JPS599937Y2 - Traveling transmission device for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a traveling transmission device for a mobile agricultural machine configured to change traveling speeds using a continuously variable transmission device and a stepped transmission device.

When a hydraulic or friction-type continuously variable transmission is used to change the traveling speed, transmission efficiency tends to be better as the transmission speed increases. It is preferable to obtain the required running speed while using the vehicle in a high-speed transmission state with good transmission efficiency.

In order to perform the driving gear change operation according to the above purpose, if the lever for the continuously variable transmission and the lever for the stepped transmission are separately provided and both levers are operated separately, the operation becomes complicated and difficult to handle. Become.

Therefore, the stepped transmission is operated by operating one lever in a first direction, and the lever is operated in a second direction different from the first direction from each operating position of the stepped transmission. He prepared to operate the gearbox, and with that,
Means for operating a stepped transmission and a continuously variable transmission with one lever have been developed, but in this case, when switching the stepped transmission, the lever must be moved in the second direction. This results in a problem in that it is difficult to quickly and easily achieve a desired gear shift state.

The present invention has been developed with the above-mentioned circumstances in mind, and its technical features are as follows.

In other words, a continuously variable transmission and a stepped transmission are arranged in series in one transmission system with respect to one operating lever that is configured to be reciprocally operable along a substantially straight operating path. A traveling transmission device for a mobile agricultural machine configured to change the traveling speed of each transmission device by operating the operating lever by linking the operating mechanisms of the stepped transmission devices, wherein the operating mechanism for the stepped transmission device includes the A first cam having a cam surface configured to sequentially increase or decrease the speed of the stepped transmission device each time the lever is operated within a predetermined range along the operation path; In this step, the continuously variable transmission is operated to increase or decrease the speed by moving a lever along the operating path portions in each of the operating ranges in such a manner that the traveling speeds provided at adjacent ends of each of the path portions are approximately the same. It is characterized by being provided with a second cam with a shaped cam surface.

Therefore, in order to carry out traveling gear shift using a stepped transmission and a continuously variable transmission while using the continuously variable transmission in a high-speed transmission state with as high transmission efficiency as possible, it is necessary to change the shifting state of the right-stage transmission and the continuously variable transmission Utilizing the fact that the actual traveling speed can be determined from the speed change state of By moving the lever along the operating path portions in each of the operating ranges, in cooperation with the action of increasing or decreasing the speed of the continuously variable transmission in a state where the traveling speeds brought about at the adjacent ends of each path portion are approximately the same. Since the purpose is to increase or decrease the running speed almost steplessly by simply operating the lever back and forth along the operating path, it is possible to use the two-lever type mentioned above or the two different types using a single lever. It is now possible to quickly, easily, and accurately perform the required travel speed change without the problems that occur when using the directional operation.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure shows a crawler traveling device 1, a threshing device 2, and a control seat 3.
At the front of this machine, there is a device 4 for raising the planted stem culm into an upright position, a reaping device 5 for cutting the base of the raised stem culm, and a device for transporting the harvested stem culm toward the rear threshing device 2. A combine harvester is shown in which a reaping section consisting of a vertical conveyance device 6 and the like is connected and equipped.

Next, the traveling transmission will be explained.

That is, the output from the engine 7 mounted on the machine is transmitted to the traveling transmission case 9 of the crawler traveling device 1 via a hydraulic continuously variable transmission device 8 that can be switched between forward and reverse directions.

The continuously variable transmission 8 is configured such that the more the swing operating arm 8a is operated upward from the neutral position n, the higher the transmission state is for forward movement, and the more the arm 8a is operated downward, the higher the transmission state for reverse movement is. There is.

A gear transmission type stepped transmission device 10 is installed in the traveling transmission case 9.

As shown in FIG. 3, this transmission 10 has two large and small galles fixed to a drive shaft 11 that is driven by receiving the output from the continuously variable transmission 8.
The gears 11 a, 11 are connected to the transmission shaft 12 parallel to the
The transmission shaft 12 and both gears 12a, 12
b, with friction clutches 13a and 13b interposed between them, which are operated by hydraulic pressure,
By selectively supplying pressure oil to either of the clutches 13a, 13b and switching either of the clutches 13a, 13b to an engaged state, the gearshift system is configured to perform two high and low gear shifts, Moreover, the power after the gear change is transmitted to the gear interlocking mechanism from the output gear 12C.

The friction clutches 13a, 13b are the swing operating arm 1 of the pressure oil switching mechanism 14 using a rotary valve or the like.
By swinging 4a up and down, the pressure oil supply can be selectively switched as described above.

A gear shift lever 15 is installed near the seat 3.

This gear shift lever 15 is connected to a guide frame 16 as shown in FIG.
The lever 15 is configured to be swingable back and forth along the operating path A along the guide groove 16a extending in the front and back direction, and a lever 15 is provided at the base thereof with a lever for operating the continuously variable transmission 8. A first cam body 17 and a second cam body 18 for operating the stepped transmission 10 are fixed to each other.

These cam bodies 17, 18 are rotated by the swinging of the lever 15, and the first and second operated arms 19. 20 is designed to swing when pressed.

The second cam body 18 includes a cam surface S2 for low speed operation that switches the stepped transmission 10 to a low speed state in the range where the lever 15 is operated backward from the A cam surface S1 for high-speed operation that switches the stepped transmission 10 to a high-speed state is provided in the range where the gear is operated further forward.

Further, the first cam body 17 has the lever 15 at the neutral position N.
The first cam surface T1 that switches the continuously variable transmission device 8 to a stopped state when the lever 15 is operated at the neutral position N
The second cam surface T2 switches the continuously variable transmission 8 to a high-speed transmission state as it is operated rearward, and within the range between the neutral position N and the X position, the lever 15 moves forward from the neutral position N. The more the lever 15 is operated, the more the third cam surface T3 switches the continuously variable transmission 8 to a high-speed transmission state, and the more the lever 15 is operated from the neutral position N to the front side, the more the continuously variable transmission changes. A fourth cam surface T4 is provided to switch the device 8 to the high-speed transmission state, and the traveling speeds produced when the lever 15 is operated forward or backward near the X position are the same. In addition, the end portion of the fourth cam surface T4 on the X position side is closer to the end portion of the third cam surface T3 on the X position side than the end portion of the third cam surface T3 on the X position side.
The continuously variable transmission device 8 is set to be switched to a low speed transmission state in consideration of the speed change.

By reciprocating the lever 15 along the operating path A, the traveling speed in the forward and reverse states can be increased or decreased substantially steplessly.

In other words, in the operating path portion A1 corresponding to between the neutral position N and the X position, the continuously variable transmission 8 is increased or decreased in speed while the stepped transmission 10 is used in the low speed state. In the operating path portion A2 corresponding to the front side of the X position, the stepped transmission 10
While the continuously variable transmission device 8 is used in a high-speed state, the speed is increased or decreased in the forward state, and the traveling speeds at the adjacent ends of both operating path portions A1 and A2 are the same. The continuously variable transmission 8 is to be shifted, and the path portion A corresponds to the rear side of the neutral position N.
In No. 3, the continuously variable transmission 8 is configured to increase or decrease speed in the reverse state while the stepped transmission 10 is used in the low speed state.

Incidentally, FIG. 7 illustrates a graph showing the relationship between the traveling speed (2) and the operation position of the lever 15.

In the embodiment, the forward speed is controlled by a two-stage stepped transmission device 10.
Although the example shows that the speed is changed using the continuously variable transmission device 8,
A similar implementation may be performed using a multistage variable transmission 10 having three or more stages.

Furthermore, in carrying out the present invention, if the continuously variable transmission device 8 is operated using the power ram 17 as described in the embodiment, the traveling speed for a unit movement of the lever can be changed by simply changing the shape of the cam surface. The gear shift amount can be changed, for example,
As shown by the imaginary line in FIG. 7, the change rate of the traveling speed in the high speed state of the stepped transmission 10 may be increased or decreased relative to the rate of change in the travel speed in the low speed state.

[Brief explanation of the drawing]

The drawings show an embodiment of the traveling transmission device for a mobile agricultural machine according to the present invention, and FIG. 1 is a side view of a combine harvester, FIG. 2 is a schematic perspective view of the traveling transmission device, and FIG. 3 is a longitudinal cross-sectional side view of the stepped transmission device. Figure 4 is a side view of the first cam body, Figure 5 is a side view of the second cam body, Figure 6 is a plan view of the guide frame, and Figure 7 is a diagram showing the relationship between the operating position of the gear shift lever and the traveling speed. It is a graph showing a relationship. 8...Continuously variable transmission, 10...Stepped variable transmission, 15
...Operation route, A1, A2...Route portion.

Claims (1)

[Scope of utility model registration request] A continuously variable transmission 8 and a stepped transmission 10 are arranged in series in one transmission system with respect to one operating lever 15 configured to be reciprocally operable along a substantially straight operating path A.
This is a traveling transmission device for a mobile agricultural machine configured to change the traveling speed of each transmission device 8, 10 by operating the operation lever 15 by linking the respective operation mechanisms with the stepped transmission device 10. During the operation mechanism, each time the lever 15 is operated by a predetermined range along the operation path A,
A first cam 18 having cam surfaces S1 and S2 for sequentially increasing and decreasing the speed of the stepped transmission 10 is provided, and
The operation mechanism for the continuously variable transmission 8 includes a lever 1 along the operation path portions A1 and A2 in each operation range.
cam surfaces T3 and T that operate the continuously variable transmission 8 to increase and decrease the speed in a state where the traveling speeds brought about at the adjacent ends of the respective path portions A1 and A2 are approximately the same due to the movement of the cam surfaces T3 and T5;
4. A traveling transmission device for a mobile agricultural machine, characterized in that a second cam 17 in the form of a cam 17 is provided.