JPH01266342A - Transmission chain having multiple link plates - Google Patents

Abstract

PURPOSE:To intend to improve tensile strength of a chain for increasing loading function for transfer load by installing tandem washers like spectacles on both ends of a connecting pin, and making the center portion in suspension of the spectacles like tandem washer an easy broken form or an elastic bendable form. CONSTITUTION:Many link plates L are arranged and connected with connecting pins P. Connecting pins P are loosely inserted into many link plates L, and spectacles like tandem washers 2 are installed on suspending and press fitting to both ends of a pair of connecting pins P neighboring to each other. The center portion in suspension of the spectacles like tandem washer 2 is made in a easy broken form 2' or an elastic bendable form. In such way, it can be possible to intend to improve tensile strength of a gearing chain and to increase loaded function for transfer load.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a power transmission chain.

Conventional technology Conventional transmission chains with multiple link plates include meshing transmission chains having toothed link plates that mesh with a drive sprocket, and friction transmission chains that are squeezed between a pair of opposing conical pulleys. , each link plate is connected using a rocker cylindrical pin or a round pin with a circular cross section, and in a meshing transmission chain with toothed link plates, the chain moves laterally and comes off the sprocket. In order to prevent this, the guide brake (G) guided on the side surface of the sprocket as shown in FIGS. P, P (the illustrated pin is a round pin, but it may also be a rocker joint pin), or a guide plate (guided by a guide circumferential groove provided on the circumferential surface of the sprocket). (not shown) are sandwiched between multiple toothed link plates L and fixed to a pair of adjacent connecting pins using a strong electric current. Although it has a guiding surface to be guided, it does not have a tooth profile that meshes with the sprocket, so it does not share the power transmission load at all, and in addition to the chain guiding function, the connecting pin is a round pin. for,
It has the function of preventing the round pin from rotating and the connecting pin from being removed, and when the connecting pin is a rocker joint pin, it has the function of preventing the connecting pin from being removed.

In addition, a friction transmission chain that does not have teeth on the link plates has a link plate that does not share any transmitted load and is press-fitted onto both ends of the connecting pin to prevent the connecting pin from being pulled out. was.

Therefore, the pitch of the connecting pin insertion holes of the guide plate G or the pull-out prevention link plate is slightly larger than the pitch of the connecting pin insertion holes provided in the large number of transmission load true blue link plates that transmit power. When a transmission tension is applied to the link plate, the tension load is shared only by the many transmission load-bearing link plates into which connecting pins are inserted loosely, and the tension load is not applied at all to the guide brake (G) or the link plate that cannot be removed. It was designed not to occur.

Problems to be Solved by the Invention In the conventional power transmission chain described above, although the guide plate or the pull-out prevention link plate is connected as one of the link plates of the chain, it does not share the tension load of the chain at all. Not present as a no-load link plate.

The present invention improves the tensile strength of the transmission chain by sharing the tension load with a guide plate that does not share the tension load or a link plate that is attached as a stopper, thereby increasing the transmission load function. The purpose is to

Means for Solving the Problems In order to achieve the above object, the present invention has the following means. In other words, in order to share the tension load of the chain with a no-load link plate such as a guide plate or a pull-out prevention link plate that was used as a pull-out stopper, a large number of connecting pins are inserted into the no-load link plate without being press-fitted to the no-load link plate. Similarly to the loaded link plate, the connecting pins are inserted loosely, and the pitch of the connecting pin insertion holes of the non-load link plate is also made equal to the connecting pin insertion hole pitch of the loaded link plate.

Therefore, the unloaded link plate can share the tension load of the chain in the same way as a number of loaded link plates.

Then, in order to prevent the connecting pins from coming off from a large number of loosely inserted link plates due to loosely inserting the no-load link plates into the connecting pins instead of press-fitting them, washers were press-fitted on both ends of the connecting pins, and washers were also installed. It has a shape that is suspended and attached to a pair of adjacent connecting pins, and the suspension center portion thereof has an easily breakable shape or an elastic curved shape that can be stretched in the direction of tension.

When a transmitted load is applied to the working chain, tension in the direction of separation acts on adjacent connecting pins, and the tension load in the direction of separation that acts on a pair of adjacent connecting pins first A concentrated load is applied to the spectacle-shaped double washer that is press-fitted into the pin, and after the easily breakable portion is broken or the elastic curved portion is stretched, the load is applied to all link plates.

Since each broken washer part is press-fitted into both ends of each connecting pin, the connecting pins are prevented from coming off from the multiple overlapping loosely inserted link plates, and the broken surface of the center portion of the washer is When the chain is bent, they interfere and collide with each other, preventing the respective connecting pins from freely rotating.

Further, the washer in which the elastic curved portion is extended has the function of preventing the respective connecting pins from being pulled out and rotating.

Therefore, the guide link plate has a guiding function for the sprocket of the chain, and works together with the toothed link plate to share the tension load of the chain, and the conventional locking link plate also shares the tension load of the chain. It is something that can be done.

Embodiment FIGS. 1(a) and 1(b) show a first embodiment of a meshing power transmission chain in which a round pin with a circular cross section is used as a connecting pin P,
A guide link plate 1.1 is loosely inserted into both ends of a pair of adjacent connecting pins P, P of a connecting pin in which a large number of toothed link plates L are overlapped and loosely connected, and the outer side of the guide link plate 1.1 is A connecting pin P protrudes from the P end, and a pair of glasses-shaped washers 2 are press-fitted and suspended at the ends of a pair of adjacent connecting pins at the P end, and a pinching part 2' is provided at the suspended central part of the washer 2, as shown in FIG. (The only difference in Fig. 2 from the washer shown in Fig. 1 is that the connecting pin insertion hole is for a rocker joint pin.) Figure 3 (a)
, (c), the wall may be made into an easily breakable shape 2' with a notch 2", or a washer 3 as shown in FIG.
The suspension central portion may be formed into an elastic curved shape 3'.

Therefore, when a tension load is applied to the interlocking transmission chain shown in FIG.
The high fracture shape portion 2'' in the center of the guide link plate 1.1 breaks, and then tension is applied to all the link plates into which the connecting pins are loosely inserted.
shares the tension load of the chain with the toothed link plates L and L, and the broken and separated washers 2 press-fitted into both ends of each connecting pin are connected to the guide link plate 1゜l and a large number of toothed link brakes L, This prevents L from coming off the connecting pin, and the fracture separation surfaces of the washers interfere with each other to prevent rotation of the connecting pin.

FIG. 4 is a plan view of another embodiment of the double eyeglass-shaped washer 3, in which the suspended central portion of the double washer 3 has an elastic curved shape 3' that can be stretched in the tension direction. can be,
When the connecting pin is a round pin, it is suitable for preventing rotation of the round pin.

In other words, when the connecting pin is a round pin, the washer is required not only to prevent the connecting pin from being pulled out, but also to prevent the round pin from rotating, so when tension is applied to the chain, the The elastic curved shape 3' portion stretches in the tension direction,
It is possible to prevent each round pin from rotating in a state where it is suspended and press-fitted to both ends of a pair of adjacent round pins without breaking.

FIGS. 5(a) and 5(b) are a front view and a plan sectional view of a main part of a friction transmission chain when the connecting pin is a rocker joint pin P', and shows a large number of load link plates L' Outermost link plates 1', 1', which correspond to conventional no-load link plates for preventing removal, are loosely inserted into both shaft ends of the connecting pin P', which is loosely inserted into the link plate 1.
', 1' has a second pin at the shaft end of the adjacent connecting pin P'.
A pair of eyeglass-shaped washers 2 shown in the figure are press-fitted and suspended, and the suspended center portion of the washer is inserted into an easily breakable shape 2'.

When the connecting pin is a rocker joint pin, the cross-sectional shape of the pin is not circular as shown in the figure, and therefore the connecting pin loose insertion holes provided through all link plates are also non-circular holes. The pin will not rotate within the loose insertion hole, but since the connecting pin press-fit hole penetrated through the box-shaped two connecting pin washers is a non-circular hole, when a tension load is applied to the chain, There is a risk that concentrated stress will act on a specific portion of the non-circular hole, causing cracks to develop from the hole toward the outer edge of the washer, causing the hole to break.

Therefore, by making the suspension central part of the double pair washer 2 into an easily breakable shape 2', when a tension load is applied to the chain, before concentrated stress acts on the specific part of the hole. The high breakage shape portion 2' breaks quickly, thereby preventing the non-circular connecting pin insertion hole provided through the link plate from breaking.

Therefore, the washer 2 that broke at the high break shape portion 2'
Since it is fixed to both ends of each connecting pin, the outermost link play) 1', 1' and the load link play)
The connecting pin P' will not come off from L', L', and the outermost link plates 41', 1' can share the tension load of the chain together with the load link plates.

In addition, the spectacle-shaped double washer 2.3. In the above embodiment, the guide link plates 1.1 or the outermost link plates l', 1' are overlapped or attached in the same phase, but as shown in FIG. 1′.

Of course, it is possible to mount it with a 1/2 pitch offset from 1'.

Effects of the Invention As described above, the present invention provides that the conventional guide plate or the outermost link plate has only the function of guiding the transmission chain and the function of preventing the connecting pin from being pulled out (in the case of round pins, the function of preventing the chain from rotating). We have improved on the lack of a tensile load sharing function, and have provided a pair of eyeglass-shaped washers with a function to prevent the connecting pin from rotating and being removed without applying a tensile load by press-fitting it into the connecting pin. The guide plate in a mesh transmission chain is a guide link plate with a loosely inserted connecting pin, which has both the function of guiding the chain and the function of sharing the chain tension load, and the outermost link plate of a friction transmission chain has a connecting pin. By inserting the chain loosely and providing the function of sharing the chain tension load,
It is possible to improve the tension load of the chain and increase the transmission capacity.Furthermore, by making the washer into a box shape, it is easy to press-fit the washer into the rocker joint pin. By making the central part of the suspension of the gold into an easily breakable shape or an elastic curved shape, the hole in the washer is prevented from breaking, and when the easily breakable part is broken, the rotation of the connecting pin is prevented due to the interference collision of the broken surface. It has been made possible, and its effects are significant.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention, and Figure 1(a)
, (9) are a front view and a plan view of the main parts of an interlocking power transmission chain in which the connecting pin is a round pin, respectively, FIG. 2 is an enlarged front view of the first embodiment of the double box washer, FIG. 3(a), (b)
4 is an enlarged front view and a plan view of another embodiment of the double box washer, FIG. 4 is an enlarged plan view of still another embodiment of the double box washer, and FIG. 5(a). (b) is an enlarged front view and plan sectional view of the main part of the friction transmission chain, respectively, and Figs. 6 (a) and (b) respectively show the press-fitting position of the rocker jig int pin washer at 1 according to the case of Fig. 5. FIGS. 7(a) and 7(b) are an enlarged front view and a plan sectional view of the main part of a conventional example of a toothed transmission chain, respectively, which are press-fitted with an offset of /2 pitches. 1... Guide plate 2.3. ...Eyeglass-shaped double washer 2'...Easy-to-break part 3'...Elastic curved part P...Round pin P'...Mouth/linker joint pin Fig. 1 (b) 2 Figure 3 (G) (b) 4th f! 1

Claims (2)

[Claims] (1) In a transmission chain having multiple link plates in which a large number of link plates are overlapped and connected by connecting pins, the connecting pins are loosely inserted into the multiple link plates and suspended and press-fitted into both ends of a pair of adjacent connecting pins. A power transmission chain equipped with a pair of spectacle-shaped washers, the suspension center portion of which is shaped to be easily broken. (2) In a power transmission chain with multiple link plates in which a large number of link plates are overlapped and connected by round pins with a circular cross section, the round pins are loosely inserted into the many link plates and suspended on both sides of a pair of adjacent round pins. A power transmission chain in which a pair of spectacle-shaped washers are press-fitted, and a suspension center portion of the double-glass-shaped washer has an elastically curved shape.