A flexible shaft coupling includes a first gear and a second gear meshing with the first gear. The first gear has a first tooth surface, the second gear has a second tooth surface, and at least one of the first tooth surface or the second tooth surface is curved outward when viewed in a tooth trace direction.

A metering and well selection valve group, comprising a rotary type metering distributor with multiple shells; after entering the shells, an elbow extends from one side of shells; the part of elbow positioned in the shells is provided with filtering holes. Filtered fluid outlets are provided on the shells. Multiple check and stop dual purpose angle valves are corresponding to the quantity of shells, each one has a valve with an inlet pipe, a valve stem, a valve base, a valve element is provided on the inside of valve base, a handwheel is mounted on the outer end of valve stem. A first spring is mounted between the spring stop and the valve element. The outlet pipe of filtered fluid is communicated with the outlet of filtered fluid on the case body on the rotary metering distributor. Through the first valve, the extended part of elbow is communicated with the blocking removal fluid outlet chamber on the case body on the rotary metering distributor. In said metering valve group, the control valve is a check and stop dual-purpose angle valve which simultaneously has two functions.

A torque transmission joint transmits torque between a drive shaft and a driven shaft. The torque transmission joint includes: a coupling including: a first concave-convex portion which is provided on one of inner and outer circumferential surfaces thereof and is engaged with a drive-side concave-convex portion of the drive shaft with a gap; and a second concave-convex portion which is provided on the other of the inner and outer circumferential surfaces and is engaged with a driven-side concave-convex portion of the driven shaft with a gap; a drive-side elastic member which is provided between the drive shaft and the coupling to be torque-transmittable; and a driven-side elastic member which is provided between the coupling and the driven shaft to be torque-transmittable. A concave-convex shape of the first concave-convex portion and a concave-convex shape of the second concave-convex portion are different from each other.

A medical instrument with a hollow shaft, a handle at the proximal end, and a tool at the distal end such that the tool is rotatable about the longitudinal axis of the shaft via an actuation rod connected to the handle, the actuation rod composed of two parts, with mutually facing end-face toothing arrangements.

A medical instrument with a hollow shank, at the proximal end of which a handle is arranged, and at the distal end of which a tool is arranged with a stationary jaw part and with a jaw part that is pivotable relative to the stationary jaw part, a distal end region of the shank that carries the tool being designed as a tool tip that can be positioned at an angle with respect to the longitudinal axis of the shank, and the tool being rotatable about the longitudinal axis of the shank respectively about the longitudinal axis of the tool tip. The axially displaceable actuation element for actuating the pivotable jaw part of the tool are coupled to each other in such a way that, on the one hand, when the axially displaceable actuation element for positioning the tool tip at an angle is actuated, the axially displaceable actuation element for actuating the pivotable jaw part of the tool is necessarily movable at the same time in the axial direction, and, on the other hand, the axially displaceable actuation element for actuating the pivotable jaw part of the tool can be actuated independently of the axially displaceable actuation element for positioning the tool tip at an angle.

Drivelines have double conical bearing joints incorporated therein. The double conical bearing joints provide the drivelines with multiple degrees of freedom and allow the driveline to bear load in any direction. The conical bearing joints of the driveline include polycrystalline diamond bearing surfaces.

Disclosed is a cardan shaft sliding assembly suitable for both a gearbox-differential arrangement, which provides the cardan shaft freedom of motion in the axial direction, and for an undercarriage arrangement between two axles. The cardan shaft sliding assembly has multiple mounting diameters of different dimensions positioned on a yoke shaft in order to provide housing and assembly of the protective cover in both the gearbox-differential arrangement and the undercarriage arrangement between two axles. The yoke shaft with the mounting diameters provides the cardan shaft with freedom of motion in the axial direction and is one of the parts forming the sliding assembly.

An adapter is used to connect a first component within a downhole pumping system to a second component within the downhole pumping system. The adapter includes an upstream section adjacent the first component and a downstream section adjacent the second component. The adapter further includes an articulating joint that permits the angular movement of the first component with respect to the second component. The articulating joint includes a flexible metal casing extending between the upstream section and the downstream section.

An outer joint member for a constant velocity universal joint is formed by a face spline forming apparatus and a face spline forming method. The face spline forming apparatus includes a punch member having a tooth portion for forming a face spline, a pedestal having an end-surface receiving surface for receiving an opening end surface of a cup section, and a shaft member having an inner-surface receiving surface for receiving a bottom-wall inner surface of the cup section. The opening end surface and the bottom-wall inner surface are brought into a simultaneous pressure receiving state. In this state, the punch member performs a rocking motion to form the face spline in a bottom-wall back surface due to plastic deformation caused by the tooth portion of the punch member.

An outer joint member for a constant velocity universal joint is formed by a face spline forming apparatus and a face spline forming method. The face spline forming apparatus includes a punch member having a tooth portion for forming a face spline, a pedestal having an end-surface receiving surface for receiving an opening end surface of a cup section, and a shaft member having an inner-surface receiving surface for receiving a bottom-wall inner surface of the cup section. The opening end surface and the bottom-wall inner surface are brought into a simultaneous pressure receiving state. In this state, the punch member performs a rocking motion to form the face spline in a bottom-wall back surface due to plastic deformation caused by the tooth portion of the punch member.