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A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive

A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has exceeded the motor speed.

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A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive

A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has exceeded the motor speed. utting head is enlarged with respect to a standard dome shape and a trailing portion of the cutting head is reduced with respect to a standard dome shape, said cutting head having an inner edge and an outer edge, wherein said exposed surface is non-symmetrical along a central plane which bisects the working portion and the trailing portion, and said exposed surface is symmetrical in a second plane perpendicular to the central plane such that the exposed surface forms an arc of constant radius from the inner edge to the outer edge in the second plane. 6. The percussion drill bit of claim 5, wherein said exposed surface is symmetrical in any intersecting plane which is perpendicular to the central plane such that the exposed surface forms an arc of constant radius in any such plane from the inner edge to the outer edge. 7. The percussion drill bit of claim 5, wherein said mounting portion and cutting head comprise a single tungsten carbide component. 8. The cutting insert of claim 5, wherein said exposed surface is non-symmetrica in any plane coextensive with the central axis and non-perpendicular to the central plane. 9. A cutting insert for a percussion drill bit, comprising: a generally cylindrical mounting portion extending along a central axis and a cutting head extending from the mounting portion, said cutting head having an exposed surface forming a non-symmetrical dome shape such that a working portion of the cutting head is enlarged with respect to a standard dome shape and a trailing portion of the cutting head is reduced with respect to a standard dome shape, said cutting head having an inner edge and an outer edge; wherein said exposed surface is non-symmetrical along a central plane which bisects the working portion and trailing portion, and said exposed surface is symmetrical in any plane perpendicular to the central plane such that the exposed surface forms an arc of constant radius from the inner edge to the outer edge in any such perpendicular plane. 10. The cutting insert of claim 9, wherein said mounting portion and cutting head comprise a single tungsten carbide component. 11. The cutting insert of claim 9, wherein said inner and outer edges are non-linear in side view orthogonal to the central axis. 12. The cutting insert of claim 9, wherein said inner and outer edges curve from a forward edge upwardly along the working portion and taper downwardly along the trailing portion to the rearward edge in said side view orthogonal to the central axis. 13. The percussion drill bit of claim 9, wherein said exposed surface is non-symmetrical in any plane coextensive with the central axis and non-perpendicular to the central plane. 14. A cutting insert for a gauge row of a percussion drill bit, comprising: a generally cylindrical mounting portion extending along a central axis and a cutting head extending from the mounting portion, said cutting head having an exposed surface forming a non-symmetrical dome shape such that a working portion of the cutting head is enlarged with respect to a standard dome shape and a trailing portion of the cutting head is reduced with respect to a standard dome shape, said cutting head having an inner edge and an outer edge; and wherein said exposed surface is non-symmetrical along a central plane which bisects the working portion and the trailing portion, and said exposed surface is symmetrical in a second plane perpendicular to the central plane such that the exposed surface forms an arc of constant radius from the inner edge to the outer edge in the second plane, wherein said inner and outer edges are non-linear in side view orthogonal to the central axis. 15. A cutting insert for a gauge row of a percussion drill bit, comprising: a generally cylindrical mounting portion extending along a central axis and a cutting head extending from the mounting portion, said cutting head having an exposed surface forming a non-symmetrical dome shape such that a working portion of t