A multi-functional vibration damping tool

Abstract

A multifunctional vibration damping tool includes a housing, a motor located within the housing, a transmission mechanism connected to the motor, and an actuator driven by the transmission mechanism. The housing includes an inner housing that encloses the motor, the transmission mechanism, and the actuator, and an outer housing located outside the inner housing. The motor has a motor shaft extending along a second axis, and the motor shaft rotates about the second axis. The actuator includes a main shaft extending along a first axis perpendicular to the second axis and rotating about the first axis, and a tool head connected to the end of the main shaft. The inner housing, the motor, the transmission mechanism, and the actuator together form a vibration body. The vibration body has a center of gravity, a first rotating shaft located at a position 5 - 15 mm in front of the center of gravity, and first bearings installed at both ends of the first rotating shaft. The first rotating shaft is arranged perpendicular to the second axis, and the first bearings abut against the inner wall of the outer housing. This reduces the degree of freedom of up-and-down deflection of the vibration body during vibration, solving the problem of poor six-degree-of-freedom vibration isolation and control feeling of multifunctional tools in the current market.

Description

Technical Field

[0002] The present invention relates to a multifunctional tool, and particularly to a multifunctional damping tool of a swinging type.

Background Art

[0004] A multifunctional tool is known, and this multifunctional tool performs a machining operation on a workpiece by driving a tool head mounted on a main shaft to swing within a specified angular range (so-called vibration tool). In such a multifunctional tool, an internal motor and transmission components are positioned by a housing, so that the vibration of the multifunctional tool is transmitted outward from the housing and the vibration is relatively large, resulting in a poor vibration isolation effect, which will cause a relatively large fatigue feeling in manual operation. At present, elastic elements are added to some multifunctional tools to reduce vibration. However, after the elastic elements are added to the multifunctional tool, there are still problems such as poor control feeling of six-degree-of-freedom vibration isolation and large vibration isolation force.

Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a multifunctional damping tool that can reduce the freedom degree of up-and-down deflection and has a small vibration isolation force.

[0007] The present invention can solve the problems of the prior art by adopting the following technical solutions: A multifunctional damping tool includes a housing, a motor located inside the housing, a transmission mechanism connected to the motor, and an actuator driven by the transmission mechanism. The housing includes an inner housing covering the motor, the transmission mechanism, and the actuator, and an outer housing located outside the inner housing. The motor has a motor shaft extending along a second axis, and the motor shaft rotates around the second axis. The actuator includes a main shaft extending along a first axis perpendicular to the second axis and rotating around the first axis, and a tool head connected to the end of the main shaft. The inner housing, the motor, the transmission mechanism, and the actuator together form a vibration body. The vibration body has a center of gravity, a first rotating shaft located at a position 5-15 mm in front of the center of gravity, and first bearings installed at both ends of the first rotating shaft. The first rotating shaft is perpendicular to the second axis, and the first bearings abut against the inner wall of the outer housing.

[0008] A further improvement scheme is: The inner housing includes a head housing for accommodating the main shaft, a transmission housing for accommodating the transmission mechanism, and a motor housing for accommodating the motor. The outer housing covers the head housing, the transmission housing, and the motor housing.

[0009] A further improvement scheme is: The first rotating shaft is arranged on the transmission housing, and the first rotating shaft is parallel to the first axis.

[0010] A further improvement solution is as follows: The vibration main body is further provided with a second rotating shaft located outside the motor housing and second bearings installed on both sides of the second rotating shaft, and the second rotating shaft is parallel to the first rotating shaft.

[0011] A further improvement solution is as follows: The first axis and the second axis together form a middle dividing plane, and the first rotating shaft and the first bearing are located on the middle dividing plane.

[0012] A further improvement solution is as follows: The housing is symmetrically arranged along the middle dividing plane and is provided with vibration isolation pads on both sides of the middle dividing plane, and the number of the vibration isolation pads is at least two.

[0013] A further improvement solution is as follows: The first rotating shaft is located 7.5 mm in front of the center of gravity, the vibration isolation pads are located on both sides of the head housing and on both sides behind the motor housing, and are symmetrically arranged relative to the middle dividing plane. When the stiffness of the vibration isolation pads is in the range of 10 - 50 N / mm, the following vibration acceleration can be maintained at 3.1 m / s 2

[0014] A further improvement solution is as follows: The transmission mechanism includes an eccentric shaft driven by the motor and a support bearing sleeved on the rear end of the eccentric shaft, and the transmission mechanism supports the eccentric shaft in the inner housing through the support bearing.

[0015] A further improvement solution is as follows: The eccentric shaft is located at the front end of the motor shaft, the axis of the eccentric shaft is offset from the second axis, the transmission mechanism includes a balance block in interference fit with the rear end of the eccentric shaft, the center of gravity of the balance block is offset from the second axis, and the axis of the eccentric shaft and the center of gravity of the balance block are respectively located on both sides of the second axis.

[0016] A further improvement solution is as follows: The transmission mechanism includes a ball bearing sleeved on the eccentric shaft and a fork connected to the ball bearing, the eccentric shaft drives the fork to swing reciprocally through the ball bearing, and the swing length L of the fork is greater than or equal to 28 mm and less than or equal to 35 mm.

[0017] ​Compared with the prior art, the present invention has the following beneficial effects: In the multifunctional vibration damping tool of the present invention, the inner housing, the motor, the transmission mechanism and the actuator together constitute a vibration main body. The vibration main body has a center of gravity, a first rotating shaft located at a position 5-15 mm in front of the center of gravity, and first bearings installed at both ends of the first rotating shaft. The first rotating shaft is perpendicular to the second axis, and the first bearings abut against the inner wall of the outer housing, so that the degree of freedom of up-and-down deflection of the vibration main body is reduced during vibration, and the problem of poor six-degree-of-freedom vibration isolation and control feeling of multifunctional tools on the current market is solved. In addition, a first rotating shaft is provided 7.5 mm in front of the center of gravity of the vibration main body, and vibration damping pads are provided on both sides of the head housing and on both sides behind the motor housing. When the stiffness of the vibration damping pad is in the range of 10-50 N / mm, it can maintain 3.1 m / s 2 of the following vibration acceleration, thereby further reducing the vibration of the multifunctional vibration damping tool.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes in detail the specific embodiments of the present invention with reference to the drawings:

[0020] Figure 1 is a cross-sectional view of the multifunctional vibration damping tool of the first embodiment of the present invention when installing a tool head;

[0021] Figure 2 is Figure 1 an enlarged view of the partial structures of the actuator, the transmission mechanism and the motor shown in;

[0022] Figure 3 is Figure 1 an exploded view of the multifunctional vibration damping tool shown in;

[0023] Figure 4 is Figure 1 a plan view of the vibration main body in the multifunctional vibration damping tool shown in;

[0024] Figure 5 is is Figure 1 a plan view of the fork of the multifunctional vibration damping tool shown in;

[0025] Figure 6 is Figure 1 a schematic diagram of the multifunctional vibration damping tool shown in when installing a tool head;

[0026] Figure 7 is a schematic diagram of the multifunctional vibration damping tool of the second embodiment of the present invention when installing a tool head;

[0027] Figure 8 is a plan view of the vibration main body of the multifunctional vibration damping tool of the third embodiment of the present invention when installing a vibration damping pad;

[0028] Figure 9 Yes Figure 8 It is a graph showing the relationship between the vibration isolator stiffness and the vibration acceleration after the vibration main body is installed with vibration isolators as shown in the figure.

[0029] The meanings of the reference numerals in the figure:

[0030] 100, Multifunctional vibration damping tool; 1, Actuating mechanism; 11, Tool head; 12, Spindle; 13, Support bearing; 101, First axis; 2, Transmission mechanism; 21, Eccentric shaft; 22, Support bearing; 23, Balance weight; 24, Ball bearing; 25, Fork; 251, Pawl; 252, Fork bracket; 3, Motor; 31, Motor shaft; 32, Stator; 33, Rotor; 34, Fan; 301, Second axis; 4, Housing; 41, Motor housing; 42, Outer housing; 43, Head housing; 44, Transmission housing; 45, Left housing; 46, Right housing; 401, Split plane; 5, Vibration main body; 51, First rotating shaft; 52, First bearing; 53, Second rotating shaft; 54, Second bearing; 6, Vibration isolator; 7, Power supply device; 8, Screw

Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. In the description of this specification, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "front" and "rear" hereinafter are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0037] As Figure 1 shown, the present invention provides a multi-functional damping tool 100. The multi-functional damping tool 100 is further an electric tool using electric energy as an energy source, and the multi-functional damping tool 100 can further be a hand-held multi-functional damping tool. As Figure 1 shown, the multi-functional damping tool 100 is preferably a swinging tool. Different tool heads can be installed on the swinging tool, such as a triangular abrasive, a spatula, a metal saw blade, a woodworking saw blade, a diamond saw blade, etc. Through these different tool heads, the multi-functional damping tool 100 can realize functions such as sanding, filing, shoveling, and sawing. Of course, it can be understood that the multi-functional damping tool 100 can also be other multi-functional damping tools that generate relatively large vibrations during work, such as an electric drill, a jackhammer, a reciprocating saw, a sander, etc. In fact, as long as the substantial content of the technical solution disclosed in the present invention is adopted, it can be considered to fall within the protection scope of the present invention. Of course, as a preferred embodiment, better damping effects will be produced when the multi-functional damping tool 100 adopts the substantial content disclosed below in the present invention.

[0038] Please refer to Figures 1 to 5 shown, the multi-functional damping tool 100 according to the first embodiment of the present invention includes: a housing 4, a motor 3 located in the housing, a transmission mechanism 2 connected to the motor 3, an actuator 1 driven by the transmission mechanism 2, and a power supply device 7. The housing 4 includes an inner housing covering the motor 3, the transmission mechanism 2 and the actuator 1, and an outer housing 42 located outside the inner housing. The motor 3 has a motor shaft 31 extending along a second axis 301, and the motor shaft 31 rotates around the second axis 301. The actuator 1 includes a main shaft 12 extending along a first axis 101 perpendicular to the second axis 301 and rotating around the first axis 101, and a tool head 11 connected to the end of the main shaft 12.

[0039] The main shaft 12 is a long component with a substantially cylindrical shape. In the present embodiment, the main shaft 12 is supported by a support bearing 13 in the actuator 1 so as to be rotatable about the first axis 101, and a detachable tool head 11 is provided at the lower end of the main shaft 12. In other words, the actuator 1 for mounting the tool head 11 has a working state and a mounting state. When the actuator 1 is in the working state, it can drive the tool head 11 to move together with the main shaft 12. When the actuator 1 is in the mounting state, it allows the tool head 11 to be mounted on the actuator 1 and allows the tool head 11 to be detached from the actuator 1.

[0040] Please refer to Figures 1 to 2 As shown, the motor 3 has a stator 32, a rotor 33 disposed radially inside the stator 32, and a motor shaft 31 that rotates integrally with the rotor. The motor 3 is capable of rotating about a second axis 301 perpendicular to the first axis 101; the transmission mechanism 2 transmits the rotation of the motor shaft 31 to the main shaft 12 and causes the main shaft 12 to reciprocate within an angle range defined about the first axis 101. In the present embodiment, the motor 3 is a brushless DC motor, and the rotor 33 and the motor shaft 31 are integrally formed as a single component. However, the rotor 33 and the motor shaft 31 may also be formed separately and connected to each other. The motor 3 is housed in the motor housing 41 such that the second axis 301 of the motor shaft 31 is perpendicular to the first axis 101, and a fan 34 for cooling the motor 3 is fixed to the motor shaft 31.

[0041] Please refer to Figure 2 As shown, the transmission mechanism 2 includes an eccentric shaft 21 driven by the motor 3 and a support bearing 22 sleeved on the rear end of the eccentric shaft 21. The transmission mechanism 2 supports the eccentric shaft 21 in the inner housing through the support bearing 22.

[0042] The eccentric shaft 21 is a shaft connected coaxially with the motor shaft 31 of the motor 3 (in the figure, the eccentric shaft 21 and the motor shaft 31 are integrally shown). The eccentric shaft 21 is located at the front end of the motor shaft 31, and the axis of the eccentric shaft 21 is offset from the second axis 301. The transmission mechanism 2 includes a balance weight 23 that is press-fitted to the rear end of the eccentric shaft 21. The center of gravity of the balance weight 23 is offset from the second axis 301, and the axis of the eccentric shaft 21 and the center of gravity of the balance weight 23 are respectively located on both sides of the second axis 301.

[0043] The transmission mechanism 2 includes a ball bearing 24 sleeved on the eccentric shaft 21 and a fork 25 connected to the ball bearing 24. The eccentric shaft 21 drives the fork 25 to swing reciprocally through the ball bearing 24. The length L of the fork 25 is greater than or equal to 28 mm and less than or equal to 35 mm.

[0044] The fork 25 is a component connecting the ball bearing 24 and the main shaft 12. The fork 25 extends across the transmission mechanism 2 into the actuator 1. One end of the fork 25 is formed in a ring shape and is fixed to the outer periphery of the main shaft 12 on the support bearing 13 that supports the main shaft 12. The other end of the fork 25 is formed in a bifurcated shape and is configured to abut against the outer peripheral surface of the outer ring of the ball bearing 24 from the left and right.

[0045] The reciprocating swing of the fork 25 is transmitted to the main shaft 12, causing the main shaft 12 to reciprocally rotate within a specified angular range about the first axis 101. In other words, when the motor 3 is driven, the eccentric shaft 21 rotates integrally with the motor shaft 31. As the eccentric shaft 21 rotates, the fork 25 swings within a specified angular range centered on the first axis 101 of the main shaft 12, and the main shaft 12 reciprocally rotates within a specified angular range about the first axis 101 along with the swinging motion of the fork 25. As a result, the tool head 11 fixed to the main shaft 12 is driven to swing about the first axis 101 on the swing plane P1 (see Figure 1 ), enabling the machining operation.

[0046] Please refer to Figure 3 and Figure 5 As shown, the housing 4 includes an inner housing and an outer housing 42. The inner housing includes a head housing 43 that can accommodate the main shaft 12, a transmission housing 44 that houses the transmission mechanism 2, and a motor housing 41 that houses the motor 3. The outer housing 42 covers the head housing 43, the transmission housing 44, and the motor housing 41. The transmission housing 44 and the motor housing 41 are preferably fixedly connected by screws 8. Of course, in other embodiments, the screws 8 can be replaced with pins.

[0047] Please refer to Figure 4 As shown, the inner housing, the motor 3, the transmission mechanism 2, and the actuator 1 together constitute a vibration body 5. The vibration body 5 has a center of gravity G, a first rotating shaft 51 located at a position 5 - 15 mm in front of the center of gravity G, and first bearings 52 mounted at both ends of the first rotating shaft 51. The first rotating shaft 51 is perpendicular to the second axis 301, and the first bearings 52 abut against the inner wall of the outer housing 42. In the first embodiment of the present invention, the first rotating shaft 51 is provided on the transmission housing 44, and the first rotating shaft 51 is parallel to the first axis 101.

[0048] In addition, since the materials of the actuator, the transmission mechanism, the motor, and the housing are different, for example, metals and resin materials will cause changes in the position of the center of gravity G, so the first rotating shaft of this solution may also be installed on the transmission mechanism or the motor. Of course, the first rotating shaft of the present invention can be one or more. As long as the ultimate goal is to be able to reduce vibration, it is within the protection scope of the present invention.

[0049] Please refer to Figure 6 As shown, the swing length L of the fork 25 is greater than or equal to 28 mm and less than or equal to 35 mm. The fork 25 includes a pawl 251 and a fork frame 252. The pawl 251 is used to contact the ball bearing 24 and is driven by the ball bearing 24 to swing back and forth. The fork frame 252 is connected to the actuator 1. The fork frame 252 includes a fork shaft hole that forms a shaft hole fit with the main shaft 12. The distance from the contact point where the pawl 251 contacts the eccentric shaft 21 to the first axis 101 of the main shaft 12 is the swing length L of the fork 25. The fork 25 is substantially symmetric about a symmetry axis. In this embodiment, the fork 25 is substantially symmetric about the second axis 301.

[0050] Please refer to Figure 7 As shown, in the second embodiment of the present invention, the vibration body 5 further includes a second rotating shaft 53 located outside the motor housing 41 and second bearings 54 installed on both sides of the second rotating shaft 53. The second rotating shaft 53 is parallel to the first rotating shaft 51.

[0051] Please refer to Figure 3 and Figure 7 As shown, in the embodiment of the present invention, the outer housing can also be divided into a left housing 45 and a right housing 46. Except for the parts connected by screws between the right housing 45 and the left housing 46, the first axis 101 and the second axis 301 together form a mid-plane. The first rotating shaft 51 and the first bearing 52 are located on the mid-plane. The outer housing is symmetric about the mid-plane 401 (see Figure 7 ). The actuator 1, the transmission mechanism 2, the motor 3, and the power supply device 7 provided in the housing 4 are also substantially symmetrically arranged about the mid-plane 401. Vibration isolation pads 6 are distributed on both sides of the mid-plane 401. The number of the vibration isolation pads 6 is at least two. In the embodiment of the present invention, a vibration isolation pad 6 can be respectively arranged on the left and right of the main shaft. Of course, the material, quantity, shape, and installation position of the vibration isolation pad can be appropriately changed within the range of elastically connecting the outer housing and the housings of each mechanism in a relatively movable manner. For example, but not limited to, the vibration isolation pad can be formed of rubber, spring elements, other types of synthetic resins. For example, but not limited to, the number of the vibration isolation pads can be three, four, or more than four. For example, but not limited to, the shape of the vibration isolation pad can be a cuboid, a cube, or a semi-circle. For example, but not limited to, the vibration isolation pad can be arranged at the rear side of the motor housing.

[0052] Please refer to Figures 8 to 9 As shown, in the third embodiment of the present invention, the position of the first rotating shaft is set at the positive direction X = 7.5 mm of the center of gravity position (i.e., 7.5 mm in front of the center of gravity), and vibration isolators are provided on both sides of the head housing and on both sides behind the motor housing, and are symmetrically arranged with respect to the middle parting plane. By adjusting the different stiffnesses of the vibration isolators, the vibration conditions are observed. It can be seen from the figure that when the stiffness of one vibration isolator changes from 0 to 50 N / mm, the vibration acceleration decreases from 3.3 m / s 2 to 2.7 m / s 2 , and among them, when the stiffness of the vibration isolator is in the range of 10 - 50 N / mm, the technical effect of maintaining the vibration acceleration below 3.1 m / s 2 can be achieved. Generally, the vibration acceleration of the multi-functional vibration damping tools on the current market is above 8 m / s 2 , while the present invention can greatly reduce the vibration of the multi-functional vibration damping tool, and has the very excellent technical effect of small vibration acceleration.

[0053] Please refer to Figure 5 and Figure 7 As shown, in this embodiment, a power supply device 7 is accommodated in the rear side portion of the rear end portion 423. The power supply device 7 includes a battery pack or an AC power supply. In this embodiment, the power supply device 7 is a battery pack. In addition, a control unit is also accommodated in the front side portion of the rear end portion 423. Although the detailed illustration is omitted here, the control unit includes a three-phase inverter, a control circuit (for example, a microcomputer having a CPU) for controlling the drive of the motor 31 via the three-phase inverter, a substrate on which the above components are mounted, and a box body for accommodating the substrate, etc. The control unit is electrically connected to the battery pack, the switch, etc. via wires not shown.

[0054] The present invention is not limited to the above specific embodiments. It can be easily understood by those of ordinary skill in the art that without departing from the principle and scope of the present invention, there are many other alternative solutions for the multi-functional vibration damping tool of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A multi-functional tool, comprising a housing, a motor located within the housing, a transmission mechanism connected to the motor, and an actuator driven by the transmission mechanism. The housing includes an inner housing covering the motor, the transmission mechanism, and the actuator, and an outer housing located outside the inner housing. The motor has a motor shaft extending along a second axis, and the motor shaft rotates about the second axis. The actuator includes a main shaft extending along a first axis perpendicular to the second axis and rotating about the first axis, and a tool head connected to the end of the main shaft. It is characterized in that: The inner housing includes a head housing for receiving the head of the main shaft, a transmission housing for receiving the transmission mechanism, and a motor housing for receiving the motor. The outer housing covers the head housing, the transmission housing, and the motor housing. The inner housing, the motor, the transmission mechanism, and the actuator together form a vibration body. The vibration body has a center of gravity, a first rotating shaft located at a position 5-15 mm in front of the center of gravity, and first bearings mounted at both ends of the first rotating shaft. The first rotating shaft is perpendicular to the second axis and parallel to the first axis. The first axis and the second axis together form a middle dividing plane. The first rotating shaft and the first bearings are located on the middle dividing plane, and the two first bearings respectively abut against the inner wall of the outer housing.

2. The multi-functional tool according to claim 1, characterized in that: The first rotating shaft is arranged on the transmission housing.

3. The multi-functional tool according to claim 2, characterized in that: The vibration body further includes a second rotating shaft located outside the motor housing and second bearings mounted on both sides of the second rotating shaft. The second rotating shaft is parallel to the first rotating shaft.

4. The multi-functional tool according to claim 3, characterized in that: The housing is symmetrically arranged along the middle dividing plane and is provided with vibration isolation pads on both sides of the middle dividing plane. The number of the vibration isolation pads is at least two.

5. The multi-functional tool according to claim 4, characterized in that The first rotating shaft is located 7.5 mm in front of the center of gravity. The vibration isolation pads are located on both sides of the head housing and on both sides behind the motor housing, and are symmetrically arranged with respect to the middle dividing plane. When the stiffness of the vibration isolation pads is in the range of 10-50 N / mm, the vibration acceleration can be maintained below 3.1 m / s2.

6. The multi-functional tool according to claim 1, characterized in that: The transmission mechanism includes an eccentric shaft driven by the motor and a support bearing sleeved on the rear end of the eccentric shaft. The transmission mechanism supports the eccentric shaft in the inner housing through the support bearing.

7. The multi-functional tool according to claim 6, characterized in that: The eccentric shaft is located at the front end of the motor shaft. The axis of the eccentric shaft is offset from the second axis. The transmission mechanism includes a balance block press-fitted with the rear end of the eccentric shaft. The center of gravity of the balance block is offset from the second axis. The axis of the eccentric shaft and the center of gravity of the balance block are respectively located on both sides of the second axis.

8. The multi-functional tool according to claim 6, characterized in that: The transmission mechanism includes a ball bearing sleeved on the eccentric shaft and a fork connected to the ball bearing. The eccentric shaft drives the fork to swing reciprocally through the ball bearing. The length L of the fork is greater than or equal to 28 mm and less than or equal to 35 mm.

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