JPH109345A - V-ribbed belt and manufacture the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of a stick-slip noise, by orientating and embedding short fiber in a belt flat surface and in a vertical direction at the rib end of a V-ribbed belt, projecting a part of the short fiber from a rib bottom surface, and also orientating and embedding the short fiber in a direction approximately perpendicular to a belt longitudinal direction in the remaining rib main body. SOLUTION: In a V-ribbed belt 1, a tensile body 2 formed of a rope having low ductility and high strength, is embedded in a bonded rubber layer 3, and a sail cloth 4 with rubber is laminated and stuck bias on the upper surface of this bonded rubber layer 3. A plurality of V-shaped ribs 5 is formed in parallel with a belt longitudinal direction on the lower surface of the bonded rubber layer 3. In this case, a short fiber 7 formed of a synthetic fiber and the like is embedded in a rib end 6 while keeping orientation to a belt flat surface and a vertical direction. While, a homogeneous short fiber 9 is embedded in the remaining rib main body 8 except for the rib end 6 having orientation approximately perpendicular to the belt longitudinal direction. At this time, the height of the rib end 6 is set in a range of from 10 to 30% at the height of the whole rib.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-ribbed belt and a method for manufacturing the same, and more particularly to a V-ribbed belt having a short fiber group embedded in a V-rib portion for use in general industries, automobiles, agricultural equipment, and home appliances. The present invention relates to a belt manufacturing method.

[0002]

2. Description of the Related Art A V-ribbed belt is mounted on a pulley having a plurality of annular V-shaped grooves formed on a peripheral surface thereof, and performs power transmission by a frictional force between a belt V-rib group and a V-shaped groove of the pulley. ing. In order to improve the lateral pressure resistance of the belt V-rib portion and to reinforce the V-rib portion, a V-ribbed belt in which short fibers are buried in the V-rib portion while maintaining the orientation in a direction substantially perpendicular to the belt longitudinal direction. Widely known. Aramid fibers (aromatic polyamide fibers) having excellent wear resistance and lateral pressure resistance are used as the short fibers.
No. 6,086,045.

[0003]

A V-ribbed belt in which short fibers are oriented and embedded in the V-rib portion in the width direction of the belt,
In many cases, this belt is mounted on a flat pulley as a flat belt and run for power transmission. In this case, the short fibers located near the tip of the V-rib tend to fall off from the surface of the V-rib when the belt, particularly the belt rib, is polished. Therefore, it is difficult to expose a sufficient amount of the short fibers to the belt V-rib. Therefore, the frictional force with the flat pulley, that is, the power transmission force, is increased by this amount, and when the belt slips, a large harmful noise, that is, a stick-slip noise is generated.

The present invention is not limited to a V-ribbed belt in which a V-rib portion is fitted to a V-groove pulley in which a plurality of V-shaped grooves are formed in a circumferential direction. It is an object of the present invention to provide a V-ribbed belt that can minimize the generation of the stick-slip sound even when used as a belt.

[0005]

According to a first aspect of the present invention, there is provided a V-ribbed belt comprising a plurality of rib groups extending parallel to a longitudinal direction of a belt on a lower surface of a belt body. A short fiber is buried at the rib tip in a direction substantially perpendicular to the plane of the belt, and a part of the short fiber is projected from the bottom of the rib. (Embedded in the same direction), and a rib portion having a two-layer structure with different directions of buried short fibers, a part of which protrudes from the side surface of the rib, is formed. The rib tip in which short fibers are oriented and buried in the direction perpendicular to the belt plane has a rib height of 10 to 30.
% Is set in the range.

According to a third aspect of the present invention, there is provided a method of manufacturing a V-ribbed belt, wherein a plurality of single elastic sheets each having short fibers oriented and embedded in the elastic sheet in the longitudinal direction of the sheet are laminated and adhered in the same direction. To form an elastic sheet laminate, cut the sheet laminate in the vertical direction with a predetermined length, rotate 90 ° and sequentially join in a state where the short fibers are in a direction perpendicular to the plane. After forming a reinforced elastic sheet, after sequentially winding an elastic sheet in which a canvas with rubber, adhesive rubber, tensile rope, adhesive rubber and short fibers are oriented and embedded in the width direction on the peripheral surface of the cylindrical forming drum. Then, the reinforcing elastic sheet is laminated and adhered to form a cylindrical unvulcanized laminate, and then a wide flat belt-shaped vulcanized sleeve vulcanized by a known pressure heating means is polished and cut. A V-ribbed belt having V-shaped ribs is formed.

Next, a specific embodiment of the V-ribbed belt according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a part of a V-ribbed belt according to the present invention. In FIG.
A flat belt formed by embedding a tensile member 2 made of a low-stretch, high-strength rope such as an aromatic polyamide fiber in a single material such as NR, SBR, or CR or an adhesive rubber layer 3 obtained by appropriately blending them. On the upper surface of the adhesive rubber layer 3, a canvas 4 with rubber woven with warp yarn is biased,
At least one sheet is laminated and attached.

On the lower surface of the adhesive rubber layer 3, a plurality of V-shaped ribs 5 forming a V-shaped compression layer of the same material as the adhesive rubber layer 3 are formed in parallel with the longitudinal direction of the belt. By making the orientation of the short fibers 7 and 9 embedded in the rib portions different, a two-layer structure is created. That is, a synthetic fiber such as nylon, vinylon, polyester, or aromatic polyamide is provided at the tip of the V-shaped rib 5, more specifically, at the rib tip 6 formed at the thickness of the entire V-shaped rib.
Alternatively, short fibers 7 having a length of 3 to 10 mm, which are made of a mixed yarn of cotton, pulp and the above synthetic fibers, have an orientation in a direction perpendicular to the belt plane in a ratio of 5 to 30 parts by weight with respect to 100 parts by weight of rubber. It is kept and buried.

On the other hand, the remaining rib body 8 except for the tip 6 of the V-shaped rib 5 is provided with short fibers 9 of the same quality as the short fibers in a ratio of 5 to 30 parts by weight with respect to 100 parts by weight of rubber. The V-shaped rib 5 has a two-layer structure in which the orientation of the embedded short fibers is different from that of the belt in the longitudinal direction of the belt. I have.

FIG. 2 is an enlarged sectional view of the V-shaped rib portion 5 of FIG. 1. The two-layer structure of the rib portion is constituted by a tip portion 6 and a remaining main body portion 8, When the height of the tip 6 is h and the height of the entire rib is H, the height h of the tip is
Is set in the range of (0.1-0.3) H.

The short fibers 7 buried vertically in the tip portions 6 of the V-shaped ribs 5 are partially protruded from the bottom surfaces of the ribs by grinding with a grinder wheel when the ribs are formed. The coefficient of friction at the tip of the rib is reduced. The short fibers 9 embedded in the main body portion 8 of the V-shaped rib 5 in the belt width direction have a part thereof projected to the side surface of the rib by polishing a grinder wheel when forming the rib.

When the height h of the tip portion 6 of the rib portion 5 of the belt is less than 0.1H, the embedded portion of the short fiber 7 in the rib rubber which supports the protruding short fiber at the rib tip portion 6 becomes too short. The protruding short fibers are likely to fall off. on the other hand,
When the height h of the rib tip is 0.3H or more, the number of ribs having short fibers buried vertically in the side surface of the rib groove in contact with the rib pulley is reduced, and the wear resistance is reduced.

Next, a method for manufacturing a V-ribbed belt according to the present invention will be described. FIG. 3 shows a single elastic sheet 10 in which the short fiber group 13 is substantially uniformly oriented and mixed in the longitudinal direction of the belt-like sheet and parallel to the sheet surface. It is obtained by mixing short fibers 13 in the vulcanized elastic body 12 in a sheet longitudinal direction by a known means such as a roll or an extruder.

Next, as shown in FIG. 4, a plurality of the single elastic sheets 10 (four in FIG. 4) are laminated and adhered in the same row direction to form an elastic sheet laminate 14. . The elastic sheet laminate 14 is vertically cut at a predetermined interval (thicker than the dimension of the rib tip h) to form a strip-shaped small piece 11, and the short fiber 13 is rotated by 90 ° in either of the left and right directions to form the short fiber 13. The reinforcing elastic sheet in which the short fibers 13 are vertically oriented with respect to the sheet surface by sequentially joining in a state where the short fibers 13 are oriented perpendicular to the sheet surface in such a manner that the cut surfaces of the strips are positioned on the upper and lower surfaces of the sheet. Get 15.

FIG. 6 is a partial cross-sectional view showing a manufacturing process of a vulcanized sleeve using the above-mentioned reinforcing elastic sheet 15. One or more sheets are wound in the longitudinal direction of the belt, and then an upper adhesive rubber 3 ', a low elongation high-strength tensile rope 2 and a lower adhesive rubber 3 "are sequentially wound. An elastic rubber sheet 16 having a large thickness and short fibers 13 oriented and buried in the lateral direction is laminated, and the thickness is thinner than the elastic rubber sheet described above, and the short fibers 13 are buried in a direction perpendicular to the plane. Elastic sheet 15
Are laminated to form a cylindrical unvulcanized laminate.

The unvulcanized laminate is vulcanized by a known pressurizing and heating means and has a wide flat belt-shaped vulcanization sleeve 20.
Get. The vulcanized sleeve 20 is removed from the forming drum D, and is transferred to a polishing cutting process. In the polishing and cutting step, the polishing wheel is set to high speed polishing from the beginning to a position within the range of 0.1 to 1.0 mm of the final polishing depth, and the remaining 0.1
From 1.0 mm to the end, two-stage polishing is performed in which the polishing wheel is polished at a low speed. Thus, the V-ribbed belt shown in FIG. 1 is obtained.

[0017]

As described above, in the V-ribbed belt according to the present invention, the short fibers are buried in the V-rib portion at the tip of the rib in the direction perpendicular to the belt plane, and a part thereof is projected from the rib bottom surface. In the remaining rib body, short fibers are oriented and embedded in the belt width direction substantially perpendicular to the belt longitudinal direction, and a part of the short fibers is projected from the rib side surface from a two-layer structure with different orientation directions of embedded short fibers. By forming a rib portion of
In addition to the original use of fitting it to the grooved pulley, of course, even when used as a flat belt mounted on a flat pulley, the short fibers protruding between the V-ribbed belt and the pulley are interposed,
When slippage occurs between the flat pulley and the V-ribbed belt at the time of overload, the slippage is smoothly performed, which has an effect of preventing generation of stick slip noise.

Further, the method of manufacturing a V-ribbed belt according to the present invention utilizes the relatively easy point of embedment of short fibers in the elastic sheet in the longitudinal direction thereof, and makes this sheet into a sheet-like small piece group again. By cutting vertically from the surface and forming the upper and lower surfaces of the target sheet again with each cutting section of the band-shaped small piece group, it is possible to easily and easily use the reinforcing elastic sheet in which the short fiber group is embedded in the vertical direction. Thus, a V-ribbed belt is obtained in which short fibers are buried at the rib tip in the direction perpendicular to the belt plane.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a double V-ribbed belt according to the present invention.

FIG. 2 is an enlarged partial sectional view showing a rib portion of FIG. 1;

FIG. 3 is a partial perspective view of a single elastic sheet.

FIG. 4 is a partial perspective view of an elastic sheet in which a single elastic sheet is laminated.

FIG. 5 is a perspective view of a reinforcing elastic sheet joined by rotating the laminated elastic sheet by 90 °.

FIG. 6 is a partial cross-sectional view illustrating a manufacturing process of a vulcanized sleeve.

[Explanation of symbols]

 Reference Signs List 1 V-ribbed belt 5 V-shaped rib 6 V-shaped rib tip 7 short fiber 8 V-shaped rib main body 9 short fiber 10 single elastic sheet 11 strip-shaped piece 14 elastic sheet laminated body 15 reinforcing elastic sheet 20 vulcanization sleeve

Claims (4)

[Claims] 1. A short fiber is oriented and buried in a direction perpendicular to a belt plane at a tip of a rib of a rib portion of a V-lid belt.
Partially protrudes from the rib bottom, short fibers are buried in the remaining rib body in a direction substantially perpendicular to the belt longitudinal direction, and a part of the short fibers protrudes from the rib side surface. A rib portion having a two-layer structure different from the above. 2. The tip of a rib in which short fibers are oriented and buried in a direction perpendicular to the belt plane is 10 to 30% of the total rib height.
The V-ribbed belt according to claim 1, wherein the V-ribbed belt is set in the range of: 3. A single elastic sheet in which short fibers are oriented and embedded in the longitudinal direction of the sheet in the elastic sheet, and a plurality of the single elastic sheets are laminated and adhered in a manner that the alignment directions coincide with each other to form an elastic sheet laminate.
The sheet laminate is cut vertically with a predetermined length,
After rotating by 90 ° so that the short fibers are perpendicular to the plane, they are sequentially joined to form a reinforced elastic sheet, and then a canvas with rubber, adhesive rubber, tensile strength is formed on the peripheral surface of the cylindrical forming drum. After successively winding the elastic sheet in which the body rope, the adhesive rubber and the short fibers are buried in the width direction, the reinforcing elastic sheet is laminated and adhered to form a cylindrical unvulcanized laminate,
Thereafter, a wide flat belt-shaped vulcanized sleeve vulcanized by a known pressurizing and heating means is polished and cut to form a V-ribbed belt having V-shaped ribs. 4. A rib tip portion in which short fibers are oriented and buried in a direction perpendicular to the belt plane is 10 to 30% of the total rib height.
The method for producing a V-ribbed belt according to claim 3, wherein the range is set in the range of: