Stability augmentation structure of variable pitch mechanism of aerial variable pitch propeller and propeller
By setting a limiting guide hole and a guide column structure on the pitch change disk, the thread gap between the pitch change screw and the pitch change nut is stabilized, which solves the problem of pitch change disk shaking and wear in the traditional pitch change mechanism and achieves higher pitch change accuracy and service life.
Patent Information
- Application Number
- CN202422782560.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-15
AI Technical Summary
In the pitch changing mechanism of traditional aerial variable pitch propellers, the threaded structure of the pitch screw and the pitch nut causes axial clearance and radial clearance, which causes the pitch disc to shake unstably during movement, making it impossible to accurately control the pitch angle of the blades, and it is severely worn after long-term use.
An axially penetrating limit guide hole is set on the pitch variable disk, and a guide column is slidably set in the limit guide hole. The guide column bears the rotational torque, stabilizes the thread gap between the pitch variable nut and the pitch variable lead screw, and combines with linear bearings to reduce the moving resistance of the pitch variable disk and improve the flatness and accuracy of the pitch variable movement.
The consistency of the blade angles in the variable-pitch propeller has been improved, and the angle error has been reduced from ±1° to ±0.15°, which has extended the service life and improved mechanical transmission efficiency.
Smart Images
Figure CN223457111U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to propeller technical field, concretely air pitch change propeller pitch change mechanism stabilizing structure and propeller. BACKGROUND
[0002] With the development of science and technology, the flight performance requirement of aircraft is more and more precise, the traditional air pitch change propeller pitch change mechanism is composed of pitch change screw rod, pitch change nut, pitch change disc and pitch change nut, the pitch change nut is embedded in the pitch change disc, as shown in Figure 1 The pitch change hub holds the pitch change screw rod axially to position, the drive drives the pitch change screw rod to rotate uniformly in two directions, the pitch change screw rod drives the pitch change nut to move axially, so that the pitch change disc moves axially, the pitch change disc sliding groove moves axially, drives the pitch change blade pin to move circumferentially to realize pitch change of the blade, as shown in Figure 2 .
[0003] The traditional pitch change screw rod and the pitch change nut need to meet the mechanical self-locking function, so a thread structure is adopted, in the non-working state of the drive, the pitch change disc is in the mechanical self-locking state, the propeller aerodynamic load is applied on the pitch change disc, and the pitch change screw rod will not rotate.
[0004] When the traditional pitch change mechanism rotates the pitch change screw rod, the internal thread of the pitch change nut in the pitch change disc also rotates in the same direction under the action of friction, and can only rely on the pitch change paddle handle root plane to stop rotating, as shown in Figure 3 When the propeller rotates and the pitch changes, the pitch change disc causes scratches on the pitch change paddle handle root plane during displacement, and long-time wear causes pitch change difficulty.
[0005] Based on the above structure, the axial gap and the radial gap of the thread structure of the pitch change screw rod and the pitch change nut will inevitably exist, which will cause the pitch change nut to shake in two directions during movement and be uncontrollable, as shown in Figure 4 When the pitch change nut rotates and the pitch change disc contacts the stop point, the axial gap and the radial gap change unevenly, the pitch change nut tilts to one side, so that the flatness of the pitch change disc during movement cannot be guaranteed, the control of different pitch change angles of the blades is uncontrollable, and the precision is low, the angle error between the blades in a set of pitch change propeller is about ±1°, as shown in Figure 5 . Utility model content
[0006] In view of the above defects in the prior art, the utility model aims at providing air pitch change propeller pitch change mechanism stabilizing structure and propeller.
[0007] In order to achieve the above object, the utility model adopts the following technical scheme:
[0008] The utility model provides a variable pitch mechanism of air variable pitch propeller, including variable pitch disc, the variable pitch disc is provided with at least two axial through limit guide hole, the limit guide hole is slidably arranged guide column.
[0009] Further, the limit guide hole is evenly distributed along the circumference of the variable pitch disc.
[0010] In a second aspect, the utility model provides an air variable pitch propeller, including the stabilizing structure of one aspect.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1, the utility model discloses a guide column is set to make variable pitch disc no longer rotate, will not shake, improve the flatness of variable pitch disc in the variable pitch movement process, improve the consistency of different blade angles in variable pitch propeller, from traditional blade angle error ± 1 DEG, promote to ± 0.15 DEG, and the greater the precision is improved with the greater diameter of the guide hole division circle.
[0013] 2, the utility model discloses a linear bearing is set up to reduce the resistance of variable pitch disc up and down movement, improve the service life, improve mechanical transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the schematic diagram of the variable pitch mechanism of traditional air variable pitch propeller;
[0015] Figure 2 It is the schematic diagram of the variable pitch disc axial displacement driving variable pitch pin circumferential motion;
[0016] Figure 3 It is the schematic diagram of the traditional variable pitch disc rotation stopping contact point;
[0017] Figure 4 It is the schematic diagram of thread gap;
[0018] Figure 5 It is the schematic diagram of the flatness of variable pitch disc motion process caused by thread gap;
[0019] Figure 6 It is the structural schematic diagram of the stabilizing structure of the utility model variable pitch mechanism of air variable pitch propeller.
[0020] Figure 6 1, variable pitch disc;2, guide column;3, variable pitch screw;4, variable pitch nut;5, linear bearing;6, upper limit piece;7, lower limit piece;8, lower positioning piece;9, upper positioning piece;10, blade variable pitch pin;11, propeller pin sliding sleeve;12, upper propeller hoop;13, lower propeller hoop;14, blade. DETAILED DESCRIPTION
[0021] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part 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 the present application.
[0022] Embodiment 1:
[0023] Please refer to Figure 6 The variable-pitch mechanism stabilizing structure of the airscrew provided by the present application comprises a variable-pitch disc 1, at least two sliding grooves are arranged on the outer wall of the variable-pitch disc 1 and used to be connected with a propeller pin sliding sleeve 11, the variable-pitch disc 1 is provided with a central through hole, a variable-pitch nut 4 is fixedly arranged in the central through hole, and the variable-pitch nut 4 is threadedly connected with a variable-pitch lead screw 3; the variable-pitch disc 1 is further provided with at least two axial through limiting guide holes, a linear bearing 5 is fixedly arranged in the limiting guide hole, and a guide column 2 is slidably arranged in the linear bearing 5; when the variable-pitch lead screw 3 rotates, the rotation torque borne by the variable-pitch nut 4 is borne by the guide column 2, so that the radial gap between the variable-pitch nut 4 and the variable-pitch lead screw 3 is stable, thereby the state of the variable-pitch disc 1 is stable, the angle error between the propeller blades 14 in the variable-pitch airscrew is reduced, and the variable-pitch precision is improved.
[0024] Specifically, the variable-pitch nut 4 is nested in the central through hole of the variable-pitch disc 1.
[0025] Specifically, the number of the limiting guide holes is the same as the number of the sliding grooves, that is, three guide columns 2 are needed for a three-blade airscrew, four guide columns 2 are needed for a four-blade airscrew, and so on according to the relationship between the number of the blades and the number of the guide columns; the limiting guide holes are evenly distributed along the circumference of the variable-pitch disc 1.
[0026] Specifically, the limiting guide hole is located between the maximum outer diameter d max and 1 / 2 of the maximum outer diameter d max , and the closer the position of the limiting guide hole to the maximum outer diameter d max , the higher the movement flatness of the variable-pitch disc 1 and the better the variable-pitch precision under the condition that the structural strength of the variable-pitch disc 1 meets the standard.
[0027] Specifically, the diameter of the guide column 2 needs to be calculated according to the propeller aerodynamic load applied to the torque of the variable-pitch disc 1, and needs to meet the condition that the bending deformation of the guide column is not more than 0.1 mm under the condition of double load.
[0028] Specifically, the length of the linear bearing 5 needs to be selected according to the thickness of the variable-pitch disc 1, and the longer the length within the allowable range, the higher the perpendicularity of the variable-pitch disc 1.
[0029] Further, the upper limiting part 6 and the lower limiting part 7 are provided, and the upper limiting part 6 and the lower limiting part 7 are T-shaped sleeves, and have a large diameter part and a small diameter part, and the outer diameter of the large diameter part is larger than the outer diameter of the variable pitch lead screw 3; the upper end outer wall of the variable pitch lead screw 3 is provided with an upper positioning step, and the lower end outer wall of the variable pitch lead screw 3 is provided with a lower positioning step; the inner wall of the large diameter part of the upper limiting part 6 is threadedly connected with the upper end of the variable pitch lead screw 3, and is positioned by the upper positioning step; the inner wall of the large diameter part of the lower limiting part 7 is threadedly connected with the lower end of the variable pitch lead screw 3, and is positioned by the lower positioning step; the upper limiting part 6 and the lower limiting part 7 limit the movement distance of the variable pitch disc 1.
[0030] Specifically, the upper limiting part 6 and the lower limiting part 7 are connected in an interference fit with the variable pitch lead screw 3, and the key transmits the torque.
[0031] Further, the lower positioning part 8 and the upper positioning part 9 are provided, the upper positioning part 9 is connected with the outer wall of the small diameter part of the upper limiting part 6 through an upper bearing, the upper positioning part 9 is fixedly connected with the upper end of the guide column 2, the lower positioning part 8 is connected with the outer wall of the small diameter part of the lower limiting part 7 through a lower bearing, and the lower positioning part 8 is fixedly connected with the lower end of the guide column 2.
[0032] Specifically, the upper positioning part 9 is fixedly connected with the guide column 2 through a flange and a bolt, and the lower positioning part 8 is interference-inserted with the guide column 2.
[0033] Variable pitch mechanism stability increasing structure principle:
[0034] The angle error of each blade of a set of variable pitch propellers is caused by the thread gap between the variable pitch lead screw 3 and the variable pitch nut 4, which is divided into a radial gap and an axial gap, and the two-way gap causes the variable pitch disc 1 to tilt during movement. The variable pitch mechanism stability increasing structure stabilizes the axial gap and the radial gap of the thread by preventing the variable pitch disc 1 from rotating, improves the disc flatness during variable pitch movement, and thus controls the angle error of each blade of a set of variable pitch propellers.
[0035] Embodiment 2:
[0036] Based on embodiment 1, the aerial variable pitch propeller provided in the embodiment further includes the upper prop hoop 12, the lower prop hoop 13, and the blade 14, the upper prop hoop 12 and the lower prop hoop 13 are fixedly connected through a bolt and a nut, the upper end of the upper prop hoop 12 is provided with an opening, the center of the lower prop hoop 13 is provided with an opening, the upper positioning part 9 is fixedly connected with the opening at the upper end of the upper prop hoop 12 through a bolt, the lower positioning part 8 is interference-inserted with the opening at the center of the lower prop hoop 13 and is positioned through a step; the root of the blade 14 is provided with a blade variable pitch pin 10, the blade variable pitch pin 10 is sleeved with a prop pin sliding sleeve 11, and the prop pin sliding sleeve 11 is slidingly arranged in a sliding groove of the variable pitch disc 1.
[0037] The angle error between each blade 14 of the variable pitch propeller is ±0.15° by the stabilizing structure.
[0038] Specifically, the propeller pin sliding sleeve 11 is a nylon or copper sliding block.
[0039] In the present application, the parts not discussed in detail, the connection mode of each part in the present application, all belong to the known technology in the technical field. Direct application can be used, and will not be described again.
[0040] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0041] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship 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 device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.
[0042] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0043] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A stabilizing structure for a variable-pitch mechanism of an air variable-pitch propeller, comprising a variable-pitch disc, characterized in that, The variable-pitch disc is provided with at least two axial through limiting guide holes; A linear bearing is fixedly arranged in the limiting guide hole, and a guide column is slidably arranged in the linear bearing.
2. The over-the-air variable pitch propeller pitch mechanism stability augmentation structure of claim 1, wherein, The limiting guide holes are uniformly distributed along the circumference of the variable-pitch disc.
3. A variable pitch airscrew, characterised in that, The stabilizing structure of claim 1 or 2 is included.