JPH0518514Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a technology for improving V-belts 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. 9, 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'.
grooves 1' with a constant pitch extending in the width direction of the grooves 1'c, 1'c,...
d, 1'd, . . . are formed on the upper wall surface of the fitting portion 2'a of each block 2'. , protrusions 2'c are formed on the lower wall surface of the fitting part 2'a to fit into the grooves 1'c on the lower surface of the tension member 1', and protrusions 2'b, 2' of each block 2' are formed. 'c are fitted into grooves 1'c, 1'd of the tension band 1', respectively, to lock and fix the blocks 2', 2', . . . in the longitudinal direction of the belt.

(Problem to be solved by the invention) By the way, 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 block 2' is held by the elasticity of the shape-retaining layer 1'b of the block 2', the fitting portion 2'a of each block 2' is not 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'e, 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'.

Therefore, the original purpose of the present invention is to make the above-mentioned tension band consist of an endless flat belt having a core wire, and to attach a large number of blocks to a pair of tension bands, and to attach a block holding part at the middle part in the width 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 left and right side portions of each block are integrally bonded and fixed and held continuously in the longitudinal direction of the belt. By setting the radius of curvature of the lower fitting wall surface to the radius of curvature of the tension band when the belt is bent to the minimum radius of curvature, it is possible to suppress the sliding phenomenon at the contact surface between each block and the tension band. The purpose of this invention is to reduce the accompanying frictional heat and eliminate the causes of cracks in the tension belt, thereby improving the durability of the V-belt during high-speed transmission and extending its life.

By the way, in that case, as a method of adhering each block to a tension band made of a flat belt using a block holding part, injection molding, compression molding, etc. can be used between adjacent blocks with the tension band fitted to the fitting part of each block. A possible method is to bond the two together by pouring a resin or the like that will become the block holding part. In that case, a gap is required between adjacent blocks, and as a result, the arrangement of the blocks with respect to the tension band becomes rough, and as a result, there is a risk that the overall contact area between the belt and the belt groove surface of the pulley becomes smaller. There is.

A further object of the present invention is to improve the structure of the block itself so that the block can be bonded to the tension band without reducing the contact area between the belt and the belt groove surface of the pulley. .

(Means for Solving the Problem) In order to solve this problem, the solution of the present invention is to use a pair of tension bands, as a V-belt, consisting of an endless flat belt in which core wires are embedded, as described above. A pair of notch-like fitting parts are provided on each of the left and right sides to fit each of the above-mentioned tension bands from the width direction thereof, and a plurality of sliding contact parts are provided on the left and right sides for slidingly contacting the groove surface of the pulley. block, and a block holding part disposed between the adjacent blocks and adhesively fixing each block to the tension band at the left and right intermediate parts excluding the sliding contact part, each block holding the block. The structure is such that the belt is fixed in the longitudinal direction of the belt by being glued to each tension band by a portion.

The block holding portion is provided with a groove-like cog portion extending in the belt width direction on the upper and lower surfaces of the block holding portion opposite to the tension band.

In addition, when the belt is bent to the minimum radius of curvature in the belt longitudinal direction of the portions of the fitting lower wall surface of each block corresponding to the left and right sliding contact parts that are not bonded to the lower surface of the tension band, Set to the radius of curvature of the tension band.

Furthermore, the sliding contact portion of each of the blocks is formed wider than other portions.

(Function) With this configuration, in the present invention, each block and tension band are integrally adhesively fixed by a block holding part in the center of the belt, and the block holding part has a concave groove extending in the width direction of the belt. Since a shaped cog portion is formed, when the belt is bent along the belt groove of the pulley, the block holding portion is elastically deformed at the cog portion, and
No slippage occurs at the interface between each block and the tension band in the center of the belt. Therefore, heat generation due to friction between each block, tension band, and block holding portion is suppressed.

On the other hand, on the left and right sides of the belt, although slippage occurs at the interface between each block and the tension band,
This part has a large heat dissipation effect, and there is no cog bottom as a starting point for cracks due to the block holding part, making it difficult for cracks to occur.

Moreover, the radius of curvature in the belt longitudinal direction of the portion of the fitting lower wall surface of each block that is not bonded to the lower surface of the tension band is set to the radius of curvature of the tension band when the belt is bent to the minimum radius of curvature. Therefore, the load in the lower direction of the belt (toward the center of the pulley) due to the tension in each tension band can be evenly received on the upper surface of the lower part of each of the above blocks, and the tension distribution in the longitudinal direction of the belt can be made uniform. This makes it difficult for local stress concentration and strain deformation to occur in the cord of the tension band, thereby suppressing the occurrence of cracks in the tension band. Therefore, by suppressing heat generation due to such slippage and making it difficult to generate cracks,
This means that the life of the belt can be improved.

Furthermore, since the sliding contact portions of each of the blocks are formed wider than the other portions, a gap is created between adjacent blocks, and resin, etc., which will become the block holding portion, is formed from the gap by injection molding or compression molding. Even if a method of pouring and bonding the two blocks is adopted, the wide sliding contact portions on the left and right sides ensure a large overall contact area between the belt and the belt groove surface of the pulley, while also reducing the gap between the blocks. Each block can be effectively adhesively secured to the tension band.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. The basic structure of the V-belt according to this embodiment is the same as that explained with reference to FIG. 9, so the same reference numerals are used for the same parts as in FIG. 9.

The V-belt A according to the embodiment of the present invention is shown in FIG.
As shown in Figures 3 to 6, basically rubber,
A core wire 1a is placed inside a shape-retaining layer 1b made of urethane rubber, etc.
Tension bands 1, 1 consisting of a pair of endless flat belts in which 1a, . A large number of blocks 2,
2,... and a block holding part 5, which is disposed between the adjacent blocks 2 and 2 and integrally adhesively fixes each block 2 to the tension band 1 at its left and right intermediate parts.
Each block 2 is fixed in the longitudinal direction of the belt by fitting the tension bands 1, 1 into the left and right fitting portions 2a, 2a of each block 2, respectively.

As shown in FIG. 2, each of the above blocks 2 is
It has a pair of flange parts 3b, 3b wider than the main body 3a at the intermediate position on the left and right side parts, and the flange parts 3b, 3b are inclined in a tapered shape so as to converge toward the belt downward direction. A trapezoidal plate-shaped reinforcing member 3 is set to have the same size as each flange portion 3b of the reinforcing member 3, and the flange portions 3 on both left and right sides are
It consists of a pair of sliding contact members 4, 4 integrally joined to the side surfaces of b and 3b, respectively. Therefore, as shown in the figure, when the blocks 2, 2, ... are arranged side by side, the reinforcing members 3, 2 of the adjacent blocks 2, 2,
A gap G is formed between the intermediate portions of 3, that is, between the main bodies 3a, 3a. In this embodiment, each flange portion 3b of the reinforcing member 3 and the sliding member 4 joined to the flange portion 3b constitute a sliding portion as referred to in the present invention. Therefore, this sliding contact portion (reinforcing member 3
Each flange portion 3b and sliding contact member 4) are provided wider than other portions.

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. It is made of 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 block holding portion 5 has tension bands 1, 1
It has an upper side part 5a located above and a lower side part 5b located below, and these upper and lower side parts 5a, 5
b are integrally connected by a connecting portion 5c extending vertically between the left and right tension bands 1,1. In addition, the block holding part 5 has groove-like grooves extending in the belt width direction on the opposite side to the tension band 1, that is, on the upper surface of the upper part 5a and the lower face of the lower part 5b. Cog portions 5d and 5e are formed.

In addition, when each block 2 is adhesively fixed to each tension band 1 by each block holding part 5, for example, the left and right tension bands 1, 1 are fitted into the left and right fitting parts 2a, 2a of each block 2, respectively. After each block 2 is continuously locked in the longitudinal direction of the belt, resin or rubber is poured into the gap G between the reinforcing members 3, 3 of the adjacent blocks 2, 2 by injection molding, compression molding, etc. A manufacturing method for forming the holding portion 5 is adopted.

Further, on the lower wall surface of each fitting portion 2a of each block 2, the belt length of a portion corresponding to the flange portion 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.

Therefore, in this embodiment, the flange portions 3b, 3b of the reinforcing member 3 of each block 2
The main bodies 3a other than the tension bands 1, 1 are integrally adhesively fixed to the tension bands 1, 1 by a block holding part 5 at the center of the belt A, and each of the block holding parts 5 has a concave groove shape extending in the width direction of the belt. Since the cog portions 5d and 5e are formed, as shown in FIGS. 7 and 8, even if the V-belt A is bent along the belt groove of the pulley, the cog portions of each block holding portion 5 are formed. Only the portions 5d and 5e are elastically deformed, and no slippage occurs at the interface between each block 2 and each tension band 1 in the central portion of the belt A. For this reason, each block 2, tension band 1,
Heat generation due to friction between the block holding parts 5 can be suppressed.

In addition, in the left and right side portions of the belt A, each flange portion 3b of the reinforcing member 3 of each block 2 is
Since the sliding contact member 4 is not adhesively fixed to the tension band 1, slippage occurs at the interface between the two. However, since those parts are the left and right sides of belt A,
Great heat dissipation effect. Moreover, since the block holding part 5 is not arranged in that part, there is no cog bottom as a starting point for a crack, and thus the occurrence of a crack can be suppressed.

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 the tension band 1 when it is bent to the minimum radius of curvature, so as shown in Figure 7, the load in the belt downward direction (toward the center of the pulley) due to the tension in each tension band 1 is F can be received evenly on the upper surface of the lower side of each block 2, and the tension distribution in the longitudinal direction of the belt A can be made uniform. For this reason,
By suppressing the occurrence of local stress concentration and strain deformation in the core wire 1a of the tension band 1, it is possible to more effectively suppress the occurrence of cracks in the tension band 1. Therefore, as described above, heat generation due to slipping at the interface between each block 2 and the tension band 1 is suppressed, and the tension band 1
By making it more difficult to generate cracks, the high-speed durability of the V-belt A can be increased and its lifespan can be extended.

In addition, since the left and right side portions of each block 2 formed by the respective flange portions 3b of the reinforcing member 3 or the sliding contact member 4 are formed wider than other portions, each block 2 is bonded to the tension band 1. For fixing, reinforcing members 3, 3 of adjacent blocks 2, 2
While securing the gap G for forming the block holding part 5 by pouring resin or rubber between the pulleys and the belt groove surface, the overall contact area of the pulley with the belt groove surface is increased, and the force is reduced between the pulley and the belt groove surface. Transfers can be made reliably.

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

(Effects of the invention) As explained above, according to the 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. The block is bonded and held continuously in the longitudinal direction of the belt, and a concave groove-shaped cog portion extending in the belt width direction is formed on the side surface opposite to the tension band of the block holding portion, and the fitting lower part of the left and right side portions of each block is formed. The radius of curvature of the wall surface is set to the radius of curvature of the tension band when the belt is bent to the minimum radius of curvature, and the sliding part of each block is made wider than the other parts, so that the belt bends easily. Even when the belt is stretched, the elastic deformation of the cog part of the block holding part prevents slippage at the interface between each block and the tension band in the center of the belt, suppressing heat generation. By equalizing the load in the downward direction of the belt due to the tension in each tension band, the tension distribution in the longitudinal direction of the belt can be made uniform, making it difficult to generate cracks, increasing the high-speed durability of the V-belt, and improving its performance. Lifespan can be improved. Furthermore, since the sliding contact part of each block is formed wider than other parts, even when bonding the block and the tension band through the gap between adjacent blocks by injection molding or compression molding, the above-mentioned wide part can be used. The left and right sliding contact portions ensure a large overall contact area between the belt and the belt groove surface of the pulley, and each block can be effectively adhesively fixed to the tension band.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view partially showing a V-belt, FIG. 2 is a perspective view of a block, FIG. 3 is a side view of the V-belt, and FIG. 4 is a plan view thereof. , Fig. 5 is a sectional view taken along the line - - of Fig. 1, Fig. 6 is a sectional view taken along the same line, Fig. 7 is a view equivalent to Fig. 3 showing the state in which the V-belt is bent to the minimum curvature, and Fig. 8 is a sectional view taken along the - line in Fig. 1. This is a diagram equivalent to Figure 5. FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional example. A... V-belt, 1... Tension band, 1a... Core wire, 2... Block, 2a... Fitting part, 3b...
Flange portion, 4... Sliding member, 5, 6... Block holding portion, 5a, 6a... Cog portion, r... Radius of curvature.

Claims (1)

[Scope of utility model registration request] A pair of tension bands made of an endless flat belt with a core wire embedded therein, and a pair of notch-shaped fitting parts on the left and right sides of each of the tension bands to fit each tension band from the width direction thereof, and a large number of blocks having sliding contact portions on the left and right sides for sliding contact with the groove surfaces of the pulleys, and disposed between the adjacent blocks, each block being bonded to the tension band at the left and right intermediate portions excluding the sliding contact portions. Each block is bonded to each tension band by the block holding part and fixed in the longitudinal direction of the belt, and the block holding part has a belt on the upper and lower surfaces opposite to the tension band. A concave groove-shaped cog portion extending in the width direction is formed, and the radius of curvature in the belt longitudinal direction of the portion corresponding to the sliding contact portion on the lower wall surface of each fitting of each block is such that the belt is bent to the minimum radius of curvature. The V-belt is set to have a radius of curvature of the tension band when the belt is bent, and further, the sliding contact portion of each of the blocks is formed wider than other portions.