Air inlet tube for internal combustion engine and vehicle mounted with the same tube

Abstract

The intake duct 4 of an internal combustion engine forms an air passage 10 having a bent passage part 10b allowing an air current from an inlet 10a where the outside air flows to bend to be directed toward an outlet 10d. A counter wall 34 forming the bent passage part 10b is opposite to the inlet 10a in the inflow direction A1 of the air from the inlet 10a in plan view. The drip hole 40 for draining the water entering from the inlet 10a to the outside is provided to be positioned between the inlet 10a and the counter wall 34 in a position overlapping the bent passage part 10b in a plan view. In this way, it can improve drain performance after holding down increase in ventilation resistance in draining water entering the intake duct from a drip hole.

Description

technical field [0001] The present invention relates to an intake pipe for introducing air supplied to an internal combustion engine from the atmosphere, and a vehicle equipped with the intake pipe. Background technique [0002] Since the air intake pipe installed in the internal combustion engine mounted on the vehicle is usually arranged at the front of the vehicle, droplets of rainwater or splashed water can easily enter from the inlet. For example, the air intake pipe disclosed in Patent Document 1 is arranged above the radiator provided at the front of the vehicle body, and rainwater or the like entering from the gap formed above the radiator sometimes enters through the opening for introducing air that faces the front upper opening of the vehicle body. inside the intake pipe. Also, the water entering the intake pipe passes through the intake pipe to reach the air cleaner connected downstream, and there is a possibility that an appropriate air volume required for combu...

AI Technical Summary

Problems solved by technology

[0006] In the prior art of Patent Document 2, because there is an air-water separation plate as a partition wall in the air intake base, after the air flow flowing in from the air inlet is bent by the air-water separation plate, The bottom turns back and flows around the opposite side, so the intake passage becomes complicated and the ventilation resistance becomes larger

Also, the water entering from the air inlet contacts the air-water separation plate and drips on the bottom of the air intake base, and after flowing over the bottom, it is discharged to the outside through the drain hole provided at the bottom through the drain pipe, so it is difficult to quickly drain the water

In addition, no consideration is given to the discharge of water that does not touch the air-water separation plate and the water that cannot be discharged from the drain hole

In addition, the problem of making it difficult for water to enter the air inlet of the air intake base together with the outside air to enter from the air inlet is not considered.

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