5results about "Combination bearings" patented technology

This utility model relates to the field of ball spline technology and discloses a high-stability rolling guide device with self-lubricating function. It includes a housing, a guide fixedly connected to the inner wall of the housing, an installation mechanism inside the guide, a spline shaft fixedly connected to the inner wall of the guide, and a guide mechanism outside the spline shaft. The guide mechanism includes an upper cover, the inner wall of which is slidably connected to the upper middle part of the outer wall of the spline shaft, a lower cover bottom structure slidably connected to the lower middle part of the spline shaft, and a lower cover top structure slidably connected to the top of the lower cover bottom structure. Multiple protrusions are fixedly connected to the inner walls of both the upper cover and the lower cover bottom structure. In this utility model, the third and fourth sliding grooves have a certain inclination, allowing the high-speed running balls to smoothly bend and turn, reducing the impact on the upper and lower covers, averaging the force at each stage, and reducing the pushing phenomenon during high-speed operation of the device.

The present invention provides a ball screw that prevents lubricant leakage during normal use and allows for easy discharge of old lubricant when supplying new lubricant, thereby preventing seal damage and maintaining good lubrication. [Solution] The ball screw 10 comprises a screw shaft 20 having a screw groove 21 formed on its outer circumference, a nut 30 having a screw groove 31 formed on its inner circumference, a plurality of balls 22 that roll along a load trajectory formed by the screw groove 21 of the screw shaft 20 and the screw groove 31 of the nut 30, and a sealing member 50 attached to the axial end of the nut 30 to seal the gap 12 between the screw shaft 20 and the nut 30. The sealing member 50 has a lubricant discharge portion 13, which is closed when the pressure inside the nut 30 is equal to the pressure outside the ball screw 10, and opens to penetrate the screw shaft 20 in the axial direction when the pressure inside the nut 30 increases.

A rocking table includes a base portion, a linear motion mechanism including a rail attached to the base portion and a slider relatively movably attached to the rail, a driving source causing the slider to perform a linear reciprocating motion, a first support portion attached to the slider and performing a linear reciprocating motion together with the slider, a first rolling bearing attached to the first support portion, a table portion capable of performing a rocking motion with power transmitted from the driving source, a second support portion supporting the table portion, a second rolling bearing attached to the second support portion, and an eccentric shaft including a first shaft portion and a second shaft portion arranged eccentrically with respect to the first shaft portion, the first shaft portion being supported by the first rolling bearing, the second shaft portion being supported by the second rolling bearing.

The present invention can prevent leakage of a lubricant during normal use, can easily discharge old lubricant when lubricant is supplied, prevents damage to a seal, and can maintain a good lubrication state. A ball screw (10) comprises: a screw shaft (20), in the outer peripheral surface of which is formed a screw groove (21); a nut (30), in the inner peripheral surface of which is formed a screw groove (31); a plurality of balls (22) which roll in a load track that is constituted by the screw groove (21) of the screw shaft (20) and the screw groove (31) of the nut (30); and a seal member (50) which is attached to an axial end part of the nut (30) and which seals a gap (12) between the screw shaft (20) and the nut (30). The seal member (50) has a lubricant discharge part (13). The lubricant discharge part (13) is closed in a state where the pressure inside the nut (30) and the pressure outside the ball screw (10) are the same, and opens to allow passage therethrough the axial direction of the screw shaft (20) when the pressure inside the nut (30) increases.

A bearing seat arrangement is provided, comprising a first bearing seat (11), a second bearing seat (12), and linear bearings (13) arranged between them. A convex section (121p), projecting towards a first lower section (111) of the first bearing seat (11), is formed in the middle section of a second lower section (121) of the second bearing seat (12), and a recessed form (121c) is formed in a direction away from the first lower section (111) in a part of the second lower section (121) between the convex section (121p) and both end sections of the second lower section (121).Opposite the convex section (121p), a concave section (111c) is formed in the first lower section (111). The concave section (111c) has an opening that is open towards the convex section (121p), and the convex section (121p) is inserted through this opening into the concave section (111c). This optimizes the load distribution and the load magnitude of the second bearing seat and effectively reduces the risk of premature failure of the linear bearings. Furthermore, a converter device is provided, which includes the bearing seat arrangement.