CN214776662U - Rocker arm type undercarriage small-stroke reloading-free false airplane wheel - Google Patents
Rocker arm type undercarriage small-stroke reloading-free false airplane wheel Download PDFInfo
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- CN214776662U CN214776662U CN202120930569.3U CN202120930569U CN214776662U CN 214776662 U CN214776662 U CN 214776662U CN 202120930569 U CN202120930569 U CN 202120930569U CN 214776662 U CN214776662 U CN 214776662U
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Abstract
The utility model belongs to the technical field of the undercarriage test, a rocking arm formula undercarriage small stroke exempts from false wheel of reloading is related to, it includes main part (1), be provided with shaft hole (11) and side direction loading structure (12) of installation undercarriage wheel axle on main part (1), be provided with two at least loading hole (13) on side direction loading structure (12), loading hole (13) are selected according to buffer and tire compression volume under the different operating modes and are connected forcing mechanism, the hole axis of every loading hole (13) has different extending direction, and the hole axis of every loading hole (13) has different heights in the radial Y direction of false wheel, be provided with load loading area in loading hole (13), load loading area's center is located the position of false wheel ground point under the simulation operating mode. The application can avoid the structural interference generated by loading lugs with different side loads under the working condition of small stroke, thereby effectively improving the loading precision of the test and shortening the test period.
Description
Technical Field
The application belongs to the technical field of undercarriage tests, and particularly relates to a rocker arm type undercarriage small-stroke reloading-free false airplane wheel.
Background
In the case of a rocker arm type landing gear, the change of the compression amount of a buffer and a tire not only changes the position of a high stress point (the bearing angle of a rocker arm changes), but also causes the nonlinear change of moment and concentrated force on a main intersection point, and in order to improve the test precision and the test efficiency, a plurality of side load loading points need to be added on a false wheel structure.
The buffer and the tire compression change to generate multiple working conditions, in order to simulate different working conditions, a plurality of loading lugs are adopted in the current test process, the mounting angle and the mounting position of each loading lug are different, when the loading lugs are connected with a force application mechanism, the loading lugs are used for simulating the loading of lateral loads under different working conditions, namely the positions of loading points provided by different loading lugs are different, but when the buffer and the tire compression change slightly, the mounting positions of the loading lugs calculated according to theory can be overlapped, and structural interference can be generated inevitably when structural processing is carried out.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the rocker arm type undercarriage small-stroke reloading-free false wheel structure can effectively avoid structural interference of loading points and improve test efficiency.
The application provides a rocker arm formula undercarriage small stroke exempts from to change outfit false wheel, including the main part, be provided with the shaft hole of installation undercarriage wheel axle on the main part, wherein, the main part still includes the side direction loading structure, the structural two at least loading holes that are provided with of side direction loading, the loading hole is according to bumper and the alternative coupling forcing mechanism of tire compression volume under the different operating modes, every the hole axis of loading hole has different extending direction, and every the hole axis of loading hole is in different heights have in the radial Y direction of false wheel, be provided with load loading region in the loading hole, load loading region's center is located the position of false wheel ground point under the simulated condition.
Preferably, the extending direction of the hole axis of each loading hole is configured to: and under the simulation working condition corresponding to the loading hole, the hole axis of the loading hole is parallel to the horizontal plane corresponding to the simulation working condition.
Preferably, the extending direction of the hole axis of each loading hole is calculated in the following manner: and setting a reference working condition and a reference axis corresponding to the reference working condition, wherein the reference axis is vertical to the Y direction, when a corresponding loading hole is adopted to be connected with the force application mechanism, the working condition corresponding to the loading hole is relative to the wheel rotation angle calculated under the reference working condition, and the wheel rotation angle is taken as the rotation angle of the hole axis of the loading hole relative to the reference axis, which rotates around the Y axis by taking the wheel center as the rotation center.
Preferably, the side-loading structure is a single-lug structure.
Preferably, the side-loading structure is removably attached to the body portion.
Preferably, the side-loading structure is integrally designed with the body portion.
Preferably, the side loading structure is provided in plurality.
Preferably, the force applying mechanism comprises a ram.
Preferably, the body portion is also provided with a forward load application point.
Preferably, the loading hole is internally provided with an annular bulge, and the part surrounded by the annular bulge is used as a load loading area.
The application designs a more advanced false wheel structure of rocker arm formula undercarriage, can avoid the structure interference that different side direction load loading auricles produced under little stroke operating mode to effectively improve experimental loading precision, shorten experimental period.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a rocker arm type landing gear small-stroke reloading-free dummy wheel of the application.
Fig. 2 is a schematic diagram of the design principle.
FIG. 3 is a schematic side-loading configuration of FIG. 1 of the present application.
Fig. 4 is a schematic view of section a-a of fig. 3.
Fig. 5 is a schematic view of section B-B of fig. 3.
Fig. 6 is a schematic view of a loading hole design of the wheel structure of the reloading-free dummy of the application.
Wherein 1-main body portion, 11-shaft hole, 12-side loading structure, 13-loading hole, 14-forward loading point.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
The rocker arm type landing gear small-stroke replacement-free dummy wheel comprises a main body portion 1, wherein a shaft hole 11 for installing a landing gear wheel shaft is formed in the main body portion 1, a lateral loading structure 12 is further included in the main body portion 1, at least two loading holes 13 are formed in the lateral loading structure 12, the loading holes 13 are connected with a force application mechanism according to buffers and tire compression amount alternatives under different working conditions, each loading hole 13 is provided with different extending directions of hole axes, each loading hole 13 is provided with hole axes with different heights in the radial Y direction of the dummy wheel, a load loading area is formed in each loading hole 13, and the center of the load loading area is located at the position of a grounding point of the dummy wheel under a simulation working condition.
Referring to fig. 1, the main body portion 1 is a plate-shaped structure, and forms an XY plane, the Y axis is along the height direction, the upper end of the main body portion 11 is provided with a shaft hole 11, the dummy wheel rotates around the shaft hole 11, the axial direction of the shaft hole 11 is the Z direction, the lower end of the main body portion 11 is a ground end, and the ground end applies a forward load and a side load, and the invention of the present application lies in the design of a side loading structure 12 for the side load.
The design principle of the present application will be described first, as shown in fig. 2, for a rocker arm landing gear, the initial angle between the rocker arm and the strut is θ0Initial length of buffer is S0The initial radius of the tire is R, and when the buffer is compressed by Δ S, the compression amount of the tire isΔRAt this time, the wheel grounding point is changed from a to a'. At the moment, the wheel rotates by the angle
The relationship with Δ S is:
therefore, when the dummy wheel is designed, in order to simulate the working condition, two loading points at different positions need to be arranged on the dummy wheel to respectively simulate a grounding point A and a point A', and forces in different directions need to be applied to the two loading points arranged on the dummy wheel, wherein the directions need to be consistent with the stress directions of the grounding point of the rocker arm type undercarriage caused by the compression of the buffer and the tire, namely, the lateral loads of the load loading points subjected to the ground reaction need to be simulated all the time, and the lateral loads are parallel to the ground.
Returning to fig. 1, in this embodiment, two loading holes 13 are disposed on the lateral loading structure 12, which can implement connection of two force application mechanisms under different working conditions, in an alternative embodiment, 3 or more loading holes may also be designed, and in combination with fig. 3, the two loading holes 13 are staggered in the Y direction, that is, the heights are different, in combination with fig. 4 and 5, the two loading holes 13 are staggered in the X direction, so as to implement different positions of loading points provided by different loading lugs described in the background art.
Referring to fig. 4 and 5, the cross-shaped area of the dotted line is a load loading ear hole area, the cross point is a loading area center point, the center position of each loading hole is a ground point position with different compression amounts, the center position of the force loading is ensured to be at the ground point position, and different loading holes are staggered in the X, Y direction, so that structural interference generated by the loading ear holes can be avoided. When the compression amount of the buffer is changed, the loading device does not need to be replaced, and only the loading equipment needs to be reconnected with a new lateral loading point.
In some alternative embodiments, the direction of extension of the hole axis of each loading hole 13 is configured to: under the simulation working condition corresponding to the loading hole 13, the hole axis of the loading hole 13 is parallel to the horizontal plane corresponding to the simulation working condition. Referring to fig. 3, when the hole axis of the right loading hole extends in the X direction, the left loading hole must be at an angle to the X direction.
The loading hole on the right side is used for simulating a first working condition, the simulation grounding point of the dummy wheel is a point A under the first working condition, the hole axis of the loading hole on the right side is parallel to the horizontal plane corresponding to the first working condition at the point A, the first working condition is changed into a second working condition after the buffer and the tire are compressed, the simulation grounding point of the dummy wheel is a point A 'under the second working condition, and the hole axis of the loading hole on the left side is parallel to the horizontal plane corresponding to the second working condition at the point A'.
In some alternative embodiments, the direction of extension of the bore axis of each loading bore 13 is calculated as follows: and setting a reference working condition and a reference axis corresponding to the reference working condition, wherein the reference axis is vertical to the Y direction, when a corresponding loading hole is adopted to be connected with the force application mechanism, the working condition corresponding to the loading hole is relative to the wheel rotation angle calculated under the reference working condition, and the wheel rotation angle is taken as the rotation angle of the hole axis of the loading hole relative to the reference axis, which rotates around the Y axis by taking the wheel center as the rotation center.
In the following embodiment, assuming that the reference operating condition is operating condition 1, the corresponding wheel rotation angle is 0, corresponding to the right loading hole in fig. 3, and accordingly, the definition of the left loading hole needs to be calculated.
The initial parameters of the landing gear are shown in table 1.
TABLE 1 undercarriage initial parameters
The calculated wheel rotation angle Δ ψ and the wheel center to ground point distance are shown in table 2 according to the formula described in the description of the principle.
TABLE 2 test conditions and compression
The loading device was designed according to the position parameters given in table 2, as shown in fig. 6.
The problem of structural interference generated by a lateral load loading point of the rocker arm type landing gear under a small-stroke working condition is solved for the first time. The method can avoid replacement in static strength tests and fatigue strength tests, improve the working efficiency and effectively shorten the test period.
In some alternative embodiments, the side-loading structure 12 is a single-lug structure. The corresponding force application mechanism provides a double-lug plate structure for clamping the single lug and is connected through a pin shaft.
In some alternative embodiments, the side loading structure 12 is detachably connected to the main body portion 1, and it should be noted that, for the purpose of the present application, it is to provide loading of two or more working conditions by one side loading structure 12, but one side loading structure has a limited number of loading holes due to space limitation, so in order to achieve loading of more working conditions, the side loading structure 12 is generally provided with a plurality of side loading structures, and the side loading structures are detachably fixed on the main body portion 1 to avoid interference to some extent, and it should be noted that, by the detachable structure, the same side loading structure can be installed at different positions to achieve loading of other working conditions, only the detachable connection point is required to be provided at the corresponding position on the main body portion 1, but at the same time, the dismounting connection points at different positions are different, because if the lateral loading structure is translated to other positions, the loading holes provided on the lateral loading structure are not necessarily suitable for other working conditions, so that the dismounting connection points can be designed to change the central point position of the loading hole and the axial direction of the loading hole of the same lateral loading structure arranged on different dismounting connection points.
The detachable structure of this embodiment includes but is not limited to bolting, clamping.
In some alternative embodiments, the side-loading structure 12 is designed integrally with the body portion 1.
In some alternative embodiments, the force applying mechanism comprises a ram.
In some alternative embodiments, as shown in fig. 1, the main body portion 1 is further provided with a forward load loading point 14 to simulate a loading condition of the tire in a heading direction when the tire rolls on the ground.
In some alternative embodiments, the loading hole 13 has an annular protrusion therein, and the portion surrounded by the annular protrusion serves as a load loading area. Referring to fig. 5 and 6, the crisscross area is a load loading area defined by the annular protrusion, that is, the loading hole 13 has a plurality of portions with different inner diameters, the loading tab is connected by the portion with the smaller inner diameter, and the portion with the larger inner diameter is not in contact with the force applying mechanism, so that the position of the different loading holes in the X direction can be changed.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A rocker arm type undercarriage small-stroke reloading-free false wheel comprises a main body part (1), the main body part (1) is provided with a shaft hole (11) for mounting a landing gear wheel shaft, characterized in that the body part (1) further comprises a side loading structure (12), the lateral loading structure (12) is provided with at least two loading holes (13), the loading holes (13) are selected to be connected with a force application mechanism according to the compression amount of the buffer and the tire under different working conditions, the hole axis of each loading hole (13) has different extension directions, and the bore axis of each loading bore (13) has a different height in the radial Y direction of the dummy wheel, and a load loading area is arranged in the loading hole (13), and the center of the load loading area is positioned at the grounding point of the dummy wheel under the simulated working condition.
2. The rocker-arm landing gear small-stroke reloading-free dummy wheel according to claim 1, wherein the direction of extension of the bore axis of each loading bore (13) is configured to: and under the simulation working condition corresponding to the loading hole (13), the hole axis of the loading hole (13) is parallel to the horizontal plane corresponding to the simulation working condition.
3. A rocker arm landing gear small stroke reloading free dummy wheel according to claim 2, wherein the direction of extension of the bore axis of each loading bore (13) is calculated as follows: and setting a reference working condition and a reference axis corresponding to the reference working condition, wherein the reference axis is vertical to the Y direction, when a corresponding loading hole is adopted to be connected with the force application mechanism, the working condition corresponding to the loading hole is relative to the wheel rotation angle calculated under the reference working condition, and the wheel rotation angle is taken as the rotation angle of the hole axis of the loading hole relative to the reference axis, which rotates around the Y axis by taking the wheel center as the rotation center.
4. A rocker arm landing gear small stroke reloading free false wheel as claimed in claim 1, wherein said side loading structure (12) is of a single lug configuration.
5. A rocker arm landing gear small stroke reloading free dummy wheel according to claim 1, wherein said lateral loading structure (12) is removably connected to said main body portion (1).
6. A rocker arm landing gear small stroke reloading free dummy wheel according to claim 1, characterized in that said lateral loading structure (12) is designed in one piece with said main body portion (1).
7. A rocker arm landing gear small stroke reloading free dummy wheel according to claim 1, wherein said side loading structure (12) is provided in plurality.
8. The rocker arm landing gear small stroke reloading free dummy wheel of claim 1, wherein said forcing mechanism comprises a ram.
9. A rocker arm landing gear small stroke reloading free dummy wheel according to claim 1, wherein said main body portion (1) is further provided with a forward load loading point (14).
10. The rocker arm landing gear small-stroke reloading-free dummy wheel as claimed in claim 1, wherein an annular protrusion is arranged in the loading hole (13), and a part surrounded by the annular protrusion is used as a load loading area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120930569.3U CN214776662U (en) | 2021-04-30 | 2021-04-30 | Rocker arm type undercarriage small-stroke reloading-free false airplane wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120930569.3U CN214776662U (en) | 2021-04-30 | 2021-04-30 | Rocker arm type undercarriage small-stroke reloading-free false airplane wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214776662U true CN214776662U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120930569.3U Active CN214776662U (en) | 2021-04-30 | 2021-04-30 | Rocker arm type undercarriage small-stroke reloading-free false airplane wheel |
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| Country | Link |
|---|---|
| CN (1) | CN214776662U (en) |
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2021
- 2021-04-30 CN CN202120930569.3U patent/CN214776662U/en active Active
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