JPH0737973Y2 - Walk-behind farm work machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is provided with a PTO shaft projecting rearward from the rear part of a mission case of a traveling airframe, and from this PTO shaft to a rotary pawl shaft of a rotary tiller. The present invention relates to a walk-behind agricultural work machine configured to transmit power.

[Conventional technology]

In this type of walk-type agricultural work machine, conventionally, in order to change and adjust the rotational drive speed of the rotary pawl shaft according to the soil type, the type of work, etc., as shown in, for example, Japanese Utility Model Laid-Open No. 62-97831, transmission is performed. There has been a structure in which the case is configured to be detachable and can be attached by mounting it in the reverse direction.

[Problems to be solved by the invention]

However, in the above-described conventional structure, a transmission belt and a transmission case covering the transmission belt are required, and since the structure projects laterally outward of the machine body, there is an adverse effect of enlarging the machine body.

In order to solve the above problems, recently, an engine having a rearward output shaft and a mission case were directly connected, and a PTO shaft protruding rearward from the sewing machine case was linked with a rotary pawl shaft of a cultivator through a bevel gear and the mission was A structure in which a speed change mechanism is provided inside a case or a cultivating device body has been proposed and partially put into practical use.

However, it is difficult for the transmission mechanism installed in the mission case or the tiller apparatus body to support various kinds of drive transmissions depending on the soil quality and the working condition.

The purpose of the present invention is to make it possible to change the drive speed of the PTO shaft to various types according to the work situation without increasing the size of the machine body.

[Means for solving problems]

The present invention, in order to achieve the object, in the walking type agricultural working machine described at the beginning, a power take-in shaft of the rotary tiller is provided in the front part of the tiller body of the rotary tiller, and an output of the PTO shaft is provided. A gear type speed change case for changing speed and transmitting the power to the power intake shaft is arranged between the rear side of the mission case and the front side of the tiller apparatus body and is attachable / detachable to / from the mission case and the tiller apparatus body. It is characterized by being connected to. The action and effect are as follows.

[Action]

Since the speed change case is a gear bite type, it can be made much smaller than a belt type transmission case,
In addition, it is installed between the rear side of the mission case and the front side of the tiller machine body, and since it is detachable from each, it is necessary to reverse only the transmission case and install it, or replace it with another one with a different gear speed ratio. Will be easier.

[Effect of device]

Therefore, in the case of cultivating work, the drive rotation speed can be changed according to the soil quality, the work situation, etc. by simply replacing the speed change case, and the size of the machine body is not increased. Of.

〔Example〕

FIG. 5 shows a walk-type cultivator which is an example of the walk-type agricultural working machine according to the present invention. In this cultivator, an engine (2) having a rearward-facing output shaft (1) is arranged in the front part of a traveling body (3), and a mission case (4) is connected to the rear part of the cultivator, so that the mission case (4) Is supported by a pair of left and right propulsion wheels (6) and (6) via a transmission case (5) below the vehicle, and an operation handle (7) is extended from the upper portion of the transmission case (4) toward the upper rear side. I am doing it.

A rotary tiller (9) is detachably connected to a rear portion of the mission case (4) through a gear type transmission case (8).

As shown in FIGS. 1 and 2, the rear end of the output shaft (1) of the engine (2) is supported by the input shaft (supported by the transmission case (4) via the dry multi-plate clutch (10). 11) is operatively connected to the cylinder shaft (13), and the power of the input shaft (11) is transmitted to the cylinder shaft (13) via the transmission mechanism (12) in the upper inside of the transmission case (4), and , This cylinder shaft (1
3) A transmission shaft (15) and an axle (16) in the vertical direction are provided via either a pair of bevel gears (14), (14) that are fitted over the idler.
The transmission power is transmitted to the.

Next, the drive transmission system of the rotary tiller (9) will be described in detail.

PT extending in the front-rear direction on the left side of the input shaft (11)
The O-axis (17) is idly supported by the mission case (4) by the bearing (18) such that the rear end side of the mission case (4) projects rearward from the rear of the mission case (4). By shifting the shift gear (19) that is fitted to the front part in the axial direction so that the spline is fitted onto the spline so that it can be shifted forward and backward, the drive gear (20) or (21) can be selectively occluded and interlocked. The shaft (17) is configured to be switchable between a high speed drive state, a low speed drive state and a neutral idle state. And this PTO axis (17)
Is fitted in the cylindrical shaft (13) so as to be rotatable relative thereto.

In the rear part of the mission case (4), a gear type gearshift arranged between the rear side of the mission case (4) and the front side of the tiller device body (27) which is a transmission case of the rotary tiller (9). The case (8) is detachably bolted. A pair of idle shafts (22
Bearings (a) and (22b) are supported, and the PPTO shaft (17) is fitted to both ends of the idle shafts (22a) and (22b) so that rotational power can be transmitted, and the fitting is removable. Dowel (23),
(23) is formed. Further, gears (24a) and (24b) of different diameters are fixed to one idler shaft (22a), and the other idler shaft (22b) is interlocked with the gears (24a) and (24b). A shift gear (25) which is capable of shifting operation in the axial direction is fitted on the spline. The shift gear (25) is configured to be shifted forward and backward by the operating member (26) so that the transmission gear ratio can be changed.

A front end portion of the cultivating device body (27) of the rotary cultivating device (9) is detachably bolted to a rear portion of the speed change case (8) so as to project forward from the front end portion of the cultivating device body (27). The power intake shaft (28)
It is fitted to 5). Then, the power of the PTO shaft (17) passes through the idle shaft (22b), the shift gear (25), the gear (24a) or (24b), and the idle shaft (22a) to the power intake shaft (2
8) is transmitted to the rotary pawl shaft (32) via the bevel gears (29) and (30) and the vertical axis (31), and the rotary pawl shaft (32) is driven by the switching mechanism (33). ) Is configured to be capable of switching between forward and reverse rotation.

When changing the drive speed of the rotary pawl shaft (32), in addition to switching the shift gear (19) at the front of the PTO shaft (17), as shown in FIG. 8) is installed upside down and the PTO shaft (17) and power intake shaft (28) are fitted together, or the 4th
By directly connecting the PTO shaft (17) and the power intake shaft (28) as shown in the figure, various gear ratios can be changed.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a walk-behind agricultural working machine according to the present invention. Fig. 1 is a longitudinal side view of the main part, Fig. 2 is a cross-sectional plan view of the main part,
FIG. 3 and FIG. 4 are transmission system diagrams showing the attachment change state of the transmission case, and FIG. 5 is an overall side view of the walk-type cultivator. (3) …… Traveling aircraft, (4) …… Mission case,
(8) …… Shift case, (17) …… PTO shaft, (9) ……
Rotary tiller, (28) …… Power intake shaft, (32) ……
Rotary claw shaft.

Claims (1)

[Scope of utility model registration request] 1. A mission case (4) for a traveling vehicle (3).
A walk-type agricultural work provided with a PTO shaft (17) protruding rearward from the rear part of the airframe and configured to transmit power from the PTO shaft (17) to the rotary pawl shaft (32) of the rotary tiller (9). The rotary power tiller (9) is provided with a power intake shaft (28) at a front portion of the rotary tiller (9), and the output of the PTO shaft (17) is provided. Change the speed to change the power intake shaft (2
A gear-type speed change case (8) transmitted to the rear side of the mission case (4) and the tiller apparatus body (27).
A walk-behind agricultural working machine which is arranged between the front side of the vehicle and the mission case (4) and is detachably connected to the tiller apparatus body (27).