CN102758664B - Oil gauge installation structure - Google Patents

Abstract

The invention provides an oil gauge installation structure capable of preventing damage of a seal part in an oil gauge insertion hole. The oil gauge insertion hole (15) is successively provided with a guide-in part (41), the seal part (42) and a necking part (43) from the open end side. The seal part (42) is formed into a parallel hole with a smooth surface, and the inner diameter (D2) of the seal part is configured to be greater than the outer diameter (Di) of an insertion part (34) and is lower than the outer diameter (Do) of an O-shaped ring (25). The seal part (42) is disposed more outward than a conical surface (St) defined through connection of an open edge (41a) of the guide-in part (41) and an inner edge (43a) of the necking part (43).

Description

Installation structure of oil level gauge

technical field

The present invention relates to a mounting structure of an oil level gauge in an internal combustion engine for a motor vehicle, etc., and specifically relates to a technique for preventing damage to a seal portion in an insertion hole of the oil level gauge.

Background technique

An internal combustion engine for a motor vehicle (hereinafter referred to as an engine) is equipped with a lubrication system that sends oil to various parts for the purpose of lubricating a valve train, cooling a piston, and the like. In the case of a lubricating system of a wet oil sump type, engine oil is stored in an oil pan provided at a lower portion of the crankcase, and is pumped to an oil circuit by an oil pump driven by a crankshaft. The portion of the engine oil adhering to the cylinder wall and the portion mixed in the blow-by gas are burned in the combustion chamber, and thus are gradually consumed as the engine operates. Therefore, the user of the motor vehicle needs to properly check the oil level of the engine oil (ie, the storage amount of the engine oil) by using the oil level gauge.

The oil level gauge is composed of a main body of the oil level gauge and a handle (handle). An oil level detection part is formed on the lower part of the main body of the oil level gauge. The handle (handle) is integrally formed on the upper part of the main body of the oil level gauge. The adhesion state of the oil surface detection part can confirm the oil level. Among oil level gauges, the following oil level gauges are known: an oil level gauge using a rod-shaped oil level gauge body made of resin (refer to Patent Document 1); and an oil level gauge using an elastic steel plate as a raw material. An oil level gauge with a saber-shaped oil level gauge body (see Patent Document 2). Moreover, the handle is generally an injection molded product made of resin, and the handle has a cylindrical insertion part, and an elastic seal such as an O-ring is fitted outside the insertion part, and the insertion part is fitted into the oil level formed in the engine. Table insertion hole.

Patent Document 1: Japanese Patent No. 4145079

Patent Document 2: Japanese Patent Application Laid-Open No. 9-195747

Since there are a large number of auxiliary equipment, piping, and wiring in the engine, in order to facilitate the inspection work (in order to facilitate the insertion and removal of the oil level gauge), the oil level gauge insertion hole is often formed at the top of the engine. cam cover. Complementing the recent downsizing of engines, etc., it is difficult to form a metering hole formed in a cylinder head, cylinder block, etc. in a straight line from the oil level gauge insertion hole to the oil pan. In such an engine, it is inevitable to bend the main body of the oil level gauge when assembling the oil level gauge. For the oil level gauge main body made of resin, it may harden in the bent state due to exposure to the high temperature environment inside the engine Oil level gauges are often used to accurately measure the oil level, or when the main body of the oil level gauge is pulled out to check the oil level, the oil level gauge has a saber-shaped main body.

On the other hand, in recent years, in order to achieve weight reduction and cost reduction, the cam cover is often made of resin injection molding, and the main body of the oil level gauge is formed into a saber shape. In such a case, the following occurs: problem described. That is, when the inspection operator inserts/pulls out the oil level gauge, the metal oil level gauge body contacts the inner surface (seal portion) of the oil level gauge insertion hole. When the number of insertions and extractions increases, it is inevitable that burrs and wear will occur on the sealing part due to the sliding contact of the edge of the main body of the oil level gauge. As a result, when the oil level gauge is inserted and pulled out, the O-ring attached to the insertion portion may be damaged, or the O-ring may no longer be in close contact with the sealing portion, causing blow-by gas to leak. In order to avoid the above-mentioned problems, although it is also possible to integrate the collar and the cam cover by press-fitting a metal collar having an oil level gauge insertion hole, but in the case of this method, the number of constituent parts of the cam cover and the The increase in manufacturing man-hours cannot avoid a substantial increase in product costs.

Contents of the invention

The present invention has been made in view of such a background, and an object of the present invention is to provide an oil level gauge mounting structure that prevents damage to a seal portion in an oil level gauge insertion hole.

In the first aspect of the present invention, the installation structure of the oil level gauge is a structure in which the oil level gauge 21 is installed in the oil level gauge insertion hole 15 of the internal combustion engine 1, wherein the oil level gauge includes: an oil level gauge body 22, The main body of the oil level gauge is made of metal; the oil level detection part 24 is made of resin and formed on the end side of the main body of the oil level gauge; the handle 23 is formed on the The base end side of the main body of the oil level gauge, and has a cylindrical insertion portion 34; and an annular elastic seal 25, the annular elastic seal is embedded in the insertion portion, and the oil level gauge insertion hole The inner diameter of the introduction part is set to be larger than the outer diameter of the elastic seal, and the inner diameter of the introduction part is set to be larger than the outer diameter of the elastic seal. A piece is crimped on the inner periphery of the sealing part, the inner diameter of the reduced-diameter part is set to be smaller than the inner diameter of the sealing part, and the sealing part is located at a lower position than the opening edge 41a connecting the introduction part and the inner diameter of the sealing part. The tapered surface St drawn by the inner edge 43a of the reduced-diameter portion is closer to the outer side.

Furthermore, in the second aspect, the end portion of the sealing portion on the side of the introduction portion is chamfered 44 .

Furthermore, in the third aspect, the lower portion of the diameter-reduced portion is a tapered surface 47 that expands in diameter toward the insertion direction of the oil level gauge main body.

In addition, in the fourth aspect, in the state where the end of the oil level detection part is located at the diameter-reducing part, the end of the oil level detection part on the side of the handle of the oil level gauge is located at a lower position than the end of the oil level detection part. The end portion of the sealing part on the side of the introduction part is closer to the side of the introduction part.

Furthermore, in the fifth aspect, the handle has a covering portion 32 above the insertion portion, and the covering portion covers the opening end of the oil level gauge insertion hole.

Furthermore, in the sixth aspect, the oil level gauge insertion hole is formed integrally with the engine cover 6 made of resin.

According to the first aspect of the present invention, when the oil level gauge is inserted into and pulled out of the oil level gauge insertion hole, the oil level gauge main body is less likely to come into contact with the seal portion, and damage to the seal portion is suppressed. Furthermore, according to the second aspect, when the insertion portion is inserted into the oil level gauge insertion hole, the elastic seal is guided by the chamfer to enter the seal portion, and damage to the elastic seal is suppressed. In addition, according to the third aspect, when the oil level gauge is pulled out, the oil adhering to the oil level gauge main body and the oil level detection part is wiped off by the tapered surface, so the damage of the elastic seal caused by the oil flowing into the sealing part is suppressed. deteriorating. In addition, the oil becomes easy to flow back to the oil pan etc. by flowing along the tapered surface. Furthermore, according to the fourth aspect, when the oil level gauge is inserted into and withdrawn from the oil level gauge insertion hole, the oil level gauge body is less likely to come into contact with the sealing portion, and damage to the sealing portion is more effectively suppressed. Furthermore, according to the fifth aspect, even if the upper portion of the elastic seal mounting portion of the insertion portion is thinned for improved insertion operability and weight reduction, entry of foreign matter into the engine from the oil level gauge insertion hole can be suppressed. Furthermore, according to the sixth aspect, the oil level gauge insertion hole can be easily formed by injection molding.

Description of drawings

FIG. 1 is a front view of an engine according to the embodiment.

Fig. 2 is an enlarged view of part II in Fig. 1 .

Fig. 3 is a front view of the oil level gauge according to the embodiment.

Fig. 4 is a longitudinal sectional view of an oil level gauge holder according to the embodiment.

FIG. 5 is a diagram showing the operation of the embodiment.

FIG. 6 is a diagram illustrating the operation of the embodiment.

Label description:

1: engine;

6: cylinder head cover (engine cover);

11: oil level gauge holding part;

12～14: metering hole (ゲ一ジ hole);

15: Oil level gauge insertion hole;

21: oil level gauge;

22: The main body of the oil level gauge;

23: handle;

24: Oil level detection department;

25: O-ring (elastic seal);

32: flange part (covering part);

34: insertion part;

41: Import Department;

41a: opening edge;

42: sealing part;

43: reduced diameter part;

43a: inner edge;

44: chamfering;

46, 47: cone surface;

St: cone surface.

Detailed ways

Next, an embodiment in which the present invention is applied to a mounting structure of an oil level gauge in a motor vehicle engine will be described in detail with reference to the drawings. In addition, in description of embodiment, let the left side in FIG.

<Structure of Embodiment>

The engine 1 shown in Fig. 1 is an inline four-cylinder four-stroke diesel engine, and the engine 1 is composed of a cylinder block 2, a lower body 3, a cylinder head 4, an oil pan 5, a cylinder head cover 6 and the like. The cylinder head cover 6 is provided with an oil level gauge holder 11 , and on the other hand, metering holes 12 to 14 are provided through right front portions of the cylinder block 2 , the lower body 3 and the cylinder head 4 . As also shown in FIG. 2 , the oil level gauge 21 is inserted through the oil level gauge insertion hole 15 formed in the oil level gauge holder 11 , passes through the metering holes 12 to 14 , and is immersed in the oil in the oil pan 5 .

(oil level gauge)

As shown in Figure 3, the oil level gauge 21 is made up of the following parts: the oil level gauge main body 22, it is with relatively thin steel plate (such as spring steel plate) as raw material; The upper end of the gauge main body 22; the resin oil level detection part 24 integrated with the lower part of the oil level gauge main body 22;

The handle 23 is composed of the following parts: a ring-shaped part 31 for the inspection operator to hang his fingers on; a disc-shaped flange part 32 formed under the ring-shaped part 31; a shaft part 33 with a relatively small diameter. extending downward from the lower surface of the flange portion 32 ; and an insertion portion 34 with a relatively large diameter extending downward from the lower end of the shaft portion 33 . A pair of upper and lower annular grooves 35 are formed in the insertion portion 34 , and the O-ring 25 is held in these annular grooves 35 . The insertion portion 34 is formed in a cylindrical shape having a constant outer diameter Di, and a tapered portion 34a is formed at the lower end of the insertion portion 34 for easy insertion into the oil level gauge insertion hole 15 . In addition, the O-ring 25 is expanded by being fitted outside the annular groove 35 so that the outer diameter Do of the O-ring 25 is larger than the free diameter.

The oil level detecting portion 24 is integrated with the outer periphery of the oil level gauge body 22 by insert molding, and has a length L1 along the length direction of the oil level gauge body 22 .

(Oil level gauge holder)

As shown in FIG. 4 , the cylinder head cover 6 is an injection molded product of resin in which the oil level gauge holding portion 11 is integrally formed. The oil level gauge holder 11 protrudes from the upper portion of the cylinder head cover 6 , and an oil level gauge insertion hole 15 is formed in the center of the oil level gauge holder 11 . The oil level gauge insertion hole 15 is formed such that an introduction portion 41 , a seal portion 42 , and a diameter-reduced portion 43 are successively provided in this order from the opening end side.

The introduction portion 41 is set such that the inner diameter D1 of the opening edge 41a is larger than the outer diameter Do (see FIG. 3 ) of the O-ring 25 and is formed in a tapered shape gradually decreasing in diameter toward the sealing portion 42 side. Furthermore, the sealing portion 42 is formed as a parallel hole with a smooth surface, and the inner diameter D2 of the sealing portion 42 is set to be larger than the outer diameter Di (see FIG. 3 ) of the insertion portion 34 and smaller than the outer diameter Do of the O-ring 25 . Moreover, between the introduction part 41 and the sealing part 42, the chamfer 44 which makes the introduction part 41 and the sealing part 42 continue smoothly is provided. On the other hand, the narrowed portion 43 has a triangular cross-sectional shape in which the center is narrowed in the vertical direction, and the inner diameter D3 of the smallest central portion (inner edge 43a) is deliberately set smaller than the inner diameter D2 of the sealing portion 42. The upper and lower parts of 43 are formed as tapered surfaces 46 and 47 that expand in diameter upward or downward. Furthermore, the sealing portion 42 is positioned outside the tapered surface St that is drawn by connecting the opening edge 41 a of the introduction portion 41 and the inner edge 43 a of the reduced-diameter portion 43 . In this embodiment, the distance L2 between the opening edge 41a of the introduction portion 41 and the inner edge 43a of the reduced diameter portion 43 is intentionally set shorter than the length L1 of the oil level detection portion 24 of the oil level gauge 21 .

<Effect of Embodiment>

When checking the engine oil level, the inspection worker hangs his fingers on the annular portion 31 of the handle 23 and pulls the oil level gauge 21 from the oil level gauge insertion hole 15 of the cylinder head cover 6 . At this time, if the oil level gauge 21 is pulled out with the oil level gauge body 22 tilted, as shown in FIG.

However, in the present embodiment, as described above, the sealing portion 42 is located outside the tapered surface St drawn by connecting the opening edge 41a of the introduction portion 41 and the inner edge 43a of the reduced diameter portion 43. In the state where the oil level gauge main body 22 is closest to the inner circumference of the oil level gauge insertion hole 15 (even if the oil level gauge main body 22 and the opening edge 41a of the introduction part 41 and the inner edge 43a of the reduced diameter part 43 are both In a state of being in contact), a gap c is ensured between the oil level gauge main body 22 and the sealing portion 42 as well. As a result, even if the opening edge 41a of the introduction portion 41 and the inner edge 43a of the reduced-diameter portion 43 are sometimes damaged, the sealing portion 42 is no longer damaged by the edge of the oil level gauge main body 22, so that the sealing portion is less likely to occur. 42 and the O-ring 25 in contact with the inner peripheral surface of the sealing portion 42 is damaged, or the O-ring 25 is damaged due to contact with the sealing portion 42 .

On the other hand, when the oil level gauge 21 is pulled out, the oil adhering to the oil level gauge main body 22 and the oil level detection part 24 drops into the oil level gauge insertion hole 15, but the oil is wiped away by the reduced diameter part 43. It is difficult to flow into the sealing part 42 and the introduction part 41 . As a result, deterioration and swelling of the O-ring 25 due to contact with the oil is effectively suppressed, and the airtightness between the oil level gauge insertion hole 15 and the oil level gauge 21 can be maintained for a long period of time. And, the oil adhering to the reduced diameter portion 43 flows through the tapered surfaces 46 , 47 , drops into the metering holes 12 to 14 , and is quickly discharged from the oil level gauge insertion hole 15 .

On the other hand, the inspection operator inserts the oil level gauge 21 from the oil level gauge insertion hole 15 into the gauge holes 12 to 14 after checking the oil level of the engine oil. At this time, when the oil level gauge 21 is inserted with the oil level detecting portion 24 inclined, the oil level detecting portion 24 comes into contact with the inner periphery of the oil level gauge insertion hole 15 .

However, in this embodiment, since the oil level detection part 24 is made of resin, even if the tip of the oil level detection part 24 contacts, the seal part 42 will hardly be damaged or worn. And, as mentioned above, since the length L1 of the oil level detection portion 24 of the oil level gauge 21 is longer than the distance L2 between the opening edge 41a of the introduction portion 41 and the inner edge 43a of the reduced diameter portion 43, as shown in FIG. As shown, even when the oil level detecting portion 24 is inserted to a certain extent, the oil level gauge main body 22 does not come into contact with the sealing portion 42 . Furthermore, since the chamfer 44 is provided between the introduction portion 41 and the sealing portion 42 , when the insertion portion 34 is inserted into the sealing portion 42 , the O-ring 25 smoothly enters into the sealing portion 42 . Furthermore, as shown in FIG. 2, when the insertion portion 34 is completely inserted into the oil level gauge insertion hole 15, the flange portion 32 completely covers the upper end of the oil level gauge holding portion 11, even if the oil level gauge insertion hole 15 (introduction portion 41) ) and the shaft portion 33 of the handle 23, there is a relatively large gap, which can also prevent dust and the like from entering the oil level gauge insertion hole 15.

The above completes the description of the specific embodiments, but the aspects of the present invention are not limited to these embodiments. For example, in the above-mentioned embodiment, the oil level gauge main body made of a steel plate is used, but an oil level gauge main body formed by winding a steel wire into a coil shape may also be used. In addition, in the above embodiment, the oil level gauge insertion hole is formed in the cylinder head cover made of resin, but the oil level gauge insertion hole may also be formed in the cylinder head cover made of aluminum alloy or in other engine configurations. Components (cylinder heads, cylinder blocks, etc.). In addition, specific structures, shapes, materials, and the like of the oil level gauge and the oil level gauge holder can be appropriately set within a range not departing from the gist of the present invention.

Claims (4)

1. a mounting structure for oil level gage, the mounting structure of described oil level gage is insert in the hole at the oil level gage of internal-combustion engine to install the structure of oil level gage, and the feature of the mounting structure of this oil level gage is,

Described oil level gage comprises:

Oil level gage main body, described oil level gage main body is using metal as raw material;

Pasta detection unit, described pasta detection unit is using resin as raw material and be formed at the end side of described oil level gage main body;

Handle, described handle is formed at the terminal side of described oil level gage main body, and has columned insertion part; And

The elastomer seal of ring-type, is embedded in described insertion part outside the elastomer seal of described ring-type,

Described oil level gage patchhole is formed by arranging introduction part, sealed department and diameter reducing part continuously successively from open end side, the internal diameter of described introduction part is set larger than the external diameter of described elastomer seal, described elastomer seal is crimped on the inner circumferential of described sealed department, the internal diameter of described diameter reducing part is set less than the internal diameter of described sealed department

Described introduction part to be formed as towards described sealed part side undergauge gradually,

The internal diameter of described sealed department is set to, larger and less than the external diameter of described elastomer seal than the external diameter of the insertion part of described oil level gage,

Described diameter reducing part is the triangular cross-sectional configuration that above-below direction central part is retracted, and the bottom of described diameter reducing part becomes towards the expanding conical surface of direction of insertion,

Described sealed department is positioned at the conical surface position in the outer part than being depicted by the link peristome of described introduction part and the inner edge of described diameter reducing part,

Under the state that the end of described pasta detection unit is positioned at described diameter reducing part, the end of the described handle side by described oil level gage of this pasta detection unit is positioned at the position more leaning on this introduction part side than the end by described introduction part side of described sealed department.

2. the mounting structure of oil level gage according to claim 1, is characterized in that,

The end chamfering by described introduction part side of described sealed department.

3. the mounting structure of oil level gage according to claim 1, is characterized in that,

Described handle has covering part above described insertion part, and described covering part covers the opening end of described oil level gage patchhole.

4. the mounting structure of oil level gage according to claim 2, is characterized in that, described oil level gage patchhole is formed at resinous engine hood.