JPH04207106A - Riding-type lawn mower - Google Patents

Abstract

PURPOSE:To obtain the subject mower having improved mowing workability at the root of a tree, etc., and steering operability by providing freely steerable front wheels and protruding a mower toward the front part of the machine body beyond the front end of the steering post of the driver's seat. CONSTITUTION:Machine body frames 1, 1 are provided with a pair of right and left rear wheels 3, 3 and a pair of freely steerable right and left front wheels 2, 2 and an engine 5 is mounted under a driver's seat 6 placed at the rear part of the machine body. A mower 7 is placed between the front and the rear wheels 2, 3 in a state to protrude toward the front part of the machine body beyond the front end of the steering post 13 of the driver's seat 6. The lawn mowing work can be carried out by introducing the mower 7 under the leaf and stalks of a tree and the machine can be driven while simultaneously observing the mowing position and the front side of the machine body.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a riding lawn mower.

[Conventional technology]

Conventionally, for riding lawn mowers, for example,
As started in Japanese Patent No. 304916, a mower is provided in the lower abdomen of the aircraft between the front and rear wheels supported by an arched frame, an engine is mounted on the upper part of the mower, and a driving section is provided above the mower. There was a configuration in which the steering handle post was installed directly above the front wheels.

[Problem to be solved by the invention]

Although the above-mentioned conventional structure is a riding type, the entire body is constructed in a compact shape so that lawn mowing work can be carried out efficiently and easily even in narrow spaces.

However, in the conventional structure described above, the handle post is located above the front wheel, so when mowing the lawn around a tree with low hanging branches and leaves, for example, the handle post may come into contact with the branches and leaves, and the steering Because there is a risk of touching the branches or leaves with someone else's hands, it is only possible to enter near the front end of the machine or the outer edge of the branches and leaves, and do not perform lawn mowing work at the base of the tree, that is, under the hanging branches and leaves. The drawback was that it could only be done effectively.

In addition, when operating the aircraft, the mower is located directly below the operator, so if the operator tries to control the mower while checking the lawn mowing situation while the aircraft is moving, the operator must visually observe the sideways position directly below. Not only that, but there was also the drawback that the front side of the aircraft was not sufficiently checked, resulting in a reduction in driving safety.

It is an object of the present invention to eliminate the above-mentioned drawbacks, improve workability for cutting edges at the base of trees, etc., and improve maneuverability.

[Means for Solving the Problems] The characteristic configuration of the first invention includes a pair of left and right rear wheels and a front wheel that can be steered and swung. A feature of the second invention is that the engine is mounted on the machine, and the mower is disposed between the front and rear wheels and protrudes toward the front of the machine body beyond the front end of the handle post in the driving section. The configuration is such that the rear wheels are operated in conjunction with the front wheels in a direction opposite to the front wheels as the steering operation is performed, and the characteristic configuration of the third invention is that the front wheels are provided as a pair of left and right wheels, and the front wheels are provided as a pair of left and right wheels, The driving force is configured such that power is supplied to the front wheels and the rear wheels via a transmission and a differential device, and a differential output of one of the differential devices is supplied to the right front wheel and the right rear wheel, The other differential output is configured to be supplied to the left front wheel and the left rear wheel.

[For production]

■ According to the characteristic structure of the first invention, since the front wheels are oscillated to steer the aircraft in turns, the aircraft can be driven with the same control feeling as a general passenger car, and the mower or the handlebar post protrudes forward. Therefore, when checking the lawn mowing work status, the mowing area is located below and in front of the operator, so the operator can drive while visually checking the lawn mowing position and the front of the machine at the same time.

Moreover, the front wheel protrudes further forward than the mower, that is, more forward than the front end of the handle post, and only a low-position frame member exists in front of the handle post to support the front wheel and mower. I will do it. As a result, when mowing the base of a tree with low hanging branches and leaves, the front wheel and mower will slip under the branches as the handle post approaches the outer end of the protruding branches. be able to.

(2) According to the characteristic structure of the second invention, in addition to the above-mentioned effect (2), the rear wheels are operated in the opposite direction to the front wheels, so that the trajectory of the turning center of the aircraft becomes a trajectory along the lateral direction between the front and rear wheels. Therefore, when changing direction during lawn mowing work, the turning center can be aligned with one side end of the mower.

■ According to the characteristic structure of the third invention, in addition to the above-mentioned operation (■) or operation (■), the driving force from the engine is supplied to the front and rear wheels via one differential device, and the right front and left wheels are , - Because it is driven to rotate in the direction of the driver's body, for example, if one of the four wheels rises due to undulations on the ground or spins idly while mowing the lawn. , the remaining three wheels will always maintain proper drive conditions.

〔Effect of the invention〕

(a) According to the first invention, even around trees with hanging branches and leaves, mowers can be inserted into the lower side of the branches and leaves to easily mow the lawn, and mowing work can be carried out safely. It became possible to secure sex.

In addition, there is a so-called front mower type lawn mower that has a mower connected to the front of the passenger type vehicle body, which can obtain the same effect as the above. However, in the case of the present invention, due to the rational arrangement structure, - the handling feeling similar to that of a membrane bundle vehicle is achieved. It has the advantage that it has a compact shape, and that the turning center is as close to the mower as possible, resulting in less uncut area.

(b) According to the second invention, in addition to the above-mentioned effects, by aligning the turning center with one side end of the mower during turning work steering, it is possible to minimize or eliminate the uncut area; This will improve work efficiency.

(c) According to the third invention, in addition to the effects (() and (+1)), even if one wheel becomes idle during steering, the remaining three wheels remain in contact with the ground. Because it is a state,
This makes it possible to reliably propel the aircraft without causing extreme imbalance between the left and right outputs of the differential, improving operational safety.

〔Example〕

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

FIG. 6 shows a riding lawn mower according to the present invention. This lawn mower has a pair of left and right body frames (1) extending in the front and back direction, and a pair of left and right front wheels (2) at the front and rear ends of (1), respectively.
), (2) and the rear wheels (3), (3), and the engine (5) is mounted on the engine mounting frame (4), which is constructed and connected between the front and rear of the left and right fuselage frames (1), (1). ), a driving unit (6) is placed above the rear of the fuselage, and a mower (7) is installed in the lower belly of the fuselage between the front and rear wheels (2) and (3).

As shown in FIGS. 1 and 2, the fuselage frames (1), (1) are provided with the front side at a low level located below the driving section step (8), and the rear wheel transmission case (9). ) are connected and the rear side supporting the driver's seat (10) is bent and formed to have a high level, and its front end is bent and formed toward the left and right center in plan view to form a channel-shaped cross section. The connecting portion (11) is connected and fixed. A front wheel support frame (12) is fitted and connected to this connecting portion (11). A mower housing (7a) is connected and supported to this front wheel support frame (12).

The mower (7) is arranged so as to protrude toward the front of the aircraft body beyond the front end of the steering handle post (13) provided in series with the driver step (8). (7) is located. Therefore, on the front side of the handle post (13), the front wheel (2), the mower (7) and the fuselage frame (1
), and the upper side is an empty area.

Next, the transmission structure will be explained. The output shaft (14) of the engine (5) is configured to protrude downward and rotate around a vertical axis, and the output shaft (14) is connected to the engine (5) via a transmission belt (15). Power is supplied to the input shaft (16) of a hydrostatic continuously variable transmission (HST) arranged at the rear of the continuously variable transmission (HST), and the output shaft (16) of the continuously variable transmission (HST)
17), the power is transmitted to the differential gear (engine 9) via the endless chain (18). As shown in FIGS. 3 and 4, the left and right differential output of the differential device (19) is transmitted through the left and right transmission shafts (20), (20) in the rear wheel transmission case (9), and the bevel gear mechanism ( 21), the left and right rear wheels (24) via the vertical relay shaft (22) and the bevel gear mechanism (23), respectively.
(24), and a bevel gear mechanism (
25), a relay transmission shaft (26) extending in the front-rear direction, (2
6), bevel gear mechanism (27), vertical relay shaft (28)
, the left and right front wheels (2) via the bevel gear mechanism (29), respectively.
, (2) are configured to supply power to each separately.

Next, the steering operation structure will be explained. This lawn mower is
By rotating the steering handle (30), the left and right front wheels (2), (2) move in the same direction, and the left and right rear wheels (3),
(3) is configured to be operated in conjunction with the front wheels (2) and (2) in the opposite direction, and the turning center trajectory (+7)
is located approximately at the center of the aircraft in the longitudinal direction and on a line perpendicular to the longitudinal direction of the aircraft, and the operating system is configured such that at the limit of left and right turning operation, the operating system is at the center of rotation or approximately at the center of the aircraft in plan view. To be more specific, as shown in FIGS. 1 and 2, a fan-shaped plate-shaped pitman arm (32) that rotates together with a sector gear that engages and interlocks with the lower end of a steering shaft (31) is rotated around a vertical axis. This pitman arm (32
) and the respective knuckle arms for the front wheels (2), (2) (
33), (33) and drag link (34) separately.
, (34). Also, pitman arm (32) and drag link for rear wheel operation (35)
This drag link (25) is connected to the relay link (25), which is attached to allow the balance to swing freely around the horizontal axis (X).
36) to the knuckle arm (12) of the left rear wheel (3).
), and the right knuckle arm (42) via a tie rod (37). A swing angle increasing mechanism is interposed between the axle case and the knuckle arm of each wheel. The angle increasing mechanism (38) in the left front wheel (2) is shown in FIGS. 4 and 5. A rotary shaft (4) having an axis parallel to the vertical relay shaft (28) of the pivot host section (40) connected to the inside of the body of the support case (39) that internally supports the vertical relay shaft (28).
1) is fitted and supported, and a knuckle arm (33) is integrally and rotatably attached to this rotation shaft (41). A drive arm (43) that can rotate integrally is connected to the lower end of the rotation shaft (41), and a pin (45) is provided upright from the tip of the drive arm (43) and the axle case (44). ) are pivotally connected via a link (46). Here, the rotation radius of the connection point between the drive arm (43) and the link (46) is set larger than the rotation radius of the pin (45), and the drive arm (43), that is, the knuckle arm ( The axle case (44), that is, the wheel (2)
It is configured to have a large swing angle [swing range of about 180°]. In this way, the center of rotation of the aircraft at the rocking operation limit is configured to be substantially at the center of the aircraft in plan view, and the maximum turning locus of the aircraft is made extremely small. The angle increasing mechanism (38) is provided on each of the four wheels.

[Another example]

■ As mentioned above, instead of forming the rear wheel drive transmission system in a front view gate type, as shown in Figs. 9 and 10,
In addition to installing the mission case (47) in a low position,
An axle case (48) approximately coaxial with the rear wheel axis is extended from both left and right sides of the transmission case (47), and the rear wheel is attached to the outer end of the axle case (48) around the vertical axis (Y). (3)
may be rotatably connected. In other words, as shown in Fig. 11, the rear wheel support case (49) is attached to the axle case (48).
are connected to each other by a pin (50) so as to be relatively rotatable around the vertical axis (Y), and a bevel gear (51) is loosely fitted onto the pin (50).
), and a knuckle arm (33) is connected to the rear shaft support case (49).

Further, as shown in FIG. 8, the mission case (47) is a gear case (52) provided at the bottom of the engine (5).
), and is configured so that power is supplied from a camshaft (53) in the engine (5) via a bevel gear mechanism (54).

■ The drive transmission structure of the front and rear wheels (2) and (3) may be configured as follows.

As shown in Fig. 12, pressure oil from a variable displacement hydraulic pump (P) driven by an engine (5) is supplied to a pair of left and right hydraulic motors (M,), (M2), and each rear wheel (
3), (3), and also supplies pressure oil to the front hydraulic motor (M3), and the power of this hydraulic motor (M3) is transmitted to the differential! (55) t-intermediate left and right F
It is configured to drive l(2),(2).

In this case, the operation system for the front and rear wheels, as shown in FIG.
The front and rear wheels (2) and (3) may be configured to be steered and swung through the front and rear wheels (2) and (3).

■ The front and rear wheels (2) and (3) are driven by using the output of a hydrostatic continuously variable transmission (HST) via the front and rear differentials (57) and (58), respectively, as shown in Figure 14. Front and rear axes (2
), (3).

(2) The rear wheels (3) may be provided fixedly facing left and right, and one front wheel (2) may be provided at the center of the left and right.

It should be noted that the present invention is not limited to the structure of the attached drawings by adding numerals in the claims for convenient comparison with the drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of a riding lawn mower according to the present invention, and the first embodiment
The figure is a plan view showing the transmission system, Fig. 2 is a side view showing the transmission system, Fig. 3 is a longitudinal sectional front view showing the rear wheel drive system, Fig. 4 is a longitudinal sectional front view showing the front wheel drive system, and Fig. 5 is a plan view showing the angle increasing mechanism, FIG. 6 is an overall side view, FIG. 7 is a plan view showing the steering operation state, and FIG. 8 is a rear side view of another embodiment.
FIG. 9 is a side view of another embodiment, FIG. 10 is a rear view of another embodiment, and FIG. 11 is a sectional view showing a wheel support structure of another embodiment.
FIG. 12 is a traveling drive system diagram of another embodiment, FIG. 13 is an operation system diagram of another embodiment, and FIG. 14 is a transmission system diagram of another embodiment. (2)...Front end, (3)...Rear wheel, (
5)...Engine, (6)...Driving section, (7)...Mower, (13)...Handle post, (19)... ...Differential device, (HS
T)...Transmission device.

Claims (1)

[Claims] 1. A pair of left and right rear wheels (3) and a front wheel (2) that can be freely steered and swung.
A driving part (6) is installed at the rear of the aircraft, an engine (5) is mounted below the driving part (6), and the engine (5) is mounted between the front and rear wheels (2) and (3). , and a riding lawn mower in which the mower (7) is disposed so as to protrude toward the front of the machine body beyond the front end of the handle post (13) in the driving section (6). 2. Along with the steering operation, the rear wheel (3) shifts to the front wheel (2).
2. The riding lawn mower according to claim 1, wherein the riding lawn mower is operated in a direction opposite to that of the mower. 3. A pair of left and right front wheels (2) are provided, and the engine (5) is provided with a pair of left and right front wheels.
) The power from the transmission (HST) and differential gear (19
) is configured to be supplied to the front wheels (2) and the rear wheels (3) via the differential device (19).
One of the differential outputs is the front right wheel (2) and the rear right wheel (3).
3. The riding lawn mower according to claim 1, wherein the other differential output is supplied to a front left wheel (2) and a rear left wheel (3).