JPH072182U - Rubber crawler core and crawler device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In a mobile construction machine that uses a rubber crawler, the wheels are abutted on the running surface of a cored bar that is embedded in the rubber crawler body at regular intervals. Try to reduce the occurrence of vibration. In a core metal 10 having a pair of corners 12 projecting on both sides of a central engaging portion 14 between the left and right wing parts 11, both outer sides of each of the corners and the vicinity of the root of the core metal wing part A shoulder 13 which is one step higher is formed, and the shoulder is formed in a projecting portion projecting forward and backward in the width direction of the cored bar wing, and the inside which is not projecting has a shape matching the cored bar wing, and the shoulder It is characterized in that the step upper surface is formed as an upward slope from the inside of the cored bar blade toward the front and rear overhangs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a core bar and a crawler device for a rubber crawler for a mobile construction machine, and more particularly, to an inner ring and an outer brim of a roller wheel, respectively, on an upper surface of a corner portion of a core metal and an upper surface of a shoulder provided outside the corner portion, respectively. The present invention relates to a rubber crawler used as the orbit of.

[0002]

[Prior art]

 In recent years, rubber crawlers have been frequently used in mobile construction machines. FIG. 7 shows an example of a conventional rubber crawler, in which A is a cross-sectional view in the width direction showing the relationship between the outer collar type roller wheel 101 and the rubber crawler 102, and 101a and 101b in the figure. Inner and outer collars of the outer brim type rolling wheel 101, 103 is a core bar, 103a, 103b and 103c are shoulders, corners and wings of the core bar 103, m'is an upper surface of the shoulder bar 103a, Reference numeral 104 is a steel cord, and 105 is a lug. The outer collar 101b rolls on the shoulder upper surface m '.

[0003]

[Problems to be solved by the device]

 FIG. 6B is a sectional view of the rubber crawler 102 in the circumferential direction, in which t'is a protruding portion of the shoulder 103a, U'is a metal core interval, V is a distance between the steel cord 104 and the shoulder 103a, Reference numeral 106 is a groove provided between the cores. As shown in the figure, in this example, the overhanging portion t ′ is overhanged between the cored bars so that the interval U ′ between the cored bars is relatively small, and the interval V is relatively small. In the winding portion around the idler wheel, the compression ratio of the core metal interval compressed on the inner peripheral side of the steel cord is relatively small, and the core metal interval U'can be set small, so that the rolling wheel vibration is reduced. Although the number is relatively small and the ride comfort is good, as shown in FIG. 6C, when the rolling wheels are located between the cored bars, the overhanging portions t ′ and t ′ are depressed due to the rolling wheel load. In addition, it causes vibration. The present invention intends to further reduce such a fall of the wheel to reduce vibration as much as possible.

[0004]

[Means for Solving the Problems]

 According to the present invention, in a cored bar having a pair of corners projecting on both sides of the central engaging portion between the left and right wings, a shoulder step higher than both outer sides of each corner and the vicinity of the root of the cored bar is provided. The shoulder step is formed so as to project to the front and rear in the width direction of the cored bar wing, and the inside that does not project is shaped to match the cored bar wing, and the top surface of the shoulder is A rubber crawler core bar formed on the upward slope from the inside of the wing toward the front and rear overhangs, and the rubber crawler core bar inside the rubber crawler body and the corners of the core bar inside the rubber crawler. The upper surface of the shoulder protruding portion is embedded so that the upper surface of the shoulder protruding portion is exposed to the inner peripheral surface, and the top surface of the corner portion of the core metal and the upper surface of the shoulder protruding portion are the inner ring of the outer collar type rolling wheel and It is characterized in that the outer brim is a wheel raceway with which each abuts. In this case, the cored bar may have a structure in which the shoulder has an overhanging portion only on one side in the width direction of the blade portion and is formed in opposite directions at the left and right positions.

[0005]

[Action]

 In the present invention, the inner ring and the outer collar of the outer brim type rolling wheel are respectively brought into contact with the top surface of the corner portion of the core metal and the upper surface of the shoulder step overhang portion. It becomes an action. (A) When the rolling wheel is located on the overhanging part, the outer collar comes into contact with the upper surface of the overhanging part, and the load of the rolling wheel is applied to the overhanging part. It becomes almost parallel to the inner peripheral surface, and when the rolling wheel moves toward the center of the core metal and is located on the corner, the inner ring rides on the corner top surface and the corner supports the rolling wheel load. As a result, the rolling wheels travel at the same height in the entire area between the overhangs before and after the corner. (B) When the rolling wheels are located on the overhanging portions, the overhanging portions come close to each other and the interval between the cores is narrowed, so that the rolling wheel raceways are substantially continuous. Due to the effects of (a) and (b), the rolling wheels do not fall, and the vibration can be reduced as much as possible.

[0006]

EXAMPLE FIG. 1 shows a first example of a core bar for a rubber crawler according to the present invention, in which 10 is a core bar, and 11, 12 and 13 are wings, corners and shoulders, respectively. Steps, 12a are top surfaces of the corners 14, 13a is an overhanging portion of the shoulder step 13, m is an upper surface of the shoulder step 13, 14 is an engaging portion with the driving wheel, and as shown in the figure, the left and right tops are provided. The surfaces 12a, 12a are flat surfaces, and the left and right shoulders 13, 13 are raised one step higher than the vicinity of the root of the cored bar wing so as to project to the front and back in the width direction of the cored bar wing, respectively. The inside between the projecting portions 13a and 13a 'is in a state of matching the core metal blade portion.

FIG. 2 is a perspective view of a rubber crawler 20 in which a cored bar of this embodiment is embedded. In FIG. 2, 21 is a crawler body, F is an inner peripheral surface of the crawler body 21, 3 is a steel cord, and 4 is The lugs 5 are engagement holes into which the teeth of the drive wheels are fitted, and the lugs 5 are arranged on the inner peripheral surface F so that the distance between the protruding portions 13a and 13a 'arranged in the same row is lowered as shown in the figure. There is.

FIG. 3 is a sectional view in the circumferential direction of the rubber crawler of FIG. 2, and illustrates the action when the rolling wheel rolls on the top surface 12a of the corner portion 12 and the upper surface m of the overhanging portion 13a. It is a thing. In this embodiment, as will be described below, the inner ring 101a and the outer flange 101b of the roller 101 contact the top surface 12a of the corner portion 12 and the top surface m of the overhanging portion 13a, respectively. The step h between the surface 12a and the upper surface m and the step h ′ between the inner ring 101a and the outer collar 101b have the same dimensions.

As shown in FIG. 1 (a), when the rolling wheel is located on the overhanging portion 13a, the outer collar 101b rides on the upper surface m and the overhanging portion 13a supports the rolling wheel load. At this time, bending occurs around the embedded portion of the cored bar 10 inside the crawler body 21, the center line of the cored bar inclines to O ', and the overhanging part 13a sinks and the upper surface m becomes the inner peripheral surface F. In this case, it is assumed that the overhanging portion 13a sinks and at the same time approaches the adjacent overhanging portion 13a to shorten the interval between the metal cores so that the rolling wheel track is almost continuous. As shown in (1), when the rolling wheel advances toward the center of the core metal and is positioned on the corner portion 12, the inner ring 101a rides on the top surface 12a and the corner portion 12 supports the rolling wheel load.

As a result, the rolling wheels progress at the same height in the entire area between the overhanging portions 13a, 13a in front of and behind the corner portion 12, and when the rolling wheels are located on the overhanging portion, the overhanging is achieved. Since the members come close to each other and the interval between the cores is narrowed, the rolling wheel raceways become almost continuous and the rolling wheels do not fall.

FIG. 4 shows a second embodiment of a metal core for a rubber crawler according to the present invention. As shown in FIG. 4, in this embodiment, the overhanging portions 13a and 13a ′ are in opposite lateral directions. It is provided only on the ridges and is designed to coincide with the wing portion except for the root portions of the overhang portions 13a and 13a '. FIG. 5 is a perspective view of the rubber crawler in which the cored bar of this embodiment is embedded, and the distance between the overhanging portions 13a, 13a arranged in the same row on the inner peripheral surface F is further lowered.

FIG. 6 is a circumferential cross-sectional view of the rubber crawler of FIG. 5, and illustrates the action of the rolling wheel rolling on the top surface 12a of the corner 12 and the top surface m of the overhanging portion 13a. In this embodiment as well, the inner ring 101a and the outer flange 101b of the roller contact the top surface 12a of the corner portion 12 and the upper surface m of the overhanging portion 13a, respectively. The step h and the step h'between the inner ring 101a and the outer collar 101b are equal in size, and as shown in FIG. 9 (a), when the rolling wheel is located on the overhanging portion 13a, the outer collar 101b has an upper surface m. Since the upper surface m rides on the vehicle and the rolling wheel load is supported, the overhanging portion 13a sinks. As shown in FIG. 6B, when the rolling wheel is located on the corner 12, the inner ring 101a is the top surface. The corner portion 12 rides on the wheel 12a and bears the load of the rolling wheels.

[0013]

[Effect of device]

 According to the present invention, the shoulders provided on the outer surfaces of the pair of corners facing each other near the center of the core bar are provided with overhanging portions that extend in the front-back direction of the blade width from the corner outer side and the vicinity of the root of the core bar blade. The front and rear overhangs have a shape that matches the core metal wing, and the upper surface of the overhang is formed as an upward slope from the side between the overhangs to the end on the overhang side. Since the upper surface of the shoulder is buried so as to be exposed on the inner peripheral surface of the rubber crawler body, when the rolling wheel rides on the overhanging portion, the overhanging portion is appropriately depressed and the rolling is performed. Since the height of the ring raceway is maintained, the rolling wheels do not fall between the cores. Also, when the rolling wheel rides on the overhanging portion, the overhanging portion sinks and at the same time approaches the opposing overhanging portion, the interval between the cored bars is shortened and the rolling wheel track becomes continuous, reducing vibration. It is a great contribution.

Since the present invention uses an outer collar roller, it can be easily used for both iron crawlers and rubber crawlers, and the outer collar roller has an excellent effect of preventing the crawler from coming off. Since the rubber crawler comes into contact with the corners or shoulders of the rubber crawler, it has an effect of not damaging the inner peripheral surface of the rubber crawler. According to the present invention, since the outer collar of the rolling wheel presses only the shoulder step overhanging portion of the core metal, the width of the outer collar and the overhanging portion can be reduced. This reduces the cost and weight of the wheels and core. In addition to the above, according to the second embodiment of the present invention, since the overhanging portion is provided only on one side surface in the width direction of the blade portion, the size of the overhanging portion can be increased. Therefore, the vibration prevention effect is further enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a metal core for a rubber crawler according to the present invention.

FIG. 2 is a perspective view of a rubber crawler in which a cored bar of the first embodiment is embedded.

FIG. 3 is a sectional view in the circumferential direction of the rubber crawler shown in FIG. 2 for explaining the action of the rolling wheels.

FIG. 4 is a perspective view of a second embodiment of a mandrel for rubber crawlers.

FIG. 5 is a perspective view of a rubber crawler in which a cored bar of a second embodiment is embedded.

6 is a circumferential cross-sectional view of the rubber crawler shown in FIG. 5 for explaining the action of the rolling wheels.

FIG. 7 shows a conventional example.

[Explanation of symbols]

 3 Steel Cord 4 Lug 10 Core Bar 11 Wing Part 12 Corner Part 13 Shoulder Step 14 Engagement Part 20 Rubber Crawler 21 Crawler Body

Claims (3)

[Scope of utility model registration request] 1. A core metal having a pair of corners projecting on both sides of a central engaging portion between the left and right wings, and shoulders which are one step higher than both outer sides of each corner and the vicinity of the root of the core wings. Is formed, and the shoulder is formed in an overhanging portion projecting forward and backward in the width direction of the cored bar wing, and the inside that does not project is shaped to match the cored bar wing, and the upper surface of the shoulder is A metal core for a rubber crawler, which is formed on an ascending slope from the inside of the wing toward the front and rear overhangs. 2. The mandrel for a rubber crawler according to claim 1, wherein the shoulders on both outer sides of the corners form an overhanging portion only in one of the blade width directions, and each overhanging portion of the shoulders. A core bar for a rubber crawler, which is formed in opposite directions at both lateral left and right positions of a corner portion. 3. The rubber crawler core according to claim 1 or 2 is provided in a rubber crawler body, corner portions of the core bar project to an inner peripheral surface of the rubber crawler, and shoulder upper surfaces are provided in the rubber crawler body. A crawler device, which is embedded so as to be exposed on a peripheral surface, and wherein a top surface of a corner portion and an upper surface of a shoulder of the core metal serve as a roller raceway with which an inner ring and an outer collar of an outer collar type rolling wheel abut, respectively.