Handheld electric tool

Abstract

The utility model provides a handheld electric tool which comprises a machine shell and a power mechanism connected with the machine shell, and the power mechanism comprises a motor, an eccentric gear, a connecting rod assembly and a sliding guide rail. An output shaft of the motor is connected with a power gear, the eccentric gear is meshed with the power gear, the eccentric gear is provided with a positioning shaft and an eccentric shaft, the positioning shaft is arranged on the central axis of the eccentric gear, and the eccentric shaft deviates from the central axis of the eccentric gear. The connecting rod assembly comprises a linkage piece, a push rod and a connecting shaft movably connected with the linkage piece and the push rod, the first end of the linkage piece is movably connected with the eccentric shaft, and the second end of the linkage piece is movably connected with the connecting shaft. A sliding groove is formed in the sliding guide rail, one end of the connecting shaft is contained in the sliding groove, after the motor is started, the power gear drives the eccentric gear to rotate, and the linkage piece drives the connecting shaft and the push rod to linearly reciprocate relative to the sliding groove. Compared with the prior art, the working part of the handheld electric tool is more stable in operation, not prone to shaking and higher in working efficiency.

Description

Technical Field

[0001] The utility model relates to a handheld electric tool, belonging to the technical field of garden tools. Background Art

[0002] In existing reciprocating cutting tools, the gear transmission to the blade is achieved through a connecting rod connected to a rivet, or a single connecting shaft or fixed pin. This causes the blade to shake during reciprocating motion, resulting in unstable operation and reduced cutting efficiency. In addition, the blade may break, shortening its service life and even posing a safety hazard.

[0003] In view of this, it is indeed necessary to improve the existing handheld power tools to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a handheld electric tool, the working part of which is more stable during operation and less likely to shake.

[0005] To achieve the above object, the present invention provides a handheld electric tool, comprising:

[0006] chassis;

[0007] A power mechanism is connected to the housing, and the power mechanism includes:

[0008] a motor, wherein an output shaft of the motor is connected to a power gear;

[0009] an eccentric gear meshing with the power gear, the eccentric gear being provided with a positioning shaft and an eccentric shaft, the positioning shaft being arranged on the central axis of the eccentric gear, and the eccentric shaft being arranged away from the central axis of the eccentric gear;

[0010] a connecting rod assembly comprising a connecting member, a push rod, and a connecting shaft movably connecting the connecting member and the push rod, wherein a first end of the connecting member is movably connected to the eccentric shaft, and a second end of the connecting member is movably connected to the connecting shaft; and

[0011] Sliding guide rail with a sliding groove inside;

[0012] One end of the connecting shaft is received in the slide slot. After the motor is started, the power gear drives the eccentric gear to rotate, and the linkage drives the connecting shaft and the push rod to perform linear reciprocating motion relative to the slide slot.

[0013] As a further improvement of the present invention, a first mounting hole and a second mounting hole are correspondingly provided at both ends of the linkage member, the eccentric shaft passes through the first mounting hole, and the connecting shaft passes through the second mounting hole.

[0014] As a further improvement of the present invention, the eccentric shaft is connected to the first mounting hole via a bearing, and the connecting shaft is also connected to the second mounting hole via a bearing.

[0015] As a further improvement of the present invention, the end of the push rod is provided with a receiving groove and a third mounting hole that passes through the push rod and is connected to the receiving groove. The second end of the connecting member extends into the receiving groove, and the connecting shaft passes through the second mounting hole and the third mounting hole at the same time to movably connect the connecting member and the push rod.

[0016] As a further improvement of the present invention, a step portion is provided at one end of the connecting shaft, and the step portion extends into the sliding groove and is clearance-matched with the sliding guide rail.

[0017] As a further improvement of the present invention, the power mechanism further includes a housing, the motor, the eccentric gear and the connecting rod assembly are all assembled in the housing, and the sliding guide rail is assembled on the housing.

[0018] As a further improvement of the present invention, a counterweight block is further assembled in the shell, and the counterweight block is rotationally connected to the eccentric shaft and the shell at the same time to rotate relative to the shell following the eccentric shaft.

[0019] As a further improvement of the present invention, the positioning shaft and the eccentric shaft extend in opposite directions on opposite sides of the eccentric gear, a positioning bearing is sleeved on the positioning shaft, and the positioning bearing is assembled on the housing.

[0020] As a further improvement of the present invention, one end of the push rod away from the linkage member is connected to a working portion, and the working portion is exposed outside the housing.

[0021] As a further improvement of the present invention, a power connection portion is provided at one end of the handheld power tool away from the working portion, the power connection portion is located outside the casing, and a battery pack is mounted on the power connection portion.

[0022] The beneficial effects of the present invention are as follows: the handheld power tool of the present invention arranges a positioning shaft and an eccentric shaft on the eccentric gear, and at the same time, the first end of the connecting member in the connecting rod assembly is movably connected to the eccentric shaft, and the second end is movably connected to the push rod through the connecting shaft; and a sliding guide rail is arranged so that one end of the connecting shaft is accommodated in the slide groove of the sliding guide rail, so that after the motor is started, the power gear can be used to drive the eccentric gear to rotate, and at the same time, the connecting member drives the connecting shaft and the push rod to perform linear reciprocating motion relative to the slide groove, so that the working part of the handheld power tool of the present invention will be more stable during operation, less likely to shake, and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of the handheld electric tool of the utility model.

[0024] Figure 2 yes Figure 1 Assembly drawing of the power mechanism and working part.

[0025] Figure 3 yes Figure 2 Cross-sectional view of the power mechanism.

[0026] Figure 4 yes Figure 2 Internal assembly diagram of the power mechanism.

[0027] Figure 5 yes Figure 4 Schematic diagram of the three-dimensional structure of the eccentric gear.

[0028] Figure 6 yes Figure 4 Schematic diagram of the three-dimensional structure of the middle linkage.

[0029] Figure 7 yes Figure 4 Schematic diagram of the three-dimensional structure of the middle putter.

[0030] Figure 8 yes Figure 4 Assembly drawing of the connecting shaft and sliding guide rail.

[0031] Figure 9 yes Figure 8 sectional view.

[0032] Figure 10 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle casing. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See also Figure 1-Figure 2 As shown, the present invention discloses a handheld power tool 100, which is suitable for use in applications such as palm trimmers and pruning machines. The handheld power tool 100 includes a housing 200, a battery pack 300 mounted on the housing 200, a power mechanism 500 connected to the housing 200 via an intermediate rod 400, and a working unit 600 connected to the power mechanism 500. The working unit 600 of the handheld power tool 100 provides smooth operation without shaking, resulting in high operating efficiency.

[0035] Combine Figure 3-Figure 9As shown, the power mechanism 500 includes a housing 1, a motor 2, an eccentric gear 3, a connecting rod assembly 4, and a sliding guide rail 5 assembled within the housing 1. The motor 2, the eccentric gear 3, the connecting rod assembly 4, and the sliding guide rail 5 are also assembled on the housing 1. In this embodiment, the housing 1 serves as both an assembly and fixing component for the eccentric gear 3, the connecting rod assembly 4, and the sliding guide rail 5, and also integrates the motor 2, achieving multiple uses, facilitating assembly, and further improving stability after assembly.

[0036] The output shaft of the motor 2 is connected to a power gear 21, and the eccentric gear 3 is engaged with the power gear 21. When the motor 2 is started, the eccentric gear 3 is driven to rotate by the power gear 21. The output shaft of the motor 2 is parallel to the central axis of the eccentric gear 3, and the motor 2 and the eccentric gear 3 are highly integrated.

[0037] The eccentric gear 3 is provided with a positioning shaft 31 and an eccentric shaft 32. The positioning shaft 31 is provided on the central axis of the eccentric gear 3, and the eccentric shaft 32 is provided offset from the central axis of the eccentric gear 3. When the eccentric gear 3 rotates, the eccentric shaft 32 rotates around the central axis. In this embodiment, a positioning bearing 311 is sleeved on the positioning shaft 31, and the positioning bearing 311 is assembled to the housing 1. The eccentric gear 3 can be positioned and rotated relative to the housing 1 under the action of the positioning shaft 31 and the positioning bearing 311. The positioning shaft 31 serves to position the eccentric gear 3. The eccentric shaft 32 is connected to the connecting rod assembly 4 to drive the connecting rod assembly 4 to perform reciprocating motion when the eccentric gear 3 rotates.

[0038] In this embodiment, the positioning shaft 31 and the eccentric shaft 32 extend in opposite directions on opposite sides of the eccentric gear 3. Of course, in other optional embodiments, the positioning shaft 31 and the eccentric shaft 32 may also be located on the same side of the eccentric gear 3, as long as the positioning function of the positioning shaft 31 and the eccentric rotation function of the eccentric shaft 32 can be met, and there is no limitation on this.

[0039] The housing 1 is also equipped with a counterweight 6, which is rotatably connected to the eccentric shaft 32 and the housing 1 so as to rotate relative to the housing 1 following the eccentric shaft 32. Specifically, the counterweight 6 is interference-fitted with the free end of the eccentric shaft 32 to ensure assembly strength, and the counterweight 6 is connected to the housing 1 via a rotating bearing 61. The eccentric gear 3 is limited in position within the housing 1 by the positioning shaft 31 and the counterweight 6 connected to the eccentric shaft 32. In this embodiment, the counterweight 6 not only solves the imbalance caused by the eccentric shaft 32 when the eccentric gear 3 rotates, but also plays a positioning role for the eccentric gear 3.

[0040] The connecting rod assembly 4 includes a connecting member 41, a push rod 42, and a connecting shaft 43 that movably connects the connecting member 41 and the push rod 42. The first end 411 of the connecting member 41 is movably connected to the eccentric shaft 32, and the second end 412 is movably connected to the connecting shaft 43. The first end 411 of the connecting member 41 is located on the side of the counterweight 6 near the positioning shaft 31. Specifically, a first mounting hole 4111 and a second mounting hole 4121 are respectively defined at each end of the connecting member 41. The eccentric shaft 32 passes through the first mounting hole 4111, and the connecting shaft 43 passes through the second mounting hole 4121. The eccentric shaft 32 is connected to the first mounting hole 4111 via a bearing, and the connecting shaft 43 is also connected to the second mounting hole 4121 via a bearing.

[0041] Preferably, the eccentric shaft 32 is connected to the first mounting hole 4111 via a deep groove ball bearing 321, and the connecting shaft 43 is connected to the second mounting hole 4121 via a spherical bearing 430, ensuring the flexibility of the movable connection. The end of the push rod 42 is provided with a receiving groove 421 and a third mounting hole 422 that passes through the push rod 42 and communicates with the receiving groove 421. The second end 412 of the linkage 41 extends into the receiving groove 421, and the connecting shaft 43 passes through both the second mounting hole 4121 and the third mounting hole 422, movably connecting the linkage 41 and the push rod 42.

[0042] The sliding guide rail 5 is fixedly mounted on the housing 1. A slot 51 is defined within the sliding guide rail 5, and one end of the connecting shaft 43 is received within the slot 51. When the motor 2 is activated, the power gear 21 rotates the eccentric gear 3, and the linkage 41 drives the connecting shaft 43 and the push rod 42 to perform linear reciprocating motion relative to the slot 51. The connecting shaft 43 not only connects the linkage 41 and the push rod 42, but also cooperates with the sliding guide rail 5 to limit the direction of the push rod 42.

[0043] Preferably, one end of the connecting shaft 43 is provided with a step 431, which partially extends into the chute 51. The stepped surface of the step 431 cooperates with the opposing side surfaces of the chute 51, limiting the push rod 42 to linear reciprocating movement in the forward and backward directions, preventing yaw vibration in the left and right directions, thus facilitating handheld operation. Furthermore, the step 431 provides a clearance fit with the sliding guide rail 5, and the inner walls of the opposing side surfaces of the chute 51 in the sliding direction of the sliding guide rail 5 are provided with concave-convex structures 511, further preventing the push rod 42 from becoming stuck during movement.

[0044] The outer periphery of the push rod 42 is provided with a sleeve 423, and the push rod 42 is connected to the housing 1 via the sleeve 423 to reduce wear of the push rod 42 during linear reciprocating motion and extend its service life. The push rod 42 is provided with a waist-shaped groove 424 extending longitudinally therethrough. A positioning member 425 is slidably connected within the waist-shaped groove 424. The positioning member 425 is assembled on the housing 1 and serves to position the push rod 42. At the same time, the waist-shaped groove 424 prevents the movement of the push rod 42 from being restricted by the positioning member 425. The working portion 600 is connected to the end of the push rod 42 away from the linkage 41 and is exposed outside the housing 1. In this embodiment, the working portion 600 is a scimitar, which is fixed to the push rod 42 by double bolts. This improves the assembly strength of the scimitar and ensures a stable connection between the scimitar and the push rod 42 during reciprocating trimming and cutting.

[0045] like Figure 1 and Figure 10 As shown, a power connection portion 201 is provided on the outside of the housing 200. The power connection portion 201 is located at the end of the handheld power tool 100 away from the working portion 600. The battery pack 300 can be detachably assembled on the power connection portion 201 to provide the energy required for starting the motor 2. In this embodiment, the battery pack 300 and the power connection portion 201 need to be tightened with a rubber band to reduce resonance. The intermediate rod 400 connects the housing 200 and the power mechanism 500. Wires can be routed inside the intermediate rod 400 to achieve electrical conduction between the power connection portion 201 and the motor 2. At the same time, the intermediate rod 400 extends the usable length of the tool, making it convenient for pruning high branches. The intermediate rod 400 is preferably a retractable structure.

[0046] In summary, the handheld power tool 100 of the present invention provides a positioning shaft 31 and an eccentric shaft 32 on the eccentric gear 3, and simultaneously, the first end 411 of the linkage 41 in the connecting rod assembly 4 is movably connected to the eccentric shaft 32, and the second end 412 is movably connected to the push rod 42 via the connecting shaft 43. Furthermore, a sliding guide rail 5 is provided, so that one end of the connecting shaft 43 is received within the slide groove 51 of the sliding guide rail 5. Thus, after the motor 2 is started, the eccentric gear 3 can be driven to rotate via the power gear 21, while the linkage 41 simultaneously drives the connecting shaft 43 and the push rod 42 to perform linear reciprocating motion relative to the slide groove 51. The working portion 600 of the handheld power tool 100 of the present invention is more stable during operation, less prone to shaking, and more efficient.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A handheld power tool, characterized in that: include: chassis; A power mechanism is connected to the housing, and the power mechanism includes: a motor, wherein an output shaft of the motor is connected to a power gear; an eccentric gear meshing with the power gear, the eccentric gear being provided with a positioning shaft and an eccentric shaft, the positioning shaft being arranged on the central axis of the eccentric gear, and the eccentric shaft being arranged away from the central axis of the eccentric gear; A connecting rod assembly includes a connecting member, a push rod, and a connecting shaft movably connected to the connecting member and the push rod, wherein a first end of the connecting member is movably connected to the eccentric shaft, and a second end of the connecting member is movably connected to the connecting shaft; and Sliding guide rail with a sliding groove inside; One end of the connecting shaft is received in the slide slot. After the motor is started, the power gear drives the eccentric gear to rotate, and the linkage drives the connecting shaft and the push rod to perform linear reciprocating motion relative to the slide slot.

2. The handheld power tool according to claim 1, wherein: A first mounting hole and a second mounting hole are correspondingly provided at both ends of the linkage member. The eccentric shaft passes through the first mounting hole, and the connecting shaft passes through the second mounting hole.

3. The handheld power tool according to claim 2, wherein: The eccentric shaft is connected to the first mounting hole via a bearing, and the connecting shaft is also connected to the second mounting hole via a bearing.

4. The handheld power tool according to claim 2, wherein: The end of the push rod is provided with a receiving groove and a third mounting hole that passes through the push rod and is connected to the receiving groove. The second end of the connecting member extends into the receiving groove, and the connecting shaft passes through the second mounting hole and the third mounting hole at the same time to movably connect the connecting member and the push rod.

5. The handheld power tool according to claim 1, wherein: One end of the connecting shaft is provided with a step portion, which extends into the sliding groove and is clearance-matched with the sliding guide rail.

6. The handheld power tool according to claim 1, wherein: The power mechanism further includes a housing, the motor, the eccentric gear and the connecting rod assembly are all assembled in the housing, and the sliding guide rail is assembled on the housing.

7. The handheld power tool according to claim 6, wherein: A counterweight block is also assembled in the shell, and the counterweight block is rotatably connected to the eccentric shaft and the shell at the same time, so as to rotate relative to the shell following the eccentric shaft.

8. The handheld power tool according to claim 6, wherein: The positioning shaft and the eccentric shaft extend in opposite directions on two opposite sides of the eccentric gear. A positioning bearing is sleeved on the positioning shaft, and the positioning bearing is assembled on the housing.

9. The handheld power tool according to claim 6, wherein: One end of the push rod away from the linking member is connected to a working portion, and the working portion is exposed outside the shell.

10. The handheld power tool according to claim 9, wherein: A power connection portion is provided at one end of the handheld power tool away from the working portion. The power connection portion is located outside the housing, and a battery pack is arranged on the power connection portion.

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