JPS6318500Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mobile agricultural machine represented by a tractor that is equipped with a hydraulic deflock mechanism and a parking brake mechanism that are advantageous for unmanned automatic driving. By rationally arranging the pistons and the control valves that control their operation, it is possible to make the entire structure compact and inexpensive by making the structural members compatible.

The characteristic structure of the mobile agricultural machine with a differential lock and parking brake mechanism according to the present invention, which was made to achieve the above object, is that the hydraulic differential mechanism, the hydraulic parking brake mechanism, and the differential mechanism are installed in one side of the transmission case body. , a transmission case is configured by providing a bearing support case for a differential mechanism built into the transmission case body;
The bearing support case of the transmission case is formed with a cylinder part for the interior of the piston that operates the deflock mechanism and the parking brake mechanism, and a control valve that controls the operation of the piston is provided on the outside of the bearing support case. The bearing support case is further provided with a port for communicating and connecting the control valve and the pressure chamber of the cylinder portion.

The effects of the present invention having such a characteristic configuration are as follows.

In other words, by housing the pistons of both mechanisms in the bearing support case, not only can the cylinders of both mechanisms be used as the bearing support case, but also the control valve that controls the operation of both mechanisms is installed outside the bearing support case. By installing the bearing support case, it is possible to eliminate the need for special parts for installing the control valve, and the bearing support case can also serve as the piping flow path from the control valve to the piston, which was conventionally installed as a separate part. Moreover, fluid pressure piping can also be eliminated.

Therefore, as a whole, the number of component parts can be significantly reduced, making it possible to have a compact structure and significantly reducing manufacturing costs.

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

Fig. 1 shows a four-wheel drive tractor equipped with a hydraulic differential lock 5 and a parking brake mechanism 6, which is configured to enable unmanned automatic driving. A hydraulic continuously variable transmission N, a transmission case M, front and rear wheels 2, 2 and 3, 3 are installed below the machine body 1, and a mower, etc., is installed between the front and rear wheels 2, 3. A device 4 is installed.

As shown in FIG. 2, pistons 7 of both mechanisms 5 and 6 are mounted on the side of a transmission case M main body 9' that houses a hydraulic differential lock mechanism 5, a hydraulic parking brake mechanism 6, and a differential mechanism, which will be described later. . installed on.

FIG. 3 shows the parking brake mechanism 6.
An engaging gear 11 fixed to the rear output shaft 10 of the hydraulic continuously variable transmission N and a swinging arm 12 having an engaging portion 12a that can freely engage with the engaging gear 11 are swung around the horizontal axis X. A torsion spring 13 is fitted to the horizontal shaft to always urge the swing arm 12 into the engaged state. The swing arm 12 is attached to the spring 13 by hydraulic pressure on the side opposite to the engaging portion 12a of the swing arm 12.
A piston 8 which is caused to swing against the urging force of is in contact with the bearing support case 9, and is slidably supported by the bearing support case 9. A hydraulic port 14 is formed in the pressure chamber 8a of the bearing support case 9 corresponding to the sliding end of the piston 8, and a control valve 15 is attached to the upper end surface of the bearing support case 9 at the inlet end 14a of the hydraulic port. It is being still,
The piston 8 can also be actuated by a manual lever (not shown).

FIG. 4 shows the differential lock mechanism 5, which meshes with an engaging portion 18a of a shifter 18, which will be described later, on one end side of the differential case 17 of the differential mechanism supported in the transmission case M via bearings 16, 16. A piston 7, which is a shift fork that forms an engaged portion 17a that performs a deflocking action and also controls the sliding of a shifter 18 that is slidably fitted on the differential gear shaft 19, is attached to the bearing support case 9 by a spring 20. is supported in a biased state,
A hydraulic port 21 is formed in the pressure chamber 7a of the bearing support case 9 at a portion corresponding to the sliding end of the piston 7, and a control valve 15 is attached to the upper end surface of the bearing support case 9 at the inlet end 21a of the hydraulic port 21. There is.

The four-wheel drive system is as follows: the engine E output is transmitted to the front wheels 2, 2 via a hydraulic continuously variable transmission N, and is further transmitted to the rear wheels 3, 3 through a transmission case M inside the transmission case M. The transmission is then reduced by one step.
Power is transmitted to the working device 4 from an oil cooler fan shaft 22 via a belt. As shown in FIG. 5, hydraulic power is transmitted to the differential lock mechanism 5 and the parking brake mechanism 6 from a hydraulic pump 23 parked by the engine E via the control valve 15. Incidentally, the differential lock 5 and the parking brake mechanism 6 may be pneumatic. Further, although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the mobile agricultural machine with a differential lock and parking brake mechanism according to the present invention, in which Fig. 1 is a side view of the entire tractor, Fig. 2 is a perspective view showing the overall arrangement, and Fig. 3 is a longitudinal section showing the parking brake mechanism. A side view, Fig. 4 is a longitudinal rear view showing the deflock mechanism,
FIG. 5 is a hydraulic system diagram. 5...Fluid pressure differential lock mechanism, 6...Fluid pressure parking brake mechanism, 7, 8...Piston, 7
a, 8a...pressure chamber, 9...bearing support case, 9'...mission case body, 14, 21
...Port, M...Mission case, 15...
control valve.

Claims (1)

[Scope of utility model registration request] A bearing support case 9 for the differential mechanism housed in the transmission case body 9' is provided on one side of the transmission case body 9' in which the hydraulic differential lock mechanism 5, the hydraulic parking brake mechanism 6, and the differential mechanism are housed. Mission case M
The bearing support case 9 of the transmission case M is provided with cylinder parts 9A and 9B for the interior of the pistons 7 and 8 that operate the deflock mechanism 5 and the parking brake mechanism 6, as well as bearing support thereof. Control valves 15 and 1 are provided outside the case 9 to control the operation of the pistons 7 and 8.
5, and further, the control valves 15, 15 and the cylinder portion 9 are attached to the bearing support case 9.
A mobile agricultural machine with a defrock and parking brake mechanism, which is formed with ports 14 and 21 for communicating and connecting pressure chambers 7a and 8a of A and 9B.