Sealing structure of gear shaft of gearbox

Abstract

The utility model provides a sealing structure of a gear shaft of a gear box, which comprises a shaft sleeve arranged at the extending end of the gear shaft, an oil storage cavity is arranged in the shaft sleeve, the bottom of the shaft sleeve is connected with an oil return pipe and communicated with an oil return port on a box seat through a hose, and leaked lubricating oil is recycled. A sealing ring and a felt ring are arranged at one end of the shaft sleeve to form primary and secondary sealing defense lines to prevent lubricating oil from leaking along the shaft; a sliding ejector rod is arranged on one side of the shaft sleeve, an arc-shaped oil scraping plate is fixed to the end of the ejector rod, and the oil scraping plate is attached to the surface of the gear shaft and can scrape attached lubricating oil into the oil storage cavity. The ejector rod is sleeved with a spring, and pre-tightening force is provided to guarantee that the oil scraping plate is attached to the gear shaft all the time. Through multiple sealing, active oil scraping and lubricating oil recycling mechanisms, the sealing reliability is effectively improved, the risk of lubricating oil leakage is reduced, and the shaft end sealing device has the advantages of being compact in structure, convenient to maintain, environmentally friendly, capable of saving energy and the like and is suitable for shaft end sealing application of various industrial gearboxes.

Description

Technical Field

[0001] This utility model relates to the field of gearboxes, and more specifically to a sealing structure for a gearbox gear shaft. Background Technology

[0002] Gearboxes, as commonly used transmission devices in mechanical equipment, are widely used in industrial machinery, automobiles, wind power generation, and other fields. During gearbox operation, the gear shaft usually needs to extend outside the gearbox housing to connect with other components. Therefore, a sealing structure must be installed between the gear shaft and the gearbox housing to prevent lubricating oil leakage and to prevent external dust, moisture, and other impurities from entering the gearbox housing and affecting the normal operation of the equipment.

[0003] Currently, common gear shaft sealing methods mainly employ packing seals, lip seals, or mechanical seals. Among these, lip seals are widely used due to their simple structure and ease of installation. However, traditional sealing structures have the following drawbacks:

[0004] Limited seal life: During long-term operation, the seal ring is prone to failure due to wear, aging or softening at high temperature, causing lubricating oil to seep out along the axial direction, resulting in environmental pollution and increased maintenance costs.

[0005] Lack of secondary protection mechanism: Once the main seal fails, the lubricating oil will leak directly into the external environment, and there is a lack of effective collection and recycling methods. Utility Model Content

[0006] The main objective of this invention is to provide a sealing structure for the gear shaft of a gearbox, thereby solving the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a gear shaft that drives between the housing and the housing cover is included, a bushing is fitted on one end of the gear shaft that extends out of the housing, the bushing is fixed on the bearing seat, a sealing ring is provided between one end of the bushing and the bearing seat, and a felt ring is provided at the other end of the bushing, with the sealing ring and the felt ring abutting against the gear shaft.

[0008] The bushing has an oil storage cavity inside, and an oil return pipe connected to the cavity is located at the bottom of the bushing. The oil return pipe is connected to the oil return port on the housing via a hose.

[0009] Preferably, the bushing has grooves inside both ends, and the outer sides of the sealing ring and the felt ring abut against the grooves, while the inner sides abut against the gear shaft.

[0010] Preferably, the gear shaft rotates against the bearing housing via a bearing, with one end of the bearing abutting against the inner step of the bearing housing and the other end fixed by a bearing locking sleeve on the gear shaft.

[0011] Preferably, the end of the bushing is fixedly connected to the bearing housing by multiple bolts, and a sealing ring or sealant is provided between the bushing and the bearing housing.

[0012] Preferably, a sliding push rod is provided on one side of the bushing, and an oil scraper is fixed at the end of the push rod. The oil scraper is arc-shaped, and the arc-shaped end of the oil scraper abuts against the gear shaft.

[0013] Preferably, a spring is fitted on the push rod, with one end of the spring abutting against the oil scraper and the other end abutting against the bushing;

[0014] Multiple sealing rings are provided between the push rod and the bushing.

[0015] This utility model provides a sealing structure for the gear shaft of a gearbox, with the following advantages:

[0016] 1. The sealing ring and felt ring form a second line of defense, effectively preventing lubricating oil leakage. Even when the sealing ring fails, the bushing can still collect leaked lubricating oil, preventing direct leakage and greatly extending the service life of the overall sealing system.

[0017] 2. Under the action of the spring, the scraper blade always keeps a tight fit against the gear shaft, which can promptly remove lubricating oil droplets or oil films adhering to its surface and prevent lubricating oil from leaking along the axial direction. This active scraping mechanism not only reduces the possibility of lubricating oil leakage, but also reduces the risk of seal wear caused by oil film.

[0018] 3. Leaked or scraped lubricating oil can return to the housing through the oil reservoir inside the bushing and the return pipe / hose, avoiding lubricating oil waste and environmental pollution. The recovery system is simple and compact in design, easy to install and maintain, and has a good guiding effect on the flow of lubricating oil, ensuring effective lubricating oil recovery. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is an isometric view of the overall structure of this utility model;

[0021] Figure 2 This is a utility model Figure 1 Front sectional view at the shaft of the intermediate gear;

[0022] Figure 3 This is a utility model Figure 2 Enlarged view a;

[0023] Figure 4 This is a utility model Figure 3 Another magnified view from a different direction;

[0024] In the diagram: 1. Housing base; 2. Housing cover; 3. Gear shaft; 4. Bushing; 5. Hose; 6. Oil return port; 7. Bearing housing; 8. Oil return pipe; 9. Sealing ring; 10. Felt ring; 11. Bearing locking sleeve; 12. Bearing; 13. Push rod; 14. Spring; 15. Oil scraper. Detailed Implementation

[0025] like Figures 1-4 As shown, a sealing structure for a gearbox gear shaft includes a gear shaft 3 that drives between a housing 1 and a housing cover 2. A bushing 4 is fitted on one end of the gear shaft 3 that extends out of the housing 1. The bushing 4 is fixed on a bearing seat 7. A sealing ring 9 is provided between one end of the bushing 4 and the bearing seat 7. A felt ring 10 is provided at the other end of the bushing 4. The sealing ring 9 and the felt ring 10 abut against the gear shaft 3.

[0026] The bushing 4 has an oil storage cavity inside, and the bottom of the bushing 4 has an oil return pipe 8 that communicates with the cavity. The oil return pipe 8 is connected to the oil return port 6 on the housing 1 through a hose 5.

[0027] When the gearbox is in operation, the sealing ring on the gear shaft 3 will fail after a long period of operation, causing lubricating oil to leak and splash out along the gear shaft 3. The installed bushing 4 can provide secondary protection outside the sealing ring. The leaked lubricating oil enters the oil storage cavity inside the bushing 4 and enters the gearbox base 1 through the bottom oil return pipe 8 and the hose 5, which can promptly return the leaked lubricating oil to the gearbox base 1 and prevent lubricating oil leakage.

[0028] Preferably, the bushing 4 has grooves inside both ends, and the outer sides of the sealing ring 9 and the felt ring 10 abut against the grooves, while the inner sides abut against the gear shaft 3.

[0029] The sealing ring 9 should be made of wear-resistant, high-temperature-resistant, and corrosion-resistant materials, such as fluororubber or polytetrafluoroethylene (PTFE), to extend its service life. The felt ring 10 should have good oil absorption and elasticity to effectively absorb minor leaks of lubricating oil.

[0030] The sealing ring 9 and the felt ring 10 are fixed in the slots at both ends of the bushing 4, which can achieve the sealing of the oil storage cavity inside the bushing 4. After the sealing ring 9 fails, the lubricating oil enters the oil storage cavity, and the leaked lubricating oil can be returned to the housing 1 in time.

[0031] Preferably, the gear shaft 3 rotates against the bearing housing 7 via the bearing 12, with one end of the bearing 12 abutting against the inner step of the bearing housing 7 and the other end fixed by the bearing locking sleeve 11 on the gear shaft 3.

[0032] The end of the bushing 4 is fixedly connected to the bearing housing 7 by multiple bolts, and a sealing ring or sealant is provided between the bushing 4 and the bearing housing 7.

[0033] Preferably, a sliding push rod 13 is provided on one side of the bushing 4, and an oil scraper 15 is fixed at the end of the push rod 13. The oil scraper 15 is arc-shaped, and the arc-shaped end of the oil scraper 15 abuts against the gear shaft 3.

[0034] The oil scraper 15 rests against the gear shaft 3 and can scrape off the lubricating oil adhering to the gear shaft 3. The scraped lubricating oil drips into the oil storage cavity due to its own weight, thus preventing the lubricating oil from adhering to the gear shaft 3 and leaking.

[0035] A spring 14 is fitted on the push rod 13. One end of the spring 14 abuts against the oil scraper 15, and the other end abuts against the bushing 4.

[0036] Multiple sealing rings are provided between the push rod 13 and the bushing 4. The sealing rings can prevent the leakage of lubricating oil.

[0037] Spring 14 provides a pushing force so that scraper 15 always rests against gear shaft 3.

[0038] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A sealing structure for a gearbox gear shaft, comprising a gear shaft (3) that drives between a housing (1) and a housing cover (2), characterized in that: A bushing (4) is fitted on one end of the gear shaft (3) that extends out of the housing (1). The bushing (4) is fixed on the bearing housing (7). A sealing ring (9) is provided between one end of the bushing (4) and the bearing housing (7). A felt ring (10) is provided at the other end of the bushing (4). The sealing ring (9) and the felt ring (10) abut against the gear shaft (3). The bushing (4) has an oil storage cavity inside, and the bottom of the bushing (4) has an oil return pipe (8) that communicates with the cavity. The oil return pipe (8) is connected to the oil return port (6) on the housing (1) through a hose (5).

2. The sealing structure for a gearbox gear shaft according to claim 1, characterized in that: The bushing (4) has grooves inside both ends. The outer sides of the sealing ring (9) and the felt ring (10) abut against the grooves, and the inner sides abut against the gear shaft (3).

3. The sealing structure for a gearbox gear shaft according to claim 1, characterized in that: The gear shaft (3) rotates against the bearing housing (7) via the bearing (12). One end of the bearing (12) rests against the inner step of the bearing housing (7), and the other end is fixed by the bearing locking sleeve (11) on the gear shaft (3).

4. The sealing structure for a gearbox gear shaft according to claim 1, characterized in that: The end of the bushing (4) is fixedly connected to the bearing housing (7) by multiple bolts. A sealing ring or sealant is provided between the bushing (4) and the bearing housing (7).

5. The sealing structure for a gearbox gear shaft according to claim 1, characterized in that: A sliding push rod (13) is provided on one side of the bushing (4), and an oil scraper (15) is fixed at the end of the push rod (13). The oil scraper (15) is arc-shaped, and the arc-shaped end of the oil scraper (15) abuts against the gear shaft (3).

6. The sealing structure for a gearbox gear shaft according to claim 5, characterized in that: A spring (14) is fitted on the push rod (13). One end of the spring (14) abuts against the oil scraper (15), and the other end abuts against the bushing (4). Multiple sealing rings are provided between the push rod (13) and the bushing (4).

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