JP6901759B2 - Agricultural work machine - Google Patents

Description

The present invention relates to an agricultural work machine used in connection with a traveling vehicle.

Conventionally, for example, the agricultural work machine described in Patent Document 1 below is known.

This conventional agricultural work machine includes a mounting portion mounted on a traveling vehicle such as a tractor, a cutting work portion connected to the mounting portion via an offset mechanism portion (parallel link) that can rotate in the horizontal direction, and a cutting work portion. It is provided with an electric cylinder arranged above the cutting work portion, and the cutting work portion rotates in the vertical direction by the expansion and contraction operation of the electric cylinder.

Japanese Unexamined Patent Publication No. 2011-103850

However, in the above-mentioned conventional agricultural work machine, since the offset mechanism portion (parallel link) is configured to rotate in the horizontal direction, there is a problem that the length in the front-rear direction is long and the weight balance is poor.

The present invention has been made in view of such a point, and an object of the present invention is to provide an agricultural work machine capable of improving the weight balance.

The agricultural work machine according to the present invention includes a machine body connected to a traveling vehicle, an offset frame provided on the machine body so as to be rotatable in the vertical direction about the first rotation center axis, and the first offset frame. It is provided so as to be rotatable in the vertical direction about a second rotation center axis different from the rotation center axis, and includes a working body that is in a retracted state and an offset state.

According to the present invention, the weight balance can be improved.

It is a perspective view of the agricultural work machine which concerns on one Embodiment of this invention. It is a side view of the same farm work machine. Same as above It is a rear view (offset state, horizontal posture) of the agricultural work machine. Same as above. It is a rear view (offset state, tilted posture) of the agricultural work machine. Same as above It is a rear view (stored state) of the agricultural work machine. It is a figure which shows the transmission means of the agricultural work machine as above. It is a figure which shows a part (chain etc.) of the transmission means as above. (A) is a rear view of the working body in the retracted state, and (b) is a rear view of the working body in the offset state.

An embodiment of the present invention will be described with reference to FIGS. 1 to 8.

Reference numeral 1 in the figure is an agricultural work machine, which is connected to, for example, the rear part of a tractor 2 which is a traveling vehicle, and the traveling of the tractor 2 moves the field or the like forward (in the direction of travel) while performing agricultural work, for example, mowing grass. It is a mower (offset work machine) that performs work.

The agricultural work machine 1 has a machine body 3 connected to a three-point link (not shown) at the rear of the tractor 2 and a vertical direction centered on the first rotation center axis (rotation fulcrum) L1 in the front-rear direction to the machine body 3. One offset frame 4 that is rotatably provided in the upper and lower sides of the offset frame 4 and the second rotation center axis (rotation fulcrum) L2 in the front-rear direction that is different from the first rotation center axis L1. It includes a mowing work body (offset work unit) 5, which is a work body rotatably provided in a direction.

Further, the agricultural work machine 1 is erected between the machine body 3 and the offset frame 4, and the offset frame 4 is rotated about the first rotation center axis L1 with respect to the machine body 3 and positioned at a desired position. The rotation driving means 6 is erected between the offset frame 4 and the mowing work body 5, and the mowing work body 5 is rotated with respect to the offset frame 4 about the second rotation center axis L2 and at a desired position. It is provided with a second rotation driving means 7 for positioning. The first rotation driving means 6 and the second rotation driving means 7 are positioned so as to overlap each other in the rear view.

Further, the agricultural work machine 1 is provided with a transmission means 8 that inputs power from the tractor 2 and transmits the input power to the mowing work body 5, and the rotary work means 10 of the mowing work body 5 transmits the power. Power is received from the means 8 to rotate and mow the grass.

Then, based on the vertical rotation of the offset frame 4 with respect to the machine body 3 and the vertical rotation of the mowing work body 5 with respect to the offset frame 4, the mowing work body 5 is in the retracted state and the offset state, and is in the horizontal posture and the inclined posture (left). (Including both low right high tilt posture and left high right low tilt posture).

That is, the mowing work body 5 is in a non-offset stored state located at a position behind the tractor 2 (a state in which the entire mowing work body (including substantially the entire body) is stored in the rear region of the tractor) and the tractor 2 It is in an offset state (a state in which the entire mowing work body (including substantially the entire body) protrudes sideways with respect to the tractor) at an offset position which is a position shifted laterally from the rear position of the tractor. In other words, the left and right positions of the mowing work body 5 with respect to the machine body 3 can be adjusted.

Therefore, by setting the mowing work body 5 in the offset state, it is possible to perform mowing work on an inclined surface (work target surface) inclined with respect to the traveling surface of the tractor 2, as described below.

Further, the mowing work body 5 has a horizontal posture along the horizontal direction (horizontal direction) in which the rotation center axis L3 of the rotation work means 10 which is a work unit is orthogonal to the traveling direction (front-back direction), and the rotation center axis L3. Is an inclined posture that is inclined with respect to the horizontal direction. In other words, the inclination angle of the mowing work body 5 with respect to the horizontal direction can be adjusted.

Therefore, by setting the mowing work body 5 in an inclined posture according to the inclined surface (work target surface) inclined with respect to the traveling surface of the tractor 2, the mowing work on the inclined surface is also possible. That is, the mowing work body 5 can perform mowing work in either a horizontal posture or an inclined posture.

The inclination angle (angle with respect to the horizontal direction) θ of the mowing work body 5 can be adjusted to an arbitrary value within a predetermined range (for example, −45 ° ≦ θ ≦ 70 °) (FIG. 8B). See). However, although not shown, for example, a configuration in which the tilt angle θ can be adjusted to 70 ° or more, or a configuration in which the tilt angle θ can be adjusted to −45 ° or less is also possible.

The airframe 3 has a front frame 11 connected to a three-point link at the rear of the tractor 2, and a rear frame 12 rotatably attached to the front frame about an axis 13 in the left-right direction. ..

The front frame 11 has a three-point connecting portion 16 including a top pin 14 and a lower pin 15, and the three-point connecting portion 16 is connected to a three-point link of the tractor 2. The rear frame 12 has a rotation support portion 17, and the base end side, which is one end side of the offset frame 4, is rotatably supported by the rotation support portion 17, and the tip end side, which is the other end side of the offset frame 4. The side rotatably supports the mowing work body 5.

The offset frame (vertical rotation frame) 4 is composed of, for example, one dogleg-shaped hollow member, and also serves as a transmission case for accommodating at least a part of the transmission means 8. The offset frame 4 has a front-protruding airframe mounting portion 21 at the base end portion, and the airframe mounting portion 21 is the first rotation center on the inner peripheral side of the rotation support portion 17 of the rear frame 12 of the airframe 3. It is rotatably attached around the axis L1.

The offset frame 4 has a front-protruding front rotation support portion 22 and a rear-protruding rear-rotation support portion 23 at the tip portion, and the mowing work body 5 is subjected to the first operation by these both rotation support portions 22 and 23. It is rotatably supported around the second rotation center axis L2 parallel to the motion center axis L1.

The mowing work body 5 is a work machine 31 rotatably attached to the tip end side of the offset frame 4 in the vertical direction about the second rotation center axis L2, and the work machine 31 is rotatably provided for work. A gauge roller 32, which is a grounding ring that touches the target surface (ground), and a work machine 31 are rotatably provided, and the mowing work (agricultural work) is performed while rotating around the rotation center axis L3 by the power from the transmission means 8. It has a rotating work means 10 to perform.

The work machine 31 has a cover plate 34 that covers the rotating work means 10, and left and right side plates 35 and 36 that are fixed to the side ends of the cover plate 34. A gear case 37 and a mounting frame 38 are fixedly fixed to the central portion of the left side plate 35, and the frame mounting portion 40 is formed by these two members, the gear case 37 and the mounting frame 38.

That is, the work machine 31 has a laterally projecting frame mounting portion 40 at the left side end portion, and the frame mounting portion 40 is second to the rotation support portions 22 and 23 at the tip end portion of the offset frame 4. It is rotatably attached around the rotation center axis L2.

The rotation working means 10 has a rotation axis 41 located on the rotation center axis L3 orthogonal to the second rotation center axis L2, and the axis of the rotation axis 41 and the rotation center axis L3 coincide with each other. A cutting claw (frail claw) 43 is detachably attached to each claw attachment portion 42 of the rotating shaft 41 via the attachment means 44. The mounting means 44 is composed of, for example, bolts 45, nuts 46, shackles 47, and the like.

The first rotation driving means 6 is composed of only the first cylinder 51, which is one driving member that expands and contracts. The first cylinder 51 is composed of, for example, an electro-hydraulic cylinder, and has a cylinder main body 52 and a rod portion 53 that goes in and out of the cylinder main body 52.

The base end portion of the cylinder body portion 52 is rotatably attached to the cylinder mounting portion 55 of the rear frame 12 of the machine body 3 about a shaft 56 in the front-rear direction. The tip of the rod portion 53 is rotatably attached to the cylinder attachment portion 57 of the offset frame 4 about a shaft 58 in the front-rear direction.

Then, the offset frame 4 rotates in the vertical direction with respect to the machine body 3 about the first rotation center axis L1 by the expansion / contraction operation of the first cylinder 51.

The second rotation driving means 7 is centered on a second cylinder 61, which is one driving member that expands and contracts, and an axis 63 in the front-rear direction with respect to the offset frame 4 according to the expansion and contraction operation of the second cylinder 61. It is composed of a rotating member (tilt posture support member) 62 having a substantially triangular plate shape that rotates. The second cylinder 61 and the rotating member 62, which are rotatably connected to each other, are arranged behind the doglegged offset frame 4.

Like the first cylinder 51, the second cylinder 61 is made of, for example, an electro-hydraulic cylinder, and has a cylinder main body 66 and a rod portion 67 that goes in and out of the cylinder main body 66.

The base end portion of the cylinder body portion 66 is rotatably attached to the cylinder mounting portion 68 of the offset frame 4 about a shaft 69 in the front-rear direction. The tip of the rod portion 67 is rotatably connected to one end of the rotating member 62, which is an interlocking member, about a shaft 70 in the front-rear direction.

The central portion of the rotating member 62 in the longitudinal direction is rotatably attached to the rotating member mounting portion 71 of the offset frame 4 about a shaft 63 in the front-rear direction. A long hole-shaped engaging hole 72 is formed at the other end of the rotating member 62, and the mounting frame 38 of the working machine 31 of the mowing work body 5 is engaged in the engaging hole 72. The shaft portion 73 is slidably inserted along the engaging hole portion 72. Therefore, the mowing work body 5 is held in a desired posture by engaging the engaging hole portion 72 and the engaging shaft portion 73. A disk-shaped retaining member 74 is attached to the tip end side of the engaging shaft portion 73 of the mounting frame 38.

Then, the rotating member 62 rotates in conjunction with the expansion and contraction operation of the second cylinder 61, and the rotation of the rotating member 62 causes the mowing work body 5 to move to the second rotation center with respect to the offset frame 4. It rotates in the vertical direction around the axis L2.

Here, as is clear from FIG. 8, the cylinders 51 and 61, which are the two actuators, are located behind the tractor 2 in both the retracted state and the offset state of the mowing work body 5. That is, the two relatively heavy cylinders 51 and 61 are always located behind (directly behind) the tractor 2 regardless of the state and posture of the mowing work body 5, and do not move to the offset position with respect to the tractor 2. In other words, both cylinders 51 and 61 are always located behind the tractor 2 and within the width of the tractor 2 regardless of the state and posture of the mowing work body 5. As shown in FIG. 8, the configuration is not limited to the configuration in which the entire cylinders 51 and 61 are located within the width of the tractor 2. For example, although not shown, a part of the cylinders 51 and 61 protrudes outside the width of the tractor 2. It may be configured.

In particular, as shown in FIG. 8A, when the mowing work body 5 is in the retracted state, at least the cylinder main body 66 of the second cylinder 61 is located behind the tractor 2 and above the mowing work body 5. Further, as shown in FIG. 8B, when the mowing work body 5 is in the offset state, at least the rod portion 67 of the second cylinder 61 is located behind the tractor 2 and on the left side of the mowing work body 5. Then, as is clear from FIG. 8, the second cylinder 61 is integrated with the offset frame 4 located in the rear region of the tractor 2 so as to overlap the second cylinder 61 in the rear view, and is in the front-rear direction. It rotates around the first rotation center axis L1.

As shown in FIGS. 2, 6 and the like, the transmission means 8 includes an input shaft 80 for inputting power from the PTO axis of the tractor 2 and rotation on the first rotation center axis L1 (rotation of the offset frame 4 with respect to the body 3). It has a first transmission shaft 81, which is a transmission shaft in the front-rear direction located on the fulcrum), and a bendable joint 82 that connects the input shaft 80 and the first transmission shaft 81.

The input shaft 80 is rotatably supported by a bearing portion 83 of the front frame 11 of the machine body 3. The first transmission shaft 81 is arranged in the airframe mounting portion 21 of the offset frame 4, and is rotatably supported by a plurality of bearings 84. The axis of the first transmission shaft 81 and the first rotation center axis are It matches with L1. When the mowing work body 5 is in the retracted state, the first transmission shaft 81 is located above the mowing work body 5 in the retracted state.

The joint 82 is composed of, for example, a double joint having two cross axes 82a, and the entire joint 82 is covered by a downward U-shaped joint cover 86 attached to the rear frame 12. The input shaft 80 is connected to the PTO shaft of the tractor 2 via a joint (not shown).

Further, the transmission means 8 includes a second transmission shaft 87, which is a transmission shaft in the front-rear direction located on the second rotation center axis L2 (on the rotation fulcrum of the mowing work body 5 with respect to the offset frame 4), and the second transmission shaft 87. A transmission shaft side gear (bevel gear) 88 fixed to the front end of the transmission shaft 87 and a rotation shaft side gear fixed to the left end of the rotation shaft 41 of the mowing work body 5 and engaged with the transmission shaft side gear 88. It has (bevel gear) 89. The second transmission shaft 87, the transmission shaft side gear 88, and the rotary shaft side gear 89 are arranged in the gear case 37 of the frame mounting portion 40 of the mowing work body 5.

The second transmission shaft 87 is rotatably supported by a plurality of bearings 85, and the axis of the second transmission shaft 87 and the second rotation center axis L2 coincide with each other. The rotary shaft 41 of the mowing work body 5 has an insertion portion 41a at its left end inserted into the gear case 37 and is rotatably supported by a plurality of bearings 90. It matches with L3. The second transmission shaft 87 and the rotation shaft 41 are located on the same plane with their shaft cores orthogonal to each other.

Further, the transmission means 8 has a first sprocket 91 fixed to the first transmission shaft 81 in the base end portion of the offset frame 4 and a second transmission shaft 87 fixed to the second transmission shaft 87 in the tip end portion of the offset frame 4. It has a sprocket 92 and a chain 93 which is an endless transmission member hung on both sprockets 91 and 92.

Further, as shown in FIG. 7, the chain 93 is also hung on the guide sprocket 94 and the tension sprocket 95, and is urged by a leaf spring 96 which is an urging means for applying a desired tension to the chain 93. Has been done.

The offset frame 4 also has a function of a transmission case for accommodating the transmission means 8, and the transmission shafts 81, 87, sprockets 91, 92, 94, 95 and leaf spring 96 are housed in the offset frame 4. ing. The front end side of the first transmission shaft 81 protrudes from the inside of the offset frame 4, and the joint 82 is connected to this protruding portion. Similarly, the front end side of the second transmission shaft 87 also protrudes from the inside of the offset frame 4, and the transmission shaft side gear 88 is fixed to this protruding portion.

Next, the operation and the like of the agricultural work machine 1 will be described.

First, as shown in FIG. 8B, the operator adjusts the left and right positions of the mowing work body 5 of the agricultural work machine 1 connected to the three-point link (agricultural work machine elevating support device) of the tractor (for example, a small tractor) 2. The desired offset state (the state in which the mowing work body 5 is located outside the tire 2a of the tractor 2) is set.

Further, the worker sets the posture of the mowing work body 5 in the offset state to a desired posture according to the work target surface on which grass grows. That is, for example, by operating the second cylinder 61 of the second rotation driving means 7, the mowing work body 5 is rotated about the second rotation center axis L2, so that the inclination angle θ of the mowing work body 5 in the offset state is θ. To adjust.

After such adjustment, when the agricultural work machine 1 is moved forward by the traveling of the tractor 2, the rotating work means 10 of the mowing work body 5 performs the mowing work while rotating in a predetermined direction by the power from the transmission means 8.

When the mowing work is completed and the agricultural work machine 1 is transported to a desired position by the tractor 2, the offset frame 4 is moved to the first rotation center axis L1 by the operation of the first cylinder 51 of the first rotation drive means 6. The mowing work body 5 is also rotated around the second rotation center axis L2 by the operation of the second cylinder 61 of the second rotation driving means 7. Return to the stored state of.

Even when the mowing work body 5 in the horizontal posture is set to the retracted state as shown in FIG. 8A, it is possible to perform the mowing work with the mowing work body 5 in the retracted state.

According to the agricultural work machine 1, the second rotation driving means 7 has a second cylinder 61 located behind the tractor 2 in both the retracted state and the offset state of the mowing work body 5. Since the second cylinder 61 and the rotating member 62 remain at the rear positions of the tractor 2 even in the offset state of the mowing work body 5, the left and right weight balance is good, and thus the weight balance can be improved.

Further, the second cylinder 61 of the second rotation driving means 7 is located behind the tractor 2 and above the mowing work body 5 when the mowing work body 5 is in the retracted state, and is a tractor when the mowing work body 5 is in the offset state. Since it is located behind 2 and on the side of the mowing work body 5, it is possible to effectively improve the weight balance.

Further, the offset frame 4 is provided on the machine body 3 so as to be rotatable in the vertical direction about the first rotation center axis L1, and the mowing work body 5 is provided on the offset frame 4 about the second rotation center axis L2. Since the structure is provided so as to be rotatable in the vertical direction, the length in the front-rear direction is short and the weight balance in the front-rear direction is good, so that the weight balance can be improved more effectively.

Further, the transmission means 8 for transmitting power from the tractor 2 side includes a first transmission shaft 81 located on the first rotation center axis L1 and a second transmission shaft 87 located on the second rotation center axis L2. Therefore, the configuration can be simplified, the weight and size can be reduced, and even a small tractor can be used stably. In particular, the mowing work body 5 has a smaller number of parts than the conventional mowing work unit, has a simple structure, and is relatively lightweight.

The agricultural work machine 1 is not limited to the mower, and may be, for example, a ridge coating machine, a grooving machine, a cultivator, a harvester, or the like.

Further, the agricultural work machine 1 is not limited to a configuration in which the working unit is in a right offset state in which the working unit protrudes to the right side with respect to the traveling vehicle. Or the like.

Further, the drive member (drive source) of the rotary drive means is not limited to the electro-hydraulic cylinder, and may be, for example, a hydraulic cylinder, an electric cylinder, a hydraulic motor, an electric motor, or the like, and the rotary drive means is a drive member. It may be composed of only one, or may be one in which an interlocking member is connected to the driving member.

Further, the transmission member housed in the offset frame 4 also serving as the transmission case is not limited to the endless member such as a chain or a belt, and may be a transmission shaft or the like.

1 Agricultural work machine 2 Tractor that is a traveling vehicle 3 Machine 4 Offset frame 5 Mowing work body that is a work body 6 First rotation drive means 7 Second rotation drive means 8 Transmission means
87 Second transmission axis, which is the transmission axis
93 Chain that is a transmission member L1 1st rotation center axis L2 2nd rotation center axis

Claims (5)

It is an agricultural work machine connected to the rear of a tractor, which is a traveling vehicle.
The aircraft connected to the rear of the tractor and
An offset frame that is rotatably provided in the vertical direction around the first rotation center axis on this machine,
A working body that is rotatably provided in the offset frame in the vertical direction around a second rotation center axis different from the first rotation center axis, and is in a retracted state and an offset state .
Equipped with a transmission means to transmit power toward this work body,
The offset frame also serves as a transmission case for accommodating at least a part of the transmission means inside, and is a farm work machine characterized in that it is formed in a dogleg shape. Den kinematic means, agricultural machine according to claim 1, wherein further comprising a transmission shaft located in the second pivot center axis. The transmission means has an endless transmission member, and has an endless transmission member.
The agricultural work machine according to claim 2 or 3, wherein the transmission member is housed in an offset frame that also serves as a transmission case. The first rotation driving means for rotating the offset frame with respect to the machine body,
A second rotation driving means for rotating the working body with respect to the offset frame is provided.
The agricultural work machine according to any one of claims 1 to 3 , wherein the offset frame, the first rotation driving means, and the second rotation driving means are located so as to overlap each other in a rear view. The agricultural work machine according to any one of claims 1 to 4 , wherein the work body is a mowing work body capable of working in either a horizontal posture or an inclined posture.

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