JPS6145769Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a posture control device for a working machine in a tractor, and an object of the present invention is to facilitate operation during posture control.

In a tractor, a pair of left and right lift arms of a hydraulic system mounted on the rear of the tractor body,
Of the lift rods that connect the pair of left and right lower links of the three-point link mechanism, one is comprised of a double-acting hydraulic cylinder, and the expansion and contraction of this hydraulic cylinder causes the movement of the work equipment attached to the three-point link mechanism. There are some that control posture. However, in conventional devices of this kind, a control valve with an operating lever was installed at the rear end of the tractor body, so when operating the operating lever, the operator had to get off the driver's seat and move the control valve to the rear of the tractor body. I had to turn around to the side, and the operability was very poor.

The purpose of this invention is to solve these conventional problems, and its feature is that the hydraulic system on the tractor body is covered between the left and right rear wheel fenders. A floor cover is provided, a driver's seat is placed on the floor cover, and a hydraulic control lever for the hydraulic system is provided between the driver's seat and one of the rear wheel fenders so that it can be operated forward and backward. lift arm and
In a tractor in which at least one of the lift rods connecting the left and right lower links of the three-point linkage mechanism is configured with a hydraulic cylinder, the control valve for controlling the expansion and contraction of the hydraulic cylinder is installed on the side of the driver's seat and on the floor. It is installed below the cover and inside the lower part of the rear wheel fender, and the control lever of the control valve is located on the rear side of the hydraulic control lever in the longitudinal direction and outside the operating range of the hydraulic control lever, to the side of the driver's seat. It is located at a nearby point.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In FIGS. 1 and 2, 1 is a tractor body, and a transmission case 2 is a structure,
Rear wheels are provided on both rear sides of the tractor body 1 via a brake case 3, a rear axle case 4, etc., and rear wheel fenders 5 are provided to cover the rear wheels from the inside. 6 is a hydraulic system mounted on the rear of the tractor body 1, and a pair of left and right lift arms 7
has. A driver's seat 8 is arranged above the hydraulic system 6, and a floor cover 9 is provided between the driver's seat 8 and the hydraulic system 6, spanning the left and right rear wheel fenders 5. The floor cover 9 is provided with a rear cover 10 that covers the driver's seat 8 from behind.
Reference numeral 11 denotes a three-point link mechanism for attaching a working machine such as a rotary to the rear of the tractor body 1.
2 and a pair of left and right lower links 13, each of which is connected to each lift arm 7 via a lift rod 14. Of the pair of left and right lift rods 14, one lift rod is constituted by a double-acting hydraulic cylinder 15. 16
is a hydraulic control lever that operates a control valve (not shown) of the hydraulic device 6, and is supported around a lever shaft 17 so as to be swingable back and forth.This hydraulic control lever 16 is connected to a guide groove formed in the floor cover 9 You will be guided along 18. A guide groove 20 for a stopper 19 is formed on the side of the guide groove 18, as shown in FIG. The stopper 19 is for regulating the operating range of the hydraulic control lever 16, and can be freely changed in position and fixed along the guide groove 20 with a butterfly bolt 21 or the like. Reference numeral 22 denotes a control valve for controlling the expansion and contraction of the hydraulic cylinder 15, and is attached to the mounting plate 23 by a nut 24 welded to the mounting plate 23 and a bolt 25 screwed into this.
3 is attached to the rear wheel fender 5 with bolts and nuts 26 so that the control valve 22 is located on the inside of the lower part of the rear wheel fender 5 on the side of the driver's seat 8 and below the floor cover 9. Further, a reinforcing bracket 27, which is fastened together with the brake case 3 and the rear axle case 4, is attached to the inside of the lower part of the control valve 22, thereby reinforcing the control valve 22. The reinforcing bracket 27 is jointly fastened to the control valve 22 by a bolt 25 at the lower end. The control valve 22 has a lever 29 that rotates around a lever shaft 28, and this lever 29 is curved in a U-shape and protrudes upward so as not to interfere with the hydraulic control lever 16. guide groove 2
0 and protrudes upward. Reference numeral 30 denotes an operating lever for operating the control valve 22, which is swingable back and forth by a support bracket 31 fixed to the floor cover 9 on the side of the driver's seat 8 and behind the guide grooves 18, 20 by means of a support shaft 32. This operating lever 30 is connected to the lever 29 via a rod 33 at the lower end.
is linked to. The operating lever 30 is arranged near the side of the driver's seat 8 behind the hydraulic control lever 16 and out of its operating range.
The control valve 22 is connected via a pipe 35 to a hydraulic pressure outlet 34 attached to one side of the hydraulic device 6, as shown in FIG.
6 to the control valve of the hydraulic device 6, and is fastened together with a safety valve 38.

Next, the effect will be explained. When tilting the work implement attached via the three-point linkage mechanism 11 to the left and right with respect to the tractor body 1, move the operating lever 30 to the support shaft 3.
Swing around 2 as shown in the imaginary line. Then, the lever 29 swings back and forth in the guide groove 20 via the rod 33, the control valve 22 is switched via the lever shaft 28, and the hydraulic cylinder 15 expands and contracts in accordance with the operation of the operating lever 30, so that the Point link mechanism 11
The height of the pair of left and right lower links 13 changes, and the work machine tilts left and right. In this case, the operator can operate the control lever 30 while sitting in the driver's seat 8, and the operability is very good. Furthermore, by taking a half-body posture facing backwards, it is possible to easily check the state of change in the posture of the working machine at that time, and it is possible to easily control the posture of the working machine even while traveling.

Although the lever 29 is inserted into the guide groove 20, there is no problem when using the stopper 19. In other words, the stopper 19 is used to keep the operating position constant when the hydraulic control lever 16 is operated in the downward direction.
In contrast, since the lever 29 moves on the rear side of the guide groove 20, the lever 29 does not interfere with the stopper 19. Further, since the lever 29 is curved in a U-shape to avoid interference with the hydraulic control lever 16, these levers can be arranged together in the side area of the driver's seat 8. Since the control valve 22 is installed inside the lower part of the rear wheel fender 5, it is not subject to space constraints, and since there is a mounting plate 23 on the outside thereof, it is sufficiently protected from mud, etc. attached to the rear wheel. Can be protected. Moreover, the control valve 22 is not only attached to the rear wheel fender 5 via the mounting plate 23 but also attached to the reinforcing bracket 2.
7, the structure can sufficiently withstand vibrations.

Note that the pair of left and right lift rods 14 may both be constructed of hydraulic cylinders 15.

In this invention, the operating lever of the control valve is placed near the side of the driver's seat, so the attitude of the work equipment can be controlled by operating the operating lever while sitting in the driver's seat, compared to conventional methods. This significantly improves operability. Also, the attitude of the work equipment can be easily checked.
Moreover, the operating lever is located behind the hydraulic control lever in the longitudinal direction and outside its operating range, so it does not interfere with the operation of the hydraulic control lever even though it is located near the side of the driver's seat. . Furthermore, since the operating frequency of the operating lever itself is extremely low compared to the hydraulic control lever, it is sufficient to operate the operating lever even if it is located behind the hydraulic control lever. Furthermore, the control valve is located inside the lower part of the rear wheel fender, to the side of the driver's seat and below the floor cover, so the mechanism attached to the control valve is exposed on the floor cover and becomes complicated. There is no space limitation, and there is a great degree of freedom in design.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway side view, Fig. 2 is a longitudinal rear view, Fig. 3 is a plan view of the main parts, and Fig. 4 is a configuration diagram of the hydraulic system. be. 1... Tractor body, 2... Mission case, 5... Rear wheel fender, 6... Hydraulic system, 8
...Driver's seat, 11...Three-point linkage mechanism, 13...
Lower link, 14...Lift rod, 15...Hydraulic cylinder, 22...Control valve, 23...Mounting plate,
29...Lever, 30...Operation lever.

Claims (1)

[Scope of utility model registration request] A floor cover 9 is provided between the left and right rear wheel fenders 5 so as to cover the hydraulic system 6 on the tractor body 1, and a driver's seat 8 is placed on the floor cover 9. A hydraulic control lever 16 for the hydraulic device 6 is provided between the wheel fender 5 and the hydraulic control lever 16 for the hydraulic device 6 to be freely operated back and forth, and a pair of left and right lift arms 7 of the hydraulic device 6 and a pair of left and right lower links 13 of the three-point linkage mechanism 11 are connected. Lift rods 1 connected to each other
4, the control valve 22 for controlling the expansion and contraction of the hydraulic cylinder 15 is installed on the rear wheel fender 5 on the side of the driver's seat 8 and below the floor cover 9. The operating lever 30 of the control valve 22 is provided near the side of the driver's seat 8 at the rear side of the hydraulic control lever 16 in the longitudinal direction and out of the operating range of the hydraulic control lever 16. A posture control device for a working machine in a tractor, characterized in that: