JPH02123256A - Cylinder body structure - Google Patents

Abstract

PURPOSE:To prevent the deformation of a cylinder bore, etc., by allowing the axis line of a bolt for installing a cylinder head onto a cylinder block having a plurality of banks to coincide with the axis line of a bolt for installing the bearing cap of a crankshaft onto the cylinder block. CONSTITUTION:When a large pressure is generated inside a cylinder 4, an upward force acts onto a bolt 13 on a cylinder head through the cylinder head. A downward force acts onto a bolt 12 on a hearing cap 11 through a piston, connecting rod, crank shaft 5, and the bearing cap 11. Since the axis line of the bolt 13 is arranged in coincidence with the axis line of the bolt 12, the forces acting onto the bolts 12 and 13 are offset each other, and no bending moment is generated on a bulkhead 9, etc. Therefore, the deformation of a cylinder bore 15, etc., which communicates to the bulkhead 9, etc., is prevented, and the consumption of oil and the generation of vibration and noise are prevented, and the increase of the weight of the engine can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylinder body structure in which the arrangement of head bolts is improved in a multi-bank internal combustion engine or compressor such as a ■-type or a W-type.

[Prior Art] Cylinder body structures for multi-bank internal combustion engines or compressors such as V-type and W-type are known. For example, the cylinder body structure between V-type machines is
As shown in FIG. 4, a cylinder block 1 having a 7-shaped side surface having a right puncture 2 and a left bank 3 has a plurality of cylinders 4 formed in each of the right puncture 2 and the left bank 3. A cylinder head (not shown) is attached to the upper end of the bank 2.3 with bolts 13, and a bulkhead 9 is attached to the cylinder block 1 to partition the adjacent cylinders 4 and to attach the crankshaft bearing 8. is formed, and each bulkhead 9 has a bearing saddle 10 that constitutes one side of the two-piece bearing 8.
A bearing cap 11 constituting the other side of the bearing 8 is attached to the bearing saddle with bolts 12.

[Problems to be Solved and Attempted by the Invention] However, in the conventional cylinder body structure, the axis of the bolt 13 for attaching the cylinder head is arranged symmetrically with respect to the cylinder axis. A common bolt arrangement was to place the bolts in the middle of adjacent cylinder bores 15 (Utility Model Application No. 60-61458). Therefore, the axis of the bolts 13 for attaching the cylinder head did not fit the bearing cap 11. Bolt 12 to attach
Therefore, there is a problem in that a bending moment is generated in the bulkhead 9 etc. due to large pressure such as an explosion generated in the cylinder 4, causing deformation of the cylinder bore 15 etc. connected to the bulkhead 9.

That is, due to the large pressure generated within the cylinder 4,
The bolt 12 of the bearing cap 11 includes a piston, a connecting rod, a crankshaft, and the bearing cap 11.
A downward force acts on a part of the bolt 13 of the cylinder head through the cylinder head, and an upward force acts on the bolt 13 of the cylinder head through the cylinder head. At this time, since the axis of the bolt 13 of the cylinder head is deviated from the axis of the bolt 12 of the bearing cap 11, a bending moment is generated in the bulkhead 9, etc., and the cylinder bore 15, etc. connected to the bulkhead 9 is deformed. It becomes like this.

As a result, problems arise in terms of oil consumption and vibration noise, and significant reinforcement is required in order to increase rigidity1, resulting in a significant increase in engine weight9.Therefore, the present invention aims to solve the above problems. The object of the present invention is to provide a cylinder body structure that can prevent deformation of a cylinder bore, etc., without requiring significant reinforcement to improve the sameness.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention makes the axis of the bolt that attaches the cylinder head to the cylinder block having a plurality of banks, and the axis of the bolt that attaches the bearing cap of the crankshaft to the cylinder block. It is arranged almost in line with the axis.

[Function] When large pressure is generated inside the cylinder, for example during the explosion process in an internal combustion engine, that pressure acts upward on the bolt through the cylinder head, while acting downward on the bolt through the piston, crankshaft and bearing cap. However, since the axes of the bolts on the cylinder head are substantially aligned with the axes of the bolts on the bearing cap, the force acting on them does not generate any moment on the bulkhead. Therefore, deformation of the inside of the cylinder 4, etc. is prevented, and problems with oil consumption and vibration and noise do not occur, and reinforcement for increasing rigidity is not required, so that the weight of the engine does not increase.

[Example code] A preferred embodiment of the present invention will be described based on the accompanying drawings.

In Figures 1 and 2, 1 has two banks.
In a cylinder block of a type 6-cylinder engine, three cylinders 4 are arranged in each right bank 2 and left bank 3 with a predetermined bank offset S. The base of the cylinder block 1 is a crank case 6 that horizontally accommodates a common crankshaft 5.
Inside, adjacent cylinders 4 are partitioned and a crankshaft 5 is installed.
A bulkhead 9 is formed to provide a bearing 8 that rotatably supports the main shaft portion 7 of the main shaft portion 7 .

The bulkhead 9 is provided with a bearing saddle 10 that constitutes one side of a split bearing 8, and a bearing cap 11 that constitutes the other side of the bearing 8 is attached to the bearing saddle 10 with bolts 12. A cylinder head (not shown) is attached to the upper end of each bank of the cylinder Glock 1 by bolts 13, and in particular, the axes of these bolts 13 are arranged to coincide with the axis of the bolts 12 of the bearing cap 11. There is. That is, a bolt hole 14 for screwing the bolt 13 of the cylinder head into the cylinder block 1 is formed so as to coincide with an axis of a bolt hole (not shown) into which the bolt 12 of the bearing cap 11 is screwed. .

Note that these bolts 13 of the cylinder head and bolts 12 of the bearing cap 11 are arranged parallel to the axis of the cylinder 4.

Next, the operation of this embodiment will be explained.

When a large pressure is generated inside the cylinder 4, for example during an explosion process in an internal combustion engine, an upward force is applied to the bolt 13 of the cylinder head via the cylinder head due to the pressure, while an upward force is applied to the bolt 12 of the bearing cap 11. Shown, no piston.

A downward force acts through the connecting rod, the crankshaft 5, and the bearing cap 11.

However, since the axes of the bolts 13 of the cylinder head are aligned with the axes of the bolts 12 of the bearing cap 11, the forces acting on these bolts 12, 13 cancel each other out, and the bulkhead 9 of the cylinder block 1 No bending moment is generated.

As a result, the cylinder box 15 connected to the bulkhead 9
This prevents deformation, such as oil consumption, vibration and noise problems, and does not require reinforcement to increase rigidity, so there is no increase in engine weight.

Incidentally, it is sufficient that the axes of at least 475 or more of the bolts 13 of the cylinder head coincide with the axes of the bolts 12 of the bearing cap 11; Matching is not limited to perfect matching, for example, the bolts 13 of the cylinder head
174 to 1/2 or 1710 to 1/2 of the bank offset S from the middle part of the adjacent cylinder bore 15.
They may be placed close together.

[Effects of the Invention] In short, according to the present invention, the axis of the bolt of the cylinder head is arranged so as to almost coincide with the axis of the bolt of the bearing cap, so that when a large pressure is generated inside the cylinder, for example in an internal combustion engine, During the explosion process, the pressure causes the force acting upward on the bolt via the cylinder head and the force acting downward on the bolt via the piston, crankshaft and bearing cap to cancel each other out, creating a moment in the bulkhead. Therefore, deformation of the cylinder bore, etc. can be prevented, and problems with oil consumption and vibration and noise will not occur, and there is no need for reinforcement to increase rigidity, so there will be no increase in engine weight. I don't.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the cylinder body structure according to the present invention, FIG. 2 is a cross-sectional view of the main part of FIG. 1, FIG. 3 is a plan view showing a conventional cylinder body structure, and FIG. is a sectional view of the main part of FIG. 3. In the figure, 1 is a cylinder block, 2.3 is a bank, 5 is a crankshaft, 11 is a bearing cap, 12 is a bolt for mounting it, and 13 is a bolt for mounting a cylinder head. 9 Patent Applicant Agent for Isuzu Motors Co., Ltd. Patent attorney Makoto Kinutani Detuning diagram

Claims (1)

[Claims] 1. A cylinder body structure characterized in that the axis of a bolt that attaches a cylinder head to a cylinder block having a plurality of banks is arranged so as to substantially coincide with the axis of a bolt that attaches a bearing cap of a crankshaft to the cylinder block.