Electric drive oil seal suitable for being assembled on automobile hub

Abstract

The electrically-driven oil seal comprises an outer oil seal body and an inner oil seal body, a first framework is fixed to the upper portion of the right side of the outer oil seal body, a fourth framework is fixedly connected to the lower portion of the right side of the outer oil seal body, and a third framework is fixed to the left side of the upper end of the inner oil seal body. A second framework is arranged on the right side of the outer oil seal and located between the first framework and the fourth framework. A first rubber layer is arranged above the left side of the outer oil seal, polytetrafluoroethylene is arranged between the first framework and the second framework, and the right end of the fourth framework is connected with a second rubber layer. According to the electrically-driven oil seal suitable for being assembled on the automobile hub, the double-layer structure design of the inner oil seal and the outer oil seal is adopted, the rubber layer on the outer oil seal is of a polytetrafluoroethylene structure, the water sealing and dust preventing effects are achieved, meanwhile, the sealing face on the inner oil seal is coated with a special lubricating coating, and therefore the oil seal can be normally sealed, and the service life of the oil seal is prolonged. The service life of the oil seal is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile wheel hub oil seal, specifically to a kind of applicable assembly in automobile wheel hub electric drive oil seal. BACKGROUND

[0002] In the automobile wheel hub electric drive system, motor, gear, bearing and other components will generate a large amount of heat in the process of high-speed operation, which needs to be cooled and lubricated by lubricating oil to ensure the normal operation and service life of these components; At the same time, in order to prevent the dust, soil, rainwater and other pollutants from the outside into the drive system, causing wear and corrosion to the components, affecting the performance and reliability of the system, effective sealing measures also need to be taken; As a key sealing component in the drive system, the automobile wheel hub electric drive oil seal can form a reliable seal between the rotating shaft and the stationary shell, effectively prevent lubricating oil leakage and external pollutants from entering, thereby providing strong protection for the normal operation of the drive system.

[0003] During driving, the wheel hub electric drive system will face various complex and harsh working environments, which puts high requirements on the performance of the oil seal; In terms of high temperature, a large amount of heat generated by the motor, controller and transmission components during operation will cause the internal temperature of the drive system to rise sharply, resulting in changes in the performance of the oil seal material, such as aging, hardening and loss of elasticity of rubber material, thereby affecting the sealing performance of the oil seal; In terms of high-speed rotation, as the driving speed of the automobile increases, the speed of the wheel hub motor will also increase accordingly, which will intensify the friction between the oil seal and the shaft, generate a large amount of heat, not only affect the performance of the oil seal material, but also cause the oil seal to wear out, shorten the service life of the oil seal; In addition, the automobile will encounter various complex road conditions during driving, such as bumpy road, potholed road, speed bump, etc., which will cause the wheels to be subjected to frequent impact and vibration, and the impact and vibration will be transmitted to the oil seal, causing the oil seal to be subjected to additional stress, and the oil seal will be prone to fatigue damage, such as cracking of the sealing lip, delamination of the rubber material, etc., thereby causing the sealing performance of the oil seal to fail, so we propose the automobile wheel hub electric drive oil seal applicable assembly can well solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of applicable assembly in automobile wheel hub electric drive oil seal to solve the above background technology proposed current market existing automobile wheel hub electric drive oil seal in use, with the heat inside drive system sharp rise, make the performance of oil seal material change, cause the wear and tear of oil seal to intensify, shorten the service life of oil seal, while oil seal is subjected to additional stress, long-term in this kind of complex stress state, oil seal is prone to fatigue damage.

[0005] To achieve the above object, the utility model provides the following technical scheme: A kind of suitable for being assembled in automobile hub electric drive oil seal, including outer oil seal and inner oil seal, the upper right side of outer oil seal is fixed with first skeleton, and the lower right side of outer oil seal is fixedly connected with fourth skeleton, the left side of the upper end of inner oil seal is fixed with third skeleton, second skeleton is provided between the right side of outer oil seal and fourth skeleton;It further includes: the upper left side of outer oil seal is provided with first rubber layer, polytetrafluoroethylene is arranged between the first skeleton and second skeleton, the right end of fourth skeleton is connected with second rubber layer, and spring groove is formed in the left side of second rubber layer, and stainless steel spring is mounted in the inside of spring groove, the right side of the upper end of inner oil seal is provided with third rubber layer.

[0006] Preferably, the outer oil seal and the first rubber layer are connected by vulcanization bonding, the first rubber layer is externally provided with a groove structure with a wavy cross section, and the first rubber layer, the second rubber layer and the third rubber layer are made of fluororubber material.

[0007] Preferably, the inner oil seal and the third rubber layer are connected by vulcanization bonding, and the third rubber layer is externally provided with a groove structure with a wavy cross section.

[0008] Preferably, the fourth skeleton and the second rubber layer are connected by vulcanization bonding, the second rubber layer is in interference fit with the inner oil seal to form dynamic sealing, and the sealing surface of the inner oil seal is sprayed with a lubricating coating.

[0009] Preferably, the polytetrafluoroethylene inside the outer oil seal is positioned by the first skeleton and the second skeleton, the first skeleton and the second skeleton are arranged in an "L" shape, the polytetrafluoroethylene is in interference fit with the inner oil seal to form dynamic sealing.

[0010] Preferably, the wavy structure of the outer oil seal contacts the surface of the oil seal assembly hole to form static sealing, and the contact stress is generated according to the assembly process and after assembly.

[0011] Preferably, the outer diameter size of the wavy structure of the outer oil seal and the radius of the circular ring are different, the outer diameter size of the outer oil seal is different, and the outer oil seal adopts a steel body structure.

[0012] Compared with the prior art, the utility model has the beneficial effects that: the oil seal suitable for being assembled in automobile hub electric drive adopts a double-layer structure design of inner oil seal and outer oil seal, the rubber layer on the outer oil seal is added with polytetrafluoroethylene structure to realize the effect of water sealing and dust prevention, the sealing surface of the inner oil seal is sprayed with a lubricating coating to prolong the service life of the oil seal while meeting the normal sealing of the oil seal, and the specific contents are as follows:

[0013] (1) The oil seal can maintain good sealing effect under various working conditions, effectively prevents lubricating oil leakage and external impurities from entering, and the application of new materials and the optimized structure design significantly improve the wear resistance and high temperature resistance of the oil seal, so that the oil seal can adapt to the high speed, high load and complex vibration and impact working conditions of the hub electric drive, ensures the stable operation of the electric drive system, and reduces the failure rate of the vehicle.

[0014] (2) After the oil seal is installed, the contraction force of the stainless steel spring can further increase the radial pressure of the outer oil seal and the inner oil seal on the rotating shaft. During the rotation of the shaft, even if the oil seal lip is slightly loose due to wear and other factors, the stainless steel spring can continuously provide pressure to ensure that the lip is always closely attached to the shaft.

[0015] (3) When the shaft of the hub electric drive rotates, under the action of the lubricating oil pressure, the oil will penetrate between the outer oil seal and the inner oil seal and the rotating shaft, forming an extremely thin oil film. The oil film is affected by the surface tension of the oil, and a crescent surface is formed between the rotating shaft and the outer edge of the inner oil seal. Due to the existence of the oil film, a dynamic seal is formed between the inner oil seal lip and the rotating shaft, preventing the lubricating oil from leaking outward. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a main section structure schematic view of the utility model;

[0017] Figure 2 It is an inner oil seal section structure schematic view of the utility model;

[0018] Figure 3 It is an outer oil seal section structure schematic view of the utility model;

[0019] Figure 4 It is a three-dimensional structure schematic view of the utility model;

[0020] Figure 5 It is a three-dimensional structure schematic view of the first skeleton, the second skeleton and polytetrafluoroethylene of the utility model.

[0021] In the drawing: 1, first rubber layer; 2, outer oil seal; 3, first skeleton; 4, second skeleton; 5, third skeleton; 6, inner oil seal; 7, fourth skeleton; 8, polytetrafluoroethylene; 9, stainless steel spring; 10, second rubber layer; 11, third rubber layer. DETAILED DESCRIPTION

[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] Please refer to Figures 1-5 The present application provides the following technical solutions: a kind of suitable for assembling in automobile hub electric drive oil seal;

[0024] Embodiment one: in order to solve the existing automobile hub electric drive oil seal in prior art when in use, with the heat inside the driving system sharply increases, the performance of oil seal material changes, leading to the wear of oil seal aggravates, shortens the service life of oil seal, at the same time, oil seal is subjected to additional stress, long-term in this complex stress state, oil seal is prone to fatigue damage problem, therefore, the following scheme is disclosed, specific reference Figures 1-5 As shown in the figure, including outer oil seal 2 and inner oil seal 6, the upper right side of outer oil seal 2 is fixed with first skeleton 3, and the lower right side of outer oil seal 2 is fixedly connected with fourth skeleton 7, the left side of the upper end of inner oil seal 6 is fixed with third skeleton 5, and the right side between first skeleton 3 and fourth skeleton 7 of outer oil seal 2 is provided with second skeleton 4;It also includes: the upper left side of outer oil seal 2 is provided with first rubber layer 1, and outer oil seal 2 and first rubber layer 1 are connected by vulcanization bonding, the first rubber layer 1 is externally provided with groove structure with wavy cross section, the first rubber layer 1, second rubber layer 10 and third rubber layer 11 are made of fluorine rubber material, polytetrafluoroethylene 8 is arranged between first skeleton 3 and second skeleton 4, the right side of the upper end of inner oil seal 6 is provided with third rubber layer 11, and inner oil seal 6 and third rubber layer 11 are connected by vulcanization bonding, the third rubber layer 11 is externally provided with groove structure with wavy cross section, fourth skeleton 7 and second rubber layer 10 are connected by vulcanization bonding, second rubber layer 10 and inner oil seal 6 are interference fit and form dynamic seal, and the sealing surface of inner oil seal 6 is sprayed with lubricating coating.

[0025] In the free state, the inner oil seal 6 lip inner diameter is smaller than the hub motor shaft diameter, and there is a certain interference, after installation, the inner oil seal 6 blade will be due to the interference and the initial radial pressure on the rotating shaft, so that the inner oil seal 6 lip and the shaft surface are in close contact, and the outer oil seal 2 and the inner oil seal 6 sealing lip are usually made of rubber or polyurethane and other materials, which have good elasticity and wear resistance, in the working process, the sealing lip can adapt to the small vibration, swing and thermal expansion and contraction of the hub shaft, and always maintain good contact with the shaft surface, maintain the sealing performance, the outer oil seal 2 and the inner oil seal 6 material itself has the barrier property, can prevent the lubricating oil from leaking out through the oil seal body, at the same time, also can prevent the external dust, moisture, impurities and other impurities from entering the hub motor inside, avoid these impurities to cause the abrasion, corrosion or other damage to the motor, bearing and other components, ensure the normal operation of the hub motor system, and the use of polytetrafluoroethylene 8 structure plus rubber lip structure design, the oil seal can maintain good sealing effect under various working conditions, effectively prevent the lubricating oil from leaking and the external impurities from entering, and the application of new materials and the optimization of structure design, significantly improve the wear resistance and high temperature resistance of the oil seal, so that the oil seal can adapt to the high speed, high load and complex vibration and impact working conditions of the hub motor, ensure the stable operation of the electric drive system, reduce the failure rate of the vehicle.

[0026] Example two: different from example one, this embodiment utilizes the stainless steel spring 9 to continuously provide pressure, to ensure that the lip and the shaft are always in close contact, for details, please refer to Figure 1 and Figure 3 It is shown that the right end of the fourth skeleton 7 is connected with the second rubber layer 10, and the left side of the second rubber layer 10 is provided with a spring groove, and the inside of the spring groove is installed with the stainless steel spring 9.

[0027] After the installation of the oil seal, the contraction force of the stainless steel spring 9 will further increase the radial pressure of the outer oil seal 2 and the inner oil seal 6 on the rotating shaft, and even if the oil seal lip is slightly loose due to wear and other factors during the rotation of the shaft, the stainless steel spring 9 can continuously provide pressure to ensure that the lip and the shaft are always in close contact.

[0028] Example three: different from example two, this embodiment utilizes the dynamic sealing between the inner oil seal 6 lip and the rotating shaft, which can prevent the lubricating oil from leaking outwards, for details, please refer to Figures 1-5As shown, the outer oil seal 2 corrugated surface contacts the oil seal assembly hole surface to form a static seal, and according to the contact stress generated during assembly and after assembly, the outer diameter size of the outer oil seal 2 corrugated surface and the size of the circular ring radius are different, the outer diameter size of the outer oil seal 2 is different, and the outer oil seal 2 adopts a steel body structure, the polytetrafluoroethylene 8 inside the outer oil seal 2 is pressed and positioned by the first skeleton 3 and the second skeleton 4, and the first skeleton 3 and the second skeleton 4 are arranged in the shape of "L", and the polytetrafluoroethylene 8 is in interference fit with the inner oil seal 6 to form a dynamic seal.

[0029] When the hub electric drive shaft rotates, under the action of lubricating oil pressure, oil will seep into the gap between the outer oil seal 2 and the inner oil seal 6 and the rotating shaft, forming an extremely thin oil film, which is affected by the surface tension of the oil, forming a crescent on the outer edge of the rotating shaft and the inner oil seal 6 gap, due to the existence of the oil film, a dynamic seal is formed between the inner oil seal 6 lip and the rotating shaft, preventing the lubricating oil from leaking outward, when the shaft is stationary, the oil film between the outer edge of the outer oil seal 2 and the cavity and the residual oil film between the oil seal lip and the shaft will form a static seal, preventing oil from seeping out in a stationary state, and the contact pressure between the outer oil seal 2 lip and the shaft is evenly distributed, which can effectively fill the possible small gap and further enhance the static sealing effect.

[0030] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0031] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A kind of suitable for assembling in automobile wheel hub electric drive oil seal, including outer oil seal (2) and inner oil seal (6), the upper right side of the outer oil seal (2) is fixed with first skeleton (3), and the lower right side of the outer oil seal (2) is fixedly connected with fourth skeleton (7), the left side of the upper end of the inner oil seal (6) is fixed with third skeleton (5), the right side of the outer oil seal (2) between first skeleton (3) and fourth skeleton (7) is provided with second skeleton (4);It is characterized in that, Also include: The upper left side of the outer oil seal (2) is provided with a first rubber layer (1), the first skeleton (3) and the second skeleton (4) are provided with polytetrafluoroethylene (8), the right end of the fourth skeleton (7) is connected with the second rubber layer (10), and the left side of the second rubber layer (10) is provided with a spring groove, and the inside of the spring groove is provided with a stainless steel spring (9), and the upper end of the inner oil seal (6) is provided with a third rubber layer (11).

2. A seal for fitting to an electrically driven wheel hub of a vehicle according to claim 1, wherein: The outer oil seal (2) and the first rubber layer (1) are connected by vulcanization bonding, the outer part of the first rubber layer (1) is provided with a groove structure with a wave-shaped cross section, the first rubber layer (1), the second rubber layer (10) and the third rubber layer (11) are made of fluorine rubber material.

3. A seal for fitting to an electrically driven wheel hub of a vehicle as claimed in claim 1, wherein: The inner oil seal (6) and the third rubber layer (11) are connected by vulcanization bonding, and the outer part of the third rubber layer (11) is provided with a groove structure with a wave-shaped cross section.

4. The oil seal for electric drive assembly of automobile wheel hub according to claim 1, characterized in that: The fourth skeleton (7) and the second rubber layer (10) are connected by vulcanization bonding, the second rubber layer (10) and the inner oil seal (6) are interference fit and form dynamic sealing, and the sealing surface of the inner oil seal (6) is sprayed with lubricating coating.

5. A seal for fitting to an electrically driven wheel hub of a vehicle as claimed in claim 1, wherein: The polytetrafluoroethylene (8) in the outer oil seal (2) is positioned by the first skeleton (3) and the second skeleton (4), and the first skeleton (3) and the second skeleton (4) are provided in "L" shape, the polytetrafluoroethylene (8) and the inner oil seal (6) are interference fit to form dynamic sealing.

6. A seal for fitting to an electrically driven wheel hub of a vehicle as claimed in claim 1, wherein: The wave-shaped iron structure of the outer oil seal (2) contacts the surface of the oil seal assembly hole to form static sealing, and the contact stress generated during assembly and after assembly.

7. A seal for fitting to an electrically driven wheel hub of a vehicle as claimed in claim 1, wherein: The outer diameter size and the radius of the circular ring of the wave-shaped outer oil seal (2) are different, the outer diameter size of the outer oil seal (2) is different, and the outer oil seal (2) adopts a steel body structure.

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