Planetary gearbox oil supply mechanism

Abstract

This invention proposes a planetary gearbox oil supply mechanism, including an oil supply pump, an end cover, gears, an oil inlet pipe, and an oil outlet pipe. The end cover is fixedly connected to the front of the oil supply pump, and two meshing gears are movably connected inside the pump. The advantages of this invention are: reducing the possibility of cavitation and air intake, thus effectively reducing the noise generated during operation. Simultaneously, a small flexible coupling is added between the output shaft of the drive motor and the second sprocket. This coupling contains several elastic blocks. Chain drives are characterized by a polygonal effect, generating periodic impact torques and vibrations. The flexible coupling effectively absorbs these high-frequency instantaneous impact energies, significantly reducing the excitation force transmitted to the first sprocket and internal gears of the oil supply pump. This directly reduces the generation of mechanical meshing vibration noise (gear and bearing noise) at its source. Therefore, the noise generated during the operation of this device is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of planetary gearbox oil supply technology, and in particular to a planetary gearbox oil supply mechanism. Background Technology

[0002] Planetary gearboxes, with their compact structure, large transmission ratio, and high load-bearing capacity, are widely used in key fields such as wind power, construction machinery, marine propulsion, and heavy industrial transmission systems. To ensure the reliable operation and long service life of their core components, such as the planetary gear train, sun gear, ring gear, and support bearings, under high-speed, heavy-load conditions, continuous, stable, and efficient lubrication is crucial. Existing planetary gearboxes are typically equipped with independent forced lubrication systems, one of the core components of which is the oil pump (usually a gear pump or a similar positive displacement pump). These oil supply systems draw lubricating oil (or grease) from the tank or low-level reservoir, pressurize it, and then deliver it through pipelines to the critical lubrication points within the gearbox.

[0003] However, the widely used planetary gearbox oil supply mechanism (especially the common structure of external gear pump drive devices) suffers from significant noise problems in practice, becoming a prominent defect affecting the working environment and equipment experience. This problem mainly manifests in the following two interrelated aspects:

[0004] Fluid noise and cavitation noise: Traditional designs connect a straight pipe directly to the oil inlet of the oil pump or use an unreasonable inlet structure. Under conditions such as high pump speeds or high oil viscosity, this design easily generates excessively high local flow velocities and severe turbulence in the pump inlet area. This not only leads to significant hydrodynamic noise (manifested as a whistling sound), but more importantly, it drastically reduces the effective suction pressure at the pump inlet, easily inducing cavitation (oil-air mixing) and cavitation effects within the oil. When cavitation occurs, air bubbles in the oil collapse instantaneously in the high-pressure area, producing a highly penetrating high-frequency hissing or popping sound.

[0005] Mechanical Vibration and Meshing Noise: Oil pumps are typically driven by asynchronous motors, with power transmitted to the pump via chain drive (due to its ease of maintenance and flexible center distance). However, the inherent polygonal effect of chain drives is unavoidable. This causes the force exerted on the chain by the drive sprocket to be transmitted non-uniformly and continuously, instead generating periodic impact torques and instantaneous vibrations at each chain link engagement. In traditional rigid connection schemes (such as the motor output shaft directly driving the sprocket via a key or flange), these high-frequency impacts and vibrations are transmitted almost unaffected directly to the main drive shaft of the oil pump (the first sprocket and its coaxial gear). This excitation force significantly exacerbates the internal vibrations within the oil pump.

[0006] The vibration and noise generated by the support bearings under impact loads during high-speed operation. The resonance noise of the pump body and frame. Ultimately, this manifests as an annoying, complex mechanical roaring or whistling noise produced by the overall oil supply mechanism during operation. Utility Model Content

[0007] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0008] Therefore, one objective of this utility model is to provide a planetary gearbox oil supply mechanism to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0009] To achieve the above objectives, one embodiment of the present invention provides a planetary gearbox oil supply mechanism, including an oil supply pump, an end cover, gears, an oil inlet pipe, and an oil outlet pipe. The end cover is fixedly connected to the front of the oil supply pump, and two meshing gears are movably connected inside the oil supply pump.

[0010] The input end of the oil supply pump is fixedly connected to an oil inlet pipe, and the output end of the oil supply pump is fixedly connected to an oil outlet pipe.

[0011] The outer end of the oil inlet pipe is fixedly connected to a flared opening with a gradually increasing diameter from the outside to the inside;

[0012] The power input end of the oil pump is fixedly connected to a first sprocket, and the first sprocket is coaxially linked with a gear.

[0013] A chain is movably connected to the outer surface of the first sprocket, and a second sprocket is movably connected to the inner side of the chain;

[0014] A motor is installed on the side of the oil pump, and the output end of the motor is connected to the second sprocket through a flexible coupling. Several elastic blocks are embedded in the middle section of the flexible coupling.

[0015] Preferably, in any of the above embodiments, the oil supply pump is a gear pump, and a mounting base is fixedly connected to the bottom of the oil supply pump.

[0016] The above technical solution is adopted: This device is specifically used for oil supply to planetary gearboxes. The motor provides power, the second sprocket drives the first sprocket to rotate through the chain, the first sprocket drives the two gears to rotate, and the gears generate negative pressure when they rotate. The oil inlet pipe is connected to the oil source to supply oil, and the oil outlet pipe is connected to the gearbox to supply oil.

[0017] Preferably, in any of the above embodiments, the gears are distributed vertically, and the connections between the oil inlet pipe, the oil outlet pipe, and the oil supply pump are all filled with rubber sealing rings.

[0018] The core structure of this device consists of: a bell mouth, a first sprocket, a second sprocket, a chain, a motor, a flexible coupling, and an elastic block.

[0019] A bell-shaped flow guide, also called a flow collector, is added to the oil inlet pipe. Its inner wall is smooth. The material can be engineering plastic or stainless steel. This addresses fluid noise (cavitation, turbulence noise). This significantly reduces the inlet oil velocity, decreases local resistance, improves the inlet flow pattern, and allows the oil to enter the pump chamber more smoothly. Reducing the flow velocity and minimizing eddies helps increase the effective suction pressure and reduces the possibility of cavitation and air pockets (cavitation collapse is one of the main sources of high-frequency hissing or popping sounds). This effectively reduces the noise generated during the operation of this mechanism.

[0020] Simultaneously, a small flexible coupling is added between the output shaft of the drive motor and the second sprocket. This coupling contains several elastic blocks. Chain drives exhibit a polygonal effect, generating periodic impact torques and vibrations. The flexible coupling effectively absorbs these high-frequency, instantaneous impact energies, significantly reducing the excitation force transmitted to the first sprocket and internal gears of the oil pump. This directly reduces mechanical meshing vibration noise (gear and bearing noise) at its source. Consequently, the noise generated during the operation of this device is greatly reduced.

[0021] Preferably, in any of the above embodiments, the inner wall of the flared opening is smooth, and the flared opening is welded to the oil inlet pipe.

[0022] The core design of the device is as follows: the outer end of the oil inlet pipe is welded with a flared mouth (collector) with a smooth inner wall, made of engineering plastic or stainless steel. Its diameter gradually increases from the outside to the inside to achieve flow field optimization.

[0023] The first sprocket is fixed to the power input end of the oil pump and is coaxially linked with a gear. The chain simultaneously meshes with the first and second sprockets. The motor output end is connected to the second sprocket via a flexible coupling. This coupling consists of two rigid ends and a central elastic layer. Several elastic blocks are embedded in the elastic layer, and it is fixed to the motor and the second sprocket by fasteners.

[0024] Preferably, in any of the above embodiments, the flexible coupling is divided into three parts, with both ends of the flexible coupling being rigid and the central interlayer being elastic.

[0025] Preferably, in any of the above solutions, the flexible coupling is connected to the motor output end and the corresponding part of the second sprocket via a number of fasteners.

[0026] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0027] The planetary gearbox oil supply mechanism incorporates a bell-shaped guide in the oil inlet pipe, with a smooth inner wall; this is also called a collector. The material can be engineering plastic or stainless steel. This design addresses fluid noise (cavitation, turbulence noise). It significantly reduces the inlet oil velocity, decreases local resistance, improves the inlet flow pattern, and allows the oil to enter the pump chamber more smoothly. Lowering the flow velocity and reducing eddies helps increase the effective suction pressure and reduces the likelihood of cavitation and air pockets (cavitation collapse is one of the main sources of high-frequency hissing or popping sounds). This effectively reduces the noise generated during the operation of this mechanism.

[0028] Simultaneously, a small flexible coupling is added between the output shaft of the drive motor and the second sprocket. This coupling contains several elastic blocks. Chain drives exhibit a polygonal effect, generating periodic impact torques and vibrations. The flexible coupling effectively absorbs these high-frequency, instantaneous impact energies, significantly reducing the excitation force transmitted to the first sprocket and internal gears of the oil pump. This directly reduces mechanical meshing vibration noise (gear and bearing noise) at its source. Consequently, the noise generated during the operation of this device is greatly reduced.

[0029] 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

[0030] 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:

[0031] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0032] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0033] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0034] Figure 4 This is a schematic diagram of the internal gear structure of this utility model.

[0035] In the diagram: 1-oil pump, 2-end cover, 3-gear, 4-oil inlet pipe, 5-oil outlet pipe, 6-flare mouth, 7-first sprocket, 8-chain, 9-second sprocket, 10-motor, 11-flexible coupling, 12-flexible block. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] like Figure 1-4 As shown, the oil supply mechanism of this planetary gearbox includes an oil supply pump 1, an end cover 2, gears 3, an oil inlet pipe 4, and an oil outlet pipe 5. The end cover 2 is fixedly connected to the front of the oil supply pump 1, and two meshing gears 3 are movably connected inside the oil supply pump 1.

[0039] An oil inlet pipe 4 is fixedly connected to the input end of the oil supply pump 1, and an oil outlet pipe 5 is fixedly connected to the output end of the oil supply pump 1.

[0040] The outer end of the oil inlet pipe 4 is fixedly connected to a bell mouth 6 whose diameter gradually increases from the outside to the inside;

[0041] The power input end of the oil pump 1 is fixedly connected to a first sprocket 7, and the first sprocket 7 is coaxially linked with a gear 3.

[0042] The outer surface of the first sprocket 7 is movably connected to the chain 8, and the inner side of the chain 8 is movably connected to the second sprocket 9;

[0043] A motor 10 is installed on the side of the oil pump 1. The output end of the motor 10 is connected to the second sprocket 9 through a flexible coupling 11. Several elastic blocks 12 are embedded in the middle section of the flexible coupling 11.

[0044] Example 1: The oil supply pump 1 is specifically a gear pump, and a mounting base is fixedly connected to the bottom of the oil supply pump 1. Gears 3 are distributed vertically, and rubber sealing rings are filled at the connection points between the oil inlet pipe 4, the oil outlet pipe 5, and the oil supply pump 1. The inner wall of the bell mouth 6 is smooth, and the bell mouth 6 is welded to the oil inlet pipe 4. The flexible coupling 11 is divided into three parts, with rigid ends and an elastic central interlayer. The flexible coupling 11 is connected to the output end of the motor 10 and the corresponding part of the second sprocket 9 by several fasteners.

[0045] Example 2: This device is specifically designed for oil supply to a planetary gearbox. Power is primarily provided by motor 10. The second sprocket 9 drives the first sprocket 7 to rotate via chain 8. The first sprocket 7 then drives two gears 3 to rotate. The rotation of the gears 3 generates negative pressure. The oil inlet pipe 4 connects to an oil source for oil intake, and the oil outlet pipe 5 connects to the gearbox for oil delivery. Core design: The outer end of the oil inlet pipe 4 is welded with a smooth-walled flared opening 6 (collector), made of engineering plastic or stainless steel. Its diameter gradually increases from the outside to the inside to optimize the flow field.

[0046] The first sprocket 7 is fixed to the power input end of the oil pump 1 and is coaxially linked with a gear 3. The chain 8 simultaneously meshes with the first sprocket 7 and the second sprocket 9. The output end of the motor 10 is connected to the second sprocket 9 through an elastic coupling 11. The coupling 11 consists of two rigid ends and a middle elastic layer. Several elastic blocks 12 are embedded in the elastic layer and are fixed to the motor 10 and the second sprocket 9 by fasteners.

[0047] The working principle of this utility model is as follows:

[0048] Power transmission: After the motor 10 starts, the power is buffered by the elastic block 12 in the middle of the flexible coupling 11, driving the second sprocket 9 to rotate → driving the first sprocket 7 to rotate through the chain 8 → and then rotating the gear 3 in the oil pump 1. The flexible coupling 11 effectively absorbs the periodic impact of the chain 8 caused by the polygonal effect, suppressing the transmission of vibration to the gear 3.

[0049] Oil supply process: When gear 3 rotates, a negative pressure is formed at the oil inlet. Oil is smoothly introduced from the oil source through the bell mouth 6 (its gradually expanding structure reduces flow velocity and eddies), and then enters the oil supply pump 1 chamber through the oil inlet pipe 4. Under the squeezing action of gear 3, the pressurized oil is delivered to the planetary gearbox from the oil outlet pipe 5.

[0050] Noise reduction mechanism: Fluid noise reduction: The smooth and gradually expanding design of the horn 6 significantly reduces the oil inlet flow rate (>30%), improves the flow pattern, suppresses cavitation and turbulence noise, and eliminates high-frequency "hissing" sound.

[0051] Mechanical noise reduction: The flexible coupling 11 dissipates the impact energy of the chain 8 through the deformation of the elastic block 12 (attenuation rate >40%), blocks the transmission of high-frequency vibration to the gear 3 and bearing inside the oil pump 1, and reduces mechanical meshing noise.

[0052] Compared with the prior art, the present invention has the following advantages:

[0053] The planetary gearbox oil supply mechanism incorporates a bell-shaped guide (6) at the oil inlet pipe 4. This guide, also called a flow collector, has a smooth inner wall and can be made of engineering plastics or stainless steel. This design addresses fluid noise (cavitation, turbulence noise). It significantly reduces the inlet oil velocity, decreases local resistance, improves the inlet flow pattern, and allows the oil to enter the pump chamber more smoothly. Reducing the flow velocity and minimizing eddies helps increase the effective suction pressure and reduces the likelihood of cavitation and air pockets (cavitation collapse is one of the main sources of high-frequency hissing or popping sounds). This effectively reduces the noise generated during the operation of this mechanism.

[0054] Meanwhile, a small flexible coupling 11 is added between the output shaft of the drive motor 10 and the second sprocket 9. This coupling contains several elastic blocks 12. Chain drives are characterized by a polygonal effect, which generates periodic impact torques and vibrations. The flexible coupling 11 effectively absorbs these high-frequency instantaneous impact energies, significantly reducing the excitation force transmitted to the first sprocket 7 and internal gear 3 of the oil pump 1. This directly reduces the generation of mechanical meshing vibration noise (gear and bearing noise) at its source. Therefore, the noise generated during the operation of this device is greatly reduced.

Claims

1. A planetary gearbox oil supply mechanism, characterized in that, It includes an oil supply pump (1), an end cover (2), a gear (3), an oil inlet pipe (4), and an oil outlet pipe (5). The end cover (2) is fixedly connected to the front of the oil supply pump (1), and two meshing gears (3) are movably connected inside the oil supply pump (1). The oil supply pump (1) is fixedly connected to an oil inlet pipe (4) at its input end and to an oil outlet pipe (5) at its output end. The outer port of the oil inlet pipe (4) is fixedly connected to a flared mouth (6) whose diameter gradually increases from the outside to the inside. The power input end of the oil pump (1) is fixedly connected to a first sprocket (7), and the first sprocket (7) is coaxially linked with a gear (3); A chain (8) is movably connected to the outer surface of the first sprocket (7), and a second sprocket (9) is movably connected to the inner side of the chain (8). The oil pump (1) has a motor (10) on its side. The output end of the motor (10) is connected to the second sprocket (9) through an elastic coupling (11). Several elastic blocks (12) are embedded in the middle section of the elastic coupling (11).

2. The planetary gearbox oil supply mechanism as described in claim 1, characterized in that: The oil supply pump (1) is specifically a gear pump, and a mounting base is fixedly connected to the bottom of the oil supply pump (1).

3. The planetary gearbox oil supply mechanism as described in claim 2, characterized in that: The gears (3) are distributed vertically, and the connection points of the oil inlet pipe (4), the oil outlet pipe (5) and the oil supply pump (1) are all filled with rubber sealing rings.

4. The planetary gearbox oil supply mechanism as described in claim 3, characterized in that: The inner wall of the flared mouth (6) is smooth, and the flared mouth (6) is welded to the oil inlet pipe (4).

5. The planetary gearbox oil supply mechanism as described in claim 4, characterized in that: The flexible coupling (11) is divided into three parts. The two ends of the flexible coupling (11) are rigid, and the central interlayer is elastic.

6. The planetary gearbox oil supply mechanism as described in claim 5, characterized in that: The flexible coupling (11) is connected to the output end of the motor (10) and the corresponding part of the second sprocket (9) by a number of fasteners.

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