JPS6327529Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, a lift rod that raises and lowers a three-point linkage mechanism of a tractor is configured to expand and contract by rotating a screw shaft built into the lift rod, and extends from a gear case attached to the lift rod to the vicinity of the driver's seat. A system in which the lower link is adjusted up and down by rotationally driving the screw shaft while monitoring the working condition using a screw shaft is already known from Japanese Utility Model Application No. 55-23093 and No. 56-43304. .

However, although the above-mentioned known device allows the lift rod to be extended and retracted from the driver's seat, when the work equipment is attached to the lower link that moves up and down by the lift rod, the lower link and the work equipment must be operated by getting on and off the driver's seat many times. It was extremely inconvenient because it was not possible to match the relative position with the connecting position of the

Also, a tractor is known in which a gear case having an input shaft substantially orthogonal to the lift rod is attached to the lift rod so that the extension and contraction can be controlled only from the ground, but the extension and contraction cannot be adjusted from the driver's seat.

The present invention allows the length of the lift rod to be adjusted very easily by extending and contracting both in the driver's seat and on the ground, and by using the gear case attached to the conventional lift rod, the lift rod can be obtained with a simple structure and at low cost. The purpose of the present invention is to provide a support link adjustment device for a tractor, which is equipped with a lift rod that expands and contracts by the rotation of a screw shaft, and the screw shaft is rotated through a gear case attached to the lift rod using an upper adjustment handle provided in the driving section. In the tractor, the passive gear in the gear case is attached to a helical shaft, the drive gear meshing with the passive gear is attached to an input shaft interlockingly connected to the upper adjustment handle, and the input shaft is connected to the upper adjustment handle. It is characterized in that it protrudes to the opposite side, and a lower adjustment handle is attached to this protrusion.

The embodiment shown in the drawings will be explained below.1
is a clutch housing in which an engine 2 is attached to the front and a transmission case 3 is attached to the rear, and the front wheels 4 are attached to the bottom of the engine 2.
Rear wheels 5, 5 are attached to the rear axle that protrudes left and right from the transmission case 3.

Reference numerals 6 and 6 denote a pair of left and right lower links, and lift arms 7 and 7, which are moved up and down by a hydraulic system, are connected to the lower links 6 and 6 by lift rods 8a and 8b. The top link 9 constitutes a three-point link, and a working machine is attached to the rear end of the link.

In addition, protective struts 12 and 1 are provided on both sides of the front of the steering wheel 10, the driver's seat, and various levers, and on the bearings of the left and right rear axles.
2, 13, 13 are erected, a roof 15 is attached to the frame 14 attached to the upper part of these, and the middle part of the rear columns 13, 13 is integrally connected and reinforced by a substantially horizontal plate 16. It has been done.

One of the lift rods 8a has a screw shaft 1 extending downward from a gear case 17 attached to the upper part.
8 and the lift fork 1 in which the screw shaft 18 is screwed together.
9, and the upper end of the adjustment shaft 20, which penetrates the gear case 17 and projects upward and downward, is connected to the universal joint 21.
A cylinder shaft 22 consisting of a pair of rectangular cylinders that can be slid freely through the cylinder shaft 22
The universal joint 2 is connected to the lower end of the cylindrical shaft 22, and the universal joint 2
The shaft portion of the upper adjustment handle 24 connected via the hub 25 is fixed to one side of the plate 16.
is rotatably supported by the adjustment shaft 2.
The drive gear 26 fixed at 0 is meshed with a passive gear 26a fixed to the screw shaft 18.

Further, a lower adjustment handle 27 is rotatably attached to the lower part of the adjustment shaft 20 by a pin 28, and this lower adjustment handle 27 is formed like the upper adjustment handle 24, and its shaft portion is attached to the gear case 1.
7 so that the operation part protrudes rearward, and the shaft part may be interlocked and connected to the adjustment shaft 20 via a bevel gear.

In the above-mentioned device, when the work machine is attached to the three-point link mechanism, the lower link 6 on the lift rod 8b side, which does not have an adjustment mechanism, is brought to an appropriate height by the lift arm 7 and the work machine is connected, and the other lower link 6 is attached to the lower part. When the adjustment handle 27 is turned sideways as shown by the chain line in FIG. 3 and rotated, the screw shaft 18 rotates via the driving gear 26 and the passive gear 26a.
Since the lift rod 8a expands and contracts, the height of the rear part of the lower link 6 on that side can be adjusted, and after this adjustment is made, the lower link 6 is connected to the work machine.

In addition, when adjusting the length of the lift rod 8a while checking the condition of the work equipment during work, the operator should
At step 1, the upper adjustment handle 24 is rotated to adjust the height of one side of the working machine.

Since the boss 25 of the upper adjustment handle 24 of the present invention is attached to the connecting reinforcing plate 16 of the protective column, no special support member is required and it can be easily attached to a ready-made item.

The present invention provides a tractor equipped with a lift rod that expands and contracts by the rotation of a screw shaft, and in which the screw shaft is rotated by an upper adjustment handle provided in the driving section via a gear case attached to the lift rod. is attached to a screw shaft, and a drive gear meshing with the driven gear is attached to an input shaft interlockingly connected to the upper adjustment handle, the input shaft is made to protrude to the side opposite to the upper adjustment handle, and a lower adjustment handle is attached to this protrusion. Since the lift rod is installed, the lift rod can be extended or retracted by operating the upper adjustment handle from the driver's seat while riding on the tractor while observing the condition of the work equipment. Operate the handle to adjust the length of the lift rod, thereby matching the height of the lower link to the attachment point of the work equipment, increasing efficiency without having to climb up and down the tractor and turn the upper adjustment handle as in the past. The work equipment can be easily and conveniently attached to the lower link.

In addition, the lower adjustment handle operated on the ground can be attached by simply protruding the input shaft linked to the upper adjustment handle to the opposite side of the upper adjustment handle. The drive gear that transmits the operating force of the upper adjustment handle to the helical shaft and the passive gear that meshes therewith can also be used as the operating force transmission means of the lower adjustment handle, thereby significantly simplifying the operating mechanism. Can be made smaller.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a side view of the tractor, Figure 2 is a rear view of the same as above, Figure 3 is a side view showing a partial cross section of the main parts, and Figure 4 is a side view of the tractor.
The figure is a sectional view taken along the line A-A in FIG. 3, and FIG. 5 is a rear view of the lower adjustment handle. 6... Lower link, 8a, 8b... Lift rod, 17... Gear case, 18... Screw shaft, 20...
...Adjustment shaft, 24...Upper adjustment handle, 26...
Drive gear, 26a...Passive gear, 27...Lower adjustment handle.

Claims (1)

[Scope of utility model registration request] In a tractor equipped with a lift rod that expands and contracts by rotation of a screw shaft, and the screw shaft is rotated by an upper adjustment handle provided in the driving section via a gear case attached to the lift rod, the passive gear in the gear case is rotated by the screw shaft. The drive gear meshing with the passive gear was attached to an input shaft interlockingly connected to the upper adjustment handle, the input shaft was made to protrude to the opposite side from the upper adjustment handle, and the lower adjustment handle was attached to this protrusion. A support link adjustment device for a tractor, characterized in that: