Clamping mechanism and electric tool
By designing a clamping mechanism that utilizes the squeezing force generated by the elastic element when the output shaft rotates, the machining disc is adaptively clamped, solving the problem of the machining disc coming loose from the power tool and achieving higher safety and convenience.
Patent Information
- Application Number
- CN202422700112.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-06
AI Technical Summary
The cutting discs of power tools are prone to loosening due to inertia during use, posing a safety hazard.
A clamping mechanism is designed, including a retainer, a support plate, and an elastic element. The support plate and the processing disc are adaptively clamped by the squeezing force generated by the elastic element when the output shaft rotates, ensuring that the processing disc does not loosen during use.
It effectively prevents the processing disc from loosening, improving the safety and ease of use of power tools.
Smart Images
Figure CN223519623U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a clamping mechanism, especially a clamping mechanism for electric tools. BACKGROUND
[0002] For electric tools with disc-shaped machining disc, such as grinding disc, circular saw blade, such as angle grinder, circular saw, its output shaft connected with machining disc rotates around its own axis under the action of motor to output power, so as to complete the machining operation of the workpiece to be processed.
[0003] Such electric tools often need to be operated suddenly during use, once the stop occurs, the output shaft will stop rotating almost immediately under the action of the brake, and the machining disc will continue to rotate under the action of inertia, this rotating trend, especially after repeated multiple frequent stop of the electric tool after long-term use, may cause the machining disc to loosen from the electric tool, thereby causing a security risk. SUMMARY
[0004] The utility model aims at providing a clamping mechanism, which can effectively ensure that the machining disc of the electric tool does not loosen during use.
[0005] In order to achieve the above purpose, the utility model provides a clamping mechanism, which is connected with the output shaft of the electric tool, and the output shaft is used to drive the machining disc of the electric tool; the clamping mechanism comprises:
[0006] A retainer is sleeved on the output shaft through the retainer inner hole, and is connected with the output shaft to make the retainer stationary relative to the output shaft;
[0007] A support plate is sleeved on the output shaft through the support plate inner hole, and has a circumferential gap between the support plate and the output shaft to enable the support plate to rotate relative to the output shaft, the support plate inner hole has a matching part capable of abutting against the output shaft at a clamping station; the machining disc is used to install on the support plate;
[0008] An elastic element is arranged between the retainer and the support plate in the axial direction;
[0009] When the support plate rotates relative to the output shaft to the clamping station, the matching part of the support plate abuts against the output shaft, so that the elastic element is subjected to radial extrusion force and elastically deformed to apply clamping force to the support plate and the retainer to make them tend to approach each other.
[0010] Further, the first plane part of the inner hole of the retainer is matched with the plane section on the outer circumferential surface of the output shaft, so that the retainer is press-fitted on the output shaft, and the retainer is arranged stationary relative to the output shaft.
[0011] Further, the matching part is arranged as a second plane part, which abuts against the plane section on the outer circumferential surface of the output shaft at the clamping station.
[0012] Further, the clamping mechanism has at least two elastic elements, which are uniformly distributed in the circumferential direction.
[0013] Further, the clamping mechanism has a containing groove arranged on the retainer, and the elastic element is arranged in the containing groove.
[0014] Further, the elastic element comprises a bent plate spring, which has at least a first side wall part and a second side wall part arranged oppositely, the first side wall part abuts against the circumferential wall of the retainer, the second side wall part abuts against the circumferential wall of the support plate, and the plate spring has a first hook part and a second hook part at two ends thereof, respectively, wherein the first hook part abuts against the axial step surface of the retainer, and the second hook part abuts against the axial step surface of the support plate.
[0015] Further, the clamping mechanism has an axial spacing between the retainer and the support plate.
[0016] Further, the axial spacing is less than or equal to 2mm.
[0017] Further, the clamping mechanism has a sealing ring between the retainer and the support plate.
[0018] Further, the clamping mechanism has an axial limiting element between the support plate and the output shaft.
[0019] Further, the clamping mechanism further comprises a damping element arranged on the retainer.
[0020] Another purpose of the utility model is to provide an electric tool which is safe and convenient to use.
[0021] In order to achieve the above purpose, the utility model provides a kind of electric tool, it includes electric tool body, the electric tool body includes processing disc piece and the output shaft of driving the processing disc piece, in addition the electric tool further includes the clamping mechanism as described above, the processing disc piece is installed on the support plate.
[0022] The clamping mechanism described in the utility model can adaptively clamp the support plate on which the processing disc piece is installed based on the change of the rotation state of the output shaft, so that the loosening of the processing disc piece during use is effectively prevented.
[0023] The electric tool described in the utility model has higher safety and convenience. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 The assembly schematic diagram of the clamping mechanism described in the utility model in one embodiment is shown.
[0025] Figure 2 The split structure schematic diagram of the clamping mechanism described in the utility model in one embodiment is shown.
[0026] Figure 3 The abutting state of the support plate and the output shaft of the electric tool in the normal starting working state is shown from the perspective of top view.
[0027] Figure 4 The abutting state of the support plate and the output shaft of the electric tool at the instant of shutdown is shown from the perspective of top view.
[0028] Figure 5 The force state of the clamping mechanism described in the utility model is schematically shown. DETAILED DESCRIPTION
[0029] The clamping mechanism and the electric tool described in the utility model will be further explained and described below in conjunction with the drawings and specific embodiments in the specification, but the explanation and description do not constitute undue limitation on the technical solutions of the utility model.
[0030] For the electric tool with disc-shaped processing disc piece, such as angle grinder, circular saw, the processing disc piece is usually installed on the support plate or mounting plate through the fastening nut, and the support plate or mounting plate is installed on the output shaft of the electric tool, so as to realize the connection of the processing disc piece and the output shaft. When the output shaft rotates around its own axis under the action of the motor, it drives the processing disc piece to rotate, so as to process the workpiece to be processed, such as grinding or cutting.
[0031] Such electric power tools often need to be suddenly stopped during use. Once stopped, the output shaft will stop rotating almost immediately under the action of the brake, while the processing disc and the support plate will continue to rotate under the action of inertia, so that the support plate and the processing disc have a tendency to rotate in the opposite direction relative to the output shaft. This rotating tendency generates friction between the processing disc and the tightening nut, and as the service life of the electric power tool increases, this frequent friction may cause the processing disc and the support plate to loosen from the electric power tool, thereby posing a safety hazard to the use of the electric power tool.
[0032] To solve the above problems, the utility model provides a clamping mechanism in an embodiment.
[0033] Figure 1 The utility model discloses a clamping mechanism in an embodiment shows the assembly schematic drawing.
[0034] Figure 2 The utility model discloses a clamping mechanism in an embodiment shows the split structure schematic drawing.
[0035] As Figure 1 And Figure 2 As shown in an embodiment, the clamping mechanism is connected with the output shaft 1 of the electric power tool, which can include:
[0036] The retainer 2 is sleeved on the output shaft 1 through the retainer inner hole 21, and is connected with the output shaft 1 to make the retainer 2 stationary relative to the output shaft 1. The support plate 3 is sleeved on the output shaft 1 through the support plate inner hole 31, and has a circumferential gap G1 between the support plate 3 and the output shaft 1 to enable the support plate 3 to rotate relative to the output shaft 1, and the support plate inner hole 31 has a matching part 311 that can abut against the output shaft 1 at the clamping station. The processing disc P is used to be installed on the support plate 3. The elastic element 4 is arranged between the retainer 2 and the support plate 3 in the axial direction.
[0037] As Figure 3 And Figure 5 As shown in an embodiment, when the electric power tool is started from the normal working state, the output shaft 1 rotates in the direction as shown in Figure 3 During this process, as long as the output shaft is not constant speed, the output shaft 1 and the support plate 3 will rotate relative to each other until the support plate rotates relative to the output shaft to the clamping station, at which time the matching part 311 of the support plate abuts against the output shaft 1, for example as Figure 3The lower part of the support plate 3 abuts against the output shaft 1, which changes the circumferential clearance between the support plate 3 and the output shaft 1. This changes the relative circumferential distance between the support plate 3 and the retainer 2 fixed to the output shaft 1, causing the elastic element 4 to undergo elastic deformation under a radial compressive force F1. This exerts a clamping force on the support plate 3 and the retainer 2, bringing them closer together. This clamping force includes both the axial clamping force F2 and the radial clamping force generated by the compressive force F1. Since the processing disc P is fixedly installed, for example, by fastening the nut 8 on the support plate 3, clamping the support plate is equivalent to clamping the processing disc.
[0038] Similarly, as Figure 4 and Figure 5 As shown, at the instant the power tool stops, the output shaft 1 rapidly decreases in speed to a standstill, while the support plate 3, due to inertia, still tends to rotate, causing the support plate 3 to rotate relative to the output shaft 1 until it reaches the clamping position. At this point, the mating part 311 of the support plate abuts against the output shaft 1, for example... Figure 4 The upper part of the plate 3 abuts against the support plate 3, which changes the circumferential clearance between the support plate 3 and the output shaft 1. This alters the relative circumferential distance between the support plate 3 and the retainer 2 fixed to the output shaft 1, causing the elastic element 4 to undergo elastic deformation under a radial compressive force F1. This force applies a clamping force to the support plate 3 and the retainer 2, bringing them closer together. This clamping force includes both the axial clamping force F2 and the radial clamping force generated by the compressive force F1. Since the processing disc P is fixedly mounted, for example, by a fastening nut 8 on the support plate 3, clamping the support plate is equivalent to clamping the processing disc.
[0039] Therefore, it can be seen that the clamping mechanism described in this utility model can clamp the support plate and the processing disc attached thereto, whether the power tool is in the starting working state or at the moment of stopping, as long as the rotation speed of the output shaft changes instead of being constant.
[0040] In some more specific embodiments, the cage 2 is press-fitted onto the output shaft 1, thereby keeping it relatively stationary with respect to the output shaft 1.
[0041] For example, in some more specific implementations, such as Figure 2 As shown, the inner hole 21 of the cage has a first flat portion 211, which is interference-fitted with the flat segment 11 on the outer circumferential surface of the output shaft so that the cage 2 is press-fitted onto the output shaft 1.
[0042] Similarly, in some more specific implementations, such as Figure 2As shown, the fitting part 311 on the support plate 3 is set as a second planar part, which abuts against the planar section 11 on the outer circumferential surface of the output shaft in the clamping station, for example as Figure 3 and Figure 4 shown.
[0043] In some more specific embodiments, as Figure 1 shown, the elastic element 4 can comprise a bent plate spring. For a single plate spring, it has at least a first side wall part 41 and a second side wall part 42 arranged oppositely, wherein the first side wall part 41 abuts against the circumferential wall 23 of the retainer 2, and the second side wall part 42 abuts against the circumferential wall 32 of the support plate 3.
[0044] In addition, the two ends of the plate spring have a first hook part 43 and a second hook part 44, respectively, wherein the first hook part 43 abuts against the axial step face 24 of the retainer 2, and the second hook part 44 abuts against the axial step face 33 of the support plate 3.
[0045] According to this arrangement, when the support plate 3 rotates relative to the output shaft 1 to the clamping station by a certain angle, as Figure 5 shown, the support plate 3 and the retainer 2 will apply a radial extrusion force F1 to the elastic element 4, which generates a radial clamping force, and at the same time, the extrusion force F1 also causes the elastic element to elastically deform to generate an axial tension, and then through the first hook part and the second hook part tending to approach each other, an axial clamping force F2 is applied to the support plate 3 and the retainer 2, so that the support plate 3 is also clamped in the axial direction.
[0046] In some specific embodiments, the elastic element 4 can be provided with at least two, for example as Figure 2 shown, which are evenly distributed in the circumferential direction. Of course, those skilled in the art know that in other embodiments, based on the demand for clamping force and in order to make the clamping force more stable, the elastic element 4 can also be provided with three, four, five or six, or other required number.
[0047] In some more specific embodiments, the elastic element can be arranged in the accommodation groove 22 of the retainer 2. In these embodiments, the accommodation groove has a relatively independent space, so as to provide protection and stable support for the elastic element. Those skilled in the art can know that the number of accommodation grooves can correspond to the number of elastic elements.
[0048] Preferably, as Figure 1As shown, in some embodiments, there is an axial spacing G2 between the retainer 2 and the support plate 3 in the assembled state. In such embodiments, adjusting the axial spacing G2 between the retainer 2 and the support plate 3 can limit the maximum pressure of the elastic element 4 after compression, so that the disassembly force of the support plate is adjustable, making the disassembly process of the support plate easier, providing convenience and comfort in use.
[0049] In some more specific embodiments, considering the convenience of disassembly and the stability of the entire device, the axial spacing G2 can be controlled to be ≤ 2 mm. In a specific example, based on the need for the size of the disassembly force, it can be 0.5 mm, or 1 mm.
[0050] In addition, as shown in Figure 1 and Figure 2 In some embodiments, in order to further improve the dustproof effect, a sealing ring 5 can also be provided between the retainer 2 and the support plate 3.
[0051] In addition, in some embodiments, as shown in Figure 1 and Figure 2 An axial limiting element 6 can also be provided between the support plate 3 and the output shaft 1. When the clamping mechanism described in the utility model is press-fitted and installed on the output shaft 1, the axial limiting element 6 can axially limit the support plate 3, thereby further preventing the support plate from falling off in an extreme state.
[0052] In some more specific embodiments, the axial limiting element can be an elastic retaining ring.
[0053] Of course, in some other more specific embodiments, other axial limiting elements can also be used, such as a limiting pin inserted into a limiting hole.
[0054] In addition, as shown in Figure 2 In some embodiments, the clamping mechanism described in the utility model can also include a shock-absorbing damping element 7, which can be provided on the retainer 2.
[0055] In some more specific embodiments, the shock-absorbing damping element 7 can include a damping housing 71 and a damping material (not shown in the figure) filled in the damping housing 71, such as a fluid, sand or other similar damping materials. Figure 2
[0056] In addition, in some embodiments, after the shock-absorbing damping element is placed in the groove on the retainer, a sealing end cover (not shown in the figure) can also be installed. Of course, in some other embodiments, even if the shock-absorbing damping element is not provided, a sealing end cover can also be provided on the groove of the retainer.
[0057] In addition, in some embodiments, the upper end surface of the cage in the axial direction can be provided with a dustproof sealing element (not shown). Figure 1 The upper end surface of the cage in the axial direction can be provided with a dustproof sealing element (not shown).
[0058] Based on the clamping structure, the utility model provides an electric tool, it includes electric tool body and above-mentioned clamping mechanism, electric tool body includes processing disc piece P and drive processing disc piece P's output shaft 1, processing disc piece P is installed on the support plate 3 of clamping mechanism.
[0059] In some embodiments, the processing disc piece can be a disc-shaped processing tool, such as a grinding disc piece or a circular saw blade.
[0060] In some embodiments, the electric tool can be, for example, an angle grinder or a circular saw. When the output shaft rotates around its own axis under the action of the motor, it drives the processing disc piece to rotate, thereby performing a processing operation, such as a grinding operation or a cutting operation, on the workpiece to be processed.
[0061] Since the utility model does not improve other components of the electric tool, detailed description is not given here.
[0062] The clamping mechanism can adaptively clamp the support plate on which the processing disc piece is installed based on the change in the rotation state of the output shaft, thereby effectively preventing the processing disc piece from loosening during use. Therefore, the electric tool with the clamping mechanism has higher safety and use convenience.
[0063] It should be noted that the prior art part in the protection scope of the utility model is not limited to the embodiments given in the utility model document. All prior art, including but not limited to prior patent documents, prior published publications, prior public use, etc., that are not contradictory to the scheme of the utility model can be included in the protection scope of the utility model.
[0064] In addition, the combination manner of the technical features in the case is not limited to the combination manner recorded in the claims of the case or the combination manner recorded in the specific embodiments. All technical features recorded in the case can be freely combined or integrated in any manner, unless contradictory to each other.
[0065] It should be noted that the above-mentioned embodiments are only specific embodiments of the utility model. Obviously, the utility model is not limited to the above-mentioned embodiments. Similar changes or modifications that can be directly derived or easily conceived by those skilled in the art from the disclosure of the utility model should be included in the protection scope of the utility model.
Claims
1. A clamping mechanism which is connected to an output shaft (1) of a power tool, said output shaft being used to drive a machining disc (P) of the power tool, characterized in that, The clamping mechanism comprises: a retainer (2) which is sleeved on the output shaft through a retainer inner hole (21) and is connected with the output shaft to set the retainer stationary relative to the output shaft; a support plate (3) which is sleeved on the output shaft through a support plate inner hole (31) and has a circumferential gap (G1) between the support plate and the output shaft to enable the support plate to rotate relative to the output shaft, the support plate inner hole having a matching portion (311) which can abut against the output shaft at a clamping station; the machining disc is used to be mounted on the support plate; a resilient element (4) which is arranged between the retainer and the support plate in an axial direction; wherein when the support plate is rotated relative to the output shaft to the clamping station, the matching portion (311) of the support plate abuts against the output shaft (1) to make the resilient element elastically deformed under a radial pressing force to apply a clamping force to the support plate and the retainer to make them tend to approach each other.
2. The clamping mechanism of claim 1, wherein, The retainer inner hole has a first planar portion (211) which matches a planar section (11) on the outer circumferential surface of the output shaft to press-fit the retainer on the output shaft to set the retainer stationary relative to the output shaft.
3. The clamping mechanism of claim 1, wherein, The matching portion (311) is arranged as a second planar portion which abuts against the planar section (11) on the outer circumferential surface of the output shaft at the clamping station.
4. The clamping mechanism of claim 1, wherein, The resilient element (4) is provided with at least two resilient elements which are uniformly distributed in a circumferential direction.
5. The clamping mechanism of claim 1, wherein, The retainer is provided with a receiving groove (22) in which the resilient element is arranged.
6. The clamping mechanism of claim 1, wherein, The resilient element comprises a bent plate spring which has at least a first side wall portion (41) and a second side wall portion (42) arranged opposite to each other, the first side wall portion abutting against a circumferential wall (23) of the retainer, the second side wall portion abutting against a circumferential wall (32) of the support plate, both ends of the plate spring having a first hook-shaped portion (43) and a second hook-shaped portion (44) respectively, wherein the first hook-shaped portion abuts against an axial stepped surface (24) of the retainer, and the second hook-shaped portion abuts against an axial stepped surface (33) of the support plate.
7. The clamping mechanism of claim 1, wherein The retainer and the support plate have an axial spacing (G2) therebetween.
8. The clamping mechanism of claim 7, wherein, The axial spacing (G2) is ≤2mm.
9. The clamping mechanism of claim 1, wherein, The retainer and the support plate have a sealing ring (5) therebetween.
10. The clamping mechanism of claim 1, wherein, The support plate and the output shaft are provided with an axial limiting element (6) therebetween.
11. The clamping mechanism of claim 1, wherein, The electric tool further comprises the clamping mechanism as claimed in any one of claims 1-11, and the machining disc is mounted on the support plate (3).
12. A power tool comprising a power tool body comprising a machining disc (P) and an output shaft (1) driving the machining disc, characterized in that, The electric tool further comprises the clamping mechanism as claimed in any one of claims 1-11, and the machining disc is mounted on the support plate (3).