JP3896748B2 - Front rotary tiller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front rotary tiller.
The present invention relates to stabilization of the steering performance during tillage work in the field of the front rotary tiller and compactization when the steering handle is folded after the completion of work, and improves excavation performance, maneuverability and storage performance. Try to figure.
[0002]
[Prior Art and Problems to be Solved by the Invention]
A conventional front rotary tiller is known as disclosed in JP-A-10-226370.
In such a known object, since the rotary tiller and the driving wheel are close to each other without any gap, the front tiller moves up and down by the driving reaction force of the wheel during traveling excavation work, and the excavation resistance at the start of tilling When there was a large change, or where the soil hardness in the field was soft and soft, the depth of tillage was not stable, and it was easy to cause a problem that the surface of the tiller waved.
[0003]
[Means for Solving the Problems]
The present invention is intended to eliminate the above-mentioned drawbacks of the conventional apparatus, and has taken the following technical means. That is, projecting tilling shaft (2) in the axial lateral direction near the front end portion of the long transmission case (1) in the longitudinal direction, the mounting seat for mounting the engine (3) to the intermediate part upper (10) is provided, A wheel shaft ( 4 ) is provided in the vicinity of the rear end so as to protrude in the lateral direction of the axial center, and a front reinforcing plate (9) is provided at the front of the rotary main cover (8) that covers the top of the tilling shaft (2). the provided a tread adjustably right and left drive wheels (18) provided on the wheel shaft (4), the wheel shaft (4) above and in the vicinity of the transmission case (1) from the rear, the handle frame upward (5) projecting the front end portion and attached to constitute a handle (6) to the end of the handle frame (5), the handle (6) the handle frame (5) tip the axis (12) about In turning, the end of the handle (6) contacts the drive wheel (18). The shift lever (11) is provided below the handle (6), and the shift lever (11) is detachable from the connecting portion (13) provided at the intermediate portion. When the transmission case (1) is drawn by pressing a sheet metal plate, the substantially flat mounting seat (10) located above the intermediate portion in the front-rear direction of the transmission case (1) is also integrally configured. The main shaft (20) protrudes from the left side of the engine (3), and the input shaft (23) protrudes from the side of the transmission case (1) below the main shaft (20). 20) is configured to transmit power from the input shaft (23), and the input shaft (23), the tilling shaft (2), and the wheel shaft (4) are arranged in a substantially horizontal direction in the front-rear direction in the transmission case (1). In addition, it is configured to be disposed, and is further mounted on the mounting seat (10). The screw rod (31) is fitted to the engine base (30) of the engine (3), and the screw rod (31) is rotatable by the support (32) on the base end side of the handle frame (5). It is configured to be supported so that it cannot move in the telescopic direction, and when the operation lever (33) of the screw rod (31) is rotated, the engine base (30) moves in the front-rear direction with respect to the handle frame (5). It was set as the structure of the characteristic front rotary tillage apparatus.
[0004]
[0005]
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described.
This embodiment relates to a front rotary tilling device 7, and a transmission case 1 that is long in the front-rear direction is disposed at the center in the left-right direction in a plan view in a substantially horizontal direction in a side view. Then, the tilling shafts 2 and 2 protrude from the front end of the transmission case 1 on both the left and right sides, respectively, and the tilling claws 15 are attached to the nail holders 14 that are integrally attached to the outer periphery of the tilling shaft 2. Is configured.
[0007]
The transmission case 1 is divided into left and right cases. Although not shown, a transmission gear for driving speed change, a sprocket for tillage transmission, a chain, etc. are installed inside, and then the left and right cases are tightened with bolts, nuts, etc. The left and right are integrated by tightening with an attachment 17. The transmission case 1 shown in FIG. 1 is a sheet metal flat plate that is drawn into a hollow shape with a press. The transmission case 1 includes a substantially flat mounting seat 10 above a middle portion in the front-rear direction, and the engine 3 is mounted on the mounting seat 10. ing.
[0008]
Wheel shafts 4, 4 project from the rear end of the transmission case 1 in the left-right lateral direction, and left and right drive wheels 18 are attached to the wheel shaft 4 so that tread adjustment is possible. One handle frame 5 projects from the rear of the transmission case 1 near the wheel shaft 4 toward the rear and obliquely upward, and the front end of the handle 6 is rotated around the axis 12 at the upper end of the handle frame 5. It is adjustable. The shape of the handle 6 is such that the end side is substantially horizontal from the rear oblique state in the extending direction of the handle frame 5 in a side view.
[0009]
The rotation of the handle 6 can be corrected to a small angle of the steering posture around the axis 12 or to a handle folded state in which the end of the handle 6 is brought close to contact with the driving wheel 18, and by adjusting the screw of the grip 19. Rotation is adjusted and fixed.
[0010]
A main shaft 20 protrudes on the left side of the engine 3, and a drive pulley 21 is attached to the main shaft 2. Further, an input shaft 23 to which a driven pulley 22 is attached projects from the side of the transmission case 1 below the main shaft 20. A V-belt 24 and a tension clutch 25 are disposed between the driving pulley 21 and the driven pulley 22. When the clutch lever 26 for the main clutch attached to the handle 6 shown in FIG. 1 is operated in the direction of the arrow “I” and the pulley as the tension clutch 25 is moved in the tension direction of the V belt 24 via the wire 27. The driving force of the engine 3 is transmitted into the transmission case 1 via the input shaft 23. The outer periphery of the pulley, which is the drive pulley 21, the driven pulley 22, and the tension clutch 25, is covered with a belt cover 39 for safety, so that fingers and the like of the hand do not contact the V belt 24.
[0011]
With these configurations, the input shaft 23 to which power is transmitted from the engine 3, the tilling shaft 2 to which power is transmitted from the input shaft 23, and the wheel shaft 4 to which power is transmitted from the input shaft 23 are transmitted to the transmission case 1. It is arranged in a substantially horizontal direction in the front-rear direction, and a flat mounting seat 10 is provided on the upper surface of the transmission case 1 in the substantially horizontal direction, so that the center of gravity of the machine body can be lowered and the operation can be stabilized.
[0012]
In the conventional apparatus, since the transmission case is arranged so as to be bent in a heft shape in a side view, the mounting position of the engine is increased, the center of gravity of the body is raised, and traveling is not stable.
A cultivating portion 16 is formed by projecting cultivating shafts 2 and 2 from the front end portion of the transmission case 1 to the left and right sides, respectively, and attaching a cultivating claw 15 to a claw holder 14 integrally attached to the outer periphery of the cultivating shaft 2 The upper part is covered with a rotary main cover 8 which is an arc-shaped cover. The rotary main cover 8 has the left and right intermediate portions of the cover attached to the wall surface of the transmission case 1 so as to cover about half of the tilling portion 16. Then, a front reinforcing plate 9 made of heavy iron material such as a thick steel plate is integrated inside by welding or bolts over substantially the entire width within an angle range of about 45 degrees from the inner peripheral front edge of the rotary main cover 8. It is attached. The left and right ends of the main cover 8 are covered with side covers 40, 40 at the upper side portions.
[0013]
As a result, the front edge of the rotary main cover 8 is reinforced, the main cover can be prevented from being damaged at the time of contact with other objects during traveling, and the load on the front of the fuselage can be increased. The vertical tillage of the tilling device in the place where excavation resistance at the start of tillage changes greatly or when the soil hardness in the field changes hard and soft due to the driving reaction force of the wheels at the time The plowing work can be easily performed with a small plowing surface with less waviness and a stable plowing depth.
[0014]
Reference numeral 28 denotes a gauge ring, which is supported by the tilling claw 15 that digs in by its own weight so as not to sink in soft soil. The amount of settlement is adjusted by adjusting the height of the support rod 29 in the vertical direction with respect to the cover. By adjusting or lowering the gauge wheel 28 below the tillage claw 15, the vehicle can be driven on the road.
[0015]
As described above, the handle frame 5 extends rearward and obliquely upward at the rear upper portion of the transmission case 1, and the handle 6 is attached to the front end of the handle frame 5 so as to be folded and housed. A shift lever 11 is provided on the right side of the handle frame 5 so as to project toward the operator behind the handle 6. The speed change lever 11 is provided with a cylindrical connecting portion 13 at an intermediate portion in the front-rear direction. When the connecting portion 13 is removed, the rear half of the speed change lever 11 can be removed.
[0016]
With this configuration, when the handle 6 is folded so as to approach the drive wheel 18 side, the shift lever 11 does not protrude greatly behind the handle 6 that hangs in a substantially upright direction, and the front-rear length can be shortened. It becomes easy to store the entire rotary tiller 7 in the trunk of an automobile.
[0017]
The engine 3 shown in FIG. 1 is attached to a substantially horizontal mounting seat 10 on the upper surface of the transmission case 1, and the front / rear balance of the entire machine body can be adjusted by adjusting the mounting position back and forth. With the configuration shown, it can be adjusted more easily.
[0018]
The front rotary tiller 7 shown in FIG. 3 is different from that shown in FIG. 1 in that the tip of the screw rod 31 is fitted to the engine base 30 of the engine 3 mounted on the mounting seat 10 on the upper surface of the transmission case 1. When the operation lever 33 of the screw rod 31 supported by the support 32 is rotated so that the base end side of the handle frame 5 is rotatable and cannot be moved in the expansion and contraction direction, the engine base 30 can be easily moved in the front-rear direction with respect to the handle frame 5. You can adjust the movement.
[0019]
At this time, the bolts 34, 34. . After the movement is adjusted, the movement adjustment is performed, and after the movement adjustment, the bolt 34 is securely fastened to the mounting seat 10. In the illustrated example, the mounting seat 10 has the long holes 35, 35. . Is open. As another form, a plurality of round holes may be opened in the sliding direction in the mounting seat 10, and the bolts 34 may be tightened by a stepped turn at the round hole position.
[0020]
[Action and effect of the invention]
Since the invention of claim 1 is configured as described above , the length between the tillage shaft 2 and the wheel shaft 4 in the transmission case 1 can be increased in the front-rear direction, and the engine 1 can be disposed low on the transmission case 1 below the fuselage. The center of gravity of the airframe is lowered, and stabilization of tillage work can be achieved.
In particular, since the input shaft 23, the tilling shaft 2 and the wheel shaft 4 are arranged in the transmission case 1 in a substantially horizontal direction in the front-rear direction, stable running with a low center of gravity is possible.
[0021]
Further, the front portion of the rotary main cover 8 is semi-cover which covers the upper side of the cultivating shaft 2, since attaching the front portion reinforcing plate 9 performs a reinforcement of the front edge of the rotary main cover 8 in front reinforcing plate 9 In addition to preventing major damage to the main cover at the time of contact with other objects during traveling, the load on the front of the aircraft can be increased, and the top tillage device due to the driving reaction force of the wheels during traveling excavation work The vertical movement of the cultivating section can be reduced when the excavation resistance at the start of tillage or when the excavation resistance changes greatly, or when the soil hardness in the field fluctuates softly and softly. This makes it possible to easily perform tillage work.
[0022]
Further, a screw rod 31 is fitted to the engine base 30 of the engine 3 mounted on the mounting seat 10, and the screw rod 31 can be rotated by a support tool 32 on the proximal end side of the handle frame 5 and cannot be moved in the telescopic direction. Since the engine base 30 is configured to move in the front-rear direction with respect to the handle frame 5 when the operation lever 33 of the screw rod 31 is supported and adjusted, the engine base 30 can be easily moved in the front-rear direction with respect to the handle frame 5. I can do it now. And the front-back balance of the whole body can be adjusted easily.
[0023]
Further, when the handle 6 is rotated about the axis 12 at the front end portion of the handle frame 5, the end portion of the handle 6 is rotated until it comes into contact with the drive wheel 18 to be in a folded state. Since the lower shift lever 11 is configured to be detachable from the connecting portion 13 provided at the intermediate portion thereof , the shift lever 11 does not protrude greatly behind the handle 6 that hangs in a substantially upright direction, and the longitudinal length Therefore, it becomes easy to store the entire front rotary tiller 7 in the trunk of an automobile.
[Brief description of the drawings]
FIG. 1 is an overall side view showing a working state.
FIG. 2 is a side view showing the handle being stowed.
FIG. 3 is an overall side view in which another configuration is folded.
4 is an overall perspective view of FIG. 3. FIG.
FIG. 5 is a perspective view of the main part of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission case 2 Tilling shaft 3 Engine 4 Wheel shaft 5 Handle frame 6 Handle 7 Front rotary tilling device 8 Rotary main cover 9 Front reinforcement board 10 Mounting seat 11 Shift lever 12 Shaft center 13 Connection part
18 drive wheels
20 spindles
23 input shafts
30 engine base
31 threaded rod
32 supports
33 control lever

Claims (1)

Near the front end portion to the cultivating shaft in the longitudinal direction in a long transmission case (1) and (2) projecting in the axial horizontal direction, the mounting seat for mounting the engine (3) to the intermediate part upper (10) is provided, the rear end The wheel shaft ( 4 ) is provided in the vicinity of the portion so as to project in the lateral direction of the shaft center, and a front reinforcing plate (9) is provided at the front of the rotary main cover (8) that covers the top of the tilling shaft (2). The wheel shaft (4) is provided with left and right drive wheels (18) so that the tread can be adjusted , and the handle frame ( 5 ) protrudes upward from the rear part of the transmission case ( 1 ) near the wheel shaft ( 4 ). and setting, and attached constitute a front end of the handle (6) to the end of the handle frame (5), rotates the handle (6) the handle frame (5) tip the axis (12) about Rotate the end of the handle (6) until it touches the drive wheel (18). The shift lever (11) is provided below the handle (6), and the shift lever (11) is configured to be detachable from a connecting portion (13) provided at an intermediate portion. When the transmission case (1) is drawn by pressing a sheet metal flat plate, the substantially flat mounting seat (10) located above the intermediate portion in the front-rear direction of the transmission case (1) is also integrally configured, A main shaft (20) protrudes from the left side of the engine (3), an input shaft (23) protrudes from the side of the transmission case (1) below the main shaft (20), and extends from the main shaft (20). A configuration for transmitting power to the input shaft (23), and the input shaft (23), the tilling shaft (2), and the wheel shaft (4) are disposed in a substantially horizontal direction in the front-rear direction in the transmission case (1). And an engine mounted on the mounting seat (10). A screw rod (31) is fitted to the engine base (30) of (3), and the screw rod (31) is freely rotatable by a support tool (32) on the proximal end side of the handle frame (5). It is configured to be supported so that it cannot move in the direction, and when the operation lever (33) of the screw rod (31) is rotated, the engine base (30) moves in the front-rear direction with respect to the handle frame (5). front rotary tiller to.

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