A gear box input end sealing device
By designing a composite sealing ring and an automatic adjustment system at the gearbox input end, the problem of decreased sealing performance was solved, real-time monitoring and automatic adjustment of the sealing structure were realized, the sealing life was extended, and the stable operation of the gearbox was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-09-17
- Publication Date
- 2026-07-10
AI Technical Summary
Existing gearbox input end sealing devices suffer from reduced sealing performance due to friction and wear, aging of sealing materials, or operating conditions during long-term operation. This leads to lubricant leakage and contaminant intrusion, affecting the gearbox's lifespan and stability. Furthermore, early signs of these issues are often difficult to detect.
A sealing device comprising a composite sealing ring, a pressure detection plate, a microcontroller unit, and an alarm was designed. By monitoring the pressure changes of the sealing structure in real time, the device automatically adjusts the sealing gap and triggers an alarm, enabling timely repair or replacement of the sealing structure and improving sealing stability.
It enables real-time monitoring and automatic adjustment of the sealing structure, timely alarm, extended seal life, reduced lubricant leakage and contaminant intrusion, and ensures stable operation of the gearbox.
Smart Images
Figure CN224479266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sealing device technology, and in particular to a sealing device for the input end of a gearbox. Background Technology
[0002] Gearboxes are core components of mechanical transmission systems, transmitting power, converting speeds, adjusting torque, or changing the direction of motion through gear meshing. They are widely used in industrial machinery, transportation vehicles, and new energy equipment. During gearbox operation, sealing devices are typically used to seal the input end of the gearbox to prevent lubricating oil leakage, block external contaminants, maintain stable internal pressure, and ensure transmission efficiency and safety. The gearbox input end sealing device is a critical component for preventing lubricating oil leakage and blocking external dust, moisture, and other impurities from entering; its performance directly affects the gearbox's lifespan and operational stability.
[0003] However, existing input sealing devices may experience a decline in sealing performance over long-term operation due to friction and wear, aging of sealing materials, or factors such as dust and moisture in the operating environment. Although conventional seals can be replaced to restore sealing function, early signs of wear may not be easily detected in some equipment with complex operating environments or long maintenance cycles. If not addressed in time, this can lead to lubricant leakage and contaminant intrusion, thereby affecting the service life and operational stability of the gearbox. Utility Model Content
[0004] Therefore, the purpose of this utility model is to propose a gearbox input end sealing device to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.
[0005] To achieve the above objectives, one embodiment of this utility model provides a gearbox input end sealing device, including a gearbox for mechanical transmission. An input shaft connected to an internal gear set is disposed inside the gearbox. A composite sealing ring forming a labyrinth seal structure is disposed on the surface of the input shaft. A pressure detection plate for detecting internal pressure is disposed inside the composite sealing ring. The pressure detection plate is signal-connected to a microcontroller unit (MCU) for signal processing and automated control. The MCU is signal-connected to an alarm device. The MCU is electrically connected to a battery for power supply. Both the MCU and the battery are disposed inside the gearbox. The battery also powers the alarm device. An independent control system is formed within the MCU to process the pressure signal and control the alarm device to sound an alarm based on the pressure signal. An elastic fastening ring for deformation adjustment is disposed in the middle of the surface of the composite sealing ring. A fastening rod for tension adjustment is disposed at one end of the elastic fastening ring. A drive plate for pulling is fixedly installed at one end of the fastening rod.
[0006] Preferably, in any of the above embodiments, the gearbox is provided with a gear set for mechanical transmission, the gear set and the input shaft are fixedly installed, one end of the gearbox is fixedly installed with a sealing seat for sealing, and one end of the sealing seat is fixedly installed with a detachable end cover for sealing and fixing.
[0007] The above technical solution is adopted: the gear set inside the gearbox (cast iron material) is interference-fitted with the input shaft (45# steel quenched and tempered) to realize power transmission. The sealing seat (aluminum alloy material, anodized surface) is fixed to one end of the gearbox by bolts. An oil-resistant rubber gasket is set on the end face of the sealing seat and the contact surface of the gearbox to ensure sealing stability. The end cover (ABS material) is connected to the end of the sealing seat by a snap-fit, which facilitates the internal structure maintenance.
[0008] Preferably, in any of the above embodiments, the composite sealing ring includes a fixed-position sealing outer ring and a rotating sealing inner ring. The sealing outer ring is fixedly installed inside the sealing seat, and the sealing inner ring, which is fixedly installed on the input shaft, is rotatably connected inside the sealing outer ring. The sealing inner ring and the input shaft are interference-fitted.
[0009] The above technical solution is adopted: the outer sealing ring (made of polytetrafluoroethylene with 15% carbon fiber) is fixed in the inner hole of the sealing seat, and an annular labyrinth groove is machined on its inner surface. The inner sealing ring (wear-resistant cast iron with chrome plating) is interference-fitted with the input shaft and rotates synchronously with the input shaft. The outer surface of the inner sealing ring is correspondingly machined with a raised ring. The two form a labyrinth seal structure. When the lubricating oil passes through the labyrinth groove, the resistance generated by the tortuous path reduces the leakage and at the same time prevents external dust from entering.
[0010] Preferably, in any of the above embodiments, the pressure detection piece includes a pressure sensor connected to a microcontroller unit and a pressure-bearing extrusion piece. The pressure sensor is fixedly installed inside the sealing outer ring, and the extrusion piece located inside the sealing outer ring is fixedly installed at the detection end of the pressure sensor. The extrusion piece and the surface of the sealing inner ring are in contact.
[0011] The above technical solution is adopted: the pressure sensor is fixed in the mounting groove of the sealing outer ring, and the detection end is connected to the extrusion plate (brass material). The extrusion plate is elastically attached to the outer surface of the sealing inner ring. When the input shaft rotates, the pressure fluctuates due to the change in gap between the sealing inner ring and the extrusion plate, which ensures the stability of the pressure during sealing. When the seal wears, the pressure drops sharply, and the sensor transmits the signal to the microcontroller unit to realize the prediction of seal failure.
[0012] Preferably, in any of the above embodiments, the alarm is fixedly installed at one end of the sealing seat, the elastic fastening ring is located inside the sealing seat, the elastic fastening ring is fitted onto the surface of the outer sealing ring, and the two ends of the elastic fastening ring are provided with connecting blocks for fastening and pulling.
[0013] The above technical solution is adopted: the alarm (buzzer + LED indicator) is fixed to the outer end of the sealing seat and receives the signal from the micro-control unit. When the pressure detection value is lower than the threshold, the buzzer sounds an alarm and the indicator flashes to indicate seal wear. The elastic fastening ring (spring steel) is C-shaped and fits into the outer sealing ring. The connecting blocks at both ends transmit the tension through the fastening rod. Its elastic deformation can squeeze the outer sealing ring to deform slightly, reduce the gap with the inner sealing ring, and temporarily enhance the seal.
[0014] Preferably, in any of the above embodiments, the fastening rod is inserted into the drive plate through the connecting block, and one end of the fastening rod has a fastening groove that engages and fixes with the drive plate.
[0015] The above technical solution is adopted: the fastening rod (made of stainless steel) passes through the connecting block of the elastic fastening ring, and the fastening groove at one end engages with the movable block of the drive plate, so as to linearly transmit the pulling force of the drive plate to the elastic fastening ring, so that it grips the sealing outer ring tightly. The surface of the rod is chrome plated to reduce the frictional resistance when pulling and ensure the efficiency of force transmission.
[0016] Preferably, in any of the above embodiments, the drive board includes an electric telescopic rod connected to a microcontroller unit, a pull seat for transmission, a fastening spring for support, and a movable locking block for engaging the fastening pull rod. The electric telescopic rod is fixedly installed inside the sealing seat. One end of the electric telescopic rod is fixedly installed with a pull seat that moves inside the sealing seat. The pull seat is fixedly installed with a fastening spring inside. One end of the fastening spring is fixedly installed with a movable locking block that moves inside the pull seat. The movable locking block engages with the fastening pull rod.
[0017] The above technical solution is adopted: the electric telescopic rod is controlled by a microcontroller unit, the output end of which is connected to the pull seat (aluminum alloy material). The movable locking block (nylon material) is embedded into the fastening groove of the fastening rod under the push of the fastening spring, forming a rigid connection. When the microcontroller unit detects that the pressure is lower than the threshold (when no alarm is triggered), it controls the electric telescopic rod to extend, pulls the fastening rod to make the elastic fastening ring hug the sealing outer ring until the pressure rises back to the normal range. After the alarm is triggered, the adjustment stops and waits for manual maintenance. The fastening spring can compensate for the assembly error of the rod and the locking block to ensure reliable engagement.
[0018] The gear set inside the gearbox is linked to the input shaft. The sealing seat is fixed with bolts to form a basic seal. The outer sealing ring of the composite sealing ring is fixed to the sealing seat, and the inner sealing ring rotates with the input shaft to form a labyrinth seal. The pressure detection plate's extrusion plate is attached to the inner sealing ring. The pressure sensor transmits the pressure signal to the microcontroller unit. If the microcontroller unit detects an abnormal pressure, it controls the alarm to sound and simultaneously controls the electric telescopic rod of the drive board to drive the pull seat. Through the movable locking block, the fastening rod is pulled, causing the elastic fastening ring to tighten the outer sealing ring, reducing the sealing gap. The fastening spring ensures that the movable locking block and the fastening rod are reliably engaged, ensuring stable seal adjustment.
[0019] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:
[0020] 1. A pressure detection plate is installed inside the labyrinth-type composite sealing ring to detect the internal pressure of the composite sealing ring. The pressure between the internal structures of the composite sealing ring is monitored in real time during operation. According to the structural properties of the composite sealing ring itself, when it is damaged, the pressure between the structures at the damaged point will decrease due to the damage. Based on the pressure change information detected by the pressure detection plate, the damage to the sealing structure can be quickly determined, and the alarm can be activated to facilitate timely repair or replacement of the damaged sealing structure, thereby improving the stability of the sealing structure in use.
[0021] 2. An adjustable elastic fastening ring is installed on the surface of the sealing outer ring, and automatic tightening adjustment is achieved through the drive plate and fastening rod. When an increase in the sealing gap is detected, the sealing gap can be temporarily reduced to improve sealing performance, delay further failure, and buy time for subsequent maintenance.
[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0024] Figure 1 This is a schematic diagram of the structure according to an embodiment of the present utility model;
[0025] Figure 2 This is a partial structural schematic diagram according to an embodiment of the present utility model;
[0026] Figure 3 This is a schematic diagram of the composite sealing ring according to an embodiment of the present invention;
[0027] Figure 4 This is a cross-sectional structural diagram of the composite sealing ring according to an embodiment of the present invention;
[0028] Figure 5 This is a cross-sectional structural diagram of the drive board according to an embodiment of the present utility model;
[0029] Among them: 1-Gearbox, 2-Input shaft, 3-Composite sealing ring, 31-Sealing outer ring, 32-Sealing inner ring, 4-Pressure detection plate, 41-Pressure sensor, 42-Squeezing plate, 5-Alarm, 6-Elastic fastening ring, 7-Fastening rod, 8-Drive plate, 81-Electric telescopic rod, 82-Pull seat, 83-Fastening spring, 84-Moving block, 9-Sealing seat. Detailed Implementation
[0030] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.
[0031] like Figure 1-5 As shown, an embodiment of the present invention provides a gearbox input end sealing device, comprising a gearbox 1 for mechanical transmission, an input shaft 2 connected to an internal gear set, a composite sealing ring 3 forming a labyrinth seal structure on the surface of the input shaft 2, a pressure detection plate 4 for detecting internal pressure inside the composite sealing ring 3, a microcontroller unit (MCU) for signal processing and automated control connected to the pressure detection plate 4, an alarm 5 for alarm activation connected to the MCU, and a battery for powering the MCU. Both the MCU and the battery are located inside the gearbox 1, and the battery also powers the alarm. The MCU forms an independent control system that processes the pressure signal and controls the alarm to sound an alarm based on the pressure signal. An elastic fastening ring 6 for deformation adjustment is provided in the middle of the surface of the composite sealing ring 3, a fastening rod 7 for tension adjustment is provided at one end of the elastic fastening ring 6, and a drive plate 8 for pulling is fixedly installed at one end of the fastening rod 7.
[0032] Preferably, in any of the above schemes, the gearbox 1 is provided with a gear set for mechanical transmission, the gear set and the input shaft 2 are fixedly installed, and a sealing seat 9 for sealing is fixedly installed at one end of the gearbox 1 by bolts, and a disassembly end cover for sealing and fixing is fixedly installed at one end of the sealing seat 9.
[0033] The above technical solution is adopted: the gear set inside the gearbox 1 (cast iron material) is interference-fitted with the input shaft 2 (45# steel quenched and tempered) to realize power transmission. The sealing seat 9 (aluminum alloy material, anodized surface) is fixed to one end of the gearbox by bolts. An oil-resistant rubber gasket is set on the end face of the sealing seat and the contact surface of the gearbox to ensure sealing stability. The end cover (ABS material) is connected to the end of the sealing seat by a snap-fit, which facilitates the internal structure maintenance.
[0034] Preferably, in any of the above embodiments, the composite sealing ring 3 includes a fixed sealing outer ring 31 and a rotating sealing inner ring 32. The sealing outer ring 31 is fixedly installed inside the sealing seat 9, and the sealing inner ring 32, which is fixedly installed to the input shaft 2, is rotatably connected inside the sealing outer ring 31. The sealing inner ring 32 and the input shaft 2 are interference-fitted.
[0035] The above technical solution is adopted: the outer sealing ring 31 (made of polytetrafluoroethylene with 15% carbon fiber) is fixed in the inner hole of the sealing seat 9, and an annular labyrinth groove is machined on its inner surface. The inner sealing ring 32 (wear-resistant cast iron with chrome plating) is interference-fitted with the input shaft 2 and rotates synchronously with the input shaft. The outer surface of the inner sealing ring is correspondingly machined with a raised ring. The two form a labyrinth seal structure. When the lubricating oil passes through the labyrinth groove, the resistance is generated due to the tortuous path, which reduces the leakage and at the same time prevents external dust from entering.
[0036] Preferably, in any of the above schemes, the pressure detection piece 4 includes a pressure sensor 41 connected to the microcontroller unit and a pressure-bearing extrusion piece 42. The pressure sensor 41 is fixedly installed inside the sealing outer ring 31, and the extrusion piece 42 located inside the sealing outer ring 31 is fixedly installed at the detection end of the pressure sensor 41. The surfaces of the extrusion piece 42 and the sealing inner ring 32 are in contact.
[0037] The above technical solution is adopted: the pressure sensor 41 is fixed in the mounting groove of the sealing outer ring 31, and the detection end is connected to the extrusion plate 42 (brass material). The extrusion plate is elastically attached to the outer surface of the sealing inner ring 32. When the input shaft rotates, the pressure fluctuation between the sealing inner ring and the extrusion plate is generated due to the change of gap, which ensures the stability of the pressure during sealing. When the seal wears, the pressure drops sharply, and the sensor transmits the signal to the micro-control unit to realize the prediction of seal failure.
[0038] Preferably, in any of the above schemes, the alarm 5 is fixedly installed at one end of the sealing seat 9, the elastic fastening ring 6 is located inside the sealing seat 9, the elastic fastening ring 6 is fitted onto the surface of the sealing outer ring 31, and the two ends of the elastic fastening ring 6 are provided with connecting blocks for fastening and pulling.
[0039] The above technical solution is adopted: the alarm 5 (buzzer + LED indicator) is fixed to the outer end of the sealing seat 9 and receives the signal from the micro-control unit. When the pressure detection value is lower than the threshold, the buzzer sounds an alarm and the indicator flashes to indicate seal wear. The elastic fastening ring 6 (spring steel) is C-shaped and fits into the sealing outer ring 31. The connecting blocks at both ends transmit the tension through the fastening rod 7. Its elastic deformation can squeeze the sealing outer ring to deform slightly, reduce the gap with the sealing inner ring, and temporarily enhance the seal.
[0040] Preferably, in any of the above solutions, the fastening rod 7 is inserted into the drive plate 8 through the connecting block, and one end of the fastening rod 7 is provided with a fastening groove that engages and fixes with the drive plate 8.
[0041] The above technical solution is adopted: the fastening rod 7 (stainless steel material) passes through the connecting block of the elastic fastening ring 6, and the fastening groove at one end engages with the movable locking block 84 of the drive plate 8, so as to linearly transmit the pulling force of the drive plate to the elastic fastening ring, so that it grips the sealing outer ring tightly. The surface of the rod is chrome plated to reduce the frictional resistance when pulling and ensure the force transmission efficiency.
[0042] Preferably, in any of the above embodiments, the drive plate 8 includes an electric telescopic rod 81 connected to the microcontroller unit, a pull seat 82 for transmission, a fastening spring 83 for support, and a movable locking block 84 for engaging the fastening rod 7. The electric telescopic rod 81 is fixedly installed inside the sealing seat 9. One end of the electric telescopic rod 81 is fixedly installed with the pull seat 82 that moves inside the sealing seat 9. The fastening spring 83 is fixedly installed inside the pull seat 82. One end of the fastening spring 83 is fixedly installed with the movable locking block 84 that moves inside the pull seat 82. The movable locking block 84 engages with the fastening rod 7.
[0043] The above technical solution is adopted: the electric telescopic rod 81 is controlled by the microcontroller unit, and its output end is connected to the pull seat 82 (aluminum alloy material). The movable locking block 84 (nylon material) is embedded into the fastening groove of the fastening rod 7 under the push of the fastening spring 83 to form a rigid connection. When the microcontroller unit detects that the pressure is lower than the threshold (when no alarm is triggered), it controls the electric telescopic rod to extend and pull the fastening rod to make the elastic fastening ring hug the sealing outer ring until the pressure rises back to the normal range. After the alarm is triggered, the adjustment stops and waits for manual maintenance. The fastening spring can compensate for the assembly error of the rod and the locking block to ensure reliable engagement.
[0044] The working principle of the gearbox input end sealing device of this utility model is as follows:
[0045] When the input shaft rotates, the labyrinth structure of the composite sealing ring 3 achieves basic sealing. The pressure detection plate 4 monitors the sealing gap pressure in real time, and the signal is transmitted to the microcontroller unit. When the pressure drops slightly (without exceeding the limit), the microcontroller unit drives the drive plate 8 to pull the elastic fastening ring 6 through the fastening rod 7, squeezing the outer sealing ring to reduce the gap and restore the sealing performance. When the pressure drops sharply and exceeds the limit, the microcontroller unit triggers the alarm 5 to alert for manual maintenance. The entire process is controlled through a closed loop of "detection-adjustment-early warning" to extend the sealing life.
[0046] Compared with the prior art, the present invention has the following advantages:
[0047] 1. A pressure detection plate 4 is installed inside the labyrinth-type composite sealing ring 3 to detect the internal pressure of the composite sealing ring 3. The pressure between the internal structures of the composite sealing ring 3 is monitored in real time during operation. According to the structural properties of the composite sealing ring 3 itself, when it is damaged, the pressure between the structures at the damaged point will decrease due to the damage. Based on the pressure change information detected by the pressure detection plate 4, the damage to the sealing structure can be quickly determined, and the alarm 5 can be controlled to sound an alarm. This facilitates timely repair or replacement of the damaged sealing structure and improves the stability of the sealing structure in use.
[0048] 2. An adjustable elastic fastening ring 6 is set on the surface of the sealing outer ring, and automatic tightening adjustment is achieved through the drive plate 8 and the fastening rod 7. When the sealing gap is detected to increase, the sealing gap can be temporarily reduced to improve the sealing performance, delay further failure, and buy time for subsequent maintenance.
Claims
1. A gearbox input end sealing device, comprising a gearbox (1) for mechanical transmission, wherein an input shaft (2) connected to an internal gear set is provided inside the gearbox (1), characterized in that: The surface of the input shaft (2) is provided with a composite sealing ring (3) forming a labyrinth seal structure. The interior of the composite sealing ring (3) is provided with a pressure detection plate (4) for detecting the internal pressure. The pressure detection plate (4) is connected to a microcontroller unit for signal processing and automatic control. The microcontroller unit is connected to an alarm (5) for alarm. The middle part of the surface of the composite sealing ring (3) is provided with an elastic fastening ring (6) for adjusting its deformation. One end of the elastic fastening ring (6) is provided with a fastening rod (7) for adjusting its tension. One end of the fastening rod (7) is fixedly installed with a drive plate (8) for pulling it.
2. The gearbox input end sealing device as described in claim 1, characterized in that: The gearbox (1) is equipped with a gear set for mechanical transmission. The gear set and the input shaft (2) are fixedly installed. One end of the gearbox (1) is fixedly installed with a sealing seat (9) for sealing. One end of the sealing seat (9) is fixedly installed with a disassembly end cover for sealing.
3. The gearbox input end sealing device as described in claim 2, characterized in that: The composite sealing ring (3) includes a fixed sealing outer ring (31) and a rotating sealing inner ring (32). The sealing outer ring (31) is fixedly installed inside the sealing seat (9). The sealing outer ring (31) is rotatably connected to the sealing inner ring (32) which is fixedly installed with the input shaft (2). The sealing inner ring (32) and the input shaft (2) are interference fit.
4. The gearbox input end sealing device as described in claim 3, characterized in that: The pressure detection piece (4) includes a pressure sensor (41) connected to the microcontroller unit and a pressure-bearing extrusion piece (42). The pressure sensor (41) is fixedly installed inside the sealing outer ring (31). The detection end of the pressure sensor (41) is fixedly installed with the extrusion piece (42) located inside the sealing outer ring (31). The extrusion piece (42) and the surface of the sealing inner ring (32) are in contact.
5. A gearbox input end sealing device as described in claim 4, characterized in that: The alarm (5) is fixedly installed at one end of the sealing seat (9). The elastic fastening ring (6) is located inside the sealing seat (9). The elastic fastening ring (6) fits onto the surface of the sealing outer ring (31). Connecting blocks are provided at both ends of the elastic fastening ring (6) to fasten and pull it.
6. A gearbox input end sealing device as described in claim 5, characterized in that: The fastening rod (7) is inserted into the drive plate (8) through the connecting block, and one end of the fastening rod (7) is provided with a fastening groove that engages and fixes with the drive plate (8).
7. A gearbox input end sealing device as described in claim 6, characterized in that: The drive plate (8) includes an electric telescopic rod (81) connected to the microcontroller unit, a pull seat (82) for transmission, a fastening spring (83) for support, and a movable locking block (84) for engaging the fastening rod (7). The electric telescopic rod (81) is fixedly installed inside the sealing seat (9). One end of the electric telescopic rod (81) is fixedly installed with a pull seat (82) that moves inside the sealing seat (9). The pull seat (82) is fixedly installed with a fastening spring (83). One end of the fastening spring (83) is fixedly installed with a movable locking block (84) that moves inside the pull seat (82). The movable locking block (84) engages with the fastening rod (7).