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A dust-proof housing device is adapted for a bearing assembly and includes a housing body that includes two housing-half walls, each of which has a central hole defining an axis, and an inner peripheral end surrounding the central hole. A dust-proof cover has a fixing ring fitted in the inner periph

A dust-proof housing device is adapted for a bearing assembly and includes a housing body that includes two housing-half walls, each of which has a central hole defining an axis, and an inner peripheral end surrounding the central hole. A dust-proof cover has a fixing ring fitted in the inner peripheral end of at least one of the housing-half walls, and an annular flexible member secured to the fixing ring.

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1. A dust-proof housing device for a bearing assembly, comprising: a housing body including two housing-half walls, each of which has a central hole defining an axis, and an inner peripheral end surrounding said central hole; anda dust-proof cover having a fixing ring fitted in said inner peripheral

1. A dust-proof housing device for a bearing assembly, comprising: a housing body including two housing-half walls, each of which has a central hole defining an axis, and an inner peripheral end surrounding said central hole; anda dust-proof cover having a fixing ring fitted in said inner peripheral end of at least one of said housing-half walls, and an annular flexible member secured to said fixing ring;said inner peripheral end including a stepped annular edge that interconnects outer and inner surfaces of a corresponding one of said housing-half walls, said stepped annular edge having an annular protrusion projecting into said central hole in proximity to said inner surface, a shoulder proximate to said outer surface, and a chamfer formed on said annular protrusion and proximate to said inner surface; andsaid fixing ring having a main body portion that has an L-shaped cross section and that is fitted in said stepped annular edge in a complementing manner, and a lip portion that projects from said main body portion and that engages said chamfer. 2. The dust-proof housing device as claimed in claim 1, wherein said annular flexible member has an enclosing portion that encloses said main body portion, and a flexible portion projecting into said central hole from said enclosing portion. 3. The dust-proof housing device as claimed in claim 2, wherein said flexible portion has a radial flexible part extending radially into said central hole, and an oblique flexible part that is inclined outwardly away from said radial flexible part. 4. The dust-proof device as claimed in claim 1, wherein each of said housing-half walls has a recessed wall portion which is formed with said inner peripheral end, and an annular flange that extends radially and outwardly from an outer periphery of said recessed wall portion, said annular flanges of said housing-half walls being stacked together, said recessed wall portions of said housing-half walls protruding axially from said annular flanges in two opposite outward directions and cooperatively confining a receiving space, said housing body further having a plurality of mounting holes disposed on said annular flanges, and at least one oil nozzle attached to said recessed wall portion of one of said housing-half walls. 5. A bearing assembly, comprising: a bearing unit; anda dust-proof housing device enclosing said bearing unit, and including: a housing body including two housing-half walls, each of which having a central hole defining an axis, and an inner peripheral end surrounding said central hole; andtwo dust-proof covers each of which has a fixing ring fitted in said inner peripheral end of one of said housing-half walls, and an annular flexible member secured to said fixing ring;said inner peripheral end including a stepped annular edge that interconnects outer and inner surfaces of a corresponding one of said housing-half walls, said stepped annular edge having an annular protrusion projecting into said central hole in proximity to said inner surface, a shoulder proximate to said outer surface, and a chamfer formed on said annular protrusion and proximate to said inner surface; andsaid fixing ring having a main body portion that has an L-shaped cross section and that is fitted in said stepped annular edge in a complementing manner, and a lip portion that projects from said main body portion and that engages said chamfer. 6. The bearing assembly as claimed in claim 5, wherein said annular flexible member has an enclosing portion that encloses said main body portion, and a flexible portion projecting into said central hole from said enclosing portion. 7. The bearing assembly as claimed in claim 6, wherein said flexible portion has a radial flexible part extending radially into said central hole, and an oblique flexible part that is inclined outwardly away from said radial flexible part. 8. The bearing assembly as claimed in claim 5, wherein each of said housing-half walls has a recessed wall portion which is formed with said inner peripheral end, and an annular flange that extends radially and outwardly from an outer periphery of said recessed wall portion, said annular flanges of said housing-half walls being stacked together, said recessed wall portions of said housing-half walls protruding axially from said annular flanges in two opposite outward directions and cooperatively confining a receiving space, said housing body further having a plurality of mounting holes disposed on said annular flanges, and at least one oil nozzle attached to said recessed wall portion of one of said housing-half walls. 9. The bearing assembly as claimed in claim 7, wherein said bearing unit has an outer ring disposed between said housing-half walls, an inner ring inserted in said outer ring and around the axis, a plurality of balls movably disposed between said outer ring and said inner ring, and two dust-proof rings that are disposed between said outer and inner rings on two axially opposite sides of said balls, respectively. 10. The bearing assembly as claimed in claim 9, wherein said inner ring has two axially opposite grooves that respectively correspond in position to said two dust-proof covers and that extend around the axis, and said radial flexible parts of said flexible members respectively extend into said grooves.