JPS6124006Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating device for a mid-mounted work machine that is disposed in the lower abdomen of a tractor so as to be able to rise and fall freely.

Power is transmitted from the front or rear PTO shaft to work machines such as mid-mount mowers, which are attached to the underbelly of the tractor body, through a power transmission means. Alternatively, it is mounted so that it can be raised and lowered for evacuation when not in use.

As disclosed in Japanese Utility Model Application Publication No. 54-145630, the conventional lifting device for mid-mount work equipment is
A connecting body is provided between the lift arm of the hydraulic system and the working machine so that the working machine can be raised by lifting the lift arm, and this connecting body is directly connected to the tip of the lift arm.

The tip of the lift arm is a position where a lift rod for raising and lowering the lower link is connected when the rear working machine is connected by a three-point link mechanism,
Therefore, it is difficult to install a rear working machine that can be raised and lowered at the same time, and even if the lift rods could be connected, the lift rod and lower link would interfere with the connecting body, making it difficult to raise and lower the two working machines. become.

In view of the problems of the conventional technology, the present invention has a connecting arm protruding from the middle part of the lift arm toward the lower front, and a connecting body for lifting and lowering the mid-mount work machine is connected to this connecting arm. To provide a lifting device which allows a rear working machine to be attached by freeing the tip of an arm and prevents interference between a connecting body and a lift rod.

The feature of this invention to achieve this purpose is that the mid-mounted work equipment is attached to the lower abdomen of the tractor body, which is equipped with a hydraulic system for raising and lowering the work equipment at the rear upper part, so that it can be raised and lowered, and the lift arm of the hydraulic system and the work equipment are attached to the lower abdomen of the tractor. In a lifting device for a mid-mounted work machine in which a connecting body is provided between the lift arm and the work machine can be raised by raising the lift arm, the connecting body is connected to the connecting body from the middle part of the lift arm in a substantially horizontal position to the lower front. This is due to the protruding arm.

Embodiments of the present invention will be described below with reference to the drawings.

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 and the like are mounted on the radiator 4 .

Reference numeral 5 denotes a crankshaft of the engine 2, which can drive the radiator fan 7 etc. via a wrap-around transmission mechanism 6, and also drives the front part via a power on/off clutch 8.
It is interlocked and connected to the PTO shaft 9. Front PTO shaft 9
is rotatably supported by the front wheel bearing stand 3 via 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 that can be freely attached to and detached from the front vehicle bearing stand 3, and a front PTO shaft 9.
A pulley 12 is installed in the upper part of the case 11 to be inserted into and removed from the drive shaft 1 supported in the lower part of the case 11.
3, a pulley 14 fixed to the drive shaft 13 within the case 11, and a belt 15 stretched between the pulleys 12 and 14.

Reference numeral 16 denotes a mid-mount mower, which includes a mower body 18 suspended from the lower abdomen of the tractor body 1 via a suspension mechanism 17 so as to be able to rise and fall freely, and a mower body 18 supported by the mower body 18 via a rotating shaft 19. Cutting blade body 2
0 and a gear box 22 having an input shaft 21 interlocked with the rotating shaft 19, and the mower main body 18 can follow the ground via a gauge member 23.

The suspension mechanism 17 has two pairs of links 17b and 17c connected to each other by a support shaft 17a, and each link 17b and 17c is connected by a pin to a bracket 17d fixed to the tractor body 1 and the mower body 18, respectively. , both links 17b and 17c perform bending and stretching operations when the mower main body 18 moves up and down.

The input shaft 21 is connected to the drive shaft 1 via a universal joint shaft 27.
3, and the flexible joint shaft 27 has a middle part that is expandable and contractible, and both ends of which are bendable.

Reference numeral 25 denotes a well-known hydraulic system that is permanently installed on agricultural tractors, and has a pair of lift arms 26 on the left and right, and a lower link of a three-point linkage mechanism to which various rear working machines are attached to the tip of the lift arms 26. A lift rod is connected between the two to raise and lower the rear working machine. 28 is a sheet.

1 to 3, the lifting device 31 of the present invention consists of a lifting mechanism 32, a hydraulic device 25, etc., and the lifting mechanisms 32 are provided in pairs on the left and right sides of the tractor body 1. Part 3
5, a rod 36, a connecting arm 37, etc.

The swinging body 34 is a bell crank that is swingably provided via a pin 39 implanted in the side of the tractor body 1, and a tension member 35 is connected to one end of the bell crank 34. This tension member 35 is formed of a flexible member, for example a wire, and its lower end is connected to a mounting plate 40 on the mower body 18. Note that the lower end of the tension member 35 may be connected to the support shaft 17a of the suspension mechanism 17, and it is preferable to form the tension member 35 so that its length can be adjusted freely.

The connecting arm 37 is fixed to the middle part of the lift arm 26 via a bolt, and has an arcuate shape curved forward. Therefore, as shown in FIG. It protrudes forward and downward from the middle part, and its tip 37a (connection part) is located below the hydraulic device 25, and moves approximately back and forth with respect to the tractor body 1 by rotation of the lift arm 26. It is formed to do so.

The rod 36 connects the tip 37a of the connecting arm 37 and the rocking body 34, and serves as a connecting body that transmits the back and forth movement of the tip 37a to the rocking body 34.

To raise the mower body 18, the hydraulic device 25
to rotate the lift arm 26 upward,
The tip 37a, the rod 36, and the swinging body 34 are moved backward to the imaginary line position in FIG. Oscillator 34
Due to the swinging of the mower body 1 through the tension member 35,
8 goes up and down.

In order to lower the mower body 18, the hydraulic system 2
By lowering the oil pressure of 5, the mower body 1
8 descends under its own weight.

The mower body 1 touches a raised area or stone during reaping work.
8 rides on it, the tension member 35 is flexible and therefore bends, and the suspension mechanism 17 only bends.

FIG. 4 shows a modification of the connecting arm. The base of the connecting arm 41 is formed into a hook shape, and is fitted onto the lift arm 26 from above and fixed with a bolt 42. makes it easy to install. Also, the bolt 4 of the lift arm 26
If the hole 43 passing through the lift arm 26 is made into a long hole along the longitudinal direction of the lift arm 26, the height of the work implement 16 can be maintained even if there is a manufacturing error in the length of the rod 36 or even if the tension member 35 is stretched. can be adjusted.

According to the present invention described in detail above, a connecting arm is provided protruding forward and downward from the middle part of the lift arm in a substantially horizontal position, and a connecting body for raising and lowering the mid-mount work machine is connected to this connecting arm. Because there are
The lift arm can raise and lower mid-mounted work equipment, and its tip is free, allowing the lift rod to be connected to it, ensuring that it can be used to raise and lower a three-point linkage mechanism equipped with a rear work equipment, which is an essential requirement for hydraulic equipment. In addition, even when the lift rod is connected and the lift arm is raised, the connection arm protrudes forward and downward, so there is no interference between the lift rod, the tip of the connection arm, and the connection body, and the lift rod is connected to the lift arm. Connection can be guaranteed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially sectional side view of the whole, Fig. 2 is a side view of the main part,
FIG. 3 is a rear view, and FIG. 4 is a partially sectional rear view showing a modification of the connecting arm. 1... Tractor body, 10... Power take-off device,
16... Mid-mount mower, 17... Lifting mechanism, 17b, 17c... Link, 18... Mower body, 25... Hydraulic device, 26... Lift arm, 31... Lifting device, 32... Lifting/lowering mechanism, 34
... Rocking body, 35 ... Tension member, 36 ... Rod, 37 ... Connection arm, 37a ... Tip.

Claims (1)

[Scope of utility model registration request] A mid-mounted work equipment is attached to the lower abdomen of the tractor body, which is equipped with a hydraulic system for raising and lowering the work equipment at the rear upper part, so that it can be raised and lowered freely, and a connecting body is provided between the lift arm of the hydraulic system and the work equipment to raise the lift arm. A lifting device for a mid-mount work machine that enables the work machine to be lifted by a vertical position, characterized in that a connecting arm that is connected to a connecting body is provided protruding forward and downward from the middle part of the lift arm when in a substantially horizontal position. Lifting device.