JPH0225839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a riding working machine such as an agricultural tractor, and particularly to an arrangement structure of a steering device and a power take-off section of an engine.

(Prior art) In the case of riding working machines such as agricultural tractors that have wheels on both the front and rear sides of the vehicle body, the engine is mounted vertically at the rear of the vehicle body, and the driving wheels are formed at the rear from the vertically installed crankshaft. Connect the propulsion shaft to the left and right rear wheels,
Generally, a passenger seat is placed in the widthwise center of the rear part of the vehicle body, and a steering gear box is placed at the widthwise center of the vehicle body behind the lower part of the engine.

(Problem to be solved by the invention) In such a riding work machine, it is conceivable to tilt the engine cylinder to one side in order to lower the bonnet and widen the front field of view, but it is possible to tilt the engine cylinder to one side. If the cylinders are tilted while aligned at the center in the width direction, the tilted cylinders will protrude to one side of the left and right front wheels that form the steering wheels, making it impossible to achieve a large front wheel steering angle. It deviates from the center to the side,
It is also unfavorable in terms of weight balance.

Furthermore, if the crankshaft and steering gearbox are both located at the center of the vehicle body in the width direction, they must be spaced apart vertically to avoid interference between the gearbox and the propulsion shaft. The height becomes high and becomes a large protrusion from the vehicle floor.

The purpose of the present invention is to lower the bonnet to widen the forward field of view, and also to improve the left-right balance of front wheel swing steering by devising the arrangement of the engine output shaft. The corners can be made larger, the weight balance is better, and interference between the steering gear box and the propulsion shaft has been eliminated, and the protrusion from the vehicle floor has been made smaller, allowing for more space around the occupants' legs. The object of the present invention is to provide a riding working machine that achieves improved operability.

(Means for solving the problem) Therefore, the present invention tilts the cylinder 12 of the engine 10 vertically mounted at the front of the vehicle body to one side, and aligns the engine output shaft 11 to the center in the width direction of the vehicle body. The engine output shaft 1 is arranged at an offset d to the side opposite to the inclined cylinder 12, and the engine output shaft 1 is located above the steering gear box 20, which is arranged in the widthwise center of the vehicle body at the rear of the lower part of the engine 10.
1, and a propulsion shaft 15 connected rearward from the output shaft 11 is disposed on the gearbox 20 on the side of a steering post 21 which is raised at the center in the width direction of the vehicle body.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a cutaway side view of a riding work machine 1, in which an engine 10 with a vertical crankshaft 11 is mounted on the front part of a frame 2, the engine 10 is covered with a bonnet 3, and a rear part of the frame 2 is equipped with a power plant. The transmission case 16 is arranged, the transmission input shaft 17 and the crankshaft 11 are connected by a propulsion shaft 15, the propulsion shaft 15 passes below the floor part 4, and the passenger seat 5 is mounted at the widthwise center on the rear part of the vehicle body. Front wheels 6, 6 are provided on both sides of the engine 10, and rear wheels 7, 7 are provided on both sides of the transmission case 16, respectively. A steering gear box 20 is arranged at the center of the width direction of the vehicle body at the rear of the lower part of the engine 10.
Attach the steering post 2 at the center of the width of the vehicle on
1, and a steering shaft 22 inserted through the post 21 is provided with a handle 23 at the upper end thereof, and in this embodiment, such a work vehicle can perform front and rear wheel steering by operating the handle 23, and is capable of four-wheel drive. It is.

That is, the transmission output shaft 18 and the differential input shaft 28 of the differential case 27 disposed below the engine 10 at the front of the vehicle body are connected by a propulsion shaft 29, and a link mechanism 30 is installed extending from below the steering gear box 20 in the longitudinal direction of the vehicle body. do.

In the above, as shown in FIGS. 2 and 3, the cylinder 12 of the engine 10 is formed to be inclined at an angle θ toward one side, that is, in the direction of the front wheels 6 on the left side of the vehicle body, and the center line C in the width direction of the vehicle body On the other hand, the crankshaft 11 is offset d to the right side of the vehicle body, and the crankcase 13 is placed on the frame 2. The crankshaft 11 is disposed above the steering gear box 20 as shown in FIG.

Further, the transmission input shaft 17 is similarly arranged with an offset d to the right from the vehicle body center line C, and the propulsion shaft 15 connecting the transmission input shaft 17 and the crankshaft 11 is arranged on the right side of the steering post 21.

In the embodiment, the transmission output shaft 18 and the differential input shaft 28 are disposed below the link mechanism 30, and are disposed substantially coincident with the vehicle body center line C, and are interlocked and connected by a propulsion shaft 29.

Next, the steering system will be described based on FIG.

A pinion 24 provided at the lower end of the steering shaft 22 facing into the steering gear box 20 meshes with the sector gear 25, and a bell crank 31 is fixed at a corner to the lower end of the sector shaft 26 projecting below the gear box 20, and one end of the bell crank 31 Left and right front wheel tie rods 32, 32 are connected to one end, and a linkage link 33 is connected to the other end.

Further, a bell crank 34 is disposed in front of the transmission case 16 and below the input shaft 17, and a support shaft 35 at a corner of the bell crank 34 is aligned with the vehicle body center line C, and the linkage link 33 is attached to one end. A linkage link 33 is arranged to intersect the vehicle body center line C, and rear wheel tie rods 36 are connected to both ends of the bell crank 34.

Since the cylinder 12 of the engine 10 is tilted to one side in this manner, the overall height of the engine 10 is reduced, and the bonnet 3 can therefore be formed low, making it possible to widen the forward field of vision.

and the crankshaft 1 of such inclined engine 10
Since the engine 10 is mounted with the engine 10 offset d from the vehicle body center line C on the opposite side of the cylinder 12, the center of the width W of the tilted engine 10 almost coincides with the vehicle body center line C, and on the other hand, the engine 10 is moved toward the front wheels. Since the engine does not protrude, the left and right balance of the rocking steering of both front wheels 6, 6 is good,
The steering angle can be set sufficiently large. Furthermore, since the center of gravity of the tilting engine 10 substantially coincides with the center in the width direction, it is favorable in terms of weight balance.

Since the propulsion shaft 15 is arranged on one side of the steering post 21 which is placed upright on the steering gear box 20 in alignment with the vehicle body center line C, interference between the gear box and the propulsion shaft can be prevented, and this part can be made compact. Therefore, the protruding part from the floor part 4 can be minimized to provide a wide space around the occupant's legs.

As described above, the operability of the riding work machine can be improved.

In the embodiment, the riding working machine is capable of front and rear wheel steering and four-wheel drive, but the present invention is effective in riding working machines in which at least the front wheels form steering wheels and the rear wheels form driving wheels. It is.

(Effects of the Invention) As described above, according to the riding machine of the present invention, the cylinder of the front vertical engine is tilted to one side, and its output shaft is set to the opposite side of the tilted cylinder with respect to the center in the vehicle body direction. Place it offset to
Furthermore, the engine output shaft was placed above the steering gear box at the rear center of the bottom of the engine, and the propulsion shaft was placed on the side of the steering post.
Not only can you widen the front field of view, but you can also improve the left-right balance of the swing steering of the front wheels, allowing you to increase the front wheel steering angle.At the same time, you can improve the weight balance, and at the same time improve the steering gear box. Interference between the engine and the propulsion shaft is also eliminated, and the space around the occupant's legs can be increased, improving driving operability.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view of the riding work machine, FIG. 2 is a front view of the engine and its surroundings, and FIG. 3 is a plan view of the drive system and steering system. In addition, in the drawing, 1 is a riding working machine, 2 is a frame, and 4 is a riding work machine.
is the floor part, 5 is the passenger seat, 6 and 7 are the wheels,
10 is the engine, 11 is the engine output shaft, 12 is the tilt cylinder, 15 is the propulsion shaft, 16 is the transmission case, 17 is the transmission input shaft, 20 is the steering gear box, 21 is the steering post, 23 is the handle, and C is the vehicle body. This is the center line.

Claims (1)

[Claims] 1. In a riding work machine in which an engine is mounted vertically in the front of the vehicle body, and a steering gear box is arranged at the center of the width direction of the vehicle body behind the lower part of the engine,
The engine is mounted with the cylinder tilted to one side and the output shaft offset to the opposite side of the tilted cylinder with respect to the widthwise center of the vehicle body, and the output shaft is placed above the steering gear box to generate the output. A riding working machine characterized in that a propulsion shaft connected to the rear from the shaft is disposed on the steering gear box on the side of a steering post that is set up in the center of the width direction of the vehicle body.