portion, and respectively meshing with the chain outer peripheral side. A sprocket for a double-side mesh silent chain, comprising: a pair of meshing portions formed on an outer periphery with sprocket teeth meshing with meshing teeth of a plate whose teeth face. 5. A sprocket tooth meshing with a meshing tooth of a plate having a meshing tooth facing the inner circumferential side of the chain, and a meshing portion formed on the outer periphery, and concentrically provided on both left and right sides of the meshing portion. A pair of plate receiving portions each having a cylindrical outer peripheral surface abutting a flat plate rear surface facing the inner peripheral side of the chain. 6. A sprocket tooth meshes with a meshing tooth of an opposing plate radially outside the meshing pitch circle when the outer peripheral surface of the plate receiving portion contacts the flat plate rear surface. 6. The sprocket for a double-side mesh silent chain according to claim 4 or 5, wherein 7. A pair of left and right meshing portions formed on the outer periphery with sprocket teeth respectively meshing with meshing teeth of a plate whose meshing teeth face the chain outer peripheral side, and a pair of cylindrical outer peripheral surfaces. A shock-absorbing ring receiving portion for connecting the meshing portions concentrically and integrally; and a shock-absorbing ring receiver floatingly mounted on the outer periphery of the shock-absorbing portion with the axial movement restricted between the meshing portions on both sides. A buffer ring having an inner diameter larger than the outer diameter of the portion, wherein the buffer ring abuts against a flat plate rear surface whose outer peripheral surface faces before and after the position where the meshing teeth of the plate mesh with the sprocket teeth, and Wherein the outer peripheral surface is separated from the plate back surface and the inner peripheral surface is configured to abut against the outer peripheral surface of the buffer ring receiving portion at a position where the sprocket teeth mesh with the sprocket teeth. sprocket. 8. A meshing portion formed on the outer periphery with sprocket teeth meshing with meshing teeth of a plate whose meshing teeth face the inner circumferential side of the chain, each having a cylindrical outer peripheral surface, and A pair of buffer ring receiving portions provided concentrically on both the left and right sides, and each of the buffer ring receiving portions is mounted on the outer periphery of these buffer ring receiving portions in a freely floating manner in a state where the movement in the axial direction is regulated with respect to the buffer ring receiving portions. A pair of buffer rings having an inner diameter larger than the outer diameter of the buffer ring receiving portion, each of which is provided on the back of a flat plate whose outer peripheral surface faces before and after the position where the meshing teeth of the plate mesh with the sprocket teeth. At the position where the meshing teeth and the sprocket teeth mesh with each other, the outer peripheral surfaces of the meshing teeth and the sprocket teeth are separated from the plate rear surface, and the inner peripheral surface is configured to contact the outer peripheral surface of the buffer ring receiving portion. Sprocket for silent chain with double mesh.