Multi-functional impact drill

Abstract

The application provides a multifunctional percussion drill, which comprises a motor, a housing assembly for supporting the motor, an output shaft capable of being driven to rotate around a first axis by the motor, and a transmission assembly comprising a locking ring capable of rotating relative to the housing assembly. The multifunctional percussion drill further comprises a skip pin connected with the locking ring, a biasing element connected with the skip pin, the biasing element providing a biasing force for pressing the skip pin against the locking ring, a function conversion piece comprising a stop portion for limiting the movement of the skip pin in the direction of the first axis and a release portion for allowing the movement of the skip pin along the first axis, and an operating piece connected with the function conversion piece, the operating piece being capable of driving the function conversion piece to rotate around the first axis so as to switch the limiting state of the movement of the skip pin in the direction of the first axis. The multifunctional percussion drill provided by the application has a compact structure and reliable functions.

Description

Technical Field

[0001] This invention relates to a power tool, and more specifically to a multi-functional impact drill. Background Technology

[0002] Multi-functional impact drills are used to provide torque assistance for users' daily operations. They have a torque adjustment device to adjust the output torque of the multi-functional impact drill. The torque adjustment device in existing products has a complex structure and a large size, which is not conducive to the size reduction of multi-functional impact drills. Moreover, the existing torque adjustment structure is relatively unreliable and is prone to torque adjustment malfunction. Summary of the Invention

[0003] The main objective of this invention is to provide a multi-functional impact drill that is compact in structure and reliable in function.

[0004] This invention provides a multi-functional impact drill, comprising: a motor; a housing assembly for supporting the motor; an output shaft capable of being driven by the motor to rotate about a first axis; a transmission assembly including a locking ring rotatable relative to the housing assembly; the multi-functional impact drill further comprising: a stop pin connected to the locking ring; a biasing element connected to the stop pin, the biasing element providing a biasing force that causes the stop pin to press against the locking ring; a function conversion component including a stop portion restricting movement of the stop pin in the direction of the first axis and a release portion allowing movement of the stop pin along the first axis; and an operating component connected to the function conversion component, the operating component capable of driving the function conversion component to rotate about the first axis to switch the restriction state on the movement of the stop pin in the direction of the first axis.

[0005] Optionally, the transmission assembly includes a planetary gear set and a gearbox. The planetary gear set includes planetary gears, a sun gear, and a planetary gear carrier. The planetary gear carrier is used to mount the planetary gears. The planetary gears mesh with the sun gear. The locking ring includes meshing teeth that mesh with the planetary gears and locking teeth that abut against the shift pin.

[0006] Optionally, the function conversion element is an annular gasket, with an opening formed in the middle of the annular gasket for the skip pin to pass through, and the stop portion protruding relative to the release portion toward the center of the opening.

[0007] Optionally, the front end of the shift pin forms a first step and a second step, the first step being able to abut against the stop, and the second step being located at the side end of the function conversion member.

[0008] Optionally, the function conversion element is a shim, with an opening formed in the middle of the shim for the skip pin to pass through, and the stop portion protruding relative to the release portion toward the center of the opening.

[0009] Optionally, the transmission assembly includes a planetary gear set and a gearbox, the gearbox including a limiting structure for the positioning function conversion element.

[0010] Optionally, the impact assembly includes: a fixed impact mechanism, at least a portion of which is fixedly connected to the housing assembly; a movable impact mechanism, which is movable along the first axis with the output shaft; an operating member connected to the movable impact mechanism, the operating member having a first state that allows the movable impact mechanism to move in the axial direction of the first axis, and a second state that restricts the movable impact mechanism from moving in the axial direction of the first axis.

[0011] Optionally, the moving impact mechanism forms a support leg, and the fixed impact mechanism has a mating part. The moving impact mechanism can be driven by the operating element to rotate around the first axis, so that the mating part and the support leg are aligned or staggered in the axial direction of the first axis.

[0012] Optionally, the mating part is a boss or groove formed on the fixed impact mechanism.

[0013] Optionally, the impact assembly also includes a bushing fitted onto the outside of the moving impact mechanism, the moving impact mechanism forming a support leg, the moving impact mechanism being driven by an operating element to rotate around a first axis, and the bushing forming a groove that mates with the support leg. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the multifunctional impact drill according to the first embodiment of the present invention.

[0015] Figure 2 for Figure 1 The diagram shows the structure of the transmission and impact components of the multi-functional impact drill.

[0016] Figure 3 for Figure 1 Cross-sectional views of the transmission and impact components of the multi-functional impact drill.

[0017] Figure 4 for Figure 1 An exploded view of the transmission components of a multi-functional impact drill.

[0018] Figure 5 for Figure 1 A schematic diagram of the functional conversion component of the multi-functional impact drill.

[0019] Figure 6 for Figure 1 A schematic diagram of the structure of the multi-functional impact drill when the function conversion component is in the first position.

[0020] Figure 7 for Figure 1 A schematic diagram of the structure of the multi-functional impact drill when the function conversion component is in the second position.

[0021] Figure 8 for Figure 1A schematic diagram of the impact assembly when the operating parts of the multi-functional impact drill are in the first state.

[0022] Figure 9 for Figure 1 A schematic diagram of the impact assembly when the operating parts of the multi-functional impact drill are in the second state.

[0023] Figure 10 for Figure 1 An exploded view of the impact component of a multi-functional impact drill.

[0024] Figure 11 This is a schematic diagram of the internal structure of the multifunctional impact drill according to the second embodiment of the present invention.

[0025] Figure 12 This is a schematic diagram of the internal structure of the multifunctional impact drill according to the second embodiment of the present invention from another angle. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 The present invention provides a multi-functional impact drill 100, which can at least provide torque-assisted screw driving into workpieces and can provide impact force operation. The impact function of the multi-functional impact drill 100 can be operated to be turned on or off, so that the multi-functional impact drill 100 can be switched to screw mode, hammer mode and drill mode to meet different user needs.

[0028] Reference Figure 2 and Figure 3 The multi-functional impact drill 100 includes a motor, a housing assembly 120, an output shaft 110, and an impact assembly 200. The motor is housed within the housing assembly 120 and supported by the housing assembly 120. The motor drives the output shaft 110 to rotate around a first axis 101. A working head is located at the end of the output shaft 110, allowing the output shaft 110 to rotate a workpiece to achieve the function of a screwdriver. The impact assembly 200 drives the output shaft 110 to perform an impact action along the first axis 101, thus enabling the multi-functional impact drill 100 to function as an impact wrench. An operating element 330 is connected to the impact assembly 200, allowing the impact function of the multi-functional impact drill 100 to be turned on and off.

[0029] The motor has a motor shaft that rotates along a first axis 101. The multi-functional impact drill 100 also includes a transmission assembly that connects the motor shaft and the output shaft 110. The motor drives the output shaft 110 to rotate through the transmission assembly.

[0030] Reference Figure 3 , Figure 4The housing assembly 120 includes a gearbox 121, a front housing 122, and a main housing 123. A transmission assembly is disposed within the gearbox 121. An impact assembly 200 is disposed within the front housing 122. The main housing 123 supports the gearbox 121, the front housing 122, and the motor.

[0031] The 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 a motor and driven to rotate by the motor. The first planetary gear 261 is configured to mesh with the sun gear. The third planetary gear set 290 includes a third planetary gear, a drive gear, and a third-stage internal gear ring. The drive gear is used to mount the third planetary gear and meshes with the output shaft 110. The third-stage internal gear ring meshes with the third planetary gear. The second planetary gear set 270 is located between the first planetary gear set 260 and the third planetary gear set 290.

[0032] The transmission assembly 200 also includes a first-stage internal gear ring 263, which is disposed within the housing 110 assembly and meshes with first planetary gears 261. Multiple first planetary gears 261 are provided, and each of these gears meshes with a sun gear. The motor drives the first planetary gears 261 to rotate via the sun gear. The sun gear and the first planetary gears 261 form meshing teeth 2731 for power transmission. The addendum circle diameter of the sun gear is set smaller than that of the first planetary gears 261, such that the number of teeth in the meshing teeth 2731 of the first planetary gears 261 is greater than the number of teeth in the meshing teeth 2731 of the sun gear.

[0033] The first planetary gear carrier 262 includes a transmission disk, a support frame, and a first output section. The support frame and the first output section are 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 section have meshing teeth 2731 formed on their peripheral sides. The first output section 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.

[0034] Multiple second planetary gears 271 are provided and mesh externally with the first output section, meaning the first output section 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 110. The output shaft 110 includes a flat portion that mates with the second output section. A portion of the output shaft 110 is inserted between the second output sections, thereby achieving synchronous rotation of the output shaft 110 and the second output section.

[0035] The second-stage internal gear ring 273 meshes with the second planetary gear 271. The second-stage internal gear ring 273 includes multiple first meshing teeth 2731. The transmission assembly also includes a switching element, which includes second meshing teeth 2731 that engage with the first meshing teeth 2731. The switching element can move to at least a first gear shift position and a second gear shift position. When the switching element is in the first gear shift position, the second meshing teeth 2731 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 gear shift position, the second meshing teeth 2731 and the first meshing teeth 2731 are disengaged in the circumferential direction of the first axis 101. When the switching element is in the first gear shift position, the second meshing teeth 2731 restrict the rotation of the second-stage internal gear ring 273 by abutting against the first meshing teeth 2731. That is, the second-stage internal gear ring 273 cannot rotate relative to the gearbox 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 gear shift position, the second meshing tooth 2731 and the first meshing tooth 2731 no longer abut, so the second-stage internal gear ring 273 can rotate relative to the gearbox, and 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.

[0036] The third planetary gear set 290 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 drive wheel meshes with the output shaft 110. The third-stage internal gear ring meshes with the third planetary gear. The second planetary gear set 270 is disposed between the first planetary gear set 260 and the third planetary gear set 290.

[0037] Reference Figure 5 and Figure 10The multi-functional impact drill 100 also includes: a shift pin 310 and a biasing member 320, with the shift pin 310 connected to a locking ring. The second-stage internal gear ring 273 is the locking ring, which includes meshing teeth 2731 that mesh with the planetary gears, as well as locking teeth 2732 that abut against the shift pin 310. The biasing member 320 is connected to the shift pin 310 and provides a biasing force that causes the shift pin 310 to press against the locking ring. The multi-functional impact drill 100 also includes a function conversion member 340, which includes a stop portion 341 that restricts the movement of the shift pin 310 in the direction of the first axis 101, and a release portion 342 that allows the shift pin 310 to move along the first axis 101. An operating member 330 is connected to the function conversion member 340, and the operating member 330 can drive the function conversion member 340 to rotate around the first axis 101 to switch the restriction state on the movement of the shift pin 310 in the direction of the first axis 101. The gearbox 121 includes a limiting structure for a positioning function conversion member 340, which is limited by the axial direction of the first axis of the gearbox.

[0038] The function conversion element 340 is a shim with an opening 343 in its center for the skip pin 310 to pass through. The stop portion 341 protrudes towards the center of the opening 343 relative to the release portion 342. The function conversion element 340 is a shim with an opening 343 in its center for the skip pin 310 to pass through. The stop portion 341 protrudes towards the center of the opening 343 relative to the release portion 342. The function conversion element 340 can rotate relative to the housing assembly 120 about the first axis 101, such that the stop portion 341 and the release portion 342 are respectively aligned with or staggered with the skip pin 310 along the axial direction of the first axis 101. When the stop portion 341 and the shift pin 310 are aligned in the axial direction of the first axis 101, the stop portion 341 of the function conversion member 340 abuts against the shift pin 310. At this time, the shift pin 310 cannot compress the biasing member 320 along the axial direction of the first axis 101. The biasing member 320 is a compressible elastic member. When the release portion 342 and the shift pin 310 are aligned in the axial direction of the first axis 101, the shift pin 310 can pass through the release portion 342. At this time, the shift pin 310 can compress the biasing member 320 along the axial direction of the first axis 101. The function conversion member 340 has a simple structure, which can reduce the overall size of the gearbox 121.

[0039] The second-stage internal gear ring 273 is a locking ring. Besides the meshing teeth 2731 that engage with the planetary gears, the locking ring also includes locking teeth 2732 that abut against the shift pin 310. When the multi-functional impact drill 100 is switched to screw mode, the user adjusts the compression of the biasing element 320 to regulate the biasing force provided by the biasing element 320 to the shift pin 310. The shift pin 310 is subjected to both the rotational torque of the second-stage internal gear ring and the pressure of the locking teeth 2732. If the pressure of the locking teeth 2732 on the shift pin 310 does not exceed the biasing force of the biasing element 320, then the shift pin 310 will cause the second-stage internal gear ring to stop rotating. At this point, the planetary gear carrier can output power through the output shaft 110. If the pressure of the locking tooth 2732 on the shift pin 310 exceeds the biasing force of the biasing element 320, the shift pin 310 will move axially and pass the locking tooth 2732. At this point, the planetary gear carrier will not be able to output power through the output shaft 110. By adjusting the biasing force of the biasing element 320, the torque output of the tool can be adjusted. When the multi-functional impact drill 100 is switched to drill or hammer mode, the shift pin 310 is locked by the function switching element, thereby allowing the multi-functional impact drill 100 to output maximum torque.

[0040] Reference Figure 8 , Figure 9 as well as Figure 10 The impact mechanism 400 includes a fixed impact mechanism 410 and a moving impact mechanism 420. The fixed impact mechanism 410 is fixedly connected to the housing assembly 120 and is sleeved on the output shaft 110, which limits the output shaft 110 in the radial direction of the first axis 101. The moving impact mechanism 420 can move along the first axis 101 with the output shaft 110. The operating member 330 is connected to the moving impact mechanism 420 and has a first state that allows the moving impact mechanism 420 to move in the axial direction of the first axis 101, and a second state that restricts the moving impact mechanism 420 from moving in the axial direction of the first axis 101, so as to realize the impact function of the multi-functional impact drill 100 on or off. The user can realize the impact function of the multi-functional impact drill 100 by rotating the operating member 330 around the first axis 101.

[0041] The fixed impact mechanism 410 includes a fixed impact tooth 411, which is connected to the housing assembly 120. The movable impact mechanism 420 includes a movable impact tooth 421, which is movable along the output shaft 110 on the first axis 101. The fixed impact tooth 411 and the output shaft 110 are in a small clearance fit, and the output shaft 110 is capable of rotating relative to the fixed impact tooth 411 about the first axis 101 and reciprocating along the axial direction of the first axis 101.

[0042] The impact mechanism also includes a support leg 430. Optionally, the moving impact mechanism 420 forms the support leg 430, and the fixed impact mechanism 410 forms a mating portion 440. The moving impact mechanism 420 can be rotated around the first axis 101 by the operating member 330, so that the mating portion 440 and the support leg 430 are aligned or staggered in the axial direction of the first axis 101. The mating portion 440 is a boss or groove formed on the fixed impact mechanism 410.

[0043] When the stop part 341 abuts against the jump stop pin 310, the multi-functional impact drill 100 is switched to hammer mode or drill mode. When the jump stop pin 310 is aligned with the release part 342 in the direction of the first axis 101, the multi-functional impact drill 100 is switched to screw mode. When the operating member 330 drives the function conversion member 340 to rotate to the first position, the operating member 330 can be switched to the first state or the second state, so that the multi-functional impact drill 100 is switched to hammer mode or drill mode respectively. When the operating member 330 drives the function conversion member 340 to rotate to the second position, the operating member 330 can be switched to the second state, so that the multi-functional impact drill 100 is switched to screw mode. Thus, by rotating the operating member 330, the user can adjust the function of the multi-functional impact drill 100, successively adjusting the multi-functional impact drill 100 to drill mode, screw mode, or hammer mode.

[0044] When the operating component 330 drives the function conversion component 340 to rotate to the first position, the operating component 330 can be switched to the first state, and the multi-functional impact drill 100 switches to the hammer mode. At this time, the function conversion component 340 drives the function conversion component 340 to rotate, and the support leg 430 rotates, so that the stop part 341 and the jump pin 310 abut against each other, and the grooves of the support leg 430 and the mating part 440 are aligned, or the protrusions of the support leg 430 and the mating part 440 are misaligned, so that the dynamic impact mechanism 420 can move relative to the housing assembly 120 along the axial direction of the first axis 101, so that the output shaft 110 can move in the direction of the first axis 101. When the operating component 330 is rotated, it can drive the function conversion component 340 to rotate to the first position, and the operating component 330 can be switched to the second state, and the multi-functional impact drill 100 switches to the drill position. At this time, the function conversion component 340 drives the function conversion component 340 to rotate, and the support leg 430 rotates, so that the stop part 341 and the jump pin 310 abut against each other, and the grooves of the support leg 430 and the mating part 440 are misaligned, or the support leg 430 and the boss of the mating part 440 abut against each other, so that the multi-functional impact drill 100 rotates with maximum torque output without producing impact motion. When the operating component 330 is rotated, it can drive the function conversion component 340 to rotate to the second position. At this time, the operating component 330 can be switched to the second state, and the multi-functional impact drill 100 is switched to the screw position. At this time, the function conversion component 340 rotates, and the support leg 430 rotates, so that the stop part 341 and the jump pin 310 are misaligned. The jump pin 310 can pass through the release part 342, and the grooves of the support leg 430 and the mating part 440 are misaligned, or the bosses of the support leg 430 and the mating part 440 are aligned, so that the output shaft 110 does not perform impact movement, and the multi-functional impact drill 100 has the function of adjusting torque.

[0045] Optional, refer to Figure 10 The impact assembly 200 also includes a bushing 450, which is sleeved on the outside of the moving impact mechanism 420. The moving impact mechanism 420 forms a support leg 430. The moving impact mechanism 420 can be driven by the operating member 330 to rotate around the first axis 101. The bushing 450 forms a mating part that cooperates with the support leg 430, such as a groove or a boss.

[0046] In one embodiment of the present invention, a multi-functional impact drill is provided, with reference to... Figure 11 and Figure 12The multi-functional impact drill includes multiple shift pins 310a, an annular washer 360a, and a biasing member 320a. The shift pins 310a are connected to a locking ring to restrict its rotation. The annular washer 360a is fixedly connected to the multiple shift pins 310a. The biasing member 320a connects to the annular washer 360a and provides a biasing force that causes the shift pins 310a to press against the locking ring. The multi-functional impact drill also includes a function conversion member 340a, which can be rotated to a first position and a second position. When the function conversion member 340a is in the first position, the movement of the shift pins 310a relative to the housing assembly 120a in a first axial direction is restricted. When the function conversion member 340a is in the second position, the shift pins 310a can move relative to the housing assembly 120a along the first axial direction. The annular washer 360a reduces errors that occur when adjusting the function conversion member 340a. Optionally, the biasing element 320a may be a plurality of small springs connected to the annular washer 360a, or it may be a large spring connected to the annular washer 360a. Optionally, the front end of the stop pin 310a forms a first step portion 311a and a second step portion 312a, the first step portion 311a being able to abut against the stop portion, and the second step portion 312a being located at the side end of the function conversion element 340a.

[0047] 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 multi-functional impact drill, comprising: motor, Housing assembly for supporting the motor; The output shaft can be driven by the motor to rotate around the first axis; The transmission assembly includes a gearbox and a locking ring that can rotate relative to the housing assembly; The multi-functional impact drill is characterized in that it further includes: The jump pin is connected to the locking ring; A biasing element, connected to the stop pin, provides a biasing force that causes the stop pin to press against the locking ring; A function conversion element includes a stop portion that restricts the movement of the shift pin in a first axial direction, and a release portion that allows the shift pin to move along the first axial direction; the function conversion element is limited by the gearbox in the axial direction of the first axial direction; wherein, an opening is formed in the middle of the function conversion element for the shift pin to pass through, and the stop portion protrudes toward the center of the opening relative to the release portion; when the stop portion abuts against the shift pin, the multi-functional impact drill is switched to hammer mode or drill mode, and when the shift pin is aligned with the release portion in the direction of the first axial direction, the multi-functional impact drill is switched to screw mode; An operating element is connected to the function conversion element, and the operating element can drive the function conversion element to rotate around the first axis to switch the restriction state on the movement of the jump pin in the direction of the first axis.

2. The multi-functional impact drill according to claim 1, characterized in that, The transmission assembly includes a planetary gear set and a gearbox. The planetary gear set includes planetary gears, a sun gear, and a planetary gear carrier. The planetary gear carrier is used to mount the planetary gears. The planetary gears mesh with the sun gear. The locking ring includes meshing teeth that mesh with the planetary gears and locking teeth that abut against the shift pin.

3. The multi-functional impact drill according to claim 2, characterized in that, The function conversion component is an annular gasket, with an opening formed in the middle of the annular gasket for the skip pin to pass through, and the stop portion protruding relative to the release portion toward the center of the opening.

4. The multi-functional impact drill according to claim 1, characterized in that, The front end of the shift pin forms a first step and a second step. The first step can abut against the stop, and the second step is located at the side end of the function conversion member.

5. The multi-functional impact drill according to claim 1, characterized in that: The function conversion component is a gasket, and an opening is formed in the middle of the gasket for the skip pin to pass through. The stop portion protrudes toward the center of the opening relative to the release portion.

6. The multi-functional impact drill according to claim 5, characterized in that: The transmission assembly includes a planetary gear set, and the gearbox includes a limiting structure for positioning the functional conversion element.

7. The multi-functional impact drill according to claim 1, characterized in that, include: Impact assembly, the impact assembly comprising: A fixed impact mechanism, at least a portion of which is fixedly connected to the housing assembly. A dynamic impact mechanism is provided, which can move along the first axis with the output shaft. An operating member is connected to the dynamic impact mechanism and has a first state that allows the dynamic impact mechanism to move in the axial direction of the first axis and a second state that restricts the dynamic impact mechanism from moving in the axial direction of the first axis.

8. The multi-functional impact drill according to claim 7, characterized in that: The dynamic impact mechanism forms a support leg, and the fixed impact mechanism has a mating part. The dynamic impact mechanism can be driven by the operating member to rotate around the first axis, so that the mating part and the support leg are aligned or staggered in the axial direction of the first axis.

9. The multi-functional impact drill according to claim 8, characterized in that: The mating part is a boss or groove formed on the fixed impact mechanism.

10. The multi-functional impact drill according to claim 7, characterized in that: The impact assembly also includes a bushing fitted onto the outside of the moving impact mechanism, the moving impact mechanism forming a support leg, the moving impact mechanism being driven by the operating member to rotate around the first axis, and the bushing forming a groove that mates with the support leg.

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