JP4176265B2 - Power tiller operation control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation device for a power tiller that controls traveling, reverse traveling, tilling work, and the like of the power tiller.
[0002]
[Prior art]
In general, a power tiller is provided with a reverse switching device and a rotary clutch that enables rotation of a rotary work machine before and after enabling forward and reverse rotation of the wheel. The reverse switching device and the rotary clutch are operated by individual operation levers.
[0003]
[Problems to be solved by the invention]
As described above, operating the forward / reverse switching device and the rotary clutch with individual operation levers complicates the driving operation and increases the fatigue of the operator.
[0004]
The inventors of the present invention have been made in view of such circumstances, so that a single operation lever can be used to control line, reverse, and tillage operations, thereby simplifying the operation and reducing the operator's fatigue. It aims at providing the power cultivator which can contribute to reduction.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention attaches a single control lever to the aircraft so that it can move along a select path along the left-right direction of the aircraft and a shift path along the front-rear direction of the aircraft. The travel position and tilling work position are arranged side by side on the route, and the neutral position is provided at the intermediate point on the shift route. When the operation lever is shifted forward from the neutral position at the travel position, the wheels are driven forward, and the operation lever is plowed. When driving forward at the position, the wheel and the rotary working machine are driven, and when the operation lever is shifted backward at the reverse position, the wheel is driven backward . A wheel free release position is provided alongside the travel position and tillage work position, and the control lever is shifted forward or backward at the wheel free release position. Then the feature that the power transmission to the wheel is to be cut off.
[0006]
According to the above feature of the present invention, it is possible to easily control the traveling, reverse traveling and tilling work with a single operating lever, which is effective for reducing the fatigue of the worker, and at the time of traveling and tilling work, The operation lever is shifted forward from the neutral position, and when moving backward, it is shifted backward, which is the opposite of them. is there. Also, especially in the select route, a wheel free release position is provided alongside the travel position and tillage work position, and power transmission to the wheel is cut off when the operation lever is shifted forward or backward at the wheel free release position. The same operation lever can be used to control not only traveling, reverse traveling and tilling work but also free wheel release, which can contribute to improvement in operability.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0010]
1 is a side view of a power cultivator equipped with a driving operation device of the present invention, FIG. 2 is a side view of the driving operation device, FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 3 is an enlarged view of the main part, FIG. 5 is an explanatory diagram of the action at the time of reverse traveling, FIG. 6 is an explanatory diagram of an action at the time of tillage work, FIG. 7 is an explanatory diagram of an action at the time of free wheel release, and FIG. FIG. 9 is a sectional view taken along line 9-9 of FIG. 3, and FIG. 10 is a sectional view taken along arrow 10 in FIG.
[0011]
First, as shown in FIG. 1, a body 1 of a power tiller T is connected to a reduction case 2 extending in the vertical direction, a frame 3 projecting from the front surface of the case 2, and an upper portion of the reduction case 2. A transmission case 4, a rotary case 5 detachably connected to the rear part of the transmission case 4, and a loop type steering handle 6 attached to the upper part of the transmission case 4 and extending backward. .
[0012]
An engine 7 is mounted on the frame 3, a hydrostatic continuously variable transmission 8 is housed in the transmission case 4, and a crankshaft 9 of the engine 7 and an input shaft 10 of the continuously variable transmission 8 are belt-type 1s. The next drive device 11 is connected. The reduction case 2 supports the axle 12 at the other end and houses a wheel drive device 15 that connects the axle 12 and the output shaft 14 of the continuously variable transmission 8. Wheels 13 are taken on the axle 12.
[0013]
The rotary case 5 supports the rotary shaft 17 at the lower end portion and houses a rotary drive device 19 that connects the rotary shaft 17 and the output shaft 14 of the continuously variable transmission 8. A rotary working machine 18 is taken on the rotary shaft 17.
[0014]
The hydrostatic continuously variable transmission 8 is a known one in which a variable capacity swash plate type hydraulic pump and a fixed capacity swash plate type hydraulic motor are connected via a hydraulic closed circuit. However, the output shaft 14 is connected to the hydraulic motor. When the shift lever 16 (see FIG. 3) connected to the swash plate of the hydraulic pump is operated from the neutral position to the forward side f, the rotational speed of the output shaft 14 is increased from zero to the forward direction, and the shift lever 16 is moved to the neutral position. When operated from the position to the reverse side r, the rotational speed of the output shaft 14 is increased from zero in the reverse direction.
[0015]
The primary driving device 11 is provided with a tension type first clutch 21 that can turn on and off the transmission path of the driving force, and the wheel driving device 15 can turn on and off the transmission path of the driving force. A second clutch 22 is provided, and the rotary drive device 19 is provided with a third clutch 23 that can turn on and off the transmission path of the driving force.
[0016]
As shown in FIGS. 2 to 4, a driving operation device 24 of the present invention is attached to the steering handle 6. The driving operation device 24 has a casing 25 fixed to the operation handle 6, and a control shaft 27 is rotatably supported on the left and right side walls thereof. Both ends of the control shaft 27 projecting out of the casing 25 are supported at both ends of a deadman lever 28 that can be gripped together with the steering handle 6, and the deadman lever 28 has a link 29 and an operating wire 30. The first clutch 21 is connected through the. The first clutch 21 is turned off when the operating wire 30 is relaxed and turned on when the operating wire 30 is pulled.
[0017]
Further, in the casing 25, the control shaft 27 has a first operation lever 31 that is spline-fitted to the shaft 27 and a second operation lever that is rotatably fitted to the shaft 27 in order from the left side in FIGS. 3 and 4. 32, a third operating lever 33 coupled to the shaft 27 via a key 36, a bracket 37 rotatably coupled to the shaft 27, and a fourth operating lever 34 rotatably coupled to the shaft 27. And a fifth actuating lever 35 is provided. A first driving sector gear 40 is formed integrally with the second operating lever 32, and a second driving sector gear 41 having a larger diameter than the first driving sector gear 40 is formed integrally with the fourth operating lever 34.
[0018]
The second clutch 22 is connected to the first actuating lever 31 via an actuating wire 42, and the clutch 22 is turned on when the actuating wire 42 is relaxed and turned off when the actuating wire 42 is pulled.
[0019]
Further, support shafts 45 parallel to the control shaft 27 are attached to the left and right side walls of the casing 25, and the first and second driven sector gears meshing with the first and second drive sector gears 40 and 41 are attached to the shaft 45. A driven sector gear assembly 48 formed by integrally connecting 46 and 47 to each other is rotatably provided. The sector gear assembly 48 is integrally provided with an operating arm 49, to which the transmission lever 16 of the hydrostatic continuously variable transmission 8 is connected via a push-pull type operating wire 43. The actuator wire 43 is rotated to the forward side f by pulling the operating wire 43, and is rotated to the reverse side r by pressing the operating wire 43.
[0020]
The third clutch 23 is connected to the fifth actuating lever 35 via a link 50 and an actuating wire 44, and the clutch 23 is turned on when the actuating wire 44 is relaxed and turned off when towing.
[0021]
A pivot 51 arranged in a direction orthogonal to the control shaft 27 and a slide pin 52 slidable in parallel with the control shaft 27 are attached to the bracket 37, and the boss 26 a of the operation lever 26 is rotated by the pivot 51. Supported as possible.
[0022]
An operating arm 55 having a connection hole 56 is formed integrally with the boss 26 a of the operation lever 26, and a connection pin 57 slidably fitted in the connection hole 56 has a long hole 58 of the bracket 37. It penetrates and is fixed to the sliding pin 52. The long hole 58 is disposed in parallel with the sliding pin 52. Thus, the operation lever 26 can move on a selection path Se around the pivot 51 along the left-right direction of the body 1 and a shift path Sh around the control shaft 27 along the front-rear direction of the body 1 ( According to the movement of the operating lever 26 along the select path Se, the sliding pin 52 can be slid left and right in FIG. The selection path Se is provided with a tilling work position C, a traveling position D, a wheel free release position W, and a reverse position R in order from the left side in FIG. Further, according to the rotation of the operation lever 26 along the shift path Sh, the sliding pin 52 can be rotated around the control shaft 27 via the bracket 37, and the neutral position N is at the midpoint of the shift path Sh. Provided. Therefore, the operation lever 26 can move forward F and backward B from the neutral position N.
[0023]
As shown in FIGS. 4 and 8, the second operating lever 32, the fourth operating lever 34, and the fifth operating lever 35 are slidably fitted with a sliding pin 52. The same circular connection as the pin 52 is provided. Holes 60, 61, 62 are provided. Further, the second operating lever 32 is provided with a lost motion hole 63 into which the sliding pin 52 is always fitted, and this lost motion hole 63 has an arc shape concentric with the control shaft 27 as shown in FIG. Thus, the rotation of the sliding pin 52 around the control shaft 27 at a constant angle is not transmitted to the third operating lever 33.
[0024]
An operation panel 64 covering the upper surface of the casing 25 is attached. The operation panel 64 is provided with a restriction groove 65 with which the operation lever 26 is engaged, whereby the selection path Se of the operation lever 26 is limited to the neutral position N, and the tilling work position C, the traveling position D, and the wheel free release position. The shift path Sh at W is limited to the forward F side from the neutral position N, and the shift path Sh at the reverse position R is limited to the backward B side from the neutral position N.
[0025]
Next, the operation of this embodiment will be described.
[During travel] (See FIGS. 3, 4, 8 and 10)
As shown in FIGS. 3 and 4, first, the dead wire lever 28 is gripped together with the steering handle 6 with the operating lever 26 in the neutral position N, whereby the operating wire 30 is pulled and the first clutch 21 is pulled. Turn on the. Next, the operation lever 26 is rotated to the travel position D along the select path Se. Then, the sliding pin 52 controlled by the operating lever 26 is detached from the connecting hole 60 of the second operating lever 32 and is fitted into the connecting hole 61 of the fourth operating lever 34, so that the operating lever 26 is now moved forward. When shifting toward F, the fourth actuating lever 34 is rotated in the forward direction via the sliding pin 52, so that the second driven sector gear 47 is rotated forward by the second driving sector gear 41 integrated with the lever 34 ( When the operating arm 49 pulls the operating wire 43, the transmission lever 16 of the hydrostatic continuously variable transmission 8 is rotated to the forward side f, and the transmission ratio is set to the top side. Control steplessly.
[0026]
During this time, the sliding pin 52 moves freely in the arc-shaped lost motion hole 63 of the third operating lever 33, so that the third operating lever 33 remains inactive and the second clutch 22 remains on.
[0027]
Therefore, the power of the engine 7 is transmitted to the axle 12 and the wheel 13 through the primary drive device 11, the hydrostatic continuously variable transmission 8 and the wheel drive device 15 to rotate it forward. The machine T can run.
[0028]
In this case, the rotary case 5 is removed from the transmission case 4 when the rotary working machine 18 interferes with the traveling of the power tiller T.
[Backward travel] (Refer to FIG. 4, FIG. 5, FIG. 8 and FIG. 10)
In the ON state of the first clutch 21, the operation lever 26 is rotated to the reverse position R along the select path Se. Then, as shown in FIG. 5, the sliding pin 52 moves to the left and engages with the connection hole 60 (see FIG. 4) of the second operation lever 32, while from the connection hole 61 of the fourth operation lever 34. break away. Therefore, when the operation lever 26 is shifted toward the rear B, the second operating lever 32 is rotated in the reverse direction via the sliding pin 52, so that the first driving sector gear 40 integrated with the lever 32 causes the first driving sector gear 40 to be rotated first. The driven sector gear 46 is reversely rotated (rotated counterclockwise in FIG. 8), and the operating arm 49 presses the operating wire 43 to rotate the shift lever 16 of the hydrostatic continuously variable transmission 8 to the reverse side r. , Control the gear ratio steplessly. At this time, since the first drive sector gear 40 has a smaller diameter than the second drive sector gear 41, the rotation angle of the operating arm 49 due to the constant shift angle of the operation lever 26 is smaller than that during the travel, and thus the continuously variable transmission. The change in the gear ratio of 8 is slow.
[0029]
Also during this time, since the sliding pin 52 is loosely moved in the arc-shaped lost motion hole 63 of the third operating lever 33, the third operating lever 33 is kept in an inoperative state and the second clutch 22 is kept in an on state.
[0030]
Therefore, the power of the engine 7 is transmitted to the axle 12 and the wheel 13 via the primary drive unit 11, the hydrostatic continuously variable transmission 8 and the wheel drive unit 15 and reversely rotated. You can reverse.
[At the time of tillage work] (Refer to FIG. 4, FIG. 6, FIG. 8 and FIG. 10)
When the first clutch 21 is in the on state, the operation lever 26 is rotated to the tillage work position C along the selection path Se. Then, as shown in FIG. 6, the sliding pin 52 moves rightward and is detached from the connecting hole 60 of the second operating lever 32, while the connecting holes of the fourth and fifth operating levers 34, 35. 61 and 62 (see FIG. 4). Therefore, when the operation lever 26 is shifted toward the front F, the fourth and fifth operation levers 34 and 35 are rotated in the forward direction via the sliding pin 52. According to the rotation of the fourth operating lever 34 in the positive direction, the speed change lever 16 of the hydrostatic continuously variable transmission 8 is turned to the forward f side by the same action as the above [during travel], and the gear ratio is changed. Is continuously controlled to the top side, and when the fifth operating lever 35 is rotated, the operating wire 44 is pulled and the third clutch 23 is turned on.
[0031]
Also during this time, since the sliding pin 52 is loosely moved in the arc-shaped lost motion hole 63 of the third operating lever 33, the third operating lever 33 is kept in an inoperative state and the second clutch 22 is kept in an on state.
[0032]
Therefore, the power of the engine 7 is transmitted to the axle 12 and the wheel 13 via the primary drive unit 11, the hydrostatic continuously variable transmission 8 and the wheel drive unit 15 to rotate it forward, and at the same time, the rotary drive unit. It is also transmitted to the rotary shaft 17 via 19 and the rotary working machine 18 can be driven.
[When the wheel is freely released] (See FIGS. 4, 7, 9 and 10)
For example, during a tilling operation, only the power transmission to the wheel 13 is temporarily interrupted and the wheel 13 can be released freely by turning the airframe 1 so that the operation lever 26 is moved to the select path Se while the first clutch 21 is on. Is rotated to the wheel free release position W along Then, as shown in FIG. 7, the sliding pin 52 is detached from both the connecting holes 60 and 61 of the second and fourth actuating levers 32 and 34. Therefore, when the operating lever 26 is largely shifted toward the front F, the sliding pin 52 finally presses the one end wall of the lost motion hole 63 of the third operating lever 33 to rotate the third operating lever 33. It becomes like this. The rotation of the third operating lever 33 is transmitted to the control shaft 27 via the key 36 and further to the first operating lever 31 and pulls the operating wire 30, so that the second clutch 22 is turned off. .
[0033]
Therefore, power transmission from the continuously variable transmission 8 to the axle 12 is cut off, the wheels 13 can be freely rotated, and the airframe 1 can be easily handled.
[When dead man]
Regardless of the position of the operating lever 26, when the operator releases his hand from the deadman lever 28, the operating wire 30 is loosened, the first clutch 21 is turned off, and the continuously variable transmission from the engine 7. Power transmission to 8 is cut off. Therefore, the rotation of the wheel 13 and the rotary work machine 18 can be stopped immediately.
[0034]
In any of the above operations, the output of the engine 7 is controlled by a throttle lever (not shown) as usual.
[0035]
By the way, as described above, control of traveling, reverse traveling, tilling work, and free wheel release is easily performed by one operating lever 26. Further, during traveling and tilling work, the operating lever 26 is moved from the neutral position N toward the front F. When the vehicle is moving backward, the vehicle is shifted toward the rear B, which is opposite to the above, so that each of the above-mentioned driving operations can be performed accurately, and it can contribute to prevention of an erroneous operation during forward / backward movement.
[0036]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the shift direction of the operation lever 26 at the time of free wheel release can be backward as in the case of reverse travel.
[0037]
【The invention's effect】
According to the onset light as described above, a single operating lever to the body, which is mounted so as to move the select path along the lateral direction of the machine body, a shift path along the longitudinal direction of the airframe, the select path Has a neutral position at the midpoint of the shift path, and when the operating lever is shifted forward from the neutral position at the traveling position, the wheel is driven forward, and the operating lever is moved to the tilling work position. The wheel and rotary work machine are driven when shifting forward, and the wheel is driven backward when the operating lever is shifted backward in the reverse position, so that a single operating lever controls the running, reverse and tilling operations. It is easy to carry out and is effective in reducing the fatigue of the operator. Shifts towards the Luo forward, during reverse travel, from those so shifted toward the opposite of the rear, can be carried out accurately each driving operation, it is effective to forward and backward error prevention.
[0039]
Also, especially in the select route, a wheel free release position is provided along with the travel position and the tillage work position, and when the operation lever is shifted forward or backward at the wheel free release position, the power transmission to the wheel is cut off. Not only traveling, reverse and tilling operations, but also wheel free release control can be performed with the same operating lever, which can contribute to improved operability.
[Brief description of the drawings]
FIG. 1 is a side view of a power cultivator provided with an operation device according to the present invention.
FIG. 2 is a side view of the driving operation device.
3 is a cross-sectional view taken along line 3-3 in FIG. 2 (during traveling).
4 is an enlarged view of a main part of FIG.
FIG. 5 is a diagram for explaining the operation during reverse travel.
FIG. 6 is an explanatory diagram of an action at the time of tillage work.
FIG. 7 is an operation explanatory diagram when a wheel is freely released.
8 is a cross-sectional view taken along line 8-8 in FIG.
9 is a cross-sectional view taken along line 9-9 in FIG.
10 is a view taken in the direction of arrow 10 in FIG. 3;
[Explanation of symbols]
B ... Back C ... Tilling work position D ... Traveling position F ... Forward N ... Neutral position R ... Reverse position Se ... Select path Sh ... -Shift path T ... Power tiller W ... Wheel free release position 1 ... Machine body 13 ... Wheel 18 ... Rotary work machine 24 ... Driving operation device 26 ... Operation lever

Claims (1)

A single operating lever (26) is moved to the fuselage (1), which moves along a select path (Se) along the left-right direction of the fuselage (1) and a shift path (Sh) along the front-back direction of the fuselage (1). The travel position (D) and the tillage work position (C) are arranged side by side on the selection path (Se), and the neutral position (N) is provided at the intermediate point on the shift path (Sh). 26) is shifted from the neutral position (N) to the front (F) at the traveling position (D), the wheel (13) is driven forward, and the operation lever (26) is shifted to the front (F) at the tillage work position (C). Then, the wheel (13) and the rotary working machine (18) are driven, and when the operation lever (26) is shifted backward (B) in the reverse drive position (R), the power tiller is driven backward. Driving operation device There,
The select path (Se) is provided with a wheel free release position (W) along with the travel position (D) and the tillage work position (C), and the operation lever (26) is moved forward (F) at the wheel free release position (W). ) Or rearward (B), the power transmission to the wheel (13) is cut off when the shift is made to the rear (B) .

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