14 results about "Ball diameter" patented technology

The application discloses a bearing steel ball grinding tool, a parameter design method and a use method, and mainly relates to the bearing machining technical field. The bearing steel ball grinding tool comprises a fixed grinding disc and a movable grinding disc arranged at the bottom of the fixed grinding disc. The top of the movable grinding disc and the bottom of the fixed grinding disc are both provided with annular V-shaped grooves. The angle of the tip of the V-shaped groove is 90 degrees. Circular arc grooves are arranged on the two inner walls of the V-shaped groove. The center point of the circular arc groove is a pure rolling point of the steel ball. The bisector of the angle formed by the connecting line of the center points of the two circular arc grooves and the center of the steel ball coincides with the center line of the V-shaped groove. The application can effectively improve the coverage of the grinding tool grinding track network on the surface of the steel ball, effectively reduce the spherical deviation and the spherical diameter variation of the steel ball after grinding, and improve the final grinding precision.

The invention discloses hub bearing ball double-channel assembling equipment, and belongs to the field of assembling equipment. Comprising a workbench, a mounting cover is arranged on the workbench, and the mounting cover is provided with an auxiliary plate; the feeding assembly is arranged on the auxiliary plate; the rotating assembly is arranged on the workbench; the moving assembly is arranged on the workbench; and the adjusting assembly is arranged on the supporting part, and the adjusting assembly is arranged on the supporting part. According to the hub bearing ball double-channel assembling equipment, through double-channel feeding of the feeding assembly, the conveying part and the sensing part, efficient conveying of balls is achieved; the rotating assembly drives the holder to stably rotate, and the moving assembly accurately positions the material conveying part; the adjusting assembly dynamically adjusts the assembling clearance, the fine adjustment part controls the distance, the difference value between the distance and the ball diameter is reduced, vibration is restrained, ball deviation is reduced, manual adjustment is not needed, intervention is reduced, and the assembling efficiency and precision are improved.

The present invention makes it possible to realize a bearing that can be applied under high-speed rotation conditions. In this ball bearing, when Da represents the ball diameter, D represents the bearing outer diameter, d represents the bearing inner diameter, and PCD represents the pitch circle diameter of a ball (5), the minimum wall thickness t in the axial direction of an annular part (11) at the bottom of a pocket (12) is 15-30% of the ball diameter Da, the bearing inner diameter d is 25-55 mm, the bearing outer diameter D is 50-90 mm, the bearing width H is 10-20 mm, the ball diameter Da is 7 / 32 inches or less, and the ratio of the value that is specified by 1 / 2 of the difference between the pitch circle diameter PCD and the bearing inner diameter d with respect to the bearing inner diameter d is 10-20%.

A groove curvature radius ratio Ri of the inner ring raceway groove to a ball diameter is 54% to 58%, a groove curvature radius ratio Ro of an outer ring raceway groove of an outer ring to the ball diameter is 51% to 58%, and Ri−Ro≥0 points. At least an inner ring raceway groove of an inner ring has a maximum surface pressure of 4.7 GPa to 6.0 GPa when a sum of permanent deformation amounts of the ball and the inner ring raceway groove at a center of a contact portion between a ball of an angular ball bearing and the inner ring raceway groove is 1 / 10,000 of the ball diameter. Accordingly, it is possible to provide the angular ball bearing that can reduce the heat generation amount, and that can reduce the damage caused by the external impact load in the stationary state.

The invention provides a falling ball testing device, and the device comprises an objective table which is used for bearing a to-be-detected object; the lifting part is connected with the objective table; the ball falling mechanism comprises a placing table and a supporting frame, the supporting frame is installed on the lifting part, and the placing table is arranged above the objective table through the supporting frame; wherein the placing table comprises a placing surface used for bearing the falling balls, and the placing table is movably installed on the supporting frame so as to release the falling balls. According to the falling ball testing device provided by the invention, the placement surface of which the bottom is used for supporting the falling balls is adopted, so that the falling balls made of various materials such as magnetic and non-magnetic materials can be compatible, and the defect that an electromagnetic adsorption mode is limited for testing the materials is overcome; after falling balls with different diameters are placed through the placing surface, the impact heights of the falling balls relative to the objective table are consistent, so that test errors caused by diameter changes of the falling balls are eliminated; therefore, the accuracy, the applicability and the reliability of the test are improved.

Externally mounted ball screw, featuring: • a spindle shaft (10), • a screw nut (20) which can be placed on the spindle shaft (10) and is provided with a through hole (24) with an opening edge (241) which is continuously connected by a ball path (T1) which is arranged between the screw nut (20) and the spindle shaft (10), • several bearing balls (30) which can roll along the ball path (T1), wherein the diameters of the bearing balls (30) are defined as ball diameters (BD), and • a rotating component (40) connected to the screw nut (20) and provided with a running groove (41) which is continuously connected to the through hole (24) and is formed with a pivot segment (411) connected thereto, wherein the end of the pivot segment (411) connected to the through hole (24) is formed with a coupling edge (411A) which presses against the opening edge (241), wherein the connection of the opening edge (241) to the coupling edge (411A) is not arranged tangentially, wherein the pivot segment (411) can rotate about a reference point (A) and the outer wall surface (411B) of the pivot segment (411) is arc-shaped with this reference point (A) as the center of a circle, which is located away from the outer wall surface (411B) by a radius of curvature (R), wherein the radius of curvature (R) is greater than or equal to the 1.2 times the diameter of a sphere (BD) or less than or equal to 1.5 times the diameter of a sphere (BD).

This invention discloses a table tennis serving device, characterized by comprising a pair of compression wheels arranged side-by-side at the end of the ball delivery channel. The middle of the compression wheels is positioned directly opposite the center of the ball delivery channel. The compression wheels are connected to a compression motor and can be driven to rotate outwards relative to each other, forming a launch port on the outer side of the compression wheels. The distance between the side-by-side compression wheels is smaller than the diameter of the table tennis ball, and the difference between the two is smaller than the compression deformation limit of the compression wheels and the table tennis ball. This method relies on the relative rotation of the compression wheels to impart launch speed to the table tennis ball, achieving a mechanical serving effect without noise or interference from airflow, avoiding the drawbacks of pneumatic serving and making it more suitable for live ball training.

A ball bearing having a pair of raceways composed of an inner race and an outer race, a plurality of balls interposed between raceway surfaces of the pair of raceways, and a retainer that retains the plurality of balls between the pair of raceways, the ball bearing being used in a liquefied gas. The retainer is guided by the inner race, the retainer is rotated by bringing an inner diameter surface of the retainer into sliding contact with an outer diameter surface of the inner race in a manner that a radial gap is determined, and the guide gap of the outer diameter surface of the inner race from the inner diameter surface of the retainer is 3% to 10% of a diameter of the ball, i.e., a ball diameter.

The invention relates to the technical field of turning devices, and provides a turning device for a part with an inner spherical surface and an outer spherical surface, which can realize processing operation of a spherical cavity, is better in applicability, more flexible in cutting operation, simpler in tool replacement, quicker in sphere diameter adjustment of the spherical cavity and better in practicability, and comprises a tool rest and a lathe bed, a left power box and a right power box are arranged at the left end and the right end of the lathe bed respectively, a left chuck is installed on the left power box, a left power structure used for driving the left chuck is installed in the left power box, an inner spherical surface turning assembly is installed on the left chuck and comprises a clamping frame, and the clamping frame is installed in the left chuck in a clamped mode. A centrifugal frame is rotationally connected into the clamping frame, an adjusting arm is installed on the centrifugal frame, a round-edge cutter is connected into the adjusting arm through an inserting rod frame, and a double-positioning piece is installed in the adjusting arm and used for auxiliary positioning of the round-edge cutter in the adjusting arm and auxiliary positioning of the adjusting arm relative to the centrifugal frame.

A ball seat assembly (2) for a downhole tool comprises a collet (6) having a collet shank (8) with an inner collet shank wall (36) and an outer collet shank wall, and collet fingers (10) arranged around a central axis (12) of the collet shank (8) and 5 attached to an uphole end (14) of the collet shank (8); an inner sleeve (34) configured to be axially movable along the inner collet shank wall (36), the inner sleeve (34) having a ball seat (40) and a central flow channel (42) extending through the ball seat (40); wherein the collet fingers (10) have a neutral position creating an uphole opening (26) having a first diameter (D1) and are expandable to 10 a second diameter (D2) larger than the first diameter (D1); wherein in a run-in state of the downhole tool, the inner sleeve (34) is in a first axial position relative to the collet shank (8), in which first position the inner sleeve (34) urges the collet fingers (10) to expand to the second diameter (D2) to allow a ball (44) having a ball diameter (d) less than the second diameter (D2) and larger than the first diameter 15 (D1) to pass through the uphole opening (26) of the collet (6); wherein the inner sleeve (34) is configured to move into a second axial position upon a fluid pressure applied uphole and acting against the ball (44) covering the ball seat (40) and the central flow channel (42), and wherein the ball seat assembly (2) is configured to let the collet fingers (10) snap back into the neutral position, thereby preventing the 20 ball (44) from leaving the collet (6).

Device for setting up a loudspeaker housing, comprising (a) an elongated foot bar (1) which can be attached to the front and rear walls of the loudspeaker enclosure. (b) Fastening means (4) which force-fit the foot bolt to the front and rear wall and optionally provide a positive engagement in a transverse groove (3) of the front and / or rear wall, (c) wherein the fastening means engage screw-typely on countermeasures arranged in the housing structure, in particular on (i) a transverse nut (5) in the side wall of the housing, and / or (ii) Threaded inserts or counter-screw parts in the front or rear panel, (d) a threaded stud (6) with external thread which is screwed into a fine-thread internal bore of the foot bolt and which is adjustable from above by means of a drive engagement, (e) wherein the threaded pin has a conical surface (6a) on its outer side as a contact surface and a ball sleeve (7) inserted into the base is arranged below the pin, which accommodates three balls (8) on a circumferential circle with 120° divisions, (f) wherein each sphere is in contact with the conical surface, a base support of the sphere sleeve and a cylindrical inner wall of the sphere sleeve, (g) wherein the ball sleeve (7) is encapsulated and sealed and forms a lubricant reservoir (10), (h) wherein the force flow into the foot rail, when loads occur about the transverse axis, passes through the side walls, provided that the countermeasures of the foot rail fixing screws include a transverse nut in the side wall. (i) wherein the ball sleeve has an outer diameter D in the range of 10 mm to 20 mm and the ball diameters d K are chosen proportionally to D with a ratio of 0.30 ≤ d K / D ≤ 0.35 (j) and wherein the threaded pin has an axial internal thread for receiving a countersunk screw of nominal size M3 to M5 (11) acting from above, by which the pin is clamped against the foot bolt.

The application provides an outer circulation type ball screw, which comprises a screw shaft, a nut sleeve set on the screw shaft, the nut has at least one through hole, the through hole has an open end edge, a backflow assembly is combined with the nut, the backflow assembly has a rotation groove, the rotation groove comprises a rotation section and a continuation section, one end of the rotation section is communicated with the through hole, the other end of the rotation section is connected with the continuation section, one end of the rotation section connected with the through hole has an abutment end edge, the abutment end edge is abutted to the open end edge, the rotation section rotates around a reference point, the outer wall surface of the rotation section is arc-shaped and takes the reference point as the center, the distance between the outer wall surface of the rotation section and the reference point is a rotation radius, the length of the rotation radius is greater than or equal to 1.2 times the ball diameter, the length of the rotation radius is less than or equal to 1.5 times the ball diameter, and the abutment end edge and the open end edge are abutted in a non-tangent manner.

The invention provides a ball bearing which is light in weight, and has specified rated dynamic load, track ring strength and bearing life. A ball bearing (1) is provided with an inner ring (2), an outer ring (3) provided on the outside in the radial direction of the inner ring (2), and a plurality of balls (4) disposed between the inner ring (2) and the outer ring (3), the diameter of the balls (4) being Dw, the minimum thickness in the radial direction of the inner ring (2) being Hi, and the minimum thickness in the radial direction of the outer ring (3) being Ho. And the value of the ratio Dw / (Hi + Ho) of the ball diameter Dw to the sum Hi + Ho of the two wall thicknesses is in the range of 1.55-2.4 (inclusive).

Provided is an angular ball bearing configured to have an increased number of balls and capable of preventing a decrease in the strength of the entire retainer including a column part. An angular ball bearing (1) is provided with an inner race (2), an outer race (3), a plurality of balls (4) interposed between the inner race (2) and the outer race (3), and an annular retainer (5) having pockets (Pt) for retaining the balls (4). In the retainer (5), each of the pockets (Pt) includes annular parts (7, 8) and a column part (6). The retainer (5) is configured so that the inside diameter or the outside diameter of the column part is in the range of 8% to 50% inclusive of the ball diameter (φDa) from the pitch circle center (P4) of the balls (4). Further, T / dp × 100 is in the range of 0.40 to 1.50 inclusive, where dp denotes the pitch circle diameter of the balls (4), and T denotes the dimension of a part having the narrowest column width in the circumferential direction of the column part (6).