Motor housing suitable for low-temperature environment
By using a split design for the end caps and base, limit baffles, shaft covers, and cast iron bases and bearings, the problems of deformation and waterproofing of the motor housing in low-temperature environments are solved, thus improving service life and reliability.
Patent Information
- Application Number
- CN202423225216.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing motor housings deform and are damaged in low-temperature environments due to the difference in thermal expansion coefficients between the base and bearing materials, affecting their service life and resulting in poor waterproofing.
The end cap and base adopt a split design, combined with a limit baffle and shaft cover. The base and bearings are made of cast iron, and water-blocking and water-resistant parts are set. With the addition of a water-draining slope, the connection strength and waterproof performance are improved.
The connection strength between the base and the end cover has been improved, reducing the risk of base breakage, enhancing the service life and reliability of the motor housing in low-temperature environments, and improving waterproof performance.
Smart Images
Figure CN223829133U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of motor housings, and in particular to a motor housing suitable for low-temperature environments. Background Technology
[0002] The motor housing is an important component of the electric motor, usually made of aluminum alloy. Its main function is to protect the various internal components of the motor from corrosion and damage from the external environment. The motor housing includes the casing, end covers and tail covers respectively located on both sides of the casing. The end covers have a base for mounting the stator core. The motor shaft is coaxially mounted inside the base, and a bearing is installed between the motor shaft and the base.
[0003] In existing technologies, the motor base and end cover are mostly integrally formed using a die-casting aluminum process. The bearings located between the motor shaft and the motor base are mostly made of steel or iron. Since the coefficient of thermal expansion of aluminum is about twice that of steel or iron, this means that under the same temperature change, the volume change of aluminum will be more obvious and it is more prone to deformation. When the motor housing is used in a low-temperature environment, the motor base will shrink due to temperature changes, which will seize the bearing, causing damage to the motor base and bearing and affecting the service life of the motor housing. Utility Model Content
[0004] In order to improve the service life of motor housing in low-temperature environments, this application provides a motor housing suitable for low-temperature environments.
[0005] This application provides a motor housing suitable for low-temperature environments, employing the following technical solution:
[0006] A motor housing suitable for low-temperature environments includes a housing, end caps and tail caps respectively disposed on both sides of the housing, a base on the end cap, a bearing between the base and the motor shaft, the end cap and the base being separately designed, a through hole for the base to pass through the end cap, a limiting baffle that fits against the outer wall of the base on the end cap, the limiting baffle extending away from the housing, and a shaft cover for restricting communication between the through hole and the outside, the inner wall of the shaft cover fitting against the outer wall of the limiting baffle.
[0007] By adopting the above technical solution and setting the limiting baffle, the contact area between the base and the end cover is effectively increased, thereby improving the connection strength between the base and the end cover to a certain extent. The separate design of the base and the end cover not only ensures the integrity and strength of the base, but also reduces the possibility of base breakage during the rotation of the motor shaft, and extends the service life of the motor housing. It also improves the production efficiency of the end cover and the base to a certain extent. The setting of the shaft cover restricts the connection between the connecting hole and the outside, making it difficult for external impurities or liquids to enter the housing.
[0008] Preferably, the end cap near the housing is concave in the direction away from the housing to form a water-blocking part, and the end of the housing facing the end cap is concave in the direction of the end cap to form a water-blocking part.
[0009] By adopting the above technical solution, when the motor housing is used in a low-temperature environment, it is easy to generate water droplets on the surface of the motor housing when it comes into contact with the hot air from the outside. With the cooperation of the water-blocking part and the water-resistant part, the water from the outside can be blocked by the water-blocking part or the water-resistant part when the motor housing is placed vertically or horizontally on the base, so that it is not easy to enter the housing. This effectively improves the service life of the motor housing and enhances the reliability of the motor housing when used in a low-temperature environment.
[0010] Preferably, the water-blocking part and the water-retaining part are offset along the length direction of the machine base, and the water-blocking part is located on the side of the water-retaining part closer to the limiting baffle.
[0011] By adopting the above technical solution, the staggered arrangement can provide a certain amount of clearance for the movement of the water-blocking part toward the end cover during the forming of the water-blocking part, thereby reducing the damage to the motor housing during the assembly process.
[0012] Preferably, the side wall of the end cap is provided with a hydrophobic slope, and the extension line of the hydrophobic slope toward the shell is located at the end of the water-blocking part away from the shell.
[0013] By adopting the above technical solution and setting the hydrophobic slope, the liquid falling on the motor housing is guided, so that the liquid is not easy to accumulate on the end cover surface and the water-blocking part, which can improve the waterproof performance of the motor housing to a certain extent.
[0014] Preferably, the housing, end cover, shaft cover and tail cover are made of aluminum alloy, and the bearing and base are made of cast iron.
[0015] By adopting the above technical solution, since the bearing and the frame are both made of cast iron, when the motor housing is used in a low-temperature environment, the shrinkage of the frame due to temperature changes is consistent with that of the bearing. The shrinkage of the frame due to temperature changes is less likely to affect the bearing, thereby improving the service life of the motor housing in a low-temperature environment to a certain extent. In addition, the cost of cast iron is lower than that of aluminum alloy, so making the frame with cast iron also reduces the cost of the motor housing to a certain extent.
[0016] In summary, this application includes at least one of the following beneficial technical effects:
[0017] 1. By setting the limit baffle, the contact area between the base and the end cover is effectively increased, thereby improving the connection strength between the base and the end cover to a certain extent. The separate design of the base and the end cover not only ensures the integrity and strength of the base, but also reduces the possibility of base breakage during the rotation of the motor shaft, and improves the service life of the motor housing, but also improves the production efficiency of the end cover and the base to a certain extent.
[0018] 2. Since the bearing and the frame are both made of cast iron, when the motor housing is used in a low-temperature environment, the shrinkage of the frame due to temperature changes is consistent with that of the bearing. The shrinkage of the frame due to temperature changes is less likely to affect the bearing, thus improving the service life of the motor housing in low-temperature environments to a certain extent.
[0019] 3. When the motor housing is used in a low-temperature environment, it is easy for water droplets to form on the surface of the motor housing due to contact with the hot air from the outside. With the cooperation of the water-blocking part and the water-resistant part, the water from the outside can be blocked by the water-blocking part or the water-resistant part when the motor housing is placed vertically or horizontally on the base, so that it is not easy to enter the housing. This effectively improves the service life of the motor housing and enhances the reliability of the motor housing when used in low-temperature environments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.
[0021] Figure 2 This is a cross-sectional view of the overall structure in the embodiments of this application.
[0022] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Water-blocking part; 2. End cover; 21. Base; 211. Connecting through hole; 22. Limiting baffle; 23. Shaft cover; 24. Water-blocking part; 25. Drainage slope; 3. Tail cover; 4. Motor shaft; 41. Bearing. Detailed Implementation
[0023] The following is in conjunction with the appendix Figures 1-2 The present invention will be described in further detail below.
[0024] This application discloses a motor housing suitable for low-temperature environments, referring to... Figure 1 and Figure 2The device includes a housing 1, end caps 2 and tail caps 3 respectively disposed on both sides of the housing 1. The end caps 2 are provided with a base 21. The end caps 2 and the base 21 are designed separately. The end caps 2 have a coaxial through hole 211 for the base 21 to pass through. The end caps 2 have an integrally formed limiting baffle 22 that fits against the outer wall of the base 21. The limiting baffle 22 extends away from the housing 1. The base 21 and the end caps 2 are fixed by press fitting. The setting of the limiting baffle 22 effectively increases the contact area between the base 21 and the end caps 2, thereby improving the connection strength between the base 21 and the end caps 2 to a certain extent. The separate design of the base 21 and the end caps 2 not only ensures the integrity and strength of the base 21, but also reduces the possibility of the base 21 breaking during the rotation of the motor shaft 4, improves the service life of the motor housing, and also improves the production efficiency of the end caps 2 and the base 21 to a certain extent.
[0025] Reference Figure 1 and Figure 2 The end cap 2 is also provided with a shaft cap 23 for restricting the connection through hole 211 from communicating with the outside. The inner wall of the shaft cap 23 fits against the outer wall of the limiting baffle 22. The shaft cap 23 and the end cap 2 are also fixed by press fitting. By setting the shaft cap 23, the connection through hole 211 is restricted from communicating with the outside, so that impurities or liquids from the outside are not easy to enter the housing 1.
[0026] Reference Figure 1 and Figure 2 A bearing 41 is provided between the base 21 and the motor shaft 4. The housing 1, end cover 2, shaft cover 23 and tail cover 3 are made of aluminum alloy, while the bearing 41 and the base 21 are made of cast iron. Since the bearing 41 and the base 21 are both made of cast iron, when the motor housing is used in a low-temperature environment, the shrinkage of the base 21 due to temperature changes is consistent with that of the bearing 41. The shrinkage of the base 21 due to temperature changes is less likely to affect the bearing 41, thereby improving the service life of the motor housing in low-temperature environments to a certain extent. In addition, the cost of cast iron is lower than that of aluminum alloy. Therefore, the base 21 is made of cast iron, which also reduces the cost of the motor housing to a certain extent.
[0027] Reference Figure 1 and Figure 2When the motor housing is used in a low-temperature environment, it is easy to come into contact with the hot air from the outside, causing water droplets to form on the surface of the motor housing. Therefore, the waterproof performance of the motor housing is also very important. The end cap 2 near the housing 1 is concave in the direction away from the housing 1 to form a water-blocking part 24, and the end of the housing 1 facing the end cap 2 is concave in the direction of the end cap 2 to form a water-blocking part 11. In the prior art, when making the waterproof structure of the motor housing, most of them will leave a groove on the end cap 2 for the housing 1 to fit in, and then set a sealing ring in the groove. However, in actual application, it has been found that when the motor housing is placed and used in the vertical direction on the base 21, it can indeed achieve a good waterproof effect. However, when the motor housing is placed and used in the horizontal direction on the base 21, water can first enter the groove along the side wall of the housing 1, and then move along the structure of the inner wall of the groove to enter the housing 1, resulting in poor waterproof effect.
[0028] With the water-blocking part 24 in place, when the motor housing is placed vertically on the base 21 and used, the spilled water can slide along the side wall of the end cover 2 to contact the water-blocking part 24, and then slide along the water-blocking part 24 to separate from the motor housing, so that the water is not easy to contact the housing 1. With the water-blocking part 11 in place, when the motor housing is placed horizontally on the base 21 and used, the spilled water is affected by the water-blocking part 11 and is not easy to move towards the inside of the housing 1, which achieves a better waterproof effect and improves the waterproof performance of the motor housing.
[0029] Reference Figure 1 and Figure 2 The water-blocking part 11 and the water-retaining part 24 are offset along the length of the base 21. The water-blocking part 11 is located on the side of the water-retaining part 24 that is close to the limiting baffle 22. The offset arrangement can provide a certain clearance space for the water-blocking part 11 to move toward the end cover 2 when the water-retaining part 24 is formed, reduce the damage to the motor housing during the assembly process, and also facilitate the setting of a sealing ring on the water-blocking part 11 to improve the sealing effect between the housing 1 and the end cover 2.
[0030] Reference Figure 1 and Figure 2 The end cap 2 has a hydrophobic inclined surface 25 on its side wall. The extension line of the hydrophobic inclined surface 25 towards the housing 1 is located at the end of the water-blocking part 24 away from the housing 1. The hydrophobic inclined surface 25 provides guidance for liquid falling on the motor housing, making it less likely for liquid to accumulate on the surface of the end cap 2 and the water-blocking part 24, which can improve the waterproof performance of the motor housing to a certain extent.
[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A motor housing suitable for low-temperature environments, comprising a housing (1), end caps (2) and a tail cap (3) respectively disposed on both sides of the housing (1), wherein a base (21) is provided on the end caps (2), and a bearing (41) is provided between the base (21) and the motor shaft (4), characterized in that, The end cap (2) and the base (21) are designed separately. The end cap (2) has a through hole (211) for the base (21) to pass through. The end cap (2) has a limiting baffle (22) that fits against the outer wall of the base (21). The limiting baffle (22) extends away from the housing (1). The end cap (2) also has a shaft cover (23) for restricting the connection through hole (211) from communicating with the outside. The inner wall of the shaft cover (23) fits against the outer wall of the limiting baffle (22).
2. The motor housing suitable for low-temperature environments according to claim 1, characterized in that, The end cap (2) near the end of the housing (1) is concave in the direction away from the housing (1) to form a water-blocking part (24), and the end of the housing (1) facing the end cap (2) is concave in the direction of the end cap (2) to form a water-blocking part (11).
3. The motor housing suitable for low-temperature environments according to claim 2, characterized in that, The water-blocking part (11) and the water-retaining part (24) are offset along the length direction of the base (21), and the water-blocking part (11) is located on the side of the water-retaining part (24) near the limiting baffle (22).
4. The motor housing suitable for low-temperature environments according to claim 2, characterized in that, The end cap (2) has a hydrophobic inclined surface (25) on its side wall. The extension line of the hydrophobic inclined surface (25) towards the housing (1) is located at the end of the water-blocking part (24) away from the housing (1).
5. The motor housing suitable for low-temperature environments according to claim 1, characterized in that, The housing (1), end cover (2), shaft cover (23) and tail cover (3) are made of aluminum alloy, and the bearing (41) and base (21) are made of cast iron.