JPH02100607A - Structure for working clutch of agricultural working machine - Google Patents

Abstract

PURPOSE:To prevent a situation in a state of a connected clutch until a working device attains a prescribed position by setting a clutch connection operating mechanism at a lower operating speed than that of a clutch disconnection operating mechanism respectively operated by operating tools. CONSTITUTION:A clutch connection operating mechanism and a clutch disconnection operating mechanism for an operating clutch are linked to an operating lever 8 for lifting or lowering a working device. The clutch connection operating mechanism is set at a lower operating speed than that of the clutch disconnection operating mechanism so as to attain the working clutch in a connection state behind. Thereby, the working device attains a prescribed position during the time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to agricultural working machines such as rice transplanters, which are particularly characterized by the operation structure of a working clutch that controls the operation of the working device.

[Conventional technology]

When starting planting work using a riding-type rice transplanter, which is one of the agricultural machines, the seedling planting device, which is a working device that was lifted upward, is lowered to the rice field, and then the seedling planting device, which is a working device, is lowered to the rice field, and then The planting clutch is turned on to operate the seedling planting device and perform seedling planting work. In some cases, such operations are configured such that raising and lowering of the seedling planting device and important operations of the planting clutch can be performed using a single operating lever, which is a manual operating tool. (Unexamined Japanese Patent Publication No. 61-24
(See Publication No. 7309) [Problems to be Solved by the Invention] As mentioned above, operability is improved by configuring the system so that the lowering operation of the seedling planting device and the engaging operation of the planting clutch can be performed continuously using one operation lever. However, if the control lever is quickly operated from the lowered position of the seedling planting device to the human position of the planting clutch, for example, the following inconvenience will occur. In other words, while the seedling planting device is descending, the planting clutch becomes in a large state and the seedlings are thrown away in the air.

The present invention has been developed by focusing on the above-mentioned problem, and when the operation of changing the position of the working device and the operation of engaging the work clutch are performed consecutively, it is difficult to solve the problem until the working device reaches the predetermined position. The purpose of this is to prevent situations where the working clutch becomes in a critical state.

[Means to solve the problem]

The feature of the present invention is that the working clutch structure of the agricultural working machine as described above is configured as follows.

In other words, a clutch-on operation mechanism and a clutch-off operation mechanism are provided for the work clutch that switches the power transmitted to the work device between the transmission ON state and the transmission OFF state, and the operation of the manual operation tool to the clutch input side is provided. The human operating tool, the clutch engaging operating mechanism, and the clutch disengaging operating mechanism are arranged so that the clutch engaging operating mechanism is operated by the manual operating tool, and the clutch disengaging operating mechanism is operated by operating the manual operating tool toward the clutch disengaging side. The operation speed of the clutch engagement operation mechanism is set to be lower than the operation speed of the clutch disengagement operation mechanism.The functions and effects thereof are as follows.

[For production]

With the configuration described above, even if the manual operation tool is operated to the clutch input side after the position change operation of the work device is performed, the work clutch will not be brought into the large state immediately, but will be brought into the large state after a delay. becomes. As a result, there is some time before the work clutch goes into the large state, so the work device can reach the predetermined position within this time.

〔Effect of the invention〕

As described above, by configuring the work clutch so that the work clutch enters the large state with a delay even if the manual operating tool is operated to the clutch input side, the work clutch becomes large even though the work device has not reached the predetermined position. Things that could result in a situation B
(In a riding-type rice transplanter, the situation where the planting clutch becomes in a serious state while the seedling planting device is lowered) can now be reduced.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be described using a riding type rice transplanter, which is one of agricultural working machines, based on the drawings.

As shown in Figure 3, a planting arm (2) is provided at the rear of the planting mission case (1), and a seedling stand (3) is provided at the top.
is supported to constitute a seedling planting device as a working device (4), and the seedling planting device (4) is connected to a four-speed link mechanism (5) extending from the fuselage (not shown). There is.

A single-acting hydraulic cylinder (6) for raising and lowering the four-speed link mechanism (5) is attached to the four-speed link mechanism (5), and as shown in FIG.
) is supported so as to be swingable around a vertical axis (Pl). In other words, when the operating lever (8) is operated to the raised position (U),
The control valve (9) for the hydraulic cylinder (6) is operated to the hydraulic oil supply side by the control device (12), and the seedling planting device (4) is operated.
When the control lever (8) is operated to the lower position (D), the control valve (9) is operated to the oil drain side and the seedling planting device (4) is lowered. Further, (N) is a neutral stop position.

The planting mission case (1) has a horizontal axis (P2
) is attached with a sled-shaped ground sensor (10) that can freely swing up and down and follows the ground contact with the mud surface (G), and a potentiometer (11) that detects the swing angle of this ground sensor (10). The signal from the control device (12)
is man-powered. As a result, when the operating lever (8) is operated to the planting position (A), the switching valve (14) for the planting clutch, which serves as the working clutch (13) that controls the power to the seedling planting device (4), is activated. The clutch is operated via the linkage mechanism (15), and the control valve (9) is switched so that the signal from the potentiometer (11) falls within the set range. In other words, while the seedling planting device (4) is manually raised and lowered to maintain the set height above the mud surface (G), the planting arm (2)
) seedlings are planted on the mud surface (G).

Next, to explain the planting clutch (13) in detail, as shown in FIG. ) A bevel gear (17) is fitted on the outside so as to be relatively rotatable, and a shift member (1
8) is attached to the spline structure so that it can slide freely and rotate together with the spline structure. In the state shown in Fig. 1, the switching valve (14) is moved to the clutch disengaged side (14a) due to the biasing force of the spring (19) (the operating lever (8) is in the raised position (U),
Indicates a state in which the vehicle is operated to either the neutral stop position (N) or the descending position (D).
Hydraulic oil from the pump (20) is supplied to an oil chamber (18b) within the shift member (18).

As a result, the shift member (18) is slid to the left in the drawing against the biasing force of the spring (21), and the convex portion (18a) of the shift member (18) aligns with the convex portion (17a) of the bevel gear (17). The planting clutch (13) is in a disengaged state further away. And the shift member (18)
If it moves too far to the left in the drawing, hydraulic oil is drained from the drain oil passage (18c) on the shift member (18) side, and the movement of the shift member (18) to the left in the drawing stops.

Moreover, a planting arm (2) is attached to the outer periphery of the shift member (18).
is above the mud surface (G) and corresponds to the position where the seedling stand (3) stops before cutting out the seedlings (18d).
) is provided, and a pin (22) is attached to the fixed side. This allows the pin (22) to fit into the notch (18d) when the shift member (18) is hydraulically slid to the left in the drawing to disengage the planting clutch (13). It is configured so that the planting clutch (13) can be disconnected only when the planting arm (2) is in the above-mentioned upper position.

Then, when the operating lever (8) is operated to the planting position fit (A), the switching valve (14) is moved to the clutch entry side (14b) (
(oil draining side), and the shift member (18) is moved to the right in the drawing by the biasing force of the spring (21). In this case, there is a throttle section in the oil drain path (23) from the switching valve (14).
24) is provided so that the hydraulic oil discharged from the oil chamber (18b) is subjected to a throttling action.

As a result, the shift member (18) moves to the right in the paper at a lower speed than the moving speed to the left in the paper (the disengaged side of the planting clutch (13)), and the convex portion (18a
) meshes with the convex portion (17a) of the bevel gear (17), and the planting clutch (13) enters the engaged state.

Further, as shown in FIG. 2, a knob (8a) at the tip of the operating lever (8) is supported so as to be rotatable within a set angle, and a potentiometer (25) is provided to detect the rotation angle of this knob (8a). ) is manually input to the control device (12). By rotating the knob (8a), it is possible to change the control sensitivity of the automatic raising and lowering operation of the seedling planting device (4), that is, the width of the dead zone.

The operating lever (8) is configured to be able to swing around the axis (P3) within a set angle, and a signal from a potentiometer (26) that detects this swinging operation is transmitted to the control device (12). is man-powered. By swinging the operating lever (8) around the axis (P3), when lowering the seedling planting device (4), either the right marker or the left marker (not shown) is operated. You can choose whether to display it or not.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the working clutch structure of the agricultural machine according to the present invention, FIG. 1 is a diagram showing the transverse plane of the planting clutch and the hydraulic circuit of the planting clutch, and FIG. 2 shows the structure near the operating lever. The plan view and FIG. 3 are side views of the seedling planting device. (4)... Working device, (8)... Human operating tool, (13)... Working clutch. Hesa

Claims (1)

[Claims] A work clutch (13) that switches the power transmitted to the work device (4) between a transmission on state and a transmission off state is provided with a clutch on operation mechanism and a clutch off operation mechanism, and a human operation tool (8). A human operating tool (
The human operating tool (8) is linked to the clutch engaging operating mechanism and the clutch disengaging operating mechanism such that the clutch disengaging operating mechanism is operated by the operation of the clutch disengaging side in step 8), and
A working clutch structure for an agricultural machine in which the operating speed of a clutch engaging operating mechanism is set to be lower than the operating speed of a clutch disengaging operating mechanism.