JPH04503557A - Belt structure, rotatable pulley, combination thereof, and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Belt structure, rotatable pulley and Combinations thereof and methods for producing them 1 Okudan 1 The present invention provides a novel endless power transmission belt structure and a rotation for such a belt structure. Regarding rotatable pulleys and combinations of belt structures and pulleys, Regarding the manufacturing method.

1 blood 11 a plurality of alternatingly spaced longitudinally extending projections of the same shape having opposite edges; an endless power transmission belt structure having an inner surface defining a section and a groove; A plurality of alternately spaced longitudinal extensions that sequentially engage grooves and protrusions on the inner surface. a rotatable pulley having an outer contoured surface defining grooves and protrusions of the same shape; Combinations of are well known. Each protrusion of the belt structure has two by two substantially straight side edges converging from the apex of the groove to the apex of the protrusion. 0 having a generally V-shaped cross-sectional shape defined, e.g., FIG. 2 of the present application; Adams U.S. Pat. No. 2,728.239, Semin et al. U.S. Pat. No. 3.643 ．． No. 518, U.S. Patent No. 3.951.006 to Fisher et al., U.S. Pat. Patent No. 4.407.4461, Fisher U.S. Patent No. 4.330.28 No. 7, U.S. Pat. No. 4.525.158 to Tanaka et al., and U.S. Pat. No. 4.64 to Hull. See No. 7.278.

Also known is a belt structure having side edges forming an included angle of 60". Such a belt structure includes a plurality of Vs each having opposite side edges forming an included angle of approximately 60°. Cutting from a belt sleeve (sleeve-shaped belt body) that has a letter-shaped protrusion This was obtained by

See, for example, Haynes, U.S. Pat. No. 3,138,962, Russ et al., U.S. Pat. See No. 200.180.

Brother "LΩ" L One feature of the present invention is that the included angle of both side edges of each V-shaped rib is approximately 40° compared to the conventional pulleys in a manner that overcomes some of the many problems associated with belt structures. A novel endless power transmission belt structure having a ribbed inner surface cooperating with an outer circumferential ribbed surface of It's about giving your body.

In particular, according to the teaching of the present invention, the included angle of both side edges of the V-shaped rib is approximately 40°. While maintaining the same thickness as the previous belt structure, the included angles on both sides of the V-shaped ribs were slightly reduced. By setting it to about 60@, the belt noise (operating noise) is reduced and the rib and The accumulation of material between the ribs is suppressed and the drive system without belt tensioning device is It has been found that the tension decay of the belt structure is suppressed when the belt structure is used in a fixed position.

Furthermore, in combination with such a belt structure of the present invention, it can be adapted to fit the ribs of the body. It was accepted that there is no harm in making changes.

For example, in one embodiment of the present invention, the outside of the rotatable pulley may have opposed opposite edges. a plurality of alternatingly spaced longitudinally extending identical shapes for interlocking with surrounding surfaces An endless power transmission belt structure having an inner surface defining a protrusion and a groove. Applicable Each protrusion of the belt structure extends from the apex of the two grooves on both sides of the protrusion to the apex of the protrusion. a generally V-shaped section defined by two substantially straight side edges converging to a point It has a planar shape, and both side edges of each protrusion of the belt structure have an included angle of approximately 60°. The thickness of the belt structure is similar to that of a similar structure in which the included angle is approximately 40°. The thickness should be the same as the belt structure, and the center line of the two grooves on both sides of each protrusion should be The distance between the Features. Therefore, it is an object of the present invention to achieve the above-mentioned or hereinafter-described novel By providing a novel endless power transmission belt structure having one or more of the following features: be.

Another object of the present invention is a method of manufacturing such an endless power transmission belt structure, comprising: , a method having one or more of the novel features of the invention described above or below. The goal is to provide the following.

Another object of the invention is to provide one or more of the novel features of the invention as mentioned above or as hereinafter mentioned. Another object of the present invention is to provide a novel rotatable pulley having more than one A method for producing a method comprising one or more of the above-mentioned or below-mentioned novel features of the present invention. is to provide a method that has more than that.

Another object of the invention is to provide one or more of the novel features of the invention as mentioned above or as hereinafter mentioned. A new combination of an endless power transmission belt structure and a rotatable pulley, which has more than It is to provide.

Another object of the invention is a method for manufacturing such a combination, comprising: or provide a method having one or more of the novel features of the invention described below. That is.

Brief description of the drawing The features of the invention and its technical advantages are further described in the following description of the preferred embodiments, as well as in the patents. As can be understood from the claims and the accompanying drawings.

Figure 1 shows the drive pulley of an automobile engine and the combination of engine accessories. An engine having an endless power transmission belt structure arranged in driving relation to several pulleys. FIG. 3 is a front perspective view of the gin.

Figure 2 shows an enlarged horizontal view of a belt structure with a conventional V-shaped lip cooperating with a pulley. FIG.

FIG. 3 is a view similar to FIG. 2, but with the novel belt structure and pulley of the present invention. - indicates.

Figure 4 is a view similar to Figure 3, but with ribs cooperating with the unribbed surface of the pulley. 1 shows a belt structure of the present invention having a blank surface.

Figure 5 is a view similar to Figure 3, but with fewer V ribs than the belt structure of Figure 3. A belt structure of another embodiment of the present invention having a large V-rib and a belt structure of another embodiment of the present invention A combination of pulleys is shown.

Preferred way to write a book Various features of the invention are described herein, particularly for use in internal combustion engines. Illustrated and explained as applied to constructing a root structure and a pulley. However, features of the invention may be useful in constructing belt structures and pulleys for other types of equipment. It will be clear that they can be used alone or in combination to achieve the desired results.

Accordingly, the attached drawings are merely illustrative of one of the wide range of uses of the invention. Therefore, the present invention should not be limited to the embodiments shown in the accompanying drawings. There isn't.

To explain with reference to FIGS. 1 and 3, the endless power transmission belt structure of the present invention has the reference number 20, and Fig. 1 shows a suitable vehicle such as an automobile (Fig. Sheaves or pulleys 21.2 of the internal combustion engine 26 accessories (not shown) 2.23.24.25. Inside The combustion engine has a drive sheave or pulley 27 connected to its crankshaft. The drive pulley cooperates with the belt structure 20 to move the belt structure 20 in FIG. is driven in the direction shown by arrow 28. The engine 26 is of a type well known in the art. For example, a tensioning device 29 is provided for tensioning the belt structure 20 in a similar manner. U.S. Pat. No. 4,784°631 discloses a belt structure 20 of the present invention in a similar manner. Internal combustion engine using an endless power transmission belt structure and the tensioning device of FIG. discloses a tensioning device similar to No. 29.

As shown in FIG. 3, the belt structure 20 of the present invention consists of parallel pairs of flat having side edges 32,33 and an outer surface 30 and an inner surface 31 extending therebetween; , an inner compression section 34, an outer tension section 35, and a cord 3, all of which are well known in the art. 7 of any suitable materials known in the art to construct the intermediate tensile section 36 in any suitable manner known in the art. For example, a belt similar to the belt structure 20 of the present invention Adams, U.S. Pat. No. 2,728,239, in which Semin et al. U.S. Patent No. 3,643.518, U.S. Patent No. 3.951.0 to Fisher et al. No. 06, Spear U.S. Pat. No. 4.407.4461. Fisher's US special No. 4.330.287, Tanaka et al. U.S. Pat. No. 4.525.158 and Hull No. 4,647.278.

Thus, by the inner surface as shown in FIG. 3 or by the inner surface as shown in FIG. Endless transmission belt for driving the pulley of an automobile engine by its outer surface The structure of the structure, its materials, and the details of its manufacturing method are well known in the industry, so only one The inventive belt structure 20 will be explained in more detail as necessary to understand the unique features of the invention. Only the details will be explained below.

As shown in FIG. 3, the inner surface 31 of the belt structure 20 is In a known manner, rotatable pulleys such as pulleys 21-27 as shown in FIG. a plurality of alternating grooves adapted to engage and drive relationship with the outer circumferential grooved surface 40 of the lee; Parallel protrusions 38 and 39 of the same shape are separated from each other and extended in the elongated direction. In addition, the outer circumferential grooved surface 40 of the pulley 41 also fits around the outer circumference 39 and protrusions of the belt structure 20. A plurality of parallel protrusions of the same shape that are alternately spaced apart and extend in the elongated direction, meshing with 38. 42 and a groove 43 are defined.

Each of the protrusions 38 of the belt structure 20 of the present invention, as shown in FIG. From the apex 45 of the two grooves 39 of the belt structure 20 on both sides of the protrusion 38 A generally defined by two substantially straight side edges 44 converging to an apex 46 It has a V-shaped cross-sectional shape, and both side edges 44 of each protrusion 38 of the belt structure 20 form an included angle A of approximately 60°, and the thickness T of the belt structure 20 is equal to the included angle is approximately 40 degrees, and has the same thickness as a belt structure of a similar structure, with both sides of the protrusion 38 The distance P between the two center lines CL on the side and the center line CL of the similar structure is Make such a distance of the belt structure larger.

Furthermore, the depth D of the grooves 39 of the belt structure 20 is greater than that of belt structures with a similar structure. to be substantially the same depth as .

To explain with reference to FIG. 2, FIG. 2 shows a conventionally well-known V-ribbed belt structure. 20', and similar parts to the belt structure 20 of the present invention are designated by the same reference numeral 20'. The reference number is indicated with '' added to the reference number.

As shown in FIG. 2, the conventionally known V-ribbed belt structure 20' has each protrusion 3 Formed so that the included angle A' defined between the flat convergent side edges of 8' is approximately 40@ has been done. The number of protrusions 38' of such a belt structure 20' can be determined as desired. However, when used in automobiles, any number from three to eight may be used. The thickness T' of the belt structure 20' is approximately 0.523 cm (0, 206 inches), and the depth D' of the valley groove 39' is approximately 0.241 cm (0,0 95 inches), and the center line CL' passing through the apex 45' of the adjacent groove 39' and CL The distance P' between ' is approximately 0.356 cm (0,140 in).

In contrast, according to the teachings of the present invention, the thickness T of the belt structure 20 and the depth of the grooves D may be substantially the same as the conventional belt structure 20', but with the inclusion of protrusion 38. Angle A should be approximately 60° and distance P should be greater than distance P'.

In the case of the belt of the present invention obtained thereby, compared to the conventional belt structure 20', A pulley 41 of the present invention which exhibits much superior performance is shown in FIG. As shown in FIG. 42 and a groove 43, and both side edges of each protrusion 42 of the pulley 41 converge. The included angle of 47 is also approximately 60°. Both side edges 47 of each protrusion 42 are The apexes 48 of the grooves 43 on both sides of the portion 42 converge to the apex 49 of the protrusion 42 .

Thus, in one embodiment of the belt structure 20 of the present invention, the thickness T is approximately 0.523 cm (0,206 inch), and the depth D of the valley groove 39' is approximately 0.241 cm. (0°095 inch), whereas the apex center lines CL and C of adjacent grooves 39 The distance MP between L is approximately 0.432 cm (0.170 in).

With this configuration, the belt structure 20 of the present invention is similar to the conventional belt structure 20. 'The noise during operation with the pulley is smaller than that of the conventional belt structure 20'. Therefore, there is less accumulation of material between the ribs or protrusions 38, and the belt tensioning device is Compared to conventional belt structures 20', when used with drives that do not have The degree of attenuation is small.

The reason why the belt structure 20 of the present invention has the above advantages is that the deflection characteristics of the belt are The belt thickness T and grooves are adjusted to be substantially the same as that of the belt structure 20'. While keeping the depth D of 39 the same as the conventional belt structure 20', the included angle A of the ribs is (and increase the radius of curvature of the root or apex 45 of each protrusion 38, and This is thought to be due to the increase in the pitch P.

For example, in one embodiment of the belt structure 20 of the present invention shown in FIG. The apex 45 of the groove 39 has a radius of curvature of approximately 0.048 cm (0,019 in). The apex 46 of each protrusion 38 is approximately 0.084 cm (0,0 33i n). In contrast, conventional belts The apex 45' of the valley groove 39' of the structure 20' is 0.030 cm (0,012 in. ) is defined by the radius of curvature.

As can be seen from the above description, according to the teachings of the present invention, the conventional 40° included angle rib While maintaining the basic dimensions of the belt structure provided, the pitch or distance P is increased (and the groove 3 By increasing the radius of curvature to define the 9 vertices, Reduces the degree of attenuation of tension in the center drive, making the drive device more sensitive to center runout. It is possible to form a rib 38 that is more rigid than a rib with a 40° included angle. Ru. Since the cause of noise is vibration, the ribbed belt structure with an angle of 60° of the present invention It is natural that the operation noise is quieter than the ribbed belt structure with a 40° included angle. It will be considered.

Furthermore, the wide rib pitch P of the belt structure of the present invention allows the number of grooves per constant belt width to be reduced. As a result, the material of each tooth 38 enters the root 45 of the tooth 38. The belt structure 20 of the present invention has a large radius of curvature at the base 45. The task of cleaning becomes much easier.

For example, if the belt structure 20 of the present invention has five 60@included angle slots 138, dimension, the belt structure includes six 40° included ribs 38. ' can be used in place of the conventional belt structure 20'. because, Such a belt structure 20 has a diameter of approximately 2.159 cm (0,850 in). Such a conventional belt structure 20' has a width of approximately 2.134 cm (0.8 cm). This is because it has a width of 40 inches). Similarly, four 60@included ribs The belt structure 20 of the present invention having a diameter of 38 mm is approximately 1.727 cm (0,680 approximately 1.77 in. and having five 40° included ribs 38'. Instead of a conventional belt structure 20' of similar construction with a width of 8 cm (0,700 in) It can be used in different ways. Furthermore, the present invention has three ribs 38 with an included angle of 60°. The belt structure 20 has a width of approximately 1.295 cm (0,510 in). approximately 1.778 cm (0,700 cm) with four 40" included angle ribs 38'. can be used in place of a conventional belt structure 20' having a width of 1 in).

Therefore, the Rubber Manufacturers Association's Engineering Standard IP-26 (1977) Standard ■Lip with cross section H, J, L or M as described on page 4 Any belt may be adapted to the present invention to provide the improved functionality described above. Can be modified according to the teachings.

As previously mentioned, a novel pulley for cooperating with the belt structure 20 of the present invention It is also a feature of the present invention to provide such a novel pulley, as shown in FIG. The pulley 41 is as shown, and the included angle of the adjacent side edges 47 of each protrusion 42 is: As mentioned earlier, it is approximately 60''. The apex 49 of each protrusion 42 of the pulley 41 is is defined by a radius of curvature of approximately 0°076cm (0,030in), and its The apex 48 of the valley groove 43 has a radius of curvature of approximately 0.051 cm (0,020 inch). It is defined as.

Such a pulley 41 of the present invention has a large radius of curvature and a small number of ribs. This makes it possible to perform precision manufacturing by rotary rolling, which makes it possible to perform precision manufacturing using rotary rolling. The manufacturing cost can be reduced compared to the pulley 41' for the bolt structure 20'. can.

The distance P of the belt structure 20 is approximately 0.432 cm (0.170 in. ), the outer projections 3 defining the side edges 32,33 of the belt structure 20 8 is 1. In order to properly fit the belt structure 20 to the pulley 41. outermost From the center line CL of the groove 39 adjacent to the protrusion 38 to the respective side edge 32 or 33 Trimmed so that the distance is approximately 0°386cm (0,152in) There is. Such trimming to define the side edges 32.33, which are , a technique well known to those skilled in the art.

Further, the belt structure 20 of the present invention described above has five protrusions 38; The protrusions 38 on the belt structure 20 can be of any desired number and cooperate with each other. The pulley 41 of the present invention has a number of protrusions 43 and protrusions 42 corresponding to the number of protrusions. For example, the belt structure 20 shown in FIG. The pulley 41 has two protrusions 42.

Therefore, in addition to providing a new belt structure and a pulley therefor, We provide combinations of belt structures and pulleys, as well as methods of manufacturing them. Ru.

Although preferred embodiments and methods of the present invention have been described above, other embodiments and methods of the present invention have been described. It is understood that method steps may also be used and are encompassed within the scope of the claims. I want to be understood.

FIG 1 FIG.4 FIG.5 Copy and translation of written amendment) Submission form (Document pursuant to the provisions of Article 184-7, Paragraph 1 of the Patent Law) August 20, 1991

Claims (1)

[Claims] 1. having opposed side edges (32, 33) and a plurality of alternatingly spaced longitudinally extending edges; an inner surface (31) defining an elongated, identically shaped projection (38) and a groove (39); an endless power transmission belt structure (20), and an inner surface (31) of the belt structure (20). ) and the protrusion (38) and groove (39) of the belt structure (20). a plurality of alternatingly spaced longitudinally extending identical parts having sequentially interlocking portions; a peripheral ribbed surface (40) defining a protrusion (42) and a groove (43) of the same shape; In the combination with the rotatable pulley (41), each of the belt structures (20) The protrusion (38) is located at the apex (45) of the two grooves (39) on both sides of the protrusion (38). ) two substantially straight lateral lines (44) converging to the apex (46) of the protrusion; has a generally V-shaped cross-sectional shape defined by The included angle (A) of the both side edges (44) of each protrusion (38) of the belt structure (20) is The thickness (T) of the belt structure (20) is approximately 60°, and the thickness (T) of the belt structure (20) is the included angle of both side edges of each protrusion. substantially the same thickness as a conventional belt structure with a similar structure in which the angle is approximately 40°, The center line of the two grooves (39) on either side of the protrusion (38) of the belt structure (20) (CL) and the center line (C) of the belt structure of the same structure. A combination body characterized by having a distance larger than that of . 2. The depth (D) of each groove (39) of the belt structure (20) is similar to the structure described above. of a claim characterized in that the depth of the groove is substantially the same as that of a conventional belt structure of The combination according to scope 1. 3. The thickness (T) of the belt structure (20) is approximately 0.523 cm (0.20 cm). 6 inches), and the distance (P) between the center lines (CL) is approximately The depth (D) of the groove (39) is approximately 0.432 cm (0.170 inch). Claim 2, characterized in that it is approximately 0.241 cm (0.095 in). Combinations described in section. 4. The apex (46) of each protrusion (38) of the belt structure (20) has a convex shape. and is defined by a radius of curvature of approximately 0.084 cm (0.033 in). The apex (45) of each groove (39) of the belt structure (20) has a concave shape. is defined by a radius of curvature of approximately 0.048 cm (0.019 in). The combination according to claim 3, characterized in that: 5. The protrusion (42) and groove (43) of the pulley (41) are connected to the belt structure. It should be noted that it has approximately the same dimensions as the protrusion (38) and groove (39) of the structure (20). A combination according to claim 1, characterized in that: 6. The apex (49) of each protrusion (42) of the pulley (41) is convex. , defined by a radius of curvature of approximately 0.076 cm (0.030 in), and the pool The apex (48) of each groove (43) of the lee (41) is concave and approximately 0.05 characterized by being defined by a radius of curvature of 1 cm (0.020 in) The combination according to claim 5. 7. It has opposite side edges (32, 33) and the outer periphery of the rotatable pulley (41). a plurality of alternatingly spaced, longitudinally extending parallel plates for mating with the barbed surface (40); An endless transmission having an inner surface (31) defining a protrusion (38) and a groove (39) of the same shape. A moving belt structure (20), each protrusion (38) of the belt structure (20) , from the apex (45) of the two grooves (39) on both sides of the protrusion (38). defined by two substantially straight lateral lines (44) converging to an apex (46); It has an almost V-shaped cross-sectional shape, The included angle (A) of the both side edges (44) of each protrusion (38) of the belt structure (20) is The thickness (T) of the belt structure (20) is approximately 60°, and the thickness (T) of the belt structure (20) is the included angle of both side edges of each protrusion. substantially the same thickness as a conventional belt structure with a similar structure in which the angle is approximately 40°, The center line of the two grooves (39) on either side of the protrusion (38) of the belt structure (20) (CL) and the center line (CL) of the belt structure of the same structure. An endless power transmission belt structure characterized by having a distance greater than . 8. The depth (D) of each groove (39) of the belt structure (20) is the same as that of the same structure as described above. Claims characterized in that the groove depth is substantially the same as that of conventional belt structures. The endless power transmission belt structure according to scope 7. 9. The thickness (T) of the belt structure (20) is approximately 0.523 cm (0.206 cm). in), and the distance (P) between the center lines (CL) is approximately 0432 cm (0.170 inch), and the depth (D) of the groove (39) is approximately 0.241 cm (0.095 inch) The described endless power transmission belt structure. 10. The apex (46) of each protrusion (38) of the belt structure (20) has a convex shape. and is defined by a radius of curvature of approximately 0.084 cm (0.033 in). The apex (45) of each groove (39) of the belt structure (20) has a concave shape. is defined by a radius of curvature of approximately 0.048 cm (0019 in). The endless power transmission belt structure according to claim 9. 11. To engage with the ribbed inner surface (31) of the endless power transmission belt structure (20) a rotatable pulley (41) having an outer peripheral ribbed surface (40), the outer peripheral ribbed surface (40) The ribbed surface (40) includes a plurality of alternately spaced longitudinally extending protrusions of the same shape. (42) and a groove (43), each protrusion (42) having a Convergence from the apex (48) of the two side grooves (43) to the apex (49) of the protrusion a generally V-shaped cross-sectional shape defined by two substantially straight lateral lines (47); It has a The included angle of the both side edges (47) of each protrusion (42) of the pulley (41) is approximately 60°. and the height of the protrusion (42) is approximately 0.241 cm (0.095 inch). The pitch of the protrusions (42) is approximately 0.432 cm (0.170 inch). Signature pulley. 12. a plurality of alternatingly spaced longitudinally extending identical shapes having opposite edges an endless power transmission belt structure having an inner surface defining a protrusion and a groove; meshes with a portion of the inner surface of the belt structure, and sequentially meshes with the protrusions and grooves of the belt structure. a plurality of alternatingly spaced longitudinally extending protrusions of the same shape having portions for and a rotatable pulley having a peripheral ribbed surface defining a groove. In the method of defined by two substantially straight side edges converging from the apex of the protrusion to the apex of the protrusion; A method for manufacturing the combination including a step of forming the assembly into a substantially V-shaped cross-sectional shape. The method is such that the both edges of each protrusion of the belt structure have an included angle of approximately 60°. The thickness of the belt structure is such that the included angle of the edges of both sides of each protrusion is approximately It has substantially the same thickness as a conventional belt structure of similar construction which is tilted at approximately 40 degrees. , the distance between the center lines of the two grooves on both sides of the protrusion of the belt structure is formed to be greater than such distance of a belt structure of similar construction; A method for manufacturing a combination body characterized by: 13. The depth of each groove of the belt structure is greater than that of a conventional belt structure having a similar structure as described above. The depth of the groove is substantially the same as the depth of the groove in claim 1. The method for producing the combination according to item 12. 14. the belt structure has a thickness of approximately 0.523 cm (0.206 in); The distance between the center lines is approximately 0.432 cm (0.170 inch); The groove may be formed to have a depth of approximately 0.241 cm (0.095 inch). The method for producing a combination according to claim 13, characterized in that: 15. The apex of each protrusion of the belt structure has a convex shape and is approximately 0.084 cm. (0.033 in) of the belt structure. The apex of each groove is concave, with a radius of curvature of approximately 0.048 cm (0.019 in). According to claim 14, the device is formed to be defined by: Combination manufacturing method. 16. The protrusions and grooves of the pulley are approximately the same as the protrusions and grooves of the belt structure. The set according to claim 15, characterized in that the set is formed to have the same dimensions. Combined body manufacturing method. 17. The apex of each protrusion of the pulley has a convex shape and has a height of approximately 0.076 cm (0.076 cm). 030 inches) of each groove of the pulley. The apex is concave and has a radius of curvature of approximately 0.051 cm (0.020 in). The combination according to claim 16, characterized in that it is formed as defined by: Body manufacturing method. 18. It has opposing edges on both sides and is designed to engage with the outer ribbed surface of the rotatable pulley. an inner surface defining a plurality of alternately spaced longitudinally extending projections and grooves of the same shape; In a method of manufacturing an endless power transmission belt structure having a side surface, the belt structure has a Each protrusion converges from the apex of the two grooves on both sides of the protrusion to the apex of the protrusion. has a generally V-shaped cross-sectional shape defined by two substantially straight side lines. The belt structure manufacturing method includes a step of forming a The side edges of each protrusion of the belt structure are arranged such that an included angle thereof defines approximately 60°. and the thickness of the belt structure is such that the included angle of both side edges of each protrusion is approximately 40°. The belt structure has substantially the same thickness as a conventional belt structure of similar construction. The distance between the center lines of the two grooves on both sides of the protrusion of the structure is the same as that of the similar structure. characterized by forming the belt structure to be larger than such distance; A method for manufacturing an endless power transmission belt structure. 19. The depth of each groove of the belt structure is greater than that of a conventional belt structure having a similar structure as described above. The depth of the groove is substantially the same as the depth of the groove in claim 1. The method for manufacturing an endless power transmission belt structure according to item 18. 20. the belt structure has a thickness of approximately 0.523 cm (0.206 in); The distance between the center lines is approximately 0.432 cm (0.170 inch); The groove may be formed to have a depth of approximately 0.241 cm (0.095 inch). The endless power transmission belt structure manufacturing method according to claim 19, characterized in that: 21. The apex of each protrusion of the belt structure has a convex shape and is approximately 0.084 cm. (0.033 in), the belt structure is defined by a radius of curvature of The apex of each groove on the body is concave, with a half-curvature of approximately 0.048 cm (0.019 in). Claim 20, characterized in that it is formed so as to be defined by a diameter. A method for manufacturing an endless power transmission belt structure. 22. An outer circumferential ribbed surface for mating with the ribbed inner surface of the endless power transmission belt structure. and the peripheral ribbed surface has a plurality of alternatingly spaced longitudinally extending identical shapes. defining protrusions and grooves, each protrusion extending from the apex of the two grooves on both sides of the protrusion; approximately defined by two substantially straight side edges converging to the apex of the protrusion; A pulley manufacturing method for manufacturing a rotatable pulley having a V-shaped cross section. There it is, The both side edges of each protrusion of the pulley are formed so that the included angle thereof is approximately 60°. , the height of the protrusion is approximately 0.241 cm (0.095 inch), and the pitch of the protrusion is approximately 0.241 cm (0.095 inch). is approximately 0.432 cm (0.170 inch). Pulley manufacturing method.