Oil seal and motor
By designing a stepped structure at the bottom of the oil seal and cooperating with the protruding parts inside the housing, the problem of axial displacement of the oil seal was solved, achieving sealing stability and a compact design for the motor, reducing equipment wear and maintenance costs.
Patent Information
- Application Number
- CN202423106485.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing oil seals are prone to axial displacement after long-term operation, leading to seal failure. At the same time, the additional limiting structure increases the length and cost of the motor.
A stepped structure is designed at the bottom of the oil seal, which, together with the protruding part inside the housing, provides axial restraint. Radial clamping force is provided through the spring groove and spring to ensure that the oil seal is in close contact with the motor shaft and prevent axial displacement.
It effectively prevents the oil seal from shifting axially during long-term operation, maintains sealing performance, reduces equipment wear and maintenance costs, and avoids increasing motor length.
Smart Images
Figure CN223635324U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor processing technical field, and especially relates to oil seal and motor. BACKGROUND
[0002] Oil seal is the key sealing element in servo motor equipment, cooperates motor shaft installation, is used for isolating external environment and internal motor structure. The sealing lip of oil seal is in close contact with motor shaft, forms the closed space, prevents internal lubricating oil or liquid leakage, maintains the stability of equipment internal working environment, also effectively blocks external dust, moisture and other impurities or corrosive substances, avoids equipment damage. Meanwhile, the contact surface of oil seal and motor shaft can form a layer of fluid dynamic pressure oil film, and the oil film is not only the medium of sealing, but also plays a part of lubrication, can effectively reduce the friction loss of equipment, improves the operation efficiency of equipment.
[0003] At present, most of the oil seals rely on the spring clamping lip and the motor shaft to apply pressure in the radial direction, improve the pressing force of the sealing lip on the motor shaft, so as to play a fixing role, but the equipment will produce axial displacement of the oil seal after a long time of operation. If the oil seal is axially fixed by using a pressing plate structure, or a protruding limiting structure is added on the shell and cover, it will lead to the increase of the length of the motor, and thus increase the cost. UTILITY MODEL CONTENT
[0004] The utility model aims at overcoming the problems of oil seal limiting failure caused by long-term use in the prior art and the increase of motor length caused by additional limiting structure, and provides oil seal and motor.
[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: an oil seal is provided, which comprises a bottom, a lip, a cooperating part and a step, the lip is axially fixed at the first end of the inner side of the bottom, the cooperating part is axially fixed at the first end of the outer side of the bottom, and the step is axially arranged at the second end of the outer side of the bottom.
[0006] In an embodiment, the side of the lip away from the cooperating part is radially protruded to form a sealing lip, and the sealing lip is directly in contact with the motor shaft.
[0007] In an embodiment, a spring groove is formed on the wall of the side of the lip close to the cooperating part, and a spring is installed in the spring groove.
[0008] In an embodiment, the oil seal further comprises a reinforcing framework, and the reinforcing framework is embedded in the inside of the bottom and the cooperating part.
[0009] In an embodiment, the side of the lip away from the cooperating part is radially protruded to form an outer lip and an inner lip, the inner lip is located at one end close to the bottom, and the outer lip is located at one end away from the bottom.
[0010] In an embodiment, a spring groove is formed on the wall of the lip part near the fitting part, the spring groove is connected with the outer lip, and a spring is installed in the spring groove.
[0011] In an embodiment, the oil seal includes a shell, a motor shaft, an oil seal and an internal assembly, the motor shaft is coaxially installed with the shell, one end of the motor shaft penetrates into the shell, and the oil seal and the internal assembly are coaxially sleeved on the motor shaft in sequence and are wrapped by the shell.
[0012] In an embodiment, a protruding part is arranged on the inner wall of the shell, and the step is in axial contact with the protruding part.
[0013] In an embodiment, the internal assembly includes a bearing, a stator and a rotor, the bearing and the rotor are coaxially sleeved on the motor shaft in sequence, and the stator is wrapped outside the rotor.
[0014] In summary, the oil seal and the motor are provided, the step is formed on the bottom of the oil seal body, the step is axially attached to the protruding part on the shell, a limiting position is generated, axial deviation of the oil seal in a long-time running process is prevented, and stable operation of the equipment is ensured.
[0015] In order to make the above features and advantages of the utility model more obvious and easy to understand, the following embodiments are specifically described in combination with the attached drawings. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The oil seal provided for embodiment 1 in the utility model is shown in the figure.
[0017] Figure 2 The cross-sectional view of the oil seal provided for embodiment 1 in the utility model is shown in the figure.
[0018] Figure 3 The assembly schematic diagram of the oil seal in the motor in embodiment 1 is shown in the figure.
[0019] Figure 4 The local enlarged view of Figure 3 is shown in the figure.
[0020] Figure 5 The cross-sectional view of the oil seal provided for embodiment 2 in the utility model is shown in the figure.
[0021] Figure 6 The assembly schematic diagram of the oil seal in the motor in embodiment 2 is shown in the figure.
[0022] Figure 7 The local enlarged view of Figure 6 is shown in the figure. DETAILED DESCRIPTION
[0023] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0024] Example 1
[0025] Figure 1 The oil seal provided by this utility model. For example... Figure 1 As shown, the oil seal 11 is a ring-shaped flexible structure, commonly used to concentrically fit onto the motor shaft to form an outer layer of protection and an internal seal. Meanwhile, to ensure the reliability of the oil seal 11, a spring 116 is installed in the spring hole of the oil seal 11 to increase the axial clamping force of the oil seal 11.
[0026] Figure 2 for Figure 1 A cross-sectional view. For example... Figure 2 As shown, the oil seal includes a bottom 111, a mating portion 112, a lip 113, a step 114, and a reinforcing skeleton 115. The lip 113 is axially fixed to the first end 1111 inside the bottom 111, the mating portion 112 is axially fixed to the first end 1111 outside the bottom 111, the step 114 is axially disposed at the second end 1112 outside the bottom 111, and the reinforcing skeleton 115 is embedded in the bottom 111 and the mating portion 112. The mating portion 112 is a portion of the first end 1111 outside the bottom 111 extending axially, the lip 113 is a portion of the first end 1111 inside the bottom 111 extending axially, and the second end 1112 outside the bottom 111 is recessed axially to form the step 114.
[0027] The reinforcing skeleton 115 is a rigid structure made of materials such as metal. The reinforcing skeleton 115 is embedded in the bottom 111 and the mating part 112, and plays the role of maintaining shape and strengthening structural support.
[0028] The bottom 111, the mating part 112, and the lip 113 are typically flexible structures made of rubber or other elastic materials, designed to create a sealed environment.
[0029] The mating part 112 will contact the inner wall of the housing to radially limit the oil seal 11, while preventing the working medium inside the equipment from leaking from the outside of the oil seal 11.
[0030] The lip 113 is radially protruded from the side of the matching part 112 to form a sealing lip 1131, and a spring slot 1132 is arranged on the wall near the side of the matching part 112. The sealing lip 1131 is in the shape of a wedge. The sealing lip 1131 is directly in contact with the surface of the motor shaft, and the sealing lip 1131 is a flexible elastic body, which can still adhere to the surface of the motor shaft under mechanical vibration or pressure change. This not only prevents the leakage of lubricating oil or liquid inside the equipment, but also prevents the invasion of external dust, moisture and other impurities into the equipment, maintains the stability of the working environment inside the equipment, avoids equipment damage, and reduces the cost of maintenance and maintenance. The spring slot 1132 is used to install the spring 116. When the oil seal 11 is coaxially sleeved on the motor shaft, the contraction force of the spring 116 will generate a certain radial tight force on the sealing lip 1131, further improving the sealing performance of the oil seal 11. In addition, an oil film will also be generated at the contact between the lip 113 and the motor shaft, which can prevent the contact between the working medium and the air, realize the sealing of the motor shaft, and reduce the friction between the oil seal 11 and the motor shaft. Wear and tear.
[0031] The step 114 is a limiting structure, which cooperates with the protruding part of the shell to realize the axial positioning of the oil seal 11, preventing the oil seal 11 from being axially offset during long-time operation.
[0032] Figure 3 The oil seal 11 is assembled with the motor 1, as shown in Figure 3 The motor 1 includes a shell 12, a motor shaft 13, an oil seal 11 and an internal component 14. The motor shaft 13 is coaxially installed with the shell 12, one end of the motor shaft 13 penetrates into the inside of the shell 12, and the oil seal 11 and the internal component 14 are coaxially sleeved on the motor shaft 13 in sequence and are wrapped by the shell 12. The internal component 14 includes a bearing 141, a stator 142 and a rotor 143. The bearing 141 and the rotor 143 are coaxially sleeved on the motor shaft 13 in sequence, and the stator 142 is wrapped outside the rotor 143. The inner wall of the shell 12 extends radially to form a protruding part 121, which is used for axially limiting the oil seal 11.
[0033] Figure 4 The oil seal 11 is assembled with the motor 1, as shown in Figure 3 The oil seal 11 is assembled with the motor 1, as shown in Figure 4As shown in the installation of the oil seal 11, the step 114 and the protruding part 121 in the shell 12 is in axial contact, the role of axial limiting; and the step 114 and the protruding part 121 and the matching part 112 and the inner wall of the shell 12 is in direct contact, the role of radial limiting. At the same time, the sealing lip 1131 and the motor shaft 13 closely, and install the spring 112 to compensate the self-tightening force, the role of sealing.
[0034] Embodiment 2
[0035] As Figure 5 The utility model provides an oil seal, the oil seal 21 includes bottom 211, cooperation department 212, lip 213, step 214 and reinforcing framework 215, the lip 213 is axially fixed in the first end 2111 of bottom 211 inside, cooperation department 212 is axially fixed in the first end 2111 of bottom 211 outside, step 214 is axially arranged in the second end 2112 of bottom 211 outside, reinforcing framework 215 is embedded in bottom 211 and cooperation department 212. Among them, the cooperation department 212 is the first end 2111 of bottom 211 outside and is formed in a part along the axial extension, the lip 213 is the first end of bottom 211 inside and is formed in a part along the axial extension 2111, and the second end 2112 of bottom 211 outside is formed into step 214 along the axial recess.
[0036] The reinforcing framework 215 is a rigid structure, which is made of metal or other materials, and is embedded in the bottom 211 and the cooperation department 212, which plays a role in maintaining shape and strengthening structural support.
[0037] The bottom 211, the cooperation department 212 and the lip 213 are usually flexible structures, which are made of rubber or other elastic materials, and are designed to form a sealed environment.
[0038] The cooperation department 212 will be in contact with the inner wall of the shell, which is used for radially limiting the oil seal 21, and at the same time prevents the working medium inside the device from leaking from the outside of the oil seal 21.
[0039] The lip 213 is radially convex to form an outer lip 2131 and an inner lip 2132. The inner lip 2132 is located at one end close to the bottom 211, and the outer lip 2131 is located at one end away from the bottom 211. A spring groove 2133 is formed on the wall of the lip 213 close to the fitting part 212. The outer lip 2131 is a wedge-shaped structure radially convex to the lip 213, and the inner lip 2132 is a tooth-shaped structure radially extending out of the lip 213. During installation, the inner lip 2132 and the outer lip 2131 are in direct contact with the surface of the motor shaft. The outer lip 2131 and the inner lip 2132 are flexible elastic bodies that can still adhere to the surface of the motor shaft under mechanical vibration or pressure changes. The outer lip 2131 is in direct contact with the external environment, which can prevent external dust, moisture and other impurities from entering the internal equipment, and also avoid equipment damage, reduce maintenance and maintenance costs; the inner lip 2132 is in direct contact with the lubricating oil or liquid in the equipment, which can prevent the leakage of working medium and maintain the stability of the internal working environment of the equipment and the reliability of the equipment.
[0040] The spring groove 2133 is connected with the outer lip 2131, and the spring groove 2133 is used for installing the spring 216. When the oil seal 21 is coaxially sleeved on the motor shaft, the contraction force of the spring 216 will generate a certain radial tight force on the lip 213, further improving the sealing performance of the oil seal 21. In addition, an oil film will also be generated at the contact between the lip 213 and the motor shaft, which can prevent the contact between the working medium and the air, realize the sealing of the motor shaft, and also reduce the friction between the oil seal 21 and the motor shaft, and reduce the wear.
[0041] The step 214 is a limiting structure, which cooperates with the protruding part of the shell to realize the axial positioning of the oil seal 21, preventing the oil seal 21 from producing axial deviation during long-time operation.
[0042] The reinforcing framework 215 is a rigid structure made of metal and other materials, which is embedded in the step 214, the bottom 211 and the fitting part 212 to maintain the shape and strengthen the structural support.
[0043] Figure 6 The assembly diagram of the oil seal 21 and the motor 2 is shown in FIG. 6. Figure 6As shown, the motor 2 includes a housing 22, a motor shaft 23, an oil seal 21, and an internal assembly 24. The motor shaft 23 is coaxially mounted with the housing 22, and one end of the motor shaft 23 extends into the interior of the housing 22. The oil seal 21 and the internal assembly 24 are sequentially coaxially mounted on the motor shaft 23 and enclosed by the housing 22. The internal assembly 24 includes a bearing 241, a stator 242, and a rotor 243. The bearing 241 and the rotor 243 are sequentially coaxially mounted on the motor shaft 23, and the stator 242 is enclosed on the outside of the rotor 243. A protruding member 221 extends radially from the inner wall of the housing 22, and the protruding member 221 is used to axially limit the oil seal 21.
[0044] Figure 7 for Figure 6 A magnified view of a portion, such as Figure 7 As shown, when installing the oil seal 21, the step 214 axially contacts the protruding component 221 inside the housing 22, creating axial limiting; while the step 214, the protruding component 221, and the mating part 212 directly contact the inner wall of the housing 22, creating radial limiting. Simultaneously, the outer lip 2131 and the inner lip 2132 are tightly fitted to the motor shaft 23, and the spring 216 is installed to compensate for the self-tightening force, thus providing a sealing function.
[0045] In summary, this utility model discloses an oil seal and a motor. By creating a step at the bottom of the oil seal body, the step axially fits against a protruding component inside the housing, creating a limiting effect and preventing the oil seal from shifting axially during long-term operation, thus ensuring stable operation of the equipment.
[0046] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.
Claims
1. An oil seal, characterized by, It includes a bottom, a lip, a matching part and a step, the lip is fixed axially at the first end of the inner side of the bottom, the matching part is fixed axially at the first end of the outer side of the bottom, the step is arranged axially at the second end of the outer side of the bottom; spring grooves are opened on the wall of the side of the lip close to the matching part, springs are installed in the spring grooves.
2. The oil seal of claim 1, wherein The side of the lip away from the matching part is radially convex to form a sealing lip, the sealing lip directly contacts the motor shaft.
3. The oil seal of claim 2, wherein The oil seal further includes a reinforcing framework, the reinforcing framework is embedded in the inside of the bottom and the matching part.
4. The oil seal of claim 1 wherein, The side of the lip away from the matching part is radially convex to form an outer lip and an inner lip, the inner lip is located at the end close to the bottom, and the outer lip is located at the end away from the bottom.
5. The oil seal of claim 4, wherein the lip is formed of a material having a Shore A hardness of at least 80. Spring grooves are opened on the wall of the side of the lip close to the matching part, the spring grooves are connected with the outer lip, and springs are installed in the spring grooves.
6. An electric machine characterized by It includes a shell, a motor shaft, an oil seal and an internal component, the motor shaft is coaxially installed with the shell, one end of the motor shaft penetrates into the inside of the shell, the oil seal and the internal component are coaxially sleeved on the motor shaft in sequence and are wrapped by the shell.
7. The electric machine of claim 6, wherein, A convex part is arranged on the inner wall of the shell, and the step axially contacts the convex part.
8. The electric machine of claim 7, wherein, The internal component includes a bearing, a stator and a rotor, the bearing and the rotor are coaxially sleeved on the motor shaft in sequence, and the stator is wrapped outside the rotor.