US-12618388-B2 - Engine device

US12618388B2US 12618388 B2US12618388 B2US 12618388B2US-12618388-B2

Abstract

An engine includes a common rail attached to one side portion of a cylinder block that pivotally supports a crankshaft in a rotatable mariner, the one side portion extending along a crankshaft center, and the common rail being configured to supply a fuel to the engine. A flywheel housing that accommodates a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion. One end portion of the common rail is disposed above the flywheel housing.

Inventors

Hiroaki NAGANAWA

Assignees

YANMAR POWER TECHNOLOGY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20200630
Priority Date: 20160408

Claims (12)

1 . An engine device comprising: a common rail attached to one lateral side portion of a cylinder block, the common rail being configured to supply fuel to an engine; a flywheel housing accommodating a flywheel and disposed in the cylinder block; and at least a portion of the common rail disposed above the flywheel housing.
2 . The engine device according to claim 1 , wherein the one lateral side portion extending along a crankshaft center; and a flywheel housing is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion.
3 . The engine device according to claim 1 , wherein a connector of the common rail electrically connected to an engine controller is disposed below an intake manifold that is provided to a cylinder head mounted on the cylinder block.
4 . The engine device according to claim 1 , wherein the intake manifold is formed integrally with the cylinder head.
5 . The engine device according to claim 1 , wherein the one lateral side portion of the cylinder block has a concavo-convex surface portion that corresponds to a shape of a coolant passage provided inside the cylinder block, and a connection port of the connector is directed toward a concave region of the concavo-convex surface portion in a side view.
6 . The engine device according to claim 1 , wherein an exhaust-gas recirculation device is coupled to the intake manifold, the exhaust-gas recirculation device being configured to mix part of an exhaust gas discharged from an exhaust manifold with fresh air, and a fuel injection pipe extending from the common rail toward the cylinder head passes through a space between the cylinder head and the exhaust-gas recirculation device.
7 . The engine device according to claim 6 , wherein a fuel feed pump that is attached to the cylinder block is disposed below the exhaust-gas recirculation device, the fuel feed pump being configured to supply a fuel to the common rail.
8 . The engine device according to claim 7 , wherein the fuel feed pump is attached to a housing bracket portion that protrudes from the one lateral side portion of the cylinder block, and a reinforcing rib that couples the one lateral side portion to the housing bracket portion is disposed below the fuel feed pump.
9 . The engine device according to claim 1 , wherein, the common rail has, in the one end portion, a pipe joint member for returning a surplus fuel, and in a cylinder head mounted on the cylinder block, a surplus fuel outlet for a surplus fuel from a fuel injection device is provided near an intersection between the one lateral side portion and the one side portion of the cylinder block in plan view.
10 . An engine device comprising: a common rail attached to one lateral side portion of a cylinder block, the common rail being configured to supply fuel to an engine; a flywheel housing accommodating a flywheel and disposed in the cylinder block; and at least a portion of the common rail disposed above the flywheel housing, wherein a coolant-circulating coolant pump is disposed in another side portion out of the opposite side portions of the cylinder block intersecting the one lateral side portion, and a coolant passage that connects a coolant passage inlet to a coolant passage outlet is provided in the cylinder block, and a coolant inlet member having a coolant inlet is detachably attached to the coolant passage inlet, the coolant passage inlet being opened in the one lateral side portion or the other lateral side portion intersecting the other side portion of the cylinder block, the coolant passage outlet being opened in the other side portion and being connected with a pump suction port of the coolant pump.
11 . The engine device according to claim 10 , wherein a rotational force of the crankshaft is transmitted to a pump shaft of the coolant pump through an endless band, and a pump suction port connecting portion, a boss portion for a pump-attaching bolt, and a rib portion are provided in the other side portion, the pump suction port connecting portion protruding and having an end surface in which the coolant passage outlet is formed, the boss portion protruding at a position apart from the pump suction port connecting portion, the position being on a side against a load direction of a load that is applied to the pump shaft due to a tension of the endless band, the rib portion coupling the pump suction port connecting portion to the boss portion and protruding with such a protruding height that the rib portion is not in contact with the coolant pump.
12 . The engine device according to claim 10 , wherein a plurality of bolt hole groups are provided around the coolant passage inlet, the plurality of bolt hole groups enabling the coolant inlet member to be attached at a plurality of attachment positions.

Description

CROSS-REFERENCE This is a continuation of U.S. patent application Ser. No. 16/091,880 filed on Oct. 5, 2018, which is a national stage entry of PCT/JP2017/014398 filed on Apr. 6, 2017, which claims priority to Japanese Patent Application Nos. JP2016-078468, and JP2016-078469, both filed on Apr. 8, 2016. All of the documents cited above are incorporated by reference in their entirety. TECHNICAL FIELD The present invention relates to an engine device, and particularly to an engine device including a common rail that is attached to one side portion of a cylinder block along a crankshaft center thereof, the cylinder block pivotally supporting a crankshaft in a freely rotatable manner. BACKGROUND ART Recently, use of a common rail in a diesel engine is prevailing because of, for example, an increase in injection pressure due to an increased demand for a lowered fuel consumption (see, for example, Patent Literature 1 (PTL 1)). The common rail, which is often attached to a cylinder block, stores a fuel supplied from a fuel tank under a high pressure. CITATION LIST Patent Literature PTL 1: Japanese Patent Application Laid-Open No. 2008-297989 SUMMARY OF INVENTION Technical Problem A conventional technique involves a problem that disposing a common rail on one side of a cylinder block limits a space for attaching a member other than the common rail. There has been a demand that an area occupied by a region where the common rail is disposed on one side of the cylinder block be reduced. In view of the problems described above, an object of the present invention is to reduce an area occupied by a region where a common rail is disposed on one side of the cylinder block. Solution to Problem An engine device according to an aspect of the present invention includes a common rail attached to one lateral side portion of a cylinder block that pivotally supports a crankshaft in a rotatable manner, the one lateral side portion extending along a crankshaft center, the common rail being configured to supply a fuel to an engine, wherein: a flywheel housing is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one lateral side portion, the flywheel housing accommodating a flywheel that is rotated integrally with the crankshaft and one end portion of the common rail is disposed above the flywheel housing. The engine device according to the aspect of the present invention may be configured, for example, such that a connector of the common rail electrically connected to an engine controller is disposed below an intake manifold that is provided to a cylinder head mounted on the cylinder block. It may be possible that, for example, the intake manifold is formed integrally with the cylinder head. Here, the intake manifold may be formed separately from the cylinder head and may be configured to be coupled to the cylinder head. It may be possible that: the one lateral side portion of the cylinder block has a concavo-convex surface portion that corresponds to a shape of a coolant passage provided inside the cylinder block, and a connection port of the connector is directed toward a concave region of the concavo-convex surface portion in a side view. The engine device according to the aspect of the present invention may be configured, for example, such that: an exhaust-gas recirculation device is coupled to the intake manifold, the exhaust-gas recirculation device being configured to mix part of an exhaust gas discharged from an exhaust manifold with fresh air; and a fuel injection pipe extending from the common rail toward the cylinder head passes through a space between the cylinder head and the exhaust-gas recirculation device. It may be possible that a fuel feed pump that is attached to the cylinder block is disposed below the exhaust-gas recirculation device, the fuel feed pump being configured to supply a fuel to the common rail. It may be possible that: the fuel feed pump is attached to a housing bracket portion that protrudes from the one lateral side portion of the cylinder block; and a reinforcing rib that couples the one lateral side portion to the housing bracket portion is disposed below the fuel feed pump. The engine device according to the aspect of the present invention may be configured, for example, such that: the common rail has, in the one end portion, a pipe joint member for returning a surplus fuel; and in a cylinder head mounted on the cylinder block, a surplus fuel outlet for a surplus fuel from a fuel injection device is provided near an intersection between the one lateral side portion and the one side portion of the cylinder block in a plan view. The engine device according to the aspect of the present invention may be configured, for example, such that: a coolant-circulating coolant pump is disposed in the other side portion out of the opposite side portions of the cylinder block intersecting the one lateral side portion; and a coolant passage that connects a coolant