JP3418341B2 - Riding 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 riding mower in which a mower is movably connected to a front portion of a traveling machine body through an elevating link mechanism.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned riding-type mower, the mower cutting blade is rotationally activated in association with the lowering operation of the mower which operates the operating lever for raising and lowering the mower from the neutral position to the lowering operation position. Some were configured to be.

[0003]

However, according to the above-mentioned conventional technique, the cutting blade is rotationally activated by a simple operation from the neutral position of the operating lever to the lowering operation position. If the operation lever is accidentally operated from the neutral position to the lowering operation position by touching a part of the operation lever, and the erroneous operation causes the cutting blade of the mower to be unexpectedly rotated and activated. Was happening.

An object of the present invention is to avoid the inconvenience that the cutting blade of the mower is unexpectedly rotated and activated by an erroneous operation of the operating lever such as a part of the body unintentionally touching the operating lever. is there.

[0005]

In order to achieve the above object, in the invention according to claim 1 of the present invention, a mower is connected to a front portion of a traveling machine body via a lifting link mechanism so as to be lifted and lowered. In the riding-type mower, the operation lever for moving up and down the mower is configured to be a composite operation type and is also used for driving the cutting blade, and the operation of the operation lever in the cutting blade driving operation direction and the operation direction thereafter. The cutting blade of the mower is rotationally activated based on a two-step operation of moving the operation lever to the lowering operation position in a different mower lifting operation direction.

[Operation] According to the invention described in claim 1, when the cutting blade of the mower is rotationally activated, the operation lever is first operated in the cutting blade drive operation direction, and after that operation, the operation direction is changed. It is necessary to intentionally perform a two-step operation of the operation lever, such as operating the mower in different raising / lowering operation directions to position it in the lowering operation position. In other words, the cutting blade of the mower is rotated and activated by a two-step operation in which the operating direction of the single operating lever is different, which is difficult to perform by mistaken operation such as touching the operating lever unintentionally. In addition, it is possible to avoid the inconvenience that the cutting blade of the mower is unexpectedly activated by a part of the body touching the operation lever.

[Effect] Therefore, it has become possible to avoid the disadvantage that the cutting blade of the mower is unexpectedly rotated and activated by an erroneous operation of the operation lever such as a part of the body unintentionally touching the operation lever.

According to the second aspect of the present invention,
In the invention according to claim 1, only when the operation lever is operated to the lowering operation position within a predetermined time after the operation lever is operated in the cutting blade drive operation direction, the mower cutting blade is operated. Is configured to be activated by rotation.

[Operation] According to the invention described in claim 2, when the cutting blade of the mower is rotationally activated, the operation lever is first operated in the cutting blade drive operation direction, and within a predetermined time from the operation, It is necessary to intentionally perform a time-limited two-step operation of the operating lever, such as operating the mower in a raising / lowering operating direction different from the operating direction to position the mower in the lowering operating position. In other words, the cutting blade of the mower is rotationally activated by performing the two-step operation in which the operation direction of the single operation lever with different operation directions is difficult to perform by mistaken operation such as unintentionally touching the operation lever with the body. As a result, it becomes possible to more reliably avoid the inconvenience that the cutting blade of the mower is unexpectedly rotated and activated by unintentionally touching a part of the body with the operating lever.

[Effect] Therefore, it is possible to more surely avoid the inconvenience that the cutting blade of the mower is unexpectedly rotated and activated by an erroneous operation of the operation lever such as a part of the body unintentionally touching the operation lever. It was

[0011]

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 riding mower of the reel mower type which is an example of a riding mower.
This mower has three reel mowers 2 on the front part of the traveling body 1.
Is connected so that it can be moved up and down, and at the rear of the traveling machine body 1,
Constituting a grass collecting container 4 for collecting the grass cut by each reel mower 2 through a grass collecting duct 3 so that the grass can be switched between a grass collecting position (see FIG. 1) and a discharging position (see FIG. 2). Has been done.

As shown in FIGS. 1 to 4, the traveling machine body 1 includes a water-cooled engine 6 mounted on the rear portion of the machine body frame 5,
A cooling fan 7 connected to the front part of the engine 6, a radiator 8 arranged in front of the cooling fan 7, an oil cooler 9 arranged in front of the radiator 8, an engine hood 10 covering them, and a drive type. A pair of left and right front wheels 11 and rear wheels 12, a steering wheel 13 linked to the rear wheels 12, a driver seat 14 disposed between the steering wheel 13 and the grass container 4, and a driver seat 14 on the body frame 5. It is configured by a loop-shaped protection frame 15 and the like, which are erected at the rear portion.

As shown in FIGS. 3 to 5, the oil cooler 9
Has a double cooling structure in which the cooling pipelines formed in a meandering shape are provided in the front and rear two rows, and the cooling pipelines in the front and rear two rows are displaced so as not to overlap in the blowing direction. Therefore, the oil cooling efficiency can be improved. Radiator 8 and engine bonnet 1
A shield plate 16 that blocks the flow of engine cooling exhaust air to the oil cooler 9 side is provided between 0 and 0, and a flat plate shape made of a filter material such as synthetic resin fiber is provided on the front surface of the radiator 8. The dustproof net 17 is attached to the radiator 8 so as to be detachable by the sliding movement in the vertical direction. In addition, on the front surface of the shielding plate 16, a box-shaped first dustproof body 18A made of a punching metal material having a plurality of ventilation holes and a box-shaped dustproof body 18A made of a filter material such as synthetic resin fiber are provided outside the dustproof body 18A. Second dustproof body 18B to be fitted
A dustproof box 18 that is configured to cover the oil cooler 9 from above when mounted is attached so as to be detachable by sliding movement in the vertical direction with respect to the shield plate 16. That is, by adopting the box-shaped and double-structured dustproof box 18 having a large filtration area, it is possible to prevent the deterioration of the cooling efficiency in the early stage due to the clogging while improving the dustproof effect. There is.

As shown in FIG. 3, the engine bonnet 10 is supported so as to be slidable forward and backward, and by sliding the engine bonnet 10 rearward, the radiator 8 of the dustproof net 17 and the dustproof box 18 or the shield plate. The work of attaching and detaching to and from 16 can be performed.

As shown in FIGS. 1 and 6 to 10, each reel mower 2 is extended from the front portion of the machine body frame 5 toward the front so as to be vertically swingable around a left-right axis P1. Of the rocking arms 19, the corresponding rocking arm 19 is supported at its free end so as to be able to roll around the longitudinal axis P2 and to yaw around the vertical axis P3. Along with the left and right center swing arm 19
The left and right reel mowers 2 supported by the left and right swing arms 19 partially overlap the cutting widths of the left and right reel mowers 2 behind the central reel mower 2 supported by the left and right swing mowers 19. It is arranged so as to be in a state of being. Each swing arm 19 is driven up and down by the operation of three hydraulic cylinders 20 linked to each swing arm. In other words, the swing arm 19 and the hydraulic cylinder 20 constitute the lifting link mechanism A. The left and right reel mowers 2 are rotated about the front-rear axis P2 by being brought into contact with the left and right rollers 21 supported on the machine body frame 5 by the inner ends of the upper portions of the reel mowers 2 as they rise above a predetermined height. It is possible to switch to a retracted posture in which each outer end side is displaced upward to the body side.

As shown in FIGS. 8, 11 and 12, in each reel mower 2, a reel blade 22 which is an example of a cutting blade formed in a spiral shape, and the reel blade 22 are rotatable about a left-right axis P4. A reel mower case 23 that is supported by the reel mower case 23, a fixed blade 24 that is fixedly mounted on the lower rear portion of the reel mower case 23 so as to contact the reel blade 22, a hydraulic motor 25 that drives the reel blade 22 in the forward and reverse directions, and the front and rear of the reel blade The grounding rollers 26, 27, etc. are installed in
The grass is mowed by the shearing action when the reel blade 22 is driven to rotate forward so as to be in contact with the fixed blade 24, and the grass is generated by the rotational force of the reel blade 22 and its rotation. The wind force allows the rear part and the upper part of the reel mower case 23 to pass therethrough, and guides the grass into the grass collection boot 28 interposed between the front upper part of the reel mower case 23 and the grass collection duct 3. The cut grass guided into the grass collecting boot 28 is collected in the grass collecting container 4 by the action of the suction blower 29 provided in the grass collecting duct 3. The suction blower 29 is driven by power from the engine 6 transmitted via a belt tension type clutch 30 and the like.

Each reel mower 2 is equipped with a bolt 31 with a knob for swinging the height position of the reel blade 22 around the axis P5 in the left-right direction. By operating the knob bolt 31, the fixed blade 24 is moved. It is possible to easily position the height position of the reel blade 22 with respect to the proper height position where a suitable shearing action is obtained. Further, in order to eliminate the deterioration of sharpness due to burrs due to long-term use, when performing a so-called lapping work in which an abrasive is applied and the reel blade 22 is driven in reverse, so-called lapping work is performed. By the operation of, the height position of the reel blade 22 with respect to the fixed blade 24 can be easily positioned at an appropriate height position where a suitable polishing action can be obtained.

Explaining the hydraulic circuit, as shown in FIG. 13, a hydraulic pump 32 driven by the engine 6 is shown.
First, the first solenoid valve 33 that switches the flow state of the hydraulic oil to each hydraulic motor 25 to the drive stop state, the normal rotation drive state, and the reverse rotation drive state, and the flow state of the hydraulic oil to each hydraulic cylinder 20 to the drive stop state. A second electromagnetic valve 34 that switches between an ascending drive state and a descending drive state is connected in series via a first oil passage 35 and a second oil passage 36. The hydraulic motors 25 are connected in series in a first delivery oil passage 37 that connects them to the first electromagnetic valve 33. On the other hand, the hydraulic cylinders 20 are connected in parallel in the second delivery oil passage 38 that connects them to the second electromagnetic valve 34. The second delivery oil passage 38 is provided with a first check valve 39 and a second check valve 40 for preventing the reel mower from descending. The second check valve 40 is the second solenoid valve 3
4 is operated by the pilot pressure that is increased as the flow state of the hydraulic oil for each hydraulic cylinder 20 is switched to the descent drive state, whereby the descent of each reel mower 2 by its own weight is allowed. Each hydraulic motor 25 extends from the first oil passage 35 to the second oil passage 36.
A first bypass oil passage 42 having a first variable throttle valve 41 for adjusting the drive speed of is connected. Second oil passage 3
A second bypass oil passage 45 provided with a second variable throttle valve 44 for adjusting the ascending drive speed of the reel mower 2 by each hydraulic cylinder 20 is connected across 6 and the drain oil passage 43. Each hydraulic motor 2 is provided in the first delivery oil passage 37.
5 is provided with three first opening / closing valves 46 connected in parallel to each other, and each hydraulic motor 25 is individually stopped by switching the first opening / closing valves 46 to the open state. It can be maintained in a standing state. On the other hand, the second delivery oil passage 38 is provided with three second on-off valves 47 connected in series to each of the hydraulic cylinders 20, and these second on-off valves 47 are closed. By switching, each hydraulic cylinder 20 can be maintained in a state where it is individually stopped. Incidentally, reference numeral 48 shown in FIG.
Is a first relief valve that secures the drive pressure of each hydraulic motor 25, reference numeral 49 is a second relief valve that secures the drive pressure of each hydraulic cylinder 20, and reference numeral 50 is each hydraulic cylinder when the reel mower 2 is driven downward. This is a third relief valve for expressing a so-called floating state in which a back pressure is applied to 20 to reduce the ground pressure of each reel mower 2.

As shown in FIGS. 8 and 14, the traveling body 1
Operation box 5 on the right side of the driver's seat 14 in
1 has been deployed. On the operation box 51, an operation lever 52 configured as a compound operation type capable of performing an oscillating operation in the front-rear direction and the left direction from the neutral position, and oscillating the operation lever 52 to a lowering operation position in front of the neutral position. The lowering switch 53 which is turned on by operating the lowering switch 53 and the operating lever 52 which are turned on by swinging the operating lever 52 to a raising operating position rearward from the neutral position, the operating lever 52 which is a forward rotation driving position to the left of the neutral position. A forward rotation switch 55, a green forward rotation lamp 56, a reverse rotation switch 57 including a yellow reverse rotation lamp 57A, and a stop switch 58 including a red stop lamp 58A are provided which are turned on by swinging to the front. Has been. The traveling machine body 1 is equipped with a control device 59 for controlling the lifting and driving of each reel mower 2.

When the lowering switch 53 is turned on by the swinging operation from the neutral position of the operating lever 52 to the frontward lowering operating position, the control device 59 switches the second solenoid valve 34 to the lowering driving state. The hydraulic cylinders 20 are shortened by the weight of each reel mower 2 to simultaneously lower each reel mower 2. On the contrary, when the raising switch 54 is turned on by the swinging operation from the neutral position of the operating lever 52 to the rearward raising operation position, each hydraulic cylinder is extended by switching the second solenoid valve 34 to the raising drive state. The reel mowers 2 are operated to be raised simultaneously. Also, the operating lever 5
When the forward rotation switch 55 is turned on by the swing operation from the neutral position to the left forward rotation driving position, the forward rotation lamp 5
When 6 is turned on and the lowering switch 53 is turned on by a swinging operation from the neutral position of the operating lever 52 to the lowering operating position in the front within a predetermined time (for example, within 3 seconds) after the operation, By switching the one solenoid valve 33 to the normal rotation driving state, each hydraulic motor 25 is driven to rotate normally, and the reel blades 22 of each reel mower 2 are simultaneously driven to rotate normally. On the other hand, if the swing operation from the neutral position of the operation lever 52 to the forward lowering operation position is not performed within a predetermined time after the ON operation of the forward rotation switch 55, the forward rotation lamp 56 is turned off, and then the forward rotation lamp 56 is turned off. Even if the lowering switch 53 is turned on by the swinging operation from the neutral position of the operating lever 52 to the front lowering operating position, the first solenoid valve 33 is maintained in the drive stopped state and each reel mower 2 is operated.
The reel blade 22 is not driven to rotate normally.

That is, the operation lever 52 is used for both the reel mower elevating operation and the reel blade driving operation, and it is difficult to make an erroneous operation such as unintentionally touching the operation lever 52 with a part of the body. Operation in the blade drive operation direction and operation lever 52 in a reel mower elevating operation direction different from the operation direction within a predetermined time from the operation.
The control device 59 is configured to start the normal rotation of the reel blade 22 of each reel mower 2 based on the two-step operation including the operation to the descending operation position of the body part of the body. It is possible to avoid the inconvenience that the reel blade 22 of each reel mower 2 is unexpectedly started to rotate normally due to an erroneous operation such as touching the operation lever 52.

When the reverse rotation switch 57 is turned on, the control device 59 turns on the reverse rotation lamp 57A, and within a predetermined time (for example, within 3 seconds) after the operation, the controller 59 moves forward from the neutral position of the operation lever 52. When the lowering switch 53 is turned on by the swinging operation to the lowering operation position, the first electromagnetic valve 33 is switched to the reverse driving state,
The respective hydraulic motors 25 are driven in the reverse direction so that the reel blades 22 of the reel mowers 2 are simultaneously driven in the reverse direction.
On the other hand, if the swing operation from the neutral position of the operation lever 52 to the front lowering operation position is not performed within a predetermined time after the reverse operation switch 57 is turned on, the reverse rotation lamp 57A is operated.
Is turned off, and then the lowering switch 5 is moved by swinging the operating lever 52 from the neutral position to the lowering operating position in front.
Even if 3 is turned on, the first electromagnetic valve 33 is maintained in a drive stopped state so that the reel blades 22 of each reel mower 2 are not driven in reverse.

That is, when the reverse switch 57 is turned on,
Based on a combined operation within a predetermined time from the operation and an operation of moving the operation lever 52 to a lowering operation position different from the operation, the control device 59 causes the reel blade 22 of each reel mower 2 to operate.
Is configured to be started in reverse, whereby the reel blades 22 of each reel mower 2 are unintentionally operated by mistaken operation such as touching the reverse switch 57 by a part of the body.
It is possible to avoid the inconvenience of unexpectedly being started in reverse.

On the other hand, the control device 59 turns off the forward rotation lamp 56 or the reverse rotation lamp 57A when the stop switch 58 is turned on while the reel blades 22 of each reel mower 2 are being driven to rotate in the normal rotation or in the reverse rotation. Further, while the stop lamp 58A is turned on, the first electromagnetic valve 33 is switched to the drive stop state, so that the hydraulic motors 25 are stopped and the reel blades 22 of the reel mowers 2 are simultaneously stopped. ing. The control device 59 is
Until the stop switch 58 is turned off, the reel blade 22 is kept in the rotation stopped state regardless of the reel mower normal rotation start operation and the reverse rotation start operation, and when the stop switch 58 is turned off, the stop lamp 58A is turned on. It is adapted to be turned off and switched to a standby state in which the control operation based on the above-described reel mower normal rotation start operation and reverse rotation start operation is permitted.

As shown in FIGS. 8, 13 and 14, an operating portion 60 is formed on the left side of the driving seat 14 in the traveling machine body 1. The operation unit 60 is linked to a second opening / closing valve 47 connected in series to the left reel mower lifting hydraulic cylinder 20 and a first opening / closing valve 46 connected in parallel to the left reel blade driving hydraulic motor 25. First operation tool 61, a second opening / closing valve 47 connected in series to the central hydraulic cylinder 20 for raising and lowering the reel mower, and a first opening / closing valve 46 connected in parallel to the central reel blade driving hydraulic motor 25. A second operation tool 62 linked to the second operation valve, a second opening / closing valve 47 connected in series with the right side reel mower elevating hydraulic cylinder 20 and a first side parallel connection with the right reel blade driving hydraulic motor 25. Third operation tool 6 linked to the on-off valve 46
3, etc. are equipped. Then, the first operation tool 61 to
When any one of the third operating tools 63 is switched from the drive position to the stop position, the corresponding second on-off valve 47 is switched from the open state to the closed state, and the corresponding first on-off valve 46 is switched from the closed state to the open state. It is designed to be used.

That is, by the switching operation of each of the operation tools 61 to 63, a locked state for maintaining the reel mower 2 in the up / down stop state and the rotation stop state for each reel mower 2 regardless of the reel mower elevating / lowering operation and the rotation start operation described above. By doing so, it is possible to easily perform a selection drive operation for selecting and driving the reel mower 2 to be used during work.

Reference numeral 64 in FIG. 8 is an operating lever for operating the second variable throttle valve 44 for adjusting the rising drive speed of the reel mower 2 by each hydraulic cylinder 20.

[Other Embodiments] Other embodiments of the present invention will be listed below. The riding mower may be one in which a blade mower 2 having a rotating blade, which is an example of a cutting blade 22, is vertically movable. The operation lever 53 is configured to be swingable rightward from the neutral position, and the reverse switch 58 is arranged so as to be turned on by the swinging operation of the operation lever 53 rightward from the neutral position. The device 63 has the operation lever 5
The reverse rotation lamp 58A is turned on as the reverse rotation switch 58 is turned on by the swing operation from the neutral position to the right reverse rotation drive position, and the operation is performed within a predetermined time (for example, within 3 seconds) from the operation. Only when the lowering switch 54 is turned on by the swinging operation from the neutral position of the lever 53 to the front lowering operation position, the first electromagnetic valve 33 is switched to the reverse rotation driving state and the hydraulic motor 25 is reversely driven. The cutting blade 22 of the mower 2 may be driven in reverse. The control device 63 causes the raising switch 55 to move by swinging the operating lever 53 from the neutral position to the rearward raising operation position.
Is turned on, the second solenoid valve 34 is switched to the ascending drive state to extend the hydraulic cylinder 20 to raise the mower 2 and the first solenoid valve 33 is switched to the drive stop state. The motor 25 may be stopped and the cutting blade 22 of the mower 2 may be stopped. Various changes can be made to the setting of the predetermined time, which is the time during which the rotation activation of the cutting blade 22 of the mower 2 is permitted. Operation of the operation lever 53 in the cutting blade drive operation direction, and operation lever 5 in a mower lifting operation direction different from that operation direction
When the two-step operation including the operation to the lowering operation position of No. 3 is continuously performed, the control device 63 may rotate and activate the cutting blade 22 of the mower 2 regardless of the predetermined time.

[Brief description of drawings]

1] Overall side view of a riding-type mower

FIG. 2 is a rear side view of a riding-type mower showing a state in which the grass container is changed to a discharging position.

FIG. 3 is a side view of the rear part of the fuselage showing a dust-proof structure and the shape of an oil cooler with a part thereof cut away.

FIG. 4 is a partially cutaway plan view of the rear part of the machine showing the shape of the dustproof structure and the oil cooler.

5A is a perspective view of a main part showing the shape and configuration of the dustproof structure. FIG. 5B is a front view showing the shape of the oil cooler.

FIG. 6 is a front view of the riding type mower showing a state in which the reel mower is grounded.

FIG. 7 is a front view of the riding-type mower showing a state in which the reel mower is raised.

FIG. 8 is a schematic plan view of a riding-type mower showing a support structure of a reel mower and an arrangement of operation levers and the like.

FIG. 9 is a side view of an essential part showing a lift-and-lower drive structure for the left and right center reel mowers.

FIG. 10 is a side view of an essential part showing a lifting and lowering drive structure for the reel mowers at the left and right ends.

FIG. 11 is a side view showing the configuration of a reel mower.

FIG. 12 is a vertical sectional side view showing the configuration of a reel mower.

FIG. 13 is a hydraulic circuit diagram showing a hydraulic configuration for a reel mower.

FIG. 14 is a block diagram showing a control configuration for a reel mower.

[Explanation of symbols]

1 traveling aircraft 2 more 22 Cutting blade 53 Control lever A lifting link mechanism

Front page continued (72) Inventor Junichi Kitamura 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Koji Fujiwara 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) ) Inventor Kazuyoshi Togo, 64 Ishizukita-machi, Sakai, Osaka Prefecture Kubota Sakai Plant (72) Inventor Yoshiyuki Ezaki, 64, Ishizukita-machi, Sakai City, Osaka (56) References Kohei Taira 10-84734 (JP, A) JP-A-2-46218 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01D 34/56 A01D 34/54 A01D 69/00

Claims (2)

(57) [Claims] 1. A riding-type mower in which a mower is connected to a front portion of a traveling machine body via an elevating link mechanism so that the mower can be moved up and down. Two-stage operation, one for the blade driving operation and one for the operation of the operating lever in the cutting blade driving operation direction, and the subsequent operation of the operating lever in the descending operation position in a mower lifting operation direction different from that operation direction. A riding-type mower configured such that the cutting blade of the mower is rotationally activated based on an operation. 2. The cutting blade of the mower is rotationally activated only when the operation lever is moved to the lowering operation position within a predetermined time after the operation lever is operated in the cutting blade drive operation direction. The riding mower according to claim 1, wherein the riding mower is configured as described above.