JP2001161103A - Operation device of power tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the operation of a power tiller by enabling the control of traveling motion, backward motion and tilling work with a single operation lever. SOLUTION: The single operation lever 26 is attached to a machine body 1 in a manner to be movable along a select path Se directing in the lateral direction of the body 1 and a shift path Sh directing in the longitudinal direction of the body 1. The select path Se has a traveling position D and a tilling work position C and the shift path Sh has a neutral position N at the middle point. The wheel 13 is driven forward by shifting the operation lever 26 forward F at the traveling position D, the wheel 13 and a rotary working machine 18 are driven by shifting the operation lever 26 forward F at the tilling work position C and the wheel 13 is driven backward by shifting the operation lever 26 backward B at the retreating position R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation and operation device for a power cultivator for controlling running, backward movement, tilling work, and the like of a power cultivator.

[0002]

2. Description of the Related Art A power cultivator is generally provided with a reverse switching device and a rotary clutch for enabling rotation of a rotary work machine before forward and reverse rotation of wheels is possible. In this system, the front / reverse switching device and the rotary clutch are operated by individual operation levers.

[0003]

As described above, operating the forward / reverse switching device and the rotary clutch with separate operating levers complicates the driving operation and increases operator fatigue.

The present inventors have been made in view of such circumstances, and have attempted to simplify the driving operation by controlling the row, reverse and tillage operations with a single operation lever.
It is an object of the present invention to provide a power cultivator that can contribute to reducing fatigue of workers.

[0005]

In order to achieve the above-mentioned object, the present invention provides a single operating lever for an airframe, which includes a select path along the horizontal direction of the airframe and a shift path along the longitudinal direction of the airframe. The traveling position and the tilling work position are arranged side by side on the select route, the neutral position is provided at the intermediate point on the shift route, and when the operating lever is shifted forward from the neutral position in the traveling position, the wheels are moved. The first feature is that the wheels and the rotary work machine are driven when the operation lever is shifted forward in the tilling operation position when the operation lever is driven forward, and the wheels are driven backward when the operation lever is shifted rearward in the reverse position. I do.

[0006] According to the first feature, the control of traveling, backward movement and tilling work can be easily performed by a single operation lever, so that it is effective for reducing the fatigue of the worker, and also during running and tilling. At the time of work, the operating lever is shifted forward from the neutral position, and at the time of reversing, it shifts backward, opposite to them, so that each of the above-mentioned driving operations can be performed accurately, preventing erroneous operation of moving forward and backward. Is also effective.

[0007] In addition to the above features, the present invention further provides a wheel free release position along with the traveling position and the tilling work position on the select path, and shifts the operation lever forward or backward in the wheel free release position to the wheel. The second feature is that the power transmission is interrupted.

[0008] According to the second feature, not only the running, the backward movement and the tilling work, but also the control of the free release of the wheels can be performed with the same operating lever, which can contribute to the improvement of operability.

[0009]

Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

FIG. 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 sectional view taken along line 3-3 in FIG. FIG. 4 is an enlarged view of a main part of FIG. 3, FIG. 5 is an operation explanatory view at the time of reverse travel, FIG. 6 is an operation explanatory view at the time of tilling work, FIG.
8 is a sectional view taken along line 8-8 of FIG. 3, FIG. 9 is a sectional view taken along line 9-9 of FIG. 3, and FIG. 10 is a view taken along arrow 10 of FIG.

First, as shown in FIG. 1, a body 1 of a power cultivator T includes a reduction case 2 extending in a vertical direction,
A frame 3 protruding from the front of the case 2 and a transmission case 4 connected to the upper part of the reduction case 2
A rotary case 5 detachably connected to a rear portion of the transmission case 4; and a loop-type steering handle 6 attached to an upper portion of the transmission case 4 and extending rearward.
It is composed of

An engine 7 is mounted on the frame 3 and a transmission case 4 houses a hydrostatic continuously variable transmission 8. A crankshaft 9 of the engine 7 and an input shaft 10 of the continuously variable transmission 8 are connected by a belt. It is connected via a primary drive 11 of the formula. The reduction case 2 supports the axle 12 at the other end, and the axle 12 and the output shaft 1 of the continuously variable transmission 8.
4 is accommodated. The axle 12 is provided with wheels 13.

The rotary case 5 supports a rotary shaft 17 at a lower end thereof and connects the rotary shaft 17 to the output shaft 14 of the continuously variable transmission 8.
9 are accommodated. A rotary work machine 18 is mounted on the rotary shaft 17.
Is taken.

The hydrostatic stepless transmission 8 is a known type in which a variable displacement swash plate type hydraulic pump and a fixed displacement swash plate type hydraulic motor are connected via a hydraulic closed circuit. The input shaft 10 is connected to the hydraulic motor, and 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 rotation speed of the output shaft 14 is increased from zero in 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.

The primary drive device 11 has a tension type first clutch 2 which can turn on and off a transmission path of the drive force.
1 is provided, the wheel drive unit 15 is provided with a second clutch 22 capable of turning on and off the transmission path of the driving force, and the rotary drive unit 19 is turned on and off of the transmission path of the driving force. A third clutch 23 is provided.

As shown in FIGS. 2 to 4, the steering handle 6
Is mounted with the driving operation device 24 of the present invention. The operation device 24 has a casing 25 fixed to the operation handle 6, and a control shaft 27 is rotatably supported on both left and right side walls. At both ends of the control shaft 27 protruding outside the casing 25, both ends of a deadman lever 28 which can be gripped together with the steering handle 6 are rotatably supported. The deadman lever 28 has a link 29 and an operation wire 30. The first clutch 21 is connected via the. The first clutch 21 is turned off when the operating wire 30 is relaxed, and turned on when towing.

In the casing 25, a control shaft 27 is provided.
3 and 4, the first operating lever 31 is spline-fitted to the shaft 27, the second operating lever 32 is rotatably fitted to the shaft 27, and the key 36 is Operating lever 33, which is coupled through
7, a fourth operating lever 34 and a fifth operating lever 35 rotatably fitted to the shaft 27 are provided. The second operating lever 32 has a first
The drive sector gear 40 and the fourth operating lever 34
The second drive sector gears 41 having a larger diameter than the first drive sector gear 40 are formed integrally.

The first operating lever 31 has an operating wire 42
The second clutch 22 is connected to the clutch 22 via an opening, and the clutch 22 is turned on when the operating wire 42 is relaxed and turned off when the operation wire 42 is pulled.

A support shaft 45 parallel to the control shaft 27 is mounted on both left and right side walls of the casing 25, and the first and second drive sector gears 40 and 41 are engaged with the support shaft 45 on the shaft 45. A driven sector gear assembly 48, which is formed by integrally coupling the two driven sector gears 46 and 47, is provided rotatably. The sector gear assembly 48 is integrally provided with an operating arm 49, to which the shift lever 16 of the hydrostatic continuously variable transmission 8 is connected via a push-pull type operating wire 43. The operation wire 43 is turned to the forward side f by pulling and the operation wire 43 is turned to the reverse side r by pressing of the operation wire 43.

The third clutch 23 is connected to the fifth operating lever 35 via a link 50 and an operating wire 44, and the clutch 23 is turned on when the operating wire 44 is relaxed and turned off when the tow is pulled.

The bracket 37 is provided with a pivot 51 disposed in a direction perpendicular to the control shaft 27 and a sliding pin 52 slidable in parallel with the control shaft 27. 26a is rotatably supported.

An operating arm 55 having a connecting hole 56 is formed integrally with the boss 26a of the operating lever 26.
A connecting pin 57 slidably fitted in the connecting hole 56 is
It is fixed to the slide pin 52 through the long hole 58 of the bracket 37. The long hole 58 is arranged in parallel with the slide pin 52. Thus, the operation lever 26 can move a select path Se around the pivot 51 along the left-right direction of the body 1 and a shift path Sh around the control axis 27 along the front-back direction of the body 1 ( According to the movement of the operation lever 26 along the select path Se, the sliding pin 52 can be slid right and left in FIG. In the select route Se, in order from the left side in FIG.
And a reverse position R. Further, according to the rotation of the operation lever 26 on 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 set at the intermediate point of the shift path Sh.
Is provided. Therefore, the operation lever 26 can move forward F and backward B from the neutral position N.

As shown in FIGS. 4 and 8, a sliding pin 52 is detachably fitted to the second operating lever 32, the fourth operating lever 34, and the fifth operating lever 35. Circular connection holes 60, 61, 62 are provided. Further, the second operation lever 32 is provided with a lost motion hole 63 into which the sliding pin 52 is always fitted, and the lost motion hole 63 has an arc shape concentric with the control shaft 27 as shown in FIG. In addition, the rotation of the sliding pin 52 at a fixed angle around the control shaft 27 is not transmitted to the third operating lever 33.

An operation panel 64 for covering the upper surface of the casing 25 is attached to the casing 25. The operation panel 64 is provided with a restriction groove 65 with which the operation lever 26 is engaged, whereby the select route Se of the operation lever 26 is limited to the neutral position N, the tilling operation position C, the traveling position D, and the wheel free release position. The shift path Sh at W is limited from the neutral position N to the front F side, and the shift path Sh at the reverse position R is limited from the neutral position N to the rear B side.

Next, the operation of this embodiment will be described. [Driving] (See FIGS. 3, 4, 8, and 10) As shown in FIGS. 3 and 4, first, the operation lever 26 is placed in the neutral position N and the deadman lever 28 is turned on.
Is gripped together with the steering handle 6, thereby pulling the operating wire 30 to turn the first clutch 21 on. Next, the operation lever 26 is turned to the traveling position D along the select route Se. Then, the sliding pin 52 controlled by the operation lever 26 is detached from the connection hole 60 of the second operation lever 32, and is fitted into the connection hole 61 of the fourth operation lever 34. F
, The fourth operating lever 34 is rotated in the forward direction via the sliding pin 52, so that the lever 34
The second driven sector gear 47 is rotated forward (rotated clockwise in FIG. 8) by the second drive sector gear 41 integrated with the second drive sector gear 41. By rotating the lever 16 to the forward side f, the speed ratio is steplessly controlled to the top side.

During this time, since the sliding pin 52 moves freely in the arc-shaped lost motion hole 63 of the third operating lever 33, the third operating lever 33 maintains the inoperative state,
The on state of the clutch 22 is maintained.

Therefore, the power of the engine 7 is controlled by the primary drive unit 11, the hydrostatic continuously variable transmission 8 and the wheel drive unit 1.
The power cultivator T is transmitted to the axle 12 and the wheels 13 via the wheel 5 to rotate the power rotator T forward.

In this case, when the rotary work machine 18 hinders the traveling of the power cultivator T, the rotary case 5 is detached from the transmission case 4. [Reverse] (See FIGS. 4, 5, 8, and 10) When the first clutch 21 is in the on state, the operation lever 26
To the reverse position R along the select route Se.
Then, as shown in FIG. 5, the sliding pin 52 moves to the left and fits into the connection hole 60 of the second operation lever 32 (see FIG. 4), and from the connection hole 61 of the fourth operation lever 34. break away. Therefore, when the operating lever 26 is shifted toward the rear B, the second operating lever 32 is rotated in the opposite direction via the sliding pin 52, so that the first driving sector gear 40 integrated with the lever 32 causes the first operating sector gear 40 to rotate. The driven sector gear 46 is reversed (rotated counterclockwise in FIG. 8), and the operating arm 49 presses the operating wire 43 to rotate the transmission lever 16 of the hydrostatic continuously variable transmission 8 to the reverse side r. , The gear ratio is steplessly controlled. At this time, the first drive sector gear 40
Since the diameter of the second drive sector gear 41 is smaller than that of the second drive sector gear 41, the rotation angle of the operation arm 49 at a constant shift angle of the operation lever 26 is smaller than that during the traveling, and thus the change in the gear ratio of the continuously variable transmission 8 is slow. .

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 is kept in the inactive state and the second clutch 22 is turned on. maintain.

Therefore, the power of the engine 7 is controlled by the primary drive unit 11, the hydrostatic continuously variable transmission 8 and the wheel drive unit 1.
The power tiller T is transmitted to the axle 12 and the wheels 13 via the wheel 5 and is reversed, so that the power cultivator T can be moved backward. [Tilling work] (See FIGS. 4, 6, 8, and 10) In the ON state of the first clutch 21, the operation lever 26
Is rotated to the tilling work position C along the select route Se. Then, as shown in FIG. 6, the sliding pin 52 moves rightward and separates from the connection hole 60 of the second operation lever 32, while connecting holes of the fourth and fifth operation levers 34 and 35. 61 and 62 (see FIG. 4). Then, when the operating lever 26 is shifted toward the front F, the fourth and fifth operating levers 34 and 35 are rotated in the forward direction via the sliding pins 52. According to the rotation of the fourth operating lever 34 in the forward direction, the shift lever 16 of the hydrostatic continuously variable transmission 8 is rotated toward the forward f side by the same operation as in [running], and
The gear ratio is steplessly controlled to the top side, and according to the rotation of the fifth operating lever 35, the operating wire 44 is pulled,
The third clutch 23 is turned on.

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 maintains the inoperative state and the second clutch 22 is turned on. maintain.

Therefore, the power of the engine 7 is controlled by the primary drive unit 11, the hydrostatic continuously variable transmission 8 and the wheel drive unit 1.
5 and transmitted to the axle 12 and the wheels 13 and forwardly, and simultaneously transmitted to the rotary shaft 17 via the rotary drive device 19 to drive the rotary working machine 18. [When the wheels are released freely] (See FIGS. 4, 7, 9, and 10) For example, during tilling work, due to the turning of the body 1, only the power transmission to the wheels 13 is temporarily cut off and the wheels 13 are released freely. When the first clutch 21 is in the ON state, the operation lever 26 is moved along the select path Se to the wheel free release position W.
To rotate. Then, as shown in FIG.
Are connecting holes 60 of the second and fourth operating levers 32, 34,
Depart from 61. Therefore, when the operating lever 26 is largely shifted toward the front F, the sliding pin 52 finally pushes one end wall of the lost motion hole 63 of the third operating lever 33 to rotate the third operating lever 33. Become like 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 to pull the operating wire 30.
To the off state.

Therefore, the power transmission from the continuously variable transmission 8 to the axle 12 is cut off, and the rotation of the wheels 13 becomes free.
The body 1 can be easily handled. [At the time of the deadman] Regardless of the position of the operation lever 26, when the operator releases the hand from the deadman lever 28,
When the operation wire 30 is relaxed, the first clutch 21 is turned off, and power transmission from the engine 7 to the continuously variable transmission 8 is cut off. Therefore, the rotation of the wheels 13 and the rotary work machine 18 can be immediately stopped.

In any of the above operations, the output of the engine 7 is controlled by a throttle lever (not shown) as in the conventional case.

By the way, as described above, the control of the running, the backward movement, the tilling operation and the free release of the wheels can be easily performed by one operating lever 26. In addition, during the running and the tilling operation, the operating lever 26 is moved forward from the neutral position N. Since the vehicle shifts toward F and shifts toward the rear B, which is the opposite direction when the vehicle moves backward, each of the above-described driving operations can be performed accurately, which can contribute to preventing erroneous operation of moving forward and backward.

The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the operation lever 26 when the wheels are released freely
Can be set backward as in reverse.

[0037]

As described above, according to the first aspect of the present invention, a single operation lever is provided on the fuselage to select a selection route along the left-right direction of the aircraft and a shift route along the front-rear direction of the aircraft. It is mounted so that it can be moved, the running position and the tilling work position are arranged side by side on the select route, the neutral position is provided at the intermediate point on the shift route, and the wheel moves forward when the operating lever is shifted forward from the neutral position in the running position When the operating lever is shifted forward in the tilling work position, the wheels and the rotary work machine are driven. When the operating lever is shifted backward in the reverse position, the wheels are driven in reverse. Control can be easily performed with a single operating lever, which is effective in reducing operator fatigue. The lever shifts forward from the neutral position and shifts backward when reverse, so that each of the above-mentioned driving operations can be performed accurately, and it is also effective in preventing erroneous operation when moving forward and backward. .

According to a second feature of the present invention, a free wheel release position is provided in the select route along with the running position and the tilling work position, and when the operation lever is shifted forward or backward in the free wheel release position, the wheel is released. The second feature is that power transmission to the motor is cut off.

According to the second feature, not only the running, the backward movement, and the tilling work, but also the control of the free release of the wheels can be performed with the same operating lever, which can contribute to the improvement of the operability.

[Brief description of the drawings]

FIG. 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 sectional view taken along line 3-3 in FIG. 2 (during running).

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is an explanatory diagram of the operation when the vehicle is moving backward.

FIG. 6 is an explanatory view of an operation during a tilling operation.

FIG. 7 is an explanatory diagram of the operation when the wheels are freely released.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 3;

FIG. 9 is a sectional view taken along line 9-9 of FIG. 3;

FIG. 10 is a view taken in the direction of arrow 10 in FIG. 3;

[Explanation of symbols]

 B ··· Rear C · · · Tilling work position D · · · · travel position F · · · · · N · · · neutral position R · · · · reverse position Se · select path Sh · · · · Shift path T · · · Power tiller W · · · · Wheel free release position 1 · · · · Body 13 · · · Wheel 18 · · · Rotary work machine 24 · · · operation operation device 26 · · · operation lever

Claims (2)

[Claims] 1. A single operating lever (26) on a fuselage (1)
Is mounted so that it can move a select route (Se) along the left-right direction of the body (1) and a shift route (Sh) along the front-rear direction of the body (1), and travel on the select route (Se). The position (D) and the tilling work position (C) are juxtaposed, the shift path (Sh) is provided with a neutral position (N) at an intermediate point, and the operating lever (26) is moved to the neutral position (N) at the traveling position (D). ) From the front (F)
When the wheel (13) is shifted forward, the wheel (13) is driven forward, and when the operating lever (26) is shifted forward (F) in the tilling operation position (C), the wheel (13) and the rotary working machine (18) are shifted.
The driving operation device of the power cultivator, wherein the wheel (13) is driven backward when the operating lever (26) is shifted rearward (B) in the reverse position (R). 2. A driving operation device for a power cultivator according to claim 1, wherein the traveling position (D) is located on the select route (Se).
A wheel free release position (W) is provided alongside the tilling work position (C) and the operation lever (26) is shifted forward (F) or rearward (B) at the wheel free release position (W) to produce a wheel (13). Power cultivator operation control device, characterized in that power transmission to the power cultivator is cut off.