JPH0414964Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a walk-behind cultivator in which a rotary tiller case is detachably connected to the rear surface of a transmission case on the main machine side.

Conventionally, in such tillers, the tilling rotary case is connected to a hitch attached to the back of the machine side transmission case, and the chain case that transmits the output of the machine side transmission case to the tilling rotary case is connected to the machine side transmission case. Although it is connected to the side surface of the case, see, for example, Japanese Utility Model Application Publication No. 154913/1983)
In this case, a special chain case is required, so
There was a disadvantage that the overall structure was effective.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to simplify the transmission structure from the machine side transmission case to the tilling rotary case. The purpose is to make assembly work easier.

The characteristic configuration of the walk-behind cultivator according to the present invention is that the driven side connection part provided at the upper end input part of the tilling rotary case can be attached and detached from the drive side connection part provided on the back side of the power transmission case of the machine. It can be freely provided and has the configurations described in [A] to [E] below.

[B] The drive-side connection section connects a power take-off shaft that is disposed in a direction that intersects the rear-facing surface of the work equipment connection hit provided on the rear surface of the machine-side transmission case, and a power take-off shaft that is and a connecting cylindrical part that is held in a fitted state.

[B] The driven side connection portion is composed of an input shaft provided in a forward-protruding posture at the upper end side input portion of the rotary case, and a connection cylindrical portion that holds the input shaft in an externally fitted state. .

[C] The working device connecting hit is formed into a U-shape in side view, and is configured integrally with a connecting cylindrical portion that externally fits and holds the power take-off shaft, and has the connecting cylindrical portion on the rearward facing surface. A through hole is formed into which a part of the connecting cylindrical portion that externally holds the input shaft is fitted.

[d] The connecting cylindrical part is connected to the working equipment connecting hitch, and includes a spigot part that fits into the through hole of the working equipment connecting hitch and a flange part that makes surface contact with the rearward facing surface. and is configured to be detachable.

[E] The lower end in the power transmission direction of the power take-off shaft on the machine side is located closer to the rear-facing surface than the pin connection location of the work equipment connection hitch, and the power take-off shaft on the machine side, , the rotary case side input shaft is provided in each of the two cylindrical parts in a state that the two cylindrical parts can be freely connected and disconnected as the two cylindrical parts are fitted and separated from each other at the hitch portion for connecting the working device. There is.

Next, the effects of the feature configuration of the present invention will be described.

In other words, the power take-off shaft on the machine side is provided so as to intersect with the rearward facing surface of the work equipment connection hitch and protrude from the rearward facing surface, while the input shaft on the rotary case side is provided so as to protrude forwardly from the upper part of the rotary case. In other words, by directly connecting the power take-off shaft on the machine side and the input shaft on the rotary case side, the power can be transmitted from the machine side to the rotary case side using a simple structure that does not require a special transmission mechanism. In addition, when the cylindrical part provided on the rotary case side is fitted into the cylindrical part on the transmission case side, the two shafts are automatically coupled, so that the transmission Although it aims to simplify the structure, it is designed to make it easy to assemble the rotary case.
We have achieved a walk-behind cultivator that is excellent both in terms of actual manufacturing and assembly work.

Moreover, since the work equipment connection hitch is a work equipment connection hit that can connect not only the tillage equipment but also other attachment work equipment such as a plow, the versatility of the work equipment can be improved. In addition, since the rotary case is attached using the work equipment connection hit, that is, the work equipment connection hit with high strength, the connection strength of the rotary case can be increased.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, at the rear of the engine 1,
The transmission case 2 is connected, the wheel drive chain case 3 is connected to the right side surface of the transmission case, the tilling rotary case 4 is removably connected to the rear side of the transmission case, and the pair of left and right control handle rods are connected. 5
is attached to the upper side of the transmission case, and one propulsion wheel 6 is provided so as to be inserted under the engine 1 and the transmission case 2, thereby constructing a walk-behind cultivator.

To explain the transmission structure inside the chain case 3, as shown in FIGS. 2 and 5, the upper end side input shaft 7 is connected to the transmission shaft 8 inside the machine side transmission case 2.
The input shaft 7 and the lower end axle 9 are interlocked with each other by a chain 10. In addition, when configuring the chain case 3,
A pair of split case parts 3a and 3b made of sheet metal are connected with bolts, and a cylindrical part 11 that also serves as a bearing holding part is formed in the transmission case side split case part 3a to be fitted and supported by the transmission case 2. ,or,
A cylindrical holding part 1 that holds a bearing 12 for supporting an axle is provided at the lower end side of both case parts 3a and 3b, respectively.
3a, 13b, and plate-shaped parts 14a, 1 that fit onto the inner end of the case of the bearing 12.
4b are welded to both case parts 3a and 3b, respectively.

To explain the connection structure of the rotary case 4, as shown in FIG. 2 to FIG. A driven side connection part B provided at the upper end side input part is fitted and connected.

The drive side connection part A is a drive side connection part A that is disposed in a direction intersecting the rear facing surface 18a of the working device connection hitch 18, which is formed in a U-shape when viewed from the side and is provided on the back surface of the machine side transmission case 2. A shaft 19 and a connecting cylindrical portion 1 that holds the power extraction shaft 19 in an externally fitted state.
6, and a through hole a is formed in the rear facing surface 18a of the working device connecting hitch 18.

The driven side connection portion B is connected to the rotary case 4.
It is composed of an input shaft 20 provided in the upper end side input part in a forward protruding posture, and a connecting cylindrical part 15 that holds the input shaft 20 in an externally fitted state. It is provided with a spigot part 15a that fits into a through hole a formed in a rearward facing surface 18a of the device connecting hitch 18, and a flange part 17 that makes surface contact with the rearward facing surface 18a.

Then, the connection cylindrical part 1 of the driven side connection part B
The spigot part 15a of No. 5 is fitted into the through hole a formed in the rearward facing surface 18a of the working device connecting hitch 18 of the drive side connection part A, and the flange part 17 is fixed with bolts.

Then, the lower end in the power transmission direction of the power take-off shaft 19 on the machine side is located closer to the rear facing surface 18a than the pin insertion hole 18b of the working device connection hitch 18, that is, the connection location, When connecting other attachment work equipment such as a plow with the rotary case 4 removed,
The power take-off shaft 19 on the main body side is arranged so as not to become an obstacle.

In order to transmit the power from the power transmission case 2 on the machine side to the tilling rotary case 4, the power take-off shaft 1 on the machine side is used.
9, and the rotary case side input shaft 20 is connected to both the cylindrical parts 15, 16 in a state where the connection can be freely released as the cylindrical parts 15, 16 for connection are fitted and separated.
, and is configured to be able to be switched between a transmission state and a transmission release state as the rotary case 4 is attached or removed.

In other words, the input shaft 20 on the rotary case side is supported by a bearing in a cylindrical shape that is fitted externally with a spline on the power output shaft 19, and is interlocked with a bevel gear to the transmission shaft 22 to the tilling shaft 21. The extraction shaft 19 is supported by a bearing while being fitted onto the transmission shaft 8 inside the transmission case, and an input gear 19a is integrally formed therein.

Next, another example will be described.

The rotary case side cylindrical part 1 is attached to the machine side cylindrical part 16.
Instead of fitting the rotary case side cylindrical part 15 inside the machine side cylindrical part 16, the rotary case side cylindrical part 15 may be fitted externally.

Furthermore, the structure that allows the power take-off shaft 19 and the input shaft 20 to be freely connected and disconnected can be modified in various ways, such as by providing an interlocking protrusion at each end of both shafts 19 and 20 instead of the spline fitting structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind cultivator according to the present invention, with Fig. 1 being a side view of the walk-behind cultivator, Fig. 2 being a cross-sectional plan view of the transmission structure, and Fig. 3 showing the mounting part of the tilling rotary case. 4 is a cutaway rear view of the same part, and FIG. 5 is a vertical sectional rear view of the chain case. 2... Machine side transmission case, 4... Tilling rotary case, 15, 16... Connection cylindrical part, 15a...
...Through hole, 17...Flange portion, 18...Hitch for connecting work equipment, 18a...Rearward facing surface, 19...
Machine side power take-off shaft, 20... Rotary case side input shaft, a... Through hole, A... Drive side connection part, B...
...Driven side connection part.

Claims (1)

[Scope of Claim for Utility Model Registration] The driven side connection part B provided on the upper end side input part of the tilling rotary case 4 is attached to and detached from the drive side connection part A provided on the back side of the machine side transmission case 2. A walk-behind cultivator that can be freely installed and has the configurations described in [A] to [E] below. [B] The drive side connection part A is connected to a power take-off shaft 19 disposed in a direction intersecting the rear facing surface 18a of the work equipment connection hitch 18 provided on the back surface of the machine side transmission case 2, and Power take-off shaft 19
and a connecting cylindrical portion 16 that holds the connector in an externally fitted state. [B] The driven side connection portion B includes an input shaft 20 provided in the upper end side input portion of the rotary case 4 in a forward protruding posture, and a connecting cylindrical portion 15 that holds the input shaft 20 in an externally fitted state. It consists of [C] The working device connecting hitch 18 is formed in a U-shape when viewed from the side, and is integrally formed with the connecting cylindrical portion 16 that externally holds the power take-off shaft 19, and is connected to the rearward facing surface. 18a, a connecting cylindrical portion 15 that externally holds the input shaft 20;
A through hole a into which a part of the is inserted is formed. [D] The connecting cylindrical portion 15 includes a spigot portion 15a that fits into the through hole a of the working device connecting hitch 18, and a flange portion 17 that makes surface contact with the rear facing surface 18a, and connects the working device. It is configured to be able to be connected and disconnected from the utility hitch 18 at will. [E] The lower end of the machine-side power take-off shaft 19 in the power transmission direction is connected to the work equipment connection hitch 1.
The power take-off shaft 19 on the machine side is located closer to the rearward facing surface 18a than the pin connection point No.
The rotary case side input shaft 20 connects and disconnects the two cylindrical parts 15 and 16 in a state where they can be freely connected and disengaged as the two cylindrical parts 15 and 16 are fitted and disengaged at the working device connecting hitch 18 portion. 15,1
6 are provided for each.