JP2688059B2 - Crawler-type traveling device lifting device for track-type traveling vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a device for elevating a pair of left and right crawler belt type traveling devices arranged below a traveling machine body of a crawler belt type traveling vehicle for combine and civil engineering work. It is a thing.

[Conventional technology]

In a track-type (infinite track type) traveling vehicle such as a combine equipped with a mowing pretreatment device in the front part of the traveling machine body or a backhoe for agricultural work or civil engineering work, work equipment or It is well known that a track frame in a pair of left and right crawler belt type traveling devices can be adjusted up and down with respect to the machine body frame in order to maintain a horizontal attitude of the traveling machine body equipped with a driver's seat.

In this case, the tip of a lever whose one-way portion or one end is rotatably pivoted up and down on the machine frame side is attached to the track frame, and the track frame is moved up and down via this lever that is vertically rotated by a hydraulic cylinder. Are disclosed in, for example, JP-A-58-224609, JP-A-61-183785, JP-A-63-96981, JP-A-63-63346, and the like.

For example, in Japanese Utility Model Laid-Open No. 61-183785, a pair of front and rear track frames, which are elastically connected in the front-rear direction, are arranged below the body frame, and an idler mounted at the front end of the front track frame. Tracks on the sprocket mounted on the rear end of the rear track frame, the wheel wheels arranged on each of the front and rear track frames, and the upper idler mounted on the downwardly projecting portion of the body frame at the front and rear center position. While the (crawler) is wound around, the front track frame is connected to the rear track frame by a linear lever extending downward from the frontward and downward center portion of the body frame at the front and rear center position. Is connected by a linear lever that extends rearward and downward from the downwardly projecting portion of the fuselage frame at the front-rear center position, while traveling Sideways inverted C-shapes from the front and rear ends of the body, and the two hydraulic cylinders pivotally attached to the middle of each lever rotate the levers up and down to adjust the left and right crawler type traveling devices respectively. A configuration is disclosed.

[Problems to be solved by the invention]

However, according to this structure, when the crawler type traveling device is raised with respect to the machine body frame, the horizontal portion and the upper idler projecting downward at the front-rear center position of the machine body frame are extremely close to the field scene. In addition, there is a problem that the mud lifted by the track is likely to collect in the horizontal portion and the upper idler.

On the other hand, according to the elevation adjustment device for the left and right crawler type traveling devices disclosed in Japanese Utility Model Laid-Open No. 63-63346, the track frame (movable frame) to be arranged below the machine frame in the front-rear posture that constitutes the traveling machine is The front and rear movable frames are divided into two parts, and the front and rear ends of a pair of front and rear bell crank levers pivotally supported by the body frame are attached to the front and rear movable frames. The movable frame is pivotally supported at one point at the lower end of the corresponding bell crank lever, and the front and rear movable frames do not always move up and down in parallel.

In addition, since the drive sprocket and the tension sprocket are attached and fixed to the front and rear ends of the body frame, the track and hence the front and rear movable frame cannot be increased or lowered by a large amount, and therefore the vertical gap between the body frame and the front and rear movable frame is small. In the meantime, there is a problem that mud is likely to collect and cleaning / inspection is difficult, and further, there is a problem that the mud is likely to be clogged in a portion between the front and rear movable frames (large diameter idler wheels).

Further, in Japanese Utility Model Laid-Open No. Sho 63-96981, the body frame and the track frame are connected to each other through a pair of front and rear bell crank levers so that they can move up and down in parallel with each other in the longitudinal direction, Since the sprocket is attached to the front end of the machine frame, the tension sprocket is attached to the rear end side of the track frame, and there is no upper idler roller (upper wheel) for supporting the upper side of the crawler track, the track is There is a problem that the upper side of the track is not supported between the drive sprocket and the tension sprocket, and it tilts forward and backward in a side view, and the long upper side of the track is not stable. As a result of not being able to increase the vertical movement amount that increases the vertical distance between the track frame and , The problem that it was difficult to remove the mud clogging between the truck frame and the body frame could not be solved.

The present invention is directed to overcoming these prior art problems.

[Means for solving the problem]

In order to achieve this object, a lifting device for a crawler type traveling device according to the present invention is a crawler type traveling vehicle in which a pair of left and right crawler type traveling devices are independently provided to be vertically moved below a body frame. A pair of front and rear bell crank levers, each of which has a halfway portion pivotally pivoted up and down on the body frame side, are pivotally attached to one track frame in each of the left and right crawler belt type traveling devices. By driving the hydraulic cylinders for raising and lowering, the rear end arm portions of the pair of front and rear bell crank levers are configured to be vertically rotated, while the lower surface of the machine body frame and the upper surface of the track frame are arranged in the forward and backward directions of the traveling machine body. Are formed so as to be substantially linear and parallel to each other in a side view, and the drive sprocket is located at the front position of the bell crank lever. It is provided at a front portion of the body frame projecting forward, and the front end side of the crawler belt in each of the left and right crawler belt type traveling devices is wound around the drive sprocket, and the tension is attached to the rear end of each track frame. The rear end of each crawler belt is wrapped around a sprocket, and the front-rear midway part of the upper side part of the crawler belt is supported by an upper roller wheel projecting outside the fuselage frame between the pair of bell crank levers. The lower side of the crawler belt is supported by a plurality of idle wheels arranged on the track frame.

[Functions and Effects of the Invention]

In the present invention, the lower surface of the machine body frame and the upper surface of the track frame are formed so as to be substantially linear in the front-rear direction of the traveling machine body and parallel to each other in a side view. Since the track frame and the machine body frame are connected to each other in the front and rear through a plurality of bell crank levers, and the tip arm portions of the plurality of bell crank levers extend in the same rearward direction, the lifting hydraulic cylinder can be driven. For example, the track frame can move up and down in parallel with the body frame.

Then, the front end side of the crawler belt is wound around a drive sprocket provided at a position that is forward of the position of the bell crank lever at the front position and protrudes in the front direction from the machine body frame, and at the rear of each track frame. The rear end of each crawler belt was wound around the tension sprocket attached to the end, and the front and rear midway part of the upper side part of this crawler track was protruded to the outside of the fuselage frame between the pair of bell crank levers. Because it is supported by the upper wheels,
Even if the crawler type traveling device is changed up and down, the posture of the upper side of the crawler belt is changed only between the upper sprocket and the tension sprocket behind the upper sprocket, and only the rearward and downward inclination angle fluctuates. The attitude of the track does not fluctuate up and down, and even if the lower side of the track is displaced so as to follow the unevenness of the ground, the upper side of the track can be supported by the drive sprocket and the upper wheel in an appropriate posture, and Even if various parts are arranged on the machine body frame or the track frame between the drive sprocket and the upper wheel, there is an effect that it does not interfere with the crawler tracks.

Further, with the above configuration, when the crawler belt traveling device is largely lowered with respect to the body frame, a large gap can be formed between one track frame and the body frame in a side view, and the body frame can be The lower surface and the upper surface of the track frame are formed so as to be substantially straight in the front-rear direction of the traveling machine body and parallel to each other in a side view, and moreover, the upper rollers are the side surfaces of the machine body frame. Since it is located at the position projecting outward from, it is possible to clean and inspect the mud during that time very easily.

〔Example〕

Next, a description will be given of an embodiment in which the present invention is applied to a combine that is an agricultural work machine. Reference numeral 1 is a combine traveling machine body, and below the traveling machine body 1, there are a pair of left and right parts that are vertically driven with respect to the traveling machine body 1. Crawler type traveling devices 2a, 2b are provided.

At the front end of the machine body frame 3 of the traveling machine body 1, the machine frame 4
The mowing pretreatment device 5 is mounted so as to be adjustable up and down, and the mowing pretreatment device 5 is provided with a plurality of left and right weeders 6 at the lower end of the lower frame of the machine frame 4 and a left and right longitudinal mowing at the rear position thereof. A mechanism 7 is provided, a plurality of grain culm elevating devices 8 are provided on the front surface of the machine frame 4, and a scraping wheel and a tip tip conveying device 9a for conveying grain culm to a starting end of a feed chain 10 to be described later are provided behind it. It is provided with a grain culm vertical conveying device 9 including an original conveying device 9b, and is configured to be able to maintain a predetermined cutting height by detecting a ground height of a cutting height sensor (not shown).

On the upper surface of the machine body frame 3, facing the traveling direction of the traveling machine body 1, a threshing device 11 with a feed chain 10 on the right side is provided.
On the left side, there is provided a paddy tank 12 for accumulating the paddy that has been threshed by the threshing device 11, and in front of the paddy tank 12, a driver's seat 13
Is provided.

Further, drive sprocket 16, 16 which transmits power from an engine (not shown) to the reaping pretreatment device 5 via the transmission case 14 and is rotatably attached to both left and right sides of the transmission case 14 in the traveling machine body 1. Is driven to rotate, and the front ends of the crawler belts 17 and 17 on both left and right traveling devices 2a and 2b, which will be described later, are wound and driven by the both drive sprockets 16 and 16.

The left and right traveling devices 2a, 2b each include a front and rear longitudinal track frame 18 having a hollow rectangular cross section, and the respective track frames.
A biasing means such as a coil spring whose tension can be adjusted at the rear end of 18
Tension sprocket biased backwards through 19 20
A plurality of idler wheels 22 and inner wheel 22 ′ each of which is rotatably supported by a shaft 21 at appropriate intervals in the front-rear direction of the track frame 18.
A pair of front and rear arms 24 and 24 that are rotatably attached to the support shaft 23 independently of each other in the middle of the front and rear of the track frame 18.
It consists of equalizer wheel 25,25 mounted via
The idle wheel is attached to the lower surface (lower side) of the inner circumference of the crawler belt 17 wound between the tension sprocket 20 and the drive sprocket 16.
The pair of equalizer rolling wheels 25, 25 are in contact with each other, and the pair of equalizer rolling wheels 25 urges each arm 24 so as to press the crawler belt 17 downward.

The first wheel 26 is composed of the drive sprocket 16 and the inner wheel 22 '.
And a supporting member for supporting a lower side front part of the crawler belt 17 between the crawler belt 17 and the supporting member 17 and protruding downward from the front end of the body frame 3.
The first rolling wheel 26 is supported via 15. The second rolling wheel 27 as an upper rolling wheel is arranged between the drive sprocket 16 and the tension sprocket 20 and between the pair of front and rear bell crank levers 32, 32. The wheel 27 is attached outward from the side surface of the machine body frame 3 and supports the front-rear midway portion on the upper side of the crawler belt 17. The direction of arrow A in FIG. 5 is the forward direction of the traveling vehicle body 1.

A pair of left and right longitudinal chassis 30, 30 are provided in the lower part of the machine frame 3 having a rectangular frame shape in plan view, and the left and right chassis 30, 30 are respectively provided with brackets 3 at appropriate front and rear positions.
The pipe-shaped support shafts 33, 33 mounted via 1, 31 are rotatably fitted with the middle parts of the bell crank levers 32, 32, and the front and rear ends of the pair of front and rear bell crank levers 32, 32 are mounted. The arm portions 32a, 32a are respectively a pair of left and right track frames 18,
It is arranged so as to extend rearward along the inner surface of 18 (see FIGS. 4 and 5).

The front end arm portions 32a of the pair of front and rear bell crank levers 32 are rotatably fitted to a pipe support shaft 39 that is mounted inwardly on the track frame 18, while the other end arm portions 32b of the front and rear bell crank levers 32 are attached. The adjacent ends are connected by a connecting rod 34, and the other end arm portion 32b of either the front or rear bell crank lever 32 is pivotally connected to the tip of a piston rod of a hydraulic cylinder whose rear end is pivotally supported by a support bracket 35 on the body frame 3. Wear (see FIG. 5), the pair of left and right hydraulic cylinders 36a, 36
When 36a on the left side of b is operated, the track frame 18 in the traveling device 2a on the left side (the right side of the traveling machine body when viewed from the rear) moves up and down, the traveling machine body 1 on that side moves up and down, and the right hydraulic cylinder Each of the traveling devices is independently operated so that the traveling device 2b on the right side (the right side when the traveling machine body is seen from the rear) is driven up and down by operating 36b.

When the piston rod of each hydraulic cylinder projects, the track frame 18 associated therewith moves downward, and further, each bell crank lever 32
When the tip arm part 32a attached to the track frame 18 is rotated within a range of approximately 45 degrees rearward from the substantially horizontal state and the tip arm part 32a is substantially horizontal, the traveling body 1 is in the lowest position. The traveling body 1 is configured to correspond to the maximum raised lower state when the tip arm portion 32a is at an appropriate rear downward angle within approximately 45 degrees rearward downward from the horizontal.

Further, a vertical reaction force due to the weight (P) of the combine is applied upward to each of the tip arm portions 32a, whereas the upper side of the crawler belt 17 is pulled forward when the traveling body 1 advances (μP = traction force, here Then, the forward horizontal reaction force due to the traction coefficient μ ≦ 1) respectively acts.

Then, when the tip arm part 32a is an appropriate rear-down angle within approximately 45 angles rearward and downward from the horizontal, the vertical component of the arm length from the tip part to which the tip arm part 32a is attached to the track frame to the support shaft 33 is horizontal. Since it is shorter than the component, each of the tip arm portions 32a is in the most erected state (approximately 45
When the angle is the same as the vertical component and the horizontal component of the arm length), the moment that the tip of the tip arm portion 32a rotates backward is greater than the moment that the tip of the arm portion 32a rotates backward. Also, the tip arm portion 32a does not move carelessly in the upright direction, and the track frame 18 is free to rise.

Therefore, the force for axially compressing the tip arm portion 32a of each bell crank lever 32 does not act inadvertently, and the possibility of buckling of the tip arm portion is reduced.

Further, in order to associate the hydraulic cylinder with the bell crank lever so that when the piston rod of the hydraulic cylinder projects, the tip arm portion of each bell crank lever 32 moves in the direction of downward rotation, It is also possible to adopt a single-acting hydraulic cylinder in which hydraulic pressure is actuated in the piston rod protruding direction, and it is also possible to simplify the control management of the retracting movement of the piston rod of each hydraulic cylinder.

In the illustrated embodiment, by connecting a pair of front and rear bell crank levers 32 with a connecting rod 34, one of the front and rear bell crank levers is rotationally driven by a hydraulic cylinder. Although the connecting rod 34 is omitted and the hydraulic cylinders are associated with the respective bell crank levers 32, the track frame 18 moves horizontally according to the protruding and retracting amounts of the piston rods of the front and rear hydraulic cylinders. It is also possible to raise or lower it while tilting it back and forth.

Further, it goes without saying that two or more bell crank levers may be provided at the front and rear.

Further, the posture automatic control for operating both the left and right hydraulic cylinders is executed so that the tilt sensor provided on the traveling machine body 1 or the like detects a left-right inclination, and the preset left-right inclination angle or the horizontal state of the traveling machine body 1 is maintained. You can
By manually operating both the left and right hydraulic cylinders simultaneously to raise and lower the left and right of the traveling machine, or by manually operating one of the left and right hydraulic cylinders, the left and right inclination of the traveling machine can be set arbitrarily. Is also good.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a side view of a combine, Fig. 2 is a front view, Fig. 3 is a partial side view of a traveling machine body in a raised state, and Fig. 4 is an enlarged side view of essential parts. 5 is a plan view taken along line VV of FIG. 4, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 1 ... Traveling machine, 2a, 2b ... Traveling device, 3 ... Machine frame, 5 ... Mowing pretreatment device, 11 ... Threshing device, 12 ...
Paddy tank, 13 ... Driver's seat, 16 ... Drive sprocket, 17
…… Crawler track, 18 …… Track frame, 19 …… Biasing means,
20 ...... Tension sprocket, 27 ...... 2nd rolling wheel as upper rolling wheel, 32 ...... Bell crank lever, 32a ...... Tip arm part, 34 ...... Connection rod, 36a, 36b ...... Hydraulic cylinder.

Continuation of the front page (56) Reference JP-A-1-182181 (JP, A) Actually opened 63-96981 (JP, U) Actually opened 63-63346 (JP, U) Actually opened 61-183785 (JP , U)

Claims (1)

(57) [Claims] 1. A crawler belt-type traveling vehicle comprising a pair of left and right crawler belt-type traveling devices which are independently lifted and lowered below a body frame. The rearward-facing tip arms of a pair of front and rear bell crank levers that are pivotally supported are respectively pivotally attached to one track frame in each of the left and right crawler belt type traveling devices, and the pair of front and rear bell cranks are driven by driving a lifting hydraulic cylinder. Each rear end arm portion of the lever is configured to rotate up and down, while the lower surface of the machine frame and the upper surface of the track frame are substantially linear in the front-rear direction of the traveling machine body and are in a side view. The drive sprocket is formed so as to be parallel in the vertical direction, and the drive sprocket is projected from the position of the bell crank lever at the front position in front of the fuselage frame. The front end side of the crawler belt in each of the left and right crawler belt type traveling devices is wound around the drive sprocket, and the rear end of each crawler belt is wound around the tension sprocket mounted on the rear end of each track frame. Further, the front and rear midway portions of the upper side of the crawler belt are supported by upper rolling wheels projecting outside the machine body frame between the pair of bell crank levers, and the plurality of idle rolling wheels of the track frame are used to link the crawler belt. An elevating device for a crawler-type traveling device, characterized in that the lower side part is supported.