A high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery

Abstract

The present application relates to the technical field of speed reduction motor, in particular to a high-efficiency heat dissipation worm gear and worm gear helical gear speed reduction motor for light load machinery, comprising a box body, the box body has a stepped hole for mounting bearings and end covers and an outer surface reinforcing rib for external heat dissipation; a motor unit, the motor unit is fixedly connected with the box body; a composite transmission mechanism, the composite transmission mechanism at least includes a parallel shaft gear stage and an interleaved shaft transmission pair. Compared with the prior art, the present application sets up the composite transmission of "helical gear first stage + worm gear first stage", the back-to-back arrangement of the conical roller bearing, the output shaft deep groove ball bearing and the axial limiting of the fixed distance ring / elastic retainer at both ends of the worm shaft, and the decoupling quantitative adjustment of the meshing side gap and the bearing pre-tightening amount by the first metal adjusting pad and the second metal adjusting pad, so as to achieve the effect of large transmission ratio and smooth output in compact volume, and the effect of high axial stiffness and low noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of speed reduction motor, in particular to a high-efficiency heat dissipation worm gear and helical gear speed reduction motor for light load machinery. BACKGROUND

[0002] The worm gear and helical gear composite speed reduction motor is widely used in food packaging, logistics sorting, light conveying and general light load equipment due to its compact size, wide transmission ratio range and smooth output. The traditional product adopts the basic architecture of "integrated box + helical gear primary speed reduction + worm gear primary speed reduction", the inside of the box is mainly lubricated by immersion oil / splashing oil, the input end is commonly sealed by end cover + gasket or simple labyrinth seal, and the output end is commonly equipped with a skeleton oil seal; the worm is supported by two end bearings, and the meshing side gap and bearing pre-tightening are preliminarily set during assembly by adjusting pads or end face gaps.

[0003] In the prior art, the Chinese patent document with publication number CN109469710B proposes that the left and right fixed flanges can be fixed together by multiple fixed frames, multiple fixed threaded rods and multiple fixed nuts, so as to stably fix the motor on the right side wall of the shell, and the power of the motor is transmitted to the connecting gear through the transmission shaft. Since the connecting gear is engaged with the transmission gear, the worm can be driven to rotate in the case of different shafts of the motor and the worm, thereby improving the installation stability of the motor. However, like the traditional method, the existing engineering path usually focuses on expanding the speed reduction ratio coverage, improving the tooth surface hardness and machining precision, optimizing the box shape and rib plate to obtain universality and certain heat dissipation capacity. However, in the application scenarios of long-time continuous operation, frequent start-stop or higher environmental temperature, the problems of meshing heat, oil temperature peak, sealing leakage and assembly consistency still affect the efficiency and service life. At the same time, due to the relatively extensive organization of oil and gas channels, the heat-force coupling design is insufficient, the meshing center drifts with temperature rise, noise rises and maintenance cost is high, etc. Therefore, the industry needs to form systematic improvements in "side gap / pre-tightening quantifiable control, oil-gas channel collaborative heat dissipation, sealing maintainability and full attitude adaptability" to achieve higher transmission efficiency, thermal stability and full-life reliability in a compact volume. Therefore, the present application discloses a high-efficiency heat dissipation worm gear and helical gear speed reduction motor for light load machinery. SUMMARY

[0004] Therefore, the present application aims to provide a high-efficiency heat dissipation worm gear and helical gear speed reduction motor for light load machinery to solve the problems of traditional composite speed reduction motor in long-time high temperature / frequent start-stop conditions, such as meshing heat and oil temperature peak, leakage and assembly dispersion, heat-force coupling deficiency, center drift and noise rise, etc.

[0005] Based on the above purpose, the application provides a high-efficiency heat dissipation worm-gear helical gear reduction motor for light-load machinery, which comprises a box body, the box body is provided with stepped holes for mounting bearings and end covers and external surface reinforcing ribs for external heat dissipation;

[0006] A motor unit is fixedly connected with the box body;

[0007] A composite transmission mechanism comprises a parallel-shaft helical gear transmission stage installed in an input cavity of the box body and a worm-gear transmission pair formed by the interlaced arrangement and engagement of a worm body and a worm wheel body installed in an output cavity of the box body, the parallel-shaft helical gear transmission stage is used to realize primary speed reduction and torque transmission of the motor unit, and the worm-gear transmission pair is further used to reduce the rotating speed and output to an output shaft;

[0008] An axial positioning assembly is used to bear radial / axial load generated by the transmission mechanism and realize axial positioning, the axial positioning assembly comprises conical roller bearings arranged at two ends of the worm body and facing each other, deep groove ball bearings arranged on the output shaft, and a distance ring, an elastic shaft retainer and a hole elastic retainer used for axial limiting / positioning; further comprising a first adjusting pad arranged between an end surface of the worm wheel body and an axial supporting surface of the box body and located near a sight hole cover, the first adjusting pad is used to adjust the meshing side clearance of the worm-gear pair; a second adjusting pad arranged between the cover and the outer ring of the conical roller bearing, the second adjusting pad is used to adjust the pre-tightening amount of the worm bearing;

[0009] A lubrication and heat dissipation assembly and a sealing assembly, the lubrication and heat dissipation assembly is arranged in the lower oil pool and the end cover area of the box body, and is used for splash lubrication and heat removal of the transmission pair and the bearing; the sealing assembly is arranged at the input end cover and the output end cover position, and is used for sealing and isolating the input side of the motor and the extended end of the output shaft.

[0010] Preferably, the parallel-shaft gear stage is a helical gear transmission, specifically comprising an input driving gear arranged on the motor shaft and an input driven gear engaged with the input driving gear; the interlaced shaft transmission pair comprises a worm-gear formed by the engagement of the worm body and the worm wheel body, the input driven gear is coaxially driven connected with the worm body, the worm body is arranged along the transverse direction of the box body and supported at both ends of the box body by the conical roller bearings; the worm wheel body is arranged along the longitudinal direction of the box body and fixedly connected with the output shaft, the hub end surface of the worm wheel body abuts against the axial supporting surface of the box body through the first adjusting pad, thereby realizing the interlaced arrangement and engagement transmission of the worm and the worm wheel in the output cavity of the box body.

[0011] Preferably, the worm body is rotatably installed in the symmetrical bearing seat of the box body through the conical roller bearings at both ends, the two conical roller bearings are arranged facing each other to bear the bidirectional axial force generated by the worm engagement;

[0012] The output shaft is rotatably installed in the bearing seat of the output end of the box through a deep groove ball bearing, and is axially limited by a spacer ring and an elastic retaining ring for shaft.

[0013] Preferably, the input passive gear is matched with the key groove on the shaft neck of the worm body through the key groove arranged in the inner hole of the gear, and the first common flat key is embedded between them; the worm body is matched with the key groove on the outer circle of the output shaft through the key groove arranged in the inner hole of the worm body, and the second common flat key is embedded between them; the meshing side clearance of the worm and the gear is adjusted by changing the thickness of the first adjusting pad arranged between the end face of the worm body and the supporting face of the box; the pre-tightening of the worm bearing is adjusted by changing the thickness of the second adjusting pad arranged between the cover and the outer ring of the tapered roller bearing, and the first adjusting pad and the second adjusting pad are metal adjusting pads.

[0014] Preferably, the lubrication and heat dissipation assembly comprises:

[0015] The oil baffle arranged adjacent to the worm body has a flow guide edge formed along the circumference, which flings oil to the meshing area of the worm and the gear and the bearing area on both sides during operation;

[0016] The oil return channel arranged on the inner wall of the box and / or the spiral flow guide ribs on the inner wall guide the oil from the meshing area and the bearing area back to the oil pool at the bottom of the box;

[0017] The vent plug arranged on the upper part of the box is used to balance the pressure inside and outside the box and to inhibit the escape of oil mist caused by temperature rise;

[0018] The sight glass cover arranged on the side wall of the box at the normal oil level height is used to observe the oil level and oil quality in real time;

[0019] The oil plug arranged at the lowest point of the bottom of the box is used for oil discharge and maintenance;

[0020] The integral heat dissipation reinforcing ribs and / or sheet-shaped heat dissipation surfaces on the outer surface of the box;

[0021] The oil baffle, the oil return channel, the spiral flow guide ribs on the inner wall, the vent plug, the sight glass cover and the oil plug jointly define the partition structure of the upper air chamber and the lower oil chamber in the direction of gravity in space, and the oil liquid brings the friction heat of the tooth surface and the bearing to the box during operation, and then flows back to the oil pool after convective heat dissipation on the outer surface.

[0022] Preferably, the sealing assembly comprises:

[0023] The non-contact seal on the input side is formed by the cooperation of the cover and the gasket, the gasket is embedded between the cover and the input shaft, and a multi-stage annular gap labyrinth channel is formed at the input end of the box, and a set gap is maintained between the rotating surface of the end of the input shaft and the cover;

[0024] The output side contact seal is press-fitted into the stepped hole of the box output end or the end hole of the cover by a double-lip oil seal, and the double-lip oil seal is sealed with the polished running surface of the output shaft towards the oil cavity side.

[0025] The holes are provided with elastic retaining rings at the end steps of the input end and the output end of the box, respectively, to axially limit the oil seal or the end cover.

[0026] Preferably, the vent plug is arranged on the upper surface of the box and is higher than the addendum circle of the worm body in the vertical direction, the inside of the vent plug is provided with an anti-back oil structure and a breathable one-way valve element, and the vent path is provided with a detachable oil mist capturing core.

[0027] Preferably, the box is provided with a thickened heat-conducting rib area near the outer wall opposite to the worm body, the inside of the thickened heat-conducting rib area corresponds to the meshing area of the worm body, and the outside forms a sheet-shaped heat dissipation surface; the oil retaining ring is arranged at a splash radius greater than the radius of the indexing circle of the worm body, so that the splashed oil first covers the tooth surface of the worm body and then falls back to the tooth surface of the worm body, to preferentially cool the high-heat area; the inner wall of the box is formed with a helical flow guide rib along the axial direction of the worm body, which is consistent with the rotation direction of the worm, for pushing the oil to the bearing areas at both ends.

[0028] Preferably, the worm body adopts a hard tooth surface structure of carburizing and quenching and fine grinding, the worm body adopts a zinc-based alloy or aluminum bronze material, and the input driving gear and the input driven gear adopt helical gears of carburizing and quenching and gear grinding.

[0029] Preferably, a replaceable thin-wall shaft sleeve is arranged at the output side seal as the running surface of the double-lip oil seal, the outer circle of the shaft sleeve forms multiple running areas segmented in the circumferential direction for misalignment use, and the sealing surface is updated by rotating or replacing the shaft sleeve during maintenance; and the box still maintains the partition structure of the upper air cavity and the lower oil cavity in different installation postures to ensure a stable oil level and low leakage.

[0030] The beneficial effects of the present application are as follows:

[0031] 1. The high-efficiency heat dissipation worm gear helical gear reduction motor for light-load machinery is provided with a composite transmission of "helical gear one stage + worm gear one stage", and the two conical roller bearings arranged back-to-back at both ends of the worm shaft, the output shaft deep groove ball bearing, and the axial limiting of the distance ring / elastic retaining ring, and the first / second metal adjusting pad is used to decouple and quantitatively adjust the meshing side gap and the bearing pre-tightening amount, so as to obtain a large transmission ratio and smooth output in a compact volume, and to balance the high axial stiffness and low noise; the assembly consistency is quantitatively controlled by "thickness", the contact spots and side gaps are stable, the vibration and meshing heating caused by assembly deviation are reduced, a stable reference is provided for subsequent heat dissipation and sealing performance, and the efficiency and service life are comprehensively improved.

[0032] 2. The high-efficiency heat dissipation worm gear helical gear reduction motor for light-load machinery, by setting the oil baffle + inner wall backflow channel / spiral flow guide rib and the thickened heat conduction rib area / plate-shaped heat dissipation surface opposite to the meshing area of the worm, and arranging the static oil level, air vent plug, sight glass cover, and oil drain plug according to the "upper air chamber - lower oil chamber" partition, the passive circulating oil circuit and high-efficiency heat conduction channel are formed during operation, the meshing area and the two bearings with high heat are preferentially cooled, the oil temperature peak and stirring loss are reduced, and the effects of maintaining the continuity of the oil film and the stability of the contact spots are achieved; thermal deformation and meshing drift are inhibited, and the efficiency and reliability are significantly improved under long-term continuous working conditions, and a stable system of thermal-force coupling is formed with the precise setting of the upstream side gap / pre-tightening.

[0033] 3. The high-efficiency heat dissipation worm gear helical gear reduction motor for light-load machinery, by setting the input end non-contact labyrinth seal and the output end double-lip oil seal, limiting the end of the elastic check ring for the hole, and additionally providing a replaceable thin-wall shaft sleeve as a running-in surface at the output end, and arranging a breathable one-way valve and an oil mist capturing core in the air passage, the effects of low leakage, low pollution, and low wear are still maintained under multi-posture installation and pressure pulsation; the oil seal running-in surface can be used in error or quickly replaced, significantly reducing downtime and maintenance costs; combined with the stable transmission stiffness and oil circuit heat dissipation, a full-link reliability closed loop from the tooth surface to the seal is formed, enabling the entire machine to maintain high efficiency, low failure, and easy maintenance throughout its life cycle. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only a part of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0035] Figure 1 It is a first internal perspective view of the present application.

[0036] Figure 2 It is a second internal perspective view of the present application.

[0037] Figure 3 It is a schematic diagram of the working process of the axial positioning system of the present application.

[0038] Figure 4 It is a schematic diagram of the lubrication and heat dissipation circulation process of the present application.

[0039] Figure 5 It is a schematic diagram of the cooperation process of the sealing assembly of the present application.

[0040] The symbols in the figure are:

[0041] 1, motor unit; 2, input driven gear; 3, input driving gear; 6, breather plug; 7, sight plug; 8, first adjusting washer; 9, worm body; 10, box; 11, cover; 12, hole elastic retainer; 13, washer; 14, second adjusting washer; 15, tapered roller bearing; 16, oil retaining ring; 17, worm body; 18, first plain key; 19, shaft elastic retainer; 20, oil plug; 21, spacer ring; 22, deep groove ball bearing; 24, double lip oil seal; 25, second plain key; 26, output shaft. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific examples.

[0043] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the components or objects before the terms encompass the components or objects listed after the terms and their equivalents, without excluding other components or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, which can change when the absolute positions of the described objects change.

[0044] As Figures 1 to 5The high-efficiency heat dissipation worm gear and worm gear helical gear reduction motor for light load machinery is shown, comprising: a box body 10, the box body 10 has a stepped hole for mounting bearing and end cover and an outer surface reinforcing rib for external heat dissipation; a motor unit 1, the motor unit 1 is fixedly connected with the box body 10; a composite transmission mechanism, the composite transmission mechanism comprises a parallel shaft helical gear transmission stage installed in the input cavity of the box body 10, and a worm gear transmission pair formed by the interlaced arrangement and meshing of a worm body 17 and a worm wheel body 9 installed in the output cavity of the box body 10, the parallel shaft helical gear transmission stage is used to realize primary speed reduction and torque transmission of the motor unit 1, and the worm gear transmission pair is further used to reduce the rotating speed and output to an output shaft 26; an axial positioning assembly, the axial positioning assembly is used to bear the radial / axial load generated by the transmission mechanism and realize axial positioning, the axial positioning assembly comprises: conical roller bearings 15 arranged at both ends of the worm body 17 and arranged oppositely, a deep groove ball bearing 22 arranged on the output shaft 26, and a distance ring 21, an elastic shaft collar 19 and a hole elastic collar 12 used for axial limiting / positioning; further comprising a first adjusting pad 8 arranged between the end face of the worm wheel body 9 and the axial support surface of the box body 10 and located near the sight hole cover 7, the first adjusting pad 8 is used to adjust the meshing side clearance of the worm gear-worm; a second adjusting pad 14 arranged between the cover 11 and the outer ring of the conical roller bearing 15, the second adjusting pad 14 is used to adjust the pre-tightening amount of the worm bearing; a lubrication and heat dissipation assembly and a sealing assembly, the lubrication and heat dissipation assembly is arranged in the lower oil pool and the end cover area of the box body 10, and is used for splash lubrication and heat removal of the transmission pair and the bearing; the sealing assembly is arranged at the positions of the input end cover and the output end cover, and is used for sealing and isolating the input side of the motor and the outer extension end of the output shaft 26, wherein the parallel shaft gear stage is a helical gear transmission, specifically comprising an input driving gear 3 arranged on the motor shaft, and an input driven gear 2 meshing with the input driving gear 3; the interlaced shaft transmission pair comprises a worm gear and a worm wheel meshing with the worm body 17 and the worm wheel body 9, the input driven gear 2 is coaxially driven connected with the worm body 17, the worm body 17 is arranged along the transverse direction of the box body 10 and supported at both ends of the box body 10 through the conical roller bearings; the worm wheel body 9 is arranged along the longitudinal direction of the box body 10 and fixedly connected with the output shaft 26, the hub end face thereof abuts against the axial support surface of the box body 10 through the first adjusting pad 8, so that the interlaced arrangement and meshing transmission of the worm and the worm wheel are realized in the output cavity of the box body 10, the worm body 17 is rotatably installed in the symmetrical bearing seat of the box body 10 through the conical roller bearings 15 at both ends, the two conical roller bearings 15 are oppositely arranged to bear the bidirectional axial force generated by the worm meshing; the output shaft 26 is rotatably installed in the output end bearing seat of the box body 10 through the deep groove ball bearing 22 and axially limited by the distance ring 21 and the elastic shaft collar 19.

[0045] The composite reduction motor is vertical or horizontal general installation type, the two end tapered roller bearings 15 of the worm shaft are arranged in back-to-back DB to obtain higher axial stiffness; the deep groove ball bearing 22 at the end of the output shaft 26 is interference fitted to bear radial force; the motor is connected to the box 10 by B5 flange or direct connection end cover, the reinforcing ribs on the outer surface of the box 10 are arranged according to the main heat dissipation direction to improve the natural convection heat dissipation efficiency and consider the stiffness / weight;

[0046] The motor unit 1 is directly connected to the box 10 through the flange, the input driving gear 3 drives the input driven gear 2 to complete the first-stage speed reduction, and then coaxially drives the worm and the worm gear to mesh to realize the second-stage speed reduction; the worm shaft is supported by the two end tapered roller bearings 15 and pre-tightened through the second adjusting pad 14, the output shaft 26 is supported by the deep groove ball bearing 22 and axially limited by the spacer ring 21 / block ring; during assembly, the worm gear-worm meshing clearance is first set by the first adjusting pad 8, then the bearing pre-tightening is set by the second adjusting pad 14, and after checking the contact spots and the no-load noise, the cover 11 is sealed; during operation, the lubrication and heat dissipation assembly establishes an oil path of “splashing-backflow-splashing” in the box, the sealing assembly isolates the oil path from the outside world to ensure long-term stable operation, the composite reduction of “helical gear first stage + worm gear and worm first stage” is adopted, the front-stage helical gear transmission has high efficiency and low noise, the rear-stage worm gear and worm have large transmission ratio and self-locking characteristics, and the two are coupled in the same box 10 to obtain large reduction ratio and smooth output in a compact volume; the reinforcing ribs on the outer surface of the box 10 improve heat dissipation and overall stiffness and reduce the influence of thermal deformation on meshing; the two end tapered roller bearings 15 of the worm are arranged towards each other, having high axial stiffness and being able to bear thrust in both directions; the output shaft 26 bears radial load by the deep groove ball bearing 22, cooperates with the spacer ring 21 and the elastic block ring for limiting, and has simple structure and convenient assembly and disassembly; the two metal adjusting pads decouple the “clearance” and “pre-tightening” into quantitatively adjustable parameters, facilitating batch assembly consistency control; the whole machine considers the stiffness-heat dissipation-assembly adjustment, improves the service life and reliability.

[0047] As shown in Figures 1 to 3 the input driven gear 2 is matched with the key groove on the shaft neck of the worm body 17 through the key groove arranged in the gear inner hole, and is embedded between the two by the first ordinary flat key 18; the worm gear body 9 is matched with the key groove on the outer circle of the output shaft 26 through the key groove arranged in the inner hole of the worm gear body 9, and is embedded between the two by the second ordinary flat key 25; the worm gear-worm meshing clearance is adjusted by changing the thickness of the first adjusting pad 8 arranged between the end face of the worm gear body 9 and the support surface of the box 10; the worm bearing pre-tightening is adjusted by changing the thickness of the second adjusting pad 14 arranged between the cover 11 and the outer ring of the tapered roller bearing 15, and the first adjusting pad 8 and the second adjusting pad 14 are metal adjusting pads;

[0048] In one embodiment, the first ordinary flat key 18 and the second ordinary flat key 25 are selected according to GB / T 1096. The key and keyway fit tolerance adopts N9 / P9. The worm gear-worm meshing backlash is finely adjusted by the thickness of the first adjusting shims (8 pieces), with a recommended target backlash of 0.06–0.18 mm (measured at the pitch circle). The adjusting shims are made of stainless steel or phosphor bronze, with thicknesses of 0.02, 0.05, 0.10, and 0.20 mm that can be combined and stacked, with the total thickness difference controlled within ±0.01 mm. The bearing preload is set by the second adjusting shim (14), with an axial preload displacement of 0.02–0.08 mm (checked by the bearing starting torque or temperature rise method). The assembly sequence is: initial assembly—blueing inspection—backlash measurement—shim replacement / stacking—reassembly—retest. The torque locking sequence is performed diagonally in steps, ultimately covering 60%–80% of the tooth surface length and 40%–60% of the tooth height with contact spots. For compliance standards, the standardized connection of the first ordinary flat key 18 and the second ordinary flat key 25 ensures reliable torque transmission and convenient processing / replacement; the first adjusting shim 8 is used to independently correct the worm gear-worm backlash, adjusting the meshing from being too tight / heating or too loose / knocking to the optimal point of overall noise and efficiency; the second adjusting shim 14 is used to independently set the preload of the tapered roller bearing 15, eliminating axial clearance and avoiding excessive preload that leads to temperature rise and wear; the two shims change the assembly sensitivity from "worker's feeling" to "thickness quantification", significantly improving consistency and maintainability.

[0049] like Figure 1 , Figure 2 , Figure 4 As shown, the lubrication and heat dissipation assembly includes:

[0050] The oil baffle ring 16 is located adjacent to the worm body 17. The oil baffle ring 16 forms a guide edge along the circumference. During operation, it throws the oil towards the worm-worm wheel meshing area and the bearing areas on both sides.

[0051] The oil return channel and / or spiral guide ribs on the inner wall of the housing 10 guide the oil back to the bottom oil sump of the housing from the meshing area and the bearing area.

[0052] The vent plug 6 located on the upper part of the housing 10 is used to balance the pressure inside and outside the housing 10 and suppress the escape of oil mist caused by temperature rise.

[0053] The sight glass cover 7, located on the side wall of the housing 10 at the normal oil level, is used to observe the oil level and oil quality in real time.

[0054] The oil plug 20, located at the lowest point of the bottom of the housing 10, is used for draining oil and maintenance.

[0055] The outer surface of the enclosure 10 features integrally formed heat dissipation reinforcing ribs and / or sheet-like heat dissipation surfaces;

[0056] The oil baffle 16, the oil return channel, the inner wall spiral flow guide, the breather plug 6, the sight glass cover 7 and the oil plug 20 jointly define the partition structure of the upper air chamber and the lower oil chamber in the space along the gravity direction, and the oil liquid is brought to the tank 10 by the friction heat of the tooth surface and the bearing during operation, and is returned to the oil pool after heat dissipation by convection of the outer surface;

[0057] The static oil level is set to 1 / 3-1 / 2 of the diameter of the worm division circle, the inner wall oil return channel of the tank 10 has a cross-sectional area of 30-80 mm2, and a 1°-3° longitudinal slope is arranged to guide the return flow to the oil pool; the inner wall spiral flow guide is consistent with the rotation direction of the worm, and the lead is 0.8-1.2 times of the lead of the worm, so as to directionally transport the splashed oil to the bearing area at both ends; the height of the flow guide edge of the oil baffle 16 is 1.0-1.5 mm, and the outer diameter is greater than the radius of the worm gear division circle, so as to preferentially cover the high-heat meshing area. The breather plug 6 on the upper surface of the tank 10 is used for thermal expansion balance and reduction of oil mist escape, and the side wall sight glass cover 7 is located at the position of the static oil surface ±5 mm for inspection; the oil drain plug 20 at the lowest point is convenient for maintenance, and an external fan or a micro-plate fin heat exchanger can be added as necessary to realize enhanced convection; the oil baffle 16 directionally throws the splashed oil to the meshing area and the bearing area, improves the oil film covering efficiency, and preferentially cools the high heat source; the inner wall return channel / spiral flow guide builds a passive circulating oil circuit, reduces stirring loss and oil temperature peak; the breather plug 6 balances the internal and external pressure difference and inhibits the oil mist escape caused by the "breathing effect"; the sight glass cover 7 is convenient for rapid inspection of the oil level / oil quality without stopping the machine; the oil plug 20 is placed at the lowest point to facilitate complete oil drainage; the heat dissipation ribs of the tank 10 increase the convection area, and cooperate with the oil circuit to form an efficient oil-wall-air heat chain;

[0058] The thickened heat conduction rib area is arranged on the outer wall of the tank 10 close to the worm gear body 9, the inner side of the thickened heat conduction rib area corresponds to the meshing area of the worm gear body 9, and the outer side forms a sheet-shaped heat dissipation surface; the oil baffle 16 is arranged at a splashing radius greater than the radius of the division circle of the worm gear body 9, so that the splashed oil covers the tooth surface of the worm body 17 first and then falls to the tooth surface of the worm gear body 9, so as to preferentially cool the high-heat area; the inner wall of the tank 10 is preferably formed with a spiral flow guide consistent with the rotation direction of the worm along the axial direction of the worm body 17, for pushing the oil liquid to the bearing area at both ends;

[0059] The thickness of the thickened heat conduction rib area corresponding to the meshing area of the worm gear is increased by 1.5-2.0 mm than the periphery, and the outer side is formed with a sheet-shaped heat dissipation surface with a single sheet width of 12-18 mm and a spacing of 10-15 mm. The height of the inner wall spiral flow guide rib is 0.8-1.5 mm, the top width is 1.0-2.0 mm, and the round angle R0.5 is used to reduce the oil film shear resistance; the flow guide rib end forms a collection groove (2-3 mm deep) at the bearing cavity, so that the oil return preferentially wets the roller and the retainer. The oil retaining ring 16 and the flow guide rib combination makes the splashing oil first cover the worm gear tooth top and the meshing point, and then falls back to the worm gear surface and is sent to the bearing through the rib, realizing the closed loop heat exchange path of "meshing-bearings-oil pool".

[0060] As shown in Figure 1 , Figure 2 , Figure 5 The sealing assembly comprises:

[0061] The sealing assembly comprises:

[0062] The non-contact seal on the input side is formed by the cooperation of the cover 11 and the gasket 13, the gasket 13 is embedded between the cover 11 and the input shaft, and a multi-stage annular gap labyrinth channel is defined at the input end of the box body 10, and a set gap is maintained between the rotating surface of the input shaft end and the cover 11;

[0063] The contact seal on the output side is formed by the double-lip oil seal 24 being pressed into the stepped hole at the output end of the box body 10 or the end hole of the cover 11, and the double-lip oil seal 24 is sealed and cooperated with the polished running surface of the output shaft 26 towards the oil cavity side;

[0064] The hole is provided with an elastic check ring 12 at the end step of the input end and the output end of the box body 10, respectively, for axially limiting the oil seal or the end cover;

[0065] The input side labyrinth seal is composed of 3-5 stages of annular gaps by the cover 11 and the gasket 13, the single stage gap is 0.2-0.5 mm, and the total axial length is greater than or equal to 6 mm; the labyrinth cavity is provided with an oil return groove opening into the tank to reduce external penetration; the output side adopts a double-lip oil seal 24 (material FKM 70-80, with a stainless steel spring), and the lip is directed to the oil side; the shaft neck (or shaft sleeve) surface roughness Ra is less than or equal to 0.2 μm, the hardness is greater than or equal to 55 HRC, and the roundness is less than or equal to 0.03 mm; the hole elastic check ring 12 is located at the end step for axial limiting to prevent the end cover or oil seal from moving under thermal shock / pulsating pressure; for the positive pressure working condition, the last stage of the labyrinth can be additionally provided with a drain hole in communication with the air vent plug 6 to avoid the pressure accumulation in the cavity; wherein, the input end adopts a non-contact labyrinth, almost zero friction, high temperature resistance, and long service life; the output end adopts a contact type double-lip oil seal 24, the inner lip prevents leakage, and the outer lip prevents dust, and the comprehensive sealing performance is good; the hole elastic check ring 12 is used for end limiting to avoid the end cover or oil seal from moving to cause sealing failure; the partitioned sealing stabilizes the "upper air cavity-lower oil cavity" to reduce the leakage rate and pollution risk;

[0066] The replaceable thin-wall shaft sleeve is arranged at the output side sealing position as the running-in surface of the double-lip oil seal 24, the outer circle of the shaft sleeve is formed with multiple running-in areas which can be used in different positions, and the sealing surface can be renewed by rotating or replacing the shaft sleeve during maintenance; and the above-mentioned lubrication and sealing assembly still maintains the partitioned structure of the upper air cavity and the lower oil cavity in different installation postures of the tank 10 to ensure stable oil level and low leakage;

[0067] The replaceable thin-wall shaft sleeve is arranged at the output end as the oil seal running-in surface, which can be replaced in different positions or quickly replaced, significantly prolonging the total service life of the seal and reducing the downtime cost; the multi-stage running-in areas share the wear and tear to reduce the irreversible damage to the main shaft neck; at the same time, even if the installation posture of the equipment is changed, the stable oil level and low leakage can still be maintained by the partitioning of the tank 10 "upper air cavity-lower oil cavity" and the built-in oil return path, and the environmental adaptability is good; when the replaceable thin-wall shaft sleeve is arranged at the output side as the oil seal running-in surface, the shaft sleeve material is 40Cr nitriding (or stainless steel surface laser quenching), the surface hardness is HV 700-900, the depth is 0.2-0.4 mm, the wall thickness is 0.5-1.2 mm, the shaft is H7 / u6 with an interference of 0.01-0.03 mm, and the assembly cooperation can be supplemented with anaerobic glue (such as 648) to prevent loosening; the outer circle of the shaft sleeve is divided into 4-6 "available running-in areas" along the circumference, and the sealing surface can be continuously used by rotating and replacing the surface at an angle of 60°-90° during maintenance; when the wear groove width is greater than 1.5 mm or the depth is greater than 0.05 mm, it is recommended to replace it, and the recommended oil seal specification is, for example, 25x47x7 (example), the installation is assisted by a special mandrel, and an appropriate amount of lubricating grease is coated to avoid dry friction and grooving, which significantly prolongs the service life of the seal and reduces the downtime cost;

[0068] In addition, the structure of the box body 10 can ensure that the lubricating and sealing assembly maintains the partition relationship of "upper air cavity - lower oil cavity" in different installation postures, such as horizontal installation (output shaft horizontal), vertical installation (output shaft downward), vertical installation (output shaft upward), and lateral installation, and the oil level can always maintain a stable oil level, and the sealing effect of the oil seal and the shaft sleeve is not weakened due to the change of the posture, thereby ensuring the sealing life and the lubricating and heat dissipation effect.

[0069] As shown in Figure 1 , Figure 2 , the breather plug 6 is arranged on the upper surface of the box body 10 and is higher than the tooth top circle of the worm gear body 9 in the vertical direction, the inside of the breather plug 6 is provided with an anti-backflow structure and a breathable one-way valve, and a replaceable oil mist capturing core is arranged on the breather path;

[0070] The breather plug 6 is located on the upper surface of the box body 10 and is higher than the tooth top circle of the worm gear in the geometric height, the inside of the breather plug 6 is provided with a breathable one-way valve, the opening pressure is 3-8 kPa, the smooth exhaust and slow inhalation during cooling are ensured, the inhalation of external moisture / dust is reduced, the replaceable oil mist capturing core (glass fiber or sintered metal, filtering precision 0.3-1 μm) is connected in series on the breather path, and the anti-backflow baffle is arranged to avoid the direct impact of the splashed oil on the filter core; the recommended replacement period is 2000-4000 h or the pressure drop is greater than or equal to 5 kPa, the shell of the breather plug 6 is reliably grounded with the box body 10 to prevent the risk of oil mist fire caused by static electricity accumulation, and the breather plug 6 is arranged above the tooth top circle, which can effectively avoid being directly impacted by the splashed oil; the built-in breathable one-way valve balances the pressure difference between the inside and outside of the box, prevents the inhalation of moisture and dust, and reduces emulsification and wear; the oil mist capturing core can intercept fine oil mist, reduce environmental pollution and oil consumption, and the anti-backflow structure avoids the overflow of oil liquid through the breather hole, improves the cleanliness and safety of the whole machine;

[0071] The worm body 17 adopts a hard tooth surface structure of carburizing and quenching and fine grinding, the worm gear body 9 adopts zinc-based alloy or aluminum bronze material, and the input driving gear 3 and the input driven gear 2 adopt bevel gears of carburizing and quenching and gear grinding, so as to reduce the meshing friction loss and improve the bearing life and heat dissipation efficiency;

[0072] The worm body 17 is carburized and quenched and finely ground, the hard tooth surface is wear-resistant and the transmission efficiency is high; the worm gear body 9 is selected from aluminum bronze / tin bronze or zinc-based alloy, the friction pair is good, and the anti-gluing and anti-pitting are good; the bevel gears 2 / 3 are carburized and ground to improve the tooth profile accuracy and surface quality, and reduce the howling; after comprehensive modification, the contact stress distribution is more uniform, the oil film bearing capacity of the tooth surface is improved, the temperature rise is reduced, and the efficiency and life of the whole machine are improved synchronously.

[0073] Those skilled in the art should understand that the above discussion of any embodiment is only intended to be illustrative and is not intended to be in any way limiting to the scope of the present application, including the claims that follow it; the above embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other changes to the different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0074] The present application is intended to cover all such alternatives, modifications, and variations as come within the scope of the broadest possible interpretation of the appended claims. Accordingly, any and all such alternatives, modifications, equivalents, improvements and the like are intended to be encompassed by the present application.

Claims

1. A high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery, characterized by, It comprises: a box (10) having stepped holes for mounting bearings and end covers and external surface reinforcing ribs for external heat dissipation; a motor unit (1) fixedly connected with the box (10); a composite transmission mechanism comprising a parallel shaft helical gear transmission stage installed in the input cavity of the box (10) and a worm and gear transmission pair formed by the interlaced arrangement and meshing of a worm body (17) and a worm wheel body (9) installed in the output cavity of the box (10), the parallel shaft helical gear transmission stage being used to realize primary speed reduction and torque transmission of the motor unit (1), and the worm and gear transmission pair being further used to reduce the rotating speed and output to an output shaft (26); an axial positioning assembly used to bear the radial / axial load generated by the transmission mechanism and realize axial positioning, the axial positioning assembly comprising: conical roller bearings (15) arranged at both ends of the worm body (17) in a facing manner, a deep groove ball bearing (22) arranged on the output shaft (26), and a distance ring (21), an elastic shaft retainer (19) and an elastic hole retainer (12) used for axial limiting / positioning; further comprising a first adjusting pad (8) arranged between the end face of the worm wheel body (9) and the axial support face of the box (10) near the sight hole cover (7), the first adjusting pad (8) being used to adjust the meshing side clearance of the worm and gear; a second adjusting pad (14) arranged between the cover (11) and the outer ring of the conical roller bearing (15), the second adjusting pad (14) being used to adjust the pre-tightening amount of the worm bearing; a lubrication and heat dissipation assembly arranged in the lower oil pool and the end cover area of the box (10) and used to splash lubricate and take away heat from the transmission pair and the bearing; and a sealing assembly arranged at the input end cover and the output end cover positions and used to seal and isolate the input side of the motor and the outer end of the output shaft (26).

2. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 1, characterized by, The parallel shaft gear stage is a helical gear transmission, specifically comprising an input driving gear (3) arranged on the motor shaft and an input driven gear (2) meshing with the input driving gear (3); the interlaced shaft transmission pair comprises a worm and gear formed by the meshing of the worm body (17) and the worm wheel body (9), the input driven gear (2) is coaxially and drivingly connected with the worm body (17), the worm body (17) is arranged along the transverse direction of the box (10) and supported at both ends of the box (10) by the conical roller bearings, and the worm wheel body (9) is arranged along the longitudinal direction of the box (10) and fixedly connected with the output shaft (26), the hub end face of the worm wheel body (9) abuts against the axial support face of the box (10) through the first adjusting pad, so that the worm and the worm wheel are arranged in an interlaced manner and meshingly driven in the output cavity of the box (10).

3. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 1, characterized in that, The worm body (17) is rotatably installed in the symmetrical bearing seat of the box (10) through the conical roller bearings (15) at both ends, and the two conical roller bearings (15) are arranged in a facing manner to bear the bidirectional axial force generated by the meshing of the worm. The output shaft (26) is rotatably installed in the output end bearing seat of the box (10) through a deep groove ball bearing (22), and is axially limited by a constant distance ring (21) and an elastic shaft ring (19).

4. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 2, characterized by, The input passive gear (2) is matched with the key groove on the shaft neck of the worm body (17) through the key groove arranged in the gear inner hole, and is embedded between the two through a first common flat key (18); the worm body (9) is matched with the key groove on the outer circle of the output shaft (26) through the key groove arranged in the inner hole of the worm body (9), and is embedded between the two through a second common flat key (25); the worm and gear meshing side clearance is adjusted by changing the thickness of the first adjusting pad (8) arranged between the end face of the worm body (9) and the supporting surface of the box (10); the worm bearing pre-tightening is adjusted by changing the thickness of the second adjusting pad (14) arranged between the cover (11) and the outer ring of the tapered roller bearing (15), and the first adjusting pad (8) and the second adjusting pad (14) are metal adjusting pads.

5. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 1, characterized by, The lubrication and heat dissipation assembly comprises: The oil baffle (16) arranged adjacent to the worm body (17) forms a flow guide edge along the circumference, and during operation, the oil is thrown to the worm and gear meshing area and the bearing area on both sides; The oil return channel arranged on the inner wall of the box (10) and / or the inner wall spiral flow guide rib, the channel guides the oil back to the oil pool at the bottom of the box from the meshing area and the bearing area; The vent plug (6) arranged on the upper part of the box (10) is used for balancing the pressure inside and outside the box (10) and inhibiting the oil mist from escaping due to temperature rise; The sight glass cover (7) arranged on the side wall of the box (10) at the normal oil level height is used for observing the oil level and oil quality in real time; The oil plug (20) arranged at the lowest point of the bottom of the box (10) is used for oil discharge and maintenance; The box (10) is integrally formed with heat dissipation reinforcing ribs and / or sheet-shaped heat dissipation surfaces on the outer surface; Wherein, the oil baffle (16), the oil return channel, the inner wall spiral flow guide rib, the vent plug (6), the sight glass cover (7) and the oil plug (20) jointly define a partition structure of an upper air chamber and a lower oil chamber in the space along the gravity direction, and during operation, the oil takes the friction heat of the tooth surface and the bearing to the box (10), and after heat dissipation by convection through the outer surface, the oil returns to the oil pool.

6. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 5, characterized by, The sealing assembly comprises: The non-contact sealing on the input side is formed by the cooperation of the cover (11) and the gasket (13), the gasket (13) is embedded between the cover (11) and the input shaft, and a multi-stage annular gap labyrinth channel is defined at the input end of the box (10), and a set gap is maintained between the rotating surface at the end of the input shaft and the cover (11); The contact sealing on the output side is formed by the double-lip oil seal (24) press-fitted in the stepped hole at the output end of the box (10) or the end hole of the cover (11), and the double-lip oil seal (24) is sealed with the polished running surface of the output shaft (26) on the oil chamber side; Wherein, the hole elastic stop ring (12) is respectively arranged at the end step of the input end and the output end of the box (10) to axially limit the oil seal or the end cover.

7. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 5, characterized by, The vent plug (6) is located on the upper surface of the housing (10) and is higher than the tooth tip circle of the worm gear body (9) in the vertical direction. The vent plug (6) is provided with an anti-oil return structure and a breathable one-way valve, and a replaceable oil mist collection core is provided in the ventilation path.

8. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 5, characterized by, The outer wall of the housing (10) facing the worm gear body (9) is provided with a thickened heat-conducting rib area. The inner side of the thickened heat-conducting rib area corresponds to the meshing area of ​​the worm gear body (9), and the outer side forms a sheet-like heat dissipation surface. The oil baffle ring (16) is set at a splash radius position that is larger than the pitch circle radius of the worm gear body (9), so that the splashed oil first covers the tooth surface of the worm body (17) and then falls back to the tooth surface of the worm gear body (9), so as to preferentially cool the high-heat area. The inner wall of the housing (10) forms a spiral guide rib along the axial direction of the worm body (17) that is consistent with the worm rotation direction, which is used to push the oil to the bearing areas at both ends.

9. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 2, characterized by, The worm gear body (17) adopts a hardened tooth surface structure with carburizing and quenching and fine grinding, the worm wheel body (9) adopts zinc-based alloy or aluminum bronze material, and the input driving gear (3) and the input driven gear (2) adopt helical gears with carburizing and quenching and grinding.

10. The high-efficiency heat-dissipation worm-gear helical gear reduction motor for light-load machinery according to claim 6, characterized by, A replaceable thin-walled bushing is provided at the output side seal as the running surface of the double-lip oil seal (24). The outer circle of the bushing forms multiple running areas that can be used in a staggered manner along the circumferential direction. During maintenance, the sealing surface can be updated by rotating or replacing the bushing. In addition, under different installation postures, the above-mentioned lubrication and sealing components still maintain the partitioned structure of the upper air chamber and the lower oil chamber to ensure stable oil level and low leakage.

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