JP3073265B2 - Cylinder block structure of V-type engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder block structure for a V-type engine.

[0002]

2. Description of the Related Art In recent engines, a V engine satisfying both conflicting demands for high output and compactness has been considered.
The development of type engines is becoming active. In general, V-type engines can significantly reduce the length of the crankshaft, and therefore have inherently high torsional rigidity and low vibration, realization of rotational stability in a high rotation range, improved cooling performance, and a reduction in the overall length of the engine. There is a feature that various advantages such as miniaturization can be obtained.

[0003] On the other hand, the V-type engine necessarily has a unique vibration deformation mode different from the in-line type engine due to its structural characteristics. For example, a rigid body mode and a bending mode in the left and right bank portions are representative. For this reason, for example, as a reinforcement for the rigid mode, the top and bottom portions of the left and right banks are conventionally connected by a flat lid member called a top wall, or a reinforcing rib is provided to expand, translate, and twist. (See, for example, JP-A-59-160021).

[0004]

However, the partial rigidity only with the top wall and the reinforcing rib alone is not always sufficient for the vibration and deformation modes such as expansion, translation, and torsion as described above. In fact, it cannot be a measure to improve rigidity. The present invention has been made in view of the above circumstances, and an object of the present invention is to
An object of the present invention is to provide a cylinder block structure of a V-type engine having sufficient rigidity against vibrations and deformation modes such as expansion, translation, and torsion.

[0005]

In order to solve the above-mentioned problems and achieve the object, a cylinder block structure of a V-type engine according to the present invention is integrated with a pair of left and right banks offset by a predetermined position in a longitudinal direction. And a V-type engine in which a head bolt hole for mounting a cylinder head is formed between the cylinder arrangement positions of the respective left and right banks, wherein a top deck edge portion inside the V bank of the cylinder block body in each of the left and right banks, Bosses were formed at positions corresponding to the head bolt holes, and the bosses of the left and right banks were interconnected by truss members provided with reinforcing ribs.

[0006]

[0007]

[0008]

[0009]

[0010]

According to the cylinder block structure of the V-type engine of the present invention, the V of the cylinder block body in each of the left and right banks is set.
Bosses are formed at the positions corresponding to the head bolt holes on the edge of the top deck inside the bank, and the space between the bosses of these left and right banks is reinforced by reinforcing ribs. The entire cylinder block is sufficiently reinforced by being interconnected by the provided truss members.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

As described above, the truss member itself has high torsional rigidity in its own structure, and is further reinforced by reinforcing ribs. It acts so as to more reliably suppress the torsional deformation in the left and right opposite directions about the part. Also,
The tensile strength in the V bank spreading direction and the bending strength are also high. Therefore, the effect of reinforcing the rigid mode deformation is greatly improved.

Further, by forming bosses corresponding to the head bolt holes formed between the cylinder disposing positions of the banks, the thick wall portions of the block wall are reinforced more sufficiently. Then, since it is connected with the above-mentioned truss member, the strength of the connection part is greatly improved despite the presence of the head bolt hole, and the rigidity against deformation due to thermal stress and torsional deformation due to engine driving torque is further increased. improves.

[0019]

1 to 8 show the construction of a first embodiment of a cylinder block of a V-type engine according to the present invention. First, in FIG. 1, reference numeral 1 indicates an engine body of a V-type eight-cylinder engine as a first embodiment. As shown in FIGS. 2 and 4, the engine body 1 includes a cylinder block 3 having two sets of left and right banks 2L and 2R.
A cylinder head (not shown in FIGS. 2 and 4) attached to the upper portion of each bank of the cylinder block 3 (4 in FIG. 7)
6, 46), and an oil pan 10 for storing lubricating oil, which is integrally attached to the lower portion of the cylinder block 3.

First, the cylinder block 3 includes cylinder block main bodies 3A, 3A forming a set of cylinder rows of left and right blocks 2L, 2R having the V-shaped cross section.
A long (deep) skirt structure crankcase portion 3B which extends substantially straight downward from the gathering portion of the cylinder block body portions 3A, 3A and forms a crankshaft storage space inside. The crankcase portion 3B has two skirt wall portions 5a and 5 having a predetermined thickness.
b. The skirt walls 5a, 5b
The outer walls 6a, 6b of the cylinder block main bodies 3A, 3A of the upper banks 2L, 2R as shown in FIG.
And the upper and lower parts are continuous. The skirt walls 5a and 5b are partially formed with thick portions extending vertically from the outer walls 6a and 6b, and the first oil return passages 9a to 9d are continuously connected to the inside thereof. And is formed to extend downward.

The interior of the crankshaft storage space formed inside the crankcase portion 3B contains a bulkhead 7a and a bearing cap 7 having a reinforcing beam structure.
The crankshaft bearings 7b are provided at predetermined intervals between the cylinders. On the other hand, the oil pan 10 is integrally fastened to the lower surfaces (matching surfaces) of the skirt walls 5a and 5b below the crankcase 3B on the cylinder block 3 side from below through an oil seal member (not shown). ing.

The oil pan 10 has a mating surface corresponding to the entire fastening lower surface of the skirt walls 5a and 5b on the side of the cylinder block 3, and has a small oil pan with a small depth at a position close to the transmission case mounting side TR. Part 10
The upper block 10A in which a is formed and the lower block 10B which is located below the upper block 10A near the crank pulley side CP and integrated with the opening thereof.
And two sets of oil pan blocks.

The upper block 10A has a shape and a wall thickness corresponding to the skirt wall portions 5a and 5b on the cylinder block 3 side as a whole, and particularly the transmission side forming the small volume portion 10a of the oil pan. The thickness of the wall near the TR is increased to reinforce the rigidity of the skirt walls 5a and 5b of the crankcase portion 3B, and the transmission-side oil return in the first oil return passages 9a to 9d is formed in the thick portion. Second oil return passages 12, 12 are formed to extend in the lateral direction for supplying lubricating oil to the inside of the oil pan lower block 10 </ b> B oil reservoir 10 b in opposition to the lower common groove 11 of the passages 9 b, 9 c.

As shown in FIG. 5, a boss portion for attaching a top wall 20 to be described later is attached to the top deck edges 15 inside the V bank of the cylinder block main bodies 3A, 3A of the left and right banks 2L, 2R. 16,16
... are the head bolt holes 30, 30 between the cylinder arrangement positions.
Are provided in the boss portions 16, 16,..., And bolt holes 17, 17,.

On the other hand, reference numeral 20 in FIGS. 2 and 4 denotes a top wall as a truss member in the present embodiment, and the top wall 20 is, for example, a water return passage having a pipe structure as shown in FIG. 21 with two top sides 21a, 21a and one bottom side 21b as a vertex.
The inside of the three sides 21a, 21a, 21b is, for example, a reinforcing rib standing up and down as shown in detail in FIGS. Are provided so as to interconnect the bosses 16, 16... Of the left and right banks in a truss shape as shown in FIG.

The cylinder block main bodies 3A, 3A are provided on both side edges 22, 22 of the top wall 20, respectively.
Top mounting bolt holes 23 corresponding to the top wall mounting bolt holes 17, 17.
Are formed, and the triangular top wall 20 is fastened and fixed through the bolt insertion holes 23, 23 by bolts 24, 24 for mounting the top wall. In this case, the cooling water return passage 21 located at the top of the top wall 20 is provided with the three plate members 21a, 21 on the three sides forming the top wall 20.
It is formed integrally with 1a and 2b, and is configured so that the cooling effect of the bank portion itself is enhanced as a whole.

That is, according to the cylinder block structure of the first embodiment, the left and right banks 2 of the V-type engine are used.
The bosses 16, 16,... Having a more sufficient reinforcing effect are provided corresponding to the positions of the originally thick head bolt holes 30, 30,... Of the cylinder block main bodies 3A, 3A of L, 2R. Left and right banks 2 for the parts 16, 16 ...
A trussed top wall 20 for reinforcement between L and 2R is integrated with a cooling water return passage 21 and bolts 24 and
24 to fasten and fix.

Accordingly, the rigidity and strength near the head bolt holes 30, 30,... Are sufficiently high, while the expansion, translational swing and bending deformation between the pair of left and right banks 2L, 2R are reliably prevented. The torsional deformation between the left and right copper banks 2L, 2R is also reliably prevented. Further, since the cooling water return passage 21 is formed integrally with the top wall itself, the cooling performance of the bank portion is high, and the heat damage of the connecting portion between the left and right banks is effectively prevented.

On the other hand, FIG. 3, FIG. 7, and FIG. 8 show a passage structure of an oil return portion of a transmission side portion of the cylinder block 3 in particular. First, in FIG.
Is a main oil gallery common to the cylinder block bodies 3A, 3A and the cylinder head 46 of the left and right banks 2L, 2R of the V-type engine. As shown in FIG. 8, an oil passage 41 for supplying lubricating oil extends in the direction of the upper cylinder head 46, and the downstream ends 42 and 43 of the oil passage 41 are connected to the cylinder head 4 as shown in FIG.
6 through a mating surface with the hydraulic valve valve / adjuster (HLA). Then, the lubricating oil is supplied to the hydraulic valve flush / adjuster section HLA through the oil passage 41 as shown by the arrow.

On the other hand, reference numerals 31, 31... Denote cylinder head bolts connecting the cylinder head 46 to the cylinder block 3A, respectively. The cylinder head bolts 31, 31 are located on the cylinder head 46 side facing each other. Are respectively screwed into the cylinder block 3A through the head bolt holes 39, 39... And the cylinder block 3A.

In this state, the downstream end 42 of the oil passage 41 is temporarily closed by the head bolt hole 39 on the cylinder head 46 side as shown in FIG.
The downstream end 43 is further communicated with the above-mentioned hydraulic valve brush / adjuster part via the space 39a. In FIG. 3, reference numeral 50 denotes an oil return passage case on the transmission mounting surface side of the cylinder block main body 3A, 51 denotes a transmission case, 52 denotes a drive shaft, and 53 denotes a drive shaft bearing.

As described above, the oil in the oil passage 41 is supplied to the cylinder head 46 and the cylinder block 3 as described above.
A through the space 39a of the head bolt hole 39 on the cylinder head 46 side through the mating surface with the hydraulic cylinder.
When the oil is supplied to the valve-lash adjuster, oil for lubricating the valve is eventually inserted into the head bolt holes 39 and 30 of the cylinder head 46 and the cylinder block 3A.

Therefore, for example, if the cylinder head bolt 31 is once pulled out for some reason and then screwed again, it is difficult to completely screw the head bolt 31 due to the internal oil pressure. Occurs. Therefore, in the first embodiment, the cylinder block 3 on the bottom side is used.
Oil release holes 45, 4 are provided at the bottom of the A-side head bolt hole 30.
5 are formed, each of which is opened toward the drive shaft lubrication portion of the transmission mounting side mating surface to expose the intruding oil, thereby solving the above problem.

It is needless to say that the present invention is not limited to the configuration of the first embodiment described above, but can be variously modified without departing from the spirit of the present invention.
For example, in the first embodiment described above, a case where the present invention is applied to the cylinder block of a V-type eight-cylinder engine has been described. However, the present invention is not limited to such a configuration, and FIGS. As shown in FIG.
It goes without saying that the present invention can be applied to a cylinder block of a type 6 cylinder engine. Here, FIG. 9 is FIG. 1 in the first embodiment, FIG. 10 is FIG. 4 in the first embodiment, FIG. 11 is FIG. 5 in the first embodiment, and FIG. 6 corresponds to FIG. 6 in the embodiment, and the configuration thereof is different from the cylinder block of the V-type 8-cylinder engine in the first embodiment only in that the number of cylinders in each bank is reduced by one. Therefore, the same reference numerals are given to the same portions in the first embodiment, and the description thereof will be omitted.

On the other hand, it goes without saying that the present invention can be applied to a cylinder block of a V-type 12-cylinder engine as shown in FIGS. 13 to 16 as a third embodiment.
Here, FIG. 13 corresponds to FIG. 1 in the first embodiment, and FIG.
4 corresponds to FIG. 4 in the first embodiment, FIG. 15 corresponds to FIG. 5 in the first embodiment, and FIG. 16 corresponds to FIG. 6 in the first embodiment. Compared with the cylinder block of the V-type eight-cylinder engine in the first embodiment, the number of cylinders in each bank is simply increased by two. Therefore, the same reference numerals are given to the same parts in the first embodiment and Two oil return passages 9e and 9 are connected to the oil return passages 9a to 9d in the first embodiment.
The description is omitted by adding f.

As described above, as shown in the first to third embodiments, it is apparent that the present invention is applied to a V-type engine and is not limited to the number of cylinders. Further, in the various embodiments described above, the top wall 20 is used as the truss member. However, the present invention is not limited to such a configuration, and the vicinity between the head bolt holes of each of the left and right banks is not limited to each other. Any structure may be used as long as the member has a function of connecting to the member.

[0037]

According to the present invention, a boss portion is formed at a position corresponding to each of the head bolt holes on the edge of the top deck inside the V bank of the cylinder block body in each of the left and right banks. The boss portions of the bank are reinforced by reinforcing ribs, and are particularly interconnected by truss members formed with high return rigidity, whereby the entire cylinder block is sufficiently reinforced, the rigidity of the cylinder block is sufficiently increased, and the rotation is increased. Stability can be ensured, and vibration and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a case where a structure of a first embodiment of a cylinder block of a V-type engine according to the present invention is applied to a V-type eight-cylinder engine.

FIG. 2 shows a cylinder block shown in FIG.
It is sectional drawing cut | disconnected and shown along the -A line.

3 is a sectional view schematically showing a main part of the cylinder block shown in FIG. 1 in a state where a transmission is mounted.

FIG. 4 is a plan view showing a mounting state of a top wall of the cylinder block shown in FIG. 1;

FIG. 5 is a plan view showing a state in which a top wall of the cylinder block shown in FIG. 1 is removed.

FIG. 6 is a bottom view showing a state in which the top wall shown in FIG. 4 is taken out alone.

FIG. 7 is a side view (end view) of the cylinder block shown in FIG. 1 as viewed from a transmission mounting side.

FIG. 8 is an enlarged sectional view showing the cylinder block shown in FIG. 7 cut along the line BB in FIG. 7;

9 is a front view showing a case where the structure of the second embodiment of the cylinder block of the V-type engine according to the present invention is applied to a V-type six-cylinder engine, corresponding to FIG.

FIG. 10 is a plan view showing a mounting state of the top wall of the cylinder block shown in FIG. 9 in a state corresponding to FIG. 4;

11 is a plan view showing a state in which the top wall of the cylinder block shown in FIG. 9 is removed in a state corresponding to FIG. 5;

FIG. 12 is a bottom view showing a state in which the top wall shown in FIG. 10 is taken out by itself in a state corresponding to FIG. 6;

FIG. 13 is a front view showing a case where the structure of the third embodiment of the cylinder block of the V-type engine according to the present invention is applied to a V-type 12-cylinder engine in a state corresponding to FIG.

14 is a plan view showing a state where the top wall of the cylinder block shown in FIG. 13 is attached in a state corresponding to FIG. 4;

FIG. 15 is a plan view showing a state where the top wall of the cylinder block shown in FIG. 13 is removed in a state corresponding to FIG. 5;

FIG. 16 is a bottom view showing a state in which the top wall shown in FIG. 14 is taken out by itself in a state corresponding to FIG. 6;

[Explanation of symbols]

 1 engine body, 2L left bank, 2R right bank, 3A cylinder block body, 3B crankcase, 15 top edge, 16 boss, 17 bolt hole, 20 top wall, 20a upper side, 20b bottom, 21 cooling water return passage, 22 top wall edges, 23 bolt holes, 24 bolts, 25 reinforcing ribs.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-160021 (JP, A) JP-A-4-8731 (JP, U) JP-A-1-97061 (JP, U) JP-A-3- 127040 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02F 1/00-7/00

Claims (1)

(57) [Claims] 1. A V-type engine in which a pair of left and right banks are integrated at a predetermined position offset in the longitudinal direction and a head bolt hole for mounting a cylinder head is formed between cylinder arrangement positions of the left and right banks. The V-vans of the cylinder block body in each of the left and right banks
Top deck edge of the click inside each forming a boss portion at a position corresponding to the head bolt hole of the respective said right and left bar
A cylinder block structure for a V-type engine , wherein each boss portion of the link is interconnected by a truss member having a reinforcing rib.