JPS6238490Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application This invention relates to a tail wheel lifting support device installed on the frame of mobile agricultural machinery such as a tiller, a carrier, a self-propelled threshing machine, and the like.

B. Prior art A typical tail wheel lifting support device as described above has a tail wheel support inner cylinder slidably fitted into a support outer cylinder installed on the frame of a mobile agricultural machine, and the tail wheel The support inner cylinder is slid in the vertical direction by the rotation of the adjustment screw body that is rotatably supported on the support outer cylinder side, and the height above the ground of the tail wheel held in the tail wheel support inner cylinder is changed and adjusted. However, in most cases, such devices are installed in locations where muddy water is likely to get wet, so it is necessary to prevent muddy water from entering the interior. As a conventional technique that takes such measures, for example, the one disclosed in Japanese Utility Model Publication No. 7851/1983 is known.

C. Problems to be solved by the invention By the way, in the above conventional technology, an elastic ring is interposed between the fitting surfaces of both cylinders at the lower end of the support outer cylinder into which the tail wheel support inner cylinder is slidably fitted. The lower part of the cylinder is sealed, and in the upper part of the cylinder, an elastic ring is fitted to the upper end of the tail wheel support inner cylinder that is fitted inside the outer support cylinder, and the elastic ring is brought into sliding contact with the inner surface of the outer cylinder. I'm trying to seal it.

Therefore, although this product prevents muddy water from entering the inside of the supporting outer cylinder from the lower part, water etc. can enter from above into the supporting outer cylinder above the elastic ring provided on the inner cylinder at the upper part. This cannot be prevented, and as a result, the adjustment screw body that extends and contracts between the upper end of the support outer cylinder and the elastic ring, and the female screw portion into which it is screwed, may become rusted.

In addition, in the conventional type, the flange provided on the adjustment screw body and the handle are configured so that they directly slide into contact with both the upper and lower surfaces of the upper cover at the upper end of the supporting outer cylinder, so there is a drawback that the rotation operation by the handle becomes difficult. .

Therefore, with the present invention, the adjustment screw shaft that moves upward and backward from the support inner cylinder as the adjustment is performed can be sealed to prevent rust, and the operating handle can be easily rotated. To provide a convenient tail wheel lifting/lowering support device in which the sealing structure at the top of the cylinder elastically plays the role of preventing rattling of the adjustment screw shaft, and can also be expected to have the secondary effect of preventing the generation of abnormal noise. This was carried out for the purpose of

D. Means for Solving the Problems In order to achieve the above object, the present invention adjusts the position of the tail wheel by vertically moving the support inner cylinder fitted into the support outer cylinder by rotating the adjusting screw body using the operating handle. In the tail wheel lifting support device, a pivot shaft is connected to the adjustment screw body above the collar part, and an O A ring is interposed, and a packing and a liner are interposed between the lower surface of the support part and the upper surface of the collar part, so that the upper surface of the liner located above slides on the lower surface of the support part, and The outer periphery of the packing is in contact with the inner circumferential surface of the supporting outer cylinder, and the operating handle attached to the upper end of the pivot shaft is provided with appropriate measures so that the lower surface of its base does not come into sliding contact with the upper surface of the supporting part. It is installed with a gap, and a regulating mechanism is provided that engages the operating handle and the support part.
The adjusting screw body is pulled up by the spring force of the mechanism so that the packing and the liner are brought into pressure contact between the above-mentioned surfaces, and an oil seal ring is interposed at the lower end of the supporting outer cylinder and the fitting surface with the supporting inner cylinder. This constitutes a tail wheel lifting and lowering support device.

Therefore, according to the present invention, in the upper part of the supporting outer cylinder, the fitting surface between the pivot shaft and the supporting part at the upper part of the supporting outer cylinder is sealed by an O-ring, and a packing is provided on the inner surface of the supporting outer cylinder. Moreover, since the packing and the liner superimposed on it are brought into close contact between the support part and the flange by the spring force of the regulating mechanism, it is certain that water etc. will not enter from the upper part of the support outer cylinder. This, combined with the sealing structure at the bottom of the supporting outer cylinder, allows the entire inner area of the supporting outer cylinder to be well sealed.
This makes it possible to reliably prevent the entire adjustment screw body from rusting.

The packing and liner sandwiched between the support part and the flange part are in contact with the lower surface of the support part, which is the fixed side, with the liner located on the upper part, and the upper surface of the support part and the lower surface of the base of the operating handle. Since the handle is designed to avoid sliding contact, the operating handle can be rotated easily.

Further, as mentioned above, the gasket in contact with the inner surface of the supporting outer cylinder elastically supports the adjusting screw body and prevents it from rattling, thereby eliminating the generation of abnormal noise.

F. Example Hereinafter, a specific example of the present invention will be described in detail based on the drawings.

FIG. 1 is a side view of the present invention applied to a tiller, which is one type of mobile agricultural machinery, and FIG. 2 is an enlarged cross-sectional side view of the main parts thereof.

R is a rotary tiller, which is connected to and attached to a running section (not shown) of a tiller.

Reference numeral 1 is a frame of a rotary tiller R, which extends rearward as appropriate, and a tail wheel lifting support device A is installed at the rear end, and the present invention devises this tail wheel lifting support device. .

In the embodiment diagram, a support outer cylinder is fixedly or detachably attached to the rear end of the frame 1, and a tail wheel support inner cylinder 3 is attached to the support outer cylinder from its lower end opening.
A support arm 5 for supporting the tail wheel 4 is attached to the lower end of the tail wheel support inner cylinder 3 so as to be able to slide therewith at least in the vertical direction. A screw assembly 6 is positioned in relation to the fitted upper end.

A threaded portion 7a of an adjusting screw body 7 is screwed into the threaded body 6, and a collar portion 8 and a pivot shaft 9 are integrally provided at an upper portion of the threaded body 6 that is connected to the threaded portion.

The pivot shaft 9 of the adjustment screw body 7 is rotatably fitted into the shaft support hole of the support part 10 installed at the upper end of the support outer cylinder 2. A packing 11 made of an elastic material is interposed between the upper surface 8a and the lower surface 10a of the support portion 10, a liner 12 is interposed above the packing, and an O-ring 13 is interposed on the fitting surface between the shaft support hole and the pivot shaft 9. Therefore, an operating handle 14 for rotating the adjusting screw body 7 is attached by a fixture 15 to a portion of the pivot shaft 9 that projects upwardly from the pivot hole.

When the operating handle 14 is attached, it is fixed so that there is an appropriate gap between the lower surface of the base and the upper surface of the support part as shown in the figure, and the operating handle is attached between the corresponding surfaces of the two. A regulating mechanism 17 is provided to prevent the adjusting screw body 7 from rotating unexpectedly, and the regulating mechanism 17 is fixed downward by a spring embedded in the operating handle 14 side, as in the conventional one. The ball is pressed against the upper surface of the support part.

Further, the upper surface of the liner 12 mentioned above is in sliding contact with the lower surface 10a of the collar, and the outer circumference of the packing 11 is in contact with the inner circumferential surface of the support outer cylinder 2.

Reference numeral 16 denotes an oil sealing ring for sealing the sliding contact between the inner surface of the lower end of the outer supporting cylinder and the outer circumferential surface of the tail wheel supporting inner cylinder;
8 is a control handle that constitutes the tiller running section; 1
Reference numeral 9 designates a speed change operation mechanism for the traveling section, 20 a tilling transmission case of the rotary tillage device R, 21 a tilling claw, 22 a tilling section cover, and 23 a mounting section for a working machine such as a ridge erector.

Next, to explain the operation of the device configured as described above, the tail wheel lifting device A is attached and the first
When positioned as shown in the figure, the tilling claws 21 of the rotary tilling device are raised and held in the inactive state.Then, in order to lower the rotary tilling device from this state to the working state, the operating handle must be moved. When the operating handle is rotated in this direction, the operating handle rotates the adjusting screw body 7 while rotating against the holding force of the regulating mechanism.
is rotated slightly at the contact surface with the liner 12.

As the threaded body 6 is moved upward by such rotation of the adjusting screw body 7, the tail wheel 4 changes its position relative to the ground, and the tilling claws 21 are relatively lowered to the operating position. It will be done. Conversely, when changing the tilling device to a non-operating state, by rotating the operating handle in the opposite direction, the rotation of the adjustment screw body is reversed, the tail wheel is lowered, and the tiller claws are moved upward. It is pulled up and becomes inactive.

G. Effect of the invention As is clear from the above explanation, in the present invention, the fitting surface between the pivot shaft and the upper part of the supporting outer cylinder is sealed by an O-ring, and the supporting outer cylinder is sealed with an O-ring. The outer periphery of the packing is in contact with the inner surface of the packing, and the packing and the liner superimposed on it are brought into close contact between the support part and the flange by the spring force of the regulating mechanism, so water etc. cannot enter from the top. In combination with the oil seal structure at the bottom of the supporting outer cylinder, the inside of the entire supporting outer cylinder can be accurately sealed, and the entire adjustment screw body and the like can be maintained in good operating condition for a long period of time.

Moreover, when the adjusting screw body is rotated, the upper surface of the liner contacts the flange, and the operating handle does not contact the upper surface of the flange, so that the operating handle can be rotated easily and is extremely easy to operate.

Furthermore, the packing whose peripheral edge is in contact with the inner circumferential surface of the supporting outer cylinder elastically supports the adjusting screw body and prevents it from rattling, thereby eliminating the generation of abnormal noise and making it suitable for use. It has a number of advantages.

[Brief explanation of the drawing]

Figure 1 is a side view of the tilling device when the present invention is applied to a tiller, which is one of the mobile agricultural machines.
The figure is an enlarged cross-sectional side view of the main part. A...Tail wheel lifting support device, R...Rotary tilling device, 1...Frame, 2...Support outer cylinder, 4...
...Tail wheel, 6...Screw assembly, 7...Adjustment screw body, 7a
...Screw part, 9...Pivot shaft, 8a...Top surface of flange,
10...Support part, 10a...Support lower surface, 11...
...Putskin, 12...Liner, 18...O ring, 16...Oil seal ring, 3...Tail wheel support inner cylinder,
14...Operation handle.

Claims (1)

[Scope of utility model registration request] The tail wheel support inner cylinder 3 is slidably fitted into the support outer cylinder 2 attached to the frame 1, and the pivot shaft 9 of the adjustment screw body 7 is rotatably attached to the support part 10 at the upper end of the outer cylinder 2. The inner cylinder 3 is supported by the inner cylinder 3 and rotates the adjustment screw body 7 using the operation handle 14 fixed to the pivot shaft 9.
In the tail wheel support device configured to adjust the height of the tail wheel by changing the position of the side in the vertical direction, the pivot shaft 9 is connected to the flange 8 provided on the adjustment screw body 7.
An O-ring 13 is interposed between the fitting surface of the pivot shaft 9 and the upper end support part 10 so as to extend upwardly across the upper end support part 10 and the lower surface 10a of the upper end support part 10 and the collar part 8. A gasket 11 and a liner 12 are interposed between the gasket 11 and the upper surface 8a. The liner 12 is located above and its upper surface is in sliding contact with the lower surface 10a. The operating handle 14 is arranged so as to be in contact with the inner circumferential surface, and furthermore, the operating handle 14 is attached to the upper end of the pivot shaft 9, and the operating handle 14 is attached with an appropriate gap so that the lower surface of its base does not come into sliding contact with the upper surface of the upper end support part 10. A regulating mechanism 17 is provided in engagement with the operating handle 14 and the upper end support part 10, and the adjusting screw body 7 is pulled up by the spring force of the mechanism, so that the gasket 11 and the liner 12 are aligned with the above-mentioned both surfaces 8.
A and 10a are pressed into contact with each other, and the fitting surface with the inner cylinder 3 at the lower end of the support outer cylinder 2 is tightly sealed with an oil seal ring 16. Device.