JP2016089915A - Hydraulic filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach/detach an element 1 having a filter member in a single operation.SOLUTION: In a hydraulic filer 1, an element 3 having a filter member 13 for filtering oil is fitted in a housing 2 having an inlet 2a and an outlet 2b of working fluid. In the housing 2, an adapter 9 is fixed to a housing body 7 by means of screwing or the like, and a recess 11 is formed on an outer peripheral surface of the adapter 9. A recessed part 14 to which the adapter 9 is fitted and an outer peripheral part 16 thereof are respectively formed on the element 3. A lock ring 4 can advance and retreat along an outer peripheral surface of the element 3, and a tilt hole for storing a steel ball 18 so as to advance and retreat is provided in the outer peripheral part 16. The lock ring 4 pushes the steel ball 18 in the tilt hole and the recess 11 with a protrusion 4a at an advancing position so that the element 3 is attached and fixed to the housing 2, and removes the steel ball 18 from the recess 11 with the tilt hole at a retreating position so that the element 3 is detached.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hydraulic filter that filters impurities such as dust contained in oil used in hydraulic equipment and the like.

  Conventionally, an in-line filter as a hydraulic filter used in hydraulic equipment or the like includes an element including a filter member for removing impurities such as oil dust, and a hydraulic flow path having an oil inlet and an outlet. And a housing that filters oil impurities with the filter member. In-line filters require regular maintenance work such as element cleaning and filter member replacement.

As such an inline filter, for example, a filter described in Patent Document 1 has been proposed.
In this inline filter, a filter member is mounted in a cylindrical housing, its bottom is bolted to the bottom of the housing, and an opening facing the bottom of the filter member is fitted to a lid member mounted on the opening of the housing. . The filter member and the lid member constitute an element. A plurality of oil inlet passages are formed along the circumferential direction of the side surface of the housing, and an annular passage through which oil before filtration flows from the inlet passage is formed between the filter member and the side surface of the housing. Yes. Then, the oil filtered through the filter member is discharged from the opening of the filter member through an outlet passage formed in the lid member and reused. The lid member is fixed to the housing by a bolt.

  Also, in other forms of inline type hydraulic filters, flanges are provided on the lid member to which the filter member of the element is attached and the housing for housing the filter member, respectively, and both flanges are fixed by connecting them with bolts and nuts. It has a configuration to do.

JP 2000-205208 A

  By the way, when cleaning the in-line filter or the hydraulic filter as described above or replacing the filter member, it is necessary to remove the bolts fixed to the lid member or the flange. In particular, in the inline filter described in Patent Document 1, in order to further remove the filter member, the bolt at the bottom of the housing has to be removed. Even after cleaning or after replacement of the filter member, it is necessary to fasten the plurality of bolts removed earlier to fix the lid and filter member to the housing, and the removal and assembly operations are complicated and troublesome. .

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a hydraulic filter in which an element including a filter member can be easily attached and detached.

A hydraulic filter according to the present invention includes a housing having an inlet and an outlet of a hydraulic flow path and having a first attachment / detachment portion, a filter member that is stored in the hydraulic flow passage in the housing and filters oil, and the first attachment / detachment portion And an element having a second detachable part that can be attached and detached, and the first detachable part and the second detachable part are attached by pushing the element into the housing, and the first detachable part is drawn by pulling the element out of the housing. The second attaching / detaching portion is detached.
According to the present invention, when removing the hydraulic filter, the first attachment / detachment portion of the housing and the second attachment / detachment portion of the element are separated by pulling out the cover portion of the element. Can be easily pulled out of the housing. Also, when the element is mounted on the housing, the element can be fixed to the housing by fitting the first attachment / detachment portion and the second attachment / detachment portion by pushing the element into the housing.

Further, a taper portion that guides the insertion of the element may be provided at the insertion port of the housing.
Since the insertion portion of the housing is provided with a taper portion, the insertion of the element is guided, thereby facilitating the insertion of the element.

Moreover, the 1st attachment / detachment part of a housing may be provided in the adapter with which the housing main body was mounted | worn, and the adapter may be fixed to the housing main body with the external thread and the internal thread.
The adapter provided with the first attaching / detaching portion is screwed and fixed to the housing main body to constitute the housing, so that the adapter can be attached to an existing housing not provided with the adapter. And this invention is applicable to the housing of the existing hydraulic filter by mounting | wearing the element which provided the 2nd mounting part.

The first attaching / detaching part is a recessed part provided in the housing, and the second attaching / detaching part is provided with a steel ball capable of advancing and retracting in the element and an advancing position along the outer peripheral surface of the element. It is preferable to include a lock ring that presses the steel ball into the recessed portion and does not press the steel ball in the retracted position, and an elastic member that biases the lock ring to the advanced position.
According to the present invention, when the element is pushed into the housing and the lock ring of the element is advanced in the housing direction, the steel ball of the element is pushed and falls into the recessed portion of the housing, and the lock ring causes the steel ball to enter the recessed portion by the elastic member. The state of pressing is held. As a result, the housing and the element are fixedly held together by fitting a part of the steel ball into the recessed portion in a fitted state.
In order to pull out the element from the housing, the lock ring of the element is slid to the retracted position to move the steel ball to a position where the steel ball is not pressed, and the steel ball is pushed by the side wall of the recess by pulling out the element from the housing. Thus, the element returns from the recessed portion into the element and can be removed from the fixed state with respect to the housing. Therefore, the element can be easily attached to and detached from the housing with one touch by inserting and removing the lock ring and the element.

  The hydraulic filter according to the present invention can be engaged with the mounting state by pushing the second mounting / demounting portion of the element into the first mounting / demounting portion of the housing when mounting, and pulls out the lid portion of the element from the housing when separating. Thus, since the first attaching / detaching portion and the second attaching / detaching portion can be detached, the element and the housing can be easily attached / detached without using a bolt or the like, and the operation is easy.

1 is a front view of a hydraulic filter according to an embodiment of the present invention. It is a top view of the hydraulic filter shown in FIG. FIG. 3 is a central longitudinal sectional view taken along the line AA, showing a mounting state of the hydraulic filter shown in FIG. 2. FIG. 4 is a central cross-sectional view similar to FIG. FIG. 3 is a partial vertical cross-sectional view taken along the line BB showing a mounting state of the hydraulic filter shown in FIG. 2.

Hereinafter, a hydraulic filter 1 according to an embodiment of the present invention will be described with reference to FIGS.
The hydraulic filter 1 shown in FIGS. 1 and 2 is one in which an element 3 is fitted and fixed to a housing 2. The housing 2 has a dirty hydraulic oil inlet 2a containing impurities such as dust on one side surface, and an outlet 2b for discharging clean hydraulic oil filtered in the housing 2 on the opposite side surface. Is formed. An annular lock ring 4 is provided on the outer peripheral surface of the element 3 so as to be slidable in the direction of the central axis O of the hydraulic filter 1.

  In the hydraulic filter 1 according to the present embodiment, the element 3 can be detached and pulled out from the housing 2 by pulling the lock ring 4 upward, and the element 3 can be attached and fixed to the housing 2 by pushing downward. A separator plug 5 is attached to the center of the top portion 3a of the element 3, and an indicator for detecting clogging can be attached in place of the separator plug 5 to notify the replacement timing of the filter member 13 described later.

  In the longitudinal sectional view of the hydraulic filter 1 shown in FIGS. 3 and 4, the housing 2 has a substantially bottomed cylindrical shape, and the inner surface 2c of the housing 2 is formed in a substantially cylindrical shape. A stepped portion is formed on the inner peripheral surface of the ring-shaped upper end portion 7a of the housing body 7 in the housing 2 as shown in the enlarged view of FIG. 5, and a female screw is formed on the inner wall surface of the stepped portion. Part 7b is formed. Further, for example, a male screw portion 9a of a ring-shaped adapter 9 having a substantially L-shaped cross section is screwed into the female screw portion 7b. The housing 2 is constituted by the housing body 7 and the adapter 9.

The adapter 9 is a separate component from the housing body 7 and can be mounted integrally by being screwed into the female thread 7b on the inner wall surface of the stepped portion of the upper end 7a of the housing 2. A concave portion 11 is formed on the outer peripheral surface of the adapter 9. A plurality of the recessed portions 11 are preferably arranged on the outer peripheral surface of the adapter 9 at a predetermined interval, for example, at equal intervals. A tapered portion 9b is formed on the inner surface of the adapter 9 over the entire circumference so that the element 3 can be easily inserted. The inner peripheral surface of the adapter 9 of the housing 2 constitutes an insertion port for the element 3.
In FIG. 5, a positioning hole 10 for positioning when the element 3 is mounted on the outer peripheral side of the adapter 9 is formed on the upper surface of the upper end portion 7 a.

In the element 3, a socket body 12 is formed inside the lock ring 4, and a filter member 13 having a bottom and a substantially cylindrical shape is attached to a lower end portion thereof. In addition, a recess 14 is formed in a ring shape in the lower part on the outer peripheral side of the socket body 12 so as to fit the ring-shaped adapter 9 when fitted. Is equipped with a liquid-tight O-ring 15.
In addition, a substantially cylindrical outer peripheral portion 16 formed on the outer peripheral side of the concave portion 14 is formed with a substantially truncated cone-shaped inclined hole 17 penetrating the inner and outer surfaces in the horizontal direction. A steel ball 18 that can be partially inserted into the recessed portion 11 is provided. The inclined hole 17 that accommodates the steel ball 18 has an inner small-diameter hole smaller than the outer diameter of the steel ball 18, so that the steel ball 18 does not protrude inside and fall into the recessed portion 11 as a whole.

In addition, a groove portion 19 is formed in the upper and lower portions of the steel ball 18 on the outer peripheral surface of the socket main body 12 between the lock ring 4 and a coil-shaped pressing spring 20 disposed as an elastic member in the groove portion 19. It is installed.
Further, a stop ring 22 that prevents the lock ring 4 from moving downward is disposed below the steel ball 18. Further, a trapezoidal protrusion 4 a that can press the steel ball 18 is formed on the inner surface of the lock ring 4 so as to protrude toward the outer peripheral portion 16. When the pressing spring 20 presses the protrusion 4a, the lock ring 4 is urged in the direction of the housing 2, and the lock ring 4 is in the advanced position, which will be described later, and the stop ring 22 prevents further downward movement in the direction of the housing 2. The

Therefore, in the advance position where the lock ring 4 slides downward on the outer peripheral surface of the element 3, the protrusion 4 a is pushed by the urging force of the pressing spring 20 to push the steel ball 18 into the inclined hole 17 and a part thereof is recessed. In contact with the back surface of the steel ball 18 in a state of entering the portion 11. Moreover, the tip surface of the protrusion 4a of the lock ring 4 abuts against the stop ring 22 and further downward movement is prevented. In this state, the element 3 is locked to the housing 2 via the steel ball 18.
In the retracted position where the lock ring 4 slides upward on the outer peripheral surface of the element 3, the protrusion 4 a is positioned above the steel ball 18 to compress the pressing spring 20, and below the protrusion 4 a of the lock ring 4. The side portion 4 b is positioned on the back surface of the steel ball 18 to hold the steel ball 18 in the inclined hole 17. In this state, the element 3 is not locked to the housing 2, and the element 3 can be taken out. In addition to the O-ring 15, a plurality of O-rings for liquid tightness are disposed between the housing 2 and the element 3.

In the present embodiment, the recessed portion 11 of the adapter 9 is used as a first attaching / detaching portion, and at least the inclined hole 17, the steel ball 18, the pressing spring 20, and the protrusion 4 a of the lock ring 4 in the socket body 12 of the element 3 are used as the second attaching / detaching portion. And A plurality of sets of the second mounting portions are installed at positions facing each other according to the arrangement in the circumferential direction of the plurality of recessed portions 11 that are the first mounting portions.
Further, in the element 3, as shown in FIG. 5, a positioning pin 24 is attached to the lower end portion of the inclined hole 17 of the outer peripheral portion 16 so as to be advanced and retracted by a spring, and is provided at the upper end portion of the housing body 7. By fitting into the positioning hole 10, the circumferential position of the element 3 and the housing 2 can be positioned. In this state, the first attaching / detaching portion and the second attaching / detaching portion described above are in positions facing each other and can be fitted to each other.

The hydraulic filter 1 according to the present embodiment has the above-described configuration. Next, a method for attaching and detaching the hydraulic filter 1 will be described. In a state in which the element 3 is mounted on the housing 2 of the hydraulic filter 1, the steel ball 18 in the inclined hole 17 of the element 3 is partially in the recessed portion 11 of the adapter 9 of the housing 2 as shown in FIGS. 3 and 5. The steel ball 18 comes into contact with the protrusion 4 a of the lock ring 4 pressed by the pressing spring 20 and is held in engagement with the inclined hole 17 and the recessed portion 11.
In this state, the hydraulic oil flowing from the inlet 2 a of the housing 2 flows into the filter member 13 from the annular space between the inner peripheral surface of the housing 2 and the filter member 13. Impurities such as dust of hydraulic oil are filtered and captured by the filter member 13, and the cleaned hydraulic oil is discharged from the outlet 2b and reused. The hydraulic oil flow path from the inlet 2a to the outlet 2b through the filter member 13 constitutes a hydraulic flow path.

Then, the element 3 is removed when the filter member 13 having a reduced filtration capacity due to impurities attached or when the element 3 needs to be cleaned. That is, in FIG. 4, the lock ring 4 of the element 3 is slid upward against the urging force of the pressing spring 20. Then, the protrusion 4 a of the lock ring 4 is disengaged from the steel ball 18, and the pressing spring 20 is compressed in the groove 19.
When the element 3 is pulled out from the housing 2, the steel ball 18 of the element 3 is pushed by the inclined surface of the recessed portion 11 of the adapter 9 and retracted into the inclined hole 17 from the recessed portion 11. As a result, the steel ball 18 and the adapter 9 are disengaged, so that the element 3 can be separated from the housing 2.

  Then, the housing 2 and the element 3 can be cleaned and the filter member 13 attached to the element 3 can be replaced. Moreover, when the element 3 is pulled out, the operator's hand is not soiled with oil or the like.

  Thereafter, in order to mount the element 3 with the replaced filter member 13 in the housing 2, the positioning pin 24 of the element 3 is positioned facing the positioning hole 10 formed in the housing 2, and the element 3 is inserted into the insertion port of the adapter 9. The taper portion 9 b is guided and inserted into the housing 2. After that, by pushing the lock ring 4 toward the housing 2, the steel ball 18 is pushed by the tapered surface of the protrusion 4 a to drop a part into the recessed portion 11 in the adapter 9, and the protrusion 4 a is placed on the back surface of the steel ball 18. Make contact. In this state, the upper side of the protrusion 4 a is pushed by the urging force of the pressing spring 20, and the lower side of the lock ring 4 is stopped by the stop ring 22. Moreover, as shown in FIGS. 3 and 5, the protrusion 4 a comes into contact with the back surface of the steel ball 18 partially falling into the recessed portion 11, and the element 3 is fixed to the housing 2 in a fitted state, and is attached. Complete.

As described above, according to the hydraulic filter 1 according to this embodiment, the element 3 can be attached to and detached from the housing 2 by sliding the lock ring 4 up and down and pushing in or pulling out the element 3 with one touch. The element 3 can be attached and detached. Moreover, since the tapered portion 9b is formed on the upper portion of the adapter 9 of the element 3, it can be easily attached and detached by guiding insertion / removal.
Further, the adapter 9 in the housing 2 is a separate part from the housing main body 7, and if the female screw 7 b is formed on the inner peripheral surface of the housing main body 7, the element 3 having the second attaching / detaching portion is also provided in the ready-made housing 2. Since it can be mounted by touch, the present invention can be applied not only to new products but also to ready-made hydraulic filters 1.

  The hydraulic filter 1 according to the present invention is not limited to the above-described embodiment, and various modifications and replacements can be made without departing from the gist thereof, and any of these is included in the present invention. Although the modification of this invention is demonstrated below, the same code | symbol shall be used for the component and member which are the same as that of the component and member of the hydraulic filter 1 mentioned above, or similar.

For example, the first attachment / detachment portion and the second attachment / detachment portion of the hydraulic filter 1 are switched between engagement and disengagement between the recessed portion 11 and the steel ball 18 in the inclined hole 17. The configuration is not limited. For example, instead of the steel ball 18, a configuration in which the engaging convex portion and the engaging concave portion are detachably attached may be adopted, and other appropriate engaging / disengaging structures may be used for the first attaching portion and the second attaching portion. Can be adopted.
Further, in the embodiment described above, the hydraulic filter 1 according to the present invention can be applied to the existing housing 2 by screwing the male screw 9a provided on the adapter 9 with the female screw 7b provided on the housing body 7 and integrating them. However, the housing 2 in which the adapter 9 is formed integrally with the housing body 7 in advance may be used. Further, in the above-described embodiment, a male screw and a female screw may be formed on either the housing main body 7 or the adapter 9 of the hydraulic filter 1.

  Further, the positioning hole 10 and the positioning pin 24 can be installed at appropriate positions as long as they are the contact surfaces of the housing 2 and the element 3. The positioning holes 10 and the positioning pins 24 are provided on any contact surface of the housing 2 and the element 3. May be.

DESCRIPTION OF SYMBOLS 1 Hydraulic filter 2 Housing 3 Element 4 Lock ring 4a Protrusion part 7 Housing main body 7b Female thread part 9 Adapter 9a Male thread part 9b Tapered part 11 Recessed part 13 Filter member 17 Inclined hole 18 Steel ball 20 Pressing spring 22 Stop ring

Claims (4)

A housing having an inlet and an outlet of the hydraulic flow path and having a first detachable portion;
A filter member that is stored in a hydraulic flow path in the housing and filters oil, and an element that is provided with a second detachable portion that can be attached to and detached from the first detachable portion,
A hydraulic filter, wherein the first detachable portion and the second detachable portion are attached by pushing the element into the housing, and the first detachable portion and the second detachable portion are separated by pulling out the element from the housing.   The hydraulic filter according to claim 1, wherein a taper portion that guides insertion of the element is provided at an insertion port of the housing.   The hydraulic filter according to claim 1 or 2, wherein the first attaching / detaching portion of the housing is provided in an adapter attached to the housing main body, and the adapter is fixed to the housing main body with a male screw and a female screw. The first attaching / detaching portion is a recessed portion provided in the housing,
The second attaching / detaching portion is provided in the element so as to be able to advance and retract, and is provided so as to be able to advance and retract along the outer peripheral surface of the element, and presses the steel ball into the recessed portion at the advanced position and at the retracted position. The hydraulic filter according to any one of claims 1 to 3, further comprising: a lock ring that does not press the steel ball; and an elastic member that biases the lock ring toward the advanced position.

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