JPH0759431A - Wheel traveling-type mower - Google Patents

Abstract

PURPOSE:To provide the subject mower enabling bush cutting work to be performed close to a sloping ground or ridges by a simple constitution and operations. CONSTITUTION:A transmission case 1 is served as base frame, and the lower side of the rear of the transmission case is equipped with a pair of left and right traveling wheels 2, the upper side of the rear of the case 1 an engine and a steering handle 4 extending backwardly slant upward from the rear of the case 1, and the lower side of the front of case 1 a reaping section 5. This transmission case 1 is housed with the output shaft pulley of the engine and the revolving shaft pulley of the reaping section 5 and a transmission belt is wound over these pulleys. The traveling wheels 2 are mounted on the lower side of the rear of the case 1 via a center swing mechanism 22 having the 1st support shaft having an axial line in longitudinally parallel with the central part in the width direction of the wheel shaft 21 and the 2nd support shaft 24 having an axial line in vertically parallel with the central part. The transmission case 1 is laterally tiltable relative to the ground surface through the 1st support shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel-running type mower for carrying out mowing work while operating and walking on the ground with traveling wheels.

[0002]

2. Description of the Related Art A lawn mower having traveling wheels has been publicly known, and a vehicle body equipped with an engine is provided with two traveling wheels, left and right, which are rotationally driven by the power of the engine. An example of performing the mowing work by the cutting blade provided on the lower front portion of the vehicle body while maneuvering while walking with the steering handle is described in, for example, JP-A-63-36707.

Further, in the prior art disclosed in Japanese Patent Laid-Open No. 261312/1990, the left and right sides, which are driven by a motor different from the engine, are provided below the body on which the engine is mounted.
It is disclosed that the vehicle is equipped with traveling wheels, and while carrying out walking control on the ground by a steering handle that is also provided at the rear of the vehicle body, the cutting blade provided at the lower front portion of the vehicle body is used for mowing work. Then, the cutting height by the cutting blade can be changed to two steps, high and low, and the angle position of the cutting blade with respect to the machine body and the position of the cutting blade can be laterally displaced to mow work on sloping ground and side vertical surfaces. A technology that enables the above is disclosed.

[0004]

By the way, in a conventionally proposed wheel-running mower, an axle for supporting left and right running wheels is prevented from swinging with respect to a lower side of a body equipped with an engine. It is configured to be pivotally supported at a fixed position.

In a wheel-running type mower, the traveling wheels support a machine body having a mowing unit to travel on the ground.
With respect to the aircraft supported by the running wheels, the mowing part enables angle adjustment to suit mowing work on sloping ground,
In addition, it is desirable that the cutting portion be configured to be displaceable to the lateral position in order to enable cutting close to the ridge. In this case, in the case of the conventional lawn mower, the above-mentioned prior art (Japanese Patent Laid-Open No. 2-26131) is possible because it enables the above-described angle adjustment and the configuration in which the reaper is moved to the lateral position close to the ridge.
As disclosed in Japanese Patent Laid-Open No. 2), it becomes necessary to provide the support member of the mowing section with a special angle adjusting means and a special shifting means. Since the conventional mower is equipped with such means, the entire structure of the conventional mower is considerably complicated, and its operation is complicated.

According to the present invention, it is possible to adapt the mowing part to the mowing work on the sloping ground by a simple means without the need for the special angle adjusting means or the shifting means as described above for the supporting member of the mowing part. It is an object of the present invention to provide a wheel-running type mower having an adjustable angle and a lateral shift.

[0007]

As means for achieving the above object, the present invention uses a transmission case extending in the front-rear direction as a base frame, and a pair of left and right running wheels on the lower rear side of the transmission case, The engine is located on the upper rear side, the steering handle is extended rearward and obliquely upward at the rear of the case, and the mowing section is arranged on the lower side at the front of the case, and the output shaft pulley and the mowing section of the engine are installed in the transmission case. The rotary shaft pulley is installed in the interior and the transmission belt wound between both pulleys is used to transmit the engine rotational power to the reaping section. Is mounted on the lower rear side of the transmission case via a center swing mechanism having a first support shaft having an axis line extending along the axis and a second support shaft having an axis line extending in the up-down direction. hand Transmission case supported on the right of the running wheel, the right slope with respect to a ground plane through a first support shaft,
It can be tilted to the left, and the angle between the axle and the transmission case can be displaced with respect to the traveling direction via the second support shaft. It is characterized in that it is supported so that it can be displaced to the right and left from the center position.

Another feature of the present invention is that the left and right traveling wheels are provided with a required camber angle so as to open upward, and the transmission case of the transmission case is further provided via the second support shaft. From the center position between the left and right running wheels,
At the time of shifting to the right side or the left side, the engaging rod provided on one side between the axle and the rear part of the transmission case is selectively engaged with the recess of the position regulating plate provided on the other side, so Another feature is that the angle between the axle and the transmission case can be locked.

[0009]

In the mower configured as described above, when the steering handle is tilted rightward or leftward, the transmission case supported by the left and right running wheels via the first support shaft is moved to the right. The cutting operation can be performed with the cutting blade surface tilted to the left or to the left, with the cutting blade surface along the sloping ground (slope).

When the front portion of the transmission case is swung to the right or left by the steering handle, the front portion of the transmission case supported between the left and right traveling wheels via the second support shaft is moved to one side. By shifting to the right side or left side so that the reaping part at the front of the transmission case is located on the extension line of the traveling locus of one running wheel, the reaping part can be brought close to the ridge and It is possible to smoothly carry out the close brush cutting work.

The tilting operation and the shifting operation of the mowing section as described above are achieved by a structure in which the center part of the axle is attached to the rear part of the transmission case through a center swing mechanism having first and second supporting shafts. Since the transmission case itself equipped with the mowing part is not provided with any special angle adjusting means or shifting means, the structure is extremely simple, and the mowing work suitable for the desired sloping land is made possible by the simple structure and operation. Also, it is possible to carry out mowing work close to the ridge.

Further, in the case where the left and right traveling wheels are provided with a required camber angle that opens upward,
Improves the straightness of the running wheels when driving on sloping ground or when driving through ridges. In addition, the front part of the transmission case is moved to the right of the center position between the left and right running wheels via the second support shaft. In the case where the displacement angle between the axle and the transmission case can be locked when it is transferred to the left side, it is possible to obtain the effect that the bush cutting work can be performed stably.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a side view and a plan view showing an entire wheel traveling type mower according to the present invention. First, the overall configuration will be described. A transmission case 1 extending in the front-rear direction (traveling direction) is used as a base frame. In the transmission case 1,
A pair of left and right running wheels 2 are provided on the lower rear side, and an engine 3 is provided on the upper rear side. A steering handle 4 extending rearward and obliquely upward is provided at the rear of the transmission case 1, and the transmission case 1 is provided.
The reaper 5 is arranged on the lower side of the front part of the.

The transmission case 1 is formed by joining an upper case 11 and a lower case 12, which are divided into upper and lower parts, in a monaca shape and connecting their peripheral portions with a plurality of fastening bolts. In the inner spaces of the upper and lower cases 11 and 12, the output shaft pulley 31 of the engine 3 described later and the cutting unit 5 are provided.
And a rotary shaft pulley 51 of
A transmission belt 13 which is wound around between 1 and 51 is installed inside the transmission case 1.

According to the present invention, the pair of left and right traveling wheels 2 are formed such that an intermediate portion in the width direction of an axle shaft 21 supporting the traveling wheels 2a and 2b is bent in a concave shape, and the intermediate portion in the width direction of the axle shaft 21 is bent. However, the transmission case 1 via the center swing mechanism 22
It is attached to the lower rear part of the rear. Ie axle 2
A first support shaft 23 having an axis line extending in the front-rear direction is provided in the middle portion in the width direction of 1 so as to project forward, and the first support shaft 23 is connected to the tubular portion 22 a of the center swing mechanism 22. A center swing mechanism 22 is coupled to an intermediate portion of the axle 21 by rotatably fitting and retaining the same. The center swing mechanism 22 is additionally provided with a second support shaft 24 having an axial line in the vertical direction, and the second support shaft 24 is attached to the lower surface of the lower case 12 of the transmission case 1 by a mounting plate. Two
5, a pair of left and right traveling wheels 2 are attached to the lower side of the rear portion of the transmission case 1 via a center swing mechanism 22 by rotatably fitting with respect to 5.

When the left and right traveling wheels 2 are attached to the lower rear part of the transmission case 1 via the center swing mechanism 22 described above, the transmission case 1 supported by the left and right traveling wheels 2a and 2b is first shown in FIG. As shown, the first support shaft 23 allows tilting to the right and left, and the second support shaft 24 allows the front portion of the transmission case 1 to travel to one side as shown in FIG. The wheels 2a or 2b can be displaced rightward or leftward so as to be located on the extension line of the traveling path of the wheel 2a or 2b.

According to the present invention, the pair of left and right traveling wheels 2 are pivotally supported on the axle shaft 21 with a required camber angle so that the traveling wheels 2a, 2b are opened upward.

Further, in the present invention, a single engaging rod 26 is provided in the widthwise intermediate portion of the axle shaft 21 so as to project rearward and obliquely upward in a direction opposite to the above-mentioned first support shaft 23, On the other hand, on the lower surface of the lower case 12 of the transmission case 1, the position regulating plate 1 is curved and protrudes rearward and obliquely downward.
4, a plurality of engaging recesses 14a are formed in the width direction of the curved end portion of the position regulating plate 14, and the front portion of the transmission case 1 is placed on the right side through the second support shaft 24. When it is displaced to the left or to the left, the engaging rod 26 is selectively engaged with one of the concave portions 14a formed in the curved end portion of the position regulating plate 14, so that the axle 21 and the transmission case 1 are separated from each other. The angle can be locked at the transition position.

The output shaft 32 of the engine 3 is mounted along the vertical axis and the output shaft pulley 31 at the lower end is located in the transmission case 1. The engine 3 has its engine body. The mounting plate 34 made of resin fixed to the lower surface of the mounting plate 15 is mounted so as to overlap the mounting plate 15 fixed to the upper surface of the transmission case 1. At the time of mounting, the mounting plate 34 and the mounting plate 15 are mounted. Is mounted so that the mounting plate 34 is rotatably overlapped with the mounting plate 15 about the mounting shaft 33 which is displaced to the one side from the axis of the engine output shaft 32 as a fulcrum, whereby the mounting state of the engine 3 is supported by the mounting shaft 33. It can be rotated horizontally as a result of this horizontal rotation.
1 is mounted so as to be movable in the front-back direction.

In order to rotate the engine 3,
The operation wire 3 is attached to the engine body through a locking member 35.
One end (end portion of the inner wire) of 6 is locked, and the other end of the operation wire 36 is fixed to the mounting plate 15.
6 and the tip of the outer wire goes through the traveling handle 4.
When the operator moves the operating lever 45 and pulls the inner wire of the operating wire 36, the engine 3 horizontally rotates about the mounting shaft 33 as a fulcrum. Output shaft pulley 31
Moves to the rear position, and when the inner wire of the operation wire 36 is returned, the engine 3 is returned to the original position by the spring force of the spring 37 interposed between the support member 16 and the locking member 35. There is.

When the engine 3 is horizontally rotated to move the output shaft pulley 31 to the rear position, however, the engine 3 is wound over the output shaft pulley 31 and the rotary shaft pulley 51 of the cutting section 5. Tension acts on the transmission belt 13 to transmit the rotational power of the engine 3 to the mowing section 5, and when it is returned to the original position, the tension action of the belt 13 is canceled and power transmission is turned off.

As shown in FIGS. 6 and 7, the steering handle 4 is divided into a lower half portion 41 and an upper half portion 42 at left and right handle members made of pipe material at an intermediate position in the longitudinal direction thereof. The lower half portion 41 is formed as a horizontal portion 41 in which the left and right handle members are independently bent at their lower ends.
By fitting a and 41b into the recessed grooves 17 formed in the peripheral portions on both sides of the upper case 11 of the transmission case 1, and connecting the both by fastening bolts on the peripheral portion, the lower half portion 41
The left and right handle members are attached to the transmission case 1.
On the other hand, in the upper half portion 42, a pipe material is bent and formed in a U shape, and the U-shaped end portions 42 a can be attached to and detached from the handle member end portions of the independent left and right lower half portions 41 by the bolts 44. By coupling, the U-shaped end portion 42a is bridged between the left and right handle members so as to bridge.

In the illustrated embodiment, the mowing unit 5 is a cord blade type mowing unit 5 in which a synthetic resin thread blade 54 is pulled out from the inside of a rotating body 53 provided at the lower end of a rotary shaft 52. The rotating body 53 and the lower case 12 of the transmission case 1
A protective cover 55 for preventing solid objects such as cuts and stones thrown and scattered by the rotation of the thread blade 54 from coming into contact with a worker behind is provided between the protective cover 55 and
Are bolted to the peripheral edge of the transmission case 1. The above-mentioned reaping unit 5 may be configured by using a conventionally known disc-type cutting blade instead of the cord blade type, and the form of the reaping unit 5 is not particularly limited.

In FIG. 1, reference numeral 38 is an intake duct connected to an intake port of a carburetor (not shown) of the engine 3, and the front end opening of the intake duct 38 is rearward along the steering handle 4. It is opened to the position and prevents dust and debris generated by mowing work from being sucked into the engine 3. Reference numeral 39 denotes a throttle lever provided near the grip portion of the steering handle 4.

Next, an example of use of the mower constructed as described above and its operation will be described. The mowing machine is moved to the desired work place by the operator pushing the steering handle 4 from the rear position to move it to a desired work place, and when starting the operation of the mowing work, the operation lever 45 provided near the grip of the steering handle 4 is movable. Then, the operation wire 36 is pulled. As a result, the engine 3 horizontally rotates, and the output shaft pulley 31 moves to the rear position in accordance with the horizontal rotation, so that the output shaft pulley 31 of the engine 3 moves.
And a rotary shaft pulley 51 of the mowing unit 5, a tension action is generated in the transmission belt 13 and the rotational power of the engine 3 is transmitted to the rotary shaft 52 of the mowing unit 5, thereby rotating the rotating body 53. The thread blade 54 provided for is rotated to perform the mowing work.

At the end of the mowing work or the interruption of the work, the lever 45 is moved to return the pulling of the operation wire 36. As a result, the engine 3 is returned to the original position by the spring force of the spring 37 interposed between the support member 16 and the locking member 35, the power transmission by the transmission belt 13 is turned off, and the rotation of the yarn blade 54 is stopped. To do.

During normal mowing work on flat ground,
Transmission case 1 supported by left and right traveling wheels 2a, 2b
The horizontal position, and the operator operates the steering handle 4 from the rear position to provide the mowing section 5 provided on the lower front side of the transmission case 1.
The cutting operation is performed such that the cutting surface of the thread blade 54 is moved forward with the cutting surface along the ground.

Further, at the time of mowing work on a sloping ground, the steering handle 4 is tilted rightward or leftward corresponding to the direction of inclination of the ground. As a result, the transmission case 1 supported by the left and right traveling wheels 2a and 2b via the first support shaft 23 is tilted to the right and the left, and the cutting surface of the thread blade 54 of the cutting section 5 is changed to the inclined surface ( Carry out the mowing work so that it travels forward while keeping it along the slope.

Further, at the time of mowing work on the ridge, the front part of the transmission case 1 is swung to the right or left by the steering handle 4. As a result, the front portion of the transmission case 1 supported by the left and right traveling wheels 2a and 2b via the second support shaft 24 is offset to one side as shown in FIG. By shifting to the right side or the left side so as to be located on the extension line of the traveling path, the mowing section 5 provided on the lower front side of the transmission case 1 is brought close to the ridge, and the vehicle is allowed to travel forward in this state. Perform the bush cutting work on the ridge.

The tilting operation of the mowing section 5 corresponding to the above-mentioned sloping land and the shifting operation of bringing the mowing section 5 closer to the ridge are achieved by the center swing mechanism 22 having the first and second support shafts 23 and 24. , A transmission case 1 in which the reaper 5 is arranged
Does not have any special angle adjusting means or transfer means, the structure is very simple, and the tilting operation and transfer operation can be performed by tilting the steering handle 4 to the right or left.
Further, since the structure is achieved by the action of swinging to the right or left side, it is possible to perform the mowing work suitable for the desired sloping land and the mowing work close to the ridge with a simple structure and operation.

Further, in the structure in which the left and right running wheels 2a, 2b are provided with a required camber angle that opens upward, the running wheels 2a, 2b when running on a slope or when running through a ridge. You can improve straightness.

Further, when the front portion of the transmission case 1 is transferred to the right or left side from the center position between the traveling wheels 2a and 2b via the second support shaft 24, the front portion is provided in the center portion of the axle 21. The engaging rods 26 are selectively engaged with the corresponding recesses 14a of the position regulating plate 14 provided on the transmission case 1 side so that the angle between the axle 21 and the transmission case 1 can be locked at the shift position. In this case, it is possible to obtain an effect that the grass cutting work on the ridge can be stably performed.

Further, as shown in the embodiment, the left and right running wheels 2
When the central portion in the width direction of the axle shaft 21 that supports a and 2b is bent in a concave shape, the rear ground clearance of the transmission case 1 supported between the left and right traveling wheels 2a and 2b becomes low, and this transmission case If the rear ground height of 1 and the ground contact height of the mowing part 5 arranged on the lower side of the front part of the transmission case 1 are configured to have substantially the same height, the transmission case 1 will be in a horizontal state during mowing work. The cutting height can be kept constant by advancing while maintaining.

[0034]

As described above, according to the mowing machine of the present invention, the operation of tilting the steering handle 4 to the right or to the left tilts the cutting section 5 so as to conform to the sloping ground (slope). In addition, the steering handle 4 swings the front part of the transmission case 1 to the right or left side so that the reaping part 5 is offset to one side so that the reaping part 5 can be moved closer to the ridge. Therefore, it is not necessary to provide the transmission case 1 in which the mowing part 5 is arranged with a special cutting blade angle adjusting means or a transposing means, and a mowing work suitable for a desired sloping ground by a simple configuration and operation, Weeding work can be performed close to the ridge.

When the left and right traveling wheels 2a, 2b are provided with a required camber angle that opens upward, the traveling wheels when traveling on a sloping ground or when traveling with a ridge between them. The straightness of 2a and 2b can be improved, and further,
When the front portion of the transmission case 1 is displaced to the right or left side from the center position between the traveling wheels 2a and 2b via the second support shaft 24, an engaging rod provided in the central portion of the axle 21. Two
When 6 is configured to be selectively engaged with the corresponding recess 14a of the position regulating plate 14 provided on the side of the transmission case 1 to lock the angle between the axle 21 and the transmission case 1 at the shift position, mowing The effect that the work can be stably performed can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of an entire wheel-running mower according to an embodiment of the present invention, partially shown in section

FIG. 2 is an overall plan view of the same mower with the engine body removed.

FIG. 3 is a plan view illustrating a rotating state of the engine.

FIG. 4 is a plan view showing a state in which a transmission case is angularly displaced with respect to an axle of traveling wheels.

FIG. 5 is a plan view showing a state in which a transmission case supported by traveling wheels is tilted.

FIG. 6 is a perspective view showing a portion of a steering handle.

7 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission case 11 Upper case 12 Lower case 13 Transmission belt 14 Position regulation plate 14a Engagement recess 15 Engine mounting plate 16 Supporting member 17 Recessed grooves 2 Running wheels 2a, 2b Left and right running wheels 21 Axle 22 Center swing mechanism 22a Cylindrical part 23 1st support shaft 24 2nd support shaft 25 Mounting plate 26 Engaging rod 3 Engine 31 Output shaft pulley 32 Output shaft 33 Mounting shaft 34 Mounting plate 35 Locking member 36 Operating wire 37 Spring 38 Intake duct 38a Expansion part 39 Throttle lever 4 Steering handle 41 Lower half 41a, 41b Horizontal part 42 Upper half 42a U-shaped end 44 Bolt 45 Operation lever 5 Mowing part 51 Rotating shaft pulley 52 Rotating shaft 53 Rotating body 54 Thread blade 55 Protective cover

Claims (3)

[Claims] 1. A transmission case extending in the front-rear direction is used as a base frame, and with respect to the transmission case, a pair of left and right traveling wheels are provided on the lower rear side, an engine is provided on the upper rear side, and a steering handle extending obliquely rearward and upward from the rear portion of the case. And a reaper on the lower side of the front part of the case, and the output shaft pulley of the engine and the rotary shaft pulley of the reaper are housed in the transmission case, and the transmission belt is wound between both pulleys. The rotational power of the engine is configured to be transmitted to the mowing part, and the pair of left and right running wheels have a central portion in the width direction of the axle,
The axle is mounted on the lower rear side of the transmission case via a center swing mechanism having a first support shaft having an axis extending in the front-rear direction and a second support shaft having an axis extending in the up-down direction. The transmission case supported by the left and right running wheels via the first support shaft can be tilted to the right and left with respect to the ground contact surface via the first support shaft, and the second support shaft can be mounted in the traveling direction. The angle between the axle and the transmission case is displaceable via the support, and the reaping part placed under the front part of the transmission case is supported so that it can be displaced to the right and left from the center position between the left and right running wheels. A characteristic wheel-running mower. 2. The wheel according to claim 1, wherein the pair of left and right traveling wheels are pivotally supported on an axle with a required camber angle so that the left and right traveling wheels are opened upward. Traveling mower. 3. An engaging rod is provided on one side and a position regulating plate is provided on the other side between the widthwise central portion of the axle supported by the center swing mechanism and the rear portion of the transmission case, When the front portion of the transmission case is displaced to the right or left side of the center position between the left and right traveling wheels via the second support shaft, the position regulating plate is provided with the engaging rods corresponding to the respective positions. 3. A structure in which a plurality of engaging recesses to be engaged are formed, and an angle between the axle and the transmission case can be locked by selectively engaging a rod in the recesses. Wheel-running mower described.