JP2000125621A - Transmission case setup structure in sulky rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject structure comprising setting up a transmission case and a steering shaft at respectively specific positions so as to enable the position of the center of gravity of a traveling unit to be moved forward, secure the balance of the center of gravity and safety, and, as a result, improve steering operability and planting operating efficiency. SOLUTION: In a sulky rice transplanter having such a scheme as to link a planting unit C to the rear of a travel unit B which, in turn, is mounted with an engine 2, to which a transmission case 5 is interlockingly connected, interlockingly connect front accelerator cases 6, 6, respectively to the left and right sides of the transmission case 5, and mount front wheels 7, 7 on the respective front accelerator cases 6, 6, the transmission case 5 is disposed under the engine 2 in such a manner that at least a part of the transmission case 5 is vertically superposed upon the engine 2, and a steering shaft 3 is set up behind the engine 2 and also at a position above the rear portion of the transmission case 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission case arranging structure for a rice transplanter.

[0002]

2. Description of the Related Art Conventionally, as an embodiment of a riding rice transplanter, FIG.
As shown in the figure, there is a rice transplanter main body 90 in which a planting device 93 is connected so as to be able to move up and down via an elevating link mechanism 92.The rice transplanter main body 90 has a motor unit 10 mounted on a body frame 99.
0, and a transmission case 94
The front axle cases 101 and 101 are linked and connected at the front left and right positions of the transmission case 94, respectively, and the front wheels 102 and 101 are connected to the front axle cases 101 and 101, respectively.
At the same time, transmission cases 96, 96 are linked and connected at the rear left and right positions of the transmission case 94, and rear wheels 95, 95 are attached to the rear end of each transmission case 96, 96. , 96, a horizontal frame 97 is laid horizontally, a column 98 is erected on the horizontal frame 97, and the lifting link mechanism 92 is attached to the column 98.

[0003]

However, in the above-described riding rice transplanter, the front and rear positions of the center of gravity of the transmission case 94 are located behind the front axle cases 101, 101,
In addition, since the vertical position of the center of gravity is located above the body frame 99, the center of gravity of the rice transplanter main body 90 is located near the upper center, and the front and rear of the entire riding rice transplanter with the planting device 93 connected behind. There is a problem that the balance of the center of gravity is poor.

[0004]

Therefore, according to the present invention, a planting section is connected to the rear of the traveling section, and the traveling section has an engine mounted on a front portion of a body frame, and a transmission case is mounted on the engine. A front axle case is interlocked and connected to the left and right sides of the transmission case, and the front case is attached to each front axle case. The transmission case mounting structure of a passenger rice transplanter is characterized in that a part of the transmission case is arranged so as to overlap the engine in the vertical direction, and a steering shaft is arranged at the rear position of the engine and above the rear part of the transmission case. It will not be provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, (A) is a riding rice transplanter, and a planting section (C) is provided behind a self-propelled traveling section (B). They are connected via a lifting mechanism (D).

The traveling section (B) has an upper frame (1) (1) positioned in the front-rear direction on both sides of the fuselage, protruding forward and at a high position, and an engine (2) mounted on the upper front. I have.

A steering shaft (3) is erected at a position rearward of the engine (2) and above a rear part of a transmission case (5) described later.
The steering handle (3-1) is mounted on the upper part of (3). (4) is a hood that covers the upper part of the engine (2) and fuel tank (4-1).

As described above, since the steering shaft (3) is disposed at a position rearward of the engine (2) and above a rear portion of the transmission case (5), the traveling portion (B) is moved from the steering shaft (3). ) To the front end of the steering shaft (3) as well as the running part (B) and the riding rice transplanter (A) can be made more compact. It is possible to improve the visibility in the forward and downward directions of the operator who performs the traveling operation while gripping the steering handle (3-1), thereby improving operability and safety.

At a position below the engine (2), as shown in FIG. 1, a transmission case (5) is arranged so that at least a part thereof overlaps the engine (2) in the vertical direction. ), A front axle case (6), (6), and a front axle case (6), (6) are connected to the rear left and right sides of the transmission case (5). ) To the front wheel (7) via the front axle (7-1) (7-1)
(7) Attach the rear axle case to the rear of the aircraft
Rear wheels (9) and (9) are mounted on both left and right sides of the rear axle case (8) with (8) positioned. The transmission case (5) is disposed so as to protrude downward from the upper frame (1), and the rear end of the transmission case (5) is located just below the rear end of the hood (4). ,
The front end of the front wheel (7) and the front end of the engine (2) are arranged at substantially the same position in side view.

In this manner, the front and rear positions of the center of gravity of the transmission case (5) are located forward of the front axle cases (6) and (6), and the vertical position of the center of gravity is positioned relative to the upper frame (1). It is positioned below, and the center of gravity of the entire riding rice transplanter is moved forward and downward, improving the balance and safety of the front and rear gravity centers of the riding rice transplanter, improving steering operability and planting work efficiency. I have.

In addition, by positioning the rear end of the transmission case (5) just below the rear end of the hood (4), the transmission case (5), which is a heavy object, is disposed at the front of the body. On the other hand, the planting section (C), which is also heavy, will be located at the rear of the fuselage, making it possible to improve the balance of the weight of the fuselage in the front-rear direction, thereby improving the steering operability. ing.

Reference numeral (10) denotes a lower frame located below the upper frame (1), and the upper frame (1) and the lower frame (10) constitute a body frame (F). The front end (10-1) of the lower frame (10) is connected to the front horizontal frame (10-2) which is provided in the center of the fuselage while curving inward and approaching the narrow width. .

The rear end (10-3) of the lower frame (10)
Is connected to the rear lateral frame (11) in the rear viewing portal shape.
(10-4) is a front lower frame extending forward of the lower frame (10). (12) is located in the horizontal direction of the fuselage and the left and right upper frames at the left and right vertical parts (12-1) (12-1)
This is an intermediate horizontal frame connected to the rear ends (1-1) and (1-1) of (1) and to an intermediate position in the front-rear direction of the lower frames (10) and (10).

A transmission mounting frame (10-5) is provided at a front position of the upper frame (1) in a lateral direction.
6) is an engine mounting frame provided in the front of the upper frame (1) in a lateral direction. And the same upper frame
At the left and right sides of the front of (1), the frame (1
0-7) is provided. (10-8) is a support frame for the differential lock lever, and (10-9) is a step support frame for supporting the center of the step. (13) is a rear frame provided in an inclined manner rearward and upward from both left and right positions of the front horizontal frame (10-2), and a rear end (13-1) is connected to an upper portion of the rear horizontal frame (11). Have been.

The rear axle case (8) is connected to the transmission case (5) via a propeller shaft (14) while being connected to the left and right rear portions of the lower frame (10). Reference numeral (15) denotes a rear axle projecting from both sides of the rear axle case (8), which is connected to and supported by the lower end of the rear horizontal frame (11).

(16) is a planting drive shaft for interlocking the transmission case (5) of the traveling part (B) of the rice transplanter and the planting drive case (17) of the planting part (C). And such planting drive shaft
In (16), the front drive shaft (16-1) and the rear drive shaft (16-2) are operatively connected via a universal joint (18). Also, the rear drive shaft
The (16-2) has an outer tube shaft (16-3) and an inner tube shaft (16-4) spline-fitted to make it extendable, and the inner tube shaft (16-4) is planted and driven It is linked to the case (17).

A steering case (19) is disposed above the transmission case (5) and is connected to a steering handle (3-1) via an upper steering shaft (3). (19-1) is provided.
Reference numeral (20) denotes a pitman arm shaft projecting downwardly below the steering case (19). A pitman arm (21) is connected to a lower end of the shaft toward the rear. Also, the bases of the drag rods (22) and (22) are connected to the left and right sides of the pitman arm (21), and are linked to the knuckle arms (24) and (24) of the left and right front gear boxes (23) and (23). are doing.

A steering interlocking mechanism (2) is provided by the pitman arm shaft (20), pitman arm (21), drag rods (22) (22), knuckle arms (24) (24), and the like.
5) is configured. In addition, the steering interlocking mechanism (25)
Are arranged so as to bypass from behind the mission case (5) as shown in FIG.

(26) mounting brackets projecting downward from both sides of the front of the upper frame (1), to which the transmission case (5) is fixed. (27) is a fixing bolt.

Reference numeral (28) denotes an engine pulley, which is interlocked with an input pulley (29) of the transmission case (5) by winding a V-belt (30) around it. (31) is a wide-width step-type casing body located on the upper surface of the upper frame (1), and the casing body (31) has a rear fender (3
It is made of a synthetic resin having high rigidity such as FRP so as to be integrally connected to 2) and to also serve as a floor surface, a transmission guide plate and the like.

A transmission lever (33) protrudes from an upper portion of the transmission case (5) and is located near the steering column (34). Reference numeral (35) denotes a lifting link mechanism, and a base of a pair of left and right lift arms (37) is provided on a link support bracket (36) which is obliquely bridged between a rear portion of the lower frame (10) and a rear horizontal frame (11). Is supported. (37-1) is the fulcrum axis, (3
8) is the front horizontal frame (10-2) provided on the lower frame (10)
The base (38-1) is pivotally attached to the
This is a lifting hydraulic cylinder connected to the upper support shaft (39) of (37).

Reference numeral (40) denotes a pair of left and right lift links constituting a lifting link mechanism (35). The lift link (40) has a front end connected to an upper support shaft (39) of a lift arm (37), and The end is pivotally supported on a horizontal axis (42) provided at the front of the planting frame (41). (43) is a lower link for linking the running part (B) and the planting part (C) in an interlocking manner. ), The rear end of which is attached to the front of the planting frame (41).
It is pivoted to (42).

(44) is a top link provided in a bridging manner between the rear portion of the rear frame (13) and the vertical frame (45) provided on the planting frame (41), and the top link (44) is shown in FIG. As described above, the front end is formed in a forked shape (44-1).

(46) is a mounting seat, (47) is a fulcrum pin, and (48) is a top link pin. And the above top link (44)
Further, a parallel link mechanism (49) is constituted by the lower link (43), the side-by-side lift arm (37) and the vertical frame (45).

The lifting hydraulic cylinder (38) is operated by shortening the cylinder rod (38-2) to rotate the lift arm (37) forward to raise the planted portion by the lift link (40). It works.

On the other hand, when the cylinder rod (38-2) of the lifting hydraulic cylinder (38) is extended, the planting portion is
(C) is lowered.

In FIG. 6, reference numeral (50) denotes a fixed plate provided at the base of the steering column (34).
(19) is fixed by bolts (51).

A support plate (52) for supporting the lower side of the steering case (19) is connected to the front horizontal frame (10-2) via a mounting bracket (53). (54) is a fixing bolt. Reference numeral (55) denotes a vertical frame integrally connected to the front horizontal frame (10-2), which has a mounting seat (56) for the lifting hydraulic cylinder (38) at a lower portion and a pedal shaft supporting portion (57) at an upper portion. ) Is provided.

In FIGS. 1 and 2, reference numeral (60) denotes an operation unit, and a seat (61) is provided above the casing body (31). (62) is a planting elevating lever provided on the right side of the seat (61),
(63) is a clutch pedal, (64) is a brake pedal, consisting of a left pedal (64-1) and a right pedal (64-2),
(65) is an auxiliary speed change lever.

In FIG. 8, (6) is a front axle case connected to both left and right sides of the transmission case (5), and front gear cases (6-1) are connected to the outside. (6-2) is a connecting flange of the front gear case (6-1), and has an extension (6-3) provided above.

An inverted L-shaped mounting bracket (26) and a bolt (27) are provided on the upper frame (1) to be connected downward.
It is fixed by.

Thus, the load from the front wheels (7) can be supported by the mounting bracket (26), the rigidity of the transmission case (5) and the front axle case (6) can be reduced, and It can be lightweight and compact.

Also, in the case of disassembly and maintenance, the connecting flange (6-2) is not fastened together so that disassembly is easy and no oil leakage or the like is generated from the bolt hole.

As described above, the fuselage frame (F) is configured in two stages, upper and lower, of the upper frame (1) located on the upper side and the lower frame (10) located on the lower side, and each is protruded in a pair on the right and left. Equipped with engine, lower frame lower (10)
Is shifted behind the upper frame (1) to connect the transmission case (5), and furthermore, the upper frame (1) and the lower frame (10) are connected to the horizontal frame (12).
The body frame (F) has a box-shaped structure, and its rigidity is greatly increased, so that the engine (2) and the transmission case (5) can be securely held. Things.

The body frame (F) is composed of an upper frame (1) and a lower frame (10), which are upper and lower stages, and the left and right rear frames (T) are inclined upward and rearward from the lower frame (10). 13), the rear ends of the left and right rear frames (13) are connected to a rear horizontal frame (11) formed in a rear view portal shape, and a rear horizontal frame (11) formed in the same gate shape is provided. ), The lifting link mechanism (35) is located at the inner side of the frame. And the weight of the body frame (F) can be reduced, and the lifting link mechanism (35) can be arranged in the space inside the rear horizontal frame (11) of the gate, so that the body frame (F) and the lifting link The mechanism (35) can be made compact.

Further, each part of the lifting link mechanism (35) can be protected by the rear horizontal frame (11) of the gate shape,
The lifting operation can be performed reliably.

[0037]

According to the present invention, the following effects can be obtained.

That is, according to the present invention, the transmission case is disposed at a position below the engine mounted on the front part of the body frame so that at least a part thereof overlaps the engine in the vertical direction. The position can be moved forward, and the balance and safety of the front and rear center of gravity of the riding rice transplanter connecting the planting section behind the traveling section can be secured well, and as a result, the riding rice transplanter Steering operability and planting work efficiency can be improved.

In addition, since the engine and the transmission case are arranged so as to overlap in the vertical direction, the front and rear length of the traveling portion can be shortened, and the entire riding rice transplanter can be made compact. Furthermore, since the steering shaft is located at the rear of the engine and above the rear of the transmission case, the front-rear length from the steering shaft to the front end of the traveling section can be shortened. The compactness of the whole rice transplanter can be achieved, and the visibility of the operator in the front and lower direction, which performs the traveling operation while gripping the steering handle attached to the upper end of the steering shaft, can be improved. And safety can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter equipped with the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a side view of the body frame.

FIG. 4 is a plan view of the same.

FIG. 5 is an explanatory plan view of a steering interlocking mechanism.

FIG. 6 is a side view of the same.

FIG. 7 is a rear view showing the lifting link mechanism.

FIG. 8 is a rear view showing a mounting state of a front axle case portion.

FIG. 9 is a side view showing a conventional type.

[Explanation of symbols]

 (1) Upper frame (2) Engine (5) Transmission case (7) (7) Front wheel (9) (9) Rear wheel (10) Lower frame (11) Rear horizontal frame (12) Horizontal frame (13) Rear Frame (35) Elevating link mechanism (C) Planting section (F) Airframe

Claims (1)

[Claims] 1. A planting section (C) is connected to the rear of the traveling section (B), and the traveling section (B) has an engine (2) mounted on the front of a body frame (F). The transmission case (5) is linked to the engine (2), and the front axle cases (6) and (6) are linked to the left and right sides of the transmission case (5). ) (6) front wheel
(7) In the rice transplanter equipped with (7), the transmission case (5) is arranged below the engine (2) so that at least a part of the transmission case (5) overlaps the engine (2) vertically. The transmission case behind the engine (2)
(5) The transmission case mounting structure of a rice transplanter, wherein a steering shaft (3) is provided at a rear upper position of the rear.