JPS5916990B2 - Endless band device - Google Patents

Description

[Detailed description of the invention] The present invention relates to endless belt devices such as crawlers.

As is well known, a crawler-type endless belt device circulates an endless belt made of rubber or other elastic material by meshing or frictionally interlocking with sprocket foils, drum foils, etc. The engagement between the intermediate idler wheel and the endless band is likely to disengage, and there is a tendency for the wheel to come off, and the embedded core metal that has a claw for securing it to the drive wheel may be deformed or broken, etc. There are many problems.

To explain this with reference to FIG. 1, A is the endless band main body, B is the tension-maintaining cord layer, C is the embedded core metal, and the concentric metal C is the cord layer B of the endless band main body A. In the upper region, a pair of retaining claws of the core metal C are embedded at predetermined intervals in the longitudinal direction of the band and protrude toward the side opposite to the ground surface.

According to the conventional example shown in FIG. 1, the driving wheel is formed by forming an engaging hole on the drum peripheral surface that engages with a pair of engaging claw pieces, or by forming a hollow hole with a row of bars that engage with the claw pieces. The idler wheel is a rolling wheel with a circumference that fits between the claw pieces as shown by the symbol E, and the idler wheel shown by the symbol F has a concave circumferential groove that engages across the claw pieces. It has a drum shape with G.

Therefore, according to this example, apart from the driving wheel, the idle wheel E1
Both freewheels F tend to come off easily, and smooth rotation is not guaranteed due to the difference in peripheral speed between the freewheels E and F, and furthermore, the engaging claw pieces are often deformed and the core metal C is easily broken. However, breakage or deformation of the claw pieces may lead to poor engagement with the drive wheels, making it virtually impossible to drive.

Therefore, if the durability of the core metal C1, especially the nail piece, is improved, the excessive weight will be reduced, and since there are a plurality of core metals C, the total weight will be large.

As a result of intensive research to eliminate the problems of the previous example, the inventor of the present invention aimed to prevent wheel derailment, reduce the weight of the endless belt, and improve the riding performance and soil removal performance with good riding comfort. Therefore, in the present invention, the center part of the endless band is made into a central recessed part having a gutter-shaped cross section extending in the longitudinal direction toward the grounding side of the endless band, and the longitudinal direction of the endless band is The core metals embedded in rows at regular intervals over the direction have a bridge-shaped recess portion that faces the inner surface of the central recess portion in a fitted manner, and are engaged between the bottom walls of the core metals in the central portion of the endless band. A sprocket-like driving wheel is provided in which holes are arranged in rows and meshes with the meshing hole, and at least one of an idler wheel corresponding to the drive wheel and an intermediate idler wheel provided between the drive wheel and the idler wheel is connected to the endless band. It is formed of a central body facing the central concave part and not in contact with the bottom surface of the core metal, and a pair of side body parts contacting and supporting the endless band surface continuing on both sides of the central concave part. A protrusion having a trapezoidal cross section extending over the entire circumference in the longitudinal direction of the band is integrally formed on both shoulders of the central recessed portion, and reinforcing portions of the protrusion are formed on both shoulder portions of the central recessed portion of the core metal,
A pair of embedded parts extend outward through the reinforcing part, and a tension-maintaining cord layer is embedded between the embedded parts and the bottom wall of the central recessed part of the core metal over the entire circumference in the longitudinal direction of the band. It is characterized by

The present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 1 shows an example of the use of the endless belt according to the present invention, where 1 is the endless belt, 2 is a driving wheel, 3 is an idler wheel, and 4 is an intermediate idler wheel.

The endless band 1 is made of rubber or other elastic material, has lugs 5 formed on its ground surface, and has a tension-maintaining cord layer 6 embedded therein in the longitudinal direction.

The endless band 1 is provided with concave portions I having a gutter-shaped cross section, such as a U-shape, extending in the longitudinal direction at a constant interval in the longitudinal direction of the endless band 1. A core metal 8 is embedded in the direction of the middle part 1.

The concentric bar 8 has a bridge-shaped recessed part 8' formed in the center thereof, which faces the inner surface of the central recessed part 1 of the endless band 1 in a fitted manner. The inner surfaces 9', 9' of the side walls 9, 9 and the bottom wall 10 are either exposed on one side of the recessed portion or covered with a slight film.

That is, the inner surface 9', 9'! The inner surface r/ of the central recessed part 1,
r/ or slightly covered with a membrane, the bottom wall 10 is exposed across the inner surface 1', γ in the form of a bridge.

Note that the lugs 5 may be divided into two on the lower surface of the recessed portion 1, or may be split into two, but in this embodiment, each lug 5 has at least a portion within the projection area of the core bar 8- as shown in the second figure. It is located like this.

Further, in the present invention, the core metals 8 are embedded at regular intervals in the longitudinal direction of the band, and the recesses 8' are located in the central recess 1 of the endless band 1, and the bottom wall 10 crosses each bottom wall. io, io
A meshing hole 11 is formed in between in the shape of a window hole, thereby forming the drive wheel 2 in the shape of a sprocket foil, and each tooth 12 formed on the circumferential surface of the driving wheel 2 is formed in the meshing hole 11.
The endless band 1 is driven by meshing with the two.

The bottom wall 10 of the core bar 8 is located lower toward the ground side than the cord layer 6 of the endless band 1, and in the embodiment shown in FIG. The ground plane 10 of 10 is located approximately on the same plane as the ground plane 1' of the band main body, and in the embodiment shown in FIG. In the embodiment shown in FIG. 6, the cord layer 6 and the anti-ground surface of the core bottom wall 10 are located on substantially the same plane.

On the other hand, the other idler wheel 3 corresponding to the drive wheel 2 is located in the central recess I of the endless band 1, and has an idler between the recess T and both side walls 9, 9 of the core bar 8 in the recess 7. There is a gap, and the bottom wall 1
The center body 13 has a size such that there is a clearance 1 between the center body 13 and the center body 13, and the center body 13 has a diameter that is smaller than that of the body 13 on both sides of the center body 13. In a pair of embodiments in which the shoulder portions on both sides protrude in the opposite direction to the grounding side, the left and right side body portions 14, 14 are connected and supported on each top surface 15' of the rail-shaped protrusion 15, and the middle The idler wheel 4 has exactly the same structure, but its shape is smaller in diameter than the idler wheel.

In addition, any one of the side body portions 14 of the idler wheel 3 and the plurality of intermediate idler wheels 4 between the drive wheel 2 and the idler wheel 3 is in contact with at least the surface of the endless band continuing into the central recessed portion.

In other words, the top surface 151 of the pair of protrusions 15 formed at both shoulders of the central recessed portion 1, that is, the wheel passing portion, is in contact with the body portion 14 on this side, as shown in FIGS. 4 to 6. Since the protrusion 15 is formed as shown in FIG.

When the pair of protrusions 15 are formed as protrusions, this protrusion 15
Therefore, in the basic example shown in FIG. 3-4, the embedded part 18 extending from both side walls 9 of the core bar 8 toward the inner part is inserted into the cord layer 6 through the reinforcing part 18a, which is bent into a trapezoidal shape. It is embedded in the endless band 1 in the upper region.

The cord layer 6 is located between the embedded portion 18 and the bottom wall of the recessed portion of the core metal, and is embedded over the entire circumference in the longitudinal direction of the band.

In addition, FIG. 5 shows the case for heavy load, and the reinforcing part 18 of the core bar 8
A specific example is shown in which a is curved, and FIG. 6 shows a case for heavy loads, and the difference is that the reinforcing portion 18a is thick.

The endless belt device comprising the endless belt 1, its driving wheel 2, idler wheel 3, and intermediate idler wheel 4 according to the configuration of the present invention provides the above-mentioned advantages.

In other words, the endless belt 1 circulates through the bottom wall io of the recess 8' of the embedded mandrel 8, which is formed at the bottom of the central recess 1 of the endless belt 1.
When the meshing teeth 12 of the driving wheel 2 mesh with the meshing hole 11 partitioned by the The engagement between the teeth 12 of the drive wheel 2 and the meshing hole 11 is always reliable, although this is done by friction caused by contact with the top surfaces 15' of the pair of protrusions 15 formed on both shoulders of the entry part 1. Moreover, since the teeth 12 enter into the central recessed portion 7 and engage with each other, there is no possibility that the attachment will become uncertain due to vibration shock or the like.

In addition, on the side of the idler wheels 3 and idler wheels 4 where derailment is likely to occur, the central body portion 13 that enters the central recessed portion 1 with a clearance 1,
It is located at the center of the side body portion 14°14 that performs friction transmission, and forms a protrusion 15, so the height of the protrusion is the same as the depth of the central recess 1, so it can be completely removed. Block the wheel.

At this time, each protrusion 15 is reinforced by the reinforcing part 18a of the core bar 8, so even if the protrusion 15 is made of an elastic material integrated with the cover, its durability is improved. It also has excellent vibration absorption performance due to its elastic properties.

Further, according to this embodiment in which the bottom wall 10 of the recessed portion 8 of the embedded core bar 8 is located lower than the cord layer 6 toward the grounding side, the central body portion 13 is also naturally lower than the cord layer 6. Therefore, when the endless belt 1 is wrapped between the two wheels 2 and 3 as shown in FIG. Both wheels 2 than the outer circumferential surface
, 3. In this embodiment, in order for the endless belt 1 to come off the wheel, the distance between the axes between the two wheels 2 and 3 must become small, or unless the cord layer 6 breaks, the endless belt 1 must come off the wheel. become.

In the conventional model shown in Fig. 1, both the idler wheel E and the idler wheel F are located inside the cord layer B on their outer circumferential surfaces, and therefore closer to the center of both wheels, which is more likely to cause wheels to come off. There is.

Furthermore, in the direction of the middle part of the endless band 1, the central body part 13 is inserted into the central recess T, so even if rocking occurs, the inner surfaces of the recesses 7 and 8 on both outer surfaces of the body part Since the height of this prevention is increased by the height of the pair of protrusions 15, the prevention of derailment is complete.

At this time, if both side walls 9' and 9' of the core bar are left exposed, even if the circumferential surface of the center body part 13 rides on it, it will immediately slide off, so that it is possible to ensure prevention of derailment, and also to ensure that the body part 13 Since the circumferential surface and the circumferential side surface have a clearance with the recessed portions 1 and 8',
In the normal case, since it is spaced apart from the meshing hole 11, it is also effective in preventing vibrations and the like.

Moreover, since the central recessed part 1 of the endless band 1 is reinforced and shaped by the recessed part 8' of the core bar 8, the shape of this recessed part 1 may be deformed, and the central body part 13 may rise or climb over it. There is no possibility that this will happen.

In addition, this allows the left and right side body parts 14, 14 to more reliably contact and transmit power with the top surface 15' of the protrusion 15 on the opposite side to the grounding side of the endless band 1.

Further, the core bar 8 does not require any protrusions such as claw pieces as in the prior art, so the structure is simple and lightweight, and the endless band 1 as a whole can be easily manufactured at a low weight and cost.

And since the running surface other than drive wheel 2 runs on a flat surface,
The riding comfort is extremely good, and since the contact surfaces of the idler wheels 3 and the endless belt 1 are integrally formed as a pair of protrusions 15, it is possible to prevent the wheels from coming off. The protruding portion 15 is reinforced by the reinforcing portion 18a of the core bar 8 to ensure appropriate elastic deformation while preventing extreme elastic deformation.Furthermore, soil removal performance is improved and riding comfort is further improved. It is superior in terms of reliable running, complete prevention of wheels falling off, and good ride comfort.

Furthermore, since the center body portion 13 and the side body portions 14 have different circumferential speeds, if there is no play, either one will slip, which does not guarantee smooth rotation and also causes resistance.

In this respect, in the present invention, since the central body part 13 is unsupported, smooth rotation is ensured even if there is a difference in circumferential speed. Contact transmission can be made more reliable.

Furthermore, since the tension-maintaining cord layer 6 is located between the bottom wall of the recessed part of the core bar 8 and the embedded part 18 and is embedded over the entire circumference in the longitudinal direction of the endless band 1, the endless band 1 is The embedded portion 18 reliably supports the load received from the portion 14 through the cord layer 6, and when driving the driving wheel 2 into engagement with the meshing hole 11, the core bar 8 is rotated in the tangential direction of the driving wheel 2. The embedded portion 18 of the core bar 8 is firmly supported through the cord layer 6 against the tensile force pulled in the outer circumferential direction.
is not peeled off to the ground side of the endless band 1.

Therefore, it has a wide range of uses including agricultural machinery and work vehicles.

[Brief explanation of drawings]

Fig. 1 is an overall side view of an embodiment of the present invention, Fig. 2 is a plan view of the same endless band, Fig. 3 is a sectional view of the same essential parts, and Figs. 4 to 6 are cross sections of a modified embodiment of the core metal. 7 are explanatory diagrams of a conventional example. 1...Endless band, 2...Drive wheel, 3...
...Idle wheel, 4...Idle wheel, 5...
- Lug, 6... Cord layer, I... Center recess, 8... Embedded core metal, 8'... Core metal recess, 9 ......Side wall, 10...Bottom wall, 11...Matching hole, 13...Central body part, 14......Side body part.

Claims (1)

[Claims] 1. The center part of the endless strip is a central recessed part with a gutter-shaped cross section extending longitudinally toward the grounding side of the endless strip, and the recesses are embedded in rows at regular intervals along the longitudinal direction of the endless strip. The core metal has a bridge-shaped recess that faces the inner surface of the central recess, and meshing holes are arranged in a row between the bottom walls of the core metal in the central part of the endless band. A sprocket-like drive wheel that meshes is provided, at least one of an idler wheel corresponding to the drive wheel and an intermediate idler wheel provided between the drive wheel and the idler wheel faces the central recessed part of the endless band, and a core metal It is formed by a pair of side trunks that connect and support the endless band surface that continues on both sides of the central recessed part with a central body part that is not in contact with the bottom surface. A protrusion having a trapezoidal cross section extending all around the circumference is integrally formed, reinforcing portions of the protrusion are formed on both shoulders of the central recessed portion of the core metal, and a pair of embedded portions extends outward through the reinforcing portion. What is claimed is: 1. An endless belt device, characterized in that a tension-maintaining cord layer is embedded over the entire circumference in the longitudinal direction of the band and located between the embedded portion and the bottom wall of the central recessed portion of the core bar.