JPH11123943A - Power control device for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To favorably control the rotating driving force of a PTO shaft by driving the PTO shaft in rotation by the driving force transmitted from an engine through main and sub-transmissions in a traveling vehicle such as a tractor or the like constructed so that an engine is loaded in the front and a work machine is installed in the rear. SOLUTION: A transmission system for driving a PTO shaft 8 in rotation for transmitting power to a work machine such as a rotary tiller or the like is taken from the downstream side of a sub-transmission for traveling. That is, the power of an engine 5 is transmitted through a clutch 6, a main transmission 22, and a sub-transmission 21 to the PTO shaft 8 in the PTO transmission 23. The power is transmitted to the rear wheel 4 through a forward-backward switching device 24 branching off from the sub-transmission 21 and a differential gear 25 in a differential gear case. Thus, the rotating speed of the PTO shaft 8 can be varied arbitrarily by the PTO transmission 23, and in the case of backward movement, the PTO shaft 8 can be rotated in a fixed direction so as to improve work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the rotational driving force of a PTO shaft for transmitting power to a working machine such as a rotary cultivator connected to and pulled by a traveling vehicle such as a tractor.

[0002]

2. Description of the Related Art Conventionally, a working machine such as a rotary cultivator which is connected and towed behind a traveling vehicle such as a tractor,
PT driven by power transmitted directly from the engine
It operates by the rotational driving force of the O-axis. Therefore, the rotational speed is often constant regardless of the vehicle speed (shift).

[0003]

However, the speed of the work has increased the traveling speed range, and the frequency of switching the speed of the PTO shaft has increased due to conditions and the like. Has increased, the PTO
There is a problem that the shaft speed cannot be synchronized.
Further, in fertilization and sowing work, more accurate vehicle speed synchronization is desired. Therefore, an object of the present invention is to provide a power control device that can suitably control the rotational driving force of a PTO shaft that transmits power to a working machine such as a rotary tiller.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides the following power control device for a working machine. That is, in a traveling vehicle such as a tractor equipped with an engine in the front and a work machine in the rear, the PTO shaft that drives the work machine is driven by the driving force transmitted from the engine via the main transmission and the auxiliary transmission. A power control device for a working machine, wherein the power control device is configured to be driven to rotate. Also, in a traveling vehicle such as a tractor equipped with an engine in the front and a work machine in the rear, a one-way clutch determines whether the driving force is transmitted from the engine via the HST transmission or the driving force transmitted directly from the engine. A power control device for a working machine, wherein the driving force selected by the one-way clutch is controlled by an electromagnetic clutch. The transmission is transmitted to the PTO shaft via the PTO shaft.

[0005] In a traveling vehicle such as a tractor having an engine mounted on the front and a working machine mounted on the rear, the driving force transmitted from the engine via the main transmission and the auxiliary transmission is transmitted from the engine to the HST transmission. The PT is driven by the speed reducer controlled by the driving force transmitted through the PT and drives the work implement with the corrected driving force.
In a power control device for a working machine, wherein the O-axis is configured to be driven to rotate, or in a traveling vehicle such as a tractor equipped with an engine in front and a working machine in rear, The driving force transmitted through the transmission and the auxiliary transmission is corrected by a speed sensor attached to the traveling vehicle body or the working machine, and the PTO shaft that drives the working machine is rotationally driven by the corrected driving force. This is a power control device for a working machine, characterized in that it is configured as described above.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on examples shown in the drawings. First, a tractor working machine shown in FIG. 1 will be described. (1) is a tractor body which is a traveling vehicle, and (2) is a rotary cultivator which is an example of a working machine connected to a rear portion of the tractor body (1). It is. (3) is a front wheel, (4) is a rear wheel, an engine (5) mounted on a front part of the tractor body (1), a clutch in a clutch case (6) and a transmission in a transmission case (7). The power is transmitted through the power supply to drive. Further, power is transmitted from the engine (5) to the PTO shaft (8) via the clutch in the clutch case (6) and the transmission in the transmission case (7), and the power is transmitted to the rear of the machine by the PTO shaft (8). The tilling claw shaft (10) mounted on the tilling transmission case (9) of the rotary tiller (2) is driven to rotate, and the tilling claw (11) rotates.

The rotary tiller (2) has a lower end of a lifting link (14) pivotally attached to the tip of a lift arm (13) driven up and down by a lifting hydraulic device (12). The tilling transmission case (9) of (2) and the lower link (15) connecting between the tractor body (1) and the lower link (15) are pivotally connected to the upper frame (16) of the rotary cultivator (2). Tractor body (1)
Is connected by a top link (17), and is moved up and down by the vertical movement of a lift arm (13), so that the height can be adjusted. The top link (17) and the lower link (15) are rotatable with respect to the tractor body (1) and the rotary tiller (2), and the lifting hydraulic device (12) includes an engine (5). The hydraulic pressure is supplied from a hydraulic pump (not shown) which is rotated by the driving force. The rotary cultivator (2) is swingable in the left and right body width directions by a hydraulic cylinder (18) provided on one of the lifting links (14) so that the inclination in the left and right directions can be changed. Has become. In addition, (19) is a steering wheel,
(20) is a cockpit.

Next, a description will be given of a transmission path of power from the engine (5) to the rear wheel (4) and the PTO shaft (8) in the tractor working machine having the above configuration. In the present invention, the transmission system for rotating and driving the PTO shaft (8) is provided from the downstream side of the traveling auxiliary transmission (21). That is, as shown in FIG. 2, the power transmission path of the PTO shaft (8) extends from the engine (5) through the clutch case (6), the main transmission (22), and the auxiliary transmission (21). The transmission is transmitted to a PTO shaft (8) inside the rear transmission (23), and the power transmission path of the rear wheel (4) is a forward / reverse switching device (24) branched from the auxiliary transmission (21).
The power is transmitted to the rear wheel (4) via a differential device (25) in the differential case. In the present invention,
A PTO shaft (8) is arranged downstream of the traveling auxiliary transmission (21) via a PTO transmission (23) so that the rotation speed of the PTO shaft (8) changes according to the traveling speed. And the PTO transmission (23)
The rotation speed of the shaft (8) is changed. Therefore, the PTO shaft (8) can be rotated in a fixed direction even when the vehicle is moving backward.

On the other hand, in the case of the HST mission,
As shown in FIG. 3, the power from the engine (5) is supplied to the clutch case (6), the main clutch (26), the HST pump (27), the HST motor (28), and the differential (25).
And transmitted to the rear wheel (4) via
The power is further transmitted from the HST motor (28) to the PTO shaft (8) in the PTO transmission (23) via the one-way clutch (29) and the electromagnetic clutch (30). The one-way clutch (29) is configured to select between the low-speed constant rotation output directly connected to the engine and the output from the HST motor (28) directly transmitted from the main clutch (26).

According to the transmission path configured as described above,
The rotation of the PTO shaft (8) is shifted in synchronism with the vehicle speed, and when the vehicle is traveling at an extremely low speed or in reverse, the one-way clutch (29) is switched to output the constant rotation output from the engine (5). Can be transmitted to the PTO shaft (8), which can prevent poor transfer performance of the seeding machine or the like at low speeds and can prevent reverse rotation transmission during reverse travel. At this time, since the electromagnetic clutch (30) is provided on the path transmitted from the one-way clutch (29) to the PTO transmission (23),
When the ST shift is in neutral or reverse, the electromagnetic clutch (30) is controlled by turning it off and the like.
The rotation of the shaft (8) can be stopped appropriately. Therefore, safety during work can be sufficiently ensured, and energy can be saved.

In addition, the power transmission path shown in FIG.
When the PTO shaft rotation correction mechanism (31) including the T pump (27), the HST motor (28), and the planetary reduction gear (32) is provided, the tilling pitch in the rotary cultivator (2) can be made constant. That is, as shown in FIG. 4, a planetary speed reducer (32) including a ring gear (33) is disposed downstream of the auxiliary transmission (21) and in front of the PTO transmission (23). The HST pump (2) in which the ring gear (33) of the reduction gear (32) is further branched from the main transmission (22) via the main clutch (26).
7), to be operated by the HST motor (28). With this configuration, the rotation of the PTO shaft (8) can be directly driven by the HST motor (28), and the rotation of the PTO shaft (8) is
By adjusting the rotation of the ST motor (28),
Correction can be made appropriately. Therefore, it becomes possible to make the rotary tilling pitch constant regardless of the vehicle speed. When the HST shift is neutral, the operation is the same as that described with reference to FIG.

Also, as shown in FIG. 1, a speed sensor (34) such as a ground speed meter is provided on the tractor body (1) or the rotary cultivator (2), thereby providing a PTO.
When the rotation of the shaft (8) is configured to be further corrected, the rotation of the PTO shaft (8) can be controlled in proportion to the moving speed of the rotary cultivator (2) regardless of the tire slip and the number of gears. The accuracy of operations such as sowing and fertilization can be improved. That is, P
Because the rotation of the TO shaft (8) can be changed, the rotary tilling pitch can be kept constant regardless of tire slip, etc., and the rotary tilling pitch (the number of rotations of the PTO shaft) can be changed according to the field conditions and work purpose. Will be able to The speed sensor (34) is preferably installed on the lower surface of the central part of the tractor body (1), and it is preferable to use a radar or an ultrasonic sensor. With such a sensor, it is possible to detect even in wet fields, and it is less affected by shaking of the aircraft.

Further, instead of the speed sensor (34),
Gauge foil (35) in front of rotary tiller (2)
When the rotary cultivator (2) is ascending (the gauge wheel (35) is not in contact with the ground) ), The rotation of the PTO shaft (8) can be stopped. In addition, it is also possible to provide a gauge wheel on both sides and detect the number of revolutions from the two gauge wheels to obtain an average speed, and in this case, it is possible to suppress variations in turning work. When the gauge wheel (35) is configured to be supported from the fuselage side, it is also effective for a tractor or the like traveling by a crawler, and is also effective for a spin turn.

In any case, according to the present invention, P
Since the rotational driving force of the TO shaft can be suitably controlled by, for example, synchronizing it with the vehicle speed, it is possible to perform agricultural operations such as seeding and fertilizing with high accuracy and in an optimal state. It also controls the rotation of the PTO shaft regardless of vehicle speed,
Since the rotation of the O-axis can be appropriately corrected, the working range can be expanded, and the working accuracy can be further improved. Needless to say, the present invention is not limited to those shown in the drawings, and the design can be appropriately changed within the spirit of the present invention.

[0015]

According to the present invention, the PTO shaft for driving the working machine is rotated by the driving force transmitted from the engine via the main transmission and the auxiliary transmission. The rotation of the PTO shaft can be controlled by tuning, so that sowing and fertilization can be performed with high accuracy. In the case of an HST transmission, a one-way clutch is used to select a driving force transmitted from the engine via the HST transmission or a driving force transmitted directly from the engine, and a PTO that drives the work implement is selected.
Since the shaft is configured to be driven to rotate, the rotation of the PTO shaft can be controlled in synchronization with the vehicle speed,
The rotation of the PTO shaft can be controlled irrespective of the vehicle speed, and the working range can be further expanded.
The driving force selected by the one-way clutch is transmitted to the PTO shaft via the electromagnetic clutch.
The transmission to the shaft can be cut off, which is safe and leads to energy saving.

The driving force transmitted from the engine via the main transmission and the auxiliary transmission is transmitted from the engine to the HST.
A correction is made by a speed reduction device controlled by a driving force transmitted through a transmission, and the corrected driving force is used to rotate the PTO shaft that drives the work machine, The driving force transmitted through the main transmission and the auxiliary transmission is corrected by a speed sensor attached to the traveling vehicle body or the working machine, and the corrected driving force drives the PTO shaft that drives the working machine to rotate. As a result, the work accuracy can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a tractor working machine.

FIG. 2 is a transmission mechanism diagram showing a power transmission path.

FIG. 3 is a transmission mechanism diagram showing a power transmission path provided with an HST mission.

FIG. 4 is a transmission mechanism diagram illustrating a power transmission path including a correction mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor main body 2 Rotary tiller 3 Front wheel 4 Rear wheel 5 Engine 6 Clutch case 7 Transmission case 8 PTO shaft 9 Tilling transmission case 10 Tilling claw shaft 11 Tilling claw 12 Lifting hydraulic device 13 Lift arm 14 Lifting link 15 Lower link 16 Upper part Frame 17 Top link 18 Hydraulic cylinder 19 Steering handle 20 cockpit 21 Sub-transmission 22 Main transmission 23 PTO transmission 24 Switching device 25 Differential device 26 Main clutch 27 HST pump 28 HST motor 29 One-way clutch 30 Electromagnetic clutch 31 PTO Shaft rotation correction mechanism 32 Planetary reduction gear 33 Ring gear 34 Speed sensor 35 Gauge wheel

Claims (5)

[Claims] In a traveling vehicle such as a tractor having an engine mounted on the front and a work machine mounted on the rear, the work machine is driven by a driving force transmitted from the engine via a main transmission and a sub-transmission. A power control device for a working machine, wherein the PTO shaft is configured to be driven to rotate. 2. In a traveling vehicle such as a tractor with an engine mounted on the front and a work machine mounted on the rear, whether the driving force is transmitted from the engine via an HST transmission or the driving force transmitted directly from the engine is determined. A power control device for a working machine, wherein a PTO shaft for driving the working machine is selectively driven by a one-way clutch to rotate. 3. The power control device for a working machine according to claim 2, wherein the driving force selected by the one-way clutch is transmitted to a PTO shaft via an electromagnetic clutch. 4. In a traveling vehicle such as a tractor having an engine mounted on the front and a working machine mounted on the rear, a driving force transmitted from the engine via a main transmission and a subtransmission is transmitted from the engine to an HST transmission. The power of the work implement is characterized in that it is corrected by a speed reducer controlled by a drive force transmitted through the PTO shaft, and the PTO shaft that drives the work implement is rotationally driven by the corrected drive force. Control device. 5. In a traveling vehicle such as a tractor having an engine mounted on the front and a work machine mounted on the rear, a driving force transmitted from the engine via the main transmission and the auxiliary transmission is transmitted to the traveling vehicle body or the work vehicle. A power control device for a working machine, wherein the PTO shaft for driving the working machine is rotationally driven by the corrected driving force corrected by a speed sensor attached to the machine.