JPS5940649B2 - Rotary Craftsman - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-klee clutch structure for a walk-behind cultivator.

In this type of clutch structure, it is necessary to disable the clutch when the aircraft is moving backwards to prevent backward plowing, and on the other hand, the clutch is engaged when the aircraft recognizes that it is moving backwards. In other words, it is also desired to be configured so that backward tillage can be performed.

In addition, the lever of a rotary clutch is usually configured to be able to switch freely between two positions, an engaged position and a disengaged position, and a rotary clutch structure equipped with this unstable switching type rotary clutch lever It is desired that the above requirements can be satisfied.

Therefore, the present invention is configured such that the rotary clutch lever can be freely switched between two positions, ie, an engaged position and a disengaged position, and the rotary clutch lever is configured to be able to shift freely between two positions, an engaged position and a disengaged position. An interlocking mechanism is provided for forcibly shifting from the position to the automatic switching position beyond the unstable switching dead center, and the clutch is manually operated to the engaged state within the range from the automatic switching position to the clutch disengaged position. The feature is that an operating position range is provided for this purpose.

In other words, as the rotary clutch lever is necessarily forced to the clutch disengaged position via the interlocking mechanism as the tiller body shifts backward, it is certain that the backward tilling state will unexpectedly appear. In addition, since there is an operating position range for operating the clutch in the engaged state within the range from the lever's automatic shift position to the clutch disengaging position, the lever must be operated and maintained in this operating position. It is also possible to perform reverse plowing if the lever is released, and the clutch automatically and quickly disengages, so no special action is required to disengage the clutch in an emergency. Instead, it is possible to simply release the lever to the free state, thereby achieving a rotary clutch structure that is excellent in terms of safety in the dangerous backward plowing state.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure shows the rear part of the tiller main body A, which consists of a front engine 1, a driving transmission case 2, a rear control handle 3, etc.
This figure shows a walk-behind cultivator that is connected and equipped with a rotary device B.

The rotary device B is configured such that a tilling rotor 4 is pivotally supported at the lower part of a transmission case 8 connected to a side portion of a mission case 2, and a rotary device B attached to the control bundle 3 The tilling rotor 4 is configured to be switched between an operating state and a non-operating state by swinging a clutch lever (hereinafter referred to as a rotary lever lever) back and forth.

That is, as shown in FIG. 2, a clutch movable piece 7 is spline-coupled to the end of the tilling rotation shaft 6 which is pivotally supported by the mission case 2 so as to be slidable in the axial direction, and a rotary device B A clutch fixing piece 9 is loosely fitted and supported in the side transmission case 8, and the engaging parts formed at the opposing ends of these clutch pieces 7 and 9 are engaged and separated to switch the rotary device B between operation and non-operation. Rotary clutch L
μ is configured.

The movable clutch piece 7 is pivotally connected to the transmission case 2 and is configured to be moved in the axial direction by the swinging of a shift arm 11 that is securely connected to the outer circumference of the clutch piece 7. .

Further, a C-shaped link 12 is pivotally connected to the rotary lever 5 for stably switching and holding the lever 5 in two positions, a clutch engaged position a and a clutch disengaged position. Shift arm 11 and wire 1
It is connected by 3.

Reference numeral 14 denotes a spring that biases the shift arm 11 toward the disengagement side of the clutch 10, and serves as a biasing force that maintains the rotary lever 5 in an unstable state.

Therefore, if the rotary lever 5 is swung to the forward engagement position a, the clutch 1'' will be in the engaged state (see Figure 4), and if the rotary lever 5 is swung to the rear off position, the clutch 10 will be in the disengaged state (see Figure 2). , so that the rotary device B is configured to be switched between activation and deactivation.

Further, as described below, the rotary lever 5 is forcibly shifted from the engagement position a to the cutting side automatic transition position C beyond the unstable switching dead center P as described below as the tiller main body A shifts backward. It is configured.

That is, a reverse gear shift shaft 15 is pivotally supported in the transmission case 2, and a gear 16 spline-connected to the gear shift shaft 15 is controlled by a left/right swing operation of a forward/reverse shift lever 17 (see FIG. 1). A transmission mechanism is configured that switches between a forward state and a reverse state by moving in the axial direction via a shift fork 18 that moves left and right.

Further, at the end of the shift fork 18, a link 1 is provided which is electrically swung as the shift fork 18 moves backward.
9 is provided, and this link 19 and a link 20 which is rotatably connected around the same axis as the swing axis of the rotary lever 5 are interlocked and connected by a wire 21. With the reverse gear shift, the tip engagement pin 20' of the link 20 comes into contact with the lever 5, and the rotary lever 5
An interlocking mechanism U is configured to forcibly shift the switch from the entry position a to the automatic switching position C on the cut side beyond the unstable switching dead center P (see FIG. 3).

The above-mentioned automatic shift to the cut side position C is a position where the lever 5 is prevented from shifting to the cut side even though the unstable switching dead center P has been exceeded due to frictional resistance at the pivot point of the rotary lever 5. This refers to the position where the switch is released, and when the frictional resistance is extremely small, this automatic switching position to the cut side is a position extremely close to the dead center P of unstable switching.

In addition, within the range from the automatic disengagement position C of the lever 5 to the clutch disengagement position, even though the lever 5 has exceeded the disengagement shift position C, the clutch 10 continues to be in the engaged state (engaged state). There is an operation position range d in which the operation continues, that is, when the link 20 is swung with the reverse gear shift of the main body, when the lever 5 is swung to a position where it touches the locking pin 20'. The rotary clutch 1 is set to be in the engaged state (see FIG. 3), and by manually operating the lever 5 to this position range d, the clutch 1 is operated in the engaged state to enable reverse plowing.

Incidentally, the rotary clutch 1" is as shown in FIG.
It utilizes a system in which the mutually meshing parts are engaged through the inclined surfaces S and S that have a mesh-holding hand, and the tilling rotor 4 is operated underground by engaging the clutch 1 by operating the lever 5. Then, by operating the lever 5 to the clutch disengaged side, the engaged state of the clutch 10 is maintained while tilling resistance is acting on the tilling rotor 4, and the rotor 4 is moved to the ground for direction change. or float the rotor 4
When the tillage resistance unexpectedly jumps upwards and tillage resistance disappears,
The clutch lever is configured to automatically enter the disengaged state due to its biasing force on the disengaged side.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary clutch structure of a walk-behind cultivator according to the present invention, and FIG. 1 is a side view of the walk-behind tiller;
FIGS. 2, 3, and 4 are explanatory views of the operation of the rotary clutch structure, and FIG. 5 is a partially enlarged view of the rotary clutch structure. 5...Rotary clutch lever-110...
・-Low clutch, U... Interlocking mechanism, a
...Enter position, b...Cut position, C.
...Automatic transition position on the cut side, d...Operation position range, P...Unstable switching dead center.

Claims (1)

[Claims] 1. The rotary clutch lever 5 is configured to be able to shift freely between two positions, ie, an engaged position a and a disengaged position, and the rotary clutch lever 5 is configured to be able to shift freely between two positions, ie, an engaged position a and a disengaged position. An interlocking mechanism 22 is provided for forcibly shifting from position a to a cut side automatic transition position C beyond the unstable switching dead center P, and a clarification mechanism is provided within the range from the cut side opening transition position C to the clutch disengagement position. A rotary clutch structure for a walk-behind cultivator, characterized in that an operating position range d is provided for manual operation to the engaged state.