Coded lock for U-shaped lock

Abstract

The utility model belongs to the technical field of coded locks for U-shaped locks, solves the technical problems that coded locks for U-shaped locks in the prior art are poor in anti-theft performance and inconvenient to store, and provides a coded lock for a U-shaped lock, which comprises a box body, two through lock holes for inserting U-shaped lock rods are arranged on the side face of the box body, and the lock holes are communicated with the box body. A password wheel assembly and an unlocking button are arranged on the box body, a lock cylinder is arranged on the box body, and the lock cylinder is connected with the password wheel assembly; two locking columns corresponding to the two lock holes are symmetrically arranged in the box body, and sliding grooves stretching out and drawing back corresponding to the locking columns are formed in the box body. According to the coded lock for the U-shaped lock, the lock cylinder is arranged, so that a password can be found when the password is forgotten, and the coded lock is prevented from being abandoned.

Description

TECHNICAL FIELD

[0001] The utility model relates to U type lock technical field especially relates to a password lock for U type lock. BACKGROUND

[0002] With the acceleration of people's life rhythm, the traffic tool is also gradually developing towards simple and fast direction, for the public ordinary wage earners, the electric bicycle and the motorcycle become the typical representative, especially the electric bicycle gradually becomes the mainstream of the wage earners to select the traffic tool. But the problem of theft that follows is also slowly put on the topic, the electric bicycle of present is also more expensive than the ordinary bicycle, less one thousand yuan, more several thousand yuan, if stolen, not only the economic loss, but also the car owner's car loss is also psychologically difficult to accept. It is well known that there is a built-in lock direction handle lock on the electric bicycle and the motorcycle of present, the ordinary bicycle round pin box lock and the very mainstream U type lock, the U type lock is cylindrical lock, is more firm than general lock, is difficult to pry, and needs to be hammered for a long time. But the existing U type lock has the following defects: the password of U type lock is easy to forget, and the lock body can only be abandoned or violently disassembled in the case of forgetting the password, causing economic loss and inconvenience. CONTENT OF THE UTILITY MODEL

[0003] The utility model embodiment provides a password lock for U type lock to solve the technical problem of inconvenient use of the password lock for U type lock at night.

[0004] The utility model embodiment provides a password lock for U type lock, including the box body, two lock holes for inserting the U type lock rod are set up on the side surface of the box body, the box body is provided with the password wheel subassembly and the lock release button, the lock core is provided on the box body, the lock core is connected with the password wheel subassembly;

[0005] Two locking columns are symmetrically arranged in the box body corresponding to the two lock holes, a sliding groove corresponding to each locking column is arranged in the box body, one end of the locking column extends into the lock hole, the other end is provided with a top block, the central position of the side surface of the box body close to the locking column is provided with a lock release button, the lower end of the lock release button is provided with a pressing block, the side of the pressing block far away from the lock hole is an inclined surface, the side of the top block close to the lock hole is an inclined surface, the inclined surfaces of the pressing block and the top block abut, a first reset spring for driving the locking column to move back to the lock hole is arranged between the two locking columns, the password wheel subassembly abuts with the two locking columns;

[0006] The password wheel assembly comprises a mounting rack arranged on the inner side of the box body, the mounting rack is provided with a mounting shaft, the axis of the mounting shaft is perpendicular to the axis of the lock hole, at least four rotating wheel assemblies are rotatably arranged on the mounting shaft, an activity plate is arranged below the rotating wheel assembly, an abutting piece is arranged on the end of the activity plate close to the unlocking button, a second reset spring is arranged between the activity plate and the bottom of the box body, the edge of the activity plate is in abutting fit with the inner wall of the box body; the box body is provided with an opening for each rotating wheel assembly to expose; the rotating wheel assembly comprises a driving wheel and a password wheel, the driving wheel is provided with a rotating hole along the axis and is rotatably connected to the mounting shaft through the rotating hole, the password wheel is provided with a connecting hole along the axis and is sleeved on the driving wheel through the connecting hole; ten recesses are arranged on the side of the password wheel close to the corresponding driving wheel, the ten recesses are circumferentially distributed along the axis of the connecting hole, the ten recesses are communicated with the connecting hole, a plurality of clamping pieces are formed at equal intervals on the side of the driving wheel close to the corresponding recess, each clamping piece is nested in the corresponding recess on the password wheel, a limiting groove is formed on the inner side of the driving wheel along the axis direction, a mounting groove is formed on the side of the mounting shaft along the length direction of the mounting shaft, a baffle is arranged at one end of the mounting shaft, the baffle is in abutting fit with the mounting groove on one side, and the other end is connected with a mounting rod, two opposite planes are formed on the side of the mounting rod, a compression spring is arranged at the end of the mounting groove close to the baffle, a limiting rod is slidably arranged in the mounting groove, at least four limiting blocks are arranged on the limiting rod corresponding to the limiting groove, the driving wheel passes through the mounting rod and the limiting rod, the limiting groove of the driving wheel is limited by the limiting blocks after passing through the limiting blocks, one end of the limiting rod is in abutting fit with the compression spring, and the other end extends to the lock core.

[0007] The working principle and process are as follows:

[0008] In use, the rotating wheel assembly is adjusted so that the unlocking button is not affected by the rotating wheel assembly, the unlocking button is pressed downward, the two locking posts are retracted inward, thereby facilitating the unlocking rod to be pulled out to unlock, after the unlocking button is released, the two locking posts are reset under the action of the first reset spring, during the adjustment of the rotating wheel assembly, the second reset spring always applies a force to the movable plate, and the rotating wheel assembly applies an opposite force to the movable plate, so that the abutting piece on the movable plate is kept in the central position of the unlocking button and abuts against the unlocking button, the unlocking button cannot be pressed downward, the first reset spring drives the locking post to extend into the lock hole, and the locking post is clamped into the locking rod; when the rotating wheel assembly is rotated, the rotating wheel assembly eliminates the pressure on the movable plate, so that the abutting piece is located on one side of the unlocking button under the action of the second reset spring, the unlocking button is pressed downward, the locking post is retracted inward through the abutting block and the extrusion block, the first reset spring is extruded, and the locking post is retracted from the lock hole into the sliding groove, thereby achieving unlocking, the driving wheel is driven to rotate by rotating the code wheel, and when a user forgets the password of the rotating wheel assembly, at this time, the spare key can be inserted into the lock cylinder, the lock cylinder is rotated while being screwed, the limiting block on the limiting rod is clamped into the limiting groove of the driving wheel, the lock cylinder abuts against the limiting rod and moves along the mounting groove, and the compression spring is extruded, so that the limiting rod is reset, when the limiting block on the limiting rod is clamped into the limiting groove of the driving wheel, the rotating wheel assembly cannot be rotated, at this time, the corresponding password is the correct password, the unlocking button can be pressed to open the password lock, thereby avoiding the lock body from being scrapped due to forgetting the password.

[0009] Further, the edge of the driving wheel is provided with a notch; the movable plate can move between the rotating wheel assembly and the bottom of the box body, and the surface of the movable plate facing the rotating wheel assembly is provided with a protrusion capable of engaging with the notch.

[0010] The movable plate is compressed and retracted by the engagement of the notch on the driving wheel and the protrusion on the movable plate.

[0011] Further, the mounting frame comprises two mounting plates, the top end of each mounting plate is provided with a sliding groove, the two ends of the mounting shaft are slidably arranged in the two sliding grooves, the baffle abuts against the inner side of one of the mounting plates, the four driving wheels are connected in an axial manner on the mounting shaft, one end of the mounting shaft is sleeved with a limiting spring, the limiting spring is arranged between one of the mounting plates and the rotating wheel assembly, the other end of the mounting shaft is sleeved with a toggle lever, the toggle lever is L-shaped, one end of the toggle lever extends out of the box body, an L-shaped toggle slot is formed on the box body corresponding to the position where the toggle lever extends out, the other end of the toggle lever is located in the box body and is provided with a jacking block at the lower end, the jacking block is arranged below the movable plate, and the second reset spring is arranged at the end of the movable plate away from the abutting piece.

[0012] The card piece is embedded into the groove of the password wheel, which facilitates the rotation of the driving wheel driven by the password wheel, and further realizes the tightening and loosening of the movable plate by the rotating assembly, which is beneficial to the control of the lock password; and after the password wheel is moved to the correct number, the notch on the driving wheel engages with the protrusion on the movable plate, the pressure of the driving wheel on the movable plate is reduced, the movable plate rises away from the one end of the abutting piece under the action of the second reset spring, the abutting piece descends, the driving rod is transversely moved along the driving groove, and further pushes the rotating assembly to move on the movable plate, lifts the driving rod upward, the lifting block moves downward, the upward support of the lifting block on the movable plate is released, the abutting piece abuts against the bottom of the box body, and the pressing of the unlocking button is no longer affected, the unlocking button is pressed downward, the locking column is retracted, and the password lock is opened.

[0013] Further, the pre-tightening mechanism includes a bottom plate and U-shaped elastic pieces, the bottom plate is fixedly arranged at the bottom of the box body, the U-shaped elastic pieces are arranged with openings upward, one side of the U-shaped elastic pieces is fixedly connected with the bottom plate, the U-shaped elastic pieces are provided with four, the four U-shaped elastic pieces are respectively arranged corresponding to the four password wheels, the surface of the password wheel is provided with pre-tightening grooves, the pre-tightening grooves are provided with a plurality of, the plurality of pre-tightening grooves are uniformly arranged in the circumferential direction of the password wheel, and the password wheel between the adjacent two pre-tightening grooves is engraved with numbers, and the U-shaped elastic pieces engage with the pre-tightening grooves.

[0014] The pre-tightening mechanism can provide certain resistance and positioning ability for the rotation of the password wheel, so that the password wheel is prevented from rotating easily.

[0015] Further, the box body includes an upper cover and a bottom shell, the upper cover and the bottom shell are buckled together and connected by bolts, and the upper cover and the bottom shell are respectively provided with fixed sleeve shells at two ends after being buckled together.

[0016] In this way, the overall disassembly convenience and the stability of the box body structure are ensured.

[0017] In summary, the beneficial effects of the present application are as follows:

[0018] This invention, during use, adjusts the rotating wheel assembly so that the unlocking button is unaffected by the assembly. Pressing down on the unlocking button causes the two locking pins to retract inward, facilitating the removal of the lock rod for unlocking. Releasing the unlocking button returns the two locking pins to their original position under the action of the first return spring. While adjusting the rotating wheel assembly, the second return spring continuously applies a spring force to the movable plate, while the rotating wheel assembly applies the opposite force, keeping the abutment plate on the movable plate in the center of the unlocking button, preventing further downward pressing. The first return spring then drives the locking pins to extend into the keyhole, where they engage with the lock rod. When the rotating wheel assembly is rotated, the pressure on the movable plate is relieved, causing the abutment plate, under the action of the second return spring, to be positioned on the side of the unlocking button, thus unlocking the lock. Pressing the button down causes the locking pin to retract inward via the top block and the pressing block, compressing the first return spring and causing it to retract from the keyhole into the sliding groove, thus unlocking the lock. Rotating the combination wheel drives the drive wheel to rotate. If the user forgets the combination for the combination wheel assembly, a spare key can be inserted into the lock cylinder. While turning the lock cylinder, the combination wheel assembly is rotated. The limit block on the limit rod engages with the limit groove of the drive wheel, causing the lock cylinder to move along the mounting groove against the limit rod and compress the compression spring. The compression spring facilitates the limit rod's reset. When all the limit blocks on the limit rod are engaged with the limit groove of the drive wheel, the combination wheel assembly cannot rotate. At this point, the correct combination is displayed. The unlock button can then be pressed to open the combination lock, thus preventing the lock from becoming unusable due to a forgotten combination. Attached Figure Description

[0019] Figure 1 This is a front view of the overall structure of this utility model;

[0020] Figure 2 This is a bottom view of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the box in this utility model;

[0022] Figure 4 This is a schematic diagram of the password wheel in this utility model;

[0023] Figure 5 This is a schematic diagram of the toggle lever in this utility model;

[0024] Figure 6 This is a schematic diagram of the drive wheel in this utility model;

[0025] Figure 7 This is a schematic diagram of the pre-tightening mechanism in this utility model;

[0026] Figure 8 This is a schematic diagram of the mounting shaft in this utility model.

[0027] In the diagram: 1. Box body; 11. Lock hole; 12. Unlock button; 13. Locking pin; 14. Sliding groove; 15. Pressing block; 16. Top block; 17. First return spring; 18. Top cover; 19. Bottom shell; 2. Combination wheel assembly; 21. Mounting bracket; 211. Mounting plate; 212. Sliding groove; 22. Mounting shaft; 221. Baffle; 222. Mounting groove; 223. Mounting rod; 224. Compression spring; 225. Limiting rod 226. Limiting block; 23. Rotary wheel assembly; 231. Drive wheel; 232. Combination wheel; 233. Rotating hole; 234. Connecting hole; 235. Notch; 236. Groove; 237. Locking piece; 238. Limiting groove; 24. Movable plate; 241. Abutting piece; 25. Actuating rod; 26. Actuating groove; 27. Lifting block; 3. Lock cylinder; 4. Pre-tightening mechanism; 41. Base plate; 42. U-shaped spring; 5. Fixed sleeve. Detailed Implementation

[0028] Example 1:

[0029] like Figures 1-8 As shown, a combination lock for a U-shaped lock includes a housing 1. Two through-holes 11 for inserting a U-shaped lock rod are provided on the side of the housing 1. A combination wheel 232 assembly 2 and an unlocking button 12 are provided on the housing 1. A lock cylinder 3 is provided on the housing 1 and is connected to the combination wheel assembly 2.

[0030] Two locking pins 13 are symmetrically arranged inside the box body 1 corresponding to the two lock holes 11. The box body 1 is provided with a sliding groove 14 that extends and retracts for each locking pin 13. One end of the locking pin 13 extends into the lock hole 11, and the other end is provided with a top block 16. An unlocking button 12 is provided at the center of the side of the box body 1 near the locking pin 13. A pressing block 15 is provided at the lower end of the unlocking button 12. The side of the pressing block 15 away from the lock hole 11 is an inclined surface. The side of the top block 16 near the lock hole 11 is an inclined surface. The pressing block 15 and the inclined surface of the top block 16 abut against each other. A first return spring 17 is provided between the two locking pins 13 to drive the locking pins 13 back to the lock hole 11. The combination wheel 232 assembly 2 abuts against the two locking pins 13.

[0031] The password wheel assembly 2 comprises a mounting rack 21 arranged on the inner side of the box body 1, the mounting rack 21 is provided with a mounting shaft 22, the axis of the mounting shaft 22 is perpendicular to the axis of the lock hole 11, at least four rotating wheel assemblies 23 are rotatably arranged on the mounting shaft 22, an activity plate 24 is arranged below the rotating wheel assemblies 23, the activity plate 24 is provided with an abutting piece 241 near one end of the unlocking button 12, a second reset spring (not shown in the figure) is arranged between the activity plate 24 and the bottom of the box body 1, the edge of the activity plate 24 is in abutting fit with the inner wall of the box body 1; the box body 1 is provided with an opening for each rotating wheel assembly 23 to expose; the rotating wheel assembly 23 comprises a driving wheel 231 and a password wheel 232, the driving wheel 231 is provided with a rotating hole 233 along the axis and is rotatably connected to the mounting shaft 22 through the rotating hole 233, the password wheel 232 is provided with a connecting hole 234 along the axis and is sleeved on the driving wheel 231 through the connecting hole 234;

[0032] The password wheel 232 is provided with ten grooves 236 on the side close to the corresponding driving wheel 231, the ten grooves 236 are circumferentially distributed along the axis of the connecting hole 234, the ten grooves 236 are in communication with the connecting hole 234, the driving wheel 231 is formed with four clamping pieces 237 at positions corresponding to the grooves 236 on the side close to the corresponding password wheel 232, each clamping piece 237 is nested in the corresponding groove 236 on the password wheel 232, a limiting groove 238 is formed on the inner side of the driving wheel 231 along the axis direction, a mounting groove 222 is formed on the side of the mounting shaft 22 along the length direction of the mounting shaft 22, the mounting shaft 22 is provided with a baffle 221 at one end, the baffle 221 is in abutting fit with the mounting groove 222 on one side, the other end is connected with a mounting rod 223, two opposite planes are formed on the side of the mounting rod 223, which is convenient for limiting the mounting shaft 2 and preventing it from rotating, the mounting groove 222 is provided with a compression spring 224 at the end close to the baffle 221, a limiting rod 225 is slidably arranged in the mounting groove 222, at least four limiting blocks 226 are arranged on the limiting rod 225 corresponding to the limiting grooves 238, the four limiting blocks 226 correspond to the four driving wheels 231 respectively, the driving wheel 231 passes through the mounting rod 223 and the limiting rod 225, the limiting groove 238 of the driving wheel 231 is in abutting fit with the limiting block 226 after passing through the limiting block 226, one end of the limiting rod 225 is in abutting fit with the compression spring 224, and the other end extends to the lock cylinder 3.

[0033] The working principle and process are as follows:

[0034] In use, the rotating wheel assembly is adjusted so that the unlocking button is not affected by the rotating wheel assembly, the unlocking button is pressed downward, the two locking posts are retracted inward, thereby facilitating the unlocking rod to be pulled out to unlock, after the unlocking button is released, the two locking posts are reset under the action of the first reset spring, in the adjustment of the rotating wheel assembly, the second reset spring always applies elastic force to the movable plate, and the rotating wheel assembly applies opposite force to the movable plate, so that the abutting piece on the movable plate is kept in the central position of the unlocking button and abuts against the unlocking button, the unlocking button cannot be pressed downward, the first reset spring drives the locking post to extend into the lock hole, and the locking post is clamped into the locking rod; when the rotating wheel assembly is rotated, the rotating wheel assembly eliminates the pressure on the movable plate, so that the abutting piece is located on one side of the unlocking button under the action of the second reset spring, the unlocking button is pressed downward, the locking post is retracted inward through the top block and the extrusion block, the first reset spring is extruded, and the locking post is retracted into the sliding groove from the lock hole, so that unlocking is realized, the driving wheel is driven to rotate through the rotation of the password wheel, when the user forgets the password of the rotating wheel assembly, at this time, the spare key can be inserted into the lock cylinder, the lock cylinder is rotated while the rotating wheel assembly is rotated, the limiting block on the limiting rod is clamped into the limiting groove of the driving wheel, the lock cylinder is moved along the mounting groove by abutting against the limiting rod, and the compression spring is extruded, so that the limiting rod is reset, when the limiting block on the limiting rod is clamped into the limiting groove of the driving wheel, the rotating wheel assembly cannot be rotated, at this time, the corresponding password is the correct password, and the password lock can be opened by pressing the unlocking button, so that the lock body can be avoided from being scrapped due to forgetting the password.

[0035] In another embodiment of the present application, as shown in Figures 1-8 The edge of the driving wheel 231 is provided with a notch 235, and the movable plate 24 can move between the rotating wheel assembly 23 and the bottom of the box body 1, and the surface of the movable plate 24 facing the rotating wheel assembly 23 is provided with a protrusion capable of engaging with the notch 235.

[0036] The notch 235 on the driving wheel 231 engages with the protrusion on the movable plate 24, so that the movable plate 24 is compressed and retracted.

[0037] In another embodiment of the present application, as shown in Figure 4 and Figure 6As shown, the mounting frame 21 comprises two mounting plates 211, the top end of each of the mounting plates 211 is provided with a sliding groove 212, the two ends of the mounting shaft 22 are slidingly arranged in the two sliding grooves 212, the baffle 221 abuts the inner side of one of the mounting plates 211, the four driving wheels 231 are connected to the mounting shaft 22 in an axial manner, one end of the mounting shaft 22 is sleeved with a limiting spring, the limiting spring is arranged between the one of the mounting plates 211 and the rotating wheel assembly 23, the other end of the mounting shaft 22 is sleeved with the pushing rod 25, the pushing rod 25 is L-shaped, one end of the pushing rod 25 extends out of the box body 1, the box body 1 is provided with an L-shaped pushing groove 26 corresponding to the position where the pushing rod 25 extends out, the other end of the pushing rod 25 is located in the box body 1 and is provided with a jacking block 27 at the lower end, the jacking block 27 is arranged below the movable plate 24, and the second reset spring is arranged on the movable plate 24, away from the one end of the abutting piece 241.

[0038] The code piece 237 is embedded into the groove 236 of the password wheel 232, so that the password wheel 232 drives the driving wheel 231 to rotate, thereby realizing the tightening and loosening of the movable plate 24 by the rotating wheel assembly 23, and being beneficial to the control of the lock password; after the password wheel 232 is pushed to the correct number, the notch 235 on the driving wheel 231 is engaged with the protrusion on the movable plate 24, the pressure of the driving wheel 231 on the movable plate 24 is reduced, the one end of the movable plate 24 away from the abutting piece 241 is lifted under the action of the second reset spring, the abutting piece 241 is lowered, the pushing rod 25 is transversely moved along the pushing groove 26, thereby pushing the rotating wheel assembly 23 to move on the movable plate 24, lifting the pushing rod 25 upwards, the jacking block 27 moves downwards, the upward support of the jacking block 27 on the movable plate 24 is released, the abutting piece 241 abuts the bottom of the box body 1 and no longer affects the pressing of the unlocking button 12, the unlocking button 12 is pressed downwards, so that the locking column 13 is retracted, thereby opening the combination lock.

[0039] In another embodiment of the present application, as shown in Figure 7 The pre-tightening mechanism 4 comprises a bottom plate 41 and U-shaped elastic sheets 42, the bottom plate 41 is fixedly arranged at the bottom of the box body 1, the U-shaped elastic sheets 42 are arranged with openings facing upwards, one side of the U-shaped elastic sheet 42 is fixedly connected with the bottom plate 41, and four U-shaped elastic sheets 42 are arranged.

[0040] The pre-tightening mechanism 4 can provide certain resistance and positioning ability for the rotation of the password wheel 232, so that the password wheel 232 is not easily rotated.

[0041] In another embodiment of the present application, as shown in Figures 1-8As shown, the box body 1 is a cuboid structure, the box body 1 comprises an upper cover 18 and a bottom shell 19, the upper cover 18 and the bottom shell 19 are bolted together after being buckled together, the upper cover 18 and the bottom shell 19 are respectively sleeved with a fixed sleeve 5 at both ends after being buckled together, the fixed sleeve 5 is a cuboid shell, is nested on the box body 1, and a through hole is formed in the fixed sleeve 5 at a position corresponding to a lock hole.

[0042] In this way, the overall disassembly convenience of the box body 1 and the stability of the structure of the box body 1 are ensured.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A combination lock for a U-lock, characterized in that The utility model provides a lock, including box body, two lock holes for inserting U type lock bar are set up on the lateral surface of box body, the box body is provided with password wheel subassembly and lock button, the box body is provided with lock core, and the lock core is connected with password wheel subassembly; Two locking columns are symmetrically arranged in the box body corresponding to the two lock holes, and a sliding groove corresponding to each locking column is arranged in the box body, one end of the locking column extends into the lock hole, and the other end is provided with a top block, the central position of the side surface of the box body close to the locking column is provided with a lock button, the lower end of the lock button is provided with a extrusion block, the side of the extrusion block away from the lock hole is an inclined surface, the side of the top block close to the lock hole is an inclined surface, the inclined surfaces of the extrusion block and the top block abut, a first reset spring for driving the locking column to move back to the lock hole is arranged between the two locking columns, and the password wheel subassembly abuts the two locking columns. The password wheel subassembly includes a mounting frame arranged on the inner side of the box body, the mounting frame is provided with a mounting shaft, the axis of the mounting shaft is perpendicular to the axis of the lock hole, at least four rotating wheel assemblies are rotatably arranged on the mounting shaft, an activity plate is arranged below the rotating wheel assembly, the end of the activity plate close to the lock button is provided with an abutting piece, a second reset spring is arranged between the activity plate and the bottom of the box body, and the edge of the activity plate abuts the inner wall of the box body; an opening is formed in the box body for each rotating wheel assembly to expose; the rotating wheel assembly includes a driving wheel and a password wheel, the driving wheel is rotatably connected to the mounting shaft through a rotating hole formed along the axis, and the password wheel is sleeved on the driving wheel through a connecting hole formed along the axis; ten recesses are formed in the side of the password wheel close to the corresponding driving wheel, the ten recesses are circumferentially distributed along the axis of the connecting hole, the ten recesses are communicated with the connecting hole, and a plurality of clamping pieces are formed at intervals corresponding to the recesses on the side of the driving wheel close to the corresponding password wheel, each clamping piece is nested in the corresponding recess on the password wheel, a limiting groove is formed in the inner side of the driving wheel along the axis direction, a mounting groove is formed in the side of the mounting shaft along the length direction, a baffle is arranged at one end of the mounting shaft, the side of the baffle abuts the mounting groove, the other end of the baffle is connected with a mounting rod, two opposite planes are formed on the side of the mounting rod, a compression spring is arranged at one end of the mounting groove close to the baffle, a limiting rod is slidably arranged in the mounting groove, at least four limiting blocks are arranged on the limiting rod corresponding to the limiting groove, the driving wheel passes through the mounting rod and the limiting rod, the limiting groove of the driving wheel is limited by the abutting limiting block after passing through the limiting block, one end of the limiting rod abuts the compression spring, and the other end of the limiting rod extends to the lock core.

2. The combination lock for a U-lock according to claim 1, characterized in that The edge of the driving wheel is provided with a notch; the activity plate can move between the rotating wheel assembly and the bottom of the box body, and the surface of the activity plate facing the rotating wheel assembly is provided with a protrusion capable of engaging with the notch.

3. The combination of claim 2 wherein: The mounting frame comprises two mounting plates, each of which is provided with a sliding groove at the top end, both ends of the mounting shaft are slidingly arranged in the two sliding grooves, the baffle abuts against the inner side of one of the mounting plates, four driving wheels are axially and oppositely connected on the mounting shaft, one end of the mounting shaft is sleeved with a limiting spring, the limiting spring is arranged between one of the mounting plates and the rotating wheel assembly, the other end of the mounting shaft is sleeved with a poking rod, the poking rod is L-shaped, one end of the poking rod extends out of the box body, the box body is provided with an L-shaped poking groove at a position corresponding to the extending position of the poking rod, the other end of the poking rod is located in the box body and is provided with a jacking block at the lower end, the jacking block is arranged below the movable plate, and the second reset spring is arranged at one end of the movable plate away from the abutting piece.

4. The combination of claim 3 wherein: The pre-tightening mechanism comprises a bottom plate and U-shaped elastic sheets, the bottom plate is fixedly arranged at the bottom of the box body, the U-shaped elastic sheets are arranged with their openings upward, one side of the U-shaped elastic sheets is fixedly connected with the bottom plate, the U-shaped elastic sheets are provided with four, the four U-shaped elastic sheets are respectively arranged corresponding to the four code wheels, the surface of the code wheel is provided with a pre-tightening groove, the pre-tightening groove is provided with a plurality of, the plurality of pre-tightening grooves are uniformly arranged in the circumferential direction of the code wheel, the code wheel between two adjacent pre-tightening grooves is engraved with a number, and the U-shaped elastic sheet is engaged with the pre-tightening groove.

5. The combination of claim 3 wherein: The box body comprises an upper cover and a bottom shell, the upper cover and the bottom shell are connected by bolts after being buckled together, and the upper cover and the bottom shell are respectively sleeved with fixed sleeve shells at both ends after being buckled together.

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