JPH068651Y2 - Tail wheel support structure for tiller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a support structure for a tail wheel for setting deep plowing of a tiller.

[Prior art]

Generally, this type of tail wheel is constructed in a sheet metal-made split structure, for example, as shown in FIG. 3 (Jitsuko Sho-44-160).
No. 01) is known. This is because the center part of the side plate (2) of the tail wheel main body (11) made of sheet metal is drawn inward, and the housing part (7) for holding the seal material (6) and the housing for holding the bearing (5). The seal member (8) is formed between each of the housing parts (7) and (8) and the cylindrical boss (4) formed in the shaft hole (3) at the center of the side plate (2). 6) and bearings (5) are held, and the tail wheel (1) constructed in this manner is provided at the lower end of the tail wheel bracket (14) extended to the rear of the tiller. As shown in the figure, the bolt holes (15) of the tail wheel bracket (14) and the tubular boss (4)
The support shaft (9) is inserted into the through hole (16) and tightened with a nut.

[Problems to be solved by the invention]

However, the above-mentioned conventional structure is excellent in workability and maintainability because the seal material (6) can be rearwardly assembled in the axial direction, but the bearing (5) is provided at the center of the tail wheel (1). In order to form the housing parts (8) and (7) of the sealing material (6) and the sealing material (6), it is necessary to deep-draw the central part of the tail wheel body as described above, and as a result, the material at this part There is a drawback that the plate thickness is reduced and the strength is reduced.

The present invention was made by paying attention to the above situation,
It is an object of the present invention to provide a tail wheel support structure for a tiller that does not significantly reduce the strength of the center portion of the tail wheel, as well as being able to improve the assemblability.

[Means for solving problems]

That is, the characteristic configuration of the tail wheel support structure of the tiller according to the present invention is that the central portion of the side plate of the tail wheel body is bent outward to integrally form the housing portion for the sealing material,
The tubular member with the flange is welded and fixed to the inner surface of the central portion of the side plate to form the housing portion for the bearing, and the action and effect thereof are as follows.

[Action]

As a housing part for holding the bearing and the sealing material fitted on the tubular boss from the outside, the central part of the side plate is bent outward to integrally form the housing part for the sealing material, and the inner surface of the central part of the side plate is formed. Since the tubular member with the flange is welded and fixed to form the housing portion for the bearing, while the sealing material and the bearing are held between the tubular boss and each housing portion, at the center portion of the tail wheel body, the side plate and It has a double structure in which the tubular member is overlapped and welded and fixed.

[Effect of device]

The strength of the central part of the side plate can be improved by the double structure part, and in this kind of tail wheel made of sheet metal,
It is now possible to provide a tail wheel with excellent strength and assembly.

Since the housing portion holding the sealing material is integrally formed on the outside of the side plate and the housing portion holding the bearing is formed by the tubular member with the flange inside the side plate, for example, the housing portion holding the sealing material is formed on the side plate. Compared to the case where the housing part for holding the bearing is integrally formed inside the side plate, the housing part integrally formed with the side plate is located outside the tail wheel. Muddy water does not enter through the gap between the flanged tubular member and the flanged tubular member, and it is possible to improve the sealing performance against waterproofing in the tail wheel body. No need to weld over,
Joining by spot welding is sufficient, workability can be improved, and the effect that welding distortion does not occur as in the case of welding over the entire circumference can be expected.

〔Example〕

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

FIG. 2 shows a walk-behind tiller (17). A rotary tiller (18) is connected to the rear of the walk-behind tiller (17), and the rotary tiller (18) is connected. ) The tail wheel (1) for setting the deep tillage of the early tiller (18) at the rear
Is rotatably supported via a tail wheel bracket (14).

Explaining the structure of the tail wheel (1), as shown in FIG. 1, the tail wheel (1) is made of sheet metal and has a left and right split structure, and a tail wheel body (11). 11) Both side plates
Cylindrical boss arranged in the shaft hole (3) formed in the center of (2)
(4), a pair of bearings (5) and a sealant (6) arranged between the tubular boss (4) and the tail wheel body (11).

The center portions of the both side plates (2), (2) are each drawn outward at a right angle over the entire circumference, and a housing portion (7) for holding a sealing material (6) is integrally formed, Side plate (2)
A cylindrical member (10) having a flange (21) projecting inward is fixed to the inner side surface of the central portion of the plate by spot welding at an appropriate position. A bent piece (22) is provided at the tip of the flange (21) of the tubular member (10) so as to protrude toward the center.

Then, the cylindrical boss arranged in the shaft hole (3) of the side plate (2).
The sealing material (6) fitted on (4) is the housing part of the one side.
The bearing (5), which is held by the outside (7) from the outside, is also held by the housing portion (8) formed inside the side plate (2), which is fitted on the cylindrical boss (4). The bent piece (22) contacts the inside of the bearing (5) and is positioned.

To assemble the tail wheel (1) thus constructed to the tail wheel bracket (14), the bolt hole (15) of the tail wheel bracket (14) and the through hole (16) of the tubular boss (4) are installed. It is supported by the tail wheel bracket (14) by passing the support shaft (9) inside the bracket.

Thus, according to the present invention, the tail wheel (1) is formed by inserting the support shaft (9) into the through hole (16) of the tubular boss (4) after the tail wheel (1) is manufactured. Since it can be attached to the tail wheel bracket (14), it can be easily assembled without rubbing the seal material (6) or damaging the seal material (6) when passing the support shaft (9). .

[Another embodiment]

The tail wheel (1) according to the present invention can be applied not only to the above-mentioned walk-type cultivator but also to a riding-type cultivator.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a tail wheel support structure for a tiller according to the present invention. FIG. 1 is a partially cutaway front view of the tail wheel portion, FIG. 2 is an overall side view of a walk-type tiller, and FIG. It is a partially broken front view of the Owa part of a prior art example. (1) …… tail wheel, (2) …… side plate, (3) …… shaft hole, (4) …… cylindrical boss, (5) …… bearing, (6) …… seal material, (7)… … Seal material housing, (8) …… Bearing housing, (9) …… Spindle, (10) …… Cylinder member.

Claims (1)

[Scope of utility model registration request] 1. A cylinder boss (4) is arranged in a shaft hole (3) formed in the center of a side plate (2) of a tail wheel (1), and is fitted onto the cylinder boss (4). Housing portions (7) and (8) for holding the bearing (5) and the sealing material (6) from the outside are provided in the central portions of the side plates (2), respectively, and the spindle (9) is provided in the tubular boss (4). In the tail wheel support structure of the tiller that has been inserted through, the central portion of the side plate (2) is bent outward to integrally form a housing portion (7) for the seal material (6), and A tail wheel support structure for a tiller, wherein a tubular member (10) with a flange is welded and fixed to the inner surface of the center of the side plate (2) to form a housing part (8) for the bearing (5).