A linear motor and power tool with buffering function at extreme positions

Abstract

The present invention discloses a linear motor and electric tool with a buffering function at an extreme position, including a stator assembly, a mover assembly and a support positioning member built into a housing, the mover assembly performs linear reciprocating motion in the stator assembly and the support positioning member, a buffer chamber is arranged in the housing, a piston body that moves synchronously with the mover assembly is fixedly connected to the mover assembly, the piston body is slidably arranged in the buffer chamber and divides the buffer chamber into a first chamber and a second chamber, the side wall of the buffer chamber ring is arranged with a first vent hole and a second vent hole, when the piston body moves to the extreme position of the first chamber or the second chamber, the piston body blocks or exceeds the first vent hole or the second vent hole, and compresses the fluid in the first chamber or the second chamber, so that an air pressure difference is formed between the two, and the piston body is buffered. The present invention plays a buffering role when the mover assembly runs to the extreme position, reduces its impact on the housing, and at the same time maintains sufficient power without loss during most of the time during the operation process.

Description

Technical Field

[0001] The present invention relates to the technical field of buffers, and in particular to a linear motor with a buffer function at an extreme position and a power tool using the buffer. Background Art

[0002] As living conditions continue to improve, people's requirements for all aspects of life are getting higher and higher. Therefore, various daily necessities and electrical products used in people's lives are also constantly being innovated. Linear motors are a new type of direct drive technology that has been developed recently. Due to the outstanding advantages of linear motors such as zero transmission chain, no contact, no backlash, high stiffness, and fast response, linear motors are gradually becoming the core functional components of linear motion products.

[0003] In the application of linear power machine derivative products, such as linear power electric tools, civilian tools, etc., it is not a pure pump body, but may be other purely application-type power tools, such as electric picks, curved saws, reciprocating saws, electric files, electric multi-function machines, etc. During the working process of the linear motor, it is necessary to continuously move to the extreme position in the casing. During the high-speed operation process, it often causes a certain impact on the casing, resulting in the overall equipment being easily damaged and having a short lifespan, resulting in poor use effect, and generating great vibration noise.

[0004] Therefore, how to solve the excessive impact of the linear motor on the machine body is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of ordinary linear motor control technology, such as linear motor control technology that does not require a position sensor, or under conditions where the linear motor control technology is not perfect, and to provide a linear motor and power tool with a buffering function at the extreme position.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A linear motor with a buffering function at an extreme position comprises a stator assembly and a mover assembly built into a housing, wherein two ends of the stator assembly are respectively provided with support positioning members coaxial therewith, the mover assembly performs linear reciprocating motion in the stator assembly and the support positioning member, a buffer cavity is provided in the housing or the support positioning member, a piston body is fixedly connected to the mover assembly and moves synchronously therewith, the piston body is slidably arranged in the buffer cavity and divides the buffer cavity into a first cavity and a second cavity, a first air vent and a second air vent are arranged on the side wall of the buffer cavity ring, the first air vent is located in the first cavity, the second air vent is located in the second cavity, and there is a gap between the two; in a first state, the piston body moves between the first air vent and the second air vent, and the air pressure difference between the first cavity and the second cavity is consistent or close; in a second state, when the piston body approaches the extreme position of the first cavity or the second cavity, the piston body blocks the first air vent or the second air vent and compresses the fluid in the first cavity or the second cavity to form an air pressure difference between the two, and the piston body is buffered.

[0008] Preferably, a mover support member is passed through the axis core of the mover assembly, the two move synchronously, and a sliding portion is provided between the mover assembly and the mover support member; a first position and a second position connected to the outside are formed between the two ends of the mover support member and the shell or the positioning support member.

[0009] Preferably, the piston body is arranged at the end of the movable subassembly located at the first position, and the buffer chamber is arranged between the movable subassembly and the first position.

[0010] Preferably, the piston body is arranged at the end of the movable subassembly located at the second position, and the buffer chamber is arranged between the movable subassembly and the second position.

[0011] Preferably, an end face receiving piece is provided at the end of the shell, the supporting positioning piece is partially embedded in the end face receiving piece, the inner wall of the end face receiving piece has a baffle, and the baffle separates the buffer cavity into the first cavity and the second cavity.

[0012] Preferably, the piston body is H-shaped, with its rod passing through the axis of the baffle, and its two ends are slidably disposed in the first cavity and the second cavity respectively, and its end disposed in the first cavity is fixedly connected to the mover support.

[0013] Preferably, the piston body is arranged between two ends of the mover assembly, and the buffer chamber is arranged between the first position and the second position.

[0014] A power tool comprises the linear motor as described above.

[0015] The beneficial effects of the present invention are mainly reflected in:

[0016] 1. A buffer cavity is arranged in the housing or in the supporting positioning member or the end connecting member, and a piston body or a piston-like body is arranged on the movable subassembly so that the piston body slides in the buffer cavity, and two groups of vents are arranged at the extreme positions on the side wall of the buffer cavity, so that under normal conditions, the piston body moves between the two groups of vents without being affected by changes in air pressure, thereby ensuring the normal operation of the movable subassembly and reducing power loss; when the piston body moves to the extreme position, it blocks or exceeds one group of vents, and compresses the fluid in the buffer cavity on one side of the blocked vent to generate a reaction force on the piston body, thereby buffering the piston body; since the piston body and the movable subassembly are fixedly connected, the movement of the piston body is controlled to achieve the purpose of buffering the movement of the movable subassembly to the extreme position, thereby avoiding excessive impact of the movable subassembly on the inside of the housing, reducing noise generation, and extending service life;

[0017] 2. The end of the shell in the first embodiment has a flow hole, and there is a fluid cross-section difference between the flow hole and the flow pipe of the mover support, so that during the movement of the mover assembly, due to the existence of the fluid cross-section difference, there is always fluid flow in the flow hole, thereby continuously dissipating heat, reducing the internal temperature of the mover assembly, and extending the service life;

[0018] 3. There is no need to set up a special buffer structure for the equipment. As far as possible, the structure of the equipment itself, such as the casing or the end, can be used for simple improvement to form a buffer inside the equipment. This can effectively solve the buffer problem in the linear position and minimize the size of the equipment to the greatest extent, with the lowest cost. At the same time, it effectively reduces the requirements of general products for motor control.

[0019] 4. One or more groups of vent holes can be arranged between the first vent hole and the second vent hole as required, so as to maximize the minimum resistance during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 : A schematic diagram of the first embodiment of the present invention in a first state;

[0022] Figure 2 : A schematic diagram of the first embodiment of the present invention in the first extreme position of the second state;

[0023] Figure 3 : A schematic diagram of the first embodiment of the present invention in the second state and the second extreme position;

[0024] Figure 4: A schematic diagram of the second embodiment of the present invention in the first extreme position in the second state;

[0025] Figure 5 : A schematic diagram of the second embodiment of the present invention in the second state and the second extreme position;

[0026] Figure 6 : A schematic diagram of the third embodiment of the present invention in the first extreme position in the second state;

[0027] Figure 7 : Schematic diagram of the third embodiment of the present invention in the second state and the second extreme position. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0029] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply 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 of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0030] This technology is used in the power tool industry, civil tool industry, dust blower, air pump and other industries, some industrial linear working machine fields, such as dust blower, air pump, curved saw, reciprocating saw, electric pick, film machine, multi-function machine, electric file, etc.

[0031] This technical solution is mainly aimed at cylindrical linear motors and electromagnetic linear power machines. AC and DC linear motor drive tools and devices.

[0032] The following is a description of the solution using a cylindrical linear actuator. It is preferred to use a short voice coil linear actuator as the driving force.

[0033] The present invention discloses a linear motor having a buffering function when in an extreme position or close to an extreme position, such as Figures 1 to 3As shown, the first embodiment of the present invention includes a stator assembly 2 and a mover assembly 3 built into a housing 1, and support positioning members 4 coaxial therewith are respectively provided at both ends of the stator assembly 2, and the mover assembly 3 performs linear reciprocating motion in the stator assembly 2 and the support positioning member 4.

[0034] In the preferred embodiment, a buffer chamber 5 is provided in the housing 1. Of course, due to structural requirements, the buffer chamber 5 can also be provided in the support positioning member 4. A piston body 6 is fixedly connected to the mover assembly 3 and moves synchronously therewith. The piston body 6 is slidably provided in the buffer chamber 5 and divides the buffer chamber 5 into a first cavity 501 and a second cavity 502. It is known to those skilled in the art that the shape of the piston body 6 can be a conventional piston head, and can be made of rubber or metal, or a piston-like body. The piston body can be independent, or it can be the mover sliding part itself or the mover support body.

[0035] In this preferred embodiment, the buffer chamber 5 is provided with a first vent hole 503 and a second vent hole 504 on its side wall, and there is a gap between the two. Figure 1 As shown, in the first state, the piston body 6 moves between the first vent hole 503 and the second vent hole 504, the first vent hole 503 is located in the first cavity 501, and the second vent hole 504 is located in the second cavity 502. The air pressure difference between the first cavity 501 and the second cavity 502 is consistent or close.

[0036] like Figure 2 and Figure 3 As shown, in the second state, when the piston body 6 moves close to the limit position of the first cavity 501 or the second cavity 502, the piston body 6 blocks the first vent hole 503 or the second vent hole 504, and compresses the fluid in the first cavity 501 or the second cavity 502, so that a pressure difference is formed between the two, and the piston body 6 is buffered. Of course, in the second state, when the piston body 6 moves close to the limit position of the first cavity 501 or the second cavity 502, the piston body 6 can also exceed the first vent hole 503 or the second vent hole 504, that is, the first vent hole 503 and the second vent hole 504 are in the first cavity 501 or the second cavity 502 at the same time, and then there is no way to communicate with the outside in the corresponding other cavity, thereby generating pressure.

[0037] In the first state, the first vent hole 503 and the second vent hole 504 are both in an open state, so that the air pressure difference between the first cavity 501 and the second cavity 502 is consistent or close. At this time, the piston body 6 normally moves back and forth between the first vent hole 503 and the second cavity 502. The first cavity 501 and the second cavity 502 have no effect on the piston body 6, so that the resistance of the mover assembly 3 is minimized, thereby reducing the power loss of the mover assembly 3 under normal operation and reducing energy consumption. Preferably, one or more groups of vent holes are set between the first vent hole 503 and the second vent hole 504 as needed, which can maximize the minimum resistance during operation.

[0038] In the second state, when the piston body 6 approaches the limit position of the first cavity 501, the first air vent 503 is blocked by the piston body 6, so that the gas in the first cavity 501 is compressed at this time, and the fluid pressure in the first cavity 501 is greater than that in the second cavity 502, so that the fluid in the first cavity 501 produces a reaction force on the piston body 6, hindering the piston body 6 from continuing to move forward, thereby achieving the buffering purpose; or when the piston body 6 moves to the limit position of the second cavity 502, that is, when the second air vent 504 is blocked by the piston body 6, the gas in the second cavity 502 is compressed, making its pressure greater than that of the first cavity 501, thereby hindering the piston body 6 from continuing to move forward, thereby achieving the buffering purpose of the limit position.

[0039] Since the piston body 6 and the mover assembly 3 are fixedly connected as one body, in the second state, the first cavity 501 or the second cavity 502 forms a gas spring structure, which prevents the mover assembly 3 from causing excessive impact on the end of the housing 1, reduces noise generation, and prolongs the service life. In other feasible embodiments, the piston body 6 can also be replaced by other piston-like bodies with piston functions. In other feasible embodiments, the piston body 6 can also move through the first vent hole 503 or the second vent hole 504.

[0040] In order to further improve the buffering effect, a sealing ring 601 is provided on the outer peripheral wall of the piston body 6, and the sealing ring 601 is in sliding contact with the inner wall of the buffer chamber 5. The provision of the sealing ring 601 can ensure the sealing of the first cavity 501 or the second cavity 502 in the second state, and ensure that a relatively large pressure is formed in the first cavity 501 or the second cavity 502 to form a buffering effect. In addition, in the first embodiment, in order to avoid hard contact between the piston body 6 and the cavity wall of the first cavity 501 or the second cavity 502 at the extreme position, rubber rings 602 are also provided on both sides of the piston body 6 to avoid unnecessary wear between the piston body 6 and other components.

[0041] In the present invention, the axis core of the movable subassembly 3 is penetrated by a movable subsupport 7, and the two move synchronously. In order to improve the smoothness of the sliding of the movable subassembly 3 in the supporting positioning member 4, a sliding portion 12 is provided between the movable subassembly 3 and the movable subsupport 7. The sliding portion 12 is fixedly connected to the end of the movable subassembly 3, and the sliding portion 12 is preferably made of wear-resistant material.

[0042] The two ends of the mover support 7 form a first position 8 and a second position 9 connected to the outside with the shell 1. In a preferred embodiment, the shaft core of the mover support 7 is hollow to form a circulation conduit 701, and the circulation conduit 701 is connected to the first position 8 and the second position 9. In the present invention, the first position 8 and the second position 9 can be chambers, or other spaces or shapes connected to the outside. On the one hand, the circulation conduit 701 can increase the fluid capacity of the first position 8 and the second position 9, increase the air pressure difference generated by the linear reciprocating motion of the mover assembly 3, and improve its efficiency; on the other hand, it can effectively reduce the weight of the equipment and the manufacturing cost. Of course, in other feasible embodiments, the mover support 7 can also be a solid structure. The mover support 7 is made of non-magnetic material, such as aluminum alloy, stainless steel, carbon fiber, etc. Aluminum alloy materials are preferred, such as 7075 aluminum alloy, 6061 aluminum alloy, etc.

[0043] In addition, the end of the mover support 7 can be directly or indirectly connected to the working head through the insulating member 13. This is not the focus of the present invention and will not be described in detail.

[0044] In the first embodiment, the piston body 6 is arranged at the end of the mover support 3 located at the first position 8, and the buffer chamber 5 is arranged between the mover support 3 and the first position 8. Such a structural arrangement can minimize the length and volume of the housing 1 to the maximum extent, reduce the overall required space, and adapt to electric tools with a smaller structure.

[0045] Furthermore, a flow hole 101 is provided at the axis of the housing 1 constituting the end of the first position 8, and the aperture of the flow hole 101 is smaller than the diameter of the flow cross section of the flow pipe 701, so that a pressure difference is formed inside and outside the flow hole 101, and the flow hole 101 keeps the fluid flowing as the mover assembly 3 moves. Due to the difference in fluid cross section between the flow hole 101 and the flow pipe 701, the flow hole 101 always has fluid flowing, thereby continuously dissipating heat, reducing the internal temperature of the mover assembly 3, and extending the service life.

[0046] In addition, through holes 102 are evenly distributed on the side walls of the second position 9 and the first position 8, so that the second position 9 and the first position 8 are in fluid communication with the external fluid of the housing 1. In the first embodiment, there is a gap between the end of the support positioning member 4 and the housing 1, so that there is also a fluid cross-section difference between the fluid in the second position 9 and the flow hole 101 and the flow pipe 701, thereby further improving the heat dissipation effect.

[0047] like Figures 4 to 5 The second embodiment of the present invention is shown. The second embodiment has the same general structure as the first embodiment, and the main difference is that in the second embodiment, the specific position of the piston body 6 and the buffer chamber 5 is changed, and the heat dissipation method of the movable subassembly 3 is changed.

[0048] Specifically, the piston body 6 is disposed at the end of the mover support 3 located at the second position 9 , and the buffer chamber 5 is disposed between the mover support 3 and the second position 9 .

[0049] The end of the housing 1 is provided with an end face receiving member 11, and the supporting positioning member 4 is partially embedded in the end face receiving member 11. The inner wall of the end face receiving member 11 has a baffle 1101, and the baffle 1101 divides the buffer chamber 5 into the first chamber 501 and the second chamber 502; the piston body 6 is H-shaped, and its rod passes through the axis of the baffle 1101, and its two ends are respectively slidably arranged in the first chamber 501 and the second chamber 502. In the second embodiment, the rod length of the piston body 6 is greater than the interval between the first vent hole 503 and the second vent hole 504, so that in the first state, the two ends of the piston body 6 move outside the first vent hole 503 and the second vent hole 504, and its state in the second state is the same as that in the first embodiment, and will not be repeated here. This makes the second embodiment applicable to electric tools with a longer travel distance of the mover assembly 3.

[0050] In order to reduce the impact of the end of the piston body 6 on the blocking piece 1101 , a shock-absorbing gasket 14 is provided on the side of the blocking piece 1101 .

[0051] The axial core of the piston body 6 is hollow and connected to the second position 9 and the circulation pipeline 701. The circulation pipeline 701 is connected to the second position 9 and the first position 8 to form an air pump function.

[0052] In addition, a cavity 15 is disposed outside the positioning support 4 , and a through hole 102 is arranged on the side wall of the cavity 15 to increase the heat dissipation efficiency inside the housing 1 , reduce the temperature inside the housing 1 , and increase the service life.

[0053] like Figure 6 and Figure 7 The third embodiment of the present invention is shown. The third embodiment has the same general structure as the first and second embodiments, and the main difference lies in the change of the specific position of the piston body 6 and the buffer chamber 5, and the change of the heat dissipation method of the movable subassembly 3.

[0054] Specifically, in the third embodiment, the structures of the piston body 6 and the buffer chamber 5 are the same as those of the first embodiment, except that the piston body 6 is disposed between the two ends of the mover support 3, and the buffer chamber 5 is disposed between the first position 8 and the second position 9. The working principle of the piston body 6 and the buffer chamber 5 to generate the buffering effect is the same as that of the first embodiment, and will not be described in detail here.

[0055] In the third embodiment, the side walls of the first position 8 and the second position 9 are not provided with the through hole 101, but the side of the mover support 7 is provided with a connecting hole 702 connected to the circulation pipe 701, and the connecting hole 702 is connected to the first cavity 501 or the second cavity 502, so that the linear reciprocating motion of the mover assembly 3 causes an air pressure difference between the inside and outside of the housing 1, realizes the air pump structure, and outputs. In the structure shown in the figure, the connecting hole 702 is connected to the second cavity 502. In other embodiments, the connecting block 702 can have a variety of connection methods, for example, the connecting hole 702 can also be connected to the first cavity 501, or respectively connected to the first cavity 501 or the second cavity 502. In other feasible embodiments, when the mover support 7 is a solid structure, the connecting hole 702 may not be provided, and only the first vent 503 and the second vent 504 are selectively provided in accordance with the first embodiment and the second embodiment to maintain communication with the outside.

[0056] In addition, the first cavity 502 is connected to the gap between the mover assembly 3 and the stator assembly 2, so that the movement of the mover assembly 3 will also drive the flow of the fluid in the gap between the first cavity 502 and the mover assembly 3 and the stator assembly 2, accelerating the heat dissipation in the housing 1 and preventing the temperature in the housing 1 from being too high. Such a structural setting combines buffering and heat dissipation into one, simplifies the equipment structure, reduces manufacturing costs and weight and volume, and prolongs the service life.

[0057] The present scheme further discloses power tools, including housings and other power tools, such as electric picks, jigsaws, reciprocating saws, electric files, electric multi-function machines and other equipment, such as circuit boards, start-stop parts, power supplies and other components. The corresponding power tool structures here are known technologies and will not be elaborated here. The innovation of the power tools of this scheme lies in providing a variety of structures for realizing extreme position buffering functions for some electric tools that need to protect both ends of the housing to prevent the linear motor from moving to the extreme position and excessively impacting the housing, and at the same time providing a structure that can realize heat dissipation, thereby ensuring that sufficient power is maintained during most of the time of use to maintain the normal operation of the entire equipment, reducing the impact on the housing at the extreme position, and reducing the temperature generated during use, thereby extending the service life, noise and reducing unnecessary wear.

[0058] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0059] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A linear motor with a buffering function at an extreme position, comprising a stator assembly (2) and a mover assembly (3) built into a housing (1), wherein two ends of the stator assembly (2) are respectively provided with support positioning members (4) coaxial therewith, and the mover assembly (3) performs linear reciprocating motion within the stator assembly (2) and the support positioning member (4), characterized in that: A buffer chamber (5) is provided in the housing (1); a piston body (6) is fixedly connected to the mover assembly (3) and moves synchronously therewith; the piston body (6) is slidably arranged in the buffer chamber (5) and divides the buffer chamber (5) into a first cavity (501) and a second cavity (502); a first vent hole (503) and a second vent hole (504) are arranged on a side wall of the buffer chamber (5); the first vent hole (503) is located in the first cavity (501), and the second vent hole (504) is located in the second cavity (502). In the first state, the piston body (6) moves between the first vent hole (503) and the second vent hole (504), and the air pressure difference between the first cavity (501) and the second cavity (502) is consistent or close; in the second state, when the piston body (6) moves close to the limit position of the first cavity (501) or the second cavity (502), the piston body (6) blocks or exceeds the first vent hole (503) or the second vent hole (504), and compresses the first cavity (501) or the second cavity (502). The fluid in the first cavity (501) or the second cavity (502) is formed to form a pressure difference between the two, and the piston body (6) is buffered; the axis of the movable subassembly (3) is penetrated by a movable subassembly support (7), and the two move synchronously, and a sliding portion (12) is provided between the movable subassembly (3) and the movable subassembly support (7); a first position (8) and a second position (9) connected to the outside are formed between the two ends of the movable subassembly support (7) and the housing (1); the piston body (6) is arranged at the side of the movable subassembly (3) At an end portion near the first position (8), the buffer chamber (5) is arranged between the mover assembly (3) and the first position (8); a flow hole (101) is arranged at the axis of the housing (1); the axis core of the mover support (7) is hollow to form a flow pipe (701); the aperture of the flow hole (101) is smaller than the diameter of the flow cross section of the flow pipe (701), so that a pressure difference is formed inside and outside the flow hole (101), and the flow of fluid is maintained in the flow hole (101) as the mover assembly (3) moves.

2. A linear motor with a buffering function at an extreme position, comprising a stator assembly (2) and a mover assembly (3) built into a housing (1), wherein two ends of the stator assembly (2) are respectively provided with support positioning members (4) coaxial therewith, and the mover assembly (3) performs linear reciprocating motion within the stator assembly (2) and the support positioning member (4), characterized in that: A buffer chamber (5) is provided in the housing (1); a piston body (6) is fixedly connected to the mover assembly (3) and moves synchronously therewith; the piston body (6) is slidably arranged in the buffer chamber (5) and divides the buffer chamber (5) into a first cavity (501) and a second cavity (502); a first vent hole (503) and a second vent hole (504) are arranged on a side wall of the buffer chamber (5); the first vent hole (503) is located in the first cavity (501), and the second vent hole (504) is located in the first cavity (501). The piston body (6) is in the second cavity (502), and there is a gap between the two; in a first state, the piston body (6) moves between the first vent hole (503) and the second vent hole (504), and the air pressure difference between the first cavity (501) and the second cavity (502) is consistent or close; in a second state, when the piston body (6) moves close to the limit position of the first cavity (501) or the second cavity (502), the piston body (6) blocks or exceeds the first vent hole (503) or the second vent hole (504). , and compresses the fluid in the first cavity (501) or the second cavity (502), so that a pressure difference is formed between the two, and the piston body (6) is buffered; the axis of the movable subassembly (3) is penetrated by a movable subassembly support (7), and the two move synchronously, and a sliding portion (12) is provided between the movable subassembly (3) and the movable subassembly support (7); a first position (8) and a second position (9) connected to the outside are formed between the two ends of the movable subassembly support (7) and the housing (1); the piston body (6) is arranged at The buffer cavity (5) is arranged at the end of the movable subassembly (3) close to the second position (9), and the buffer cavity (5) is arranged between the movable subassembly (3) and the second position (9); the end of the housing (1) is provided with an end surface receiving member (11), the supporting positioning member (4) is partially embedded in the end surface receiving member (11), the inner wall of the end surface receiving member (11) has a baffle (1101), and the baffle (1101) divides the buffer cavity (5) into the first cavity (501) and the second cavity (502).

3. A linear motor with a buffering function at an extreme position according to claim 2, characterized in that: The piston body (6) is H-shaped, with a rod portion passing through the axis of the baffle (1101), and two ends thereof being slidably disposed in the first cavity (501) and the second cavity (502), respectively, and the end portion disposed in the first cavity (501) is fixedly connected to the mover support member (7).

4. A linear motor with a buffering function at an extreme position, comprising a stator assembly (2) and a mover assembly (3) built into a housing (1), wherein two ends of the stator assembly (2) are respectively provided with support positioning members (4) coaxial therewith, and the mover assembly (3) performs linear reciprocating motion within the stator assembly (2) and the support positioning member (4), characterized in that: A buffer chamber (5) is provided in the housing (1); a piston body (6) is fixedly connected to the mover assembly (3) and moves synchronously therewith; the piston body (6) is slidably arranged in the buffer chamber (5) and divides the buffer chamber (5) into a first cavity (501) and a second cavity (502); a first vent hole (503) and a second vent hole (504) are arranged on a side wall of the buffer chamber (5); the first vent hole (503) is located in the first cavity (501), and the second vent hole (504) is located in the first cavity (501). (504) is located in the second cavity (502), and there is a gap between the two; in a first state, the piston body (6) moves between the first vent hole (503) and the second vent hole (504), and the air pressure difference between the first cavity (501) and the second cavity (502) is consistent or close; in a second state, when the piston body (6) moves close to the limit position of the first cavity (501) or the second cavity (502), the piston body (6) blocks or exceeds the first vent hole (503). 3) or the second vent hole (504), and compresses the fluid in the first cavity (501) or the second cavity (502), so that a pressure difference is formed between the two, and the piston body (6) is buffered; a movable support member (7) is passed through the shaft core of the movable subassembly (3), and the two move synchronously, and a sliding portion (12) is provided between the movable subassembly (3) and the movable support member (7); a first position (8) communicating with the outside is formed between the two ends of the movable support member (7) and the housing (1) and a second position (9); the piston body (6) is arranged between the two ends of the mover assembly (3), and the buffer chamber (5) is arranged between the first position (8) and the second position (9); the shaft core of the mover support (7) is hollow to form a circulation pipeline (701), and a connecting hole (702) connected to the circulation pipeline (701) is provided on the side of the mover support (7), and the connecting hole (702) is connected to the first cavity (501) or the second cavity (502).

5. A power tool, characterized in that: It comprises a linear motor as described in any one of claims 1-4.

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