Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Manabu Miyaki

Yoshihiko Onishi

Kazuhisa Kurita

Kenji Nakao

Tsuyoshi Munezane

Takuya Uryu

Naoya Hashii

Keishi Nakano

Atsushi Yoshimura

Yuta Ichinose

Shinya Nose

Takuya Urya

A fuel injection valve has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat. The injection hole plate is formed at its central portion with a convex portion which is substantially axisymmetric with respect to a valve seat axis and which has a circular-arc shaped cross section, and the welded portion is also substantially axisymmetric with respect to the valve seat axis. Inlet portions of the injection holes are disposed in an injection hole arrangement surface diametrically outside of the convex portion and diametrically inside of a valve seat opening inner wall which is a minimum inside diameter of the valve seat, and the injection hole arrangement surface is coplanar with a surface having the welded portion.

Fuel injection valve

This invention serves to suppress the deterioration of oil tightness of a valve after welding without any change in the direction of fuel injection even with deformation of a convex portion after welding of an injection opening plate to a valve seat, as well as without any variation in the direction of fuel injection due to welding variation. In this invention, in a fuel injection valve which has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat, said injection hole plate is formed at its central portion with a convex portion which is substantially axisymmetric with respect to a valve seat axis and which has a circular-arc shaped cross section, and said welded portion is also substantially axisymmetric with respect to said valve seat axis. In addition, inlet portions of said injection holes are disposed in an injection hole arrangement surface diametrically outside of said convex portion and diametrically inside of a valve seat opening inner wall which is a minimum inside diameter of said valve seat, and said injection hole arrangement surface is coplanar with a surface having said welded portion.

The present invention attains downsizing of a permanent magnet with a simple structure to reduce a manufacturing cost thereof. Provided is a rotation angle detection device, including: a cylindrical magnetic circuit mounted to a shaft; and non-contact sensors provided in an inner void of the magnetic circuit, in which the magnetic circuit is composed of a first yoke and a second yoke formed of a magnetic material and having a pair of flat portions parallel and opposed to each other, and a pair of permanent magnets whose magnetic poles are aligned in the same direction so that magnetic fields whose magnetic fluxes are parallel to each other are generated in the void between the flat portions, and the non-contact sensor detects a rotation angle of the shaft by detecting a change in the direction of the magnetic fluxes.

Rotation angle detection device

A rotation angle detecting apparatus includes: a first permanent magnet; a second permanent magnet disposed so as to face the first permanent magnet, the second permanent magnet rotating together with a shaft; an arc-shaped first magnetic member and second magnetic member fixed to the first permanent magnet and the second permanent magnet; and a magnetic resistor disposed in an air gap formed between the first magnetic member and the second magnetic member so as to be axially aligned with the shaft, the first magnetic member and the second magnetic member each including: a projecting portion pointed at the magnetic resistor; and a wall portion surrounding the magnetic resistor so as to prevent influence from external magnetic fields.

Rotation angle detecting apparatus

Disclosed is an electromagnetic valve in which a force due to a working fluid from an inflow hole acting perpendicularly with respect to the axis of a shut-off valve is reduced to thereby reduce the sliding resistance of the shut-off valve. An electromagnetic valve according to the present invention includes: a housing () having an inflow hole (), an inner flow path (), and a discharge hole (); a valve seat () secured in position inside the housing (); a shut-off valve () adapted to abut one surface of the valve seat () to shut off the working fluid flowing into the inner flow path () through the inflow hole (); and a pressure regulating valve () provided coaxially with the shut-off valve () and adapted to control, through adjustment of the dimensions of a gap between itself and the other surface of the valve seat (), the amount of working fluid flowing to the exterior of the housing () through the discharge hole (). In the electromagnetic valve, the housing () is equipped with a whirling member for causing the working fluid having flowed into the inner flow path () through the inflow hole () to whirl in one direction.

Electromagnetic valve

A rotation angle detection device is simple in structure and is capable of reducing the size of a permanent magnet. The permanent magnet is fixedly secured to a rotating member. A first guide member is attached at one end face to an S pole side of the permanent magnet. A second guide member is attached at one end face to an N pole side of the permanent magnet, and has its tip end disposed in opposition to a tip end of the first guide member. A magnetoresistive member is disposed in a space between the tip ends of the first and second guide members, the magnetoresistive member being fixedly attached to a non-rotating member. An angle of rotation of the rotating member is detected by detecting a change of the azimuth of magnetic flux, which is generated by the permanent magnet in the space, by means of the magnetoresistive member.

In a non-contact type rotation-angle sensing device, a rotation angle sensor () having magnetoresistance elements detects a rotation angle of an object to be measured. The object is rotatable round a rotary shaft () with respect to the rotation angle sensor () and includes a permanent magnet (). The permanent magnet () is disposed symmetrically about said rotary shaft () of said object, and a magnetic element () is disposed on said object between said permanent magnet () and the magnetoresistance elements. In the non-contact type rotation-angle sensing device of above constitution according to the invention, linearity is secured by reducing magnetic hysteresis of the sensor output with respect to the rotation angle, thus a small-sized permanent magnet and reduction in cost being achieved.

Growing community of inventors

Tokyo, Japan

Manabu Miyaki