65results about How to "Reduce side load" patented technology

Devices, tools and methods for performing minimally invasive surgical procedures. Methods of performing minimally invasive ablation procedures. Methods of performing rapid exchange of tools in a device while the device remains in a reduced-access surgical space.

A multiple watt-linkage force transfer mechanism is provided for an internal-combustion engine. The force transfer mechanism comprises two “bell cranks” that are used to drive a single crankshaft through a watt linkage mechanism. Each bell crank, in turn, is driven by two pistons through corresponding watt linkage mechanisms. The watt linkages connected to the pistons enable the connection ends of the pistons to travel along substantially straight paths, significantly reducing side loads against the piston walls. Also, all four pistons preferably drive a single connecting rod. This changes the role of the crankshaft—and the corresponding strength and rigidity requirements for the crankshaft—by reducing the necessary number of rod journals and main journals on the crankshaft.

A coupling for fuel pipe includes a pipe end fitting, which includes a male outer surface including a groove and a female inner surface including a groove. The coupling includes a double-walled socket including a female outer socket and a male inner shaft. The pipe end fitting is accommodated in the region between the female outer socket and the male inner shaft. A first seal ring seals between the female inner surface and the male inner shaft. A second seal ring, which may be substantially coplanar with the first, seals between the male outer surface and the female outer socket of the double-walled socket. The coupling may be so arranged that the pipe end fitting and the double-walled socket are able to pivot relative to each other by up to at least ±2 degrees and are able to slide both towards and apart from each other.

A fluid-working machine for a renewable energy generation device, the fluid-working machine comprising a ring cam and a plurality of working chambers, the ring cam having an annular working surface extending around an axis of rotation of the ring cam, the annular working surface defining a plurality of waves, each working chamber having a piston, each piston in operative engagement with the ring cam working surface, the ring cam and working chambers being mounted to rotate relative to each other, cycles of working chamber volume being thereby coupled to rotation of the ring cam relative to the working chambers, characterised in that the individual waves of the ring cam working surface have an asymmetric profile.

A hydraulic machine in which the volume of working fluid displaced by each cylinder is selectable on each cycle of working chamber volume by active control of one or more electronic valves has a controller configured to select specified groups of cylinders to repetitively carry out active cycles until a change in selection is made. The groups are selected to reduce torque ripple and/or bearing side load. The cam profile may be varied to further reduce torque ripple.

A rotational float system (44) that is meant to be used with existing side load protection systems and that may be selectively operated to permit a digger derrick rotation motor (20) or other rotatable equipment to freely rotate toward a side load to ease operation of and prevent damage to the digger derrick (10) and to assist in the correct installation of screw anchors. The rotational float system (44) includes valve structure (46) interposed between the ports (32, 34) of a hydraulic rotation motor (20) and a control mechanism (48) for selectively opening and closing the valve structure (46). The valve structure (46) is normally biased to a closed position and the control mechanism (48) is normally open. When the control mechanism (48) is operated, it opens the valve structure (46) to connect the ports (32, 34) of the rotation motor (20) to one another. This allows the pressure of the hydraulic fluid present at each of the ports (32, 34) to equalize so that the rotation motor (20) may float or rotate toward any external side loads.

A dental handpiece having a distal end including an attachment for assembly of a removable workpiece and a handpiece body intermediate a proximal end and the distal end. The handpiece extends in a substantially axial direction. A coupler is included having a cylinder portion and a supply-end portion, the cylinder portion being assembled into the handpiece extending in the axial direction toward the distal end. The cylinder portion includes at least one seal that interfaces with an interior of the body so as to isolate a portion of the body interior into at least one distinct chamber. The supply-end portion of the coupler extends from the proximal end of the handpiece body at an angle from the axis. The supply-end portion also includes a plurality of outlets, the at least one distinct chamber in fluid communication with one of the outlets of the plurality of outlets.

A retainer and spring with threaded end are machined from a single piece of material for threading to a piston in a closed cycle cryogenic cooler. Since the machined retainer and spring are a unitary part, they cannot rub against each other during operation of the piston which reduces debris generation. The spring is preferably formed as a double start helix which further increases axial stability and reduces side loading. The spring extends into an integrally formed, threaded end at the end thereof opposite the retainer. The spring is therefore solidly connected to its adjoining parts which greatly reduces tilting and off-axis movements inherent in the prior art, wound spring designs.

The invention proposes an annular porous gas turbulence structure of a solid rocket motor gas flow regulating device, which premixes and evenly distributes the high-temperature and high-speed incoming gas, reduces the uneven erosion and aerodynamic impact of the gas on the valve core of the flow regulating device, and can also be used To filter some of the bulky debris entrained in solid rocket motor gases. The annular porous gas turbulence structure can process multiple air holes on the annular turbulence structure according to the incoming flow direction. The shape and number of air holes can be adjusted according to the area of ​​the gas inlet and nozzle outlet. The periphery of the spool of the regulating device is fixed between the gas inlet and the spool of the flow regulating device through mechanical and adhesive means. The invention not only has the characteristics of simple structure, compactness, easy molding, convenient assembly, high temperature resistance, reliable operation, etc.; it also plays the role of premixed gas flow, uniform distribution of gas, and reduces local erosion and ablation of high-temperature and high-speed gas on the gas flow adjustment device. .

The invention relates to a main transmission mechanism of a servo numerical control rotary head press, wherein two electrical motors with middle torque and small inertia are connected to a precise ball screw with large lead by a safety coupler mounted in a bracket and with a pulse unloading function; a small angle rolling wedge driving mechanism, a screw nut and a ball guide rail slider are fixed together; a ball guide rail and a rack are fixed; a wedge drives a roller and a punch to move up and down; and the two electrical motors are controlled by a synchronous driving method. The mechanism related by the invention can be used for improving the rigidity, transmission precision, fatigue life, abrasive resistance and high-speed servo impact carrying capacity of the main transmission overall mechanism, and reducing the friction of the transmission system and the lateral load of the punch; by using the two electrical motors with middle torque and small inertia, the requirements of carrying and high dynamic response are satisfied synchronously; the key performance for accelerated reciprocating movement of the system can be ensured; the selection difficulty of the servo driving electrical motor and the manufacture cost of the whole machine are reduced; and the plurality of electrical motors are driven synchronously, so that the feasibility for realizing large-tonnage drive systems is improved.

The invention provides a Y-direction assembly of a numerical control carving machine. The Y-direction assembly comprises a left guide rail and a right guide rail which are arranged on the two sides of a tool body and a left Y-direction rack and a right Y-direction rack which are arranged on the tool body. A left column and a right column are movably connected onto the tool body through the left guide rail and the right guide rail. A left Y-direction drive motor and a right Y-direction drive motor are arranged on the left guide rail and the right guide rail respectively, left and right Y-direction drive motor spindle gears are arranged on spindles of the left and right Y-direction drive motors respectively, and left and right Y-direction large gears and left and right Y-direction small gears are arranged on the left column and the right column respectively. The left and right Y-direction large gears are connected with the left and right Y-direction small gears through transmission shafts respectively, the left and right Y-direction drive motor spindle gears are meshed with the left and right Y-direction large gears respectively, and the left and right Y-direction small gears are meshed with the left and right Y-direction racks respectively. The Y-direction assembly is flexible in walking, easy to control and capable of improving the carving accuracy and the service life effectively.

A fluid-working machine for a renewable energy generation device, the fluid-working machine comprising a ring cam and a plurality of working chambers, the ring cam having an annular working surface extending around an axis of rotation of the ring cam, the annular working surface defining a plurality of waves, each working chamber having a piston, each piston in operative engagement with the ring cam working surface, the ring cam and working chambers being mounted to rotate relative to each other, cycles of working chamber volume being thereby coupled to rotation of the ring cam relative to the working chambers, characterised in that the individual waves of the ring cam working surface have an asymmetric profile.

A fall protection apparatus includes a heavy support base with a pivotal mast having a top member for rotation around the axis of the mast carrying a series of booms pivotal about respective vertical axes, each having an end coupling member for receiving a fall restraint harness. Each boom is formed by a tube which fractures on a fall and an elongate stainless steel strap inside the tube which bends without fracturing. The mast includes a series of telescopic rectangular mast sections with a winch driven cable and pulley arrangement for extending the first section which acts to pull the second inner section to the extended position as the first inner section moves out of the outer section. Each section includes first and second pulleys mounted at the same face of the section with the cable located between the face of the section and the face of the next section.