Impact tool

Abstract

The application discloses an impact tool, comprising: a motor comprising or connected with a driving shaft for outputting power; an impact assembly comprising a main shaft and a spring sleeved on the main shaft; a transmission assembly for transmitting the power outputted by the driving shaft to the main shaft; the impact tool further comprises: a motor bearing for supporting the driving shaft; a main shaft bearing for supporting the main shaft; a projection of the spring on a reference plane perpendicular to an up-down direction overlaps with at least one of the motor bearing or the main shaft bearing. The above scheme can provide an impact tool with simple structure, compact volume and short overall length.

Description

Technical Field

[0001] This invention relates to a power tool, and more specifically to an impact tool. Background Technology

[0002] Impact tools are tools that output rotational motion with a certain impact frequency, such as impact wrenches and impact screwdrivers. Impact wrenches are used to tighten bolts and nuts, while impact screwdrivers are typically used to loosen or tighten screws. To achieve rotational motion with a certain impact frequency, impact tools need to include an output component for outputting rotational force, as well as an impact component for periodically impacting the output component. This results in a relatively large overall size for the impact tool. Summary of the Invention

[0003] The purpose of this invention is to provide an impact tool to solve the problem of large axial dimensions in existing impact tools.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An impact tool includes: a motor including or connected to a drive shaft for outputting power; an impact assembly including a spindle and a spring sleeved on the spindle; and a transmission assembly for transmitting the power output from the drive shaft to the spindle; wherein the impact tool further includes: a motor bearing for supporting the drive shaft; a spindle bearing for supporting the spindle; and the spring overlapping with the projection of at least one of the motor bearing or the spindle bearing onto a reference plane perpendicular to the vertical direction.

[0005] Furthermore, the main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed within the first groove.

[0006] Furthermore, the spindle also has a second groove, and the spring is at least partially disposed within the second groove.

[0007] Furthermore, the projections of the first groove and the second groove onto a reference plane perpendicular to the vertical direction overlap.

[0008] Furthermore, the transmission assembly includes at least an internal gear ring and planetary gears meshing with the internal gear ring.

[0009] Furthermore, the transmission assembly also includes a gearbox rear cover.

[0010] Furthermore, the spindle bearing is disposed between the spindle and the gearbox rear cover.

[0011] Furthermore, the inner ring of the main shaft bearing abuts against the first surface of the main shaft; the outer ring of the main shaft bearing abuts against the rear cover of the gearbox.

[0012] Furthermore, the spindle has a flange formed on its circumferential outer side, and the flange abuts against the spindle bearing in the front-rear direction.

[0013] Furthermore, the impact assembly also includes an impact block, which is movably sleeved on the main shaft.

[0014] Furthermore, when the impact block is in the first position, the projection of the impact block and the flange on a reference plane perpendicular to the vertical direction overlaps.

[0015] Furthermore, the spring is at its shortest length in the front-to-back direction when the impact block is in the first position.

[0016] An impact tool includes: a motor including or connected to a drive shaft for outputting power; an impact assembly including a spindle and a spring sleeved on the spindle; and a transmission assembly for transmitting the power output from the drive shaft to the spindle; wherein the impact tool further includes: a spindle bearing for supporting the spindle; the spindle bearing forming a receiving space extending in a front-rear direction, and the spring being at least partially disposed within the receiving space.

[0017] Furthermore, the impact tool also includes a motor bearing for supporting the drive shaft; the main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed within the first groove.

[0018] Furthermore, the drive shaft or the motor bearing is at least partially disposed within the receiving space in the front-to-back direction.

[0019] An impact tool includes: a motor, including or connected to a drive shaft for outputting power; a motor bearing, including a front motor bearing and a rear motor bearing; an impact assembly, including a spindle and a spring sleeved on the spindle; the ratio of the distance from the rear end face of the spring near the motor to the front end face of the rear motor bearing to the distance from the front end face of the front motor bearing to the front end face of the rear motor bearing is less than or equal to 1.

[0020] Furthermore, the main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed within the first groove.

[0021] Furthermore, the spindle also has a second groove, and the spring is at least partially disposed in the second groove in the front-rear direction.

[0022] Furthermore, the projections of the first groove and the second groove onto a reference plane perpendicular to the vertical direction overlap.

[0023] This invention provides an impact tool that simplifies the internal structure of the impact tool and shortens its length in the front-to-back direction by setting the motor bearing, spindle bearing, and spring to be located on one side of the planetary gear, and having overlapping areas in the projections of the motor bearing, spindle bearing, and spring on a reference plane perpendicular to the vertical direction. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the first embodiment of the impact tool in this invention; Figure 2a yes Figure 1 A partial cross-sectional view of the impact tool in the image; Figure 2b yes Figure 1 A partial view of another part of the impact tool; Figure 3 yes Figure 1 Structural diagram of the spindle and planetary gear set of the impact tool; Figure 4a yes Figure 3 Structural diagram of the spindle of the impact tool; Figure 4b yes Figure 3 Another structural diagram of the main shaft of the impact tool in the image; Figure 5a yes Figure 1 A schematic diagram of the first position of the impact block of the impact tool in the image; Figure 5b yes Figure 1 A schematic diagram of the second position of the impact block of the impact tool in the image; Figure 6 yes Figure 1 Structural diagram of the output shaft, output shaft bearing, and gearbox housing of the impact tool; Figure 7 yes Figure 6 Structural diagram of the output shaft and limiting component of the impact tool; Figure 8 This is a partial cross-sectional view of a second embodiment of the impact tool in this invention; Figure 9 This is a partial structural diagram of the second embodiment of the impact tool in this invention; Figure 10 yes Figure 8 A magnified view of point A in the image; Figure 11 This is a partial cross-sectional view of the third embodiment of the impact tool in this invention; Figure 12a yes Figure 11 A partial exploded view of the impact tool in the image; Figure 12b yes Figure 12aA partial exploded view of the impact tool from another perspective; Figure 13 This is a partial cross-sectional view of the fourth embodiment of the impact tool in this invention; Figure 14 yes Figure 13 A partial exploded view of the impact tool in the image; Figure 15 This is a partial cross-sectional view of the fifth embodiment of the impact tool in this invention; Figure 16 yes Figure 15 A partial exploded view of the impact tool in the image; Figure 17 This is a partial cross-sectional view of the sixth embodiment of the impact tool in this invention; Figure 18 yes Figure 17 A partial exploded view of the impact tool in the image. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] Figures 1 to 4b An impact tool 1, as a first embodiment of the present invention, is shown. The impact tool 1 includes a motor, a transmission assembly 12, an impact assembly 13, a power output assembly 14, and a housing 15. The motor, transmission assembly 12, impact assembly 13, and power output assembly 14 are arranged sequentially within the housing 15 in a front-to-back direction. The housing 15 also forms a grip portion 151 for user operation. One end of the grip portion 151 is connected to a power supply device 16. The power supply device 16 is used to connect to the power required for the operation of the impact tool 1. Optionally, the power supply device 16 can be an AC power source, connected to 120V or 220V AC mains via an AC plug. The power supply device 16 can also be a DC power source, for example, a battery pack detachably connected to the housing 15. In this embodiment, the impact tool 1 is specifically an impact screwdriver for tightening screws. It is understood that in other embodiments, the impact tool can also be an impact wrench for tightening bolts or nuts. Alternatively, in other embodiments, the impact tool can also be an impact drill for drilling holes.

[0027] The motor includes or is connected to a drive shaft 111 that can rotate relative to the housing 15 about a first axis 101 for outputting power. In some embodiments, the drive shaft 111 is the rotor of the motor. In this embodiment, the drive shaft 111 is drively connected to the rotor of the motor. It should be noted that the motor in this invention is specifically configured as an electric motor 11, which will be used to refer to the motor below, but this should not be construed as a limitation of the invention. The transmission assembly 12 includes a gearbox housing 123 and a gearbox rear cover 124, as well as a sun gear 121 disposed in the gearbox rear cover 124 and a planetary gear set 122 meshing and rotating with the sun gear 121. The sun gear 121 is fixedly connected to the drive shaft 111 to achieve synchronous rotation of the sun gear 121 and the drive shaft 111. The sun gear 121 and the planetary gear set 122 form meshing teeth for power transmission. The addendum circle diameter of the sun gear 121 is set smaller than that of the planetary gear set 122, such that the number of meshing teeth in the planetary gear set 122 is greater than the number of meshing teeth in the sun gear 121. The motor 11 drives the planetary gear set 122 to rotate via the sun gear 121. The planetary gear set 122 includes an internal gear ring 1221 and a plurality of planetary gears 1222 meshing with the internal gear ring 1221. The internal gear ring 1221 meshes around the periphery of the plurality of planetary gears 1222.

[0028] Impact assembly 13 is used to output impact force. Impact assembly 13 includes a main shaft 131 rotatable about a first axis 101 and a spring 132 sleeved on the main shaft 131. The spring 132 is used to buffer and reset when impact assembly 13 outputs impact force. Power output assembly 14 is impacted by impact assembly 13 to output power, realizing the function of impact tool 1. Power output assembly 14 includes an output shaft 141 disposed on the front side of main shaft 131 along the direction of first axis 101. Planetary gear set 122 also includes multiple planetary pins 1223. Planetary gears 1222 are sleeved on planetary pins 1223 and mesh with and rotate with planetary pins 1223. Planetary pins 1223 are also fixedly connected to main shaft 131 to transmit power output from drive shaft 111 to main shaft 131.

[0029] In this embodiment, the planetary pin 1223 is fixedly connected to the main shaft 131 using a cantilever beam fixing method. The planetary gear set 122 is provided with multiple planetary gears 1222, each planetary gear 1222 being fitted onto one end of a planetary pin 1223 extending in the front-rear direction so that the power on the planetary gear 1222 is transmitted to the planetary pin 1223. Specifically, the planetary gears 1222 and the planetary pin 1223 are connected by meshing gears. The other end of the planetary pin 1223 is fixedly disposed inside the main shaft 131 so that the main shaft 131 and the planetary pin 1223 can rotate simultaneously.

[0030] The impact tool 1 also includes a motor bearing and a spindle bearing 133. The motor bearing supports the drive shaft 111, and the spindle bearing 133 supports the spindle 131. The projections of the motor bearing and the spindle bearing 133 onto a reference plane perpendicular to the vertical direction overlap. In this embodiment, the motor bearing and the spindle bearing 133 are located in front of the planetary gear set 122 in the front-rear direction, and the planetary gear set 122 is located between the motor 111 and the motor bearing. A first groove 1311 is formed on the spindle 131, and a portion of the drive shaft 111 extends into the first groove 1311 and is positioned within it by the motor bearing. Preferably, the first groove 1311 is circular. The spindle bearings 133 are distributed circumferentially along the spindle 131 and are positioned between the spindle 131 and the gearbox rear cover 124. Specifically, the spindle 131 has a first surface 1318a, the inner ring of the spindle bearing 133 abuts against the first surface 1318a of the spindle 131, and the outer ring of the spindle bearing 133 abuts against the gearbox rear cover 124 to achieve circumferential limiting. A flange 1313 is formed on the outer circumferential side of the spindle 131, and the spindle bearing 133 abuts against the flange 1313 to achieve axial limiting.

[0031] A second groove 1312 is also formed on the spindle 131. Specifically, the second groove 1312 is annular and formed radially outside the first groove 1311. The second groove 1312 has an opening direction opposite to that of the first groove 1311 in the front-back direction. A spring 132, sleeved on the spindle 131, is at least partially disposed in the second groove 1312. Specifically, the projection of the spring 132 onto a reference plane perpendicular to the front-back direction lies between the projections of the motor bearing and the spindle bearing 133 onto the reference plane perpendicular to the front-back direction. The projections of the first groove 1311 and the second groove 1312 onto a reference plane perpendicular to the up-down direction overlap. The projections of the motor bearing, the spindle bearing 133, and the spring 132 onto the reference plane perpendicular to the up-down direction overlap. Through the above-described structural improvement, the length of the impact tool 1 in the front-back direction can be shortened.

[0032] In some embodiments, the motor 11 further includes a rear bearing 113, and the motor bearing in the above embodiments is a front bearing 112 in this embodiment. See details. Figure 2b As shown, the ratio of the distance from the rear end face 1321 of the spring 132 to the front end face 1131 of the rear bearing 113 of the motor to the distance from the front end face 1121 of the front bearing 112 of the motor to the front end face 1131 of the rear bearing 113 of the motor is less than or equal to 1. The main shaft bearing 133 has a receiving space (not shown) extending in the front-rear direction, and the spring 132 is at least partially disposed in the receiving space in the front-rear direction.

[0033] When the impact tool 1 performs its impact function, the reaction force applied to the spindle 131 in the front-to-back direction is first transmitted to the spindle bearing 133, and then transmitted to the gearbox housing 123 via the spindle bearing 133. Specifically, a flange 1313 is formed on the outer circumferential side of the spindle 131. The flange 1313 abuts against the spindle bearing 133 to limit the spindle 131 in the axial direction.

[0034] The impact assembly 13 also includes an impact block 134. The impact block 134 is supported on the spindle 131 and can slide relative to the spindle 131 in the front-rear direction. A spring 132 extends in the front-rear direction and is sleeved on the impact block 134 to provide cushioning during the impact process and to reset the impact block 134. The spindle 131 also has a cam groove 1314, and a cam ball 1315 is disposed in the cam groove 1314 and engages with the impact block 134. When the spindle 131 rotates, the movement of the cam ball 1315 in the cam groove 1314 allows the impact block 134 to move relative to the spindle 131 in the front-rear direction. Specifically, during operation, the impact tool 1 has a first position close to the spindle bearing 133 and a second position away from the spindle bearing 133. Figure 5a The first position is shown. Figure 5b The second position is shown. When the impact block 134 is in the first position, the spring 132 is at its shortest length in the front-to-back direction. When the impact block 134 is in the second position, the spring 132 is at its longest length in the front-to-back direction. When the impact block 134 is in the first position, the impact block 134 and the flange 1313 of the main shaft 131 have an overlapping area on a reference plane perpendicular to the up-down direction.

[0035] like Figure 6 and Figure 7As shown, the power output assembly 14 also includes an output shaft bearing 142 for supporting the output shaft 141 and a limiting member 143 for axially limiting the output shaft 141. The output shaft bearing 142 is directly sleeved on the output shaft 141. When the impact tool 1 performs an impact operation, the output shaft 141 is subjected to an axial reaction force F. The line of action 144 of the axial reaction force F is guided from the output shaft 141 to the limiting member 143, then through the output shaft bearing 142, and finally reaches the gearbox housing 123. Specifically, the output shaft 141 has a first groove 1411 distributed circumferentially, and the limiting member 143 is partially disposed within the first groove 1411. In this embodiment, the limiting member 143 is configured as a clip, such as a C-type clip or a circular clip. The output shaft bearing 142 has a limiting portion 1421 that can limit the output shaft 141 in the front-rear direction. Specifically, in this embodiment, a boss, namely the aforementioned limiting portion 1421, is formed on the outer side of the output shaft bearing 142. The boss is disposed on the front side of the gearbox housing 123 and abuts against the gearbox housing 123 in the front-rear direction. When the impact tool 1 operates, the axial reaction force F applied to the output shaft 141 is transmitted to the gearbox housing 123 through the limiting member 143 and the limiting portion 1421 on the output shaft bearing 142. Since the axial reaction force F applied to the output shaft 141 is transmitted to the gearbox housing 123 through the limiting member 143 and the limiting portion 1421 on the output shaft bearing 142, the spindle will not bear the axial reaction force from the output shaft. During assembly, the output shaft 141 is first installed into the gearbox housing 123 from back to front, then the output shaft bearing 142 is installed between the output shaft 141 and the gearbox housing 123 from front to back, and finally the limiting member 143 is installed into the first groove 1411 on the output shaft 141. In this embodiment, the output shaft bearing 142, gearbox housing 123, and output shaft 141 overlap in their projections on a reference plane perpendicular to the vertical direction.

[0036] Figure 8 The second embodiment of the present invention is shown. The impact tool 2 includes a motor 21, a transmission assembly 22, an impact assembly 23, a power output assembly 24, and a housing 25. The motor 21, the transmission assembly 22, the impact assembly 23, and the power output assembly 24 are arranged sequentially in the front-to-back direction within the housing 25.

[0037] See Figure 8 and Figure 9As shown, the transmission assembly 22 includes at least a planetary gear set 222, which includes planetary pins 2223, an internal gear ring 2221, and a plurality of planetary gears 2222 meshing with the internal gear ring 2221. The internal gear ring 2221 meshes around the periphery of the plurality of planetary gears 2222. One difference from the first embodiment described above is that the main shaft 231 forms a receiving space 2319, and the planetary gears 2222 and planetary pins 2223 are at least partially disposed within the receiving space 2319. Specifically, one end of the planetary pin 2223 is fixedly connected to a first side portion 2316 of the main shaft 231, and the other end of the planetary pin 2223 is fixedly connected to a second side portion 2317 of the main shaft 231. It can be understood that when the drive shaft 211 drives the sun gear 221 to rotate, the sun gear 221 drives the planet gear 2222 to rotate, and the planet gear 2222 drives the planet gear pin 2223 to rotate. Since the planet gear pin 2223 is fixedly connected to the first side 2316 and the second side 2317 of the main shaft 231, the main shaft 231 can rotate synchronously with the planet gear pin 2223.

[0038] The impact tool 2 includes a motor bearing 212 for supporting the drive shaft 211 and a spindle bearing 233 for supporting the spindle 231. The motor bearing 212 and spindle bearing 233 are located in the front of the planetary gear set 222 in the front-rear direction, and the planetary gear set 222 is located between the motor 21 and the motor bearing 212. A first groove 2311 is formed on the spindle 231, and a portion of the drive shaft 211 extends into the first groove 2311 and is positioned within it by the motor bearing 212. The first groove 2311 communicates with and is located in front of the receiving space 2319. Preferably, the first groove 2311 is circular. It is understood that the drive shaft 211 passes through the receiving space 2319 in the front-rear direction before extending into the first groove 2311 for positioning. The spindle bearing 233 is distributed circumferentially along the spindle 231 and is located between the spindle 231 and the gearbox rear cover 224. Specifically, the spindle 231 has a first surface 2318a, and the spindle bearing 233 abuts against the first surface 2318a of the spindle 231 and the gearbox rear cover 224 to achieve circumferential limiting. A flange 2313 is formed on the outer circumferential side of the spindle 231, and the spindle bearing 233 abuts against the flange 2313 to achieve axial limiting. A second groove 2312 is also formed on the spindle 231. Specifically, the second groove 2312 is annular and formed radially outside the first groove 2311. A spring 232, sleeved on the spindle 231, is at least partially disposed in the second groove 2312. In this embodiment, in the projections of the spring 232, the motor bearing 212, and the spindle bearing 233 onto a reference plane perpendicular to the front-rear direction, the projection of the spring 232 is located between the projections of the motor bearing 212 and the spindle bearing 233. On the other hand, the projections of the motor bearing 212, the spindle bearing 233, and the spring 232 onto a reference plane perpendicular to the vertical direction overlap. The structure in this embodiment can significantly reduce the axial dimension of the assembly structure between the drive shaft and the spindle, thereby shortening the axial dimension of the impact tool.

[0039] In this embodiment, see Figure 10 As shown, there is a reserved gap 2318c between the gearbox rear cover 224 and the second surface 2318b of the spindle 231 in the front-rear direction. When the impact tool 2 performs the impact function, the spindle 231 bears the force in the front-rear direction. Due to the presence of the reserved gap 2318c, the spindle 231 will not contact the gearbox rear cover 224 when bearing axial force, thereby avoiding the generation of large friction between the spindle 231 and the gearbox rear cover 224, so as not to reduce the life of the gearbox rear cover, affect the output function of the impact tool, and at the same time avoid the impact on the user's feel caused by the above friction.

[0040] Figure 11A third embodiment of the present invention is shown. The impact tool 3 includes a motor, a transmission assembly, an impact assembly, a power output assembly, and a housing. The motor, transmission assembly, impact assembly, and power output assembly are arranged sequentially within the housing in a front-to-back direction. These components are conventional and have been described in the first and second embodiments. The motor includes a drive shaft 311 that rotates relative to the housing about a first axis 301. The transmission assembly includes a sun gear 321 and a planetary gear set 322 that meshes with and rotates with the sun gear 321. The sun gear 321 is fixedly connected to the drive shaft 311 to achieve synchronous rotation of the sun gear 321 and the drive shaft 311. The sun gear 321 and the planetary gear set 322 form meshing teeth for transmitting power. The tip circle diameter of the sun gear 321 is set smaller than the tip circle diameter of the planetary gear set 322, such that the number of meshing teeth in the planetary gear set 322 is greater than the number of meshing teeth in the sun gear 321. The motor drives the planetary gear set 322 to rotate via the sun gear 321. The planetary gear set 322 includes an internal gear ring 3221 and planetary gears 3222 that mesh with the internal gear ring 3221. There are several planetary gears 3222, and the internal gear ring 3221 meshes around the periphery of several planetary gears 3222.

[0041] The impact assembly is used to output impact force. The impact assembly includes a main shaft 331 rotatable about a first axis 301 and a spring 332 sleeved on the main shaft 331. The spring 332 serves to buffer and reset when the impact assembly outputs impact force. The power output assembly is impacted by the impact assembly to output power, realizing the function of the impact tool 3. The power output assembly includes an output shaft 341 disposed on the front side of the main shaft 331 along the direction of the first axis 301. The planetary gear set 322 also includes multiple planetary pins. The planetary pins are fixedly connected to the planetary gears 3222 and the main shaft 331 to transmit the power output from the drive shaft 311 to the main shaft 331. The installation method of the planetary pins described above is similar to that in the second embodiment and will not be described in detail here.

[0042] The impact tool 3 also includes a gearbox rear cover 324 and a gearbox housing 323. See also Figures 11 to 12bAs shown, in this embodiment, the gearbox rear cover 324 forms a first receiving space 3232a, and a portion of the main shaft 331 is disposed within the first receiving space 3232a. Specifically, the main shaft 331 has a support portion 3320 formed on its circumferential outer side, and the support portion 3320 extends into the first receiving space 3232a in the front-rear direction. The impact assembly includes a main shaft bearing 333 for supporting the main shaft 331, and the main shaft bearing 333 is also disposed within the aforementioned receiving space. Specifically, the outer ring of the main shaft bearing 333 abuts against the inner wall of the first receiving space 3232a, and the inner ring of the main shaft bearing 333 abuts against the support portion 3320, thereby achieving circumferential positioning of the main shaft bearing 333. The gearbox rear cover 324 also forms a second receiving space 3232b. The motor bearing 312 is disposed within the second receiving space 3232b. Specifically, the outer ring of the motor bearing 312 abuts against the inner wall of the second accommodating space 3232b, and the inner ring of the motor bearing 312 abuts against the drive shaft 311, thereby achieving circumferential limiting of the drive shaft 311. In this embodiment, the projections of the second accommodating space 3232b and the support portion 3320 onto a reference plane perpendicular to the vertical direction overlap. The projections of the motor bearing 312 and the main shaft bearing 333 onto a reference plane perpendicular to the vertical direction also overlap.

[0043] The planetary gear set 322 has multiple planetary gears 3222, each planetary gear 3222 being fitted onto a planetary pin 3223 extending in the front-rear direction so that the power of the planetary gear 3222 is transmitted to the planetary pin 3223. Specifically, the planetary gears 3222 and the planetary pins 3223 are connected by meshing gears. The main shaft 331 has a receiving space 3319 for accommodating the planetary gears 3222 and the planetary pins 3223. One end of the planetary pin 3223 is fixedly connected to a first side portion 3316 of the main shaft 331, and the other end of the planetary pin 3223 is fixedly connected to a second side portion 3317 of the main shaft 331. It is understood that when the drive shaft 311 drives the sun gear 321 to rotate, the sun gear 321 drives the planet gears 3222 to rotate, and the planet gears 3222 drive the planetary pins 3223 to rotate. Since the planetary pins 3223 are fixedly connected to the first side 3316 and the second side 3317 of the main shaft 331, the main shaft 331 can rotate synchronously with the planetary pins 3223. In this embodiment, the planetary pins 3223 are fixed to the main shaft 331 by C-rings to prevent the planetary pins 3223 from sliding relative to the main shaft 331 or even detaching during the impact process.

[0044] In this embodiment, the motor bearing 312 is disposed within the second receiving space 3232b formed by the gearbox rear cover 324, while the spindle bearing 333 is disposed within the first receiving space 3232a formed by the gearbox rear cover 324. Furthermore, the projections of the motor bearing 312 and the spindle bearing 333 onto a reference plane perpendicular to the vertical direction overlap. Through these structural improvements, the length of the impact tool in the longitudinal direction can be shortened, and the lifespan of the motor bearing can be increased by improving the positioning method, while also simplifying the assembly process.

[0045] Figure 13 and Figure 14 A fourth embodiment of the present invention is shown, wherein the output power assembly 44 further includes an output shaft bearing 442 for supporting the output shaft 441 and a limiting member 443 for axially limiting the output shaft 441. The output shaft bearing 442 is directly sleeved on the output shaft 441. The output shaft 441 has a first groove 4411 distributed circumferentially, and the limiting member 443 is partially disposed within the first groove 4411. In this embodiment, the limiting member 443 is configured as a clip, such as a C-type clip or a circular clip. The output shaft bearing 442, connected to the limiting portion 4421, can limit the output shaft 441 in the front-rear direction. In this embodiment, the output shaft bearing 442 has a second groove 4422, and the gearbox housing 423 has a third groove 4233 disposed opposite to the second groove 4422. The limiting portion 4421 is simultaneously disposed in both the second groove 4422 and the third groove 4233 to achieve axial limiting of the gearbox housing 423 and the output shaft bearing 442. It is understood that the aforementioned limiting part 4421 is configured as a clip, such as a C-type clip or a circular clip. When the impact tool is working, the line 444 of action of the axial reaction force F applied to the output shaft 441 is transmitted to the gearbox housing 423 through the limiting part 443 and the limiting part 4421 on the output shaft bearing 442, ensuring that the spindle does not bear the axial reaction force from the output shaft. During the assembly process, the output shaft 441 is first installed into the gearbox housing 423 from back to front, then the output shaft bearing 442 is installed between the output shaft 441 and the gearbox housing 423 from front to back, and finally the limiting part 443 is installed into the first groove 4411 on the output shaft 441. It should be noted that when installing the output shaft bearing 442 between the output shaft 441 and the gearbox housing 423, the clip needs to be installed into the second groove 4422 first. Since the clip can deform, the assembly can be completed with specific tooling. In this embodiment, the overlapping area of ​​the output shaft bearing 442, gearbox housing 423, and output shaft 441 on a reference plane perpendicular to the vertical direction. Further, the length of the aforementioned overlapping area in the front-rear direction is greater than or equal to 1 mm and less than or equal to 8 mm.

[0046] Figure 15 A fifth embodiment of the invention is shown, in which the power output assembly 54 further includes an output shaft bearing 542 for supporting the output shaft 541 and a limiting member 543 for axially limiting the output shaft 541. The output shaft bearing 542 is directly sleeved on the output shaft 541. One difference from the first or fourth embodiment described above is that the output shaft 541 and the limiting member 543 are integrally formed. Specifically, the limiting member 543 on the output shaft 541 is an axially extending protrusion that abuts against the output shaft bearing 542 in the front-rear direction. The output shaft bearing 542, connected to the limiting portion 5421, can limit the output shaft 541 in the front-rear direction. See also... Figure 16 As shown, in this embodiment, the output shaft bearing 542 has a second groove 5422, and the gearbox housing 523 has a third groove 5233 opposite to the second groove 5422. A limiting part 5421 is simultaneously disposed in both the second groove 5422 and the third groove 5233 to limit the axis of the gearbox housing 523 and the output shaft bearing 542. It can be understood that the limiting part 5421 is configured as a clip, such as a C-type clip or a circular clip. When the impact tool is working, the axial reaction force applied to the output shaft 541 is transmitted to the gearbox housing 523 through the protrusion on the output shaft 541, the output shaft bearing 542, and the limiting part 5421 on the gearbox housing 523, ensuring that the spindle does not bear the axial reaction force from the output shaft.

[0047] The difference between this embodiment and the previous embodiment is that the output shaft 541 is a split type, comprising an anvil 5411 and a shaft 5412. The anvil 5411 is fitted onto the shaft 5412 and rotates synchronously. During assembly, the shaft 5412 is first inserted into the gearbox housing 523 from front to back and connected to the anvil 5411. It should be noted that before inserting the shaft 5412 into the gearbox housing 523 from front to back, the clip needs to be installed into the second groove 5422 on the output shaft bearing 542 and fitted onto the shaft 5412. Since the clip can deform, assembly can be completed using specific tooling. In this embodiment, the overlapping area of ​​the output shaft bearing 542, the gearbox housing 523, and the output shaft 541 on a reference plane perpendicular to the vertical direction. Further, the length of the aforementioned overlapping area in the front-rear direction is greater than or equal to 1 mm and less than or equal to 8 mm.

[0048] Figure 17 A sixth embodiment of the present invention is shown, wherein the power output assembly 64 includes an output shaft bearing 642 for supporting an output shaft 641 and a limiting member 643 for axially limiting the output shaft 641. The output shaft bearing 642 is directly sleeved on the output shaft 641. One difference from the embodiments described above is that, see [reference needed] Figure 18As shown, the power output assembly 64 also includes a bushing 645 integrally formed with the gearbox housing 623. In this embodiment, the bushing 645 is made of metal and is die-cast onto the gearbox housing 623 as an insert. A fourth groove 6452 is formed on the first end face 6451 of the bushing 645. In this embodiment, the output shaft bearing 642 is configured as a planar bearing. The balls in the output shaft bearing 642 are disposed in the fourth groove 6452, ensuring that the balls on the output shaft bearing 642 can roll within the fourth groove 6452. The output shaft 641 has a first groove 6411 distributed circumferentially, and a limiting member 643 is partially disposed within the first groove 6411 and abuts against the output shaft bearing 642 in the front-rear direction. In this embodiment, the limiting member 643 is configured as a clip, such as a C-type clip or a circular clip.

[0049] During assembly, the output shaft bearing 642 is first installed into the bushing 645, then the limiting member 643 is installed into the first groove 6411 on the output shaft 641, and finally the gearbox housing 623 is installed from back to front onto the output shaft 641. In this embodiment, the gearbox housing has an impact protection function when the impact tool impacts.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An impact tool, comprising: A motor, including or connected to a drive shaft for outputting power; An impact assembly, comprising a spindle and a spring sleeved on the spindle; A transmission assembly for transmitting the power output from the drive shaft to the main shaft; The impact tool further includes: Motor bearings, used to support the drive shaft; Spindle bearing, used to support the spindle; The projections of the spring, the motor bearing, and the main shaft bearing on a reference plane perpendicular to the vertical direction overlap. The main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed in the first groove; The spindle also has a second groove, and the spring is at least partially disposed within the second groove.

2. The impact tool according to claim 1, characterized in that, The projections of the first groove and the second groove onto a reference plane perpendicular to the vertical direction overlap.

3. The impact tool according to claim 1, characterized in that, The transmission assembly includes at least an internal gear ring and planetary gears that mesh with the internal gear ring.

4. The impact tool according to claim 3, characterized in that, The transmission assembly also includes a gearbox rear cover.

5. The impact tool according to claim 4, characterized in that, The main shaft bearing is disposed between the main shaft and the gearbox rear cover.

6. The impact tool according to claim 5, characterized in that, The inner ring of the main shaft bearing abuts against the first surface of the main shaft; the outer ring of the main shaft bearing abuts against the rear cover of the gearbox.

7. The impact tool according to any one of claims 1-6, characterized in that, The impact assembly also includes an impact block, which is movably fitted onto the spindle.

8. The impact tool according to claim 7, characterized in that, The main shaft has a flange formed on its circumferential outer side, and the flange abuts against the main shaft bearing in the front-rear direction.

9. The impact tool according to claim 8, characterized in that, When the impact block is in the first position, the projection of the impact block and the flange on a reference plane perpendicular to the vertical direction overlaps.

10. The impact tool according to claim 9, characterized in that, The spring is at its shortest length in the front-to-back direction when the impact block is in the first position.

11. An impact tool, comprising: A motor, including or connected to a drive shaft for outputting power and rotating about a first axis; An impact assembly, comprising a spindle and a spring sleeved on the spindle; A transmission assembly for transmitting the power output from the drive shaft to the main shaft; The impact tool further includes: Spindle bearing, used to support the spindle; The spindle bearing has a receiving space extending in the front-rear direction, and the spring is at least partially disposed in the receiving space; the spindle has a flange perpendicular to the first axis direction formed on its circumferentially outer side, and the flange abuts against the front surface of the spindle bearing in the front-rear direction.

12. The impact tool according to claim 11, characterized in that, The impact tool also includes a motor bearing for supporting the drive shaft; The main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed within the first groove.

13. The impact tool according to claim 12, characterized in that, The drive shaft or the motor bearing is at least partially disposed within the receiving space in the front-to-back direction.

14. An impact tool, comprising: A motor, including or connected to a drive shaft for outputting power and rotating about a first axis; Motor bearings, including front motor bearings and rear motor bearings; An impact assembly, comprising a spindle and a spring sleeved on the spindle; The impact tool further includes: Spindle bearing, used to support the spindle; Its features are, The ratio of the distance from the rear end face of the spring near the motor to the front end face of the rear bearing of the motor to the distance from the front end face of the front bearing of the motor to the front end face of the rear bearing of the motor is less than or equal to 1; the main shaft has a flange perpendicular to the first axis direction formed on its circumferential outer side, and the flange abuts against the front surface of the main shaft bearing in the front-rear direction.

15. The impact tool according to claim 14, characterized in that, The main shaft has a first groove, and the drive shaft or the motor bearing is at least partially disposed within the first groove.

16. The impact tool according to claim 15, characterized in that, The spindle also has a second groove, and the spring is at least partially disposed in the second groove in the front-rear direction.

17. The impact tool according to claim 16, characterized in that, The projections of the first groove and the second groove onto a reference plane perpendicular to the vertical direction overlap.

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