JPH01128703A - Pressure-regulation apparatus for rear cover - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure adjustment device for a rear cover of a rotary tiller.

[Prior art and its problems] A rear cover that covers the rear of the tilling part of a rotary tiller is
It is rotatably attached to the rear of the main cover, and its lower edge makes sliding contact with the ground to level the ground surface. Conventionally, various methods have been used to change and adjust the pressure force of this rear cover on the ground surface. A through hole or groove is provided in which a pin, etc. can be locked, the lower end of the spring is held down by a collar, the position of the collar is moved in the vertical direction, and the pressing force of the spring is reduced by engaging the pin under the collar. It was a form of adjustment.

However, such a structure requires processing of holes in the solid rod and cutting of grooves in place of the holes, which not only requires a large number of processing steps but also increases production costs due to the increased weight. However, there was a drawback that it was difficult to manufacture the six pressurizing devices at a low cost.

[Means for solving intervening vertices] This invention is proposed in view of the above drawbacks, and includes:
It is an object of the present invention to obtain a pressure adjustment device for a rotary tiller that is inexpensive and can be put to practical use.

For this reason, the following technical measures were taken. That is, the pressure adjustment device 24 is interposed between the rear cover 9 and the rotary side frame 11 or the rear cover 9 and the main cover 8, and this pressure adjustment device 24 includes a hollow pipe 25 having an elliptical cross section; Pressure adjustment of a rear cover characterized by comprising a spring 26 wound around a hollow pipe 25 and a plurality of locking grooves 27 into which locking portions 31 at the lower part of the spring 26 can be fitted and locked. The configuration of the device.

[Examples and effects] Hereinafter, the present invention will be described in detail based on the drawings.

First, the structure will be explained. Reference numeral 1 is a side drive type rotary tiller that is connected to the rear part of a tractor via a three-point link mechanism so as to be able to be raised and lowered.

This rotary tiller 1 consists of a tilling shaft 3 on which a plurality of tilling claws 2 are installed, a chain case 4 that is located on both left and right sides of the tilling shaft 3, and side plates (not shown) that support the tilling shaft 3.
, an input shaft 7 that is rotatably mounted forward on a gear box 6 at the center in the left and right lateral directions in order to receive rotational power from the tractor side, a main cover 8 that covers the top of the tilling section;
It consists of a rear cover 9 pivotally attached to the rear of the main cover 8, a side cover 10.10 located on the lateral side of the tilling section and integrally formed with the main cover 8, and the side cover 10.10 and the main It is configured to rotate back and forth around the axis of the tilling shaft 3 integrally with the cover 8. Reference numeral 11.11 is a pipe-shaped pitch, and reference numeral 12.12 is a slide hitch fitted to the hitch 11.11 so as to be able to slide back and forth, and to which a working machine or the like is attached to the rear. 13 is a mast, 14.14 is an auxiliary mast, and the mast 13 supports a plowing depth adjustment screw 15 for adjusting the plowing depth and an adjustment screw punch 16 for rotating the main cover 8. There is. The lower end of the tillage depth adjusting screw 15 is connected to a plate 20 fixed to a rod (not shown) that connects the hitches 11 and 11, and the lower end of the adjusting screw 16 is erected at the upper rear part of the main cover 8. It is connected to a plate 21. Also,
A pair of support plates 22.22 are fixed diagonally rearward at two left and right positions in the rear upper part of the main cover 8, and a pressure adjustment device 24 is provided between the pair of support plates 23.22 fixed to the upper surface of the rear cover 9. .24 is installed. The left and right pressure adjustment devices 24.24 have the same structure, and to explain the structure on the other side specifically, this pressure adjustment device 24 includes a pipe 25 with a hollow elliptical cross section and a winding around the pipe 25. A locking part 31 is provided at the lower part of the spring 26, the distance between two opposing sides being smaller than the diameter of the middle part, and a plurality of locking grooves 27 are provided in the middle part of the pipe 25. ...is provided. The upper intermediate portion of the pipe 25 is inserted through and supported by a piece 3o pivotally connected to the tip of the support plate 22 with a pin 28. When changing and adjusting the pressing force of the rear cover 9, the position of the locking groove 27 with which the locking portion 31 at the lower part of the spring 26 engages is appropriately selected and adjusted. To tighten the locking part 31 of the spring 26, rotate it approximately 90 degrees to remove it from the locking groove 27, move it upward, and then rotate it 90 degrees again to set the appropriate locking position. Engage with the stop groove 27.

It should be noted that another spring 32 is wound around the top of the piece 30, and has a locking portion at the bottom like the lower spring 26.

Next, a method for manufacturing the pipe 25 having a hollow elliptical cross section and forming the pressure adjustment device 24 will be explained based on FIG. In order to manufacture such a pipe 25, first, a pipe 25a having a cylindrical cross section is compressed using a press device (Fig. 6 (b)), and after turning it 90 degrees, metal fittings are attached to both sides to prevent it from moving. At 33.33, the jig 34.34 having a plurality of convex portions is fixed and compressed again with a press device (FIG. 6(c)). In this way, the hollow elliptical pipe 25 can be manufactured through two-step press processing, resulting in lower processing costs.Moreover, since no cutting is performed, the wall thickness of the pipe 25 is kept approximately constant, and its strength is increased. Furthermore, when forming the locking groove 27, a shallow inclined surface with an angle α is formed on the pipe 25 as shown in FIG. It is safe and there is no risk of cutting your hand due to the pipe 25 when moving the pipe.

Although the pressure adjustment device 24 is interposed between the main cover 8 and the rear cover 9 in this embodiment, it may be interposed between the rotary side frame 11 such as a pitch and the rear cover 9.

[Effects of the Invention] Since the present invention is configured as described above, it has the following technical effects. That is, the pipe 25 of the pressure adjustment device 24 that pressurizes the rear cover 9 is configured to have a hollow elliptical cross section, and a plurality of locking grooves 27 are provided in the longitudinal direction of the pipe 25.
... is provided, and the locking portion 31 of the spring 26 wound around the pipe 25 is engaged with any one of the locking grooves 27 to adjust the pressing force of the rear cover 9, so the structure is simple. It can be manufactured at low cost, and its handling performance is the same as that of conventional products, so it can be put to practical use.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, with FIG. 1 being an overall side view of a rotary tiller, and FIG. 2 being a front view of a pipe. 3 is a side view, FIG. 4 is a plan view, FIG. 5 is a bottom view, and FIGS. 6 (a), (b), (c), and (d) are action explanatory views. Explanation of symbols 1 Rotary tilling device 8 Main cover 9 Rear cover 24 Pressure adjustment device 25 Pipe 26 Spring 27 Locking groove 31 Locking part

Claims (1)

[Claims] A pressure adjustment device 24 is interposed between the rear cover 9 and the rotary side frame 11 or the rear cover 9 and the main cover 8, and this pressure adjustment device 24 includes a hollow pipe 25 having an elliptical cross section and a hollow pipe. 25, and a plurality of locking grooves 27 into which locking portions 31 at the lower part of the spring 26 can be fitted and locked.