JP5394223B2 - Oil line take-out structure for oil cooler - Google Patents

Description

  The present invention relates to an oil line take-out structure to an oil cooler that is mounted to cool engine oil.

  In general, the engine lubrication system called the pressure-feed type and the pressure-and-splash type engine oil is sucked up by an oil pump that operates in conjunction with the crankshaft, and the oil stored in the oil pan located at the bottom of the engine. Oil is supplied to each part of the engine, and the engine oil supplied to each part of the engine circulates again to the oil pan to constitute a lubrication path (oil line). The oil line is provided with a replaceable oil filter at an appropriate position so that foreign matters contained in the circulating oil can be removed.

  Moreover, an oil cooler may be provided in this oil line as needed. This is because if the engine oil becomes high temperature, the viscosity becomes soft and the oil film forming function is lowered, and sludge generation and oil deterioration are caused, which is not preferable, and excessive temperature rise is suppressed.

  When installing an oil cooler, as shown in FIG. 5 (a), an oil extraction outlet 1 and an oil return return 2 that do not communicate with each other are provided at any position on the oil line. A method of connecting the hoses 11 and 12 drawn from the core of the oil cooler 10 to the respective ports 1 and 2 is generally used. According to this method, the oil led out from the take-out port 1 toward the oil cooler 10 is cooled in the core of the oil cooler 10, and the cooled oil returns to the original oil line through the return port 2. Has been circulating.

  In addition, a thermostat is attached as necessary to prevent overcooling of the oil by the oil cooler at the time of starting the engine or during winter operation. For example, as shown in FIG. 5A, the thermostat is a thermostat (thermo valve unit) provided between a hose 11 going from the take-out port 1 to the oil cooler 10 and a hose 12 going from the oil cooler 10 to the return port 2. ) 40 is used.

  As shown in FIGS. 5B and 5C, the thermo valve unit 40 has a route 42 for short-circuiting the hoses 11 and 12, and the short-circuit route 42 senses the oil temperature and operates. A thermo valve 41 is provided. Reference numeral 43 in the figure is a wiring leading to the oil temperature gauge. When the oil temperature is low, the thermo valve 41 opens the short-circuit route 42 to circulate the oil, so that a large amount of oil does not flow through the oil cooler 10. Further, when the oil temperature becomes high, it functions to close the short circuit route 42 and supply oil to the oil cooler 10 (see, for example, Patent Document 1).

  Furthermore, an oil passage for constituting the thermo valve unit 40, an outlet 1 for connecting a hose 11 directed to the oil cooler 10 through the oil passage of the thermo valve unit 40, and a hose 12 from the oil cooler 10. There is also disclosed a technique in which the return port 2 for connecting the two is integrally provided in the crankcase cover of the engine E (see, for example, Patent Document 2).

  In many automobile-mounted engines, a cylinder-type oil filter mounting hole is provided in the cylinder block, and the oil filter can be easily connected to the oil line through the mounting hole. . For this reason, a thermo valve unit having a take-out port and a return port for mounting an oil cooler is generally interposed between the cartridge-type oil filter and the mounting hole (see, for example, Patent Document 3). ).

Japanese Patent Laid-Open No. 9-144521 (FIG. 8-10, page 6) JP 2006-152832 A JP-A-9-137706

  However, in a motorcycle-mounted engine, when the thermostat (thermo valve unit) 40 of Patent Document 1 is used, the take-out port 1 and the return port 2 provided in the engine E, as shown in FIG. The thermo valve unit 40 is interposed in the middle of the hoses 11 and 12 connecting the oil cooler 10 fixed to the frame F. For this reason, the connection location of a hose increases, and since installation of not only the thermostat but the oil cooler 10 becomes very complicated, it is not preferable.

  Further, since the thermo valve unit 40 is always maintained in a suspended state via the hoses 11 and 12, the thermo valve unit 40 has a problem that vibration of the vehicle body is further amplified and transmitted, and a failure is likely to occur. . Further, since the thermo valve unit 40 is provided so as to be exposed outside the engine E, it is not preferable because foreign objects or a cylinder block body may come into contact with the thermo valve unit 40 and give an impact during traveling. . Moreover, since the thermo valve unit 40 exposed to the outside is interposed, the portions where the hoses 11 and 12 are routed are not clean in appearance.

  Further, when the thermo valve 41 or the entire thermo valve unit 40 is removed from the hoses 11 and 12 in order to replace the thermostat, the hoses 11 and 12 are shaken during the removing operation, so that they remain in the oil cooler 10. Engine oil that has leaked from the removed part. For this reason, when exchanging the thermostat, it is necessary to open the drain bolt in advance to completely drain all engine oil, which is troublesome.

  In this regard, according to the configuration described in Patent Document 2, the above problem does not occur. However, when the oil cooler 10 is to be attached to a two-wheeled vehicle that does not include the oil cooler 10, it is necessary to replace the existing crankcase cover with a specially prepared crankcase cover.

  The dedicated crankcase cover is a special crankcase having an oil passage for constituting the thermo valve unit 40 and an oil line outlet and return port to the oil cooler 10. For this reason, it can be said that there is room for further improvement from the viewpoint of sharing parts and reducing costs.

  In general, engines mounted on motorcycles such as motorcycles and motorbikes are equipped with an oil filter in the crankcase so that they are not exposed to the outside. The thermo valve unit described in Patent Document 3 on the premise of this oil filter cannot be used.

  Therefore, the first object of the present invention is to make it possible to easily install the oil line take-out port and the return port to the oil cooler, and further to maintain the thermostat for adjusting the oil supply to the oil cooler. The second problem is to facilitate the process.

  In order to solve the first problem, the present invention includes a crankcase cover that closes a side surface of a crankcase, and an oil line for lubrication and a storage portion for an oil filter are formed on the crankcase cover. The lubricating oil line includes a forward oil passage leading to the storage portion and a return oil passage drawn from the storage portion, and a space in the storage portion is separated from the outside of the crankcase by a cover member, A holding member having a cylindrical partition wall that divides the space in the storage portion into an inner space and an outer space is provided, the oil filter can be stored in the inner space, and the forward oil passage is connected to the inner space or the outer space. The return oil passage is communicated with one of the inner space and the other of the outer space, and the cover member is connected to the oil cooler for oil discharge. And a first oil passage connecting one of the inner space or the outer space and the outlet port to the cover member, and the inner space or the return port for oil return from the oil cooler. A second oil passage connecting the other outer space and the return port is formed, and the lubricating oil flowing through the lubricating oil line is circulated and supplied to the oil cooler via the take-out port and the return port. An oil line take-out structure for an oil cooler characterized by being made possible.

  If it does in this way, the taking-out port for oil derivation and the return port for oil return can be simply provided using the storage part of the oil filter provided in the crankcase. For this reason, it becomes possible to easily install the oil cooler.

  That is, according to this structure, for example, in a vehicle shipped without an oil cooler from a manufacturer, in particular, in a vehicle in which the extraction port and the return port are not formed in advance in the engine, A cooler can be installed.

  Further, in order to solve the second problem, in the above-described configuration, the present invention further connects the first oil passage and the second oil passage at a communication portion, and the communication portion has a constant temperature. A configuration was adopted in which a thermostat that senses the above oil temperature to close the communication portion and senses an oil temperature below a certain temperature to open the communication portion is provided.

  In this way, the thermostat can be firmly fixed integrally with the engine to prevent the occurrence of a failure, and the hose is provided between the oil outlet and the oil return outlet and the oil cooler. Since it can be directly connected, the connection is easy and the appearance is neat. In addition, there is an advantage that it is not necessary to touch the hose for connecting the oil cooler when the thermostat is attached or replaced.

  In each of these configurations, the holding member includes a base portion that engages with the crankcase cover at the back of the storage portion, and the partition wall portion has an inner end in the cylinder axis direction fixed to the base portion. It is possible to adopt a configuration in which the inner space and the outer space are separated by closing the outer end in the cylinder axis direction by the cover member.

  In this way, when the holding member separates the space in the storage portion into the inner space and the outer space, the inner end in the cylinder axial direction of the partition wall can be closed at the base and the outer outer end in the cylindrical axis can be closed by the cover member. . For this reason, arrangement | positioning of the piping for connecting the 1st oil path provided in the cover member and the 2nd oil path, and the inner side space and outer side space in a accommodating part is easy.

  Further, in each of these configurations, the oil filter includes a cylindrical filter portion and end surface members that close both ends in the cylinder axial direction, and the end surface member is provided with a flow hole for lubricating oil. The base may include a connection portion that connects the flow hole of the oil filter and the forward oil passage or the return oil passage, and the connection portion may be inserted into the flow hole.

  Further, in each of these configurations, the base portion includes a concave portion facing toward the back side of the storage portion, and the forward oil passage or the return oil passage is inserted into the concave portion, and the connection portion is A configuration facing the recess can be employed.

  Furthermore, an oil line take-out structure for an oil cooler composed of each of these components is formed in advance, for example, in a vehicle shipped without an oil cooler from a manufacturer, in particular, in an engine. The following configuration can be adopted as a method of adding to a vehicle not equipped.

  In other words, the configuration adds an oil line take-out structure for the oil cooler having the above-mentioned constitutions to an engine that does not have an oil take-out port for oil discharge to the oil cooler and a return port for oil return from the oil cooler. An oil line takeout structure construction method for an oil cooler is provided, wherein the engine includes a crankcase cover that closes a side surface of the crankcase, and a lubricating oil line and a storage portion for an oil filter are formed on the crankcase cover, The lubricating oil line includes a forward oil passage leading to the storage portion and a return oil passage drawn from the storage portion, and a space in the storage portion is separated from the outside of the crankcase by a lid, The oil filter housed in the cylinder has a cylindrical filter part and end face members that close both ends in the cylinder axial direction. The end face member is provided with a flow hole for lubricating oil, the forward oil path or the return oil path is inserted into the flow hole, the lid is removed, and the space in the storage portion is removed. By providing the holding member, storing the oil filter in the inner space, and closing the storage portion with the cover member, an outlet for extracting oil to the oil cooler and a return port for returning oil from the oil cooler This is a method for constructing an oil line take-out structure for an oil cooler.

  According to the present invention, it is possible to easily attach the oil line take-out port and the return port to the oil cooler and the thermostat for adjusting the supply of oil to the oil cooler.

1 shows an embodiment, (a) is an enlarged cross-sectional view of the main part, (b) is a left side view of (a), and (c) is a front view of (a). In the embodiment, the oil cooler is not supplied with oil, (a) is an enlarged plan view of the main part, (b) is a front view thereof. In the same embodiment, it shows a state where oil is supplied to the oil cooler, (a) is an enlarged plan view of the main part, (b) is a front view thereof Main part enlarged view of the conventional example The oil cooler attachment structure of a prior art example is shown, (a) is a general view, and (b) and (c) are explanatory views showing the operation.

  An embodiment will be described with reference to FIGS. 1 to 3. The oil cooler oil line take-out structure of this embodiment is provided in the middle of the lubricating oil line of the engine E so that the oil cooler can be attached to the four-cycle engine E mounted on a motorcycle.

  In the lubricating oil line, the lubricating oil (engine oil) stored in the oil pan 3 located below the cylinder block 4 and the crankcase 5 is the crankshaft as in the conventional example shown in FIG. The oil is sucked up by an oil pump that operates in conjunction with the rotation of the oil, and oil is supplied to each part of the engine E by its hydraulic pressure.

  The oil line for lubrication is roughly divided into two directions, and one of the routes is a route from the oil pump to the cylinder head or the like, and the lubricating oil in that route lubricates the camshaft and the like through the cylinder head. At the same time, the cylinder block 4 and the like are cooled through an oil passage around the cylinder block 4, and then falls to the oil pan 3.

  The other route is a route from the oil pump to the crankshaft, etc., and the lubricating oil in that route lubricates and cools the inside of the cylinder, the piston, the crankshaft, the transmission, etc., and then falls to the oil pan 3 Each oil line for lubrication is configured.

  These lubricating oil lines pass through an oil passage (hereinafter referred to as “oil line D”) provided in a crankcase cover (clutch cover) 6 that closes the side surface of the crankcase 5. An oil filter is provided in the middle of D.

  In an ordinary engine E, as shown in the conventional example of FIG. 4, the oil filter has a storage portion 16 that is a space for storing an oil filter formed in the middle of the oil line D. The oil filter 13 can be stored. Further, the oil line D includes an outward oil passage 7 that leads to the storage portion 16 and a return oil passage 8 that is drawn from the storage portion 16. The space in the storage portion 16 is separated from the outside of the crankcase by the lid 14.

The oil filter 13 includes a cylindrical filter portion 13b and end surface members 13d and 13e that close both ends in the cylinder axis direction. Among the end surface members 13d and 13e, an end surface member 13e on the back side of the storage portion 16 A lubricating oil flow hole 13a is provided. Since the end of the return oil passage 8 slightly protrudes, the protruding portion 8a, which is the protruding portion, can be inserted into the flow hole 13a.
Normally, since the oil filter 13 is cylindrical, the space in the storage portion 16 is also formed in a circular cross section along the outer peripheral surface of the oil filter 13. Normally, the return oil passage 8 is set to communicate with the space in the filter portion 13b of the oil filter 13, and the forward oil passage 7 is set to communicate with the space outside the filter portion 13b.

  By storing the oil filter 13 in the storage portion 16 and closing it with the lid 14, foreign oil contained in the oil is removed by the oil filter 13 when the lubricating oil passes through the oil line D and the storage portion 16. It can be done. The engine E is assumed to be provided with no oil cooler 10, and an oil outlet lead-out port 1 and an oil return inlet port 2 to the oil cooler 10.

A method for constructing the oil outlet D for oil delivery to the oil cooler 10 and the oil outlet return port d in the oil line D of the engine E will be described.
FIGS. 1 to 3 all show a state after an extraction port c and a return port d for oil return are constructed in the oil line D of the engine E. FIG.

  In FIG. 4, when the lid 14 is removed and the oil filter 13 is accommodated therein, the oil filter 13 is also removed. At this time, the lubricating oil can be removed by loosening the drain bolt of the oil pan 3 in advance.

  The holding member 22 is stored in the storage portion 16. As shown in FIG. 1A, the holding member 22 includes a base portion 22 b that engages with the crankcase cover 6 at the back of the storage portion 16. The holding member 22 includes a cylindrical partition wall portion 22a fixed to the base portion 22b.

  The base portion 22 b includes a concave portion (hole) 22 g that faces the back side of the storage portion 16. The protrusion 8a of the return oil passage 8 can be inserted into the recess 22g. A connecting portion 22f is provided so as to penetrate the base portion 22b. Since the connecting portion 22f faces the concave portion 22g, the connecting portion 22f and the return oil passage 8 communicate with each other by inserting the protruding portion 8a into the concave portion 22g.

  In addition, the inner end in the cylinder axis direction of the partition wall 22 a is fixed to the base portion 22 b, and the outer end in the cylinder axis direction is closed by the cover member 21. When the outer end of the partition wall portion 22a in the cylinder axis direction is closed by the cover member 21, the inner space f and the outer space a of the partition wall portion 22a are separated from each other. The partition wall 22a is not limited to a cylindrical shape as long as it has a cylindrical shape, but may be any shape and size that can accommodate the oil filter 23 therein.

  The oil filter 23 is accommodated inside the partition wall 22 a of the holding member 22. Similar to the conventional oil filter 13, the oil filter 23 includes a cylindrical filter portion 23b and end surface members 23d and 23e that close both ends in the cylinder axial direction. Of the end surface members 23d and 23e, the inner end surface member 23e is provided with a lubricating oil flow hole 23a.

  Since the end portion of the connecting portion 22f of the base portion 22b of the holding member 22 slightly protrudes toward the cover member 21, the protruding portion 22h, which is the protruding portion, can be inserted into the flow hole 23a of the oil filter 23. . By this insertion, the connecting portion 22f and the flow hole 23a communicate with each other. That is, the inner space of the filter portion 23 b of the oil filter 23 is in a state of communicating with the return oil passage 8.

  In this embodiment, the oil filter 23 employs an oil filter that has a slightly smaller cross section perpendicular to the cylinder axis and a slightly shorter overall length in the cylinder axis direction than the conventional oil filter 13. However, when the holding member 22 that can store the conventional oil filter 13 can be mounted in the storage portion 16, the oil filter 13 of the same standard may be fixed to the holding member 22.

  Thus, in a state where the holding member 22 is stored in the storage portion 16, the storage portion 16 is closed by the cover member 21, so that the forward oil passage 7 of the oil line D is in the outer space a in the storage portion 16. The return oil path 8 communicates with the inner space f in the storage portion 16.

  The cover member 21 is an oil line take-out unit 20 in which a lid portion 21a that mainly closes the storage portion 16 and a thermo storage portion 21b that mainly stores a thermostat are integrally molded. Is configured.

  The thermo-accommodating portion 21 b is formed with an outlet c for extracting oil to the oil cooler 10 and a return port d for returning oil from the oil cooler 10. In this embodiment, the take-out port c and the return port d are constituted by connection pipes 33 and 34 screwed into the female screw portions 21c and 21d. The connecting pipes 33 and 34 can be connected to hoses 11 and 12 leading to the oil cooler 10, respectively.

  Further, a first oil passage b communicating with the take-out port c and a second oil passage e communicating with the return port d are provided across the thermo storage portion 21b and the lid portion 21a.

  In a state where the cover member 21 is fixed to the crankcase cover 6 (a state where the storage portion 16 is closed), the outer space a and the first oil passage b communicate with each other, and the inner space f and the second oil passage e. And communicate.

  Further, the first oil passage b and the second oil passage e are connected by a communication portion 32. The communication portion 32 is detachably provided with a thermostat 30 that senses an oil temperature above a certain temperature and closes the communication portion 32 and senses an oil temperature below a certain temperature and opens the communication portion 32. Yes.

  As shown in FIG. 1C, the communication portion 32 is provided orthogonal to the first oil passage b and the second oil passage e, and further, the first oil of the communication portion 32 is provided. The rear part, that is, the lower part on the side of the path b is closed, and the second oil path e side, that is, the upper part, has an opening extending on the concentric shaft to reach the outer surface of the cover member 21.

  A thermo valve 31 shown in FIG. 1C is screwed into this opening, and is fixed by turning and tightening the head portion 31a. As shown in FIGS. 2B and 3B, the thermo valve 31 senses an oil temperature above a certain temperature by the action of a spring 35 made of a shape memory alloy and a normal spring 37. The body 36 is moved to close the valve hole of the communication portion 32, and the valve body 36 is moved by sensing the oil temperature below a certain temperature to open the valve hole of the communication portion 32. That is, the thermostat 30 that opens and closes the communication portion 32 is configured.

  The thermo-valve 31 is screwed inward from the opening to close the opening in a liquid-tight manner, and the tip of the thermo-valve 31 reaches the inner part. It is provided so that it can be detached from the cover member 21 as appropriate.

  The operation of the oil line take-out structure for the oil cooler will be described. As shown in FIGS. 2A and 2B, in the state where the lubricating oil has not yet warmed, the thermo valve 31 has the spring 35 contracted and the spring 37. And the valve body 36 is retracted from the valve hole, and the communication portion 32 is open. In this state, the lubricating oil supplied by the oil pump of the engine E branches from the first oil passage b to the communication portion 32 and the hose 11 of the oil cooler 10.

  At this time, the core of the oil cooler 10 is composed of a large number of fins, and the flow path is very thin in each fin. Therefore, the flow resistance of the oil line toward the oil cooler 10 is large, and almost all The lubricating oil is supplied from the second oil passage e to the oil filter 23 in the storage portion 16 through the communication portion 32 having a relatively low flow resistance. For this reason, the lubricating oil is not significantly affected by the air cooling effect of the oil cooler 10, and overcooling of the lubricating oil is prevented.

  When the lubricating oil warms and exceeds a predetermined temperature, as shown in FIGS. 3 (a) and 3 (b), the thermovalve 31 has the spring 35 extended and the spring 37 contracted so that the valve body 36 moves toward the valve hole. The communication portion 32 is closed.

In this state, the lubricating oil supplied by the oil pump of the engine E is led out from the first oil passage b through the outlet c and supplied to the oil cooler 10 through the hose 11. The lubricating oil air-cooled by the oil cooler 10 is returned to the return port d through the other hose 12 and supplied to the second oil passage e and the oil filter 23 in the storage portion 16. Therefore, the lubricating oil is greatly cooled by the air cooling effect by the oil cooler 10 and supplied to each part of the engine E.
In this manner, the lubricating oil flowing through the lubricating oil line can be circulated and supplied to the oil cooler 10 via the take-out port c and the return port d.

  As described above, according to this structure, the oil outlets c and the oil return return port d can be easily obtained by utilizing the storage portions 16 of the oil filters 13 and 23 provided in the crankcase cover 6. And can be provided. For this reason, it is possible to easily attach the oil cooler 10 and to add a thermostat function. That is, as described above, the lid 14 of the oil filter storage portion 16 of the crankcase cover 6 mounted in advance is removed, and the takeout port c and the return port d, the first oil passage b and the second oil passage b are removed. The thermostat function and the oil cooler can be easily mounted by replacing the cover member 21 having the above-described configuration equipped with the oil passage e and the communication portion 32 and the like.

Further, by providing the cover member 21 with the take-out port c and the return port d for the oil cooler 10, the first oil passage b and the second oil passage e, the communication portion 32 and the like, the thermostat 30 The cover member 21 and the crankcase cover 6 are firmly fixed to the engine E integrally.
For this reason, unlike the case where the thermostat 40 of the conventional example is interposed in the middle of the hose, it is less likely that the thermostat is broken or damaged due to vibration during traveling or collision with a foreign object or the engine body. Further, the thermostat 30 is housed in a cover member 21 fixed to the crankcase cover 6 so that the appearance of the engine E and the whole motorcycle becomes smart.

  Moreover, since the thermostat 30 is detachable with respect to the cover member 21 of the crankcase cover 6, only the thermostat 30 can be easily replaced even if a malfunction occurs. At the time of this replacement, it is only necessary to replace the thermo valve 31 constituting the thermostat 30 without attaching or detaching the hoses 11 and 12, so that it is not necessary to touch the oil cooler 10 or its connecting hoses 11 and 12 at all. It is.

Further, in this replacement work, for example, oil remaining in the core of the oil cooler or in the connection hose after the engine is stopped may fall toward the oil pan 3 when the thermostat 30 is removed.
At this time, according to this oil line take-out structure, since the opening for attaching the thermo valve of the thermostat 30 is upward, it is possible to suppress a large amount of lubricating oil from leaking from the opening.

  When the thermostat function is unnecessary, the thermo valve 31 is removed, a predetermined bolt is attached, and the opening of the cover member 21 is closed liquid-tightly.

DESCRIPTION OF SYMBOLS 1 Outlet 2 Return port 3 Oil pan 4 Cylinder block 5 Crankcase 6 Crankcase cover 7 Outbound oil path 8 Return oil path 10 Oil coolers 11, 12 External oil path (hose)
13 Oil filter 14 Lid 15 Elastic member 16 Storage part 16a End wall 20 Oil line take-out unit 21 Cover member 21a Cover part 21b Thermo storage part 22 Holding member 22a Partition part 22b Base part 22c, 22d O-ring 22e Protrusion part 22f Connection hole 22g Recess 23 Oil filter 23a Flow hole 23b Filter portion 23c O-ring 30, 40 Thermostat (thermo valve unit)
31, 41 Thermo valve 32, 42 Communication part (short circuit route)
33, 34 Connection pipe 35, 37 Spring 36 Valve body a Outer space b First oil passage c Extraction port d Return port e Second oil passage f Inner space D Oil passage (oil line)
E Engine F frame

Claims (6)

The engine (E) includes a crankcase cover (6) for closing the side surface of the crankcase (5), and the crankcase cover (6) has a storage section (16) for a lubricating oil line and oil filters (13, 23). And the lubricating oil line includes a forward oil passage (7) leading to the storage portion (16) and a return oil passage (8) drawn from the storage portion (16). The space in (16) is separated from the outside of the crankcase (6) by a cover member (21), and the space in the storage part (16) is divided into an inner space (f) and an outer space (a). A holding member (22) having a cylindrical partition wall portion (22a) is provided so that the oil filter (23) can be stored in the inner space (f), and the forward oil passage (7) is connected to the inner space (f). ) Or the outer space (a) On the other hand, the communicated the return oil passage (8) to the other of said inner space (f) or said outer space (a),
The cover member (21) is formed with an outlet port (c) for leading out oil to the oil cooler (10) and a return port (d) for returning oil from the oil cooler (10). 21), a first oil passage (b) connecting one of the inner space (f) or the outer space (a) and the outlet (c), and the inner space (f) or the outer space ( a second oil passage (e) connecting the other of a) and the return port (d) is formed, and the lubricating oil line is connected to the lubricating oil line via the take-out port (c) and the return port (d). An oil line take-out structure for an oil cooler characterized in that the circulating lubricating oil can be circulated and supplied to the oil cooler (10).   The first oil passage (b) and the second oil passage (e) are communicated with each other through a communicating portion (32), and the communicating portion (32) senses an oil temperature of a certain temperature or more to communicate with the communicating portion. The oil line take-out structure for an oil cooler according to claim 1, further comprising a thermostat (30) that closes (32) and senses an oil temperature below a certain temperature to open the communication part (32). .   The holding member (22) includes a base portion (22b) that engages with the crankcase cover (6) at the back of the storage portion (16), and the partition wall portion (22a) has an inner end in the cylinder axis direction. Is fixed to the base portion (22b), and the outer end in the cylinder axis direction is closed by the cover member (21), thereby separating the inner space (f) from the outer space (a). The oil line take-out structure for an oil cooler according to claim 1 or 2, wherein The oil filter (23) includes a cylindrical filter portion (23b) and end face members that close both ends in the cylinder axial direction, and the end face member is provided with a circulation hole (23a) for lubricating oil. The base portion (22b) includes a connection portion (22f) that connects the flow hole (23a) of the oil filter (23) and the forward oil passage (7) or the return oil passage (8). The oil line take-out structure for an oil cooler according to claim 3, wherein (22f) is inserted into the flow hole (23a). The base portion (22b) includes a recess (22g) facing the back side of the storage portion (16), and the forward oil passage (7) or the return oil passage (8) is inserted into the recess (22g). The oil line take-out structure for an oil cooler according to claim 4 , wherein the connecting portion (22f) faces the concave portion (22g). Claims 1 to 5 for an engine (E) that is not provided with an oil outlet (c) for extracting oil to the oil cooler (10) and an outlet (d) for returning oil from the oil cooler (10). An oil line take-out structure for an oil cooler that adds the oil line take-out structure for an oil cooler according to any one of
The engine (E) includes a crankcase cover (6) for closing the side surface of the crankcase (5), and the crankcase cover (6) has a storage section (16) for a lubricating oil line and oil filters (13, 23). And the lubricating oil line includes a forward oil passage (7) leading to the storage portion (16) and a return oil passage (8) drawn from the storage portion (16). The space in (16) is separated from the outside of the crankcase (6) by a lid (14), and the oil filter (13) housed in the housing part (16) is a cylindrical filter part (13b). And an end face member that closes both ends in the cylinder axis direction, the end face member is provided with a flow hole (13a) for lubricating oil, and the forward oil passage (7) or the Return oil passage (8) Cage Marete,
The lid (14) is removed, the holding member (22) is provided in the space in the storage part (16), the oil filter (23) is stored in the inner space (f), and the cover member (21 ) To close the storage portion (16), thereby adding an oil outlet lead (c) to the oil cooler (10) and an oil return inlet (d) from the oil cooler (10). Construction method of oil line take-out structure for oil cooler.

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