Torque output tool

Abstract

The application provides a torque output tool, comprising an output shaft for outputting torque, a motor comprising a rotor shaft rotating around a first axis, a transmission assembly for transmitting the output of the motor to the output shaft, and a gear box for accommodating the transmission assembly. The transmission assembly comprises a first planetary gear set comprising a first planetary gear, a first planetary gear carrier for mounting the first planetary gear, and a first stage ring gear meshing with the first planetary gear, and a second planetary gear set comprising a second planetary gear and a second planetary gear carrier for mounting the second planetary gear. The gear box is arranged at one end of the motor and supports the rotor shaft. The torque output tool further comprises a positioning member supported by the gear box and positioning the first stage ring gear in the direction of the first axis. The transmission assembly of the torque output tool is more stable, and the overall size of the torque output tool is compact.

Description

Technical Field

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

[0002] Torque output tools equipped with transmission components typically utilize planetary gear trains for power transmission. The first internal gear ring in the planetary gear train is prone to movement, thus affecting the transmission efficiency of the transmission component. How to effectively fix the first internal gear ring without increasing the size of the torque output tool is a problem that urgently needs to be solved. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a torque output tool with a more stable transmission mechanism and a compact overall size.

[0004] To achieve the above-mentioned main objectives, the present invention provides a torque output tool, comprising: an output shaft for outputting torque; a motor including a rotor shaft rotating about a first axis; a transmission assembly for transmitting the output of the motor to the output shaft; and a gearbox for housing the transmission assembly. The transmission assembly includes: a first planetary gear set including: a first planetary gear, a first planetary gear carrier, and a first-stage internal gear ring, wherein the first planetary gear is driven by the motor, the first planetary gear carrier is used to mount the first planetary gear, and the first-stage internal gear ring meshes with the first planetary gear; a second planetary gear set including: a second planetary gear and a second planetary gear carrier, the second planetary gear carrier being used to mount the second planetary gear; and the gearbox being disposed at one end of the motor and supporting the rotor shaft. The torque output tool further includes: a positioning element supported by the gearbox and positioning the first-stage internal gear ring in the direction of the first axis.

[0005] Optionally, the positioning element is a positioning pin, which extends along the direction of the first axis.

[0006] Optionally, the second planetary gear set may also include a second-stage internal gear ring, with locating pins positioned circumferentially on the second-stage internal gear ring.

[0007] Optionally, the diameter of the gearbox at the first-stage internal gear ring is less than or equal to 46 mm and greater than or equal to 40 mm.

[0008] Optionally, the gearbox also forms a mounting groove that extends along the direction of the first axis, and the first-stage internal gear ring also includes a protrusion that can be inserted into the mounting groove to limit the first-stage internal gear ring.

[0009] Optionally, the positioning element abuts against the protrusion.

[0010] Optionally, the transmission assembly also includes a third planetary gear set, which includes a third planetary gear, a drive wheel, and a third-stage internal gear ring. The drive wheel is used to mount the third planetary gear, and the third-stage internal gear ring meshes with the third planetary gear. A second planetary gear set is disposed between the first planetary gear set and the third planetary gear set.

[0011] Optionally, the positioning element is a positioning pin, which extends radially along the first axis.

[0012] Optionally, the gearbox forms a mounting groove, the first-stage internal gear ring forms a flat portion, and the locating pin is located between the mounting groove and the flat portion.

[0013] Optionally, the dimension of the gearbox in the axial direction of the first axis is greater than or equal to 43 mm and less than or equal to 55 mm.

[0014] Beneficial effects: The present invention positions the first layer of internal gear ring by the joint action of the positioning component and the gearbox, and the gearbox also supports the motor, which makes the structure of the transmission component stable and the torque output tool compact. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the torque output tool provided in the first embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A cross-sectional structural diagram of the provided torque output tool;

[0017] Figure 3a yes Figure 1 An exploded view of a portion of the transmission assembly of the provided torque output tool;

[0018] Figure 3b yes Figure 1 A cross-sectional view of the locking pin of the transmission assembly of the provided torque output tool in the unlocked position;

[0019] Figure 3c yes Figure 1 A cross-sectional view of the locking pin of the transmission assembly of the provided torque output tool in the locked position;

[0020] Figure 4 yes Figure 1 A schematic diagram of the separator and transmission wheel of the provided torque output tool;

[0021] Figure 5 yes Figure 1 A schematic diagram of the separator component of the provided torque output tool;

[0022] Figure 6 yes Figure 1A cross-sectional schematic diagram of the transmission assembly of the provided torque output tool;

[0023] Figure 7 yes Figure 1 An exploded view of some transmission components of the provided torque output tool;

[0024] Figure 8 yes Figure 1 A schematic diagram of the first gearbox of the provided torque output tool;

[0025] Figure 9 yes Figure 1 A schematic diagram of the separator limiting the first-stage internal gear ring of the provided torque output tool;

[0026] Figure 10 A three-dimensional structural schematic diagram of the transmission component of the torque output tool provided in the second embodiment of the present invention;

[0027] Figure 11 yes Figure 10 A schematic diagram of the planar structure of the transmission component of the provided torque output tool. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. Figure 1 The torque output tool 100 shown in the first embodiment is a torque output tool, which is a handheld power tool. The torque output tool 100 of the present invention is exemplified by an electric screwdriver; of course, the torque output tool 100 can also be other tools that can output torque, such as an electric drill, or a tool that combines the functions of a screwdriver and an electric drill, or other tools that convert torque into other forms of motion.

[0030] Reference Figure 2 The torque output tool 100 may include: a housing 110, a motor 120, a transmission assembly 200, and an output assembly. The motor 120 is housed in the housing 110 and is used to convert the energy provided by the energy source into power output to the transmission assembly 200. The motor 120 includes a rotor shaft 121 that rotates about a first axis 101.

[0031] A transmission assembly 200 is disposed between the motor 120 and the output assembly, used to transmit power between the motor 120 and the output assembly. The output assembly can directly output power to the workpiece to be worked; the output assembly can also be connected to a tool attachment 111, which drives the workpiece, thereby realizing the tool function of the torque output tool 100. In this embodiment, the output assembly includes an output shaft 130 and a working attachment 111 connected to the output shaft 130. The working attachment 111 can be a clamping device. The output shaft 130 can rotate relative to the housing 110 about a first axis 101. The clamping device is mounted on the output shaft 130 and can rotate synchronously with the output shaft 130 to output power. For an electric screwdriver, the clamping device can clamp a screwdriver bit.

[0032] Reference Figures 3a to 5 The transmission assembly 200 includes a locking ring 220, a locking pin 230, and a drive wheel 210. The drive wheel 210 is mounted on the output shaft 130 and rotates synchronously with the output shaft 130. The output shaft 130 has a transmission part that mates with the drive hole 213, specifically an external hexagonal portion. The locking ring 220 is fixedly disposed within the housing 110 and cannot rotate relative to the housing 110. The locking ring 220 is mounted around the output shaft 130, forming an accommodating space between the locking ring 220 and the output shaft 130. The locking pin 230 is located within the accommodating space formed between the locking ring 220 and the output shaft 130.

[0033] The drive wheel 210 also includes a wheel body, which is generally disc-shaped. A lever 211 is formed on the side of the wheel body near the locking pin 230, and the lever 211 is located within the accommodating space between the shaft locking ring 220 and the output shaft 130. The wheel body of the drive wheel 210 also forms a drive hole 213, into which the transmission part of the output shaft 130 extends. In this embodiment, the transmission part of the output shaft 130 is an external hexagonal portion, and the corresponding drive hole 213 is an octagonal hole that allows the transmission part to rotate within the drive hole 213 relative to the drive wheel 210 within a preset angle range. Of course, the specific structure of the drive hole 213 is not limited to this; as long as the structure of the drive hole 213 allows the transmission part to rotate within the drive hole 213 relative to the drive wheel 210 within a preset angle range, it falls within the scope of protection of this invention. The transmission part of the output shaft 130 is also not limited to an external hexagonal portion; the transmission part of the output shaft 130 can also be other transmission structures.

[0034] The locking pin relative to the shaft locking ring 220 has at least a locked position and an unlocked position. When the locking pin is in the locked position, the locking pin locks the rotation of the output shaft 130 relative to the housing 110. When the locking pin is in the unlocked position, the locking pin releases the rotation of the output shaft 130. The toggle block 211 is used to toggle to switch the locking pin between the locked position and the unlocked position.

[0035] The shaft locking ring 220 has an inner wall surface centered on the first axis 101, which forms the aforementioned accommodating space around the output shaft 130. The outer periphery of the output shaft 130 includes a first surface and a second surface, wherein the first surface is parallel to the first axis 101, and the second surface is centered on the first axis 101. The locking pin 230 is a cylindrical pin disposed between the first surface and the inner wall surface. In this embodiment, to improve stability, the number of first surfaces is 3, and the number of second surfaces is also 3, with the first and second surfaces spaced apart sequentially in the circumferential direction around the first axis 101. Correspondingly, the number of locking pins is also 3, and the number of toggle blocks 211 is also 3, with the three toggle blocks 211 respectively located between two adjacent locking pins to push the locking pins to move in the circumferential direction around the first axis 101. (Refer to...) Figure 3b When the locking pin 230 is in the unlocked position, it is not in contact with both the inner wall and the first surface simultaneously. In this case, the drive wheel 210 can drive the output shaft 130 to rotate relative to the housing 110 in the first direction. (Refer to...) Figure 3c When the locking pin 230 is in the locked position, the locking pin 230 can contact the inner wall surface and the first surface at the same time. At this time, the position of the locking pin 230 in the circumferential direction around the first axis 101 is locked. At this time, the rotation of the output shaft 130 relative to the housing 110 is locked. Thus, the user cannot rotate the output shaft 130 mechanism relative to the housing 110 from the side where the output component is located. Thus, the user can disassemble the clamping device.

[0036] The torque output tool 100 also includes a separator 240 disposed between the drive wheel 210 and the locking ring 220. The separator 240 serves to isolate the locking pin 230 from the drive wheel 210, and simultaneously isolates the drive wheel 210 from the locking ring 220. The drive wheel 210 includes a third surface with a lever 211, and the separator 240 is positioned to contact the third surface. Due to the low hardness of the drive wheel 210, if the drive wheel 210 and the locking ring 220 are in direct contact without the separator 240, the friction generated by the relative movement between the drive wheel 210 and the locking ring 220 will cause wear on the end face of the drive wheel 210.

[0037] The separator 240 includes a main body 241 and an extension 242. The main body 241 is an annular gasket with a through hole 243 in the center. The extension 242 extends into the through hole 243 in the center of the annular gasket. The number of extensions 242 is the same as the number of locking pins 230, and the extensions 242 can contact the locking pins 230. The separator 240 is disposed in contact with the third surface of the drive wheel 210 having a lever 211. At the same time, the other side of the opposite third surface of the separator 240 abuts against the locking pin 230, specifically through the extensions 242. The extensions 242 are disposed between the levers 211, such that the levers 211 and the extensions 242 are spaced apart, forming an opening 244 between adjacent extensions 242, into which the levers 211 are inserted. The shape of the through hole 243 matches the drive hole 213, allowing the output shaft 130 to pass through the through hole 243.

[0038] Because the drive wheel 210 has a lever 211 on its third surface, and due to manufacturing processes and strength requirements, this third surface often has grooves, making it uneven. Without the separator 240, the locking pin 230 directly abuts against the third surface. When the locking pin 230 is switched to the locked and unlocked positions, it is moved relative to the third surface by the lever 211. The unevenness of the third surface affects the movement of the locking pin 230, making it prone to tilting relative to the drive wheel 210. This prevents the locking pin 230 from being accurately pushed to the corresponding locked and unlocked positions, thus affecting the performance of the torque output tool 100. Therefore, in this embodiment, the separator 240 has a flat surface, and is a flat-end pad, ensuring a flat surface for clamping the locking pin 230, thereby improving the stability of the torque output device's transmission mechanism.

[0039] Reference Figure 6 The transmission assembly 200 also includes a planetary gear train for speed reduction, while the torque output tool 100 also includes a gearbox 250, which includes a first gearbox 251 and a second gearbox 252. At least a portion of the planetary gear train is disposed in the first gearbox 251, and the shaft locking ring 220, drive wheel 210, and locking pin 230 are disposed in the second gearbox 252. The number of planetary gear trains can be single or multiple. The following describes the specific structure of this embodiment using a three-stage planetary gear train as an example.

[0040] Reference Figure 6 and Figure 7The transmission assembly 200 includes a first planetary gear set 260, a second planetary gear set 270, and a third planetary gear set 290. The first planetary gear set 260 includes a first planetary gear 261 and a first planetary carrier 262. The second planetary gear set 270 includes a second planetary gear 271 and a second planetary carrier 272. The transmission assembly 200 includes a sun gear, which is connected to and driven to rotate by a motor 120. The first planetary gear 261 is engaged with the sun gear. The third planetary gear set 290 includes a third planetary gear 291, a drive wheel 210, and a third-stage internal gear ring 292. The drive wheel 210 is used to mount the third planetary gear 291 and is engaged with the output shaft 130. The third-stage internal gear ring 292 and the third planetary gear 291 are engaged. The second planetary gear set 270 is located between the first planetary gear set 260 and the third planetary gear set 290.

[0041] The first gearbox 251 includes a front end and a rear end. The gearbox 250 is located at one end of the motor 120, and the rear end of the first gearbox 251 supports the rotor shaft 121 of the motor 120. The front end of the first gearbox 251 is open and communicates with the interior of the second gearbox 252.

[0042] Reference Figures 6 to 9 The transmission assembly 200 also includes a first-stage internal gear ring 263, which is disposed within the housing 110 assembly. The first-stage internal gear ring 263 meshes with first planetary gears 261. Multiple first planetary gears 261 are provided, and each of the multiple first planetary gears 261 meshes with a sun gear. The motor 120 drives the first planetary gears 261 to rotate via the sun gear. The sun gear and the first planetary gears 261 form meshing teeth for power transmission. The addendum circle diameter of the sun gear is set smaller than the addendum circle diameter of the first planetary gears 261, such that the number of meshing teeth on the first planetary gears 261 is greater than the number of meshing teeth on the sun gear.

[0043] The first planetary gear carrier 262 includes a transmission disk, a support frame, and a first output portion 266. The support frame and the first output portion 266 are respectively formed on both sides of the transmission disk. The support frame is inserted into the first planetary gear 261 and forms a rotatable connection with the first planetary gear 261, so that the first planetary gear 261 can drive the first planetary gear carrier 262 to rotate around the first axis 101 during operation. Both the transmission disk and the first output portion 266 have meshing teeth formed on their peripheral sides. The first output portion 266 is used to mesh with the second planetary gear set 270, thereby realizing the transmission connection between the first planetary gear set 260 and the second planetary gear set 270.

[0044] Multiple second planetary gears 271 are provided and externally mesh with the first output section 266, meaning the first output section 266 of the first planetary gear set 260 constitutes the sun gear of the second planetary gears 271. The transmission assembly 200 also includes a second-stage internal gear ring 273, with internal teeth formed on its inner circumference. The second-stage internal gear ring 273 and the second planetary gears 271 are meshed together. The second planetary gears 271 and the second planetary gear carrier 272 are rotatably connected. The second planetary gear carrier 272 forms a second output section connected to the output shaft 130. The output shaft 130 includes a flat portion 264 that mates with the second output section. A portion of the output shaft 130 is inserted between the second output sections, thereby achieving synchronous rotation of the output shaft 130 and the second output section.

[0045] The second-stage internal gear ring 273 meshes with the second planetary gear 271. The second-stage internal gear ring 273 includes multiple first locking teeth 274. The transmission assembly also includes a switching element, which includes second locking teeth that engage with the first locking teeth 274. The switching element can move to at least a first position and a second position. When the switching element is in the first position, the second locking teeth and the second internal gear ring are staggered in the circumferential direction of the first axis 101. When the switching element is in the second position, the second locking teeth and the first locking teeth 274 are disengaged in the circumferential direction of the first axis 101. When the switching element is in the first position, the second locking teeth restrict the rotation of the second-stage internal gear ring 273 by abutting against the first locking teeth 274. That is, the second-stage internal gear ring 273 cannot rotate relative to the first gearbox 251 around the first axis 101 at this time. At this time, the second-stage planetary gear set plays a deceleration role, and the transmission assembly 200 outputs a first transmission ratio overall. When the switching component is moved to the second position, the second locking tooth and the first locking tooth 274 no longer abut, so the second-stage internal gear ring 273 can rotate relative to the first gearbox 251, so the second-stage internal gear ring 273 and the second planetary gear 271 rotate synchronously. The second-stage planetary gear set does not have a speed reduction effect. At this time, the transmission assembly 200 outputs a second transmission ratio, and the first transmission ratio is greater than the second transmission ratio.

[0046] The switching element can be a ring with a second locking tooth. The switching element forms a mating part that engages with the first gearbox 251, thereby limiting the rotation of the switching element relative to the housing 110 by engaging with the mating part of the switching element. The first gearbox 251 of the switching element is fixed and the switching element can be moved relative to the first gearbox 251 to a first position and a second position.

[0047] The torque output tool 100 also includes a positioning element 280, supported by the first gearbox 251, which positions the first-stage internal gear ring 263 along the direction of the first axis 101. The positioning pin 281 extends along the direction of the first axis 101, meaning it extends along the axial direction of the first axis 101 or parallel to the axial direction of the first axis. By using the positioning element 280 in conjunction with the first gearbox 251 to position the first axis 101, the first gearbox 251 does not need to position the first-stage internal gear ring 263 separately, thus allowing the front end of the first gearbox 251 to be open, thereby reducing the size of the first gearbox 251.

[0048] The gearbox 250 also forms a mounting groove 253 that extends along the axial direction of the first axis 101. The first-stage internal gear ring 263 also includes a protrusion that can be inserted into the mounting groove 253 to limit the first-stage internal gear ring 263. At this time, the first-stage internal gear ring 263 is not rotatable relative to the first gearbox 251.

[0049] Optionally, the positioning element 280 is a positioning pin 281, which extends along the axial direction of the first axis 101. The positioning pin 281 is disposed within the mounting groove 253 formed by the first gearbox 251, and the transmission assembly 200 also includes a washer. One end of the positioning pin 281 abuts against the washer, and the other end of the positioning pin 281 abuts against the first-stage internal gear ring 263, thereby clamping the first-stage internal gear ring 263 through the positioning pin 281 and the first gearbox 251. The positioning pin 281 abuts against the protrusion 265. The positioning pin 281 extends along the axial direction of the first axis 101, which can prevent the increase of the diameter of the first gearbox 251 in the radial direction along the first axis 101, so that the diameter of the gearbox 250 at the first-stage internal gear ring 263 is less than or equal to 46 mm and greater than or equal to 40 mm. Meanwhile, because the structure of the first gearbox 251 is simplified, the dimension of the gearbox 250 in the axial direction of the first axis 101 is greater than or equal to 43 mm and less than or equal to 55 mm.

[0050] In one implementation, reference Figure 8 and Figure 9 The positioning element is a positioning pin 281a, which extends radially along the first axis. The first gearbox 251a forms a mounting groove 253a, and the positioning pin 281a is placed within the mounting groove 253a, thus positioning the first-stage internal gear ring 263a. The first-stage internal gear ring 263a forms a flat portion 264a, and the positioning pin 281a is located between the mounting groove 253a and the flat portion 264a. The positioning pin 281a contacts the flat portion 264a of the first-stage internal gear ring 263a. The first-stage internal gear ring 263a also includes a protrusion that can be inserted into the mounting groove 253a to limit the positioning of the first-stage internal gear ring 263a, and the positioning pin 281a simultaneously abuts against the protrusion.

[0051] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A torque output tool, comprising: The output shaft is used to output torque. An electric motor, including a rotor shaft that rotates about a first axis; A transmission assembly for transmitting the output of the motor to the output shaft; Gearbox, for housing the transmission assembly; The transmission assembly includes: The first planetary gear set includes: a first planetary gear, a first planetary gear carrier, and a first-stage internal gear ring. The first planetary gear is driven by the motor. The first planetary gear carrier is used to mount the first planetary gear. The first-stage internal gear ring meshes with the first planetary gear. The second planetary gear set includes: The second planetary gear and the second planetary gear carrier are used to mount the second planetary gear; Its features are: The gearbox is located at one end of the motor and supports the rotor shaft; The torque output tool also includes: The positioning element is supported by the gearbox and positions the first-stage internal gear ring in the direction of the first axis. The positioning element is a positioning pin, which extends along the direction of the first axis.

2. The torque output tool as described in claim 1, characterized in that: The second planetary gear set also includes a second-stage internal gear ring, and the locating pin is disposed in the circumferential direction of the second-stage internal gear ring.

3. The torque output tool as described in claim 1, characterized in that: The diameter of the gearbox at the first-stage internal gear ring is less than or equal to 46 mm and greater than or equal to 40 mm.

4. The torque output tool as described in claim 1, characterized in that: The gearbox also forms a mounting groove that extends along a first axis, and the first-stage internal gear ring further includes a protrusion that can be inserted into the mounting groove to limit the first-stage internal gear ring.

5. The torque output tool as described in claim 4, characterized in that: The positioning element abuts against the protrusion.

6. The torque output tool as described in claim 1, characterized in that: The transmission assembly further includes a third planetary gear set, which includes a third planetary gear, a drive wheel, and a third-stage internal gear ring. The drive wheel is used to mount the third planetary gear, and the third-stage internal gear ring meshes with the third planetary gear. The second planetary gear set is disposed between the first planetary gear set and the third planetary gear set.

7. The torque output tool as described in claim 1, characterized in that: The gearbox has a dimension in the axial direction of the first axis that is greater than or equal to 43 mm and less than or equal to 55 mm.

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