Dynamic pressure gear transmission device

Abstract

The invention relates to a gear transmission device, in particular to a dynamic pressure gear transmission device which is suitable for the reduction and variable speed transmission places with low noise, low weight, high loads and long service life. The dynamic pressure gear transmission device comprises a first gear and a second gear. Sealing pressure plates are installed on the two end faces of the second gear. A confined space is formed among the two sealing pressure plates, the tooth crest of the first gear, the tooth root of the second gear and the engagement surface of the first gear and the second gear. The confined space is filled with lubricating oil. When the gears begin to be engaged, the size of the confined space is decreased, and oil pressure of the lubricating oil in the confined space is increased. When the oil pressure in the confined space reaches a set value, a constant pressure oil drain valve installed on one of the sealing pressure plates is used for draining oil, so that the oil pressure in the confined space is kept constant. When the gears are engaged out, the size of the confined space is increased, and the oil pressure of the lubricating oil in the confined space is decreased. When the oil pressure in the confined space is smaller than the set value, the constant pressure oil drain valve is reset, a negative pressure air inlet valve installed on the other sealing pressure plate is opened, and thus the engaging-out resistance is reduced.

Description

technical field [0001] The invention relates to a gear transmission device, in particular to a dynamic pressure gear transmission device, which is suitable for places with low noise, light weight, high load and long service life for reduction / variation transmission. Background technique [0002] Existing gear transmission technology: gears generally have straight teeth, helical teeth, and herringbone teeth; gear tooth surface hardness is generally soft tooth surface, medium hard tooth surface, and hard tooth surface. [0003] (1) In order to improve the load-bearing capacity and service life of the gear, in terms of material selection and heat treatment process: from the past soft tooth surface gear transmission (45# steel quenched and tempered, the tooth surface hardness is 225-269HB, the load-carrying capacity Low) is improved to medium-hard tooth surface gear transmission (using 42CrMo, 35CrMo medium carbon alloy steel quenched and tempered, the tooth surface hardness is ...

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Problems solved by technology

[0003] (1) In order to improve the load-bearing capacity and service life of the gear, in terms of material selection and heat treatment process: from the past soft tooth surface gear transmission (45# steel quenched and tempered, the tooth surface hardness is 225-269HB, the load-carrying capacity Low) is improved to medium-hard tooth surface gear transmission (using 42CrMo, 35CrMo medium carbon alloy steel quenched and tempered, the tooth surface hardness is 285 ~ 323HB, the bearing capacity has been improved), and then improved to hard tooth surface gear transmission (using 20CrMnTi, 20CrMnMo, 20CrNi2Mo, 20Cr2Ni4 and other low-carbon alloy steels, tooth surface carburizing or carbonitriding quenching treatment, tooth surface hardness is 60±2HRC) to improve the bearing capacity, the disadvantage is that the price of materials is increasing, production equipment, testing The accuracy of the equipment is also constantly improving, and the economic benefits have been greatly improved, but there is no fundamental improvement in the environmental benefits, even at the expense of the environment.

[0004] (2) In order to improve the bearing capacity and reduce the noise, the design structure was improved from straight gear transmission to helical gear transmission to improve the coincidence degree of the gear pair. Although the noise was greatly reduced, the load on the tooth surface was uneven and the support The axial force is added to the bearing, which affects the life of the bearing to a certain extent; and then develops from the helical gear transmission to the herringbone gear transmission structure, which improves the coincidence, but the accuracy of the gear is still affected to a certain extent, the process is relatively complicated, and the manufacturing cost A substantial increase

[0005] (3) In order to improve the service life and reduce noise, the machining accuracy of gears must generally be controlled above grade 7, or even above grade 5. The equipment investment is huge, and the fatigue strength of the gears still cannot achieve the desired effect, and wear is inevitable

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