JPS631652Y2 - - Google Patents

Description

[Detailed description of the invention] In conventional tractor steering devices, a stopper that limits the turning range of the front wheels is provided on the front axle. Since an extremely large impact load is applied to the knuckle arm and the knuckle case, the strength of these members must be made excessive, which has the disadvantage of significantly increasing costs.

The present invention aims to provide a steering device for a tractor that can reliably limit the turning range of the front wheels, has a simple structure, and can be obtained at low cost. is fixed, a stopper for limiting the turning range of the front wheel is fixed to the actuating arm, and the stopper is made to correspond to a set bolt of the split transmission case at the limit of the turning range. That is.

The embodiment shown in the drawings will be explained below.1
is a machine body having a split-type mission case 2 at the front, and a working machine, such as a seedling planting device, is connected to the rear by a top link 3 and a lower link 4, and both rear sides of the mission case 2 are connected to each other by a top link 3 and a lower link 4. Rear wheels 6, 6 are pivotally supported at the rear portions of the swing chain cases 5, 5 extending rearward from the swing chain cases 5, 5, and front wheels 7, 7 are pivotally supported at the front portions of the swing chain cases 5, 5, respectively.

8 is a steering shaft supported by a steering column 9, with a steering wheel 10 at the top and a pinion 11 at the bottom.
The sector gear 13 attached to the upper part of the sector shaft 12 provided at the rear meshes with the pinion 11, and both ends of the operating arm 14 fixed to the lower part are connected to the left and right knuckle cases 15, 15.
It is connected by drag links 17, 17 to knuckle arms 16, 16 protruding from the shaft.

The mission case 2 is divided into left and right parts, and the lower middle portion is tightened and fixed with a set bolt 18 that passes through the case, and the outer periphery of the overlapping part is connected with a large number of dowel bolts 19. Front wheel drive shaft 20 supported on the front part of 2
A rear wheel drive shaft 21 supported at the rear is provided with differential mechanisms 22 and 23, respectively, and an axle drive wheel 24
is interlocked with an input shaft 25 driven by the engine E via a number of transmission gears, and a sprocket 22a of the front differential mechanism 22 is driven by a sprocket 26 of the front wheel drive shaft 24 via a chain 27.

Stoppers 28, 28 are welded to both sides of the operating arm 14, respectively, and these stoppers 28, 28 are used when the operating arm 14 is turned by the steering shaft 8 to the limit of the turning range of the front wheels 7, 7. It is provided at a position where it comes into contact with the set bolt 18.

In addition, the sector shaft 12 is shown in FIGS. 5 and 6.
As shown in the figure, the front differential mechanism 22 and the rear wheel drive shaft 2
If the transmission case 2 is vertically penetrated and supported between the transmission case 1 and the transmission case 1, the space of the transmission case 2 can be used rationally to firmly support the sector shaft which is subjected to a large load. 29 is the PTO axis.

In the above-mentioned device, the steering shaft 8
When rotated by the steering wheel 10, the pinion 11 rotates the sector gear 13 to the left or right, and the sector shaft 12 rotates the operating arm 14 to the left or right. When the turning limit is reached, the stopper 28 comes into contact with the set bolt 18 and no further turning operation occurs.

As described above, the present invention fixes an actuating arm to a sector shaft that interlocks with the steering shaft, fixes a stopper to the actuating arm to limit the turning range of the front wheels, and attaches the stopper to a set bolt of a split-type transmission case. Since the stopper is adapted to make contact at the limit of the turning range, the set bolt of the split transmission case can be used as the member that the stopper comes into contact with, eliminating the need to provide a special receiving member and reducing costs. You can force it.

Moreover, when the turning range of the front wheels is restricted by the stopper, an impactful load is generated, but the transmission case is strongly formed to support a large number of transmission members, and can sufficiently withstand this load, so special reinforcement is required. It is not necessary to provide the drag link, the knuckle arm and the knuckle case to be strong as in the case of a conventional front axle part provided with a stopper, and it can be obtained at low cost.

Furthermore, the stopper and set bolt do not interfere with steering operation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a side view of the riding rice transplanter with the seedling planting device omitted, Figure 2 is a perspective view of the main parts, Figure 3 is a partially cutaway plan view of the same, Figure 4 is a developed view of the traveling transmission, FIG. 5 is a side view of another example of the support portion of the sector shaft, and FIG. 6 is a sectional view of the main part of the same. 2...Mission case, 6...Rear wheel, 7...
Front wheel, 12...Sector shaft, 14...Operating arm, 16...Knuckle arm, 17...Drag link, 18...Set bolt, 28...Stopper.

Claims (1)

[Scope of utility model registration request] An operating arm is fixed to a sector shaft that interlocks with the steering shaft, a stopper that limits the turning range of the front wheels is fixed to the operating arm, and the stopper is attached to a set bolt of a split transmission case at the limit of the turning range. A steering device for a mobile agricultural machine, characterized in that the steering device is adapted to be in contact with each other.