Abstract:
PROBLEM TO BE SOLVED: To surely control a gap in a radial direction of a segment forming a retainer of a super thin-walled bearing and to improve work efficiency for combining respective segments. SOLUTION: A cylinder-shaped connecting surface 45A and spherical connecting surface 46A are formed at one of a connecting portion A of the segment 40. These connecting surfaces 45A and 46A are respectively connected with a cylinder-shaped connecting surface 45B and spherical connecting surface 46B formed in a connecting portion B of a counter-segment 40 in a radial direction at a concavo-convex connecting state, and pulling-out of respective segments 40 can be prevented in a radial direction accordingly.
Abstract:
PROBLEM TO BE SOLVED: To provide an attachment main shaft device fitted to a machine tool, having high rotational accuracy of a tool and holding rigidity, and capable of improving machining accuracy and attaining high speed rotation especially in high speed cutting with a small-diameter tool. SOLUTION: A main shaft 1 is supported in a housing 3 by bearings 7, 9, and a driving source 5 is contained in the housing 3. A support part of the main shaft 1 by the bearings 7, 9 and a chuck means 8 are formed by an integrated member. The chuck means 8 is formed by providing the tip of the main shaft 1 with a tool fitting hole 2 in which a shank part of a tool 4 is interference-fitted. The chuck means 8 enlarges the minimum inside diameter of the tool fitting hole 2 by thermal expansion to attach and detach the tool 4. The chuck means 8 may elastically deform the tool fitting hole 2 with external force to attach and detach the tool 4. The bearings 7, 9 are respectively hydrostatic gas bearings. In the hydrostatic gas thrust bearing 9, the rear end face 1a of the main shaft 1 is a baring surface. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a door opener, by which a door open-close unit is miniaturized and lightened and a door can be opened efficiently by only one of the operation of a touch switch and which is silent. SOLUTION: In the slide screw type door opener opening the rotary type door 10 in which one end section is supported rotatably by a hinge, the door opener has a bottomed cylindrical housing 3, a bottomed pusher 6 being internally inserted into the housing 3, being retractably movable by a double-surface forming 6c and 6c shape and being irrotationable, a screw shaft 5 turned by the driving force of the motor 2, a nut 7 being screwed to the screw shaft 5, being internally inserted into the pusher 6, being retractably movable by the double-surface forming 7b and 7b shape and being irrotationable, and a spring 8 housed in an annular space formed of one end face 7a of the nut 7 and the bottom section 6a of the pusher 6, and the pusher 6 is retracted by the forward and reverse rotation of the motor 2 by engaging the other end face 7c of the nut 7 with the pusher 6. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a constant velocity universal coupling for a propeller shaft having excellent heat-resistant dimensional stability, usable even under the operating condition of a large N-θ value and having excellent durability. SOLUTION: In this constant velocity universal coupling for the propeller shaft with a ball 4 interposed between an inner ring 1 and an outer ring 2, the outer ring 2 has a plurality of linear track grooves 9 axially extending on a cylindrical inner peripheral surface, and the inner ring 1 has a plurality of linear track grooves 8 on a convex outer peripheral surface opposedly to the track grooves 9 of the outer ring 2. Both track grooves 8, 9 are provided in cross arrangement, and the ball 4 is built in the cross part of the track grooves 8, 9. The ball 4 is held by the cage 3 arranged between the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2. The ball 4 is formed of heat resistant steel, and the surface hardness after quenching or carbonitriding is 58HRC or more, and the maximum carbon substance dimension is 8 μm or less.
Abstract:
PROBLEM TO BE SOLVED: To preclude loosening from being generated in a coupled part even when a great moment load is applied to a device, allow precise pre-load control, and provide a proper pre-load level. SOLUTION: This bearing device is constituted by forming a hub wheel 1, a bearing part 2 and a constant velocity universal joint 3 into a unit. One bearing rolling face 14a is formed in an outer joint member 14 of the universal joint 3, an inner ring 10 of a separate body separated from the hub wheel 1 is fit around the outer joint member 14, a shaft part 16 of the joint member 14 is diameter-expanded, and is bitten into a recess 6 formed in an inner circumference of the hub wheel 1 to couple plastically the hub wheel 1 to the outer joint member 14.
Abstract:
PROBLEM TO BE SOLVED: To suppress a substantial reduction in allowable load torque of an inner ring with a simple means even when a contact ellipse of a ball reaches an axial end of the inner ring, by sliding the ball simultaneously, when the inner ring slides axially. SOLUTION: A constant velocity universal joint axially forms straight track grooves 26 and 7 respectively on an outer circumference of the inner ring 21 and an inner circumference of an outer ring 2 in oppositely inclined relations to the axis, insets the balls 3 in cross portions of both track grooves 26 and 7, and holds the balls 3 by means of a cage 4 arranged between the outer circumference of the inner ring 21 and the inner circumference of the outer ring 2. The outer circumference of the inner ring 21 is inclined for gradual diameter reduction from a cylindrical middle portion 30a to the axial ends 30c, and the axial ends 30c are formed cylindrically. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a reproducing method for a rolling bearing that can simply and inexpensively reproduce a rolling bearing fatigued with use, and a rolling bearing by the application of the reproducing method. SOLUTION: The method for the rolling bearing, is the method for a used rolling bearing, and comprises a process of setting an margin of removal of a surface layer of at least either member of a bearing ring and a rolling element of the used rolling bearing, and a process of removing the margin of removal of the surface layer of the member. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To improve either of two inconveniences of leakage of lubricant and invasion of foreign objects from the outside without increasing contact torque of a seal portion. SOLUTION: A seal member 5 is comprised of a rubber-like elastic body 7 and core metal 6. The seal member 5 is fixed in an outer ring 2 and is opposed to a seal groove 9 of an inner ring 1. The elastic body 7 is provided with a lip supporting portion 7a, an inner lip 11 extending inward, an intermediate lip 12, and an outer lip 13. The inner lip 11 is arranged to keep in contact with a seal groove inner sidewall 9b. The intermediate lip 12 is provided with a parallel pointed end portion 12a approximately parallel to a axial direction of a bearing against a seal groove bottom surface 9a and is also arranged to be in non-contact with the seal groove bottom surface 9a. The outer lip 13 has an opposing portion to an outer peripheral surface of a shoulder portion 1c of outside the bearing rather than a seal groove 9 of an inner ring and is also arranged to keep in non-contact with the outer peripheral surface of the shoulder portion 1c via a gap existed between the outer lip and outer peripheral surface of the shoulder portion. COPYRIGHT: (C)2003,JPO