JPH0612217Y2 - Support structure for engine accessories - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a support structure for an engine accessory in an automobile engine.

[Prior art]

Generally, in an automobile engine, various auxiliary machines such as a generator, a distributor and a fuel injection pump are attached to the engine body.

Most of these accessories have conventionally been supported by an elastic member such as rubber sandwiched between them and the mounting surface of the engine body in order to vibrate and shut off.

Therefore, the auxiliary equipment is supported by an elastic member having elastic force, so that the resonance frequency always exists, and the vibration isolation is effective only in the frequency range higher than the resonance frequency. In the vicinity, there was a problem that the vibration level of the auxiliary machine rather increased, resulting in deterioration of noise and deterioration of durability reliability.

In Japanese Utility Model Laid-Open No. 58-32165, a combination of a front plate made of metal plate and a gear case is attached to a crankcase so that a part of the combination is projected and the front plate is fixed inside. There is disclosed an example in which a pump case for mounting a fuel injection pump is fixed to the overhanging portion of this combined body on the same side as the crankcase.

However, in the above support structure, since the pump case is rigidly supported by the combined body, the resonance phenomenon as described above does not occur, but the vibration of the auxiliary machine is transmitted to the engine side as it is and the radiated noise is generated. Has the drawback of increasing.

[Purpose of device]

Therefore, an object of the present invention is to provide a support structure for an engine accessory that can prevent the transmission of vibrations and prevent the occurrence of resonance.

[Constitution of device]

The present invention that achieves the above-mentioned object is to provide a spacer made of fiber reinforced plastic between an engine body and an auxiliary machine attached to the engine body, and to provide the engine body and the spacer, and the spacer and the auxiliary machine. Are connected and fixed by separate bolts, and the auxiliary machine is metallically attached to the engine body in a non-connected manner.

[Action]

Since the present invention is configured as described above and completely disconnects the engine body and the auxiliary machine from each other metallically via the spacer made of fiber reinforced plastic, the transmission of vibration is effectively blocked and the engine body is separated from the engine body. It is possible to reduce radiated noise and to avoid occurrence of resonance phenomenon. Further, since the auxiliary equipment is fixed to the spacer reinforced by fibers to increase the rigidity and the spacer is fixed to the engine body by bolts, the attachment of the auxiliary equipment does not become loose.

[Example of device]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is an engine body, and 2 is a fuel injection pump as an auxiliary machine.

The fuel injection pump 2 is mounted on a mounting flange portion 3 cast integrally with the engine body 1 via a spacer 4.

The mounting flange portion 3 is formed with through holes 5 ... Located at the central portion and both the left and right portions, and three screw holes 6 are formed at the outer peripheral portion at predetermined intervals.

The spacer 4 is made of fiber reinforced plastic (FRP) such as glass fiber or carbon fiber, and is formed by, for example, stacking a plurality of sheets in which fibers are woven in a lattice pattern and impregnating the sheet with molten plastic. To do.

At this time, as shown in FIGS. 2 and 3, through holes 7 are formed in the sheet at positions corresponding to the through holes 5 and the screw holes 6 formed in the mounting flange portion 3 in advance. When impregnating with plastic, a metal push 8 is embedded in the central through hole 7, and a metallic collar 9 is embedded in the other through holes.

The fuel injection pump 2 has mounting holes 11 and 12 formed in mounting brackets 11 and 11 attached to both left and right parts of the pump case 10.

Therefore, when the fuel injection pump 2 is attached to the engine body 1, first, the fuel injection pump 2 and the spacer 4 are connected with the bolt 13 through the bolt insertion hole 12 and the through hole 7, and then the spacer 4 is attached. The bolt 14 may be coupled to the mounting flange portion 3 through the through hole 7 and the screw hole 6.
At this time, the central shaft portion 15 of the fuel injection pump 2 and the bolt 1
3 and 13 are positioned inside the through-holes 5 ... Inward of the central portion and the left and right portions of the mounting flange portion 3 to avoid direct contact with the mounting flange portion 3. Of course, contact between the bolt 14 and the pump case 10 is also avoided.

In this way, the engine body 1 and the spacer 4, and the spacer 4 and the fuel injection pump 2 are connected and fixed by the separate bolts 13 and 14, respectively.
Is completely connected in a metallic manner, the vibration is transmitted between the engine body 1 and the fuel injection pump 2 only through the spacer 4. Therefore, in the comparatively high frequency range that influences vibration, as is clear from the comparison diagram of the vibration transfer characteristics of FIG. 4, the resin has a higher internal damping action than the rubber, and the spacer 4 having the resin vibrates. Transmission is effectively blocked. Further, since the spacer 4 is reinforced with fibers to effectively increase the rigidity thereof, it is possible to effectively suppress the occurrence of the resonance phenomenon, and also to fix the fuel injection pump 2 by bolts. The installation of will not come loose. Furthermore, since it is not rigidly connected and fixed so as to interpose a metal plate,
The vibration generated by the fuel injection pump 2 is transmitted to the engine body 1, and the radiated noise generated by the engine body 1 acting as a speaker can be reduced.

[Effect of device]

As described above, according to the present invention, the engine body and the auxiliary machine are completely disconnected from each other metallically through the spacer made of fiber reinforced plastic, so that the transmission of vibration is effectively blocked and the radiation from the engine body is radiated. It is possible to reduce noise, avoid occurrence of resonance phenomenon, and prevent deterioration of noise and deterioration of durability reliability. Further, since the auxiliary machine is fixed to the spacer reinforced by fibers to increase the rigidity and the spacer is fixed to the engine body by bolts, there is no problem such as loose attachment of the auxiliary machine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a front view of a spacer, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 5 is a comparison diagram of the vibration transfer characteristics of FIG. 1 ... Engine body, 2 ... Fuel injection pump (auxiliary equipment), 4 ...
Spacers, 13, 14 ... Bolts.

Claims (1)

[Scope of utility model registration request] A spacer made of fiber reinforced plastic is interposed between an engine main body and an auxiliary machine attached to the engine main body, and the engine main body and the spacer, and the spacer and the auxiliary machine are separate bolts. A support structure for an engine auxiliary machine, which is connected and fixed by means of the above, and the auxiliary machine is metallically attached to the engine body in a non-connected manner.