JPH0217612Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a line filter that is inserted into a hydraulic circuit to filter oil, and particularly to a structure for attaching and detaching the cover of the oil filter.

(Prior Art) Conventionally, there have been oil filters of this type as shown in FIGS. 4 and 5.

That is, in the above drawing, 1 is a cylindrical case with a bottom, and a flange portion 2 is formed on the outer periphery of a circular opening at the upper end of the case. A female thread 4 for screwing is provided, and an oil inlet 5 and an oil outlet 6 each having a circular shape are provided at opposing positions in the upper part of the case 1. Flanges 7 and 8 are formed on the outside of each. In addition, a drain plug 9 is screwed into the center of the lower surface of the case 1, and 10 is a drain plug 9 screwed into the center of the lower surface of the case 1.
This is a packing interposed between the center of the lower surface of the drain plug 9 and the drain plug 9. Reference numeral 11 denotes a cover that closes the circular opening of the case 1. This cover 11 is formed in the same shape as the flange portion 2 of the case 1, and has a hole 1 on its outer periphery into which the nut 3 is inserted.
2 is formed. Reference numeral 13 denotes an oil pressure detector provided at the center of the upper surface of the cover 11, and reference numeral 14 denotes a packing interposed between the upper end of the case 1 and the cover 11. 15 is a cylindrical element for filtering oil. Reference numeral 16 denotes an L-shaped joint pipe that diverts oil flowing from the inlet 5 of the case 1 to the outlet 6. The joint pipe 16 has a lower end opening 17 and a horizontal opening 18 that are electrically connected to each other. It is provided. 19 is the outlet 6 and the horizontal opening 18
It is packing that is interposed between. Further, on the opposite side of the horizontal opening 18 of the joint pipe 16, a connecting cylinder 20 that can be freely inserted into the inlet 5 is protruded, and a male thread 21 is provided on the outer periphery of the connecting cylinder 20. In addition to being engraved, an opening (not shown) is formed in a part of the outer periphery for allowing oil to flow outside.

Reference numeral 22 denotes a tightening nut which is screwed onto the male thread 21 of the above-mentioned connecting cylinder 20, and its outer shape is larger than the inlet 5. Note that the above-mentioned connecting cylinder 20 is not electrically connected to the inside of the joint pipe 16.

Reference numeral 23 denotes a ring fitting that can be freely screwed onto the male thread 21 of the above-mentioned connecting cylinder 20, and 24 refers to this ring fitting 2.
3 is a bolt for fixing it to the flange 7, 25 is a relief valve protruding from both sides of the joint pipe 16,
26 is a cylindrical packing interposed between the lower surface of the cover 11 and the upper end surface of the joint pipe 16, and 27 is a packing interposed between the upper end of the element 15 and the lower end opening 17 of the joint pipe 16. . 28 is a shaft having a predetermined length, the upper end of which is inserted into the interior of the joint pipe 16 through the lower end opening 17, and is fixed at the center of the top surface;
A screw 29 is cut into the lower end of the shaft 28. 30 is a packing inserted into the shaft 27, 31 is a flat washer, 32 is a spring washer, and 33 is a nut screwed into the screw 28 of the shaft 27.

Next, to explain the operation, first, the filter element 15 is inserted into the shaft 28 hanging from the joint pipe 16 via the packing 27, and the packing 30, the plain washer 31, and the spring washer 32 are attached to the lower end of the shaft 28 in this order. After insertion, the filter element 15 is fixed to the lower end opening 17 of the joint pipe 16 by screwing the nut 33 onto the screw 29 of the shaft 28 and tightening it. On the other hand, a tightening nut 22 is screwed onto the male screw 21 of the connecting cylinder 20 of the joint pipe 16.

Next, the joint pipe 16 is inserted into the case 1 from the element 15 side, and the horizontal opening 18 of the joint pipe 16 is inserted into the outlet 6 by packing 1.
9, and insert the front part of the connecting cylinder 20 from the tightening nut 22 into the inflow port 5. and,
If the tightening nut 22 is rotated toward the inlet 5 side, the tightening nut 22 will come into contact with the inner surface of the case 1, but if the tightening nut 22 is further rotated in the same direction, the joint pipe 16 will move toward the outlet 6 side. Therefore, the horizontal opening 18 is strongly pressed against the outlet 6. Thereafter, the ring fitting 23 is screwed onto the male screw 21 of the coupling cylinder 20 protruding from the inlet 5 to the outside, and the ring fitting 23 is fixed to the flange 7.

Once the above work is completed, place the cover 11 on the flange part 2 of the case 1 via the packing 14, and screw the nut 3 inserted into the hole 12 of the cover 11 into the female thread 4 of the flange part 2. When tightened, the cover 11 is fixed to the upper end of the case 1.
Therefore, the oil that has flowed into the case 1 from the inlet 5 flows into the interior from the outer periphery of the filter element 15 and is filtered, and then flows from the lower end opening 17 of the joint pipe 16 through the horizontal opening 18 and from the outlet 6. leak.

(Problems to be solved by the invention) As described above, the conventional oil filter has a flange portion 2 formed at the upper end opening of the case 1, and a cover that closes the upper end opening of the case 1. 11 is formed in the same shape as the flange portion 2.

Therefore, the entire filter becomes larger by the flanges of the case 1 and the cover 11, and its weight also increases. In addition, since the cover 11 uses multiple nuts 3, the case 1 during maintenance
The work of attaching and detaching the cover 11 when inspecting the inside of the filter, cleaning it, replacing the filter element, checking parts, etc. is very troublesome because each bolt must be installed or removed one by one. There were various drawbacks such as being time consuming, having poor work efficiency, and requiring a large number of parts.

The present invention was developed in order to solve the above-mentioned drawbacks, and the purpose is to provide an oil filter that is small in size and allows the cover to be attached and detached from the case easily and reliably with a small amount of force. It is.

(Means for Solving the Problems) To achieve the above object, the present invention includes a cylindrical case with a bottom, a cover for closing the opening of the case, and a filter for filtering oil installed in the case. It consists of a filter element and a joint pipe for changing the oil flow path.The opening of the case is carved with a female thread, and the cover has a male thread that can be freely screwed into the female thread. In addition, a protrusion for rotation is provided on the upper surface of the cover.

(Configuration of Embodiment) The present invention will be described below based on the embodiment shown in FIGS. 1 to 3. Note that FIG. 1 is an exploded perspective view of the oil filter according to the present invention, FIG. 2 is a vertical sectional view of the oil filter when assembled, and FIG. 3 is a plan view of the oil filter with the cover removed.

In the above drawings, 1 is a cylindrical case with a bottom, and a female screw part 2 is carved on the inner surface of a circular opening at the upper end of the case 1. Also, at opposing positions on the upper part of the case 1, circular shapes are respectively formed. An oil inlet 3 and an oil outlet 4 are provided.

Reference numeral 5 denotes a cover that closes the circular opening of the case 1, and a male screw portion 6 that can be screwed into the female screw portion 2 of the case 1 is carved on the lower surface of the cover 5. Further, on the upper surface of the cover 5, the cover 5
A plurality of protrusions 7 are formed in a radial manner to be used when rotating the
is provided. 9 is a packing interposed between the upper end of the case 1 and the cover 5.

10 is a cylindrical filter element for filtering oil; 11 is an L-shaped joint pipe that diverts oil flowing from the inlet 3 to the outlet 4;
This joint pipe 11 is provided with a lower end opening 12 and a horizontal opening 13 that are electrically connected to each other. Further, on the opposite side of the horizontal opening 13 of the joint pipe 11, an elastic body 14 such as a leaf spring or a spring is fixed with a bolt 15, and the width of this elastic body 14 is formed to be approximately the same as the inner diameter of the case 1. has been done. 16 is a relief valve protruding from both sides of the joint pipe 11; 17 is a packing interposed between the horizontal opening 13 of the joint pipe 11 and the outlet 4 of the case 1; and 18 is the upper end surface of the joint pipe 11. This is a cylindrical packing interposed between the cover 5 and the lower surface of the cover 5.

Reference numeral 19 denotes a packing interposed between the lower end opening 12 of the joint pipe 11 and the upper end of the filter element 10.
A circumferential groove 20 is formed to fit into the groove a.

Reference numeral 21 denotes a drain plug fixed to the center of the lower surface of the case 1. A protrusion 21a for preventing the filter element 10 from falling is formed at the upper end of the drain plug 21. Reference numeral 22 denotes a drain plug fixed to the center of the lower surface of the case 1. This is a packing that is interposed between 21 and 21. In addition, in the figure, 23 is an air vent plug fixed to the cover 5, and is connected to the outlet 4 side by a pipe 24.

(Operation of Example) Next, to explain the operation, first, the filter element 10 is inserted into the circumferential groove 20 of the packing 19.
The filter element 10 is fixed to the lower end opening 12 of the joint pipe 11 by fitting the inner peripheral edge 10a of the upper end and press-fitting the packing 19 into the lower end opening 12 of the joint pipe 11.

Next, the joint pipe 11 is inserted into the case 1 from the filter element 10 side, and both ends of the elastic body 14 are deformed forward (toward the horizontal opening 13 side), and in this state, the joint pipe 11 is inserted into the outlet 4. The horizontal opening 13 is brought into contact with the packing 17. When the above-described deformation of the elastic body 14 is released, both ends of the elastic body 14 are restored and come into contact with the inner surface of the case 1, but as described above, the width of the elastic body 14 is the same as the inner diameter of the case 1. formed into, and
Since the position of the elastic body 14 is deviated from the diametrical position of the case 1, the horizontal opening 13 of the joint pipe 11 is strongly pressed against the outlet 4 by the elastic force of the elastic body 14 that tends to expand.

When the above work is completed, screw the male threaded part 6 of the cover 5 into the female threaded part 2 of the case 1 via the packing 9, and lock a rotating tool such as a spanner to the protrusion 7 of the cover 5. When the cover 5 is rotated and tightened, the cover 5 is firmly fixed to the upper end of the case 1.

Therefore, the oil that has flowed into the case 1 from the inlet 3 flows into the interior from the outer periphery of the filter element 10 and is filtered, and then flows from the lower end opening 12 of the joint pipe 11 through the horizontal opening 13 and from the outlet 4. leak.

In the above embodiment, the protrusions 7 formed on the upper surface of the cover 5 are formed radially, but the present invention is not limited to this, and the cover 5 may be arranged so that it can be rotated by a rotary tool.

(Effects of the invention) As mentioned above, the oil filter according to the invention has the following effects:
A cylindrical case 1 with a bottom, a cover 5 that closes the opening of the case 1, and a filter element 10 installed in the case 1 to filter oil.
and a joint pipe 11 for changing the oil flow path.
The opening of the case 1 is formed with a female threaded part 2, the cover 5 is formed with a male threaded part 6 that can be freely screwed into the female threaded part 2, and the upper surface of the cover 5 is provided with a rotating part. Since the cover 5 has a structure in which the protrusion 7 is protruded, the cover 5 can be easily and quickly attached to and detached from the case 1 by simply rotating the cover 5, thereby improving work efficiency. If possible, if a rotary tool such as a spanner is engaged with the protrusion 7 of the cover 5, the cover 5 can be reliably tightened with a small rotational force, and can withstand use from low to high pressures. Further, since the cover 5 is reinforced by the protrusions 7 of the cover 5 and flanges are not required on the case 1 and the cover 5, the entire filter can be made smaller and lighter.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an oil filter according to the present invention, Fig. 2 is a longitudinal sectional view of the oil filter when assembled, and Fig. 3 is a plan view of the oil filter with the cover removed.
Figure 4 is an exploded perspective view of a conventional oil filter.
FIG. 5 shows a partially cutaway front view of the assembly. DESCRIPTION OF SYMBOLS 1... Case, 2... Female thread part, 5... Cover, 6... Male thread part, 7... Projection part, 10... Filter element, 11... Joint pipe.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical case with a bottom, a cover that closes the opening of the case, a filter element installed inside the case to filter oil, and a joint pipe to change the oil flow path. ,
A female thread is carved into the opening of the case, a female thread is formed on the cover that can be freely screwed into the female thread, and a protrusion for rotation is provided on the top surface of the cover. oil filter.