Gear shifting structure and electric tool

Abstract

The utility model relates to a gear shifting structure and an electric tool. Comprising a gear shifting push button which is installed on a shell and can move on the shell; the two swing supports are arranged on the two sides of the box body and comprise cylindrical positioning parts and arc-shaped guide parts, the circle centers of the arc-shaped guide parts and the cylindrical positioning parts coincide, the radius of the arc-shaped guide parts is larger than that of the cylindrical positioning parts, and the arc-shaped guide parts and the cylindrical positioning parts are spaced by a preset first gap in the radial direction; the gear shifting fork comprises an ejector rod and two shifting rods extending downwards from the two ends of the ejector rod, the ejector rod is connected with the gear shifting push button, and the lower ends of the shifting rods are connected with the movable gear ring. Semicircular bends are arranged on the two shifting rods so as to be arranged on the cylindrical positioning part in a sleeving mode. When the gear shifting push button moves on the shell, the gear shifting fork can be driven to swing with the swing bearing as the bearing, and then the movable gear ring is driven to move in the axial direction. According to the technical scheme, the process difficulty is reduced, and the size stability of semicircular bending is improved.

Description

Technical Field

[0001] The present application relates to the field of power tools, and particularly to a shifting structure and a power tool. Background Art

[0002] A power tool is a mechanical tool powered by an electric motor or an electromagnet and drives a working head through a transmission mechanism. Power tools have the characteristics of being portable, easy to operate, having diverse functions, being safe and reliable, etc., and can greatly reduce labor intensity, improve work efficiency, and realize the mechanization of manual operations. Power tools are widely used in fields such as construction bridges, housing decoration, machinery industry, agriculture, forestry, animal husbandry and fishery, machining, automotive power, arts and crafts, and horticulture.

[0003] For ease of use in different application scenarios, power tools generally have multiple working modes or working gears. For example, an electric drill has at least two gears: a low-speed gear and a high-speed gear. The gears can be realized through a shifting push button and a shifting fork.

[0004] The current shifting fork is formed by bending a steel wire, and its shape is set as shown in Figure 1 That is, an annular bend is provided in the middle of the lever for sleeving on a swing support. However, the shifting fork designed in this way has problems of large process difficulty of the annular bend and poor dimensional stability. Utility Model Content

[0005] In view of this, the present application provides a shifting structure and a power tool to solve at least one problem in the background art.

[0006] To achieve the above object, the technical solution of the present application is realized as follows:

[0007] In a first aspect, an embodiment of the present application provides a shifting structure applied to a power tool. The power tool includes a housing, a gearbox, and the shifting structure. The gearbox includes a box body and a moving gear ring for shifting. The moving gear ring can move axially in the gearbox to perform shifting. The shifting structure includes:

[0008] A shifting push button, installed on the housing and capable of moving on the housing;

[0009] Two swing supports, arranged on both sides of the box body, including a cylindrical positioning portion and an arc-shaped guiding portion. The centers of the arc-shaped guiding portion and the cylindrical positioning portion coincide. The radius of the arc-shaped guiding portion is greater than the radius of the cylindrical positioning portion, and there is a preset first gap between them in the radial direction;

[0010] The shift fork includes a push rod and two lever rods extending downward from both ends of the push rod. The push rod is connected to the shift push button, and the lower ends of the lever rods are both connected to the moving gear ring. Semi-circular bends are provided on both of the two lever rods to be sleeved on the cylindrical positioning portion. When the shift push button moves on the housing, it can drive the shift fork to swing with the swing support as the support, and then drive the axial movement of the moving gear ring.

[0011] Optionally, the shift fork is made by bending a metal rod.

[0012] Optionally, the lower ends of the two lever rods are provided with extending portions extending towards each other, and the lever rods are connected to the moving gear ring through the extending portions.

[0013] Optionally, through slots are opened on both sides of the box body, and the extending portions pass through the through slots to be connected to the moving gear ring.

[0014] Optionally, a lever rod hole is opened at the position of the moving gear ring corresponding to the through slot, and the shift fork is inserted into the lever rod hole through the extending portion to apply a shifting driving force to the moving gear ring, and then drive the axial movement of the moving gear ring.

[0015] Optionally, the metal rod is a steel wire.

[0016] Optionally, when the semi-circular bend is sleeved on the cylindrical positioning portion, the radial clearance of the semi-circular bend in the first gap is less than a preset value.

[0017] Optionally, the shift push button moves axially on the housing along the axis of the gear box, and the center of the cylindrical positioning portion is located in the middle of the axial movement track of the shift push button in the axial direction of the gear box.

[0018] Optionally, the center of the cylindrical positioning portion is located in the middle of the axial movement track of the moving gear ring in the axial direction of the gear box.

[0019] In a second aspect, an embodiment of the present application provides a power tool, including:

[0020] A housing having an accommodation space;

[0021] A gear box located in the accommodation space. The gear box includes a box body and a moving gear ring for shifting. The moving gear ring can move axially in the gear box to perform shifting;

[0022] Any one of the above-mentioned shifting structures.

[0023] The shift structure and the power tool provided by the embodiments of the present application include: a shift push button, which is installed on the housing and can move on the housing; two swing supports, which are arranged on both sides of the box body and include a cylindrical positioning part and an arc-shaped guiding part. The centers of the arc-shaped guiding part and the cylindrical positioning part coincide. The radius of the arc-shaped guiding part is greater than the radius of the cylindrical positioning part, and the two are radially spaced apart by a preset first gap; a shift fork, which includes a top rod and two shift rods extending downward from both ends of the top rod. The top rod is connected to the shift push button, and the lower ends of the shift rods are both connected to the moving gear ring; semicircular bends are provided on both of the two shift rods to be sleeved on the cylindrical positioning part. When the shift push button moves on the housing, it can drive the shift fork to swing with the swing support as the support, and further drive the axial movement of the moving gear ring. It can be seen that in the shift structure and the power tool provided by the embodiments of the present application, the annular bend in the original shift fork is improved to a semicircular bend, which reduces the process difficulty and improves the dimensional stability of the semicircular bend. Therefore, the shift structure and the power tool provided by the embodiments of the present application reduce the process difficulty and improve the dimensional stability of the semicircular bend.

[0024] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0026] Figure 1 It is a schematic diagram of a shift fork in the prior art;

[0027] Figure 2 It is a schematic diagram of the power tool provided by the embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the shift structure provided by the embodiment of the present application Figure 1 (Shifting to low gear);

[0029] Figure 4 is Figure 3 a partial enlarged schematic diagram of part A in;

[0030] Figure 5 It is a schematic diagram of the shift structure provided by the embodiment of the present application Figure 2 (Shifting to high gear);

[0031] Figure 6 It is a schematic diagram of the box body of the gearbox in the shift structure provided by the embodiment of the present application;

[0032] Figure 7 Schematic diagram of the shift fork in the shift structure provided by the embodiment of the present application;

[0033] Figure 8 is Figure 7 The enlarged schematic diagram at position B in

[0034] Explanation of the reference numerals in the drawings:

[0035] 10. Housing; 20. Gearbox; 21. Moving gear ring; 211. Lever hole; 22. Box body; 23. Through groove; 30. Shift push button; 40. Swing support; 41. Cylindrical positioning portion; 42. Arc-shaped guiding portion; 50. Shift fork; 51. Thumb rod; 52. Lever; 521. Semi-circular bend; 522. Extension portion. Specific embodiments

[0036] To make the technical solutions and beneficial effects of the present application more obvious and understandable, the following will be described in detail by listing specific embodiments. Among them, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which the present application belongs.

[0037] In the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplifying the description of the present application, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present application.

[0038] In the present application, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" may clearly include at least one such feature. In the description of the present application, "a plurality of" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc.; unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly defined, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can also be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In this application, unless otherwise clearly defined, the first feature being "on", "above", "over", "upward", "under", "beneath", "below", or "downward" of the second feature can be that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", or "upward" of the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", or "downward" of the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0041] To thoroughly understand this application, detailed steps and structures will be presented in the following description to explain the technical solutions of this application. The preferred embodiments of this application are described in detail as follows. However, in addition to these detailed descriptions, this application can also have other implementation manners.

[0042] In view of the technical problems in the related art, an embodiment of this application provides a shifting structure, which is applied to a power tool. The power tool includes a housing 10, a gearbox 20, and the shifting structure. The gearbox 20 includes a box body 22 and a moving gear ring 21 for shifting. The moving gear ring 21 can move axially in the gearbox 20 to perform shifting.

[0043] In this embodiment, the power tool can be a drill, refer to Figure 2 . It can be understood that it can also be other power tools adopting a similar shifting structure. Hereinafter, the drill will be mainly used as an example for introduction.

[0044] Refer to Figures 3 - 5 , the shifting structure includes:

[0045] A shifting push button 30, which is installed on the housing 10 and can move on the housing 10;

[0046] Two swing supports 40 are arranged on both sides of the box body 22, including a cylindrical positioning part 41 and an arc-shaped guiding part 42. The centers of the arc-shaped guiding part 42 and the cylindrical positioning part 41 coincide. The radius of the arc-shaped guiding part 42 is greater than the radius of the cylindrical positioning part 41, and there is a preset first gap between them in the radial direction;

[0047] The shift fork 50 includes a push rod 51 and two shift rods 52 extending downward from both ends of the push rod 51. The push rod 51 is connected to the shift push button 30, and the lower ends of the shift rods 52 are both connected to the moving gear ring 21; semi-circular bends 521 are arranged on both of the two shift rods 52 to be sleeved on the cylindrical positioning part 41; when the shift push button 30 moves on the outer shell 10, it can drive the shift fork 50 to swing with the swing support 40 as the support, and then drive the axial movement of the moving gear ring 21.

[0048] It can be understood that the axial direction of the gearbox 20 can be the length direction of the transmission shaft in the gearbox 20. According to the structure and principle of the gearbox 20, the moving gear ring 21 realizes shifting through axial movement in the gearbox 20, and the structure is simpler.

[0049] It can be understood that the shift push button 30 is a switch for the operator to shift gears. It is installed on the outer shell 10 and protrudes from the outer shell 10. It can be moved under the push of a human hand to complete shifting gears.

[0050] It can be understood that setting two swing supports 40 can make the swing of the shift fork 50 more balanced, smooth and stable.

[0051] The cooperation of the cylindrical positioning part 41 and the arc-shaped guiding part 42 can prevent the swing center of the shift fork 50 from changing greatly or even stopping due to resistance or other reasons during swinging. It can be understood that the cylindrical positioning part 41 and the arc-shaped guiding part 42 clamp the shift fork 50 from both sides of the shift fork 50 respectively.

[0052] Also due to the setting of the arc-shaped guiding part 42, the swing center of the shift fork 50 is relatively stable. The annular bend sleeved on the swing support 40 in the prior art can be changed to a semi-circular bend 521, reducing the bending process difficulty and improving the dimensional stability of the semi-circular bend 521.

[0053] It can be understood that the swing of the shift fork 50 with the swing support 40 as the support can be a lever movement. The shift fork 50 is the lever and the cylindrical positioning part 41 is the fulcrum. Among them, the section from one end connecting the shift push button 30 to the fulcrum is the power arm, and the section from the fulcrum to the section connecting the moving gear ring 21 is the resistance arm. From Figure 3As can be seen, the power arm is greater than the resistance arm. Therefore, the shift fork 50 in this embodiment is a force-saving lever.

[0054] Corresponding to the two swing supports 40, the shift fork 50 is provided with two lever rods 52, which are connected together by a push rod 51 to swing synchronously.

[0055] In the shift structure of the embodiment of the present application, the annular bend in the original shift fork 50 is improved to a semi-circular bend 521, which reduces the process difficulty and improves the dimensional stability of the semi-circular bend 521.

[0056] In other embodiments of the present application, the shift fork 50 is made by bending a metal rod.

[0057] The metal material has excellent ductility and can be bent into a shape with higher dimensional accuracy. Moreover, the metal material also has good mechanical properties, such as strength, fatigue performance, etc.

[0058] In other embodiments of the present application, referring to Figure 7 and Figure 8 , the lower ends of the two lever rods 52 are provided with extending portions 522 extending towards each other, and the lever rods 52 are connected to the moving gear ring 21 through the extending portions 522.

[0059] In this way, the problem that the moving gear ring 21 can be connected to the lever rod 52 without protruding from the gearbox 20 can be solved.

[0060] In other embodiments of the present application, referring to Figure 6 , through grooves 23 are opened on both sides of the box body 22, and the extending portions 522 pass through the through grooves 23 to connect the moving gear ring 21.

[0061] Compared with non-contact methods such as magnetic coupling, the direct connection method through the opening of the through grooves 23 has a simpler structure, more reliable connection, and lower cost.

[0062] In other embodiments of the present application, a lever rod hole 211 is opened at the position of the moving gear ring 21 corresponding to the through groove 23, and the shift fork 50 inserts the extending portion 522 into the lever rod hole 211 to apply a shifting driving force to the moving gear ring 21, thereby driving the axial movement of the moving gear ring 21.

[0063] In this way, the connection between the lever rod 52 and the gear ring is more reliable and stable.

[0064] In other embodiments of the present application, the metal rod is a steel wire.

[0065] The steel wire has good strength, fatigue performance, and low cost.

[0066] In some other embodiments of the present application, when the semi-circular bend 521 is sleeved on the cylindrical positioning portion 41, the radial clearance of the semi-circular bend 521 in the first clearance is less than a preset value.

[0067] That is, the clearance is relatively small. In this way, when the shift lever 52 swings, the swing center will not change too much, affecting gear shifting. The preset value can be set according to specific conditions, for example, set according to the size of the swing amplitude. Generally, the preset value can be 0.1 - 0.3 millimeters.

[0068] In some other embodiments of the present application, the shift push button 30 moves axially along the housing 10 in the axial direction of the gearbox 20, and the center of the cylindrical positioning portion 41 is located in the middle of the axial movement track of the shift push button 30 in the axial direction of the gearbox 20.

[0069] In this way, the operation of shifting gears is the most labor-saving.

[0070] Specifically, the shift fork 50 swings under the limitation of the arc-shaped guiding portion 42 of the gearbox 20 and the cylindrical positioning portion 41 to complete the switching from the low gear to the high gear. The two extreme positions of the swing are the first position and the second position respectively. It can be understood that the first position and the second position are the two extreme positions of the movement track of the shift push button 30. Since the movement track of the swing is arc-shaped, when the shift fork 50 moves to the middle of the first position and the second position, the compression amount of the shift lever 52 is the largest. According to the principle of action and reaction of forces, the elastic force generated by the shift lever 52 on the speed regulation push button is also the largest. Therefore, the speed regulation push button will not stop in the middle of the low gear and the high gear, but is pushed by the elastic force to continue moving until it reaches the extreme position.

[0071] In this way, on the one hand, the operation is relatively labor-saving, and on the other hand, the shifting structure does not need to additionally increase the positioning of the speed regulation push button and the machine shell to prevent it from stopping at the position between the low gear and the high gear.

[0072] In some other embodiments of the present application, the center of the cylindrical positioning portion 41 is located in the middle of the axial movement track of the moving gear ring 21 in the axial direction of the gearbox 20.

[0073] As described above, at this end of the gear ring, the shift lever 52 can also generate the maximum elastic force in the middle. Therefore, it is set in this way and will not be elaborated further.

[0074] The embodiments of the present application further provide a power tool, including:

[0075] A housing 10 having an accommodation space;

[0076] The gearbox 20 is located within the accommodation space. The gearbox 20 includes a box body 22 and a moving ring gear 21 for shifting gears. The moving ring gear 21 can move axially within the gearbox 20 to effect gear shifting.

[0077] The shifting structure described above.

[0078] In the electric tool according to the embodiment of the present application, the annular bend in the original shifting fork 50 is improved to a semi-circular bend 521, which reduces the process difficulty and improves the dimensional stability of the semi-circular bend 521.

[0079] It should be understood that the above embodiments are all exemplary and are not used to cover all possible implementation manners included in the claims. Without departing from the scope of the disclosure of the present application, various deformations and changes can also be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can also be arbitrarily combined to form additional embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A shifting structure, applied to an electric tool, the electric tool comprising a housing, a gear box and the shifting structure, the gear box comprising a housing and a shifting movable gear ring, the movable gear ring being able to move axially in the gear box to shift gears, characterized in that: The shifting structure comprises: A gear shift push knob is installed on the housing and can move on the housing; Two swing supports are arranged on both sides of the box body, including a cylindrical positioning portion and an arc-shaped guide portion, the centers of the arc-shaped guide portion and the cylindrical positioning portion coincide, the radius of the arc-shaped guide portion is greater than the radius of the cylindrical positioning portion, and the two are spaced apart by a preset first gap in the radial direction; The shift fork comprises a push rod and two levers extending downward from both ends of the push rod, wherein the push rod is connected to the shift push knob, and the lower ends of the levers are connected to the movable gear ring; a semicircular bend is provided on the two levers to be sleeved on the cylindrical positioning portion; when the shift push knob moves on the outer shell, it can drive the shift fork to swing with the swing support as the support, thereby driving the axial movement of the movable gear ring.

2. The shift structure according to claim 1, characterized in that: The shift fork is made by bending a metal rod.

3. The shift structure according to claim 2, characterized in that: The lower ends of the two shifting rods are provided with extending parts extending towards each other, and the shifting rods are connected to the movable gear ring through the extending parts.

4. The shift structure according to claim 3, characterized in that: Through slots are provided on both sides of the box body, and the extension portion passes through the through slots to connect with the movable gear ring.

5. The shift structure according to claim 4, characterized in that: A shift rod hole is formed at a portion of the movable gear ring corresponding to the through slot, and the shift fork is inserted into the shift rod hole through the extension portion to apply a shifting driving force to the movable gear ring, thereby driving the axial movement of the movable gear ring.

6. The shift structure according to claim 2, characterized in that: The metal rod is a steel wire.

7. The shift structure according to claim 4, characterized in that: When the semicircular bend is sleeved on the cylindrical positioning portion, the radial clearance of the semicircular bend in the first gap is smaller than a preset value.

8. The shift structure according to any one of claims 1 to 7, characterized in that: The shift push knob moves on the housing along the axial direction of the gear box, and the center of the cylindrical positioning portion is located in the middle of the axial movement trajectory of the shift push knob in the axial direction of the gear box.

9. The shift structure according to any one of claims 1 to 7, characterized in that: The center of the cylindrical positioning portion is located in the middle of the axial movement trajectory of the movable gear ring in the axial direction of the gear box.

10. An electric tool, characterized in that: include: A housing having a receiving space; A gear box is located in the accommodating space, the gear box comprises a housing and a movable gear ring for shifting gears, and the movable gear ring can move axially in the gear box to perform gear shifting; The shift structure according to any one of claims 1 to 9.

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