JPH0218967Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a sliding inner cylinder on the movable frame side fitted into the holding outer cylinder of a gearbox connected to the tractor body via a hitch so as to be movable from side to side. The present invention relates to a slide rotary tilling device configured to move a movable frame side to the left and right with respect to a gearbox side by expanding and contracting a hydraulic cylinder interposed therebetween.

As a prior art similar to the above-mentioned slide rotary tiller, there is one which is implemented in a walk-behind tiller, and is disclosed in, for example, Japanese Patent Publication No. 33-2801.

In the conventional model, the cylinder tube of the hydraulic cylinder and the oil passage for the control circuit were integrated into the traveling mission case of this machine, and the pistons that protruded left and right from the traveling mission case were used as movable frame members. It constitutes a mobile tillage device.

Therefore, when you remove the tillage device to work on the machine, or when you replace it with other work equipment, it becomes extremely troublesome to attach and detach it, and also because hydraulic cylinders, etc. are permanently installed in the travel transmission case of this machine. This makes the structure extremely complicated, increases the weight of the machine, and degrades the running performance when the tiller is not installed.Furthermore, when the tiller is installed, the piston is exposed. It also has the disadvantage that it is easily damaged because it is exposed.

The present invention was implemented in view of the actual state of the prior art as described above, and although it is a slide rotary tilling device that moves left and right by the operation of a hydraulic cylinder, it can be formed without complicating the tractor body side. It is easy to attach and detach from the machine, the hydraulic cylinder can operate safely without being damaged by external obstacles, and even though the tilling device itself is a slide rotary tilling device, the hydraulic pressure required for movement is low. The components are compactly assembled to ensure smooth and reliable operation.

That is, the present invention provides a slide rotary cultivating device in which a movable frame supported so as to be movable left and right relative to a gearbox can be moved left and right by the telescoping motion of a hydraulic cylinder interposed between the gearbox and the movable frame. The hydraulic cylinder is fixed to the gearbox side by sandwiching the oil passage plate, which is integrally connected to the inner end thereof, between the gear box and the inner end of the holding outer cylinder, and the oil passage plate is connected to the oil passage plate. The extending pipe-shaped body is externally fitted onto the hydraulic cylinder, and the gap created at the fitting part is formed into an oil passage communicating between the oil passage plate and one oil chamber of the hydraulic cylinder, and the outer surface of the pipe-shaped body is attached to the moving frame. The slide rotary cultivating device is characterized in that the piston rod is brought into contact with the inner surface of the slide inner cylinder on the side, and the tip of a piston rod located inside the slide inner cylinder and extending from the hydraulic cylinder is connected to the movable frame side. It is something.

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

FIG. 1 is a plan view of a slide rotary tiller R according to the present invention, and FIG. 2 is an enlarged sectional view of the main parts thereof.

7 in the figure is a gearbox, and holding outer cylinders 16 and 16' are connected to the left and right sides, respectively, and constitute a base frame that is attached to the tractor body side via a hitch. for,
An input shaft 22 that can be interlocked and connected to the PTO shaft of the tractor;
A tilling transmission mechanism is housed therein, including a gear 19 fitted to the shaft, a transmission shaft 20 fitted with a gear 18 meshing with the gear 19, and the like.

The base frame consisting of gearbox 7, etc. has a moving frame.
R′ is equipped so that it can move left and right,
The moving frame R' supports a rotary tilling shaft 23 by supporting plates 6 and a tilling transmission case arranged on the left and right sides, and connects the supporting plate and the transmission case with a connecting rod 21. Further, slide inner cylinders 17 are installed at the front upper part of the moving frame R' and project inwardly from the left and right sides, respectively, and each slide inner cylinder is connected to the aforementioned holding outer cylinder. 1
6, 16' so that it can be slidably attached to the base frame so as to be movable in the left and right direction.

The horizontal movement of the moving frame R' is configured to be forcedly operated by the operation of a hydraulic cylinder 1 interposed between the gearbox (base frame) side and the moving frame side. This invention is installed with the following configuration.

The hydraulic cylinder 1 has an oil passage plate 10 for configuring a hydraulic control circuit integrally connected to the inner end of the cylinder tube, and one of the oil passages 11 and 11' bored in the oil passage plate 10. The passage 11 is communicated with the oil chamber on one side of the piston 2, and the oil passage 11' on the other side is communicated with the oil chamber on one side of the piston 2.
is configured to communicate with the oil chamber on the other side of the piston 2 via a gap 13 and an oil hole 14 formed between the cylinder tube and a pipe-shaped body 12 provided on the outer periphery of the cylinder tube.

However, the hydraulic cylinder 1 is held by the holding outer cylinder 1.
The oil passage plate 10 is housed inside a slide inner cylinder 17 that is slidably fitted in the oil passage plates 10 and 6, 16'.
If fixedly attached to the side of gearbox 7, the second
As is clear from the figure and FIGS. 3 and 4, the cylinder axis is aligned with the axes of the holding outer cylinders 16, 16' and the slide inner cylinder 17, and the cylinder tube side is aligned with the gearbox. The tip of the piston rod 3, which is integrally connected and supported and extends from the cylinder tube, is moved by a pin 4 to a moving frame.
It is connected to the bracket 5 on the R' side so that the moving frame R side can be moved left and right as desired with respect to the gearbox 7 side by moving the piston rod forward and backward.

In addition, 25 is a valve forming a switching operation part of the hydraulic control circuit, and pipes 8, 8 connected to the port are connected to sockets 9, 9', respectively.
9' connects the oil passage plate 10 to the oil passages 11, 11', and also serves as a fixture for attaching and fixing the oil passage plate 10 to the gearbox 7.

Further, although not shown in the drawings, the tilling transmission mechanism unit that transmits power to the rotary tilling shaft 23 is connected to the movable frame.
It goes without saying that the structure is designed to be able to follow the movement of the R' side when it moves from side to side.

Other reference numerals 15 in the figure are the lid of the hydraulic cylinder;
Reference numeral 24 indicates a gauge wheel provided on the moving frame R'.

To explain the left and right movement of the moving frame of the slide rotary cultivator having such a configuration, when pressure oil is sent from the oil passage 11 to the cylinder oil chamber by switching the valve 25, it is moved by the extension movement of the piston rod 3. The moving frame R' is pushed to the right in the figure and moved to the right with respect to the gearbox 7, and by switching the valve 25, other cylinder oil is removed from the oil passage 11', the gap 13, and the oil hole 14. When pressurized oil is sent into the chamber, the piston rod 3 is retracted and the moving frame R' is repositioned to the left in the figure, and when the valve 25 is kept in the neutral position, the moving frame R' moves left and right. It does not move and stops at any position.

When the moving frame R' moves to the right or left side, the slide inner cylinder 17 extending from the moving frame R' side moves the holding outer cylinders 16, 1 on the gearbox 7 side.
6' so that they are fully overlapped, and both cylinders 17,
Since the moving frame R' is pressed and operated by the hydraulic cylinder 1 whose axis coincides with the axis of 16,
There is no twisting on the sliding surfaces, and the operation is extremely smooth and light.

As is clear from the above explanation, in the present invention, the slide inner cylinder on the movable frame side is fitted into the holding outer cylinder extended from the gearbox side so as to be movable left and right, and the slide inner cylinder on the movable frame side is fitted into the holding outer cylinder extending from the gearbox side, so that the slide inner cylinder on the movable frame side is movably inserted between the gearbox and the movable frame. In a slide rotary cultivating device in which a moving frame is moved from side to side with respect to a gearbox by extension and contraction of a hydraulic cylinder installed in the hydraulic cylinder, an oil path plate integrally connected to an inner end of the hydraulic cylinder is held with the gearbox. The hydraulic cylinder is fixed to the gearbox side by being sandwiched between the inner end of the outer cylinder and the pipe-shaped body extending from the oil passage plate is fitted onto the hydraulic cylinder to create a gap where the fitting part is formed. is formed into an oil passage that communicates between the oil passage plate and one oil chamber of the hydraulic cylinder, and the outer surface of the pipe-shaped body is brought into contact with the inner surface of the slide inner cylinder, and the pipe is located inside the slide inner cylinder and extends from the hydraulic cylinder. The tip of the piston rod that comes out is connected to the movable frame side, so although it is a slide rotary tiller that changes its position left and right by the operation of a hydraulic cylinder, it does not require a hydraulic cylinder for movement and an oil path plate that makes up the control circuit. are now installed together on the tilling device side, which eliminates the problem of complicating the traveling transmission case of the tractor body and making it troublesome to attach and detach the tilling device.
It has become possible to overcome the problems of the conventional method.

Moreover, the hydraulic cylinder and oil passage plate installed on the tilling device side are installed inside the mating part of the holding outer cylinder and slide inner cylinder, which are always kept in a covered state even when the moving frame moves left and right. Therefore, it is safe as it will not be damaged by external obstacles, and since the oil road plate is installed in the gearbox and also serves as the mounting and fixing part of the hydraulic cylinder, the hydraulic mechanism for movement in the tillage equipment can be compacted. The interior can be installed efficiently.

In addition, the pipe-shaped body extending from the oil passage plate is fitted onto the hydraulic cylinder, and the outer surface of the pipe-shaped body is brought into contact with the inner surface of the slide inner cylinder, so that the hydraulic cylinder is self-centering. Since it is supported and reinforced, the strength of the hydraulic cylinder is improved,
It has the advantage of smooth operation without twisting or unbalanced loads.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a slide rotary tiller according to the present invention, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a diagram showing an application example. FIG. 3 is a cross-sectional view similar to FIG. 3; 1... Hydraulic cylinder, 2... Piston, 3...
Piston rod, 7...Gearbox, 10...
Oil path plate, 11, 11'...Oil passage, 12...Pipe-shaped body, 13...Gap, 14...Oil hole, 16,1
6'...Holding outer cylinder, 17...Slide inner cylinder, R'...
...Moving frame.

Claims (1)

[Scope of utility model registration request] Holding outer cylinder 16 extending from the gearbox 7 side
A slide inner cylinder 17 on the moving frame R' side is fitted inside so as to be movable from side to side, and the moving frame is moved by the telescopic movement of the hydraulic cylinder 1 interposed between the gear box 7 and the moving frame R'.
In a slide rotary tiller that moves R′ left and right with respect to the gearbox 7 side, an oil path plate 10 is integrally connected to the inner end of the hydraulic cylinder 1.
is inserted between the gearbox 7 and the inner end of the holding outer cylinder 16 to fix the hydraulic cylinder 1 to the gearbox 7 side, and the pipe-shaped body 12 extending from the oil passage plate 10 is attached to the hydraulic cylinder 1. A gap 13 is formed at the fitting portion by fitting the pipe-shaped body 12 outwardly to form an oil passage communicating between the oil passage plate 10 and one oil chamber of the hydraulic cylinder 1.
A slide rotary tiller characterized in that the piston rod 3 is brought into contact with the inner surface of the piston rod 7, and the tip of the piston rod 3, which is located inside the slide inner cylinder 17 and extends from the hydraulic cylinder 1, is connected to the moving frame R' side. Device.