JP2628063B2 - Timing belt with V-shape and method of manufacturing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing belt provided with a V-shaped ridge and a method for manufacturing the same, and a belt-shaped V-shaped ridge formed in a concave groove provided in a central portion of a lower surface of a rubber timing belt main body. The timing belt is mounted on a toothed pulley having an annular groove formed in the center circumferential direction by being raised so that the V-shaped member is fitted in the annular groove and mounted thereon, thereby suppressing the occurrence of lateral runout. The present invention relates to a method of manufacturing the same belt as the attached timing belt.

(Prior Art) Recently, rubber timing belts are increasingly used as synchronous transport belts. As the transport belts, concave portions extending in the circumferential direction of the belt on the lower surface of the belt to prevent meandering during driving. A belt is used in which a groove is provided, and a rubber band-shaped V-shaped member is stuck and raised by using an adhesive in this concave groove, or is stuck and raised by vulcanization. The timing belt with a belt-shaped V-shaped belt is mounted on a toothed pulley with an annular groove, and is often used as a stable synchronous transport drive belt with no lateral vibration.

(Problems to be Solved by the Invention) In a meandering prevention timing belt in which a rubber belt-shaped V-shaped ridge is raised in a concave groove provided on the lower surface of a conventional rubber timing belt, the belt is driven when the belt is driven. When a large biasing force is applied to the belt, the V-shaped ridge is raised from the V-shaped annular groove of the toothed pulley, or only the V-shaped ridge is locally localized due to the external force acting unevenly on the V-shaped ridge. It also caused damage and shortened the life of the belt itself. When this V-shaped member is formed of a rubber material similarly to the timing belt body portion, the rubber V-shaped member is bonded or integrated with the belt body in the case of using an adhesive or vulcanized and bonded. In this case, the adhesive strength is strong, but in this belt-shaped V-shaped structure, where external force tends to concentrate, urethane resin,
Compared to thermoplastic resin V-shaped members represented by vinyl chloride resin, etc., they are inferior in hardness or wear resistance,
This results in shortening the belt life itself.

On the other hand, when the belt-shaped V-shaped member is made of thermoplastic resin in order to obtain durability, and the resin-shaped V-shaped member is bonded to the rubber belt body with an adhesive, It is not possible to take a sufficient adhesive area, and the adhesive strength is weaker,
In addition, since the thickness of the V-shaped member is large at the time of bonding, uniform and sufficient pressure-bonding work cannot be performed, so that it is not possible to expect a sufficient adhesive force of the resin V-shaped member to the rubber belt body. was there.

The present invention relates to a timing belt with a V-shaped member, wherein the V-shaped member is formed of a highly durable thermoplastic resin, and the rubber timing belt body and the V-shaped member are firmly joined to each other. It is intended to provide a manufacturing method.

(Means for Solving the Problems) In order to achieve the above object, a timing belt with a V-shape according to the present invention has the following configuration.

First, a first invention of a timing belt with a V-shape includes a tension member embedded in an extension rubber layer, and a lower surface of a rubber timing belt main body in which tooth groups are provided at a predetermined pitch on a lower surface of the extension rubber layer. A concave groove extending in the longitudinal direction of the belt is formed at the center of the tooth profile. At the groove bottom of the concave groove, a belt-shaped V-shaped member made of a thermoplastic resin is joined via a band-shaped adhesive base made of the same resin, which is larger than the root of the V-shaped member. And the rubber belt body and the belt-like adhesive base have adhesive,
The band-shaped adhesive base and the band-shaped V-shaped member are joined and integrated by means of a heat-sealing means.

Next, a second invention of a timing belt with a V-shape is as follows.
A rubber timing belt main body in which a concave groove extending in the belt longitudinal direction is formed at the center of the lower surface (corrugated portion) of the belt main body having the above-described configuration, the bottom of the concave groove further includes A narrow step-like small groove is formed integrally. A belt-shaped V-shaped thermoplastic resin is formed in the groove.
The base portion of the V-shaped strip which is fitted and joined in the small-width stepped small groove is joined and integrated via a large-sized resin-made strip base.

Then, the band-shaped adhesive base and the rubber belt main body which are fitted into the step-shaped small grooves formed in the rubber belt main body are bonded and integrated with an adhesive, and the band-shaped base and the band-shaped V-shaped main body are bonded and integrated by means of heat fusion. It is characterized by having been done.

Next, as a first invention of a method of manufacturing a timing belt with a V-shape, a rubber timing belt in which tooth groups are provided at a predetermined pitch on the lower surface of an extended rubber layer in which a tensile member is embedded is provided by a known means. It is manufactured, and a concave groove extending in the longitudinal direction of the belt and reaching the bottom of the tooth profile is formed at the center of the lower surface of the belt body. Next, in joining and integrating a belt-shaped V-shaped thermoplastic resin material into the groove, a band-shaped adhesive base made of the same resin, which is larger than the root of the V-shaped resin, is attached to the bottom of the groove. And the adhesive base and the V-shaped member are joined to each other by means of heat sealing.

Also, a second method of manufacturing a timing belt with a V-shape is described.
According to the invention, a rubber timing belt is manufactured by a known means, and extends in the longitudinal direction of the belt at the center of the lower surface of the belt body and reaches the bottom of the tooth profile, and further has a concave groove at the bottom of the concave groove. A step-shaped small groove having a width smaller than that of the groove is integrally formed. Next, in joining and integrating the belt-shaped V-shaped thermoplastic resin into the concave groove, a band-shaped adhesive base made of the same resin, which is larger than the root of the V-shaped rubber, is bonded to the small step-shaped groove. The adhesive base is fitted and attached, and the adhesive base and the belt-shaped V-shaped member made of the same resin material are joined by means of heat fusion.

(Example) Next, a specific example of a timing belt with a V-shaped ridge according to the present invention will be described with reference to the drawings.

1 is a perspective view of a part of a V-shaped timing belt according to the first invention embodying the present invention, FIG. 2 is a cross-sectional view of the belt, and FIG. 3 is a bottom view of a part of the belt. FIG.

In the figure, (1) is a timing belt with a V-shape,
(2) is a timing belt main body. This belt body (2) is NR (natural rubber), SBR (styrene / butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber)
At a pitch line position in a stretched rubber layer (3) made of a single material or an appropriate blend of the members, and a low-pressure wire made of a stranded wire such as a steel wire, a glass fiber, an aramid fiber, or a polyester fiber in parallel. A tensile rope (4) having high elongation and strength is embedded, and a rubber tooth profile (5) extending in the belt width direction and made of the same material as the elastic rubber layer (3) is provided on the lower surface of the elastic rubber layer (3). ) Group is formed integrally with the stretched rubber layer (3) at a predetermined pitch over the entire lower surface of the stretched rubber layer (3), leaving a valley (6) between the tooth profiles (5).

The toothed portion (5) and the valley (6) forming the bottom portion of the timing belt main body (2) are formed so that the wooly-processed polyamide crimped yarn is stretched in the longitudinal direction and the non-stretchable polyamide yarn is stretched in the transverse direction. In particular, crimped yarns are adhered and covered with a stretchable canvas with rubber (7) woven in such a manner as to match the belt in the longitudinal direction.

At the center of the lower surface of the rubber timing belt main body (2) having the above-mentioned known configuration, a concave groove (8) extending the entire length of the belt main body in the longitudinal direction and reaching the valley (6) to substantially the same depth is provided. At the groove bottom of the concave groove (8), a thermoplastic resin having a higher hardness than the rubber material constituting the belt body (2) and having excellent wear resistance, for example, a polyurethane resin or a vinyl chloride resin is formed. Of the V-shaped ridge (9) is larger than the base portion (12) of the V-shaped ridge (9), and is bonded and joined via a band-shaped adhesive base (10) formed of the same resin material as the V-shaped ridge. Has been

At the time of this joining and integrating work, the concave groove portion of the rubber belt main body (2) and the resin adhesive substrate (10) are adhesively joined using an adhesive, and one of them is a belt-like adhesive substrate (10) made of a thermoplastic resin. ) And the belt-shaped V-shaped member (9) are heat-welded using heat-sealing means.

FIG. 4 is a cross-sectional view of a V-shaped timing belt showing an embodiment according to the second invention. In comparison with the timing belt of the first invention described above with reference to FIGS. Since the configuration of the timing belt main body (2) is exactly the same, the same components are denoted by the same reference numerals, and the detailed description thereof will not be repeated. A remarkably different component between the first and second inventions is a concave groove (8) formed over the entire length in the longitudinal direction of the belt main body at the center of the lower surface of the timing belt main body (2). A step-shaped small groove (11) having a width smaller than the groove (8) reaching the pitch line position of the belt body is formed integrally with the groove (8) at the center bottom. The concave groove (8) has a hardness higher than that of the rubber material constituting the belt body (2) and a thermoplastic resin excellent in wear resistance, for example, polyurethane resin.
A V-shaped strip (9) made of vinyl chloride resin is a step-shaped small groove (S) formed of a strip-shaped member made of the same resin material as the V-shaped strip larger than the root (12) of the V-shaped strip (9). It is joined and integrated via an adhesive base (10) fitted and joined to the 11) part.

The timing belt according to the first invention shown in FIGS. 1 to 3 is mainly formed on the tooth portion (22) of the pulley of the toothed pulley (21) partially shown in FIG.
Stepped annular groove (23) formed on the entire periphery of the center of the pulley
Of the belt-shaped V of the belt (1),
The V-shaped groove (25) and V-shaped groove (25)
By fitting the shape members (9), the tooth portions (22) of the pulleys are engaged with the tooth portions (5) of the belt, and the synchronous transport drive without vibration is executed.

The timing belt according to the second invention shown in FIG. 4 has a toothed pulley (21) partially shown in FIG.
The V-shaped groove (9) of the belt is fitted into a V-shaped annular groove (26) formed on the entire periphery of the center of the pulley, which is mainly formed on the toothed portion (22) of the pulley. The portion (22) is engaged with the tooth portion (5) of the belt, and a synchronous transport drive without vibration is executed.

Next, a specific embodiment of the first invention relating to the method of manufacturing a timing belt with a V-shape according to the present invention will be described.

FIG. 7 is a cross-sectional view showing a manufacturing process of the timing belt provided with a V-shaped belt.
The V-shaped timing belt is as described above mainly with reference to FIG. 1, and a detailed description thereof will be omitted. However, a known manufacturing means for forming the V-shaped timing belt (1) is used. The rubber-made timing belt body (2) is made of a single rubber material such as NR and SBR or a blended rubber material. Tensile rope (4)
Are embedded, and on the lower surface of the stretched rubber layer (3), a rubber tooth profile (5) is formed integrally with the stretched rubber layer (3) at a predetermined pitch leaving a valley between the tooth profiles (5). Erected,
The bottom surface of the belt including the tooth profile and the valley is stuck and covered with an elastic canvas (7).

At the center of the lower surface of the rubber timing belt main body (2) having the above configuration, a concave groove (8) extending in the longitudinal direction of the belt reaching the bottom of the belt tooth portion (5) is formed by a grinder or the like. Grind. Next, the root portion (12) of the band-shaped V-shaped ridge (9) joined in the concave groove (8).
Larger, specifically 3 to 30 mm wider than the V-shaped ridge (9)
A band-shaped adhesive substrate (10) made of a wide thermoplastic resin, for example, a polyurethane resin or a vinyl chloride resin excellent in hardness and abrasion resistance, is attached to the groove bottom of the concave groove (8) using an adhesive, and A belt-shaped V-shaped member (9) formed of the same resin material as the adhesive base (10) is heat-sealed to the surface of the adhesive base (10) using a leister (heat-sealing machine).

The second invention relating to the method of manufacturing a timing belt with a V-shape according to the present invention is specifically shown by a cross-sectional view showing a manufacturing process in FIG. The structure of the rubber timing belt main body (2), which is produced by a known manufacturing means, which constitutes the V-shaped timing belt (1), is as described mainly with reference to FIG. This is omitted.

A feature of the present invention is a concave groove (8) extending in the longitudinal direction of the belt to the bottom of the belt tooth portion by a grinder such as a grinder at the center of the lower surface of the rubber timing belt main body (2). Grinding. Further, a step-shaped small groove (11) having a width smaller than that of the concave groove (8) and reaching the depth of the belt pitch line position is formed in the bottom of the concave groove (8) integrally with the concave groove (8). Next, a thermoplastic resin having a width larger than the root portion (12) of the band-shaped V-shaped member (9) joined to the concave groove (8), specifically, a width of 3 to 30 mm wider than the width of the V-shaped member (9). A band-like adhesive substrate (10) made of a resin, for example, polyurethane resin or vinyl chloride resin, is fitted with an adhesive while being fitted into the step-like small groove (11), and is further adhered to the surface of the adhesive substrate (10). Strip V made of the same resin material as (10)
The ridge (9) is heat-sealed using a leister (heat-sealing machine).

(Effects of the Invention) In the timing belt with a V-shaped ridge according to the present invention, the V-shaped ridge having an effect to prevent the side-to-side meandering generated on the belt is a pulley when the belt is largely shifted when the belt is driven. However, since the resistance rises above the V-groove and the resistance is concentrated on the V-shaped portion, the damage is greater than that of the other part of the belt, and as a result, the life of the belt itself is shortened. By forming the loom from a thermoplastic resin having higher hardness and abrasion resistance than rubber material, it is possible to eliminate the shortening of the belt life due to local damage of the timing belt with the V-groove, Also, the weak bonding force using an adhesive generated between the different members of the thermoplastic resin V-shaped member and the rubber belt main body is reduced by the V-shaped main member at the bonding portion between the V-shaped main member and the belt main body. Plate-shaped larger than the root By interposing the adhesive base, the bonding surface between the V-shaped belt and the belt body is enlarged, and by a uniform pressing operation, the bonding strength is further increased, and the bonded base is made the same as the V-shaped base. By using the heat-sealing means, both members can be firmly fixed without variation, and when the belt is driven, the V offset from the pulley V-groove due to the biasing force of the belt can be realized. Even in the event of a run-up of the shape, the V-shape can be separated from the belt body, the belt can be damaged early due to damage to the V-shape, and the meandering of the belt due to this can be prevented to realize smooth synchronous conveyance drive. be able to.

Further, by fitting and bonding the adhesive base obtained by fusing the belt-shaped V-shaped member into the step-shaped groove, the bonding area by the adhesive can be further increased, and the V-shaped member and the belt body can be further extended. The adhesive strength can be increased, and peeling of the V-shaped member from the belt body and damage to the V-shaped member can be more reliably suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of a V-shaped timing belt according to the present invention (first invention), FIG. 2 is a cross-sectional view of the belt, and FIG. FIG. 4 is a cross-sectional view of a V-shaped timing belt embodying the second invention, FIG. 5 is a partial cross-sectional view of a timing belt toothed pulley according to the first invention, FIG. FIG. 7 is a sectional view of a part of the toothed pulley for a timing belt according to the second invention, and FIG.
FIG. 7 is a cross-sectional view showing a manufacturing process of a timing belt with a V-shape, and FIG. 8 is a view corresponding to FIG. 7 showing another embodiment. (1) Timing belt with V-shape (2) Timing belt body (3) Stretched rubber layer (4) Tensile rope (5) Tooth profile (8) Concave groove (9) V-shaped strip (10) Adhesive base strip (11) Small groove (12) Root of V-shaped strip

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-203257 (JP, A) JP-A-62-170437 (JP, U) JP-A 35-1333 (JP, Y1) JP-A-61- 4760 (JP, Y2)

Claims (8)

(57) [Claims] A tension body is buried in an extension rubber layer, and a tooth group is provided at a predetermined pitch on a lower surface of the extension rubber layer. A concave groove is formed, and a belt-shaped V-shaped thermoplastic resin is formed at the bottom of the groove, and is joined and integrated via a band-shaped adhesive base made of the same resin, which is larger than the base of the V-shaped groove. Timing belt with V-shape. 2. The belt-shaped adhesive base and the belt-shaped concave groove are bonded and integrated with each other by using an adhesive, and the belt-shaped adhesive base and the belt-shaped V-shaped ridge are bonded and integrated by means of heat fusion.
The timing belt provided with the V-shape as described in the above. 3. A tension belt is buried in an extension rubber layer, and a toothed group is provided at a predetermined pitch on a lower surface of the extension rubber layer. A concave groove and a step-like small groove having a width smaller than that of the concave groove are integrally formed on the groove bottom of the concave groove, and a belt-shaped V-shaped thermoplastic resin-made groove is formed in the concave groove. A timing belt with a V-shaped member that is joined and integrated via a large-sized resin band-shaped adhesive base from the base of the V-shaped member fitted and joined in the groove. 4. The belt-shaped adhesive base and the narrow step-shaped groove of the belt main body are bonded and integrated with each other by using an adhesive, and the belt-shaped adhesive base and the belt-shaped V-shaped member are bonded and integrated by means of heat fusion. The timing belt with a V-shape according to claim 3. 5. A concave groove extending in the longitudinal direction of the belt at the center of the lower surface of a rubber timing belt body provided with a group of teeth at a predetermined pitch on the lower surface of the stretched rubber layer in which the tensile member is embedded. In order to form and integrate the band-shaped V-shaped joint into the concave groove, a band-shaped adhesive base made of thermoplastic resin, which is larger than the root of the V-shaped groove, is provided with an adhesive at the bottom of the groove. And a band V made of the same resin material as the adhesive base.
A method for manufacturing a timing belt with a V-shape joined by means of heat fusion. 6. The method according to claim 5, wherein both the band-shaped adhesive base and the band-shaped V-shaped member are made of polyurethane resin or vinyl chloride resin. 7. A concave strip extending in the longitudinal direction of the belt and extending to the bottom of the tooth profile at the center of the lower surface of a rubber timing belt body having tooth groups arranged at a predetermined pitch on the lower surface of an extension rubber layer in which a tensile member is embedded. On the groove and further on the bottom of the groove, a step-like small groove having a width smaller than that of the groove is formed integrally with the groove, and a band-shaped V-shaped member is joined and integrated into the groove. A belt-shaped adhesive base, which is made of a thermoplastic resin larger than the base of the V-shaped ridge and is fitted into the step-shaped small groove, is fitted and adhered with an adhesive, and a V-shaped ridge made of the same resin material as the adhesive base is further formed. Is a method for manufacturing a timing belt with a V-shaped joint joined by means of heat fusion. 8. The method according to claim 7, wherein both the band-shaped adhesive base and the band-shaped V-shaped member are formed of polyurethane resin or vinyl chloride resin.