Abstract: The engine with a variable flow rate oil pump includes a subsidiary relief passage that extends from an oil passage-switching valve to a subsidiary oil pump, a main relief passage that extends from the oil passage-switching valve to the main oil pump separately from the subsidiary relief passage, and a check valve that is provided in the subsidiary discharge passage and cuts off the flow of oil from the main discharge passage side to the oil passage-switching valve side. The oil passage-switching valve has a main pressure-adjusting chamber for the main oil pump, a subsidiary pressure-adjusting chamber of for the subsidiary oil pump, and a spool valve that performs partitioning between the main pressure-adjusting chamber and the subsidiary pressure-adjusting chamber.

Abstract: An exhaust system for a variable cylinder engine for assuring purification of exhaust gas without increasing the number of catalysts and an intake system for purifying blow-by gas. The exhaust system includes an activation side exhaust pipe connected to an activation cylinder group that operates normally. A deactivation side exhaust pipe is connected to a deactivation cylinder group wherein fuel supply is stopped under a particular condition. A gathering section is connected to downstream ends of the activation side exhaust pipe and the deactivation side exhaust pipe with a sub-catalyst disposed in the activation side exhaust pipe and a main catalyst disposed at the gathering section. The main catalyst is formed wherein gas passing therethrough is partitioned into flows independent of each other in a flow path direction. The activation side exhaust pipe and the deactivation side exhaust pipe are connected in a mutually independent state to the main catalyst.

Abstract: In an engine having an oil pump wherein an oil filter is incorporated into the oil pump without allowing the oil pump to become large in size. An oil pump and a hydraulic line changeover valve including a spool valve are disposed so as to have axes extending in parallel with each other. The oil pump has a plate-shaped oil filter disposed at a discharge port thereof. The plate-shaped oil filter is curved arcuately along an outer periphery of a pump rotor as viewed from a pump axial direction.

Abstract: The engine with a variable flow rate oil pump includes a subsidiary relief passage that extends from an oil passage-switching valve to a subsidiary oil pump, a main relief passage that extends from the oil passage-switching valve to the main oil pump separately from the subsidiary relief passage, and a check valve that is provided in the subsidiary discharge passage and cuts off the flow of oil from the main discharge passage side to the oil passage-switching valve side. The oil passage-switching valve has a main pressure-adjusting chamber for the main oil pump, a subsidiary pressure-adjusting chamber of for the subsidiary oil pump, and a spool valve that performs partitioning between the main pressure-adjusting chamber and the subsidiary pressure-adjusting chamber.

Abstract: An exhaust system for a variable cylinder engine for assuring purification of exhaust gas without increasing the number of catalysts and an intake system for purifying blow-by gas. The exhaust system includes an activation side exhaust pipe connected to an activation cylinder group that operates normally. A deactivation side exhaust pipe is connected to a deactivation cylinder group wherein fuel supply is stopped under a particular condition. A gathering section is connected to downstream ends of the activation side exhaust pipe and the deactivation side exhaust pipe with a sub-catalyst disposed in the activation side exhaust pipe and a main catalyst disposed at the gathering section. The main catalyst is formed wherein gas passing therethrough is partitioned into flows independent of each other in a flow path direction. The activation side exhaust pipe and the deactivation side exhaust pipe are connected in a mutually independent state to the main catalyst.

Abstract: In an engine having an oil pump wherein an oil filter is incorporated into the oil pump without allowing the oil pump to become large in size. An oil pump and a hydraulic line changeover valve including a spool valve are disposed so as to have axes extending in parallel with each other. The oil pump has a plate-shaped oil filter disposed at a discharge port thereof. The plate-shaped oil filter is curved arcuately along an outer periphery of a pump rotor as viewed from a pump axial direction.