JPH0223798Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a knocking sensor mounting structure for a V-type engine.

(Prior Art) Recently, especially in automobile engines, a knocking sensor that picks up the knocking level is often installed in order to control the ignition timing, EGR amount, etc. according to the knocking level.
This knocking sensor is generally attached to a cylinder block, as shown in, for example, Japanese Utility Model Application Publication No. 57-95427.

By the way, in a V-type engine,
Since there are two cylinder blocks, one cylinder block and the other cylinder block arranged in the mold, two knocking sensors are required if the knocking sensor is simply attached to the cylinder block as in the conventional case.

However, there is a problem in that the use of two knocking sensors requires a complicated control circuit, resulting in a considerable increase in overall cost.

(Purpose of the invention) The present invention has been made in consideration of the above circumstances, and uses only one knocking sensor to determine the knocking level between one cylinder block and another cylinder block, that is, the entire engine. It was possible to know the notsking level of
The purpose of the present invention is to provide a knocking sensor mounting structure for a type engine.

(Structure of the invention) In order to achieve the above-mentioned purpose, the present invention has the following structure. That is, in a V-type engine in which the engine blocks have one cylinder block and another cylinder block arranged in a V-shape, a connecting portion is provided that connects the inner outer walls of the two cylinder blocks that face each other. A knocking sensor is attached to the connecting portion, and the locking sensor is installed at an approximately intermediate position between the two cylinder blocks in the connecting portion, and approximately halfway in the crankshaft direction with respect to both cylinder blocks. It is set as a position, and has a configuration like this.

(Example) In FIGS. 1 and 2, 1 is an engine block, and the engine block 1 is formed by integrally molding one cylinder block 2, another cylinder block 3, and a crankcase upper half 4. Become.

In the embodiment, the engine block 1 is a V type 6 engine.
One cylinder block 2 has three cylinders 2a, 2b, and 2c formed in series, while the other cylinder block 3 also has three cylinders 3.
a, 3b, and 3c are formed. Of course, both cylinder blocks 2 and 3, that is, cylinders 2a to 2c
and 3a to 3c are arranged in a V-shape with each other.

Two ribs 5 and 6 as connecting parts are integrally molded on the engine block 1 between the two cylinder blocks 2 and 3. This 2
Of the two ribs 5 and 6, the rib 5 is
The outer walls of both cylinder blocks 2 and 3 are connected to each other at one end in the arrangement direction of cylinder blocks 2 and 3c, 3a to 3c, that is, in the crankshaft direction. Further, the rib 6 connects the outer walls of both cylinder blocks 2 and 3 at the intermediate portion in the arrangement direction of the cylinders 2a to 2c and 3a to 3c.

As shown in FIG. 2, the rib 6 is connected to the outer walls of both cylinder blocks 2 and 3 over almost the entire length thereof (the entire length in the cylinder axis direction), and is connected to the outer wall of both cylinder blocks 2 and 3 over almost the entire length thereof (the entire length in the cylinder axis direction). It has a cylindrical portion 6a extending in the vertical direction in the figure. And this cylindrical part 6
A knocking sensor 7 is attached to the top end surface of a by screwing, for example.

More specifically, the knocking sensor 7 whose mounting position is set as described above is as follows in the embodiment. First, in Fig. 1, cylinder 2
Consider a first imaginary line connecting the axial center of cylinder 2b and the axial center of cylinder 3a, and a second imaginary line connecting the axial center of cylinder 2b and the axial center of cylinder 3b. Consider a third virtual line connecting the axis. In the embodiment, the vicinity of the intersection of the three virtual lines is set as the mounting position of the knocking sensor 7.

In the above configuration, knocking caused by abnormal combustion in the cylinders 2a to 2c of one cylinder block 2 appears as vibration of the one cylinder block 2, and the vibrations are transmitted to the ribs 6 to cause knocking. The knocking sensor 7 picks up the knocking level. Further, knocking caused by abnormal combustion in the cylinders 3a to 3c of other cylinder blocks 3 is transmitted as vibration to the rib 6 as in the case described above, and the knocking sensor 7 is transmitted to the rib 6 as vibration.
The noticing level will be picked up.

In the above embodiments, a V-type 6-cylinder engine has been described, but the invention can be similarly applied to V-type engines having a different number of cylinders from those in the embodiments, such as a V-type 2-cylinder, a V-type 4-cylinder, a V-type 8-cylinder, etc. be. Further, the engine as a whole is reinforced by the ribs connecting one cylinder block 2 and the other cylinder block 3, and the number of ribs can be set to an appropriate number. Of course, the arrangement position of this rib can be selected as appropriate, but it may be determined by taking into consideration the arrangement relationship with other parts such as the carburetor and the intake/exhaust manifold.

(Effect of the invention) As is clear from the above, in the present invention, the knocking levels of two cylinder blocks, one cylinder block and the other cylinder block, are detected by one knocking sensor. Therefore, the knocking level of a V-type engine can be detected without a large increase in cost. Further, while using one knocking sensor, knocking in all cylinders can be detected with almost the same sensitivity.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention. Second
The figure is a sectional view taken along the line -- in FIG. 2... One cylinder block, 3... Other cylinder block, 5, 6... Rib, 7... Knocking sensor.

Claims (1)

[Claims for Utility Model Registration] In a V-type engine having one cylinder block and another cylinder block arranged in a V-shape, the inner outer walls of the cylinder blocks facing each other are connected to each other. a connecting portion is provided, and a locking sensor is attached to the connecting portion, and the locking sensor is installed at an approximately intermediate position between the two cylinder blocks in the connecting portion and with respect to both the cylinder blocks. A knocking sensor mounting structure for a V-type engine, characterized in that the knocking sensor is set at an approximately intermediate position in the crankshaft direction.