JPH0321122B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tractor-mounted mower device,
A mower attached to the rear of the tractor via a three-point linkage mechanism can freely follow the slope of the ground in the front, rear, left, and right directions.

[Conventional technology]

There are two types of mowers that are attached to a tractor: those that are attached to the underbelly of the tractor and those that are attached to the rear of the tractor.The former is relatively small and the latter is large. There are many.

In the case of the latter type, which is attached to the rear of the tractor,
Naturally, a three-point linkage mechanism at the rear of the tractor is used to tow and attach the mower to the rear of the tractor via this three-point linkage mechanism. When mowing a lawn, etc., the front and rear gauge wheels of the mower are placed on the ground, and the mower is towed by a tractor while following the undulations, slopes, etc. of the ground.

[Problem that the invention seeks to solve]

However, in the past, the top link of the three-point linkage mechanism and the rear ends of the pair of left and right lower links were simply connected to the mower side. Although it could move, it was unable to tilt forward, backward, left or right, and its ability to follow the ground was poor.

That is, the pair of left and right lower links of the three-point linkage mechanism are normally connected via lift rods to the pair of left and right lift arms of the hydraulic system for lifting and lowering the work equipment provided on the tractor, and the pair of left and right lift arms The arms are designed to move up and down integrally around the same axis. Therefore, even if the hydraulic system is used in a floating state where it can be moved up and down during work, the left and right lower links simply move up and down, and the left and right lower links do not move up and down separately. The range in which the mower can follow the horizontal inclination of the ground is limited to the amount of mechanical play in the connecting portion. In addition, since the lengths of the top link and lower link remain unchanged, the front and back inclination of the mower is limited to the amount of mechanical play in the connecting parts, and it is possible to actively follow the inclination of the ground in the front and rear direction. I can't.

Therefore, in the past, if the ground where the tractor and mower were located was sloped back and forth or left and right, the mower could not completely follow the ground, resulting in uneven mowing heights for lawns, etc. It had some drawbacks.

The present invention is intended to solve these conventional problems, and its first objective is to prevent mowers from tilting in all directions, from front to back and from left to right on the ground.
The purpose is to make the tracking ability followable freely.

A second object of the present invention is to smooth the operation during tracking.

A third object of the present invention is to enable the mower to be lifted via a three-point linkage mechanism while improving followability of the mower.

[Means for solving problems]

As a specific means for solving the above-mentioned problems and achieving the above-mentioned object, the present invention provides a mower 5, which follows the mower 5 with its front and rear gauge bodies 11 and 12 in contact with the ground, which is attached to a tractor. In a tractor-mounted mower device which is towed and mounted behind a three-point link mechanism 17, an upper connecting link 24 is connected between the top link 18 of the three-point link mechanism 17 and the mower 5 side in pairs on the left and right. A lower connecting link 27 is interposed between the lower link 19 and the mower 5 side so as to be pivotable in the vertical direction, and a limiting means 33 is provided to limit the pivoting range of the lower connecting link 27. A pair of left and right front gauge bodies 11 are provided near the lower connecting link 27, and a rear gauge body 13 is provided at the left and right center.

[Effect]

When the mower 5 is towed by the tractor 1 during work, the upper connecting link 24 and the lower connecting link 27 pivot in the vertical direction when the gauge bodies 11 and 13 travel on slopes or undulating areas. The mower 5 follows the ground by the single or combined movement of the connecting links 24, 27. Therefore, the rotary blade 7 can reap uniformly without causing irregularities.

〔Example〕

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

In Figures 1 and 2, 1 is a tractor;
It has a rear wheel 2, a hydraulic system 3 for lifting and lowering the work equipment, a driver's seat 4, etc. Reference numeral 5 denotes a mower, which includes a mower deck 6, a plurality of rotary blades 7 rotating around a vertical axis, and the rotary blades 7.
The rotating blade 7 is driven by power transmitted from the PTO shaft 9 of the tractor 1 via the universal joint 10 and the winding transmission mechanism 8. The mower deck 6 is provided with a pair of left and right front gauge wheels 11 on the front side so as to be swingable via a bracket 12, and a rear gauge wheel 13 is provided on the left and right center portions of the rear side. ing. These gauge wheels 11, 13 are for regulating the cutting height by the cutting blade 7, and during work, these gauge wheels 11, 13 can run while touching the ground. A pair of left and right support brackets 14 are provided on the front side of the mower deck 6, and a top mast 15, a support link 16, etc. are provided in the center. Reference numeral 17 denotes a three-point linkage mechanism for towing and mounting the mower 5 behind the tractor 1, and is composed of a top link 18 and a pair of left and right lower links 19. 21. The top link 18 has a ball joint 22 at its rear end, as shown in FIGS. 3 and 4, and this ball joint 22 is connected to an upper connecting link 24 via a mounting pin 23. The upper connecting link 24 is the top mast 1
5 is connected to the upper end via a mounting pin 25,
Therefore, the upper connecting link 24 is connected to the mounting pins 23 and 25.
It can pivot freely. In addition, the mounting pins 23, 25
It can be inserted freely. Pair of left and right lower links 19
Each of the ball joints 26 has a ball joint 26 at its rear end.
is detachably connected to the mounting pin 28 of the lower connecting link 27. The lower connecting link 27 is provided with a cylindrical boss portion 29 at the intermediate portion in the front-rear direction, and this boss portion 29 is rotatably fitted onto a horizontal shaft 30 that connects the support bracket 14 and the support link 16. Therefore, the lower connecting link 27 is also pivotable about the mounting pin 28 and the transverse axis 30 relative to the lower link 19 and the support bracket 14. An engagement pin 31 is provided at the rear end of the lower connecting link 27, and the engagement pin 31 is slidably fitted into a long hole 32 formed in the support bracket 14.
The pivot range of the lower connecting link 27 relative to the support bracket 14 is restricted within the range of the elongated hole 32. Note that the regulating means 3 is controlled by the engaging pin 31 and the long hole 32
3 are made up. In the embodiment, the connecting links 24 and 27 are provided on the mower 5 side so that it can be attached to various types of tractors. Support bracket 14
are located near the inner side of the front gauge wheel 11, and the pair of left and right lower connecting links 27 and the front gauge wheel 11 are located at approximately the same position in the front-rear direction, but slightly shifted from side to side. placed in position. Further, the upper connecting link 24 is located in the center between the left and right pair of lower connecting links 27 and at approximately the same position in the front-rear direction, so that the upper connecting link 24 and the lower connecting link 27 of the front gauge wheel 11 are approximately in the same position in the left-right direction. They are arranged in a straight line.

In the above configuration, during lawn mowing work, the hydraulic device 3 is placed in a floating state, and each rotary blade 7 is rotated while the mower 5 is towed by the tractor 1 via the three-point linkage mechanism 14. The blade 7 cuts the lawn at a predetermined cutting height. In this case, as shown in FIG. 5, even if the tractor 1 is on a level ground A and the mower 5 is on a slope B with a downward slope, the mower 5 can follow the slope B. That is, at this time, the top link 18 and the upper connecting link 21 are bent so that the mounting pin 23 is positioned downward, so the mower 5 takes a forward leaning posture relative to the tractor 1 and moves onto the slope B. It is possible to drive along it.

Furthermore, if the mower 5 runs on a slope that slopes upward, the lower link 19 and the lower connecting link 27 can be bent upward so that the mounting pin 28 is positioned upward, so the mower 5 is tilted backwards. can also be taken arbitrarily.

When the running ground of the mower 5 is inclined to the left or right with respect to the running ground of the tractor 1, the left and right lower links 19 and the lower connecting link 27 are bent in the same direction or in the opposite direction, so that the mower 5 can run regardless of the tractor 1, following the slope of the running ground.

Therefore, even when the ground slopes in either the front-rear or left-right direction, the mower 5 can be moved to the ground by the single or combined pivoting motion of the upper connecting link 24 and the pair of left and right lower connecting links 27. It can be freely tracked along the line, and tracking performance is significantly improved.

If one of the pair of left and right front gauge wheels 11 rides on a raised part, etc., the left and right front gauge wheels 1
Since there is a height difference of 1, the mower 5 tilts left and right as in the case of the above-mentioned slope. In this case, since the front gauge wheel 11 and the lower connecting link 27 are very close to each other, the vertical movement of the front gauge wheel 11 becomes the vertical movement of the horizontal axis 30 of the lower connecting link 27. The lower connecting link 27 can be pivoted smoothly and reliably. In other words, the lower connecting link 27 is located near the part where the upper and lower sides of the mower 5 are most likely to appear, and its movement directly affects the lower connecting link 2.
7, the followability of the mower 5 is even better. Therefore, even when working at high speed, the mower 5 can smoothly follow slight undulations and inclinations of the ground.

When lifting the mower 5, the hydraulic device 3 is operated in the upward direction, and the pair of left and right lower links 19 are lifted by the lift rod 20. Then, since the pivoting range of the lower connecting link 27 is restricted by the elongated hole 32, after the lower connecting link 27 pivots to the range of the elongated hole 32, the mower 5 begins to rise while being in a backward downward state. Although the connecting links 24 and 27 are used, the hydraulic device 3 can be used to move the vehicle up and down.

The lower connecting link 27 may have a boss portion 29 removably fitted onto a horizontal shaft 30 fixed to the support bracket 14 as shown in FIG. It is fixed to the lower end of 16,
This horizontal shaft 30 may be removably fixed to the support bracket 14 by a threaded portion 34 and a nut 35, and the lower connecting link 27 may be supported by this horizontal shaft 30.

In each of the above embodiments, the lower connecting link 27
is pivotable within a predetermined range with respect to the support bracket 14, but the lower connecting link 27 may be provided on the lower link 19 side as shown in FIGS. 8 and 9. That is, a mounting pin 36 is fixed to the lower connecting link 27 in the middle, and a long hole 37 is provided at the front end and a ball joint 38 is provided at the rear end. A pin 39 is removably inserted into the elongated hole 37 of the lower link 27 and the lower link 19, and the ball joint 38 is removably connected to a mounting pin 39 fixed to the support bracket 14. Of course, the mounting pin 36 is connected to the ball joint 26 of the lower link 19.
is inserted into. In this way, when the lower connecting link 27 is not required, it can be used even if it is removed.

The restriction means 33 is a lift arm 2 of the hydraulic system 3.
1 through the lift rod 20 to the lower link 1.
Any mechanism that can limit the pivoting range of the lower connecting link 27 when the lower connecting link 27 is pulled upward may be used. Lower connecting link 2 on the side
The support bracket 14 may be provided with a stopper that contacts the upper surface side of the support bracket 7, or a stopper that contacts the lower connecting link 27 from the lower surface side on the rear side of the horizontal axis 30.

In the embodiment, gauge wheels 11, 1 are used as gauge bodies.
3 is shown, but a sled-shaped forest may be provided.

As shown in the imaginary line in Fig. 2, the moadetsuki 6 has
Front limit gauge wheel 40 on the left and right center of the front side
A pair of left and right rear limit gauge wheels 41 may be provided on both left and right sides of the rear side, respectively.
These limit gauge wheels 40, 41 are provided to prevent the cutting blade 7 from scraping a raised portion of the ground.

〔Effect of the invention〕

According to the invention, the top link 18 and the mower 5
The lower link 27 is interposed between the left and right lower links 19 and the mower 5 side, and the lower link 27 is interposed between the left and right lower links 19 and the mower 5 side so as to be pivotable in the vertical direction. It can freely follow the slope of the ground, both front and rear, and left and right. Moreover, since the pair of left and right front gauge bodies 11 are provided near the pair of left and right lower connecting links 27, and the rear gauge body 13 is provided at the center of the left and right sides, the mower 5 is Movement is directly connected to the lower link 2
7 to ensure smooth operation. Furthermore, since the pivoting range of the lower connecting link 27 is restricted by the restricting means 33, it is not possible to lift the mower 5 via the three-point link mechanism 17 even though the connecting links 24 and 27 are used. can.

[Brief explanation of drawings]

FIG. 1 is a side view showing the first embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a cutaway side view of the main parts.
Fig. 4 is a plan view of the main parts, Fig. 5 is an explanatory diagram of the function,
FIG. 6 is a cutaway plan view of the main part showing the second embodiment, FIG. 7 is a cutaway plan view of the main part showing the third embodiment, and FIG.
The figure is a side view of the main part showing the fourth embodiment, and FIG. 9 is a plan view of the same. 1... Tractor, 5... Mower, 11... Front gauge wheel, 13... Rear gauge wheel, 17... Three-point link mechanism, 18... Top link, 19... Lower link, 24... Upper connecting link, 27... Lower connecting link, 33... Regulating means.

Claims (1)

[Scope of Claims] 1. Tractor mounting in which a mower 5, whose front and rear gauge bodies 11 and 12 are in contact with the ground and travels in a follow-up manner, is towed and mounted to the rear of the tractor 1 via a three-point link mechanism 17. In the type mower device, an upper connecting link 24 is provided between the top link 18 of the three-point link mechanism 17 and the mower 5 side, and a pair of left and right lower links 19 are provided.
A lower connecting link 27 is interposed between the lower connecting link 27 and the mower 5 side so as to be pivotable in the vertical direction.
A limiting means 33 is provided to limit the pivot range of the left and right lower connecting links 27, and a pair of left and right front gauge bodies 11 are provided near the left and right pair of lower connecting links 27, and a rear gauge body 13 is A tractor-mounted mower device characterized by being provided in the center. 2 Upper connecting link 24 and lower connecting link 27
A tractor-mounted mower device according to claim 1, characterized in that the mower device is attached to the mower 5 side. 3. Claims 1 or 2, characterized in that the upper connecting link 24, the lower connecting link 27, and the front gauge body 11 are arranged so as to be substantially linear in the left-right direction when viewed from above. The tractor-mounted mower device described. 4. The regulating means 33 is characterized by having an engagement pin 31 provided on the lower connecting link 27 and a long hole 32 formed in the support bracket 14 on the mower 5 side and into which the engagement pin 31 engages. A tractor-mounted mower device according to claim 1 or 2.