JP2828647B2 - V-type engine cylinder block structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a pair of banks arranged in a V-shape on the left and right as viewed from the crankshaft direction, and the right and left banks are displaced from each other in the crankshaft direction Are related to a cylinder block structure of a V-type engine.

[Conventional technology]

Conventionally, in a V-type engine, a main oil gallery is formed so as to extend in the crankshaft direction at a portion between the left and right banks in a cylinder block, and the main oil gallery is formed on an outer portion of one of the two banks. A sub-oil gallery extending parallel to the main oil gallery and communicating with the oil filter is formed, and a communication passage connecting the sub-oil gallery and the main oil gallery is provided. The oil from the oil pump is supplied to the sub-oil gallery and the communication passage. In addition, the oil is supplied to a sliding portion between the crankshaft and the cylinder block via the main oil gallery.

On the other hand, conventionally, as a cylinder block structure of an engine, there has been known a cylinder block structure in which an upper block and a lower block integrally formed with a bearing cap are fastened with bolts (Japanese Patent Application Laid-Open No. Sho 60/1985).
-219436 gazette). That is, in this structure, a plurality of bearing caps corresponding to each journal portion of the crankshaft are formed of an iron alloy, and a lower block is formed by casting the bearing cap with an aluminum alloy. Is fastened to the lower end of the upper block with a plurality of bolts to form a cylinder block.

[Problems to be solved by the invention]

According to the cylinder block structure described above, there are the following problems when applied to a V-type engine.

That is, in the V-type engine, since the piston sliding direction of each bank is inclined at a predetermined angle with respect to the vertical direction, the explosion load of the cylinder of each bank acts obliquely downward of the crankshaft. The characteristic is that the horizontal component force due to the explosion load of the cylinder is larger than that of the in-line type engine. The horizontal component force due to the explosion load of the cylinder acts as a force for shifting the upper block and the lower block in the cylinder block structure. Therefore, when the above-mentioned cylinder block structure is applied to the V-type engine, the force for shifting the upper block and the lower block from each other becomes larger than that of the in-line engine. For this reason, if the cylinder block is configured as in the case of the in-line type engine, it is difficult to obtain a sufficient fixing force between the upper block and the lower block, and the lower block is laterally shifted with respect to the upper block. This may adversely affect the smooth rotation of the crankshaft.

In addition, in the V-type engine, the cylinders of the left and right banks are necessarily displaced from each other in the crankshaft direction. Therefore, depending on the arrangement of the lubricating oil passage, the arrangement space for the cylinder and the lubricating oil passage increases in the crankshaft direction, and There is a concern that the size will increase.

In view of the above circumstances, the present invention provides a cylinder block structure of a V-type engine in which a cylinder block is formed by an upper block and a lower block, without increasing the weight and increasing the size of the upper block and the lower block. The fastening force between the blocks can be increased,
An object of the present invention is to provide a cylinder block structure of a V-type engine that can prevent the lower block from being shifted laterally with respect to the upper block.

[Means for solving the problem]

The cylinder block structure of the V-type engine according to the first aspect includes an upper block having banks arranged in a V-shape on the left and right as viewed from the crankshaft direction and arranged with cylinders shifted from each other in the crankshaft direction, and a bearing cap. A cylinder block is formed by fastening bolts to a lower block that is formed in an intended manner, and a V-type engine in which a main oil gallery is provided so as to extend in the crankshaft direction at a portion of the upper block located between the left and right banks. In the cylinder block structure, a sub oil gallery extending in parallel with the main oil gallery is provided on an outer portion of one of the banks where the cylinder is shifted away from the end on the transmission mounting side of the upper block. Formed in the bank on the one side of the upper block. A communication passage connecting the sub oil gallery and the main oil gallery is provided at an end on the mounting side, and a portion where the upper block has a screw hole for the bolt and the communication passage intersects with the sub oil gallery is provided. And a boss for forming a screw hole having a continuous leading end.

The cylinder block structure of the V-type engine according to the second aspect is configured such that an upper block provided with banks arranged in a V-shape on the left and right as viewed from the crankshaft direction and arranged with cylinders shifted from each other in the crankshaft direction, and a bearing cap are integrated. In a cylinder block structure of a V-type engine in which a cylinder block is formed by fastening a lower block formed by bolts with a bolt, the cylinder of the two banks is moved away from the end of the upper block on the transmission mounting side. A screw hole forming boss having a screw hole for the bolt is provided at an end of the shifted bank on the transmission mounting side, and the upper block and the lower block are bolted at least at this portion. It is.

[Action]

According to the configuration of the first aspect of the present invention, the screw portion forming boss provided in the upper block is supported by the communication passage and the sub oil gallery, and the rigidity of the screw V-type engine forming boss is improved. As a result, the fastening force between the upper block and the lower block is increased.

According to the configuration of the invention according to claim 2, a boss is provided at the end of the one bank on the transmission mounting side, and the upper and lower blocks are bolted at this portion, so that the other bank is connected to the other bank. The fastening rigidity of the two blocks is increased with respect to the horizontal component force applied by the explosion load of the cylinder near the transmission mounting side of the block.

〔Example〕

1 to 3 show one embodiment of a cylinder block structure of a V-type engine according to the present invention.

In these figures, reference numeral 1 denotes a cylinder block, which is composed of an upper block 2 and a lower block 3. These upper block 2 and lower block 3
The lower block 3 and the lower block 3 are combined so that the lower surface of the upper block 2 and the upper surface of the lower block 3 are aligned with each other, and are fastened by bolts 4 at a plurality of locations described later. Each journal portion of the crankshaft 7 is formed by a plurality of bearing caps 5 formed integrally with the lower block 3 and a plurality of iron alloy bearing members 6 arranged at the lower part of the upper block so as to face the bearing caps 5. Are rotatably supported. The crankshaft 7 is adapted to rotate in the direction of arrow A in FIG.

The lower block 3 is formed by casting a plurality of bearing caps 5 made of an iron alloy at a predetermined interval in the direction of the crankshaft 7 with a light alloy such as an aluminum alloy.

On the other hand, the upper block 2 is made of a light alloy such as an aluminum alloy, and has upper banks 8 and 9 arranged in a V-shape on the left and right when viewed from the crankshaft 7 direction. A flange 21a to which a transmission (not shown) is attached is formed at one end 21 of the upper block 2 in the direction of the crankshaft 7. The cylinders of the left and right banks 8, 9 are shifted from each other in the direction of the crankshaft 7, whereby a space 11 is formed at the end 21 of the bank 9 of the upper block 2 on the transmission mounting side (the side on which the flange 21a is formed). A space 10 is formed at the end of the bank 8 of the upper block 2 opposite to the transmission mounting side. The pistons 71 of the cylinders arranged in the banks 8 and 9 are connected by connecting rods.
It is connected to a crankpin 73 of the crankshaft 7 via 72.

A main oil gallery 22 is provided at a portion of the upper block 2 located between the left and right banks 8 and 9 so as to extend in the direction of the crankshaft 7. A sub-oil extending in parallel with the main oil gallery 22 is provided on the outer portion of the bank 9 in which the cylinder is shifted away from the end 21 on the transmission mounting side of the upper block 2 in the two banks 8, 9. A gallery 23 is formed.
The main oil gallery serves as a passage for guiding oil sent from the oil pump to the main oil gallery.
A communication path 24 connecting the 22 and the sub oil gallery 23 is formed. The communication path 24 is provided in the space 11 formed at the end 21 of the bank 9 of the upper block 2 on the transmission mounting side. Then, an oil pump (not shown) is connected to the sub oil gallery 23, and the oil is supplied from the oil pump to the sub oil gallery 23, so that the oil from the oil pump passes through the communication passage 24 to the main oil gallery 22. The oil is supplied from the main oil gallery 22 to a sliding portion between the crankshaft 7 and the bearing cap 5 and the bearing member 6 via an oil passage (not shown). Therefore, the oil from the oil pump can be smoothly supplied to the sliding portion between the crankshaft 7 and the bearing cap 5 and the bearing member 6 with a simple structure.

A plurality of screw holes 41 into which the screws of the bolts 4 are screwed are formed on the lower surface of the upper block 2, and the upper block 2 and the lower block 3 are fastened by the bolts 4 at these screw hole 41 formation locations. One of the screw holes 41 is formed on the lower surface on the bank 9 side at the end of the upper block 2 on the transmission mounting side, and a screw hole forming boss 43 for forming the screw hole 41 is connected to this portion. The tip is connected to a portion 25 where the passage 24 and the sub oil gallery 23 intersect. For this reason, the screw hole forming boss 43 is supported by the intersection 25 having increased rigidity due to the intersection of the communication passage 24 and the sub oil gallery 23, and the rigidity is increased.

By the way, in the configuration of the cylinder block structure, since the cylinders of the bank 8 are displaced so as to approach the end 21 of the upper block 2 on the transmission mounting side, the bearings provided at the end 21 of the upper block 2 on the transmission mounting side are provided. A horizontal component force due to the explosion load of the cylinder closest to the transmission mounting side of the bank 8 is mainly applied to the cap 5 and the bearing member 6. For this reason, the bearing cap 5 and the bearing member 6 provided at the end 21 of the upper block 2 on the transmission mounting side have the cylinder 9 shifted toward the bank 9 away from the end 21 of the upper block 2 on the transmission mounting side. Large force acts.

In the configuration of the cylinder block structure, as described above, the boss 43 for forming a screw hole is provided so as to connect the tip portion to the intersection 25 between the communication passage and the sub oil gallery 23. With this configuration, the sub oil gallery 23 is provided on the bank 9 side, and the communication path 24 is provided in the space 11 formed at the end 21 of the upper block 2 on the transmission mounting side. The hole forming boss 43 is inevitably provided in the bank 9 at the end 21 on the transmission mounting side of the upper block 2.
Provided on the side. That is, the screw hole forming boss 43 is provided at a portion where the horizontal component force due to the explosive load of the cylinder acts particularly greatly. As a result, the part where the horizontal component force due to the explosive load of the cylinder acts particularly large
It can be fastened by the bolt 4 screwed into the screw hole 41 of the screw hole forming boss 43 having increased rigidity. Therefore,
The fastening force between the upper block 2 and the lower block 3 can be increased so as to sufficiently oppose the large force in the portion where the horizontal component force is particularly large due to the explosion load of the cylinder. It is possible to prevent the lower block 3 from laterally shifting with respect to the upper block 2 due to a horizontal component force due to the load.

In addition, since the cylinders of the left and right banks 8, 9 are displaced from each other, the communication passage 24 is provided in the space 11 at the end of the upper block 2 on the transmission mounting side, which is a dead space due to the transmission being mounted. A portion where the rigidity is likely to be reduced due to the presence of the space portion 11 can be reinforced by the passage wall of the communication passage 24. Further, since the rigidity of the screw hole forming boss 43 is increased by using the communication path 24, it is not necessary to separately provide reinforcement or the like to increase the rigidity of the screw hole forming boss 43. In addition, it is possible to prevent the weight of the cylinder block 1 from increasing and the cylinder block 1 from increasing in size.

In the above embodiment, the screw holes 41 are arranged such that the number of the screw holes 41 is larger on one bank 8 side than on the other bank 9 side by the number of the screw holes 41 formed in the screw hole forming boss 43. However, the screw holes 41 may be provided so that the number of the screw holes 41 is equal on both sides. In the above embodiment, the cylinders of the bank 9 may be shifted closer to the end on the transmission mounting side, and the cylinders of the bank 8 may be shifted away from the end on the transmission mounting side. However, in this case, the sub oil gallery 23 is provided on the bank 8 side, and the space 11 in which the communication path 24 is provided is provided on the end of the bank 8 on the transmission mounting side.

〔The invention's effect〕

In the cylinder block structure for a V-type engine according to the first aspect, a screw hole forming boss having a screw hole of a bolt in the upper block and a leading end portion continuing at a portion where the communication passage intersects with the sub oil gallery is provided. Therefore, the screw hole forming boss is supported by the communication passage and the sub oil gallery, and its rigidity is improved, and as a result, the fastening force between the upper block and the lower block is increased. In addition, a communication path is provided in a dead space portion of the end of the upper block on the mission mounting side of the bank, which is shifted away from the end of the upper block on the transmission mounting side, and a screw hole forming boss is formed by utilizing the communication path. Since the rigidity of the threaded portion is improved, it is not necessary to separately provide a reinforcing rib or the like in order to improve the rigidity of the screw portion forming boss. Therefore, lateral displacement of the lower block with respect to the upper block can be reliably prevented without increasing the weight or size of the cylinder block.

In the cylinder block structure of a V-type engine according to claim 2, the cylinder is shifted from the end of the upper block on the transmission mounting side of the upper block to the end of the one bank on the transmission mounting side. Since a boss for forming a screw hole is provided, and the upper block and the lower block are bolted at least at this portion, the horizontal component force applied by the explosion load of the cylinder near the transmission mounting side of the other block is reduced. On the other hand,
The combination of the two blocks can be enhanced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a cylinder block structure of a V-type engine according to the present invention, FIG. 2 is a bottom view of an upper block thereof, and FIG. It is sectional drawing. 1 ... cylinder block, 2 ... upper block, 3 ...
... Lower block, 4 ... Bolt, 5 ... Bearing cap,
7 ... Crankshaft, 8,9 ... Bank, 11 ... Space formed at the end of the upper block on the transmission mounting side, 22
… Main oil gallery, 23… Sub oil gallery, 24… Communication passage, 25… A part where the communication passage intersects with the sub oil gallery, 43… Boss for forming screw holes for bolts.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01M 1/06 F02F 7/00 301

Claims (2)

(57) [Claims] An upper block provided with banks arranged in a V-shape on the left and right as viewed from the crankshaft direction and arranged with cylinders shifted from each other in the crankshaft direction, and a lower block integrally formed with a bearing cap. In the cylinder block structure of a V-type engine in which a main oil gallery is provided so as to extend in the crankshaft direction at a portion between the left and right banks in the upper block, A sub-oil gallery extending parallel to the main oil gallery is formed on an outer portion of the one bank in which the cylinder is shifted away from the end of the upper block on the transmission mounting side, and the one side of the upper block is formed. At the end of the bank on the transmission mounting side, And a communication passage connecting the main oil gallery and the upper block, the upper block has a screw hole forming boss having a screw hole of the bolt, and a leading end portion connected to a portion where the communication passage intersects with the sub oil gallery. A cylinder block structure for a V-type engine, wherein the cylinder block structure is provided. 2. A bolt comprising: an upper block having banks arranged in a V-shape on the left and right as viewed from the crankshaft direction and arranged with cylinders offset from each other in the crankshaft direction; and a lower block integrally formed with a bearing cap. In the cylinder block structure of the V-type engine in which the cylinder block is formed by fastening the cylinder block, the cylinder is shifted from one end of the upper bank on the mission mounting side of the upper block, and the transmission mounting of one bank is performed. A screw hole forming boss having a screw hole for the bolt is provided at an end on the side, and the upper block and the lower block are bolted at least at this portion. Block structure.