Commercial vehicle blade type variable pump

Abstract

The invention provides a commercial vehicle blade type variable pump which comprises a pump body, a rotor, blades, a positioning ring, a variable sliding block and a variable spring. An oil inlet, anoil outlet and a rotor cavity are formed in the pump body, and a concave oil suction cavity and a concave oil pressing cavity are formed in the bottom of the rotor cavity. A first groove and a secondgroove which are staggered with the oil inlet and the oil outlet correspondingly are formed in the side wall of the rotor cavity, the variable sliding block is installed in the rotor cavity, a first U-shaped part embedded in the first groove and a second U-shaped part embedded in the second groove are arranged on the peripheral face of the variable sliding block, a feedback oil cavity is formed between the first groove and the first U-shaped part, and a spring cavity is formed between the interior of the second groove and the second U-shaped part and used for installing the variable spring. The positions of the feedback oil cavity and the spring cavity both incline towards the oil suction cavity, and under the action of oil pressure in the feedback oil cavity or the elastic force of the variable spring in the spring cavity, the variable sliding block can move in the rotor cavity in the radial direction, and therefore, the operation reliability of the oil pump can be improved.

Description

Technical field [0001] The invention relates to the technical field of internal combustion engine lubrication systems, in particular to a vane type variable pump. Background technique [0002] The vane-type variable displacement pump for passenger cars usually adopts a rotary slider structure. The slider rotates around the rotating pin to compress the variable displacement spring to achieve variable displacement. The variable spring and the oil inlet cavity are on the same side. The advantage of this arrangement is that the structure is compact and adaptable. The speed range is wide. Compared with passenger cars, commercial vehicles have lower speeds, higher torques and larger loads. Therefore, the lubrication system requires greater flow and higher pressure. At the same time, there are higher requirements for reliability, life, and power consumption. Block structure, the variable spring and the oil inlet cavity on the same side will cause turbulence at the oil inlet, and the va...

AI Technical Summary

Problems solved by technology

Compared with passenger cars, commercial vehicles have low speed, high torque, and larger loads. Therefore, the lubrication system requires greater flow and higher pressure. At the same time, it also has higher requirements for reliability, life, and power consumption. Block structure, the variable spring and the oil inlet chamber on the same side will cause turbulent flow at the oil inlet, and the impact of the variable spring will greatly reduce the reliability of the oil pump operation

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