RU230212U1 - Device for flushing the hydraulic power steering system - Google Patents

Abstract

The utility model relates to mechanical engineering and transport, namely to a device for flushing and cleaning a hydraulic power steering (HPS) system. The device (1) comprises a suction line (3) for flushing, a return line (4) for flushing, on which a filter element (13) is installed, as well as a container for flushing fluid (1) connected to the suction (3) and return (4) lines. Moreover, the suction line (3) is designed with the possibility of connection to the discharge pipeline (6) of the HPS system (2) in front of the pump (10), and the return line (4) is designed with the possibility of connection to the return pipeline (7) of the HPS system (2) between the steering mechanism (1) and the tank (9) for the working fluid. On the return line (4) before the filter element (13) a three-way valve (12) is installed, forming a branch to which the outlet line (5) with a container for used oil (14) is connected. The technical result is to ensure flushing of the power steering system with the removal of contaminated working fluid (oil) without disassembling the system. 1 ref. f-ly, 1 fig.

Description

[01] Field of technology

[02] The utility model relates to the fields of mechanical engineering and transport, namely to a device for flushing (cleaning) the hydraulic power steering (HPS) system.

[03] State of the Art

[04] Various plug-in devices for cleaning hydraulic systems are known from the prior art. In particular, Russian patent RU 2616733, 18.04.2021 describes a device containing a filter element, a programmable relay and a pump. In this case, this device is connected to the hydraulic system tank. The disadvantage of the device is the use of a separate pump, which complicates the design, as well as the impossibility of flushing the entire power steering system.

[05] Chinese application CN 111003060 A, 14.04.2020 (the closest analogue) describes a cleaning unit for power steering and braking systems, which is an integral part of the hydraulic system of a vehicle. The hydraulic system contains a tank for working fluid as its main components, to which a suction line for flushing (a line running from the tank to the pump, on which an oil suction filter is installed) and a return line for flushing (a line running from the steering gear back to the tank) are connected. The suction line runs to the pump, and the return flushing line is equipped with a filter element. The disadvantage of this unit is that it is built into the hydraulic system and only provides filtration (cleaning) of the contaminated flow without replacing the used working fluid. In this case, flushing the units of such a system requires disassembling it.

[06] Thus, the technical problem that the claimed utility model is aimed at solving is the impossibility of flushing the units without significant intervention in the power steering system.

[07] Disclosure of the essence of the utility model

[08] The technical result of the utility model is to improve the quality of cleaning the power steering system without disassembling it by flushing the power steering system with working fluid (oil) circulating through the flushing device and the power steering system, with periodic removal of contaminated working fluid (oil) from the power steering system circuit.

[09] The specified technical result is achieved due to the fact that the device for flushing the hydraulic power steering system comprises a suction line for flushing, a return line for flushing, on which a filter element and a container for flushing fluid are installed, connected to the suction and return lines. Moreover, the suction line is designed with the possibility of connecting to the pressure pipeline of the power steering system in front of the pump, and the return line is designed with the possibility of connecting to the return pipeline of the power steering system between the steering mechanism and the reservoir for the working fluid. On the return line in front of the filter element, a three-way valve is installed, forming a branch, to which a discharge line with a container for the used flushing fluid is connected.

[010] In a particular case of the device implementation, the suction line is designed with the possibility of connection to the tank for the working fluid of the power steering system.

[011] Brief description of drawings

[012] The utility model is illustrated by a drawing showing a diagram of a device for flushing connected to the power steering system.

[013] The elements of the device and system are designated on the drawing by the following positions:

1 - power steering system flushing device,

2 - power steering system,

3 - suction flush line,

4 - return flush line,

5 - outlet line,

6 - power steering system pressure pipeline,

7 - return pipeline of the power steering system,

8 - container for washing liquid,

9 - working fluid tank,

10 - pump,

11 - steering mechanism,

12 - three-way valve,

13 - filter element,

14 - container for used washing liquid,

15 - overlap,

16 - adapter.

[014] Implementation of a utility model

[015] The claimed device (1) is intended for flushing the power steering system (2) of a vehicle. Such a power steering system (2) includes a closed circuit formed by a pressure (6) and return (7) pipelines connecting a reservoir (9) for the working fluid (oil) and the steering mechanism (11) of the system. In this case, a pump (10) of the power steering system is installed on the pressure pipeline.

[016] The flushing device (1) is a ready-to-use assembled device in which all the elements of the design are placed in a single housing or on a single base (not shown in the drawing) for ease of connection and safety of operation. The flushing device (1) includes a tank (8) for flushing liquid (oil), a suction line (3) for flushing and a return line (4) for flushing connected to the tank, as well as a discharge line (5) connected to a branch of the return line (4).

[017] The suction line (3) of the device is connected to the discharge pipeline (6) of the power steering system. This connection of the line (3) can be carried out to the neck of the tank (6) for the working fluid using an adapter (16). In another embodiment of the utility model, the tank (6) can be dismantled, and the connection can be carried out directly to the hose of the discharge pipeline (6).

[018] The return line (4) for flushing the device is connected to the return pipeline (7) between the steering gear (11) and the tank (9) by means of an adapter (16). In this case, the end of the return pipeline (7) is plugged, ensuring that the supply of working fluid to the tank (9) of the system (1) is shut off (15).

[019] A three-way valve (12) and a filter element (13) are located on the return line (4) of the flush.

[020] The three-way valve (12) forms a branch of the return line (4), to which the outlet line (5) of the device is connected, at the end of which a container (14) for the waste liquid (oil) is installed. In this way, the three-way valve (12) switches the direction of the contaminated flow between the container (8) for the flushing liquid and the container (14) for the waste flushing liquid.

[021] The device (1) operates as follows.

[022] When the pump (10) of the system is turned on, the flushing liquid (oil) from the tank (8) enters the reservoir (9) of the working liquid via the suction line (3) of the device and then, passing through the pump (10), enters the steering mechanism (11) of the system and, together with wear products, is drawn into the return line (4) of the device (1). In the main operating position, the three-way valve (12) closes the discharge line (5), and the return line (4) is open, therefore the contaminated flow enters the filter element (13), is cleaned and returned to the tank (8), ensuring the circulation of the flushing liquid through the flushing device (1) and the power steering system (2). When the circulating flow is contaminated, the three-way valve (12) switches to the discharge line (5) and the contaminated flow enters the tank (14) for used flushing liquid for its disposal.

[023] Thus, the device (1) allows filtering out wear products with a particle size of 5 µm and above with minimal resistance to fluid flow at a flow rate of up to 14 l/min, and also replacing more than 90% of the working fluid (oil) of the power steering system using the substitution method.

[024] This device is suitable for most vehicles with power steering. The device uses the oil recommended by the manufacturer without the use of solvents. When using the device, the power steering system operates in normal mode under idle load, which allows the power steering units to heat up naturally to operating temperature and cool quickly when draining the used oil and adding new oil. As a result, the deposited wear products in the swirl zones and hidden surfaces (for example, technological holes in the manufacture of units), as well as on the walls of the units, the power steering system are taken in by the oil flow. The used oil is drained during operation by turning the three-way valve.

[025] The work can be carried out by one person without outside help. The device does not contain electrical components and is supplied assembled, so for work it is enough to connect two hoses to the return pipe and to the neck of the tank, which ensures minimal intervention in the power steering system and reduces errors associated with the human factor to a minimum. Flushing can be carried out for an unlimited time until the required cleanliness is achieved.

[026] Thus, the claimed device is characterized by a simple and reliable design, ease of installation and operation, as well as high quality cleaning of the power steering system due to the replacement of contaminated working fluid of the system with clean flushing fluid and periodic removal of waste fluid from the system circuit.

Claims (2)

1. A device (1) for flushing a hydraulic power steering (PS) system (2) comprising a suction line (3) for flushing and a return line (4) for flushing, on which a filter element (13) is installed, characterized in that it comprises a container for flushing fluid (8) connected to the return line (4) after the filter element (13) and to the suction line (3), wherein the suction line (3) is designed with the possibility of being connected to the discharge line (6) of the PS system (2) in front of the PS pump (10), and the return line (4) is designed with the possibility of being connected to the return line (7) of the PS system (2) between the steering gear (1) and the tank (9) for the PS working fluid, wherein a three-way valve (12) is installed on the return line (4) in front of the filter element (13), forming a branch to which a discharge line (5) with a container is connected (14) for the used flushing liquid and the three-way valve (12), depending on its operating position, is designed with the possibility of directing the flow of flushing liquid through the filter element (13) into the tank (8) for flushing liquid or through the discharge line (5) into the tank (14) for the used flushing liquid. 2. The device according to item 1, characterized in that the suction line (3) is designed with the possibility of connection to the tank (9) for the working fluid of the power steering system (2).