38results about How to "Reduced ground area" patented technology

Various planar inverted-F antenna configurations may include an antenna element formed on the top of a PCB and a ground element formed on the bottom of the PCB. Two or more slots may be included in the antenna element for reducing the antenna area while maintaining a suitable impedance bandwidth. A slot may be included in the ground element for reducing the ground area while increasing radiation efficiency. A folded ground may be formed on the top of the PCB for reducing system area while maintaining suitable performance. By moving the folded ground closer to the antenna element and increasing the PCB thickness, significant reductions in system area may be achieved, while maintaining or improving performance in terms of radiation pattern, radiation efficiency and impedance bandwidth.

In the invention, a tread surface is provided with a groove portion including a main groove continuously extending in a tire circumferential direction, and a land portion including a rib or a block separated by the main groove, wherein the land portion includes a first edge portion having a depression row formed by arranging long hole shaped depressions extending along the groove portion in the tire circumferential direction and a second edge portion extending along the main groove while being different in position in a tire width direction from the first edge portion, and not having the depression row.

A vertically mounted and magnetically driven power generation apparatus includes a transmission mechanism vertically mounted in a support frame with a spindle thereof connected with a power generator. Multiple magnetic drive assemblies are respectively mounted inside multiple shelves of the support frame. By virtue of magnetic repulsion between the magnetic drive assemblies and multiple magnetic driven members mounted on the transmission mechanism, the spindle can be vertically and suspendedly rotated within the support frame. The power generation apparatus further includes multiple magnetically stabilizing modules that provide radial or axial magnetic repulsion to the transmission mechanism so as to reduce left-and-right swing or up-and-down vibration when the spindle is rotated within the support frame. Accordingly, the power generation apparatus can achieve superior stability and optimal power generation efficiency upon high-speed operation.

An object of the present invention is to provide a pneumatic tire that ensures both of the on-ice braking performance and the dry braking performance. In order to achieve the object, a pneumatic tire comprises a tread surface (1) including a land portion in which a plurality of sipes (3) are formed, wherein each of the sipes (3) includes a reference plane (B) extending in a depth direction of the sipe from a wavy or zigzag line in the surface of the land portion and each of the sipes is formed with a convex portion having a convex shape in a vertical section with respect to the reference plane (B) in a top area at the front side and the rear side thereof. Preferably each of the sipes (3) is further formed with a concave portion (4) having a concave shape in the vertical section with respect to the reference plane in a top area at the front side and the rear side thereof. The concave portion (4) includes a flat plane portion located at the convex portion (5) side as viewed in the depth direction of the sipe extending in the width direction (WD) of the sipe, and the convex portion is connected to the flat plane portion (4a).

A metal and rubber combined type wear-resisting crawler belt comprises a crawler belt body, wherein, a metal framework is arranged in the crawler belt body, the metal framework comprises a crawler belt support face and a crawler tooth driving face, a wear-resisting platform is arranged at the bottom of the crawler tooth driving face, all areas, except for the wear-resisting platform, of the metal framework are wrapped inside a rubber layer, rubber teeth are arranged on the rubber layer, and the rubber teeth which are located at the position of the wear-resisting platform protrude downward to form a rubber boss; driving teeth are arranged on an outer surface layer of the crawler belt body, and meanwhile an inner surface layer of the crawler belt body is provided with driving grooves and limiting teeth; in addition, the crawler belt support face and the crawler tooth driving face of the metal framework are connected through metal frame supports. According to the metal and rubber combined type wear-resisting crawler belt, a variable cross-section structure is adopted, when a crawler vehicle is driven on a hard surface ground, under the action that the rubber boss and the wear-resisting platform are in contact with the ground simultaneously, the ground contact areas of the driving teeth are reduced, and it is facilitated to lower the abrasion of the crawler belt and reduce diversion resisting moment; when the crawler vehicle conducts field operation, the driving teeth are all in contact with the ground, so that it is facilitated to improve the driving capability of the crawler belt.

The invention provides a pneumatic tire which can uniformly improve the noise performance, snow rode performance, and ice rode performance. The pneumatic tire is provided with a center pattern block (5) and a middle pattern block (6). The two pattern blocks are provided with a plurality of sipes (14). A central transverse groove (4A) is inclined at an angle in the range of 5-20 degrees, and the average groove width is 7-15% of the maximum length (L3) of the center pattern block. A middle transverse groove (4B) is inclined at an angle in the range of 5-25 degrees, and the average groove width is 7-11% of the maximum length (L4) of the middle pattern block (6). In the grounding surface under the standard load state, the tire circumferential distance (La) of a first intersection point (K1) and a second intersection point (K2) is 0.75-1.00 times of the difference (L5-L6) of the length of the grounding surface at the tire equator position (Ce) and the length of the grounding surface at the middle position (6c) of the middle pattern block, and the first intersection point is obtained by the intersection of the central transverse groove and a central main groove (3A), and the second intersection point is obtained by the intersection of the middle transverse groove and the central main groove.