JP2000272557A - Sprocket for crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent falling out of a crawler so that clogged sediment of mud, foreign matter, etc., can be easily removed, by removably mounting a side ring regulating right/left cross movement of a guide protrusion in an outer side end surface of a lateral shaft direction protruded part engaging a crawler internal peripheral guide protrusion provided in a rotational peripheral part. SOLUTION: A drive sprocket 14 is constituted of a center disk 1 in a central part and a side ring 6 mounted in right/left both sides of the center disk 1 to be a circular plate member. The center disk 1 is integrally formed with columnar protrusion parts 4 protruded in a width wider than a disk width in the external periphery of a disk of suitable thickness. The side ring 6 is removally mounted over right/left outer side end faces of the protrusion part 4 by bolt tightening or the like. Here, the protrusion part 4 is formed of a bolt hole 31 for set bolt insertion in both ends, and the side ring 6 is formed of holes 32 for bolt insertion in an overlapped part with the bolt hole 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction of a drive sprocket of a crawler used for agricultural or transport construction vehicles such as agricultural tractors and combiners.

[0002]

Conventionally, Japanese Patent Application Laid-Open No. 6-14 / 1994
As shown in Japanese Patent No. 4306, in order to prevent the crawler from slipping off, side rings are integrally formed on the left and right outer surfaces of the single-projection drive type sprocket by welding or the like, and a gap for mud discharge is provided inside the side ring. Are known. However,
Mud and foreign matter accumulated inside these side rings are
When the vehicle is stopped or the vehicle is stored for a long period of time and the moisture dries, the gap is easily clogged, and there is a problem that it is troublesome to remove deposits on the sprocket portion.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a crawler sprocket as follows. That is, the crawler 2
Protrusions 4 in the horizontal direction for engaging the guide protrusions 3 on the inner periphery are provided, and side rings 6 for restricting the lateral movement of the guide protrusions 3 are attached to and detached from the outer end surfaces of these protrusions 4. A crawler sprocket that can be freely mounted.

[0004] The side ring 6 is a sprocket of a crawler characterized in that it is equally divided into a fan shape.

[0005]

While the vehicle is running, the sprocket 14
Are engaged with the guide projections 3 of the crawler 2 to drive or guide the crawler 2. At this time,
Since a side ring 6 is provided at an outer end of the protrusion 4, and the guide protrusions 3 of the crawler 2 are located between the side rings 6, even if a lateral load is applied to the crawler 2 such as during turning, the guide is provided. The left and right movements of the protrusions 3 are restricted, and the crawler 2 is prevented from falling off. In addition, since the projection 4 is formed in a cylindrical shape, it is possible to prevent the mud from being clogged between the inner and outer side rings 6.

When the vehicle is inspected and maintained, by removing the side ring 6, an engagement portion with the sprocket appears, and deposits such as mud and foreign matter clogging the sprocket can be easily removed. Further, when the side ring 6 is equally divided into a fan shape, particularly when the side ring 6 on the inner side of the vehicle is removed, each part is located at a position where a tool can easily enter or at a position separated from the engaging portion of the crawler, that is, Can be removed while being moved out of the way, so that the attachment / detachment operation is facilitated and the number of parts at the time of production or the like can be reduced as compared with a configuration in which the device is divided into half moons.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A so-called semi-crawler type tractor in which a crawler 2 is mounted on a rear axle 8 of a tractor 7 will be described below as an embodiment of the present invention. The tractor 7 has an engine mounted below the hood 10 on the upper side of the front wheels 9, and has a clutch housing 11 and a transmission case 1.
The drive sprocket 14 is mounted on the rear axle 8 of the rear axle housing 13 that protrudes on both left and right sides of the transmission case 12.

Reference numeral 15 in FIG. 2 denotes a steering handle,
16 is a fender, 17 is a cockpit, 18 is a gate-shaped safety frame extending between the left and right fenders 16, 19 is a three-point link mechanism such as a top link 20, a lower link 21, and a lift link 22 at the rear of the vehicle body 7. It is a rotary tilling device that is connected to be able to move up and down. 23 is a tillage claw, 24 is a tillage cover, and 25 is a mast.

Then, the input shaft of the tilling device 19 is interlocked with the power take-out shaft 26 at the rear end of the transmission case 12 via an interlocking shaft via a universal joint or the like, and the tilling claw 23 shaft can be transmitted to perform tilling. . The left and right crawlers 2 are wound around a drive sprocket 14 attached to the rear axle 8, a lower lower rolling wheel 27, a front rolling wheel 28 and a rear rolling wheel 29, and It is driven by rotation. Further, inside the crawler 2, a reinforcing wire and the like are mainly contained inside the rubber material.
The guide projections 3 are disposed on the inner peripheral surface of the crawler 2 in two right and left directions. Alternatively, a part of the rubber material may be formed so as to protrude or may be protruded from a part of the embedded core.

The drive sprocket 14 around which the crawler 2 is wound, the wheels 27, 28, 29, etc. are provided on the crawler frame 30 and are detachably attached to the left and right sides of the transmission case 12. The drive sprocket 14 includes the center disk 1 at the center and side rings 6 which are circular plate members attached to the left and right sides. The center disk 1 is formed integrally with a columnar projection 4 projecting wider than the disk width on the outer periphery of a disk having an appropriate thickness, and side rings 6 are formed on left and right outer end surfaces of the driving projections 4. Removably attach with bolts etc.

A bolt hole 31 for inserting a set bolt is formed at each end of each of the drive projections 4..., And a hole 32 for inserting a bolt is formed in a portion where the bolt hole 31 overlaps with the side ring 6. ing. In the drive sprocket 14 thus configured, a gap 33 for removing mud is formed at an appropriate interval between the left and right side surfaces of the center disk 1, the protrusions 4 and the side ring 6.

The crawler 2 wound around the drive sprocket 14 has a guide projection 3 engaged with each drive projection 4. The crawler inner surface 5 outside the guide projection 3 is an outer peripheral surface of the side ring 6. Supported by When the drive sprocket 14 is mounted on the rear axle 8 and rotated, each of the rolling wheels 27 and 2 is rotated.
The crawler 2 is rotated while being guided by 8, 29. When muddy soil, straw waste and the like are entrained by the rotation of the crawler 2, they tend to adhere and accumulate on the outer periphery of the drive sprocket 14. At this time, the mud or the like pressed by the rotation of the crawler 2 is extruded from the outer peripheral portion of the wide mud hole 33 toward the center of rotation. The mud or the like extruded in this manner falls down and is discharged outside the crawler 2 width.

The side disk 6 may be integrally mounted on the center disk 1 and then mounted on the rear axle 8 as a drive sprocket 14, but after the center disk 1 is mounted on the rear axle 8 and the crawler 2 is wound around the side disk 6, May be installed. In FIG. 4, the point different from the above example is that the side ring 6 is equally divided into a fan shape and each ring part 6A, 6B,
6C and 6D can be attached and detached with bolts.

At the time of inspection and maintenance of the driving sprocket configured as described above, the engagement portion with the sprocket appears by detaching the side ring 6 to easily remove deposits such as mud and foreign matters clogged here. can do. Further, since the projections 4 are formed in a columnar shape and provided on the center disk 1 with the gap 33, the mud is hardly clogged and inspection and maintenance are easy.

Further, when the side ring 6 is equally divided into a fan shape, particularly when the side ring 6 inside the vehicle is removed, each part is located at a position where a tool can easily enter or a position separated from an engaging portion of the crawler, that is, Since the sediment can be removed while being moved to a position where it does not interfere, the attaching / detaching operation is further facilitated, and the number of parts during production and the like can be reduced as compared with a configuration in which the sediment is divided into half moons.

Hereinafter, the configuration of the tractor 7 will be described in detail. The point shown in FIGS. 5 and 6 is that the pair of left and right crawler frames 30 mounted on the rear axle 8 are steered and rotated in conjunction with the front wheels 9 operated by steering of the steering handle 15. In addition, the lateral deflection of the working device such as the tilling device 19 at the rear of the vehicle body 7 is reduced. In the case of inclining along the ridge line of the slope, the work in the posture in which the rear part of the tractor body 7 slides toward the valley side and is inclined can be eliminated,
The crawler 2 acts so as to ascend to the mountain side, thereby reducing the slip to the valley side.

The crawler frames 30 of the left and right crawlers 2
Around the rear axle 8 with the ball metal 34 interposed therebetween,
Or, by supporting it around the rear axle housing 13,
It is provided to be steerable left and right with respect to the traveling direction. A pin 37 is connected by a steering rod 36 between steering arms 35 projecting in the front-rear direction from the left and right crawler frames 30.
The left and right crawler frames 30 are steered by moving the steering rod 36 left and right.

The steering rod 36 includes a steering wire 38
Through the steering wheel 15, the front wheel 9 and the crawler 2 can be steered in the same direction. The ball metal 34 of the crawler frame 30 has a vertical steering pin 39 and is rotatably supported by a support bracket 40 projecting from the rear axle housing 13 side. The ball metal 34 is rotated around the pin 39 and the steering pin 39 is moved with respect to the rear axle 8.
Is steerably supported.

7 and 8 are different from the above example in that
Front axle housing 4 on which front wheel 9 is mounted
1 is rotatably supported on a front axle bracket 42 via a pivot metal 43, and the pitman arm 44 is rotated by the steering handle 15 on the front axle bracket 42 for fixing the pivot metal 43. A fulcrum pin 45, which is the center, is attached, which resists a large steering force acting on the tie rod 46, the pitman arm 44, etc., thereby increasing strength and maintaining stable steering.

A front axle housing 41 having front wheels 9 supported on the left and right ends so as to be steerable around steering pins 47 is a front axle bracket integrated with a front frame 48 on which an engine at the front of the vehicle body 7 is mounted. 42
Is supported by the pivot metal 43 in a freely rolling manner. The pivot metal 43 is integrally formed with a bolt 53, welding, or the like below the front axle bracket 42, and an integrated center pivot case 49 is rotatably fitted to a central rear side surface of the front axle housing 41. To support.

The rear end of the center pivot case 49 is connected to a shaft cover 51 of a front wheel take-out shaft 50 taken out from the rear transmission case 12 side. Further, the front wheel take-out shaft 50 is linked with a front differential gear 52 at a central portion in the front axle housing 41 so that the left and right front wheels 9 are connected.
Link to. The pitman arm 44 is located above the front axle bracket 42 and has a fulcrum pin 45.
Rotate around. Numeral 54 denotes a sleeve integral with the pitman arm 44, which is rotatably fitted around an integral fulcrum pin 45 of the front axle bracket 42. Left and right tie rods 4 are located behind the pitman arm 44.
6 are connected, and the left and right front wheels 9 and the steering arm 55 are steered and interlocked.

An arm 56 protrudes from one side of the sleeve 54. A drag rod is provided between an outer end of the arm 56 and an arm arm 58 rotated by a steering shaft 57 on the steering handle 15 side. 59
And are linked by steering. The fulcrum pin 45 of the pitman arm 44 is
Are welded to the integral front axle bracket 42, and the strength is enhanced by the double configuration of the pivot metal 43 and the front axle bracket 42, so that a simple configuration and a stable support configuration can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a driving sprocket.

FIG. 2 is a side view of the tractor.

FIG. 3 is a rear view thereof.

FIG. 4 is an exploded perspective view of a sprocket portion when a side ring is divided.

FIG. 5 is a plan view of the tractor.

FIG. 6 is a rear view of the crawler unit and an enlarged sectional view of a part thereof.

FIG. 7 is a plan view of a front axle housing part.

FIG. 8 is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center disk 2 Crawler 3 Guide protrusion 4 Drive protrusion 5 Crawler inner surface 6 Side ring

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // B62D 55/084 B62D 55/084

Claims (2)

[Claims] 1. A cylindrical projection 4 for engaging a guide projection 3 on the inner circumference of a crawler 2 is provided on a rotating peripheral portion of a sprocket 14, and an outer end face of the projection 4 is provided with a guide projection. A crawler sprocket having a side ring 6 for detachably attaching a side ring 6 for restricting left and right lateral movement of the child 3. 2. The sprocket of a crawler according to claim 1, wherein the side ring 6 is equally divided into a fan shape.