JP2006132409A - Machine and engine with oil pan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine with an oil pan capable of completing warming up operation more quickly. <P>SOLUTION: An oil pan separator 40 made of synthetic resin having larger specific heat than metal is arranged to partition a space in the oil pan 30 into a first chamber A and a second chamber B outside thereof. The oil pan separator 40 has a balance shaft cover 40c covering a metal made balance shaft 27 from an upper part and a cylinder block skirt cover 40k covering an inner wall surface of the metal made skirt part 20b formed as one unit. Consequently, oil supplied to the piston 21 or the like during warming up operation and absorbing heat is prevented from being cooled by touching the skirt part 20b and the balance shaft 27 in a middle of recirculation to the first chamber A and can be recirculated to the first chamber A under a relatively high temperature condition. Consequently, warming up operation time shortening effect by a dual tank type oil pan can be kept good. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a machine with an oil pan such as an engine or an automatic transmission.

  2. Description of the Related Art Conventionally, a machine with an oil pan (such as an engine or an automatic transmission) provided with an oil pan capable of storing oil for lubricating a member to be lubricated (gear, piston, etc.) is widely known (for example, Patent Document 1). . Generally, in this machine with an oil pan, the oil stored in the oil pan is sucked out by an oil pump and supplied to a member to be lubricated. The oil exhibits a lubricating action in the member to be lubricated and absorbs heat such as frictional heat generated in the member to be lubricated, and then falls by gravity and returns to the oil pan.

  Conventionally, a so-called two-tank oil pan structure is widely known as an oil pan structure for shortening the warm-up operation time (for example, Patent Document 2). In this two-tank type oil pan, an inner wall (oil pan separator) that divides the space inside the outer wall into two tanks is provided inside the outer wall (oil pan).

In the two-tank oil pan, during the warm-up operation, circulation of the oil stored in the space between the inner wall and the outer wall is limited, and the oil stored inside the inner wall is mainly used. It is configured to circulate in the engine. Accordingly, during the warm-up operation, the amount of oil circulation is reduced, so that the temperature of the oil (and the member to be lubricated) can quickly rise, and the warm-up operation time can be shortened.
JP 2003-176754 A JP 2004-218582 A

  In a conventional machine with an oil pan as described in Patent Document 1, an inner wall surface (hereinafter referred to as an “inner wall surface”) of a metal cylinder block in the middle of oil flowing back from the lubricated member toward the oil pan. And the entire surface of a member such as a crankshaft (hereinafter also referred to as “member surface”) is exposed, and oil is directly applied to the inner wall surface or the member surface. It was in a state where it could come into contact.

  The temperature of the inner wall surface and the member surface is low during the warm-up operation. When the high-temperature oil that has absorbed heat from the lubricated member is in direct contact with the inner wall surface or member surface, which is a metal surface having a low temperature, the temperature of the contacting inner wall surface or member surface and the oil The difference is very large. Further, members such as metal cylinder blocks and crankshafts (hereinafter referred to as “cylinder blocks”) have a very high thermal conductivity. Therefore, the heat stored in the oil is transmitted to the inner wall surface and member surface on the low temperature side, and further rapidly moves to the inside of the cylinder block and the like on the low temperature side.

  As a result, the temperature gradient inside the cylinder block or the like is quickly flattened, so that the inner wall surface and the member surface cannot rapidly rise in temperature during the warm-up operation and remain at a low temperature. In addition, the oil is deprived of heat and rapidly drops in temperature, and then returns to the oil pan.

  When the oil comes into contact with the low temperature inner wall surface or member surface again, the temperature difference between the oil and the inner wall surface or member surface remains large. Heat is rapidly absorbed by the cylinder block or the like through the member surface, rapidly cooled and returned to the oil pan.

  Thus, in the conventional machine with an oil pan, the rapid temperature rise of the oil (and the member to be lubricated) during the warm-up operation is prevented. In particular, in the so-called two-tank oil pan described in Patent Document 2, the effect of shortening the warm-up operation time has been reduced.

Means for Solving the Problems and Effects of the Invention

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a machine and an engine with an oil pan that can complete warm-up operation more quickly.

  In order to achieve such an object, a feature of the present invention is that a machine with an oil pan covers a specific member with which the oil can come into contact with the oil in the middle of the oil flowing back from the lubricated member toward the oil pan. And a cover for suppressing contact with the specific member. The cover is made of a material having a lower thermal conductivity than the specific member.

  That is, in the machine with an oil pan of the present invention, the oil pan is connected to a housing that houses a member to be lubricated by oil. The oil pan stores the oil supplied to the lubricated member, and is configured to store the oil supplied to the lubricated member and returned from the lubricated member.

  Furthermore, a specific member that can be contacted with the oil while the oil is recirculated from the lubricated member toward the oil pan is covered with a cover for suppressing the contact of the oil. This cover is made of a material having a lower thermal conductivity than the specific member. Specifically, for example, the specific member is made of a material having high thermal conductivity such as metal or ceramics, and the cover is made of synthetic resin or the like.

  In such a configuration, a case is considered in which oil that has become hot due to absorption of heat from the lubricated member during warm-up operation comes into contact with the surface of the cover that is cooler than the temperature of the oil.

  In this case, when hot oil contacts the surface of the cover, the surface of the cover receives heat transfer from the oil. Here, since the cover is made of a material having low thermal conductivity, the heat transferred from the oil to the surface of the cover is not rapidly transferred into the cover. Therefore, the temperature gradient inside the cover is not easily flattened. That is, the surface temperature of the cover is likely to rise. Thereby, the temperature difference between the surface of the cover and the oil is quickly reduced. Accordingly, it is possible to suppress the heat held by the oil from being taken away through the surface of the cover (the oil is cooled) and the temperature of the oil rapidly decreasing.

  As a result, during warm-up operation, the amount of heat taken away from the oil during the return from the lubricated member to the oil pan is less than in the prior art configuration without the cover. Therefore, the oil that is supplied to the lubricated member and absorbs heat such as frictional heat from the lubricated member can return to the oil pan at a higher temperature than before, and the oil is again supplied from the oil pan to the lubricated member. Can be supplied towards.

  As described above, according to the present invention, the temperature of the oil (and the lubricated member) during the warming-up operation can be quickly increased, so that the warming-up operation can be completed more quickly than in the prior art.

  Another feature of the present invention is that the space inside the oil pan is divided into a first chamber opening toward the lubricated member and a second chamber adjacent to the first chamber. An oil pan separator provided in the inner space is provided, and the cover is configured integrally with the oil pan separator.

  According to such a configuration, in the so-called two-tank oil pan structure for shortening the warm-up operation time, it is possible to further shorten the warm-up operation time than the conventional technique by further including the cover. The effect of becoming. Further, by integrally configuring the cover and the oil pan separator (preferably integrally formed without seams), it is possible to reduce the manufacturing cost of the two-tank oil pan structure.

  Another feature of the present invention is that a housing cover as the cover is provided to cover an inner wall surface at a lower end portion of the housing as the specific member.

  According to this configuration, the oil supplied to the lubricated member and absorbing heat such as frictional heat from the lubricated member can directly contact the inner wall surface at the lower end portion of the housing made of a material having high thermal conductivity. While being suppressed, the oil flows back to the oil pan while coming into contact with the housing cover made of a material having a lower thermal conductivity than the material constituting the lower end of the housing. Therefore, the amount of heat taken away by the oil at the lower end portion of the housing is reduced as compared with the conventional case. Therefore, there is an effect that the warm-up operation can be completed more quickly than in the past.

  Another feature of the present invention is that a balance shaft cover that covers a balance shaft disposed below the crankshaft from above is provided as the cover. In the configuration of the present invention, the balance shaft is disposed below the crankshaft and is coupled to the crankshaft by a gear or the like. The balance shaft usually rotates at the same or twice the rotational speed as the crankshaft and synchronizes with the crankshaft so that the vibration generated by the rotation of the crankshaft is canceled as much as possible. It is configured to generate vibration.

  Here, in the configuration of the present invention, the balance shaft made of a material having a high thermal conductivity is covered with a balance shaft cover made of a material having a lower thermal conductivity than that of the balance shaft. According to such a configuration, it is possible to suppress the oil that attempts to return to the oil pan from coming into contact with the balance shaft.

  The balance shaft cover is preferably provided so as to be interposed between the crankshaft and the balance shaft. According to such a configuration, the oil supplied to the crankshaft that is the member to be lubricated is prevented from directly contacting the balance shaft in the course of returning from the crankshaft to the oil pan.

  Here, the balance shaft cover is provided with a through hole, and the through hole is formed so that there is no balance shaft vertically below the through hole (in other words, the vertical of the through hole is vertical). It is preferable that the projection below is formed so as not to overlap the balance shaft. In such a configuration, a large amount of oil is suppressed from being accumulated on the upper side of the balance shaft cover by returning the oil to the oil pan through the through hole. Further, the oil that has passed through the through hole can be prevented from coming into contact with the balance shaft.

  According to the above-described configuration, it is possible to suppress the heat stored in the oil from being taken away by the balance shaft when returning to the oil pan.

  In addition, it is possible to suppress a large amount of oil from adhering to the balance shaft, and thereby it is possible to suppress an increase in rotational resistance of the balance shaft.

  In addition, since oil is prevented from splashing from the balance shaft that rotates at high speed, the oil is cooled to such an extent that the progress of the warm-up operation is hindered by the splashing of the oil, or bubbles are mixed into the oil in the oil pan. There is an effect that it can be suppressed.

  Another feature of the present invention is that a crankshaft cover covering the crankshaft is provided as the cover. That is, the crankshaft is covered with the crankshaft cover from above (and from the side).

  According to such a configuration, it is possible to suppress the oil that attempts to return to the oil pan from coming into contact with the crankshaft. Thereby, it is possible to suppress the heat stored in the oil from being taken away by the crankshaft when returning to the oil pan. Further, it is possible to suppress a large amount of oil from adhering to the crankshaft, thereby suppressing an increase in rotational resistance of the crankshaft.

  Another feature of the present invention is that the engine has a crankshaft cover made of a material having a lower thermal conductivity than the material constituting the crankshaft, and a material having a lower thermal conductivity than the material constituting the cylinder block. A cylinder block skirt cover, and a balance shaft cover made of a material having a thermal conductivity lower than that of the material constituting the balance shaft, the cylinder block skirt cover and the balance shaft cover being an oil pan separator. It is formed integrally.

  That is, in the engine of the present invention, the piston and the crankshaft are accommodated in the cylinder block. An oil pan capable of storing oil is connected to the cylinder block. A balance shaft and an oil pan separator are disposed in a space surrounded by the cylinder block and the oil pan. The balance shaft is disposed below the crankshaft. The oil pan separator is provided so as to divide the space inside the oil pan into a first chamber that opens toward the cylinder block and a second chamber adjacent to the first chamber. During the warm-up operation, the exchange of oil between the first chamber and the second chamber is restricted.

  The crankshaft is covered with a crankshaft cover from above. The inner wall surface at the lower end of the cylinder block is covered with a cylinder block skirt cover formed integrally with the oil pan separator.

  Further, the balance shaft is covered with a balance shaft cover formed integrally with the oil pan separator from above.

  According to such a configuration, the oil that has been supplied to the piston and absorbed heat returns to the first chamber of the oil pan. In the middle of this oil recirculation, there are members made of a material having high thermal conductivity, such as the lower end portion of the cylinder block, the crankshaft, and the balance shaft. However, these members are covered with a cover (cylinder block skirt cover, crankshaft cover, balance shaft cover) made of a material having a lower thermal conductivity than the member. Therefore, the oil is mainly restrained from coming into direct contact with each of the above-described members, and returns to the first chamber of the oil pan through each cover. Further, the oil supplied to the crankshaft is also prevented from coming into direct contact with the balance shaft, and returns to the first chamber of the oil pan through the balance shaft cover.

  Therefore, according to the engine of this invention, there exists an effect that warm-up operation can be completed more rapidly like the above-mentioned machine with an oil pan of this invention. In addition, the rotational resistance of the crankshaft and balance shaft can be reduced. Furthermore, there is an effect that oil scattering due to rotation of the crankshaft and the balance shaft can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention (embodiments that the applicant currently considers best at the time of filing of the present application) will be described with reference to the drawings.

(Configuration of the embodiment)
FIG. 1 is a side sectional view showing a schematic configuration of an in-line four-cylinder engine 10 according to an embodiment of the present invention. The engine 10 includes a cylinder block 20, an oil pan 30, and an oil pan separator 40. In FIG. 1, illustration of a cylinder head cover, a cylinder head, and the like is omitted.

  The cylinder block 20 is made of metal. A cylinder 20a is formed in the cylinder block 20, and a piston 21 as a lubricated member is accommodated in the cylinder 20a.

  A metal crankshaft 23 is disposed inside the skirt portion 20b, which is the lower end portion of the cylinder block 20. That is, a journal bearing portion 20c extends from the cylinder block 20 inside the skirt portion 20b, and a crank cap 20d is fixed to the lower end portion of the journal bearing portion 20c with a bolt. The crankshaft 23 is rotatably supported while the crank journal 23a constituting the rotation center axis is sandwiched between the journal bearing portion 20c and the crank cap 20d.

  The crankshaft 23 is provided with four sets of crank arms 23 b corresponding to the four pistons 21. Each corresponding crank arm 23 b and piston 21 are connected by a connecting rod 25.

  A metal balance shaft 27 is rotatably disposed below the crankshaft 23. The balance shaft 27 is provided with a driven gear 27a. When the driven gear 27a meshes with a drive gear 23c provided on the crankshaft 23, the balance shaft 27 rotates in synchronization with the rotation of the crankshaft 23. It has become.

  The oil pan 30 is a bathtub-shaped member formed by pressing a steel plate, and is configured to be able to store oil in a space inside thereof. A flange portion 30 a for connecting the cylinder block 20 and the oil pan 30 is formed at the end edge portion of the oil pan 30.

  The oil pan separator 40 is made of a synthetic resin plate having a thermal conductivity lower than that of metal. A recess 40 a that opens upward is formed at the bottom of the oil pan separator 40. In addition, the oil pan separator 40 is disposed so that the recess 40 a is positioned in the inner space of the oil pan 30 with a predetermined gap from the bottom 30 b of the oil pan 30.

  The inner space of the oil pan 30 includes a first chamber A composed of a space inside the recess 40 a, a space outside the first chamber A, that is, an outer wall surface of the oil pan separator 40 and an inner wall surface of the oil pan 30. Are divided by an oil pan separator 40 into a second chamber B composed of a space surrounded by.

  Many communication holes 40b are formed in the side surface in the bottom part of the recessed part 40a. The communication hole 40b has a diameter of about 2 mm so that passage of oil with high viscosity at a low temperature before the end of warm-up operation is difficult, while passage of oil with low viscosity at high temperature after the end of warm-up operation is facilitated. It is comprised from this circular through-hole.

  The oil pan separator 40 includes a balance shaft cover 40c that covers the balance shaft 27 from above, and a balance shaft under cover 40d that covers the balance shaft 27 from below.

  The balance shaft cover 40c receives oil that has fallen from above the balance shaft 27 (for example, oil that has fallen from the crankshaft 23 after being supplied to the bearing portion of the crankshaft 23 for lubrication of the crankshaft 23). It is a cover for covering the main body portion of the balance shaft 27 so as not to contact the main body portion of the balance shaft 27 (portion other than the driven gear 27a). The balance shaft cover 40 c is disposed so as to be interposed between the crankshaft 23 and the balance shaft 27.

  Further, as shown in FIG. 2 which is an enlarged view of the balance shaft cover 40c, the balance shaft cover 40c has an upper portion in which the both end portions are the lowest and the center portion is higher in the width direction (the depth direction in the perspective view of FIG. 2). That is, it is formed in a convex shape in the direction toward the crankshaft 23. Further, the balance shaft cover 40c is formed so that the convex apex becomes higher as it is closer to the driven gear 27a, and a root portion (a connection portion with an oil receiving portion 40g described later having a substantially flat plate shape in FIG. 1). (Shown by the middle two-dot chain line) is a substantially flat plate having the same height as the both end portions.

  A plurality of oil return holes 40e are formed at both end portions and base portions in the width direction, which is the lowest position in the balance shaft cover 40c. This prevents oil from accumulating on the upper side of the balance shaft cover 40c. That is, the oil that has fallen from above and has contacted the balance shaft cover 40c flows down the slope formed on the balance shaft cover 40c and moves onto the balance shaft under cover 40d through the oil return hole 40e. Yes.

  Here, the oil return hole 40e is such that the oil that has passed through the oil return hole 40e does not reach the balance shaft 27 (the balance shaft 27 does not exist vertically below the oil return hole 40e: that is, the oil return hole 40e is formed in a position / shape so that the projection of 40e vertically below does not overlap the balance shaft 27.

  Referring again to FIG. 1, the balance shaft under cover 40 d covers the balance shaft 27 from below so that the oil inside the first chamber A is not splashed onto the balance shaft 27, and the inside of the first chamber A It can function as a baffle plate to prevent large waves from being generated in the oil. An oil return hole 40f for returning the oil on the balance shaft under cover 40d to the first chamber A is formed at the lowest position in the balance shaft under cover 40d.

  A substantially flat oil receiving portion 40g is provided below the crankshaft 23 at a position where the recess 40a and the balance shaft cover 40c are not formed in plan view. One end portion of the oil receiving portion 40g is connected to the base portion of the balance shaft cover 40c. The oil receiving portion 40g receives oil dropped from above on the upper surface of the oil receiving portion 40g, and passes through the oil return hole 40e. The oil is moved onto the balance shaft under cover 40d.

  A flange portion 40 h for connecting the oil pan separator 40 to the cylinder block 20 is formed at an edge portion of the oil pan separator 40 in plan view. A cylinder block skirt cover 40k is erected upward from an inner edge portion of the flange portion 40h. The cylinder block skirt cover 40k is configured to cover the inner wall surface by contacting the outer wall surface of the cylinder block skirt cover 40k with the inner wall surface of the skirt portion 20b which is the lower end portion of the cylinder block 20.

  The oil pan separator 40 including the concave portion 40a, the balance shaft cover 40c, the balance shaft under cover 40d, the oil receiving portion 40g, the flange portion 40h, and the cylinder block skirt cover 40k is integrally formed by injection molding a synthetic resin. It is molded in one piece.

  The oil pan 30 and the oil pan separator 40 having the above-described configuration are fixed so that the flange portions 30a and 40h are fixed to the skirt portion 20b of the cylinder block 20 with bolts or the like while the oil pan separator 40 is overlaid. As a result, the cylinder block 20 is connected.

  A strainer 51 is arranged inside the first chamber A. The strainer 51 is connected to an oil pump (not shown). That is, the strainer 51 constitutes an oil suction port in the first chamber A, and the oil sucked by the strainer 51 is pistoned as a member to be lubricated, the crankshaft 23, etc. by the oil pump ( More precisely, it is supplied to the sliding portion of the piston 21 between the piston ring 21a and the cylinder 20a, the bearing portion of the crankshaft 23, that is, the sliding portion of the crankshaft 23 to the journal bearing portion 20c and the crank cap 20d). It has come to be.

(Operation of the embodiment)
Subsequently, the operation of the present embodiment having the above-described configuration will be described.

  When the operation of the engine 10 is started, an oil pump (not shown) is driven based on the cycle motion of the internal combustion engine. The oil pump sucks oil stored in the first chamber A from the strainer 51 and directs the sucked oil toward each lubricated member such as the piston 21 and the crankshaft 23 in the cylinder block 20. Send it out. As a result, the oil supplied to each lubricated member functions as lubricating oil in each lubricated member, and absorbs heat such as frictional heat generated during operation of each lubricated member, and then is lowered by gravity. To return to the first chamber A.

  During the warm-up operation, the oil temperature is low, so the oil viscosity is high. Therefore, as described above, it is difficult for the oil during the warm-up operation to pass through the communication hole 40b having a small hole diameter. As a result, during the warm-up operation, the exchange of oil between the first chamber A and the second chamber B is limited. Therefore, even if a negative pressure for sucking oil is generated in the strainer 51, the negative pressure hardly causes oil to flow from the second chamber B to the first chamber A through the communication hole 40b. That is, during the warm-up operation, the oil supplied to the piston 21 that is the member to be lubricated is almost limited to the oil in the first chamber A. Accordingly, the progress of the warm-up operation can be promoted.

  Here, in the middle of the return of oil from the piston 21 or the crankshaft 23 that is the supply destination (lubricated member) to the first chamber A that is the storage source, the skirt portion 20b that is the lower end of the cylinder block 20 or the balance shaft 27 exists. As described above, the skirt portion 20b and the balance shaft 27 are made of a metal having high thermal conductivity. However, these members are covered with a cylinder block skirt cover 40k and a balance shaft cover 40c made of synthetic resin having low thermal conductivity. As a result, the oil can be effectively suppressed from directly contacting the metal skirt portion 20b and the balance shaft 27.

  Therefore, the heat absorbed by the lubricated member such as the piston 21 by the oil is absorbed by the cylinder block 20 (skirt portion 20b) and the balance shaft 27 in the middle of the reflux of the oil toward the first chamber A. Is effectively suppressed. Therefore, the progress of the warm-up operation is hindered by the heat of the oil being taken away by a member having high thermal conductivity such as the cylinder block 20 (skirt portion 20b) existing in the middle of the reflux of the oil toward the first chamber A. This can be effectively suppressed.

  Further, the balance shaft cover 40c prevents a large amount of oil from adhering to the main body portion of the balance shaft 27 to increase the rotational resistance of the balance shaft 27.

(Suggestion of modification)
Note that, as described above, the above embodiment is merely an example of the embodiment of the present invention that the applicant considered to be the best at the time of filing of the present application. The present invention is not limited to the embodiments, and various modifications can be made without departing from the essential part of the present invention. Hereinafter, although some modifications will be exemplified, it goes without saying that the modifications are not limited to the following.

  For example, the configuration of the oil pan and the lubricating device of the present invention can be applied to various devices including a lubricating device to which the oil pan is applied, such as an automatic transmission, in addition to the engine as in each of the above embodiments. is there.

  Further, instead of the communication hole 40b, a thermostat valve device whose valve opening rate varies depending on the temperature of the oil may be used. This thermostat valve device is provided with a known wax type thermostat valve used in a cooling water circulation system of an automobile, etc., inside the case, and when the temperature exceeds a predetermined valve opening temperature, the case of the thermostat valve device The oil is exchanged between the first chamber A and the second chamber B through the inside.

  Furthermore, a crankshaft cover 61 that covers the crankshaft 23 may be provided as in the engine 110 of the modification shown in FIG. 3 (in FIG. 3, members having the same functions and functions as those in FIG. 1). Are given the same reference numerals as in FIG. 1 and the description thereof is incorporated in the above description.) As shown in FIG. 4, the crankshaft cover 61 includes a cover portion 61a that covers a crank arm (crank arm 23b in FIG. 1) in the crankshaft 23, and a lower portion of the cover portion 61a. The crankshaft cover 61 is composed of a flange portion 61 b for connecting the crankshaft cover 61 to the cylinder block 20.

  In the engine 110 having such a configuration, for example, a cylinder head cover (not shown) and a cam shaft that is a member to be lubricated accommodated in the cylinder head, a piston 21 that is a member to be lubricated located above the cylinder block 20, and the like are supplied. The oil moves downward from the lubricated member by gravity. In the oil recirculation path until the oil recirculates from the lubricated member to the first chamber A, there is a metal crankshaft 23 in addition to the skirt portion 20b that is the lower end portion of the cylinder block 20 and the balance shaft 27. is doing.

  However, in the engine 110, the crankshaft 23 is covered from above by the crankshaft cover 61. Therefore, even if the oil supplied to the lubricated member above the crankshaft 23 moves downward due to gravity, the contact of the oil with the crankshaft 23 (particularly the crank arm) is suppressed by the crankshaft cover 61. obtain. Therefore, it can be suppressed that the oil contacts the crankshaft 23 and loses heat.

  Further, the oil is prevented from being scattered as fine oil particles inside the engine 110 (inside the space surrounded by the cylinder block 20 and the oil pan 30) by the rotation of the crankshaft 23. Thereby, it is possible to suppress the progress of the warm-up operation from being hindered by the oil warmed by absorbing heat by the lubricated member during the warm-up operation being cooled in the air as fine droplets. . Moreover, it can be suppressed that the splashes of the oil adhere to the bearing portions of the crankshaft 23 and the balance shaft 27 and increase their rotational resistance.

  In the engine 10 of the embodiment and the engine 110 of the modified example, the cylinder block 20 and the balance shaft 27 can be made of ceramics.

1 is a schematic configuration diagram of an engine according to an embodiment of the present invention. It is the elements on larger scale of the balance shaft cover shown in FIG. It is a schematic block diagram of the engine which concerns on the modification of this invention. FIG. 4 is an enlarged view of the crankshaft cover shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110 ... Engine, 20 ... Cylinder block, 20b ... Skirt part, 23 ... Crankshaft, 27 ... Balance shaft, 30 ... Oil pan, 40 ... Oil pan separator, 40c ... Balance shaft cover, 40e ... Oil return hole, 40k ... Cylinder block skirt cover, 61 ... Crankshaft cover, A ... First chamber, B ... Second chamber

Claims (7)

A housing for housing the oil-lubricated member;
An oil pan connected to the housing and capable of storing the oil supplied to the lubricated member and recirculated from the lubricated member;
In a machine with an oil pan with
Covering a specific member with which the oil can come into contact with the oil pan from the lubricated member toward the oil pan, and a cover for suppressing contact of the oil with the specific member;
The machine with an oil pan, wherein the cover is made of a material having a lower thermal conductivity than the specific member. The machine with an oil pan according to claim 1,
An oil pan provided in the inner space so as to divide the inner space of the oil pan into a first chamber opening toward the member to be lubricated and a second chamber adjacent to the first chamber. With a separator,
A machine with an oil pan, wherein the cover is formed integrally with the oil pan separator. A machine with an oil pan according to claim 1 or 2,
A machine with an oil pan, comprising a housing cover as the cover that covers an inner wall surface at a lower end portion of the housing as the specific member. A machine with an oil pan according to any one of claims 1 to 3,
A crankshaft as the lubricated member;
A balance shaft as the specific member, which is disposed below the crankshaft and is driven to rotate in synchronization with the crankshaft;
With
A machine with an oil pan, comprising a balance shaft cover as the cover for covering the balance shaft from above. A machine with an oil pan according to claim 4,
The balance shaft cover is provided with a through hole,
The machine with an oil pan, wherein the through hole is formed so that no balance shaft exists vertically below the through hole. The machine with an oil pan according to claim 1,
The said cover is comprised so that the crankshaft as said specific member may be covered, The machine with an oil pan characterized by the above-mentioned. A cylinder block for accommodating at least a piston and a crankshaft;
An oil pan connected to the cylinder block and capable of storing oil;
A balance shaft that is disposed in a space surrounded by the cylinder block and the oil pan and below the crankshaft, and is driven to rotate in synchronization with the crankshaft;
An oil pan separator provided in the inner space so as to divide the inner space of the oil pan into a first chamber opening toward the cylinder block and a second chamber adjacent to the first chamber. When,
In an engine equipped with
A crankshaft cover made of a material having a lower thermal conductivity than the material constituting the crankshaft, and covering the crankshaft from above;
A cylinder block skirt cover that is made of a material having a lower thermal conductivity than the material constituting the cylinder block and covers an inner wall surface at the lower end of the cylinder block;
A balance shaft cover configured from a material having a lower thermal conductivity than the material constituting the balance shaft, and covering the balance shaft from above; and
The engine according to claim 1, wherein the cylinder block skirt cover and the balance shaft cover are formed integrally with the oil pan separator.

Images