A speed reducer bearing seal structure

Abstract

The application relates to the technical field of sealing structures, and discloses a speed reducer bearing sealing structure, which comprises a first protective shell, the outer side wall of the first protective shell is provided with a lug, one end of the first protective shell is connected with a second protective shell, the first protective shell and the second protective shell jointly enclose a containing cavity, a bearing mounting shell is assembled in the containing cavity, an annular mounting groove is formed in the inner wall of the bearing mounting shell, a sealing piece support framework is fixed in the mounting groove, the first protective shell and the second protective shell form double-layer protection, the lug is integrally formed with the first protective shell and extends in the radial direction, the force receiving area is enlarged, the mounting and fixing effect is strengthened, and the loosening of the shell caused by vibration is avoided; the connecting blocks are evenly distributed along the circumference of the mounting groove, the sealing piece support framework is subjected to force dispersion, the precision of coaxial positioning is ensured, and the sealing assembly is prevented from deviating.

Description

Technical Field

[0001] This application relates to the field of sealing structure technology, and in particular to a sealing structure for a gearbox bearing. Background Technology

[0002] As a core component of industrial transmission systems, the operating stability of the bearing assembly in a speed reducer directly determines the overall efficiency and service life of the machine. During high-speed operation, bearings rely on lubricating media to reduce frictional loss and must also be protected against external impurities such as dust, moisture, and oil. Therefore, the sealing performance and structural stability of the bearing sealing structure are crucial technical aspects for ensuring the reliable operation of the speed reducer.

[0003] Existing gearbox bearing sealing structures generally suffer from several technical defects, making them unsuitable for use under complex operating conditions: First, the outer protective structure design is unreasonable. Most sealing structures use only a single shell for protection, lacking a combined protective design. This not only limits the protection effect on the internal sealing components, but also allows external impurities to easily penetrate the shell gap and contact the bearing components. Furthermore, the shell itself has poor installation stability and is prone to displacement or loosening under the vibration transmission of the gearbox. Second, the installation and fixing methods of the sealing components are inadequate. The sealing skeleton is mostly installed as a whole on the inner wall of the bearing housing without a dedicated positioning connection structure. Under the high-frequency vibration generated by the bearing operation, the sealing skeleton is prone to displacement or eccentricity, resulting in a decrease in the fitting accuracy between the sealing lip and the rotating parts of the bearing, which in turn leads to seal failure. Utility Model Content

[0004] The technical solution for a gearbox bearing sealing structure provided in this application is as follows:

[0005] A reducer bearing sealing structure includes a first protective shell with a protruding lug on its outer side wall. A second protective shell is connected to one end of the first protective shell, and the first and second protective shells together form a receiving cavity. A bearing mounting shell is assembled inside the receiving cavity. An annular mounting groove is formed on the inner wall of the bearing mounting shell. A sealing element support frame is fixed in the mounting groove. The outer side wall of the sealing element support frame is fixedly connected to the groove wall of the mounting groove through at least two connecting blocks. A main sealing lip is connected to the inner side wall of the sealing element support frame, and an auxiliary sealing ring is sandwiched at the connection position between the sealing element support frame and the main sealing lip. At least two sealing partitions are spaced apart along the axial direction inside the bearing mounting shell, and the outer side wall of each sealing partition abuts against the inner wall of the bearing mounting shell.

[0006] Preferably, the lug and the first protective shell are integrally formed, and the lug extends outward along the radial direction of the first protective shell.

[0007] Preferably, the connecting blocks are evenly spaced along the circumference of the mounting groove, and one end of the connecting block is fixedly connected to the groove wall of the mounting groove, while the other end is fixedly connected to the outer wall of the sealing element support frame.

[0008] Preferably, the auxiliary sealing ring is sleeved on the outer wall of the sealing element support frame, and one side of the auxiliary sealing ring is in contact with the root of the main sealing lip, and the other side is in contact with the groove wall of the mounting groove.

[0009] Preferably, the sealing separator is an annular plate structure, the spacing between two adjacent sealing separators is equal, and the edge of each sealing separator is in sealed contact with the inner wall of the bearing mounting housing.

[0010] In summary, this application includes the following beneficial technical effects:

[0011] 1. The first protective shell and the second protective shell form a double layer of protection. The integrated molding and radial extension design of the support lug and the first protective shell expand the stress area and enhance the installation and fixing effect, avoiding the loosening of the shell caused by vibration. The connecting blocks are evenly distributed around the mounting groove, so that the force on the sealing support skeleton is distributed, ensuring the accuracy of its coaxial positioning and preventing the sealing components from shifting.

[0012] 2. The main sealing lip and the auxiliary sealing ring form a double seal, filling the gap at the root of the sealing lip and preventing media leakage and impurity intrusion; the two annular sealing separators divide the inside of the bearing housing into independent spaces, blocking the disorderly flow of lubricating media, and the uniform spacing design balances the sealing pressure, further improving the sealing reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the first protective shell structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the bearing mounting housing structure of this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. First protective shell; 101. Support lug; 102. Second protective shell; 2. Bearing mounting shell; 3. Mounting groove; 301. Connecting block; 302. Seal support frame; 303. Main sealing lip; 304. Auxiliary sealing ring; 4. Sealing separator. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Reference Figure 1-3 This utility model provides a gear reducer bearing sealing structure, including a first protective shell 1, with a support lug 101 protruding from the outer side wall of the first protective shell 1, and a second protective shell 102 connected to one end of the first protective shell 1. The first protective shell 1 and the second protective shell 102 together form a receiving cavity, in which a bearing mounting shell 2 is assembled. An annular mounting groove 3 is opened on the inner wall of the bearing mounting shell 2, and a sealing element support frame 302 is fixed in the mounting groove 3. The outer side wall of the sealing element support frame 302 is fixedly connected to the groove wall of the mounting groove 3 through at least two connecting blocks 301. A main sealing lip 303 is connected to the inner side wall of the sealing element support frame 302, and an auxiliary sealing ring 304 is sandwiched at the connection position between the sealing element support frame 302 and the main sealing lip 303. At least two sealing partitions 4 are arranged axially at intervals inside the bearing mounting shell 2, and the outer side wall of each sealing partition 4 abuts against the inner wall of the bearing mounting shell 2.

[0020] The cavity formed by the first protective shell 1 and the second protective shell 102 provides an outer layer of protection for the internal structure, preventing external impurities from directly contacting the internal components. The bearing mounting shell 2 is used to support the bearing of the reducer. The vibration and stress generated by the bearing operation are transmitted to the inner wall of the cavity through the bearing mounting shell 2. The mounting groove 3 provides installation space for the sealing assembly. The sealing support frame 302 is held in a fixed position in the mounting groove 3 by at least two connecting blocks 301 to prevent the sealing assembly from shifting when the bearing is running. The main sealing lip 303 fits against the rotating parts of the bearing, preventing the bearing lubricating medium from leaking outward, and also preventing external dust and moisture from entering the bearing area. The auxiliary sealing ring 304 fills the gap in the area where the sealing support frame 302 and the main sealing lip 303 are connected. At least two sealing partitions 4 are distributed axially at intervals inside the bearing mounting shell 2, dividing the interior of the bearing mounting shell 2 into multiple independent spaces, further preventing medium leakage and impurity intrusion.

[0021] In a preferred embodiment, the lug 101 and the first protective shell 1 are integrally formed, and the lug 101 extends outward along the radial direction of the first protective shell 1.

[0022] When the reducer is installed and fixed, the support lug 101 and the first protective shell 1 are integrally formed. When the external fastener is connected to the support lug 101, the force can be directly transmitted to the first protective shell 1. Furthermore, the support lug 101 extends outward along the radial direction of the first protective shell 1, which expands the contact area of ​​the force-bearing structure, so that the first protective shell 1 maintains a stable installation state during the operation of the reducer and avoids loosening of the installation due to vibration.

[0023] In a preferred embodiment, the connecting blocks 301 are evenly spaced along the circumference of the mounting groove 3, and one end of the connecting block 301 is fixedly connected to the groove wall of the mounting groove 3, and the other end is fixedly connected to the outer wall of the sealing support frame 302.

[0024] When the reducer is running, the vibration of the bearing is transmitted to the bearing mounting housing 2, and then acts on the mounting groove 3. The connecting blocks 301 are evenly distributed around the circumference of the mounting groove 3, so that the force on the sealing support frame 302 is evenly distributed to the groove wall of the mounting groove 3, avoiding deformation of the sealing support frame 302 due to local force concentration. At the same time, the two ends of the connecting blocks 301 are fixed to the groove wall of the mounting groove 3 and the outer wall of the sealing support frame 302, respectively, to maintain the coaxial position of the sealing support frame 302 in the mounting groove 3, and ensure the fitting accuracy between the main sealing lip 303 and the rotating parts of the bearing.

[0025] In a preferred embodiment, the auxiliary sealing ring 304 is sleeved on the outer wall of the sealing support frame 302, and one side of the auxiliary sealing ring 304 is in contact with the root of the main sealing lip 303, and the other side is in contact with the groove wall of the mounting groove 3.

[0026] When the reducer is running, the main sealing lip 303 deforms slightly with the rotating bearing components, and a gap is easily generated at the connection position between its root and the sealing support frame 302; the auxiliary sealing ring 304 is sleeved on the outer wall of the sealing support frame 302, one side of which fits against the root of the main sealing lip 303 to fill the gap at the root of the main sealing lip 303, and the other side fits against the groove wall of the mounting groove 3 to prevent the medium or impurities from passing through the gap between the mounting groove 3 and the sealing support frame 302.

[0027] In a preferred embodiment, the sealing separator 4 is an annular plate structure, the spacing between two adjacent sealing separators 4 is equal, and the edge of each sealing separator 4 is sealed and fitted to the inner wall of the bearing mounting housing 2.

[0028] When the reducer is running, the bearing lubricating medium may flow along the inner wall of the bearing mounting housing 2. The sealing partition 4 is an annular plate structure, and its edge is sealed and fitted with the inner wall of the bearing mounting housing 2, dividing the interior of the bearing mounting housing 2 into multiple independent spaces, thus blocking the flow path of the lubricating medium. At the same time, the distance between two adjacent sealing partitions 4 is equal, so that the sealing pressure of each partition space is uniform, avoiding the sealing failure caused by excessive pressure in a local space.

[0029] The foregoing description, with reference to preferred embodiments, illustrates an exemplary implementation of a gearbox bearing sealing structure provided by this disclosure. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A gearbox bearing sealing structure, comprising a first protective shell (1), characterized in that: The outer side wall of the first protective shell (1) is provided with a lug (101). One end of the first protective shell (1) is connected to a second protective shell (102). The first protective shell (1) and the second protective shell (102) together form a receiving cavity. A bearing mounting shell (2) is assembled in the receiving cavity. An annular mounting groove (3) is opened on the inner wall of the bearing mounting shell (2). A sealing element support frame (302) is fixed in the mounting groove (3). The outer side wall of the sealing element support frame (302) passes through to... Two connecting blocks (301) are fixedly connected to the groove wall of the mounting groove (3). The inner side wall of the sealing element support frame (302) is connected to the main sealing lip (303), and an auxiliary sealing ring (304) is clamped at the connection position between the sealing element support frame (302) and the main sealing lip (303). At least two sealing partitions (4) are arranged axially in the interior of the bearing mounting shell (2), and the outer side wall of each sealing partition (4) abuts against the inner wall of the bearing mounting shell (2).

2. The gearbox bearing sealing structure according to claim 1, characterized in that: The lug (101) and the first protective shell (1) are integrally formed, and the lug (101) extends outward along the radial direction of the first protective shell (1).

3. The gearbox bearing sealing structure according to claim 1, characterized in that: The connecting blocks (301) are evenly spaced along the circumference of the mounting groove (3), and one end of the connecting block (301) is fixedly connected to the groove wall of the mounting groove (3), and the other end is fixedly connected to the outer wall of the sealing support frame (302).

4. The gearbox bearing sealing structure according to claim 1, characterized in that: The auxiliary sealing ring (304) is sleeved on the outer wall of the sealing support frame (302), and one side of the auxiliary sealing ring (304) is in contact with the root of the main sealing lip (303), and the other side is in contact with the groove wall of the mounting groove (3).

5. The gearbox bearing sealing structure according to claim 1, characterized in that: The sealing separator (4) is an annular plate structure, the spacing between two adjacent sealing separators (4) is equal, and the edge of each sealing separator (4) is sealed and fitted to the inner wall of the bearing mounting shell (2).

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