Locking device with anti-backup function

Abstract

The application provides a locking device with anti-backoff function, characterized by comprising a screw rod, a screw head and a nut; the screw rod is provided with a first thread and a boss, and a spring is sleeved on the boss; one end of the screw head is provided with a groove, the boss can rotate synchronously in the tangential direction and move axially relative to the screw head, the screw head is further provided with an outer anti-backoff tooth and a screwing part, the outer anti-backoff tooth is arranged on the outer side surface of the screw head, and the screwing part is arranged on the end of the screw head away from the groove; the nut is provided with a through hole, the inner wall of the through hole is provided with an inner anti-backoff tooth and a second thread, the inner anti-backoff tooth is engaged with the outer anti-backoff tooth to limit the rotation of the screw head relative to the nut, and the second thread is arranged on the side of the inner wall of the through hole away from the inner anti-backoff tooth; the locking device provided by the application can make the outer anti-backoff tooth and the inner anti-backoff tooth engage by extruding the screw rod and the screw head through the spring, so that the anti-backoff of the screw rod is realized; the screw head can also make the outer anti-backoff tooth and the inner anti-backoff tooth disengage, so that the locking is realized, and the operation is simple and convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of connectors, in particular to a locking device with anti-backout function. BACKGROUND

[0002] At present, the power supply mode of electric vehicle power battery generally includes two modes of charging with the vehicle and replacing the battery, wherein the charging mode includes two modes of slow charging and fast charging. The charging mode has the following defects: 1. The initial investment cost of the battery is large, which hinders the popularization of electric vehicles to some extent; 2. The charging time is too long, at least 2-4 hours, compared with the refueling of ordinary vehicles, the time spent by electric vehicles to supply energy is too long, which is very inconvenient and far from meeting people's needs. The fast charging mode will cause great damage to the battery, which will shorten the service life of the battery. The mode of replacing the battery can effectively avoid the problems existing in the charging mode, and various battery box and battery frame structures have appeared in recent years.

[0003] The key to the rapid replacement of electric vehicle power battery is the design of the replacement locking mechanism. When replacing the battery, the vehicle body and the battery pack should be quickly connected and separated; when not replacing the battery, the vehicle body and the battery pack should be kept in a firm connection state. When the vehicle is in operation, the vehicle body will inevitably vibrate, and the locking mechanism may be loose or even fall off from the installation place due to the influence of vibration, which will reduce the firmness of the battery pack installation.

[0004] A rapid bolt replacement device in the prior art includes a structure of a large ball and a small ball cooperating with each other. By pushing the large ball upward, the large ball extrudes the small ball out of the locking hole of the lock body shell, so that part of the small ball extruded out of the locking hole is used to position and lock the device externally sleeved on the lock body shell. However, such a structure has the problems of stress concentration at the contact point of the large ball and the small ball, residual deformation of the small ball during locking, many indentations on the surface of the ball, and influence on the smoothness of the lock body, which may cause failure in locking and unlocking. Moreover, the lock body on the battery pack side of the rapid bolt replacement device has a complex cooperation structure with the battery pack, has too many machined surfaces, requires high machining precision, and has high cost.

[0005] Therefore, the present application aims to provide a locking device with anti-backout function, which can be conveniently installed and removed, and has anti-backout function after installation. SUMMARY

[0006] In view of the above problems of the prior art, the present application aims to provide a locking device with anti-backout function, comprising a screw rod, a screw head and a nut; the rod part of the screw rod is provided with a first thread, and the end part of the screw rod is provided with a boss, and a spring is sleeved on the boss; one end of the screw head is provided with a groove matched with the boss, the boss can move along the direction in which the groove is opened, and the boss and the groove can limit the rotation of the screw rod relative to the screw head, the screw head is further provided with an outer anti-backout tooth and a screwing part, the outer anti-backout tooth is arranged on the outer side surface of the screw head, and the screwing part is arranged at one end of the screw head away from the groove; the nut is provided with a through hole, and the inner wall of the through hole is provided with an inner anti-backout tooth and a second thread, the inner anti-backout tooth is engaged with the outer anti-backout tooth to limit the rotation of the screw head relative to the nut, and the second thread is arranged on one side of the inner wall of the through hole away from the inner anti-backout tooth.

[0007] Further, the rod part of the screw rod is provided with a circular table, the first thread is arranged on the side surface of the circular table, the diameter of the spring is smaller than the diameter of the circular table, and the circular table has a blocking surface for limiting the spring.

[0008] Specifically, a guide part is further arranged between the outer anti-backout tooth and the screwing part, and the guide part plays a guiding role when the screw head is assembled into the nut.

[0009] Further, the locking device further comprises a sleeve, the sleeve is provided with a stepped inner cavity penetrating through the sleeve, the stepped inner cavity comprises a first inner cavity and a second inner cavity, the first inner cavity and the second inner cavity are integrated, the diameter of the second inner cavity is larger than that of the first inner cavity, and the second inner cavity is used for accommodating the nut.

[0010] Specifically, the nut is provided with an outer hexagonal structure, and one end of the nut away from the outer hexagonal structure is provided with a flange.

[0011] Preferably, the second inner cavity is matched with the flange.

[0012] Further, the locking device further comprises a connecting mechanism, the connecting mechanism is used for mounting the locking device, the connecting mechanism is provided with a cavity for accommodating the screw rod, and the inner wall of the cavity is provided with a third thread matched with the first thread.

[0013] Preferably, at least part of the connecting mechanism is arranged in the stepped inner cavity, the outer wall is provided with a fourth thread matched with the second thread.

[0014] Preferably, the connecting mechanism is further provided with a flange surface, and the flange surface is matched with the nut to lock the sleeve.

[0015] Further, the unlocking device further comprises a limiting structure, one end of the connecting mechanism is provided with a hole matched with the limiting structure, and the limiting structure is arranged in the hole to limit the stroke of the screw rod.

[0016] Thanks to the above technical scheme, the present application has the following beneficial effects:

[0017] 1) The unlocking device with the anti-backoff function can realize the synchronous tangential rotation and axial relative movement of the bolt head and the screw rod through the cooperation of the boss and the groove.

[0018] 2) The mechanical anti-backoff function of the screw rod can be realized through the meshing of the outer anti-backoff teeth of the bolt head and the inner anti-backoff teeth of the nut, avoiding the loosening of the bolt caused by vehicle vibration.

[0019] 3) The outer anti-backoff teeth and the inner anti-backoff teeth are meshed through the spring elastic force, so as to realize the anti-backoff of the screw rod; the bolt head is jacked up to press the spring, and the outer anti-backoff teeth and the inner anti-backoff teeth are disengaged, so as to realize unlocking, which is simple and convenient to operate.

[0020] 4) The flange is arranged on the connecting mechanism to lock the sleeve in cooperation with the bolt head, so as to realize the stable installation of the locking device. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0022] Figure 1 is a structural schematic view of the unlocking device with the anti-backoff function provided by the embodiment of the present application;

[0023] Figure 2 is a structural schematic view of the sleeve;

[0024] Figure 3 is a structural schematic view of the unlocking device when locked;

[0025] Figure 4 is a structural schematic view of the unlocking device when unlocked.

[0026] In the figure: 10-screw, 11-first thread, 12-boss, 20-spring, 30-bolt head, 31-groove, 32-outer anti-back tooth, 33-guide part, 34-twist part, 40-nut, 41-second thread, 42-internal anti-back tooth, 43-outer hexagonal structure, 44-flange, 50-sleeve, 51-first inner cavity, 52-second inner cavity, 60-connecting mechanism, 61-third thread, 62-fourth thread, 63-flange surface, 64-aperture, 70-limiting structure. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. "Inner", "outer", and the like are only used for the convenience of describing the relative positional relationship between the components, which of course also includes the relative positional relationship defined in the same way when different reference directions are used.

[0029] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] Embodiment 1

[0031] Please refer to Figures 1 to 4 The locking device with anti-back function provided in the embodiment comprises a screw 10, a bolt head 30 and a nut 40.

[0032] The rod part of the screw 10 comprises a cylindrical circular truncated cone and a boss 12, the circular truncated cone and the boss 12 are connected, the side surface of the circular truncated cone is provided with a first thread 11, in the embodiment of the present application, the boss 12 is a square prism whose cross section perpendicular to its radial direction, and a spring 20 is sleeved on the boss 12;

[0033] The inner diameter of the spring 20 is greater than the length of the diagonal of the cross section of the boss 12 and less than the diameter of the circular truncated cone, the circular truncated cone has a blocking surface for limiting the upward stroke of the spring 20;

[0034] One end of the bolt head 30 is provided with a groove 31 matched with the boss 12, the boss 12 is at least partially arranged in the groove 31, and the boss 12 can move along the direction in which the groove 31 is opened, so that the spring 20 is located between the blocking surface and the bolt head. In the embodiment of the present application, the groove 31 is a cylindrical groove with a positive cross section, and the boss 12 cooperates with the groove 31 to limit the radial rotation of the screw rod 10 relative to the bolt head 30, that is, when the bolt head 30 is screwed, the screw rod 10 will be inevitably rotated synchronously;

[0035] It should be noted that the opening depth of the groove 31 is greater than the range in which the boss 12 can float up and down, and the boss 12 can have other shapes in addition to the shape in the embodiment of the present application, for example, the boss is a prism with other polygonal cross sections and a prism with a special-shaped cross section, etc. Correspondingly, the cross section of the groove matches the cross section of the boss, so that the boss can smoothly slide in the groove without relative rotation;

[0036] The bolt head 30 is also provided with an outer anti-back tooth 32 and a screwing part 34. The outer anti-back tooth 32 is arranged on the outer side of the bolt head 30, and the outer anti-back tooth 32 is arranged on the side of the bolt head 30 close to the groove 31. The screwing part 34 is arranged at one end of the bolt head 30 away from the groove 31, and the screwing of the bolt head 30 is realized by screwing the screwing part 34. Preferably, the screwing part 34 can have the shape of an outer hexagonal prism, so as to be matched with general screwing instruments.

[0037] The nut 40 is provided with a through hole, and the inner wall of the through hole is provided with an inner anti-back tooth 42 and a second thread 41. The inner anti-back tooth 42 is engaged with the outer anti-back tooth 32 for limiting the rotation of the bolt head 30 relative to the nut 40, and the second thread 41 is arranged on the side of the inner wall of the through hole away from the inner anti-back tooth 42.

[0038] A guide portion 33 is further provided between the outer anti-backoff teeth 32 and the screwing portion 34. That is, the outer portion of the bolt head 30 is provided with the outer anti-backoff teeth 32, the guide portion 33, and the screwing portion 34 in sequence, and the diameter of the guide portion 33 is smaller than the diameter of the outer anti-backoff teeth 32 and larger than the diameter of the screwing portion 34. Since the outer anti-backoff teeth 32 are adapted to the inner anti-backoff teeth 42, the size of the guide portion 33 is smaller than the through hole and smaller than the size of the inner anti-backoff teeth 42. When the bolt head 30 is assembled into the nut 40, the guide portion 33 and the screwing portion 34 can partially extend out of the through hole of the nut 40. The guide portion 33 is used to guide the bolt head 30 when it is assembled into the nut 40, so that the straight direction of the bolt head 30 overlaps with the straight direction of the nut 40, so that the outer anti-backoff teeth 32 and the inner anti-backoff teeth 42 fully cooperate.

[0039] When assembling an unlocking device with an anti-backoff function described in an embodiment of this specification, the spring 20 is first sleeved on the boss 12, and the screw 10 is assembled into the groove 31, so that the spring 20 is located between the screw 10 and the bolt head 30; then the assembly of the screw 10 and the bolt head 30 is assembled into the nut 40, and the screw 10 can be connected and fixed with other connecting parts through the first thread 11. Under the elastic force of the spring 20, the bolt head 30 is squeezed so that the outer anti-backoff teeth 32 and the inner anti-backoff teeth 42 of the nut are engaged, as shown in FIG. Figure 3 As shown at A in the middle, since the screw rod 10 cannot rotate circumferentially relative to the bolt head 30, the locking and mechanical anti-retraction functions of the screw rod 10 are achieved.

[0040] When disassembling the locking device provided in the embodiment of the present specification, a force greater than the elastic force of the spring 20 needs to be applied to the bolt head 30 to lift the bolt head 30, thereby releasing the engagement state of the outer anti-backoff tooth 32 and the inner anti-backoff tooth 42. Figure 4 As shown in A in the middle.

[0041] Preferably, the length of the guide portion 33 is greater than the depth of the bolt head 30 floating up and down, so that when the bolt head 30 is lifted to unlock, Figure 4 As shown, the guide portion 33 can still guide the bolt head 30; the screwing portion 34 extends out of the through hole to facilitate the use of a screwing instrument to screw the bolt head 30, and screwing the screw portion 34 causes the screw 10 to rotate synchronously, thereby realizing the disassembly of the screw 10.

[0042] The locking device provided by the embodiment of the present application further comprises a sleeve 50, wherein the sleeve 50 is provided with a stepped inner cavity penetrating through the sleeve 50, the stepped inner cavity comprises a first inner cavity 51 and a second inner cavity 52, the first inner cavity 51 and the second inner cavity 52 are integrated, the diameter of the second inner cavity 52 is greater than the diameter of the first inner cavity 51, and the second inner cavity 52 is used for accommodating the nut 40.

[0043] The nut 40 is provided with an outer hexagonal structure 43 near one end of the inner anti-back tooth 42, the outer hexagonal structure 43 is arranged on the outer side of the nut 40, and the outer hexagonal structure 43 can be screwed to realize installation and disassembly of the nut 40, and one end of the nut 40 away from the outer hexagonal structure 43 is provided with a flange 44, specifically, the second inner cavity 52 is matched with the flange 44, and the second inner cavity 52 is used for accommodating the flange 44.

[0044] The locking device provided by the embodiment of the present application further comprises a connecting mechanism 60, wherein the connecting mechanism 60 is used for installing the locking device, the connecting mechanism 60 is provided with a cavity used for accommodating the screw rod 10, the inner diameter of the cavity is matched with the outer diameter of the first screw thread 11, the third screw thread 61 is arranged on the inner wall of the cavity, the third screw thread 61 is matched with the first screw thread 11, and the screw rod 10 is installed on the connecting mechanism 60 through screw thread cooperation between the first screw thread 11 and the third screw thread 61.

[0045] At least part of the connecting mechanism 60 is arranged in the stepped inner cavity, the outer diameter of the connecting mechanism 60 is matched with the first inner cavity 51, the fourth screw thread 62 is arranged on the outer wall of the connecting mechanism 60, the diameter at the fourth screw thread 62 is matched with the through hole of the nut 40, specifically, the fourth screw thread 62 is matched with the second screw thread 41, and the nut 40 and the connecting mechanism 60 are fixedly connected through screw thread cooperation between the second screw thread 41 and the fourth screw thread 62.

[0046] The connecting mechanism 60 is further provided with a flange surface 63, the flange surface 63 is matched with the nut 40 and is used for locking the sleeve 50, the sleeve 50 can be used for connecting one of a battery pack and a battery pack mounting beam, the connecting mechanism 60 can be used for connecting the other of the battery pack and the battery pack mounting beam, under cooperation of the screw rod 10, the bolt head 30 and the nut 40, the anti-back installation of the battery pack can be realized, and the battery pack is convenient to disassemble and replace. In addition, the locking device provided by the embodiment of the present application can also be used in other scenes where the bolt needs to be mechanically prevented from back-off.

[0047] The locking device with the anti-backoff function provided by the embodiment of the present specification can realize synchronous tangential rotation and axial relative movement of the bolt head and the screw rod through cooperation of the convex boss and the groove.

[0048] The mechanical anti-backoff function of the screw rod is realized through meshing of the outer anti-backoff tooth of the bolt head and the inner anti-backoff tooth of the nut.

[0049] The screw rod and the bolt head are extruded through the spring elastic force, so that the outer anti-backoff tooth and the inner anti-backoff tooth are meshed, the anti-backoff of the screw rod is realized, the bolt head is jacked up to extrude the spring, and the outer anti-backoff tooth and the inner anti-backoff tooth are disengaged, the unlocking is realized, and the operation is simple and convenient.

[0050] Embodiment 2

[0051] Reference Figures 1 to 4 The difference between the embodiment and the embodiment 1 is that the present specification provides an unlocking device with the anti-backoff function, further comprising a limiting structure 70, one end of the connecting mechanism 60 is provided with an opening hole 64 matched with the limiting structure 70, and the limiting structure 70 is arranged in the opening hole 64 to limit the stroke of the screw rod 10. The limiting structure 70 can limit the downward stroke of the screw rod 10, prevent the spring 20 and the inner anti-backoff tooth 32 and the outer anti-backoff tooth 42 from being damaged due to excessive stroke of the screw rod 10, and avoid irreversible hard damage of the parts.

[0052] It should be noted that the limiting structure 70 can be a limiting stopper, a limiting snap spring, a limiting pin and the like, which can limit and serve as a limiting structure, and is not limited herein.

[0053] The same and similar parts between the embodiment of the present specification and the embodiment 1 can be referred to each other, and each embodiment mainly describes the difference from other embodiments. The beneficial effects obtained by the embodiment are the same as the beneficial effects obtained by the embodiment 1, and are not described herein.

[0054] The various embodiments in this specification are described in a progressive manner, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above is only a partial embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. In the absence of conflict, the above embodiments and the features in the embodiments herein can be combined with each other. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any changes made by those skilled in the art to the specific embodiments of the present invention do not depart from the scope of the claims of the present invention.

Claims

1. A locking device with an anti-retraction function, characterized in that: The screw rod (10), the bolt head (30), the nut (40) and the sleeve (50) are included. The rod part of the screw rod (10) is provided with a first thread (11), and the end part of the screw rod (10) is provided with a boss (12), and the boss (12) is sleeved with a spring (20); the screw rod (10) is provided with a circular table, the circular table is connected with the boss (12), the first thread (11) is arranged on the side of the circular table, the diameter of the spring (20) is smaller than the diameter of the circular table, and the circular table has a blocking surface for limiting the spring (20); One end of the bolt head (30) is provided with a groove (31) matched with the boss (12), the boss (12) can move along the direction in which the groove (31) is opened, and the boss (12) and the groove (31) are matched to limit the rotation of the screw rod (10) relative to the bolt head (30); the bolt head (30) is also provided with an outer anti-back tooth (32) and a screwing part (34), the outer anti-back tooth (32) is arranged on the outer side of the bolt head (30), and the screwing part (34) is arranged at one end of the bolt head (30) away from the groove (31); The nut (40) is provided with a through hole, and the inner wall of the through hole is provided with an inner anti-back tooth (42) and a second thread (41); the inner anti-back tooth (42) is engaged with the outer anti-back tooth (32) to limit the rotation of the bolt head (30) relative to the nut (40); and the second thread (41) is arranged on one side of the inner wall of the through hole away from the inner anti-back tooth (42); The sleeve (50) is provided with a stepped inner cavity penetrating through the sleeve (50), the stepped inner cavity includes a first inner cavity (51) and a second inner cavity (52), the first inner cavity (51) and the second inner cavity (52) are connected in one body, the diameter of the second inner cavity (52) is greater than that of the first inner cavity (51), and the second inner cavity (52) is used for containing the nut (40); The locking device further includes a connecting mechanism (60) for mounting the locking device, the connecting mechanism (60) is provided with a cavity for containing the screw rod (10), the inner wall of the cavity is provided with a third thread (61) matched with the first thread (11); at least part of the connecting mechanism (60) is arranged in the stepped inner cavity, and the outer wall of the connecting mechanism (60) is provided with a fourth thread (62) matched with the second thread (41).

2. The locking device with anti-backout function according to claim 1, characterized in that, The outer anti-back tooth (32) and the screwing part (34) are further provided with a guide part (33) smaller than the through hole, and the guide part (33) is used for guiding the assembly of the bolt head (30) into the nut (40).

3. The locking device with anti-backout function according to claim 1, characterized in that, The nut (40) is provided with an outer hexagonal structure (43) arranged at one end close to the second thread (41), and a flange (44) is arranged at the other end of the nut (40) away from the outer hexagonal structure (43).

4. The locking device with anti-backout function according to claim 3, characterized in that, The second inner cavity (52) is matched with the flange (44).

5. The locking device with anti-backout function according to claim 1, characterized in that, The connecting mechanism (60) is further provided with a flange surface (63) matched with the nut (40) for locking the sleeve (50).

6. The locking device with anti-backout function according to claim 1, characterized in that, Further comprising a limiting structure (70), one end of the connecting mechanism (60) is provided with an opening (64) matched with the limiting structure (70), and the limiting structure (70) is arranged in the opening (64) for limiting the stroke of the screw rod (10).

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