Anti-theft car door lock cylinder with two-stage mechanical transmission

Abstract

The utility model provides an anti-theft car door lock cylinder with two-stage mechanical transmission, which relates to the technical field of anti-theft car door lock cylinders and comprises a lock cylinder, a lock sleeve, an inner lock sleeve, a drive plate and a connecting plate gear are sequentially sleeved on the lock cylinder, the connecting plate gear is meshed with one end of a transmission gear, and the other end of the transmission gear is meshed with a flexible shaft connecting gear. The flexible shaft connecting gear is connected with one end of the flexible shaft core, and a flat connector is arranged at the other end of the flexible shaft core and connected with the lock body structure. The transmission direction and the transmission mode of the lock cylinder are changed, compared with a traditional lock cylinder structure, the installation space is saved, and the anti-theft performance is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-theft vehicle door lock cores, in particular to an anti-theft vehicle door lock core with two-level mechanical transmission. Background Art

[0002] The demand for car anti-theft systems is increasing day by day, and the requirements are not only for the advanced technology, but also for its reliability and practicality. The application of traditional pull rod transmission structure in the field of car anti-theft is subject to certain restrictions. Its security protection space is relatively narrow, and it is difficult to deal with complex and changeable theft methods. In addition, due to its complex structure, it not only brings additional difficulties to production, but also adds unnecessary troubles in repair and maintenance. In order to meet higher anti-theft needs, the pull rod transmission structure needs to be improved and upgraded.

[0003] The invention with publication number CN103388431B discloses a car door lock that is resistant to violent twisting, which includes a lock cover, a lock shell, a lock core, a lock sleeve, a separator, a clutch sleeve, a torsion spring, a transmission rotor and a transmission rod from the outside to the inside. From the technical characteristics, the car door lock is provided with a corresponding matching inter-rotation separation structure on the separator and the lock shell respectively. The separator will move axially relative to the lock shell during the process of being driven to rotate, thereby pushing the clutch sleeve to disconnect the transmission force of the lock core, so that the lock core is idle. In the public document, the clutch sleeve is pushed to disconnect the transmission of the lock core by setting a separator, thereby protecting the lock core from being violently twisted. However, the lock core structure in the public document cannot solve the problem that the structure extends in the depth direction and occupies too much use space, and cannot adapt to the use of small spaces. In addition, the public document only solves the problem of preventing the lock core from violent twisting, and does not solve the need for anti-theft. Utility Model Content

[0004] The utility model provides an anti-theft vehicle door lock core with two-stage mechanical transmission, aiming at least to solve a technical problem existing in the prior art mentioned in the background technology.

[0005] The utility model provides the following technical solutions to achieve the above objectives:

[0006] The utility model discloses an anti-theft vehicle door lock core with a two-stage mechanical transmission, comprising a lock core, an inner lock sleeve being provided on the lock core, a lock sleeve being provided on the outer side of the inner lock sleeve, a dial being provided on the upper part of the inner lock sleeve, the dial being connected to a connecting plate gear, the connecting plate gear being meshed with one end of a transmission gear, the other end of the transmission gear being meshed with a flexible shaft connecting gear, the flexible shaft connecting gear being connected to one end of a flexible shaft core, and the flexible shaft core being connected to a lock body.

[0007] Furthermore, at least one boss structure is provided on the lock core, and a corresponding groove is provided on the dial to match the boss structure of the lock core.

[0008] Furthermore, a beveled boss is provided on the contact surface between the inner locking sleeve and the locking sleeve, and a corresponding beveled groove on the locking sleeve matches the beveled boss of the inner locking sleeve.

[0009] Furthermore, at least one transmission column is provided on the dial, and a corresponding groove is provided on the connecting plate gear to match the boss structure of the dial; a compression torsion spring is provided between the dial and the connecting plate gear, an open retaining ring is provided on the end surface of the connecting plate gear away from the dial, and two limiting straight line segments are provided on the compression torsion spring.

[0010] Furthermore, one side of the transmission gear is end face gear and the other side is spur gear, the end face gear meshes with the flexible shaft connecting gear, and the spur gear meshes with the connecting plate gear. A lower cover is arranged below the transmission gear, and a center hole is opened on the lower cover and the lower cover is mounted on the positioning column of the upper cover through the center hole.

[0011] Furthermore, an upper cover is arranged above the meshing surface of the transmission gear and the flexible shaft connecting gear, a positioning column is arranged on the upper cover, the transmission gear is sleeved on the positioning column of the upper cover, cylindrical boss shafts are arranged at both ends of the flexible shaft connecting gear, and the cylindrical boss shaft at one end of the flexible shaft connecting gear is matched and placed in the circular groove of the upper cover; a lower cover is arranged below the meshing surface of the transmission gear and the connecting plate gear, a center hole is opened on the lower cover and is matched and installed on the positioning column of the upper cover through the center hole, and the cylindrical boss shaft at the other end of the flexible shaft connecting gear is matched and placed in the circular groove formed by matching the upper cover and the lower cover.

[0012] Furthermore, a limiting boss is arranged on the edge of the connecting plate gear, and a corresponding groove is arranged on the locking sleeve to match the limiting boss of the connecting plate gear.

[0013] Furthermore, the flexible shaft core is connected to the flat joint, and the flat joint is connected to the lock body.

[0014] Furthermore, the lock core is provided with eight lock plate slots and one anti-pry lock plate slot, a lock plate is provided in the lock plate slot, a lock plate spring is provided on the lock plate; and an anti-pry lock plate is provided in the anti-pry lock plate slot.

[0015] Beneficial Effects

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model changes the transmission direction of the lock core by cooperating with the transmission gear and the flexible shaft connecting gear, so that the overall structure of the entire anti-theft car door lock core is transformed from a depth structure to a broken line structure, saving the occupied area in the depth space, and is more suitable for use in narrow areas such as inside the car door; at the same time, the utility model adopts a flexible shaft core as a transmission structure. Compared with the traditional pull rod transmission method, the use of the flexible shaft core can not only complete the transmission function in an irregular space, thereby reducing the demand for installation space of the lock body structure, but also does not need to set an additional protective structure outside the flexible shaft core, effectively saving production costs. In addition, due to the material properties of the flexible shaft core itself, it adopts a rotation method for transmission. Compared with the rod transmission method, it can effectively prevent foreign objects from forcing the lock body to open by toggling the rod. In a limited space such as a car door, the flexible shaft core is more difficult to be invaded by foreign objects and forced to rotate to open the lock body, thereby significantly enhancing the anti-theft performance of the car door lock.

[0018] 2. The utility model provides correspondingly matched bosses and grooves on the lock core and the dial, and when the two are engaged, rotating the lock core can drive the dial to rotate, thereby realizing step-by-step transmission.

[0019] 3. The utility model provides a lock sleeve, an inner lock sleeve and a dial to cooperate with each other, thereby protecting the lock core structure and preventing the lock core from being damaged by violent prying or a non-original key being inserted to try to unlock the lock, causing the transmission structure to be damaged.

[0020] 4. The utility model realizes the transmission work from the lock core to the dial to the connecting plate gear by arranging a transmission column on the dial to cooperate with the groove on the connecting plate gear; the automatic resetting of the dial is realized by arranging a compression torsion spring between the dial and the connecting plate gear, and an open retaining ring is arranged on the connecting plate gear to prevent the compression torsion spring from ejecting the connecting plate gear and causing failure of the lock core.

[0021] 5. The utility model realizes the change of transmission direction by setting the transmission gear with end face teeth on one side and straight teeth on the other side.

[0022] 6. The utility model provides protection for the connecting plate gear, the transmission gear and the flexible shaft connecting gear by arranging the upper cover and the lower cover, and provides working space for the transmission gear and the flexible shaft connecting gear, thereby ensuring that the transmission gear and the flexible shaft connecting gear are always in a meshing state.

[0023] 7. The utility model can ensure that the connecting plate gear and the transmission gear are always in a meshing state by arranging a limited position boss on the connecting plate gear and cooperating with the groove of the locking sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0025] Figure 1 It is the structural explosion diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the lock core of the utility model;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the lock core of the utility model;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the lock sleeve and the inner lock sleeve of the utility model;

[0029] Figure 5 This is a cross-sectional schematic diagram of the installation structure of the lock core, lock sleeve, inner lock sleeve, compression torsion spring and connecting plate gear of the utility model;

[0030] Figure 6 This is a schematic diagram of the installation structure of the compression torsion spring of the utility model;

[0031] Figure 7 This is a top view of the connecting plate gear, dial and lock sleeve structure of the utility model;

[0032] Figure 8 This is a schematic diagram of the axial view of the connecting plate gear, dial and lock sleeve structure of the utility model;

[0033] Fig. 9 It is a schematic diagram of the structure section of the upper cover, lower cover, connecting plate gear and transmission gear of the utility model;

[0034] Fig.10 This is a cross-sectional schematic diagram of the connection structure of the upper cover, the lower cover, the transmission gear and the flexible shaft connecting gear of the utility model;

[0035] Fig.11 This is a schematic diagram of the structure of the transmission gear of the utility model;

[0036] Fig.12 It is a schematic diagram of the meshing relationship between the connecting plate gear, the transmission gear and the flexible shaft connecting gear of the utility model;

[0037] Fig.13 This is a structural schematic diagram of the flexible shaft connecting gear, flexible shaft core, flat joint and lock body of the utility model;

[0038] Fig.14This is a schematic diagram of the overall structure of the anti-theft door lock cylinder of the utility model;

[0039] Figure numerals: 1—mechanical key; 2—lock core; 3—lock plate spring; 4—lock plate; 5—anti-pry lock plate; 6—lock sleeve; 7—inner lock sleeve; 8—dial; 9—torsion spring; 10—connecting plate gear; 11—opening retaining ring; 12—lower cover; 13—screw; 14—transmission gear; 15—flexible shaft connecting gear; 16—upper cover; 17—flexible shaft core; 18—flat joint; 19—lock body. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention.

[0041] It should be noted that in the present invention: the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or apparatuses; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These The terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation; the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "install", "set", "provided with", "connected", "connected", "sleeved", etc. should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. In addition, some terms can be used to express other meanings in addition to indicating orientation or positional relationships. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For ordinary technicians in this field, the specific meanings of these terms in the utility model can be understood according to specific circumstances.

[0042] Embodiment. An anti-theft door lock cylinder with two-stage mechanical transmission, the structure of which is referenced Figures 1 to 14, including a lock core 2, an inner lock sleeve 7 is sleeved on the lock core 2, a lock sleeve 6 is arranged on the outer side of the inner lock sleeve 7, a dial 8 is arranged on the upper part of the inner lock sleeve 7, the dial 8 is connected to the connecting plate gear 10, the connecting plate gear 10 is meshed with one end of the transmission gear 14, the other end of the transmission gear 14 is meshed with the flexible shaft connecting gear 15, the rotating shaft setting direction of the transmission gear 14 is perpendicular to the rotating shaft setting direction of the flexible shaft connecting gear 15; the flexible shaft connecting gear 15 is connected to one end of the flexible shaft core 17, the other end of the flexible shaft core 17 is provided with a flat joint 18, and the flat joint 18 is inserted into the lock body 19. By setting the rotating shafts of the transmission gear and the flexible shaft connecting gear perpendicular to each other to change the transmission direction of the lock core, the overall structure of the entire anti-theft car door lock core is changed from a depth structure to a broken line structure, saving the occupied area in the depth space, and more suitable for use in narrow areas such as inside the car door; at the same time, the utility model adopts a flexible shaft core as a transmission structure. Compared with the traditional pull rod transmission method, the use of the flexible shaft core can not only complete the transmission function in an irregular space, thereby reducing the demand for installation space of the lock body structure, but also does not need to set an additional protective structure outside the flexible shaft core, effectively saving production costs. In addition, due to the material properties of the flexible shaft core itself, it adopts a rotation method for transmission. Compared with the rod transmission method, it can effectively prevent foreign objects from forcing the lock body to open by toggling the rod. In a limited space such as a car door, the flexible shaft core is more difficult to be invaded by foreign objects and forced to rotate to open the lock body, thereby significantly enhancing the anti-theft performance of the car door lock.

[0043] At least one boss structure is provided on the lock core 2, and a corresponding groove is provided on the dial 8 to match the boss structure of the lock core 2. By providing corresponding matching bosses and grooves on the lock core 2 and the dial 8, when the two are engaged, rotating the lock core can drive the dial to rotate, thereby realizing step-by-step transmission.

[0044] The contact surface between the inner lock sleeve 7 and the lock sleeve 6 is provided with a beveled boss, and the corresponding beveled groove on the lock sleeve 6 matches the beveled boss of the inner lock sleeve 7. The beveled boss on the inner lock sleeve 7 is a convex structure arranged obliquely on the outer surface of the inner lock sleeve 7, and the beveled groove provided on the lock sleeve 6 is a groove provided on the inner surface of the lock sleeve 6 and arranged in alignment with the beveled boss of the inner lock sleeve 7. When a key 1 or other object not matching the lock plate 4 is inserted into the lock cylinder 2 and attempted to rotate and open the door lock, the raised portion of the lock plate 4 drives the inner lock sleeve 7 to rotate, and the inner lock sleeve 7 rotates upward along the beveled groove provided on the lock sleeve 6 to lift the dial 8, so that the dial 8 is separated from the lock cylinder 2, and the lock cylinder 2 is idle and cannot be unlocked at this time; by providing the beveled boss of the inner lock sleeve 7 and the beveled groove of the lock sleeve 6 to cooperate with each other, the integrity of the transmission structure can be protected when encountering a prying lock or other key 1.

[0045] At least one transmission column is arranged on the dial 8, and a corresponding groove is arranged on the connecting plate gear 10 to match the boss structure of the dial 8; a compression torsion spring 9 is arranged between the dial 8 and the connecting plate gear 10, and an open retaining ring 11 is arranged on the end surface of the connecting plate gear 10 away from the dial 8, and a limited straight line segment is arranged at the head and tail ends of the compression torsion spring 9, and the limited straight line segment of the compression torsion spring 9 is clamped on the transmission column of the dial 8. By arranging a transmission column on the dial 8 to cooperate with the groove on the connecting plate gear 10, the transmission work from the lock core to the dial and then to the connecting plate gear is realized; by arranging an open retaining ring 11 on the connecting plate gear 10, the compression spring 9 is prevented from popping out the connecting plate gear 10; by arranging limiting straight line sections at the head and tail ends of the compression spring 9, the compression spring 9 is pre-compressed and assembled when installed between the dial 8 and the connecting plate gear 10, so that the compression spring 9 is subjected to the pressure between the dial 8 and the connecting plate gear 10. When the lock core 2 idles, the dial 8 is automatically pushed back to its original position under the pressure of the compression spring 9. At the same time, when the lock core 2 is normally opened to the maximum unlocking angle, the lock core 2 can automatically rotate to its original position under the action of the rotational torque of the compression spring 9.

[0046] The transmission gear 14 has face teeth on one side and spur teeth on the other side. The face teeth mesh with the flexible shaft connecting gear 15, and the spur teeth mesh with the connecting plate gear 10. By arranging face teeth and spur teeth on the transmission gear 14, the transmission direction of the torque is changed. Compared with the simple spur gear structure in the prior art, the superposition of face teeth and spur teeth not only completes the change of transmission direction but also saves the space occupied by the lock core.

[0047] An upper cover 16 is arranged above the meshing surface of the transmission gear 14 and the flexible shaft connecting gear 15, and a positioning column is arranged on the upper cover 16. The transmission gear 14 is sleeved on the positioning column of the upper cover 16. Both ends of the flexible shaft connecting gear 15 are provided with cylindrical boss shafts, and one end of the cylindrical boss shaft of the flexible shaft connecting gear 15 is matched and placed in the circular groove of the upper cover 16; a lower cover 12 is arranged below the meshing surface of the transmission gear 14 and the connecting plate gear 10, and a center hole is opened on the lower cover 12 and matched and mounted on the positioning column of the upper cover 16 through the center hole, and the other end of the cylindrical boss shaft of the flexible shaft connecting gear 15 is matched and placed in the circular groove formed by matching the upper cover 16 and the lower cover 12. The upper cover 16 and the lower cover 12 are arranged to provide a working space for the transmission gear 14 and the flexible shaft connecting gear 15, and ensure that the transmission gear 14 and the flexible shaft connecting gear 15 are always in a meshing state.

[0048] The edge of the connecting plate gear 10 is provided with a limiting boss, and the lock sleeve 6 is provided with a corresponding groove that matches the limiting boss of the connecting plate gear 10. By providing the limiting boss on the connecting plate gear 10 to match the groove of the lock sleeve 6, the connecting plate gear 10 is prevented from sliding along the lock core 2 to ensure that the connecting plate gear 10 and the transmission gear 14 are always in a meshing state.

[0049] The flexible shaft core 17 is connected to the flat joint 18, and the flat joint 18 is connected to the lock body 19. The connection ends of the flexible shaft core 17, the flexible shaft connecting gear 15 and the flat joint 18 are set to be square. By setting the two connection sections of the flexible shaft core 17 to be square, the connection ends of the flexible shaft core 17, the flexible shaft connecting gear 15 and the flat joint 18 are riveted by punch riveting, the force transmission effect of the flexible shaft core 17 is improved, and at the same time, it is ensured that the flexible shaft core 17 will not slip when subjected to axial rotation torque.

[0050] The lock core 2 is provided with eight lock plate slots and one anti-pry lock plate slot, a lock plate 4 is provided in the lock plate slot, a lock plate spring 3 is provided on the lock plate 4; an anti-pry lock plate 5 is provided in the anti-pry lock plate slot; the lock plate 4 is provided with four different tooth numbers; the material thickness of the anti-pry lock plate 5 is 2mm and the hardness is greater than 50HRC; the anti-pry lock plate 5 is fixed in the anti-pry lock plate slot. By setting four different tooth numbers of lock plates 4 arranged and combined and installed in the lock plate slot of the lock core 2, only when the key 1 matching the lock plate 4 is inserted into the key slot of the lock core 2, all the lock plates 4 will not be higher than the outer circle of the lock core 2, and the restrictions on the surrounding structure will be removed, and the lock core 2 can rotate in the lock sleeve 6, thereby improving the anti-theft performance. The anti-pry lock plate 5 is made of a material with a thickness of 2mm and a hardness greater than 50HRC and is set in the anti-pry lock plate slot of the lock core 2 in the form of punching and riveting, which increases the strength of the lock core and improves the safety and reliability of the lock core 2.

[0051] The usage and working principle of the utility model: The utility model is mainly used as a door lock on the car door. The structure is referenced Fig.14 The lock sleeve 6 is fixed to the door handle base by screws 13. When in use, the original mechanical key 1 is inserted into the keyhole of the lock core 2. The lock pieces with different tooth numbers in the lock core 2 cooperate with the mechanical key 1. Under the action of the tooth shape of the mechanical key 1, all the matching lock pieces are retracted to their original positions and will not be higher than the outer circle of the lock core. At this time, the mechanical key 1 can rotate the lock core 2. The rotation of the lock core 2 drives the dial 8 to rotate through the boss, and the rotation of the dial 8 drives the connecting plate gear 10 to rotate through the three limit columns. The connecting plate gear 10 is meshed with the transmission gear 14, and the transmission gear 14 is meshed with the flexible shaft connecting gear 15. The connecting plate gear 10 drives the flexible shaft connecting gear 15 to rotate through the secondary gear transmission. The flexible shaft connecting gear 15 transmits the rotational motion and torque through the flexible shaft core 17. The flexible shaft core 17 is riveted on the flat joint 18 to realize the rotation of the flat joint 18. The lock body 19 is opened through the flat joint 18, and the door lock is finally opened.

[0052] Obviously, the above is only a part of the embodiments of the utility model, not all of the embodiments. The above embodiments are not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any combination, modification, equivalent replacement, improvement and all other embodiments that can be made by ordinary technicians in the field within the spirit and principle of the utility model should be within the protection scope of the utility model.

Claims

1. An anti-theft door lock cylinder with two-stage mechanical transmission, characterized in that: The invention comprises a lock core (2), an inner lock sleeve (7) is sleeved on the lock core (2), a lock sleeve (6) is arranged on the outer side of the inner lock sleeve (7), a dial (8) is arranged on the upper part of the inner lock sleeve (7), the dial (8) is connected to a connecting plate gear (10), the connecting plate gear (10) is meshed with one end of a transmission gear (14), the other end of the transmission gear (14) is meshed with a flexible shaft connecting gear (15), the flexible shaft connecting gear (15) is connected to one end of a flexible shaft core (17), and the flexible shaft core (17) is connected to a lock body (19).

2. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1 is characterized in that: At least one boss structure is provided on the lock core (2), and a corresponding groove is provided on the dial (8) to match the boss structure of the lock core (2).

3. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: A beveled boss is provided on the contact surface between the inner locking sleeve (7) and the locking sleeve (6), and a corresponding beveled groove on the locking sleeve (6) matches the beveled boss of the inner locking sleeve (7).

4. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: At least one transmission column is arranged on the dial (8), and a corresponding groove is arranged on the connecting plate gear (10) to match the boss structure of the dial (8); a compression torsion spring (9) is arranged between the dial (8) and the connecting plate gear (10), an open retaining ring (11) is arranged on the end surface of the connecting plate gear (10) away from the dial (8), and a limiting straight line segment is arranged at the head and tail ends of the compression torsion spring (9), and the limiting straight line segment of the compression torsion spring (9) is clamped on the transmission column of the dial (8).

5. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: One side of the transmission gear (14) is end face gear, and the other side is spur gear, the end face gear meshes with the flexible shaft connecting gear (15), and the spur gear meshes with the connecting plate gear (10).

6. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: An upper cover (16) is arranged above the meshing surface of the transmission gear (14) and the flexible shaft connecting gear (15), and a positioning column is arranged on the upper cover (16). The transmission gear (14) is sleeved on the positioning column of the upper cover (16). Both ends of the flexible shaft connecting gear (15) are provided with cylindrical boss shafts, and the cylindrical boss shaft at one end of the flexible shaft connecting gear (15) is matched and placed in the circular groove of the upper cover (16); a lower cover (12) is arranged below the meshing surface of the transmission gear (14) and the connecting plate gear (10), and a center hole is opened on the lower cover (12) and is matched and mounted on the positioning column of the upper cover (16) through the center hole, and the cylindrical boss shaft at the other end of the flexible shaft connecting gear (15) is matched and placed in the circular groove formed by matching the upper cover (16) and the lower cover (12).

7. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: A limiting boss is provided on the edge of the connecting plate gear (10), and a corresponding groove is provided on the locking sleeve (6) to match the limiting boss of the connecting plate gear (10).

8. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: The flexible shaft core (17) is connected to the flat joint (18), and the flat joint (18) is connected to the lock body (19).

9. The anti-theft door lock cylinder with two-stage mechanical transmission according to claim 1, characterized in that: The lock core (2) is provided with eight locking plate slots and one anti-pry locking plate slot, a locking plate (4) is provided in the locking plate slot, and a locking plate spring (3) is provided on the locking plate (4).

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