SU165987A1 - HYDRAULIC STEERING CONTROL TRACK ^ RV type - Google Patents

Description

Hydraulic steering gear of the following type is known, mainly excavators and cranes on a wheeled vehicle. It includes a steering gear with a steering wheel and a bipod, a pump, a tank, a pressure and oil lines and a valve, rigidly welded, to the rods of the auxiliary cylinders. The cavities of the latter communicate with the cavities of the actuating cylinder, which act with the help of levers and t on the driven wheels.

The closed circulation systems thus created are fed in the event of leakage of working fluid from the tank, through check valves, which also serve to initially fill the working fluid with the three transporting machines on the trailer. The make-up of the closed hydraulic system from the tank is less reliable than the make-up under pressure, and it makes possible the penetration of air into the hydraulic system, which breaks the rigid connection between the steering wheel and the steered wheels, creating the danger of movement.

The initial filling of a closed hydraulic system with a liquid and pumping it in order to displace air takes considerable time, since the liquid goes by gravity. In addition, when towing the mashina, the piston of the actuating cylinder moves and the pistons of the auxiliary cylinder are at rest.

which leads to a deregulation of the system and requires adjustment after towing.

The purpose of the described invention is to provide reliable hydraulic connection between

steering wheels and steering wheel and free flowing of working fluid from the cavities of the auxiliary cylinders to the tank when towing the excavator. This is achieved by the fact that the pumping and pumping-free cavities of each of the auxiliary cylinders are connected by pipelines, which include check valves and adjustment valves. The pimples and the drain line are connected by a pipeline, which includes

pressure valve.

In order to reduce the dynamic loads on the bipod of the steering mechanism and the rods of the auxiliary cylinders, the latter can be fixed still and the bipod

The steering gear can be connected to the distributor via a connecting rod.

Pa the drawing shows a diagram of the steering steering. It consists of a steering steering gear L of distributor 2, an oil tank 3, a pump 4, a pressure valve 5, a filter 6, two adjusting valves 7, two check valves 5, a hydraulic rotating joint 9. This connection serves

on the chassis frame and fixed actuating cylinder 10, acting through a system of levers and t on the front wheels 11. The distributor housing is rigidly connected to the rods of the fixed fixed auxiliary twin cylinder 12, and the spool is pivotally connected to the connecting rod 13 of the steering mechanism.

Check valves stand on the lines that connect the pumping cavities of the double cylinder with protivozhazh, pumpless and provide pressure under the pressure of both closed hydraulic systems in each operating cycle.

Adjustment valves, shunt check valves, serve to bring in the pistons of the twin and actuating cylinders to a consistent position. To do this, open one of the cranes 7 and turn the steering wheel of the steering mechanism until the pistons of the auxiliary 12 and the executive 10 cylinders are in the same, for example, extreme position.

This completes the adjustment. Having closed the adjusting valve, they restore the rigid connection between the pistons of both cylinders.

Instead of the simple check valve and crane 7 shown in the diagram, one unit-controlled check valve is used, which has a device that allows liquid to flow through the valve in the opposite direction.

Before transporting the car on a trailer, screw 14 should open the pressure spool located between pressure 15 and drain 16 lines to the drain. During transport, the piston of the actuating cylinder 10 receives movement from the towing arm through the pull rod system, and the piston displaced by the piston of the actuating cylinder / (the oil displaces the pistons of the auxiliary cylinder 12. These pistons, in turn, displace the oil through the distributor and filter or the open discharge valve tank 3.

With this method of towing, there is no consistent piston position.

The auxiliary twin cylinder is fixed to the turntable, and the valve spool is connected to the follower bipod 17, which plays the role of a crank, by means of a connecting rod. With such an attachment, the rods of the auxiliary cylinder and their compaction, as well as the tracking of the bipod, do not feel the force from the own weight of the structure and from the dynamic loads arising from the operation of the excavator and driving over uneven terrain.

Subject invention

Claims (2)

1. The hydraulic steering is of the following type, mainly excavators and cranes on the pneumowheel, including a steering mechanism with a steering wheel and a bipod, a pump, a tank, a pressure and drain lines, and a distributor rigidly attached to the rods of the auxiliary cylinders, the cavities of which communicate with the cavities of the actuating cylinder acting by means of levers and t on controlled wheels, characterized in that ensuring reliable hydraulic communication between the steering wheels and the steering wheel and ensuring free flow of working fluid from the cavities of the auxiliary cylinders to the tank when towing an excavator, pumping and pumpless cavities of each of the auxiliary cylinders are interconnected by pipelines, which include check valves and control valves, and the discharge and drain lines are interconnected by a pipeline that includes a pressure spool . 2. Hydraulic steering according to claim 1, characterized in that, in order to reduce the dynamic loads on the bipod of the steering mechanism and the rods of the auxiliary cylinders, the latter are fixed, and the bipod of the steering mechanism is connected to the distributor by means of a connecting rod.