Electric tool
By using bearings of the same specifications in the power tool for axial abutment setting, and combining the design of the torque adjustment sleeve and gear box, the problem of increasing the length of the power tool gear box is solved, and the tool is lightweight and portable development is achieved. , while reducing costs.
Patent Information
- Application Number
- CN202421147314.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The gearbox design of existing power tools increases the length of the output shaft, hinders the development of lightweight and portability of the tool, while increasing processing and material costs.
At least two bearings of the same specification are arranged in the axial direction, and the position of the bearing is limited and the length of the output shaft is reduced by the fitting of the torque adjustment sleeve and the gear box.
The power tools are lightweight and portable, while reducing costs and reducing the output shaft jump.
Smart Images
Figure CN222470810U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of handheld tools, and in particular to an electric tool. Background Art
[0002] Among hand-held tools, electric tools are more environmentally friendly. Electric drills are a common electric tool, mainly used for drilling holes. Electric tools, such as electric drills, generally have multiple speeds to adapt to workpieces of different materials and sizes. Therefore, electric tools are generally equipped with gear boxes.
[0003] With the further development of technology, the lightweight and portability of power tools is a development trend.
[0004] In the prior art, an output shaft is provided at one end of the gearbox of the power tool. In order to make the output shaft more stable under load, the output shaft sleeve is provided with two bearings distributed in the axial direction. However, such a design increases the length of the output shaft in the gearbox and increases the axial length of the gearbox, which is not conducive to the development of power tools in the direction of lightweight and portability. In addition, in order to position the two bearings in the axial direction, it is necessary to add a step and a shaft retaining ring and other structures for positioning the bearings on the output shaft, which increases the processing cost and material cost. Summary of the invention
[0005] In view of this, an embodiment of the present application provides an electric tool to solve at least one problem existing in the background technology.
[0006] To achieve the above purpose, the technical solution of this application is implemented as follows:
[0007] An embodiment of the present application provides an electric tool, characterized in that the electric tool comprises:
[0008] A gear box for accommodating a reduction gear mechanism;
[0009] An output shaft, one end of which is inserted into the gear box and the other end is used to assemble the tool head;
[0010] At least two bearings, at least two bearings have the same specifications and are axially abutted in sequence, the inner ring of the bearing is sleeved on the outer periphery of the output shaft, and the outer periphery of the bearing is supported by the gear box;
[0011] The torque adjustment sleeve extends along the axial direction of the output shaft and is sleeved on the outer circumference of the gear box. One end of the torque adjustment sleeve is provided with a first abutment portion extending in the radial direction, and the gear box is provided with a second abutment portion; at least two of the bearings are limitedly located between the first abutment portion and the second abutment portion.
[0012] Optionally, the torque adjustment sleeve is provided with a connected cylinder and an end cover, the cylinder is sleeved on the gear box, the end cover is provided with a through hole for the output shaft to pass through, and one end of the end cover away from the cylinder is bent inward to form the first abutment portion.
[0013] Optionally, the electric tool further comprises a casing, and the torque adjustment sleeve and the casing are rotatably connected by means of a snap-fit protrusion and a snap-fit groove.
[0014] Optionally, the torque adjustment sleeve is provided with a first slot, and the housing is provided with a first protrusion, and the first protrusion is engaged with the first slot and the two are clearance-matched.
[0015] Optionally, the first locking groove is provided on the outer wall of the torque adjustment sleeve, and one end of the housing is at least partially bent inward to form the first locking protrusion.
[0016] Optionally, the groove wall of the first clamping groove extends radially outward to form a third abutment portion, and the first clamping protrusion axially abuts against the third abutment portion.
[0017] Optionally, the output shaft is provided with a shaft shoulder, and the front end surface of the bearing abuts against the shaft shoulder.
[0018] Optionally, the output shaft comprises a shaft body, a shaft shoulder is arranged on the shaft body, and a narrowing section is arranged at one end of the shaft body away from the tool head, and the narrowing section gradually narrows in a direction away from the tool head.
[0019] Optionally, the electric tool further comprises a drill chuck, wherein the drill chuck comprises a sleeve for clamping the drill bit; a rear end face of the sleeve abuts against the shaft shoulder.
[0020] Optionally, the number of the bearings is two.
[0021] The electric tool provided in the embodiment of the present application includes: a gear box, which is used to accommodate a reduction gear mechanism; an output shaft, one end of which is inserted into the gear box, and the other end is used to assemble a tool head; at least two bearings, at least two of which have the same specifications and are axially abutted in sequence, the inner ring of the bearing is sleeved on the outer periphery of the output shaft, and the outer periphery of the bearing is supported by the gear box; a torque adjustment sleeve, which extends along the axial direction of the output shaft and is sleeved on the outer periphery of the gear box, one end of which is provided with a first abutment extending in the radial direction, and the gear box is provided with a second abutment; at least two of the bearings are limited between the first abutment and the second abutment. It can be seen that the electric tool of the embodiment of the present application sets at least two bearings of the same specifications in axial abutment, which is conducive to the development of the electric tool in the direction of lightweight and portability, and is also conducive to reducing costs. In addition, the two bearings are arranged side by side, which increases the matching area with the output shaft, which is conducive to reducing the output shaft runout. Therefore, the electric tool of the embodiment of the present application is conducive to the development of the electric tool in the direction of lightweight and portability, and is also conducive to reducing costs and reducing the output shaft runout.
[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0024] Figure 1 A schematic diagram of an electric tool provided in an embodiment of the present application;
[0025] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;
[0026] Figure 3 for Figure 2 The enlarged schematic diagram of point B in the middle;
[0027] Figure 4 for Figure 2 Enlarged schematic diagram of point C in the middle.
[0028] Description of reference numerals:
[0029] 10. Gearbox; 11. Second abutment; 20. Output shaft; 21. Shaft body; 22. Shoulder; 23. Narrowing section; 31. First bearing; 32. Second bearing; 60. Housing; 61. First cam; 70. Torque adjustment sleeve; 71. Cylinder body; 72. End cover; 721. First abutment; 73. First slot; 731. Third abutment. DETAILED DESCRIPTION
[0030] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following is a detailed description by listing specific embodiments. 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.
[0031] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.
[0032] In this application, the terms "first" and "second" are used only for the purpose of clear description and should not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of this application, "multiple" 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.
[0033] In this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0034] In the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.
[0035] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.
[0036] In view of the technical problems in the related art, the present application provides an electric tool, referring to Figure 1 and Figure 2 , the electric tool comprises:
[0037] A gear box 10 for accommodating a reduction gear mechanism;
[0038] An output shaft 20, one end of which is inserted into the gear box 10, and the other end is used to assemble the tool head;
[0039] At least two bearings, at least two bearings have the same specifications and are axially abutted in sequence, the inner ring of the bearing is sleeved on the outer periphery of the output shaft 20, and the outer periphery of the bearing is supported by the gear box 10;
[0040] The torque adjustment sleeve extends along the axial direction of the output shaft 20 and is sleeved on the outer circumference of the gear box 10. One end of the torque adjustment sleeve is provided with a first abutment portion 721 extending in the radial direction. The gear box 10 is provided with a second abutment portion 11; at least two of the bearing limits are located between the first abutment portion 721 and the second abutment portion 11.
[0041] It can be understood that the gearbox 10 can be used for speed change, such as speed reduction or speed increase, in addition to transmitting power, and can also be used to increase or reduce torque. The gearbox 10 can include two openings for power input and power output, and the output shaft 20 is inserted into the gearbox 10 from the power output opening, and then the power is output through the output shaft 20, that is, output to the tool head.
[0042] It should be noted that the output shaft 20 is connected to the tool head, transmits power to the tool head, and also bears the reaction force of the tool head. Therefore, in the prior art, two non-abutting bearings are generally set on the output shaft 20 to increase the stability of the output shaft 20. However, setting two non-abutting bearings increases the length of the output shaft 20 in the gear box 10, increases the axial length of the gear box 10, and is not conducive to the development of power tools in the direction of lightweight and portability. In addition, in order to prevent the output shaft 20 from being pulled out due to force during work, the output shaft 20 generally uses a shoulder 22 and a shaft elastic retaining ring and other parts that limit the axial position of the bearing, thereby limiting the position of the output shaft 20. In this way, on the one hand, it is necessary to add a step and a shaft retaining ring to the output shaft 20 to position the bearing structure, which increases the processing cost and material cost. On the other hand, it increases the assembly process and reduces the production efficiency. The power tool of the present application can be improved to reduce or avoid the above-mentioned shortcomings.
[0043] Specifically, the bearing may be a rolling bearing, which generally includes an outer ring, balls and an inner ring, wherein the outer ring matches the inner wall of the accommodating cavity, the inner ring matches the outer circle of the output shaft 20, and the balls are between the outer ring and the inner ring.
[0044] In this embodiment, at least two of the bearings are of the same specification, which not only reduces the number of parts such as retaining rings, but also allows at least two bearings to be pressed into the output shaft 20 at one time, further improving production efficiency. Specifically, at least two of the bearings are of the same specification, which means that all the bearings located between the first abutting portion 721 and the second abutting portion 11 are of the same specification.
[0045] In detail, when the bearing is installed in the gear box 10, the axial direction of the bearing abuts the second abutting portion 11, that is, it is installed in a predetermined position. Specifically, the bearing abutting the second abutting portion 11 may be the bearing facing the accommodating cavity, that is, the first bearing 31 away from the load. The second bearing 32 facing outward abuts from the outside of the accommodating cavity to the inside through the first abutting portion 721, so that at least two bearings are fixed between the first abutting portion 721 and the second abutting portion 11.
[0046] Specifically, the second abutting portion 11 and the housing of the gear box 10 are integrally cast, which not only has high strength but also does not require assembly and has high production efficiency.
[0047] The electric tool of the embodiment of the present application has at least two bearings of the same specification arranged against each other in the axial direction, which is conducive to the development of the electric tool in the direction of lightness and portability, and is also conducive to reducing costs. In addition, the two bearings are arranged side by side, which increases the matching area with the output shaft 20, which is conducive to reducing the output shaft 20 from jumping.
[0048] Specifically, the embodiments of the present application are introduced using an electric drill as an example, but it can be understood that other types of electric tools can also be implemented.
[0049] In other embodiments of the present application, reference Figure 2 and Figure 3 The torque adjustment sleeve is provided with a connected cylinder 71 and an end cover 72. The cylinder 71 is sleeved on the gear box 10. The end cover 72 is provided with a through hole for the output shaft 20 to pass through. One end of the end cover 72 away from the cylinder 71 is bent inward to form the first abutment portion 721.
[0050] In this way, the strength of the first abutting portion 721 can be increased. Specifically, the first abutting portion 721 is formed integrally with the end cover 72 .
[0051] In other embodiments of the present application, continue to refer to Figure 2 The electric tool further comprises a housing 60, and the torque adjustment sleeve and the housing 60 are rotatably connected by means of a snap-fit protrusion and a snap-fit groove.
[0052] In this way, the connection is more convenient, and the torque adjustment sleeve can rotate relative to the housing 60 to facilitate the torque adjustment sleeve to adjust the torque.
[0053] In other embodiments of the present application, reference Figure 4 The torque adjustment sleeve is provided with a first slot 73, and the housing 60 is provided with a first protrusion 61. The first protrusion 61 is engaged with the first slot 73 and the two are clearance-matched.
[0054] It is understandable that the clearance fit can simplify assembly. Specifically, the clearance between the two can be: the torque adjustment sleeve can smoothly rotate circumferentially on the housing 60, but there is no radial or axial movement.
[0055] In this way, the torque adjustment sleeve 70 and the housing 60 are fixed to each other in the axial direction by the engaging protrusion and the engaging groove. At the same time, it can be seen from the figure that the back of the torque adjustment sleeve 70 connected to the housing 60 abuts against the gear box 10, so the torque adjustment sleeve 70 is also fixed in the radial direction under the joint action of the housing 60 and the gear box 10.
[0056] Specifically, the first clamping groove 73 is provided on the outer wall of the torque adjustment sleeve, and one end of the housing 60 is at least partially bent inward to form the first clamping protrusion 61. In this way, the end of the housing 60 facing the load does not reduce strength due to the groove.
[0057] In other embodiments of the present application, reference Figure 4The groove wall of the first locking groove 73 extends radially outward to form a third abutment portion 731 , and the first locking protrusion 61 axially abuts against the third abutment portion 731 .
[0058] In this way, the axial abutment area is larger and the axial position is more stable.
[0059] In other embodiments of the present application, continue to refer to Figure 2 The output shaft 20 is provided with a shaft shoulder 22 , and the front end surface of the bearing abuts against the shaft shoulder 22 .
[0060] That is, in addition to the first abutting portion 721 and the second abutting portion 11 positioning at least two bearings, the axial position is further fixed by the shaft shoulder 22, making the position of the bearing more stable. The first abutting portion 721 and the second abutting portion 11 are both against the outer ring end face of the bearing, and the shaft shoulder 22 is against the inner ring end face of the bearing.
[0061] The shaft shoulder 22 abuts against the end surface of the second bearing 32 from outside the accommodating cavity to inside; the second bearing 32 is the bearing closer to the load among the at least two bearings.
[0062] Specifically, the bearing may be pressed into the accommodation cavity first, and then the output shaft 20 may be pressed in. Alternatively, the bearing may be pressed into the output shaft 20, and then the output shaft 20 with the bearing installed may be pressed into the accommodation cavity.
[0063] In other embodiments of the present application, continue to refer to Figure 2 The output shaft 20 includes a shaft body 21, a shaft shoulder 22 is arranged on the shaft body 21, and a narrowing section 23 is arranged at one end of the shaft body 21 away from the tool head, and the narrowing section 23 gradually narrows in a direction away from the tool head.
[0064] In this way, it plays a guiding role in the process of press-fitting the bearing, facilitating assembly and reducing press-fitting damage. Since the outer circle of the shaft body 21 and the inner hole of the bearing can be interference fit, the narrowing section 23 can make the installation of the bearing and the output shaft 20 smoother and reduce damage during press-fitting.
[0065] In some other embodiments of the present application, the electric tool further comprises a drill chuck, and the drill chuck comprises a sleeve for clamping the drill bit; the rear end face of the sleeve abuts against the shaft shoulder 22 .
[0066] In this way, the axial position of the output shaft 20 can be further fixed, and the axial movement during the force application process can be reduced.
[0067] In some other embodiments of the present application, the number of the bearings is two.
[0068] In this way, the above-mentioned technical problems can be solved with low cost.
[0069] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope disclosed in the present application. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.
Claims
1. An electric tool, characterized in that: The electric tool comprises: A gear box (10) for accommodating a reduction gear mechanism; An output shaft (20), one end of which is inserted into the gear box (10) and the other end of which is used to assemble a tool head; At least two bearings, at least two bearings having the same specifications and axially abutting against each other in sequence, the inner rings of the bearings being sleeved on the outer periphery of the output shaft (20), and the outer periphery of the bearings being supported by the gear box (10); The torque adjustment sleeve (70) extends along the axial direction of the output shaft (20) and is sleeved on the outer circumference of the gear box (10), and one end of the torque adjustment sleeve is provided with a first abutment portion (721) extending in a radial direction, and the gear box (10) is provided with a second abutment portion (11); at least two of the bearings are limitedly located between the first abutment portion (721) and the second abutment portion (11).
2. The electric tool according to claim 1, characterized in that: The torque adjustment sleeve (70) is provided with a connected cylinder (71) and an end cover (72); the cylinder (71) is sleeved on the gear box (10); the end cover (72) is provided with a through hole for the output shaft (20) to pass through; and one end of the end cover (72) away from the cylinder (71) is bent inwardly to form the first abutment portion (721).
3. The electric tool according to claim 1, characterized in that: The electric tool further comprises a housing (60), and the torque adjustment sleeve (70) and the housing (60) are rotatably connected through the cooperation of a snap-fit protrusion and a snap-fit groove.
4. The electric tool according to claim 3, characterized in that: The torque adjustment sleeve (70) is provided with a first clamping groove (73), and the housing (60) is provided with a first clamping protrusion (61), and the first clamping protrusion (61) is clamped in the first clamping groove (73) and the two are clearance-matched.
5. The electric tool according to claim 4, characterized in that: The first locking groove (73) is arranged on the outer wall of the torque adjustment sleeve (70), and one end of the housing (60) is at least partially bent inward to form the first locking protrusion (61).
6. The electric tool according to claim 5, characterized in that: The groove wall of the first locking groove (73) extends radially outward to form a third abutment portion (731), and the first locking protrusion (61) axially abuts against the third abutment portion (731).
7. The electric tool according to any one of claims 1 to 6, characterized in that: The output shaft (20) is provided with a shaft shoulder (22), and the front end surface of the bearing abuts against the shaft shoulder (22).
8. The electric tool according to claim 7, characterized in that: The output shaft (20) comprises a shaft body (21), a shaft shoulder (22) is arranged on the shaft body (21), and a narrowing section (23) is arranged at one end of the shaft body (21) away from the tool head, and the narrowing section (23) gradually narrows in a direction away from the tool head.
9. The electric tool according to claim 8, characterized in that: The electric tool also includes a drill chuck, which includes a sleeve for clamping the drill bit; the rear end surface of the sleeve abuts against the shaft shoulder (22).
10. The electric tool according to any one of claims 1 to 6, characterized in that: The number of the bearings is two.