Optimization method for key groove of aviation high-strength double-channel oil way cylinder base and cylinder base

Abstract

The invention relates to the technical field of aviation cylinder seats, in particular to an optimization method of a key groove of a high-strength double-channel oil way cylinder seat for aviation and the cylinder seat, and the optimization method comprises the following steps: obtaining target maximum tensile stress meeting the tensile strength requirement; obtaining the target maximum shear stress meeting the shear strength requirement; and obtaining the thickness of the key groove part meeting the use requirement and the minimum wall thickness between the bolt hole and the inner wall of the key groove. The key groove designed through the optimization method has guiding significance for follow-up design of the aviation high-strength double-channel oil way cylinder base meeting the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation cylinder seats, and particularly relates to an optimization method for a keyway of a high-strength dual-channel oil-way aviation cylinder seat and a cylinder seat. Background Art

[0002] Due to the diversity and complexity of daily aviation flight missions, the usage requirements of the main brake wheel are gradually increasing. The main brake wheel is installed on the main landing gear of the aircraft and is used to support the aircraft and bear the loads during takeoff, landing, ground taxiing, and turning of the aircraft. The wheel assembly and the brake device are the key functional components of the main brake wheel. Under the braking pressure provided by the brake system, the cylinder seat assembly generates a hydraulic thrust to press the static and dynamic brake discs of the brake device. The static and dynamic brake discs rub against each other to generate a braking torque, which is transmitted to the brake housing through the static disc and to the wheel assembly through the dynamic disc, braking and stopping the aircraft during takeoff and landing, and converting the kinetic energy of the aircraft into heat through friction; in situations such as aircraft self-check, reverse towing, warm-up on the takeoff line, and parking on a slope, the aircraft is kept stationary relative to the ground.

[0003] In recent years, safety problems caused by braking have occurred frequently. Among them, the cylinder seat assembly is an important component of the brake device, which is used to receive the pressure of the hydraulic oil source of the brake system and convert the hydraulic pressure into a thrust through the piston assembly to press the piston assembly against the brake disc to achieve the braking function. At present, the brake device generally adopts a hydraulic disc brake structure. The cylinder seat receives the pressure supply of the oil source or gas source of the brake system through a hydraulic or pneumatic channel. The hydraulic disc brake device can be divided into a hydraulic single-channel type and a hydraulic dual-channel type according to the different hydraulic oil source systems. The structure of the single-channel cylinder seat is shown in Figure 1 , and the structure of the dual-channel cylinder seat is shown in Figure 2 . The brake devices of conventional military and civilian aircraft all use single-channel cylinder seats. However, with the increase in combat usage requirements, the structure of the hydraulic dual-channel cylinder seat has gradually become the focus of research.

[0004] In the prior art, a dual-channel oil-way cylinder seat has been proposed. The two oil ways are respectively as shown in Figure 2 and Figure 3 . Although this cylinder seat has a dual-channel oil way, in the later design calculation and test verification, under the test conditions of the tangential load (referred to as the peak braking torque) of the maximum rated load of the wheel, the keyway part of the cylinder seat will break. Therefore, whether it is possible to provide an independent dual-channel oil way, and at the same time have the functions of providing thrust and transmitting the braking torque, and whether the strength of the cylinder seat can meet the use safety are important development directions in the design and research of cylinder seats in the field of aviation wheel brakes at the present stage.

[0005] Therefore, an optimization method for a keyway of a high-strength dual-channel oil-way aviation cylinder seat and a cylinder seat are needed to solve the above problems. Summary of the Invention

[0006] The present invention provides an optimization method for a keyway of a high-strength dual-channel oil-way cylinder block for aviation and a cylinder block to solve existing problems.

[0007] The optimization method for the keyway of the high-strength dual-channel oil-way cylinder block for aviation of the present invention adopts the following technical solutions, including: Obtain the maximum tensile stress at the keyway part of the cylinder block where the landing gear force arm is installed, and judge whether the cylinder block keyway meets the tensile strength requirement according to the maximum tensile stress. If not, adjust the thickness in the tensile direction of the keyway part or adjust the contact height between the keyway and the key until the tensile strength requirement is met, and take the maximum tensile stress that meets the tensile strength requirement as the target maximum tensile stress; Obtain the maximum shear stress at the keyway part of the cylinder block where the landing gear force arm is installed, and judge whether the cylinder block keyway meets the shear strength requirement according to the maximum shear stress. If not, adjust the thickness in the shear direction of the keyway or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway until the shear strength requirement is met, and take the maximum shear stress that meets the shear strength requirement as the target maximum shear stress; According to the target maximum tensile stress and the target maximum shear stress, obtain the combined stress of the keyway part, and judge whether the cylinder block keyway meets the service requirement according to the combined stress. If not, adjust the thickness in the shear direction of the keyway, or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway, or the thickness in the tensile direction of the keyway part, or adjust the contact height between the keyway and the key; Until the service requirement is met, take the thickness in the shear direction of the keyway that meets the service requirement, adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway, the thickness in the tensile direction of the keyway part, and the contact height between the keyway and the key as the optimized keyway parameters.

[0008] Preferably, the step of obtaining the maximum tensile stress at the keyway part of the cylinder block where the landing gear force arm is installed is: Obtain the maximum tensile stress at the keyway part of the cylinder block where the landing gear force arm is installed according to the peak braking torque, the number of keys, the number of keyways, the acting radius of the key and the central axis, and the thickness in the tensile direction of the keyway; the contact height between the keyway and the key.

[0009] Preferably, the expression of the maximum tensile stress at the keyway part of the cylinder block where the landing gear force arm is installed is:

[0010] In the formula, represents the maximum tensile stress at the keyway part of the cylinder block where the landing gear force arm is installed; represents the peak braking torque; represents the number of keys; represents the number of keyways; Denotes the uneven coefficient of key operation; Denotes the acting radius of the key with respect to the central axis; Denotes the thickness in the stretching direction of the keyway; Denotes the contact height between the keyway and the key.

[0011] Preferably, the steps for obtaining the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed are as follows: Based on the peak braking torque, the number of keys, the number of keyways, the acting radius of the key with respect to the central axis, the thickness in the shear direction of the keyway, and the minimum wall thickness between the bolt hole and the keyway, obtain the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed.

[0012] Preferably, the expression for the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed is:

[0013] In the formula, Denotes the maximum tensile stress of the keyway part on the cylinder block where the landing gear lever is installed; Denotes the peak braking torque; Denotes the number of keys; Denotes the number of keyways; Denotes the uneven coefficient of key operation; Denotes the acting radius of the key with respect to the central axis; Denotes the thickness in the shear direction of the keyway; Denotes the minimum wall thickness between the bolt hole and the keyway.

[0014] Preferably, the expression for the combined stress of the keyway part is:

[0015] In the formula, Denotes the combined stress of the keyway part; Denotes the target maximum tensile stress; Denotes the target maximum shear stress.

[0016] Preferably, the steps for determining whether the keyway of the cylinder block meets the tensile strength requirement are as follows: If the allowable stress of the cylinder block material is greater than or equal to the maximum tensile stress, then the keyway of the cylinder block meets the tensile strength requirement; If the allowable stress of the cylinder block material is less than the maximum tensile stress, then the keyway of the cylinder block does not meet the tensile strength requirement.

[0017] Preferably, the steps for determining whether the keyway of the cylinder block meets the shear strength requirement are as follows: If the allowable shear stress of the cylinder block material is greater than or equal to the maximum shear stress, the keyway of the cylinder block meets the tensile strength requirement; If the allowable shear stress of the cylinder block material is less than the maximum shear stress, the keyway of the cylinder block does not meet the shear strength requirement.

[0018] Preferably, the steps for determining whether the keyway of the cylinder block meets the service requirements are as follows: If the allowable stress of the cylinder block material is greater than or equal to the combined stress at the keyway, the keyway of the cylinder block meets the service requirements; If the allowable stress of the cylinder block material is less than the combined stress at the keyway, the keyway of the cylinder block does not meet the service requirements.

[0019] An aviation high-strength dual-channel oil-way cylinder block of the present invention adopts the following technical solutions, including: optimizing the keyway of the cylinder block by using an optimization method for the keyway of the aviation high-strength dual-channel oil-way cylinder block of the present invention; designing the cylinder block according to the optimized keyway of the cylinder block.

[0020] The beneficial effects of the present invention are as follows: The present invention proposes an optimization method for the keyway of an aviation high-strength dual-channel oil-way cylinder block, that is, by calculating the tensile strength and shear strength of the keyway of the cylinder block to adjust the keyway parameters of the cylinder block, so that the keyway of the cylinder block meets the tensile strength requirement and the shear strength requirement. Further, based on the target maximum tensile stress and the target maximum shear stress when meeting the tensile strength requirement and the shear strength requirement, the combined stress at the keyway is obtained, and it is determined whether the keyway of the cylinder block meets the service requirements according to the combined stress, and the keyway parameters of the cylinder block when not meeting the requirements are adjusted. Finally, the keyway parameters of the cylinder block that meet the requirements are obtained. Then, the keyway parameters of the cylinder block that meet the requirements can be used to design an aviation high-strength dual-channel oil-way cylinder block that meets the requirements, which has guiding significance for the subsequent design of the cylinder block. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a flowchart of an optimization method for the keyway of an aviation high-strength dual-channel oil-way cylinder block of the present invention; Figure 2 It is a cross-sectional view of the main brake oil way of a dual-channel oil-way cylinder block in the prior art; Figure 3A cross-sectional view of the emergency braking oil circuit of a dual-channel oil circuit cylinder block in the prior art; Figure 4 A schematic diagram of a cylinder block optimized by an optimization method for a keyway of a high-strength dual-channel oil circuit cylinder block for aviation using the present invention; Figure 5 A three-dimensional schematic diagram of a cylinder block optimized by an optimization method for a keyway of a high-strength dual-channel oil circuit cylinder block for aviation using the present invention; Figure 6 For Figure 2 and Figure 3 The stress nephogram of the keyway part of the cylinder block before optimization shown; Figure 7 For Figure 4 The stress nephogram of the keyway part of the optimized cylinder block shown.

[0023] In the figure: 1, piston hole; 2, main braking oil circuit; 3, main braking oil circuit inlet; 4, bolt hole; 5, keyway; 6, indicating rod hole; 7, emergency braking oil circuit; 8, emergency braking oil circuit inlet; 9, rib. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] An embodiment of an optimization method for a keyway of a high-strength dual-channel oil circuit cylinder block for aviation, as Figure 1 shown, includes: S1. Obtain the target maximum tensile stress that meets the tensile strength requirement; Specifically, obtain the maximum tensile stress of the keyway part on the cylinder block where the landing gear force arm is installed. Judge whether the cylinder block keyway meets the tensile strength requirement according to the maximum tensile stress. If not, adjust the tensile direction thickness of the keyway part or adjust the contact height between the keyway and the key (the tensile direction thickness of the keyway part in this embodiment) until the tensile strength requirement is met, and take the maximum tensile stress that meets the tensile strength requirement as the target maximum tensile stress.

[0026] Exemplarily, in this embodiment, the steps for obtaining the maximum tensile stress at the keyway part of the cylinder block where the landing gear lever is installed are as follows: Based on the peak braking torque, the number of keys, the number of keyways, the action radius of the key with respect to the central axis, the thickness in the stretching direction of the keyway; the contact height between the keyway and the key, obtain the maximum tensile stress at the keyway part of the cylinder block where the landing gear lever is installed. That is, the expression for the maximum tensile stress at the keyway part of the cylinder block where the landing gear lever is installed is:

[0027] In the formula, represents the maximum tensile stress at the keyway part of the cylinder block where the landing gear lever is installed; represents the peak braking torque; represents the number of keys; represents the number of keyways; represents the uneven coefficient of key operation; represents the action radius of the key with respect to the central axis; represents the thickness in the stretching direction of the keyway; represents the contact height between the keyway and the key.

[0028] Exemplarily, the steps for determining whether the keyway of the cylinder block meets the tensile strength requirement are as follows: If the allowable stress of the cylinder block material is greater than or equal to the maximum tensile stress, then the keyway of the cylinder block meets the tensile strength requirement; if the allowable stress of the cylinder block material is less than the maximum tensile stress, then the keyway of the cylinder block does not meet the tensile strength requirement. That is, record the allowable stress of the cylinder block material as , if ≥ , the strength of the keyway part of the cylinder block meets the tensile strength requirement; if < , then the strength of the keyway part of the cylinder block does not meet the tensile strength requirement. Take the maximum tensile stress that meets the tensile strength requirement as the target maximum tensile stress .

[0029] S2. Obtain the target maximum shear stress that meets the shear strength requirement; Specifically, obtain the maximum shear stress at the keyway part of the cylinder block where the landing gear lever is installed. Determine whether the keyway of the cylinder block meets the shear strength requirement according to the maximum shear stress. If not, adjust the thickness in the shear direction of the keyway, or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway (in this embodiment, adjust the thickness in the shear direction of the keyway) until the shear strength requirement is met. Take the maximum shear stress that meets the shear strength requirement as the target maximum shear stress.

[0030] Exemplarily, the steps to obtain the maximum shear stress of the keyway part for mounting the landing gear lever on the cylinder block are as follows: Based on the peak braking torque, the number of keys, the number of keyways, the acting radius of the key with respect to the central axis, the thickness in the shear direction of the keyway; the minimum wall thickness between the bolt hole and the keyway, obtain the maximum shear stress of the keyway part for mounting the landing gear lever on the cylinder block. That is, the expression for the maximum shear stress of the keyway part for mounting the landing gear lever on the cylinder block is:

[0031] In the formula, represents the maximum tensile stress of the keyway part for mounting the landing gear lever on the cylinder block; represents the peak braking torque; represents the number of keys; represents the number of keyways; represents the uneven coefficient of key operation; represents the acting radius of the key with respect to the central axis; represents the thickness in the shear direction of the keyway; represents the minimum wall thickness between the bolt hole and the keyway.

[0032] Among them, the steps to determine whether the keyway of the cylinder block meets the shear strength requirement are as follows: If the allowable shear stress of the cylinder block material is greater than or equal to the maximum shear stress, then the keyway of the cylinder block meets the tensile strength requirement; if the allowable shear stress of the cylinder block material is less than the maximum shear stress, then the keyway of the cylinder block does not meet the shear strength requirement. That is, in this embodiment, the allowable shear stress of the cylinder block material , if ≥ , then the strength of the keyway part of the cylinder block meets the shear strength requirement; if < , then the strength of the keyway part of the cylinder block does not meet the shear strength requirement, and take the maximum shear stress that meets the shear strength requirement as the target maximum shear stress .

[0033] S3. Obtain the keyway parameters that meet the usage requirements; Specifically, according to the target maximum tensile stress and the target maximum shear stress, obtain the combined stress of the keyway part, and determine whether the keyway of the cylinder block meets the usage requirements based on the combined stress. If not, then adjust the thickness in the shear direction of the keyway, or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway, or the thickness in the tensile direction of the keyway part, or adjust the contact height between the keyway and the key (the thickness in the shear direction of the keyway in this embodiment); until the usage requirements are met, and take the thickness in the shear direction of the keyway that meets the usage requirements, the adjusted minimum wall thickness between the bolt hole and the inner wall of the keyway, the thickness in the tensile direction of the keyway part, and the contact height between the keyway and the key as the optimized keyway parameters.

[0034] Exemplarily, the expression for the combined stress at the keyway part is:

[0035] In the formula, represents the combined stress at the keyway part; represents the target maximum tensile stress; represents the target maximum shear stress.

[0036] Exemplarily, the steps for determining whether the cylinder block keyway meets the usage requirements are as follows: If the allowable stress of the cylinder block material is greater than or equal to the combined stress at the keyway part, then the cylinder block keyway meets the usage requirements; if the allowable stress of the cylinder block material is less than the combined stress at the keyway part, then the cylinder block keyway does not meet the usage requirements, that is, if ≥ , the keyway part of the cylinder block meets the usage requirements; if < , then the cylinder block keyway does not meet the usage requirements.

[0037] It should be noted that the allowable stress of the cylinder block material and the allowable shear stress of the cylinder block material in this embodiment are both obtained from the aviation material handbook.

[0038] An embodiment of a high-strength dual-channel oil-way cylinder block for aviation according to the present invention, as shown in Figure 2 and Figure 3 , includes: a cylinder block base body, a main brake oil way 2 and a standby brake oil way 7. Six piston holes 1 are evenly distributed around the center of the cylinder block base body; both the main brake oil way 2 and the standby brake oil way 7 are arranged inside the cylinder block base body, and there is a certain distance between the main brake oil way 2 and the standby brake oil way 7 in the axial direction of the cylinder block base body. Among them, the main brake oil way 2 communicates with two adjacent piston holes 1, and the standby brake oil way 7 communicates with the piston holes 1 not connected by the main brake oil way 2; and both the main brake oil way 2 and the standby brake oil way 7 are used to communicate with the hydraulic oil tank of the braking system. Among them, a keyway 5 for installing the landing gear force arm is provided on the cylinder block base body. The keyway 5 cooperates with the landing gear force arm to connect the cylinder block to the landing gear and transmit the braking disc friction torque. The keyway 5 adopts an optimization method for a high-strength dual-channel oil-way cylinder block keyway of the present invention to design and optimize the keyway 5 shown in Figure 2 and Figure 3 . The cylinder block after optimizing the keyway 5 is as shown in Figure 4 and Figure 5 .

[0039] Exemplarily, as shown in Figure 2 and Figure 3As shown, the main brake oil circuit 2 includes two first sub-oil circuits, and each first sub-oil circuit is connected to two piston holes 1 spaced apart. Among them, the two first sub-oil circuits connected to the same piston hole 1 form a connected oil circuit within the piston hole 1. For example, Figure 1 As shown, the main brake oil circuit 2 is connected to three spaced piston holes 1. The ports of the first sub-oil circuits are all sealed by plugs, and a main brake oil circuit inlet 3 is provided on the piston hole 1 where the inlet of the main brake oil circuit is located, and a first oil outlet is provided on the piston hole 1 where the outlet of the main brake oil circuit is located. Among them, an indicating rod hole 6 for assembling the indicating rod on the brake disc is also provided on one side of the cylinder block base. When the indicating rod is flush with the indicating rod hole 6, it can be confirmed that the brake disc has been used up to its service life.

[0040] Exemplarily, for example, Figure 4 As shown, the standby brake oil circuit includes two second sub-oil circuits. Each second sub-oil circuit is connected to two piston holes 1 spaced apart, and the second sub-oil circuit is not connected to the piston holes 1 passed by the first sub-oil circuit. Among them, the two second sub-oil circuits connected to the same piston hole 1 form a connected oil circuit within the piston hole 1. The ports of the second sub-oil circuits are all sealed by plugs, and a standby brake oil circuit inlet 8 is provided on the piston hole 1 where the inlet of the standby brake oil circuit is located, and a second oil outlet is provided on the piston hole 1 where the outlet of the standby brake oil circuit is located.

[0041] Exemplarily, in this embodiment, the second sub-oil circuit and the first sub-oil circuit are arranged within the rib 9 between every two adjacent piston holes 1, and the rib 9 is used to withstand hydraulic pulses and structural forces.

[0042] Exemplarily, the middle part of the cylinder block base is an installation hole, and a plurality of bolt holes 4 are provided on the cylinder block base between the installation hole and the piston hole 1. The bolt holes 4 are used to install high-strength bolts for connecting the cylinder block base and the brake housing.

[0043] Exemplarily, the cylinder block base is made of 7050 high-strength aluminum alloy.

[0044] In order to verify the reliability of the optimization method of the present invention, the following will describe this method in combination with specific simulation data: In this simulation case, M is 28750 N·m, is 1, is 1, k is 0.75, is 22 mm, is 65 mm, is 97.5 mm, the maximum tensile stress is 206.2 MPa, and the allowable stress of the cylinder block material is 410 MPa, meeting the requirements, that is, the target maximum tensile stress is 206.2 MPa.

[0045] When M is 28750 N·m, is 1, is 1, k is 0.75, is 22 mm, is 65 mm, is 97.5 mm, is 15.5 mm, is 65 mm, the maximum shear stress is 584.45 MPa, and the allowable shear stress of the cylinder block material is 410 MPa. The keyway part of the cylinder block does not meet the shear strength requirement. At this time, the thickness of the keyway part of the cylinder block in the shear direction is increased , in this embodiment, the thickness is increased by 1 mm each time, and the maximum shear stress of the keyway part of the adjusted cylinder block is calculated according to step 2 until the adjusted maximum shear stress is less than or equal to the allowable shear stress of the cylinder block material, then the maximum shear stress at this time is used as the target maximum shear stress , in this embodiment, is 393 MPa.

[0046] To ensure the consistency of the bolt holes, the thickness of the keyway part of the cylinder block in the shear direction that is increased is increased to 23 mm, and the calculated adjusted maximum shear stress is 393 MPa, which is less than the allowable shear stress of the cylinder block material , meeting the shear strength requirement.

[0047] In this implementation, when is 393 MPa and is 206.2 MPa, the combined stress of the keyway part is 395.745 MPa, which is less than the allowable stress (460 MPa) when the cylinder block material is selected as 7050 aluminum alloy. After analysis, using the optimization method of the cylinder block keyway structure of the present invention for cylinder block design can reduce the shear stress of the cylinder block by about 32%. Combining with the simulation analysis results, it proves the effectiveness of the method and has guiding significance for the design of the double-channel oil cylinder block for aircraft wheels.

[0048] To further verify whether the structural strength of the cylinder block in this implementation meets the requirements, the unoptimized cylinder block shown in Figure 2 and Figure 3 is selected and compared with the optimized cylinder block shown in Figure 4 in terms of stress simulation. Based on the previous experimental verification, the keyway 5 part of the cylinder block is the structural dangerous area. Under the tangential load (structural moment) test condition of the maximum rated load of the wheel, the strength of the cylinder block is insufficient, and the keyway area of the cylinder block will break, as shown in Figure 6As shown, the maximum principal stress of the cylinder block before optimization is 447.48 MPa, and the maximum principal stress is concentrated in the area of the mounting keyway 5 of the cylinder block, which has exceeded the tensile limit (410 MPa) of the 2A14 aluminum alloy material; as Figure 7 shown, the combined stress of the keyway part of the optimized cylinder block is 395.745 MPa, which is less than the allowable stress (460 MPa) when the cylinder block material is selected as 7050 aluminum alloy, and also less than the yield strength of 410 MPa of the 7050 aluminum alloy material. Therefore, the cylinder block designed based on the present invention can meet the use safety of the double-channel oil circuit cylinder block.

[0049] Specific working principle During use, when the aircraft brakes, the control system controls the high-pressure brake oil to enter the piston hole through the main brake oil circuit 2. The piston installed in the piston hole moves forward under the action of the brake pressure, pressing the static brake disc assembly against the dynamic brake disc assembly, thereby generating a frictional torque to stop the rotating wheel. The landing gear lever is installed in the keyway 5 of the cylinder block, thereby transmitting this frictional torque to the landing axle; when the main brake oil circuit 2 fails, the brake system controls the brake oil circuit to switch to the standby brake oil circuit 7, and the high-pressure brake oil of the system enters the piston hole through the main brake oil circuit. The piston installed in the piston hole moves forward under the action of the brake pressure, pressing the static brake disc assembly against the dynamic brake disc assembly, thereby generating a frictional torque to stop the rotating wheel.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optimization method for the keyway of a high-strength dual-channel oil circuit cylinder block for aviation, characterized in that, Including: Obtain the maximum tensile stress of the keyway part on the cylinder block where the landing gear lever is installed. Determine whether the keyway of the cylinder block meets the tensile strength requirement based on the maximum tensile stress. If not, adjust the thickness in the tensile direction of the keyway part or adjust the contact height between the keyway and the key until the tensile strength requirement is met. Take the maximum tensile stress that meets the tensile strength requirement as the target maximum tensile stress. Obtain the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed. Determine whether the keyway of the cylinder block meets the shear strength requirement based on the maximum shear stress. If not, adjust the thickness in the shear direction of the keyway or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway until the shear strength requirement is met. Take the maximum shear stress that meets the shear strength requirement as the target maximum shear stress. Based on the target maximum tensile stress and the target maximum shear stress, obtain the combined stress of the keyway part. Determine whether the keyway of the cylinder block meets the service requirement based on the combined stress. If not, adjust the thickness in the shear direction of the keyway, or adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway, or the thickness in the tensile direction of the keyway part, or adjust the contact height between the keyway and the key. Until the service requirement is met, take the thickness in the shear direction of the keyway that meets the service requirement, adjust the minimum wall thickness between the bolt hole and the inner wall of the keyway, the thickness in the tensile direction of the keyway part, and the contact height between the keyway and the key as the optimized keyway parameters.

2. The optimization method of a high-strength dual-channel oil-way cylinder block keyway for aviation according to claim 1, characterized in that The steps to obtain the maximum tensile stress of the keyway part on the cylinder block where the landing gear lever is installed are as follows: Based on the peak braking torque, the number of keys, the number of keyways, the acting radius of the key from the central axis, the thickness in the tensile direction of the keyway; the contact height between the keyway and the key, obtain the maximum tensile stress of the keyway part on the cylinder block where the landing gear lever is installed.

3. The optimization method of a high-strength dual-channel oil-way cylinder block keyway for aviation according to claim 1, characterized in that, The expression for the maximum tensile stress of the keyway part on the cylinder block where the landing gear lever is installed is: In the formula, represents the maximum tensile stress at the keyway part where the landing gear force arm is installed on the cylinder block; represents the peak braking torque; represents the number of keys; represents the number of keyways; represents the uneven coefficient of key operation; represents the acting radius of the key and the central axis; represents the thickness in the stretching direction of the keyway; represents the contact height between the keyway and the key.

4. The optimization method of a high-strength dual-channel oil-way cylinder block keyway for aviation according to claim 1, characterized in that, The steps to obtain the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed are as follows: Based on the peak braking torque, the number of keys, the number of keyways, the acting radius of the key from the central axis, the thickness in the shear direction of the keyway; the minimum wall thickness between the bolt hole and the keyway, obtain the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed.

5. An optimization method for a high-strength dual-channel oil circuit cylinder block keyway for aviation, characterized in that, The expression for the maximum shear stress of the keyway part on the cylinder block where the landing gear lever is installed is: Wherein, represents the maximum tensile stress at the keyway portion for mounting the landing gear force arm on the cylinder block; represents the peak braking torque; represents the number of keys; represents the number of keyways; represents the uneven coefficient of key operation; represents the action radius of the key with respect to the central axis; represents the thickness in the shear direction of the keyway; represents the minimum wall thickness between the bolt hole and the keyway.

6. The optimization method of a high-strength dual-channel oilway cylinder block keyway for aviation according to claim 1, characterized in that The expression for the combined stress of the keyway part is: In the formula, represents the comprehensive stress of the keyway part; represents the target maximum tensile stress; represents the target maximum shear stress.

7. An optimization method for a high-strength dual-channel oil passage cylinder block keyway for aviation according to claim 1, characterized in that The steps to determine whether the keyway of the cylinder block meets the tensile strength requirement are as follows: If the allowable stress of the cylinder block material is greater than or equal to the maximum tensile stress, the keyway of the cylinder block meets the tensile strength requirement. If the allowable stress of the cylinder block material is less than the maximum tensile stress, the keyway of the cylinder block does not meet the tensile strength requirement.

8. An optimization method for a high-strength dual-channel oil passage cylinder block keyway for aviation according to claim 1, characterized in that, The steps to determine whether the keyway of the cylinder block meets the shear strength requirement are as follows: If the allowable shear stress of the cylinder block material is greater than or equal to the maximum shear stress, the keyway of the cylinder block meets the tensile strength requirement. If the allowable shear stress of the cylinder block material is less than the maximum shear stress, the keyway of the cylinder block does not meet the shear strength requirement.

9. The optimization method of a high-strength dual-channel oil-way cylinder block keyway for aviation according to claim 1, characterized in that The steps to determine whether the keyway of the cylinder block meets the service requirement are as follows: If the allowable stress of the cylinder block material is greater than or equal to the combined stress of the keyway part, the keyway of the cylinder block meets the service requirement. If the allowable stress of the cylinder block material is less than the combined stress at the keyway part, the keyway of the cylinder block does not meet the usage requirements.

10. A high-strength dual-channel oil-way cylinder block for aviation, characterized in that Including: Optimizing the keyway of the cylinder block by using the optimization method of a high-strength dual-channel oil-way cylinder block keyway for aviation according to any one of claims 1-9; Designing the cylinder block according to the optimized keyway of the cylinder block.

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