JPS6345529Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air bleed device for bleeding out air accumulated in an oil filter for fuel oil or lubricating oil of an internal combustion engine.

(Prior Art) An oil filter for fuel oil or lubricating oil of an internal combustion engine is generally provided with an air bleed device for discharging air accumulated in the oil filter.

In conventional air bleed devices, an air bleed passage is provided at the top of the mounting bolt that passes through the element vertically, one end of which communicates with the upper end of the oil filter case, and an air bleed plug is provided to freely open and close the air bleed passage. At the same time, a configuration has been adopted in which the other end of the air bleed passage is opened to the outside through a pipe joint and an air bleed pipe (for example, Japanese Utility Model Publication No. 52-52116).

(Problems to be solved by the invention) The following problems remain in the conventional configuration described above.

(a) The air bleed pipe is in an unstable state with only one end supported by the pipe joint, and may break due to vibrations of the internal combustion engine, etc.

(b) The tip of the air bleed tube is open to the outside, and when air is bleed, air mixed with oil scatters and pollutes the area.

(c) Apart from the filter's original function of filtering out fixed impurities mixed in oil, the auxiliary function of air bleed requires a costly design that requires pipe joints and air bleed pipes. This not only causes an increase in the number of points, but also contributes to an increase in product costs.

(Means for solving the problem) The present invention provides an air vent passage that communicates the upper end of the oil filter case with the lower end of the mounting bolt in the mounting bolt that passes through the element vertically, and air An air bleed plug that freely opens and closes the bleed passage is provided, and the lower end of the air bleed passage is communicated with the drain pipe of the oil filter, so that the air in the oil filter can be discharged through the drain pipe of the oil filter. This is an air bleed device for an oil filter for internal combustion engines.

(Embodiment) In FIG. 1 showing the case where the present invention is applied to a lubricating oil filter, a drum-shaped filter element 12 is placed on the upper end surface of a filter stand 11 with a rubber packing 13 interposed therebetween. The filter element 12 has a cylindrical side surface serving as a filtering surface. Filter element 12
Filter cases 14 are arranged at intervals outside of the filter case 11, and the lower end of the cup-shaped filter case 14, which opens downward, is placed on the filter stand 11 while maintaining liquid tightness through a rubber gasket 15. has been done.
A vertical stud bolt 16 passes through the center of the filter element 12, and the filter element 12
The lower end of the stud 16 protruding from the filter stand 1
It is screwed onto the female thread formed in 1. A stud 16 projects upwardly from the filter element 12
The hole 17 at the lower end of the tightening nut 17
The female screw formed in a is screwed into the hole. The vertically intermediate portion of the tightening nut 17 is fitted into a hole formed at the center of the upper end of the filter case 14, and a hole formed at the lower end of the hexagonal head portion of the tightening nut 17 that protrudes upward from the filter case 14. O-ring 18 interposed between the annular step and the upper end surface of the filter case 14
This maintains airtightness between the filter case 14 and the tightening nut 17. Also, the stud bolt 16
The filter case 14 is fixed in a pressed state against the filter stand 11 side by the tightening nut 17 and the filter case 14 . A coil spring 19 concentric with the filter element 12 is installed between the lower surface of the upper end of the filter case 14 and the upper end surface of the filter element 12.
As a result, the filter element 12 is elastically held in pressure contact with the filter stand 11 side.

The tightening nut 17 is formed with an air vent passage 21 that opens radially inside the upper end of the filter case 14 and communicates with the hole 17a. Further, a vertical air bleed plug 22 is screwed into the center of the upper half of the tightening nut 17, and the air bleed passage 21 can be closed by its lower end. The air bleed plug 22 can be moved up and down to open or close the air bleed passage 21 by changing the degree of screwing into the tightening nut 17. A diametrically protruding handlebar is provided at the upper end of 22.

An air bleed passage 23 is formed in the center of the stud 16, the upper end of which opens into the hole 17a. As the stud bolt 16, a thick-walled pipe made of STS material or the like, which is used for, for example, a high-pressure fuel pipe of an internal combustion engine, can be adopted. In this case,
There is an advantage that it is only necessary to form male threads on both the upper and lower ends of the stud bolt 16, and there is no need to specially drill the air vent passage 23. Of course, the stud bolt 16 may be formed by drilling the air vent passage 23 in the rod.

A passage 24 is provided in the lower part of the filter stand 11, one end of which communicates with the lower end of the air vent passage 23.
The other end of the passage 24 communicates with a drain passage 25. The drain passage 25 is connected to a drain pipe 27 via a valve 26 attached to the filter stand 11, and the tip of the drain pipe 27 opens into a drain tray 28 communicating with a drain tank (not shown).
Although one is omitted in FIG. 1, a pair of filter bodies are arranged on the left and right sides of FIG. 1 on the filter stand 11, and each of the pair of filter bodies has the same structure. There is.

On the other hand, an outlet-side oil passage 30 is provided at the rear side of Fig. 1 in the upper part of the inside of the filter base 11, and an inlet-side oil passage 31 is provided at the front side, and the lower ends of both the outlet-side oil passage 30 and the inlet-side oil passage 31 open at the lower end surface of the filter base 11. The lower end outlet of the outlet-side oil passage 30 is connected to a part of the engine that requires lubrication (not shown).
The lower end of the inlet-side oil passage 31 is connected to a pump (not shown). The upper portions of the outlet-side oil passage 30 and the inlet-side oil passage 31 are branched into two parts, each of which is connected to a pair of filter bodies. The upper end of the outlet-side oil passage 30 is connected to a post-filter outlet provided in the lower center of the filter element 12, and the upper end of the inlet-side oil passage 31 is connected to a post-filter outlet provided in the lower center of the filter element 12.
The upper end of the oil passage 30 communicates with the lower end of a cylindrical gap formed between the filter case 14 and the filter element 12. A freely rotatable changeover valve 32 having a centerline perpendicular to the plane of the paper in Fig. 1 is provided at the branching point of the outlet side oil passage 30 and the inlet side oil passage 31. By rotating the changeover valve 32 with a lever 33 (Fig. 8), the changeover valve 32 can be placed in a position where both of the pair of branching passages communicate with the parts requiring lubrication (during normal operation), a position where only one of the passages communicates (when one element is disassembled and cleaned), or a position where only one of the inlets 34 is closed and the inlet side oil passage 31 communicates with the drain passage 25 (when backwashing the filter and discharging drainage).

Next, the operation will be explained. When the internal combustion engine is started and a pump (not shown) is driven, lubricating oil is filtered from the inlet side oil passage 31 through the filter element 12, and from inside the filter element 12 to the outlet side oil passage 30.
It is supplied to the lubricating parts of the engine through the

After disassembling and cleaning the element or disassembling and reassembling the piping, the air in the piping is swept away by the lubricating oil and this air accumulates in the upper part of the filter case 14, so it is necessary to bleed the air before starting the engine. It becomes necessary to carry out work. In this case, first, the switching valve 32 is rotated to a position where the inlet oil passage 31 communicates with the drain passage 25 (normal operating position).
Next, the valve 26 is opened and the air bleed plug 22 is rotated to communicate the air bleed passage 21 with the air bleed passage 23. Since the inside of the filter case 14 is pressurized by the pump, the filter case 14
The air accumulated in the upper part of the drain pipe 27 is sent to the drain pipe 27 through the air bleed passage 21, the air bleed passage 23, the passage 24, the drain passage 25, and the valve 26. If all the air in the upper part of the filter case 14 is exhausted,
Subsequently, the lubricating oil in the filter case 14 is discharged into the drain tray 28, so after confirming that the lubricating oil has started to be discharged, the valve 26 is closed, and the air bleed plug 22 is closed.
The air vent passage 21 is closed by. This completes the air removal from the filter. That is, since the air in the filter is discharged from the drain pipe 27, problems such as oil scattering in the vicinity when air is removed do not occur. In addition, when performing maintenance of the filter, etc., with the engine stopped, set the switching valve 32 to a position where the inlet side oil passage 31 and the drain passage 25 communicate with each other, and open the valve 26 to drain the oil in the filter. Discharge.

(Effect of the invention) Air bleed passages 21 and 23 are provided in the mounting bolts (studded bolts 16) that vertically penetrate the element 12, and communicate the upper end of the oil filter case 14 with the lower ends of the mounting bolts. An air bleed plug 22 that freely opens and closes the air bleed passages 21 and 23 is provided on the upper part of the air bleed passage 23.
1, 23 The lower end is connected to the drain pipe 27 of the oil filter so that the air inside the oil filter can be discharged through the drain pipe 27 of the oil filter; (a) The structure is simplified and failure modes can be reduced. can be achieved. That is, since there is no need for an air bleed pipe or the like which is in an unstable state, which was necessary in the past, problems such as breakage due to vibrations of the internal combustion engine, etc. do not occur.

(b) Since oil will not be scattered around when air is removed, there is no need to worry about oil staining the area during air removal.

(c) Since pipe joints, air bleed pipes, etc. that were previously required are no longer required, costs can be reduced by reducing the number of parts.

(Another embodiment) (a) As shown in FIG. 2, a receiving surface on which the lower end of the air bleed plug 22 is seated is formed at the upper end of the stud 16, and the air bleed passage 21
The space between the air vent passage 23 and the air vent passage 23 may be opened or closed.

(b) As shown in FIG. 3, the stud 16 and the tightening nut 17 may be integrally formed as a tightening bolt. In this case, if the thick-walled pipe is pressed and the hexagonal head part is formed integrally, the stud bolt 1 can be easily
6 and the tightening nut 17 can be integrally molded.

(c) The configuration shown in FIG. 4 can also be adopted as the filter element 12. In FIG. 4, a plate 40 located at the upper end of the filter element 12
A hole is formed in the center through which a stud bolt 16 (FIG. 1) is inserted. Further, a reverse assembly prevention baffle plate 41 is arranged below the plate 40 at a position overlapping with the plate 40, and its outer periphery is integrally fixed by screws 43 for fixing the plate 40. The reverse assembly prevention baffle plate 41 is the fifth
As shown in the figure, it is an annular member and is a press-molded product made of thin sheet metal. For example, it integrally includes a pair of bolt passage blocking portions 42 that protrude toward the center in one diameter direction. The ends of the bolt passage blocking portions 42 on the center side are separated from each other by a slight gap, but the spacing is narrower than the stud bolt 16.
(Figure 1) is set smaller than the diameter.
The passage blocking portion 42 may be other than the embodiment, for example, a radial cut or the like, and its shape is not particularly limited as long as it can satisfy the functions shown in FIGS. 6 and 7.

If this configuration is adopted as the filter element 12, the filter element 12 will operate as follows.
It is possible to prevent work errors such as assembling the parts upside down. When the filter element 12 is assembled in the normal position, the bolt passage blocking portion 42 is closed by the stud bolt 16, as shown in FIG.
The leading end of the stud 16 is pushed down and the bolt passage blocking portion 42 curves downward, allowing the stud 16 to pass through. Therefore, in this case, the filter can be assembled by passing the stud 16 through the filter element 12. On the other hand, when it is attempted to assemble the filter element 12 in an upside-down position, as shown in FIG. 7, the overlapping plates 40 prevent the bolt passage blocking portion 42 from bending. That is, the stud bolt 16 is blocked by the bolt passage blocking portion 42.
cannot penetrate through the filter element 12. In this way, the operator can easily know that the filter element 12 is upside down, so that a filter that cannot function as a filter because the filter element 12 is upside down will not be assembled.

(d) In the above embodiment, the present invention is applied to a lubricating oil filter, but it goes without saying that the present invention can be similarly applied to a fuel oil filter.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional partial view of the case where the air bleed device according to the present invention is adopted as a lubricating oil filter, FIGS. 2 and 3 are vertical cross-sectional partial views of different embodiments, and FIG.
The figures are a vertical cross-sectional partial view showing another embodiment of the filter element, FIG. 5 is a perspective view of a baffle plate for preventing reverse assembly, and FIG.
7 is a vertical sectional partial view showing one operating state of the embodiment of FIG. 4, and FIG. 8 is a partial vertical sectional view showing the embodiment shown in FIG. 1. 12...Element, 14...Case, 16...
...Shuttle bolt (example of mounting bolt), 21,
23...Air bleed passage, 22...Air bleed plug, 27...Drain pipe.

Claims (1)

[Scope of utility model registration request] An air bleed passage that communicates the upper end of the oil filter case with the lower end of the mounting bolt is provided in the mounting bolt that passes through the element vertically, and an air bleed plug that freely opens and closes the air bleed passage is provided above the air bleed passage. An air bleed device for an oil filter for an internal combustion engine, characterized in that the lower end of the air bleed passage is connected to a drain pipe of the oil filter so that air in the oil filter can be discharged through the drain pipe of the oil filter.