Bidirectional geared motor

Abstract

The invention relates to a bi-directional gear motor; a transmission gear inside the outside shell of the motor is a pair of meshed driving and driven gears, and a main shaft of the driving gear and an auxiliary shaft of the driven gear are arranged. The motor is characterized in that the transmission gear has the following standards: the pressure angle is 22.5 degrees, the central distance is 31.3mm, the modulus is 2.75 and the number of gears is 11. The motor reduces the overlap coefficients of gears, automatically adjusts the radial gap of gears and the gap at the meshing line of gears; reduces the radial size, improves the working press and mechanical efficiency, and promotes the high-temperature starting performance, lowers the production cost and improves the economic benefit by optimizing the general structure comprising a shaft sleeve, a sealing ring, etc.

Description

technical field [0001] The invention relates to a high-pressure hydraulic gear motor as an actuator of a hydraulic system, which is suitable for hoisting machinery, construction machinery, environmental protection machinery, petroleum machinery and the like. Background technique [0002] As the actuator of the hydraulic system, the gear motor is widely used in the hydraulic system of construction machinery such as loaders, excavators, and cranes. The existing 04-25mL / r gear motors have the following problems in practical applications due to structural limitations: [0003] see Figure 5 , Image 6 As shown, the driving gear 605 and the driven gear 606 in the 04~25mL / r gear motor structure generally adopt 2 modules of 16 teeth, the center distance is 33mm, and the gear pressure angle is the current GB / T1356-1988 "Involute Cylinder The standard gear with a pressure angle of 20°. Due to the large overlap coefficient and backlash when the gears mesh, the gear motor tends to he...

AI Technical Summary

Problems solved by technology

[0003] see Figure 5 , Image 6 As shown, the driving gear 605 and the driven gear 606 in the 04~25mL / r gear motor structure generally adopt 2 modules of 16 teeth, the center distance is 33mm, and the gear pressure angle is the current GB / T1356-1988 "Involute Cylinder The standard gear with a pressure angle of 20°. Due to the large overlap coefficient and backlash when the gears mesh, the gear motor tends to heat up the hydraulic oil during work, resulting in low volumetric efficiency and short service life. Figure 5 Among them, a is the base circle, and b is the index circle;

[0004] Image 6 As shown, the front cover 601, the casing 604 and the rear cover 609 in the existing structure are three-stage structures, and the thickness of the front cover 601 reaches 71 mm. Due to its thickness restriction, it is difficult to ensure the installation holes of each component at the existing technological level. The dimensional accuracy increases the radial load of the bearing, increases the frictional moment, and makes assembly more difficult, which reduces the starting torque of the gear motor;

[0005] like Figure 7 As shown, the bushing 603 adopts a traditional split bushing, and it is difficult for the two bushings to reach the same position when the pressure floats axially in the casing 604, resulting in poor sealing of the end face, and the volumetric efficiency of the gear motor is very low during normal operation. hard to get guarantees;

[0006] like Figure 8 As shown, the sealing structure of the housing adopts a separate form, that is, the outer sealing ring 602, the inner edge sealing ring 607 and the inner ring sealing ring 608 are in the form of separate structures. This form has poor sealing integrity, and the gaps The leakage cannot be controlled, and the friction coefficient is relatively large;

[0007] In order to ensure normal starting of gear motors with traditional structures, the only way to reduce the compression of sealing elements is to sacrifice volumetric efficiency to improve the starting performance of gear motors. However, under high temperature working conditions, the viscosity of hydraulic oil will increase with temperature. High and low, such a method will only cause the volumetric efficiency of the gear motor to drop sharply as the temperature rises, until it does not start, and eventually leads to the failure of the gear motor

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