JPH0751124Y2 - Element assembly for spin-on filter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter used for filtering a fluid such as oil, and more particularly to a disposable type filter called a so-called spin-on filter.

[0002]

2. Description of the Related Art Conventionally, spin-on filters have been variously used as engine oil filters and the like. This conventional spin-on filter (element assembly)
Is configured by disposing a filter element in a cylindrical case having an open upper end and a closed lower end, and joining a disc-shaped cover member to the case opening. An engine case or the like is attached by a mounting screw formed on the cover member. It is generally removable from the mating member. The replacement is performed not by taking out the filter element but by assembling, so that the filter can be easily replaced.

As described above, since the spin-on filter is a type in which the entire element assembly is replaced, that is, a so-called disposable type, it is necessary to reduce the overall cost. In the conventional case, the case body and the cover member are processed by sheet metal processing. It was made. Furthermore, the cover member is composed of a thick disc substrate and a relatively thin cover plate spot-welded on the substrate, and mounting screws are formed on the substrate.
The outer edge of the cover plate was folded (rolled) together with the upper edge of the case body, and the two were joined.

In the case of the spin-on filter as described above, there is no problem when the pressure of the fluid used is low, as in the case of the engine oil filter. There is a problem that it is not suitable due to the problem of the strength of the mounting screw formed on the plate and the problem of the strength of the joint between the cover plate and the upper edge of the case body. However, there is also a strong demand for using a spin-on filter for filtering a high-pressure working fluid, and for example, a spin-on filter that can be used even under a high pressure of 5 MPa (megapascal) or higher is desired.

Under these circumstances, some spin-on filters (element assemblies) that can be used even under such high pressure have been proposed recently. For example,
JP-B-60-38168 and JP-A-3-1546.
There is a spin-on filter disclosed in Japanese Patent Laid-Open No. 06. In each case, the upper end opening of the substantially cylindrical case body is covered with a thick cover, and a mounting screw is provided on this cover. In this case, in order to increase the pressure resistance of the joint between the case body and the cover, the upper end of the case body may be bent inward (Japanese Patent Publication No. 60-38168).
No.), the upper end of the case body is pressed and deformed radially inward along the stepped portion of the cover, and this portion is covered with a retaining ring (Japanese Patent Laid-Open No. 3-154606).
issue).

[0006]

When the above spin-on filter (element assembly) is used, the tip surface of the upper end of the case body is a cut surface at the time of making the case body and has a rough surface and a square shape. Since the portion (edge portion) is sharp, there is a problem that the hand of the operator may be injured when handling the element assembly. Particularly, in such an element assembly, since the O-ring for sealing the cover insertion portion is provided between the inner surface of the case body and the outer peripheral surface of the case body, the cover is fitted in the upper opening of the case body. When the element assembly is assembled by doing so, there is a problem that the corner portion of the tip end surface of the upper end of the case body may damage the O-ring attached to the outer peripheral surface of the cover.

The present invention has been made in view of these problems.
An object of the present invention is to provide an element assembly for a spin-on filter which is safe in handling the element assembly and which does not damage the O-ring on the outer periphery of the cover when assembling the element.

[0008]

In order to achieve such an object, according to the present invention, an outer peripheral portion of a cover attached to cover an upper end opening of a cylindrical case body is provided with an upper end portion of the case body. A large-diameter cylindrical portion that fits substantially into the opening and can be inserted into the opening, and a small-diameter cylindrical portion that is located above the large-diameter cylindrical portion and has a smaller diameter than the large-diameter cylindrical portion are formed. After the large-diameter cylindrical portion is fitted into the upper-end opening and the cover is inserted, the upper end portion of the case body is press-deformed inward in the radial direction to be joined onto the small-diameter cylindrical portion. Further, the case body is made by cutting the flange portion along the outer peripheral surface of the cylinder from a cylindrical member having a flange portion that spreads outward at a right angle at the upper end, and at least in the state before press deformation, The upper end cut surface faces the outer peripheral side, and the inner surface side of the tip of the upper end portion is formed to be rounded. With this configuration, when the cover is fitted into the upper opening of the case main body, the O
Since the -ring comes into contact with the rounded inner surface at the tip of the upper end of the case body, it is possible to prevent the O-ring from being scratched.

On the outer periphery of the cover, a ring-shaped eave portion which is located above the small-diameter cylindrical portion and covers the small-diameter cylindrical portion from above is formed, and the large-diameter cylindrical portion is fitted into the upper end opening of the case body. After inserting the cover, the upper end of the case body is pressed and deformed inward in the radial direction to join it on the small-diameter cylindrical part, and the tip of the upper end of the case body comes close to the ring-shaped eaves. It is preferably configured so as to be covered by the eaves portion. According to this structure, the ring-shaped eaves cover the tip surface of the upper end of the case body, so that the tip surface of the upper end of the case body is prevented from being injured by a hand when handling the element assembly. You can

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. An overall spin-on filter having an element assembly according to the present invention is shown in FIG.
And an element assembly 3 which is detachably screwed to and attached to the filter head 1. The filter head 1 is fixed to, for example, a hydraulic device, and the element assembly 3 is detached from the filter head 1 and replaced with a new element assembly 3 as needed.

The filter head 1 is made by subjecting a blank product made of cast iron, aluminum casting or the like to predetermined machining. The body 10 of the filter head 1 has an inlet port 11 and an outlet port 13, and a first passage 12 and a second passage 14 communicating with the ports 11 and 13 are formed as shown in the figure. Both passages 12,
Although the walls 14 are separated by a wall 15, a bypass passage 15a is formed in the wall 15 and the bypass passage 15a is formed.
A check valve 18 is provided at a. The check valve 18 normally closes the bypass passage 15a, and the differential pressure ΔP (= P1-P2) between the hydraulic pressure P1 in the first passage 12 and the hydraulic pressure P2 in the second passage 14 is equal to or higher than a predetermined pressure Pa (ΔP>
When it becomes Pa), the bypass passage 15a is opened.

On the lower surface of the body 10 of the filter head 1, there is integrally provided a double-cylindrical connecting portion composed of an outer cylindrical portion 21 and an inner cylindrical portion 23 protruding downward. Therefore, between the inner peripheral surface of the outer cylindrical portion 21 and the outer peripheral surface of the inner cylindrical portion 23, an outer passage 22 (see FIG. 2) having a ring-shaped cross section that extends vertically is formed.
Communicates with the first passage 12 at the upper part and is open at the lower part. A cylindrical inner passage 24 extending vertically is formed in the inner cylindrical portion 23. The inner passage 24 communicates with the second passage 14 at the upper portion and is open at the lower portion.

As shown in the figure, the inner cylindrical portion 23 has a larger amount of protrusion downward than the outer cylindrical portion 21, and the lower end portion 23a of the inner cylindrical portion 23 is further lower than the lower end surface of the outer cylindrical portion 21. It is protruding. A male screw 21 a is formed on the outer peripheral surface of the outer cylindrical portion 21. Furthermore, the outer cylindrical portion 2
A seal surface 10a with which the first seal ring 61 abuts is formed on the lower surface of the body 10 on the outer peripheral side of 1.

On the other hand, as shown in FIG. 4, the element assembly 3 includes an element case 30 and a filter element 50 inserted and held in the element case 30.
Composed of and. The element case 30 is composed of a cylindrical case main body 31 having an upper end 32 opened and a lower end 33 closed, and a cover 35 attached to cover the upper end opening of the case main body 31.

The cover 35 has a through hole 3 which penetrates vertically.
6 is formed on the inner peripheral surface of the through hole 36, and the male screw 21 formed on the outer cylindrical portion 21 of the filter head 1 is formed.
A female screw 36a that is screwed with a is formed. For this reason, the female screw 36a is replaced with the male screw 21a of the outer cylindrical portion 21.
The element assembly 3 can be attached (spun on) to the filter head 1 while being rotated by screwing. A plurality of recesses 37a are provided on the outer peripheral portion of the upper end portion 37 of the cover 35, as shown in FIG. A tool such as a hook spanner 100 can be hooked in the recess 37a, whereby the element assembly 3 is rotated so that the filter head 1 can be easily attached and detached. In addition, the cover 35
A stepped portion 37b is formed on the inner peripheral portion of the upper end portion 37 of the, and the seal ring 61 is placed on the stepped portion 37b.

The outer peripheral surface of the cover 35 has a seal ring groove 3 into which a second seal ring (O-ring) 62 is mounted.
9 and a large diameter cylindrical portion 39, and this large diameter cylindrical portion 39
A small-diameter cylindrical portion 3 located on the upper side of and having a smaller diameter than this
8 and a ring-shaped eave portion 35 which is located above the small-diameter cylindrical portion 38 and is formed in an eave-like shape to cover the small-diameter cylindrical portion 38 from the upper side.
a. As shown in the figure, the case main body 31 receives the large-diameter cylindrical portion 39, and the upper end portion 32 is press-deformed inward and joined to the small-diameter cylindrical portion 38. In this state, the tip surface of the upper end of the case main body 31 has the ring-shaped eaves 3
It is close to 5a and is covered with the ring-shaped eaves 35a.

A method of attaching the case body 31 to the cover 35 as described above will be described. Case body 31
Is formed into a cylindrical shape in which the lower end portion 33 is closed and the upper end portion 32 is opened from the steel plate.
As shown in (A), a constricted portion 31a is formed in the middle, and a flange portion F that spreads outward at the upper end portion 32.
Is formed. And, this flange portion F is the upper end portion 3
2 is cut along the outer peripheral surface P of the cylinder to form a case body 31 as shown in FIG. For this reason, the tip inner surface 32a of the upper end portion 32 of the case body 31 is rounded, and the cut surface of the flange F is located at the tip outer surface 32b.

The case body 31 made in this way
In addition, as shown by an arrow C in FIG.
5 is inserted from the upper side. At this time, the second seal ring 62 is arranged in the seal ring groove 39a of the large-diameter cylindrical portion 39 of the cover 35. However, as described above, the rounded tip inner surface 32a of the case main body 31 is This second
The cover 35 is inserted into the case 31 while contacting the seal ring 62. Therefore, the second seal ring 62
Is not damaged. In this way, as shown in FIG. 6B, the cover 35 has the constricted portion 31 of the case body 31.
It is inserted until it comes into contact with a and the outer peripheral lower end portion 35b of the cover 35.

At this time, the upper end portion 32 of the case body 31 faces the small-diameter cylindrical portion 38 of the cover 35, and the upper end portion 32.
Is pushed inward (in the direction of arrow D) by the roller 100 and is press-deformed. Due to this press deformation, the upper end portion 32 of the case main body 31 is, as shown in FIGS. 1 and 4,
The case body 3 is joined to the small-diameter cylindrical portion 38.
1 and the cover 35 are joined. In the state of being pressed and deformed in this way, the tip surfaces 32a and 32b of the upper end 32 of the case body 31 are covered from above by the ring-shaped eaves 35a. Here, the tip outer surface 32b is a cut surface and is a rough surface.
By being covered with a, it is possible to prevent the hand from being injured by the tip outer surface 32b when the element assembly 3 is handled.

A plurality of guide portions 40 projecting downward are provided at the lower end of the cover 35. A stepped portion 40a is also formed on the inner peripheral portion of each guide portion 40, and the stepped portion 40a is adapted to receive the upper end outer peripheral portion of the filter element 50. Each guide part 4
Between 0, as shown in FIG. 3, a communication space 41 is formed.

The filter element 50 comprises a chrysanthemum-shaped filter medium 54, which is formed by joining the ends of a filter medium bent in a bellows shape and having a chrysanthemum-shaped cross section and a substantially cylindrical outer shape. It is configured to be sandwiched by being sandwiched between the end plates 51 and 52, and the inner peripheral portion is supported by a cylindrical center tube 53. The center tube 53 is made of a punched sheet or the like having a large number of small holes 53a, and the working oil filtered through the filter medium 54 passes through the small holes 53a to form a third space which is an internal space thereof. It is designed to flow into 72.

A compression coil spring 65 is provided at the bottom of the case 30.
And the filter element 50 is pushed upward by the compression coil spring 65. Therefore, the outer peripheral portion of the upper end of the element 50 (the upper end plate 5
1 outer peripheral portion) 51b is received by the stepped portion 40 formed on the inner periphery of the lower end of the cover 35, and in this state, the element 50 is held in the case 30. When held in this way, the upper end plate 51 allows the case 30
The inner space is the first space 7 above the upper end plate 51.
Although it is divided into 0 and the second space 71 outside the element 50, both spaces 70, 71 are communicated by the communication space 41 formed at the lower end of the cover 35.

A communication hole 51a is formed in the central portion of the upper end plate 51 of the element 50, and the communication hole 51a is formed in the cover 35 when the element 50 is held in the case 30 as described above. It faces the through hole 36. Therefore, in the state before the element assembly 3 is attached to the filter head 1 (single state), the third space 72 in the center tube 53 has the communication hole 51.
It communicates with the first space 70 via a. A third seal ring 63 is arranged on the inner peripheral portion of the communication hole 51a.

The above-mentioned element assembly 3 includes the cover 35.
When the female head 36a of the outer cylindrical portion 21 is screwed onto the male head 21a of the outer cylindrical portion 21 and is attached (spin-on) to the filter head 1 while rotating, as shown in FIG. The portion 23a projects into the communication hole 51a of the upper end plate 51. Therefore, the first
The space 70 is partitioned by the inner cylindrical portion 23 so that the third space 7
The third space 72 is separated from the second passage 72 and communicates with the inner passage 24 through the communication hole 51a. At this time, this portion is sealed by the third seal ring 63. At the same time, the first space 70 communicates with the outer passage 22, and this space is sealed by the first seal ring 61 sandwiched between the stepped portion 37b and the seal surface 10a outside the screw coupling portion.

Filtration of hydraulic oil by the spin-on filter configured as described above will be briefly described. The hydraulic oil to be filtered is fed from the inlet port 11 into the first passage 12 as indicated by an arrow IN, and the hydraulic fluid to be filtered is supplied to the outer passage 22.
To flow into the first space 70. Then, after flowing from the first space 70 through the communication space 41 into the second space 71, it is filtered through the filter medium 54 and flows into the third space 72. From the third space 72, the inner passage 24 and the second passage
It is sent out from the exit port 13 through the passage 14 as indicated by an arrow OUT. In this case, when the filter medium 54 is clogged and the hydraulic pressure difference ΔP before and after the filter medium 54 becomes equal to or larger than the predetermined value Pa, the check valve 18 opens the bypass passage 15a.

In the above, the first and second passages (inflow and outflow passages) are provided on the inner diameter side of the attachment screw for attaching (spin-on) the element assembly to the filter head.
Although the filter provided with has been described, the present invention is not limited to this. For example, similar to a filter used conventionally, the first and second passages may be provided separately on the inner diameter side and the outer diameter side of the mounting screw.

[0027]

As described above, according to the present invention,
A large-diameter cylindrical portion that fits approximately into the opening at the upper end of the case body and can be inserted into the outer peripheral portion of the cover attached to cover the upper end opening of the cylindrical case body. A small-diameter cylindrical portion that is located above the large-diameter cylindrical portion and has a smaller diameter than this large-diameter cylindrical portion is formed, and after inserting the cover by fitting the large-diameter cylindrical portion into the upper end opening of the case main body, The upper end is pressed and deformed inward in the radial direction to be joined on the small diameter cylindrical part, and further, the case main body is formed along the outer peripheral surface of the cylinder from the cylindrical member having the flange part which is spread outward at a right angle at the upper end. The flange is made by cutting, and at least before the press deformation, the upper end cutting surface faces the outer peripheral side and the inner surface side of the tip of the upper end is rounded, so the upper end of the case body Fit the cover in the opening When to, O- ring on the cover periphery is only in contact with the rounded inner surface of the case main body upper tip can be prevented scratched the O- ring.

Further, after inserting the cover by fitting the large diameter cylindrical portion into the upper end opening of the case main body, the upper end portion of the case main body is pressed and deformed inward in the radial direction to be bonded onto the small diameter cylindrical portion, It is preferable that the tip of the upper end portion of the case main body thus pressed and deformed is brought close to the ring-shaped eave portion and covered by the ring-shaped eave portion. As a result, the ring-shaped eaves portion covers the tip surface of the upper end portion of the case body, so that it is possible to prevent the tip body surface of the case body from being injured by a hand when the element assembly is handled, and to handle it safely.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a spin-on filter having an element assembly according to the present invention.

FIG. 2 is a cross-sectional view showing the spin-on filter along arrow II-II.

FIG. 3 is a cross-sectional view showing the spin-on filter along arrow III-III.

FIG. 4 is a sectional view showing an element assembly according to the present invention.

FIG. 5 is a cross-sectional view showing a manufacturing process of a case main body which constitutes the element assembly.

FIG. 6 is a cross-sectional view showing a manufacturing process of the element assembly.

[Explanation of symbols]

 1 Filter Head 3 Element Assembly 11 Inlet Port 13 Outlet Port 21 Outer Cylindrical Section 23 Inner Cylindrical Section 30 Element Case 31 Case Body 35 Cover 35a Ring Eave 38 Small Diameter Cylindrical Section 39 Large Diameter Cylindrical Section 50 Filter Element 51, 52 End Plate 54 Filter media 61, 62, 63 Seal ring

Claims (2)

[Scope of utility model registration request] 1. A substantially cylindrical case body having an open upper end and a closed lower end, a filter element inserted into and held in the case body and filtering a fluid flowing through the case body, In the spin-on filter, which comprises a cover attached to the upper end of the case body so as to cover the opening, and which can be attached to and detached from a mating member by a mounting screw formed on the cover, the outer peripheral portion of the cover is A large-diameter cylindrical portion that can be fitted into the opening of the upper end of the case body and can be inserted into this opening,
It has a small-diameter cylindrical portion that is located on the upper side of the large-diameter cylindrical portion and has a smaller diameter than the large-diameter cylindrical portion, and the cover is inserted by fitting the large-diameter cylindrical portion into the upper end opening of the case body. After that, the upper end of the case body is pressed and deformed inward in the radial direction so as to be joined to the small-diameter cylindrical portion, and the case body is widened outward at a right angle at the upper end thereof.
From a cylindrical member with a sharp flange to the outer peripheral surface of the cylinder
It is made by cutting the flange part along with, and at least cutting the upper end before the press deformation.
The surface faces the outer circumference and the inner surface of the top end is rounded.
Spin-on filter for element assembly, characterized in that it has a. 2. The small-diameter cylindrical portion is provided on the outer peripheral portion of the cover.
Is located on the upper side of and covers the small-diameter cylindrical portion from the upper side in an eaves-like shape.
A ring-shaped eave portion is formed, and the large-diameter cylindrical portion is fitted into the upper end opening of the case body.
After inserting the cover, the upper end of the case body
Is pressed inward in the radial direction to contact the small diameter cylindrical portion.
When assembled, the tip of the upper end of the case body
Proximate to the ring-shaped eaves and covered by the ring-shaped eaves
The element assembly for a spin-on filter according to claim 1, wherein the element assembly is for a spin-on filter.