JP2000211540A - Tractor steering system - Google Patents

Abstract

(57) [Summary] [Problem] A power steering cylinder for a tractor steering wheel,
Maintains a large knuckle arm working space to facilitate maintenance. A knuckle (3), which is connected to a power steering cylinder (2) that expands and contracts based on an operation of a steering handle (1) and is steered and rotated, is provided outside the upper end of a king pin (5) of a steered wheel (4). Configuration of tractor steering system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tractor steering device. It can be used as a steering wheel that can steer a rear wheel like a tractor for a front mower.

[0002]

In a tractor steering system in which a knuckle arm of a steered wheel is interlocked by a power steering cylinder, the power steering cylinder and the knuckle arm are arranged inside the lower part of the vehicle body, so that the installation position is restricted. Easy to receive.

[0003]

According to the present invention, a knuckle 3 which is steered and rotated by being connected to a power steering cylinder 2 which expands and contracts based on an operation of a steering handle 1 is connected to an upper end of a king pin 5 of a steered wheel 4. Of the tractor steering device provided outside the vehicle.

[0004]

By operating the steering handle 1, the power steering cylinder 2 is extended and contracted, the knuckle arm 3 is rotated around the king pin 5, and the steered wheels 4 are steered. Since the knuckle arm 3 interlocked with the power steering cylinder 2 is located on the outside on the king pin 5, interference with the vehicle body side constituent member is reduced, and the degree of freedom of the installation area of the power steering cylinder 2 is increased, so that the configuration is improved. Can be simplified, and maintenance can be facilitated.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 6 has a front steerable wheel 4 and a rear steerable wheel 4 steerable by a steering handle 1.
Can be driven by an engine mounted below the rear hood 8 to travel. A steering post 9 having a steering handle 1 is located at a front end, and has a cockpit 11 behind a step floor 10 on the rear side.

A lift link 13 is provided on the front side of the vehicle body 6 to be moved up and down by a vertical rotation of a lift arm 12, and a deck frame 15 of a mower deck 14 is suspended and connected.
Front mower type. Reference numerals 16 and 17 are gauge wheels. Reference numeral 18 denotes a discharge port for discharging the cut grass. The power steering cylinder 2 is expanded and contracted by hydraulic pressure, and controls the control valves of all hydraulic circuits by operating the steering handle 1 to expand and contract the power steering cylinder 2. The power steering cylinder 2 connects the outer surface of one side of the rear axle bracket 19 of the vehicle body 6 and the knuckle arm 3 provided at the upper end of the final case 21 at one end of the rear axle housing 20.

The rear axle housing 20 is supported below the rear axle bracket 19 and has a downwardly facing final case 21 at the outer end. A steering case 22 is provided at the lower end of the final case 21 so as to be steerable and rotatable integrally with the king pin 5, and the knuckle arm 3 is provided at an upper end thereof and is rotatable integrally with the king pin 5. The left and right knuckle arms 3 are linked by a tie rod 23,
The power steering cylinder 2 is connected to the front outer end of the knuckle arm 3 on one side, and the steered wheels 4 can be steered around the kingpin 5 by the expansion and contraction of the power steering cylinder 2.

Since the knuckle arm 3 for connecting the power steering cylinder 2 is protruded outward at the upper end of the king pin 5 in this manner, the steering rotation range is outside the rear axle bracket 19 which is a part of the vehicle body 6. To maintain a wide steering space so as not to interfere.
Also, the position of the power steering cylinder 2 connected to the knuckle arm 3 can be located as close to the outside of the vehicle body 6 as possible, such as connected to the outside of the rear axle bracket 19.

3 to 5 are different from the above example in that
The connection structure of the front mower deck 14 by the lift link 13 is set.
, And can be moved up and down in the front-up-inclination posture B when crossing a ridge or climbing a slope. A lift rod 24 is provided between the lift arm 12 and the lift link 13 on the vehicle body 6 side.
Are connected by 25 is a connecting pin of the lift link 13 to the front part of the vehicle body 6, 26 is a connecting pin of the lift link 13 and the deck frame 15, and the mower deck 14 is provided at a state of the front center of gravity. Reference numeral 27 denotes an input gear case in the upper central portion of the mower deck 14, reference numeral 28 denotes this input shaft, and reference numeral 29 denotes a transmission shaft that interlocks between the PTO shaft 30 and the input shaft 28 on the vehicle body 6 side, and has a telescopic shaft, a universal joint and the like. Each blade arranged below the mower deck 14 is rotated and linked.

A lower link 31 is connected between the upper part of the mower deck 14 and the front part of the vehicle body 6 by front and rear pins 32 and 33 substantially in parallel with the lift link 13. A long hole 34 is formed in the connecting portion of the rear pin 33, and the lower link 31 is movable back and forth over the length of the long hole 34. Reference numeral 35 denotes a bracket on the rear part of the mower deck 14, which attaches the rear end of the frame 15 to the lower link 3.
1 Attach the front pin 32.

The lift link 13 is provided with a hook-shaped stopper pin 36 which can move in and out of the outside.
6 It can be engaged with the upper surface of the deck frame 15 on the rear side, or can be switched to a state where it cannot be engaged. This stopper pin 3
Pulling out 6 allows the mower deck 14 to be brought into a state in which it can be engaged with the deck frame 15 and the mower deck 14 can be raised in the state B of the front upward slope C (FIG. 5).

When the stopper pin 36 is pushed into the lift link 13 on the inner side, when the lift link 13 is lifted, the mower deck 14 is pivoted around the connecting pin 26 in a forward-downward state at the front center of gravity. While the lower link 31 is moved to the front side by the length of the long hole 34, the mower deck 14 can be raised A in a parallel state (FIG. 3). By raising and lowering the mower deck 14, the mowing action can be performed accurately, the ridges can be easily crossed, and the like.
The bending angle of the transmission shaft 29 with respect to the input shaft 28, the PTO shaft 30, and the like can be reduced, so that vibration, abnormal noise, and the like can be reduced, and smooth transmission can be performed.

In FIG. 6, a different point from the above example is that a connecting portion formed by a connecting pin 26 between the deck frame 15 of the mower deck 14 and the lift link 13 on the vehicle body 6 side, and a long hole 36 is formed in the lift link 13. The mower deck 14 is configured to be slidable over the length of the long hole 36.
The mower deck 1 is connected between the deck frame 15 and the vehicle body 6 by a rod 38 which expands and contracts against a spring 37.
4 can be moved to the front side and can be moved by the length of the elongated hole 36 minutes.

During the mowing operation, the connecting pin 26 of the deck frame 15 is positioned at the rear end of the elongated hole 36 against the spring 37 due to the propulsion resistance of the mower deck 14. When the mower deck 14 is moved up by raising the mower deck 14, the resilient force of the spring 37 moves to the front side, and the connecting pin 26 is positioned at the front end of the elongated hole 36.

In the position where the mower deck 14 is thus raised, the mower deck 14 is moved forward to increase the length of the transmission shaft 29 of the input shaft 28 of the mower deck 14 and reduce the bending angle of the universal joint. Vibration and noise can be reduced. In addition, by moving the mower deck 14 toward the vehicle body 6 at the mowing position, the forward protrusion as the front mower is shortened to facilitate the mowing operation.

FIG. 7 differs from the above example in that a stopper 39 is provided on the lift link 13 so that the upward movement of the rear part of the mower deck 14 can be locked. When the rear portion of the mower deck 14 is suddenly moved up by the uneven portion of the mowing ground or the like, the mower deck 14 is received by the stopper 39 and large swinging can be prevented. Further, when the rear portion of the mower deck 14 is pushed upward, the lift link 13 is pushed up, and the entire mower deck 14 is moved upward.

[Brief description of the drawings]

FIG. 1 is a plan view of a steering wheel unit and a rear view of a tractor.

FIG. 2 is a plan view and a side view of the tractor.

FIG. 3 is a side view of a mower deck showing another embodiment.

FIG. 4 is a perspective view thereof.

FIG. 5 is an operation side view.

FIG. 6 is a side view of a mower deck showing another embodiment, and a plan view of a part thereof.

FIG. 7 is a side view of a mower deck showing a partially different embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steering handle 2 Power steering cylinder 3 Knuckle arm 4 Steering wheel 5 Kingpin

Continued on the front page (72) Inventor Norihito Yoshino 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. (Reference) 3D033 HA05 HA08 KA02 KA05 KA06 3D034 BB05 BC04 BC25 BC28 CB05 CC03 CC12 CC14

Claims (1)

[Claims] A knuckle which is steered and rotated by being connected to a power steering cylinder which expands and contracts based on operation of a steering handle is provided outside a top end of a king pin of a steered wheel. Tractor steering system.