Fastener driver

Abstract

The utility model discloses a fastener driver, comprising: a striking assembly comprising a striking member configured to strike a fastener; the driving assembly at least comprises a driving wheel and is arranged to drive the striking piece to move along the axis of the striking piece; the motor is arranged to drive the driving wheel to rotate; a wheel pin is arranged on the driving wheel, and the wheel pin can be meshed with the striking teeth on the striking piece to drive the striking piece to move; and at the beginning of the lifting period, the outer envelope line of the rotation track of the wheel pin at least has no interference with the non-meshing surface of the target striking tooth. The fastener driver is safer to use and long in service life.

Description

Technical Field

[0001] The present application relates to an electric tool, and in particular to a fastener driver. Background Art

[0002] A nail gun in the related art is used as a fastener driver to quickly drive nails into a work surface. The principles of existing nail gun products on the market can be divided into mechanical and cylinder types. Mechanical nail guns can be divided into spring, flywheel, friction wheel 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 energy storage according to the energy storage method. A compressed air-driven nail gun has a compressed air-driven cylinder, and the thrust generated by the cylinder is used as a driving force. A mechanical spring nail gun has an impact spring (compression spring), and the force of the impact spring is used as a driving force.

[0003] The compressed air driven nail gun is driven by the driving part through contact engagement, so the two need to have good matching accuracy, and the two need to move in place during operation to ensure that they do not interfere with each other. If the two often interfere with each other, collisions and other problems will affect the stability, safety and life of the machine.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a nail gun with a long service life.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] A fastener driver comprises: a striking assembly, comprising a striking piece configured to strike a fastener; a driving assembly, comprising at least a driving wheel, configured to drive the striking piece to move along the axis of the striking piece; a motor, configured to drive the driving wheel to rotate; a wheel pin is provided on the driving wheel, and the wheel pin can engage with a lifting tooth on the striking piece to drive the striking piece to move; the lifting tooth has an engaging surface that can engage with the wheel pin and a non-engaging surface opposite to the engaging surface; the wheel pin that engages with the lifting tooth at the beginning of a lifting cycle is defined as the first pin; the lifting tooth closest to the first pin at the beginning of the lifting cycle is defined as the target lifting tooth; at the beginning of the lifting cycle, the outer envelope of the wheel pin rotation trajectory has no interference with at least the non-engaging surface of the target lifting tooth.

[0008] In some embodiments, the striking member has a striking end for striking the fastener; an end of the striking member away from the striking end is defined as a fixed end; and a second lifting tooth starting from the fixed end is defined as a target lifting tooth.

[0009] In some embodiments, the third lifting tooth starting from the fixed end is the target lifting tooth.

[0010] In some embodiments, the non-engaging surface includes a relief portion that is recessed toward the engaging surface.

[0011] In some embodiments, the radius of curvature of the non-meshing surface of the target lifting tooth is greater than or equal to the radius of curvature of the outer envelope of the wheel pin rotation trajectory.

[0012] In some embodiments, the invention further comprises an energy storage assembly for driving the striking member to move from a parking position to a striking position to strike the fastener.

[0013] In some embodiments, the energy storage assembly includes a gas cylinder.

[0014] In some embodiments, a firing assembly is also included, which forms or connects the striking piece, and the energy storage assembly stores energy for driving the movement of the firing assembly.

[0015] In some embodiments, a plurality of wheel pins are provided along the circumference of the driving wheel.

[0016] In some embodiments, the striking member is provided with a plurality of lifting teeth along the extension direction, and the lifting teeth are provided corresponding to the wheel pins.

[0017] The benefit of the present application lies in that by setting the outer envelope of the wheel pin rotation trajectory to have no interference with at least the non-meshing surface of the target tooth at the beginning of the lifting cycle, the wheel pin on the driving wheel is prevented from colliding with the lifting tooth during the striking cycle, thereby ensuring the operating life and operating safety of the fastener driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural diagram of a fastener driver in one embodiment of the present application;

[0019] Figure 2 yes Figure 1 A partial schematic diagram of the internal structure of the fastener driver;

[0020] Figure 3 yes Figure 1 A schematic structural diagram of some components of a fastener driver, wherein the striking member is located at a striking position;

[0021] Figure 4 yes Figure 3 A structural diagram from another perspective;

[0022] Figure 5 yes Figure 3 A half-section view of the present invention, wherein the striking member is located at a striking position;

[0023] Figure 6 yes Figure 3 A half-section view of the present invention, wherein the striking member is located in a parking position;

[0024] Figure 7 is a schematic diagram of the outer envelope of the rotational trajectory of the striking member and the first pin;

[0025] Figure 8 yes Figure 7 A partial enlarged view of part J in the middle. DETAILED DESCRIPTION

[0026] Before any embodiments of the 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 above drawings.

[0027] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0028] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0029] In the present 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, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0030] In this application, it will be understood by those of ordinary skill 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, and use associated with a specific value, etc. 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).

[0031] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0032] 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 another element "upper" or "lower", but also indirectly connected to another 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, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0033] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0034] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0035] 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.).

[0036] like Figure 1 A fastener driver 100 of an embodiment of the present application is shown. The fastener driver 100 is used to drive a fastener into a work surface 200. For example, the fastener is a nail, and the nail can be a straight nail or a U-shaped nail. The fastener driver 100 drives the fastener to quickly drive into the work surface 200, thereby fixing the work surface 200 to the platform on the back of the work surface 200. In this embodiment, the fastener driver 100 is, for example, a nail gun. Optionally, the fastener driver 100 includes a mechanical spring-type nail gun that utilizes the force of a compressed coil spring as an impact force (e.g., a driving force). Optionally, the fastener driver 100 is a cylinder-type nail gun that compresses the gas in the cylinder, and the gas pushes out the firing assembly to thereby perform a nailing impact force (e.g., a driving force).

[0037] In this embodiment, the fastener driver 100 is a cylinder nail gun. In some embodiments, the fastener driver 100 does not require an external air pressure source, but includes a pre-charged pressurized gas in the cylinder assembly. In some embodiments, the cylinder assembly of the fastener driver 100 is connected to the atmosphere, and the cylinder flows into gas in a preset state.

[0038] like Figure 1 As shown, the fastener driver 100 uses a rechargeable battery pack as a power source. In this embodiment, the battery pack is a battery pack 300, and the battery pack 300 cooperates with a corresponding power circuit to power the fastener driver 100. Those skilled in the art should understand that in other embodiments, the fastener driver 100 can also be powered by other power supply devices. For example, the power supply can be an AC line connected to the mains, or the power supply can also be other connecting cables that can be connected to the power supply device. The mains or other power supply devices cooperate with corresponding rectification, filtering and voltage regulation circuits to realize power supply to the corresponding components of the fastener driver 100. The battery pack 300 will be used to replace the power supply below, but it cannot be used as a limitation to the present application.

[0039] like Figures 1 to 3 As shown, the fastener driver 100 includes: a housing 11, a striking assembly 12, a power mechanism 20 and a motor 14. The housing 11 is used to support the striking assembly 12, the power mechanism 20 and the motor 14. The striking assembly 12 includes a striking member 121 for driving the fastener, and optionally, the striking member 121 is used to drive the fastener to be shot into the working surface 200 along the striking line 101. The striking member 121 is a sheet-like element extending along a plane parallel to the striking line 101, and the axis defined by the striking member 121 coincides with the striking line 101. The power mechanism 20 is used to drive the striking member 121 to move along the striking line 101 so as to impact the fastener to be shot into the working surface 200 along the striking line 101.

[0040] In order to facilitate the description of the technical solution of this application, the following definitions are made: Figure 1 The front-to-back direction and the up-to-down direction are shown, wherein the front-to-back direction is parallel to the striking line 101, the direction from the striking member 121 to the fastener is the front, and the up-to-down direction is perpendicular to the front-to-back direction.

[0041] In the present embodiment, the motor 14 is disposed in the housing 11, and the motor 14 is used to provide power to the power mechanism 20. In the present embodiment, the motor 14 is specifically an electric motor 14, and the power mechanism 20 is provided with power by the electric motor 14. It is understandable that in other embodiments, the motor 14 may also be other forms of power sources, such as an engine. In the present application, for the convenience of description, the motor 14 is used for description. The motor 14 is an inner rotor motor 14, which includes: a stator assembly and a rotor assembly, the rotor assembly includes a motor shaft 141 for outputting power, and the stator assembly surrounds the motor shaft 141. The motor shaft 141 can rotate around the motor axis 104 relative to the housing 11 to output power. It is understandable that in other embodiments, the motor 14 can also be an outer rotor motor. A battery pack 300 is detachably mounted to the housing 11. When the battery pack 300 is mounted to the housing 11, it can at least supply power to the motor 14 to enable the motor 14 to operate.

[0042] The power mechanism 20 includes: a driving assembly 21, an energy storage assembly 22 and a firing assembly 23. The driving assembly 21 is used to drive the energy storage assembly 22 to store energy. The firing assembly 23 forms or connects the striking piece 121, and the firing assembly 23 is configured to be able to move relative to the housing 11 along the second straight line 102 and drive the striking piece 121 to move along the striking straight line 101 when moving along the second straight line 102. The energy storage assembly 22 stores energy for driving the firing assembly 23 to move, and drives the firing assembly 23 to move along the second straight line 102 when releasing energy, thereby driving the striking piece 121 to move along the striking straight line 101.

[0043] The fastener driver 100 further includes a magazine 191 disposed at the front end of the housing 11 . The magazine 191 is used to accommodate fasteners. The magazine 191 can push the fasteners one by one into the striking assembly 12 .

[0044] The housing 11 includes a main body 111, a motor housing 113 and a handle 112. The main body 111 is formed with a first housing cavity for housing at least a portion of the energy storage assembly 22. The motor housing 113 has a built-in motor 14. The handle 112 is used for a user to hold to operate the fastener driver 100. The motor housing 113 and the handle 112 extend downward from the lower part of the main body 111. The motor housing 113 is on the front side, and the handle 112 is on the rear side, extending substantially parallel to each other.

[0045] The housing 11 also includes: a coupling portion 115 for coupling the battery pack 300, and the battery pack 300 can be detachably mounted to the coupling portion 115. The coupling portion 115 is arranged between the motor housing portion 113 and the end portion of the handle portion 112. Optionally, the coupling portion 115 is arranged at an end of the handle portion 112 away from the main body portion 111. The battery pack 300 can be mounted to the coupling portion 115 in a direction intersecting with the direction of the second straight line 102. In some embodiments, the battery pack 300 can be mounted to the coupling portion 115 in a direction parallel to the second straight line 102.

[0046] The fastener driver 100 further includes a trigger 192, which is mounted to the handle portion 112. The user can operate the trigger 192 to move the trigger 192 when holding the handle portion 112. The trigger 192 is used for the user to operate to start the fastener driver 100, and the trigger 192 also includes an operating surface for the user to operate. When the user's hand holds the handle portion 112, the user can contact the operating surface with the index finger to pull the trigger 192. The operating surface is the front surface of the trigger 192. In this embodiment, the operating surface is an arc-shaped surface that fits the user's finger.

[0047] A through hole 114 is formed between the motor housing portion 113 and the handle portion 112 for the user's hand to pass through. In the present embodiment, the main body 111 connects the handle portion 112 and the motor housing portion 113 at the upper side of the handle portion 112 and the motor housing portion 113, and the coupling portion 115 connects the handle portion 112 and the motor housing portion 113 at the lower side of the handle portion 112 and the motor housing portion 113. In this way, the main body 111, the motor housing portion 113, the coupling portion 115 and the handle portion 112 are sequentially connected to surround and form the above-mentioned through hole 114. It can be understood that in other embodiments, the coupling portion 115 may not connect the handle portion 112 and the motor housing portion 113, so that the through hole 114 is the area between the handle portion 112 and the motor housing portion 113. The through hole 114 penetrates the housing 11 in the left-right direction perpendicular to the second straight line 102. When the user holds the handle 112, the user's fingers can be at least partially located in the through hole 114, or the fingers can pass through the through hole 114, so that the user's palm and fingers can surround the handle 112 to hold the handle 112. The trigger 192 is also disposed in the through hole 114 area.

[0048] The fastener driver 100 further includes a speed reduction mechanism 15 disposed between the motor 14 and the power mechanism 20, the speed reduction mechanism 15 connecting the motor 14 and the power mechanism 20, thereby transmitting the power output by the motor 14 to the power mechanism 20. The speed reduction mechanism 15 also reduces the speed of the output of the motor 14 for output. The speed reduction mechanism 15 is at least partially disposed in the motor housing portion 113.

[0049] In this embodiment, the speed reduction mechanism 15 includes a first speed reduction assembly 151, and the first speed reduction assembly 151 uses a planetary gear for speed reduction. Because the speed reduction working principle of the planetary gear set and the speed reduction generated by this transmission mechanism have been fully disclosed to professionals in the field, a detailed description is omitted here for the purpose of brevity of the specification.

[0050] In this embodiment, the fastener driver 100 further includes a shaft lock assembly, which (not shown) transmits power to the output shaft 1511. The shaft lock assembly allows the power to be transmitted from the motor 14 to the output shaft 1511, while preventing the power from being transmitted from the output shaft 1511 to the motor 14 in the reverse direction. The structure of the shaft lock assembly is a relatively common technology and will not be described in detail here.

[0051] The energy storage assembly 22 includes a gas spring mechanism or a mechanical spring mechanism, wherein the mechanical spring mechanism utilizes the drive assembly to compress the spiral elasticity, thereby causing the spring to store energy when compressed and release energy when stretched. The spring drives the striking member to move when releasing energy.

[0052] like Figures 2 to 4 As shown, in the present embodiment, the energy storage assembly 22 is, for example, a gas spring mechanism. Wherein, the energy storage assembly 22 comprises: a cylinder 221, and the cylinder 221 also comprises an air filling nozzle 224, which is used to pre-fill gas in the cylinder 221. The firing assembly 23 is at least partially arranged in the cylinder 221. The firing assembly 23 works on the gas in the cylinder 221, and the gas in the cylinder 221 pushes the firing assembly 23 to move, so as to drive the fasteners (for example, nails, tacks, staples, etc.) held in the magazine 191 into the workpiece. The firing assembly 23 comprises a piston 231, and the striking member 121 and the piston 231 are fixedly connected, and the piston 231 is driven to reciprocate in the cylinder 221 along the direction of the second straight line 102. In the present embodiment, the second straight line 102 overlaps with the striking straight line 101. In some embodiments, the second straight line 102 is parallel to the striking straight line 101 but does not overlap. In some embodiments, the second straight line 102 is arranged at a certain angle to the striking straight line 101.

[0053] like Figures 3 to 6 As shown, the driving assembly 21 includes a driving wheel 211, which is arranged on the output shaft 1511. In a striking cycle, the motor 14 rotates to drive the driving wheel 211 to rotate, thereby driving the striking member 121 to move from the lower dead point or striking position to the upper dead point or parking position, and the firing assembly 23 compresses the gas in the cylinder 221. Figure 6As shown, when in the stop position, the firing assembly 23 and the driving wheel 211 are held in place, and the compressed gas continues to push the firing assembly 23, that is, the piston 231, so that it has an acceleration. Until a trigger instruction representing the user to start nailing is received, the holding force of the firing assembly 23 is released. Figure 5 As shown, when the holding force is released, the gas compressed by the firing assembly 23 drives the firing assembly 23 and the striking member 121 to the striking position, thereby driving the nail into the workpiece.

[0054] In this embodiment, a striking cycle is defined to include a lifting cycle and a striking cycle. The lifting cycle is defined to start from when the rotation of the driving wheel 211 can drive the striking member 121 to move toward the upper dead point or the stop position. Figure 5 The striking cycle is defined as starting from the time when the holding force is released and the gas compressed by the firing assembly 23 drives the firing assembly 23 and the striking member 121 to move toward the bottom dead center or striking position.

[0055] In this embodiment, a wheel pin 212 is provided on the driving wheel 211, and a lifting tooth 122 engaged with the wheel pin 212 is provided on the striking member 121. The wheel pin 212 is engaged with the lifting tooth 122 to drive the striking member 121 to move. The lifting tooth 122 is configured as a meshing surface 1221 engaged with the wheel pin 212 and a non-meshing surface 1222 opposite to the meshing surface 1221. The wheel pin 212 engaged with the lifting tooth 122 at the beginning of a lifting cycle is defined as the first pin 212a, and the lifting tooth 122 closest to the first pin 212a at the beginning of the lifting cycle is defined as the target lifting tooth 122b. It should be explained that the lifting tooth 122 closest to the first pin 212a can be any lifting tooth 122 downstream of the first lifting tooth 122a engaged with the first pin 212a.

[0056] like Figures 7 and 8 As shown, at the beginning of the lifting cycle, the outer envelope E of the rotation trajectory of the wheel pin 212 has no interference with at least the non-meshing surface 1222 of the target lifting tooth 122b. The outer envelope E of the rotation trajectory of the wheel pin 212 is a curve that is tangent to each line of the rotation trajectory of the wheel pin 212 at least at one point. In the related art, due to some reasons, the striking member 121 does not completely move to the theoretical stop position. Then, during the rotation of the driving wheel 211, the wheel pin, such as the first pin 212a, may collide with the downstream lifting tooth (such as the target lifting tooth 122b) of the meshing lifting tooth (such as the first lifting tooth 122a). In this embodiment, by reasonably setting the shape of the lifting tooth 122, the wheel pin 212 on the driving wheel 211 is prevented from colliding with the lifting tooth 122 during the striking cycle, thereby ensuring the operating life and operating safety of the fastener driver.

[0057] In this embodiment, the wheel pin 212 and the lifting tooth 122 are configured as mutually meshing protrusions and recesses. Optionally, the recess may be a groove, a blind hole or a through hole structure.

[0058] like Figure 3 and Figure 4 As shown, the driving wheel 211 includes a first fixed layer 213 and a second fixed layer 214 which are arranged substantially in parallel. A plurality of wheel pins 212 are arranged circumferentially between the first fixed layer 213 and the second fixed layer 214. The first fixed layer 213 and the second fixed layer 214 are plates with a certain thickness. The plurality of wheel pins 212 are cylindrical, and the two ends of the cylinder are respectively arranged on the first fixed layer 213 and the second fixed layer 214. In some embodiments, the wheel pin 212 is movable or rotatable to reduce the friction between the wheel pin 212 and the lifting tooth 122. In some embodiments, a movable or rotatable pin sleeve is provided on the wheel pin 212.

[0059] like Figure 5 and Figure 6 As shown, the striking member 121 is provided with a striking end 123 for striking a fastener and a fixed end 124 away from the striking end 123. In the present embodiment, the fixed end 124 is fixedly connected with the piston 231. It should be explained that the fixed end 124 and the piston 231 are fixedly connected, which means that the user or non-professional cannot disassemble the fixed end 124 and the piston 231 of the striking member 121 without using tools. Professionals can disassemble the fixed end 124 and the piston 231 of the striking member 121 non-destructively with the assistance of tools to facilitate maintenance. In the present embodiment, the striking end 123 is downstream of the fixed end 124, and a plurality of lifting teeth 122 are provided between the fixed end 124 and the striking end 123. The plurality of lifting teeth 122 are arranged on the striking member 121 along the length direction of the striking member 121. The plurality of lifting teeth 122 are protrudingly arranged and are wavy as a whole.

[0060] Exemplarily, the second lifting tooth 122 starting from the fixed end 124 is the target lifting tooth 122b. Exemplarily, the third lifting tooth 122 starting from the fixed end 124 is the target lifting tooth 122b (marked in the figure). In some embodiments, the lifting tooth 122 at the upstream end of the target lifting tooth 122b has the same tooth profile structure as the target lifting tooth 122b. In some embodiments, the lifting teeth 122 at the upstream and downstream ends of the target lifting tooth 122b have the same tooth profile structure as the target lifting tooth 122b. In some embodiments, the first lifting tooth 122a that should be engaged with the first pin 212a in theoretical design and normal operation of the machine is different from the tooth profile structure of the target lifting tooth 122b. In some embodiments, when the theoretical design and the machine are working normally, when in the park position, the lifting tooth that engages with the wheel pin 212 when the firing assembly 23 and the drive wheel 211 are held in place is defined as a retaining lifting tooth 122c, and the tooth structure of the retaining lifting tooth 122c is different from that of the target lifting tooth 122b.

[0061] like Figures 7 and 8 As shown, in this embodiment, the non-meshing surface 1222 of the lifting tooth is provided with a relief portion 1223 that is recessed toward the meshing surface 1221, and the relief portion 1223 is substantially arc-shaped, and has a curvature radius R'. The curvature radius of the outer envelope E of the rotation trajectory of the wheel pin 212 is R. The curvature radius R' of the relief portion 1223 is greater than or equal to the curvature radius R of the outer envelope E of the rotation trajectory of the wheel pin 212. This reduces the risk of collision between the wheel pin 212 and the lifting tooth 122 during operation.

[0062] like Figure 4 As shown, the driving wheel 211 rotates with the third straight line 103 as the axis. In this embodiment, the third straight line 103 coincides with the motor axis 104, and the third straight line 103 intersects with the striking straight line 101. For example, the third straight line 103 is perpendicular to the striking straight line 101. A plurality of wheel pins 212 are distributed along the circumference of the driving wheel 211, and each wheel pin 212 on the driving wheel 211 is respectively meshed with the lifting teeth 122 on the striking member 121. Figure 5 As shown, in the lifting cycle, starting from the engagement of the first pin 212a with the first lifting tooth 122a, the wheel pins 212 arranged in sequence along the rotation direction are engaged with the corresponding lifting teeth 122 in sequence, until the wheel pin is engaged with the holding lifting tooth 122c (as shown in FIG. Figure 6 As shown in FIG. 1 ), the striking member 121 and the piston 231 move to the parking position (top dead center).

[0063] like Figure 1 and Figure 2As shown, the fastener driver 100 also includes a fan 145, which is fixedly connected to the motor shaft 141 and can rotate synchronously with the motor shaft 141. The fan 145 is installed to the upper end of the motor shaft 141. When the fan 145 rotates, it can generate a heat dissipation airflow that flows into the housing 11 from the outside and then flows out of the housing 11. The housing 11 is formed with an airflow inlet 117 and an airflow outlet 116, the airflow inlet 117 corresponds to the position of the fan 145, and the airflow outlet 116 corresponds to the position of the circuit board assembly 17a. In this embodiment, a capacitor with higher power is provided on the circuit board assembly 17a. The airflow outlet 116 also corresponds to the position of the capacitor. When the fan 145 rotates, the heat dissipation airflow enters the housing from the airflow inlet 117, and then flows through the circuit board assembly 17a and flows out from the airflow outlet 116.

[0064] The control circuit board 17a is disposed in the joint 115, and the capacitor is disposed on the upper side of the control circuit board 17a. The lower side of the control circuit board 17a is provided with electrical connection terminals, which are used to form an electrical connection with the battery pack 300 so that the battery pack 300 supplies power to the motor 14.

[0065] In some embodiments, a partition for separating the motor 14 and the circuit board assembly 17 a may be provided at the joint 115 , so that the heat generated during the operation of the motor 14 will not enter the circuit board assembly.

[0066] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A fastener driver comprising: a striking assembly, including a striking member configured to strike the fastener; A driving assembly, comprising at least a driving wheel, configured to drive the striking member to move along the axis of the striking member; A motor, configured to drive the driving wheel to rotate; It is characterized in that The driving wheel is provided with a wheel pin, and the wheel pin can mesh with the lifting teeth on the striking member to drive the striking member to move; The lifting tooth has an engagement surface capable of engaging with the wheel pin and a non-engagement surface opposite to the engagement surface; The wheel pin meshing with the lifting tooth at the beginning of a lifting cycle is defined as the first pin; the lifting tooth closest to the first pin at the beginning of the lifting cycle is defined as the target lifting tooth; At the beginning of the lifting cycle, the outer envelope of the wheel pin rotation trajectory at least has no interference with the non-meshing surface of the target lifting tooth.

2. The fastener driver according to claim 1, characterized in that The striking member has a striking end for striking the fastener; an end of the striking member away from the striking end is defined as a fixed end; and the second lifting tooth starting from the fixed end is defined as the target lifting tooth.

3. The fastener driver according to claim 2, characterized in that The third lifting tooth starting from the fixed end is the target lifting tooth.

4. The fastener driver of claim 1, wherein: The non-meshing surface includes a relief portion recessed toward the meshing surface.

5. The fastener driver of claim 1, wherein: The radius of curvature of the non-meshing surface of the target lifting tooth is greater than or equal to the radius of curvature of the outer envelope of the wheel pin rotation trajectory.

6. The fastener driver of claim 1, wherein: It also includes an energy storage component, which is used to drive the striking member to move from a parking position to a striking position to strike the fastener.

7. The fastener driver of claim 6, wherein: The energy storage assembly includes a cylinder.

8. The fastener driver of claim 7, wherein: It also includes a firing assembly, which forms or is connected to the striking piece, and the energy storage assembly stores energy for driving the movement of the firing assembly.

9. The fastener driver of claim 1, wherein: The driving wheel is provided with a plurality of wheel pins along the circumferential direction.

10. The fastener driver of claim 7, wherein: The striking member is provided with a plurality of lifting teeth along the extending direction, and the lifting teeth are provided corresponding to the wheel pins.

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