JP5907520B2 - Linkage mechanism of outside operation tool in riding type rice transplanter - Google Patents

Description

  The present invention relates to a riding type rice transplanter including an outside operation tool for performing a traveling operation from outside the vehicle when crossing a ridge, and more particularly to a linkage mechanism of the outside operation tool in the riding type rice transplanter.

  The riding type rice transplanter includes a planting machine connected to the rear part of the traveling machine body via a lifting link mechanism. The planting machine is a heavy working machine equipped with various parts and devices, such as a seedling stage for placing seedlings, a lateral feed mechanism for laterally feeding seedlings, and a planting mechanism for planting seedlings. For this reason, when the planting work machine is lifted, the traveling machine body rises forward (the front wheel is lifted) and it is difficult to escape from the field.

  Therefore, a riding-type rice transplanter equipped with a front press operating tool that suppresses the forward rise of the traveling machine body by human power (downward pressing operation force), and an external operation tool (clutch operating tool) for performing a driving operation from the outside of the vehicle when over the heel. It has been known. For example, the riding type rice transplanter shown in Patent Document 1 includes an outside operation tool that is also used as a front pressing operation tool, and the riding type rice transplanter shown in Patent Document 2 includes a front pressing operation tool and an outside of the vehicle. A separate operation tool is provided.

JP 2006-230331 A JP 2007-148 A

  However, when crossing the heel, there was a problem that the front wheel slipped and the heel could not be crossed well if the direction of the aircraft approaching the heel was bad or the front wheel was in poor contact with the ground and only one wheel floated.

The present invention has been created in order to solve these problems in view of the above circumstances, and is a riding type rice transplanter equipped with an external operation tool for performing a traveling operation from outside the vehicle when crossing a ridge. A differential lock mechanism that selectively locks the differential between the left and right front wheels, a clutch mechanism that turns on and off the transmission of driving force to the wheels, a brake mechanism that brakes the wheels, a clutch pedal that can be stepped on, and a clutch pedal A clutch pedal operation system that operates the clutch mechanism and the brake mechanism according to the operation, a linkage operation tool that can be operated to the linkage position and the linkage release position, and a clutch pedal operation system that controls the outside operation tool according to the linkage operation of the linkage operation tool. The external operation tool linkage mechanism that enables the clutch mechanism and the brake mechanism to be operated by the external operation tool, and the linkage operation of the linkage operation tool. Automatically the differential lock state differential lock mechanism Te comprises a differential lock linkage mechanism, a linkage operation tool is also used as a parking brake operating member for holding the operating posture depressing the clutch pedal in response to the association operation, differential lock linkage mechanism Is a linkage mechanism for an outside operating tool in a riding type rice transplanter , wherein the diff lock mechanism is automatically brought into a diff lock state during parking brake .

According to the first aspect of the present invention, the differential lock mechanism automatically enters the differential lock state in accordance with the linkage operation of the linkage operation tool that is performed at the time of crossing over the eaves. It can be performed. Also, since the communicating engagement operation tool is also used as a parking brake operating member, not only can be improved reduction and operability parts, at the time of the parking brake can be a four-wheel brake state by automatic differential lock .

It is a whole side view of a riding type rice transplanter. It is a top view of a traveling body. It is a transmission diagram of a riding type rice transplanter. It is a side view which shows a vehicle exterior operation tool, a clutch pedal, and a vehicle exterior operation tool linkage mechanism (non-linkage state). It is a top view which shows a vehicle exterior operation tool, a clutch pedal, and a vehicle exterior operation tool linkage mechanism. It is a front view which shows the periphery of a linkage operation tool. It is a side view which shows a vehicle operating tool, a clutch pedal, and a vehicle operating tool linkage mechanism (linked state). It is a side view which shows a diff lock linkage mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a riding type rice transplanter. The riding type rice transplanter 1 includes a traveling machine body 2 and a planting work machine 4 connected to a rear portion of the traveling machine body 2 via a lifting link mechanism 3. It is prepared for. The planting work machine 4 has various types such as a seedling stage 5 on which seedlings are placed, a lateral feed mechanism (not shown) for laterally feeding the seedling stage 5, and a planting mechanism 6 for scraping and planting seedlings. It is a heavy working machine equipped with parts and devices.

  As shown in FIGS. 1 and 2, the traveling machine body 2 also serves as an engine mounting portion 7 on which the engine E is mounted, a transmission case 8 for shifting engine power, an operation portion 9 on which an operator gets on, a steering wheel, and a driving wheel. The vehicle is a passenger-type four-wheel vehicle including a front wheel 10 and a rear wheel 11 that is a driving wheel. The vehicle body front end portion is provided with a vehicle exterior operation tool 12 for performing a traveling operation from the outside of the vehicle when the vehicle crosses the heel.

  As shown in FIG. 3, the power of the engine E is input to a main transmission mechanism 14 composed of an HST (hydrostatic continuously variable transmission) via a belt tension type clutch mechanism 13. The engine power input to the main transmission mechanism 14 is continuously variable within the main transmission mechanism 14 and input to the mission case 8.

  In the transmission case 8, transmission shafts such as an input shaft 15, a planting transmission shaft 16, a first traveling transmission shaft 17, and a second traveling transmission shaft 18 are provided. The power input from the main transmission mechanism 14 to the input shaft 15 is transmitted to the planting transmission shaft 16 via the inter-strain transmission mechanism 19, and at the same time via the torque limiter 20 and the planting clutch 21. To the planting PTO shaft 22. The power extracted from the planting PTO shaft 22 is transmitted to the planting work machine 4 via a transmission mechanism outside the mission case 8.

  The power input from the main transmission mechanism 14 to the input shaft 15 is transmitted to the first travel transmission shaft 17 via the auxiliary transmission mechanism 23 and from the first travel transmission shaft 17 to the second travel transmission shaft 18. Be transmitted. The power transmitted to the second travel transmission shaft 18 is transmitted to the left and right front wheel drive shafts 25L and 25R via the front wheel differential mechanism 24 and also transmitted to the travel PTO shaft 26. The power extracted from the traveling PTO shaft 26 is transmitted to the rear axle case 27 via a transmission mechanism outside the transmission case 8. Incidentally, the rear axle case 27 is configured to transmit power to the left and right rear wheels 11 via the left and right side clutches 28L and 28R provided therein.

  A differential lock mechanism 29 that selectively locks the differential between the left and right front wheels 10 is added to the front wheel differential mechanism 24. The front wheel differential mechanism 24 normally allows power to be transmitted to the left and right front wheels 10 and allows differential (rotational difference) between the left and right front wheels 10, but when the diff lock mechanism 29 is operated to the diff lock state, The left and right front wheel drive shafts 25L and 25R are integrally coupled, and the differential between the left and right front wheels 10 is locked.

  A brake mechanism 30 is provided at one end of the first travel transmission shaft 17. The brake mechanism 30 is operated simultaneously with the clutch mechanism 13 and brakes the front wheels 10 and the rear wheels 11 through the traveling power transmission path. However, since the front wheel differential mechanism 24 is provided in the front wheel transmission path, the front wheel 10 is braked and the four-wheel brake state is established only when the differential lock mechanism 29 is in the differential lock state.

  As shown in FIGS. 1 and 2, the operation unit 9 includes a driver's seat 31 on which an operator sits, a steering handle 33 that steers the front wheels 10 via the pitman arm 32, and a main transmission lever 34 that performs a shift operation of the main transmission mechanism 14. A clutch pedal 35 for operating the clutch mechanism 13 and the brake mechanism 30 at the same time is disposed.

  As shown in FIGS. 4 and 5, the clutch pedal 35 can be stepped on by a vertical rotation with the pedal shaft 36 as a fulcrum. Arms 37 and 38 that rotate back and forth in response to the depression of the clutch pedal 35 are provided at both left and right ends of the pedal shaft 36. The right arm 37 is connected to a spring 39 that urges the clutch pedal 35 upward, and is connected to a linkage arm 41 (to be described later) via a rod 40, so that the linkage arm is operated according to the depression operation of the clutch pedal 35. 41 is rotated back and forth.

  The left arm 38 is connected to the shaft 44 via the rod 42 and the arm 43, and vertically rotates the arms 45 and 46 provided on the shaft 44 in response to the depression operation of the clutch pedal 35. One arm 45 is connected to a tension arm 50 of the clutch mechanism 13 via a roller 47, an arm 48, and a shaft 49, and switches the clutch mechanism 13 to a disengaged state in response to a depression operation of the clutch pedal 35. The other arm 46 is connected to the brake mechanism 30 via the rod 51, and switches the brake mechanism 30 to the braking state in response to the depression operation of the clutch pedal 35.

  As shown in FIGS. 4 to 8, in the vicinity of the front of the clutch pedal 35, a linkage operation tool 52 that also serves as a parking brake operation tool is disposed. The linkage operation tool 52 is a lever member that is allowed to perform a forward / backward rotation operation with the first lever support shaft 53 as a fulcrum and a left / right rotation operation with the second lever support shaft 54 as a fulcrum. It is being urged towards. The operation direction and the operation position of the linkage operating tool 52 are defined by a lever guide groove 56a having an L-shape in plan view formed in the lever guide 56. The linkage release position, which is the front end of the lever guide groove 56a, and the lever guide It can be operated to the linkage position which is the rear end (right end) of the groove 56a.

  At the base of the linkage operation tool 52, a steering linkage arm 57 that rotates back and forth integrally with the linkage operation tool 52, a turning plate 58 that can turn back and forth around the first lever support shaft 53, and the turning A hook-like pedal link plate 60 is provided at the rear end of the plate 58 via a support shaft 59 so as to be rotatable up and down. The rotation plate 58 has a roller 58a on one side of the rear end portion, and the rotation position is defined by the roller 58a coming into contact with a rotation restricting arm 61 described later from below. The pedal link plate 60 includes a pin 60 a that abuts on the rear end of the link operation tool 52 and is biased upward by a spring 62 interposed between the pedal link plate 60 and the rotating plate 58. When the linkage operating tool 52 is operated to the linkage position with the clutch pedal 35 depressed, the pedal linkage plate 60 rotates downward following the linkage operating tool 52 and engages with the linkage arm 41. As a result, the clutch pedal 35 is held in the depressing operation posture and the parking brake state is set.

  The vehicle operation tool 12 is selectively linked to the clutch pedal operation system via the vehicle operation tool linkage mechanism 63. In a state linked to the clutch pedal operation system, the clutch mechanism 13 and the brake mechanism 30 can be operated by the outside operation tool 12. The vehicle exterior operating tool 12 is provided at the front part of the machine body so as to be movable up and down, and is urged toward the upper operation position. At the upper operation position, the vehicle body is stopped from traveling. It is linked to the clutch pedal operation system so that the vehicle travels. Further, the outside operation tool 12 at the lower operation position can also be used as a front pressing operation tool that suppresses the front elevation of the airframe by human power. Hereinafter, specific configurations of the vehicle operation tool 12 and the vehicle operation mechanism linkage mechanism 63 will be described.

  The outside operating tool 12 includes a U-shaped frame 65 that can be rotated up and down around a support shaft 64, a pair of left and right handles 66 extending upward from the front end of the frame 65, and the frame 65 upward. And a spring 67 that is biased toward the head. Since the frame 65 of this embodiment is connected to a cylinder portion 68 provided on the support shaft 64 so as to be slidable back and forth, the handle 66 is normally along the front end of the machine body as shown in FIG. Thus, the handle 66 can be used by pulling it forward only when over the heel.

  The outside operation tool linkage mechanism 63 is configured using the parking brake mechanism described above, and the outside operation tool 12 is linked to the clutch pedal operation system according to the linkage operation of the linkage operation tool 52, and the outside operation tool 12 is used. The clutch mechanism 13 and the brake mechanism 30 can be operated. If demonstrating it concretely, the vehicle exterior operation tool linkage mechanism 63 of this embodiment is provided with the pipe shaft 69 which can rotate along the left-right direction. The above-described rotation restricting arm 61 is integrally provided at the right end portion of the pipe shaft 69, and the arm 70 is integrally provided at the left end portion of the pipe shaft 69. The arm 70 is connected to an arm 71 provided integrally with the support shaft 64 of the operation tool 12 outside the vehicle via a connection plate 72. That is, as shown in FIG. 7, when the outside operation tool 12 is operated downward in the parking brake state, the rotation restricting arm 61 rotates upward as the connecting plate 72 is pulled forward. When the rotation restricting arm 61 rotates upward, the rotation plate 58 and the pedal linkage plate 60 are pushed rearward, and the rod 40 moves rearward. As a result, the clutch pedal 35 rotates upward, so that the clutch mechanism 13 is engaged, the brake mechanism 30 is released, and the traveling machine body 2 starts traveling.

  Further, the traveling machine body 2 is automatically provided with a steering linkage mechanism 73 that locks the steering handle 33 in the straight position according to the linkage operation of the linkage operation tool 52, and a diff lock mechanism 29 according to the linkage operation of the linkage operation tool 52. A diff-lock linkage mechanism 74 that is in a diff-lock state is provided.

  The steering linkage mechanism 73 includes a shaft 75 that rotates concentrically with the pipe shaft 69. An arm 77 connected to the steering linkage arm 57 via a spring 76 is integrally provided at the right end of the shaft 75, while a steering lock extending forward of the pitman arm 32 is provided at the left end of the shaft 75. A bar 78 is provided integrally. That is, as shown in FIG. 7, when the linkage operation tool 52 is operated to the linkage position, the steering linkage arm 57 pulls up the arm 77 via the spring 76. When the arm 77 moves upward, the steering lock bar 78 abuts against the front end portion of the pitman arm 32 in an elastic manner as the shaft 75 rotates. When the steering handle 33 reaches the straight advance position, the steering lock bar 78 engages with the engagement groove 32a of the pitman arm 32, and the steering handle 33 is locked at the straight advance position.

  As shown in FIG. 8, the diff lock linkage mechanism 74 is configured by linking the linkage operation tool 52 to an existing diff lock operation system 79. The existing differential lock operation system 79 includes a differential lock pedal 80 that can be stepped on, arms 81 and 82 that rotate in response to the stepping operation of the differential lock pedal 80, and a rod 84 that connects the arm 82 to the operating lever 83 of the differential lock mechanism 29. And is configured. On the other hand, the differential lock linkage mechanism 74 includes a linkage lever 84 that is arranged in parallel with the operation lever 83 of the differential lock mechanism 29 and a linkage wire 85 that connects the linkage lever 84 to the linkage operation tool 52. The linkage lever 84 is linked to the pin 83a of the operating lever 83 through the long hole 84a. As a result, the linkage lever 84 rotates the actuation lever 83 according to the operation of the linkage operation tool 52 to the linkage position while allowing the actuation lever 83 to rotate according to the depression operation of the diff lock pedal 80, and the diff lock The mechanism 29 is switched to the differential lock state.

  According to the present embodiment configured as described above, it is a riding rice transplanter 1 including an out-of-vehicle operation tool 12 for performing a traveling operation from the outside of the vehicle when crossing a ridge, and selectively differentials between the left and right front wheels 10. A differential lock mechanism 29 for locking, a clutch mechanism 13 for turning on and off the transmission of driving force to the front wheels 10 and the rear wheels 11, a brake mechanism 30 for braking the front wheels 10 and the rear wheels 11, a clutch pedal 35 that can be stepped on, and a clutch A clutch pedal operation system that activates the clutch mechanism 13 and the brake mechanism 30 according to the operation of the pedal 35, a linkage operation tool 52 that can be operated to the linkage position and the linkage release position, and the outside of the vehicle according to the linkage operation of the linkage operation tool 52 The operation tool 12 is linked to the clutch pedal operation system, and the outside operation enabling the operation of the clutch mechanism 13 and the brake mechanism 30 by the outside operation tool 12 is enabled. Since the linking mechanism 63 and the diff lock linking mechanism 74 that automatically sets the diff lock mechanism 29 to the diff lock state in response to the linking operation of the linking operation tool 52 are provided, the linking operation of the linking operation tool 52 that is performed at the time of crossing the rod is performed. The diff lock mechanism is automatically set to the diff lock state, and slipping of the front wheel 10 when the heel is crossed can be prevented.

  The vehicle exterior operating tool 12 is provided at the front part of the machine body so as to be movable up and down, and is urged toward the upper operation position. At the upper operation position, the vehicle body is stopped from traveling. In addition, in the lower operating position, it can also be used as a front-pressing operation tool that suppresses the aircraft from being lifted by human power. With this, you can reliably cross the heel while preventing the aircraft from rising up.

  In addition, since the linkage operation tool 52 is also used as a parking brake operation tool that depresses the clutch pedal 35 in accordance with the linkage operation and holds the operation posture, not only can the number of parts be reduced and the operability can be improved, When braking, the four-wheel brake state can be set by automatic differential lock.

DESCRIPTION OF SYMBOLS 1 Riding type rice transplanter 2 Traveling machine body 4 Planting work machine 10 Front wheel 11 Rear wheel 12 Outside vehicle operation tool 13 Clutch mechanism 24 Front wheel differential mechanism 29 Differential lock mechanism 30 Brake mechanism 35 Clutch pedal 52 Linking operation tool 63 Outside vehicle operation tool linkage mechanism 73 Steering linkage mechanism 74 Differential lock linkage mechanism

Claims (1)

A riding type rice transplanter equipped with an outside operation tool for performing a traveling operation from outside the vehicle when crossing the ridge,
A differential lock mechanism that selectively locks the differential between the left and right front wheels;
A clutch mechanism that turns on and off the transmission of driving force to the wheels;
A brake mechanism for braking the wheel;
A clutch pedal that can be depressed and operated,
A clutch pedal operation system for operating the clutch mechanism and the brake mechanism in accordance with the operation of the clutch pedal;
A linkage operation tool operable at a linkage position and a linkage release position;
An outside operation tool linkage mechanism that links the outside operation tool to the clutch pedal operation system in accordance with the linkage operation of the linkage operation tool, and enables operation of the clutch mechanism and the brake mechanism by the outside operation tool;
A differential lock linkage mechanism that automatically puts the differential lock mechanism into a differential lock state according to the linkage operation of the linkage operation tool ,
The linkage operation tool is also used as a parking brake operation tool that depresses the clutch pedal in accordance with the linkage operation and holds the operation posture.
The differential lock linkage mechanism automatically puts the differential lock mechanism into the differential lock state at the time of parking brake .

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