| 主权项 |
1. A gas sensor adapted for disposing in an intake passage of an internal combustion engine, which comprises:
a detecting element extending in an axial direction and comprising a detecting portion for detecting a specific gas component in a gas to be measured on a leading end side of the gas sensor; and a protector having a tube portion surrounding the detecting portion from outside in a radial direction and a bottom portion connected to a leading end side of the tube portion, the protector having a first opening which is disposed at the tube portion so as to only face the downstream side of the intake passage in the internal combustion engine, and which allows the gas to be measured to flow into the tube portion, and a second opening at the bottom portion through which the gas to be measured flows, and wherein the second opening is formed as a protruding part outside the bottom portion, wherein the bottom portion includes a first bottom wall portion and a second bottom wall portion, the second bottom wall portion protrudes toward the leading end side in the axial direction, and at least a part of an inner face of the second bottom wall portion is located at the leading end side in the axial direction with respect to an outer face of the first bottom wall portion, the second opening, which is visible when viewed from the downstream side of the intake passage, is provided on a side opposite the inner space of the tube portion in a communication passage formed by the inner face of the second bottom wall portion, and the communication passage is formed so that an opening area of the second opening is larger than an area of a largest imaginary circle that can be placed inside the first opening when the first opening is viewed planarly in a direction perpendicular to the central axis of the tube portion, and wherein all the openings in the protector only face the downstream side of the intake passage in the internal combustion engine. |
