Planetary carrier and gear box

Abstract

This invention discloses a planetary carrier and gearbox, belonging to the field of gearbox technology. The planetary carrier includes a planetary carrier body and at least one oil injection column. The planetary carrier body has two support webs arranged axially opposite each other, with oil inlet channels formed on the support webs. The oil injection column is disposed between the two support webs, and has an axial oil passage and an oil injection hole communicating with the axial oil passage inside. The fixed end of the oil injection column is connected to one of the support webs, and the free end extends in a direction away from the fixed end, forming a clearance with the other support web. The gearbox is equipped with the aforementioned planetary carrier. When the planetary carrier is under load, the clearance allows the free end to move slightly relative to the web, avoiding bending deformation and stress concentration of the oil injection column due to rigid constraints at both ends, effectively preventing the oil injection column from breaking, ensuring that lubricating oil is continuously sprayed from the oil injection hole through the axial oil passage, and guaranteeing reliable lubrication of the planetary carrier.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more particularly to a planetary carrier and gearbox. Background Technology

[0002] Planetary gear transmission mechanisms are widely used in various power transmission equipment. During operation, the meshing parts of the gears generate a large amount of frictional heat, requiring a continuous supply of lubricating oil for cooling and lubrication to ensure transmission efficiency and service life. In conventional planetary gear transmission structures, lubricating oil is typically delivered precisely to the meshing areas of the planet gears using columns mounted on the planet carrier.

[0003] In the existing technology, the two ends of the column are fixedly connected to the webs of the planetary carrier, and the column as a whole spans between the two webs. Lubricating oil is transported from inside the planetary carrier to each oil injection point through oil passages inside the column. The method of fixing at both ends is intended to ensure the positioning rigidity and support strength of the column in space, and to facilitate processing and assembly.

[0004] However, in long-term use, the existing uprights, with both ends rigidly fixed to the planetary carrier, suffer from severely limited overall deformation as end-constraint components when the planetary carrier is subjected to large torque, bending loads, or impact loads. This leads to stress concentration at the connection root between the upright and the web plate, or in the middle section of the upright. Under long-term alternating loads, fatigue cracks easily initiate in these stress concentration areas and gradually propagate, eventually causing the upright to fracture. Simultaneously, the sealing structure at the connection points is prone to failure due to deformation, resulting in lubricating oil leakage. Once the upright is damaged or leaks oil, it directly leads to an interruption of the oil supply, preventing effective lubrication of the planetary gear meshing area, thereby accelerating gear wear and shortening the overall machine's maintenance cycle and service life. Summary of the Invention

[0005] The purpose of this invention is to provide a planetary carrier and gearbox to solve the technical problems of stress concentration, easy breakage of the column and interruption of oil supply caused by fixing the two ends of the column in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a planetary carrier, the planetary carrier comprising: The planetary carrier body has two supporting webs arranged opposite each other along the axial direction, and the supporting webs are provided with oil inlet channels; At least one oil injection column is provided, which is disposed between the two supporting webs. The oil injection column has an axial oil passage that communicates with the oil inlet channel, and an oil injection hole that communicates with the axial oil passage is provided on the oil injection column. The spray column has a fixed end and a free end arranged opposite each other along the axial direction. The fixed end is connected to one of the supporting webs, and the free end extends in a direction away from the fixed end and forms a clearance gap with the other supporting web.

[0007] Preferably, at least two spray columns are provided, with at least one fixed end of the spray column connected to one of the supporting webs, and at least one fixed end of the spray column connected to the other supporting web.

[0008] Preferably, at least two of the oil spray columns are coaxially spaced along the axial direction, and a partition gap is formed between the free ends of the two coaxially spaced oil spray columns.

[0009] Preferably, the fixed end of the spray column and the corresponding supporting web are integrally formed; or, the fixed end of the spray column and the corresponding supporting web are detachably connected.

[0010] Preferably, when the fixed end of the oil spray column is detachably connected to the corresponding support web, the planetary carrier further includes a mounting base and fasteners. The mounting base is coaxially provided on the fixed end of the oil spray column, and the mounting base is detachably installed on the corresponding support web via the fasteners.

[0011] Preferably, the fixed end is integrally formed with the mounting base, and a stress transition structure is provided between the mounting base and the side wall of the spray column.

[0012] Preferably, the injection holes penetrate at least one side of the injection column radially, and there are multiple injection holes, which are arranged at intervals along the axial direction of the injection column.

[0013] Preferably, the diameter of the plurality of injection holes on the injection column increases sequentially from the fixed end to the free end. Preferably, the axial width of the clearance gap is L, the axial length of the oil injection column is D, and L / D = 0.2 to 0.5.

[0014] On the other hand, the present invention also provides a gearbox, the gearbox including a housing, planetary gears, a sun gear and the aforementioned planetary carrier, the planetary carrier being disposed inside the housing, the planetary gears being rotatably mounted on the planetary carrier, and the sun gear meshing with the planetary gears.

[0015] The beneficial effects of this invention are: The planetary carrier proposed in this invention features an oil injection column that is fixedly connected to one of the supporting webs only at its fixed end, while a clearance is left between the free end and the other supporting web. When the planetary carrier is subjected to torque, bending loads, or impact loads during operation, relative displacement or deformation will occur between the two supporting webs. Since the free end of the oil injection column is not fixed, it will not be forced to bend and deform due to the relative displacement of the supporting webs caused by simultaneous constraints at both ends, thereby reducing stress concentration in the middle and root of the fixed end of the oil injection column. Compared to existing technologies with fixed ends, the single-end fixing method of this invention allows the oil injection column to release the load through slight movement of the free end when under stress, resulting in a more uniform stress distribution and reducing the possibility of fatigue fracture. Simultaneously, because the alternating force borne by the fixed end is reduced, the sealing structure at this connection is less prone to damage from repeated stress, maintaining a reliable seal for a long time and effectively preventing lubricating oil leakage from the connection. Based on this, the connection between the oil inlet channel and the axial oil passage allows the lubricating oil to be continuously delivered to the oil injection hole through the axial oil passage and sprayed into the meshing area of ​​the planetary carrier body in a preset direction, ensuring uninterrupted oil supply. This ensures that the meshing area of ​​the planetary carrier body is always adequately lubricated and cooled, avoiding gear wear and temperature rise caused by insufficient oil, thereby extending the service life and maintenance cycle of the planetary carrier and the entire gearbox. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of one embodiment of the planetary carrier provided in this invention. Figure 2 yes Figure 1 Enlarged view of the middle section structure; Figure 3 This is a cross-sectional view of another embodiment of the planetary carrier provided in this invention; Figure 4 yes Figure 3 Enlarged view of the middle section structure; Figure 5 This is a cross-sectional view of another embodiment of the planetary carrier provided in this invention; Figure 6 yes Figure 5 Enlarged view of the middle part of the structure.

[0017] In the picture: 1. Planetary carrier body; 11. Support web; 12. Oil inlet channel; 2. Injection column; 21. Axial oil passage; 22. Injection hole; 2a. Fixed end; 2b. Free end; 3. Make room for space; 4. Partition gaps; 5. Mounting base; 6. Fasteners; 7. Stress transition structure. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] See Figures 1 to 6 The planetary carrier provided in this embodiment of the invention includes a planetary carrier body 1 and at least one oil injection column 2. The planetary carrier body 1 has two axially opposed supporting webs 11, each with an oil inlet channel 12. The oil injection column 2 is disposed between the two supporting webs 11, and has an axial oil passage 21 communicating with the oil inlet channel 12 within it. The oil injection column 2 also has an oil injection hole 22 communicating with the axial oil passage 21. The oil injection column 2 has a fixed end 2a and a free end 2b axially opposed to each other. The fixed end 2a is connected to one of the supporting webs 11, and the free end 2b extends away from the fixed end 2a, forming a clearance gap 3 with the other supporting web 11.

[0023] The planetary carrier body 1 has two radially extending support webs 11 arranged axially opposite each other, forming a space between them to accommodate the planetary gears. The two support webs 11 are parallel, and their central axes coincide with the rotation axis of the planetary carrier body 1, thus maintaining dynamic balance when the planetary carrier body 1 rotates. The shape of the support webs 11 can be set as an annular shape according to actual load-bearing requirements, with a through hole in the middle for the shaft hole of the planetary carrier body 1 to pass through, and the outer periphery for mounting the planetary gear shaft.

[0024] Furthermore, the oil inlet channel 12 is formed on one of the supporting web plates 11, or, depending on the specific oil supply path design requirements, corresponding oil inlet channels 12 are formed on both supporting web plates 11. In this embodiment, the number of oil inlet channels 12 matches the number of oil injection columns 2, so that each oil injection column 2 can be supplied with oil individually. The inner wall surface of the oil inlet channel 12 is precision machined to form a smooth inner wall of the oil passage, which helps to reduce the flow resistance of lubricating oil. To improve the sealing performance, a sealing groove can be provided at the outer opening end of the oil inlet channel 12 located on the supporting web plate 11 for installing a sealing ring or sealing gasket to prevent lubricating oil from leaking outward from the connection gap between the oil inlet channel 12 and the external components.

[0025] The input end of the oil inlet channel 12 is used to connect to the oil supply system outside the planetary carrier. Specifically, in the actual installation state, the side of the support web 11 facing away from the oil injection column 2 is provided with an oil inlet end face, which is in contact with the oil outlet on the end cover or bearing seat outside the planetary carrier. When the planetary carrier is assembled inside the gearbox, the oil supply system pressurizes the lubricating oil and delivers it to the oil collection chamber or oil passage inside the gearbox housing after being pumped, and then guides the lubricating oil into the input end of the oil inlet channel 12 on the support web 11 through the corresponding oil outlet on the housing.

[0026] The spray column 2 is disposed between two supporting webs 11, and the spray column 2 extends along the axial direction of the planetary carrier body 1. The spray column 2 is cylindrical and has a fixed end 2a and a free end 2b arranged opposite each other along the axial direction. The fixed end 2a is connected to one of the supporting webs 11, and the free end 2b extends away from the fixed end 2a.

[0027] In one embodiment, the outer diameter of the spray column 2 remains consistent from the fixed end 2a to the free end 2b to ensure ease of processing and installation. In another embodiment, the spray column 2 can also be configured as a stepped shaft, where the fixed end 2a has a larger diameter to enhance connection strength, while the remaining portion maintains a smaller diameter, thereby reducing overall weight while ensuring structural strength.

[0028] An axial oil passage 21 is provided inside the oil injection column 2, extending axially along the planetary carrier. This axial oil passage 21 is used to transport lubricating oil from the oil inlet channel 12 along the length of the oil injection column 2. The axial oil passage 21 is a circular through-hole inside the oil injection column 2, with its central axis coinciding with the central axis of the oil injection column 2. This facilitates machining and ensures uniform wall thickness of the oil injection column 2, avoiding localized weaknesses caused by eccentricity. The length of the axial oil passage 21 is approximately equal to the effective length of the oil injection column 2, extending from near the fixed end 2a to near the free end 2b.

[0029] Specifically, the output end of the oil inlet channel 12 is connected to the input end of the axial oil passage 21, and the oil inlet channel 12 is perpendicular to the axial oil passage 21. This means that when the lubricating oil enters the axial oil passage 21 from the oil inlet channel 12, it needs to go through a 90-degree turning path. When the external oil supply system stops working or the oil supply pressure fluctuates momentarily, the lubricating oil in the axial oil passage 21, which has a tendency to flow back due to gravity or residual pressure, cannot flow smoothly in the opposite direction of the oil supply direction when it reaches the junction of the oil inlet channel 12 and the axial oil passage 21. Since the oil inlet channel 12 and the axial oil passage 21 are not in a straight line, the backflowing oil must overcome the local resistance at the turning point and the internal friction of the lubricating oil itself before it can enter the oil inlet channel 12. This flow resistance is sufficient to suppress the backflow of oil when the oil supply is interrupted.

[0030] Furthermore, the oil injection hole 22 penetrates at least one side of the oil injection column 2 radially, that is, the oil injection hole 22 is perpendicular to and connected to the axial oil passage 21, so that the lubricating oil in the axial oil passage 21 can be sprayed out radially through the oil injection hole 22.

[0031] In one embodiment, the oil injection hole 22 is located on the side of the oil injection column 2 facing the planetary gear meshing area to ensure that the sprayed lubricating oil can be directly sprayed onto the meshing position of the planetary gear teeth. The single-sided opening of the oil injection hole 22 has the advantages of simple structure and strong oil supply directionality, which can concentrate all the lubricating oil on the key parts that need lubrication and avoid oil waste.

[0032] In another embodiment, considering that during the operation of the planetary gear, the area near its meshing region includes not only the tooth surface contact area, but also the tooth root, tooth tip, and bearing clearance between the planetary gear and the planetary gear shaft, which are points requiring auxiliary lubrication, oil injection holes 22 can be provided on both radially opposite sides of the oil injection column 2. That is, oil injection holes 22 are simultaneously opened on the side facing the meshing region of the planetary gear and the side away from the meshing region. In the embodiment with holes on both sides, the oil injection hole 22 on the side facing the meshing region is still responsible for directly spraying most of the lubricating oil to the tooth surface meshing position, while the oil injection hole 22 on the side away from the meshing region can guide some of the lubricating oil to the bearing part of the planetary gear shaft or the non-meshing tooth surface of the planetary gear, to supplement the lubrication and cooling of the auxiliary friction pair.

[0033] In this embodiment, multiple oil injection holes 22 are provided, and these holes are arranged at intervals along the axial direction of the oil injection column 2 to ensure that the lubricating oil is evenly distributed along the tooth width direction of the planetary gear, thereby providing all-round coverage of the meshing area and improving the lubrication effect. The axial spacing between each oil injection hole 22 can be optimized according to the actual tooth width of the planetary gear and the specific position of the meshing area to ensure that the oil sprayed from adjacent oil injection holes 22 can form a continuous oil curtain or oil line, avoiding lubrication dead zones. The inner diameter of each oil injection hole 22 can be selected according to the actual oil supply and injection speed requirements; it can be set to have the same diameter or different diameters according to specific injection requirements.

[0034] Considering that the lubricating oil will experience pressure loss due to friction of the pipe wall when flowing axially in the axial oil passage 21, the pressure at the oil injection hole 22 near the fixed end 2a is higher, while the pressure at the oil injection hole 22 near the free end 2b gradually decreases. When the diameter of multiple oil injection holes 22 is the same, the oil output speed of the oil injection hole 22 near the free end 2b may be lower than that of the oil injection hole 22 near the fixed end 2a, resulting in uneven distribution of oil injection volume along the tooth width direction.

[0035] Therefore, in a preferred embodiment, the diameter of the plurality of injection holes 22 on the injection column 2 increases sequentially from the fixed end 2a to the free end 2b. Specifically, the injection holes 22 located near the fixed end 2a have smaller diameters, while the diameters of the injection holes 22 gradually increase as they move closer to the free end 2b. This gradual diameter design utilizes the lower flow resistance generated by the larger diameter at the free end 2b to compensate for insufficient driving force caused by pressure drop, thereby ensuring that the injection velocity and injection quantity at the outlet of each injection hole 22 are more balanced. This achieves a consistent lubrication effect along the entire tooth width of the planetary gear, avoiding the problem of insufficient lubrication on the tooth surface due to differences in oil supply at both ends of the axial direction, and further improving the uniformity and reliability of lubrication in the meshing area of ​​the planetary gear.

[0036] Regarding the connection method between the spray column 2 and the supporting web 11, as follows: Figure 1 and Figure 2As shown, in one embodiment, the fixed end 2a of the oil-spraying column 2 and the corresponding supporting web 11 are integrally formed. Specifically, during the casting or forging process of the planetary carrier body 1, the oil-spraying column 2 is directly formed as part of the planetary carrier body 1, that is, the fixed end 2a of the oil-spraying column 2 protrudes integrally from the inner surface of the supporting web 11, and there is no assembly gap or connection interface between it and the supporting web 11. The integral forming method can be achieved by processes such as sand casting, investment casting, or precision forging. During forming, the outer surface of the oil-spraying column 2 and the inner surface of the supporting web 11 transition smoothly, avoiding minor misalignment caused by subsequent processing or assembly. Since there is no connection gap between the oil-spraying column 2 and the supporting web 11, the integrally formed structure can effectively prevent the possibility of lubricating oil leakage from the connection between the fixed end 2a and the supporting web 11. Therefore, there is no need to set additional sealing elements, which simplifies the assembly process and eliminates the risk of oil leakage caused by the aging and failure of the seals. Meanwhile, the one-piece molded structure ensures that the load transfer path between the two is a continuous internal material path, without stress abrupt changes or relative micro-movements at the contact interface, further enhancing the ability of the fixed end 2a to resist alternating loads.

[0037] In another embodiment, the fixed end 2a of the spray column 2 is detachably connected to the corresponding support web 11 to facilitate the individual processing, replacement, maintenance and cleaning of the spray column 2.

[0038] Specifically, such as Figure 3 and Figure 4 As shown, when the fixed end 2a of the injection column 2 is detachably connected to the corresponding support web 11, the planetary carrier also includes a mounting base 5 and a fastener 6. The mounting base 5 is coaxially arranged on the fixed end 2a of the injection column 2, and the mounting base 5 is detachably installed on the corresponding support web 11 via the fastener 6. Through this detachable connection, when individual injection columns 2 experience blockage of the injection holes 22 or damage to the column body due to long-term use, the injection column 2 can be individually removed from the support web 11 for cleaning, repair, or replacement without replacing the entire planetary carrier body 1, thus reducing maintenance costs and downtime.

[0039] In this embodiment, the mounting base 5 is a connecting flange that protrudes radially outward from the fixed end 2a of the spray column 2. The connecting flange has multiple bolt holes evenly distributed circumferentially. Correspondingly, the supporting web 11 has multiple threaded holes. The fastener 6 is a fastening bolt that passes through the bolt holes and is screwed into the threaded holes on the supporting web 11. By tightening the fastening bolt, the end face of the connecting flange is tightly fitted to the inner surface of the supporting web 11, thereby fixing the spray column 2.

[0040] To ensure the sealing performance at the connection between the mounting base 5 and the supporting web 11, a sealing gasket can be provided between the connecting flange and the supporting web 11. The sealing gasket is embedded in the annular sealing groove opened on the end face of the connecting flange. When the fastening bolts are tightened, the sealing gasket is compressed and produces elastic deformation, thereby filling the tiny gap between the end face of the flange and the supporting web 11, effectively preventing lubricating oil from seeping out from the connection interface.

[0041] In other embodiments, the mounting base 5 can also be in the form of a threaded sleeve, that is, the outer peripheral surface of the mounting base 5 is provided with external threads, and the supporting web 11 is provided with corresponding internal threaded holes. The oil spray column 2 is directly screwed into the internal threaded hole of the supporting web 11 through the threaded sleeve to achieve detachable fixation. Alternatively, the mounting base 5 can also adopt a conical sleeve structure, that is, the outer peripheral surface of the mounting base 5 is a conical surface, and the mounting hole on the supporting web 11 is a matching conical hole. The oil spray column 2 is press-fitted into the supporting web 11 through the conical surface fit, and axial positioning is achieved by relying on the self-locking effect of the conical surface. At the same time, it is prevented from loosening by the use of a lock nut. This conical surface fit method has good centering and load-bearing capacity, and is suitable for heavy-duty working conditions.

[0042] Furthermore, the fixed end 2a and the mounting base 5 are integrally formed, that is, the spray column 2, the fixed end 2a and the mounting base 5 form a whole component, which can ensure that there are no weak links between the fixed end 2a and the mounting base 5, and avoid loosening or relative displacement caused by separate connection.

[0043] Based on this, a stress transition structure 7 is provided between the mounting base 5 and the side wall of the spray column 2. Specifically, the stress transition structure 7 is a gradually narrowing transition step formed from one end face of the mounting base 5 facing the free end 2b of the spray column 2 to the outer peripheral surface of the spray column 2. The transition step has a large radius of curvature, which can transfer and diffuse the stress from the connection between the mounting base 5 and the spray column 2 along a relatively gentle path inside the material, avoiding stress concentration caused by abrupt changes in cross-section.

[0044] Specifically, when the injection column 2 is subjected to bending moment or tensile load during operation, the load is transferred from the injection column 2 body to the mounting base 5 through the stress transition structure 7. Due to the presence of the stress transition structure 7, the load transfer area gradually transitions from the small cross-section of the injection column 2 to the large cross-section of the mounting base 5. This gradual change in cross-section smooths the stress distribution gradient, preventing a sharp increase in stress at abrupt changes in cross-section. Simultaneously, the stress transition structure 7 can also guide metal flow lines during casting or forging, ensuring a continuous distribution of metal flow lines along the contour of the transition structure, thereby further improving the fatigue strength of this area.

[0045] The number of oil injection columns 2 can be flexibly configured according to actual lubrication needs and the number of planetary gears. For example... Figure 1 and Figure 2 As shown, in one embodiment, the injection column 2 is provided as a single unit, wherein the fixed end 2a of a single injection column 2 is connected to one of the supporting webs 11, and the free end 2b extends away from the fixed end 2a, forming a clearance gap 3 between it and the other supporting web 11. The axial width of the clearance gap 3 can be set according to the overall size of the planetary carrier and the expected load-bearing conditions. When the clearance gap 3 is small, the distance between the free end 2b of the injection column 2 and the other supporting web 11 is relatively close, and the overall stiffness of the injection column 2 is relatively high, which is suitable for working conditions with relatively stable loads and small impacts. When the clearance gap 3 is large, the free end 2b of the injection column 2 has more room for movement, which can accommodate larger relative deformations between the two supporting webs 11, and is suitable for situations that bear heavy loads or impact loads.

[0046] like Figure 5 and Figure 6 As shown, in another embodiment, at least two spray columns 2 are provided, with at least one fixed end 2a of the spray column 2 connected to one of the supporting webs 11, and at least one fixed end 2a of the spray column 2 connected to the other supporting web 11.

[0047] Specifically, taking two spray column 2 as an example, the fixed ends 2a of the two spray column 2 are respectively connected to the two supporting webs 11. That is, the fixed end 2a of one spray column 2 is fixed to one of the supporting webs 11, and its free end 2b extends toward the other supporting web 11; the fixed end 2a of the other spray column 2 is fixed to the other supporting web 11, and its free end 2b extends toward the one of the supporting webs 11.

[0048] The two oil spraying columns 2 located on the two supporting webs 11 can be coaxially or staggered.

[0049] When the two oil injection columns 2 are coaxially arranged, their central axes coincide, both extend along the axial direction of the planetary carrier body 1 and are located on the same straight line. The free ends 2b of the two oil injection columns 2 are positioned opposite each other, which is conducive to the two oil injection columns 2 supplying oil to the meshing areas on both sides of the planetary gear located between them at the same time, making the lubrication more uniform and comprehensive.

[0050] When the two oil injection columns 2 are staggered, their central axes are parallel to each other but not on the same straight line. That is, the two oil injection columns 2 are offset in the circumferential direction. This arrangement is suitable for working conditions where the planetary gears are arranged relatively dispersed in the circumferential direction and need to supply oil to different meshing areas from different angles. The staggered arrangement can avoid the two oil injection columns 2 from interfering in space, so that the lubricating oil sprayed by each can cover the corresponding lubrication position at a more suitable angle.

[0051] Preferably, the free ends 2b of at least two injection columns 2 are coaxially spaced and spaced apart, and a partition gap 4 is formed between the free ends 2b of the two coaxially arranged injection columns 2. The width of the partition gap 4 is smaller than the width of the clearance gap 3, and the specific size of the partition gap 4 can be determined according to the swing margin required by each of the two injection columns 2.

[0052] Since the two oil-spraying columns 2 extend towards each other from the supporting webs 11 on both sides, when the planetary carrier is subjected to alternating loads, the free end 2b of each oil-spraying column 2 will each generate a small axial displacement or sway within the partition gap 4. Due to the existence of the partition gap 4, there is always sufficient space between the two free ends 2b, so that the columns on both sides will not collide or abut against each other when deformed under stress, thereby avoiding the formation of new constraint points.

[0053] Furthermore, here we set the axial width of the clearance 3 to be L, and the axial length of the injection column 2 to be D. The axial width L of the clearance 3 and the axial length D of the injection column 2 satisfy the following relationship: L / D = 0.2~0.5. Within this range, it can be ensured that the free end 2b of the injection column 2 has sufficient displacement space to release stress, and it can also be ensured that the injection column 2 has sufficient bending stiffness to maintain a stable injection posture, thus achieving the best balance between stress release and structural stiffness.

[0054] In practical applications, the L / D ratio can be selected within the above range according to the specific working conditions, such as 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5. For applications with high rotational speed and large centrifugal force, a smaller ratio can be selected to ensure stiffness; for applications with large load impact and significant relative displacement of the web, a larger ratio can be selected to ensure sufficient room for movement. No limitation is imposed here.

[0055] This invention also provides a gearbox. The gearbox includes a housing, planetary gears, a sun gear, and the aforementioned planetary carrier. The housing is the external shell structure of the gearbox, and an internal space is formed to accommodate the planetary carrier, planetary gears, and sun gear, among other transmission components. The housing also has a lubricating oil inlet and outlet for connection to an external oil supply system. The planetary carrier is disposed inside the housing, and its two ends are rotatably supported on opposite side walls of the housing via bearings or sliding bushings, allowing the planetary carrier to rotate freely around its own axis within the housing. The planetary gears are rotatably mounted on the planetary carrier. Specifically, the planetary gears are mounted via planetary gear shafts in planetary gear shaft mounting holes between two supporting webs 11. The two ends of the planetary gear shafts are respectively fixed to the two supporting webs 11, and the planetary gears are sleeved on the outside of the planetary gear shafts and can rotate freely around these shafts. The sun gear is located at the center of the planetary carrier and meshes with the planetary gears. Meanwhile, an internal gear ring is also provided on the outside of the planetary carrier. The internal gear ring is fixed to the inner wall of the gearbox or integrally formed with the gearbox. The planet gears mesh with both the sun gear and the internal gear ring, thus forming a complete planetary gear transmission pair. During operation, power is input from the sun gear or output from the planetary carrier, or vice versa. The planet gears revolve around the sun gear while rotating on their own axes, thereby realizing power transmission and speed conversion.

[0056] When the planetary gears rotate, frictional heat is generated in the meshing area of ​​their teeth, requiring continuous cooling and lubrication with lubricating oil. Lubricating oil supplied by the external oil supply system enters the gearbox through the lubricating oil inlet on the gearbox housing, then enters the axial oil passage 21 of the injection column 2 via the oil inlet channel 12 on the support web 11, and finally is sprayed out from the injection hole 22 to the meshing area of ​​the planetary gears. Because the injection column 2 of the planetary carrier adopts a structure with one end fixed and a clearance 3 formed between the free end 2b and the other side support web 11, even if the planetary carrier experiences relative displacement between the two support webs 11 due to large torque, bending loads, or impact loads during gearbox operation, the free end 2b of the injection column 2 can release stress through slight movement or oscillation, preventing stress concentration and fatigue fracture of the column due to constraints at both ends. Therefore, the gearbox can maintain the structural integrity and oil supply stability of the oil injection column 2 under long-term heavy load conditions. The planetary gear meshing area can always obtain sufficient and reliable lubricating oil supply, effectively reducing gear wear and the risk of galling, and extending the service life and maintenance cycle of the entire gearbox.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A planet carrier, characterized in that include: The planetary carrier body (1) has two supporting webs (11) arranged opposite each other along the axial direction, and the supporting webs (11) are provided with oil inlet channels (12). At least one oil injection column (2) is provided between two of the supporting webs (11). An axial oil passage (21) communicating with the oil inlet channel (12) is provided in the oil injection column (2), and an oil injection hole (22) communicating with the axial oil passage (21) is provided on the oil injection column (2). The spray column (2) has a fixed end (2a) and a free end (2b) arranged opposite each other along the axial direction. The fixed end (2a) is connected to one of the supporting webs (11), and the free end (2b) extends away from the fixed end (2a) and forms a clearance gap (3) with the other supporting web (11).

2. The planet carrier of claim 1, wherein At least two spray columns (2) are provided, with at least one fixed end (2a) of the spray column (2) connected to one of the supporting webs (11), and at least one fixed end (2a) of the spray column (2) connected to the other supporting web (11).

3. The planet carrier of claim 2, wherein At least two of the oil spray columns (2) are coaxially arranged and spaced apart, and a partition gap (4) is formed between the free ends (2b) of the two coaxially arranged oil spray columns (2).

4. The planet carrier of claim 1, wherein The fixed end (2a) of the spray column (2) and the corresponding supporting web (11) are integrally formed. Alternatively, the fixed end (2a) of the spray column (2) can be detachably connected to the corresponding support web (11).

5. The planet carrier of claim 4, wherein When the fixed end (2a) of the oil spray column (2) is detachably connected to the corresponding support web (11), the planetary carrier also includes a mounting base (5) and a fastener (6). The fixed end (2a) of the oil spray column (2) is coaxially provided with the mounting base (5), and the mounting base (5) is detachably installed on the corresponding support web (11) through the fastener (6).

6. The planet carrier of claim 5, wherein The fixed end (2a) is integrally formed with the mounting base (5), and a stress transition structure (7) is provided between the mounting base (5) and the side wall of the oil spray column (2).

7. The planet carrier of claim 1, wherein The oil injection hole (22) penetrates at least one side of the oil injection column (2) radially, and there are multiple oil injection holes (22), which are arranged at intervals along the axial direction of the oil injection column (2).

8. The planet carrier of claim 7, characterized in that The diameter of the plurality of oil injection holes (22) on the oil injection column (2) increases sequentially from the fixed end (2a) to the free end (2b).

9. The planet carrier of claim 1, wherein The axial width of the clearance gap (3) is L, and the axial length of the oil injection column (2) is D, and L / D = 0.2 to 0.

5.

10. A gear box characterized in that, The device includes a housing, planetary gears, a sun gear, and a planet carrier as described in any one of claims 1-9, wherein the planet carrier is disposed inside the housing, the planetary gears are rotatably mounted on the planet carrier, and the sun gear meshes with the planetary gears.

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