摘要:
A spark plug for an internal combustion engine capable of ensuring sufficient gastightness of a combustion chamber and meeting demand for a reduction in diameter.
摘要:
A spark plug having an insulator with improved breakage resistance. The spark plug has a cross-section that satisfies the following relationship: 0.6 mm
摘要:
The cavity of a plasma jet ignition plug is configured in a stepped shape; i.e., composed of a constricted portion and a diameter-increased portion (65). The inner diameter (B) of the constricted portion is made smaller than the inner diameter (A) of the diameter-increased portion. Further, as measured along the direction of the axis O, the length (Y) of the constricted portion is made equal to or greater than the length (X) of the diameter-increased portion. This configuration suppresses a pressure loss produced when the generated plasma expands within the cavity. As a result, the energy of the plasma at the time of jetting is increased, and the igniting performance for an air-fuel mixture can be improved.
摘要:
This endoscope device is provided with: a laser light source that emits light having a specific wavelength; a diffusion optical component that diffuses light emitted from the laser light source and irradiates it onto an endoscopic examination subject at a distal end portion of an insertion portion; an adaptor that has a fluorescent substance that uses light from the laser light source as excitation light to emit light having a different wavelength, and is mounted on the distal end portion of the insertion portion such that it is able to be freely attached or removed; and a diffusion prevention component that is placed between the fluorescent substance of the adaptor and the diffusion optical component, and that prevents diffusion of light irradiated from the diffusion optical component.
摘要:
An initial position determining method is described for a position calculating operation for satellite signals from a positioning satellite. Signals are received from a positioning satellite. A number of candidate ranges are set. An estimated reception frequency for a received signal is calculated. A range may be selected from the candidate ranges based at least in part on a difference between a measured reception frequency and the estimated reception frequency for each range. A representative position from the selected range may be selected as the initial position to be used for a position calculating operation.
摘要:
A gas sensor (1) including a protector (100) for protecting a detection portion (11) of a sensor element (10). The protector (100) has an inner protector (120) and an outer protector (110). A diameter r of an exhaust hole (160) formed in the inner protector (120) and an axial distance h between a front end 10a of the sensor element 10 and the exhaust hole (160) satisfy a relation r≦2h/15+⅓.
摘要:
A spark plug 1 includes an insulator 2, a metal shell 3, a center electrode 5 and a ground electrode 27. A spark discharge gap 33 is formed between a front end portion 28 of the center electrode 5 and the ground electrode 27. The metal shell 3 has a through hole 29 therein and a metal convex portion 21 inwardly radially projecting in the through hole 29. The metal convex portion 21 includes a convex rearward face 30, a convex inner circumferential face 31 and a convex forward face 32. The through hole 29 has an inner diameter A (mm) at a front end side inner circumferential face 40, which is located at the front end side with respect to the convex forward face 32. The insulator 2 is inserted in the through hole 29 and has a first insulator taper portion 14, a second insulator taper portion 36 and a base 37 between the taper portions. The present invention satisfies the following representations: G≦(A−B)/2; A≧7.3; and 2≦XX≦4, where “B” (mm) is an outer diameter of a border K between an insulator front end portion 38 and the second insulator taper portion 36, where “G” (mm) is a distance of a spark discharge gap 33, and where “XX” (mm) is a length from a very-end portion FF of the convex inner circumferential face 31 to the border K in the axial C1 direction.
摘要:
According to one embodiment, a storage device includes a target track write module and a test pattern read module. The target track write module performs a write operation on a target track, which is a predetermined track intersecting a test pattern, on a storage medium to which the test pattern is written. The test pattern intersects a plurality of tracks arranged at regular intervals and is continuously arranged over the tracks. The test pattern read module reads the test pattern overwritten by the target track write module.
摘要:
In a protector (100) for protecting a detecting portion (11) of a sensor element (10) of a gas sensor (1), the opening area of individual inner introduction holes (130) and (140) formed in an inner protector (120) is 3.5 mm2 or less. In this manner, the amount and size of water droplets able to pass through the inner introduction holes (130) and (140) and to adhere to the sensor element (10) is restricted. In order to ensure good gas replaceability between the interior and the exterior of the inner protector (120) so as to attain quick gas response, the total opening area of the inner introduction holes (130) and (140) is 10 mm2 or more.
摘要:
An ignition device for a plasma jet ignition plug is provided. A resistance for decreasing electric noises is not incorporated in a plasma jet ignition plug. A resistance of not less than 1 KΩ and not more than 20 KΩ is provided to a path from a spark discharge circuit to a center electrode, thus reducing the generation of electric noises at the time of trigger discharge. Along with the reduction of the generation of electric noises, a loss of energy at the time of plasma discharge can be reduced by setting an inner resistance provided to a line extending to the center electrode from a plasma discharge circuit to 1Ω or less. Accordingly, the plasma jet ignition plug can jet flame-shaped plasma sufficiently large for igniting an air-fuel mixture.