JPH0414310Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rubber crawler that is attached to a relatively large-load machine such as a mobile earth construction machine.

(Prior Art) A conventional rubber crawler is shown in FIGS. 1 and 2 (both cross-sectional views in the width direction). In each drawing, 1 is a crawler body, 2 and 2' are core metals embedded at regular intervals in the length direction of the rubber crawler body 1, 3 is a steel cord also embedded in the length direction, 4 and Reference numerals 4' denote an outer roller wheel and a middle roller roller, which are located between the drive wheel and the idler wheel and serve as the weight of the machine body.

FIG. 1 shows an example of a rubber crawler in which a core bar 2 with a pair of protrusions 2a, 2a for preventing derailment is embedded in the center of a rectangular planar member.
The outer wheel 4 is configured to roll on the outer inner peripheral surface of the left and right protrusions 2a, 2a that protrude toward the inner peripheral surface of the crawler body 1.

FIG. 2 shows an example of a rubber crawler using a middle brim roller 4', in which a concave groove V continuous in the center of the width direction of the crawler body 1 is formed in a central trunk 4'a of the middle brim roller 4'. The structure is such that the left and right side bodies 4'b, 4'b, which support the weight of the aircraft, roll on the left and right inner peripheral surfaces of the groove V. It is as follows.

In both figures above, the steel cord 3 is buried close to the outer circumference of the core bar 2 or 2'.
For this reason, the steel cord and each core bar are bonded to each other via a thin rubber layer of the rubber crawler body 1.

Conventional rubber crawlers have the above-mentioned configuration and are mainly used for small-load agricultural machinery such as combine harvesters, and the machine load is directly supported on the inner peripheral surface of the rubber crawler. be.

(Problem that the invention aims to solve) Earth construction machines such as batshoes (hereinafter referred to as construction machines) use caterpillars made entirely of steel because they need to support large loads on uneven ground with lots of rocks. Today, such construction machines are frequently used for excavation work such as land reclamation and water pipe laying in urban areas, and for this reason, when such construction machines are driven into urban areas, steel track pillars are used. The road surface is being severely damaged by this.

For this reason, there is a desire to develop rubber crawlers for construction machinery, but simply increasing the size of the conventional rubber crawler structure will cause various problems for rubber crawlers for construction machinery, such as rolling wheels. If the structure is such that it comes into direct contact with the rubber crawler body,
The rubber material in this part is hollowed out, exposing the core metal inside, and then the core metal peels off and falls off, making it unusable at an early stage.

The present invention is an attempt to solve the above-mentioned problems, and improves the rubber crawler instead of the steel caterpillar so that it can sufficiently withstand heavy loads, so as not to cause any trouble to the work. At the same time, it is designed to prevent damage to the road surface when driving on paved roads.

(Means for Solving the Problems) The present invention is characterized in that an engagement hole into which the tooth tip of the drive wheel is inserted is bored between each engagement part of the core metal embedded in the crawler body, In a rubber crawler in which the upper surface of each protrusion serves as a wheel track, a pair of protrusions is provided facing each other inside the center of a strip-shaped flat member, and between each protrusion is an engaging portion that engages with the tooth bottom of the drive wheel. A large number of the core metals are arranged in a direction perpendicular to the length direction of the crawler body made of rubber, and at constant intervals approximately equal to the longitudinal width of the strip-shaped flat member, and at each protrusion. is buried in such a way that it protrudes toward the inner circumferential surface of the crawler body, and each protrusion has its upper surface projected in the horizontal direction, so that the length L of the upper surface is approximately 1.2 with respect to the longitudinal width l of the rectangular flat portion. It has a T-shaped shape with dimensions of l~1.8l, and many steel cords are buried in the length direction of the crawler body on both the top and bottom surfaces of the core bar, excluding the areas between the protrusions of the core bar inside the crawler body. It's what I did.

(Function) In a direction perpendicular to the length direction of the crawler body, and at constant intervals approximately equal to the vertical width of the strip-shaped flat member in the longitudinal direction, and in addition, the upper surface length L of the protrusion is Since a T-shaped core metal with dimensions of approximately 1.2l to 1.8l per width l is buried, the depression of the rolling wheels between the tracks is small, reducing running vibration. . Also, inside the crawler body, a large number of steel cords were buried in the lengthwise direction of the crawler body on both the top and bottom surfaces of the core metal, so the core metal was sandwiched between the rigid bodies from above and below.
This greatly suppresses the swinging of the core inside the crawler body, which occurs when the wheels move on the upper surface of the protrusion.

(Example) Hereinafter, an example according to the present invention will be described based on the accompanying drawings.

FIG. 3 is a perspective view of the core metal 10 used in the present invention, and as shown in the figure, a pair of protrusions P, P are formed at the center of the strip-shaped flat member S.
The upper surface of the protrusion P has both edges e and e extending in the horizontal direction to form a T-shape, where L is the length of the upper surface of the protrusion P, and l is the vertical width of the rectangular flat member S. be. Note that F is a groove for preventing wheel slippage sandwiched between the protrusions P and P, and K is an engaging portion that engages with the tooth bottom of the drive wheel.

FIG. 4 is a cross-sectional view of the rubber crawler according to the present invention, and 14 in the figure is the middle brim roller used in this embodiment, which is located between the drive wheel and the idler wheel and supports the machine load. As shown in the figure,
The upper surfaces of the protrusions P and P protruding toward the inner circumferential surface of the crawler body 12 serve as wheel tracks, and directly contact the side body portions 14a and 14b of the middle brim roller 14, and the center body portion 14c. is indented into the groove F to prevent it from coming off. Reference numerals 13 and 13' are steel cords, which are bonded to the top and bottom of the core bar 10 via a thin rubber layer of the rubber crawler body 12, and although not shown, are steel cords that are adjacent to each other in the length direction of the rubber crawler body. Between each engaging part of the core metal,
An engagement hole is drilled into which the tooth tip of the drive wheel fits, and with this structure, the driving force is transmitted from the drive wheel to the engagement part of the core metal, and then to the steel cord. For this reason, the adhesive force between the core metal and the steel cord is designed to be sufficient to handle the driving force, that is, the shear adhesive force in the entire area (bond area) where the core metal and steel cord overlap is safe. In this case, the core metal and the steel cord on its outer circumferential side are designed to be involved in the transmission of the driving force.

FIG. 5 is a longitudinal cross-sectional view of a rubber crawler in which a core bar 10 having a T-shaped protrusion P is buried. , D=d+l), and as shown in the figure, the burial interval d is approximately the same dimension as the longitudinal width l of the strip-shaped flat part, while the T-shaped protrusion P
Since the edges e and e protrude from the front and rear of the upper surface of the protrusions P, the gap t between the adjacent protrusions P is relatively small. In this case, if the gap t is too small, the adjacent protrusions P and P will come into contact with each other at the part where the rubber crawler wraps around the drive wheel and the idler wheel (hereinafter simply referred to as the winding part). The length L of the upper surface of the body P and the vertical width l of the rectangular flat member S
The ratio /l is approximately in the range of 1.2 to 1.8, and the dimension is such that the abutment does not occur.

In the present invention, as described above, the buried interval d of the core bar 10 is set to be approximately the same as the longitudinal width l of the strip-shaped flat member S, and therefore, the steel cord inside the rubber crawler body 12 at the winding part is is wound into a regular polygonal shape, and the rectangular flat member S
Since the bending angle of the steel cord at both ends of the longitudinal width is minimized, and the space between the core metals is not extremely compressed, durability does not deteriorate even after long-term use.

On the other hand, outside the above conditions, the steel cord inside the rubber crawler main body 12 at the winding section will be wound in an asymmetrical shape and a good balance will not be obtained, resulting in a number of problems ( This results in decreased durability, derailment, etc.).

FIG. 6 is an explanatory view of the operation of the rubber crawler shown in FIG.
In contrast to the case where the core bars 10 come off the top surface of the adjacent core metals 10 as shown in the dashed-dotted line as shown in B,
The depression amount Δh of the wheel itself becomes relatively small, and the vertical vibration of the wheel is reduced.

By the way, when the roller moves on the upper surface of the protrusion of the core metal, the part of the core metal embedded in the crawler body swings inside the rubber, and especially under harsh conditions with extremely uneven areas, it moves back and forth. Relatively large oscillations occur in this direction, causing repeated strain on the adhesive interface between the core metal and the rubber material, which accumulates fatigue and causes interfacial delamination, resulting in the core metal peeling off from the rubber crawler and falling off. However, in the rubber crawler of the present invention, the steel cords 13 and 13' are embedded in both the upper and lower surfaces of the buried part of the core metal 10, so the core metal 10 is buried in the upper and lower surfaces. Since the crawler is sandwiched between more rigid bodies, the vibration within the crawler body is suppressed, and as a result, fatigue does not accumulate at the interface between the core metal and the rubber material as described above, and interfacial peeling occurs. Since this prevents this, the durability of the rubber crawler is greatly improved.

(Effects of the invention) The present invention is constructed as described above so that the rubber crawler can be used for construction machinery as well.It supports large loads and does not damage the paved road surface when running on the road. It is something.

In other words, because the upper surface of the protrusion of the core metal is used as a track for the wheels so that the wheels do not come into direct contact with the rubber of the rubber crawler body, there is a phenomenon in which the rubber material is hollowed out and the core metal is exposed and then peels off and falls off. In addition, the spacing between adjacent protrusions on the core metal is narrowed, and the upper surfaces of the protrusions do not abut against each other in the winding section, so vertical vibration of the rolling wheel is reduced. became very rare.

In addition, since the upper surface of the protrusion of the core metal is formed into a T-shape extending horizontally, the weight is light and materials can be saved.

Furthermore, because steel cords are embedded inside the crawler body on both the top and bottom surfaces of the core metal, the core metal is sandwiched between rigid bodies from above and below, suppressing swinging of the core metal even under harsh conditions with extremely uneven areas. As a result, fatigue is less likely to accumulate at the interface between the core metal and the rubber material, and interfacial peeling is prevented, resulting in greatly improved durability of the rubber crawler. Furthermore, as described above, as a result of suppressing the swinging of the core metal, the vertical vibration of the rolling wheels is further reduced.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional rubber crawler (both cross-sectional views in the width direction), Figure 3 is a perspective view of the core metal used in the present invention, and Figure 4 shows the above-mentioned core metal embedded. FIG. 5 is a cross-sectional view of the rubber crawler in the width direction, FIG. 5 is a cross-sectional view of the rubber crawler in the length direction, and FIG. 6 is an explanatory diagram of the action when the crawler is running. 1... Rubber crawler body, 2, 2'... Core metal,
2a... protrusion, 3... steel cord, 4...
Outer wheel, 4'...Middle brim roller, 4'a...Central body part, 4'b...Side body part, 10...Core metal, 12...
Rubber crawler body, 13, 13'...Steel cord, 14...Inner brim roller, 14a, 14b...
Side body part, 14c...Central body part, V...concave groove, S...
...Strip-shaped flat part, P...Protrusion, e...Edge, L
... Length of top surface, l ... Vertical width, F ... Groove for preventing detachment, K ... Engagement part, d ... Core metal burial interval, D ...
Core metal buried pitch.

Claims (1)

[Scope of utility model registration request] Engagement holes into which the tooth tips of the drive wheels fit are formed between each engagement part of the core metal embedded in the crawler body, and in a rubber crawler in which the top surface of each protrusion serves as a rolling wheel track, a strip-shaped flat surface is formed. A pair of protrusions are erected facing each other inside the center of the member, and between each protrusion a large number of core metals are used as engaging parts that engage with the tooth bottoms of the drive wheels.The length of the crawler body made of rubber is The projections are buried in the direction perpendicular to the direction and in the length direction at constant intervals approximately equal to the longitudinal width of the strip-shaped flat member, and each projection protrudes toward the inner circumferential surface of the crawler main body. The upper surface of the protrusion extends in the horizontal direction, and the length L of the upper surface is approximately equal to the longitudinal width l of the rectangular flat section.
It has a T-shape with dimensions of 1.2l to 1.8l, and a large number of steel cords are installed in the length direction of the crawler body on both the top and bottom surfaces of the core metal, excluding between the protrusions of the core metal inside the crawler body. A rubber crawler characterized by being buried.