A high-reliability bearing lubrication device for an elevator unit gear box

Abstract

The utility model relates to a high reliable bearing lubricating device of lifting unit gear box, including box, output gear shaft, rear bearing seat, self aligning bearing and torque sensor, and the inner ring of self aligning bearing is limited through oil seal cover, and the oil seal cover is fixed in the shaft end part of output gear shaft, and the inner transparent cover is equipped with the inner side oil seal between output gear shaft, and the outer transparent cover is equipped with the outer side oil seal between output gear shaft, and is equipped with oil injection hole and oil discharge hole on rear bearing seat, and the inner export end of oil injection hole is equipped with annular groove, and the annular groove corresponds the oil injection hole on the outer ring of self aligning bearing, and the inner import end of oil discharge hole is close to the inner end face of self aligning bearing, and is communicated with the sealed space of self aligning bearing. The utility model has oil seal on the left side and the right side of rear bearing seat, makes the grease in a relatively closed space, and oil injection hole and oil discharge hole form the circuit and make the grease enter and discharge conveniently, and the grease does not overflow into torque sensor, and the bearing grease amount can be controlled, and does not need to open transparent cover to observe the grease condition when maintaining.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a highly reliable bearing lubrication device for a lifting unit gearbox. Background Technology

[0002] The high-ratio, low-speed, heavy-duty lifting unit gearbox is a key load-bearing component for lifting equipment on offshore platforms. Lifting is achieved through the meshing of a rack and pinion with the output climbing gear shaft of the lifting unit gearbox. To measure the output torque of the lifting unit gearbox and prevent overload, a torque sensor is typically installed at the end of the output gear shaft. The output gear shaft is rotatably mounted on a rear bearing housing via a self-aligning bearing. The output gear shaft drives the torque sensor to rotate synchronously, thereby measuring the output torque. To ensure smooth operation of the self-aligning bearing, it needs to be grease-lubricated. Figure 1 As shown, conventional grease lubrication is used, with only two symmetrical oil inlets on the rear bearing housing. Grease is added through either inlet, and the grease flows into the self-aligning bearing through the annular groove of the rear bearing housing. This structure has the following defects: 1. When lubricating the self-aligning bearing in the rear bearing housing, there is an oil seal on the right side to seal the grease, but there is no oil seal on the left side, so the grease will flow into the torque sensor and cause the sensor reading to be incorrect. 2. The amount of grease cannot be controlled when adding lubricant; 3. The lubricating oil condition cannot be observed during use; the transparent cover must be removed to see the lubrication status, making maintenance very troublesome. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a highly reliable bearing lubrication device for a lifting unit gearbox. The self-aligning bearing grease in the rear bearing housing will not overflow into the torque sensor, the amount of bearing grease can be controlled, and there is no need to open the transparent cover to observe the grease condition during maintenance.

[0004] The purpose of this utility model is achieved as follows: A highly reliable bearing lubrication device for a lifting unit gearbox includes a housing, an output gear shaft, a rear bearing housing, a self-aligning bearing, and a torque sensor. The housing contains a multi-stage planetary gear train, with the last stage connected to the output gear shaft. A torque sensor is located at the end of the output gear shaft. The output gear shaft is connected to the rear bearing housing via the self-aligning bearing. An inner cover and an outer cover are connected to the inner and outer sides of the rear bearing housing, respectively. The inner ring of the self-aligning bearing is limited by an oil seal sleeve, which is fixed to the end of the output gear shaft. An inner oil seal is provided between the inner cover and the output gear shaft, and an outer oil seal is provided between the outer cover and the output gear shaft. The inner and outer oil seals are respectively located on the inner and outer sides of the self-aligning bearing, forming a sealed space. The rear bearing housing has an oil injection hole and an oil drain hole. The inner outlet end of the oil injection hole has an annular groove corresponding to the built-in oil injection hole on the outer ring of the self-aligning bearing. The inner inlet end of the oil drain hole is close to the inner end face of the self-aligning bearing and communicates with the sealed space containing the self-aligning bearing.

[0005] Preferably, the outer transparent cover is provided with an exhaust hole.

[0006] Preferably, one end of the vent hole is connected to the sealed space where the self-aligning bearing is located, and the other end is sealed by a screw plug.

[0007] Preferably, the vent is located radially outside the outer oil seal.

[0008] Preferably, both the outer inlet end of the oil injection hole and the outer outlet end of the oil discharge hole are provided with oil cups.

[0009] Preferably, the outer transparent cover has a clearance notch corresponding to the oil cup.

[0010] Preferably, the end of the output gear shaft is provided with a positioning stop corresponding to the oil seal sleeve.

[0011] The beneficial effects of this utility model are: The oil drain port on the rear bearing housing allows for easy observation of the grease level, preventing workers from continuously adding grease into the rear bearing housing and wasting grease. There are oil seals on both the left and right sides of the rear bearing housing. The grease is in a relatively sealed space, which extends the service life of the grease, reduces the frequency of maintenance, and prevents the grease from overflowing into the torque sensor, thus ensuring the accurate reading of the torque sensor. When performing grease maintenance, there is no need to completely remove the cover. Simply add new grease directly into the oil filling hole of the rear bearing housing. Unscrew the plug and the oil cup at the drain hole, and observe the grease condition to determine whether the old grease has been drained, which greatly benefits the bearing life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the lubrication structure of the tail bearing of the gearbox in the lifting unit in the prior art.

[0013] Figure 2 This is a schematic diagram of a highly reliable bearing lubrication device for a lifting unit gearbox according to the present invention.

[0014] Figure 3 for Figure 2 AA sectional view.

[0015] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0016] Figure 5 for Figure 2 BB cross-sectional view.

[0017] Figure 6 for Figure 5 A magnified view of section I in the middle.

[0018] Figure 7 for Figure 5 A magnified view of a section at point II.

[0019] in: 1. Housing; 2. Output gear shaft; 3. Rear bearing seat; 3.1. Oil injection hole; 3.1.1. Annular groove; 3.2. Oil drain hole; 4. Self-aligning bearing; 5. Torque sensor; 6. Inner transparent cover; 7. Outer transparent cover; 7.1. Vent hole; 7.2. Circumvention notch; 8. Oil seal sleeve; 9. Inner oil seal; 10. Outer oil seal; 11. Screw plug; 12. Oil cup. Detailed Implementation

[0020] See Figure 2-7 This utility model relates to a highly reliable bearing lubrication device for a lifting unit gearbox, comprising a housing 1, an output gear shaft 2, a rear bearing housing 3, a self-aligning bearing 4, and a torque sensor 5. The housing 1 contains a multi-stage planetary gear train, with the final stage planetary gear train connected to the output gear shaft 2. The torque sensor 5 is located at the end of the output gear shaft 2. The output gear shaft 2 is connected to the rear bearing housing 3 via the self-aligning bearing 4. An inner cover 6 and an outer cover 7 are respectively connected to the inner and outer sides of the rear bearing housing 3. The rear bearing housing 3, the inner cover 6, and the outer cover 7 are bolted together. The inner ring of the self-aligning bearing 4 is limited by an oil seal sleeve 8, which is fixed to the end of the output gear shaft 2. An inner oil seal 9 is provided between the inner cover 6 and the output gear shaft 2, and an outer oil seal 10 is provided between the outer cover 7 and the output gear shaft 2. The inner oil seal 9 and the outer oil seal 10 are respectively provided on the inner and outer sides of the self-aligning bearing 4, so that the grease is in a relatively sealed space, which can extend the service life of the grease, reduce the frequency of maintenance, and prevent the grease from overflowing into the torque sensor 5, thus ensuring the correct reading of the torque sensor 5.

[0021] The outer transparent cover 7 is provided with an exhaust hole 7.1. One end of the exhaust hole 7.1 is connected to the sealed space where the self-aligning bearing 4 is located, and the other end of the exhaust hole 7.1 is sealed by a screw plug 11. The exhaust hole 7.1 is located radially outside the outer oil seal 10, thus avoiding the outer oil seal 10.

[0022] The rear bearing housing 3 is provided with an oil injection hole 3.1 and an oil drain hole 3.2. The outer inlet end of the oil injection hole 3.1 and the outer outlet end of the oil drain hole 3.2 are both provided with oil cups 12. The inner outlet end of the oil injection hole 3.1 is provided with an annular groove 3.1.1. The annular groove 3.1.1 corresponds to the built-in oil injection hole on the outer ring of the self-aligning bearing 4. The built-in oil injection hole is usually located at the center position of the self-aligning bearing in the axial direction. The inner inlet end of the oil drain hole 3.2 is located inside the self-aligning bearing 4 and communicates with the sealed space where the self-aligning bearing 4 is located. The oil injection hole 3.1 and the oil drain hole 3.2 form a circuit to facilitate the entry and exit of grease.

[0023] The outer cover 7 has a clearance notch 7.2 corresponding to the oil cup 12, so that the oil cup set on the rear bearing seat 3 is exposed.

[0024] The output gear shaft 2 has a positioning stop corresponding to the oil seal sleeve 8 at its end to ensure that the oil seal sleeve 8 and the output gear shaft 2 are concentric.

[0025] Working principle: Oil is introduced into the rear bearing housing through the oil cup at the outer end of the oil filling hole. Simultaneously, the screw plug and the oil cup at the outer end of the oil drain hole are opened to expel air from inside the self-aligning bearing. Grease flows through the annular groove into the rollers on both sides of the self-aligning bearing. When grease is discharged from the screw plug hole, tighten the screw plug. Continue injecting grease into the rear bearing housing until grease is discharged from the oil drain hole, indicating that both sides of the self-aligning bearing are full of grease. At this point, grease injection can be stopped, and the oil cup is tightened to complete the grease injection. This process prevents grease overflow and controls the amount of grease added. By observing the grease at the drain and oil drain ports, the quality of grease lubrication in the rear bearing housing can be visually assessed.

[0026] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A highly reliable bearing lubrication device for a lifting unit gearbox, comprising a housing, an output gear shaft, a rear bearing housing, a self-aligning bearing, and a torque sensor. The housing contains a multi-stage planetary gear train, the last stage of which is connected to the output gear shaft. A torque sensor is located at the end of the output gear shaft. The output gear shaft is connected to the rear bearing housing via the self-aligning bearing. An inner cover and an outer cover are respectively connected to the inner and outer sides of the rear bearing housing. The device is characterized in that: The inner ring of the self-aligning bearing is limited by an oil seal sleeve, which is fixed to the end of the output gear shaft. An inner oil seal is provided between the inner cover and the output gear shaft, and an outer oil seal is provided between the outer cover and the output gear shaft. The inner and outer oil seals are respectively provided on the inner and outer sides of the self-aligning bearing to form a sealed space. The rear bearing housing is provided with an oil injection hole and an oil drain hole. The inner outlet end of the oil injection hole is provided with an annular groove, which corresponds to the built-in oil injection hole on the outer ring of the self-aligning bearing. The inner inlet end of the oil drain hole is close to the inner end face of the self-aligning bearing and communicates with the sealed space where the self-aligning bearing is located.

2. The high-reliability bearing lubrication device for a lifting unit gearbox according to claim 1, characterized in that: The outer transparent cover is provided with an exhaust hole.

3. A highly reliable bearing lubrication device for a lifting unit gearbox according to claim 2, characterized in that: One end of the vent is connected to the sealed space where the self-aligning bearing is located, and the other end is sealed by a screw plug.

4. A highly reliable bearing lubrication device for a lifting unit gearbox according to claim 2 or 3, characterized in that: The vent is located radially outside the outer oil seal.

5. A highly reliable bearing lubrication device for a lifting unit gearbox according to claim 1, characterized in that: Both the outer inlet end of the oil injection hole and the outer outlet end of the oil discharge hole are equipped with oil cups.

6. A highly reliable bearing lubrication device for a lifting unit gearbox according to claim 5, characterized in that: The outer transparent cover has a clearance notch corresponding to the oil cup.

7. A highly reliable bearing lubrication device for a lifting unit gearbox according to claim 1, characterized in that: The output gear shaft end is provided with a positioning stop corresponding to the oil seal sleeve.

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