JPH0720473U - Oil pressure adjusting valve - Google Patents

Abstract

(57) [Summary] [Purpose] A hydraulic control valve that avoids the delay in pressure rise due to bubbles in oil. [Structure] A small-diameter cylinder (5) opened to the area (A) side and a large-diameter cylinder (3 opened to the area (B) side, in a partition wall (1) separating the areas (A) and (B) filled with oil. ), And an oil passage (1) consisting of a taper part (4) communicating the small diameter cylinder (5) and the large diameter cylinder (3).
2), and a floating ball (2) for preventing oil passage by a spherical surface contacting the tapered portion (4) is enclosed in a large diameter cylinder (3), the tapered portion (4) A recess (8) was provided on the contact surface with the floating ball (2).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic pressure control valve.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 3, a small diameter cylinder (5) opened to the area (A) side and a small diameter cylinder (5) opened to the area (B) side in a partition wall (1) separating the oil-filled areas (A) and (B). The large diameter cylinder (3) and the oil passage hole (12) consisting of the tapered portion (4) communicating the small diameter cylinder (5) and the large diameter cylinder (3) are provided, and the taper portion (4) is further provided. A hydraulic control valve is used in which a floating ball (2) that abuts a spherical surface and blocks oil passage is enclosed in a large diameter cylinder (3). When the pressure in the area (B) starts to rise higher than that in the area (A), the floating ball (2) collides with the taper part (4) from the area (B) to the area (A). Oil is blocked from flowing out, and the area (B) side becomes high pressure. For example, if a hydraulic circuit that responds to an increase in pressure in this area (B) is used with a hydraulic pressure regulating valve, and the oil in the area (B) contains bubbles (x), the bubbles will There was a problem that the response of the hydraulic circuit was poor because it was compressed and the rise in oil pressure was slowed.

[0003]

[Problems to be solved by the device]

 In view of the above circumstances, the present invention provides a hydraulic pressure control valve that avoids a delay in pressure increase due to bubbles in oil.

[0004]

[Means for Solving the Problems]

 The hydraulic pressure adjusting valve of the present invention has a small-diameter cylinder (5) opened to the area (A) side, a small-diameter cylinder (5) opened to the area (A) side, and an opening to the area (B) side in a partition wall (1) separating the areas (A) and (B) filled with oil. The large diameter cylinder (3) and the oil passage hole (12) consisting of the tapered portion (4) communicating the small diameter cylinder (5) and the large diameter cylinder (3) are provided, and the tapered portion (4) is further provided. In a hydraulic pressure regulating valve in which a floating ball (2) that abuts a spherical surface and blocks oil passage is enclosed in a large-diameter cylinder (3), a concave portion () is formed on the contact surface of the tapered portion (4) with the floating ball (2). 8) is provided.

[0005]

[Action]

 According to the hydraulic pressure adjusting valve of the present invention, since the concave portion (8) is provided on the contact surface of the taper portion (4) with the floating ball (2), the space between the taper portion (4) and the floating ball (2) is increased. A gap (9) is formed in the gap (9), and the air bubbles (x) contained in the oil in the area (B) can escape to the area (A) side from the gap (9).

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings showing examples.

FIG. 1 is a sectional view showing a hydraulic pressure regulating valve according to an embodiment of the present invention. As shown in the figure, the hydraulic pressure regulating valve of the present invention penetrates a partition wall (1) separating the oil-filled areas (A) and (B), and connects the oil holes (1) to the areas (A) and (B). 2) is provided. The oil passage hole (12) has a small diameter cylinder (5) opened to the area (A) side, a large diameter cylinder (3) opened to the area (B) side, and the small diameter cylinder (5) and the large diameter cylinder. It is composed of a tapered portion (4) communicating with the cylinder (3). On the area (B) side of the large diameter cylinder (3), the hole diameter is narrowed by a lid (6) having an oil passage hole (7), and a small diameter cylinder (3) is provided inside the large diameter cylinder (3). A floating ball (2) with a larger diameter than 5) is enclosed. In the floating ball (2), when the hydraulic pressure in the area (B) becomes higher than that in the area (A), the spherical surface comes into contact with the tapered portion (4) to allow the oil to pass through the areas (A) and (B). Cut off.

A feature of the present invention is that, as shown in FIGS. 1 and 2, a concave portion (8) is provided on the contact surface of the tapered portion (4) with the floating ball (2). Therefore, the floating ball (2) abuts on the convex portion (10) between the concave portions (8) and (8), and at the same time, forms a gap (9) consisting of the concave portion (8) and the spherical surface of the floating ball (2). The size of the gap (9) is determined in consideration of the resistance to air and the resistance to oil when passing through the gap (9). That is, since the viscosity of oil is higher than that of the bubbles (x), the resistance is increased by adjusting the area of the gap (9) so that only the oil is blocked and the bubbles (x) pass. Can be Therefore, when the pressure in the area (B) becomes larger than that in the area (A), the hydraulic pressure control valve of the present invention is contained in the oil through the clearance (9) from the area (B) to the area (A). Only bubbles (x) can escape. Therefore, for example, when the hydraulic circuit that responds to the increase in the pressure in this area (B) is used together with the hydraulic pressure adjusting valve, the bubbles (x) that cause the increase in the pressure of the oil in the area (B) to be delayed in the area ( Since it is discharged from inside B), the response of the hydraulic circuit is improved.

[0009]

[Effect of device]

 Since the hydraulic pressure control valve of the present invention can discharge only the bubbles contained in the oil on the high pressure side, it is possible to avoid the delay in the pressure increase due to the bubbles.

[Brief description of drawings]

FIG. 1 is a sectional view showing a hydraulic pressure regulating valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a cross-sectional view showing a conventional hydraulic pressure control valve.

[Explanation of symbols]

 1 Partition 2 Floating Ball 3 Large Diameter Cylinder 4 Tapered Part 5 Small Diameter Cylinder 8 Recess 12 Oil Passing Hole A Area B Area x Bubble

Claims (1)

[Scope of utility model registration request] 1. Areas (A) and (B) filled with oil
A small diameter cylinder (5) opened to the area (A) side, a large diameter cylinder (3) opened to the area (B) side, and the small diameter cylinder (5) and the large diameter cylinder (3) on a partition wall (1) separating ) Communicating with the oil passage hole (1
2), and a floating ball (2) for preventing oil passage by a spherical surface contacting the tapered portion (4) is enclosed in a large diameter cylinder (3), the tapered portion (4) A hydraulic pressure regulating valve characterized in that a concave portion (8) is provided on the contact surface with the floating ball (2).