JPH0322122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a riding lawn mower that allows a rider to mow the lawn while riding on the lawn mower.

(Prior technology) A riding lawn mower that is equipped with a cutter at the bottom of the vehicle body, uses engine power to drive the cutter to mow the lawn, and is driven by wheels to move, and is mounted and operated by a passenger has come into practical use. It is provided.

(Problems to be Solved by the Invention) It is preferable that such a riding lawn mower has a simplified configuration, a compact external shape, and an excellent weight balance.In order to achieve compactness, it is desirable to shorten the front and rear lengths. We also want to keep the crew's boarding posture low. I also want to keep the vehicle width as small as possible,
On the other hand, it is desirable to arrange fuel tanks and fuel supply devices such as carburetors in a rational and functional manner while achieving the above.On the other hand, the same goes for the exhaust system, and the fuel system is It is not functionally desirable if it is affected by heat.

The present invention has been made in view of the above.

(Objective of the Invention) The object of the present invention is to reduce the length of the vehicle body in the longitudinal direction as short as possible, improve the weight balance, and secure the functionality of the exhaust system and fuel system while maintaining space. be arranged rationally while making effective use of
To provide a riding lawn mower which is made compact in the width direction by suppressing an increase in vehicle width, and is improved in practicality and ease of use by making it easier to operate.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems and also achieve the above-mentioned objects, the present invention provides a seat approximately in the center of the vehicle body in the front-rear direction, and an engine mounted below the seat. The fuel system is placed on one side of the engine in the vehicle width direction.
An exhaust system was installed on the other side.

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

Figure 1 is an explanatory side view with main parts broken away, Figure 2
The figure is an explanatory plan view.

The frame 2 of the riding lawn mower 1 includes two left and right main frame members 201, 201 extending in the front and back direction.
with cross members 20 at the front and rear ends.
3,204, and the intermediate cross member has been omitted for reasons of other parts. A cover 3 forming the exterior of the vehicle body is provided to cover the sides and top of the frame 2, and the cover 3 includes an upright front cover 301 at the front, an intermediate cover 303 forming a seat cover and an engine cover at the middle in the longitudinal direction. , a floor section 302 connecting the lower end of this and the lower end of the front cover 301, a rear cover 304 extending rearward from the intermediate cover 303, and the like. frame 2
A seat post member 205 is provided upwardly in the middle between the left and right members 201 and 202, and the member on one side is omitted in FIG. 2 for convenience of explanation.

At the front and rear of the frame 2, there are front wheels 4, 4, which form two running wheels on the left and right, and rear wheels 5, which form driving wheels.
5 is provided, the front wheels 4, 4 have a small diameter, and the rear wheels 5, 5 have a small diameter.
has a large diameter. Wheels 4, 4 are front covers 30
1. A round handle 60 that rotates a handle shaft 602 in a handle column 601 vertically installed in the handle column 601.
3, it travels left and right and performs steering, thereby forming a travel mechanism 6.

An engine 7 is disposed approximately in the center of the frame 2 in the longitudinal direction and in the vehicle width direction, the periphery and upper part of the engine are covered with a cover 303, and the seat 30 is disposed above the engine 7. ing. In the embodiment, the engine 7 is a vertical engine with a vertical crankshaft, and its output shaft 701 is suspended from the engine 7.

Between the rear wheels 5, 5 and above the rear axle 5
A transmission case 8 constituting a transmission is disposed at the upper rear of the vehicle 01, and a reduction case 9 is provided below the transmission case 8, and a rear wheel 501 is installed across the transmission case 8. The input shaft 11 extends downward from the transmission case 8.
The input shaft 11 is located at the rear of the rear wheel 501 and is arranged to hang down in a direction perpendicular to the shaft 501, and an upper pulley 1 is provided at the middle part of the input shaft 11.
Fixed 0. A drive bevel gear 111 is provided at the upper end of the input shaft 11, and a driven bevel gear 801 that meshes with the drive bevel gear 111 is provided in the transmission case 8, thereby transmitting the input to the input shaft 11 to the transmission mechanism, and transmitting the input to the input shaft 11 to the transmission mechanism. The rear wheels 501 are driven via a transmission mechanism (not shown). In the upper transmission device 8, the rear ends of the frame members 201 and 202 substantially coincide with each other, no component equipment protrudes rearward from the rear ends of the members 201 and 202, and stays 29 and 29, which will be described later, are provided at the rear ends. only.

A drive pulley 12 is fixedly installed at the lower part of the output shaft 701 of the engine 7, which is disposed at the same level as the upper pulley 10 of the transmission case 8, and between the pulleys 12 and 11 is a belt. 13
The tension roller 14 presses the middle part of the belt 13. As described above, the output of the engine 7 is input to the transmission, which drives the latter wheels 5, 5, and drives the cutter as described later.

A lower pulley 15 for driving the cutter is fixed to the lower end of the input shaft 11, and a cutter deck 16 serving as a housing for the cutter is provided below the middle in the longitudinal direction of the vehicle body. The katatsu deck 16 has a cover shape that is open downward, and has a circular shape with a large diameter in plan view as shown in FIG. It is approximately the same as between the sides, and the outer end 163 in the vehicle width direction is located between the rear wheels 5 and 5.
The outer end 1 is approximately at the same level as the outer surface 502 of the
63 should not protrude from the outer surface, or even if it should protrude, it should be minimal. A discharge duct 16 is provided on the opposite side of one outer end 163 of the snail deck 16.
4, and the duct 164 is on the right side in the embodiment,
The front wall 165 of the duct 164 is opened outward (right outward) at approximately the center in the longitudinal direction of the vehicle body, and the front wall 165 of the duct 164 is inclined outward in the rearward direction. The mown grass is discharged backward and outward from the front wall. An edge 166 forming the opening of the duct 164 is linear in the front-rear direction, and faces approximately at the same level as the outer surface 503 of the rear wheel 5 on this side, or more inward than this. Small-diameter guide wheels 168, 168 are attached to the front left and right sides of the peripheral wall 162 via brackets 167, 167.

A cutter 17 is disposed inside the cutter deck 16, and the upper part of the drive shaft 171 of the cutter 17 is inserted into the cutter deck 16.
It protrudes upward through a holder 172 that extends vertically upward, and a pulley 18 is fixedly installed at the upper end thereof, and the pulley 18 is connected to the lower pulley 15 of the input shaft 11 described above via a belt 19. .

As a result, the cutter 17 is rotationally driven by the engine output via the pulleys 15, 18, and the drive wheels 5, 5
Therefore, mowing work will be carried out along with transportation. The rotational drive of the input shaft 11 by the pulley 12, head 13, and pulley 10 is directly transmitted to the cutter 17 by the pulley 15. In the cutter pulley 18, the cutter deck 16 is located at the center in the front-rear direction of the vehicle, forward of the output shaft 701, and the pulley 15 is located behind the rear wheel 501, so the span between the pulleys 15 and 18 is long. Therefore, when the height of the cutter 17 is adjusted up and down to adjust the mowing height, the deck 16
At the same time, the height of pulley 18 also increases and decreases, while the height of pulley 15 does not change, but pulleys 15 and 18
Since the span of the belt 19 is long, the change in angle of the belt 19 is as small as possible, and it is possible to prevent the belt from coming off, causing uncertain power transmission, and uneven wear of the belt. In addition, the reliability of power transmission is guaranteed even when the pulley 18 moves up and down, and the life and durability of the belt are also improved.

By the way, referring to the vertical adjustment mechanism of the snail deck 16, a bracket 211 provided at the front of the deck 16 is connected to a bracket 20 which is suspended from the front end of the frame 2 via a joint 212 and a link 213.
6 to support. On the other hand, a bracket 214 is installed on the rear of the deck 16, and this is attached to the link 21.
5. It is connected to the guide stopper mechanism 216 and a lever 217 provided on one side, and the deck 16 is moved up and down by operating the lever 217.

A fuel supply device 22 is provided at the front below the seat 30 on one side of the engine 7, for example on the left side, and the supply device 22 includes a supply section 221 including a carburetor and an air cleaner 222 disposed above the fuel supply section 221. , Throttle lever 2 that adjusts the engine rotation machine outward.
23, pinch and rotate the lever 223,
Perform throttle adjustment. A fuel tank 23 serving as a fuel storage device is arranged behind the supply device 22 on one side of the engine 7, and the tank 23 extends from an intermediate portion of this side of the engine 7 to the rear and further rearward. Since the supply device 22 and the fuel tank 23, which form the fuel supply system, are provided on one side of the engine 7 in the longitudinal direction, the space on one side of the engine can be used without waste, and the vehicle width can be kept small. Because they are arranged at the front and back, the fuel supply piping can be extremely short, making fuel supply smoother and piping much simpler. Further, since the fuel supply device 22 is provided on the opposite side of the deck 16 to the discharge duct 164, it is protected from the influence of grass and dust accompanying discharge.

The exhaust pipe 24 is located on the other side of the engine 7, on the right side in the figure.
The pipe body 241 extends rearwardly and outwardly from the front part of this side of the engine 7, extends to the middle part of the outer side of the engine 7, and connects the rear end to the muffler 25. The muffler 25 is disposed extending from the outer middle part to the rear part of the engine 7 on this side.
A clearance exists between the engine 7 and the corresponding side surface of the engine 7. A duct 26 is provided to surround the exhaust pipe 24 and muffler 25, and cooling air from a fan (not shown) attached to the engine 7 is flowed through the duct 26, cooling the exhaust pipe 24 and muffler 25, and connecting the exhaust pipe with the outside through the duct 26. Therefore, even if the exhaust system is located below the seat 30, below the passenger's waist, and behind the legs, heat insulation is ensured. Since the exhaust system was installed on one side of the engine 7 and separated from the fuel supply system, the fuel supply system could be thermally protected.Also, since the exhaust system was installed on one side of the engine, it was advantageous in terms of space utilization. The width of the vehicle can be reduced because the exhaust pipe 24 is extended to the rear side, and the pipe length is secured, and the power transmission device including the transmission and the battery 27 installed at the rear of the engine (to be described later) can be installed at the rear. without interfering with equipment,
The space behind the engine can be utilized advantageously, and as a result, the length of the vehicle body in the longitudinal direction can be shortened, and the vehicle width can be suppressed and the vehicle can be made more compact.

By the way, the battery 27 is provided in a space behind the engine 7 and in front of the transmission case 8, and the space between them is used effectively.

The aforementioned cutter adjustment lever 27 is provided on the left side, and the throttle lever 223 is provided on this side, but the change lever 28 is provided on the opposite side, and in the embodiment, the muffler is placed on the outside of the engine 7 at the rear of this side. A shift pattern plate 281 is provided above the shift pattern plate 25, and the shift lever 283 of the transmission case 8 is swung back and forth by the rod 282 which is positioned and operated by the shift pattern plate 281 to change the speed.The above constitutes a speed change operation system.

Also, may frame members 201, 20 of the frame
At the rear end of 2, there are stays 29, 29 spaced apart on the left and right.
This allows it to be stored in an upright position with the rear end facing down, and the lower end 2 of the stays 29, 29
91 is placed above the ground contact surface of the rear wheel 5, and when working with the front upward tilt, the lower end portion 291 is installed to prevent further inclination from the front upward tilt. And stay 29,2
9 also functions as a rear bumper.

(Effects of the Invention) As is clear from the above, according to the present invention, first, the engine is provided below the seat at approximately the center in the longitudinal direction of the vehicle body, and the fuel system, such as the fuel supply device and the fuel tank, is provided on either the left or right side of the engine. Since the exhaust system consisting of the exhaust pipe and muffler is placed on the other side separated by the engine, the fuel system is insulated from the heat of the exhaust system, and the fuel system is protected from the heat influence of the exhaust system. This function can be ensured to ensure smooth fuel supply.

Next, the space in the vehicle width direction of the engine can be used more effectively, and the fuel system and exhaust system can be stored and arranged on both sides of the engine, realizing a rational arrangement. By utilizing the dead space on both sides, the fuel system and exhaust system can be housed in a compact size, keeping the vehicle width as small as possible, and making the exterior of the riding lawnmower more compact.

In addition, since the fuel supply device and fuel tank are placed on one side of the engine in the vehicle width direction, they can be placed in the front and rear. By being able to suppress the increase, and by arranging the fuel pipes adjacent to each other in the front and back, the fuel piping can be shortened and the fuel system can be simplified.

Furthermore, the engine is located below the seat at approximately the center of the vehicle in the front-rear direction, lowering the center of gravity.
In addition, the heavy object is located in the center of the vehicle body, and the fuel tank is arranged adjacent to this, making it possible to obtain a riding lawnmower with a well-balanced and low center of gravity, which is advantageous for operation.
By disposing the battery, which is a heavy object, at the rear of the engine as in the embodiment, the balance can be further improved.

The present invention has the advantages as described above.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory side view with main parts cut away, and FIG. 2 is an explanatory plan view. In the drawings, 1 is a lawn mower, 7 is an engine, 30 is a seat, 22 is a fuel supply device, 23 is a fuel tank, 24 is an exhaust pipe, and 25 is a muffler.

Claims (1)

[Claims] 1. In a riding lawn mower equipped with a steering wheel and a drive wheel at the front and rear of the vehicle body, and a lawn mowing cutter at the bottom of the vehicle body, a seat is provided approximately in the center of the vehicle body in the longitudinal direction,
An engine is disposed below the seat, a fuel system consisting of a fuel supply device, a fuel tank, etc. is disposed on one side of the engine in the vehicle width direction, and an exhaust system is disposed on the other side. A riding lawn mower characterized by: