Drive transmitting device, and image forming apparatus

A drive transmitting device comprising:

• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other;
• a driving motor that is connected to the driving-side rotating member;
• and
• a connecting shaft that is connected to a driven-side end of the driven-side rotating member and is driven and rotates, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves,
• the driving-side rotating member is directly connected to a rotor as a driving shaft of the driving motor,
• the driven-side rotating member includes a first through-hole that penetrates in a direction perpendicular to the axial direction at a driven-side end,
• the connecting shaft includes
• a shaft hole in which the driven-side end of the driven-side rotating member is arranged in the axial direction,
• a second through-hole that penetrates in a direction perpendicular to the axial direction and crosses the shaft hole, and
• two slits opposed to each other that extend in the axial direction and divide the shaft hole into two sections, and
• the driven-side end of the driven-side rotating member is arranged in the shaft hole, and the first through-hole and the second through-hole are aligned in a line to screw a male-screw member into the first through-hole and the second through-hole.

A drive transmitting device comprising:

• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other;
• a driving motor that is connected to the driving-side rotating member;
• and
• a connecting shaft that is connected to a driven-side end of the driven-side rotating member and is driven and rotates, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves,
• the driving-side rotating member is directly connected to a rotor as a driving shaft of the driving motor,
• the connecting shaft includes a first through-hole that penetrates in a direction perpendicular to the axial direction at a driving-side end,
• the driven-side rotating member includes
• a shaft hole in which the driving-side end of the connecting shaft is arranged in the axial direction,
• a second through-hole that penetrates in a direction perpendicular to the axial direction and crosses the shaft hole, and
• two slits opposed to each other that extend in the axial direction and divide the shaft hole into two sections, and
• the driving-side end of the connecting shaft is arranged in the shaft hole, and the first through-hole and the second through-hole are aligned in a line to screw a male-screw member into the first through-hole and the second through-hole.

A drive transmitting device comprising:

• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other;
• a driving motor that is connected to the driving-side rotating member;
• a connecting shaft that is connected to a driven-side end of the driven-side rotating member and is driven and rotates;
• and
• a bearing that rotatably supports the connecting shaft, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves,
• the driving-side rotating member is directly connected to a rotor as a driving shaft of the driving motor,
• the driven-side rotating member includes a shaft hole in which the driving-side end of the connecting shaft is arranged in the axial direction, and
• the driven-side end of the driven-side rotating member contacts the driving-side end of the bearing when the driving-side end of the connecting shaft is arranged in the shaft hole.

A drive transmitting device comprising:

• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other;
• and
• a driving motor that is connected to the driving-side rotating member, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves,
• the driving-side rotating member is directly connected to a rotor as a driving shaft of the driving motor, and
• the driving-side rotating member and the driven-side rotating member include a mark at a predetermined position in a rotation direction.

An image forming apparatus comprising:

• an image carrying member that carries a visible image on an endless moving surface;
• a visible-image forming member that forms a visible image on the endless moving surface;
• and
• a drive transmitting device that transmits a driving force to the image carrying member, and includes
• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other, and
• a driving motor that is connected to the driving-side rotating member, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves, and
• the driving-side rotating member extends inside the drivng motor and is directly connected to a rotor as a driving shaft of the driving motor.

An image forming apparatus comprising:

• a latent image carrying member that carries a latent image on an endless moving surface;
• a developing member that develops the latent image on the latent image carrying member by a developer carried on the endless moving surface;
• and
• a drive transmitting device that transmits a driving force to any one of the latent image carrying member and the developing member, and includes
• a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other, and
• a driving motor that is connected to the driving-side rotating member, wherein
• a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint,
• any one of the driving-side rotating member and the driven-side rotating member includes
• an outer ring,
• an inner ring that is located inside the outer ring,
• a cylindrical space between the outer ring and the inner ring, and
• a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction,
• the other one of the driving-side rotating member and the driven-side rotating member includes
• a ball holding member that holds a plurality of balls in a plurality of though-holes in a cylindrical peripheral wall that align in a circumferential direction,
• the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves, and
• the driving-side rotating member extends inside the driving motor and is directly connected to a rotor as a driving shaft of the driving motor.