JPH052964Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rear two-wheel holder in a tractor tiller, and is used to set the plowing depth.

(Prior art) The front ends of a pair of left and right support pipes are connected to the machine frame of a tiller connected to a tractor as a holder for two rear wheels of a tractor tiller, allowing vertical movement. are connected to each other by horizontal rods to form a substantially H-shape in plan view, and have two rear wheels at both left and right ends, and a tail wheel support having a hitch fitting at the center in the left and right direction, each nested in the support pipe. A device that has an insertion rod that slides in the longitudinal direction of the pipe and has a lock pin that allows the insertion rod inserted into the support pipe to expand and contract is proposed in Japanese Utility Model Application Publication No. 53-13501.

(Problem to be solved by the invention) By the way, in the conventional example, the support pipe is a drawn steel pipe, an extruded steel pipe, etc., and when the insertion rod of the tail wheel support body is telescopically fitted to this, the support pipe is Due to the unstable wall diameter of the pipe, the fitting part (insertion port)
There was a large gap, which together with backlash was a cause of noise.

As a result, the rim of the socket quickly expands and cracks, resulting in poor durability.To prevent this, it is necessary to separately weld a strip around the outside of the socket, making the structure complex. Ta.

The present invention aims to solve the problems of the prior art by simple means.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by a pair of right and left support pipes connected to the power tiller 1 and the machine frame 5 connected to the tokurata. The front end of 15 is connected to 16 so as to be movable up and down,
The left and right pair of support pipes 15 are connected to each other by horizontal rods 17.
A tail wheel support body 20 is connected to form a substantially H-shape in plan view, and has two rear wheels 24 at both left and right ends, and a hitch fitting 26 at the center in the left and right direction.
Each of the support pipes 15 has an insertion rod 22 that slides in the longitudinal direction of the pipe as a nested structure, and the insertion rod 22 inserted into the support pipe 15
In the device having a lock pin 34 that allows the insertion rod 22 to be freely expanded and fixed, each insertion port 27 of the support pipe 15 into which the insertion rod 22 is inserted is drawn so that its inner diameter approximately matches the outer diameter of the insertion rod 22. Furthermore, the pipe wall thickness t at the insertion port 27 is made thicker than the wall thickness t1 of the support pipe 15, and the pin insertion hole 3 through which the lock pin 34 is inserted is provided in the insertion port 27.
2 are formed in the support pipe 15, and pin insertion holes 28, 29, 3 other than the pin insertion hole 32 are formed in the support pipe 15.
A plurality of pin insertion holes 2 are formed in the insertion rod 22 at intervals in the longitudinal direction of the pipe.
8, 29, 30, 31, and 32 are provided with receiving holes 33 for locking pins 34 inserted therethrough.

(Function) The insertion rod 22 is fitted into the insertion port 27 of the support pipe 15, and is fixed in the front-rear direction (expansion/contraction) by the lock pin 34.

When the insertion rod 22 is inserted into the support pipe 15 the deepest and the locking pin 34 is inserted into the first pin insertion hole 28 and the receiving hole 33 and fixed, the soil pot support rod is attached to the hit fitting 26 and used. .

Also, when the lock pin 34 is inserted into the second pin insertion hole 29 into the receiving hole 33, the rear cover 10
It is used by removing the notch closing cover 12 and placing a cultivator in the notch.

Furthermore, when the third pin insertion hole 30 and the receiving hole 33 are fixed with the lock pin 34, it is used for shallow plowing, and when the fourth pin insertion hole 31 and the receiving hole 33 are fixed with the lock pin 34, the rear cover 1
When used with the auxiliary covers 11 installed on the left and right sides of the 0, and when the 5th pin insertion hole 32 and the receiving hole 33 are fixed with the lock pin 34, the rear two wheels 24 are farthest from the tilling section 2, and the level control is not performed. It is used for cultivating the land.

Here, in each usage mode, the inner diameter of the insertion port 27 substantially matches the outer diameter of the insertion rod 22 to reduce backlash.

(Example) In FIGS. 3 and 4, reference numeral 1 denotes a tiller, which is connected to a tractor (not shown) by a three-point link or the like so as to be able to move up and down.

In the illustrated example, the tilling section 2 is exemplified as one that can be freely switched between forward and reverse directions.

Reference numeral 3 denotes a power receiving case, which is located at the upper part in the center in the left-right direction, from which a pair of left and right support arms 4 protrude outward to form a machine frame 5.

A side transmission case 6 is attached to the outer end of the support arm 4.
and a support plate 7 are installed below, and a tilling section 2 is provided below both.
The claw shaft is supported.

A cover device 8 covers the tilling section 2 and includes at least a fixed front cover 9 and a rear cover 10 connected to the fixed front cover 9 so as to be vertically movable.

The rear cover 10 has a removable auxiliary cover 11 that closes notches at the left and right ends, and has a mountain-shaped notch in the center, and a closing cover 12 that closes this is removably attached. It is equipped.

The rear cover 10 is biased in the direction of contact with the ground by a pair of left and right coil spring type elastic holding mechanisms 13, and the elastic force thereof can be adjusted in strength.

Reference numeral 14 designates a rear two-wheel holder according to the present invention, in which the front ends of a pair of left and right support pipes 15 are pivotally connected to the machine frame 5 by a connecting portion 16 using a pin so as to be vertically movable.

The support pipes 15 are connected to each other at the rear end side by a horizontal rod 17 made of pipe material and have a substantially H shape in plan. There is.

The tail wheel support 20 consists of a horizontal rod 21 and an insertion rod 22, and has a tail wheel 24 with a caster structure via a take-out shaft 23 at both left and right ends of the horizontal rod 21, and a rear wheel 24 with a caster structure. Hitchi metal fitting 2 with hole 25
6.

Here, the insertion rod 22 is inserted into the insertion port 27 of the support pipe 15, and both are slidable in the longitudinal direction of the pipe due to the nested structure.

As shown in FIGS. 1 and 2, the support pipe 15 made of a drawn or extruded steel pipe is formed by drawing each insertion port 27, and the inner diameter D of the insertion port 27 is as follows.
The outer shape D1 of the insertion rod 22 of the pipe structure substantially matches, and since the insertion port 27 is drawn, its wall thickness t is greater than the wall thickness t1 of the pipe material.

The insertion port 27 has a pin insertion hole 3 that penetrates in the radial direction.
2 is formed.

Furthermore, the support pipe 15 is provided with the pin insertion hole 32.
In this example, four holes are formed in the longitudinal direction of the pipe, and five pin insertion holes 28, 29, 30, and 31 are formed in the longitudinal direction of the pipe.
29, 30, 31, 32 are formed, and each hole 28-
32, and a receiving hole 3 formed at the front end of the insertion rod 22.
3, and by inserting a headed lock pin 34 into the lock pin 34, it can be expanded and contracted.

Note that the number of pin insertion holes 28 to 32 may be four, three, or two in addition to five.

(Effect of the invention) According to the invention, the insertion rod 22 is telescopically fitted into the pair of left and right support pipes 15, and the lock pin 34
In this case, the insertion port 27 of the support pipe 15 is drawn so that its inner diameter approximately matches the outer diameter of the insertion rod 22, so that play between the two can be minimized. Dimensional accuracy can be improved.

Further, since the insertion port 27 is drawn, its wall thickness t is larger than the pipe wall thickness t1, and therefore, there is no problem in forming the pin insertion hole 32 in the insertion port 27.

Therefore, according to the present invention, it is possible to provide a rear two-wheel holder that has good fitting accuracy, improved quality, produces less noise due to vibration, and can be used with various attachments without any problems.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the embodiment of the present invention showing the main parts of the support pipe and the insertion rod, Fig. 2 is an enlarged sectional view showing the structure of the insertion port, and Fig. 3 is a tiller equipped with the holder of the embodiment of the present invention. A side view of the machine, and FIG. 4 is a plan view thereof. 1... Cultivator, 5... Machine frame, 15... Support pipe, 16... Connection, 17... Horizontal rod, 20... Tail wheel support, 22... Insertion rod, 24... Rear two wheels, 26
...Hitsuchi metal fittings, 27...Insert, 28, 29,
30, 31, 32...Pin insertion hole, 33...Reception hole, 34...Lock pin, t...Pipe wall thickness.

Claims (1)

[Claims for Utility Model Registration] Front ends of a pair of left and right support pipes 15 are connected 16 to the cultivator 1 and machine frame 5 connected to the tokurata so as to be movable up and down.
5 are connected to each other by a horizontal rod 17 to form a substantially H shape in plan view, and a tail wheel support body 20 having two rear wheels 24 at both left and right ends and a hitch fitting 26 at the center in the left and right direction is connected to the support pipe. 15, each of which has an insertion rod 22 that slides in the longitudinal direction of the pipe as a nested structure, and has a lock pin 34 that allows the insertion rod 22 inserted into the support pipe 15 to be freely extended and fixed. Each insertion port 27 of the support pipe 15 to be inserted is drawn so that its inner diameter approximately matches the outer diameter of the insertion rod 22, and furthermore, the pipe wall thickness t at the insertion port 27 is equal to that of the support pipe. The pin insertion hole 3 is made thicker than the wall thickness t1 of 15, and the lock pin 34 is inserted into the insertion port 27.
2 are formed in the support pipe 15, and pin insertion holes 28, 29, 3 other than the pin insertion hole 32 are formed in the support pipe 15.
A plurality of pin insertion holes 2 are formed in the insertion rod 22 at intervals in the longitudinal direction of the pipe.
8, 29, 30, 31, and 32 are provided with a receiving hole 33 for a lock pin 34 inserted therethrough.