KR100357351B1 - Noise reduction valve assembly of vehicle steering system - Google Patents

Abstract

The present invention relates to a noise reduction valve assembly for steering of an automobile, wherein oil introduced through the oil inlet (3) formed in the valve body (1a) of the rotary valve (1) is the inflow protrusion (1d) and the inflow depression (2b) It is to reduce the noise due to the flow of oil by preventing the flow such as vortex is formed when moved to the left and right outlets (1b, 1c) through).

A characteristic configuration for this purpose is to process both edges of the inflow protrusions 1d formed at the oil inlet 3 of the valve body 1a with rounds (R, R ': Round), and the inside of the inflow depressions formed on the shaft. Rounded corners (R ": Round) reduce the noise by not forming a vortex-like flow when the oil flows in.

Description

Noise Reduction Valve Assembly for Car Steering {NOISE REDUCTION VALVE ASSEMBLY OF VEHICLE STEERING SYSTEM}

The present invention relates to a noise reduction valve assembly for steering of an automobile, and more particularly, to reduce the noise caused by the flow of oil rapidly flowing into the laminar flow of the flow of oil flowing in accordance with the opening and closing of the valve. It was made to be possible.

In general, the power steering for automobiles is provided with a rotary valve (1) in the torsion bar (4) in which the inner cylinder is moved left and right in accordance with the oil flowing in, the rotary valve (1) is generally as shown in FIG. As described above, the left and right outlet portions 1b and 1c, which are paths for selectively injecting oil into the torsion bar 4, are formed, and a valve body having an oil inlet 3, which is a passage through which oil is introduced, is formed. 1a and the shaft 2 which is connected to the steering shaft to the inside of the valve body 1a and has a return hole 2a in the center thereof.

Here, between the valve body (1a) and the shaft (2) is formed between the left and right outlets (1b, 1c) of the valve body (1a) as shown in Figure 2 so that the movement of the oil flows smoothly An inflow protrusion 1d protruding the oil inlet 3 and an inflow depression that distributes the oil introduced into the left and right outlets 1b and 1c to a size corresponding to the inflow protrusion 1d; 2b).

When the driver turns the steering wheel, the shaft 2 rotates so that the inflow protrusion 1d and the inflow depression 2b intersect as shown in FIG. It is not abrupt but gentle, reducing steering dissatisfaction.

However, as shown in FIG. 2, the inflow protrusions 1d and the inflow depressions 2b are shaped so that their ends are angled to each other, so that oil introduced through the oil inlet 3 is left and right outlets ( 1b, 1c) as it flows so rapidly that a flow such as vortex (K; Vortex) is formed at the corners, which not only prevents the smooth flow of the whole flow, but also causes structural problems such as noise caused by the flow. Will be.

The present invention has been invented to solve the above conventional problems, the main object of the invention is the oil introduced through the oil inlet formed in the valve body of the rotary valve to the left and right outlet through the inflow projection and inflow depression It is to reduce the noise caused by the oil flow by not forming a vortex-like flow when moving.

A characteristic configuration for this is to round both edges of the inflow protrusion formed in the oil inlet of the valve body, and to round the inner edge of the inflow depression formed in the shaft to move the inflow oil. It does not form a vortex-like flow to reduce noise.

1 is a configuration diagram showing the structure of a valve assembly of a rotary valve type in a general steering ball screw gear

FIG. 2 is an enlarged cross-sectional view taken along line A of FIG. 1 and illustrates a structure of a conventional valve assembly.

3 is an enlarged cross-sectional view taken along line A of FIG.

<Explanation of symbols for the main parts of the drawings>

1: Rotary Valve 1a: Valve Body

1b: left exit 1c: right exit

1d: inflow protrusion 2: axis

2a: Return hole 2b: Inflow depression

3: oil inlet 4: torsion bar

Hereinafter, the detailed configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the rotary valve 1 of the present invention has left and right outlet portions 1b and 1c which are paths through which oil selectively flows left and right through the torsion bar 4 and oil is introduced therethrough. Consists of a valve body (1a) having an oil inlet (3) that is a passage, and a shaft (2) having a return hole (2a) in the center of the valve body (1a) connected to the steering shaft Is the same as the conventional one.

As shown in FIG. 3, both edges of the inflow protrusions 1d constituting the oil inlet 3 formed between the left and right outlet portions 1b and 1c of the valve body 1a are illustrated in FIG. 3. In addition to being rounded (R, R ': Round), the inflow depression 2b distributing the oil introduced into the left and right outlets 1b and 1c while having a size corresponding to the inflow projections 1d. The inner edge of the edge is in the shape of a round (R ": Round).

Here, the rounds (R, R ', R ") formed at both corners of the inflow protrusion (1d) and the inner corner of the inflow depression (2b) is made of an arc that is part of a circle, or preferably fluid It consists of a part of the streamline shape, which is the laminar (Laminar) flow of.

As shown in FIG. 3, when the driver turns the steering wheel, the shaft 2 rotates so that the inflow protrusion 1d and the inflow recess 2b are shown in FIG. 3. Since it crosses together, it is the same as in the related art to reduce steering heterogeneity by smoothly and smoothly changing the hydraulic pressure with respect to the orifice cross-sectional area change during the movement of the hydraulic pressure.

In addition to the present invention, as shown in FIG. 3, the inflow protrusions 1d and the inflow depressions 2b may have rounded edges (R, R ', R ") shapes or portions of stream line shapes. When the oil flowing through the oil inlet (3) is moved to the left and right outlets (1b, 1c), a flow such as a vortex due to the rapid inflow is not formed at the corner portion, and the inflow with the inflow protrusion (1d) It flows to the left and right exit parts 1b and 1c while making a smooth flow along the edge of the depression 2b.

That is, noise caused by turbulence or vortex generated during the flow of the fluid is fundamentally eliminated.

As described above in detail, the present invention provides the inner edge portion of both the inlet portion 1d of the inlet protrusion portion 1d formed at the oil inlet 3 of the valve body 1a and the inlet portion 2b formed on the shaft 2. It is shaped as a round (R, R ', R ") or streamline to enhance the merchandise by fundamentally eliminating the cause of noise caused by the flow of oil that flows due to the rapid opening and closing of the valve.

Claims (2)

The left and right outlet portions 1b and 1c, which are paths through which oil selectively flows left and right, are formed, and the valve body 1a provided with an oil inlet 3, which is a passage through which oil flows, and the valve body ( In a steering valve assembly for a vehicle having a rotary valve (1) consisting of a shaft (2) having a return hole (2a) in the center thereof, connected to a steering shaft inward of 1a), Both corners of the inflow protrusion 1d are rounded (R, R ') with an arc that is part of a circle, and the inner edge of the inflow depression 2b having a size corresponding to the inflow protrusion 1d is also formed. A noise reduction valve assembly for a vehicle, characterized in that it forms a round (R ") shape as an arc part of a circle. delete