Handheld electric tool with damping structure

Abstract

The utility model discloses a handheld electric tool with a damping structure, which comprises a shell and a power output assembly, a handle for holding is arranged on the shell, the power output assembly is at least partially arranged in the shell, a plurality of elastic damping parts are arranged between the power output assembly and the shell, and the damping parts are arranged on the shell. The damping part is fixedly arranged on one of the power output assembly and the shell, the other one of the power output assembly and the shell is fixedly connected with the damping part through a fastener, and the damping part is supported between the power output assembly and the shell so that a gap can be formed between the power output assembly and the shell. The damping piece serves as a middle connecting piece and is used for being connected between the power output assembly and the shell, when the power output assembly works, the damping piece absorbs vibration transmitted by the power output assembly to the shell, and therefore vibration borne by the hand of a user holding the handle is relieved, the load of holding operation of an operator is reduced, and comfort is improved; therefore, the operation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a handheld tool, and more particularly to a handheld power tool with a shock-absorbing structure. Background Technology

[0002] With social development and technological progress, the demand for handheld power tools such as angle grinders, hedge trimmers, and grooving machines is increasing, and their applications are becoming more and more widespread. Handheld power tools are powered by mobile power supplies or power cords and are designed to be operated by hand, making them suitable for various applications and working environments. Due to their compact size and portability, they are very popular among users.

[0003] For example, Chinese utility model patent CN203261830U discloses an electric hedge trimmer, which includes: a housing for support; a cutting assembly disposed at the front end of the housing, including upper and lower blades that move back and forth longitudinally; a drive device disposed inside the housing, including a motor that drives the blades to move longitudinally and a transmission device, the transmission device including an eccentric gear driven by the motor, the upper and lower ends of the eccentric gear being respectively connected to upper and lower connecting rods, the upper and lower connecting rods respectively driving the upper and lower blades to move back and forth; and a handle assembly including a main handle and a front handle, the front handle being disposed at the end of the housing near the cutting assembly, and the main handle being disposed at the rear end of the housing.

[0004] The power unit of existing handheld tools is installed inside the housing, and the handle is fixed to the housing. When the power unit is working, it will generate a certain amount of vibration. The vibration generated by the power unit will be transmitted to the handle through the housing, which will put a certain load on the operator when holding the handle. This will cause the operator to feel fatigued under long-term vibration, reduce work efficiency, and affect the user experience. Utility Model Content

[0005] Based on the fact that the power unit generates a certain amount of vibration during operation, and that the vibration is transmitted through the housing to the handle, causing a certain load on the operator when holding the handle, this utility model provides a handheld power tool with a shock-absorbing structure.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a handheld power tool with a shock-absorbing structure, including a housing and a power output assembly. The housing is provided with a handle for holding. The power output assembly is at least partially installed inside the housing. A plurality of elastic shock-absorbing components are provided between the power output assembly and the housing. The shock-absorbing component is fixed to one of the power output assembly and the housing. The other of the power output assembly and the housing is fixedly connected to the shock-absorbing component by fasteners. The shock-absorbing component is supported between the power output assembly and the housing so that there is a gap between the power output assembly and the housing.

[0007] A further preferred embodiment of this utility model is that the shock absorber includes a first shock absorber supported on the side of the power output assembly and a second shock absorber supported on the top or bottom of the power output assembly.

[0008] A further preferred embodiment of this utility model is as follows: the handheld power tool further includes a blade assembly. The power output assembly includes a motor, a gearbox, a transmission assembly, and a tool holder. A sleeve is fixed to the top of the gearbox, the motor is installed inside the sleeve, the transmission assembly is located inside the gearbox, the motor shaft of the motor extends into the gearbox and connects to the transmission assembly, the tool holder is fixed to the front end of the gearbox, the blade assembly is mounted on the tool holder, one end of the blade assembly is inserted from the front end of the gearbox and connected to the transmission assembly, the transmission assembly receives the power output from the motor and drives the blade assembly to perform linear reciprocating motion, the bottom of the housing has an opening for the gearbox to be installed, the front of the housing has a front opening for the tool holder to extend out, there are two first shock absorbers, the two first shock absorbers are symmetrically supported on the left and right sides of the gearbox, there are two second shock absorbers, the two second shock absorbers are respectively supported on the top of the gearbox and the top of the tool holder.

[0009] A further preferred embodiment of this utility model is as follows: the top of the housing is provided with a top opening for the sleeve to extend out, a control box is provided at the top opening, a circuit board assembly is installed inside the control box, and the control box is fixedly mounted on the gearbox and / or the sleeve.

[0010] A further preferred technical solution of this utility model is as follows: the shock absorber is a rubber column, the housing is provided with a mounting hole for mounting the rubber column, the inner wall of the mounting hole is provided with an annular retaining edge, the outer wall of the rubber column is provided with an annular retaining groove, the annular retaining edge is inserted into the annular retaining groove to fix the rubber column in the mounting hole, the fastener includes a fastening screw, and the rubber column is fixedly connected to the power output assembly by the fastening screw.

[0011] A further preferred embodiment of this invention is that the shock-absorbing component is a shock-absorbing spring.

[0012] A further preferred embodiment of this utility model is as follows: the rubber column includes two sections of a first column and a second column with different diameters. The diameter of the first column is larger than that of the second column. The first column and the second column are connected by a bevel. The annular groove is provided on the outer peripheral wall of the first column. The end face of the second column is supported on the power output assembly.

[0013] A further preferred technical solution of this utility model is as follows: a receiving groove is provided on the end face of the rubber column away from the power output assembly, and a through hole is provided on the end face of the rubber column close to the power output assembly. The through hole communicates with the receiving groove, and the fastening screw passes through the through hole.

[0014] A further preferred embodiment of this utility model is as follows: an annular protrusion is provided on the outer peripheral wall of the second column, the annular protrusion is opposite to the inner wall of the mounting hole, the outer diameter of the annular protrusion is smaller than the inner diameter of the mounting hole, and in a natural state, there is a gap between the annular protrusion and the inner wall of the mounting hole.

[0015] A further preferred embodiment of this utility model is that the opening of the receiving groove is configured as a flared opening, and the larger end of the flared opening is located on the end face of the rubber column.

[0016] Compared with the prior art, the advantage of this utility model is that it provides several elastic shock absorbers between the power output assembly and the housing. The shock absorber is fixed to one of the power output assembly and the housing, and the other of the power output assembly and the housing is fixedly connected to the shock absorber by fasteners. The shock absorber is supported between the power output assembly and the housing and serves as an intermediate connector between the power output assembly and the housing. When the power output assembly is working, the shock absorber absorbs the vibration transmitted from the power output assembly to the housing, thereby reducing the vibration experienced by the user's hand holding the handle, reducing the load on the operator's hand, improving comfort, and thus improving work efficiency. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 Overall structure diagram when the auxiliary handle is a straight grip Figure 1 ;

[0019] Figure 2 Overall structure diagram when the auxiliary handle is a straight grip Figure 1 ;

[0020] Figure 3 This is a cross-sectional view of the present invention along its length.

[0021] Figure 4 for Figure 3 A magnified view of part A;

[0022] Figure 5 for Figure 3 A magnified view of section B;

[0023] Figure 6 This is a cross-sectional view of the present invention in the width direction;

[0024] Figure 7 Exploded view of the control box, housing, and power take-off assembly;

[0025] Figure 8 This is a schematic diagram of the power output assembly.

[0026] Figure 9 This is a schematic diagram of the shell structure;

[0027] Figure 10 Schematic diagram of the shock absorber structure Figure 1 ;

[0028] Figure 11 Schematic diagram of the shock absorber structure Figure 2 ;

[0029] Figure 12 This is a schematic diagram of the overall structure when the secondary handle is a ring grip.

[0030] In the diagram: 1. Housing; 2. Main handle; 3. Power take-off assembly; 4. Control box; 5. Top opening; 6. Straight grip; 7. Blade assembly; 8. Second shock absorber; 9. First shock absorber; 10. Power connector; 11. Mounting hole; 12. Annular retaining edge; 13. Annular retaining groove; 14. Annular protruding edge; 15. Receiving groove; 16. Fastening screw; 17. Slider; 18. Lower tool holder; 19. Lower blade; 20. 21. Upper blade; 22. Nut; 23. Upper tool holder; 24. Through hole; 25. Slide groove; 26. Rubber column; 27. Gearbox; 28. Bolt; 29. ​​Ring grip; 30. Circuit board assembly; 31. Sleeve; 32. Motor; 33. Upper connecting rod; 34. Eccentric gear; 35. Lower connecting rod; 36. Opening; 37. Front opening; 38. First column; 39. Bevel; 40. Trumpet mouth. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0032] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0033] Figures 1-12 As shown, a handheld power tool with a shock-absorbing structure includes a housing 1, a power output assembly 3, and a blade assembly 7. The housing 1 is provided with a handle for holding. The power output assembly 3 is at least partially housed inside the housing 1. The blade assembly 7 is connected to the power output assembly 3 and is driven by the power output assembly 3.

[0034] Figure 1 , Figure 2 , Figure 10 As shown, the handle includes a main handle 2 and a secondary handle. The main handle 2 is located at the rear of the housing 1, and the secondary handle is located at the front of the housing 1. When the operator holds the handle, one hand holds the main handle and the other hand holds the secondary handle, which facilitates the operation of the machine. The secondary handle can be a horizontally extending straight grip 6 or a ring grip 28.

[0035] Figures 3-6 As shown, a plurality of elastic shock absorbers are provided between the power output assembly 3 and the housing 1. The shock absorber is fixed on one of the power output assembly 3 and the housing 1, and the other of the power output assembly 3 and the housing 1 is fixedly connected to the shock absorber by fasteners. The shock absorber is supported between the power output assembly 3 and the housing 1 so that there is a gap between the power output assembly 3 and the housing 1.

[0036] The shock absorber serves as an intermediate connector between the power output assembly 3 and the housing 1. When the power output assembly 3 is in operation, the shock absorber absorbs the vibration transmitted from the power output assembly 3 to the housing 1, thereby reducing the vibration experienced by the user's hand holding the handle, reducing the load on the operator's hand, improving comfort, and thus improving work efficiency.

[0037] The vibration damping components include a first vibration damper 9 supported on the side of the power output assembly 3 and a second vibration damper 8 disposed on the top or bottom of the power output assembly 3. The first vibration damper 9, supported on the side of the power output assembly 3, has a strong damping effect on the horizontal vibration transmission between the power output assembly 3 and the housing 1. The second vibration damper 8, supported on the top or bottom of the power output assembly 3, has a strong damping effect on the vertical vibration transmission between the power output assembly 3 and the housing 1. Furthermore, the first vibration damper 9 and the second vibration damper 8 also provide some vibration damping effect in other directions.

[0038] This handheld power tool is a hedge trimmer.

[0039] Figures 7-9As shown, specifically, the power output assembly 3 includes a motor 31, a gearbox 26, a transmission assembly, and a tool holder. A sleeve 30 is fixed to the top of the gearbox 26, and the motor 31 is installed inside the sleeve 30. The transmission assembly is located inside the gearbox 26, and the motor shaft of the motor 31 extends into the gearbox 26 and connects to the transmission assembly. The tool holder is fixed to the front end of the gearbox 26, and the blade assembly 7 is mounted on the tool holder. One end of the blade assembly 7 is inserted from the front end of the gearbox 26 and connected to the transmission assembly. The transmission assembly receives the power output from the motor 31 and drives the blade assembly 7 to perform linear reciprocating motion. The bottom of the housing 1 has an opening 35 for the gearbox 26 to be installed, and the front of the housing 1 has a front opening 36 for the tool holder to extend out. This structure is configured such that an opening slot for accommodating the power output assembly 3 is opened at the bottom of the housing 1, and the opening slot extends through the front of the housing 1.

[0040] Preferably, the transmission assembly includes an upper connecting rod 32, a lower connecting rod 34, and an eccentric gear 33 driven by a motor 31. The blade assembly 7 includes an upper blade 20 and a lower blade 19. The upper and lower ends of the eccentric gear 33 are respectively connected to the upper connecting rod 32 and the lower connecting rod 34. The other ends of the upper connecting rod 32 and the lower connecting rod 34 are respectively connected to the upper blade 20 and the lower blade 19. The upper connecting rod 32 and the lower connecting rod 34 drive the upper blade 20 and the lower blade 19 to reciprocate linearly.

[0041] The tool holder is connected to the gearbox 26 by bolts 27. The tool holder includes an upper tool holder 22 and a lower tool holder 18. The upper tool holder 22 is connected to the lower tool holder 18 by bolts 27. The upper blade 20 and the lower blade 19 are arranged between the upper and lower tool holders. Both the upper and lower blades are provided with a number of sliding grooves 24. A slider 17, which is slidably fitted with the bolts 27, is provided in the sliding groove 24.

[0042] Figure 4 , Figure 5 , Figure 6 As shown, there are two first damping components 9, which are symmetrically supported on the left and right sides of the gearbox 26. There are two second damping components 8, which are respectively supported on the top of the gearbox 26 and the top of the tool holder. The distribution of this structure, the first damping components 9 and the second damping components 8 form a triangular support structure, which makes the power output assembly 3 more stably connected to the housing 1.

[0043] The top of the housing 1 is provided with a top opening 5 for the sleeve 30 to extend out. A control box 4 is provided at the top opening 5. A circuit board assembly 29 is installed inside the control box 4. The control box 4 is fixedly mounted on the gearbox 26 and / or the sleeve 30. The sleeve 30 for mounting the motor 31 extends out from the top of the housing 1, and the control box 4 is external, which facilitates heat dissipation of the motor 31 and the circuit board assembly 29.

[0044] The control box 4 is fixedly mounted on the gearbox 26 and the sleeve 30 by bolts 27.

[0045] Figure 9 , Figure 10 As shown, preferably, the shock absorber is a rubber column 25. The housing 1 is provided with a mounting hole 11 for installing the rubber column 25. An annular retaining edge 12 is provided on the inner wall of the mounting hole 11, and an annular retaining groove 13 is provided on the outer wall of the rubber column 25. The annular retaining edge 12 is inserted into the annular retaining groove 13 to fix the rubber column 25 in the mounting hole 11. The fasteners include fastening screws 16, and the rubber column 25 is fixedly connected to the power output assembly 3 by fastening bolts 27. During installation, the rubber column 25 is first inserted into the annular retaining edge 12 of the mounting hole 11 through the annular retaining groove 13, and then the rubber column 25 and the power output assembly 3 are connected by fastening screws 16 to complete the installation. The assembly is convenient and simple.

[0046] The rubber column 25 includes two sections, a first column 37 and a second column 39, with different diameters. The diameter of the first column 37 is larger than that of the second column 39. The first column 37 and the second column 39 are connected by a bevel 38. An annular groove 13 is provided on the outer peripheral wall of the first column 37. The end face of the second column 39 is supported on the power output assembly 3. The annular groove 13 is provided on the larger diameter first column 37, ensuring that the wall thickness of the rubber column 25 is not too thin and thus does not affect the overall strength. The first column 37 and the second column 39 are connected by a bevel 38, and the end face of the second column 39 is supported on the power output assembly 3. This structure gives the rubber column 25 stronger support and elasticity in its axial direction. When the power output assembly 3 vibrates, the rubber column 25 can better absorb the vibration in its axial direction to achieve a better shock absorption effect.

[0047] The outer peripheral wall of the second column 39 is provided with an annular protrusion 14, which is opposite to the inner wall of the mounting hole 11. The outer diameter of the annular protrusion 14 is smaller than the inner diameter of the mounting hole 11. In its natural state, there is a gap between the annular protrusion 14 and the inner wall of the mounting hole 11.

[0048] A receiving groove 15 is provided on the end face of the rubber post 25 away from the power output assembly 3, and a through hole 23 is provided on the end face of the rubber post 25 near the power output assembly 3. The through hole 23 communicates with the receiving groove 15, and the fastening screw 16 passes through the through hole 23.

[0049] There are two ways to install the fastening screw 16. In one method, the fastening screw 16 passes through the through hole 23 and is threaded into the power take-off assembly 3. In this method, the head of the fastening screw 16 is housed in the receiving groove 15, and a washer can be placed on the fastening screw 16 to make the connection tighter. In the other method, the fastening screw 16 passes through the power take-off assembly 3 and the through hole 23 in sequence and is threaded into the nut 21 in the receiving groove 15. When there is a gap between the rubber post 25 and the power take-off assembly 3, a shim can be placed between the rubber post 25 and the power take-off assembly 3 to eliminate the gap and form elastic support.

[0050] The fastening screw 16 connecting the tool holder and the shock absorber is shared with the bolt 27 connecting the upper tool holder 22 and the lower tool holder 18.

[0051] The opening of the receiving groove 15 is set as a flared mouth 40, and the larger end of the flared mouth 40 is set on the end face of the rubber column 25. The flared mouth 40 facilitates the installation and removal of the fastening screw 16 or nut.

[0052] The housing 1 is provided with a power socket 10 for connecting a power cord for power supply.

[0053] Regarding the structure of the shock absorber, this patent also provides another solution, in which the shock absorber is a shock absorber spring, preferably a T-shaped spring.

[0054] The aforementioned handheld power tools with shock-absorbing structures are not limited to hedge trimmers; they can be used with other handheld tools as well.

[0055] The above describes the handheld power tool with a shock-absorbing structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A hand-held power tool with a damping structure, comprising a housing and a power output assembly, a handle is arranged on the housing for holding, the power output assembly is at least partially arranged in the housing, characterized in that, The power output assembly and the shell are provided with a plurality of elastic damping members, the damping members are fixed on one of the power output assembly and the shell, the other of the power output assembly and the shell is fixedly connected with the damping members through fasteners, and the damping members are supported between the power output assembly and the shell to have a spacing between the power output assembly and the shell.

2. The hand-held power tool with a damping structure according to claim 1, characterized in that, The damping members include first damping members supported on the side of the power output assembly and second damping members supported on the top or bottom of the power output assembly.

3. The hand-held power tool with a damping structure according to claim 2, characterized in that The handheld electric tool further comprises a blade assembly, the power output assembly comprises a motor, a gear box, a transmission assembly and a blade holder, a sleeve is fixedly arranged on the top of the gear box, the motor is arranged in the sleeve, the transmission assembly is arranged in the gear box, a motor shaft of the motor extends into the gear box and is connected with the transmission assembly, the blade holder is fixedly arranged on the front end of the gear box, the blade assembly is arranged on the blade holder, one end of the blade assembly is inserted into the gear box from the front end of the gear box and is connected with the transmission assembly, the transmission assembly receives power output by the motor and drives the blade assembly to make linear reciprocating motion, the bottom of the shell is provided with an opening for the gear box to be arranged in, the front part of the shell is provided with a front opening for the blade holder to extend out, the first damping members are two, and the two first damping members are symmetrically supported on the left and right sides of the gear box, the second damping members are two, and the two second damping members are respectively supported on the top of the gear box and the top of the blade holder.

4. The hand-held power tool with a damping structure according to claim 3, characterized in that, The top of the shell is provided with a top opening for the sleeve to extend out, and a control box is arranged at the top opening, a circuit board assembly is arranged in the control box, and the control box is fixedly arranged on the gear box and / or the sleeve.

5. The hand-held power tool with a damping structure according to claim 1 or 2, characterized in that, The damping members are rubber columns, the shell is provided with mounting holes for mounting the rubber columns, annular clamping edges are arranged on the inner walls of the mounting holes, annular clamping grooves are correspondingly arranged on the outer walls of the rubber columns, the rubber columns are fixed in the mounting holes by clamping the annular clamping edges into the annular clamping grooves, and the fasteners comprise fastening screws.

6. The hand-held electric power tool with a damping structure according to claim 1 or 2, characterized by, The damping members are damping springs.

7. The hand-held power tool with a damping structure according to claim 5, characterized in that The rubber column comprises a first column body and a second column body with different diameters, the diameter of the first column body is larger than that of the second column body, and the first column body and the second column body are connected through an inclined edge, the annular clamping groove is arranged on the outer peripheral wall of the first column body, and the end face of the second column body is supported on the power output assembly.

8. The hand-held power tool with a damping structure according to claim 5, characterized by, An accommodating groove is arranged on the end face of the rubber column away from the power output assembly, a through hole is arranged on the end face of the rubber column close to the power output assembly, the through hole is communicated with the accommodating groove, and the fastening screw passes through the through hole.

9. The hand-held power tool with a damping structure according to claim 7, characterized in that, An annular convex edge is arranged on the outer peripheral wall of the second column body, the annular convex edge is opposite to the inner wall of the mounting hole, the outer diameter of the annular convex edge is smaller than the inner diameter of the mounting hole, and in a natural state, there is a gap between the annular convex edge and the inner wall of the mounting hole.

10. The hand-held power tool with a damping structure according to claim 8, characterized in that The slot of the accommodating groove is arranged as a horn mouth, and the large end of the horn mouth is arranged on the end face of the rubber column.

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