초록 ▼

A gas jacket is provided in a lower portion of a cylinder block, so that an exhaust gas in an exhaust gas passage is supplied to the gas jacket through an exhaust gas supply passage having an exhaust gas supply valve. Fresh air in an intake passage is supplied to an intake passage through a fresh-ai

A gas jacket is provided in a lower portion of a cylinder block, so that an exhaust gas in an exhaust gas passage is supplied to the gas jacket through an exhaust gas supply passage having an exhaust gas supply valve. Fresh air in an intake passage is supplied to an intake passage through a fresh-air supply passage having a fresh-air supply valve. The temperature of a lower cylinder wall is controlled in a feedback manner to a target temperature for the lower cylinder wall. The target temperature for the lower cylinder wall is set at a sufficiently high temperature in a range in which an oil film of lubricating oil, extending from an intermediate portion of the cylinder wall to a bottom dead center of a piston, can be ensured. Therefore, the viscosity of the lubricating oil can be decreased to minimize the friction loss at slide portions of the cylinder wall and the piston, thereby providing an increase in engine output, a reduction in amount of fuel consumed and a reduction in lubricating oil consumed.

대표청구항 ▼

A gas jacket is provided in a lower portion of a cylinder block, so that an exhaust gas in an exhaust gas passage is supplied to the gas jacket through an exhaust gas supply passage having an exhaust gas supply valve. Fresh air in an intake passage is supplied to an intake passage through a fresh-ai

A gas jacket is provided in a lower portion of a cylinder block, so that an exhaust gas in an exhaust gas passage is supplied to the gas jacket through an exhaust gas supply passage having an exhaust gas supply valve. Fresh air in an intake passage is supplied to an intake passage through a fresh-air supply passage having a fresh-air supply valve. The temperature of a lower cylinder wall is controlled in a feedback manner to a target temperature for the lower cylinder wall. The target temperature for the lower cylinder wall is set at a sufficiently high temperature in a range in which an oil film of lubricating oil, extending from an intermediate portion of the cylinder wall to a bottom dead center of a piston, can be ensured. Therefore, the viscosity of the lubricating oil can be decreased to minimize the friction loss at slide portions of the cylinder wall and the piston, thereby providing an increase in engine output, a reduction in amount of fuel consumed and a reduction in lubricating oil consumed. im 1 further comprising a forwardly extending tow bar having a hitch for coupling the seeding machine to a tractor. 3. A seeding machine as defined by claim 2 wherein the left and right wing frame segments are folded forwardly from their working configuration to their transport configuration along side the tow bar. 4. A seeding machine as defined by claim 3 wherein the first ends of the pivot arms are pivotally coupled to the left and right wing frames by left and right rock shafts each having a bell crank, a linear motor extends between the frame and the bell crank for rotating the rock shaft relative to the wing frame and thereby pivoting the pivot arm. 5. A seeding machine as defined by claim 4 wherein the linear motor is a hydraulic cylinder. 6. A seeding machine as defined by claim 1 wherein the main frame front rank of planting units and the main frame rear rank of planting units are directly mounted to the main frame by parallel linkages so that the planting units can follow the contour of the ground independent of the main frame when the main frame is in its working configuration. 7. A seeding machine as defined by claim 6 wherein the front ranks of planting units are directly mounted to the left and right wing frames by parallel linkages so that the planting units can follow the contour of the ground independent of the left and right wing frames when the left and right wing frames are in their working configuration. 8. A seeding machine as defined by claim 7 wherein each planting unit is attached to the pivot arm by a parallel linkage that allows the planting unit to follow the ground independent of the pivot link when the pivot link is in its working position. 9. A seeding machine as defined by claim 3 wherein the left and right wing frames are pivotally coupled to the main frame about fore/aft extending pivots so that the left and right wing frames can better follow the contour of the ground relative to the main frame when the left and right wing frames are in their working position. 10. A seeding machine as defined by claim 9 wherein the main frame is provided with ground support wheels that are raised and lowered relative to the main frame, the ground support wheels defining the working configuration and the transport configuration of the main frame, when the ground support wheels are lowered the main frame is raised into its transport configuration, when the ground support wheels are raised the main frame is lowered into its working configuration. 11. A seeding machine as defined by claim 10 wherein the left and right wing frames are each provided with a ground support wheel that are raised and lowered relative to the respective left and right wing frame, the ground support wheels defining the working configuration and the transport configuration of the left and right wing frames, when the ground support wheels are lowered the left and right wing frames are supported on the ground in their working configuration, when the ground support wheels are raised the left and right wing frames are forwardly folded into their transport configuration.