JPS5920004Y2 - Connection structure of tractor mid-mount type work equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection structure for firmly connecting a mid-mounted working machine to the lower abdomen of a tractor.

Agricultural tractors are generally versatile enough to be equipped with many types of working machines.

It is well known that a working machine such as a mid-mounted mower is attached to the underbelly of such a tractor, but in order not to make the tractor a special machine, the working machine is attached removably and the winding power transmission is attached to the rear PTO shaft. The work machine is driven through a mechanism.

However, such work equipment moves while touching the ground, and when the work equipment moves up and down to follow the unevenness of the field surface, the vertical position of the pulleys may shift, which may cause the belt to come off. It may be damaged, making it difficult to transmit power.

Furthermore, in order to follow the field surface and to retract upward when traveling on the road, the work equipment is mounted on a suspension that can be moved up and down, but this suspension mechanism alone cannot handle the traction that is applied to the work equipment. It may not be possible to counteract the resistance, which may cause the implement to tilt undesirably or damage the lifting mechanism.
For this purpose, a member for attaching the working machine must be provided on the tractor body.

In view of these conventional problems, the present invention provides a power take-off device at the front of the tractor body, causes the PTO shaft to protrude rearward from the bottom of the power take-off device, and drives the work equipment via a universal joint shaft. At the same time, the lower part of the working machine is connected with a traction rod, and this traction rod is positioned on the side of the universal joint shaft and at approximately the same height, and the bent portions of both are brought close to each other in a side view. It is an object of the present invention to provide a connection structure for a mid-mount type working machine of a tractor, which enables strong traction of the working machine and smooth power transmission that follows the vertical movement of the working machine.

The features of the present invention to achieve this purpose are that a mid-mount type working machine is attached to the lower part of the abdomen of the tractor body so as to be able to move up and down, and a power take-off device is provided at the front of the Mauton body. A PTO shaft protruding rearward from a lower part of the working machine is interlocked with the input shaft of the working machine via a universal joint shaft, and a lower part of the power take-off device and the working machine are connected by a traction rod, wherein the traction The rod is located on the side of the universal joint shaft and at approximately the same height, and the front joint portion of the universal joint shaft is located near the front pivot pin of the traction rod in side view.

The invention will now be described in detail with reference to the illustrated embodiments.

In FIG. 1, 1 is a tractor body, and 2 is an engine mounted on the front part of the tractor body 1. In FIG.

Reference numeral 3 denotes a front axle bearing stand that supports the front axle, and is attached to the front part of the engine 2. A radiator 4 is mounted on this front axle bearing stand 3.
etc. are listed.

Reference numeral 5 denotes a crankshaft of the engine 2, which is capable of driving a radiator fan 7 and the like via a winding transmission mechanism 6, and is operatively connected to a front transmission shaft 9 via a clutch 8 for power on/off.

The front transmission shaft 9 is rotatably supported by the front vehicle bearing pedestal 3 with a bearing or the like, and the clutch 8 is separate from the engine clutch interposed between the engine 2 and the transmission.

Reference numeral 10 denotes a power take-off device, which includes a case 11 (a frame or a support plate that can support the shaft may also be used) that can be attached to and detached from the front vehicle bearing stand 3, and an inner part on the upper part of the case 11 to be attached to and detached from the front transmission shaft 9. and a pulley 12 fixedly mounted on the PTO shaft 3 on the PTO shaft 3 supported in the lower part of the case 11 parallel to the front transmission shaft 9 and protruding rearward. 14 and the belt 1 stretched between both pulleys 12 and 14
5, and its case 11 also serves as a work machine mounting member.

Reference numeral 16 denotes a mid-mounted mower, which includes a mower main body 18 suspended from the lower abdomen of the tractor body 1 via a suspension mechanism 17, and a cutting blade supported by the mower main body 18 via a rotating shaft 19. body 20 and an input shaft 2 interlocked with the rotating shaft 19
The mower main body 18 can be moved up and down to follow the unevenness of the ground via a gauge member 23, and can be lifted and lowered by a hydraulic device 25 via a lifting cable 24. It is possible.

The input shaft 21 is operatively connected to the drive shaft 13 via a universal joint shaft 27, and the universal joint shaft 27 has a middle portion that is expandable and retractable, and both ends that are bendable.

26 is a traction rod connecting the power take-off device 10 and the mower 16, and as shown in FIG. via a pin 31, and its rear end is connected to a bracket 3 erected on the mower main body 18 of the mower 16.
It is connected to 2.

This traction rod 26 is arranged on the side of the universal joint shaft 27, overlaps with each other in side view, and both have substantially the same height.

As is clear from FIG. 1, the pin 31 serving as the front pivot point of the traction rod 26 and the front joint portion (bending point) of the universal joint shaft 27 are close to each other, and the traction rod 26 and the universal joint shaft 27
This means that the mower 16 moves up and down in almost the same way, so even if the mower 16 moves slightly back and forth due to the up and down movement, the universal joint shaft 27 can follow it and move up and down.Furthermore, since it is extendable and retractable, it will not get twisted at all. This allows for smooth and reliable power transmission.

The traction rod 26 is attached to the power extraction device 10 to pull the mower 16, which is unstable only by being suspended by the suspension mechanism 17. It is supported by the device 10, and the mower 1
6 vertical movement (including elevating by the elevating cable 24),
Moreover, since the distance between the power take-off device 10 and the mower 16 is maintained substantially constant, unnecessary tensile force is prevented from acting on the universal joint shaft 27.

During lawn mowing work, lower the entire mid-mount mower 16 to ground the gauge member 23 as shown in Figure 1.
While driving the cutting blade body 20 by the power transmitted from the engine 2 through the front transmission shaft 9 and the power extraction device 10, the tractor body 1 is run to perform lawn mowing work. The power from shaft 9 is applied to pulley 1
2. The power is transmitted from the universal joint shaft 27 to the input shaft 21 through the belt 15, pulley 14, and PTO shaft 3.
Even when the mower main body 18 moves up and down due to the undulations of the ground, the universal joint shaft 27 only bends or expands and contracts, and the power is transmitted accurately.

If the grass is long, it will try to wrap around the universal joint shaft 27, but the traction rods 26 placed on the sides prevent it.

The power that drives the cutting blade body 20 is transmitted through the front transmission shaft 9 as described above.
Since the cutting blade 20 is taken out from the factory and does not pass through the engine clutch, even if the engine clutch is disengaged when changing gears, etc., the cutting blade body 20 remains in the normal driving state, and the finish of the cutting marks is also very good. .

To stop the mower 16, the clutch 8 may be disconnected.

In the above embodiment, the clutch 8 is interposed between the crankshaft 5 and the front transmission shaft 9, but as shown in FIG. Also good.

That is, a tension pulley 29 is pivotally supported by an arm 28 so as to be able to move toward and away from the belt 15, and is biased toward the belt 15 by a spring 35. For example, a wire 38 or the like can be controlled by an operating lever 37 attached to an instrument panel 36. The tension pulley 29 may be moved toward and away from the driver's seat 34 through the driver's seat 34.

In this way, there is no need to provide a special latch as in the previous embodiment, and the structure is very simple.

In this case, it is preferable that the operating lever 37 be detachably attached to the instrument panel 36, or that the wire 38 be detachable from the operating lever 37.

According to the present invention described in detail above, the mid-mounted work implement 16 is attached to the lower part of the abdomen of the tractor body 1 so as to be vertically movable, the power take-off device 10 is provided at the front of the tractor body 1, and the power take-off device 10 is PTO protruding rearward from the bottom
The shaft 13 and the input shaft 21 of the working machine 16 are connected to the universal joint shaft 2.
The tractor body 1
In addition to firmly towing the work implement 16 from the front side of the machine and transmitting power accurately, and omitting the member for attaching the traction rod 26 to the machine body 1, the traction rod 26 is attached to the side of the universal joint shaft 27 and Since they are located at approximately the same height and the front joint portion of the universal joint shaft 27 is located near the front pivot pin 31 of the traction rod 26 in side view, the work implement 16 being towed by the traction rod 26 is Even if there is a slight back and forth movement due to the vertical movement, the universal joint shaft 27 moves up and down almost in the same way as the traction rod 26, and there is almost no relative movement with the work implement 16, and the universal joint shaft 27 Smooth vertical movement following the work implement 16 and accurate power transmission are possible, and the traction rods 26 on the sides reduce the amount of grass entangled.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing another embodiment of the power take-off device. 1... Tractor body, 2... Engine, 8... Clutch, 9... Front transmission shaft, 10... Power take-off device , 13...P
TO axis, 18...Mitsudo mount mower 21.
...Input shaft, 26...Traction rod, 27...
...Universal joint shaft.

Claims (1)

[Scope of utility model registration request] A mid-mounted work machine 1 is installed below the abdomen of the tractor body 1.
A power take-off device 10 is provided at the front of the tractor body 1, and a PTO shaft 1 protrudes rearward from the lower part of the power take-off device 10. and the lower part of the power take-off device 10 and the work implement 16 are connected by a traction rod 26, in which the traction rod 26 is connected to the universal joint shaft 27.
, and the front joint portion of the universal joint shaft 27 is located on the side of the shaft and at approximately the shaft height, and the front joint portion of the universal joint shaft 27 is located at the front pivot pin 31 of the traction rod 26 in a side view.
A connecting structure for a mid-mount type working machine for a tractor, characterized in that it is located in the vicinity of a tractor.