JPH0212793B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for adjusting the height and lateral inclination of various agricultural vehicles such as combines, transport vehicles, and working vehicles such as earthmoving machines. This invention relates to a crawler traveling device with functions.

[Conventional technology]

Conventionally, when the aircraft has sunk into soft ground, it has been used as a means to lift the aircraft to a desired level on the ground surface, or to maintain the aircraft horizontally from side to side on sloped or undulating ground. As shown, a crawler traveling device in which the ground contact side of the crawler belt is hydraulically raised and lowered relative to the aircraft body is known.

[Problem that the invention seeks to solve]

However, the above-mentioned known technology has drawbacks such as the mechanical durability of the swing link for raising and lowering the ground contact side of the crawler belt, the durability of the crawler belt, the resistance to derailment, and the maintainability of the hydraulic cylinder for raising and lowering. ,
It was difficult to put it into practical use as it was.

In other words, in the above-mentioned known technology, a spring-biased automatic crawler tensioning ring is mounted on the aircraft frame side, and the automatic crawler tensioning ring is elastically moved back and forth in response to the lifting and lowering of the ground contacting part of the crawler belt relative to the aircraft. Since the wrapping circumference of the crawler belt is automatically adjusted to a constant value, the tension of the crawler belt fluctuates greatly as the crawler belt moves up and down with respect to the aircraft frame on the ground contact side, and if the reference tension is set too high, the crawler belt will When the ground contact side of the belt descends relative to the aircraft body, excessive tension is created, reducing the durability of the crawler belt. Conversely, if the standard tension is small, the tension increases when the ground contact side of the crawler belt rises relative to the aircraft body. The standard spring biasing force of automatic crawler tension wheels is
In other words, the standard tension of the crawler belt had to be set to a value that is insufficient for both the durability and derailment resistance of the crawler belt.

In addition, the swing link mechanism for raising and lowering the crawler ground contact side connects the fuselage frame and the support frame via a pair of front and rear swing links, and also connects one swing link and the fuselage frame with hydraulic pressure. It has a structure in which a cylinder is installed, or a structure in which the fuselage frame and the support frame are connected via a pair of front and rear bending swing links, and a hydraulic cylinder is installed between both bending swing links. In the former configuration, only one swing link acts as a drive link that receives the driving force of the hydraulic cylinder, so the lift load concentrates on this one swing link, causing play in the fulcrum part at an early stage. It was easy to cause problems such as

In addition, in the latter configuration, which uses bent-back swing links to raise and lower in a pantograph style, the front and rear bend-able swing links are each driven by hydraulic cylinders, which is effective in distributing the load back and forth.
Since there are many link fulcrums between the fuselage frame and the support frame, durability against lateral loads tends to be low.

In addition, in both configurations, because the hydraulic cylinder is installed in the crawler traveling device, mud not only adheres to the sliding surface of the piston rod of the hydraulic cylinder, but also to the piping that connects the hydraulic cylinder to the aircraft side. Therefore, the hydraulic seals of the hydraulic cylinders and the seals of the piping connections were easily damaged.
Furthermore, when the muddy soil grows and becomes clod-like, the clod acts as a propulsion resistance when driving on soft ground.

The present invention is a type in which a support frame is driven up and down by a hydraulic cylinder via a swing link mechanism.
By improving the lifting device that uses a swing link, we have solved the problems of the conventional technology with a simple structure.
It is an object of the present invention to provide a crawler traveling device that can satisfactorily adjust the height of the machine body and the left and right inclination of the machine body.

[Means for solving problems]

The characteristic structure of the present invention for achieving the above object is as follows:
A crawler tension wheel is provided beside the support frame of the crawler ground contact wheel, and the swing link mechanism is
Front and rear first swing links that connect the fuselage frame and support frame, and front and rear second swing links that extend upward so as to be able to swing integrally with each first swing link on the inside of the machine from the crawler belt. and a rod connecting the front and rear second swing links, and the hydraulic cylinder is provided across the second swing links and the body frame.

[Effect]

According to the above configuration, for example, in FIG. 2, the driving force of the hydraulic cylinder 14 is transmitted to the rear first swing link 11b via the rear second swing link 12, and the driving force is transmitted to the rear first swing link 11b, and The first swing link 11a in the front via the swing link 11a
It can also be conveyed. In other words, the front and rear first swing links 11a and 11b each work as a drive link, and distribute the driving force of the hydraulic cylinder 14 back and forth to drive the support frame 6 downward in a good load balanced state. These first and second swing links 11a, 11
b, 12, the crawler tensioning wheel 8 and the support frame 6 of the crawler grounding section wheel 7 move together, and the crawler belt 9 is brought into contact with the ground while the tension of the crawler belt 9 does not change significantly. The part side moves up and down relative to the aircraft.

Furthermore, since the hydraulic cylinder 14 is installed between the second swing link 12 extending upwardly inside the crawler belt 9 and the body frame 2, the hydraulic cylinder 14 is installed over the body frame 2 and the second swing link 12, which extends upward from the crawler belt 9. It is possible to set and place the parts where it is difficult to adhere.

〔Effect of the invention〕

Therefore, according to the present invention, the load can be distributed between the front and rear of the swing link mechanism, and the support frame can be smoothly driven up and down, thereby avoiding the application of a large load locally, thereby improving mechanical durability. was able to increase

In addition, by providing a crawler tensioning wheel on the support frame of the crawler grounding section wheel and moving the crawler tensioning wheel up and down with the support frame relative to the aircraft body, the tension force of the crawler belt can be kept almost constant. It is now possible to reliably move up and down relative to the aircraft while keeping the crawler belt on the ground-contacting part side in a state where it is difficult for wheels to come off.

In addition, since the hydraulic cylinder is installed in a local area on the machine body where mud is less likely to adhere, there is less mud buildup on the hydraulic cylinder itself or hydraulic piping, which not only prevents damage to the hydraulic seal but also prevents mud from sticking. It is now possible to travel easily over soft ground without increasing the propulsion resistance due to the clods that have formed.

〔Example〕

As shown in FIG. 3, the front part of the traveling machine is equipped with a pair of left and right crawler traveling devices 1, 1 and is equipped with a threshing device 3 to raise and reap the planted grain culms, and to thresh the reaped grain culms. A combine harvester is constructed by providing a pre-processing device 4 for supplying to the device 3.

Since both the left and right crawler traveling devices 1, 1 have the same structure, only the left crawler traveling device 1 will be described below.

As shown in FIGS. 1 and 2, a crawler drive wheel 5 is attached to a body frame 2 constituting a traveling body through a transmission case 10, and a swing link mechanism 11, which will be described later, is attached to the body frame 2. A crawler belt 9 made of rubber is wound around each of a plurality of crawler ground contact wheels 7 and crawler tension wheels 8 attached to a support frame 6 connected to each other. The crawler driving wheel body 5 is driven by the crawler belt 9, thereby driving the crawler belt 9.

The swing link mechanism 11 includes a pair of front and rear first swing links 11a, 11b and a sub swing link 20. The support frame 6 is connected to the respective free ends of the front and rear pair of first swing links 11a, 11b, and a hydraulic cylinder 14 is interlocked with the pair of first swing links 11a, 11b. The support frame 6 can be raised and lowered relative to the body frame 2 by means of a hydraulic cylinder 14 serving as a drive mechanism. The hydraulic cylinders 14 are arranged on the left and right sides so that the support frame 6 on the right side can be raised and lowered in the same way, and by operating these hydraulic cylinders 14 and 14 separately, the inclination of the aircraft with respect to the ground on which it is traveling is adjusted. It is adjustable and height adjustable.

To be more specific, the first swing links 11a, 11
the fuselage frame 2 so as to swing integrally with b.
The free ends of the second swing links 12, 12 pivotally connected to each other are interlocked and connected by a rod 13, and the piston rod 14a of the hydraulic cylinder 14 is connected to the link 12 on the rear side. The crawler drive increases as the support frame 6 descends with respect to the fuselage frame 2 due to the swinging so that the pair of front and rear first swing links 11a, 11b swings via the second swing link 12. It is designed to move up and down with respect to the body frame 2 while moving toward the wheel body 5 side. Since the support frame 6 moves toward the crawler drive wheel 5 as it descends, the wrapping length of the crawler belt 9 over all the wheels 5, 7, . , and the degree of tension do not change or do not change significantly from before the lift.

Reference numeral 15 in FIG. 2 is an idling wheel body, and a support arm 16 for supporting this idling wheel body 15 is provided in a state that it can freely swing up and down around the horizontal axis and is biased toward the downward side. ing.

Reference numeral 17 in FIGS. 1 and 2 is a screw shaft for adjusting the tension of the crawler 9, and by operating a rotary operation section 17a provided on the screw shaft 17, the support frame 6 is rotated. On the other hand, a slide frame 18 equipped with the crawler tensioning wheel 8
The tension of the crawler belt 9 is adjusted and fixed by expanding and contracting it in the front and rear directions. Further, reference numeral 19 in FIG. 2 is a rubber that also serves as a cushion material for regulating the highest position of the support frame 6. Further, the sub-swing link 20 prevents the first swing links 11a, 11b from being twisted due to assembly errors.

[Another example]

In the embodiment described above, the inclination of the aircraft body relative to the ground is adjusted by raising and lowering both the support frames 6, 6, but it may be carried out by raising and lowering only one of the support frames 6.

INDUSTRIAL APPLICATION This invention is applicable not only to a combine harvester but also to various work vehicles equipped with a crawler traveling device, such as a transport vehicle and an earthmoving machine.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the crawler traveling device for a work vehicle according to the present invention, FIG. 1 is a cutaway plan view of the crawler traveling device, FIG. 2 is a side view of the crawler traveling device, and FIG. 3 is a side view of the entire combine harvester. It is a diagram. DESCRIPTION OF SYMBOLS 1...Crawler traveling device, 2...Body frame, 5...Crawler drive wheel, 6...Support frame, 7...Crawler ground contact portion wheel, 8...Crawler tension wheel, 9... Crawler belt, 11...
... Swinging link mechanism, 11a, 11b... First swinging link, 12... Second swinging link, 13... Rod, 14... Hydraulic cylinder.

Claims (1)

[Claims] 1 Crawler drive wheel body 5 of crawler traveling device 1
is provided beside the fuselage frame 2, and the support frame 6 of the crawler grounding portion wheel 7 is connected to the fuselage frame 2 via the swing link mechanism 11 so as to be able to rise and fall relative to the fuselage frame 2, and the swing link mechanism 1
1 is configured to be driven by a hydraulic cylinder 14, the crawler tension wheel 8 is provided beside the support frame 6 of the crawler ground contact wheel 7, and the swing link mechanism 11 is connected to the body frame 2 and the support frame 6. Front and rear first swing links 11 connecting the frame 6
a, 11b, and front and rear second swing links 12, which extend upwardly so as to be able to swing integrally with each of the first swing links 11a, 11b on the inside of the body from the crawler belt 9.
12, and a rod 13 connecting the front and rear second swing links 12, 12, the second swing link 1
A crawler traveling device for a work vehicle, characterized in that the hydraulic cylinder 14 is provided across the body frame 2 and the body frame 2.