JP2000166328A - Transmission case arranging structure in sulky rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the longitudinal balance of the center of gravity in a sulky rice transplanter. SOLUTION: In this sulky rice transplanter, a transmission case 5 is arranged below an engine 2 and a fuel tank is arranged at a position upper the engine 2, then the engine 2 and the fuel tank are covered with a hood, thus a front wall of the hood is forwardly lowering inclined in a side view and forwardly swelling out about a quarter circular arc, then a steering handle is arranged at a position over the hood, and the steering handle is arranged so as an upper end of a seat back part of the seat and a height from the ground to be the same.

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. The front axle cases are linked to the left and right sides of the transmission case, and the front axle cases are equipped with front wheels. A fuel tank is arranged above the engine, and the engine and the fuel tank are covered with a bonnet. The front wall of the bonnet is inclined forward and downward in a side view and swells forward. The steering handle is located above the bonnet, and the steering handle is There is provided cents transmission case arrangement structure of riding rice transplanter, wherein the backrest portion of the top and ground clearance is arranged to be substantially the same.

[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. The transmission case (5) is located below the engine (2).
The fuel tank (4-1) is located above the engine (2).

In this way, the position of the center of gravity of the running portion (B) can be moved forward, and the planting portion (C), which is a heavy object, is connected to the rear of the running portion (B). Riding rice transplanter (A)
The center of gravity of the front and rear and the safety can be satisfactorily secured, and as a result, the steering operability and planting work efficiency of the rice transplanter (A) can be improved.

The engine (2) and the fuel tank (4-1) are covered with a bonnet (4), and the front wall of the bonnet (4) is inclined downward and forward in a downward direction in a side view. It is shaped as a roughly quarter-circular arc.

In this manner, the visibility of the operator in the forward and downward direction can be improved, and the operability and safety can be improved.

A steering shaft (3) is located at a position rearward of the engine (2) and above a rear portion of the transmission case (5).
The steering handle (3-1) is attached to the upper end of the steering shaft (3).

In this way, the steering shaft
The front-rear length from (3) to the front end of the traveling section (B) can be shortened, and the traveling section (B) and the riding rice transplanter (A) can be made more compact, and the steering shaft (3) The steering handle (3
-1) It is possible to improve the visibility in the forward and downward directions of the operator who performs the traveling operation while holding the, so that the operability and the safety can be improved.

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 transmission case (5) is located just below the rear end of the hood (4).
(5) Position the rear end, and then, from the side view, the front wheels (7)
And the front end of the engine (2) are arranged at substantially the same position.

The steering handle (3-1) described above is arranged above the hood (4).
The steering handle (3-1) is arranged such that the height of the ground is substantially the same as the upper end of the backrest (61b) of the seat (61) arranged behind.

In this way, the ground clearance of the airframe is set to the seat (61).
The height can be set as low as possible with respect to the upper end of the backrest (61b), so that the running stability of the fuselage can be improved and the body can be made compact.

Moreover, the engine (2) is located at the seat of the seat (61).
It is arranged at a position lower than the upper surface of (61a).

In this manner, the forward visibility and the operability of the operator sitting on the seat (61) can be improved, and the height of the relatively heavy engine (2) above the ground can be reduced. It is possible to ensure good balance of front and rear center of gravity and safety of the riding rice transplanter. As a result, it is possible to improve the steering operability and the planting operation efficiency of the riding rice transplanter.

Further, the front end of the transmission case (5) is located directly below the engine (2), and a virtual tangent to the front wheel (7) connecting the front end of the fuselage and the front side of the front wheel (7).
The front end of the transmission case (5) is located at a position rearward of (L), and the rear end of the transmission case (5) is located immediately below the rear end of the hood (4). Here, a so-called nose angle (θ) is formed by the virtual tangent (L) and the running surface (G).

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 located 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.

Moreover, since the front end of the transmission case (5) is located directly below the engine (2), the engine (2) and the transmission case (5) are arranged in an overlapping manner in a side view, and As a result, the overall length of the rice transplanter (A) can be reduced in size and weight.

Further, since the rear end of the transmission case (5) is located immediately 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 a heavy object, is located at the rear of the aircraft, making it possible to improve the balance of the aircraft weight in the front-rear direction, which also improves steering operability. Can be done.

Further, since the front end of the transmission case (5) is located behind the virtual tangent (L) of the front wheel (7) connecting the front end of the fuselage and the front side of the front wheel (7), Mission case (5) when crossing steps such as ridges
No collision occurs, and damage to the transmission case (5) can be prevented.

In addition, the rear end of the transmission case (5) is located at a position immediately below the rear end of the hood (4), and a transmission lever (33) described later as an operation lever interlocked with the transmission case (5). The gearshift lever (33) is placed in a position immediately behind the hood (4), so that the operability of the transmission lever (33) is good.

A lower frame (10) is located below the upper frame (1). The lower frame (10) constitutes a body frame (F) by the upper frame (1) and the lower frame (10). 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 laterally at the front position of the upper frame (1).
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).

Numeral (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 has a steering handle (3-1) interlockingly connected 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.

The 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, and a V-belt (30) is wound around and interlocked with an input pulley (29) of the transmission case (5). (31) is a wide-width step-and-step casing body located on the upper surface of the upper frame (1), and the casing body (31) has a rear fender (32) at the rear.
It is made of a synthetic resin having high rigidity such as FRP so as to be used as a floor, a speed change guide plate, etc.

Reference numeral (33) denotes a shift lever protruding above the transmission case (5), which 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 a rear end. 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). 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, by extending the cylinder rod (38-2) of the lifting hydraulic cylinder (38), 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.

Also, in FIGS. 1 and 2, reference numeral (60) denotes an operating section, and the operating section (60) is provided with a seat (61) above the casing body (31). Planting elevating lever on right side
On the other hand, a clutch pedal (63) as an operation pedal is provided on each of the left and right sides of the bonnet (4).
And the brake pedal (64)
(64) is composed of a left pedal (64-1) and a right pedal (64-2). (65) is a sub speed change lever.

As described above, since the clutch pedal (63) and the brake pedal (64) as operation pedals are disposed at the left and right sides of the hood (4), the driving unit is located at the rear position of the hood (4). (60) can be placed close to the bonnet (4), and the front and rear width of the traveling section (B) is reduced while maintaining good operability of the pedals (63) and (64). The body can be made compact.

In FIG. 8, (6) is a front axle case connected to the 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.

Then, a mounting bracket (26) having a reverse L-shaped cross section and a bolt (27) are provided to be connected to the upper frame (1) downward.
It is fixed by.

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

In connection with 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 holes.

As described above, the fuselage frame (F) is constructed 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 from the left and right pairs. 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) in two 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 position, which increases the rigidity of the fuselage frame (F) and supports the axle load with a wide span by the portal-shaped rear horizontal frame (35). 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.

[0050]

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

That is, in the present invention, while the transmission case is arranged below the engine and the fuel tank is arranged above the engine, the center of gravity of the traveling part can be moved forward. , Good balance of front-rear center-of-gravity balance and safety of the riding rice transplanter connecting the planting part which is a heavy object behind the traveling part,
As a result, it is possible to improve the steering operability and the planting operation efficiency of the riding rice transplanter.

In addition, the engine and the fuel tank are covered with a bonnet, and the front wall of the bonnet is not inclined downward and forward in a side view and has a substantially quarter-arc shape which swells forward. Therefore, the visibility of the operator in the lower front direction can be improved, and the operability and safety can be improved.

Further, the steering handle is arranged at a position above the hood, and the steering handle is arranged so that the height of the ground is substantially the same as the upper end of the backrest of the seat. The height can be set as low as possible with respect to the upper end of the seat back, so that the running stability of the aircraft can be improved and the aircraft can be made more compact.

[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 part (F) Aircraft frame (G) Running surface (L) Virtual tangent

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 placed below the engine (2), and the fuel tank (4-1) is placed above the engine (2). do it,
Connect the engine (2) and fuel tank (4-1) to the bonnet
(4), and the front wall of the bonnet (4) has a substantially quarter-arc shape that is inclined downward and downward and swells forward in a side view. The steering handle (3-1) is located at the upper position, and the steering handle (3-1) is attached to the back (6) of the seat (61).
1b) The transmission case installation structure of a rice transplanter, wherein the upper end of the transmission case and the height above the ground are substantially the same.