JPH0123328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a transmission device for a mobile vehicle having a crawler type traveling device such as a combine harvester or a small construction machine.

(b) Prior art In the conventional hydraulic clutch type transmission,
Like the technology described in Utility Model Publication No. 58-38182,
It had a transmission with four forward speeds and two reverse speeds.

(c) Problems to be Solved by the Invention However, in the conventional configuration, three shafts each having two hydraulic clutch devices are arranged between the input shaft and the output shaft, and two is the forward gear shift axis,
The difference is that one shaft is the reverse gear shaft, but three gear shift shafts are arranged around the output shaft. The idle gear for the reverse speed change shaft was supposed to be the two loosely fitted gears provided on one of the forward speed change shafts.

All three of the output gears from the three transmission shafts were meshed with the fixed gear on the output shaft.

Therefore, since the output shaft is located at the center of the transmission case, the center of the transmission case bulges out in the front and back.

In the present invention, by arranging the reverse gear shaft not around the output shaft but around the input shaft, even if the upper part of the transmission case bulges out, the lower part can be shortened from front to back. The transmission is designed to be able to be placed in a vertically long and narrow space, such as in the case of a crawler type traveling device.

(d) Means for solving the problem The purpose of the present invention is as described above, and the configuration for achieving the purpose will be explained.

A first forward speed change shaft 2, a reverse speed change shaft 3, and a second forward speed change shaft 4 are provided between the input shaft 1 and the output shaft 5, parallel to the two shafts 1 and 5, and the first forward speed change shaft 2 and the reverse speed change shaft 2 are connected to each other. Two loosely fitted gears 28, 29, 31, which are input to and rotated by the fixed gears 24, 70, 25 on the input shaft 1, are connected to the transmission shaft 3 and the second forward transmission shaft 4.
30, 53, 35, and the loosely fitted gears 28, 29, 31, on each transmission shaft 2, 3, 4.
Hydraulic clutches 48, 47, 50, 49, 52, and 51 are provided in parallel with the gear shift shafts 2, 3, and 35 for selectively coupling each gear to the shift shafts 2, 3, and 4, respectively. , 3, 4 have output gears 26, 32,
34, output gears 26, on the transmission shafts 2, 4;
34 directly meshes with the fixed gear 36 on the output shaft 5, and the output gear 32 on the reverse speed change shaft 3 meshes with the output gear 33 on the second forward speed change shaft 4, so that four forward speeds
It is configured to provide two reverse speeds.

(E) Embodiments and operations The purpose and structure of the present invention are as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of a combine harvester equipped with a crawler type traveling device.

A crawler type traveling device 18 is driven by a drive sprocket 10.

The transmission device inside the transmission case 9 is the main part of the present invention, and the drive sprocket 1 is attached to the left and right drive shafts 8L and 8R protruding from both sides of the transmission case 9.
0 is fixed. Each piece of equipment in a combine harvester is mounted on a crawler-type traveling device. A grass dividing plate 13 projects from the tip, and after the grass is divided by the grass dividing plate 13, a lodging grain culm is raised by a raising device 12.
At the same time, the reaping device 15 harvests the stock base, and the stock base transport device 14 transports the stock to a lower level of the vertical transport device 16.

The length of the culm is adjusted by the vertical conveyance device 16 and transferred to the feed chain 27 of the threshing device 19. The tip of the ear is carried by the upper conveying device 23 to the inlet of the handling barrel of the threshing device 19. The grain is threshed in the threshing device 19, and the waste culm is conveyed to the waste culm processing device 21 in the waste culm chain for processing.

FIG. 2 is a sectional view of the inside of the transmission case 9 showing the main parts of the present invention, FIG. 3 is a transmission line diagram, and FIG.
The figure is a drawing showing the arrangement of the shafts of the mission case 9.
FIG. 5 is a drawing showing the gear shift guide groove of the gear shift lever 22. As shown in FIG.

An input pulley 62 is provided at the end of the input shaft 1 protruding from the upper part of the transmission case 9.
Power is transmitted from the engine to the input pulley 62 by a V-belt.

As shown in FIG. 4, a first forward speed change shaft 2, a reverse speed change shaft 3, and a second forward speed change shaft 4, which support a hydraulic clutch device, are arranged around the input shaft 1. Three fixed gears 24, 25, and 70 are fixedly installed on the input shaft 1, and are constantly connected to the gears of the hydraulic clutch device on the first forward speed change shaft 2, the reverse speed change shaft 3, and the second forward speed change shaft 4. They mesh together.

First, on the small diameter fixed gear 25 on the input shaft 1,
The input loose gear 29 of the hydraulic clutch device 47 on the first forward gear shaft 2, the input loose gear 30 of the hydraulic clutch device 49 on the reverse gear shaft 3, and the hydraulic clutch device 51 on the second forward gear shaft 4. input loose gear 3
Gears with the same number of teeth as 5 are always in mesh.

Further, the medium diameter fixed gear 70 on the input shaft 1 has an input loose fit gear 31 of the hydraulic clutch device 50 of the reverse gear shift shaft 3, and an input loose fit gear 53 of the hydraulic clutch device 52 of the forward hydraulic clutch shaft 4. 2 gears with the same number of teeth
The two pieces are always engaged.

Therefore, no matter which of the hydraulic clutch devices 47, 49, 51 on the first forward speed change shaft 2, reverse speed change shaft 3, and second forward speed change shaft 4 are connected, the rotation will be the same, and the hydraulic pressure of the hydraulic clutch devices 50, 52 will be the same. Even if the clutch device is connected, it will rotate at the same speed and in the same direction.
However, the rotational input to the hydraulic clutch device 48 on the first forward transmission shaft 2 is designed to be particularly fast. Among the three fixed gears on the input shaft 1, the larger diameter fixed gear 2
Only one gear 4 is in constant mesh with the input loose gear 28 of the hydraulic clutch device 48, and is configured to rotate particularly quickly among the six hydraulic clutch devices. This hydraulic clutch device obtains the speed of the fourth forward speed, and FIG. 5 shows the speeds of F4 and F8.

F1, F2, and F3 are the speeds for reaping work, and F4 is the speed for stopping the reaping work and traveling.

Therefore, there is no need to change the groove using a variable lever when moving from reaping work to traveling work, and the work can be performed by only reciprocating one groove in the front and back direction.
The other gears that change the forward, reverse, and gear stages are the output gears 26, 32, 33 of the transmission shafts 2, 3, and 4.
It is 34.

First, the output gear 32 of the reverse gear shaft 3 is always in mesh with the output gear 33 on the hydraulic clutch shaft 4, so when rotation is not transmitted to the hydraulic clutch shaft 5, the hydraulic clutch shaft 4 plays the role of a reverse rotation shaft. However, the hydraulic clutch device on the reverse speed change shaft 3 serves as the first and second reverse speeds. That is, the output gears 33 and 34 also serve as reverse idling gears.

Further, the output gear 26 on the first forward speed change shaft 2 always meshes with the input gear 36 of the sliding gear shaft 5, and the output gear 34 on the second forward speed change shaft 4 also always meshes with the fixed gear 36 of the output shaft 5. They mesh, but 26 is larger than 3
4 is smaller, so the hydraulic clutch devices 47 and 48 on the first forward speed change shaft 2 are used for the second and fourth forward speed stages, and the hydraulic clutch devices 51 and 52 on the second forward speed change shaft 4.
are the first and third forward stages.

The first forward stage is transmitted from the fixed gear 25 of the input shaft 1 to the input loose gear 35 on the second forward speed change shaft 4,
By connecting the hydraulic clutch device 51, the output gear 3
4 to the fixed gear 36 on the output shaft 5.

The second forward stage is transmitted from the fixed gear 25 on the input shaft 1 to the input loose gear 29 on the first forward gear shaft 2, and from the output gear 26 on the sliding gear shaft 5 by connection to the hydraulic clutch device 47. The signal is transmitted to the fixed gear 36.

The third forward stage is transmitted from the fixed gear 70 on the input shaft 1 to the input loose gear 53 on the second forward gear shift shaft 4, and is transmitted from the output gear 34 to the fixed gear on the output shaft 5 by connection of the hydraulic clutch device 52. The signal is transmitted to the gear 36.

The fourth forward stage is transmitted from the fixed gear 24 on the input shaft 1 to the input loose gear 28 on the first forward speed change shaft 2, and is transmitted from the output gear 26 to the fixed gear on the output shaft 5 by connection of the hydraulic clutch device 48. It is transmitted to the setting gear 36.

The first reverse gear is transmitted from the fixed gear 25 on the input shaft 1 to the input loose fit gear 30 on the reverse gear shaft 3, and the second forward gear is transmitted from the output gear 32 on the reverse gear shaft 3 through the transmission of the hydraulic clutch device 49. Fixed gear 36 on output shaft 5 via output gears 33 and 34 on transmission shaft 4
will be communicated to. Output gear 3 on second forward gear shaft 4
3 and 34 also serve as idling gears for reversing.

The second reverse gear is transmitted from the fixed gear 70 on the input shaft 1 to the input loose gear 31 on the reverse gear shaft 3, and is transmitted from the output gear 32 on the reverse gear shaft 3 to the second gear by connecting the hydraulic clutch device 50. It is transmitted to the fixed gear 36 on the output shaft 5 via the output gears 33, 34 on the forward speed change shaft 4. Similarly, the output gears 33 and 34 on the second forward speed change shaft 4 also serve as idling gears for reverse movement.

Next, an auxiliary transmission is configured between the output shaft 5 and the counter shaft 6.

Among the double sliding gears 38 and 37 on the output shaft 5, the smaller diameter gear 37 is the double gear 39 on the counter shaft.
By meshing with 40, which is the larger diameter one of the 40, a low sub-shift is obtained, and by meshing between 38 and 39, a high sub-shift is obtained.

With the sub-shift low, 2 reverse speeds and 4 forward speeds, i.e. R
1, R2, F1, F2, F3, F4 gears are obtained, and depending on the sub-shift height, R3, R4, F5, F6,
F7 and F8 are obtained.

The height of this sub-shift is set by rotating the shift lever 22 left and right to slide the double sliding gears 37 and 38, and by rotating the shift lever 22 back and forth, the hydraulic directional control valve is moved, thereby controlling the six hydraulic clutch devices. When configured to select the oil passages, the speed change guide plate can be configured in an H-shape as shown in FIG. If the sub-shift has 3 speeds, it will be the 〓 type, and if it has 4 speeds, it will have the 〓 type.

On the counter shaft are hydraulic cylinders 61 for left and right hydraulic steering clutch devices and hydraulic brake devices.
L, 61R are provided, and the sliding gear 45L,
A steering clutch is constructed by sliding gear 45R into and out of engagement with internal gears 44L and 44R.

The sliding gears 45L and 45R also serve as holders for the friction plates of the disc brake device, and the steering brake device 46 gradually moves after the steering clutch is disengaged by the overlapping lateral movement of the hydraulic cylinders 61L and 61R.
L and 46R operate. 54 is a parking brake device.

On the seventh shaft 7, left and right reduction gear devices 41L, 4
1R, 42L, and 42R are provided, and mesh with final gears 43L and 43R on the eighth shaft 8, which is a drive shaft.

As shown in FIG. 4, transmission shafts 2, 3, and 4 are arranged around the input shaft 1, and a reverse transmission shaft 3 is arranged around the input shaft 1.
The upper gear meshes with gears on the input shaft 1 and the second forward speed change shaft 4. The gear on the output shaft 5 is in a position to mesh with the gears on the second forward speed change shaft 4 and the first forward speed change shaft 2.

FIG. 5 shows a configuration in which the main gear shift and the auxiliary gear shift can be steered with one lever, and shows a plan view of the gear shift guide plate 63 on the side of the steering column 17 in a combine harvester.

If one of the shift levers 22 is configured in an H shape, it is possible to shift 8 forward speeds and 4 reverse speeds without operating the main clutch, and if the auxiliary shift lever 22 is set to 3 speeds and configured in an H shape, it is possible to shift to 12 forward speeds. , 6 reverse speeds can be changed to 4 speeds if the auxiliary gear is changed to 4 speeds, and the forward speed is 16 speeds.
Eight speeds of speed and reverse can be achieved without operating the main clutch.

In each of the main transmission grooves in the longitudinal direction, the fastest speed part is configured to have a running speed that is more than twice as fast as the working speed constituted by the other forward speeds, so only when driving is the other main transmission groove There is no need to increase the speed with the help of an auxiliary transmission, and you can always select the main transmission groove in the front-rear direction according to the field conditions, and the rest can be done by simply operating the transmission lever in the front-rear direction. It is.

For example, it is possible to use different main transmission grooves for wet fields and dry fields, or to select the main transmission groove according to the maturity of the grain culm, the wetness after rain, etc.

(F) Effects of the Invention Since the present invention is constructed as described above, it achieves the following effects.

Firstly, in the technology described in Japanese Utility Model Publication No. 58-38182, three speed change shafts are arranged in a fan shape around the output shaft which is located approximately at the vertical center of the transmission case 9. The transmission case 9 had a bulging shape at its upper and lower center positions.

Therefore, in crawler-type traveling devices, etc., the installation space of the transmission case is often long and narrow, resulting in the problem that the transmission case cannot be installed.

On the other hand, in the case of the present invention, the three transmission shafts 2, 3, and 4 with hydraulic clutches are arranged in a fan shape around the input shaft 1, so the upper part of the transmission case bulges out. Since only the transmission shafts 2 and 4 are disposed around the central output shaft 5, the construction can be made narrow and can be inserted into a vertically narrow transmission case installation space.

Second, a large gear is often installed on the lower output shaft in order to achieve a large deceleration rate.
For this reason, as in the past, in order to prevent the three gears on the transmission shaft arranged around the output shaft from engaging with the gears on the lower shaft, it is necessary to arrange the three shafts in front and behind. This is why the expansion part in the center of the transmission case was made larger.

On the other hand, when three transmission shafts are arranged around the input shaft 1 as in the case of the present invention, there is no shaft above the input shaft, or even if there is a shaft with a small-diameter gear interposed therein. Therefore, the three shift shafts 2, 3, and 4 are
Since it can be arranged in a letter shape, it is possible to eliminate the front and rear expansion parts and create a vertically long mission case.

[Brief explanation of drawings]

Fig. 1 is an overall side view of a combine harvester, which is a mobile vehicle with a crawler-type traveling device, Fig. 2 is a sectional view of the transmission case, Fig. 3 is a transmission line diagram of the transmission of the present invention, and Fig. 4. 5 is a side view of the transmission case showing the arrangement of the shafts, and FIG. 5 is a plan view of the speed change guide plate. DESCRIPTION OF SYMBOLS 1... Input shaft, 2... First forward gear shift shaft, 3... Reverse gear shift shaft, 4... Second forward gear shift shaft, 5... Output shaft, 6... Counter shaft, 9... Mission case, 24, 2
5, 70...Fixed gear on input shaft, 26, 32, 3
3, 34...Output gear of hydraulic clutch shaft, 28, 2
9, 30, 31, 35, 53...Input loose gear of hydraulic clutch device, 36...Fixed gear of output shaft 5, 4
7, 48, 49, 50, 51, 52...Hydraulic clutch device.

Claims (1)

[Claims] 1 Between the input shaft 1 and the output shaft 5, a first forward speed change shaft 2, a reverse speed change shaft 3, and a second
A forward speed change shaft 4 is provided, and 2 is inputted from the fixed gears 24, 70, 25 on the input shaft 1 to the first forward speed change shaft 2, the reverse speed change shaft 3, and the second forward speed change shaft 4 and rotated. Individual free-fit gears 28, 29, 3
1, 30, 53, 35, and the loosely fitted gears 28, 29, 3 on each transmission shaft 2, 3, 4.
Hydraulic clutches 48, 47, 50, 49, 52, and 51 are provided in parallel to the transmission gears 1, 30, 34, and 35 for selectively coupling each gear to each transmission shaft 2, 3, and 4, and Output gear 26 on shafts 2, 3, 4,
32, 34, the output gears 26, 34 on the transmission shafts 2, 4 directly mesh with the fixed gear 36 on the output shaft 5, and the output gear 32 on the reverse transmission shaft 3 meshes directly with the fixed gear 36 on the output shaft 5.
A transmission device characterized in that it is configured to mesh with an output gear 33 on a forward transmission shaft 4 to obtain four forward speeds and two reverse speeds.