초록 ▼

A sealing member can include a radially-working lip which contacts a drive shaft in a radial direction to seal a gap between the drive shaft and the housing in the radial direction, an axially-working lip extending in an axial direction, and a contact member which contacts the axially-working lip to

A sealing member can include a radially-working lip which contacts a drive shaft in a radial direction to seal a gap between the drive shaft and the housing in the radial direction, an axially-working lip extending in an axial direction, and a contact member which contacts the axially-working lip to seal the gap between the drive shaft and the housing in the axial direction. The contact member can be fitted to the drive shaft to rotate with the drive shaft.

대표청구항 ▼

What is claimed is: 1. A drive shaft sealing device for a small watercraft comprising a drive shaft configured to transmit engine power to a propulsion unit, a bearing rotatably supporting the drive shaft, a housing holding the bearing, and a sealing member interposed between the housing and the dr

What is claimed is: 1. A drive shaft sealing device for a small watercraft comprising a drive shaft configured to transmit engine power to a propulsion unit, a bearing rotatably supporting the drive shaft, a housing holding the bearing, and a sealing member interposed between the housing and the drive shaft and configured to prevent water from entering the bearing, the sealing member comprising a radially sealing section which contacts the drive shaft in a radial direction to seal a gap between the drive shaft and the housing in the radial direction, an axially sealing section extending in an axial direction, and a contact member which contacts the axially sealing section to seal the gap between the drive shaft and the housing in the axial direction, the contact member being connected to the drive shaft to rotate with the drive shaft, wherein the axially sealing section includes a lip extending generally in the axial direction, the lip also being tilted outwardly in the radial direction. 2. The drive shaft sealing device for a small watercraft according to claim 1, wherein the radially sealing section and the axially sealing section are one monolithic part. 3. The drive shaft sealing device for a small watercraft according to claim 1, wherein a water scattering structure is provided on an axial end surface of the contact member, the water scattering structure being designed to guide water externally in the radial direction when the contact member rotates with the drive shaft. 4. The drive shaft sealing device for a small watercraft according to claim 1, wherein the contact member is located such that at least a part of the contact member faces the housing, and the part of the contact member facing the housing is provided with a water discharging structure, the water discharging structure being designed to guide water externally of the housing in the axial direction when the contact member rotates with the drive shaft. 5. The drive shaft sealing device for a small watercraft according to claim 1, wherein the contact member is made of metal, and an insulating cover is disposed to cover at least a part of the contact member. 6. The drive shaft sealing device for a small watercraft according to claim 1, wherein the propulsion unit is a water jet pump, the water jet pump including an impeller driven by the drive shaft, a water passage through which water drawn by rotations of the impeller passes, and a jet nozzle for jetting the water pressurized by the impeller, and the contact member is provided to face a space communicating with the water passage. 7. The drive shaft sealing device for a small watercraft according to claim 1, wherein the drive shaft comprises a shaft body disposed in a drive shaft sleeve, the radially sealing section contacting an outer surface of the drive shaft sleeve. 8. The drive shaft sealing device for a small watercraft according to claim 1. in combination with a watercraft comprising a hull, wherein the drive shaft extends through an aperture in the hull. 9. A drive shaft sealing device for a small watercraft comprising a drive shaft configured to transmit engine power to a propulsion unit, a bearing rotatably supporting the drive shaft a housing holding the beam and a sealing member interposed between the housing and the drive shaft and configured to prevent water from entering the bearing, the sealing member comprising a radially sealing section which contacts the drive shaft in a radial direction to seal a between the drive shaft and the housing in the radial direction, an axially sealing section extending in an axial direction, and a contact member which contacts the axially sealing section to seal the gap between the drive shaft and the housing in the axial direction, the contact member being connected to the drive shaft to rotate with the drive shaft wherein the radially sealing section and the axially sealing section are one monolithic part. 10. A drive shaft sealing device for a small watercraft comprising a drive shaft configured to transmit engine power to a propulsion unit, a bearing rotatably supporting the drive shaft, a housing holding the bearing, and a sealing member interposed between the housing and the drive shaft and configured to prevent water from entering the bearing, the sealing member comprising a radially sealing section which contacts the drive shaft in a radial direction to seal a gap between the drive shaft and the housing in the radial direction an axially sealing section extending in an axial direction and a contact member which contacts the axially sealing section to seal the gap between the drive shaft and the housing in the axial direction, the contact member being connected to the drive shaft to rotate with the drive shaft, wherein a water scattering structure is provided on an axial end surface of the contact member, the water scattering structure being designed to guide water externally in the radial direction when the contact member rotates with the drive shaft. 11. The drive shaft sealing device for a small watercraft according to claim 10, wherein the water scattering structure is formed by at least one of a groove and a rib which extend from an outer peripheral edge of the axial end surface of the contact member toward an axial center portion thereof. 12. A drive shaft sealing device for a small watercraft comprising a drive shaft configured to transmit engine power to a propulsion unit, a bearing rotatably supporting the drive shaft, a housing holding the bearing, and a sealing member interposed between the housing and the drive shaft and configured to prevent water from entering the bearing, the sealing member comprising a radially sealing section which contacts the drive shaft in a radial direction to seal a gap between the drive shaft and the housing in the radial direction, an axially sealing section extending in an axial direction, and a contact member which contacts the axially sealing section to seal the gap between the drive shaft and the housing in the axial direction, the contact member being connected to the drive shaft to rotate with the drive shaft wherein the contact member is located such that at least a part of the contact member faces the housing, and the part of the contact member facing the housing is provided with a water discharging structure, the water discharging structure being designed to guide water externally of the housing in the axial direction when the contact member rotates with the drive shaft. 13. The drive shaft sealing device for a small watercraft according to claim 12, wherein the water discharging structure is formed by at least one of a groove and a rib formed in a helical manner on the part of the contact member facing the housing. 14. A shaft sealing assembly for supporting a spinning shaft, the shaft sealing assembly comprising a bearing rotatably supporting the spinning shaft, a housing supporting the bearing, and a sealing member interposed between the housing and the spinning shaft and configured to prevent water from entering the bearing, the sealing member comprising a generally radially extending sealing section which contacts the spinning shaft in a generally radial direction to seal a gap between the spinning shaft and the housing in the generally radial direction, a generally axially extending sealing section extending in a generally axial direction, and a contact member which contacts the generally axially extending sealing section to seal the gap between the spinning shaft and the housing in the generally axial direction, the contact member being connected to the spinning shaft to rotate with the spinning shaft wherein the axially sealing section includes a lip extending generally in the generally axial direction, the lip also being tilted outwardly in the generally radial direction. 15. The shaft sealing assembly according to claim 14, wherein the spinning shaft comprises a shaft body disposed in a shaft sleeve, the generally radially extending sealing section contacting an outer surface of the shaft sleeve.