RU2434775C1 - Automotive steering mechanism priority valve - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to machine building, namely, to steering transfer mechanisms. Proposed valve consists of body accommodating continuous-action operating valve with two inlets from two pressure lines, two lines of supply for additional using equipment, one line of proportioning pump and two control lines. Besides, said valve has four adjusting edges, one control the flow from first pressure line to first line of first additional using equipment. Second edge controls proportioning pump supply flow. Third edge controls flow from second pressure line to proportioning pump supply line. Fourth edge controls flow from second pressure line to second line of additional using equipment. Priority valve incorporates also operating valve return spring and check valve with its outlet built in proportioning pump supply line from third adjusted edge. Proportioning pump supply line from third adjusting edge and check valve are arranged in operating valve body.

EFFECT: simple and compact design.

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Description

The invention relates to a transport mechanical engineering, namely to steering mechanisms of vehicles. Known priority valve of the steering mechanism of the vehicle, consisting of a housing with a continuous spool located in it, having inlets from two pressure lines, two power lines of an additional consumer, one power line of the hydraulic steering wheel and two control lines and having four adjusting edges connected in series along the spool , one of which regulates the flow from the first pressure line to the first line of the additional consumer, the second edge regulates the flow going to power the hydraulic steering wheel, t the edge adjusts the flow from the second pressure line to the power steering line, and the fourth edge controls the flow from the second pressure line to the second line of the additional consumer, and the priority valve also includes a spool return spring and a check valve integrated with its output into the power steering line from the third regulated edges. A disadvantage of the known priority valve is the external arrangement of the non-return valve and the line leading to it, which reduces compactness and complicates the design of the priority valve [1].

The objective of the invention is to remedy this drawback. The problem is solved in that the power line of the hydraulic steering wheel from the third regulated edge and the check valve itself are made in the body of the distribution valve.

Figures 1, 2 and 3 are diagrams of a steering mechanism with a new priority valve in various operating modes. The steering mechanism of the vehicle contains a hydraulic steering wheel 1, executive hydraulic cylinders 2 and a priority valve 3 connected by pressure lines 4 and 5 with power sources, power lines 6 and 7 with additional consumers, line 8 with a hydraulic steering pressure, control line 9 with a hydraulic steering control line and a line control 10 with a line 8 of the pressure of the hydraulic steering wheel. The hydraulic steering wheel is connected by line 11 with a drain into the tank. The priority valve 3 comprises a housing 12 with a continuous-acting distributor valve 13 placed therein with a return spring 14, in the body of which a check valve 15 with a return spring 16 and a supply line 17 is made. The spool is made with four control edges:

the first edge "A" is the edge of the flow control from line 4 to line 6;

the second edge "B" is the edge of the flow control from line 4 to the hydraulic steering wheel;

the third edge "B" is the edge of the flow control from line 5 to the hydraulic steering wheel;

the fourth edge "G" is the edge of the flow control from line 5 to line 7.

Under these edges, cylindrical bores 18 are made in the housing to allow flow of the working fluid. The principle of operation of the priority valve is described by the example of its joint work with a hydraulic steering wheel having a control line.

In the neutral position of the hydraulic steering shaft (Fig. 1), the control line in the hydraulic steering wheel and, therefore, the control line 9 of the priority valve are connected to the drain. The control line 10 is constantly connected to the pressure line 8 of the hydraulic steering wheel. The spool 13 of the priority valve is shifted towards the compression of the return spring 14 and the opening of the edge "A", connecting the pressure line 4 to the additional consumer through the supply line 6. At the same time, line 5 through the edge "G" is connected to another consumer through line 7. When working together the steering system and the additional consumer (figure 2) and increasing pressure in the pressure line 4 to a value greater than in the pressure line 8 of the hydraulic steering wheel, the priority valve spool moves towards partially closing the edge "B" by have needed to maintain pressure in the line 8 at the same level. With an increase in the rotational speed of the hydraulic steering shaft (Fig. 3), the control lines 9 and 10 are connected in the hydraulic steering wheel, the pressure on the ends of the spool of the priority valve begins to equalize and the spool, under the influence of the return spring 14, moves to the position at which the pressure line 4 is disconnected from line 6 of the additional consumer and connects only to line 8 of the pressure of the hydraulic steering wheel. In this case, the pressure line 5 through the supply line 17 and the check valve 15 is connected to the line 8 and at the same time through the edge "G" - with the second additional consumer via line 7. With an increase in the flow of power by the hydraulic steering wheel from the pressure line 4 or in the absence thereof, for example if the engine stalls, when the power pump is broken or the pressure line is broken, the pressure drop between the control lines 9 and 10 decreases and the spool moves to the side of completely closing edge “A”, opening edge “B” and closing edge “G”, as a result those that flow from the pressure supply line 5 is also applied partially or entirely in the power line 8 gidrorulya. The location of the check valve 15 and the supply line 17 in the body of the spool allows you to exclude one of the bores 18 in the body of the priority valve and significantly reduce overall dimensions.

The source of information

1. Passport “Valves of priority type OKP”, Ukraine, Odessa, CJSC “Stroy-hydraulics”. 2003 year

Claims (1)

The priority valve of the steering mechanism of the vehicle, consisting of a housing with a continuous control valve located in it, having inlets from two pressure lines, two power lines of an additional consumer, one power line of the hydraulic steering wheel and two control lines and having four adjusting edges connected in series along the spool , one of which regulates the flow from the first pressure line to the first line of the additional consumer, the second edge regulates the flow going to the power supply drourul, the third edge regulates the flow from the second pressure line to the power steering line, and the fourth edge regulates the flow from the second pressure line to the second line of the additional consumer, and the priority valve also contains a spool return spring and a check valve integrated with its output into the power steering line from the third adjustable edge, characterized in that the power line of the hydraulic steering wheel from the third adjustment edge and the check valve itself are made in the body of the distribution valve.

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