A hydraulic torque compensation device

Abstract

This invention discloses a hydraulic torque compensation device, belonging to the field of vibration isolation installation technology for aviation equipment. It includes a left actuator cylinder, a right actuator cylinder, and a hydraulic pipe. Both the left and right actuator cylinders include a cylinder liner and an actuator rod, forming a hydraulic chamber. The hydraulic chambers of the left and right actuator cylinders are connected through the hydraulic pipe. A rubber layer is provided between the cylinder liner and the actuator rod, and the rubber layer is fixedly connected to the cylinder liner and the actuator rod. A pin is provided on the actuator rod, penetrating from its side. The pin has a connecting lug. Pin holes are formed in the side wall of the cylinder liner and the rubber layer. Both ends of the pin extend from the pin holes, and the pin can move with the actuator rod. This invention is applicable to aircraft turboprop engines, with a service life comparable to the engine itself, achieving maintenance-free operation throughout its entire lifespan.

Description

Technical Field

[0001] This invention belongs to the field of vibration isolation installation technology for aviation equipment, and specifically relates to a hydraulic torque compensation device. Background Technology

[0002] Many aircraft models currently use turboprop engines, which are mounted inside the aircraft via engine mounts and vibration isolation systems. During takeoff, cruise, rapid climb, and idling, the turboprop engines transmit enormous thrust and torque to the aircraft, while also transmitting significant clockwise torsional loads to the engine mounts and vibration isolation systems. To protect the engine mounts and vibration isolation systems from excessive deformation and damage due to torsional loads, torque compensation devices must be installed on the engine mounts to limit the reaction torque generated by the engine.

[0003] Existing hydraulic torque compensation devices, see Figure 1 The system includes a left actuator cylinder 5, a right actuator cylinder 6, and a hydraulic pipe 4. Both the left and right actuator cylinders include a cylinder liner 1 and an actuator rod 2. The actuator rod 2 is inserted within the cylinder liner 1 to form a hydraulic chamber 3. Hydraulic oil is contained within the hydraulic chamber 3 and the hydraulic pipe 4. The hydraulic torque compensation device is vertically fixed to the engine mounting bracket. The actuator rod 2 of the left actuator cylinder 5 points downwards and connects to a connecting component on the engine. The actuator rod 2 of the right actuator cylinder 6 points upwards and also connects to a connecting component on the engine. When the aircraft engine is running, a clockwise torque is transmitted to the hydraulic torque compensation device through the connecting component. The left actuator rod experiences an upward force, and the right actuator rod experiences a downward force. The hydraulic chamber 3 is compressed, increasing the pressure on the hydraulic oil within the chamber and generating a reverse force, forming torsional stiffness, thus enabling the torque compensation device to perform an anti-torsional function.

[0004] The hydraulic torque compensation device can only function if there is a good seal between the cylinder sleeve 1 and the actuator rod 2. However, due to the large torsional load of aircraft turboprop engines, the hydraulic torque compensation device needs to withstand a high workload. Hydraulic oil has a very high density and is almost incompressible; compression of about 2 millimeters generates enormous pressure, making it prone to leakage under pressure. This prevents the seal between the cylinder sleeve 1 and the actuator rod 2 from being maintained for an extended period, resulting in a short service life for the hydraulic torque compensation device. Consequently, the hydraulic torque compensation devices on the aircraft engine mounting bracket need to be replaced frequently, increasing not only the aircraft's maintenance costs but also the probability of aircraft malfunctions. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic torque compensation device for installation on aircraft turboprop engines, which has a service life comparable to that of the engine and can achieve maintenance-free operation throughout its entire life cycle.

[0006] The technical solution of the present invention is as follows: A hydraulic torque compensation device includes a left actuator, a right actuator, and a hydraulic pipe. Both the left and right actuators include a cylinder liner and an actuator rod, forming a hydraulic chamber. The hydraulic chambers of the left and right actuators are connected through the hydraulic pipe. The cylinder liner and actuator rod are provided with a rubber layer, which is fixedly connected to the cylinder liner and actuator rod. The actuator rod has a pin extending through its side, and the pin has a connecting lug. The side wall of the cylinder liner and the rubber layer have pin holes, and both ends of the pin extend from the pin holes. The pin can move with the actuator rod within the pin holes.

[0007] In use, the hydraulic torque compensation device of this invention is vertically fixed on the engine mounting bracket. The connecting lug of the left actuator faces downward and is connected to the connecting component on the engine, while the connecting lug of the right actuator faces upward and is also connected to the connecting component on the engine. When the hydraulic torque compensation device receives a clockwise torque transmitted from the engine, the actuator rod of the left actuator receives an upward force, and the actuator rod of the right actuator receives a downward force. The hydraulic chamber is compressed, the pressure on the hydraulic oil increases, generating a reverse force and forming torsional stiffness. Furthermore, the actuator rod displaces, causing the rubber layer to deform and form stiffness. Both types of stiffness work together to resist torsion. This design, while ensuring torsional resistance, reduces the displacement distance of the actuator and the degree of deformation of the rubber layer, thus reducing the risk of hydraulic oil leakage and excessive deformation of the rubber layer. The rubber layer also increases the sealing between the cylinder liner and the actuator rod.

[0008] Furthermore, a gap is designed between the pin, the rubber layer, and the cylinder liner. Under normal operating conditions, the pin will not interfere with the deformation of the rubber layer. However, when the deformation of the rubber layer is too large, the pin can prevent the deformation of the rubber layer from continuing to expand through the metal connection, thus avoiding the actuator from detaching from the cylinder liner and damage from excessive deformation of the rubber. In summary, this significantly increases the service life of the hydraulic torque compensation device.

[0009] Furthermore, the connecting lug includes a lug hole, and the two ends of the pin are thickened and inserted into the lug hole. This connection method is simple and reliable, and other connection methods between the pin and the actuator can also be used.

[0010] Furthermore, the rubber layer is a cylindrical rubber sleeve that matches the actuating rod. A one-piece molded rubber sleeve provides a better connection.

[0011] Furthermore, the rubber sleeve is made of vulcanized rubber. The connection between the actuator rod and the cylinder liner via the rubber layer of vulcanized rubber can significantly improve the sealing performance of the cylinder.

[0012] Furthermore, the pin and the actuator are connected by an interference fit. This connection method is simple and reliable, but other pin and actuator connection methods can also be used.

[0013] Furthermore, the inner surface of the cylinder liner is covered with vulcanized rubber. This optimized design further improves the sealing performance of the actuator.

[0014] Furthermore, the hydraulic hose is a rubber hose with an internal braided steel wire mesh. A rubber hose with an internal braided steel wire mesh is a composite pipe. Its internal structure includes an inner rubber layer and an outer rubber layer, with the braided steel wire mesh positioned between the inner and outer rubber layers to provide reinforcement. By using hydraulic hoses of different strengths, the stiffness of the hydraulic oil within the hose can be adjusted, and non-linear stiffness can also be achieved.

[0015] Furthermore, the cylinder sleeve is equipped with a cylinder base. Adding a base facilitates installation.

[0016] Furthermore, the cylinder base is provided with a pipeline connecting the hydraulic pipe and the hydraulic chamber, which facilitates pipeline design.

[0017] Furthermore, the cylinder base is equipped with pipes for fluid injection and venting, facilitating fluid injection and venting. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the principle of an existing hydraulic torque compensation device; Figure 2 This is a schematic diagram of the external appearance of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the left actuator cylinder of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the right actuator cylinder of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 5 This is a top view schematic diagram of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 6 This is a cross-sectional view (AA) of the left actuator cylinder of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 7 This is a BB cross-sectional view of the right actuator cylinder of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 8 This is a three-dimensional schematic diagram of the installation of the hydraulic torque compensation device according to an embodiment of the present invention; Figure 9 This is a front view of the installation of the hydraulic torque compensation device according to an embodiment of the present invention.

[0019] in, Figure 1 The markings are explained below: 1. Cylinder liner; 2. Actuating rod; 3. Hydraulic chamber; 4. Hydraulic pipe; 5. Left actuator; 6. Right actuator.

[0020] Figure 2-9 The markings are explained below: 1. Cylinder liner; 2. Actuating rod; 3. Hydraulic chamber; 4. Hydraulic pipe; 5. Left actuator; 6. Right actuator; 7. Pin; 8. Pin hole; 9. Rubber layer; 10. Connecting lug; 11. Cylinder base; 12. Engine; 13. Engine mounting bracket. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] See Figure 2-7 This invention discloses a hydraulic torque compensation device, comprising a left actuator cylinder 5, a right actuator cylinder 6, and a hydraulic pipe 4. Both the left and right actuator cylinders include a cylinder sleeve 1 and an actuator rod 2, forming a hydraulic chamber 3. The hydraulic chambers 3 of the left and right actuator cylinders are connected via the hydraulic pipe 4, and both the hydraulic chambers 3 and the hydraulic pipe 4 are filled with hydraulic oil. The cylinder sleeve 1 and the actuator rod 2 are sealed together by a rubber layer 9, which is a cylindrical vulcanized rubber sleeve that matches the actuator rod 2. The actuator rod 2 has a pin 7 extending through its side, and the pin 7 is connected to the actuator rod 2 by an interference fit. Pin holes 8 are formed on the side wall of the cylinder sleeve 1 and the rubber layer 9, and both ends of the pin 7 extend from the pin holes 8. The pin 8 has connecting lugs 10, each including a lug hole, into which the two ends of the pin 7 are thickened and inserted. The cylinder liner 1 is equipped with a cylinder base 11, which has a pipeline connecting the hydraulic pipe 4 and the hydraulic chamber 3. The cylinder base 11 is also equipped with pipelines for fluid injection and venting.

[0023] See Figure 8 and Figure 9 When in use, the hydraulic torque compensation device of the present invention is vertically fixed on the engine mounting bracket 13. The connecting lug 10 of the left actuator 5 is connected to the connecting component on the engine 12, and the connecting lug 10 of the right actuator 6 is also connected to the connecting component on the engine 12.

[0024] During takeoff, cruise, rapid climb, and idling, the clockwise torque generated by the engine is transmitted to the connecting lug 10 through the connecting components on the engine. The connecting lug 10 of the left actuator cylinder 5 experiences an upward force, causing the actuator rod 2 of the left actuator cylinder to move upward. The connecting lug 10 of the right actuator cylinder 6 experiences a downward force, causing the actuator rod 2 of the right actuator cylinder to move downward. The hydraulic chamber 4 is compressed, and the hydraulic oil inside is pressurized, generating a reverse force and forming torsional stiffness. Furthermore, the displacement of the actuator rod 2 causes the rubber layer 9 to deform, forming stiffness. The two types of stiffness work together to resist torsion. Because the rubber layer 9 has a certain stiffness, this stiffness can form a parallel relationship with the rubber vibration isolation device of the engine vibration isolation system, sharing some of the vibration load and providing a certain degree of protection for the rubber vibration isolation device, thus increasing its service life.

[0025] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A hydraulic torque compensation device, comprising a left actuator (5), a right actuator (6), and a hydraulic pipe (4), wherein both the left and right actuators include a cylinder sleeve (1) and an actuator rod (2), the cylinder sleeve (1) and the actuator rod (2) forming a hydraulic chamber (3), and the hydraulic chambers (3) of the left and right actuators are connected through the hydraulic pipe (4), characterized in that, A rubber layer (9) is provided between the cylinder sleeve (1) and the actuator (2). The rubber layer (9) is fixedly connected to the cylinder sleeve (1) and the actuator (2). The actuator (2) is provided with a pin (7) that passes through its side. The pin (7) is provided with a connecting lug (10). The side wall of the cylinder sleeve (1) and the rubber layer (9) are provided with pin holes (8). The two ends of the pin (7) extend out from the pin holes (8). The pin (7) can move with the actuator (2). There is a gap between the pin (7), the rubber layer (9) and the cylinder sleeve (1). Under normal working conditions, the pin (7) will not interfere with the deformation of the rubber layer. However, when the deformation of the rubber layer is too large, the pin can prevent the deformation of the rubber layer from continuing to expand through the metal connection, so as to avoid the actuator (2) from coming off the cylinder sleeve and the rubber from being damaged by excessive deformation. The hydraulic pipe (4) is a rubber hose with a braided steel wire mesh inside the pipe wall.

2. The hydraulic torque compensation device according to claim 1, characterized in that, The connecting lug (10) includes a lug hole, and the two ends of the pin (7) are thickened and inserted into the lug hole.

3. The hydraulic torque compensation device according to claim 1, characterized in that, The rubber layer (9) is a cylindrical rubber sleeve that matches the actuator (2).

4. The hydraulic torque compensation device according to claim 1, characterized in that, The rubber layer (9) is vulcanized rubber.

5. The hydraulic torque compensation device according to claim 1, characterized in that, The pin (7) and the actuating rod (2) are connected by an interference fit.

6. The hydraulic torque compensation device according to claim 1, characterized in that, The inner surface of the cylinder liner (1) is covered with vulcanized rubber.

7. The hydraulic torque compensation device according to claim 1, characterized in that, The cylinder liner (1) is provided with a cylinder base (11).

8. The hydraulic torque compensation device according to claim 7, characterized in that, The cylinder base (11) is provided with a pipeline connecting the hydraulic pipe (4) and the hydraulic chamber (3).

9. The hydraulic torque compensation device according to claim 8, characterized in that, The cylinder base (11) is provided with pipes for liquid injection and venting.

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