JP3149667B2 - Engine oil pump mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump mounting structure for an engine, and more particularly to a seal for an oil supply port to which oil discharged from an oil pump is supplied. The present invention relates to an oil pump mounting structure for an engine which can be prevented from seizing with the conventional oil pump and can be mounted in a conventional space without increasing costs and the number of parts.

[0002]

2. Description of the Related Art An engine is provided with an oil pump for lubricating various parts of a sliding engine and for cooling various parts of the engine which become hot. The oil pump is driven by a crankshaft to supply oil in an oil pan, and performs lubrication and cooling of various parts of the engine.

FIGS. 7 to 9 show an oil pump mounting structure for such an engine. In FIG. 9, 102 is an engine, 104 is a cylinder block, 1
06 is a crankcase, 108 is an oil pan, and 110 is an oil pump. In the engine 102, a crankcase 106 is mounted on a cylinder block 104 to support a crankshaft 112, and an oil pan 108 is mounted on the crankcase 106.
The oil pump 110 is mounted on the 08 side. Reference numeral 114 denotes a timing sprocket.

FIG. 7 and FIG.
, The crankshaft center line C1 of the crankshaft 112
Side wall portions 116 are provided on both sides in a direction intersecting with the side walls. A plurality of crankshaft support portions 118 are provided between the side wall portions 116 on both sides in a direction intersecting the crankshaft center line C1.
116 is provided. Crankshaft shaft support 118
The crankshaft bearing 12 that supports the crankshaft 112
0 is provided.

[0005] An oil pump 110 is mounted on the crankcase 106 so as to be located between the uppermost crankshaft shaft support 118 and the second crankshaft support 118 in FIGS. The oil pump 110 includes an inner rotor 124 and an outer rotor 12 in a pump case 122.
6 is rotatably held, and the inner rotor 124 is provided with the pump shaft 12.
8 is attached. The pump shaft 128 is connected to the pump case 1
A pump shaft bearing 130 supports the pump shaft 122, and one end protrudes out of the pump case 122.

[0006] The oil pump 110 has a crankshaft 1
12 driven. A pump drive sprocket 132 is provided on the crankshaft 112. The oil pump 110 is provided with a pump shaft sprocket 134 on the pump shaft 128. Pump driven sprocket 132
The pump drive chain 136 is wound around the pump shaft sprocket 134.

[0007] The crankcase 106 is provided with an oil supply port 138 through which oil supplied by an oil pump 110 is supplied at the uppermost crankshaft support 118 in FIGS. 7 and 8. The refueling port 138 is connected to the cylinder block 104 by a refueling passage 140.

The crankcase 106 has first to third pump mounting holes 1 in which an oil pump 110 is mounted.
42-1 to 142-3 are provided. The first and second pump mounting holes 142-1 and 142-2 are provided in the crankshaft shaft support portion 118 so as to sandwich the oil supply port 138. The third pump mounting hole 126-3 is provided on the side wall 116 opposite to the second pump mounting hole 142-2 with the oil supply port 138 interposed therebetween.
It is provided in the vicinity.

The oil pump 110 is fitted with the first through third pump mounting holes 142-1 through 142-3.
The first to third pump side mounting holes 144 are formed in the pump case 122.
-1 to 144-3 are provided. Oil pump 110
Are the first to third pump side mounting holes 144-1 to 144-3.
First to third pump mounting bolts 146-1 to 146-
3 through the first to third pump mounting holes 142-1 to 14-1.
42-3 so that the crankcase 106
It is attached to and provided.

The oil pump 110 includes a crankshaft 112
The pump shaft 128 is driven via the pump drive sprocket 132 and the pump shaft sprocket 134 and the pump drive chain 136, and the oil in the oil pan 108 is supplied by the rotation of the inner rotor 124 and the outer rotor 126. The supplied oil is supplied from the oil supply port 138 to the cylinder block 104 via the oil supply passage 140, and after lubricating and cooling each part of the engine 102, is returned to the oil pan 108.

An example of such an oil pump mounting structure is disclosed in Japanese Patent Application Laid-Open No. 4-166601. The mounting structure disclosed in this publication is such that an oil pump is mounted on a side wall of a crankcase and a crankshaft supporting portion mounted on a cylinder block.

The mounting structure of the oil pump is as follows:
There is one disclosed in Japanese Utility Model Publication No. 60-18562.
The mounting structure disclosed in this publication has an oil passage that guides the entire amount of oil supplied by an oil pump to an internal passage of the crankcase in a support bracket that supports a balancer shaft that rotates in conjunction with the crankshaft on the lower surface of the crankcase. Is provided.

Further, the mounting structure of the oil pump is as follows:
There is one disclosed in Japanese Utility Model Laid-Open No. 2-131007.
In the mounting structure disclosed in this publication, a front case having a flow passage communicating with an oil passage of a cylinder block is provided at a front end portion of the cylinder block, and one end portion of the front case is formed with a flange at an inlet side of the flow passage of the front case. And an oil pipe connected at the other end to the discharge port side of the oil pump via an O-ring.

[0014]

Problems to be Solved by the Invention Incidentally, FIGS.
In the conventional oil pump mounting structure shown in FIG.
The oil pump 110 is mounted on the crankcase 106 at three mounting positions of the first to third pump mounting holes 142-1 to 142-3.

However, the mating surface 148 of the filler port 138
Is applied to the second pump mounting hole 142-2 provided close to one side with the oil supply port 138 interposed therebetween.
Since the third pump mounting hole 142-3 on the opposite side is provided at a separated position, the third pump mounting hole 142- is provided.
There is a problem that the surface pressure on the third side decreases.

For this reason, in the conventional mounting structure, the sealing performance of the mating surface 148 of the oil supply port 138 is reduced due to a decrease in surface pressure, and there is an inconvenience that the amount of lubrication decreases due to oil leakage, and insufficient lubrication and cooling. Has the disadvantage of adversely affecting engine performance.

In the conventional oil pump mounting structure shown in FIGS. 7 to 9, the tension of the pump drive chain 136 acts on the pump shaft 128 of the pump case 122, so that the pump case 122 and the pump shaft bearing 130
There is a problem that causes the deformation of.

For this reason, in the conventional mounting structure, the above-described oil supply port 138 is formed by the deformation of the pump case 122.
In addition, there is a disadvantage that the sealing performance of the mating surface 148 is deteriorated, and there is a disadvantage that the pump shaft bearing 130 is deformed to cause seizure between the pump shaft 128 and the pump shaft bearing 130.

Techniques for addressing such a problem include:
A sealing member such as a gasket or an O-ring may be interposed on the mating surface 148 of the refueling port 122, or the crankcase 10
It is conceivable that the number of mounting locations may be increased by adding a pump mounting hole to 6. However, interposing a seal member such as a gasket or an O-ring or increasing the number of mounting locations has a disadvantage of increasing costs and the number of parts.

[0020]

In order to eliminate the above-mentioned disadvantages, the present invention provides a cylinder block of an engine provided with a crankcase that supports a crankshaft, and an oil pan mounted on the crankcase. Provided,
In an engine oil pump mounting structure in which an oil pump driven by the crankshaft to feed oil in the oil pan is mounted on the crankcase, the oil pump is supplied to a crankshaft support of the crankcase. An oil supply port for supplying oil to be supplied is provided,
First to third mounting holes for the oil pump, in which the oil pump is mounted, are provided on the crankcase so as to surround the oil supply port, and the first and second pump holes are sandwiched in a direction intersecting the centerline of the crankshaft. A pump mounting hole is provided in the crankshaft support, and one of the first and second pump mounting holes close to the oil supply port and a third pump mounting hole are used to form the pump mounting hole. These two so as to sandwich the filler port in the direction parallel to the centerline of the crankshaft
Two pump mounting holes are provided in the vicinity of the crankshaft support, and the two pump mounting holes are provided at positions opposite to each other in a direction parallel to the crankshaft center line of the oil supply port. A crank for pivotally supporting a crankshaft on a cylinder block of an engine, wherein the pump mounting hole is provided closer to the oil filler port than the other pump mounting hole of the two pump mounting holes which is separated from the oil filler port. An oil pump mounted on the crankcase, provided with an oil pan mounted on the crankcase, and an oil pump driven by the crankshaft to supply oil in the oil pan mounted on the crankcase; An oil supply port for supplying oil supplied by the oil pump to a crankshaft support of the crankcase. First to third mounting holes for the oil pump are provided in the crankcase so as to surround the oil supply port, and the first and third pump holes are sandwiched in a direction intersecting the centerline of the crankshaft. Second
A pump mounting hole is provided in the crankshaft support, and one of the first and second pump mounting holes close to the oil supply port and a third pump mounting hole are used to form the pump mounting hole. These two pump mounting holes are provided in the vicinity of the crankshaft support so that the filler port is sandwiched in a direction parallel to the crankshaft centerline, and these two pump mounting holes are parallel to the crankshaft centerline of the fuel filler port. The first and second pump mounting holes are provided closer to the oil supply port than the other one of the first and second pump mounting holes separated from the oil supply port. The pump has a pump shaft bearing centerline drawn in a direction crossing the pump shaft centerline, and a crankshaft bearing centerline drawn in a direction crossing the crankshaft centerline of the crankcase. The first to be located are allowed to overlap
It is characterized by being provided on the crankcase by a third pump mounting hole.

[0021]

According to the first aspect of the present invention, the first to third pump mounting holes are provided in the crankcase so as to surround the oil supply port, and the oil supply port is sandwiched in a direction intersecting the center line of the crankshaft. One of the first and second pump mounting holes provided near one of the oil supply ports and the third pump mounting hole are sandwiched between two pump mounting holes in a direction parallel to the crankshaft center line. The two pump mounting holes are provided in the vicinity of the crankshaft support portion, and are provided at positions opposite to each other in a direction parallel to the crankshaft center line of the oil supply port, and the first and second pump mounting holes are provided. The surface pressure acting on the mating surface of the oil supply port can be increased as compared with the related art, because the oil supply port is provided closer to the oil supply port than the other pump mounting hole that is separated from the oil supply port. According to the second configuration of the present invention, the center of the crankshaft bearing is drawn in a direction intersecting the centerline of the pumpshaft, and the centerline of the pumpshaft drawn in a direction intersecting the centerline of the crankshaft of the crankcase. The oil pump is mounted on the crankcase through the first to third pump mounting holes so as to overlap with the line, so that the pump case and the pump shaft bearing due to the tension of the pump drive chain acting on the pump shaft are provided. Deformation can be reduced. Further, according to the configuration of the present invention, the sealing property of the oil filler port can be improved, so that a sealing member such as a gasket or an O-ring is not required.
There is no need to add mounting holes for pumps to increase the number of mounting locations.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show an embodiment of the present invention. 5 and 6, 2 is an engine, 4 is a cylinder block, 6 is a crankcase, 8 is an oil pan, 10
Is an oil pump. In the engine 2, a crankcase 6 is mounted on a cylinder block 4 to support a crankshaft 12, an oil pan 8 is mounted on the crankcase 6, and an oil pump 10 is mounted on the oil pan 8 side of the crankcase 6. Reference numeral 14 is a timing sprocket.

As shown in FIGS. 1 and 2, the crankcase 6 has side wall portions 16 on both sides in a direction intersecting the crankshaft center line C1 of the crankshaft 12.
A crankshaft center line C1 is provided between these two side wall portions 16.
A plurality of crankshaft shaft supports 1
8 are provided and both side ends are connected to the side wall portions 16. The crankshaft shaft support portion 18 includes the crankshaft 12
Is provided. In this embodiment, the upper ends of the side wall portions 16 are connected to each other, and the lower ends are connected to both ends of the lowermost crankshaft support portion 18, respectively.

The crankcase 6 has an oil pump 10 located between the uppermost crankshaft support 18 and the second crankshaft support 18 in FIGS.
Is installed. The oil pump 10 rotatably holds an inner rotor 24 and an outer rotor 26 in a pump case 22 as shown in FIGS.
8 is attached. The pump shaft 28 is connected to the pump case 22.
, And has one end protruding out of the pump case 22.

The oil pump 10 includes a crankshaft 12
Driven by The crankshaft 12 is provided with a pump drive sprocket 32. In addition, the oil pump 10
Is provided with a pump shaft sprocket 34 on the pump shaft 28. A pump drive chain 36 is wound around the pump drive sprocket 32 and the pump shaft sprocket 34.

In the crankcase 6, an oil pump 10 is mounted on the uppermost crankshaft support portion 18 in FIGS.
An oil supply port 38 to which the oil to be supplied is supplied. The oil supply port 38 is communicated with the cylinder block 4 by an oil supply passage 40.

The crankcase 6 has first to third pump mounting holes 42-1 in which the oil pump 10 is mounted.
To 42-3. First and second pump mounting holes 4
Reference numerals 2-1 to 42-2 are provided on the crankshaft shaft support portion 18 so as to sandwich the fuel supply port 38. Third pump mounting hole 4
2-3 are the second pump mounting holes 42 with the oil supply port 38 interposed therebetween.
-2 is provided in the vicinity of the side wall 16 on the opposite side.

The oil pump 10 has first to third pump side mounting holes 44-1 to 44-4 in the pump case 22 so as to match the first to third pump mounting holes 42-1 to 42-3.
-3 is provided. In the oil pump 10, the first to third pump mounting bolts 46-1 to 46-3 are inserted into the first to third pump side mounting holes 44-1 to 44-3 to mount the first to third pumps. It is attached to the crankcase 6 by being screwed into the holes 42-1 to 42-3.

The oil pump 10 is connected to the pump shaft 2 via the pump drive sprocket 32 and the pump shaft sprocket 34 and the pump drive chain 36 by the crank shaft 12.
8 is driven and the oil in the oil pan 8 is supplied by the rotation of the inner rotor 24 and the outer rotor 26. The supplied oil is supplied from the oil supply port 38 to the cylinder block 4 via the oil supply passage 40, returns the oil to the oil pan 8 after lubricating and cooling each part of the engine 2.

As described above, the crankcase 6 for supporting the crankshaft 12 is mounted on the cylinder block 4 of the engine 2, and the oil pan 14 is mounted on the crankcase 6 and is driven by the crankshaft 12. In the mounting structure of the oil pump 10 of the engine 2 in which the oil pump 10 for supplying the oil in the oil pan 14 is mounted on the crankcase 6, the crankcase 6 is provided with the oil supplied by the oil pump 10. An oil supply port 38 to be supplied is provided, and first to third pump mounting holes 42-1 to 42-3 to which the oil pump 10 is attached are provided so as to surround the oil supply port 38.

First to third pump mounting holes 42-1 to 42
-3, the first and second pump mounting holes 42-1 and 42-2 are positioned on the uppermost crankshaft shaft so as to sandwich the oil supply port 38 in a direction intersecting the crankshaft center line C1 as shown in FIG. The first pump mounting hole 42-1 is provided on the support portion 18 and is spaced apart from the fuel supply port 38, and the second pump mounting hole 42-2 is provided close to the fuel supply port. A second pump mounting hole 42-2 is provided on one side in a direction parallel to the center line C1, and a second pump mounting hole 42-2 is provided on the other side in a direction parallel to the crankshaft center line C1 opposite to the second pump mounting hole 42-2. A mounting hole 42-3 for three pumps is provided. These first to third pump mounting holes 42-1 to 42-
3 is provided with at least two pump mounting holes close to the oil supply port 38. In this embodiment, as shown in FIG. 2, the first to third pump mounting holes 42-1 to 42-.
3, the second and third pump mounting holes 42-2, 42-.
Two of the three are provided close to the fuel supply port 38 so as to be located on opposite sides in a direction parallel to the center axis of the crankshaft with the fuel supply port 38 interposed therebetween.

As shown in FIG. 2, the first through third pump mounting holes 42-1 through 42-3 provided so as to surround the fuel supply port 38, as shown in FIG. First and second pump mounting holes 42-1 and 42-2 are provided in the crankshaft shaft support portion 18 so as to be sandwiched in the intersecting direction,
Of the first and second pump mounting holes 42-1 and 42-2, lubrication is performed by two of the second pump mounting hole 42-2 and the third pump mounting hole which are close to the oil supply port 38. These two second and third pump mounting holes 42- are sandwiched so that the port 38 is sandwiched in a direction parallel to the crankshaft center line C1.
The second and third pump mounting holes 42-2 and 42-3 are provided near the crankshaft shaft support portion 18.
Are provided opposite to each other in a direction parallel to the crankshaft center line C1 of the fuel supply port 38, and the two second and third pump mounting holes 42-2 and 42-3 are provided.
Is separated from the oil supply port 38 of the first and second pump mounting holes 42-1 and 42-2.
It is provided closer to the refueling port 38 than 2-1.

In such an attachment structure of the oil pump 10 of the engine 2, as shown in FIGS. 1, 2 and 6, the oil pump 10 extends in a direction intersecting the pump shaft center line C2 of the pump shaft 28. The pump shaft bearing center line C3 of the pump shaft bearing 30 depicted in FIG.
And is attached to the crankcase 6 by the first to third pump mounting holes 42-1 to 42-3. Provided.

That is, the oil pump 10 is mounted on the crankcase 6 so that the pump shaft bearing center line C3 is substantially co-linear with the crank shaft bearing center line C4.

Next, the operation will be described.

The oil pump 10 of the engine 2 includes a pump drive sprocket 32 and a pump shaft sprocket 3
4 is wound around a pump drive chain 36. As a result, the oil pump 10 is driven by the crankshaft 12 via the pump drive sprocket 34 and the pump shaft sprocket 34 and the pump drive chain 36 to supply the oil in the oil pan 8.

The oil supplied by the oil pump 10 is supplied from the oil supply port 38 through the oil supply passage 40 to the cylinder block 4.
After the lubrication and cooling of each part of the engine 2 are performed, the oil is returned to the oil pan 8.

The oil pump 10 includes a pump case 2
The first to third pump mounting bolts 46-1 to 46-3 are inserted into the first to third pump side mounting holes 44-1 to 44-3, and the first to third pump mounting bolts 46 are inserted. -1 to 4
6-3 is attached to the crankcase 6 by screwing it into the first through third pump mounting holes 42-1 through 42-3 of the crankcase 6.

These first to third pump mounting holes 42-1
To 42-3 are provided in the crankcase 6 so as to surround the fuel supply port 38, and the first to third pump mounting holes 42-1 to 4-4 are provided.
Second and third pump mounting holes 42-2-4 of 2-3
Two of 2-3 are provided close to the fuel supply port 38 so as to be located on opposite sides of the fuel supply port 38.

As described above, the lubrication port 3 is connected to the crankcase 6.
1 to 3 pump mounting holes 4 provided so as to surround
2-1 to 42-3 are used to connect the fuel supply port 38 to the crankshaft center line C.
The first and second pump mounting holes 42-1 and 42-2 are provided so as to be sandwiched in a direction intersecting with the first one, and the oil supply port 38 of the first and second pump mounting holes 42-1 and 42-2 is provided. The two shafts of the second pump mounting hole 42-2 and the third pump mounting hole 42-3, which are close to each other, are sandwiched in such a manner that the oil supply port 38 is sandwiched in a direction parallel to the crankshaft center line C1. 18, the two second and third pump mounting holes 42-2 and 42-3 are provided at positions opposite to each other in a direction parallel to the crankshaft center line C1 of the oil supply port 38, and the first and second pump mounting holes 42-2 and 42-3 are provided in the first direction.・ Second pump mounting hole 42-1
The other first of the nozzles 42-2 which is separated from the fuel supply port 38;
By providing the oil supply port 38 closer to the oil supply port 38 than to the pump mounting hole 42-1, the surface pressure acting on the mating surface 48 of the oil supply port 38 can be made higher and more uniform than before.

For this reason, according to the mounting structure of the oil pump 10, the surface pressure acting on the mating surface 48 of the oil supply port 38 can be increased, so that the sealing performance of the oil supply port 38 can be improved, and the oil supply amount can be improved. And the lubrication and cooling performance can be ensured, and the engine performance can be ensured.

The oil pump 10 is positioned so that the center line C3 of the pump shaft bearing overlaps the center line C4 of the crankshaft bearing, and the first to third pump mounting holes 42-1 to 42-3.
First to third pump mounting bolts 4 screwed into 42-3
It is attached to the crankcase 6 by 6-1 to 46-3.

As described above, the oil pump 10 has a crankshaft bearing centerline drawn in a direction intersecting the pump shaft centerline C2 and a pump shaft bearing centerline C3 drawn in a direction intersecting the crankshaft centerline C1. Positioned so as to overlap C4, the first to third pump mounting holes 42-1 to 42-3.
Is provided on the crankcase 6 by the three mounting portions described above, so that the pump case 22 is actuated by the force P due to the tension of the pump drive chain 36 acting on the pump shaft 28.
The pump shaft bearing 30 can be prevented from being deformed, and the deformation can be reduced.

Therefore, according to the mounting structure of the oil pump 10, the deformation of the pump case 22 can be reduced, so that the sealing performance of the oil supply port 38 can be improved.
Since the deformation of the pump shaft bearing 30 can be reduced, seizure between the pump shaft 28 and the pump shaft bearing 30 can be prevented.

Further, according to the structure of the present invention, the sealing performance of the fuel supply port 38 can be improved.
There is no need for a seal member such as a gasket or an O-ring to improve the sealability of the above, and there is no need to increase the number of mounting locations by adding a pump mounting hole.

Therefore, according to the oil pump 10 mounting structure, the oil pump 10 can be mounted in a conventional space without increasing the cost and the number of parts.

[0047]

As described above, according to the first configuration of the present invention, the first to third crankshafts surround the fuel supply port.
One of the first and second pump mounting holes, which is provided so as to sandwich the oil supply port in a direction intersecting the center line of the crankshaft, is provided near the oil supply port, and the third pump mounting hole is provided with a pump mounting hole. The two pump mounting holes are provided in the vicinity of the crankshaft shaft support so as to sandwich the filler port in a direction parallel to the crankshaft center line, and the two pump mounting holes are parallel to the crankshaft center line of the fuel filler port. And the first and second pump mounting holes are provided closer to the oil supply port than the other of the first and second pump mounting holes, which are separated from the oil supply port. The surface pressure acting on the surface can be higher than before.

For this reason, according to the oil pump mounting structure, the surface pressure acting on the mating surface of the oil filler can be increased, so that the sealing performance of the oil filler can be improved.
A decrease in the amount of refueling can be avoided, and lubrication and cooling performance can be ensured, and engine performance can be ensured.

Further, according to the second configuration of the present invention, the center of the crankshaft bearing is drawn in the direction intersecting the centerline of the pump shaft, and the centerline of the pumpshaft drawn in the direction intersecting the centerline of the crankshaft. The oil pump is mounted on the crankcase through the first to third pump mounting holes so as to overlap with the line, so that the pump case and the pump shaft bearing due to the tension of the pump drive chain acting on the pump shaft are provided. Deformation can be reduced.

Therefore, according to this oil pump mounting structure, the sealing performance of the oil supply port can be improved by reducing the deformation of the pump case, and the deformation of the pump shaft bearing can be improved by reducing the deformation of the pump shaft bearing. Seizure can be prevented.

Further, according to the structure of the present invention, the sealing property of the oil supply port can be improved, so that a sealing member such as a gasket or an O-ring is not required, and the number of mounting locations is increased by adding a pump mounting hole. No need to do.

For this reason, the mounting can be performed in the conventional space without increasing the cost and the number of parts.

[Brief description of the drawings]

FIG. 1 is a bottom view of a crankcase with an oil pump mounted thereon, showing an embodiment of an oil pump mounting structure according to the present invention.

FIG. 2 is a bottom view of the crankcase.

FIG. 3 is a front view of the oil pump.

FIG. 4 is a side view of the oil pump.

FIG. 5 is a front view in which a part of the engine is omitted.

FIG. 6 is a sectional view in which a part of an engine is omitted.

FIG. 7 is a bottom view of a crankcase with an oil pump attached, showing a conventional example of an oil pump attachment structure.

FIG. 8 is a bottom view of the crankcase.

FIG. 9 is a sectional view in which a part of the engine is omitted.

[Explanation of symbols]

 2 Engine 4 Cylinder block 6 Crankcase 8 Oil pan 10 Oil pump 12 Crankshaft 14 Timing sprocket 16 Side wall 18 Crankshaft shaft support 20 Crankshaft bearing 22 Pump case 24 Inner rotor 26 Outer rotor 28 Pumpshaft 30 Pumpshaft bearing 32 Pump Drive sprocket 34 Pump shaft sprocket 36 Pump drive chain 38 Oil supply port 40 Oil supply passage 42-1 to 42-3 Mounting holes for first to third pumps 44-1 to 44-3 Mounting holes for first to third pumps 46- 1-46-3 Mounting bolts for first to third pumps 48

Claims (2)

(57) [Claims] 1. A crankcase for supporting a crankshaft is mounted on a cylinder block of an engine, and an oil pan is mounted on the crankcase. The oil pan is driven by the crankshaft to supply oil in the oil pan. In an oil pump mounting structure for an engine in which an oil pump to be mounted is mounted on the crankcase, an oil supply port through which oil supplied by the oil pump is supplied is provided in a crankshaft support of the crankcase, and the crankcase is provided in the crankcase. A first to a third pump mounting hole in which the oil pump is mounted is provided so as to surround the oil supply port.
In the direction intersecting the crankshaft center line
First and second pump mounting holes are provided in the crankshaft support.
The oil supply of the first and second pump mounting holes.
Two pumps, one near the mouth and the third pump mounting hole
The lubrication port is flush with the crankshaft center line by the
Two pump pumps so that they are
A hole is provided in the vicinity of the crankshaft support, and these two
The pump mounting hole is parallel to the crankshaft center line of the oil filler
If they are located opposite to each other in the direction
The oil supply port of the first and second pump mounting holes
An oil pump mounting structure for an engine, wherein the oil pump mounting structure is provided closer to the oil supply port than the other pump mounting hole separated from the oil supply port. 2. A crankcase, which supports a crankshaft, is mounted on a cylinder block of an engine. An oil pan is mounted on the crankcase. The oil pan is driven by the crankshaft to supply oil in the oil pan. In an oil pump mounting structure for an engine in which an oil pump to be mounted is mounted on the crankcase, an oil supply port through which oil supplied by the oil pump is supplied is provided in a crankshaft support of the crankcase, and the crankcase is provided in the crankcase. A first to a third pump mounting hole in which the oil pump is mounted is provided so as to surround the oil supply port.
In the direction intersecting the crankshaft center line
First and second pump mounting holes are provided in the crankshaft support.
The oil supply of the first and second pump mounting holes.
Two pumps, one near the mouth and the third pump mounting hole
The lubrication port is flush with the crankshaft center line by the
Two pump pumps so that they are
A hole is provided in the vicinity of the crankshaft support, and these two
Parallel to the crankshaft center line of the fuel supply port of Tsukeana preparative pump
If they are located opposite to each other in the direction
The oil supply port of the first and second pump mounting holes
The oil pump has a pump shaft bearing center line drawn in a direction intersecting with a pump shaft center line, the pump shaft bearing center line being drawn in a direction crossing the pump shaft center line. An oil pump mounting structure for an engine, wherein the oil pump mounting structure is provided so as to overlap with a crankshaft bearing center line drawn in a direction intersecting with the crankcase and to be mounted on the crankcase through the first to third pump mounting holes. .