Tire loading test equipment and test method

Abstract

The invention discloses tire loading test equipment and a test method. The tire loading test equipment comprises: a loading device comprising a first actuator configured to apply a vertical load to a tire along a vertical loading direction; a tire mounting rack configured to be able to mount a tire to be subjected to a load test; the roll mechanism is arranged below the loading device and is provided with a second actuator, and the second actuator is attached to the tire mounting frame and is configured to enable the tire mounting frame to roll and deflect relative to the horizontal position; the transverse moving mechanism comprises a third actuator and a sliding part which is driven by the third actuator to move in the transverse direction, and the sliding part is arranged to enable the tire mounting frame to transversely move relative to the loading device. According to the tire loading test equipment, the part, in contact with the ground, of the tire can be recalibrated to be vertically aligned with the load acting force by means of the transverse moving mechanism, and the accuracy of the vertical load stress point of the tire is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of tire load condition testing, and in particular to equipment used for tire load condition testing and related testing methods. Background Art

[0002] Aircraft ground handling characteristics are directly related to the function, performance, safety and reliability of the aircraft during ground handling, and are important parameter indicators for aircraft development. These handling characteristics are an important part of aircraft performance requirements and provide important input for the development of related downstream systems (such as tires, landing gear and brakes). Various types of tire test benches are important equipment for obtaining aircraft ground characteristic parameters. In response to the needs of different tire characteristics, there are currently a variety of tire test benches, such as tire drop test benches, inertia turntables and ground dynamics test benches.

[0003] The tire loading equipment in the tire test bench is used to apply load to the tire so that the aircraft tire load characteristics can be tested and verified on the tire test platform. Specifically, the tire loading device needs to apply vertical load, side deviation and roll angle to the aircraft tire to simulate and test the mechanical characteristics of the aircraft tire under real road conditions. Due to the complex tire test conditions, the tire loading mechanism needs to have high-precision loading adjustment capabilities, strong structural force bearing capacity, and precise tire loading center positioning and other stringent conditions.

[0004] When some existing tire loading devices are used, when a vertical load is applied to the tire, the direction of the applied vertical load is vertically aligned with the part where the tire contacts the ground. However, when the tire is turned with a roll angle applied, the tire rolls, causing the part where the tire contacts the ground to change. If a vertical load is applied at this position, the load direction deviates from the part where the tire contacts the ground, and the vertical load actually borne by the tire will have an error from the preset value, thereby affecting the magnitude of the relevant torque. The occurrence of such deviation will negatively affect the accuracy of the test, especially in a mobile tire test bench. Such deviation problems will directly affect the accuracy of the tire's six-component force test results.

[0005] Therefore, it is desirable to provide a tire loading device that can solve the problem of partial deviation between the load direction and the tire's contact with the ground, and improve the accuracy of simulating and testing the mechanical properties of aircraft tires under real road conditions. Summary of the invention

[0006] To overcome the differences in the prior art, the present invention provides a tire loading test device, comprising: a loading device, the loading device comprising a first actuator, the first actuator being configured to apply a vertical load toward the tire along a vertical loading direction; a tire mounting frame, the tire mounting frame being configured to be able to mount a tire for a load test; a roll mechanism, the roll mechanism being arranged below the loading device and having a second actuator, the second actuator being attached to the tire mounting frame and being configured to be able to cause the tire mounting frame to tilt and deflect in a relative horizontal position; and a lateral movement mechanism, the lateral movement mechanism comprising a third actuator and a sliding portion driven by the third actuator to shift in a lateral direction, wherein the sliding portion is arranged to cause the tire mounting frame to move laterally relative to the loading device.

[0007] According to one aspect of the present invention, the roll mechanism is arranged above the tire mounting frame, and the sliding portion of the lateral movement mechanism is arranged between the vertical loading device and the roll mechanism.

[0008] According to another aspect of the present invention, the loading device further comprises a first support member located below the first actuator and attached to the first actuator; the tilt mechanism comprises a second support member located above the second actuator and attached thereto, the third actuator and the sliding portion are arranged between the first support member and the second support member, and the direction of the lateral movement provided by the lateral movement mechanism is parallel to the axis of the rotation shaft of the tire mounted on the tire mounting frame.

[0009] According to still another aspect of the present invention, the first supporting member and the second supporting member are flat plates arranged in parallel.

[0010] According to still another aspect of the present invention, the third actuator comprises a hydraulic actuating cylinder, and the sliding portion comprises a U-shaped guide rail.

[0011] According to another aspect of the present invention, the second actuator of the roll mechanism for generating the roll action comprises four retractable shaft portions, one end of each shaft portion is hingedly mounted on the second support member, and the other end of each shaft portion is hingedly mounted on the top frame of the tire mounting frame.

[0012] According to another aspect of the present invention, the retractable rotating shaft portion includes a housing, a worm gear mechanism and a motor driving the worm gear mechanism, the worm gear mechanisms of the two rotating shaft portions located on one side are driven by one motor, and the worm gear mechanisms of the two rotating shaft portions located on the other side are driven by another motor.

[0013] According to another aspect of the present invention, the worm gear mechanism is a self-locking worm gear mechanism, wherein the lifting and lowering hinge points of the worm wheel and the worm in the worm gear mechanism have a friction force large enough so that after roll adjustment, no rotation occurs between the worm wheel and the worm without the drive of the motor.

[0014] According to yet another aspect of the present invention, the tire to be tested is an aircraft tire.

[0015] In addition, the present invention also provides a test method for performing a tire test using the above-mentioned tire loading test equipment. After the tilting mechanism moves the tire mounting frame with the tire installed, the lateral movement mechanism is actuated to move the tire mounting frame laterally relative to the loading device, so that the force of the loading device is vertically aligned with the contact portion of the tire with the ground.

[0016] In the above test method, the amount of lateral movement is determined based on the size of the tire and the roll angle.

[0017] By using the tire loading test equipment according to the present invention, the functions of vertical load loading, roll load loading and lateral displacement centering return of the ground contact part of the tire are integrated into one. With the help of the lateral displacement mechanism, the part of the tire in contact with the ground can be recalibrated to be vertically aligned with the load force, thereby ensuring the accuracy of the vertical load force point of the tire and improving the accuracy of the test.

[0018] In addition, the rotating shaft portion of the roll mechanism in the tire loading test equipment of the present invention has an automatic locking function, thereby simplifying the process of the test operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings,

[0020] In the figure:

[0021] Figure 1 A three-dimensional schematic diagram of a tire loading test device according to a preferred embodiment of the present invention is shown.

[0022] Figure 2 A three-dimensional schematic diagram showing another angle of a tire loading test device according to a preferred embodiment of the present invention.

[0023] Figure 3 A perspective view showing a traverse mechanism in a tire loading test apparatus according to a preferred embodiment of the present invention.

[0024] Figure 4A The figure is a schematic diagram showing the state of a tire mounting frame with a test tire mounted thereon when the roll mechanism is not tilted and deflected.

[0025] Figure 4BThe schematic diagram shows the state of the tire mounting frame with the test tire mounted thereon after the roll deflection and before the lateral movement of the lateral movement mechanism.

[0026] Figure 4C The figure is a schematic diagram showing a state of a tire mounting frame with a test tire mounted thereon after the roll mechanism is tilted and deflected and the traverse mechanism is traversely operated.

[0027] Reference numerals list

[0028] 1Tire loading test equipment

[0029] 10 Loading device

[0030] 11First actuator

[0031] 12 first support member

[0032] 20Tilt mechanism

[0033] 21 Second actuator

[0034] 210 shaft

[0035] 22 second support member

[0036] 30 Transverse movement mechanism

[0037] 31 Third actuator

[0038] 32 Sliding part

[0039] 50 Tire Mounting Rack

[0040] 51 Top Shelf

[0041] 52 Rotating mounting parts

[0042] 60 Tires

[0043] A Loading axis

[0044] B Rotation axis DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0046] In the following description, "up", "down", "top" and "bottom" refer to the reference orientation of the conventional arrangement position of the equipment 1 when the tire loading test equipment 1 performs a load condition test on the tire 60; "vertical" generally refers to the direction perpendicular to the ground in contact with the tire 60; and "lateral" generally refers to the direction parallel to the ground in contact with the tire 60.

[0047] Figure 1 and Figure 2 Two stereoscopic views of a tire loading test device 1 according to a preferred embodiment of the present invention are shown respectively at different angles. The tire loading test device 1 according to the preferred embodiment comprises a loading device 10, a lateral movement mechanism 30, a roll mechanism 20 and a tire mounting frame 50 from top to bottom, and a test tire 60 has been mounted on the tire mounting frame 50. The entire tire loading test device 1 can be installed in a tire test bench (not shown) to perform various load tests.

[0048] like Figure 1 and Figure 2 As shown, the loading device 10 is configured to apply a vertical load to the tire 60 in the direction of the loading axis A. The roll mechanism 20 is arranged below the loading device 10 and is configured to enable the tire mounting frame 50 to be rotated from the tire mounting frame 50 to the tire mounting frame 50. Figure 4A The untilted position shown is as follows Figure 4B In other words, the roll mechanism 20 is used to deflect the tire mounting frame 50 at a roll angle set according to the test requirements. Accordingly, the test tire 60 mounted on the rotating mounting member 52 of the tire mounting frame 50 is deflected. Here, "roll deflection" means that the rotation axis B of the tire 60 is deflected away from the horizontal position, such as Figure 4B In addition, the traverse mechanism 30 is arranged between the loading device 10 and the roll locking mechanism, and is arranged to cause the force applied by the loading device 10 (usually along the loading axis A) to be laterally offset relative to the roll mechanism 20 and the tire mounting frame 50 .

[0049] like Figure 1 and Figure 2 As shown, the loading device 10 includes a first actuator 11 for generating a vertical force and a first support member 12 attached to the first actuator 11. Preferably, the first actuator 11 is a hydraulic cylinder, which includes a cylinder body containing a liquid and a piston assembly acted upon by the liquid pressure, the piston assembly having a piston rod extending out of the cylinder body, the first support member 12 being attached to one end of the piston rod, and the pressure generated by the hydraulic cylinder is transmitted to the first support member 12 through the piston rod. In a preferred embodiment, the first support member 12 is a flat plate, which is arranged substantially horizontally.

[0050] The roll mechanism 20 below the loading device 10 includes a second actuator 21 for generating a roll motion, and a second support 22 above and attached to the second actuator 21. In a preferred embodiment, the second support 22 is a flat plate, and is arranged substantially horizontally. The first support 12 and the second support 22 are arranged in parallel, and preferably, the area of ​​the flat plate of the first support 12 may be less than or equal to the area of ​​the flat plate of the second support 22.

[0051] The tire mounting frame 50 at the bottom of the tire loading test equipment 1 includes a top frame 51 and a rotating mounting member 52 extending from the bottom of the top frame 51. The top frame 51 is preferably a flat plate, and the upper surface of the flat plate is used to mount the roll mechanism 20. The rotating mounting member 52 can mount various types of tires 60 through a connecting member such as a rotating shaft. In an alternative embodiment, the rotating mounting member 52 is also configured to be detachably mounted to the top frame 51, so that the transport mounting member 52 can adapt to different types of tires 60 in a wider range.

[0052] In a preferred embodiment, the second actuator 21 of the roll mechanism 20 includes four retractable shaft portions 210. One end of each shaft portion 210 is hinged to the second support member 22, specifically to the lower surface of the flat second support member 22, and the other end of each shaft portion 210 is hinged to the top frame 51 of the tire mounting frame 50. These shaft portions 210 are arranged obliquely around the loading axis A of the loading device 10, with the upper end of the shaft portion 210 closer to the loading axis A and the lower end slightly away from the loading axis A. Preferably, when the roll mechanism 20 is in a horizontal position, the inclination angles of these shaft portions 210 relative to the vertical direction are substantially equal.

[0053] In a preferred embodiment, each retractable shaft portion 210 includes a housing and a worm gear mechanism located inside the housing, and the two shaft portions 210 on the same side of the tire 60 are driven by a driving servo motor. The worm gear mechanism can adjust the distance between the lifting and lowering hinge points of the mechanism under the action of the servo motor, and the shaft portions 210 on the opposite sides move in opposite directions, thereby adjusting the tilt angle of the top frame 51 of the tire mounting frame 50. Figure 1 and Figure 2As shown, the worm gear mechanism in each rotating shaft portion 210 is in a contracted state, and the longitudinal axis of each rotating shaft portion 210 is substantially equidistant around the loading axis A, and the angle relative to the vertical direction is substantially equal. At the same time, the top frame 51 of the tire mounting frame 50 is substantially parallel to the second support member 22, and the tire rotation axis B of the tire 60 is in a horizontal position. When the tire 60 needs to be tilted, the first pair of rotating shaft portions 210 on the same side of the tire 60 is extended by a distance under the action of the servo motor, usually by an equal distance, and the second pair of rotating shaft portions 210 on the other side is shortened by a distance under the action of another servo motor. At this time, the top frame 51 of the tire mounting frame 50 is deflected relative to the horizontal plane accordingly, so that the tire 60 is tilted, that is, the rotation axis B is tilted relative to the horizontal plane, and the two side surfaces of the tire 60 are tilted relative to the vertical direction. Preferably, the axis around which the top frame 51 is tilted relative to the horizontal plane is located in the position of the two pairs of rotating shaft portions 210, and preferably the axis is located in the middle plane of the vertically placed tire.

[0054] In a preferred embodiment, the worm gear mechanism used in the rotating shaft portion 210 is a self-locking worm gear mechanism, that is, the lifting and lowering hinge points of the worm wheel and the worm have a large friction force. After the roll adjustment is completed, the worm wheel and the worm will not rotate without the driving force of the motor, thereby achieving the self-locking of the rotating shaft portion 210. Specifically, during the transmission process of the worm gear mechanism, the direction of the force applied to the worm wheel will generate a component force along the axis of the worm wheel, and the direction of the component force is perpendicular to the tooth surface of the worm wheel. The direction of this component force will cause a friction force to be generated between the worm wheel and the worm, and the direction of this friction force is opposite to the rotation direction of the worm wheel. Therefore, in the absence of external force, the worm wheel and the worm will not rotate, thereby achieving the self-locking of the worm gear mechanism.

[0055] Figure 3 The traverse mechanism 30 in the tire loading test equipment 1 is shown. The traverse mechanism 30 is used to achieve alignment between the force of the loading device 10 and the portion of the test tire 60 mounted on the tire mounting frame 50 that contacts the ground.

[0056] Specifically, the lateral movement mechanism 30 includes a third actuator 31 and a sliding part 32. The sliding part 32 is arranged between the first support 12 and the second support 22. The third actuator 31 is used to generate a driving force for the sliding part 32 to move. The sliding part 32 is configured to make the first support 12 and the second support 22 move laterally relative to each other. In a preferred embodiment, the third actuator 31 is, for example, a hydraulic cylinder, and the sliding part 32 may include a U-shaped guide rail. The hydraulic cylinder can drive the U-shaped guide rail to move laterally, so that the second support 22 below moves, thereby driving the roll mechanism 20, the tire mounting frame 50 and the test tire 60 below to work together, so as to achieve the alignment of the loading axis A with the contact position of the tire 60 with the ground during the test. In a preferred embodiment, the direction in which the U-shaped guide rail is set (the direction in which the guide rail extends) should be consistent with the direction of the rotation axis B of the test tire 60.

[0057] FIG. 4A to FIG. 4C FIG. 2 shows the position change of the tire 60 during the operation of the traverse mechanism 30, and the arrow in the figure shows the direction of the force applied by the loading device 10. Figure 4A As shown, the rotation axis of the tire 60 is basically horizontal. At this time, the four retractable shaft parts 210 of the roll mechanism 20 are all in the retracted position, the roll mechanism 20 does not perform the roll action, the tread of the tire 60 is basically parallel to the ground and in contact with the ground, and the position where the force of the loading device 10 is applied is aligned with the part of the tire 60 that is in contact with the ground. In other words, the loading axis A of the loading device 10 is located within the range where the tread contacts the ground, and is preferably in a centered position.

[0058] Next, the two second actuating parts on one side of the vertical axis B of the tire 60 of the roll mechanism 20 extend to tilt the rotation axis of the tire 60, and the tread of the tire 60 tilts accordingly. Figure 4B As shown, the position where the force of the loading device 10 is applied is offset relative to the portion of the tire 60 that contacts the ground.

[0059] In order to eliminate the misalignment, after the roll step is completed, the lateral movement mechanism 30 starts to move, driving the tire mounting frame 50 to move laterally relative to the loading device 10, and the direction of the lateral movement is parallel to the direction of the tire rotation axis B in a horizontal state, so that the position where the force of the loading device 10 is applied is aligned with the part of the tire 60 that contacts the ground, after which the roll load test of the tire 60 can be carried out.

[0060] In some preferred embodiments, the lateral displacement of the lateral displacement mechanism 30 can be determined according to the size and roll angle of the tire 60. For example, the size and roll angle of the tire 60 can be input into the controller of the tire 60 loading test device 1 in advance, and then the lateral displacement required for lateral displacement is calculated or obtained from pre-stored data, and then the third actuator 31 is controlled to actuate the lateral displacement mechanism 30, and the tire mounting frame 50 below is moved, so that the position where the force of the loading device 10 is applied is aligned with the part of the tire 60 in contact with the ground.

[0061] In some other embodiments, the position of the force is pre-set according to the position of the loading device 10, and a sensor capable of detecting the lateral deviation between the part of the tire 60 in contact with the ground and the preset position is provided in the tire loading test equipment 1. The lateral movement mechanism 30 is driven to move laterally according to the lateral deviation measured by the sensor until the sensor detects that the lateral deviation is 0, thereby stopping the lateral movement mechanism 30.

[0062] By using the tire loading test equipment 1 according to the present invention, the functions of vertical load loading, roll load loading, and ground contact center lateral displacement centering return are integrated into one. With the help of the lateral displacement mechanism 30, the part of the tire in contact with the ground can be recalibrated to be vertically aligned with the load force, thereby ensuring the accuracy of the tire vertical load force point and improving the accuracy of the test.

[0063] Furthermore, the rotating shaft portion 210 of the roll mechanism 20 in the tire loading test apparatus 1 of the present invention has an automatic locking function, thereby simplifying the process of the test operation.

[0064] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A tire loading test device, comprising: a loading device, the loading device comprising a first actuator, the first actuator being configured to apply a vertical load toward the tire along a vertical loading direction; a tire mounting frame configured to mount a tire to be subjected to a load test; a roll mechanism disposed below the loading device and having a second actuator attached to the tire mounting frame and configured to enable the tire mounting frame to roll relative to a horizontal position; as well as The traverse mechanism comprises a third actuator and a sliding portion driven by the third actuator to shift in a lateral direction, wherein the sliding portion is arranged to move the tire mounting frame laterally relative to the loading device.

2. The tire loading test equipment according to claim 1, characterized in that: The roll mechanism is arranged above the tire mounting frame, and the sliding portion of the lateral movement mechanism is arranged between the vertical loading device and the roll mechanism.

3. The tire loading test equipment according to claim 1, characterized in that: The loading device also includes a first support member located below the first actuator and attached to the first actuator; The roll mechanism includes a second support member located above and attached to the second actuator, The third actuator and the sliding portion are disposed between the first support and the second support, and the direction of the lateral movement provided by the lateral movement mechanism is parallel to the axis of the rotation shaft of the tire mounted on the tire mounting frame.

4. The tire loading test equipment according to claim 3, characterized in that: The first support member and the second support member are flat plates arranged in parallel. The third actuator includes a hydraulic actuating cylinder, and the sliding portion includes a U-shaped guide rail.

5. The tire loading test equipment according to claim 3, characterized in that: The second actuator of the roll mechanism for generating the roll action comprises four retractable shaft parts, one end of each shaft part is hingedly mounted on the second support member, and the other end of each shaft part is hingedly mounted on the top frame of the tire mounting frame.

6. The tire loading test equipment according to claim 5, characterized in that: The retractable shaft portion includes a housing, a worm gear mechanism and a motor driving the worm gear mechanism. The worm gear mechanisms of the two shaft portions on one side are driven by the same motor, and the worm gear mechanisms of the two shaft portions on the other side are driven by another motor.

7. The tire loading test equipment according to claim 6, characterized in that: The worm gear mechanism is a self-locking worm gear mechanism, wherein the lifting and lowering hinge points of the worm wheel and the worm in the worm gear mechanism have a friction force large enough so that after roll adjustment, no rotation occurs between the worm wheel and the worm without the motor drive.

8. The tire loading test equipment according to claim 1, characterized in that: The tire is a tire of an aircraft.

9. A test method for performing a tire test using the tire loading test equipment according to any one of claims 1 to 8, characterized in that: After the tilting mechanism moves the tire mounting frame with the tire mounted thereon, the lateral movement mechanism is actuated to move the tire mounting frame laterally relative to the loading device, so that the force of the loading device is vertically aligned with the contact portion of the tire with the ground.

10. The method according to claim 9, characterized in that The amount of lateral movement is determined by the size of the tire and the angle of roll.

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