Lead assembly and motor using same

Abstract

The utility model discloses a lead assembly and a motor using the same. The lead assembly comprises a terminal connecting piece, a terminal piece suitable for being fixed in the terminal connecting piece, and a plurality of leads suitable for being pressed in the terminal piece. The terminal connecting piece at least comprises a body piece and a plurality of accommodating cavities arranged in the body piece; the terminal piece comprises a main body part, and a pair of combination parts and at least one pair of puncture parts which are respectively connected with the main body part; each pair of puncturing parts comprises two puncturing plates which are distributed side by side at an interval, and the two puncturing plates form an open slot suitable for accommodating one lead; the inner wall of the containing cavity is provided with a guide groove matched with each puncturing plate. At least one anti-falling structure in concave-convex interference fit is formed between the side wall, back on to the open groove, of each puncture plate and the guide groove. Each anti-falling structure comprises a convex hook pre-arranged on the puncturing plate and a groove formed by the guide groove due to extrusion deformation of the convex hook; the convex hook comprises a press-in wall, a connecting wall and an anti-falling wall which are sequentially distributed in the direction from the groove bottom of the guide groove to the groove opening.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a lead assembly and use its motor. BACKGROUND

[0002] The insulation piercing connection technology is that the cable is vertically pressed into the flat wall part provided with a slit of the conductive terminal, the edge of the slit pierces the insulation sheath of the cable and forms the electrical connection with the conductive core wire of the cable. The slit is composed of opposite edges of a metal sheet, and the metal sheet has a certain width to ensure that it has sufficient strength and can withstand the contact pressure applied to the aforementioned edge. The insulation piercing connection technology can quickly and simply realize the connection of the cable and the conductive terminal without peeling or welding treatment of the cable, so it is widely used in the field of cable connectors.

[0003] For this, the terminal piece and the lead assembly and the motor disclosed in the announcement No. CN216648614U can avoid the problems such as easy falling off of the lead of the lead assembly during dragging the lead and poor contact, but through actual research and use, it is found that the lead assembly still has the following problems:

[0004] There is no anti-falling positioning mechanism between the terminal piece and the terminal connecting device, and the assembly between the two is not in place, which can cause the terminal to loosen in the terminal connecting device, can cause interference between the tooling and the terminal when the lead is pressed into the terminal, and can cause the terminal to be pressed and injured. Even the lead may be separated from the tooling. In addition, the piercing slot of the piercing terminal adopted by the present application is an inclined slot, and the structure has the following disadvantages: on the one hand, the lead has a tendency to separate outward, which can cause insufficient lead pull-off force and poor lead contact; on the other hand, the piercing slope from top to bottom, if the paint is pierced in the middle part, the lead may cause the internal core wire to be pierced and damaged during the process of pressing and assembling the lead from top to bottom.

[0005] Based on the above situation, in order to improve the stability of the terminal piece during use, prevent it from being separated from the terminal connecting device unexpectedly, and improve the reliability of the lead and the terminal piece, it is necessary to further optimize the lead device currently used. UTILITY MODEL CONTENTS

[0006] The first object of the utility model is to provide a lead assembly to solve the technical problem of improving the reliability of the overall structure.

[0007] The second object of the utility model is to provide a motor to solve the technical problem of improving the reliability of the lead assembly used by the motor.

[0008] The lead assembly of the utility model is realized as follows:

[0009] A lead assembly, comprising: a terminal connecting piece, a terminal piece adapted to be fixed into the terminal connecting piece, and a plurality of leads adapted to be press-fitted into the terminal piece; wherein

[0010] The terminal connecting piece comprises at least a body piece and a plurality of accommodating cavities provided in the body piece;

[0011] The terminal piece comprises a main body portion, and a pair of connecting portions and at least a pair of piercing portions connected to the main body portion respectively; each pair of the piercing portions comprises two piercing plates distributed side by side and spaced apart, and a slot adapted to accommodate a lead is formed by the two piercing plates;

[0012] Inner walls of the accommodating cavities are provided with guide grooves adapted to each piercing plate; and at least one anti-disengagement structure in the form of concave-convex interference is formed between a side wall of each piercing plate facing away from the slot and the guide groove; each anti-disengagement structure comprises a protruding hook provided on the piercing plate and a recess formed by the guide groove being deformed by the protruding hook; the protruding hook comprises a press-in wall, a linking wall and an anti-disengagement wall distributed in the direction from the groove bottom to the groove opening of the guide groove in turn.

[0013] In the optional implementation of the present application, the linking wall is a straight wall, the press-in wall is an arc wall with the center located on the piercing plate, and the anti-disengagement wall is an arc wall with the center located outside the piercing plate.

[0014] In the optional implementation of the present application, one anti-disengagement structure is formed between each piercing plate and the guide groove, and the anti-disengagement structure is formed at the root position of the guide groove close to the groove bottom wall.

[0015] In the optional implementation of the present application, the groove opening of the slot is provided with a chamfer, and a round corner transition is provided between the chamfer and the groove wall of the slot.

[0016] In the optional implementation of the present application, the inner diameter of the chamfer gradually decreases in the direction of the lead being pressed into the slot; and

[0017] The maximum inner diameter of the chamfer is smaller than the outer diameter of a single lead.

[0018] In the optional implementation of the present application, the slot comprises a pair of straight wall surfaces parallel to each other, and the slot width formed by the pair of straight wall surfaces is smaller than the outer diameter of the lead so that the pair of straight wall surfaces are adapted to be in interference fit with the inner core wire of the lead.

[0019] In the optional implementation of the present application, the pair of connecting portions are distributed side by side and spaced apart, and a gap adapted to accommodate a terminal post is formed by the pair of connecting portions.

[0020] In the optional implementation of the present application, a positioning chamfer is formed on the front end portion of each connecting portion in the direction of being pressed into the accommodating cavity.

[0021] The motor is implemented as follows:

[0022] A motor at least comprises: a motor shell and a mounting portion formed on the motor shell and adapted to the lead assembly.

[0023] The mounting portion comprises a mounting cavity adapted to the insertion of the terminal connector.

[0024] In the optional implementation of the utility model, the terminal connector further comprises a partition plate formed between every two adjacent accommodation cavities.

[0025] At least one of the partition plates is provided with a locking platform in the form of a protrusion.

[0026] In the optional implementation of the utility model, the locking platform comprises a press-in guide surface, a transition surface and an anti-disengagement locking surface which are distributed in sequence along the direction in which the terminal connector is pressed into the mounting cavity.

[0027] In the optional implementation of the utility model, the transition surface is a straight wall surface, and the press-in guide surface and the anti-disengagement locking surface are respectively inclined wall surfaces in opposite directions relative to the transition surface.

[0028] By adopting the above technical scheme, the utility model has the following beneficial effects: the lead assembly and the motor using the same can improve the firmness and reliability of the cooperation structure formed by the terminal member and the terminal connector, prevent the terminal member from being unexpectedly disengaged from the terminal connector and affect the reliability of the overall use process of the lead assembly.

[0029] In addition, the cooperation between the lead and the terminal member is achieved by setting a round transition cooperation chamfer in the slotted groove of the terminal member, which can prevent the inner core wire of the lead from being damaged when not being pressed into place and thus causing the risk of wire breakage when the inner core wire is pressed into place, thereby balancing the smoothness of the overall lead and terminal member pressing process and the reliability of the lead pressing process. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Fig. 1 is a first perspective view of the terminal member of the lead assembly of the utility model;

[0031] Figure 2 Fig. 2 is a second perspective view of the terminal member of the lead assembly of the utility model;

[0032] Figure 3 Fig. 3 is an exploded view of the lead assembly of the utility model.

[0033] Figure 4 It is the schematic view of anti-drop structure between the piercing plate of the terminal piece of the lead assembly and the guide groove of the terminal connecting piece of the utility model;

[0034] Figure 5 It is the third perspective view structure schematic view of the terminal piece of the lead assembly of the utility model;

[0035] Figure 6 It is the cooperation structure schematic view of the combination part of the terminal piece and the accommodating cavity of the terminal connecting piece of the lead assembly of the utility model;

[0036] Figure 7 It is the cooperation structure schematic view of the terminal piece and the accommodating cavity of the terminal connecting piece of the lead assembly of the utility model;

[0037] Figure 8 It is the structure schematic view of the motor of the utility model;

[0038] Figure 9 It is the I part enlarged view of Figure 8 ;

[0039] Figure 10 It is the exploded structure schematic view of the mounting part of the motor and the lead assembly of the utility model;

[0040] Figure 11 It is the first perspective view structure schematic view of the locking table of the lead assembly of the motor of the utility model;

[0041] Figure 12 It is the second perspective view structure schematic view of the locking table of the lead assembly of the motor of the utility model.

[0042] In the drawing: main body part 11, combination part 12, positioning chamfer 121, piercing plate 13, notch 14, protruding hook 15, press-in wall 151, link wall 152, anti-drop wall 153, slot 16, chamfer 161, round corner transition 162, straight wall surface 163, body piece 21, accommodating cavity 22, guide groove 23, recess 24, partition plate 25, locking table 26, press-in guide surface 261, link transition surface 262, anti-drop locking surface 263, lead 3, motor shell 4, mounting part 41, mounting cavity 411, terminal post 42. DETAILED DESCRIPTION

[0043] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawing, the utility model is further detailed.

[0044] Example 1:

[0045] Please refer to Figures 1 to 7As shown, the embodiment provides a lead assembly, comprising: a terminal connecting piece, a terminal piece adapted to be fixed into the terminal connecting piece, and a plurality of leads 3 adapted to be press-fitted into the terminal piece.

[0046] Wherein the terminal connecting piece at least comprises a body piece 21 and a plurality of accommodating cavities 22 arranged in the body piece 21; the terminal piece comprises a main body part 11, and a pair of combination parts 12 and at least a pair of piercing parts connected with the main body part 11 respectively; each pair of piercing parts comprises two piercing plates 13 arranged side by side and spaced apart, and a slot 16 adapted to accommodate a lead 3 is formed by the two piercing plates 13. From the perspective of facilitating processing, the two piercing plates 13 included in each pair of piercing parts are preferably symmetrical structures.

[0047] Here, one accommodating cavity 22 matches at least one pair of piercing parts and one lead 3, and of course one accommodating cavity 22 can also match one lead 3 and two pairs of piercing parts, and at this time the two pairs of piercing parts are spaced apart along the extension direction of the lead 3. The number of pairs of piercing parts in the embodiment is not absolutely limited.

[0048] More specifically, the extension direction of the main body part 11 is substantially parallel to the extension direction of the lead 3 adapted to be press-fitted into the terminal piece, and the slot extension direction of the slot 16 is substantially perpendicular to the extension direction of the lead 3,

[0049] Based on the above, it needs to be further explained that the inner wall of the accommodating cavity 22 is provided with a guide groove 23 matched with each piercing plate 13. The groove wall surface of the guide groove 23 is preferably a smooth surface, and the design of the smooth surface can facilitate demolding of the terminal connecting piece. Through the design of the guide groove 23, the terminal piece is accurately positioned when being pressed into the terminal connecting piece, preventing deformation of the terminal piece and plastic shell bruising caused by the pressing angle during the pressing process.

[0050] At least one anti-drop structure in a concave-convex interference fit is formed between the side wall of each piercing plate 13 facing away from the slot 16 and the guide groove 23. In theory, two anti-drop structures can be formed, and when two anti-drop structures are formed, the two anti-drop structures can be spaced apart along the insertion direction of the terminal piece inserted into the terminal connecting piece. Of course, from the perspective of simplifying the overall structure, one anti-drop structure can meet the use requirements of the embodiment, and based on this, when only one anti-drop structure is formed, the anti-drop structure corresponds to the root position of the guide groove 23 close to the groove bottom wall, and this design can reduce the difficulty of press-fitting the terminal piece into the terminal connecting piece and improve the smoothness of the press-fitting process.

[0051] It should be noted that, in the above case, when the terminal member includes two pairs or more pairs of piercing portions, the anti-disengagement structure can be formed between the two piercing plates 13 included in one pair of piercing portions and the guide groove 23, or the anti-disengagement structure can be formed between each pair of piercing plates 13 and the guide groove 23. The present embodiment is not limited in this regard.

[0052] Further, in an alternative embodiment, as shown in the accompanying drawings, each anti-disengagement structure includes a protruding hook 15 provided on the piercing plate 13 and a recess 24 formed in the guide groove 23 due to the extrusion of the protruding hook 15. It should be noted that, before the piercing plate 13 is pressed into the accommodating cavity 22, the wall surface of the guide groove 23 is smooth. During the process of pressing the piercing plate 13 into the accommodating cavity 22, when the piercing plate 13 is properly fitted with the guide groove 23, the protruding hook 15 on the piercing plate 13 will extrude the wall surface of the guide groove 23, causing the portion of the guide groove 23 fitted with the protruding hook 15 to deform and form the recess 24.

[0053] It should be further noted that, in order to deform the guide groove 23 to form the recess 24 under the long-time extrusion of the protruding hook 15, thereby forming a reliable connection between the protruding hook 15 and the recess 24, the terminal connecting member in the present embodiment can be made of hard plastic material, such as PBT, but is not limited thereto. Of course, considering the smoothness during the process of pressing the piercing plate 13 into the accommodating cavity 22, the protruding hook 15 provided on the piercing plate 13 in the present embodiment will not protrude too much, and the height of the protruding hook 15 can be about 0.2 mm.

[0054] In addition, based on the above case, it should be noted that the guide groove 23 in the present embodiment has a certain depth. During the process of pressing the piercing plate 13 into the accommodating cavity 22, the protruding hook 15 will extrude the wall surface of the guide groove 23 in the entire depth direction, but due to the fast pressing speed of the piercing plate 13, the instantaneous extrusion of the protruding hook 15 will not form a recess, and each piercing plate 13 will be elastically deformed by the design of the slot 16, thereby reducing the extrusion of the wall surface of the guide groove 23 caused by the instantaneous contact of the protruding hook 15. Only when the piercing plate 13 is properly fitted with the accommodating cavity 22, the protruding hook 15 is also properly fitted with the guide groove 23. At this time, due to the long-time extrusion of the protruding hook 15 on the wall surface of the guide groove 23, the wall surface of the guide groove 23 will deform due to the extrusion and form the recess 24. Therefore, the protruding hook 15 and the recess 24 in the present embodiment form an anti-disengagement structure through interference fit, thereby improving the firmness and reliability of the fitting structure formed by the terminal member and the terminal connecting member, preventing the terminal member from being unexpectedly disengaged from the terminal connecting member and affecting the reliability of the overall use process of the lead assembly.

[0055] Next, it is to be explained that the hook 15 includes a press-in wall 151, an abutment wall 152 and a anti-extraction wall 153 which are distributed in turn along the direction from the groove bottom to the groove opening of the guide groove 23 (here, in the process of pressing the piercing plate 13 into the accommodating cavity 22, the piercing plate 13 first contacts the groove opening of the guide groove 23).

[0056] Here, in an example of an alternative embodiment, the abutment wall 152 is a straight wall, the press-in wall 151 is a circular arc wall with its center located on the piercing plate 13, and the anti-extraction wall 153 is a circular arc wall with its center located outside the piercing plate 13. In this design, the press-in wall 151 can prevent cutting of the groove wall of the guide groove 23 when it is pressed into the guide groove 23, thereby preventing the generation of garbage debris inside the terminal connecting member. The anti-extraction wall 153 and the press-in wall 151 are circular arc walls with their centers distributed in positions opposite to each other relative to the body of the piercing plate 13. This design allows the hook 15 to form a barb in the groove 24, thereby improving the reliable connection between the terminal member and the terminal connecting member. The design of the abutment wall 152 as a straight wall increases the area of contact between the hook 15 and the non-groove part of the guide groove 23, thereby reducing the risk of deformation of the hook 15 due to extrusion of the non-groove part of the guide groove 23 after the hook 15 is pressed into the guide groove 23. In other words, this design improves the overall strength of the hook 15 to ensure that the hook 15 forms a reliable connection when it is assembled into place in the groove 24 and is not easily loosened.

[0057] Next, it is to be explained that the cooperation between the lead wire and the terminal member:

[0058] In general, the lead wire 3 as a whole forms an interference fit with the slotted groove 16, so that the groove wall of the slotted groove 16 pierces the insulating outer skin of the lead wire 3 to achieve electrical connection between the terminal member and the inner core wire of the lead wire 3. Based on this, in more detail, during the process of pressing the lead wire 3 into the slotted groove 16, both the smoothness of the pressing process and the prevention of the inner core wire of the lead wire 3 from being pierced and broken need to be considered. Therefore, the present embodiment is designed as follows:

[0059] First, a chamfer 161 is provided at the opening of the slotted groove 16; the inner diameter of the chamfer 161 gradually decreases in the direction of pressing the lead wire 3 into the slotted groove 16; and the largest inner diameter of the chamfer 161 is smaller than the outer diameter of a single lead wire 3. The design of the chamfer 161 plays a guiding and piercing role during the process of pressing the lead wire 3 into the slotted groove 16. The gradually decreasing inner diameter of the chamfer 161 in the direction of pressing the lead wire 3 makes it easier for the inner wall surface of the chamfer 161 to cut the insulating outer skin of the lead wire 3, thereby achieving reliable connection between the piercing plate 13 and the inner core layer of the lead wire 3.

[0060] Secondly, a round corner transition 162 is arranged between the chamfer 161 and the slot wall of the slot 16. If the round corner transition 162 is not arranged, but a sharp corner transition is directly formed at the position where the inner wall of the slot 16 and the chamfer 161 transition, the inner core wire of the lead 3 which has been pierced by the chamfer 161 can be cut off.

[0061] In addition, it should be further noted that the slot 16 includes a pair of parallel straight wall surfaces 163, and the slot width formed by the pair of straight wall surfaces 163 is smaller than the outer diameter of the lead 3 so that the pair of straight wall surfaces are adapted to be in interference fit with the inner core wire of the lead 3, increasing the anti-disengagement fit surface and preventing the problem of disengagement between the lead 3 and the terminal member due to the too-shallow press-in depth of the lead 3 into the slot 16; in addition, the problem of cutting off the inner core wire of the lead 3 after the lead 3 is pierced and the inner core wire continues to move downward in the slot 16 after breaking through the round corner transition 162 is also avoided.

[0062] It should be further noted that, generally, the pair of engaging portions 12 in the embodiment are distributed side by side and at intervals, and the gap 14 adapted to accommodate the terminal post 42 of the motor is formed by the pair of engaging portions 12. Specifically, when the lead assembly is assembled into a specific motor, the terminal post 42 in the motor will be inserted into the gap 14 formed by the pair of engaging portions 12 along the extension direction of the lead 3 to achieve the effect that the terminal post 42 contacts the engaging portion 12, so each engaging portion 12 is generally parallel to the extension direction of the lead 3 adapted to be press-fitted into the terminal member, facilitating the contact between the terminal post 42 and the engaging portion 12.

[0063] Here, the case where each engaging portion 12 is generally parallel to the extension direction of the lead 3 adapted to be press-fitted into the terminal member is exemplified with reference to the accompanying drawings, based on which a positioning chamfer 121 is formed on the front end portion of each engaging portion 12 along the direction in which the engaging portion 12 is press-fitted into the accommodating cavity 22. It should be noted that when the end surface of the overall engaging portion 12 that engages with the inner bottom wall of the accommodating cavity 22 is an overall flat end surface, positioning chamfers 121 are arranged at the two end corners of the end surface of the engaging portion 12 along the extension direction of the lead in which the engaging portion 12 engages with the inner bottom wall of the accommodating cavity 22; when the end surface of the overall engaging portion 12 that engages with the inner bottom wall of the accommodating cavity 22 is two flat end surfaces in high-low fit, the lower end surface will directly engage with the inner bottom wall of the accommodating cavity 22, and in this case, only the positioning chamfer 121 needs to be arranged at the end corner of the lower end surface along the extension direction of the lead away from the higher end surface.

[0064] In summary, for the lead assembly of the embodiment, the assembly process between the terminal member and the terminal connecting member, and the assembly process between the lead 3 and the terminal member not only improves the smoothness of the assembly process, but also improves the use reliability and stability of the overall lead assembly.

[0065] Embodiment 2:

[0066] Referring to Figures 1 to 12 As shown in the figure, on the basis of the lead assembly of embodiment 1, the embodiment provides a motor, at least comprising: a motor housing 4 and a mounting portion 41 formed on the motor housing 4 for adapting to the lead assembly of embodiment 1; wherein the mounting portion 41 comprises a mounting cavity 411 adapted for the insertion of the terminal connecting piece. It should be noted that the motor of the present embodiment also comprises a mature stator assembly and a rotor assembly in the prior art, and the specific structure and implementation principle thereof are not improved in the present embodiment, so the specific structure thereof is not limited in the present embodiment. The present embodiment wants to explain that the mounting portion 41 for forming a reliable connection with the terminal connecting piece is provided on the motor housing 4.

[0067] On the basis of the above structure, for the matching mode between the mounting cavity of the mounting portion and the terminal connecting piece, the present embodiment specifically designs as follows:

[0068] The terminal connecting piece further comprises a partition plate 25 formed between each adjacent two accommodation cavities 22; and at least one locking platform 26 in the form of a protrusion is provided on the partition plate 25. As for the mounting cavity 411, a locking groove matched with the locking platform 26 is provided on the inner wall of the mounting cavity 411. The cooperation of the locking platform 26 and the locking groove can improve the reliable connection between the terminal connecting piece and the mounting portion 41.

[0069] Here, in an optional implementation, the locking platform 26 adopted by the present embodiment comprises a press-in guide surface 261, a connection transition surface 262 and an anti-falling locking surface 263 distributed in sequence along the direction of the terminal connecting piece being pressed into the mounting cavity 411.

[0070] More specifically, in an optional case, the connection transition surface 262 here is a straight wall surface, and the press-in guide surface 261 and the anti-falling locking surface 263 are respectively inclined wall surfaces in opposite directions relative to the connection transition surface 262. Here, the design of the press-in guide surface 261 can reduce the damage caused by the collision between the locking platform 26 and the inner wall of the mounting cavity when the locking platform 26 is inserted into the mounting cavity.

[0071] Based on the above, it should also be noted that the design of the connection transition surface 2623 as a straight wall surface increases the contact area between the locking platform 26 and the mounting cavity 411, thereby reducing the risk of deformation of the locking platform 26 caused by the extrusion of the mounting cavity 411 to the locking platform 26. That is, under this design, the overall strength of the locking platform 26 is improved to ensure that the locking platform 26 and the mounting cavity 411 form a reliable connection when assembled in place and are not prone to loosening.

[0072] Finally, it is necessary to point out that, regarding the inclination angle of the press-in guide surface 261 and the anti-falling locking surface 263 relative to the connecting transition surface 262, theoretically, they can be the same, but in the present embodiment, considering increasing the pressure resistance of the anti-falling locking surface 263 and improving the stability of the locking platform 26 during use, the inclination angle formed by the anti-falling locking surface 263 and the connecting transition surface 262 is designed to be smaller than the inclination angle formed by the press-in guide surface 261 and the connecting transition surface 262, in this case, the length of the overall press-in guide surface 261 is also greater than that of the anti-falling locking surface, thereby enhancing the guiding effect during the assembly of the locking platform 26 and the mounting cavity 411.

[0073] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application, and it should be understood that the above are only specific embodiments of the present application and are not intended to limit the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0074] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0075] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the present application when it is usually placed, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0077] Furthermore, terms such as "horizontal," "vertical," "over," "under," and the like are used as terms of convenience to provide reference points for purposes of discussion. Such terms are used in connection with the objects illustrated, but are not intended to mean that a particular item must have a particular spatial orientation. For example, "horizontal" merely refers to a direction that is more horizontal than "vertical," and does not mean that the structure must be perfectly horizontal, but can be tilted slightly.

[0078] In the present application, unless specifically stated and limited otherwise, a first feature being "on" or "under" a second feature can include the first and second features being directly in contact, or can include the first and second features not being directly in contact, but being in contact through another feature between the first and second features. Also, the first feature being "over," "above," and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is horizontally higher than the second feature. The first feature being "under," "below," and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely means that the first feature is horizontally lower than the second feature.

Claims

1. A lead assembly characterized by, The application relates to a terminal connecting piece, a terminal piece suitable for being fixed into the terminal connecting piece, and a plurality of lead wires suitable for being press-fitted into the terminal piece, wherein the terminal connecting piece comprises at least a body piece and a plurality of accommodating cavities arranged in the body piece; the terminal piece comprises a main body part, a pair of connecting parts and at least a pair of piercing parts connected with the main body part respectively; each pair of the piercing parts comprises two piercing plates arranged side by side and spaced apart, and a slot suitable for accommodating a lead wire is formed by the two piercing plates; the inner wall of the accommodating cavity is provided with a guide groove matched with each piercing plate; at least one anti-falling structure in the form of convex-concave interference is formed between the side wall of each piercing plate facing away from the slot and the guide groove; each anti-falling structure comprises a convex hook prearranged on the piercing plate and a groove formed by the guide groove being deformed by the convex hook; the convex hook comprises a press-in wall, a connecting wall and an anti-falling wall arranged in the direction from the groove bottom to the groove opening of the guide groove in sequence. The connecting wall is a straight wall, the press-in wall is an arc wall with the center located on the piercing plate, and the anti-falling wall is an arc wall with the center located outside the piercing plate. One anti-falling structure is formed between each piercing plate and the guide groove, and the anti-falling structure is formed at the root position of the guide groove close to the groove bottom wall. The groove opening of the slot is provided with a chamfer, and a round corner transition is arranged between the chamfer and the groove wall of the slot. The inner diameter of the chamfer gradually decreases in the direction of the lead wire being pressed into the slot; and 2. The lead assembly of claim 1, wherein, The maximum inner diameter of the chamfer is smaller than the outer diameter of the single lead wire.

3. The lead assembly of claim 1 or 2, wherein, The slot comprises a pair of straight wall surfaces parallel to each other, and the slot width formed by the pair of straight wall surfaces is smaller than the outer diameter of the lead wire so that the pair of straight wall surfaces are suitable for being in interference fit with the inner core wire of the lead wire.

4. The lead assembly of claim 1 or 2, wherein, A pair of connecting parts are arranged side by side and spaced apart, and a gap suitable for accommodating a terminal post is formed by the pair of connecting parts.

5. The lead assembly of claim 4, wherein, A positioning chamfer is formed on the front end of each connecting part in the direction of the connecting part being pressed into the accommodating cavity. The application further relates to a motor shell and a mounting part formed on the motor shell and suitable for matching with the lead wire assembly.

6. The lead assembly of claim 4, wherein, The mounting part comprises a mounting cavity suitable for the terminal connecting piece being inserted.

7. The lead assembly of claim 1, wherein, The terminal connecting piece further comprises a partition plate formed between each adjacent two accommodating cavities; and 8. The lead assembly of claim 7, wherein, At least one locking table in the form of a protrusion is arranged on the partition plate.

9. An electric machine characterized by The locking table comprises a press-in guide surface, a connecting transition surface and an anti-falling locking surface arranged in sequence in the direction of the terminal connecting piece being pressed into the mounting cavity. The connecting transition surface is a straight wall surface, and the press-in guide surface and the anti-falling locking surface are inclined wall surfaces in opposite directions relative to the connecting transition surface. ​ ​ 10. The electric machine of claim 9, wherein, ​ ​ 11. The electric machine of claim 10, wherein, ​ 12. The electric machine of claim 11, wherein, ​

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