JPH01164840A - Gear shifting v-belt - Google Patents

Abstract

PURPOSE:To improve side pressure resistance and bending resistance under a high load condition, prevent deformation of a belt, and to prevent wear of a side and crank of the root part of a cog part, by a method wherein the disposing position and the thickness of the reed screen like layer of the lateral reed screen like cord layer of a compression part are regulated, and rubber between the reed screen like cord layers is improved. CONSTITUTION:Tension member ropes 1 are buried in a parallel manner in a cushion rubber layer 2 along the longitudinal direction of a belt. Reed screen like cords 3 and 4 are laterally buried in a plurality of layers on and below the layer 2, and expandable canvas is laminated in a plurality of laminating layers 5 on the layer 3. A compression rubber layer 6 is formed on the under surface of a layer 4, and cog parts (b) are formed at a specified pitch in the compression rubber layer. Fiber reed screen like cords 7 in a 2-layer are laterally and longitudinally of a belt buried in a waveform manner at the same period as that of a cog waveform along the cog part (b). A rubber layer 9 mixed with HRH is buried in various reed screen like layers 3, 4, and 7. Further, the total thickness of the lateral reed screen like layers 4 and 7 is set to a value being 0.20-0.45 times as large as a thickness W of a portion between an extension substance layer and the lowermost under surface of a cog root part.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a low edge type speed change belt that has an upper surface that is wider than the height of the belt, and has high lateral pressure resistance and bending resistance.

(Conventional technology→ Conventionally, ■Belts ■Transmit power by the wedge effect that occurs when driving by winding pulleys, so they have high lateral pressure resistance, and have a particularly wide top surface.■Belts have high lateral pressure resistance. Therefore, as a measure to increase such lateral pressure resistance, a Stayflex layer containing short fibers oriented in the width direction of the belt is used in the compressed part. When the belt is used, deformation occurs, and the more frequently the upper width of the pulley is opened and closed, the greater the deformation becomes.Eventually, the tensile rope peels off and the tension layer cracks, leading to the end of the belt's life. In addition, when the pulley is opened and closed, the belt repeatedly moves in the radial direction of the pulley under a large force, resulting in side wear and other problems such as changes in the gear ratio. As described in Japanese Utility Model Application Publication No. 57-150645, there is a
- A variable speed belt (B ) was proposed (Figure 5).

(Problem to be solved by the invention) However, although the cog-equipped transmission belt with such a structure has good lateral pressure resistance compared to the conventional transmission belt, it is used in applications such as large combine harvesters, rice transplanters, etc. that require higher loads. When used in the condition,
Side pressure resistance and bending resistance are still insufficient, and there are problems such as belt deformation, side wear, and cog valley cracks.

In order to solve this kind of problem, the present invention adjusts the placement position and thickness of the lateral sudare record layer in the compression section and improves the rubber between the sudare record layers, thereby improving lateral pressure resistance under high load conditions. The object of the present invention is to obtain a speed change belt with cogs that has good bending resistance, is free from belt deformation, and is free from side wear and cog valley cracks.

(Means for solving the problems) In order to achieve the above object, the present invention is characterized by:
This is a variable speed belt with a cog, which has an extension part, a tensile body part, and a compression part in this order from the top. It has a horizontal suda record and is also tensile.

At a position that roughly bisects the space between the body layer and the bottom surface of the cog valley,
It has at least one layer of horizontal groove records, and these horizontal groove records are buried in a wave shape with the same period as the cog waveform with a rubber layer containing HRH interposed between each horizontal groove record, and the horizontal groove records in the moon compression part are buried in a wave shape with the same period as the cog waveform. This is a variable speed belt in which the sum of the layer thicknesses is in the range of 0.20 to 0.4-5 times the thickness between the tensile layer and the bottom surface of the cog valley.

(Example) Hereinafter, the cog-equipped speed change belt according to the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a partial perspective view of the cog-equipped transmission belt according to the present invention, and Fig. 2 is a partial side view thereof. In the figure, (A) is the belt main body, (2) is NR, SBR, CR, N
A cushion rubber layer consisting of a single material such as BR or a combination of these materials, and the cushion rubber layer (2
), low elongation and high strength tensile ropes (1) such as polyester, aliphatic polyamide, aromatic polyamide (trade name: Kevlar) or glass fiber are buried in parallel along the longitudinal direction of the belt. ing. The upper and lower layers of the cushion rubber layer (2) are made of polyester, aliphatic polyamide,
One or more layers of Sudarecord (3) (4) made of aromatic polyamide, glass fiber, or carbon fiber are embedded in the horizontal direction, and on the upper surface of the transverse Sudarecord layer (3), warp and warp yarns are laid. Bias canvas, wide-angle canvas, or stretchable canvas (5) woven with woolly-processed crimped nylon warp and normal nylon weft are laminated in one or more layers, usually one to eight layers. Further, a compressed rubber layer (6) is further provided on the lower surface of the lateral side record layer (4) under the cushioned rubber layer (2) as usual. A cog part (b) is formed, and along this cog part (b), two layers of fiber cord (7) made of cotton, polyester, aliphatic polyamide, aromatic polyamide, glass fiber, etc. are formed in the lateral direction and the belt. It is buried in a wave shape with the same period as the cog waveform in the longitudinal direction.

Incidentally, the horizontal sag (7) is not limited to the two layers described above, but one to a plurality of layers can be used, and it is usually preferable to embed one to three layers.

The buried position of these two horizontal sagging layers (7) is the tensile layer (1).
) and the bottom surface of the cog valley (8) is preferably at a position that approximately bisects the space, or slightly above that position.

In addition, in order to improve the adhesive strength with each adjacent layer, the above-mentioned various sagging layers (3), (4), and (7) contain at least 1 part by weight of resorcin resin (referred to as R) per 100 parts by weight of the comb. A rubber compound containing 10 parts by weight or more of silica (denoted as H) and 1 part by weight or more of a chemical that generates methylene groups (denoted as H) such as hexamethylenetetramine, a so-called HRH compounded rubber layer (9) is embedded. ing.

Further, among the horizontal sagging layers (3), (4), and (7), the lateral sagging layer (4) buried below the tensile rest hole (1) is
) The total thickness of (7) must satisfy the following formula.

That is, now the distance between the lower surface of the tensile member and the lowermost surface of the cog valley is Wm
m, the diameter of the lateral sag layer (4) adjacent to the lower part of the tensile layer and the lateral sag layer (7) located approximately at the center of the tensile layer and the bottom surface of the cog valley are Dlmm, D 2mm, respectively.
When the number of plies is N1 and N2, respectively, it is necessary to select Dl, N1, D2, and N2 so as to satisfy 0.20W<DINl+D2N2<0.4.5W (FIG. 2). In addition, here, the horizontal sagging layer (4)
If the total thickness of (7) is 0.20W or less, the effect of lateral pressure resistance is small, and - the total thickness of right lateral sagging layer (4) (7) is 0.
．． If it exceeds 45 W, there will be a problem that the bending resistance will decrease and the durability life will be shortened, so it is desirable to keep it within the above range. Furthermore, it goes without saying that short fiber groups may be embedded in other rubber layers of the compressed portion (6) in a transverse direction, if necessary.

Next, the effects of implementing the speed change belt with cogs according to the present invention will be explained. Belt height 35mm, thickness 15mm, ■
Transmission with a cog with an angle of 28° and a belt outer circumference length of 1256 mm ■The diameter of the sag on the lower surface of the belt tension member is Di” 0.4
QmmXD2=0.68mm horizontal suda record (4) (
7) Transmission gear with cogs of the present invention with 2 plies embedded in each belt (A) and side sag (7) with a sag diameter of 0°68 mm
As shown in Figure 3, the conventional cog-equipped transmission belt (B) with two flies embedded in the compression part is connected to the drive pulley (D).
R) and the driven pulley (DN) have a center distance (X) of 350
Wrap in mm, 20p, s.

Low speed running under load conditions (DR diameter 9oφ, DN diameter 240
φ and rotation speed 175 Orpm) for 20 seconds, high speed running (DR
Diameter 170φ, DN diameter 170φ, rotation speed 175°rpm)
A running test was conducted in which one cycle was 60 seconds, and the belt wear amount and belt appearance were examined, as shown in Figures 4 and 1.
The results shown in the table were obtained.

Margin Table 1 The belt wear margin is 1.054 mm at 2,000 cycles, whereas the belt wear margin is 0.60 mm at 3,000 cycles with the variable speed belt (Δ) of the present invention, and the belt wear margin is 0.60 mm at the same number of cycles. When evaluated, the top width wear margin of the speed change belt of the present invention was less than 1/2 of that of the conventional belt, and the appearance of the belt showed no cracks, indicating a significant improvement.

(Effects of the Invention) As described above, the present invention ■Transmission with a type cog■The belt is a transmission with a cog■The compressed part of the belt is adjacent to the tensile layer -9==1 and the intermediate part of the compressed part is each 1 ~Multiple layers of side sag are buried through a rubber layer containing HRH, and the total thickness of the sag in the compressed part is 0.2 of the thickness of the compressed layer at the cog valley.
By adjusting it within the range of ~0.45 times, it has good bending resistance, the upper width wear during belt running is significantly reduced, there is no cracking in the cog valley, and the side pressure resistance is also good, so it is suitable for automobiles. This is a variable speed belt that has excellent performance and is suitable for use in agricultural machinery and other general industries.

[Brief explanation of the drawing]

Figure 1 is a partial perspective view of the transmission belt with moss according to the present invention, Figure 2 is a partial side view of the transmission belt with cogs according to the invention, and Figure 3 is a partial perspective view of the transmission belt with moss according to the present invention.
The figure is a schematic diagram of the running test equipment to confirm the implementation effect.
FIG. 4 is a graph showing the running test results, and FIG. 5 is a partial side view showing an example of a conventional speed change belt. (a)... Belt body (b)... Cog part (X)... Distance between shafts (1)... Tensile rope (2)... Cushion rubber layer (3) (4) ( 7)...Horizontal sagging layer (5)...
Stretchable canvas (6)...Compressed rubber layer (8)...Lowermost surface of cog part (9)...HRH rubber layer Patent applicant Mitsuboshi Belting Co., Ltd.

Claims (1)

[Claims] 1. A variable speed V-belt with a cog, which has an extension part, a tensile part, and a compression part in order from the top, the tension part is made up of an elastic canvas and at least one layer of horizontal strap records, and the compression part is located below the tension part. It has at least one layer of transverse strut record, and further has approximately two layers between the tensile layer and the bottom surface of the cog valley.
At least one layer of horizontal strip records is provided at equally divided positions, and these horizontal strip records are embedded in a wave shape with the same period as the cog waveform, with a rubber layer containing HRH interposed between each horizontal strip record layer. In addition, the sum of the thicknesses of the transversal record layers in the compression part is 0.00000000000000000000000000000000000000000000000000000000000,00,000
Shift V characterized by being in the range of 20 to 0.45 times
belt.