JPH0733975Y2 - Lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention connects a mower to the lower part of the machine body between front and rear wheels so that the mower can move up and down, and projects a transmission input part to the left and right center part on the upper surface of the mower blade housing. The present invention relates to a lawn mower in which a pitman arm and knuckle arms of front and rear wheels are connected to each other via front and rear drag links.

[Conventional technology]

In this type of lawn mower, as a structure for steering the front and rear wheels in opposite phases, conventionally, bell cranks for operating the left and right rear wheel knuckle arms in opposite directions are provided near the rear axle case. The left and right knuckle arms for the rear wheels were connected to both ends of each of the two via left and right rear drag links, and one end of the bell crank and the pitman arm were connected by front drag links (for example, the actual open sho 61-44072 (See the official gazette).

[Problems to be solved by the device]

However, in the above-mentioned conventional technology, a bell crank for relay is required between the pitman arm and the knuckle arm for the rear wheels, and since separate rear drag links for the left and right knuckle arms for the rear wheels are required, There was a problem that the structure became complicated. Further, in the case where the mower is connected to the lower abdomen of the fuselage between the front and rear wheels, in order to prevent the transmission input portion at the center of the mower from contacting the lower portion of the fuselage even when the mower is raised, the above-mentioned conventional technique is used. Since the vertical space is limited due to the presence of the pit man arm in the center of the abdomen, the amount of vertical movement of the mower must be small, and the mower collides with the ground during rough terrain travel. There was a problem.

The present invention aims to eliminate the above disadvantages.

[Means for Solving the Problems]

A feature of the present invention is that, in the lawnmower having the structure described above, the pitman arm is arranged on one side of the machine body, and the front drag link is connected to a front wheel knuckle arm located on the same side as the pitman arm existing side, and , The rear knuckle arms are connected to each other by the rear tie rods, and the rear drag link is connected to the rear knuckle arm located on the side opposite to the side where the pitman arm is present so that the front and rear wheels can be steered in opposite phases. However, the portion corresponding to the transmission input portion on the front side of the rear drag link is set at a high position, and the rear side is bent and formed so as to bypass the lower part of the machine frame extending in the machine longitudinal direction.

[Action]

In other words, the rear wheel knuckle arm and the pitman arm are simply structured by connecting the rear wheel knuckle arms with the rear tie rod and directly connecting the rear wheel knuckle arm and the pitman arm with the rear drag link. There is no need to interpose a relay member for operating the left and right rear wheel knuckle arms in the opposite direction in the course of linking with the rear wheel, and it is not necessary to provide separate rear drag links for the left and right rear wheel knuckle arms. Since the steering operation can be performed, the structure can be simplified. In addition, the pitman arm arranged on one side of the aircraft and the knuckle arm for the front wheels located on the same side as the pitman arm existing side are connected by a front drag link, and the pitman arm and the pitman arm existing side are opposite to each other. Since the rear wheel knuckle arm located is linked by the rear drag link, the operating direction of the knuckle arm can be changed while the pitman arm and the front wheel knuckle arm or the pitman arm and the rear wheel knuckle arm are being linked. The front and rear wheels can be steered in opposite phases with a simple structure without the need for interposing a reversing mechanism for reversing. Moreover, since it is not necessary to interpose a relay member or a reversing mechanism in the middle of linking the pitman arm and the knuckle arm, it is possible to secure a large space for the lower abdomen of the body, so that the lower abdomen of the body between the front and rear wheels can be secured. When the mower is connected to the vehicle, even if the mower is greatly lifted, there is less risk that the transmission input portion projecting on the upper surface of the mower will contact the airframe. Furthermore, the pitman arm is arranged on the side, and
Since the front portion side of the rear drag link is located at a high position, the transmission input portion projecting on the upper surface of the mower is less likely to contact the airframe. Moreover, since the rear side of the rear drag link bypasses the lower part of the body frame, it is not necessary to make a significant structural improvement to the body frame in order to dispose the rear drag link in the diagonal direction of the body.

[Effect of device]

Therefore, according to the present invention, in order to reduce the turning diameter of the machine body and improve the lawn mowing workability, it is possible to obtain a structure in which the front and rear wheels can be steered in opposite phases with a simple structure. It is possible to raise it to a high position and avoid the inconvenience that the mower collides with the ground when traveling on rough terrain.

〔Example〕

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

FIG. 10 shows a riding lawn mower according to the present invention. In this lawnmower, a mower (4) is movably connected to the lower abdomen of a riding type traveling body (3) having a pair of left and right wheels (1) and (2) on the front and rear sides, and a mower is mounted on the rear portion of the body. A grass collecting container (5) for collecting grass is provided and configured.

The mower (4) is connected by a hydraulic cylinder (8) so as to be able to move up and down while maintaining a horizontal posture by a parallel four-link mechanism consisting of a pair of left and right front links (6) and rear links (7). . The front end of the front link (6) is a swing hook member (10) provided on the front part of the left and right body frames (9).
The rocking hook member (10) is configured to be lockable and unlockable by the rocking operation lever (11).
The rocking can be switched between a locked state and a released state. As shown in FIGS. 4 and 5, the rear link (7) connecting portion of the body frame (9) has a notch (12) formed in the lower surface of the body frame (9) having a U-shaped cross section. , Attach the downward U-shaped connecting bracket (13), insert the upper end of the rear link (7) into the connecting bracket (13), and pass the connecting pin (14) across them to pivotally connect. It is configured to do. A pair of reinforcing plates (15) and (15) are fixed over the inner surface lower part of the connecting bracket (13) and the inner surface of the machine body frame (9). Further, the connecting bracket (13) is formed with two pin through holes (16), (16) displaced in the front-rear direction so that the mounting position of the mower (4) can be changed and adjusted. An engaging hole (17) is provided in the center of each pin through hole (16), (16) toward the inside of the body, and a locking projection (18) continuously provided from the connecting pin (14) is engaged, The connecting pin (14) is structured so as to be prevented from rotating, and sliding wear of the connecting bracket (13) is prevented.

As shown in FIG. 6, the driving section step (20) in the control section (19) at the upper center of the traveling body (3) is mounted on the body frame (9) and the side edge is received by the auxiliary frame (21). I support it. In addition, a reinforcing member (22) is extended from the body frame (9) at an intermediate portion of the upper frame. The reinforcing member (22) is contacted by the rear link (7) when the mower (4) is raised, and has an upper limit. It is configured to regulate.

The mower (4), as shown in FIGS. 3 and 8,
The power of the engine (23) mounted on the front of the machine is supplied from the power take-off shaft (25) protruding forward from the rear mission case (24) through the universal joint (26) and the transmission shaft (27). The power of the bevel gear case (2) as a power transmission input portion projecting in the left and right center portions on the upper surface of the cutting blade housing (28) of the mower (4)
Input from 9). In this way, since the transmission part for driving the mower (4) is located below the operation part step (20) in the left and right center part of the airframe, the transmission shaft (2
In order to eliminate the problem that it becomes difficult to connect or disconnect 7), the insertion hole (31) of the diff lock pedal (30) arranged on the left and right center side is made large as shown in FIG. The work for attaching / detaching the transmission shaft (27) can be visually recognized from above the step (20).

On the lateral side of the mower (4), a grass clippings is provided in the duct (32).
The blower case (33) for guiding the air toward the rear grass collection container (5) through the is detachably attached. Then, the connecting brackets (34), (34) on the cutting blade housing (28) side for supporting the blower case (33) are attached and fixed to the wheel attaching stay (35). The blower case (33) is formed by integral molding of synthetic resin material, and a blower fan is provided inside the case. This fan is configured to supply power from the bevel gear case (29) through the universal joint (36) and the transmission shaft (37). A protective frame (38) is provided on the outer peripheral portion of the blower case (33) to prevent the case (33) from being damaged by a collision with an external object, and both ends of the protective frame (38). Is fixed to the wheel mounting stay (35).

Next, the steering operation structure of the front and rear wheels (1) and (2) of the machine body (3) will be described.

This lawnmower is configured such that front and rear wheels (1) and (2) can be steered in opposite phases by rotating a steering handle (39) provided in a control section (19). More specifically, as shown in FIGS. 1 to 3, the left and right front wheels (1),
The knuckle arms (40a) and (40b) of (1) are interlockingly connected by the front tie rod (41), and the knuckle arms (42a) and (42b) of the left and right rear wheels (2) and (2) are connected to the front tie rod ( The knuckle arm (40a) for the front left wheel and the knuckle arm (42b) for the rear right wheel are respectively connected to the pitman arm (45) pivotally supported by the steering gear box (44) with the 43). Previous drag link (4
6) and the rear drag link (47) are linked together. That is, the pitman arm (45) is projected to the left lateral one side through the hole (48) formed in the left body frame (9), and is positioned laterally outward along the left body frame (9). The front drag link (46) is linked to the left front wheel knuckle arm (40a). Then, the pitman arm (45) and the knuckle arm for the right rear wheel (42
The rear drag link (47) interlockingly connected with b) is inserted through the hole (48) of the body frame (9),
Front mower (4) bevel gear case (29)
The corresponding portion is located at a high position, and the rear side is bent downward so as to bypass the lower side of the right side body frame (9).

In this way, a four-wheel steering structure in which the front and rear wheels (1) and (2) steer in opposite phases and make small turns can be obtained in a simple structure, and the amount of vertical movement of the mower (4) can be increased. It can be set.

[Another embodiment]

The pitman arm (45) is projected rightward and outward from the right body frame (9) to interlock the front drag link (46) with the right front wheel mechanism knuckle arm (40a) and the rear drag link (47). ) May be connected to the knuckle arm (42b) for the left rear wheel in an interlocking manner.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the lawn mower according to the present invention. FIG. 1 is a plan view showing a steering system, FIG. 2 is a rear view showing the steering system, and FIG.
Fig. 4 is a side view showing a steering system, Fig. 4 is a perspective view of a rear link connecting portion, Fig. 5 is a sectional view of the rear link connecting portion, Fig. 6 is a sectional view of a step supporting portion, and Fig. 7 is a mower. Side view of the connecting part,
FIG. 8 is a plan view showing the drive system, FIG. 9 is a plan view of the step portion, and FIG. 10 is an overall side view of the lawn mower. (1), (2) ... Wheels, (4) ... Moore, (9) ...
… Airframe, (28) …… Cutting blade housing, (29)…
… Transmission input, (40a), (40b), (42a), (42b)…
… Knuckle arm, (43) …… Rear tie rod, (45)…
… Pitman Arm, (46), (47) …… Drag link.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masamin Fukuda 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd.Sakai Works (72) Hironori Tsuchihashi, 64, Ishizukitamachi, Sakai City, Osaka Sakai Works (56) References JP 59-100057 (JP, A) JP 63-232078 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A mower (4) is vertically movably connected to a lower portion of the body between front and rear wheels (1) and (2), and a transmission input is made to a central portion of the mower (4) on an upper surface of a cutting blade housing (28). The part (29) is projected, and the knuckle arm (40) of each of the pitman arm (45) and the front and rear wheels (1) and (2) is provided.
A lawn mower in which a), (40b), (42a), and (42b) are connected to each other via front and rear drag links (46) and (47), wherein the pitman arm (45) is laterally aligned with the body. Placed on the side,
The front drag link (46) is connected to the front wheel knuckle arm (40a) located on the same side as the pitman arm present side, and the rear wheel knuckle arms (42a) and (42b) are connected to each other by the rear tie rod (43). And the rear drag link (47) is connected to the rear knuckle arm (42b) located on the side opposite to the side on which the pitman arm (45) is present to connect the front and rear wheels (1) and (2) in opposite phases. Of the rear body of the body frame (9) extending in the machine longitudinal direction with the rear input side (29) corresponding portion on the front side of the rear drag link (47) set to a high position. A lawn mower that is bent to bypass the lower part.