Oil supplementing pump for gear-box of 2-3.5 ton fork truck

Abstract

The invention relates to an oil supplementing pump for a gear-box of a 2-3.5 ton fork truck. The pump comprises a pump body, a stator, a driving gear, a driven gear, a bushing, an oil seal and a sealing ring; wherein, the driven gear is an inner engaging gear ring and is embedded inside the pump body; the driving gear is sheathed on a stator axis, a crescent plate is arranged on the pump body at the gap between the driving gear and the upper part of the driven gear, an oil pressing chamber is arranged at the upper part of the pump body at the left side of the crescent plate, and an oil absorbing chamber is arranged at the upper part of the pump body at the right side of the crescent plate; the inner hole wall of the driving gear is evenly distributed with more than two axial grooves. The oil supplementing pump can meet the special requirements of the 2-3.5 ton gear-box provided with the pump, so as to lead the discharge capacity to be in accordance with the using requirements of the gear-box, and ensure a slender shaft to pass through an inner hole of the stator to drive the working pump; the oil supplementing pump has the advantages of stable work, reliable performance as well as convenient installation and maintenance; the experiments prove that the oil supplementing pump can completely meet the using requirements and is strengthened for 200h without fault. The oil supplementing pump has simple structure and low cost, and the cost does not excess that of the existing oil supplementing pump.

Description

technical field [0001] The invention relates to an oil charge pump for a gearbox of a 2-3.5 ton forklift. Background technique [0002] The charge pump is an important part of the gearbox of a hydraulic transmission forklift. It has three functions: one is to provide uninterrupted pressure oil to the control valve and clutch to realize the gear control of the gearbox; the other is to provide a large amount of oil to the torque converter. A steady stream of pressure oil is used as the medium of power transmission, while maintaining a certain pressure inside the torque converter to prevent cavitation; the third is to drive the circulating flow of transmission oil to cool the high temperature generated by the torque converter and clutch to ensure the smooth operation of the gearbox. At present, there are mainly three kinds of charge pumps for hydraulic transmission forklift gearboxes in China, namely 1-3.5t forklift gearbox charge pumps, 4-5t forklift gearbox charge pumps, and ...

AI Technical Summary

Problems solved by technology

In order to realize matching with 2-3.5t hydraulic belt pump soft connection gearbox, if borrowing 1-3.5t forklift gearbox oil charge pump, but because the outer diameter of the oil charge pump stator shaft and the inner diameter of the driving gear are too small, the slender shaft cannot pass through; If you borrow the oil charge pump of the 4-5t or 5-10t forklift gearbox, although the slender shaft can pass through, the displacement of the oil charge pump is too large, exceeding more than 50% of the required amount, which will cause waste and high heat, and the gearbox cannot work normally. Work

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