JP4882941B2 - Two-tank oil pan drain plug, two-tank oil pan inner tank plug and two-tank oil pan drain structure - Google Patents

Description

  The present invention relates to a drain plug for a two-tank oil pan, an inner tank plug for a two-tank oil pan, and a drain structure for a two-tank oil pan.

  Conventionally, engine oil has been used for engine lubrication and cooling. This engine oil is stored in an oil pan provided at the lower part of the engine, and is sent to each part of the engine by an oil pump and circulated. The engine oil that has circulated through each part of the engine is dripped into the lower oil pan. And the engine oil dripped in the oil pan is sent out again to each part of the engine by the oil pump. During this time, the engine oil receives heat from each part of the engine and cools each part. The engine oil also has a role of forming an oil film in each part of the engine to promote lubrication between the parts and preventing oxidation of the parts.

  Here, immediately after the cold start of the engine, the engine oil stored in the oil pan is cold, the viscosity is high, and it is not in a state suitable for circulating each part of the engine and lubricating each part. Therefore, immediately after the cold start, it is desired to raise the temperature of the engine oil as soon as possible so as to have an appropriate viscosity. On the other hand, for example, Patent Document 1 discloses a two-tank oil pan in which an oil pan is divided into two tanks, an inner tank and an outer tank. In the two-tank oil pan, it is possible to raise the temperature of the engine oil in the inner tank earlier by creating a situation in which the engine oil is easily circulated in the inner tank immediately after the cold start. Such an early temperature rise of engine oil contributes to an improvement in fuel efficiency due to an early reduction of friction, and an improvement is also desired from the recent strong demand for an improvement in fuel efficiency. Patent documents 2 and patent documents 3 are documents which disclose the technique which makes an oil pan two tanks.

Japanese Utility Model Publication No. 56-169406 JP 2006-105118 A JP 2007-138792 A

  In order to raise the temperature of the engine oil early, it is necessary to apply a drain structure that can appropriately seal the drain hole for the inner tank and the drain hole for the outer tank. On the other hand, in the two-tank oil pan proposed in Patent Document 1, the inner tank drain hole and the outer tank drain hole are both positioned on the same axis, and the inner tank drain hole and the outer tank are formed by one drain plug. The drain holes for use are sealed together. However, in such a structure, if an error occurs in positioning of the drain hole for the inner tank and the drain hole for the outer tank, there is a possibility that the sealing performance of the drain hole for the inner tank cannot be secured. Even if the drain structure can properly seal the drain hole for the inner tank and the drain hole for the outer tank, if such a drain structure is a structure that requires special work when oil is changed, In addition to the worsening of the nature, there is a risk of causing work errors. For this reason, it is desirable that the drain structure of the two-tank oil pan should be able to exchange oil with good workability according to the conventional procedure (that is, only by detaching / attaching one drain plug).

  Therefore, the present invention can properly seal the drain plug for the two-tank oil pan and the drain structure for the two-tank oil pan with the drain hole for the inner tank and the drain hole for the outer tank, and can also ensure the workability of oil replacement. The challenge is to make things.

The drain plug of the two-tank oil pan of the present invention that solves this problem is an inner tank plug that seals the drain hole for the inner tank by coming into contact with the drain hole for the inner tank of the two-tank oil pan from below. And an outer tank plug for sealing an outer tank drain hole of the two-tank oil pan, and the inner tank plug and the outer tank plug are disposed between the inner tank plug and the outer tank plug. And an elastic member that abuts on the drain hole for the inner tank and shortens in a state where the plug for the outer tank seals the drain hole for the outer tank .

  With this configuration, when the outer tank drain hole is sealed with the outer tank plug, the inner tank plug can be pressed against the inner tank drain hole with the shortened elastic member. As a result, when the outer tank drain hole is sealed with the outer tank plug, the inner tank drain hole can be sealed simultaneously with the inner tank plug, so the inner tank drain hole and the outer tank drain hole are properly sealed. it can. In addition, according to the drain plug of the two-tank oil pan of the present invention, the operation at the time of oil replacement is the operation of detaching the drain plug from the drain hole for the outer tank, so that the oil replacement workability can be ensured.

The drain plug of such a two-tank oil pan has an inner tank drain hole and an outer tank drain hole in which the inner tank plug and the outer tank plug are arranged substantially coaxially, respectively. It can be set as the structure sealed . That is, even if the misalignment occurs between the drain hole for the inner tank and the drain hole for the outer tank arranged substantially coaxially, according to the drain plug of the two-tank oil pan of the present invention, the inner tank The plug can be moved back and forth and right and left within a predetermined area by the elastic member, so that it can cope with the misalignment, and an appropriate seal of the drain hole for the inner tank can be obtained by pressing the inner tank plug by the elastic member. Be expected.

In addition, the drain plug of such a two-tank oil pan may include a magnet for fixing the inner tank plug in contact with the inner tank drain hole with a magnetic force . With such a configuration, the inner tank plug can be in close contact with the inner tank so as to block the inner tank drain hole, and the inner tank drain hole can be more reliably sealed. The magnet can be arranged on either or both of the inner tank plug and the inner tank drain hole.

Further, the drain plug of such a two-tank oil pan is provided with a drain bolt that seals the drain hole for the outer tank as the outer tank plug by being tightened into the drain hole for the outer tank. It can be set as the structure provided with the connection part which connects the plug for tanks rotatably with respect to the said plug for inner tanks . With such a configuration, the oil can be changed with good workability according to the conventional procedure. Moreover, by setting it as such a structure, it can prevent that the inner tank plug which sealed the drain hole for inner tanks rotates with the plug for outer tanks, Therefore The deterioration of workability | operativity can also be prevented.

The drain structure of the two-tank oil pan of the present invention is an inner tank plug that seals the drain hole for the inner tank by contacting the drain hole for the inner tank of the two-tank oil pan from below, An outer tank plug that seals the drain hole for the outer tank of the two-tank oil pan is disposed between the inner tank plug and the outer tank plug, and the inner tank plug is used for the inner tank. An elastic member that abuts on the drain hole and shortens in a state where the outer tank plug seals the outer tank drain hole, and guide means for guiding the inner tank plug into the inner tank drain hole. It is characterized by having. By adopting the configuration including the guide means, the inner tank plug can be guided to the periphery of the inner tank drain hole when the drain plug is mounted, and the inner tank drain hole can be easily blocked by the inner tank plug. The guide means functions as the guide means if the magnet as described above is arranged, and may be configured to provide a tapered guide that spreads downward around the drain hole for the inner tank.

The inner tank plug of the present invention is located in the outer tank of the two-tank oil pan and below the drain hole for the inner tank of the two-tank oil pan, and generates buoyancy in the engine oil. It is characterized by having means for locking to the drain hole for use . The drain structure of another two-tank oil pan of the present invention includes an outer tank plug that seals a drain hole for an outer tank of the two-tank oil pan, an outer tank of the two-tank oil pan, and the two tanks. And a float type internal tank plug that is located below the drain hole for the internal tank of the oil pan and generates buoyancy in the engine oil .

  By adopting such an inner tank plug and drain structure, the inner tank drain hole can be sealed with the inner tank plug that is likely to float when the engine oil is stored in the two-tank oil pan. Therefore, by adopting such a configuration, the outer tank drain hole is sealed with the outer tank plug, and the inner tank drain hole and the outer tank drain hole are simply stored by storing the engine oil in the two-tank oil pan. Can seal properly. Also, when removing the engine oil, the level of the engine oil stored in the outer tank is lowered by removing the outer tank plug, and the inner tank plug that has received no buoyancy opens the inner tank drain hole. The engine oil can be extracted not only from the outer tank but also from the inner tank. In other words, with such a configuration, the engine oil can be extracted from the inner tank simply by removing the outer tank plug, so that the workability of oil replacement can be ensured.

Moreover, the drain structure of such a two tank type oil pan can be made into the structure which formed the part contact | abutted to the said inner tank drain hole among the said inner tank plugs in hemispherical form . By setting it as such a structure, the plug for inner tanks can be made to line-contact with respect to the drain hole for inner tanks, and the sealing performance by buoyancy can be improved.

Moreover, the drain structure of such a two tank type oil pan can be set as the structure which formed in the taper shape which expands the part which the said plug for inner tanks contacts among the said drain holes for inner tanks . By setting it as such a structure, the inner tank plug can be more suitably line-contacted with the inner tank drain hole, and the inner tank drain hole can be further appropriately sealed.

In addition, such a two-tank oil pan drain structure includes a position regulating member for positioning an inner tank plug below the inner tank drain hole, through the inner tank drain hole. It can be configured to be connected to an electrical plug . By setting it as such a structure, the position of the plug for inner tanks in an outer tank can be controlled, and the drain hole for inner tanks can be sealed more appropriately.

  The drain plug of the two-tank oil pan and the drain structure of the two-tank oil pan of the present invention can appropriately seal the drain hole for the inner tank and the drain hole for the outer tank, and can also ensure the workability of oil exchange.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an oil pan structure 1A having a two-tank oil pan 20A as a cross section. The oil pan structure 1 </ b> A includes a lower structure 2 attached to a lower portion of an engine block (not shown), and a main oil pan 3 </ b> A provided at the lower portion of the engine block via the lower structure 2. The lower structure 2 and the main oil pan 3A are fixed with bolts.

  The oil pan structure 1A includes a recess 4 and a sub oil pan 5A installed inside the main oil pan 3A. The sub oil pan 5A forms a concave inner tank 6 and an outer tank 7 located around the inner oil tank 3A. Such a sub oil pan 5A is divided into an upper body 5a and a lower body 5b. The upper body 5 a includes the side wall 4 a of the recess 4, and the lower body 5 b includes the bottom 4 b of the recess 4.

  The upper body 5a of the sub oil pan 5A is formed integrally with the lower structure 2. That is, the upper body 5a is formed by injection molding together with the lower structure 2. The lower body 5b is bonded to the lower side of the upper body 5a thus formed, and further bolted. Thereby, the concave sub oil pan 5A is formed.

  The upper end of the upper body 5a constitutes a communication part for engine oil. As is clear from the drawing, the cross section of the upper end portion 5a has different heights, the lower upper end portion constituting the first communication portion 8 and the higher upper end portion constituting the second communication portion 9. Yes. The sub-oil pan 5 is returned to the engine oil that circulates in the engine block and drops. In order to prevent the engine oil returned to the inside of the lower structure 2 from directly entering the outer tub 7, the first rod 10 and the second rod are covered so as to cover the first communication portion 8 and the second communication portion 9. 11 is provided. The second rod 11 includes a recess 11a, and a thermostat valve 12 that opens and closes according to the temperature of the engine oil stored in the recess 11a is attached to the recess 11a.

  Inside the inner tank 6, a suction port of the strainer 13 is arranged. Accordingly, the engine oil supplied into the engine block is supplied from the inner tank 6. When the engine is warmed up after starting, a small amount of engine oil in the inner tub 6 is mainly used for lubrication, so that the engine oil can be heated up quickly and the viscosity of the engine oil can be reduced quickly, reducing friction. Can be achieved. However, when the engine oil in the inner tank 6 is supplied to the lubrication part such as in the engine block, the oil level in the inner tank 6 is lowered. When the oil level is lowered to the first communication portion 8, the engine oil in the outer tub 7 is moved into the inner tub 6 due to the difference in height between the first communication portion 8 and the second communication portion 9 thereafter. To flow into.

  Further, when the temperature of the engine oil returned from the engine block side and stored in the recess 11a of the second rod 11 becomes high and the thermostat valve 12 is opened, the engine oil returned from the engine block flows into the outer tub 7. To do. The engine oil that has directly flowed into the outer tub 7 is mixed with the engine oil stored in the outer tub 7, and then flows into the inner tub 6 through the first communication portion 8, and is used for lubrication again. The thermostat valve 12 is always immersed in the engine oil in the recess 11a, so that sticking due to blow-by gas or the like hardly occurs, and wear of the seal portion is reduced.

  Such an oil pan structure 1A includes a two-tank oil pan 20A including a main oil pan 3A and a sub oil pan 5A. The main oil pan 3A is provided with an outer tank drain hole M1 for extracting engine oil from the outer tank 7, and the sub oil pan 5A is provided with an inner tank drain hole M2 for extracting engine oil from the inner tank 6. The outer tank drain hole M1 and the inner tank drain hole M2 are arranged substantially coaxially. A drain plug for a single two-tank oil pan (hereinafter simply referred to as a drain plug) 30A is attached to the drain hole M1 for the outer tank.

  Next, the drain plug 30A will be described in detail with reference to FIG. FIG. 2 is a view schematically showing the drain plug 30A. The drain plug 30A includes an outer tank plug 31A, an inner tank plug 32A, a spring (corresponding to an elastic member in claims) 33A, and a ball (corresponding to a connection portion in claims) 34. Has been. The outer tank plug 31A is configured as a drain bolt that seals the outer tank drain hole M1 by being tightened into the outer tank drain hole M1. The inner tank plug 32A has a magnet on the top. However, the present invention is not limited to this. For example, the material of the inner tank plug 32A is iron, and the sub oil pan 5A is provided with a magnet around the inner tank drain hole M2 instead of the inner tank plug 32A. A magnet may be provided so that both 32A and the sub oil pan 5A attract each other. The entire inner tank plug 32A may be a magnet. The magnet fixes the inner tank plug 32A in contact with the inner tank drain hole M2 by magnetic force.

  One end of the spring 33A is connected to the lower surface of the inner tank plug 32A. The other end of the spring 33A is connected to the outer tank plug 31A via a ball 34. The ball 34 is slidably incorporated in the upper part of the outer tank plug 31A, and a part (less than half) of the ball 34 is exposed from the upper surface of the outer tank plug 31A. Specifically, the other end of the spring 33A is connected to a portion of the ball 34 exposed from the outer tank plug 31 in this way. Thus, the spring 33A is arranged between the outer tank plug 31A and the inner tank plug 32A, and the ball 34 rotatably connects the outer tank plug 31A to the inner tank plug 32A. A so-called ball joint is formed at a connection point between the spring 33A and the outer tank plug 31A.

  FIG. 3 is a diagram schematically showing a state when the drain plug 30A is mounted on the two-tank oil pan 20A. FIG. 3A is a stage in the middle of tightening the outer tank plug 31A into the outer tank drain hole M1, and the inner tank plug 32A is connected to the inner tank drain hole M2 (more specifically, for the inner tank). The state before contacting the lower end portion of the drain hole M2 is shown. By further tightening the outer tank plug 31A from this state, as shown in FIG. 3B, the inner tank plug 32 closes the inner tank drain hole M2 so as to close the inner tank drain hole M2. Abut. At this time, the inner tank plug 32A is attracted to the iron sub oil pan 5A by magnetic force and is fixed by magnetic force, so that the inner tank drain hole M2 is more reliably sealed.

  When the outer tank plug 31A is further tightened from the state shown in FIG. 3 (b), the outer tank plug 31A is seated on the main oil pan 3A as shown in FIG. 3 (c). Thereby, the drain hole M1 for outer tanks is sealed. During this time, the ball 34 makes the outer tank plug 31A rotatable with respect to the inner tank plug 32A, so that the inner tank plug 32A fixed by magnetic force is prevented from rotating. As a result, workability can be prevented from being deteriorated and a load in the rotational direction can be prevented from being applied to the spring 33A. On the other hand, when the spring 33A is shortened to be larger than the free length during this period, the shortened spring 33A presses the inner tank plug 32A against the inner tank drain hole M2, and this also seals the inner tank drain hole M2. Sexuality is enhanced. In addition, since the work for exchanging oil is the work for removing the drain plug 30A from the drain hole M1 for the outer tub, the workability of exchanging oil can be ensured. Furthermore, according to the drain plug 30A, even if the gap between the bottom surface of the inner tub 6 and the strainer 13 is small (for example, about 8 mm), it can be used without being affected by this.

  The drain plug 30A can be variously modified. FIG. 4 is a diagram schematically showing a drain plug 30B which is a modification of the drain plug 30A. The drain plug 30A may be, for example, a drain plug 30B provided with a disk-shaped connection member 35 instead of the ball 34 as a connection portion. In this way, it is possible to suitably prevent the upright spring 33A from being excessively tilted to the extent that it can absorb the misalignment generated between the outer tank drain hole M1 and the inner tank drain hole M2. However, the present invention is not limited to this, and the spring 33A may be regulated so as not to fall excessively by other appropriate means. Further, it is preferable that the spring 33 </ b> A has rigidity enough to prevent the spring 33 </ b> A itself from being bent and deformed excessively. However, the present invention is not limited to this, and for example, the outer tank plug 31A may be provided with a guide for restricting unnecessary movement of the inner tank plug 32A.

  Also, instead of the outer tank plug 31A being provided with a guide for restricting unnecessary movement of the inner tank plug 32A, the sub oil pan 5A is provided with a guide for restricting unnecessary movement of the inner tank plug 32A. Also good. FIG. 5 is a diagram schematically showing a two-tank oil pan 20B provided with a sub oil pan 5B together with a drain plug 30A. The two-tank oil pan 20B includes a sub-oil pan 5B instead of the sub-oil pan 5A, and the sub-oil pan 5B includes a guide portion 15 for restricting the movement of the inner tank plug 32A. The guide portion 15 corresponds to the guide means in the present invention, and is formed of a hollow conical member formed in a tapered shape that extends downward from the periphery of the lower end portion of the drain hole M2 for the inner tank. The inner diameter of the upper end portion is formed larger than the outer diameter of the inner tank plug 32A. The guide portion 15 restricts unnecessary movement of the inner tank plug 32A that may occur while the outer tank plug 31A is tightened, and the inner tank plug 32A is accurately moved to the lower side of the inner tank drain hole. Induce.

  Further, for example, the following drain plug 30C may be employed instead of the drain plug 30A. FIG. 6 is a view schematically showing a drain plug 30C together with a two-tank oil pan 20C as a modification of the drain plug 30A. The drain plug 30C includes an outer tank plug 31C, an inner tank plug 32C, and a spring 33C. 31 C of outer tank plugs have the cylindrical cavity part H opened toward the upper surface inside. Further, the outer tub plug 31C includes an engaging portion K for preventing the inner tub plug 32C from popping out around the opening of the hollow portion H. The engaging portion K engages with the stepped portion D of the inner tank plug 32C.

  The inner tank plug 32C includes a contact portion T, a main body portion B, and a stepped portion D. The contact portion T is formed in a hemispherical shape, and contacts the inner tank drain hole M2. The height of the stepped portion D is set smaller than the height of the hollow portion H, and the stepped portion D is always accommodated in the hollow portion H. The main body part B and the stepped part D are both formed in a cylindrical shape, and the outer diameter of the main body part B is set smaller than the inner diameter of the engaging part K. On the other hand, the outer diameter of the stepped portion D is set larger than the outer diameter of the main body portion B, and is set smaller than the inner diameter of the hollow portion H. Further, the outer diameter of the main body B and the outer diameter of the stepped portion D are set so as to have a larger clearance between the engaging portion K and the hollow portion H, respectively. As a result, the inner tank plug 32C has a certain degree of freedom in the radial direction with respect to the outer tank plug 31C, and absorbs misalignment that occurs between the outer tank drain hole M1 and the inner tank drain hole M2. become able to. In the drain plug 30C, the engaging portion K, the hollow portion H, and the stepped portion D function as a connecting portion that rotatably connects the outer tank plug 31C and the inner tank plug 32C. The inner tank plug 32C may have a configuration in which a magnet is provided in the contact portion T.

  A spring 33C is accommodated in the cavity H. The spring 33C is disposed in the cavity H between the outer tank plug 31C and the inner tank plug 32C, and urges the inner tank plug 32C upward. As the outer tank plug 31C is tightened, the inner tank plug 32C comes into contact with the inner tank drain hole M2, and when the outer tank plug 31C is further tightened, the spring 33C is shortened. Thereafter, when the outer tank plug 31C is seated and the outer tank drain hole M1 is sealed, the spring 33C shortened to be larger than the free length presses the inner tank plug 32C against the inner tank drain hole M2 with a strong force. On the other hand, of the inner tank drain hole M2 formed in the sub oil pan 5C, the portion with which the inner tank plug 32C abuts is formed in a tapered shape that expands downward.

  For this reason, even when the misalignment occurs between the drain hole M1 for the outer tank and the drain hole M2 for the inner tank, the drain hole M2 for the inner tank can be appropriately sealed with the plug 32C for the inner tank. Moreover, since the contact part T of the inner tank plug 32C and the inner tank drain hole M2 are in line contact with each other, the sealing performance of the inner tank drain hole M2 is improved. Furthermore, since the hollow portion H and the engaging portion K also function as a guide for the inner tank plug 32C, unnecessary movement of the inner tank plug 32C is also restricted. On the other hand, since the operation at the time of oil replacement is the operation of detaching the drain plug 20C from the drain hole M1 for the outer tank, the workability of oil replacement can be ensured.

  In order to provide the outer tank drain hole M1 in the main oil pan 3, it is generally provided with a retainer 36 in which the outer tank drain hole M1 is formed as shown in FIG. Specifically, the outer tank plug 31 is generally tightened after a gasket 37 is mounted on the seat surface. As described above, the drain plugs 30A, 30B, and 30C can appropriately seal the drain hole M2 for the inner tank and the drain hole M1 for the outer tank, and also ensure the workability of oil exchange.

  FIG. 7 is an explanatory view showing the drain structure 50 of the two-tank oil pan as a cross section. The drain structure 50 of the two-tank oil pan includes a two-tank oil pan 20D comprising a main oil pan 3D and a sub oil pan 5D, an outer tank plug 31D, an inner tank plug 32D, and a first rod-like member. 38 and a second bar-shaped member 39. The main oil pan 3D is provided with an outer tank drain hole M1, and the sub oil pan 5D is provided with an inner tank drain hole M2. In the drain structure 50 of the two-tank oil pan, the outer tank drain hole M1 and the inner tank drain hole M2 do not have to be arranged substantially coaxially with each other. Therefore, the outer tank drain hole M1 and the inner tank drain hole M2 Are not arranged substantially coaxially. The lower part of the inner tank drain hole M2 with which the inner tank plug 32D abuts is formed in a tapered shape that expands downward.

  The outer tank plug 31D is configured as a drain bolt that seals the outer tank drain hole M1 by being tightened into the outer tank drain hole M1. The inner tank plug 32D is disposed in the outer tank 7 of the two-tank oil pan 20D and below the inner tank drain hole M2. The inner tank plug 32D is a float type inner tank plug, and is configured to generate buoyancy in the engine oil. In order to generate buoyancy in the engine oil, for example, a cavity storing air is provided in the inner tank plug 32D, or a material having a lighter specific gravity than the engine oil is used for the inner tank plug 32D. Can be realized. It is preferable to use a resin such as rubber as the material of the inner tank plug 32D.

  Of the inner tank plug 32D, the upper surface portion in contact with the inner tank drain hole M2 is hemispherical. A female screw is formed at the top of the hemisphere, and a first rod-like member 38 is fastened to the female screw via an inner tank drain hole M2. Further, the first bar-shaped member 38 is connected to the second bar-shaped member 39 in the inner tank 6 substantially perpendicularly. The upper end of the first bar-shaped member 38 is fixed to the approximate center of the second bar-shaped member 39. The second rod-shaped member 39 extends longer than the diameter of the inner tank drain hole M2. The 1st and 2nd rod-shaped members 38 and 39 comprised in this way comprise the latching means to the drain hole M2 for inner tanks in this invention. The rod-shaped members 38 and 39 further function as position regulating members and regulate the inner tank plug 32D so as to be positioned below the inner tank drain hole M2. In addition, according to the 1st and 2nd rod-shaped members 38 and 39, even when the clearance gap between the bottom face of the inner tank 6 and the strainer 13 is small (for example, about 8 mm), it can be comprised enough. It is. That is, if it is going to employ | adopt the float valve which has arrange | positioned the float in the inner tank 6, it will be thought that a float interferes with a strainer and the arrangement | positioning becomes difficult. In particular, when trying to improve the sealing performance of the drain hole M2 for the inner tank, it may be possible to obtain a large buoyancy by enlarging the float, but it is increasingly difficult to adopt the larger float due to interference with the strainer. It is thought that it becomes. In that respect, the inner tank plug 32D of this embodiment can avoid interference with the strainer 13.

  FIG. 8 is a diagram schematically illustrating the drain structure 50 of the two-tank oil pan in a normal state and a state at the time of oil replacement. As shown in FIG. 8A, oil is stored in the inner tank 6 and the outer tank 7 of the two-tank oil pan 20D at normal times. For this reason, the inner tank plug 32D floats and comes into contact with the inner tank drain hole M2. At this time, since the hemispherical portion of the inner tank plug 32D is in line contact with the tapered portion of the inner tank drain hole M2, the inner tank drain hole M2 can be appropriately sealed by buoyancy. On the other hand, as shown in FIG. 8B, the level of the engine oil in the outer tub 7 is lowered by removing the outer tub plug 31D at the time of oil replacement, so the inner tub plug 32D is connected to the inner tub drain hole M2. Get away from. Thus, the engine oil can be extracted not only from the outer tank 7 but also from the inner tank 6 only by removing the outer tank plug 31D. As described above, the drain structure 50 of the two-tank oil pan can appropriately seal the drain hole M2 for the inner tank and the drain hole M1 for the outer tank, and can ensure the workability of oil exchange.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

It is explanatory drawing which showed the oil pan structure 1A comprised including the two tank type oil pan 20A as a cross section. It is a figure which shows drain plug 30A typically. It is a figure which shows typically a mode when attaching drain plug 30A to the two tank oil pan 20A. It is a figure showing typically drain plug 30B which is a modification of drain plug 30A. It is a figure which shows typically the 2 tank type oil pan 20B provided with the sub oil pan 5B with the drain plug 30A. As a modified example of the drain plug 30A, a drain plug 30C is schematically shown together with a two-tank oil pan 20C. It is explanatory drawing which showed the drain structure 50 of the two tank type oil pan as a cross section. It is a figure which shows typically the state at the time of normal time, and the state at the time of oil replacement | exchange of the drain structure 50 of a two tank type oil pan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil pan structure 3 Main oil pan 5 Sub oil pan 6 Inner tank 7 Outer tank 15 Guide part 20 Two tank type oil pan 30 Drain plug 31 Outer tank plug 32 Inner tank plug 33 Spring 34 Ball 35 Connection member 36 Retainer 37 Gasket 38 First rod member 39 Second rod member 50 Drain structure of two-tank oil pan

Claims (5)

An inner tank plug that seals the drain hole for the inner tank by contacting the drain hole for the inner tank of the two-tank oil pan from below;
An outer tank plug that seals the drain hole for the outer tank of the two-tank oil pan;
The inner tank plug is disposed between the inner tank plug and the outer tank plug, the inner tank plug abuts on the inner tank drain hole, and the outer tank plug has the outer tank drain hole. An elastic member that shortens in a sealed state ;
A drain plug for a two-tank oil pan, comprising a magnet for fixing the inner tank plug in contact with the inner tank drain hole with a magnetic force. An inner tank plug that seals the drain hole for the inner tank by contacting the drain hole for the inner tank of the two-tank oil pan from below;
An outer tank plug that seals the drain hole for the outer tank of the two-tank oil pan;
The inner tank plug is disposed between the inner tank plug and the outer tank plug, the inner tank plug abuts on the inner tank drain hole, and the outer tank plug has the outer tank drain hole. An elastic member that shortens in a sealed state ;
With
By being tightened into the drain hole for the outer tank, a drain bolt for sealing the drain hole for the outer tank is provided as the plug for the outer tank,
Furthermore, the drain plug of the two tank type oil pan provided with the connection part which connects the said plug for outer tanks rotatably with respect to the said plug for inner tanks. In the drain plug of the two-tank oil pan according to claim 2 ,
A drain plug for a two-tank oil pan, comprising a magnet for fixing the inner tank plug in contact with the inner tank drain hole with a magnetic force. In the drain plug of the two-tank type oil pan according to any one of claims 1 to 3 ,
The two-tank oil pan drain, wherein the inner tank plug and the outer tank plug seal the inner tank drain hole and the outer tank drain hole arranged substantially coaxially, respectively. plug. An inner tank plug that seals the drain hole for the inner tank by contacting the drain hole for the inner tank of the two-tank oil pan from below;
An outer tank plug that seals the drain hole for the outer tank of the two-tank oil pan;
The inner tank plug is disposed between the inner tank plug and the outer tank plug, the inner tank plug abuts on the inner tank drain hole, and the outer tank plug has the outer tank drain hole. An elastic member that shortens in a sealed state;
Guiding means for guiding the inner tank plug into the inner tank drain hole;
A two-tank oil pan drain structure characterized by comprising:

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