Oil return sealing system and inclined transmission gearbox

Abstract

The invention provides an oil return sealing system and an inclined transmission gearbox, and relates to the technical field of gearboxes, the oil return sealing system comprises a gearbox body, an input shaft assembly, a sealing structure and an oil return structure, and the sealing structure is arranged between the gearbox body and an input shaft and seals a lower end shaft hole; an oil passing gap is formed between the sealing structure and the first input rolling bearing; the oil return structure comprises a first oil return channel and a second oil return channel which are arranged in the gearbox body, the first oil return channel is communicated with the bottom of an inner cavity of the gearbox body and the bottom of the oil passing gap, and one end of the second oil return channel is communicated with the bottom of the first oil return channel. The other end of the second oil return channel penetrates through the gearbox body and is used for being communicated with an external main oil return pipeline. Lubricating oil in the oil passing gap can be discharged in time through the oil return structure, the lubricating oil is prevented from being accumulated in the first input rolling bearing area, the temperature rise problem of the first input rolling bearing area is effectively solved, and it is ensured that the temperature is within a reasonable range.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to an oil return sealing system and a tilt transmission gearbox. Background Art

[0002] With the increasing requirements of high-speed bar production lines for two-phase zone thermomechanical rolling processes such as "low temperature finishing rolling" and "micro-alloying production", the demand for elongation changes has become more flexible. This has led to an increase in mill loads, which has promoted the continuous upgrading and updating of long high-speed zone mill models. In addition, the rolling process has put forward higher requirements for the flexibility of water-cooled water tanks and modular mill layouts. At the same time, the demand for controlled rolling and controlled cooling processes to improve the comprehensive mechanical properties of rolled products, as well as the demand of production enterprises to reduce alloy usage and costs, has become increasingly prominent.

[0003] With the upgrade of modular rolling mill models in bar production lines, the design of two-frame shared box (including the existing two-frame independent transmission and two-frame centralized transmission modular rolling mill transmission box and roller box) has become larger, which increases the difficulty of manufacturing, assembly, installation and equipment maintenance. In contrast, the modular rolling mill unit with single-frame independent transmission has a simpler transmission shaft system design, simple box structure, and flexible combination layout, which reduces the difficulty of manufacturing, assembly, installation and equipment maintenance. In addition, independent transmission can also realize empty frame shutdown, reduce energy consumption, and the transmission box can realize the interchange of left and right lines of the rolling line, and the whole line box interchange, reducing the spare parts inventory and maintenance of the production enterprise.

[0004] Among them, the gearbox in the single-frame oblique transmission module rolling mill unit is part of its core transmission device. The gearbox can adopt a dual-speed ratio gearbox design, which can output two speed ratios of speed increase and speed decrease to meet the input requirements of low speed and high speed and torque when rolling finished products of different specifications. This dual-speed ratio gearbox design helps to achieve a wider range of product specifications and improve the production efficiency, economy and reliability of the production line.

[0005] However, when the input speed of the gearbox is high, it needs to withstand a large torque and generate high heat, so forced lubrication and cooling must be used. Due to the large amount of lubricating oil, the sealing requirements of the gearbox are very high, and the existing sealing structure is difficult to meet the sealing needs of the tilted gearbox. In particular, when the gearbox is installed at a 45° tilt, the lubricating oil in the bearing on one side of the input shaft is gathered to the side of the coupling under the action of gravity. The traditional oil return and sealing structure is difficult to effectively discharge the oil stored in the low point, resulting in oil leakage problems at the bearing. In addition, iron chips will be deposited when the bearing is running, which may cause bearing burning. In addition, the normal flow of lubricating oil in the bearing is blocked, which will cause the temperature of the bearing area to rise, the oil film to become thinner, and the friction and wear will increase, thereby shortening the service life of the bearing. Therefore, how to prevent oil leakage and extend the service life of the tilted transmission gearbox has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an oil return sealing system and a tilt transmission gearbox for preventing oil leakage and prolonging the service life.

[0007] The above-mentioned object of the present invention can be achieved by adopting the following technical solutions. The present invention provides an oil return sealing system, comprising:

[0008] A gearbox housing arranged obliquely, wherein a lower end shaft hole is provided on the gearbox housing;

[0009] An input shaft assembly, the input shaft assembly comprising an input shaft inserted in the lower end shaft hole, an input gear structure arranged on the input shaft, and an input rolling bearing group arranged between the input shaft and the gearbox housing, the input rolling bearing group comprising a first input rolling bearing arranged between the input shaft and the lower end shaft hole;

[0010] A sealing structure, wherein the sealing structure is disposed between the gearbox housing and the input shaft and seals the lower end shaft hole, and an oil-passing gap is formed between the sealing structure and the first input rolling bearing;

[0011] An oil return structure, wherein the oil return structure includes a first oil return channel and a second oil return channel arranged in the gearbox case, the first oil return channel connecting the bottom of the inner cavity of the gearbox case and the bottom of the oil gap, one end of the second oil return channel connecting the bottom of the first oil return channel, and the other end of the second oil return channel passes through the gearbox case for connecting to an external main oil return pipeline.

[0012] In a preferred embodiment of the present invention, a first oil return groove and a second oil return groove are provided on the gearbox case, the first oil return groove is connected to the oil gap and extends downward along the gearbox case, the inner cavity of the first oil return groove forms the first oil return channel, the second oil return groove is connected to the bottom of the first oil return groove and passes through the gearbox case, and the inner cavity of the second oil return groove forms the second oil return channel.

[0013] In a preferred embodiment of the present invention, the first oil return groove is perpendicular to the input shaft, and the second oil return groove is parallel to the input shaft.

[0014] In a preferred embodiment of the present invention, the cross-section of the first oil return groove is rectangular or circular; and / or the cross-section of the second oil return groove is rectangular or circular.

[0015] In a preferred embodiment of the present invention, the sealing structure includes a bearing sleeve arranged on the gearbox housing, a spacer sleeve connected to the input shaft seal, an oil slinger ring sleeved on the spacer sleeve, and an oil return cover, the inner cavity of the bearing sleeve forms the lower end shaft hole, the oil slinger ring is placed between the spacer sleeve and the bearing sleeve, a first labyrinth sealing structure is provided between the oil slinger ring and the bearing sleeve, the oil return cover is connected to the bearing sleeve, at least part of the oil return cover is placed in the installation gap between the spacer sleeve and the oil slinger ring, a second labyrinth sealing structure is provided between the oil return cover and the oil slinger ring, the oil return cover includes an oil return chamber for connecting the first labyrinth sealing structure and the second labyrinth sealing structure, and an oil return port for connecting the oil return chamber and an external oil drain pipe.

[0016] In a preferred embodiment of the present invention, at least a portion of the oil return chamber is disposed below the first labyrinth sealing structure and the second labyrinth sealing structure, and the oil return port is connected to the bottom of the oil return chamber.

[0017] In a preferred embodiment of the present invention, the first labyrinth sealing structure includes a first labyrinth portion disposed on the oil slinger, and the first labyrinth portion is disposed facing the bearing sleeve.

[0018] In a preferred embodiment of the present invention, the first labyrinth portion includes a first labyrinth groove disposed facing the bearing sleeve.

[0019] In a preferred embodiment of the present invention, the oil return cover includes an inner ring portion and an outer ring portion that are spaced apart, the inner ring portion is inserted in the installation gap between the spacer sleeve and the oil slinger ring, and the outer ring portion is connected to the bearing sleeve; the second labyrinth sealing structure includes a second labyrinth portion arranged on the inner ring portion, and the second labyrinth portion is arranged facing the oil slinger ring.

[0020] In a preferred embodiment of the present invention, the second labyrinth portion includes a plurality of annular oil grooves spaced apart and facing the oil slinger.

[0021] In a preferred embodiment of the present invention, the oil return sealing system also includes an oil retaining structure arranged on the input shaft, and the oil retaining structure is arranged between the input gear structure and the first input rolling bearing. Along the axial direction of the input shaft, the projection area of ​​the oil retaining structure covers the first input rolling bearing.

[0022] In a preferred embodiment of the present invention, the oil baffle structure includes an oil baffle plate disposed on the input shaft.

[0023] The present invention also provides a tilt transmission gearbox, comprising the aforementioned oil return sealing system.

[0024] In a preferred embodiment of the present invention, the oil return sealing system comprises a gearbox housing arranged obliquely, and the gearbox housing is further provided with an upper end shaft hole;

[0025] The tilt transmission gearbox also includes an output shaft assembly, which includes an output shaft inserted in the upper end shaft hole, an output gear structure arranged on the output shaft, and an output rolling bearing group arranged between the output shaft and the gearbox housing, and the output gear structure is transmissionably meshed with the input gear structure of the oil return sealing system.

[0026] In a preferred embodiment of the present invention, the inclined transmission gearbox further comprises a shift mechanism, and the output gear structure and the input gear structure are transmissionably meshed through the shift mechanism.

[0027] In a preferred embodiment of the present invention, it further comprises a gearbox base, and the gearbox housing is tilted at a preset angle on the gearbox base.

[0028] The technical solution of the present invention has the following significant beneficial effects:

[0029] When the oil return sealing system of the present invention is used, the lower end shaft hole can be sealed through the sealing structure, ensuring the sealing reliability between the input shaft and the lower end shaft hole, so that the gearbox can operate stably under high speed and large inclination installation conditions, avoiding the problem of lubricating oil leakage.

[0030] Since the gearbox housing is tilted, the lubricating oil will gather to the side of the first input rolling bearing under the action of gravity and deposit in the oil gap between the sealing structure and the first input rolling bearing. In order to avoid the lubricating oil being deposited in the oil gap and affecting the operation effect of the gearbox. The present invention also provides an oil return structure on the gearbox housing. The oil return structure can effectively guide the lubricating oil to flow out of the oil gap through the first oil return channel and the second oil return channel, and finally return to the inner cavity of the gearbox housing or the external main oil return pipeline, so that the lubricating oil in the oil gap can be discharged in time, and the lubricating oil is prevented from accumulating in the first input rolling bearing area, which effectively solves the problem of temperature rise in the first input rolling bearing area caused by lubricating oil deposition, and ensures that the temperature of the first input rolling bearing is within a reasonable range.

[0031] Specifically, when the gearbox is not running, most of the pressure-free oil can flow from the first oil return channel to the inner cavity of the gearbox housing, thereby preventing lubricating oil and impurities from being retained in the first input rolling bearing area.

[0032] During the operation of the gearbox, due to the influence of factors such as speed, load, oil supply pressure, and oil supply temperature, although the actual movement trajectory of the splashing lubricating oil is different, the first oil return channel still plays a major diversion role, ensuring that the lubricating oil under different working conditions can be discharged smoothly, thereby ensuring the operating stability of the gearbox.

[0033] In addition, the oil return structure of the present invention is arranged on the gearbox housing, and its design is compact, which reduces the number and complexity of parts, and is conducive to reducing the difficulty of processing and manufacturing costs. In particular, for large-scale production of modular rolling mill units, this compact and simple structure helps to improve production efficiency and reduce the difficulty of manufacturing, assembly, installation and maintenance.

[0034] The present invention can ensure that the lubricating oil in the first input rolling bearing area is effectively sealed through the sealing structure, prevent the lubricating oil from leaking, and improve the sealing effect. In addition, the oil return structure can ensure that the first input rolling bearing area can be backflowed in time, avoiding the problem of lubricating oil deposition. Especially when the gearbox is at a high speed (above 2000rpm) and tilted installation, the present invention can effectively solve the problems of sealing and oil return in the first input rolling bearing area through the combination of the sealing structure and the oil return structure, and significantly improve the reliability and service life of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0037] Figure 1 A cross-sectional view of an embodiment of the oil return sealing system of the present invention;

[0038] Figure 2 It is a three-dimensional schematic diagram of an embodiment of the oil return structure of the present invention;

[0039] Figure 3 A cross-sectional view of an embodiment of the sealing structure of the present invention;

[0040] Figure 4 A side cross-sectional view of an embodiment of the oil slinger ring of the present invention;

[0041] Figure 5 A side cross-sectional view of an embodiment of the spacer sleeve of the present invention;

[0042] Figure 6 It is a side cross-sectional view of an embodiment of the oil return cover of the present invention.

[0043] Reference numerals in the above drawings:

[0044] 10. Gearbox;

[0045] 100, gearbox housing; 110, lower end shaft hole; 120, oil clearance;

[0046] 200, input shaft assembly; 210, input shaft; 220, input gear structure; 231, first input rolling bearing; 232, second input rolling bearing;

[0047] 300, sealing structure; 310, bearing sleeve; 320, spacer; 330, oil slinger; 331, first labyrinth; 340, oil return cover; 341, oil return chamber; 342, oil return port; 343, inner ring; 344, outer ring; 345, second labyrinth; 346, ring body; 347, inner hole;

[0048] 400, oil return structure; 410, first oil return channel; 420, second oil return channel;

[0049] 500, oil retaining structure;

[0050] 600, output shaft assembly;

[0051] 700. Gear shifting mechanism. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Implementation Method 1

[0054] Please refer to Figures 1 to 6 As shown, an oil return sealing system is provided in an embodiment of the present invention, which includes a gearbox housing 100, an input shaft assembly 200, a sealing structure 300 and an oil return structure 400 arranged obliquely, and a lower end shaft hole 110 is provided on the gearbox housing 100; the input shaft assembly 200 includes an input shaft 210 inserted in the lower end shaft hole 110, an input gear structure 220 arranged on the input shaft 210, and an input rolling bearing group arranged between the input shaft 210 and the gearbox housing 100, and the input rolling bearing group includes a first input rolling bearing arranged between the input shaft 210 and the lower end shaft hole 110 231; the sealing structure 300 is arranged between the gearbox case 100 and the input shaft 210 and seals the lower end shaft hole 110, and an oil gap 120 is formed between the sealing structure 300 and the first input rolling bearing 231; the oil return structure 400 includes a first oil return channel 410 and a second oil return channel 420 arranged in the gearbox case 100, the first oil return channel 410 connects the bottom of the inner cavity of the gearbox case 100 and the bottom of the oil gap 120, one end of the second oil return channel connects the bottom of the first oil return channel 410, and the other end of the second oil return channel 420 passes through the gearbox case 100 for connecting to an external main oil return pipeline.

[0055] On the whole, when the oil return sealing system is in use, the sealing structure 300 can seal the lower end shaft hole 110, ensuring the sealing reliability between the input shaft 210 and the lower end shaft hole 110, so that the gearbox 10 can operate stably under high speed and large inclination installation conditions, avoiding the problem of lubricating oil leakage.

[0056] The present invention aims to solve the problems of poor sealing effect, poor oil return, complex structure and poor heat dissipation in the existing sealing structure and oil return method under high speed (above 2000rpm), large torque transmission, high heat generation, forced thin oil lubrication and inclined installation conditions. Since the gearbox housing 100 is inclined, the lubricating oil will gather to the side of the first input rolling bearing 231 under the action of gravity and deposit in the oil gap 120 between the sealing structure 300 and the first input rolling bearing 231.

[0057] In order to prevent the lubricating oil from being deposited in the oil gap 120 and affecting the operation effect of the gearbox 10, the present invention further provides an oil return structure 400 on the gearbox housing 100. The oil return structure 400 can effectively guide the lubricating oil to flow out of the oil gap 120 through the first oil return channel 410 and the second oil return channel 420, and finally return to the inner cavity of the gearbox housing 100 or the external main oil return pipeline, so that the lubricating oil in the oil gap 120 can be discharged in time, and the lubricating oil is prevented from accumulating in the first input rolling bearing 231 area, which effectively solves the problem of temperature rise in the first input rolling bearing 231 area caused by lubricating oil deposition, and ensures that the temperature of the first input rolling bearing 231 is within a reasonable range.

[0058] Specifically, Figure 1 and Figure 2 In the illustrated embodiment, when the gearbox 10 is not in operation, most of the unpressurized oil can flow from the first oil return channel 410 to the inner cavity of the gearbox housing 100 , thereby preventing lubricating oil and impurities from being retained in the area where the first input rolling bearing 231 is located.

[0059] During the operation of the gearbox 10, due to the influence of factors such as speed, load, oil supply pressure, and oil supply temperature, although the actual movement trajectory of the splashing lubricating oil is different, the first oil return channel 410 still plays a major diversion role, ensuring that the lubricating oil under different working conditions can be discharged smoothly, thereby ensuring the operating stability of the gearbox 10.

[0060] In addition, the oil return structure 400 of the present invention is arranged on the gearbox housing 100, and its design is compact, which reduces the number and complexity of parts, and is conducive to reducing the difficulty of processing and manufacturing costs. In particular, for large-scale production of modular rolling mill units, this compact and simple structure helps to improve production efficiency and reduce the difficulty of manufacturing, assembly, installation and maintenance.

[0061] The present invention can ensure that the lubricating oil in the area of ​​the first input rolling bearing 231 is effectively sealed through the sealing structure 300, prevent the lubricating oil from leaking, and improve the sealing effect. In addition, the lubricating oil in the area of ​​the first input rolling bearing 231 can be promptly returned through the oil return structure 400, avoiding the problem of lubricating oil deposition.

[0062] Especially when the gearbox 10 is at a high speed (above 2000 rpm) and is installed at an angle, the present invention can effectively solve the sealing and oil return problems in the first input rolling bearing 231 area by cooperating with the sealing structure 300 and the oil return structure 400, thereby significantly improving the reliability and service life of the gearbox 10.

[0063] The designer can adjust the tilt installation angle of the gearbox housing 100 according to the use requirements, and no specific limitation is made here. For example, the gearbox housing 100 is installed at a tilt of 45°.

[0064] In an embodiment of the present invention, Figure 1 In the illustrated embodiment, the input rolling bearing assembly further includes a second input rolling bearing 232 disposed between the input shaft 210 and the gearbox housing 100. The first input rolling bearing 231 and the second input rolling bearing 232 improve the installation stability of the input shaft 210.

[0065] In an embodiment of the present invention, Figure 1 and Figure 2 In the embodiment shown, a first oil return groove and a second oil return groove are provided on the gearbox case 100. The first oil return groove is connected to the oil gap 120 and extends downward along the gearbox case 100. The inner cavity of the first oil return groove forms a first oil return channel 410. The second oil return groove is connected to the bottom of the first oil return groove and passes through the gearbox case 100. The inner cavity of the second oil return groove forms a second oil return channel 420.

[0066] The first oil return groove ensures that the lubricating oil can be quickly discharged from the area where the first input rolling bearing 231 is located, reducing the retention time of the lubricating oil in the area where the first input rolling bearing 231 is located, improving the circulation efficiency and enhancing the cooling effect. The second oil return groove ensures that the lubricating oil is smoothly returned and discharged, avoiding pressure increase and equipment failure caused by oil accumulation, and further improving the reliability and stability of the gearbox 10.

[0067] Moreover, the first oil return groove and the second oil return groove are both arranged in the gearbox housing 100, which has the advantage of compact layout, saves installation space, and does not increase the overall size of the gearbox 10. In addition, the first oil return groove and the second oil return groove are easy to process, which reduces the manufacturing difficulty and cost, is particularly suitable for large-scale production, improves production efficiency, and reduces manufacturing costs.

[0068] The designer can adjust the shape and structure of the first oil return groove and the second oil return groove according to the use requirements, and no specific restrictions are made here. Preferably, the first oil return groove is perpendicular to the input shaft 210, and the second oil return groove is parallel to the input shaft 210. By controlling the installation direction of the first oil return groove and the second oil return groove, the first oil return groove is parallel to the lower end cover of the gearbox housing 100, and the second oil return groove is perpendicular to the lower end cover of the gearbox housing 100, so that it is easy to process and manufacture, which helps to improve the processing speed and reduce the processing cost.

[0069] In an embodiment of the present invention, the cross section of the first oil return groove is rectangular or circular; and / or the cross section of the second oil return groove is rectangular or circular. Preferably, the cross section of the first oil return groove is rectangular; and the cross section of the second oil return groove is circular.

[0070] Of course, in other feasible embodiments, designers can adjust the cross-sectional shapes of the first oil return groove and the second oil return groove according to usage requirements, and no specific limitation is made here.

[0071] In an embodiment of the present invention, Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In the illustrated embodiment, the sealing structure 300 includes a bearing sleeve 310 disposed on the gearbox housing 100 , a spacer sleeve 320 sealed with the input shaft 210 , an oil slinger 330 sleeved on the spacer sleeve 320 , and an oil return cover 340 .

[0072] Specifically, the inner cavity of the bearing sleeve 310 forms a lower end shaft hole 110, the oil slinger 330 is placed between the spacer sleeve 320 and the bearing sleeve 310, a first labyrinth sealing structure is provided between the oil slinger 330 and the bearing sleeve 310, the oil return cover 340 is connected to the bearing sleeve 310, at least part of the oil return cover 340 is placed in the installation gap between the spacer sleeve 320 and the oil slinger 330, a second labyrinth sealing structure is provided between the oil return cover 340 and the oil slinger 330, and the oil return cover 340 includes an oil return chamber 341 for connecting the first labyrinth sealing structure and the second labyrinth sealing structure, and an oil return port 342 for connecting the oil return chamber 341 and the external oil drain pipe.

[0073] A double labyrinth seal is formed by the first labyrinth seal structure and the second labyrinth seal structure, thereby effectively preventing lubricating oil leakage. Especially at high speed (above 2000rpm) and inclined installation conditions, the labyrinth seal structure 300 can effectively prevent lubricating oil from flowing in the axial direction, ensuring the reliability of the seal. In addition, the first labyrinth seal structure and the second labyrinth seal structure can also prevent external large particles from entering the gearbox housing 100 and contaminating the lubricating oil.

[0074] The bearing sleeve 310 is fixedly arranged on the gearbox housing 100, and the oil slinger 330 is arranged on the input shaft 210 through the spacer sleeve 320, and the oil slinger 330 can rotate together with the input shaft 210. When the oil slinger 330 rotates at high speed with the input shaft 210, the excess lubricating oil is thrown out from the first labyrinth seal structure by centrifugal force, and at the same time, air flow is caused to produce a pumping effect, thereby preventing the leakage of lubricating oil.

[0075] In addition, the oil return port 342 may be connected to the bottom of the oil return chamber 341 , and the lubricating oil entering the first labyrinth seal structure 300 may be stored through the oil return chamber 341 and connected to an external oil return pipe through the oil return port 342 for discharge.

[0076] In an embodiment of the present invention, Figure 1 and Figure 3 In the illustrated embodiment, at least a portion of the oil return chamber 341 is disposed below the first labyrinth seal structure and the second labyrinth seal structure, and the oil return port 342 is connected to the bottom of the oil return chamber 341 .

[0077] By locating at least part of the oil return chamber 341 below the first labyrinth sealing structure and the second labyrinth sealing structure, it is ensured that the lubricating oil thrown out or leaked from the two labyrinth sealing structures can be quickly collected in the oil return chamber 341 at the bottom and discharged along the oil return port 342.

[0078] The oil return chamber 341 makes full use of gravity through low-level collection, reducing the retention time of the lubricating oil in the sealing area. In addition, the time of the lubricating oil in the sealing area is shortened, which also reduces the impact of the high-temperature area on the lubricating oil, thereby reducing the temperature rise of the bearings and other key components, improving the cooling effect, and extending the service life of the equipment.

[0079] In an embodiment of the present invention, the first labyrinth seal structure includes a first labyrinth portion 331 disposed on the oil slinger 330 , and the first labyrinth portion 331 is disposed facing the bearing sleeve 310 .

[0080] The designer may adjust the specific shape and structure of the first labyrinth portion 331 according to the use requirements, and no specific limitation is made here. Preferably, the first labyrinth portion 331 includes a first labyrinth groove arranged facing the bearing sleeve 310 .

[0081] More preferably, Figure 4 In the embodiment shown, the first labyrinth groove is a U-shaped groove, wherein the cross section of the U-shaped groove can be symmetrically arranged or asymmetrically arranged.

[0082] In a feasible embodiment, the cross section of the U-shaped groove is asymmetrically arranged. Specifically, the two curved surfaces are connected to form the two side walls of the U-shaped groove, and the two curved surfaces are respectively arranged with a first curvature and a second curvature. The designer can adjust the specific curvature of the two curved surfaces according to the use requirements, and no specific limitation is made here.

[0083] The U-shaped groove makes it easier for the lubricating oil to form a stable oil film when rotating at high speed, thereby improving the sealing effect. In addition, the opening direction of the U-shaped groove faces the bearing sleeve 310. When the U-shaped groove rotates at high speed, the excess lubricating oil is thrown out from the first labyrinth seal structure formed by the U-shaped groove by centrifugal force, and at the same time, air flow is caused to generate a pumping effect, thereby preventing the leakage of thin oil lubricating oil.

[0084] In an embodiment of the present invention, Figure 4 In the illustrated embodiment, the oil slinger 330 is generally cylindrical in shape, and the inner hole 347 of the oil slinger 330 and the spacer 320 are interference fit.

[0085] In an embodiment of the present invention, Figure 6 In the illustrated embodiment, the oil return cover 340 includes an inner ring portion 343 and an outer ring portion 344 that are spaced apart, the inner ring portion 343 is inserted in the installation gap between the spacer sleeve 320 and the oil slinger 330, and the outer ring portion 344 is connected to the bearing sleeve 310; the second labyrinth sealing structure includes a second labyrinth portion 345 arranged on the inner ring portion 343, and the second labyrinth portion 345 is arranged facing the oil slinger 330.

[0086] Specifically, the outer ring portion 344 includes a ring body 346, at least part of which is extended toward the inner ring portion 343, thereby forming an inner hole 347 between the inner ring portion 343 and the ring body 346, and the oil slinger 330 can be inserted into the inner hole 347. The ring body 346 and the outer ring portion 344 may be integrally or separately arranged, which is not specifically limited here.

[0087] The designer may adjust the specific shape and structure of the second labyrinth portion 345 according to the use requirements, and no specific limitation is imposed here. Preferably, the second labyrinth portion 345 includes a plurality of annular oil grooves spaced apart and facing the oil slinger 330. More preferably, the cross section of the annular oil groove is U-shaped.

[0088] By setting up multiple annular oil grooves, multiple barriers are formed, which increase the resistance to the flow of lubricating oil and effectively prevent the lubricating oil from flowing in the axial direction, ensuring a better sealing effect. Especially at high speeds (above 2000rpm) and inclined installation conditions, the risk of lubricating oil leakage can be significantly reduced.

[0089] When the input gear structure 220 in the gearbox housing 100 rotates at high speed, the lubricating oil will splash, thereby increasing the amount of lubricating oil at the first input rolling bearing 231, resulting in an increased risk of lubricating oil leakage. The output gear structure will also cause lubricating oil to splash, which will not be described in detail here.

[0090] In order to avoid the above problems, Figure 1 In the embodiment shown, in an embodiment of the present invention, the oil return sealing system also includes an oil retaining structure 500 arranged on the input shaft 210, and the oil retaining structure 500 is arranged between the input gear structure 220 and the first input rolling bearing 231. Along the axial direction of the input shaft 210, the projection area of ​​the oil retaining structure 500 covers the first input rolling bearing 231.

[0091] By arranging the oil blocking structure 500 between the first input rolling bearing 231 and the input gear structure 220, the splashing oil generated by most gears can be effectively blocked, reducing the amount of lubricating oil splashing to the first input rolling bearing 231, thereby reducing the risk of lubricating oil leakage.

[0092] Designers can adjust the specific structure of the oil baffle structure 500 according to usage requirements, and no specific limitation is made herein. Preferably, the oil baffle structure 500 includes an oil baffle plate disposed on the input shaft 210 .

[0093] By making the projection area of ​​the oil baffle plate completely cover the first input rolling bearing 231, it is ensured that the lubricating oil thrown out from the input gear structure 220 will not directly contact the first input rolling bearing 231, thereby effectively preventing the leakage of the lubricating oil. In addition, when the oil baffle plate rotates, the lubricating oil can form a stable oil film on the oil baffle plate, and when rotating at high speed, it is thrown out and evenly distributed on the input shaft 210 and related components, ensuring that key components are fully lubricated and reducing the friction and wear of components.

[0094] Implementation Method 2

[0095] Please refer to Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a tilt transmission gearbox 10 includes the oil return sealing system described in Embodiment 1. The specific structure, working principle and beneficial effects of the oil return sealing system are the same as those described in Embodiment 1, and will not be repeated here.

[0096] In an embodiment of the present invention, the oil return sealing system includes an inclined gearbox housing 100, which is also provided with an upper end shaft hole; the inclined transmission gearbox 10 also includes an output shaft assembly 600, the output shaft assembly 600 includes an output shaft plugged into the upper end shaft hole, an output gear structure arranged on the output shaft, and an output rolling bearing group arranged between the output shaft and the gearbox housing 100, and the output gear structure is transmissionably meshed with the input gear structure 220 of the oil return sealing system.

[0097] The tilted gearbox case 100 allows the lubricating oil to naturally flow to a lower position under the action of gravity, forming a more stable oil film, ensuring that key components such as the rolling bearing group and the gear structure are fully lubricated, reducing friction and wear.

[0098] Furthermore, the output gear structure cooperates with the input gear structure 220, making the transmission more stable, reducing energy loss, and improving the overall transmission efficiency. The designer can adjust the specific structure of the output gear structure and the input gear structure 220 according to the use requirements, and no specific limitation is made here.

[0099] In the embodiment of the present invention, the tilt transmission gearbox 10 further includes a shift mechanism 700, and the output gear structure and the input gear structure 220 are drivably meshed through the shift mechanism 700. Designers can adjust the specific structure of the shift mechanism 700 according to usage requirements, and no specific limitation is made here.

[0100] The gearbox 10 can select a suitable transmission ratio according to different working conditions through the shift mechanism 700, thereby improving the flexibility and adaptability of the system. The user can make adjustments according to the actual application scenario (such as load changes, speed requirements, etc.) to ensure that the gearbox 10 is always in the best working state.

[0101] In the embodiment of the present invention, a gearbox 10 base is also included, and a gearbox housing 100 is tilted at a preset angle on the gearbox 10 base. The gearbox 10 base and the gearbox housing 100 cooperate with each other, so that the tilt angle of the gearbox housing 100 can be controlled. The designer can adjust the specific structure of the gearbox housing 100 according to the use requirements, and no specific limitation is made here.

[0102] In an embodiment of the present invention, the gearbox 10 is a thin oil centralized lubrication, and the internal oil supply circuit design is mainly divided into the following three categories: the first category: bearing oil supply, including input rolling bearing group and output rolling bearing group oil supply. The purpose is to ensure that the bearing can form a sufficient oil film thickness under high load, high speed and high temperature environment to reduce the friction and wear between metals. Another purpose is to take away the heat generated by the friction between the bearing rolling elements and the inner and outer rings and the retaining bracket, and reduce the temperature rise of the bearing. The second category: gear meshing oil spray, take away the heat generated by the gear meshing rolling and sliding friction, form an oil film, reduce tooth surface wear, ensure normal meshing, and extend the service life of the gear. The third category: supply oil to the splines of the shifting mechanism 700 to form an oil film, reduce spline tooth surface wear, ensure normal meshing, and extend the service life of the splines.

[0103] In addition, by tilting the gearbox 10, the bearing lubricating oil on one side of the input shaft 210 is collected to the coupling side under the action of gravity. If the traditional oil return and sealing structure 300 is used, the oil stored at the low point cannot be discharged, and the following problems exist: 1. Iron filings generated by the friction between the rolling element, the cage and the inner and outer rings of the bearing are easily deposited at the low point, and the oil stirring during the operation of the bearing causes the bearing to burn; 2. The normal flow of lubricating oil in the bearing is the key to ensure its good lubrication and cooling. Thin oil lubrication cannot circulate effectively, which will increase the bearing temperature and thin the oil film, thereby increasing friction and wear and shortening the service life of the bearing. In addition, when the gearbox 10 is tilted, the gear lubricating oil will flow to the side of the first input rolling bearing 231 under the action of gravity, and the lubricating oil thrown to the side wall of the gearbox housing 100 by centrifugal force will also flow back to the inside of the first input rolling bearing 231 under the action of gravity, increasing the risk of oil leakage.

[0104] The present invention designs a new sealing structure 300 and an oil return structure 400 for the gearbox 10, takes both sealing and oil drainage into consideration, and fully considers the blocking and oil return of the bearing oil supply and the gear oil supply under different working conditions. The present invention has a compact structure and low difficulty in parts processing, and can meet the requirements of high input speed (above 2000rpm) and 45° inclined installation, solves the problems of high input speed and large inclination installation of the gearbox 10, reduces the impact of frequent replacement of transmission sealing ring wearing parts, and improves the production efficiency of the production line.

[0105] Among them, the gearbox 10, as an important component of the modular rolling mill unit with a single frame and independent transmission, can realize a simpler design and a more flexible layout of the unit's transmission shaft system, reduce the difficulty of manufacturing, assembly, installation and equipment maintenance of production enterprises, save production line investment costs for enterprises, and improve profit margins.

[0106] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0107] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An oil return sealing system, characterized in that: include: A gearbox housing arranged obliquely, wherein a lower end shaft hole is provided on the gearbox housing; An input shaft assembly, the input shaft assembly comprising an input shaft inserted in the lower end shaft hole, an input gear structure arranged on the input shaft, and an input rolling bearing group arranged between the input shaft and the gearbox housing, the input rolling bearing group comprising a first input rolling bearing arranged between the input shaft and the lower end shaft hole; A sealing structure, wherein the sealing structure is disposed between the gearbox housing and the input shaft and seals the lower end shaft hole, and an oil-passing gap is formed between the sealing structure and the first input rolling bearing; An oil return structure, wherein the oil return structure includes a first oil return channel and a second oil return channel arranged in the gearbox case, the first oil return channel connecting the bottom of the inner cavity of the gearbox case and the bottom of the oil gap, one end of the second oil return channel connecting the bottom of the first oil return channel, and the other end of the second oil return channel passes through the gearbox case for connecting to an external main oil return pipeline.

2. The oil return sealing system according to claim 1, characterized in that: The gearbox case is provided with a first oil return groove and a second oil return groove, the first oil return groove is connected to the oil gap and extends downward along the gearbox case, the inner cavity of the first oil return groove forms the first oil return channel, the second oil return groove is connected to the bottom of the first oil return groove and passes through the gearbox case, and the inner cavity of the second oil return groove forms the second oil return channel.

3. The oil return sealing system according to claim 2, characterized in that: The first oil return groove is perpendicular to the input shaft, and the second oil return groove is parallel to the input shaft.

4. The oil return sealing system according to claim 2, characterized in that: The cross section of the first oil return groove is rectangular or circular; and / or the cross section of the second oil return groove is rectangular or circular.

5. The oil return sealing system according to claim 1, characterized in that: The sealing structure includes a bearing sleeve arranged on the gearbox housing, a spacer sleeve sealed with the input shaft, an oil slinger ring sleeved on the spacer sleeve, and an oil return cover, the inner cavity of the bearing sleeve forms the lower end shaft hole, the oil slinger ring is placed between the spacer sleeve and the bearing sleeve, a first labyrinth sealing structure is provided between the oil slinger ring and the bearing sleeve, the oil return cover is connected to the bearing sleeve, at least part of the oil return cover is placed in the installation gap between the spacer sleeve and the oil slinger ring, a second labyrinth sealing structure is provided between the oil return cover and the oil slinger ring, the oil return cover includes an oil return chamber for connecting the first labyrinth sealing structure and the second labyrinth sealing structure, and an oil return port for connecting the oil return chamber and an external oil drain pipe.

6. The oil return sealing system according to claim 5, characterized in that: At least a portion of the oil return chamber is disposed below the first labyrinth sealing structure and the second labyrinth sealing structure, and the oil return port is connected to the bottom of the oil return chamber.

7. The oil return sealing system according to claim 5, characterized in that: The first labyrinth sealing structure includes a first labyrinth portion disposed on the oil slinger, and the first labyrinth portion is disposed facing the bearing sleeve.

8. The oil return seal system according to claim 7, characterized in that: The first labyrinth portion includes a first labyrinth groove disposed facing the bearing sleeve.

9. The oil return sealing system according to claim 5, characterized in that: The oil return cover includes an inner ring portion and an outer ring portion which are arranged at intervals, the inner ring portion is inserted in the installation gap between the spacer sleeve and the oil slinger ring, and the outer ring portion is connected to the bearing sleeve; the second labyrinth sealing structure includes a second labyrinth portion arranged on the inner ring portion, and the second labyrinth portion is arranged facing the oil slinger ring.

10. The oil return seal system according to claim 9, characterized in that: The second labyrinth portion includes a plurality of annular oil grooves arranged at intervals facing the oil slinger.

11. The oil return seal system according to claim 1, characterized in that: The oil return sealing system also includes an oil retaining structure arranged on the input shaft, and the oil retaining structure is arranged between the input gear structure and the first input rolling bearing. Along the axial direction of the input shaft, the projection area of ​​the oil retaining structure covers the first input rolling bearing.

12. The oil return seal system according to claim 11, characterized in that: The oil baffle structure includes an oil baffle plate arranged on the input shaft.

13. A tilt transmission gearbox, characterized in that: The invention comprises the oil return seal system as claimed in any one of claims 1 to 12.

14. The tilt drive gearbox according to claim 13, wherein: The oil return sealing system comprises a gearbox housing arranged obliquely, and the gearbox housing is also provided with an upper end shaft hole; The tilt transmission gearbox also includes an output shaft assembly, which includes an output shaft inserted in the upper end shaft hole, an output gear structure arranged on the output shaft, and an output rolling bearing group arranged between the output shaft and the gearbox housing, and the output gear structure is transmissionably meshed with the input gear structure of the oil return sealing system.

15. The tilt drive gearbox of claim 14, wherein: The tilt transmission gearbox further comprises a shift mechanism, through which the output gear structure is drivably meshed with the input gear structure.

16. The tilt drive gearbox of claim 14, wherein: It also includes a gearbox base, and the gearbox case is tilted at a preset angle on the gearbox base.

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