JP4581826B2 - Oil strainer pipe - Google Patents

Description

  The present invention relates to an oil strainer pipe that connects an oil strainer and an oil pump.

  Generally, at the time of cold start, the oil in the internal combustion engine is cooled and has a high viscosity, and therefore friction increases. Therefore, conventionally, a device has been proposed in which a heater is provided in the oil passage so that the oil in the oil passage is warmed when the internal combustion engine is started and the viscosity is reduced at an early stage (for example, see Patent Document 1).

As shown in FIG. 15, in the device described in Patent Document 1, a junction 540 between a passage 520 that supplies oil from the oil filter 510 and a passage 530 that supplies the oil to the piston and the crankshaft. A heater 550 is disposed. With the above configuration, the oil in the junction 540 of the passage is heated by the heater when the engine is started, so that the viscosity of the oil can be reduced early and friction can be reduced.
JP-A-6-229220

  By the way, in the apparatus described in Patent Document 1, the oil passage has a complicated structure because a heater must be disposed in the oil passage. The oil is received and warmed while lubricating each part of the engine after the engine is started, but the heat is absorbed by the oil stored in the oil pan or released to the outside air from the outer periphery of the oil pan. For this reason, the heat given to oil in each part of the engine is not necessarily utilized efficiently.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an oil strainer pipe that can circulate warmed oil to an internal combustion engine at an early stage without requiring a complicated device in the oil passage. It is to provide.

In the following, means for achieving the above object and its effects are described.
The invention according to claim 1 is an oil strainer pipe that connects an oil strainer disposed at the bottom of an oil pan of an internal combustion engine and an oil pump, wherein the oil strainer pipe is formed by bending the oil strainer pipe. The heat receiving portion is provided along the inclined surface of the oil pan that is inclined toward the bottom surface, and in the direction of the flow path of the oil that flows to the bottom portion through the inclined surface of the oil pan. The gist is that they are arranged to cross each other .

According to the above configuration, the oil strainer pipe has the heat receiving portion arranged so as to intersect the flow direction of the oil flowing to the bottom of the oil pan, and therefore the temperature is increased by circulating through the internal combustion engine in the heat receiving portion . The heat received from the oil can be promoted. As a result, since the temperature rise of the oil passing through the oil strainer pipe can be promoted, the warmed oil can be circulated to the internal combustion engine at an early stage.

The invention according to claim 2 is the oil strainer pipe according to claim 1, wherein the heat receiving portion is arranged so as to be substantially orthogonal to the flow direction of the oil flowing to the bottom of the oil pan. It is said.

According to the above configuration, the heat receiving portion of the oil strainer pipe is arranged so as to be substantially orthogonal to the oil flow path direction, so that the heat receiving portion circulates through each part of the engine and comes into contact with the heated oil. As a result, the temperature rise of the oil passing through the oil strainer pipe can be promoted with a simple structure.

According to a third aspect of the present invention, in the oil strainer pipe according to the first or second aspect, the inclined surface includes an inclined portion disposed above the oil surface stored in the bottom portion, and the inclined portion. And an upper stage portion that is more gently inclined than the inclined portion, and the heat receiving portion is arranged along the inclined portion .

According to the said structure, since the heat receiving part of an oil strainer pipe is arrange | positioned in the inclination part , most of the oil which flows through an upper stage part comes to contact those parts. For this reason, the heat receiving from the oil heated by circulating through the internal combustion engine in the heat receiving portion can be further promoted.

According to a fourth aspect of the present invention, in the oil strainer pipe according to any one of the first to third aspects, a plate-shaped heat receiving fin is provided in the heat receiving portion along the axial direction of the heat receiving portion. Is the gist.

According to the above configuration, by providing the heat receiving fins in the heat receiving portion of the oil strainer pipe, the contact area with the oil is increased, and the temperature rise of the oil passing through the oil strainer pipe can be further promoted.

According to a fifth aspect of the present invention, in the oil strainer pipe according to any one of the first to fourth aspects, a crankshaft and a camshaft of the internal combustion engine are connected by a chain, and the chain is a crankshaft. The gist of the invention is that it is disposed at the end of the internal combustion engine farther from the bottom in the axial direction.

In general, a chain type camshaft driven internal combustion engine circulates more oil than a belt type camshaft driven internal combustion engine. Therefore, according to the said structure, since many oils which passed through the chain contact the said part to retain or the part to extend, the temperature rise of the oil which passes an oil strainer pipe can be accelerated | stimulated.
In this case, specifically, according to the invention described in claim 6 , the oil pump is arranged at the end of the internal combustion engine farther from the bottom in the axial direction of the crankshaft of the internal combustion engine. It is possible to employ a structure in which the bottom of the oil pump and the oil pump are respectively disposed at both ends in the axial direction of the crankshaft of the internal combustion engine.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a longitudinal sectional view of an engine 1 to which an oil strainer pipe according to this embodiment is applied.

  As shown in FIG. 1, the oil pan 10 is provided at a lower portion of a crankshaft 20 mounted on the engine 1. The oil pan 10 functions as a cover that protects the lower part of the engine 1, stores oil that lubricates the engine 1, and releases heat of oil heated inside the engine 1 to outside air outside the oil pan 10. And has the function of cooling. The oil pan 10 includes an upper step portion 11 and a bottom portion 12, and the bottom portion 12 is the deepest portion of the oil pan 10 in which oil is stored. The upper portion 11 is a part of the oil pan 10 disposed above the oil surface of the oil 40 stored in the bottom portion 12. Furthermore, the upper stage 11 of the oil pan 10 is configured to be slightly inclined from the upper stage 11 toward the bottom 12. Therefore, when the oil which lubricated the crankshaft 20, the camshaft, a cylinder, etc. which is not shown in figure falls to the upper stage part 11, it is the structure which flows toward the bottom part 12. FIG. The region A of the oil pan 10 is an inclined portion that is formed between the upper step portion 11 and the bottom portion 12 and is above the oil surface of the oil 40 stored in the bottom portion 12. The oil strainer 50 is disposed so as to be immersed in the oil 40, and is configured not to inhale air even when the oil surface of the oil 40 is inclined. The oil strainer 50 is a filtration device made of a mesh-like wire net, and large foreign matters in the oil 40 are removed by the oil strainer 50. The oil strainer 50 is connected to the oil pump 30 via an oil strainer pipe 60. The oil pump 30 is disposed at the end of the engine 1 far from the bottom 12 of the oil pan 10 with respect to the axial direction of the crankshaft 20. The oil pump 30 is connected to the crankshaft 20 and is driven by the rotational movement of the crankshaft 20. The crankshaft 20 is connected to the camshaft via a timing belt (not shown), and transmits the rotational motion to the camshaft.

  With such a configuration of the engine 1, when the engine 1 is started and the crankshaft 20 rotates, the oil pump 30 is activated, and the oil 40 at the bottom 12 is sucked from the oil strainer 50 through the oil strainer pipe 60 to the oil pump 30. Is done. The oil sucked into the oil pump 30 is pumped to an oil filter (not shown), circulates through various parts of the engine 1 such as the crankshaft 20, the camshaft, and the cylinder, and then drops into the oil pan 10.

  Here, the oil strainer pipe 60 in the first embodiment is formed of a cylindrical pipe having an outer diameter smaller than the outer diameter of the oil strainer 50, and is formed of a steel material. The oil strainer pipe 60 is connected to an oil strainer 50 located substantially at the center of the bottom 12, and extends substantially vertically from the oil strainer 50 to above the oil surface of the oil 40. From there, it bends in the direction of the oil pump 30 so as to be substantially horizontal with the axial direction of the crankshaft 20, and extends along the region A of the oil pan 10. And it arrange | positions along the oil pan 10 from the area | region A to the upper stage part 11, and is connected with the oil pump 30 located in the edge part of the engine 1. FIG. The oil strainer pipe 60 and the oil pan 10 may be in contact with each other or may have a slight gap.

FIG. 2 is a plan view showing the structure of the oil strainer pipe 60.
As shown in FIG. 2, the oil dropped from each part of the engine 1 to the upper stage 11 flows in the direction of the arrow in the figure, that is, from the oil pump 30 to the oil strainer 50 due to the inclination of the upper stage 11. The oil strainer pipe 60 is disposed in the upper stage 11 in the same direction as the oil flow direction. In the region A, the heat receiving portion 61 of the oil strainer pipe 60 is disposed so as to be substantially orthogonal to the oil flow direction. The heat receiving portion 61 is arranged so as to straddle the oil flow path of the upper step portion 11 from the vicinity of one side surface of the oil pan 10 to the vicinity of the other side surface, and is configured to be able to block the oil flow. Yes. Further, the oil strainer pipe 60 is disposed in the same direction as the oil flow direction along the side surface of the oil pan 10 from the region A to the bottom portion 12. Furthermore, the oil strainer pipe 60 and the oil strainer 50 are connected to the oil strainer 50 above the bottom 12 so as to be substantially orthogonal to the oil flow direction.

<Effect of embodiment>
As described above in detail, according to the oil strainer pipe according to the first embodiment, the effects listed below can be obtained.
(1) Since the oil strainer pipe 60 is arranged at the heat receiving portion 61 so as to be substantially orthogonal to the oil flow direction, the oil that has circulated through each part of the engine 1 and has risen in temperature falls to the upper step portion 11, and is All the oil flowing through 11 contacts the heat receiving portion 61. Therefore, in the heat receiving part 61, heat transfer is performed from the oil staying outside the heat receiving part 61 to the oil flowing inside the oil strainer pipe 60, and heat receiving can be promoted. As a result, since the temperature rise of the oil passing through the oil strainer pipe 60 can be promoted, the warmed oil can be circulated through the engine 1 at an early stage.
(2) Since the oil strainer pipe 60 may be configured so as to be substantially orthogonal to the direction of the oil flow path, a special device for early oil temperature increase at the time of cold start as in the prior art is not required. The structure of the engine 1 is not complicated.

<Example of change>
In addition, the said 1st Embodiment can also be implemented as the following forms which changed this suitably, for example.

  In the above embodiment, the heat receiving portion 61 of the oil strainer pipe 60 is bent and arranged along the oil pan 10 in the region A in the vicinity of the upper step portion 11. May be. However, it is necessary to arrange the heat receiving portion 61 above the oil surface of the oil 40 stored in the bottom portion 12. When the heat receiving portion 61 and the oil 40 are in contact with each other, heat exchange is performed in these portions. Therefore, a part of heat given to the heat receiving part 61 from the oil warmed in each part of the engine 1 is dispersed into the oil 40 in the bottom part 12. As a result, the temperature rise effect at the heat receiving portion 61 is reduced.

  In the above embodiment, the heat receiving portion 61 of the oil strainer pipe 60 is arranged from the vicinity of one side surface of the oil pan 10 to the vicinity of the other side surface, but the length of the heat receiving portion 61 can be changed. If the heat receiving unit 61 is configured to be long, the amount of oil staying in the heat receiving unit 61 increases, so that heat exchange with the heat receiving unit 61 is frequently performed and the temperature of the oil passing through the oil strainer pipe 60 is increased. It can be promoted more. On the other hand, if the heat receiving portion 61 is configured to be short, the amount of oil staying in the heat receiving portion 61 is reduced, so heat exchange is reduced and the effect of promoting the temperature rise of the oil passing through the oil strainer pipe 60 can be suppressed. It becomes. Therefore, the temperature rise of the oil passing through the oil strainer pipe 60 can be adjusted by changing the length of the heat receiving portion 61.

  In the above embodiment, the oil pan 10 is configured by one stage each of the upper stage part 11 and the bottom part 12, but is configured such that the upper stage part has two or more stages and the bottom part has two or more stages. Or any combination thereof. By providing the heat receiving part 61 in the oil strainer pipe 60, the oil passing through the oil strainer pipe 60 can be heated in the heat receiving part 61 as long as the oil stays in the heat receiving part 61.

  As shown in FIG. 3, in region A, the heat receiving portion 71 of the oil strainer pipe 70 is arranged so as to be orthogonal to the oil flow direction, and the oil flowing from the upper portion 11 of the oil pan 10 is further dammed up. It is good also as a curved shape so that it may be. By making the heat receiving portion 71 such a shape, the amount of oil staying in the heat receiving portion 71 is increased. Therefore, a large amount of heat exchange is performed in the heat receiving portion 71, and the temperature rise of the oil passing through the oil strainer pipe 70 can be further promoted.

  As in the above embodiments, the heat receiving portions 61 and 71 of the oil strainer pipes 60 and 70 are not disposed in the region A, but the oil strainer pipe 80 is disposed on the upper portion 11 of the oil pan 10 as shown in FIG. The heat receiving portion 81 may be disposed. In short, if the oil warmed by circulating through each part of the engine stays in the heat receiving part, it is possible to promote the temperature rise of the oil passing through the oil strainer pipe by heat exchange in the heat receiving part. It is.

  -As shown in FIG. 5, the structure by which the heat receiving part 91 of the oil strainer pipe 90 is provided with two or more in the upper stage part 11 and the area | region A may be sufficient. By adopting a configuration in which a plurality of such heat receiving portions 91 are provided, the contact area between the heat receiving portion 91 and the oil flowing through the upper stage portion 11 becomes larger than in the first embodiment. As a result, the temperature rise effect of the oil passing through the oil strainer pipe 90 in the heat receiving portion 91 can be further promoted.

  As shown in FIGS. 6 and 7, the oil pan 13 may have a configuration in which only the bottom portion 14 is provided without providing the upper step portion. FIG. 6 is an example of an oil pan 13 that is not provided with an upper stage portion, and shows a longitudinal sectional view of the engine 1. As shown in FIG. 6, the oil pan 13 is the same as the first embodiment in that the bottom portion 14 and the inclined portion are provided, but is different in that the upper step portion 11 is not provided. Further, as shown in FIG. 7, the oil strainer pipe 62 is bent and formed so as to be substantially perpendicular to the oil flow direction in the inclined portion, as in the first embodiment. Thus, even if the oil pan 13 is not provided with the upper step portion, the oil flowing through the inclined portion can be retained in the heat receiving portion 63, so that the oil passing through the oil strainer pipe 62 is raised in the heat receiving portion 63. Can be warmed.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the shape of the oil strainer pipe 60 is changed in the first embodiment, and a chain 170 is provided as a drive means for the camshaft. The other configurations are the same as those in the first embodiment. It has become. Therefore, components common to the first embodiment are denoted by reference numerals obtained by adding “100” to the symbols given to the configurations of the first embodiment.

  As shown in FIG. 8, the second embodiment is the same as the first embodiment in that the oil strainer pipe 160 of the engine 101 is arranged along the upper stage 111 of the oil pan 110. However, it differs from the first embodiment in that the oil strainer pipe 160 is not disposed along the oil pan 110 in the region A. In the second embodiment, the crankshaft 120 is connected to a camshaft (not shown) via a chain 170 and transmits the rotational motion to the camshaft. Further, as shown in FIG. 9, the oil strainer pipe 160 is not disposed so that the heat receiving portion 161 is orthogonal to the oil flow direction, but at an acute angle with respect to the oil flow direction. It is also different in that it is bent.

<Effect of embodiment>
As described above in detail, according to the oil strainer pipe according to the second embodiment, the effects listed below can be obtained.
(1) Since the oil strainer pipe 160 is bent at an acute angle with respect to the flow direction of the oil flowing through the upper stage 111, the oil flows along the heat receiving part 161, and the heat receiving part 161 passes through the upper stage 111. There will be much contact with the flowing oil. Therefore, heat is transferred from the oil flowing outside the heat receiving portion 161 to the heat receiving portion 161, and heat receiving from the oil whose temperature is increased by circulating through each part of the engine 101 in the heat receiving portion 161 can be promoted. As a result, the temperature rise of the oil passing through the oil strainer pipe 160 can be promoted, so that the warmed oil can be circulated through the engine 101 at an early stage.
(2) Since the engine is a chain-type camshaft drive engine, more oil flows through the upper portion 111 than the belt-type camshaft drive engine. As a result, since a large amount of oil that has passed through the chain comes into contact with the heat receiving portion 161, it is possible to promote the temperature rise of the oil passing through the oil strainer pipe 160.
(3) Since the oil strainer pipe 160 may be configured to have an acute angle with respect to the flow direction of the oil flowing through the upper stage portion 111, it is special for the early oil temperature increase at the cold start as in the prior art. A simple device is not required, and the structure of the engine 1 is not complicated.

<Example of change>
In addition, the said 2nd Embodiment can also be implemented as the following forms which changed this suitably, for example.

  In the above embodiment, the oil strainer pipe 160 is not disposed along the oil pan 110 in the region A. However, the oil strainer pipe 160 is disposed along the oil pan 110 in the region A, or both the upper stage portion 111 and the region A. You may arrange | position along the oil pan 110 in an area | region. In short, if the oil flowing from the upper stage portion 111 flows along the heat receiving portion 161, the heat receiving portion 161 will come into much contact with the oil flowing through the upper step portion 111. Therefore, the oil flowing through the oil strainer pipe 160 in the heat receiving portion 161 can be efficiently heated by the oil that is circulated through each part of the engine 101 and warmed.

(Other embodiments)
In addition, elements that can be changed in common with each of the above embodiments are listed below.
-As shown in FIG. 10, the temperature increase of the oil which flows through the inside of the oil strainer pipe in a heat receiving part can be promoted more by setting it as the structure which provides a heat receiving fin in a heat receiving part. FIG. 10 is an example of a heat receiving fin, and shows a longitudinal sectional view of the heat receiving fin. The heat receiving unit 220 includes heat receiving fins 230 at predetermined positions in the circumferential direction of the outer peripheral portion thereof. The heat receiving fins 230 have a thin plate shape, and are formed long in the circumferential direction of the heat receiving unit 220 at predetermined intervals and along the axial direction. By providing such heat receiving fins 230, the oil flowing through the upper stage portion is further blocked by the heat receiving fins 230, and the temperature rising effect of the heat receiving portions can be promoted by the retention of the heated oil. Further, the heat receiving fins 230 increase the contact area between the oil staying in the heat receiving unit 220 and the heat receiving unit 220, and can further promote the temperature rise of the oil passing through the oil strainer pipe.

  The heat receiving fin may have a structure as shown in FIGS. FIG. 11 is an example of a heat receiving fin, and shows a longitudinal sectional view of the heat receiving fin and the punch metal. As shown in FIG. 11, heat receiving fins 330 and a thin plate-shaped punch metal 340 are provided on the outer periphery of the heat receiving unit 320 so as to be in contact with the oil pan. The heat receiving fins 330 and the punch metal 340 are formed long in the axial direction with a predetermined interval in the circumferential direction of the heat receiving portion 320. FIG. 12 is a front view of a punch metal 340 having a plurality of holes. By configuring the heat receiving fins 330 as described above, the oil flowing to the heat receiving unit 320 is blocked by the heat receiving fins 330 and stays there. When the accumulated oil reaches the position of the hole of the punch metal 340, it passes through the hole and flows to the bottom of the oil pan (not shown). By providing the heat receiving fins 330 and the punch metal 340, the oil stays more in the heat receiving portion 320, and the temperature rising effect of the oil flowing inside the oil strainer pipe can be promoted. Further, the heat receiving fins 330 and the punch metal 340 increase the contact area between the oil staying in the heat receiving part 320 and the heat receiving part 320, and can further promote the temperature rise of the oil passing through the oil strainer pipe.

-Although the said heat receiving fin is comprised by 6 sheets in FIG. 10, and 2 sheets (a punch metal is included) in FIG. 11, the number of heat receiving fins may be comprised by what number.
-The shape and attachment position of the said heat receiving fin are not limited to the shape and attachment position shown by FIG. For example, the heat receiving fins 230 shown in FIG. 10 may have a curved shape, or the punch metal attachment position shown in FIG. 11 may be arranged closer to the vicinity of the oil pan 310.

  Furthermore, as shown in FIGS. 13 and 14, the heat receiving fins may be arranged along the upper step 411 and the region A of the oil pan 410 and orthogonal to the oil flow direction. FIG. 13 is an example of the oil strainer pipe 460 provided with the heat receiving fins 461, and shows a longitudinal sectional view showing the arrangement of the oil strainer pipe 460 in the oil pan 410. FIG. 14 is a plan view showing the arrangement of the oil strainer pipe 460. As shown in FIG. 13, the oil strainer pipe 460 is provided with heat receiving fins 461 approximately the same height as the oil strainer pipe 460 along the oil pan 410. Further, as shown in FIG. 14, the oil strainer pipe 460 is arranged without being bent from an oil pump 430 positioned at the approximate center of the left end of the upper stage portion to an oil strainer 450 positioned at the approximate center of the bottom portion 412. Here, the oil strainer pipe 460 is provided with heat receiving fins 461 in the upper step 411 and the region A so as to be substantially orthogonal to the oil flow direction. By providing such heat receiving fins 461, the oil stays in the heat receiving fins 461, and the temperature rise effect of the oil can be promoted. Moreover, since the heat receiving fins 461 are provided, the contact area between the oil strainer pipe 460 and the oil flowing through the upper stage portion 411 is increased, so that the temperature rising effect of the oil flowing inside the oil strainer pipe 460 can be promoted. The heat receiving fins 461 shown in FIGS. 13 and 14 are arranged so as to be substantially orthogonal to the flow direction of the oil flowing through the upper stage 411 and the region A, but are arranged so as to have a predetermined angle even if they are not orthogonal. May be. Further, the shape of the heat-receiving fins such as the number of heat-receiving fins or the width and height is not limited to that shown in FIGS. The point is that the oil strainer pipe 460 can be installed if the oil flow along the inner surface of the oil pan 410 stays temporarily or the distance to reach the bottom is extended by providing the heat receiving fins. The temperature rise of the oil passing therethrough can be further promoted.

The longitudinal cross-sectional view which shows the structure of the oil strainer pipe concerning 1st Embodiment of this invention. The top view which shows the structure of the bending part of the said oil strainer pipe. The top view which shows the modification concerning the structure of the bending part of the said oil strainer pipe. The top view which shows the other modification concerning the structure of the bending part of the said oil strainer pipe. The top view which shows the other modification concerning the structure of the bending part of the said oil strainer pipe. The longitudinal cross-sectional view which shows the other modification concerning the structure of the bending part of the said oil strainer pipe. The top view which shows the other modification concerning the structure of the bending part of the said oil strainer pipe. The longitudinal cross-sectional view which shows the structure of the oil strainer pipe concerning 2nd Embodiment of this invention. The top view which shows the structure of the bending part of the said oil strainer pipe. Sectional drawing which shows the structure of the heat receiving fin concerning other embodiment. Sectional drawing which shows the modification of the said heat receiving fin. The front view which shows the structure of the punch metal of the said modification. The longitudinal cross-sectional view which shows the structure of the oil strainer pipe concerning other embodiment. The top view which shows the structure of the heat receiving fin of the said oil strainer pipe. The perspective view which shows the structure of the apparatus which heats the conventional oil.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,101,401 ... Engine 10,13,110,210,310,410 ... Oil pan, 11,111,411 ... Upper part, 12,14,112,412 ... Bottom part, 20,120,420 ... Crankshaft , 30, 130, 430 ... oil pump, 40, 140, 440 ... oil, 50, 150, 450 ... oil strainer, 60, 62, 70, 80, 90, 160, 460 ... oil strainer pipe, 61, 63, 71 , 81, 91, 161, 220, 320 ... heat receiving portion, 170 ... chain, 230, 330, 461 ... heat receiving fin, 340 ... punch metal, 510 ... oil filter, 520, 530 ... passage, 540 ... confluence portion, 550 ... heater.

Claims (6)

In an oil strainer pipe connecting an oil strainer and an oil pump arranged at the bottom of an oil pan of an internal combustion engine,
The oil strainer pipe has a heat receiving portion formed by bending the oil strainer pipe,
The heat receiving portion is provided along an inclined surface of the oil pan that is inclined toward the bottom surface, and is disposed so as to intersect with a flow direction of the oil flowing to the bottom portion through the inclined surface of the oil pan. Oil strainer pipe characterized by The oil strainer pipe according to claim 1,
An oil strainer pipe, wherein the heat receiving portion is arranged so as to be substantially orthogonal to a flow direction of oil flowing to a bottom portion of the oil pan. In the oil strainer pipe according to claim 1 or 2 ,
The inclined surface includes an inclined portion disposed above the oil surface stored in the bottom portion, and an upper step portion disposed above the inclined portion and having a gentler inclination than the inclined portion. The oil strainer pipe is characterized in that the heat receiving portion is arranged along the inclined portion . In the oil strainer pipe according to any one of claims 1 to 3 ,
An oil strainer pipe , wherein the heat receiving portion is provided with plate-shaped heat receiving fins along the axial direction of the heat receiving portion . Billing the crankshaft and the camshaft of the internal combustion engine is coupled by a chain, said chain, characterized in that disposed on the end of the internal combustion engine remote from the bottom in the axial direction of the crankshaft Item 5. The oil strainer pipe according to any one of Items 1 to 4 . The oil pump is disposed at the end of the internal combustion engine that is farther from the bottom in the axial direction of the crankshaft of the internal combustion engine, so that the bottom of the oil pump and the oil pump are connected to the crank of the internal combustion engine. The oil strainer pipe according to any one of claims 1 to 5 , wherein the oil strainer pipe is disposed on both ends of the shaft in the axial direction.

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