Rotary input shaft lubrication seal structure and rotary shaft

Abstract

The utility model relates to a technical field of shafting lubrication seal, especially relates to a rotary input shaft lubrication seal structure and rotating shaft, this structure sets up several levels of step hole in the input flange inside, sets up oil way baffle as the stepped structure, through the clearance cooperation of oil way baffle and input flange and input shaft, and cooperates the setting of O ring, forms multistage reinforced seal structure, can effectively coordinate assembly stress and sealing pressure, good stability, can effectively resist dynamic stress under high temperature, vibration alternating working condition, simultaneously, the stepped oil way baffle structure, while compensating centrifugal force influence, can balance stress distribution through the fastening effect of screw, avoid local uneven loading, improve mechanical stability and operation reliability of sealing structure, can provide all -round package type's limit and compact structure for O ring, can effectively avoid that the sealing ring produces stress relaxation, solve the poor stability problem of existing lubrication seal structure.

Description

Technical Field

[0001] This utility model relates to the field of shaft lubrication and sealing technology, specifically to a rotary input shaft lubrication and sealing structure and a rotary shaft. Background Technology

[0002] In modern industry, industrial equipment is rapidly developing towards higher speeds and heavier loads. Higher speeds mean continuously increasing the rotational speed of shaft systems to achieve higher production efficiency and machining accuracy; heavier loads require shaft systems to withstand greater loads and meet the demands of various complex working conditions. The lubrication and sealing performance of high-speed rotating shaft systems has become a core challenge restricting the reliability of transmission systems. Poor lubrication leads to accelerated wear of key components such as gear pairs and splines, reducing equipment lifespan. Lubrication and sealing are crucial for ensuring effective lubrication. Failure of lubrication seals prevents lubricating oil from effectively reaching key friction points such as gear pairs and splines, resulting in increased direct contact and friction between these components. This increases energy loss in the transmission system, reducing transmission efficiency, wasting resources, polluting the environment, and even causing equipment failures, threatening production safety.

[0003] Traditional labyrinth seals are often affected by the thermal deformation of the shaft system, making it difficult to maintain clearance stability. O-ring seals, on the other hand, can prevent lubricating oil leakage and prevent external contaminants from entering, thus ensuring the sealing of the shaft system structure. However, under high temperature and alternating vibration conditions, traditional O-rings are prone to losing their sealing performance due to dynamic stress relaxation, leading to increased dynamic leakage at the sealing interface, which seriously threatens the lifespan and operational safety of the equipment. Utility Model Content

[0004] To address the problem that existing lubrication and sealing structures have poor stability and cannot meet the requirements of high-speed rotation of the input shaft, this utility model provides a lubrication and sealing structure for a rotary input shaft and a rotary shaft.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a rotary input shaft lubrication and sealing structure, including an input flange sleeved on the end of the input shaft. The interior of the input flange is provided with several stepped holes along the axial direction of the input shaft. An oil passage baffle is provided in the stepped holes with clearance fit. The oil passage baffle is connected to the end of the input shaft by screws. The oil passage baffle has a stepped structure and is clearance fit with the end of the input shaft. An O-ring is provided in the gap formed by the oil passage baffle, the input shaft and the input flange.

[0007] Optionally, the cross-sectional area of ​​the O-ring is greater than 7.5%.

[0008] Optionally, the inside of the input flange is provided with four stepped holes along the axial direction of the input shaft, and the diameter of the stepped holes decreases step by step from the end face of the input flange towards the input shaft. The oil passage baffle is clearance-fitted with the inner wall of the second stepped hole starting from the end face of the input flange.

[0009] Optionally, the third-stage stepped hole, starting from the end face of the input flange, forms an annular sealing space with the end faces of the input shaft and the oil circuit baffle, and the O-ring is disposed within the annular sealing space.

[0010] Optionally, the input shaft is connected to the input flange via a spline.

[0011] Optionally, the input shaft is provided with an oil passage hole structure.

[0012] Optionally, the oil passage structure includes a radial oil passage arranged radially along the input shaft and an axial oil passage arranged axially along the input shaft, wherein the radial oil passage and the axial oil passage are interconnected.

[0013] Optionally, the radial oil passage is located between the screw and the spline, and connects the gap between the input flange and the input shaft to form a lubrication channel for the spline.

[0014] Optionally, a tapered plug is provided at the end of the screw corresponding to the position of the axial oil passage hole to seal the axial oil passage hole.

[0015] A rotating shaft includes the aforementioned rotary input shaft lubrication and sealing structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention provides a rotary input shaft lubrication and sealing structure. This structure, through the arrangement of several stepped holes inside the input flange and the stepped oil passage baffle, forms a multi-stage reinforced sealing structure through the clearance fit between the oil passage baffle and the input flange and input shaft, along with the inclusion of an O-ring. This effectively coordinates assembly stress and sealing pressure, exhibiting good stability and effectively resisting dynamic stress under high temperature and alternating vibration conditions. Simultaneously, the stepped oil passage baffle structure, while compensating for centrifugal force, balances stress distribution through screw tightening, preventing uneven local load distribution and improving the mechanical stability and operational reliability of the sealing structure. Furthermore, it provides a comprehensive, enveloping, limiting, and compressing structure for the O-ring, effectively preventing stress relaxation in the seal ring and further enhancing the sealing effect of the lubricating oil. This provides a reliable solution to the lubrication and sealing challenges of industrial equipment under high speed and high load conditions.

[0018] The cross-sectional ratio of the O-ring is greater than 7.5%. The cross-sectional ratio is the ratio of the cross-sectional diameter of the O-ring to its inner diameter. A cross-sectional ratio greater than 7.5% means that the sealing ring has a greater thickness than the traditional standard setting, which can more effectively fill the gap formed by the oil passage baffle, the input shaft and the input flange, and has a larger contact area with the sealing gap, thereby achieving a good seal and preventing lubricating oil leakage.

[0019] The input flange has four stepped holes along the axial direction of the input shaft inside, and the diameter of the stepped holes decreases step by step from the end face of the input flange to the input shaft, forming a multi-level sealing barrier. When lubricating oil attempts to leak from the gap between the input shaft and the input flange, each stepped hole is equivalent to a sealing barrier, making it difficult for lubricating oil to overflow by crossing the steps, greatly increasing the difficulty of lubricating oil leakage and effectively improving the reliability of the seal.

[0020] The third-stage stepped hole, starting from the input flange end face, forms an annular sealing space with the input shaft and the oil passage baffle end face. The O-ring is set within this annular sealing space. This annular sealing space, formed by the third-stage stepped hole, the input shaft, and the oil passage baffle end face, provides a relatively independent and structurally sound sealing environment for the O-ring. The O-ring is positioned within this space and is in close contact with the input shaft and the oil passage baffle end face, forming a double sealing interface. When lubricating oil attempts to leak from the gap between the input shaft and the input flange, it first encounters the sealing barrier formed by the O-ring and the input flange. If a small amount of lubricating oil still manages to break through this barrier, it will be further intercepted by the seal formed by the O-ring and the oil passage baffle end face, greatly reducing the risk of lubricating oil leakage and improving the reliability of the seal.

[0021] The input shaft and input flange are connected by a spline, enabling efficient torque transmission.

[0022] The input shaft is provided with an oil passage structure, which includes a radial oil passage hole arranged radially along the input shaft and an axial oil passage hole arranged axially along the input shaft. The radial oil passage hole and the axial oil passage hole are interconnected. The radial oil passage hole is located between the screw and the spline, and connects to the gap between the input flange and the input shaft to form a lubrication channel for the spline. This oil passage structure can directly guide the lubricating oil to the spline area, allowing the lubricating oil to accurately enter the meshing surface of the spline, avoiding pitting or wear of the spline, and improving the reliability and durability of the spline.

[0023] The end of the screw is provided with a tapered plug at the position corresponding to the axial oil passage hole, which can reliably seal the axial oil passage hole. At the same time, the sealing effect of the tapered plug is less affected by pressure. During the operation of the equipment, even if the pressure in the system changes, the tapered plug can maintain good sealing performance and will not leak due to pressure fluctuations.

[0024] This utility model also provides a rotating shaft, including the aforementioned rotating input shaft lubrication and sealing structure. Because this rotating shaft employs the aforementioned lubrication and sealing structure, it possesses excellent lubrication and sealing performance, as well as a compact and reasonable structural design. This enables efficient lubrication and smooth oil return, and precisely coordinates assembly stress and sealing pressure, preventing localized overload and seal failure, thereby reducing the failure rate of the transmission system and extending its service life. Under high-speed rotation conditions, this rotating shaft ensures a long-lasting and stable lubrication effect while effectively suppressing leakage. Its application not only improves the stability and reliability of equipment operation but also effectively reduces operating and maintenance costs, providing strong support for improving production efficiency. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of a rotary input shaft lubrication and sealing structure according to the present invention.

[0026] Figure 2 This is a left view of a rotary input shaft lubrication and sealing structure according to the present invention.

[0027] Among them, 1-oil passage baffle, 2-O-ring, 3-screw, 4-conical plug, 5-input flange, 6-input shaft, 7-spline, 8-radial oil passage hole, 9-axial oil passage hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0035] See Figure 1 and Figure 2This utility model discloses a rotary input shaft lubrication and sealing structure, including an input flange 5 sleeved on the end of an input shaft 6, the input flange 5 being connected to the input shaft 6 via a spline 7; the interior of the input flange 5 having several stepped holes along the axial direction of the input shaft 6; an oil passage baffle 1 being clearance-fitted within the stepped holes, the oil passage baffle 1 being connected to the end of the input shaft 6 via screws 3, preferably, the screws 3 being hexagon socket head cap screws; the oil passage baffle 1 having a stepped structure and clearance-fitting with the end of the input shaft 6; the oil passage baffle 1, the input shaft 6, and the input flange... An O-ring 2 is provided within the gap formed by 5. Preferably, the cross-sectional diameter ratio of the O-ring 2 is greater than 7.5%. An oil passage structure is provided on the input shaft 6. The oil passage structure includes a radial oil passage 8 arranged radially along the input shaft 6 and an axial oil passage 9 arranged axially along the input shaft 6. The radial oil passage 8 and the axial oil passage 9 are interconnected. The radial oil passage 8 is located between the screw 3 and the spline 7 and connects the gap between the input flange and the input shaft to form a lubrication channel for the spline 7. The end of the radial oil passage 8 is provided with an annular cavity along the circumference of the input shaft 6 to isolate the spline 7.

[0036] Optionally, the input flange 5 has four stepped holes along the axial direction of the input shaft 6, with the diameter of the stepped holes decreasing progressively from the end face of the input flange 5 towards the input shaft 6. The oil passage baffle 1 is clearance-fitted with the inner wall of the second-stage stepped hole, measured from the end face of the input flange 5. The third-stage stepped hole, measured from the end face of the input flange 5, forms an annular sealing space with the input shaft 6 and the end face of the oil passage baffle 1. The O-ring 2 is disposed within the annular sealing space. The spline 7 is disposed within the fourth-stage stepped hole, measured from the end face of the input flange 5. Lubricating oil is injected from the right side of the fourth-stage stepped hole of the input shaft 6 and evenly distributed through radial lubrication channels, providing sufficient lubrication for the spline inside the input flange and the external spline at the left end of the input shaft, reducing friction and wear, and improving the long-term stability of the system.

[0037] Optionally, the oil circuit baffle 1 is provided with two-stage stepped holes in sequence from the end face to the input shaft, and the diameter of the stepped holes decreases step by step. The screw 3 is clearance-fitted into the interior of the two-stage stepped holes, and the bottom of the cylindrical head of the screw 3 is in contact with the end face of the first-stage stepped hole of the oil circuit baffle 1.

[0038] Optionally, the input shaft 6 has a three-stage stepped hole with decreasing diameter starting from the end. The first-stage hole is clearance-fitted with the oil passage baffle 1. The second-stage stepped hole has an internal thread that mates with the screw 3. The third-stage stepped hole (i.e., the axial oil passage hole 9) has only a tapered plug 4. The tapered plug 4 is an internal hexagonal tapered plug. The tapered plug 4 is interference-fitted into the axial oil passage hole 9.

[0039] This utility model also provides a rotating shaft, including the aforementioned rotating input shaft lubrication and sealing structure. Because this rotating shaft employs the aforementioned lubrication and sealing structure, it possesses excellent lubrication and sealing performance, as well as a compact and reasonable structural design. This enables efficient lubrication and smooth oil return, and precisely coordinates assembly stress and sealing pressure, preventing localized overload and seal failure, thereby reducing the failure rate of the transmission system and extending its service life. Under high-speed rotation conditions, this rotating shaft ensures a long-lasting and stable lubrication effect while effectively suppressing leakage. Its application not only improves the stability and reliability of equipment operation but also effectively reduces operating and maintenance costs, providing strong support for improving production efficiency.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the technical solution of the present utility model in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present utility model, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A rotary input shaft lubrication and sealing structure, characterized in that, The device includes an input flange fitted onto the end of an input shaft. The interior of the input flange has several stepped holes along the axial direction of the input shaft. An oil passage baffle is fitted within the stepped holes with clearance. The oil passage baffle is connected to the end of the input shaft by screws. The oil passage baffle has a stepped structure and is fitted with the end of the input shaft with clearance. An O-ring is provided in the gap formed by the oil passage baffle, the input shaft, and the input flange.

2. The rotary input shaft lubrication and sealing structure according to claim 1, characterized in that, The cross-sectional area ratio of the O-ring is greater than 7.5%.

3. The rotary input shaft lubrication and sealing structure according to claim 1, characterized in that, The input flange has four stepped holes along the axial direction of the input shaft inside, and the diameter of the stepped holes decreases step by step from the end face of the input flange to the direction of the input shaft. The oil passage baffle is clearance fitted with the inner wall of the second stepped hole starting from the end face of the input flange.

4. The rotary input shaft lubrication and sealing structure according to claim 3, characterized in that, The third-stage stepped hole, starting from the end face of the input flange, forms an annular sealing space with the end faces of the input shaft and the oil circuit baffle, and the O-ring is set in the annular sealing space.

5. The rotary input shaft lubrication and sealing structure according to claim 1, characterized in that, The input shaft and the input flange are connected by a spline.

6. The rotary input shaft lubrication and sealing structure according to claim 5, characterized in that, The input shaft is provided with an oil passage hole structure.

7. The rotary input shaft lubrication and sealing structure according to claim 6, characterized in that, The oil passage structure includes a radial oil passage arranged radially along the input shaft and an axial oil passage arranged axially along the input shaft, and the radial oil passage and the axial oil passage are interconnected.

8. The rotary input shaft lubrication and sealing structure according to claim 7, characterized in that, The radial oil passage is located between the screw and the spline, and connects the gap between the input flange and the input shaft to form a lubrication channel for the spline.

9. The rotary input shaft lubrication and sealing structure according to claim 8, characterized in that, A tapered plug is provided at the end of the screw corresponding to the position of the axial oil passage hole, which is used to seal the axial oil passage hole.

10. A rotating shaft, characterized in that, Includes the rotary input shaft lubrication and sealing structure as described in any one of claims 1-9.

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