JP3307142B2 - Filter assembly with cylindrical mesh - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical frame member having an oil passage hole on a side surface, and a cylindrical filter element housed in the cylindrical frame member and covering the oil passage hole. And a filter assembly comprising:

[0002]

2. Description of the Related Art A filter assembly having a structure in which a cylindrical filter element is housed in a cylindrical frame member having an oil passage hole on a side surface is widely used, and its shape and dimensions are various. A large and large-capacity device has a complicated structure and a large number of components. However, a small one generally has a simple structure. For example, a small one in which a filter element made of a wire mesh is incorporated in a cylindrical holder is often used. In this case, the cylindrical holder has an outer shape like a frame supporting a wire mesh because an oil hole is provided on a side surface thereof. FIG. 4 is an external perspective view illustrating one of the simplest and small-sized conventional filter assemblies. The reference numeral 2 denotes a cylindrical net functioning as a filter element, which is housed in a cylindrical frame 1 as a holder. The cylindrical frame has a frame shape as a result of drilling an oil passage hole in a side surface of a cylinder with no top. This type of filter assembly is used upside down as compared to the position shown in the figure, and is also used in a position where it is laid down or inclined, so there is no distinction between top and bottom and left and right. For convenience of description, the posture depicted in the accompanying drawings is referred to as upper, lower, and top and bottom. The filter assembly having the structure as shown in FIG. 4 is constructed by combining the cylindrical frame 1 and the cylindrical net 2 separately from each other and combining them. Changes. Conventional examples of the material and processing method of the cylindrical frame 1 include a metal press-molded product, a metal die-cast processed product, and a synthetic resin injection-molded product. (Abbreviation M
IM). Metal injection molding is a recent technology that can be said to be a developing technology at present, and the market size has increased about three times in the last three years. Among these, metal injection
The name mold is finally taking root. This metal injection mold is a fusion of the metallurgy technology for sintered alloys and the injection molding technology developed for synthetic resins. It is made of a plastic material, pressed into a mold, molded, and then subjected to sintering by removing the binder, which is suitable for mass production of small and complicated-shaped members. However,
One of the drawbacks of this metal injection mold as compared with die casting or synthetic resin molding is that a relatively large shrinkage of 15 to 18% is produced during sintering. For this reason, it is extremely difficult to apply the insert molding technology relating to die casting or synthetic resin injection molding. Therefore, when the tubular frame 1 of the filter assembly shown in FIG. 4 is formed by metal injection molding, the tubular mesh 2 cannot be insert-molded, and the tubular frame 1 and the tubular mesh 2 are separately formed. After the construction, a method of inserting the tubular net 2 into the tubular frame 1 has to be adopted.

[0003]

When the filter assembly illustrated in FIG. 4 is manufactured, since the insert molding technique cannot be applied to the case where the cylindrical frame 1 is press-molded and the case where the metal injection molding is performed, the cylindrical frame 1 is not formed. An operation of inserting the tubular net 2 into the frame 1 is required. Since press molding is suitable for mass production of simple shapes, the cylindrical frame 1 shown in FIG. 4 is divided into an upper half U and a lower half D and manufactured. The work of assembling the lower half D by putting the tubular net 2 in the inside is performed rationally, and for example, a method of forming a hook (not shown) and hanging it on can be used arbitrarily. .

[0004] However, the metal injection mold has an advantage in that a member having a complicated shape can be formed by itself, so that the cylindrical frame 1 may be divided into an upper half U and a lower half D. The advantages of metal injection molding are not available. FIG. 5 is an exploded projection view depicting a cylindrical frame formed by metal injection, a cylindrical net housed in the cylindrical frame, and a C-ring for fastening the housed cylindrical net, (A) is a longitudinal sectional view of a tubular frame, (B) is an external side view of a tubular mesh, and (C) is a sectional view of a C-ring. As shown in FIG. 5 (A), the cylindrical frame 1 has a top and bottomless cylindrical body as a basic shape, and an oil passage hole 1a is provided on a side surface thereof to form a frame. Oil hole 1
A ring groove 1b is formed to be spaced downward from a.
The cylindrical net 2 is obtained by rolling a rectangular metal net and plastic forming it into a cylindrical shape. The C ring 3 is a member formed by annularly forming a spring steel wire, but has a C-shape with a gap 3a provided at a joint portion. FIG. 6 is a longitudinal sectional view illustrating a conventional filter assembly constructed by combining the components of the exploded view shown in FIG. 5 described above. A cylindrical net is inserted from the opening at the lower end of the cylindrical frame 1 to abut the ceiling surface 1c,
Compress the C-ring 3 and insert it into the lower end of the tubular net 2;
The cylindrical net 2 is fitted into the ring groove 1b.

As can be easily understood from FIG. 6, the upper end of the tubular net 2 in this conventional example is inserted only near the top of the tubular frame 1 and the supporting state is unstable.

[0006] These problems occur because the cylindrical frame 1 is made of metal injection molding. Because, when the cylindrical frame is a die-cast product or a synthetic resin injection-molded product, the cylindrical net 2 can be securely held by applying the insert molding technique. Further, in the case of a press-formed product, the tubular frame 2 can be incorporated by dividing the tubular frame, and it is easy to fix the tubular mesh by combined use of caulking. As described above, in the prior art, as a problem peculiar to the metal injection mold filter assembly, the cylindrical frame 1
There is a problem that a gap is easily formed due to instability or instability between the filter and the cylindrical net 2 and unfiltered oil leaks to deteriorate filter performance. Further, (see FIG. 6), there is also a problem that the upper end of the tubular net 2 is frayed because the net material is kept cut. If the end of the net is frayed, it will not function as a filter net and will allow foreign matter to pass through. Although a technique of performing soldering to prevent the fraying is known, the manufacturing cost increases due to the fraying prevention processing. The present invention has been made in view of the above circumstances, there is no risk of causing leakage of unfiltered oil, there is no risk of fraying the tubular net, and without requiring special skills An object of the present invention is to provide a filter assembly that can be assembled quickly and easily.

[0007]

In order to achieve the above objects (leakage, fraying prevention and easy assembly), a filter assembly according to the present invention comprises a cylinder having a bottomless bottomed cylinder having an oil passage hole formed in a side wall thereof. A filter element comprising a tubular frame member and a tubular mesh housed in the tubular frame member and covering the oil passage hole, wherein the inner diameter of the tubular mesh is A screen holding plate having an outer diameter substantially equal to that of the screen holding plate is provided, and a hole is formed in a center portion of the screen holding plate, and the screen holding plate is provided on a lower surface of a top wall of the cylindrical frame member having no top. A column-shaped projection that fits tightly with the hole of the plate is formed, and the upper end of the cylindrical mesh is sandwiched between the inner peripheral surface of the cylindrical frame member and the outer peripheral surface of the mesh holding plate. At the same time, the column-shaped projections are pressed into the holes of the mesh holding plate, so that the mesh holding plate is Characterized in that it is fixed in frame. However, drilling in the present invention does not necessarily mean that the hole is drilled by machining, but indicates that the resulting shape has holes.

[0008]

According to the above means, the upper end of the cylindrical mesh is sandwiched between the inner peripheral surface of the cylindrical frame member and the outer peripheral surface of the mesh holding plate. It is pressed against and adhered to the inner peripheral surface of the cylindrical frame member. Therefore, there is no fear that unfiltered oil leaks from the gap between the upper end of the tubular mesh and the tubular frame member. Further, since the upper end of the tubular mesh is sandwiched between the tubular frame member and the mesh holding plate as described above, there is no danger of fraying at the upper end of the tubular mesh, and the durability is improved. Is excellent. Further, since the columnar projection on the lower surface of the cylindrical frame top wall is press-fitted and fixed to the center hole of the mesh holding plate, the mesh holding plate can be quickly and easily attached to the cylindrical frame top wall. Fixed. That is, it is not necessary to perform a troublesome operation such as tightening by turning a set screw, plastic working of a tongue piece, or use of an adhesive, and the mesh holding plate is attached to the lower surface of the top wall of the cylindrical frame member ( By a simple operation of strongly pressing against the ceiling surface), it is possible to assemble and fix quickly and easily without requiring any special skills or a great deal of labor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to FIGS.
An embodiment of the present invention will be described. FIG. 2 is an exploded view of one embodiment of a filter assembly comprising a tubular frame and a tubular net according to the present invention, which also serves as an assembling work process diagram, (A) is a longitudinal sectional view of the tubular frame, (B) is an external side view of the tubular net, and (C) is a cross-sectional side view of a net holding member made of a press-formed spring steel plate. This embodiment is an improvement obtained by applying the present invention to the conventional example shown in FIG. The difference between FIG. 2, which is an embodiment of the present invention, and FIG. 5, which is a conventional example, that is, matters to which the present invention is applied will be described. The reference numeral 5 denotes a mesh holding plate according to the present invention, which has a shape and dimensions that can be inserted into the cylindrical frame 4. Details of the dimensions will be described later with reference to FIG. The mesh holding plate 5 of this example is formed by press-forming a spring steel plate, and has a press-fit hole 5b formed at the center. This name is because the columnar projection is pressed in as described below,
It is a shortened term of "hole for press-fitting protrusions". The cylindrical frame 4 is
A member corresponding to the cylindrical frame 1 in the conventional example (FIG. 5), and a column-shaped press-fit projection 4e is integrally formed at the lower center of the top wall. The outer diameter of the press-fitting projection 4e is set so as to fit into the press-fitting hole 5b of the mesh holding plate 5 with an interference. Further, in this embodiment,
When the mesh holding plate is press-formed to form the press-fit hole 5b, a claw 5a is cut and raised around the press-fit hole 5b so as to elastically hold the press-fit. Such a cut and raised nail 5
When a is provided, press-fitting of the press-fitting projection 4e is facilitated, and
Performs a retaining action by the biting effect. 3A and 3B are drawings in which a cylindrical frame is extracted from the constituent members shown in FIG. 2 described above, and FIG. 3A is an external perspective view, FIG. 3B is a longitudinal sectional view, and FIG. ) Is a sectional view taken along the line CC. (Refer to FIG. 2) The cylindrical net 2 is inserted into the cylindrical frame 4 as shown by an arrow a and abuts against the ceiling surface 4c, and the mesh holding plate 5 is passed through the cylindrical net 2 as shown by the arrow b. And push it against the ceiling surface 4c,
The press-fitting protrusion 4e is press-fitted into the press-fitting hole 5b of the mesh holding plate 5. FIG. 1 is a longitudinal sectional view showing an assembled state of a filter assembly having a cylindrical mesh according to an embodiment of the present invention, and a cylindrical frame for clarifying the vicinity of the leading end of a lead wire of a mesh holding plate. A part of the top surface is cut away and drawn. The press-fitting protrusion 4e is press-fitted into the press-fitting hole 5b, and the tip of the cut-and-raised claw 5a is pressed against the press-fitting protrusion 4e by an elastic force, thereby performing a retaining action by a biting action.

In the assembled state shown in FIG. 1, the upper end of the tubular mesh 2 is securely held between the outer peripheral surface of the mesh holding plate and the inner peripheral surface of the cylindrical frame 4. Because there is Since the outer periphery of the upper end portion of the tubular net 2 is in close contact with the upper end portion of the inner periphery of the tubular frame 4 to form no gap, there is no fear that unfiltered oil leaks. There is no danger of fraying even if the edge of the upper end of the tubular net 2 is not subjected to a separate fraying prevention process, and the press-fitting is performed by simply pressing the net holding plate 5 against the top wall of the tubular frame 4. The projection 4e and the press-fit hole 5b are naturally aligned, and when further pressed, they are press-fitted and fixed. Like turning a screw,
Since it does not involve the operation of bending and caulking the nail pieces,
The tubular net 2 can be quickly and easily assembled without any special skill. Thus, being able to assemble by a simple operation means that this assembling work is suitable for automation. For example, when applied to industrial products that are expected to be mass-produced, such as oil filters made of metal injection molds, the possibility of automatic assembly is a great advantage for reducing manufacturing costs, and is in the process of development. There is a great deal of contribution to the improvement of metal injection related technology, the promotion of practical application, and the expansion of applications.

[0011]

According to the present invention, since the upper end of the cylindrical mesh is sandwiched between the inner peripheral surface of the cylindrical frame member and the outer peripheral surface of the mesh holding plate, the upper end of the cylindrical mesh is formed. The part is pressed against the inner peripheral surface of the cylindrical frame member and is brought into close contact therewith. Therefore, there is no fear that unfiltered oil leaks from the gap between the upper end of the tubular mesh and the tubular frame member. Furthermore, since the upper end of the tubular mesh is sandwiched between the tubular frame member and the mesh holding plate as described above,
There is no danger of fraying at the upper end of the cylindrical net, and the durability is excellent. Further, since the columnar projection on the lower surface of the cylindrical frame top wall is press-fitted and fixed to the center hole of the mesh holding plate, the mesh holding plate can be quickly and easily attached to the cylindrical frame top wall. Fixed. That is, it is not necessary to perform a troublesome operation such as tightening by turning a set screw, plastic working of a tongue piece, or use of an adhesive, and the mesh holding plate is attached to the lower surface of the top wall of the cylindrical frame member ( The simple operation of pressing firmly onto the ceiling surface) has the excellent practical effect of being able to quickly and easily assemble and fix without the need for special skills and a great deal of labor. There are many places that contribute to the development of

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an assembled state of a filter assembly having a cylindrical mesh according to an embodiment of the present invention, wherein the cylindrical shape is used to clarify the vicinity of the leading end of a lead wire of a mesh holding plate. A part of the top surface of the frame is broken and drawn.

FIG. 2 is an exploded view of one embodiment of a filter assembly comprising a tubular frame and a tubular net according to the present invention, which also serves as an assembly work process diagram, wherein (A) is a longitudinal sectional view of the tubular frame; (B) is an appearance side view of a cylindrical net, and (C) is a cross-sectional side view of a member for holding a net made of a press-formed spring steel plate.

FIG. 3 is a diagram in which a cylindrical frame is extracted and drawn from among the constituent members shown in FIG. 2 described above, wherein (A) is an external perspective view,
(B) is a longitudinal sectional view, and (C) is a sectional view taken along the line CC.

FIG. 4 is an external perspective view illustrating an example of the simplest and smallest filter assembly among conventional filter assemblies.

FIG. 5 is an exploded projection view illustrating a cylindrical frame formed by metal injection, a cylindrical net housed in the cylindrical frame, and a C-ring for fastening the housed cylindrical net. (A) is a longitudinal sectional view of a tubular frame, (B) is an external side view of a tubular mesh, and (C) is a sectional view of a C-ring.

6 is a longitudinal sectional view illustrating a conventional filter assembly constructed by combining the constituent members of the exploded view shown in FIG. 5 described above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conventional cylindrical frame, 1a ... Oil passage hole, 1b ... Ring groove,
1c: ceiling surface, 2: cylindrical mesh, 3: C ring, 4: cylindrical frame of the embodiment, 4a: oil passage hole, 4c: ceiling surface, 4e: press-fitting projection, 5: mesh holding plate, 5a: cut Raised claw, 5b ... press-fit hole.

Continuation of the front page (56) References JP-A-60-132613 (JP, A) JP-A-2-28705 (JP, U) JP-A-4-14713 (JP, U) JP-A-2-8510 (JP) , U) Japanese Utility Model Hei 5-80509 (JP, U) Japanese Utility Model Hei 5-93509 (JP, U) Japanese Utility Model Hei 2-150008 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) B01D 29/11

Claims (1)

(57) [Claims] 1. A tubular frame member having an oil passage hole formed in a side wall of a cylinder having a bottom and a bottom, and a cylindrical member housed in the tubular frame member and covering the oil passage hole. A filter element comprising a mesh, wherein a mesh holding plate having an outer diameter substantially equal to the inner diameter of the cylindrical mesh is provided, and a hole is formed in a center portion of the mesh holding plate. A columnar projection is formed on the lower surface of the top wall of the cylindrical frame member having no top, and the columnar projection is formed to fit tightly with the hole of the mesh holding plate. By being sandwiched between the inner peripheral surface of the cylindrical frame member and the outer peripheral surface of the screen holding plate, the column-shaped projection is pressed into the hole of the screen holding plate, so that the screen holding plate is A filter assembly having a tubular net, which is fixed to a filter assembly.