JPS5831448Y2 - Mobile agricultural machine wheel adjustment device - Google Patents

Description

[Detailed description of the invention] The present invention is designed to move the wheels up and down in order to change and adjust the height of the machine body from the ground in mobile agricultural machines such as rice transplanters. Relating to an interposed wheel adjustment device.

In this type of wheel adjustment device, the transmission case is vertically oscillated by the expansion and contraction operations in the axial direction of the cylinder shaft and the threaded shaft inserted therein and the threaded shaft inserted therein. Conventionally, in such devices, mud and water are sprinkled on the screw shaft, causing it to rust, and preventing the relative rotation of the two shafts from being inhibited. The exposed part of the shaft was covered with an outer cylinder.

According to this, it is possible to prevent mud and water from directly splashing on the screw shaft, but mud and water can seep in from the relatively movable gap between one end of the outer cylinder and the cylinder shaft. This cannot be prevented, and during long-term use, it is inevitable that the relative rotation of the two shafts will be hindered.

In view of these circumstances, the present invention aims to provide a wheel adjustment device for mobile agricultural machinery that can reliably prevent mud and water from entering the outer cylinder that covers the screw shaft over a long period of time. It is.

That is, in the wheel adjustment device for a mobile agricultural machine according to the present invention, one end of the outer cylinder that covers the exposed portion of the screw shaft is pivotally supported to the screw shaft or the cylinder shaft so that only relative rotation is possible, and the other end of the outer cylinder is The periphery is bent outward to form a flange, and an elastic seal having a lip that slides into contact with the outer peripheral surface of the cylindrical shaft or screw shaft is fitted into the flange.

In other words, since the other end of the outer cylinder is provided with an elastic seal having a lip that slides against the outer peripheral surface of the cylinder shaft or screw shaft, this elastic seal prevents mud and water from seeping into the inside of the outer cylinder. It is possible to reliably prevent this from happening.

In addition, rather than making an elastic seal and sliding the entire seal against the cylindrical shaft or screw shaft, the lip is used for sliding contact, so the frictional force that prevents expansion and contraction of both shafts is small, allowing for relatively smooth expansion and contraction of both shafts. At the same time, the wear of the elastic seal itself can be reduced.

Furthermore, this elastic seal is fitted into a flange portion formed by bending the other end periphery of the outer cylinder outward, and the fitting area between the two is large, so that this fitting is performed strongly. Therefore, even if a frictional force in the axial direction is applied to the elastic seal due to the relative axial movement between this elastic seal and the cylindrical shaft or screw shaft due to the expansion and contraction of the two shafts, this frictional force will not exceed the above-mentioned effect. Combined with its small size, it is possible to reliably prevent the elastic seal from separating from the flange portion.

Moreover, the one end side of the outer cylinder is held so as to be able to rotate relative to the screw shaft or the cylindrical shaft, so that the elastic seal is not rotated according to the outer cylinder even when the two shafts are rotated relative to each other. Rigid even if rotated,
Since the rotation is not forced and the rotational force is small, the elastic seal does not receive any frictional force in the circumferential direction from the cylindrical shaft or screw shaft (even if it does, it is extremely small), so the elastic seal wears out. can be further reduced.

As a result of the above synergy, it has been possible to reliably and effectively prevent mud and water from entering the outer cylinder over a long period of time, and it has become possible to expect smooth wheel lifting and lowering operations.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 shows the entire rice transplanter, with drive wheels 2 mounted on the lower end of a transmission case 1 which is pivotally supported on the machine frame via a horizontal axis X so as to be able to swing up and down.
are mounted on a linked/moving shaft, and a seedling resting stand 3 is installed obliquely from the lower rear to the upper front while covering the rear of the wheels 2, and is configured to be able to slide back and forth from side to side. A seedling planting device 4 is disposed behind the seedling platform 3, and the seedling planting device 4 moves vertically in a circular motion on the mud surface from the seedling outlet at the bottom end of the seedling platform 3. is mounted on the front part of the machine frame and is interlocked and connected to the mounted engine 5 via a suitable transmission mechanism.

6 is a float, which is connected to the machine frame at both ends in the longitudinal direction so as to be able to swing vertically.

A link 9 can rotate relative to the upper end of the arm 7 protruding from the upper surface of the upper end of the transmission case 1 and the upper end of the swinging arm 8 whose intermediate portion is swingably supported on the machine frame. The lower end of the swinging arm 8 and a rotary handle 11 for lifting and lowering the wheel provided below the control handle 10 are connected to each other via a universal joint 12 and an adjustment device A, which is the main part of the present invention. It is linked and pivoted.

That is, the free end side of the cylindrical shaft 13, which is pivotally connected to the lower end of the swing arm 8 via the pivot portion 13a, is configured to have a small diameter, and the female thread formed on the inner surface of this small diameter portion has the above-mentioned thread. : A screw shaft 1 that extends from the hand 12 and is swingably supported on the machine frame via a pivot portion 14a at the intermediate portion in the longitudinal direction.
4 are inserted and screwed together, and both shafts 13 and 14 are expanded and contracted in their axial directions by relative rotation of the i , the transmission case 1 is swung through the swiveling arm 8, the link 9, and the arm 7, and the wheels 2 are raised and lowered.

The portion of the male threaded portion 14A on the tip side from the pivot portion 14a of the screw shaft 14 exposed from the cylinder shaft 13 (both shafts 13.1
The outer cylinder 15 that covers the outer cylinder 15 (the exposed length of which changes with the expansion and contraction of the screw shaft 14) is formed at its end portion relative to the periphery/groove 14b formed in the vicinity of the pivot portion 14a of the screw shaft 14. The cylinder shaft 13 is pivotally supported and fitted so that only rotation is possible, and the other end extends to the middle part in the length direction of the large diameter part of the cylinder shaft 13, and the outer periphery of a part of the free end side of the cylinder shaft 13 extends. The area is also covered.

The periphery of the other end of the outer cylinder 15 is formed into a flange portion 15a' bent outward as shown in FIG.
A rubber elastic seal 16 having a lip 16a that makes sliding contact with the outer circumferential surface of the cylinder shaft 13 is fitted and held on this flange portion 15a over a large area.

By rotating the screw shaft 14, the cylindrical shaft 13 is pushed out or pulled along the axial direction without rotating, and both shafts 13, 14 are moved.
Although the overall length is changed, at this time the outer cylinder 15 is not rotated by the rotation of the screw shaft 14, and therefore the lip of the elastic seal 16 fitted to the other end flange 15a 16a also only slides relative to the outer circumferential surface of the cylinder shaft 13 in the axial direction without relative sliding in the circumferential direction, and this relative sliding in the axial direction is as follows.
Since it is applied to a portion of the tip of the lip 16a, the frictional force applied to the lip 16□a is small, and the flange portion 1
The pressure or tensile force applied to the elastic seal 16 at the fitting part with the outer cylinder 15 is small. Water is reliably prevented from seeping into the outer cylinder 15.

: ・In addition, on the upper side, one end of the outer cylinder 15 is pivotally held so that only relative rotation is possible with respect to the screw shaft 14, and the lips 16a and ′ of the seal 16 fitted on the other end are attached to the outer circumferential surface of the cylinder shaft 13. However, conversely, one end of the outer cylinder 15 is brought into sliding contact with the cylinder shaft 13.
The lip 16a of the seal 16 is fitted onto the other end of the pivot portion 14a on the outer peripheral surface of the threaded shaft 14, preferably where no male thread is formed. It is also possible to make sliding contact with a portion located closer to the universal joint 12 than the other side.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings illustrate an embodiment of the wheel adjustment device for mobile agricultural machinery according to the present invention. FIG. 3 is an enlarged vertical sectional side view of the main part. 1...Wheel transmission case, 13...Cylinder shaft, 14...Screw shaft, 15...Outer cylinder, 1
5a...Flange portion, 16...Elastic seal, 16a...Lip.

Claims (1)

[Scope of utility model registration request] The wheel transmission case 1 is configured to be adjusted up and down by an expansion and contraction operation in the axial direction due to the relative rotation between the cylindrical shaft 13 and a threaded shaft 14 inserted and screwed therein, and the exposed portion of the threaded shaft 14 is One end side of the covering outer cylinder 15 is connected to the screw shaft 14 or cylinder shaft 13.
The flange portion 15a is formed by bending the periphery of the other end of the outer cylinder 15 outward, and the outer periphery of the cylinder shaft 13 or the threaded shaft 14 is attached to the flange portion 15a. A wheel adjustment device for a mobile agricultural machine, characterized in that an elastic seal 16 having a lip 16a that comes into sliding contact with a surface is fitted.