CN220816505U - Conductive ring, oil-cooled motor and transmission - Google Patents

Abstract

The utility model relates to a conductive ring, an oil-cooled motor and a transmission. The conductive ring comprises a body, wherein the body is a hollow cylinder and is provided with a first side wall; the plurality of convex supporting structures comprise connecting ends and tail ends, wherein the connecting ends and the body are integrally formed, and the tail ends extend towards the axial direction of the body; each protruding support structure is further provided with at least one inner cavity, the inner cavities are perpendicular to the axial direction of the body, and channels are formed between adjacent protruding support structures by extending the inner cavities through the body; the conductive fiber bundles are received via the lumen. The conducting ring leads the redundant charges generated by the mechanical friction of the electric drive system to be conducted out in time in a grounded manner, thereby effectively reducing the electric corrosion influence of the bearing and improving the durability of the bearing. In addition, channels, also known as "oil grooves," are formed between adjacent ones of the raised support structures to assist in the more lubricated rotation of the conductive ring and bearing.

Description

Conductive ring, oil-cooled motor and transmission

Technical Field

The utility model relates to the field of variable frequency drive motors, in particular to a conducting ring, an oil cooling motor and a transmission.

Background

The bearing is a mechanical basic part for supporting a rotating shaft or other moving bodies, and requires complex processing technology for supporting. The bearing has wide application in the industries of automobiles, high-speed rails and traditional machinery. Taking the automobile industry as an example, in recent years, the bearing consumption of the automobile industry accounts for 42.10% of the total bearing industry. The application parts of the automobile bearing mainly comprise an engine, a transmission system, an electric drive system, a steering system, auxiliary parts and the like.

The transmission system, the electric drive system or the servo motor has higher requirements on the bearing.

For automotive bearings, the problem of galvanic corrosion is inevitable in the development of drive trains or electric drive systems. In a traditional 400V electric drive system, steel ball bearing electric corrosion is very common; in 800V high voltage systems, however, as SiC substrate inverters are used on a large scale, the high voltage and high switching frequency further exacerbate the occurrence of galvanic corrosion.

In order to solve the problem of electric corrosion, a conductive ring with fiber bundles is arranged outside a part of bearings of the automobile. The transmission system or the electric drive system of the automobile is used for driving the bearing to rotate, and the conductive fiber bundles of the conductive ring lead out the electric charges of the transmission system or the electric drive system to be grounded.

In the existing conducting ring, considering that the fibers are soft, the conducting effect is poor due to the fact that the fibers are too long, so that the inside diameter of the conducting ring is very close to the outer surface of the conducting ring, a large amount of oil passes through an oil lubrication motor shaft, and lubricating oil only can pass through gaps between the bearing and the conducting ring. As the motor power and oil quantity are larger and larger, the oil passing speed between the conducting ring and the bearing is also faster and faster, and the oil pressure is increased. Excessive oil pressure can cause the existing conductive fiber bundles to float on the surface of engine oil and even deform, so that the conductivity of the conductive ring is reduced and the protective performance is reduced.

Accordingly, it is desirable to provide a conductive ring that can realize a large excess oil amount without decreasing the conductivity.

Disclosure of Invention

The utility model aims to provide a conducting ring, an oil-cooled motor and a speed changer, which are characterized in that a plurality of conducting fiber bundles extending out of the inner cavities of a convex supporting structure are used for arranging channels between the convex supporting structures, so that the electric corrosion is reduced, and simultaneously, the flow of large oil is allowed.

According to a first aspect of the present utility model, there is provided a conductive ring. The conductive ring includes:

The body is a hollow cylinder and is provided with a first side wall;

The plurality of convex supporting structures comprise connecting ends and tail ends, wherein the connecting ends are integrally formed with the body, and the tail ends extend towards the axial direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

a bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening.

In a preferred embodiment, the conductive ring includes a plurality of protruding support structures, each having one or more internal cavities thereon.

In a preferred embodiment, the protruding support structure is a trapezoid or a rectangle with an axial length of 0.5mm to 15mm.

In a preferred embodiment, the channel is defined by the body inner surface, the sides of the protruding support structure adjacent thereto, and the sides of the protruding support structure and the body inner surface are smoothly connected.

In a preferred embodiment, the conductive fiber bundles are secured to the inner cavity by physical crimping to deform the inner cavity and pinch the conductive fiber bundles.

According to another aspect of the present utility model, there is provided an oil-cooled motor, the motor comprising:

the motor is provided with a rotating shaft, oil is used as a cooling medium, a conducting ring is arranged between the motor shaft and the shell,

The conductive ring has a plurality of protruding support structures, including a connection end and a tip end, the connection end is formed integrally with the body, and the tip end extends toward the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

a bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening.

The extending end of the conductive fiber bundle contacts the motor rotating part, and the body of the conductive ring is fixedly connected with the motor shell.

According to yet another aspect of the present utility model, a transmission is provided. The transmission includes:

The gear is connected with the motor shaft through the gear or the spline; the transmission is provided with a conductive ring.

The conductive ring has a plurality of protruding support structures, including a connection end and a tip end, the connection end is formed integrally with the body, and the tip end extends toward the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

a bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening.

The extending end of the conductive fiber bundle contacts the rotating part of the speed changer, and the body of the conductive ring is fixedly connected with the shell of the speed changer.

The utility model provides a conductive ring, an oil cooling motor and a speed changer, which are provided with a plurality of convex supporting structures, wherein conductive fiber bundles extend out of the inner cavity of the convex supporting structures; and a plurality of first fixed orifices are arranged, and the conductive fiber bundles are fixed in a physical crimping mode, so that redundant charges generated by mechanical friction of an electric drive system are timely conducted out in a grounded mode, thereby effectively reducing the electric corrosion influence of the bearing and improving the durability of the bearing. In addition, channels, also known as "oil grooves," are formed between adjacent ones of the raised support structures to assist in the more lubricated rotation of the conductive ring and bearing. According to the conductive ring, the inner ring forms a plurality of channels, and lubricating oil can only pass through the channels between the bearing and the conductive ring. Along with the motor power is bigger and bigger, the oil mass is bigger and bigger, and the speed of passing oil between conducting ring and the bearing is also faster and faster, and a large amount of quick-flowing engine oil can pass through the channel in time, reaches the effect of partial pressure, keeps oil pressure stable, has avoided current conducting ring when big oil mass passes through, and the conducting fiber bundle floats on the engine oil surface, takes place the problem of deformation even.

Other features of the present utility model and its advantages will become more apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

The utility model may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of a conductive ring according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the conductive ring of FIG. 1 taken along line A-A;

FIG. 3 is a schematic view of a conductive ring according to another embodiment of the present utility model;

FIG. 4 is a cross-sectional view of the conductive ring of FIG. 3 taken along line A-A;

FIG. 5 is a schematic view showing a structure of a conductive fiber bundle fixing sleeve according to an embodiment of the present utility model;

FIG. 6 is a view of the conductive fiber bundle fixing sleeve I of the embodiment of FIG. 5 in a direction;

FIG. 7 is a view of another embodiment of a wire-fiber cluster fixing jacket I in the direction;

FIG. 8 is a view in the O-direction of the conductive fiber bundle fixing sleeve of one embodiment of the present utility model in FIG. 5;

FIG. 9 is a schematic view of a conductive ring according to another embodiment of the present utility model;

Fig. 10 is a schematic structural view of a conductive ring according to another embodiment of the present utility model.

Description of the drawings:

100. Conductive ring

110. Protruding supporting structure

120. First fixing hole

130. Conductive fiber bundle

140. Channel

150. Second fixing hole

160. Body

200. Conductive fiber bundle fixing sleeve

210. A first opening

220. A second opening

230. Conductive fiber bundle

Note that in the embodiments described below, the same reference numerals are used in common between different drawings to denote the same parts or parts having the same functions, and a repetitive description thereof may be omitted. In this specification, like reference numerals and letters are used to designate like items, and thus once an item is defined in one drawing, no further discussion thereof is necessary in subsequent drawings.

For ease of understanding, the positions, dimensions, ranges, etc. of the respective structures shown in the drawings and the like may not represent actual positions, dimensions, ranges, etc. Accordingly, the disclosed invention is not limited to the disclosed positions, dimensions, ranges, etc. as illustrated in the drawings. Moreover, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. Those skilled in the art will appreciate that they are merely illustrative of exemplary ways in which the utility model may be practiced, and not exhaustive.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

A first aspect of the utility model provides a conductive ring. Referring to fig. 1, fig. 1 is a schematic structural diagram of a conductive ring according to an embodiment of the utility model. As shown in fig. 1, the conductive ring 100 includes a body 160, a plurality of protruding support structures 110, and a conductive fiber bundle 130. The conductive ring 100 is configured to be coupled to an electric drive system and to a bearing of the electric drive system.

The following is a detailed description.

A body 160. The body 160 is a hollow cylinder with a first sidewall. The first side wall is a side wall of the body 160 surrounding the periphery. The body 160 is made of a metal material, such as iron, copper, or nickel alloy. The body 160 has a height/thickness of 2.5mm or more and a diameter ranging from 10mm to 300mm.

A plurality of raised support structures 110. Each protruding support structure 110 includes a connection end and a terminal end. The connecting end is integrally formed with the body 160, and the tip extends toward the axial direction of the body. With continued reference to FIG. 1, in this embodiment, the body 160 has a plurality of inwardly extending raised support structures 110. Each of the protruding support structures 110 also has at least one internal cavity (not shown). The cavity is axially perpendicular to the body, extends through the body, and forms a first opening (not shown) in the first sidewall and a second opening (not shown) in the distal end. The function of the first opening and the second opening is described further below.

The protruding support structure 110 is made of a material having a certain strength/hardness, for example, aluminum, steel, plastic, etc. The higher hardness is less likely to deform when the raised support structure 110 receives a high oil level high-speed impact during oil passing.

Channels 140 are formed between adjacent ones of the raised support structures 110. The passage 140 is also referred to as a "through-oil groove" and when the conductive ring and the bearing undergo relative rotational movement, the oil between the gaps flows through the passage 140. The channel 140 may be in the form of an opening or a through hole. Referring to fig. 1 and 3, the channel 140 is a three-sided open oil groove. Referring to fig. 1, the channel 140 may be a through hole having a circular or oval cross section (described in detail below).

A bundle of conductive fibers 130, the bundle of conductive fibers 130 being received through the lumen. Referring to fig. 1, the conductive fiber bundles 130 enter through the first opening and protrude through the second opening. When the conductive ring and the bearing undergo relative rotational movement, the conductive fiber bundle 130 contacts the bearing, and the surplus charge is eliminated via the conductive fiber bundle 130.

Fig. 2 is a cross-sectional view A-A of the conductive ring shown in fig. 1. In a preferred embodiment, the conductive ring 100 includes a plurality of protruding support structures 110, each having an interior cavity therein. Referring to fig. 1, the protruding support structure 110 is a trapezoid or a rectangle, and has an axial length of 0.5mm to 15mm. The channel 140 is defined by the inner surface of the body 160, the sides of the protruding support structure adjacent thereto, and the sides of the protruding support structure 110 and the inner surface of the body are smoothly connected.

Fig. 3 is a schematic structural view of a conductive ring according to another embodiment of the present utility model. In a preferred embodiment, the conductive ring 100 includes four protruding support structures 110, each of the protruding support structures 110 having four lumens as described above. Unlike the conductive ring shown in fig. 1, in this embodiment, each protruding support structure 110 may accommodate a plurality of conductive fiber bundles 130, and each group of conductive fiber bundles 130 is accommodated in one cavity, so as to achieve the function of conducting out excessive charges.

In this embodiment, referring to fig. 4, fig. 4 is a sectional view of A-A of the conductive ring shown in fig. 3, the channel 140 is larger, i.e. the "oil groove" is larger, and can be adapted for fast rotation, so that the conductive ring can be adapted for more types of servo motors. As the motor power and oil quantity are larger and larger, the oil passing speed between the conducting ring and the bearing is also faster and faster, and the oil pressure is increased. Excessive oil pressure can quickly pass through the channel 140 to realize large oil flow.

With continued reference to fig. 1-4, in a preferred embodiment, the top surface of the body is press molded with a plurality of first securing holes 120. Any one of the first fixing holes 120 corresponds to one of the inner cavities; the conductive fiber bundles 130 are secured to the lumen by physical crimping. In the production of the conductive ring, first, the body 160 and the protruding support structure 110 are formed; next, the conductive fiber bundle 130 is inserted therethrough; finally, the first fixing holes 120 are formed in a physical forging manner to fix the conductive fiber bundles 130 to the inner cavity of the protruding support structure 110.

The cross section of the first fixing hole 120 perpendicular to the axial direction is circular, elliptical, square or rectangular. In a preferred embodiment, the first fixing hole 120 is circular, and has a radius of 1mm to 5mm. In other embodiments, the first fixing hole 120 may also be determined according to the motor model and industrial manufacturing conditions.

Further, the top surface of the body 160 may include at least two second fixing holes 150, and the conductive ring 100 is connected to the electric driving device through the second fixing holes 150. The electric driving device drives the conductive ring and the bearing to rotate relatively through the second fixing hole 150. Like the first fixing hole 120, the second fixing hole 150 has a circular, oval, square or rectangular cross section perpendicular to the axial direction.

In summary, the conductive ring provided by the technical scheme of the utility model is provided with a plurality of protruding supporting structures, and conductive fiber bundles extend out of the inner cavity of the conductive ring; and a plurality of first fixed orifices are arranged, and the conductive fiber bundles are fixed in a physical crimping mode, so that redundant charges generated by mechanical friction of an electric drive system are timely conducted out in a grounded mode, thereby effectively reducing the electric corrosion influence of the bearing and improving the durability of the bearing. In addition, channels, also known as "oil grooves," are formed between adjacent ones of the raised support structures to assist in the more lubricated rotation of the conductive ring and bearing. According to the conductive ring, the inner ring forms a plurality of channels, and lubricating oil can only pass through the channels between the bearing and the conductive ring. Along with the motor power is bigger and bigger, the oil mass is bigger and bigger, and the speed of passing oil between conducting ring and the bearing is also faster and faster, and a large amount of quick-flowing engine oil can pass through the channel in time, reaches the effect of partial pressure, keeps oil pressure stable, has avoided current conducting ring when big oil mass passes through, and the conducting fiber bundle floats on the engine oil surface, takes place the problem of deformation even.

In one embodiment of the utility model, a conductive fiber bundle fixing sleeve is also provided. Referring to fig. 5 in combination with fig. 6 to 8, fig. 5 is a schematic structural view of a conductive fiber bundle fixing sleeve according to an embodiment of the present utility model.

The conductive fiber bundle fixing sleeve 200 includes: at least one protruding support structure comprising a connection end for detachable or integrally formed connection with an external device and a terminal end opposite to the connection end. Each of the protruding support structures further comprises at least one inner cavity extending through the conductive fiber bundle fixing sleeve and forming at least one first opening 210 at the connection end and at least one second opening 220 at the terminal end. The conductive fiber bundle fixing sleeve 200 further includes at least one first fixing hole to fix the conductive fiber bundle to the inner cavity in 230 physical crimping manner.

With continued reference to fig. 6, fig. 6 is a view of the conductive fiber bundle fixing sleeve I of the embodiment of fig. 5. In this embodiment, from the I direction, the connection end of each of the inner protruding support structures includes a row of first openings 210, and the conductive fiber bundles 210 protrude from the first openings 210.

Fig. 7 is a view of another embodiment of a wire-fiber cluster-fixing jacket I in the direction. In this embodiment, from the I-direction, the connection end of each of the inner protruding support structures includes a plurality of rows of first openings 210, for example, 2 rows as shown in the drawing, and the conductive fiber bundles 210 protrude from the first openings 210.

Fig. 8 is an O-direction view of the conductive fiber bundle fixing sleeve of fig. 5 according to an embodiment of the present disclosure. From the O-direction, the protruding support structure of the conductive fiber bundle fixing sleeve 200 has a plurality of second openings 220, and the conductive fiber bundles 230 protrude from the second openings 220 to cooperate with the bearing, so that the residual charges are grounded. Similar to the conductive ring described above, this is not repeated.

In connection with the conductive loop 100 of the present utility model, as shown in fig. 1, in a preferred embodiment, the conductive fiber bundle fixing sleeve includes a protruding support structure including 1 inner cavity. In another preferred embodiment, as shown in fig. 3, the wire-fiber cluster-fixing jacket includes a protruding support structure including 4 lumens.

In summary, the conductive fiber bundle fixing sleeve provided by the utility model comprises at least one protruding support structure, wherein the protruding support structure comprises a connecting end and a tail end, and the connecting end is used for being detachably or integrally connected with an external device, can be flexibly matched with other external devices, and is suitable for a scene of leading out redundant charges and reducing electric corrosion.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a conductive ring according to another embodiment of the present utility model. In this embodiment, the conductive ring 100 includes a body 110, protruding support structures 120, and conductive fiber bundles 130, and a channel 140 is formed between adjacent protruding support structures 120. Unlike the conductive ring shown in fig. 1 and 3, the side of the protruding support structure 120 is perpendicular to the inner ring of the body 110.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a conductive ring according to another embodiment of the present utility model. In this embodiment, the conductive ring 100 includes a body 110, a protruding support structure 120, a conductive fiber bundle 130, and a channel 140. The difference from the conductive ring shown in fig. 1 and 3 is that the channel 140 is a through hole, and the cross section of the through hole is circular or elliptical.

The technical scheme of the utility model also provides an oil-cooled motor. The motor comprises a rotating shaft, oil is used as a cooling medium, and a conductive ring is arranged between the motor shaft and the shell.

The conductive ring of the motor is provided with a plurality of protruding supporting structures, and comprises a connecting end and a tail end, wherein the connecting end is integrated with the body, and the tail end extends towards the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; forming a channel between adjacent protruding support structures; a bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening. The conductive ring structure is as before, and this is not repeated.

The extending end of the conductive fiber bundle contacts the motor rotating part, and the body of the conductive ring is fixedly connected with the motor shell.

The technical scheme of the utility model also provides a transmission. The transmission includes a shaft, gears and splines, and a conductive ring. The shaft is connected with the motor shaft through a gear or a spline; the transmission is provided with a conductive ring.

The conductive ring has a plurality of protruding support structures, including a connection end and a tip end, the connection end is formed integrally with the body, and the tip end extends toward the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; channels are formed between adjacent ones of the raised support structures. A bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening. The conductive ring structure is as before, and this is not repeated.

The extending end of the conductive fiber bundle contacts the rotating part of the speed changer, and the body of the conductive ring is fixedly connected with the shell of the speed changer.

The words "left", "right", "front", "rear", "top", "bottom", "upper", "lower", "high", "low", and the like in the description and in the claims, if present, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein. For example, when the device in the figures is inverted, features that were originally described as "above" other features may be described as "below" the other features. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationship will be explained accordingly.

In addition, for reference purposes only, the terms "first," "second," and the like may also be used herein, and are thus not intended to be limiting. For example, the terms "first," "second," and other such numerical terms referring to structures or elements do not imply a sequence or order unless clearly indicated by the context.

It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or components, and/or groups thereof.

In the present utility model, the term "providing" is used in a broad sense to cover all ways of obtaining an object, and thus "providing an object" includes, but is not limited to, "purchasing," "preparing/manufacturing," "arranging/setting," "installing/assembling," and/or "ordering" an object, etc.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. The embodiments disclosed herein may be combined in any desired manner without departing from the spirit and scope of the utility model. Those skilled in the art will also appreciate that many modifications may be made to the embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (7)

1. A conductive ring, the conductive ring comprising:

The body is a hollow cylinder and is provided with a first side wall;

A plurality of protruding support structures including a connection end and a tip end, the connection end being integral with the body, the tip end extending toward an axis of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavity extending through the body and forming a first opening in the first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

a bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening.

2. The conductive ring of claim 1, wherein the conductive ring comprises a plurality of protruding support structures, each protruding support structure having one or more lumens thereon.

3. The conductive ring of claim 1, wherein the protruding support structure is a trapezoid or a rectangle with an axial length of 0.5mm to 15mm.

4. A conductive ring as claimed in claim 3, wherein the channel is defined by the body inner surface, adjacent the sides of the protruding support structure, and the sides of the protruding support structure are connected to the body inner surface.

5. The conductive loop of claim 1 wherein the conductive fiber bundles are secured to the inner cavity by physical crimping to deform the inner cavity and pinch the conductive fiber bundles.

6. An oil-cooled motor, comprising:

the motor is provided with a rotating shaft, a conducting ring is arranged between the motor shaft and the shell,

The conductive ring has a plurality of protruding support structures, including a connection end and a tip end, the connection end is formed integrally with the body, and the tip end extends toward the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavities extending through the body and forming a first opening in a first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

A bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening;

the extending end of the conductive fiber bundle contacts the rotating part of the motor, and the body of the conductive ring is fixedly connected with the shell of the oil cooling motor.

7. A transmission, the transmission comprising:

The transmission comprises a shaft, a gear and a spline, wherein the shaft is connected with a motor shaft through the gear or the spline, and a conductive ring is arranged on the transmission;

The conductive ring has a plurality of protruding support structures, including a connection end and a tip end, the connection end is formed integrally with the body, and the tip end extends toward the axis direction of the body; each of the protruding support structures further has at least one inner cavity axially perpendicular to the body, the inner cavities extending through the body and forming a first opening in a first side wall and a second opening in the end; forming a channel between adjacent protruding support structures;

A bundle of conductive fibers received through the lumen and entering through the first opening and exiting through the second opening;

The extending end of the conductive fiber bundle contacts the rotating part of the speed changer, and the body of the conductive ring is fixedly connected with the shell of the speed changer.