JPH0840322A - Crawler running device for work vehicle - Google Patents

Abstract

PURPOSE:To lower car height by eliminating lowering of the lowest ground height of a machine body with height increased. CONSTITUTION:In a crawler running device of a work vehicle connecting liftably a truck frame 1a to a machine body frame 3 through a pair of front/rear swing arms 12, 13, a drive member 21 extended between the machine body frame 3 and the one swing arm 13 to give swivel action to the one swing arm 13 and a connecting rod 19 extended between the front/rear swing arms 12, 13 to transmit swivel action of the swing arm in a drive side to the other swing arm 13 are provided in equal height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device for a working vehicle such as a combine or a carrier.

[0002]

2. Description of the Related Art A vehicle height can be adjusted by raising and lowering left and right track frames of a crawler traveling device at the same time with respect to a machine body frame, and by raising and lowering them separately, it is possible to keep the machine body horizontal.

The left and right sides of the track frame are movably connected to the body frame via a pair of front and rear swing arms, and one swing arm is driven by a driving member such as a hydraulic cylinder stretched between the swing arms and the body frame. A swinging motion is given, and the other swing arm is interlocked with the drive side swing arm by a connecting rod stretched between the swing arm and the drive side swing arm.

The drive member and the connecting rod are mounted vertically.

[0005]

In the above prior art, since the drive member and the connecting rod are mounted vertically, a large space is required above and below, the vehicle height (center of gravity) becomes high, and running stability is poor. In addition, if the vehicle height is reduced, the minimum ground clearance of the aircraft becomes low, which is disadvantageous for traveling on a wetland or an unevenly conditioned ground. Further, since the arm ratio of the front and rear swing arms is different, the lifting load of the front and rear swing arms is different, and there is a problem that stable lifting and lowering cannot be performed.

An object of the present invention is to provide a crawler traveling device for a working vehicle, in which the vertical space for mounting the drive member and the connecting rod is made as narrow as possible so as to solve the conventional problems. To do.

[0007]

SUMMARY OF THE INVENTION A crawler traveling device for a working vehicle according to the present invention is a crawler traveling device for a working vehicle, wherein a track frame is movably connected to a machine frame via a pair of front and rear swing arms. A drive member that is stretched between one swing arms to give a swinging motion to one swing arm, and a swinging member that is stretched between the front and rear swing arms to transmit the swinging motion of the drive side swing arm to the other swing arm. The connecting rod and the connecting rod are provided at the same height.

[0008]

[Operation] Therefore, since the drive member and the connecting rod are provided at the same height, the vertical space for mounting the drive member and the connecting rod can be minimized, and the arm ratio of the front and rear swing arms can be the same. Become.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a sectional side view of the crawler traveling device, FIG. 2 is an overall side view of the combine, and FIG. 3 is a plan view thereof.
a) (1b) is a track frame provided with left and right traveling crawlers (2a) (2b), and (3) is a machine frame provided on the track frames (1a) (1b), which is a machine frame (3). The threshing unit (4), the grain tank (5), the engine (6), and the operation unit (7) are mounted on the upper part, and the mowing unit (8) is installed in the front of the body frame (3) so as to be able to move up and down. , The combine aircraft is configured.

As shown in FIGS. 4 to 7, the front and rear swings parallel to the left-right direction of the machine are located below the left and right main frames (3a) (3b) of the machine frame (3) parallel to the traveling direction of the combine machine. The fulcrum shafts (9) and (10) are laid horizontally. Both ends of the front and rear swing fulcrum shafts (9) and (10) are rotatably supported on the lower surfaces of the left and right main frames (3a) and (3b).

The front and rear swing fulcrum shafts (9) (10)
Each of the left and right swing arms (12) (13) is rotatably supported by an intermediate portion thereof, and the front and rear pivot frames parallel to the left-right direction of the aircraft are respectively mounted on the upper surfaces of the left and right track frames (1a) (1b). The support shafts (14) and (15) are fixed and the front and rear pivot shafts (14) (1) of the left track frame (1a) are fixed.
5) is rotatably supported on one end of the left and right swing arms (12) (13), while the front and rear pivot shafts (14) (15) of the right track frame (1b) are supported on the right front and rear. One end of the swing arms (12) (13) is rotatably supported by bearings, and the left and right track frames (1a) (1
b) front and rear swing arms (12) (1)
It is connected to the body frame (3) via 3) so as to be able to move up and down. That is, the left main frame (3a), the track frame (1a), and the front and rear swing arms (12) (1
3) constitutes a set of parallel link mechanisms, and the right main frame (3b), the track frame (1b), and the front and rear swing arms (12) and (13) constitute a set of parallel link mechanisms.

Further, the left and right connecting arms (16) are integrally extended in the radial direction from the front and rear swinging fulcrum shafts (9) and (10), and the tip ends of the left and right connecting arms (16) are swinging fulcrum shafts. (9) The horizontal axes (17) and (18) parallel to (10) are integrally connected, and the other ends of the front left and right swing arms (12) are rotatably fitted to both ends of the front horizontal axis (17). On the other hand, the other side of the rear left and right swing arms (13) is rotatably fitted to both ends of the rear side horizontal shaft (18), and the front left and right swing arms (12) are connected to the front side. Axis (17)
In addition, the left and right swing arms (13) on the rear side are interlockingly connected by the horizontal axis (18) on the rear side, and the interlocking connection structure eliminates twisting of the horizontal axes (17) and (18), and the front and rear sides. The left and right swing arms (12) and (13) are configured to surely match the swinging motions.

Further, right and front connecting arms (16)
Connecting rod (19) and connecting pin (4)
0) and (41) for interlocking connection, and the left rear connecting arm (16) and the left and right main frames (1a)
Connecting pin (4) between connecting frames (20) between (1b)
2) An elevating cylinder (21) driven by hydraulic pressure, air pressure or electric power is stretched via (43), and the swing arms (12) (13) on the front, rear, left and right are integrated by the expansion and contraction operation of the cylinder (21). It is configured to be oscillated, and the truck frames (1a) and (1b) are simultaneously moved up and down in the same direction in the left and right directions to adjust the vehicle height.

The connecting rod (19) and the elevating cylinder (21) are arranged side by side at the same height to minimize the vertical space for mounting the connecting rod (19) and the elevating cylinder (21). The front and rear swing arms (12) and (13) have the same arm ratio (L1 / L3 =
L2 / L4).

A transmission case (22) to which power is transmitted from the engine (6) is attached to the front end side of the machine body frame (3), and the transmission case is provided at the left and right separate output shaft ends of the transmission case (22). Driven sprockets (2
By 3), the left and right traveling crawlers (2a) (2b) are individually driven. Also, the left and right track frames (1
A plurality of lower rollers (24) and (25) for supporting the ground contact portions of the traveling crawlers (2a) and (2b) and one tension adjusting idler wheel (26) are attached to a) (1b). Further, the left and right traveling crawlers (2a) (2b) are supported on the non-grounded side by one upper wheel (27) attached to the machine body frame (3).

Among the plurality of lower rolling wheels (24) (25) mounted on the track frames (1a) (1b), the two lower rolling wheels (24) on the front side and the two lower rolling wheels (24) on the rear side are the same as the track frame
a) It is rotatably provided on a support shaft (28) ...
The two central lower rolling wheels (25) arranged between the rear lower rolling wheels (24) and the rear two lower rolling wheels (24) are equalizer rolling wheels, which are fulcrum shafts fixed to the track frames (1a) (1b) ( 29)
A bearing plate (30) for rotatably supporting the middle portion of the equalizer is rotatably supported by a support shaft (31) in the front and rear, and a pair of front and rear equalizer wheels (25) around the fulcrum shaft (29).
Swings up and down. Then, as shown in FIG. 8, the upper roller (27) is provided on the left and right main frames (3a) (3b).
Is rotatably supported by a support shaft (32) pivotally fixed directly above the fulcrum shaft (29) of the equalizer rolling wheel (25), and the equalizer rolling wheel (25) is placed above the upper rolling wheel (2).
The upper rolling wheel (27) is brought into contact with 7) so as to also serve as a stopper for preventing the equalizer rolling wheel (25) from being reversed.

This embodiment is configured as described above, and the vehicle height is increased when the combine harvesting field is a wet field.
On the contrary, when the field is dry field, the vehicle height is lowered and the work is performed.

By extending the lifting cylinder (21), the front and rear swing arms (12) (13)
Swings clockwise and counterclockwise about the front and rear swing fulcrum shafts (9) and (10) at the same time, and the space between the body frame (3) and the left and right track frames (1a) and (1b) is widened. Raise. On the contrary, by contracting the lifting cylinder (21), the front and rear swing arms (12) and (13) simultaneously swing left and right counterclockwise about the front and rear swing fulcrum shafts (9) and (10). The space between the frame (3) and the left and right track frames (1a) (1b) is shortened, and the vehicle height is lowered.

In FIG. 9, the interlocking connecting members (16) (17) of the front left and right swing arms (12) provided on the front swing fulcrum shaft (9) and the rear swing fulcrum shaft (10). ) Rear left and right swing arms (1
The interlocking connecting members (16) and (18) of 2) are removed so that the left and right swing arms (12) and (13) provided on the coaxial shafts (9) and (10) can be individually swung, and the left and right front and back The other ends of the swing arms (12) and (13) are interlockingly connected with each other by a left connecting rod (19a), and the right and left swing arms (12) and (13) are interlockingly connected with each other by a right connecting rod (19b). Further, right and left lifting cylinders (21a) and (21b) are respectively stretched between the connecting frame (20) and the left and right swing arms (13) on the rear side, and the track frames (1a) and (1b) are left and right. By vertically moving the lifting cylinders (21a) and (21b) by expanding and contracting, the machine body can be maintained horizontally. Also in the above structure, the left connecting rod (19a) and the lifting cylinder (21a) that swing the pair of front and rear swing arms (12) and (13), and the right connecting rod (19b) and the lifting cylinder (21b). ) Are arranged side by side at the same height as in the above embodiment, and the left and right connecting rods (19a) (19b) and the lifting cylinders (21a) (21b) are also arranged side by side at the same height,
It is constructed so as to obtain the same effect as that of the above-mentioned embodiment.

[0020]

As is apparent from the embodiments described above, the present invention allows the track frame (1a) to be mounted on the body frame (3) via the pair of front and rear swing arms (12) and (13).
In a crawler traveling device for a work vehicle in which (1b) is vertically movable, one swing arm (13) is stretched between a body frame (3) and one swing arm (13).
Drive members (21) (21a) (21)
b) and the front and rear swing arms (12) and (13), and the connecting rods (19) and (19) are extended between the swing arms (12) and (13) to transmit the swinging motion of the drive side swing arm to the other swing arm (13).
Since a) and (19b) are provided at the same height, these drive members (21) (21a) (21b) and the connecting rod (1
9) The vertical space for mounting (19a) and (19b) can be minimized, and therefore the vehicle height can be lowered without lowering the minimum ground height of the aircraft to drive the vehicle. It is excellent in stability and can run well on a wetland or rough ground with unevenness, and the front and rear swing arms (12) and (13) can have the same arm ratio. Therefore, the lifting loads of the front and rear swing arms (12) and (13) are the same, and it is possible to perform stable lifting and lowering.

[Brief description of drawings]

FIG. 1 is a sectional side view of a crawler traveling device.

FIG. 2 is an overall side view of the combine.

FIG. 3 is an overall plan view of the combine.

FIG. 4 is an explanatory plan view of the crawler traveling device.

FIG. 5 is a sectional front view of the crawler traveling device.

FIG. 6 is a sectional rear view of the crawler traveling device.

FIG. 7 is a sectional front view of the crawler traveling device.

FIG. 8 is a partial side view of the crawler traveling device.

FIG. 9 is a sectional front view of a crawler traveling device showing another embodiment.

[Explanation of symbols]

(1a) (1b) Track frame (2a) (2b) Running crawler (3) Airframe frame (12) (13) Swing arm (19) (19a) (19b) Connecting rod (21) (21a) (21b) Lifting Cylinder (driving member)

Claims (1)

[Claims] 1. A crawler traveling device for a work vehicle in which a truck frame is vertically movable with a body frame via a pair of front and rear swing arms. A drive member that gives a swinging motion and a connecting rod that is stretched between the front and rear swing arms and transmits the swinging motion of the drive side swing arm to the other swing arm are provided at the same height. Crawler traveling device for working vehicles.