JPS6233636Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hydraulic operating device for a vehicle, in which a hydraulic device such as a hydraulic high-low speed switching device installed in a power system is controlled by a hydraulic control valve. The purpose is to facilitate the operation of the hydraulic control valve and to facilitate the connection of the hydraulic system.

BACKGROUND ART Vehicles, such as tractors, have been proposed in which a hydraulic high-low speed switching device is installed in the driving power system of the vehicle, so that the high speed state is always set, and the high speed is switched from high speed to low speed when the load is high. In this case, the high-low speed switching device is controlled by a hydraulic control valve, but in the past, the hydraulic control valve was attached to the vehicle body near the bottom of the driver's seat, and the operating lever was taken directly from the hydraulic control valve. It was very difficult to do so, and there were problems in terms of operability.

The present invention has been developed to solve these conventional problems, and is characterized by a shift cover 6 that supports the shift lever 7 on the vehicle body 1 near the bottom of the instrument panel 8. In a vehicle in which the handle 12 is supported by a frame 15 erected on the vehicle body 1 so as to be located in the instrument panel 8 near the rear wall 33 of the instrument panel 8, On the gear shift cover 6,
The hydraulic control valve 19 is installed so that the spools 20 and 21 protrude forward, and the hydraulic control valve 19
are connected to the hydraulic system 5 of the power system in the vehicle body 1 through oil passages 26 and 27 formed in the transmission cover 6, and operating levers 28 and 29 protruding rearward from the rear wall 33 of the instrument panel 8 are connected to the instrument panel 8. Pivotally attached to the upper part of the frame 15 by a horizontal support shaft 30 within the panel 8,
Near the bottom of the frame 15 and the hydraulic control valve 19
Operating levers 43, 44 are pivotally mounted near the front of the operating levers 43, 44 by horizontal support shafts 47.
and the operating levers 28, 29 are interlocked and connected by vertical rods 38, 39 within the instrument panel 8, and the operating levers 43, 44 are linked to the spools 20, 21 of the hydraulic control valve 19.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 to 5, reference numeral 1 denotes a tractor body, which is composed of an engine, a clutch housing 2, a transmission case 3, etc., and the clutch housing 2 and transmission case 3. The case 3 is divided into front and rear sections by a partition wall 4. A hydraulic high/low speed switching device 5, a gear transmission, etc. are built into the transmission case 3, and the gear transmission can be operated by a transmission lever 7 supported by a transmission cover 6 on the transmission case 3. It is. Reference numeral 8 denotes an instrument panel, which is provided at the rear of the tractor body 1 so as to be continuous with the bonnet covering the engine, etc., at the front of the tractor body 1, and predetermined instruments 9 are provided on the instrument panel 8. Reference numeral 10 denotes a fuel tank provided within the instrument panel 8, and is supported on the clutch housing 2 via a tank holder 11. A handle 12 is supported by a handle post 14 via a handle shaft 13, and the handle post 14 is attached within a U-shaped handle frame 15 so as to be adjustable forward and backward. The handle frame 15 has a mounting plate 16 on the clutch housing 2.
The steering control valve 18 is attached to a support case 17 mounted through a support case 17, and a steering control valve 18 with which the handle shaft 13 is interlocked is incorporated within the support case 17. A hydraulic control valve 19 has a first control spool 20 for controlling the high-low speed switching device 5 and a second spool 21 for controlling the hydraulic clutch 21 of the front wheel drive system. Multiple bolts 22 are mounted on the gear shift cover 6 near the bottom of the panel 8.
It is installed by The hydraulic control valve 19 is connected to a hydraulic pump 24 via a pipe 23 and to a hydraulic clutch 21 via a pipe 25, and is connected via oil passages 26 and 27 formed in the transmission cover 6 and the partition wall 4. It is connected to the high/low speed switching device 5. Note that the hydraulic control valve 19 is attached to the front end of the transmission cover 6. 28 is a first operating lever, and 29 is a second operating lever. These operating levers 28 and 29 are movable up and down via bosses 31 and 32 on a support shaft 30 fixed near the upper end of the handle frame 15. The long hole 3 in the vertical direction is supported and formed in the rear wall portion 33 of the instrument panel 8.
It is made to protrude rearward from 4 and 35. A connecting pin 36 is located in the middle of each operating lever 28, 29.
37 are fixedly installed, and a first rod 38 and a second rod 39 are connected to the connecting pins 36 and 37, respectively. Further, tension springs 41 and 42 are hung between the connecting pins 36 and 37 and both ends of a spring hook pin 40 attached to the handle frame 15 to unstably switch the operating levers 31 and 32 up and down. ing. Each rod 38, 39 is the handle frame 1
The rods 41 and 42 are vertically arranged between the rear wall portion 33 and the rear wall portion 33, and the rods 41 and 42 are connected to a first actuating lever 43 and a second actuating lever 44 at their lower ends. Each operating lever 43, 44 is L-shaped,
It is rotatably supported by a support shaft 47 fixed to a reinforcing plate 45 of the support case 17 via a bracket 46 via bent boss portions 48 and 49, and each of the actuation levers 43 and 44 has a Spool 2
Forked engagement portion 5 that engages with engagement pins 0 and 21
0 and 51 are provided, respectively. Furthermore, handle 1
2. Handle post 14, handle frame 15
etc. are arranged at the center in the lateral direction of the tractor body 1, and the operating levers 28, 29 are provided slightly offset to one side in the lateral direction with respect to these. The support shaft 30 and the support shaft 47 are in the horizontal direction and are provided in parallel.

In the above configuration, each operating lever 28,
29 is held by tension springs 41 and 42 at the solid line position in FIG.
is in a high speed state, and the hydraulic clutch 21 is in a connected state. Therefore, when switching the high/low speed switching device 5 to low speed, it is sufficient to rotate the first operating lever 28 upward around the support shaft 30, and the first operating lever 28 is placed on the rear wall 33 side of the instrument panel 8. The operation at this time is very easy. In addition, the first operation lever 28 is rotated upward and is switched and held by the tension spring 41, so that the first operation lever 28 only needs to be operated upward.
No need for positioning. When the first operating lever 28 rotates to the imaginary line position in FIG.
8, the first operating lever 43 rotates clockwise around the support shaft 47, and the first spool 20 slides forward, thereby switching the high/low pressure switching device 5 from high speed to low speed. , reduce engine load. When the first operation lever 28 is rotated downward, the operation is reversed to that described above, and the high/low speed switching device 5 is switched from low speed to high speed.

When the second operating lever 29 is operated, the hydraulic clutch 21 is operated intermittently, but the operations of the various parts at this time are substantially the same as described above.

Oil passages 26 and 27 connecting the hydraulic control valve 19 and the high/low speed switching device 5 are formed in the transmission cover 6 and the partition wall 4,
Since the shift cover 6 is used as part of the hydraulic fluid supply, the piping structure in the vicinity of the shift cover 6 can be simplified.

It goes without saying that the driver's seat is located behind the instrument panel 8 and the gear shift lever 7. Further, an oil passage for the hydraulic clutch 21 may also be formed in the transmission cover 6.

In the present invention, a hydraulic control valve is attached to the transmission cover, and an oil passage is formed in the transmission cover, so that the transmission cover can be used as a relay section for supplying hydraulic oil, and the piping structure can be simplified. Furthermore, since the operating lever for operating the hydraulic control valve is provided on the rear wall side of the instrument panel, the operating lever can be easily operated. Moreover, since the hydraulic control valve is provided on the shift cover in front of the shift lever, the hydraulic control valve does not become an obstacle for the driver when getting on or off the vehicle, compared to a case where the hydraulic control valve is provided on the rear side of the shift lever. In addition, an operating lever is placed near the front of the hydraulic control valve near the bottom of the frame that supports the handle, and this operating lever is linked with a spool that projects forward from the hydraulic control valve. Since the spool of the hydraulic control valve is operated by the lever, the mechanism of the operating system is simple, and there is no need to provide a link, rod, etc. on the gear shift cover to interlock the operating lever and the hydraulic control valve. Therefore, the problem of malfunction of the hydraulic control valve due to deformation of these links, rods, etc. does not occur. Further, since the operating lever is pivotally connected to the upper part of the frame for supporting the handle within the instrument panel, the pivoting portion can be protected by the instrument panel. In addition, since the operating lever's pivot and the operating lever's pivot are both in the horizontal direction, the movement is smoother than in a case where the two pivots are in different directions, and the hydraulic control valve can be operated smoothly and easily by the operating lever. It is certain.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional side view, FIG. 2 is a cutaway side view of the hydraulic control valve mounting part, FIG. 3 is a cutaway side view of the operating lever support, and FIG. FIG. 1 is a view taken along the - arrow, and FIG. 5 is an exploded perspective view of the main parts. 1... Tractor body, 5... High/low speed switching device,
6... Gear shift cover, 7... Gear shift lever, 8... Instrument panel, 12... Handle, 19... Hydraulic control valve, 20, 21... Spool, 26, 27... Oil path, 28, 29... Operation lever, 38, 39...
Rod, 43, 44...Operating lever.

Claims (1)

[Scope of utility model registration request] A shift cover 6 supporting the shift lever 7 is provided on the vehicle body 1 near the bottom of the instrument panel 8, and
The instrument panel 8 is located near the rear wall 33 of the instrument panel 8.
In a vehicle in which a handle 12 is supported by a frame 15 erected on the vehicle body 1 so as to be positioned inside the vehicle, hydraulic pressure is applied so that the spools 20 and 21 protrude forward on the shift cover 6 in front of the shift lever 7. A control valve 19 is installed, and the hydraulic control valve 19 is connected to the hydraulic system 5 of the power system in the vehicle body 1 via oil passages 26 and 27 formed in the transmission cover 6, and is connected to the rear wall portion 33 of the instrument panel 8. Operating levers 28 and 29 projecting rearward from the instrument panel 8 are pivotally connected to the upper part of the frame 15 by a horizontal support shaft 30, and are located near the bottom of the frame 15 and near the front of the hydraulic control valve 19. The operating lever 4 is operated by a horizontal support shaft 47.
The operating levers 43, 44 and operating levers 28, 29 are interlocked and connected by vertical rods 38, 39 within the instrument panel 8, and the operating levers 43, 44 are connected to the hydraulic control valve 19. A hydraulic operating device for a vehicle, characterized in that it is linked to spools 20 and 21 of the vehicle.