JPH0139127Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention provides a floating mechanism that can follow unevenness on the ground when a mid-mount mower device is attached to a tractor. This is a simple configuration of a hydraulic mechanism equipped with.

(b) Prior Art The technology related to a mid-mount mower attachment mechanism for a tractor has been known for some time. For example, there is a technique described in Japanese Utility Model Publication No. 53-15717.

Furthermore, a technique for providing a floating position in a hydraulic control valve to bring a tractor-mounted working machine into a floating state is also known, as disclosed in Japanese Patent Application Laid-Open No. 103804/1983.

(c) Problems to be solved by the invention The invention simplifies the hydraulic mechanism of a mid-mount mower device attached to a tractor, and also incorporates a floating mechanism so that the mid-mount mower can easily follow the unevenness of the ground. This is installed on the hydraulic control valve.

In addition, in order to prevent the mower device from gradually descending due to leakage of pressure oil when the mid-mounted mower is stored, a pressure oil stop valve is provided, and the pressure oil stop valve and the work equipment control lever are located near the seat. It is something.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

Hydraulic pump 3 attached to the tractor's PTO shaft
A flow divider 53 for branching pressure oil to the mower drive hydraulic motors 9L and 9R is arranged downstream of the hydraulic pump 3, and the flow divider 5
3, the left and right hydraulic control valves 51L,
A flow divider 52 branching to 51R is arranged, and the hydraulic control valves 51L, 51R are provided with three positions: floating F, neutral N, and raising U, and the hydraulic control valves 51L, 51R and the hydraulic cylinder 12
Pressure oil stop valve 17L between L and 12R,
17R, and work implement control levers 16L, 16R for operating the hydraulic control valves 51L, 51R, and operation parts for the pressure oil stop valves 17L, 17R are arranged near the cockpit.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Figure 1 is a rear perspective view showing lawn mowing work with a triple mower device installed as a working machine, Figure 2 is a side view of the triple mower device installed, and Figure 3 is a right mower B and a left side mower. FIG. 3 is a front view showing a state in which the mower A is stored in a non-working state and a state in which the mower A is in a reaping state.

An operator 1 sits on a tractor seat, and a hydraulic pump for hydraulically driving a triple mower device and a hydraulic oil tank 2 for a hydraulic motor are mounted behind the seat.

As hydraulic oil, three hydraulic motors 9L, 9
Pressure oil for R and 14, and hydraulic cylinders 12L and 12R for moving the left and right mower devices A and B up and down.
Since a large amount of hydraulic oil is required, the tractor's transmission case lubricating oil cannot be used, and a separate hydraulic oil tank 2 is provided.

The hydraulic oil in the hydraulic oil tank 2 is supplied to a hydraulic pump 3 installed on the PTO shaft of the tractor as shown in FIG.
There, it is converted into pressurized oil and sent via high-pressure pipes to the hydraulic motors 14, 9L, and 9R for driving the three mowers C, A, and B.

In addition, hydraulic cylinders 12L for left and right vertical movement,
Although it is also sent to 12R, the high-pressure pipe and flexible pipe are omitted in the drawing because they would complicate the drawing. Only the rear mower C is attached to the three-point link type work equipment mounting device installed on the tractor, and the hydraulic lift arm 2 is also installed on the tractor.
It is moved up and down using 0L and 20R.

The lift arm 20 is operated by a hydraulic lever 19. The lift arm 20 is a lift link 21
The flow moves up and down the lower link 4 via the rod 5 fixed to the lower link 4, and further projects forward from the rear mower C by the pivot pin 8 of the pivot body 6 fixed to the rod 5. The rear mower C is supported by the holding rod 7 so that it can freely float left, right, up and down.

That is, the ball joint 7a of the floating rod 7 portion into which the pivot pin 8 is inserted is interposed. By configuring it so that it can float in this way, when the rear mower C is lifted by the lift arm 20, it will tilt, so the tip of the floating rod 7 made of a square timber is placed on the front surface of the pivot body 6 to avoid the weight of the rear mower C. An engagement groove 6a is provided that fits into the case when it is lifted up, so that rotation to the left and right is prevented when it is lifted up.

The left mower A and the right mower B support a modified parallel link device that protrudes from a member such as a transmission case or a front axle bracket of an agricultural tractor, and two upper and lower links 12 and 18 forming the parallel link. By using the hydraulic cylinder 12 as the upper link, when the hydraulic cylinder expands and contracts, the deformed parallel link device itself rotates up and down, thereby moving the mower devices A and B up and down.

Then, with the left and right mower devices A and B rotated upward and stored as shown in Figure 3, guide rollers 15 and 27 are provided to protrude from the support rod 22 in order to prevent the mower devices from shaking as the tractor advances. are doing.

Fig. 5 is a perspective view of the right mower device B, Fig. 6 is a perspective view of the protector 10 of the hydraulic motor 9, and Fig. 7 is a front view of the mower device in a floating state and in contact with the lawn surface. , FIG. 8 is a front view of the state in which it has started to rotate upward for the storage state.

The mower device of this embodiment is a reel mower device, and since a long reel with blades rotates to cut the lawn, the shafts placed on the left and right with respect to the direction of movement rotate, and the left and right mower devices A and B Hydraulic motors 9L, 9R are attached to the outer surface of the hydraulic motors 9L, 9R, and pressure oil is sent to the hydraulic motors 9L, 9R to rotate them and serve as a driving source.

By providing the hydraulic motors 9L and 9R on the outside, the left and right mower devices A and B can be housed in the vertical direction as shown in Fig. 3, and when the tractor is running for transportation or movement, the mower devices can be used as in the conventional mower device. Because the hydraulic motor is not installed inside the cylinder, the hydraulic motor is located below and cannot be damaged by touching obstacles or protrusions.

However, during work, since the outermost end is likely to touch an obstacle and cause an accident, protectors 10L and 10R are provided to fit over the hydraulic motor.

The modified parallel link device has a base link composed of a pivot pin stand 24, and a hydraulic cylinder 12 serving as an upper link is pivotally connected to this pivot pin stand 24 by a pin 25.
The lower link 18 is pivotally connected by a pin 26. The lower link is an L-shaped link and is integral with the link 39 at the tip. For this reason, when the hydraulic cylinder 12, which is the upper link, extends, the lower link 18 lowers, and when it contracts, the lower link 18 moves up and down.

A lower limit stopper 1 is installed at the base of the hydraulic cylinder 12 to prevent the mower devices A and B from abnormally lowering from the working position in a floating state.
2a is provided and engaged with the recess of the pivot pin stand 24.

The pivot pin stand 24 projects from the base plate 23, and the base plate 23 is fixed to a transmission case or a front axle bracket of an agricultural tractor with bolts.

Two guide rollers, 27 and 15, protrude from one guide roller support rod 22.
comes into contact with the top cover 28 of the mower device when the rotational position of the mower device is low, and the guide roller 15
comes into contact with the top cover 28 of the mower device when the rotational position of the mower device is high, and prevents the mower devices A and B from swinging in a lifted state.

Figure 9 is a side view of the support section of the mower devices A and B that can freely rotate horizontally, vertically, forward and backward, with the mower devices lowered, Figure 10 is also a rear view, and Figure 11 is a side view of the mowers. A drawing of the device in an elevated position,
FIG. 12 is a drawing of the longitudinal rotation control spring 32, and FIG.
The figure is an explanatory diagram of the action of the longitudinal rotation control spring 32, No. 14
The figure is a side sectional view of the front and rear rotation shaft holder 36, and the first
5 is a side sectional view of the bearing portion for the longitudinal rotation shaft 42, and FIG. 16 is a side sectional view of the longitudinal rotation shaft 42 and the vertical biasing spring 4.
17 is a side view of the vertical movement shaft 38, FIG. 18 is a view of the tip of the hydraulic cylinder 12, and FIG. 19 is a view of the tip of the lower link 18.

The tip of the hydraulic cylinder 12 is fixed to a pivot tube 40, and the pivot tube 40 is pivotally supported on the upper part of a link 39 that is integrated into an L-shape at the tip of the lower link 18. Further, a pivot tube 39b is provided at the bending point between the lower link 18 and the link 39, and the vertical movement shaft 38 is pivotally supported by this pivot tube 39b.

The left and right mower devices A and B are connected to this vertical movement shaft 38.
Free rotation is allowed left, right, up and down around the center.
Further, the vertically moving shaft 38 is fixed to a bearing cylinder 37, and this bearing cylinder 37 constitutes a bearing case that can slide vertically and rotate back and forth.

Further, a regulating rod 31 for left and right rotation and vertical sliding of this bearing cylinder body 37 protrudes, and is provided in engagement grooves 34a, 33a on mounting plates 34, 33 protruding from the top cover 28 of the mower device. The regulating rod 31 is engaged.

A slide bearing 43 is provided within the bearing cylinder 37, and a longitudinal rotation shaft 42 is supported by the slide bearing 43 so as to be able to slide up and down and move up and down left and right. This longitudinal rotation shaft 42 is supported by the longitudinal rotation holder 36, and the bearing cylinder 37 can be moved up and down against the vertical biasing spring 41, and can be rotated back and forth against the longitudinal rotation control springs 32L and 32R. It is said that The longitudinal rotation shaft holder 36 is fixed to a fixed body 35, and the fixed body 35 is fixed by passing two bolts between the mounting plates 34 and 33 on the top cover 28.

In this way, the pivot tube 39 is rotated around the vertical movement shaft 38.
By rotating b, the mower device can rotate left and right and up and down, and by rotating the front and rear rotation shaft 42 within the bearing cylinder 37, it can rotate back and forth and left and right, and the mower device can rotate back and forth within the bearing cylinder 37. By moving the moving shaft 42 up and down, the mower device can be moved up and down.

As shown in FIG. 13, the longitudinal rotation control spring 32
L, 32R are engaged with the regulating rods 31, 31, and the other ends of the springs 32L, 32R are engaged with the spring receivers 50.
However, the locking points P of the springs 32L and 32R are arranged so that they are horizontal with the regulating rod 31 at the uppermost left-right rotation stop groove position of the locking groove. When the mower device rotates downward, the longitudinal rotation control springs 32L and 32R increase the tension and control the mower device to return to its original horizontal position.

Of course, even when one of the mower devices is tilted forward and the other backward, one of the longitudinal rotation control springs 32L, 32R increases the tension and controls the left and right sides to be in the same position.

As shown in FIG. 14, FIG. 16, and FIG. 17, if the height of the holder portion of the front and rear rotation shaft holder 36 is a, the free length of the biasing spring 41 is b, and the height of the bearing cylinder body 37 is c, (b+c) -a=about 30mm.

FIG. 20 is a circuit diagram of the hydraulic system of the present invention.

Hydraulic cylinder 12L,
We supply pressure oil for 12R and hydraulic motors 9L and 9R.

The pressure oil from this pump is transferred to the flow divider 5.
3, 52, hydraulic cylinders 12L, 12R
It leads to the hydraulic control valves 51L and 51R for use.

The hydraulic control valve 51 has three positions: floating F, neutral N, and raised U. In addition to this, a drop D may be provided. By setting it to the floating F position, the hydraulic cylinder 12 can freely expand and contract, but since it involves movement of pressure oil, it cannot respond to minute vibrations, so a vertical sliding part is separately provided on the work machine side. .

17L and 17R are pressure oil stop valves,
Pressure oil leaks when lifting the work equipment and moving it.
This is provided to prevent the work equipment from lowering.

As shown in FIG. 2, hydraulic control valves 51L, 51R and hydraulic oil stop valves 17L, 17R and left and right work machine control levers 16L, 16R are provided on the left and right sides of the dart box in front of the seat.

FIGS. 21 and 22 are drawings showing other embodiments of the work machine control lever.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, by providing floating positions for the hydraulic control valves 51L and 51R, the front and rear rotation shafts 42
In this floating position, the hydraulic cylinder 12 can freely expand and contract to follow irregularities such as large undulations on the ground that cannot be absorbed in the floating position.

Second, since the hydraulic motors 9L and 9R can also be driven by the pressure oil discharged from the hydraulic pump 3, it is no longer necessary to attach a large number of hydraulic pumps to the PTO shaft.

Thirdly, by branching into the left and right hydraulic control valves 51L and 51R by the flow divider 52,
It is now possible to raise and lower the left and right mower devices separately, and by providing separate pressure oil stop valves 17L and 17R, it is possible to reap near the edge of the field using only the other mower device when one mower device is stored. It has become possible to do this.

Fourth, by locating the work equipment control levers 16L and 16R and the pressure oil stop valves 17L and 17R near the seat, we were able to improve operability even though this is a mid-mount mower that was attached to the tractor later. It is something.

[Brief explanation of drawings]

Figure 1 is a rear perspective view of an agricultural tractor equipped with a triple mower device, Figure 2 is a side view of the agricultural tractor equipped with a triple mower device, and Figure 3 is a non-working state of the right mower B and left mower A. 4 is a perspective view of the support part of the rear reel mower device, FIG. 5 is a perspective view of the right mower device B, and FIG. Fig. 7 is a front view of the mower device when it is lowered into a floating state and is in contact with the lawn surface, and Fig. 8 is a front view of the protector 10 when it has started to rotate upward for storage. Figure 9 is a side view of the support part that allows mower devices A and B to freely rotate left and right, up and down, and back and forth.
The figure is a rear view, FIG. 11 is a side view of the mower device in the raised state, FIG. 12 is a diagram of the longitudinal rotation control spring 32, and FIG. 13 is an explanation of the function of the longitudinal rotation control spring 32. 14 is a side sectional view of the longitudinal rotation shaft holder 36, FIG. 15 is a side sectional view of the bearing portion for the longitudinal rotation shaft 42, and FIG. 16 is a side sectional view of the longitudinal rotation shaft 42 and the vertical biasing spring 41. Drawings showing the intervening state, FIG. 17 is a side view of the vertical movement shaft 38, FIG. 18 is a drawing of the tip of the hydraulic cylinder 12, and FIG.
FIG. 9 is a drawing of the tip of the lower link 18, and FIG. 20 is a hydraulic circuit diagram of the present invention. Figures 21 and 22
The figure is a diagram showing another embodiment of the work machine control lever. A...Left mower device, B...Right mower device, 1
2...Hydraulic cylinder, 18...Lower link, 16
L, 16R...Work equipment control lever, 17L, 17R
...Pressure oil stop valve, 51L, 51R...Hydraulic control valve.

Claims (1)

[Scope of utility model registration request] Hydraulic pump 3 attached to the tractor's PTO shaft
A flow divider 53 for branching pressure oil to the mower drive hydraulic motors 9L and 9R is arranged downstream of the hydraulic pump 3, and the flow divider 5
3, the left and right hydraulic control valves 51L,
A flow divider 52 branching to 51R is arranged, and the hydraulic control valves 51L, 51R are provided with three positions: floating F, neutral N, and raising U, and the hydraulic control valves 51L, 51R and the hydraulic cylinder 12
Pressure oil stop valve 17L between L and 12R,
17R, and work equipment control levers 16L and 16R for operating the hydraulic control valves 51L and 51R, and operation parts for the pressure oil stop valves 17L and 17R are arranged near the seat.