JPS5939844Y2 - Equal pressure adjustment structure of rear cover of tillage device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for adjusting the leveling pressure by vertically adjusting the rear cover of a rotary tiller.

-゛ ゛ □As shown in Fig. 1, the rotary tillage device 1 is attached to the rear of the tractor body 2 via a three-point linkage mechanism 3, and is used for leveling, leveling, and
Tilling claws 5 for the purpose of preventing scattering of soil or muddy water, etc. and crushing soil, etc.
An upper cover 6 and a rear cover 7 are provided above and at the rear.

The rear cover 7 is provided so as to be vertically adjustable, that is, to be angularly adjustable with respect to the upper cover so as to adjust the equalizing pressure.

In the conventional rear cover 7, two sets of rods 10 and a spring 11 are arranged between the rear end of the rear cover 7 and a bracket 9 attached to a support arm 8 extending from a bevel gear case of the rotary tiller 1. and rear cover 7
It is constructed so that the rear end can be freely adjusted in pressure.

In this conventional equalizing pressure adjustment structure of the rear cover 7, it is necessary to adjust the pressing force of two springs, which takes time and effort, and it is difficult to accurately match the adjustment amounts of the two spring forces. It is difficult to do so, and the appearance of the rear cover is not very attractive as it includes two sets of rods 10, springs 11, etc.

In view of the above conventional problems, the present invention connects the rear cover to the front cover via a torsion bar, and adjusts the angle of the link connected to the torsion bar with respect to the upper cover via an adjustment member. It is an object of the present invention to provide a structure for adjusting the equalizing pressure of the rear cover of a tilling device, which is configured to be able to adjust the equalizing pressure of the rear cover by changing the amount of twist of the torsion bar.

In this invention, the rear cover is rotatably connected to the rear end of the upper cover via a pair of left and right torsion bars that form a horizontal axis, and the vertical side ends of both torsion bars are fixed to both sides of the rear cover. At the same time, each inner end is fixed to one end of a link located approximately in the middle of the rear cover, and the other end of this link is placed between the upper cover and the torsion bar by changing the angle of the link with respect to the upper cover. It is characterized by being provided with an adjustment member for adjusting the amount.

In addition, the leveling pressure adjustment in this invention is performed by adjusting the angle of the rear cover with respect to the front cover with the rotary tiller lifted up, and also by adjusting the amount of twist of the torsion bar with the rear cover on the ground. This can be done by adjusting.

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

In Figures 2 and 3, 15.15 is the upper cover 6.
A pair of left and right concentric torsion bars serve as horizontal shafts that rotatably connect the rear end and the front end (upper end) of the rear cover 7, and each torsion bar 15 has a Spline portions 15a and 15b (joint portions) are formed, and the spline portion 15a serving as the outer end is inserted into and engaged with a hinge member 16 attached to the upper surface of the rear cover 7, and both are fixed.

17 is a hinge member fixed to the upper cover 6; 18 is a hinge member fixed to the rear cover 7;
5 is loosely fitted.

Incidentally, instead of providing the hinge members 16, 17, 18, a cylindrical hinge part that fits into the torsion bar 15 may be integrally formed at the connecting part of both force bars, and the spline part 15
a.

Instead of forming the pin 15b, a pin passing through the hinge member 16 and the torsion bar 15 in the radial direction may be inserted.

A notch 7a is formed in the center of the front end of the rear cover 7, and links 20 are connected to both spline portions 15b, which are the inner ends of the torsion bars that protrude into the notch 7a.
are engaged and fixed, and both links 20 are connected by a pin 21.

Instead of providing two links 20, it is possible to use one link as shown in FIG.

Reference numeral 19 denotes a jacket for protecting the torsion bar 15 and improving the appearance of the joint between the two force bars.

Reference numeral 23 denotes a rod-shaped adjustment member, one end of which is pivotally supported by the pin 21, and a plurality of engaging portions 24 and pin insertion holes 25 are formed along the longitudinal direction.

This adjustment member 23 is provided between the end of the link 20 and the upper cover 6, and the adjustment member 23 is provided between the end of the link 20 and the upper cover 6.
0 angle can be changed, and by changing the angle of the link 20, the amount of twist of the torsion bar 15 changes.

A bifurcated bracket 27 that locks the adjustment member 23 is provided on the upper surface of the upper cover 6.
7 is provided with a fixed member such as a pin 28 and a removable pin 29.

The pin 28 is for hooking the engaging portion 24 of the adjusting member 23, and may be a projection protruding into the bifurcated interior of the bracket 27.

By changing the pin engaging portion 24 that engages with the pin 28, the angle (vertical position) of the rear cover 7 relative to the upper cover 6 while not in contact with the tilled soil changes.

When the rear cover 7 is grounded on tilled soil, the torsion bar 1
5 is in a slightly twisted state, and the repulsive force of this torsion bar 15 applies a leveling pressure to the rear cover 7 to press the surface of the tilled soil.

That is, by adjusting the vertical position of the adjusting member 23, the amount of twisting of the torsion bar 15 changes, and the equalizing pressure of the rear cover 7 is adjusted.

When changing the average pressure with the rear cover 7 in contact with the ground,
The adjustment member 23 is moved to directly change the total amount of twist of the torsion bar 15.

The pin 29 is used to fix the set adjustment member 23 to the bracket 27 by engaging the required pin engaging portion 24 with the pin 28, and passes through the bracket 27 and the pin insertion hole 25.

FIG. 4 shows a modification of the adjustment member, in which the pin engaging portion 2
A turnbuckle member 41 is provided at one end of a member 40 having a pin insertion hole 25 and a turnbuckle member 41, and by rotating the buckle 42, the distance between the pins 21 and 29 (as a result, the equalizing pressure) can be slightly reduced. Can be adjusted.

In the equalizing pressure adjustment structure of the rear cover configured as described above, the vertical position of the rear cover 7 can be adjusted by simply removing the pin 29 and changing the pin engaging portion 24 that engages with the pin 28. This changes the amount of twist of the torsion bar 15 when the rear cover 7 is in contact with tilled soil, thereby making it possible to adjust the leveling pressure.

Further, since only one pair of adjustment member 23 and bracket 27 are provided at the center of the double force bar, the structure is simple and the appearance is good.

Furthermore, by removing the pin 29, any pin engaging portion 2
4 can be engaged with the pin 28, the rear cover 7 can be quickly moved from the leveling position to the position where only crushing is performed.

5 and 6 show alternative configurations of the adjustment member 23 and the bracket 27, 31 is a hydraulic cylinder that can be operated by the hydraulic system of the tractor, and the cylinder rod 32 of this hydraulic cylinder 31 is connected via a link 33. link 34
It is connected to the pin 21 of.

The cylinder rod 32 and the link 33 are connected by a pin, but since the link 33 and the link 34 have an angle as shown in FIG. rotates around the torsion bar 15 and twists the torsion bar 15.

Note that the hydraulic cylinder 31 may be provided with a dedicated hydraulic pump 36 and a switching valve 37.

By adjusting the amount of protrusion of the cylinder rod 32 of the hydraulic cylinder 31, the amount of twist of the torsion bar 15 is adjusted via the links 33, 34, and the equalizing pressure of the rear cover 7 is adjusted.

That is, the cylinder rod 32 is connected to the upper cover 6 and the link 33.
．． By adjusting the position of this adjustment member, the angle of the link 33 with respect to the upper cover 6 can be changed, and the amount of twist of the torsion bar 15 can be changed.

The equalizing pressure adjusting structure shown in FIGS. 5 and 6 provides the same effects as those of the above-mentioned embodiment, and can be configured so that it can be operated while riding on a tractor.

According to the present invention described in detail above, the rear cover is connected to the upper cover via a pair of left and right torsion bars, and a link placed approximately in the center of the rear cover is fixed to each inner end of the left and right torsion bars. The twist amount of the torsion bar can be adjusted by adjusting the angle of the link with respect to the upper cover via the adjustment member, so it is extremely easy to adjust the equalization pressure of the rear cover, and the equalization pressure on the left and right sides can be adjusted. The amount of adjustment can be made to match accurately, and the configuration is simple and can be manufactured easily and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a side explanatory view showing a conventional rear cover equalizing pressure adjustment structure, FIGS. 2 and 3 are rear cover equalizing pressure adjusting structures of the present invention, and FIG. 2 is a perspective view. , FIG. 3 is an explanatory plan view, FIG. 4 is a side view showing a modified example of the adjustment member, FIGS. 5 and 6 show alternative configurations of the adjustment member and the bracket, and FIG. 5 is a perspective view. FIG. 6 is an explanatory plan view. DESCRIPTION OF SYMBOLS 1... Rotary tillage device, 6... Upper cover 7... Rear cover, 15... Torsion bar, 15a. 15b...Spline part, 16.17.18.
...Hinge member, 20...Link, 23.
...Adjustment member, 24...Engagement portion, 25.
...Pin insertion hole, 27...Bracket,
28.29...Pin.

Claims (1)

[Claims for Utility Model Registration] The rear cover is rotatably connected to the rear end of the upper cover via a pair of left and right torsion bars that form a horizontal axis, and each outer end of the torsion bars is connected to the rear cover. At the same time, each inner end is fixed to one end of the link located approximately in the middle of the rear cover, and the angle of the link with respect to the upper cover is changed between the other end of the link and the upper cover. An equalizing pressure adjustment structure for a rear cover of a tillage device, characterized in that an adjustment member force i is provided for adjusting the amount of twist of a torsion bar. □