Motor, electric assembly and vehicle

Abstract

The utility model relates to a motor, an electric assembly and a vehicle. The motor comprises a first end cover, a rotating shaft and a gasket. Wherein the first end cover comprises a first limiting part; the rotating shaft is rotatably connected to the first end cover through a first bearing; and in the axial direction of the rotating shaft, the gasket is clamped between the first limiting part and the first bearing. According to the motor, the gasket is arranged between the first bearing and the first limiting part of the first end cover, so that the axial pre-tightening of the rotating shaft is realized, the axial movement of the rotating shaft is prevented, and the noise of the motor is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular, to a motor, an electric assembly and a vehicle. Background Art

[0002] In the related art, in order to ensure the installation stability of the first bearing of the motor, a wave spring is arranged between the end cover and the side of the first bearing, and the wave spring presses the first bearing. When the motor is in acceleration or deceleration or subjected to external impact, the motor rotor assembly will have a considerable axial string movement or the shaft will have a considerable axial free expansion when the motor rotor is running under high load, thereby causing the axial string movement of the shaft and increasing the noise of the motor. Utility Model Content

[0003] The purpose of the present disclosure is to provide a motor, an electric assembly and a vehicle. The motor achieves axial pre-tightening of the rotating shaft by arranging a gasket between the first bearing and the first limiting portion of the first end cover to prevent axial stringing of the rotating shaft and reduce the noise of the motor.

[0004] In order to achieve the above object, the present disclosure provides, in a first aspect, a motor, comprising:

[0005] A first end cover, comprising a first limiting portion;

[0006] a rotating shaft, the rotating shaft being rotatably connected to the first end cover via a first bearing; and

[0007] A gasket is sandwiched between the first limiting portion and the first bearing in the axial direction of the rotating shaft.

[0008] Optionally, the motor further includes a second bearing, and the second bearing is conductively connected to the first end cover and the rotating shaft.

[0009] Optionally, the rotating shaft includes a rotating shaft inner hole, the first end cover also includes a conductive protrusion coaxially arranged with the rotating shaft inner hole, and the second bearing sleeve is arranged on the outer periphery of the conductive protrusion and is at least partially arranged in the rotating shaft inner hole.

[0010] Optionally, the first bearing is sleeved on the outer circumference of the rotating shaft, and the inner ring of the first bearing is fixedly connected to the rotating shaft.

[0011] Optionally, the gasket is an annular planar gasket.

[0012] Optionally, the annular planar gasket is arranged between the outer ring of the first bearing and the first limiting portion.

[0013] Optionally, the first limiting portion is configured as a first limiting step corresponding to an outer ring of the first bearing.

[0014] Optionally, an elastic retaining ring is provided between the outer ring of the second bearing and the inner hole of the rotating shaft.

[0015] Optionally, the inner hole of the rotating shaft is provided with a second limiting step for installing and limiting the axial position of the elastic retaining ring.

[0016] Optionally, the elastic retaining ring is formed with a first positioning portion, and a second positioning portion cooperating with the first positioning portion is formed in the inner hole of the rotating shaft, and the first positioning portion cooperates with the second positioning portion to limit the circumferential rotation of the elastic retaining ring.

[0017] Optionally, the first positioning portion is configured as a notch provided in the elastic retaining ring;

[0018] The second positioning portion is configured as a limit stop bar which is arranged inside the inner hole of the rotating shaft and extends along the axial direction of the rotating shaft; the limit stop bar is at least partially inserted into the notch.

[0019] Optionally, the motor further comprises a second end cover arranged opposite to the first end cover, and the second end cover is connected to the rotating shaft via a third bearing.

[0020] According to a second aspect of the present disclosure, an electric assembly is provided, wherein the electric assembly includes the above-mentioned motor.

[0021] According to a third aspect of the present disclosure, a vehicle is further provided, comprising the above-mentioned motor or the above-mentioned electric assembly.

[0022] Through the above technical scheme, the motor disclosed in the present invention comprehensively considers that when the motor is in acceleration or deceleration or subjected to external impact, the rotor assembly of the motor will have a considerable degree of axial string movement or the shaft will have a considerable axial free expansion effect when the motor rotor is running at high load. Based on the axial movement of the entire motor rotor system, a gasket is arranged between the first bearing and the first limiting portion of the first end cover to achieve axial preload of the shaft, prevent axial string movement of the shaft, and reduce the noise of the motor.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0025] Figure 1 is a cross-sectional view of a motor provided in some embodiments of the present disclosure.

[0026] Figure 2It is a partially enlarged view of the cross-sectional view of the motor provided in some embodiments of the present disclosure.

[0027] Figure 3 is based on Figure 2 Enlarged view of part A in .

[0028] Figure 4 is a structural diagram of an elastic retaining ring provided in some embodiments of the present disclosure.

[0029] Figure 5 It is a side schematic diagram of a motor provided in some embodiments of the present disclosure, wherein the first end cover is hidden.

[0030] Description of Reference Numerals

[0031] 10-motor; 20-rotor assembly; 100-first end cover; 110-first limiting portion; 111-first limiting step; 120-conductive boss; 200-rotating shaft; 210-rotating shaft inner hole; 211-second limiting step; 2111-limiting stop bar; 220-second limiting portion; 300-second bearing; 400-first bearing; 400a-first side; 400b-second side; 500-gasket; 600-elastic retaining ring; 610-notch; 700-second end cover; 800-third bearing. DETAILED DESCRIPTION

[0032] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0033] In the present disclosure, unless otherwise stated, directional words such as "inside" and "outside" refer to the inside and outside of the outline of a component or structure itself. "First" and "second" are used to distinguish one element from another and do not have order or importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0034] like Figures 1 to 5 As shown, in order to achieve the above purpose, the embodiment of the present disclosure provides a motor 10, which includes a first end cover 100, a rotating shaft 200 and a gasket 500. The first end cover 100 includes a first limit portion 110; the rotating shaft 200 is rotatably connected to the first end cover 100 through a first bearing 400; in the axial direction of the rotating shaft 200, the gasket 500 is sandwiched between the first limit portion 110 and the first bearing 400.

[0035] The motor 10 takes into account that when the motor 10 is in acceleration or deceleration or subjected to external impact, the rotor assembly 20 of the motor 10 will have a considerable degree of axial string movement or the shaft 200 will have a considerable axial free expansion when the motor rotor is running at high load. Based on the axial movement of the entire motor rotor system, a gasket 500 is arranged between the first bearing 400 and the first limiting portion 110 of the first end cover 100 to achieve axial preload of the shaft 200, prevent axial string movement of the shaft 200, and reduce the noise of the motor 10.

[0036] In some embodiments, the motor 10 further includes a second bearing 300 , which is conductively connected to the first end cover 100 and the rotating shaft 200 .

[0037] It should be noted that the second bearing 300 and the first bearing 400 may be coaxially arranged, so that the rotating shaft 200 can ensure smooth rotation while also being able to conduct the current of the rotor assembly 20 .

[0038] Optionally, the shaft 200 includes a shaft inner hole 210 , the first end cover 100 also includes a conductive boss 120 coaxially arranged with the shaft inner hole 210 , and the second bearing 300 is sleeved on the outer periphery of the conductive boss 120 and at least partially arranged in the shaft inner hole 210 .

[0039] The motor 10 includes a first end cover 100, a rotating shaft 200, a second bearing 300 and a first bearing 400. The first bearing 400 may include a first side surface 400a and a second side surface 400b opposite to each other. The first end cover 100 includes a first limiting portion 110 and a conductive protrusion 120; the rotating shaft 200 is used to connect the rotor assembly 20, and the rotating shaft 200 includes a rotating shaft inner hole 210 that is sleeved in the conductive protrusion 120; the second bearing 300 is sleeved between the conductive protrusion 120 and the rotating shaft inner hole 210, so as to provide electrical conduction between the rotating shaft 200 and the conductive protrusion 120; the first bearing 400 is arranged between the rotating shaft 200 and the first end cover 100, and a gasket 500 for adjusting the axial preload between the rotating shaft 200 and the first end cover 100 is arranged between the first side surface 400a of the first bearing 400 and the first limiting portion 110 to limit the axial stringing of the rotating shaft 200.

[0040] The motor 10 disclosed in the present invention takes into account that when the motor 10 is in acceleration or deceleration or subjected to external impact, the rotor assembly 20 of the motor 10 will have a considerable degree of axial stringing or the shaft 200 will have a considerable axial free expansion effect when the motor rotor is running at high load. Based on the axial movement of the entire motor rotor system, a gasket 500 is arranged between the first side surface 400a of the first bearing 400 and the first limiting portion 110 of the first end cover 100 to achieve an axial preload between the two first bearings 400 of the shaft 200, axially constrain the axial stringing of the rotor assembly 20 to reduce or even eliminate the impact and effect of the axial stringing on the second bearing 300, avoid the inner and outer rings of the second bearing 300 from being separated due to excessive stringing of the inner and outer diameters, and stabilize the conductivity and reliability of the second bearing 300.

[0041] like Figure 1 As shown, in some embodiments, the motor 10 further includes a second end cover 700 disposed opposite to the first end cover 100, and the second end cover 700 is connected to the rotating shaft 200 via a third bearing 800. The first end cover 100 and the second end cover 700 are respectively disposed at opposite ends of the axial direction of the rotating shaft 200, and the first end cover 100 and the second end cover 700 are respectively connected to the rotating shaft 200 via a first bearing 400 and a third bearing 800 to meet the rotation of the rotating shaft 200 and the rotor assembly 20 connected to the rotating shaft 200. It can be understood that the first bearing 400 and the third bearing 800 are coaxially arranged. By arranging a gasket 500 between the first limiting portion 110 of the first end cover 100 and the outer side surface of the corresponding first bearing 400, a preload force is applied between the first bearing 400 and the third bearing 800 in the axial direction of the rotating shaft 200, thereby axially restraining the rotating shaft 200 and the rotor assembly 20 from moving in series, avoiding separation of the inner and outer rings of the second bearing 300, avoiding affecting the conductive performance, and ensuring the reliability of conductive performance.

[0042] The first bearing 400 and the third bearing 800 may adopt any suitable bearing structure. In some embodiments, when the motor 10 is in acceleration and deceleration or subjected to external impact, in order to further reduce the axial force of the rotating shaft, in some embodiments, for example, the first bearing 400 and the third bearing 800 may be constructed as four-point contact bearings. In addition, the first bearing 400 and the third bearing 800 may also adopt, for example, angular contact bearings or tapered roller bearings, etc., which are not specifically limited here.

[0043] like Figure 1 and Figure 2As shown, optionally, the first bearing 400 is sleeved on the outer periphery of the rotating shaft 200, and the inner ring of the first bearing 400 is fixedly connected to the rotating shaft 200. That is, the inner ring of the first bearing 400 can be interference connected to the outer side wall of the rotating shaft 200. In order to limit the second side surface 400b of the first bearing 400, the outer side wall of the rotating shaft 200 is formed with a second limiting portion 220, and the second limiting portion 220 abuts against the second side surface 400b of the first bearing 400. Among them, the outer wall of the rotating shaft 200 can be formed with a mounting portion which is recessed toward the central axis direction of the rotating shaft 200 and is used for interference fit with the inner ring of the first bearing 400, and the axial inner end of the mounting portion forms a second limiting portion 220, which abuts against the second side surface 400b of the first bearing 400 away from the first end cover 100, and the first bearing 400 is axially limited by the first limiting portion 110 of the first end cover 100 and the second limiting portion 220 of the rotating shaft 200.

[0044] It should be noted that the outer ring of the first bearing 400 and the first end cover 100 may also be interference fit, so as to realize the rotation of the rotating shaft 200.

[0045] Optionally, the gasket 500 is an annular planar gasket that is disposed between the outer ring of the first bearing 400 and the first limiting portion 110 .

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the first limiting portion 110 is configured as a first limiting step 111 corresponding to the outer ring of the first bearing 400, and the gasket 500 is disposed between the first limiting step 111 and the outer ring of the first bearing 400. The first limiting step 111 is an axially sunken structure, the first limiting step 111 corresponds to the outer ring of the first bearing 400, and the gasket 500 is disposed between the first limiting step 111 and the outer ring of the first bearing 400, for axially resisting the first bearing 400 to prevent axial movement thereof. The gasket 500 includes but is not limited to an annular plane gasket.

[0047] For example, it can be a rigid flat gasket, which, compared with the related art, further avoids the axial stringing of the rotating shaft 200 caused by the axial movement of the first bearing 400, thereby causing the separation between the inner and outer rings of the guide bearing arranged between the conductive boss 120 and the inner hole 210 of the rotating shaft, affecting the conductive performance.

[0048] It should be noted that the conductive protrusion 120 can be coaxially arranged with the above-mentioned first limiting step 111, and at the same time coaxially arranged with the rotating shaft 200, so as to facilitate installation and improve the rotation stability.

[0049] In order to improve the connection effect between the second bearing 300 and the inner hole 210 of the rotating shaft and the conductive protrusion 120, and improve the conductivity, in some embodiments, one of the conductive protrusion 120 and the inner hole 210 of the rotating shaft is interference-fitted with the second bearing 300, and the other is electrically connected to the second bearing 300 through an elastic retaining ring 600. The elastic retaining ring 600 can reliably connect the other of the conductive protrusion 120 and the inner hole 210 of the rotating shaft to the second bearing 300, thereby avoiding the conductive performance being affected by the matching relationship between the two.

[0050] It should be noted that the elastic retaining ring 600 is configured to be able to conduct electricity, that is, it can achieve electrical conduction between the rotating shaft 200 and the second bearing 300 , or achieve electrical conduction between the second bearing 300 and the conductive protrusion 120 .

[0051] In some embodiments of the present disclosure, the inner ring of the second bearing 300 is interference-mounted on the conductive boss 120, and an elastic retaining ring 600 is provided between the outer ring of the second bearing 300 and the inner hole 210 of the rotating shaft. The outer diameter of the elastic retaining ring 600 matches the inner hole 210 of the rotating shaft, and the inner diameter of the elastic retaining ring 600 matches the outer ring of the second bearing 300. The elastic retaining ring 600 radially fixes the outer ring of the second bearing 300 by applying a radial elastic force, and a reliable connection between the outer ring of the second bearing 300 and the inner hole 210 of the rotating shaft is achieved through the elastic retaining ring 600.

[0052] In some embodiments, the inner hole 210 of the rotating shaft is provided with a second limiting step 211 for installing and limiting the axial position of the circlip 600. A partial area of ​​the circlip 600 is installed in the inner hole 210 of the rotating shaft and one side of the axial direction abuts against the second limiting step 211, thereby limiting the axial movement of the circlip 600 and further improving the installation reliability of the second bearing 300.

[0053] In order to prevent the elastic retaining ring 600 from circumferential sliding between the second bearing 300 and the inner hole 210 of the rotating shaft, in some embodiments of the present disclosure, the elastic retaining ring 600 is formed with a first positioning portion, and the inner hole 210 of the rotating shaft is formed with a second positioning portion that cooperates with the first positioning portion. The first positioning portion cooperates with the second positioning portion to limit the circumferential rotation of the elastic retaining ring 600.

[0054] The first positioning portion and the second positioning portion can be constructed using any suitable structure, such as Figure 2 , Figure 3 and Figure 4As shown, in some embodiments, the first positioning portion is configured as a notch 610 provided in the elastic retaining ring 600. For example, the notch 610 may be a notch formed on the elastic retaining ring 600, or may be a disconnected portion between the first end and the second end of the elastic retaining ring 600, that is, a circumferentially disconnected circumferential opening; the second positioning portion is configured as a limit stop bar 2111 provided inside the inner hole 210 of the rotating shaft and extending along the axial direction of the rotating shaft 200, and the limit stop bar 2111 is at least partially inserted into the notch 610. Among them, the inner hole 210 of the rotating shaft 200 is provided with a rotation limit stop bar 2111, which is used to be inserted into the notch 610 of the elastic retaining ring 600 to control the circumferential creep of the elastic retaining ring 600, the outer ring of the second bearing 300 cooperates with the elastic retaining ring 600, and the inner diameter of the second bearing 300 is limited by interference fit with the conductive protrusion 120 of the first end cover 100.

[0055] The motor 10 comprises a first end cover 100, a gasket 500, a first bearing 400, an elastic retaining ring 600, a second bearing 300, a rotating shaft 200, a rotor assembly 20, and a second end cover 700. On the one hand, the axial movement of the rotating shaft 200 can be prevented to avoid noise; on the other hand, the shaft current generated by the rotor assembly 20 during the operation of the motor is transmitted to the first end cover 100 through the rotating shaft 200, the elastic retaining ring 600, and the second bearing 300, and then transmitted to the vehicle ground through the first end cover 100, so as to avoid the shaft current accumulating in the rotor assembly 20 and flowing out through the first bearing 400, thereby causing the first bearing 400 to be damaged by electro-corrosion and affecting the performance and reliability of the motor 10. Among them, the motor 10 of the new energy vehicle comprehensively considers that the motor 10 is in acceleration and deceleration or subjected to external impact, and the motor's rotor assembly 20 will have a considerable degree of axial stringing or the motor rotor will have a considerable axial free expansion when the motor rotor is running at high load. Therefore, the motor 10 of the new energy vehicle considers its axial movement based on the entire motor rotor system, and selects a gasket 500 (flat gasket) solution to achieve axial preload on the first bearing 400 and the third bearing 800, axially constraining the axial stringing of the rotor assembly 20 to greatly reduce the impact and effect of the axial stringing on the second bearing 300, and avoid the second bearing 300 The inner and outer diameter stringing is too large, resulting in the separation of the inner and outer rings, so as to stabilize the conductivity and reliability of the second bearing 300.

[0056] The embodiment of the present disclosure further provides an electric assembly, which includes the above-mentioned motor 10. Therefore, the electric assembly also has all the advantages of the above-mentioned motor 10, which will not be repeated here.

[0057] In some embodiments, the motor 10 also includes a rotor assembly 20, which is mounted on the rotating shaft 200 and can rotate with the rotating shaft 200. When the motor 10 is in acceleration or deceleration or subjected to external impact, the rotor assembly 20 of the motor will have a considerable degree of axial stringing or the rotating shaft 200 will have a considerable axial free expansion when the motor rotor is running at high load. The present disclosure comprehensively considers that when the motor 10 is in acceleration or deceleration or subjected to external impact, the rotor assembly 20 of the motor 10 will have a considerable degree of axial stringing or the shaft 200 will have a considerable axial free expansion effect when the motor rotor is running at high load. Based on the axial movement of the entire motor rotor system, a gasket 500 is arranged between the first side surface 400a of the first bearing 400 and the first limiting portion 110 of the first end cover 100 to achieve an axial preload between the two first bearings 400 of the shaft 200, axially constrain the axial stringing of the rotor assembly 20 to reduce or even eliminate the impact and effect of the axial stringing on the second bearing 300, avoid the inner and outer rings of the second bearing 300 from being separated due to excessive stringing of the inner and outer diameters, and stabilize the conductivity and reliability of the second bearing 300.

[0058] It should be noted that the electric assembly may be a motor 10 of a new energy vehicle.

[0059] An embodiment of the present disclosure also provides a vehicle, which may include the motor 10 provided in the above embodiment or include the electric assembly provided in the above embodiment. Therefore, the vehicle also has all the advantages of the above electric assembly or the above motor 10, which will not be repeated here.

[0060] The motor, electric assembly and vehicle disclosed in the present invention can be applied to vehicles, such as new energy vehicles, and have the following advantages:

[0061] The motor considers the installation and performance of the second bearing 300 from the perspective of the rotor assembly 20 system, and adopts a gasket 500 to better restrain the axial play of the first bearing 400, which can better balance the situation when the motor is in acceleration or deceleration or subjected to external impact. The motor rotor assembly 20 will have a considerable amount of axial play. On the one hand, it can reduce the motor noise; on the other hand, it can better avoid the instantaneous axial play of the rotor assembly 20 and the axial impact mainly borne by the conductive grease, which will cause the second bearing 300 to climb seriously and cause the inner and outer rings of the second bearing 300 to separate and fail, thereby greatly improving the conductivity and life of the motor.

[0062] The inner ring of the second bearing 300 of the motor is interference fixed with the conductive boss 120, and the outer ring and the elastic retaining ring 600 are pre-pressed and radially matched with the second limiting step 211 of the inner hole 210 of the rotating shaft, and a limiting stop bar 2111 for circumferential limiting is arranged in the second limiting step 211, and the limiting stop bar 2111 matches the circumferential opening of the elastic retaining ring 600, so as to limit the creep of the outer ring of the second bearing 300 during the long-term operation of the motor and avoid affecting the conductive durability performance.

[0063] The first bearing 400 at least close to one end of the second bearing 300 of the present invention is configured as a four-point contact bearing. Since its axial clearance is much lower than that of a conventional bearing, it can better limit the axial stringing and axial impact of one end of the second bearing 300, thereby avoiding the impact on the second bearing 300 and affecting its conductive effect and life.

[0064] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0066] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A motor, characterized in that: include: A first end cover, comprising a first limiting portion; A rotating shaft, the rotating shaft being rotatably connected to the first end cover via a first bearing; and A gasket is sandwiched between the first limiting portion and the first bearing in the axial direction of the rotating shaft.

2. The motor according to claim 1, characterized in that The motor further includes a second bearing, which is electrically conductively connected to the first end cover and the rotating shaft.

3. The motor according to claim 2, characterized in that The rotating shaft includes an inner hole of the rotating shaft, the first end cover also includes a conductive convex column coaxially arranged with the inner hole of the rotating shaft, and the second bearing sleeve is arranged on the outer periphery of the conductive convex column and is at least partially arranged in the inner hole of the rotating shaft.

4. The motor according to any one of claims 1 to 3, characterized in that: The first bearing is sleeved on the outer periphery of the rotating shaft, and the inner ring of the first bearing is fixedly connected to the rotating shaft.

5. The motor according to any one of claims 1 to 3, characterized in that: The gasket is an annular plane gasket.

6. The motor according to claim 5, characterized in that The annular plane gasket is arranged between the outer ring of the first bearing and the first limiting portion.

7. The motor according to any one of claims 1 to 3, characterized in that: The first limiting portion is configured as a first limiting step corresponding to the outer ring of the first bearing.

8. The motor according to claim 3, characterized in that An elastic retaining ring is arranged between the outer ring of the second bearing and the inner hole of the rotating shaft.

9. The motor according to claim 8, characterized in that The inner hole of the rotating shaft is provided with a second limiting step for installing and limiting the axial position of the elastic retaining ring.

10. The motor according to claim 9, characterized in that The elastic retaining ring is formed with a first positioning portion, and the inner hole of the rotating shaft is formed with a second positioning portion that cooperates with the first positioning portion. The first positioning portion cooperates with the second positioning portion to limit the circumferential rotation of the elastic retaining ring.

11. The motor according to claim 10, characterized in that The first positioning portion is configured as a notch provided in the elastic retaining ring; The second positioning portion is configured as a limit stop bar disposed inside the inner hole of the rotating shaft; the limit stop bar is at least partially inserted into the notch.

12. The motor according to claim 1, characterized in that The motor further comprises a second end cover arranged opposite to the first end cover, and the second end cover is connected to the rotating shaft via a third bearing.

13. An electric assembly, characterized in that: The electric assembly comprises the electric motor as claimed in any one of claims 1-12.

14. A vehicle, characterized in that: The vehicle comprises the motor according to any one of claims 1 to 12 or the electric assembly according to claim 13.

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