JPH01169149A - Transmission belt - Google Patents

Abstract

PURPOSE:To make the assembling work of a transmission belt more efficient by forming one of outside link plates with a press-fitting hole having a shape and dimensions which make the press-fitted connection of all joint pins having different radius of curvature possible. CONSTITUTION:Rocker and joint pins come into contact with each other on their opposite faces having an arc-shaped cross section, and can vibrate. The joint pins whose opposite faces have three different radii of curvature, namely r1, r2, r3, are arranged in no particular order. A pin hole 11 of an outside link plate 10b is composed of an arc-shaped part 11a having a radius r0, a straight part 11b opposite to the part 11a, and arc-shaped parts 11c, 11d or a basic circle to mutually connect the parts 11a, 11b. The radius r0 is larger than the radii of curvature r1, r2, r3, and a dimension (t0) is smaller than corresponding dimensions t1, t2, t3 of the joint pin. Thus any of the three kinds of the joint pins is press-fittedly inserted into the pin hole 11, and only one kind of the outside link 10b is used to meet requirements, resulting in unnecessity for considering the combination of parts in assembling a transmission belt.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a power transmission belt.

(B) Prior art As a conventional power transmission belt, for example, Japanese Patent Application Laid-open No. 59-200
There is one shown in Publication No. 838. The transmission belt shown in this figure is composed of an endless chain in which a plurality of link plates are successively connected by bins, and a large number of load blocks attached to the chain. The chain passes through a window E1 in the load block so that the chain bin holds the load block in place. As the bottle, a pair of rocker pins and joint pins that are mutually swingable on arcuate opposing surfaces are used.

(c) Problems to be Solved by the Invention However, the conventional power transmission belt as described above has a problem in that it generates a lot of noise during transmission. That is,
The rocker pin and the joint pin all have opposing surfaces with the same radius of curvature, and because they swing on these opposing surfaces, the circumferential speed of the power transmission belt fluctuates in a constant cycle. Therefore, the level of noise generated when the transmission belt rotates around the pulley increases at a predetermined frequency.

In order to solve these problems, there is a method of increasing the radius of curvature of the rocker pin and joint pin to 2 MA class or higher to reduce the periodicity of changes in the circumferential speed of the transmission belt when the transmission belt wraps around the pulley. . Thereby, the noise peak level of the predetermined frequency can be reduced. However, in this case, since a plurality of joint pins having different radii of curvature are used, a corresponding plurality of types of outer link plates are required. In other words, the chain is made by press-fitting the joint pin into the press-fitting hole in the outer link plate,
It is assembled by caulking the joint pins, and if a plurality of radii of curvature are set for the facing surface of the joint pin, it is necessary to set the type of outer link plate corresponding to the radius of curvature. For this reason, it is necessary to manufacture a plurality of types of outer link plates and manage them so that they are combined in a predetermined manner during assembly. Therefore, there is a problem that productivity is poor. The present invention aims to solve these problems.

(d) Means for solving the problems The present invention uses one type of outer link plate into which all the joint pins can be press-fitted.
Solve the above problems. That is, the power transmission belt according to the present invention is assembled to a chain made into an endless shape by sequentially connecting a plurality of link plates with rocker pins and joint pins that can swing in contact with each other on opposing surfaces having an arcuate cross section. It consists of a plurality of load blocks with tapered surfaces, and 2g or higher type rocker pins and joint pins with different radii of curvature on opposing surfaces are used, and the outer link plate of the link plates that make up the chain. is intended for power transmission belts that have press-fit holes for press-fitting joint pins, and the above-mentioned outer link plate has a shape and size that allows it to be connected in a press-fit state to all joint pins with different radii of curvature. The gist is that one type of material with holes is used.

(e) Since two or more types of working rocker pins and joint pins with different radii of curvature are set, the periodicity of changes in the circumferential speed of the transmission belt when the transmission belt is wound around the pulleys is reduced. Although a plurality of types of joint pins are set in this way, the outer link plate is capable of being press-fitted and connected to all of the joint pins having different radii of curvature. Therefore, a chain can be constructed with one type of outer link plate. This greatly improves productivity.

(f) Example 2 to 5 show a transmission belt 5° according to an embodiment of the present invention.

This transmission belt 50 has two chains 13 made up of a plurality of link plates 10, to which a number of load blocks 14 are attached. two chains 1
3 are respectively inserted into the chain insertion portions of the load block 14 from both sides (see FIG. 5). chain 1
3, as shown in FIGS. 6 and 7, link plates 10a and 10b are connected to connecting pins 12a, 12b, 12c...
It is connected by. The connecting pin 12a is composed of a rocker pin 12a1 and a joint pin 12a2, and the rocker pin 12g and the joint pin 12a2 are capable of swinging on opposing surfaces having an arcuate cross section. The radii of curvature of the opposing surfaces are both r. The connecting pin 12b basically has the same structure as the connecting pin 12a, but the rocker pin 12b and the joint pin 1
Let r2 be the radius of curvature of the opposing surface of 2b2. Similarly, the connecting pin 12c has a radius of curvature r3 for the rocker pin 12c and the joint pin 12c2. In this way, the rocker pins and joint pins having three types of curvature radii of ' l s r 2 and ' 3 are arranged in random order.
and 10b, two types are set as shown in FIG. That is, the inner link plate 1 at the center
0a, and an outer link plate 10b arranged at the outermost side of the chain 13. The inner link plate 10a has a basically circular pin hole that receives both a rocker pin and a joint pin (however, it has a non-circular portion for regulating the rocker pin in a predetermined positional relationship). . On the other hand, the outer link plate 10b has a substantially semicircular pin hole corresponding to the cross-sectional shape of the joint pin. That is, the pin hole 11 of the outer link plate 10b
is the radius r, as shown in FIG. It is composed of an arcuate portion 11a, a straight portion 11b on the opposite side thereof, and an arcuate portion 11c of a reference circle connecting these portions and a lid. ro is set as a value larger than the aforementioned rl, r2, and r3, and the dimension circle 0 in FIG. 1 indicates the corresponding dimension 1. of the joint pins 12a2, 12b2, and 12C2 shown in FIGS. ．． 12 and t3. This one type is used for all the outer link plates 10b of the chain 13. As mentioned above, the size and shape of the pin hole 11 of the outer link plate Job are set, so when assembling the chain 13, no matter which one of the joint pins 12a2, 12b2, and 12c2 of the three sleeves is used, When inserted into the hole 11, both are press-fitted.

As shown in FIG. 11, such a transmission belt 50 has two
It is used by being wound around two pulleys 52 and 54.

The pulleys 52 and 54 have fixed conical members 52a and 54a, respectively, and movable conical members 52b and 54b, which allow the conical surfaces 32 and 3 to face each other.
4 and conical surfaces 32' and 34'. The load block 14 has tapers 14a at both left and right ends that contact the conical surfaces 32 and 34 of the pulley, and the conical surfaces 32' and 34', respectively.

As described above, in this power transmission belt 50, the three types of rocker pins and joint pins have different radii of curvature rl, r2, and r3, so that the noise peak level of a predetermined frequency component is reduced. In addition, the outer link plate 10b of the chain 13 is of the persimmon type, whereas the outer link plate 10b of the chain 13 is of the persimmon type;
Types of joint pins 12a2, 12b2 and 12c2
are press-fitted, so three types of joint pins 1
Compared to the case where dedicated outer link plates are manufactured for each of 2a2, 12b2 and 12c2, the manufacture of the outer link plate itself is simplified, and during assembly,
Since there is no need to consider the combination of the outer link plate and the joint pin, assembly work efficiency is also improved.

(G) As described in detail, according to the present invention, joint pins having different radii of curvature can be press-fitted into the outer link plate of the persimmon type, so manufacturing of the outer link plate is simplified, and Assembling work is also significantly more efficient as selective combinations are no longer required.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an outer link plate according to the present invention, FIG. 2 is a diagram showing a power transmission belt according to an actual example of the present invention, and FIG. 3 is a cross section taken along the III-III line in FIG. Figure 4 is a front view of the transmission belt shown in Figure 3, and Figure 5 is a front view of the transmission belt shown in Figure 3.
6 is a plan view of the chain, FIG. 7 is a side view of the chain shown in FIG. 6, 8.9,
FIG. 10 is a sectional view of joint pins of different wire types, and FIG. 11 is a view showing a state in which a transmission belt is wound around a booley. 10... Link plate, 11... Pin hole, 12a
,,12b+,12c,--rocker pin, 12a
2, 12b2, 12c2---Joint pin, 13・
...Chain, 14...Load block.

Claims (1)

[Scope of Claims] A chain made endless by sequentially connecting a plurality of link plates with rocker pins and joint pins that can swing in contact with each other on opposing surfaces having an arcuate cross section;
It consists of a plurality of load blocks with tapered surfaces that are assembled to the chain, and two or more types of rocker pins and joint pins with different radii of curvature of opposing surfaces are used, and the link plates that make up the chain Our outer link plate is a power transmission belt that has press-fit holes for press-fitting joint pins, and as the above-mentioned outer link plate, it has a shape and size that allows it to be press-fitted to all joint pins with different radii of curvature. A power transmission belt characterized in that one type of power transmission belt is used that has holes for use.