JPH0351212Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a travel transmission structure for a vehicle in which a pair of left and right travel devices can be independently driven by hydraulic motors.

[Conventional technology]

Conventionally, as the above-mentioned transmission structure, for example,
As shown in Japanese Patent No. 19425, there is a combine harvester in which the left and right crawler devices are each configured to be able to be rotated forward and backward and controlled by a hydraulic motor.

[Problem that the invention attempts to solve]

Further, as shown in the above-mentioned reference, a speed reduction mechanism is often interposed between the hydraulic motor and the traveling device.

However, in cases where the vehicle body width is relatively small, such as a small combine harvester, it may be difficult to arrange a deceleration case between the left and right crawler traveling devices, so there is room for improvement.

An object of the present invention is to provide a traveling transmission structure that can be easily installed between the left and right traveling devices even in a vehicle having a relatively small width such as a small combine harvester.

[Means for solving problems]

The feature of the present invention is that, in the vehicle having the above configuration, a reduction gear mechanism is provided with a transmission shaft disposed in a substantially horizontal state facing left and right between the input shaft of each of the left and right traveling devices and the output shaft of each hydraulic motor. The transmission case that houses these two speed reduction mechanisms is composed of a central vertical wall and outer wall cases placed on the left and right sides of this vertical wall. In addition to housing the mechanisms respectively, the axes of the left and right transmission shafts are set to be mismatched, and the bearing portions on the vertical walls of the left and right transmission shafts are provided to overlap with each other in the direction of the axes. Yes, its effect,
And the effects are as follows.

[Effect]

As shown in FIGS. 1 and 3, the above characteristics are as follows: from the output shafts 4a, 4a of the left and right hydraulic motors 4, 4, respectively, to the input shafts 18, 18 of the left and right traveling devices 1, 1, respectively.
By setting the transmission path leading to approximately V-shape in side view, the transmission shafts 20, 20 of the reduction gear mechanism
When the axes P and P of
It becomes possible to make the bearing parts A and A in the vertical walls 15 of 0 and 20 overlap with each other in the direction of the axis P of the transmission shaft 20.

[Effect of idea]

Therefore, the transmission case has a relatively simple structure consisting of a vertical wall and an outer wall case, and the axes of the transmission shafts are set to be mismatched.
Compared to a structure in which the left and right deceleration structures are constructed using two transmission cases, the lateral size can be reduced by the heat of the four casings due to the overlap of the bearings, which is impossible even for vehicles with relatively small body widths. A traveling transmission structure that can be installed between the left and right traveling devices without any problems was obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 6, a threshing device 2 is mounted on a vehicle body that runs on a pair of left and right crawler traveling devices 1, 1, and the planted grain culms are harvested at the front of the vehicle body before being transported and supplied to the threshing device 2. The processing units 3 are connected to form a combine harvester.

In the combine, a pair of left and right running devices 1,
1 so that each gear can be changed independently and steplessly,
The left and right traveling devices 1, 1 are configured to be driven by one hydraulic motor 4, 4 respectively. In other words, as shown in Fig. 4, the engine 5 mounted on the car body
The oil passage system is configured to drive two variable capacity hydraulic pumps 6, 6 and to supply hydraulic pressure from the hydraulic pumps 6, 6 to the hydraulic motors 4, 4. The transmission system is configured such that the power from the casing C is transmitted through the transmission case C to the sprockets 1s, 1s that drive the left and right crawler belts 1v, 1v.

The pair of levers 7, 7 for steering operation provided on the driving part of the vehicle body and the trunnion shafts 6a, 6a of the hydraulic pumps 6, 6 are operably linked, so that the levers 7, 7, respectively The vehicle can travel straight and turn by simultaneous or selective operation.

Further, the trunnion shafts 6a, 6a are arranged so that the vehicle speed can be detected from the operation amount of the trunnion shafts 6a, 6a.
is linked with potentiometers 8,8. That is, as shown in FIG. 5, a disk 10 is attached to the trunnion shaft 6a on which a detent mechanism 9 acts, which sets and holds the shaft 6a at a neutral position where the operation of the hydraulic motor 4 is stopped. A recess 10a is formed in which the ball 9a of the detent mechanism 9 can fit. Further, a half-moon-shaped gear 11 and an operating arm 12 are attached to the outside of the disk 9 by bolts 13, 13, and the operating amount of the trunnion shaft 6a is expanded through a small-diameter gear 14 that engages with the half-moon-shaped gear 11. The rotation shaft 8a of the potentiometer 8 is connected to the small diameter gear 14 for detection.

Note that the operating arm 12 is linked to the operating lever 7.

The transmission case C has a one-block structure so that the power from the two hydraulic motors 4, 4 is reduced in speed and transmitted to the sprockets 1s, 1s.

That is, as shown in FIGS. 1 and 2, the transmission case C is composed of a vertical wall 15 in the center and outer wall cases 16, 16 disposed on the left and right sides of the vertical wall 15. Reduction mechanisms D, D having a gear structure combined so that Input shafts 18, 1 are input to the speed reduction mechanisms D, D via the cases 17, 17, and outputs from the speed reduction mechanisms D, D are connected to the sprockets 1s, 1s.
It is structured to convey information to 8 people.

Further, each of the speed reduction mechanisms D, D is composed of four gears 19... and two transmission shafts 20, 20 disposed in a substantially horizontal state facing left and right, and further includes a hydraulic motor 4 as shown in FIG. , 4 respective output shafts 4a,
By setting the power transmission path from 4a to the shafts 18, 18 input to the left and right sprockets 1s, 1s in a substantially V-shape in side view, the left and right power transmission shafts 20,
20, 20, bearing parts A, which are the inner ends of 20,
A and A are made to overlap in the direction of the axes P and P of the transmission shafts, respectively, in order to reduce the case width.

Further, as shown in FIG. 1, a semicircular opening T is formed on the connecting surface of the left and right deceleration cases 17, 17 and the transmission case C so that the deceleration case 17 and the transmission case C communicate with each other. , aiming to reduce weight.

[Another example]

In addition to the embodiments described above, the present invention may be applied to, for example, a working vehicle with a multi-wheeled traveling device, and the speed reduction mechanism may have a chain transmission structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the vehicle running transmission structure according to the present invention, in which Fig. 1 is a longitudinal sectional front view of the transmission case, Fig. 2 is a perspective view of the transmission case, and Fig. 3 shows the transmission system inside the transmission case. FIG. 4 is a schematic side view, FIG. 4 is a hydraulic circuit diagram showing the drive structure of the hydraulic motor, FIG. 5 is a side view showing the mounting state of the potentiometer, and FIG. 6 is a side view of the front part of the combine. 1... Travel device, 4... Hydraulic motor, 4a...
Output shaft of hydraulic motor, 15... Vertical wall, 16... Outer wall case, 18... Input shaft of traveling device, 20...
Transmission shaft, A...Bearing part, C...Transmission case, D
...Reduction mechanism, P...Transmission shaft axis, S...Space.

Claims (1)

[Scope of utility model registration request] In a vehicle travel transmission structure configured such that a pair of left and right traveling devices 1, 1 can be driven independently by hydraulic motors 4, 4, input shafts 18, 18 of left and right traveling devices 1, 1, respectively, and hydraulic motors 4, 4, respectively. The speed reduction mechanisms D, D are equipped with transmission shafts 20, 20 disposed in a substantially horizontal state between the output shafts 4a, 4a of the
A transmission case C housing these two speed reduction mechanisms D and D is connected to the central vertical wall 15 and this vertical wall 15.
It is composed of three outer wall cases 16, 16 disposed on the left and right outer sides of the vertical wall 15, and the reduction mechanism D is housed in the spaces S, S formed on both sides of the vertical wall 15, respectively. The axes P and P of the transmission shafts 20 and 20 are set to be in a mismatched state, and the bearing portions A and A of the left and right transmission shafts 20 and 20 on the vertical wall 15 are overlapped with each other in the direction of the axis P. A vehicle travel transmission system installed in a vehicle.