Hydraulics and Loaders

Abstract

The invention relates to hydraulic technology, and in order to solve the problem of integration and sharing of pressure oil sources of braking, steering and working hydraulic systems on the existing loader, it provides a hydraulic system and a loader, wherein the load-sensitive liquid filling valve in the hydraulic system has a liquid filling valve. The oil circuit and the load pressure signal lead to the oil circuit, and the load pressure signal leads to the oil circuit to compare the pressure signal of the charging oil outlet with the pressure signal of the LS1 port and output the pressure with a higher pressure value from the LS2 port; The liquid oil outlet is connected with the accumulator and the service brake valve at the same time, and the LS1 port, LS2 port and P port of the load-sensing liquid charging valve are correspondingly connected with the LS1 port, LS port and P1 port of the load-sensing flow amplifying valve. The present invention increases the feedback of the load signal of the braking system, and selects the feedback with the load signal of the steering system to the steering pump to control the oil supply pressure of the steering pump.

Description

technical field

[0001] The present invention relates to a hydraulic technology, and more particularly, to a hydraulic system and a loader. Background technique

[0002] Loader is a kind of commonly used construction machinery. Its hydraulic system can be divided into braking system, steering hydraulic system and working hydraulic system according to its function.

[0003] The braking system is usually a full hydraulic braking system. The full hydraulic braking system includes a pressure oil source, a service brake valve and a service brake which are sequentially connected by pipelines. For safety requirements, several brakings can still be achieved after the engine of the loader suddenly loses power. The pressure oil source also includes the service brake accumulator and the charging valve.

[0004] For the purpose of reducing costs and saving energy, the braking system, steering hydraulic system and working hydraulic system are usually shared on the pressure oil source. ...

Examples

Embodiment Construction

[0027] Specific embodiments are described below with reference to the accompanying drawings.

[0028] figure 1 A hydraulic system of a loader is shown. The hydraulic system includes a full hydraulic braking system, a steering system, and a working hydraulic system.

[0029] The full hydraulic braking system includes a brake pressure oil source, a service brake valve 14 , a service brake, a parking brake valve 10 , and a parking brake 11 connected in sequence through pipelines.

[0030] The service brake includes a front axle brake 15 and a rear axle brake 16 . The service brake valve 14 is a dual oil circuit brake valve whose two oil outlet ends are correspondingly connected to the front axle brake 15 and the rear axle brake 16 . The oil outlet end of the parking brake valve 10 is connected to the parking brake 11 through a pipeline.

[0031] The brake pressure oil source includes a load-sensitive charging valve 8, a service brake accumulator, and a parking brake accumulato...

technical field

[0001] The present invention relates to a hydraulic technology, and more particularly, to a hydraulic system and a loader. Background technique

[0002] Loader is a kind of commonly used construction machinery. Its hydraulic system can be divided into braking system, steering hydraulic system and working hydraulic system according to its function.

[0003] The braking system is usually a full hydraulic braking system. The full hydraulic braking system includes a pressure oil source, a service brake valve and a service brake which are sequentially connected by pipelines. For safety requirements, several brakings can still be achieved after the engine of the loader suddenly loses power. The pressure oil source also includes the service brake accumulator and the charging valve.

[0004] For the purpose of reducing costs and saving energy, the braking system, steering hydraulic system and working hydraulic system are usually shared on the pressure oil source. ...

Examples

Embodiment Construction

[0027] Specific embodiments are described below with reference to the accompanying drawings.

[0028] figure 1 A hydraulic system of a loader is shown. The hydraulic system includes a full hydraulic braking system, a steering system, and a working hydraulic system.

[0029] The full hydraulic braking system includes a brake pressure oil source, a service brake valve 14 , a service brake, a parking brake valve 10 , and a parking brake 11 connected in sequence through pipelines.

[0030] The service brake includes a front axle brake 15 and a rear axle brake 16 . The service brake valve 14 is a dual oil circuit brake valve whose two oil outlet ends are correspondingly connected to the front axle brake 15 and the rear axle brake 16 . The oil outlet end of the parking brake valve 10 is connected to the parking brake 11 through a pipeline.

[0031] The brake pressure oil source includes a load-sensitive charging valve 8, a service brake accumulator, and a parking brake accumulato...

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