JPS606183Y2 - Power transmission mechanism in mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission mechanism for a mower connected as an attachment to a tractor body, and more specifically to a power transmission mechanism when a mower is attached to the tractor body so as to be adjustable in distance.

When a mower is attached to the tractor body so as to be adjustable in distance, the power transmission method for the mower is usually a transmission shaft in which the power transmission shaft is formed into a rectangular cylinder shape;
The method used is to divide the transmission shaft into a rectangular rod shape, insert the two transmission shafts so that they can move forward and backward, and adjust the length by expanding and contracting the two transmission shafts. In various power transmission methods, when the power transmission shaft is extended and the insertion length between the two transmission shafts is shortened, there is slack in the connecting part (the center line of both transmission shafts is shortened). This sag causes problems such as rotational runout.

The present invention is an attempt to improve the conventional situation in view of the above-mentioned actual situation. In a power transmission mechanism that is installed so that both transmission shafts can be inserted freely and their length can be adjusted through the expansion and contraction of both transmission shafts, it is possible to prevent slack from occurring at the insertion and insertion portions of both transmission shafts, and to prevent rotational runout. , to enable smooth power transmission.

That is, in the present invention, a tapered spring is interposed in the insertion portion of both transmission shafts that are inserted so as to be able to move forward and backward, and the occurrence of the above-mentioned sag is prevented through the elastic force of the spring. The gist of the present invention is that a cylindrical supporting rod part is slidably inserted into a base rod part formed in a cylindrical shape, and a telescopic attachment forms a rod. For installation, a square shaft inserted into the base rod side is slidably inserted into a square tube inserted into the support rod side to form a power transmission shaft. The structure is such that a spring formed by winding in a tapered shape with a smaller diameter toward the direction of the square tube from the support rod is interposed between the tip of the rod and the tip of the square tube.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings.

In the drawing, 1 is the tractor body, 2 is the tractor body 1
The mower is shown connected to the front of the machine.

Reference numeral 3 indicates that the mower 2 connected to the front end of the tractor body 1 via a hitch 1' is attached to a rod;
is extended horizontally toward one side of the machine body 1, and the mower 2 is connected to the distal end of the mower 2 in a hanging shape.

Reference numeral 4 indicates an integral cover constituting the mower 2, 5 indicates a vertical shaft, and 6 indicates a cutter blade body.

In addition, for this installation, a support leg 7 extending in the front and back direction so as to ride on the mower 2 is connected to the tip of the rod 3, and the support leg 7 has three support wheels 8 at the front and rear parts. 8. Force the 8 to pivot.

Therefore, in the above-mentioned installation, the rod 3 is composed of a base rod part 9 located near the base and a branch part 10 located near the tip, and the branch part 10 is formed with a slightly smaller diameter with respect to the base rod part 9, By slidably inserting the support rod part 10 into the base rod part 9, the installation is performed so that the rod 3 can be expanded and contracted as desired.

In addition, the drive shaft 1 is attached to the base of the base rod part 9 that constitutes the rod 3.
1 is mounted on a shaft, and the drive shaft 11 is linked to the engine mounted on the tractor body 1 via an appropriate transmission mechanism, while a driven shaft 12 is mounted on the base of the support rod 10, and the driven shaft 1
2 is operated to be interlocked with the vertical shaft 5 via a suitable transmission mechanism.

Reference numeral 22 indicates a power transmission shaft that is fitted into the rod 3.

Its structure is as follows.

That is, a hexagonal prism-shaped square shaft 14 is connected to the drive shaft 11 via a universal joint 13, and the same square shaft 14 is connected to the drive shaft 11 via a universal joint 13.
is the supporting rod portion 10 inside the base rod portion 9 along its longitudinal center line.
It extends in the direction so that its tip part partially faces inside the support rod 10.

On the other hand, the cross-sectional shape of the inner diameter part of the driven shaft 12 is set to the square shaft 14.
A rectangular tube 15 formed in a hexagonal tube shape corresponding to the cylindrical tube 15 is connected via a universal joint 16, and the rectangular tube 15 extends inside the support rod 10 along its longitudinal center line toward the base rod 9. The rectangular shaft 14 is inserted into and inserted into the rectangular tube 15 so as to be freely inserted and removed.

A spring holder 17 is provided at the tip of the support rod 10.
is attached via a bearing 18, and between the holder 17 and the tip of the support rod 10, a spring 19 is spirally formed so that the diameter decreases from the tip of the support rod 10 toward the holder 17. It is made by intervening.

In other drawings, reference numeral 20 denotes a hydraulic device for slidingly adjusting the mower 2 toward one side of the tractor body 1;
Reference numeral 1 also indicates a hydraulic device for rotating the mower 2 in the vertical direction.

Next, its effect will be explained.

When the engine mounted on the tractor body 1 is driven, its power is transmitted to the drive shaft 11 through an appropriate transmission mechanism.

The power transmitted to the drive shaft 11 is further transmitted to the vertical shaft 5 via the universal joint 13, square shaft 14, square tube 15, universal joint 16, and driven shaft 12, and the cutter blade bodies 6, 6 This results in rotational drive.

On the other hand, the hydraulic device 20 is operated to connect the support rod 1 from the base rod 9.
By adjusting the protrusion length of 0 as appropriate, installation is possible with rod 3.
The overall length can be expanded or contracted arbitrarily.

In such an attachment, the attachment position of the mower 2 to the tractor body 1 can be adjusted through expansion and contraction of the rod 3.

In addition, as mentioned above, as the rod 3 is adjusted for expansion and contraction, the square shaft 14 inserted into the rod 3 has its tip end slid appropriately within the square tube 15. The above mounting corresponds to the rod 3, so that its length can be adjusted automatically.

However, as mentioned above, the installation involves adjusting the expansion and contraction of the square tube 15 and the square shaft 14 in correspondence with the adjustment of the expansion and contraction of the rod 3. Especially when the installation is made to act in the direction of extending the rod 3,
This results in a reduction in the length of the square tube 15 into which the tip end portion of the square shaft 14 is fitted.

As described above, the insertion allowance of the square shaft 14 into the square tube 15 is reduced, causing slack in the engaging portion, which impedes smooth power transmission.
In the present invention, by interposing the spring 19 between the tip of the support rod 10 and the tip of the square tube 15 as described above, the engagement between the square shaft 14 and the square tube 15 as described above is achieved. This makes it possible to control sagging in parts.

The present invention has the above configuration, and as described above, the support rod part 10 is slidably inserted into the base rod part 9 to form the rod 3, which is extendable and retractable. Within 3,
The tip of the square shaft 14 inserted into the base rod part 9 side is connected to the support rod part 1.
A power transmission shaft is formed by slidably fitting the tip of the square tube 15 inserted into the zero side, and a support rod is provided between the tip of the support rod 10 and the tip of the square tube 15. A spring 19 is provided by winding the spring 19 so that the diameter becomes smaller from the tip of the section 10 toward the tip of the rectangular tube 15.
By supporting the engaging portion of the square tube 15 and the square shaft 14 through the elastic action of the rod 9, the installation can be performed without any hindrance to the expansion and contraction of the rod 3. This made it possible to control sagging in the joint area.

As a result, it was possible to prevent the occurrence of rotational runout in the rotating part, and it became possible to obtain a smooth power transmission effect.

[Brief explanation of drawings]

FIG. 1 is a plan view of a mower according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an enlarged sectional view of the main parts. 1...Tractor body, 1' song...Hitsuchi, 2...
...Mower 3...Mount with rod, 4...
...Cover integrated, 5... Vertical axis, 6...
Cutter blade body, 7... Support leg, 8... Support ring, 9... Base rod part, 1o... Support rod part, 11... ... Drive shaft, 12 ... Driven shaft,
13・・・Universal joint, 14・Song・
Square shaft, 15... Square tube, 16... Universal joint, 17... Spring holder, 18... Bearing, 19... Spring, 20... Hydraulic device, 21... Hydraulic device, 22... Power transmission shaft.

Claims (1)

[Scope of utility model registration request] A cylindrical support rod is slidably inserted into a cylindrical base rod to form a telescopic attachment, and the same attachment is inserted into the base rod on the side of the base rod. A power transmission shaft is formed by slidably inserting the square shaft into a square tube inserted into the support rod side, and a support rod is inserted between the tip of the support rod and the tip of the square tube. A power transmission mechanism in a mower that uses a spring wound in a tapered shape so that the diameter becomes smaller toward the rectangular cylinder.