Variable valve timing device

Abstract

The invention relates to a variable valve timing device. The variable valve timing device comprises a helical gear, a gear insert, a rotor and an outer cover. The helical gear is connected with the outer cover through the gear insert; a hydraulic chamber is formed through the gear insert and the outer cover; the rotor which is connected with the gear insert through a locking device is disposed in the hydraulic chamber; the middle of the rotor is connected with a cam shaft; the locking device comprises a locking pin and a locking pin hole; the locking pin is disposed on the lower surface of the rotor; the locking pin hole matched with the locking pin is formed in the upper surface of the gear insert; and an oil storing groove is formed in the bottom of the locking pin. The variable valve timing device has the advantages that the oil storing groove is formed in the bottom of the locking pin, so that a certain amount of lubricating oil is reserved in the oil storing groove of the locking pin after halt, abnormal sound produced during starting after halt for a long time is reduced, meanwhile the contact area is decreased, and the friction force is reduced.

Description

technical field [0001] The invention relates to a variable valve timing device for adjusting the phase angle of a camshaft. Background technique [0002] There is an existing helical gear variable valve timing device, the transmission part is a helical gear, which is a kind of component of the helical gear meshing mode. exist figure 1 Among them, the gear 6 is connected with the outer cover 2 through the gear insert 1 to form a hydraulic chamber, and the rotor 4 connected with the camshaft 3 is built in, and the rotor is driven by the hydraulic medium to make the phase change of the camshaft 3 relative to the crankshaft, and the circulation of the medium Realized by electromagnetic hydraulic valve. The existing design uses a pressure medium to open the locking device 5 on the rotor 4 and the gear insert 1, so that the timing is advanced. Then, the locking pin of the rotor 4 falls into the pin hole of the sprocket wheel through the reverse pressure medium to form a locked ...

AI Technical Summary

Problems solved by technology

There will be a slight sound during the opening and closing of the locking device, and the cavity formed by the outer cover 2 and the gear insert 1 has an acoustic effect, which amplifies the sound, especially when the engine is idling; In addition, the outer cover 2 is made of aluminum alloy, and the internal cavity needs to be processed as a whole, which is difficult to process, high in cost, and low in efficiency

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