JPH0518515Y2 - - 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, the present applicant also has published Japanese Patent Application Laid-Open No.
As shown in the publication, a V-belt for high-load transmission is proposed. That is, this product is basically made of rubber, etc., in which a plurality of core wires 2, 2, ... (core bodies) are arranged in parallel and buried, as shown in FIGS. 3 to 6, for example. a pair of endless tension bands 1, 1, and a large number of blocks 3 having cutout-like fitting parts 4', 4' on the left and right sides into which each tension band 1 is removably fitted from the width direction. ,3,...
This is a V-belt in which the blocks 3, 3, . . . are continuously fixed in the longitudinal direction of the belt by fitting the tension bands 1, 1 into the fitting portions 4', 4' of each block 3, respectively.

In this proposed V-belt A', the grooves 5, 5, . , . . . corresponding to the grooves 6, 6, . The protrusions 7 and 8 of each block 3 are formed on the lower surface of the fitting part 4' to fit into the grooves 6 on the lower surface of the tension band 1, respectively. Concave grooves 5 and 6 in tension band 1
The blocks 3, 3, . . . are engaged with and fixed in the longitudinal direction of the belt.

(Problems to be Solved by the Invention) In this device, each block 3 is made of a high modulus material such as plastic or hard rubber in order to increase the lateral pressure against the pulley. Therefore, although the transmission capacity of belt A' is extremely large, since it is a tension-type block belt, each tension band 1 is twisted in the twisting direction and winding direction of its core wires 2, 2, etc., as shown in Fig. 5. This causes movement in the belt width direction. Due to this movement of the tension band 1, the outer surface 1a of the tension band 1 corresponding to the belt side surface and the inner surface 1b of each block 3 on the center pillar 3a (portion between the fitting parts 4', 4') side are Uneven wear occurs, and the core wire 2 at both the inner and outer ends,
2 fatigues early and eventually breaks.

Furthermore, after the belt A' has been run to some extent, looseness occurs due to gaps at the fitting portions between the tension band 1 and each block 3 (the upper and lower portions of the fitting portion 4' of each block 3). If there is a sudden deceleration between the variable speed pulleys, for example from a high-speed ratio state to a low-speed ratio state, there will be a delay in the movement of belt A' toward the center of the pulley relative to the opening speed of the belt groove of the drive pulley, and belt A' There may occur a portion where the tensile force is instantaneously lost, and at that time, there is a risk that the block 3 may slip out of the tension band 1 due to the above-mentioned procedure. Therefore, in consideration of this phenomenon, there is room for further improvement.

This invention was made in view of these points,
The purpose of this is to appropriately improve the shape of the fitting part of each block into which the tension band is fitted, thereby regulating the movement of the tension band within the fitting part of each block. The object is to be able to stably and firmly lock onto the block.

(Means for solving the problem) In order to solve this problem, the solving means of the present invention makes the shape of the fitting lower surface of each of the blocks arched along the width direction of the belt.

That is, the present invention consists of a pair of endless tension bands in which the core wires are embedded, and a large number of blocks having fitting parts on the left and right sides to which each of the tension bands is removably fitted from the width direction. On the upper surface of each of the tension bands, grooves with a constant pitch extending in the width direction are formed in the portion corresponding to each block, while on the upper surface of the fitting portion of each block there are grooves that fit into the grooves of the tension band. The present invention is based on a V-belt in which matching protrusions are formed and each block is locked and fixed in the longitudinal direction of the belt by fitting the protrusions into the grooves of the tension band.

The upper or lower surface of the fitting portion of each of the blocks is formed in a convex shape along the width direction of the belt.

(Function) With this configuration, in the present invention, the upper surface or lower surface of the fitting portion of each block is formed in a convex shape along the belt width direction, so that the tension band is pinched by the convex shape. The movement of the tension band in the belt width direction is suppressed, and uneven wear of both the inner and outer ends of the tension band is suppressed, thereby effectively preventing the cords located on the sides of the tension band from breaking due to early fatigue.

Moreover, since the movement of the tension band is suppressed in this way, even if there is some play in the locking part between the block and the tension band, the block of the tension band can be moved even if there is no tension on the running belt. This makes it possible to reliably avoid being extracted from the system.

(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 FIGS. 3 to 6, so the same parts as in FIGS. 3 to 6 are denoted by the same reference numerals.

As shown in FIGS. 1 and 2, the V-belt A according to the embodiment of the present invention has core wires 2, 2,...
A pair of endless tension bands 1, 1 in which
and a large number of blocks 3, 3, . . . each having fitting portions 4, 4 on the left and right sides into which each tension band 1 is removably fitted from the width direction.

On the upper surface of each of the tension bands 1, grooves 5, 5, . The upper surface 4a (ceiling surface) is formed with a protrusion 7 that fits into each groove 5 of the tension band 1, and each block 3 connects the protrusion 7 with the tension band 1.
It is fitted into a corresponding groove 5 on the top surface and is locked and fixed in the longitudinal direction of the belt. Further, on the lower surface of each tension band 1, grooves 6, 6, . bottom)
A protrusion 8 is formed to fit into each groove 6 on the lower surface of the tension band 1.

Further, as a feature of the present invention, the lower surface 4b of each of the left and right fitting portions 4 of each block 3 is arranged such that the center portion thereof in the belt width direction is higher than the other portions (left and right side portions). It is formed in an arch shape (medium convex shape) along.

Therefore, in this embodiment, since the lower surface 4b of each fitting part 4 of each block 3 of the V-belt A is formed in an arch shape along the belt width direction, the fitting part 4 of this block 3 Movement of each tension band 1 fitted in the belt width direction is suppressed.
Therefore, uneven wear of both the inner and outer ends of each tension band 1 is suppressed, and it is therefore possible to effectively prevent the core wires 2, 2 located on the sides of the tension band 1 from breaking due to early fatigue. .

In addition, in this way, the movement of tension band 1 is blocked by block 3.
Since this is suppressed by the shape of the lower surface 4b of the fitting portion 4 of Even when the running belt A temporarily loses its tension due to a delay in movement, etc., the tension band 1 can be reliably fitted and held in the fitting part 4 of the block 3, and the tension band 1 can be It is possible to stably and firmly lock each block 3. Therefore, the life of the V-belt A can be extended.

Incidentally, in the above embodiment, the fitting portion 4 of each block 3
Although the lower surface 4b has an arch shape along the belt width direction, other convex shapes may be adopted.

Further, not only the lower surface 4b of the fitting portion 4 of each block 3, but also the upper surface 4a or both upper and lower surfaces 4a, 4b may be formed into a convex shape.

(Effects of the invention) As explained above, according to the invention, a large number of blocks are arranged in a pair of endless tension bands having core wires, and the convex strips in the width direction on the top surface of the fitting part are fixed on the top surface of the tension band. For a V-belt for high-load transmission, which has a structure in which the belt is continuously locked in the longitudinal direction of the belt by engaging with the concave groove of the pitch, By forming the tension band into a convex shape, it is possible to suppress the movement of the tension band in the belt width direction, effectively preventing breakage due to early fatigue of the core wire located on the side of the tension band, and also to prevent the tension band from breaking due to early fatigue. Even if there is a certain degree of play in the locking part, the tension band can be reliably prevented from coming out of the block when the belt is running without tension, and the durability of the V-belt can be greatly improved. This makes it possible to extend the lifespan.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a sectional view taken along the line -- in FIG. 2, and FIG. 2 is a perspective view of the V-belt. Figure 3 and the following drawings show conventional examples, Figure 3 is a view equivalent to Figure 2, Figure 4 is a side view of the V-belt, and Figures 5 and 6 are respectively
It is - line and - line sectional view of a figure. A... V-belt, 1... Tension band, 3... Block, 4... Fitting part, 4b... Bottom surface, 5... Concave groove,
7...Protruding stripes.

Claims (1)

[Scope of utility model registration request] It consists of a pair of endless tension bands in which core wires are embedded, and a large number of blocks having fitting parts on the left and right sides to which each of the tension bands can be removably fitted from the width direction. On the top surface, grooves with a constant pitch extending in the width direction are formed in the portion corresponding to each block, while on the top surface of the fitting portion of each block, a protrusion that fits into the groove of the tension band is formed. and each block fits its convex strip into the concave groove of the tension band to lock and fix the V in the longitudinal direction of the belt.
A V-belt, characterized in that the upper surface or lower surface of the fitting portion of each of the blocks is formed in a convex shape along the width direction of the belt.