JPH0451261Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a check valve that prevents backflow of working fluid.

(Prior Art) For example, in a fully hydraulic power steering system, there is a check valve inserted into a hydraulic circuit to prevent backflow of hydraulic oil, as disclosed in Japanese Utility Model Application Laid-Open No. 61-87269.

As shown in FIG. 3, a valve seat portion 12 is formed inside a connector housing 10 having a passage 11 communicating with the hydraulic circuit, facing the passage 11, and is seated on this valve seat portion 12. A ball valve 13 is arranged.

The ball valve 13 is located on the downstream side of the valve seat portion 12 with respect to the flow of hydraulic oil in the normal direction.
When the hydraulic oil flows in the opposite direction, it is seated on the valve seat portion 12 to prevent the reverse flow.

In order to prevent the ball valve 13 from falling under normal conditions, and also to suppress its behavior and prevent the generation of vibrations and abnormal noises,
The connector housing 10 includes a valve seat portion 1.
2 and offset from the center of the passage 11, the pin 14 is press-fitted from a direction perpendicular to the axis of the passage, and the ball valve 13 is moved between the pin 14 and the inner wall by the flow of hydraulic oil. By ensuring that the ball valve 13 is sandwiched between the wider gaps, the ball valve 13 is stably held.

When the pin 14 passes through the center of the passage 11,
Since the gaps between the pin 14 and the left and right walls are equal, it is difficult for the ball valve 13 to stay stably on either side, and the flow of hydraulic oil causes the ball valve 13 to jump left and right around the pin 14. This causes repeated collisions with the inner walls, causing vibrations and noise.

(Problem to be solved by the invention) By the way, the connector housing 10
In order to press-fit the pin 14 eccentrically into the connector housing 10, as shown in FIG.
It is necessary to form the pin hole 15 at a position eccentric from the center of the pin hole 15.

The pin hole 15 is generally drilled with a drill 16, but especially when using a thin drill with a small diameter, if the pin hole 15 is drilled at a position eccentric from the center, the pin hole 15 may be drilled at right angles to the inner and outer circumferences of the cylindrical surface. Since the drill 16 cannot be applied from the direction of
There were processing problems such as difficulty in forming straight holes and non-circular cross sections of the holes.

In addition, in Japanese Utility Model Application Publication No. 56-124362, there is a device in which a pin supporting the ball valve is inserted diagonally with respect to the vertical direction, and the ball valve is held diagonally downward. Since the drill hits the cylindrical surface obliquely when drilling the pin hole, problems similar to those described above occur, making it difficult to drill the hole accurately and easily causing the drill to bend or break.

The present invention aims to solve such problems.

(Means for Solving the Problem) Therefore, the present invention forms a valve seat portion facing the passage inside the connector housing, and arranges a pin across the passage facing the valve seat portion. In a check valve in which a ball valve is interposed between the pin and the valve seat, the pin is arranged in a plane passing through the axis of the passage and orthogonal to the axis, and the ball valve is installed on either inner wall with the pin in between. A recess is formed to accommodate a portion of the.

(Function) The distance between the left and right inner walls across the pin is greater when a recess is formed, and a ball valve that partially rides on the pin will always lean toward the side with the larger distance. Therefore, in response to the normal flow of hydraulic oil, the ball valve is held between the pin and the recess formed in one inner wall, and is stably held without jumping up.

In addition, since the pin is placed on a plane that passes through the axis of the passage and is orthogonal to the axis, when drilling the pin hole to insert and support the pin, the tip of the drill hits the inner and outer circumferences of the connector housing at right angles. Therefore, it has good workability and allows accurate drilling.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

In order to insert and support the pin 14 in the connector housing 10, a pin hole 15 is formed through the connector housing 10 in a plane perpendicular to the axis of the internal passage 11 and passing through the axis, as shown.

The pin 14 is inserted and supported (press-fitted) into the pin hole 15 across the passage 11.

The ball valve 13 has a pin 14 and a valve seat part 12.
It is interposed between the valve seat portion 12 and the valve seat portion 12, and moves toward and away from the valve seat portion 12 depending on the flow direction of the hydraulic oil.

A recess 18 for accommodating a portion of the ball valve 13 is formed in one of the left and right inner walls 17A, 17 with the pin 14 in between.

In this embodiment, the recess 18 is formed into a groove shape by drilling from the open end of the passage 11 parallel to the axis of the passage 11, but it may also be formed integrally when the connector housing 10 is cast. Of course, it is also possible.

In this way, the ball valve 1 is attached to one inner wall 17A.
Since a recess 18 is formed to accommodate a part of the inner wall 1, the inner wall 1
17A has wider spacing than 7B, and pin 1
Ball valve 13 partially supported using 4 as a fulcrum
is always stably held between the inner wall 17A and the wider inner wall 17A.

Therefore, the ball valve 13 will not jump due to the flow of hydraulic oil under normal conditions, and the inner wall 17A and 1
It is possible to suppress the generation of vibrations and abnormal noises due to collisions with 7B.

On the other hand, the pin hole 15 into which the pin 14 is inserted and supported is
Since it is formed in a plane that passes through the axis of the passage 11 and is perpendicular to the axis, the tip of the drill hits the inner and outer cylindrical surfaces of the connector housing 10 at right angles when drilling the pin hole 15, and therefore the drill escapes. It is difficult to cause bending or bending, and workability is greatly improved. Therefore, pin holes can be drilled accurately and efficiently even with a thin drill.

(Effects of the invention) As described above, according to the invention, a recess for storing a part of the ball valve is formed on one inner wall of the pin passing through the axis of the passage, so that there is a gap between the recess and the pin. This allows the ball valve to be held stably and prevents vibration and noise from occurring.

In addition, since the pin hole for inserting and supporting the pin is formed in a direction perpendicular to the cylindrical surface of the connector housing through the axis, it is possible to reliably prevent the drill from bending or breaking when drilling the pin hole. , it is possible to significantly improve the machining accuracy and workability of pin holes.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a partial plan view, Fig. 3 is a sectional view of a conventional example, and Fig. 4 is a sectional view showing an embodiment of the present invention.
The figure is also a partially explanatory plan view. 10... Connector housing, 11... Passage,
12...Valve seat part, 14...Pin, 15...
...pin hole, 17A, 17B...inner wall, 18...recess.

Claims (1)

[Scope of utility model registration request] A valve seat portion is formed facing the passage inside the connector housing, and a pin is provided across the passage facing the valve seat portion, and a ball valve is interposed between the pin and the valve seat portion. In the check valve, the pin is disposed on a plane passing through the axis of the passageway and orthogonal to the axis, and a recess for housing a part of the ball valve is formed on one of the inner walls with the pin in between. Check valve.