Patent ID: 7318886

Claim:
A gas sensor having a length with a first end and a second end opposed to the first end comprising: a hollow cylindrical housing having a first end facing the first end of the gas sensor and a second end facing the second end of the gas sensor; a sensor element disposed within said housing, said sensor element having a base portion projecting from the first end of said housing and a sensing portion projecting from the second end of said housing, the sensing portion working to measure a concentration of a given component of gasses; a cylindrical measurement side cover joined to the second end of said housing to define a gas chamber which is filled with the gasses and to which the sensing portion of said sensor element is exposed; an elastic seal; a cylindrical water-repellent filter; a cylindrical atmosphere side cover assembly joined to said housing to define an air chamber to which the base portion of said sensor element is exposed, said atmosphere side cover assembly including a main cover and a filter cover, the main cover having a first end facing the first end of the gas sensor and a second end facing the second end of the gas sensor and being joined at the second end thereof to the first end of said housing, the main cover having a first end portion which is crimped to form a first neck working to retain said elastic seal within the first end portion, the filter cover being crimped to form a second neck closer to the first end of the main cover than the first neck and a third neck closer to the second end of the main cover than the first neck, the second and third necks establishing joints of the filter cover to an outer side wall of the first end portion of the main cover through said water-repellent filter and defining a cavity therebetween around the first neck of the main cover within which said water-repellent filter is disposed; and air vents formed in the main cover and the filter cover of said atmosphere side cover assembly which face said water-repellent filter disposed within the cavity, said air vents working to create a flow of air from outside said atmosphere side cover assembly to inside the air chamber.