Abstract: A lens barrel and an imaging device which can be miniaturized, the lens barrel with a movable cylinder that moves along the optical axis with a change in focal length; first and second drive units in the movable cylinder; and first and second lens driven by the first and second drive units respectively to move along the optical axis relative to the movable cylinder. The movement amount of the first lens relative to the cylinder when the focal length is changed to a second focal length from a first state where the first lens is at a position closest to a subject with a first focal length is less than the movement amount of the first lens relative to the cylinder when the focal length is changed to the second focal length from a second state where the first lens is closer to an image plane than the first state.

Abstract: A vehicle lower structure includes an internal combustion engine arranged in an engine compartment of a vehicle; a lower cover arranged below the internal combustion engine and formed so as to cover a lower portion of the engine compartment; and one or more baffle plates arranged between the internal combustion engine and the lower cover. The one or more baffle plates are located within a range of the width of the internal combustion engine in the engine compartment with respect to the front-rear direction of the vehicle. The one or more baffle plate protrude toward the lower cover from the side of the internal combustion engine or toward the internal combustion engine from the side of the lower cover with respect to the top-bottom direction of the vehicle. The one or more baffle plate are formed so as to extend to the left-right direction of the vehicle.

Abstract: A vehicle lower structure includes an internal combustion engine arranged in an engine compartment of a vehicle; a lower cover arranged below the internal combustion engine and formed so as to cover a lower portion of the engine compartment; and one or more baffle plates arranged between the internal combustion engine and the lower cover. The one or more baffle plates are located within a range of the width of the internal combustion engine in the engine compartment with respect to the front-rear direction of the vehicle. The one or more baffle plate protrude toward the lower cover from the side of the internal combustion engine or toward the internal combustion engine from the side of the lower cover with respect to the top-bottom direction of the vehicle. The one or more baffle plate are formed so as to extend to the left-right direction of the vehicle.

Abstract: An internal combustion engine wherein the top wall surface of the intake air inflow passage part of the intake port is formed by a first top wall surface and a second top wall surface lower than the first top wall surface and wherein a lower layer flow passage and an upper layer flow passage are formed at the height position of the second top wall surface as a boundary. When the intake valve opens, a lower layer flow flowing through the inside of the lower layer flow passage passes through the intake valve opening region, flows to the circumferential direction of the combustion chamber, and generates a swirl, while an upper layer flow flowing through the inside of the upper layer flow passage passes through the helical part and flows into the combustion chamber.

Abstract: An internal combustion engine wherein the top wall surface of the intake air inflow passage part of the intake port is formed by a first top wall surface and a second top wall surface lower than the first top wall surface and wherein a lower layer flow passage and an upper layer flow passage are formed at the height position of the second top wall surface as a boundary. When the intake valve opens, a lower layer flow flowing through the inside of the lower layer flow passage passes through the intake valve opening region, flows to the circumferential direction of the combustion chamber, and generates a swirl, while an upper layer flow flowing through the inside of the upper layer flow passage passes through the helical part and flows into the combustion chamber.