JPH0256209A - Bidirectional hydraulic hose provided with filter - Google Patents

Abstract

PURPOSE:To filter off dust in the title hydraulic hose by providing a joint member furnished with a conical filter medium directed inward on both ends of the hose main body, and making a small hole in the filter medium at a position shifted from the center. CONSTITUTION:The joint parts 1A and 1B are freely rotatably fixed respectively on both ends of the bidirectional hose provided with a filter. Joints 1A and 1B are freely rotatably inserted into one end of the hose main body 2 through filter mounting parts 5A and 5B. The conical filter mediums 17A and 17B made of a fine meshed wire gauze, etc., are inserted into the tips of the filter mounting parts 5A and 5B, and directed toward conical recesses 16A and 16B. Small holes 21A and 21B are made in the filter mediums 17A and 17B at a position slightly shifted from the axial center of flow passages 15A and 15B. Accordingly, the oil flowing in the hose is not discharged from the small holes, filtered by the filter medium, and sent out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bidirectional hydraulic hose with a filter for allowing hydraulic fluid to flow in both directions while being filtered in a hydraulic system.

[Conventional technology]

In hydraulic equipment, when circulating through equipment such as pumps and cylinders, and piping, the hydraulic oil becomes contaminated with metal powder and various types of debris. is equipped with a filter.

These filters include tank filters and line filters. A tank filter (strainer) is provided in a hydraulic oil tank installed on the suction side of a hydraulic tank, and is used to filter the hydraulic oil in the tank. Line filters are installed in the middle of piping between pumps and cylinders, and are used to supply clean hydraulic oil to actuators such as cylinders.

This line filter has a structure in which a filter element is housed in a case with piping connected to the oil inlet and the extraction port, and the hydraulic oil passed from the oil inlet into the case is filtered by the filter element and then taken out from the oil outlet. It has become.

(Problems to be Solved by the Invention) Incidentally, installing a line filter requires installation space, and as the device becomes larger, installation becomes difficult if the installation space is limited.

Furthermore, providing a line filter causes the problem of increasing the cost of the device.

In addition, conventionally, the hydraulic hose used as piping to connect the line filter and the actuator has low torsional strength, so if the attached hydraulic hose is lifted or otherwise moved, the reinforcing tension of the hydraulic hose at the connection part may be damaged. be. Therefore, conventionally, when it was necessary to move the hydraulic hose freely, the hydraulic hose was attached to the connecting portion using a siebel joint.

The present invention was proposed in order to solve these conventional problems, and it is possible to downsize the hydraulic system and also to provide a filter-equipped double-sided hose that allows the hose body to be moved freely without using a siebel joint. The purpose is to provide a hydraulic hose.

[Means to solve the problem]

In order to achieve this object, the bidirectional hydraulic hose with filter according to the present invention is provided with a filter housing having conical filter media facing inward attached at both ends of the hose body, and small holes in these filter media at positions offset from the center. It has a configuration with a hole.

Further, a joint is rotatably attached to the periphery of the filter housing via an O-ring.

[Effect]

According to the above-described configuration, the hydraulic oil flowing from one end of the hydraulic hose passes through the small holes in the filter medium at the one end, passes through the hose body, and reaches the filter medium at the other end. Since the filter medium has a small hole at a position offset from the center, the hydraulic oil that reaches the filter medium on the other end side does not escape through the small hole but flows out through the tapered surface of the filter medium. At this time, the hydraulic fluid is filtered.

Further, the hydraulic fluid flowing in from the other end of the hydraulic hose is filtered by the filter medium at the one end and flows out to the outside, similarly to the above-described operation.

Further, since the joint is rotatably fitted around the filter housing, when this joint is connected to a connecting boat of hydraulic equipment, the hose body can be freely moved.

Additionally, an O-ring is fitted between the filter housing and the joint to maintain airtightness.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of a bidirectional hydraulic hose with a filter according to the present invention.

In FIG. 1, the hydraulic hose has joints IA and IB rotatably attached to both ends of the hose, respectively.

For example, the flexible hose main body 2 made of resin has a nipple 4A fixed to one end by a connecting fitting 3A, and a filter attachment part 5A, which will be described later, is fixed to the tip of the nipple 4A. The above joint part IA is
It is rotatably fitted around this filter mounting portion 5A.

Further, a right-angled nipple 4B, for example, is fixed to the other end of the hose main body 2 via a connecting fitting 3B, and the above-mentioned joint part The IB is rotatably fitted.

Note that the joint parts IA and IB are the protruding parts 6A.

6B comes into contact with the rear portions of the filter mounting portions 5A and 5B to prevent removal.

These joint parts IA and IB are the seat plate 7A.

Male screw portions 9A, 9B are formed at the tips of the nut portions 8A, 8B in which the nut portions 7B are integrated, and these male screw portions 9A, 9
B is screwed into the internal thread of the continuous boat of the hydraulic equipment. An O-ring 11A is provided in the recess 10A and IOB formed on the outer periphery between the seat plates 7A and 7B and the male screw portions 9A and 9B.

11B is fitted, so that airtightness can be maintained when the joint parts IA and 1B are respectively tightened to the connecting boat.

The filter mounting portions 5A, 5 which are filter housings
B is a recess 12 formed on the outer periphery as shown in FIG.
O-rings 13A and 13B are fitted into A and 12B, so that the joints IA and IB can be fitted while maintaining airtightness. The retainers 14A and 14B attached to the outer periphery of the filter mounting portions 5A and 5B are as follows:
This is for holding the filter media 17A and 17B.

Further, in the filter mounting portions 5A and 5B, as shown in FIG.
, 16B are formed facing the two directions of the hose body,
These conical recesses 16A and 18B provide mounting parts 5A and 5.
Hydraulic oil flowing in and out of B is guided.

Moreover, conical filter media 17A, 17B made of fine wire mesh or the like are fitted into the inner peripheries of the tips of the filter mounting parts 5A, 5B, facing the conical recesses 16A, 16B. When attaching the filter media 17A, 17B, attach the filter media 17A to the tapered fitting portions 18A, 18B formed on the inner periphery.
, 17B, press-fit the fasteners 19A and 19B. Note that the oil outflow inlets at the tips of the mounting parts 5A and 5B are provided with inwardly directed protrusions 20A.

20B is formed, and the filter medium 17A.

This prevents the 17B from being accidentally removed.

A channel 15A is provided in the filter medium 1 f A, 17B.

A small hole 21A is located at a position slightly offset from the axis that coincides with 15B.
, 21B are drilled.

In the bidirectional hydraulic hose with a filter configured in this way, the hydraulic oil flowing from one end of the hose passes through the filter medium 17A.
It flows into the flow path 15A through the small hole 21A, passes through the flow path 2a of the hose body 2, and reaches the filter medium 17B on the other end side. At this time, there are small holes 2 in the filter medium 17B at positions shifted from the center.
1B is formed, most of the hydraulic oil flows through the small hole 21B.
When it comes out, it hits the filter medium 17B directly and exits through the tapered surface of the filter medium 17B. Therefore, when passing through the filter medium 17B, the hydraulic oil is filtered and sent to the outside of the other end of the hose.

Further, when hydraulic oil flows from the other end of the hose, the hydraulic oil flows into the flow path 15B from the small hole 21B of the filter medium 17B at the other end, passes through the flow path 2a of the hose body 1, and reaches the filter medium 17A. This filter medium 17A is also provided with a small hole 21A at a position offset from the center, so the hydraulic oil flows through the small hole 21A.
It is difficult for the liquid to flow out from the filter medium 17A, and after being filtered by hitting the tapered surface of the filter medium 17A, it flows out to the outside.

Further, in the bidirectional hydraulic hose with a filter, the joint parts IA and IB are rotatably provided at both ends of the hose.

When the IB is connected to a connecting boat for hydraulic equipment, there is an advantage that the hose body 2 can be freely moved.

In addition, O-rings IIA, IIB and 13A, 13B have better resealability than metal seals in the joints IA and IB.
This makes it suitable as a high-pressure hydraulic hose.

Next, a schematic configuration of a hydraulic system in which the bidirectional hydraulic hose with a filter is used will be described with reference to FIG. 4.

In FIG. 4, the hydraulic hose is used as a pipe 25 that connects various actuators 22 and a directional control valve 24 provided on the discharge side of a hydraulic pump 23.

Hydraulic oil tank 2 installed on the suction side of hydraulic pump 23
Hydraulic oil sent out from 6 through the tank filter 27 is supplied to the actuator 22 through the directional control valve 24 and the above-mentioned hydraulic hose.

Hydraulic oil sent out through, for example, a directional control valve within the actuator 22 enters the directional control valve 24 through the bidirectional hydraulic hose and is returned to the hydraulic oil tank 26 through a return pipe 28 .

The hydraulic oil passes through the filter medium 1 when flowing in both directions through the hydraulic hose.
Since it is filtered by 7A and 17B, it is possible to supply the actuator 22 with clean hydraulic oil from which foreign substances have been removed, and also to remove foreign substances from the return oil, so that the filtered hydraulic oil can be returned to the tank 26.

Filter medium 17A is somewhat dirty after use.

17B is removed from the filter mounting portions 5A, 5B and replaced.

In this way, by using the above hydraulic hose, there is no need to install a line filter like in the past, and the hydraulic system can be consolidated.
Can be made smaller.

〔Effect of the invention〕

As explained above, according to the hydraulic hose of claim 1, a conical filter medium with a small hole formed at a position offset from the center is mounted in the filter housing with the filter medium facing inward, and the filter housing is used as a flow path. Since it is connected to both ends of the hose body, the hydraulic oil flowing in both directions through the hose body is filtered by the filter medium on the outlet side and flows out to the outside.

In this way, in the present invention, since the filter is attached to the hose body, there is no need to install a line filter as in the conventional case, and the hydraulic system can be integrated and miniaturized.

According to the hydraulic hose of the second aspect, since the joint is rotatably fitted around the filter housing, the hydraulic hose connected to the connecting boat can be freely moved without using a seal joint.

Further, according to the hydraulic hose of the third aspect, since the O-ring is fitted between the filter housing and the joint, airtightness can be maintained, and the hose is suitable as a high-pressure hydraulic hose.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a bidirectional hydraulic hose with a filter according to an embodiment of the present invention, FIG. 2 is a plan view of a filter mounting part, and FIG. 3(A) is a sectional view taken along the line 1-I in FIG. FIG. 3(B) is a sectional view taken along the line 1--II in FIG. 1, and FIG. 4 is a configuration diagram of the hydraulic system. 1 A, 1 A 3 4 A, 4 5 A, 5 8 A, 8 9 A, 9 11 A. 15A. 16A. 17A. 18A. 2...Hose body B...Joint part B...Connection fitting B...Nipple B...Filter attachment part B...Nut part B...Male thread part 11B, i3A, 13B... 0 ring 15B, 2a・
...Flow path 16B...Conical recess 17B...Filter material 18B...Fitting parts 19A, 19B...Stops 21A, 21B...Small hole 22...Actuator 24...Direction control valve 26... Hydraulic oil tank 23... Hydraulic pump 25... Piping

Claims (3)

[Claims] (1) In a hydraulic hose used in a hydraulic device and in which hydraulic oil flows in both directions, a filter housing with an inlet for the hydraulic oil opening at the tip is provided at both ends of the hose body,
Conical filter media for blocking the inlet and outflow ports are mounted inside the filter housing facing toward the hose body, and through holes are formed in these filter media at positions offset from the flow path of the hose body. Bidirectional hydraulic hose with filter. (2) The bidirectional hydraulic hose with a filter according to claim 1, characterized in that a joint is rotatably fitted around the filter housing. (3) The bidirectional hydraulic hose with a filter according to claim 2, characterized in that an O-ring is fitted between the filter housing and the joint.