71results about How to "Avoid tensile stress" patented technology

A high-pressure valve assembly includes a flange defining an axis. Projecting into the flange is a valve body which is sealed against the flange by a static ring seal. Provided on one side of the valve body is a spring-loaded closure member which is supported for movement in a direction of the axis to form a suction valve, and on another side of the valve body in opposition to the one side is a spring-loaded tappet which is supported for movement in the direction of the axis to form a pressure valve. A channel connects the suction valve with the pressure valve and has one end porting into a pressure chamber of the valve body adjacent to the pressure valve. The pressure chamber extends in axial direction of the tappet and is sized to extend substantially above a bottom edge of the ring seal.

The invention belongs to the technical field of laser added material manufacturing, and relates to a method for preparing TiAl+Ti2AlNb composite materials by laser melting deposition. The laser melting deposition method is adopted to form the TiAl+Ti2AlNb composite materials; and the feeding quantity of Ti2AlNb is adjusted to achieve a pinning effect in composite material structures to improve overall plasticity of the materials. Meanwhile, circular samples are formed, and scanning paths are changed to concentric arcs to prevent the tensile stress of linear scanning paths of rectangular samples; and concentric circle openings on each layer are converted by 60-90 degrees, that is, the positions of scanning initial points on each layer are changed, so that the thermal stress concentration isreduced to prevent cracks. The heat input quantity in the forming process is controlled, and the substrate preheating temperature in the forming process is adjusted to slow down the formed metal solidification speed and cooling speed, so that the stress is released for a longer time.

A target relative rotational angle Δθt which is created by a steering gear ratio change unit and which is formed by a lower steering shaft relative to an upper steering shaft is calculated on the basis of a steering angle θ, and a post-correction target relative rotational angle Δθta to be created by the steering gear ratio change unit is calculated on the basis of the target relative rotational angle Δθt and a vehicle speed range that has been determined on the basis of a vehicle speed V. Thus, a target relative rotational angle in one lateral direction is so corrected as to be equal to or smaller than a difference between a permissible rotational angle to be defined by a spiral cable in the other lateral direction and a maximum possible rotational angle of the lower steering shaft in the other lateral direction. An electric motor is controlled on the basis of the post-correction target relative rotational angle Δθta.

A piezoelectric power generator that includes a support body, a piezoelectric element, and a bias compressive stress applying member. The piezoelectric element is placed on the support body. The piezoelectric element has a piezoelectric plate that is polarized in the thickness direction, and first and second electrodes that are each provided on a surface of the piezoelectric plate. The bias compressive stress applying member is supported on the side above the piezoelectric element by the support body. The bias compressive stress applying member applies to the piezoelectric element a bias compressive stress acting in the thickness direction of the piezoelectric plate, so that the magnitude of a compressive stress in the piezoelectric plate changes with a change in externally applied stress.

A pin having a contact part may be inserted into a receiving opening in a printed circuit board and anchored in the receiving opening with a press fit. Also, a method provides for inserting a pin into a receiving opening in a printed circuit board, in which the pin is inserted into the receiving opening from one side of the printed circuit board, and a contact part of the pin is anchored in the receiving opening with a press fit. The contact part is inserted into the receiving opening in a contactless manner or with a sliding fit and is subsequently deformed within the receiving opening by expansion transversally to the insertion direction in order to anchor the contact part in the receiving opening with a press fit.

In respect of a clamp arrangement for the centre of a handlebar, which may comprise a pair of spaced clamps or a single clamp, or for securing a cross brace to a handlebar, the provision of a protective component, such as a nylon sleeve or other polymeric insert, between the or each clamp and the bar at the edge margin (or respective edge margins) of the clamp nearest the end of the bar greatly increases the fatigue life of the bar. The protective component is seated in a recess and only extends part way in from the edge of the clamp, so that there is still sufficient direct clamping between the material of the clamp or clamps and the bar to prevent any rotation of the bar.

In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of κ=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

The invention relates to a method for operating a magnetohydrodynamic pump 5 for a liquid-metal anode 1 of an X-ray source.

It is provided according to the invention that it can be operated in at least two modes, wherein the first mode is a thawing mode in which the liquid metal 2 is melted in a line 3 of the liquid-metal anode 1, the second mode is an operating mode in which the liquid metal 2 is pumped through the line 3 and X-ray beams are produced. In addition, the invention relates to a liquid-metal anode 1 for an X-ray source with a liquid metal 2 which is located in a line 3, wherein an anode module 15 is inserted into the line 3 in the region of focus 4, with a pump 5 for circulating the liquid metal 2 in the line 3 and with a cooling system 6 for the liquid metal 2. According to the invention, such a liquid-metal anode 1 has a magnetohydrodynamic pump 5 as described above.

The invention relates to a perspiration pad for insertion into the armpit with an absorbent pad (2) consisting of two mutually bendable sections and a self-adhesive film (3) projecting beyond the edge of the pad. In order to provide advantageous constructional conditions it is proposed that the self-adhesive film (3) is interrupted at least in the bending region of the two sections of the pad (2).

A system and method for electromagnetic surface treatment of a work piece has an electromagnetic pulse generator and an electromagnetic pulse tool. The work piece has a working surface. A current pulse generated by the electromagnetic pulse generator travels through the tool producing an electromagnetic pulse. The electromagnetic pulse interacts with the working surface causing an indentation to form. A residual compressive stress layer is also formed. The indentation has a smooth and continuous topography that is described by an indentation perimeter, an indentation transition region, an indentation sidewall, an impact transition region, and an impact region. The method may also simultaneously, or subsequently, form a second indentation which overlaps with the indentation. An inter-indentation overlap region is formed when the indentations overlap. The inter-indentation overlap region is smooth and continuous. Multiple treated surfaces may easily be formed on the working surface of the work piece.

A convertible vehicle with at least one front roof area, having a flexible covering in the direction of travel, and a rigid roof area, including a rear window. The front roof area includes several lateral frame parts lying one behind the other, which can be folded opposite to each other, at least in the essentially horizontal axes, and can be covered by the rear roof area in the stored position.

The invention discloses a multi-stage speed reducer for a vertical shaft flexible hoisting container, and belongs to the technical field of vertical shaft hoisting transportation. The multi-stage speed reducer comprises a flexible hoisting container, wherein guide rollers are arranged on the left side and the right side of the flexible hoisting container, guide rails matched with the guide rollersare arranged on the left side and the right side of a vertical shaft, and the guide rollers are arranged on the guide rails in a rolling mode; and front and rear symmetrical speed reducers are arranged on the front and rear sides of the flexible hoisting container, the plurality of speed reducers are arranged in the ascending and descending direction of the flexible hoisting container, and the braking torque of the speed reducers at the upper side is smaller than that of the speed reducers at the lower side. According to the multi-stage speed reducer for the vertical shaft flexible hoisting container, multi-stage speed reducing braking is adopted, so that tensile stress or compressive stress generated on the flexible hoisting container due to single use of upper disc braking or lower discbraking is avoided; and the multi-stage speed reducing braking force is decreased progressively from top to bottom, and the balance between the overall inertia pressure and pulling force of the flexible hoisting container is maintained so that the perpendicularity of the flexible hoisting container can still be guaranteed through the dead weight, and the container is prevented from twist deformation and getting stuck in the middle of a shaft.