Filter device for air compressor

A filter device for an air compressor, where the air compressor comprises a driving motor and a cylinder assembly, the filter device comprising:

• a base member having a back side and a front side, where the back side of the base member is for sealing and connecting to a rear end of the driving motor, the front side of the base member is provided with a housing space surrounded with a side wall, the base member has a plurality of exhaust holes located on an interior bottom surface of the housing space, the exhaust holes communicate with the driving motor's interior, at least one filtering material is placed inside the housing space;
• and
• a cover member joined to the base member to seal the housing space, where at least one side of the cover member is provided a plurality of air intake grooves, the air intake grooves correspond to the side wall of the housing space, creating gaps between the cover member and the side wall of the housing space, allowing external air to enter the housing space through the air intake grooves;
• wherein, when the air compressor starts, external air is forcibly drawn through the air intake grooves, the at least one filtering material, and the exhaust holes into the driving motor;
• and
• wherein the side wall of the base member that surrounds the housing space has a top surface, and wherein the at least one side of the cover member defines an inside surface that faces and is placed in contact engagement with the top surface of the side wall of the base member, the inside surface of the cover member having a periphery corresponding to the top surface of the side wall of the base member, the inside surface of the cover member being recessed along a plurality of separate sections of the periphery of the inside surface to form a plurality of recessed peripheral sections alternating with un-recessed peripheral sections of the periphery, so as to define the plurality of air intake grooves alternating with the un-recessed peripheral sections, wherein the un-recessed peripheral sections are in contact engagement with the top surface of the side wall of the base member, and the recessed peripheral sections are spaced from the top surface of the side wall of the base member to form the gaps between the cover member and the side wall of the base member.