Rear Axle Steering Mechanism for Large Corn Harvester

Technical Field

The utility model relates to components of harvesting machinery, in particular to a rear axle steering mechanism for a large corn harvester.

Background Art

The rear axle is a component of the rear drive axle responsible for power transmission in large corn harvesters. It also serves to support and connect the rear wheels and plays a load-bearing role during steering.

Currently, rear axle steering mechanisms of large corn harvesters in China generally adopt a symmetrical dual-cylinder arrangement. During machining and assembly, strict positional tolerance control is required; otherwise, the steering angles of the wheels on both sides cannot be coordinated. Under harsh operating conditions, such structures exhibit poor stability and low load-bearing capacity.

Summary of the Invention

The purpose of this utility model is to provide a rear axle steering mechanism for a large corn harvester that simplifies the structure, reduces manufacturing cost, and improves load-bearing capacity.

To achieve the above objective, the technical solution adopted is as follows:

The rear axle steering mechanism comprises a rear axle body, a steering assembly, a steering tie rod, a wheel assembly, and a steering cylinder.

Steering assemblies are rotatably connected to both ends of the rear axle body.

Each steering assembly includes a steering arm, a steering kingpin, and a wheel spindle arranged on the steering arm.

The steering arm is connected to the lower end of the rear axle body through the steering kingpin.

The steering arm is rotatably connected to the wheel assembly located outside the rear axle body through the wheel spindle.

Both ends of the steering tie rod are respectively fixed to mounting holes at the ends of the steering arms.

A cylinder mounting plate is provided at the middle of the rear axle body.

The double-piston-rod ends of the steering cylinder are respectively provided with a left spherical joint and a right spherical joint.

The left spherical joint is connected to a spherical pin on the cylinder mounting plate.

The right spherical joint is connected to a spherical pin arranged at the middle of the steering arm.

Further, sliding pads closely fitted to the inner arc surfaces of the left and right spherical joints are embedded therein, and the sliding pads are made of polytetrafluoroethylene (PTFE).

Beneficial Effects

Compared with the prior art, the utility model has the following advantages:

Simple structure ensuring stable steering performance

A single double-piston-rod steering cylinder is used, reducing manufacturing cost

PTFE sliding pads reduce the friction coefficient between the spherical joints and spherical pins, improving safety and operational reliability

Enhanced load-bearing capacity

Description of Drawings

Figure 1: Front view structural diagram of the utility model

Figure 2: Top view structural diagram of the utility model

Reference numerals:

Rear axle body

Steering assembly

Steering arm

Steering kingpin

Wheel spindle

Steering tie rod

Wheel assembly

Steering cylinder

Cylinder mounting plate

Left spherical joint

Right spherical joint

Sliding pad

Detailed Description

As shown in Figures 1–2, the rear axle steering mechanism includes a rear axle body (1), steering assemblies (2), a steering tie rod (3), wheel assemblies (4), and a steering cylinder (5).

Steering assemblies (2) are rotatably connected to both ends of the rear axle body (1). Each steering assembly (2) includes a steering arm (21), a steering kingpin (22), and a wheel spindle (23). The steering arm (21) is connected to the lower end of the rear axle body (1) through the steering kingpin (22), and is rotatably connected to the wheel assembly (4) via the wheel spindle (23).

Both ends of the steering tie rod (3) are fixed to mounting holes at the ends of the steering arms (21). A cylinder mounting plate (6) is arranged at the middle of the rear axle body (1). The ends of the double piston rods of the steering cylinder (5) are respectively provided with a left spherical joint (7) and a right spherical joint (8). The left spherical joint (7) is connected to a spherical pin on the cylinder mounting plate (6), while the right spherical joint (8) is connected to a spherical pin located at the middle of the steering arm (21).

Preferably, sliding pads (9) made of PTFE are embedded in the inner arc surfaces of the left spherical joint (7) and right spherical joint (8), ensuring close fit.

This design enables a simplified structure, reduces manufacturing cost through the use of a single double-piston-rod steering cylinder (5), lowers friction via PTFE sliding pads (9), improves safety and reliability, and increases load capacity.

Except for the technical features described above, all other aspects belong to common knowledge in the field.