JPH10117561A - Driving power transmission device for combine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the driving power transmission device of a combine capable of effectively transmitting output from a hydraulic static transmission(HST) for driving power to a cutting device without the need of providing a large space even in a middle-sized or small-sized combine. SOLUTION: By freely rotatably and loosely fitting a loose pulley 20 other than fixing an HST input pulley 16 on an HST input shaft 15, spreading a V belt 19 to the loose pulley 20 and guiding it, the cutting device 7 is driven at a speed proportional to the traveling speed of the combine and the belt 19 wound to an HST output pulley 18 for the cutting device and a cutting device input pulley 26 does not cause interference with the input shaft of the HST 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission for a combine having a hydrostatic continuously variable transmission.

[0002]

2. Description of the Related Art A combine is equipped with an engine as a power source, and the power generated by the engine is used for running, cutting, and threshing of the combine. It is necessary to keep the engine speed constant at all times in order to maintain the threshing capacity, and the running speed must be greatly changed depending on the field conditions, crop types, working conditions, etc. Although the speed change means is provided, since the gear speed change means is stepwise and the operation is troublesome, the gear change means can be steplessly changed as a speed change means between the engine and the traveling means by one operation of the shift lever. It has become common to provide a hydrostatic transmission (hereinafter referred to as HST) that is easy to operate.

[0003] The HST often integrates a combination of a variable displacement axial plunger pump and a fixed displacement axial plunger motor. Even when the variable displacement axial plunger pump is driven by an engine having a constant rotation speed, the HST discharges from the pump. By controlling the change of the inclination angle of the swash plate for changing the amount, the discharge amount of the pump can be controlled in a stepless manner between zero and ± 100%. The fixed displacement axial plunger motor, which connects the hydraulic fluid circuit in series to the variable displacement axial plunger pump, rotates at a rotational speed proportional to the discharge amount of the variable displacement axial plunger pump, so that the discharge amount of the variable displacement axial plunger pump is reduced. When a change from zero to plus or minus 100% occurs, the rotation speed of the fixed displacement axial plunger motor changes from zero to plus or minus 100%.

Since a traveling device is connected to the output shaft of the fixed displacement axial plunger motor via a transmission such as a gear train, the inclination of the swash plate of the variable displacement axial plunger pump is controlled by changing the transmission lever. The discharge speed of the variable displacement axial plunger pump is steplessly controlled between zero and ± 100% to stop the traveling speed of the combine from forward (zero) to forward 100
% And 100% reverse movement, stepless speed change control can be performed.

Since the drive speed of the combine harvesting means must follow the traveling speed of the combine, the driving force of the harvesting means when steplessly changing the speed in the HST is the output shaft of the HST, that is, the output of the fixed displacement axial plunger motor. Removed from the shaft.

[0006]

An HST capable of continuously changing the traveling speed of a combine by operating a single shift lever,
Since the driving operation is easy, it is often used as a speed change means between the engine and the traveling means, and at first it was used for large combines, but it is gradually used for medium and small combines. The following problems to be solved have arisen in the power transmission means from the output shaft of the HST, that is, the output shaft of the fixed displacement axial plunger motor to the cutting means input shaft.

In a large combine, there is a considerably large space around the output shaft of the HST, so that the power transmission means from the output shaft of the HST to the input shaft of the mowing means can be arranged relatively freely. HST in combine
The space around the output shaft of the large combine is considerably narrower than the space around the output shaft of the HST, and it is difficult to dispose the power transmission means from the output shaft of the HST to the input shaft of the reaper, or the output of the HST. It is necessary to provide a large space around the power transmission means from the shaft to the reaping means input shaft, and a problem has arisen that a medium-sized and small-sized combine becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combine power transmission device capable of effectively transmitting the power from the HST to the reaping means without providing a large space for the output from the HST even in a small or medium-sized combine. is there.

[0009]

The above object of the present invention is attained by the following constitution. That is, in a combine having a mowing means driven by power from an engine, threshing means, and running means for running the power from the engine at a continuously variable speed by a hydrostatic transmission, a belt driving the mowing means is connected to the hydrostatic transmission. The output pulley fixed to the output shaft is wound around the cutting means input pulley fixed to the input shaft of the cutting means through a loose pulley rotatably loosely fitted to the input shaft of the hydrostatic transmission, and is proportional to the traveling speed of the traveling means. A power transmission device of a combine for driving the reaping means at a changing speed.

According to the present invention, the HST input shaft
In addition to fixing the input pulley, the loose pulley is rotatably loosely fitted, and an endless belt such as a V belt is stretched and guided on the loose pulley to drive the cutting means at a speed proportional to the traveling speed of the combine, HST for cutting means
The belt wound around the output pulley and the cutting means input pulley does not cause interference with the input shaft of the hydrostatic transmission HST.

A charge pump and a working machine pump are installed in connection with the end of the input shaft of the HST and are driven to rotate together with the input shaft, so that the charge pump and the working machine pump are proportional to the number of revolutions of the engine which rotates at a constant speed. , And a charge pump and a working machine pump are arranged in a space surrounded by the upper part of the HST and the power transmission column of the reaping means, so that a small and medium-sized combiner can be downsized.

[0012]

Embodiments of the present invention will be described with reference to the drawings. The combine of the present embodiment is shown in FIGS. FIG. 1 is a side view of the combine, FIG. 2 is a schematic side view showing a reaper 7 and a feeding and conveying device 42 and the like inside the combine, FIG. 3 is a top view of the combine, and FIG. It is a top view centering on the culm part.

In front of the body frame 4 having the driver's seat 2 and the traveling device 5, a reaper 7 and a supply / transport device 42 are provided. The cutting device 7 includes a weeding tool 43 for weeding the planted grain culm, a raising case 45 for causing the planted grain culm,
It comprises a cutting blade 46 for cutting the planted grain culm and a stock transfer device 47 for holding the grain culm cut by the cutting blade 46 and conveying it backward. Behind the stock carrier 47,
A supply transport device 42 is provided for taking over and transporting the grain culm transported from the stock transport device 47.

The reaper 7 is supported at a substantially right and left intermediate portion by a reaper support frame 49 which moves up and down about a fulcrum above the traveling device 5, so that the reaper 7 is supported by the reaper. It is configured to move up and down together with the frame 49.

Above the machine frame 4, a threshing device 51 having a feed chain 50 for taking over and transporting the cereal culm conveyed from the supply / conveyance device 42, and a grain that has been threshed and selected by the threshing device 51, A grain tank 9 for temporarily storing is placed. Behind the threshing device 51, there is provided a cutter 54 for cutting the culm conveyed from the culm chain 53. Further, other working machines other than the cutter 54, such as a knotter for binding the culm, may be mounted.

A vertical auger 8a is erected at the rear of the grain tank 9 so as to be vertically movable, and connected to the upper end of the vertical auger 8a, a discharge auger 8b having a length substantially equal to the length in the front-rear direction of the machine body. The grains stored in the grain tank 9 are rotatably provided in the left-right direction, and are discharged from the discharge auger 8b to the outside.

FIG. 4 shows a plan view of the culm device.
The handling room, which is the main threshing unit of the threshing device 51, is provided with a handling drum rotating drum 29 in the handling room space, and a large number of saw teeth 30a are planted on the handling drum rotating drum 30. As shown in FIG. 4, the feed rod 50 accepts a grain rod with grains transported in the direction of arrow A at the entrance of the handling room space 27, and the saw teeth 30 a of the handling drum rotating drum 30 rotating in the handling room space 27.
And threshing due to the sawing action of the feed chain 50 and relative movement with the grain rod transported in the direction of arrow A in FIG.

As shown in FIG. 4, a grain rod which is advanced in the handling room space 27 in the direction of arrow A in FIG. Arrow A1
Then, it is gripped and transported by the straw chain 69 and the straw tip chain 70, thrown into the straw cutters 72 and 73, cut, and discharged to the field.

In the handling room space 27, the short grain, such as straw, is thrown in the direction of the arrow A2. After entering the processing chamber space 29, the dust processing chamber space 29 is implanted in the dust processing drum 32 which advances in the direction of arrow K and rotates integrally with the second processing drum 31 in the dust processing chamber space 29. The second kernel, which has been cut by the large number of saw teeth 32a and remains, is passed through a net in a dust treatment chamber (not shown) and dropped on a rocking shelf.

The handling room space 27, the second processing room space 28, and the dust processing room space 29 communicate with a cross flow fan 71 provided at the rear of the threshing device 51. When the cross flow fan 71 is rotated, the handling room space is turned on. 27, air containing straw chips, branch stalks and dust in the second processing chamber space 28 and the dust processing chamber space 29 is sucked and discharged to the outside of the combine 1.

As shown in FIG. 5, the power transmission portion of the combine 1 is fixed to the output shaft 11 of the engine 10 and one end of an endless V-belt 13 is wound around an engine output pulley 12 which rotates together with the output shaft 11. The other end of the belt 13 is wound around an HST input pulley 16 fixed to an input shaft 15 of a hydrostatic transmission (HST) 100, and the tension pulley 14 is used to adjust the slack of the V-belt 13, and FIG. HST of a partial sectional view taken along the line CC of FIG.
From the output shaft 17 to the traveling gear train 30, the swing clutch 4
0, the crawler drive shafts 41a, 41b are rotated, and the left and right crawlers 5a, 5b are rotated by sprocket wheels 6a, 6b fixed to the crawler drive shafts 41a, 41b, respectively.
5b is pulled to run and turn the combine 1 (see FIG. 1).

The HST 100 uses a hydraulic circuit shown in FIG. 9 and uses a swash plate type variable displacement axial plunger pump 11.
By changing the flow rate and discharge direction by 0, the rotational direction and speed of the variable displacement axial motor 110 are changed by discharging the pressure oil.

Since the driving speed of the harvester 7 of the combine 1 needs to follow the traveling speed of the combine 1,
The driving force of the reaper 7 when the continuously variable transmission is performed in ST100 is taken out from the output shaft 17a of the HST 100,
7a, the HST output pulley 18 for the reaper is rotated, and one end of the V belt 19 is wound around the HST output pulley 18 for the reaper.
The other end of the V-belt 19 is wound around a reaper input pulley 26 fixed to a reaper power transmission shaft 25 built in (FIG. 6) to drive the reaper 7.

In the present invention, the reaper power transmission shaft 25 for transmitting the power of the reaper 7 combines the reaper power transmission column 22 with the combine 1 so that the power can be transmitted even when the reaper 7 swings up and down. And the direction of the column 22 is set in parallel with the HST output shaft 17a, and the column 22 is supported by the bearings 24 and 24 so as to be freely rotatable. The power transmission shaft 25 is turned around and the power transmission shaft 25 can be transmitted by the V-belt 19 without changing the center-to-center distance between the power transmission shaft 25 and the HST output shaft 17a. The power transmitted to the power transmission shaft 25 is transmitted to the reaper 7 via a power transmission shaft (not shown) inside the reaper power transmission vertical column 23 which is rigidly connected to the reaper power transmission column 22 in a T-shape.

The HST 100 has an input shaft 15 and an output shaft 17.
Are substantially vertical, and the input shaft 15 is arranged on the upper side and the output shaft 17 is arranged on the lower side in relation to the output to the traveling device. The mower power transmission shaft 25 is connected to the column 22 as described above.
Must be located at the upper front of the combine 1.
The position of the mowing device power transmission shaft 25 has to be almost directly above the HST 100. For this reason, V wound around the HST output pulley 18 for the reaper and the input pulley 26 for the reaper.
Since the belt 19 interferes with the input shaft 15 of the HST 100 and cannot transmit power to the reaper 7, as a result of intensive studies, in addition to the HST input pulley 16 fixed on the input shaft 15, a loose pulley is mounted on the input shaft 15. 7 and 8, a V-belt 19 is stretched and guided on the loose pulley 20, and the input shaft 15 is
The power of the output of the HST 100 can be transmitted to the reaper 7 while avoiding interference with the belt 19.

FIGS. 7 and 8 are side views of a first embodiment and a second embodiment, respectively, showing a schematic diagram of a power transmission unit for transmitting the output of the HST 100 to the reaper 7 for use in the reaper. The V belt 19 wound around the HST output pulley 18 and the reaper input pulley 26 and given an appropriate tension by the tension pulley 21
This shows that power can be transmitted from the HST 100 to the reaper 7 without causing interference with the input shaft 15 of 0 and the HST input pulley 16.

Further, in the present invention, as shown in FIG.
The input pulley 16 of the ST input shaft 15 is fixed and the shaft end 1
5 is provided on the shaft end opposite to the shaft end on which the loose pulley 20 is loosely fitted, such as a trochoid pump or the like, for driving a hydraulic pump for pumping the hydraulic fluid into the HST 100 and a hydraulic cylinder for raising and lowering the reaper 7 and for turning the clutch 40. Since the working machine pump 119 for supplying the working fluid for operating the shifter is connected to the engine, the charge pump 118 and the working machine pump 119 are connected to the rotating speed of the engine 10 which is always kept constant in order to maintain the threshing ability. In synchronization with the structure that can be maintained at a constant pump discharge amount by rotating at a constant rotation speed, the medium size by utilizing the space surrounded by the upper part of the HST 100 and the reaper power transmission columns 22 and 23, The structure was designed to reduce the size of the small combine.

The operation of the power transmission unit of the combine 1 according to the configuration of the present invention will be described. The engine 10 mounted on the body frame 4 of the combine 1 shown in FIGS. 1 and 5 is configured to be capable of running, cutting, threshing, and the like by operating the operation lever of the driver's seat 2. More specifically, the output of the output shaft 11 of the engine 10 is transmitted from the engine output pulley 12 to the HST input pulley 16 and the input shaft 15 of the hydrostatic transmission HST100 by the V-belt 13 whose slack is adjusted by the tension pulley 14.

When the HST lever (not shown) in the driver's seat 2 is tilted forward, the combine moves forward. At this time, the swash plate 114 connected to the HST lever is tilted, and the swash plate 114 is tilted according to the tilt amount of the HST lever. The inclination angle of the plate 114 also changes,
The amount of oil discharged to the constant displacement hydraulic motor 120 changes according to the amount of change in the inclination angle of the swash plate 114. As a result, the rotation speed of the output shaft 120a of the constant displacement hydraulic motor 120 changes, the rotation speed of the input shaft (not shown) of the traveling device 5 also changes, and the traveling speed changes. When the combine 1 is moved backward, the HST lever is tilted to the rear side, but the swash plate 114 is inclined to the opposite side from that at the time of forward movement.
Since the direction of oil discharge to the zero side is also reversed, the output shaft 120a
Rotates to the opposite side. Thus, the rotation of the input shaft of the traveling device 5 is reversed, and the traveling device 5 moves backward.

When the number of revolutions of the engine 10 is increased by adjusting fuel injection means (not shown) interlocked with the throttle lever, the variable hydraulic pump 110 is directly connected to the engine 10. Also rises. HST
When the lever is in the neutral position, the oil
Oil is not fed in the 20 direction, and therefore, the output shaft 120a does not rotate. When the HST lever is moved forward (or backward), the swash plate 114 is inclined via a link mechanism or the like. Note that a position sensor may be provided on the HST lever, a cylinder or a motor may be linked to the swash plate 114, and the swash plate 114 may be moved by an electric signal from the position sensor. When the swash plate 114 is inclined, oil is supplied to the constant displacement hydraulic motor 120 side. Then, the output shaft 120a rotates, and the input shaft of the traveling device 5 rotates. Thereafter, the speed is changed at an arbitrary speed ratio via the transmission unit 130, and the crawler drive shafts 41a and 41b (FIG. 6) rotate.

The mowing device 7 which needs to be driven at a driving speed that follows the traveling speed of the combine 1 is applied to the output shaft of the HST 100, that is, the H for the mowing device.
V taken out from the ST output shaft 17a (FIG. 6) and given an appropriate tension by the tension pulley 21 (FIG. 5).
From the HST output pulley 18 for the reaper via the belt 19, through the loose pulley 20, to the reaper input pulley 26
To drive the reaper 7 by rotating the input shaft 25.

In the first embodiment shown in FIG.
Although 0 is arranged inside the loop of the V-belt 19, and the loose pulley 20 is arranged outside the loop of the V-belt 19 in the second embodiment shown in FIG.

The HST input pulley 16 of the HST input shaft 15
In addition, the charge pump 118 and the work machine pump 119 (FIG. 9) connected to the shaft end opposite to the loose pulley 20 are synchronized with the rotational speed of the engine 10 which is always kept constant.
The hydraulic fluid is supplied to the HST 100 and the working fluid to the working machine while rotating at a constant rotational speed and always maintaining a constant pump discharge amount. Thus, according to the embodiment of the present invention,
A V-belt wound around an HST output pulley for the reaper and an input pulley for the reaper is used as a hydrostatic transmission HST.
Of the cutting means can be driven at a speed proportional to the arbitrarily changing traveling speed without causing interference with the input shaft of the vehicle, and unlike a large combine,
The power transmission means from the output shaft of the HST to the input shaft of the reaping means could be arranged relatively freely even in a medium or small combine having no large space around the ST. Enlargement can be avoided.

[Brief description of the drawings]

FIG. 1 is an external side view of a combine according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a mowing device, a supply and transport device, and the like inside the combine of FIG. 1;

FIG. 3 shows a top view of the combine of FIG.

FIG. 4 is a plan view of a main part of the combine threshing apparatus of FIG. 1;

FIG. 5 is a side view showing a power transmission unit of the combine shown in FIG. 1;

FIG. 6 is a front view showing a partial cross section taken along the line CC of FIG. 5;

FIG. 7 is a side view showing a power transmission unit showing one embodiment of the combine of the present invention.

FIG. 8 is a side view showing a power transmission unit according to another embodiment of the combine of the present invention.

FIG. 9 is a partially cutaway sectional view of the hydrostatic transmission of the combine according to the present invention.

[Description of Signs] 1 Combine 2 Driver's seat 4 Airframe 5 Running device 5a, 5b Left and right running crawlers 6 Sprocket wheels 6a, 6b Left and right sprocket wheels 7 Cutting device 8a Vertical auger 8b Discharge auger 9 Grain tank 10 Engine 11 Engine output shaft 12 Engine output pulley 13, 19 V belt 14 Tension pulley 15 Hydrostatic transmission HST input shaft 16 HST input pulley 17 HST output shaft 17a HST output shaft for cutting means 18 HST output pulley for cutting means 20 Loose pulley 21 Tension pulley REFERENCE SIGNS LIST 22 reaper power transmission column 23 reaper power transmission column 24 bearing 25 reaper power transmission shaft (input shaft) 26 reaper input pulley 27 handling room space 28 second processing room space 29 dust processing room space 30 Handling drum rotating drum 29a Serrated teeth 31 No. 2 processing drum 32 Dust processing drum 32a Serrated teeth 40 Rotating clutches 41a, 41b Left and right crawler drive shafts 42 Feeding and conveying device 43 Weeding tool 45 Raising case 46 Cutting blade 47 Stock transfer device 49 Cutting device support frame 50 Feed chain 51 Threshing device 53 Drainage culm chain 54 Drainage culm cutting cutter 69 Drainage chain 70 Drainage spike chain 72, 73 Straw cutter 71 Cross-flow fan 100 Hydrostatic transmission HST 101 HST Case 110 Swash plate type variable displacement axial plunger pump 114 Swash plate 118 Charge pump 119 Work machine pump 120 Swash plate fixed displacement axial plunger motor

Claims (1)

[Claims] 1. A combine having a cutting means driven by power from an engine, a threshing means, and a running means for running the power from the engine at a continuously variable speed by a hydrostatic transmission, wherein a belt for driving the cutting means is statically driven. The traveling means travels from the output pulley fixed to the output shaft of the hydraulic transmission through a loose pulley rotatably loosely fitted to the input shaft of the hydrostatic transmission and around the cutting means input pulley fixed to the input shaft of the cutting means. A power transmission device for a combine, wherein the mowing means is driven at a speed proportional to the speed.