A transmission structure and a lock that can prevent the motor from stalling

Abstract

The present invention discloses a transmission structure and a lock that can prevent the motor from being blocked. It includes a bottom case, on which a motor is provided. A motor gear is provided on the motor shaft of the motor. A clutch shaft is inserted into the bottom case. A driven gear and a transmission gear are respectively rotatably installed on the clutch shaft. The driven gear can mesh with the motor gear. A clutch mechanism is provided between the driven gear and the transmission gear, which can connect and disengage the driven gear and the transmission gear. The clutch mechanism includes a cylinder provided at the lower end of the driven gear and sleeved outside the clutch shaft. A clutch sleeve that can move up and down is provided inside the cylinder. A V-shaped notch is provided at the lower end of the clutch sleeve. Through the design of the V-shaped notch and the wedge-shaped boss, the V-shaped notch will move upward along the wedge-shaped boss, realizing the separation of the driven gear and the transmission gear. At this time, the motor is in an idling state, avoiding the occurrence of the situation where the motor is overloaded and burned out.

Description

Technical Field

[0001] The present invention relates to the field of locks, and particularly to a transmission structure capable of preventing motor stalling and a lock using the same. Background Art

[0002] Currently, in smart locks, the general method is that the motor drives the reducer to be directly connected to the lock tongue mechanism for transmission. There is no use of a clutch mechanism yet. The main reason is that the space inside the lock is limited and such a structure cannot be arranged. The biggest drawback of this hard connection transmission method is that there is no buffer structure between the motor and the lock tongue mechanism. Since the power of the motor itself is limited, when the resistance received by the lock tongue mechanism is too large and exceeds the bearing capacity of the motor, the motor will be in an overload state. If it is in the overload state for a long time or multiple times, the motor will be overloaded and burned out, resulting in the loss of the lock function or even scrapping. This is also one of the main problems that have long troubled the smart lock industry. Summary of the Invention

[0003] The present invention provides a transmission structure capable of preventing motor stalling and a lock using the same, avoiding the occurrence of motor overload and burnout.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A transmission structure capable of preventing motor stalling includes a bottom case. A motor is provided on the bottom case. A motor gear is provided on the motor shaft of the motor. A clutch shaft is inserted into the bottom case. A driven gear and a transmission gear are rotatably installed on the clutch shaft respectively. The driven gear can be meshed with the motor gear. A clutch mechanism capable of connecting and disengaging the driven gear and the transmission gear is provided between the driven gear and the transmission gear. The clutch mechanism includes a cylinder provided at the lower end of the driven gear and sleeved outside the clutch shaft. A clutch sleeve capable of moving up and down is provided inside the cylinder. A V-shaped notch is provided at the lower end of the clutch sleeve. A wedge-shaped boss capable of cooperating with the V-shaped notch is provided at the upper end of the transmission gear. A step plate is provided on the clutch shaft inside the cylinder. An elastic member capable of keeping the V-shaped notch and the wedge-shaped boss meshed is connected between the step plate and the clutch sleeve. According to such a structure, in the normal state, the driven gear drives the transmission gear to rotate through the meshing of the V-shaped notch and the wedge-shaped boss. When the resistance of the transmission gear reaches a certain level and the driven gear is still rotating, due to the design of the V-shaped notch and the wedge-shaped boss, the V-shaped notch will move upward along the wedge-shaped boss, realizing the separation of the driven gear and the transmission gear. At this time, the motor is in an idle state, avoiding the occurrence of motor overload and burnout.

[0006] Preferably, the number of both the V-shaped notch and the wedge-shaped boss is two. The two V-shaped notches and the two wedge-shaped bosses are symmetrically arranged and can cooperate with each other.

[0007] Preferably, vertical sliding grooves are symmetrically arranged inside the cylinder, and guide blocks are symmetrically arranged on the clutch sleeve. The guide blocks are movably arranged in the vertical sliding grooves.

[0008] Preferably, the elastic member is a spring, and the spring is sleeved on the clutch shaft.

[0009] A lock includes a lock case, a driving mechanism, a transmission mechanism, and a lock tongue mechanism. The driving mechanism includes a motor arranged inside the lock case. A motor gear is arranged on the motor shaft of the motor. A clutch shaft is inserted into the lock case. A driven gear and a transmission gear are respectively rotatably mounted on the clutch shaft. The driven gear can be meshed with the motor gear. A clutch mechanism capable of connecting and disengaging the driven gear and the transmission gear is arranged between the driven gear and the transmission gear. The clutch mechanism includes a cylinder arranged at the lower end of the driven gear and sleeved outside the clutch shaft. An axially movable clutch sleeve is arranged inside the cylinder. A V-shaped notch is arranged at the lower end of the clutch sleeve. A wedge-shaped boss capable of cooperating with the V-shaped notch is arranged at the upper end of the transmission gear. A step plate is arranged on the clutch shaft inside the cylinder. An elastic member capable of keeping the V-shaped notch and the wedge-shaped boss meshed is connected between the step plate and the clutch sleeve. The transmission mechanism includes a rotating plate rotatably mounted inside the lock case. A first sector gear and a second sector gear are respectively arranged on the rotating plate. The first sector gear can be meshed with the transmission gear. The lock tongue mechanism includes a lock tongue plate capable of sliding horizontally. A lock tongue is arranged at one end of the lock tongue plate. An opening arm is rotatably mounted inside the lock case. The opening arm swings to drive the lock tongue to extend out of or retract into the lock case. A third sector gear is arranged on the opening arm. The second sector gear can be meshed with the third sector gear. With such a structure, through a clever transmission and clutch design, the internal space of the lock body is reasonably occupied. Moreover, a gear transmission method is adopted, achieving a large transmission ratio, which is much larger than that of common current lock bodies. Under the same load condition, the torque required to be output by the motor is greatly reduced, so that a motor with a smaller power can be adopted, thereby greatly reducing the power consumption of the whole lock.

[0010] Further, a guide cylinder is arranged on the opening arm, and an inclined sliding groove is arranged on the lock tongue plate. The guide cylinder is movably arranged in the inclined sliding groove.

[0011] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0012] The transmission structure and lock device of the present invention can prevent the motor from being blocked. Compared with the prior art, the characteristics are novel design and simple structure. A unique transmission clutch mechanism is adopted between the motor and the lock tongue mechanism to achieve the purpose of flexible transmission. The greatest advantage of this structure is that when the resistance of the lock tongue mechanism reaches a certain level, the clutch mechanism will open to separate the motor transmission mechanism from the lock tongue mechanism. At this time, the motor is in an idling state, thereby avoiding the occurrence of motor overload and burning. The internal space of the lock body is reasonably occupied, and a gear transmission method is adopted to achieve a larger transmission ratio, which is far greater than the transmission ratio of the current common lock bodies. Under the same load condition, the torque required to be output by the motor is greatly reduced, so that a motor with lower power can be used, thereby greatly reducing the power consumption of the entire lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the decomposition of the present invention.

[0015] Figure 3 It is a partial anatomical schematic diagram of the present invention.

[0016] Figure 4 It is a schematic diagram of the top structure of the present invention.

[0017] Description of reference numerals:

[0018] 1. bottom shell; 2. motor; 3. motor gear; 4. clutch shaft; 5. driven gear; 6. transmission gear; 7. cylinder; 8. clutch sleeve; 9. V-shaped notch; 10. wedge-shaped boss; 11. step plate; 12. elastic member; 31. vertical slide groove; 32. guide block; 51. lock shell; 52. drive mechanism; 53. transmission mechanism; 54. lock tongue mechanism; 55. rotating plate; 56. first sector-shaped tooth; 57. second sector-shaped tooth; 58. lock tongue plate; 59. lock tongue; 501. opening arm; 502. third sector-shaped tooth; 61. guide cylinder; 62. oblique slide groove. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0020] like Figures 1 to 4The described transmission structure capable of preventing motor jamming has the following specific implementation manners: It includes a bottom case 1, on which a motor 2 is provided. On the motor shaft of the motor 2, a motor gear 3 is provided. A clutch shaft 4 is inserted into the bottom case 1. A driven gear 5 and a transmission gear 6 are rotatably mounted on the clutch shaft 4 respectively. The driven gear 5 can mesh with the motor gear 3. A clutch mechanism capable of connecting and disengaging the driven gear 5 and the transmission gear 6 is provided between the driven gear 5 and the transmission gear 6. The clutch mechanism includes a cylinder 7 provided at the lower end of the driven gear 5 and sleeved outside the clutch shaft 4. Inside the cylinder 7, a clutch sleeve 8 capable of moving up and down is provided. At the lower end of the clutch sleeve 8, a V-shaped notch 9 is provided. At the upper end of the transmission gear 6, a wedge-shaped boss 10 capable of cooperating with the V-shaped notch 9 is provided. On the clutch shaft 4 inside the cylinder 7, a stepped plate 11 is provided. An elastic member 12 capable of keeping the V-shaped notch 9 and the wedge-shaped boss 10 engaged is connected between the stepped plate 11 and the clutch sleeve 8. The elastic member 12 is a spring, and the spring is sleeved on the clutch shaft 4. A wedge-shaped structure is used for the cooperation between the transmission gear 6 and the clutch sleeve 8. The inclined surface of the V-shaped notch 9 in the clutch sleeve 8 contacts the inclined surface of the wedge-shaped boss 10 in the transmission gear 6. When the driven gear 5 drives the clutch sleeve 8 to rotate, due to the existence of the inclined surface, the clutch sleeve 8 has a tendency to move upward along the inclined surface. And the spring provided at the upper end of the clutch sleeve 8 presses the clutch sleeve 8. Under normal circumstances, the externally applied resistance on the transmission gear 6 is not sufficient to overcome the pressure of the spring on the clutch sleeve 8 to make it move upward. Therefore, the wedge-shaped structures of the clutch sleeve 8 and the transmission gear 6 are buckled together, so that the two are combined and will not come apart, that is, the clutch mechanism is closed. In this way, the transmission gear 6 and the driven gear 5 rotate synchronously. When the externally applied resistance on the transmission gear 6 is large enough, the force applied to the clutch sleeve 8 along the inclined surface upward exceeds the pressure applied by the spring to the clutch sleeve 8. The clutch sleeve 8 will move upward along the inclined surface until it is completely disengaged from the transmission gear 6. At this time, the clutch sleeve 8 and the driven gear 5 can rotate freely together, and the motor 2 driving them to rotate is in an idling state. Therefore, it can prevent the motor 2 from being overloaded and burned out, playing a protective function. When the motor 2 idles for a certain number of turns, it will still stop rotating. At this time, the clutch sleeve 8 and the transmission gear 6 still remain disengaged, and the transmission gear 6 also remains in its original state without externally applied actions. When the external obstacle is removed and the unlocking or locking action is performed again, the motor 2 is re-energized and continues to rotate (that is, both forward and reverse rotations are possible). After the clutch sleeve 8 rotates until its V-shaped notch 9 is aligned with the wedge-shaped boss 10 of the transmission gear 6, it automatically pops into the transmission gear 6 under the pressure of the spring. The wedge-shaped structures are buckled, and the clutch sleeve 8 is connected to the transmission gear 6 and rotates synchronously, restoring the normal function.

[0021] Specifically, the number of both the V-shaped notch 9 and the wedge-shaped boss 10 is two. The two V-shaped notches 9 and the two wedge-shaped bosses 10 are symmetrically arranged and can cooperate with each other.

[0022] Specifically, vertical sliding grooves 31 are symmetrically arranged inside the cylinder 7, and guide blocks 32 are symmetrically arranged on the clutch sleeve 8. The guide blocks 32 are movably arranged in the vertical sliding grooves 31, enabling the clutch sleeve 8 to move up and down along the vertical sliding grooves 31. At the same time, the rotation of the driven gear 5 drives the clutch sleeve 8 to rotate together.

[0023] A lock has the following specific implementation manner: It includes a lock case 51, a driving mechanism 52, a transmission mechanism 53 and a lock tongue mechanism 54. The driving mechanism 52 includes a motor 2 arranged inside the lock case 51. A motor gear 3 is arranged on the motor shaft of the motor 2. A clutch shaft 4 is inserted into the lock case 51. A driven gear 5 and a transmission gear 6 are respectively rotatably installed on the clutch shaft 4. The driven gear 5 can be meshed with the motor gear 3. A clutch mechanism capable of connecting and disengaging the driven gear 5 and the transmission gear 6 is arranged between the driven gear 5 and the transmission gear 6. The clutch mechanism includes a cylinder 7 arranged at the lower end of the driven gear 5 and sleeved outside the clutch shaft 4. An axially movable clutch sleeve 8 is arranged inside the cylinder 7. A V-shaped notch 9 is arranged at the lower end of the clutch sleeve 8. A wedge-shaped boss 10 capable of cooperating with the V-shaped notch 9 is arranged at the upper end of the transmission gear 6. A stepped plate 11 is arranged on the clutch shaft 4 inside the cylinder 7. An elastic member 12 capable of keeping the V-shaped notch 9 and the wedge-shaped boss 10 engaged is connected between the stepped plate 11 and the clutch sleeve 8. The transmission mechanism 53 includes a rotating plate 55 rotatably installed inside the lock case 51. A first sector gear 56 and a second sector gear 57 are respectively arranged on the rotating plate 55. The first sector gear 56 can be meshed with the transmission gear 6. The lock tongue mechanism 54 includes a lock tongue plate 58 capable of sliding horizontally. A lock tongue 59 is arranged at one end of the lock tongue plate 58. An opening arm 501 is rotatably installed inside the lock case 51. The opening arm 501 swings to drive the lock tongue 59 to extend out of or retract into the lock case 51. A third sector gear 502 is arranged on the opening arm 501. The second sector gear 57 can be meshed with the third sector gear 502. A guide cylinder 61 is arranged on the opening arm 501. An inclined sliding groove 62 is arranged on the lock tongue plate 58. The guide cylinder 61 is movably arranged in the inclined sliding groove 62.

[0024] Locking process of the locking tongue 59: The lock is in the open state. At this time, the door closing operation is performed. When the door body completely enters the door frame, the cross-tongue mechanism will give a door closing signal (the cross-tongue mechanism is a prior art). After the electronic system receives this signal, it will give a power-on signal to the motor 2, and the motor 2 starts. The motor gear 3 rotates and drives the driven gear 5 to rotate. Under normal circumstances, the resistance exerted on the transmission gear 6 by the transmission mechanism 53 and the locking tongue mechanism 54 is not enough to overcome the pressure of the spring in the clutch mechanism on the clutch sleeve 8. The clutch sleeve 8 and the wedge-shaped structure of the transmission gear 6 are engaged together, and the two will not disengage when combined, that is, the clutch mechanism is closed. In this way, the transmission gear 6 rotates synchronously with the driven gear 5. The transmission gear 6 meshes with the first sector gear 56 to drive the rotating piece 55 to rotate. The second sector gear 57 of the rotating piece 55 meshes with the third sector gear 502, so as to drive the opening arm 501 to rotate. The opening arm 501 drives the guide cylinder 61 to swing. Through the setting of the inclined chute 62, the locking tongue plate 58 drives the locking tongue 59 to extend outwards. When the locking tongue plate 58 reaches the maximum position, that is, the locked state, the locking tongue mechanism 54 gives a locking signal. After the electronic system receives this signal, it gives a power-off signal to the motor 2, and the motor 2 stops rotating and remains in the power-off state, completing the locking process.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission structure capable of preventing the motor from being blocked, Characterized in that: It includes a bottom shell (1), on which a motor (2) is provided. On the motor shaft of the motor (2), a motor gear (3) is provided. A clutch shaft (4) is inserted on the bottom shell (1). A driven gear (5) and a transmission gear (6) are respectively rotatably installed on the clutch shaft (4). The driven gear (5) can be meshed with the motor gear (3). A clutch mechanism capable of connecting and disengaging the driven gear (5) and the transmission gear (6) is provided between the driven gear (5) and the transmission gear (6). The clutch mechanism includes a cylinder (7) provided at the lower end of the driven gear (5) and sleeved outside the clutch shaft (4). A clutch sleeve (8) capable of moving up and down is provided in the cylinder (7). A V-shaped notch (9) is provided at the lower end of the clutch sleeve (8). A wedge-shaped boss (10) capable of cooperating with the V-shaped notch (9) is provided at the upper end of the transmission gear (6). A stepped plate (11) is provided on the clutch shaft (4) inside the cylinder (7). An elastic member (12) capable of keeping the V-shaped notch (9) and the wedge-shaped boss (10) engaged is connected between the stepped plate (11) and the clutch sleeve (8). The number of the V-shaped notches (9) and the wedge-shaped bosses (10) is two each. The two V-shaped notches (9) and the two wedge-shaped bosses (10) are symmetrically arranged and can cooperate with each other. Vertically sliding grooves (31) are symmetrically provided in the cylinder (7). Guide blocks (32) are symmetrically provided on the clutch sleeve (8). The guide blocks (32) are movably arranged in the vertically sliding grooves (31). The elastic member (12) is a spring. The spring is sleeved on the clutch shaft (4).

2. A lock, Characterized in that: It includes a lock case (51), a driving mechanism (52), a transmission mechanism (53) and a locking tongue mechanism (54). The driving mechanism (52) includes a motor (2) arranged in the lock case (51). A motor gear (3) is provided on the motor shaft of the motor (2). A clutch shaft (4) is inserted into the lock case (51). A driven gear (5) and a transmission gear (6) are respectively rotatably mounted on the clutch shaft (4). The driven gear (5) can be meshed with the motor gear (3). A clutch mechanism capable of connecting and disengaging the driven gear (5) and the transmission gear (6) is provided between the driven gear (5) and the transmission gear (6). The clutch mechanism includes a cylinder (7) arranged at the lower end of the driven gear (5) and sleeved outside the clutch shaft (4). Vertical sliding grooves (31) are symmetrically arranged in the cylinder (7). A clutch sleeve (8) capable of moving up and down is arranged in the cylinder (7). Guide blocks (32) are symmetrically arranged on the clutch sleeve (8). The guide blocks (32) are movably arranged in the vertical sliding grooves (31). A V-shaped notch (9) is arranged at the lower end of the clutch sleeve (8). A wedge-shaped boss (10) capable of cooperating with the V-shaped notch (9) is arranged at the upper end of the transmission gear (6). A step plate (11) is arranged on the clutch shaft (4) inside the cylinder (7). An elastic member (12) capable of keeping the V-shaped notch (9) and the wedge-shaped boss (10) engaged is connected between the step plate (11) and the clutch sleeve (8). The transmission mechanism (53) includes a rotating plate (55) rotatably mounted in the lock case (51). A first sector gear (56) and a second sector gear (57) are respectively arranged on the rotating plate (55). The first sector gear (56) can be meshed with the transmission gear (6). The locking tongue mechanism (54) includes a locking tongue plate (58) capable of sliding horizontally. A locking tongue (59) is arranged at one end of the locking tongue plate (58). An opening arm (501) is rotatably mounted in the lock case (51). The opening arm (501) swings to drive the locking tongue (59) to extend out of or retract into the lock case (51). A third sector gear (502) is arranged on the opening arm (501). The second sector gear (57) can be meshed with the third sector gear (502).

3. A lock according to claim 2, characterized in that a guide cylinder (61) is arranged on the opening arm (501), and an inclined sliding groove (62) is arranged on the locking tongue plate (58). The guide cylinder (61) is movably arranged in the inclined sliding groove (62).

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