JPH031Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mast for attaching a hydraulic cylinder to a tractor.

A tractor usually has a hydraulic cylinder for raising and lowering a connected working machine.

By the way, this hydraulic cylinder is normally installed under the seat and above the transmission case, but due to the nature of this location, it is not possible to accommodate a very large hydraulic cylinder, and the lower link Since the position for connecting to the hydraulic cylinder is also poor, two to three links are installed between the rod of the hydraulic cylinder and the lower link, thereby connecting the two, and connecting the small stroke of the hydraulic cylinder to the lower link, that is, Adopts an increasing structure that converts the lifting rod into a larger stroke. Therefore, a hydraulic cylinder that can exert a large amount of force is required, and this has been achieved by using a hydraulic cylinder with a large diameter, but this has made the installation space even more cramped.

Furthermore, even if you try to lower the vehicle height of the tractor so that it is suitable for indoor work, etc., the installation space for this hydraulic cylinder at the above-mentioned position becomes a bottleneck.
I couldn't lower it as much as I wanted.

Therefore, this invention solves the above-mentioned problem by installing a mast obliquely at the rear of the tractor, attaching a hydraulic cylinder to the mast, and protruding the hydraulic cylinder from the above-mentioned position. The present invention provides a mast for attaching a hydraulic cylinder to a tractor, which effectively protects the hydraulic cylinder, etc., and also increases the rigidity of the mast itself.

Embodiments of this invention will be described below with reference to the drawings. In the accompanying drawings, Fig. 1 is a partially vertical cross-sectional side view of a tractor according to this invention, Fig. 2 is a rear view, and Fig. 3 is a mast. FIG. 4 is a vertical cross-sectional view of the portion, and FIG. 4 is a cross-sectional view taken from FIG.

The tractor has a machine body 1 with front wheels 2, 2 and rear wheels 3, 3.
The front part of the fuselage 1 serves as an engine loading part 4, to which a transmission 5 is connected and extends rearward.

The transmission 5 ends around the rear wheels 3, 3, from which the rear transmission cases 6, 6 are connected, and from the rear transmission cases 6, 6 the rear wheels 7, 7 are connected. It protrudes outward, and the rear wheels 3, 3 are fixed to it.

On the other hand, from the rear end of the mission 5, a mast 8 having a cross section is obliquely attached so that its upper end faces rearward and upward. Various methods can be considered for attaching the mast 8 to the transmission 5 at an angle. (it is necessary to make a hole 11, etc.), this part may be attached to the rear end surface of the mission 5, and fixed with a suitable fastener 12, etc.

By the way, a hydraulic cylinder 13 is housed inside this mast 8.

That is, in addition to having the head side of the hydraulic cylinder 13 facing downward and pivoting it to the mast 8 by the pin 14,
The lower end of the rod 15 is attached to the lower link 16,
The upper ends of the lifting rods 17, 17 linked to the rod 16 are pivotally connected. In addition, at the tip of the rod 15, there is a telescopic guide consisting of rollers 19, 19 that roll on the lower inner surfaces 18, 18 of the mast 8, and rollers 21 that also roll on the lateral inner surfaces 20, 20 of the mast 8. If the structure 22 is provided, the mast 8
The rod 15 expands and contracts smoothly within the shaft.

The expansion and contraction of the hydraulic cylinder 13 is controlled by an automatic or manual hydraulic controller 23, and this hydraulic controller 23 is mounted on a suitable mounting seat on the outer upper side of the mast 8 at a position close to the hydraulic cylinder 13. is formed in advance and fastened to this with bolts 24, etc. In addition,
This area is on the lower side of the seat 25, and is the place where the hydraulic cylinder is conventionally housed, but here the hydraulic cylinder 13 has been taken out to the outside, so this area is empty, and this area is designated as the box 26, as described above. In addition to the hydraulic controller 23, a battery 27 and the like are also accommodated.

Furthermore, it is necessary to detect the amount of expansion and contraction of the hydraulic cylinder 13 in order to operate the plowing depth control device and the position control device, and a detector (potentiometer) linked to the hydraulic cylinder 13 is used to detect this.
28, this detector 28
is provided inside the mast 8. That is, while the mounting legs 29, 29 of the detector 28 are fixed to the mast 8 in line with the hydraulic cylinder 13, the spool 30 is linked to the telescopic guide structure 22 at the tip of the rod 15 via a spring 31 or the like. .

Next, regarding the hit mechanism of the work machine, the lower links 16, 16 are connected by the fulcrums 32, 32, and
The upper link 33 also has brackets 35, 35 each provided on the mast 8 side by the fulcrum 34.
It is pivoted to the supporter 36.

In addition, near the mast 8, there is a fixing structure 37 for fixing the box 26, or a seat 25.
A small box 39 that also serves as an accessory case is provided as a mounting member for fixing the backrest 38 of the seat.
etc. are also attached to this mast.

As mentioned above, this idea is as follows.
That is, a mast 8 with its upper end facing rearward and upward is installed obliquely at the rear of the fuselage 1, and a lower link 16,
16 In a tractor equipped with a hydraulic unit such as a hydraulic cylinder 13 for lifting and lowering and a hydraulic controller 23, the hydraulic cylinder 13 and a detector 28 for detecting the amount of expansion and contraction of the hydraulic cylinder 13 are housed in the mast 8, and the Hydraulic controller 23 and adjacent parts of this mast 8, namely box 26 below seat 25, backrest 38
Since the small box 39 supporting the mast 8 is attached to the outside of the mast 8, the following effects can be expected.

First, since the hydraulic cylinder 13, the detector 28, etc. can be completely housed within the mast 8, the mast 8 serves as a protective member for effectively protecting them. and,
Since the hydraulic cylinder 13, the detector 28, and the hydraulic controller 23 can be installed close to each other inside and outside the mast 8 in this way, the piping and wiring can be arranged efficiently.

In addition, since the fixing structure 37 of the box 26 and the small box 39 are provided on the side of the mast 8, separate mounting structures for these are not required, reducing costs.
This has the advantage of increasing the strength of the mast 8 itself.

Furthermore, accommodating the hydraulic cylinder 13 in the mast 8, which is a vertically enclosed space, with a considerable distance from the upper wall, prevents the hydraulic cylinder 13 from going up and down against uplift from the work equipment side. Together with the presence of the bent structures 40, 40 interposed in the middle of the rods 17, 17, these will support the force,
This has excellent effects such as maintaining stable operation even with a lightweight rotary that easily lifts up.

[Brief explanation of drawings]

The drawings show an embodiment of this invention,
FIG. 1 is a partially longitudinal sectional side view of a tractor according to this invention, FIG. 2 is a rear view thereof, FIG. 3 is a vertical sectional view of a mast portion, and FIG. 4 is a sectional view taken from FIG. 3. Code, 1... fuselage, 8... mast, 13... hydraulic cylinder, 16... lower link, 23... hydraulic controller, 25... seat, 26... box, 28... detector, 38... backrest ,39...
...small box.

Claims (1)

[Scope of utility model registration request] A tractor in which a mast 8 with its upper end facing rearward and upward is installed obliquely at the rear of the body 1, and a hydraulic unit such as a hydraulic cylinder 13 for raising and lowering the lower links 16, 16 and a hydraulic controller 23 are attached to the mast 8. 13 and a detector 28 for detecting the amount of expansion and contraction of the hydraulic cylinder 13 is housed in the mast 8.
A mast for attaching a hydraulic cylinder to a tractor, characterized in that a small box 39 supporting adjacent members of the mast 8, that is, a box 26 below the seat 25 and a small box 39 supporting a backrest 38, is attached to the outside of the mast 8.