Automobile lock cylinder theftproof structure

Abstract

The application discloses an automobile lock cylinder anti-theft structure, which comprises a rotor arranged in a shell, the rotor is provided with an upper cover at one end, the other end of the rotor is hinged with a transmission rod, the end of the transmission rod is used for being connected with a door lock to be locked, the rotor is provided with a rotor protection module for preventing the rotor from rotating around the shell, and the rotor protection module is arranged between the shell and a reed group. A transmission rod protection module is sleeved on the transmission rod, the transmission rod protection module is used for rotating when an outer clamping device clamps the transmission rod protection module, and the transmission rod does not rotate. The application is provided with the locking block which is linked with the reed and can effectively lock the rotor when an illegal key rotates the rotor, so that destructive rotation of the reed under the action of illegal forced rotation force is avoided. In addition, the transmission rod protection module realizes isolation of the transmission rod from the outside through a protection shell and a sleeve, so that the transmission rod is prevented from being illegally contacted and forced to rotate to cause the door to be illegally unlocked.

Description

Technical Field

[0001] This invention relates to the field of automobile bodies and components, and specifically to an anti-theft structure for automobile lock cylinders. Technical Background

[0002] Currently, car lock cylinders are generally installed near the driver's door handle on the outside, providing mechanical unlocking functionality. With advancements in automotive comfort and electrification, most vehicles now feature electronic door unlocking, and drivers are accustomed to using this method to enter the vehicle, reducing the likelihood of using the car lock cylinder. However, electronic unlocking is not 100% reliable. To ensure the driver can still enter the vehicle in case of a dead battery or other electronic unlocking failures, the car lock cylinder remains on the driver's door. While providing mechanical door opening, the car lock cylinder also introduces the risk of unauthorized entry; therefore, it must also possess anti-theft functionality.

[0003] like Figure 1 As shown, the function of a current car lock cylinder is to transmit the rotation of a legitimate key to the lock, thereby unlocking the door. The main components of the lock cylinder involved in this rotational transmission are the rotor and the drive rod. These two components are easily accessible to unauthorized keys or tools from the front or top of the door, causing forced and destructive rotation and resulting in unauthorized unlocking. Current anti-theft methods rely solely on a spring to detect unauthorized keys and jam the spring, thus restricting the rotation of the drive rod. However, the spring is easily deformed. If the spring is completely destroyed by a large external force, it can no longer jam, rendering the legitimate key ineffective. Even if the spring is slightly deformed, after the unauthorized action is stopped, the legitimate key cannot fully retract the spring into the rotor, also rendering the legitimate key ineffective. Summary of the Invention

[0004] This invention provides an anti-theft structure for car lock cylinders, which can solve the problem that the spring is jammed and the legitimate key becomes invalid when the rotor is subjected to illegal forced rotation.

[0005] This invention provides an anti-theft structure for a car lock cylinder, including a rotor disposed inside a housing. One end of the rotor is provided with a top cover, and the other end of the rotor is hinged to a transmission rod. The end of the transmission rod is used to connect and lock with a door lock. The rotor is provided with a rotor protection module to prevent the rotor from rotating around the housing. The rotor protection module is disposed between the housing and the spring assembly.

[0006] Furthermore, each reed in the reed assembly is provided with a reed groove that cooperates with the rotor protection module.

[0007] Furthermore, the housing is provided with a spring-restricting groove for inserting a single spring and a locking block-restricting groove for inserting the end of the rotor protection module.

[0008] Furthermore, the rotor protection module includes a locking block, the locking block including a locking block engaging portion that mates with the locking block limiting groove portion, and a locking block connecting portion adapted to the spring plate groove portion is provided below the locking block.

[0009] Furthermore, the height at which the locking block engaging portion engages with the locking block limiting groove is less than the height at which the locking block connecting portion engages with the spring groove.

[0010] Furthermore, the locking block is also provided with a locking block spring mechanism, which is used to cause the locking block to leave the locking block limiting groove and enter the spring groove.

[0011] Furthermore, the locking block spring mechanism includes locking block blind holes located on both sides of the locking block, a locking block spring in a compressed state is placed in the locking block blind hole, and a cover plate for restricting the movement of the locking block spring is fixedly provided above the locking block spring, with the end of the cover plate disposed on the rotor.

[0012] Furthermore, a transmission rod protection module is sleeved on the transmission rod. The transmission rod protection module is used to ensure that when the external clamping device clamps the transmission rod protection module, the transmission rod protection module rotates while the transmission rod does not rotate.

[0013] Furthermore, the transmission rod protection module includes a hollow protective shell structure and a sleeve that is interference-fitted with the protective shell structure. The sleeve can be assembled from one end of the transmission rod, and the outer surface of the protective shell structure is provided with circumferential ribs on the outer surface to restrict the axial movement of the sleeve.

[0014] Furthermore, the protective shell structure includes multiple interlocking protective shells, and the mating surfaces of the upper and lower protective shells are respectively provided with multiple sets of interlocking concave and convex structures.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention, by setting a locking block that is linked with the spring, can effectively lock the rotor when an illegal key turns the rotor, preventing the rotor from being damaged by the spring under the action of illegal forced rotation, thus preventing the door from being illegally unlocked or the legitimate key from becoming invalid after the illegal rotation is stopped;

[0017] 2. The transmission rod protection module of the present invention isolates the transmission rod from the outside world through a protective shell and a sleeve, preventing the transmission rod from being illegally contacted and forcibly rotated, which would result in the door being illegally unlocked. Attached Figure Description

[0018] Figure 1 A schematic diagram showing the existing lock cylinder and door lock positions;

[0019] Figure 2 A three-dimensional schematic diagram of the overall structure of the anti-theft lock cylinder of this invention;

[0020] Figure 3 Exploded view of the overall structure of the anti-theft lock cylinder of this invention;

[0021] Figure 4 1. Three-dimensional schematic diagram of the rotor structure;

[0022] Figure 5 Schematic diagram of the rotor structure in longitudinal section;

[0023] Figure 6 1. Three-dimensional schematic diagram of the transmission rod structure;

[0024] Figure 7 Schematic diagram of the longitudinal section of the transmission rod structure;

[0025] Figure 8 A longitudinal section diagram of the combined structure of the transmission rod and rotor;

[0026] Figure 9 1. Three-dimensional schematic diagram of the reed structure;

[0027] Figure 10 1. Three-dimensional schematic diagram of the shell structure;

[0028] Figure 11 Schematic diagram of the longitudinal section of the shell structure;

[0029] Figure 12 1. Three-dimensional schematic diagram of the locking block structure;

[0030] Figure 13 A longitudinal section diagram of the rotor protection module when the locking block has not left the locking block's limiting groove.

[0031] Figure 14 A cross-sectional view of the rotor protection module when the locking block has not left the locking block's limiting groove.

[0032] Figure 15 A cross-sectional view of the rotor protection module when the locking block is separated from the locking block's limiting groove.

[0033] Figure 16 1. 3D schematic diagram of the protective casing;

[0034] Figure 17 A longitudinal section diagram of the transmission rod protection module;

[0035] Figure 18 1. Three-dimensional schematic diagram of the upper cover structure;

[0036] Figure 19 1. Three-dimensional schematic diagram of the spring clip structure;

[0037] Figure 20 A longitudinal section diagram of the dustproof and waterproof module;

[0038] Reference numerals: 1. Housing; 1.1. Housing recessed portion; 1.11. Housing recessed portion with small hole; 1.12. Housing recessed portion with large hole; 1.2. Spring limiting groove; 1.3. Locking block limiting groove; 2. Top cover; 2.1. Top cover hole; 2.2. Top cover groove; 2.3. Top cover arc-shaped step; 3. Spring; 3.1. Spring square protrusion; 4. Spring torsion spring; 5. Rotor; 5.1. Rotor rectangular blind hole; 5.2. Rotor positioning protrusion; 5.3. Rotor cylindrical blind hole; 5.4. Rotor cylindrical through hole; 5.5. Rotor spring hole; 5.6. Rotor spring hole; 5.7. Rotor groove; 5.8. Rotor rectangular protrusion; 5.9. Rotor locking block placement slot; 6. Pad; 7. Transmission 7.1. Transmission rod spherical crown; 7.2. Transmission rod through hole; 7.3. Inner end of transmission rod; 7.4. Circumferential groove of transmission rod; 8. Protective shell structure; 8.1. Long groove of protective shell; 8.2. Long boss of protective shell; 8.3. Circumferential rib on inner surface; 8.4. Circumferential rib on outer surface; 8.5. Axial rib on outer surface; 9. Sleeve; 10. Cover plate; 11. Locking block; 11.1. Locking block connecting part; 11.2. Locking block snap-fit ​​part; 11.3. Locking block blind hole; 12. Locking block spring; 13. Rotor torsion spring; 14. Spring assembly; 14.1. First spring protrusion; 14.2. Second spring protrusion; 14.3. Spring groove; 15. Spring spring; 16. Pin; 17. Door lock. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1-20 The present invention will be further described in detail with reference to specific embodiments.

[0040] The car lock cylinder of this invention consists of a transmission module, a valid key verification module, a rotor protection module, a transmission rod protection module, and a dustproof and waterproof module. For example... Figures 1-3 As shown, the car lock cylinder anti-theft structure includes a rotor protection module for front anti-theft and a transmission rod protection module for side anti-theft. The rotor protection module is set inside the rotor 5 inside the housing 1. One end of the rotor 5 is provided with a top cover 2, and the top cover 2 is provided with a square hole for inserting a key. The other end of the rotor 5 is hinged to the transmission rod 7. The end of the transmission rod 7 is used to connect and lock with the door lock 17. The rotor 5 is provided with a rotor protection module to prevent the rotor 5 from rotating around the housing 1. The rotor protection module is located between the housing 1 and the spring group 14.

[0041] like Figure 2 , 3As shown in Figure 8, the transmission module includes a rotor 5, a pad 6, a pin 16, a transmission rod 7, and a rotor torsion spring 13. The transmission module is responsible for transmitting the rotation of the key to the door lock 17. Figures 4-5 As shown, the rotor 5 is nearly cylindrical. A rotor locking block placement groove 5.9 for placing the locking block 11 is provided in the middle of the rotor 5. A rectangular blind hole 5.1 for inserting a key is located in the middle of the upper end of the rotor 5. The size of the rectangular blind hole 5.1 is slightly larger than the size of the key. A key rotor positioning protrusion 5.2 is located at the bottom of the blind hole. A cylindrical blind hole 5.3 is located in the middle of the lower end face of the rotor. A cylindrical through hole 5.4 for the pin 16 to pass through is provided on the side of the rotor. The rotor also has a rotor spring hole 5.5 for placing the spring assembly 14 and a rotor spring spring hole 5.6 for the spring spring 15 in the middle of the rotor.

[0042] In this embodiment, as Figures 6-7 As shown, the transmission rod 7 is cylindrical in the middle, with one end being a transmission rod spherical crown 7.1. The transmission rod spherical crown 7.1 has a double V-shaped transmission rod through hole 7.2 in the middle of both sides. The other end is a near-spherical transmission rod inner end 7.3 connected to the door lock 17. The middle is provided with a transmission rod circumferential groove 7.4 that cooperates with the circumferential rib 8.3 on the inner surface of the protective shell 8.

[0043] like Figures 5-8 As shown, in this embodiment, the pad 6 is a solid cylinder made of EPDM rubber. The outer diameter of the pad 6 is slightly smaller than the inner diameter of the rotor cylindrical blind hole 5.3 on the lower end face of the rotor 5. The pad 6 is located in the rotor cylindrical blind hole 5.3 on the lower end face of the rotor 5, serving to prevent vibration and abnormal noise between the rotor 5 and the transmission rod 7. After assembly, the spherical crown 7.1 of the transmission rod is located in the rotor cylindrical blind hole 5.3. The transmission rod through hole 7.2 is coaxial with the rotor cylindrical through hole 5.4. The transmission rod through hole 7.2 is double V-shaped and connected together by the pin 16. The transmission rod 7 can rotate relative to the rotor 5 at a certain angle along the V-hole direction and the axial direction of the pin 16, with a rotation angle of ±30°. The inner end 7.3 of the transmission rod at the other end of the transmission rod 7 is fitted with the near-spherical hexagonal feature of the door lock 17, and the two can rotate at a certain angle.

[0044] In this embodiment, during operation, the key is inserted into the rectangular blind hole 5.1 at the upper center of the rotor 5 until it contacts the key rotor positioning protrusion 5.2 at the bottom of the blind hole. At this time, turning the key will drive the rotor 5 to rotate, and with the connection of the pin 16, the rotation is further transmitted to the transmission rod 7. Finally, the inner end 7.3 of the transmission rod cooperates with the near-spherical features of the six inner sides of the door lock 17 to transmit the power to the door lock 17. Since the transmission rod 7 can rotate at a certain angle relative to the rotor 5 along the V-hole direction and the pin axis, and the other end of the transmission rod 7 can also rotate at a certain angle relative to the door lock, even if there is a certain height difference or front-to-back position difference between the door lock and the lock cylinder, it will not affect the transmission of key rotation, and the arrangement of the lock cylinder position is less restricted.

[0045] In this embodiment, as Figures 10-15 The valid key determination module is responsible for determining whether the key inserted into the lock cylinder is a valid key. It includes a reed group 7, and a single reed group 7 includes 7 reeds and 7 reed springs 15 that cooperate with the reeds.

[0046] like Figure 9 As shown, in this embodiment, preferably, a single spring is a thin sheet with inner and outer double rectangles, with a thickness of 0.9 mm and made of CuZn36H16 material. Its length is slightly smaller than the outer diameter of the rotor 5. The long side of its outer rectangle has an arc-shaped first spring protrusion 14.1 that cooperates with the spring 15, and the long side of its inner rectangle has a square second spring protrusion 14.2 that cooperates with the key.

[0047] like Figure 10 , 11As shown in Figure 20, in this embodiment, the housing 1 is an integrally cast zinc alloy part, with an inverted housing recess 1.1 inside. The housing recess 1.1 has a housing recess small hole 1.11 that mates with the top of the upper cover 2 and a housing recess large hole 1.12 that mates with the arc-shaped step 2.3 of the upper cover, arranged sequentially from the outside to the inside. The inner diameter of the housing recess large hole 1.12 is slightly larger than the outer diameter of the rotor 5. On the side wall of the recess large hole 1.12, there are two spring limiting grooves 1.2 that mate with the spring group 14 and a locking block limiting groove 1.3 that mates with the locking block 11. The included angle between the locking block limiting groove 1.3 and the single spring limiting groove 1.2 is 90°. After assembly, seven reeds are sequentially installed in the rotor reed holes 5.5 from two opposite sides of the rotor 5. The reed spring 15 is installed in the rotor reed spring hole 5.6. One end of the reed spring 15 abuts against the rotor 5, and the other end abuts against the first reed protrusion 14.1 on the long side of the outer rectangle of the reed. The assembly consisting of the rotor 5, the reed group 14, and the reed spring 15 is located inside the housing 1. The upper end face of the rotor 5 abuts against the end face of the small hole 1.11 of the housing countersunk platform. The cylindrical outer surface of the rotor 5 mates with the large hole 1.12 of the housing countersunk platform. Under the action of the reed spring 15, the side of the reed 14 extends into the large hole 1.12 of the housing countersunk platform and into the reed limiting groove 1.2 of the large hole 1.12 of the housing countersunk platform, thus limiting the rotation of the rotor 5 relative to the housing 1.

[0048] During operation, when the key is inserted into the lock cylinder rotor 5, the second spring protrusion 14.2 on the long rectangular side of the spring plate enters the toothed groove of the key. Depending on the shape of the toothed groove, the second spring protrusion 14.2 on the long rectangular side of the spring plate moves accordingly, causing the spring plate to move within the rotor spring plate hole 5.5. When the toothed groove shape on a valid key matches the position of the second spring protrusion 14.2 on the long rectangular side of the spring plate, the spring plate assembly 14 can move completely into the rotor 5. At this time, the rotor 5 can rotate smoothly under the rotation of the valid key, driving the transmission rod 7 to rotate and unlock the door. However, when the toothed groove shape of an invalid key does not match the position of the second spring protrusion 14.2 on the long rectangular side of the spring plate, the spring plate cannot move into the rotor 5, continuing to restrict the rotation of the rotor 5 relative to the housing 1. In this case, the rotation of the key cannot be transmitted to the transmission rod 7, and the door cannot be unlocked.

[0049] In this embodiment, the invention is unique in that it proposes a rotor protection module, which is responsible for protecting the rotor from being forcibly unlocked or damaged by an illegal key. The rotor protection module of the invention is disposed between the housing 1 and the spring assembly 14, and includes a locking block 11, a cover plate 10 fixedly disposed on the rotor, and a locking block spring 12 that cooperates with the cover plate 10.

[0050] In this embodiment, as Figures 12-15As shown, the locking block 11 has a V-shaped lower part (locking block connecting part 11.1) and a Z-shaped upper part (locking block snap-fit ​​part 11.2), with a blind hole 11.3 at each end. The locking block 11 is made of zinc alloy to ensure its strength. Figure 1 As shown, the cover plate 10 is a rigid, U-shaped thin sheet, with both ends of the U-shaped thin sheet fixedly welded to the rotor 5. After assembly, the end of the locking block 11 is fixed inside the rotor 5, and the locking block spring 12 is located in the locking block blind holes 11.3 at both ends of the locking block 11. To ensure the stability of the locking block spring 12, one end of the locking block spring 12 abuts against the lower surface of the middle part of the rigid cover plate 10, and the other end abuts against the bottom of the locking block blind hole 11.3.

[0051] In this embodiment, as Figures 13-14 As shown, when the locking block is not disengaged from the locking block limiting groove, the locking block spring 12 is compressed, giving the locking block 11 a restoring force in the direction of the rotor 5. The height of the locking block engaging part 11.2 engaging into the locking block limiting groove 1.3 is less than the height of the locking block connecting part 11.1 engaging into the spring plate groove 14.3, ensuring that the locking block 11 can be fully retracted into the rotor 5 through the rotor locking block placement groove 5.9. The locking block connecting part 11.1 at the lower part of the locking block 11 extends into the rotor 5 through the rotor locking block placement groove 5.9 and contacts the long rectangular side of the spring plate group 14. The locking block engaging part 11.2 extends out of the rotor 5 and into the locking block limiting groove 1.3 inside the housing 1, restricting the rotation of the rotor 5 relative to the housing 1.

[0052] like Figures 13-15 As shown, in this embodiment, when the rotor protection module is working, the locking block 11 is always in contact with the long outer side of the rectangular spring under the rebound force of the locking block spring 12. When a valid key is inserted into the rotor 5, the spring assembly 14 is completely retracted into the rotor 5 under the action of the valid key tooth groove. The spring pushes the spring spring 15 to the left for further compression. Then, the spring groove 14.3 moves completely to the lower part of the locking block connecting part 11.1. At this time, the locking block 11 moves downward as a whole and falls into the spring groove 14.3 under the rebound force of the locking block spring 12. At this time, neither the left nor right ends of the spring 14 exceed the surface of the rotor 5, and the locking block engaging part 11.2 completely separates from the locking block on the housing 1. The groove 1.3 restricts the entry of the rotor 5 into the interior, thus no longer restricting the rotation of the rotor 5 relative to the housing 1. When an illegal key is inserted into the rotor, the locking block connecting part 11.1 abuts against the rectangular outer long side of a single spring. The spring groove 14.3 will not move completely to the bottom of the locking block connecting part 11.1. The locking block 11 is blocked by the rectangular outer long side of a certain spring and cannot move downward. At this time, the locking block engaging part 11.2 is still located in the locking block restricting groove 1.3 inside the housing, restricting the rotation of the rotor 5 relative to the housing 1.

[0053] After the valid key is removed, the reed, under the restoring force of the reed spring 15, moves to the right, extending beyond the rotor 5 and entering the reed limiting groove 1.2. This causes the locking block connecting part 11.1 to exit the reed groove 14.3 and abut against the rectangular outer long side of the reed again. Simultaneously, the locking block engaging part 11.2 re-enters the locking block limiting groove 1.3 in the housing 1, and the locking block spring 12 is compressed again. The locking block connecting part 11.1 and the reed groove 14.3 are V-shaped to facilitate quick engagement between the two.

[0054] This invention uses a locking block that is linked with a reed to effectively lock the rotor when an unauthorized key turns it. This prevents the rotor from being damaged by the reed under the force of unauthorized turning, thus avoiding the door being unlocked illegally or the legitimate key becoming invalid after the unauthorized turning action is stopped.

[0055] In this embodiment, as Figure 16 and 17 As shown, the transmission rod protection module includes a hollow protective shell structure 8 and an interference-fit sleeve 9. The protective shell structure 8 includes two symmetrically fitted protective shells. Two protective shells are provided because both ends of the transmission rod 7 have protruding structures, making direct fitting of the transmission rod protection module inconvenient. The protective shell structure 8 and the sleeve 9 are interference-fitted. In this embodiment, the interference fit is achieved by providing axially protruding ribs 8.5 on the outer surface of the protective shell. Figure 17 As shown, sleeve 9 is a hollow cylindrical shape with a thickness of 1mm, made of stainless steel. Its inner diameter is smaller than the axial rib 8.5 on the outer surface of the protective shell, ensuring an interference fit between the two.

[0056] In this embodiment, as Figure 17 As shown, the outer diameter of the protective shell structure 8 is larger than the relatively smaller outer diameter at both ends of the transmission rod 7, thereby ensuring that the sleeve 9 can be fitted onto the protective shell structure 8 from one end of the transmission rod 7 during assembly.

[0057] In this embodiment, the simultaneous installation of the interference-fit protective shell structure 8 and sleeve 9 is to protect the transmission rod from unauthorized contact and forced rotation unlocking. When the external clamping device holds the transmission rod protection module, the protective shell structure 8 and sleeve 9 rotate together, while the transmission rod 7 does not rotate, thus providing excellent protection for the transmission rod 7. Each protective shell is a hollow semi-cylindrical shape. The upper and lower parts of the inner surface of the protective shell each have one inner surface circumferential rib 8.3 that engages with the circumferential groove 7.4 of the transmission rod. The upper and lower parts of the outer surface each have two outer surface axial ribs 8.5, which are used for interference fit with the sleeve 9.

[0058] In this embodiment, as Figure 16As shown, the outer surface end of the protective shell is also provided with a circumferential rib 8.4, which is used to restrict the movement of the sleeve 9 in the axial direction.

[0059] In this embodiment, as Figure 15 As shown, the mating surfaces of the two protective shells consist of two sets of mutually cooperating concave-convex structures. These include a long groove 8.1 and a long boss 8.2 on the lower protective shell, and a long boss 8.2 on the upper protective shell (not shown in the figure) that mates with the long groove 8.1, and a long groove 8.2 that mates with the long boss 8.2. After assembly, the two protective shells surround the transmission rod 7 from two sides. The long boss 8.2 on one side inserts into the long groove 8.1 of the other protective shell, forming a cylindrical shape. Of course, the number of protective shells 8 can also be other than two, as long as the mutually cooperating concave-convex structure is used to ensure detachability. Preferably, the protective shells are made of polyoxymethylene (POM) and not metal, to prevent damage to the transmission rod 7 and to prevent abnormal noise.

[0060] In this embodiment, during operation, since the protective shell structure 8 and the sleeve 9 enclose the transmission rod 7 and can rotate freely around the transmission rod 7, external illegal tools can only contact the sleeve 9. Since the sleeve 9 and the protective shell structure 8 can rotate freely around the transmission rod 7 together, the rotational force of the external clamping device acting on the sleeve 9 cannot be transmitted to the transmission rod 7, thus preventing the door lock from being unlocked. At the same time, the sleeve 9 is made of stainless steel, which has a certain strength and will not easily deform, thereby effectively protecting the transmission rod 7.

[0061] like Figures 18-20 As shown, the dustproof and waterproof module of this embodiment includes a top cover 2, a spring 3, and a spring torsion spring 4, which are responsible for preventing dust and rainwater from entering the lock cylinder. The top cover 2 is a circular shell including a top cover arc-shaped step 2.3, with a top cover hole 2.1 in the middle. The side length of the top cover hole 2.1 is slightly larger than the width of the key. The top cover arc-shaped step 2.3 has two top cover grooves 2.2. The spring 3 is a rectangular sheet with two spring sheet square protrusions 3.1 on both sides of one long side. After assembly, one end of the spring torsion spring 4 is inserted into the rotor groove 5.7 at the upper end of the rotor 5, and the other end abuts against the spring 3. The square protrusions 3.1 on both sides of the long side of the spring 3 are located in the rotor groove 5.7. The spring 3 can rotate around the square protrusions 3.1 on both sides of the long side in the rotor groove 5.7. At the same time, under the action of the spring torsion spring 4, it only sticks to the upper cover 2. The lower surface of the upper cover 2 sticks to the upper end face of the rotor 5, and the upper surface sticks to the inner step surface of the upper end of the housing 1 to achieve axial limitation. The upper cover groove 2.2 on the side of the upper cover 2 and the rectangular protrusion feature on the upper end of the rotor 5 cooperate to achieve circumferential limitation.

[0062] In this embodiment, during operation, when the key is inserted, the spring 3 rotates under the pushing action of the key, opening the rectangular hole and thus not affecting the insertion and removal of the key; after the key is removed, the spring 3, under the action of the spring torsion spring 4, returns to its fit with the lower surface of the housing 1 and blocks the upper cover hole in the middle of the housing 1, preventing dust from entering the lock cylinder from the keyhole, thus playing a dustproof role. At the same time, it can also cover the internal structure of the lock cylinder, playing an aesthetic role.

[0063] The above-described invention merely illustrates implementation methods of the present invention and should not be construed as limiting the scope of the invention patent, nor as imposing any form of limitation on the structure of the embodiments of the present invention. It should be noted that those skilled in the art can make various changes and improvements without departing from the concept of the embodiments of the present invention, and these all fall within the protection scope of the embodiments of the present invention.

Claims

1. An anti-theft structure for a car lock cylinder, characterized in that: Includes a rotor (5) disposed inside the housing (1), one end of the rotor (5) is provided with a top cover (2), the other end of the rotor (5) is hinged to a transmission rod (7), the end of the transmission rod (7) is used to connect and lock with a door lock (17), and a rotor protection module is provided on the rotor (5) to prevent the rotor (5) from rotating around the housing (1), and the rotor protection module is disposed between the housing (1) and the spring group (14); A transmission rod protection module is sleeved on the transmission rod (7). The transmission rod protection module is used to make the transmission rod protection module rotate when the external clamping device clamps the transmission rod protection module, so that the transmission rod (7) does not rotate. The transmission rod protection module includes a hollow protective shell structure (8) and a sleeve (9) that is interference-fitted with the protective shell structure (8). The sleeve (9) can be assembled from one end of the transmission rod (7). The outer surface of the protective shell structure (8) is provided with an outer surface circumferential rib (8.4) that restricts the axial movement of the sleeve (9). The protective shell structure (8) includes multiple protective shells that are mated to each other, and multiple sets of mating concave and convex structures are respectively provided on the mating surfaces of the upper and lower protective shells. The sleeve (9) is made of stainless steel, and the protective shell is made of polyoxymethylene.

2. The anti-theft structure for a car lock cylinder according to claim 1, characterized in that: Each reed in the reed group (14) is provided with a reed groove (14.3) that cooperates with the rotor protection module.

3. The anti-theft structure for a car lock cylinder according to claim 2, characterized in that: The housing (1) has a spring limiting groove (1.2) for inserting a single spring and a locking block limiting groove (1.3) for inserting the end of the rotor protection module.

4. The anti-theft structure for a car lock cylinder according to claim 3, characterized in that: The rotor protection module includes a locking block (11), the locking block (11) includes a locking block snap-fit ​​part (11.2) that cooperates with the locking block limiting groove part (1.3), and a locking block connecting part (11.1) that is adapted to the spring plate groove part (14.3) is provided below the locking block (11).

5. The anti-theft structure for a car lock cylinder according to claim 4, characterized in that: The height at which the locking block engaging portion (11.2) engages with the locking block limiting groove portion (1.3) is less than the height at which the locking block connecting portion (11.1) engages with the spring plate groove portion (14.3).

6. The anti-theft structure for a car lock cylinder according to claim 5, characterized in that: The locking block (11) is also provided with a locking block spring mechanism, which is used to make the locking block (11) leave the locking block limiting groove (1.3) and enter the spring groove (14.3).

7. The anti-theft structure for a car lock cylinder according to claim 6, characterized in that: The locking block spring mechanism includes locking block blind holes (11.3) located on both sides of the locking block (11). A locking block spring (12) in a compressed state is placed in the locking block blind hole (11.3). A cover plate (10) for restricting the movement of the locking block spring (12) is fixedly provided above the locking block spring (12). The end of the cover plate (10) is provided on the rotor (5).

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