摘要:
This invention has provided a manufacturing method of semi-finished piston with inner cooling channel through liquid extrusion process, including the following steps: a) produce a wear-resistant cast iron ring with coupling hooks and a common salt and corundum dissoluble core with convex edges; b) fix the wear-resistant cast iron ring in the casting moulds after being aluminized; c) fix the dissoluble core after being pre-heated on the wear-resistant cast iron ring with coupling hooks and convex edges; d) fill in the casting mould with aluminum alloy liquid, compressing and molding. The dissoluble core can be accurately fixed in the casting mould through coupling hooks and convex edges. When the semi-finished piston has been manufactured into finished product, it shall be characterized by high compactness and high mechanical property resulted from liquid extrusion technology. Meanwhile, because of the cooling channel, the temperature in the combustion chamber of the head and ring groove is reduced, the load capacity of the piston is greatly improved, and the manufacturability becomes better.
摘要:
The present invention has provided a welding forged steel single piece piston and its manufacturing methods. A semi-finished head and a semi-finished skirt are forged respectively; the semi-finished head and semi-finished skirt are heat-treated respectively; rough machining is carried out respectively to the semi-finished head and the semi-finished skirt, and a face of weld between the two adjacent ring grooves is higher than the one under the combustion chamber; the head and the skirt are welded together through friction welding; an annular groove, a combustion chamber, a ring groove, a pinhole, an outer annulus and oil inlet/outlet holes are manufactured respectively; and the surface of the piston is phosphorized and graphitized. Compared with one-piece forged piston, it has better processing technology, because the head and skirt are forged respectively and then welded together. Over-all structural rigidity of the piston has been increased, and distortion of the ring groove in high temperature is slight because the cooling oil recess is sealed through welding. As the annular groove is located on the upper part of skirt, the weight of body of the piston is lowered and this kind of structure can accelerate engine oil returning on, decrease the clearance between the piston and the cylinder and reduce the engine oil consumption.
摘要:
An electrical card connector (100) for compatibly electrically connecting with a number of electronic cards (5), includes an insulator (1) defining a number of recesses (111, 112, 113, 114) for insertion of the electronic cards, a number of contacts (2) assembled to the insulator (1) and a protective device (3) provided with a pair of resilient arms (312). Each resilient arm is formed with a hook (3121) engageable with the insulator. The protective device slides to expose the contacts when a suitable card is inserted.
摘要:
An electrical connector (1) has an insulative housing (10) having a D-shaped mating portion (11), a number of first and second contacts (21, 22) received in the housing, and a metal shell (50) surrounds the mating portion of the housing. An inner printed circuit board (30) is assembled to the housing and connects the first and second contacts. The first and second contacts are electrical connecting with a complementary connector and an outer printed circuit board, respectively. The housing of the connector further has a pair of flanges (13) and a receiving space (16) defined between the flanges. The inner PCB defines a set of filter devices received in the receiving space.
摘要:
An electrical connector (1) has a first port (11) with a number of first terminals (21) received therein, a second port (12) with a number of second terminals (22) received therein, a number of third terminals (23) located between the first and second terminals and a moveable port switch (30) assembled to the first and second ports. Each of said first and second terminals defines a tail portion (212, 222) extending outside the first and second ports, respectively. The port switch can drive the tail portions of the first and second terminals to electrically connect with the third terminals, respectively and alternately.
摘要:
A jack (1) connector comprises an insulating housing (10), a plurality of different contacts (21), (22), (23), (24), and an optical device (30). The insulative housing comprises a mating portion (11), a mounting portion (12), side portions (13), and a cavity space (14). The mating portion defines an opening (111) extending therethrough and communicating with the cavity space. The contacts are retained in the insulative housing, each contact having an upper end received in the cavity space and a tail end. The optical device is installed in the insulative housing and has an engaging portion for contacting an optical fiber plug connector, and a number of tail portions. A first distance between the engaging portion and the mating portion is longer than a second distance between the upper end of the contact and the mating portion.
摘要:
An electrical card connector (100) for compatibly electrically connecting with a number of electronic cards (5), includes an insulator (1) defining a number of recesses (111, 112, 113, 114) for insertion of the electronic cards, a number of contacts (2) assembled to the insulator (1) and a protective device (3) provided with a pair of resilient arms (312). Each resilient arm is formed with a hook (3121) engageable with the insulator. The protective device slides to expose the contacts when a suitable card is inserted.
摘要:
An electrical card connector (100) for electrically connecting an electrical card with a printed circuit board includes an integral molded insulative housing (1) with a plurality of passageways (17) and a plurality of conductive contacts (2) received in the passageways. Each contact includes a main body (21), a contacting portion (22) for electrically contacting with the card, and a soldering portion (23) for soldering the electrical card connector to the printed circuit board. The integral insulative housing further includes a base member. The passageways are defined in the base member.