Power tool

Abstract

The application discloses an electric tool, which comprises a casing, a gear box accommodated in the casing, a transmission assembly arranged in the gear box, a sliding groove arranged on the outer wall of the gear box, a gear shifting device arranged on the transmission assembly and extending to the outside of the gear box through the sliding groove, and a blocking member arranged between the casing and the outer wall of the gear box and corresponding to the position of the sliding groove.

Description

Technical Field

[0001] This application relates to the field of power tools, and more particularly to power tools with sealing elements. Background Technology

[0002] Most common gun drill tools on the market, such as wrenches and drills, have speed adjustment functions. To achieve this, a groove is usually cut into the outer wall of the gearbox for the shift cable to enter the gearbox. The shift cable engages and disengages with the shift gear ring inside the gearbox to switch gears. As the gears are switched, the shift cable moves back and forth, causing grease inside the gearbox to overflow from the groove, which can affect the operation of the gears inside the gearbox. Therefore, an oil leakage prevention device needs to be installed on the outer wall of the gearbox. Currently, the oil leakage prevention device on the market is a sealing piece attached to the groove. Although the sealing piece can reduce grease leakage, it can also affect the movement of the shift cable. Summary of the Invention

[0003] One object of the present invention is to provide a power tool that can reduce grease leakage inside the gearbox and also achieve a limiting effect on the shift cable.

[0004] This invention provides an electric tool, comprising: a housing; a gearbox housed within the housing, the gearbox having a transmission assembly inside, and a groove formed on the outer wall of the gearbox; a shifting device acting on the transmission assembly and extending through the groove to the outside of the gearbox; the electric tool further comprising a sealing member disposed between the housing and the outer wall of the gearbox, and corresponding to the position of the groove; wherein the sealing member has a limiting portion on the side facing the groove for limiting the shifting device.

[0005] A further improvement is that the area of ​​the sealing component is not less than the area of ​​the groove.

[0006] A further improvement is that the number of limiting parts is two, which are respectively set at both ends of the slide groove.

[0007] A further improvement is that the limiting part is a groove.

[0008] A further improvement is that the sealing component further includes a fixing part, which is located between the two limiting parts, and the fixing part extends at least partially into the sliding groove.

[0009] A further improvement is that the sealing element is an elastic soft pad, and the soft pad is square.

[0010] A further improvement is that there is a gap between the housing and the outer wall of the gearbox, and the thickness of the sealing component is greater than or equal to the width of the gap.

[0011] A further improvement is as follows: the shifting device includes a shifting push torque, a shifting wire, and a shifting gear ring.

[0012] A further improvement is as follows: the middle part of the shift wire is connected to the shift push knob, and the middle part of the shift wire extends to either side with a pivot ring, a limiting leg and a connecting end. The shift gear ring is connected to the transmission assembly, and the shift gear ring moves back and forth to drive the transmission assembly to switch gears.

[0013] A further improvement is as follows: the shifting push torque drives the shifting wire to rotate and positions the limiting leg on either side of the limiting part to maintain the gear position of the transmission component.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: First, the sealing component is set at the position corresponding to the slide groove of the gearbox, which can reduce the leakage of grease inside the gearbox; Second, the inner wall of the sealing component is provided with a limiting part to limit the shifting device, thereby maintaining the gear position of the tool. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a power tool according to an embodiment of this application; Figure 2 This is a partial cross-sectional view of a power tool according to an embodiment of this application; Figure 3 This is an exploded view of a portion of the structure of a power tool according to an embodiment of this application; Figure 4 This is a schematic diagram of the gear shifting device of an electric tool according to an embodiment of this application. Figure 5 This is a schematic diagram of the structure of a sealing component of a power tool according to an embodiment of this application; Figure 6 It is based on Figure 5 A schematic diagram of the internal structure of the sealing component; Figure 7 yes Figure 4 A schematic diagram of the gear shifting device in first gear; Figure 8 yes Figure 4 A schematic diagram of the gear shifting device in second gear.

[0016] Meaning of the reference numerals in the diagram: Detailed Implementation

[0017] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0019] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0021] Reference Figures 1 to 7 In this embodiment, the power tool is preferably an impact drill. The impact drill includes a housing 1, which includes a left housing and a right housing that are fitted together. A torque adjustment component 2 and a mode switching component 3 are fitted at the front end of the housing 1. A gearbox 4, a shifting device 5, and an impact component 6 are housed in the middle of the housing 1. A grip portion 7 extends downward from the middle of the housing 1 for the user to hold the impact drill during operation. The grip portion 7 is equipped with a switch for the user to operate and control the start and stop of the impact drill. The lower end of the grip portion 7 can be used to connect a battery pack, which supplies power to the impact drill. A motor 8 is housed at the rear end of the housing 1.

[0022] Gearbox The gearbox 4 is housed within the housing 1 and includes a first gearbox housing 41, a second gearbox housing 42, and an output shaft 43 supporting the first and second gearbox housings 42. The output shaft 43 has a protrusion. The gearbox 4 has a transmission assembly 44 inside, which includes a planetary gear train mechanism. The outer wall of the gearbox 4 has a sliding groove 421.

[0023] Furthermore, the first gearbox housing 41 includes a base 411 and a cylindrical protrusion 412. The base 411 includes an end face, and the cylindrical protrusion 412 protrudes from the end face of the base 411. The cylindrical protrusion 412 has a through hole 4121 penetrating the base 411. The first gearbox housing 41 also includes a first limiting part 413 and a second limiting part 414 between the base 411 and the cylindrical protrusion 412.

[0024] Preferably, the first limiting part 413 is an annular groove and the second limiting part 414 is a vertical groove.

[0025] Furthermore, the seat 411 has a plurality of cylindrical holes 4111 that penetrate the end face and are distributed around the cylindrical protrusion 412. The cylindrical holes 4111 are used to set a pin, which can move within the cylindrical holes 4111.

[0026] Furthermore, the second gearbox housing 42 has a groove 421 extending from the outer surface to the inner surface on its side wall. The groove 421 is used for the shifting device 5 to extend into the gearbox 4 to switch gears.

[0027] Preferably, there are two slide grooves 421, which are symmetrically arranged on the side wall of the second gearbox housing 42, and the slide grooves 421 are arc-shaped. The arc-shaped slide grooves 421 can facilitate the smooth back-and-forth sliding of the shifting element.

[0028] Gear shifting device The shifting device 5 includes a shifting push knob 51, a shifting wire 52, and a shifting gear ring 53. The middle part of the shifting wire 52 is connected to the shifting push knob 51. The middle part of the shifting wire 52 extends to either side with a pivot ring 521, a limiting leg 522, and a connecting end 523. The shifting wire 52 is connected to the outer wall of the gearbox 4 through the pivot ring 521 and can be pushed by the shifting push knob 51 to rotate around the gearbox 4. The connecting end 523 of the shifting wire 52 extends into the slide groove 421 and is connected to the shifting gear ring 53. The shifting gear ring 53 is connected to the transmission assembly 44. The shifting gear ring 53 moves back and forth to drive the transmission assembly 44 to perform gear switching.

[0029] Furthermore, the shift wire 52 surrounds the second gearbox housing 42 in a partially circular manner and is oscillatingly supported on the second gearbox housing 42 by the arc-shaped groove 421.

[0030] Preferably, the shift wire 52 surrounds the second gearbox housing 42 in a semi-circular manner.

[0031] Furthermore, the shifting device 5 also includes a limiting ring 54, and the shifting push torque 51 moves back and forth to make the shifting wire 52 swing left and right to realize the engagement and disengagement of the shifting gear ring 53 and the limiting ring 54.

[0032] In this embodiment, the gear switching principle of the impact drill is as follows: when the user moves the shift push knob 51 backward, the limiting leg 522 of the shift wire 52 swings forward to drive the shift gear ring 53 to move forward and engage with the limiting ring 54. At this time, the speed ratio of the transmission component 44 increases, and the power tool outputs high torque at a low speed in first gear, which is suitable for drilling holes in objects with low hardness such as wooden boards. When the user moves the shift knob 51 forward, the limiting leg 522 of the shift wire 52 swings backward to drive the shift gear ring 53 to move backward and disengage from the limiting ring 54. The power tool outputs high speed and low torque in second gear, which is suitable for drilling hard objects such as iron plates.

[0033] [Sealing component] The impact drill also includes a sealing component 9, which is disposed between the housing 1 and the outer wall of the gearbox 4 and corresponds to the position of the slide groove 421. The inner wall of the housing 1 is provided with a groove 11 for accommodating the sealing component 9. The area of ​​the sealing component 9 is not less than the area of ​​the slide groove 421. There is a gap (not shown) between the housing 1 and the outer wall of the gearbox 4, and the thickness of the sealing component 9 is greater than or equal to the width of the gap.

[0034] Preferably, there are two sealing components, each corresponding to one of the two grooves.

[0035] Furthermore, the sealing member 9 is provided with a limiting part 91 for limiting the shifting device 5 on the side facing the slide groove 421. There are two limiting parts, which are correspondingly arranged at both ends of the slide groove 421.

[0036] Preferably, the limiting part 91 is a groove, which is disposed at both ends of the slide groove 421 to limit the limiting leg 522 of the shift wire 52.

[0037] The sealing component 9 also includes a fixing part 92, which is disposed between the two limiting parts 91, and the fixing part 92 extends at least partially into the sliding groove 421.

[0038] [Impact Component] The impact assembly 6 includes a static impact ratchet 61, a dynamic impact ratchet 62, a switching seat 63, a bearing, and a spring. The static impact ratchet 61 is fixed to the inner wall of the through hole of the first gearbox housing 41. The dynamic impact ratchet 62 is fixedly sleeved on the output shaft 43 and is located between the static impact ratchet 61 and the switching seat 63. The spring is located between the protrusion of the output shaft 43 and the static impact ratchet 61.

[0039] Furthermore, the static impact ratchet 61 includes at least one protrusion 611, which is stepped.

[0040] The switching seat 63 is disposed in the through hole 4121. The switching seat 63 includes an axially extending convex arm 631 and an extension arm 632 that connects to the convex arm 631 and extends radially. The extension arm 632 can move between abutting the convex post 611 and a position away from the convex post 611.

[0041] During the movement of the moving impact ratchet 62 relative to the static impact ratchet 61, the moving impact ratchet 62 drives the output shaft 43 to perform impact reciprocating motion in the axial direction of the output shaft 43.

[0042] [Electric motor] The motor 8 includes a rotor, a stator, and a motor shaft 81 supporting the rotor and stator. The motor shaft 81 is connected to the rear end of the planetary gear train mechanism, and the output shaft 43 is connected to the front end of the planetary gear train mechanism. The motor shaft 81 extends forward into the gearbox 4 and meshes with the planetary gear train mechanism, thereby driving the planetary gear train mechanism to operate.

[0043] Preferably, the motor 8 is a DC brushless motor.

[0044] Torque Adjustment Component The torque adjustment assembly 2 includes a torque cup 21, a force ring 22, and a clicker 23. The torque cup 21 is used by the user to rotate it to set different torques. The front end of the torque cup is also provided with a chuck for holding tool accessories. The torque cup 21 includes an internal thread and multiple positioning grooves, which are located on the inner ring surface of the torque cup 21. The force ring 22 includes an external thread, which engages with the internal thread of the torque cup 21. During the user's rotation of the torque cup 21, the clicker 23 engages with the positioning grooves and makes a "click" sound to remind the user to pay attention to the current torque.

[0045] [Mode Switching Component] The mode switching component 3 includes a mode switching cover 31, an operating component 32, and an elastic component 33. The mode switching cover 31 is used for the user to rotate and select any one of the drilling mode, impact mode, and screw driving mode.

[0046] The operating component 32 includes a gasket 321, a switching ring 322, and a retaining ring 323. The gasket 321 has an arc-shaped protrusion 3211 on its inner circumference, which engages with the vertical groove to abut against the pin. The switching ring 322 is sleeved on the gasket 321 and includes a positioning part 3221 and a fixing groove 3222. The retaining ring 323 has a pressure plate 3231 on its side, which is used to press the switching ring 322. The retaining ring 323 has multiple protrusions on its upper surface, which abut against the elastic member 33.

[0047] Furthermore, the positioning part 3221 is in the shape of a protrusion and protrudes from the outer circumference of the switching ring 322. The fixing groove 3222 is provided on the inner circumferential surface of the switching ring 322. The switching ring 322 can rotate to the first position, the second position and the third position according to the axis of the first gearbox housing 41.

[0048] Furthermore, the inner wall of the mode switching cover 31 also includes a groove, which is used to engage with the positioning part 3221 of the switching ring 322, so that the mode switching cover 31 can drive the switching ring 322 to rotate during rotation. When the switching ring 322 rotates to the first position, the fixing groove 3222 of the switching ring 322 engages with the annular groove on the first gearbox housing 41, restricting the axial movement of the gasket 321 and the retaining ring 323. When the switching ring 322 rotates to the second or third position, the fixing groove 3222 of the switching ring 322 is misaligned with the annular groove on the first gearbox housing 41, allowing the axial movement of the gasket 321, the switching ring 322, and the retaining ring 323.

[0049] Furthermore, the first position corresponds to the screw-driving mode of the power tool, and the second and third positions correspond to the drilling mode and impact mode of the power tool, respectively.

[0050] According to the solution of this application, when the user switches gears on the power tool, the shift lever moves backward, and the limiting leg of the shift wire slides forward along the slide groove, while driving the shift gear ring to move forward and engage with the limiting ring. The limiting leg is positioned at the limiting part on the right side of the sealing member. At this time, the speed ratio of the transmission component increases, and the power tool maintains a low-speed output in first gear. The shift knob moves forward, and the corresponding limiting leg of the shift wire slides backward along the slide groove, simultaneously driving the shift gear ring to move backward and disengage from the limiting ring. The limiting leg is positioned at the limiting part on the left side of the sealing member. At this time, the speed ratio of the transmission component decreases, and the power tool maintains high-speed output in second gear.

[0051] By installing a sealing component between the outer wall of the gearbox and the housing, and by providing a limiting part on the sealing component, not only can the leakage of grease inside the gearbox be reduced, but the shift cable can also be limited to maintain the gear position of the power tool.

[0052] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An electric tool, comprising: chassis; A gearbox is housed within the housing, the gearbox contains a transmission assembly, and a sliding groove is provided on the outer wall of the gearbox; A gear shifting device that acts on the transmission assembly and extends through the slide groove to the outside of the gearbox; The power tool is characterized in that it further includes a sealing component, which is disposed between the housing and the outer wall of the gearbox and corresponds to the position of the slide groove; The sealing member has a limiting part on the side facing the slide groove for limiting the shifting device.

2. The power tool according to claim 1, characterized in that, The area of ​​the sealing component is not less than the area of ​​the groove.

3. The power tool according to claim 1, characterized in that, The number of limiting parts is two, which are respectively arranged at both ends of the slide groove.

4. The power tool according to claim 3, characterized in that, The limiting part is a groove.

5. The power tool according to claim 4, characterized in that, The power tool also includes a fixing part, which is disposed between the two limiting parts, and the fixing part extends at least partially into the slide groove.

6. The power tool according to claim 5, characterized in that, The sealing element is an elastic soft pad, and the soft pad is square.

7. The power tool according to claim 6, characterized in that, There is a gap between the housing and the outer wall of the gearbox, and the thickness of the sealing element is greater than or equal to the width of the gap.

8. The power tool according to claim 7, characterized in that, The shifting device includes a shifting pusher, a shifting wire, and a shifting gear ring.

9. The power tool according to claim 8, characterized in that, The middle part of the shift wire is connected to the shift push knob. The middle part of the shift wire extends to either side and has a pivot ring, a limiting leg, and a connecting end. The shift gear ring is connected to the transmission assembly. The shift gear ring moves back and forth to drive the transmission assembly to switch gears.

10. The power tool according to claim 9, characterized in that, The shifting push torque drives the shifting wire to rotate and positions the limiting leg on either side of the limiting part to maintain the gear position of the transmission assembly.

Images