A forced lubrication structure for high speed drive gear trains

Abstract

The application discloses a forced lubrication structure for a high-speed transmission gear system, which comprises a gear system shell, a convex shaft is distributed in the gear system shell, and a funnel-shaped gear assembly is distributed on the convex shaft; a first oil injection channel is formed in the central axis of the convex shaft; the funnel-shaped gear assembly comprises a large-opening end and a small-opening end; a second transmission gear is distributed in the inner cavity of the small-opening end, and a second rolling bearing is sleeved on the outer side of the second transmission gear and connected and fixed with the gear system shell; a second oil injection channel is arranged opposite to one side of the first transmission gear; a first throttling lubricating oil groove is formed between the first transmission gear and the second rolling bearing; a second throttling lubricating oil groove is formed in the inner side region of the first rolling bearing at the inclined groove cavity in the middle inner cavity of the funnel-shaped gear assembly; and an oil return channel is distributed on the outer side of the second rolling bearing. The application has the advantages of reliable operation, good lubrication effect, good heat transfer and cooling effect and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical power transmission gear lubrication, in particular to a forced lubrication structure for high-speed transmission gear train. BACKGROUND

[0002] Gear is one of the most important basic parts in mechanical products, which is a form of transmission of mechanical movement and power transmission, has the characteristics of large power transmission, accurate rotation ratio, etc., but at the same time, the gear also needs effective lubricating oil for lubrication, and with the current gear transmission continuously developing towards high speed, heavy load, high and low temperature, if the lubrication is improper and the lubrication effect is poor, gear failure will occur, resulting in mechanical failure and even damage. The factors affecting gear lubrication mainly include:

[0003] 1. Temperature factor, when the temperature drops, the lubricating oil will become thick, and when the temperature rises, it will become thin. Therefore, low viscosity lubricating oil is needed under low temperature conditions, and thick oil is needed under high temperature conditions to prevent dry friction between metals.

[0004] 2. Speed factor, the faster the gear rotates, the shorter the time for the lubricant to squeeze into the gear, and the lubricating oil is more prone to clumping and thickening under high-speed transmission. Therefore, high viscosity lubricating oil is used for low speed, and low viscosity oil is used for high speed.

[0005] 3. Load factor, high viscosity oil can resist heavy load and prevent metal-to-metal collision better than thin oil, so low viscosity lubricating oil is needed for light load, and high viscosity lubricating oil is needed for high load.

[0006] However, in the actual operation of the gear train, the faster the speed (low viscosity oil is used for high speed) is generally accompanied by higher temperature (thick oil is needed under high temperature conditions), so the optimization design of the lubrication system for the high-speed gear train is more important for maintaining the normal and efficient operation of the gear. SUMMARY

[0007] The present application provides a forced lubrication structure for high-speed power transmission gear train with good lubrication effect and high reliability.

[0008] To achieve the above purpose, the present application adopts the following technical solutions:

[0009] The application discloses a forced lubrication structure for a high-speed transmission gear system, which comprises a gear system shell, a convex shaft is distributed in the gear system shell, and a funnel-shaped gear assembly is distributed on the convex shaft; a first oil injection channel is arranged in the central axis of the convex shaft; the funnel-shaped gear assembly comprises a large-mouth end and a small-mouth end; the inner cavity of the large-mouth end is distributed on the convex shaft through a first rolling bearing; the outer side of the large-mouth end is distributed with a first transmission gear; the inner cavity of the small-mouth end is distributed with a second transmission gear, and the outer side of the second transmission gear is sleeved with a second rolling bearing and connected and fixed with the gear system shell; a second oil injection channel is arranged opposite to the side of the first transmission gear; the first transmission gear and the second rolling bearing form a first throttling lubricating oil groove; the inclined groove cavity in the middle cavity of the funnel-shaped gear assembly, that is, the inner side region of the first rolling bearing, forms a second throttling lubricating oil groove; an oil return channel is arranged at the low position of the gear system shell; and the oil return channel is distributed at the outer side of the second rolling bearing.

[0010] Further, one end of the oil return channel is communicated with the cavity of other transmission gears.

[0011] Further, the second oil injection channel is arranged at the high position of the gear system shell.

[0012] Further, the gear front cover is further arranged at the outer side of the second rolling bearing.

[0013] Further, the funnel-shaped gear assembly is integrally formed.

[0014] Further, the inclination angle of the inclined groove cavity is 20-40 degrees.

[0015] Further, the inclination angle of the inclined groove cavity is 30-35 degrees.

[0016] The application has the following beneficial effects compared with the prior art:

[0017] (1) The present application is provided with a funnel-shaped gear combination, and further forms two throttle lubricating oil grooves in the key area, so as to realize forced lubrication of the high-speed rotating funnel-shaped gear combination. The mechanism of the effective lubrication of the forced lubrication is that the second oil injection channel is directly used for spraying lubrication on the first transmission gear, the lubricating oil sprayed from the second oil injection channel is divided into two paths along the oil channels on both sides of the first transmission gear, one of which flows into and collects in the first throttle lubricating oil groove, the first throttle lubricating oil groove is provided to realize effective heat absorption and cooling and lubrication effect of the high-speed transmission first transmission gear, and then the lubricating oil continues to flow outwards through the second rolling bearing to lubricate and cool the high-speed rotating second rolling bearing, and then flows back to the cavities of other transmission gears through the oil return channel to lubricate other gears. The other lubricating oil sprayed from the second oil injection channel flows along the other side through the first rolling bearing, and then flows into and collects in the second throttle lubricating oil groove to effectively lubricate and cool the high-speed rotating first rolling bearing. The first oil injection channel realizes forced injection lubrication on the second transmission gear, and part of the lubricating oil also flows back to the second throttle lubricating oil groove, and the lubricating oil collected in the second throttle lubricating oil groove finally passes through the second transmission gear and then flows back to the cavities of other transmission gears through the oil return channel to lubricate other gears. By providing several structures in the gear train housing, the high-efficiency lubrication and cooling of the entire gear train can be realized, and the reliability of the high-speed transmission gear train can be significantly improved.

[0018] (2) By limiting the inclination angle of the chute cavity to 20-40 degrees, the two throttle lubricating oil grooves can effectively ensure that the optimal amount of lubricating oil is collected to play the role of lubrication and effective heat absorption and cooling, and can also effectively prevent the collection of too much lubricating oil from affecting the high-efficiency rotation of the gear (i.e. causing resistance). If the angle is too low, the lubrication and heat absorption and cooling effect will be poor, and if the angle is too large, not only will it affect the high-efficiency rotation of the gear and form resistance, but also the lubricating oil will be too much to affect timely heat conduction cooling and other beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a perspective cutaway view of the present application;

[0020] Fig. 2 is an oil flow direction mark drawing of the present application;

[0021] Fig. 3 is a perspective structure schematic view of the funnel-shaped gear combination of the present application. DETAILED DESCRIPTION

[0022] As Figs. 1-3As shown, a forced lubrication structure for high-speed transmission gear train, comprising a gear train housing 1, a convex shaft 2 is distributed in the gear train housing 1, a funnel-shaped gear assembly 6 is distributed on the convex shaft 2; a first oil injection channel 3 is opened in the center axis of the convex shaft 2; the funnel-shaped gear assembly comprises a large end and a small end, the inner cavity of the large end is distributed on the convex shaft through a first rolling bearing 11; the outer side of the large end is distributed with a first transmission gear 5; the inner cavity of the small end is distributed with a second transmission gear 8, and the outer side is sleeved with a second rolling bearing 7 and connected and fixed with the gear train housing 1; a second oil injection channel 4 is also arranged opposite to one side of the first transmission gear 5; a first throttling lubricating oil groove 1-1 is formed between the first transmission gear 5 and the second rolling bearing 7, which can play the effect of supplementary lubrication / continuous lubrication and continuous heat transfer cooling of the first transmission gear, and continuous oil injection of the oil injection channel is not necessarily required, the oil injection amount is effectively saved, and the best efficiency of unit lubricating oil is played; the inclined groove cavity in the middle cavity of the funnel-shaped gear assembly, that is, the inner side region of the first rolling bearing, constitutes a second throttling lubricating oil groove 6-1; an oil return channel 9 is opened at the low position of the gear train housing 1; the oil return channel 9 is distributed outside the second rolling bearing 7. One end of the oil return channel 9 is communicated with the cavity 1-2 of the other transmission gear 10 to supply lubricating oil to the next gear for lubrication. The transmission gear 10 of the embodiment is engaged with the first transmission gear 5 for transmission, and of course the second oil injection channel 4 is opened at the high position of the gear train housing 1 to improve the lubrication effect. After the lubricating oil is injected from the second oil injection channel 4, one way of the lubricating oil flows through the first rolling bearing 11 along the oil channel 1-3; the funnel-shaped gear assembly can be made by integral molding process to improve the reliability, and the inclination angle ∠α of the inclined groove cavity of the embodiment is between 20-40 degrees (as shown in Fig. 2 Of course, the inclination angle ∠α of the inclined groove cavity can also be preferably 30-35 degrees. It also comprises a gear front cover 12 distributed outside the second rolling bearing 7.

Claims

1. A forced lubrication structure for a high speed drive gear train, characterized by: The application relates to a gear train shell, wherein a convex shaft is arranged in the gear train shell, a funnel-shaped gear assembly is arranged on the convex shaft, a first oil injection channel is arranged in the central axis of the convex shaft, the inner cavity of the large-end of the funnel-shaped gear assembly is arranged on the convex shaft through a first rolling bearing, the outer side of the large-end is provided with a first transmission gear, the inner cavity of the small-end of the funnel-shaped gear assembly is provided with a second transmission gear, the outer side of the small-end is provided with a second rolling bearing which is fixedly connected with the gear train shell, a second oil injection channel is arranged opposite to the side of the first transmission gear, the first transmission gear and the second rolling bearing form a first throttling lubricating oil groove, the inclined groove cavity in the middle cavity of the funnel-shaped gear assembly forms a second throttling lubricating oil groove, an oil return channel is arranged in the low position of the gear train shell, the oil return channel is arranged on the outer side of the second rolling bearing, one end of the oil return channel is communicated with the cavity of other transmission gears, the inclination angle of the inclined groove cavity is 20-40 degrees, the first transmission gear is directly lubricated through the second oil injection channel, the lubricating oil is divided into two paths after being sprayed from the second oil injection channel, one path flows into the first throttling lubricating oil groove, the first throttling lubricating oil groove realizes effective heat absorption, cooling and lubrication of the high-speed transmission first transmission gear, then the lubricating oil continues to flow outwards through the second rolling bearing, lubricates and cools the high-speed rotating second rolling bearing, and then returns to the cavity of other transmission gears through the oil return channel to lubricate other gears, the other path of the lubricating oil flows through the first rolling bearing, then flows into the second throttling lubricating oil groove to effectively lubricate and cool the high-speed rotating first rolling bearing, the first oil injection channel realizes forced lubrication of the second transmission gear, part of the lubricating oil also flows back to the second throttling lubricating oil groove, and the lubricating oil in the second throttling lubricating oil groove finally passes through the second transmission gear and then returns to the cavity of other transmission gears through the oil return channel to lubricate other gears.

2. A forced lubrication arrangement for a high speed drive gear train according to claim 1, characterised in that: The second oil injection channel is arranged in the high position of the gear train shell.

3. A forced lubrication arrangement for a high speed drive gear train according to claim 1, characterized in that: The gear front cover is arranged on the outer side of the second rolling bearing.

4. A forced lubrication arrangement for a high speed drive gear train according to claim 1, characterized in that: The funnel-shaped gear assembly is integrally formed.

5. A forced lubrication arrangement for a high speed drive gear train according to claim 1, characterized in that: The inclination angle of the inclined groove cavity is 30-35 degrees.

Images