JPH0483942A - Transmission chain - Google Patents

Abstract

PURPOSE:To reduce noise under power transmission greatly by providing a number of transmission blocks having different heights from the inside edge of each block to the inside edge of a chain inserting window, and arranging these blocks in irregular detentions in the longitudinal direction of the chain. CONSTITUTION:Each of three types of blocks 7, 8, 9 has an inverted trapezoidal form, and their contour and dimensions are made identical. That is. the inclination angles of the side slopes of these transmission blocks 7-9 shall be identical so as to respond to the V-groove shape of a V-pulley on which a transmission chain 6 is set over, and also the widths of the chain inside edges 7b, 8b, 9b of these blocks 7-9 shall be the same being a specified reference dimension. The heights H from the inside edges 7b, 8b, 9b to the inside edges 7c, 8c, 9c of chain inserting windows 7a, 8a, 9a are different - i.e., H0 for the block 7, H1 for the block 8, and H2 for the block 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a transmission chain for a continuously variable transmission in which a large number of transmission blocks each having a chain insertion window are engaged with each other in the longitudinal direction of the chain.

2. Description of the Related Art Conventional continuously variable transmission transmission chains are known, for example, from Japanese Patent Application Laid-open No. 59
There is a chain insertion window 1 with two rows as shown in FIG.
A large number of transmission blocks 1 having numbers a and Ia are engaged with each other in the longitudinal direction of the chain to form an endless transmission chain 3.

As shown in FIG. 8, the transmission chain 3 is used by being passed around the input pulley 4 and the output pulley 5 in an endless manner, and in the state shown in FIG. 8(a), the transmission chain 3 and the output pulley Since the contact diameter between the transmission chain 3 and the input pulley 4 is larger than the contact diameter between the transmission chain 3 and the input pulley 4, the rotation of the input pulley 4 is decelerated and transmitted to the output pulley 5. Since the contact diameter between the transmission chain 3 and the output pulley 5 is smaller than the contact diameter between the transmission chain 3 and the input pulley 4, the rotation of the input pulley 4 is accelerated and the output pulley -U5
It is transmitted to

Here, as shown in FIG. 6, the chain 2 is composed of links 2a stacked in multiple layers and bendably connected by a connecting pin 2b, and has the function of supporting the tension applied to the transmission chain 3. ing.

The connecting pin 2b is also engaged with the transmission block 1, and the connecting pin 2b is connected to the output pulley via the link 2a using the power transmitted to the transmission block 1 by friction from the pulley 4 as tension. On the output pulley 5 side, the tension is transmitted as power to the transmission block 1 by engagement with the connecting pin, and the power is transmitted from the transmission block 1 to the output pulley by friction. is driven.

Then, V of pulleys 4 and 5 with respect to transmission block 1
When pressing the groove surface, if the load is increased, Boo! Since the frictional force between 74.5 and the transmission block 1 increases, the torque transmission capacity also increases.

Problems to be Solved by the Invention However, in the above-mentioned prior art, when the transmission chain 3 transmits power, the transmission block 1 bites into the pulley due to the tension of the chain 2.2 and meshes with it, thereby generating meshing noise. However, in the conventional power transmission chain 3, the pitch length of the chain, that is, the connecting pin 2
b is constant, and the width W of the inner peripheral edge 1b of the transmission block 1 and the height H from the inner peripheral edge 1b to the inner peripheral edge IC of the chain insertion windows 1a and la. Since all of the transmission blocks 1 are made to be the same among a large number of transmission blocks 1, the intervals between the meshing sounds are uniform, which causes a problem of generating extremely high-level noise at a certain frequency.

This invention suppresses the above-mentioned noise by gradually shifting the interval at which the meshing noise occurs.

Means for Solving the Problems The present invention provides a transmission chain for a continuously variable transmission in which a large number of transmission blocks each having a chain insertion window are engaged with each other in the longitudinal direction of the chain. The present invention is characterized in that a plurality of types of transmission blocks having different heights from to the inner circumferential edge of the chain insertion window are engaged and mounted irregularly in the longitudinal direction of the chain.

Assuming that the groove width of the pulley on which the transmission chain is hung is constant, the width of the inner peripheral edge of the transmission chain in the transmission block and from that inner peripheral edge to the inner peripheral edge of the chain insertion window. Next to a standard transmission block whose height is the predetermined standard dimension, if a transmission block whose height is lower than the standard dimension and whose width is the same is attached to the chain, then the standard transmission block is attached to the pulley. The angle at which the pulley rotates until the low-height transmission block engages with the pulley after it is engaged is determined by the fact that the standard transmission block is followed by another standard transmission block that is engaged with the chain, and they are sequentially attached to the pulley. It will be larger than when they interlock.

This is because the position of the inner circumferential side edge of the chain insertion window is close to the center of the pulley when the transmission block is meshed with the pulley, which is lower in height than the reference transmission block.
This is because the chain cannot press the transmission block against the pulley unless the pulley rotates that much more.

Therefore, when the low-height transmission block is placed next to the standard transmission block, the interval between meshing sounds will be longer than when two standard transmission blocks are placed adjacent to each other. .

Also, contrary to the above case, if a transmission block is attached to the chain next to the reference transmission block with the width unchanged and the height higher than the standard dimensions, the reference transmission block is attached to the pulley. After meshing, the pulley rotates until the high transmission block engages with the pulley.The standard transmission block is followed by another standard transmission block that is engaged with the chain, and they are sequentially connected to the pulley. It will be smaller than when it meshes with the

This is because the higher-height transmission block has fewer pulleys than the standard transmission block because the inner edge of the chain insertion window is farther away from the center of the pulley when engaged with the pulley. This is because the chain can press the transmission block against the pulley even when the chain rotates.

Therefore, when the high-height transmission block is placed next to the standard transmission block, the interval between meshing sounds will be shorter than when two standard transmission blocks are placed adjacent to each other. .

Also, when the low-height transmission block is fitted next to the reference transmission block, the two standards are The interval between meshing sounds becomes longer than when the transmission blocks are arranged adjacent to each other.

In view of the above points, the power transmission chain of this invention includes:
A large number of transmission blocks with different heights from the inner peripheral edge of the transmission block to the inner peripheral edge of the chain insertion window are arranged in an irregularly engaged manner in the longitudinal direction of the chain. Even if the pitch length of the transmission blocks is constant, the intervals between the meshing noises generated during power transmission will not be constant among a large number of power transmission blocks, and will deviate little by little.

As a result, the generated sounds will interfere with each other.

Therefore, according to the present invention, it is possible to effectively prevent the occurrence of extremely high level peak noise at a certain frequency,
Noise during power transmission can be significantly reduced.

Embodiments Below, embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 is a sectional view showing one embodiment of the power transmission chain of the present invention, and the power transmission chain 6 shown in the same figure is similar to that shown in FIG.
), (b), and (C), a large number of three types of transmission blocks 7.8.9 each having one chain insertion window 7a, 8a, and 9a are arranged irregularly in the chain longitudinal direction. The chain 10 is of a single-row chain type, and is constructed by fitting a row of chains 10 through the windows 7a, 8a, and 9a and fitting them between adjacent connecting bins lOb. Similar to the chain 2 shown in the figure, links 10a are stacked in multiple layers and are bendably connected by rocker-type connecting pins 10b. The chain 10 is inserted into the chain two at a time in such a manner that they can roll into contact with each other, thereby reducing the bending resistance of the chain 10.

Further, the three types of transmission blocks 7, 8, 9 each have a roughly inverted trapezoidal shape as shown in FIG. 2, and their outer contours and dimensions are the same.

That is, the inclination angles of the inclined surfaces on both sides of these transmission blocks 7 to 9 are made to be the same so as to correspond to the groove shape of the ■-shaped pulley on which the transmission chain 6 is passed. Chain inner circumference edge 7 of νri 7 to 9
The widths W of b, 8b, and 9b are also the same predetermined reference dimension.

The height H from the inner peripheral edges 7b, 8b, 9b to the inner peripheral edges 7c, 8c, 9c of the chain insertion windows 7a, 8a, 9a is H=H in the transmission block 7, and the transmission block 8 In the transmission block 9, H=H+, and in the transmission block 9, H=H, and the heights H are different from each other.

That is, Ho is a predetermined reference dimension, and Ha H=
δ, Hz H+=1.56 (δ is a positive constant).

In a transmission chain 6 in which such transmission blocks 7, 8, 9 are arranged irregularly, assuming that the groove width of the pulley on which the transmission chain 6 is hung is constant, the inner peripheral edge of the chain of the transmission block A reference power transmission block 7 whose width W and height H from its inner circumferential edge to the inner circumferential edge of the chain insertion window with which the inner circumferential surface of the chain comes into pressure contact are predetermined reference dimensions.
Next, the width W remains unchanged and the height H is set to the reference dimension H.
When the transmission block 8 having an Hl lower than 0 is engaged and attached to the chain 10 as shown in FIG. The angle at which the pulley rotates until it engages with the pulley is wider than that in the case where two reference transmission blocks 7 are attached to the chain 10 adjacently and they sequentially engage with the chain 10.

This means that in the transmission block 8 having a low height H, the position of the inner peripheral side edge 8c of the insertion window with respect to the center of the boob is within the insertion window of the reference transmission block 7 with respect to the center of the pulley when the transmission block 8 is engaged with the pulley. As shown in FIG. 1, two reference transmission blocks 7 are positioned closer to each other than the peripheral edge 7C.
If the pulley rotates by the rotation angle α when the chain meshes with the pulley in sequence, the chain 10 will not be able to press its transmission bronck 8 against the pulley, and the chain will have to rotate a little more than that. If chain 10 is the transmission professional,
This is because the pulley 8 cannot be pressed against the pulley.

Therefore, when the transmission block 8 with the lower height H is placed next to the standard transmission block 7, the interval between the meshing sounds will be smaller than when the two standard transmission blocks 7 are placed next to each other. become longer.

Also, contrary to the above case, next to the reference transmission block 7, the above-mentioned radius W remains unchanged, and the above-mentioned height H is higher than the reference dimension H0.
When the transmission block 9, which is No. 2, is engaged and attached to the chain 10, the pulley rotates after the reference transmission block 7 meshes with the pulley and before the transmission bronck 9 with the high height H meshes with the bobbin. This angle is smaller than that in the case where two reference transmission blocks 7 are attached to the chain 10 adjacently and engage with the pulleys one after another. By the amount that the position of the inner peripheral edge 9c of the insertion window with respect to the pulley center 0 is further away from the position of the inner peripheral edge 7C of the reference transmission block 7 with respect to the pulley center in the state of meshing with the pulley,
When the two reference transmission blocks 7 sequentially mesh with the pulleys, the chain 1
This is because the chain 10 can press the transmission block 9 against the pulley even if the pulley rotates slightly less than that.

Therefore, when the transmission block 9 with the high height H is placed next to the standard transmission block 7, the interval between the meshing sounds will be smaller than when the two standard transmission broncs 7 are placed adjacent to each other. Becomes shorter.

Therefore, the above action is caused by the transmission proc.
Although we have explained the case where the height H of the next transmission block is different, the same effect will occur even if the transmission block 8 or 9 is placed in front of the transmission block 7 with the standard height H8, so the dimensions If the change in the interval of the meshing sound due to the difference δ is Δ, the interval of the meshing sound will be of seven types depending on the arrangement of the transmission blocks as shown in the table below.

Note that -0 indicates the interval between meshing sounds when two transmission bronches of the same shape are arranged adjacently.

Therefore, according to the transmission chain 6 in which three types of transmission broncs 7, 8.9 are arranged irregularly, even if the pitch length of the chain 10 is constant, meshing noise occurs during power transmission. Since the spacing between multiple transmission broncs is not constant and can be distributed into seven types, the magnitude of the meshing noise can be reduced to 1/7 of the conventional level by making the sounds generated by each other interfere, and the sound quality can also be reduced to its peak. It can be made into something calm and of good quality rather than a sound.

Further, in another embodiment shown in FIG. 3, a transmission block 9 whose height H is Ht higher than the reference dimension H0 is used, and this transmission block 9 is located between two reference transmission blocks 7. When the chain 10 is wound around a pulley, the bending angle θ of the chain 10 is larger than when all three are the reference transmission blocks 7, so the tension T of the chain 10 causes the pressure applied to the intermediate transmission block 9. The force F is larger than when it is the reference transmission block 7, but in this case as well, since the height H is higher than the reference dimension H0, the bending stress applied to the transmission block 9 is greater than when it is the reference transmission block 7. , they are almost equal, and there is no problem with the strength of the transmission block.

4 and 5 respectively show other embodiments of a transmission block that can be engaged and attached to the transmission chain of the present invention,
The transmission block 11 shown in FIG. 4 and the transmission block 12 shown in FIG. 5 each have windows through which two rows of chains are inserted, and constitute a double-row type transmission chain that transmits high torque.

Regarding these transmission blocks 11 and 12, as shown in the figure, the width of the inner peripheral side edge of the chain of the transmission block is constant, and the height from the inner peripheral side edge to the inner peripheral side edge of the chain insertion window is made constant. If a plurality of types of transmission blocks with different H values are arranged irregularly in the longitudinal direction of the chain, the same effects as in the embodiments shown in FIGS. 1 and 2 can be obtained.

The present invention is not limited to the above-described embodiments, and for example, the number of heights H may be further increased. In this way, the interval between meshing noises generated during power transmission can be further reduced. Since it can be dispersed into a large number of parts, the effect of reducing the magnitude of the meshing sound can be further increased.

In addition, in the embodiment shown in FIG.
One transmission block 7, 8, or 9 is engaged and attached to each row of links 10a into which b is inserted, but as shown in FIG. 6, multiple thin transmission blocks are stacked and engaged with the row of links. It may be made to be worn.

Furthermore, the number of chain rows may be further increased as required, and the above effects can also be achieved in such a case.

Effects of the Invention Thus, according to the transmission chain of the present invention, even if the pitch length of the chain is constant, the interval of the meshing noise generated during power transmission is not constant between a large number of transmission chains, but slightly Since it is possible to shift the pitch by increments, it is possible to effectively prevent the occurrence of extremely high level peak noise at a certain frequency, and it is possible to significantly reduce noise during power transmission.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of essential parts showing one embodiment of the present invention, and Fig. 2 shows (a), (b), and (C) three types of transmission blocks used in the embodiment shown in Fig. 1, respectively. A side view showing the
FIG. 3 is a front sectional view of main parts showing another embodiment of the present invention, and FIGS. 4 and 5 are side views respectively showing other embodiments of a power transmission block that can be engaged with and attached to the power transmission chain of the present invention. Figure 6 is a perspective view showing the main parts of a conventional continuously variable transmission chain, Figure 7 is a perspective view of a transmission block used in a conventional continuously variable transmission chain, and Figures 8 (a) and ( b) is an explanatory diagram showing, in cross section, the operating states of the transmission when decelerating and speeding up, respectively, using a transmission chain; Fig. 1 6...Transmission chain 7,8.9...Transmission blocks 7b, 8b, 9b...Inner peripheral side edge 7c, 8c, 9c...Inner peripheral side edge 1 of chain insertion window
0...Chain to> Fig. 2 (b) Fig. 4 Fig. 15 (C) Fig. 13 Fig. 6 Fig. 7

Claims (1)

[Claims] In a transmission chain in which a large number of transmission blocks each having a chain insertion window are engaged with each other in the longitudinal direction of the chain, a distance from the inner peripheral edge of the transmission block to the inner peripheral edge of the chain insertion window is provided. A transmission chain characterized by a large number of transmission blocks of different heights arranged irregularly in engagement with each other in the longitudinal direction of the chain.