Mazda Motor Corporation

Daikyonishikawa Corporation

Motoi Aoki

Toshikazu Kurokawa

Kouji Matsuura

Fusatoshi Tanaka

Kazumi Okamura

Makoto Shinhama

Hiroshi Mizuguchi

Yuta Mishima

Minoru Shitamori

Takashi Yamashita

Fusatosi Tanaka

Daisuke Ooune

Provided is a vehicle front structure capable of, without breaking a lid provided at a thermal insulating cover, reliably closing a bonnet and the lid even if an attempt is made to close the bonnet prior to closing the lid. In the present invention, a thermal insulating coverincluding a lidthat covers the upper side of an engine in an openable and closable manner is provided below a bonnetthat covers the upper side of an engine room in an openable and closable manner; the lidis provided with, in the vehicle front-rear direction, a hinge fulcrumon the same rear end side as a hinge fulcrumof the bonnetand is openable and closable independently of the bonnetand the lidincludes locking meansthat is locked to the bonnetwhen the lidis open and is released from the locking in conjunction with a closing operation of the bonnet

Vehicle front structure

A vehicle front structure includes, below a bonnet (), a cover member () that covers an engine from an upper portion thereof to the side and is formed by an upper wall (), a shroud () as a front wall, a rear wall (), and side walls () on the respective left and right sides. The cover member is formed by the upper wall, the front wall, the rear wall, and the side walls on the respective left and right sides. The front side of one of the left and right side walls is configured to have, relative to the rear side, a higher ratio of a low-rigidity member having lower rigidity than a high-rigidity member forming a main portion on the rear side.

An intake system for an engine allows supercharging using the dynamic effect of intake air has a surge tank for a cylinder group in which cylinders are ignited in a sequence discontinuous with each other, a second surge tank for another cylinder group in which cylinders are ignited in a sequence discontinuous with each other, a first upstream intake passage for supplying intake air to the first surge tank, a second upstream intake passage for supplying intake air to the second surge tank, a connecting tank for communicating intermediate portions of the individual intake passages with each other, and a short connecting passage for communicating upstream portions of the first upstream intake passage and the second upstream intake passage with the connecting tank 9. When the number of engine revolution is high, intake air is supplied to each of the cylinders through the connecting tank and the individual intake passage by taking advantage of the short connecting passage and bypassing a long upstream intake passage and the surge tank. Further, the short connecting passage does not adversely affect the effect to be produced by resonant supercharging because the upstream portion of the intake passage is communicated with the connecting tank. The intake system can shorten the length of passage for supplying intake air when the number of engine revolution is high due to inertia supercharging, without sacrificing the effect to be achieved by resonant supercharging.

Intake system for a combustion engine

Each surge tank disposed over the respective cylinder head of the combustion engine is connected to the intake port of each cylinder of the combustion engine individually and independently through the independent intake passages. The independent intake passages form a space, i.e. a dead space, in association with the surge tank and the cylinder head, and a first volume chamber or a second volume chamber is disposed within the space in order to provide the dynamic effect of intake air. The dynamic effect of intake air is achieved at least either of resonance supercharging or inertia supercharging.

Intake system for multi-cylinder engine

A fuel intake system for a combustion engine of a type having V-shaped first and second cylinder banks and also having a crank axis of the crankshaft, which comprises a throttle casing disposed in a center space delimited between the first and second cylinder banks, elongated first and second surge tanks extending in a direction parallel to the crank axis and disposed on respective sides of the center space, and a passage system communicating the throttle casing to each of the first and second surge tanks. The passage system comprises a merging region communicated with the throttle casing and first and second branch ducts branched off from one end of the merging region opposite to the throttle casing. The first and second branch ducts connect to the first and second surge tanks, respectively. Each of the first and second branch ducts is comprised of two independent passages spaced apart from each other in a direction parallel to the crank axis. These two independent passages of each of the first and second branch ducts are communicated with different portions of the associated surge tank which are uniformly spaced from each other in a direction parallel to the crank axis.

Growing community of inventors

Hiroshima, Japan

Motoi Aoki