JPH09301227A - Driving wheel of rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the horizontal slippage of a driving wheel and eliminate the winding of a fibrous material such as grass by radially forming engaging tooth parts from a center part to be connected to the driving shaft of a machine body, and providing a guide part making contact with the lateral side surfaces of a rubber projection between the engaging tooth parts. SOLUTION: Engaging tooth parts 2 are radially provided from a center part 1 to be connected to the driving shaft of a machine body, and a guide part 3 opposed to the lateral side surfaces of a rubber projection is provided between the tooth parts 2, 2. On the other hand, a rubber crawler 10 has steel cords 12 resistant to a tensile force buried in a row in an endless rubber elastic body 11, and rubber projections 13 arranged at a fixed pitch on the inner circumferential surface central part of the elastic body 11. The engaging tooth part 2 is engaged with the rubber projection 13 while its peripheral part makes contact with the inner circumferential surface of the rubber crawler 10 to transmit a driving force. The width of the engaging tooth part is set to be substantially equal to the width where the steel cords 12 are buried, so that a tension added to the rubber crawler can be received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving wheel for driving a rubber crawler.

[0002]

2. Description of the Related Art As a rubber crawler drive system, a system in which a cored bar embedded in a rubber crawler is engaged with a sprocket, and a protrusion is provided on the inner peripheral surface of the rubber crawler, the protrusion and the sprocket are engaged. Although there is a method of driving by combining them, in recent years, there are many cases in which a rubber crawler is used for high-speed traveling, and in this case, the latter method is adopted. However, conventional driving wheels are not completely satisfactory, and further improvements are required.

1 to 3 show a drive wheel that has been conventionally used, and FIG. 1 shows a pair of disks 21 and 22 fixed to a drive shaft which are opposed to each other, and a predetermined number of them are provided between the peripheral edges. It has a structure in which the pin 23 is inserted. Further, FIG. 2 shows an annular flange 24 on the outside of the peripheral edge of the disks 21 and 22 of FIG.
Is formed. Further, FIG. 3 shows a star-shaped drive wheel having a predetermined number of teeth 26 on the circumference of a hub 25 fixed to the drive shaft.

In these drive wheels, pins 23 and teeth 26
By engaging with protrusions protruding at a constant pitch on the inner peripheral surface of the rubber crawler and sequentially kicking them, the driving force can be transmitted to the rubber crawler.

However, each of these drive wheels has merits and demerits. First, in the drive wheel of FIG.
3 had a drawback that grass, straw and other fibrous substances were liable to be entangled, so that the engagement with the rubber crawler was not perfect. In addition, this drive wheel structure has a disadvantage that the tension applied to the rubber crawler cannot be supported. In the drive wheel shown in FIG. 2, the flange 24 comes into contact with the inner peripheral surface of the rubber crawler, so that the tension applied to the rubber crawler can be supported, but the above-mentioned fibrous substance is entangled with the pin 23. The structure is unavoidable. Another problem is that it does not match the purpose of weight reduction. Further, in the drive wheel shown in FIG. 3, the fibrous substance is less likely to be entangled with the teeth 26.
It is not possible to support the tension applied to the drive wheel, and there is no function to prevent lateral displacement between the drive wheel and the rubber crawler.

In a rubber crawler in which a core bar is not embedded, a drive having a portion for supporting a tension having a width substantially equal to a driving width of a steel cord embedded in a longitudinal direction of the rubber crawler Although it is necessary to use wheels, this complicates the structure of the drive wheels and hinders weight reduction.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, fibrous substances such as grass and straw do not become entangled with each other, side slippage of drive wheels is prevented, proper tension can be supported, and further weight reduction is possible. It is an object of the present invention to provide a drive wheel for a rubber crawler.

[0008]

The present invention has been made to solve the above problems, and its gist is to embed a steel cord in an endless rubber elastic body in the longitudinal direction thereof. A drive wheel for driving a rubber crawler, which has rubber protrusions formed at a constant pitch in the center of the inner peripheral surface and a rubber lug on the outer peripheral surface, and is connected to the drive shaft of the machine body. A central portion, an engaging tooth portion that is formed radially from the central portion and that engages with the chlora longitudinal direction surface of the rubber projection, and a contact portion of at least the inner peripheral surface of the rubber crawler of the engaging tooth portion. The width is approximately equal to the driving width of the steel cord, and the rubber projections are provided between the engaging tooth portions, and the guide portions are provided to prevent lateral displacement of the drive wheels by abutting on the left and right side surfaces of the rubber projections. The present invention relates to a driving wheel of a rubber crawler characterized by the above.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The drive wheel for rubber crawlers of the present invention has the above-mentioned structure, and the width of the engaging tooth portion is a steel coil
It has a guide portion for supporting the tension of the rubber crawler and having a width substantially the same as the driving width of the blade and for sandwiching the rubber projections preferably from the left and right in order to prevent lateral displacement. By configuring the drive wheel in this way, there is no pin portion of the conventional drive wheel, there is no entanglement of fibrous substances, and the guide portion is formed across the rubber protrusion protruding from the inner peripheral surface of the rubber crawler. Since it is also provided with a lateral slip prevention function, the structure is relatively simple and leads to weight reduction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drive wheels of the present invention will be described below in more detail with reference to the drawings. 4 is a side view of the drive wheel of the present invention, FIG. 5 is a sectional view taken along line AA of FIG. 4, and FIG. 6 is a sectional view taken along line BB of FIG. In the figure, reference numeral 1 is a central portion connected to the drive shaft of the machine body, and an engaging tooth portion 2 is provided from the central portion 1 in the radial direction. A guide portion 3 facing the side surface is provided. On the other hand, 10 is a rubber crawler, which is a steel roller that resists tensile tension in an endless rubber elastic body 11 that constitutes the rubber crawler.
The cords 12 are embedded in a line, and rubber protrusions 13 are provided at the center of the inner peripheral surface of the rubber elastic body 11 at a constant pitch. Then, the peripheral pitch of the engaging tooth portion 2 is made to coincide with the pitch of the rubber protrusion 13.

As shown in FIG. 6, the engaging tooth portion 2 engages with the rubber projection 13 while contacting the peripheral edge of the engaging tooth portion 2 with the inner peripheral surface of the rubber crawler 10 to transmit the driving force. The width of the peripheral edge of the tooth portion 2 is substantially the same as the width W in which the steel code 12 is embedded, and thus the tension applied to the rubber crawler 10 can be received.

As shown in FIG. 5, at least the left and right side surfaces 13 ₁ of the rubber protrusion 13 are provided between the engaging tooth portions 2 and 2.
A guide portion 3 having a U-shaped cross section that contacts 13 ₂ is provided over the entire circumference of the drive wheel. In this example, the guide portion 3 is in contact with the top portion 13 ₃ of the rubber protrusion 13. There is. Although the tip of the guide portion 3 does not contact the inner peripheral surface of the rubber crawler 10, it may extend to such an extent that the tip thereof contacts the inner peripheral surface.

As described above, in the drive wheel of the present invention, the engaging tooth portion 2 engages with the rubber protrusion 13 and is substantially the same as the embedding width W of the steel code 12 embedded in the rubber. The rubber crawler 10 comes into contact with the inner peripheral surface of the rubber crawler 10 with the same width, so that the tension applied to the rubber crawler 10 is completely supported by the engaging tooth portion 2.
Since the guide portion 3 is brought into contact with at least the left and right side surfaces 13 ₁ and 13 ₂ of the rubber protrusion 13, for example, the rubber claw is
Even if a lateral deviation occurs between the drive wheel and the wheel 10, the rubber protrusion 13 does not come off from the guide portion 3, and the occurrence of wheel loss is significantly reduced.

FIG. 7 is a sectional view similar to FIG. 5 showing the deformation of the drive wheel of the present invention. In this example, the guide portion 3 does not directly contact the side surfaces 13 ₁ and 13 ₂ of the rubber projection 13 and the rubber projection is formed. 1
The intersection 13 ₀ of the side surfaces 13 ₁ , 13 ₂ of ₃ and the top 13 ₃
The structure is such that it makes contact with, and this contact prevents the lateral displacement.

The engaging tooth portion 2 of the drive wheel of the present invention has a tip 2
_It is preferable that it becomes thinner as it becomes _0. Therefore, even if a fibrous substance such as grass or straw is wrapped around, it is preferable to have a structure in which this falls off naturally.

[0016]

Since the drive wheel of the present invention has the above-described structure, it satisfies the function of supporting the tension of the rubber crawler and the function of preventing lateral slippage, and is suitable for high speed running of the rubber crawler. Can withstand, and its practical value is extremely high. The material forming the drive wheel of the present invention is not particularly limited, but the central portion 1, the engaging tooth portion 2, and the guide portion 3 forming the drive wheel can be manufactured by injection molding of synthetic resin. In addition, it is possible to reduce the weight, simplify the manufacturing, etc., and reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional drive wheel for a rubber crawler.

FIG. 2 is a perspective view showing another example of a conventional drive wheel for a rubber crawler.

FIG. 3 is a perspective view showing yet another example of a conventional drive wheel for rubber crawlers.

FIG. 4 is a side view of a drive wheel for a rubber crawler of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a sectional view similar to FIG. 5, showing a modification of the drive wheel of the present invention.

[Explanation of symbols]

1 ... Central part connected to drive shaft of machine body, 2 ... Engaging tooth part provided radially from the central part, 3 ... Rubber projection guide part provided between engaging tooth parts, 10 ...・ ・ ・ Rubber crawlers, 11 ・ ・ ・ Endless rubber elastic bodies constituting the rubber crawlers, 12 ・ ・ ・ Steel seals embedded in the endless rubber elastic bodies
, 13 ... rubber projections provided on the inner peripheral surface of the rubber elastic body, 13 ₁ , 13 ₂ ... left and right side surfaces of the rubber projections, 13 ₃ ... top of the rubber projections, 13 ₀ ... side surfaces of the rubber projections Intersection with the top, W ... The embedding width of the steel cord embedded in the rubber elastic body.

Claims (1)

[Claims] 1. A steel cord is embedded in an endless rubber elastic body in the longitudinal direction thereof, a rubber protrusion is formed at a constant pitch in the center of the inner peripheral surface, and a rubber lug is formed on the outer peripheral surface. Drive wheels for driving the rubber crawlers, which are connected to the drive shaft of the machine body, and which are formed radially from the center and engage with the crawler longitudinal surface of the rubber protrusions. The contact portion between the engaging tooth portion and at least the inner peripheral surface of the rubber crawler of the engaging tooth portion has a width substantially equal to the driving width of the steel code, and the rubber protrusion is contacted between the engaging tooth portions. A rubber crawler drive wheel, which is provided with a guide portion that comes into contact with the drive wheel to prevent lateral displacement of the drive wheel.