Power tool

Abstract

This utility model provides an electric tool, including a housing, a motor assembly, a transmission assembly, and a tool holder assembly. The motor assembly and transmission assembly are disposed within the housing, and the input end of the transmission assembly is connected to a motor shaft. The tool holder assembly has a tool holder connected to the output end of the transmission assembly. A guide and a limiting member are disposed at the end of the tool holder away from the transmission assembly. A support member is disposed between the limiting member and the guide member, and the limiting member restricts the movement of the guide member and the support member. This utility model's electric tool uses the limiting member to restrict the guide member and the support member disposed on the tool holder. When the thickness of the guide member is small, a larger number of support members are installed between the guide member and the limiting member; when the thickness of the guide member is large, a smaller number of support members are installed between the guide member and the limiting member. Thus, the limiting member can be adapted to different types of guide members to meet different chamfering operation requirements.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] During the manufacturing process of metal workpieces, numerous burrs are often left at the edges and corners of the workpieces or the edges of holes. Various handheld chamfering machines are commonly used to chamfer and deburr these workpieces, resulting in smoother edges. A chamfering machine has a motor-driven tool holder, on which are mounted chamfering blades and guides. As the chamfering machine moves along the edge of the workpiece, the guides roll along that edge, thus improving the chamfering efficiency. To meet different chamfering requirements, the guides of the chamfering machine are often replaced for different workpieces; however, existing chamfering machines suffer from the problem of cumbersome guide replacement. Utility Model Content

[0003] The purpose of this utility model is to provide an electric tool that solves the problem of the cumbersome replacement of guide components in existing electric tools.

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising:

[0005] case;

[0006] A motor assembly, wherein the motor assembly is disposed within the housing, and the motor assembly has a motor shaft;

[0007] A transmission assembly is disposed within the housing, and the input end of the transmission assembly is connected to the motor shaft;

[0008] A tool holder assembly has a tool holder connected to the output end of the transmission assembly and a cutting blade mounted on the tool holder. A guide and a limiting member are provided at the end of the cutting blade away from the transmission assembly. A support member is provided between the guide and the limiting member, and the limiting member restricts the movement of the guide and the support member.

[0009] Preferably, the support is a gasket, which is sleeved on the tool holder.

[0010] Preferably, the limiting member is a retaining ring, and the retaining ring is clamped on the tool holder.

[0011] Preferably, the tool holder is provided with a mounting ring groove, and the retaining ring is provided at the mounting ring groove.

[0012] Preferably, the guide element is a rolling bearing.

[0013] Preferably, the tool holder is provided with a shoulder stop surface facing the limiting member, and the shoulder stop surface abuts against the side of the guide member away from the limiting member.

[0014] Preferably, the blade has a cutting edge portion for operation, the cutting edge portion having a connected straight edge and a curved edge, the end of the curved edge near the guide member and the straight edge of the cutting edge forming an intersection point, the intersection point being located on the side of the guide member away from the central axis of the blade holder.

[0015] Preferably, the tool holder includes a tool holder shaft, a tool head mounting portion, and an end shaft connected in sequence. The end of the tool holder shaft away from the tool head mounting portion is connected to the output end of the transmission assembly. The radial dimension of the tool holder shaft and the radial dimension of the end shaft are both smaller than the radial dimension of the tool head mounting portion.

[0016] The guide, the limiting member, and the support member are disposed on the end shaft, the blade is disposed on the blade head mounting portion, the blade head mounting portion is provided with a receiving groove for accommodating the blade, and the blade extends at least partially out of the receiving groove to form the cutting edge portion of the blade.

[0017] Preferably, the bottom wall of the receiving groove is provided with a blade mounting groove adapted to the shape of the blade, and the blade is at least partially disposed in the blade mounting groove.

[0018] Preferably, the blade has a tip at one end away from the cutting edge, and the sidewall of the blade mounting groove has a retaining groove that engages with the tip.

[0019] Preferably, the housing comprises:

[0020] A first sleeve is fitted onto the end of the cutter head mounting portion that is away from the end shaft.

[0021] The second sleeve is sleeved outside the first sleeve. The second sleeve has a support surface at one end near the end shaft. The cutter head mounting part is at one end near the end shaft, and the end shaft extends out of the second sleeve.

[0022] The second sleeve is adjustable relative to the first sleeve, allowing it to move along the axial direction of the tool holder.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The power tool of this invention uses a limiting component to limit the guide and support components set on the tool holder. When the thickness of the guide is small, a large number of support components are installed between the guide and the limiting component; when the thickness of the guide is large, a small number of support components are installed between the guide and the limiting component. In this way, the limiting component can be adapted to different models of guide components to meet different chamfering operation requirements, and also makes it easier to replace the guide components of the power tool. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 This is a schematic diagram of the structure of the power tool in the embodiment of this utility model;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure of a power tool after the guide component has been removed;

[0028] Figure 3 for Figure 1 A cross-sectional view of a power tool after the guide component has been removed;

[0029] Figure 4 for Figure 1 A structural schematic diagram of the middle tool holder assembly;

[0030] Figure 5 for Figure 4 Exploded view of the guide component;

[0031] Figure 6 for Figure 4 Schematic diagram of the structure at the middle tool holder;

[0032] Figure 7 for Figure 6 A schematic diagram of the middle tool holder.

[0033] Explanation of reference numerals in the accompanying drawings of this utility model:

[0034] Power tool 100, housing 1, first sleeve 11, second sleeve 12, support surface 13, motor assembly 2, motor shaft 21, transmission assembly 3, tool holder assembly 4, tool holder 41, tool holder shaft 411, tool head mounting part 412, end shaft 413, mounting ring groove 42, shaft shoulder stop surface 43, receiving groove 44, blade mounting groove 45, slot 46, blade 5, cutting edge 51, straight edge of cutting edge 511, curved edge of cutting edge 512, intersection point 513, blade tip 52, guide 6, limiting part 7, support 8.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] This utility model provides a power tool, which can be an angle grinder or a chamfering machine, etc. The following description will use a chamfering machine as an example. Figures 1 to 7 A preferred embodiment of the power tool provided by this utility model is shown.

[0040] Please see Figures 1 to 4In this embodiment, the power tool 100 includes a housing 1, a motor assembly 2, a transmission assembly 3, and a tool holder assembly 4. The motor assembly 2 is disposed inside the housing 1 and has a motor shaft 21. The transmission assembly 3 is disposed inside the housing 1, and its input end is connected to the motor shaft 21. The tool holder assembly 4 has a tool holder 41 connected to the output end of the transmission assembly 3. Along the axial direction of the tool holder 41, a blade 5, a guide 6, and a limiting member 7 are sequentially arranged at the end of the tool holder 41 away from the transmission assembly 3. The guide 6 is located on the side of the blade 5 away from the transmission assembly 3. The limiting member 7 is detachably disposed on the tool holder 41. A support member 8 is abutted between the limiting member 7 and the guide 6. The limiting member 7 restricts the movement of the guide 6 and the support member 8 in the axial direction of the tool holder 41.

[0041] Specifically, the blade 5 can be fixed to the tool holder 41 by means of screws or clamps. A transmission component 3 is provided between the tool holder 41 and the motor shaft 21 of the motor assembly 2 to transmit power. Thus, when the motor assembly 2 is running, the motor shaft 21 of the motor assembly 2 rotates, and the motor shaft 21 drives the tool holder 41 to rotate via the transmission component 3, allowing the blade 5 on the tool holder 41 to chamfer the workpiece. The tool holder 41 and the motor shaft 21 can be coaxial or approximately coaxial; the tool holder 41 and the motor shaft 21 can also be perpendicular or approximately perpendicular. Optionally, please refer to... Figures 1 to 3 In this embodiment, the tool holder 41 is arranged perpendicularly to the motor shaft 21. The axial direction of the tool holder 41 is defined as vertical, and the end of the tool holder 41 closer to the transmission assembly 3 is the upper end of the tool holder 41, while the end of the tool holder 41 farther from the transmission assembly 3 is the lower end of the tool holder 41.

[0042] The upper end of the tool holder 41 is located inside the housing 1 and connected to the transmission assembly 3, thus enabling the tool holder 41 to rotate along the vertical axis via the transmission assembly 3. The lower end of the tool holder 41 extends downwards outside the housing 1. From top to bottom, the lower end of the tool holder 41 is provided with a blade 5, a guide 6, a support 8, and a limiting member 7. At least a portion of the blade 5 is located outside the housing 1, allowing the blade 5 to cut along the edge of the workpiece. The guide 6, support 8, and limiting member 7 are all detachably mounted on the lower end of the tool holder 41. The guide 6 can roll relative to the tool holder 41 along the vertical axis. Thus, when the blade 5 moves along the edge of the workpiece for chamfering, the guide 6 will contact the edge of the workpiece, and the guide 6 can roll along the edge of the workpiece, thereby improving the chamfering efficiency of the power tool 100.

[0043] One or more support members 8 abut against the lower side of the guide member 6 in sequence, while the limiting member 7 abuts against the lower side of all the support members 8. In this way, the limiting member 7 can limit the guide member 6 and the support members 8 set on the tool holder 41. When it is necessary to replace the guide member 6 with a different model, first remove the limiting member 7, the support members 8 and the old model guide member 6 in sequence from the lower end of the tool holder 41. Then, according to the difference between the thickness of the new model guide member 6 (the thickness of the guide member 6 is the dimension of the guide member 6 in the axial direction of the tool holder 41) and the thickness of the old model guide member 6, increase or decrease the number of support members 8. Then, install the new model guide member 6, the increased or decreased number of support members 8 and the limiting member 7 in sequence at the lower end of the tool holder 41, thereby completing the replacement of the guide member 6. In this way, the replacement of the guide member 6 of the power tool 100 is relatively easy.

[0044] The power tool 100 of this utility model uses a limiting member 7 to limit the guide member 6 and the support member 8 set on the tool holder 41. When the thickness of the guide member 6 is small, the number of support members 8 installed between the guide member 6 and the limiting member 7 is large; when the thickness of the guide member 6 is large, the number of support members 8 installed between the guide member 6 and the limiting member 7 is small. In this way, the limiting member 7 can be adapted to different models of guide members 6 to meet different chamfering operation requirements, and also makes it easier to replace the guide member 6 of the power tool 100.

[0045] The specific configuration of guide component 6 can be set according to actual conditions. For example, guide component 6 can be a roller or a bearing. Optionally, please refer to [link to relevant documentation]. Figures 4 to 6 In this embodiment, the guide 6 is a rolling bearing. The arrangement of this guide 6 is relatively simple. The following will take the example of the guide 6 being a rolling bearing.

[0046] Optionally, please refer to Figures 4 to 6 In this embodiment, the tool holder 41 is provided with a shoulder stop surface 43 facing the limiting member 7, and the shoulder stop surface 43 abuts against the side of the guide member 6 away from the limiting member 7.

[0047] Specifically, a downward-facing shoulder stop surface 43 is provided on the lower circumferential side of the tool holder 41. The shoulder stop surface 43 is arranged in a ring extending along the circumference of the tool holder 41 and is located on the upper side of the guide member 6. The shoulder stop surface 43 abuts against the upper side of the guide member 6. In this way, the guide member 6 can be installed and positioned on the tool holder 41 through the shoulder stop surface 43.

[0048] When the thickness of the guide member 6 is small, a larger number of support members 8 are installed between the guide member 6 and the limiting member 7; when the thickness of the guide member 6 is large, a smaller number of support members 8 are installed between the guide member 6 and the limiting member 7. The specific arrangement of the support members 8 can be set according to the actual situation. For example, the support member 8 can be a gasket or a sleeve. Optionally, please refer to [link to relevant documentation]. Figure 1 , Figures 4 to 6 In this embodiment, the support member 8 is a gasket, which is sleeved on the tool holder 41.

[0049] Specifically, the support member 8 and the lower end of the tool holder 41 are fitted with a clearance fit so that the support member 8 can be fitted onto the lower end of the tool holder 41. This method of setting the support member 8 is relatively simple, and the installation of the support member 8 is also relatively convenient. The following will take the support member 8 as a gasket 8 as an example for introduction.

[0050] Similarly, the specific configuration of the limiting component 7 can be set according to the actual situation. For example, the limiting component 7 can be a retaining ring, a nut, or a pin. Optionally, please refer to [link to relevant documentation]. Figure 1 , Figures 4 to 6 In this embodiment, the limiting member 7 is a retaining ring, which is mounted on the tool holder 41.

[0051] Specifically, the limiting member 7 is fixed to the lower end of the tool holder 41 by means of a clamp. This setting method of the limiting member 7 is relatively simple, and the installation of the limiting member 7 is also relatively convenient. The following will take the retaining ring 7 as an example to introduce the limiting member 7.

[0052] Optionally, please refer to Figure 4 , Figure 6 and Figure 7 In this embodiment, the tool holder 41 is provided with an mounting ring groove 42, and the retaining ring 7 is clamped at the mounting ring groove 42.

[0053] Specifically, a ring-shaped mounting groove 42 extending circumferentially along the lower end of the tool holder 41 is provided on the peripheral side surface. The retaining ring 7 is clamped in the mounting groove 42 of the tool holder 41, and the part of the retaining ring 7 outside the mounting groove 42 is used to abut against the support member 8. In this way, the mounting groove 42 can realize the mounting and positioning of the retaining ring 7 on the tool holder 41.

[0054] The lower end of the tool holder 41 is typically provided with a plurality of blades 5 along the circumference of the tool holder 41. Optionally, please refer to Figure 1 , Figure 4 and Figure 5 In this embodiment, the blade 5 has a cutting edge 51 for operation. The cutting edge 51 has a connected straight edge 511 and a curved edge 512. The end of the curved edge 512 near the rolling bearing 6 and the straight edge 511 form an intersection point 513. The intersection point 513 is located on the side of the rolling bearing 6 away from the central axis of the tool holder 41.

[0055] Specifically, the portion of the blade 5 that protrudes laterally from the tool holder 41 forms a cutting edge 51. The edge of the cutting edge 51 away from the center of the blade 5 includes a connected straight cutting edge 511 and a curved cutting edge 512. The blade 5 cuts the edge of the workpiece through the curved cutting edge 512. The lower end of the curved cutting edge 512 and the straight cutting edge 511 form an intersection point 513, which is located on the side of the guide member 6 away from the central axis of the tool holder 41. This avoids interference between the rolling bearing 6 and the blade 5 cutting the workpiece.

[0056] Optionally, please refer to Figures 4 to 6 In this embodiment, the tool holder 41 includes a tool holder shaft 411, a tool head mounting part 412, and an end shaft 413 connected in sequence. The end of the tool holder shaft 411 away from the tool head mounting part 412 is connected to the output end of the transmission assembly 3. The radial dimension of the tool holder shaft 411 and the radial dimension of the end shaft 413 are both smaller than the radial dimension of the tool head mounting part 412. The rolling bearing 6, the retaining ring 7, and the washer 8 are disposed on the end shaft 413. The blade 5 is disposed on the tool head mounting part 412. The tool head mounting part 412 is provided with a receiving groove 44 for accommodating the blade 5. A portion of the blade 5 extends out of the receiving groove 44 to form the cutting edge 51 of the blade 5.

[0057] Specifically, the tool holder 41 includes a tool holder shaft 411, a tool head mounting portion 412, and an end shaft 413 connected sequentially from top to bottom. The tool holder shaft 411 is located inside the housing 1, and its upper end is connected to the transmission assembly 3. The upper end of the tool head mounting portion 412 is located inside the housing 1, while its lower end and the end shaft 413 extend outside the housing 1. The diameter of the tool head mounting portion 412 is larger than the diameter of the tool holder shaft 411 and the diameter of the end shaft 413, and the diameter of the lower end of the tool head mounting portion 412 can gradually decrease from top to bottom. A receiving groove 44 is provided on the peripheral side of the tool head mounting portion 412. A portion of the blade 5 is located inside the receiving groove 44, and the remaining portion of the blade 5 extends laterally outside the receiving groove 44 to form a cutting edge 51. This method of housing the blade 5 through the receiving groove 44 helps to avoid interference between the blade 5 and other components.

[0058] Optionally, please refer to Figure 6 and Figure 7 In this embodiment, the bottom wall of the receiving groove 44 is provided with a blade mounting groove 45 that is adapted to the shape of the blade 5, and part of the blade 5 is disposed in the blade mounting groove 45.

[0059] Specifically, a blade mounting groove 45 is provided on the bottom wall of the receiving groove 44. The shape of the blade mounting groove 45 is adapted to the shape of the portion of the blade 5 located within the receiving groove 44, so that the portion of the blade 5 located within the receiving groove 44 can be embedded in the blade mounting groove 45. Thus, by providing a blade mounting groove 45 on the bottom wall of the receiving groove 44, the blade 5 can be installed and positioned within the receiving groove 44. The specific shape of the blade 5 can be set according to the actual situation. For example, the blade 5 can be square or triangular. The following description will take a square blade as an example.

[0060] Optionally, please refer to Figure 6 and Figure 7 In this embodiment, the blade 5 is provided with a tip 52 at the end away from the cutting edge 51, and a slot 46 is provided on the side wall of the blade mounting groove 45, which forms a snap-fit ​​engagement with the tip 52.

[0061] Specifically, the blade 5 has multiple cutting edges 52, and the portion of the blade 5 located within the receiving groove 44 (i.e., the end of the blade 5 furthest from the cutting edge 51) has two cutting edges 52. The sidewall of the blade mounting groove 45 has two retaining grooves 46 corresponding to the two cutting edges 52 within the receiving groove 44. These two retaining grooves 46 connect to the blade mounting groove 45 and penetrate the bottom wall of the receiving groove 44. The two cutting edges 52 engage with the two retaining grooves 46 respectively, thus restricting the rotation of the blade 5 when it is cutting the workpiece.

[0062] Optionally, please refer to Figures 1 to 3 In this embodiment, the housing 1 includes a first sleeve 11 and a second sleeve 12. The first sleeve 11 is sleeved on the end of the cutter head mounting portion 412 away from the end shaft 413. The second sleeve 12 is sleeved on the first sleeve 11. The end of the second sleeve 12 near the end shaft 413 is provided with a support surface 13. The end of the cutter head mounting portion 412 near the end shaft 413 and the end shaft 413 extend out of the second sleeve 12. The second sleeve 12 is adjustable relative to the first sleeve 11 and can move along the axial direction of the cutter holder 41.

[0063] Specifically, both the first sleeve 11 and the second sleeve 12 are cylindrical in shape, extending vertically. The lower end of the first sleeve 11 is fitted over the upper end of the cutter head mounting part 412, and the upper end of the second sleeve 12 is fitted over the lower end of the first sleeve 11. The lower end of the second sleeve 12 is provided with a support surface 13 extending radially along the second sleeve 12. The support surface 13 can provide vertical support and positioning for the workpiece when the blade 5 is cutting it. The upper end of the second sleeve 12 is fitted over the lower end of the first sleeve 11, and a threaded connection structure or a snap-fit ​​connection structure is provided between the second sleeve 12 and the first sleeve 11, allowing the second sleeve 12 to be adjusted vertically relative to the first sleeve 11. In this way, the user can control the axial position and chamfer depth of the blade 5 by adjusting the second sleeve 12 vertically.

[0064] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A power tool characterized by comprising: include: case; A motor assembly, wherein the motor assembly is disposed within the housing, and the motor assembly has a motor shaft; A transmission assembly is disposed within the housing, and the input end of the transmission assembly is connected to the motor shaft; A tool holder assembly has a tool holder connected to the output end of the transmission assembly and a cutting blade mounted on the tool holder. A guide and a limiting member are provided at the end of the cutting blade away from the transmission assembly. A support member is provided between the guide and the limiting member, and the limiting member restricts the movement of the guide and the support member.

2. The power tool as described in claim 1, characterized in that, The support is a gasket, which is fitted onto the tool holder.

3. The power tool as described in claim 1, characterized in that, The limiting component is a retaining ring, which is mounted on the tool holder.

4. The power tool as described in claim 3, characterized in that, The tool holder is provided with a mounting ring groove, and the retaining ring is provided at the mounting ring groove.

5. The power tool as described in claim 1, characterized in that, The guide element is a rolling bearing; and / or, The tool holder is provided with a shoulder stop surface facing the limiting member, and the shoulder stop surface abuts against the side of the guide member away from the limiting member.

6. The power tool as claimed in claim 1, characterized in that, The blade has a cutting edge for operation, the cutting edge having a connected straight edge and a curved edge, the curved edge near the guide forming an intersection point with the straight edge, the intersection point being located on the side of the guide away from the central axis of the blade holder.

7. The power tool as described in claim 6, characterized in that, The tool holder includes a tool holder shaft, a tool head mounting part, and an end shaft connected in sequence. The end of the tool holder shaft away from the tool head mounting part is connected to the output end of the transmission assembly. The radial dimension of the tool holder shaft and the radial dimension of the end shaft are both smaller than the radial dimension of the tool head mounting part. The guide, the limiting member, and the support member are disposed on the end shaft, the blade is disposed on the blade head mounting portion, the blade head mounting portion is provided with a receiving groove for accommodating the blade, and the blade extends at least partially out of the receiving groove to form the cutting edge portion of the blade.

8. The power tool as claimed in claim 7, characterized in that, The bottom wall of the receiving groove is provided with a blade mounting groove adapted to the shape of the blade, and the blade is at least partially disposed in the blade mounting groove.

9. The power tool as claimed in claim 8, characterized in that, The blade has a tip at one end away from the cutting edge, and a slot is provided on the side wall of the blade mounting groove, which engages with the tip.

10. The power tool as claimed in claim 7, characterized in that, The housing includes: A first sleeve is fitted onto the end of the cutter head mounting portion that is away from the end shaft. The second sleeve is sleeved outside the first sleeve. The second sleeve has a support surface at one end near the end shaft. The cutter head mounting part is at one end near the end shaft, and the end shaft extends out of the second sleeve. The second sleeve is adjustable relative to the first sleeve, allowing it to move along the axial direction of the tool holder.

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