Seal ring, sealing apparatus and bearing apparatus

Abstract

A seal ring has an annular body which is constituted so that a disc section extended to a radially inward direction is overlapped with one end of a cylindrical section, and a sensor member for detecting rotation of an inner ring is provided to an outer periphery of the cylindrical section, and an outer case for covering the sensor member is provided by insert-forming. The outer case contracts after it is formed and is press-contact with the cylindrical section so that a gap is hardly generated.

What is claimed is:  
     
         1 . A seal ring attached to an inner peripheral surface of a fixed outside member, said seal ring forming a sealing section on an outer peripheral surface of an inside member to be inserted through said outside member inwardly and rotatably, 
 wherein an annular body with a substantially cylindrical shape is provided, and a sensor member is provided to an outer peripheral side of said annular body, and a resin-made outer case, which is fitted into said outside member in states that said outer case covers said sensor member and has a predetermined interference for said outside member, is provided by insert-forming.    
     
     
         2 . The seal ring according to  claim 1 , wherein said sensor member is arranged so as not to contact with the inner peripheral surface of said outside member and so as to substantially contact with the outer peripheral surface of said annular body.  
     
     
         3 . The seal ring according to  claim 1 , wherein said sensor member is arranged so as not to substantially contact with the outer peripheral surface of said annular body.  
     
     
         4 . The seal ring according to  claim 3 , wherein said sensor member is arranged so as not to substantially contact with the inner peripheral surface of said outside member.  
     
     
         5 . The seal ring according to  claim 1 , further comprising an elastic lip which is formed integrally with or bonded to said annular body and is brought into contact with the outer peripheral surface of said inside member so as to form a contact sealing section.  
     
     
         6 . The seal ring according to  claim 1 , further comprising an elastic lip which is formed integrally or bonded to said annular body and is brought into contact with a member attached to the outer peripheral surface of said inside member so as to form a contact sealing section.  
     
     
         7 . The seal ring according to  claim 1 , wherein a harness for covering signal lines connected with said sensor member is embedded into said outer case.  
     
     
         8 . The seal ring according to  claim 1 , wherein said sensor member is composed of at least a part of a magnetic sensor.  
     
     
         9 . A sealing apparatus having a first seal ring attached to a fixed outside member and a second seal ring attached to an inside member inserted through said outside member inwardly and rotatably and combined with said first seal ring to form a sealing section, wherein: 
 said first seal ring has an annular body with an axially cylindrical section, and is provided with a sensor member on an outer periphery of said cylindrical section of said annular body, and is provided with a resin-made outer case, which is fitted into said outside member so as to cover said sensor member and have a predetermined interference, by insert-forming; and    said second seal ring is provided with a pulsar ring in a state that the pulsar ring faces the sensor member of said first seal ring in a radial direction.    
     
     
         10 . The sealing apparatus according to  claim 9 , wherein said annular body of said first seal ring includes a disc section which is connected to one end of said cylindrical section and is extended to a radially inward direction.  
     
     
         11 . The sealing apparatus according to  claim 10 , wherein said second seal ring has an annular body which includes a cylindrical section fitted into the outer peripheral surface of said inside member and a disc section connected to one end of the cylindrical section and is extended to a radially inward direction, and said pulsar ring is attached to an inside surface of the disc section of said annular body of the second seal ring.  
     
     
         12 . The sealing apparatus according to  claim 9 , wherein said sensor member is arranged so as to substantially contact with an outer peripheral surface of the cylindrical section of said annular body of said first seal ring.  
     
     
         13 . The sealing apparatus according to  claim 9 , wherein said sensor member is arranged so as not to substantially contact with an outer peripheral surface of the cylindrical section of said annular body of said first seal ring.  
     
     
         14 . The sealing apparatus according to  claim 9 , wherein at least one of said first seal ring and said second seal ring has an elastic lip which is brought into contact with the other one so as to form a contact sealing section.  
     
     
         15 . The sealing apparatus according to  claim 9 , wherein a harness for covering signal lines connected with said sensor member is embedded into said outer case.  
     
     
         16 . The sealing apparatus according to  claim 9 , wherein said sensor member is a magnetic sensor and said pulsar ring is magnetized in a state that a pole changes alternatively in a peripheral direction, and they compose a rotation detecting device.  
     
     
         17 . A bearing apparatus comprising: 
 an outer ring member arranged in a fixed state;    an inner ring member coaxially inserted through said outer ring member inwardly and rotated;    a plurality of rolling elements interposed in several places of a circumference between said outer ring member and said inner ring member; and    a sealing apparatus attached to a shoulder section of an inner peripheral surface of said outer ring member,    wherein said sealing apparatus has a first seal ring attached to said outer ring member and a second seal ring attached to said inner ring member, and both of said seal rings are combined so as to form a sealing section,    wherein said first seal ring has an annular body with an axially cylindrical section, and is provided with a sensor member on an outer periphery of the cylindrical section of said annular body, and provided with a resin-made outer case, which is fitted into said outer ring member so as to cover said sensor member and have a predetermined interference for said outer ring member, by insert-forming,    wherein a pulsar ring is attached to said second seal ring so as to face said sensor member of said first seal ring in a radial direction.    
     
     
         18 . The bearing apparatus according to  claim 17 , wherein said annular body of said first seal ring includes a disc section which is connected to one end of the cylindrical section and is extended to a radially inward direction.  
     
     
         19 . The bearing apparatus according to  claim 18 , wherein said second seal ring has an annular body which includes a cylindrical section fitted into an outer peripheral surface of said inner ring member and a disc section connected to one end of said cylindrical section and is extended to a radially outward direction, and said pulsar ring is attached to an inner surface of the disc section of said annular body of the second seal ring.  
     
     
         20 . The bearing apparatus according to  claim 17 , wherein said sensor member is arranged so as to substantially contact with the outer peripheral surface of the cylindrical section of said annular body of said first seal ring.  
     
     
         21 . The bearing apparatus according to  claim 17 , wherein said sensor member is arranged so as not to substantially contact with the outer peripheral surface of the cylindrical section of said annular body of said first seal ring.  
     
     
         22 . The bearing apparatus according to  claim 1 , wherein at least one of said first seal ring and said second seal ring has an elastic lip which is brought into contact with the other one so as to form a contact sealing section.  
     
     
         23 . The bearing apparatus according to  claim 17 , wherein a harness for covering signal lines connected to said sensor member is embedded into said outer case.  
     
     
         24 . The bearing apparatus according to  claim 17 , wherein a concave section and a convex section, which are engaged with each other in an axial direction by a snap-fit function, are separately provided to the shoulder section of the inner peripheral surface of said outer ring member and said outer case of said first seal ring.  
     
     
         25 . The bearing apparatus according to  claim 24 , wherein a tool clearance groove at the time of grinding the shoulder section is provided with an angular section between the shoulder section of the inner peripheral surface and a raceway section of said outer ring member, and the tool clearance groove is the concave section, and a convex section, which is engaged with the concave section of said outer case of said first seal ring in an axial direction by a snap-fit function, is provided.