JP6143481B2 - Oil level gauge structure - Google Patents

Description

  The present invention relates to a structure of an oil level gauge for measuring the level of a lubricating oil level in an internal combustion engine, that is, an oil level.

  2. Description of the Related Art Conventionally, as described below, the structure of an oil level gauge for measuring the level of lubricating oil level inside an internal combustion engine, that is, the oil level, has been adopted. That is, a conventional oil level gauge has a cylindrical guide part, a plug that passes through the guide part and is attached to the guide part, and an inner periphery of the guide part provided on the outer periphery of the plug. A seal portion closely contacting the surface; and an oil level display portion disposed below the plug. In the oil level gauge having such a structure, the oil level display portion is inserted into the guide portion from above to pass through the guide portion, and then the plug is inserted into the guide portion from above. The flange portion provided on the guide portion is brought into contact with the upper surface of the guide portion, and the seal portion is brought into close contact with the inner peripheral surface of the guide portion to be attached to the internal combustion engine. Here, the seal portion is provided to prevent leakage of blow-by gas filled in the guide portion into the atmosphere.

  By the way, in particular, when the level of the lubricating oil inside the internal combustion engine reaches above the lower end of the guide portion, the following problems may occur. That is, in such a case, since the inside of the guide portion and the inside of the other part of the crankcase are not communicated, when the plug is inserted into the guide portion, the inside of the guide portion, more strictly, the seal The air below the portion where the portion is in close contact with the inner wall of the guide portion is compressed, so that the liquid level inside the guide portion is pushed down by the air and descends. At this time, there may be a problem that the height dimension of the portion where the oil adheres to the oil level display portion becomes small, that is, the oil amount is underestimated.

  As one of the constitutions for solving such a problem, a through hole provided in a cylindrical guide portion and a relative to the through hole of the plug that passes through the guide portion and is attached to the guide portion. A structure of an oil level gauge having a notch groove provided at a facing position and an oil level display portion arranged below the plug and omitting the seal portion is considered (for example, see Patent Document 1). reference). According to such an oil level gauge structure, when the plug is inserted into the guide portion, the through hole and the notch groove function as an air escape portion for opening the inside of the guide portion to the atmosphere. Therefore, it is possible to prevent the occurrence of the problem that occurs when the air inside the guide portion described above is compressed.

  However, in the structure described in Patent Document 1 described above, there is a problem in that a defect as described below may newly occur because the seal portion is omitted. In other words, when at least a part of the lower end of the guide part is above the liquid level, such as when the lubricating oil of the internal combustion engine decreases or the guide part tilts during running on a slope, the inside of the guide part and the inside of the crankcase There is a problem that the blow-by gas inside the crankcase can be released into the atmosphere through a gap between the guide portion and the plug.

Japanese Utility Model Publication No. 4-117128

  The present invention pays attention to the above points, and the air inside the guide part is compressed when the plug of the oil level gauge is inserted into the guide part while preventing the occurrence of the problem that the blow-by gas inside the crankcase is released into the atmosphere. The purpose is to eliminate the problem of underestimating the amount of oil that occurs with the operation.

In order to solve the above problems, the structure of the oil level gauge according to the present invention has the following structure. That is, one of the structures of the oil level gauge according to the present invention includes a cylindrical guide portion, a plug that passes through the guide portion and is attached to the guide portion, and the guide provided on the outer periphery of the plug. An oil level gauge structure having a seal part in close contact with the inner peripheral surface of the part and an oil level display part arranged below the plug , wherein the plug is parallel to the inner surface of the guide part and the A vertical surface closely contacting the inner surface of the guide portion, and a tapered surface adjacent to the lower side of the vertical surface and inclined so as to be separated from the inner surface of the guide portion as it goes downward, and the seal portion of the plug communication between the right under said tapered surface, the inside of the guide portion when inserting the plug into the interior of the guide portion provided with a air relief portion for opening to the atmosphere a portion of the outer peripheral surface of the plug That.

In addition, another structure of the oil level gauge according to the present invention includes a cylindrical guide part, a plug that passes through the guide part and is attached to the guide part, and an outer periphery of the plug. The oil level gauge has a seal portion that is in close contact with the inner peripheral surface of the guide portion and an oil level display portion that is disposed below the plug , wherein the plug is parallel to the inner surface of the guide portion. And a vertical surface closely contacting the inner surface of the guide portion, and a tapered surface adjacent to the lower side of the vertical surface and inclined so as to be separated from the inner surface of the guide portion as it goes downward. immediately below the sealing portion and communicating with said tapered surface is provided with air relief portion for internal said guide portion is opened to the atmosphere when inserting the plug into the interior of the guide portion in the interior of the plug .

If it is something like this, when inserting the plug of the oil level gauge into the guide part, the air inside the guide part passes through the gap between the air escape part provided in the plug and the guide part and enters the atmosphere Since it is discharged, under-evaluation of the oil amount due to compression of the air inside the guide part and lowering of the liquid level can be prevented, while a seal part is provided on the outer periphery of the plug. Is in close contact with the inner peripheral surface of the guide portion, it is possible to prevent the occurrence of a problem that blow-by gas inside the crankcase is released into the atmosphere.

  According to the present invention, the air inside the guide portion is compressed when the plug of the oil level gauge is inserted into the guide portion, while preventing the occurrence of a problem that the blow-by gas inside the crankcase is released into the atmosphere. The trouble which underestimates the oil amount which arises with it can be eliminated.

Schematic which shows the structure of the oil level gauge which concerns on the 1st reference example relevant to this invention. The enlarged view of the principal part in FIG. The cross-sectional view which shows the guide part which concerns on the reference example . Explanatory drawing which shows the effect | action at the time of insertion of the plug which concerns on the same reference example . Schematic which shows the structure of the oil level gauge which concerns on 1st embodiment of this invention. The cross-sectional view which shows the state which inserted the plug in the guide part which concerns on the embodiment. Explanatory drawing which shows the effect | action at the time of insertion of the plug which concerns on the embodiment. Schematic which shows the structure of the oil level gauge which concerns on the 2nd reference example relevant to this invention. Schematic which shows the structure of the oil level gauge which concerns on 2nd embodiment of this invention. Schematic which shows the plug and air escape part which concern on the 3rd reference example relevant to this invention.

Prior to the description of the present invention, a first reference example related to the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, an oil level gauge G1 according to this reference example includes a cylindrical guide portion 1 and a plug 2 that passes through the guide portion 1 and is attached to the guide portion 1. And an O-ring 3 which is a seal portion provided on the outer periphery of the plug 2 and is in close contact with the inner peripheral surface 1 a of the guide portion 1, and an oil level display portion 4 mounted below the plug 2.

  The guide portion 1 is disposed in a fixed state in the crankcase C, has a cylindrical shape as described above, and opens upward and downward.

  The plug 2 includes a plug main body 21 that can be accommodated in the upper portion of the guide portion 1, and an upper end surface of the guide portion 1 that is provided above the plug main body 21 and is accommodated in the guide portion 1. And a flange 22 that strikes 1b. The plug 2 includes a core member 2a disposed in the center portion in plan view and a cover member 2b surrounding the core member 2a. The inner peripheral surface 3 a of the O-ring 3 is in contact with the outer peripheral surface 2 c of the plug 2. And from the lower end of this plug 2, the said oil level display part 4 is extended below.

  As described above, the O-ring 3 has its inner peripheral surface 3 a in contact with the outer peripheral surface 2 c of the plug 2 and its outer peripheral surface 3 b is in close contact with the inner peripheral surface 1 a of the guide portion 1. The O-ring 3 functions as an airtight means for preventing air containing blowby gas from leaking upward from the space below it.

  The oil level display part 4 is a member having an elongated plate shape or a rod shape extending in the vertical direction, that is, the insertion / removal direction, and the lower end portion thereof reaches below the oil surface of the lubricating oil. The oil level display unit 4 also includes a core material 4a disposed in the center portion in plan view and a cover material 4b surrounding the core material 4a. The core material 4a and the cover material 4b are both integrated with the core material 2a and the cover material 2b of the plug 2. When the oil level indicator 4 is extracted from the crankcase C, the lubricating oil in the crankcase C is attached to the lower end. That is, the oil level display unit 4 has a function of detecting the height of the liquid level based on the height dimension of the portion to which the lubricating oil is attached.

Accordingly, in this reference example , as shown in FIGS. 1 to 3, the upper portion of the guide portion 1, more specifically, above the O-ring 3 in a state where the plug 2 is inserted into the guide portion 1 to the maximum. The plug 2 is placed on the guide portion 1 in a portion located above the O-ring 3 in a state where the flange portion 22 of the plug 2 is abutted against the upper end surface 1a of the guide portion 1. An air escape portion 5 is provided for opening the inside of the guide portion 1 to the atmosphere when inserted into the inside. In this reference example , the air escape portion 5 is a groove extending in the insertion / removal direction of the plug 2, that is, the vertical direction.

That is, in this reference example , when the plug 2 of the oil level gauge G1 is inserted into the guide portion 1, the O-ring 3 is positioned above the guide portion 1 as shown in FIG. After the air in the guide portion 1 is pressed by the plug 2, it is discharged into the atmosphere through a gap between the air escape portion 5 and the plug 2. On the other hand, when the flange portion 22 of the plug 2 is in contact with the upper end surface 1a of the guide portion 1, the O-ring 3 is positioned above the lower end of the air escape portion 5, and as described above, The ring 3 is in close contact with the inner peripheral surface 1 a of the guide portion 1. Therefore, the O-ring 3 prevents the air containing the blow-by gas in the crankcase C below the O-ring 3 from leaking into the atmosphere.

In other words, according to this reference example, when the plug 2 of the oil level gauge G1 is inserted into the guide portion 1, the air inside the guide portion 1 passes through the gap between the air escape portion 5 and the plug 2. Since it is discharged into the atmosphere, it is possible to prevent under-evaluation of the oil amount due to the air in the guide portion 1 being compressed and the liquid level being lowered, and the O-ring 3 ensures airtightness inside the crankcase C. In addition, it is possible to prevent the occurrence of a problem that blow-by gas inside the crankcase C is released into the atmosphere.

Next, a first embodiment of the present invention will be described below with reference to FIGS. In addition, the same name and code | symbol are attached | subjected to each site | part corresponding to the thing in the 1st reference example mentioned above.

  As shown in FIG. 5, the oil level gauge G <b> 2 according to the present embodiment also has a cylindrical guide portion 1, a plug 2 that passes through the guide portion 1 and is attached to the guide portion 1, and the plug 2 is provided with an O-ring 3 that is a seal portion that is provided on the outer periphery of the guide portion 2 and is in close contact with the inner peripheral surface 3 a of the guide portion 1, and an oil level display portion 4 that is mounted below the plug 2. Only differences from the first embodiment will be described below.

  In this embodiment, the said guide part 1 has comprised the same cross-sectional shape over the whole height dimension. On the other hand, as shown in FIG. 5 and FIG. 6, when the plug 2 is inserted into the inside of the guide portion 1, the inside of the guide portion 1 is placed in a portion located below the seal portion of the plug 2. An air escape portion 6 is provided for opening to the atmosphere. In the present embodiment, the air escape portion 6 is a groove extending in the insertion / removal direction of the plug 2, that is, the vertical direction.

  That is, in this embodiment, when the plug 2 of the oil level gauge G2 is inserted into the guide part 1, as shown in FIG. 7, while the O-ring 3 is positioned above the guide part 1, After the air in the guide portion 1 is pressed by the plug 2, the air is discharged into the atmosphere through a gap between the air escape portion 6 and the guide portion 1. On the other hand, when the flange portion 22 of the plug 2 is in contact with the upper end surface 1a of the guide portion 1, the O-ring 3 is located above the lower end of the air escape portion 6, and as described above. The O-ring 3 is in close contact with the inner peripheral surface 1 a of the guide portion 1. Therefore, the O-ring 3 prevents the air containing the blow-by gas in the crankcase C below the O-ring 3 from leaking into the atmosphere.

  In other words, also in this embodiment, when the plug 2 of the oil level gauge G2 is inserted into the guide part 1, the air inside the guide part 1 passes through the gap between the air escape part 6 and the guide part 1. Since it is discharged into the atmosphere, it is possible to prevent under-evaluation of the oil amount due to the air in the guide portion 1 being compressed and the liquid level being lowered, and the O-ring 3 ensures airtightness inside the crankcase C. In addition, it is possible to prevent the occurrence of a problem that blow-by gas inside the crankcase C is released into the atmosphere.

  The present invention is not limited to the embodiment described above.

For example, in the first reference example described above, a groove provided in the upper portion of the guide portion and extending in the positive insertion / removal direction is provided as the air escape portion, but as a second reference example having the same effect , that the inside and the outside of the guide portion 1 to the upper portion of the guide portion 1 as an air escape portion 5 provided with the air holes communicating the like.

Moreover, in the first embodiment described above, a groove provided on the outer peripheral surface of the plug and extending in the insertion / removal direction of the plug is provided as the air escape portion, but as a second embodiment, as shown in FIG. The thing which forms the groove | channel which one part extends in the circumferential direction of the plug 2 as the air escape part 6 is mentioned. Further, as a third reference example having the same effect, as shown in FIG. 10, the plug body 21 is a protrusion 211 protruding in the radial direction to a position where the part of the plug body 21 approaches the guide portion 1. The thing of the structure whose other site | parts are the air escape part 6 is mentioned.

Here, the configuration of the oil level gauge according to the second reference example described above with reference to FIG. 8 is the same as the configuration of the oil level gauge according to the first reference example except for the points described above. The reference electrolyte previous predicate the second embodiment, and the configuration of the oil level gauge according to the third reference example described above with reference to FIG. 10 to FIG. 9, in terms other than both the aforementioned first The configuration is the same as that of the oil level gauge of the embodiment.

  Further, the seal portion is not limited to the O-ring, and a member capable of shielding the space below the seal portion from the space (atmosphere) above the seal portion, such as a bellows-like airtight member formed of an elastic member such as rubber. Anything may be used.

  In addition, various changes may be made without departing from the spirit of the present invention.

G1, G2 ... Oil level gauge 1 ... Guide part 2 ... Plug 3 ... Seal part (O-ring)
4 ... Oil level display section 5, 6 ... Air escape section

Claims (2)

A cylindrical guide part,
A plug that passes through the inside of the guide portion and is attached to the guide portion;
A seal portion provided on an outer periphery of the plug and in close contact with an inner peripheral surface of the guide portion;
An oil level gauge having an oil level indicator disposed below the plug,
The plug is inclined so that it is parallel to the inner surface of the guide portion and close to the inner surface of the guide portion, and is separated from the inner surface of the guide portion as it is adjacent to the lower side of the vertical surface and moves downward. Having a tapered surface,
An air escape portion for communicating the portion directly below the seal portion of the plug with the taper surface and opening the inside of the guide portion to the atmosphere when the plug is inserted into the guide portion is an outer periphery of the plug. An oil level gauge structure characterized by being provided on a part of the surface . A cylindrical guide part,
A plug that passes through the inside of the guide portion and is attached to the guide portion;
A seal portion provided on an outer periphery of the plug and in close contact with an inner peripheral surface of the guide portion;
An oil level gauge having an oil level indicator disposed below the plug,
The plug is inclined so that it is parallel to the inner surface of the guide portion and close to the inner surface of the guide portion, and is separated from the inner surface of the guide portion as it is adjacent to the lower side of the vertical surface and moves downward. Having a tapered surface,
Communication between the right under said tapered surface of said sealing portion of said plug, inside the air escape portion for the internal said guide portion is opened to the atmosphere when inserting the plug into the interior of the guide portion and the plug structure of the oil level gauge, characterized in that provided for the.

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