JPH0139844Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lubricating oil level detection device suitable for use in reciprocating equipment, particularly small general-purpose engines.

(Prior art) A device for detecting the level of lubricating oil in reciprocating equipment such as an engine uses a float suspended in a float chamber at the oil level, as described in Japanese Utility Model Application Publication No. 56-29209, for example. A float type detector is used that detects the oil amount by moving it up and down to follow the flow.

(Problems to be Solved by the Invention) However, the float type detector must be installed at a location that is less affected by the tilt of the engine, for example, approximately in the center of the oil pan. Therefore, if the space inside the oil pan is restricted,
Conventional float-type lubricating oil level detection devices have had the disadvantage of being difficult to apply, especially to small general-purpose engines, because a float-type detector cannot be placed approximately in the center of the oil pan.

Therefore, the present invention was devised in view of the above-mentioned circumstances, and the purpose of the present invention is to enable a detector such as a float type detector to be installed outside the lubricating oil chamber, and to accurately measure the lubricating oil level. The present invention provides a lubricating oil level detection device for reciprocating equipment that can detect the level of reciprocating equipment.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a reciprocating device equipped with a lubricating oil chamber in which lubricating oil is stored and on which pulsating pressure is applied by the movement of the reciprocating member. a detection chamber, a detector for detecting a liquid level in the detection chamber, a first oil passage connecting a lubricant level detection position in the lubricant oil chamber and the detection chamber; A second oil passage is provided that connects a portion of the lubricating oil chamber at a height below the oil level and the detection chamber, and the first oil passage, the detection chamber, and the second oil passage constitute a circulation path, and the The first oil passage is characterized by being provided with a one-way valve that allows flow from the lubricating oil chamber to the first oil passage, the detection chamber, and the second oil passage.

(Operation) When the liquid level in the lubricating oil chamber falls below the minimum permissible level, the lower end of the conduit faces the air above the liquid level.

If this air is under positive pressure, it will flow into the detection chamber from the first oil path and push the liquid level in the detection chamber downward, so
The liquid level will drop slightly.

Conversely, if the air becomes negative pressure, a suction force will act to raise the liquid level in the detection chamber, but at this time, the one-way valve closes and prevents the liquid level from rising above.

The air repeats positive and negative pressure, but the one-way valve allows only positive pressure to act on the liquid level in the detection chamber, so the float does not pulsate in the vertical direction and the reed switch Since it is biased toward the side, even if the liquid level in the lubricating oil chamber is undulating, the reed switch can be reliably turned on and the alarm activated as appropriate.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory diagram of the present device.

Reference numeral 1 denotes an oil pan, and 2 denotes a lubricating oil chamber. Inside the oil pan 1, a pulsating pressure having a positive pressure and a negative pressure is generated in a sinusoidal waveform due to the reciprocating motion of a piston.

The lubricating oil detection device 3 according to the present invention includes a lubricating oil chamber 2
A float-type detector 4 as a detector mounted and fixed at an appropriate location on the outside of the float-type detector 4;
and a circulation path 5 connecting the inside of the lubricating oil chamber 2.

The float type detector 4 includes a case 12 having a substantially sealed float chamber 11. A body 14 having a reed switch 13 installed in its lower part is erected in the float chamber 11, and a float 16 to which a magnet 15 is attached is disposed around the body 14.

The first oil passage 21 constituting the circulation passage 5 includes a conduit 22 attached to the side wall 1a of the oil pan so that its lower end 22a opens to the lowest allowable level 23 in the lubricating oil chamber 2, and an upper opening of the float chamber 11. It is formed by a section 24 and a tube body 25 that connects the conduit 22.

It is preferable that the lower end 22a of the conduit 22 is located at a position where the level does not change no matter what direction the engine is tilted, that is, at the center.

Further, a second oil passage 3 is provided to constitute the circulation passage 5.
1 is a location 32 at a height below the minimum allowable level 23 and a lower end opening 33 on the bottom surface of the float chamber 11.
Therefore, the first oil passage 21, the float chamber 11, and the second oil passage 31 constitute the circulation passage 5.

The first oil passage 21 is provided with a one-way valve 41 that allows flow from the lubricating oil chamber 2 to the first oil passage 21 → float chamber 11 → second oil passage 31; It is arranged in the upper end opening 24 of.

Next, the operation will be explained.

When the liquid level in the lubricating oil chamber 2 is located above the minimum allowable level 23, the liquid level in the float chamber 11 is sufficiently high as shown in FIG.
Float 16 does not actuate reed switch 13. In addition, so-called pulsating pressure is generated in the crankcase of the engine, in which the inside of the case becomes negative pressure when the piston moves up, and becomes positive pressure when the piston moves down.

However, the pulsating pressure generated in the air above the liquid level has little effect on the liquid having a damping effect, and thus the float 16 remains relatively static.

When the liquid level in the lubricating oil chamber 2 gradually decreases, the second oil passage 31 acts as a communication pipe, and the float chamber 11
Lower the liquid level.

When the liquid level in the lubricating oil chamber 2 falls below the minimum permissible level 23, the lower end 22a of the conduit 22 faces the air above the liquid level.

As mentioned earlier, this air has a pulsating pressure, so if the pressure is positive, the air flows into the float chamber 11 from the first oil passage 21 and pushes the liquid level in the float chamber 11 downward, so the liquid level decreases slightly.

Conversely, if the air becomes negative pressure, a suction force will act to raise the liquid level in the float chamber 11, but at this time, the one-way valve 41 closes and prevents the liquid level from rising.

The air repeats positive pressure and negative pressure, but one-way valve 4
Since only positive pressure is applied to the liquid level in the float chamber 11 by the action of reed switch 1, the float 16 does not pulsate in the vertical direction.
Since the reed switch 1 is biased toward the 3 side, even if the liquid level in the lubricating oil chamber 2 is undulating, the reed switch 1
3 can be turned ON to activate the alarm as appropriate.

Incidentally, when the engine is in a stopped state, the liquid level of the lubricating oil in the float chamber 11 also maintains the same state. Therefore, the float 16 does not fall, and the reed switch 13 does not turn on.

In this way, a float type detector 4 is installed outside the lubricating oil chamber 2.
Since it is sufficient to simply arrange the conduit 22 in the lubricating oil chamber 2, the present device 3 can be easily applied to small general-purpose engines where the space of the oil pan 1 is limited.

Note that even if an air vent hole is appropriately provided on the upper surface of the case 12 of the float type detector 4, the same operation as described above will occur, and by providing such an air vent hole, the float chamber 11 can be filled with lubricating oil during refueling. can.

Next, other embodiments of the present invention will be described. In the drawings, the same parts and members as in the first embodiment are given the same reference numerals.

Figure 2 shows a float type detector 6 in the second embodiment.
1 is shown. In the second embodiment, an air chamber 62 is formed in the upper part of the float chamber 11 so that almost no air is present on the upper surface of the float 16. This differs from the first embodiment in that the influence on is suppressed.

FIG. 3 shows a float type detector 71 in a third embodiment. In the third embodiment, a separation chamber 73 is partitioned from the float chamber 11 by a partition wall 72, and the influence of pulsating pressure on the float 16 is prevented in the separation chamber 73 as much as possible, and the vertical movement of the float 16 is made smoother. 74 in the figure is the float chamber 1 during refueling.
This air vent hole 74 is used to facilitate the injection of lubricating oil into the air vent hole 74, and is normally used with the air vent hole 74 closed.

In the embodiment, the case where the present device is applied to an engine has been explained, but the present device can also be applied to equipment such as an air compressor, etc., in which pulsating pressure is applied to the lubricating oil chamber by the movement of a reciprocating member such as a piston. Applicable.

In addition, in the embodiment, the lubricating oil level in the lubricating oil chamber 2 was detected using the float type detector 4 having the float chamber 11 as a substantially sealed detection chamber. The detector is not limited to a detector, and any detector may be used as long as it has a substantially sealed detection chamber and is capable of detecting the liquid level within the detection chamber.

(Effect of the invention) As is clear from the above explanation, according to the invention,
A lubricant level detector can be installed outside the lubricant room.
Furthermore, the lubricating oil level can be detected accurately and reliably.
Therefore, it exhibits excellent effects such as being suitable for use in small general-purpose engines and the like where the lubricating oil interior space is limited.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the present device, and FIGS. 2 and 3 are sectional views of float type detectors according to second and third embodiments, respectively. In the drawing, 1 is an oil pan, 2 is a lubricating oil chamber, 3 is a lubricating oil level detection device, 4, 61, 71 are float type detectors, 5 is a circulation path, 11 is a float chamber, 1
6 is a float, 21 is a first oil passage, 31 is a second oil passage, and 41 is a one-way valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A reciprocating device equipped with a lubricating oil chamber in which lubricating oil is stored and on which pulsating pressure is applied by the movement of a reciprocating member, which has a substantially sealed detection chamber; a detector for detecting the liquid level of the lubricating oil at a height below the lubricating oil level, and a first oil passage connecting the lubricating oil level detection position in the lubricating oil chamber and the detection chamber; A second oil passage is provided that connects the indoor location and the detection chamber, the first oil passage, the detection chamber, and the second oil passage constitute a circulation path, and a lubricating oil chamber is provided in the first oil passage. from the first oil road,
1. A lubricating oil level detection device for reciprocating equipment, characterized in that a one-way valve is provided that allows flow to a detection chamber and a second oil path. (2) The opening in the lubricating oil chamber of the first oil passage is
2. The lubricating oil level detection device for reciprocating equipment according to claim 1, wherein the lubricating oil level detection device for reciprocating equipment is provided at a position that maintains a substantially constant lubricating oil level regardless of the inclination of the lubricating oil chamber.