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Exhaust apparatus for transverse engine

Inactive Publication Date: 2011-06-02
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention has been made in view of the above background art. It is therefore an object of the present invention to, in an exhaust apparatus for a transverse engine, make it possible to compactly lay out an upstream exhaust assembly thereof including an exhaust gas-purifying unit, in an engine compartment without sacrificing a passenger compartment space, and quickly raise a temperature of a catalyst in the exhaust gas-purifying unit during engine warm-up.

Problems solved by technology

Moreover, in the arrangement where the exhaust gas-purifying unit is provided inside the tunnel portion, a traveling wind produced by traveling of a vehicle is more likely to touch the exhaust gas-purifying unit, so that it becomes difficult to quickly raise a temperature of a catalyst in the exhaust gas-purifying unit during engine warm-up.

Method used

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  • Exhaust apparatus for transverse engine
  • Exhaust apparatus for transverse engine
  • Exhaust apparatus for transverse engine

Examples

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first embodiment

[0025]FIGS. 1 and 2 show an exhaust apparatus E according to a first embodiment of the present invention. The exhaust apparatus E is designed for a transverse engine 1. The engine 1 is an inline four-cylinder engine having four cylinders 2 arranged in a line, and transversely placed in an engine compartment 19 at a front of a vehicle to allow a cylinder arrangement direction to be oriented in a vehicle-widthwise direction (rightward-leftward direction in FIG. 1). In the following description, a right side of the vehicle which corresponds to a right side in FIG. 1 (reverse side of the drawing sheet of FIG. 2), a left side of the vehicle which corresponds to a left side in FIG. 1 (obverse side of the drawing sheet of FIG. 2), a front side of the vehicle which corresponds to an upper side in FIG. 1 (left side in FIG. 2), and a rear side of the vehicle which corresponds to a lower side in FIG. 1 (right side in FIG. 2), will be referred to respectively as “vehicle-right side”, “vehicle-l...

second embodiment

[0057]FIGS. 6 to 8 show an exhaust apparatus E according to a second embodiment of the present invention, wherein a positional relationship between respective exhaust upstream ends of first and second intermediate collector pipe portions 33a, 33b (a merging position of first and fourth branch pipe portions 32a, 32d, and a merging position of second and third branch pipe portions 32b, 32c) is defined differently from that in the first embodiment.

[0058]Specifically, in the second embodiment, the exhaust upstream ends of the first and second intermediate collector pipe portions 33a, 33b are disposed at approximately the same position as that of a third fastening point 37c of a flange portion 36 in the vehicle-widthwise direction, and in offset relation to each other in an upward-downward direction. More specifically, the first branch pipe portion 32a and the fourth branch portion 32d are merged in the same manner as that in the first embodiment, whereas the second branch pipe portion 3...

third embodiment

[0063]FIGS. 9 to 11 show an exhaust apparatus E according to a third embodiment of the present invention, wherein a positional relationship between respective exhaust upstream ends of first and second intermediate collector pipe portions 33a, 33b (a merging position of first and fourth branch pipe portions 32a, 32d, and a merging position of second and third branch pipe portions 32b, 32c) is defined differently from those in the first and second embodiments.

[0064]Specifically, in the third embodiment, the exhaust upstream ends of the first and second intermediate collector pipe portions 33a, 33b are disposed at approximately the same position as that of a third fastening point 37c of a flange portion 36 in the vehicle-widthwise direction, as with the second embodiment. However, the exhaust upstream ends of the first and second intermediate collector pipe portions 33a, 33b are offset with respect to each other in the vehicle-longitudinal direction, instead of overlapping each other, ...

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Abstract

Disclosed is an exhaust apparatus (E) for a transverse engine (1) coupled with a transmission (11) located on one side thereof in a cylinder arrangement direction. The exhaust apparatus (E) has an upstream exhaust assembly (48) which comprises a plurality of branch pipe portions (32), a single exhaust pipe portion (34), and an exhaust gas-purifying unit (40). The exhaust gas-purifying unit (40) is disposed on a vehicle-rear side of the engine (1) to allow a gas passage thereinside to extend approximately in a vehicle-widthwise direction, in top plan view. The upstream exhaust assembly (48) includes, on an exhaust upstream side of the single exhaust pipe portion (34), a section which curves to allow an exhaust downstream region of the section to be oriented toward one side of the vehicle-widthwise direction which is a direction coming close to the transmission (11), in top plan view. The single exhaust pipe portion (34) curves to allow an exhaust downstream region of the single exhaust pipe portion (34) to be oriented toward a vehicle-front side, in top plan view. This makes it possible to compactly lay out the upstream exhaust assembly (48) in an engine compartment (19) without sacrificing a passenger compartment space, and quickly raise a temperature of a catalyst in the exhaust gas-purifying unit (40) during warm-up of the engine (1).

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention belongs to a technical field relating to an exhaust apparatus for a transverse engine which is transversely placed in an engine compartment at a front of a vehicle to allow a cylinder arrangement direction to be oriented in a widthwise direction of the vehicle (vehicle-widthwise direction).[0003]2. Description of the Background Art[0004]Heretofore, this type of transverse engine has been widely known. Typically, an exhaust apparatus for the transverse engine is disposed on a vehicle-rear side of the engine (see, for example, JP 2008-260472A; this document will hereinafter be referred to as “Patent Document 1”). The exhaust apparatus has a plurality of branch pipe portions each communicated with a respective one of a plurality of cylinders of the engine, wherein the branch pipe portions are merged to finally form a single exhaust pipe portion. Specifically, in the Patent Document 1, the entire cylin...

Claims

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Application Information

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IPC IPC(8): F01N3/08
CPCF01N3/10F01N13/08F01N2340/04F01N13/1816F01N13/1822F01N13/10B60K13/04B60K5/04Y02A50/20
Inventor USHIJIMA, KENJIHASEGAWA, HIROKAZUNAKATANI, YASUSHIKITABATAKE, KEISHIKUSUNOKI, YASUSHIKAMO, TOSHIAKINAKAMURA, YOSHITAKAWATANABE, DAISUKESHIMOJI, HIROKINEGAMI, MASAMI
Owner MAZDA MOTOR CORP
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