CN115371937A

CN115371937A - Tail boom model roll angle adjusting mechanism

Info

Publication number: CN115371937A
Application number: CN202210854714.3A
Authority: CN
Inventors: 李强; 邵天双; 王鑫炎
Original assignee: AVIC Aerodynamics Research Institute
Current assignee: AVIC Aerodynamics Research Institute
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-11-22

Abstract

The invention discloses a tail support model roll angle adjusting mechanism which comprises a roll shaft, a flange, an outer sleeve, a hydraulic expansion sleeve, a front angle contact ball bearing, a rear angle contact ball bearing, a worm gear, a worm, two groups of deep groove ball bearings and a tail support adapter. When the hydraulic expansion sleeve is tensioned, the contact surface of the rolling shaft and the hydraulic expansion sleeve is attached and locked, and the rolling angle of the tail boom model is fixed; when the hydraulic expansion sleeve is loosened, the contact surface of the rolling shaft and the hydraulic expansion sleeve is separated, the rotating worm drives the rolling shaft to rotate, and then the change of the rolling angle of the tail boom model is realized. The invention can lock, fix and accurately change the roll angle of the tail boom model, and provides reliable test equipment for wind tunnel tests.

Description

Tail boom model roll angle adjusting mechanism

Technical Field

The invention belongs to the field of wind tunnel tests, and particularly relates to a tail boom model roll angle adjusting mechanism.

Background

The wind tunnel test is a scaling simulation of a real physical world, and is a main way and the most basic and important means for determining an aircraft aerodynamic layout scheme, predicting the aerodynamic characteristics of the aircraft, providing original design data, verifying the aerodynamic design idea and exploring new aerodynamic concepts, new theories and new technologies.

At present, model support systems in wind tunnels at home and abroad mainly comprise tail braces, ventral braces, back braces, bracing wire supports and the like, wherein the tail braces are main force model support systems of a plurality of production type wind tunnels and can be used for carrying out various model force and pressure measuring wind tunnel tests, function tests of models and auxiliary power components, static tests of power models, calibration in balance tunnels, functional verification tests and the like. Because the tested model weight and aerodynamic load are also increasingly large, particularly for a full-size wind tunnel tail boom model, a roll angle adjusting mechanism is needed for fixing and changing the roll angle of the tail boom model during the wind tunnel test and ensuring the smooth operation of the wind tunnel test.

Disclosure of Invention

The invention aims to provide a tail boom model roll angle adjusting mechanism which can lock, fix and accurately change the roll angle of a tail boom model in a wind tunnel test.

The technical scheme adopted by the invention is as follows: a tail support model roll angle adjusting mechanism comprises a roll shaft, a flange, an outer sleeve, a hydraulic expansion sleeve, a front angle contact ball bearing, a rear angle contact ball bearing, a worm gear, a worm, two groups of deep groove ball bearings and a tail support adapter, wherein the tail end of the tail support adapter is fixedly connected with a tail support mechanism in a wind tunnel, the front end of the tail support adapter is fixedly connected with the outer sleeve and is positioned by adopting a straight opening in a matched manner, the hydraulic expansion sleeve is arranged in the outer sleeve, the contact surface of the hydraulic expansion sleeve is in over-matched manner, the front end of the hydraulic expansion sleeve is sleeved with the front angle contact ball bearing and a front retaining ring of the hydraulic expansion sleeve, the rear end of the hydraulic expansion sleeve is sleeved with the rear angle contact ball bearing and the rear retaining ring of the hydraulic expansion sleeve, the front angle contact ball bearing and the rear angle contact ball bearing are arranged in a face-to-face manner, the front end of the outer sleeve is compressed by the flange, the inner ring surface of the hydraulic expansion sleeve is provided with the roll shaft, the contact surface of the roll shaft is in clearance fit and is supported by the front angle contact ball bearing and the rear angle contact ball bearing retaining ring is axially fixed by a bearing locking nut; the step face and the worm wheel of roll-over axle tail end before the terminal surface laminating, the worm wheel rear end face carry out axial locking fixedly through worm wheel lock nut and roll-over axle tail end and tail boom adapter contact site install two sets of deep groove ball bearings, the worm install on the tail boom adapter, and with the worm wheel cooperate the transmission, roll-over axle front end pass through branch and wind tunnel test tail boom model fixed connection.

Further, when the hydraulic expansion sleeve is tensioned, the contact surface of the rolling shaft and the hydraulic expansion sleeve is attached and locked, the rolling angle of the tail support model is fixed, and a wind tunnel test is carried out; when the hydraulic expansion sleeve is loosened, the contact surface of the rolling shaft and the hydraulic expansion sleeve is separated, the rolling shaft fixedly connected with the worm wheel is driven to rotate by rotating the worm, and then the rolling angle of the tail boom model is changed.

The invention has the advantages and beneficial effects that: the tail boom model roll angle adjusting mechanism can lock, fix and accurately change the tail boom model roll angle in the wind tunnel test, and provides reliable test equipment for the wind tunnel test. The method has practical significance for adjusting and stably operating the model roll angle of the large-mass and atmospheric dynamic load supporting equipment in some wind tunnels, and has very wide application prospect.

Drawings

Fig. 1 is a schematic structural view of a roll angle adjusting mechanism of a tail boom model.

Detailed Description

The technical scheme of the invention is further explained by taking the following specific examples together with the drawings in the specification.

Example 1

As shown in fig. 1, a tail boom model roll angle adjusting mechanism comprises a roll shaft 1, a flange 2, an outer sleeve 3, a hydraulic expansion sleeve 4, a front angle contact ball bearing 5-1, a rear angle contact ball bearing 5-2, a worm wheel 7, a worm 15, two groups of deep groove ball bearings 9 and a tail boom adapter 10, wherein the tail end of the tail boom adapter 10 is fixedly connected with a tail boom mechanism in a wind tunnel, the tail boom adapter 10 is a bearing base of the whole mechanism, and the front end of the tail boom adapter 10 is fixedly connected with the outer sleeve 3 through screws and is matched and positioned by adopting a straight opening to bear shearing force; the hydraulic expansion sleeve 3 is internally provided with a hydraulic expansion sleeve 4, the contact surface of the hydraulic expansion sleeve 4 is in over fit, the front end of the hydraulic expansion sleeve 4 is sleeved with a front angle contact ball bearing 5-1 and a front hydraulic expansion sleeve retaining ring 12, the rear end of the hydraulic expansion sleeve 4 is sleeved with a rear angle contact ball bearing 5-2 and a rear hydraulic expansion sleeve retaining ring 13, the front angle contact ball bearing 5-1 and the rear angle contact ball bearing 5-2 are arranged in a face-to-face manner and are used for bearing bidirectional axial load, the front end of the outer sleeve 3 is compressed through a flange 2, the hydraulic expansion sleeve 4, the front angle contact ball bearing 5-1, the rear angle contact ball bearing 5-2, the front hydraulic expansion sleeve retaining ring 12 and the rear hydraulic expansion sleeve retaining ring 13 are connected and fixed together in series, the inner ring surface of the hydraulic expansion sleeve 4 is provided with a rolling shaft 1, the contact surface of the hydraulic expansion sleeve is in clearance fit, the front angle contact ball bearing 5-1 and the rear angle contact ball bearing 5-2 are used for supporting so as to increase the overall rigidity and simultaneously bear bending moment, the bearing inner ring retaining ring 14 is arranged on the inner ring of the inner ring surface of the inner ring of the rear angle contact ball bearing 5-2, and the locking nut 6 is used for fixing the bearing so that the rolling sleeve 4 to enable the axial expansion sleeve to be incapable of the axial expansion sleeve to bear the axial load in a rolling test state and generate the axial load, and the axial expansion test model of the axial expansion sleeve 4, and the axial expansion sleeve, and the axial expansion test; the step face of 1 tail end of roll-over axle and worm wheel 7 preceding terminal surface laminating, 7 rear end faces of worm wheel carry out axial locking fixedly through worm wheel lock nut 8 and roll-over axle 1 tail end and heel brace adapter 10 contact site install two sets of deep groove ball bearings 9, worm 15 install on heel brace adapter 10, and with worm wheel 7 cooperate the transmission, 1 front end of roll-over axle pass through branch and wind tunnel test heel brace model fixed connection.

When the hydraulic expansion sleeve 4 is expanded, the contact surface of the rolling shaft 1 and the hydraulic expansion sleeve 4 is attached and locked, the rolling angle of the tail boom model is fixed, and a wind tunnel test is carried out; when the hydraulic expansion sleeve 4 is loosened, the contact surface of the rolling shaft 1 and the hydraulic expansion sleeve 4 is separated, and the rolling shaft 1 fixedly connected with the worm wheel 7 is driven to rotate by rotating the worm 15, so that the change of the rolling angle of the tail boom model is realized.

The tail boom model roll angle adjusting mechanism of the embodiment can lock, fix and accurately change the roll angle of a wind tunnel test model, and provides reliable test equipment for a wind tunnel test.

Claims

1. The utility model provides a tail boom model roll angle guiding mechanism, includes that axle, flange, overcoat, hydraulic pressure rise set, anterior angle contact ball bearing, back angle contact ball bearing, worm wheel, worm, two sets of deep groove ball bearing and tail boom adapter, its characterized in that roll over: the tail end of the tail support adapter is fixedly connected with a tail support mechanism in a wind tunnel, the front end of the tail support adapter is fixedly connected with an outer sleeve and is positioned in a matched mode through a straight opening, a hydraulic expansion sleeve is installed inside the outer sleeve, the contact surface of the hydraulic expansion sleeve is in over-fit, the front end of the hydraulic expansion sleeve is sleeved with a front angular contact ball bearing and a front retaining ring of the hydraulic expansion sleeve, the rear end of the hydraulic expansion sleeve is sleeved with a rear angular contact ball bearing and a rear retaining ring of the hydraulic expansion sleeve, the front angular contact ball bearing and the rear angular contact ball bearing are arranged in a face-to-face mode, the front end of the outer sleeve is compressed through a flange, a rolling shaft is installed on the inner ring surface of the hydraulic expansion sleeve, the contact surface of the rolling shaft is in clearance fit and supported through the front angular contact ball bearing and the rear angular contact ball bearing, and the inner ring retaining ring of the rear angular contact ball bearing is arranged on the inner ring end surface of the inner ring of the rear angular contact ball bearing and is axially fixed and locked through a bearing locking nut; the step face of roll axle tail end and the laminating of terminal surface before the worm wheel, the worm wheel rear end face carry out axial locking through worm wheel lock nut and roll axle and fix roll axle tail end and tail boom adapter contact position install two sets of deep groove ball bearings, the worm install on the tail boom adapter, and with the worm wheel cooperate the transmission, roll axle front end pass through branch and wind-tunnel test tail boom model fixed connection.

2. The tail boom model roll angle adjustment mechanism of claim 1, wherein: when the hydraulic expansion sleeve is tensioned, the contact surface of the rolling shaft and the hydraulic expansion sleeve is attached and locked, the rolling angle of the tail boom model is fixed, and a wind tunnel test is carried out; when the hydraulic expansion sleeve is loosened, the contact surface of the rolling shaft and the hydraulic expansion sleeve is separated, the rolling shaft fixedly connected with the worm wheel is driven to rotate by rotating the worm, and then the rolling angle of the tail boom model is changed.