30results about How to "Inhibition of rigidity drop" patented technology

A piezoelectric vibrating piece, a piezoelectric vibrator, an oscillator, an electronic apparatus and a radio timepiece capable of reducing the size while suppressing reduction of rigidity and having excellent vibration characteristics. The piezoelectric vibrating piece includes a pair of vibrating arm portions in parallel to each other, a base portion integrally fixing base end portions of the pair of vibrating arm portions in a length direction, groove portions on main surfaces of the pair of vibrating arm portions and extending along the length direction, where each of the groove portions includes a first groove portion near a tip portion end of the vibrating arm portions and a second groove portion near the base end portion side of the vibrating arm portions with respect to the first groove portion, and the second groove portion is offset in a −X axis direction with respect to the first groove portion.

A pneumatic tire including a closed sipe 5 formed in a tread surface 1 that includes a small hole 2 extending along a tire radial direction and a plurality of cuts 4 extending in a radiation direction from the small hole 2 and that terminating in a land portion 3. A diameter of an inscribed circle of the small hole 2 is greater than a thickness of the cuts 4. The cuts 4 are provided with a twist in a depth direction centered on the small hole 2, and a twist angle θ from a top surface to a bottom surface of the land portion 3 is not less than 10° and less than 135°.

A headrest support structure in which deformation of a tubular support is suppressed. The headrest support structure has a stay extending downward from a headrest, a vertically extending bracket provided to a backrest and having a tubular shape, a vertically extending tubular section having an insertion hole in which the stay is inserted and fitted in the bracket, a first projection projecting from the outer peripheral surface of the upper part of the tubular section and facing the inner surface of the bracket, a second projection projecting from the outer peripheral surface of the vertically middle part of the tubular section and facing the inner surface of the bracket, a third projection projecting from the outer peripheral surface of the lower part of the tubular section and facing the inner surface of the bracket, a first connection section located between the first projection and the second projection, and a second connection section located between the second projection and the third projection.

A pneumatic tire has a plurality of polygonal shallow grooves. The polygonal shallow grooves are formed on a surface of a land portion of a tread surface, for constructing closed loops. The plurality of polygonal shallow grooves formed on one of the land portions have internal regions which are independent of each other.

An internal combustion engine in a power unit includes an oil pump that rotates by a transmission mechanism with an endless chain, and a crankcase with an opening formed by protruding walls of side walls of the crankcase in an axial direction. A drive sprocket is fitted to a main shaft of a gear transmission and a driven sprocket is fitted to a shaft end of a drive shaft of an oil pump. When viewed sideways, the protruding walls and mating faces have overlapping parts that partially overlap the driven sprocket. On the other hand, all the shaft end and the remainder of the driven sprocket are exposed inside the opening when the cover is removed. The resulting configuration improves the working efficiency in fitting an oil pump into the crankcase without reducing the rigidity of the crankcase.

A lower vehicle-body structure is provided which can properly improve the vehicle-body rigidity. The lower vehicle-body structure comprises a vehicle floor (2) comprising a bottom face portion (3) anda floor tunnel (50) which protrudes upwardly and extends in a vehicle longitudinal direction; floor cross members (14) extending in a vehicle width direction; and a connecting member (70) provided tooverlap the floor cross members (14) in the vehicle longitudinal direction and to extend in the vehicle width direction and fixed to at least one of the vehicle floor (2) and the floor cross members(14) at plural fixation positions P1, P2, P3, P4. These plural fixation positions P1, P2, P3, P4 are located at plural different levels in a range of a height of the floor cross members (14).

A pneumatic tire has a plurality of polygonal shallow grooves. The polygonal shallow grooves are formed on a surface of a land portion of a tread surface, for constructing closed loops. The plurality of polygonal shallow grooves formed on one of the land portions have internal regions which are independent of each other.

A tire has a rim protector which is formed at a sidewall and which constitutes an annular protrusion that extends in a tire circumferential direction. The rim protector has not less than two recesses that extend toward the tread region from a location toward the bead region in such fashion as to be directed toward a location in a second direction from a location in a first direction in the tire circumferential direction, the not less than two recesses being arranged with spaces therebetween in the tire circumferential direction. A mutually adjacent pair of recesses among the not less than two recesses are in a positional relationship such that they partially overlap as seen when projected onto a virtual plane perpendicular to a tire radial direction.

A column jacket includes an outer jacket and an inner jacket that are slidable relative to each other in the axial direction for telescopic adjustment. The inner jacket has an outer peripheral surface fitted to an inner peripheral surface of the outer jacket. A base end of an engaging member is fixed to the inner jacket. The inner peripheral surface of the outer jacket includes a guide groove, and a stopper provided at an end of the guide groove. The stopper restricts disconnection of the inner jacket from the outer jacket when being engaged with the engaging member. The engaging member is engaged with the guide groove, and the guide groove guides axial movement of the inner jacket via the engaging member. The guide groove has a bottom portion that faces a distal end of the engaging member.

Provided is a tire that allows improvement of steering stability and wet performance while inhibiting occurrence of uneven wear. A tire 1 includes a tread portion 2, and the tread portion 2 includes acrown land portion 10 disposed on a tire equator C. The crown land portion 10 includes: a first crown edge 7 that extends in a tire circumferential direction on one side of the tire equator C; a second crown edge 8 that extends in the tire circumferential direction on the other side of the tire equator C; a plurality of crown lateral grooves 20 that extend from the first crown edge 7 beyond the tire equator C and terminate in the crown land portion 10; and crown sipes 22 that include first sipe elements 23 extending from the crown lateral grooves 20 toward the second crown edge 8. The first sipe elements 23 intersect the crown lateral grooves 20 at an obtuse angle.

A load transmission member (60) of a construction machine (10) according to the present invention is provided with: an upper column section (64); an intermediate section (62) extending from a position above a lower corner section (C1) of a window edge of the window (53) and outside in the wall width direction (W1) to a position below the lower corner section (C1) and inside in the wall width direction (W1) so as to avoid the window (53); and a beam portion (65) extending below the window (53) so as to be away from the wall portion side edge (E1). The upper column portion, the intermediate portion, and the beam portion are contiguous in this order so as to be able to transmit a load (F) applied to the upper portion of the cab (30) to the upper frame, and at least the intermediate portion of the load transmission member is formed of a single member. As a result, even when a load is applied to the upper part of the cab, it is possible to suppress the occurrence of breakage at a corner-near portion, which is a portion near the lower corner portion of the window edge of the window, thereby suppressing a decrease in the rigidity of the cab.

Provided is a front vehicle body structure capable of improving the support rigidity of a rib-like reinforcement to an apron reinforcement. It has: the hinge column (2), extending along the up and down direction; the suspension shell (6), separated to the front thereof; the skirt plate reinforcement (3), extending forward from the upper part of the hinge column (2), and facing the front and rear direction The intersecting cross-sectional shape constitutes a closed cross-section, which supports the suspension shell (6); the oblique rib-shaped reinforcement (5) extends in a direction inclined downward toward the rear, so that the apron reinforcement (3) The lower part and the hinge column (2) are connected in the shape of oblique ribs, and the section perpendicular to the extension direction constitutes a closed section; and the first reinforcement component (70) is arranged on the inner side of the closed section of the apron reinforcement (3) , separating the closed section in the front-back direction. The bead-like reinforcement (5) has a wheel house outer rear portion (92) extending in a direction inclined downward toward the rear at the bottom, and the first reinforcement member (70) is connected thereto.

A pneumatic tire including a closed sipe 5 formed in a tread surface 1 that includes a small hole 2 extending along a tire radial direction and a plurality of cuts 4 extending in a radiation direction from the small hole 2 and that terminating in a land portion 3. A diameter of an inscribed circle of the small hole 2 is greater than a thickness of the cuts 4. The cuts 4 are provided with a twist in a depth direction centered on the small hole 2, and a twist angle θ from a top surface to a bottom surface of the land portion 3 is not less than 10° and less than 135°.

A front vehicle-body structure that can increase the support rigidity of the apron reinforcement with the bracing reinforcement is provided. The front vehicle-body structure includes: a hinge pillar (2) extending vertically; a suspension housing (6) spaced forward from the hinge pillar (2); an apron reinforcement (3) that extends forward from an upper part of the hinge pillar (2), has a closed section perpendicular to a front-rear direction, and supports the suspension housing (6); a bracing reinforcement (5) that extends rearward to be inclined downward so as to couple a lower part of the apron reinforcement (3) and the hinge pillar (2) in a bracing manner, and has a closed section perpendicular to a direction of the extension; and a first reinforcing member (70) that is provided inside the closed section of the apron reinforcement (3) and partitions the closed section in the front-rear direction. The bracing reinforcement (5) includes, at a bottom, a wheel well outer rear part (92) extending rearward to be inclined downward, and the first reinforcing member (70) is connected to the wheel well outer rear part (92).

Disclosed are a rubber-toughened polypropylene composite and the use thereof. The composite comprises the following components: 45 parts - 69 parts of polypropylene; 15 parts - 25 parts of talc powder; 15 parts - 25 parts of an elastomer; and 1 part - 5 parts of a lubricant, wherein the lubricant is a compound of an internal lubricant and an external lubricant; and the mass ratio of the internal lubricant to the external lubricant is 1 : 4 to 4 : 1. In the present invention, the compound of an internal lubricant and an external lubricant is used in the polypropylene / talc powder / elastomer formulation system, and the compound proportion of the two is controlled to be within a certain range, such that the surface tension of the elastomer and the polypropylene is decreased during blending so as to effectively reduce the average particle size of the elastomer in a polypropylene matrix and promote the good dispersion of the elastomer in the polypropylene matrix, thereby greatly improving the rigidity of the material while ensuring that the material has excellent normal-temperature and low-temperature impact properties, avoiding the problem of a significant decrease in the rigidity of the material, and meeting the need for the development of automobile interior decorating materials.

A golf club head 2 includes a face 4, a crown 6, a sole 8, and a side 10. At least a part of the crown 6, at least a part of the sole 8, or at least a part of the side 10 is formed by a porous part Ps including a porous metal. Porosity on a surface side of the porous part Ps is smaller than porosity on an inner side of the porous part Ps. Preferably, the porous part Ps has skin layers Ls formed on both sides thereof and a core layer Lc formed therebetween. Porosity of the skin layer Ls is smaller than that of the core layer. Preferably, a thickness of the skin layer is 0.05 mm or greater and 0.2 mm or less. Preferably, the whole porous part Ps is integrally formed.

It is to suppress the deformation of a tubular support. A headrest support structure includes: a stay extending downward from a headrest; a bracket provided to a backrest so as to be formed in a tubular shape, and extending vertically; a tubular portion having an insertion hole in which the stay is inserted, the tubular portion being fitted into the bracket, and extending vertically; a first projection portion projecting from an outer peripheral surface of an upper part of the tubular portion, and facing to an inner surface of the bracket; a second projection portion projecting from the outer peripheral surface of a middle part in an up-and-down direction of the tubular portion, and facing to the inner surface of the bracket; a third projection portion projecting from the outer peripheral surface of a lower part of the tubular portion, and facing to the inner surface of the bracket; a first connection portion located between the first projection portion and the second projection portion; and a second connection portion located between the second projection portion and the third projection portion.

A piezoelectric vibrating piece, a piezoelectric vibrator, an oscillator, an electronic apparatus and a radio timepiece capable of reducing the size while suppressing reduction of rigidity and having excellent vibration characteristics. The piezoelectric vibrating piece includes a pair of vibrating arm portions in parallel to each other, a base portion integrally fixing base end portions of the pair of vibrating arm portions in a length direction, groove portions on main surfaces of the pair of vibrating arm portions and extending along the length direction, where each of the groove portions includes a first groove portion near a tip portion end of the vibrating arm portions and a second groove portion near the base end portion side of the vibrating arm portions with respect to the first groove portion, and the second groove portion is offset in a −X axis direction with respect to the first groove portion.