JPH077689Y2 - Power transmission device of management work machine for tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a power transmission device of a management work machine for a tractor.

[Prior Art] Generally, a three-point support type link mechanism has been put into practical use as a means for connecting various agricultural working machines to the rear part of a tractor.

This three-point support type link mechanism is an accessory device of each tractor manufacturer, and lower links are pivotally mounted on the rear lower part left and right side parts of the tractor, and the rear upper part left and right side parts of the tractor are rocked by hydraulic pressure. Oscillating arms projecting from the oscillating arms, and upper links pivotally projecting from the tip ends of the oscillating arms and the middle portions of the rear portions of the lower links, and the distal ends of the lower links on the left and right sides and the upper portion. It is configured so that it is pivotally connected at three points to the tip of the link, and various management work machines are movably attached and connected to the rear of the tractor.

Further, as a power transmission means to various management work machines, the power take-off shaft of the tractor and the input section of the management work machine are connected by a universal joint to allow the management work machine to move up and down.

[Problems to be solved by the invention] However, in a small management work machine, the distance between the power transmission shaft of the tractor and the input section of the management work machine is relatively short, so even if the management work machine is moved up and down. Since the difference in distance between the power take-off shaft and the input part of the management work machine, that is, the distance between the horizontal position where the management work machine is low and the position where the management work machine is raised is small, the slide part in the middle of the universal joint is used. Although it can be absorbed, in a large management work machine, the distance between the power transmission shaft and the input section of the management work machine becomes long, and in this case, the distance difference caused by the vertical movement of the management work machine is large. Even if the intermediate portion of the universal joint does not move away, the power transmission engaging distance, that is, the area of the power transmission portion becomes small, which causes a disadvantage of unstable transmission.

[Means for Solving the Problems] The present invention is intended to solve these inconveniences. Referring to the accompanying drawings, the gist thereof is to manage the rear part of a tractor through a three-point support type link mechanism. A work machine is movably connected, and a power take-off shaft of the tractor and an input section of the management work machine are connected to each other. The power transmission shaft can be freely rotated on the management work machine side with the axis line in the front-back direction. And a hexagonal engagement hole is formed in the power transmission shaft, and a hexagonal rod-shaped slide shaft is fitted in the engagement hole so as to be slidable in the axial direction of the power transmission shaft. Is installed on the front side of the tractor side, and the power take-off shaft and the slide shaft are connected by a slidable universal joint, and power is transmitted to the power transmission shaft and the input portion. Consists of forming the output part of the transmission mechanism It is in the power transmission of the management work machine for tractors.

[Embodiment] In the three-point support type link mechanism 2 of the present embodiment, lower links 10 are pivotally mounted on the rear lower left and right side portions of the tractor 1, and rocked by hydraulic pressure on the rear left and right side portions of the tractor 1. The swinging arms 11 are provided so as to project, and the pulling links 12 are pivotally mounted on the tip ends of the swinging arms 11 and the middle portions of the lower links 10, and the upper portion is provided at the rear middle portion of the tractor 1. A link 13 is provided so as to project from the upper and lower ends of the lower link 10 on both left and right sides of the upper link 13.
Various management work machines 3 are attached to the rear part of the tractor 1 so as to be able to move up and down so as to be pivotally connected to each other at three points.

Further, in this embodiment, the work mounting frame 14 is supported by the three-point support type link mechanism 2, and the work mounting frame 14 is equipped with the management work machine 3.

Further, in this embodiment, a bearing base 15 is attached to the work mounting frame 14, and the power transmission shaft 6 is rotatably laterally installed on the bearing base 15 with a bearing 16 with the axial direction in the front-back direction. A hexagonal engaging hole 17 is formed in the hexagonal rod, and a hexagonal rod-shaped slide shaft 7 is fitted in the engaging hole 17 so as to be slidable in the axial direction of the power transmission shaft 6. A pressing spring 19 for pressing the slide shaft 7 forward, which is the tractor 1 side.
Has been installed.

The main end 8a of the universal joint 8 is fixed to the power take-off shaft 4, the rear end 8c is fixed to the slide shaft 7, and the intermediate part b is slidable by the action of the hexagonal hole and the hexagonal rod. Therefore, it is configured to be able to slide and expand.

The universal joint 8 is an accessory of the tractor maker.

Further, the transmission mechanism 9 of the present embodiment has the power transmission shaft 6 formed with the output portion 20 as a sprocket, and the management work machine 3
The sprocket 22 is fixed to the input shaft 21 of the input section of and the chain 23 is hung on the sprockets 20 and 22.

[Advantages of the Invention] As described above, the present invention arranges the power transmission shaft in the management work machine so as to be rotatable with the axis line in the front-back direction, and forms the hexagonal engagement hole in the power transmission shaft. A hexagonal rod-shaped slide shaft is slidably fitted in the engagement hole so as to be slidable in the axial direction of the power transmission shaft, and a pressing spring that can push the slide shaft forward toward the tractor is installed. Since the slide shaft is connected by a slidable and expandable universal joint, and the output part of the transmission mechanism for transmitting power to the input part is formed on the power transmission shaft, the management work machine is lifted by the three-point support type link mechanism. When it is moved, the slide shaft moves forward and backward by the non-rotating engagement action of the hexagonal hole-shaped engaging hole and the hexagonal rod-shaped slide shaft in order to absorb the change in the distance between the power take-off shaft and the management work machine caused by this Can slide, In addition, the universal joint can also slide and expand to absorb further changes in the distance between the power take-off shaft and the control work machine, and the power of the power take-off shaft can be reliably transmitted to the input section of the work machine. Since the engagement between the hexagonal rod-shaped slide shaft and the hexagonal hole-shaped engagement hole allows a large amount of power to be transmitted, smooth power transmission can be achieved. Since it is pushed forward in the barrel, the sliding movement of the slide shaft is smooth, the lifting movement of the management work machine is well done, and it is also possible to cope with the differences in the standards of the link mechanism and universal joint of each company, and it is possible to manage a wide range. It can be used for work machines.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an overall side view, FIG. 2 is an overall plan view, and FIG. 1 ... tractor, 2 ... three-point support type link mechanism, 3 ...
Management work machine, 4 …… Power extraction shaft, 5 …… Input section, 6 ……
Power transmission shaft, 7 ... Slide shaft, 8 ... Universal joint, 9 ...
… Transmission mechanism, 17 …… engagement hole, 19 …… Pressing spring, 20 ……
Output section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Minagawa, 1253, Hokkaido, Hokkaido, Yoshida-cho, Nishikanbara-gun, Niigata prefecture (56) References JP-A-52-74747 (JP, A) JP-A-48-4854 ( JP, A) JP 49-61540 (JP, A) Actually opened 55-34095 (JP, U) Actually opened 56-162328 (JP, U) Special public 43-4722 (JP, B1) Special public Showa 56-50125 (JP, B2) Showa 13-1012 (JP, Y1) Showa 52-57046 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A management work machine is movably connected to a rear portion of a tractor via a three-point support type link mechanism, and a power take-off shaft of the tractor is connected to an input section of the management work machine. A power transmission shaft is rotatably disposed on the management work machine side with the axis line in the front-rear direction, and a hexagonal engagement hole is formed in the power transmission shaft. A hexagonal rod-shaped slide shaft is formed in the engagement hole. Is slidably fitted in the axial direction of the power transmission shaft, a pressing spring is installed to push the slide shaft forward, which is the tractor side, and the power take-off shaft and the slide shaft are slidable and expandable. A power transmission device for a management work machine for a tractor, comprising a universal joint and an output portion of a transmission mechanism for transmitting power to the input portion formed on the power transmission shaft.