Magnetic head arm assembly of hard disk and hard disk

Abstract

The utility model belongs to the technical field of computer data storage and read-write, and discloses an access arm assembly of a hard disk and the hard disk, the access arm assembly of the hard disk comprises a coil cantilever and a magnetic head cantilever, the coil cantilever is connected with the magnetic head cantilever, the magnetic head cantilever is used for connecting a magnetic head, and a containing groove is arranged in the coil cantilever for containing a voice coil. The bottom of the accommodating groove is provided with a coil limiting groove which is recessed towards the magnetic head cantilever by a specified depth, and during working, the coil limiting groove effectively limits the moving direction of a voice coil and stabilizes the position of the voice coil, so that a voice coil motor can accurately drive the magnetic head cantilever, a magnetic head accurately positions a target magnetic track of a disc, and the data reading and writing accuracy is greatly improved. Meanwhile, excessive displacement of the voice coil is avoided, friction between the voice coil and the inner wall of the containing groove is reduced, abrasion is reduced, the service life of parts is prolonged, and the overall reliability and service life of the hard disk are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of computer data storage and reading and writing, in particular to a magnetic head arm assembly of a hard disk and a hard disk. Background Art

[0002] In the structure of existing hard disks, the head arm is a vital component. The head arm is provided with a receiving groove for placing the voice coil. Currently, the bottom of these receiving grooves is usually designed to be flat.

[0003] Since the bottom of the accommodating groove is flat, when the head arm moves at high speed, the voice coil lacks an effective positioning and restraint mechanism in the groove. During the operation of the hard disk, the head arm needs to swing frequently to realize the head seek operation. In this process, the voice coil is easily displaced at the bottom of the flat groove due to inertia, vibration and other factors. The displacement of the voice coil will cause the relative position between it and the head arm to change, which in turn affects the driving effect of the voice coil motor and makes it impossible for the head arm to accurately position the head, causing errors when the hard disk reads and writes data, reducing the data reading and writing accuracy and reading and writing speed of the hard disk. In addition, frequent displacement will cause friction between the voice coil and the inner wall of the groove, accelerating the wear of the coil and the groove. Long-term use can easily lead to damage to the voice coil, increase the failure rate of the hard disk, and reduce the reliability and service life of the hard disk. Utility Model Content

[0004] The main purpose of the utility model is to provide a head arm assembly for a hard disk and a hard disk, aiming to solve the technical problem that the bottom of the existing accommodating groove for placing the voice coil is designed to be flat, which makes the voice coil easy to move and reduces the performance and reliability of the hard disk.

[0005] In order to achieve the above utility model object, the utility model provides a magnetic head arm assembly of a hard disk, which is used to move the magnetic head under the drive of a driving device, and includes a coil cantilever and a magnetic head cantilever;

[0006] The coil cantilever is connected to the magnetic head cantilever, and the magnetic head cantilever is used to connect the magnetic head;

[0007] The coil cantilever is provided with a receiving groove, the receiving groove is used to place the voice coil of the driving device, and the bottom of the receiving groove is provided with a coil limiting groove, the coil limiting groove is recessed to a specified depth toward the head cantilever.

[0008] Furthermore, the coil cantilever includes a first cantilever and a second cantilever in contact with the coil limiting groove, and the first cantilever and the second cantilever are arranged opposite to each other.

[0009] Further, the second cantilever includes a first connecting portion and a first limiting portion, the first connecting portion is connected to the head cantilever, the first limiting portion is arranged at an end of the first connecting portion away from the head cantilever, and a limiting groove is arranged at the connection between the first connecting portion and the first limiting portion, and the limiting groove is located on a side of the second cantilever away from the accommodating groove.

[0010] Further, the first limiting portion extends toward the accommodating groove and is bent by a specified length, and a width between two side edges of the first limiting portion gradually decreases from the first connecting portion toward a free end of the first limiting portion.

[0011] Further, the first cantilever includes a second connecting portion and a second limiting portion, the second connecting portion is connected to the head cantilever, the second limiting portion is arranged at an end of the second connecting portion away from the head cantilever, and the second limiting portion protrudes toward the accommodating groove.

[0012] Furthermore, the head suspension comprises a head connecting arm and a suspension body connected to the head connecting arm, the suspension body is located between the head connecting arm and the coil suspension, and the coil suspension, the head connecting arm and the suspension body are an integrated piece.

[0013] Furthermore, a pivot hole for placing a rotating shaft is provided at one end of the cantilever body close to the coil cantilever, a plug-in column and a limiting platform are provided on the inner wall of the pivot hole, and the plug-in column and the limiting platform are arranged opposite to each other.

[0014] Furthermore, a limiting protrusion is also provided on the cantilever body, and the limiting protrusion is located on a side of the cantilever body connected to the first cantilever.

[0015] Furthermore, the top opening width of the coil limiting groove is less than or equal to half the width of the entire bottom of the accommodating groove.

[0016] The utility model also provides a hard disk, comprising the magnetic head arm assembly of the hard disk described in any one of the above embodiments.

[0017] Beneficial effects:

[0018] The utility model discloses a magnetic head arm assembly of a hard disk, which is used to move a magnetic head under the drive of a driving device, and includes a coil cantilever and a magnetic head cantilever; the coil cantilever is connected to the magnetic head cantilever, and the magnetic head cantilever is used to connect the magnetic head; a receiving groove is arranged in the coil cantilever, and the receiving groove is used to place the voice coil of the driving device, and a coil limiting groove is arranged at the bottom of the receiving groove, and the coil limiting groove is recessed to a specified depth toward the magnetic head cantilever. By arranging the coil limiting groove at the bottom of the receiving groove, the moving direction of the voice coil coil in the receiving groove is effectively restricted, and the stable position of the voice coil coil improves the accuracy of the voice coil motor driving the magnetic head arm, and the precise driving can make the magnetic head accurately positioned on the target track of the disk, greatly improving the accuracy of data reading and writing, and avoiding excessive displacement of the voice coil coil, thereby significantly reducing the friction between the voice coil coil and the inner wall of the receiving groove, improving the overall reliability and service life of the hard disk, and reducing the maintenance cost and data loss risk caused by component replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the overall structure of a magnetic head arm assembly of a hard disk according to an embodiment of the utility model.

[0020] in:

[0021] 1. Coil cantilever; 2. Magnetic head cantilever; 3. Accommodating groove; 4. Coil limiting groove; X, first direction; Y, second direction;

[0022] 10. first cantilever; 11. second cantilever;

[0023] 110, first connecting portion; 111, first limiting portion; 112, limiting groove;

[0024] 101. second connecting portion; 102. second limiting portion;

[0025] 20. Magnetic head connecting arm; 21. Cantilever body; 22. Pivot hole; 23. Connecting column; 24. Limiting platform; 25. Limiting protrusion.

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] Reference Figure 1 , this embodiment provides a magnetic head arm assembly of a hard disk, which is used to move a magnetic head under the drive of a driving device, and includes a coil cantilever 1 and a magnetic head cantilever 2;

[0032] The coil suspension 1 is connected to the head suspension 2, and the head suspension 2 is used to connect the magnetic head;

[0033] The coil cantilever 1 is provided with a receiving groove 3, and the receiving groove 3 is used to place the voice coil of the driving device. The bottom of the receiving groove 3 is provided with a coil limiting groove 4, and the coil limiting groove 4 is recessed to a specified depth toward the head cantilever 2, wherein the head arm assembly of the hard disk is connected to the bottom plate of the hard disk through a rotating shaft.

[0034] In the above embodiment, the head arm assembly of the hard disk is used to move the magnetic head under the drive of the driving device, and includes a coil cantilever 1 and a head cantilever 2, wherein the driving device is preferably a voice coil motor, and the driving device provides power to the head arm assembly so that it can move the magnetic head to perform data reading and writing operations; the main function of the head cantilever 2 is to connect the magnetic head, and it accurately positions the magnetic head at the corresponding position of the hard disk platter to ensure the accuracy of data reading and writing; the coil cantilever 1 is connected to the head cantilever 2, and the accommodating groove 3 inside it is used to place the voice coil coil, which is a key component of the voice coil motor to generate driving force; at the bottom of the accommodating groove 3 of the coil cantilever 1 The coil limiting groove 4 provided at the bottom is recessed to a specified depth toward the head cantilever 2. The coil limiting groove 4 can effectively limit the movement of the voice coil in the groove to prevent it from being displaced due to vibration, inertia and other factors when the hard disk is working. The shape of the coil limiting groove 4 is preferably V-shaped, and the top opening width of the coil limiting groove 4 is less than or equal to half the width of the entire bottom of the groove 3, wherein the length direction is the first direction X, and the width direction is the second direction Y. Under the premise of not affecting the function and range of motion of the voice coil, the smaller opening width effectively limits the voice coil while ensuring the structural strength of the entire head arm assembly. The head arm assembly is connected to the bottom plate of the hard disk through a rotating shaft, and the rotating shaft plays a role of support and rotation, so that the head arm assembly can be flexibly rotated on the bottom plate of the hard disk with the rotating shaft as the center, thereby realizing the radial movement of the magnetic head on the disk. The head cantilever 2, the coil cantilever 1 and the rotating shaft together constitute a relatively stable structure. The head cantilever 2 is located at the front end and is directly connected to the magnetic head, and the coil cantilever 1 is located behind it.

[0035] When the hard disk starts working, the voice coil coil in the groove 3 receives the driving signal of the voice coil motor and drives the coil cantilever 1 to rotate along the shaft. Since the coil cantilever 1 and the head cantilever 2 are an integrated part, the head cantilever 2 is driven to rotate, so that the head cantilever 2 drives the magnetic head to move on the disk. The magnetic head searches for the target track on the disk according to the control signal and performs data reading and writing operations. During the whole process, the head arm assembly rotates stably on the hard disk base plate through the shaft to ensure that the magnetic head can be accurately positioned at various positions of the disk to achieve efficient data reading and writing. A protrusion corresponding to the coil limiting groove 4 is formed on one side of the voice coil coil, so that when the voice coil coil is placed in the accommodating groove 3, the protrusion of the voice coil coil is located in the coil limiting groove 4, that is, the bottom shape of the voice coil coil in contact with the accommodating groove 3 is the shape formed by the bottom of the accommodating groove 3 plus the coil limiting groove 4. Therefore, by arranging the coil limiting groove 4 at the bottom of the accommodating groove 3, the moving direction of the voice coil coil in the accommodating groove 3 is effectively restricted, and the stable position of the voice coil coil improves the accuracy of the voice coil motor driving the head arm. The precise drive can accurately position the head on the target track of the disk, greatly improving the accuracy of data reading and writing, while avoiding excessive displacement of the voice coil coil, thereby significantly reducing the friction between the voice coil coil and the inner wall of the accommodating groove 3, improving the overall reliability and service life of the hard disk, and reducing the maintenance cost and data loss risk caused by component replacement.

[0036] Reference Figure 1 In one embodiment, the coil cantilever 1 includes a first cantilever 10 and a second cantilever 11 in contact with the coil limiting groove 4, and the first cantilever 10 and the second cantilever 11 are arranged opposite to each other.

[0037] In the above embodiment, the coil cantilever 1 includes a first cantilever 10 and a second cantilever 11. The first cantilever 10 and the second cantilever 11 are arranged opposite to each other, and together form a space for accommodating and constraining the voice coil coil. The second cantilever 11 is in contact with the coil limiting groove 4. The coil limiting groove 4 is located at the bottom of the accommodating groove 3 and is recessed to a specified depth toward the head cantilever 2 to limit the movement of the voice coil coil. The first cantilever 10 and the second cantilever 11 together form an enclosing constraint structure for the voice coil coil, which limits the freedom of movement of the voice coil coil in the horizontal direction, so that the voice coil coil maintains a relatively fixed position in the accommodating groove 3, ensuring that the voice coil coil is always in the correct position during operation, thereby improving the accuracy of the voice coil motor driving the head arm.

[0038] Reference Figure 1In one embodiment, the second cantilever 11 includes a first connecting portion 110 and a first limiting portion 111, the first connecting portion 110 is connected to the head cantilever 2, the first limiting portion 111 is arranged at an end of the first connecting portion 110 away from the head cantilever 2, and a limiting groove 112 is arranged at the connection between the first connecting portion 110 and the first limiting portion 111, and the limiting groove 112 is located on a side of the second cantilever 11 away from the accommodating groove 3.

[0039] In the above embodiment, the second cantilever 11 includes a first connecting portion 110 and a first limiting portion 111. The first connecting portion 110, as a part of the second cantilever 11, mainly serves to connect the head cantilever 2. It closely connects the second cantilever 11 with the head cantilever 2 so that power can be effectively transmitted therebetween. The first limiting portion 111 is arranged at one end of the first connecting portion 110 away from the head cantilever 2. Its main function is to limit the voice coil to prevent it from excessive movement in the accommodating groove 3. A limiting groove 112 is arranged at the connection between the first connecting portion 110 and the first limiting portion 111. The limiting groove 112 is located on the side of the second cantilever 11 away from the accommodating groove 3. The shape and size of the limiting groove 112 match other components (fixed structures or other auxiliary components inside the hard disk) to directly constrain them. The limiting groove 112 is located on the outside of the second cantilever 11. When the hard disk is working, it can abut against other components inside the hard disk to ensure that the second cantilever 11 will not rotate excessively in the rotation direction during the operation of the hard disk.

[0040] Reference Figure 1 In one embodiment, the first limiting portion 111 extends toward the accommodating groove 3 and bends a specified length, and the width between the two side edges of the first limiting portion 111 gradually decreases from the first connecting portion 110 toward the free end of the first limiting portion 111.

[0041] In the above embodiment, the first limiting portion 111 is a key part of the second cantilever 11, and is used to accurately limit the voice coil. It starts from the end of the first connecting portion 110 away from the head cantilever 2 and extends toward the accommodating groove 3. At the same time, the first limiting portion 111 is bent after extending a certain length to form a specific shape. The width between its two side edges gradually decreases from the connection with the first connecting portion 110 to the free end. When the hard disk generates vibration during operation, the voice coil will resonate or be forced to vibrate. The first limiting portion 111 with a gradually changing width can gradually dissipate the vibration energy through contact and friction with the voice coil, suppress excessive vibration of the voice coil, and make the voice coil return to a stable state more quickly, thereby reducing position deviation and unstable movement caused by vibration, improving the stability and smoothness of the voice coil movement, and ensuring the accuracy and stability of the voice coil motor driving the head arm assembly.

[0042] Reference Figure 1 In one embodiment, the first cantilever 10 includes a second connecting portion 101 and a second limiting portion 102, the second connecting portion 101 is connected to the head cantilever 2, the second limiting portion 102 is arranged at an end of the second connecting portion 101 away from the head cantilever 2, and the second limiting portion 102 protrudes toward the accommodating groove 3.

[0043] In the above embodiment, the first cantilever 10 includes a second connecting portion 101 and a second limiting portion 102. The second connecting portion 101 is a portion of the first cantilever 10 connected to the head cantilever 2, and establishes a mechanical connection between the first cantilever 10 and the head cantilever 2, so that the two can work together to transmit power; the second limiting portion 102 is located at an end of the second connecting portion 101 away from the head cantilever 2, and its main function is to limit the voice coil in the accommodating groove 3. The second limiting portion 102 protrudes toward the accommodating groove 3. When the voice coil is in the accommodating groove 3, the protrusion of the second limiting portion 102 can constrain the voice coil from one side to prevent it from excessively moving in this direction, and cooperates with the second cantilever 11 to ensure the stability of the voice coil in the accommodating groove 3, which helps to maintain the stable position of the voice coil during the operation of the hard disk and avoid displacement caused by factors such as vibration and inertia. The stable voice coil position improves the accuracy of the voice coil motor drive, thereby improving the accuracy of the head positioning and reducing data reading and writing errors.

[0044] Reference Figure 1 In one embodiment, the head suspension 2 includes a head connecting arm 20 and a suspension body 21 connected to the head connecting arm 20, the suspension body 21 is located between the head connecting arm 20 and the coil suspension 1, and the coil suspension 1, the head connecting arm 20 and the suspension body 21 are an integrated piece.

[0045] In the above embodiment, the head suspension 2 includes a head connecting arm 20 and a suspension body 21. The head connecting arm 20 is mainly used to connect the magnetic head. It is a direct connection link between the magnetic head and the head suspension 2, ensuring that the magnetic head can accurately move on the disk with the movement of the head suspension 2; the suspension body 21 is located between the head connecting arm 20 and the coil suspension 1, and plays a role of connection and support; the coil suspension 1, the head connecting arm 20 and the suspension body 21 are an integrated part. This one-piece design greatly enhances the overall structural strength of the head suspension 2. From the perspective of the connection relationship, one end of the head connecting arm 20 is connected to the magnetic head, and the other end is connected to the suspension body 21. The suspension body 21 is then connected to the coil suspension 1. A coherent structure is formed. In terms of position, the head connecting arm 20 is at the front end and directly contacts with the magnetic head. The cantilever body 21 plays a transition and supporting role in the middle. The coil cantilever 1 is located at the rear end and is associated with the driving device. When the voice coil motor is driven, the power is transmitted from the coil cantilever 1 to the cantilever body 21, and then the magnetic head is driven to move on the disk through the head connecting arm 20. The one-piece design ensures that there will be no energy loss or movement deviation caused by loose connection of components during the power transmission process, thereby improving the working efficiency and reliability of the head arm assembly, while ensuring the accuracy and stability of the magnetic head during movement, improving the accuracy of head positioning, and thus improving the accuracy and speed of data reading and writing.

[0046] Reference Figure 1 In one embodiment, a pivot hole 22 for placing a rotating shaft is provided at one end of the cantilever body 21 close to the coil cantilever 1, and a plug-in column 23 and a limit platform 24 are provided on the inner wall of the pivot hole 22, and the plug-in column 23 is arranged opposite to the limit platform 24.

[0047] In the above embodiment, the pivot hole 22 is located at one end of the cantilever body 21 close to the coil cantilever 1, and its main purpose is to place the shaft, which is a key component connecting the head arm assembly and the hard disk base plate, so that the head arm assembly can rotate around the shaft, thereby realizing the radial movement of the magnetic head on the disk. On the inner wall of the pivot hole 22, there are provided a plug-in column 23 and a limit platform 24, which are arranged oppositely. The plug-in column 23 is usually a raised columnar structure, which can cooperate with the corresponding groove on the shaft to play a role in preliminary positioning and fixing the shaft. The role of the limiting platform 24 is to prevent the shaft from excessive axial movement in the pivot hole 22. The limiting platform 24 is a limiting structure formed by cutting a predetermined arc in the pivot hole 22. It works together with the plug-in column 23 to further limit the position of the shaft, ensuring that the shaft is firmly installed in the pivot hole 22 and rotates smoothly. When the shaft is inserted into the pivot hole 22, the head arm assembly can be tightly connected to the hard disk base plate through the cooperation of the plug-in column 23 and the limiting platform 24, ensuring that the head can be accurately positioned on the target track of the disk, thereby improving the accuracy of data reading and writing.

[0048] Reference Figure 1 In one embodiment, a limiting protrusion 25 is further provided on the cantilever body 21 , and the limiting protrusion 25 is located on a side of the cantilever body 21 connected to the first cantilever 10 .

[0049] In the above embodiment, the limiting protrusion 25 is a protruding structure arranged on the cantilever body 21. The limiting protrusion 25 is located on the side of the cantilever body 21 connected to the first cantilever 10. Its shape and size are designed according to the assembly requirements inside the hard disk. When the hard disk is working, the limiting protrusion 25 cooperates with other components of the hard disk (such as the groove) to form a precise mechanical constraint relationship, which limits the freedom of the cantilever body 21 in a specific direction, making it difficult for it to rotate excessively when subjected to external force. When subjected to force, the limiting protrusion 25 will be stuck in the corresponding groove and abut against other components of the hard disk, preventing the cantilever body 21 from excessively rotating in the rotation direction due to external force.

[0050] The utility model also provides a hard disk, comprising the magnetic head arm assembly of the hard disk described in any one of the above embodiments.

[0051] In the above embodiment, the hard disk includes a head arm assembly of the hard disk. The optimized design of each component in the head arm assembly works together to greatly improve the accuracy of hard disk data reading and writing, providing users with a more reliable and efficient data storage solution, and effectively ensuring data security and stable access.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A magnetic head arm assembly of a hard disk, used to move a magnetic head driven by a driving device, characterized in that: including a coil suspension and a head suspension; The coil cantilever is connected to the magnetic head cantilever, and the magnetic head cantilever is used to connect the magnetic head; The coil cantilever is provided with a receiving groove, the receiving groove is used to place the voice coil of the driving device, and the bottom of the receiving groove is provided with a coil limiting groove, the coil limiting groove is recessed to a specified depth toward the head cantilever.

2. The magnetic head arm assembly of a hard disk according to claim 1, characterized in that: The coil cantilever comprises a first cantilever and a second cantilever in contact with the coil limiting groove, and the first cantilever is arranged opposite to the second cantilever.

3. The magnetic head arm assembly of a hard disk according to claim 2, characterized in that: The second cantilever includes a first connecting portion and a first limiting portion, the first connecting portion is connected to the head cantilever, the first limiting portion is arranged at an end of the first connecting portion away from the head cantilever, and a limiting groove is arranged at the connection between the first connecting portion and the first limiting portion, and the limiting groove is located on a side of the second cantilever away from the accommodating groove.

4. The magnetic head arm assembly of a hard disk according to claim 3, characterized in that: The first limiting portion extends toward the accommodating groove and is bent by a specified length, and a width between two side edges of the first limiting portion gradually decreases from the first connecting portion toward a free end of the first limiting portion.

5. The magnetic head arm assembly of a hard disk according to claim 2, characterized in that: The first cantilever includes a second connecting portion and a second limiting portion, the second connecting portion is connected to the head cantilever, the second limiting portion is arranged at an end of the second connecting portion away from the head cantilever, and the second limiting portion protrudes toward the accommodating groove.

6. The magnetic head arm assembly of a hard disk according to claim 2, characterized in that: The head suspension comprises a head connecting arm and a suspension body connected to the head connecting arm. The suspension body is located between the head connecting arm and the coil suspension, and the coil suspension, the head connecting arm and the suspension body are an integrated piece.

7. The magnetic head arm assembly of a hard disk according to claim 6, characterized in that: A pivot hole for placing a rotating shaft is arranged at one end of the cantilever body close to the coil cantilever, a plug-in column and a limiting platform are arranged on the inner wall of the pivot hole, and the plug-in column is arranged opposite to the limiting platform.

8. The magnetic head arm assembly of a hard disk according to claim 6, characterized in that: A limiting protrusion is also provided on the cantilever body, and the limiting protrusion is located at a side of the cantilever body connected to the first cantilever.

9. The magnetic head arm assembly of a hard disk according to claim 1, characterized in that: The top opening width of the coil limiting groove is less than or equal to half the width of the entire bottom of the accommodating groove.

10. A hard disk, characterized in that: A magnetic head arm assembly for a hard disk comprising the magnetic head arm assembly of any one of claims 1-9.

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