JPS5877951A - Power transmission gear for working machine - Google Patents

Abstract

PURPOSE:To enable the receiving of rotating power both from the front and rear of a working machine with one input shaft by allowing the reversal motion of the input shaft longitudinally with a driving bevel gear meshing a driven bevel gear. CONSTITUTION:A gear case 2 is provided on a rotary cover 1 and pipes 3 and 3' are provided on both the sides thereof 2. The pipes 3 and 3' are supported with supporting plates fixed on a base plate 4 and a chaincase 6 is mounted at the tip of one pipe while a supporting frame 7 at the end of the other pipe 3'. The gear case 2 is supported with both the pipes 3 and 3' through bearings 17 and 20 in such a manner as to be free to rotate in a plane perpendicular to the pipes 3 and 3. A driving bevel gear 24 of an input shaft 8 always meshes a driven bevel gear 22 of a transmission shaft 21 even when rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission and device for a working machine such as a rotary tiller that performs work using rotational power.

A rotary tiller is configured to carry out tilling work by rotating and pulling in a fixed direction a tilling shaft that has a plurality of tilling claws planted on its outer periphery.The rotary power is transmitted to the tilling shaft. The power is transmitted by a power transmission device having an input shaft connected to the PTO shaft of a tractor, which is a power agricultural machine. That is, the rotational power transmitted from the PTO shaft of the tractor to the input shaft is transmitted from the drive bevel gear provided at the rear end of the input shaft to the transmission shaft equipped with a driven bevel gear meshing with the drive bevel gear, and from this transmission shaft to the chain. Generally, the power is transmitted to a tilling shaft provided parallel to the transmission shaft via a transmission means such as the following.

On the other hand, it is desirable for rotary tillers to be able to switch the direction of rotation of the tilling shaft in both forward and reverse directions with respect to the traction direction depending on the field conditions. The direction of the tilling claws that are planted must be aligned in a certain direction, so in order to switch between forward and reverse rotation, it is necessary to switch the tilling claws in the opposite direction, which requires a lot of time and effort. required.

By making it possible to tow the tiller itself in the opposite direction while keeping the direction of rotation of the tiller shaft and the direction of the tiller claws constant, it becomes possible to use the tiller in both forward and reverse directions. However, for this purpose, there was a problem in that the input shafts had to be provided on both the front and rear sides of the tiller. In this case, the two O-drive A bevel gears had to mesh well with the driven bevel gear, making it difficult to adjust backlash.

The present invention has been made in view of the above circumstances, and provides a power transmission device that can receive rotational power from both the front and rear sides of a working machine using a single input shaft. This will be explained below.

The power transmission device for a working machine according to the present invention is characterized in that the input shaft can be reversed back and forth with the driving bevel gear meshing with the driven bevel gear. Embodiments of the present invention shown in the drawings will be specifically described below.

FIG. 1 is a perspective view of an example of a rotary tiller according to the present invention, in which a gear case 2 is provided on a rotary cover 1, and pipes 3, 3' are provided on both sides of the gear case 2. There is. Both pipes 3゜3' are supported by support plates 5, 5' fixed to a base plate 4, and a chain case 6 is attached to the tip of one pipe 3, and a chain case 6 is attached to the end of the other pipe 3'. A support frame 7 is attached to. An input shaft 8 is provided protruding from the gear case 2, and in use, the input shaft 8 is connected to a PTO shaft of a tractor via a universal joint. A tilling shaft 9 is provided on the lower side of the rotary cover 1, and a tilling claw 10 is attached to the tilling shaft 9. When using this tiller, the second
As shown in the figure, a tail wheel support frame 1 for supporting the tail wheel 11;
Necessary members such as a jack 13 and a mast 14 are attached in a predetermined direction and connected to the tractor by a link device 15.

The gear case 2 of this cultivator can be rotated 180 degrees along with the input shaft in the direction indicated by the arrow to reverse its direction.

FIG. 4 is a cross-sectional view of the main part, in which the support pipe 16 provided with a counter on one side of the gear case 2 is connected to the bearing 17. The pipe 3 is fitted onto the pipe 3 through the cylindrical portion 18 provided on the other side. The protrusion 19 of ' is fitted through a bearing 20. In other words, the gear case 2 has both pipes 3.3'
It is rotatably supported in a plane perpendicular to both pipes 3 and 3'. A hollow transmission shaft 21 is housed inside the pipe 3, and a driven bevel gear 22 is attached to the end of the transmission shaft 21 via a mounting member 21a. The driven bevel gear 22 is supported by a bearing 23. A driving bevel gear 24 that meshes with the driven bevel gear 22 of the transmission shaft is provided at the rear end of the input shaft 8, and the gear case 2 can be rotated with both bevel gears 22 and 24 meshing. On the right, an upper sprocket wheel provided inside the chain case 6 is attached to the tip of the transmission shaft 21, and is connected by a chain to a lower sprocket wheel attached to the tiller shaft 9. . From input shaft 8 to both bevel gears 22°24
The rotational power transmitted through the sprocket wheel and the chain is transmitted to the tilling shaft 9 to rotate it. FIG. 5 shows an example in which the gear case 2 is supported via bushes 25, 26 instead of the bearings 17, 20. The gear case 2 may be supported in any manner that allows it to be reversed forward and backward.

In Fig. 3, if the tiller shaft is rotated in the direction of arrow B and the entire tiller is pulled in the direction of arrow C, tilling in the forward rotation state (so-called down cutting) will be performed, but the gear case 2 will be reversed. If you pull it in the direction of the arrow while keeping the rotation direction the same, you can till it in the reversed state (
upcut) is performed. This makes it possible to perform tillage work that is appropriate to the field conditions.

In the power transmission device for a working machine according to the present invention, the input shaft can be used by reversing it back and forth with the driving bevel gear of the input shaft meshing with the driven bevel gear of the transmission shaft.
It is now possible to receive rotational power from both the front and rear sides of the working machine with a single input shaft, making it easy to switch between forward and reverse rotations of the working machine. Although the above description has been made using a rotary tiller as an example, it is clear that the present invention can be applied to other working machines that perform work using rotational power.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a rotary tiller to which the present invention is applied;
The figure is an explanatory view of the state of use, FIG. 3 is a side view of the main part, and FIGS. 4 and 5 are cross-sectional views of the main part showing different embodiments. Rotary cover, 2... Gear case, 3.3'...
Pipe, 6... Chain case, 8... Input shaft, 9
... Tilling shaft, 10 ... Tilling claw, 21 ... Transmission shaft, 22
... Driven bevel gear, 24... Driving bevel gear. Patent applicant: Iseki Agricultural Machinery Co., Ltd. Agent: Hiroshi Sugawara, patent attorney

Claims (1)

[Claims] (1) A drive bevel gear is provided at the rear end, and rotational power is transmitted from the input shaft whose front end is connected to the PTO shaft of the power agricultural machine to the transmission shaft via the driven bevel gear that meshes with the drive bevel gear. A power transmission device for a working machine that performs work using power, characterized in that the input shaft can be reversed back and forth while the driving bevel gear is meshed with the driven bevel gear. A power transmission device for a working machine.