JPH10210815A - Engine mounting structure for paddy field work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress weight increase due to engine mounting. SOLUTION: A mission case 8 for pivotally supporting a front wheel is connected to the front part of a machine body frame in the state of projecting the input shaft 8a to one of left and right sides and the front part of a front part step connected to the machine body frame so as to be positioned on the left and right side part and front part of an engine to be loaded in the state of projecting an output shaft to one of the left and right sides and the front part of the mission case 8 are connected by a connection frame 10. A belt transmission device 33 from the output shaft to the input shaft 8a is provided, the rear side of the engine is mounted and supported to the left and right rear part attaching seats 40 of the mission case 8 and the front side of the engine is mounted and supported to a front part attaching seat 43 formed with a left and right interval L1 larger than the rear part attaching seat 40 on the connection frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an engine of a paddy working machine such as a riding type rice transplanter. The present invention relates to an engine mounting structure for a paddy field working machine which is connected to a front portion of a frame, mounts an engine with its output shaft projecting to one of right and left sides, and is provided with a belt transmission from the output shaft to the input shaft.

[0002]

2. Description of the Related Art An engine mounting structure of a riding type rice transplanter, which is an example of a paddy field working machine, is disclosed in, for example, JP-A-5-3101.
As disclosed in Japanese Patent Application Publication No. 48-48, there is known a structure in which a front frame is extended cantileverly forward from a transmission case supporting a front wheel, and an engine is mounted on the front frame.

[0003]

However, according to the above prior art, not only the engine weight acts on the cantilevered front frame, but also the drive of the belt transmission device provided between the engine and the transmission case. Tension will work and various reinforcements will be applied to increase the rigidity of the front frame, the front frame will have a heavy structure,
This contributed to the increase in the weight of the entire aircraft.

[0004] An object of the present invention is to suppress an increase in weight caused by mounting an engine.

[0005]

The features, functions and effects of the first aspect of the present invention are as follows.

[Features] A transmission case that supports the front wheels is connected to the front of the body frame with its input shaft protruding to the left or right, and the engine is mounted with its output shaft protruding to the left or right. In a paddy working machine provided with a belt transmission from the output shaft to the input shaft, a front step support frame for getting on and off located on the left and right sides and a front portion of the engine is connected to the body frame, A connection frame for connecting a front portion of the front step support frame to a front portion of the transmission case is provided, and the rear side of the engine is placed and supported on left and right rear mounting seats formed on the transmission case, and the connection frame is provided. The front side of the engine is placed and supported on a front mounting seat formed at a greater left / right distance than the rear mounting seat.

According to the first aspect of the invention, the front step support frame connected to the body frame is connected to the front portion of the transmission case via the connection frame by connecting the front portion of the front step support frame to the front portion of the transmission case. Since the strength and rigidity have been increased by reinforcement, the front steps for abutting the front part of the fuselage with the ridge or getting on and off the operating part from the ridge approached can be made strong. .

The connecting frame is provided to increase the supporting strength of the front step supporting frame. In other words, the connecting frame has high strength and high rigidity for connecting and supporting the front step supporting frame to the transmission case. Focusing on the arrangement of the connection frame and the connection frame, while the rear side of the engine is mounted and supported on the transmission case, the front side of the engine is mounted and supported on the connection frame,
The connecting frame is also used as the engine support frame, so that the engine can be reliably supported, but only a small number of dedicated components are required.

Further, in order to mount and support the engine over the transmission case and the connecting frame, the rear of the engine is mounted and supported on the left and right rear mounting seats formed on the transmission case. Paying attention to the fact that there is nothing on the left and right sides of the connecting frame, the front side of the engine is attached to the front mounting seat formed on the connecting frame with a greater left and right interval than the rear mounting seat. Since it is mounted and supported, it is possible to efficiently prevent the engine from falling down due to the belt tension of the belt transmission from the engine to the transmission case.

[Effects] Therefore, according to the first aspect of the present invention, the inherently strong connecting frame provided to enhance the strength and rigidity of the front step supporting frame is effectively used for the engine mounting frame, and the engine mounting frame is used. Not only can the weight increase be suppressed, but also the engine can be stably mounted and supported while adopting a type in which the belt transmission from the engine to the transmission case is arranged on one of the left and right sides of the engine / transmission case. Became.

According to the second aspect of the present invention, the features, functions,
The effects are as follows.

[Features] In the features of the first invention,
The rear mounting seat and the front mounting seat are for mounting and supporting the engine via a vibration isolator.

According to the second aspect of the present invention, transmission of engine vibration to a transmission case directly connected to the body frame and a connection frame connected to the body frame via the transmission case and the front step support frame. Can be suppressed by the vibration isolator, so that vibration caused by engine vibration of the body frame can be reduced.

[Effects] Therefore, according to the second aspect of the present invention, it is possible to suppress performance deterioration due to engine vibration, such as deterioration in riding comfort and deterioration in work performance due to vibration of the work equipment.

According to the third aspect of the present invention, the features, functions,
The effects are as follows.

[Features] In the features of the first and second aspects of the present invention, the load supporting surface of the rear mounting seat and the front mounting seat, which are located on the side of the input shaft protruding direction, are arranged vertically in the engine. The point is that it is of a horizontal posture in which the load is placed and supported.

[Operation] By adopting the configuration in which the engine is mounted and supported over the transmission case and the connection frame as described above, the engine is mounted in comparison with the case where the engine is mounted and supported on the front frame connected to the transmission case. , The direction in which the output shaft of the engine is pulled by the belt tension becomes closer to the vertical direction. That is, there is a strong tendency to press the engine downward due to belt tension.

Focusing on the above points, according to the third aspect of the invention, the load supporting surfaces of the rear mounting seat and the front mounting seat located on the side of the input shaft in the projecting direction are arranged in a horizontal posture, and Because it is designed to support and support the engine load,
The engine load can be efficiently supported without applying excessive shearing force to the bolts and the vibration isolator for mounting the engine on the rear mounting seat and the front mounting seat.

[Effect] Therefore, according to the third aspect of the present invention, the engine can be reliably and strongly supported.

According to the fourth aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention, the second invention, and the third invention, the front step support frame itself is a front step.

[Operation] According to the fourth aspect of the present invention, a function as a front step is provided to the front step supporting frame, so that a structure for attaching the front step to the front step supporting frame is unnecessary. is there.

[Effects] Therefore, according to the fourth aspect of the present invention, the front step relationship can be configured simply and inexpensively.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a riding type rice transplanter, which is an example of a paddy field working machine, raises and lowers a seedling planting device 3 via a link mechanism 2 at the rear of a riding type self-propelled body 1. Hydraulic cylinder 4 for freely connecting and driving up and down seedling planting device 3
Is provided.

As shown in FIGS. 2 and 3, the self-propelled body 1 has a pair of left and right rear wheels 5 attached to the front of a body frame 6 provided with an axle case 5A supporting the pair of left and right rear wheels 5 at the rear. The rear part of the transmission case 8 supporting the front wheel 7 is connected, and a front step 9 made of metal (such as iron) is connected in a forward cantilever shape, so that the front part of the front step 9 and the transmission case 8 are connected. Has a frame structure in which the front part is connected via a connection frame 10. The rear wheels 5 are drive wheels, and the front wheels 7 are steering drive wheels.

As shown in FIGS. 2 to 4, the body frame 6 has a plurality of front and rear posture frame members 6A arranged side by side and a left and right posture frame member 6B connecting their front ends.

The transmission case 8 has an input shaft 8
a is provided so as to protrude to the left and right sides, and as shown in FIG. 4, a lower transmission case portion 8A and an upper steering case portion 8B are provided, and the transmission case portion 8A and the steering case portion are provided. A hole 50 through which air flows between the transmission case portion 8A and the steering case portion 8B is formed in a boundary wall 8C with the transmission case 8B.
Is formed, and a blazer 51 is provided on an upper portion of the steering case portion 8B. That is, the inside of the transmission case portion 8A communicates with the outside air through the hole 50, the inside of the steering case portion 8B, and the blazer 51.
When the blazer 51 is installed directly on the transmission case 8A, the oil inside the transmission case 8 blows out from the blazer 51 because the steering case 8B exists between the blazer 51 and the transmission case 8A. Has been prevented.

Then, a driver's seat 11, a steering handle 12,
At the front of the operation unit having the operation step 13, the driving unit 1
4 is provided, and the engine 1 which is the main
5 is mounted over the transmission case 8 and the connecting frame 10 with the output shaft 15a protruding to one of the left and right sides, as shown in FIGS.

From the engine 15 to the transmission case 8
The transmission means can be shifted in two steps by selectively engaging and operating two belt tension clutches provided between the output shaft 15a of the engine 15 and the input shaft 8a of the transmission case 8 and having different transmission ratios. This is means for providing a sub-transmission 33 which is an example of a belt transmission, and by turning any of the belt tension clutches on, the power of the engine 15 is transmitted to the transmission case 8.
And the transmission is interrupted by disengaging both belt tension clutches.

As shown in FIGS. 2 to 5, the engine 15 is mounted on a pair of right and left rear mounting seats 40 mounted on the upper portion of the transmission case 8 via bolts. 41 is mounted and supported via a rubber-made vibration isolator 42,
The engine 1 is mounted on a pair of left and right front mounting seats 43 formed at
5 is attached to the front mounting stay 44 by using a rubber vibration isolator 4.
2, the load supporting surface 40a of the rear mounting seat 40 is formed so as to face obliquely upward and forward, and the load supporting surface 43a of the front mounting seat 43 is formed so as to face obliquely rearward and upward. And is configured to support the engine load.

As shown in FIG. 5, the horizontal distance L1 of the front mounting seat 43 is changed to the horizontal distance L2 of the rear mounting seat 40.
It is set larger than

The front step 9 includes left and right stepping steps 9A located on both left and right sides of the driving unit 14, a front step unit 9B positioned in front of the driving unit 14, and one of the operation steps 13. It has a rear step portion 9C forming a portion, and has a frame structure having strength and rigidity to support itself. That is, in this embodiment, the front step 9 itself is the front step support frame 9F for supporting it. The front step 9 is, as shown in FIG.
Are connected at the front by a front step 9B and at the rear by a rear step 9C,
That is, the engine 15 mounted on the transmission case 8
Is formed in a hollow structure in which an opening 16 for inserting a through hole is formed independently. Further, in the front step 9, one of the left and right getting on / off steps 9 A is disengaged from the engine 15 to the transmission case 8 by disengaging the clutch-engaged belt tension clutch by a depressing operation.
Pedal hole 20A through which a traveling clutch that interrupts transmission to the vehicle is inserted is formed, and a brake pedal hole 20B through which a steering brake pedal 22 acting on the rear wheel 5 is inserted is formed in the left and right stepping steps 9A. Have been.

The prime mover 14 is covered with an engine bonnet 17 made of synthetic resin disposed on the opening 16 of the front step 9. The engine bonnet 17
Is the hood main body 17A fixed to the front step 13
And a front opening / closing portion 17B attached to the hood main body 17A so as to be swingably openable and closable.

As shown in FIG. 1, a rear cover 18 made of a synthetic resin is mounted on the body frame 6, and the rear cover 18 is attached to the left and right rear wheel fenders 1
8A to the driver's seat mounting portion 18B and the rear step portion 9
An operation step section 18 that forms an operation step 13 with C
It has a structure connected by C.

Further, the riding type rice transplanter has means for regulating the steering angle. As an example, FIG.
As shown in FIG. 6, the pitman arm 6 is swingably supported by the transmission case 8 in a state in which the steering handle 12 is interlocked with a steering shaft 61 in the steering post 60 and a gear mechanism 62 in the steering case 8B.
3, the pitman arm 63 is attached to the transmission case 3, and when the pitman arm 63 swings from the straight-moving posture to the right and left by the set angle θ, the pitman arm 63 comes into contact with the hitting member 64 to further swing the pitman arm 63. Means for attaching a stopper plate 65 for preventing movement via a bolt 66 can be given. The contact member 64 is not limited to a bolt, and may be a member formed integrally with the pitman arm 63. As another example, as shown in FIG. 7, a contact member 64 is fixed to the pitman arm 63, and the contact member 64 is fixed to the transmission case 8 when the pitman arm 63 swings from the straight posture to the right and left by the set angle θ. Means for screwing and mounting a pair of left and right stopper bolts 67 that abut against each other to prevent the pitman arm 63 from further swinging can be used.

[Another Embodiment] In the above embodiment,
As shown in FIG. 8, of the rear mounting seat 40 and the front mounting seat 43, the horizontal positions in which the load supporting surfaces 40a, 43a of the ones located on the side of the projecting direction of the input shaft 8a are placed and supported in the vertical direction. Formed.

In the above embodiment, the belt transmission 33
Although the auxiliary transmission using two belt tension clutches has been described above, the belt transmission 33 may be a device that constantly transmits power, a belt continuously variable transmission, or the like.

In the above-described embodiment, the front step supporting frame 9F is formed as the front step 9. However, the front step 9 is formed separately from the front step supporting frame 9F to support the front step supporting frame 9F. It may be carried out by doing.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a cutaway plan view of the front of a riding type rice transplanter.

FIG. 3 is a cutaway side view of an engine mounting portion.

FIG. 4 is a cutaway enlarged side view of an engine mounting portion.

FIG. 5 is a plan view of an engine mounting portion.

FIG. 6 is a schematic plan view of an angle regulating structure of a pitman arm.

FIG. 7 is a schematic plan view of an angle regulating structure of a pitman arm.

FIG. 8 is a cutaway side view of an engine mounting portion showing another embodiment.

[Explanation of symbols]

 Reference Signs List 6 Body frame 7 Front wheel 8 Transmission case 8a Input shaft 9F Front step support frame 10 Connection frame 15 Engine 15a Output shaft 33 Belt transmission 40 Rear mounting seat 40a Load support surface 42 Rubber elastic body 43 Front mounting seat 43a Load support surface

Claims (4)

[Claims] 1. A transmission case supporting a front wheel is connected to a front portion of a body frame in a state where an input shaft thereof protrudes to one of left and right sides, and an engine is mounted with an output shaft thereof protruding to one of a left and right sides. In a paddy field working machine provided with a belt transmission from the output shaft to the input shaft, a front step support frame for getting on and off located on the left and right sides and a front portion of the engine is connected to the body frame, A connection frame for connecting the front part of the front step support frame is provided at the front of the transmission case, and the rear side of the engine is placed and supported on left and right rear mounting seats formed on the transmission case, and the connection frame is An engine mounting structure for a paddy working machine, wherein the front side of the engine is mounted and supported on a front mounting seat formed at a right and left interval larger than the rear mounting seat. 2. The rear mounting seat and the front mounting seat,
The engine mounting structure for a paddy field working machine according to claim 1, wherein the engine is mounted and supported via a vibration isolator. 3. The load supporting surface of the rear mounting seat and the front mounting seat, which are located on the side of the input shaft in the protruding direction,
The engine mounting structure for a paddy field working machine according to claim 1 or 2, wherein the paddle working machine has a horizontal posture in which an engine load is placed and supported in a vertical direction. 4. The engine mounting structure for a paddy working machine according to claim 1, wherein the front step support frame itself is a front step.