JPS5912B2 - Kusakaliki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mower for cutting grass, weeds, etc., and in particular, to an improvement in a type of mower mounted on a tractor body as a side projecting type. What makes this possible is that when the mowing section hits an obstacle, the range in which it retreats to the rear can be increased, and even when the mowing section is retreated this far, accurate and quiet power transmission can be ensured. In order to achieve this object, the present invention provides a mower that is attached to the tractor body in a side-extended manner, and includes a main frame equipped with a first gear case for receiving and receiving power from the PTO system of the tractor; a reaping section equipped with a second gear case for transmitting power to the reaping blade; and a power transmitting universal joint having both ends connected to the output shaft of the first gear case and the input shaft of the second gear case, respectively. a joint shaft; and a four-bar link for connecting the reaping section to the main frame so that the reaping section can be retracted rearward, and the four-bar link is configured such that both ends of the joint shaft are freely movable when the reaping section is retracted rearward. The bending angle between the output shaft and the input shaft of the joint is configured to be approximately equiangular.

Conventionally, tractor mowers equipped with a safety device that retracts the mowing section backwards when the mowing section encounters an obstacle have been developed, for example, by Japanese Patent Publication No. 31-370.
It is known from Publication No. 8.

In this conventional example, the reaping section is mounted so as to be rotatable around the vertical axis, and the power transmission to the reaping section is comprised of a winding transmission using a belt, and a crank arm and a connecting rod on the output side of the winding transmission. A joint shaft is provided on the input side of the winding transmission to connect it to the tractor body.

However, according to this conventional example, when the reaping section moves backward, the angle of the universal joint between the input shaft of the winding transmission and the joint shaft becomes larger than the angle of the universal joint between the PTO shaft and the joint shaft. If the reaping section is driven as it is, there will be noise due to the non-uniform movement of the universal joint, and therefore there is a limit to how far the reaping section can be moved backward.

That is, in this conventional example, the reaping section is connected to the machine frame on the fixed side so as to be rotatable about the vertical axis, and the reaping section is equipped with a power transmission mechanism, so there is the above-mentioned problem. .

Therefore, if a power receiving part from the PTO shaft is provided in the fixed side machine frame and the reaping part is connected to the machine frame separately from the power receiving part so as to be rotatable around the vertical axis, the above-mentioned conventional method can be solved. It seems that the problems mentioned in the example can be resolved.

However, if the power receiving part on the machine frame side and the reaping part side are wound together for transmission, the winding transmission will be disconnected when the reaping part is retracted, and it is still not possible to obtain a large amount of retraction of the reaping part.

In addition, if the aforementioned power receiving part and the reaping part side are connected by a joint shaft having a universal joint part at both ends, when the reaping part moves backward, the universal joint part on the power receiving part side and the universal joint part on the reaping part side will be connected. The bending angles are different, causing nonuniform motion, and this also has a development in terms of noise.

The present invention has been improved so that the reaping section can be largely retracted and accurate and quiet power transmission can be ensured even in this retracted position. Although this will be described in detail as a mower, the same applies to a front mower.

In FIGS. 1 and 2, reference numeral 1 denotes a tractor body, and a mower 3 is attached to the rear of the tractor body 1 via a three-point link 2.

The mower 3 protrudes from one side at the rear of the tractor body 1, and although the illustrated example shows a rotary type mower, it may also be a reciprocating type.

Reference numeral 4 denotes a main frame, and the center thereof is provided with a first gear case 5 lined with heher gear. 1 A joint shaft 6 is connected between the first gear case 5 and the rear PTO shaft of the tractor body 1. ing.

Reference numeral 7 denotes a reaping section in which four-speed rotary canters 8 are arranged side by side, and the inner end thereof is provided with a second gear case 9 in which, for example, a spur gear is lined.

As is well known, the inner sole 10 and the outer sole 11
, a grass collection board 12 and a grass collection rod 13.

Reference numeral 14 denotes a joint shaft for power transmission interposed between the first gear case 5 and the second gear case 9, the length of which is extendable and retractable, and universal joints 15 shown in cross shapes are provided at both ends of the joint shaft. 16 is provided, and the universal joint 15 is connected to the output shaft of the first gear case 5.

The adjustable joints 16 are respectively connected to the input shafts of the second gear case 9.

Numeral 17 is a four-bar link which connects the reaping section 1 to the main frame 4 so that it can move backward around the vertical axis.The four-bar link 17 is constructed as follows.

That is, the first bracket 7 extending rearward from the main frame 4
H8 is provided, and a second bracket 10 is provided using the first gear case 5 of the main frame 4.

On the other hand, there are also third brackets 20 before and after the second gear case 9.
and a fourth bracket 21 are provided, and the first bracket 18 and the fourth bracket 21 are pivotally connected by a link 22 22a, 22
b, and the second bracket 19 and the third bracket 2
0 are pivoted at links 23, 23a and 23b, and each link 22, 23 is crossed as shown in the first figure.

Furthermore, a check bar 24 made of a bending link is connected between the link 22 midway and the main frame 4, and this bar 2
In normal operation, the bent portion of 4 is stopped by a stopper 26 through the elastic force of a spring 25.

When the reaping section 7 is in the normal position shown in FIG. 1 and hits an obstacle, the four-bar link 17 will
Links 22 and 23 with 2a and 23a as fixed points, respectively.
Even when the reaping part 7 is retracted backwards due to bending, the bending angle of the universal joint parts 15 and 16 of the joint shaft 14, that is,
The bending angle α1 of the universal joint part 16 with respect to the output shaft of the first gear case 5 and the bending angle α2 of the universal joint part 16 with respect to the input shaft of the second gear case 9 are made to be approximately equal angles,
The range when the reaping section 7 is retreated as shown by the chain line in FIG. It may be possible to adjust it by

To explain the operation of the embodiment of the present invention configured as described above, when the reaping section I hits an obstacle while being driven in posture A in FIG. 1, the entire reaping section 7 is affected by the impact. tries to retreat as shown by the arrow, but in this case, a joint shaft 14 that can extend and contract in the axial direction is used to transmit power to the reaping section 7.
Considering that the main frame 4 and the reaping section 1 are connected by the four-bar link 17, even if the reaping section 1 is retracted far backward, the reaping section 7 can be connected to the main frame 4 by the four-bar link 17. It can be stably supported, and even if the reaping section 7 encounters an obstacle, the impact will be alleviated.

As described above, even if the reaping section 7 is moved backward significantly, the bending angle α1 of the universal joint 15 with respect to the output shaft of the first gear case 5 of the joint shaft 14 and the joint shaft 14
The bending angle α2 of the universal joint 16 with respect to the input shaft of the second gear case 9 should be approximately equiangular (since the reaping section I is supported on the main frame 4 by the four-bar link 17, the reaping section 7 should be Even if the reaping section 1 continues to be driven via the joint shaft 14 when the mower is moved backward, the noise and vibration of the joint shaft 14 are small and accurate power transmission can be ensured.

This invention is as described above, and when the reaping section hits an obstacle, even if the reaping section is moved back greatly,
The cutting section can be stably and reliably supported by the main frame via a four-bar link.

When the reaping section is retracted in this way, the bending angle of the universal joint of the joint shaft with respect to the output shaft of the first gear case provided on the main frame and the joint with respect to the input shaft of the second gear case provided on the reaping section side. Since the bending angles of the shaft and the bending angle of the universal joint are approximately equal to each other, it is possible to ensure accurate power transmission when driving the reaping section via the joint shaft. It has advantages and is very profitable.

[Brief explanation of drawings]

The drawings show an example of the present invention, and FIG. 1 is a plan view thereof, and FIG.
The figure is a partially enlarged rear view. 1...Tractor body, 3...Mower, 4...Main frame, 5...First gear case, 1...Mowing section, 9...Second
Gear case, 14...Joint shaft, 17...
...4th section link.

Claims (1)

[Claims] 1. In a grass mower attached to the tractor body as a side projecting type, there is a main frame equipped with a first gear case for receiving and receiving power from the PTO system of the tractor; a reaping section equipped with a second gear case for transmitting power; a joint shaft for power transmission having universal joints at both ends connected to the output shaft of the first gear case and the input shaft of the second gear case; A four-bar link for connecting the reaping part to the main frame so that it can be retracted backward;
The mower is characterized in that the joint link is configured such that when the reaping part is retracted rearward, the bending angles of the output shaft and input shaft of the double-end adjustable joint on the joint shaft are approximately equal.