Eccentric distance adjusting device

Abstract

The utility model provides an eccentric distance adjusting device, and relates to the technical field of aircraft dynamic stability derivative wind tunnel tests, the eccentric distance adjusting device comprises a rocker arm eccentric shaft and a driving connecting shaft, the front end and the rear end of the rocker arm eccentric shaft are eccentrically arranged, the front end and the rear end of the driving connecting shaft are respectively provided with holes, and the front end hole and the rear end hole are eccentrically arranged; the front end of the rocker arm eccentric shaft is connected with a test system rocker arm, the rear end of the rocker arm eccentric shaft is matched and connected with a front end hole of the driving connecting shaft, and a rear end hole of the driving connecting shaft is connected with a driving device rotating shaft. By adopting the front and rear end eccentric structure of the rocker arm eccentric shaft and the front and rear end eccentric structure of the driving connecting shaft, the rocker arm eccentric shaft and the driving connecting shaft are connected to form a combined eccentric shaft design capable of changing the included angle in the eccentric direction, so that forced rolling oscillation with different amplitudes can be realized under the condition that parts are not replaced; and technical support is provided for the dynamic stability derivative wind tunnel test of the aircraft.

Description

TECHNICAL FIELD

[0001] The utility model relates to aircraft dynamic stability derivative wind tunnel test technical field especially, it is a eccentricity adjusting device. BACKGROUND

[0002] In aircraft dynamic stability derivative wind tunnel test, wind tunnel test model needs to carry out oscillation around the specified shaft, and there are two forms of free oscillation and forced oscillation. The free oscillation test method needs to give the model an initial angle of deflection in the oscillation direction, waits for the model to be free to decay to a certain degree under the action of aerodynamic force, and the single test takes a long time and has high test cost. The forced oscillation test method needs a system to drive the model to oscillate around the specified shaft at a given frequency and amplitude, and the existing forced oscillation system, for example, Chinese patent CN114061893A disclosed on February 18, 2022, mostly needs to replace parts to adjust the amplitude of oscillation, which is not conducive to rapid replacement of test state. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing an eccentricity adjusting device, which can realize forced rolling oscillation of different amplitudes without replacing parts, and provide technical support for aircraft dynamic stability derivative wind tunnel test.

[0004] The utility model provides an eccentricity adjusting device, which comprises a rocker arm eccentric shaft and a driving connecting shaft, the front end and the rear end of the rocker arm eccentric shaft are eccentrically arranged, the front end and the rear end of the driving connecting shaft are respectively provided with holes, and the front end hole and the rear end hole are eccentrically arranged; the front end of the rocker arm eccentric shaft is connected with a test system rocker arm, the rear end of the rocker arm eccentric shaft is connected with the front end hole of the driving connecting shaft, and the rear end hole of the driving connecting shaft is connected with a driving device rotating shaft.

[0005] Further, a connecting part is arranged on the rocker arm eccentric shaft, an arc-shaped mounting hole is arranged on the connecting part, a locking piece is movably arranged in the arc-shaped mounting hole, and the locking piece is connected with the driving connecting shaft.

[0006] Further, the arc length of the arc-shaped mounting hole is greater than the outer diameter of the locking piece.

[0007] Further, the locking piece comprises a screw, the front end of the driving connecting shaft is provided with a screw hole, and the rod part of the screw is threadedly connected in the screw hole through the arc-shaped mounting hole.

[0008] Further, the screw is a countersunk screw.

[0009] Further, the connecting part is annular, a plurality of arc-shaped mounting holes are annularly and intervally arranged on the connecting part.

[0010] Further, the connecting part is located at the joint of the front end and the rear end of the rocker arm eccentric shaft.

[0011] Further, the rear end of the rocker arm eccentric shaft is a cylindrical segment, and the front end hole of the driving connection shaft is a circular hole.

[0012] Further, the driving device comprises a motor.

[0013] Further, the eccentricity of the front end and the rear end of the rocker arm eccentric shaft is r1, the eccentricity of the front end hole and the rear end hole of the driving connection shaft is r2, the included angle of the eccentric direction of the rocker arm eccentric shaft and the driving connection shaft is δ, and the combined eccentricity r is:

[0014] The technical scheme of the utility model discloses a front and rear end eccentric structure of a rocker arm eccentric shaft and a front and rear end eccentric structure of a driving connection shaft, so that the rocker arm eccentric shaft and the driving connection shaft are connected to form a combined eccentric shaft design capable of changing the included angle of the eccentric direction, different amplitude forced rolling oscillation can be realized without replacing parts, and technical support is provided for aircraft dynamic stability derivative wind tunnel test. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a side view of the utility model;

[0018] Figure 3 It is the A-A sectional view of the utility model Figure 1 ;

[0019] Figure 4 It is the explosion schematic view of the rocker arm eccentric shaft and the driving connection shaft of the utility model;

[0020] Figure 5 It is the combined eccentricity r schematic view of the utility model;

[0021] Mark explanation:

[0022] 1- rocker arm eccentric shaft; 101- front end; 102- rear end; 103- connecting part;

[0023] 2 - drive connecting shaft; 201 - front end hole; 202 - rear end hole;

[0024] 3 - arc-shaped mounting hole; B1 - screw; B2 - motor; DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connected", "connection" should be broadly understood, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Embodiment 1

[0029] As Figure 1 - Figure 5The utility model provides a eccentricity adjusting device, including rocker arm eccentric shaft 1 and drive connecting shaft 2, the eccentricity of the front end 101 and rear end 102 between rocker arm eccentric shaft 1 is set, and the front end and rear end of drive connecting shaft 2 are equipped with hole respectively, and the eccentricity of front end hole 201 and rear end hole 202 is set, the front end 101 of rocker arm eccentric shaft 1 is connected with test system rocker arm, and the rear end 102 of rocker arm eccentric shaft 1 is connected with the front end hole 201 of drive connecting shaft 2, and the rear end hole 202 of drive connecting shaft 2 is connected with driving device rotating shaft.

[0030] Specifically, the device mainly includes rocker arm eccentric shaft 1 and drive connecting shaft 2. The front end 101 of the rocker arm eccentric shaft 1 is an output end, which is inserted into the inner hole of the rocker arm of the test system and connected with the rocker arm of the test system. The rear end 102 is a cylindrical segment, which is connected with the eccentric hole column of the front end of the drive connecting shaft 2. The drive connecting shaft 2 is concentric with the rotating shaft of the system driving device and is fixedly connected, so that the output of the driving device first undergoes the first eccentricity of the front end hole 201 and the rear end hole 202 of the drive connecting shaft 2, and then undergoes the second eccentricity of the front end 101 and the rear end 102 of the rocker arm eccentric shaft 1. The rocker arm eccentric shaft 1 and the drive connecting shaft 2 are eccentric to form a combined eccentric shaft, so that the uniform rotation of the drive connecting shaft 2 can drive the rotation of the combined eccentric shaft.

[0031] When the wind tunnel forced rolling oscillation test is carried out, the reduced scale model of the aircraft is installed in the small amplitude forced rolling oscillation eccentricity adjusting device test system. The motor B2 of the test system rotates at a constant speed to drive the combined eccentric shaft composed of the rocker arm eccentric shaft 1 and the drive connecting shaft 2 to rotate, and the stability of the motion of the combined eccentric shaft around the rolling axis under the specified working condition is studied.

[0032] Embodiment 2

[0033] The rocker arm eccentric shaft 1 is provided with a connecting portion 103, the connecting portion 103 is provided with an arc-shaped mounting hole 3, a locking piece is movably arranged in the arc-shaped mounting hole 3, and the locking piece is connected with the drive connecting shaft 2. The arc length of the arc-shaped mounting hole 3 is greater than the outer diameter of the locking piece. The locking piece includes a screw B1, the front end of the drive connecting shaft 2 is provided with a threaded hole, and the rod portion of the screw B1 is threadedly connected to the threaded hole through the arc-shaped mounting hole 3. The screw B1 is a countersunk screw B1. The connecting portion 103 is annular, and a plurality of arc-shaped mounting holes 3 are annularly and spacedly arranged on the connecting portion 103. The connecting portion 103 is located at the joint of the front end 101 and the rear end 102 of the rocker arm eccentric shaft 1. The rear end 102 of the rocker arm eccentric shaft 1 is a cylindrical segment, and the front end hole 201 of the drive connecting shaft 2 is a circular hole.

[0034] Specifically, the connecting part 103 is an annular flange structure connected to the connecting part of the rocker arm eccentric shaft 1 and the driving connecting shaft 2 and extending outward in the radial direction. The front end surface of the driving connecting shaft 2 is contacted through the annular connecting part 103, and the annular connecting part 103 is designed with a special-shaped mounting hole for enabling the locking part to move circumferentially along the arc-shaped track of the axis of the rear end 102 of the rocker arm eccentric shaft 1 and the front end hole 201 of the driving connecting shaft 2. When the screw B1 is locked, the rocker arm eccentric shaft 1 is fixedly connected to the driving connecting shaft 2; when the screw B1 is loosened, the rocker arm eccentric shaft 1 is rotated by different angles around the center line of the eccentric hole of the front end of the driving connecting shaft 2 through the arc-shaped mounting hole 3, so that the included angle of the eccentric directions of the rocker arm eccentric shaft 1 and the driving connecting shaft 2 can be changed, different combined eccentric distances r can be obtained, and then the screw B1 can be locked at a suitable angle position.

[0035] Embodiment 3

[0036] The driving device comprises a motor B2.

[0037] Specifically, the driving device adopts the motor B2 for driving, and additional mechanisms such as a speed changing device can be connected. The rear end hole 202 of the driving connecting shaft 2 is connected to the rotating shaft of the motor B2 of the test system through a key.

[0038] Embodiment 4

[0039] The eccentric distance between the front end 101 and the rear end 102 of the rocker arm eccentric shaft 1 is r1, the eccentric distance between the front end hole 201 and the rear end hole 202 of the driving connecting shaft 2 is r2, the included angle of the eccentric directions of the rocker arm eccentric shaft 1 and the driving connecting shaft 2 is δ, and the combined eccentric distance r is:

[0040] Specifically, the eccentric distance between the front end eccentric hole of the driving connecting shaft 2 and the center of the motor B2 is r2, the eccentric distance between the output end of the rocker arm eccentric shaft 1 and the cylindrical section is r1, and the included angle of the eccentric directions of the rocker arm eccentric shaft 1 and the driving connecting shaft 2 is δ, so that the combined eccentric distance r can be calculated as

[0041] Working mode and principle of the device:

[0042] The front end 101 of the rocker arm eccentric shaft 1 is connected with the test system rocker arm, and the rear end 102 is connected with the front end eccentric hole column of the driving connection shaft 2. The driving connection shaft 2 is concentric with the rotating shaft of the system driving motor B2 and is fixedly connected, so that the output of the driving device firstly passes through the eccentricity of the front end hole 201 and the rear end hole 202 of the driving connection shaft 2, and then passes through the eccentricity of the front end 101 and the rear end 102 of the rocker arm eccentric shaft 1, so that the rocker arm eccentric shaft 1 and the driving connection shaft 2 are eccentric to form a combined eccentric shaft, so that the uniform rotation of the driving connection shaft 2 can drive the combined eccentric shaft to rotate. When the screw B1 is locked, the rocker arm eccentric shaft 1 is fixedly connected with the driving connection shaft 2; when the screw B1 is loosened, the rocker arm eccentric shaft 1 is rotated by different angles around the center line of the front end eccentric hole of the driving connection shaft 2 through the arc-shaped mounting hole 3, so that the included angle of the eccentric direction of the rocker arm eccentric shaft 1 and the driving connection shaft 2 can be changed, and different combined eccentric distances r can be obtained.

[0043] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An eccentricity adjustment device, characterized by, The rocker arm eccentric shaft is eccentrically arranged between the front end and the rear end, and the front end and the rear end of the driving connecting shaft are respectively provided with holes, and the front hole and the rear hole are eccentrically arranged. The front end of the rocker arm eccentric shaft is connected with the test system rocker arm, the rear end of the rocker arm eccentric shaft is matched with the front hole of the driving connecting shaft, and the rear hole of the driving connecting shaft is connected with the driving device rotating shaft.

2. The eccentricity adjusting device according to claim 1, characterized in that The connecting part is arranged on the rocker arm eccentric shaft, the arc-shaped mounting hole is arranged on the connecting part, the locking part is movably arranged in the arc-shaped mounting hole, and the locking part is connected with the driving connecting shaft.

3. The eccentricity adjustment device of claim 2, wherein The arc length of the arc-shaped mounting hole is greater than the outer diameter of the locking part.

4. The eccentricity adjustment device of claim 3, wherein The locking part comprises a screw, the front end of the driving connecting shaft is provided with a screw hole, and the rod part of the screw is threadedly connected in the screw hole through the arc-shaped mounting hole.

5. The eccentricity adjustment device of claim 4, wherein The screw is a countersunk screw.

6. The eccentricity adjustment device of claim 3, wherein The connecting part is annular, and a plurality of arc-shaped mounting holes are annularly and spacedly arranged on the connecting part.

7. The eccentricity adjustment device of claim 3, wherein The connecting part is located at the joint of the front end and the rear end of the rocker arm eccentric shaft.

8. The eccentricity adjustment device of claim 1, wherein The rear end of the rocker arm eccentric shaft is a cylindrical segment, and the front hole of the driving connecting shaft is a circular hole.

9. The eccentricity adjustment device of claim 1, wherein The driving device comprises a motor.

10. The eccentricity adjustment device of claim 1, wherein The eccentricity of the front end and the rear end of the rocker arm eccentric shaft is r1, the eccentricity of the front end hole and the rear end hole of the driving connection shaft is r2, the angle between the eccentric direction of the rocker arm eccentric shaft and the driving connection shaft is δ, and the combined eccentricity r is:

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