JPS5810611B2 - Asia Stress V-belt and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an adjustable V-belt for power transmission that automatically absorbs and adjusts belt elongation that occurs while the belt is running and can run with a constant tension at all times, as well as its V-belt. Regarding the manufacturing method.

Conventionally, belts such as flat belts, V-belts, and poly V-belts use power transmission to transmit power through the belt's frictional force, and as a result, the belt requires a certain tension depending on the driving conditions when running. shall be.

If the tension becomes loose due to belt elongation during running, the grip force with the pulleys will decrease, causing slippage. Moreover, once the belt slips, the belt elongation will further increase due to heat generation, and the amount of slip will accelerate. This will eventually lead to premature belt failure due to heat generation.

Therefore, in order to fully improve the durability of the belt, it is desired that the belt has little elongation and can maintain a tension above the limit value that causes slipping.

Recently, ropes with high heat shrinkage stress, such as synthetic fiber ropes such as polyester fibers, have been sought as belt tensile materials. The technical idea of suppressing the stretching phenomenon of the belt by contraction of the body has attracted attention, and in order to reduce the elongation of the rope tensile body during the series of manufacturing processes, hot stretching treatment of the rope tensile body is widely used before the belt forming process. It is being done.

However, the more heat-stretched these synthetic fiber ropes are, the greater the heat shrinkage stress during vulcanization. When sulfurized, the rope tensile body shrinks due to shrinkage stress and falls into the rubber layer, which reduces the shrinkage stress and results in a belt with large elongation.In more extreme cases, the rope tensile body in the rubber layer shrinks. It was very difficult to obtain a well-ordered pitch line on the rope tension member.

Here, we will list a few specific examples of the above-mentioned defects that occur in the manufacturing process of conventional rubber V-belts or cogged V-belts, and secondary defects that occur when preventive measures are taken. As illustrated in FIG. 1, O to several plies of rubberized canvas 24 are wrapped around a cylindrical mold 21 or a mold with irregularities formed on the outer peripheral surface (not shown), and unvulcanized compressed rubber is wrapped around it. The sheet 22 and the adhesive rubber sheet 23a are laminated, a tensile outer rope 26 made of polyester fiber with a large heat shrinkage stress is wound spirally thereon, and an unvulcanized adhesive rubber 23b and a canvas cloth 25 with rubber are further placed on top of the sheet 22 and the adhesive rubber sheet 23a.
After laminating O to several plies, the belt molded body is vulcanized by external pressure and heating, and cut into rings of a predetermined width to produce a V-belt. The upper and lower unvulcanized adhesive rubber layers 23b and 23a sandwiching each other are embedded in the rubber layers due to their flow, but the amount of rubber that flows between the spirally wound tensile ropes is very small. Since the amount of friction is small, activation of the surface of the tensile rope 26 is unlikely to occur.

Since the surfaces of the adhesive rubber layers 23b and 23a which are not yet vulcanized are mixed with various compounded chemicals, softeners, etc., chemicals that inhibit adhesion are blooming and the surfaces of the rubber layers with poor adhesion are mixed. In combination with the presence of the inert surface rope tension member 26, the rope tension member 26 and the adhesive rubber layers 23a, 2
3b, and as mentioned above, the rope tension body 26 with heat-shrinkable properties is wrapped around the flexible unvulcanized rubber layer, so the rope tension during vulcanization is reduced. When the body undergoes heat contraction, the adhesive rubber layer 23a at the bottom of the rope tension body
and falls into the compressed rubber layer 22 as shown by the arrow, causing disturbance in the arrangement of the rope tensile members 26, that is, the pitch line, as shown in the cross-sectional view of the V-belt in FIG. This results in non-uniformity of the belt, resulting in a defect that causes premature failure of the belt.

As a measure to prevent the tensile member from collapsing due to thermal contraction, one possible method is to attach a reinforcing canvas 27 to prevent the rope from collapsing below the rope tensile member 26, as illustrated in FIG. In this case as well, the rope tensile body 26 buried in the adhesive rubber layer 23 falls below the adhesive rubber layer 23 and comes into contact with the reinforcing canvas 27, so that peeling may occur at this portion.

Further, as illustrated in FIG. 4, the upper rubberized canvas 25, the adhesive rubber layer 23, the rope tensile body 26, the compressed rubber layer 22, and the bottom rubberized canvas 24 are sequentially wound around the mold 21 and then pressurized and vulcanized. There is also a reciprocal method in which the belt molded body is cut into rings of a predetermined width and then turned over to make the belt, but even with this method, the phenomenon of dropping of the tensile material during vulcanization cannot be avoided, and the tensile material 26 is cut into rings as shown by the arrow. As a result, the adhesive falls into the adhesive rubber layer 23 and comes into contact with the upper rubber cloth 25 as shown in FIG.

As mentioned above, even in the measures to prevent collapse, there is no rubber layer between the tensile body and the reinforced canvas or the upper rubberized canvas.
Since the tensile member is in direct contact with the canvas, the adhesion of the rope tensile member is reduced, and early peeling of the rope tensile member occurs during belt running, which cannot be said to be a sufficient preventive measure.

Therefore, an object of the present invention is to focus on the problems that occur on the conventional rubber V-belts mentioned above, and to provide a new V-belt that eliminates these drawbacks.

Specifically, it automatically adjusts to accommodate the elongation of the belt that occurs while the belt is running, allowing the belt to run with a constant tension at all times, and the adjustable belt V has good performance and does not cause early peeling of the tensile member while the belt is running. The purpose is to provide belts.

Another object of the present invention is to provide an effective and practical method for manufacturing an adjustableless V-belt as described above.

Therefore, the specific features of the adjustableless V-belt of the present invention to achieve the above objects include a compressed rubber layer made of heat-resistant or cold-resistant synthetic rubber, and an adhesive rubber layer laminated on top of the compressed rubber layer. A group of cogs is integrally provided on the top of the adhesive rubber layer with a certain pitch and depth extending in the width direction of the belt, and the group of cogs and each valley between the groups of cogs are covered with a cover canvas having elasticity, Between the adhesive rubber layer and the cog group, a rope tension member having a large heat shrinkage stress with a heat shrinkage stress difference of 3.5 g/denier or more at 100°C and room temperature is maintained on the same circumference with an orderly pitch line. , a part of which is embedded in a state in contact with the stretchable canvas, and a group of short fibers is embedded in the compressed rubber layer in a horizontal direction, and further improves the downward flexibility of the belt. This is due to the fact that a group of cogs is also provided in the downward direction of the belt.

A more detailed description of the adjustableless V-belt of the present invention and a method for manufacturing the adjustableless V-belt of the present invention with other features are further described below.
It will be revealed.

In Fig. 7, 1 is a V-belt body, and the V-belt body 1 is made of CR rubber, NBR rubber, a heat-resistant synthetic rubber that is a blend of these rubbers, a blend of NR rubber and SBR rubber, or CR rubber. An adhesive rubber layer 3 of 60 to 80 degrees (Shore hardness) made of the same material as the compressed rubber layer 2 is laminated on the compressed rubber layer 2 made of a cold-resistant rubber blended with BR rubber. Cog groups 4 extending in the width direction of the belt are integrally protruded on the surface of the adhesive rubber layer 30 at a constant pitch and depth.

Here, it is desirable that the pitch p of the cog group 4 and the depth t of the cocks fall within the following range in relation to the belt thickness d.

However, p: pitch, t: depth, d: belt thickness, or if the pitch p of the upper cog 4 is less than 1.5, the chevron shape of the cog becomes thinner and the lateral rigidity becomes smaller. Accidents such as cogs breaking and scattering while the belt is running are likely to occur, and conversely, if the cog pitch p is larger than 3.5t, the rope tension body should be wound over the protrusion of the mold when forming the belt. In this case, the side cross section of the rope is polygonal, and when the belt runs, the belt pitch line on the pulley will pulsate, causing belt vibration and heat generation. <3.5t is the optimal range.

Furthermore, if the depth t of the cog 4 is less than 0.12d, the cog 4 becomes thinner, and the reinforcing effect of the cog portion on the rope tensile body decreases, which affects the belt life, and also causes the belt itself to bend and deform in the lateral direction. There is a problem that the cog 4 falls into the groove of the V pulley, and stress concentrates only on the tensile member at the end of the belt, reducing the belt life. If it is greater than 4d, the pitch line of the rope tension member will inevitably become lower, the effective number of ropes and the effective transmission area will decrease, and the transmission force of the belt will decrease. 12 dots<0.4d.

Further, the cogs and the valleys between the cogs are frictionally coated with a heat-resistant synthetic rubber or cold-resistant rubber made of the same material as the constituent material of each of the rubber layers 2 and 3, which is stretchable only in the longitudinal direction of the belt. The entire surface is covered with a cover canvas 5 having elastic properties, and this stretchable cover canvas 5 is woven with a woolly processed crimped nylon warp 5a and a normal unprocessed nylon weft 5b, as shown in FIG. Stretchable warp threads 5a are arranged in the longitudinal direction of the belt to provide light flexibility in the longitudinal direction of the belt, while ordinary nylon weft threads 5b provide rigidity in the width direction of the belt.

In this case, the crimped yarn or regular yarn may be replaced with a crimped yarn or regular yarn of polyester fiber.

6 is incyanate and REL liquid, the surface of which was adhesively treated and heat set at 200°C at 100°C and 20°C.
A tensile material made of polyester fiber or polyamide fiber having a heat shrinkage characteristic of ΔE100-20=3.5 g/denier or more, which is formed in a spiral shape between the adhesive rubber layer 3 and the cog 4, A part of the tensile member 6 is buried with an orderly pitch line on the same circumference in contact with the cover canvas 5 at the trough position of the cog group, and the stress difference ΔE100 of the tensile member rope is・2
Since 0=3.5 g/denier or more, a structure is adopted that can exert heat shrinkage stress against the heat generation phenomenon during belt running.

In order to improve the lateral pressure resistance and abrasion resistance of the belt, the compressed rubber layer 2 contains various short fiber groups 8 of 1 to 100 parts by weight of rubber.
It is buried horizontally at a ratio of about 0 to 30 high-resolution areas, and is made of a heat-resistant and cold-resistant rubber layer made of the same material as the adhesive rubber layer 3, and the lower surface of the compressed rubber layer 2. Cog groups 9 are formed at a constant pitch without covering the canvas.

This cog group 9 preferably has the following relationships among the cog pitch p', the cog depth t', and the belt thickness d.

If the cog pitch p' on the lower surface of the belt is set to 1.5 or less, the cog shape will inevitably become smaller, similar to the cog group of the upper adhesive rubber layer 3, which will cause a decrease in lateral pressure resistance during running. If the pitch p' is set to 3.5 or more, when the belt is bent on the pulley, it is likely to buckle at the polygon, that is, the cog valley, which may cause cracks in the cog. Cog pitch p' is 1
．． It is necessary to satisfy 5t<p'<3.5t.

On the other hand, the cog depth t' needs to be 0.25d or more in order to effectively increase the bending resistance.
When the cog depth t' is set to 0.5 d or more, the bending resistance against the pulley decreases, which is effective, but it also has the disadvantage of decreasing the lateral pressure resistance and shortening the durability of the belt.
It is preferable that 0.25d<t'<0.5d.

By adopting the above-mentioned configuration, the V-belt of the present invention satisfactorily solves the shrinkage stress of the belt during heat generation, as well as the elasticity, flexibility, lateral pressure resistance, and abrasion resistance of the belt's upper and lower surfaces. V-belts with cogs on the bottom have greater flexibility than V-belts without cogs, so they can be used even with small pulley diameters, and have the advantage of allowing for compact designs. On the other hand, with such cog-type V-belts, it is difficult to pull out the cog part when the belt wedged in the pulley separates from the pulley, and the belt gets stiff because it is pulled out forcibly, and the friction coefficient of the cog part is large. If this happens, it becomes difficult to pull out, and the tacks become even bigger, and this is repeated periodically, causing a problem of noise generation when the belt is driven.For example, V-belts for automobiles have the advantage of being able to be used with small pulley diameters. However, due to the noise it makes, it is rarely used in trucks, buses, etc.

In order to solve such noise problems, the V-belt of the present invention further includes one to a plurality of layers, preferably two to five layers, over the entire surface of the cog 9 on the lower surface of the belt compressed rubber layer 2, as shown in FIG. A rubberized bias canvas 7 made of ply cotton yarn, or a woolly-processed crimped nylon warp 5a and a normal nylon weft 5b, which are stretchable only in the longitudinal direction of the belt, as shown in FIG.
Laminated and pasted rubberized canvas woven with.

Thus, this allows the belt to be withdrawn from the pulley,
That is, noise can be reduced by easily reducing slippage with a canvas having a low coefficient of friction, and since the slippage between the canvas and the pulley is large, stress concentration in the bottom groove of the belt can be avoided and cracks can be prevented.

The above is a case where the pitch of the cog group 9 provided on the lower surface of the belt is constant, and noise during driving can be prevented to a certain extent.
Since the cog pitches are at equal intervals, the milking when the belt is pulled out is repeated periodically, and as a result, the noise prevention effect is diminished and the effectiveness is hindered, so the V-belt of the present invention further reduces noise. To achieve this, the cog pitch on the underside of the belt can be made random.

9 and 10 are partial side views when the cog pitches on the lower surface of the belt are randomly provided, and FIG. 9 shows the pitch P'1 of the cog 9 without covering the cog portion with canvas. P'2. P
'3... are provided at unequal intervals, and FIG. 10 shows the unequal pitches p'1. p'2. p'3...
A rubberized bias canvas 7 made of cotton yarn similar to the canvas covered with the cog portions 9 formed at equal pitches, or woven with woolly-processed crimped nylon warp 5a and normal nylon weft 5b. One to a plurality of layers of rubberized canvas having elasticity only in the longitudinal direction of the belt are laminated and adhered.

By randomly setting the pitch of the cogs on the underside of the belt as described above, when the belt is driven, the pressure of the cogs against the side of the pulley becomes uneven, and as a result, when the belt is pulled out, tacking occurs at irregular intervals. The sound is also dispersed and becomes intermittent, reducing noise.Furthermore, the coefficient of friction is lowered by laminating and pasting canvas on the random cogs, improving the slippage between the belt and pulley and reducing stickiness when pulling out. Can be made smaller.

Note that the range in which the cog pitch p' is made random is 1.5t'<p, as mentioned above, due to the lateral pressure resistance, flexibility, etc. of the belt.
Within the range of '<3.5t', a range of about 5 to 10 mm is usually suitable.

As described above, the V-belt according to the present invention has a structure in which cog groups are provided not only on the upper surface of the belt but also on the lower surface of the belt, and the compressed rubber layer 2 and the adhesive rubber layer 3 that constitute the main body of the belt are made of CR material with excellent heat resistance. NR-8BR, CR-B to prevent hardening and embrittlement of rubber, NBR rubber, or belts in cold regions.
Since it is composed of blended rubber such as R, its properties are utilized in devices that generate a lot of heat due to high-speed running of the belt, such as V-belts for automobiles. By using the belt's body, the tension body can sufficiently contract against the heat generated by the belt's high-speed running and repeated bending movements, as well as the heat generated by the belt's slipping, and there is no need to re-tension the belt as in the past, and automatic In addition, the belt can be made to have good flexibility by protruding cogs at a constant pitch and depth upward on the belt, and the cogs have elasticity only in the longitudinal direction. The flexibility of the belt is further enhanced because the canvas is coated with a canvas that has a Furthermore, short fiber groups are embedded in the compressed rubber layer, oriented in the horizontal direction, increasing the rigidity of the belt in the horizontal direction and preventing the belt from deforming and falling into the pulley. In this case, only one ply of elastic canvas can prevent the optical belt from deforming in the lateral direction.

In addition, the rope tension member is embedded in the belt adhesive layer with a portion of it in contact with the cover canvas, which prevents local fatigue of the belt, and the cover canvas is made of the same rubber as the main material of the belt to reduce friction. This makes the adhesiveness of the cover canvas even stronger, and part of the rope tension body is covered with this cover canvas, and the other part is completely buried under the cog, so the tension body The phenomenon of peeling from the main body of the belt is effectively suppressed.

Furthermore, by providing a group of cogs with a uniform pitch or a random pitch on the lower side of the belt as described above, the flexibility of the lower surface of the belt is improved and use with a small pulley diameter is possible. The belt can be easily pulled out from the pulley by laminating and pasting bias canvas or canvas with elasticity in the longitudinal direction.
In particular, it has many advantages, including the ability to reduce noise generated during high-speed rotation.

The above is related to the adjustable stress V belt according to the first invention of the present invention.
Regarding the invention related to a method for manufacturing a belt, FIGS. 11 and 12 show a method for manufacturing an adjustableless V-belt using a reverse molding method, which has cog groups on both the upper and lower surfaces of the belt and has aligned rope tension members. I will explain while referring to it.

That is, as shown in FIG. 11, groups of belt-like projections 16 and groups of grooves 13 between the projections 16 are alternately formed over the entire outer surface of the mold 11 in the axial direction of the outer surface of the cylindrical mold 11. Woolly-processed crimped nylon warp 5a as shown in FIG. 6 above
and ordinary nylon weft 5b, and after adhesive treatment, CR
The cover canvas 5 is friction-treated with rubber, NBR rubber, a heat-resistant synthetic rubber blended with these rubbers, or a blended rubber such as NR-3BR or CR-BR orange, and the warp threads 5a of the cover canvas 5 are usually threaded in the longitudinal circumferential direction of the mold 11. With the
Can be wrapped.

At this time, if necessary, the canvas 5 is wrapped in a slightly relaxed state so as to fit into the groove 13 as shown in FIG. 11.

However, when using the stretchable canvas having particularly high stretchability, it is not necessarily necessary to fit it into the groove 13, but it may be arranged at approximately the same length as the outer circumferential length of the mold 11.

Therefore, the protrusions of the mold 11 used here are 1.0 in relation to the pitch W of the protrusions, the height h of the protrusions, and the belt thickness d based on the pitch and depth of the cog group 4 of the belt.
It is formed within the range of 5h<w<3.5h and 0.12d<h<0.4d.

Next, isocyanate-based and RF
The surface was adhesively treated with Li and heat set at 200°C, and the difference in heat shrinkage stress between 100°C and 20°C was △E100-2.
0=3.5g/denier or more diameter 0.6. ~2.5mm
The tension of the polyester fiber rope or polyamide fiber rope tensile body 6 is 1.5 to 3.5 times the normal tension of 0.2 to 0.6 g/denier in order to exert sufficient heat shrinkage stress when the belt heats up. Wrap it spirally under the tension of
An unvulcanized adhesive rubber sheet 3a' made of a cold-resistant rubber such as a blend of CR-BR is used to form the cog 4 of the belt 1, and the amount of rubber is enough to be interposed over the entire lower surface of the tensile member 6. Then, a compressed rubber sheet 2a' made of the same heat-resistant synthetic rubber or cold-resistant rubber as the adhesive rubber layer 3a' is wrapped around it, and the compressed rubber sheet 2a7 forms the main body of the belt rubber part. Adhesive rubber sheet 3
This rubber sheet, which is thicker than A', is made by adding 10 to 3 of various short fiber groups to 100 parts by weight of rubber using a calender or the like in advance for the purpose of improving lateral pressure resistance and abrasion resistance.
A rubber sheet is used which is oriented and mixed in the transverse direction at a ratio of about 0 parts by weight, and finally a bias-like rubber finish is prepared by friction-treating the same rubber as the adhesive rubber sheet 3a' and the compressed rubber sheet 2a. The molding work is completed by wrapping 2 to 5 plies of cotton canvas or elastic canvas 7 with rubber made of woolly-processed crimped nylon 5a on the warp as shown in FIG.

Here, it is not necessary to wrap the last rubberized canvas 7 in a belt as shown in FIG. 7, in which the lower surface of the belt is not covered with the rubberized canvas.

Thus, the belt molded body obtained in the belt molding process is vulcanized by being subjected to the vulcanization process, and in FIG. The tension member 6 and the canvas 50 are wrapped around each other to form a triangular gap between the tension member 6 and the canvas 50.

Similarly, when using stretchable canvas with particularly high elasticity,
As mentioned above, it is not necessary to provide a void.

Next, a cylindrical matrix 12 made of hard rubber is fitted onto the outer peripheral surface of the belt molded body, and the inner peripheral surface of the matrix 12 has a semicircular shape or A wave-shaped protrusion group 14 is provided, and this protrusion group 14 has a pitch J of the protrusion 14, a protrusion height h', and a belt thickness d based on the pitch and depth of the cog group 9 on the lower surface of the belt. ′
In the relationship, 1.5h'<w'<3.5h', 0
．． The projections 14 are formed within a range of 25d<h'<0.5d, and the pitch w' of the protrusions 14 is formed at a constant pitch or a random pitch within the above range.

Next, the belt molded body fitted with the matrix 12 is placed in a vulcanizing can, and vulcanization is performed by introducing steam of 7 to 8 kg/cm2 into the can, as shown in FIG. 12. As the protruding matrix 12 is heated and pressurized by high-temperature, high-pressure steam, the unvulcanized internal rubber sheet 3a'2a'
is in a fluid state, and in particular, the adhesive rubber sheet 3a' that is in direct contact with the tensile member 6 is pressed against the tensile member 6 by external pressing force.
While stretching the stretchable cover canvas 5 from the gap, it flows into the groove 13 as shown by the arrow and forms the top cog group 4 of the belt, while the compressed rubber layer 2a' presses the rubberized canvas 7 on the bottom surface of the belt and moves from the left as shown by the arrow. The concave grooves 15 of the mother die 12 are filled to form a lower cog group 9, thereby forming a belt molded body having cog groups on the upper and lower surfaces of the belt.

At this time, the amount of rubber flowing through the gaps between the tensile members 6 is much larger than in the case of conventional molding as illustrated in FIG. As a result, the surface of the adhesive rubber sheet 3a' and the surface of the tensile member 6 are activated, and each part of the tensile member 6, the adhesive rubber layer 3, and the cog 4 constituting the belt body 1 is bonded. Power increases further.

In addition, in the belt manufacturing method according to the present invention, △E100-20=3
．． Tensile material 6 with a weight of 5 g/denier or more is added to the normal 1.5 to 3.
Although it is wound with five times the tension, since the position of the tensile member 6 is maintained by the protrusion 16, there is no drop of the tensile member due to heat shrinkage due to vulcanization, and the tensile member 6 remains the same. They are arranged in an orderly manner on the pitch line of the circumferential surface.

After vulcanization in the can for the required time, the master mold 12 is removed and the belt molded body is then taken out from the mold 11.

The removed belt molded body is then cut into a ring shape in the longitudinal direction of its circumference to a predetermined width using a known method, and is further turned over to form a so-called belt with cog groups on both the upper and lower surfaces of the belt as shown in FIG. A plurality of double cog type adjustableless V-belts can be obtained.

As described above, the V-belt obtained by the manufacturing method of the present invention was obtained by using the reciprocal method as described above to obtain ΔE100-20=3.5.
A method is used in which a rope tensile material with heat shrinkage properties of 1.5 g/denier or more is wrapped directly around the outer circumference of a hard metal mold with band-like protrusions on the outer surface, and then directly wrapped on a thin nylon cover canvas with good elasticity. As a result, there is no phenomenon of the tensile members falling due to heat shrinkage during vulcanization as in conventional methods, and all the tensile members are arranged neatly on the pitch line, even when slip heat occurs during belt running. Because the belt itself undergoes heat contraction uniformly, there is no need to install a tension pulley or adjust the distance between the axes of the pulleys to prevent the belt from elongating, as in the past, and the tension can always be maintained at a constant level. In addition, during belt forming, the surface of the tensile member is activated because the unvulcanized rubber with high viscosity flows between the tensile members in a turbulent state, and the upper part is made of nylon. Since the rubber layer of the cog group is interposed between the cover canvas and the tensile material, there is no peeling phenomenon as in the conventional method, and the adhesive property is also improved.

Furthermore, the V-belt produced by the method of the present invention has a group of cogs with a uniform pitch or a random pitch formed on the lower surface of the belt as well.The lower surface of the belt has good flexibility and can be used with a small pulley diameter. Laminating and pasting a rubber bias canvas or elastic canvas on the surface improves the flexibility of the underside of the belt, and also improves the slippage between the belt and pulley, making it easier to pull out the belt, which can occur especially during high-speed rotation. It can also reduce noise.

As described above, the present invention has remarkable effects not only on the effectiveness of the adjustableless V-belt itself but also on the method of manufacturing it, and is useful and effective as an invention for providing a new and improved V-belt for power transmission. This is an industrially excellent invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the manufacturing method of a conventional V-belt;
Fig. 2 is a cross-sectional view of a V-belt obtained by the manufacturing process shown in Fig. 1, Fig. 3 is a cross-sectional view of a conventional modified V-belt, and Fig. 4 shows a method of manufacturing a V-belt using a conventional alternative method. FIG. 5 is a cross-sectional view of the V-belt obtained by the manufacturing process shown in FIG. 4, FIG. 6 is a partial plan view of the nylon cover canvas used in the V-belt of the present invention, and FIGS. Fig. 8 is a partial cross-sectional perspective view of the adjustableless V-belt according to the present invention, Fig. 9 is a partial side view of the V-belt shown in Fig. 7 with the cog portions arranged at random pitches, and Fig. 10 is the V-belt shown in Fig. 8. FIGS. 11 and 12 are partial side views showing the cog portions having random pitches, and are stepwise partial cross-sectional views showing aspects of the molding and vulcanization process of the adjustableless V-belt according to the present invention. 1... V-belt body, 2... Compressed rubber layer, 3
... Adhesive rubber layer, 4 ... Cog group on top surface, 5 ... Stretchable cover canvas, 6 ... Tensile body, 7 ... ... Bottom canvas, 8 ... Short fiber group, 9 ... Bottom cog group, 11 ... Mold, 12 ... Mother mold, 13 ... ...concave groove, 16
, 14...protrusion, 15...concave groove.

Claims (1)

[Claims] 1. An adhesive rubber layer is laminated on a compressed rubber layer made of heat-resistant or cold-resistant rubber, and the adhesive rubber layer has a group of cogs having a constant pitch and depth on the top thereof. A cover canvas having elasticity is attached to the surface of the cog group and the troughs between the cog groups in the length direction, and between the adhesive rubber layer and the cog group,
A rope tensile member with a large heat shrinkage stress with a difference in heat shrinkage stress of 3.5 g/denier or more between 00°C and room temperature maintains an orderly pitch line on the same circumference, and a part thereof is in contact with the cover canvas. An adjustableless V-belt, characterized in that the compressed rubber layer has a group of short fibers oriented in the horizontal direction and is embedded therein, and a group of cogs is provided on the lower surface of the compressed rubber layer. 2. The adjustableless V-belt according to claim 1, wherein the cover canvas covering the upper cog group is a stretchable canvas woven with woolly-processed crimped nylon warp and normal weft. 3. Adjustable rest V according to claim 1 or 2, in which the pitch and depth of the upper cog group are within the following ranges:
belt. 1.5t<P<3.5t 0.12d<t<0.4d However, p: pitch, t: depth, d: belt thickness 4 Patent in which the rope tensile body with large heat shrinkage stress is polyester fiber An adjustableless V-belt according to claim 1, 2, or 3. 5. The adjustableless V-belt according to claim 1, 2, or 3, wherein the rope tensile member having a large heat shrinkage stress is a polyamide fiber. 6. The adjustableless V-belt according to any one of claims 1 to 5, wherein the adhesive rubber layer has a hardness of 60 to 80 degrees in yaw hardness. 7. Adjustment according to claims 1 to 6, wherein the amount of the short fiber group to be oriented laterally in the compressed rubber is 10 to 30 parts by weight per 100 parts by weight of rubber. Less V belt. 8. The adjustableless V-belt according to any one of claims 1 to 7, wherein the pitch of the cogs on the lower surface of the compressed rubber layer is constant. 9. An adjustableless V-belt according to any one of claims 1 to 7, wherein the pitch of the cogs on the lower surface of the compressed rubber layer is irregular. 10. The adjustableless V-belt according to claim 8 or 9, wherein the pitch and depth of the cog group on the lower surface of the compressed rubber layer are within the following ranges. 1.5t'<p'<3.5t'0.25d<t'<0.5d However, p': pitch, t': depth, d: belt thickness 11
An adhesive rubber layer is laminated on a compressed rubber layer made of heat-resistant or cold-resistant rubber, and the adhesive rubber layer integrally has a group of cogs having a constant pitch and depth on its upper part, and A cover canvas having stretchability is applied to the surface of the cog groups and the valleys between the cog groups in the length direction, and there are 10
A rope tensile body with a large heat shrinkage stress with a difference in heat shrinkage stress of 3.5 g/denier or more at 0°C and normal humidity is kept in an orderly pitch line on the same circumference, and a part of it is attached to the cover canvas. The compressed rubber layer has a group of short fibers oriented in the horizontal direction buried therein, and a group of cogs is provided below the compressed rubber layer, and the surface of the cog group on the lower surface of the compressed rubber layer An adjustableless V-belt characterized by having one or more layers of rubberized canvas laminated and adhered to the belt. 12. The adjustableless V-belt according to claim 11, wherein the rubberized canvas laminated and adhered to the cog group on the lower surface of the compressed rubber layer is a bias canvas. 13. The canvas with rubber laminated and adhered to the group of cogs in the downward direction of the compressed rubber layer is a stretchable canvas woven with woolly-processed crimped nylon warp and normal nylon weft. Adjustable V-belt. 14 A cover canvas having stretchability is wrapped in the longitudinal direction around a mold in which belt-like protrusions and grooves are alternately formed in the axial direction of the outer surface, and a heat-stretching process is performed on the mold to shrink the mold at 100°C and normal humidity. A rope tension member with a large heat shrinkage stress with a stress difference of 3.5 g/denier or more is wound in a spiral shape, and then an adhesive rubber sheet and a compressed rubber sheet with short fibers oriented in the transverse direction are sequentially wound on top of it. A cylindrical matrix having a group of cogs formed on the inner circumferential surface is fitted onto the outer surface of the thus obtained belt molded body, and
This is heated and pressurized to extrude and fill a portion of the adhesive rubber sheet into the grooves of the mold, and a portion of the compressed rubber sheet is also filled into the grooves of the matrix to form cog groups on both upper and lower surfaces. A method for manufacturing an adjustable V-belt characterized by the following. 15. The method for manufacturing an adjustableless V-belt according to claim 14, wherein the pitch and height of the band-like protrusions formed on the mold are within the following ranges. However, w: pitch of protrusions, h: protrusion height d: belt thickness 16 The tension at which the rope tensile body is wound is normal tension, that is, 1.5 to 3.5 of 0.2 to 0.6 g/d. Adjustable stress V according to claim 14 or 15 which is double
Belt manufacturing method. 17. The adjustableless V-belt according to claim 14, 15, or 16, wherein the pitch and height of the group of protrusions of the cylindrical matrix fitted into the outer surface of the compressed rubber layer are within the following ranges. Production method. However, w: protrusion pitch, h': protrusion height, d': belt thickness 18 A cover canvas having elasticity in the length direction is wrapped around a mold in which belt-like protrusions and grooves are alternately formed in the axial direction of the outer surface. On top of that, a rope tensile material with a high heat shrinkage stress with a difference of 3.5 g/denier or more between heat shrinkage stress at 100°C and normal humidity is wrapped in a spiral shape, and further on top of that. An adhesive rubber sheet, a compressed rubber sheet in which short fiber groups are oriented in the transverse direction, and one or more layers of bias canvas or stretchable canvas are sequentially wrapped around the belt, and the cogs are attached to the outer surface of the thus obtained belt molded body. A cylindrical mother mold formed in the mold is fitted into the mold, and then heated and pressurized to extrude and fill a portion of the adhesive rubber sheet into the groove of the mold. A method for manufacturing an adjustableless V-belt, characterized in that a portion of the rubber is filled into the groove of the matrix to form a group of cogs covered with a cover canvas on the compressed rubber surface. 19. The method for manufacturing an adjustableless V-belt according to claim 18, wherein the pitch and height of the band-shaped protrusions formed on the mold are within the following ranges. However, w: protrusion pitch, h: protrusion height, d: belt thickness, 20 The tension at which the rope tensile body is wound is a normal tension, that is, 1.5 to 0.2 to 0.6 g/d. The method for manufacturing an adjustableless V-belt according to claim 18 or 19, which is 3.5 times as large. 21 Claim No. 2, wherein the pitch and height of the protrusions of the cylindrical matrix fitted into the outer surface of one or more layers of bias canvas or stretchable canvas wrapped on the compressed rubber layer are within the following ranges: The method for manufacturing an adjustableless V-belt according to item 18, 19, or 20. However, w': protrusion pitch, h': protrusion height,