Power tool

Abstract

A power tool, comprising: a cylinder, which is at least partially arranged in a housing. Gas is stored in the cylinder. The cylinder comprises: an inflation nozzle, through which the cylinder is pre-filled with gas; an inflating valve, through which the gas filled by the inflation nozzle flows and then enters the cylinder; and a pressure relief valve, which is arranged between the inflation nozzle and the inflation valve. When the pressure of the gas filled by the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.

Description

power tools

[0001] This application claims priority to the Chinese patent application with application number 202311267443.2 filed with the China Patent Office on September 27, 2023, priority to the Chinese patent application with application number 202311261298.7 filed with the China Patent Office on September 27, 2023, priority to the Chinese patent application with application number 202311257589.9 filed with the China Patent Office on September 27, 2023, priority to the Chinese patent application with application number 202322645843.4 filed with the China Patent Office on September 27, 2023, and priority to the Chinese patent application with application number 202322645506.5 filed with the China Patent Office on September 27, 2023. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to a tool, for example, to a power tool with a cylinder. Background Art

[0003] The nail gun in the related technology is a nailing tool. The principles of nail gun products on the market can be divided into mechanical and cylinder types. Among them, mechanical nail guns can be divided into spring type, flywheel type, friction wheel type and other structures according to the energy storage method; cylinder nail guns can be divided into single-cylinder or double-cylinder structures according to the number of cylinders, and can be divided into positive pressure or negative pressure storage according to the energy storage method.

[0004] In related art, cylinder nail guns compress the gas within the cylinder, which pushes out the firing assembly and drives the nail. Pre-filled nail guns pre-fill the air through the nozzle, eliminating the need for an external air pressure source. During the inflation process, the cylinder, nozzle, and components within the cylinder are susceptible to damage from excessive pressure.

[0005] This section provides background information related to the present application which is not necessarily prior art.

[0006] Summary of the Invention

[0007] One object of the present application is to solve or at least alleviate a part or all of the above problems. To this end, one object of the present application is to provide a power tool that can protect cylinder components.

[0008] In order to achieve the above objectives, this application adopts the following technical solutions:

[0009] In the first aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output part, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, driven by the power output part, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; wherein the cylinder comprises: an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; an inflation valve, the gas filled in by the inflation nozzle flows through the inflation valve and then enters the cylinder; a pressure relief valve, disposed between the inflation nozzle and the inflation valve, and when the pressure of the gas filled in the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.

[0010] In some embodiments, the pressure relief valve is unidirectional.

[0011] In some embodiments, the inflation valve is one-way.

[0012] In some embodiments, the inflation valve restricts gas within the cylinder from flowing out of the cylinder through the inflation valve.

[0013] In some embodiments, the inflation valve restricts gas from entering the cylinder when the pressure within the cylinder exceeds a second predetermined pressure.

[0014] In some embodiments, the first preset pressure is less than or equal to the second preset pressure.

[0015] In some embodiments, the cylinder includes: a cylinder portion, which is provided with a cavity, and the cavity is configured to store gas; and an inflation portion, which is connected to the cavity via an inflation valve.

[0016] In some embodiments, the inflation portion includes a gas channel portion, the inflation nozzle and the inflation valve are arranged at both ends of the gas channel portion, and the pressure relief valve is arranged on the gas channel portion.

[0017] In some embodiments, when the pressure relief valve and the inflation valve are in a closed state, the gas pressure in the gas channel is greater than or equal to atmospheric pressure.

[0018] In some embodiments, the gas channel portion forms a second gas cavity, the second gas cavity has a certain length, and the pressure relief valve releases gas along a direction intersecting with the length direction of the second gas cavity.

[0019] In some embodiments, the cylinder includes an inner cylinder in which the piston moves.

[0020] In some embodiments, the cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle, the inflation valve and the pressure relief valve are respectively arranged on the outer cylinder.

[0021] In some embodiments, the outer sidewall of the inner cylinder is provided with a first thread segment and the inner sidewall of the outer cylinder is provided with a second thread segment, and the first thread segment is engaged with the second thread segment.

[0022] In some embodiments, the shell includes an inflation hole corresponding to the inflation nozzle; and further includes a retaining member configured to fix the cylinder, the retaining member including a positioning portion, the positioning portion being at least partially disposed on the cylinder, the positioning portion indicating the position where the inflation nozzle and the inflation hole are assembled.

[0023] In some embodiments, the positioning portion includes a first indication structure, and a second indication structure is provided on the cylinder. When the first indication structure and the second indication structure satisfy a preset relationship, the cylinder is fixed at a preset position so that the inflation nozzle corresponds to the inflation hole.

[0024] On the second aspect, an embodiment of the present application provides a power tool, including: a housing; a power output part, at least partially arranged in the housing; a cylinder, at least partially arranged in the housing; gas stored in the cylinder; a piston, driven by the power output part, the piston is arranged in the cylinder and moves in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; a one-way pressure relief valve, arranged on the downstream side of the inflation of the inflation nozzle, and the one-way hydraulic valve conducts the escaping gas to the outside of the cylinder.

[0025] On the third aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output part, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, driven by the power output part, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; the cylinder comprising: an inflation nozzle, the cylinder being pre-filled with gas through the inflation nozzle; the inflation nozzle limiting the release of gas from the inflation nozzle; a one-way pressure relief valve, disposed on the inflation downstream side of the inflation nozzle, and when the pressure of the inflation gas in the inflation nozzle is greater than a first preset pressure, the inflation gas is released through the one-way pressure relief valve.

[0026] In some embodiments, the cylinder includes an inner cylinder in which the piston moves.

[0027] In some embodiments, the cylinder further includes an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle and the one-way pressure relief valve are respectively arranged on the outer cylinder.

[0028] In some embodiments, the outer sidewall of the inner cylinder is provided with a first thread segment and the inner sidewall of the outer cylinder is provided with a second thread segment, and the first thread segment is engaged with the second thread segment.

[0029] In a fourth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a motor, at least partially disposed in the housing; a circuit board assembly, electrically connected to the motor to control the motor; the circuit board assembly comprising a first heat dissipation portion, the first heat dissipation portion being at least partially in thermal contact with a circuit board on which a controller is provided; a second heat dissipation portion, disposed outside the circuit board assembly, the second heat dissipation portion comprising a core portion and an outer shell portion having heat dissipation capability; the core portion comprising at least a phase change material; a heat conducting portion, connecting the circuit board assembly and the second heat dissipation portion so that the circuit board assembly and the second heat dissipation portion are in thermal contact.

[0030] In some embodiments, the core undergoes a phase change reaction at a predetermined temperature to cool the shell.

[0031] In some embodiments, the preset temperature is lower than the temperature of the first heat dissipation portion.

[0032] In some embodiments, the housing portion comprises a metallic material.

[0033] In some embodiments, the outer shell forms an openable and closable sealed cavity, and the core is accommodated in the sealed cavity.

[0034] In some embodiments, the heat conducting portion includes a metal material.

[0035] In some embodiments, the heat conducting portion connects the first heat dissipating portion and the outer shell portion.

[0036] In some embodiments, the first heat dissipation portion includes a fin heat dissipation structure.

[0037] In some embodiments, the first heat dissipation portion includes at least a phase change material.

[0038] In the fifth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a heat generating component, at least partially disposed in the housing; the heat generating component generates a temperature rise when the power tool is running; a first heat dissipation portion, the first heat dissipation portion being at least partially in thermal contact with the heat generating component; a second heat dissipation portion, disposed outside the heat generating component, the second heat dissipation portion comprising a core portion and an outer shell portion with heat dissipation capability; the core portion at least comprises a phase change material; a heat conducting portion, connecting the heat generating component and at least one of the first heat dissipation portion and the second heat dissipation portion to bring the heat generating component and the second heat dissipation portion into thermal contact.

[0039] In the sixth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output part, at least partially arranged in the housing; a cylinder, at least partially arranged in the housing; gas stored in the cylinder; a piston, arranged in the cylinder and driven by the power output part and moving in the cylinder to compress the gas in the cylinder; the cylinder comprising: a first cavity, the piston moves in the first cavity; a second cavity, the second cavity is connected to the first cavity; an adjusting assembly, the adjusting assembly includes a first state and a second state, when the position of the piston in the first cavity is the same, when the adjusting assembly is in the first state, the first cavity and the second cavity limit a first effective volume; when the adjusting assembly is in the second state, the first cavity and the second cavity limit a second effective volume; the first effective volume is smaller than the second effective volume.

[0040] In some embodiments, the defined volume of the first cavity is related to the travel position of the piston.

[0041] In some embodiments, the defined volume of the first cavity is independent of the state of the regulating assembly.

[0042] In some embodiments, the adjustment assembly is at least partially disposed within the second cavity, and a defined volume of the second cavity is related to a state of the adjustment assembly.

[0043] In some embodiments, the adjustment assembly includes: an operating member driven to switch the working state of the adjustment assembly; and an adjustment piston driven by the operating member to move within the second cavity.

[0044] In some embodiments, the adjusting piston and the inner wall of the second cavity define the volume of the second cavity.

[0045] In some embodiments, the adjustment assembly further includes a connecting portion connecting the operating member and the adjustment piston, the connecting portion being driven by the operating member to move the adjustment piston and maintaining the position of the adjustment piston when the operating member is released.

[0046] In some embodiments, a sealing ring is provided on the outer side of the regulating piston.

[0047] In some embodiments, the power tool further includes: a firing pin, disposed on the piston, configured to drive out a nail; and a driving member, driven by the power output portion to cooperate with the firing pin to drive the piston to move in the cylinder and compress the gas.

[0048] In the seventh aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output part, at least partially arranged in the housing; a cylinder, at least partially arranged in the housing; gas stored in the cylinder; a firing assembly, at least partially arranged in the cylinder, capable of moving from a storage position to a firing position in the cylinder to drive a nail; the cylinder comprising: a first cavity, the firing assembly moves in the first cavity; a second cavity, the second cavity is connected to the first cavity; an adjusting assembly, the adjusting assembly comprises a first state and a second state, when the same volume of gas is filled in the cylinder, the striking force applied by the firing assembly to the nail when the adjusting assembly is in the first state is greater than the striking force applied by the firing assembly to the nail when the adjusting assembly is in the second state.

[0049] In the eighth aspect, an embodiment of the present application provides a power tool, including: a shell; a power output part, at least partially arranged in the shell; a cylinder, at least partially arranged in the shell; gas is stored in the cylinder; a piston, arranged in the cylinder, driven by the power output part and moved in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; the shell includes an inflation hole corresponding to the inflation nozzle; a retaining member, configured to fix the cylinder; the retaining member includes a positioning part, the positioning part includes a first indication structure, and a second indication structure is provided on the cylinder. When the first indication structure and the second indication structure meet a preset relationship, the cylinder is fixed at a preset position so that the inflation nozzle corresponds to the inflation hole.

[0050] In some embodiments, the cylinder includes an inner cylinder in which the piston moves; and an outer cylinder disposed around the inner cylinder, the inner cylinder and the outer cylinder are in communication, and a retaining member connects the inner cylinder and the outer cylinder.

[0051] In some embodiments, the inner cylinder and the outer cylinder are connected by rotation, and the positioning portion indicates the rotation end point of the outer cylinder.

[0052] In some embodiments, the retaining member includes a first thread segment disposed on an outer sidewall of the inner cylinder and a second thread segment disposed on an inner sidewall of the outer cylinder, the first thread segment being engaged with the second thread segment.

[0053] In some embodiments, the retaining member further comprises a retaining ring disposed on the outside of the outer cylinder, the retaining ring limiting engagement and disengagement between the first thread segment and the second thread segment.

[0054] In some embodiments, the first indicator structure is formed on or attached to the retaining ring.

[0055] In some embodiments, the retaining member further includes a support seat, which is fixed to the inner cylinder and positions the inner cylinder and the housing.

[0056] In some embodiments, the first indicator structure is formed on or connected to the support base.

[0057] In some embodiments, it also includes a firing pin, which is arranged on the piston and is configured to drive out a nail, and the firing pin extends out of the cylinder; and a dustproof part, which is arranged at the position where the firing pin extends out of the cylinder to limit dust on the firing pin from entering the cylinder.

[0058] In the ninth aspect, an embodiment of the present application provides a power tool, including: a housing; a power output part, at least partially arranged in the housing; a cylinder, at least partially arranged in the housing; gas stored in the cylinder; a piston, arranged in the cylinder, driven by the power output part and moving in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; the housing includes an inflation hole corresponding to the inflation nozzle; a retaining member, configured to fix the cylinder; the retaining member includes a positioning part, the positioning part is at least partially arranged on the cylinder, and the positioning part indicates the assembly position of the inflation nozzle and the inflation hole.

[0059] In the tenth aspect, an embodiment of the present application provides a nail gun, comprising: a shell; a power output part, at least partially disposed in the shell; a firing assembly, which moves from a storage position to a firing position to drive a nail; the firing assembly comprises a first lifting part; a driving member, driven by the power output part; the driving member is configured to drive the firing assembly so that the firing assembly moves from the firing position to the storage position; the driving member comprises a first driving part, the first driving part engages with the first lifting part to enable the firing assembly to move from the firing position to the storage position; the first driving part comprises: a first avoidance part configured to avoid the second lifting part below the first lifting part.

[0060] In some embodiments, the firing assembly further includes: a third lifting portion, the third lifting portion is provided with a first rotating shaft, the first rotating shaft is provided with a roller, and the roller rotates around the first rotating axis.

[0061] In some embodiments, the radius of the roller is greater than or equal to the length of a connecting line between the tooth top of the third lifting portion and the axis of the first rotating shaft.

[0062] In some embodiments, the width of the first lifting portion is greater than the width of the first avoiding portion, and the width of the second lifting portion is less than or equal to the width of the first avoiding portion.

[0063] In some embodiments, a second rotating shaft is provided on the first lifting portion, a roller is provided on the second rotating shaft, and the roller rotates around the second rotating axis.

[0064] In some embodiments, the driving member further includes a second driving portion, the second driving portion engages with a second lifting portion below the first lifting portion, and a width of the second driving portion is substantially the same as a width of the first driving portion.

[0065] In some embodiments, the driving member includes a third driving portion cooperating with the third lifting portion, and the wall surface of the third driving portion in contact with the roller is a smooth surface.

[0066] In some embodiments, the nail gun further includes: a cylinder configured to store gas; a firing assembly including: a piston located in the cylinder; a firing pin disposed on the piston; a first lifting portion, a second lifting portion, and a third lifting portion disposed on the firing pin to enable the piston to move in the cylinder.

[0067] In some embodiments, the first lifting portion, the second lifting portion, and the third lifting portion are sequentially arranged from near to far from the piston.

[0068] In some embodiments, the first avoidance portion is configured to allow the second lifting portion to pass through or over the first driving portion along the moving direction of the firing assembly.

[0069] In some embodiments, the first avoidance portion is configured as a groove on the first driving portion extending along the moving direction of the firing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] FIG1 is a perspective structural diagram of a nail gun according to an embodiment of the present application;

[0071] FIG2 is a partial cross-sectional view of the nail gun of FIG1 ;

[0072] FIG3 is a cross-sectional view of portions of FIG1 showing the motor, transmission, and fan assembly;

[0073] FIG4 is a cross-sectional view of portions of FIG1 showing the cylinder and firing assembly, wherein the firing assembly is in a fired position;

[0074] FIG5 is a cross-sectional view of portions of FIG1 showing the cylinder and firing assembly, wherein the firing assembly is in a charged position;

[0075] FIG6 is a perspective structural diagram of some components in FIG1 , showing a power output portion and a firing assembly, wherein the firing assembly is in a firing position;

[0076] FIG7 is a partial cross-sectional view of FIG6;

[0077] FIG8 is a perspective structural diagram of some components in FIG1 , showing the power output portion and the firing assembly, wherein the firing assembly is in an energy storage position;

[0078] FIG9 is a schematic diagram of the structure of the driving member and the striker in FIG6;

[0079] FIG10 is a cross-sectional view of BB in FIG9

[0080] FIG11 is an enlarged cross-sectional view of some components in FIG4;

[0081] FIG12 is an exploded view of some components of FIG11;

[0082] FIG13 is a schematic diagram of another cylinder structure;

[0083] FIG14 is a schematic diagram of another cylinder structure and another inflation nozzle structure;

[0084] FIG15 is a schematic structural diagram of some components of FIG2 from another perspective;

[0085] FIG16 is a partial enlarged view of portion I in FIG4;

[0086] 17 is a partial cross-sectional view of the cylinder portion of a nail gun according to an embodiment of the present application, showing a dustproof structure;

[0087] 18 is a partial cross-sectional view of another portion of the cylinder of a nail gun according to an embodiment of the present application, showing a lubrication compensation assembly;

[0088] FIG19 is a partial cross-sectional view of a nail gun according to an embodiment of the present application, showing a circuit board assembly and a second heat dissipation portion;

[0089] FIG20 is a structural diagram of some components from another perspective in FIG19;

[0090] 21 is a partial cross-sectional view of the cylinder portion of a nail gun according to another embodiment of the present application, wherein the adjustment assembly is in a second state;

[0091] 22 is a partial cross-sectional view of a cylinder portion of a nail gun according to another embodiment of the present application, wherein the adjustment assembly is in a first state;

[0092] FIG23 is a partial perspective view of the cylinder portion of a nail gun according to another embodiment of the present application;

[0093] FIG24 is a schematic diagram of an electrical structure diagram of any embodiment in the present application. DETAILED DESCRIPTION

[0094] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0095] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0096] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0097] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0098] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, %, 1% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, degree, 1 degree or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0099] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0100] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0101] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0102] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0103] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0104] In order to clearly illustrate the technical solution of the present application, the upper side, lower side, left side, right side, front side and rear side are defined in the drawings of the specification.

[0105] FIG1 shows a power tool according to an embodiment of the present application. In this embodiment, the power tool is a nail gun 100. In some embodiments, the power tool may also include a gas spring power tool such as a glue gun or a stapler.

[0106] As shown in Figures 1 and 2, the nail gun 100 includes a housing 11, a power output unit 12, a cylinder 13, and a magazine assembly 14. The housing 11 includes a first accommodating space 11a extending along a first straight line 101 and a second accommodating space 11b extending along a second straight line 102. The power output unit 12 is disposed within the first accommodating space 11a, and the cylinder 13 is disposed within the second accommodating space 11b. The first straight line 101 intersects the second straight line 102. In this embodiment, the first straight line 101 and the second straight line 102 are substantially perpendicular to each other.

[0107] The housing 11 is also formed with a handle portion 113 for the user to hold. One end of the handle portion 113 is connected to a power interface, which is configured to connect to a DC or AC power source. In this embodiment, the nail gun 100 is powered by a DC power supply. Optionally, the DC power supply is a battery pack 30, and the battery pack 30 cooperates with a corresponding power supply circuit to power the components in the nail gun 100. The battery pack 30 is detachably connected to the handle portion 113. Those skilled in the art should understand that the power supply is not limited to the scenario of using the battery pack 30, and can also be powered by AC power, AC power, or a mixture of AC power and battery pack 30, in conjunction with corresponding rectification, filtering and voltage regulation circuits to achieve power supply to each circuit component.

[0108] A main switch 31 is provided on the handle portion 113 , and a user controls the start and stop of the nail gun 100 through the main switch 31 .

[0109] The clip assembly 14 is disposed in the direction of the third straight line 103. The clip assembly 14 holds fasteners (e.g., nails, tacks, staples, etc.) to allow the user to perform multiple fastening operations without having to manually reload the fastener driver after each actuation cycle. In some embodiments, the clip assembly 14 can accommodate fasteners of multiple types or lengths.

[0110] As an optional embodiment, the clip assembly 14 is further provided with a window 141 for the user to observe the remaining nails. The window 141 is configured as one or more notches on the clip assembly 14. On the one hand, it allows the user to check the remaining nails, and on the other hand, it allows the user to perform simple maintenance on the clip assembly 14 without disassembling the clip assembly 14.

[0111] As shown in Figure 3, the power output unit 12 includes a motor 121, a transmission assembly 122, an output shaft 125, and a drive member 17. In this embodiment, the motor is specifically an electric motor 121. In the subsequent description, the electric motor 121 will be used instead of the motor, but this does not limit the present application. The motor 121 can output power to the transmission assembly 122. After the transmission assembly 122 changes speed, it continues to output power to the output shaft 125. The drive member 17 is disposed on the output shaft 125. Specifically, the motor 121, transmission assembly 122, output shaft 125, and drive member 17 are all arranged along the first straight line 101. The transmission assembly 122 is provided with a speed change mechanism. In this embodiment, the transmission assembly 122 includes a first planetary gear set 1221, a second planetary gear set 1222, and a third planetary gear set 1223. In some alternative embodiments, the transmission assembly also includes a check assembly. The check assembly is disposed in the transmission assembly 122 and is positioned at one end or in the middle of the speed change mechanism. As an implementation manner, the anti-return assembly enables the output shaft 125 to output a driving force only in a first rotation direction, and limits the rotation of the output shaft 125 in a second rotation direction opposite to the first rotation direction.

[0112] As shown in Figures 4 and 5, a firing assembly 15 is disposed within the air cylinder 13, and work is performed by the gas within the air cylinder 13. The gas within the air cylinder 13 propels the firing assembly 15 to move, thereby driving fasteners (e.g., nails, tacks, staples, etc.) held within the magazine assembly 14 into a workpiece. In this embodiment, the air cylinder 13 further includes a gas filling nozzle 135 configured to pre-fill the air cylinder 13 with gas.

[0113] During a nailing cycle, the power output unit 12 drives the driving member 17 to rotate and then drives the firing assembly 15 to move between the firing position (bottom dead center, as shown in Figures 4, 6 and 7) and the energy storage position (top dead center, as shown in Figures 5 and 8). By energizing the motor 121, the driving member 17 drives the firing assembly 15 from the firing position to the energy storage position, and the firing assembly 15 compresses the gas in the cylinder 13. When in the energy storage position, the firing assembly 15 and the driving member 17 are held in place, and the compressed gas continues to push the firing assembly 15 to give it an acceleration until a trigger instruction representing the user to start nailing is received, at which time the holding force of the firing assembly 15 is released. After the holding force is released, the gas compressed by the firing assembly 15 drives the firing assembly 15 to the firing position, thereby driving the nail into the workpiece.

[0114] As shown in Figures 4 to 9, the firing assembly 15 includes a striker 16 and a piston 151. The striker 16 is mounted on the piston 151. The piston 151 is disposed within the cylinder 13 and is driven by the power output unit 12 to move within the cylinder 13 to compress the gas within the cylinder 13. The driver 17 drives the striker 16, causing the piston 151 to move within the cylinder 13 along the second straight line 102, thereby moving the firing assembly 15 from the firing position to the energy storage position.

[0115] In this embodiment, the striker 16 is provided with a transmission tooth 16a, and the driver 17 is provided with a drive tooth 17a that engages with the transmission tooth 16a. In some embodiments, the striker 16 and the driver 17 are provided with a protrusion and a recess that engage with each other. Optionally, the recess may be a groove, a blind hole, or a through-hole structure. Optionally, the mutual cooperation structure between the striker 16 and the driver 17 may also include a magnetic attraction structure or similar structures that attract each other.

[0116] When the firing assembly 15 drives out a nail, the firing assembly 15 may not fully move to the firing position (bottom dead center) due to some reasons. In the process of the firing assembly 15 continuing to move, a collision will be caused between the firing pin 16 and the driving member 17, thereby wearing the driving teeth 17a of the driving member 17 and / or the transmission teeth 16a on the firing pin 16. Among them, "some reasons" include: the workpiece into which the nail is driven is too hard, so that the rebound force of the striking object, i.e. the nail, causes the firing assembly 15 to rebound a short distance upward from the firing position. Optionally, "some reasons" may also include: the striking force of the firing assembly 15 on the nail is insufficient, so that the nail cannot enter the workpiece with a preset length, resulting in the firing pin 16 being unable to reach the bottom dead center position. At this time, if the driving member 17 and the firing pin 16 come into contact and engage, misalignment will occur between the firing pin 16 and the driving member 17, resulting in a collision or stall. In order to solve the above problems, the present application optimizes the structure of the driving member 17 and the firing pin 16 to avoid the wear of the driving teeth 17a and the transmission teeth 16a caused by the collision between the firing pin 16 and the driving member 17.

[0117] In this embodiment, the driver 17 is configured as a drive wheel with the first straight line 101 as its axis of rotation. The driver 17 includes a main body 171 surrounding the driver 17. The main body 171 is formed with a plurality of drive teeth 17a. The drive teeth 17a include a first drive portion 172 positioned at the starting end. The striker 16 is configured as a rack with the second straight line 102 as its length. The striker 16 is provided with drive teeth 16a perpendicular to the second straight line 102. The drive teeth 16a include a first lifting portion 161. The first drive portion 172 engages with the first lifting portion 161 to move the firing assembly 15 from the firing position to the charging position. It will be understood that the first drive portion 172 is the first drive tooth of the driver 17. The first lifting portion 161 is the first drive tooth. When the driver 17 begins to drive the firing assembly 15 from the firing position to the charging position, the first contact between the driver 17 and the striker 16 is with the first drive portion 172 and the first lifting portion 161. It should be explained that "the first contact between the driving member 17 and the striker 16 is the first driving part 172 and the first lifting part 161" is a theoretical design and the driving tooth 17a and the transmission tooth 16a that should be contacted first when the machine is working normally are configured as the first driving part 172 and the first lifting part 161 respectively. The situation that occurs in a fault state or an abnormal state does not fall within the content of this section. Among them, the first driving part 172 includes a first avoidance part 173 configured to avoid the second lifting part 162 below the first lifting part 161. Among them, the second lifting part 162 is configured as other lifting parts in addition to the first lifting part 161. In this application, the transmission teeth on the transmission teeth 16a other than the first lifting part 161 are collectively referred to as the second lifting part 162. It can be understood that any transmission tooth on the transmission tooth 16a other than the first lifting part 161 can also be regarded as the second lifting part 162, and it is not required that any transmission tooth other than the first lifting part 161 is the second lifting part 162.

[0118] When the firing assembly 15 is fully moved to the firing position (bottom dead center), the first drive portion 172, or the first drive tooth, is positioned between one of the drive teeth 16a in the first and second lifting portions 161, 162. When the next nailing cycle begins, the first drive tooth 17a engages with the first lifting portion 161, thereby pushing the first lifting portion 161 upward. If the firing assembly 15 is not fully moved to the firing position, either the firing pin 16 rebounds or fails to fall into place, the first drive tooth 17a may contact or collide with the second lifting portion 162. The present application provides a first clearance portion 173 on the first drive portion 172 that allows the second lifting portion 162 to pass through. The first clearance portion is configured to allow the second lifting portion to pass through or past the first drive portion along the direction of movement of the firing assembly, thereby preventing collision or wear between the first drive portion 172 and the second lifting portion 162. This improves the service life of the driver 17 and firing pin 16, thereby enhancing the service life and safety of the nail gun 100.

[0119] The driving member 17 is also formed with a connecting hole 1713 for connecting the output shaft 125. When the output shaft 125 is connected to the connecting hole 1713, the driving member 17 can rotate synchronously with the output shaft 125. The driving member 17 also includes a second driving portion 175, wherein the second driving portion 175 is configured as a driving portion other than the first driving portion 172. In this application, the driving teeth 17a on the driving teeth 17a other than the first driving portion 172 are collectively referred to as the second driving portion 175. The first driving portion 172 and the second driving portion 175 are evenly distributed within the first section 1711 of the driving member 17. The second driving portion 175 engages with the second lifting portion 162 below the first lifting portion 161. In order to ensure stable engagement between the driving member 17 and the striker 16, the first avoidance portion 173 is not provided on the second driving portion 175. The axial direction of the driving member 17 is defined as the width direction of the driving member 17, and the width of the second driving portion 175 is substantially the same as the width of the first driving portion 172.

[0120] The driver 17 also includes a second section 1712. This second section 1712 is smooth and continuous, and lacks the drive teeth 17a. As shown in Figure 8, when the drive teeth 17a of the first section 1711 engage with the transmission teeth 16a on the striker 16, the driver 17 can drive the striker 16, causing the piston 151 to compress the gas in the cylinder 13 to produce work. When the second section 1712 engages the striker 16, due to its smooth and continuous nature, the striker 16, without the drive teeth 17a blocking it, is rapidly pushed out by the gas in the cylinder 13, thereby achieving the desired nailing effect.

[0121] As shown in Figures 8 to 10 , the width H2 of the first lifting portion 161 is greater than the width H3 of the first relief portion 173, while the width H4 of the second lifting portion 162 is less than or equal to the width H3 of the first relief portion 173. In other words, the width of the first lifting portion 161 is greater than the width of the second lifting portion 162. In this embodiment, the first relief portion 173 is configured as a slot 1731 extending in the direction of movement of the firing assembly 15 on the first driving portion 172. Specifically, the first relief portion 173 is a slot 1731 extending longitudinally along the second straight line 102. The slot 1731 extends circumferentially through the first driving portion 172. The slot 1731 has an opening on one side of the slot 1731 near the first lifting portion 161, thereby forming an escape passage for the second lifting portion 162 to pass along the direction of movement of the firing assembly (in this embodiment, the vertical direction).

[0122] In some embodiments, the first relief portion 173 can be a shortened or thinned portion of the first driving portion 172. In other words, the specific structure of the first relief portion can be adapted to suit the specific configurations of the driving member 17 and the striker 16. Therefore, any structure of the first relief portion 173 that allows the second lifting portion 162 to be avoided by the first driving portion 172 complies with the basic principles and key features of the application.

[0123] In this embodiment, the first lifting portion 161 includes a second rotating shaft 1611, which is equipped with a roller 164. The roller 164 rotates about a second rotation axis. The second rotating shaft 1611 is fixedly connected to the first lifting portion 161 or integrally formed with the first lifting portion 161. The second rotating shaft 1611 is arranged on both sides of the tooth surface of the first lifting portion 161, and the roller 164 can freely rotate about the second rotating shaft 1611. The roller 164 is arranged on both sides of the teeth of the first lifting portion 161 to ensure the width of the first lifting portion 161.

[0124] The firing pin 16 also includes a third lifting portion 163. The first lifting portion 161, the second lifting portion 162, and the third lifting portion 163 are arranged in order from near to far from the piston 151. During the aforementioned nailing cycle, the driver 17 rotates in a first direction to drive the firing assembly 15 until the last tooth of the drive teeth 17a on the driver 17 engages with the lowest transmission tooth 16a of the transmission teeth 16a. The firing assembly 15 is in the energy storage position. In other words, when the last tooth of the drive teeth 17a engages with the lowest teeth of the transmission teeth 16a, the firing assembly 15 is in the top dead center position. At this point, the firing assembly 15 and the driver 17 are held in place, and the nail gun 100 enters the cocking phase. At this point, the retaining force of the firing assembly 15 is released, meaning that the driver 17 continues to rotate, reaching the second section 1712, at which point the drive teeth 17a disengage from the transmission teeth 16a. The third lifting portion 163 is configured as the lowest tooth of the firing pin 16. The teeth on the driver 17 that engage with the third lifting portion 163 are the third driver 176. When the nail gun 100 is in the cocked state (i.e., when the firing assembly 15 and the driver 17 are held in place), the third driver 176 and the third lifting portion 163 are only engaged via a contact surface, not true tooth-to-tooth engagement. In this situation, the third lifting portion 163 must withstand the force accumulated in the cylinder 13 of the nail gun 100 in the cocked state. Furthermore, at the moment of release, rolling friction occurs between the third driver 176 and the third lifting portion 163, further increasing wear on the third lifting portion 163. To reduce wear on the third lifting portion 163, a rolling friction member is provided on the third lifting portion 163.

[0125] In this embodiment, the third lifting portion 163 includes a first rotating shaft 1621, on which a roller 164 is disposed, which rotates about a first rotating axis. The radius R1 of the roller 164 is greater than or equal to the length H1 of a line connecting the tooth tips of the teeth of the third lifting portion 163 and the axis of the first rotating shaft 1621. The wall surface where the third driving portion 176 contacts the roller 164 is a smooth surface 1761. The first rotating shaft 1621 is fixedly connected to or integrally formed with the third lifting portion 163. The first rotating shaft 1621 is disposed on both sides of the tooth surface of the teeth of the third lifting portion 163, and the roller 164 can freely rotate about the first rotating shaft 1621. When the nail gun 100 is in the cocked state, the third driving portion 176 is actually engaged with the roller 164 and generates a force by squeezing the roller 164. When the nail gun 100 is in a firing state, rolling friction is generated between the third driving portion 176 and the roller 164 , thereby greatly reducing the interaction force between the two and alleviating the wear of the third lifting portion 163 .

[0126] Regarding the installation of the striker 16 and the piston 151, in this embodiment, the piston 151 includes a metal part 1511, a first rubber ring 1513 and a second rubber ring 1514. Among them, the metal part 1511 is configured as the main structure of the piston 151 to support the overall structure of the piston 151 and provide sufficient strength. The striker 16 is fixed on the metal part 1511. The first rubber ring 1513 and the second rubber ring 1514 are sleeved on the outside of the metal part 1511. The first rubber ring 1513 and the second rubber ring 1514 respectively form contact with the inner wall of the cylinder 13. It can be understood that the first rubber ring 1513 and the second rubber ring 1514 respectively form a seal with the inner wall of the cylinder 13 to achieve the function of compressing the piston 151.

[0127] As shown in Figures 4, 11, and 12, the cylinder 13 includes a barrel portion 133 configured to store gas. The barrel portion 133 is provided with a cavity that stores gas. A piston 151 moves within the barrel portion 133, compressing the gas to perform work. The cylinder 13 is pre-charged with gas via an inflation nozzle 135, eliminating the need for an external air pressure source. In this embodiment, the cylinder 13 also includes a charging valve 137 and a pressure relief valve 138. Gas introduced by the inflation nozzle 135 flows through the charging valve 137 and enters the cylinder 13 (i.e., the cavity of the barrel portion 133). The pressure relief valve 138 is disposed between the inflation nozzle 135 and the charging valve 137. As will be appreciated, the pressure relief valve 138 is unidirectional and restricts gas from entering the cylinder 13. The one-way pressure relief valve 138 is disposed downstream of the inflation nozzle 135, allowing gas to escape. When the pressure of the gas injected into the inflation nozzle 135 exceeds a first preset pressure, the gas is released through the one-way pressure relief valve 138. When pre-inflating the cylinder 13, excessive pressure can damage the cylinder 13. Therefore, a pressure relief valve 138 is provided behind the inflation nozzle 135. This allows the gas to be released to the outside when the pressure exceeds the first preset pressure, thereby protecting the cylinder 13 from excessively pressurized gas entering the cavity of the cylinder portion 133.

[0128] In this embodiment, the pressure relief valve 138 is disposed in the cylinder 13 .

[0129] In this embodiment, the charging valve 137 is unidirectional and restricts the gas in the cylinder 13 from flowing out of the cylinder 13 through the charging valve 137 .

[0130] In this embodiment, the inflation valve 137 is configured as a valve core structure. This includes English valve needles, American valve cores, Presta valve cores, German valve needles, and Italian valve cores. The specific structure of the inflation valve 137 described above does not limit the substantive content of this application. When the gas pressure within the cavity of the cylinder 13 exceeds a second preset pressure, the inflation valve 137 restricts gas from entering the cavity of the cylinder 13. This prevents excessive gas pressure within the cavity of the cylinder 13, making it difficult for the piston 151 to compress the gas, or damaging the cylinder 13 during compression.

[0131] The values ​​of the first preset pressure and the second preset pressure are adjusted and adaptively set according to the requirements of the specific product. In some embodiments, the first preset pressure is less than the second preset pressure. Optionally, the first preset pressure is equal to the second preset pressure.

[0132] The cylinder 13 also includes an inflation portion 136, which is connected to the cavity of the cylinder portion 133 via an inflation valve 137. The inflation portion 136 includes a gas channel portion 1361, with an inflation nozzle 135 and an inflation valve 137 disposed at both ends of the gas channel portion 1361. A pressure relief valve 138 is disposed on the gas channel portion 1361. When the pressure relief valve 138 and the inflation valve 137 are closed, the air pressure within the gas channel is greater than or equal to atmospheric pressure. The gas channel portion 1361 forms a second air cavity having a predetermined length. The pressure relief valve 138 releases gas in a direction intersecting the length of the second air cavity.

[0133] The cylinder 13 is configured to have a structure with an inner and outer cylinder body. It can be understood that the cylinder portion 133 has an inner cylinder 131 and an outer cylinder 132 arranged around the inner cylinder 131. Among them, the outer cylinder 132 is configured as a cylindrical structure with an opening, which has an annular outer wall 1321. A chamber is formed inside the outer cylinder 132. The chamber of the outer cylinder 132 is configured with the chamber of the inner cylinder 131 surrounded by the annular inner wall 1312. The chamber of the inner cylinder 131 and the chamber of the outer cylinder 132 are interconnected. The annular inner wall 1312 is configured to guide the movement of the piston 151 along the second straight line 102 to compress the gas.

[0134] It is understood that when a double-layer cylinder 13 is provided, the gases in the inner and outer cylinders are in communication. The firing assembly 15 disposed in the inner cylinder 131 has a smaller contact area with the gas in the cylinder 13 when driven to compress the gas or when the gas is driven to perform work. This results in smaller changes in the gas pressure in the cylinder 13, thereby ensuring a more stable striking force output by the gas in the cylinder 13. This also provides the nail gun 100 with a better operating experience.

[0135] In this embodiment, the outer cylinder 132 is arranged concentrically with the inner cylinder 131 .

[0136] In this embodiment, the inflation portion 136 is provided on the outer cylinder 132. The inflation nozzle 135, the inflation valve 137 and the pressure relief valve 138 are respectively provided on the outer cylinder 132. As shown in FIG12 , one end of the sealed cylinder bottom 134 of the outer cylinder 132 and the annular outer wall 1321 are an integrally formed structure. In some embodiments, as shown in FIG13 and FIG14 , the cylinder bottom 134 ′ and the annular outer wall 1321 ′ are separate components, which are sealedly connected by fasteners and seals. As an alternative embodiment, as shown in FIG14 , the inflation nozzle 135 ′ is configured to restrict the gas from being released from the inflation nozzle 135 ′ and flowing out of the cylinder.

[0137] The inflation portion 136 is arranged at or near the cylinder bottom 134. The inflation portion 136 is formed at the cylinder bottom 134 and is located in the cavity of the outer cylinder 132. Optionally, the inflation portion 136 is provided with three mounting ports. The first mounting port 1363 is provided for the inflation nozzle 135 to enter the inflation portion 136. The second mounting port 1364 is provided for the inflation valve 137 to enter the inflation portion 136. The third mounting port 1365 is provided for the pressure relief valve 138 to enter the inflation portion 136. The third mounting port 1365 is located between the first mounting port 1363 and the second mounting port 1364. The two ends of the gas channel portion 1361 are the first mounting port 1363 and the second mounting port 1364 respectively. It can be understood that the first mounting port 1363 communicates with the outside world and the gas channel portion 1361. The second mounting port 1364 connects the gas channel portion 1361 and the cavity of the outer cylinder 132. The extension axis of the third mounting port 1365 intersects with the extension axis of the gas channel portion 1361, i.e., the second air cavity 1362. When the pressure relief valve 138 and the inflation valve 137 are in the closed state, and when the inflation nozzle 135 is also in the closed state, the gas channel forms a closed cavity, i.e., no gas flows in the second air cavity 1362. In some embodiments, if the inflation nozzle 135 is normally open and the cylinder 13 maintains gas through the inflation valve 137, the gas channel is in a state of communication with the atmosphere, and the second air cavity 1362 has gas flow with the outside atmosphere. Therefore, when the pressure relief valve 138 and the inflation valve 137 are in the closed state, the air pressure in the gas channel is greater than or equal to atmospheric pressure.

[0138] As shown in Figures 13 and 14, in some alternative embodiments, the cylinder 13' may be provided with only one layer of cylinders, that is, only an outer cylinder 132' is provided. The inflatable portion 136' is provided on the outer cylinder 132'.

[0139] As shown in Figures 2 and 15 to 16, the second shell 112 forms a second accommodating space 11b. The second shell 112 supports the cylinder 13. Optionally, the outer cylinder 132 is at least partially positioned in the second shell 112. The second shell 112 includes an inflation hole 1121 corresponding to the inflation nozzle 135. That is, the inflation nozzle 135 is exposed to the outside world through the inflation hole 1121. The retaining member 19 is configured to fix the cylinder 13. The retaining member 19 includes a positioning portion 191, and the positioning portion 191 is configured to fix the cylinder 13 at a preset position that corresponds to the inflation nozzle 135 and the inflation hole 1121. The positioning portion indicates the position where the inflation nozzle and the inflation hole are assembled to ensure that the inflation nozzle 135 is assembled in a directional position. The use of the positioning portion 191 enables the assembler to determine the installation direction and positioning direction, which facilitates the determination of the position.

[0140] The positioning portion 191 includes a first indicator structure 1911 provided on the retaining member 19. A second indicator structure 1912 is provided on the cylinder 13. When the first indicator structure 1911 and the second indicator structure 1912 satisfy a preset relationship, the position of the cylinder 13 satisfies the preset position. In this embodiment, the first indicator structure 1911 and the second indicator structure 1912 are respectively configured as flattening mechanisms. When the two flattening mechanisms are aligned, when the cylinder 13 is installed in the second housing 112, the position of the inflation nozzle 135 is aligned with the position of the inflation hole 1121, and the assembler does not need to repeatedly adjust the position of the inflation nozzle 135 to align with the position of the inflation hole 1121.

[0141] In some embodiments, the first indicator structure 1911 and the second indicator structure 1912 are respectively configured as notches, concave-convex matching structures, pin-slot matching structures, or similar external structures that can indicate that the assembly is in place, or can indicate that the assembly is in place through sound or stop structures.

[0142] As shown in Figures 15 and 16, the retaining member 19 is configured to connect the inner cylinder 131 and the outer cylinder 132. Optionally, the inner cylinder 131 and the outer cylinder 132 are connected by rotation, and the positioning portion 191 indicates the end point of the outer cylinder 132's rotation. In one embodiment, the retaining member 19 includes a first threaded segment 1311 disposed on the outer sidewall of the inner cylinder 131 and a second threaded segment 1322 disposed on the inner sidewall of the outer cylinder 132. The first threaded segment 1311 engages with the second threaded segment 1322. When the first indicator structure 1911 and the second indicator structure 1912 are aligned, the first threaded segment 1311 and the second threaded segment 1322 rotate into engagement. In this embodiment, the retaining member 19 also includes a retaining ring 193 disposed on the outer side of the outer cylinder 132 to prevent the first threaded segment 1311 from disengaging from the second threaded segment 1322. Optionally, the first indicator structure 1911 is formed on or connected to the retaining ring 193.

[0143] The retaining member 19 also includes a support base 194 connected to the cylinder 13. The support base 194 is configured to secure the inner cylinder 131 and position it relative to the housing 11. The support base 194 is formed with a first through-hole 195 through which the firing assembly 15 passes. The opening in the cylinder 13 through which the piston 151 passes is connected to the first through-hole 195. In other words, when the cylinder 13 and the support base 194 are connected, the cylinder 13 and the support base 194 form a continuous, integrated unit, allowing the piston 151 to move within this continuous range. The integrated unit formed by the cylinder 13 and the support base 194 is demarcated by the piston 151 and comprises a first space and a second space. The first space is a relatively enclosed space formed near the end of the piston 151 near the cylinder 13. The second space is a relatively open space formed near the end of the piston 151 near the support base 194. In an alternative embodiment, a first indicator structure 1911 is formed on or connected to the support base 194.

[0144] As an alternative embodiment, as shown in FIG17 , the cylinder 13 further includes a dust guard 198 . Dust guard 198 is positioned where the striker 16 extends from the cylinder 13 to prevent dust from the striker 16 from entering the cylinder 13. Optionally, dust guard 198 is positioned near or within first through hole 195 . Optionally, a cushion 196 is also positioned on the support seat 194 . When the piston 151 moves onto the support seat 194 at high speed, the piston 151 contacts the cushion 196 and partially offsets the kinetic energy, preventing direct collision between the piston 151 and the support seat 194 and potentially damaging the piston 151 or the support seat 194. Dust guard 198 is positioned on the striker 16 and within the space formed by cushion 196 . Optionally, a firing channel 197 is connected to the support seat 194 . A gap is defined between the side of the firing channel 197 proximal to the piston 151 and the cushion 196 . Dust guard 198 is positioned within this gap. Optionally, the dustproof portion 198 includes a deformable component such as a felt pad, a rubber pad, or a silicone pad, which is configured to passively block dust on the striker 16 from entering the cylinder 13. Optionally, the dustproof portion 198 includes a magnetic or electrostatic adsorption component, which is configured to actively adsorb dust and prevent it from entering the cylinder 13.

[0145] To ensure lubrication between piston 151 and cylinder 13, a lubricant is provided between the two sides to reduce friction, wear, and gas work loss. Since cylinder 13 is a sealed structure after assembly, the movement of piston 151 over time can cause lubricant loss, resulting in wear between cylinder 13 and piston 151, and compromised sealing of cylinder 13. As an optional implementation of this embodiment, as shown in FIG18 , a lubrication compensation assembly 18 is provided within cylinder 13 to compensate for lubricant loss during operation. Lubrication compensation assembly 18 includes a first retaining member 181, a second retaining member 182, and a grease reservoir 183. First retaining member 181 is connected to one end of cylinder 13 to maintain the coupling between lubrication compensation assembly 18 and cylinder 13. Second retaining member 182 is formed on or connected to first retaining member 181. Second retaining member 182 is provided with a first groove 1821, which is configured to store grease 185. A second groove 1822 is formed on the side of the second retaining member 182 facing the inner wall of the cylinder 13. This groove accommodates the grease reservoir 183. The first groove 1821 and the second groove 1822 are connected by an oil outlet channel 1823. In this embodiment, the grease reservoir 183 comprises a porous medium. The porous medium is annular and disposed around the second retaining member 182. In this embodiment, an elastic element 184 is disposed on the first retaining member 181. A certain gap is provided between the piston 151 and the lubrication compensation assembly 18. In this embodiment, the lubrication compensation assembly 18 is disposed at the bottom 134 of the cylinder 13. When the piston 151 compresses gas, the lubrication compensation assembly 18 moves toward the bottom 134 of the cylinder 13 with the movement of the piston 151, thereby compressing the elastic element 184. When the gas in the cylinder 13 releases energy to push the piston 151, the lubrication compensation assembly 18 is pushed by the elastic element 184, thereby ensuring that the lubricating grease released by the lubrication compensation assembly 18 is distributed as evenly as possible on the inner wall of the cylinder 13.

[0146] As shown in Figures 2, 19 to 20, and 24, the nail gun 100 also includes a circuit board assembly 32 and a drive circuit 3222. The motor 121 is a brushless DC motor. The circuit board assembly 32 is electrically connected to the motor 121 to control the motor 121. The circuit board assembly 32 includes a circuit board body 321, a controller 322, a first heat dissipation portion 323, and a detection module 3221. The circuit board body 321 includes: a PCB (Printed Circuit Board) and an FPC (Flexible Printed Circuit Board). The controller 322 uses a dedicated control chip, such as a single-chip microcomputer or a microcontroller unit MCU (Microcontroller Unit). The controller 322 is arranged on the circuit board body 321.

[0147] The drive circuit 3222 is electrically connected to the stator windings U, V, and W of the motor 121 and is used to transfer current from the battery pack 30 to the stator windings U, V, and W to drive the motor 121 to rotate. In one embodiment, the drive circuit 322 includes a plurality of switching elements Q1, Q2, Q3, Q4, Q5, and Q6. The gate terminal of each switching element is electrically connected to the controller 322 for receiving a control signal from the controller 322. The drain or source of each switching element is connected to the stator windings U, V, and W of the motor 121. The switching elements Q1-Q6 receive control signals from the controller 322 to change their respective conduction states, thereby changing the current loaded by the battery pack 30 on the stator windings U, V, and W of the motor 121. In one embodiment, the drive circuit 3222 can be a three-phase bridge driver circuit including six controllable semiconductor power devices (such as FETs, BJTs, IGBTs, etc.). It is understandable that the above-mentioned switching element may also be any other type of solid-state switch, such as an insulated gate bipolar transistor (IGBT), a bipolar junction transistor (BJT), etc.

[0148] The controller 322 specifically controls the on / off state of the switching elements in the driving circuit 3222 through the control chip. The control chip controls the switching elements in the driving circuit 3222 to be on or off according to the control signal from the controller 322. In some embodiments, the control signal from the controller 322 is a PWM control signal.

[0149] During the process of the controller 322 controlling the operating state of the motor 121, the controller 322 will generate a temperature rise. Because the electronic components on the circuit board body 321 are highly sensitive to temperature, excessive temperature rise and failure to dissipate heat in a timely manner will not only affect the control efficiency of the controller 322, but may also damage the components on the circuit board body 321. In this embodiment, in addition to the first heat dissipation portion 323 of the circuit board assembly 32, the nail gun 100 is also provided with a second heat dissipation portion 33. The second heat dissipation portion 33 is disposed outside the circuit board assembly 32. The nail gun 100 is also provided with a heat conducting portion 34, which connects the circuit board assembly 32 and the second heat dissipation portion 33 to ensure thermal contact between the circuit board assembly 32 and the second heat dissipation portion 33. The second heat dissipation portion 33 includes a core portion 331 with heat storage capabilities and an outer shell portion 332 with heat dissipation capabilities. The core portion 331 is configured to undergo a phase change reaction at a preset temperature to cool the outer shell portion 332.

[0150] In this embodiment, the core 331 includes a phase change material. The phase change material is configured to at least partially dissolve at a preset temperature. In some embodiments, the preset temperature is determined based on the temperature change of the first heat dissipation portion. In some embodiments, the preset temperature is determined based on the difference between the temperature of the first heat dissipation portion and the maximum temperature that the circuit board body 321 can withstand. Optionally, the preset temperature is configured to be lower than the temperature of the first heat dissipation portion. Optionally, the preset temperature is configured to be lower than the temperature of the housing 332 when the nail gun 100 is in high power output to cool the housing 332. The nail gun 100 in a high power output situation includes, for example, the nail gun 100 is in a high output power (operating at the nominal output power or higher), high speed (at the nominal maximum speed or higher), and high load (at the nominal output striking force or higher) operating state.

[0151] The outer shell 332 is comprised of a metal material. In some embodiments, the outer shell 332 may include other heat-dissipating and heat-conducting materials. The outer shell 332 forms an openable and closable sealed cavity, within which the core 331 is housed. In other words, the phase change material is sealed within the outer shell 332. The phase change material rapidly absorbs heat from the outer shell 332 by transforming from solid to liquid. When the nail gun 100 stops operating or the ambient temperature drops, the phase change material gradually releases heat by transforming from liquid to solid. The solid-liquid phase transition of the phase change material occurs within a sealed cavity, preventing leakage of the phase change material. The solid-to-liquid transition of the phase change material absorbs heat and stores it within the material. The transition from liquid to solid also creates a heat storage and dissipation process. The addition of the second heat dissipation portion 33, which supplements the heat dissipation provided by the first heat dissipation portion 323, enhances heat dissipation capacity, further improving the performance of the nail gun 100. At the same time, the phase change material has the ability to store heat, which is equivalent to energy recovery during the heat dissipation process. The heat storage and heat dissipation process is carried out through the phase change reaction. Compared with increasing the fan 1211 or increasing the power of the fan 1211, the melting and heat dissipation effect of the phase change material is better and more uniform, and it avoids the problems of high noise and increased load on the motor 121.

[0152] In this embodiment, a battery mounting portion 1131 is provided on the handle portion 113. The battery mounting portion 1131 is configured to detachably connect the battery pack 30. The circuit board assembly 32 is disposed in the housing 11 of the battery mounting portion 1131. A fan 1211 is connected to the motor 121. When the motor 121 is started, the fan 1211 rotates to generate a heat dissipation airflow. The first heat dissipation portion 323 is configured as a circuit board housing that accommodates the circuit board body 321. In some embodiments, the circuit board housing is made of metal material for heat dissipation. The circuit board housing is also provided with a fin structure 3231. In some embodiments, a phase change material is also provided in the first heat dissipation portion 323 to improve the heat dissipation capability.

[0153] The second heat dissipation portion 33 is disposed in the handle portion 113. In this embodiment, the outer shape of the outer shell portion 332 adapts to the inner wall of the outer shell of the handle portion 113. Optionally, the outer side of the outer shell portion 332 is substantially completely in contact with the inner wall of the outer shell of the handle portion 113.

[0154] To facilitate heat transfer between the circuit board assembly 32 and the second heat sink 33, the heat conducting portion 34 is made of metal. The heat conducting portion 34 connects the first heat sink 323 and the housing 332, transferring heat that cannot be released by the first heat sink 323 to the second heat sink 33, thereby using the second heat sink 33 to assist in heat dissipation.

[0155] In this embodiment, the second heat dissipation portion 33 can also assist heat-generating components such as the motor 121 , the transmission assembly 122 or the cylinder 13 in dissipating heat when they are working.

[0156] As shown in Figures 21 to 23, according to another embodiment of the present application, the air volume of the cylinder 43 can be adjusted. The other structures of the nail gun 100 provided in Figure 1 are basically the same as those provided in this embodiment.

[0157] In this embodiment, the cylinder 43 includes a first cavity 431, a second cavity 436, and an adjustment assembly 432. The first cavity 431 houses the piston 151, which moves within the first cavity 431. The second cavity 436 is in communication with the first cavity 431. The adjustment assembly 432 has a first state and a second state. When the piston 151 is in the same position within the first cavity 431, in the first state (as shown in FIG. 22 ), the first cavity 431 and the second cavity 436 define a first effective volume. When the adjustment assembly 432 is in the second state (as shown in FIG. 21 ), the first cavity 431 and the second cavity 436 define a second effective volume, which is smaller than the second effective volume. By changing the state of the adjustment assembly 432, the inflation volume defined by the cylinder 43 changes, thereby varying the initial pressure within the cylinder 43. In other words, when the firing assembly 15 is in the firing state, the pressure within the cylinder 43 varies. On the one hand, the versatility of the product is improved. For products with different striking force requirements, the cylinder 43 structure can be universally used, and different striking force requirements can be achieved by changing the state of the adjustment assembly 432. In this embodiment, when the same volume of gas is filled into the cylinder 43, the striking force applied by the firing assembly 15 to the nail when the adjustment assembly 432 is in the first state is greater than the striking force applied by the firing assembly 15 to the nail when the adjustment assembly 432 is in the second state. Because the gas volume defined within the cylinder 43 when the adjustment assembly 432 is in the first state is smaller than the gas volume defined within the cylinder 43 when the adjustment assembly 432 is in the second state, when the same volume of gas is filled into the cylinder 43, the pressure within the cylinder 43 when the adjustment assembly 432 is in the first state is greater than the pressure within the cylinder 43 when the adjustment assembly 432 is in the second state.

[0158] In this embodiment, the piston 151 moves within the first cavity 431. Therefore, the volume of the first cavity 431 is related to the movement position of the piston 151. The second cavity 436 is disposed at the upper end of the first cavity 431 and / or at the outer periphery of the first cavity 431. The adjustment assembly 432 is at least partially disposed within the second cavity 436. Therefore, the defined volume of the first cavity 431 is independent of the state of the adjustment assembly 432.

[0159] The defined volume of the second cavity 436 is related to the state of the adjustment assembly 432 .

[0160] The adjustment assembly 432 includes an operating member 433, an adjusting piston 434, and a connecting portion 435. The operating member 433 is actuated to switch the operating state of the adjustment assembly 432. The adjusting piston 434 is driven by the operating member 433 to move within the second cavity 436. A sealing ring 4341 is provided on the outer side of the adjusting piston 434. The adjusting piston 434 is airtightly connected to the inner wall of the second cavity 436. As the position of the adjusting piston 434 changes, the volume defined by the second cavity 436 also changes. In this embodiment, the volume of the second cavity 436 is defined by the adjusting piston 434 and the inner wall of the second cavity 436. That is, the volume of the portion located below the adjusting piston 434, which forms a relatively closed cavity with the second cavity 436, is defined by the volume of the second cavity 436. The portion located above the adjusting piston 434 is not included in the volume defined by the second cavity 436. The connecting portion 435 connects the operating member 433 and the adjusting piston 434. The connecting portion 435 is driven by the operating member 433 to move the regulating piston 434 and maintain the position of the regulating piston 434 when the operating member 433 is released. In this embodiment, the connecting portion 435 includes a movable portion 4351 with a thread. The operating member 433 is formed with or connected to an adjusting portion 4352 that is threadedly engaged with the movable portion 4351. The adjusting portion 4352 does not move in the axial direction of the displacement direction of the regulating piston 434. When the regulating piston 434 needs to be moved, the operating member 433 is rotated, and the adjusting portion 4352 and the movable portion 4351 are axially displaced through the thread. When the regulating piston 434 moves into position, the interlocking threads can maintain the interlocking state. Therefore, when the operation of the operating member 433 is released, the regulating piston 434 can still maintain its current position when subjected to axial force.

[0161] In this embodiment, since the position of the regulating piston 434 can be infinitely adjusted, the regulating assembly 432 includes multiple states corresponding to multiple positions.

[0162] In some alternative embodiments, the connection portion 435 can also be a structure that drives the axial movement of the adjustment piston 434 through the axial movement of the operating member 433, which is convenient for hydraulic rods, telescopic rods, etc. Alternatively, the adjustment piston 434 can be moved by pressing and releasing the operating member 433. In some embodiments, the position of the adjustment piston 434 can also be changed through electronic control.

[0163] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A power tool comprising: case; A power output unit, at least partially disposed within the housing; a cylinder disposed at least partially within the housing; The cylinder stores gas; a piston driven by the power output unit, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; Wherein, the cylinder comprises: An air filling nozzle, through which the cylinder is pre-filled with gas; An air charging valve, wherein the gas charged by the air charging nozzle flows through the air charging valve and then enters the air cylinder; The pressure relief valve is arranged between the inflation nozzle and the inflation valve. When the pressure of the inflation gas of the inflation nozzle is greater than a first preset pressure, the inflation gas is released through the pressure relief valve.

2. The power tool according to claim 1, wherein: The pressure relief valve is unidirectional.

3. The power tool according to claim 1, wherein: The inflation valve is unidirectional.

4. The power tool according to claim 1, wherein: The charging valve restricts the gas in the cylinder from flowing out of the cylinder through the charging valve.

5. The power tool according to claim 1, wherein: When the pressure in the cylinder exceeds a second preset pressure, the charging valve restricts gas from entering the cylinder.

6. The power tool according to claim 5, wherein: The first preset pressure is less than or equal to the second preset pressure.

7. The power tool according to claim 1, wherein: The cylinder comprises: The cylinder portion is provided with a cavity, wherein the cavity is configured to store gas; An inflation portion is connected to the cavity through an inflation valve.

8. The power tool according to claim 7, wherein: The inflation portion includes a gas channel portion, the inflation nozzle and the inflation valve are arranged at two ends of the gas channel portion, and the pressure relief valve is arranged on the gas channel portion.

9. The power tool according to claim 8, wherein: When the pressure relief valve and the inflation valve are in a closed state, the gas pressure in the gas channel is greater than or equal to the atmospheric pressure.

10. The power tool according to claim 8, wherein: The gas channel portion forms a second gas cavity having a certain length, and the pressure relief valve releases gas along a direction intersecting with the length direction of the second gas cavity.

11. The power tool according to claim 1, wherein: The cylinder includes an inner cylinder in which the piston moves.

12. The power tool according to claim 11, wherein: The cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are communicated with each other, and the inflation nozzle, the inflation valve and the pressure relief valve are respectively arranged on the outer cylinder.

13. The power tool according to claim 12, wherein: The outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment.

14. The power tool according to claim 1, wherein: The shell includes an inflation hole corresponding to the inflation nozzle; The invention also includes a retaining member configured to fix the cylinder, wherein the retaining member includes a positioning portion, the positioning portion is at least partially disposed on the cylinder, and the positioning portion indicates a position where the inflation nozzle is assembled with the inflation hole.

15. The power tool according to claim 14, wherein: The positioning portion includes a first indicating structure, and the cylinder is provided with a second indicating structure. When the first indicating structure and the second indicating structure satisfy a preset relationship, the cylinder is fixed at a preset position that makes the inflation nozzle correspond to the inflation hole.

16. A power tool comprising: case; A power output unit, at least partially disposed within the housing; a cylinder disposed at least partially within the housing; The cylinder stores gas; A piston driven by the power output part, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; An air filling nozzle, through which the cylinder is pre-filled with gas; A one-way pressure relief valve is arranged at the downstream side of the inflation nozzle, and the one-way pressure relief valve is connected to the outside of the cylinder to release gas.

17. A power tool comprising: case; A power output unit, at least partially disposed within the housing; a cylinder disposed at least partially within the housing; The cylinder stores gas; A piston is driven by the power output unit, and the piston is disposed in the cylinder and in the cylinder Moving inside to compress the gas in the cylinder; Wherein, the cylinder comprises: An inflation nozzle, through which the cylinder is pre-filled with gas; the inflation nozzle restricts the release of the gas from the inflation nozzle; The one-way pressure relief valve is arranged at the downstream side of the inflation nozzle. When the pressure of the inflation gas of the inflation nozzle is greater than the first preset pressure, the inflation gas is released through the one-way pressure relief valve.

18. The power tool according to claim 17, wherein: The cylinder includes an inner cylinder, and the piston moves in the inner cylinder.

19. The power tool according to claim 18, wherein: The cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder is communicated with the outer cylinder, and the inflation nozzle and the one-way pressure relief valve are respectively arranged on the outer cylinder.

20. The power tool according to claim 19, wherein: The outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment.

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