JPS5936961Y2 - tillage case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil wetting hole in a tilling case that houses the tilling transmission system of a walk-behind tiller.

As shown in Fig. 4, a conventional tillage case is provided with a lubricant oil quantity gauge hole 21 and an oil contact hole 22 separately, and when the walk-behind tiller is placed in a predetermined position, the tillage case is An oil wetting hole 22 is provided at the bottom, and oil quantity gauge holes 21 are independently installed at the middle portion of the tilling case corresponding to an appropriate set oil level.

However, in general, the claws of walk-behind tillers touch the ground when tilling, and must be lifted above the ground when transporting, so it is necessary to change the position of the tilling case as appropriate.

For example, in the case of a two-wheeled vehicle, the position of the tilling case is changed by tilting the tilling case by rotating it up and down about the axle as shown in FIG.

The present invention focused on the tilting movement of the tilling case and found that by appropriately setting the position of the oil wetting hole, the separate gauge hole and oil wetting hole described above could be combined into one hole. This is where we propose its structure.

That is, the tilling case has oil contact holes provided at relative positions such that when the tilling case is tilted, it is located at a predetermined oil level, and when the tilling case is upright, it is located at the bottom.

The drawings show a tilling case of a two-wheeled tiller as a specific example thereof, and FIG. 1 is a schematic side view of the whole.

This tiller has an engine 2 mounted on a frame 1, and a two-wheeled vehicle 3 installed behind the frame 1. Power is transmitted from the engine drive shaft 4 to a human power shaft 5 by a belt drive, and from here to an axle 7 by a transmission 6. is transmitted to the tilling shaft 9 by a transmission device housed in the tilling case 8, and the tilling claws 10 rotate to perform tilling.

A handle 11 and various operating rods are provided at the rear of the frame 1, and a tail wheel 12 is provided at the lower rear.

As shown by the solid line in Figure 1, the tilling case 8 that is the subject of this invention is in a position with a small inclination angle that is close to upright when the frame 1 is almost horizontal, and the tiller body is moved forward until the front part of the frame 1 touches the ground. When tilted, the tilling case 8 also tilts forward about the axle 7, and tilts to a nearly horizontal state as shown by the two-dot chain line in the figure.

Therefore, this tillage case 8 becomes an oil wetting hole at the position indicated by the solid line or at the position indicated by the dashed-dotted line, which is a position below the solid line.
At the position indicated by the two-dot chain line when the vehicle body is tilted forward, a through bolt hole 13 is drilled at the position that will become the oil level gauge hole, and a bolt 14 is screwed into the bolt hole 13.

15 indicates a proper amount of oil level.

A side view of the vicinity of the oil drain hole of tillage case 8 is shown in Figure 2.
The AA sectional view is shown in FIG.

As seen in these figures, the left and right tillage cases 8a
A hole is drilled at the midpoint of the joint of 8b, and a nut 16 is welded around the hole to form a bolt hole 13, into which a bolt 14 is screwed.

At this time, an O-ring 17 for preventing oil leakage is inserted into the bolt 14 as in the conventional case.

In a tilling case having such a structure consisting of left and right mating cases, since there is only one hole in the mating part, welding of the mating cases becomes extremely easy.

That is, the reason is that the welding of the hole part must be done manually, but the other parts can be welded automatically.

Additionally, the process for drilling holes and assembling bolts is halved.

In addition, since one bolt hole 13 is provided on the center line of the left-right symmetrical mating case, only one mold is required for manufacturing the tilling case, and manufacturing costs can be significantly reduced, among other manufacturing advantages. There are many benefits to rationalization, such as the ability to check the oil level and change the oil by simply opening and closing a single bolt.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the entire tiller equipped with the tilling case of the present invention, Fig. 2 is an enlarged side view of the vicinity of the oil drain hole of the tilling case, and Fig. 3 is an A-A in Fig. 2. cross section,
FIG. 4 is a schematic side view of a conventional tillage case. 8...Tilling case, 9...Tilling shaft, 10...Tilling claw, 13...Bolt hole, 14...Bolt, 15 ······Oil surface,
16...Natsuto, 17...0-ring.

Claims (1)

[Scope of utility model registration request] Engine 2 mounted on frame 1 and tillage case 8
In the walk-behind tiller, a tilling section formed by supporting a tilling shaft 9 is provided in a manner distributed back and forth around the axle center, and the tilling section is raised and lowered by back and forth rocking of the machine body about the axle. The tilling case 8 is formed by joining the left and right cases 8a and 8b which are joined at the midpoint in the left-right direction, and the extended end of the tilling case has a case that spans the joint and is located at the center in the front-rear direction. A bolt hole 13 is provided, and when the front part of the frame 1 touches the ground, the bolt hole is raised and held at a position where it can be checked whether the lubricating oil in the tilling case is in the proper amount. A walking tillage case featuring: