JPH0733845Y2 - Hydraulic filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mounted at the discharge side of a hydraulic pump, etc., and is suitably used for removing foreign matter in high-pressure, high-flow pressure oil. Regarding hydraulic filters.

[Conventional technology]

A conventional hydraulic filter is shown in FIG.

In the figure, reference numeral 1 denotes a casing body, which is formed into a cylindrical body having a bottom and a plurality of screw holes 1A, 1A, ...
Is provided and the inside serves as a filter storage chamber 1B. Reference numeral 2 is an inflow port for pressure oil, which is connected to a discharge side (not shown) of a hydraulic pump, and the high-pressure, high-flow pressure oil discharged from the discharge side flows into the filter housing chamber 1B. It is designed to let you. 3 is an outlet for pressure oil,
Is connected to a supply pipe (not shown) extending to each actuator such as a hydraulic excavator, and the pressure oil that has passed through the filter storage chamber 1B is pressure-fed to each actuator.

Reference numeral 4 denotes a cover that covers the casing body 1.
Is a recess 4A into which one end (upper end in the drawing) of the filter element 7 described later is fitted inside (lower side in the drawing), and the recess 4A is provided so as to communicate with the outside. Has auxiliary ports 4B used for the above, and a plurality of screw insertion holes 4C, 4C ... Which are provided in the peripheral portion of the cover 4 for fixing the cover 4 to the casing body 1.

5, 5 ... are fixing bottles, and each fixing bottle 5 is inserted into each screw insertion hole 4C and screwed into each screw hole 1A of the casing body 1 to fix the cover 4 to the casing body 1. The casing 6 is formed, and the filter chamber 1B and the recess 4A form a filter chamber inside the casing 6.
It comprises 6A.

Reference numeral 7 is a filter element, and the filter element 7 is formed in a cylindrical shape by a wire mesh and is installed in the filter chamber 6A. 8 is an O-ring, and the O-ring 8 is a cover 4
With the lid closed, a seal is formed between the recess 4A of the cover 4 and the upper end of the filter element 7.

Reference numeral 9 is a plug provided on the auxiliary boat 4B of the cover 4, and the plug 9 is removed at the time of pressure measurement or the like. Reference numeral 10 denotes an O-ring that seals between the casing body 1 and the cover 4.

In the hydraulic filter configured as described above, the high-pressure, high-flow pressure oil discharged by the operation of the hydraulic pump flows into the filter chamber 6A from the inflow port 2 and passes through the filter element 7 when the pressure oil flows. The foreign matter inside is filtered out, flows out from the outflow port 3, and is pressure-fed to each external actuator.

[Problems to be solved by the device]

By the way, in the above-mentioned prior art, the filter element 7 is made of a flexible metal mesh as a filtering member, and no reinforcement means is provided on the outer peripheral side.
Therefore, in the portion where the high-pressure, high-flow pressure oil flowing into the filter chamber 6A from the inflow port 2 directly contacts the outer peripheral surface of the filter element 7, the filter element 7 is deformed by the fluid force of the pressure oil, and the short-term There is a problem that it will be damaged soon.

Further, the pressure oil from the inflow port 2 exerts a particularly strong fluid force at a portion corresponding to the inflow port 2, causing irregular clogging, and periodical inspection and cleaning in a short period are required. There is a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and reliably prevents deformation, damage and irregular clogging of the filter element due to the hydraulic force of pressure oil, and securely fixes the outer cylinder, Moreover, it is an object of the present invention to provide a hydraulic filter capable of surely preventing loosening of screws.

[Means for Solving the Problems]

The structure adopted by the present invention to solve the above-mentioned problems is a casing having a filter chamber inside, and a casing that allows a high flow rate of pressure oil to pass through, and a casing mounted in the filter chamber of the casing and passing through the filter chamber. From a filter element that filters foreign matter from the pressure oil and an outer cylinder that is provided so as to surround the outer periphery of the filter element and that has a large number of oil passage holes in the periphery for passing a high flow rate of pressure oil that flows into the filter chamber. A flange portion for supporting one end of the outer cylinder is provided at one end of the filter element, and a screw hole is provided at the other end, and a U-shape is provided at the other end of the outer cylinder at a position corresponding to the screw hole. -Shaped notches are provided, and the outer cylinder is fixedly supported by the flange portion and the screws attached to the screw holes from the U-shaped notches.

[Action]

With the above configuration, the outer cylinder is inserted into the filter element, and one end of the outer cylinder is brought into contact with the flange portion of the element,
The outer cylinder can be fixedly supported on the filter element by the flange portion and the screw simply by mounting the screw in a state where the U-shaped notch at the other end of the outer cylinder is aligned with the screw hole, and flows into the filter chamber. The fluid force of the high flow rate pressure oil is received by the outer cylinder and prevents the filter element from being adversely affected. Moreover, since the screw is fitted in the U-shaped notch, it is possible to prevent loosening of the screw.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Since the overall configuration of the hydraulic filter of this embodiment is almost the same as that of the conventional art, the same members are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 11 is a filter element of the present embodiment, the filter element 11 is a cylindrical portion 12A formed on the inner peripheral side and a disk portion 12B integrally formed by extending outward of the cylindrical portion 12A. A lower restraining plate 12, and an upper restraining plate 13 including a cylindrical portion 13A formed on the inner peripheral side and a disk portion 13B that extends outward of the cylindrical portion 13A and is integrally formed in a thick wall, An inner cylinder 14 which is provided between the restraining plates 12 and 13 on both sides by being fitted into the respective cylinder portions 12A and 13A and which has a large number of oil passage holes 14A, 14A, ...
A filter member 15 is fitted around the inner cylinder 14 so as to be located between the pressing plates 12 and 13 and filters foreign matter in the pressure oil. Then, on the lower holding plate 12, the disc portion
A flange portion 12C is formed around 12B. Further, the disk portion 13B of the upper restraining plate 13 has four screw holes 13C, 13C, ...

16 is an outer cylinder provided around the outer periphery of the filter element 11, and the outer cylinder 16 is formed to be slightly larger than the outer diameter of the filter element 11 and is set so as to have a gap between it and the filter element 11. ing. A large number of oil passage holes 16A for passing pressure oil are provided around the outer cylinder 16, and four U-shaped holes are provided at the upper end at positions corresponding to the screw holes 13C of the upper holding plate 13. A cutout 16B is provided.

Reference numeral 17 denotes a screw which is screwed into the screw hole 13C in a state where each U-shaped notch 16B of the outer cylinder 16 and each screw hole 13C of the upper holding plate 13 are matched, and the outer cylinder 16 is screwed by the screw 17. It is designed to be fixedly supported. The head of each screw 17 is provided with a knurl as a slip stopper.

Although the present embodiment is configured in this way, in order to attach the outer cylinder 16 to the filter element 11, the outer cylinder 16 is inserted into the filter element 11 from the upper side as shown by the alternate long and short dash line in the figure, and the outer cylinder is The U-shaped cutout 16B of the outer cylinder 16 with the lower end of 16 abutting against and being supported by the flange 12C of the lower holding plate 12.
The screw holes 13C of the upper holding plate 13 to match each screw 17
Screw together. In this state, the lower end of the outer cylinder 16 is supported by the flange 12C, and the upper end thereof is supported by the screws 17 fitted in the U-shaped notches 16B, and is integrally fixed to the filter element 11. It

The filter element assembly assembled in this way is
Instead of the filter element 7 described as the prior art,
It is mounted in the filter chamber 6A of the casing 6. In this state, from the inflow port 2 of the casing body 1 to the filter storage chamber 1B
The high-pressure, high-flow pressure oil that has flowed into the valve tries to directly exert its fluid force on the portion of the filter element 11 located in front of the inflow port 2, but the filter element 11 is an outer cylinder.
It is surrounded by 16 and prevents the pressure oil from directly acting on the filter element 11 upon reaching the outer cylinder 16.

As a result, it is possible to reliably prevent the filter element 11 from being deformed or damaged, and it is possible to significantly improve the life of the filter element 11.

Further, since the outer cylinder 16 is supported with respect to the filter element 11 only by the flange portion 12C of the lower holding plate 12 and the screw 17, the outer cylinder 16 can be easily removed, and inspection and cleaning are facilitated. .

Further, the screw 17 is fitted into the U-shaped cutout 16B, and then the screw 17 is fixedly supported to the outer cylinder 16 while being screwed into each screw hole 13C of the upper holding plate 13. Even if there is a gap between the upper restraint plate 13 and the outer cylinder 16, the outer cylinder 16 can be securely fixed and supported, and further, the screw 17 can be securely prevented from being loosened.

However, unlike the present embodiment, the outer cylinder 16 is not provided with the U-shaped notch 16B, but a screw hole is formed in the outer cylinder 16, and the outer cylinder 16 is screwed into each screw hole 13C of the upper holding plate 13. If this is done, a gap due to the tolerance between the outer cylinder 16 and the upper holding plate 13 will inevitably occur,
The outer cylinder 16 cannot be fixed sufficiently and also causes loosening of screws.

In this embodiment, four screw holes 13C, four screws 17 and four U-shaped notches 16B for fixing and supporting the outer cylinder 16 to the filter element 11 are provided.
It suffices that 6 can be securely fixedly supported on the filter element 11, so that the number may be two, three, or five or more in consideration of the sizes of the filter element 11 and the outer cylinder 16.

[Effect of device]

As described in detail above, according to the present invention, an outer cylinder is provided so as to surround the outer periphery of the filter element, a flange portion for supporting one end of the outer cylinder is provided at one end of the filter element, and a screw hole is provided at the other end. Further, a U-shaped notch is provided at a position corresponding to the screw hole at the other end of the outer cylinder to support the outer cylinder with the flange portion and the screw attached to the screw hole, so that the filter chamber of the casing is provided. The inflowing high-pressure and high-flow pressure oil is prevented from directly acting on the filter element by hitting the outer cylinder, and it is possible to reliably prevent the filter element from being deformed or damaged. As a result, the service life of the filter element can be significantly extended, and the reliability of the filter element is improved.

Further, since the outer cylinder can be easily removed only by removing the screw, the filter element can be easily inspected and cleaned.

Further, since the outer cylinder is supported by the screw attached to the screw hole of the filter element while being fitted in the U-shaped notch, there is a gap between the filter element and the outer cylinder at the screw hole portion. Also, the outer cylinder can be securely fixed and supported, and further, the loosening of the screw can be surely prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a filter element and an outer cylinder of the present invention, and FIG. 2 is a partially cutaway side view showing a conventional hydraulic filter. 1 ... Casing body, 2 ... Inlet, 3 ... Outlet,
4 ... Cover, 6 ... Casing, 6A ... Filter chamber,
11 …… Filter element, 12 …… Lower restraint plate, 12C…
… Flange part, 13 …… Upper retaining plate, 13C …… Screw hole, 16
…… Outer cylinder, 16A …… Oil passage hole, 16B …… U-shaped notch, 17…
…screw.

Claims (1)

[Scope of utility model registration request] 1. A casing having a filter chamber therein, which allows a high flow rate of pressure oil to pass therethrough, and a filter element mounted in the filter chamber of the casing for filtering foreign matter from the pressure oil passing through the filter chamber. An outer cylinder is provided surrounding the outer periphery of the filter element, and has an outer cylinder having a large number of oil passage holes around it for passing a high flow rate of pressure oil flowing into the filter chamber. A flange portion for supporting one end of the cylinder is provided, a screw hole is provided at the other end, and a U-shaped notch is provided at a position corresponding to the screw hole at the other end of the outer cylinder, and the outer cylinder is A hydraulic filter that is fixed and supported by a flange and a screw that is attached to a screw hole from a U-shaped notch.