Eccentric bearing connecting rod structure and electric hedge trimmer

Abstract

The eccentric type bearing connecting rod structure comprises a connecting rod and an inner rotating wheel, a first through hole is formed in one end of the connecting rod, the inner rotating wheel is rotatably installed in the first through hole, a bearing used for relative rotation of the inner rotating wheel and the first through hole is arranged between the inner rotating wheel and the inner wall of the first through hole, and the bearing comprises a rolling body. The peripheral face of the inner rotating wheel serves as an inner ring of the bearing to make contact with the inner side of the rolling body, the inner wall of the first through hole serves as an outer ring of the bearing to make contact with the outer side of the rolling body, a connecting hole is formed in the inner rotating wheel, and the connecting hole and the axis of the inner rotating wheel are eccentrically arranged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a connecting rod structure, especially an eccentric bearing connecting rod structure and electric hedge trimmer. BACKGROUND

[0002] With the continuous development of landscaping, the hedge trimmer (also known as a trimmer) has become an indispensable landscaping tool for tea, parks, courtyards, and other landscaping pruning.

[0003] For example, the utility model patent CN207927308U discloses an electric hedge trimmer, which comprises a shell, a cutting assembly and a driving device. The cutting device is arranged at the front end of the shell and comprises upper and lower blades that move longitudinally back and forth. The driving device is arranged in the shell and comprises a motor and a transmission mechanism that drives the longitudinal movement of the blades. The transmission mechanism comprises an eccentric driving wheel driven by the motor and two connecting rods. Eccentric shafts are arranged on the upper and lower end faces of the eccentric driving wheel. The two eccentric shafts are arranged in a central symmetry with the center of the eccentric driving wheel as the center. One end of each connecting rod is provided with a circular ring, and a bearing is installed in the circular ring. The upper and lower eccentric shafts of the eccentric driving wheel are respectively inserted into the bearings at the end of the two connecting rods to form a connection. The other end of each connecting rod is hingedly connected to the upper blade and the lower blade, respectively. The eccentric driving wheel drives the upper blade and the lower blade to move linearly back and forth through the two connecting rods.

[0004] The transmission assembly between the motor and the blades in the existing hedge trimmer comprises an eccentric wheel with eccentric shafts, connecting rods and bearings. During assembly, the eccentric wheel, bearings and connecting rods need to be assembled, which increases the assembly time of the whole machine and reduces the production efficiency. Meanwhile, the composition of the transmission assembly has many components, which increases the failure rate of the machine. In addition, the eccentric shafts arranged on the upper and lower end faces of the eccentric wheel cannot be consistent due to machining errors, which makes the movement of the two connecting rods driven by the eccentric shafts on both sides unbalanced, resulting in a large vibration. UTILITY MODEL CONTENTS

[0005] Based on the above-mentioned problems of the transmission structure in the hedge trimmer, which includes an eccentric wheel, connecting rods and bearings, the assembly is complicated, the failure rate is high, and the eccentric shafts arranged on the upper and lower end faces of the eccentric wheel cannot be consistent due to machining errors, which makes the movement of the connecting rods driven by the eccentric shafts on both sides unbalanced and causes a large vibration, the utility model provides an eccentric bearing connecting rod structure and an electric hedge trimmer.

[0006] The utility model discloses a technical scheme that solves the above technical problems is as follows: eccentric bearing connecting rod structure, including connecting rod and inner rotating wheel, one end of connecting rod is equipped with first through -hole, the inner rotating wheel rotatable is equipped in first through -hole, and the inner rotating wheel and the inner wall of first through -hole are equipped with the bearing for the relative rotation of both, and the bearing includes rolling element, the outer periphery of inner rotating wheel is as the inner ring of bearing and contacts the inside of rolling element, and the inner wall of first through -hole is as the outer ring of bearing and contacts the outside of rolling element, be equipped with connecting hole on the inner rotating wheel, and connecting hole and the axle of inner rotating wheel are eccentric and set up.

[0007] The utility model further preferably discloses a technical scheme that: one end of the connecting rod away from the first through -hole is equipped with the second through -hole.

[0008] The utility model further preferably discloses a technical scheme that: the connecting rod includes intermediate arm body, first ring body and second ring body, and the both ends of intermediate arm body are fixedly connected on the outer periphery of first ring body and second ring body respectively, the first ring body center forms first through -hole, and the second ring body center forms second through -hole.

[0009] The utility model further preferably discloses a technical scheme that: the inner rotating wheel is equipped with third through -hole, and third through -hole and the axle of inner rotating wheel are eccentric and set up.

[0010] The utility model further preferably discloses a technical scheme that: the inner wall of connecting hole is equipped with key groove, and the both ends of key groove respectively penetrate the upper and lower end surface of inner rotating wheel.

[0011] The utility model further preferably discloses a technical scheme that: the end face of second ring body is equipped with oil inlet groove, and the both ends of oil inlet groove are communicated with the inner wall of second through -hole and the outer periphery of second ring body respectively.

[0012] The utility model further preferably discloses a technical scheme that: first through -hole and third through -hole are equipped on the both sides of the axle of inner rotating wheel.

[0013] Another subject: electric hedge trimmer, including casing, motor, cutting device and eccentric bearing connecting rod structure, and the cutting device is equipped with the front end of casing, and the cutting device includes the upper blade and lower blade of longitudinal back and forth movement, the motor and eccentric bearing connecting rod structure are equipped in casing, and the eccentric bearing connecting rod structure is equipped with two, and two connecting rods are located below the motor and are distributed upside down, and the inner rotating wheel of the end of two connecting rods is connected with the motor shaft of motor through connecting hole, and the motor can drive two inner rotating wheels to rotate, and the front end of two connecting rods is rotatably connected with the upper blade and lower blade respectively, and two inner rotating wheels rotate, and two connecting rods drive the upper blade and lower blade to do linear reciprocating motion respectively.

[0014] Compared with the prior art, the connecting rod, the bearing and the inner rotating wheel are combined into one piece, only the two ends of the connecting rod structure are connected with the output shaft and the blade of the hedge trimmer respectively during installation, the assembly difficulty is reduced, the production efficiency is improved, and one piece reduces the number of transmission components compared with the original three pieces, the structure is simpler, and thus the failure rate is reduced.

[0015] When the connecting rod structure is applied to the electric hedge trimmer, the inner rotating wheels at the two ends of the connecting rod are directly connected with the output shaft of the motor through the eccentric connecting holes, and the connecting rod is driven to move through the inner rotating wheels, so that the connecting rod is driven to move without the eccentric shafts on the two sides of the eccentric wheel, the step of machining the eccentric shafts on the two sides of the eccentric wheel is omitted, excessive vibration caused by inconsistent machining of the eccentric shafts on the two sides is avoided, and the overall transmission is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be described in further detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can include exaggerated display, and the drawings are not necessarily drawn to scale.

[0017] Figure 1 It is the front view of connecting rod structure;

[0018] Figure 2 It is the back view of connecting rod structure;

[0019] Figure 3 It is the section view of connecting rod structure;

[0020] Figure 4 It is the local schematic of electric hedge trimmer Figure 1 ;

[0021] Figure 5 It is the local schematic of electric hedge trimmer Figure 1 ;

[0022] Figure 6 It is the local section view of electric hedge trimmer Figure 1 ;

[0023] Figure 7 It is the local section view of electric hedge trimmer Figure 2 .

[0024] In the figure: 1, connecting rod; 2, intermediate arm body; 3, second ring body; 4, second through hole; 5, oil inlet groove; 6, first ring body; 7, first through hole; 8, inner rotating wheel; 9, connecting hole; 10, key groove; 11, third through hole; 12, rolling body; 13, rolling groove; 14, gear box; 15, motor sleeve; 16, collecting cover; 17, upper knife holder; 18, lower knife holder; 19, upper blade; 20, lower blade; 21, motor shaft; 22, pivot; 23, motor. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present application will be described in detail below with reference to the drawings. Those skilled in the art will appreciate that the description is merely descriptive, exemplary, and should not be interpreted as limiting the scope of protection of the present application.

[0026] It should be noted that: similar reference numerals represent similar items in the following drawings, therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0027] Figures 1-7 As shown, the electric hedge trimmer comprises a housing, a motor 23, a cutting device and an eccentric bearing connecting rod structure, the cutting device is arranged at the front end of the housing, the cutting device comprises an upper blade 19 and a lower blade 20 moving longitudinally back and forth, the motor 23 and the eccentric bearing connecting rod structure are arranged in the housing, the eccentric bearing connecting rod structure is provided with two, the two eccentric bearing connecting rod structures are arranged below the motor 23 and are distributed in an up-down manner, one end of the two eccentric bearing connecting rod structures is connected with a motor shaft 21 extending downward from the motor 23, the other end of the two eccentric bearing connecting rod structures is connected with the upper blade 19 and the lower blade 20 respectively, and the motor 23 drives the upper blade 19 and the lower blade 20 to do linear reciprocating motion through the two eccentric bearing connecting rod structures when the motor 23 is started.

[0028] Figures 4-7As shown, a gearbox 14 is installed inside the housing. A motor sleeve 15 is fixed to the top of the gearbox 14. The bottom of the motor sleeve 15 has a through hole communicating with the inside of the gearbox 14. The motor 23 is installed inside the motor sleeve 15. Two eccentric bearing connecting rod structures are installed inside the gearbox 14. The motor shaft 21 of the motor 23 extends downward through the through hole and connects to the rear ends of the two eccentric bearing connecting rod structures inside the gearbox 14. The rear ends of the upper blade 19 and the lower blade 20 are inserted from the front end of the gearbox 14 and connect to the two eccentric bearings respectively. The front end of the rod structure is connected, and the upper side of the upper blade 19 and the lower side of the lower blade 20 are respectively provided with an upper blade holder 17 and a lower blade holder 18. The upper blade holder 17 is connected to the lower blade holder 18 by connecting bolts. The upper blade 19 and the lower blade 20 are arranged between the upper blade holder 17 and the lower blade holder 18. Both the upper blade 19 and the lower blade 20 are provided with several sliding grooves. The sliding grooves are provided with sliders that slide with them and are sleeved on the connecting bolts. The upper blade holder 17 and the lower blade holder 18 are fixed to the collection cover 16 and / or gearbox 14 installed at the front of the housing of the hedge trimmer.

[0029] The structure of the electric hedge trimmer is the same as that of the existing electric hedge trimmer, except for the eccentric bearing connecting rod structure used to connect the motor 23 and the blade.

[0030] Figures 1-3 As shown, the eccentric bearing connecting rod structure includes a connecting rod 1 and an inner rotating wheel 8. One end of the connecting rod 1 is provided with a first through hole 7. The inner rotating wheel 8 is rotatably installed in the first through hole 7. A bearing for relative rotation between the inner rotating wheel 8 and the inner wall of the first through hole 7 is provided. The bearing includes rolling elements 12. The outer circumferential surface of the inner rotating wheel 8 serves as the inner ring of the bearing and contacts the inner side of the rolling elements 12. The inner wall of the first through hole 7 serves as the outer ring of the bearing and contacts the outer side of the rolling elements 12. A connecting hole 9 is provided on the inner rotating wheel 8. The connecting hole 9 is eccentrically arranged with respect to the axis of the inner rotating wheel 8.

[0031] When the eccentric bearing connecting rod structure is installed on the electric hedge trimmer, the inner rotating wheels 8 at the rear ends of the two connecting rods 1 are connected to the motor shaft 21 of the motor 23 through the eccentrically set connecting holes 9. The motor shaft 21 of the motor 23 can drive the inner rotating wheels 8 to rotate eccentrically. The front ends of the two connecting rods 1 are respectively rotatably connected to the upper blade 19 and the lower blade 20. When the motor 23 drives the inner rotating wheels 8 to rotate eccentrically, the inner rotating wheels 8 drive the connecting rods 1 to move. Then, the two connecting rods 1 respectively drive the upper blade 19 and the lower blade 20 to perform linear reciprocating motion.

[0032] The inner rotating wheels 8 at the ends of the two connecting rods 1 can be configured such that their axes are not on the same straight line, so that when the motor shaft 21 rotates, the upper blade 19 and the lower blade 20 move back and forth in a staggered manner.

[0033] The patent combines the connecting rod 1, the bearing and the inner rotating wheel 8 into one piece, and only needs to connect the two ends of the connecting rod structure with the motor shaft 21 and the blade of the hedge trimmer during installation, which reduces the assembly difficulty, improves the production efficiency, and reduces the transmission components compared with the original three pieces, so that the structure is simpler and the failure rate is lower.

[0034] When the connecting rod structure is applied to the electric hedge trimmer, the inner rotating wheel 8 at the end of the two connecting rods 1 is directly connected with the motor shaft 21 of the motor 23 through the eccentric connecting hole 9, and the inner rotating wheel 8 inside drives the connecting rod 1 to move. This structure does not need to drive the connecting rods 1 on both sides to move through the eccentric shafts on both sides of the eccentric wheel, and eliminates the step of machining the eccentric shafts on both sides of the eccentric wheel, thereby avoiding excessive vibration caused by inconsistent machining of the eccentric shafts on both sides and making the overall transmission more stable.

[0035] The inner rotating wheel 8 at the lower end of the connecting rod 1 is limited by the snap spring arranged on the motor shaft 21 below to limit the inner rotating wheel 8 from disengaging downward from the motor shaft 21, and the inner rotating wheel 8 at the upper end of the connecting rod 1 can also be arranged with a snap spring or a washer arranged on the motor shaft 21 for axial limiting, and a support washer is arranged between the upper and lower inner rotating wheels 8 for support.

[0036] A key groove 10 is arranged on the inner wall of the connecting hole 9, and the key groove 10 penetrates the upper and lower end faces of the inner rotating wheel 8 at both ends. When the motor shaft 21 is inserted into the connecting hole 9, the motor shaft 21 is connected with the inner rotating wheel 8 by the key connection, so that the motor shaft 21 can drive the inner rotating wheel 8 to rotate. The motor shaft 21 is provided with a key groove for key connection, and the key inserted into the key groove 10 on the inner wall of the connecting hole 9 and the key groove on the motor shaft 21 makes the motor shaft 21 and the inner rotating wheel 8 connected, and the key groove 10 on the inner wall of the connecting hole 9 penetrates the upper and lower end faces of the inner rotating wheel 8, so that the key inserted on the motor shaft 21 can slide into the key groove 10 on the inner wall of the connecting hole 9 when the motor shaft 21 is inserted into the connecting hole 9.

[0037] Preferably, the rolling body 12 is a steel ball or a roller pin. When the rolling body 12 is a steel ball, the outer periphery of the inner rotating wheel 8 and the inner wall of the connecting hole 9 are provided with a rolling groove 13 for the steel ball to roll, and in addition, the outer periphery of the inner rotating wheel 8 and the inner wall of the connecting hole 9 are also provided with a retainer, and the steel ball is arranged in the retainer. A sealing cover can also be arranged in the end face annular space between the outer periphery of the inner rotating wheel 8 and the inner wall of the connecting hole 9, which can prevent dust and other impurities from entering to affect the rolling of the rolling body 12, and also can limit the leakage of internal lubricating oil.

[0038] The front end of the connecting rod 1 is pivotally connected with the rear end of the blade through a pivot shaft 22, and the connecting rod 1 is provided with a second through hole 4 at the end away from the first through hole 7, and the pivot shaft 22 is inserted into the second through hole 4 to make the connecting rod 1 rotatably connected with the blade. A bearing can also be arranged between the pivot shaft 22 and the inner wall of the second through hole 4 to reduce the rotating friction.

[0039] The connecting rod 1 comprises a middle arm body 2, a first ring body 6 and a second ring body 3, two ends of the middle arm body 2 are fixedly connected to the outer circumferential surfaces of the first ring body 6 and the second ring body 3 respectively, the first ring body 6 is formed with a first through hole 7 in the center, the second ring body 3 is formed with a second through hole 4 in the center, and the middle arm body 2, the first ring body 6 and the second ring body 3 are integrally formed.

[0040] The end surface of the second ring body 3 is provided with an oil inlet groove 5, two ends of the oil inlet groove 5 are communicated with the inner wall of the second through hole 4 and the outer circumferential surface of the second ring body 3 respectively, and when the connecting rod 1 is connected with the blade, lubricating oil can be added between the inner wall of the second through hole 4 and the pivot 22 through the oil inlet groove 5, so as to improve the smoothness of rotation and reduce the abrasion caused by rotation.

[0041] The inner rotating wheel 8 is provided with a third through hole 11, the third through hole 11 is eccentric to the axis of the inner rotating wheel 8, the third through hole 11 is used for process weight reduction and can save material cost.

[0042] The first through hole 7 and the third through hole 11 are arranged on both sides of the axis of the inner rotating wheel 8, so that the weight of the inner rotating wheel 8 is more balanced, thereby the stability of transmission can be maintained.

[0043] The eccentric bearing connecting rod structure described in the patent is not limited to be applied to the electric hedge trimmer, and the structure is also applicable to other electric tools and equipment which convert rotary motion into linear motion.

[0044] The eccentric bearing connecting rod structure and the electric hedge trimmer are introduced above, the principle and implementation mode of the utility model are described by applying specific examples in the text, and the description of the above examples is only used for helping understanding the utility model and core idea. It should be pointed out that for ordinary skilled persons in the technical field, the utility model can be improved and modified in several ways without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. An eccentric bearing link structure, characterized by, The eccentric bearing connecting rod structure comprises a connecting rod and an inner rotating wheel, one end of the connecting rod is provided with a first through hole, the inner rotating wheel is rotatably arranged in the first through hole, a bearing for relative rotation between the inner rotating wheel and the inner wall of the first through hole is arranged between the inner rotating wheel and the inner wall of the first through hole, the bearing comprises rolling bodies, the outer circumferential surface of the inner rotating wheel contacts the inner side of the rolling bodies as the inner ring of the bearing, and the inner wall of the first through hole contacts the outer side of the rolling bodies as the outer ring of the bearing, the inner rotating wheel is provided with a connecting hole, and the connecting hole is arranged eccentrically with respect to the shaft center of the inner rotating wheel.

2. The offset bearing link structure according to claim 1, characterized by The connecting rod is provided with a second through hole at the end away from the first through hole.

3. The eccentric bearing link structure according to claim 2, characterized by The connecting rod comprises a middle arm body, a first ring body and a second ring body, the two ends of the middle arm body are fixedly connected to the outer circumferential surfaces of the first ring body and the second ring body respectively, the first ring body is formed with the first through hole at the center, and the second ring body is formed with the second through hole at the center.

4. The offset bearing link structure of claim 1, wherein The inner rotating wheel is provided with a third through hole, and the third through hole is arranged eccentrically with respect to the shaft center of the inner rotating wheel.

5. The eccentric bearing link structure according to claim 1, characterized by The inner wall of the connecting hole is provided with a key groove, and the key groove penetrates the upper and lower end faces of the inner rotating wheel at two ends respectively.

6. The eccentric bearing link structure according to claim 3, characterized by The end face of the second ring body is provided with an oil inlet groove, and the two ends of the oil inlet groove are communicated with the inner wall of the second through hole and the outer circumferential surface of the second ring body respectively.

7. The eccentric bearing link structure according to claim 4, characterized by The first through hole and the third through hole are arranged on the two sides of the shaft center of the inner rotating wheel.

8. A motorised hedge trimmer characterised in that, The eccentric bearing connecting rod structure comprises a shell, a motor, a cutting device and the eccentric bearing connecting rod structure according to any one of claims 1-7, the cutting device is arranged at the front end of the shell, the cutting device comprises an upper blade and a lower blade which move longitudinally back and forth, the motor and the eccentric bearing connecting rod structure are arranged in the shell, the eccentric bearing connecting rod structure is provided with two, the two connecting rods are arranged below the motor and are distributed in an up-down mode, the inner rotating wheels at the rear end portions of the two connecting rods are connected with the motor shaft of the motor through the connecting holes, the motor can drive the two inner rotating wheels to rotate, the front ends of the two connecting rods are rotatably connected with the upper blade and the lower blade respectively, and the two connecting rods drive the upper blade and the lower blade to move linearly back and forth respectively when the two inner rotating wheels rotate.

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