Outlet box for motor and motor comprising same

Abstract

The utility model provides an outlet box used for a motor, comprising a socket having a plug installation space formed by a top wall, a bottom wall and two side walls connecting the top wall and the bottom wall; the outer edge of the top wall, the outer edge of the bottom wall and the outer edges of the two side walls form an opening for receiving a plug; the joint part is arranged on the top wall, is adjacent to the opening and extends towards the plug installation space so as to be jointed with the buckle of the plug after the plug is inserted into the plug installation space. The utility model also provides a motor comprising the outlet box. According to the utility model, a demoulding hole in a conventional outlet box is eliminated, so that the sealing performance of the outlet box is improved, the pull-out force of the plug is improved, and the external force is prevented from being concentrated on the plug buckle, so that the plug buckle structure is damaged and the plug is prevented from loosening. In addition, the protectiveness of the outlet box is effectively improved, the exposure of the internal structure of the outlet box is reduced, the plug is not easily influenced by the outside, the joint part structure is not exposed, and the aging speed of the joint part structure is greatly slowed down.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of outlet box for motor, and further relate to a kind of motor comprising the outlet box. BACKGROUND

[0002] The stator assembly of motor (for example, stepper motor) is generally provided with outlet box to connect plug with stator assembly terminal. Outlet box is usually molded part, and generally hole 90 (as shown in Figure 9 The hole can also be used to engage with the buckle of plug, so that plug can be relatively firmly kept in place after being inserted into outlet box.

[0003] Since the purpose of the hole of outlet box is to facilitate the engagement with the buckle of plug, the position of hole must strictly correspond with the position of the buckle of plug, otherwise the buckle of plug cannot be correctly engaged in hole, and this precision requirement also increases the manufacturing cost of outlet box. However, the hole in the outer wall of outlet box will make the sealing of outlet box itself worse. Moreover, this structure design will lead to the decrease of the strength of plug buckle after long time use, thereby affecting the locking force of plug buckle.

[0004] Therefore, there is a need for an outlet box to overcome at least one of the above problems. SUMMARY

[0005] In view of the above problems and needs, the present disclosure proposes a novel technical solution, which solves the above problems and brings other technical effects due to the following technical features.

[0006] The utility model provides a kind of outlet box for motor, comprising: socket, it has the plug mounting space formed by the top wall away from the stator assembly of motor, the bottom wall close to the stator assembly of motor and the two side walls connecting the top wall and the bottom wall, the outer edge of the top wall, the outer edge of the bottom wall and the outer edge of the two side walls form the opening for receiving plug;Engaging portion is set on the top wall, adjacent to the opening and extends towards plug mounting space, to engage with the buckle of plug after plug is inserted into the plug mounting space.

[0007] Preferably, the outlet box is integrally injection molded, and the top wall, the bottom wall and the two side walls do not have holes communicating into the plug mounting space.

[0008] Preferably, the engaging portion is arranged to extend along the length direction and the height direction of the opening.

[0009] Preferably, the ratio of the length of the joint portion to the length of the opening is 0.5-0.7, and / or the ratio of the maximum height of the joint portion to the height of the opening is 0.1-0.2.

[0010] Preferably, the joint portion has a ramp surface inclined with respect to the depth direction of the plug mounting space and extending toward the inner side of the opening, and the inclination angle of the ramp surface is ≤45°.

[0011] Preferably, the joint portion further comprises:

[0012] an outer side surface facing away from the plug mounting space and extending in the height direction of the opening;

[0013] a flat surface extending from the lower edge of the outer side surface parallel to the depth direction of the plug mounting space;

[0014] an inner side surface facing toward the plug mounting space and extending in the height direction of the opening;

[0015] wherein the ramp surface is connected between the flat surface and the inner side surface.

[0016] Preferably, the width of the flat surface in the depth direction of the plug mounting space is less than or equal to half of the width of the joint portion in the depth direction of the plug mounting space.

[0017] Preferably, the top wall further has two protrusions connected to both ends of the joint portion in the length direction of the opening and extending toward the plug mounting space.

[0018] Preferably, each protrusion forms a guide groove with the adjacent side wall.

[0019] Preferably, the outlet box further has a stator assembly mounting space at the side of the bottom wall away from the plug mounting space, and the plug mounting space and the stator assembly mounting space are communicated through a communication space.

[0020] Preferably, the socket has a rear wall opposite the opening, the communication space has a communication space top wall connected to the rear wall, and the communication space top wall has a terminal guide boss protruding toward the stator assembly mounting space.

[0021] Preferably, the terminal guide boss has an inclined surface inclined toward the opening and with respect to the top wall, so that the inclined surface is obtuse with respect to the top wall.

[0022] Preferably, the communication space top wall is lower than the top wall of the socket in the height direction of the opening.

[0023] Preferably, the rear wall has an outer side surface inclined with respect to the top wall, so that the outer side surface is obtuse with respect to the top wall.

[0024] Preferably, a part of the outer surface of the top wall is concave toward the plug mounting space in the opening height direction.

[0025] Preferably, the joint extends from the outer edge of the top wall toward the bottom wall, or the joint extends from a distance D from the outer edge of the top wall toward the bottom wall, the distance S being 0.5-2 times the width of the joint in the plug mounting space depth direction.

[0026] The utility model also provides a motor, including the outlet box for motor as mentioned in the preceding.

[0027] According to the design of the utility model, the demolding hole in the conventional outlet box is cancelled, thereby improving the sealing property of the outlet box, reducing the risk that water vapor, dust and the like enter the inside of the motor through the hole of the outlet box. Moreover, cancelling the demolding hole of the outlet box can effectively improve the plug pull-out force, prevent the plug buckle structure from being damaged and causing the plug to loosen due to excessive pull-out force and external force being concentrated on the plug buckle, and therefore also equivalently improve the tensile strength of the plug buckle. In addition, cancelling the demolding hole of the outlet box can effectively improve the protective property of the outlet box, reduce the exposure of the internal structure of the outlet box, make the plug not easy to be affected by the outside, and the joint structure is not exposed, greatly slowing down the aging speed of the joint structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is an exploded view of a typical stepper motor;

[0029] Figure 2 and Figure 3 is a perspective view of the outlet box according to the preferred embodiment of the utility model;

[0030] Figure 4 is a front view of the outlet box according to the preferred embodiment of the utility model;

[0031] Figure 5 is a sectional view of the outlet box according to the preferred embodiment of the utility model;

[0032] Figure 6 and Figure 7 is a schematic view of the plug being inserted into the outlet box, wherein the buckle of the plug is in the state of being engaged with the joint;

[0033] Figure 8 shows the state that the outlet box is connected to the stator assembly of the motor and the plug is inserted into the outlet box;

[0034] Figure 9 is a schematic view of a prior art outlet box. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0036] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present disclosure can have fewer components, have other components not shown in the drawings, have different components, have differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein should have the usual meanings understood by those skilled in the art of the present disclosure. The terms "first", "second", and similar terms used in the patent application specification and claims of the present disclosure do not represent any order, number, or importance, but are only used to distinguish different components. When the number of components is not specified, the number of components can be one or more; similarly, the terms "one", "the", "said", and similar terms do not necessarily represent a quantity limitation. The terms "comprise", "include", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "mount", "set", "connect", or "connected" and similar terms are not limited to physical or mechanical mounting, setting, or connecting, but can include electrical mounting, setting, or connecting, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like only represent the relative positional relationship of the device in use or the positional relationship shown in the drawings, and when the absolute position of the described object changes, the relative positional relationship can also change accordingly.

[0038] Referring to Figure 1 which shows an exploded view of a typical stepper motor, the stator assembly of which is connected to the plug through the outlet box.

[0039] Figure 2 and 3A perspective view of a terminal box for a motor according to a preferred embodiment of the present invention is shown. The terminal box 1 includes: a socket 10 having a plug mounting space 20 formed by a top wall 11 away from the stator assembly, a bottom wall 12 near the stator assembly, and two side walls 13 connecting the top wall 11 and the bottom wall 12; the outer edges of the top wall 11, the bottom wall 12, and the side walls 13 forming openings for receiving a plug 5; and a connecting portion 14 disposed on the top wall 11, adjacent to the openings, and extending toward the plug mounting space 20, to engage with a snap-fit ​​50 of the plug 5 after the plug 5 is inserted into the plug mounting space 20, thereby preventing the plug 5 from accidentally falling out. It should be understood that the snap-fit ​​50 of the plug 5 may be a snap-fit ​​that is itself elastic or a snap-fit ​​pressed by an elastic member, which can spring back to the position engaged with the connecting portion 14 after the plug 5 is inserted into the socket 10.

[0040] Figure 6 and Figure 7 The diagram shows the plug 5 inserted into the outlet box 1, with the plug 5's latch 50 engaged with the engagement part 14. Figure 8 The diagram further illustrates the state in which the outlet box 1 is connected to the stator assembly 7 of the motor and the plug 5 is inserted into the outlet box 1, wherein the plug 5 is also electrically connected to the terminal 6 of the stator assembly after being inserted into the outlet box 1.

[0041] According to the design of this utility model, the demolding hole in the conventional cable outlet box is eliminated (e.g., Figure 9 The hole 90 shown improves the sealing of the outlet box, reducing the risk of moisture and dust entering the motor through the hole. Furthermore, eliminating the outlet box's release hole effectively increases the plug's pull-out force, preventing damage to the plug clip structure and plug loosening due to excessive pull force and concentrated external force. This also effectively increases the tensile strength of the plug clip. In addition, eliminating the outlet box's release hole effectively improves its protection, reducing the exposure of the internal structure and making the plug less susceptible to external influences. The absence of exposed joint structures also significantly slows down the aging process of the joint structure.

[0042] Preferably, the outlet box 1 is integrally injection molded, meaning that the joint 14 is integrally formed with the top wall 11, bottom wall 12, side walls 13, and other structures described below, and the top wall 11, bottom wall 12, and side walls 13 do not have holes communicating with the plug mounting space 20. This not only simplifies the manufacturing process of the outlet box but also improves the overall strength of the outlet box (including the joint).

[0043] Preferably, the joint 14 is configured to extend along the opening length direction L and the opening height direction H, see [reference needed]. Figure 4The joint 14 can be designed to have a longer length, and the longer length also increases the tensile strength of the joint. At the same time, the design of the utility model eliminates the requirement that the plug buckle and the demolding hole are accurately corresponding in the prior art, so that the plug buckle can be in a larger range with the joint having a longer length, and the adaptability of the outlet box is enhanced.

[0044] Further preferably, by comprehensively considering the joint strength and the plug mounting size requirements, the ratio of the length of the joint 14 to the length of the opening can be 0.5-0.7. It is also preferable that the ratio of the maximum height of the joint 14 to the height of the opening is 0.1-0.2. For example, for an outlet box of a typical stepper motor, the opening length can be 10.85mm, the joint length can be 6.4mm; the opening height is 5.3mm, and the joint height is 0.8mm.

[0045] In order to facilitate the buckle of the plug to smoothly enter the position of engagement with the joint, the utility model provides that the joint 14 preferably has a slope surface 140 extending towards the inner side of the opening relative to the plug mounting space depth direction D, and the inclination angle of the slope surface 140 is ≤45°, see Figure 5 By setting such a slope surface, the plug can be more smoothly slid into the opening during plug mounting, and the slope surface can play a role of giving way and guiding the plug buckle, preventing the plug buckle from being unable to rebound to the position of engagement with the joint due to the plug not being inserted in place, and further avoiding the problem of insufficient pull-off force caused by the plug buckle not cooperating with the joint.

[0046] Further preferably, the joint 14 can further include: an outer side surface 141 facing away from the plug mounting space 20 and extending along the opening height direction H; a flat surface 142 extending from the lower edge of the outer side surface 141 parallel to the plug mounting space depth direction D; and an inner side surface 143 facing the plug mounting space 20 and extending along the opening height direction H. Further, the slope surface 140 is connected between the flat surface 142 and the inner side surface 143. Due to this structure, the height of the outer side surface 141 is the maximum height of the joint described above.

[0047] In the case of ensuring the maximum height of the joint, the utility model further optimizes the position of the slope surface 140. Specifically, the width of the flat surface 142 along the plug mounting space depth direction D is less than or equal to half the width of the joint 14 along the plug mounting space depth direction D. That is, the starting position of the slope surface 14 can be as close to the opening as possible.

[0048] In addition, in order to ensure that the slope surface is sufficiently flat, the slope surface can be as small as possible (and needs to be less than or equal to 45°), the slope surface can be as long as possible, and a flat surface with a sufficient size can be reserved as a starting surface of the slope surface, so as to reduce damage caused by sharp corners and prevent the overall structure of the joint from changing due to damage, thereby causing the pull-out strength of the joint to change. Therefore, by designing a flat surface as a starting surface and then connecting a transition slope surface, the structure strength of the joint can be ensured while the plug is easily guided to slide into place by the joint, and demolding is facilitated.

[0049] In addition, the utility model also proposes another optimization measure for the strength of the joint. Specifically, the top wall 11 can also have two ribs 16 connected to both ends of the joint 14 along the length direction L of the opening and extending towards the plug mounting space 20, as shown in Figure 4 Therefore, by connecting the joint to the two ribs on both sides, when the joint is pulled by external force, the stress of the joint can be dispersed on the top wall and the two ribs of the socket, and the stress on the plug buckle is also relatively reduced. Therefore, compared with the prior art in which stress is almost entirely concentrated on the plug buckle due to the opening in the outer wall, the socket structure design of the utility model greatly enhances the tensile strength and service life of the plug buckle.

[0050] In addition, since the outer side surface 141 and the inner side surface 143 have a vertical structure, the excess mold operation caused by the angle of the joint can be reduced, the mold can be easily demolded during the downward pressing action, and the demolding difficulty is reduced.

[0051] Further preferably, a guide groove 17 is formed between each rib 16 and the adjacent side wall 13, so that the plug can include a corresponding guide limiting structure (not shown) that can be inserted into the guide groove 17, thereby limiting the displacement of the plug in the up-down direction and the left-right direction, preventing inaccurate positioning of the plug, and further preventing damage to the motor terminal caused by positional deviation.

[0052] In addition, the outlet box 1 also has a stator assembly mounting space 30 at the side of the bottom wall 12 away from the plug mounting space 20, as shown in Figure 2 、 4 、5. The plug mounting space 20 and the stator assembly mounting space 30 are communicated through a communication space 40.

[0053] Preferably, as shown in Figure 5 , the socket 10 has a rear wall 18 opposite the opening. The rear wall 18 is connected to the top wall 11, the bottom wall 12 and the two side walls 13. The communication space 40 has a communication space top wall 41 connected to the rear wall 18, and the communication space top wall 41 has a terminal guide boss 42 protruding towards the stator assembly mounting space 30.

[0054] Further preferably, the terminal guide boss 42 has a slope 43 inclined towards the opening and relative to the top wall 11, so that the slope 43 forms an obtuse angle relative to the top wall 11. This design can further facilitate the demoulding of the outlet box.

[0055] Preferably, the top wall 41 of the communication space is lower than the top wall 11 of the socket 10 in the opening height direction H, so as to reduce the overall size of the outlet box and facilitate the miniaturization of the motor.

[0056] Further preferably, the rear wall 18 has an outer side 19 inclined relative to the top wall 11, so that the outer side 19 forms an obtuse angle relative to the top wall 11, thereby further facilitating the demoulding of the outlet box.

[0057] It is also preferable that a portion of the outer surface 111 of the top wall 11 is concave towards the plug mounting space 20 in the opening height direction H, as shown in Figure 3 、 4 This design makes the top of the outlet box sink, which not only reduces the material consumption of the outlet box, but also reduces the internal stress caused by material shrinkage during the cooling of the thick wall during the injection molding of the outlet box.

[0058] In addition, in the preferred embodiment as shown, the joint 14 can extend from the outer edge of the top wall 11 towards the bottom wall 12, that is, the joint 14 can be directly provided at the opening. According to a preferred embodiment not shown, the joint 14 can extend from a distance S from the outer edge of the top wall 11 towards the bottom wall 12, that is, the joint 14 can be arranged at a position inside the opening. The distance S may, for example, be 0.5-2 times the width of the joint 14 in the plug mounting space depth direction D.

[0059] The utility model also provides a motor, especially a stepping motor, which comprises the outlet box as described above.

[0060] The exemplary embodiments of the present disclosure are described in detail above with reference to the preferred embodiments, however, those skilled in the art can understand that various modifications and improvements can be made to the above specific embodiments without departing from the concept of the present disclosure, and various technical features and structures proposed by the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. A terminal box (1) for an electric machine, characterized in that The socket (10) has a plug mounting space (20) formed by a top wall (11) distal from a stator assembly of a motor, a bottom wall (12) proximal to the stator assembly of the motor, and two side walls (13) connecting the top wall (11) and the bottom wall (12), an outer edge of the top wall (11), an outer edge of the bottom wall (12), and outer edges of the two side walls (13) forming an opening for receiving a plug; The engaging portion (14) is provided on the top wall (11), adjacent to the opening and extending towards the plug mounting space (20), to engage with a catch (50) of the plug (5) after the plug (5) is inserted into the plug mounting space (20). The outlet box (1) is integrally injection molded, and the top wall (11), the bottom wall (12), and the two side walls (13) do not have holes communicating into the plug mounting space (20).

2. Outlet box (1) for an electric machine according to claim 1, characterized in that, The engaging portion (14) is provided to extend along the length direction (L) and the height direction (H) of the opening.

3. Outlet box (1) for an electric machine according to claim 1, characterised in that, The ratio of the length of the engaging portion (14) to the length of the opening is 0.5-0.7, and / or the ratio of the maximum height of the engaging portion (14) to the height of the opening is 0.1-0.

2.

4. Outlet box (1) for an electric machine according to claim 3, characterized in that, The engaging portion (14) has a slope surface (140) inclined with respect to the depth direction (D) of the plug mounting space and extending towards the inner side of the opening, and the inclination angle of the slope surface (140) is ≤45°.

5. The outlet box (1) for an electric motor according to claim 3, characterized in that, The engaging portion (14) further comprises:

6. Outlet box (1) for an electric machine according to claim 5, characterized in that, an outer side surface (141) facing away from the plug mounting space (20) and extending along the height direction (H) of the opening; a flat surface (142) extending from the lower edge of the outer side surface (141) parallel to the depth direction (D) of the plug mounting space; an inner side surface (143) facing the plug mounting space (20) and extending along the height direction (H) of the opening; wherein the slope surface (140) is connected between the flat surface (142) and the inner side surface (143). The width of the flat surface (142) along the depth direction (D) of the plug mounting space is less than or equal to half of the width of the engaging portion (14) along the depth direction (D) of the plug mounting space.

7. Outlet box (1) for an electric machine according to claim 6, characterized in that, The top wall (11) further has two protrusions (16) connected to both ends of the engaging portion (14) along the length direction (L) of the opening and extending towards the plug mounting space (20).

8. A terminal box (1) for an electric machine according to claim 4, characterised in that, Each protrusion (16) forms a guide groove (17) with the adjacent side wall (13).

9. Outlet box (1) for an electric machine according to claim 8, characterized in that, The outlet box (1) further has a stator assembly mounting space (30) at a side of the bottom wall (12) distal from the plug mounting space (20), and the plug mounting space (20) and the stator assembly mounting space (30) are communicated through a communication space (40).

10. The outlet box (1) for an electric motor according to claim 1, characterized in that, The socket (10) has a rear wall (18) opposite to the opening, the communication space (40) has a communication space top wall (41) connected to the rear wall (18), and the communication space top wall (41) has a terminal guide boss (42) protruding towards the stator assembly mounting space (30).

11. Outlet box (1) for an electric machine according to claim 10, characterized in that, ​ 12. Outlet box (1) for an electric machine according to claim 11, characterized in that, The terminal guide boss (42) has a slope (43) inclined toward the opening and relative to the top wall (11), such that the slope (43) is obtuse relative to the top wall (11).

13. The outlet box (1) for an electric motor according to claim 11, characterized in that, The top wall (41) of the communication space is lower than the top wall (11) of the socket (10) in the opening height direction (H).

14. A terminal box (1) for an electric machine according to claim 13, characterised in that, The rear wall (18) has an outer side (19) inclined relative to the top wall (11), such that the outer side (19) is obtuse relative to the top wall (11).

15. The outlet box (1) for an electric motor according to claim 1, characterized in that, A portion of the outer surface (111) of the top wall (11) is concave toward the plug mounting space (20) in the opening height direction (H).

16. A terminal box (1) for an electric machine according to claim 1, characterised in that, The joint (14) extends from the outer edge of the top wall (11) toward the bottom wall (12); or the joint (14) extends from a distance D from the outer edge of the top wall (11) toward the bottom wall (12), the distance S being 0.5-2 times the width of the joint (14) in the plug mounting space depth direction (D).

17. An electric machine characterized by A terminal box (1) for an electric machine as claimed in any one of claims 1-16.

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