JP3383539B2 - Walking mower - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a mowing device in front of a mission case, mounts a rear wheel on a drive shaft equipped at the lower end of the mission case, and installs a front wheel in front of the mowing device. A walking-type mower.

[0002]

2. Description of the Related Art In a walk-behind mower as described above, a front wheel is arranged in front of the mowing device and a rear wheel is arranged behind the mowing device, so that the load of the mowing device is stored on the ground. It is possible to drive in a stable posture. By the way, conventionally, in the above-mentioned walk-behind mower, the front wheel is configured as a free wheel that functions as a gauge wheel for adjusting the ground height of the mowing device.

[0003]

However, for example, when a running path such as an agricultural road on which a walk-behind mower is run is divided by an irrigation canal or the like, first,
Lift one of the front wheels of the front and rear wheels to drive the other wheel only, and as one of the preceding wheels reaches the running path on the other side such as a waterway, Ground and lift the other wheel,
By allowing only one of the preceding wheels to travel, the walk-behind mower can be crossed over a waterway that divides the travel path, but in the above-mentioned conventional technology, the front wheels are simply idle wheels. Since it is not driven, in order to obtain propulsive force when driving with only this front wheel, pushing the rear wheel which is the drive wheel while pushing out the aircraft (when moving forward) or pulling (when moving backward) Was required, so it was quite labor intensive. Moreover, when driving only the front wheels, which are freewheels, in situations where weeds are overgrown on the roadway or when the roadway is severely undulating, push and pull the aircraft satisfactorily due to these resistances. Can no longer
There has been an inconvenience that it becomes very difficult to cross a waterway that divides a walkway with a walk-behind mower.

Therefore, in order to avoid the above-mentioned inconvenience, it is conceivable to configure the front wheels as drive wheels in the same manner as the rear wheels. For example, a system different from the transmission system for driving rear wheels may be used. When the front wheels are configured as drive wheels by providing a front wheel drive transmission system that extends from the output shaft of the engine or the input part of the transmission case to the support shaft of the front wheels, the front wheel drive transmission system and the rear wheel drive It is necessary to equip the front wheel with a reduction mechanism for the front wheels that synchronizes the front wheels with the rear wheels by reducing the speed with the same or approximately the same reduction ratio as the reduction mechanism for the rear wheels installed in the transmission system. It causes new inconveniences such as complication of. On the other hand, when the front wheels are configured as drive wheels by providing a front wheel drive transmission system that extends from the drive shaft on which the rear wheels, which are the final transmission shafts in the rear wheel drive transmission system, are mounted to the support shaft Since the reduction mechanism for the rear wheels, which is equipped in the transmission system for driving the rear wheels, can also be used as the reduction mechanism for the front wheels, the front wheels can be driven without causing inconveniences such as an increase in size of the airframe and a complicated structure. However, since the drive shaft for the rear wheels is installed in the lower part of the mission case, the transmission system for driving the front wheels from the drive shaft to the support shaft of the front wheels is considerably Since it is arranged at a low position substantially along the ground and easily comes into contact with the ground due to the inclination of the machine body or the unevenness of the ground, it is easy to cause a problem that the transmission system for driving the front wheels is damaged.

An object of the present invention is to provide a walk-behind mower capable of easily crossing a waterway or the like which divides a running road such as an agricultural road, in order to increase the size of the machine body, complicate the structure, or drive the front wheels. It is to be able to configure while avoiding the inconvenience that the transmission system is easily damaged.

[0006]

In order to achieve the above object, in the invention according to claim 1 of the present invention, a reaping device is provided in front of a mission case, and a drive provided at a lower end portion of the mission case. With a rear wheel attached to the shaft, in a walking type mower in which front wheels are provided in front of the mowing device, an input unit and a speed reducing mechanism for traveling are provided on the upper side of the mission case, and in the mission case, Between the reduction mechanism and the drive shaft, the drive shaft
A power take-off shaft for driving the front wheels is arranged above .

According to the first aspect of the present invention, the power take-off shaft for driving the front wheels is arranged between the traveling speed reducing mechanism disposed on the upper side of the mission case and the drive shaft mounted on the lower side of the mission case. Since the transmission system for driving the front wheels that extends from the power take-off shaft to the support shaft for the front wheels is provided, the power after deceleration in the reduction mechanism can be transmitted to the front wheels as well. In addition, the front wheels can also be configured as drive wheels. With this, for example, when a walk-behind mower is crossed over a waterway for irrigation that divides a road such as a farm road, either one of the front and rear wheels is lifted and the other wheel is used for traveling. Also, it becomes possible to sufficiently obtain the propulsive force for traveling the airframe by the driving force of the other wheel. In other words, when the front wheels are simply idle wheels, in order to obtain propulsive force when traveling with only the front wheels, an operation such as pushing out the aircraft while moving the rear wheels (when moving forward) or pulling (when moving backward) is performed. Although it becomes necessary and considerably laborious, in the invention according to claim 1, even if the vehicle is driven by only the front wheels, the front wheels are configured as drive wheels like the rear wheels. It is possible to obtain sufficient propulsive force to drive the aircraft, and this eliminates the need to perform operations to obtain propulsive force, such as pushing out or pulling the aircraft, thus reducing the effort required to drive with only the front wheels. It will be possible to reduce considerably. In addition, even if the state of the traveling path when traveling with only one wheel is a state in which weeds and the like are overgrown or a state where undulations are severe, by configuring the front wheels and rear wheels as drive wheels, It becomes possible to easily run the aircraft against overgrown weeds and the ups and downs of the road. In short, since the propulsive force for running the machine can be obtained sufficiently with either one of the front and rear wheels, the walking type mower can be divided into running paths such as farm roads with the effort of lifting one wheel. You will be able to easily cross waterways.

Further, according to the above construction, the power after deceleration in the speed reduction mechanism can be transmitted to the front wheels and the rear wheels. In other words, the speed reduction mechanism for traveling arranged on the upper side of the transmission case is used for the front wheels. Since it can also be used as a reduction mechanism for the rear wheels, for example, a transmission system for driving the front wheels from the output shaft of the engine or the input part of the transmission case to the support shaft of the front wheels, which has a different structure from the transmission system for driving the rear wheels. Unlike the case where the front wheels are provided as the drive wheels by providing them, it is not necessary to separately provide the reduction mechanism for the front wheels and the reduction mechanism for the rear wheels. That is, the front wheels as well as the rear wheels can be configured as the drive wheels without inconveniences such as an increase in the size of the airframe and a complicated structure.

Moreover, since the power take-off shaft for driving the front wheels is arranged higher than the drive shaft for the rear wheels, for example,
Compared to the case where the front wheels are configured as drive wheels by providing a front wheel drive transmission system that extends from the drive shaft under the transmission case, which is the final transmission shaft in the rear wheel drive transmission system, to the support shaft of the front wheels, front wheel drive It is possible to position the input side (mission case side) of the power transmission system for vehicles at a high position, and it is possible to suppress the front wheel drive transmission system from touching the ground or the like due to the inclination of the body or the unevenness of the ground. . In other words, it becomes possible to prevent the inconvenience that the transmission system for driving the front wheels is damaged due to contact with the ground or the like.

Therefore, a walk-behind mower capable of easily crossing a waterway that divides a running path such as an agricultural road is provided.
It has become possible to construct while avoiding inconveniences such as an increase in the size of the machine body, a complicated structure, and a damage to the transmission system for driving the front wheels.

According to the second aspect of the present invention,
In the invention according to claim 1, the final transmission shaft of the reduction mechanism and the drive shaft are interlockingly connected by a chain, and a sprocket connected to the power take-off shaft is meshed in a winding path of the chain.

According to the second aspect of the invention, since the final transmission shaft of the reduction gear mechanism and the drive shaft are interlockingly connected by a chain, the final transmission shaft of the reduction gear mechanism and the drive shaft can be improved by making the chain longer. The distance from the shaft can be increased, and the power take-off shaft to which the input side of the transmission system for driving the front wheels is connected can be arranged at a higher position, so that the transmission system for driving the front wheels can be more effectively operated. It is possible to suppress the contact of the robot with the ground due to the inclination of the body or the unevenness of the ground.

By the way, in the case where the final transmission shaft of the reduction mechanism and the drive shaft are linked by gears, in order to increase the separation distance between the final transmission shaft of the reduction mechanism and the drive shaft, the final transmission shaft and the drive shaft are increased. Since it is necessary to add gears to be interposed between the gears and a structure for supporting the additional gears, it is necessary to increase the distance between the final transmission shaft and the drive shaft. This leads to an inconvenience that the number of parts increases and the structure becomes complicated.

Therefore, while simplifying the transmission structure, it is possible to more effectively avoid the inconvenience that the transmission system for driving the front wheels is damaged by contact with the ground or the like.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire side surface of a walk-behind mower, and FIG. 2 shows the overall plane of a walk-behind mower for two-sided mowing. This mower is a walk-behind type. The road surface mowing device 2 for mowing grass grown on the road surface is connected to the front part of the traveled vehicle body 1, and the left side end of the road surface mowing device 2 is connected to the sloped surface that is connected to one side end of the road surface. It is configured for two-sided cutting by connecting the slope cutting device 3 for cutting the grown grass.

As shown in FIGS. 1 and 2, the traveling body 1
Is a substantially L-shaped side body frame 4 and a side body frame 4
5, the engine 5 mounted on the vehicle, the mission case 6 standing upright behind the fuselage frame 4, the output shaft 5 of the engine 5.
a, a belt-type transmission mechanism 7 that is installed over the input shaft 6a as an input unit that is provided on the upper side of the mission case 6, a rear wheel 8 that is provided on the lower left side of the mission case 6, and a fuselage. The steering handle 9 is extended from the frame 4 toward the rear, and the like. still,
A front wheel 10 is provided in front of the road surface mowing device 2,
The load of the road surface mowing device 2 can be run in a stable posture with the load kept on the ground. Further, an auxiliary wheel 11 is provided in front of the slope harvesting device 3 so that the load of the slope harvesting device 3 can be run in a stable posture with the load kept on the ground. Steering wheel 9
Is a connection fulcrum P facing left and right on the upper rear end of the body frame 4.
It is swingably connected around 1, and the height position of the extension end can be changed to a height position according to the height of the worker by swinging operation in the vertical direction, thereby improving workability. In addition, by swinging forward to change the posture to the forward tilted position, the overall length of the machine can be shortened to about half that during use, which is advantageous in terms of transportation and storage. ing. In addition, the steering wheel 9
Is configured so that it can be fixed to the machine body frame 4 by tightening the bolt 12 with knob, and the height adjusting operation and the posture changing operation thereof can be easily performed without using a tool.

As shown in FIGS. 1 to 9, a road surface mowing device 2
Is a housing 13 extending horizontally from the front of the machine body frame 4 toward the front, and a single rotary blade 14 rotatably mounted in the housing 13 about a vertically oriented drive shaft core P2. Etc. The housing 13 is composed of a sheet metal top plate 13A fixed to the front part of the machine body frame 4 and a rubber plate 13B connected to the top plate 13A so as to form a right wall portion and a rear wall portion. There is. The slope harvesting device 3 is equipped with a housing 15 connected to the left end of the road harvesting device 2 so as to be vertically swingable around a front-rear axis P3, and rotatably within the housing 15 around a drive axis P4. The first mowing portion 3A including the one rotating blade 16 that is formed, the housing 17 that is swingably connected back and forth around the drive shaft core P4 of the first mowing portion 3A, and the housing 17 is provided side by side in the housing 17. The second cutting section 3B is composed of two rotary blades 18 and 19 that are rotatably mounted around the drive shaft cores P5 and P6. First reaper 3A
The housing 15 is composed of a top plate 15A made of sheet metal. The housing 17 of the second reaper 3B forms a top plate 17A made of sheet metal and a left wall portion and a rear wall portion in a state where the second reaper 3B is located on the left side of the first reaper 3A. And a rubber plate 17B connected to the top plate 17A. That is, the slope cutting device 3 is connected to the left end of the road cutting device 2 so as to be vertically swingable around the front-rear axis P3, and by this vertical swing, its posture is changed. 3 can be changed to a posture along the work surface for performing the mowing work. In addition, the slope harvesting device 3 includes the second harvesting unit 3 with respect to the first harvesting unit 3A.
B is configured to be swingable back and forth around the drive shaft core P4, and by the swinging operation of the second cutting section 3B back and forth,
The cutting width can be changed to a length according to the length of the work surface on which the slope cutting device 3 performs the cutting work.

The front-back swing range of the second mowing section 3B is set to the first left-hand side of the first mowing section 3A, which is in a state of being aligned with the first mowing section 3A along the left-right direction of the body. It is set in a range extending immediately after the first mowing section 3A, which is in a state of being aligned on the straight line along the longitudinal direction of the first mowing section 3A and the second mowing section 3B. The cutting width of the slope cutting device 3 can be maximized by arranging it on the left side, and the slope cutting device 3 can be arranged by positioning the second cutting portion 3B immediately behind the first cutting portion 3A. The cutting width of can be minimized. The maximum mowing width length of the slope cutting device 3 is the sum of the mowing width length of the first mowing unit 3A and the maximum mowing width length of the second mowing unit 3B. Moreover, the minimum mowing width length of the slope mowing device 3 is only the mowing width length of the first mowing section 3A.

As shown in FIGS. 3 to 7, the road surface mowing device 2
The rotary blades 14 and the rotary blades 16, 18, and 19 of the slope harvesting device 3 are closely arranged so that adjacent ones are in a state where a part of each cutting region (rotation locus) overlaps with each other, Each of them is set to rotate in a rotation phase that can avoid contact between adjacent objects. Moreover, when changing the mowing width of the slope cutting device 3 as described above, the second mowing portion 3B is rocked back and forth around the drive shaft core P4 of the rotary blade 16 of the first mowing portion 3A. The distance between the rotary blades 14, 16, 18, and 19 can be kept constant regardless of the cutting width of the slope cutting device 3. That is, at the time of the mowing work, regardless of the change in the mowing width of the slope cutting device 3, between the road cutting device 2 and the slope cutting device 3 and the first cutting portion 3A of the slope cutting device 3 and the first cutting unit 3A. Two reaper 3B
And between the rotary blades 18 of the second reaper 3B,
It is configured so as to avoid inconveniences such as uncut residue occurring between 19 and contact between adjacent ones of the rotary blades 14, 16, 18, and 19.

As shown in FIGS. 1 to 9, a road surface mowing device 2
And the first mowing section 3A of the mowing device 3 for slopes are the drive shafts 14a, 16 of the rotary blades 14, 16 respectively equipped.
The parts a are interlockingly connected by the first transmission mechanism 20. The first transmission mechanism 20 includes the drive shaft 1 of the road surface mowing device 2.
4a, a bevel gear-type first gear transmission portion 20A, which is transmission-coupled to 4a, a bevel-gear-type second gear transmission portion 20B, which is transmission-coupled to the drive shaft 16a of the first reaping portion 3A, and is configured to be expandable and contractible. The shaft transmission portion 20C and a universal joint 20D that couples the respective gear transmission portions 20A and 20B to the shaft transmission portion 20C so as to be transmittable are configured to be bendable and extendable, and the road surface around the front-rear axis core P3. The vertical cutting of the slope cutting device 3 with respect to the cutting device 2 is allowed. The drive shafts 18a and 19a of the rotary blades 18 and 19 mounted on the second cutting section 3B of the slope cutting device 3 are interlocked with the end of the first transmission mechanism 20 on the slope cutting device 3 side. The 2nd transmission mechanism 21 connected is connected so that transmission is possible. The second transmission mechanism 21 includes a bevel gear-type first gear transmission portion 21A that is connected to the second gear transmission portion 20B of the first transmission mechanism 20 so as to be capable of transmission, and the rotary blade 18 on the side adjacent to the first cutting portion 3A. Drive shaft 18a
Bevel gear-type second gear transmission portion 21B that is transmission-coupled to the first bevel gear-type third gear transmission portion 21C that is transmission-coupled to the drive shaft 19a of the rotary blade 19 that is separated from the first cutting portion 3A. , And a shaft transmission portion 21D that couples the respective gear transmission portions 21A, 21B, and 21C so as to be able to transmit the drive shaft core P4 with the second cutting portion 3B.
It is configured to be able to swing back and forth integrally around. The first gear transmission portion 20A of the first transmission mechanism 20 is equipped with an input shaft 20a, and a belt tension type reaping clutch 22 is provided over the input shaft 20a and the output shaft 5a of the engine 5. .

That is, in the road surface mowing device 2, the rotary blade 14 is driven by the power from the engine 5 transmitted through the mowing clutch 22 and the first transmission mechanism 20. Further, the slope harvesting device 3 changes its posture by vertically swinging about the front-rear axis P3, and
From the engine 5 transmitted via the mowing clutch 22, the first transmission mechanism 20, and the second transmission mechanism 21 regardless of the cutting width change due to the back-and-forth swinging of the second mowing section 3B around the drive shaft core P4. The rotating blades 16, 18, and 19 are driven by the power of.

As shown in FIGS. 1 to 5, 17 and 18, the slope harvesting device 3 is provided with a first operating lever erected on the left handlebar 9A of the steering handle 9 so as to be swingable back and forth. 23, an operation arm 24 supported by the first gear transmission portion 20A of the first transmission mechanism 20 so as to be swingable left and right, a release wire 25 extending from the first operation lever 23 to the operation arm 24, and an operation arm 24 One reaper 3A
The second gear transmission portion 20B of the first transmission mechanism 20 fixed to the housing 15 is linked via the operation rod 26 and the like. The first operation lever 23 can be held at a desired operation position by engaging with a guide plate 27 attached to the left handle rod 9A. In other words, by swinging the first operation lever 23 to the rear side against the weight of the slope cutting device 3, the slope cutting device 3 can be swung up and down around the front-rear axis P3, and By swinging the first operating lever 23 to the front side, the slope harvesting device 3 can be swung down around the front-rear axis P3 by its own weight. Further, by engaging the first operation lever 23 with the guide plate 27 at a desired operation position, the slope cutting device 3 is moved to the front-rear axis P.
It can be held in a desired posture around the three positions.
A gas cylinder 28 for assisting is installed from the housing 13 of the road surface mowing device 2 to the operation arm 24 so as to reduce the operation force when the slope cutting device 3 is swung upward by the first operation lever 23. Due to the action of the gas cylinder 28, the raising and swinging operation of the slope cutting device 3 by the first operating lever 23 can be performed with a light operation.

As shown in FIGS. 1 to 5 and 19, the second mowing section 3B of the slope mowing device 3 swings back and forth integrally with the second mowing section 3B around the drive axis P4 of the first mowing section 3A. The moving second transmission mechanism 21 is linked via a push-pull wire 30 to a second operation lever 29 that is erected on the right handlebar 9B of the steering handle 9 so as to be swingable back and forth. In other words, the second reaping section 3B is moved to the drive shaft center P4 of the first reaping section 3A by swinging the second operating lever 29 back and forth.
It can be swung back and forth around, and thus the cutting width of the slope cutting device 3 can be changed. The second operation lever 29 is swingably supported by the shaft transmission portion 21D of the second transmission mechanism 21 with respect to the fan-shaped engaged plate 31 fixed to the second gear transmission portion 20B of the first transmission mechanism 20. An operating rod 33 for releasing the engagement of the engagement arm 32 is fitted inside. The operating rod 33 and the engaging arm 32 are pivotally connected to the lower end of the operating rod 33 and are supported by the second operating lever 29 so as to be swingable back and forth, and from the crank arm 34 to the engaging arm 32. Release wire 3
5 are linked together. The operating rod 33 is urged by an extension spring 36 extending from the second operating lever 29 to the crank arm 34 so as to project from the upper portion of the second operating lever 29. The engagement arm 32 is biased by a spiral spring 37 so as to engage with the engaged plate 31. That is, the engagement of the engaging arm 32 with the engaged plate 31 can be released by pushing the operating rod 33 against the tension spring 36 and the spiral spring 37, and in this state, The operation lever 29 can be used to perform a back-and-forth swinging operation of the second mowing section 3B. Further, by releasing the pushing operation of the operating rod 33, the engaging arm 32 can be engaged with the engaged plate 31 by the urging of the spiral spring 37, so that the second cutting section 3B is driven by the drive shaft core. It can be held in a desired posture around P4.

As shown in FIGS. 1 and 17, the reaping clutch 22 is linked to the left handlebar 9A of the steering handle 9 via a reaping clutch lever 38, which is vertically swingably operable, and a release wire 39. And
It is configured as a deadman method in which the left handlebar 9A and the reaping clutch lever 38 are squeezed together to swing the reaping clutch lever 38 upward to switch to the transmission state.

As shown in FIGS. 2-4, 6 and 7.
At the rear end of the first mowing section 3A in the slope mowing device 3,
A rear wall body 40 is provided that prevents rearward cutting of cut grass and the like cut by the first cutting unit 3A. Rear wall 4
Reference numeral 0 denotes a rubber plate 40A that forms a rear wall portion and a support member 40B that supports the rubber plate 40A. The housing 13 of the road surface mowing device 2 is a fulcrum on the road surface mowing device 2 side. Of the second cutting portion 3B while being connected so as to be swingable back and forth around a vertical axis P7 set at the left rear end of the same and vertically swingable around a horizontal axis P8.
Are linked to each other via a link 41. The horizontal axis P8 is
When the second mowing section 3B of the slope harvesting device 3 is located on the immediate left side of the first mowing section 3A, the second mowing section 3B is located on an extension of the front-rear axis P3. That is, the rear wall 40
Is swinging back and forth around the vertical axis P7 in conjunction with the forward and backward swinging operation of the second cutting section 3B around the drive axis P4,
It is configured to swing up and down around the horizontal axis P8 in conjunction with the vertical swinging operation of the slope cutting device 3 around the front and rear axis P3, whereby the second cutting section 3B is first cut. Part 3
Regardless of changing the mowing width of the slope cutting device 3 that swings back and forth around the drive shaft core P4 of A, and changing the attitude of the slope cutting device 3 around the front and rear shaft core P3, the first cutting portion 3A Although it is possible to prevent the cutting grass from being scattered from the rear to the rear and is arranged at the rear end of the first mowing section 3A,
An obstacle is prevented when the cutting width of the slope cutting device 3 for swinging the second cutting part 3B back and forth around the drive shaft core P4 of the first cutting part 3A is changed.

As shown in FIGS. 3 to 5, when changing the cutting width of the slope cutting device 3 for swinging the second cutting part 3B back and forth around the drive shaft core P4 of the first cutting part 3A, the cutting width is changed. Since the housing 15 of the first mowing portion 3A and the housing 17 of the second mowing portion 3B may be separated from each other due to the operation to form a gap, the cover 42 for filling the gap is used as the second mowing portion. First cutting section 3A in housing 17 of section 3B
It extends from the side end toward the first mowing section 3A.
That is, since the cover 42 is provided at the end of the housing 17 of the second mowing unit 3B on the side of the first mowing unit 3A, the mowing width of the slope mowing device 3 is changed during the mowing operation to change the mowing device 3 for the slope. It is possible to prevent the cut grass from scattering from the gap formed between the housings 15 and 17 of the above. It should be noted that the housing 1 of the first reaper 3A
A pressing plate 43 for preventing the cover 42 from being lifted from the upper surface of the first mowing section 3A is provided on the upper surface portion of the second mowing section 3B side of the first mowing section 3A. It is possible to prevent the cut grass from scattering from between the upper surface of the cover and the cover 42.

As shown in FIGS. 7 and 20, the slope cutting device 3 has the free end of the second cutting portion 3B in the minimum cutting width state in which the free end of the second cutting portion 3B is located at the rearmost position. Is the rear wheel 8
It is set so as to be located near the rear end, and the front side of the machine body can be greatly floated with the support shaft 8a of the rear wheel 8 as a fulcrum. That is, for example, when it is necessary to get over the step portion while traveling in a state where the free end of the second mowing unit 3B is located at the rearmost position and the lateral width of the machine body is minimized, the second mowing unit 3B In the case where the free end is set to be located rearward of the rear end of the rear wheel 8, even if an attempt is made to levitate the front side of the machine body by using the axle 8a of the rear wheel 8 as a fulcrum, Since the front end side of the airframe cannot be greatly levitated by the contact of the free end with the road surface, there is a disadvantage that the step portion cannot be easily overcome. Since the free end of the reaper 3B is set near the rear end of the rear wheel 8, as shown in FIG. 20, the front side of the machine body is set with the support shaft 8a of the rear wheel 8 as the fulcrum. It is possible to make a large levitate and easily climb over a step. So that the can be.

As shown in FIGS. 6 and 7, the road surface cutting device 2 is constructed so that the rotary blade 14 rotates counterclockwise in plan view. The slope harvesting device 3 is configured such that the rotary blade 18 on the side of the first harvester 3A in the second harvester 3B rotates counterclockwise in plan view and the other rotary blades 16 and 19 rotate clockwise in plan view. Has been done. With this configuration, the rotary blade 14 of the road surface mowing device 2 and the rotary blade 16 of the first mowing unit 3A of the slope cutting device 3 are used.
By the action of the rotary blades 14 and 16, the cut grass that has been cut by can be guided between the rotary blades 14 and 16, and can be smoothly discharged backward between the rotary blades 14 and 16. , Rotary blades 18, 19 of the second mowing section 3B of the mowing device 3 for slope
By the action of the rotary blades 18 and 19, the cut grass cut by can be guided between the rotary blades 18 and 19, and can be smoothly discharged rearward from between the rotary blades 18 and 19. Has become.
That is, when the rotary blade 14 of the road surface mowing device 2 is configured to rotate clockwise in plan view, the grass cut by the rotary blade 14 is the housing 13 and the rotary blade 14 of the road surface mowing device 2. In the case where the rotary blade 19 on the free end side of the second mowing section 3B of the slope cutting device 3 is rotated counterclockwise in plan view, inconvenience of being accumulated between the second mowing device and the traveling device. Caused by the rotary blade 19 accumulated on the rotary blade 19 between the housing 17 of the second reaper 3B and the rotary blade 19, which may hinder the reaping and traveling. Blades 14,1
Rotating blades 14, 16, 18, 19 that occur when 6, 18, 19 are configured to rotate in the same direction.
It is excellent in terms of cutting performance and running performance, in which it is possible to avoid inconveniences, such as the cutting grass being cut off by being accumulated without being discharged from between them and impeding cutting or running.

As shown in FIGS. 2, 6 and 7, the rear wheel 8 is mounted on the drive shaft 8a extending from the lower portion of the mission case 6 which is the support shaft 8a thereof toward the left outer side. It is composed of a pair of rubber tires 8A, and is driven by the power from the engine 5 transmitted via the mission case 6. As shown in FIGS. 15 and 16, on the upper side of the mission case 6,
A deceleration mechanism A for traveling, which is drivingly connected to the input shaft 6a, is provided. The deceleration mechanism A includes a transmission unit Aa capable of decelerating by switching the power from the engine 5 between high and low stages.
And a clutch portion Ab for intermittently transmitting the transmission from the engine 5 to the rear wheel 8. Specifically, the speed reduction mechanism A
Is a first high speed gear 44, a first low speed gear 45, a second high speed gear 46 that meshes with the first high speed gear 44, and a second high speed gear 45 that meshes with the first low speed gear 45. The low speed gear 47, the second high speed gear 46 and the second low speed gear 47 are integrally rotatably supported on the transmission shaft 48 disposed below the input shaft 6a, and the first relay gear 48a integrally formed on the transmission shaft 48. A second relay gear 49 fitted to the input shaft 6a so as to be rotatable relative to the input shaft 6a, and a second relay gear 49 fitted to the input shaft 6a so as to be rotatable relative to and slidably moved on the second relay gear 49 by a sliding operation. Engaged claw 49 formed integrally
shift gear 50 having a meshing claw 50a capable of meshing with a,
And a final gear 51 and the like externally fitted to the transmission shaft 48 so as to be relatively rotatable while meshing with the shift gear 50. Of these, a first high speed gear 44, a first low speed gear 45, and a second high speed gear The gear 46 and the second low speed gear 47 form a speed change unit Aa. In addition, the second relay gear 49 and the shift gear 50 cause the clutch portion A to
b is configured. An output sprocket 52 is integrally rotatably attached to the final gear 51 of the reduction mechanism A,
From this output sprocket 52, an input sprocket 53 integrally rotatably mounted on a drive shaft 8a for driving the rear wheels 8.
A chain 54 is wound over the entire length. That is,
With the above configuration, the power from the engine 5 is transmitted to the rear wheels 8 so that the power can be intermittently switched and can be switched between high and low stages.

As shown in FIGS. 1, 2 and 15, the shifting operation of the shifting portion Aa is performed by swinging the shifting lever 55 extending leftward from the upper left side of the transmission case 6 in the left-right direction. Thus, the shift shaft 56 with the key 56a, which is fitted in the input shaft 6a so as to be slidably movable, is slid to selectively engage the key 56a with the first high speed gear 44 or the first low speed gear 45. It can be done by doing things. In addition, as shown in FIGS. 1 and 16, the switching operation of the clutch portion Ab is linked to the shift gear 50 via the shift fork 57 and the release wire 58, and the right handlebar 9B of the steering handlebar 9B.
Running clutch lever 5 equipped with up and down swing operation
A spring (not shown) for operating the shift fork 57 in the transmission cutting direction by gripping 9 with the right handlebar 9B together.
It is configured as a deadman system in which the transmission state is switched by swinging upward against the urging force of.

As shown in FIGS. 1 to 4, 15 and 16, the front wheel 10 is a power take-off shaft arranged between the speed reduction mechanism A of the transmission case 6 and the drive shaft 8a for driving the rear wheel 8. 6b includes a first chain type transmission mechanism 61 extending from the power take-off shaft 6b to a relay shaft 60 provided in the front portion of the housing 13 of the road surface cutting device 2, and a first chain type transmission mechanism 61 extending from the relay shaft 60 to the support shaft 10a of the front wheel 10. Two chain type transmission mechanism 62
It is connected to be transmitted by and. Power take-off shaft 6b
Is a transmission shaft 48 which is a final transmission shaft in the reduction mechanism A.
A chain 54 wound around an output sprocket 52 mounted on the drive shaft 8a and an input sprocket 53 mounted on the drive shaft 8a is integrally and rotatably connected with a sprocket 6c meshing in the winding path. That is, the front wheels 10 are driven by the power from the engine 5 transmitted through the belt type transmission mechanism 7, the transmission case 6, the first chain type transmission mechanism 61, and the second chain type transmission mechanism 62. Has become. Also,
By disposing the power take-off shaft 6b for driving the front wheels 10 above the drive shaft 8a for driving the rear wheels 8, the front wheels 1
It is possible to prevent the transmission system for 0 drive from coming into contact with the ground or the like and being damaged by the inclination of the body or the unevenness of the ground.

As shown in FIGS. 1 to 4 and 12 to 14, the second chain type transmission mechanism 62 includes the road surface cutting device 2
The left and right support brackets 63 provided upright on the housing 13 extend forward while being supported in a vertically swingable manner, and the front wheels 10 are attached to the extended ends thereof. There is. That is, the second chain type transmission mechanism 62
The height position of the front wheel 10 with respect to the road surface mowing device 2 can be changed by the vertical swinging operation of, and the cutting height by the road surface mowing device 2 can be changed. In addition, the second chain type transmission mechanism 62 has a plurality of (five in this embodiment as shown in FIG. 14) expansions on the left side support bracket 63 by tightening the knob bolt 64 having the expanded diameter portion 64a. Long hole 6 formed to have a diameter portion 65a
By engaging with any one of the enlarged diameter portions 65a of No. 5, it is possible to fix the swinging posture to a desired swing posture without using a tool, whereby the cutting height changing operation of the road surface cutting device 2 can be performed. It can be done easily.

As shown in FIGS. 2 to 4, 10 and 11, the auxiliary wheel 11 has a support arm 66 extending forward from the second gear transmission portion 20B of the first transmission mechanism 20, and The height position with respect to the slope harvesting device 3 can be changed in front of the first harvesting portion 3A of the slope harvesting device 3 via a support rod 67 extending vertically from the support arm 66. It is arranged so that. That is, by disposing the auxiliary wheel 11 in front of the first mowing section 3A, the auxiliary wheel 11 can be mowed by the mowing device 3 for slope even when the mowing device 3 for slope is set to the minimum mowing width. Since it can be located within the width, even if the work area is narrow and needs to be steered with the slope cutting device 3 set to the minimum cutting width, the work area can be entered and Even at the work site, it is possible to steer the load of the slope harvesting device 3 in a stable posture with the load kept on the ground, thereby improving stability during running and workability. Further, by changing the height position of the auxiliary wheel 11 with respect to the slope cutting device 3, the cutting height by the slope cutting device 3 can be changed. At the rear end of the support rod 67, a plurality of (in the present embodiment, FIG.
As shown in FIG. 0, five connecting holes 68a are attached to the connecting plate 68, and the supporting rod 67 has the connecting holes 6a.
By inserting the connecting pin 66a equipped on the support arm 66 into any of the 8a, it can be fixed in a desired swing posture without using a tool. With this configuration, the cutting height changing operation of the slope cutting device 3 can be easily performed.

As shown in FIGS. 3, 4 and 8 to 11, the support rod 67 is rotatably supported by the connecting plate 68 around its axis P9 and is fixed to the rear portion thereof. 67 a is the housing 13 of the road surface mowing device 2.
It is pivotally connected to a free end of a swing arm 70 which is swingably connected to a front and rear axis P10 on a fixed plate 69 which is vertically installed. From this configuration, the auxiliary wheel 1 mounted on the support rod 67
1 is adapted to rotate around the axis P9 of the support rod 67 in conjunction with a vertical swing operation around the front-rear axis P3 of the slope harvesting device 3, and by this rotation, the slope surface 1 The posture with respect to the harvesting device 3 is changed so as to be maintained in a substantially vertical posture. That is, since the auxiliary wheel 11 is maintained in the substantially vertical posture regardless of the inclination angle of the slope cutting device 3, the auxiliary wheel 11 easily receives the load of the slope cutting device 3, and the load applied to the auxiliary wheel 11 is thereby increased. Since the biting force with respect to the inclined surface obtained by the method becomes large, skid hardly occurs on the inclined surface. As shown in FIGS. 8 and 9, the connecting position of the swing arm 70 to the fixed plate 69 of the road surface mowing device 2 can be changed, and the posture of the auxiliary wheel 11 can be changed by changing the connecting position. Can be changed.

[Other Embodiments] Other embodiments of the present invention will be listed below. Various modifications can be made to the configurations of the mowing devices 2 and 3 mounted on the walk-behind mower. For example, it may be configured to include only the road surface mowing device 2, and
The pair of upper and lower blades may be laterally reciprocally slid relative to each other to perform cutting. The deceleration mechanism A includes a transmission unit Aa and a clutch unit Ab.
It may have a configuration not equipped with. The final transmission shaft 48 of the reduction gear mechanism A, the drive shaft 8a, and the power take-off shaft 6b may be interlocked by a gear or a belt.

[Brief description of drawings]

[Figure 1] Overall side view of a walk-behind mower

[Fig. 2] Overall plan view of a walk-behind mower

FIG. 3 is a plan view of the mowing unit in a state in which the slope mowing device showing the support structure for the front wheels and the auxiliary wheels and the configuration of each mowing device is set to the maximum mowing width.

FIG. 4 is a plan view of a mowing unit in a state where the slope mowing device showing the support structure for the front wheels and the auxiliary wheels and the configuration of each mowing device is set to the minimum mowing width.

FIG. 5 is a vertical sectional front view showing the configuration of each reaping device.

FIG. 6 is a schematic plan view of a walk-behind mower showing a state in which front wheels and auxiliary wheels are arranged and a slope cutting device is set to a maximum cutting width.

FIG. 7 is a schematic plan view of a walk-behind mower showing a state in which front wheels and auxiliary wheels are arranged and a slope cutting device is set to a minimum cutting width.

FIG. 8 is a front view of the mowing section showing a state in which the auxiliary wheel support structure and the slope mowing device are set in a horizontal posture.

FIG. 9 is a front view of the mowing section showing a state in which the auxiliary wheel support structure and the slope mowing device are set in an inclined posture.

FIG. 10 is a vertical sectional side view of a slope harvesting device showing a support structure for an auxiliary wheel.

FIG. 11 is a vertical cross-sectional plan view of essential parts showing a support structure for an auxiliary wheel.

FIG. 12 is a side view of a main part showing a front wheel support structure.

FIG. 13 is a cross-sectional plan view of essential parts showing a front wheel height adjusting structure.

FIG. 14 is a side view of an essential part showing a front wheel height adjusting structure.

FIG. 15 is a vertical sectional front view showing a transmission structure in a mission case.

FIG. 16 is a vertical sectional side view showing the transmission structure in the mission case.

FIG. 17 is a side view of a main portion showing a configuration of an operation lever portion for vertically swinging the slope harvesting device.

FIG. 18 is a plan view of a main portion showing the configuration of an operation lever portion for vertically swinging the slope harvesting device.

FIG. 19 is a side view of a main portion showing the configuration of an operation lever portion for changing the cutting width of the slope cutting device.

FIG. 20 is a schematic side view of a walk-behind mower showing a state of riding on a step portion.

[Explanation of symbols]

2 reaper 3 reaper 6 mission case 6a Input section 6b Power output shaft 6c sprocket 8 rear wheels 8a drive shaft 10 front wheels 48 Final transmission shaft 54 chains A reduction mechanism

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-322360 (JP, A) Actual Open 59-91921 (JP, U) Actual Open Flat 5-2601 (JP, U) Actual Open 5- 76202 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01D 34/68 A01D 34/86

Claims (2)

(57) [Claims] 1. A walk-type mowing machine in which a mowing device is provided in front of the mission case, rear wheels are attached to a drive shaft equipped at a lower end portion of the mission case, and front wheels are provided in front of the mowing device. In the machine, an input section and a speed reducing mechanism for traveling are provided on the upper side of the mission case, and between the speed reducing mechanism and the drive shaft in the mission case , the front side above the drive shaft. A walk-behind mower with a power take-off shaft for wheel drive. 2. The final transmission shaft of the reduction mechanism and the drive shaft are interlockingly connected by a chain, and a sprocket connected to the power take-off shaft is meshed with a chain winding path. Walk-behind mower.