JP3516790B2 - Tail wheel mounting device for rotary tilling work machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail wheel mounting device for a rotary tilling work machine in a walking tractor. 2. Description of the Related Art As shown in FIG. 5, in a rotary tilling machine (R) mounted on a walking tractor (T),
The lifting and lowering support device (1) installed at the rear of the work machine frame (101)
02) with a caster angle to support the tail wheel (103),
The tail wheel (103) is configured to be moved up and down by the elevating and lowering support device (102) to set the plowing depth.
And the conventional general one is a rotary tilling work machine.
(R), the overall length of the walking type tractor (T) is made as short as possible, and the toe spacing of the operator who walks backwards while gripping the steering handle (104) is secured widely. As described above, the tail wheel (103) is arranged as close to the front as possible without interfering with the rotary rotary (105) of the rotary tilling machine (R). [0003] As described above, the tail wheel (1)
When operating a walking tractor (T) provided with a rotary tilling work machine (R) provided with a 03), the tail wheel (103) is largely lowered by a lifting support device (102) when operating on a road. FIG. 5 shows the rotary rotor (105) of the rotary tilling machine (R) with its tail wheel (103) and the traveling wheel on the side of the walking tractor inclined forward and low inclined about the traveling wheel axis. As shown in the above, it is operated while levitating to the ground, and at the time of tilling work, the tail wheel (103) is raised to a desired height by the lifting and lowering support device (102), and the walking type tractor centered on the traveling wheel axis is rear-low tilted. It is operated with the rotating rotary (105) penetrating into the soil to the desired depth.
As the degree of lifting of (103) increases, that is, as the cultivation depth increases, the tail wheel (103) rotates the rotary (10).
5), and the caster angle of the tail wheel tends to gradually decrease from the maximum state (a1) during operation on the road. [0004] However, if the lifting adjustment of the tail wheel (103) is performed within a certain range, there is no slight problem. However, for example, due to deep cultivation work in a tea plantation or the like, FIG.
As shown by the imaginary line, when the tail wheel (103) is greatly raised, the tail wheel (103) is remarkably close to the rotating rotary (105), and the road running posture is secured as specified. The caster angle of the tail wheel, which has been set, becomes extremely small as shown in (a2) of FIG. Therefore, in the deep tillage position, there arises a problem that foreign matter is caught between the tail wheel (103) and the rotating rotary (105) which are close to each other, or the soil removal of the cultivated soil is deteriorated, and the caster angle is extremely small. Therefore, there is a problem that the followability of the tail wheel is deteriorated and good work operation is not performed. The present invention has been made in view of the above problems, and has as its object to maintain a necessary space between a rotary rotary and a deep tilling work posture, and An object of the present invention is to provide a tail wheel mounting device for a rotary tilling machine capable of arranging a tail wheel with an appropriate caster angle so that tilling work can be performed with good workability. In order to achieve the above object, a tail wheel mounting device for a rotary tilling work machine according to the present invention is provided on a holding cylinder at a rear end portion of a work machine frame. A rotary tilling work machine configured to support a tail wheel with a caster angle attached to a lifting support device to be mounted and to raise and lower the tail wheel by a lifting support device to set a plowing depth. A front arm extending rearward from an attachment body detachably fitted to the rear arm, a rear arm attached to be vertically rotatable and fixed to the front arm, and a second holding fixed to the rear arm. An extension holder comprising a tube is provided, and the elevating support device is mounted on the second holding tube, so that the posture of the elevating support device can be changed by rotating the rear arm. It is assumed that. Since the apparatus of the present invention is constructed as described above, an extension holder is attached to the holding cylinder at the rear end of the working machine frame, and the second holder of the extension holder is held. The posture of the elevating support device can be appropriately changed by attaching the elevating support device to the cylinder and rotating the rear arm of the extension holder up and down at an arbitrary angle with respect to the front arm. Therefore,
In the case of running on the road or shallow tillage work, the front arm and the rear arm of the extension holder are held in a preset normal relative posture, and the tail wheel supported by the lifting and lowering support device is largely lowered. Thus, the rotating rotary can be maintained at a position close to or above the surface of the ground, and in that position, a proper space can be maintained between the tail wheel and the rotating rotary, and the caster angle of the tail wheel can be maintained at an appropriate level. Can be something. When the tail wheel supported by the elevating and lowering support device is raised greatly to perform deep cultivation work in a tea plantation or the like, the rear arm of the extension holder is rotated upward with respect to the front arm to be fixed. By doing so, even in this position, an appropriate space can be maintained between the tail wheel and the rotary wheel, and the caster angle of the tail wheel can be adjusted appropriately. Deep cultivation work can be performed well with good workability in a state in which the tail wheel can properly follow the tail wheel, without foreign matter being caught between them or soil removal of the cultivated soil is not deteriorated. An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a partially cutaway side view of the apparatus of the present invention, and FIG. 2 is an enlarged plan view of a main part of the apparatus of the present invention. FIG. 3 is a side view of a walking tractor in which the device of the present invention is implemented, and FIG. 4 is a side view showing a deep cultivation work mode of the walking tractor by the device of the present invention. First, the overall structure will be described with reference to FIGS. 3 and 4. The walking type tractor (T) has an engine (1) mounted in front of a transmission case, and the engine is mounted on the tractor (T).
The power of (1) is transmitted to the traveling wheel shaft (2) via the transmission mechanism in the transmission case, and the left and right traveling wheels (3) fitted on the coaxial (2) are rotationally driven to move forward and backward. It is configured to run. The operator grips the handle (4) extending from the mission case and operates the vehicle while following the walk. The operator mounts the handle on the mission case and positions the handle (4) below the handle (4). The rotary tilling machine (R)
By lifting (4) and tilting the body forward and backward about the traveling wheel axle (2) in a seesaw-like manner, the aircraft is raised and lowered to the ground. The rotary tilling work machine (R) is provided with a tilling transmission case.
(5), a working machine frame (6) extending rearward from the tilling transmission case (5), and a holding cylinder (7) provided at the rear end of the machine frame (6). It is constituted by an elevating and lowering support device (8) which is inserted and fixed in an adjustable manner. A horizontal and horizontal rotating rotary is provided at the lower end of the tilling transmission case (5).
(9) is provided, and its rotary rotary (9) is rotatably driven by power transmitted from the walking type tractor (T) via the transmission mechanism in the tilling transmission case (5). Has become. Further, the working machine frame (6) has a front end fixed to a rear upper portion of a tilling transmission case (5) and extending rearward, and a beam extending right and left from the beam. And a tilling cover extending in the form of a wing. A cultivated soil scattering prevention plate made of an elastic material such as rubber is vertically provided at the rear end of the top plate of the tilling cover. The holding cylinder (7) is integrally attached to the rear end of the beam of the working machine frame (6) at a position forward of the cultivated soil scattering prevention plate, and the holding cylinder (7) is As shown in FIG. 2, a polygonal cylinder (7a) is provided, and an extension holder (10) can be detachably fitted to the polygonal cylinder (7a). The extension holder (10) is provided with the polygonal portion (7).
a) an insertion body (11) which is inserted into a), adjusted to an arbitrary height and tightened and fixed with a fixing bolt, a front arm body (12) extending backward from the attachment body (11), and a front arm A rear arm (13) attached to the body (12) so as to be vertically rotatable and fixed, and a rear arm
(13) A second holding cylinder (14) fixed to the rear end portion, and the second holding cylinder (14) is common to the holding cylinder (7) provided on the working machine frame (6) side. It has become. The rear arm (13) is arranged along the lateral side of the front arm (12), and the front end of the rear arm (13) is connected to the mounting member by the horizontal shaft (15). A horizontal axis (15) mounted on the front arm (12) so as to be rotatable up and down on (11).
A fixing bolt (17) is inserted through the central arc-shaped long hole (16) and screwed to the rear arm (13) side so that the relative position can be changed and fixed. The elevating and lowering support device (8), which can be commonly fitted to the second holding cylinder (14) of the extension holding tool (10) and the holding cylinder (7) on the side of the working machine frame (6), comprises: (10) and holding cylinder
An outer cylinder (18) similar in shape to the polygonal portion of (7), and the outer cylinder
(18) Inner cylinder inserted vertically movably and non-rotatably
(19) and a tail wheel support shaft provided at the lower end of the inner cylinder (19) so as to be able to turn around the vertical axis center, and a tail wheel connected to the tail wheel support shaft at a caster angle (a). Tail on support arm (20)
(21) is idlely supported. The outer cylinder (18) is connected to the second holding cylinder (1).
4), slide it up and down to adjust the position to the desired height, tighten and fix it with fixing bolts provided on the second holding cylinder (14), and attach the tail wheel (21). The vertical position,
By rotating the upper rotating handle (22) to the left or right and rotating the inner cylinder (19) with respect to the outer cylinder (18), the inner cylinder (19) can be changed and adjusted by sliding. In addition,
(23) is a stopper mechanism provided between the lower end of the inner cylinder and the tail wheel support arm or the tail wheel support shaft, and is used to move the lifting / lowering support device (8) to the working machine frame (6) side. When it is mounted on the holding cylinder (7), the tail wheel is controlled to turn in the set range, and
Elevating support device on the second holding cylinder (14) of the extension holder (10)
When (8) is provided, the tail wheel can be changed to a state in which the tail wheel can be freely turned by removing the restriction. Rotary plowing machine equipped with the device of the present invention
When deep cultivation work such as a tea plantation is performed using a walking tractor (T) equipped with the (R), the holding cylinder (7) of the working machine frame (6)
The extension holding tool (10) is attached to the, and the lifting support device (8) is mounted on the second holding cylinder (14) of the extension holding tool (10). Then, the entire lifting support device (8) is raised, and the rotating handle is
With the action of raising the inner cylinder (19) by (22), the tail wheel (2)
1) is largely raised, and the rear arm (13) of the extension holder (10) is rotated upward and fixed with respect to the front arm (12). After performing the above actions, the walking type tractor
When (T) is advanced, the rotary rotary (9) of the rotary tilling work machine (R) enters the soil deeply by taking the posture shown in FIG. In this deep tilling position, a wide space is maintained between the tail wheel (21) and the rotary rotary (9), and the caster angle of the tail wheel is also maintained at an appropriate angle (a). Further, an extension holder is used for moving between fields, etc.
When traveling on the road in a posture where the lifting support device (8) is mounted on the second holding cylinder (14) of (10), the extension holding tool (1) is used.
0) The rear arm (13) is rotated downward and fixed to change the posture of the lifting / lowering support device (8). Contrary to the above, the entire lifting / lowering support device (8) descends, and When the inner cylinder (19) is lowered by the rotating handle (22) and the tail wheel (21) is largely lowered, as shown in FIG. 3, the rotating rotary (9) rises to the ground. The posture can be maintained, and the caster angle of the tail wheel becomes an appropriate angle in this posture.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view of the device of the present invention. FIG. 2 is an enlarged plan view of a main part of the device of the present invention. FIG. 3 is a side view of a walking tractor in which the device of the present invention is implemented. FIG. 4 is a side view showing a deep plowing operation mode of the walking tractor according to the device of the present invention. FIG. 5 is an explanatory diagram of a conventional device. [Description of Signs] R Rotary Tilling Work Machine 6 Work Machine Frame 7 Holding Cylinder 8 Elevating Supporting Device 10 Extension Holder 11 Mounting Body 12 Front Arm 13 Rear Arm 14 Second Holding Cylinder 21 Tail

Claims (1)

(57) [Claims] (1) A tail wheel provided with a caster angle to a lifting / lowering support device (8) mounted on a holding cylinder (7) at a rear end of a working machine frame (6).
(21), and a tail wheel (21) is lifted and lowered by a lifting support device (8) to set a plowing depth.
In a tall cultivator (R), a front arm (12) extending backward from an attachment (11) removably fitted to the holding cylinder (7).
An extension comprising a rear arm (13) attached to the front arm (12) so as to be vertically rotatable and fixed, and a second holding cylinder (14) fixed to the rear arm (13). A holding tool (10) is provided,
The lifting support device (8) is mounted on the second holding cylinder (14) so that the posture of the lifting support device (8) can be changed by the rotation of the rear arm (13). Tail wheel mounting device for rotary tilling work machines.