19 results about "Planform" patented technology

To provide a truck in which a wheel part is hardly rotated and a stacked state is easily stabilized in a state that trucks are vertically stacked.SOLUTION: A base part 2 of a carriage 1 has a wheel storage recessed part 4 recessed from a placing surface 20 and storing a wheel part 31 of a caster part 3. The wheel accommodation recess 4 has a bottom surface portion 41 having a circular shape in a plan view, and an annular inclined surface portion 42 inclined at a gradient angle of less than 90 degrees from an outer edge portion 412 of the bottom surface portion 41 to the placement surface 20. The wheel accommodation recess 4 has a central protrusion 5 and a turn regulation protrusion 6. The central convex portion 5 protrudes upward at the central portion 411 of the bottom surface portion 41 and restricts the movement of the wheel portion 31 accommodated in the wheel accommodation concave portion 4. The turning restriction protrusion 6 protrudes upward in the outer edge portion 412 of the bottom surface portion 41 and the inclined surface portion 42, and restricts the turning of the wheel portion 31 accommodated in the wheel accommodation recess 4. The rotation restriction protruding portion 6 has a ridge line 60 extending from a vertex 61 at an upper portion of the inclined surface portion 42 toward the bottom surface portion 41.SELECTED DRAWING: Figure 1

The article according to the present design is used to construct the framework of a cargo handling machine such as a chain conveyor, as shown in the reference plan view showing the state of use and the reference side view showing the state of use.

The embodiment of the present application provides an inducer and a turbopump, which are used for further improving the cavitation erosion resistance of the inducer. The inducer is suitable for a liquid rocket engine, and the inducer comprises a rotating shaft and blades fixed to the rotating shaft; a first development surface corresponding to the blades comprises a first region, and a part of the first development surface located in the first region is in a curve shape; the first development surface is a planar pattern obtained by unfolding a first section surface of the blades which is cut by a cylindrical surface of the rotating shaft on a shaft radius. The inducer and the turbopump provided by the embodiment of the present application can further improve the cavitation erosion resistance of the inducer.

A flight device according to the present invention comprises a body section 1 that has a plurality of vertices 4, 5 positioned on the same circumscribed circle or circumscribed ellipse in a plan view and a plurality of side parts 2, 3 connected across adjacent vertices 4, 5, and the body section 1 being formed in a polygonal shape in plan view. The flight device also comprises arm parts 11, 21 that have frames 12, 13, 22, 23 extended outward from the vertices 4, 5 on one side and the vertices 4, 5 on the other side of the side parts 2, 3. A rotor attached to the arm parts 11, 21 is also provided.

A casing rotator includes control means configured to perform control of leveling a lifting frame, four lifting cylinders are hydraulic cylinders that are arranged at four corners of a virtual quadrilateral defined along an outer edge of the lifting frame in a plan view and that are capable of performing a contracting action and an extending action of applying a press-in force and a pull-out force to a casing, the control means includes a tilt sensor configured to detect a change angle of tilt of the lifting frame with respect to a leveled state, four variable throttle valves forming pairs with the four lifting cylinders and provided in flow passages through which a hydraulic oil flows out from the lifting cylinders in a contracting action state thereof, and a control unit configured to individually adjust throttling degrees of the variable throttle valves based on the detected change angle.

A hub model automatic generation method, system, device and storage medium, the method comprises the following steps: generating a rim section contour according to a rim attribute parameter and a vehicle load value, the rim attribute parameter comprising a rim nominal diameter; rotating the rim section contour around a hub center axis to obtain a rim model according to the rim nominal diameter; generating a mounting portion model according to a mounting portion attribute parameter, the mounting portion attribute parameter comprising a mounting portion thickness; determining the relative position of the mounting portion model and the rim model according to a mounting portion position parameter; generating a web section contour according to the relative position of the mounting portion and the rim, the mounting portion thickness, rotating the web section contour around the hub center axis to obtain a spoke contour model; generating a spoke plane figure according to a spoke style parameter; projecting the spoke plane figure on the spoke contour model to obtain a spoke model; taking a Boolean union of the rim model, the mounting portion model and the spoke model to obtain a hub model.

This invention further improves the wear resistance and late-wear grip performance of tires. The invention is a tire with a tread portion, wherein: a groove is formed on the land portion of the tread surface, the groove having an opening facing the tread surface and a groove bottom, and the groove having a width of less than 2 mm and a depth of less than 20 mm; when the surface of the tread portion is viewed in a plan view, the opening and the groove bottom intersect; when viewed from above on the surface of the tread portion, the ratio X of the area of ​​the intersection of the opening and the groove bottom to the area of ​​the opening is less than 95%; the tread portion is formed of a rubber composition comprising a rubber component and carbon black, wherein the carbon black content (parts by mass) Y is more than 20 parts by mass relative to 100 parts by mass of the rubber component; and X / Y < 4.

A steering system for a watercraft having twin propulsion units whose thrust axes are fixed to diverge outward from a longitudinal centerline in plan view. During a turn, a controller differentially commands thrust such that the outboard propulsion unit produces greater thrust than the inboard unit. The outward alignment of the thrust axes yields a net lateral force whose vertical offset from the craft's center of gravity produces a rolling moment that banks the hull inward toward the turn. The system enables banked turns without swiveling drives or rudders and supports zero-radius maneuvers at low speeds. Embodiments include electric propeller pods or water-jet nozzles, planing and hydrofoil craft, and optional feedback to regulate bank angle.

Provided are a frame unit for a compact rotary-wing aircraft, and a rotary wing using the same. A rotary-wing aircraft 2 comprises a frame unit 10 for the rotary-wing aircraft and an occupant seat 20. The frame unit 10 for the rotary-wing aircraft comprises a reference frame 11, an upper frame 12, and an upper support structure 13 that supports the upper frame 12. The main frame 11 comprises a front member 11F that is positioned at the front of the occupant seat 20, a back member 11B that is positioned at the back of the occupant seat 20, a left member 11L that is positioned at the left side of the occupant seat 20, a right member 11R that is positioned at the right side of the occupant seat 20, and eight rotors 11T that are provided to the front member 11F and the back member 11B. In a plan view along the Z direction, the reference frame 11 and the upper frame 12 overlap with rotational trajectories 11TR of the rotors 11T.

An aerial towed platform flies behind a lead vehicle collecting more power than needed to overcome the drag of the towed platform. The towed platform planform is comprised mostly of a single photovoltaic sheet with lift forces on both the upper and lower surface of the sheet. The camber of the platform is preferably between 0.02 and 0.06 with distributed propulsion able to change camber continuity and increase lift relative to drag. The applications include, but is not limited to, aircraft, trucks, cars, railcars, and boats. The most-preferred application is vehicles with low drag where the solar power can provide more than 30% of the energy needs of the vehicle.

The article relating to the present design is a device used for attaching and detaching a pressure reducing valve seat sleeve. The pressure reducing valve seat sleeve attachment / detachment device relating to the present design is used to attach and detach a cylindrical seat sleeve installed vertically inside a pressure reducing tank in a pressure reducing valve attached to a pressure reducing tank. The pressure reducing valve seat sleeve attachment / detachment device relating to the present design is a device used to lift the seat sleeve upward after being inserted into the cylindrical seat sleeve and hooking onto the lower end of the seat sleeve. It comprises a plate portion that hooks onto the lower end of the seat sleeve, a pair of rod-shaped portions connected to the plate portion, and a fixing member for fixing the rod-shaped portions when attaching the shaft member. The plate portion is a substantially elliptical member in plan view, with a length in the long axis direction that is longer than the inner diameter of the lower end of the seat sleeve and less than or equal to the outer diameter of the lower end, a length in the short axis direction that is shorter than the inner diameter of the seat sleeve, and a length in the thickness direction of the plate portion that is shorter than the inner diameter of the seat sleeve. A through hole with a female thread for screwing in the shaft member is formed through the front and back of the plate portion approximately in the center in plan view. The plate portion is also equipped with a cover member on its surface. The cover member is a plate-shaped member having a rectangular opening in the center. When the cover member is attached, a pair of rod-shaped portions are positioned inside the opening edge of the cover member, and are formed so that the center of the opening and the central axis of the through hole are approximately coincident. The pair of rod-shaped portions are axial members and are connected to the surface of the plate portion by a pivoting portion connected to their base ends, so as to sandwich the through hole opening on the surface of the plate portion. They are mounted so as to be able to pivot approximately 180° along the axial direction of the plate portion with the base end as the pivot point (see Reference Figures 1 and 2 showing the state of use). In other words, the pair of rod-shaped portions are connected to the plate portion so as to pivot from an insertion position where the axial direction of the rod-shaped portion and the long axis direction of the plate portion are approximately coincident, to a hook position where the long direction of the plate portion is approximately perpendicular to the axial direction of the rod-shaped portion. In addition, a male screw portion for fixing a fixing member is formed at the tip of the rod-shaped portion. The fixing member is a plate-shaped member that is approximately circular in plan view, and is formed so that its diameter is larger than the inner diameter of the sheet sleeve.A through-hole for inserting the shaft member is formed in the center of the fixing member, and a through-hole for inserting the rod-shaped portion is formed outside of this through-hole. The shaft member is a shaft-shaped member used to attach and detach the seat sleeve of a pressure reducing valve seat sleeve by connecting it to the pressure reducing valve seat sleeve attachment / detachment device according to the present design. A male threaded portion is formed at the base end, which has rigidity capable of lifting heavy objects, and it can be securely attached to the plate by screwing the male threaded portion into the female threaded portion of the through-hole of the plate portion. The pressure reducing valve seat sleeve attachment / detachment device according to the present design is used as follows: When removing the seat sleeve of a pressure reducing valve attached to the flange of a pressure reducing tank (hereinafter referred to as the tank-side flange) (this seat sleeve is attached so that its axial direction is approximately vertical), with the upper end of the seat sleeve exposed, the plate portion is inserted into the interior from the upper end opening of the seat sleeve (see Reference Figure 1 showing the state of use). At this point, the pair of rod-shaped parts are swung to the insertion position so that the longitudinal direction of the plate part is approximately aligned with the axial direction of the sheet sleeve (in other words, the longitudinal direction of the plate part is approximately aligned with the vertical direction), and the plate part is inserted through the upper end opening of the sheet sleeve and moved down to the lower end opening. Next, with the plate part protruding from the lower end opening of the sheet sleeve, the plate part is swung to the hook position. That is, the plate part is positioned so that the longitudinal axis direction of the plate part, the axial direction of the sheet sleeve, and the axial direction of the rod-shaped part are approximately perpendicular to each other. Next, the rod-shaped parts are moved upward to a position where both ends of the cover member of the plate part in the longitudinal direction catch on the lower end of the sheet sleeve, and the surface of the cover member comes into contact with the lower end of the sheet sleeve (see Reference Figure 2 showing the state of use). In this state, the tip of the rod-shaped part is inserted into the through hole of the fixing member, and moved downward along the rod-shaped part until the fixing member comes into contact with the upper end edge of the sheet sleeve, and the rod-shaped part and the fixing member are fixed with a nut (see Reference Figure 3 showing the state of use). Next, the shaft member is inserted into the sheet sleeve through the through hole in the center of the fixing member. When the base end of the shaft member comes into contact with the plate portion, the base end of the shaft member is screwed into the through hole in the plate portion to attach it and connect the shaft member to the plate portion (see Reference Figure 4 showing the state of use).In this state, by attaching a hydraulic drive device or the like to the tip of the shaft member and operating it to move the shaft member upward, the heavy seat sleeve can be detached from the tank-side flange and pulled upward (see Reference Figure 5 showing the usage state).

The present internal combustion engine has, within a cavity (CA), a bottom wall (510) extending radially outward from a central axis (A) and gradually away from the cylinder head, a plurality of concave walls (520) connected to the bottom wall (510) and curved to be convex radially outward, and a step (550) provided between the bottom wall (510) and the concave wall (520), the step (550) being arc-shaped in geometry in a plan view. Consequently, a spray flame (B2) flowing along the bottom wall (510) flows along the step (550), and accordingly, the spray flame (B2) is separated from the bottom wall (510) (see an area surrounded by a dashed line (VII) in a figure) and directed toward the center of the cavity (CA), which can further facilitate the mixing of fuel with residual air for more efficient combustion.

The invention provides a fusion modeling-based method for rapidly predicting the performance of a wave rider with a fixed plane shape. The method comprises the following steps of: generating a plurality of wave rider shapes combined by different design parameters through a design method of the wave rider with the fixed plane shape; an engineering algorithm is adopted to quickly calculate low-precision aerodynamic data of a large number of appearances to construct a basic database, and a small number of typical appearances are selected to obtain high-precision data through CFD or tests; and aligning and fusing the high-precision data and the low-precision data to prepare a training sample set, inputting the training sample set into a deep neural network for training, and constructing an aerodynamic characteristic prediction model. A user only needs to input the design Mach number, the sweepback angle, the shock wave angle and the attack angle of the target waverider, and the model can quickly and accurately output key performance parameters such as the lift-drag ratio, the lift-drag coefficient and the pressure center position within millisecond time. The problem that precision and efficiency are difficult to consider in a traditional method is effectively solved, the high-precision data requirement and the calculation cost are remarkably reduced, and the design optimization efficiency of the waverider is greatly improved.