Angle grinder with damping mechanism

Abstract

The angle grinder with the vibration reduction mechanism comprises the vibration reduction mechanism located between the gearbox upper cover and the gearbox lower cover, the vibration reduction mechanism counteracts vibration generated in the movement process of the angle grinder through the vibration absorber, the vibration sensing amount transmitted to a user is effectively reduced, and the vibration reduction effect is improved. And vibration impact on other parts of the angle grinder is relieved, so that the service life of other parts of the angle grinder is prolonged.

Description

Technical Field

[0001] The invention relates to an angle grinder, in particular to an angle grinder with a vibration reduction mechanism. Background Art

[0002] An angle grinder is a tool that uses high-speed rotating thin grinding wheels and other discs to grind, cut, remove rust and polish workpieces. In addition to the centrifugal force generated by the disc itself due to the offset of the center of mass during high-speed rotation, it is also subject to uneven resistance from the workpiece during operation. Therefore, the tool will vibrate during use due to the existence of these changing forces. These vibrations will be transmitted to the operator through the handle, causing discomfort to the user. These vibrations need to be effectively suppressed and controlled within a reasonable range.

[0003] At present, the measure to solve the vibration of electric tools is generally to connect an elastic element in series on the handle of the body. For example, the vibration reduction solution provided in the reference WO2023024021A1 public text provides effective vibration decoupling between the handle and the vibrating body, so that the vibration generated by the vibrating body in the tool housing is greatly attenuated at multiple vibration damping mechanisms between the handle and the tool body.

[0004] When the vibration wave of the machine passes through the elastic element, it will be partially absorbed by the elastic element, which greatly reduces the vibration transmitted to the human hand. However, the connection of the elastic element to the handle requires certain structural space requirements, and the design and application are greatly restricted. In addition, due to the limitations of its own materials and structural design, the elastic element has limited ability to absorb vibration, and the vibration reduction effect cannot meet the application requirements in many cases. Summary of the invention

[0005] The invention provides an angle grinder with a vibration reduction mechanism, which can effectively suppress the vibration generated by the machine itself during operation and improve the use comfort.

[0006] In order to achieve the above object, according to one aspect of the present invention, an angle grinder with a vibration reduction mechanism is provided, comprising: A housing, wherein a motor is disposed in the housing, and an output end of the motor is connected to the first gear; A gearbox, comprising a gearbox upper cover and a gearbox lower cover, wherein an output shaft and a second gear matched with the first gear are arranged in the gearbox, wherein the second gear is mounted on the output shaft; The output end of the output shaft protrudes from the gearbox lower cover and is connected to a detachable tool head; It also includes a vibration damping mechanism, which is located between the gearbox upper cover and the gearbox lower cover. The vibration damping mechanism includes a vibration damper housing, and the vibration damper housing is coaxial with the gearbox upper cover and the gearbox lower cover. A groove and a vibration damper located in the groove are provided on the inner circumference of the vibration damper housing.

[0007] According to a further solution created by the present invention, the shock absorber includes an elastic member and a counterweight block, two ends of the counterweight block are respectively connected to the elastic member, and the other end of the elastic member is connected to the inner wall of the groove.

[0008] According to a further solution of the present invention, the elastic member and the counterweight are arranged along the circumferential direction and parallel to the inner wall of the groove in the circumferential direction.

[0009] According to a further solution of the present invention, there are two or more grooves, which are symmetrically distributed along the axial direction.

[0010] According to a further solution of the present invention, a sealing cover plate is provided on the upper end surface of the groove, and the groove and the sealing cover plate form a sealed cavity.

[0011] According to a further solution of the present invention, the shock absorber housing is sleeved outside the output shaft and is separated from the output shaft in radial direction.

[0012] The angle grinder with the vibration reduction mechanism provided by the present invention has obvious vibration absorption effect, which not only effectively reduces the vibration perception transmitted to the user, but also decomposes and absorbs part of the vibration energy through the elastic part, so that the vibration impact on other parts of the angle grinder is effectively alleviated, thereby increasing the service life of other parts of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a partial cross-sectional view of the whole structure of an embodiment of the present invention.

[0015] Figure 2 This is a partial cross-sectional view of the overall structure of an embodiment of the present invention when viewed from above.

[0016] Figure 3 It is a partial explosion schematic diagram of an embodiment of the present invention.

[0017] In the figure: 1. Upper pressure plate; 2. Lower pressure plate; 3. Output shaft; 4. Dust cover; 5. Transmission lower cover; 6. First bearing; 7. Circlip; 8. Shock absorber housing; 9. Bushing; 10. Steel ball; 11. Spring; 12. Sealing cover; 13. Second gear; 14. Second bearing; 15. Transmission upper cover; 16. First gear; 17. Motor; 18. Housing; 19. Tool head; 20. Groove. Implementation

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0020] 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 words "upper", "lower", "front", "back" and the like indicating orientation or positional relationship are 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, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "a plurality" includes more than two objects, unless the context clearly indicates otherwise. As used in this specification, the term "or" is generally used to include the meaning of "and / or", unless the context clearly indicates otherwise, and the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0022] The present invention relates to an angle grinder, such as Figure 1 As shown, the angle grinder includes a housing 18, in which a motor 17 is disposed. A first gear 16 is mounted on one end of the motor 17 extending axially toward the gearbox.

[0023] The gearbox includes a gearbox upper cover 15 and a gearbox lower cover 5 , wherein the gearbox upper cover 15 is connected to the housing 18 via fasteners, and a second gear 13 matched with the first gear 16 is disposed in the gearbox upper cover 15 .

[0024] The output shaft 3 is positioned at the center of the gearbox lower cover 5 and the gearbox upper cover 15 through the first bearing 6 and the second bearing 14. The first bearing 6 is usually pressed on the gearbox lower cover 5 by a retaining ring 7 (or a pressure plate) to prevent axial loosening. The second gear 13 is installed on the outer circle of the output shaft 3, and a bushing 9 is installed between the second gear 13 and the first bearing 6. The second bearing 14 is installed on the upper end of the output shaft 3, and the outer ring of the second bearing 14 is positioned in the bearing chamber of the gearbox upper cover 15. At this point, the motor 17 transmits the rotational motion to the output shaft 3 through the first gear 16 and the second gear 13.

[0025] The other end of the output shaft 3 away from the second gear 13 is the output end of the output shaft 3, and the output end protrudes from the lower cover 5 of the gearbox. The output end of the output shaft 3 is provided with an upper pressing plate 1 and a lower pressing plate 2, and the tool head 19 is clamped by a detachable structure. When the output shaft 3 rotates, the tool head 19 is driven to rotate, and the required workpiece can be polished and processed. In order to improve the sealing and dustproof effect, the dust cover 4 is preferably provided on the side of the lower cover 5 of the gearbox close to the output end in this embodiment.

[0026] A vibration damping mechanism is installed between the gearbox lower cover 5 and the gearbox upper cover 15. The vibration damping mechanism includes a vibration damper housing 8, which is as shown in FIG. Figure 2 As shown, its cross section is annularly sleeved on the outer circumference of the output shaft 3, and the shock absorber housing 8 and the gearbox upper cover 15 and the gearbox lower cover 5 are coaxial. In this embodiment, it is preferred that there is a gap between the shock absorber housing 8 and the output shaft 3 in the radial direction, see Figure 1 , so the shock absorber will not rotate during the movement of the output shaft 3.

[0027] A groove 20 is provided on the inner circumference of the shock absorber housing 8. In this embodiment, preferably two or more grooves 20 are used and are symmetrically distributed along the axial direction to ensure the balance and stability of the structure. A sealing cover plate 12 is provided on the upper end surface of the groove 20, so the groove 20 of the shock absorber housing 8 and the sealing cover plate 12 on the upper part thereof form a sealed cavity structure.

[0028] The vibration reduction mechanism also includes a vibration reducer located in the groove 20, specifically located in a sealed cavity formed by the groove 20 and the sealing cover plate 12 on the upper portion thereof. The vibration reducer includes an elastic member and a counterweight. For the sake of convenience in explanation, the reference scheme given in this embodiment is as follows: Figure 2-3As shown, the shock absorber includes a spring 11 and a steel ball 10. As those skilled in the art will know, the counterweight here is not limited to a steel ball, nor is it limited to a spherical shape, and the elastic element is not limited to a spring. The steel ball 10 is located in the middle of the groove 20, and its two ends are respectively connected to the spring 11, and the other end of the spring 11 is connected to the inner wall of the groove 20. The arrangement direction of the steel ball 10 and the spring 11 in each groove 20 is along the circumferential direction and parallel to the inner wall of the groove 20 in the circumferential direction, as shown in FIG. Figure 2 shown.

[0029] Therefore, the angle grinder provided by the present invention is equipped with a tool head 19. During operation, the tool head is subjected to the resistance caused by the instantaneous change when processing the workpiece and the centrifugal force generated by the offset center of the tool head due to its own center of mass. These resistances and centrifugal forces form an impact force in the opposite direction of the movement, which will be applied to the tool head and transmitted to the gearbox body through the output shaft 3. The gearbox upper cover 15 will instantly displace in the direction of the force, and the displacement will be transmitted to the shell 18 connected thereto. Due to the continuous change in the direction and size of the impact force, the displacement amount and direction are also constantly changing, so that the hand holding the shell 18 can feel the continuous swing of the shell 18, forming a vibration that can be perceived by the human body. At the same time, the shock absorber shell Due to the existence of inertia, the steel ball 10 inside the body will exert a force on the spring element 11 connected thereto in the opposite direction of the gearbox displacement when the gearbox body is subjected to instantaneous impact displacement. The impact force on the gearbox cover 15 and the force generated by the inertia of the steel ball 10 are partially offset by the energy-absorbing spring. The energy generated by the offsetting force is converted into internal energy through the deformation of the spring 11 and dissipated in the form of heat, which effectively weakens the impact force on the gearbox cover 15 caused by the instantaneous force of the tool head 19 during operation, reduces the displacement of the gearbox cover 15, and the actual swing amount felt by the hand holding the shell 18 is correspondingly reduced, resulting in reduced vibration.

[0030] Therefore, the shock absorber will not rotate during the movement of the output shaft 3. The design here takes into account that if the output shaft 3 and the shock absorber housing 8 are relatively fixed, then when the output shaft 3 rotates, the shock absorber housing 8 and the spring and steel ball inside will rotate with the rotation of the output shaft 3. Considering the high-speed operation of the tool head, the steel ball will have a movement offset from the original middle position due to the rotation inertia. If it receives an impact force at this time, it will overcome the centrifugal force and the traction force of the spring, which will affect the vibration absorption and compensation effect.

[0031] In summary, the present invention provides an angle grinder with a vibration reduction mechanism, which not only effectively reduces the amount of vibration transmitted to the user, but also alleviates the vibration impact on other parts of the angle grinder, thereby increasing the service life of other parts of the machine. At the same time, the vibration reduction mechanism has a simple and reliable structure, and the rigidity coefficient of the spring and the mass of the steel ball can be adjusted according to the actual situation of the machine to achieve the best vibration reduction effect.

[0032] The disclosed embodiments are not specifically limited to the embodiments shown in this article. Any modification, equivalent replacement, improvement, etc. made to the present invention shall fall within the protection scope of the present invention.

Claims

1. An angle grinder with a vibration reduction mechanism, comprising: A housing, wherein a motor is disposed in the housing, and an output end of the motor is connected to the first gear; A gearbox, comprising a gearbox upper cover and a gearbox lower cover, wherein an output shaft and a second gear matched with the first gear are arranged in the gearbox, wherein the second gear is mounted on the output shaft; The output end of the output shaft protrudes from the gearbox lower cover and is connected to a detachable tool head; It is characterized in that: it also includes a vibration damping mechanism, which is located between the gearbox upper cover and the gearbox lower cover, and the vibration damping mechanism includes a vibration damper housing, and the vibration damper housing is coaxial with the gearbox upper cover and the gearbox lower cover; a groove and a vibration damper located in the groove are provided on the inner circumference of the vibration damper housing.

2. An angle grinder with a vibration reduction mechanism according to claim 1, characterized in that: The shock absorber comprises an elastic member and a counterweight block, two ends of the counterweight block are respectively connected to the elastic member, and the other end of the elastic member is connected to the inner wall of the groove.

3. An angle grinder with a vibration reduction mechanism according to claim 2, characterized in that: The elastic member and the counterweight are arranged in a circumferential direction and parallel to the inner wall of the groove in the circumferential direction.

4. The angle grinder with a vibration reduction mechanism according to claim 3, characterized in that: There are two or more grooves, which are symmetrically distributed along the axial direction.

5. The angle grinder with a vibration reduction mechanism according to claim 1, characterized in that: A sealing cover plate is provided on the upper end surface of the groove, and the groove and the sealing cover plate form a sealed cavity.

6. The angle grinder with a vibration reduction mechanism according to claim 1, characterized in that: The shock absorber housing is sleeved outside the output shaft and is separated from the output shaft in radial direction.

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