JP2015188437A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a step type speed changer for a threshing feed chain, which has a simple structure and can be executed at an inexpensive price.SOLUTION: A high-speed side speed change belt (22) and a low-speed side speed change belt (23), which can change the speeds at high-speed and low-speed stage, are wound between a power transmission shaft to a threshing part (4) and a drive shaft (14) for driving a threshing feed chain (13), and tension clutches (24 and 25) mounted on those high- and low-speed side speed change belts (22, 23) are applied or not in accordance with the vehicle speed, so that the threshing feed chain can be speed-changed at the high and low stages.

Description

  The present invention relates to a combiner that takes over and transports cereal grains after cutting to a threshing section, and more particularly to a transmission for a threshing feed chain.

  Conventionally, for example, as shown in Patent Document 1, a threshing feed chain of a combine threshing unit is rotationally driven via a stepped transmission having a two-speed range of high speed and low speed. It has been known.

JP 2008-86243 A

  Since the conventional speed change mechanism is a gear speed change mechanism, there is a problem that the structure is complicated and the cost is significantly increased.

The present invention aims to solve the above-described problems, and has taken the following technical means.
That is, the present invention according to claim 1 is a high-speed capable of two-stage shift between the power transmission shaft to the threshing section (4) and the drive shaft (14) for driving the threshing feed chain (13). The side transmission belt (22) and the low speed transmission belt (23) are wound and provided, and the tension clutches (24) and (25) provided on the high and low transmission belts (22) and (23) are turned on and off according to the vehicle speed. The threshing feed chain can be shifted in two steps of high and low.

  The threshing feed chain (13) is switched to the high speed side shift range by the high speed side belt (22) being engaged with the high speed side tension clutch (24) in the process of shifting the vehicle speed steplessly to the high speed travel side of the HST. Rotated at high speed.

  In the shifting process of the HST to the low speed traveling side, the low speed side transmission belt (23) is switched to the low speed side transmission range by the engagement operation of the low speed side tension clutch (25), and the threshing feed chain rotates at a low speed.

  According to a second aspect of the present invention, in the first aspect, the high speed side transmission belt (22) is configured to be turned on and off by a tension clutch (24), and the low speed side transmission belt (23) is a tension clutch (25). The low-speed drive pulley (27) is provided with a cam clutch (31).

  When the vehicle speed is low, the low-speed transmission belt (23) that is always in tension is rotated, and the threshing feed chain (13) is driven via the low-speed drive pulley (27) to rotate at low speed. When the vehicle speed becomes higher than a certain level, the high-speed tension clutch (24) is operated, and the threshing feed chain (13) rotates at a high speed by the rotation of the high-speed transmission belt (22).

  In short, according to the first aspect of the present invention, when shifting the threshing feed chain according to the vehicle speed, the shift is performed by the two-level shift belt, and therefore the configuration is compared with the conventional gear transmission mechanism. It is extremely simple and can be implemented at low cost.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the low speed side transmission belt is configured to be constantly tensioned, and the speed can be changed by turning on and off the tension clutch of only the high speed side transmission belt. The time lag caused by the tension clutch “ON / OFF” can be eliminated.

Combine side view Side sectional view of the main part of the threshing part Rear view of essential parts of stepped belt transmission Feed chain rotation speed state diagram during normal operation and handling Rear view showing braking stop mechanism of threshing feed chain Side view of the main part Side sectional view of the main part Side view of the main part of threshing feed chain

An embodiment of the present invention will be described with reference to the drawings.
The combine is mainly composed of a cutting part 3 at the front part of the vehicle body 1 provided with a traveling crawler 2 that cuts and conveys napped cereal rice cake, and a threshing part 4 at the rear part of the vehicle body that threshs the corn meal conveyed and supplied from the cutting part 3 Become. On the right side of the mowing unit, there are operation control units such as an operation box and a driver's seat 5, and behind that, a Glen tank 6 for temporarily storing the threshed grain is mounted, and the grain in the tank is removed from the machine. When it is taken out, it is discharged by a discharge auger 7 that can be moved up and down and turned left and right.

  The mowing unit 3 is a hair clipper-type cutting blade that divides the raised cereals to the left and right, the pulling device 9 that raises the cereals after weeding, and the reaper that cuts the raised cereals. The apparatus 10 includes a harvested corn straw transporting device 11 that transports the harvested culm to the rear threshing unit 4. Then, the cereal that has been transported to the end of the transport device 11 is inherited in a proper posture by the threshing feed chain 13 of the threshing unit 4.

The threshing feed chain 13 is stretched along a handle on one side of the handling chamber on which the handling cylinder 12 can be pivoted.
Rotational power from the engine E (disposed below the driver's seat 5) is transmitted to the traveling mission device M via the HST (hydraulic continuously variable transmission) to drive the traveling crawler 2. ing. Note that the traveling speed of the HST is continuously variable by operating the shift lever 15.

  The mowing unit 3 is transmitted to the mowing input shaft to the mowing unit 3 through the mowing clutch via the intermediate transmission gearbox, and the power is transmitted to the threshing unit 4 through the threshing clutch. ing. These cutting and threshing clutches are turned on and off by a cutting / clipping clutch lever 16. In a state where the threshing clutch is engaged, sorting devices such as the barrel 12, the threshing feed chain 13, the tang 18, the first transfer spiral 19, the dust exhaust fan 20, and the like are driven.

  The threshing feed chain 13 is equipped with a stepped belt transmission 21 capable of shifting in two steps of high and low so that rotational power shifted at high and low speeds is transmitted through the drive shaft 14. It has become.

  A belt transmission 21 that changes the rotational speed of the threshing feed chain 13 includes a high-speed side transmission belt 22 and a low-speed side transmission belt 23, and enables two-level shifts by switching the tension clutches 24 and 25. The high speed side transmission belt 22 is installed on the drive shaft 14 of the threshing feed chain, and spans between the high speed side drive pulley 26 and the cowl shaft pulley 28 of the threshing section, and the low speed side transmission belt 23 is installed on the drive shaft 14. Between the low-speed drive pulley 27 and the first helical pulley 29 that drives the first transfer spiral 19.

  In the illustrated example, the high speed side transmission belt 22 is configured to be turned on and off via the clutch motor 30 by the tension clutch 24, the low speed side transmission belt 23 is configured to be constantly tensioned by the tension clutch 25, and A cam clutch 31 is provided on the low-speed drive pulley 27 of the low-speed transmission belt 23.

  Next, the shift control of the threshing feed chain 13 will be described. The threshing feed chain 13 is switched to the high speed shift region by the high speed side transmission belt 22 in the process of shifting the vehicle speed steplessly to the high speed traveling side of the HST. In the shifting process toward the low speed traveling side, the low speed side shifting belt 23 can switch to the low speed shifting range. In other words, the threshing feed chain 13 is automatically step-shifted to the high speed side and the low speed side according to the vehicle speed.

  In addition, at the time of handling work at the headland, for example, as shown in FIG. 4, when switching to the handling mode, the rotational speed of the threshing feed chain 13 is switched from the high speed side to the low speed side during normal work. If constituted in this way, in an emergency, the threshing feed chain can be stopped quickly and it is safe.

  In the configuration in which the rotation speed of the red pepper is changed by the Belcon drive, the threshing feed chain is driven by belt transmission from the hot spring shaft, and when the vehicle speed is low and stopped, the speed of the threshing feed chain is lowered at the same time as the low speed In addition, by configuring so as to be slower, the threshing feed chain can be shifted using the tang-corn bellcon, and can be implemented at low cost. Moreover, since the speed of the feed chain decreases when the vehicle speed is low and the vehicle stops, it is safe when handling. In such a configuration, if a hand-operated mode switch is provided near the driver's seat and the operation mode is switched to the hand-operated mode by operating this switch, the vehicle speed will be low if the carrot rotation is set to the minimum rotation. In addition, the speed of the feed chain is slowed at the time of stoppage and at the minimum rotation at the time of handling, it is safe when handling.

As another configuration of the handling mode switch, when the parking brake pedal is depressed by the threshing clutch “ON”, the rotation of the red pepper can be configured to be the minimum rotation.
In the drive configuration of the threshing feed chain, there are two systems: a transmission system through the dust removal gear case and a front transmission system that is transmitted by the belt clutch from the threshing counter unit. Use low-speed transmission. At the time of work, the low speed transmission is in a state where the clutch is disengaged, and the threshing feed chain is rotated at high speed by the transmission from the dust gear case side. At the time of handling, the threshing feed chain can be rotated at a low speed by disengaging the clutch on the dust removal gear case side and turning on the front transmission system. The above-mentioned clutch uses a belt tension clutch and is configured to be turned on and off by a motor. When the emergency stop button is pressed during handling, the belt tension clutch is turned off. Therefore, it can be stopped immediately and is safe.

  In the configuration in which the threshing feed chain is driven by a motor, the space can be effectively used by installing the motor below the threshing portion inlet funnel. Further, the speed of the threshing feed chain is changed in conjunction with the vehicle speed, and when the handling mode switch is operated, it can be operated at a constant low speed regardless of the vehicle speed.

  In a configuration in which the threshing feed chain is driven by a motor, a sensor is provided on the feed chain clamping rail to detect the culm layer thickness during threshing and change the feed chain speed so that the culm layer thickness is constant. By doing so, the thickness of the culm layer at the time of threshing can always be made constant, and untreated residue can be prevented.

  In the embodiment shown in FIGS. 5 to 7, when the emergency stop switch button 34 having the stopper 33 is pushed from the outside of the chain cover 35, the engine E is stopped and the switch button 34 is rotated by the action of the torque spring 36. The stopper 33 presses the feed chain 13 and stops the inertial rotation by braking. The stopper projection 37 does not return to the original position unless it is aligned with the concave groove 38.

  As an emergency stop means for the engine, there is provided a sensor that senses when the chain cover 35, the belt cover below it or the dust cover of the cutting part itself is pressed, and the engine automatically stops when this sensor reacts. It may be taken.

  In addition, as shown in FIG. 8, in the configuration in which the drive unit (drive sprocket) 39 is provided on the terminal side of the threshing feed chain 13, the terminal unit of the feed chain guide rail 40 is driven when the emergency stop switch is operated. It can also be configured to move to the sprocket 39 side and lift the chain from the sprocket to cut off the drive, and the feed chain can be quickly stopped in an emergency. Note that the drive sprocket can be moved to stop the edge with the feed chain.

4 Threshing section 13 Threshing feed chain 14 Drive shaft 22 High speed side transmission belt 23 Low speed side transmission belt 24 High speed side tension clutch 25 Low speed side tension clutch 26 High speed side drive pulley 27 Low speed side drive pulley 31 Cam clutch

Claims (2)

  A high-speed side transmission belt (22) and a low-speed side transmission belt capable of shifting in two steps, high and low, between a power transmission shaft to the threshing section (4) and a drive shaft (14) that drives the threshing feed chain (13) (23) is provided by winding, and the tension clutches (24, 25) provided on these high and low speed change belts (22, 23) are turned on and off according to the vehicle speed so that the threshing feed chain can be shifted in two steps. Combine that is characterized by that.   The high speed side transmission belt (22) is configured to be turned on and off by a tension clutch (24), and the low speed side transmission belt (23) is configured to be constantly tensioned by a tension clutch (25), and the low speed side drive pulley. The combine according to claim 1, characterized in that a cam clutch (31) is provided on (27).

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