JPS5931303Y2 - bypass oil filter - Google Patents

Description

[Detailed description of the invention] This invention relates to a bypass oil filter.
In particular, it relates to a by-pass oil filter that is arranged in parallel with a full-flow filter in a lubrication system.

Fig. 1 (As shown in this figure, oil sucked from an oil strainer 1 is pressurized by an oil pump 2, part of the oil is filtered by a full flow filter 3, and then supplied from a gearing 4 to various parts of the engine. A bypass type lubrication system in which oil is filtered through a bypass filter 5 and returned to an oil reservoir 6 is known to be effective in improving the service life of the oil itself and the filter element 7.

In addition, in the figure, 11 is a cooling fan, 12 is a piston, 13 is a crankshaft, and 14 is a filter short valve, which is used when the M overfunction of the full flow filter 3 decreases and the oil pressure exceeds the set value. The oil can flow down to the gearbox 4 without going through the gear.

By the way, in the above-mentioned bypass type lubrication system, since the oil pressurized by the oil pump 2 is always dispersed between the full flow filter 3 and the bypass oil filter 5,
This has the problem that the oil pressure inside the gear assembly 4 decreases.

That is, the amount of oil supplied to each part of the engine decreases by an amount corresponding to the oil returned from the bypass oil filter 5 to the oil reservoir 6, and there is a risk that the oil pressure will decrease and damage the engine.

The present invention has been developed by focusing on this point, and in the bypass oil filter, a bolt hole for a center bolt for locking the filter to the cylinder body or the filter body is provided in the oil return path. At the same time, a check valve is built into the center bolt or the bolt hole, and the outlet port is formed to communicate with the oil return passage through the check valve, so that the oil is supplied to each part of the engine as described above. The objective is to eliminate problems such as a decrease in the amount of oil in the filter, and at the same time to provide a bypass filter that does not require space for new check valves or piping, is compact, and can be easily modified in design.

An embodiment of the present invention shown in FIG. 2 will be described below. In FIG.
Or filter body) 8 and its center pole) 31.
It is attached at 51.

In the body 8, there are formed an oil port 81 communicating with the oil pump 2, an oil outlet 82 communicating with the gear assembly 4, an oil return hole 83 communicating with the oil reservoir, and especially the oil return hole. 83 communicates with the bolt hole 84 of the center bolt 51.

The oil flowing down from the oil port 81 flows down from the inlet ports 32.52 of each of the filters 3 and 5, as shown by the arrows, and passes through the element 7 from each outlet port 33.53 to the oil outlet 82. Alternatively, it extends to the oil return hole 83.

As is clear from the drawings, in the second embodiment, a check valve 54 is particularly built into the center bolt 51 of the bypass oil filter 5.

That is, the bolt 51 is formed with a horizontal hole 55 that opens to the outlet port 53 and a vertical hole 56 that opens to the bolt hole 84, and a ball valve 5γ and a spring 58 are housed therein. There is.

In a bypass type lubrication system having a bypass oil filter 5 with a built-in check valve 54 as described above, when the engine speed is low and the oil pressure from the oil pump 2 is not sufficient, the entire amount of oil is limited to the full flow filter 3. When the rotational speed increases and the oil discharge amount of the oil pump increases, the ball valve 5γ compresses the spring 58 due to the oil pressure and connects the outlet port 53 of the bypass oil filter 5 with the bolt hole 84. , a portion of the oil will flow through this bypass oil filter 5.

Therefore, as mentioned above, by using a bypass oil filter, in other words, the present invention incorporates a check valve in the conventional bypass filter mounting bolt or bolt mounting hole, so that the above-mentioned drop in oil gear pressure can be prevented, and the bypass oil filter By using a bypass oil filter, problems such as a decrease in oil supplied to various parts of the engine are eliminated, and at the same time, there is no need for space for new check valves or piping, and it can be used within the space for conventional bypass oil filters and their installation space. It is extremely compact and can be installed in
Moreover, it is possible to obtain a practically extremely effective bypass filter whose design can be easily changed.

Note that even if the check valve 54 is built into the bolt hole 84, the same effect as described above can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the concept of a bypass type lubrication system.
FIG. 2 is a longitudinal sectional view of an oil filter showing an embodiment of the present invention. 2 oil pump, 3; full flow filter, 4; gear, 5; bypass oil filter, 6; oil reservoir, 8
; Cylinder body, 51; Center bolt, 54; Check valve, 81; Oil inlet, 82; Oil outlet, 83
;Oil return hole, 84;Bolt hole.

Claims (1)

[Scope of utility model registration request] Oil pump (In a bypass oil filter that filters oil that flows in from the inlet port through its element and then flows down from the outlet port to the oil reservoir via the oil return path, the filter is locked to the cylinder body or filter body. A bolt hole for a center bolt is communicated with the oil return path, and a check valve is built into the center bolt or the bolt hole, and the outlet port communicates with the oil return path through the check valve. A bypass oil filter characterized by being formed.