JPH06193502A - Cylinder block of serial multiple cylinder engine - Google Patents

Abstract

PURPOSE:To facilitate prevention of knocking of a serial multiple cylinder engine by surely detecting knocking oscillation. CONSTITUTION:A rib 21 for crossingly connecting together projection parts 14 of oil drain holes 13 projected from side walls are provided on the side walls, and knocking oscillation transmitted to a knocking sensor mounting seat 15 is not influenced by projection parts 14, and knocking is surely detected, and prevention of the knocking is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder block of an in-line multi-cylinder engine, which is capable of reliably detecting knocking vibration.

[0002]

2. Description of the Related Art A conventional cylinder block of an in-line multi-cylinder engine will be described with reference to FIG. FIG. 3 shows a perspective view of a cylinder block of a conventional in-line multi-cylinder engine.

In the cylinder block 1, four cylinder bores 2 are arranged in series, and an oil drain hole 3 as a fluid passage is provided near the cylinder bore 2. The oil drain hole 3 in the side wall 1a of the cylinder block 1 is a protrusion 4 extending in the vertical direction. A knock sensor mounting seat 5 is provided near the protrusion 4 of the side wall 1a at approximately the center of the cylinder bore 2 in the arrangement direction, and a knock sensor (not shown) is mounted on the knock sensor mounting seat 5.

Knocking is a phenomenon in which the gas in the combustion chamber vibrates due to self-ignition of unburned gas at the end of the combustion chamber, and this vibration is transmitted to the engine body, for example, the cylinder block 1. If such knocking occurs violently, energy loss (output reduction), impact on various parts of the engine, and further reduction in fuel consumption are caused.

For this reason, it is desirable to avoid knocking. Conventionally, a knock sensor is attached to the knock sensor mounting seat 5 of the cylinder block 1, and knocking vibration is detected by the knock sensor. Knocking is avoided by performing control such as delaying the ignition timing of the cylinder based on the detection signal of the knock sensor.

[0006]

In the conventional cylinder block 1, the knock sensor mounting seat 5 is provided on the side wall 1a at the substantially central portion in the arrangement direction of the cylinder bores 2 so that knocking vibration can be detected by one knock sensor. There is.
However, the oil drain hole 3 is formed in the side wall 1a of the cylinder block 1.
Since the protrusion 4 is formed, the side wall 1a has an uneven state. Therefore, the knocking vibration may not be accurately transmitted to the knock sensor mounting seat 5, and there is a possibility that the knocking cannot be reliably detected.

[0007]

SUMMARY OF THE INVENTION The structure of the present invention for solving the above problems is such that a plurality of cylinder bores are arranged in series, and a fluid passage is formed in a state of being proximate to the cylinder bores and protruding from a side wall. In a cylinder block of an in-line multi-cylinder engine in which a knock sensor mounting seat is provided in the vicinity of a fluid passage on a side wall at approximately the center of the arrangement direction of the cylinder bores, ribs are formed on the side wall to connect the fluid passages to each other. And

[0008]

[Function] Although the fluid passage is projected on the side wall, since the rib is provided across each fluid passage, knocking vibration transmitted to the knock sensor mounting seat is not influenced by the fluid passage. Absent.

[0009]

1 is a side view of a cylinder block of an in-line multi-cylinder engine according to an embodiment of the present invention, and FIG.
II-II line arrow is shown.

Four cylinder bores 12 are arranged in series in the cylinder block 11, and an oil drain hole 13 as a fluid passage is provided near the cylinder bore 12. Oil drop hole 13 in the side wall 11a of the cylinder block 11
Is a protruding portion 14 extending in the vertical direction.

A knock sensor mounting seat 15 is provided in the vicinity of the projecting portion 14 of the side wall 11a at approximately the center in the arrangement direction of the cylinder bores 12, and a knock sensor (not shown) is mounted on the knock sensor mounting seat 15. .
Each protrusion 14 is connected by a rib 21, and the rib 21 is formed across the protrusion 14.

A knock sensor is mounted on the knock sensor mounting seat 15, and the cylinder block 11 is mounted by the knock sensor.
The knocking vibration of is detected. The side wall 11 a of the cylinder block 11 has a protrusion 1 of the oil drop hole 13.
However, since the protrusion 14 is connected by the rib 21, the knocking vibration transmitted to the knock sensor is not affected by the protrusion 14.

Therefore, regardless of which cylinder the knocking occurs in, the knocking vibration is accurately transmitted to the knock sensor, and the knocking can be reliably detected.

[0014]

Since the cylinder block of the in-line multi-cylinder engine of the present invention is provided with the rib on the side wall which connects the fluid passages formed in the state protruding from the side wall, the knocking vibration transmitted to the knock sensor mounting seat is prevented. It is not affected by the protrusion of the fluid passage. As a result, knocking vibration is accurately transmitted to the knock sensor mounting seat, knocking can be reliably detected, and knocking avoidance of the in-line multi-cylinder engine can be facilitated.

[Brief description of drawings]

FIG. 1 is a side view of a cylinder block of an in-line multi-cylinder engine according to an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a perspective view of a cylinder block of a conventional in-line multi-cylinder engine.

[Explanation of Codes] 11 Cylinder Block 11a Side Wall 12 Cylinder Bore 13 Oil Drop Hole 14 Projection 15 Knock Sensor Mounting Seat 21 Rib

Claims (1)

[Claims] 1. A knock sensor is provided in which a plurality of cylinder bores are arranged in series, and a fluid passage is formed in a state of being proximate to the cylinder bore and protruding from a side wall, and near the fluid passage of the side wall at substantially the center in the arrangement direction of the cylinder bores. A cylinder block for an in-line multi-cylinder engine, in which a rib is provided on a side wall of the in-line multi-cylinder engine provided with a mounting seat, the rib connecting the fluid passages to each other.