Denso Corporation

Yasuaki Matsunaga

Masatoshi Kuroyanagi

Mamoru Urushizaki

Shinobu Oikawa

Noriya Matsumoto

Koji Kondo

Masayuki Aoyama

Tomoyuki Hiramatsu

Naoyuki Akita

A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.

High-pressure pump

During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.

In an electronic-component mounting structure, an electronic component (,) has a surface. First electrodes (,) provided on the surface of the electronic component (,) are arranged in a first array. Second electrodes (,) provided on a base board (,) are arranged in a second array corresponding to the first array. The second electrodes (,) correspond to the first electrodes (,) respectively. Solder bumps (,) connect the first electrodes (,) and the second electrodes (,) respectively. The first electrodes (,) include first outermost electrodes (,) located in an outer area of the first array. The second electrodes (,) include second outermost electrodes (,) located in an outer area of the second array. The second outermost electrodes (,) correspond to the first outermost electrodes (,) respectively. An outer edge (X,, Z,) of each of the second outermost electrodes (,) extends outward of an outer edge (Y,) of a corresponding first outermost electrode (,) with respect to the first and second arrays. A distance between an outer edge (X,, Z,) of each of the second outermost electrodes (,) and an outer edge (Y,) of a corresponding first outermost electrode (,) is greater than a distance between an inner edge (X,, Z,) of the second outermost electrode (,) and an inner edge (Y,) of the corresponding first outermost electrode (,) with respect to the first and second arrays.

Electronic-component mounting structure

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Anjo, Japan

Yasuaki Matsunaga