Test tool clamp

Abstract

The test tool clamp comprises a supporting arm assembly, a contact disc assembly and a driving mechanism, and the supporting arm assembly comprises a first supporting arm and a second supporting arm which are oppositely arranged; the contact disc assembly is arranged at one end of the support arm assembly and comprises a first contact disc and a second contact disc which are oppositely arranged, the first contact disc is mounted on the first support arm, and the second contact disc is mounted on the second support arm; the driving mechanism is arranged at the end, away from the contact disc assembly, of the supporting arm assembly and is in transmission connection with the first supporting arm and the second supporting arm, and the driving mechanism can drive the first contact disc and the second contact disc to move oppositely or oppositely through the first supporting arm and the second supporting arm. When the first contact disc and the second contact disc move oppositely, the first contact disc and the second contact disc can clamp two nylon plugs at the output end of a speed reducer in the electric driving force assembly. The testing tool clamp can be used for clamping two nylon plugs at the output ends of speed reducers in different types of electric driving force assemblies.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tooling fixtures, in particular to a test tooling fixture. BACKGROUND

[0002] The environmental box is a commonly used test equipment for the development test of the electric drive power assembly of a new energy vehicle, and is widely applied in the automobile industry. With the improvement of test methods and the deepening of test research, various types of electric drive power assembly test environmental boxes have appeared, such as high-low temperature environmental boxes, temperature shock boxes, ice water immersion boxes, etc. The environmental box is used to simulate the operation of the electric drive power assembly under different environmental temperature conditions, and to comprehensively test and evaluate the protection function and reliability of the electric drive power assembly shell.

[0003] When the electric drive power assembly is in the environmental test in the environmental box, a sealing connector is used to seal the electric drive power assembly, so that the inside of the electric drive power assembly is isolated from the outside environment. For the output end of the reducer in the electric drive power assembly, a nylon plug is usually made to plug the output end of the reducer. However, during high-temperature environmental testing, the air in the electric drive power assembly cavity expands due to heating, and the oil vaporizes, etc., which causes the air pressure in the electric drive power assembly cavity to increase, and the nylon plug on the output end of the reducer is easy to fall off, resulting in the failure of the sealing of the electric drive power assembly cavity. Therefore, during high-temperature environmental testing, a test tooling fixture is needed to clamp the nylon plug on the output end of the reducer in the electric drive power assembly to prevent the nylon plug from falling off from the output end of the reducer in the electric drive power assembly.

[0004] At present, the existing test tooling fixture is a G-shaped structure, which includes a fixture body, a screw rod and a movable chuck. The screw rod is installed at one end of the fixture body and is screwed with the fixture body. By rotating the screw rod, the movable chuck on the screw rod and the fixed chuck on the fixture body can clamp the nylon plug on the output end of the reducer in the electric drive power assembly. In addition, in order to adapt to different models of electric drive power assemblies, the screw rod usually has a long stroke, so that when the test tooling fixture is installed on a large-sized electric drive power assembly, a long screw rod will be extended, thereby requiring a high-temperature environmental test box to have a large working space. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a test tooling fixture which can solve the above technical problems.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A test tooling fixture, the test tooling fixture comprising:

[0008] A support arm assembly comprising a first support arm and a second support arm, the first support arm and the second support arm being arranged opposite to each other;

[0009] a contact disc assembly disposed at one end of the arm assembly, the contact disc assembly comprising a first contact disc and a second contact disc disposed oppositely, the first contact disc being mounted on the first arm, the second contact disc being mounted on the second arm;

[0010] a driving mechanism disposed at an end of the arm assembly distal to the contact disc assembly and in driving connection with the first arm and the second arm respectively, the driving mechanism being capable of driving the first contact disc and the second contact disc to move towards or away from each other through the first arm and the second arm;

[0011] when the first contact disc and the second contact disc move towards each other, the first contact disc and the second contact disc are capable of clamping two nylon plugs on an output end of a reduction gear in an electric driving assembly.

[0012] In one embodiment, the driving mechanism comprises a connecting crossbar, two ends of the connecting crossbar being hingedly connected with the first arm and the second arm respectively.

[0013] In one embodiment, the driving mechanism further comprises a driving assembly, the driving assembly comprising a first adjusting rod, a second adjusting rod and a driving sleeve, the first adjusting rod being hingedly connected with the first arm and being screwed with the driving sleeve, the second adjusting rod being hingedly connected with the second arm and being screwed with the driving sleeve, wherein a screwing direction between the driving sleeve and the first adjusting rod is opposite to a screwing direction between the driving sleeve and the second adjusting rod.

[0014] In one embodiment, a length of the first arm between the connecting crossbar and the first adjusting rod is less than a length of the first arm between the connecting crossbar and the first contact disc.

[0015] a length of the second arm between the connecting crossbar and the second adjusting rod is less than a length of the second arm between the connecting crossbar and the second contact disc.

[0016] In one embodiment, the driving sleeve comprises a first screw sleeve and a second screw sleeve, the first screw sleeve and the second screw sleeve being arranged at two ends of the driving sleeve.

[0017] the first screw sleeve being sleeved on and screwed with the first adjusting rod, the second screw sleeve being sleeved on and screwed with the second adjusting rod.

[0018] In one embodiment, a first bending rod is formed on the first arm, and the first contact plate is mounted on the first bending rod;

[0019] A second bending rod is formed on the second arm, and the second contact plate is mounted on the second bending rod.

[0020] In one embodiment, a first connecting ball is provided on the first arm, and the first connecting ball is rotatably connected to the first contact plate;

[0021] And / or, the second arm is provided with a second connecting ball, which is rotatably connected to the second contact plate.

[0022] In one embodiment, both the first arm and the second arm are configured as telescopic structures.

[0023] In one embodiment, the connecting crossbar is configured as a telescopic structure so that the distance between the first arm and the second arm in the length direction of the connecting crossbar can be adjusted.

[0024] In one embodiment, a first retaining ring is formed on the first contact plate, the first retaining ring being used to engage with a nylon plug on the output end of the reducer in the electric drive assembly.

[0025] And / or, a second retaining ring is formed on the second contact plate, the second retaining ring being used to engage with a nylon plug on the output end of the reducer in the electric drive assembly.

[0026] Due to the application of the above solution, this application has the following advantages compared with the prior art:

[0027] The test fixture claimed in this application uses a drive mechanism to drive a first contact plate and a second contact plate to move in opposite directions via a first arm and a second arm. The first and second contact plates, moving in opposite directions, clamp two nylon plugs on the output end of the reducer in the electric drive assembly to prevent the nylon plugs from falling off. In this process, the test fixture as a whole does not require a large working space in the height direction of the electric drive assembly, so that the test fixture can be used to clamp two nylon plugs on the output end of the reducer in different models of electric drive assemblies within the same high-temperature environmental test chamber. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the test fixture provided in an embodiment of the present application when it clamps two nylon plugs on the output end of the reducer in the electric drive assembly.

[0030] Figure 2 This is a schematic diagram of the structure of a test fixture provided in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the structure of the first arm provided in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the structure of the second contact plate provided in an embodiment of this application.

[0033] Reference numerals: 100, Test fixture; 11, First support arm; 111, First connecting ball; 112, First bending rod; 113, Support arm sleeve; 114, Support arm inner rod; 1141, Slide groove; 115, Locking screw; 116, First connecting lug; 12, Second support arm; 121, Second connecting ball; 122, Second bending rod; 123, Second connecting lug; 21, First contact plate; 211, First arc groove; 212, First retaining ring; 22, Second contact plate; 221, Second arc groove; 222, Second retaining ring; 31, Connecting crossbar; 32, First adjusting rod; 33, Second adjusting rod; 34, Drive sleeve; 341, First threaded sleeve; 342, Second threaded sleeve; 200, Electric drive assembly; 300, Nylon plug. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0036] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0039] like Figures 1 to 4As shown, a test fixture 100 provided in one embodiment of this application includes a support arm assembly (not shown), a contact plate assembly (not shown), and a drive mechanism (not shown). The support arm assembly includes a first support arm 11 and a second support arm 12, which are disposed opposite to each other. The contact plate assembly is disposed at one end of the support arm assembly and includes a first contact plate 21 and a second contact plate 22 disposed opposite to each other. The first contact plate 21 is mounted on the first support arm 11, and the second contact plate 22 is mounted on the second support arm 12. The drive mechanism is disposed at one end of the support arm assembly away from the contact plate assembly and is connected to the first support arm 11 and the second support arm 12 respectively. The drive mechanism can drive the first contact plate 21 and the second contact plate 22 to move towards or away from each other through the first support arm 11 and the second support arm 12. When the first contact plate 21 and the second contact plate 22 move towards each other, the first contact plate 21 and the second contact plate 22 can clamp two nylon plugs 300 on the output end of the reducer in the electric drive force assembly 200.

[0040] It is understood that when the test fixture 100 is working, the drive mechanism drives the first contact plate 21 and the second contact plate 22 to move towards each other through the first arm 11 and the second arm 12. The first contact plate 21 and the second contact plate 22 moving towards each other clamp the two nylon plugs 300 on the output end of the reducer in the electric drive assembly 200 to prevent the nylon plugs 300 from falling off the output end of the reducer in the electric drive assembly 200. During this process, the test fixture 100 as a whole does not require a large working space in the height direction of the electric drive assembly 200, so that the test fixture 100 can be used to clamp the two nylon plugs 300 on the output end of the reducer in different models of electric drive assemblies 200 in the same high temperature environment test chamber.

[0041] like Figure 1 , Figure 3As shown, in one embodiment, a first connecting ball 111 is provided on the first arm 11, and the first connecting ball 111 is rotatably connected to the first contact plate 21; and / or, a second connecting ball 121 is provided on the second arm 12, and the second connecting ball 121 is rotatably connected to the second contact plate 22. Preferably, the first contact plate 21 and the second contact plate 22 are rotatably connected by the corresponding first connecting ball 111 and the corresponding second connecting ball 121, so that the first contact plate 21 and the second contact plate 22 can be adjusted in position when clamping the nylon plug 300. This reduces the positional accuracy requirement of the test fixture 100 during operation, so that the test fixture 100 can be flexibly adjusted according to the actual working conditions, thereby facilitating the clamping operation of the test fixture 100 on the two nylon plugs 300. Here, a first arc-shaped groove 211 is provided on the first contact plate 21, and the first connecting ball 111 is rotatably connected to the first arc-shaped groove 211; correspondingly, a second arc-shaped groove 221 is provided on the second contact plate 22, and the second connecting ball 121 is rotatably connected to the second arc-shaped groove 221.

[0042] like Figure 2 , Figure 3 As shown, in one embodiment, a first bending rod 112 is formed on the first support arm 11, and a first contact plate 21 is mounted on the first bending rod 112; a second bending rod 122 is formed on the second support arm 12, and a second contact plate 22 is mounted on the second bending rod 122. This allows for a smaller gap between the first contact plate 21 and the second contact plate 22, satisfying the requirement for the first contact plate 21 and the second contact plate 22 to clamp the two nylon plugs 300. Here, the first bending rod 112 and the second bending rod 122 are arranged facing each other, and a first connecting ball 111 is disposed on one end of the first bending rod 112, and a second connecting ball 121 is disposed on one end of the second bending rod 122.

[0043] like Figure 2 , Figure 3As shown, in one embodiment, both the first arm 11 and the second arm 12 are configured as telescopic structures. This allows the lengths of the first arm 11 and the second arm 12 to be adjusted, enabling the test fixture 100, located at the same position, to clamp nylon plugs 300 at different positions, and to adapt the test fixture 100 to different models of electric drive assemblies 200. Here, the first arm 11 includes an arm sleeve 113, an inner arm rod 114, and a locking screw 115. The arm sleeve 113 is telescopically fitted onto the inner arm rod 114, wherein the inner arm rod 114 has a sliding groove 1141, and the locking screw 115 passes through the arm sleeve 113, inserts into the sliding groove 1141, and is screwed onto the arm sleeve 113. When the length of the first support arm 11 needs to be adjusted, the locking screw 115 can be loosened first. This allows the inner rod 114 to be pulled out or inserted into the support arm sleeve 113, thus adjusting the overall length of the first support arm 11. During this process, the sliding fit between the locking screw 115 and the slide groove 1141 can be used as a guide to guide the inner rod 114 in and out of the support arm sleeve 113. Finally, the locking screw 115 is tightened to lock the inner rod 114 into the support arm sleeve 113. It should be noted that the specific structure of the second support arm 12 and how it extends and retracts during operation can be referenced from the specific structure and length adjustment method of the first support arm 11, and will not be repeated here.

[0044] like Figure 1 , Figure 2 As shown, in one embodiment, both the first contact plate 21 and the second contact plate 22 are configured as disc-shaped structures. This increases the contact area between the first contact plate 21 and the second contact plate 22 and the corresponding nylon plug 300 on the output end of the reducer in the electric drive assembly 200, thereby improving the stability of the first contact plate 21 and the second contact plate 22 when clamping the corresponding nylon plug 300.

[0045] like Figure 1 , Figure 2As shown, in one embodiment, a first retaining ring 212 is formed on the first contact plate 21, and the first retaining ring 212 is used to engage with the nylon plug 300 on the output end of the reducer in the electric drive assembly 200; and / or, a second retaining ring 222 is formed on the second contact plate 22, and the second retaining ring 222 is used to engage with the nylon plug 300 on the output end of the reducer in the electric drive assembly 200. Preferably, a first retaining ring 212 is formed on the first contact plate 21, and a second retaining ring 222 is formed on the second contact plate 22. By using the first retaining ring 212 and the second retaining ring 222 to engage with the corresponding nylon plugs 300 on the output end of the reducer in the electric drive assembly 200, the test fixture 100 can be positioned on the two nylon plugs 300 on the output end of the reducer in the electric drive assembly 200. This prevents the test fixture 100 from slipping off the two nylon plugs 300 on the output end of the reducer in the electric drive assembly 200 due to external forces, thereby further improving the stability of the test fixture 100 when holding the two nylon plugs 300 on the output end of the reducer in the electric drive assembly 200.

[0046] like Figure 1 , Figure 2 As shown, in one embodiment, the drive mechanism includes a connecting crossbar 31, the two ends of which are hinged to the first arm 11 and the second arm 12, respectively.

[0047] Preferably, such as Figure 1 , Figure 2 As shown, the first arm 11 is provided with a first connecting lug 116, and the first arm 11 can be hinged to the connecting crossbar 31 through the first connecting lug 116, so that the first arm 11 can swing around the connection node where the first arm 11 and the connecting crossbar 31 are hinged. Similarly, the second arm 12 is provided with a second connecting lug 123, and the second arm 12 can be hinged to the connecting crossbar 31 through the second connecting lug 123, so that the second arm 12 can swing around the connection node where the second arm 12 and the connecting crossbar 31 are hinged.

[0048] like Figure 2 As shown, in one embodiment, the connecting crossbar 31 is configured as a telescopic structure, allowing the distance between the first arm 11 and the second arm 12 along the length of the connecting crossbar 31 to be adjusted. This enables the test fixture 100, located in the same position, to clamp nylon plugs 300 at different positions, and allows the test fixture 100 to be adapted to different models of electric drive assemblies 200. It should be noted that the specific structure of the connecting crossbar 31 and how it extends and retracts during operation can be referenced from the specific structure and length adjustment method of the first arm 11, and will not be repeated here.

[0049] like Figure 2 As shown, in one embodiment, the drive mechanism further includes a drive assembly (not shown). The drive assembly includes a first adjusting rod 32, a second adjusting rod 33, and a drive sleeve 34 on the side of the connecting crossbar 31 away from the contact plate assembly. The first adjusting rod 32 is hinged to the first support arm 11 and screwed to the drive sleeve 34. The second adjusting rod 33 is hinged to the second support arm 12 and screwed to the drive sleeve 34. The threaded connection direction between the drive sleeve 34 and the first adjusting rod 32 is opposite to the threaded connection direction between the drive sleeve 34 and the second adjusting rod 33. Here, the drive sleeve 34 includes a first threaded sleeve 341 and a second threaded sleeve 342, which are arranged at both ends of the drive sleeve 34. The first threaded sleeve 341 is fitted onto the first adjusting rod 32 and screwed to it, and the second threaded sleeve 342 is fitted onto the second adjusting rod 33 and screwed to it.

[0050] As can be seen from the above, when the test fixture 100 of this embodiment is working, by rotating the drive sleeve 34 forward or backward, and utilizing the opposite direction of the threaded connection between the drive sleeve 34 and the first adjusting rod 32 and the second adjusting rod 33, the first adjusting rod 32 and the second adjusting rod 33 can be driven to move away from or towards each other. At the same time, the first adjusting rod 32 and the second adjusting rod 33 can respectively drive the first contact plate 21 and the second contact plate 22 to move towards or away from each other through the corresponding first support arm 11 and the corresponding second support arm 12, making the operation simple. Here, the hinge node between the first adjusting rod 32 and the first support arm 11 is set on the end of the first support arm 11 away from the first contact plate 21; and the hinge node between the second adjusting rod 33 and the second support arm 12 is set on the end of the second support arm 12 away from the second contact plate 22.

[0051] like Figure 2 As shown, in one embodiment, the length of the portion of the first arm 11 located between the connecting crossbar 31 and the first adjusting rod 32 is less than the length of the portion of the first arm 11 located between the connecting crossbar 31 and the first contact plate 21; the length of the portion of the second arm 12 located between the connecting crossbar 31 and the second adjusting rod 33 is less than the length of the portion of the second arm 12 located between the connecting crossbar 31 and the second contact plate 22. This allows the test fixture 100 to maximize the stroke of the first contact plate 21 on the first arm 11 and the second contact plate 22 on the second arm 12 when they move in opposite directions, utilizing the lever principle, by requiring only a small force to rotate the drive sleeve 34. This reduces labor intensity.

[0052] It should be noted that the driving mechanism of this application is not limited to the connecting crossbar 31 and driving assembly described above. Those skilled in the art can also replace the connecting crossbar 31 with a tension spring (not shown in the figure); or replace the connecting crossbar 31 with a tension spring (not shown in the figure) and the driving assembly with the connecting crossbar 31. These will not be elaborated here.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A testing fixture, characterized in that, The test fixture (100) includes: The outrigger assembly includes a first outrigger (11) and a second outrigger (12), wherein the first outrigger (11) and the second outrigger (12) are disposed opposite to each other. A contact plate assembly is disposed at one end of the support arm assembly. The contact plate assembly includes a first contact plate (21) and a second contact plate (22) disposed opposite to each other. The first contact plate (21) is mounted on the first support arm (11), and the second contact plate (22) is mounted on the second support arm (12). A drive mechanism is disposed on one end of the support arm assembly away from the contact plate assembly, and is connected to the first support arm (11) and the second support arm (12) respectively. The drive mechanism can drive the first contact plate (21) and the second contact plate (22) to move towards each other or in opposite directions through the first support arm (11) and the second support arm (12). When the first contact plate (21) and the second contact plate (22) move toward each other, the first contact plate (21) and the second contact plate (22) can clamp the two nylon plugs (300) on the output end of the reducer in the electric drive assembly (200).

2. The test fixture according to claim 1, characterized in that, The driving mechanism includes a connecting crossbar (31), the two ends of which are hinged to the first support arm (11) and the second support arm (12), respectively.

3. The test fixture according to claim 2, characterized in that, The driving mechanism further includes a driving assembly, which includes a first adjusting rod (32), a second adjusting rod (33), and a driving sleeve (34). The first adjusting rod (32) is hinged to the first support arm (11) and screwed to the driving sleeve (34). The second adjusting rod (33) is hinged to the second support arm (12) and screwed to the driving sleeve (34). The threaded connection direction between the driving sleeve (34) and the first adjusting rod (32) is opposite to the threaded connection direction between the driving sleeve (34) and the second adjusting rod (33).

4. The test fixture according to claim 3, characterized in that, The length of the portion of the first support arm (11) located between the connecting crossbar (31) and the first adjusting rod (32) is less than the length of the portion of the first support arm (11) located between the connecting crossbar (31) and the first contact plate (21). The length of the portion of the second arm (12) located between the connecting crossbar (31) and the second adjusting rod (33) is less than the length of the portion of the second arm (12) located between the connecting crossbar (31) and the second contact plate (22).

5. The test fixture according to claim 3, characterized in that, The drive sleeve (34) includes a first threaded sleeve (341) and a second threaded sleeve (342), with the first threaded sleeve (341) and the second threaded sleeve (342) arranged at both ends of the drive sleeve (34); The first threaded sleeve (341) is fitted onto the first adjusting rod (32) and screwed onto the first adjusting rod (32), and the second threaded sleeve (342) is fitted onto the second adjusting rod (33) and screwed onto the second adjusting rod (33).

6. The test fixture according to claim 1, characterized in that, A first bending rod (112) is formed on the first support arm (11), and the first contact plate (21) is mounted on the first bending rod (112); A second bending rod (122) is formed on the second arm (12), and the second contact plate (22) is mounted on the second bending rod (122).

7. The test fixture according to claim 1, characterized in that, The first arm (11) is provided with a first connecting ball (111), which is rotatably connected to the first contact plate (21); And / or, a second connecting ball (121) is provided on the second arm (12), and the second connecting ball (121) is rotatably connected to the second contact plate (22).

8. The test fixture according to claim 1, characterized in that, Both the first arm (11) and the second arm (12) are configured as telescopic structures.

9. The test fixture according to claim 2, characterized in that, The connecting crossbar (31) is configured as a telescopic structure so that the distance between the first arm (11) and the second arm (12) in the length direction of the connecting crossbar (31) can be adjusted.

10. The test fixture according to claim 1, characterized in that, A first retaining ring (212) is formed on the first contact plate (21), and the first retaining ring (212) is used to be inserted into the nylon plug (300) on the output end of the reducer in the electric drive assembly (200); And / or, a second retaining ring (222) is formed on the second contact plate (22), the second retaining ring (222) being used to engage with a nylon plug (300) on the output end of the reducer in the electric drive assembly (200).

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