Denso Corporation

Advics Co., Ltd.

Atsushi Yasuda

Isao Miyagawa

Katsuhiro Mita

Nobuyuki Nakashima

Kaoru Tsubouchi

Koji Suzuki

Yasunori Kawamoto

Hideaki Iijima

Shinji Tsuda

Makoto Hatano

Yuji Goto

Naoto Suzuki

Toshiharu Okuda

Mikio Muramatsu

A welding method heats and pressurizes a contacting portion, where a first member and a second member made of resin are in contact with each other, by a pressing tool. The welding method has forming a step, forming a recessed portion, crushing a protrusion, and filling the recessed portion. The step is defined between the first member and the second member by providing the protrusion to the first member. The recessed portion is provided in a tip of the pressing tool. The protrusion of the first member is crushed in the recessed portion by being pressed toward the second member using the pressing tool. The recessed portion is filled with the molten portion of the first member and the molten portion of the second member such that a rim of an outer periphery of the recessed portion is dug into the first member and the second member.

Welding method

A liquid level detector includes a casing having a first regulatory section and a second regulatory section, a float that has its upward and downward displacement restricted by contact with the first regulatory section or the second regulatory section, a magnet body that is held by the float, and a switch mechanism that is switched between an on-state and an off-state. A first distance from a switching plane to the first regulatory section and a second distance from the switching plane to the second regulatory section are both longer than a length from one magnet end face to a bottom end section.

Magnetic float liquid level detector with vertically reversible attachment

A liquid level detector includes a casing, a float, a magnet body, and a switch mechanism. The casing includes a tube section. The float is displaced upward or downward along a gravity direction. The magnet body is held by the float. The switch mechanism is accommodated in the tube section and is switched between an on-state and an off-state. The casing includes a first casing part and a second casing part. The first casing part includes the tube section, a first locking section that is formed radially outward of the tube section, and a first guide section that is formed at a tip of the tube section in an extending direction. The second casing part includes a second locking section and a second guide section.

Magnet float liquid level detector with guided locking case

A liquid level detection apparatus includes a rotation member axially supported by a fixed member. The rotation member includes the following. A contact portion press contacts an end surface making connection between both side surfaces of a magnet member. A pair of elastic deformation portions are protruded from the contact portion; each elastic deformation portion engages with a side surface of the magnet member in an elastically deformed state resulting from press to the magnet. A pair of pawl portions are protruded respectively from the elastic deformation portions while enabling the magnet member to be sandwiched between the contact portion and the pawl portions. A pair of plastic deformation portions are protruded from the elastic deformation portions, respectively; each of the plastic deformation portions engages with the side surface of the magnet member in a plastically deformed state resulting from the press to the magnet.

Liquid level detection apparatus

A liquid level detecting device includes a rotative member having a bearing portion and a stationary member having an axis portion. The axis portion is fitted to a hole of the bearing portion, thereby rotatably holding the rotative member. The rotative member is integrated with a displacement member. The stationary member is fixed with a detection unit to detect a displacement of the displacement member. The rotative member is connected with a float via an arm. The axis portion has an inserted portion inserted in the bearing portion and in contact with the bearing portion via a contact portion. The contact portion has a total area that is less than an area of an outer circumferential periphery of the inserted portion.

Liquid level detecting device

An electrical device includes a terminal connected with an electronic component, a pliant member which contacts a part of the terminal in a longitudinal direction of the terminal and covers a whole circumference of the part, and a casing for holding the electronic component and the terminal and the pliant member. The casing is molded by a resin material with the electronic component, the terminal and the pliant member being insert-molded. The end portion of the terminal of an opposite side to the electronic component extends to an outer side of the casing. One part of the pliant member is covered by the casing and the other part thereof is exposed to the outer side of the casing. The pliant member is compressed in a direction substantially orthogonal to the longitudinal direction of the terminal.

Electrical device and manufacture method for the same

A liquid level detecting device for detecting liquid level contained in a tank includes a float and an arm that moves in a prescribed manner when liquid level changes, a permanent magnet for forming a magnetic field, a hall IC for generating an electric signal in response to the motion of the magnetic field, a rotary member linked with the arm and the permanent magnet for moving the magnetic field relative to the hall IC as the float and the arm move, a terminal member for connecting the hall IC to an outside control circuit; and a mold body including a resinous holder for holding the hall IC and the terminal member. The resinous holder includes a sheath for insulating the hall IC from heat and mechanical stress generated when the mold body is formed.

Liquid level detecting device and method of manufacturing same

A fuel level gauge is advantageously used in a fuel tank of an automobile. The fuel level gauge installed in a fuel tank includes a float floating on the fuel surface, a rotatable member supported by a stationary member and a detector such as a Hall element. The float is connected to the rotatable member through an arm member, and the rotatable member rotates according to positions of the float. Rotational positions of the rotatable member are detected by the detector. The arm member is electrically connected through a conducting member to a ground terminal to ground electrostatic charges that are generated by abrasion between the float and the fuel and accumulated in the arm member. The conducting member slidably connects the arm member to the ground member not to disturb smooth rotation of the rotatable member. Accuracy of the fuel level detection is maintained by grounding the electrostatic charges.

Fuel level gauge for use in automobile

A guide pipe is formed from a metal material, and its internal cross section has a circular shape whose diametric dimension gradually becomes smaller with a distance from an ultrasonic sensor. That is, the guide pipe is formed so that a route for transmitting an ultrasonic wave generated from the ultrasonic sensor may be tapered from this ultrasonic sensor toward a reflector plate. Thus, the acoustic pressure level of the ultrasonic wave which enters the reflector plate can be made higher than a value in a prior-art liquid level detecting apparatus. Accordingly, the energy of the ultrasonic wave generated from the ultrasonic sensor can be utilized for liquid level detection at a high efficiency, so that a fuel liquid level detecting apparatus capable of accurate liquid level detection can be provided.

Liquid level detecting apparatus

A hydraulic brake apparatus includes a tandem brake master cylinder having a rod piston moving in response to a brake pedal, and a floating piston moving in response to the rod piston; a separation valve provided in a hydraulic brake circuit connecting the brake master cylinder and brake wheel cylinders in order to establish and shut off communication between the brake master cylinder and the brake wheel cylinders; a pressure control valve unit for controlling fluid pressure to be supplied from an external fluid-pressure supply source to the brake wheel cylinders while the separation valve is in a shutoff condition; and a stroke simulator mechanism for allowing an idle stroke of the rod piston and an idle stroke of the floating piston while the separation valve is in the shutoff condition. The idle stroke of the floating piston starts during the idle stroke of the rod piston.

Hydraulic brake apparatus

A master cylinder includes a primary piston and a secondary piston, each formed with piston ports which include two different kinds of ports, i.e. first ports for ensuring communication between a reservoir and a pressure chamber of the master cylinder, and second ports through which brake fluid is sucked from the reservoir during automatic break control. The second ports are greater in number than the first ports and are positioned forwardly of the first ports so that the second ports are closed by primary cups which are provided on the inner wall of the cylinder body so as to be in sliding contact with the respective pistons before the first ports when the respective pistons are advanced. An annular wall having a greater inner diameter than the outer diameter of the pistons is formed on the inner wall of the cylinder body to support the back of each of the primary cups. An annular groove is formed in each piston so as to communicate with the first ports. The annular groove is preferably arranged so as to radially oppose the annular wall when the piston is in an inoperative position.

Master cylinder

A hydraulic brake apparatus includes a brake master cylinder having a rod piston moving in response to a brake pedal; a separation valve provided in a hydraulic brake circuit in order to establish and shut off communication between the brake master cylinder and the brake wheel cylinders; a pressure control valve unit for controlling fluid pressure to be supplied from an external fluid-pressure supply source to the brake wheel cylinders while the separation valve is in a shutoff condition; and a stroke simulator mechanism for allowing an idle stroke of the rod piston so as to ensure a stroke of the brake pedal in accordance with an input load to the brake pedal. An orifice is provided in a passage which establishes, during the idle stroke of the rod piston, communication between a pressure chamber and an atmospheric pressure chamber which are defined within the brake master cylinder by means of the rod piston.

A hydraulic brake apparatus is provided with a master cylinder, an assisting device for assisting the master piston to be advanced in response to operation of a brake pedal, and an auxiliary piston having a large diameter portion and a small diameter portion to define first and second pressure transmitting chambers, with the large diameter portion connected to the assisting device. A first valve member is provided for controlling the communication between the first and second pressure transmitting chambers, and a second valve member is provided for controlling a flow of the brake fluid from the first chamber to the second chamber. A valve opening mechanism is provided for opening the first valve member, and mechanically connecting the second valve member with the first valve member, to open the second valve member when the auxiliary piston is retracted from its advanced state to its initial position.

Hydraulic brake apparatus for a vehicle

Disclosed is a master cylinder wherein a seal member is given plural seal functions to reduce the number of seal members for partitioning a drain portion of the master cylinder, a constant-pressure chamber of a booster and the atmosphere from one another, so that the master cylinder is simplified in construction and reduced in manufacturing cost. When a piston is operated by an output shaft of the booster attached to a booster mounting surface of a cylinder body, the operating fluid from the fluid pressure chamber partitioned by a fluid-tight seal member is supplied to a brake system. An annular complex seal member is fit in an internal seal stepped portion which is formed by radially expanding an opening portion of the cylinder which opens to a booster mounting surface. A slide seal portion of the complex seal member partitions a drain portion behind the fluid-tight seal member from the constant-pressure chamber of the booster through sliding contact with the piston. An air-tight seal portion of the complex seal member partitions the constant-pressure chamber from the atmosphere through abutting engagement with the front end surface of the booster. Further, a fixed seal portion of the complex seal member partitions the drain portion from the atmosphere through abutting engagement with the internal surface of an internal seal stepped portion.

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Kariya, Japan

Atsushi Yasuda