High-speed shaft oil leakage prevention structure for construction hoist

Abstract

A high-speed shaft oil leakage prevention structure for construction hoist belongs to the technical field of reduction gearbox. It comprises a box body, a worm and a worm wheel. The worm is engaged with the worm wheel and located above the worm wheel. The worm is installed on a worm shaft. The two ends of the worm shaft are rotatably installed on the box body through the first and second bearings respectively. The high-speed shaft oil leakage prevention structure comprises a first retaining ring and a first oil seal. The first bearing at one end of the worm shaft is pressed against the end cover of the box body through the first retaining ring. The end cover is fixedly installed on the box body. The inner hole of the end cover is provided with an oil seal seat for installing the first oil seal at the end away from the first retaining ring. A first oil return hole is formed in the first retaining ring. When the first retaining ring is installed, the first oil return hole is located below. In the working process, the lubricating oil between the first retaining ring and the first oil seal flows back into the inner cavity of the box body through the first oil return hole and the first bearing under the action of gravity. Advantage: effectively prevents the lubricating oil at the oil seal from overflowing and spreading to other components.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, specifically relating to a high-speed shaft oil leakage prevention structure for construction hoists. Background Technology

[0002] like Figure 1 As shown, in the gearbox structure currently used in construction hoists, the worm 2 is positioned above the worm wheel 3. The worm shaft 4, on which the worm 2 is mounted, is driven by a motor and is a high-speed shaft. This worm shaft 4 is rotatably mounted within the gearbox via a first bearing 6 and a second bearing 7. An oil seal, fitted onto the worm shaft 4, is located on the outer side of either the first bearing 6 or the second bearing 7. Under prolonged high-speed operation, the oil seal may wear. When the oil seal wears, oil leakage occurs. If the lip of the oil seal on the high-speed shaft cannot receive effective lubrication, it will wear rapidly under actual working conditions, leading to oil leakage. When other components (such as a motor) are mounted outside the oil seal, the leaked lubricating oil will affect the normal operation of these other components.

[0003] In view of the aforementioned existing technology, it is necessary to make reasonable improvements to the structure of the gearbox for existing construction hoists. To this end, the applicant has made beneficial designs, and the technical solution described below arises from this background. Utility Model Content

[0004] The objective of this invention is to provide a high-speed shaft oil-proof structure for construction hoists, which can effectively prevent lubricating oil from overflowing from the oil seal and avoid it from spreading to other components.

[0005] The present invention achieves its objective as follows: A high-speed shaft oil-leakage prevention structure for a construction hoist includes a housing, a worm gear, and a worm wheel. The worm gear meshes with the worm wheel, and the worm gear is located above the worm wheel. The worm gear is mounted on a worm shaft, and both ends of the worm shaft are rotatably mounted on the housing via a first bearing and a second bearing, respectively. The high-speed shaft oil-leakage prevention structure includes a first retaining ring and a first oil seal. The first bearing at one end of the worm shaft is pressed against the end cover of the housing via the first retaining ring. The end cover is fixedly mounted on the housing. An oil seal seat for the first oil seal is provided at the end of the end cover away from the first retaining ring. The first oil seal seals lubricating oil within the housing cavity. The first retaining ring has a first oil return hole extending radially outward from its inner ring. When the first retaining ring is installed, the first oil return hole is located at the bottom. During operation, the lubricating oil between the first retaining ring and the first oil seal flows back into the housing cavity through the first oil return hole and the first bearing under the influence of gravity.

[0006] In a specific embodiment of this utility model, the high-speed shaft oil leakage prevention structure further includes a second retaining ring and a second oil seal. An encoder is installed on the other end of the worm shaft, and the second bearing on this end is pressed against the bearing seat of the housing through the second retaining ring. The mounting shaft of the encoder is connected to the end of the other end of the worm shaft. An encoder is installed on the end of the mounting shaft that extends out of the housing. The second oil seal is provided between the mounting shaft and the hole on the housing. The second retaining ring has a second oil return hole extending radially outward from its inner ring. When the second retaining ring is installed, the second oil return hole is located at the bottom. During operation, the lubricating oil between the second retaining ring and the second oil seal flows back into the inner cavity of the housing through the second oil return hole and the second bearing under the action of gravity.

[0007] In another specific embodiment of this utility model, the first oil return hole and the second oil return hole are shaped like an arc, an ellipse, or a racetrack.

[0008] The present invention, due to the adoption of the above-mentioned structure, has the following beneficial effects: First, a motor and an encoder are respectively installed at both ends of the worm shaft (high-speed shaft) of the construction hoist gearbox. Retaining rings are added at both ends of the first and second bearings of the worm shaft. The retaining rings are provided with oil return holes, and when the retaining rings are installed, the oil return holes are located at the lower position. When the equipment is running, the lubricating oil accumulated between the retaining rings and the oil seal flows back to the inner cavity of the gearbox under the action of gravity through the oil return holes and the bearings, thereby preventing the lubricating oil between the retaining rings and the oil seal from overflowing from the oil seal due to full accumulation. Second, this structure not only realizes the lubrication function of the bearings, but also effectively prevents the lubricating oil from overflowing from the oil seal, avoiding its diffusion to other parts. Attached Figure Description

[0009] Figure 1 This is a structural schematic diagram of the gearbox for a construction hoist described in the prior art; Figure 2 This is a schematic diagram of the high-speed shaft oil leakage prevention structure for construction hoists described in this utility model; Figure 3 This is a schematic diagram of the first retaining ring of this utility model; Figure 4 This is a schematic diagram of the second retaining ring of this utility model.

[0010] In the diagram: 1. Housing; 2. Worm; 3. Worm Gear; 4. Worm Shaft; 5. Driven Shaft; 6. First Bearing; 7. Second Bearing; 8. First Retaining Ring, 801. First Oil Return Hole; 9. Second Retaining Ring, 901. Second Oil Return Hole; 10. End Cover, 1001. Oil Seal Seat; 11. First Oil Seal; 12. Second Oil Seal; 13. Encoder, 1301. Mounting Shaft. Detailed Implementation

[0011] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0012] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the positions shown in the corresponding figures, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0013] Please see Figure 2 This utility model relates to a high-speed shaft oil-proof structure for construction hoists, comprising a housing 1, a worm gear 2, and a worm wheel 3. The inner cavity of the housing 1 is filled with lubricating oil. The worm gear 2 meshes with the worm wheel 3, and the worm gear 2 is positioned above the worm wheel 3. The worm gear 2 is directly machined onto a worm shaft 4 or fixedly installed on the worm shaft 4. The worm wheel 3 is fixedly installed on a driven shaft 5. Both ends of the worm shaft 4 are rotatably mounted on the housing 1 via a first bearing 6 and a second bearing 7, respectively.

[0014] like Figure 2 and Figure 3 As shown, one end of the worm shaft 4 is connected to a motor, which drives the worm shaft 4 to rotate, thereby causing the worm wheel and worm to mesh and rotate. The worm shaft 4 is the high-speed shaft mentioned in the title. The high-speed shaft oil leakage prevention structure includes a first retaining ring 8 and a first oil seal 11. The first bearing 6 on one end of the worm shaft 4 is pressed against the end cover 10 of the housing 1 by the first retaining ring 8. The end cover 10 is fixedly installed on the housing 1. The inner hole of the end cover 10 has an oil seal seat 1001 for the installation of the first oil seal 11 at the end away from the first retaining ring 8. The first oil seal 11 seals the lubricating oil in the cavity of the housing 1. The first retaining ring 8 is provided with a first oil return hole 801 extending radially outward from its inner ring. When the first retaining ring 8 is installed, the first oil return hole 801 is located at the bottom. During operation, the lubricating oil between the first retaining ring 8 and the first oil seal 11 flows back into the inner cavity of the housing 1 through the first oil return hole 801 and the first bearing 6 under the action of gravity, preventing the lubricating oil between the first retaining ring 8 and the first oil seal 11 from overflowing from the first oil seal 11 due to full storage.

[0015] like Figure 2 and Figure 4As shown, the high-speed shaft oil leakage prevention structure also includes a second retaining ring 9 and a second oil seal 12. An encoder 13 is installed on the other end of the worm shaft 4. The second bearing 7 on this end is pressed against the bearing seat of the housing 1 by the second retaining ring 9. The mounting shaft 1301 of the encoder 13 is connected to the end of the other end of the worm shaft 4. The encoder 13 is installed on the end of the mounting shaft 1301 that extends out of the housing 1. The second oil seal 12 is provided between the mounting shaft 1301 and the hole on the housing 1. The second retaining ring 9 has a second oil return hole 901 extending radially outward from its inner ring. When the second retaining ring 9 is installed, the second oil return hole 901 is located at the bottom. During operation, the lubricating oil between the second retaining ring 9 and the second oil seal 12 flows back into the inner cavity of the housing 1 through the second oil return hole 901 and the second bearing 7 under the action of gravity, preventing the lubricating oil between the second retaining ring 9 and the second oil seal 12 from overflowing from the second oil seal 12 due to full storage.

[0016] like Figure 3 and Figure 4 As shown, the first oil return hole 801 and the second oil return hole 901 are in the shape of an arc, an ellipse, or a racetrack.

Claims

1. A high-speed shaft oil-proof structure for a construction hoist, comprising a housing (1), a worm (2), and a worm wheel (3), wherein the worm (2) meshes with the worm wheel (3) and is located above the worm wheel (3), the worm (2) is mounted on a worm shaft (4), and both ends of the worm shaft (4) are rotatably mounted on the housing (1) via a first bearing (6) and a second bearing (7), characterized in that: The high-speed shaft oil leakage prevention structure includes a first retaining ring (8) and a first oil seal (11). The first bearing (6) on one end of the worm shaft (4) is pressed against the end cover (10) of the housing (1) by the first retaining ring (8). The end cover (10) is fixedly installed on the housing (1). The inner hole of the end cover (10) is provided with an oil seal seat (1001) for the first oil seal (11) to be installed at the end away from the first retaining ring (8). 1) The lubricating oil is sealed in the cavity of the housing (1). The first retaining ring (8) is provided with a first oil return hole (801) extending radially outward from its inner ring. When the first retaining ring (8) is installed, the first oil return hole (801) is located at the bottom. During the operation, the lubricating oil between the first retaining ring (8) and the first oil seal (11) flows back into the cavity of the housing (1) through the first oil return hole (801) and the first bearing (6) under the action of gravity.

2. The high-speed shaft oil leakage prevention structure for construction hoists according to claim 1, characterized in that: The high-speed shaft oil leakage prevention structure also includes a second retaining ring (9) and a second oil seal (12). An encoder (13) is installed on the other end of the worm shaft (4). The second bearing (7) on this end is pressed against the bearing seat of the housing (1) by the second retaining ring (9). The mounting shaft (1301) of the encoder (13) is connected to the end of the other end of the worm shaft (4). The encoder (13) is installed on the end of the mounting shaft (1301) that extends out of the housing (1). The second oil seal (12) is provided between the second oil seal (1301) and the hole on the housing (1). The second oil return hole (901) is provided on the second retaining ring (9) extending radially outward from its inner ring. When the second retaining ring (9) is installed, the second oil return hole (901) is located at the bottom. During operation, the lubricating oil between the second retaining ring (9) and the second oil seal (12) flows back into the inner cavity of the housing (1) through the second oil return hole (901) and the second bearing (7) under the action of gravity.

3. The high-speed shaft oil leakage prevention structure for construction hoists according to claim 1, characterized in that: The first oil return hole (801) and the second oil return hole (901) are in the shape of one of the following: arc, ellipse or racetrack.

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