JPS63280946A - Transmission belt - Google Patents

Abstract

PURPOSE:To make a mass production possible through improving the accuracy of processing in a transmission belt which is comprised of a great number of metal blocks and hoops for connecting those to each other by processing and manufacturing a metal block into two divided pieces respectively, and then joining the two in a body. CONSTITUTION:A main piece 7 is manufactured in one with a base 2a, which has two inclined planes 2b, 2c important for a metal block to function and lower saddle parts 2d, a base 2a, which has a head 2e and both a projection 2h and a recessed part 2i for engagement, and a head central portion 6 which has a head 2e and both a projection 2h and a recessed part 2i for engagement. In addition, the other head 2f portion except the head central portion 6, that is, a subordinate piece 9 which has a head sides portion 8 and saddle parts 2g, is manufacturing separately. And further, by joining the main piece 7 and the subordinate piece 9, which have been manufactured dividedly and processed precisely, through a welding means, a bonding means and the like into an integrated metal block 2, the processing of the inclined planes 2b, 2c which are most important functionally, the spherical processing of the lower saddle parts 2d, and the chamber processing of the head 2e can be performed with a high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a belt transmission method known as one of the belt transmission systems used in continuously variable transmissions. The present invention relates to an improvement in a metal block that is a constituent material of a conductive belt consisting of a metal hoop and a boob on which the belt is stretched so as to be able to circulate.

(Prior technology) A large number of metal blocks are stacked in parallel in a mutually polymerized state,
All the blocks are jointly supported by metal hoops that are fitted and engaged in a circumferential manner, forming an endless annular belt, and this belt is attached to each inner surface of a pair of side plates with a variable distance between their axes. It is stretched between two ■ pulleys that have a V-shaped groove formed by the tapered inclined surface, and one of the ■
By inputting rotational driving force to the pulley side, it is transmitted to the other V-pulley via the belt, and stepless speed change is possible by changing the V-shaped groove. This is a well-known method as seen in Japanese Patent Publication No. 57-23820.

The details are given in the publication of the same issue, but the outline will be summarized in the first part below.
0.1) Explain the diagram. The conductive belt l consists of two groups of many metal blocks and one or more metal hoops 3 (two common hoops are shown in the figure) that jointly support them.
A large number of metal protrusions 2 are arranged in parallel in an overlapping state, and an endless annular metal hoop 3 extends over the hoop fitting grooves 5.5 formed on both sides of the block 2 in the width direction. , 3 are fitted into each other to form an endless annular belt 1. The metal block 2 includes a substantially trapezoidal base 2a, a substantially square columnar neck 2e standing at the center of the upper end of the base 2a, and a substantially trapezoidal neck 2e.
A generally roof-shaped head 2f that spreads out to the upper end is formed in a series, and on both sides in the width direction of the base 2a, a pair of side plates 4a, each of which has an opposing inner surface formed by a tapered inclined surface 4b.
, 4b to form a V-shaped groove; (2) sloped surfaces 2b, 2b in contact with the tapered sloped surfaces 4b, 4b of the pulley 4; and neck portion 2e of the base 2a;
The upper end excluding the continuous part with the metal hoop 3 is the lower saddle part 2d, 2d on which the metal hoop 3 is placed, and as shown in FIG. An inclined surface 2c is formed in the width direction. In the substantially roof-shaped head 2r that continues to the upper end of the neck portion 2e, the lower ends on both left and right sides in the width direction, excluding the portion continuing from the neck portion 2e, are connected to the upper saddle portion 2 corresponding to the lower saddle portion 2d.
g, 2g, and on both the front and rear surfaces of the head 2f, as shown in FIG. The portion 2h and the recess 21 are formed in a corresponding manner, and the hoop fitting groove portions 5, 5 are formed between the upper and lower saddle portions 2d, 2g via the neck portion 2e. As is known, the metal block 2 is a plate body manufactured as a single item by a steel plate punching method, a metal powder sintering method, etc., and its wall thickness is approximately 1.5 to 3 mm. 3, as shown in Fig. 1), is made by integrating a plurality of endless annular loops 3a (for example, about 10 loops) made of thin steel plates with a thickness of about 0.2 tm by fitting them tightly together. be. An endless annular conductive bell formed by such a group of metal blocks and a metal hoop is stretched between a pair of pulleys 4, 4, and the slopes 2b, 2b of the adjacent blocks 2 are used as the belt side surface to connect both pulleys 4. a tapered inclined surface 4b forming a V-shaped groove;
4b, and by inputting rotational driving force to one V-pulley 4, the rotational driving force is transmitted to the other V-pulley 4 by the frictional force generated between the belt and the ■-shaped groove.
At this time, torque transmission is obtained through the pushing force of each block 2 that is lined up, and by varying the distance between the axes of the pair of side plates 4a, 4a in the V pulley 4, the effective diameter (hanging diameter) of the bell H can be adjusted. Through this change, continuously variable speed is achieved.

(Problems to be Solved by the Invention) In processing and manufacturing the metal block 2 described above, there are problems in the following points. As mentioned earlier, block 2
The base portion 2a, neck portion 2e, and head portion 2f are manufactured as one body using steel plate punching means or metal powder sintering means. There are many conditions regarding shape and dimensions.

In other words, in Fig. 4.5, the slopes 2b, 2b, which are the side surfaces of the belt at the base 2a, match the tapered slopes 4b, 4b of the V-pulley 4, so that the symmetrical slopes of the angle α° are machined with high precision. It is required that there be, and the slope 2
As is known, when the belt 1 goes around the V-shaped groove of the V-pulley 4, the blocks 2 move radially in parallel and maintain a mutual interlocking relationship. Since the upper end of the surface 2c comes into contact with and pushes against the vertical rear surface of the front block 2, its angle and slope shape also require highly accurate machining.

Furthermore, since the lower saddle parts 2d, 2d on which the metal hoop 3 is placed in the base part 2a are surfaces in which the hoop 3 directly contacts, when the block 2 goes around the ■-shaped groove, the metal In order to avoid damaging the hoop 3, the radius R3 is set as shown in FIG.
In order to provide a curved surface shape and reduce contact friction even when traveling in a straight line, it is necessary to provide a radius curved surface of R1 as shown in Fig. 4, which requires complex spherical surface machining. Ru.

Furthermore, in the neck portion 2e that continues to the center of the upper end of the base portion 2a,
Since the neck portion 2e faces one side in the longitudinal direction of the metal hoop 3 on both sides, when the block 2 is in a meandering state and hits the hoop 3 while running, the neck portion 2e is designed so that the neck portion 2e does not damage the hoop 3. As shown in FIG. 8, it is necessary to perform chamfering on the four corners of the cross section of the rectangular prism shape to form a curved surface R5 with a small radius.

In addition, in the head 2f following the neck 2e, when processing the convex portions 2h and 2i provided to prevent the head from shifting and to keep it from steadying, strict correspondence in position and size is required.
Upper saddle portion 2g at the lower end on both sides in the width direction.

When machining 2g, it does not come into direct contact with the metal hoop 3, but the upper saddle part 2g must be as precise as possible to avoid damaging the loop due to abnormal movement during operation on a simple flat straight line surface. Although not required, spherical surface machining with radii R2 and R4 shown in FIGS. 4 and 7 is required, and the overall positional relationship and dimensions also
．． Among the dimensions a, b, c, and d shown in Fig. 5, a, b, and d require strict dimension setting. In order to satisfy these requirements, simply punching or die forging is not sufficient for both the steel plate punching means and the metal powder sintering means, and finishing processing by grinding and polishing of each part is required. At this time, the head 2f, neck 2e, and base 2a of the block 2 have been preformed or intermediately processed in a series, so that the upper and lower saddle portions 2g, 2d, and neck 2e can be spherically or curved. This is extremely difficult due to the presence of the hoop insertion grooves 5, 5, and the machine processing is required for each individual 7'o-piece, making mass production difficult and costly. . Particularly in the spherical machining of the upper and lower saddle parts 2g and 2d, it is impossible to do so using the blanking (fine blanking) method conventionally used as a precision machining method. When finish forming by die forging in the process, performing such spherical processing using the upper and lower dies naturally causes "burrs" to occur at the joint between the two dies, and such "burrs" are especially caused by the hoop 3 being directly bundled. The presence of the hoop fitting grooves 5, 5, combined with the narrow groove spacing, significantly restricts precision machining of the respective parts, such as the fact that this is not possible in the lower saddle portion 2d.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention fabricates the metal block 2 into two divided pieces, and then joins them together to form the desired object. It provides blocks with high precision in size and shape that can be easily mass-produced.Specifically, a large number of metal blocks are stacked on top of each other and supported by metal hoops. In the transmission belt, which is configured in an endless annular shape and is stretched between the driving and driven pulleys to transmit rotational driving force, the metal block has an inclined surface that contacts the V-shaped groove of the boot on both sides in the width direction A base having a sloped surface on the front surface continuing to the sloped surface, and a metal hoop-mounted downstream saddle portion formed on the left and right sides of the upper end, a neck portion standing at the center of the upper end of the base portion, and a substantially roof-shaped portion extending to the upper end of the neck portion. The head is provided with an upper saddle portion corresponding to the lower saddle portion on both sides of the lower end, and has locking unevenness portions on both front and rear surfaces of the center, and the head is provided with the base portion, neck portion, and the locking unevenness portion. A central portion of the head is integrally manufactured to the required shape and dimensions, and while the central portion of the head is removed, both side portions of the head including the upper saddle portion are separately manufactured to the required shape and dimensions;
The purpose is to join and integrate the two.

(Function) According to the above-mentioned technical means of the present invention, as shown in FIG. 1, it has inclined surfaces 2b, 2b on both sides in the width direction, and the front surface continuing from both inclined surfaces 2b, 2b is an inclined surface. 2c
and a lower saddle portion 2d whose upper end is further divided into left and right parts.
d, a neck 2e that is independent from the center of the upper end of the base 2a, and a central portion of the head that continues from the upper end of the neck 2e and has an engaging protrusion 2h and a recess 21 formed at corresponding positions on both the front and rear surfaces thereof. 6 is a main piece 7 integrally formed, and the remaining part of the head 2f excluding the head central part 6, that is, the upper saddle part 2 corresponding to the lower saddle parts 2d, 2d at the lower end thereof.
Both sides of the head part 8.8 having a weight of 2g and 2g are used as a shaft piece 9 formed separately from the main piece 7, and the main and secondary pieces 7 are separately processed and manufactured.
, 9 are joined and integrated by welding means, adhesive means, etc. to form the metal block 2 as shown in the figure, so that the functionally most important parts, the base part 2a, the neck part 2e, and the inclined surface 2b at the head central part 6, are formed. , 2c, lower saddle part 2
In the main piece 7 having the neck portion 2e, the neck portion 2e, and the head center portion 6, there are no conventional hoop fitting groove portions 5, 5, so that the above-mentioned inclined surface 2b is not present.
.

Processing of 2c, spherical processing of lower saddle part 2d, neck part 2
The chamfering of the four corners in e and the machining and manufacturing of the engaging uneven portions 2h and 2i in the central portion 6 of the head are extremely facilitated and can be manufactured with high precision, and the situation is the same for the shaft piece 9. , and this also makes it easier to mass-produce it.

(Example) A suitable example of the metal block according to the present invention will be described with reference to FIGS. 1 to 3.

In the embodiment shown in FIG. 1, in the main piece 7 and the shaft piece 9 constituting the metal block 2, the main piece 7 has inclined surfaces 2b, 2b on both sides in the width direction, and of the front and rear surfaces following the double-ended slopes, A base 2a that includes the entire inclined surface 2c and lower saddle parts 2d and 2d on the front side, the entire neck 2e that stands up at the center of the upper end of the base 2a, and further extends the neck 2e to protrude at positions corresponding to both front and rear surfaces. The part 2h and the head central part 6 in which the concave part 21 is formed are integrally formed.In the embodiment, the head central part 6 has a substantially arch-shaped curved surface at its upper end, and The height does not reach the approximately roof-shaped top portion 10 at 2f. On the other hand, the shaft piece 9 is integrally formed with side parts 8, 8 that protrude on both left and right sides, and a top part 10 that connects the two sides.
A joining notch 1) that fits the central part 6 of the head is provided at the center, and each lower end of the side parts 8.8 has an upper saddle having a spherical surface corresponding to the lower saddle parts 2d, 2d on the base 2a side. The main piece 7 and the shaft piece 9 are manufactured separately, and then the main piece 7 is formed.
The central part 6 of the head, the joining notches 1) provided on both side parts 8, 8, and the top 10 of the head are integrated by welding or gluing. At this time, any welding method can be used, such as resistance welding, electron beam welding, plasma welding, microplasma welding, laser welding, etc. For the joint surface, for example, a combination of fine blanking processing and electron beam welding can be used. Precise integration is easily possible within the permissible dimension C (see FIG. 4) of the hoop insertion groove 5.

Further, these can be manufactured by either a steel plate punching method or a metal powder sintering method.

In the embodiment shown in FIG. 2, the upper end of the head center portion 6 of the main piece 7 is not formed into an arch-shaped curved surface as in the embodiment shown in FIG. The rest is completely the same as the embodiment shown in FIG. 1.

In the embodiment shown in FIG. 3, the apex 1o of the head 2f is integrated into the central portion 6, as indicated by the central portion 68 of the head. For example, on the shaft piece 9 side, as shown in the figure, it is divided into two shaft pieces 9a, 9a with only the side parts 8, 8 having upper saddle parts 2g, 2g at the lower end, and the head The central portion 6a and the side portions 8 are joined together by straight surfaces. The rest is the same as the embodiment shown in FIG. 1.2.

(Effects of the Invention) The metal block 2 of the present invention is superior in that it overcomes the precision machining difficulties of conventional blocks and allows high precision blocks to be obtained with ease of mass production. That is, in the present invention, the conventional means of fabricating the base portion 2as, neck portion 2e, and head portion 2f constituting the block integrally through the hoop insertion groove portion 5.5 is eliminated, and the functionally important sloped surfaces 2b, 2b,
A main piece 7 that integrates a base 2a having an inclined surface 2c and lower saddle portions 2d, a head central portion 6 having a neck portion 2e, an engaging convex portion 2h, and a recess 21; Other parts of the head 2f except for the parts 8 on both sides of the head
．． 8 and the upper saddle portion 2g, and a shaft piece 9 having 2g are manufactured separately, and each part is precisely machined and then combined to form the block 2. Therefore, the angle of the inclined surface 2b of the main piece 7 is Precision machining under α°, radius R of the lower saddle part 2d, spherical machining under R3, R of the four corners of the neck part 2e
The chamfering process by 5, the positioning of the parallel connections of each block, and the forming process at the corresponding positions of the engagement uneven parts 2h and 2i for the steady rest are all extremely easy because there is no groove part 5 at all. Strict high-precision machining can be sufficiently achieved regardless of mechanical grinding, grinding means, or precision die forging, and the same is true for the machining of the upper saddle portion 2g of the shaft piece 9. Even in basic prototype production, compared to the conventional method of producing the block 2, it is extremely easy to separately produce the main piece 7 and the shaft piece 9, either by punching steel plates or by sintering. Therefore, it is possible to mass-produce the product and obtain a significant cost reduction effect, and the dividing position is the central part 6 and both side parts 8.8 on the block head 2f side, for example, as shown in Fig. 9. As illustrated in the neck part 2e
Compared to the method of dividing the belt into upper and lower halves from the center, it is significantly advantageous in terms of strength and processing, and has an excellent effect as an improvement on the metal block, which is important as a pushing element in this type of conductive belt.

[Brief explanation of the drawing]

1.2.3 Each figure is a front view of the embodiment of the block of the present invention, FIG. 4.5 is a front view and longitudinal side view of a conventional block, FIG. 6 is a saddle portion of the same as above, and FIG. 7 is a saddle of the same as above FIG. 8 is a cross-sectional view of the neck, FIG. 9 is an explanatory diagram of an example of a joint block, FIG. ) is a partially cutaway slope view of the main part of the same belt, and FIG. 12 is a side view of an example of the same block. ■...Conduction belt, 2...Metal block, 3...
Metal hoop, 2a...Base, 2b, 2c...Slope, 2d...Lower saddle part, 2e...Neck, 2f...
・Head, 2g... Upper saddle part, 2h... Convex part, 21
... recessed part, 6 ... central part of head, 7 ... main piece, 8
... Both sides of the head, 9... Shaft piece.

Claims (1)

[Claims] (1) In a transmission belt configured in an endless ring shape with a large number of metal blocks overlapping each other and jointly supported by metal hoops, the transmission belt transmits rotational driving force by being stretched between driving and driven pulleys. The metal block has sloped surfaces in contact with the V-shaped groove of the V-pulley on both sides in the width direction, a sloped surface continuous to the sloped surface on the front surface, and lower saddle portions for placing metal hoops on the left and right sides of the upper end. A base, a neck that stands up at the center of the upper end of the base, a substantially roof-shaped upper saddle that extends to the upper end of the neck, and an upper saddle that corresponds to the lower saddle on both sides of the lower end, and engaging uneven parts on both front and rear surfaces of the center. The center part of the head including the base, the neck and the engagement uneven part is integrally manufactured in the desired shape and dimensions, and the center part of the head is removed and the upper saddle part is provided. A conduction belt characterized in that both side parts of the head part are separately manufactured in a required shape and size, and the two parts are joined and integrated.