JP3112228U - Cogudo V Belt - Google Patents

Abstract

The present invention provides a cogged V-belt that suppresses the occurrence of cracks from the cogg valley caused by swelling of the cogg valley in the belt width direction of the compression rubber layer and the side pressure from the pulley.
An adhesive rubber layer having a core wire embedded therein, provided on an inner peripheral side of the adhesive rubber layer, a compressed rubber layer comprising a plurality of cog peaks and cog valleys, and an outer peripheral side of the adhesive rubber layer. A cogged V-belt 1 comprising a plurality of cog ridges and cog troughs and having a stretched rubber layer 5 on at least one side of the belt contacting the pulley, including the cog valleys of the compressed rubber layer, and the bonding The cogged V belt is characterized in that a groove portion 11 is provided over the entire circumference of the belt in a region not including the rubber layer.
[Selection] Figure 1

Description

  The present invention relates to a cogged V-belt, and more particularly to a cogged V-belt that suppresses the occurrence of cracks from the cog valley.

  A cogged V-belt used in a transmission such as a two-wheeled vehicle or a snow vehicle is provided on the inner peripheral side of the adhesive rubber layer 28 having the core 29 embedded therein, as shown in a sectional perspective view in FIG. The compression rubber layer 22 and the elastic rubber layer 25 are provided on the outer peripheral side of the adhesive rubber layer 28. The compression rubber layer 22 and the elastic rubber layer 25 are each provided with a cog mountain 23, 26 and cog valleys 24 and 27 are provided.

  In such a cogged V-belt 21, in addition to the fact that the compressive stress at the time of belt bending tends to concentrate on the cog valley 24 of the compression rubber layer 22, the cog valley 24 swells in the belt width direction when the belt is bent. Since the side pressure from the pulley is received, the stress is concentrated in the cog valley 24 and there is a problem that cracks are likely to occur. This phenomenon becomes prominent in high-load / high-tension operation, and is one of the main causes of breakage of the cogged V-belt. As a cogged V-belt that takes measures against this problem, Patent Document 1 discloses a cogged V-belt that suppresses the occurrence of cracks from the cog valley by forming the compression rubber layer from two rubber layers having different elastic moduli. It is disclosed.

JP 2000-18338 A

  However, in the cogged V-belt disclosed in Patent Document 1, there is a problem in that the manufacturing cost is inevitably increased by forming the compression rubber layer with two rubber layers having different elastic moduli, No countermeasure is specified for the swelling in the belt width direction and the stress concentration in the cog valley due to the side pressure from the pulley.

  The present invention has been made to solve such problems, and suppresses the occurrence of cracks from the cogg valley caused by the swelling of the cogg valley in the belt width direction of the compressed rubber layer and the side pressure from the pulley. An object of the present invention is to provide a cogged V-belt.

  That is, the device according to claim 1 of the present application provides an adhesive rubber layer in which a core wire is embedded, an inner peripheral side of the adhesive rubber layer, a compressed rubber layer composed of a plurality of cogs and cogs, and an outer circumference of the adhesive rubber layer. A cogged V-belt comprising a stretched rubber layer composed of a plurality of cogs and cogs, at least one of the side surfaces of the belt in contact with the pulley, including the cog-valley of the compressed rubber layer, and the adhesive rubber The cogged V belt is characterized in that a groove portion is provided over the entire circumference of the belt in an area not including the layer.

  The invention according to claim 2 is the cogged V-belt according to claim 1, wherein a cross section of the groove portion perpendicular to the longitudinal direction of the belt is arcuate.

  According to the invention described in the claims of the present application, it is possible to provide a cogged V-belt that suppresses the occurrence of cracks from the cogg valley caused by the swelling of the cogg valley of the compressed rubber layer in the belt width direction and the side pressure from the pulley. it can.

  The cogged V belt of the present invention will be described in detail below. FIG. 1 shows a cross-sectional perspective view of a cogged V-belt of the present invention. The cogged V-belt 1 is formed in a structure in which an inner peripheral compression rubber layer 2, an outer peripheral extension rubber layer 5, and an adhesive rubber layer 8 between both rubber layers 2 and 5 are laminated. A core wire 9 extending in the longitudinal direction of the belt is embedded in the layer 8. The compressed rubber layer 2 and the stretched rubber layer 5 are alternately formed with cog mountains 3 and 6 and cog valleys 4 and 7 extending in the belt width direction along the belt longitudinal direction.

  Here, as rubbers forming the compression rubber layer 2, the stretch rubber layer 5, and the adhesive rubber layer 8, natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfonated polyethylene, hydrogen A single composition of a rubber material such as a nitrile rubber, a mixed polymer of a hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt, or a composition of these mixtures can be used.

  Further, it is preferable to mix fibers in the compressed rubber layer 2 and the stretched rubber layer 5. As fibers to be blended, fibers such as aramid fibers, polyamide fibers, polyester fibers, and cotton can be used. Although the fiber length varies depending on the type of fiber, a short fiber of 1 to 10 mm is used. For example, aramid fiber is 3 to 5 mm, and polyamide fiber, polyester fiber or cotton is about 5 to 10 mm. The The adhesive rubber layer 8 may contain fibers, but preferably does not contain fibers.

  Moreover, as the core wire 9, what processed the aramid fiber, the polyester fiber, the glass fiber, etc. with the RFL liquid can be used. Further, a reinforcing cloth may be laminated on the surface of the compressed rubber layer 2 or the surface of the stretched rubber layer 5. As the reinforcing fabric, a canvas woven in a plain weave, twill weave, satin weave, etc. can be used as cotton, polyester fiber or nylon fiber. After treatment with RFL solution, the rubber composition is fiction-coated. Can be used as rubber canvas. The RFL liquid is obtained by mixing an initial condensate of resorcin and formalin with latex such as chloroprene, styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber (H-NBR), NBR, and the like. .

  In the cogged V-belt 1, it is located on at least one side of the belt in contact with the pulley and includes the cogg valley 4 of the compressed rubber layer 2 and does not include the adhesive rubber layer 8. Grooves 11 are provided on both side surfaces.

  The cross section perpendicular to the belt longitudinal direction of the groove portion 11 is preferably an arc shape such as a semicircular shape in order to prevent the groove portion itself from becoming a crack generation source. Further, it is preferable that the groove portion 11 has a depth that does not disappear due to wear on the side surface of the belt, specifically, a depth of at least 2 mm. Due to the presence of the groove 11, contact between the cog valley 4 and its peripheral region and the pulley is avoided, so that the stress of the cog valley 4 is reduced as compared with the case where there is no groove 11. Generation of cracks is suppressed.

  The groove 11 is formed by bringing a grinding wheel having a grindstone of a predetermined shape into contact with a predetermined position of the cogged V-belt 1 while rotating the conventional cogged V-belt 1 manufactured by a normal manufacturing method on a pulley. Is done.

  The groove portion 11 is provided on at least one side surface of the cogged V belt. In this case, the side where the groove portion 11 is provided is selected as the side close to the engine where the material is likely to deteriorate due to heat and cracks are likely to occur in the belt transmission system. In addition, the groove part 11 may be provided in the side surface of the both sides of a cogged V belt.

Hereinafter, the cogged V belt of the present invention will be described in more detail with reference to examples.
Here, instead of actually producing a cogged V-belt and examining the occurrence of cracks, an analysis result using a finite element analysis method (FEM) is shown. Details of the FEM analysis of the cogged V-belt are described in JP-A-2002-107237. In this embodiment, a part of the method described in the above publication is extracted, and stress under a specific winding condition and pulley side pressure condition of a cogd V-belt having a specific size using the FEM program, particularly the cogging of the compressed rubber layer. Calculate the minimum principal stress (maximum compressive stress) acting on the valley. Hereinafter, a specific cogged V-belt is assumed, and the conditions for calculating the minimum principal stress of the cog valley of the compressed rubber layer are specifically shown.

(A) The dimension of the cogged V-belt is set.
The belt thickness is 14.7 mm (breakdown is the stretch rubber layer cog mountain height 3.6 mm, stretch rubber layer cog valley to core wire distance 1.3 mm, core wire to compression rubber layer cog valley distance 3.8 mm, compression rubber layer cog (Height 6.0 mm), the belt angle was set to 26 degrees, and the width on the belt was set to 30 mm. About the groove part, the width | variety on a belt side surface was set to the circular arc shape of 3.3 mm and the curvature radius of 2 mm.

(B) Set geometric data and physical property data of the finite element model of the cogged V-belt.
The elastic modulus of the core wire (truss element) is 12000 MPa, its Poisson ratio is 0.3, the elastic modulus of the core wire layer (virtual layer whose core wire diameter is its thickness) is 180 MPa, its Poisson ratio is 0.49, The elastic modulus of the adhesive layer (the virtual layer for bonding the compressed rubber layer or the stretched rubber layer and the core wire layer) is 6 MPa, its Poisson ratio is 0.49, the elastic modulus of the compressed rubber layer is 75 MPa, and its Poisson ratio is 0. .49.

(C) Set the use conditions for the cogged V-belt.
The driving pulley pitch diameter was set to 72 mm, the driven pulley pitch diameter was set to 156.6 mm, and the pulley side pressure was set to 1801 N.

(D) Set a finite element model of the cogged V-belt.
In the longitudinal direction of the belt, one pitch of the cog of the compressed rubber layer was modeled, and in the belt width direction, since the belt has a symmetrical shape, only half was modeled. Further, the core wire was set as a two-node truss element, and the core layer, the adhesive layer, and the compression rubber layer were each set as an eight-node three-dimensional solid element.

(E) The elasticity analysis program is executed.
The minimum principal stress acting on the cog valley of the compressed rubber layer was calculated using a general-purpose non-linear FEM analysis program of MSC, Inc. operating on a general-purpose personal computer as an elastic analysis program. FIG. 2 shows a graph of the minimum principal stress obtained by calculating for each node toward the virtual plane side at the center of the belt with the distance on the pulley contact side being zero.

(Comparative Example 1)
The minimum principal stress in the cog valley of the compressed rubber layer was calculated in the same manner under the same conditions as in Example 1 except that no groove was provided in Example 1. The results are also shown in FIG.

  When the minimum principal stress in the vicinity of the pulley contact portion was compared, Example 1 showed a smaller value than Comparative Example 1 in absolute value. It has been clarified that the stress in the cog valley is reduced by providing the groove in the cog valley of the compressed rubber layer, so that an actual cogged V-belt is expected to have an effect of suppressing cracking.

  It is possible to provide a cogged V-belt that suppresses the occurrence of cracks from the cogg valley caused by the swelling of the cogg valley in the belt width direction of the compressed rubber layer and the side pressure from the pulley.

It is a cross-sectional perspective view of the cogged V belt of this invention. It is a graph which shows the Cog valley stress calculated by FEM analysis. It is a cross-sectional perspective view of the conventional cogged V belt.

Explanation of symbols

1 Cogged V-belt 2 Increased compression rubber 3 Cog mountain 4 Cog valley 5 Stretched rubber layer 6 Cog mountain 7 Cog valley 8 Adhesive rubber layer 9 Core wire 11 Groove

Claims (2)

Adhesive rubber layer with core wire embedded, provided on the inner peripheral side of the adhesive rubber layer, provided on the outer peripheral side of the compressed rubber layer consisting of a plurality of cog mountains and cog valleys, and the adhesive rubber layer, In a cogged V-belt composed of a stretched rubber layer made of a valley, on the entire circumference of the belt in a region that is on at least one side of the belt contacting the pulley and includes the cogged valley of the compressed rubber layer and does not contain the adhesive rubber layer A cogged V-belt characterized in that a groove is provided across. The cogged V belt according to claim 1, wherein a cross section of the groove portion perpendicular to the longitudinal direction of the belt has an arc shape.

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