JPS5817073B2 - Endless traveling drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of endless traveling drive devices such as crawlers.

As is well known, a crawler-type endless traveling drive device circulates an endless band made of rubber or other elastic material by meshing or frictionally interlocking with sprocket foils, drum foils, etc. Also, the engagement between the intermediate idler wheel and the endless band is likely to disengage, and the wheels tend to come off easily. In addition, the embedded core metal having the claw for engagement with the drive wheel may be deformed or broken. There are many problems.

To explain this with reference to FIG. 5, 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 engaging claws of the core metal C are embedded at predetermined intervals in the band longitudinal direction, and protrude toward the side opposite to the ground surface.

According to the conventional example shown in FIG. 5, the driving wheel is formed by forming an engaging hole on the drum circumferential 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 the idler wheels F are easily dislocated, and deformation of the engaging pawl piece and breakage of the core bar C are problems, and breakage and deformation of the pawl piece lead to poor engagement with the drive wheel, resulting in substantial damage. There is a risk that it may become impossible to drive.

Therefore, if the durability of the core metal 01, especially the nail piece, is improved, the weight will be excessive, and since there are a plurality of core metals C, the total weight is large.

As a result of intensive research to eliminate the problems of the previous example, the inventor of the present invention improved the shape of the endless belt main body, and worked with the core metal to reliably prevent wheel derailment. The company succeeded in providing an endless running drive device that promises to reduce the weight of the belt and suppress vibrations.

The present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows the entire endless traveling drive device, in which 1 is an endless band, 2 is a drive wheel, 3 is an idler wheel, and 4 is an intermediate idler wheel. It is.

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 7 extending in the longitudinal direction and having a gutter-shaped cross section such as a U-shape. A core metal 8 is embedded in the width direction of 1.

The concentric bar 8 has a recessed part 8' having substantially the same shape as the central recessed part 7 of the endless band 1 in its center, and preferably, in the central recessed part 7, both side walls 9 of the recessed part 8', The inner surfaces 9', 9' and the bottom wall 10 of the recessed portion 7 are exposed to the surface of the recessed portion 7.

That is, the inner surfaces 9', 9' are the inner surfaces γ', 7' of the central recessed part 7.
The bottom wall 10 is exposed on the same plane as the inner surface 7' in a bridge shape.
, 7' are exposed.

The lug 5 may be divided into two parts by the lower surface of the recessed part γ, or it may extend over the entire width, 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. positioned.

Further, in the present invention, the core metal 8 is embedded at regular intervals in the longitudinal direction of the band, and the recess 8' is located in the recess 7 in the center of the endless band 1, and the bottom wall 10 crosses each bottom. wall 10,1
A meshing hole 11 is formed in the shape of a window between the holes 1 and 2, thereby forming the drive wheel 2 in the shape of a sprocket foil.
By meshing with 1, this endless band 1 is driven.

Furthermore, the position of the bottom wall 10 of the core metal 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.

Qualitatively, the ground plane 10' of the bottom wall 10 is the ground plane 1 of the band main body.
′ is located approximately on the same plane.

On the other hand, the other idler wheel 3 corresponding to the driving wheel 2 is arranged in the central recessed part γ of the endless band 1, along with the recessed part 7 and the side walls 9, 9 and the bottom wall 10 of the core metal 8 in the recessed part γ.

A central body portion 13 having a play space and having an outer circumferential surface that extends closer to the ground surface than the cord layer 6;
In this embodiment, a pair of rail-shaped protrusions are provided on both sides of the endless band 1 that protrude to a smaller diameter than the body 13 and whose circumferential surfaces protrude from both shoulder parts of the central recessed part 7 of the endless band 1 in the direction opposite to the ground contact side. Part 1
The left and right side body parts 14.14 are placed on each top surface 15' of 5.
The intermediate idler ring 4 has exactly the same structure, but its shape is smaller in diameter than the idler ring.

A pair of protrusions 15 formed at both shoulders of the central recessed portion 7, that is, at the wheel passing portion, have a trapezoidal cross-sectional shape in the embodiment and extend along the longitudinal direction of the band, and the endless band is formed here. 1
The recess depth of the central recessed part 7 is smaller than that of the case where the protrusion 15 is not formed.

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

The operation of the embodiment of the present invention will be explained.

In other words, the endless belt 1 circulates through the bottom wall 10 of the recess 8' of the embedded mandrel 8, which is formed at the bottom of the central recess 7 of the endless belt 1.
When the meshing teeth 12 of the driving wheel 2 mesh with the meshing hole 11 partitioned by 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 the liquid drop with each top surface 15' of the pair of protrusions 15 formed on both shoulders of the entry part 7. However, since the tooth 12 enters into the central recessed portion 7 and engages with it, there is no possibility that the engagement becomes uncertain due to vibration shock or the like.

In addition, on the side of the idler wheels 3 and 4 where wheel derailment is likely to occur, the central body portion 13 that enters the central recessed portion 7 with a clearance is located at the center of the side body portions 14 and 14 that perform frictional transmission. However, since the height of the protrusion 15 is the same as the depth of the central recess 7, derailment is completely prevented.

At this time, each protrusion 15 is reinforced by the reinforcing part 18a of the core metal 8, so even if the protrusion 15 is made of an elastic material integrated with the crawler track, its durability is improved, and its elasticity is improved. It also has excellent vibration absorption performance.

Further, the bottom wall 10 of the recessed part 8' of the embedded core metal 8 is connected to the cord layer 6.
According to this embodiment, the center trunk portion 13 is also located deeper toward the ground contact side than the cord layer 6, and therefore, as shown in FIG. Endless band 1
In this embodiment, the cord layer 6, which is the center of curvature on the bending surface of the endless belt 1, is located closer to the center of the wheels 2 and 3 than the outer peripheral surface of the central trunk 13. Obi 1
In order for the wheel to come off the wheel, the distance between the axes between the two wheels 2 and 3 becomes small, but unless the cord layer 6 breaks, the wheel will not come off the wheel.

In the conventional model shown in Fig. 5, both the idler wheel E and the idler wheel F are located inside the cord layer B on their outer peripheral surfaces, and therefore closer to the center of both wheels, which is more likely to cause wheels to come off. There is.

In addition, in the width direction of the endless band 1, the central trunk 13 is inserted into the central recess γ, so that even if swinging occurs, the inner surfaces of the recesses 7 and 8' on both outer surfaces of the trunk Since the height of this prevention is added to the height of the pair of protrusions 15, the prevention of derailment is perfect.

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 7 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.

Furthermore, since the central recessed portion 7 of the endless band 1 is reinforced and shaped by the recessed portion 8' of the core bar 8, the shape of this recessed portion 7 may be deformed, causing the central body portion 13 to rise or climb over. 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 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.

In addition, since the running surfaces of all wheels other than 1 drive wheel 2 run on a flat surface, the ride comfort is extremely good. 1
5, the soil removal performance is improved and the riding comfort is further improved, which is excellent in reliable running, complete prevention of wheel derailment, and good riding comfort.

As described above, the present invention is advantageous in that it is possible to reliably prevent wheels from coming off and to suppress vibrations, so it is very useful as an endless traveling drive device for agricultural machinery and work vehicles.

[Brief explanation of the drawing]

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 main part, Fig. 4 is a front sectional view of the main part, and Fig. 5 is a conventional example. FIG. 1...Endless band, 2...Drive wheel, 3...
...Idle wheel, 4...Idle wheel, 5...
- Lug, 6... Cord layer, 7... Center recess, 8... Embedded core metal, 8'... Core metal recess, 9 ...Side wall, 10...Bottom wall, 11...Matching hole, 15...Protrusion, 1
8a...Reinforcement part.

Claims (1)

[Claims] 1 The central part of the endless band is a central recessed part that is recessed in the longitudinal direction toward the grounding side of the endless band and has a trough-shaped cross section, and the core metal with the recessed part that is fitted into the central recessed part is an endless part. The metal cores are embedded in rows at regular intervals in the longitudinal direction of the band, and in the central recessed part of the endless band, engaging holes are provided in a row between the bottom walls of the core metal, and in both shoulders of the central recessed part of the endless band. A bulging protrusion is formed in the rolling wheel passing portion in the direction opposite to the ground contact side, and the embedded portion extends into the main body from the side wall of the core metal via the reinforcing protrusion of the protrusion, and further, A sprocket-shaped drive wheel that is engaged with the meshing hole, an idler wheel that corresponds to the drive wheel, and an intermediate idler wheel that are inserted into the side body part that is lowered into the protrusion and the center recessed part. Further, each of the cord layers embedded in the endless band in the longitudinal direction on the grounding surface side of the embedded portion of the core bar has a center body portion of each of the wheels, and An endless traveling drive device characterized by being located further inward in a radial direction.