Electric self-sucking lock actuator

Abstract

This utility model relates to the field of vehicle parts technology, specifically an electric self-closing actuator, including a housing, an actuator wheel, a first cable, and a second cable. The housing houses a rotatable actuator wheel, which is driven to move. The actuator wheel has two surfaces forming a first actuator surface and a second actuator surface. An arc-shaped actuating groove is formed on the first actuator surface along the rotation direction. A winding groove is formed between a drive disc and the second actuator surface. An arc-shaped drive groove is formed on the drive disc, communicating with the winding groove. One end face of the drive groove forms a drive surface. The first cable is driven by the first actuator surface. A coaxially rotating lever is disposed on the first actuator surface. The rotating end of the lever is rotatably fitted inside the housing. The driving end of the lever is movably connected to the force-bearing end of the first cable to drive the first cable. The second cable is driven by the second actuator surface. This invention solves the technical problem in the prior art where one actuator can only drive one cable, resulting in high cost and large space occupation.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, specifically an electric self-closing lock actuator. Background Technology

[0002] The actuator of a car hood lock is equipped with a cable. The cable is used to pull the actuator of the hood lock, such as the lock hook and push rod, so that the hood lock can switch between fully locked, half locked and fully open states. The existing actuator can only drive one cable with one motor, while the car hood lock requires at least two cables to work together. In other words, a car hood lock needs to be equipped with two actuators, which is costly and takes up a lot of space in front of the car. Summary of the Invention

[0003] To address the technical problems of high cost and large space occupation caused by existing technologies where one actuator can only drive one cable, this application proposes an electric self-priming lock actuator, which solves the above-mentioned technical problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides an electric self-closing lock actuator, comprising: a housing, wherein an actuator wheel that can be rotated after being driven is disposed within the housing; the actuator wheel, wherein two surfaces of the actuator wheel are formed as a first actuator surface and a second actuator surface, an arc-shaped actuating groove is formed on the first actuator surface along the rotation direction, one end face of the actuating groove is formed as an actuating surface, a drive disc is disposed on the second actuator surface, a winding groove is formed between the drive disc and the second actuator surface, the drive disc has an arc-shaped drive groove that communicates with the winding groove, the extension direction of the drive groove is the same as the rotation direction of the actuator wheel, one end face of the drive groove is formed as a drive surface; a first cable, wherein... The first cable is driven by the first actuating surface, on which a coaxially rotating lever is disposed. The rotating end of the lever is rotatably fitted within the housing. The driving end of the lever is movably connected to the force-receiving end of the first cable to drive the first cable. Simultaneously, a limiting pin is formed on the lever, which moves within the limiting groove. When the limiting pin is pushed by the limiting surface, it causes the first cable to perform a pulling action. The second cable is driven by the second actuating surface, and the force-receiving end of the second cable is limited to move within the driving groove. When the force-receiving end of the second cable is pushed by the driving surface, it causes the second cable to perform a pulling action.

[0006] Furthermore, the housing includes a first half-shell and a second half-shell that are joined together. A receiving space is formed inside the first half-shell, and the actuating wheel and the lever are received in the receiving space. A rotating shaft is formed on the first half-shell, and the actuating wheel and the lever are rotatably mounted on the rotating shaft.

[0007] Furthermore, the joint between the first half-shell and the second half-shell is provided with a flange and a groove that mates with the flange. The flange is formed on the first half-shell and the groove is formed on the second half-shell. After the flange is embedded in the groove, laser welding is performed to fuse the first half-shell and the second half-shell together.

[0008] Furthermore, a torsion spring is disposed on the rotating end of the lever. The rotating shaft includes a thick section fitted by the actuating wheel and a thin section fitted by the lever. The outer periphery of the thick section near one end of the thin section extends axially toward the thin section to form a mounting groove for mounting the coil of the torsion spring. An axial clearance groove is formed on the thin section for accommodating one lever arm of the torsion spring. Meanwhile, a receiving groove for mounting the coil of the torsion spring and a clearance portion for accommodating the other lever arm of the torsion spring are formed on the surface of the lever facing the clearance groove. The clearance portion communicates with the receiving groove.

[0009] Furthermore, both the first cable and the second cable include a rod and a rope extending from one end of the rod, with a force-bearing body driven by the actuating wheel connected to the end of the rope away from the rod.

[0010] Furthermore, the pull rod is inserted into the housing via a quick connector. The quick connector is sleeved on the end of the pull rod near the housing and is passed through by the rope. The quick connector includes a straight cylindrical section sleeved on the pull rod and a plug-in section for insertion. The plug-in section gradually narrows towards the inside of the housing. The narrowed part of the plug-in section includes multiple spaced plates to deform and shrink the plug-in section during insertion. A circumferentially recessed tightening ring is formed at the transition between the straight cylindrical section and the plug-in section. Correspondingly, a socket for the quick connector to be inserted is formed on the housing. The inner diameter of the socket is adapted to the outer diameter of the tightening ring. A guide cylinder extends outward from the socket on the housing. The inner diameter of the guide cylinder is adapted to the outer diameter of the straight cylindrical section. A sealing ring is disposed on the guide cylinder.

[0011] Furthermore, a movable groove is formed on the lever, and the force-bearing body of the first cable is restricted to move within the movable groove. One end of the movable groove is open, and a rope channel with an inner diameter smaller than the inner diameter of the movable groove is formed on the other end. The rope of the first cable enters the movable groove through the rope channel.

[0012] Furthermore, two limiting baffles are formed on the housing, and the two baffles are respectively disposed at the two extreme positions of the lever stroke.

[0013] Furthermore, the force-bearing body of the second cable is confined to move within the drive groove, the rope of the second cable abuts against the groove surface of the winding groove, and the rope enters the drive groove through the notch at the connection between the winding groove and the drive groove.

[0014] Furthermore, it also includes an electronic control device, which includes a drive motor disposed within the housing. A worm gear is connected to the drive shaft of the drive motor. The worm gear drives the actuating wheel through an intermediate wheel assembly. The intermediate wheel assembly includes an integrally formed and coaxially arranged turbine and a drive wheel. The turbine cooperates with the worm gear, and the drive wheel cooperates with the actuating wheel. The electronic control device also includes a micro switch for signal feedback, which is disposed within the housing. The pressing part of the micro switch is triggered by the outer peripheral surface of the drive disk and a recess formed on the outer peripheral surface of the drive disk.

[0015] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0016] The electric self-closing lock actuator of this utility model has an actuator wheel that can be rotated after being driven inside the housing. The two surfaces of the actuator wheel are formed as a first actuator surface and a second actuator surface. The first actuator surface drives a lever through a toggle groove, and the lever drives a first cable to achieve a pulling action. The second actuator surface directly drives a second cable through a drive groove to achieve a pulling action. Thus, a single actuator wheel drives two cables, solving the technical problem of high cost and large space occupation caused by a single actuator driving only one cable in the prior art. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the electric self-priming lock actuator of the utility model.

[0018] Figure 2 This is a schematic diagram from another perspective of the electric self-closing lock actuator of the utility model;

[0019] Figure 3 This is a schematic diagram of the electric self-closing lock actuator of the utility model with the housing concealed.

[0020] Figure 4 This is a schematic diagram of the lever of the electric self-closing lock actuator of the utility model;

[0021] Figure 5 This is a schematic diagram of the lever groove of the electric self-priming lock actuator of the utility model;

[0022] Figure 6 This is a partial cross-sectional view of the lever of the electric self-priming lock actuator of the utility model;

[0023] Figure 7A schematic diagram of the lever of the electric self-closing lock actuator of the utility model;

[0024] Figure 8 This is a schematic diagram of the drive slot of the electric self-closing lock actuator of the utility model.

[0025] Figure 9 This is a schematic diagram of the second half-shell of the electric self-priming lock actuator of the utility model;

[0026] Figure 10 This is a schematic diagram of the first half-shell of the electric self-priming lock actuator of the utility model.

[0027] Figure 11 This is a cross-sectional schematic diagram of the quick connector of the electric self-priming lock actuator of the utility model.

[0028] Wherein: 1-shell, 11-first half-shell, 111-rotating shaft, 1111-thick section, 1112-thin section, 1113-mounting groove, 1114-clearance groove, 112-flange, 12-second half-shell, 121-flange groove, 13-socket, 131-guide cylinder, 14-limiting baffle;

[0029] 2-Actuating wheel, 21-Actuating groove, 211-Actuating surface, 22-Coiling groove, 23-Drive groove, 231-Drive surface, 232-Notch, 24-Drive disc, 241-Concave point;

[0030] 3-First cable, 31-Lever, 311-Storage slot, 312-Allowing part, 313-Modular slot, 314-Rope channel, 32-Actuating pin, 33-Torsion spring;

[0031] 4-Second cable;

[0032] 5-Pull rod, 51-Rope, 52-Quick connector, 521-Straight section, 522-Plug-in section, 523-Tightening ring, 53-Force-bearing body, 54-Sealing ring;

[0033] 6-Electrical control device, 61-Drive motor, 62-Wheel shaft, 63-Intermediate wheel assembly, 631-Turbine, 632-Drive wheel, 64-Micro switch. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] like Figure 1-11 As shown, this utility model provides an electric self-locking actuator, including a housing 1, an actuator wheel 2, a first cable 3, and a second cable 4. The housing 1 houses the actuator wheel 2, which is rotatable after being driven. The actuator wheel 2 is preferably a gravity-eccentric actuator wheel. The two surfaces of the actuator wheel 2 form a first actuator surface and a second actuator surface. An arc-shaped actuating groove 21 is formed on the first actuator surface along the rotation direction. One end face of the actuating groove 21 forms an actuating surface 211. A drive disc 24 is disposed on the second actuator surface. A winding groove 22 is formed between the drive disc 24 and the second actuator surface. An arc-shaped drive groove 23 is formed on the drive disc 24, communicating with the winding groove 22. The extending direction of the drive groove 23 is parallel to the rotation direction of the actuator wheel 2. Similarly, one end face of the drive groove 23 is formed as a drive surface 231. The first cable 3 is driven by the first actuating surface. A coaxially rotating lever 31 is disposed on the first actuating surface. The rotating end of the lever 31 is rotatably fitted inside the housing 1. The drive end of the lever 31 is movably connected to the force-receiving end of the first cable 3 to drive the first cable 3. At the same time, a limiting pin 32 is formed on the lever 31, which moves within the lever groove 21. After the limiting pin 32 is pushed by the lever surface 211, it drives the first cable 3 to perform a pulling action. The second cable 4 is driven by the second actuating surface. The force-receiving end of the second cable 4 is limited to move within the drive groove 23. After the force-receiving end of the second cable 4 is pushed by the drive surface 231, it drives the second cable 4 to perform a pulling action. The positions of the lever groove 21 and the drive groove 23 are set only to ensure that the cable stroke is sufficient and that the various actions do not interfere with each other.

[0036] In a specific embodiment of the present invention, the housing 1 includes a first half-shell 11 and a second half-shell 12 that are assembled together. A receiving space is formed inside the first half-shell 11, and the actuating wheel 2 and the lever 31 are received in the receiving space. A rotating shaft 111 is formed on the first half-shell 11, and the actuating wheel 2 and the lever 31 are rotatably mounted on the rotating shaft 111.

[0037] Furthermore, a flange 112 and a groove 121 that mates with the flange 112 are provided at the joint of the first half shell 11 and the second half shell 12. The flange 112 is formed on the first half shell 11, and the groove 121 is formed on the second half shell 12. After the flange 112 is embedded in the groove 121, laser welding is performed to fuse the first half shell 11 and the second half shell 12.

[0038] In one specific embodiment of this utility model, a torsion spring 33 is disposed on the rotating end of the lever 31. The rotating shaft 111 includes a thick section 1111 fitted by the actuating wheel 2 and a thin section 1112 fitted by the lever 31. The outer periphery of the thick section 1111 near the thin section 1112 extends axially toward the thin section 1112 to form a mounting groove 1113 for mounting the coil of the torsion spring 33. An axial clearance groove 1114 is formed on the thin section 1112, which is used to accommodate one lever arm of the torsion spring 33. At the same time, a receiving groove 311 for mounting the coil of the torsion spring 33 and a clearance portion 312 for accommodating the other lever arm of the torsion spring 33 are formed on the surface of the lever 31 facing the clearance groove 1114. The clearance portion 312 is connected to the receiving groove 311. The function of the torsion spring 33 is to enhance the reset capability of the first cable 3. Without the torsion spring 33, the reset of the first cable 3 and the second cable 4 is achieved by the reset of the actuator on the lock at the end of the actuator. For example, the ratchet and pawl on the lock are equipped with reset torsion springs. However, sometimes the reset force on the pawl is small. Therefore, the torsion spring 33 is installed on the lever 31 to assist the reset of the first cable 3 connected to the pawl.

[0039] In a specific embodiment of this utility model, both the first cable 3 and the second cable 4 include a pull rod 5 and a rope 51 extending from one end of the pull rod 5. The end of the rope 51 away from the pull rod 5 is connected to a force-receiving body 53 driven by the actuating wheel 2. The force-receiving body 53 of the first cable 3 is spherical, and the force-receiving body 53 of the second cable 4 is cylindrical.

[0040] In a preferred embodiment of this utility model, the pull rod 5 is inserted into the housing 1 via a quick connector 52, specifically a first half-shell 11 with a receiving space. The quick connector 52 is sleeved on the end of the pull rod 5 near the housing 1 and is passed through by a rope 51. The quick connector 52 includes a straight cylindrical section 521 for sleeved pull rod 5 and a plug-in section 522 for insertion. The section of the plug-in section 522 gradually narrows towards the inside of the housing 1. The narrowed part of the plug-in section 522 includes multiple spaced plates to deform and contract the plug-in section 522 during insertion. The straight cylindrical section 521 and the plug-in section... A circumferentially recessed tightening ring 523 is formed at the transition point. Correspondingly, a socket 13 for inserting the quick connector 52 is formed on the housing 1. The inner diameter of the socket 13 is adapted to the outer diameter of the tightening ring 523. A guide cylinder 131 extends outward from the socket 13 on the housing 1. The inner diameter of the guide cylinder 131 is adapted to the outer diameter of the straight section 521, thereby ensuring that the quick connector 52 after being inserted into the first half-shell 11 can be firmly connected to the first half-shell 11 and will not fall off. A sealing ring 54 is provided on the guide cylinder 131 to ensure waterproof sealing.

[0041] In a preferred embodiment of the present invention, a movable groove 313 is formed on the lever 31, and the force-bearing body 53 of the first cable 3 is restricted to move within the movable groove 313. One end of the movable groove 313 is open, and a rope 51 channel 314 with an inner diameter smaller than the inner diameter of the movable groove 313 is formed on the other end. The rope 51 of the first cable 3 enters the movable groove 313 through the rope 51 channel 314.

[0042] In a preferred embodiment of the present invention, two limiting baffles 14 are formed on the housing 1. The two baffles are respectively arranged at the two extreme positions of the stroke of the lever 31. The function of the baffles is to prevent the lever 31 from being over-twisted and to prevent it from touching the electronic control device 6, such as the intermediate wheel set 63 of the electronic control device 6.

[0043] In a preferred embodiment of the present invention, the force-bearing body 53 of the second cable 4 is confined within the drive groove 23, and the rope 51 of the second cable 4 abuts against the groove surface of the coiling groove 22. The rope 51 enters the drive groove 23 through the notch 232 at the connection between the coiling groove 22 and the drive groove 23.

[0044] In a preferred embodiment of this utility model, an electronic control device 6 is further included. The electronic control device 6 includes a drive motor 61 disposed in the housing 1. A worm gear 62 is connected to the drive shaft of the drive motor 61. The worm gear 62 drives the actuator wheel 2 through an intermediate wheel set 63. The intermediate wheel set 63 includes an integrally formed and coaxially arranged turbine 631 and a drive wheel 632. The turbine 631 cooperates with the worm gear 62, and the drive wheel 632 cooperates with the actuator wheel 2. The electronic control device 6 also includes a micro switch 64 for signal feedback. The micro switch 64 is disposed in the housing 1. The pressing part of the micro switch 64 is triggered by the outer peripheral surface of the drive disk 24 and the recess 241 formed on the outer peripheral surface of the drive disk 24. When the pressing part of the micro switch 64 is at the recess 241 on the outer peripheral surface of the drive disk 24, the vehicle hood lock is in a fully locked state.

[0045] The process of integrating the electric self-closing lock actuator of this utility model with the vehicle lock is as follows:

[0046] During the unlocking process, when the vehicle lock is in the fully locked state, the actuator wheel 2 rotates, the lever 31 on the first actuator surface moves, and the first cable 3 performs a pulling action once, causing the vehicle lock to move from the fully locked state to the half-locked state; when the first cable 3 resets, the actuator wheel 2 rotates again, and the first cable 3 performs a second pulling action, causing the vehicle lock to move from the half-locked state to the fully open state.

[0047] During the locking process, when the vehicle lock is in a half-locked state, the actuator wheel 2 rotates, and the second cable 4 on the second actuator surface performs a pulling action, causing the vehicle lock to enter the fully locked state from the half-locked state.

[0048] Among them, such as Figure 3 As shown, when the vehicle lock is in the fully locked initial position, the cylindrical force-bearing body 53 of the second cable 4 is located in the dark blue position. As the actuator wheel 2 rotates during the unlocking process, the force-bearing body 53 in the dark blue position is driven to the green position by the drive groove 23. During this process, the second cable 4 does not pull. Then, by external force, the front cover is not completely closed, and the vehicle lock enters the half-lock state. The actuator wheel 2 rotates, and the drive surface 231 pushes the force-bearing body 53 in the green position of the second cable 4. The force-bearing body 53 in the green position rotates to the orange position. At this time, under the gravity-eccentric actuator wheel 2 resetting due to gravity, or driven by the external force of the electronic control device 6, the rope 51 of the second cable 4 will be driven by the groove surface of the coiling groove 22, and the force-bearing body 53 of the second cable 4 moves from the orange position to the dark blue initial position.

[0049] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An electric self-locking actuator, characterized in that, include: Housing (1), wherein an actuator wheel (2) is disposed inside the housing (1) and is rotatable after being driven. An actuating wheel (2) has two surfaces forming a first actuating surface and a second actuating surface. An arc-shaped actuating groove (21) is formed on the first actuating surface along the rotation direction. One end face of the actuating groove (21) is formed as an actuating surface (211). A driving disk (24) is disposed on the second actuating surface. A coiling groove (22) is formed between the driving disk (24) and the second actuating surface. An arc-shaped driving groove (23) is formed on the driving disk (24) that communicates with the coiling groove (22). The extension direction of the driving groove (23) is the same as the rotation direction of the actuating wheel (2). One end face of the driving groove (23) is formed as a driving surface (231). The first cable (3) is driven by the first actuating surface. A lever (31) is arranged on the first actuating surface and rotates coaxially. The rotating end of the lever (31) is rotatably fitted in the housing (1). The driving end of the lever (31) is movably connected to the force-receiving end of the first cable (3) to drive the first cable (3). At the same time, a lever pin (32) with a limit position is formed on the lever (31) and moves in the lever groove (21). After the lever pin (32) is pushed by the lever surface (211), it drives the first cable (3) to achieve a pulling action. The second cable (4) is driven by the second actuating surface. The force-bearing end of the second cable (4) is limited to move within the drive groove (23). After the force-bearing end of the second cable (4) is pushed by the drive surface (231), the second cable (4) will achieve a pulling action.

2. The electric self-locking actuator according to claim 1, characterized in that, The housing (1) includes a first half-shell (11) and a second half-shell (12) that are joined together. A receiving space is formed inside the first half-shell (11), and the actuating wheel (2) and the lever (31) are received in the receiving space. A rotating shaft (111) is formed on the first half-shell (11), and the actuating wheel (2) and the lever (31) are rotatably mounted on the rotating shaft (111).

3. The electric self-locking actuator according to claim 2, characterized in that, The first half-shell (11) and the second half-shell (12) are provided with a flange (112) and a groove (121) that mates with the flange (112). The flange (112) is formed on the first half-shell (11) and the groove (121) is formed on the second half-shell (12). The flange (112) is embedded in the groove (121) and then laser welding is performed to fuse the first half-shell (11) and the second half-shell (12).

4. The electric self-locking actuator according to claim 2, characterized in that, A torsion spring (33) is disposed on the rotating end of the lever (31). The rotating shaft (111) includes a thick section (1111) fitted by the actuating wheel (2) and a thin section (1112) fitted by the lever (31). The outer periphery of the thick section (1111) near the end of the thin section (1112) extends axially toward the thin section (1112) to form a mounting groove (1113) for mounting the coil of the torsion spring (33). 12) A clearance groove (1114) is formed along the axial direction, the clearance groove (1114) is used to accommodate one arm of the torsion spring (33); at the same time, a receiving groove (311) for mounting the coil of the torsion spring (33) and a clearance part (312) for accommodating the other arm of the torsion spring (33) are formed on the surface of the lever (31) facing the clearance groove (1114), the clearance part (312) is connected to the receiving groove (311).

5. The electric self-locking actuator according to claim 1, characterized in that, The first cable (3) and the second cable (4) both include a rod (5) and a rope (51) extending from one end of the rod (5), with a force-bearing body (53) driven by the actuating wheel (2) connected to the end of the rope (51) away from the rod (5).

6. The electric self-locking actuator according to claim 5, characterized in that, The pull rod (5) is inserted into the housing (1) via a quick connector (52). The quick connector (52) is sleeved on one end of the pull rod (5) near the housing (1) and is passed through by the rope (51). The quick connector (52) includes a straight cylindrical section (521) sleeved on the pull rod (5) and a plug section (522) for insertion. The section of the plug section (522) gradually narrows towards the inside of the housing (1). The narrowing part of the plug section (522) includes multiple spaced plates to deform and contract the plug section (522) during insertion. A circumferentially recessed tightening ring (523) is formed at the transition between the straight section (521) and the plug section (522). Correspondingly, a socket (13) for inserting the quick connector (52) is formed on the housing (1). The inner diameter of the socket (13) is adapted to the outer diameter of the tightening ring (523). A guide cylinder (131) extends outward from the socket (13) on the housing (1). The inner diameter of the guide cylinder (131) is adapted to the outer diameter of the straight section (521). A sealing ring (54) is disposed on the guide cylinder (131).

7. The electric self-locking actuator according to claim 5, characterized in that, A movable groove (313) is formed on the lever (31). The force-bearing body (53) of the first cable (3) is restricted to move within the movable groove (313). One end of the movable groove (313) is open, and a rope (51) channel (314) with an inner diameter smaller than the inner diameter of the movable groove (313) is formed on the other end. The rope (51) of the first cable (3) enters the movable groove (313) through the rope (51) channel (314).

8. The electric self-priming lock actuator according to claim 1, characterized in that, Two limiting baffles (14) are formed on the housing (1), and the two baffles are respectively arranged at the two extreme positions of the stroke of the lever (31).

9. The electric self-locking actuator according to claim 5, characterized in that, The force-bearing body (53) of the second cable (4) is confined within the drive groove (23) and the rope (51) of the second cable (4) abuts against the groove surface of the coiling groove (22). The rope (51) enters the drive groove (23) through the notch (232) at the connection between the coiling groove (22) and the drive groove (23).

10. The electric self-locking actuator according to claim 1, characterized in that, It also includes an electronic control device (6), which includes a drive motor (61) disposed in the housing (1). A worm gear (62) is connected to the drive shaft of the drive motor (61). The worm gear (62) drives the actuating wheel (2) through an intermediate wheel set (63). The intermediate wheel set (63) includes an integrally formed and coaxially arranged turbine (631) and a drive wheel (632). The turbine (631) cooperates with the worm gear (62), and the drive wheel (632) cooperates with the actuating wheel (2). The electronic control device (6) also includes a micro switch (64) for signal feedback. The micro switch (64) is disposed in the housing (1). The pressing part of the micro switch (64) is triggered by the outer peripheral surface of the drive disk (24) and the recess (241) formed on the outer peripheral surface of the drive disk (24).

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