JPS5852865B2 - small four wheel tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has an engine installed at the front of the vehicle body and a seat provided at the rear of the vehicle. This paper relates to the improvement of small four-wheeled tractors.

Conventionally, when designing small four-wheeled tractors with a power output of about 10 to 20 horsepower, efforts were made to reduce size and weight by scaling down from large tractors and replacing cast iron parts in large tractors with sheet metal or aluminum castings. However, in the case of small four-wheeled tractors, which are scaled down from large tractors, the position of the main parts that make up the tractor does not change much, so the seat position is lower than that of larger tractors. This reduces the driver's sense of danger when riding, but on the other hand, the steering wheel and various levers and pedals cannot be made smaller, so the driver's seat becomes cramped for large drivers.

Particularly in today's world where the physique of young people has improved and the number of physiques with legs longer than the torso has increased, there has been a limit to the miniaturization of tractors simply by scaling down from large tractors.

In other words, even in a small four-wheeled tractor, the operating space is secured as much as possible, and it fully demonstrates the functions required of the tractor, such as not only traction force but also longitudinal and lateral balance of the vehicle body, operability, and setting of various work equipment. However, when designing the body of a four-wheeled tractor, the front and rear and left and right spacing of the wheels are generally set according to the output and size of the installed engine, and the size of the wheels is also set accordingly. The general outline of the tractor is determined, and when deciding on the engine position, transmission mechanism, seat and step arrangement within that framework, it is important to remember that in the case of this type of small tractor, the distance between the front and rear wheels is small. The steps became smaller, and the distance between the front and rear axles became smaller, which narrowed the space between the seat and the engine, forcing the steering wheel to overlap the driver's lap.

Therefore, in addition to scaling down as in the conventional design, it is also possible to review the arrangement of each element that makes up the tractor and make improvements to this arrangement. For example, by placing the seat as far back as possible, Attempts were made to create more space in the front, but simply moving the seats to the rear would result in tires and fenders getting in the way when getting on and off, and the steps were small, making it difficult to put both feet on one step when getting on and off. If you are unable to do so, you will be forced to get in and out of the aircraft in a very unnatural position, or the weight of the pilot sitting in the seat will be too large and will be added to the rear wheels, which will upset the weight balance in the longitudinal direction of the aircraft. There is a danger that the aircraft may easily fall backwards when traveling on a slope.

Conversely, it is also possible to move the engine part of a conventional small tractor far forward and place the seat as close to the center as possible to avoid a negative effect on the front-rear balance. The front side of the engine part rather than the front side, that is.

Since the front side of the tractor's bonnet protrudes significantly forward, there is an inconvenience that the front side of the tractor is likely to hit a ridge, stone wall, etc. and be damaged when turning.

The technical problem to be solved by the present invention is (1) to prevent the front end of the machine body from protruding more than the front wheels in a small four-wheel tractor in which the distance between the axles and the distance between the left and right wheels are narrowly limited as described above.

■ Do not install the pilot's seat in a position at the rear where it may be inconvenient for passengers to get on and off the aircraft, or where it may cause the aircraft to lose its front-to-back balance if the pilot is unscrupulous.

In addition to satisfying these constraints, we have ensured a large control space and steps to allow easy maneuvering and getting on and off despite the small body, and a stable body balance for driving on rough terrain and setting up various types of work equipment. The idea is to add some ingenuity to the arrangement of the main parts that make up the tractor.

The technical means of the present invention taken to solve the above problems are as follows:
Small-diameter front wheels for steering are placed on both sides of the front lower part of the vehicle body, large-diameter rear wheels are placed on both sides of the rear lower part, the engine is placed on the upper front part of the vehicle body, and a power transmission unit connects the engine part and the rear transmission case. In a small four-wheeled tractor with a seat on the case, the engine is placed close to the road so that the rear end of the engine and the rear end of the steering front wheels are lined up below the road, and the engine is operated close to the rear end of the engine. Install bundle equipment.

A seat provided at the rear of the control bundle device is spaced rearward from the rear end of the control bundle device so that the rear end of the control bundle device and the front end of the seat do not overlap in plan view, and
The front end of the seat and the front end of the rear wheel fender are located at approximately the same position in plan view, and the range between the axes of the front and rear wheels is such that the rear end of the seat is located forward of the upper axis of the rear wheel. a fuel tank is arranged on the rear upper surface of the vehicle body behind the seat, and a protective wall for the fuel tank is formed by rear wheel fenders extending rearward from both left and right sides of the seat and the rear surface of the seat; The steps connected to the lower ends of the front walls of the left and right rear wheel fenders have their outer edges widened to match the outer edges of the rear wheel fenders, and the upper surfaces of the steps are located below the upper surface of the transmission case. By arranging the step, the space for the control section is widened in the front and rear, left and right, and up and down directions, and the foot control device is attached to the front part of the step.

The effects obtained by taking the above technical measures are as follows.

In other words, in order to secure a sufficiently large space for the control section in front of the seat by separating the rear end of the control bundle device and the front end of the seat so that they do not overlap in plan view, it is necessary to simply move the engine section forward, Instead of moving the seats rearward, the fuel tank, which was traditionally located between the engine and the control bundle, was removed, or
Two.

The rear end surface of the engine and the rear end surface of the front wheels are arranged so that they are lined up on the road, and the control handle is positioned as far forward as possible without the engine section protruding significantly in front of the front wheels. If the front end of the seat is located at approximately the same position as the front end of the rear wheel fender in plan view, that is, if the front end of the seat is in front of the front end of the rear wheel fender, the distance between the control sections in front of the seat will be narrowed, and vice versa. If the front end of the rear wheel fender is located further back than the front end of the rear wheel fender, this will avoid inconveniences such as the fender getting in the way when getting on and off the vehicle, or the driver's weight being concentrated only on the rear wheel side, causing a loss of front-rear balance. However, as mentioned above, by aligning the edge of the seat with the front edge of the rear wheel fender, it is possible to move the seat as far to the rear of the aircraft as possible without interfering with getting on and off, front-to-back balance, etc. Therefore, the width of the control section space in the longitudinal direction can be ensured as wide as possible while satisfying the constraints (1) and (3) mentioned in the section on problems to be solved.

■ In addition, the step has a wide outer edge that matches the outer edge of the rear wheel fender, and the top surface of the step is located lower than the top surface of the transmission case, and the front edge of the step Since the foot control device is attached to the seat, the space for the control section for the legs of the pilot sitting in the seat can be secured not only in the longitudinal direction but also in the horizontal and vertical directions as well as in the vertical direction. Securing a large space in the horizontal and vertical directions in the control space where the space in the front and rear directions is limited allows the pilot's legs to be directed diagonally forward and outward while sitting in the seat. In addition, sufficient downward distance can be gained, so even in spaces where there is relatively little headroom in the front and rear directions, the legs can be placed in a comfortable position while operating the foot control device, making effective use of the three-dimensional space of the space. There is an advantage that it can be done.

■Furthermore, as mentioned above, providing the foot control on the step that is lower than the top surface of the transmission case and widened from side to side means that the foot control is provided on the transmission case at a higher position. Compared to the conventional case, when an operator sitting in a seat moves his/her legs from one step to the other, there is no inconvenience that the foot control device gets in the way, and the step itself has a sufficiently large surface area. Therefore, as mentioned above, it is easy to switch legs and get on and off with both feet on one step side, and this combined with the fact that getting on and off is not obstructed by the fender etc. mentioned above, makes it even easier to get on and off. This is a convenient configuration.

■ In order to increase the width of the control section space in the longitudinal direction, the fuel tank removed from between the engine and the control handle device is placed behind the seat between the left and right rear wheel fenders where the seats are installed. By making effective use of the extra space naturally created behind the seats, which only utilizes the space in the front half between the rear wheel fenders, it is possible to install the equipment in a position that does not interfere with other equipment without increasing the overall length of the aircraft. It has the advantage of being able to be installed with its periphery protected by a ring fender or a seat.

Embodiments of the configuration of the present invention will be described below with reference to the drawings.

The drawings show an agricultural tractor as a small four-wheeled tractor of the present invention.

Reference numerals 1 and 1 denote front wheels, which together with rear wheels 2 and 2 share and support the weight of the vehicle body, and also act as steering wheels for maneuvering.

The front wheels 1, 1 may be supported so as to freely rotate or may be driven by receiving power from a prime mover, but may also be of the type that is tilted.

Reference numeral 2.2 denotes rear wheels arranged on both sides of the rear transmission case 17 at the rear of the vehicle body, and the rotation of the engine 4 is controlled through the transmission mechanism and differential mechanism in the rear transmission case 17 connected to the rear end of the transmission case 15. It is configured to be driven by power being transmitted thereto.

In the system for driving the front wheels 1, 1, the rotational power of the engine 4 is transmitted from a transmission mechanism to a differential device located at the center of the front wheel shaft via a transmission shaft.

The front and back spacing between each wheel 1 and 2 cannot be adjusted. Generally, the distance between the left and right sides can be adjusted to some extent by changing the mounting position of the wheels relative to the axle.

The engine 4 is arranged close to the engine so that its rear end surface 4' is aligned with the rear ends of the front wheels 1, 1 below the road.

The transmission case 15 is connected to the lower part of the rear end surface 4' to form a frameless vehicle body.

Reference numeral 5 denotes a radiator of the engine 4, which is disposed on the front side of the engine 4 and covered by the bonnet 3.

Reference numeral 12 denotes a control handle device, which is fixed to the upper end of a rotatable steering shaft protruding from a steering gear box fixed to the front upper surface of the transmission case 15 close to the rear end surface 4' of the engine.

Reference numeral 6 denotes a seat, whose front end is positioned so as to substantially coincide with the front ends of the rear wheel fenders 8, 8, and whose rear end is the axle 2a of the rear wheels 2, 2.

It is arranged so as to be located above and in front of the axis of 2a.

And, between the front end of the seat 6 and the control bundle device 12,
As mentioned above, since the front end of the seat is positioned and the control bundle device 12 is placed toward the front, a large space is created, and it is located approximately in the middle of the front and rear wheels 1°2, on the side facing away from the step 10 on the boarding and alighting side. There is no need to make unnatural movements such as stepping over the upper side of the steering bundle when moving one foot to the other.

Reference numeral 7 denotes a fuel tank, which is connected to the intake port of the fuel pump of the engine 4 through a thin pipe (not shown).

This fuel tank 7 is arranged at a corner formed by the rear upper surface of the vehicle body and the rear surface of the seat, and rear wheel fenders 8, 8 are arranged on both left and right sides thereof, respectively.

The upper surfaces of the rear wheel fenders 8, 8 are located at a higher position than the upper surface of the fuel tank 7 and extend substantially horizontally to prevent objects from hitting the fuel tank I from the sides.

Further, the upper front portions of the rear wheel fenders 8, 8 extend horizontally to the side of the seat 6 so as to move away from the outer periphery of the rear wheel 2.2, and near the front end thereof, a protruding armrest is provided close to the seat 6. The section 11 is provided.

The front surfaces of the rear wheel fenders 8, 8 are provided with inclined front plate parts 8a, 8a up to the step 10, and the lower end thereof is provided with the step 1.
Connected to the rear end of 0.

The step 10 is located at a lower position than the upper surface of the transmission case 15 and protrudes laterally from both side surfaces of the transmission case 15 so as to close the space between the front and rear wheels 1 and 2.

Further, the outer edge of the step 10 is configured to be wide enough to almost match the outer edge of the rear wheel fender 8.

Further, a front plate 13a and a side plate 13b are connected to the front part of the step 10, and the upper end of the front plate 13a is connected to a substantially horizontal upper plate 13c, thereby forming a foot cover 13.13. As in the past, foot operation tools such as a general latch pedal 14 and brake pedals 16, 16 for left and right rear wheels are provided.

[Brief explanation of drawings]

The drawings show an embodiment of a small four-wheeled tractor according to the present invention,
FIG. 1 is an overall side view, and FIG. 2 is an overall plan view. 1...Front wheel, 2...Rear wheel, 4...
...Engine, 4'... Engine rear end surface,
6...Seat, 1...Fuel tank, 8.
...Rear wheel fender, 10...Steps,
12... Maneuvering bundle device, 15...
transmission case.

Claims (1)

[Claims] 1 Small-diameter front steering wheels 1°1 are arranged on both sides of the front lower part of the vehicle body, large-diameter rear wheels 2°2 are arranged on both sides of the rear lower part,
In a small four-wheel tractor, an engine 4 is mounted on the upper front part of the vehicle body, and a seat 6 is provided on a transmission case 15 that connects the engine 4 and a rear transmission case 11. The engine 4 is arranged close to the engine so that the rear ends of 1 and 1 are lined up below the road, and the steering handle device 12 is arranged close to the engine rear end surface 4', and the steering handle device 12 is provided behind the steering handle device 12. The seat 6 is spaced rearward from the rear end of the control handle device 12 so that the rear end of the control handle device 12 and the front end of the seat do not overlap in plan view, and the front end of the seat and the front end of the rear wheel fenders 8, 8 are located at approximately the same position in plan view, and between the axes of the front and rear wheels 1, 1, 2, 2 so that the rear end of the seat 6 is located forward from above the axis of the rear wheels 2, 2. The fuel tank 7 is located within the range and is located behind the seat on the upper surface of the rear part of the vehicle body, and the fuel tank 1 is connected to the rear wheel fenders 8, 8 extending rearward from both left and right sides of the seat 6 and the rear surface of the seat.
The step 10.10 forming a protective wall and connected to the lower ends of the front walls of the left and right rear wheel fenders 8, 8 has its outer edge widened so as to match the outer edge of the rear wheel fender 8. At the same time, the upper surface of step 10.10 is arranged so as to be located below the upper surface of the transmission case 15, and the control section space is configured to be wide in the front and rear, left and right, and up and down directions. A small four-wheeled tractor equipped with foot controls 14°16.