Helmet electronic lock for shared bicycle

Abstract

The utility model discloses a helmet electronic lock for a shared bicycle, and relates to the technical field of electronic locks, a spring bolt is rotatably mounted on a supporting shaft of a base, a driven bevel gear is rotatably mounted in a hollow shaft of the spring bolt, a torsional spring is hinged between the driven bevel gear and the spring bolt, and a lock catch meshed with the spring bolt is arranged on a helmet; the incomplete gear is rotationally installed in the base, the control module is fixedly installed in the base, the blocking piece rotationally installed on the control module is arranged in a trapezoidal groove of the incomplete gear, the blocking piece is in contact fit with the control module to control the rotating direction of an output shaft of the motor, and the motor changes the rotating direction of the incomplete gear through the speed changing assembly. And the incomplete gear changes the rotating direction of the driven bevel gear through the driving bevel gear to unlock the spring bolt. According to the helmet returning device, the returning speed of the helmet is increased, operation is easy, the helmet can be prevented from being lost, practicability is high, and structural matching is ingenious.

Description

Technical Field

[0001] This utility model relates to the field of electronic lock technology, and in particular to an electronic lock for a helmet used in shared bicycles. Background Technology

[0002] The government has issued regulations requiring riders of electric bicycles to wear helmets, making it mandatory to equip shared bicycles with helmets. For example, traffic police departments in many areas have intensified their efforts to crack down on riders not wearing helmets and have urged shared bicycle operators to implement helmet-equipping policies.

[0003] Traditional methods of storing helmets for shared bicycles, such as using fixed storage cabinets or connecting helmets with physical ropes, are inconvenient to use and prone to loss. Electronic locks rely on electricity and electronic components to operate, and their performance may be affected by inclement weather conditions. Moreover, existing helmet electronic locks are complicated to return, so there is an urgent need for a helmet electronic lock for shared bicycles. Utility Model Content

[0004] To address the aforementioned technical problems, the present invention adopts the following technical solution: an electronic lock for a shared bicycle helmet, comprising a support mechanism and an intermittent power mechanism. The support mechanism includes a base and a locking tongue. The locking tongue is rotatably mounted on a support shaft of the base. A lock cover is fixedly mounted on the base. A driven bevel gear is rotatably mounted inside the hollow shaft of the locking tongue. A torsion spring is hinged between the driven bevel gear and the locking tongue. A buckle that engages with the locking tongue is provided on the helmet. The intermittent power mechanism is located inside the base. The intermittent power mechanism includes an incomplete gear and a control module. The incomplete gear is rotatably mounted inside the base. The control module is fixedly mounted inside the base. A baffle plate rotatably mounted on the control module is located inside the trapezoidal groove of the incomplete gear. The baffle plate contacts and cooperates with the control module to control the rotation direction of the motor output shaft. A speed-changing component is provided between the motor and the incomplete gear. The motor changes the rotation direction of the incomplete gear through the speed-changing component. A main bevel gear is rotatably mounted above the base. The main bevel gear is fixedly mounted to the incomplete gear. The main bevel gear meshes with the driven bevel gear. The incomplete gear changes the rotation direction of the driven bevel gear through the main bevel gear to unlock the locking tongue.

[0005] Furthermore, the support mechanism also includes a base plate, which is fixedly installed to the bottom of the base and sealed between the base plate and the base. A sealing ring is provided at the rotating connection between the main bevel gear and the base. To cope with harsh environments, the base plate prevents water and other debris from entering the interior of the base and affecting the operation of the motor; the sealing ring separates the main bevel gear from the interior of the base, preventing water and other impurities from entering the interior of the base through the rotating connection between the main bevel gear and the base and affecting the operation of the motor.

[0006] Furthermore, a gear shaft is provided on the bevel gear, and the gear shaft is rotatably mounted inside the hollow shaft of the locking tongue. The gear shaft is provided with a keyway, and a key block is provided on the hollow shaft. The key block is slidably mounted inside the keyway. When the keyway rotates, it engages with the hollow shaft, driving the hollow shaft to rotate and disengage the locking tongue from the helmet buckle, thus releasing the locking tongue from the helmet.

[0007] Furthermore, the central angle subtended by the key block is smaller than the central angle subtended by the keyway. When the motor is off, the helmet's buckle contacts the inclined surface of the latch, driving the latch to rotate. Utilizing the elasticity of the torsion spring, the bevel gear is stationary, and the key block slides inside the keyway until the helmet's buckle disengages from the inclined surface of the latch, at which point the helmet's buckle and latch engage, completing the self-locking of the helmet.

[0008] Furthermore, the torsion spring is provided with limit pins at both ends. The torsion spring is fitted onto the gear shaft of the driven bevel gear. The limit pin at one end of the torsion spring engages with the limit hole of the locking tongue, and the limit pin at the other end of the torsion spring engages with the limit hole of the driven bevel gear. The buckle on the helmet contacts the inclined surface of the locking tongue, driving the locking tongue to rotate. The driven bevel gear is in a stationary state, and the torsion spring deforms until the buckle is below the locking tongue. The buckle disconnects from the locking tongue, and the torsion spring assists the locking tongue in returning to its initial position. The buckle and the locking tongue then engage, facilitating self-locking of the helmet.

[0009] Furthermore, the control module is equipped with sensors and is electrically connected to the motor. The control module has two internal contacts, with a baffle engaging with each contact. The control module controls the motor's rotation direction. Initially, the baffle is in contact with the first contact, and the motor is off. After the shared bicycle is unlocked by scanning the code, the motor starts, driving the incomplete gear through the gear transmission assembly. The incomplete gear, through a trapezoidal groove, drives the baffle to rotate, disengaging it from the first contact. The incomplete gear, through a main bevel gear and a driven bevel gear, drives the locking tongue to rotate until the baffle contacts the second contact. At this point, the control module shuts off the motor, and the locking tongue disengages from the helmet buckle. The sensor on the control module detects the helmet's position. When the sensor senses the helmet leaving the locking tongue, it transmits a signal to the control module, which then controls the motor to rotate in the opposite direction. The motor, through the gear transmission assembly, drives the incomplete gear in the opposite direction, and the trapezoidal groove of the incomplete gear drives the baffle in the opposite direction, disengaging it from the second contact until the baffle contacts the first contact. At this point, the control module shuts off the motor, and the locking tongue returns to its initial position.

[0010] Furthermore, the transmission assembly includes a worm gear and a worm. The worm is fixedly mounted to the output shaft of the motor, and the worm gear is rotatably mounted inside the base. The worm meshes with the worm gear, and a transmission gear is fixedly mounted on the worm gear. The motor drives the worm to rotate, the worm drives the worm gear to rotate, and the worm gear drives the transmission gear to rotate.

[0011] Furthermore, the transmission assembly also includes a driven gear and a transmission gear. The driven gear is rotatably mounted inside the base and meshes with the transmission gear. The transmission gear is rotatably mounted inside the base, and the driven gear and transmission gear are fixedly mounted. The transmission gear meshes with the incomplete gear. The transmission gear drives the driven gear to rotate, and the driven gear drives the incomplete gear to rotate through the transmission gear.

[0012] Compared with the prior art, the advantages of this utility model are: (1) This utility model is equipped with a speed change component. The motor changes the rotation speed of the incomplete gear through the speed change component, so that the output of the motor controls the rotation of the locking tongue more smoothly and continuously, and plays a role in protecting the motor; (2) This utility model is equipped with a control module. The control module and the baffle control the rotation of the motor, which limits the rotation angle of the locking tongue. By using the signal transmission with the sensor, the rotation direction of the motor can be changed in time, and at the same time, it plays a role in protecting the motor; (3) This utility model is equipped with an unlocking mechanism. The torsion spring is used to hinge the bevel gear and the locking tongue. When the motor is closed, the elastic action of the torsion spring completes the self-locking of the helmet buckle. The operation is simple, the return speed of the helmet is improved, the helmet is prevented from being lost, the practicality is high, and the structure is cleverly matched. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model from a first-view perspective.

[0014] Figure 2 This is the front view of the present invention.

[0015] Figure 3 This is the left view of the present invention.

[0016] Figure 4 for Figure 2 Cross-sectional view along the AA direction.

[0017] Figure 5 for Figure 3 Cross-sectional view along the BB direction.

[0018] Figure 6 This is a schematic diagram of the overall structure of this utility model with the lock cover removed.

[0019] Figure 7 for Figure 4 A magnified view of part C in the middle.

[0020] Figure 8 for Figure 5 A magnified view of part D in the middle.

[0021] Figure 9 for Figure 6 A magnified view of part E in the middle.

[0022] Reference numerals: 11-Base plate; 12-Base; 13-Lock cover; 14-Lock tongue; 121-Protruding column; 122-Support shaft; 21-Motor; 22-Incomplete gear; 23-Control module; 24-Speed ​​change assembly; 221-Trapezoidal groove; 241-Transmission gear; 242-Driven gear; 243-Speed ​​change gear; 244-Worm gear; 245-Worm; 31-Main bevel gear; 32-Driven bevel gear; 33-Torsion spring; 321-Gear shaft; 322-Keyway; 141-Hollow shaft; 142-Limit angle; 143-Key block; 331-Limit pin; 25-Baffle plate. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example: Figures 1-9 The illustrated electronic lock for a shared bicycle helmet includes a support mechanism and an intermittent power mechanism. The support mechanism includes a base 12 and a locking tongue 14. The locking tongue 14 is rotatably mounted on a support shaft 122 of the base 12. A lock cover 13 is fixedly mounted on the base 12. A bevel gear 32 is rotatably mounted inside the hollow shaft 141 of the locking tongue 14. A torsion spring 33 is hinged between the bevel gear 32 and the locking tongue 14. A buckle that engages with the locking tongue 14 is provided on the helmet. The intermittent power mechanism is located inside the base 12 and includes an incomplete gear 22 and a control module 23. The incomplete gear 22 is rotatably mounted inside the base 12, and the control module 23 is fixedly mounted on the base 12. Inside the base 12, a baffle 25 rotatably mounted on the control module 23 is located inside the trapezoidal groove 221 of the incomplete gear 22. The baffle 25 contacts and cooperates with the control module 23 to control the rotation direction of the output shaft of the motor 21. A speed change component 24 is provided between the motor 21 and the incomplete gear 22. The motor 21 changes the rotation direction of the incomplete gear 22 through the speed change component 24. A main bevel gear 31 is rotatably mounted on the top of the base 12. The main bevel gear 31 is fixedly mounted with the incomplete gear 22. The main bevel gear 31 meshes with the driven bevel gear 32. The incomplete gear 22 changes the rotation direction of the driven bevel gear 32 through the main bevel gear 31 to unlock the locking tongue 14.

[0025] like Figure 1 , Figure 4 , Figure 6 , Figure 7 , Figure 9As shown, the support mechanism includes a base plate 11, a base 12, a lock cover 13, and a lock tongue 14. The base plate 11 is fixedly installed at the bottom of the base 12. The intermittent power mechanism is located inside the base 12. The base plate 11 and the base 12 are sealed to cope with harsh environments. The base plate 11 prevents water and other debris from entering the interior of the base 12 and affecting the operation of the motor 21. The lock cover 13 is installed above the base 12. The unlocking mechanism is located on the base 12. The lock cover 13 isolates the unlocking mechanism from the outside. The base 12 is provided with a protruding post 121 and a support shaft 122. The lock tongue 14 is provided with a hollow shaft 141. The lock tongue 14 is rotatably mounted on the support shaft 122 of the base 12 through the hollow shaft 141. The protruding post 121 is located between the limiting angles 142. The protruding post 121 and the limiting angles 142 help limit the rotation angle of the lock tongue 14, making it easy for the lock tongue 14 to return to its initial position.

[0026] like Figure 4 , Figure 6 , Figure 7 As shown, the unlocking mechanism includes a main bevel gear 31, a driven bevel gear 32, and a torsion spring 33. The main bevel gear 31 is rotatably mounted on the base 12 and is fixedly mounted to the incomplete gear 22 of the intermittent power mechanism. The incomplete gear 22 is rotatably mounted inside the base 12. A sealing ring is provided at the rotatable connection between the main bevel gear 31 and the base 12, which separates the main bevel gear 31 from the interior of the base 12 to prevent water and other impurities from entering the interior of the base 12 through the rotatable connection between the main bevel gear 31 and the base 12, thus affecting the operation of the motor 21. The driven bevel gear 32 is rotatably mounted on the support shaft 122 of the base 12. The main bevel gear 31 and the driven bevel gear 32 are fixedly mounted to the base 12. When the main bevel gear 31 rotates, it drives the driven bevel gear 32 to rotate. The gear shaft 321 of the driven bevel gear 32 is fitted inside the hollow shaft 141 of the locking tongue 14. The gear shaft 321 of the driven bevel gear 32 and the hollow shaft 141 of the locking tongue 14 are rotatably mounted between the gear shaft 321 and the hollow shaft 141 of the locking tongue 14. A keyway 322 is provided on the gear shaft 321, and a key block 143 is provided on the hollow shaft 141. The key block 143 is slidably mounted inside the keyway 322. When the keyway 322 rotates, it engages with the hollow shaft 141, driving the hollow shaft 141 to rotate the locking tongue 14, disengaging the locking tongue 14 from the helmet buckle, and releasing the locking tongue 14 from locking the helmet.

[0027] like Figure 4 , Figure 6 , Figure 7 , Figure 9As shown, the torsion spring 33 has limit pins 331 at both ends. The torsion spring 33 is fitted onto the gear shaft 321 of the bevel gear 32. The limit pin 331 at one end of the torsion spring 33 engages with the limit hole of the locking tongue 14, and the limit pin 331 at the other end of the torsion spring 33 engages with the limit hole of the bevel gear 32. The buckle on the helmet contacts the inclined surface of the locking tongue 14, driving the locking tongue 14 to rotate. The bevel gear 32 is in a stationary state, and the torsion spring 33 deforms until the buckle is below the locking tongue 14. The buckle disconnects from the locking tongue 14, and the torsion spring 33 assists the locking tongue 14 to return to its initial position. The buckle and the locking tongue 14 then engage, facilitating self-locking of the helmet. Key block 14 When the central angle of the main bevel gear 322 is smaller than that of the keyway 322, and the motor 21 is off, the helmet buckle contacts the inclined surface of the locking tongue 14, driving the locking tongue 14 to rotate. Utilizing the elasticity of the torsion spring 33, the bevel gear 32 is stationary, and the key block 143 slides inside the keyway 322 until the helmet buckle and the inclined surface of the locking tongue 14 are disconnected, and the helmet buckle and the locking tongue 14 are engaged, completing the self-locking of the helmet. When the motor 21 is on, when the main bevel gear 31 rotates, it drives the driven bevel gear 32 to rotate. The driven bevel gear 32 drives the key block 143 through the keyway 322 to drive the locking tongue 14 to rotate, thereby disengaging the engagement between the helmet buckle and the locking tongue 14.

[0028] like Figure 5 , Figure 8As shown, the intermittent power mechanism includes a motor 21, an incomplete gear 22, a control module 23, a speed transmission assembly 24, and a baffle 25. The motor 21 is fixedly installed inside the base 12. The speed transmission assembly 24 is located inside the base 12 and includes a transmission gear 241, a driven gear 242, a speed-changing gear 243, a worm gear 244, and a worm 245. The worm 245 is fixedly installed on the output shaft of the motor 21, and the motor 21 drives the worm 245 to rotate. The worm gear 244 is rotatably installed inside the base 12. The worm 245 meshes with the worm gear 244, and the worm 245 drives the worm gear 244 to rotate. The worm gear 244 is fixedly installed on the transmission gear 241, and the worm gear 244 drives the transmission gear 241 to rotate. The driven gear 242 is fixedly installed on the base 12, and the worm gear 243 drives the transmission gear 241 to rotate. Wheel 242 is rotatably mounted inside base 12. Driven gear 242 meshes with transmission gear 241, which drives driven gear 242 to rotate. Gear 243 is rotatably mounted inside base 12. Driven gear 242 and gear 243 are fixedly mounted. Driven gear 242 drives gear 243 to rotate. Incomplete gear 22 is rotatably mounted inside base 12. Gear 243 meshes with incomplete gear 22, which drives incomplete gear 22 to rotate. Motor 21 changes the speed of incomplete gear 22 via speed change assembly 24. Trapezoidal groove 221 is provided on incomplete gear 22. Control module 23 is fixedly mounted inside base 12. Baffle 25 is rotatably mounted inside base 12. On the control module 23, a baffle 25 is disposed inside the trapezoidal groove 221 of the incomplete gear 22. The control module 23 is equipped with a sensor and is electrically connected to the motor 21. The control module 23 has two contacts, with the baffle 25 engaging with both contacts. The control module 23 controls the rotation direction of the motor 21. Initially, the baffle 25 is in contact with the first contact, at which point the motor 21 is off. After the shared bicycle is unlocked by scanning the code, the motor 21 starts, driving the incomplete gear 22 to rotate via the transmission assembly 24. The incomplete gear 22, through the trapezoidal groove 221, drives the baffle 25 to rotate, disengaging the baffle 25 from the first contact. The incomplete gear 22 then rotates through the main bevel gear 31... The bevel gear 32 drives the locking tongue 14 to rotate until the baffle 25 contacts the second contact point. At this time, the control module 23 controls the motor 21 to shut off, and the engagement between the locking tongue 14 and the helmet buckle is disengaged. The sensor on the control module 23 senses the position of the helmet. When the sensor detects that the helmet has left the locking tongue 14, it transmits a signal to the control module 23. The control module 23 controls the motor 21 to rotate in the opposite direction. The motor 21 drives the incomplete gear 22 to rotate in the opposite direction through the transmission assembly 24. The trapezoidal groove 221 of the incomplete gear 22 drives the baffle 25 to rotate in the opposite direction, breaking the contact between the baffle 25 and the second contact point. The contact continues until the baffle 25 contacts the first contact point. At this time, the control module 23 controls the motor 21 to shut off, and the locking tongue 14 returns to its initial position.

[0029] Working principle: The electronic lock is installed on the shared bicycle so that the locking tongue 14 of the electronic lock can engage with the helmet buckle. It is usually installed inside the basket of the shared bicycle. In the initial state, the baffle 25 is in contact with the first contact point. At this time, the motor 21 is in the off state. At this time, the locking tongue 14 engages with the helmet buckle, and the helmet cannot be removed.

[0030] After the user scans the code to unlock the shared bicycle, motor 21 starts, driving worm gear 245 to rotate. Worm gear 245 drives worm wheel 244 to rotate, worm wheel 244 drives transmission gear 241 to rotate, transmission gear 241 drives driven gear 242 to rotate, driven gear 242 drives variable speed gear 243 to rotate, variable speed gear 243 drives incomplete gear 22 to rotate. Motor 21 drives incomplete gear 22 to rotate and changes the speed of incomplete gear 22 through speed change assembly 24. 2. The trapezoidal groove 221 drives the baffle 25 to rotate, breaking the contact between the baffle 25 and the first contact point. During this process, the incomplete gear 22 drives the secondary bevel gear 32 to rotate through the main bevel gear 31. The secondary bevel gear 32 drives the key block 143 through the keyway 322 to drive the locking tongue 14 to rotate into the lock cover 13 until the baffle 25 contacts the second contact point. The control module 23 controls the motor 21 to shut off. At this time, the locking tongue 14 and the helmet buckle are disengaged. The sensor on the control module 23 senses the position of the helmet.

[0031] After the user removes the helmet, the sensor detects that the helmet has left the locking tongue 14 and transmits a signal to the control module 23. The control module 23 controls the motor 21 to rotate in the opposite direction. The motor 21 drives the incomplete gear 22 to rotate in the opposite direction through the transmission component 24. The trapezoidal groove 221 of the incomplete gear 22 drives the baffle 25 to rotate in the opposite direction, breaking the contact between the baffle 25 and the second contact point. During this process, the incomplete gear 22 drives the secondary bevel gear 32 to rotate in the opposite direction through the main bevel gear 31. The torsion spring 33 hinges the secondary bevel gear 32 and the locking tongue 14. Under the connection action of the torsion spring 33, the locking tongue 14 is driven to rotate in the opposite direction until the baffle 25 contacts the first contact point. The control module 23 then controls the motor 21 to shut off, and the locking tongue 14 returns to its initial position.

[0032] After using the shared bicycle, the user can lock the bicycle after placing the helmet in the designated location. With the motor 21 off, the helmet's buckle contacts the inclined surface of the locking tongue 14, driving the locking tongue 14 to rotate. Utilizing the elasticity of the torsion spring 33, the bevel gear 32 is in a stationary state, and the key block 143 slides inside the keyway 322 until the helmet's buckle disengages from the inclined surface of the locking tongue 14. The helmet's buckle then engages with the locking tongue 14, completing the self-locking of the helmet. The shared bicycle can only be returned after the helmet has self-locked. This electronic lock prevents the helmet from being lost.

[0033] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A helmet electronic lock for shared bikes, comprising a support mechanism, an intermittent power mechanism, characterized in that: The support mechanism includes a base (12) and a locking tongue (14). The locking tongue (14) is rotatably mounted on the support shaft (122) of the base (12). A lock cover (13) is fixedly mounted on the base (12). A bevel gear (32) is rotatably mounted inside the hollow shaft (141) of the locking tongue (14). A torsion spring (33) is hinged between the bevel gear (32) and the locking tongue (14). A buckle that engages with the locking tongue (14) is provided on the helmet. An intermittent power mechanism is located inside the base (12). The intermittent power mechanism includes an incomplete gear (22) and a control module (23). The incomplete gear (22) is rotatably mounted inside the base (12). The control module (23) is fixedly mounted inside the base (12). A baffle plate (25) is mounted on the upper rotating part and is set inside the trapezoidal groove (221) of the incomplete gear (22). The baffle plate (25) contacts and cooperates with the control module (23) to control the rotation direction of the output shaft of the motor (21). A speed change component (24) is provided between the motor (21) and the incomplete gear (22). The motor (21) changes the rotation direction of the incomplete gear (22) through the speed change component (24). A main bevel gear (31) is mounted on the upper part of the base (12). The main bevel gear (31) is fixedly installed with the incomplete gear (22). The main bevel gear (31) meshes with the driven bevel gear (32). The incomplete gear (22) changes the rotation direction of the driven bevel gear (32) through the main bevel gear (31) to unlock the locking tongue (14).

2. The electronic lock of a shared bike helmet according to claim 1, characterized in that: The support mechanism also includes a base plate (11), which is fixedly installed at the bottom of the base (12). The base plate (11) and the base (12) are sealed together. A sealing ring is provided at the rotating connection between the main bevel gear (31) and the base (12).

3. The electronic lock of a shared bike helmet according to claim 1, characterized in that: The bevel gear (32) is provided with a gear shaft (321), which is rotatably mounted inside the hollow shaft (141) of the locking tongue (14). The gear shaft (321) is provided with a keyway (322), and the hollow shaft (141) is provided with a key block (143), which is slidably mounted inside the keyway (322).

4. The electronic lock of a shared bike helmet according to claim 3, characterized in that: The central angle of the key block (143) is smaller than the central angle of the keyway (322).

5. The electronic lock of a shared bike helmet according to claim 1, characterized in that: The torsion spring (33) is provided with limit pins (331) at both ends. The torsion spring (33) is mounted on the gear shaft (321) of the bevel gear (32). The limit pin (331) at one end of the torsion spring (33) engages with the limit hole of the locking tongue (14), and the limit pin (331) at the other end of the torsion spring (33) engages with the limit hole of the bevel gear (32).

6. The electronic lock of a shared bike helmet according to claim 1, characterized in that: The control module (23) is equipped with a sensor and is electrically connected to the motor (21). The control module (23) has two contacts inside and the baffle (25) makes contact with the two contacts respectively. The rotation direction of the motor (21) is controlled by the control module (23).

7. The electronic lock of a shared bike helmet according to claim 1, characterized in that: The speed change assembly (24) includes a worm gear (244) and a worm (245). The worm (245) is fixedly installed on the output shaft of the motor (21). The worm gear (244) is rotatably installed inside the base (12). The worm (245) meshes with the worm gear (244). A transmission gear (241) is fixedly installed on the worm gear (244).

8. The electronic lock of a shared bike helmet according to claim 7, characterized in that: The transmission assembly (24) also includes a driven gear (242) and a transmission gear (243). The driven gear (242) is rotatably mounted inside the base (12) and meshes with the transmission gear (241). The transmission gear (243) is rotatably mounted inside the base (12) and is fixedly mounted with the transmission gear (243). The transmission gear (243) meshes with the incomplete gear (22).

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