JPH0535841Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a variable displacement wheel for agricultural use that allows the tread to be easily changed for use in agricultural machinery vehicles.

[Conventional technology]

Conventionally, in this type of wheel, as shown in FIGS. 5 and 6, the bracket 16 is moved radially outward by tightening the nut 8 screwed onto the bolt 15 using the inclined portion of the disc 14. The disk 14 is pushed out and comes into close contact with the guide rail 17.
was to be fixed. Note that 10 is a spring washer.

In addition, as shown in FIG. 7, the guide rail 18
It has also been devised that the disk 21 is fixed by sandwiching it between two brackets 19 and 20 and tightening the nut 8.

In all of these, when changing the tread, the nut is loosened and the disc is slid along the guide rail.

[Problem that the invention attempts to solve]

However, in all of the conventional examples mentioned above, when the tractor suddenly starts or stops, the fixed position may shift due to the large force acting on the tightening surfaces of the bracket and guide rail, and the nut may become loose if used repeatedly. There was a problem with the large amount.

[Means for solving problems]

The present invention was made to solve the above problems, and includes a plurality of guide rails provided at equal intervals on the inner peripheral surface of the rim, and provided on the disk.
A variable displacement wheel comprising a pair of brackets engaged with each of the guide rails, a sliding surface on which the brackets of the guide rails slide is provided with a plurality of recesses, and the brackets are engaged with the recesses. A roller is rotatably arranged between a pair of brackets, a recess is provided in the slide surface side of one of the brackets or the roller around the bolt hole, and the roller and the bracket are attached to the recess in the direction of separation. By arranging a biased elastic body, the bracket tightening nut does not loosen, the rim and the disk are firmly fixed, and the variable displacement wheel can be easily slid when adjusting the tread. .

[Effect]

With the above configuration, the bracket is reliably engaged and fixed in the recess provided in the sliding surface of the guide rail at a position where a predetermined tread is obtained.

Therefore, even if a large force is applied between the guide rail and the bracket during running, the bracket will not move and the nut will not loosen.

Furthermore, when adjusting the slide, when the bracket tightening bolt is loosened, the movable bracket is pushed out of the recess of the guide rail by the elastic force of the elastic body, allowing smooth sliding.

〔Example〕

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

Embodiment 1 As shown in FIGS. 1 and 2, reference numeral 1 denotes a rim, and a plurality of spiral guide rails 2 are fixed to the inner circumferential surface of the rim at equal intervals. 4 and 5 are a pair of brackets; 4 is a fixed bracket that is welded to the disk 3; and 5 is a movable bracket that is not welded to the disk 3.

A plurality of recesses 6 having a width with which the movable bracket 5 can be engaged are provided on the sliding surface of the guide rail 2 on the movable bracket 5 side. The recess 6 may be provided at a position arbitrarily selected according to the tread.
The guide rail 2 may be processed before being formed into a spiral shape, or may be processed by hot forging.

As shown in FIG. 3, the depth d of the recess 6 is 1 to 6.
mm or so, and the corner portions R ₁ and R ₂ of the recess 6
It is preferable that the surface be approximately R0 to R6, but in some cases, it may be a C surface or a tapered surface. The movable bracket 5 is engaged with the recess 6 and fixed by tightening with the bolt 7 and nut 8.

As shown in FIG. 3, a roller 9 is disposed between the fixed bracket 4 and the movable bracket 5.
To facilitate sliding during tread adjustment.

The roller 9 is rotatably arranged through the bolt 7 so that its outer peripheral surface is in contact with the side surface of the guide rail 2.

Further, a recess 11 having a diameter 1 to 2 mm smaller than the outer diameter of the roller 9 is provided around the bolt hole on the sliding surface side of the movable bracket 5 with respect to the guide rail 2, and the roller 9 and the movable bracket 5 are inserted into the recess 11. A spring 12 biased in the direction of separating the bolts 7 is placed through the bolt 7.

Embodiment 2 In an agricultural variable displacement wheel constructed in the same manner as in Embodiment 1, as shown in FIG.
A recess 11 having a diameter 1 to 2 mm smaller than the outer diameter of the roller 9 is provided on the slide surface side of the bolt hole, and a spring biased in a direction to separate the roller 9 and the fixing bracket 4 is provided in the recess 11. 12 through the bolt 7, or as shown in FIG. The spring 12 biased toward is placed through the bolt hole 7.

By the way, the recess 13 of the roller 9 is the fourth
Although it is provided on the movable bracket 5 side in FIG. 9, it may be provided on the fixed bracket 4 side.

To explain how to use these embodiments, when adjusting the tread, when the agricultural machinery vehicle is moved forward or backward by loosening the bracket tightening nut 8, the movable bracket 5 is pulled out of the recess 6 of the guide rail 2 by the spring 12. The brackets 4 and 5 slide smoothly along the guide rail 2 due to the rotation of the rollers 9, and the vehicle is stopped at the predetermined tread position, and the bracket tightening nut 8 is tightened to move the movable bracket 5 to the guide rail 2. It is fixed by being engaged with the recess 6.

When sliding, the movable bracket 5 is moved by the spring 12.
Since the guide rail 2 is pushed out of the recess 6 by the elastic force of the guide rail 2, smooth sliding is possible.

By the way, although the spring 12 was used as the elastic body in each of the above embodiments, rubber may be used instead of the spring 12.

〔effect〕

By having the above-described structure of the present invention, it is possible to prevent bracket displacement and nut loosening, eliminate the need for additional tightening, and greatly improve quality reliability.

Furthermore, since the recessed portion of the guide rail serves as a mark for the tread adjustment position, selection and adjustment of the tread is easy.

Moreover, the elastic force of the elastic body widens the gap between the brackets, and has excellent practical effects such as smooth sliding during tread adjustment when moving the agricultural machinery vehicle forward or backward.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
Figure 2 is an explanatory diagram of the main parts of the wheel, Figure 2 is an exploded view of the rim and guide rail, Figure 3 is a partially cutaway sectional view showing the tightened state of the guide rail and bracket, Figure 4 A and B are the other parts, respectively. A partially cutaway sectional view showing the tightened state of the guide rail and bracket in the embodiment, FIGS. 5 and 6 show the conventional example, FIG. 5 is an explanatory diagram of the main part of the wheel, and FIG. FIG. 7 is a partially cutaway sectional view of the bracket tightening portion showing another conventional example. 1... Rim, 2, 17, 18... Guide rail, 3, 14, 21... Disk, 4... Fixed bracket, 5... Movable bracket, 6... Guide rail recess, 7, 15... Bolt, 8... Nut, 9, 22... Roller, 10... Spring washer, 11... Bracket recess, 12...
Spring, 13...Roller recess, 16, 19, 2
0...Bracket.

Claims (1)

[Scope of utility model registration request] It is composed of a plurality of helical guide rails provided on the inner peripheral surface of the rim at equal intervals, and a pair of brackets consisting of a fixed bracket and a movable bracket, which are provided on the disk and are engaged with the respective guide rails. A variable displacement wheel is provided with a plurality of recesses on the slide surface on which the brackets of the guide rail slide, and the brackets are engaged with the recesses, and a roller is rotatably arranged between the pair of brackets. , and a recess is provided in the slide surface side of one of the brackets or the roller around the bolt hole, and an elastic body biased in a direction to separate the roller and the bracket is arranged in the recess. Wheel.