Axially collinear garden machinery transmission mechanism

Abstract

The utility model discloses an axial collinear garden machinery drive mechanism belongs to garden machinery field, including power part, drive link part and machine head part. Core design is: power output, drive link part, machine head input and operation cutter four coaxial in same center axis, form full link axial collinear structure, drive link adopts outer tube + inner rod + bearing design, ensures that torque stable transmission, and machine head realizes 90 degree power reversal through bevel gear assembly, drives operation cutter work. This mechanism eliminates eccentric moment from structure, has the advantage that operation is stable, transmission efficiency is high, operation fatigue is low, effectively solves the safety hidden danger and power loss problem of existing high branch machine, is applicable to high branch chain saw, hedge trimmer and other garden equipment.

Description

Technical Field

[0001] This utility model belongs to the field of garden machinery technology, specifically relating to a garden machinery transmission mechanism suitable for high branch pruning operations, and more particularly to an axially collinear garden machinery transmission mechanism that eliminates eccentric torque and improves operational stability through a full-link axial collinear design of "power-transmission-operation". Background Technology

[0002] In high-branch landscaping operations (such as high-branch chainsaw cutting and high-branch hedge trimming), the transmission mechanism is the core component connecting the power unit below and the machine head at the height. Its structural rationality directly determines operational safety and work efficiency. Existing transmission mechanisms of high-branch landscaping machinery generally suffer from "axial misalignment" defects. A typical example is the "high-branch machine rotation positioning device" disclosed in Chinese patent CN211960184U: the working tools (hedge saw blades, chainsaw guide plates) are not on the same axis as the transmission rod and the power output end, forming an "eccentric structure".

[0003] This eccentric structure leads to three core problems:

[0004] 1. High operational safety risks: The eccentric torque generated by the eccentric drive requires the operator to apply additional force to counteract the rotation tendency of the machine head, which can easily lead to unstable grip and slippage. Especially when working at height, it may cause safety accidents such as the machine head falling off.

[0005] 2. Severe power loss and component wear: Eccentric torque is converted into radial force, which aggravates the wear of transmission rod bearings and head gears, resulting in a 15%-20% decrease in power transmission efficiency and shortening the service life of the equipment;

[0006] 3. High job fatigue: The eccentric torque acts continuously on the operator's arm, which can easily lead to muscle soreness and reduce the quality of work and the duration of continuous work after a long period of work.

[0007] To address the axial misalignment defect in existing transmission mechanisms, this invention provides a garden machinery transmission mechanism with full-link axial collinearity, eliminating eccentric torque at its structural root. Utility Model Content

[0008] The purpose of this utility model is to overcome the defects of existing high-branch garden machinery transmission mechanisms, such as unstable operation, high power loss, and high fatigue caused by axial misalignment, and to provide an axially collinear garden machinery transmission mechanism. Through the collinear design of power output, transmission, and working tools, stable transmission and safe operation are achieved.

[0009] The above-mentioned objective of this utility model is achieved through the following technical solution: an axially collinear garden machinery transmission mechanism, comprising a power part, a transmission rod part, and a machine head part. The power part is provided with an output end, and the machine head part is provided with an input end, a working tool, and a gear assembly. The output end of the power part, the transmission rod part, the input end of the machine head part, and the working tool are coaxially aligned with the central axis OO, forming an axially collinear structure.

[0010] Furthermore, the power unit is a gasoline engine or an AC motor, with its output end used to transmit rotational power.

[0011] Furthermore, the transmission rod part includes an outer tube and an inner rod. The outer tube has a hollow structure, and the inner rod passes through the inside of the outer tube. The outer tube and the inner rod are connected and fixed by a bearing. One end of the inner rod is coaxially connected to the output end of the power part, and the other end is coaxially connected to the machine head part. It can rotate freely in the outer tube to transmit torque.

[0012] Furthermore, the input end of the machine head section is coaxially fixed with the inner rod of the transmission rod section.

[0013] Furthermore, the cutting tool is configured as a chainsaw guide plate and saw chain (when the machine head is a chainsaw) or a hedge trimming blade (when the machine head is a hedge trimmer) according to functional requirements.

[0014] Furthermore, the gear assembly connects the input end to the working tool and includes a driving bevel gear, a transmission bevel gear, an intermediate gear, and a driven gear. The rotating shaft of the driving bevel gear is coaxially connected to the inner rod of the transmission rod section and rotates synchronously with the inner rod. The transmission bevel gear is fixed on the rotating shaft of the intermediate gear and meshes with the driving bevel gear (meshing angle is 90°) to realize the reversal of power from axial to lateral. The intermediate gear is fixed at the other end of the rotating shaft and rotates coaxially with the transmission bevel gear. The driven gear meshes with the intermediate gear and is coaxially fixed with the drive shaft of the working tool to drive the working tool to work.

[0015] The advantages of this utility model compared with the prior art are:

[0016] 1. Significantly improved operational stability and safety: The power output end, transmission rod, machine head input end, and working tool are all collinear, eliminating eccentric torque. The operator does not need to counteract the rotation trend of the machine head. When holding the machine, the force is transmitted along the central axis, avoiding slippage and loss of control. The safety risk of working at height is reduced by more than 60%.

[0017] 2. High transmission efficiency and long component life: No radial force is generated, the wear of transmission rod bearings and machine head gear assembly is reduced by 40%, the power transmission efficiency is increased to over 95%, and the service life of the equipment is extended by 30%.

[0018] 3. Low operator fatigue: The operator's arm only needs to bear the weight of the equipment itself, without any additional eccentric torque, which can extend the continuous working time by 50%, making it suitable for large-scale garden maintenance operations.

[0019] 4. High versatility: The head unit can be switched to a chainsaw or hedge trimmer according to the operation requirements without replacing the power unit and transmission rod, reducing equipment procurement costs and adapting to high-branch operations in multiple scenarios. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention, but do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0023] Figure 3 This is a schematic diagram of the head section of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1-Power unit, 11-Output end; 2-Transmission rod part, 21-Outer tube, 22-Inner rod, 23-Bearing; 3-Head unit, 31-Input end, 32-Working tool, 33-Gear assembly, 331-Driving bevel gear, 332-Transmission bevel gear, 333-Intermediate gear, 334-Driven gear, 335-Rotating shaft, 336-Drive shaft; OO-Central axis. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, an axially collinear garden machinery transmission mechanism includes a power part 1, a transmission rod part 2, and a machine head part 3. The power part 1 is provided with an output end 11. The power part 1 is a gasoline engine or an AC motor, and the output end 11 is used to transmit rotational power.

[0027] The transmission rod part 2 includes an outer tube 21 and an inner rod 22. The outer tube 21 is a hollow structure, and the inner rod 22 passes through the inside of the outer tube 21. The outer tube 21 and the inner rod 22 are connected and fixed by a bearing 23. One end of the inner rod 22 is coaxially connected to the output end 11 of the power part 1, and the other end is coaxially connected to the head part 3. It can rotate freely inside the outer tube 21 to transmit torque.

[0028] The head section 3 is provided with an input end 31, a working tool 32, and a gear assembly 33. The input end 31 of the head section 3 is coaxially fixed with the inner rod 22 of the transmission rod section 2. The working tool 32 is configured as a chainsaw guide plate and saw chain (when the head is a chainsaw) or a hedge trimming blade (when the head is a hedge trimmer) according to functional requirements. The gear assembly 33 connects the input end 31 and the working tool 32, and includes a driving bevel gear 331, a transmission bevel gear 332, an intermediate gear 333, and a driven gear 334. The rotating shaft of the driving bevel gear 331 is coaxially connected to the inner rod 22 of the transmission rod part 2 and rotates synchronously with the inner rod 22. The transmission bevel gear 332 is fixed on the rotating shaft 335 of the intermediate gear 333 and meshes with the driving bevel gear 331 (meshing angle is 90°) to realize the reversal of power from axial to lateral. The intermediate gear 333 is fixed at the other end of the rotating shaft 335 and rotates coaxially with the transmission bevel gear 332. The driven gear 334 meshes with the intermediate gear 333 and is coaxially fixed with the drive shaft 336 of the working tool 32 to drive the working tool 32 to work.

[0029] The output end 11 of the power unit 1, the transmission rod part 2, the input end 31 of the head part 3, and the working tool 32 are coaxial on the central axis OO, forming an axially collinear structure.

[0030] The specific implementation of this utility model is as follows:

[0031] (a) Component assembly:

[0032] 1. Assembly of the transmission rod section:

[0033] The bearing 23 is press-fitted into the pre-set mounting groove on the inner wall of the outer tube 21 to ensure that the outer ring of the bearing 23 is interference-fitted with the outer tube 21.

[0034] Insert the inner rod 22 into the outer tube 21, so that the outer wall of the inner rod 22 is interference-fitted with the inner ring of the bearing 23, thus completing the assembly of the outer tube 21, the inner rod 22, and the bearing 23, ensuring that the inner rod 22 can rotate flexibly inside the outer tube 21 without radial displacement;

[0035] 2. Power and transmission connection:

[0036] One end of the inner rod 22 of the transmission rod part 2 is connected by a key or spline and fixed coaxially with the output end 11 of the power part 1, ensuring that the central axis of the two coincides with the central axis OO (coaxiality error ≤ 0.5mm).

[0037] 3. Connection between transmission and machine head:

[0038] The other end of the inner rod 22 of the transmission rod part 2 is connected by a key or spline and fixed coaxially with the input end 31 of the machine head part 3, while the rotating shaft of the drive bevel gear 331 is coaxially connected with the inner rod 22.

[0039] Assemble gear assembly 33: Fix the transmission bevel gear 332 and the intermediate gear 333 to both ends of the rotating shaft 335 respectively, ensuring that they are coaxial; press the driven gear 334 onto the drive shaft 336 of the working tool 32, adjust the gear meshing clearance, so that the transmission bevel gear 332 meshes precisely with the driving bevel gear 331, and the intermediate gear 333 meshes precisely with the driven gear 334;

[0040] Fix the working tool 32: Adjust the installation position of the working tool 32 to ensure that the working tool 32 is coaxial with the output end 11 of the power unit 1, the transmission rod part 2, and the machine head input end 31 on the central axis OO, and complete the overall assembly.

[0041] (II) Working principle:

[0042] Power transmission: When the power unit 1 is started, the output end 11 drives the inner rod 22 of the transmission rod part 2 to rotate along the central axis OO. The torque is synchronously transmitted to the driving bevel gear 331 through the inner rod 22.

[0043] Power reversal: The driving bevel gear 331 rotates and meshes with the transmission bevel gear 332 (meshing angle 90°), converting the axial power along the central axis OO into lateral power, driving the rotating shaft 335 to rotate synchronously with the intermediate gear 333;

[0044] Operation drive: The intermediate gear 333 drives the driven gear 334 to rotate, and the driven gear 334 drives the drive shaft 336 of the working tool 32 to rotate, thereby driving the working tool 32 (chainsaw guide plate and saw chain or hedge trimming blade) to complete the sawing or trimming operation;

[0045] Operating characteristics: During operation, the outer tube 21 provides stable grip support for the operator, and the inner rod 22 rotates along the central axis OO to transmit power. Because the power output end 11, the transmission rod part 2, the input end 31, and the working tool 32 are collinear, no eccentric torque is generated, the machine head does not rotate or deviate, and the operation is stable and reliable.

[0046] (III) Performance Verification:

[0047] In tests of high-branch operations in municipal landscaping, this transmission mechanism demonstrated the following advantages:

[0048] 1. Stability: The machine head does not rotate or deviate at all, and the working tool 32 always moves along the central axis OO direction. The operator's grip force is reduced by 50% compared with the traditional eccentric structure, and there is no obvious fatigue after 2 hours of continuous operation.

[0049] 2. Transmission efficiency: The power transmission efficiency is stable at 96%-98%, which is 18% higher than that of the traditional structure. After 8 hours of continuous operation, there is no obvious wear on bearing 23 and gear assembly 33.

[0050] 3. Safety: Under simulated vibration environment (vibration frequency 50Hz, amplitude 1mm), the transmission connection is not loose and there is no risk of the working tool 32 deviating from the collinear direction.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A garden machinery transmission mechanism with collinear axial direction, characterized in that: It includes a power unit (1), a transmission rod unit (2) and a machine head unit (3). The power unit (1) is provided with an output end (11), and the machine head unit (3) is provided with an input end (31), a working tool (32) and a gear assembly (33). The output end (11) of the power unit (1), the transmission rod unit (2), the input end (31) of the machine head unit (3) and the working tool (32) are coaxial on the central axis OO, forming an axially collinear structure.

2. The axially collinear garden machinery transmission mechanism according to claim 1, characterized in that: The power unit (1) is a gasoline engine or an AC motor, and the output end (11) is used to transmit rotational power.

3. The axially collinear garden machinery transmission mechanism according to claim 1, characterized in that: The transmission rod part (2) includes an outer tube (21) and an inner rod (22). The outer tube (21) is a hollow structure, and the inner rod (22) passes through the inside of the outer tube (21). The outer tube (21) and the inner rod (22) are connected and fixed by a bearing (23). One end of the inner rod (22) is coaxially connected to the output end (11) of the power part (1), and the other end is coaxially connected to the head part (3). It can rotate freely inside the outer tube (21) to transmit torque.

4. The axially collinear garden machinery transmission mechanism according to claim 3, characterized in that: The input end (31) of the machine head part (3) is coaxially fixed with the inner rod (22) of the transmission rod part (2).

5. The axially collinear garden machinery transmission mechanism according to claim 1, characterized in that: The working tool (32) is configured as a chainsaw guide plate and saw chain or hedge trimming blade according to functional requirements.

6. The axially collinear garden machinery transmission mechanism according to claim 1, characterized in that: The gear assembly (33) connects the input end (31) and the working tool (32), including a driving bevel gear (331), a transmission bevel gear (332), an intermediate gear (333), and a driven gear (334). The shaft of the driving bevel gear (331) is coaxially connected to the inner rod (22) of the transmission rod part (2) and rotates synchronously with the inner rod (22). The transmission bevel gear (332) is fixed on the shaft (335) of the intermediate gear (333) and meshes with the driving bevel gear (331). The intermediate gear (333) is fixed on the other end of the shaft (335) and rotates coaxially with the transmission bevel gear (332). The driven gear (334) meshes with the intermediate gear (333) and is coaxially fixed with the drive shaft (336) of the working tool (32).

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