Hedge shears transmission mechanism

Abstract

The present invention discloses a hedge shear transmission mechanism, comprising a reduction box, a driving pinion, an eccentric gear, an upper blade and a lower blade; the eccentric gear comprises an integrally arranged gear part, a first eccentric wheel and a second eccentric wheel, the first eccentric wheel and the second eccentric wheel are eccentrically arranged on both sides of the gear part, and the eccentric directions of the first eccentric wheel and the second eccentric wheel are opposite; one end of the upper blade is connected to the first eccentric wheel, and one end of the lower blade is connected to the second eccentric wheel; the eccentric gear is rotatably connected to the reduction box; and the driving pinion meshes with the eccentric gear. The present invention provides a hedge shear transmission mechanism, which has a simple transmission mechanism, simple manufacturing and processing, and convenient installation, and can reduce costs, and can also reduce the weight and volume of the hedge shear.

Description

Technical Field

[0001] The invention relates to the field of hedge shears, and in particular to a transmission mechanism of hedge shears. Background Art

[0002] Hedge shears, also known as large flat shears, fence shears, tree shears, flat shears, branch shears, hedge shears, holly shears and other garden shearing tools, are mostly used for pruning large areas of garden hedges and hedges. At present, hedge trimmers are divided into single-edged hedge trimmers and double-edged hedge trimmers. The gear rotation pair structure of the existing double-edged hedge trimmers is very complicated, which makes the manufacturing cost of the double-edged hedge trimmers high, and the mass and volume are too large, which is not conducive to hand-held use. Therefore, it is necessary to design a hedge trimmer transmission mechanism with a simple transmission mechanism, simple manufacturing and processing, and convenient installation, which can reduce costs and also reduce the weight and volume of the hedge trimmers.

[0003] Chinese patent application publication number CN204598749U, published on September 2, 2015, entitled "A handheld hedge shear with a shock-absorbing structure", discloses a handheld hedge shear with a shock-absorbing structure, comprising a base, an engine fixed on the base, a scissor assembly located at the front end of the base, and a handle located at the rear end of the base; the handle is mounted on the base through a handle fixing seat, the handle fixing seat is provided with a through hole, a bolt hole is provided at a position corresponding to the through hole on the base, and the rubber shock absorber passes through the through hole and enters the bolt hole and is tightened by a bolt. This patent still has the above problems. Summary of the invention

[0004] In order to overcome the problems in the prior art that the gear rotating pair structure of the double-edged hedge trimmer is very complicated, resulting in high manufacturing cost of the double-edged hedge trimmer, and the mass and volume are too large, which is not conducive to hand-holding during use, the present invention provides a double movable blade hedge trimmer with a simple transmission mechanism, simple manufacturing and processing, and convenient installation, which can reduce costs and also reduce the weight and volume of the hedge trimmer.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A hedge shear transmission mechanism comprises a reduction gear box, a driving pinion, an eccentric gear, an upper blade and a lower blade; the eccentric gear comprises an integrally arranged gear part, a first eccentric wheel and a second eccentric wheel, the first eccentric wheel and the second eccentric wheel are eccentrically arranged on two sides of the gear part, and the eccentric directions of the first eccentric wheel and the second eccentric wheel are opposite; one end of the upper blade is connected to the first eccentric wheel, and one end of the lower blade is connected to the second eccentric wheel; the eccentric gear is rotatably connected to the reduction gear box; the driving pinion is meshed with the eccentric gear.

[0007] In the above technical solution, the eccentric gear is an integrated structure, which is simple to manufacture and easy to install, can reduce costs, and the integrated structure can ensure the structural strength of the eccentric gear. The above technical solution can achieve the cutting power transmission of the hedge shears only through the primary transmission of the active pinion and the eccentric gear. The transmission mechanism is simple, which is more convenient to reduce the weight and volume of the hedge shears. And the upper blade and the lower blade are used to cut at the same time, which can increase the cutting effect.

[0008] Preferably, one end of the upper blade is provided with a first long groove, which is sleeved on the first eccentric wheel, and one end of the lower blade is provided with a second long groove, which is sleeved on the second eccentric wheel; the angle between the extension direction of the first long groove and the sliding direction of the upper blade is a first angle, and the degree of the first angle is 45°~90°; the angle between the extension direction of the second long groove and the sliding direction of the lower blade is a second angle, and the degree of the second angle is 45°~90°. The structure is convenient for converting the rotation of the eccentric gear into the back-and-forth translational motion of the upper blade and the lower blade.

[0009] Preferably, the first angle is 90°; the second angle is 90°.

[0010] Preferably, the first eccentric wheel is provided with a first bearing and a first bushing, the first bearing is sleeved on the first eccentric wheel, the first bushing is provided on the first bearing, and the first long groove is sleeved on the first bushing; the second eccentric wheel is provided with a second bearing and a second bushing, the second bearing is sleeved on the second eccentric wheel, the second bushing is provided on the second bearing, and the second long groove is sleeved on the second bushing. The bearing and bushing can reduce the friction generated by the eccentric gear driving the upper blade and the lower blade, reduce wear, and reduce energy consumption.

[0011] Preferably, the gear part, the first eccentric wheel and the second eccentric wheel are integrally cast. The structure is convenient for increasing structural strength and reducing costs.

[0012] Preferably, the first eccentric wheel and the second eccentric wheel are of a central symmetrical structure, which can reduce vibration and facilitate manufacturing.

[0013] Preferably, the first eccentric wheel is provided with a first through hole, and the second eccentric wheel is provided with a second through hole. The structure can reduce the weight of the transmission mechanism and also play a role of dynamic balance.

[0014] The beneficial effects of the present invention are as follows: (1) the transmission mechanism is simple, which makes it easier to reduce the weight and volume of the hedge shears; (2) the eccentric gear is an integrated structure, which is simple to manufacture and process, convenient to install, and can reduce costs, and the integrated structure can ensure the structural strength of the eccentric gear; (3) the bearing and the bushing can reduce the friction generated by the eccentric gear driving the upper blade and the lower blade, reduce wear, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 Front view of the hedge shears;

[0017] Figure 3 is a schematic structural diagram of Example 3;

[0018] Figure 4 It is a structural schematic diagram of Example 4.

[0019] In the figure: casing 1, reduction box body 1.1, upper pressure plate 1.2, lower pressure plate 1.3, driving member 2, driving pinion 3, eccentric gear 4, gear part 4.1, first eccentric wheel 4.2, second eccentric wheel 4.3, first through hole 4.4, second through hole 4.5, upper blade 5, lower blade 6, second connecting part 6.1, second long groove 6.2, no-load hole 6.3, limiting protrusion 6.4, first bearing 7, first bushing 8, second bearing 9, second bushing 10, first connecting rod 11, second connecting rod 12, front handle 13, locking mechanism 14, locking block 14.1, rotating member 14.2. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Embodiment 1:

[0022] like Figure 1 and Figure 2As shown, a double movable blade hedge trimmer includes a housing 1, a driving member 2 and a hedge trimmer transmission mechanism, wherein the hedge trimmer transmission mechanism includes a driving pinion 3, an eccentric gear 4, an upper blade 5 and a lower blade 6; the housing 1 includes a reduction box 1.1, an upper pressure plate 1.2 and a lower pressure plate 1.3, the driving pinion 3 and the eccentric gear 4 are arranged in the reduction box 1.1, one end of the upper blade 5 is arranged in the reduction box 1.1, and one end of the lower blade 6 is arranged in the reduction box 1.1. The upper blade 5 and the lower blade 6 are arranged between the upper pressure plate 1.2 and the lower pressure plate 1.3. The eccentric gear 4 includes a gear portion 4.1, a first eccentric wheel 4.2 and a second eccentric wheel 4.3, which are integrally cast; the first eccentric wheel 4.2 and the second eccentric wheel 4.3 are eccentrically arranged on both sides of the gear portion 4.1, respectively, and the first eccentric wheel 4.2 and the second eccentric wheel 4.3 are centrally symmetrical structures; the first eccentric wheel 4.2 is provided with a first through hole 4.5, and the second eccentric wheel 4.3 is provided with a second through hole 4.5; the eccentric directions of the first eccentric wheel 4.2 and the second eccentric wheel 4.3 are opposite, one end of the upper blade 5 is sleeved on the first eccentric wheel 4.2, and one end of the lower blade 6 is sleeved on the second eccentric wheel 4.3; the eccentric gear 4 is rotatably connected to the housing 1 through a bearing, and the upper blade 5 and the lower blade 6 are respectively slidably connected to the housing 1; the driving pinion 3 is connected to the output shaft of the driving member 2, and the driving pinion 3 is meshed with the eccentric gear 4. A front handle 13 is provided on the housing 1.

[0023] In the above technical solution, the eccentric gear 4 is an integrated structure, which is simple to manufacture and easy to install, can reduce costs, and the integrated structure can ensure the structural strength of the eccentric gear 4. The above technical solution can achieve the cutting power transmission of the hedge shears only through the primary transmission of the active pinion 3 and the eccentric gear 4. The transmission mechanism is simple, which is more convenient to reduce the weight and volume of the hedge shears. And the upper blade 5 and the lower blade 6 are used to cut at the same time, which can increase the cutting effect.

[0024] Embodiment 2:

[0025] like Figure 1 and Figure 2As shown, on the basis of Example 1, the driving member 2 is a motor, one end of the upper blade 5 is provided with a first long slot, and one end of the lower blade 6 is provided with a second long slot; the angle between the extension direction of the first long slot and the sliding direction of the upper blade 5 is a first angle, and the degree of the first angle is 90°; the angle between the extension direction of the second long slot and the sliding direction of the lower blade 6 is a second angle, and the degree of the second angle is 90°. The structure is convenient for converting the rotation of the eccentric gear 4 into the back-and-forth translational motion of the upper blade 5 and the lower blade 6. The first eccentric wheel 4.2 is provided with a first bearing 7 and a first bushing 8, the first bearing 7 is sleeved on the first eccentric wheel 4.2, the first bushing 8 is provided on the first bearing 7, and the first long slot is sleeved on the first bushing 8; the second eccentric wheel 4.3 is provided with a second bearing 9 and a second bushing 10, the second bearing 9 is sleeved on the second eccentric wheel 4.3, the second bushing 10 is provided on the second bearing 9, and the second long slot is sleeved on the second bushing 10. The bearing and the bushing can reduce the friction generated by the eccentric gear 4 driving the upper blade 5 and the lower blade 6, reduce wear and tear, and reduce energy consumption.

[0026] Embodiment 3:

[0027] like Figure 3 As shown, on the basis of Example 1, one end of the upper blade 5 is provided with a first connecting rod 11, one end of the first connecting rod 11 is hinged to the upper blade 5, and the other end of the first connecting rod 11 is hinged to the first eccentric wheel 4.2; one end of the lower blade 6 is provided with a second connecting rod 12, one end of the second connecting rod 12 is hinged to the lower blade 6, and the other end of the second connecting rod 12 is hinged to the second eccentric wheel 4.3. The driving member 2 is an engine. The upper blade 5 includes a first connecting portion and a first cutting portion, and the first connecting portion is detachably connected to the first cutting portion; the lower blade 6 includes a second connecting portion and a second cutting portion, and the second connecting portion is detachably connected to the second cutting portion. The structure facilitates the conversion of the rotation of the eccentric gear 4 into the back-and-forth translational motion of the upper blade 5 and the lower blade 6.

[0028] Embodiment 4:

[0029] like Figure 4As shown, on the basis of Example 3, an idle hole 6.3 is provided on the second connecting portion 6.1, and the idle hole 6.3 is communicated with the second long groove 6.2. The second connecting portion 6.1 and the second cutting portion are slidably connected, and the sliding direction of the second connecting portion 6.1 and the second cutting portion is perpendicular to the moving direction of the lower blade 6. It also includes a locking mechanism 14, and the locking mechanism 14 includes a locking block 14.1 and a rotating member 14.2. The locking block 14.1 and the rotating member 14.2 are rotatably connected. When the locking block 14.1 moves upward, the second connecting portion 6.1 can be driven to move upward by the limit block. When the limit protrusion 6.4 descends, it does not contact the second connecting portion 6.1. The second connecting portion 6.1 is provided with a limit protrusion 6.4, and the casing is provided with a limit groove adapted to the limit protrusion 6.4.

[0030] When the shearing mode needs to be switched, the second connection part 6.1 can be lifted upwards by the locking mechanism 14, and the limiting protrusion 6.4 is inserted into the limiting groove, so that the second connection part 6.1 cannot move in the cutting direction. At this time, the rotating member 14.2 is rotated to engage with the locking block 14.1 to prevent the locking block 14.1 from falling. At this time, the second eccentric wheel 4.3 is set in the no-load hole 6.3, and the diameter of the no-load hole 6.3 is larger than the maximum outer contour line when the second eccentric wheel 4.3 rotates. The second eccentric wheel 4.3 is unloaded and cannot drive the second connection part 6.1 to move. At this time, only the upper blade moves to achieve single-blade cutting.

Claims

1. A hedge shears transmission mechanism, characterized in that: It includes a reduction box, a driving pinion, an eccentric gear, an upper blade and a lower blade; the eccentric gear includes an integrally arranged gear part, a first eccentric wheel and a second eccentric wheel, the first eccentric wheel and the second eccentric wheel are eccentrically arranged on both sides of the gear part, and the eccentric directions of the first eccentric wheel and the second eccentric wheel are opposite; one end of the upper blade is connected to the first eccentric wheel, and one end of the lower blade is connected to the second eccentric wheel; the eccentric gear is rotatably connected to the reduction box; the driving pinion is meshed with the eccentric gear; A second long groove is provided at one end of the lower blade, and the second long groove is sleeved on the second eccentric wheel; The lower blade includes a second connecting part and a second cutting part, and the second connecting part is detachably connected to the second cutting part; the second connecting part is provided with an idle hole, and the idle hole is connected to the second long groove, and the diameter of the idle hole is larger than the maximum outer contour line when the second eccentric wheel rotates, and the second connecting part is slidably connected to the second cutting part, and the sliding direction of the second connecting part and the second cutting part is perpendicular to the moving direction of the lower blade; it also includes a locking mechanism for lifting and locking the second connecting part, and the second connecting part is provided with a limiting protrusion, and the reduction gear box body is provided with a limiting groove adapted to the limiting protrusion.

2. A hedge shears transmission mechanism according to claim 1, characterized in that: A first long groove is provided at one end of the upper blade, and the first long groove is sleeved on the first eccentric wheel; the angle between the extension direction of the first long groove and the sliding direction of the upper blade is a first angle, and the degree of the first angle is 45° to 90°; the angle between the extension direction of the second long groove and the sliding direction of the lower blade is a second angle, and the degree of the second angle is 45° to 90°.

3. A hedge shears transmission mechanism according to claim 2, characterized in that: The degree of the first angle is 90°; the degree of the second angle is 90°.

4. A hedge trimmer transmission mechanism according to claim 2, characterized in that: The first eccentric wheel is provided with a first bearing and a first bushing, the first bearing is sleeved on the first eccentric wheel, the first bushing is arranged on the first bearing, and the first long groove is sleeved on the first bushing; the second eccentric wheel is provided with a second bearing and a second bushing, the second bearing is sleeved on the second eccentric wheel, the second bushing is arranged on the second bearing, and the second long groove is sleeved on the second bushing.

5. A hedge shears transmission mechanism according to claim 1, 2, 3 or 4, characterized in that: The gear part, the first eccentric wheel and the second eccentric wheel are integrally cast.

6. A hedge shears transmission mechanism according to claim 1, 2, 3 or 4, characterized in that: The first eccentric wheel and the second eccentric wheel are of central symmetrical structure.

7. A hedge shears transmission mechanism according to claim 1, 2, 3 or 4, characterized in that: The first eccentric wheel is provided with a first through hole, and the second eccentric wheel is provided with a second through hole.

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