JP2003003816A - Water pump structure for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump structure, capable of efficiently feeding cooling water and a lubricating oil into each part of an engine by installing a circulating passage of the lubrication oil in a water pump case arranged at almost the center part of a cylinder block. SOLUTION: The oil passage part 82 with a hollow shape providing a first oil passage communicating with a main oil passage 2b of the cylinder block is integrally formed, in the water case storing the water pump. The oil passage part 82 has a second oil passage part 83 communicating with an coil control valve of a variable valve timing mechanism and a third oil passage part 84 communicating with an oil passage 2d feeding the lubricating oil into the cylinder head. After the lubricating oil fed from the main oil passage 2b flows in the oil passage 82 in the water pump case 80, each part of the engine can be lubricated from each oil passage parts 83, 84 by feeding it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump case having an oil circulation path for supplying lubricating oil to various parts of an engine.

[0002]

2. Description of the Related Art A conventional water pump case equipped with a water pump will be described with reference to FIG. In the V-type engine 1, primary side and secondary side cylinder heads 5 and 6 are arranged above the primary side and the secondary side cylinder banks 3 and 4, respectively. The engine bank is constructed. Primary side cylinder head 5
On both sides of the primary intake and exhaust camshafts 10, 1
1 is provided for the primary side intake and exhaust camshafts 10,
Cam sprockets 12 and 13 are fixed to 11, respectively. In addition, the primary side intake and exhaust camshaft 10,
Primary idler sprocket 1 almost downward between 11
4 and a primary side idler shaft 16 provided with a cam chain sprocket 15. Here, the primary side intake cam sprocket 12, the primary side exhaust cam sprocket 13, and the primary side cam chain sprocket 15
The primary side cam chain 17 is wound around. Similarly, the secondary side cylinder head 6 is provided with secondary side intake and exhaust camshafts 20 and 21 on both sides, and the secondary side intake and exhaust camshafts 20 and 21 are provided with cam sprockets 22. , 23 are fixed respectively. Further, a secondary side timing chain sprocket 24 is fixed to the secondary side intake camshaft 20. A secondary cam chain 25 is wound around the secondary intake cam sprocket 22 and the secondary exhaust cam sprocket 23.

Further, the cylinder block 2 is provided with a center side idler shaft 30 between the primary side and the secondary side cylinder banks 3 and 4, and the center side idler shaft 3 is provided.
The center idler sprocket 31 is fixed to 0. Further, a crankshaft 40 is arranged substantially below the cylinder block 2, and the crank sprocket 4
1 and an oil pump chain sprocket (not shown) are fixed. The oil pump chain 42 is
The oil pump sprocket 44 of the oil pump 43,
An oil pump chain sprocket (not shown),
Is wrapped around. The timing chain 50 is wound around the crank sprocket 41, the primary idler sprocket 14, the center idler sprocket 31, and the secondary timing chain sprocket 24. The chain cover 70 includes the primary cam chain 17
, Secondary side cam chain 25, timing chain 5
It is arranged so as to cover 0 and the like.

On the front surface of the V-type engine thus arranged, the water pump case 60 is in contact with the cylindrical storage portion 60A for storing the water pump 61 in the center and the one end surface 2a of the cylinder block 2. Insertion hole 60 for inserting the four mounting bolts 62 for fixing
A mounting flange portion 60B provided with a to 60d is integrally formed. In addition, the water pump case 60 is
Inside the timing chain 50, below the center side idler sprocket 31 from the secondary side cylinder bank 4, the four mounting bolts 62 are inserted into the mounting bolt insertion holes 60a to 60d of the mounting flange portion 60B. do it,
The cylinder block 2 is fixed by being screwed into a corresponding water pump case mounting hole (not shown) formed in the one end surface 2a of the cylinder block 2.

The idler shaft 30 on the center side,
A linear main oil passage 2b extending in the axial direction of the crankshaft 40 is provided in the cylinder block 2 at substantially the center between the crankshaft 40 and the one end surface 2a of the cylinder block 2. In addition, the insertion hole 60 of the mounting flange 60B of the water pump case 60
A part of the mounting flange 60B that connects b and 60c is disposed so as to overlap with the opening of the main oil passage 2b that is provided so as to penetrate the one end surface 2a of the cylinder block 2. This opening is closed by a stopper screw 2c.

An oil pump 4 driven by the crankshaft 40 is provided in a linear main oil passage 2b extending in the axial direction of the crankshaft 40 in the cylinder block 2.
Lubricating oil is supplied by pressure from 3.

As a prior art relating to the positional relationship between the position of the water pump attached to the cylinder block and the oil passage in the cylinder block in the V type engine, Japanese Utility Model Laid-Open No. 3-51116 discloses a cylinder of the V type engine. In the block, a water pump is mounted on the front surface of the cylinder block so as to project from a central V-shaped space to form a wall. The cooling water passage in the cylinder block is formed from the upper end of the protruding wall portion to the protruding wall portion and the wall portion immediately below the protruding wall portion. Further, the oil gallery is provided in parallel with the crankshaft, and in the projecting wall portion, a V-type engine is provided in which a downwardly sloping oil gallery is provided through from the rear end to the front end of the projecting wall. Cylinder block structures are disclosed.

Further, in Japanese Patent Laid-Open No. 6-10668,
In a V-type engine, a linear main oil passage opening extending in the axial direction with the crankshaft is formed in the cylinder block by penetrating one end surface of the cylinder block, and is arranged in the vicinity of the main oil passage opening. Disclosed is a water pump mounting structure in which an opening closing portion that closes an opening of a main oil passage is formed in a water pump case provided with a water pump to be installed.

Further, Japanese Patent Laid-Open No. 1-277611 discloses a V-type engine in which a main oil gallery extending in the axial direction of the crankshaft and a sub gallery are provided in the cylinder block, and the main oil gallery is the cylinder block. There is disclosed a lubrication device for a V-type engine that does not extend to one end surface of the cylinder block and does not interfere with the main oil gallery even if a water pump chamber is formed on one end surface of the cylinder block. .

[0010]

As described above, the water pump case provided with the water pump and the opening of the main oil passage that penetrates one end surface of the cylinder block are arranged in an overlapping manner. In particular, when the engine has a complicated oil path such as an engine with a variable valve (VVT) mechanism, the position of the main oil passage in the cylinder block is changed in order to supply the lubricating oil to each part of the engine. There is a need. Further, in this case, it is necessary to newly provide an oil passage to the side of the chain cover and to provide an oil supply pipe or the like for connecting the main oil passage and the oil control valve outside the engine. As described above, when the position of the main oil passage in the cylinder block is changed, the cylinder block is generally manufactured by using a mold. Therefore, when the cylinder block is newly designed and manufactured, a considerable cost may be incurred. There is a nature. Further, the number of related parts such as a new oil supply pipe increases, and the cost burden increases.

Further, in the conventional engine in which the circulation path of the lubricating oil and the circulation path of the cooling water are independently arranged, the parts and the like related to the respective circulation paths are arranged in duplicate. However, the space occupied by the engine increases, and it becomes difficult to make the entire engine compact.

Further, in the case of an engine of a type having a pair of left and right banks, as in the case of a V type engine,
In order to supply cooling water and lubricating oil evenly to each bank, a linear main oil passage extending parallel to the axial direction of the crankshaft is arranged in the center of the cylinder block, and the water pump is also installed in the cylinder block. It is desirable to dispose it at approximately the center. The present invention has been made in view of the above points, and a circulation path for lubricating oil is provided in a water pump case disposed substantially in the center of a cylinder block to efficiently supply cooling water and lubricating oil to each engine. An object is to provide a water pump structure of an engine that can be supplied to a part.

[0013]

As a means for solving the above problems, the present invention as set forth in claim 1 is as follows.
In a water pump structure of an engine in which a main oil passage extending in the axial direction of a crankshaft is provided in a cylinder block of an engine, and a water pump is attached to an end surface of the cylinder block, the main oil passage is provided in the cylinder block. And an opening that opens to the end surface of the cylinder block. The water pump case of the water pump covers the opening of the main oil passage and forms an oil passage that communicates with the main oil passage. It is characterized by having an oil passage. With this configuration, the water pump case has a substantially central portion of the cylinder block so that the main oil passage extending parallel to the axial direction of the crankshaft in the cylinder block covers the opening provided therethrough. Since the main oil passage and the oil passage in the water pump case communicate with each other through the oil passage portion, the lubricating oil flows from the main oil passage in the cylinder block to the opening portion. Through the oil passage portion of the water pump case, flows into the oil passage, and is supplied from this oil passage to each part of the engine. Further, since the circulation path (oil passage) for the lubricating oil is provided in the water pump case, the existing cylinder block can be used without changing the position of the main oil passage provided in the cylinder block. There is no need to manufacture a new cylinder block. Furthermore, since the circulation path of the lubricating oil and the circulation path of the cooling water are integrated, the number of parts related to each circulation path can be reduced, the exclusive space can be reduced, and the entire engine can be made compact. . Further, even in the engine of the type having a pair of left and right banks as in the case of the V-type engine, the cooling water and the lubricating oil can be evenly supplied to each bank.

In the invention described in claim 2, in the invention described in claim 1, the oil passage of the water pump case includes a plurality of oil passage portions including an oil passage portion communicating with the main oil passage. At least one oil passage portion of the plurality of oil passage portions is closed by a stopper. With this configuration, the lubricating oil in the main oil passage of the cylinder block flows into the oil passage through the oil passage portion communicating with the main oil passage, and the plurality of other oil passages branched from this oil passage are provided. Supplied to each part of the engine.

According to a third aspect of the present invention, in the invention according to the second aspect, at least one oil passage portion of the plurality of oil passage portions is an oil passage portion that supplies oil to the variable valve timing mechanism. It is characterized by being. With this configuration, the lubricating oil is supplied to the variable valve timing mechanism from one oil passage portion branched from the oil passage. Further, also in an engine with a variable valve (VVT) mechanism having a complicated oil path, it is possible to use an existing cylinder block without changing the position of the main oil passage in the cylinder block.

According to a fourth aspect of the invention, in the invention according to the second or third aspect, at least one oil passage portion of the plurality of oil passage portions passes through the inside of the cylinder block to form a cylinder. It is characterized in that it is an oil passage portion for supplying oil to the head.
With this structure, the lubricating oil is supplied to the cylinder head from one oil passage portion branched from the oil passage, through the inside of the cylinder block.

The invention described in claim 5 is the invention according to claims 2 to 4.
In any one of the inventions described above, a positioning member is provided in the oil passage portion communicating with the oil passages of the cylinder block and the chain cover among the plurality of oil passage portions. With this configuration, the plurality of oil passage portions formed in the oil passage of the water pump case and the oil passages of the cylinder block and the chain cover can be easily connected and communicated with each other.

The invention described in claim 6 is defined by claims 1 to 5.
In any one of the inventions described above, the water pump case is arranged inside a transmission member wound between a crankshaft and a camshaft or an idler shaft, and the cylinder block and the chain cover are provided. It is characterized in that it is arranged between.
With this configuration, the water pump case having the oil passage can be arranged by effectively utilizing the limited space in the engine, so that the entire engine becomes compact.

The invention described in claim 7 is the invention according to claims 1 to 6.
In the invention described in any of 1,
It is a V-type engine. With this configuration, the lubricating oil flows from the main oil passage of the cylinder block into the oil passage of the water pump case arranged in the substantially central portion of the cylinder block, and the oil passage opposes the V-type engine from this oil passage. It is evenly supplied to a pair of left and right banks.

The engine water pump structure according to the present invention is basically constructed as described above, but this structure can be applied to other than the water pump case. For example, an oil pump case including an oil pump may be integrally formed with a water passage including a plurality of water passage portions, and a cooling water circulation path may be provided in the oil pump case.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water pump structure for an engine according to an embodiment of the present invention will be described with reference to FIGS.
It will be described in detail based on. In the description of the embodiments of the present invention, the same members as those in the conventional example will be described using the same reference numerals. As shown in FIG. 1, in the V-type engine 1, the timing chain 50 includes the crankshaft 4
Crank sprocket 41 fixed to 0, primary idler sprocket 14 fixed to primary idler shaft 16, center idler sprocket 31, and secondary side timing chain fixed to secondary side intake camshaft 20. The sprocket 24 is wound around and arranged. In the V-type engine 1 thus arranged, as shown in FIGS. 1 and 4, the water pump case 80 including the water pump 61 is arranged inside the timing chain 50 which is a transmission member. Further, it is located from the secondary side cylinder bank 4 to below the center side idler sprocket 31, and is further disposed in the space between the cylinder block 2 and the chain cover 70.
Mounting bolt insertion holes 80a to 80f of the mounting flange 80B
Then, the six mounting bolts 87 are inserted and screwed into the corresponding water pump case mounting holes (not shown) in the one end surface 2a of the cylinder block 2 to be fixed.

Therefore, the water pump case 80 for housing the water pump 61 will be described in detail. As shown in FIGS. 2 and 3, the water pump case 80 includes a housing portion 80A for housing the water pump 61 and a mounting flange 8 that abuts on one end surface 2a of the cylinder block 2.
0B, and a substantially cylindrical oil passage body 80C is integrally formed with the mounting flange 80B.
Further, the mounting flange 80B has flange-shaped leg portions projecting from the periphery of the storage portion 80A, and has insertion holes 80a to 80f through which the mounting bolts 87 are inserted at the end portions of the respective flange-shaped leg portions. Further, the oil passage body 80C is surrounded by the through holes 80c, 80d, 80e and 80f provided in the mounting flange 80B of the water pump case 80,
Located between the insertion holes 80d and 80e, the storage portion 80A
And is integrally formed with the mounting flange 80B. Further, the oil passage portion main body 80C includes the cylinder block 2
It is formed in a substantially cylindrical shape except for the surface that contacts the chain cover 70. Further, the oil passage portion main body 80C has an oil passage 82, and the first oil passage portion 81 formed at one end portion of the oil passage 82 has an axial center of the crankshaft 40 in the cylinder block 2. A straight main oil passage 2b having an opening 2A extending in parallel with the direction and penetrating one end face 2a of the cylinder block 2.
Is in communication with. Further, the oil passage 82 supplies the lubricating oil to the second oil passage portion 83 communicating with the oil control valves 90 and 94 constituting the variable valve timing mechanism and the cylinder heads 5 and 6.
It has a third oil passage portion 84 communicating with d. Further, an oil passage portion 85 having a screw hole is provided at the other end portion of the oil passage 82 and is closed by a stopper screw 86.

As shown in FIG. 3, the first oil passage portion 8
A positioning pin 81a for communicating with the opening 2A of the corresponding cylinder block and for positioning is fitted to 1. Further, the second oil passage portion 83 is fitted with a positioning pin 83a that communicates with the corresponding opening 70A of the chain cover 70 and positions the second oil passage portion 83. Then, these positioning pins 81a and 83a are
It is formed in a hollow shape to allow the lubricating oil to flow therethrough. Further, in order to prevent oil leakage between the water pump case 80 and the cylinder block 2, the O-rings 81b, 83b and 84b are provided in the first to third oil passage portions 81, 83 and 84 of the water pump case 80. First to form the groove portion 81c, 83c and 84c to be mounted,
Corresponding to the third oil passage portions 81, 83 and 84,
The O-rings 81b, 83b and 84b are mounted, respectively. Then, the water pump case 80 has the respective groove portions 81.
O-rings 81b, 8 on c, 83c and 84c, respectively.
Positioning pins 81a and 8 fitted in the first and second oil passage portions 81 and 83 with the 3b and 84b attached.
Each of the 3a is inserted into the opening 2A provided in the corresponding cylinder block 2 and the opening 70A provided in the chain guide 70, and the insertion hole 8 for the mounting bolt is formed.
The mounting bolt 87 is inserted through 0a to 80f and fixed to the cylinder block 2.

Next, the flow of the lubricating oil supplied from the main oil passage 2b in the cylinder block 2 to each part of the engine will be described. First, the lubricating oil is pumped from the oil pump 43 and supplied to the main oil passage 2b of the cylinder block 2. Then, as shown in FIGS. 2 and 3, the lubricating oil in the main oil passage 2b of the cylinder block 2 passes through the first oil passage portion 81 and is supplied to the oil passage 82 of the oil passage portion main body 80C. It
One of the lubricating oils flowing into the oil passage 82 is supplied to the oil control valve 90 of the variable valve timing mechanism through the second oil passage portion 83, the oil passage 70b in the chain cover 70, and the union. It is supplied to the oil control valve 94 of the variable valve timing mechanism through the oil passage portion 92a of the bolt 92 and the oil passage 93a in the oil supply pipe 93. The other of the lubricating oil that has flowed into the oil passage 82 passes through the third oil passage portion 84, passes through the oil passage 2d in the cylinder block 2, and then the primary side,
It is supplied to the secondary side cylinder heads 5 and 6.

As described above, the oil passage part branched from the oil passage integrally formed with the water pump case is connected to the oil control part of the variable valve timing mechanism and the oil passage part connected to the cylinder head. Although a case has been described in which the number of lubricating oils is one, an appropriate number of oil passage portions can be provided depending on the number of parts for supplying lubricating oil.

[0026]

As described above, according to the invention described in claim 1, the water pump case is provided with the main oil passage extending through in parallel with the axial direction of the crankshaft in the cylinder block. The main oil passage of the cylinder block is arranged so as to contact the end face of the substantially central portion of the cylinder block so that the main oil passage communicates with the oil passage portion in the water pump case so as to cover the opening. The lubricating oil supplied from the passage is
The oil can be supplied to each part of the engine through the opening of the main oil passage, the oil passage of the water pump case, the oil passage in the water pump case, and the oil passage. Further, since the circulation path (oil passage) for the lubricating oil is provided in the water pump case, the existing cylinder block can be used without changing the position of the main oil passage provided in the cylinder block. There is no need to manufacture a new cylinder block. Furthermore, since the lubricating oil circulation path and the cooling water circulation path are integrated, the number of parts related to each circulation path is reduced, the space occupied by each part is reduced, and the engine as a whole is made compact. be able to. Further, even in the engine of the type having a pair of left and right banks as in the case of the V-type engine, the cooling water and the lubricating oil can be supplied to each bank evenly.

According to the second aspect of the invention, since the plurality of oil passage portions are provided in the oil passage in the water pump case, the lubricating oil in the main oil passage of the cylinder block communicates with the main oil passage. After passing through the oil passage, it flows into the oil passage of the water pump case,
It is possible to supply and lubricate each portion of the engine from a plurality of oil passage portions formed by branching from the oil passage.

According to the invention described in claim 3, since the oil passage portion for supplying the lubricating oil from the oil passage in the water pump case is provided to the variable valve timing mechanism, the lubricating oil is the oil of the water pump case. Since oil can be supplied to the variable valve timing mechanism from an oil passage portion formed by branching from the passage for lubrication, even in an engine with a variable valve (VVT) mechanism having a complicated oil passage, the main oil passage in the cylinder block The existing cylinder block can be used without changing the position. Therefore, the cost of manufacturing a new cylinder block is unnecessary.

According to the invention described in claim 4, since the oil passage portion for supplying the lubricating oil to the cylinder head is provided from the oil passage in the water pump case through the inside of the cylinder block, the lubricating oil is The oil can be supplied to the cylinder head for lubrication from an oil passage formed by branching from the oil passage of the pump case.

According to the fifth aspect of the present invention, the plurality of oil passage portions formed in the oil passage of the water pump case are provided with the positioning members for communicating with the oil passages of the cylinder block and the chain cover. The plurality of oil passage portions and the oil passages of the cylinder block and the chain cover having different mounting directions can be easily connected to communicate with each other.

According to the invention described in claim 6, the water pump case is inside the timing chain wound between the crankshaft and the camshaft or the idler shaft, and the cylinder block and the chain cover. Since the water pump case having the oil passage can be arranged by effectively utilizing the limited space in the engine, the entire engine can be made compact.

According to the invention described in claim 7, the lubricating oil is pumped from the main oil passage in the substantially central portion of the cylinder block to the oil passage formed in the water pump case arranged in the central portion of the cylinder block. As a result, the oil passages can be uniformly supplied to the left and right banks of the V-type engine, so that the lubricating oil circulation path and the cooling water circulation path can be compactly arranged even in the case of the V-type engine. it can.

[Brief description of drawings]

FIG. 1 is a front view of a V-type engine including a water pump structure according to an embodiment of the present invention.

FIG. 2 is a view showing the water pump case and the oil control valve of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a diagram showing an arrangement state of the water pump case of FIG.

FIG. 5 shows a V equipped with a conventional water pump structure.
It is a front view of a type engine.

[Explanation of symbols]

1 V engine 2 cylinder block 2a end face 2b Main oil passage 2A, 70A opening 40 crankshaft 50 timing chain 61 Water pump 70 Chain cover 80 water pump case 80A storage 80B mounting flange 80C oil passage body 80a-80f insertion hole 81 First oil passage 82 Oil passage 83 Second oil passage 84 Third oil passage portion 81a, 83a Positioning pin

Claims (7)

[Claims] 1. A water pump structure for an engine, wherein a main oil passage extending in an axial direction of a crankshaft is provided in a cylinder block of the engine, and a water pump is attached to an end surface of the cylinder block. Is provided with an opening penetrating the cylinder block and opening to an end surface of the cylinder block, and the water pump case of the water pump is
A water pump structure for an engine, comprising: an oil passage that covers an opening of the main oil passage and has an oil passage portion that communicates with the main oil passage. 2. The oil passage of the water pump case includes a plurality of oil passage portions including an oil passage portion communicating with the main oil passage, and at least one oil passage portion of the plurality of oil passage portions is provided. The water pump structure for an engine according to claim 1, wherein the water pump structure is closed by a stopper. 3. The water pump for an engine according to claim 2, wherein at least one oil passage portion of the plurality of oil passage portions is an oil passage portion that supplies oil to the variable valve timing mechanism. Construction. 4. The oil passage portion of at least one of the plurality of oil passage portions is an oil passage portion for supplying oil to a cylinder head through the inside of the cylinder block. The engine water pump structure described in. 5. A positioning member is provided in an oil passage portion communicating with the oil passages of the cylinder block and the chain cover among the plurality of oil passage portions. The water pump structure for the engine according to any one of the above. 6. The water pump case is arranged inside a transmission member wound between a crankshaft and a camshaft or an idler shaft, and is arranged between the cylinder block and a chain cover. It is provided, The water pump structure of the engine in any one of Claims 1-5 characterized by the above-mentioned. 7. The water pump structure for an engine according to claim 1, wherein the engine is a V-type engine.