JPH0647527Y2 - Foreign object capture device for hydraulic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a device for capturing foreign matter mixed in an oil passage in a hydraulic device such as a hydraulic valve, a safety valve, a poppet valve, and a hydraulic pump motor.

[Conventional technology]

If foreign matter is mixed in the oil flowing through the oil passage of the hydraulic equipment, it adversely affects the operation of the hydraulic equipment.Therefore, it is necessary to capture the foreign matter. Foreign matter is captured.

[Problems to be solved by the device]

However, it is not easy to install a wire mesh in the oil passage of the hydraulic equipment, and it is difficult to fix it securely and it may come off, which is unreliable and requires a space for installing the wire mesh. Therefore, the device becomes larger and more complicated.

Therefore, an object of the present invention is to provide a foreign matter capturing device for a hydraulic device that is capable of capturing foreign matter without attaching a wire mesh.

[Means and Actions for Solving the Problems]

A large diameter part and a small diameter part are formed in the middle of the oil passage of the device body, and a ring is fitted to the large diameter part to form a minute gap for oil flow between the ring and the small diameter part. The foreign matter in the oil can be captured when flowing through the gap.

〔Example〕

As shown in FIG. 1, the valve body 1 has a small diameter hole 2 and a large diameter hole 3.
Are bored concentrically, an inflow hole 4 is formed in the large diameter hole 3, and a sleeve 5 is fitted over the small diameter hole 2 and the large diameter hole 3, and the sleeve 5 is Has a small-diameter tip portion 7, which is fitted with the seal material 6, and is sealed with the seal material 6, an intermediate large-diameter portion 8, and a large-diameter base end portion 10, which is fitted with the large-diameter hole 3 and is sealed with the seal material 9, Port that opens to shaft hole 11 at the tip 7
12 is perforated, a spool 13 is slidably fitted into the shaft hole 11, and the spool 13 has a small diameter portion 14 opening to the port 12 and a seat 16 press-contacting a seat seat 15,
In addition, the seat 16 is slidably biased by the spring 17 in the direction in which the seat 16 is pressed against the seat 15, and the seat 16 comes into contact with the movable rod 19 of the solenoid 18 attached to the valve body 1. Further, the spool 13 is provided with a small diameter portion 14. A notch 20 communicating with the seat 15 side is formed,
By controlling the energization of the solenoid 18, the flow rate flowing from the inflow hole 4 to the outlet side 21 can be controlled.

In such a hydraulic device, malfunction occurs when foreign matter enters the notch 20, so one end of the ring 22 is fitted and attached to the intermediate large diameter portion 8 of the sleeve 5, and the other end of the ring 22 is attached to the small tip end. A small annular gap 23 protruding between the two
Is formed so that the oil flows into the port 12 through the minute gap 23, and foreign substances in the oil are captured when passing through the minute gap 23.

[Effect of device]

Since the foreign matter in the oil can be captured by the minute gap 23 formed between the ring 22 and the small diameter portion, like a conventional hydraulic device,
It is possible to capture foreign matter in the oil flowing through the oil passage of hydraulic equipment without installing a wire mesh in the middle of the oil path, and it is not necessary to install the wire mesh troublesomely, and it is highly reliable because it does not come off. Not only that, since the ring 22 may be attached, no extra space is required, so that the hydraulic device does not become large or complicated.

[Brief description of drawings]

 FIG. 1 is a sectional view showing an embodiment of the present invention. 22 is a ring and 23 is a minute gap.

Claims (1)

[Scope of utility model registration request] 1. A large diameter portion and a small diameter portion are formed in the middle of an oil passage of a device body, and one end side of a ring 22 is fitted to the large diameter portion so that the other end side projects into the small diameter portion, A foreign matter capturing device for hydraulic equipment, characterized in that a minute gap (23) through which oil flows is formed between the ring (22) and the small diameter portion.