WO2023007842A1 - トラクタ - Google Patents
トラクタ Download PDFInfo
- Publication number
- WO2023007842A1 WO2023007842A1 PCT/JP2022/014055 JP2022014055W WO2023007842A1 WO 2023007842 A1 WO2023007842 A1 WO 2023007842A1 JP 2022014055 W JP2022014055 W JP 2022014055W WO 2023007842 A1 WO2023007842 A1 WO 2023007842A1
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- WO
- WIPO (PCT)
- Prior art keywords
- link mechanism
- cable
- swinging
- arm
- vehicle body
- Prior art date
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- 230000007246 mechanism Effects 0.000 claims abstract description 127
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 230000008859 change Effects 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims description 36
- 230000035945 sensitivity Effects 0.000 claims description 19
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 6
- 244000145845 chattering Species 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003971 tillage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
- A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
- A01B59/042—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor having pulling means arranged on the rear part of the tractor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
- A01B59/06—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors
- A01B59/066—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle (e.g. three-point hitches)
- A01B59/067—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle (e.g. three-point hitches) the lower arms being lifted or lowered by power actuator means internally incorporated in the tractor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/1006—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means the hydraulic or pneumatic means structurally belonging to the tractor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements
- A01B63/112—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to control draught load, i.e. tractive force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D49/00—Tractors
- B62D49/06—Tractors adapted for multi-purpose use
Definitions
- the present invention relates to a tractor equipped with a three-point link mechanism that mounts a work device so that it can be raised and lowered.
- the tractor is configured to perform plowing work or the like with a working device such as a plow attached to a three-point link mechanism, and converts a change in traction load acting on the working device during work into a lifting operation amount.
- a mechanical linkage unit for draft control that is transmitted to the lift drive unit.
- the entire mechanical linkage unit is provided in a state of being biased to one side in the left-right direction of the vehicle body, and the operation cable extends toward the rear side of the vehicle body and is curved in an arc shape. , extend back toward the front side of the vehicle body and are connected to the relay link mechanism.
- the tractor is configured to perform plowing work or the like with a working device such as a plow attached to a three-point link mechanism, and converts a change in traction load acting on the working device during work into a lifting operation amount.
- a mechanical linkage unit for draft control that is transmitted to the lift drive unit.
- the entire mechanical linkage unit is provided in a state of being biased to one side in the left-right direction of the vehicle body, and the operation cable extends toward the rear side of the vehicle body and is curved in an arc shape. , extend back toward the front side of the vehicle body and are connected to the relay link mechanism.
- the tractor is configured to perform plowing work or the like with a working device such as a plow attached to a three-point link mechanism, and converts a change in traction load acting on the working device during work into a lifting operation amount.
- a mechanical linkage unit for draft control that feeds into the hydraulic lift drive unit.
- a mechanical linkage unit that includes an operating link mechanism configured by linking a plurality of links (see, for example, Patent Document 2).
- the operating link mechanism is configured to be displaced toward the front side of the fuselage with respect to the lift arm.
- the operation cable since the operation cable is routed in such a manner that it extends toward the rear side of the vehicle body, then curves and then extends back toward the front side of the vehicle body, the operation cable bends with a small radius of curvature. If the cable is routed in such a state, excessive force will be applied to the bending portion with a small radius of curvature when the cable is pushed or pulled, and there is a risk that changes in traction load cannot be accurately transmitted by the operation cable. there were.
- a solution for the problem 1 is as follows.
- a tractor according to the present invention is characterized by a vehicle body frame, a three-point link mechanism that is vertically swingably connected to the rear portion of the vehicle body and to which a working device can be attached, and an elevation drive unit that drives the three-point link mechanism up and down.
- a load detecting member that swings in response to a pulling load of the working device when the working device performs ground work while being towed by the vehicle body; a first link mechanism provided on one side in the left-right direction of the vehicle body frame in the mechanical linkage unit and interlocked with the load detecting member; A second link mechanism provided on the other direction side and interlocked with the elevation drive unit, and an operation cable interlocking the first link mechanism and the second link mechanism.
- the configuration is simple, chattering does not occur, and smooth transmission is facilitated.
- the amount of change in swinging of the load detection member that swings according to the traction load is transmitted from the first link mechanism to the second link mechanism via the operation cable, and is transmitted from the second link mechanism to the elevation drive unit.
- the first link mechanism is provided on one side of the body frame in the left-right direction
- the second link mechanism is provided on the other side of the body frame in the left-right direction. The parts are spaced apart in the left and right direction.
- the operation cable is provided in a state in which it largely detours from one side in the left-right direction of the vehicle body frame toward the other side in the left-right direction, so that it is bent in a large turning state with a large radius of curvature. Then, the interlocking operation of the operation cables can be performed smoothly without difficulty.
- the first link mechanism includes a swing operation member that swings in conjunction with swing of the load detection member around a swing axis different from the swing axis of the load detection member. It is preferable that an end portion of the operation cable on the side of the load detection member is connected to the swing operation member.
- the operating cable is not restricted by the manner of swinging displacement of the load detecting member. It is possible to set so that the operation of the operation cable associated with the operation can be performed satisfactorily.
- the operation cable extends vertically from the connecting point at each of the connecting point to the first link mechanism and the connecting point to the second link mechanism.
- the operation cable extends from a connecting point to the first link mechanism to a connecting point to the second link mechanism through a region on the rear side of the vehicle body frame.
- the operation cable passes through the area on the rear side of the vehicle body frame, it can be routed along the vehicle body frame. can hold.
- a tractor according to the present invention is characterized by a vehicle body frame, a three-point link mechanism that is vertically swingably connected to the rear portion of the vehicle body and to which a working device can be attached, and an elevation drive unit that drives the three-point link mechanism up and down.
- a load detecting member that swings in response to a pulling load of the working device when the working device performs ground work while being towed by the vehicle body;
- a transmission mechanical linkage unit a transmission case positioned at the rear of the vehicle body frame, and a PTO shaft provided in a state of protruding rearward from the rear of the transmission case and capable of outputting power to be transmitted to the working device.
- the mechanical linkage unit is provided with an operation cable that is linked according to the amount of swinging of the load detection member, the operation cable extends downward from a position higher than the PTO shaft, and The point is that it passes below the PTO shaft and extends to a position higher than the PTO shaft.
- the configuration is simple, and chattering does not occur, making smooth transmission easy.
- the operation cable extends downward from a position higher than the PTO shaft, passes below the PTO shaft, and extends to a position higher than the PTO shaft.
- the PTO shaft is provided at a low position corresponding to the working device in order to output power to the working device.
- the operation cable By extending the operation cable in this way, it is provided in a state in which it detours greatly by passing through the region on the lower side of the PTO shaft, and is in a state in which it is bent in a large turning state with a large radius of curvature. Then, the operation of the operation cable can be performed smoothly without difficulty.
- the operation cable is routed along the rear wall of the transmission case, a locking member is provided at a portion of the rear wall corresponding to a region on the lower side of the PTO shaft, and the operation cable is preferably locked and held by the locking member.
- the operation cable is provided along the rear wall of the transmission case and is locked and held by the locking member on the lower side of the PTO shaft. It can be held in a stable posture along the rear wall of the mission case without extending or swinging freely.
- the operation cable is provided such that the end portion of the operation cable on the side of the elevation drive unit is positioned forward of the rear wall of the transmission case.
- the operation cable on the side of the lift drive unit since the end of the operation cable on the side of the lift drive unit is located on the front side of the rear wall, the operation cable extends toward the front side along the rear wall, so that it is easy to avoid overhanging the rear side. .
- the load detection member side end of the operation cable is located on one side in the left-right direction of the mission case, and the elevation drive unit side end of the operation cable is It is preferable that it is provided so as to be positioned on the other side in the left-right direction of the transmission case.
- the operation cable is provided such that an end portion of the operation cable on the load detection member side and an end portion of the operation cable on the elevator drive unit side extend in the vertical direction. and is suitable.
- the operation cable can be prevented from protruding in the longitudinal direction of the vehicle body, and the possibility of the operation cable coming into contact with the lift arm or the three-point link mechanism is reduced, and the work device can be smoothly moved up and down. can.
- a tractor according to the present invention is characterized by a three-point link mechanism that is vertically swingably connected to a rear portion of a vehicle body and to which a working device can be attached, a lifting drive unit that drives the three-point link mechanism to move up and down, and the working unit.
- a load detection member that swings according to the traction load of the work device when the device performs ground work while being towed by the vehicle body; and the mechanical linkage unit is provided with an operation cable that interlocks according to the swing amount of the load detection member, and the operation cable is an upper end portion of the operation cable on the load detection member side. and the lower end of the operation cable on the elevator drive unit side extends in the vertical direction, and the lower end is located forward of the upper end.
- the structure is simpler than that of connecting a plurality of links, and chattering does not occur. It is easy to perform smooth transmission without
- the operation cable extends in the vertical direction at the upper end on the load detection member side and the lower end on the elevation drive unit side.
- the structure extending along the vertical direction includes not only the vertical direction or a direction close to the vertical direction, but also a state of being slightly inclined. Since the operation cable is provided such that the lower end is positioned forward of the upper end, the entire operation cable passes through the front side of the vehicle body rather than the upper end.
- the operation cable can be prevented from protruding toward the rear side of the vehicle body, and there is little risk of contact with the three-point link mechanism or the like located on the rear side of the vehicle body, and the work device can be smoothly moved up and down.
- the mechanical linkage unit is provided with a swinging operation member that swings in conjunction with swinging of the load detecting member around a swinging axis different from the swinging axis of the load detecting member.
- the upper end of the operation cable is connected to the swinging operation member, and the swinging operation member swings up and down across a horizontal posture as the operation cable extending along the vertical direction is operated. It is preferable to be configured to
- the operating cable is not restricted by the manner of swinging displacement of the load detecting member. It is possible to set so that the operation of the operation cable associated with the operation can be performed satisfactorily.
- the swing operation member When the swing operation member is swing-operated in accordance with the operation of the operation cable, the swing operation member swings up and down across the horizontal posture. Less horizontal deflection. As a result, the sliding portion (inner cable) and the fixed portion (outer cable) do not strongly rub against each other at the portion where the outer peripheral portion (outer cable) on the upper side of the operation cable is supported, and there is little risk of wear.
- the mechanical linkage unit is provided with a first relay arm to which the downstream end of the operation cable is connected, and the first relay arm is a portion of the operation cable extending along the vertical direction. It is preferable to be configured so that it swings up and down across the horizontal posture in accordance with the operation.
- the first relay arm when the first relay arm is operated to swing in accordance with the operation of the operation cable, the first relay arm swings up and down across the horizontal posture. There is little swing width in the horizontal direction at the connection point of . As a result, the sliding portion (inner cable) and the fixed portion (outer cable) do not rub against each other strongly at the portion where the outer peripheral portion (outer cable) on the downstream side of the operation cable is supported, and there is little risk of wear.
- a second relay arm that swings integrally with the first relay arm, and an interlocking member that is interlocked with the second relay arm are provided, and the second relay arm is provided with the operation arm.
- the second relay arm is configured to swing back and forth in accordance with the operation of the cable, and configured to move the interlocking member back and forth to transmit a change in swing of the load detection member to the elevation drive unit.
- the interlocking member can be arranged along the front-back direction while the operation cable is vertically moved, and the mechanical linking unit can be made compact in the up-down direction.
- the mechanical linkage unit is provided with a swinging operation member that swings in conjunction with swinging of the load detecting member around a swinging axis different from the swinging axis of the load detecting member.
- a support frame supporting the load detection member so as to be swingable is provided in a state of being supported by the vehicle body frame; and a support member supporting the swing operation member so as to be swingable is supported by the support frame.
- the operation cable includes an inner cable and an outer cable that externally inserts and supports the inner cable in a slidable manner, and the upper end of the outer cable is positionally fixed by the support member. It is preferably supported in a state.
- the support member is supported by the support frame that is firmly provided, and the support member can stably support the swing support member and the upper end of the outer cable.
- the support member for supporting the swing support member is used to support the upper end of the outer cable, there is no need to provide a dedicated member for supporting the outer cable, and the members can be shared. can be simplified.
- the operation cable includes an inner cable and an outer cable that externally inserts and supports the inner cable in a slidable manner, and the bracket that supports the lower end of the outer cable is attached to the vehicle body frame. It is preferable that it is provided in a state of being supported by.
- the downstream end of the outer cable can be stably supported by the vehicle body frame via the bracket.
- the tractor according to the present invention is characterized by a three-point link mechanism that is vertically swingably connected to the rear part of the vehicle body and to which a working device can be attached, a lift arm that can be operated to move the three-point link mechanism up and down, and the lift.
- a lifting drive unit that drives an arm up and down;
- a load detection member that swings according to a pulling load of the work device when the work device performs ground work while being towed by the vehicle body; and swinging of the load detection member.
- the elevation drive unit includes an actuator; and a control unit that controls operation of the actuator;
- the mechanical linkage unit includes the An operation link mechanism is provided to operate the control unit by operating in response to a change in the swing motion of the load detection member, and the operation link mechanism is provided in a state in which it passes through a lateral portion of the lift arm.
- the present invention it is possible to transmit changes in swinging motion of the load detection member to the control unit via the mechanical linkage unit, and when the towing load is large, the working device can be lifted to reduce the load. Further, since the operating link mechanism in the mechanical linkage unit is provided so as to pass through the side portion of the lift arm, the lift arm and the operating link mechanism overlap each other when viewed from the side. In other words, even if the operating link mechanism is long in the front-rear direction, the operating link can be arranged by effectively utilizing the empty space on the side of the lift arm, so that the overall arrangement can be made compact in the front-rear direction. can.
- a protective frame is provided at the rear portion of the vehicle body, the protective frame is provided with left and right leg portions positioned laterally of the lift arm, and the operating link mechanism is connected to the lift arm. It is preferable that it is provided so as to pass between the legs.
- the operation link mechanism can be protected from the lateral outside by the leg portion, and damage to the operation link mechanism can be prevented.
- the operation link mechanism includes a swing arm on the upper side that swings in conjunction with a change in the swing of the load detection member, and a swing arm on the upper side that is connected to the swing arm on the upper side.
- a front-rear rod that is pushed and pulled in accordance with the swinging motion of the swing arm, and a lower-side rocker that is connected to the lower-side portion of the rod and rocks in conjunction with the push-pull operation of the rod.
- a moving arm is preferably provided.
- a screw-type space adjusting portion capable of changing and adjusting the space between the connecting point between the rod and the swing arm on the upper side and the connecting point between the rod and the swing arm on the lower side.
- a screw-type space adjusting portion capable of changing and adjusting the space between the connecting point between the rod and the swing arm on the upper side and the connecting point between the rod and the swing arm on the lower side.
- a horizontal support shaft extending in a horizontal direction and a second swing arm that swings integrally with the upper swing arm around the axis of the horizontal support shaft are provided.
- a swing arm is configured to transmit the change in swing transmitted to the second swing arm to the rod, and includes a support bracket that rotatably supports the horizontal support shaft; It is preferable that a coil spring is provided in an inserted state and biases the swing arm on the upper side to the lowering operation side.
- the horizontal support shaft provided for swingably supporting the swing arm on the upper side and the second swing arm is effectively used to bias the swing arm toward the lowering operation side.
- a coil spring is provided as a means.
- a coil spring can be housed in a more compact shape than a coil spring, making it possible to reduce the size of the entire operating link mechanism.
- the support bracket is formed with an elongated hole along the longitudinal direction of the vehicle body, and the lateral support shaft is inserted through the elongated hole so as to be rotatable and movable in the longitudinal direction.
- a manually operable adjustment lever supported and provided on the front side of the vehicle body of the lateral support shaft; and a band-plate-like operation member connecting the adjustment lever and the lateral support shaft, is operated to change the position of the horizontal support shaft in the front-rear direction so that the operating sensitivity of the load detection member in the mechanical link unit to changes in rocking movement can be changed and adjusted, and the operation member is configured to A rear portion of the operation member to which the lateral support shaft is connected is positioned outward in the vehicle width direction, and a front portion of the operation member to which the adjustment lever is connected is positioned inward in the vehicle width direction. It is preferable that it is formed by bending as shown in FIG.
- the operation member for transmitting the operation of the adjustment lever to the horizontal support shaft is formed in the form of a band plate, a complicated connection structure such as a universal joint is not required as compared with the case of using a rod, for example. , can be handled with a simple connection structure.
- the rear portion of the operation member supports the lateral support shaft from the outer side of the width of the vehicle body, so that the lateral support shaft can be protected from ridges and field soil.
- the coil spring is provided in a state of being positioned inward in the vehicle width direction of the rear portion of the operation member, and the adjustment lever is positioned inward of the vehicle width direction of the front portion of the operation member. It is preferable that it is provided in a state of being located on the direction outward side.
- the operation link mechanism can be made compact in the lateral direction of the vehicle body. can be planned.
- a highly wear-resistant washer is provided at the sliding portion of the operating member and the support bracket.
- the swinging arm on the upper side, the second swinging arm, or the horizontal support shaft rotate frequently during driving work.
- wear may occur between the rotating member and the operating member, or between the rotating member and the support bracket. Therefore, according to this configuration, by providing a highly wear-resistant washer at the sliding portion, the above-described wear can be prevented.
- FIG. 1 is a side view of a tractor;
- FIG. FIG. 4 is a right side view of the essential parts showing the configuration of the elevation drive unit and the mechanical linkage unit;
- FIG. 4 is a plan view of the essential parts showing the configuration of the lift drive unit and the mechanical linkage unit;
- FIG. 4 is a rear view of the essential parts showing the configurations of the lift drive unit and the mechanical linkage unit;
- FIG. 4 is a left side view of the essential parts showing the configurations of the lift drive unit and the mechanical linkage unit;
- FIG. 4 is an exploded perspective view of a main part showing the configuration of the mechanical linkage unit;
- FIG. 4 is an exploded perspective view of a main part showing the configuration of the mechanical linkage unit;
- FIG. 4 is an exploded perspective view of a main part showing the configuration of the mechanical linkage unit;
- FIG. 4 is an exploded perspective view of a main part showing the configuration of the mechanical linkage unit;
- FIG. 4 is an exploded perspective view of a main
- FIG. 4 is a cross-sectional plan view of a main part showing the configuration of the mechanical linkage unit;
- FIG. 4 is an exploded perspective view showing a valve operating mechanism;
- 4 is a linkage system diagram showing a linkage configuration of a mechanical linkage unit;
- the direction indicated by the arrow “F” is the front side of the fuselage
- the direction indicated by the arrow “B” is the rear side of the fuselage
- the direction indicated by the arrow “L” is the left side of the fuselage
- the direction indicated by the arrow “L” is the left side of the fuselage.
- a pair of left and right front wheels 1 are pivotally supported by a front frame 3 arranged in the front part of the vehicle body, and positioned laterally outside of the front frame 3 of the vehicle body.
- a clutch housing 5 is arranged between the front frame 3 and the intermediate frame 4 .
- a transmission case 6 is connected to the rear end of the intermediate frame 4 .
- the clutch housing 5 and transmission case 6 are also used as a body frame of the tractor. That is, the front frame 3, the intermediate frame 4, the clutch housing 5, the transmission case 6, and the like are integrally connected to form the body frame SF of the tractor.
- a rear support case 10 is provided above the mission case 6 to support an elevation drive unit 9, which will be described later.
- the engine E is mounted and supported on the rear part of the front frame 3, and the clutch housing 5 is connected to the lower rear end of the engine E.
- a pair of left and right rear wheels 2 are pivotally supported by the transmission case 6 so as to be located outside the left and right sides of the transmission case 6 .
- the clutch housing 5 contains a main clutch and the like
- the intermediate frame 4 has a transmission shaft
- the mission case 6 contains a main transmission, an auxiliary transmission, and the like.
- the power of the engine E is transmitted to a pair of left and right front wheels 1 and a pair of left and right rear wheels 2 via a main clutch, a transmission shaft, a main transmission, an auxiliary transmission, and the like.
- a PTO shaft 13 capable of outputting power to be transmitted to the work device 12 is provided in a state of protruding rearward from the rear portion of the transmission case 6 .
- the operation unit 7 is arranged at the rear part of the vehicle body and is configured so that an operator can board it.
- the driving section 7 is provided with a steering wheel 14 and a driver's seat 15 .
- Rear fenders 8 are arranged on the left and right sides of the driver's seat 15 and outside the vehicle body, and the rear fenders 8 cover the left and right rear wheels 2 from above.
- the transmission case 6 is arranged below the driver's seat 15 .
- a front-side protection frame 16 is provided in the front-rear intermediate portion of the vehicle body, standing up from both left and right sides of the intermediate frame 4 and extending so as to detour upward.
- a rear protection frame 17 is provided that is positioned behind the driver's seat 15 and rises from the left and right lateral sides of the transmission case 6 and extends so as to detour upward. It is The rear protective frame 17 has left and right legs 18 raised from the transmission case 6 and an upper arch 19, and is lower than the front protective frame 16. As shown in FIG.
- a three-point link mechanism 20 is connected to the rear part of the transmission case 6 so as to be able to swing vertically.
- the three-point link mechanism 20 includes left and right lower links 20a and a left and right central top link 20b, and supports the working device 12 so as to be able to move up and down.
- the working device 12 shown in FIG. 1 is a plow.
- a traction-type working device 12 such as a disk harrow, a cultivator, a subsoiler, and a rotary can be attached, but the working device 12 is not limited to this.
- Left and right lift arms 25 are provided for suspending and supporting the left and right lower links 20 a of the three-point link mechanism 20 via the left and right lift rods 23 .
- a hydraulic lifting drive unit 9 that drives the three-point link mechanism 20 up and down while the working device 12 is connected, and when the working device 12 is towed by the vehicle body and performs ground work, the traction load of the working device 12 is increased.
- a swinging load detection member 21 and a mechanical linkage unit 22 for transmitting a swing change of the load detection member 21 to the elevation drive unit 9 are provided.
- the elevation drive unit 9 includes a hydraulic cylinder 26 as an actuator for vertically swinging the left and right lift arms 25 , a hydraulic control valve 27 as a control unit for controlling the supply and discharge of hydraulic oil to and from the hydraulic cylinder 26 , and the work device 12 .
- a height setting lever 28 for setting the control target height of , a valve operating mechanism 29 for interlocking the spool 27A of the hydraulic control valve 27 by operating the height setting lever 28 and operating the mechanical linkage unit 22, and the spool 27A are provided with a feedback link mechanism 30 for interlocking with the left and right lift arms 25, and the like.
- the hydraulic control valve 27 is internally provided with biasing means (not shown) that biases the spool 27A back to the lowered position on the front side of the vehicle body.
- the height setting lever 28 is supported by the rear support case 10 so as to be able to swing back and forth around the axis of a lateral lever support shaft 31 , and extends above the rear fender 8 on the right side of the driver's seat 15 .
- the valve operating mechanism 29 includes an operating arm 32 that can be swung by operating the height setting lever 28 and the mechanical linkage unit 22, and the spool 27A of the hydraulic control valve 27.
- a balance arm 33 supported so as to be able to swing back and forth around a core, and an operation member 34 that is swung as the operation arm 32 swings and is movably locked to one end of the balance arm 33, and the like. I have.
- the valve operating mechanism 29 moves the spool 27A of the hydraulic control valve 27 from the neutral position to the raised position or the lowered position in conjunction with the swinging operation of the height setting lever 28. Also, the valve operating mechanism 29 moves the spool 27A according to the operation of the mechanical linkage unit 22 .
- the feedback link mechanism 30 includes a link 35 extending from the left lift arm 25 toward the front of the vehicle body, an operation member 36 engaging the other end of the balance arm 33 via the link 35, and the like.
- the feedback link mechanism 30 moves the spool 27A of the hydraulic control valve 27 from the raised or lowered position to the neutral position in conjunction with the arrival.
- a long hole 32a is formed in the operation arm 32 along the swinging direction.
- An interlocking portion 28a extends forwardly and downwardly from the height setting lever 28, and a pin 28b is provided in the interlocking portion 28a to engage with the elongated hole 32a.
- the long hole 32a allows the rearward swinging, and lifts the lift arm 25. can be operated.
- the load detecting member 21 is mounted on a rear frame 37 fixed to the rear end of the rear support case 10 so as to be swingably displaceable in the front-rear direction via a horizontal support shaft 38 at the bottom. Supported.
- the load detecting member 21 is urged to swing toward the rear of the vehicle body by a coil spring 39 provided on the front side. Further, the load detection member 21 is restricted in its forward and backward swinging range by a restriction mechanism including an elongated hole 40 formed in the rear frame 37 and a pin 41 provided in the load detection member 21 .
- the front end of the top link 20b of the three-point link mechanism 20 is connected to the load detecting member 21 via a connecting pin 42.
- the front ends of the left and right lower links 20 a are connected to left and right brackets 43 provided at the rear end of the transmission case 6 via left and right connecting pins 44 . Due to this connection structure, the traction load during tillage work acts on the load detection member 21 via the top link 20b.
- the load detection member 21 When the traction load increases, the load detection member 21 is pivotally displaced from the reference posture (standby state) toward the front of the vehicle body against the biasing force of the coil spring 39 in conjunction with the increase of the traction load, and , in conjunction with the reduction of the towing load, the urging force of the coil spring 39 swings toward the rear side of the vehicle body and returns to the reference posture.
- the mechanical linkage unit 22 is configured to transmit the swinging displacement of the load detection member 21 due to the traction load to the operation arm 32 of the valve operation mechanism 29 .
- a first link mechanism 45 provided on the left side of the body frame SF as one side in the left-right direction of the body frame SF and interlocked with the load detecting member 21, and a left and right body frame SF.
- a second link mechanism 46 as an operation link mechanism provided on the right side as the other direction side and interlocked with the elevation drive unit 9, and an operation cable 47 interlocking the first link mechanism 45 and the second link mechanism 46. and is provided.
- the first link mechanism 45 will be explained. As shown in FIGS. 5, 6 and 10, the first link mechanism 45 includes an interlocking member 48 provided on the upper left side of the load detecting member 21 and swinging in conjunction with the load detecting member 21; A swing operating member 50 is supported swingably around a horizontal axis by a bracket 49 as a support member fixed to the frame 37 .
- the interlocking member 48 is formed in a strip shape elongated in the vertical direction, and the upper and lower intermediate portions are supported by the load detection member 21 so as to be swingable around the axis of the horizontal support shaft 48A.
- a receiving member 51 is provided at a portion of the load detecting member 21 on the rear side of the swinging fulcrum of the interlocking member 48 , and when the load detecting member 21 swings forward, it is received by the receiving member 51 and the interlocking member 48 moves. It is configured to swing forward in conjunction with it.
- the rocking operation member 50 has an upper arm portion 52 and a lower arm portion 53, and is formed of a plate that is substantially L-shaped when viewed from the side.
- the rocking operation member 50 is rockably supported by the bracket 49 via a lateral support shaft 55 at its intermediate portion.
- the bracket 49 is connected and fixed to the rear frame 37 .
- a contact roller 56 supported by the lower end portion of the interlocking member 48 is configured to be able to contact the upper arm portion 52 as the interlocking member 48 swings forward, and the swinging end portion of the lower arm portion 53 contacts the roller 56 .
- the ends of the operation cables 47 on the load detection member 21 side are connected.
- the swing operation member 50 is urged to rotate in the direction in which the upper arm portion 52 approaches the interlocking member 48 by a coil spring 57 attached to the support shaft 55 . Accordingly, in the initial state where no traction load is applied, the upper arm portion 52 is in contact with the interlocking member 48 .
- the interlocking member 48 and the upper arm portion 52 swing forward in conjunction with each other, and the lower arm portion 53 swings upward to operate the operation cable 47 . Pull up to operate.
- the lower arm portion 53 is configured to swing up and down across a horizontal posture in accordance with the operation of the operation cable 47 extending along the vertical direction.
- the first link mechanism 45 is provided with a change amount adjusting mechanism 58 that can change the amount of relative displacement of the interlocking member 48 with respect to the swinging displacement of the load detecting member 21 in two steps.
- the change amount adjusting mechanism 58 includes a base member 59 supported by the rear frame 37 so as to be rotatable around the longitudinal axis X, and a grip operation for swinging the base member 59.
- a portion 60 and an operation restricting portion 61 supported by the base member 59 .
- the operation restricting portion 61 is switched between a state in which the interlocking member 48 is moved (the state shown in FIGS. 4 and 5) and a state in which it is out of the movement region. It is possible.
- the second link mechanism 46 will be explained. As shown in FIGS. 2 to 4, 7, and 10, a substantially L-shaped linking member 62 in a side view having one end connected to an operation cable 47 and a linking member 62 other than the linking member 62 are connected to the second link mechanism 46.
- a front-rear pushing/pulling rod 63 as an interlocking member that is connected to the end portion and transmits an operation amount by being pushed/pulled in accordance with the swinging motion of the connecting member 62 , and is connected to the rear end portion of the push/pull rod 63 .
- an operating arm 64 as a swing arm on the lower side that swings in conjunction with pushing and pulling.
- the operating arm 64 is rotatably supported by the operating arm 32 of the valve operating mechanism 29 .
- the second link mechanism 46 is provided so as to pass through the side portion of the lift arm 25 .
- the second link mechanism 46 is provided so as to pass between the right lift arm 25 and the right leg 18 of the rear protection frame 17 .
- the linking member 62 includes a first relay arm 65 to which the downstream end of the operation cable 47 is connected, and a second relay arm 66 that swings integrally with the first relay arm 65. It is formed in an L shape.
- the linking member 62 is supported by a support bracket 68 so as to be swingable around the axis of a horizontal support shaft 67 provided in the intermediate portion.
- the operation cable 47 is connected to the swinging end of the first relay arm 65 , and the front end of the push/pull rod 63 is connected to the swinging end of the second relay arm 66 .
- the push/pull rod 63 is operated to move the operating arm 64 by an operation amount corresponding to the swinging amount of the load detecting member 21. swing.
- the operating arm 64 swings, the operating arm 32 swings.
- an adjustable screw-type spacing is provided to change the distance between the connection point between the push/pull rod 63 and the second relay arm 66 and the connection point between the push/pull rod 63 and the actuating arm 64.
- An adjuster 69 is provided. Specifically, a threaded portion is formed in the front portion of the push/pull rod 63, and this threaded portion is inserted into a columnar connector 70 supported by the second relay arm 66 so as to be rotatable around the horizontal axis. It is provided in a state where
- Nuts 71 are attached to both front and rear portions of the connector 70 in the threaded portion of the push/pull rod 63 .
- the distance between the connection point between the push/pull rod 63 and the second relay arm 66 and the connection point between the push/pull rod 63 and the operating arm 64 is increased. can be changed, and the position can be fixed by tightening with nuts 71 on both sides.
- the rear end portion of the push/pull rod 63 is rotatably connected to the operation arm 64 in a state where it is bent approximately 90 degrees in a plan view.
- a sensitivity adjustment mechanism 72 is provided for adjusting the operating sensitivity when the spool 27A is interlocked with the load detection member 21.
- a sensitivity adjusting mechanism 72 supports a sensitivity adjusting lever 73 provided on the right side of the driver's seat 15, an operating member 74 extending from the sensitivity adjusting lever 73 over a lateral supporting shaft 67 of the linking member 62, and a lateral supporting shaft 67 so as to change the position thereof.
- a vehicle body side support bracket 75 and the like are provided.
- the sensitivity adjustment lever 73 is supported by the rear support case 10 so as to be swingable back and forth about a lever support shaft 31 shared with the height setting lever 28, and extends above the rear fender 8 on the right side of the driver's seat 15. .
- the lever support shaft 31 is provided with a friction holding portion that holds the sensitivity adjustment lever 73 at an arbitrary operating position.
- the support bracket 75 is fixed to the side wall of the rear support case 10 and has a substantially L-shaped shape bent outward in a plan view.
- a longitudinally elongated hole 76 is formed in the outermost vertical surface portion 75a of the support bracket 75 .
- a horizontal support shaft 67 is inserted through the long hole 76 , and the horizontal support shaft 67 is provided movably in the front-rear direction along the long hole 76 .
- the position of the horizontal support shaft 67 is changed back and forth along the long hole 76 .
- the gap between the operating arm 64 and the linking portion 32b of the operating arm 32 is changed, and the operating sensitivity when the spool 27A of the hydraulic control valve 27 is linked with the load detecting member 21 can be adjusted. .
- the linking portion 32b of the operating arm 32 is provided in a substantially U-shape in plan view, and the operating arm 64 is rotatably supported by the support shaft 64a while positioned inside thereof.
- the relative posture (reference posture) between the operating arm 64 and the operating arm 32 in a state where no traction load is applied changes.
- the actuating arm 64 swings from the reference posture in conjunction with the load detecting member 21, the operation arm 32 is activated sensitively and responsively and insensitively in accordance with the change in the reference posture. can be switched.
- a coil spring 77 is provided to rotate and urge the linking member 62 toward the lowering operation side while being externally inserted on the horizontal support shaft 67 .
- the coil spring 77 is provided on the inner side in the left-right direction of the vertical surface portion 75 a of the support bracket 75 .
- the coil spring 77 is configured to rotate and bias the spool 27A of the hydraulic control valve 27 toward the lowered position, that is, the first relay arm 65 upward.
- the operation member 74 is formed in a band-like shape, and is positioned in the middle in such a manner that the front side is positioned inward in the left-right direction and the rear side is positioned inward in the left-right direction. It is formed by bending at.
- the front part to which the sensitivity adjustment lever 73 is connected is located on the inner side in the left-right direction and is oriented along the front-rear direction
- the rear part to which the horizontal support shaft 67 is connected is positioned on the outer side in the left-right direction. It is positioned and has a posture along the front-rear direction.
- An intermediate portion between the front portion side portion and the rear portion side portion has an oblique attitude toward the inner side in the left-right direction toward the front portion.
- the operation member 74 is positioned on the laterally outward side of the vertical surface portion 75a of the support bracket 75, is supported by the horizontal support shaft 67, and is positionally held by tightening a nut 78 (see FIG. 8).
- the coil spring 77 is provided so as to be positioned inward in the left-right direction of the rear portion of the operation member 74 .
- the sensitivity adjustment lever 73 is provided so that the base end portion thereof is positioned inward in the left-right direction of the front portion of the operating member 74, and the upper portion thereof is positioned outward in the left-right direction. ing. Therefore, the operation member 74 is provided so as to be positioned on the outer side in the left-right direction of the front portion side portion of the operation member 74 .
- the horizontal support shaft 67 is configured to rotate integrally with the linking member 62 .
- a highly wear-resistant washer 79 is provided at a sliding portion between the operating member 74 and the rotating portion of the support bracket 75 to prevent wear.
- the sensitivity adjustment lever 73 and the height setting lever 28 are arranged at positions close to the left and right in the upper part so that they can be easily operated from the operation unit 7 .
- the base ends of the sensitivity adjustment lever 73 and the height setting lever 28 are separated from each other along the axial direction (horizontal direction) of the lever support shaft 31 .
- a push/pull rod 63 is provided so as to pass through this separated portion.
- the push/pull rod 63 is bent in the middle in the front-to-rear direction so as to pass between the base ends of the sensitivity adjustment lever 73 and the height setting lever 28 .
- the second link mechanism 46 is designed such that each member is arranged rationally so that the width in the left-right direction can be kept as compact as possible.
- the operation cable 47 includes an inner cable 47A and an outer cable 47B for slidably externally inserting and supporting the inner cable 47A.
- the upper end of the operation cable 47 on the side of the load detecting member 21 (hereinafter simply referred to as the upper end), specifically the upper end of the inner cable 47A, serves as the swinging operation member of the first link mechanism 45. 50 is connected to the lower arm portion 53 .
- the downstream end of the operation cable 47 on the elevation drive unit 9 side (hereinafter simply referred to as the downstream end), that is, the downstream end of the inner cable 47A is the first relay of the linking member 62 in the second link mechanism 46. It is connected to arm 65 .
- the lower arm portion 53 of the swinging operation member 50 to which the operation cable 47 is connected and the first relay arm 65 of the linking member 62 are configured to swing vertically with the horizontal posture therebetween, Even if the inner wire 46A slides as the lower arm portion 53 and the first relay arm 65 swing, it is possible to prevent the inner wire 46A from sliding strongly against the end portion of the outer cable 47B and being worn.
- the upper end of the outer cable 47B is supported by an outer receiving member 81 fixed to the bracket 49.
- the bracket 49 is fixedly supported by the rear frame 37 .
- a downstream end of the outer cable 47B is supported by an outer receiving member 82 as a bracket fixedly extending from the transmission case 6 .
- connection portion between the lower end portion of the inner cable 47A and the first relay arm 65 is provided at a position closer to the front side of the vehicle body than the connection portion between the upper end portion of the inner cable 47A and the lower arm portion 53. It is
- the upper side end of the operation cable 47 is provided in a state of extending along the vertical direction. That is, the upstream end of the inner cable 47A and the outer receiving member 81 are provided at positions spaced apart in the vertical direction while substantially overlapping each other in a plan view. Further, the lower end of the operation cable 47 is provided in a state of extending along the vertical direction. That is, the lower end of the inner cable 47A and the outer receiving member 82 are provided at positions spaced apart in the vertical direction while substantially overlapping each other in a plan view.
- the operation cable 47 has an upper end on the load detection member 21 side of the operation cable 47 and a lower end of the operation cable 47 on the elevation drive unit 9 side. , are provided to extend in the vertical direction. Further, as shown in FIGS. 1 and 3, the operation cable 47 is provided in such a manner that the lower end thereof is located forward of the upper end thereof. A downstream end of the operation cable 47 is provided so as to be located on the front side of the vehicle body with respect to the rear wall 6A of the transmission case 6 .
- the operation cable 47 extends downward from a position higher than the PTO shaft 13, passes below the PTO shaft 13, and extends to a position higher than the PTO shaft 13. .
- the operation cable 47 is connected and supported by the outer receiving members 81 and 82 at the upper side end and the lower side end of the PTO shaft 13 respectively, and the middle part is below the PTO shaft 13 . It is routed so as to pass through the area on the side.
- the operation cable 47 is routed along the rear wall 6A of the transmission case 6.
- a locking member 83 is provided at a portion of the rear wall 6A corresponding to the region on the lower side of the PTO shaft 13, and the intermediate portion of the operation cable 47 is locked and held by the locking member 83. As shown in FIG. Therefore, the operation cable 47 is curved with a large radius of curvature from the first link mechanism 45 toward the second link mechanism 46 through the area below the PTO shaft 13 .
- the locking member 83 is provided in an elongated shape whose length in the left-right direction is substantially the same as the left-right width of the rear wall 6A of the transmission case 6. In this way, by locking the lower intermediate portion of the operation cable 47 over a wide range in the left-right direction, the posture can be held in a stable state.
- the operation cable 47 may be configured so as to extend from the connection point to the first link mechanism 45 to the connection point to the second link mechanism 46 through the area below the vehicle body frame SF. It may be configured to be provided in a state of passing above the SF.
- the operation cable 47 may be configured to extend in the front-rear direction from the connection location to the first link mechanism 45 or the connection location to the second link mechanism 46, or may be configured to extend in the left-right direction.
- the mechanical linking units 22 may be provided in a state of gathering on one side in the left-right direction of the body frame SF or on the other side in the left-right direction of the body frame SF instead of distributing them to the left and right.
- the operation cable 47 is routed so as to extend from one side in the left-right direction of the vehicle body and return to the one side in the left-right direction of the vehicle body after the intermediate portion passes through the area below the PTO shaft 13 . Anything is fine.
- the intermediate portion of the operation cable 47 that connects the first link mechanism 45 and the second link mechanism 46 may be routed so as to pass above the PTO shaft 13 .
- the load detection member 21 may be configured to be swingably supported around the upper horizontal support shaft, or may be supported so as to be swingable around the vertical axis.
- an electric actuator such as an electric cylinder or an electric motor may be used instead of the hydraulic cylinder.
- the configuration of the tractor can be modified in various ways. For example, a configuration including a crawler traveling device instead of the left and right rear wheels, or a configuration including a crawler traveling device instead of the left and right front wheels and the left and right rear wheels may be employed.
- An electric configuration including an electric motor instead of the engine may be used, or a hybrid configuration including an engine and an electric motor may be used.
- the pushing/pulling rod 63 is provided by one swinging arm, a support shaft that rotates integrally therewith, and a swinging body that is separate from the swinging arm. may be configured to operate.
- the first relay arm 65 may swing only in a region above the horizontal posture or only in a region below the horizontal posture.
- the upper end of the outer cable 47B may be supported by a separately provided dedicated support member.
- the operation cable 47 may be routed so as to pass above the PTO shaft 13 .
- the push/pull rod may be operated by the rocking arm, the support shaft that rotates integrally therewith, and the second rocking arm that is separate from the rocking arm on the upper side.
- the protective frame 17 on the rear side may not be provided.
- an operation cable that can be pushed and pulled may be used to interlock.
- a screw-type spacing adjustment portion 69 may be provided at the connection point between the push/pull rod 63 and the operating arm 64 . Further, instead of providing the connection point between the push/pull rod 63 and the second relay arm 66 and the connection point between the push/pull rod 63 and the operating arm 64, a turnbuckle mechanism is provided in the middle of the push/pull rod 63. The length of the rod itself may be changed.
- the mechanical linkage unit 22 may be constructed entirely of link members without the operation cable 47 .
- the mechanical linking units 22 may be provided in a state of gathering on one side in the left-right direction of the body frame SF or on the other side in the left-right direction of the body frame SF instead of distributing them to the left and right.
- the operation member 74 may be one in which the rear portion is positioned on the inner side in the left-right direction and the front portion is positioned on the outer side in the left-right direction. They may be provided so as to be located at approximately the same position. Moreover, the operation member 74 may be configured by a rod.
- the configuration may be such that the washer 79 with high wear resistance is not provided.
- the present invention can be applied to a tractor equipped with a three-point link mechanism that mounts a work device so that it can be raised and lowered.
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Abstract
Description
上記トラクタは、プラウ等の作業装置が3点リンク機構に取り付けられた状態で耕起作業等を行うように構成され、作業時に作業装置に作用する牽引負荷の変化を昇降操作量に変換して昇降駆動ユニットに伝えるドラフト制御用の機械式連係ユニットが備えられたものがある。そして、従来では、機械式連係ユニットに牽引負荷の変化を操作ケーブルにより伝達するものがあった(例えば特許文献1参照)。
上記トラクタは、プラウ等の作業装置が3点リンク機構に取り付けられた状態で耕起作業等を行うように構成され、作業時に作業装置に作用する牽引負荷の変化を昇降操作量に変換して昇降駆動ユニットに伝えるドラフト制御用の機械式連係ユニットが備えられたものがある。そして、従来では、機械式連係ユニットが牽引負荷の変化を操作ケーブルにより伝達するものがあった(例えば特許文献1参照)。
上記トラクタは、プラウ等の作業装置が3点リンク機構に取り付けられた状態で耕起作業等を行うように構成され、作業時に作業装置に作用する牽引負荷の変化を昇降操作量に変換して油圧式の昇降駆動ユニットに伝えるドラフト制御用の機械式連係ユニットが備えられたものがある。そして、従来では、機械式連係ユニットとして、複数のリンクを連動連係して構成された操作リンク機構を備えたものがあった(例えば特許文献2参照)。
背景技術1に対応する技術課題は、以下の通りである。
上記従来構成では、牽引負荷の変化が操作ケーブルを介して昇降駆動ユニットに伝えられる構成であるから、例えば、複数のリンクを連結することにより牽引負荷の変化を伝えるものに比べて、構成の簡素化を図れるとともに、チャタリングの発生を防止して、円滑な伝達を行える利点がある。
背景技術2に対応する技術課題は、以下の通りである。
上記従来構成では、牽引負荷の変化が操作ケーブルを介して昇降駆動ユニットに伝えられる構成であるから、例えば、複数のリンクを連動連結することにより牽引負荷の変化を伝えるものに比べて、構成の簡素化を図れるとともに、チャタリングの発生を防止して、円滑な伝達を行える利点がある。
背景技術3に対応する技術課題は、以下の通りである。
上記従来構成では、操作リンク機構がリフトアームに対して機体前方側に位置ずれした状態で設けられるので、リフトアームの前方に操作リンク機構を設けるために配置スペースが必要であり、機体前後方向に沿って車体が大型化するという不利な面があった。
課題1に対応する解決手段は、以下の通りである。
本発明に係るトラクタの特徴構成は、車体フレームと、車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、前記3点リンク機構を昇降駆動する昇降駆動ユニットと、前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、前記負荷検出部材の揺動変化量を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、前記機械式連係ユニットに、前記車体フレームの左右方向一方側に設けられ、前記負荷検出部材に連動連係された第一リンク機構と、前記車体フレームの左右方向他方側に設けられ、前記昇降駆動ユニットに連動連係された第二リンク機構と、前記第一リンク機構と前記第二リンク機構とを連動連係する操作ケーブルと、が備えられている点にある。
課題2に対応する解決手段は、以下の通りである。
本発明に係るトラクタの特徴構成は、車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、前記3点リンク機構を昇降駆動する昇降駆動ユニットと、前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、前記負荷検出部材の揺動変化を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、前記機械式連係ユニットに、前記負荷検出部材の揺動量に応じて連動する操作ケーブルが備えられ、前記操作ケーブルは、前記操作ケーブルにおける前記負荷検出部材側の上手側端部及び前記操作ケーブルにおける前記昇降駆動ユニット側の下手側端部のそれぞれが、上下方向に沿って延びる状態で、かつ、前記下手側端部が前記上手側端部よりも前側に位置する状態で設けられている点にある。
課題3に対応する解決手段は、以下の通りである。
本発明に係るトラクタの特徴構成は、車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、前記3点リンク機構を昇降操作可能なリフトアームと、前記リフトアームを昇降駆動する昇降駆動ユニットと、前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、前記負荷検出部材の揺動変化を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、前記昇降駆動ユニットに、アクチュエータと、前記アクチュエータの作動を制御する制御ユニットと、が備えられ、前記機械式連係ユニットに、前記負荷検出部材の揺動変化に応じて動作して前記制御ユニットを操作する操作リンク機構が備えられ、前記操作リンク機構が前記リフトアームの横側箇所を通過する状態で備えられている点にある。
後部側の保護フレーム17は、ミッションケース6から立ち上げ形成された左右の脚部18と上部のアーチ部19とを有し、前部側の保護フレーム16よりも背低に設けられている。
昇降駆動ユニット9は、左右のリフトアーム25を上下方向に揺動駆動するアクチュエータとしての油圧シリンダ26、油圧シリンダ26の作動油の給排を制御する制御ユニットとしての油圧制御バルブ27、作業装置12の制御目標高さを設定する高さ設定レバー28、高さ設定レバー28の操作及び機械式連係ユニット22の操作により、油圧制御バルブ27のスプール27Aを連動させるバルブ操作機構29、及び、スプール27Aを左右のリフトアーム25に連動させるフィードバックリンク機構30、などを備えている。油圧制御バルブ27は、スプール27Aを車体前方側の下降位置に復帰付勢する付勢手段(図示せず)を内部に備えている。高さ設定レバー28は、横向きのレバー支軸31の軸芯周りで前後揺動可能に後部支持ケース10に支持され、運転座席15の右側方においてリアフェンダ8の上方にまで延びている。
図5及び図6に示すように、負荷検出部材21は、後部支持ケース10の後端に固定された後部フレーム37に、下部の横向きの支軸38を介して前後方向に揺動変位可能に支持されている。負荷検出部材21は前部側に設けられたコイルバネ39によって車体後方に揺動付勢されている。また、負荷検出部材21は、後部フレーム37に形成された長孔40と、負荷検出部材21に設けられたピン41からなる制限機構により前後揺動範囲が制限されている。
機械式連係ユニット22は、負荷検出部材21の牽引負荷による揺動変位を、バルブ操作機構29の操作アーム32に伝えるように構成されている。図4に示すように、機械式連係ユニット22に、車体フレームSFの左右方向一方側としての左側に設けられ、負荷検出部材21に連動連係された第一リンク機構45と、車体フレームSFの左右方向他方側としての右側に設けられ、昇降駆動ユニット9に連動連係された操作リンク機構としての第二リンク機構46と、第一リンク機構45と第二リンク機構46とを連動連係する操作ケーブル47と、が備えられている。
図5、図6及び図10に示すように、第一リンク機構45に、負荷検出部材21の上部の左側箇所に設けられ、負荷検出部材21と連動して揺動する連動部材48と、後部フレーム37に固定の支持部材としてのブラケット49に横軸芯周りで揺動可能に支持された揺動操作部材50と、が備えられている。
図2~図4、図7、図10に示すように、第二リンク機構46に、一端部に操作ケーブル47が連結された側面視で略L字形の連係部材62と、連係部材62の他端部に連結され、連係部材62の揺動に応じて押引き操作されることにより操作量を伝達する連動部材としての前後向きの押引きロッド63と、押引きロッド63の後端部に連結され、押引きに伴って連動して揺動する下手側の揺動アームとしての作動アーム64と、が備えられている。作動アーム64は、バルブ操作機構29における操作アーム32に回動可能に支持されている。
図2,4,6,10に示すように、操作ケーブル47は、インナーケーブル47Aと、インナーケーブル47Aをスライド可能に外挿支持するアウターケーブル47Bと、を備えている。操作ケーブル47の負荷検出部材21側の上手側端部(以下、単に上手側端部という)、具体的には、インナーケーブル47Aの上手側端部は、第一リンク機構45における揺動操作部材50の下側アーム部53に連結されている。操作ケーブル47の昇降駆動ユニット9側の下手側端部(以下、単に下手側端部という)、すなわち、インナーケーブル47Aの下手側端部は、第二リンク機構46における連係部材62の第一中継アーム65に連結されている。
以下、別実施形態を列記する。
6A 後壁
9 昇降駆動ユニット
12 作業装置
13 PTO軸
17 保護フレーム
18 脚部
20 3点リンク機構
21 負荷検出部材
22 機械式連係ユニット
25 リフトアーム
26 油圧シリンダ(アクチュエータ)
27 油圧制御バルブ(制御ユニット)
45 第一リンク機構
46 第二リンク機構(操作リンク機構)
47 操作ケーブル
47A インナーケーブル
47B アウターケーブル
49 支持部材
50 揺動操作部材
63 ロッド(連動部材)
64 下手側の揺動アーム
65 第一中継アーム(第二揺動アーム)
66 第二中継アーム(上手側の揺動アーム)
67 横向き支軸
68 支持ブラケット
73 調節レバー
74 操作部材
76 長孔
77 巻きバネ
79 座金
82 ブラケット
83 係止部材
SF 車体フレーム
Claims (23)
- 車体フレームと、
車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、
前記3点リンク機構を昇降駆動する昇降駆動ユニットと、
前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、
前記負荷検出部材の揺動変化量を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、
前記機械式連係ユニットに、前記車体フレームの左右方向一方側に設けられ、前記負荷検出部材に連動連係された第一リンク機構と、前記車体フレームの左右方向他方側に設けられ、前記昇降駆動ユニットに連動連係された第二リンク機構と、前記第一リンク機構と前記第二リンク機構とを連動連係する操作ケーブルと、が備えられているトラクタ。 - 前記第一リンク機構に、前記負荷検出部材の揺動軸芯と異なる揺動軸芯周りで前記負荷検出部材の揺動に伴って連動して揺動する揺動操作部材が備えられ、
前記操作ケーブルの前記負荷検出部材側の端部が前記揺動操作部材に連結されている請求項1に記載のトラクタ。 - 前記操作ケーブルは、前記第一リンク機構に対する連結箇所及び前記第二リンク機構に対する連結箇所のそれぞれにおいて、被連結箇所から上下方向に沿って延びている請求項1または2に記載のトラクタ。
- 前記操作ケーブルが、前記第一リンク機構に対する連結箇所から前記車体フレームの後側の領域を通過して前記第二リンク機構に対する連結箇所に亘っている請求項1から3のいずれか一項に記載のトラクタ。
- 車体フレームと、
車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、
前記3点リンク機構を昇降駆動する昇降駆動ユニットと、
前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、
前記負荷検出部材の揺動変化量を前記昇降駆動ユニットに伝える機械式連係ユニットと、
前記車体フレームの後部に位置するミッションケースと、
前記ミッションケースの後部から後方に突出する状態で設けられ、前記作業装置に伝達する動力を出力可能なPTO軸と、が備えられ、
前記機械式連係ユニットに、前記負荷検出部材の揺動量に応じて連動する操作ケーブルが備えられ、
前記操作ケーブルは、前記PTO軸よりも高い位置から下方に延ばされ、かつ、前記PTO軸の下方を通過して前記PTO軸よりも高い位置まで延ばされているトラクタ。 - 前記操作ケーブルが前記ミッションケースの後壁に沿って配索され、
前記後壁のうち前記PTO軸の下方側の領域に対応する箇所に係止部材が備えられ、
前記操作ケーブルの中間部が前記係止部材により係止保持されている請求項5に記載のトラクタ。 - 前記操作ケーブルは、前記操作ケーブルにおける前記昇降駆動ユニット側の端部が、前記ミッションケースの前記後壁よりも前側に位置する状態で設けられている請求項6に記載のトラクタ。
- 前記操作ケーブルは、前記操作ケーブルにおける前記負荷検出部材側の端部が前記ミッションケースの左右方向一方側に位置し、かつ、前記操作ケーブルにおける前記昇降駆動ユニット側の端部が前記ミッションケースの左右方向他方側に位置する状態で設けられている請求項5から7のいずれか一項に記載のトラクタ。
- 前記操作ケーブルは、前記操作ケーブルにおける前記負荷検出部材側の端部及び前記操作ケーブルにおける前記昇降駆動ユニット側の端部のそれぞれが上下方向に沿って延びる状態で設けられている請求項5から8のいずれか一項に記載のトラクタ。
- 車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、
前記3点リンク機構を昇降駆動する昇降駆動ユニットと、
前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、
前記負荷検出部材の揺動変化を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、
前記機械式連係ユニットに、前記負荷検出部材の揺動量に応じて連動する操作ケーブルが備えられ、
前記操作ケーブルは、前記操作ケーブルにおける前記負荷検出部材側の上手側端部及び前記操作ケーブルにおける前記昇降駆動ユニット側の下手側端部のそれぞれが、上下方向に沿って延びる状態で、かつ、前記下手側端部が前記上手側端部よりも前側に位置する状態で設けられているトラクタ。 - 前記機械式連係ユニットに、前記負荷検出部材の揺動軸芯と異なる揺動軸芯周りで前記負荷検出部材の揺動と連動して揺動する揺動操作部材が備えられ、
前記操作ケーブルの前記上手側端部が前記揺動操作部材に連結され、
前記揺動操作部材は、上下方向に沿って延びる前記操作ケーブルの操作に伴って水平姿勢を挟んで上下に揺動するように構成されている請求項10に記載のトラクタ。 - 前記機械式連係ユニットに、前記操作ケーブルにおける前記下手側端部が連結される第一中継アームが備えられ、
前記第一中継アームは、上下方向に沿って延びる前記操作ケーブルの操作に伴って水平姿勢を挟んで上下に揺動するように構成されている請求項10または11に記載のトラクタ。 - 前記第一中継アームと一体的に揺動する第二中継アームと、
前記第二中継アームに連動連係された連動部材と、が備えられ、
前記第二中継アームは、前記操作ケーブルの操作に伴って前後に揺動するように構成され、且つ、前記連動部材を前後に移動させて前記負荷検出部材の揺動変化を前記昇降駆動ユニットに伝えるように構成されている請求項12に記載のトラクタ。 - 前記機械式連係ユニットに、前記負荷検出部材の揺動軸芯と異なる揺動軸芯周りで前記負荷検出部材の揺動と連動して揺動する揺動操作部材が備えられ、
前記負荷検出部材を揺動可能に支持する支持フレームが、車体フレームに支持される状態で備えられ、
前記揺動操作部材を揺動可能に支持する支持部材が、前記支持フレームに支持される状態で設けられ、
前記操作ケーブルに、インナーケーブルと、前記インナーケーブルをスライド可能に外挿支持するアウターケーブルと、が備えられ、
前記アウターケーブルの上手側の端部が、前記支持部材により位置固定状態で支持されている請求項10から13のいずれか一項に記載のトラクタ。 - 前記操作ケーブルに、インナーケーブルと、前記インナーケーブルをスライド可能に外挿支持するアウターケーブルと、が備えられ、
前記アウターケーブルの下手側の端部を支持するブラケットが、車体フレームに支持される状態で備えられている請求項10から14のいずれか一項に記載のトラクタ。 - 車体の後部に上下揺動可能に連結され、作業装置を取り付け可能な3点リンク機構と、
前記3点リンク機構を昇降操作可能なリフトアームと、
前記リフトアームを昇降駆動する昇降駆動ユニットと、
前記作業装置が前記車体に牽引されながら対地作業を行う場合に前記作業装置の牽引負荷に応じて揺動する負荷検出部材と、
前記負荷検出部材の揺動変化を前記昇降駆動ユニットに伝える機械式連係ユニットと、が備えられ、
前記昇降駆動ユニットに、アクチュエータと、前記アクチュエータの作動を制御する制御ユニットと、が備えられ、
前記機械式連係ユニットに、前記負荷検出部材の揺動変化に応じて動作して前記制御ユニットを操作する操作リンク機構が備えられ、
前記操作リンク機構が前記リフトアームの横側箇所を通過する状態で備えられているトラクタ。 - 前記車体の後部に保護フレームが備えられ、
前記保護フレームに、前記リフトアームの横側方に位置する状態で左右の脚部が備えられ、
前記操作リンク機構が前記リフトアームと前記脚部との間を通過する状態で備えられている請求項16に記載のトラクタ。 - 前記操作リンク機構に、前記負荷検出部材の揺動変化に応じて連動して揺動する上手側の揺動アームと、前記上手側の揺動アームに連結され、前記上手側の揺動アームの揺動に応じて押引き操作される前後向きのロッドと、前記ロッドの下手側部分に連結され、前記ロッドの押引き操作に伴って連動して揺動する下手側の揺動アームと、が備えられている請求項16または17に記載のトラクタ。
- 前記ロッドと前記上手側の揺動アームとの連結点と、前記ロッドと前記下手側の揺動アームとの連結点までの間隔を変更調節可能なネジ式の間隔調節部が備えられている請求項18に記載のトラクタ。
- 横方向に延びる横向き支軸と、
前記横向き支軸の軸芯周りで前記上手側の揺動アームと一体的に揺動する第二揺動アームと、が備えられ、
前記上手側の揺動アームが、前記第二揺動アームに伝えられた前記揺動変化を前記ロッドに伝えるように構成され、
前記横向き支軸を回動可能に支持する支持ブラケットと、前記横向き支軸に外挿される状態で設けられ、前記上手側の揺動アームを下降操作側に回動付勢する巻きバネと、が備えられている請求項18または19に記載のトラクタ。 - 前記支持ブラケットに、車体前後方向に沿う長孔が形成され、
前記横向き支軸が、前記長孔を挿通する状態で回動可能にかつ前後方向に移動可能に前記支持ブラケットに支持され、
前記横向き支軸の車体前方側に設けられ、手動操作可能な調節レバーと、
前記調節レバーと前記横向き支軸とを連結する帯板状の操作部材と、が備えられ、
前記調節レバーを操作することにより、前記横向き支軸を前後方向に位置変更させて、前記機械式連係ユニットにおける前記負荷検出部材の揺動変化に対する作動感度を変更調節可能に構成され、
前記操作部材は、前記操作部材における前記横向き支軸が連結される後部側箇所が車体横幅方向外方側に位置し、前記操作部材における前記調節レバーが連結される前部側箇所が車体横幅方向内方側に位置するように、折り曲げ形成されている請求項20に記載のトラクタ。 - 前記巻きバネが、前記操作部材における前記後部側箇所の車体横幅方向内方側に位置する状態で設けられ、
前記調節レバーが、前記操作部材における前記前部側箇所の車体横幅方向外方側に位置する状態で設けられている請求項21に記載のトラクタ。 - 前記操作部材及び前記支持ブラケットの摺動箇所に高耐摩耗性の座金が備えられている請求項21または22に記載のトラクタ。
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2022
- 2022-03-24 KR KR1020247006365A patent/KR20240039165A/ko unknown
- 2022-03-24 WO PCT/JP2022/014055 patent/WO2023007842A1/ja active Application Filing
- 2022-03-24 EP EP22848926.6A patent/EP4378289A1/en active Pending
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Patent Citations (7)
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JPS61100107A (ja) * | 1984-10-22 | 1986-05-19 | 株式会社クボタ | 農用トラクタの耕深制御装置 |
JPS62122509U (ja) * | 1986-01-24 | 1987-08-04 | ||
US20080110647A1 (en) * | 2006-10-26 | 2008-05-15 | Haibo Guo | Implement weight and center of gravity determination based on hitch cylinder pressure |
JP2018042530A (ja) | 2016-09-16 | 2018-03-22 | 株式会社クボタ | トラクタ |
JP2020156392A (ja) * | 2019-03-26 | 2020-10-01 | ヤンマーパワーテクノロジー株式会社 | 作業車両 |
WO2020241811A1 (ja) * | 2019-05-29 | 2020-12-03 | 株式会社クボタ | トラクタ |
JP2020191843A (ja) | 2019-05-29 | 2020-12-03 | 株式会社クボタ | トラクタ |
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KR20240039165A (ko) | 2024-03-26 |
EP4378289A1 (en) | 2024-06-05 |
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