1332 results about "Groove width" patented technology

A golf club head comprises a face portion having a front face defining a clubface for hitting a ball and a back face facing a hollow, wherein the clubface is provided along the edge thereof with a frontal groove having a groove width of not less than 0.5 mm, and the back face is provided with a backside groove extending along the frontal groove.

The present invention relates to a pneumatic tire capable of maintaining performance on snow, and improving operation stability and noise performance. A shoulder axial grove (10) comprises a first shoulder axial groove (11) having a groove width of not less than 3.5 mm.; a second shoulder axial groove (12) comprising an axially innermost sipe-like part (12b) having a groove width of 0.5 to 2.0 mm, and an axially outer main part (12a) having a groove width of not less than 3.5 mm. a crown axial groove (7) comprises a first crown axial groove (8) having a groove width of not less than 2.0 mm; and a second crown axial groove (9) comprising an axially innermost sipe-like part (9b) having a groove width of 0.5 to 2.0 mm, and an axially outer main part (9a) having a groove width of not less than 2.0 mm. In addition, the first and second shoulder axial grooves are formed on the tire circumference alternatively; the first and second crown axial grooves are alternatively formed on the tire circumference.

An optical phase-change disc comprises a substrate having thereon a spiral groove or concentric grooves for guiding a focused light beam, and a layer structure including a recording layer and protective layers sandwiching therebetween the recording layer. The groove has wobble for recording ATIP (absolute time information) or ADIP (address information). The following relationship between the groove width GW, beam diameter R0 and wobble amplitude aw: 0.25</=GW/R0</=0.45 or 0.65</=GW/R0; and 0.03</=aw/GW</=0.08 hold for preventing distortion of the groove caused by repeated overwriting operation to improve reliability of the optical disc.

A pneumatic tire including five land portions Q1, Q2, Q3, Q4, Q5 in a tread surface 1 by providing four main grooves G1, G2, G3, and G4 in a ground contact region R of the tread surface 1, wherein positions and groove widths of the main grooves G1, G2, G3, and G4 are specified together with only the land portion Q1 positioned outermost on a vehicle outer side when mounted on a vehicle being formed into a block row, and the other land portions Q2, Q3, Q4, and Q5 being formed into ribs, and a groove area proportion of the tread surface 1 is larger on a vehicle inner side than the vehicle outer side with a tire equator CL and center lines of the land portions Q2, Q3, Q4 as boundaries.

An electronic control device has an enclosure accommodating therein a circuit board and having (a) a first enclosure member which is provided at a connecting part thereof with a seal groove and (b) a second enclosure member which is provided at a connecting part thereof with a convex line that is fitted into the seal groove of the first enclosure member; a protrusion formed on either one of an inner wall surface in the seal groove or an opposing surface, which faces the inner wall surface of the seal groove, of the convex line so as to protrude toward the other surface. The protrusion limits a movement, in a seal groove width direction, of the convex line fitted into the seal groove. The seal groove and the convex line are sealed with a sealant.

The invention discloses turbine-based combined cycle engine super-combustion chamber. Key parts of the super-combustion chamber comprise a shunt ring, a rear area-variable deflation valve, a flow guide tongue piece, a square lobe mixer, a first area fuel ejector, a center cone, a second area fuel injection ring, an evaporation tube flame stabilizer, a heat-isolating screen, a super-combustion chamber cylinder, an outer extending groove-width-variable radial flame stabilizer and an inner extending radial flame stabilizer. An internal flow field of the super-combustion chamber is reasonably distributed, the phenomenon of backflow from a punching duct to a turbofan duct can not occur, flow separation can not occur in the square lobe mixer, and the evaporation tube flame stabilizer can achieve soft ignition of the super-combustion chamber. The whole super-combustion chamber is high in mixing efficiency, little in cold flow resistance, high in combustion efficiency, reasonable in temperature distribution, and capable of meeting use requirements in a whole flight envelope of the super-combustion chamber in each work state and the requirement for boost of an turbofan ramjet.

A communication light detecting device interconnecting light transmission paths and collocated therebetween, comprises: an optical coupling body including a core portion for photo coupling with the light transmission paths, and a light extracting portion for extracting a part of the communication light as a leakage light; and a light detecting portion having a light receiving member for receiving the leakage light. The light extracting portion is preferable to possess a lower refractive index than that of the core portion. Besides, the light extracting portion is preferable to include a light detecting use groove with a groove width of 50 μm or more and 140 μm or less formed by cutting and separating the core portion. Besides, the light extracting portion is preferable to be the optical coupling body in which outer diameter of the core portion is different from the outer diameter of a core of the light transmission path.

A pneumatic tire includes a tread having at least one main groove and a plurality of ribs extending in the tire-circumferential direction. At least one of the ribs has a plurality of narrow grooves formed at intervals in the tire-circumferential direction. At least one intermittent sipe is formed corresponding to at least one of the narrow grooves. The narrow grooves are grooves each having a portion extending substantially along the tire-circumferential direction and having a groove width smaller than the at least one main groove. The at least one intermittent sipe has a plurality of holes that are intermittently formed, and at least one solid part located between adjacent two of the holes. The holes and the solid part are arranged in a direction intersecting the narrow grooves. The intermittent sipe intersects the corresponding narrow groove in the at least one solid part.

A gas turbine shroud includes a ceramic abradable coating superior in abradable property and durability. The gas turbine ceramic abradable coating of the present invention is configured by an abradable metal layer and a porous ceramic abradable layer (hardness RC15Y: 80±3), the porous ceramic abradable layer is provided with slit grooves by machining work, and a slit groove width is 0.5 to 5 mm. Thereby, the abradable property, and durability against a thermal cycle and high-temperature oxidation are improved.

A refining plate for refining lignocellulosic material including: a radially outer peripheral edge and a substrate surface; a refining zone having a plurality of substantially radially disposed bars and grooves between the bars, wherein the bars protrude upward from the substrate surface and the grooves each have a groove width, and a steam channel traversing the bars and grooves of the refining zone, wherein the steam channel has a radially outer end radially inward of the outer peripheral edge of the plate and the steam channel has a width substantially greater than the groove width.

A reflective diffraction grating having grooves and ridges and providing high throughput efficiency in the minus-first diffraction order. All but the zeroth diffraction order and the minus-first diffraction order may be prevented from existence by directing the radiation onto the grating at an appropriate angle. The radiation having a TM polarization is eliminated from the zeroth order by destructive interference by appropriate selection of a the groove width of the grating, and radiation having a TE polarization is eliminated from the zeroth order by destructive interference by depositing an overcoat of an appropriate thickness. A dielectric material may be deposited in the grooves.

A pneumatic tire tread includes center lateral grooves inclined to the reverse direction of the belt cords of the outermost belt ply of the belt, a groove width Wyc of the center lateral grooves being from 1.0 to 6.0 mm, shoulder lateral grooves being inclined to the same direction of the belt cords of the outermost belt ply, the shoulder lateral grooves having a narrow-width portion having a groove width Wys1 of from 0.4 to 1.5 mm at a position where it connects to a shoulder circumferential main groove, and a wide-width portion having a groove width Wys2 of from 2.0 to 8.0 mm which is connected to the narrow-width portion and extends beyond the tread ground-contact edge.

The invention discloses a manufacture method of a short slotted hole for a printed circuit board, aiming at solving the problems of size deviation and deformation when the short slotted hole is machined. The manufacture method comprises the following steps of: S1, carrying out sequential cutter arrangement on a slotted hole which needs to be manufactured by setting the length and the width of a slot in combination with a preset standard according to the shape of the slotted hole, and selecting a proper cutter according to the size of the slotted hole; S2, respectively setting subsidiary slots arranged at two sides of a pre-drilling slot for the designed slot width in a milling way, and setting an adding and amplifying size X on the basis of the normal compensation of a finished product along the length direction of the slot; S3, setting a compensation distinguishment of pre-drilled subsidiary holes arranged at two ends of the slotted hole, wherein a pre-drilling mouth selects a milling cutter of which the ratio groove width is less than or equal to 2X, and reserving the adding and amplifying size X at pre-drilling holes arranged at two ends of the slot from the edge of the slot; S4, carrying out compensating finishing on the whole slotted hole by the milling cutter of which the ratio groove width is less than or equal to 2X; and S5, thickly drilling by the milling cutter from one pre-drilling hole to another pre-drilling hole at a fixed displacement, so that the deformation quantity of the short slotted hole can be reduced.

It is a subject to improve wet performances and noise performances while restricting degradations in dry performances, and for solving this subject, the pneumatic tire is comprised of a tread grounding surface that is partitioned into four to five block regions by three to four main grooves that extend successively in the tire circumferential direction. The main grooves are comprised of one large width main groove which groove width comprises 4 to 20% of a tread grounding width and which is apart from the tire equator by a distance corresponding to 5 to 30% of the tread grounding width further to one grounding end side, and small width main grooves that are disposed between the large width main groove and the other grounding end and which groove width is larger than 2.0 mm but smaller than that of the large width main groove. Both groove side edges of the large width main groove extends in a successive and linear manner in the tire circumferential direction without being interrupted. A ratio ST/SY between a front and rear rigidity ST of the tread grounding surface and a lateral rigidity SY is set to be larger than 0.9 but smaller than 1.1. The lateral rigidity SYs is set to be larger than the front and rear rigidity STs for the shoulder block regions 4s1, 4s2 on both sides. As for the central block region (when the number of main grooves is three, crown block regions 4c1, 4c2, and when the number of main grooves is four, the crown block region 4c2), the lateral rigidity SYc is smaller than the front and rear rigidity STc.

A pneumatic tire provided with a tread pattern on which a plurality of blocks are formed with circumferential grooves which extend along a circumferential direction of the tire and lateral grooves which traverse the circumferential grooves, wherein the lateral groove disposed between the blocks on the endmost tread edge region has a depth from 10 to 50% of a depth of the circumferential groove to be traversed and has a groove bottom concave portion whose both ends in a longitudinal direction are disposed inside the groove bottom, and a width of the groove bottom concave portion, which is determined on the basis of the bottom plane of the groove bottom, is from 25 to 45% of a groove width of the lateral groove.

A thrust dynamic pressure bearing with high inclination-resistant rigidity against axis runout and additionally low bearing loss torque is implemented. Herringbone grooves (131) having intermediate bends (132) are provided on rotating-side bearing surface (11) provided on the rotating-side bearing member. When rotating-side bearing surface (11) rotates in direction A (clockwise), lubricating oil generates dynamic pressure in an area centering on intermediate bend (132) along radially outer part (133) and radially inner part (134) of herringbone groove (131). As a result that groove width (G) of a dynamic pressure generating groove and width (L) of a land adjacent to the dynamic pressure generating groove holds G>L at an arbitrary radius (2) position, a thrust dynamic pressure bearing with high inclination-resistant rigidity and additionally low bearing loss torque is provided.

The invention provides a bipolar plate for flow batteries, which belongs to the flow battery field. The bipolar plate for the flow batteries is characterized in that the bipolar plate comprises an engineering plastic plate and dense graphite plates embedded in the center of the engineering plastic plate in a penetrating manner. Guide grooves for anolyte and catholyte to flow through are respectively formed on the front and the rear lateral surfaces of each dense graphite plate; and two ends of each guide groove are respectively connected with through-holes on the edges of the front and the rear lateral surfaces of the engineering plastic plate, so as to allow the electrolytes to flow through. The guide grooves are connected in series or in parallel or in a mixed connection of parallel and series. The ratio of the ridge width to the groove width of the guide groove ranges from 1:0.5 to 1:6. The engineering plastic plate and the dense graphite plate are matched in a step-shaped manner therebetween, connected in a cohesion manner and sealed. The number of the dense graphite plates is more than one. The bipolar plate makes full use of the pressure resistance of the engineering plastic plate and the electric conduction property of the dense graphite plates, overcomes the disadvantage that the graphite is fragile and crisp, avoids the internal and external leakage of electrolytes and realizes the engineering enlargement of the bipolar plates for the flow batteries.