JP4207208B2 - Mowing unit lifting device for riding mower - Google Patents

Description

  The present invention relates to a riding mower used for cutting weeds such as orchards and fallow fields, and more particularly, to a lifting device that lifts and lowers a cutting portion provided below the center of the fuselage.

Patent Document 1 discloses a riding mower equipped with a mowing device that can be moved up and down via a link mechanism below the center of the body and a seat on which a driver sits. The raising and lowering of the reaping device is performed using a driving device such as an actuator.
JP 2002-27815 A

The reaping device that moves up and down using these driving devices has a problem that it is difficult to raise and lower the reaping device manually when the driving device breaks down. Therefore, if the mowing device cannot be raised or lowered during the mowing operation, the operation cannot be continued, and if the mowing device is lowered to the lower limit position, it becomes impossible to run or is loaded into the car. There is also the inconvenience that it becomes impossible.
In addition, when an electric cylinder or the like is used for the drive device, it is difficult to raise and lower the mowing device after removing the battery or electrical wiring during maintenance. Similarly, when using a hydraulic actuator, etc. There was a problem that it was difficult to raise and lower the mowing device.
The present invention provides a mowing unit for a riding mower capable of manually raising and lowering the mowing device even when the raising and lowering drive device of the mowing device fails, and capable of switching to manual elevating easily and safely. It is an object to provide a lifting device.

In a riding mower provided with a mowing device 2 that can be moved up and down at the center lower part of the body 1 and a driving device 3 that drives the mowing device 2 up and down, an inner shaft 4 that is rotatably supported by the body 1 The shaft 5 is inserted, the driving device 3 is connected to one end of the inner shaft 5, the driving arm 6 connected to the reaping device 2 is fixed to the outer shaft 4, and when the reaping device 2 is raised and lowered by the driving device 3, The inner and outer shafts 5 and 4 are configured to be integrally rotatable, and provided with a release means 7 for releasing the integral rotation state. When the release means 7 is released, only the outer shaft 4 is turned. Thus, the trimming device lifting device of the riding mower can be manually moved up and down.
Further, a drive device 3 that drives the mowing device 2 to move up and down and an operating lever 9 for raising and lowering the mowing device 2 are disposed on the left and right sides of the seat 8 provided above the mowing device 2, and an inner shaft, an outer shaft 5, 4 is provided with a release means 7 for releasing the integral rotation state of the motor 4 and a mounting portion 11 of the manual lifting lever 10 for rotating the outer shaft 4 by manual operation. It is set as the structure of the raising / lowering apparatus of the riding mower formed by horizontal installation in the downward position between the motor | power_engine 12 provided in the back.

  The invention according to claim 1 is a riding mower provided with a mowing device 2 that can be moved up and down at the center lower part of the body 1 and provided with a driving device 3 that drives the mowing device 2 to move up and down. The driving device 3 is connected to one end portion of the inner shaft 5 of the outer shafts 5 and 4 in the double structure in which the inner shaft 5 is inserted into the outer shaft 4 to be supported. The driving arm 6 to be connected is fixed, and when the mowing device 2 is raised and lowered by the driving device 3, the inner and outer shafts 5, 4 are configured to be able to rotate integrally, and a release means 7 for releasing this integrally rotating state is provided. Since the release means 7 is released, the reaping device 2 is manually raised and lowered by rotating the outer shaft 4 together with the lifting arm 6 while the inner shaft 5 remains connected to the driving device 3. Even if the drive unit 3 breaks down, the mowing operation can be continued or Etc. are possible. Further, since the inner shaft 5 is inserted inside the outer shaft 4, the configuration of the inner and outer shafts 5, 4 and the configuration of the releasing means 7 are simplified, and the releasing and restoring of the releasing means 7 are performed. Can also be done easily. Further, it is possible to easily raise and lower the reaping device 2 manually during maintenance.

  According to the second aspect of the present invention, on the left and right sides of the seat 8 provided above the mowing device 2, a driving device 3 that drives the mowing device 2 to move up and down, and an operating lever 9 for raising and lowering are disposed. The release means 7 for releasing the integrally rotating state of the outer shafts 5 and 4 and the mounting portion 11 of the manual elevating lever 10 for rotating the outer shaft 4 by manual operation are arranged on the left and right other sides. Therefore, the release means 7 is released, the manual elevating lever 10 is attached, and the elevating and lowering is performed on the other side opposite to the left and right sides of the seat 8, which tends to be complicated due to the arrangement of the driving device 3 and the operation lever 9. The operation can be performed, and the operation can be easily and safely switched to the manual lifting operation of the mowing device 2.

Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 3 and 4, the riding mower of the present invention is provided with a pair of left and right front wheels 20 and rear wheels 21 on the front and rear of the traveling machine body 1, and a seat 8 on which a driver sits at the center. A steering wheel 23 for steering the front wheel 20 is provided in front of the seat 8, a prime mover 12 with an output shaft 24 suspended is disposed behind the seat 8, and an HST (no hydraulic pressure) is driven below the prime mover 12. A transmission 27 provided integrally with a step transmission) 26 is provided.
A cutting device 2 is provided in the lower abdomen of the body 1 between the front wheel 20 and the rear wheel 21, and the cutting device 2 is attached to the body 1 through a parallel link mechanism so as to be movable up and down. The cutting device 2 includes a large-diameter cutting blade 29 that rotates horizontally around a substantially vertical cutting blade shaft 28, a cutting blade cover 30 that covers the upper side and the side of the cutting blade 29, a cutting blade pulley 31, and the like. The cutting device 2 can be moved up and down integrally with the cutting blade 29.

An engine pulley 32 having two upper and lower stages is attached to the output shaft 24 of the prime mover 12, and a driving blade pulley 31 for driving the cutting blade 29 and an HST pulley 35 are driven by the V belts 33 and 34. Each is configured to be capable of transmission. The drive transmission to the cutting blade pulley 31 and the HST pulley 35 is not limited to the V-belt, but may be a transmission form using a chain, a gear, a transmission shaft, or the like.
A transmission mechanism between the prime mover 12 and the cutting blade pulley 31 is provided with a clutch mechanism for interrupting transmission. In the transmission of the V belt 33 according to the embodiment of the present invention, the tension clutch 36 can be used. The cutting blade cover 30 and the traveling machine body 1 thereabove are connected by two pairs of parallel link rods 37 and 38 so that the cutting device 2 can be moved up and down while maintaining a substantially horizontal state.

Outer shafts 5 and 4 are provided behind the seat 8 to raise and lower the reaping device 2. A drive arm 6 is welded to the outer shaft 4, and a cylinder arm 51 is welded to the inner shaft 5. A lift arm 52 is pivotally supported at the tip of the drive arm 6, and a cutting blade cover 30 is pivotally supported at the lower end of the lift arm 52, so that the drive arm 6 and the cutting device 2 are connected by a link configuration. .
The cylinder arm 51 is attached to the rod 54 side of the electric cylinder 53, and the electric cylinder 53 with the other side attached to the machine body 1 side is expanded and contracted, whereby the cylinder arm 51, the inner and outer shafts 5, 4, and the drive arm 6. The cutting device 2 can be moved up and down via the lifting arm 52. In addition, the pivot part of the cutting device 2 to the lifting arm 52 may be connected to the lower ends of the parallel link rods 37 and 38, and connected so that the entire cutting device 2 moves up and down when the lifting arm 52 is driven up and down. Just do it.

An operation lever 9 is provided on the left side of the seat 8, and when the operation lever 9 is turned on and off, the tension clutch 36 provided in the transmission path between the prime mover 12 and the cutting blade 29 is operated to The rotational drive to the blade 29 can be interrupted. In addition, as shown in FIG. 8, the operating lever 9 is provided with detecting means (limit switch 39) for detecting the on / off state of the operating lever 9, and this limit switch 39 is located on the operating position 9 side of the operating lever 9. It is provided. Therefore, when the operation of the operation lever 9 from the cutting position A to the entry position B is started, the limit switch 39 is turned off almost simultaneously, and this OFF signal is transmitted to the electric cylinder 53 that drives the mowing device 2 up and down. When the turning operation 9 is started, the lowering of the reaping device 2 can be started almost simultaneously.
The configuration of the drive device 3 that drives the mowing device 2 up and down is not limited to the electric cylinder 53, and a hydraulic cylinder, an air cylinder, or the like can also be used.

As shown in FIG. 8, in addition to the cable 41 for connecting and disconnecting the tension clutch 36, the operation lever 9 has a cutting blade brake (not shown) for braking the rotation caused by the inertial force of the cutting blade 29 when the cutting blade 29 is turned off. A cable 42 is provided to actuate (not shown).
An adjustment lever 43 that can adjust the height of the cutting device 2 is provided in the vicinity of the operation lever 9. A scale is displayed in the guide groove 44 of the adjustment lever 43. When the adjustment lever 43 is operated in the front-rear direction based on the scale, the cutting device 2 moves up and down according to the operation position. The operation position becomes the lifting / lowering stop position of the reaping device 2.
Accordingly, if the operation lever 9 is cut during the mowing operation, the mowing device 2 rises from the lift stop position to the upper limit, enters a traveling state in which the cutting blade 29 is not driven, and the operation lever is started when the next process starts. 9 is turned on, the cutting device 2 starts to descend, the cutting blade 29 is driven to rotate, and the cutting device 2 automatically descends to the lift stop position set by the adjustment lever 43. Mowing work can be started smoothly at the cutting height that is the same as the height.

  As shown in FIGS. 8 and 9, the specific configuration for raising and lowering the reaping device 2 is such that when the operating lever 9 is turned on and the limit switch 39 is turned off, the electric cylinder 53 is actuated to retract the rod 54. The cam 45 integral with the cylinder arm 51 pivotally supported at the tip of the rod 54 is rotated about the inner shaft 5. The cam 45 is configured to rotate integrally with the left and right plates shifted in phase, and a lowering cam 46 that operates in a direction to contract the rod 54 and a rising cam that operates in a direction to extend the rod 54. 47. The descending cam 46 and the ascending cam 47 are provided with a descending switch 48 and an ascending switch 49 that are turned on and off according to their respective rotational positions. The descending switch 48 and the ascending switch 49 rotate around the inner shaft 5. The cylinder arm 51 is movable and is arranged in parallel with a separate adjustment arm 56. Therefore, the cylinder arm 51 and the adjustment arm 56 can be rotated separately around the inner shaft 5 as the rotation center.

The lower end of the adjustment lever 43 and the adjustment arm 56 are connected by a connecting rod 57. When the adjustment lever 43 is operated in the front-rear direction, the adjustment arm 56 rotates together with the lowering switch 48 and the uppering switch 49. The cam 45 is formed with an elevation stop recess 55 in which both the lowering cam 46 and the elevation cam 47 are concave in side view. The cam 45 is rotated so that the elevation stop recess 55 is formed between the lowering switch 48 and the raising switch 49. When both are turned off, the expansion and contraction of the rod 54 of the electric cylinder 53 stops. Note that 58 provided below the ascent switch 49 is an upper limit switch that is turned on and off by the rotation of the cam 45 and determines the ascent upper limit position of the reaping device 2.
The lift stop recess 55 of the cam 45 in the state where the rod 54 of the electric cylinder 53 is extended is at the position E shown in FIG. 9, and when the cam 45 is in this state, the convex portion of the lift cam 47 sets the upper limit switch 58. Turned on. Further, the position of the reaping device 2 at this time is the state of traveling movement that has been raised most.
When the operation lever 9 is turned on from the state where the reaping device 2 is raised most, the limit switch 39 is turned off, the rod 54 of the electric cylinder 53 starts to shrink, and the reaping device 2 starts to descend. When the rod 54 is actuated in the contracting direction, the cam 45 is rotated, and the elevation stop recess located at the E position is moved clockwise in the side view of FIG. 9, and both the descending switch 48 and the ascending switch 49 are turned off. The rod 54 stops. The expansion / contraction operation direction of the rod 54 is determined by the ON / OFF operation state of the lowering switch 48 and the uppering switch 49. If only the lowering switch 48 is ON, the rod 54 is contracted, and if only the uppering switch 49 is ON. The rod 54 is set to extend.

The adjustment lever 43 is connected to an adjustment arm 56 that rotates together with the lowering switch 48 and the raising switch 49, and can arbitrarily adjust the cutting height of the cutting device 2. Accordingly, when the adjustment lever 43 is operated, one of the lowering and raising switches 48 and 49 is disengaged from the elevation stop recess 55 and turned ON, and the elevation stop recess 55 follows and moves in the direction in which both switches 48 and 49 are turned OFF. Stop moving up and down.
In the present embodiment, since the cutting device 2 is moved up and down while the cutting blade 29 is driven, the cutting height is regulated so that the cutting height can be adjusted only when the cutting device 2 is lowered to the lower region. A restriction pin 61 is extended from the plate 60 fixed to the traveling machine body 1 side, and the restriction pin 61 passes through a long hole portion 62 of the adjustment arm 56. Rotation is possible. Therefore, even if the adjustment lever 43 is inadvertently operated while the cutting blade 29 is being driven, the cutting height of the cutting device 2 rises and falls within the regulation range, and the V belt 33 does not come off the pulleys 31 and 32.
In FIG. 9, the regulation pin 61 also penetrates the long hole of the cam 45. However, since the long hole wider than the rotation range of the cam 45 is formed, the rotation of the cam 45 is not affected at all. .
When the operation lever 9 is turned from the cutting work position of the cutting device 2 shown in FIGS. 8 and 9, the limit switch 39 is turned on, the rod 54 of the electric cylinder 53 extends, and the cam 45 rotates counterclockwise. When the convex portion of the ascending cam 47 turns on the upper limit switch 58 due to the left rotation of the cam 45, the rod 54 stops.

Next, the configuration of the inner shaft 5 and the outer shaft 4 that are horizontally mounted between the seat 8 and the prime mover 12 will be described. The outer shaft 4 is rotatably supported by a support body 19 provided on the machine body 1 side, and the inner shaft 5 is inserted into the outer shaft 4 in a form that can rotate within the outer shaft 4. It is. An electric cylinder 53 is attached to the left end portion of the inner shaft 5 via a cylinder arm 51, and the cylinder arm 51 and the inner shaft 5 can be rotated as the electric cylinder 53 expands and contracts.
The inner and outer shafts 5, 4 are laid horizontally to the left and right sides of the seat 8, and a pair of left and right drive arms 6 are fixed to an intermediate portion of the rotatable outer shaft 4. The right end portion of the outer shaft 4 is provided with a releasing means 7 for rotating the inner shaft 5 and the outer shaft 4 integrally or releasing this integrally rotating state. The specific structure of the releasing means 7 is to fix the rotation by fixing the flanges 64 and 65 to the right end portions of the inner and outer shafts 5 and 4, respectively, and fastening the flange 64 and the flange 65 with bolts 63. is there. Note that this rotation and fixing is not limited to the configuration of tightening with bolts or the like, and any means that enables connection and release using pins, gears, or the like may be used.

The flange 64 on the outer shaft 4 side is provided with an attachment portion 11 for attaching the manual elevating lever 10, and when the mowing device 2 is raised and lowered manually, it extends forward along the right side of the seat 8. The manual elevating lever 10 of the form is attached to the flange 64, the integral rotation of the inner and outer shafts 5, 4 is released, and the manual elevating lever 10 is operated up and down.
Regarding the cutting height adjustment of the cutting device 2 by the operation of the manual lifting lever 10, the pin 66 protruded sideways from the intermediate portion of the manual lifting lever 10 is engaged with the hooking groove 68 of the hooking plate 67, It is possible to hold at an appropriate angle.

  As described above, the integral rotation of the inner and outer shafts 5 and 4 can be easily released, and the space formed below between the seat 8 and the prime mover 12 is effectively utilized. Thus, the outer shafts 5 and 4 can be horizontally mounted on the left and right sides of the seat 8, and the structure of the double shaft in which the inner shaft 5 is inserted into the outer shaft 4 is compact and in a narrow space. It is also possible to place it horizontally.

Next, the upward movement permitting means 17 that allows the mowing apparatus 2 to move upward and the weight reducing means 18 that reduces the weight of the mowing apparatus 2 will be described with reference to FIGS. The electric cylinder 53 in the operation portion 74 disposed on the left side of the seat 8 has the cylinder side attached to the body 1 side, and the tip end of the rod 54 is attached to the cylinder arm 51. The cylinder arm 51 and the drive arm 6 are fixed so as to rotate integrally through the inner and outer shafts 5 and 4, and a pin 75 is provided at the tip of the drive arm 6. A sliding slot 77 provided at the upper end is pivotally supported. The lower end portion of the elevating arm 52 is pivotally supported by a shaft 76 fixed to the rear parallel link rod 38, and can be raised and lowered in a substantially horizontal state by the parallel link rods 37 and 38 by extending and contracting the rod 54 of the electric cylinder 53. The mowing device 2 is configured to be movable up and down by driving the drive arm 6.
A pin 75 of the drive arm 6 is engaged with the sliding long hole 77 provided at the upper end of the elevating arm 52, and the weight of the cutting device 2 is supported by the pin 75 at the upper end position of the sliding long hole 77. is there. In this state, when the reaping device 2 rides on the obstacle below, the position of the pin 75 does not change, and the lifting arm 52 is lifted upward. Therefore, the sliding long hole 77 slides on the pin 75 to allow the upward movement of the cutting device 2. It is the upward movement permission means 17 that allows the movement of the cutting device 2.

A tension spring 16 is stretched between a pin 75 of the drive arm 6 and a shaft 76 that pivotally supports the elevating arm 52. For example, when the load for moving the reaping device 2 downward is 50 kg, the tension of the spring 16 is stretched with a tension of about 30 kg below the load, and the weight of the reaping device 2 is reduced to about 20 kg. It can act. The weight reducing means 18 reduces the weight of the reaping device 2.
When the spring 16 is stretched between the traveling machine body 1 and the cutting device 2, the tension length of the spring 16 changes when the height of the cutting device 2 is changed. For example, at a certain cutting height position, the cutting is performed. Even if the weight of the device 2 is reduced to 20 kg, when the mowing device 2 is lowered from this position, the spring 16 extends and the tension increases, and the weight of the mowing device 2 becomes less than 20 kg. 2 easily floats and the cutting height becomes unstable. Conversely, when the mowing device 2 is raised, the tension of the spring 16 becomes weaker and the weight of the mowing device 2 increases than 20 kg, and the cutting blade 29 and the cutting blade cover 30 are grounded by the weight of the mowing device 2 itself. The impact when riding on an obstacle is large, and the mowing device 2 may be damaged.

In the present embodiment, the upward movement permitting means 17 and the weight reducing means 18 are provided between the drive arm 6 and the reaping device 2. As a specific configuration, the pin 75 of the driving arm 6 and the reaping device 2 are provided. Weight reduction by the upward movement permitting means 17 in which the inside of the sliding long hole 77 of the elevating arm 52 slides the pin 75 between the shaft 76 on the side and the spring 16 stretched between the pin 75 and the shaft 76 Since the means 18 is provided between the drive arm 6 and the mowing device 2, the mowing device 2 moves upward and retracts even when the mowing device 2 rides on the convex ground or an obstacle during the mowing operation. In addition, the reaping device 2 and its lifting / lowering drive device are not damaged.
Further, even when the reaping device 2 is moved up and down, the tension length of the spring 16 stretched between the drive arm 6 and the reaping device 2 does not change, and the reaping device 2 is moved up and down with respect to the reaping device 2. The weight change can be kept small, so that the weight can be stably maintained, the cutting performance can be fully exerted, and the cutting device 2 with reduced weight is moved upward with a force lighter than the original weight. Therefore, the impact at the time of grounding is relieved, and the upward retracting operation of the cutting device 2 is smooth and stable.

FIG. 7 shows an adjustment mechanism 15 that can adjust the tension length of the spring 16 at the lower part of the lifting arm 52. The spring 16 engages with a pin 75 provided on the drive arm 6 at the upper end, and adjusts the adjustment screw 78 of the adjustment mechanism 15 to adjust the tension length of the spring 16, thereby adjusting the weight of the cutting device 2 to an arbitrary weight. Can be set to
Accordingly, it is possible to selectively adjust the weight of the cutting device 2 in accordance with the working conditions such as the density of the grass, the height of the grass, the hardness of the ground, and the degree of unevenness.

The principal part top view of this invention. The side view and back view which show the manual raising / lowering part of a cutting device. Overall side view. Overall plan view. The side view which shows the drive raising / lowering part of a mowing apparatus. The side view which shows the drive raising / lowering part of a mowing apparatus. The side view which shows the example according to the part. The side view which shows the raising / lowering operation part of a mowing apparatus. The side view and front view which show the cutting height adjustment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airframe 2 Mowing device 3 Drive device 4 Outer shaft 5 Inner shaft 6 Drive arm 7 Release means 8 Seat 9 Operation lever 10 Manual raising / lowering lever 11 Attachment part 12 Motor | power_engine

Claims (2)

  Aircraft (1) In a riding mower provided with a mowing device (2) that can be moved up and down at the center lower part, and a driving device (3) that drives the mowing device (2) to move up and down, the airframe (1) is freely rotatable. The inner shaft (5) is inserted into the outer shaft (4) supported by the inner shaft (5), the drive device (3) is connected to one end of the inner shaft (5), and the cutting device (2) is connected to the outer shaft (4). The drive arm (6) to be connected to is fixed, and the inner and outer shafts (5) and (4) can be integrally rotated when the mowing device (2) is moved up and down by the drive device (3). A release means (7) for releasing the integral rotation state is provided, and when the release means (7) is released, the manual mowing device (2) is moved up and down by rotating only the outer shaft (4). A mowing part lifting device for a riding mower that makes it possible.   On the left and right sides of the sheet (8) provided above the mowing device (2), there are disposed a driving device (3) for driving the mowing device (2) up and down, and an operating lever (9) for elevating the others. A release means (7) for releasing the integrally rotating state of the inner and outer shafts (5), (4) on the side, and a mounting portion (10) for manually lifting and lowering lever (10) for rotating the outer shaft (4) by manual operation ( 11), and the inner and outer shafts (5), (4) are horizontally mounted at a lower position between the seat (8) and the motor (12) provided behind the seat (8). The mowing part raising / lowering device of the riding mower according to Item 1.

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