JPS6310642Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a sub-cover such as a front cover or a rear cover of a rotary tiller.

For example, a tilling cover device for a forward/reverse rotary tiller has a main cover fixed to the machine frame, and a front cover and a rear cover connected to the front and rear of the main cover so as to be rotatable around a horizontal axis. Sub-covers such as the cover and the rear cover are supported via a support mechanism to a fixed side consisting of the machine frame and the main cover.

In this support mechanism, a support arm protrudes from the fixed side and is pivoted to the sub cover so that the sub cover can be set at a required angle with respect to the main cover and the impact can be alleviated when the tilled soil clod collides with the sub cover. The connected rod is slidably and swingably supported on a support arm, and a spring is interposed between the support arm and the rod in a compressed state to press the rod downward and restrict its sliding downward from a desired position. is configured to do so.

In the conventional rear cover support mechanism, as shown in FIG. 1, a dedicated support arm 31 protrudes from the machine frame 4.
The rear end is formed into a fork, and a horizontal shaft 32 is attached to this fork.
is rotatably provided, and a rear cover 13 is attached to this horizontal shaft 32.
The rod 33 is slidably connected to the
A pair of upper and lower springs 34 and 35 are provided between the horizontal shaft 32 and the rod 33, and retaining pins 36 and 37 provided on the rod 33 prevent the springs from coming off. The upper and lower springs 34 and 35 are fitted into the rod 33 in a compressed state, and the lower spring 35 is attached to the rear cover 13.
The upper spring 34 is for buffering when the rear cover 13 is pushed upward by a collision with a clod, and the upper spring 34 is for buffering the return impulse.Both springs 34 and 35 are balanced and hold the rear cover 13 at a required angle, or It is designed to provide an equalizing pressure.

In such a conventional structure, the processing and assembly of the support arm 31 and the horizontal shaft 32 are complicated and expensive, and the U-shaped spring washer 38 is also required, resulting in a large number of parts. This method has problems such as being difficult to apply to a front cover where the mounting space is limited by the ring.

The present invention solves the problems of the conventional structure, ensures stable support, can be manufactured easily and inexpensively, and can be applied not only to the rear cover but also to the front cover, making it suitable as a secondary cover for rotary tillers. The purpose is to provide a supporting structure.

A feature of the present invention to achieve this purpose is that the main cover is fixed to the machine frame, and a sub cover is provided so as to be rotatable around a horizontal axis, and a sub cover is provided that protrudes from the fixed side that has the machine frame and the main cover. A rotary cultivator in which a support arm slidably and swingably supports a rod pivotally connected to a sub-cover, and a spring is provided between the support arm and the rod to buffer at least an upward impact applied to the sub-cover. In the sub-cover support structure, the support arm is provided with a support plate through which a rod passes, and a protruding arcuate contact surface is provided on the support plate side between the support plate and the spring. Another feature is that a rotatable washer is provided on the support plate.

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

1 to 3, 1 is a rotary tiller, which is towed by a tractor (not shown) via a top link 2 and a pair of left and right lower links 3, and 4 is a gear case 10, a support arm 5, A machine frame consisting of a transmission case 6 and the like supports a claw shaft 7 rotatably around a horizontal axis, and a large number of tilling claws 8 are provided on the claw shaft 7 to form an atsupakatsu type tilling section 9. .

11 is a tilling cover device which includes a main cover 12 that covers the upper part of the tilling section 9, a rear cover 13 that is pivotally connected to the rear part of the main cover 12, a front cover 14 that is pivotally connected to the front part of the main cover 12, and a main cover 12 that covers the upper part of the tilling section 9; It has a rear cover 15 that covers the left and right sides of the cover 12 and the rear cover 13, and a front cover 16 that covers the sides of the front cover 14, and the main cover 12 and the rear cover 15 are fixed to the machine frame 4. has been done.

Reference numeral 18 indicates rear gauge wheels which are provided on the left and right sides of the rear end of the support frame 20 and whose height can be adjusted by a height adjustment mechanism 19, respectively.

Reference numeral 21 denotes a pair of left and right lower link mounting brackets that protrude forward from the support arms 5 of the machine frame 4, and are located above both ends of the front cover 14 on the center side, and these brackets 21 can be used as support arms. A support mechanism 22 is provided between the front cover 14 and the front cover 14 .

A rod 23 has a lower end pin-connected to the upper surface of the front cover 14 via a bracket 24, and passes through a support plate 25 provided on the outer surface of the bracket 21 in a laterally projecting manner. A hole 25a slightly larger than the diameter of the rod 23 is formed in the support plate 25, so that the rod 23 can slide freely.

A spring 26 is provided between the rod 23 and the support plate 25 to press the rod 23 downward. The spring 26 is fitted into the rod 23, and is supported by washers 27 and 28 above and below.The lower washer 28 is positionally regulated by a beta pin 29a provided on the rod 23, and the upper washer 27 is supported. It is in contact with the lower surface of the plate 25.

The upper and lower washers 27 and 28 are formed into a bowl shape with a spherical surface, and are fitted into the rod 23 and engaged with the end of the spring 26. At least the upper washer 27 of the upper and lower washers 27 and 28 has a contact surface 27 that is arcuate in side view.
a, and this contact surface 27a rolls against the lower surface of the support plate 25 when the rod 23 swings relative to the support plate 25.

Therefore, when the front cover 14 moves from the imaginary line position in FIG.
3 swings, the upper washer 27 only rolls against the support plate 25, and the relationship between the spring 26 and the upper washer 27 remains unchanged, so the spring 26 is not compressed unevenly and the rod 23 can swing smoothly.

Reference numeral 29b is a beta pin provided on the rod 23 to prevent it from falling out from above.
A large number of holes 30a and 30b are provided at intervals for setting the lower beta pin 29a and the lower beta pin 29a, respectively.
The angle of the front cover 14 with respect to the main cover 12 can be adjusted by appropriately selecting the holes 30a and 30b into which the springs are inserted. The degree of compression can be adjusted.

In the above embodiment, since the support plate 25 is provided on the lower link mounting bracket 21, it can be manufactured at a very low cost.
It is also possible to separately provide a support arm protruding from the fixed side such as the second one, and provide the support plate 25 on the support arm.

FIG. 4 shows a modification of the present invention, in which this support mechanism 22' is provided with two sets of the arc-shaped washer 27 and spring 26 of the previous embodiment, upper and lower, by narrowing the support plate 25. A flat plate is used as the washer 28'.

In this way, the springs 2 are placed above and below the support plate 25.
By providing 6 and 26', the lower spring 2 absorbs the impact when the sub cover floats up due to a collision with a clod.
6, and the return impact when the rod 23 slides downward due to the restoring force of the lower spring 26 can be buffered by the upper spring 26'. That is, the functions of the upper and lower springs 26, 26' are the same as the conventional support mechanism for the rear cover 13 shown in FIG.
One support plate 25 and two arc-shaped washers 27, 2
7', the rod 23 can swing smoothly, and the upper and lower springs 26, 26' can be stably supported and stabilized.

This modification is particularly useful for the rear cover 13, and the above embodiment is particularly useful for the front cover 14, but the front and rear covers 1
Supports 3 and 14 may be configured with either one of the structures.

According to the present invention described in detail above, the washer for the spring fitted to the rod has an arcuate contact surface and can freely roll by contacting the support plate fixed to the support arm. The rod can be smoothly swung relative to the support plate when changing the angle of the sub-cover or when the sub-cover is pushed due to a collision with a clod.
Since the state in which the spring is pressed is constant, its acting force can be applied stably at all times, making it possible to stably support the sub-cover. Since it is not necessary, processing and assembly can be performed easily and at low cost.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is an overall side view of the present invention together with the conventional structure, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view of main parts. FIG. 4 is a sectional view showing a modification of the present invention. 1... Rotary tiller, 4... Machine frame, 12...
Main cover, 13...Rear cover, 14...Front cover, 21...Lower link mounting bracket, 22...
...Support mechanism, 23...Rod, 25...Support plate,
26... Spring, 27... Upper washer, 27a
...Abutting surface, 28...Lower washer.

Claims (1)

[Scope of utility model registration request] A sub-cover is provided to be rotatable around the horizontal axis with respect to the main cover fixed to the machine frame, and a rod pivotally connected to the sub-cover can be slid and swung by a support arm protruding from the fixed side that has the machine frame and the main cover. A sub-cover support structure for a rotary cultivator, which is movably supported and provided with a spring between the support arm and the rod to buffer at least an upward impact applied to the sub-cover, wherein the support arm is penetrated by a rod. A support plate is provided, and the support plate has a protruding arcuate contact surface on the support plate side between the support plate and the spring, and a rotatable washer is provided on the support plate. A sub-cover support structure for a rotary tiller.