JPH024Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a small agricultural tractor, which has a mower device attached to the abdomen, rear, etc., and is a hydraulic system for lifting and lowering the work equipment of a mower tractor for mowing lawns, etc. It is related to.

(b) Conventional technology These agricultural tractors have low horsepower, and it is difficult to carry out reaping work with the work equipment attached to both the abdomen and the rear at the same time. There is no need to replace the abdomen and rear parts, and the equipment is often used in its original state throughout its lifespan.

However, since either one is equipped with a rotary mower or not, it is necessary for agricultural tractors to consider both mid-mount and rear-mount models, and to be able to raise and lower them using hydraulic equipment in either case.

(c) Problems that the invention aims to solve This invention has only one hydraulic cylinder, and both the mower lift arm and rear lift arm can be rotated by arms and links, and by removing the pin between the arm and the link. This makes it possible to stop unnecessary rotation of the lift arm.

In addition, when attached to both the abdomen and the rear, only the necessary mower is used, and unnecessary mowers are not driven or moved up and down, making it possible to use them in a variety of ways. It becomes a hydraulic system for agricultural tractors.

(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.

In an agricultural tractor, the mower lift arm 22 is pivoted to a front pivot shaft 38 supported on the abdomen of the body frame 10, and the rear lift arm 18 is pivoted to a rear pivot shaft 25 supported at the rear. Axis 3
A hydraulic cylinder 6 is disposed between the hydraulic cylinder 8 and the rear rotation shaft 25, and is linked with the arms 21 and 39 so that the front rotation shaft 38 and the rear rotation shaft 25 can be rotated by expansion and contraction of the hydraulic cylinder 6. The mower lift arm 22 is inserted and removed by inserting and removing pins 40 and 44 that lock between the hydraulic cylinder 6, the arm, and the link.
Only the rear lift arm 18 can rotate both lift arms 22 and 18.

(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 an overall side view of the hydraulic system of an agricultural tractor, Figure 2 is a plan view showing the relationship between the machine frame and the hydraulic system, Figure 3 is an enlarged side view of the vicinity of the dart board and fender, and Figure 4 is the same. A plan view, Fig. 5 is a rear view of the lift arm and the vicinity of the hydraulic cylinder, Fig. 6 is a side view of the hydraulic oil tank and lift lever section, Fig. 7 is also a rear sectional view, and Fig. 8 is the hydraulic pressure of this hydraulic system. It is a circuit diagram.

In FIGS. 1, 2, 3, 4, and 5, the agricultural tractor has a body frame 10, which is configured in a frame shape, as a body support member from the front end to the rear end of the body.

The fuselage frame 10 is the left and right fuselage frames 10.
The main components are L and 10R. The engine E is suspended and supported on the front part of the fuselage frame 10 via anti-vibration rubber.

Front PTO pulley 3 to the front of engine E
6 is protrudingly driven. A clutch housing 14 is fixed to the rear surface of the engine E, and the clutch housing 14 and the engine E are suspended and supported by vibration isolating rubber.

At the rear of the fuselage frame 10, a transmission case 11 is attached to the left and right frames 10L of the fuselage frame 10,
10R, and a fender 12 is erected on the fuselage frame 10.

The left and right sides of the fender 12 protrude forward and downward,
It is connected to step 13. A bonnet 1 is covered over the front engine E, and the bonnet 1
The rear part is closed with a dash board 2. A hydraulic pump 3 driven by the engine E is fixed to the side surface of the engine E, and a hydraulic oil tank 4 of a hydraulic system is arranged inside the bonnet 1 at the front of the dash board 2.

Since the clutch housing 14 is supported by anti-vibration rubber and moves up and down due to vibration, other parts cannot be fixed to it, so a U-shaped support stand 17 is erected from the fuselage frame 10, and an inverted U-shaped support stand 17 is installed on top of it. A hydraulic oil tank base 19 in the shape of a letter is provided, and the hydraulic oil tank 4 is mounted on this base.
is permanently installed. A hydraulic valve device V is attached to the side cover 5 of the hydraulic oil tank 4.

A suction pipe 9 made of a large diameter flexible pipe is connected from the hydraulic oil tank 4 to the hydraulic pump 3, and a high pressure pipe 7 is connected from the hydraulic pump 3 to a hydraulic valve device V attached to the lid 5 of the hydraulic oil tank 4. ing.

Lift lever 15 that operates the hydraulic valve device V
is protruding from the right side of the darts board. Pressure oil controlled by a hydraulic valve device V is connected via a high-pressure pipe 8 to a transmission case 11 and a hydraulic cylinder 6 on the upper side. 16 is a stopper for the high pressure pipe 8.

As shown in FIG. 5, a rotation shaft 25 is pivotally supported on the rear end of the body frame 10, and left and right rear lift arms 18L, 18R are fixedly attached to the rotation shaft 25. Similarly, a rotating arm 24 is loosely fitted onto the rotating shaft 25. The rotating arm 24 is pivotally connected to the arm 21 via the link 20.
is rotated by the extension of the hydraulic cylinder 6.

The arm 21 is fixed to a front rotation shaft 38, and moves mower lift arms 22L, 22R fixed to the front rotation shaft 38 up and down.

The hydraulic cylinder 6 and the hydraulic device are optional, and if these are not installed, the arm 21 is rotated using a manual lift lever.

In this embodiment, a manual lift lever is not shown.

The mower lift arms 22L and 22R are fixed to the front rotation shaft 38, and one more arm 39 is attached to the front rotation shaft 38.
is provided protruding from the front rotation shaft 38. The arm 39 and the arm 21 are simultaneously pivotally connected to the hydraulic cylinder 6 by a pin 40.

Therefore, by removing this pin 40 from the arm 39 portion and pivotally connecting it only to the arm 21, the rotation of the mower lift arm 22 can be stopped.

Also, conversely, the pin 4 at the front or rear of the link 20
By removing 2 and 41, it is also possible to stop the rotation of the rear lift arm 18 for other working machines at the rear.

Also, the rotation arm 24 and the rear lift arm 18L
It is also possible to remove the pin 44.

In FIG. 5, the support 26 is connected to the rear rotation shaft 25
The top link hitch 23 also protrudes from the support 26.

The support base 26 is fixed on the body frame 10.

In FIGS. 5 and 7, a lid 5 is fixed to the right side of the hydraulic oil tank 4. As shown in FIG. 4a is a cap of the hydraulic oil tank 4.

A hydraulic valve device V is fixed on the inner surface of the hydraulic oil tank 4 of the lid 5, and a filter 34 is fixed below it. A suction pipe 9 made of a large-diameter flexible pipe is connected to a pipe 9a projecting from the suction pipe 9, and supplies hydraulic oil to the hydraulic pump 3. Then, the pressure oil made high-pressure by the hydraulic pump 3 is sent to the pressure oil port 7a of the lid body 5 through the high-pressure pipe 7. It is then controlled within the hydraulic valve device V and sent to the hydraulic cylinder 6 through the high pressure pipe 8.

The arm 27 moves the rotary spool of the hydraulic valve device V, and the arm 27 is connected to the operating arm 2 which is integrated with the lift lever 15 via a link 28.
It is connected to 9.

A neutral position holding mechanism includes a raising arm 32 and a lowering arm 31 so that the hydraulic valve device V returns to the neutral position immediately when the lift lever 15 is released.

As shown in FIG. 7, the actuating arm 29 has a crank bending portion 29a in the middle, and when the lift lever 15 is rotated, the actuating arm rotates. It rotates downward along with the raising arm 32, and when rotating in the lowering direction, it rotates upward along with the lowering arm 31. The raising arm 32 and the lowering arm 31 are prevented from rotating further inward by a central fixing pin 33, and a return spring 30 installed between both arms 32, 31 prevents one arm from rotating outward. It works to return the rotation to the fixed pin 33 side.

Therefore, when the lift lever 15 is released after being operated in the upward direction, the operating arm 29 is returned by the raising arm 32 and the return spring 30.
The raising arm 32 is locked by the fixing pin 33, and the operating arm 29 rotates until it comes to the neutral position.

Similarly, when the lift lever 15 is released after being operated in the downward direction, the actuating arm 29
is returned to the neutral position by the lowering arm 31 and return spring 30. Reference numeral 35 denotes a rotation stopper pin for the lift lever in the lowering direction, and the upper surface of the support base 17 also serves as a stopper for rotation in the upward direction. The lift lever 15 and neutral position holding mechanism are
It is configured on a hydraulic oil tank base 19.

(f) Effects of the invention The present invention, configured as described above, has the following effects.

First, when the rotary mower device is attached only to the abdomen or only to the rear, unnecessary rotation of the other lift arm can be stopped.
When using only one mower while attached to both, the other mower can be made unrotatable, eliminating the need for wasted horsepower, allowing a single agricultural tractor to work on both the abdomen and the rear. This tractor could be used in a wide range of applications, as it could be equipped with a machine and also raise and lower two working machines with a single hydraulic cylinder.

Second, when removing the hydraulic lifting device and using a manual lever to lift and lower the work equipment, the same arm and link can be used to link the manual rotation lever, allowing only the abdomen and rear of the work equipment to be moved. You can also move it up and down.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the hydraulic system of an agricultural tractor, Figure 2 is a plan view showing the relationship between the machine frame and the hydraulic system, Figure 3 is an enlarged side view of the vicinity of the dart board and fender, and Figure 4 is the same. A plan view, Figure 5 is a rear view of the rear lift arm and the vicinity of the hydraulic cylinder, Figure 6 is a side view of the hydraulic oil tank and lift lever, Figure 7 is a rear sectional view, and Figure 8 is a rear view of the hydraulic system. It is a hydraulic circuit diagram. 6... Hydraulic cylinder, 18... Rear lift arm, 22... Mower lift arm, 40, 41,
42, 44...pin.

Claims (1)

[Scope of utility model registration request] In an agricultural tractor, the mower lift arm 22 is pivotally supported on a front rotation shaft 38 supported on the abdomen of the body frame 10, and the rear lift arm 18 is pivotally supported on a rear rotation shaft 25 supported at the rear. Axis 3
A hydraulic cylinder 6 is disposed between the hydraulic cylinder 8 and the rear rotation shaft 25, and is linked with the arms 21 and 39 so that the front rotation shaft 38 and the rear rotation shaft 25 can be rotated by expansion and contraction of the hydraulic cylinder 6. By inserting and removing the pins 40, 41, 42, and 44 that interpose the pins 20 and lock between the hydraulic cylinder 6, the arm, and the link, only the mower lift arm 22, only the rear lift arm 18,
A hydraulic system for an agricultural tractor, characterized in that both lift arms 22, 18 can be rotated.