JPS6181718A - Riding type lawn mower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Applicability!?) The great invention relates to a riding lawn mower on which a worker rides and mowing the lawn.

(Prior art) Riding lawn mowers are equipped with a cutter under the body, drive the cutter using engine power to mow the lawn, drive wheels to move, and are operated by a passenger on board. It is provided.

Many of these types of riding lawn mowers have an engine mounted in the front like a car, and have a seat in the middle of the body and a grass bag in the rear, so there is a risk that the front and rear dimensions will be large. Furthermore, since the front engine drives the cutter in the center of the vehicle body that drives the rear wheels, the power transmission system becomes long and may become complicated.

Therefore, US Pat. No. 3,169,358 has been proposed in which the engine is provided in the middle of the vehicle body. According to this, since the engine is located in the center of the vehicle body, it is possible to achieve a slight reduction in size compared to the conventional vehicle.

(Technical issue) Although the engine of conventional lawn mowers is located in the middle of the vehicle body in the longitudinal direction, the engine is located at the rear of the cutter housing at the bottom of the vehicle body, and the size of the cutter housing requires storage space for the engine. Therefore, it is still difficult to say that this is a sufficient solution for achieving miniaturization.

The present invention has been made to solve the above technical problems,
The purpose of this is to create a riding lawn mower with an engine mounted on the body H that is rationally arranged in relation to the cutter mounted under the body, making the overall shape more compact and making this type of lawn mower more compact. is to provide.

(Means for solving the technical problems) The means for solving the technical problems described in H below are provided in a riding lawn mower in which the engine is provided in the vehicle body and the cutter housing is provided below the approximately central portion of the vehicle body in the longitudinal direction. The engine is disposed at the center of the vehicle body in the longitudinal direction and within the outline of the cutter housing in a plan view.

(Operation by Means H) According to the means H, the engine in the center of the vehicle body - H is disposed within the outline of the cutter housing below the center of the vehicle body, and the drive and transmission system for the rear wheels is located at the rear of the vehicle body. If it is installed, it can be placed as far forward as possible, and the drive system of the cutter can also be placed close to it, making it possible to shorten the longitudinal dimension of the car body as much as possible, making it more compact. Since the systems are closer together, the transmission system can be simplified.

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

FIG. 1 is an explanatory side view with main parts cut away, and FIG. 2 is an explanatory plan view.

The frame (2) that constitutes the body of the riding lawn mower (1) has two left and right main frame members (20
1) , (202), and cross members (203) and (2G4) at the front end and rear end, and the middle cross member is omitted for reasons of other parts. Such a frame (2
) Cover (3) that forms the exterior of the car body so as to cover the sides and
), and the cover (3) includes a front cover (301) that stands up at the front, an intermediate cover (303) that serves as a seat cover and an engine cover at the middle part in the longitudinal direction, and a lower end of this and a front cover (3013) that The floor part (302) that connects the space is made up of a cable cover (300, etc.) extending rearward from the intermediate force / (- (303). The left and right members (20t) of the frame (2), the intermediate part of (2G 2) A seat post member (205) is installed on the rear side, 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 two front wheels (4) on the left and right that form two steering wheels, and a rear wheel (5) that forms a driving wheel.
), (5), the front wheels (4), (4) have a small diameter, and the rear wheels (5), (5) have a large diameter. wheels (4),
(4) is the handle shirt inside the handle column (801) installed vertically inside the front cover (301) (802)
The vehicle is driven left and right using a round handle (803') that rotates and performs steering, thereby forming a steering mechanism (8).

An engine (7) is disposed approximately in the center of the frame (2) in the longitudinal direction and in the vehicle width direction, and the skin surrounding and upper part of the engine are covered with a cover (363). A seat (30) is arranged above. engine(
7) uses a vertical engine with a vertical crankshaft in the embodiment, and its output shaft (701) is connected to the engine (7).
). Due to the placement of such an engine, the frame (
In 2), the front section only has a steering mechanism, and the front section of the vehicle body becomes shorter.

between the rear wheels (5), C5) and above the rear axle (
501) Is there a gear shift in the rear and upper part? A transmission case (8) forming a cffl is disposed, a reduction case (8) is provided below the transmission case (8), and a rear wheel (501) is installed across the transmission case (8). An input shaft (11) is vertically installed downward from the transmission case (8), and the input shaft (11) is connected to the rear wheel (5).
01), and is arranged to hang down in a direction perpendicular to the input shaft (501), and an F part pulley (10) is fixedly installed in the middle part of the input shaft (11). A drive bevel gear (111) is attached to the E end of the input shaft (11), and a transmission case (8
) is provided with a driven bevel gear (aol) that meshes with the input shaft (11), which transmits the input to the input shaft (11) to the transmission mechanism, and transmits the input to the rear axle ( 501). The transmission (8) at the heel F is a frame member (201).

The rear end of member (202) and the rear end of member (202) substantially coincide with each other.
1), (202) do not protrude rearward from their rear ends, and only stays (29), (29), which will be described later, are provided at their rear ends.

A driving pulley (12) is fixedly installed at the lower part of the output shaft (701) of the engine (7), and the pulley (12) is arranged at the same level as the upper pulley (10) of the transmission case (8). A belt (13) is wound around the pulleys (12) and (10), and the middle part of the belt (13) is pressed by a tension roller (14). By E, the output of the engine (7) is input to the transmission, and the latter width (5).

(5) to drive the cutter as described later.

A lower pulley (15) for driving the car is fixed to the lower end of the input shaft (11), and a cutter deck (I6) serving as a housing for the cutter is provided below the middle in the longitudinal direction of the vehicle body. The cutter deck (16) is in the shape of a cover that is open downward, has a circular shape with a large diameter in plan view as is clear from FIG.
Its outer diameter is approximately the same as that between the outer surfaces of the rear wheels (5), (5),
The outer end (183) in the vehicle width direction is approximately at the same level as the outer surface (502) of one rear wheel (5).
) does not protrude from the outer surface, or even if it does, it should be minimal. A discharge duct (184) is provided on the opposite side of one outer end (183) of the cutter key (16), and the duct (164) is located on the right side in the embodiment, and is located on the outer side ( right outward) and open the duct (1
The front wall (165) of 64) is inclined posterolaterally, and in the embodiment, the cutter (17), which will be described later, is rotated clockwise (clockwise) in FIG.
Then, the grass cut from the front wall is discharged to the rear and outside. The edge (IH) forming the opening of the duct (1B4) is linear in the front-rear direction, and the outer surface (50) of the rear wheel (5) on this side
It should be approximately the same as 3), but it should face further inside. Brackets (1B?), (
1G? ) Small diameter guide roller (188), (1
88) was added.

A cutter (17) is installed inside the car and Tadetsuki (18),
The drive shaft (171) of the cutter (17) is a holder (1
72), and a pulley (1
8) is fixedly installed, and the pulley (18) is connected to the already mentioned input shaft (11).
is connected to the lower pulley (15) via a belt (19).

As a result, the cutter (17) is powered by the pulley (1) with a carrot output.
5), (18), and is rotationally driven through the drive wheel (5).

(5) The cutter (17) moves and mowing the lawn.
) is Boo IJ (,12), to71/'p (13)
, 1 and 1 o) The rotational drive of the input shaft (11) is directly transmitted by the pulley (15). The cutter pulley (18) has the cutter deck (!8) located in the center of the rear direction of the vehicle body and is located in front of the output shaft (701), and the pulley (15) is located behind the rear axle (501). Therefore, the span between Boo1ba15) and (18) is long. Therefore, when adjusting the height of the cutter (17) under the lawn mowing height, the pulley (
The height of 1B) is also lowered by one foot.

On the other hand, the height of the pulley (15) remains the same, but the pulley (
15) and (18), the bell l-(1
9) The angle change is as small as possible, and it is possible to prevent the belt from coming off, causing uncertainty in power transmission, and uneven wear of the belt. Power transmission is reliable even if the pulley (18) falsely drops.

By the way, referring to the I- and lower adjustment mechanism of the cutter deck (1B), the bracket (211) provided at the front of the deck (16) is connected to the joint (212) and the link (213).
) is supported by a bracket (2H) hanging from the front end of the frame (2). On the other hand, a bracket (214) is installed on the rear part of the deck (1B), and this is connected to the link (215), guide stop, pa mechanism (2113), and lever (217) provided on the side. , lever (2
17) to lower the deck (16).

A fuel supply device (22) is provided at the front of the engine (7) below the seat (30), for example on the left side, and the supply device (22) includes a supply section (221) that houses a carburetor. The throttle lever (223) is equipped with an air cleaner (222) disposed on this side and adjusts the engine rotating machine outward.
'), pinch the lever (223) and rotate it,
A fuel tank (23) serving as a fuel storage device is arranged behind the supply device (22) on the negative side of the engine (7), which performs torque adjustment.
) from this lateral intermediate part to the rear and further rearward. In this way, the supply part R (22) and the fuel tank (23), which form the fuel supply system, are provided on the - side of the engine (7) in the front-rear direction, so the space on the side of the engine is used without waste, and the vehicle width is reduced. It can be kept small, and since it is arranged at the front and back, the piping for feeding the firing material can be extremely short, which makes the fuel feeding smooth and the piping greatly simplified. Furthermore, a fuel supply device (2
2) is installed on the opposite side of the deck (16) to the discharge duct (164), so it is protected from the influence of grass and dust associated with discharge.

There is an exhaust pipe (24) 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 outwardly from the middle part of this side of the engine (7), and extends from the rear end of the engine (7) outwardly. The muffler (25) is connected to the muffler 5 (25), and the muffler (25) is disposed from the middle part to the rear part of the outer side of the engine (7).
A clearance exists between the engine (7) and the corresponding side surface of the engine (7). A duct (2B) is provided so as to surround the exhaust pipe (24) and the muffler (25), and cooling air from a fan (not shown) attached to the engine (7) is passed through the duct (26), and the exhaust pipe (20 and muffler (25) and the duct) (2B) isolates the exhaust system from the outside, so even if the exhaust system is located below the seat (30), below the passenger's waist and behind the legs, heat insulation is ensured. . The exhaust system was installed on the negative side of the engine (7) and separated from the fuel supply system, so
Thermal protection of the fuel supply system can be achieved, and the engine
The exhaust system is installed on the side, which is advantageous in terms of space utilization, and because it is distributed to the left and right, the width of the vehicle can be reduced.The exhaust pipe (24) extends to the rear and sides, so the pipe length is secured, and the transmission can be installed at the rear. The space behind the engine can be used effectively without interfering with the power transmission device included in the vehicle and devices such as the battery (27) installed behind the engine, which will be described later.As a result, the length of the vehicle body in the longitudinal direction can be shortened. This makes it possible to reduce the vehicle width and make the vehicle more compact.

By the way, the battery (27) was installed in the space behind the engine (7) and the transmission was installed in the space in front of the space (8), making effective use of the space between them.

The previously mentioned cutter adjustment lever (217) 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 the engine (7) is provided at the rear of this side. In the embodiment, a shift pattern play (281) is provided above the muffler (25) on the outside, and the rod (282) which is operated for positioning is used to shift the transmission case (8) after the shift lever t<-(283) ltfm. One or more of these components constitute a shift operation system.

Also, the mayframe members of the frame (201), (20
2) At the rear end there are stays (29) spaced apart on the left and right,
(29), which allows it to be stored in an upright position with the rear end facing down, and the lower end (291) of the stay (29) and (29) is placed above the ground contact surface of the rear wheel (5). year,
When working with an anterior hill tilt, the installation of the lower end portion (291) prevents further inclination from the anterior hill tilt. Mote Stay (29)
, (29) It also functions as a beam bumper.

By the way, as mentioned above, the Kata housing (16) is disposed below the longitudinally central portion of the vehicle body (frame), while the engine (7) is disposed on the frame approximately at the longitudinally central portion thereof. As clearly shown in FIG. 2, it is disposed within the outline (A) of the car dual housing (16) in plan view.

By arranging the engine in this manner, the transmission case (8) and reduction case (9) that form the drive system and transmission system for the rear wheels (5) and (5) can be placed as close to the front engine side as possible, The rear wheels (5), (5) can also be brought as close as possible to the cutter housing (1B). Therefore, since there is no engine in the front part, the front part can be shortened, and the front and rear dimensions of the lawn mower can be made as short as possible, making it possible to downsize the lawn mower. Since the engine and the transmission case (8) are located close to each other, a simple transmission mechanism such as a belt transmission mechanism can be used as in the embodiment.

(Effects of the Invention) As is clear from the foregoing, according to the present invention, in a riding lawnmower, the engine is provided within the outline of the cutter housing provided below at the front and rear commercial center of the vehicle body in plan view. When the transmission system and drive system for the rear wheels are placed at the rear of the vehicle, they can be placed as far forward as possible, and since there is no engine at the front of the vehicle, the longitudinal dimensions of the vehicle can be reduced as much as possible. The engine and transmission system can be made shorter and more compact.

WIl, the transmission system can be simplified because the dynamic system is closer.

[Brief explanation of drawings]

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 drawing, (1) is the lawn mower, (2) is the frame that makes up the vehicle body, (4) is the front wheel, (5) is the rear wheel, (7) is the engine, (1B) is the car, housing, (17) ) is a cutter.

Claims (1)

[Claims] The vehicle body is equipped with four wheels including a steering wheel and a drive wheel at the front and rear of the vehicle body, a lawn cutter and a cutter housing surrounding the cutter housing are provided below the approximate center of the vehicle body, and a seat for a passenger is provided, and the cutter and drive wheels are mounted on the vehicle body. What is claimed is: 1. A riding lawn mower driven by an engine installed in a cutter housing, characterized in that the engine is disposed approximately in the center of a vehicle body within an outline of a cutter housing when viewed from above.