Reduction gearbox body and reduction gearbox for fracturing equipment

Abstract

The utility model provides a reduction gearbox body which comprises a parallel-stage side box body, a middle box body and a planetary-stage side box body, so that a parallel-stage box body space and a planetary-stage box body space are formed. The intermediate case includes: a planetary end plate extending in a direction perpendicular to the axial direction; a side coaming extending in the axial direction from the edge portion of the planetary-stage end panel and joined to the parallel-stage side box; the planetary-level joint part protrudes from the planetary-level end panel to the planetary-level side box body and is jointed with the planetary-level side box body, one part of the planetary-level end panel is located on the inner side of the planetary-level joint part and divides the space of the planetary-level box body and the space of the parallel-level box body, and the part of the planetary-level end panel is provided with an oil baffle plate and a hollow part; the parallel-level box body space and the planetary-level box body space are in fluid communication through the hollow-out part, and the minimum height of the oil baffle plate extending upwards in the vertical direction from the lowest point of the inner side of the planetary-level joint part is larger than or equal to the liquid level height of lubricating oil needing to be kept in the planetary-level box body space.

Description

Technical Field

[0001] The present disclosure relates to the field of fracturing equipment, and more specifically, to a reduction gearbox used in conjunction with the fracturing equipment, and more specifically, to a reduction gearbox housing capable of achieving both better lubrication effect and smaller agitation power loss, and a reduction gearbox having such a reduction gearbox housing. Background Art

[0002] In recent years, with the large-scale exploration and development of oil, natural gas, shale gas, etc., fracturing equipment has received more and more attention in the field of oil and gas extraction. The reduction box is the transmission system of the entire fracturing equipment. Its function is to convert the power output by the prime mover (including internal combustion engine, motor, turbine engine, etc.) through the different speed ratio changes of the gears inside the reduction box, so as to achieve the effect of speed reduction and torque increase or speed increase and torque reduction, providing different transmission capabilities for fracturing equipment.

[0003] Generally speaking, the commonly used fracturing reduction gearbox assemblies in this field have two structural forms: single parallel stage (1P) and parallel + planetary double stage (2P), and have a speed ratio in the range of 5:1 to 15:1. The 1P structure can be used for the reduction gearbox with a lower speed. The 1P structure is relatively simple, so there are fewer lubrication points that need to be lubricated. In this case, only forced lubrication can be used. The forced lubrication method arranges a dedicated lubrication oil circuit inside the reduction gearbox to guide the lubricating oil to the friction pair surface that needs to be lubricated, and only lubricates the lubrication points. For medium and high speed reduction gearboxes, a 2P structure can be selected. The 2P structure has a two-stage gear system of parallel stage gears and planetary stage gears, so the structure is relatively complex. In particular, the planetary stage side of the 2P structure is only lubricated by forced lubrication, and it is difficult to fully lubricate all the lubrication points that need to be lubricated in the limited space inside the reduction gearbox. Therefore, a mixed lubrication method combining splash (oil immersion) lubrication and forced lubrication is usually selected accordingly.

[0004] Regarding splash (oil immersion) lubrication, the common method at present is to use part of the space in the reduction gearbox as an oil storage chamber, so that a certain level of oil is stored at the bottom. The outer edge of the gear and / or bearing below is immersed in the oil storage under working conditions, and the oil storage at the bottom is splashed by high-speed rotation, so that the gear and other parts are lubricated and cooled by the oil storage at the bottom and the splashed oil to make up for the lack of forced lubricating oil.

[0005] However, the existing 2P structure reduction gearbox housing is formed by welding. Inside the housing, the space on the parallel stage side and the space on the planetary stage side are directly connected. Therefore, it is difficult to achieve splash (oil immersion) lubrication only for the friction pair on the planetary stage side. In addition, it is difficult to form a stable and effective structure inside the housing to control the oil storage level by welding. If the oil storage level is too low, it will not provide sufficient cooling effect; if the oil storage level is too high, the gear will increase the viscous resistance to overcome the lubricating oil, and also increase the pumping effect of the gear meshing on the lubricating oil, resulting in additional stirring power loss. Utility Model Content

[0006] Technical issues to be solved

[0007] In view of the above problems, the present disclosure aims to provide a reduction gearbox housing and a reduction gearbox having such a reduction gearbox housing, so that splash lubrication can be performed only on the friction pair on the planetary stage side, and the oil storage level on the planetary stage side of the housing can be better controlled, so as to achieve both better lubrication effect and smaller stirring power loss.

[0008] Technical Solution

[0009] In order to achieve the above-mentioned object, one aspect of the present disclosure provides a reduction gearbox housing, which includes a parallel-stage side housing, an intermediate housing, and a planetary-stage side housing, wherein the parallel-stage side housing and the intermediate housing form a parallel-stage housing space for accommodating a parallel-stage reduction mechanism, and the planetary-stage side housing and the intermediate housing form a planetary-stage housing space for accommodating a planetary-stage reduction mechanism. The intermediate housing includes: a planetary-stage end panel, which extends in a direction perpendicular to the axial direction of the parallel-stage reduction mechanism; a side panel, which extends from an edge of the planetary-stage end panel along the axial direction of the parallel-stage reduction mechanism toward the parallel-stage side housing and is engaged with the parallel-stage side housing; and a planetary-stage joint, which protrudes from the planetary-stage end panel toward the planetary-stage side housing and is engaged with the planetary-stage side housing. A portion of the planetary end panel is located inside the planetary joint and separates the planetary case space and the planetary case space, and the portion of the planetary end panel is provided with an oil baffle and a hollow portion, the parallel-stage case space is fluidly connected to the planetary case space via the hollow portion, and in the working state of the reduction gearbox case, the minimum height of the oil baffle extending upward in the vertical direction from the lowest point inside the planetary joint is greater than or equal to the liquid level height of the lubricating oil for splash lubrication that needs to be maintained in the planetary case space.

[0010] Preferably, at least one oil drain hole may be formed on the oil baffle plate, and the oil drain hole penetrates the oil baffle plate in the axial direction.

[0011] Preferably, the portion of the planetary end panel may also be formed with a bearing seat, a plurality of radial reinforcing ribs and at least one circumferential reinforcing rib, the bearing seat being located at the center of the portion, the plurality of radial reinforcing ribs being formed along the radial direction of the planetary joint and connecting the bearing seat with the peripheral portion of the portion close to the planetary joint, and the circumferential reinforcing ribs being formed along the circumferential direction of the planetary joint and including a plurality of arc segments connected between two adjacent radial reinforcing ribs.

[0012] Preferably, the oil baffle plates may be formed in a region surrounded by the adjacent radial reinforcing ribs, the circumferential reinforcing ribs and the peripheral edge portion, and each of the oil baffle plates has a sector shape.

[0013] Preferably, the hollow portion may be formed in a region surrounded by the adjacent radial reinforcement ribs, the circumferential reinforcement ribs and the bearing seat, and each of the hollow portions has a sector shape.

[0014] Preferably, the oil baffle plate may also be formed in a region surrounded by the adjacent radial reinforcement ribs, the circumferential reinforcement ribs and the bearing seat.

[0015] Preferably, the planetary stage side housing comprises: an inner gear ring housing, one end of which is joined to the planetary stage joint portion; and an output side housing, which is joined to the other end of the inner gear ring housing.

[0016] Preferably, the parallel stage side housing, the intermediate housing, the inner gear ring housing and the output side housing are respectively integrally formed.

[0017] Preferably, the portion is provided with a plurality of oil baffles and a plurality of hollow portions, and the plurality of oil baffles have different shapes.

[0018] Preferably, the diameter of the oil drain hole may be 1-100 mm, and the total area of ​​each of the oil drain holes accounts for less than 5% of the total area of ​​the portion of the planetary end plate located inside the planetary joint.

[0019] Preferably, the minimum height of the oil baffle plate may be set so that the liquid level height is maintained in a range of 1 / 8 to 1 / 2 of the radius of the planetary-stage joint.

[0020] According to another aspect of the present disclosure, a reduction gear box for fracturing equipment is provided, the reduction gear box comprising a planetary-stage reduction mechanism, a parallel-stage reduction mechanism, an input flange, an output gear shaft and a reduction gear box body as described above, the planetary-stage reduction mechanism and the parallel-stage reduction mechanism are installed in the reduction gear box body, one end of the input flange is connected to the input gear shaft of the parallel-stage reduction mechanism, the other end of the input flange is used to be connected to a power source, one end of the output gear shaft is connected to the output terminal of the planetary-stage reduction mechanism, and the other end of the output gear shaft is used to be connected to the crankshaft input end in the crankcase of the fracturing equipment.

[0021] Beneficial Effects

[0022] According to the reduction gearbox housing formed by an integral molding method and the reduction gearbox having such a reduction gearbox housing, an oil baffle plate and an oil drain hole are formed at appropriate positions of the intermediate housing, so that the lubricating oil used for splash lubrication is retained in the space on the planetary stage side of the reduction gearbox housing during operation, thereby only splash lubrication is performed on the friction pair on the planetary stage side. In addition, by adjusting the setting parameters of the oil baffle plate and the oil drain hole, the oil storage level on the planetary stage side of the housing can be controlled according to design requirements, so that better lubrication effect and smaller stirring power loss can be taken into account.

[0023] The beneficial effects of the reduction gearbox housing and the reduction gearbox according to the present disclosure are not limited to the above-mentioned beneficial effects, but may be any beneficial effects described herein and any beneficial effects that can be obtained by the structural features described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification which constitute a part of this application are used to provide a further understanding of the utility model. The schematic embodiments of the utility model shown in the drawings and their descriptions are only used to explain the technical solution of the utility model and do not constitute an improper limitation of the utility model. In the drawings:

[0025] Figure 1 is a schematic diagram illustrating main components of a transmission structure of a 2P reduction gearbox according to an embodiment of the present disclosure;

[0026] Figure 2A and Figure 2B Schematic diagrams showing the structure of a reduction gearbox housing of a 2P reduction gearbox according to an embodiment of the present disclosure from different angles;

[0027] Figure 3 is a front view illustrating a structural example of an intermediate case of a reduction gearbox according to an embodiment of the present disclosure;

[0028] Figure 4 is a partial perspective cross-sectional view illustrating a structural example of an intermediate case of a reduction gearbox according to an embodiment of the present disclosure;

[0029] Figure 5 is a side sectional view illustrating a structural example of an intermediate case of a reduction gearbox according to an embodiment of the present disclosure;

[0030] Figure 6 1 is a front view illustrating a structural example of an intermediate case of a reduction gear box according to a modified example of the present disclosure. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present disclosure more clear, the present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that in the following detailed description and claims, the use of expressions such as "approximately" and "approximately" is to take into account factors such as manufacturing tolerances and processing accuracy that are understood by ordinary technicians in the field, and will not lead to ambiguity in the description and unclear scope of protection. In addition, the directions such as "upper", "lower", "left", and "right" that appear in this article are only for the convenience of explanation and are defined in combination with the directions shown in the drawings or the common installation or working conditions of the device. After reading this article, ordinary technicians in this field can obviously easily know the direction corresponding to the direction described in this article when the device presents an orientation inconsistent with the orientation described in this article due to flipping or movement.

[0033] Below, the description will be given in the following order.

[0034] 1. Overview of the reduction gearbox housing and reduction gearbox according to the present disclosure

[0035] 2. Specific implementation of the intermediate housing of the reduction gearbox according to the embodiment of the present disclosure

[0036] 3. Modification of the reduction gearbox housing according to the embodiment of the present disclosure

[0037] In order to highlight the technical focus of the present disclosure and simplify the description, in the following, the same or similar components in each embodiment and modification will be marked with the same figure marks and no repeated description will be given.

[0038] 1. Overview of the reduction gearbox housing and reduction gearbox according to the present disclosure

[0039] The present disclosure provides a reduction gearbox housing for a reduction gearbox of a fracturing device and a reduction gearbox having such a housing. The reduction gearbox involved in the present disclosure is a reduction gearbox for a medium and high speed power source having a two-stage structure of a parallel stage and a planetary stage (hereinafter referred to as a 2P reduction gearbox).

[0040] Figure 1 FIG. 2 is a schematic diagram of the main components of the transmission structure of the 2P reduction box according to the present disclosure. Figure 1 As shown in the figure, the transmission structure of the 2P reduction box mainly includes a planetary stage reduction mechanism 10, a parallel stage reduction mechanism 20, an input flange 30 and an output gear shaft 40. The planetary stage reduction mechanism 10 and the parallel stage reduction mechanism 20 are installed in the reduction box housing to be described in detail below, and are supported by the reduction box housing and the bearing assembly. The input flange 30 is connected to the gear shaft of the input pinion 21 of the parallel stage reduction mechanism 20. The power source is connected to the input flange 30 to input torque and speed into the transmission structure of the 2P reduction box. The input pinion 21 of the parallel stage reduction mechanism 20 is meshed with the output gear 22 for transmission. The output gear 22 of the parallel stage reduction mechanism 20 is connected to the sun gear (not shown in the figure) of the planetary stage reduction mechanism 10 through a drum gear, and the sun gear is meshed with N (N≥2) planetary gears 11, and the planetary gears 11 are meshed with the fixed inner gear ring housing 400 to be described below. All the planetary gears 11 are mounted on the planet carrier 12 through the planetary gear shaft. The planetary gear 11 revolves around the sun gear, thereby driving the planet carrier 12 to rotate. The planet carrier 12, which is the output terminal of the planetary stage reduction mechanism, is connected to the output gear shaft 40. As shown in the figure, the output gear shaft 40 is formed with transmission teeth such as drum teeth to mesh and connect to the crankshaft input spline in the crankcase of the fracturing equipment, and output the speed and torque adjusted by the reduction box to the crankshaft of the fracturing equipment. The transmission structure of such a 2P reduction box is suitable for working conditions with large torque output.

[0041] Figure 2A and Figure 2B The schematic diagram of the assembly of the reduction gearbox housing of the 2P reduction gearbox according to the present disclosure is shown from different angles, wherein the transmission structure of the 2P reduction gearbox mentioned above has been installed in the reduction gearbox housing supporting it. Figure 2A and Figure 2BIt can be seen that the reduction gearbox housing according to the present disclosure includes an intermediate housing 100, an output side housing 200, an input side housing 300 and an inner gear ring housing 400. The input side housing 300 is fixedly connected to the input side of the intermediate housing 100 at its radial peripheral portion by means of fastening bolts or the like. The output side of the intermediate housing 100 is fixedly connected to the input side of the inner gear ring housing 400 at the radial peripheral portion of the intermediate housing 100 by means of fastening bolts or the like. The output side of the inner gear ring housing 400 is fixedly connected to the radial peripheral portion of the output side housing 200 by means of fastening bolts or the like. The intermediate housing 100, the output side housing 200, the input side housing 300 and the inner gear ring housing 400 are respectively integrally formed components by casting, 3D printing and the like. By comparison Figure 1 and Figure 2A and Figure 2B It can be seen that the parallel stage reduction mechanism 20 is located in the parallel stage case space surrounded by the intermediate case 100 and the input side case 300, and the planetary stage reduction mechanism 10 is located in the planetary stage case space surrounded by the intermediate case 100, the inner gear case 400 and the output side case 200. In other words, in the axial direction of the 2P reduction box (i.e., along the extension direction of the gear shaft of the 2P reduction box), the interface between the planetary stage reduction mechanism 10 and the parallel stage reduction mechanism 20 is located in the intermediate case 100, and the planetary stage case space and the planetary stage case space are separated by the planetary stage end panel 120 to be described below. Therefore, the input side case 300 can also be called the parallel stage side case 300, and the inner gear case 400 and the output side case 200 can also be collectively called the planetary stage side case 500.

[0042] Since the intermediate case 100 according to the present disclosure is formed in one piece by casting, during the manufacturing process, in the process of forming components such as reinforcing ribs inside, components such as oil baffles, hollow portions and oil drain holes for adjusting the liquid level of the stored oil for splash lubrication of the planetary-stage reduction mechanism 10 can be generated. As a result, when the reduction gearbox according to the present disclosure is in a working state, the stored oil for splash lubrication is mainly retained in the planetary-stage case space between the intermediate case 100 and the output-side case 200 due to the obstruction of the oil baffle plate. When the liquid level of the stored oil exceeds the height of the oil baffle plate due to excessive oil volume or agitation of the planetary-stage reduction mechanism 10, the oil will mainly overflow through the hollow portion into the parallel-stage case space between the intermediate case 100 and the input-side case 300.

[0043] Hereinafter, a specific embodiment of the intermediate case 100 of the reduction gearbox according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0044] 2. Specific implementation of the intermediate housing of the reduction gearbox according to the embodiment of the present disclosure

[0045] Figures 3 to 51 is a schematic structural diagram illustrating a specific embodiment of the intermediate housing 100 of the reduction gearbox according to the present disclosure. Figure 3 is a front view illustrating a structural example of an intermediate case 100 of a reduction gearbox according to the present disclosure, Figure 4 is a perspective partial cross-sectional view illustrating a structural example of an intermediate case 100 of a reduction gearbox according to the present disclosure, Figure 5 is a cross-sectional view illustrating a structural example of an intermediate case 100 of a reduction gearbox according to the present disclosure.

[0046] like Figure 3 and Figure 4 As shown, the intermediate housing 100 is composed of a side panel 110, a planetary end panel 120, and a planetary joint 130. The side panel 110 is formed around the gear end faces of the input pinion 21 and the output gear 22 in the parallel stage reduction mechanism 20, and extends in the axial direction of the reduction box. The width of the side panel 110 extending in the axial direction is roughly determined by the axial length of the gear shaft of the output gear 22 in the parallel stage reduction mechanism 20. In other words, the shape and size of the intermediate housing 100 are determined according to the shape and size of the input pinion 21 and the output gear 22.

[0047] The planetary stage end panel 120 is formed integrally with the side panel 110 at the end surface of the intermediate case 100 close to the planetary stage reduction mechanism 10 in a direction perpendicular to the axial direction of the reduction box. In other words, the side panel 110 extends along the axial direction of the reduction box toward the parallel stage reduction mechanism 20 at the edge of the planetary stage end panel 120 and is engaged with the input side case 300. The side panel 110 of the intermediate case 100 and the planetary stage end panel 120 constitute the main accommodation space of the parallel stage reduction mechanism 20. The planetary stage joint 130 is formed integrally with the planetary stage end panel 120 at the side of the planetary stage end panel 120 close to the planetary stage reduction mechanism 10 (also referred to as the outer side of the planetary stage end panel 120). The planetary stage joint 130 has a side wall protruding outward from the surface of the planetary stage end panel 120 along the axial direction of the reduction box. Preferably, the planetary stage joint 130 can be formed as a circular or approximately circular flange or frame corresponding to the shape and size of the inner gear ring case 400. The intermediate case 100 is fixedly connected to the inner gear case 400 via the planetary stage joint 130. Preferably, the planetary stage joint 130 is formed to have a circular shape aligned with the center of the output gear 22.

[0048] like Figure 3 and Figure 4As shown in , the planetary stage joint 130 divides the planetary stage end panel 120 into two parts. The part (corresponding to the part located inside the planetary stage end panel of the present disclosure and located inside the planetary stage housing space) within the contour range of the planetary stage joint 130 (i.e., located inside the raised side wall of the planetary stage joint 130) is located inside the housing of the reduction gearbox in the working state of the reduction gearbox, while the part not surrounded by the planetary stage joint 130 constitutes a part of the outer housing of the reduction gearbox. As described above, the output gear 22 of the parallel stage reduction mechanism 20 is connected to the sun gear (not shown in the figure) of the planetary stage reduction mechanism 10 through the drum gear. Therefore, the part of the planetary stage end panel 120 located inside the side wall of the planetary stage joint 130 is exactly at the connection interface between the planetary stage reduction mechanism 10 and the parallel stage reduction mechanism 20 in the axial direction of the reduction gearbox.

[0049] A bearing seat 121 for supporting the gear shaft of the output gear 22 of the parallel stage reduction mechanism 20 is formed at the center of the portion of the planetary stage end panel 120 located inside the side wall of the planetary stage joint 130. The center of the bearing seat 121 is aligned with the center of the gear shaft of the output gear 22. In addition, the planetary stage end panel 120 is also formed with a plurality of radial reinforcing ribs 122 and at least one circumferential reinforcing rib 123. The plurality of radial reinforcing ribs 122 extend along the radial direction of the output gear 22 and connect the bearing seat 121 to the peripheral edge portion 127 of the planetary stage end panel 120 close to the planetary stage joint 130. At least one circumferential reinforcing rib 123 is formed on the outer side of the bearing seat 121 along the circumferential direction of the gear shaft of the output gear 22 and includes a plurality of arc segments connected between two adjacent radial reinforcing ribs 122.

[0050] In such Figure 3 and Figure 4 In the example shown, a total of 8 radial reinforcing ribs 122 and one circumferential reinforcing rib 123 are formed, and the circumferential reinforcing rib 123 includes 8 arc segments. Of course, it should be understood that the number of radial reinforcing ribs 122 and circumferential reinforcing ribs 123 is not limited thereto. Figure 3 and Figure 4 In the example shown, the eight radial reinforcing ribs 122 are not evenly distributed along the circumferential direction. In other words, the angle between two adjacent radial reinforcing ribs 122 can be set according to factors such as the force conditions. In addition, the adjacent radial reinforcing ribs 122 and the circumferential reinforcing ribs 123 surround a hollow portion 125, and each hollow portion 125 has a fan ring shape similar to the fan shape of a folding fan. The planetary-stage housing space accommodating the planetary-stage reduction mechanism 10 and the parallel-stage housing space accommodating the parallel-stage reduction mechanism 20 are fluidically connected to each other via multiple hollow portions 125.

[0051] In order to adjust the oil level of the splash lubricating oil for the planetary reduction mechanism 10, the reduction gearbox housing according to the present disclosure is provided with an oil baffle plate 124 and an oil drain hole 126 in a part of a plurality of hollow portions 125 surrounded by adjacent radial reinforcement ribs 122 and circumferential reinforcement ribs 123. Figure 3 As shown in FIG. 1 , three oil baffles 124 are formed at the position of the hollow portion 125 at the bottom of the intermediate housing 100 when the reduction gearbox is in working state. The three oil baffles 124 close the hollow portion 125 that should have been formed, so that lubricating oil with a certain liquid level can be maintained in the planetary housing space located on one side of the planetary end panel 120 when the reduction gearbox is in working state.

[0052] Figure 5 FIG. 2 is a side cross-sectional view of a structural example of an intermediate case of a reduction gearbox according to the present disclosure. Figure 5 As shown in , since the oil baffle plate 124 is disposed on the lower side of the planetary end panel 120, the oil baffle plate 124 and the side wall of the planetary joint 130 together form an oil storage cavity at the bottom of the planetary box space, so that the lubricating oil can be kept on the planetary box space side of the planetary end panel 120. Figure 5 As shown by the arrow in FIG. 1 , when the maintained lubricating oil level exceeds the oil baffle plate height, the oil flows out from the planetary stage box space ( Figure 5 The space on the left side of the oil baffle plate 124 shown in FIG. 1 overflows to the parallel stage box space ( FIG. 10 ) on the other side of the planetary stage end panel 120. Figure 5 In the space shown in FIG. 124 on the right side of the oil baffle plate 124. Figures 3 to 5 In the illustrated embodiment, the oil baffle plate 124 is formed to extend from the peripheral edge portion 127 of the side wall of the planetary end panel 120 close to the planetary joint 130 along the radial reinforcement ribs 122 toward the circumferential reinforcement ribs 123, and completely close the corresponding fan-shaped hollow portion 125. In this case, the peripheral edge portion 127 between the inner wall of the planetary joint 130 and the oil baffle plate 124 can be regarded as constituting a part of the oil baffle plate 124, and the extension length L of the oil baffle plate 124 from the inner wall of the planetary joint 130 to the hollow portion 125 is L, which is the minimum oil baffle height L of the planetary end panel 120 provided with the oil baffle plate 124. In addition, for example, it is also possible to selectively provide a portion of the oil baffle plate 124 at the position of the planetary end panel 120. Figure 3 The hollow portion 125 between each oil baffle plate 124 and the bearing seat 121 is additionally formed with an oil baffle plate 124. In this case, the additional 1 to 3 pieces are located in the area surrounded by the radial reinforcement ribs 122, the circumferential reinforcement ribs 123 and the bearing seat 121.

[0053] It should be understood that the arrangement of the oil baffle 124 is not limited to the above example. Figure 5 As shown, the oil baffle plate 124 only needs to be set to enable the liquid level height of the lubricating oil for splash lubrication maintained at the bottom of the planetary-stage housing space to meet the design requirements of the reduction gearbox. In other words, the oil baffle plate 124 is at least formed at the periphery of the planetary-stage end panel 120 close to the planetary-stage joint 130, and is formed to extend upward in the vertical direction from the lowest point of the side wall of the planetary-stage joint 130 in the working state, and the minimum oil baffle height L extending upward is greater than the liquid level height of the lubricating oil that needs to be maintained at the bottom of the planetary-stage housing space.

[0054] In addition, a through oil drain hole 126 may be formed on the oil baffle plate 124. Figure 3 As shown, the main function of the oil drain hole 126 is to allow the lubricating oil remaining in the planetary stage housing space to drain to the parallel stage housing space through the oil drain hole 126 when the reduction gearbox is stopped, and to be discharged from the reduction gearbox through the oil drain port (not shown) located at a lower level in the space. In addition, during the operation of the reduction gearbox, the oil drain hole 126 also has the function of assisting oil drainage and controlling the liquid level in the planetary stage housing space. Figure 3 In the example shown, the three oil baffles 124 are each formed with an oil drain hole 126. Figure 3 The lower side of the middle oil baffle plate 124 at the lowest position shown in the figure is formed with two oil drain holes 126, while the two oil baffle plates 124 located on both sides are respectively formed with an oil drain hole 126 with a relatively large aperture at the corner near the planetary joint 130. However, the formation position, number and aperture of the oil drain hole 126 are not limited to the illustrated embodiment, but can be set according to the control requirements of the lubricating oil level. For example, a common design option is: the number of oil drain holes 126 is set to at least 1, the diameter of the oil drain hole is about 1 to 100 mm, and the total area of ​​the oil drain holes 126 accounts for the total area of ​​the planetary end plate 120 located on the inner side of the side wall of the planetary joint 130 (in other words, the total area is approximately equal to the cross-sectional area of ​​the planetary joint 130 in the direction perpendicular to the axial direction, which includes the area of ​​the hollowed-out portion of the planetary end plate 120) should be less than 5%. This arrangement ensures that the lubricating oil blocked by the oil baffle plate 124 and retained in the planetary-stage housing space will not leak out from the oil drain hole too quickly when the reduction gearbox is in operation, thereby affecting the lubrication effect of splash lubrication.

[0055] In addition, when multiple oil drain holes 126 are set on an oil baffle plate 124, it is best not to set the multiple oil drain holes 126 to be arranged in a direction parallel to the extension direction of the radial reinforcement ribs 122 to avoid the risk of reducing the structural strength. In addition, according to the setting position of the reduction box during operation and the desired oil storage height, only one oil drain hole 126 can be set on the lowest oil baffle plate 124, as long as the oil stored at the bottom of the planetary box space can be drained when the oil is drained during shutdown. The shape of the oil drain hole 126 is often circular for ease of processing, but its shape is not limited thereto, for example, it can also be square, elliptical, fan-shaped, runway-shaped, etc.

[0056] Since the oil baffle plate 124 and the oil drain hole 126 are provided, the oil level of the lubricating oil in the planetary stage housing space can be maintained at a desired height by adjusting the setting parameters of the oil baffle plate 124 and the oil drain hole 126. For example, preferably, the height of the oil level can be adjusted within a range of 1 / 8 to 1 / 2 of the radius of the circular planetary stage joint 130. Therefore, the reduction gearbox housing structure according to the present disclosure can achieve a balance between improving the lubrication effect of splash lubrication and reducing the oil stirring power loss of splash lubrication.

[0057] 3. Variations

[0058] The schematic structure of the reduction gearbox housing and the reduction gearbox according to the embodiment of the utility model has been described above. However, it should be understood that the structure of the reduction gearbox housing and the reduction gearbox of the utility model is not limited thereto, but various modifications can be made thereto within the utility model concept of the utility model.

[0059] For example, in the reduction gearbox housing and reduction gearbox according to the embodiment of the present invention described above, without considering the deliberately opened oil drain hole 126, one oil baffle plate 124 is formed to completely close one hollow portion 125. However, the setting method of the reduction gearbox housing and the reduction gearbox according to the present invention is not limited to this. The oil baffle plate 124 can be set as needed to not completely close the corresponding hollow portion 125 and have any shape. For example, the oil baffle plate 124 can be fan-shaped, trapezoidal, circular, and irregular polygonal. In the direction perpendicular to the extension direction of the oil baffle plate 124, the thickness of the oil baffle plate 124 can also be set according to the space size in the housing and the minimum thickness requirement of the casting process or machining process. In addition, the shape of the hollow portion 125 can also be flexibly designed. In the reduction gearbox housing and reduction gearbox according to the embodiment of the present invention described above, the hollow portion 125 is the largest hollow portion formed according to the shape of the reinforcing rib. In other words, the parts between the reinforcing ribs except for the necessary fillets, chamfers and other structures are all hollowed out. However, the hollow portion 125 can also be designed as a hole of any shape, as long as there is enough oil leakage area above the set liquid level. In other words, even if radial reinforcing ribs and circumferential reinforcing ribs are not formed on the planetary end panel 120, the oil baffle 124 and the hollow portion 125 can be set according to the liquid level of the lubricating oil for splash lubrication that needs to be maintained in the planetary box space.

[0060] Figure 6 The figure shows a front view of a structural example of an intermediate case of a reduction gearbox according to a modified example of the present disclosure. Figure 6 In the embodiment of the present invention, the intermediate case 100' is formed with oil baffles 124' of various shapes as shown in the shaded part in the figure. Accordingly, the shapes of the hollow parts 125' are also formed to be various. Please note that Figure 6 The oil drain hole is omitted in the illustration.

[0061] The above description is only the preferred embodiment and variant of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0062] Reference numerals list

[0063] Planetary reduction mechanism 10 Planetary gear 11 Planet carrier 12

[0064] Parallel stage reduction mechanism 20 Input small gear 21 Output large gear 22

[0065] Input flange 30 Output gear shaft 40

[0066] Middle box 100 Output side box 200

[0067] Input side box / parallel level side box 300 planetary level side box 500

[0068] Internal gear housing 400

[0069] Side panel 110 Planetary end panel 120 Planetary joint 130

[0070] Bearing seat 121 Radial reinforcement rib 122 Circumferential reinforcement rib 123

[0071] Oil baffle 124 Hollow portion 125 Oil drain hole 126

[0072] Peripheral part 127

[0073] The middle box 100' has an oil baffle plate 124' and a hollow portion 125'.

Claims

1. A reduction gearbox housing, comprising a parallel-stage side housing (300), an intermediate housing (100, 100') and a planetary-stage side housing (500), wherein the parallel-stage side housing (300) and the intermediate housing (100, 100') form a parallel-stage housing space for accommodating a parallel-stage reduction mechanism (20), and the planetary-stage side housing (500) and the intermediate housing (100, 100') form a planetary-stage housing space for accommodating a planetary-stage reduction mechanism (10). It is characterized in that The intermediate box (100, 100') comprises: a planetary stage end panel (120), wherein the planetary stage end panel (120) extends in a direction perpendicular to the axial direction of the parallel stage reduction mechanism (20), a side panel (110), the side panel (110) extending from an edge of the planetary end panel (120) along the axial direction of the parallel-stage reduction mechanism (20) toward the parallel-stage side housing (300) and engaging with the parallel-stage side housing (300), and a planetary joint portion (130), the planetary joint portion (130) protruding from the planetary end panel (120) toward the planetary side housing (500) and engaging with the planetary side housing (500), a portion of the planetary end panel (120) being located inside the planetary joint portion (130) and separating the planetary housing space from the planetary housing space, and The portion of the planetary stage end panel (120) is provided with an oil baffle plate (124, 124') and a hollow portion (125, 125'), the parallel stage housing space is fluidly connected with the planetary stage housing space via the hollow portion, and when the reduction gearbox housing is in working condition, the minimum height of the oil baffle plate (124, 124') extending upward in the vertical direction from the lowest point on the inner side of the planetary stage joint (130) is greater than or equal to the liquid level height of the lubricating oil for splash lubrication that needs to be maintained in the planetary stage housing space.

2. The reduction gearbox housing according to claim 1, characterized in that: At least one oil leakage hole (126) is formed on the oil baffle plate (124, 124'), and the oil leakage hole (126) penetrates the oil baffle plate (124, 124') in the axial direction.

3. The reduction gearbox housing according to claim 1 or 2, characterized in that: The portion of the planetary end panel (120) is further formed with a bearing seat (121), a plurality of radial reinforcing ribs (122) and at least one circumferential reinforcing rib (123); the bearing seat (121) is located at the center of the portion; the plurality of radial reinforcing ribs (122) are formed along the radial direction of the planetary joint (130) and connect the bearing seat (121) and a peripheral edge portion (127) of the portion close to the planetary joint (130); the circumferential reinforcing rib (123) is formed along the circumferential direction of the planetary joint (130) and includes a plurality of arc segments connected between two adjacent radial reinforcing ribs (122).

4. The reduction gearbox housing according to claim 3, characterized in that: The oil baffle plates (124) are formed in a region surrounded by the adjacent radial reinforcement ribs (122), the circumferential reinforcement ribs (123) and the peripheral edge portion (127), and each of the oil baffle plates (124) has a sector shape.

5. The reduction gearbox housing according to claim 4, characterized in that: The hollow portion (125) is formed in an area surrounded by the adjacent radial reinforcement ribs (122), the circumferential reinforcement ribs (123) and the bearing seat (121), and each of the hollow portions (125) has a sector shape.

6. The reduction gearbox housing according to claim 4, characterized in that: The oil baffle plate (124) is also formed in a region surrounded by the adjacent radial reinforcement ribs (122), the circumferential reinforcement ribs (123) and the bearing seat (121).

7. The reduction gearbox housing according to claim 1 or 2, characterized in that: The planetary side box (500) comprises: an inner gear ring housing (400), one end of the inner gear ring housing (400) being joined to the planetary stage joint (130); and An output side case (200) is connected to the other end of the inner gear ring case (400).

8. The reduction gearbox housing according to claim 7, characterized in that: The parallel stage side housing (300), the intermediate housing (100, 100'), the inner gear ring housing (400) and the output side housing (200) are respectively formed in one piece.

9. The reduction gearbox housing according to claim 2, characterized in that: The part is provided with a plurality of oil baffles (124') and a plurality of hollow portions (125'), and the shapes of the plurality of oil baffles (124') are different.

10. The reduction gearbox housing according to claim 2, characterized in that: The diameter of the oil drain holes (126) is 1-100 mm, and the total area of ​​each of the oil drain holes (126) accounts for less than 5% of the total area of ​​the portion of the planetary end plate (120) located inside the planetary joint (130).

11. The reduction gearbox housing according to claim 1 or 2, characterized in that: The minimum height of the oil baffle plate (124, 124') is set so that the liquid level height is maintained in the range of 1 / 8 to 1 / 2 of the radius of the planetary stage joint (130).

12. A reduction gearbox for a fracturing device, the reduction gearbox comprising a planetary reduction mechanism (10), a parallel reduction mechanism (20), an input flange (30), an output gear shaft (40) and a reduction gearbox housing, the planetary reduction mechanism (10) and the parallel reduction mechanism (20) being installed in the reduction gearbox housing, one end of the input flange (30) being connected to the input gear shaft of the parallel reduction mechanism (20), the other end of the input flange (30) being used to connect to a power source, one end of the output gear shaft (40) being connected to the output terminal of the planetary reduction mechanism (10), and the other end of the output gear shaft (40) being used to connect to the crankshaft input end in the crankcase of the fracturing device, characterized in that: The reduction gear box housing is the reduction gear box housing according to any one of claims 1 to 11.

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