An adjustable pressure step up pressure valve and lubrication system

Abstract

The utility model discloses a kind of adjustable pressure stepped pressure increasing valve and lubricating system, the pressure increasing valve includes valve body, and one end of valve body is equipped with oil inlet;Radial along valve body is equipped with with the lubricating oil total mouth and clutch pressure oil port that communicate with delivery oil channel, and the other end of valve body is equipped with the pressure increasing piston that can move along axial direction, and it is equipped with pressure increasing spring in the valve body outside pressure increasing piston;First stepped pressure oil port is equipped on the valve body between lubricating oil total mouth and clutch pressure oil port;First stepped pressure oil port and lubricating oil total mouth are equipped with communication oil channel;Annular groove is equipped with in the inner wall of delivery oil channel corresponding to lubricating oil total mouth, to constitute second stepped pressure oil port;Adjusting mechanism is adjusted in communication oil channel, adjusting mechanism is detachably set in connection channel, and adjusting mechanism is replaced to adjust the opening pressure of second stepped pressure oil port, facilitating.The pressure setting value of the pressure increasing valve in the utility model can be adjusted, can adapt to multiple working conditions, realize one valve multiuse and reduce power loss.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, and relates to pressure boosting valves, particularly to an adjustable pressure stepped pressure boosting valve and a lubrication system. Background Technology

[0002] Pressure boosting valves are key components in hydraulic and lubrication systems, widely used in gearbox systems in fields such as construction machinery, wind power generation, and ship propulsion. Their core function is to increase or regulate the initial pressure provided by the oil pump according to system operating conditions, ensuring stable and sufficient lubricating oil pressure and flow for critical friction pairs such as clutches, bearings, and gears. This guarantees smooth equipment startup, reliable operation, and extended service life.

[0003] Currently, most common booster valves employ a spring-piston structure. Their basic working principle is as follows: the inlet pressure acts on one end of the piston, balancing the spring force at the other end. When the inlet pressure overcomes the spring preload, the piston moves, opening or closing the corresponding oil passage, thereby controlling the output pressure.

[0004] However, existing booster valves have fixed pressure settings, resulting in poor adaptability. They can only be optimized for a specific operating condition. When the gearbox model changes, or the same gearbox needs to operate under different loads and speeds, the fixed pressure settings cannot meet the changing requirements. If the pressure is too high, it will lead to increased power loss in the lubrication system and low energy efficiency; if the pressure is too low, it will cause poor lubrication and accelerate equipment wear. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, the purpose of this invention is to provide an adjustable pressure stepped booster valve and lubrication system. The pressure setting value of the booster valve described in this invention is adjustable, adaptable to various working conditions, enabling multiple uses of a single valve and reducing power loss.

[0006] The technical solution of this utility model is implemented as follows:

[0007] An adjustable pressure stepped booster valve includes a valve body. One end of the valve body has an oil inlet, and the valve body has a delivery oil passage communicating with the oil inlet. The delivery oil passage is arranged along the axial center of the valve body. A lubricating oil main port and a clutch pressure oil port communicating with the delivery oil passage are arranged radially along the valve body. The clutch pressure oil port is located between the oil inlet and the lubricating oil main port. At the other end of the valve body, a booster piston that can move axially is provided. A booster spring that applies an elastic force to the booster piston is provided in the valve body outside the booster piston. At the same time, a sealing cover is provided outside the booster spring to close the other end of the valve body.

[0008] A first-step pressure port is provided on the valve body between the main lubricating oil port and the clutch pressure port. The first-step pressure port is arranged radially along the valve body and communicates with the delivery oil passage. A connecting oil passage is provided between the first-step pressure port and the main lubricating oil port, and a sealing element is provided on the outside of the first-step pressure port so that all the oil entering the first-step pressure port enters the main lubricating oil port. An annular groove is provided on the inner wall of the delivery oil passage corresponding to the main lubricating oil port to form a second-step pressure port. An adjustment mechanism is provided in the connecting oil passage. The adjustment mechanism is detachably installed in the connecting channel to facilitate the replacement of the adjustment mechanism to adjust the opening pressure of the second-step pressure port.

[0009] Furthermore, an adjusting shim is provided between the pressure spring and the sealing cover to adjust the clamping force of the pressure spring.

[0010] Furthermore, the adjustment mechanism is an adjustment screw, which has a throttling hole and a thread on the connecting oil passage, so that the adjustment screw can be detachably fixed on the connecting oil passage, thereby allowing the adjustment screws of different hole diameters to be replaced to adjust the opening pressure of the second-stage pressure oil port.

[0011] This utility model also provides a lubrication system, which includes the aforementioned adjustable pressure stepped booster valve, as well as a pressure oil pump, an oil sump, and a drive unit.

[0012] The oil tank is connected to the oil inlet via an oil inlet pipeline, the pressure oil pump is installed on the oil inlet pipeline, and the drive unit is connected to the pressure oil pump.

[0013] Furthermore, the drive unit is a diesel engine or an electric motor.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model, through the coordinated operation of the first-stage pressure port, the second-stage pressure port, and the booster piston, enables the booster valve to automatically switch its operating mode according to the oil flow rate. Under low-speed, low-flow conditions of the drive unit, only the first-stage pressure port is opened to provide a stable basic lubrication pressure; under high-speed, high-flow conditions, both the first and second-stage pressure ports are opened to provide higher step pressure; thus adapting to different operating conditions.

[0016] 2. This utility model allows for efficient adjustment of the first-stage pressure setting by increasing or decreasing the thickness of the pressure regulating shim; and precise adjustment of the second-stage pressure setting by replacing the adjusting screw with a different orifice diameter throttling screw. This enables a single pressure boosting valve to be adapted to different models and specifications of gearboxes or various operating conditions through simple adjustments, achieving multi-purpose functionality and reducing power loss. Attached Figure Description

[0017] Figure 1 -A schematic diagram of the pressure boosting valve described in this utility model.

[0018] Figure 2 - A schematic diagram of the adjusting screw.

[0019] Figure 3 - A schematic diagram of the lubrication system.

[0020] Figure 4 - A schematic diagram of the structure when the first-stage pressure oil port is open.

[0021] Figure 5 - A schematic diagram of the structure when both the first-stage pressure oil port and the second-stage pressure oil port are open.

[0022] Figure 6 - A schematic diagram of the boost curve.

[0023] Wherein: 1-valve body; 2-pressure booster spring; 3-sealing cover; 4-pressure adjusting shim; 5-pressure booster piston; 6-adjustable screw; 7-solenoid valve; 8-pressure oil pump; 9-oil sump; 10-drive host; A-oil inlet; B-first-stage pressure oil port; C-second-stage pressure oil port; D-clutch pressure oil port; F-lubricating oil main port. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Most commonly used booster valves employ a spring-piston structure. Their basic working principle is as follows: the inlet pressure acts on one end of the piston, balancing the spring force at the other end. When the inlet pressure overcomes the spring preload, the piston moves, opening or closing the corresponding oil passage, thereby controlling the output pressure.

[0026] However, existing booster valves have fixed pressure settings, resulting in poor adaptability. They can only be optimized for a specific operating condition. When the gearbox model changes, or the same gearbox needs to operate under different loads and speeds, the fixed pressure settings cannot meet the changing requirements. If the pressure is too high, it will lead to increased power loss in the lubrication system and low energy efficiency; if the pressure is too low, it will cause poor lubrication and accelerate equipment wear.

[0027] Based on this, the present invention provides an adjustable pressure stepped booster valve, including a valve body 1. One end of the valve body 1 is provided with an oil inlet A. The valve body 1 is provided with a conveying oil passage communicating with the oil inlet A. The conveying oil passage is arranged along the axial center of the valve body 1. A lubricating oil main port F and a clutch pressure oil port D communicating with the conveying oil passage are provided radially along the valve body 1. The clutch pressure oil port D is located between the oil inlet A and the lubricating oil main port F. At the other end of the valve body 1, a booster piston 5 that can move axially is provided. A booster spring 2 is provided in the valve body 1 outside the booster piston 5 to apply an elastic force to the booster piston 5. At the same time, a sealing cover 3 is provided outside the booster spring 2 to close the other end of the valve body 1.

[0028] A first stepped pressure port B is provided on the valve body 1 between the main lubricating oil port F and the clutch pressure port D. The first stepped pressure port B is arranged radially along the valve body 1 and communicates with the delivery oil passage. A connecting oil passage is provided between the first stepped pressure port B and the main lubricating oil port F, and a screw is provided on the outside of the first stepped pressure port B so that all the oil entering the first stepped pressure port B enters the main lubricating oil port F. An annular groove is provided on the inner wall of the delivery oil passage corresponding to the main lubricating oil port F to form a second stepped pressure port C. An adjustment mechanism is provided in the connecting oil passage. The adjustment mechanism is detachably installed in the connecting channel to facilitate the replacement of the adjustment mechanism to adjust the opening pressure of the second stepped pressure port C.

[0029] Here, a first-stage pressure port and a second-stage pressure port are provided. At low flow rates, only the first-stage pressure port B (first-stage pressure) is opened. At high flow rates, both the first-stage pressure port B and the second-stage pressure port C (second-stage pressure) are opened simultaneously. This allows the booster valve to automatically adapt to different operating conditions of the drive unit from startup to high-speed operation, providing two matching lubrication pressures ("low" and "high") for equipment such as gearboxes, avoiding the incompatibility of a single pressure mode under varying operating conditions. When machining the first-stage pressure port B, it is designed as a process hole connecting the oil delivery channel to the outside. A screw is installed on the outside of the process hole to seal it, ensuring that all oil entering the first-stage pressure port B flows through the connecting oil channel into the main lubrication port F.

[0030] Meanwhile, the second-stage pressure port here is annular and corresponds to the main lubricating oil port F, which is equivalent to forming an annular oil drain channel on the oil delivery channel. When the booster piston moves to the position where the second-stage pressure port C is opened, this annular channel can provide a large flow area, ensuring that the oil can be quickly depressurized at high flow rates, thereby stably establishing the second-stage pressure, while with small pressure fluctuations and fast response.

[0031] An adjustment mechanism is installed in the connecting oil passage between the first-stage pressure port and the main lubricating oil port, allowing for precise adjustment of the opening pressure of the second-stage pressure port. In practical applications, the magnitude of the second-stage pressure can be customized according to the high-speed lubrication requirements of different gearboxes or different working loads, greatly enhancing the versatility and adaptability of the booster valve.

[0032] In specific implementation, a pressure adjusting shim 4 is provided between the pressure boosting spring 2 and the sealing cover 3 to adjust the clamping force of the pressure boosting spring 2.

[0033] In use, the initial compression (i.e., clamping force) of the booster spring can be directly changed by increasing or decreasing the thickness of the pressure adjusting shims, thus efficiently adjusting the opening pressure of the first-stage pressure port B. This eliminates the need to replace the booster spring or booster valve; adjustment can be achieved simply by using shims of different thicknesses, effectively reducing debugging and maintenance costs.

[0034] For specific implementation, please refer to Figure 2 The adjustment mechanism is an adjustment screw 6, which has a throttling hole and a thread on the connecting oil passage, so that the adjustment screw 6 can be detachably fixed on the connecting oil passage. This allows for the replacement of adjustment screws 6 with different hole diameters to adjust the opening pressure of the second-stage pressure port C.

[0035] Here, the throttling orifice in the adjusting screw acts as a fixed hydraulic resistance. By changing the adjusting screw with different orifice diameters Ф, the flow resistance of the lubricating oil flowing from the first-stage pressure port B to the main lubricating oil port F can be altered. The greater the resistance, the higher the oil pressure required for the second-stage pressure; the smaller the resistance, the lower the oil pressure required for the second-stage pressure. In this way, the second-stage pressure value can be effectively adjusted.

[0036] Meanwhile, the adjusting screw is fixed to the valve body via a threaded connection, making it easy to replace. In practical applications, operators can quickly adjust the system's pressure characteristics as if replacing a screw, without disassembling the entire valve body, greatly improving the maintainability and debugging efficiency of the equipment.

[0037] A lubrication system includes the aforementioned adjustable pressure step-type booster valve, and further includes a pressure oil pump, an oil sump, and a drive unit. The booster valve has a matching solenoid valve 7.

[0038] The oil sump 9 is connected to the oil inlet A via an oil inlet pipe. The pressure oil pump 8 is installed on the oil inlet pipe, and the drive unit 10 is connected to the pressure oil pump 8. When the drive unit 10 is working, the pressure oil pump 8 draws oil from the oil sump 9 into the oil inlet A. The drive unit 10 is either a diesel engine or an electric motor.

[0039] In the initial state, the booster piston 5 is pressed against the inner wall of the oil delivery passage of the valve body by the pressure of the booster spring 2. The first step pressure oil port B and the second step pressure oil port C are both closed, and the lubricating oil cannot pass through.

[0040] When the drive unit 10 starts initially, the speed is still low, and the oil pump 8 draws in a small amount of oil. Pressurized oil enters inlet A, and the pressure on the booster piston 5 pushes it to the left. At this time, the booster spring 2 is compressed, and the spring's rightward reaction force and the piston's leftward pressure reach equilibrium. At this point, the first-stage pressure oil port B opens, and oil flows through the adjustable screw 6 into the main lubricating oil port F. Because the oil volume is low at this time, the second-stage pressure oil port C remains closed. (See details...) Figure 4 .

[0041] As the speed of the drive unit 10 continues to increase, the oil suction of the pressure pump 8 increases, and more pressure oil enters the inlet A. At this time, the first-stage pressure port B, due to its small diameter, is insufficient to discharge all the pressure oil from the first-stage pressure port B into the lubricating oil main port F. The pressure oil continues to push the booster piston 5 to the left, and the booster spring 2 continues to be compressed. The greater spring reaction force and piston pressure reach equilibrium, at which point both the first-stage pressure port B and the second-stage pressure port C open, and the pressure oil enters the lubricating oil main port F. See details... Figure 5 .

[0042] The pressure setting value of the booster valve described in this utility model is adjustable, allowing for adjustment of both the first-stage and second-stage pressures under different operating conditions. Adjustment of the first-stage pressure can be achieved by increasing or decreasing the thickness of the adjusting shim; adjustment of the second-stage pressure can be achieved by increasing or decreasing the size of the adjustable screw orifice. A schematic diagram of the booster valve's pressure curve is shown below. Figure 6 As shown.

[0043] Finally, it should be noted that the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations and modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. An adjustable pressure stepped booster valve, comprising a valve body, an oil inlet at one end of the valve body, a delivery oil passage communicating with the oil inlet within the valve body, the delivery oil passage being arranged along the axial center of the valve body; a lubricating oil main port and a clutch pressure oil port communicating with the delivery oil passage are arranged radially along the valve body, the clutch pressure oil port being located between the oil inlet and the lubricating oil main port; a booster piston movable axially is provided at the other end of the valve body, and a booster spring is provided within the valve body outside the booster piston to apply an elastic force to the booster piston, while a sealing cap is provided outside the booster spring to seal the other end of the valve body; characterized in that: A first-step pressure port is provided on the valve body between the main lubricating oil port and the clutch pressure port. The first-step pressure port is arranged radially along the valve body and communicates with the delivery oil passage. A connecting oil passage is provided between the first-step pressure port and the main lubricating oil port, and a sealing element is provided on the outside of the first-step pressure port so that all the oil entering the first-step pressure port enters the main lubricating oil port. An annular groove is provided on the inner wall of the delivery oil passage corresponding to the main lubricating oil port to form a second-step pressure port. An adjustment mechanism is provided in the connecting oil passage. The adjustment mechanism is detachably installed in the connecting channel to facilitate the replacement of the adjustment mechanism to adjust the opening pressure of the second-step pressure port.

2. The adjustable pressure stepped booster valve according to claim 1, characterized in that, An adjusting shim is provided between the pressure spring and the sealing cover to adjust the clamping force of the pressure spring.

3. An adjustable pressure stepped booster valve according to claim 1 or 2, characterized in that, The adjustment mechanism is an adjustment screw, which has a throttling hole and a thread on the connecting oil passage, so that the adjustment screw can be detachably fixed on the connecting oil passage. This allows for the replacement of adjustment screws with different hole diameters to adjust the opening pressure of the second-stage pressure port.

4. A lubrication system, characterized in that, The adjustable pressure step-type booster valve according to any one of claims 1-3 further includes a pressure oil pump, an oil sump, and a drive unit; The oil tank is connected to the oil inlet via an oil inlet pipeline, the pressure oil pump is installed on the oil inlet pipeline, and the drive unit is connected to the pressure oil pump.

5. A lubrication system according to claim 4, characterized in that, The drive unit is a diesel engine or an electric motor.

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