The present invention relates to a method for manufacturing a universal joint using a pipe. The shaft joint of the universal joint is manufactured by: a material preparation step of preparing a material by cutting a pipe to a predetermined length; a shaft formation step of forming a shaft by reducing the outer diameter of a shaft formation portion by forming the outside of the shaft formation portion with a forming machine; a cutting step of bisecting the non-reduced head formation portion by forming a split across the non-reduced head formation portion in an axial direction; a yoke formation step of forming both opposite members of a yoke in a head by pressing the bisected head formation portion; a pinhole formation step of forming a pinhole across the yoke; and a spline shaft formation step of forming a spline shaft on the outer surface of the reduced hollow shaft.

A ball joint assembly includes a ball stud, a cylindrical bearing, a housing and a retainer. The bearing has an upper end, a lower end, a exterior sidewall, an upper flange located between the upper end and a ring groove formed in the exterior sidewall, a lower flange proximate the lower end and extending outwardly and a socket cavity that opens toward the lower end. A ball portion of the ball stud is retained within the socket cavity. The bearing is secured within a bore within the housing by virtue of the working of the lower flange and the upper flange and retainer located in the ring groove. The ball joint assembly is able to resist a pull-out force of up to 1200 lbs. It may also be sealed by incorporation of a dust boot which extends between the housing and a stud portion of the ball stud.

An outer joint member includes a cutout portion that is formed at least at each corner portion on an opening side of a cup section, which is defined between a radially inner opening end portion of each of track grooves and a radially inner spherical surface portion formed between the track grooves. The cutout portion is configured to prevent a cage from interfering with the outer joint member when the cage is incorporated into the outer joint member. The cutout portion and the track grooves of the outer joint member are finished by cold-forging ironing using a single ironing punch.

The present application relates to a method for producing at least one component for a hydraulic displacement unit, wherein the method is characterized by the steps: prefabrication of a blank component for the at least one component, wherein at least one defined surface region of the blank component is fabricated intentionally with oversize, surface-hardening of the blank component, and final forming of the component from the hardened blank component by removal of the excessive material at the at least one defined surface region fabricated with oversize.

A manufacturing method of a rotating element including a cylindrical fitting portion having a pair of circumferential end portions forming an axial slit between the circumferential end portions, the cylindrical fitting portion being serration-fitted to a rotating shaft, includes: clamping the fitting portion by a clamp jig so that the fitting portion is elastically deformed in an elliptical shape; forming a female serration arranged in an elliptical shape by use of a tool having an elliptical section, the female serration being formed on an inner peripheral surface of the fitting portion elastically deformed in the elliptical shape; and releasing the clamping by the clamp jig so that the arrangement of the female serration is changed to a perfect-circle shape from the elliptical shape.

A universal joint includes a bearing including a bearing cup fitted in a bearing hole of a yoke and rolling elements arranged between the bearing cup and a shaft portion of a cross shaft. A method for manufacturing the universal joint includes: simulating a shrunken state in which a sample bearing cup selected from bearing cups in a same lot is fitted in the bearing hole such that only an outside diameter is restrained, by press-fitting the sample bearing cup into a reference hole of a reference jig; measuring a diameter of an inscribed circle inscribed to the rolling elements in the shrunken state; setting an outside diameter of the shaft portion to a required outside diameter according to the diameter of the inscribed circle; and inserting the bearing cup with the rolling elements between the shaft portion having the required outside diameter and the bearing hole.

The present disclosure relates, according to some embodiments, to a high pressure swivel joint comprising: (a) a first tube comprising: a first tube central longitudinal axis; a first tube interior circumferential surface; a first tube circumferential surface; a first tube first end comprising a male connector comprising a plurality of bearing races; and a first tube second end; (b) a second tube having: a second tube central longitudinal axis; a second tube interior circumferential surface; a second tube circumferential surface; and a second tube first end comprising a female connector comprising a plurality of complimentary bearing races; and (c) a plurality of balls contained between the plurality of bearing races and the plurality of complimentary bearing races, wherein the first end of the first tube and the proximal end of the second tube are configured to connect to form an articulating joint, and wherein the first tube and the second tube comprise a carburizing grade micro-alloy steel, wherein the carburizing grade micro-alloy steel comprises a yield strength of greater than about 110,000 psi, a tensile strength of greater than about 130,000 psi, an elongation of greater than about 14%, a reduction area of greater than about 45%, and a longitudinal Charpy v-notch of greater than about 31 ft/lbs longitudinal at about 40 C., and a nickel concentration of less than about 1 wt. %, by weight of the carburizing grade micro-alloy steel, and a carbon content of less than about 0.15 wt. %, by weight of the carburizing grade micro-alloy steel.

The invention relates to thread joints and can be used in mechanical engineering, equipment construction, the oil and gas industry and communal utility systems.

A method for tightening a thread joint of a base part with a small thread pitch and a part to be attached with a large thread pitch by rotation in screw-in direction of a differential thread connector, comprising portions of a one-directional thread corresponding to the threads of the base part and the part to be attached. The differential thread connector is formed in such a way that it can be screwed on the small thread of the base part to a predetermined length, subsequently the part to be attached is screwed on the large thread of the differential thread connector until contact with the base part is reached, and the preliminary tightening is carried out in screw-in direction, and subsequently the differential thread connector is rotated in screw-out direction and the final tightening is carried out. For instance, the method is applicable for tightening two cylindrical parts, one part 1 with a threaded portion with a pitch S1 and a plane contact surface 4, to another part 2 with a threaded portion with a pitch S2 and a plane contact surface 5, the thread pitch S2 being larger than the pitch S1 by an amount of S=S2S1. A differential thread connector 3 is formed as a coupling with portions with an inner thread with pitches S1 and S2. The method for tightening a thread joint is carried out as follows. The part 1 with the thread pitch S1 is screwed into a threaded aperture of the differential thread joint 3 to a predetermined length A. Subsequently the part 2 with the thread pitch S2 is screwed into the differential thread connector 3 from the opposite end until coupling of the contact surface 5 of the part 2 with the contact surface 4 of the part 1 is reached. In this position the preliminary tightening of the joint with a torque M1 in the direction of the arrow 6 (screw-in) is carried out. Further, while the part 2 is kept immobile, the differential thread connector 3 is rotated around the arrow 7 (screw-out), and the final tightening of the joint is carried out with a torque M2>M1.

A composite open web beam-joist includes a cambered beam-joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam-joist portion. The plate includes a distal end having a flange and a recess.

A manufacturing method is used for an outer joint member of a constant velocity universal joint. The outer joint member includes a cup section having track grooves formed in its inner periphery, which are engageable with torque transmitting elements, and a shaft section formed at a bottom portion of the cup section. The manufacturing method includes welding the cup and shaft members by irradiating a beam to joining end portions of the cup and shaft members, causing an outer surface including the welded portion to be formed into a flat smooth surface by removal processing, irradiating ultrasonic waves to the flat smooth surface with one probe at an incident angle which prevents total reflection in a circumferential angle beam flaw detection method, and setting a focal point of the ultrasonic waves to positions from a surface to an inside of the welded portion, to thereby perform inspection.