JP2694359B2 - Oil-cooled engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine, and more particularly to an engine cooling device.

[Conventional technology]

Engine cooling systems include an air cooling system using traveling wind as a medium, a water cooling system using cooling water as a medium, and an oil cooling system using engine lubricating oil as a medium.

In this oil-cooled engine, a recess is formed in the cylinder head in the vicinity of the periphery of the combustion chamber, and lubricating oil for the oil pan is supplied to this recess so that the heat generated in the combustion chamber is absorbed by this lubricating oil. ing.

[Problems to be solved by the invention]

By the way, in the engine cooling device as described above, since the lubricating oil is supplied only to the cylinder head, the entire engine cannot be uniformly cooled, and the cooling effect of the cylinder head may be impaired. is there.

In view of the above situation, an object of the present invention is to provide an engine that can improve the cooling effect.

[Means for solving the problem]

In the present invention, the recess 16 formed in the upper portion of the combustion chamber 17 provided in the cylinder head 13 between the inlet valve 14 and the exhaust valve 15 and the cam on the inlet valve side of the cylinder head 13 A lubricating oil supply passage 25 that opens to the shaft bearing portions 28 and 29, communicates with the recess 16 through the injection hole 27, and has its base end opened to the outside of the cylinder head 13.
On the exhaust valve side of the cylinder head 13, one end of which communicates with the recess 16 and the other end of which is opened to the cylinder block mounting surface, the lubricating oil discharge passages 23, 24, 26, 32; (101) and a plurality of recessed grooves (7, 8) surrounding the cylinder liner (6) are formed between the cylinder liner (6) fitted in the cylinder block (1), and the lubricating oil is applied to the plurality of recessed grooves (7, 8). A space 11 for cooling the cylinder liner 6 by pumping O, one end of which is opened at a position where it is connected to the lubricating oil discharge passages 23, 24, 26, 32 on the cylinder head mounting surface, and the other end of which is a crankcase. A main gallery 3 opened at 34, a lubricating oil return passage 4 (104) communicating between the void 11 and the main gallery 3, and on the opposite side of the main gallery 3 with the cylinder liner 6 in between. , One end is the sky The lubricating oil supply hole 5 (105) having the other end opened to the outside of the cylinder block 1 (101) and the lubricating oil O stored in the crankcase 34,
An oil pump 35 that pressure-feeds to an oil cooler 37 via a strainer 36 and a branch from the oil cooler 37, and the supply hole 5 (10
5) The first branch supply passage d reaching the other end and the oil cooler 37 are branched, and the lubricating oil supply passage
An oil-cooled engine having a second branch supply passage c leading to the base end of 25, when the lubricating oil O in the crankcase 34 is pumped to the oil cooler 37 by the operation of the oil pump 35. , The lubricating oil O cooled by the oil cooler 37 is branched into two, and one of them is divided into the first branch supply passage d and the supply hole 5.
It is pressure-fed into the space 11 between the cylinder liner 6 and the cylinder block 1 (101) via (105) to cool the cylinder liner 6 and then the return passage 4 (104) and the main gallery 3 It is returned to the crankcase 34 via the other, and the other of the two branched lubricating oil O is pressure-fed to the lubricating oil supply passage 25 via the second branch supply passage c and then further branched into two. Through the injection hole 27
To the crankcase 34 through the lubricating oil discharge passages 23, 24, 26, 32 and the main gallery 3, while the lubricating oil O that has been injected into The other of the lubricating oil branched in the supply passage 25 is supplied to the camshaft bearing portions 28 and 29, and the lubricating oil O that lubricates the bearing portions 28 and 29 is passed through the cam chain chambers 38 and 39 to the crankcase 34. I will send it back to you.

[Action]

According to the above configuration, the lubricating oil for cooling is supplied to the cylinder head and the cylinder block via separate branch supply paths.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.

FIG. 1 conceptually shows an oil-cooled engine according to the present invention. This engine is mounted on a motorcycle and has a bore 2 in a cylinder block 1 thereof. As shown in FIG. 3 and FIG. 4, the bore 2 is composed of a hole 2a opened on the upper and lower surfaces 1a and 1b of the cylinder block 1 and an annular recess 2b formed on the outer periphery of the upper end of the hole 2a. Has been done.

The cylinder block 1 has a main gallery 3 outside the bore 2. The main gallery 3 is open to the upper and lower surfaces 1a and 1b of the cylinder block 1, and the upper part thereof is inserted into the bore 2 through a communication passage (lubricant oil return passage) 4. Communication passage 4 is bore 2
The hole was drilled from the top opening of the
It is inclined toward the opening of the bore 2.

Further, the cylinder block 1 has a supply hole 5 in the lower part thereof. One end of the supply hole (lubricating oil supply hole) 5 is opened in the bore 2 and extends substantially horizontally from the bore 2 in the radial outward direction, and the other end is opened in the side wall of the cylinder block 1. .

In this cylinder block 1, as shown in FIG.
A cylinder liner 6 is fitted in the bore 2. As shown in FIG. 4, the cylinder liner 6 has a flange 6a at the upper end.
And has an outer peripheral surface of the cylindrical portion 6b.
A plurality of concave grooves 7, 7,... Are formed in 6c. These concave grooves 7, 7 are annular, and are connected to each other by vertical grooves 8, 8 ... formed along the axial direction of the cylinder liner 6. As is clear from the figure, the groove 7 located at the lowermost stage of the cylinder liner 6 is independent of the grooves 7, 7,... A ring 9 is fitted.

The cylinder liner 6 is fitted into the bore 2 of the cylinder block 1 by a cold fit, and the cylindrical portion 6b has a hole.
2a, and the flange 6a is fitted into the recess 2b.

In this state, as shown in FIG. 1, the outer circumference of the cylinder 10 in the cylinder block 1 is defined by the concave grooves 7, 7 ... And the vertical grooves 8, 8 ... In the cylinder liner 6 and the hole 2a in the bore 2 in the cylinder block 1. A void 11 is defined in the entire area, the void 11 is communicated with the main gallery 3 by a communication passage 4, and the void 11 is opened to a side wall of the cylinder block 1 by a supply hole 5.

A cylinder head 13 is attached to the upper surface 1a of the cylinder block 1 configured as described above via a gasket 12.

Although not shown in the drawing, the cylinder head 13 is provided with one cam shaft above the central portion, and two in-red valves 14 and two exhaust valves 15 operated by the cams of this cam shaft. ing.

Further, the cylinder head 13 has a recess 16 on its upper surface. The recessed portion 16 is arranged above the combustion chamber 17 at a portion located between the inlet ports 18 and 18 and the exhaust ports 19 and 19, and its opening is closed by a lid 20. The lid 20 has a substantially U-shaped cross section, and is fixed to the cylinder head 13 by fastening a bolt 22 to a columnar portion 21 provided upright in the recess 16.

As shown in FIG. 2, the recess 16 is communicated with the stud bolt insertion holes (lubricant oil discharge passages) 24, 24 through a pair of communication passages (lubricant oil discharge passages) 23, 23. One end of each of the communication passages 23, 23 opens at the bottom of both ends of the recess 16, and the other end of the communication passage 23, 23 inclines downward from there, as shown in FIG. 1
After passing through the vicinity of 5 and the periphery of the exhaust ports 19 and 19, they are opened to the insertion holes 24 and 24.

The cylinder head 13 also has a supply pipe (lubricating oil supply passage) 25 and a connection exhaust passage (lubricating oil exhaust passage) 26.

The supply pipe 25 includes the inlet ports 18 and 18 and the recess 1 described above.
It is embedded so as to be parallel to a camshaft (not shown) at a position located between the cylinder head and one end.
The side wall of 13 is open and the other end is closed, and as shown in FIG. 2, its central portion communicates with the recess 16 through a plurality of injection holes 27, 27 ... In addition, from the supply pipe 25, the bearing portions 28, 2 of the cam shaft (not shown)
Lubricating passages 30 and 31 opening to 9 are also branched.

As shown in FIG. 1, the connection / exhaust passage 26 is provided with the supply pipe 25 at a position below the exhaust ports 19, 19.
It is formed so as to be parallel to. This connection drainage passage 26
Connects the stud bolt insertion holes 24, 24 in which the communication passages 23, 23 are open to each other, and further, through the communication discharge passage (lubricant oil discharge passage) 32, the cylinder block 1 of the cylinder block 1 on the bottom surface of the cylinder head 13. Main gallery 3
The opening corresponding to the opening is provided.

The gasket 12 interposed between the cylinder head 13 and the cylinder block 1 is provided with notches 12a and 12b at the portion corresponding to the cylinder 10 and the portion corresponding to the opening of the main gallery 3, respectively. There is.

On the other hand, a crankcase 34 is attached to the lower surface 1b of the cylinder block 1 via a gasket 33.

The crankcase 34 has a box shape for storing the lubricating oil O therein, and an opening 34a is formed over a portion of the upper surface thereof corresponding to the openings of the cylinder 10 of the cylinder block 1 and the main gallery 3.

Further, the crankcase 34 has an oil pump 35 inside. The oil pump 35 has its suction port 35
a is connected to a strainer 36 immersed in the lubricating oil O via a pipe a such as a pipe, and its discharge port 35b is connected to an oil cooler 37 via a pipe b such as a pipe.

The oil cooler 37 is arranged outside the crankcase 34, and has a discharge port 37a and a pipe line (second branch supply passage) c for communicating with the supply pipe 25 of the cylinder head 13. , And a pipe line (first branch supply passage) d that connects the supply hole 5 of the cylinder block 1 to each other.

Now when you start this engine, the oil pump
35 is driven, and the lubricating oil O stored in the crankcase 34 is sucked through the strainer 36.

The lubricating oil O sucked by the oil pump 35, after being cooled by the oil cooler 37, is branched into one pumped to the pipe line c and one pumped to the pipe line d.

The lubricating oil O in the pipe line c is pressure-fed to the supply pipe 25 of the cylinder head 13 and further supplied there to the bearing portions 28 and 29 via the lubrication passages 30 and 31, and the injection holes 27, 27. It is branched to the one that is jetted and supplied into the concave portion 16 through.

The lubricating oil O supplied to the bearings 28 and 29, after lubricating the camshaft (not shown), leaks from the lubricating oil O and is guided to the upper surface of the cylinder head 13.
It is returned into the crankcase 34 via the cam chain chamber 38 of 13 and the cam chain chamber 39 of the cylinder block 1.

On the other hand, the lubricating oil O pressure-fed from the injection holes 27, 27 ... into the recess 16 has the periphery of the combustion chamber 17 in the cylinder head 13, the periphery of the inred valves 14, 14 and the exhaust valves 15, 15 in the recess 16. After absorbing the heat of the surroundings and cooling these parts, they are sequentially fed under pressure to the communication passages 23, 23, the stud bolt insertion holes 24, 24 and the connection discharge passage 26. During this time, the lubricating oil O cools the periphery of the exhaust ports 19, 19 in the cylinder head 13.

The lubricating oil O pressure-fed to the connection drain passage 26 is connected to the communication drain passage 32.
And is returned to the inside of the crankcase 34 through the notch 12b of the gasket 12 and the main gallery 3 of the cylinder block 1.

On the other hand, the lubricating oil O in the pipe line d is pumped into the space 11 via the supply hole 5 of the cylinder block 1. The lubricating oil O pumped into the space 11 is guided to the entire outer circumference of the cylinder 10 along the concave grooves 7, 7 ... And the vertical grooves 8, 8 ..., and absorbs heat around the cylinder 10 in the cylinder block 1. And cool it.

When the lubricating oil O in the space 11 is pressure-fed to the upper groove 7 in the cylinder liner 6, the lubricating oil O is supplied to the communication passage 4
To the crankcase 34 via the main gallery 3.

In this oil-cooled engine as described above, the oil cooler 37
Through the conduit d and the supply hole 5 from the crankcase 34
The lubricating oil O in the cylinder block 1 is directly supplied to the empty space 11, and the lubricating oil O supplied to the empty space 11 through the communication passage 4 and the main gallery 3 is further supplied to the crankcase 34.
The first branch cooling path is returned to the cylinder block 1 during operation of the oil-cooled engine.
Is constantly being cooled, and the lubricating oil O in the crankcase 34 is directly supplied to the recess 16 of the cylinder head 13 from the oil cooler 37 through the pipe line c, the supply pipe 25, and the injection holes 27, 27. Further, the lubricating oil O supplied to the recess 16 through the communication passages 23, 23, the stud bolt insertion holes 24, 24, the connection discharge passage 26, the equalization discharge passage 32, and the main gallery 3 is returned to the crankcase 34. A branched cooling path is formed, so that the cylinder head 13 is always cooled during the operation of the oil-cooled engine.

Moreover, from the supply pipe 25 to the camshaft bearings 28, 29
Lubricating oil O is branched and supplied to the cam chain chambers 38, 39
A lubricating path for returning the lubricating oil O supplied to these camshaft bearings 28, 29 to the crankcase 34 through the above is formed, whereby the lubrication of the valve train is always achieved during the operation of the oil-cooled engine. Become.

In the above embodiment, the supply hole 5 is provided in the lower portion of the cylinder block 1 and the communication passage 4 is provided in the upper portion of the cylinder block 1 so that the lubricating oil O is pumped from the lower side to the upper side of the cylinder 10. However, the present invention is not limited to this. For example, as shown in the modified example of FIG.
A supply hole (lubricant oil supply hole) 105 is provided in the upper portion of the cylinder block 101, and a communication passage (lubricant oil return passage) 104 is provided.
Is provided in the lower part of the cylinder block 101 and the lubricating oil O is pressure-fed from the upper side to the lower side of the cylinder 10, it is possible to improve the cooling effect above the cylinder 10 which becomes a higher temperature state. In the modification of FIG. 5, the same components as those of the engine shown in the previous embodiment are designated by the same reference numerals.

Further, in the above embodiment, the cylinder liner 6 is provided with the grooves 7 and 8, and the groove 7 and 8 and the cylinder block 1 form the void 1
1, but in the present invention, the cylinder block 1
The groove may be provided to define the void, or the groove may be provided to both to define the void.

Further, the groove is composed of a plurality of annular recessed grooves 7, 7 ... And vertical grooves 8, 8 ... Connecting these recessed grooves 7, 7 ... With each other, but the present invention is not limited to this. Instead, it may be a spiral groove, for example.

〔The invention's effect〕

As described above, according to the oil-cooled engine of the present invention, since the lubricating oil is supplied to the cylinder head and the cylinder block, the engine can be cooled uniformly and the effect thereof can be improved. it can.

Moreover, the cylinder head and the cylinder block are
Since the lubricating oil is directly supplied from the separate supply passages, the respective lubricating oils are not affected by the heat of the other, and the optimal amount of the lubricating oils can be supplied to the respective coolings.

[Brief description of the drawings]

FIG. 1 is a sectional view conceptually showing an oil-cooled engine according to the present invention, and FIG. 2 is a top view of a cylinder head portion applied to the oil-cooled engine according to the present invention, FIGS. 3 and 4. The figure shows a cylinder block portion applied to an oil-cooled engine according to the present invention. Fig. 3 is a top view, Fig. 4 is an exploded side sectional view, and Fig. 5 is an oil-cooled engine according to the present invention. It is sectional drawing which showed the modification of notionally. 1,101 …… Cylinder block, 3 …… Main gallery, 4 (104) …… Communication passage, 5 (105) …… Supply hole, 6
...... Cylinder liner, 7,8 ...... Groove, 11 ...... Vacancy, 13 ...
… Cylinder head, 14 …… Inlet valve, 15 …… Exhaust valve, 16 …… Recess, 17 …… Combustion chamber, 23 ……
Communication passage, 24 ... Stud bolt insertion hole, 25 ... Lubricating oil supply passage, 26 ... Connection discharge passage, 27 ... Injection hole, 28, 29 ...
… Camshaft bearing part, 32 …… communication drainage passage, 34 …… crankcase, 35 …… oil pump, 36 …… strainer,
37 …… Oil cooler, 38,39 …… Cam chain chamber, O…
… Lubricant, c, d …… Pipelines.

Claims (1)

(57) [Claims] 1. An inlet valve 14 and an exhaust valve in an upper portion of a combustion chamber 17 provided in a cylinder head 13.
A recess 16 formed in a portion sandwiched between 15 and an inlet valve side of the cylinder head 13,
It opens in the camshaft bearings 28 and 29, and the injection hole 2
A lubricating oil supply passage 25 communicating with the recess 16 through 7 and having a base end opened to the outside of the cylinder head 13, and an exhaust valve side of the cylinder head 13 having one end communicating with the recess 16. , Between the lubricating oil discharge passages 23, 24, 26, 32 having the other end opened to the cylinder block mounting surface, and between the cylinder block 1 (101) and the cylinder liner 6 fitted to the cylinder block 1 (101). A plurality of recessed grooves 7 and 8 surrounding the cylinder liner 6 are formed, and a cavity 11 for cooling the cylinder liner 6 by pumping the lubricating oil O into the plurality of recessed grooves 7 and 8; Between the main gallery 3 which is opened at the position where it is connected to the lubricating oil discharge passages 23, 24, 26, 32 on the mounting surface and the other end is opened to the crankcase 34, and between the space 11 and the main gallery 3. Lubricating oil return passage 4 in communication (104) and the main gallery 3 with the cylinder liner 6 interposed therebetween.
The lubricating oil supply hole 5 (105) having one end opened to the space 11 and the other end opened to the outside of the cylinder block 1 (101), and inside the crankcase 34. An oil pump 35 that pressure-feeds the stored lubricating oil O to an oil cooler 37 via a strainer 36 and a branch from the oil cooler 37, and the supply hole 5 (105)
A first branch supply passage d reaching the other end of the oil cooler 37 and the lubricating oil supply passage 25 branched from the oil cooler 37.
An oil-cooled engine having a second branch supply passage c extending to the base end of the crankcase by the operation of the oil pump 35.
When the lubricating oil O in 34 is pressure-fed to the oil cooler 37, the lubricating oil O cooled by the oil cooler 37 is branched into two, one of which is the first branch supply passage d and the supply hole 5
It is pressure-fed into the space 11 between the cylinder liner 6 and the cylinder block 1 (101) via (105) to cool the cylinder liner 6 and then the return passage 4 (104) and the main gallery 3 It is returned to the crankcase 34 via the other side, and the other of the two branched lubricating oil O is pressure-fed to the lubricating oil supply passage 25 via the second branch supply passage c and then further branched into two. Is injected into the recess 16 through the injection hole 27, and the lubricating oil O that has cooled the periphery of the recess 16 is passed through the lubricating oil discharge passages 23, 24, 26, 32 and the main gallery 3 to the crankcase. While returning to the lubricating oil supply passage 25, the other of the lubricating oil branched in the lubricating oil supply passage 25 is supplied to the camshaft bearing portions 28 and 29, and the lubricating oil O that lubricates the bearing portions 28 and 29 is supplied to the cam chain chamber 38. Return to crankcase 34 via An oil-cooled engine characterized by this.