JP2001146182A - Crawler travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler travel device that can prevent derailment of its track rollers and a turnup of its crawler belt as well via a simple structure. SOLUTION: At least one of track rollers 2 to 4 of the crawler travel device is a triple roller comprising, in integral relation, outer roller portions 9 rollable outside a right and a left anti-runout rib 8 formed on the internal surface of a crawler belt 7, and a middle roller portion 10 rollable inside the right and left anti-runout ribs 8. The outer roller portions 9 have a smaller outside diameter than the middle roller portion 10. In the front view, the contact surface of each outer roller portion 9 with the crawler belt 7 is inclined at a given angle θ outwardly upward to the right or left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler running device capable of preventing a crawler belt from coming off and being turned up.

[0002]

2. Description of the Related Art Conventionally, in a crawler traveling device constructed by winding a crawler belt around a tension wheel, a driving sprocket and a plurality of ground wheels, as shown in FIG. 4 (a), and a middle rolling wheel 12 which rolls inside the left and right retaining projections 8, 8 as shown in FIG. 4 (a). Is composed. FIG.
As shown in (a), there is also a type in which a triple wheel 13 in which a middle wheel and an outer wheel are integrally formed constitutes a ground wheel.

[0003]

In a traveling vehicle having a crawler traveling device, when the traveling vehicle rotates in place, the rotation of one of the left and right crawler traveling devices is generally stopped, and the other crawler traveling device is stopped. A method has been used in which only the traveling device is rotated to perform rotation around the stopped crawler traveling device. However, in this method, since a large frictional force is generated between the crawler traveling device on the stop side and the traveling road surface, when the rotation is performed in the direction A, the space between the crawler belt and the contact wheel is shown in FIG. As described above, the external forces M and N act in the direction of the arrow. At this time, if the grounding wheel is constituted by the outer wheel 11 as shown in FIG.
As shown in FIG. 3 (b), one side of the abduction wheel 11 floats off the crawler belt 7, causing the wheel to slip off. or,
4A, the two ends of the crawler belt 7 are easily turned up in a portion where the core metal does not pass as shown in FIG. 4B. This caused the crawler belt 7 to be damaged. Further, even if the grounding wheel is constituted by a triple wheel 13 as shown in FIG. 5A, the triple wheel 1 as shown in FIG.
The intermediate wheel portion 3 floated from the crawler belt 7, and it was not possible to prevent the wheel from falling off.

[0004]

A crawler belt 7 is wound around a plurality of ground wheels 2, 3, and 4 provided below the track frame 1, and tension wheels 5 and a driving sprocket 6 provided before and after the ground wheels. In the crawler traveling device, left and right retaining projections 8, 8 are arranged on the inner peripheral surface of the crawler belt 7 at predetermined intervals in a circumferential direction, and at least one of the ground contact rollers 2, 3, 4 is provided. A triple roller comprising outer wheel portions 9 and 9 which roll outside the left and right stopper protrusions 8 and a middle wheel portion 10 which rolls between the left and right stopper protrusions 8; The intermediate wheel portion 10 has a larger diameter than the outer wheel portions 9, 9, and the contact surfaces of the outer wheel portions 9, 9 with the crawler belt 7 are viewed from the front. Characterized in that it is formed on a slope inclined at a predetermined angle θ toward the left and right outward and upward. It has a structure of La traveling device.

[0005]

In the traveling vehicle having the crawler traveling device of the present invention, when the vehicle makes a turn in the direction A, as shown in FIG. External forces M and N act. At this time, the crawler belt 7 tends to be turned up at a portion where the core metal 18 does not pass, but the crawler belt 7 is securely pressed down by the outer roller portions 9, 9 constituting a triple roller. The turning up is prevented.
Also, the outer diameter of the outer rolling portions 9 of the triple rolling wheel is
And the contact surface with the crawler belt 7 is formed on the inclined surface at a predetermined angle θ toward the left and right outwardly upward when viewed from the front. 7 is located above the tilt fulcrum Q of the crawler belt 7 with respect to the conventional triple wheel 13 shown in FIG. As a result, as compared with the conventional triple roller 13, the separation start angle between the intermediate roller portion 10 and the crawler belt 7 due to the inclination of the crawler belt 7 is increased, and the non-removable inclination range of the crawler belt 7 with respect to the triple roller is increased. It will be.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. The crawler traveling device according to the present invention includes a driving sprocket 6 which rotates by receiving a driving force from a prime mover in a rear upper direction.
A crawler belt 7 is wound around a tension wheel 5 that can be adjusted in the front-rear direction above and forward and a plurality of ground wheels 2, 3, and 4 located on the ground side to form a ship bottom type in a side view. By projecting the front upper tension wheel 5 forward from the ground contact portion, an inclined surface is formed on the front surface of the traveling device to improve running performance.

Reference numeral 1 denotes a track frame extending in the front-rear direction, which supports a plurality of ground contact wheels 2, 3, and 4 below, and has a guide tube 14 formed by a square pipe mounted on an upper surface thereof. An adjusting rod 15 is fitted into the guide cylinder 14 so that the adjusting rod 15 can slide in the front-rear direction with respect to the track frame 1. A tension arm 16 for supporting the tension wheel 5 is attached to the front end of the adjusting rod 15.

Reference numeral 17 denotes an idler bolt for adjusting the position of the adjusting rod 15 in the front-rear direction. When the crawler belt 7 is loosened due to elongation or the like, the idler bolt 17 is operated to move the adjusting rod 15 forward. The tension roller 5 at the front end of the adjusting rod 15 is pushed out to adjust the tension of the crawler belt 7. Crawler belt 7
Has a bifurcated branched left and right retaining projections 8, 8 arranged at predetermined intervals in the longitudinal direction at the center of the inner peripheral surface thereof. The core metal 18 is inserted into the inside 7.

The grounding wheels 2, 3, and 4 are formed only of the wheel 3 positioned on the center O of rotation of the crawler belt 7 by middle wheels which are sandwiched between the left and right retaining projections 8, 8.
Connect the other grounding wheels 2, 4 to the left and right
The outer rolling portions 9 and 9 that roll outside the outer wheel 8 and the middle rolling portion 10 that rolls between the left and right retaining projections 8 and 8 form a triple rolling wheel. The outer diameters of the outer wheel portions 9, 9 of the triple wheel wheels 2, 4 are made smaller than those of the intermediate wheel portion 10, and the front surfaces of the contact surfaces between the outer wheel portions 9, 9 and the crawler belt 7 It is formed on an inclined surface having a predetermined angle θ toward the left and right outward and upward. The above-mentioned middle rolling wheel 3 constitutes a movable rolling wheel which can swing freely together with a triple rolling wheel 4 arranged at one rear thereof, and the movable rolling wheels 3 and 4 are movable around a support shaft 19. It is installed at the front and rear ends of the frame 20.

When the in-situ turning is performed by using the crawler traveling device having the above-described configuration, the crawler traveling device is connected to the grounding wheels
Since the roller 4 is formed by triple rollers, even if the crawler belt 7 is going to be turned up, the crawler belt 7 is surely held down by the outer rollers 9 and 9 constituting the triple rollers 2 and 4 to prevent it from being turned up. Can be.

The outer races 9, 9 of the triple rollers 2, 4 have an outer diameter smaller than that of the middle race 10, and the contact between the outer races 9, 9 and the crawler belt 7 is further reduced. 2B, the crawler belt 7 is inclined with respect to the triple rollers 2 and 4 because a slanted surface having a predetermined angle θ is formed in the right and left directions outward and upward when viewed from the front. As shown in the figure, the intermediate wheel portion 10 sandwiched between the left and right retaining projections 8, 8 is hardly lifted from the crawler belt 7, and the wheel-preventing property can be improved. Further, since the center rolling wheel 3 arranged on the turning center O at the time of turning on the spot is not affected by the external forces M and N at the time of turning on the spot, as shown in FIG. Thus, the crawler belt 7 can be restricted from being laterally displaced between the crawler belts 8 and 8.

In the embodiment of the present invention, the crawler traveling device has the middle rolling wheel 3 as a movable rolling wheel together with the triple rolling wheel 4 arranged one behind the middle rolling wheel. Any configuration may be used without limitation. For example, the middle rolling wheel 3 may be configured as a movable rolling wheel together with a triple rolling wheel disposed in front thereof, or the middle rolling wheel 3 may be a movable rolling wheel. Instead, a normal grounding wheel may be used. In addition, in the claims, numbers are written for the purpose of convenience with the drawings, but this entry is not intended to limit the structure of the attached drawings of the present invention.

[Brief description of the drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2A is a front view of the grounding wheels 2 and 4 according to the embodiment of the present invention. (B) A front view showing a state in which the crawler belt 7 is inclined downward to the right with respect to the ground wheels 2 and 4.

FIG. 3A is a front view of an abduction wheel. (B) A front view showing a state where the crawler belt 7 is inclined downward to the right with respect to the abduction wheel.

FIG. 4A is a front view of a middle wheel. (B) Front view of the center rolling wheel showing a state where the crawler belt 7 is turned up.

FIG. 5 (a) is a front view of a conventional triple wheel 13; (B) A front view showing a state where the crawler belt 7 is inclined downward to the right with respect to the conventional triple roller 13.

FIG. 6 is a plan view of the ground wheels 2, 3, and 4 in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Track frame 2 Grounding wheel 3 Grounding wheel 4 Grounding wheel 5 Tension wheel 6 Drive sprocket 7 Crawler belt 8 Detachment prevention protrusion 9 Roller wheel portion 10 Middle wheel portion θ Inclination angle

Claims (1)

[Claims] 1. A plurality of ground wheels (2), (3) and (4) arranged below a track frame (1), and tension wheels (5) and a drive sprocket (6) arranged before and after the ground wheels.
A crawler belt (7) wound around the crawler belt (7), left and right retaining projections (8), (8) are arranged on the inner peripheral surface of the crawler belt (7) at predetermined intervals in the circumferential direction. And the ground wheels (2), (3),
(4) at least one of the outer wheel portions (9) that rolls outside the left and right retaining projections (8) and (8);
(9) and a middle wheel portion (10) that rolls between the left and right retaining projections (8) and (8), and a diameter of the middle wheel portion (10). Abduction wheel part (9), (9)
And a contact surface of the outer wheel portions (9), (9) with the crawler belt (7) is inclined a predetermined angle (θ) upward and leftward and rightward in a front view. A crawler traveling device formed in a crawler.