JPH057180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a V-belt for high-load transmission used in automobile transmissions and the like.

(Prior Art) Conventionally, gear-type or fluid-type transmissions have been widely used in automobiles or agricultural machinery such as combines and tractors, but in recent years, improvements in operability during gear changes, Belt-type continuously variable transmission devices are being developed with the aim of improving fuel efficiency.

However, the belt used in this belt-type continuously variable transmission requires an extremely high torque transmission ability, and conventional rubber V-belts cannot withstand high lateral pressure and buckle when used. Can not do it.

Therefore, in order to satisfy such requirements, conventionally,
Various high-load transmission belts have been proposed (for example, JP-A-46-4861, JP-A-55-27595, JP-A-56-76745, JP-A-59-77147, JP-A-60)
-Refer to each publication No. 49151).

In addition, for the present applicant, Japanese Patent Application Laid-Open No. 60-49151
As shown in the publication, this type of V-belt for high-load transmission has been proposed. That is, as shown in FIG. 5, for example, this product basically has a plurality of core wires 1'a, 1'a, . . . inside a shape-retaining layer 1'b.
A pair of endless tension bands 1', 1' on the left and right made of rubber, etc., with (core bodies) arranged in parallel and buried.
and a notch-shaped fitting part 2'a on the left and right sides, into which each tension band 1' is removably fitted from the width direction.
It consists of a large number of blocks 2', 2', . ', 2', . . . are continuously fixed in the longitudinal direction of the belt A'.

In this proposed V-belt A′,
Concave grooves 1'c, 1' of a constant pitch extending in the width direction of each block 2' correspond to the upper surface of each tension band 1'.
c, .
1'd, . . . , respectively, and on the upper wall surface of the fitting portion 2'a of each block 2', a protrusion 2'b that fits into each groove 1'c on the upper surface of the tension band 1 is fitted. Joining part 2'
A protruding strip 2'c that fits into each groove 1'c on the lower surface of the tension band 1' is formed on the lower wall surface of a. The blocks 2', 2', . . . are fitted into grooves 1'c, 1'd of the belt 1' to lock and fix the blocks 2', 2', . . . in the longitudinal direction of the belt.

(Problems to be Solved by the Invention) In this device, each block 2' is locked in the grooves 1'c, 1'd on the upper and lower surfaces of each tension band 1', and each tension band 1' Although the blocks 2' are held by the elasticity of the shape-retaining layer 1'b, the fitting portions 2'a of each block 2' are connected to the upper and lower beams 2'd, 2'e. The tension band 1' fitted into the portion 2'a is in a non-adhesive state. For this reason,
When belt A′ is bent to a predetermined radius of curvature along a pulley (not shown) or when shearing force is generated in the belt longitudinal direction for power transmission,
An interfacial phase difference or slip occurs at the contact surface between each block 2' and the tension band 1'. Particularly during high-speed transmission, the amount of heat generated by this slip is large, which tends to shorten the life of the belt.

In addition, when frictional heat due to sliding occurs at the contact surface between each block 2' and the tension band 1', the shape-retaining layer 1'b of the tension band 1' hardens or deteriorates, causing the tension band 1' to Cracks are likely to occur from the bottom of each groove 1'c, 1'd, and when this crack reaches each core wire 1'a, there is a risk that the tension band 1' will be cut and the belt A' will be damaged. be. Therefore,
Considering this phenomenon, there is room for further improvement.

It has been experimentally clarified that the site where cracks begin to occur in the tension bands 1' due to the generation of frictional heat, that is, where cracks occur initially, is at the center position in the width direction of each tension band 1'.

The original object of the present invention is to make the tension band described above consist of an endless flat belt having a core wire, and to integrate a large number of blocks in a pair of tension bands by a block holding part at the middle part in the width direction of the belt. It is glued to the belt to continuously fix it in the longitudinal direction of the belt.
A concave groove-shaped cog portion extending in the belt width direction is formed on the side opposite to the tension band of the block holding portion, and the radius of curvature of the fitting lower wall surface on the left and right sides of each block is bent to the minimum radius of curvature. By setting the radius of curvature of the tension band when The purpose of the present invention is to improve the durability of the V-belt during high-speed transmission and extend its lifespan.

However, in that case, in order to reliably provide the above-mentioned V-belt, it is a prerequisite that the tension band consisting of a flat belt and each block can be bonded to each other by a block holding part, and in reality, this is not possible. It is desirable to establish a method.

Therefore, the object of the present invention is to further enable the formation of block holding parts for adhering each of the blocks to the tension band by a predetermined method,
The purpose is to ensure the provision of V-belts.

(Means for Solving the Problem) In order to solve this problem, the solution of the present invention is to leave a gap between adjacent blocks when a large number of blocks are sequentially arranged in the longitudinal direction of the belt. The block holding portion is formed by pouring adhesive resin or the like through the gap.

Specifically, the method of the present invention, as described above, includes a pair of tension bands made of endless flat belts in which core wires are embedded, and each tension band is fitted into the left and right sides from the width direction thereof. A large number of blocks are provided with a pair of notch-shaped fitting portions and have sliding portions on the left and right sides that slide into contact with the groove surfaces of the pulley, and are arranged between the adjacent blocks, and each block is connected to the sliding portion. and a block holding part that is adhesively fixed to the upper and lower surfaces of the tension band at the left and right middle parts excluding the contact parts, and each block is glued to each tension band by the block part and fixed in the longitudinal direction of the belt. This is a method of manufacturing a V-belt.

As a feature thereof, first, the above-mentioned large number of blocks are arranged in series in order, and the above-mentioned pair of tension bands is fitted into the left and right fitting portions of each block from the width direction.

Next, the block holding portion is formed by injection or compression molding through the upper and lower gaps between the adjacent blocks.

(Function) With this configuration, in the case of manufacturing a V-belt, in the present invention, the pair of tension bands is fitted from the width direction into the left and right fitting portions of a large number of blocks arranged in series. In this method, the block holding part is formed by injection or compression molding through the upper and lower gaps between the adjacent blocks, so that the formation of the block holding part for bonding each block and the tension band can be established.
Therefore, it is possible to reliably provide the V-belt.

(Example) Next, an example of the present invention will be described based on the drawings.

First, the structure of a V-belt to be manufactured by an embodiment of the method of the present invention will be explained based on FIGS. 3 and 4. The basic structure of this V-belt is the same as that explained with reference to FIG. 5, so the same reference numerals are used for the same parts as in FIG.

That is, the V-belt A basically has a core wire 1 inside a shape-retaining layer 1b made of rubber, urethane rubber, etc.
Tension bands 1, 1 consisting of a pair of endless flat belts in which a, 1a, ... are embedded, and a notch-shaped fitting part 2a into which each tension band 1 is fitted from the width direction on the left and right sides, respectively. , 2a, and between the adjacent blocks 2, 2, and each block 2 is integrally adhesively fixed to the upper and lower surfaces of the tension band 1 at its left and right intermediate portions. By fitting the tension bands 1, 1 into the left and right fitting parts 2a, 2a of each block 2, respectively, each block 2
is fixed in the longitudinal direction of the belt.

Each of the blocks 2 has a pair of flange portions 3b, 3b wider than the main body 3a at an intermediate position on the left and right sides.
and a substantially trapezoidal plate-shaped reinforcing member 3 tapered so that both flange parts 3b, 3b converge toward the belt downward direction, and a reinforcing member 3 having the same size as each flange part 3b of the reinforcing member 3. It consists of a pair of sliding contact members 4, 4 which are integrally joined to the left and right sides of the flange portions 3b, 3b, respectively, and each flange portion 3b of the reinforcing member 3, and the flange portion 3b. With the sliding contact member 4 joined to,
A sliding contact portion that is wider than other portions is configured.

The reinforcing member 3 shares the pressing force toward the center of the V-pulley by the thrust and belt tension applied in the belt width direction from the V-pulley (not shown) around which the V-belt A is wound. Constructed from highly rigid materials such as iron, aluminum alloy, and high-strength plastic. On the other hand, each sliding contact member 4 shares the transfer of force between the belt groove surface of the V pulley A and the left and right side surfaces of the belt, and has excellent wear resistance and low noise properties, and It is made of rubber, plastic, etc. whose coefficient of friction has been adjusted.

Further, each of the block holding parts 5 holds each block 2 at the left and right flange parts 3 of its reinforcing member 3.
It is adhesively fixed to the upper and lower surfaces of the left and right tension bands 1, 1 in the main body 3a of the reinforcing member 3, excluding the sliding contact members 4, 4 on the outer surfaces thereof, and is made of rubber, urethane rubber, etc. Made of resin etc. Each of the block holding parts 5 includes an upper part 5a located above the tension bands 1, 1 and a lower part 5b located below the tension bands 1, 1. 1 and 1 are integrally connected by a connecting portion 5c extending in the vertical direction.
Further, each of the block holding parts 5 has a concave groove shape extending in the belt width direction on the surface opposite to the tension band 1, that is, on the upper surface of the upper side portion 5a and on the lower surface of the lower side portion 5b. Cog portions 5d and 5e are formed.

Further, on the lower wall surface of each fitting part 2a of each block 2, the belt length of the portion corresponding to the flange member 3b of the reinforcing member 3 or the sliding contact member 4 continuous thereto, which is not bonded to the lower surface of each tension band 1. The radius of curvature r in the direction is set to correspond to the radius of curvature of each tension band 1 when the V-belt A is bent to the minimum radius of curvature. The V-belt A is configured as described above.

Examples of the method of the present invention will be specifically described below.

(1) First, as shown in Fig. 1, a large number of blocks 2, 2, ... as constituent elements of the V-belt A,
A pair of tension bands 1, 1 consisting of an endless flat belt is prepared, and as shown in the figure, the above-mentioned large number of blocks 2, 2, . . . are sequentially arranged in series while keeping the same posture. In this way, a large number of blocks 2,
When the blocks 2, .

(2) Next, while maintaining the above state, as shown in FIG.
Insert from the width direction. In this state, each block 2 and the tension bands 1, 1 are not fixed, but are simply locked.

(3) After this, by injection molding or compression molding, adhesive resin, rubber, etc. is poured through each gap G formed between the reinforcing member bodies 3a, 3a of the adjacent blocks 2, 2, and the block holding portion is 5, and this block holding part 5
Each of the blocks 2 is glued to the tension bands 1, 1 by the following steps. Through the above steps, V-belt A is manufactured as shown in FIGS. 3 and 4.

The V-belt A thus obtained has the following effects. That is, the flange portions 3b, 3b of the reinforcing member 3 of each block 2
The main body 3a other than the tension bands 1, 1 is integrally adhesively fixed to the tension bands 1, 1 at the center of the belt A by each block holding part 5, and each block holding part 5 has a concave groove extending in the belt width direction. Since the cog portions 5d and 5e are formed in the shape of a shape, even if the V-belt A is bent along the belt groove of the pulley, the cog portions 5d and 5e of the block holding portion 5 are formed.
is only elastically deformed, and no slipping occurs at the interface between each block 2 and each tension band 1 in the center of belt A. Therefore, heat generation due to friction between each block 2, tension band 1, and block holding portion 5 can be suppressed.

Furthermore, in the left and right side portions of the belt A, each flange portion 3b or sliding member 4 of the reinforcing member 3 of each lock 2 is not adhesively fixed to the tension band 1, so that slippage occurs at the interface between the two. but,
Since these parts are on the left and right sides of the belt A, the heat dissipation effect is large, and since the block holding part 5 is not arranged in that part, there is no cog bottom as a starting point for cracks, thus suppressing the occurrence of cracks. can do.

Further, on the lower wall surface of each fitting portion 2a of each block 2, the radius of curvature r of the portion corresponding to each flange portion 3b or sliding member 4 of the reinforcing member 3 that is not bonded to the lower surface of the tension band 1 is is set to the radius of curvature of tension band 1 when bent to the minimum radius of curvature. The tension can be evenly received on the upper surface of the side part, and the tension distribution in the longitudinal direction of the belt A can be made uniform. Therefore, the occurrence of local stress concentration and strain deformation in the core wire 1a of the tension band 1 can be suppressed, and the occurrence of cracks in the tension band 1 can be suppressed more effectively. Therefore, as above,
By suppressing heat generation due to slippage at the interface between each block 2 and the tension band 1 and making it difficult to generate cracks in the tension band 1, the high-speed durability of the V-belt A can be enhanced and its lifespan can be extended.

In addition, since the left and right side portions of each block 2 formed by the respective flange members 3b or sliding contact members 4 of the reinforcing member 3 are formed wider than other portions, each block 2 is bonded to the tension band 1. In order to fix the blocks 2, 2, reinforcing members 3,
While ensuring the gap G for forming the block holding part 5 by pouring resin or rubber between the pulleys 3 and 3, the contact area of the pulley with the belt groove surface is increased as a whole, and the force between the pulley and the belt groove surface is increased. It is possible to reliably give and receive.

Therefore, in this embodiment, as described above, the block holding portion 5 for adhering each block 2 and the tension bands 1, 1 can be reliably formed, and therefore, it has the excellent high-speed durability as described above. A long-life V-belt A can be reliably provided.

Note that canvas layers may be formed on the upper and lower surfaces (the surface side of the shape-retaining layer 1b) of the flat belt used as the tension band 1 in the above embodiment. In this case, the reinforcing effect of the canvas layer makes it possible to more reliably prevent the tension band 1 from cracking.

(Effects of the Invention) As explained above, according to the present invention, a large number of blocks are integrally attached to a pair of tension bands made of an endless flat belt having core wires by a block holding part at the middle part in the width direction of the belt. When manufacturing a V-belt that is bonded and held continuously in the longitudinal direction of the belt, the above-mentioned pair of tension members are fitted from the width direction into the left and right fitting parts of a large number of blocks arranged in sequence. In this state, the block holding parts are formed by injection molding or compression molding through the upper and lower gaps between the adjacent blocks, thereby ensuring that the block holding parts for bonding each block and the tension band are securely formed. Can be formed. Therefore, heat generation due to slippage at the interface between each block and the tension band is suppressed, and the tension distribution in the longitudinal direction of the belt in each tension band is uniform, making it difficult for cracks to occur, resulting in a high-speed belt with excellent high-speed durability. This makes it possible to reliably provide a V-belt with a long service life.

[Brief explanation of drawings]

1 to 3 are perspective views showing each manufacturing process in an embodiment of the present invention, and FIG. 4 is a sectional view taken along the line -- in FIG. 3. FIG. 5 is a perspective view of a conventional V-belt. A... V-belt, 1... Tension band, 1a... Core wire, 2... Block, 2a... Fitting part, 3b...
Flange part, 4... Sliding member, 5... Block holding part, 5d, 5e... Cog part, G... Gap, r...
…curvature radius.

Claims (1)

[Claims] 1 A pair of tension bands consisting of an endless flat belt in which a core wire is embedded, and a pair of notch-shaped fitting parts on the left and right sides of each of the tension bands to fit each of the tension bands from the width direction thereof. , a large number of blocks having sliding contact parts slidingly in contact with the groove surfaces of the pulleys on the left and right sides, and arranged between the adjacent blocks, each block being placed above the tension band at the middle part of the left and right excluding the sliding contact parts. A method for producing a V-belt, comprising a block holding part adhesively fixed to the lower surface, and each block being fixed in the longitudinal direction of the belt by being glued to each tension band by the block holding part, the method comprising: The blocks are arranged in series in order, and the pair of tension bands is fitted into the left and right fitting portions of each block from the width direction, and then injection or compression is applied through the upper and lower gaps between the adjacent blocks. A method for manufacturing a V-belt, characterized in that the block holding portion is formed by a molding method.