A bridge drive motor with an oil shield and a motor

Abstract

The utility model discloses a kind of oil shield and motor for bridge drive motor, belong to motor technical field, oil shield includes annular body, the side end face of body is provided with annular first concave-convex structure, the edge of body is bent to form fin to the side away from first concave-convex structure;Motor includes motor casing and the stator assembly and rotor assembly installed in motor casing, one end of motor casing is provided with end cover, rotor shaft outside of rotor assembly is sleeved with above-mentioned oil shield, oil shield is fixedly connected with rotor shaft;When bridge end lubricating oil leaks, oil shield can be respectively in static and dynamic two kinds of working conditions, effectively reduce the negative influence of oil or impurity in oil liquid to motor oil seal, greatly improve oil seal life, also reduce the repair rate of motor, when bridge end lubricating oil leaks and leads to electric drive bridge system failure, can guarantee motor not to be influenced to the maximum, reduce maintenance cost for customer.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to an oil baffle for a bridge drive motor and the motor itself. Background Technology

[0002] The new energy vehicle industry is developing rapidly, and the reliability of electric drive axle systems, as the mainstream drive solution for light trucks in the commercial vehicle sector, has attracted much attention. The axle reducer, as a key component, is particularly vulnerable to oil leaks that can affect overall performance. This is because the current mainstream electric drive axle design involves a drive motor flange connected to the axle housing, forming a sealed cavity between the motor and the housing. The motor shaft is connected to the axle shaft, and oil seals are installed on both shafts for sealing. However, unlike the axle shaft oil seals, the motor is a water-cooled motor, lacking internal oil for lubrication and cooling of the oil seals. When the vehicle travels downhill at high speeds for extended periods (resulting in passive motor overspeed), the dry friction between the oil seal and the shaft causes premature oil seal failure due to high temperatures. While the motor oil seal failure itself does not pose a safety issue, when the axle shaft oil seal also fails abnormally, lubricating oil from the axle housing leaks into the cavity and along the shaft into the motor, causing motor failure.

[0003] To address the issue of high temperature due to dry friction in motor oil seals, the industry typically selects high-speed oil seals with a PTFE (polytetrafluoroethylene) coating. However, the coating on the oil seal is relatively thin and requires a high level of cleanliness. When oil leakage occurs at the bridge end, impurities in the oil will accelerate the wear of the oil seal, leading to premature failure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an oil baffle and motor for a bridge drive motor, which can effectively reduce the negative impact of oil or impurities in the oil on the motor oil seal, greatly improve the oil seal life, and reduce the motor repair rate, thereby reducing maintenance costs for customers.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] An oil baffle for a bridge drive motor includes an annular body, one end face of which is provided with an annular first concave-convex structure, and the edge of the body is bent away from the first concave-convex structure to form fins.

[0007] Furthermore, the first concave-convex structure consists of at least two spaced-apart annular flanges.

[0008] Furthermore, it also includes a tubular mounting portion, with the main body connected to the outside of the mounting portion.

[0009] Furthermore, the body is connected to the outer side of one end of the mounting part, and the end of the mounting part connected to the body is on the same side as the side of the body where the concave-convex structure is provided.

[0010] Furthermore, the main body and the mounting part are integrally formed using a stainless steel casting process.

[0011] An electric motor includes a motor housing and a stator assembly and a rotor assembly installed within the motor housing. One end of the motor housing is provided with an end cover, and the aforementioned oil baffle is fitted onto the outside of the rotor shaft of the rotor assembly. The oil baffle is fixedly connected to the rotor shaft.

[0012] Furthermore, the end cap is provided with a second concave-convex structure that cooperates with the first concave-convex structure of the oil baffle, and the first concave-convex structure and the second concave-convex structure cooperate to form a loop-shaped sealing structure.

[0013] Furthermore, the second concave-convex structure consists of at least two spaced-apart annular grooves.

[0014] Furthermore, the mounting portion of the oil baffle is interference-fitted to the outside of the rotor shaft.

[0015] Furthermore, the gap between the rotor shaft and the inner wall of the mounting portion is filled with adhesive.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are:

[0017] In the oil baffle for the bridge drive motor disclosed in this utility model, when the lubricating oil at the bridge end leaks, the oil usually flows most easily along the shaft at the bridge end towards the motor side. At this time, the fins on the oil baffle will effectively prevent the oil from flowing. At the same time, when the amount of lubricating oil leaking from the bridge end is large and almost fills the cavity between the bridge and the motor, the first concave-convex structure on the oil baffle can cooperate with the structure on the motor end cover to form a U-shaped seal, which can effectively prevent large particles of impurities from accumulating around the oil seal and aggravating its wear. Furthermore, when the motor rotates, the oil baffle will also rotate with it. The centrifugal force will make it difficult for the oil to accumulate around the oil baffle, thereby reducing the possibility of oil entering the motor.

[0018] In the motor disclosed in this utility model, since the aforementioned oil baffle is installed on the rotor shaft, when the bridge end lubricating oil leaks, the oil baffle can effectively reduce the negative impact of oil or impurities in the oil on the motor oil seal under both static and dynamic working conditions, greatly improving the oil seal life; at the same time, it reduces the motor repair rate. When the bridge end lubricating oil leak causes the electric drive bridge system to malfunction, it can ensure that the motor is not affected to the greatest extent, reducing maintenance costs for customers. Attached Figure Description

[0019] Figure 1This is a cross-sectional structural schematic diagram of the oil baffle for the bridge drive motor of this utility model;

[0020] Figure 2 This is a structural schematic diagram of the oil baffle assembly surface;

[0021] Figure 3 This is a structural schematic diagram of the non-assembly surface of the oil baffle.

[0022] Figure 4 This is an assembly diagram of the motor with an oil baffle installed and the axle housing.

[0023] Figure 5 yes Figure 4 Enlarged diagram of section A in the middle;

[0024] In the figure, 1-oil baffle, 11-body, 12-fin, 13-first concave-convex structure, 14-mounting part, 21-rotor shaft, 22-end cover, 23-motor oil seal, 24-second concave-convex structure, 31-bridge housing, 32-rotor shaft. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0026] Example 1:

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, an oil baffle for a bridge drive motor includes an annular body 11. One end face of the body 11 is provided with an annular first concave-convex structure 13, which is used to cooperate with a structure on the motor end cover 22 to form a U-shaped seal. The edge of the body 11 is bent away from the first concave-convex structure 13 to form fins 12, which can effectively prevent oil from the bridge end from flowing into the motor along the shaft 32.

[0028] The spiral sealing structure formed by the fins 12 and the first concave-convex structure 13 and the structure on the motor end cover 22 can both prevent oil from flowing into the motor. The combination of the two can more effectively prevent oil from flowing into the motor, reduce the negative impact of oil or impurities in the oil on the motor oil seal 23, and greatly improve the oil seal life.

[0029] The first concave-convex structure 13 can be a protrusion or a groove. In this application, the first concave-convex structure 13 is preferably a protrusion, and at least two protrusions are required to ensure a sealing effect. Since the oil baffle 1 rotates with the motor, centrifugal force makes it difficult for oil to accumulate around the oil baffle 1, thereby reducing the possibility of oil entering the motor, the first concave-convex structure 13 needs to be annular. Therefore, in this application, the first concave-convex structure 13 consists of at least two spaced-apart annular flanges.

[0030] Preferably, in this application, the oil baffle 1 further includes a tubular mounting portion 14, with the main body 11 connected to the outside of the mounting portion 14. Specifically, the main body 11 is connected to the outside of one end of the mounting portion 14, and the end of the mounting portion 14 connected to the main body 11 is located on the same side as the side of the main body 11 with the concave-convex structure. The main body 11 and the mounting portion 14 are integrally formed using a cast stainless steel process. The mounting portion 14 can be interference-fitted with the motor rotor shaft 21, preventing oil from flowing into the motor from the gap between the mounting portion 14 and the rotor shaft 21.

[0031] Example 2:

[0032] like Figure 4 and Figure 5 As shown, an electric motor includes a motor housing and a stator assembly and a rotor assembly installed within the motor housing. An end cover 22 is provided at one end of the motor housing. An oil baffle 1, as described in Embodiment 1, is fitted onto the outer side of the rotor shaft 21 of the rotor assembly, and the oil baffle 1 is fixedly connected to the rotor shaft 21. After the bridge-end rotating shaft 32 is connected to the motor's rotor shaft 21, the fins 12 on the oil baffle 1 effectively prevent oil from flowing into the motor along the rotating shaft 32. When the motor rotates, the oil baffle 1 also rotates accordingly. Centrifugal force makes it difficult for oil to accumulate around the oil baffle 1, thereby reducing the possibility of oil entering the motor.

[0033] like Figure 5 As shown, the end cover 22 is provided with a second concave-convex structure 24 that cooperates with the first concave-convex structure 13 of the oil baffle 1. The first concave-convex structure 13 and the second concave-convex structure 24 cooperate to form a loop-shaped sealing structure. When the leakage of lubricating oil at the bridge end is large, almost filling the cavity between the bridge housing 31 and the motor end cover 22, the first concave-convex structure 13 and the second concave-convex structure 24 cooperate to form a loop-shaped sealing structure, which can effectively prevent large particles of impurities from accumulating around the motor oil seal 23 and aggravating its wear. Among them, the second concave-convex structure 24 is composed of at least two spaced annular grooves, which has a good sealing effect and can also meet the requirements of relative rotation between the oil baffle 1 and the end cover 22.

[0034] In this application, the mounting portion 14 of the oil baffle 1 is interference-fitted onto the outside of the rotor shaft 21, which facilitates installation and effectively reduces the clearance between the mounting portion 14 and the rotor shaft 21. Before installation, the oil baffle 1 undergoes dynamic balancing and weight reduction treatment. During assembly, an interference fit is used to ensure that the oil baffle 1 and the rotor shaft 21 are installed concentrically, minimizing abnormal shaking of the rotor shaft 21 caused by dynamic imbalance of the parts, and helping to reduce uneven wear of the oil seal.

[0035] The gap between the rotor shaft 21 and the inner wall of the mounting part 14 is filled with glue. During assembly, glue is first applied to the rotor shaft 21, and then the oil baffle 1 is installed. The glue plays an auxiliary sealing role, which can further improve the sealing between the mounting part 14 and the rotor shaft 21. Since the rotor shaft 21 does not easily heat up, the glue is less likely to age and fall off after solidification.

[0036] This utility model discloses an oil baffle for a bridge drive motor and a motor. By setting fins on the oil baffle and setting a U-shaped sealing structure between the oil baffle and the motor end cover, when the bridge end lubricating oil leaks, the oil baffle can effectively reduce the negative impact of oil or impurities in the oil on the motor oil seal under both static and dynamic conditions, greatly improving the oil seal life. At the same time, it also reduces the motor repair rate. When the bridge end lubricating oil leak causes the electric drive bridge system to malfunction, it can ensure that the motor is not affected to the greatest extent, reducing maintenance costs for customers.

[0037] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0038] In the description of this specification, unless otherwise expressly defined, the terms "setup", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0039] While specific embodiments of this utility model have been described above, those skilled in the art should understand that the described embodiments are merely some, not all, embodiments of this utility model. These are merely illustrative examples, and the scope of protection of this utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model and without any inventive effort, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An oil baffle for a bridge drive motor, characterized in that, It includes an annular body (11), one end face of which is provided with an annular first concave-convex structure (13), and the edge of the body (11) is bent away from the first concave-convex structure (13) to form a fin (12).

2. The oil baffle for a bridge drive motor according to claim 1, characterized in that, The first concave-convex structure (13) consists of at least two spaced-apart annular flanges.

3. The oil baffle for a bridge drive motor according to claim 2, characterized in that, It also includes a tubular mounting part (14), and the main body (11) is connected to the outside of the mounting part (14).

4. The oil baffle for a bridge drive motor according to claim 3, characterized in that, The main body (11) is connected to the outer side of one end of the mounting part (14), and the end of the mounting part (14) connected to the main body (11) is on the same side as the side of the main body (11) where the first concave-convex structure (13) is provided.

5. The oil baffle for a bridge drive motor according to claim 4, characterized in that, The main body (11) and the mounting part (14) are integrally formed by casting stainless steel.

6. An electric motor, comprising a motor housing and a stator assembly and a rotor assembly mounted within the motor housing, wherein an end cap (22) is provided at one end of the motor housing, characterized in that, The rotor shaft (21) of the rotor assembly is fitted with an oil baffle (1) as described in any one of claims 3 to 5, and the oil baffle (1) is fixedly connected to the rotor shaft (21).

7. The motor according to claim 6, characterized in that, The end cap (22) is provided with a second concave-convex structure (24) that cooperates with the first concave-convex structure (13) of the oil baffle (1). The first concave-convex structure (13) and the second concave-convex structure (24) cooperate to form a spiral sealing structure.

8. The motor according to claim 7, characterized in that, The second concave-convex structure (24) consists of at least two spaced-apart annular grooves.

9. The motor according to claim 6, characterized in that, The mounting part (14) of the oil baffle (1) is interference-fitted to the outside of the rotor shaft (21).

10. The motor according to claim 9, characterized in that, The gap between the rotor shaft (21) and the inner wall of the mounting part (14) is filled with glue.

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