JP2000287505A - Speed-changing device of agricultural working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the transmission of power from a driving shaft to a following shaft to be readily exchanged in an agricultural working machine for carrying out a plowing operation or a mowing operation by normally or reversely rotating a rotary operation part. SOLUTION: A change gear box 4 has a driving shaft 24 for receiving power from a PTO shaft of a tractor, and a following shaft 25 and arranged in the front and rear direction in parallel, and change gears 39 and 40 are installed in the rear end sides of both the shafts 24 and 25 so as to be insertable and replaceable. Further, an idling shaft 30 is installed in the position not interfering with the outer periphery of both the change gears 39 and 40 in the agricultural working machine attached to the rear part of a tractor through a three-point link hitch structure so as to be freely lifted and lowered, and for carrying out the plowing operation or mowing operation by normally or reversely rotating a rotary operation part having many plowing or mowing blades arranged around a horizontally extended rotary shaft by receiving the power from the PTO shaft of the tractor to the change gear box 4. The power is transmitted from the driving shaft 24 through an idling gear 41 to the following shaft 25, or transmitted from the driving shaft 24 to the following shaft 25 by directly engaging both the change gears 39 and 40 by replacing the change gears 39 and 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural working machine for performing a tilling operation or a mowing operation by rotating a rotary working unit in a normal or reverse direction so that power transmission from a drive shaft to a driven shaft can be easily switched. Related to a transmission.

[0002]

2. Description of the Related Art Conventionally, a PTO of a tractor is mounted on a rear portion of a tractor via a three-point link hitch mechanism so as to be able to move up and down.
Agricultural work machines that receive power from the transmission gearbox from the shaft and rotate the rotary working part with a large number of tilling and mowing blades mounted around the axis of the rotating shaft that extends in the horizontal direction in forward and reverse directions to perform tilling or mowing work. It is well known.

In this conventional agricultural machine, two input shafts receiving power from a PTO shaft of a tractor of a transmission gear box are arranged in parallel, and two sets of a pinion and a bevel gear are combined.
There was a configuration in which a transmission joint from the O-axis was replaced, a configuration in which five transmission gears were combined and a shift operation was performed by a transmission lever, and the like.

[0004]

In all of the above, the structure of the transmission gear box is complicated, the size of the transmission is increased, the weight is heavy, and the manufacturing cost is increased. Also, since the transmission gear cannot be replaced, the desired rotation speed cannot be changed depending on the tractor to which the agricultural work machine is attached.
There was a problem. Further, in the case of a so-called two-point connection type in which an agricultural work machine is directly mounted on a tractor without using a three-point link hitch mechanism, a PT
There was a problem that the transmission joint from the O-axis could not be replaced.

[0005] The present invention relates to an agricultural work machine for performing a tilling operation or a mowing operation by rotating a rotary working unit having a large number of tilling and mowing blades mounted on the circumference of a rotary shaft in forward and reverse directions. Rotation switching can be easily performed, and the rotation speed of the rotary working unit is set to a low speed (20
0 rpm), and high speed rotation (1100
It is an object of the present invention to provide a transmission for an agricultural work machine which can cope with various tractors having different rotation speeds of the PTO shaft by exchanging change gears and can be manufactured at low cost.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is mounted on a rear portion of a tractor via a three-point link hitch mechanism so as to be able to move up and down, and power is transmitted from a tractor PTO shaft to a transmission gearbox. In a farm work machine that performs a plowing operation or a mowing operation by rotating a rotary working unit having a large number of tilling and reaping blades mounted around a shaft of a rotating shaft extending in a horizontal direction, the transmission gear box includes: A drive shaft and a driven shaft that receive power from the PTO shaft of the tractor are arranged side by side in the front-rear direction, and change gears are provided at the rear ends of these shafts so that they can be inserted and replaced. In addition to providing an idle shaft, power is transmitted from the drive shaft to the driven shaft via the idle gear, or the change gear is replaced, and both change gears are directly meshed with each other to change the drive shaft to the driven shaft. It is characterized in that so as to force transmission.

[0007]

With the above configuration, the transmission of the agricultural work machine of the present invention has the above configuration, and when the PTO shaft of the tractor is normally rotated and transmitted to the drive shaft of the transmission gearbox, the drive shaft and the driven shaft are connected. Since the idle gear meshes with the fitted change gear, power is transmitted from the drive shaft to the driven shaft via the idle gear, and the rotary working unit is rotated forward at high speed to perform mowing work. When performing tilling work, replace the change gears of the drive shaft and the driven shaft, directly mesh the two change gears, reduce the power from the drive shaft to the driven shaft, transmit power, and reversely rotate the rotary work unit at low speed. Tillage work.

[0008]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. 1 to 5, reference numeral 1 denotes a tilling and mowing machine having a long length in the left-right direction and a tilling and mowing function. The tilling / mowing machine 1 has a lower link connecting portion 2 which is provided at the front thereof with a top link and a lower link of a tractor (not shown), and which is connected to a well-known three-point link hitch mechanism in which the lower link rotates vertically by a hydraulic mechanism. (A top link connecting portion is not shown), and is attached to the rear of the tractor so as to be able to move up and down. Also, an input shaft 5 (FIG. 1) protruding forward from a transmission gear box 4 provided at the front left and right central portion of the tilling and mowing machine 1 from a PTO shaft of the tractor via a transmission portion 3 such as a universal joint and a transmission shaft. 3) is transmitted.

A transmission frame 6 having a transmission shaft 33 therein and a hollow support frame 7 extending horizontally are also provided on both left and right sides of the gear box 4 as a main body frame. A chain transmission case 8 is suspended from a side end of the transmission frame 6, and a side frame 9 is suspended from a side end of the support frame 7 so as to face the chain transmission case 8. A rotating shaft 10 is suspended between the lower end of the chain transmission case 8 and the lower end of the side frame 9.
A large number of tilling and mowing blades 11 are mounted on the circumference of the rotating shaft 10 in a radial direction to form a rotary working unit 12. The power transmitted to the gear box 4 is subjected to a gear change in the gear box 4, and the transmission shaft 33 is rotated to drive the rotation shaft 10 forward and reverse through the chain transmission case 8. Perform tillage or mowing work.

The upper side of the rotary working unit 12 is covered with a shield cover 13, which is provided with a side cover 14 at the left and right ends, a front cover 15 at the front, and a rear cover at the rear end. The front end of the rear cover 16 is pivotally mounted so as to be rotatable up and down. At both left and right ends of the rear end of the rear cover 16, gauge wheels 17 used when performing mowing work by the rotary work unit 12 are provided, and between the rear end of the rear cover 16 and the field scene. There is a predetermined gap. The gauge wheel 17 is not limited to a wheel, and may be a roller-shaped one or a sled-shaped one. When performing the tilling work by the rotary working unit 12, the gauge wheel 17 is removed. The work is performed with the lower end of the rear cover 16 in contact with the plowed surface.

On the upper surface of the rear cover 16, a plurality of connecting holes 1 are provided.
A connecting rod 18 having 8a is protruded, and the lower end of the sensor arm 19 is connected to the connecting rod 18 by selecting the connecting hole 18a. The upper end of the sensor arm 19 is pivotally attached to a rear end of a bell crank 20 pivotally supported by a support frame 21 via a shaft 22 so as to be able to rotate back and forth. The rear end of the hydraulic mechanism connecting rod 23 connected to the hydraulic mechanism of the point link hitch mechanism is pivotally mounted. The length of the hydraulic mechanism connecting rod 23 can be adjusted. When the rear cover 16 swings up and down, the swing is sensed by the connecting rod 18 and the sensor arm 19, and the bell crank 20 and the hydraulic mechanism connecting rod 23
To move the tilling and mowing machine 1 up and down in conjunction with the vertical swing of the rear cover 16, and the working height of the rotary working unit 12 is automatically adjusted.

The transmission gearbox 4 has a drive shaft (P) integrated with an input shaft 5 receiving power from a PTO shaft of a tractor.
IC shaft) 24 and driven shaft (pinion shaft) 25
Are arranged side by side in the front-rear direction, and change gears 26, 28 are provided at the rear end sides of the two shafts 24, 25 so as to be insertable and replaceable by splines. The change gear 26 is retained by a retaining coupler 27 fixed via a boss to a cover 35 provided at the rear end of the gear box 4, and the outside of the change gear 28 is disposed on the cover 35 side via the boss. It is retained by a change gear 29 fixed by a detent pin 29a. These change gears 26, 2
8 and 29 can be inserted and replaced from both front and rear sides with respect to the shafts 24 and 25, respectively.

An idle shaft 30 is axially supported between the shafts 24 and 25 along the two shafts 24 and 25. The idle shaft 30 has a width greater than the gear width of the change gears 26 and 28 from the rear ends of the shafts 24 and 25. An idle gear 31 is fitted on the front side to mesh with the change gears 26 and 28, and the idle gear 3
Power is transmitted to the driven shaft 25 via the drive shaft 1, and the pinion 32 fixed to the driven shaft 25 meshes with a bevel gear 34 fixed to an end of the transmission shaft 33 to rotate the transmission shaft 33. In the state of FIGS. 1 to 5,
When the PTO shaft of the tractor rotates forward and power is transmitted to the drive shaft 24, the idle gear 31 meshes with the change gears 26 and 28, so that the idle gear 3
Power is transmitted to the driven shaft 25 via the rotary shaft 1 to rotate the rotary working unit 12 forward at a high speed to perform mowing work.

As shown in FIGS. 6 and 7, the change gears 26 and 28 in FIGS. 3 to 5 are removed from the shafts 24 and 25, the change gear 29 is removed from the cover 35, and the change gear 28 is attached to the shaft 24. A change gear 29 is fitted on the shaft 25 with the bosses of the gears facing forward, and the change gears 28 and 29 are directly meshed with each other so as not to mesh with the idle gear 31. Thus, the power is transmitted from the drive shaft 24 to the driven shaft 25 at a reduced speed. Then, the PTO shaft of the tractor rotates forward and the drive shaft 2
4, when the power is transmitted to the rotary work unit 4, the rotary work unit 12 is rotated at a low speed to perform the tilling work.

The cover 35 supports the stopper coupler 27 and a spare change gear, and functions to prevent the change gear fitted on the shafts 24 and 25 from coming off. The side is stopped by a set screw 35a, the other end is locked by a hook arm 36, and is engaged and disengaged by a cam lever 37 which is rotated by a shaft 38, so that the cover 35 is opened and closed. Therefore, the cover 35
The change gear and idle gear can be inserted and replaced while the cover is open, and the cover 35 can be easily opened and closed.

Here, the number of teeth of each gear is the change gear 26.
27 gears, 18 change gears, 2 change gears
9, 9 idle gears 31, 20 pinions 32
Are 15 sheets and the bevel gear 34 is 20 sheets. In the case of FIGS. 3 to 5, the rotary working unit 12 is
The mowing operation is performed by rotating the motor forward at a high speed of 0 rpm. In the case of FIGS. 6 and 7, the rotary working unit 12 is
The tilling work is performed by reverse rotation at a low speed of 06 rpm.

FIG. 8 is a plan view (a) showing the inside of the transmission gear box 4 when the PTO shaft of the tractor rotates in the reverse direction to perform mowing work, and a side view (b) showing the meshing state of the change gears 39 and 40. Yes, change gear 39 to drive shaft 2
4, a change gear 40 is fitted into the driven shaft 25, and the change gear 40 is prevented from falling off by a stopper coupler 27a. The number of teeth of the change gear 39 is 36, and the number of teeth of the change gear 40 is 17. In this case,
The mowing work is performed by rotating the rotary working unit 12 forward at a high speed of 1102 rpm.

FIG. 9 is a plan view (a) showing the inside of the transmission gear box 4 when the PTO shaft of the tractor rotates in the reverse direction to perform the tilling operation, and a side view (b) showing the meshing state of the change gears 39 and 40. The change gear 40 is connected to the drive shaft 24
Then, the change gear 39 is fitted and inserted into the driven shaft 25, respectively.
The change gear 39 is retained by a retaining coupler 27a. In this case, the rotary working unit 12 is
The tilling work is performed by rotating the rotor forward at a low speed of 6 rpm.

FIGS. 10 to 13 show another embodiment of the present invention. The idle shaft 30 in which the idle gear 41 having 29 teeth is inserted is located at a position where the outer peripheries of the change gears 26 and 28 do not interfere. The idle gear 41 is inserted and meshed with the change gears 26 and 28 when the rotary work unit 12 is rotated forward, and the idle gear 41 is removed when the rotary work unit 12 is rotated reversely. 26 and 28 are meshed. FIG. 10 shows the change gears 26 and 2 during the mowing operation when the PTO shaft of the tractor rotates forward.
8A and 8B are a plan view and a side view showing a meshing state between the idle working gear 8 and the idle gear 41;
Performs forward mowing at a high speed of 1090 rpm to perform mowing work.
FIG. 11 is a plan view (a) and a side view (b) showing the engagement state of the change gears 28 and 29 at the time of tilling work with the PTO shaft of the tractor rotating forward, and the rotary working unit 12 is shown.
Performs tilling work by reversing at a low speed of 206 rpm.

FIG. 12 is a plan view (a) and a side view (b) showing the engagement state of the change gears 39 and 40 during the mowing work when the PTO shaft of the tractor is reversed, and the rotary working unit 12 has a high speed of 1102 rpm. Rotate forward to cut grass. FIG. 13 is a plan view (a) and a side view (b) showing the engagement state of the change gears 39 and 40 during the tilling operation when the PTO shaft of the tractor is reversed, and the rotary working unit 1 is shown.
2 performs the tilling work by reversing at a low speed of 206 rpm.

[0021]

As described above, according to the transmission for an agricultural work machine of the present invention, a drive shaft receiving power from a PTO shaft of a tractor and a driven shaft are arranged side by side in the front-rear direction on the transmission gear box. At the rear ends of these two shafts, change gears are provided so that they can be inserted and replaced, an idle shaft is provided at a position that does not interfere with the outer circumferences of the two change gears, and power is transmitted from the drive shaft to the driven shaft via the idle gear, or The change gears are replaced and the two change gears are directly meshed to transmit power from the drive shaft to the driven shaft.
Attached to a tractor with a different rotation speed of the O-axis or a tractor with a reversible PTO shaft,
Switching of reverse rotation and switching of the number of rotations can be easily performed. In addition, the transmission gearbox only requires more idle gears and change gears than conventional gearboxes, can be configured compactly, has a small increase in weight, has a good matching balance with the body, and can be manufactured at low cost. Further, it is possible to easily select a rotation speed suitable for mowing work and tilling work.

[Brief description of the drawings]

FIG. 1 is an overall side view of a tilling / mowing machine according to the present invention.

FIG. 2 is a rear view of the same.

FIGS. 3A and 3B are an internal plan view of the speed change gear box when the PTO shaft rotates forward and mowing work, and a side view showing the state of engagement between the change gear and the idle gear;

FIG. 4 is a side sectional view of the speed change gearbox when the PTO shaft is rotating forward and mowing is performed.

FIG. 5 is a sectional view taken along line AA of FIG. 3 (b).

FIGS. 6A and 6B are a partial plan view of the inside of the speed change gear box during a tilling operation with the PTO shaft rotating forward, and a side view showing the meshing state of the change gears.

FIG. 7 is a side sectional view of the speed change gear box during a tilling operation with the PTO shaft rotating forward.

FIG. 8 is a plan view (a) of the internal portion of the speed change gear box during mowing work with the PTO shaft rotated in the reverse direction, and a side view (b) showing the engagement state of the change gear.

FIG. 9 is a plan view (a) showing the internal portion of the speed change gear box during a tilling operation when the PTO shaft is rotated in reverse, and a side view (b) showing the engagement state of change gears having different gear ratios.

FIG. 10 is a plan view (a) and a side view (b) showing a meshing state of a change gear and an idle gear during mowing work with a PTO shaft rotating forward in another embodiment of the present invention.

FIG. 11 is a plan view (a) and a side view (b) showing the meshing state of the change gears during the tilling operation with the PTO shaft rotating forward.

FIG. 12 is a plan view (a) and a side view (b) showing the meshing state of the change gears during mowing work when the PTO shaft is reversed.
It is.

FIG. 13 is a plan view (a) and a side view (b) showing the engagement state of the change gears during the tilling operation when the PTO shaft is reversed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tilling and mowing machine 2 Lower link connection part 3 Transmission part 4 Transmission gear box 5 Input shaft 6 Transmission frame 7 Support frame 8 Chain transmission case 9 Side frame 10 Rotary shaft 11 Tilling and mowing blade 12 Rotary working part 13 Shield cover 14 Side Unit cover 15 Front cover 16 Rear cover 17 Gauge wheel 18 Connecting rod 18a Connecting hole 19 Sensor arm 20 Bell crank 21 Support frame 22 Shaft 23 Hydraulic mechanism connecting rod 24 Drive shaft (PIC shaft) 25 Follower shaft (Pinion shaft) 26, 28 , 29,39,40 Change gear 29a
Non-rotating pins 27, 27a Retaining coupler 30 Idle shaft 31, 41 Idle gear 32 Pinion 33 Transmission shaft 34 Bevel gear 35 Transmission gear box cover 35a Set screw 36 Hook arm 37 Cam lever 38 Shaft

Claims (1)

[Claims] 1. A tractor is mounted on a rear part of a tractor via a three-point link hitch mechanism so as to be able to move up and down. In a farm work machine that performs a tilling operation or a mowing operation by rotating a rotary working unit equipped with a cutting blade in forward and reverse directions, the transmission gear box includes a drive shaft and a driven shaft that receive power from a PTO shaft of a tractor. And a change gear is provided at the rear end side of these two shafts so that they can be inserted and replaced. An idle shaft is provided at a position that does not interfere with the outer circumferences of the two change gears, and a driven shaft is provided from the drive shaft via the idle gear. Power transmission from the drive shaft to the driven shaft by transmitting power to the driven shaft or by changing gears and directly meshing the two change gears. Apparatus.