A friction-resistant oil seal ring for use in electric hammers

Abstract

This utility model belongs to the field of sealing ring technology, specifically disclosing an anti-friction oil seal ring for electric hammers. It is fitted onto the outside of the electric hammer drive shaft and includes a skeleton and a support body covering the skeleton. The support body includes an outer lip, a connecting lip, and a sealing lip arranged sequentially from the outside to the inside. The sealing lip includes an upper support lip and a lower support lip connected to each other, both of which are located on the connecting lip. This utility model provides an anti-friction oil seal ring for electric hammers, changing the traditional single-layer inner lip body to an upper and lower support lip. The upper support lip forms a rigid support layer to resist axial impact deformation, while the lower support lip constitutes a damping buffer layer to absorb high-frequency vibration energy. Furthermore, the upper and lower support lips form a double sealing surface with the electric hammer drive shaft, effectively reducing the contact area between them and the drive shaft, thereby effectively improving the sealing performance of the oil seal ring.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring technology, and in particular to an anti-friction oil seal ring for use in electric hammers. Background Technology

[0002] The drive shaft of an electric hammer is the core transmission component inside the hammer, responsible for transmitting the rotational power of the electric motor to the actuator (such as the drill bit or hammerhead), thus achieving a combined rotational and impact motion. Its key functions include power transmission, motion conversion (rotation to impact), and torque regulation. Given the crucial role of the drive shaft, its shaft seal is paramount—its core function is to prevent lubricant leakage and the intrusion of external contaminants.

[0003] However, existing oil seals on electric hammer drive shafts have the following drawbacks: During electric hammer drilling operations, the drive shaft operates at high temperatures, high linear speeds, and experiences rapid temperature rise. The currently designed oil seal maintains a tight fit with the shaft throughout the entire process, resulting in an excessively large frictional contact area. Under high-temperature and high-speed operating conditions, this large-area contact causes extremely severe friction between the shaft and the sealing ring, accelerating the wear and damage of the sealing ring and ultimately leading to frequent seal failures.

[0004] In summary, the large contact area between the oil seal and the drive shaft of the electric hammer in the existing technology leads to severe friction, which in turn causes seal failure. Utility Model Content

[0005] This invention provides an anti-friction oil seal ring for electric hammers, which can solve the problem in the prior art where the large contact area between the oil seal and the electric hammer drive shaft leads to severe friction and thus seal failure.

[0006] A friction-resistant oil seal ring for use in electric hammers, fitted onto the outside of the electric hammer drive shaft, includes a skeleton and a support body covering the skeleton; The support body includes an outer lip, a connecting lip, and a sealing lip arranged sequentially from the outside to the inside. The sealing lip includes an upper support lip and a lower support lip connected to each other, and both the upper support lip and the lower support lip are located on the connecting lip.

[0007] Furthermore, the free ends of the upper and lower supporting lips both extend inward at an inward angle, and the inward extension directions of the free ends of the upper and lower supporting lips are opposite.

[0008] Furthermore, a clamping lip is provided on the side of the lower support lip away from the connecting lip body, and the free end of the clamping lip extends outward.

[0009] Furthermore, an elastic element is provided on the outer side of the clamping lip.

[0010] Furthermore, both the upper and lower support lips are located at the lower end of the inner side of the connecting lip.

[0011] Furthermore, an annular groove is provided at the top of the connecting lip.

[0012] Furthermore, the bottom of the outer lip body is provided with an annular flange.

[0013] Furthermore, the skeleton includes an upper ring and a lower ring disposed outside the upper ring; The outer lip and connecting lip respectively cover the outside of the lower ring and the upper ring.

[0014] Furthermore, the connection position between the upper ring and the lower ring is arranged in an arc shape.

[0015] Furthermore, the support is made of fluororubber.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This invention provides an anti-friction oil seal ring for electric hammers, comprising a skeleton and a support body covering the skeleton. The support body consists of an outer lip, a connecting lip, and a sealing lip. Furthermore, the sealing lip includes an upper support lip and a lower support lip connected to each other, thus changing the traditional internal single-layer lip body into an upper and lower support lip. The upper support lip forms a rigid support layer to resist axial impact deformation, while the lower support lip constitutes a damping buffer layer to absorb high-frequency vibration energy. In addition, the upper and lower support lips form a double sealing surface with the electric hammer drive shaft, effectively reducing the contact area between them and the electric hammer drive shaft, thereby effectively improving the sealing performance of the oil seal ring. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A schematic diagram of the assembly structure of an anti-friction oil seal ring and an electric hammer drive shaft for use in electric hammers, provided by this utility model; Figure 2 This utility model provides a structural cross-sectional view of an anti-friction oil seal ring for use in electric hammers.

[0018] Explanation of reference numerals in the attached drawings: 100, drive shaft of electric hammer; 1, support body; 2, skeleton; 11, outer lip body; 12, connecting lip body; 13, sealing lip body; 14, upper support lip; 15, lower support lip; 16, clamping lip; 17, elastic element; 18, annular groove; 19, annular flange; 21, upper ring; 22, lower ring. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0020] like Figures 1 to 2 As shown, the present invention provides an anti-friction oil seal ring for electric hammers. The anti-friction oil seal ring for electric hammers can be sleeved on the outside of the electric hammer drive shaft 100. Specifically, the anti-friction oil seal ring for electric hammers includes a skeleton 2 and a support body 1 covering the skeleton 2. Support body 1 includes an outer lip body 11, a connecting lip body 12 and a sealing lip body 13 arranged sequentially from the outside to the inside. The sealing lip body 13 includes an upper support lip 14 and a lower support lip 15 connected to each other. The upper support lip 14 and the lower support lip 15 are both provided on the connecting lip body 12. The anti-friction oil seal ring applied to electric hammer has a skeleton 2 enclosed inside the support body 1. Through the tight combination of the support body 1 and the skeleton 2, the overall strength, stability, sealing reliability, durability and installation convenience of the oil seal ring are significantly improved. In addition, the support body 1 includes an outer lip body 11, a connecting lip body 12 and a sealing lip body 13 arranged sequentially from the outside to the inside. The sealing lip body 13 includes an upper support lip 14 and a lower support lip 15 connected to each other. The upper support lip 14 and the lower support lip 15 are both provided on the connecting lip body 12. The outer lip body 11, the connecting lip body 12 and the sealing lip body 13 can be designed as a single piece. The layered structure from the outer lip 11, the connecting lip 12 to the sealing lip 13, and the connecting lip 12 as an intermediate support, provide a good skeleton support for the entire oil seal ring.

[0021] A connecting lip 12 is provided, which acts as a physical separator, effectively isolating the outer lip 11 from the sealing lip 13. When the electric hammer drive shaft 100 inside the sealing lip 13 rotates or vibrates, the stress, strain, and frictional heat generated by the outer lip 11 (which is usually in contact with the external environment or a stationary part) will not be directly transferred to the core sealing lip 13. The connecting lip 12 acts as a "buffer zone" or "stress isolation zone," absorbing most of the external disturbances. Therefore, this structural design can significantly improve the shape stability, dimensional accuracy, and conformability of the sealing lip 13 under dynamic working conditions (rotation, vibration), ensuring that it always maintains the best fit with the internal electric hammer drive shaft 100, avoiding seal failure, abnormal wear, or leakage caused by excessive deformation. In addition, the setting of the connecting lip 12 can reduce local stress concentration and abnormal wear, extending the service life of the oil seal ring.

[0022] In addition, the sealing lip 13 adopts a unique combination structure of upper support lip 14 and lower support lip 15. Both are set on the connecting lip 12 and work together on the internal shaft. These two lips form two independent sealing contact lines (or contact bands) along the axial direction (or radial direction, depending on the specific design). This effectively reduces the contact area with the electric hammer drive shaft while providing two sealing barriers, significantly reducing the risk of overall leakage caused by the failure of a single sealing point, and doubling the sealing reliability.

[0023] Under pressure differential conditions (such as internal pressure being higher than external pressure), the double-lip structure can more effectively impede fluid flow. The pressure action allows one lip (such as the lower support lip 15) to fit more tightly against the shaft, while the other lip (such as the upper support lip 14) serves to assist in sealing and prevent reverse leakage (or vice versa, depending on the pressure direction).

[0024] Finally, the double-lip structure can form a small "maze" chamber, which effectively blocks external dust, mud and water and other contaminants from entering (for the external seal), or prevents internal grease / oil from leaking out, thus improving the oil seal's adaptability to complex working conditions (pressure, contaminants).

[0025] like Figures 1 to 2 As shown, in some embodiments of this utility model, the free ends of the upper support lip 14 and the lower support lip 15 both extend inward at an incline, and the incline extension directions of the free ends of the upper support lip 14 and the lower support lip 15 are opposite. The free ends of the upper support lip 14 and the lower support lip 15 both extend inward at an angle. The inner side can be understood as the center position of the support body 1. Specifically, the free end of the upper support lip 14 is the end of the upper support lip 14 that is away from the connecting lip body 12; similarly, the free end of the lower support lip 15 is the end of the lower support lip 15 that is away from the connecting lip body 12. Furthermore, the free ends of the upper support lip 14 and the lower support lip 15 extend in opposite directions. That is, the free end of the upper support lip 14 can extend inward in an upward direction, and the free end of the lower support lip 15 can extend inward in a downward direction; or the free end of the upper support lip 14 can extend inward in an downward direction, and the free end of the lower support lip 15 can extend inward in an upward direction. With this configuration, the two ends of the vertical cross-section of the upper support lip 14 and the lower support lip 15 are V-shaped. The connecting end of the V-shaped structure is set on the connecting lip body 12, and both ends of the open end of the V-shaped structure are in contact with the electric hammer drive shaft 100. Based on the above configuration, the free ends of the upper support lip 14 and the lower support lip 15 are in contact with the electric hammer drive shaft 100, thereby forming a double seal on the outside of the electric hammer drive shaft 100, which significantly reduces the risk of overall leakage caused by the failure of a single sealing point and enhances the reliability of the seal.

[0026] like Figures 1 to 2 As shown, in some embodiments of this utility model, a clamping lip 16 is also provided on the side of the lower support lip 15 away from the connecting lip body 12, and the free end of the clamping lip 16 extends outward; an elastic element 17 is provided on the outer side of the clamping lip 16. The free end of the clamping lip 16, that is, the end of the clamping lip 16 away from the lower support lip 15, extends outward, that is, the free end of the clamping lip 16 extends towards the outer lip body 11, and there is a certain distance between the clamping lip 16 and the outer lip body 11. During the reciprocating motion of the electric hammer drive shaft 100, there will be a certain sway angle. The setting of this distance is used to ensure that there is a certain amount of deformation at the clamping lip 16 and the outer lip body 11 on the oil seal, thereby improving its shock absorption and buffering capacity, avoiding abnormal wear, and extending the service life of the oil seal. In addition, an elastic element 17 is provided on the outside of the clamping lip 16, that is, the elastic element 17 is sleeved on the outside of the clamping lip 16. The elastic element 17 can be a spring, used to clamp the lower support lip 15 and the clamping lip 16.

[0027] like Figures 1 to 2 As shown, in some embodiments of this utility model, the upper support lip 14 and the lower support lip 15 are both located at the lower end of the inner side of the connecting lip body 12. Since both the upper support lip 14 and the lower support lip 15 are integrally formed and located at the lower end of the inner side of the connecting lip body 12, the upper support lip 14 and the inner side of the connecting lip body 12 form a buffer area; similarly, the lower support lip 15 forms a buffer zone with the connecting lip body 12 and the outer lip body 11, ensuring that after the oil seal ring is installed with the electric hammer drive shaft 100, both the upper support lip 14 and the lower support lip 15 have a certain deformation, effectively avoiding abnormal wear.

[0028] like Figures 1 to 2 As shown, in some embodiments of this utility model, an annular groove 18 is provided on the top of the connecting lip 12; the annular groove 18 is a flexible deformation zone pre-set in the key stress concentration area of ​​the connecting lip 12, and its core function is to solve the risk of structural failure under dynamic working conditions by actively guiding deformation and releasing stress, while improving the adaptability of the sealing system.

[0029] like Figures 1 to 2 As shown, in some embodiments of this utility model, the bottom of the outer lip body 11 is provided with an annular flange 19; the annular flange 19 is used to enhance the structure of the outer lip body 11 and resist its plastic deformation after long-term use.

[0030] like Figures 1 to 2 As shown, in some embodiments of this utility model, the skeleton 2 includes an upper ring 21 and a lower ring 22 disposed outside the upper ring 21; the outer lip body 11 and the connecting lip body 12 respectively cover the outside of the lower ring 22 and the upper ring 21. The connection between the upper ring 21 and the lower ring 22 is arranged in an arc shape; this arc shape effectively disperses stress concentration during operation, greatly reduces the risk of fatigue fracture, and extends the service life of the sealing ring. The upper ring 21 and the lower ring 22 can be connected by integral molding. Since the lower ring 22 is located outside the upper ring 21 and the connection position of the upper ring 21 and the lower ring 22 is set in an arc shape, the upper ring 21, as the lateral extension of the skeleton 2, effectively supports the connecting lip 12 outside it; the lower ring 22, as the vertical guard structure, effectively supports the outer lip 11 outside it.

[0031] like Figures 1 to 2 As shown, in some embodiments of this utility model, the support 1 is made of fluororubber material. The support body 1 is made of fluororubber material and combined with the low-friction sealing lip body 13 structure to reduce the coefficient of friction, thereby effectively improving the sealing performance of the oil seal ring.

[0032] This utility model provides an anti-friction oil seal ring for electric hammers, which includes a skeleton 2 and a support body 1 covering the skeleton 2. The support body 1 is composed of an outer lip 11, a connecting lip 12, and a sealing lip 13. In addition, the sealing lip 13 includes an upper support lip 14 and a lower support lip 15 connected to each other, that is, the traditional internal single-layer lip body is changed to an upper support lip 14 and a lower support lip 15. The upper support lip 14 forms a rigid support layer to resist axial impact deformation, and the lower support lip 15 constitutes a damping buffer layer to absorb high-frequency vibration energy. In addition, the upper support lip 14 and the lower support lip 15 form a double sealing surface with the electric hammer drive shaft 100, effectively reducing the contact area between them and the electric hammer drive shaft 100, thereby effectively improving the sealing performance of the oil seal ring.

[0033] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A friction-resistant oil seal ring for use in electric hammers, fitted onto the outside of the electric hammer drive shaft (100), characterized in that, Includes a skeleton (2) and a support (1) covering the skeleton (2); The support body (1) includes an outer lip body (11), a connecting lip body (12) and a sealing lip body (13) arranged sequentially from the outside to the inside. The sealing lip body (13) includes an upper support lip (14) and a lower support lip (15) connected to each other. The upper support lip (14) and the lower support lip (15) are both located on the connecting lip body (12).

2. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The free ends of the upper support lip (14) and the lower support lip (15) both extend inward at an angle, and the angled extension directions of the free ends of the upper support lip (14) and the lower support lip (15) are opposite.

3. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The lower support lip (15) is provided with a clamping lip (16) on the side away from the connecting lip body (12), and the free end of the clamping lip (16) extends outward.

4. The anti-friction oil seal ring for electric hammers according to claim 3, characterized in that, The outer side of the clamping lip (16) is provided with an elastic element (17).

5. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The upper support lip (14) and the lower support lip (15) are both located at the lower end of the inner side of the connecting lip body (12).

6. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The top of the connecting lip (12) is provided with an annular groove (18).

7. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The bottom of the outer lip (11) is provided with an annular flange (19).

8. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The frame (2) includes an upper ring (21) and a lower ring (22) located outside the upper ring (21); The outer lip (11) and connecting lip (12) respectively cover the outside of the lower ring (22) and the upper ring (21).

9. The anti-friction oil seal ring for electric hammers according to claim 8, characterized in that, The connection position of the upper ring (21) and the lower ring (22) is arranged in an arc shape.

10. The anti-friction oil seal ring for electric hammers according to claim 1, characterized in that, The support (1) is made of fluororubber.

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