54results about How to "Reduce torsional stress" patented technology

Systems and methods are contemplated for favorably improving flight dynamics of aircraft, including enhanced aerodynamic braking and improved flight maneuverability. Air braking systems selectively position a first set of blades at a negative thrust pitch to product a net negative thrust across first and second sets of blades, while balancing torque of the drive shafts to zero. First and second sets of IBC blades can be driven by the same shaft or torque-linked shafts. Flight maneuver systems operate a powerplant at a high power mode, and dissipate the energy from the high power output by positioning a first set of IBC blades at a low efficiency pitch while maintaining constant thrust. As increased or rapid flight maneuverability is required, the first set of blades is positioned toward a high efficiency pitch to instantly increase thrust to the aircraft without requiring a related increase in energy output from the powerplant.

A drive control system for a vehicle includes a braking force control mechanism that controls braking forces on the wheels of the vehicle according to a braking operation, a steering characteristic control mechanism that varies the steering characteristic of the vehicle, a determination portion that determines whether an emergency steering operation is likely to de performed when hard braking is being applied, and a main control portion that controls the steering characteristic control mechanism so as to vary the steering characteristic of the vehicle to increase oversteering component of the vehicle if the determination portion determines that an emergency steering operation is likely to be performed.

A circumcision clamp and surgical kit including a rod having a bell-shaped member at a first end for receiving the head of a penis and an engagement structure at an opposing end; a base including: two hinged arms. wherein when closed the arms include at least three upwardly tapered apertures aligned along an arc and having unequal diameters, wherein each upward taper is complementary to the bell-shaped member, at least three fulcrum recesses aligned along an arc and in radial alignment with the at least three apertures; a lever including: a proximal end in radial alignment with the at least three apertures and the at least three fulcrum recesses, a distal end including a fulcrum foot complementary to the at least three fulcrum recesses and adapted for engagement with the engagement structure of the rod; and an adjustment structure for raising and lowering an engaged rod by pivoting the lever at one of the at least three fulcrum recesses.

A suspension arrangement for a wheel suspension of a motor vehicle includes an output lever hinged directly or indirectly to a wheel control element and configured as a flexible spring of defined spring rate. A transverse torsion-bar spring acts on the output lever, with an actuator adjusting a pretension of the torsion-bar spring.

A drive arrangement for a roller curtain covering an opening defined by a frame includes a drum mounted horizontally across one side of the opening, a pair of hollow drive shafts fixed against rotation in opposite ends of the drum, and a pair of coaxial tension shaft portions fixed to the frame and received through respective hollow drive shafts. At least one coil spring is associated with each tension shaft portion, each spring having a first end fixed to a tension shaft portion and a second end fixed to the drum. A pair of drive motors are operatively connected to respective hollow drive shafts for synchronously rotating the drive shafts in order to coil a roller curtain on the drum.

A crankshaft comprising a cheek, a torsion-absorbing pendulum pivotally coupled to the cheek, and a rotational speed actuated brake to oppose motion of the pendulum relative to the cheek. The brake is configured to provide greater opposition to the motion at lower rotational speeds than at higher rotational speeds.

A crankshaft comprising a cheek, a torsion-absorbing pendulum pivotally coupled to the cheek, and a rotational speed actuated brake to oppose motion of the pendulum relative to the cheek. The brake is configured to provide greater opposition to the motion at lower rotational speeds than at higher rotational speeds.

An agricultural haymaking machine intended to be hitched to the lower arms of a tractor comprises a frame supported on the ground by wheels and at least one work device connected to the frame, the frame being in its front part in pivoting connection with a hitching device configured to be connected to the two lower arms, the center of gravity of the machine being situated between the wheels and the hitching device. According to the invention, the projection of the axis of the pivoting connection, on a plane which is substantially vertical and substantially parallel to the direction of advance, has an inclination towards the direction of advance following a direction of the ground upward.

The invention discloses a constant-tension pay-off device and belongs to the technical field of railway bearing conductor erection. The constant-tension pay-off device comprises a support, a rotary shaft rotationally connected to the support, and a winding device which is fixedly arranged on the rotary shaft and used for winding a bearing conductor. The support is connected to a car body, used forbearing the support, in a sliding mode through sliding rail devices. Moving devices and driving devices are fixedly arranged on the support, the moving devices enable the support to move along the sliding rail devices, the driving devices are used for driving the rotary shaft to rotate and provide tension for the winding device, and the force application direction of the driving devices is opposite to the pay-off direction of the winding device. The constant-tension pay-off device further comprises a guide device used for detecting the position of the bearing conductor and providing an actuating signal for the moving devices, and a control device. The constant-tension pay-off device provided by the invention is high in automation degree can be automatically aligned with a tension application device during paying-off, the tension is constant and can be automatically adjusted, friction between the bearing conductor and the ground and dragging are reduced during paying-off, the service life is long, dismounting and mounting are convenient, guiding is stable, and the device is applicable to all pay-off devices.

The invention provides a novel wind turbine blade which comprises a main blade body, a blade tip extension segment and symmetrical little wings. The blade tip extension segment is connected with the main blade body and the symmetrical little wings respectively. The chord length of the blade tip extension segment is in smooth transition from the blade tip chord length to the little wing root chord length. The symmetrical little wings comprise the first little wing and the second little wing. The first little wing and the second little wing are symmetrical to each other. Both the first little wing and the second little wing are provided with lifting airfoils. Both the suction surface of the first little wing and the suction surface of the second little wing face a wind turbine body. The novel wind turbine blade has the advantages that the blade tip vortex is reduced, the blade stress is balanced, the pneumatic efficiency of the wind turbine is improved, the blade root waving moment is lowered, the requirement for the strength level of all components of the wind turbine is lowered, the reliability degree of the components of the wind turbine is increased, and the power generation cost of the wind turbine is reduced.

A suspension arrangement for a wheel suspension of a motor vehicle includes an output lever hinged directly or indirectly to a wheel control element and configured as a flexible spring of defined spring rate. A transverse torsion-bar spring acts on the output lever, with an actuator adjusting a pretension of the torsion-bar spring.

The invention discloses a rear torsion beam structure of an automobile. The rear torsion beam structure comprises a transverse beam, wherein longitudinal beams are respectively arranged at two ends of the transverse beam; a lining sleeve is arranged at one end of each longitudinal beam; a shock absorber bracket is arranged at the other end of each longitudinal beam; hub brackets are arranged at the positions close to the shock absorber brackets on the bodies of the longitudinal beams; the transverse sectional surface of the transverse beam takes the shape of an inverted U; the cross section area of the transverse beam is gradually increased from the middle to two ends in a symmetric manner. Due to the adoption of the transverse beam of which the transverse sectional surface is U-shaped, torsion stress can be dispersed, the adjusting difficulty of torsion rigidity can be greatly reduced, and thus development and design of products can be facilitated; meanwhile, as the torsion stress of the transverse beam is mainly concentrated at two ends, and the middle of the transverse beam is relatively slightly stressed, both the requirement on the torsion rigidity of the transverse beam can be ensured and the space occupied by the transverse beam can be effectively reduced due to adoption of a variable cross section structure which has a small middle and large two ends of the transverse beam, and thus other automobile parts around the transverse beam fittings can be arranged conveniently.

An improved pool skimming net apparatus has a net member including a frame and a net held by the frame. The frame has parallel elongated top and bottom frame portions, an elongated handle member pivotally attached to the top frame portion by an articulated joint member, an elongated retainer member pivotally attached to the top frame portion at a distance from the articulated joint member, a handle clamp member attached to a distal end of the retainer member and adapted to releasably hold a portion of the handle member, and a secondary handle clamp member fixedly attached to the top frame portion at a distance from the articulated joint member and adapted to releasably hold a portion of the handle member, such that when the handle member is held by the handle clamp member an acute angle is formed between the handle member and the top frame portion.

The invention discloses a catenary constant tension pay-off car, comprising a pay-off device fixedly arranged on a road flat car and penetrated through bearing wires in sequence, a guiding device, a tension applying device, a wire column and a control device. A slide rail device and a hydraulic cylinder for moving a bracket along the slide rail device are fixedly arranged on the road flat car. A hydraulic motor is fixedly arranged on the bracket, and the direction of force applying when the hydraulic motor provides tension for a winding device is opposite to the direction of paying-off of thewinding device. The control device comprises a generator set and a hydraulic control assembly; the hydraulic control assembly comprises a signal control assembly and an oil storage device, a hydraulicoil pump and an integrated valve group connected in sequence. The pay-off car has a high degree of automation, the modularization is achieved, the size is small, constant tension is ensured, and thetension is automatically adjusted according to actual conditions during the working process. In addition, the quality of winding is ensured, the service life is long, the disassembly and assembly areconvenient, the orientation is stable, the energy is saved, the emission is reduced, the environmental pollution is low, and the pay-off car is suitable for all catenary pay-off cars.

The invention belongs to the technical field of building construction, and particularly relates to a concrete upright column steel truss. The steel truss comprises a steel frame, an upright column made of reinforced concrete is arranged on the lower portion of the steel frame, and a hoisting trolley is arranged on the steel frame. An installation base is pre-buried in the top of the upright column, and an L-shaped pre-buried steel bar is arranged at the bottom of the installation base. A joint ball is rotationally connected with the interior of the installation base, a bolt is fixedly connected to the top of the joint ball, and the bolt penetrates through an installation hole in the steel frame and is connected with a nut. The steel frame continuously expands and retracts to drive the boltand the joint ball to rotate in the installation base when the temperature difference of day and night is violently changed. The torsion stress borne by the bolt is reduced while it is ensured that the steel frame reliably installs the upright column, the situation that the bolt bears repeated torsion stress for a long time and is broken is prevented, and the potential safety hazard that the steel frame falls off is reduced.

The invention discloses a torsion beam in a passenger car rear axle assembly, and the torsion beam comprises a beam body and a weld joint; the beam body is a bilaterally symmetrical variable cross-section hollow pipe beam and is formed by cold stamping forming and quenched-tempered heat treatment of a high-strength steel round pipe. The weld joint is located near a circular bead of an upper shellof a rectangular area of a torsion beam port and extends to the waist line position of the upper shell in the length direction, the port area is in a rectangular pipe shape subjected to rounding treatment, and the section structure of the middle area is in an inverted V shape formed by folding a closed curve. According to the invention, the high-strength steel seamless welding circular tube is used as a raw material of the torsion beam, so the production cost is greatly reduced compared with a V-shaped opening beam; the forming quality and the production efficiency of the product are improved;meanwhile, the modeling of the torsion beam is optimized through CAE simulation, so the longitudinal rigidity, the lateral rigidity and the roll rigidity of torsion can be effectively improved, the torsion stress of the torsion beam is effectively reduced, and the fatigue durability is improved.

In a coiled tubing assembly for use in a wellbore, the tubing assembly uses longitudinally spaced apart clamping members to clamp two or more coiled tubing members alongside one another. Each clamping member includes a clamping portion extending circumferentially about each coiled tubing member so as to be rotatable in relation thereto, and a connecting portion joined between the clamping portions. A longitudinal positioning element is fixed relative to one of the tubing members in association with each clamping member such that the clamping member remains pivotal relative to the positioning element and the tubing members upon which it is fixed. The longitudinal positioning element thus only restricts the respective clamping assembly in the longitudinal direction along the tubing members without restricting relative twisting between the tubing members.