JPH05256347A - Speed change gear for combined harvester and thresher - Google Patents

Abstract

PURPOSE:To enable the setting of a wide speed-change region by combining the high/low changeover of a hydraulic motor and the high/low changeover of an auxiliary speed-change mechanism for selecting a speed-change region. CONSTITUTION:The upper end of a main speed-change lever 28 is provided with a grip 30 for manual operation, and thereto a changeover switch 31 for changing over the vehicle speed is provided. The vehicle-speed modes to be changed over are set so as to be a low-speed mode when an auxiliary speed- change mechanism 4 is changed over to low and also a hydraulic motor 2 is changed over to low, a normal-speed mode when the auxiliary speed-change mechanism 4 is low and the hydraulic motor 2 is high, a high-speed mode when the auxiliary speed-change mechanism 4 is high and the hydraulic motor 2 low, and a traveling speed mode when the auxiliary speed-change mechanism 4 is high and the hydraulic motor 2 high, so that the four kinds of speed-change regions can be properly selected simply and easily by one-touch selective changeover so as to meet the working conditions varying with complicated changing speeds. Thus, the working performance can be secured, and the troublesome selection of a worker can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine transmission, and can be used in a traveling transmission and the like in which a hydraulic continuously variable transmission and a gear stepped transmission are combined.

[0002]

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION Depending on how the traveling speed is selected during combine operation,
Its work performance, that is, efficiency and accuracy, may be affected. Therefore, conventionally, various improvements have been made to the traveling transmission. Currently, in a large and highly efficient combine, a traveling transmission is disclosed in which a hydraulic type continuously variable transmission including a pump and a motor and a gear type stepped transmission including a sub transmission mechanism are interlockingly connected.

These traveling transmissions are formed by a combination of high and low continuously variable transmissions on the pump side of a hydraulic continuously variable transmission, and high and low two-speed transmissions of an auxiliary transmission mechanism of a gear stepped transmission. Although the continuously variable transmission area is wide, a high torque may be required in the combine work in which the work conditions change variously, and it is difficult to obtain the transmission selection under such special conditions. Performance during work tends to be impaired.

Therefore, the present invention is intended to provide a traveling transmission device capable of selectively switching a shift region so as to cope with such a special condition requiring a high torque.

[0005]

According to the present invention, a hydraulic stepless transmission 3 in which a hydraulic pump 1 and a hydraulic motor 2 capable of two-step shifting are connected to a gear stepped transmission 5 having a sub transmission mechanism 4 incorporated therein. In a combine traveling transmission that shifts gears in conjunction with each other, a combine shift capable of selecting a shift range combining a high / low switching of the hydraulic motor 2 and a high / low switching of the auxiliary transmission mechanism 4 The configuration of the device.

[0006]

With the above-described structure, in the shift change of the traveling transmission in the combine work, the optimum shift range by the hydraulic motor 2 and the auxiliary transmission mechanism 4 is selectively changed by an appropriate means at the operator's hand. Then, in each of these gear shift regions, the gear shift is continuously performed by operating the hydraulic pump 1. Each of these shift regions is shown in FIG.
As shown in, the auxiliary transmission mechanism 4 of the gear stepped transmission 5 is set to "low" and the hydraulic motor 2 of the hydraulic continuously variable transmission 3 is set to "high".
The normal speed mode for rice harvesting is switched to the normal speed mode, and the low speed mode (bad condition) for rice harvesting is switched when the hydraulic motor 2 is switched to "low" while the subtransmission mechanism 4 remains "low". Further, when the subtransmission mechanism 4 is switched to "high" and the hydraulic motor 2 is switched to "low", a high speed mode for wheat cutting is set, and the subtransmission mechanism 4 remains "high" and the hydraulic motor 2 is switched to "high". It is possible to set a large number of shift regions in such a state that the mode becomes the traveling speed mode when switched to "high".

[0007] As described above, in the traveling transmission in which the hydraulic continuously variable transmission 3 and the geared stepped transmission 5 are combined, among the combinations of a large number of transmission regions, depending on the working condition at that time, For example, in mowing under bad conditions such as lodging grain culms and wet fields, as shown in FIG. 2, sufficient torque is available even in the "low-speed mode" shift range where high torque output is achieved at extremely low speed, and high-speed mowing such as wheat mowing. In order to enable easy and easy selection and switching of the "high speed mode" speed change range and the like that can be achieved, it is possible to set an unprecedented wide speed change range that can be adapted to various working conditions.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a combine traveling device 6. This traveling device 6 includes a traveling output shaft 7 extending from the output side of a gear stepped transmission 5 for shifting the vehicle speed stepwise by gears to the left and right, Auxiliary transmission mechanism 4 for interlocking with a pair of left and right traveling crawlers 8 traveling on a surface and for switching the vehicle speed between high and low by the gear stepped transmission 5.
Built in. Further, an output side of the hydraulic motor 2 of the hydraulic continuously variable transmission 3 that continuously changes the vehicle speed by hydraulic pressure is connected to the input side of the sub transmission mechanism 4 so as to be linked.

In the hydraulic continuously variable transmission 3, a hydraulic motor 2 and a hydraulic pump 1 are connected by two hydraulic pipes 9 for circulating high pressure oil and low pressure oil.
The input shaft 10 and the output shaft 12 of the prime mover 11 are stretched and interlocked with each other by a transmission belt 13. The gear stepped transmission 5 has a transmission gear 14 for shifting the built-in auxiliary transmission mechanism 4 in high and low directions, and a transmission shaft 15 for slidingly shifting it by a spline or the like, which is pivoted to the input side. The shifter shaft 17 on which the shifter 16 for shifting is mounted is attached to the gear case 1
8 is an electromagnetic actuator that is provided so as to project outward from the shifter shaft 8, and shifts the shifter 16 to the high speed or low speed position by shifting the shifter 16 to the other end of the link arm A19 whose one end is connected to the shifter shaft 17. 20 are connected and configured.

In the hydraulic continuously variable transmission 3, a swash plate swing shaft A21 for changing the swash plate angle for shifting the hydraulic motor 2 between high and low is provided so as to project outward from the motor case 22. Electromagnetic for changing the swash plate angle to a high speed or a low speed position by swinging the swash plate swinging shaft A21 to the other end of the swash plate swinging arm A23, one end of which is attached to the swash plate swinging shaft A21. The actuator A24 is connected and configured.

The hydraulic pump 1 for rotating the hydraulic motor 2 by hydraulically operating the swash plate swing shaft B2 for changing the swash plate angle in order to continuously change the vehicle speed during combine operation.
5 is provided so as to project outward from the pump case 26, and the other end of the swash plate swing arm B27, one end of which is pivotally attached to the swash plate swing shaft B25, and the manual switch located at the cockpit. The lower end of the main shift lever 28 that is operated is connected by a link arm B29.

A grip 30 for manual operation is provided on the upper end of the main gear shift lever 28, and a switch 31 for switching the vehicle speed is provided on the grip 30. The vehicle speed mode switched by the changeover switch 31 is, for example, as shown in FIG. 2, when the subtransmission mechanism 4 is set to "low" and the hydraulic motor 2 is switched to "low", in a bad condition such as a fallen culm or a wet field. The "low speed mode (a)" to be used is set, and then the auxiliary transmission mechanism 4 remains "low" and the hydraulic motor 2 is set to "high".
When it is switched to, it becomes the "standard speed mode (b)" used for normal rice harvesting, and then the auxiliary transmission mechanism 4 is set to "high".
When the hydraulic motor 2 is switched to "Low", it becomes the "high speed mode (C)" used during wheat mowing, and then the sub transmission mechanism 4 remains "High" and the hydraulic motor 2 is switched to "High". In this case, the above four types of vehicle speed modes are set and configured so as to be the "running speed mode (d)" used at the time of leading other than harvesting. The contents and the number of types of the speed change combinations in these vehicle speed modes can be freely combined without being concerned with the present invention. Further, the subtransmission mechanism 4 is not limited to be operated by the electromagnetic actuator 20, but may be manually operated.

Further, the changeover switch 31, the electromagnetic actuator 20 and the electromagnetic actuator A24 operated by the changeover switch 31, and a vehicle speed mode controller 32 for controlling them are electrically connected to each other. . Next, the operation of the above configuration will be described. When the prime mover 11 is started, the hydraulic pump 1 is driven from the output shaft 12 of the prime mover 11 via the transmission belt 13. By driving the hydraulic pump 1 and operating the main gearshift lever 28, the hydraulic pipe 9 is connected to the hydraulic motor 2.
The hydraulic oil is circulated via the hydraulic motor 2, the hydraulic motor 2 is driven by the hydraulic oil, and the gear stepped transmission 5 is driven by the hydraulic motor 2 via the sub transmission mechanism 4.
By this drive, the traveling output is transmitted to the left and right traveling crawlers 8 via the left and right traveling output shafts 7 to drive the combine.

During power transmission in the traveling device 6 of the combine, among the many combinations of high and low speed changes in the auxiliary transmission mechanism 4 and high and low speed changes in the hydraulic motor 2, By operating the changeover switch 31 provided on the main gearshift lever 28, there is a "low speed mode (a)" which is used in a bad condition or the like according to the working condition at that time,
"Standard speed mode (b)" for normal rice harvesting
And "High-speed mode (C)" used for normal wheat cutting etc.
And four types of speed change areas, "running speed mode (d)" used when traveling other than mowing, can be easily and easily selected and switched with one touch. Further, by this selection switching, it is possible to appropriately select extremely complicated gear selections so as to match the ever-changing work conditions, and it is possible to secure the work performance and eliminate the troublesomeness of the operator's selection.

In FIG. 5, a traveling device 6 having a transmission mechanism of the present invention is further combined with a power steering lever 33 for controlling the traveling direction, and when the power steering lever 33 is braked in the left and right directions, respective contacts are turned on. Is equipped with a power steering switch 34, and the power steering switch 34 is turned on.
The speed change of the hydraulic motor 2 is switched to "low" by turning off the power steering switch 34, and the speed change of the hydraulic motor 2 is returned to "high" by turning off the power steering switch 34. It is possible to improve the safety when performing and increase the turning force.

[Brief description of drawings]

FIG. 1 is a schematic view showing a power transmission mechanism of a combine traveling apparatus.

FIG. 2 is a diagram showing a comparison standard of a combined vehicle speed change mode.

FIG. 3 is a partial front view of a part of the combine traveling apparatus in section.

FIG. 4 is a front view of a part of the combine traveling apparatus.

FIG. 5 is a schematic view showing an operating mechanism of the combine traveling apparatus.

[Explanation of symbols]

 1 hydraulic pump 2 hydraulic motor 3 hydraulic continuously variable transmission 4 auxiliary transmission mechanism 5 gear stepped transmission

Claims (1)

[Claims] 1. A hydraulic continuously variable transmission 3 connecting a hydraulic pump 1 and a hydraulic motor 2 capable of two-stage shifting to a sub transmission mechanism 4.
In a combined traveling transmission that shifts gears by interlocking with a geared stepped transmission 5 that has a built-in gear,
A combine speed change device capable of selecting a speed change region that combines low changeover and high / low changeover of the auxiliary transmission mechanism 4.