Transmission switching mechanism and electric tool

Abstract

The invention provides a transmission switching mechanism and an electric tool. The transmission switching mechanism comprises a transmission shaft and a transmission gear which comprise first matching structures; the swing rod bearing sleeves the transmission shaft and comprises a second matching structure; the switching element is connected to the transmission shaft in a sleeving mode and located between the transmission gear and the swing rod bearing, the switching element comprises a first meshing part and a second meshing part, the shape of the first meshing part is configured to be matched with the first matching structure, and the shape of the second meshing part is configured to be matched with the second matching structure; the switching element is at least provided with a first position and a second position, in the first position, the first meshing part and the first matching structure as well as the second meshing part and the second matching structure are engaged and driven, and in the second position, the first meshing part and the first matching structure are disengaged; the elastic piece is positioned between the switching element and the swing rod bearing; and a drive pin in contact with the switching element and movable so as to switch the switching element between the first position and the second position.

Description

Technical Field

[0001] The present application relates to the field of power tool structures. More specifically, the present application relates to a transmission switching mechanism, which is intended to provide more transmission solutions. The present application also relates to a power tool, which includes the above-mentioned transmission switching mechanism. Background Art

[0002] Handheld power tools include drilling tools. For example, a drilling tool can be an electric drill. Electric drills typically have multiple output modes, such as a pure drill mode, an impact drill mode, and a chisel mode. Handheld power tools often include a switch knob to switch between these output modes. Existing switching mechanisms typically employ a mechanical snap-on design and require numerous components to operate. Summary of the Invention

[0003] One object of the present application is to provide a transmission switching mechanism that provides fast and flexible working mode switching. Another object of the present application is to provide an electric tool that includes the transmission switching mechanism.

[0004] The purpose of this application is achieved through the following technical solutions: A transmission switching mechanism, comprising: a transmission shaft extending in an axial direction and having an upstream end coupled to the motor; a transmission gear coupled to a downstream end of the transmission shaft, wherein the transmission shaft and / or the transmission gear includes a first mating structure; a rocker bearing, which is sleeved on the transmission shaft and includes a second matching structure; A switching element is sleeved on the transmission shaft and located between the transmission gear and the rocker bearing, and includes a first meshing portion and a second meshing portion, wherein the first meshing portion is configured to match the first matching structure, and the second meshing portion is configured to match the second matching structure; The switching element has at least a first position and a second position, wherein in the first position, the first meshing portion is engaged with the first matching structure and transmits power, and the second meshing portion is engaged with the second matching structure and transmits power, and in the second position, the first meshing portion is disengaged from the first matching structure; an elastic member positioned between the switching element and the rocker bearing and in a compressed state, wherein an elastic force of the elastic member tends to push the switching element toward the first position; and A drive pin is in contact with the switching element and is movable to switch the switching element between the first position and the second position.

[0005] An electric tool comprising: The transmission switching mechanism mentioned above; a housing accommodating a transmission switching mechanism; a motor disposed within the housing and coupled to the transmission shaft via a reduction gear; an output mechanism coupled to the transmission gear through a transmission device, and a rocker bearing being configured to be associated with the output mechanism; and a knob disposed outside the housing and connected to the drive pin such that the switching element switches between the first position and the second position under operation of the knob. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will appreciate that these drawings are drawn only for the purpose of illustrating the preferred embodiments and, therefore, should not be construed as limiting the scope of the present application. Furthermore, unless otherwise noted, the drawings are intended only to conceptually represent the composition or configuration of the depicted objects and may contain exaggerated illustrations. The drawings are not necessarily drawn to scale.

[0007] Figure 1 It is an exploded view of an embodiment of the transmission switching mechanism of the present application.

[0008] Figure 2 yes Figure 1 A perspective view of the switching element is shown.

[0009] Figure 3 yes Figure 2 Cross-sectional view of the illustrated embodiment.

[0010] Figure 4 1 is a partial schematic diagram of an embodiment of the power tool of the present application in operation, wherein the switching element is in the first position.

[0011] Figure 5 yes Figure 4 Cross-sectional view of the illustrated embodiment.

[0012] Figure 6 1 is a partial schematic diagram of an embodiment of the power tool of the present application in operation, wherein the switching element is in the second position.

[0013] Figure 7 yes Figure 6 Cross-sectional view of the illustrated embodiment.

[0014] Figure 8 yes Figure 6 A perspective view of the illustrated embodiment. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present application.

[0016] First, it should be noted that directional terms such as top, bottom, upward, and downward, as used herein, are defined relative to the directions in the respective figures. These directions are relative and will vary depending on the position and state of the device. Therefore, these and other directional terms should not be construed as limiting.

[0017] In addition, it should be pointed out that for any single technical feature described or implied in the embodiments of this document or any single technical feature shown or implied in the accompanying drawings, these technical features (or their equivalents) can be further combined to obtain other embodiments not directly mentioned in this document.

[0018] It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

[0019] Figures 1 to 3 1 shows various aspects of an embodiment of a transmission switching mechanism 10 of the present application. The transmission switching mechanism 10 may include: a transmission shaft 100, a transmission gear 200, a rocker bearing 300, a switching element 400, an elastic member 500, and a driving pin 600.

[0020] The transmission shaft 100 may extend along the axial direction AA. The upstream end of the transmission shaft 100 is coupled to a motor (not shown), and the downstream end thereof may be coupled to the transmission gear 200. In one embodiment, a speed reduction mechanism may be arranged between the transmission shaft 100 and the motor. Figure 1 In the illustrated embodiment, the various components are arranged around the axial direction AA of the transmission shaft 100, or are sleeved on the transmission shaft 100. The transmission shaft 100 may also include a first mating structure 110. In the illustrated embodiment, the first mating structure 110 may be disposed on the left side of the transmission shaft 100 and may be disposed on the outer surface of the transmission shaft 100. The first mating structure 110 may include a series of teeth, each of which may extend along the axial direction AA and be substantially evenly distributed along the entire outer circumference of the transmission shaft 100.

[0021] The axial direction AA referred to herein may be the length direction or extension direction of the transmission shaft 100. In one embodiment, the transmission shaft 100 may rotate with the axial direction AA as the rotation axis. The radial direction RR referred to herein may be the direction pointed by a ray extending from a point on the axial direction AA in a plane perpendicular to the axial direction AA. Figure 1, the radial direction RR is schematically shown as the up-down direction.

[0022] The transmission gear 200 may be coupled to the downstream end of the transmission shaft 100. In one embodiment, a first mating structure may be provided on the transmission gear 200. In one embodiment, the transmission gear 200 may also be referred to as a pinion. The outer surface of the transmission gear 200 may include a gear structure for coupling with the transmission 31.

[0023] The rocker bearing 300 can be sleeved on the transmission shaft 100 so that the transmission shaft 100 can rotate inside the rocker bearing 300. The rocker bearing 300 may include a second mating structure 320. In one embodiment, the second mating structure 320 may be arranged on the outer surface of the rocker bearing 300, for example, on the left side of the rocker bearing 300. Similarly, the second mating structure 320 may include a series of teeth. Each tooth may be configured to extend along the axial direction AA and be evenly distributed along the entire outer circumference of the rocker bearing 300. Figure 1 As shown, the rocker bearing 300 may include a protrusion extending in the radial direction RR so as to be coupled to the impact device 301 .

[0024] The switching element 400 can be sleeved on the transmission shaft 100 and located between the transmission gear 200 and the rocker bearing 300. Figure 2 and Figure 3 As shown, the switching element 400 may include: a first meshing portion 410, a second meshing portion 420, and a flange portion 430. The interior of the switching element 400 may include a through hole extending in the axial direction AA, and the through hole may include different parts. For example, the meshing portion 410 may be arranged on the inner wall at one end of the switching element 400, and the first meshing portion 410 may be shaped and configured to adapt to the first matching structure 110. For another example, the second meshing portion 420 may be arranged on the inner wall at the other end of the switching element 400, and the second meshing portion 420 may be shaped and configured to adapt to the second matching structure 320.

[0025] In one embodiment, the switching element 400 has at least a first position and a second position. In the first position, the first engaging portion 410 engages with the first mating structure 110 and transmits power, while the second engaging portion 420 engages with the second mating structure 320 and transmits power. In the second position, the first engaging portion 410 is disengaged from the first mating structure 110. The first and second positions, as well as the transmission relationship, will be explained in detail below with reference to other figures.

[0026] The switching element 400 may further include a flange portion 430. The flange portion 430 may be arranged around the entire periphery of the switching element 400 and may protrude in a radial direction RR relative to the outer surface of the switching element 400. In some operating modes, the drive pin 600 may be positioned to rest on the flange portion 430. In one embodiment, the flange portion 430 may include a plurality of protrusions or recesses, and the drive pin 600 may be shaped to mate with the protrusions or recesses so that the drive pin 600 is fixed in place relative to the flange portion 430. In another embodiment, the flange portion 430 may include a plurality of ribs 431, and the drive pin 600 may abut against one side of the ribs 431 so that the drive pin 600 is fixed in place relative to the flange portion 430. Each rib 431 may extend generally along the radial direction RR and may be spaced apart from each other so that there is sufficient clearance between adjacent ribs 431 to accommodate the drive pin 600. In the illustrated embodiment, the flange portion 430 may be positioned at a side of the switching element 400 close to the rocker bearing 300 , that is, Figure 1 On the right side of the .

[0027] The elastic member 500 can be positioned between the switching element 400 and the rocker bearing 300 and is always under pressure. The elastic force of the elastic member 500 tends to push the switching element 400 to the first position, or in other words, tends to push the switching element 400 to the left. In one embodiment, the elastic member 500 can be sleeved on the transmission shaft 100 and positioned within a cavity inside the switching element 400. Therefore, in some embodiments, the elastic member 500 is not visible from the outside. In one embodiment, the elastic member 500 can be a spring, a torsion spring, a spring, or any other suitable elastic device.

[0028] The drive pin 600 can selectively contact the switching element 400 and is movable so as to switch the switching element 400 between the first position and the second position. In one embodiment, the drive pin 600 can be a Z-shaped rod-like structure. For example, one end of the drive pin 600 can be connected to a knob not shown, and the other end of the drive pin 600 selectively contacts the switching element 400. More specifically, the other end of the drive pin 600 can selectively contact the flange portion 430 of the switching element 400 and can abut against one of the multiple ribs 431. The drive pin 600 can be a generally cylindrical structure, and according to actual needs, the drive pin 600 can also have other shapes or contours.

[0029] Figures 4 to 8 The different states of the transmission switching mechanism and the electric tool of the present application during operation are shown. Figures 4 to 5 The switching element 400 is shown in a first position, and Figures 6 to 8 The switching element 400 is shown in the second position.

[0030] Figures 4 to 8 In addition to the components in one embodiment of the power tool of the present application, the power tool may include: the transmission switching mechanism 10, a housing, a motor, a speed reduction mechanism 21, an output mechanism 30, a transmission mechanism 31, a knob, etc.

[0031] The housing can accommodate the transmission switching mechanism 10 and other components. The motor can be arranged in the housing and connected to the transmission shaft 100 through the reduction gear 21. More specifically, Figures 4 to 8 The portion in the lower right corner of the center can be referred to as the reduction gear 21. The output mechanism 30 can be coupled to the transmission gear 200 via a transmission 31, and a rocker bearing 300 is disposed in association with the output mechanism 30. The transmission 31 can include one or more gear pairs. More specifically, an impact device 301 of the rocker bearing 300 can be disposed at one end of the output mechanism 30. A knob can be disposed externally of the housing and connected to the drive pin 600, enabling the switching element 400 to switch between a first position and a second position upon operation of the knob.

[0032] In the first position, the drive pin 600 is separated from the flange portion 430 of the switching element 400, and the switching element 400 tends to move to the left under the action of the elastic member 500. At this time, the first engaging portion 410 of the switching element 400 engages with and transmits the first mating structure 110, and the second engaging portion 420 of the switching element 400 engages with and transmits the second mating structure 320. In this way, the rotation of the transmission shaft 100 can be transmitted to the rocker bearing 300 through the switching element 400. Therefore, the rocker bearing 300 generates intermittent reciprocating impact motion on the output mechanism 30 through the impact device 301. At the same time, the rotational motion of the transmission shaft 100 can be transmitted to the output mechanism 30 and form the rotational motion of the drill bit. The above two motions are superimposed and output to produce the impact drilling mode of the power tool.

[0033] In the second position, the drive pin 600 pivots relative to the drive pin 600 in the first position and contacts the flange portion 430 of the switching element 400, and the switching element 400 overcomes the elastic force of the elastic member 500 and tends to move toward the left. At this time, the first engaging portion 410 of the switching element 400 is disengaged from the first mating structure 110, and the second engaging portion 420 of the switching element 400 is engaged with the second mating structure 320. At this time, the rocker bearing 300 no longer receives output and stops operating, and the rotational motion of the transmission shaft 100 can be transmitted to the output mechanism 30 and form the rotational motion of the drill bit. In this way, the power tool of the present application provides a simple drilling mode.

[0034] In addition, in each of the drawings, the elastic member 500 is always in a compressed state. Figures 6 to 8The compression degree of the elastic member 500 is higher than Figures 4 to 5 The degree of compression of the elastic member 500 in FIG.

[0035] The transmission switching mechanism and electric tool of the present application have the advantages of being simple, reliable, easy to implement, and convenient to use. The transmission switching mechanism of the present application provides a simple and reliable mechanical switching solution, reducing production and assembly costs.

[0036] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to practice the present application, including making and using any device or system, selecting suitable materials, and using any combined methods. The scope of the present application is defined by the claimed technical solution and includes other examples that occur to those skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the claimed technical solution, or such other examples include equivalent structural elements that are not substantially different from the literal language of the claimed technical solution, such other examples should be deemed to be within the scope of protection determined by the claimed technical solution.

Claims

1. A transmission switching mechanism, characterized in that: include: a drive shaft (100) extending in an axial direction (AA) and having an upstream end coupled to the motor; a transmission gear (200) coupled to a downstream end of the transmission shaft (100), wherein the transmission shaft (100) and / or the transmission gear (200) includes a first mating structure (110); A rocker bearing (300) is sleeved on the transmission shaft (100) and includes a second matching structure (320); A switching element (400) is sleeved on the transmission shaft (100) and located between the transmission gear (200) and the rocker bearing (300), and includes a first meshing portion (410) and a second meshing portion (420), wherein the first meshing portion (410) is configured to match the first matching structure (110), and the second meshing portion (420) is configured to match the second matching structure (320); The switching element (400) has at least a first position and a second position, wherein in the first position, the first engaging portion (410) engages with and transmits to the first matching structure (110), and the second engaging portion (420) engages with and transmits to the second matching structure (320), and in the second position, the first engaging portion (410) is disengaged from the first matching structure (110); an elastic member (500) positioned between the switching element (400) and the rocker bearing (300) and in a compressed state, wherein the elastic force of the elastic member (500) tends to push the switching element (400) toward the first position; and A driving pin (600) contacts the switching element (400) and is movable so as to switch the switching element (400) between the first position and the second position.

2. The transmission switching mechanism according to claim 1, characterized in that: The first matching structure (110) is arranged on the outer surface of the transmission shaft (100), and the first engaging portion (410) is arranged on the inner wall at one end of the switching element (400).

3. The transmission switching mechanism according to claim 2, characterized in that: The second matching structure (320) is arranged on the outer surface of the rocker bearing (300), and the second engaging portion (420) is arranged on the inner wall at the other end of the switching element (400).

4. The transmission switching mechanism according to claim 1, characterized in that: The switching element (400) further includes a flange portion (430), which is arranged around the outer periphery of the switching element (400) and protrudes in a radial direction (RR) relative to the outer surface of the switching element (400); wherein the drive pin (600) is positioned to rest on the flange portion (430).

5. The transmission switching mechanism according to claim 4, characterized in that: The flange portion (430) includes a plurality of protrusions or recesses, and the drive pin (600) is shaped to fit into the protrusions or recesses, so that the drive pin (600) is fixed in position relative to the flange portion (430).

6. The transmission switching mechanism according to claim 4, characterized in that: The flange portion (430) includes a plurality of ribs (431), and the drive pin (600) abuts against one side of the ribs (431), so that the drive pin (600) is fixed in position relative to the flange portion (430).

7. The transmission switching mechanism according to claim 4, characterized in that: The flange portion (430) is positioned at a side of the switching element (400) close to the rocker bearing (300).

8. The transmission switching mechanism according to any one of claims 1 to 7, characterized in that: The elastic member (500) is sleeved on the transmission shaft (100) and positioned within a cavity inside the switching element (400).

9. The transmission switching mechanism according to any one of claims 1 to 7, characterized in that: The first mating structure (110) and / or the second mating structure (320) comprises a series of teeth extending along an axial direction (AA) and uniformly distributed along the entire outer circumference of the transmission shaft (100) and / or the rocker bearing (300).

10. An electric tool, characterized in that: include: The transmission switching mechanism (10) according to any one of claims 1 to 9; a housing for accommodating the transmission switching mechanism (10); a motor disposed within the housing and coupled to the transmission shaft (100) via a reduction gear (21); an output mechanism (30) coupled to the transmission gear (200) via a transmission device (31), and the rocker bearing (300) is provided in association with the output mechanism (30); as well as A knob is arranged outside the housing and connected to the driving pin (600), so that the switching element (400) switches between the first position and the second position under the operation of the knob.

Images