A sealing structure for an electric machine and an electric machine

Abstract

The utility model relates to motor structure technical field, specifically disclose a kind of sealing structure and motor for motor, motor includes rotating shaft, bearing, end cover and press sleeve, bearing and press sleeve are sequentially sleeved in rotating shaft outside along the axial direction, end cover is sleeved in bearing and press sleeve outside. Sealing structure for motor includes sealing plate and water ring. Sealing plate is sleeved in press sleeve outside, sealing plate is located the axial side of end cover away from bearing, and it is tightly formed circumferential sealing with end cover and relatively fixed, sealing plate is provided with sewage passage;Water ring is sleeved in rotating shaft outside, water ring is located the axial side of press sleeve away from bearing, and it is tightly formed circumferential sealing with the rotating shaft and relatively fixed, first labyrinth structure is formed between water ring and sealing plate, sewage passage is connected with the indoor environment and outdoor environment of first labyrinth structure, impurity in first labyrinth structure always has the tendency of flowing into sewage passage. Such extension bearing, press sleeve, the service life of rotating shaft, so that motor can stably operate.

Description

Technical Field

[0001] This utility model relates to the field of motor structure technology, and in particular to a sealing structure for motors and a motor. Background Technology

[0002] Loaders and other construction machinery are frequently used or exposed to environments containing large amounts of mud, dust, or other pollutants, and motors inevitably operate under these conditions. When mud and other particles enter the motor bearings, they accelerate bearing wear, reduce their service life, and may even lead to motor failure. Mud increases internal friction in the bearings, generating additional heat and further exacerbating wear. In some cases, mud may cause the bearings to seize, preventing the motor from operating normally.

[0003] Therefore, there is an urgent need for a sealing structure for motors and a motor in general to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing structure and motor for motors, so as to solve the problem that dirt can easily come into contact with and contaminate bearings and / or shafts, leading to a decrease in motor operating capacity.

[0005] A sealing structure for an electric motor is provided. The motor includes a rotating shaft, a bearing, an end cover, and a pressure sleeve. The bearing and the pressure sleeve are sequentially sleeved around the rotating shaft along the axial direction. The end cover is sleeved around the bearing and the pressure sleeve. The sealing structure for the electric motor includes:

[0006] A sealing plate is fitted over the pressure sleeve. The sealing plate is located on the axial side of the end cover opposite to the bearing. It is tightly fitted to the end cover to form a circumferential seal and is relatively fixed. The sealing plate has a drain channel.

[0007] A water-throwing ring is sleeved on the outside of the aforementioned rotating shaft. The water-throwing ring is located on the axial side of the aforementioned pressure sleeve opposite to the aforementioned bearing. It is tightly fitted to the aforementioned rotating shaft to form a circumferential seal and is relatively fixed. A first labyrinth structure is formed between the aforementioned water-throwing ring and the aforementioned sealing plate. The aforementioned sewage discharge channel connects the indoor environment of the aforementioned first labyrinth structure with the outdoor environment. Impurities in the aforementioned first labyrinth structure always tend to flow into the aforementioned sewage discharge channel.

[0008] As a preferred embodiment of the sealing structure for the motor, the first labyrinth structure includes multiple annular chambers, which are connected end to end around the axis of the rotating shaft, and the multiple annular chambers are nested in sequence and connected to each other. The sewage discharge channel is connected to the lowest one of the multiple annular chambers.

[0009] As a preferred embodiment of the sealing structure for the motor, it further includes a shaft oil seal, which is located on the side of the first labyrinth structure near the rotating shaft.

[0010] As a preferred embodiment of the sealing structure for the aforementioned motor, a second labyrinth structure is provided between the sealing plate and the pressure sleeve.

[0011] As a preferred embodiment of the sealing structure for the motor, it further includes a skeleton oil seal, which is sandwiched between the sealing plate and the end cover along the axial direction of the shaft and between the pressure sleeve and the sealing plate along the radial direction of the shaft.

[0012] As a preferred embodiment of the aforementioned sealing structure for motors, the sealing plate is provided with an oil injection channel, the oil inlet of which is formed on the peripheral sidewall of the sealing plate, and the oil outlet of which faces the contact point between the skeleton oil seal and the pressure sleeve.

[0013] As a preferred embodiment of the sealing structure for the aforementioned motor, a third labyrinth structure is provided between the end cover and the pressure sleeve.

[0014] As a preferred embodiment of the aforementioned sealing structure for motors, the end cover and the sealing plate are fitted together via a transition fit and connected by threaded fasteners.

[0015] As a preferred embodiment of the sealing structure for the aforementioned motor, the aforementioned water-throwing ring is interference-fitted with the aforementioned rotating shaft.

[0016] An electric motor is also provided, including the aforementioned sealing structure for the motor.

[0017] Beneficial effects:

[0018] This utility model provides a sealing structure for an electric motor. The motor includes a shaft, bearings, an end cover, and a pressure sleeve. The bearings and pressure sleeve are sequentially fitted around the shaft along the axial direction, and the end cover is fitted around the bearings and pressure sleeve. The sealing structure includes a sealing plate and a water-slinging ring. The sealing plate is fitted around the pressure sleeve and is located on the axial side of the end cover opposite to the bearing, forming a circumferential seal and being relatively fixed. The sealing plate has a drainage channel. The water-slinging ring is fitted around the shaft and is located on the axial side of the pressure sleeve opposite to the bearing, forming a circumferential seal and being relatively fixed. A first labyrinth structure is formed between the water-slinging ring and the sealing plate. The drainage channel connects the indoor and outdoor environments of the first labyrinth structure, and impurities within the first labyrinth structure always tend to flow into the drainage channel.

[0019] For example, a sealing plate is fitted over the pressure sleeve, with its axial end face tightly against the end face of the end cover opposite the bearing to form a circumferential seal, preventing impurities such as mud and sand from entering the shaft through the gap between the sealing plate and the end cover. A water-slinging ring is fitted over the shaft, located on the axial side of the pressure sleeve, with its inner wall tightly against the outer wall of the shaft to form a circumferential seal, preventing impurities such as dirt from entering the bearing side. Thus, the sealing plate and water-slinging ring, surrounding the pressure sleeve, protect it. Since the sealing plate does not rotate with the shaft when the motor starts, but the water-slinging ring does, there is relative movement between them. Therefore, a first labyrinth structure is provided between the sealing plate and the water-slinging ring to prevent mud and sand from entering the shaft side through the gap between them. The sealing plate has a drainage channel to discharge dirt and impurities from the first labyrinth structure. This extends the service life of the bearing, pressure sleeve, and shaft, enabling the motor to operate stably. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the sealing structure for the motor in an embodiment of this utility model.

[0021] In the picture:

[0022] 1. Shaft; 2. Bearing; 3. End cap; 4. Pressure sleeve;

[0023] 5. Sealing plate; 51. Sewage discharge channel; 52. Oil injection channel;

[0024] 6. Water-slinging ring; 61. Threaded hole for puller;

[0025] 7. Shaft oil seal; 8. Skeleton oil seal;

[0026] 100. First labyrinth structure; 110. First chamber; 120. Second chamber;

[0027] 200. The second maze structure;

[0028] 300. The third maze structure. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] like Figure 1As shown, this utility model provides a sealing structure for a motor. The motor includes a rotating shaft 1, a bearing 2, an end cover 3, and a pressure sleeve 4. The bearing 2 and the pressure sleeve 4 are sequentially sleeved on the rotating shaft 1 along the axial direction. The end cover 3 is sleeved on the bearing 2 and the pressure sleeve 4. The sealing structure for the motor includes a sealing plate 5 and a water-throwing ring 6. The sealing plate 5 is sleeved on the pressure sleeve 4 and is located on the side of the end cover 3 opposite to the axial direction of the bearing 2. It is tightly fitted with the end cover 3 to form a circumferential seal and is relatively fixed. The sealing plate 5 has a sewage discharge channel 51. The water-throwing ring 6 is sleeved on the rotating shaft 1 and is located on the side of the pressure sleeve 4 opposite to the axial direction of the bearing 2. It is tightly fitted with the rotating shaft 1 to form a circumferential seal and is relatively fixed. The water-throwing ring 6 and the sealing plate 5 form a first labyrinth structure 100. The sewage discharge channel 51 connects the indoor environment of the first labyrinth structure 100 with the outdoor environment. Impurities in the first labyrinth structure 100 always tend to flow into the sewage discharge channel 51.

[0034] For example, the rotating shaft 1 is a stepped shaft, including a large-diameter section, a small-diameter section, and a shoulder formed between them. The inner ring of the bearing 2 and the pressure sleeve 4 are fitted onto the small-diameter section and both form an interference fit, with the inner ring sandwiched between the pressure sleeve 4 and the shoulder. The end cover 3 has a coaxially arranged large-diameter hole, a small-diameter hole, and a shoulder formed between them. The large-diameter hole and the small-diameter hole are arranged sequentially along the axial direction and are interconnected. The outer ring of the bearing 2 is inserted into the large-diameter hole and has an interference fit with the end cover 3. The axial side of the outer ring abuts against the shoulder along the axial direction of the rotating shaft 1, and the pressure sleeve 4 is inserted into the small-diameter hole. When the motor starts, the rotating shaft 1 rotates around its own axis, and the pressure sleeve 4 rotates with the rotating shaft 1. The rotating shaft 1 rotates relative to the end cover 3 through the bearing 2.

[0035] It is understandable that the motor is divided by the end cover 3, the side where the bearing 2 is located is the inside of the motor, the pressure sleeve 4 is partially located outside the motor, and the shaft 1 is partially extended outside the motor.

[0036] For example, the sealing plate 5 is sleeved outside the pressure sleeve 4. The axial end face of the sealing plate 5 and the end face of the end cover 3 opposite to the bearing 2 are tightly fitted to form a circumferential seal to prevent impurities such as mud and sand from entering the shaft 1 from between the sealing plate 5 and the end cover 3. The water-throwing ring 6 is sleeved on the shaft 1. The water-throwing ring 6 is located on the axial side of the pressure sleeve 4. The inner wall of the water-throwing ring 6 and the outer wall of the shaft 1 are tightly fitted to form a circumferential seal to prevent impurities such as mud from entering the bearing 2 side from there. As such, the sealing plate 5 and the water-throwing ring 6 are wrapped around the pressure sleeve 4 to protect the pressure sleeve 4. Since the sealing plate 5 does not rotate with the shaft 1 when the motor starts, but the water-throwing ring 6 rotates with the shaft 1, there is relative movement between the sealing plate 5 and the water-throwing ring 6. Therefore, a first labyrinth structure 100 is provided between the sealing plate 5 and the water-throwing ring 6 to prevent mud and sand from entering the side of the shaft 1 from the gap between the sealing plate 5 and the water-throwing ring 6. The sealing plate 5 has a drainage channel 51 for discharging dirt and impurities from the first labyrinth structure 100. This extends the service life of the bearing 2, the pressure sleeve 4, and the rotating shaft 1, enabling the motor to operate stably.

[0037] For example, the sealing plate 5 is an aluminum alloy component.

[0038] For example, the water-slinging ring 6 is made of 45 steel.

[0039] Optionally, the first maze structure 100 includes multiple annular chambers, which are connected end to end around the axis of the rotating shaft 1, and the multiple annular chambers are nested in sequence and connected to each other. The sewage discharge channel 51 is connected to the lowest one of the multiple annular chambers.

[0040] For example, the axis of the rotating shaft 1 is parallel to the horizontal direction. A first protrusion, annular in shape, is provided on the end face of the sealing plate 5 facing the water-slinging ring 6, connecting end-to-end around the axis of the rotating shaft 1. A second protrusion, also annular in shape, is provided on the end face of the water-slinging ring 6 facing the sealing plate 5, connecting end-to-end around the axis of the rotating shaft 1. The alternating arrangement of the first and second protrusions forms a first labyrinth structure 100. Along the radial direction of the rotating shaft 1, annular chambers can be formed between adjacent first protrusions, between adjacent first and second protrusions, and between adjacent second protrusions. Since there are gaps between the top of the first protrusion and the water-slinging ring 6, and between the top of the second protrusion and the sealing plate 5, multiple annular chambers are interconnected. Figure 1 As shown, the annular chamber includes a first chamber 110 and a second chamber 120. The first chamber 110 is formed on the outer periphery of the second chamber 120. The sewage discharge channel 51 is opened at the bottom of the sealing plate 5. One end of the sewage discharge channel 51 is connected to the lowest point of the first chamber 110. In this way, the mud and sand entering the first labyrinth structure 100 always move towards the bottom of the first chamber 110 under the action of gravity and are then discharged through the sewage discharge channel 51.

[0041] In other embodiments, the axis of the rotating shaft 1 is parallel to the vertical direction, the sealing plate 5 is located below the water-throwing ring 6, and the end face of the sealing plate 5 facing the water-throwing ring 6 is inclined relative to the horizontal plane, so that the mud and sand impurities in the first labyrinth structure 100 always move to the low-lying area under the action of their own weight, and are then discharged through the sewage channel 51.

[0042] Optionally, the sealing structure for the motor also includes a shaft oil seal 7, which is located on the side of the first labyrinth structure 100 near the rotating shaft 1.

[0043] For example, the shaft oil seal 7 includes a stationary ring and a rotating ring. The stationary ring is fixedly installed on the sealing plate 5, and the rotating ring is fixedly installed on the water-slinging ring 6. The end faces of the stationary ring and the rotating ring are tightly fitted to form a seal. The shaft oil seal 7 is installed within the first labyrinth structure 100 to prevent contaminants such as dust, dirt, and moisture from further penetrating to one side of the rotating shaft 1.

[0044] Optionally, a second labyrinth structure 200 is provided between the sealing plate 5 and the pressure sleeve 4.

[0045] For example, the inner peripheral wall of the sealing plate 5 is provided with a second labyrinth groove, which together with the outer peripheral wall of the pressure sleeve 4 forms a second labyrinth structure 200 to prevent dust, dirt, moisture and other contaminants from further entering the bearing 2.

[0046] Optionally, the sealing structure for the motor also includes a skeleton oil seal 8, which is sandwiched between the sealing plate 5 and the end cover 3 along the axial direction of the shaft 1, and between the pressure sleeve 4 and the sealing plate 5 along the radial direction of the shaft 1.

[0047] For example, the sealing plate 5 has stepped holes, including a large-diameter hole, a small-diameter hole, and a shoulder formed between them. Part of the pressure sleeve 4 is inserted into the large-diameter hole and the small-diameter hole. The second labyrinth structure 200 is formed between the inner side wall of the small-diameter hole and the outer side wall of the pressure sleeve 4. The skeleton oil seal 8 is sleeved on the outside of the pressure sleeve 4 and inserted into the large-diameter hole. One axial side wall of the skeleton oil seal 8 abuts against the shoulder, and the other side wall abuts against the end cover 3. The skeleton oil seal 8 is used to isolate the bearing 2 from the external environment, which can prevent lubricating oil leakage and block the entry of external contaminants such as dust, dirt, and moisture.

[0048] For example, the lip of the skeleton oil seal 8 is made of wear-resistant polytetrafluoroethylene.

[0049] Optionally, the sealing plate 5 is provided with an oil injection channel 52. The oil inlet of the oil injection channel 52 is formed on the peripheral sidewall of the sealing plate 5, and the oil outlet of the oil injection channel 52 faces the contact point between the skeleton oil seal 8 and the pressure sleeve 4.

[0050] For example, the skeleton oil seal 8 includes a mounting part and a lip. The mounting part abuts against the sealing plate 5 in the axial direction, and the lip is spaced apart from the sealing plate 5 in the axial direction to form a gap. The oil in the oil injection channel 52 can enter the contact surface between the skeleton oil seal 8 and the pressure sleeve 4 through the gap for lubrication.

[0051] Furthermore, the axis of the rotating shaft 1 is parallel to the horizontal direction, the oil inlet of the oil inlet channel faces upward, and a switch is provided at the outlet to prevent oil backflow and overflow.

[0052] For example, the oil injection channel 52 is opened at 90°.

[0053] Optionally, a third labyrinth structure 300 is provided between the end cap 3 and the pressure sleeve 4.

[0054] For example, the inner peripheral wall of the small-diameter hole of the end cover 3 is provided with a third labyrinth groove, which together with the outer side wall of the pressure sleeve 4 forms a third labyrinth structure 300 to prevent dust, dirt, moisture and other contaminants from further entering the bearing 2.

[0055] Optionally, the end cap 3 and the sealing plate 5 are fitted with a stop and connected by threaded fasteners.

[0056] For example, the end cover 3 has a recessed stop on the axial side facing away from the bearing 2, and the sealing plate 5 has a convex stop on the side facing the end cover 3. The convex stop is inserted into the recessed stop, and the end cover 3 and the sealing plate 5 are fixed by threaded fasteners, so that the connection and sealing reliability of the two are higher.

[0057] Optionally, the water-slinging ring 6 and the rotating shaft 1 are interference-fitted. This configuration simplifies the assembly of the water-slinging ring 6 and the rotating shaft 1, making installation easier.

[0058] Furthermore, the water-slinging ring 6 has a puller threaded hole 61 on the axial side opposite to the end cover 3, which facilitates the disassembly of the water-slinging ring 6.

[0059] An electric motor is also provided, including the motor sealing structure described above.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sealing structure for an electric motor, the motor comprising a rotating shaft (1), a bearing (2), an end cover (3), and a pressure sleeve (4), wherein the bearing (2) and the pressure sleeve (4) are sequentially sleeved around the rotating shaft (1) along the axial direction, and the end cover (3) is sleeved around the bearing (2) and the pressure sleeve (4), characterized in that, The sealing structure for the motor includes: A sealing plate (5) is fitted over the pressure sleeve (4). The sealing plate (5) is located on the axial side of the end cover (3) opposite to the bearing (2). It is tightly fitted with the end cover (3) to form a circumferential seal and is relatively fixed. The sealing plate (5) has a sewage discharge channel (51). A water-slinging ring (6) is sleeved on the outside of the rotating shaft (1). The water-slinging ring (6) is located on the axial side of the pressure sleeve (4) opposite to the bearing (2). It is tightly attached to the rotating shaft (1) to form a circumferential seal and is relatively fixed. A first labyrinth structure (100) is formed between the water-slinging ring (6) and the sealing plate (5). The sewage discharge channel (51) connects the indoor environment of the first labyrinth structure (100) with the outdoor environment. Impurities in the first labyrinth structure (100) always tend to flow into the sewage discharge channel (51).

2. The sealing structure for an electric motor according to claim 1, characterized in that, The first maze structure (100) includes multiple annular chambers, which are connected end to end around the axis of the rotating shaft (1), and the multiple annular chambers are nested in sequence and connected to each other. The sewage channel (51) is connected to the lowest one of the multiple annular chambers.

3. The sealing structure for an electric motor according to claim 1, characterized in that, It also includes a shaft oil seal (7), which is located on the side of the first labyrinth structure (100) near the rotating shaft (1).

4. The sealing structure for an electric motor according to claim 1, characterized in that, A second labyrinth structure (200) is provided between the sealing plate (5) and the pressure sleeve (4).

5. The sealing structure for an electric motor according to claim 1, characterized in that, It also includes a skeleton oil seal (8), which is sandwiched between the sealing plate (5) and the end cap (3) along the axial direction of the rotating shaft (1) and between the pressure sleeve (4) and the sealing plate (5) along the radial direction of the rotating shaft (1).

6. The sealing structure for an electric motor according to claim 5, characterized in that, The sealing plate (5) has an oil injection channel (52), the oil inlet of the oil injection channel (52) is formed on the peripheral sidewall of the sealing plate (5), and the oil outlet of the oil injection channel (52) faces the contact point between the skeleton oil seal (8) and the pressure sleeve (4).

7. The sealing structure for an electric motor according to claim 1, characterized in that, A third labyrinth structure (300) is provided between the end cap (3) and the pressure sleeve (4).

8. The sealing structure for an electric motor according to claim 1, characterized in that, The end cap (3) and the sealing plate (5) are fitted together by a transition joint and connected by threaded fasteners.

9. The sealing structure for an electric motor according to claim 1, characterized in that, The water-throwing ring (6) is interference-fitted with the rotating shaft (1).

10. An electric motor, characterized in that, Includes the sealing structure for motors as described in any one of claims 1-9.

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