Abstract:
PROBLEM TO BE SOLVED: To provide a calculation method, device and program capable of acquiring a value of accurate rotation torque taking influence caused by variations in a contact state into consideration, which is a problem particular to a four-point contact ball bearing. SOLUTION: A method which calculates rotation torque acting between inner and outer rings of a four-point contact ball bearing, includes an individual torque calculation process (V1) for calculating rotation torque T for every rolling element, and a total sum calculation process (V2) for acquiring the sum of the rotation torque T of all rolling elements to be taken as rotation torque acting between the inner and outer rings. In the individual torque calculation process, the calculation is performed by utilizing information whether a contact state is close to a two-point contact state or a four-point contact state. A four-contact ratio C f which is a ratio of surface pressure of smaller surface pressure to larger surface pressure with respect to respective maximum contact pressures P 1 , P 2 of the respective two raceway surfaces and rolling elements of the inner ring, is employed as the contact state. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a rotary bearing capable of restraining abrasion of a cage or a member contacting with the cage, by reducing weight of the cage, without causing fretting, with a constitution for holding a rolling element by the cage. SOLUTION: This rotary bearing has an inner ring 1, an outer ring 2, a plurality of rolling elements 3 freely rolling between respective raceway surfaces 1a, 1b, 2a and 2b of these inner-outer rings 1 and 2, and the cage 4 for holding the respective rolling elements 3. The cage 4 is made of ceramic. The ceramic is constituted of a sintered body containing βsialon as main component and a residual part of an impurity, or a sintered body containing β sialon as main component, a residual part of a sintering aid and an impurity. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a revolving bearing in the form of a four point contact ball bearing embodied in a constitution using a retainer, reducing the axial direction dimension and sustaining a large rated load. SOLUTION: A plurality of balls 3 held by the retainer 4 are interposed between groove-shaped raceway surfaces 1a, 1b, 2a, 2b of an inner ring 1 and an outer ring 2. The balls 3 make four point contact, in contacting with two curved surfaces 1aa, 1ab, 1ba, 1bb, 2aa, 2ab, 2ba, 2bb which constitute the raceway surfaces 1a, 1b, 2a, 2b of the inner 1 and outer rings 2. The retainer 4 assumes a band form curved in an arcuate shape along the raceway surfaces 1a, 1b, 2a, 2b, and pockets 4a to hold the balls 3 are formed in line in the circumferential direction. The shape of the inside surface of each pocket 4a is such as to contact with the ball 3 at a plurality of points P1 and P2 for each side of the inside surface in the retainer circumferential direction. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent the occurrence of wear or seizure on a guided face by guiding the cage of a tapered roller bearing supporting a planetary rotor which are revolved while rotating on its axis, along the guided face having low contact bearing pressure. SOLUTION: On a small annular portion 5a of the cage 5, a disc portion 5d is provided which is bent from the outer end and extends to the outer diameter side. At the outer periphery end thereof, an annular portion 5e is provided which is bent to the axial inside at a right angle. The inner diameter face of the annular portion 5e is formed as the radial guided face 6 to be guided to a stepped small diameter face 3b provided on the outer diameter face of an outer ring 3. Thus, the contact area of the guided face 6 is increased to prevent the occurrence of wear or seizure on the guided face 6 of the cage 5 of the tapered roller bearing 1 for supporting a planetary gear 15 as the planetary rotor which is revolved while rotating on its axis. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a roller bearing which can relax an edge stress at the boundary between a rolling contact surface of a roller and a roller chamfer while preventing the deterioration of the load supporting capacity of the roller, and further can prevent the difficulty of the mirror finishing operation in the rolling contact surface of the roller and a raceway surface. SOLUTION: Circular recesses 16, 17 having their axes so as to correspond to the axis of the roller are formed on the central portions of respective end faces 12, 13 of the roller so as to reach to the position on the middle side of the roller than the roller chamfers 14, 15. The diameter d of the recesses decreases with the distance toward the middle side of the roller. By this configuration, the boundary portions E1, E2 between the rolling contact surface 11 of the roller and the roller chamfers 14, 15 can easily deform elastically, and the edge stress at the boundary portions E1, E2 can be relaxed, and the decrease of the thickness inside the rolling contact surface 11 of the roller can be reduced. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To compact a traveling reducer by means of a device for supporting a sprocket of a traveling reducer for a construction machine utilizing angular contact ball bearings, and further to elongate the life of the angular contact ball bearings. SOLUTION: The angular contact ball bearing 120 is assembled between the inner periphery of the sprocket 100 and the outer periphery of a housing 110. In both of the outer race 1 and the inner race 3 of the angular contact ball bearing 120, counter portions 7, 11 are formed on the opposite sides to their contact points a, b, c, d in the axial direction. In addition, in the state that the raceway surfaces 2, 4 have come into two point contact with the ball 6, clearances g1, g2 have been provided between the raceway surfaces on the center line C of the bearing and the ball 6. As a result, lubricant can easily arrive at two contact points. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a roller bearing capable of effectively suppress the skew of rollers without generating edge load at both ends of the rollers. SOLUTION: A recessed crowning with a radius of curvature ρ 1 larger than a radius of curvature ρ 0 of a projecting crowning on the rolling surface 3a of the rollers 3 is added to the raceway surface 1a of an outer ring 1, and a projecting crowning is added to the raceway surface 2a of an inner ring 2. Therefore, the contact pressure of the outer ring 1 having an action to geometrically suppress the skew of the rollers 3 on the raceway surface 1a of the outer ring 1 is increased at both ends of the rollers 3 in the axial direction to restrain the rollers 3. The contact pressure of the inner ring 2 having no action to geometrically suppress the skew of the rollers 3 on the raceway surface 2a of the inner ring 2 is lowered at both ends of the rollers 3 in the axial direction to prevent a large tilt moment from acting on the rollers 3 from the raceway surface 2a of the inner ring 2. Consequently, the skew of the rollers 3 can be effectively suppressed without producing edge load at both ends of the rollers 3. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent the occurrence of scratch on a ball by reducing the contact stress of a thrust ball bearing and inhibiting the run out of an oil membrane and the wear on a contact part of the ball to the retainer. SOLUTION: The ball 3 is incorporated between one pair of raceway rings 1a, 1b and the ball 3 is inserted into each pocket 9 by forming a smaller pocket 9 that an opposed space in the retainer circumference direction is larger than the ball diameter of the ball 3 and an opposed space in the retainer diameter direction is smaller than the ball diameter of the ball 3 in an annular plate part 5 having a U-shaped bending part 8 of the retainer 4 retaining the ball 3. The clearance δ of an axial direction formed between the ball 3 and the retainer 4 is made to be below the thickness of the retainer 4 and the center of the ball 3 is always arranged into the edge at upper and lower part of the inner face 9b that opposes to the retainer circumference direction of the pocket 9 and the contact stress is reduced and the run out of oil membrane and the occurrence of wear are prevented at the contact part of the ball 3 to the inner circumference face of the pocket 9 and the forming of scratch on the ball 3 is prevented. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a cage which is used to a large-sized rolling bearing, in particular, a conical rolling bearing in which segments do not interfere with each other when connected in an annular shape, and an excessive force is not generated at a connection part of the segments.SOLUTION: Comb-shaped segments 21a, 21b having axially-protruding cage columns 23 provided at a ring member 22 which is divided into a plurality of pieces in the circumferential direction are arranged at both left and right axial ends of conical rollers 15 which are aligned on a circumference with the phase shifted in the circumferential direction, and the cage columns 23a, 23b of the left and right comb-shaped segments 21a, 21b are connected to each other by being radially alternately overlapped on each other, thus constituting a cage 16.