JPH0276944A - Power transmission - Google Patents

Abstract

PURPOSE:To reduce the chord vibration as a whole of a multiple chain in which a plurality of chains having the same pitch are arranged in parallel to each other, when the chain is engaged with a sprocket and transmit power quietly by engaging and retaining each of the chains with these chains displaced in the longitudinal direction. CONSTITUTION:Each of two roller chains 2A and 2B consists of an internal link 11, an external link 12, a pin 13, a bush 14 and a roller 15. Some pins 13 project from other pins and the projection pin 16 is engaged with the internal link 11 of the other chain 2B. Since the chain 2B has the links displaced by 1/2 pitch in the longitudinal direction from the links of the chain 2A, the engaging timing with a sprocket is differed for each chain so that the chord vibration generated when the individual chains may be engaged with the sprockets interferes each other and controlled. So compared with a single chain, the noise caused by the chord vibration may be reduced and power be transmitted quietly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power transmission device that transmits power by winding a chain around a sprocket or a V-shaped pulley.

(Prior art) Even though they are called power transmission chains, there are many types and diversification, but there are roller chains that are wrapped around sprockets, silent chains that are wrapped around toothed pulleys, and chains that are wrapped around V-shaped pulleys. The main types are chain-type V-belts and the like. By the way, these power transmission chains (hereinafter referred to as chains) are endless continuous bodies, but they are multi-section bodies and are composed of links of a certain size connected by pins, and unlike rubber belts, they are There is. Therefore, at the moment when the chain wraps around the sprocket, a radial velocity component is generated in addition to the circumferential velocity component, and the radial velocity hits the sprocket and becomes an impact force, and the impact force is the cause of noise. Not only that, but the life of the chain is greatly reduced. This phenomenon also occurs when a chain-type V-belt wraps around a type pulley. FIG. 10 is a schematic diagram of the case where the chain 2 is wound around the V-shaped pulley 1, and the chain 2 is
Existing in position, ■ Solo Nku is 8 +, AR, A
:l, A4..., and shows the state at the moment when block A3 or V-shaped pulley 1 is caught. ■At the moment when block A or V-shaped pulley 1 is engaged, the front V block A is Y-Y passing through the center of V-shaped pulley 1.
exists in a symmetrical position with respect to the axis, and then the Y-Y axis is Af
f, rotate counterclockwise without losing the relative positional relationship with A4. Therefore, (2) Block A moves along radius r and moves to position B3, and if it rotates further, it moves to position A4. In this case, if you move to V block A or B, the unwrapped chain 2 will rise from A to B by a distance IIIH, and if you move from position B to A4, chain 2 will rise from B again. Descend to A.

Therefore, V block A1 is Bl"At→B2→Af
A moves up and down to f, and does not always run in a straight line, and this phenomenon results in string vibration of the chain 2, which meshes with the V-shaped brewer l.

In this case, impact force and noise are generated.

Such string vibration occurs not only in chain-type V-belts but also in -119 roller chains and silent chains, and is an unavoidable phenomenon for chains that are multi-jointed.

(Objective of the present invention) When transmitting power by winding a chain around a V-shaped pulley or sprocket, the above-mentioned problems occur. However, it is theoretically difficult to completely eliminate the above phenomenon, so the present invention provides a power transmission device that can perform quiet power transmission by suppressing this phenomenon as much as possible.

(Structure of the present invention) In order to solve the above-mentioned problems, the chain according to the present invention is structured with the following features. That is, since it is impossible to completely eliminate the string vibrations of a chain made up of multi-section bodies, it is necessary to suppress the string vibrations as much as possible to suppress the generation of noise. As is clear from Fig. 10, the most elementary means of suppressing string vibration is to reduce the pitch length of the chain; or, as the chain pitch becomes smaller, the chain strength decreases accordingly. Large power transmission becomes impossible. Therefore, reducing the chain pitch is not a practical means.

However, the present invention does not shorten the chain pitch.
This may be a multi-row chain in which a plurality of chains with the same pitch length are arranged in parallel with each other, or each chain is engaged and fixed in a state where the chains are shifted in the longitudinal direction. Of course, the number of chains arranged in parallel here is not limited, and the engaging/fastening means may also be arbitrary. The V-shaped pulley around which such a chain is wound may be one that corresponds to the width of the chain, or if it is a sprocket or a pulley with teeth, the phase of each sprocket tooth may be adjusted to compensate for the longitudinal positional deviation. It is combined by zooming.

(Function) In this way, chains with the same pitch are arranged in parallel and fixed so that they do not separate during operation, so that they can be attached to the sprocket or
By winding the chain around a type pulley, there will be a difference in the time each chain meshes with the sprocket. That is, in FIG. 10, the chain at position A moves to position B by advancing in pitch, so if two chains with shifted pitches are combined in parallel, the chain at position A will move to position B between A and B. will be located.

Figure 1 shows the position of the V solenoid in the chain 2 when the two chains 2A, 2a are combined and wrapped around the V-shaped pulley 1.
Block A is not in the position shown in FIG. 10, but is lifted by chain 2B and is located above. Conversely, V block B of chain 2a.

is pulled down by the chain 2A, and each V block is located at the position where the forces acting between the chains 2A and 28 are balanced, so the string vibration of the chain as a whole is reduced, resulting in a quiet Power transmission can be performed.

Although FIG. 1 shows a case where two chains 2A, 2a are combined in parallel, the present invention does not limit the number of chains combined.

Embodiments of the present invention will be described in detail below with reference to the drawings.

(Embodiment) FIGS. 2 and 3 show embodiments of the power transmission chain according to the present invention, in which two roller chains 2A and 211 are fixed in parallel. The roller chains 2A, 28 themselves are only ones that have been used conventionally, and the inner link 1
1, outer link 12, pin 13, bush 14 and roller 1
5, the pins 13 protrude from other pins in some places, and the protruding pins 16 engage with inner links 11 of other chains 2B. Here, engagement refers to a state in which displacement in the longitudinal direction is prevented and slight displacement in the vertical direction is allowed.By the way, the chains 2A and 2B are roller chains with the same pitch P. Each chain 2A, 2a is equipped with a roller 15 for wrapping around a sprocket, with the pin 13 and bush 14 as axes.

Since the chains 2B and 2A are engaged with each other at positions shifted in the longitudinal direction by % pitch, the rollers 15a
are located between both rollers 15A, 15 of the chain 2A. Of course, here both chains 2
A. The means for fixing 2a so as not to separate is arbitrary, and the pin 13 is made to protrude and a flange is formed at the tip, and the flange is used to prevent separation. However, this method is just one example; when engaged by the protruding pin 16, or when other methods are used, the engaged state is different from both chains 2.
A, 211 does not need to separate, and slight longitudinal movement and bending are allowed. Furthermore, the term "roller chain" shall be interpreted to include a bush chain without rollers.

Figures 4 and 5 show examples in which two silent chains 2c and 2o having the same shape are fastened in parallel.

The silent chain 2c, 2° has a plurality of links 17.
．． 17... are arranged and connected in a flexible manner with pins 18, and the basic structure is no different from the conventional one, as guide links are not combined with both sites. Then, attach the pin 18 of the silent chain 2C so that both silent chains 2C12° do not separate from each other.
o is extended and engaged with the link 17c of the silent chain 2c. In addition, both silent chains 2c, 2
In order to make the distance between A and A constant, a bush 19 of a certain length is interposed to fix the connection, and in this case, the engaged and fixed state is the same as in the roller chain embodiment described above, so that it is fixed so that it does not separate. As long as the pins are attached, bending is allowed, and furthermore, split bottles that roll into contact with each other may be used as the pins 18 instead.

On the other hand, FIGS. 6 and 7 show specific examples of chain type V-belts, in which both chains 2E and 2r are combined with each other in parallel. The chains 2E, zr have an outer link 20, an inner link 21, and a connecting link 22, which are connected to each other with a pin 23 so as to be flexible.
A protrusion 23 is formed in the outer circumferential direction, a hole is provided in the protrusion 23, and a V block 24 is fitted into the chain hole. Applicable V
Both end surfaces of the block 24 have a shape suitable for contacting the inclined surface of the V-shaped pulley, and the V block 24 extends largely toward the chain 2r side, while the V° block 24F extends largely toward the chain 27 side. With both chains 2E and 2r in parallel and fixed, each V block 24
The length is such that both end faces of g and 24r can coincide with each other. Further, the fastening method is such that the pin 23 of the chain 22 protrudes in the direction of the chain 2°, and the protruding pin 25 is engaged with an intermediate position of the inner link 21 of the chain 2t. Further, in the case of this embodiment as well, both chains zffi and zr are fixed to each other with a bush 26 interposed in order to make the distance between both chains 2e and 2r constant when they are engaged. Moreover, the position of each V block 24 is shifted by a number of pitches. Of course, the V blocks 24, 24, etc. may be arranged at equal intervals by shifting the pitch.In the above embodiment, there are two chains paralleled, and one chain should be shifted by the pitch. The number of chains that are engaged at a position or combined is arbitrary, and may be three or four.

Incidentally, FIGS. 8 and 9 show a sprocket 3 around which the chain 2 according to the present invention is wound, and teeth 27 are formed on the outer periphery of the sprocket 3. @
27 is formed all around the circumference with a constant pitch corresponding to the pitch of the chain, and has both teeth 27a,
The teeth 27b are arranged in parallel at regular intervals, and the teeth 27b protrude from the teeth 27a with a different pitch, and both the chains zA and 2B are wound around them. Of course, in the case of the silent chains 2c and 2n, the toothed pulley to which the chain is wound has two rows of protruding teeth as in FIGS. 8 and 9, and the teeth in each row are shifted by the noise pitch. It is formed. However, since the chain 2 formed by combining the chains 2E and 2F is wound around the V-shaped pulley 1, a slightly wider V-shaped pulley 1 may be used.

By the way, the chain 2 of the present invention is a chain composed of a plurality of chains combined in parallel, or the combination of each chain is incorrect, as in the above embodiment, by engaging the protruding pins with other chain links.・Not limited to cases where it sticks. For example, it is quite possible to restrain it with a spring band so as not to cause displacement in the longitudinal direction.

As described above, the power transmission device according to the present invention arranges a plurality of chains in parallel with each other, combines them so that they do not separate from each other, and also staggers the pitch of each chain and combines them to form a predetermined sprocket or V-type sprocket. By wrapping it around a pulley, you can achieve the following effects.

(Effects) (1) In this way, by combining multiple chains in parallel and engaging and fixing them at different pitches, the timing at which each chain bites into a sprocket or V-shaped pulley differs depending on each chain. It is possible to suppress the string vibrations that occur when each chain or sprocket engages with each other by interfering with each other. Therefore, compared to a single chain, the noise caused by the string vibration is lower, allowing quiet power transmission.

(2) Furthermore, since the above-mentioned string vibration is suppressed to a small level, the impact force hitting the sprocket and the chain tension are also reduced, and the durability of the chain itself is greatly improved.

[Brief explanation of the drawing]

Fig. 1 shows the movement of the V block when the chain according to the present invention is wound around a V-shaped pulley, and Figs. 2 and 3 show specific examples of a roller chain. The figure shows a front view, FIGS. 4 and 5 show a specific example of a silent chain, FIGS. 6 and 7 show a specific example of a chain-type V-belt, and FIGS. 4 and 6 show a plan view. , Figures 5 and 7 show front views, Figures 8 and 9 show sprocket implementation, Figure 8 is a front view, Figure 9 is a sectional view, and Figure 10 is a conventional sprocket. Each figure shows the movement of the chain as it wraps around the V-shaped pulley. 1...V-type pulley, 2...chain, 3...sprocket, 11.21...inner link, 12, 20
...Outer link, 13,181...Pin, 14, 19
．． 26... Bush, 15... Roller, 16.25
... Projection bottle, 17. Link, 22. Connecting link, 23. Projection, 24. V block.

Claims (3)

[Claims] (1) A plurality of roller chains of the same size are arranged and combined in parallel with each other, and each roller chain is engaged with a fixed length shift in the longitudinal direction, and protrudes with a pitch shift corresponding to the above position shift. A power transmission device characterized by being wound around a sprocket having formed teeth. (2) A plurality of silent chains of the same size are arranged and combined in parallel with each other, and each silent chain is engaged with a fixed length offset in the longitudinal direction, and protrudes with a pitch shift corresponding to the above positional shift. A power transmission device characterized in that the power transmission device is wound around a toothed pulley having formed teeth. (3) Multiple chain-type V-belts of the same size are arranged and combined in parallel with each other, and each chain-type V-belt is engaged with a fixed length offset in the longitudinal direction, and is wound around a V-shaped pulley. A power transmission device characterized by: