摘要:
A tread surface includes a center arc, a shoulder-side arc, and a shoulder arc, and is formed such that a value given by F1=L1/(TDW×0.5) falls in the range of 0.64≦F1≦0.7, a value given by F2=TR1/OD falls in the range of 1.2≦F2≦2.0, a value given by F3=TR2/TR1 falls in the range of 0.1≦F3≦0.2, and a value given by F4=(β×TDW)/(100×SW) falls in the range of 0.35≦F4≦0.48, where L1 is outline range being a width from an equatorial plane to an edge of the center arc, TDW is extended tread width, TR1 is curvature radius of the center arc, TR2 is curvature radius of the shoulder-side arc, OD is tire outside diameter, SW is total width, and β is aspect ratio.
摘要:
To provide a pneumatic tire achieving improved wear resistance and improved handling performance while maintaining rollover resistance, a tread surface 11 is formed of a center arc 31, a shoulder-side arc 32, and a shoulder arc 33. The tread surface 11 is formed such that a value given by F1=L1/(TDW×0.5) falls in the range of 0.64≦F1≦0.7, a value given by F2=TR1/OD falls in the range of 1.2≦F2≦2.0, a value given by F3=TR2/TR1 falls in the range of 0.1≦F3≦0.2, and a value given by F4=(β×TDW)/(100×SW) falls in the range of 0.35≦F4≦0.48, where L1 is an outline range being a width from an equatorial plane 5 to an edge of the center arc 31, TDW is an extended tread width, TR1 is a curvature radius of the center arc 31, TR2 is a curvature radius of the shoulder-side arc 32, OD is a tire outside diameter, SW is a total width, and β is an aspect ratio.
摘要:
Through-holes 14 are formed in an armature core 11, and engaging portions 21 are formed in an commutator unit 15 at positions corresponding to the through-holes 14. Positioning pins 23 are inserted into the through-holes 14 and the engaging portion 21 to exactly position the armature core 11 to the commutator unit 15. The coil terminals are soldered to risers 18 in a state that the under side of the risers 18 are supported by the tips 35 of legs 36 standing erect on a support tool 34, inserted through the open slots 33.
摘要:
When winding an armature coil start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order, and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, it is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.
摘要:
Projections 30 of a commutator unit 23 formed on the radial line of slit center positions of commutator piece 26 arranged radially are inserted into through holes 22 made on the center axes of salient poles 19 arranged radially in an armature core 15 and a rotator with high position accuracy of center points with respect to the salient poles 19 is formed. A projection tip face 30c is positioned on a shaft 14 to accurate predetermined dimension A from the rear end of the shaft, whereby accuracy of play gap D can be improved. The commutator unit 23 is reinforced with the projections 30 and wrong form dimensions made due to heat deformation at the soldering treatment time can be prevented.
摘要:
A lens drive device may include a support body, a movable body having a lens, a magnetic drive mechanism having a coil mounted on the movable body and a magnet mounted on the support body for magnetically driving the movable body in a lens optical axis direction, two spring pieces which are connected between the movable body and the support body for supporting the movable body and which is used as a power supply member to the coil, and two binding pins which are provided in the movable body and around which coil ends of winding start and winding end of the coil are wound. Portions of the coil ends which are wound around the binding pins are electrically connected with the spring pieces.
摘要:
A DC motor with brushes includes a rotary shaft, an armature rotatable with the rotary shaft, a stator magnet disposed opposite to the armature, a commutator affixed on the side of the armature, and a pair of inside and outside brushes retained by a brush holder in a manner that the brushes are brought in contact with a peripheral surface of the commutator. The pair of brushes has an identical configuration. The outside brush is bent in a direction away from the other brush when the pair of the brushes is retained by the brush holder. The outside brush is further bend when in contact with the commutator. The inside brush has an end section extending toward an intermediate point of the outer brush in a longitudinal direction thereof. Each of the outside brush and the inside brush has a base section that is affixed to a terminal and an end section that is brought in contact with the commutator. The end section is bent with respect to the base section such that each of the outside brush and the inside brush defines a generally L-shape.
摘要:
A motor has a rotatably supported rotor shaft and a rotator that rotates together with the rotor shaft. The rotator includes a shaft insertion section that has an internal peripheral surface and a specified length in an axial direction in which the rotor shaft is inserted. The internal peripheral surface has a first internal peripheral surface of a small diameter and a second internal peripheral surface having a diameter slightly greater than that of the first internal peripheral surface. The first internal peripheral surface engages the rotor shaft under a pressure, and the second internal peripheral surface is slightly spaced a distance from the rotor shaft, such that a gap is created between the second internal peripheral surface and the rotor shaft. The rotor shaft is pressure-inserted in the first internal peripheral surface to be affixed to the rotator, and an adhesive is filled in the gap between the second internal peripheral surface and the rotor shaft to affix the second internal surface to the rotator.
摘要:
A disc chucking mechanism includes a turn table, on which a disc with a center hole is disposed, driven by a rotation/drive mechanism, said turn table having a cylindrical portion to which the center hole of a disc in fit, a first guide protruding radially outwardly of the outer circumferential surface of the cylindrical portion, second and third guides retractably provided at positions angularly spaced approximately 120° from the first guide with respect to the center of rotation of the cylindrical portion, and auxiliary guides provided at mid-positions between the second guide and the first guide and between the third guide and the first guide, a height of a peak point of each auxiliary guide being smaller than a height of a peak point of the first guide when measured from the outer circumferential surface of the cylindrical portion, wherein the distance of each auxiliary guide measured from the outer circumferenial surface of the cylindrical portion in smaller than the distance of the peak point of the first guide from the outer circumferential surface.
摘要:
An optical device may include a movable body holding a lens, a fixed body movably holding the movable body, a drive magnet and a drive coil for relatively moving the movable body with respect to the fixed body, and a metal member fixed to the drive magnet. The drive magnet is fixed to one of the movable body and the fixed body and the drive coil is fixed to the other of the movable body and the fixed body. A nickel plating layer containing at least nickel is formed on a surface of the drive magnet and a surface of the metal member, and the drive magnet and the metal member are joined to each other by a joining layer which is made of tin-based metal containing at least tin and is disposed between the drive magnet and the metal member.