JP3484327B2 - Heat insulation structure of hybrid electric vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid electric vehicle, and more particularly, to a heat shielding structure for blocking hot air from an engine to a generator or the like. 2. Description of the Related Art Conventionally, there is a hybrid electric vehicle in which an engine and an electric motor are combined to improve exhaust emission. [0003] Such a hybrid electric vehicle includes a generator driven by an engine, and a battery for storing the generated power, and travels by using these as a power source to drive an electric motor. However, in such a hybrid electric vehicle, the capacity of the generator is large, and the generator is directly connected to the engine and driven. [0005] For this reason, the temperature of the generator is likely to rise due to exposure to hot air around the engine, and there is a concern that the power generation performance of the generator may be reduced. Further, it is not preferable that the inverter for controlling the driving of the electric motor is affected by the hot air around the engine. Japanese Patent Application Laid-Open No. 8-284680 discloses a device for preventing hot air passing between an engine and an alternator from blowing against an engine mount.
In JP-A-77494, an exhaust manifold is arranged in a passage for guiding cooling air. An object of the present invention is to solve such a problem of the hybrid electric vehicle. A first aspect of the present invention provides an engine, a generator driven by the engine, a battery,
In a hybrid electric vehicle including a vehicle driving motor driven by an inverter using these generators and batteries as power sources, a power room is provided at a rear portion of the vehicle,
The power room is constructed hierarchically, with the engine and generator at the bottom, the inverter at the top, and the battery at the top, and the heat insulation that separates the generator, inverter, and battery from the engine. a plate provided, the heat shield plate is provided over the rear part from the front portion of the power chamber to the top of the power chamber, the heat shield plate at the junction of engine and generator,
A notch is formed in a substantially semicircular shape so as not to hit the connecting portion due to displacement of the engine, and a seal body made of an elastic member such as rubber is attached to the substantially semicircular peripheral portion so as to seal a gap with the connecting portion. . According to the first aspect of the present invention, the generator is prevented from being exposed to hot air and radiant heat from the engine side, the temperature rise of the generator is reduced, and power generation is performed. High power generation performance of the machine is ensured. Further, hot air from the engine side, radiant heat to the inverter, the battery is that no being affected, inverter <br/> data, good performance of the battery is maintained. [0014] In addition, even if the engine is displaced by the vibration,
Hot air on the engine side is reliably prevented from entering the generator side through the gap between the heat shield plate and the joint between the engine and the generator. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a power room 1 provided at the rear of a vehicle such as a bus. Reference numeral 2 denotes an engine, 3 denotes a generator driven by the engine 2, and 4 denotes a battery for storing electric power generated by the generator 3. , 5 and 6 are running motors driven by a generator 3 and a battery 4 via an inverter 7. Partition walls are formed at the front (upper side), upper part, etc. of the power room 1, the left and right sides are provided on the outer wall panel 8 of the vehicle, and the rear side (rear side of the vehicle) is provided with a door for inspection and the like. Surrounded by the rear panel of the vehicle. The engine 2 is arranged horizontally on the left side of the power room 1 (left side of the vehicle) in the figure, and the generator 3 is directly connected to the engine 2. 9 is an air cleaner. The electric motors 5 and 6 are mounted on the transmission 10 at the right side of the power room 1 (right side of the vehicle), and the driving force is transmitted from the drive shaft and the differential to the driving wheels via the transmission 10. The inverter 7 is arranged in the inverter room 11 in the middle part of the power room 1 on the right side of the figure (right side of the vehicle), and the battery 4 is arranged in the battery room 12 above the inverter room 11. Generator 3, electric motors 5, 6 and inverter room 1
Auxiliary equipment such as an air compressor 13, an air conditioner unit 14, and a radiator unit are arranged between the control unit 1 and the control unit 1. Then, between the engine 2 and the generator 3,
A heat shield plate 15 is provided so that hot air around the engine 2 does not flow around the generator 3. The heat shield plate 15 is formed so as to separate the engine room 16 and the generator room 17 from the front part to the rear part of the power room 1 as shown in FIGS. 16, the inverter room 11, the battery room 1
2 also extends to the upper part of the power chamber 1 so as to be separated . The periphery of the joint 18 between the engine 2 and the generator 3 of the heat shield plate 15 is cut out in a substantially semicircular shape so that the joint 18 does not hit the heat shield plate 15 due to the displacement of the engine 2. A sealing member 1 made of an elastic member such as rubber so as to seal a gap between the substantially semicircular peripheral portion and the coupling portion 18.
9 is attached. The heat shield plate 15 is provided up to the level of the cylinder block of the engine 2 and does not have to extend to the lowermost portion. With such a configuration, the hot air around the engine 2 does not flow into the vicinity of the generator 3, and even if the engine 2 is displaced by vibration, the seal body 19 attached to the heat shield plate 15 allows the hot air to be displaced by vibration. , Heat shield plate 15 and engine 2,
Hot air on the engine 2 side is prevented from entering the generator 3 through a gap between the generator 3 and the joint 18. In addition, the generator 3 is not exposed to the radiant heat of the engine 2, and the hot air in the engine room 16 is discharged from the lower part of the engine room 16 to the outside of the vehicle. Therefore, it is possible to prevent the temperature of the generator 3 directly connected to the engine 2 from rising due to the hot wind and the radiant heat from the engine 2 side. Therefore, the high power generation of the generator 3 of the hybrid electric vehicle is prevented. Performance is maintained and engine efficiency is improved. Further, hot air around the engine 2 is prevented from flowing into the inverter 7 and the battery 4 side.
The inverter 7 and the battery 4 are not affected by the hot air and the radiant heat, and the good performance of the inverter 7 and the battery 4 is maintained.

[Brief description of the drawings] FIG. 1 is an arrangement configuration diagram showing an embodiment. FIG. 2 is a layout view of the heat shield plate as viewed from the rear of the vehicle. FIG. 3 is a layout view of the heat shield plate as viewed from above. FIG. 4 is a layout view of the heat shield plate as viewed from the side of the vehicle. [Explanation of symbols] 1 Power room 2 Engine 3 generator 4 Battery 5,6 electric motor 7 Inverter 11 Inverter room 12 Battery room 15 Heat shield 16 Engine room 17 Generator room 18 Joint 19 Seal body

Continuing on the front page (72) Inventor Yuji Kusara Nissan Diesel Kogyo Co., Ltd. (Ichibanchi, Ichigo-cho, Ageo-shi, Saitama) (72) Inventor Toshihiko Abe Nissan Diesel Kogyo Co., Ltd. (56) References JP-A-52-145909 (JP, A) JP-A 50-119112 (JP, U) JP-A 50-119113 (JP, U) JP-A 63-150020 (JP, U) Kaihei 3-111156 (JP, U) Japanese Utility Model Hei 1-166234 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 6/02-6/04 B60K 8/00 B60L 11/14 F02D 29/06 F02B 77/11 F01P 5/06

Claims (1)

(57) [Claim 1] An engine, a generator driven by the engine, a battery, and a vehicle driving device driven by an inverter using the generator and the battery as power sources. In a hybrid electric vehicle including an electric motor, a power room is provided at a rear portion of the vehicle, the power room is hierarchically configured, an engine and a generator are arranged at a lowermost portion, an inverter is arranged at an upper layer, and a battery is arranged at an upper layer, generator to the engine, an inverter, a heat shield plate provided to further隔成the battery, the heat shield plate is provided over the rear part from the front portion of the power chamber to the top of the power chamber, the binding of engine and generator The heat shield plate is cut out in a substantially semicircular shape so that it does not hit the joint due to engine displacement, and the substantially semicircular peripheral edge seals a gap with the joint. Heat insulating structure of a hybrid electric vehicle, characterized in that attaching the seal member made of an elastic material such as rubber so.