Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Atsushi Baba

Tsuneo Endoh

Masashi Shinohara

Masahiko Minemi

Taizou Kitamura

Tatsuya Nakagawa

Yasunari Kimura

Tsutomu Takahashi

Makoto Uda

Naoki Ohta

Shinichi Obara

A support apparatus for disassembling and assembling a gas turbine engine includes an exhaust nozzle attaching and detaching device for guiding movement of an exhaust nozzle in an axis direction and including: a first guide jig detachably fixed to a casing; and a first holding tool detachably supporting the nozzle and engaged with the first guide jig, thereby enabling attaching and detaching the nozzle easily and securely while leaving the engine in a horizontal attitude. The apparatus also includes a low-pressure turbine attaching and detaching device guiding movement of a low-pressure turbine in the axis direction and including: a second guide jig detachably fixed to the casing; and a second holding tool detachably supporting the turbine and engaged with the second guide jig, thereby enabling attaching and detaching the turbine easily and securely while leaving the engine in the horizontal attitude.

Support apparatus for disassembling and assembling gas turbine engine

A valve-operating mechanism for an internal combustion engine having intake and exhaust valves and valve control members for controlling the intake and exhaust valves. The intake and exhaust valves are configured as dual valves having an outer valve and an inner valve. The valve control members, at least during scavenging, simultaneously close the outer valves of the intake and exhaust valves, producing a non-overlapping state, and simultaneously open the inner valves of the intake and exhaust valves, producing an overlapping state.

Valve-operating mechanism for internal combustion engine

A heat exchange system is provided that includes an evaporator () that carries out heat exchange between exhaust gas discharged from an exhaust port (B) and water, exhaust gas passages () on the upstream side in the direction of flow of the exhaust gas being disposed on the radially inner side, an exhaust gas passage () on the downstream side being disposed on the radially outer side, and an oxygen concentration sensor cooling portion () for cooling a mounting section of an oxygen concentration sensor () facing the exhaust gas passage () on the most upstream side being positioned on the radially outer side of the exhaust gas passage (). Water is supplied separately to a water passage (W) of the evaporator () and a water passage (W) of the oxygen concentration sensor cooling portion (), and the water passage (W) of the evaporator () is arranged so that the direction of flow of the water is opposite to the direction of flow of the exhaust gas. It is thereby possible to improve the waste heat recovery efficiency of the evaporator () that carries out heat exchange between the exhaust gas of an internal combustion engine and water and, in particular, to minimize the escape of heat via the oxygen concentration sensor () for detecting the condition of the exhaust gas.

Heat exchange device

A cooling block forming a top wall of a combustion chamber of an internal combustion engine is formed by layering, from the outside to the inside, a casing, an upper layer block, a middle layer block, and a lower layer block. Labyrinth-shaped cooling water passages are formed on upper side faces of the three layers of blocks, and cooling water supplied from a cooling water supply passage flows from the cooling water passage on the side far from the combustion chamber to the cooling water passage on the side close to the combustion chamber, and is discharged from a cooling water discharge passage. Since the cooling water flows in a direction opposite to the direction of emission of heat of combustion from the combustion chamber, it is possible to ensure that there is sufficient difference in temperature between a cylinder head and the cooling water throughout the cooling water passages.

Internal combustion engine

An internal combustion engine is provided in which an exhaust port communicating with a combustion chamber formed in a cylinder head is formed from independent exhaust ports, which are positioned on the upstream side, and a grouped exhaust port, in which the plurality of independent exhaust ports are combined. Water supplied from a supply pump passes through a water passage of the grouped exhaust port and a water passage of the independent exhaust ports while cooling the exhaust port, and a valve seat and valve guide on the periphery of the exhaust port, which have high temperatures, thus heating the water itself and thereby recovering waste heat of the internal combustion engine. The heated water carries out heat exchange with exhaust gas in an evaporator provided in an exhaust passage and turns into high temperature, high pressure steam, which drives an expander of a Rankine cycle system. It is thereby possible to maximize the recovery of heat transferred from the exhaust port to the cylinder head of the internal combustion engine.

A heat exchange system is provided in which low temperature water from a supply pump () is split and supplied to an auxiliary evaporator () provided so as to cover an exhaust port () extending from a combustion chamber of an internal combustion chamber (E) and to a main evaporator () provided downstream of the exhaust port (). The direction of water flowing through the auxiliary evaporator () is parallel to the direction of flow of exhaust gas, and as a result an upstream section of the exhaust port (), which has a high temperature, can be cooled effectively with low temperature water, and the escape of heat from the upstream section of the exhaust port () can be suppressed. The direction of water flowing through the main evaporator () is opposite to the direction of flow of exhaust gas, thus ensuring that there is a temperature difference between the water and the exhaust gas along the whole length of the water passage of the main evaporator () and enabling the heat exchange efficiency to be improved.

Heat exchange system

A waste heat recovering device for an internal combustion engine includes: an internal combustion engine; and an evaporator into which an exhaust gas of the internal combustion engine is introduced as a high temperature fluid. An exhaust gas inlet of the evaporator is placed adjacent to an exhaust valve of the internal combustion engine. Thus, there can be provided a waste heat recovering device having a high waste heat recovery rate.

Waste heat recovery device for internal combustion engine

An evaporator () is provided that carries out heat exchange between exhaust gas discharged from an exhaust port (B) of an internal combustion engine and water, the evaporator () including a large number of heat transfer plates () stacked at predetermined intervals from each other in a direction perpendicular to the plane of the paper and a large number of pipe members () running through the heat transfer plates () and being connected in a zigzag shape at opposite ends, and exhaust gas passages () being defined between the heat transfer plates () by a partition wall () formed by making projections formed on the heat transfer plates () abut against each other. While passing through the exhaust gas passages (), the exhaust gas discharged from the exhaust port (B) carries out heat exchange with water flowing through the pipe members (), and the water that has received the thermal energy of the exhaust gas turns into high temperature, high pressure steam. It is thus possible to maximize the heat transfer area of the evaporator () and thereby improve the heat exchange efficiency.

Heat exchanger

In an internal combustion engine, a combustion chamber is provided in a cylinder head on one side of a partition wall, and a heat-insulating layer is provided in the cylinder head on the other side of the partition wall. Cooling passages are provided in a plurality of regions provided with different heat loads in the partition wall, respectively. The flow rate of a cooling medium is set, so that the flow rate in the cooling passage existing in the region of the larger heat load is larger than that in the cooling passage existing in the region of the smaller heat load. Thus, the temperature of an exhaust gas can be maintained at a high level by maintaining the combustion chamber at a high temperature.

In an exhaust port structure in an internal combustion engine, a cylinder head has a cylinder head body and a cylindrical exhaust port liner. The exhaust port liner is partially supported at a plurality of points on the cylinder head body, and a heat-insulating layer exists around the exhaust port liner. Thus, it is possible to inhibit the propagation of heat from the exhaust port liner to the cylinder head body as much as possible.

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Wako, Japan

Atsushi Baba