Abstract: A control device for controlling an engine includes main-chamber injecting means (1,3) that supplies a main chamber (8) with fuel; sub-chamber injecting means (2) that supplies a sub chamber (5) with fuel after the main chamber injecting means (1,3) supplies the fuel; estimating means (21) that estimates a degree of knocking serving as indices of an intensity of the knocking and an occurrence frequency of the knocking; and fuel controlling means (22) that carries out, when the degree (N) of the knocking is a first predetermined value (N1) or more, fuel control that reduces a sub-chamber fuel amount representing an amount of fuel supplied by the sub-chamber injecting means (2). By reducing the sub-chamber fuel amount in this manner, the occurrence of knocking can be suppressed, so that the combustion state of a divided-combustion-chamber engine can be enhanced.

Abstract: The bead portion of the tire has an inner bead provided inside the tire width direction of a carcass ply and an outer bead provided outside the tire width direction of the carcass ply. The inner bead and the outer bead have a bead core portion including a bead cord formed of a metal material, and a filler portion provided outside the tire radial direction of the bead core portion and formed of a resin material. The inner bead and the outer bead sandwich a carcass ply.

Abstract: The run flat tire includes a tread portion in contact with a road surface, a tire side portion continuous to the tread portion and positioned inside in the radial direction of the tread portion, and a carcass forming a tire skeleton. The run flat tire is provided with a side reinforcing rubber in tire side portion. A carcass reinforcing belt formed by covering a circumferential direction cord extending along tire circumferential direction with a rubber material and a sheet-like reinforcing layer formed of a resin material are provided in layers on an inner side of the tire radial direction of the tread portion.

Abstract: The bead portion of the tire has an inner bead provided inside the tire width direction of a carcass ply and an outer bead provided outside the tire width direction of the carcass ply. The inner bead and the outer bead have a bead core portion including a bead cord formed of a metal material, and a filler portion provided outside the tire radial direction of the bead core portion and formed of a resin material. The inner bead and the outer bead sandwich a carcass ply.

Abstract: A tire includes a ring-shaped tire skeleton member and a belt. The belt includes a resin-covered cord formed of a reinforcing cord covered with a covering resin. The resin-covered cord is wound in a helical shape in the tire circumference direction on the outer periphery of the tire skeleton member and is joined to the tire skeleton member. Portions of the resin-covered cord that are adjacent to one another in the tire axis direction are joined to one another. An end portion of the resin-covered cord is joined to a portion of the resin-covered cord that is adjacent to a tire axis direction inner side of the end portion, areas of cross sections in a tire diameter direction of the end portion decrease toward a tip of the resin-covered cord, and the reinforcing cord is exposed at a tapered surface of the end portion.

Abstract: A pneumatic tire 10 includes a pair of bead cores 12A, a carcass 18, a belt layer, and a reinforcing layer 30. The carcass 18 is formed spanning between the pair of bead cores 12A. The belt layer includes an annular resin main body 12B that is disposed at a tire diameter direction inner side of the carcass 18 and is formed of resin, and reinforcing cords 12A that extend in a tire circumference direction, are arrayed to be spaced apart in a tire width direction, and are embedded in the resin main body 12A. The reinforcing layer 30 is disposed at the tire diameter direction inner side of the belt layer, and includes fiber cords 32 that extend at an angle of at most ±45° relative to the tire width direction.

Abstract: A resin-covered cord including n number of individual cords, disposed so as to be mutually spaced apart from each other, a covering resin that covers the cords, and an adhesive resin that is disposed between the cords and the covering resin and that has a greater tensile elastic modulus than the covering resin. Equation (1) below is satisfied, in which A is a total value of a width direction dimension of a portion where the cords and the adhesive resin are disposed, and B is a maximum value of a thickness direction dimension.

Abstract: By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.

Abstract: Taking a groove side-wall to a position at ½ a groove depth from a tread face of lug groove as a tread-in side first inclined portion, and taking a groove side-wall from the position at ½ groove depth to a groove bottom as a tread-in side second inclined portion, then the following A1 is set less than the following B1.

Abstract: A pneumatic tire, having a plurality of sipes formed in land portions of a tread thereof so as to each extend in the tire width direction, characterized in that: in a cross section of the land portion orthogonal to the sipe extending direction, provided that an imaginary sipe main line links two ends in the tire radial direction of each sipe, at least two of the sipes are “inclined sipes” each having the sipe main line inclined with respect to the tire radial direction; each inclined sipe has inner bent portions each protruding with respect to the sipe main line with peaks positioned deeper than 20% of the sipe depth; and the sipe main line(s) of at least one of the inclined sipes are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line of any of the other inclined sipes.

Abstract: A pneumatic tire (10), which has, in the surface of the tread (11), lug grooves (15) on one side extending from one axial edge towards the axial center of the tire in such a manner as to intersect with the circumferential direction of the tire and lug grooves (15) on the other side extending in a symmetrically opposite direction from the axial center towards the other axial edge of the tire, has at least one circumferential groove (12) extending circumferentially around the tire. Also, circumferential grooves (12, 13a, 13b) are so formed as to satisfy a relationship of “1?(S/L)?3” where L is the axial length of the central region, which is the region enclosed by two straight parallel lines each passing through the center between the contact width center (CL) and the contact edge with the shoulder regions being the regions axially outside of the parallel lines, and S is the total of the groove areas of the circumferential grooves (12, 13a, 13b) disposed in the central region.

Abstract: Taking a groove side-wall to a position at ½ a groove depth from a tread face of lug groove as a tread-in side first inclined portion, and taking a groove side-wall from the position at ½ groove depth to a groove bottom as a tread-in side second inclined portion, then the following A1 is set less than the following B1.

Abstract: By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.

Abstract: A pneumatic tire (10) has, in the surface of the tread (11), a central circumferential groove (12) located at the center of the contact patch width and extending circumferentially around the tire, a plurality of longitudinal grooves (13 (13a, 13b)) formed on the axially outside of the central circumferential groove (12), lug grooves (15), and blocks (16 (16a to 16c)) defined by the central circumferential groove (12), the longitudinal grooves (13), and the lug grooves (15). Each of the lug grooves (15) is formed such that its width in the shoulder region is greater than its width in the central region, and the sum of the groove area of the central circumferential groove (12) and the groove area of the longitudinal grooves (13) is smaller than the area of the lug grooves (15).

Abstract: A pneumatic tire, comprising: a tread surface; a plurality of grooves formed in the tread surface, including a plurality of widthwise grooves each extending from a corresponding tread end on the inner side in the tread width direction and a plurality of circumferential grooves each extending in the tread circumferential direction to intersect the widthwise grooves; blocks demarcated by the plurality of grooves; and a chamfered portion formed at a corner, on the trailing edge side and on the outer side in the tread width direction, of each block.