JPH07280040A - V-ribbed belt and its manufacture - Google Patents

Abstract

PURPOSE:To improve the wear resistance and the side pressure resistance of a V-ribbed part of one stage by the constant orientation of the short fiber which is embedded in the V-rib and a part of which is projected from the side surface of the V-rib in a V-ribbed belt where a plurality of V-ribs extending in the circumferential direction of the belt are integrated with the lower surface of a tension layer where tension ropes are embedded in a cushion rubber layer. CONSTITUTION:In a V-ribbed belt 1 where a plurality of V-ribs 6 extending in the circumferential direction of the belt are integrated with the lower surface of the tension layer where tension ropes 3 are embedded in a cushion rubber layer 2, the short fiber 5 is embedded in the V-ribs 6, and the projected part of the short fiber 5 projecting from the side surface of the V-ribs 6 is projected from the side surface of the V-ribs while keeping the orientation in the approximately perpendicular direction.

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 in particular, a group of short fibers is embedded in a V-rib portion of a belt which fits into a V-shaped groove portion of a pulley.
More specifically, the present invention relates to a V-ribbed belt in which a part of the embedded short fibers is projected from a side surface of the V-rib, and a method for manufacturing the belt.

[0002]

2. Description of the Related Art In a V-ribbed belt, short fibers are embedded in the V-rib portion for the purpose of abrasion resistance, deformation resistance and durability of the V-rib portion, and the embedded short fibers extend in the belt width direction. Many proposals have been made for V-ribbed belts having a configuration in which the orientation is maintained and a portion of the embedded short fibers is protruded from the side surface of the V-ribs by going one step further (for example, JP-A-62-113).
940). However, the short fibers partially protruding from the side surface of the V-rib are embedded while maintaining the orientation that matches the belt width direction.

[0003]

PROBLEM TO BE SOLVED BY THE INVENTION By making the short fibers protrude from the side surface of the V-rib while maintaining the orientation in the belt width direction, the rigidity of the V-rib portion is increased and the abrasion resistance is improved.
Furthermore, although the effects of suppressing the generation of abnormal noise are certainly recognized, these effects are recognized only in a relatively early stage of belt running in terms of timing.

When this ribbed belt is hung on a pulley with a V groove, the short fiber protruding portion is pressed against the side wall surface of the V groove of the pulley, and the short fiber protruding portion is bent along the side surface of the belt V rib. The short fibers were cut from the bent portions with the lapse of time of running the belt, and the effect of projecting the short fibers themselves could not be expected for a long period of time.

According to the present invention, the projecting portion of the short fiber embedded in the V-rib and projecting a part thereof from the side surface of the V-rib does not cause the V-ribbed belt to be hung on the V-grooved pulley and is not bent for a long period of time. It is a first object of the present invention to provide a V-ribbed belt capable of maintaining the protruding state of the short fibers for a long period of time and maintaining the wear resistance and durability of the belt for a longer period of time.

Further, the rubber compression layer portion in which the short fiber group constituting a part of the sleeve-shaped belt molding material is embedded is ground by using a grinding wheel in which a mountain-shaped annular grindstone group is raised on the peripheral surface. A second object of the present invention is to provide a simple manufacturing method of a V-ribbed belt, in which a protruding portion of the short fiber from the V-rib side surface can be projected from the V-rib side surface while maintaining an orientation in a substantially vertical direction. And

[0007]

In order to achieve the above object, the V-ribbed belt according to the present invention has the following structure. According to the present invention, a plurality of V ribs extending in the belt circumferential direction are integrally formed on the lower surface of a belt tension layer formed by embedding a tension rope in a cushion rubber layer.
In the ribbed belt, short fibers are embedded in the V-ribs, and of these short fibers, the protruding portions of some short fibers protruding from the V-rib side surface are oriented in a substantially vertical direction from the V-rib side surface. It is characterized by being retained and protruding.

In other words, in the V-ribbed belt that is hung on the V-grooved pulley, among the short fibers embedded in the V-ribs of the belt, the protruding portions of the short fibers protruding from the side surface of the V-rib are , The V-grooved pulley is in contact with the side wall surface of the V-groove in a substantially upright shape.

The short fibers completely embedded in the V-ribs have substantially the same orientation as the protruding short fibers protruding substantially vertically from the V-rib side surface on the side where the short fibers are located close to each other. It is characterized by being buried.

The method of manufacturing the V-ribbed belt according to the present invention has the following construction. The present invention is characterized by sequentially performing the following steps. That is, a. A step of forming a sleeve for forming an unvulcanized belt formed by sequentially laminating an unvulcanized rubber compression layer in which short fibers are embedded with an orientation that matches the sleeve width direction, a tension rope, and an unvulcanized rubber cushion layer,

B. On the compression layer side of the unvulcanized belt molding sleeve, a sleeve-shaped mold member in which a group of mountain-shaped projections extending in parallel with the circumferential direction of the sleeve is provided in parallel is arranged, and the belt molding sleeve and the mold member are provided. By vulcanization molding with pressure contact,
A step of forming a vulcanized belt forming sleeve by forming a group of embedded short fibers together with a mountain shape that is continuous over the entire surface of the compression layer, and inclining the embedded short fiber groups in a continuous c-shape parallel to the mountain surface.

C. For each top of the continuous chevron formed on the compression layer surface of the vulcanized belt-forming sleeve, a V-rib of the belt is formed by grinding the compression layer portion with a grinding wheel in which a group of concentric annular grindstones is raised on the circumferential surface. Along with the formation, a step of projecting short fibers extending in a substantially vertical direction from the side surface of the V-rib, d. A step of cutting a belt-forming sleeve into multiple V-rib units.

[0013] In other words, in the step c through the steps a and b, the compression layer forming the vulcanized belt forming sleeve is formed by the grinding wheel in which the mountain-shaped annular grindstone is raised on the peripheral surface. The grinding is characterized by adopting the step of forming the V-ribs of the belt and carrying out the grinding with the embedded short fibers in a state of being substantially orthogonal to each mountain-shaped annular grindstone surface, which leads to the step d.

The inclination direction and the inclination angle of the chevron projections of the sleeve-shaped member are substantially the same as the orientation direction of the short fibers embedded in the compression layer of the vulcanized belt molding sleeve. .

Further, the shape of the mountain-shaped annular grindstone forming a part of the grinding wheel conforms to the shape of the mountain-shaped annular ridge forming a part of the V-grooved pulley on which the V-ribbed belt is mounted. There is.

Further, the sleeve-shaped mold member is composed of a highly contractible rubber jacket in which a group of chevron-shaped projections are provided in the circumferential direction of the inner peripheral surface.

Alternatively, as the sleeve-shaped mold member,
It is configured by an elastic mother mold made of rubber or urethane resin in which a group of chevron-shaped ridges is raised in the circumferential direction of the outer peripheral surface.

[0018]

The protruding portion of the short fiber protruding substantially vertically from the side surface of the V-rib of the belt hangs the belt on the V-grooved pulley and abuts the V-groove side wall surface of the pulley in a substantially orthogonal manner. The orientation direction of the short fibers and the direction of the lateral pressure by the pulley can be made to coincide with each other, and this action can also be exerted on the short fibers which are completely embedded in the V rib.

[0019]

EXAMPLES Specific examples of the V-ribbed belt according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a V-ribbed belt embodying the present invention. NR. SBR. CR. NB
In the cushion rubber layer (2) made of a single material such as R or a rubber in which these are appropriately blended, a low elongation and a high elongation made of polyester, aliphatic polyamide, aromatic polyamide (trade name Kevlar), glass fiber, or the like. A strong tensile rope (3) is embedded in parallel, and a canvas with rubber (4) is stuck and laminated on the upper surface of the cushion rubber layer (2) when necessary to pull it On the other hand, on the lower surface of the cushion rubber layer (2), a plurality of V ribs having a V-shaped cross section (in which a short fiber (5) is embedded in a rubber layer of the same material as the cushion rubber layer (2) ( 6) extends in parallel in the belt circumferential direction.

Short fibers (5) embedded in the V rib (6)
Is made of cotton, rayon, nylon, aromatic polyamide (trade name Kevlar), etc. with sufficient rigidity and cut into 3-10 mm. The short fiber (5) is projected from the side surface of the rib, and the protruding portion (5A) is projected from the side surface of the V rib (6) while maintaining the orientation in a substantially vertical direction.

The short fibers (5) completely embedded in the V-ribs (6) are substantially the same as the protruding short fibers protruding substantially vertically from the side surface of the V-rib on the side where the short fibers are located close to each other. It is buried while maintaining its orientation.

A specific embodiment of the method for manufacturing a V-ribbed belt according to the present invention will be described with reference to the drawings. FIG. 2 is a partial sectional view orthogonal to the circumferential direction of the sleeve in which a mold member is attached to the circumferential surface of the unvulcanized belt molding sleeve immediately before vulcanization molding. Is wrapped with one to a plurality of layers of canvas with rubber (4), and the NR. SBR. CR. An unvulcanized rubber cushion layer (2A) made of a single material such as NBR or a rubber in which these are appropriately blended, and further polyester, aliphatic polyamide, aromatic polyamide (trade name Kevlar) on the peripheral surface thereof.
Alternatively, a low-strength, high-strength tensile rope (3) made of glass fiber or the like is spirally wound.

A cylindrical drum (1
A short fiber (5) obtained by cutting a fiber filament made of cotton, rayon, nylon, aromatic polyamide or the like, which has a constant orientation matching the axial direction of 1), into 3 to 10 mm,
The unvulcanized rubber sheet (6A) is embedded in the same unvulcanized rubber sheet (6A) as the unvulcanized rubber cushion layer (2A).
A) is lapped over several layers until a predetermined weight is obtained, whereby an unvulcanized rubber compression layer (6B) is formed. The above steps are the steps that are usually adopted in the method of manufacturing the V-ribbed belt.

On the peripheral surface of the rubber compression layer (6B) of the sleeve (13) for molding an unvulcanized rubber belt having the above structure,
In the state where a sleeve-shaped mold member having a high shrinkability, such as a rubber jacket (16), in which mountain-shaped protrusions (15) extending in the circumferential direction are juxtaposed is fitted on the inner peripheral surface, that is, the rubber compression layer side. Then, the unvulcanized belt forming sleeve (13) is heated and pressurized in the vulcanizer using high-pressure steam or the like.

The angled ridges (1) of the rubber jacket (16)
5) is pressed against the surface of the rubber compression layer (6B) so as to bite,
On the rubber compression layer (6C) surface of the vulcanized rubber belt molding sleeve (23), a continuous chevron surface in which peaks (24) and valleys (25) are alternately revealed is formed, and the rubber compression layer is formed. The short fibers (5) group embedded in (6C) are also displaced and inclined and oriented in a continuous C shape parallel to the chevron surface formed on the lower surface of the rubber compression layer (see FIG. 4). That is, the inclination direction and the inclination angle of the chevron ridges (15) of the sleeve-shaped mold member are
The orientation direction and orientation angle of the short fibers (5) embedded in the rubber compression layer of the vulcanized belt molding sleeve (23) are substantially the same.

As a sleeve-shaped member, a rubber compression layer constituting an unvulcanized rubber belt forming sleeve is placed inside the sleeve instead of the rubber jacket (16). It is also possible to use an elastic mother mold made of rubber or urethane resin in which a group of chevron-shaped protrusions is bulged in the circumferential direction on the outer peripheral surface. That is, the mother mold is arranged on the peripheral surface of the cylindrical drum, and the unvulcanized rubber compression layer, the tension rope, the cushion rubber layer, and the rubber are sequentially arranged in the reverse order of the unvulcanized belt forming sleeve. A vulcanized belt molding sleeve is obtained by vulcanization molding with a canvas attached and a general-purpose compression jacket wrapped around the outer peripheral surface. During the grinding operation described later, the belt forming sleeve is used by turning it over.

Vulcanized by setting the inclination angle of the annular ridges (15) formed on the inner peripheral surface of the sleeve-like rubber jacket as the mold member (16) to, for example, 20 °. On the lower surface of the rubber compression layer (6C) of the belt forming sleeve (23), a continuous continuous relative chevron surface with an inclination angle of 20 ° is also formed, and at the same time, the rubber compression layer (6C).
The short fibers (5) in C), which were parallel to the lower surface of the rubber compression layer, are also parallel to the continuous chevron surface of the rubber compression layer (6C) and are alternately inclined with respect to the lower surface of the rubber compression layer. And a continuous C-shaped displacement orientation that maintains the inclination angle of 20 ° is realized.

From the vulcanized rubber belt forming sleeve (23) having a continuous chevron surface formed on the rubber compression layer (6C), the cylindrical drum (11) and the rubber jacket (1) are formed.
6) is removed. And the molding sleeve (23)
Is a pair of drive tubular pulley (31) and driven tubular pulley (3
2) A rubber compression layer (6C) forming a part of the molding sleeve is placed on the surface side and mounted (see FIG. 3).

Corresponding to the circulation running of the belt forming sleeve (23), the rubber compression layer (6C) of the sleeve is
Grinding is performed by pressure contact with a grinding wheel (41) having a mountain-shaped annular grindstone (42) group provided on the circumferential surface.

The mountain-shaped annular grindstone (42) of the grinding wheel (41) is the sleeve (23) for molding the vulcanized belt.
The rubber compression layer (6C) is bulged with a pitch corresponding to the tops of the peaks (24) of the mountain-shaped surface of the rubber compression layer (6C).
The angle of inclination of the chevron surface and the angle of orientation of the embedded short fibers (5) are, for example, 20 ° with respect to the lower surface of the rubber compression layer (6C).
The angle of the top of each chevron-shaped grindstone (42) is set to 40 °, and the top of each chevron-shaped grindstone (42) is set to the top of each chevron of the rubber compression layer (6C). And the grinding operation is executed in accordance with (see FIG. 4). In other words, the mountain-shaped annular grindstone (42) of the grinding wheel (41) performs the grinding operation in a direction orthogonal to the embedded short fibers (5).

Along with the grinding by the mountain-shaped annular grindstone (42) group, V ribs are gradually formed on the compression layer (6C) of the belt forming sleeve (23), and the V ribs (6) are formed on the side surfaces after the grinding is completed. Part of the short fibers (5) protrudes, and by selecting the inclination angle of the embedded short fibers and the top angle of the mountain-shaped annular grindstone, the short fiber protrusions protrude from the side face of the V-rib while maintaining a substantially vertical direction. .

That is, the rubber compression layer (6) of the belt forming sleeve (23) in which the short fibers inclined in a continuous C-shape are embedded.
Grinding with a grinding wheel (41) in which a mountain-shaped annular grindstone (42) group is bulged on the circumferential surface for C), V-ribs of the belt are formed, and the embedded short fibers are substantially orthogonal to each mountain-shaped annular grindstone surface. The protrusion is realized in parallel with grinding.

In terms of actual conditions, the Yamagata annular grindstone (4
The angle of the top of 2) is in the range of 40 ± 5 °, and the half angle of the top is in the range of 20 ± 3 °. The inclined orientation angle of the short fibers (5) embedded in the rubber compression layer (6C) is also in the range of 20 ± 3 ° with respect to the lower surface of the compression layer. In addition, the protruding portion (5) of the short fiber from the side surface of the V-rib (6) of the belt.
The protrusion amount of A) is in the range of 0.05 to 0.3 mm.

The shape of the V-shaped protrusion of the V-grooved pulley on which the V-ribbed belt according to the present invention is fitted matches the shape of the chevron grindstone forming the grinding wheel, and projects from the V-rib side surface of the V-ribbed belt. The short fibers repeatedly come into contact with the side surface of the V-shaped protrusion of the pulley with V groove, that is, the side wall surface of the V groove in a substantially upright state. And in the final process,
The belt-forming sleeve that has undergone the V-rib grinding step is sliced into a plurality of V-rib units to obtain a desired V-ribbed belt.

[0035]

When the V-ribbed belt according to the present invention is hung on a V-grooved pulley, the short fibers protruding from the V-rib side surface of the belt are substantially perpendicular to the side wall surface of the V-groove of the pulley. By contacting and aligning the orientation direction of the short fibers with the direction of the lateral pressure by the pulley, the wear resistance and lateral pressure resistance of the V-rib portion of the belt itself can be improved, and the short fiber It prevents cutting and pulling out, and also prevents the deformation of the belt V rib portion due to the lateral pressure. As a result, the accurate power transmission ability can be maintained, and the generation of abnormal noise can be suppressed for a long time. You can

The short fiber group completely embedded in the V-ribs is also laid on the V-grooved pulley by maintaining the orientation in the direction substantially vertical to the side surface of the V-rib of the belt. The V rib portion of the V-ribbed belt is
With respect to the lateral pressure applied from the side wall of the groove, it is possible to expect an effect of supporting the V-ribbed portion so as to maintain the durability of the V-ribbed belt for a long period of time.

Further, in the method for manufacturing a V-ribbed belt according to the present invention, the short fiber embedded in advance is manufactured at the time of manufacturing the belt forming sleeve in accordance with the side surface inclination of the side wall surface of the V groove of the pulley with V groove. The belt V-rib is formed by setting the inclination angle of the V-shaped annular grindstone of the grinding wheel, which has been frequently used in the past, to match the setting angle of the V-shaped annular ridge formed between the V grooves of the pulley. It is possible to extremely quickly, easily and surely achieve the work of partially projecting the short fibers from the side surface and the securing of the protruding orientation of the short fibers in the vertical direction from the side surface.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a part of a V-ribbed belt embodying the present invention.

FIG. 2 is a cross-sectional view of a part of a folded sleeve in which a sleeve-shaped mold member is attached to the sleeve surface for forming an unvulcanized belt, the portion being orthogonal to the circumferential direction.

FIG. 3 is a schematic front view of a grinding device equipped with a belt forming sleeve.

FIG. 4 is a sectional view of a part of the sleeve for grinding the belt forming sleeve by a grinding wheel, the portion being orthogonal to the circumferential direction of the sleeve.

[Explanation of symbols]

 1 V-ribbed belt 5 Short fiber 5A Short fiber protruding portion 6 V rib 6A Unvulcanized rubber sheet 6B Unvulcanized rubber compression layer 6C Vulcanized rubber compression layer 11 Cylindrical drum 13 Unvulcanized belt forming sleeve 15 Mountain-shaped protrusion 16 Rubber Jacket (Member with Mold) 23 Vulcanized Sleeve for Molding Belt 24 Crest of Vulcanized Rubber Compression Layer (6C) 25 Valley of Vulcanized Rubber Compression Layer (6C) 41 Grinding Wheel 42 Angle Ring Wheel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29K 105: 24

Claims (9)

[Claims] 1. A V-ribbed belt in which a plurality of V-ribs extending in the circumferential direction are formed on the lower surface of the belt, wherein among the short-fibers embedded in the V-ribs, the short-fibers protruding from the V-rib side surface are The V-ribbed belt is characterized in that the projecting portion projects from the side surface of the V-rib while maintaining an orientation in a substantially vertical direction. 2. A V-ribbed belt wound around a V-grooved pulley, wherein the projecting portion of the short fiber embedded in the V-rib and projecting a part of it from the V-rib side surface has a V-grooved pulley. A V-ribbed belt, which is in contact with a side wall surface of a V groove in a substantially upright shape. 3. The short fibers that are completely embedded in the V-ribs maintain substantially the same orientation as the protruding short fibers that protrude in a substantially vertical direction from the side surface of the V-rib on the side where the short fibers are located close to each other. The V-ribbed belt according to claim 1, which is embedded. 4. A method of manufacturing a V-ribbed belt, which comprises the steps of: a. An unvulcanized belt molding sleeve is formed by sequentially laminating an unvulcanized rubber compression layer, in which short fibers are embedded while keeping the orientation consistent with the sleeve width direction, a tension rope, and an unvulcanized rubber cushion layer. Process, b. On the compression layer side of the unvulcanized belt molding sleeve, a sleeve-shaped mold member in which a group of mountain-shaped protrusions extending in the circumferential direction of the sleeve is juxtaposed in parallel is arranged, and the belt molding sleeve and the mold member are pressed together. By vulcanization and molding, the embedding short fiber group is formed together with the mountain shape which is continuous over the entire surface of the compression layer, and the vulcanized belt molding sleeve is formed by obliquely orienting in a continuous C shape parallel to the mountain surface. Process, c. The V-ribs of the belt are formed by grinding the compression layer with a grinding wheel having a mountain-shaped annular grindstone group corresponding to each top of the mountain formed on the compression layer surface of the vulcanized belt-forming sleeve A step of projecting short fibers extending in a substantially vertical direction from the side surface of the V-rib, d. A step of cutting a belt-forming sleeve into multiple V-rib units. 5. A method for manufacturing a V-ribbed belt, which comprises the steps of: a. Process for forming a sleeve for forming an unvulcanized belt, which is formed by sequentially laminating an unvulcanized rubber compression layer in which short fibers are embedded while maintaining an orientation that matches the sleeve direction, a tension rope, and an unvulcanized rubber cushion layer. B. On the compression layer side of the unvulcanized belt molding sleeve, a sleeve-shaped mold member in which a group of mountain-shaped protrusions extending in the circumferential direction of the sleeve is juxtaposed in parallel is arranged, and the belt molding sleeve and the mold member are pressed together. By vulcanization and molding, the embedding short fiber group is formed together with the mountain shape which is continuous over the entire surface of the compression layer, and the vulcanized belt molding sleeve is formed by obliquely orienting in a continuous C shape parallel to the mountain surface. Process, c. For the compression layer of the vulcanized belt-forming sleeve in which short fibers obliquely oriented in a continuous C-shape are embedded, grinding with a grinding wheel in which a mountain-shaped annular grindstone group is raised on the circumferential surface is performed along with the formation of V-ribs of the belt. A step in which the embedded short fibers are ground in a substantially orthogonal state with respect to the mountain-shaped annular grindstone surface, d. A step of cutting a belt-forming sleeve into multiple V-rib units. 6. The inclination direction and inclination angle of the chevron projections of the sleeve-shaped member are such that the orientation direction and orientation angle of the short fibers embedded in the compression layer of the vulcanized belt molding sleeve are substantially the same. The method for producing a V-ribbed belt according to claim 4, 7. The shape of the mountain-shaped annular grindstone forming the grinding wheel conforms to the mountain-shaped annular ridge of a V-grooved pulley on which the V-ribbed belt is mounted.
Alternatively, the method of manufacturing a V-ribbed belt according to Item 5. 8. The method of manufacturing a V-ribbed belt according to claim 4, wherein the sleeve-shaped die member is a highly contractible rubber jacket in which a group of chevron protrusions are provided in the circumferential direction of the inner peripheral surface. 9. The method of manufacturing a V-ribbed belt according to claim 4, wherein the sleeve-shaped mold member is an elastic mother mold made of rubber or urethane resin in which a group of chevron projections is provided in a circumferential direction of an outer peripheral surface.