Electric hammer

Abstract

The present invention discloses an electric hammer, comprising: a housing; an output assembly disposed within the housing, the output assembly comprising a sleeve that rotates substantially about a first straight line; a motor comprising a motor shaft that rotates about a motor axis, wherein airflow is generated within the housing when the motor is running; a gearbox assembly fixedly disposed within the housing, the gearbox assembly forming a storage space; a transmission assembly for transmitting power from the motor to the output assembly, the transmission assembly disposed within the storage space; the electric hammer further comprising: an exhaust device for balancing the internal and external pressures of the storage space, the exhaust device comprising: an exhaust inlet disposed within the storage space, an exhaust outlet disposed outside the storage space, and an exhaust passage connecting the exhaust inlet and the exhaust outlet; a buffer mechanism disposed at the exhaust inlet, the buffer mechanism disposed within the storage space. This invention provides an electric hammer that can balance the temperature and pressure inside and outside the storage space of the electric hammer and can prevent leakage of lubricating oil during the exhaust process.

Description

Technical Field

[0001] The invention relates to an electric tool, in particular to an electric hammer. Background Art

[0002] A rotary hammer is an electric tool that uses a motor to drive a hammer attachment to rotate and impact. It is used to create holes in hard materials such as concrete, brick, and stone. Due to the hammer's complex internal transmission structure, which includes both rotating and impact transmission components, the hammer's internal temperature and pressure can be high, affecting its proper operation and reducing its service life. Furthermore, these high temperatures and pressures can easily cause the hammer's lubricating oil to leak, polluting the environment.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the object of the present invention is to provide an electric hammer that can balance the temperature and pressure inside and outside the working chamber of the electric hammer and prevent the leakage of lubricating oil during the exhaust process.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an electric hammer, comprising: a casing; an output assembly, arranged in the casing, the output assembly comprising a sleeve that basically rotates around a first straight line; a motor, comprising a motor shaft that rotates around the motor axis, and when the motor is running, an airflow is generated in the casing; a gear box assembly, fixedly arranged in the casing, the gear box assembly forming an accommodating space; a transmission assembly, used to transmit the power of the motor to the output assembly, and the transmission assembly is arranged in the accommodating space; the electric hammer also includes: an exhaust device, used to balance the internal and external pressures of the accommodating space, the exhaust device comprising: an exhaust inlet arranged in the accommodating space, an exhaust outlet arranged outside the accommodating space, and an exhaust channel connecting the exhaust inlet and the exhaust outlet; wherein a buffer mechanism is provided at the exhaust inlet, and the buffer mechanism is provided in the accommodating space.

[0006] Furthermore, the buffer mechanism includes a guide portion, which guides the airflow to enter from a first direction, and the exhaust inlet guides the airflow to enter from a second direction, wherein the first direction and the second direction are not in a straight line.

[0007] Furthermore, the gearbox assembly includes: a first gearbox, a second gearbox and a third gearbox connected to the first gearbox and the second gearbox, the first gearbox, the second gearbox and the third gearbox forming an accommodating space; the buffer mechanism includes a first buffer assembly; the exhaust device also includes: a first exhaust assembly arranged on the third gearbox, the first exhaust assembly cooperates with the first buffer assembly to guide the airflow to be discharged from the accommodating space; the first exhaust assembly is arranged along the circumferential direction of the sleeve, and in the direction perpendicular to the motor axis, the first exhaust assembly is located on the upper side of the first straight line.

[0008] Furthermore, the electric hammer also includes an oil filling port for oil filling arranged on the third gear box; the transmission assembly includes a first transmission member and a second transmission member that are meshedly connected, the first transmission member is connected to the motor shaft, and the second transmission member is connected to the sleeve; in the direction along the motor axis, the first exhaust assembly is arranged between the oil filling port and the second transmission member.

[0009] Furthermore, the transmission assembly includes a first transmission member and a second transmission member that are meshedly connected, the first transmission member is connected to the motor shaft, and the second transmission member is fixedly connected to the sleeve; in the direction along the first straight line, the distance D from the first buffer assembly to the second transmission member is greater than or equal to 7 mm and less than or equal to 25 mm.

[0010] Furthermore, the first buffer component includes a first guide portion for guiding the direction of airflow, the first guide portion and the third gear box form a first air inlet for air intake, and the first guide portion basically extends along the first air intake direction; the first exhaust component includes: a first exhaust inlet for guiding the airflow and a first exhaust outlet for exhausting the airflow, and a first exhaust channel connecting the first exhaust inlet and the first exhaust outlet, the first exhaust inlet guides the airflow basically along the second air intake direction to be discharged outside the accommodating space; wherein the first air intake direction intersects with the second air intake direction.

[0011] Furthermore, the first exhaust assembly further includes a first accommodating groove, which is sleeved on the outer side of the first exhaust outlet;

[0012] The first exhaust outlet is fixedly connected to or integrally formed with the third gear box, and the first accommodating groove is fixedly connected to or integrally formed with the casing.

[0013] Furthermore, the electric hammer also includes: an impact assembly that can be driven by the motor shaft, and the impact assembly is at least partially arranged in the accommodating space; the transmission assembly also includes a third transmission member for transmitting the power of the motor shaft to the impact assembly; the exhaust device also includes a second exhaust assembly arranged on the first gear box; the buffer mechanism includes a second buffer assembly that cooperates with the second exhaust assembly; in a direction perpendicular to the motor axis, the second exhaust assembly is arranged on the lower side of the third transmission member.

[0014] Furthermore, the second exhaust component includes: a second exhaust inlet for guiding the airflow and a second exhaust outlet for exhausting the airflow, and a second exhaust channel connecting the second exhaust inlet and the second exhaust outlet; the second buffer component includes a second guide portion for guiding the airflow flowing basically along the direction of the motor axis to flow along a third air intake direction to the second exhaust inlet.

[0015] Furthermore, the electric hammer also includes: a fan, which can rotate with the motor shaft, and when the fan rotates, a heat dissipation airflow is formed for dissipating the heat of the electric hammer; an air guide cover, which is used to guide the heat dissipation airflow; the second exhaust component also includes a second receiving groove, which is arranged on the outside of the second exhaust outlet; the second exhaust outlet is fixedly connected to the first gear box or is integrally formed, and the second receiving groove is fixedly connected to the air guide cover or is integrally formed.

[0016] Furthermore, a boss extending upward along the motor axis is fixedly connected or integrally formed on the first gearbox, and the second exhaust channel is at least partially arranged in the boss; wherein the boss is basically conical, and the airflow flows along the outer surface of the boss to form a second guide portion for the boss.

[0017] Furthermore, the electric hammer also includes: an impact assembly that can be driven by the motor shaft, and the impact assembly is at least partially arranged in the accommodating space; the transmission assembly also includes a third transmission member for transmitting the power of the motor shaft to the impact assembly; the exhaust device also includes a second exhaust assembly arranged on the first gear box; the buffer mechanism includes a second buffer assembly that cooperates with the second exhaust assembly; in a direction perpendicular to the motor axis, the second exhaust assembly is arranged on the lower side of the third transmission member.

[0018] The benefits of the present invention lie in that: the invention provides an electric hammer, the gear box assembly of the electric hammer forms an accommodating space as the working chamber of the electric hammer, and an exhaust device is provided on the electric hammer to balance the internal and external pressures of the accommodating space, thereby ensuring the normal operation of the electric hammer and extending the service life of the electric hammer; a buffer mechanism is provided at the exhaust inlet in the accommodating space, and the buffer mechanism can extend the time for the airflow to flow out of the accommodating space to avoid the airflow being directly discharged into the external environment, thereby avoiding leakage of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the electric hammer of the present application;

[0020] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure of the electric hammer shown;

[0021] Figure 3 yes Figure 2 A partial enlarged view of

[0022] Figure 4 It is a schematic diagram of the internal structure of the electric hammer of the present application;

[0023] Figure 5 yes Figure 4 A schematic cross-sectional structure diagram of the gearbox shown;

[0024] Figure 6 This is a schematic diagram of the third gearbox structure of this application;

[0025] Figure 7 yes Figure 6 A magnified schematic diagram of part E;

[0026] Figure 8 yes Figure 6 a partial cross-sectional view of the structure shown;

[0027] Figure 9 This is a schematic diagram of the exploded structure of the electric hammer part of the present application;

[0028] Figure 10 yes Figure 9 a schematic diagram of a portion of the structure shown;

[0029] Figure 11 This is a schematic diagram of the three-dimensional structure of the first gearbox of the present application;

[0030] Figure 12 It is a schematic diagram of the cross-sectional structure of the first gearbox of the present application. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 The electric hammer 100 shown is a commonly used electric tool that can drive a functional element to rotate. The functional element can be a drill bit, so that the electric hammer 100 can drive the functional element to drill holes in hard materials such as walls, concrete, bricks, and stones.

[0033] In order to clearly illustrate the technical solution of this application, the following definitions are made: Figure 1 Up, down, front, back, left and right shown.

[0034] like Figures 1 to 3 As shown, the electric hammer 100 includes: a housing 110 , a gear box assembly 120 , a motor 130 , an energy source 140 , a switch assembly 150 , a transmission assembly 160 , an output assembly 170 , an impact assembly 180 and an exhaust device 20 .

[0035] The housing 110 defines a housing cavity for accommodating the various components within the rotary hammer 100. Specifically, the gearbox assembly 120, motor 130, transmission assembly 160, output assembly 170, impact assembly 180, and exhaust device 20 are at least partially disposed within the housing cavity. A handle 111 is formed or connected to the housing 110 for the user to grasp. The user can operate the rotary hammer 100 by grasping the handle 111.

[0036] The switch assembly 150 is mounted on the housing 110 . Specifically, the switch assembly 150 is mounted on the handle portion 111 . This allows the user to trigger the switch assembly 150 relatively easily when holding the handle portion 111 , thereby facilitating operation.

[0037] The gearbox assembly 120 is fixedly mounted within the housing 110 and defines a storage space 124, which serves as the working chamber of the rotary hammer 100. The impact assembly 180 and the output assembly 170 are at least partially disposed within the storage space 124. Specifically, the gearbox assembly 120 includes a first gearbox 121, a second gearbox 122, and a third gearbox 123 connecting the first and second gearboxes 121, 122. The first, second, and third gearboxes 121, 122, and 123 form the storage space 124. The third gearbox 123 is positioned above the first gearbox 121 in the vertical direction. In the front-to-back direction, the second gearbox 122 is positioned in front of the third gearbox 123. The third gearbox 123 also has an oil inlet 1231 formed on the top of the third gearbox 123 for injecting oil into the storage space 124.

[0038] The motor 130 is used to provide power to the rotary hammer 100 and includes a motor shaft 131 that can rotate around the motor axis 101. During operation, the motor 130 creates a high temperature and high pressure environment in the receiving space 124 of the rotary hammer 100 in a very short time, thereby expanding the gas in the receiving space 124 to form an airflow.

[0039] The transmission assembly 160 is used to transmit the power output by the motor shaft 131 to the output assembly 170 and the impact assembly 180 .

[0040] Output assembly 170 includes a sleeve 171, which can be driven by transmission assembly 160 to rotate substantially about first line 105. Specifically, sleeve 171 defines a receiving cavity for accommodating a functional element, into which the functional element can be inserted. Rotation of sleeve 171 about first line 105 drives the functional element to rotate.

[0041] Impact assembly 180 includes a rocker bearing 181 and an impact block 182. Rocker bearing 181 is driven by transmission assembly 160 to impact impact block 182, which in turn drives the functional element. Thus, when rocker bearing 181 reciprocates against impact block 182, impact block 182 intermittently delivers impact force to the functional element, enabling the functional element to be punched more efficiently.

[0042] The exhaust device 20 is used to balance the internal and external pressures of the accommodation space 124 formed by the gear box assembly 120 .

[0043] The energy source 140 is used to provide energy to the motor 130. The energy source 140 can be AC ​​or DC. In this embodiment, the energy source 140 uses AC. Figure 3As shown, the transmission assembly 160 is disposed within the accommodating space 124 and includes a first transmission member 161, a second transmission member 162, a third transmission member 163, a fourth transmission member 164, a fifth transmission member 165, and a connecting rod 166. The fifth transmission member 165 rotates synchronously with the motor shaft 131. During the rotation of the motor shaft 131, the fifth transmission member 165 can drive the fourth transmission member 164 and the third transmission member 163 to rotate. The third transmission member 163 drives the impact assembly 180 to move, thereby causing the impact block 182 to reciprocate. The first transmission member 161 rotates synchronously with the fourth transmission member 164. That is, as the fourth transmission member 164 rotates, the first transmission member 161 rotates accordingly. The second transmission member 162 can be driven by the first transmission member 161, that is, the second transmission member 162 can be driven to rotate by the fourth transmission member 164.

[0044] Specifically, the fifth transmission member 165 is fixedly connected to or integrally formed with the motor shaft 131. In this embodiment, the fifth transmission member 165 is integrally formed with the motor shaft 131. The fifth transmission member 165 is meshedly connected to the third transmission member 163, which can drive the rocker bearing 181 to move. The fifth transmission member 165 is meshedly connected to the fourth transmission member 164, and the connecting rod 166 and the fourth transmission member 164 can rotate synchronously. That is, the fourth transmission member 164 can transmit the power of the fifth transmission member 165 to the connecting rod 166. The connecting rod 166 is fixedly connected to or integrally formed with the first transmission member 161. In this embodiment, the connecting rod 166 is integrally formed with the first transmission member 161. In other words, in the front-to-back direction, the fourth transmission member 164 and the third transmission member 163 are respectively disposed on either side of the fifth transmission member 165. This allows the motor shaft 131 to simultaneously drive the third transmission member 163 and the fourth transmission member 164 when it rotates.

[0045] The first transmission member 161 is meshedly connected with the second transmission member 162, and the second transmission member 162 is fixedly connected to the sleeve 171 or is integrally formed. In this embodiment, the second transmission member 162 is fixedly connected to the sleeve 171, that is, the second transmission member 162 can transmit the power output by the motor shaft 131 to the sleeve 171, so that the sleeve 171 can rotate along the first straight line 105.

[0046] like Figure 2As shown, the exhaust device 20 is arranged in the accommodating cavity. The exhaust device 20 is used to discharge the gas expanded in the accommodating space 124 out of the accommodating space 124. The exhaust device 20 includes an exhaust inlet, an exhaust outlet, an exhaust channel connecting the exhaust inlet and the exhaust outlet, and a buffer mechanism. The exhaust inlet is arranged in the accommodating space 124, and specifically the exhaust inlet is arranged on the inner wall of the gearbox assembly 120. The exhaust outlet is arranged on the outer wall of the gearbox assembly 120. That is, the airflow in the accommodating space 124 flows through the exhaust inlet on the inner wall of the gearbox assembly 120 to the exhaust channel and finally discharged from the exhaust outlet, thereby discharging the expanded gas in the accommodating space 124, thereby reducing the pressure in the accommodating space 124 and preventing the expansion of the gas from destroying the sealing of the gearbox assembly 120. The buffer mechanism is arranged at the exhaust inlet, which is used to prolong the time for the airflow to be discharged from the accommodating space 124 to the outside of the accommodating space 124. In order to ensure the smooth operation of the internal components of the rotary hammer 100, grease is added to the storage space 124. Under normal circumstances, the grease is in liquid form. However, when the motor 130 runs for a long time, the temperature of the gas in the storage space 124 rises, forming a high-temperature and high-pressure environment, causing some of the grease to directly vaporize, and then the vaporized grease is discharged from the exhaust inlet to the outside of the storage space 124, causing abnormal leakage of the grease. By providing a buffer mechanism at the exhaust inlet, that is, the gas in the storage space 124 needs to pass through the buffer mechanism before it can be discharged from the exhaust inlet, the time it takes for the airflow to be discharged from the storage space 124 to the outside of the storage space 124 is extended, allowing the vaporized grease to re-liquefy, and then the grease to remain in the storage space 124, thus preventing abnormal leakage of the grease and its discharge with the airflow. This increases the service life of the rotary hammer 100 and reduces environmental pollution.

[0047] In fact, the buffer mechanism includes a guide portion that directs airflow in a first direction, and an exhaust inlet that directs airflow in a second direction, wherein the first and second directions are not aligned. In other words, the buffer structure redirects the airflow, forcing the airflow within storage space 124 to enter in the first direction, guided by the guide portion, before being discharged through the exhaust inlet. This prolongs the time it takes for the airflow to escape from storage space 124, thereby liquefying the gaseous grease in the airflow. This prevents abnormal grease leakage and discharge with the airflow, while also maintaining a balanced pressure and temperature within the storage space.

[0048] like Figures 2 to 9As shown, the exhaust device includes a first exhaust assembly 191 mounted on the third gearbox 123 and a first buffer assembly 201 that cooperates with the first exhaust assembly 191 to discharge air from within the receiving space 124 to the outside of the receiving space 124. In the vertical direction, the first exhaust assembly 191 is located above the first straight line 105 and is arranged circumferentially around the sleeve 171, essentially in the upper half of the third gearbox 123. Due to the high-speed rotation of the sleeve 171, the area surrounding it experiences extremely high temperatures and pressures, which prevents grease from accumulating there. Placing the first exhaust assembly 191 there allows for timely and rapid exhaust of air. Furthermore, the high temperature and pressure within the receiving space 124 accelerates the exhaust of air, achieving a balance between the temperature and pressure inside and outside the receiving space 124. Furthermore, since grease is less likely to accumulate in the upper half of the third gearbox 123, it is less likely to be discharged with the air.

[0049] The distance D between the first buffer assembly 201 and the front side 1621 of the second transmission member 162 along the first straight line 105 is greater than or equal to 7 mm and less than or equal to 25 mm. In this embodiment, the second transmission member 162 is specifically a metal gear fixedly mounted on a sleeve. Along the first straight line 105, the gear includes a front side 1621 and a rear side 1622 disposed opposite each other, with the rear side 1622 positioned closer to the oil filling port 1231 than the front side 1621. The meshing rotation of the gear and the first transmission member 161 inevitably results in extremely high temperatures and pressures in the area surrounding the gear. Therefore, the first exhaust assembly 191 should be located close to the gear, meaning that the first buffer assembly 201 should also be located close to the gear to achieve better heat dissipation. Furthermore, a distance D between the first buffer assembly 201 and the front side 1621 of the second transmission member 162 along the first straight line 105 of greater than or equal to 9 mm and less than or equal to 15 mm will achieve better results. Along the first straight line 105, the first exhaust assembly 191 is disposed between the oil inlet 1231 and the second transmission member 162. This arrangement facilitates the processing of the gearbox assembly. Furthermore, by disposing the first exhaust assembly 191 between the gear and the oil inlet 1231, the gap between the two is utilized, thereby optimizing the overall structural layout.

[0050] Please refer to Figure 8 and Figure 9 The first buffer assembly 201 includes a first guide portion 2011 for guiding airflow. The first guide portion 2011 and the third gearbox 123 form a first air inlet 2012 for air intake. The first guide portion 2011 extends substantially along the first air intake direction A. The first guide portion 2011 may be a guide rib integrally formed on the inner wall of the third gearbox 123.

[0051] Please refer to Figure 7 、 Figure 8 and Figure 10 The first exhaust assembly 191 includes a first exhaust inlet 1911 for exhausting air, a first exhaust outlet 1912 for exhausting air, a first exhaust channel 1913 connecting the first exhaust inlet 1911 and the first exhaust outlet 1912, and a first receiving groove 1914. The first exhaust channel 1913 extends substantially along the second air intake direction B. The first air intake direction A intersects the second air intake direction B. In this embodiment, the first air intake direction A is substantially the front-to-back direction, and the second air intake direction B is substantially the left-to-right direction. Of course, in other embodiments, the first air intake direction A may also be a direction at a certain angle to the front-to-back direction, and the second air intake direction B may also be a direction at a certain angle to the left-to-right direction. The first exhaust inlet 1911, the first exhaust outlet 1912, and the first exhaust channel 1913 can all be directly disposed on the sidewall of the third gearbox 123 and integrally formed with the third gearbox 123. Alternatively, the first exhaust inlet 1911, the first exhaust outlet 1912, and the first exhaust channel 1913 can be separate components from the third gearbox 123 and fixedly attached to the housing 110 through later assembly. The first receiving groove 1914 is sleeved outside the first exhaust outlet 1912 and is fixedly attached to or integrally formed with the housing 110. In this embodiment, the first receiving groove 1914 is integrally formed with the housing 110. The housing 110 is typically a plastic component, and the first receiving groove 1914 can be directly formed on the housing 110 through injection molding. The first receiving groove 1914 is arranged on the side wall of the housing 110. Through the structural arrangement that the first receiving groove 1914 is arranged on the outside of the first exhaust outlet 1912, a small amount of gaseous grease in the air flow discharged from the first exhaust outlet 1912 can be completely liquefied after contacting the first receiving groove 1914, and then remain in the first receiving groove 1914, thereby ensuring that the grease will not be discharged outside the housing 110, causing leakage, affecting user use, etc., thereby improving the user experience.

[0052] Furthermore, an adsorption member for adsorbing grease, such as felt, can be provided in the first exhaust passage 1913 to further prevent the grease in the accommodation space 124 of the gearbox assembly 120 from being discharged outside the accommodation space along with the air flow. Figure 8 As shown, the end of the first exhaust channel 1913 close to the inside of the third gear box 123 has a smaller diameter, and the end close to the outside of the second gear box 122 has a larger diameter. This makes it easy to insert the felt from the outside of the second gear box 122 into the first exhaust channel 1913. At the same time, the end with a smaller diameter in the first exhaust channel 1913 can reduce the flow rate of the airflow, thereby avoiding the large airflow causing the grease to flow out with the airflow.

[0053] In order to better balance the temperature and pressure inside and outside the accommodation space 124, the exhaust device can also be provided with a second exhaust component 192 and a second buffer component 202. Among them, the principles of the second exhaust component 192 and the second buffer component 202 are basically the same as those of the first exhaust component 191 and the first buffer component 201. The only difference is that the specific structures of the second exhaust component 192 and the second buffer component 202 are different. The corresponding parts of the first exhaust component 191 and the first buffer component 201 can be applied. The following only introduces the differences between the second exhaust component 192 and the second buffer component 202 and the first exhaust component 191 and the first buffer component 201. Please combine Figure 3 、 Figure 11 and Figure 12 The second exhaust assembly 192 and the second buffer assembly 202 are both arranged on the first gear box 121. The second buffer assembly 202 cooperates with the second exhaust assembly 192 to discharge the airflow in the accommodating space 124 to the outside of the accommodating space 124. In the direction along the motor axis 101, the second exhaust assembly 192 is arranged on the lower side of the third transmission member 163. The third transmission member 163 is a transmission member for driving the impact assembly 180. Since the third transmission member 163 rotates at a high speed after being driven by the motor shaft 131, extremely high temperature and pressure will be formed around the third transmission member 163. The second exhaust assembly 192 is arranged here, which can timely and quickly exhaust the gas, thereby achieving the purpose of balancing the temperature and pressure inside and outside the working chamber.

[0054] Please refer to Figure 11 and Figure 12 The second exhaust assembly 192 includes a second exhaust inlet 1921 for guiding airflow and a second exhaust outlet 1922 for exhausting airflow, as well as a second exhaust channel 1923 connecting the second exhaust inlet 1921 and the second exhaust outlet 1922; the second buffer assembly 202 includes a second guide portion 2021. Figure 12 As shown, the second guide portion 2021 is used to guide the airflow flowing substantially along the motor axis 101 to flow to the second exhaust inlet 1921 along the third air intake direction C. In this embodiment, the third air intake direction C may also be a curve.

[0055] Please continue to refer to Figure 11 and Figure 12 The first gear box 121 is fixedly connected or integrally formed with a boss extending upward along the motor axis 101. The boss is basically conical, and the airflow flows along the outer surface of the boss. The outer surface of the boss basically forms a second guide portion 2021 for guiding the airflow. Figure 12As shown, the second exhaust channel 1923 is at least partially disposed within the boss, and the second exhaust inlet 1921 is located on the boss to guide the airflow out. Preferably, the second exhaust inlet 1921, the second exhaust outlet 1922, the second exhaust channel 1923 and the boss can all be fixedly connected to the first gearbox 121 or integrally formed.

[0056] like Figure 12 As shown, the second exhaust channel 1923 is also a structure with one end larger than the other end. The diameter of the end of the second exhaust channel 1923 close to the inner side of the first gear box 121 is smaller, and the diameter of the end of the second exhaust channel 1923 close to the outer side of the first gear box 121 is larger. The end with a larger diameter is convenient for inserting the felt 106 (such as Figure 3 ) to absorb grease, and the end with a smaller diameter can control the flow of airflow to avoid a large amount of airflow outflow per unit time, which would cause a large amount of lubricating oil to flow out with the airflow.

[0057] like Figure 11 As shown, the inner surface of the first gearbox 121 is provided with a downwardly recessed groove 1211, and a boss is disposed at the bottom of the groove 1211. This arrangement allows the lubricating grease that liquefies when the rotary hammer 100 is not in operation to be stored in the groove 1211. This also prevents the boss from protruding from the inner surface of the first gearbox 121 and interfering with other components within the gearbox assembly 120. Furthermore, placing the boss at a lower position also facilitates airflow out of the accommodating space 124.

[0058] Please refer to Figure 3 The electric hammer 100 also includes a fan 132 and an air guide hood 133. The fan 132 can rotate with the motor shaft 131. When the fan 132 rotates, a heat dissipation airflow is formed to dissipate heat from the electric hammer 100. The air guide hood 133 is used to guide the heat dissipation airflow so that the airflow blown out by the fan 132 is blown toward the gear box assembly 120. The second exhaust assembly 192 also includes a second receiving groove 1924. The second receiving groove 1924 is sleeved on the outside of the second exhaust outlet 1922. The second receiving groove 1924 can support the felt 106 in the second exhaust channel 1923. The second receiving groove 1924 is fixedly connected to the air guide hood 133 or formed integrally.

[0059] Of course, as some other implementations, the second exhaust assembly and the second buffer assembly may also be provided only on the first gearbox.

[0060] The above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may also include more other equivalent embodiments. The scope of the present invention is determined by the scope of the appended claims and is not limited by the description in the embodiments.

Claims

1. An electric hammer, comprising: chassis: an output assembly disposed in the housing, the output assembly comprising a sleeve that rotates substantially about a first straight line; a motor, comprising a motor shaft rotating about a motor axis, wherein when the motor is running, airflow is generated in the housing; A gear box assembly is fixedly disposed in the housing, and the gear box assembly forms a receiving space; a transmission assembly, used to transmit power from the motor to the output assembly, the transmission assembly being disposed in the accommodation space; Its characteristics are: The electric hammer also includes: an exhaust device for balancing the internal and external pressures of the accommodating space, the exhaust device comprising: an exhaust inlet arranged in the accommodating space, an exhaust outlet arranged outside the accommodating space, and an exhaust channel connecting the exhaust inlet and the exhaust outlet; Wherein, a buffer mechanism is provided at the exhaust inlet, and the buffer mechanism is provided in the accommodation space; The buffer mechanism includes a guide portion, the guide portion guides the airflow to enter from a first direction, and the exhaust inlet guides the airflow to enter from a second direction, wherein the first direction and the second direction are not in a straight line; The gearbox assembly includes: a first gearbox, a second gearbox, and a third gearbox connected to the first gearbox and the second gearbox, wherein the first gearbox, the second gearbox, and the third gearbox form the accommodation space; The buffer mechanism includes a first buffer assembly; The exhaust device further includes: a first exhaust assembly provided on the third gearbox, the first exhaust assembly cooperating with the first buffer assembly to guide the airflow to be discharged from the accommodating space; The first exhaust assembly is arranged along the circumferential direction of the sleeve, and in a direction perpendicular to the motor axis, the first exhaust assembly is located on the upper side of the first straight line; The first buffer assembly includes a first guide portion for guiding the direction of the airflow, the first guide portion and the third gear box forming a first air inlet for air intake, and the first guide portion extends substantially along a first air intake direction; The first exhaust assembly includes: a first exhaust inlet for guiding the airflow and a first exhaust outlet for exhausting the airflow, and a first exhaust channel connecting the first exhaust inlet and the first exhaust outlet, the first exhaust inlet guiding the airflow to be discharged out of the accommodating space substantially along the second air inlet direction; wherein the first air intake direction intersects the second air intake direction; The first guide portion is a guide rib integrally formed on the inner wall of the third gear box; the first exhaust inlet, the first exhaust outlet and the first exhaust channel are directly arranged on the side wall of the third gear box and integrally formed with the third gear box.

2. The electric hammer according to claim 1, characterized in that: The electric hammer further includes an oil filling port provided on the third gear box for filling oil; The transmission assembly includes a first transmission member and a second transmission member that are meshed and connected, the first transmission member can be driven by the motor shaft, and the second transmission member is connected to the sleeve; In the direction along the first straight line, the first exhaust component is arranged between the oil filling port and the second transmission member.

3. The electric hammer according to claim 1, characterized in that: The transmission assembly includes a first transmission member and a second transmission member that are meshed and connected, the first transmission member is connected to the motor shaft, and the second transmission member is fixedly connected to the sleeve, and the second transmission member includes a front side surface and a rear side surface that are oppositely arranged along the first straight line direction; A distance D from the exhaust inlet to the front side of the second transmission member is greater than or equal to 7 mm and less than or equal to 25 mm.

4. The electric hammer according to claim 1, characterized in that: The first exhaust assembly further includes a first accommodating groove, which is sleeved on the outer side of the first exhaust outlet; The first exhaust outlet is fixedly connected to or integrally formed with the third gear box, and the first accommodating groove is fixedly connected to or integrally formed with the casing.

5. The electric hammer according to claim 1, characterized in that: The electric hammer further includes: an impact assembly capable of being driven by the motor shaft, wherein the impact assembly is at least partially disposed in the accommodation space; The transmission assembly further includes a third transmission member for transmitting power of the motor shaft to the impact assembly; The exhaust device further includes a second exhaust assembly disposed on the first gearbox; The buffer mechanism includes a second buffer assembly that cooperates with the second exhaust assembly; In the direction along the motor axis, the second exhaust component is arranged on the lower side of the third transmission member.

6. The electric hammer according to claim 5, characterized in that: The second exhaust assembly includes: a second exhaust inlet for guiding the airflow and a second exhaust outlet for exhausting the airflow, and a second exhaust channel connecting the second exhaust inlet and the second exhaust outlet; The second buffer assembly includes a second guide portion for guiding the airflow flowing substantially along the motor axis to flow to the second exhaust inlet along a third air intake direction.

7. The electric hammer according to claim 6, characterized in that: The electric hammer also includes: A fan, capable of rotating along with the motor shaft, and when the fan rotates, a heat dissipation airflow is formed for dissipating heat from the electric hammer; An air guide cover, used for guiding the heat dissipation airflow; The second exhaust assembly further includes a second accommodating groove, which is sleeved on the outer side of the second exhaust outlet; The second exhaust outlet is fixedly connected to or integrally formed with the first gear box, and the second receiving groove is fixedly connected to or integrally formed with the air guide cover.

8. The electric hammer according to claim 7, characterized in that: A boss extending upward along the motor axis is fixedly connected to or integrally formed on the first gearbox, and the second exhaust passage is at least partially disposed in the boss; The boss is substantially conical in shape, and the airflow flows along the outer surface of the boss so that the boss forms the second guide portion.

9. The electric hammer according to claim 1, characterized in that: The electric hammer further includes: an impact assembly capable of being driven by the motor shaft, wherein the impact assembly is at least partially disposed in the accommodation space; The transmission assembly further includes a third transmission member for transmitting power of the motor shaft to the impact assembly; The exhaust device further includes a second exhaust assembly disposed on the first gearbox; The buffer mechanism includes a second buffer assembly that cooperates with the second exhaust assembly; In a direction perpendicular to the motor axis, the second exhaust assembly is arranged on a lower side of the third transmission member.

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