A vibration damping mechanism and power tool

Abstract

This invention discloses a vibration damping mechanism for supporting the action actuator of a power tool. The vibration damping mechanism includes: a support flange (1) whose axial direction is the same as the action direction of the action actuator, the support flange having a first flange (11) and a second flange (12); a guide post (2) whose two ends are respectively connected to the first flange and the second flange of the support flange; a mass block (3) which is floatingly sleeved on the guide post, the mass block having a first end (31) and a second end (32) oppositely arranged in the axial direction of the support flange; a first spring (4) which is sleeved on the guide post and is abutting between the first flange of the support flange and the first end of the mass block; and a second spring (5) which is sleeved on the guide post and is abutting between the second flange of the support flange and the second end of the mass block.

Description

Technical Field

[0001] This invention relates to a vibration damping structure, and more particularly to a vibration damping structure for power tools. Background Technology

[0002] An electric hammer is a common power tool that uses an electric motor as a power source to drive the actuator to perform linear reciprocating motion along the axial direction.

[0003] Lightweight electric hammers typically refer to handheld electric hammers weighing around 1-4 kg. Their relatively light weight makes them easy for operators to hold and use for extended periods. Meanwhile, their power is generally around 500W-1000W, providing sufficient impact force and rotation speed, thus meeting the needs of most small-scale projects.

[0004] However, under high-frequency, high-impact working conditions, electric hammers generate strong vibrations, which can affect the user's operating comfort and stability, and may also cause injury to the user's arms and body. Therefore, it is necessary to install vibration damping devices. Dynamic vibration absorbers can effectively reduce the vibrations generated by electric hammers during operation by absorbing and dispersing vibrations.

[0005] However, due to the limited internal space of electric hammers, current power vibration damping devices cannot be well applied to lightweight electric hammers. Summary of the Invention

[0006] One of the objectives of this invention is to provide a vibration damping mechanism that occupies little space, can be reasonably arranged inside a power tool, and effectively absorbs the vibrations generated by the power tool.

[0007] To achieve the above objectives, the present invention provides a vibration damping mechanism for supporting the action mechanism of a power tool, the vibration damping mechanism comprising:

[0008] A support flange, the axial direction of which is the same as the direction of motion of the actuator, the support flange having a first flange and a second flange;

[0009] The guide column is connected at both ends to the first flange and the second flange of the support flange, respectively;

[0010] A mass block, which is floatingly fitted on the guide post, has a first end and a second end that are oppositely disposed in the axial direction of the support flange;

[0011] A first spring is sleeved on the guide post and is abutting between the first flange of the support flange and the first end of the mass block;

[0012] The second spring is sleeved on the guide post and is abutted between the second flange of the support flange and the second end of the mass block.

[0013] Another object of the present invention is to provide a power tool, especially a handheld power tool, which has excellent vibration reduction effect.

[0014] Based on the above-mentioned objectives, the present invention also provides an electric tool having the vibration damping mechanism described above.

[0015] The vibration damping mechanism described in this invention has a compact structure and occupies little space. While providing stable support for the actuator of power tools, it also has excellent vibration damping effect.

[0016] Furthermore, the vibration damping mechanism described in this invention is easy to assemble and accurately positioned during the assembly process. Therefore, its components, such as the mass block, the first elastic element, and the second spring, can be easily selected and matched based on various vibration damping requirements, making it widely applicable to various vibration damping conditions. Attached Figure Description

[0017] Figure 1 A power tool having the vibration damping mechanism described in this invention is schematically shown.

[0018] Figure 2 A schematic diagram of the vibration damping mechanism described in this invention is shown in one embodiment.

[0019] Figure 3 A partial top view of the vibration damping mechanism described in this invention is shown.

[0020] Figure 4 Showing Figure 3 Sectional view at point AA.

[0021] Figure 5 A portion was enlarged and displayed. Figure 4 The structure in.

[0022] Figure 6 A schematic diagram of another embodiment of the vibration damping mechanism described in this invention is shown.

[0023] Figure 7 A top view of another embodiment of the vibration damping mechanism described in this invention is shown.

[0024] Figure 8 Showing Figure 7 Sectional view at point BB.

[0025] Figure 9 A schematic diagram of the vibration damping mechanism described in this invention is shown in another embodiment. Detailed Implementation

[0026] The vibration damping mechanism and power tool described in this invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, this explanation and description do not constitute an undue limitation on the technical solution of this invention.

[0027] Power tools often generate vibrations during operation. For example, when the motor of an electric hammer drives its actuator to perform linear reciprocating motion along the axial direction, strong vibrations are generated under high-frequency, high-impact working conditions and the motion state of its own reciprocating mechanism. This can affect the user's operating comfort and stability, and may also cause injury to the user's arms and body.

[0028] For example, lightweight handheld electric hammers are difficult to install in terms of vibration damping mechanisms, especially in the internal space, due to their small size.

[0029] To address the aforementioned technical problems, the present invention provides, in one embodiment, a vibration damping mechanism for power tools, particularly handheld power tools with efficient internal space.

[0030] Figure 1 A compact power tool P is shown, such as a lightweight handheld electric hammer.

[0031] like Figure 1 As shown, the vibration damping mechanism 100 of the present invention is disposed within the housing 300 of the power tool, or within a portion of the housing (e.g., within the gearbox), and is supportedly disposed behind the actuation mechanism 200 of the power tool (i.e., Figure 1 The left side of the actuator provides axial support for the actuator 200 while effectively absorbing the vibration generated by the actuator 200's linear reciprocating motion along the axial direction.

[0032] Figure 2 A schematic diagram of the vibration damping mechanism described in this invention is shown in one embodiment.

[0033] like Figure 2As shown, in some embodiments, the vibration damping mechanism includes: a support flange 1, whose axial direction L is the same as the direction of operation of the actuator of the power tool. The support flange 1 has a first flange 11 and a second flange 12. The two ends of the guide post 2 are respectively connected to the first flange 11 and the second flange 12 of the support flange 1. A mass block 3 is floatingly sleeved on the guide post 2, and the mass block 3 has a first end 31 and a second end 32 disposed opposite to each other in the axial direction L of the support flange. A first spring 4 is sleeved on the guide post 2 and is disposed abutting between the first flange 11 of the support flange 1 and the first end 31 of the mass block 3. A second spring 5 is also sleeved on the guide post 2 and is disposed abutting between the second flange 12 of the support flange 1 and the second end 32 of the mass block.

[0034] In this manner, when the actuator 200 of the power tool vibrates during linear reciprocating motion along the axial direction L, the natural frequencies of the mass block 3 and the first and second springs of the damping mechanism 100 are close to or equal to the motion frequency of the actuator, thus absorbing the vibration through resonance. The first spring 4 and the second spring 5 absorb and buffer the vibration. Furthermore, the first and second springs transmit the vibration of the actuator to the mass block 3 in two opposite directions along the axial direction, causing it to float along the guide post 2, thus providing vibration damping.

[0035] In this invention, the mass block 3, the first spring 4, and the second spring 5, which play a role in vibration reduction, are reasonably arranged on the support flange, thereby integrating the support structure and the vibration reduction structure together and greatly reducing the space occupied by them inside the power tool.

[0036] In some implementations, such as Figure 2 As shown, the support flange 1 also has a motor support end face 13 perpendicular to the first flange 11 and the second flange 12. The motor support end face 13 is used to support the power source of the power tool, the motor (or motor). Therefore, this structure allows the motor and the action execution mechanism to be set basically perpendicular to each other, thereby making the internal structure of the power tool more compact and further improving the space-saving effect.

[0037] Of course, in some other embodiments, the motor support end face can also be arranged parallel to the first flange and the second flange. In this arrangement, the motor output shaft is also arranged substantially parallel to the actuator.

[0038] In some more specific embodiments, the mass block can be made by sintering and can be made of metal, ceramic, composite material or other material that can achieve counterweight and damping effects.

[0039] In some more specific embodiments, the first spring 4 and the second spring 5 may be configured as helical compression springs. Furthermore, in other more specific embodiments, the first spring 4 and the second spring 5 may also be configured as other torsion springs, bending springs, tension springs, and / or gas springs that can achieve the objectives of the present invention.

[0040] In this invention, the stiffness and elastic coefficient of the spring can be selected and adjusted according to the specific requirements of vibration reduction to adjust the natural frequency of the mass spring system (including the mass block, the first spring and the second spring).

[0041] like Figure 2 As shown, in some more specific embodiments, for further optimization of the arrangement, the mass block 3 may be arc-shaped and extend in the circumferential direction of the supporting flange.

[0042] In this invention, the weight and volume of the mass block can be selected according to the specific needs of vibration reduction to adjust the natural frequency of the mass spring system (including the mass block, the first spring, and the second spring).

[0043] In some more specific embodiments, at least two (i.e., more than one) guide posts 2 may be provided, each guide post arranged along the circumferential direction of the support flange 1. For example, in... Figure 2 In the illustrated embodiment, two guide posts 2 are provided. Of course, in other embodiments, three, four, or more guide posts can be provided as needed. Generally speaking, the greater the impact load of the power tool, the more guide posts are preferred.

[0044] In this embodiment, at least one guide post is fitted with a first spring 4 and a second spring 5. This indicates that in some embodiments, when there are multiple guide posts, the first spring 4 and the second spring 5 can be provided on only one guide post. Of course, in other embodiments, such as Figure 5 As shown, a first spring 4 and a second spring 5 can also be installed on multiple guide posts. Generally speaking, the greater the impact load of the power tool, the more springs are tended to be installed.

[0045] Of course, in some other embodiments, only one guide post fitted with a first spring and a second spring may be provided.

[0046] Figure 3 A partial top view of the vibration damping mechanism described in this invention is shown.

[0047] Figure 4 Showing Figure 3 Sectional view at point AA. Figure 5 A portion was enlarged and displayed. Figure 4 The structure in.

[0048] like Figure 3 , Figure 4 and Figure 5 As shown, in some more specific embodiments, to improve the ease of assembly of the vibration damping mechanism and to ensure its structural stability under high-frequency vibration and large impact forces, the first flange 11 of the supporting flange 1 is provided with a first positioning hole 111, and the second flange 12 of the supporting flange 1 is provided with a second positioning hole 121. Thus, the head and tail ends of the guide column 2 are respectively positioned in the first positioning hole and the second positioning hole. Furthermore, the head end of the guide column 2 is press-fitted into the first positioning hole 111, thereby press-fitting the guide column 2 onto the supporting flange 1.

[0049] In some embodiments, the guide post 2 can be press-fitted onto the support flange by an interference fit between its tail end and the second positioning hole 121. Alternatively, the head and tail ends of the guide post 2 can be interference-fitted with the first positioning hole 111 and the second positioning hole 121, respectively.

[0050] To achieve more accurate and convenient positioning and installation of the guide post 2 on the support flange 1, the axial length d1 of the guide post's first end within the first positioning hole should preferably be less than or equal to the axial length d2 of the guide post's tail end within the second positioning hole. Figure 5 The display shows that d1 is greater than d2.

[0051] like Figure 2 As shown, in some embodiments, the mass block 3 may also be provided with an assembly slot 33 for accommodating the first spring and / or the second spring.

[0052] like Figure 4 and Figure 5 As shown, in some embodiments, to further guide and position the first spring during installation, the first end of the mass block 3 is provided with a first guide countersunk hole 34 for guiding the first spring 4. For the same purpose, a second guide countersunk hole 35 for guiding the second spring 5 can also be provided at the second end of the mass block 3.

[0053] like Figure 4 and Figure 5As shown, in some more specific embodiments, to achieve more accurate and convenient positioning and installation of the guide post 2 on the support flange 1, a first guide groove 15 can be provided on the first flange 11 of the support flange 1. A first support plate 17 is placed in the first guide groove, and the first support plate 17 has a first through hole for the guide post 2 to pass through. The first through hole and the first positioning hole 111 are coaxially arranged. For the same purpose, a second guide groove 16 can be provided on the second flange 12 of the support flange 1. A second support plate 18 is placed in the second guide groove, and the second support plate 18 has a second through hole for the guide post to pass through. The second through hole and the second positioning hole 121 are coaxially arranged.

[0054] In some more specific embodiments, the first guide groove 15 and / or the second guide groove 16 may be configured as a sunken blind hole provided on the support flange.

[0055] In some other, more specific embodiments, for ease of molding and manufacturing, such as Figure 2 As shown, the first guide groove 15 and / or the second guide groove 16 may have an opening 19, and the direction of the opening is the same as the tooling ejection sliding direction of the support flange.

[0056] like Figure 6 As shown, in another embodiment, the vibration damping mechanism of the present invention may further include an auxiliary guide column 6, which is provided through an auxiliary guide hole 36 provided on the mass block 3, and its two ends are respectively connected to the first flange 11 and the second flange 12 of the support flange 1, thereby providing an auxiliary guiding function. At the same time, the auxiliary guide column 6 can also further increase the strength of the vibration damping mechanism structure, especially the support flange 1.

[0057] In addition, in such Figure 6 , Figure 7 and Figure 8 In this alternative embodiment shown, the interference fit between the guide post 2 and the first positioning hole 111 and / or the second positioning hole 121 is not mandatory. In this embodiment, the guide post 2 is securely mounted on the support flange 1 by providing a pressure plate 7 that covers the first flange 11 of the support flange 1. The pressure plate 7 is fastened to the first flange 11 of the support flange 1 by fasteners 8, and simultaneously presses down the auxiliary guide post 6. It should be noted that the auxiliary guide post 6 is optional.

[0058] like Figure 7 As shown, in some more specific embodiments, the pressure plate 7 may be provided with an anti-rotation groove 71, which cooperates with the anti-rotation part 110 on the first flange of the support flange 1 to prevent the pressure plate 7 from rotating relative to the support flange 1 in its circumferential direction.

[0059] Figure 9A schematic diagram of the vibration damping mechanism described in this invention is shown in another embodiment.

[0060] like Figure 9 As shown, in this embodiment, the vibration damping mechanism is configured in a manner similar to the two embodiments described above, except that the mass block 3 is configured as a split type, which may include at least a split first mass sub-block 310 and a second mass sub-block 320. This configuration can further improve the flexibility of mass block selection and installation. For example, in some more specific embodiments, depending on the vibration damping requirements, the first mass sub-block 310 and the second mass sub-block may be made of different materials or have different mass distribution methods, so that their respective mass spring systems have the same or different natural frequencies, in order to enhance the vibration damping effect or absorb the different frequencies of movement of the power tool, such as different speed gears, under load or no load.

[0061] It is important to know that Figure 9 The two mass sub-blocks shown are merely exemplary. In other embodiments, three, four, or more mass sub-blocks may be provided based on specific vibration reduction requirements. Furthermore, the mass blocks are not limited to being divided into two mass sub-blocks by the auxiliary guide post 6.

[0062] In some more specific implementations, in order to further enhance the strength of the vibration damping mechanism, such as Figure 2 As shown, the support flange 1 may be provided with reinforcing ribs 14 extending along its axial direction.

[0063] In another embodiment of the invention, a power tool is also provided having the vibration damping mechanism described above.

[0064] For example, such as Figure 1 As shown, the vibration damping mechanism 100 is disposed within the housing 300 of the power tool and is supportedly disposed behind the actuation mechanism 200 of the power tool (i.e., Figure 1 The left side of the actuator 200 provides axial support for the actuator 200 and effectively absorbs the vibration generated by the actuator 200's linear reciprocating motion along the axial direction.

[0065] In some more specific implementations, such as Figure 1 As shown, the vibration damping mechanism 100 is disposed in the lubricating oil cavity 301 of the housing 300. With this arrangement, the vibration damping mechanism 100 can be lubricated by the lubricating oil in the lubricating oil cavity 301, so as to ensure that it can work normally without additional lubrication or maintenance during the life cycle of the power tool.

[0066] In some more specific embodiments, to further increase the arrangement space of the mass spring system within the damping mechanism 100, in the axial direction L, the support surface P1 between the damping mechanism 100 and the actuation mechanism 200 is further away from the tool head of the power tool than the support surface P2 between the damping mechanism 100 and the housing 300 (i.e., according to...). Figure 1 As shown, support surface P1 is further to the left than support surface P2.

[0067] In some more specific embodiments, the power tool is a handheld power tool, especially a lightweight handheld power tool with a small internal volume.

[0068] In some more specific embodiments, the power tool can be a hammer drill, such as a lightweight hammer drill. Of course, in other more specific embodiments, the power tool can also be a hammer drill, a hammer chisel, or other power tools with linear reciprocating motion.

[0069] Since this invention does not improve other parts of the power tool, other structures and working processes of the power tool will not be described in detail here.

[0070] It should be noted that the prior art portion of the protection scope of this invention is not limited to the embodiments given in this application. All prior art that does not contradict the solution of this invention, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included in the protection scope of this invention.

[0071] Furthermore, the combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0072] It should also be noted that the embodiments listed above are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made thereto are those that can be directly derived or easily conceived by those skilled in the art from the content disclosed in the present invention, and should all fall within the protection scope of the present invention.

Claims

1. A vibration damping mechanism for supporting the actuating mechanism of a power tool, characterized in that, The vibration damping mechanism includes: A support flange (1) has an axial direction that is the same as the direction of motion of the actuator, and the support flange has a first flange (11) and a second flange (12). The guide column (2) is connected at both ends to the first flange and the second flange of the support flange, respectively; A mass block (3) is floatingly fitted on the guide post, the mass block having a first end (31) and a second end (32) oppositely arranged in the axial direction of the support flange; A first spring (4) is sleeved on the guide post and is abutting between the first flange of the support flange and the first end of the mass block; The second spring (5) is sleeved on the guide post and is abutting between the second flange of the support flange and the second end of the mass block.

2. The vibration damping mechanism as described in claim 1, characterized in that, The mass block is arc-shaped and extends in the circumferential direction of the supporting flange; and / or at least two guide posts are provided, which are arranged along the circumferential direction of the supporting flange, wherein at least one guide post is fitted with a first spring and a second spring.

3. The vibration damping mechanism as described in claim 1, characterized in that, The first flange of the supporting flange is provided with a first positioning hole (111), and the second flange of the supporting flange is provided with a second positioning hole (121). The first end and the tail end of the guide column are respectively disposed in the first positioning hole and the second positioning hole; wherein the first end of the guide column is interference-fitted with the first positioning hole; and / or the tail end of the guide column is interference-fitted with the second positioning hole.

4. The vibration damping mechanism as described in claim 3, characterized in that, The axial length (d1) of the first end of the guide post located in the first positioning hole is less than or equal to the axial length (d2) of the tail end of the guide post located in the second positioning hole.

5. The vibration damping mechanism as described in claim 1, characterized in that, The mass block is provided with an assembly slot (33) for accommodating the first spring and / or the second spring.

6. The vibration damping mechanism as described in claim 1, characterized in that, The first end of the mass block is provided with a first guide countersunk hole (34) for guiding the first spring; and / or the second end of the mass block is provided with a second guide countersunk hole (35) for guiding the second spring.

7. The vibration damping mechanism as described in claim 1, characterized in that, The first flange of the supporting flange is provided with a first guide groove (15), and a first support plate (17) is provided in the first guide groove. The first support plate is provided with a first through hole for passing through the guide post. The first through hole and the first positioning hole are coaxially arranged; and / or the second flange of the supporting flange is provided with a second guide groove (16), and a second support plate (18) is provided in the second guide groove. The second support plate is provided with a second through hole for passing through the guide post. The second through hole and the second positioning hole are coaxially arranged.

8. The vibration damping mechanism as described in claim 1, characterized in that, It also includes an auxiliary guide post (6), which is provided through an auxiliary guide hole on the mass block and is connected to the first and second flanges of the support flange.

9. The vibration damping mechanism as described in claim 1, characterized in that, Also includes: A pressure plate (7) is placed on the first flange of the supporting flange, and the pressure plate is fixedly connected to the first flange by fasteners (8).

10. The vibration damping mechanism as described in claim 9, characterized in that, The pressure plate is provided with an anti-rotation groove (71), which cooperates with the anti-rotation part (110) on the first flange to prevent the pressure plate from rotating relative to the support flange in its circumferential direction.

11. The vibration damping mechanism as described in claim 1, characterized in that, The mass block includes at least a first mass sub-block (310) and a second mass sub-block (320) that are separately arranged; and / or the support flange is provided with reinforcing ribs (14) extending along its axial direction.

12. The vibration damping mechanism according to any one of claims 1-11, characterized in that, The supporting flange has a motor support end face (13) that is perpendicular to or parallel to the first flange and the second flange.

13. A power tool, characterized in that, It has a vibration damping mechanism (100) as described in any one of claims 1-12.

14. The power tool as claimed in claim 13, characterized in that, The power tool has a lubricating oil cavity (301) inside its housing (300), and the lubricating oil cavity contains lubricating oil.

15. The power tool as claimed in claim 13, characterized in that, In the axial direction L, the support surface P1 between the damping mechanism (100) and the action actuator (200) is further away from the tool head of the power tool than the support surface (P2) between the damping mechanism (100) and the housing (300).

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