JPH0117128Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to a tilling pawl attachment device for a rotary work machine that switches the rotation of a tilling shaft between a forward rotation direction and a reverse rotation direction.

Technical background of the invention and its problems Conventionally, rotary work machines have a power transmission system that extends from the drive unit to the tilling shaft to which the tilling claw is attached. Some have a tilling shaft rotation direction switching section that switches between the two directions, and down cutting is performed by rotating the tilling shaft in the forward direction, and up cutting is performed by rotating the tilling shaft in the reverse direction. Therefore, the tilling claws are fixedly attached to the tilling shaft with the tip side retracted with respect to the rotation direction of the tilling shaft, and therefore the direction of rotation of the tilling shaft can be changed from normal rotation to reverse rotation or from reverse rotation to normal rotation. When switching to rotary rotation, it is necessary to change the tilling claws in the opposite direction or to reverse the left and right mounting positions of the tilling shaft, which is very time-consuming.

Purpose of the invention This invention was devised in view of the above points, and provides a tilling claw attachment device that can easily switch between forward cutting for down cutting and reverse rotation for up cutting without having to replace the tilling claw or tilling shaft. The purpose is to obtain.

Summary of the invention In this invention, a plurality of tilling claw attachments each having a pair of supporting parts facing each other with a mounting space of a predetermined size are attached to a tilling shaft that can freely rotate in forward and reverse directions around its axis. A tilling claw with tilling blades formed on both edges in the front and back direction and a pressing body elastically connected to the side surface of the tilling claw are installed in this mounting space, and the tilling claw is rotated in the rotational direction of the tilling shaft. By making it possible to swing freely along the axis and regulating the range of swing by the regulating part provided on the tilling claw attachment,
Just by switching the direction of rotation of the tilling shaft, the direction of the tilling claws is automatically changed to the direction suitable for that rotation direction, and the tilling claws are used when switching the rotation direction from forward rotation to reverse rotation or from reverse rotation to forward rotation. In addition, the pressing body that elastically connects to the side of the tilling claw reduces the impact when the tilling claw connects to the regulating part, and also reduces the play of the tilling claw during work. In addition, the installation space is set wider than the width of the tilling claws and the pressing body, so that the tilling claws and the pressing body can be easily attached.

Embodiment of the invention An embodiment of the invention will be described based on the drawings. A rotary working machine 3 is connected to the rear of the tractor 1 by a three-point hitch mechanism 2. One end of a power transmission shaft 5 of a rotary work machine 3 is connected to a PTO shaft 4 connected to an engine (not shown) of a tractor 1 serving as a drive unit and extending rearward via an intermediate shaft (not shown). ing. A bevel gear 7 is fixed to the other end of the transmission shaft 5 in a transmission case 6, and the bevel gear 7 has a pair of left and right clutch pawls rotatably supported in the transmission case 6 via a bearing 8. Bevel gears 9 and 10 are engaged. An intermediate shaft 11 is provided rotatably around the axis, passing through the centers of the bevel gears 9 and 10 with clutch pawls and extending outside the transmission case 6. A slider 12 is fitted with a spline so that it can slide freely. Furthermore, the transmission case 6
A fork 13 that engages with the clutch pawl slider 12 and a shaft 14 that fixes the fork 13, has an axis parallel to the intermediate shaft 11, and is slidable in the direction of the axis, An operating lever 15 for sliding the shaft 14 and fork 13 is connected to the end of the shaft 14 that projects outside the transmission case 6. These bevel gears 7, bevel gears 9 and 10 with clutch claws, slider 12 with clutch claws,
The fork 13, the shaft 14, the operating lever 15, and the like constitute a tilling shaft rotation direction switching section 16.

One ends of cylindrical support pipes 17 and 18 are fixed to the left and right sides of the transmission case 6, and a chain case 19 is fixed to the other end of one support pipe 17.
is fixed, and a side plate 20 is fixed to the other end of the other support pipe 18. The intermediate shaft 11 passes through the support pipe 17 and extends into the chain case 19, and a sprocket 21 is fixed to the end of the intermediate shaft 11 located inside the chain case 19. Further, the chain case 19
A tilling shaft 22 having an axis parallel to the intermediate shaft 11 is rotatably supported between the side plate 20 and the side plate 20, and one end of the tilling shaft 22 located inside the chain case 19 A sprocket 23 is fixed to the sprocket 23, and a chain 24 is wound between the sprocket 23 and the sprocket 21.

A plurality of tilling pawl attachments 27 are arranged and fixed along the axial direction of the tilling shaft 22, each having a mounting space 25 of a predetermined size along the axial direction and having a pair of opposing support parts 26. ing. In the mounting space 25, tilling blades 28 are provided at both ends in the front and back direction.
A tilling claw 29 formed with a leaf spring 30 as a pressing body
are attached, and these tilling claws 29 and leaf springs 30
This means that the tilling claw 29 can swing freely around its axis by means of a stepped bolt 31 whose axis is parallel to the axis of the tilling shaft 22, and the leaf spring 30 can be elastically attached to the side surface of the tilling claw 29. It is supported while being joined to. A stopper 32, which is a regulating portion for regulating the swinging range of the tilling claw 29, is welded to the tilling claw attachment 27. Further, the width dimension of the mounting space 25 is set to be wider than the width dimension determined by the free thickness of the leaf spring 30 and the thickness of the tilling claw 29.

In such a configuration, driving force from the engine is transmitted to the bevel gear 7 via the PTO shaft 4, transmission shaft 5, etc., and the bevel gears 9 and 10 with clutch claws that mesh with the bevel gear 7 rotate in opposite directions. By operating the operating lever 15, the slider 12 with a clutch pawl is slid, and the clutch pawl 33 of the slider 12 with a clutch pawl is moved to the clutch pawl 34 of one of the bevel gears 9, 10 with a clutch pawl.
The intermediate shaft 11 rotates integrally with the bevel gears 9 and 10 with clutch claws, and the rotation of the intermediate shaft 11 is controlled by the sprocket 21 and the chain 2.
4. It is transmitted to the tilling shaft 22 via the sprocket 23, and the tilling shaft 22 rotates around its axis. Note that the clutch pawl 33 is connected to the bevel gear 9 with a clutch pawl.
The direction of rotation of the intermediate shaft 11 is opposite when it is engaged with the clutch pawl 34 of the bevel gear 10 and when it is engaged with the clutch pawl 34 of the bevel gear 10 with a clutch pawl, and therefore the direction of rotation of the tilling shaft 22 is also opposite. Become.

When the tilling shaft 22 rotates, the tilling claws 29, which are swingably supported by the stepped bolts 31, step into a state in which the tips of the tilling claws 29 are retracted backward in the direction of rotation due to the action of cutting into the ground. It rotates around the axis of the attached bolt 31, and this rotational movement is regulated by the tilling claw 29 being joined to a stopper 32 in the rotation direction. Further, a leaf spring 30 is elastically connected to the tilling claws 29 to prevent play of the tilling claws 29, and therefore, generation of noise due to play of the tilling claws 29 during operation is prevented.

Next, operate the operating lever 15 to turn the tilling shaft 22.
When the tiller claws 29 are rotated in the opposite direction, the tiller claws 29 are rotated to be connected to the other stopper 32, and the leaf spring 30
This prevents play. In this way, tilling claw 2
Switching between down-cutting and up-cutting can be easily performed without replacing the parts 9, etc., and the leaf spring 30 can prevent noise during the work. Furthermore, the leaf spring 30 alleviates the impact when the tilling claw 29 is joined to the stopper 32 when the rotation direction is changed, thereby improving the durability of the tilling claw 29 and the tilling claw attachment tool 27. Note that the mounting space 25 of the tilling claw attachment device 27 is wider than the width dimension of the leaf spring 30 and the tilling claw 29, so the tilling claw 2
9 and the leaf spring 30 can be attached and detached very easily.

Note that FIGS. 6 and 7 show modified examples of this embodiment, and the step of the stepped bolt 31 may be reduced by one step as shown in FIG. A counterbore 35 slightly larger than the diameter of the leaf spring 30 is formed on the side surface of the tiller claw 29, and this counterbore 3
By attaching the leaf spring 30 to the blade 5, the tilling claws 29 and the leaf spring 30 can be more easily installed in the mounting space 25.

Effects of the invention Since this invention is configured as described above, it is possible to immediately switch between down-cutting and up-cutting by simply changing the direction of rotation of the tilling shaft without replacing the tilling claws, etc. The pressing body elastically joined to the side surface of the claw prevents the tiller claw from playing and generates noise during operation, and also allows the tiller claw to be connected to the regulating part when changing the rotation direction. The durability of the tilling claw and tilling claw attachment device can be improved by alleviating the impact, and since the mounting space is set wider than the width of the tilling claw and the pressing body, it is easy to attach and detach the tilling claw and the pushing body. It has the following effects:

[Brief explanation of drawings]

The drawing shows one embodiment of this invention.
Figure 2 is a side view of the entire system, Figure 2 is a partially sectional plan view of the power transmission system, Figure 3 is a longitudinal sectional front view before the tilling claws and leaf springs are installed, and Figure 4 is a front view of the power transmission system.
The figure is a longitudinal sectional front view of the tilling claw and leaf spring in the installed state, FIG. 5 is a longitudinal sectional side view thereof, FIG. 6 is a longitudinal sectional front view showing the first modification of this embodiment, and FIG. It is a longitudinal sectional front view showing a second modification of . 3... Rotary work machine, 16... Tilling shaft rotation direction switching unit, 22... Tilling shaft, 25... Mounting space, 26... Support part, 27... Tilling claw attachment tool, 2
8... Cultivating blade, 29... Cultivating claw, 30 Leaf spring (pressing body), 32... Stopper (regulating part).

Claims (1)

[Scope of utility model registration request] A rotary work machine having a tilling shaft rotation direction switching section for switching the rotation direction of the tilling shaft in the opposite direction in a power transmission system that transmits the driving force from the drive section to the tilling shaft rotatable around the axis, wherein the tilling shaft A plurality of tilling claw mounts each having a pair of opposing supporting parts having a mounting space of a predetermined size along the axial direction of the tilling shaft are disposed along the axial direction of the tilling shaft, and are provided on both ends in the front and rear direction. A tilling claw formed with a tilling blade is mounted in the mounting space so as to be able to swing freely along the rotational direction of the tilling shaft and to be able to move toward and away from a regulating portion provided on the tilling claw mount that regulates the range of swing thereof. In addition, a pressing body elastically joined to the side surface of the tilling claw is mounted in this mounting space, and the mounting space is set wider than the width dimension of the tilling claw and the pressing body. Claw attachment device.