A breather cap for a reduction gearbox

Abstract

The utility model relates to a forklift deceleration box technical field, the utility model provides a kind of ventilation cap of deceleration box, including stem, stem one end is equipped with the outer thread for thread sealing connection deceleration box, stem other end is equipped with ventilation end, stem is opened with through-hole along the axial direction, several straight copper wires are tightly filled with axial parallel arrangement in through-hole, and straight copper wire is formed with the ventilation gap that is communicated with the inner chamber of deceleration box between them, dust cap is fixed with the outer cover buckle of ventilation end, and the top end of ventilation end and the outside wall between the inner wall of dust cap form the ventilation passage for communicating ventilation gap and atmosphere environment, both can balance the high pressure generated by deceleration box high temperature, prevent shaft seal failure and motor ablation, dust cap can also block external impurities, and overall structure can directly replace conventional plug bolt, without modifying deceleration box, and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of forklift gearbox technology, and more specifically, to a gearbox vent cap. Background Technology

[0002] In logistics warehousing, food and beverage production, and other fields, forklifts are core material handling equipment, and their operational stability and efficiency directly affect the overall production flow. With the expansion of industry scale and capacity increase, the addition of high-speed production lines and the promotion of efficient transportation modes have led to a continuous increase in forklift operation. In some scenarios, forklifts operate at full capacity for extended periods, and the increased pallet density further increases the load pressure on forklifts, resulting in accelerated wear and tear on the forklift drive system and related components. Among these, gearbox and motor failures are particularly prominent, frequently causing equipment downtime and significantly increasing maintenance costs, becoming a key bottleneck restricting the improvement of logistics operation efficiency and cost control.

[0003] Currently, forklift gearboxes commonly use plug bolts for sealing to prevent external dust and impurities from entering the gearbox and affecting gear oil performance. However, during high-load, long-term operation of forklifts, the high-speed meshing of gears inside the gearbox generates a large amount of heat, causing the air inside the gearbox to expand and create a high-pressure environment. Simultaneously, gear oil is prone to performance degradation at high temperatures, and the high-pressure environment also exerts continuous impact on the gearbox shaft seal, easily causing seal failure and leading to gear oil leakage or external impurity intrusion. Shaft seal failure not only results in insufficient lubrication of the gearbox and accelerated gear wear, but leaked gear oil may also enter the drive motor, causing motor coil failure and ultimately motor burnout. Furthermore, existing plug bolts cannot achieve pressure balance between the inside and outside of the gearbox, and the high-pressure environment may increase the risk of gearbox housing cracking, further shortening the equipment's lifespan. Traditional maintenance methods require disassembling multiple components and sending the motor for external repair, resulting in long downtime and high repair costs. The existing gearbox sealing structure can no longer meet the reliability and economic requirements of forklifts operating under high loads. Utility Model Content

[0004] The purpose of this invention is to provide a vent cap for a gearbox, which solves the problem that existing gearboxes are prone to shaft seal failure and motor burnout due to high pressure.

[0005] This utility model is achieved through the following technical solution: a gearbox vent cap, including a rod body, one end of the rod body is provided with an external thread for threaded sealing connection to the gearbox, the other end of the rod body is provided with a vent end, the rod body is provided with a through hole along the axial direction, and a number of straight copper wires are arranged axially parallel and tightly filled in the through hole, forming a vent gap communicating with the inner cavity of the gearbox between the straight copper wires, and a dust cap is fastened to the outer cover of the vent end, and a venting channel is formed between the inner wall of the dust cap and the top and outer walls of the vent end for communicating with the vent gap and the atmospheric environment.

[0006] Furthermore, the ventilation channel includes a first channel and a second channel. Several pads are provided between the top of the ventilation end and the dust cap, and the first channel is formed between adjacent pads. The outer contour cross-section of the ventilation end is a regular polygon, and several circumferentially distributed second channels are formed between the outer wall of the ventilation end and the inner wall of the dust cap.

[0007] Furthermore, the pads are evenly spaced along the circumference of the dust cap.

[0008] Furthermore, a limiting ring is connected to the inner wall of the lower end of the through hole, and a limiting mesh is provided inside the limiting ring to abut against the bottom end of the straight copper wire.

[0009] Furthermore, the outer wall of the limiting ring is provided with a guide protrusion, and the inner wall of the through hole is provided with a positioning ring groove that engages with the guide protrusion.

[0010] Furthermore, the limiting mesh is made of steel wire mesh, and the mesh size of the limiting mesh is smaller than the maximum cross-sectional size of the straight copper wire.

[0011] Furthermore, the rod body and venting end are integrally formed from aluminum and aluminum alloy, the dust cap is made of steel, and the surface of the dust cap is covered with a chrome plating layer.

[0012] Furthermore, a hexagonal shoulder is fitted and fixed in the middle of the rod.

[0013] This utility model has at least the following advantages and beneficial effects: by using a screw with an external thread at one end and a venting end with an axial through hole at the other end, straight copper wires are tightly filled axially parallel in the through hole to form a venting gap, and a dust cap is fastened to the outside of the venting end to construct a venting channel connecting the venting gap with the atmosphere. This can balance the high pressure generated by the high temperature of the gearbox, prevent shaft seal failure and motor burnout, and block external impurities through the dust cap. Moreover, the overall structure can directly replace the traditional plug bolt without modifying the gearbox, and has strong adaptability. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a gearbox vent cap provided by this utility model.

[0015] Figure 2 This is a structural schematic diagram of a gearbox vent cap provided by this utility model.

[0016] Figure 3 This is a structural schematic diagram of a gearbox vent cap provided by this utility model.

[0017] Figure 4 This is a structural schematic diagram of a gearbox vent cap provided by this utility model.

[0018] Figure 5 This is a structural schematic diagram of a gearbox vent cap provided by this utility model.

[0019] Reference numerals: 1-rod body, 10-through hole, 11-external thread, 12-locating ring groove, 13-hexagonal shoulder, 2-ventilation end, 20-ventilation channel, 201-first channel, 202-second channel, 3-straight copper wire, 30-ventilation gap, 4-dust cap, 5-pad, 6-limiting ring, 61-limiting mesh, 62-guide protrusion ring. Detailed Implementation

[0020] The specific implementation method is described below with reference to the accompanying drawings.

[0021] Example

[0022] like Figures 1 to 5 As shown, this embodiment mainly discloses a gearbox vent cap, including a rod body 1. One end of the rod body 1 is provided with an external thread 11 for threaded sealing connection to the gearbox, and the other end of the rod body 1 is provided with a vent end 2. The rod body 1 has a through hole 10 along the axial direction. Several straight copper wires 3 are arranged axially parallel and tightly filled in the through hole 10. A vent gap 30 communicating with the inner cavity of the gearbox is formed between the straight copper wires 3. A dust cap 4 is fastened to the outer cover of the vent end 2. A venting channel 20 for communicating the vent gap 30 with the atmospheric environment is formed between the inner wall of the dust cap 4 and the top and outer walls of the vent end 2. Specifically, the rod body 1 serves as the core load-bearing structure. One end of the rod body 1 has an external thread 11 that matches the pre-set threaded hole in the gearbox housing, achieving a sealed connection. This prevents gear oil leakage and ensures that the rod body 1 is connected to the inner cavity of the gearbox. The other end of the rod body 1 has an integrally formed vent end 2, and a through cylindrical hole 10 is formed along the axial direction. The through hole 10 is filled with straight copper wires 3, which serve as filters and allow air to pass through. The straight copper wires 3 are cylindrical, and micron-level ventilation gaps 30 are naturally formed between them. The vent end 2 is externally... A cylindrical dust cap 4 with a closed top and an open bottom is tightly connected by an interference fit. A ventilation channel 20 is reserved between the inner wall of the dust cap 4 and the top and outer walls of the ventilation end 2, forming a complete airflow path from the gearbox cavity, ventilation gap 30, ventilation channel 20 to the atmosphere. This can not only balance the high pressure generated by the high temperature of the gearbox in real time, preventing shaft seal failure and motor burnout, but also block external impurities through the dust cap 4. Moreover, the overall structure can directly replace the traditional plug bolts without modifying the gearbox, making it highly adaptable.

[0023] Furthermore, in specific implementation, such as Figure 2 and Figure 4As shown, the ventilation channel 20 provided in this embodiment of the present invention includes a first channel 201 and a second channel 202. A plurality of pads 5 are provided between the top of the ventilation end 2 and the dust cap 4. The first channel 201 is formed between adjacent pads 5. The outer contour cross section of the ventilation end 2 is a regular polygon, and a plurality of circumferentially distributed second channels 202 are formed between the outer wall of the ventilation end 2 and the inner side wall of the dust cap 4. Specifically, the pad 5 is integrally formed on the top of the vent end 2. The pad 5 is distributed circumferentially around the dust cap 4, which can support the gap between the dust cap 4 and the top of the vent end 2 and prevent the dust cap 4 from deforming and blocking the channel. The outer contour of the vent end 2 is designed as a regular polygon, so that the airflow is evenly diffused circumferentially and avoids negative pressure dust suction caused by local high-speed airflow. The outer edge of the vent end 2 (the outer edge can be fitted with the inner wall of the dust cap 4 with a rounded arc) is interference-fitted with the dust cap 4. A second channel 202 is formed between the outer edge of the vent end 2 and the inner arc wall of the dust cap 4. The first channel 201 and the second channel 202 are interconnected, so that the airflow can be discharged from the inner cavity of the gearbox.

[0024] Furthermore, in specific implementation, such as Figure 4 As shown, the pads 5 provided in this embodiment of the present invention are evenly spaced around the dust cap 4, so that the flow resistance of each first channel 201 is the same, the airflow will not be biased and concentrated, and the pressure in the gearbox cavity is released synchronously, avoiding local high pressure residue that accelerates shaft seal wear. At the same time, the vibration and impact force generated by forklift operation can be evenly transmitted to the ventilation end 2 through the pads 5, preventing the dust cap 4 from cracking due to local stress or the ventilation end 2 from deforming.

[0025] Furthermore, in specific implementation, such as Figure 2 and Figure 3 As shown, in this embodiment of the present invention, a limiting ring 6 is connected to the inner wall of the lower end of the through hole 10, and a limiting mesh 61 is provided inside the limiting ring 6 to abut against the bottom end of the straight copper wire 3. To prevent the straight copper wire 3 from falling off from the lower end of the through hole 10 and contaminating the gearbox, a limiting ring 6 is connected to the inner wall of the lower end of the through hole 10 (the end closest to the gearbox). After installation, the limiting ring 6 is embedded in the rod body 1 to prevent it from extending into the inner cavity of the gearbox and affecting the gear operation. The inner ring of the limiting ring 6 is fixed with a circular limiting mesh 61 by stamping or welding to fix the axial position of the straight copper wire 3 and prevent it from shifting due to forklift vibration. At the same time, excessive compression of the straight copper wire 3 should be avoided to prevent deformation of the straight copper wire 3 and reduction of the ventilation gap 30. This ensures the stable filling density of the straight copper wire 3, and the aging straight copper wire 3 can be replaced by disassembling the limiting ring 6 without replacing the entire rod body 1, thus reducing maintenance costs.

[0026] Furthermore, in specific implementation, such as Figure 3As shown, the outer wall of the limiting ring 6 provided in this embodiment of the utility model is provided with a guide protrusion 62, and the inner wall of the through hole 10 is provided with a positioning ring groove 12 that engages with the guide protrusion 62. Specifically, the upper end face of the guide protrusion 62 is chamfered to facilitate the smooth entry of the limiting ring 6 into the through hole 10 during installation and avoid jamming. This snap-fit ​​structure does not require additional fasteners. During installation, the limiting ring 6 only needs to be aligned with the through hole 10 and pressed to complete the positioning, ensuring that the limiting ring 6 will not fall off for a long time. During disassembly, axial force is applied by a special annular pin, and the protrusion ring can be disengaged from the ring groove by utilizing the elastic deformation of the metal, achieving non-destructive disassembly and facilitating subsequent maintenance of the limiting mesh 61 or the straight copper wire 3.

[0027] Furthermore, in specific implementations, the limiting mesh 61 provided in this embodiment of the present invention is made of steel wire mesh, and the mesh size of the limiting mesh 61 is smaller than the maximum cross-sectional size of the straight copper wire 3. The limiting mesh 61 can be set to 304 stainless steel wire mesh to adapt to the oil immersion and high-temperature environment inside the gearbox: the wire diameter is 0.1-0.15mm, and it is made using an 80-100 mesh weaving process (corresponding to a mesh size of 180-200μm), and the surface is passivated to improve corrosion resistance; the straight copper wire 3 is circular (diameter 0.8-1.2mm), and the mesh size of the limiting mesh 61 is smaller than the maximum cross-sectional size of the straight copper wire 3, physically preventing the possibility of the straight copper wire 3 falling off.

[0028] Furthermore, in specific implementation, the rod body 1 and the ventilation end 2 provided in this utility model embodiment are integrally formed from aluminum and aluminum alloy materials, the dust cap 4 is made of steel, and the surface of the dust cap 4 is covered with a chrome-plated layer, taking into account lightweight, heat dissipation and durability.

[0029] Furthermore, in specific implementation, such as Figure 1 and Figure 2 As shown, a hexagonal shoulder 13 is sleeved and fixed in the middle of the rod body 1 provided in this embodiment of the utility model. Specifically, the distance between opposite sides of the hexagonal shoulder 13 is adapted to a conventional standard open-end wrench; the hexagonal shoulder 13 is coaxially arranged with the rod body 1, and a transition section is left between it and the vent end 2; at the same time, the shoulder can also assist in positioning during installation and limit the axial installation depth of the rod body 1.

Claims

1. A breather cap for a reduction gearbox, characterized in that The device includes a rod (1), one end of which is provided with an external thread (11) for threaded sealing connection to the gearbox, and the other end of which is provided with a venting end (2). The rod (1) has a through hole (10) along the axial direction. Several straight copper wires (3) are arranged axially parallel and tightly filled in the through hole (10). A venting gap (30) is formed between the straight copper wires (3) and communicates with the inner cavity of the gearbox. A dust cap (4) is fastened to the outer cover of the venting end (2). A ventilation channel (20) is formed between the inner wall of the dust cap (4) and the top and outer walls of the venting end (2) for communicating with the ventilation gap (30) and the atmospheric environment.

2. A breather cap for a reduction gearbox according to claim 1, characterised in that The ventilation channel (20) includes a first channel (201) and a second channel (202). A plurality of pads (5) are provided between the top of the ventilation end (2) and the dust cap (4). The first channel (201) is formed between adjacent pads (5). The outer contour cross section of the ventilation end (2) is a regular polygon, and a plurality of circumferentially distributed second channels (202) are formed between the outer wall of the ventilation end (2) and the inner side wall of the dust cap (4).

3. A gearbox vent cap according to claim 2, characterized in that, The pads (5) are evenly spaced along the circumference of the dust cap (4).

4. A breather cap for a reduction gearbox according to claim 1, characterised in that The lower end of the through hole (10) is connected to a limiting ring (6), and a limiting mesh (61) is provided inside the limiting ring (6) to abut against the bottom end of the straight copper wire (3).

5. A breather cap for a reduction gearbox as claimed in claim 4, characterised in that, The outer wall of the limiting ring (6) is provided with a guide protrusion (62), and the inner wall of the through hole (10) is provided with a positioning ring groove (12) that engages with the guide protrusion (62).

6. A breather cap for a reduction gearbox as claimed in claim 4, characterised in that, The limiting mesh (61) is made of steel wire mesh, and the mesh size of the limiting mesh (61) is smaller than the maximum cross-sectional size of the straight copper wire (3).

7. A breather cap for a reduction gearbox according to claim 1, characterised in that The rod body (1) and the ventilation end (2) are integrally formed from aluminum and aluminum alloy materials, the dust cap (4) is made of steel, and the surface of the dust cap (4) is covered with a chrome plating layer.

8. A breather cap for a reduction gearbox according to claim 1, characterised in that The rod (1) is fitted with a hexagonal shoulder (13) in the middle.

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