JP2688802B2 - Wheel mower - Google Patents

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 The wheel-running type mower itself as described above is disclosed, for example, in Japanese Patent Laid-Open No. Sho 63-36707 and Japanese Patent Laid-Open No. Hei-2.
It is conventionally known as seen in the prior art described in Japanese Patent Publication No. 261312. This type of mower is equipped with two left and right running wheels below the machine equipped with an engine, as seen in the preceding example, with a steering handle behind the machine and a mowing under the front of the machine. With a blade, a worker walking the steering handle extended to the rear of the machine operates the cutting blade provided on the front of the machine to move forward along the ground while performing mowing work. There is.

[0003]

In the conventionally proposed wheel traveling type mower, the engine is fixedly mounted on the machine body having the traveling wheels, and the cutting blade part to be driven from the output side of the engine. The power transmission system including the above is equipped with a clutch mechanism.

The above-mentioned clutch mechanism is an indispensable component in the case of a conventional mower in which the engine is fixedly mounted. In order to interpose such a clutch mechanism, in the conventional mower, many components are required for the transmission system, the number of parts is increased as a whole, the manufacturing cost is increased, the product price is expensive, and the machine body is expensive. There is a problem that the weight is relatively heavy.

SUMMARY OF THE INVENTION The present invention provides a wheel-running mower which is inexpensive and lightweight by eliminating the above-mentioned clutch mechanism, reducing the number of components of the transmission system, and greatly simplifying the mechanism as a whole. The purpose is.

[0006]

As a means for achieving the above object, the mowing machine according to the present invention uses a transmission case extending in the front-rear direction as a base frame, and a pair of left and right traveling parts are provided on the lower rear side of the transmission case. The wheels, the engine on the upper rear side, the steering handle extending obliquely upward and rearward from the rear of the case, and the mowing section on the lower side of the front of the case are arranged, and the output shaft pulley and the mowing section of the engine are arranged in the transmission case. The internal structure of the rotary shaft pulley and the transmission belt are wound between both pulleys, and the engine has the output shaft pulley with the mounting shaft deviated from the axis of the output shaft along the vertical direction as the fulcrum. It is mounted so that it can move in the front-rear direction, and when the engine is horizontally rotated by the operating part provided on the handle, the output shaft pulley moves to the rear position and a tension action occurs on the transmission belt. Te is transmitted to the rotational power reaper engine and to return to the forward position the power transmission is characterized in that comprising a structure for turning off.

[0007]

In the mowing machine configured as described above, the operator pushes the steering handle from the rear position to move the mowing machine forward at the desired work place, and when the operation of the mowing work is started, the handle is operated. The engine rotates the engine horizontally. Then, the output shaft pulley of the engine moves to the rear position, and the tension acts on the transmission belt wound between the output shaft pulley and the rotary shaft pulley of the mowing section, whereby the rotational power of the engine is transmitted to the mowing section. Then, the cutting blade is rotated to perform a desired mowing work.

When the mowing work ends or the work is interrupted, the engine is returned to the original position at the operating portion of the handle. As a result, the output shaft pulley of the engine moves to the front position and the tension effect of the transmission belt is eliminated, so that power transmission is turned off and rotation of the cutting blade is stopped.

As a result, the lawn mower does not require a clutch mechanism for connecting and disconnecting power transmission in the transmission system from the output shaft pulley of the engine to the rotary shaft pulley of the mowing section, and the number of constituent parts is reduced and the mechanism is reduced. It is greatly simplified, and the production cost is reduced and the weight of the aircraft is greatly reduced.

[0010]

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.

The pair of left and right running wheels 2 are both running wheels 2.
An intermediate portion in the width direction of an axle shaft 21 that supports a and 2b is bent in a concave shape, and the intermediate portion of the axle shaft 21 is attached to the lower rear side of the transmission case 1 via a center swing mechanism 22. That is, a first support shaft 23 having an axis extending in the front-rear direction toward the front is provided at an intermediate portion in the width direction of the axle shaft 21.
The first swing shaft 23 is rotatably fitted to the tubular portion 22a of the center swing mechanism 22 to prevent the first swing shaft 23 from coming off, so that the center swing mechanism 2 is provided at the middle portion in the width direction of the axle 21.
Two are connected. 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. 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 25.

When the left and right traveling wheels 2 are attached to the lower rear side 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.

The pair of left and right running wheels 2 are the two wheels 2.
A required camber angle is provided so that a and 2b are opened upward, and the shaft 21 is pivotally supported. Further, a single engaging rod 26 projects rearward and obliquely upward in a direction opposite to the above-mentioned first support shaft 23 at an intermediate portion in the width direction of the axle 21, while the lower side of the transmission case 1 is provided. A position regulating plate 14 is provided on the lower surface of the case 12 so as to be curved obliquely rearward and downward, and a plurality of engaging recesses 14a are formed in the width direction at the curved end of the position regulating plate 14. When the front portion of the transmission case 1 is displaced rightward or leftward via the second support shaft 24, the engagement rod 26 causes the position regulating plate 14 to move.
The configuration is such that the angle between the axle 21 and the transmission case 1 can be locked at the displacement position by selectively engaging with one of the recesses 14a formed at the curved end of the.

According to the present invention, the output shaft 32 of the engine 3 is mounted along the vertical axis, and the output shaft pulley 31 provided at the lower end is located in the transmission case 1. The engine 3 has a resin mounting plate 34 fixed to the lower surface of the engine body.
4 is superposed and mounted on a 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 on the engine output shaft 32.
The mounting plate 34 is rotatably overlapped with the mounting plate 15 with the mounting shaft 33, which is offset to one side from the axis of the above, as a fulcrum. The output shaft pulley 31 is mounted so as to be movable in the front-rear direction in accordance with this rotation.

In order to rotate the engine 3, the operation wire 36 is attached to the engine body through the locking member 35.
Of one end (the end of the inner wire) is locked, and the other end of the operation wire 36 is fixed to the mounting plate 15.
The outer wire tip is inserted into the operation lever 45 provided near the grip portion of the steering handle 4, and the operator moves the operation lever 45 to operate the operation wire 3.
When the inner wire 6 is pulled, the engine 3 moves to the mounting shaft 3
When the output shaft pulley 31 is moved to the rear position by horizontally rotating about the fulcrum 3 and the inner wire of the operation wire 36 is returned, the spring 37 interposed between the support member 16 and the locking member 35 is moved. The spring force causes the engine 3 to return to the original front position.

In this case, according to the present invention, when the engine 3 is horizontally rotated to move the output shaft pulley 31 to the rear position, the output shaft pulley 31 and the rotary shaft pulley 5 of the reaper 5 are moved.
1, a tension action is generated in the transmission belt 13 wound around and the rotational power of the engine 3 is transmitted to the mowing section 5, and when it is returned to the front position, the tension action is canceled and the power generated by the transmission belt 13 is removed. Transmission is turned off.

As shown in FIGS. 6 and 7, the steering handle 4 has a lower half portion 41 and an upper half portion 42 in which the left and right handle members made of pipe material are located at intermediate positions in the longitudinal direction.
The lower half portion 41 has horizontal portions 41a and 41b formed by bending the left and right handle members independently at their lower end portions.
(1) The left and right handle members of the lower half portion 41 are independently attached to the transmission case 1 by fitting them into the concave grooves 17 formed on both side peripheral portions and connecting the both by fastening bolts on the peripheral portions. There is. 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 portion 42a is provided between the handle members of the left and right lower half portions 41 which are independent from each other by a bolt 44 at the end portion. Removably coupled with its U-shaped end 42
a has a configuration in which it is bridged between the left and right handle members so as to bridge.

Further, in the case of the illustrated embodiment, the reaping unit 5 is a cord blade type reaping 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 and. The cover 55 is connected to the peripheral portion of the transmission case 1 with bolts. 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 a front end opening of the intake duct 38 is rearward along the steering handle 4. It is opened to the position to prevent dust and debris generated by cutting work from being sucked into the engine 3. Reference numeral 39 is a throttle lever provided near the grip portion of the steering handle 4.

Next, an example of use and operation of the mower constructed as described above will be described. In the mower, the operator pushes the steering handle 4 from the rear position to move the transmission case 1 forward at a desired work location. During normal mowing work on a flat ground, the transmission case 1 supported by the left and right traveling wheels 2a and 2b is placed in a horizontal state, and the worker
The reaping work is carried out so that the reaping section 5 provided on the lower front side of the transmission case 1 with the steering handle 4 from the rear position is moved forward with the reaping surface of the thread blade 54 along the ground. .

During 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 shown in FIG.
As shown in FIG. 3, the cutting operation is performed such that the thread blade 54 is inclined to the right and the left, and the cutting surface by the thread blade 54 is moved forward with the cutting surface along the inclined ground (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. 4, and one of the traveling wheels 2a or 2b is displaced. 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 closer to the ridge,
In this state, mowing work is performed on the ridges so that the vehicle travels forward.

When the operation of the above-mentioned mowing work is started, the operation lever 45 provided near the grip portion of the steering handle 4 is moved to pull the operation wire 36. As a result, the engine 3 horizontally rotates and the output shaft pulley 31 moves to the rear position, and accordingly, the output shaft pulley 31 is wound between the output shaft pulley 31 of the engine 3 and the rotation shaft pulley 51 of the reaper 5. The tension is generated in the rotated transmission belt 13 and the engine 3
Is transmitted to the rotary shaft 52 of the mowing unit 5, the yarn blade 54 provided on the rotating body 53 rotates, and the mowing work is performed.

When the mowing work is completed or the work is interrupted, the lever 45 is moved to pull back the operation wire 36. As a result, the spring force of the spring 37 interposed between the support member 16 and the locking member 35 causes the engine 3
Returns to the original position, the power transmission by the transmission belt 13 is turned off, and the rotation of the yarn blade 54 is stopped.

[0026]

As described above, according to the mowing machine of the present invention, the engine is horizontally rotatably mounted by the operation portion provided on the steering handle, and the output shaft pulley for horizontally rotating the engine is provided. The power from the output shaft pulley of the engine to the rotary shaft pulley of the cutting unit is transmitted because the power is turned off when the engine moves to the rear position and the rotary power of the engine is transmitted to the cutting unit and the engine is returned to the original position. The transmission system can be configured without a clutch mechanism for connecting and disconnecting power transmission. As a result, not only clutch-related parts, which are relatively expensive to manufacture, can be omitted, but also the number of transmission system components is greatly reduced, the mechanism is simplified, and the manufacturing cost is greatly reduced and the weight is reduced. As a result, it is possible to obtain an effect that it is possible to provide a cheap and lightweight mower.

When carrying out the mowing work, the transmission case equipped with the engine is run while being supported by the left and right running wheels, which allows the worker to easily carry out the work because heavier loads of heavy weight are not required. Even with this, there is little fatigue and the grass cutting work can be performed lightly.

[Brief description of the 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]

 1 Transmission Case 11 Upper Case 12 Lower Case 13 Transmission Belt 14 Position Control 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 Section 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 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 (1)

(57) [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 the pulleys. In the above engine, the output shaft pulley is movably mounted in the front-rear direction with the mounting shaft deviated from the axis line of the output shaft extending in the vertical direction as a fulcrum of rotation, and the engine is horizontally rotated by the operation unit provided in the handle. When this is done, the output shaft pulley moves to the rear position and a tension action is generated on the transmission belt, the rotational power of the engine is transmitted to the mowing part, and when it is returned to the front position, power transmission is turned off. Wheel traveling mowers of which is characterized by comprising a structure that.