Direct-injection type diesel engine
AssigneeKubota Corporation
InventorsYasunori Shiraishi, Masahiro Aketa, Wataru Iwanaga, Yuzo Umeda
Life of this patent
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Abstract
A direct-injection type diesel engine comprises a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto. The fuel injection nozzle (2) has a leading end opposed to a cylinder mid portion (4) and the glow plug (3) extends through an intake port wall portion (6) between the fuel injection nozzle (2) and an intake port (5). The glow plug (3) is inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and has a leading end inserted into the cylinder mid portion (4).
Claims8
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and an intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and having a leading end inserted into the cylinder mid portion (4),
- in order to use a swirl intake port for the intake port (5), the intake port wall portion (6) having an inner wall surface (8) near intake valve ports (10a), (10b), the inner wall surface (8) being inclined so that it approaches a cylinder center axis (7) as it comes closer to a cylinder (21) and running along the inclination of the glow plug (3), the inner wall surface (8) opposing to a wall surface (8a), which is made upright in a direction parallel with the cylinder center axis (7), the wall surfaces (8) and (8a) defining therebetween a wedge-like port portion (5a) which increases its width) toward the intake valve ports (10a), (10b).
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and an intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angel (θ1) and having a leading end inserted into the cylinder mid portion (4),
- the intake port (5) and an exhaust port (11) defining therebetween an inter-port transverse water passage (12), to which the intake port wall portion (6) with the glow plug (3) extending therethrough is opposed.
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and the intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and having a leading end inserted into the cylinder mid portion (4),
- the intake port (5) and an exhaust port (11) defining therebetween an inter-port transverse water passage (12), to which the intake port wall portion (6) with the glow plug (3) extending therethrough is opposed,
- cooling water passing through the inter-port transverse water passage (12) and being arranged to flow from an intake air distributing means (13) to an exhaust air converging means (14).
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and the intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and having a leading end inserted into the cylinder mid portion (4),
- the cylinder head (1) having a head cover (15) attached thereto, the head cover (15) having an outer wall (16) through which the glow plug (3) has an end portion extended, the glow plug (3) having a terminal projected out of the head cover (15),
- when seen in a direction parallel with a cylinder center axis (7), the head cover (15) having a ceiling provided with a breather chamber (20) which is deviated toward one side of a center axis (17) of a crank shaft, two valve ports (10a) and (10b) being provided for every intake port (5), in order to extend the glow plug (3) through the intake port wall portion (6) between the intake valve ports (10a) and (10b),
- when seen in a direction parallel with the cylinder center axis (7), the glow plug (3) being displaced in a direction opposite to the deviated direction of the breather chamber (20) by rotating an imaginary connecting line (18) which mutually connects respective center points of the two intake air valve ports (10a) and (10b), around the cylinder center axis (7) from a position where it perpendicularly crosses the center axis (17) of the crank shaft, by a predetermined angle (θ2).
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and the intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and having a leading end inserted into the cylinder mid portion (4),
- the cylinder head (1) having a head cover (15) attached thereto, the head cover (15) having an outer wall (16) through which the glow plug (3) has an end portion extended,
- in order for the glow plug (3) to have a terminal projected out of the head cover (15), an outer wall (16) of the head cover (15) having a portion which extends through an end portion of the glow plug (3), the portion being retreated toward the cylinder head (1), the glow plug (3) having a terminal (3a) arranged along with the retreat of the outer wall (16) within a space (15a) of a concaved portion which is formed in the head cover (15).
A direct-injection type diesel engine comprising a cylinder head (1) with a fuel injection nozzle (2) and a glow plug (3) attached thereto,
- the fuel injection nozzle (2) having a leading end opposed to a cylinder mid portion (4), the glow plug (3) extending through an intake port wall portion (6) between the fuel injection nozzle (2) and the intake port (5), and being inclined with respect to the fuel injection nozzle (2) by a predetermined angle (θ1) and having a leading end inserted into the cylinder mid portion (4), wherein
- in order to attach the glow plug (3) to the cylinder head (1) of a multi-cylinder engine, on the assumption that a longitudinal direction of the cylinder head (1) is taken as a front and rear direction and a width direction thereof is regarded as a left and right direction, the intake port (5) is formed along the left and right direction, and on the other hand, the glow plug (3) is inclined in the front and rear direction and has a terminal (3a) positioned at a mid portion in the left and right direction of the cylinder head (1) when seen in parallel with a cylinder center axis (7).
Dependencies are inferred from the claim text.