JPS6026732B2 - Main clutch operating device in work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a belt transmission system that spans between an engine and a passive part having a main clutch such as a multi-disc clutch that controls power transmission to a traveling system and a working system. The present invention relates to a main clutch operating device for a working machine such as a tiller or a binder, which is equipped with an automatic tensioning mechanism for always keeping the belt of a belt transmission device in a tensioned state with no slack.

As mentioned above, the structure is such that engine power is switched on and off to load devices in the traveling system and work system using a tension clutch type that uses a tension device for the belt transmission device, but instead a multi-disc clutch separate from the belt transmission device. It is useful for work equipment equipped with a main clutch, such as, because it provides strong tension to the belt, making it easy to transmit power efficiently with little slippage, and making it easier to perform delicate clutch operations such as half-clutch operation. However, when starting the engine in this type of work machine, the following problems have occurred.

In other words, generally, the engine is started with the main clutch disengaged to release the transmission load of the driving system and work system to the engine, but even in this case, automatic tensioning of the belt transmission system between the engine and the passive parts is performed. Due to the existence of this mechanism, a load equivalent to the tension force of this belt transmission acts on the engine crankshaft, requiring a large operating force to start the engine, and a large amount of effort is required to start the engine with a recoil starter. Furthermore, when starting the engine with a starter motor, there is a problem that a starter motor with a larger capacity than necessary must be used. An object of the present invention is to make it possible to easily reduce the load at the time of starting the engine by effectively utilizing the operation odor of the main clutch that is inevitably used when starting the engine.

The characteristic structure of the present invention for achieving the above object is as follows:
Equipped with a belt transmission device in which an endless belt for transmission is stretched across a driving side rotating body that moves on the engine and a passive side rotating body that moves in conjunction with the load device side, and a tension theory that can be applied to the belt transmission device. a swinging arm having a body;
An automatic tensioning mechanism consisting of a spring that elastically biases this swinging arm in the belt tensioning direction via a connecting rod is provided, and the swinging arm is located downstream of the passive rotating body in the power transmission direction and at a position where the transmission speed is changed. In a work machine in which a main clutch is provided on a transmission upper side of the device, an interlocking mechanism for forcibly operating the automatic tension mechanism into a non-operating state is linked to an operating mechanism for operating the main clutch on and off. Additionally, the interlocking mechanism is provided with a flexible structure for causing the automatic tension mechanism to automatically follow the elongation of the belt, and this configuration provides the following effects.

In other words, since the exercise tool for forcibly bringing the automatic tension mechanism into a non-operating state is linked to the main clutch operating tool, the automatic tension mechanism can also be brought into a non-working state by using the main clutch operating tool. The automatic tension mechanism can be switched to a non-operating state with a simple structure using a single operating tool, and there is no need to change the operating smell. By releasing the load, it was possible to reduce the load when starting the engine.

Therefore, when starting the engine with a recoil starter, it can be started easily with little effort, and when starting the engine with a starter motor, it can be started reliably with a small-capacity starter motor. It has come to this.

If the main clutch and automatic tension mechanism are configured as an interlocking type in this way, the automatic tension mechanism that attempts to automatically follow the elongation of the belt will automatically follow the elongation of the belt due to the interlocking mechanism that is linked to the operating mechanism of the main clutch. However, the interlocking mechanism includes:
Since a flexible structure is provided to allow the automatic tensioning mechanism to follow the elongation of the belt, the main clutch and the automatic tensioning mechanism are configured as an interlocking type, and the elongation of the belt is absorbed. This enables efficient transmission with less slip. Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a pair of left and right running wheels 8, 8 mounted on the lower side of the rear end of a frame 7 on which an engine 1 is mounted.
A transmission (passive part) having a main clutch 2 such as a multi-disc clutch that controls power transmission to the tiller and tiller 9.
3 and the drive pulley 4A attached to the drive shaft IA of the engine 1 and the passive shaft 3A of the transmission 3.
A belt transmission device 4 is constructed by stretching an endless transmission belt 4C across a passive pulley 48 attached to the belt transmission device 4, and a tension wheel 5A that can be attached to the endless belt 4C. This figure shows a walk-behind cultivator equipped with a tension mechanism 5 consisting of a swinging arm 5B having a swing arm 5B and a spring 5D that elastically biases the swinging arm 5B in the belt tensioning direction via a connecting rod 5C. A control handle 1 extending rearward and upward from the upper end.
The main clutch 2 is connected to the operating wire 10a of the
11. A control lever 13 is provided which is turned on and off via a control rod 12, and the main clutch 2 is turned off when the main clutch 2 including the control lever 13, the control wire 11, and the control rod 12 is operated. At this time, an interlocking mechanism 6 for operating the automatic tension mechanism 5 into a non-operating state and an interlocking mechanism 15 for operating a brake 14 provided on the transmission 3 into an operating state are linked.

An interlocking mechanism 6 for operating the automatic tension mechanism 5 into a non-operating state is connected to the operating rod 1 as shown in FIG.
2 is pivotally connected to the clutch arm 2A of the main clutch 2, and the base end portion 5a of the swing arm 5A is pivotally connected to the base end portion 5a of the swing arm 5A through a flexible structure consisting of a pin 6B and a long hole 6C. Then, by moving the operating rod 12 when the main clutch 2 is disengaged and swinging the swinging arm 5B against the elastic biasing force of the spring 5D, the automatic tension is adjusted. It is configured to operate the mechanism 5 in a non-operating position.

The interlocking mechanism 15 that activates the brake is
As shown in FIG. A double nut 15B that is capable of pressing the elastic interlocking punch 15A when the main clutch 2 is disengaged is screwed together, so that the movement of the operating rod 12 is interlocked with the movement of the operating rod 12 when the main clutch 2 is disengaged. By pressing the elastic interlocking punch 15A in the pulling direction,
The brake 14 is configured to be actuated from a non-active state to an active state.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view of a walk-behind cultivator, and FIG. 1...Engine, 2...Main clutch, 3...Passive part, 4
...Belt transmission device, 5...Automatic tension mechanism, 6...Movement mechanism, 6B, 6C...
... Flexible structure, 11, 12, 13... Operation mechanism. Figure 1 Figure 2 Figure 2

Claims (1)

[Claims] 1 A belt transmission device 4 comprising an endless transmission belt 4C stretched across a drive-side rotary body 4A interlocked with an engine 1 and a passive-side rotary body 4B interlocked with a load device side. An automatic tensioning mechanism 5 is provided, which includes a swinging arm 5B having a tension wheel 5A that can come into contact with the belt, and a spring 5D that elastically biases the swinging arm 5B in the belt tensioning direction via a connecting rod 5C. At the same time, in a working machine in which the main clutch 2 is provided on the lower side in the power transmission direction than the passive rotating body 4B and on the transmission upper side than the transmission of the transmission 3, the main clutch 2 is operated to engage or disengage. operating mechanism 11 for
12 and 13 are linked with an interlocking mechanism 6 for forcibly operating the automatic tensioning mechanism 5 into a non-operating state, and the interlocking mechanism 6 is also provided with an interlocking mechanism 6 for automatically operating the automatic tensioning mechanism 5 in response to belt elongation. Flexible structure 6 for following
A main clutch operating device for a working machine, characterized in that it is provided with B and 6C.