Helicopter pitch adjustment mechanism

Abstract

The embodiment of the present invention provides a helicopter pitch adjustment mechanism, which comprises: a steering gear (1), a reducer housing (2), and a universal joint (3); the steering gear (1) comprises a columnar base (110); at least two connecting plates (210) are fixedly arranged in parallel at the bottom of the reducer housing (2), and the connecting plates (210) are provided with connecting through holes (220), wherein the center lines of the connecting through holes (220) of the connecting plates (210) are collinear; the universal joint (3) is sleeved on the columnar base (110) of the steering gear (1), the universal joint (3) is arranged between the at least two connecting plates (210) of the reducer housing (2), and the universal joint (3) is connected to the connecting through hole (220) of the connecting plate (210) through a connecting rod. By using the helicopter pitch adjustment mechanism provided by the embodiment of the present invention, the probability of deformation at the connection between the steering gear and the reducer can be reduced, and the accuracy of the steering gear in adjusting the blade pitch can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of helicopters, and in particular to a helicopter pitch regulating mechanism. Background Art

[0002] During the flight of a helicopter, it is necessary to control the pitch of the blades to change the flight states of the helicopter such as take-off, crawling, forward flight, backward flight, turning, landing, etc. In the prior art, a servo-swash plate structure is usually used to control the pitch of the helicopter blades.

[0003] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the structure of the blade pitch adjustment mechanism used in the prior art, the top of the screw rod of the servo 1a is connected to the swash plate 4a through a rod end bearing, and the bottom of the servo 1a is connected to the reducer housing 2a. Specifically, as Figure 2 As shown, two parallel connection seats 110a are fixedly arranged at the bottom of the servo 1a, and the connection seats 110a are provided with connection holes 120a. The annular columnar shock-absorbing pad 130a is sleeved in the connection hole of the reducer housing 2a, and the connection sleeve 140a passes through the connection hole 120a of the connection seat 110a of the servo 1a and the inner ring of the shock-absorbing pad 130a in sequence to connect the servo 1a with the reducer housing 2a; wherein, the inner and outer rings of the shock-absorbing pad 130a are made of rubber.

[0004] like Figure 1 and Figure 2 As shown, the extension and retraction of the screw rod of the servo motor 1a drives the swash plate 4a to move, thereby adjusting the pitch of the propeller blades installed on the swash plate. In the process of the servo motor 1a driving the swash plate 4a to move, the servo motor 1a can rotate around the central axis of the shock-absorbing pad 130a, and the deformation of the rubber between the inner and outer rings of the shock-absorbing pad 130a can be used to achieve the left and right micro-swing of the servo motor 1a, so that the servo motor 1a can adjust its position according to the movement of the swash plate 4a, ensuring that the servo motor 1a adjusts the pitch of the propeller blades.

[0005] However, the reliability of the rubber between the inner and outer rings of the shock-absorbing pad used in the prior art is poor and is greatly affected by temperature. At high temperatures, the rubber is easily melted and ineffective, and is easily worn. The deformation of the rubber between the inner and outer rings will cause deformation at the connection between the steering gear and the reducer housing, thereby affecting the accuracy of the steering gear in adjusting the blade pitch. Summary of the invention

[0006] The purpose of the embodiment of the present invention is to provide a helicopter pitch adjustment mechanism to reduce the probability of deformation at the connection between the steering gear and the reducer, thereby improving the accuracy of the steering gear in adjusting the blade pitch. The specific technical solution is as follows:

[0007] The embodiment of the present invention provides a helicopter pitch adjustment mechanism, which includes: a steering gear, a reducer housing, and a universal joint;

[0008] The steering gear comprises a columnar base;

[0009] At least two connecting plates are fixedly arranged in parallel at the bottom of the reducer housing, and connecting through holes are arranged on the connecting plates, wherein the center lines of the connecting through holes of the connecting plates are collinear;

[0010] The universal joint is sleeved on the columnar base of the steering gear, and the universal joint is arranged between at least two connecting plates of the reducer housing. The connecting through holes of the universal joint and the connecting plates are connected through connecting rods.

[0011] Optionally, the universal joint comprises an annular steering seat and at least two first steering seat connecting rods;

[0012] The annular steering seat is sleeved on the columnar base of the steering gear, and the annular steering seat is arranged between at least two connecting plates of the reducer housing;

[0013] The at least two first steering seat connecting rods are fixedly connected to the annular steering seat after passing through the connecting through holes respectively, and the diameter of the at least two first steering seat connecting rods is smaller than the diameter of the connecting through holes.

[0014] Optionally, the universal joint further comprises at least two second steering seat connecting rods; the annular steering seat is provided with at least one pair of radial through holes, and the center lines of the two through holes of each pair of radial through holes in the at least one pair of radial through holes are collinear;

[0015] The at least two second steering seat connecting rods are respectively passed through two through holes whose center lines are collinear with each other in the annular steering seat, and are fixedly connected to the columnar base of the steering gear, and the diameter of each of the second steering seat connecting rods is smaller than the diameter of the through hole of the annular steering seat;

[0016] There is a gap between the annular steering seat and the columnar base;

[0017] The center line of the through hole of the annular steering seat through which the at least two second steering seat connecting rods pass is perpendicular to the center line of the connecting through hole of the reducer housing, and the center line of the annular steering seat through hole and the center line of the connecting through hole of the reducer housing are both perpendicular to the telescopic direction of the servo screw.

[0018] Optionally, the universal joint further comprises a first shock-absorbing sleeve, which is fixedly mounted in a connecting through hole of the reducer housing, and a diameter of each steering seat connecting rod is smaller than an inner diameter of the first shock-absorbing sleeve.

[0019] Optionally, the first steering seat connecting rod and the second steering seat connecting rod are both bolts; the first steering seat connecting rod is threadedly connected to the annular steering seat; and the second steering seat connecting rod is threadedly connected to the columnar base of the servo.

[0020] Optionally, the universal joint further comprises a second shock-absorbing sleeve, which is fixedly mounted in a through hole of the annular steering seat through which the second steering seat connecting rod passes, and a diameter of the second steering seat connecting rod is smaller than an inner diameter of the second shock-absorbing sleeve.

[0021] Optionally, the columnar base of the servo is a cylindrical base.

[0022] Optionally, the mechanism further includes a swash plate, and the top end of the screw rod of the servo engine is connected to the swash plate via a rod end bearing.

[0023] Optionally, the mechanism further includes an anti-torsion arm, one end of which is connected to the swash plate, and the other end of which is connected to the reducer housing.

[0024] The helicopter pitch adjustment mechanism provided by the embodiment of the present invention comprises: a steering gear, a reducer housing, and a universal joint; wherein the steering gear comprises a columnar base; at least two connecting plates are fixedly arranged in parallel at the bottom of the reducer housing, and connecting through holes are arranged on the connecting plates, and the center lines of the connecting through holes of the connecting plates are collinear; the universal joint is sleeved on the columnar base of the steering gear, and the universal joint is arranged between at least two connecting plates of the reducer housing, and the connecting through holes of the universal joint and the connecting plates are connected by a connecting rod.

[0025] In the embodiment of the present invention, a universal joint is used to connect the reducer housing and the steering gear, which ensures that the steering gear can adjust its position according to the movement of the swash plate, and at the same time reduces the probability of deformation at the connection between the steering gear and the reducer, thereby improving the accuracy of the steering gear in adjusting the blade pitch. In addition, after the universal joint is sleeved on the steering gear base and connected to the reducer housing, the connecting seat at the bottom of the steering gear can be omitted, so that the steering gear is reduced in size and weight, saves space, and the entire adjustment mechanism is more compact and more reliable. Of course, any product or method implementing the present invention does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1It is a structural schematic diagram of a blade pitch adjustment mechanism used in the prior art;

[0028] Figure 2 It is a structural schematic diagram of a steering gear used in the prior art;

[0029] Figure 3 A schematic diagram of the structure of a helicopter pitch adjustment mechanism provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a partial explosion structure of a helicopter pitch adjustment mechanism provided by an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the structure of a helicopter pitch adjustment mechanism after assembly provided by an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the structure of a helicopter pitch adjustment mechanism and blades after installation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to reduce the probability of deformation at the connection between the servo and the reducer, thereby improving the accuracy of the servo's adjustment of the blade pitch, an embodiment of the present invention provides a helicopter pitch adjustment mechanism. The helicopter pitch adjustment mechanism provided by the embodiment of the present invention is introduced below.

[0035] It should be noted that the helicopter pitch adjustment mechanism provided by the embodiment of the present invention can be applied to various types of helicopters such as military helicopters, civilian helicopters, and model helicopters.

[0036] like Figure 3 As shown, a helicopter pitch adjustment mechanism provided by an embodiment of the present invention may include: a steering gear 1, a reducer housing 2, and a universal joint 3; the steering gear 1 includes a columnar base 110; at least two connecting plates 210 are fixedly and parallelly arranged at the bottom of the reducer housing 2, and connecting through holes 220 are arranged on the connecting plates 210, wherein the center lines of the connecting through holes 220 of the connecting plates 210 are collinear; the universal joint 3 is sleeved on the columnar base 110 of the steering gear 1, and the universal joint 3 is arranged between the at least two connecting plates 210 of the reducer housing 2, and the universal joint 3 is connected to the connecting through holes 220 of the connecting plates 210 through a connecting rod.

[0037] The universal joint 3 refers to a component that can realize shaft power output in different directions. The universal joint 3 can be, for example, a cross-axis universal joint, a ball-insert universal joint, a ball-cage universal joint, etc.

[0038] As an implementation of the embodiment of the present invention, two connecting plates 210 can be fixedly arranged in parallel at the bottom of the reducer housing 2. In this way, conditions can be provided for the connection between the steering gear 1 and the reducer housing 2, and space and materials can be saved.

[0039] As an implementation of the embodiment of the present invention, more than two connecting plates 210 may be fixedly arranged in parallel at the bottom of the reducer housing 2 to provide conditions for the connection between the servo 1 and the reducer housing 2.

[0040] In the helicopter pitch adjustment mechanism provided by the embodiment of the present invention, when the servo 1 is extended and retracted up and down, the columnar base 110 of the servo 1 is rigidly connected to the reducer housing 2 through the universal joint 3. The universal joint 3 can not only enable the servo 1 to rotate around the center line of the connecting through hole 220 of the reducer housing 2, but also enable the servo 1 to swing left and right between at least two connecting plates 210, thereby flexibly adjusting the position of the servo 1 to prevent the servo 1 from getting stuck.

[0041] Since the universal joint 3 is a rigid component, the helicopter pitch adjustment mechanism provided by the embodiment of the present invention can reduce the probability of deformation at the connection between the steering gear 1 and the reducer, thereby improving the accuracy of the steering gear 1 in adjusting the blade pitch.

[0042] It can be understood that the existing universal joint is usually a two-end connection type universal joint. When the existing universal joint is used to connect two components, the two connected components need to be connected to the two ends of the universal joint respectively. Therefore, in the embodiment of the present invention, when the universal joint 3 provided by the prior art is used to connect the servo 1 and the reducer housing 2, the reducer housing 2 and the servo 1 need to be connected to the two ends of the universal joint 3 respectively. In addition, the universal joint 3 itself also needs to occupy a certain space, which results in a large space occupied at the connection between the servo 1 and the reducer housing 2, so that the servo 1 is far away from the center of gravity of the reducer, and the adjustment accuracy is not high.

[0043] Therefore, if Figure 4As shown, in one implementation of the embodiment of the present invention, the universal joint 3 may include an annular steering seat 310 and at least two first steering seat connecting rods 320. The annular steering seat 310 is sleeved on the columnar base 110 of the servo 1, and the annular steering seat 310 is arranged between at least two connecting plates 210 of the reducer housing 2; the at least two first steering seat connecting rods 320 are respectively passed through the connecting through holes 220 and fixedly connected to the annular steering seat 310, and the diameter of the at least two first steering seat connecting rods 320 is smaller than the diameter of the connecting through holes 220.

[0044] In the embodiment of the present invention, since the diameter of the first steering seat connecting rod 320 is smaller than the diameter of the connecting through hole 220 , the first steering seat connecting rod 320 can rotate in the connecting through hole 220 , thereby enabling the steering gear 3 to rotate around the center line of the connecting through hole 220 .

[0045] The annular structure universal joint 3 adopted in the embodiment of the present invention can be mounted on the columnar base 110 of the servo 1, and the annular structure universal joint 3 itself only needs to occupy a very small space, thereby making the structure of the connection between the servo and the reducer housing more compact, making the servo closer to the center of gravity of the reducer, and improving the pitch adjustment accuracy.

[0046] In practical applications, a plurality of steering gears 1 may be distributed along the circumference of the reducer housing 2. For example, three or four steering gears 1 may be evenly distributed along the circumference of the reducer housing 2. Those skilled in the art may select the number of steering gears according to actual needs, and this application does not make any specific limitation thereto.

[0047] In order to further save the space occupied by the connection between the servo 1 and the reducer housing 2, in one implementation of the embodiment of the present invention, the universal joint 3 may also include at least two second steering seat connecting rods 330; the annular steering seat 310 is provided with at least one pair of radial through holes, and the center lines of the two through holes of each pair of radial through holes in the at least one pair of radial through holes are collinear.

[0048] The at least two second steering seat connecting rods 330 are respectively passed through the two centerline colinear through holes of the annular steering seat 310 and are fixedly connected to the columnar base 110 of the servo 1. The diameter of each second steering seat connecting rod 330 is smaller than the diameter of the through hole of the annular steering seat 310. There is a gap between the annular steering seat 310 and the columnar base 110.

[0049] The center line of the through hole of the annular steering seat 310 through which the at least two second steering seat connecting rods 330 pass is perpendicular to the center line of the connecting through hole 220 of the reducer housing 2, and the center line of the through hole of the annular steering seat 310 and the center line of the connecting through hole 220 of the reducer housing 2 are both perpendicular to the extension and retraction direction of the screw rod of the servo 1.

[0050] The gap between the annular steering seat 310 and the columnar base 110 can be specifically set according to the swing amplitude of the steering gear 1 between the at least two connecting plates 210 of the reducer housing 2. For example, if the swing amplitude of the steering gear 1 between the at least two connecting plates 210 of the reducer housing 2 is large, the gap can be increased; if the swing amplitude of the steering gear 1 between the at least two connecting plates 210 of the reducer housing 2 is small, the gap can be reduced. The present application does not specifically limit the gap.

[0051] The above structure is used to connect the annular steering seat 310 and the steering gear 1 with the second steering seat connecting rod 330. Since the diameter of each second steering seat connecting rod 330 is smaller than the diameter of the through hole of the annular steering seat 310, and there is a gap between the annular steering seat 310 and the columnar base 110, the steering gear 1 can rotate around the center line of the through hole of the annular steering seat 310, that is, the steering gear 1 can rotate around the center line of the second steering seat connecting rod 330, thereby realizing the swing of the steering gear 1 between at least two connecting plates 210 of the reducer housing 2. The above structure is simple and compact, and further saves the space occupied by the connection between the steering gear 1 and the reducer housing 2.

[0052] In order to facilitate the processing and assembly of the steering gear 1 , the columnar base 110 of the steering gear 1 may be a cylindrical base.

[0053] To facilitate disassembly and improve the reuse rate of various components, in one implementation of the embodiment of the present invention, the above-mentioned first steering seat connecting rod 320 and the above-mentioned second steering seat connecting rod 330 can both be bolts; the above-mentioned first steering seat connecting rod 320 and the above-mentioned annular steering seat 310 can be threadedly connected; the above-mentioned second steering seat connecting rod 330 and the columnar base 110 of the servo 1 can be threadedly connected.

[0054] In practical applications, threaded connection has the advantages of easy disassembly and high component reusability. Therefore, the above technical solution facilitates the disassembly of various components and can also improve the reusability of various components.

[0055] In actual application, the frequency of pitch adjustment of the steering gear 1 is very high, so the connection between the steering gear 1 and the reducer housing 2 wears very quickly. Therefore, in order to reduce the wear on the reducer housing 2, in one implementation of the embodiment of the present invention, the universal joint 3 may also include a first shock-absorbing sleeve 340, which is fixedly sleeved in the connecting through hole 220 of the reducer housing 2, and the diameter of each steering seat connecting rod 320 is smaller than the inner diameter of the first shock-absorbing sleeve 340.

[0056] In order to reduce the wear on the annular steering seat 310, in one implementation of the embodiment of the present invention, the above-mentioned universal joint 3 may also include a second shock-absorbing sleeve 350, and the above-mentioned second shock-absorbing sleeve 350 is fixedly sleeved in the through hole of the annular steering seat 310 through which the above-mentioned second steering seat connecting rod 330 passes. In order to realize the left and right swing of the steering gear 1, a gap should be left between the second steering seat connecting rod 330 and the second shock-absorbing sleeve 350. Therefore, the diameter of the above-mentioned second steering seat connecting rod 330 can be smaller than the inner diameter of the above-mentioned second shock-absorbing sleeve 350.

[0057] When the damping sleeve is provided, the worn part is the damping sleeve, rather than the complicated reducer housing 2 or the annular steering seat 310. When replacing parts, only the worn damping sleeve needs to be replaced, thereby extending the service life of the reducer housing 2 and the annular steering seat 310 and reducing the cost of parts replacement.

[0058] In practical applications, it is necessary to change the inclination angle of the helicopter blades to adjust the helicopter pitch. Figure 5 As shown, the helicopter pitch adjustment mechanism may further include a swash plate 4, and the top end of the screw rod of the servo 1 is connected to the swash plate 4 via a rod end bearing.

[0059] In actual operation, the swash plate 4 will tilt at different angles through the extension and retraction of the screw rod of the servo 1. The tilt angle of the swash plate can be controlled by controlling the extension and retraction amount of the screw rod of the servo 1. Figure 6 As shown, the blades 6 are mounted on the swash plate 4. As the inclination angle of the swash plate 4 changes, the inclination angle of the blades 6 will also change accordingly, thereby achieving adjustment of the pitch.

[0060] In practical applications, when the swash plate 4 is twisted, the pitch adjustment accuracy of the servo 1 will be reduced. Therefore, in one implementation of the embodiment of the present invention, the helicopter pitch adjustment mechanism may further include an anti-torsion arm 5, one end of which is connected to the swash plate 4 and the other end is connected to the reducer housing 2. The provision of the anti-torsion arm 5 can reduce the amplitude and probability of the swash plate twisting, thereby improving the pitch adjustment accuracy of the servo 1.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0062] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A helicopter pitch adjustment mechanism, comprising: A steering gear (1), a reducer housing (2), characterized in that it also includes a universal joint (3); The steering gear (1) comprises a columnar base (110), and the columnar base (110) of the steering gear (1) is a cylindrical base; At least two connecting plates (210) are fixedly arranged in parallel at the bottom of the reducer housing (2), and connecting through holes (220) are provided on the connecting plates (210), wherein the center lines of the connecting through holes (220) of the connecting plates (210) are collinear; The universal joint (3) is sleeved on a columnar base (110) of the steering gear (1), the universal joint (3) is arranged between at least two connecting plates (210) of the reducer housing (2), and the connecting through hole (220) of the universal joint (3) and the connecting plate (210) are connected via a connecting rod; The universal joint (3) comprises an annular steering seat (310) and at least two first steering seat connecting rods (320); The annular steering seat (310) is sleeved on the columnar base (110) of the steering gear (1), and the annular steering seat (310) is arranged between at least two connecting plates (210) of the reducer housing (2); After passing through the connecting through holes (220), the at least two first steering seat connecting rods (320) are fixedly connected to the annular steering seat (310); the diameter of the at least two first steering seat connecting rods (320) is smaller than the diameter of the connecting through holes (220).

2. The mechanism according to claim 1, characterized in that: The universal joint (3) further comprises at least two second steering seat connecting rods (330); the annular steering seat (310) is provided with at least one pair of radial through holes, and the center lines of the two through holes of each pair of the at least one pair of radial through holes are collinear; The at least two second steering seat connecting rods (330) are respectively passed through two through holes of the annular steering seat (310) whose center lines are collinear, and are fixedly connected to the columnar base (110) of the steering gear (1), and the diameter of each of the second steering seat connecting rods (330) is smaller than the diameter of the through hole of the annular steering seat (310); There is a gap between the annular steering seat (310) and the columnar base (110); The center line of the through hole of the annular steering seat (310) through which the at least two second steering seat connecting rods (330) pass is perpendicular to the center line of the connecting through hole (220) of the reducer housing (2), and the center line of the through hole of the annular steering seat (310) and the center line of the connecting through hole (220) of the reducer housing (2) are both perpendicular to the extension and retraction direction of the screw rod of the steering gear (1).

3. The mechanism according to claim 1, characterized in that: The universal joint (3) further comprises a first shock absorbing sleeve (340), the first shock absorbing sleeve (340) being fixedly sleeved in the connecting through hole (220) of the reducer housing (2), and the diameter of each steering seat connecting rod (320) being smaller than the inner diameter of the first shock absorbing sleeve (340).

4. The mechanism according to claim 2, characterized in that: The first steering seat connecting rod (320) and the second steering seat connecting rod (330) are both bolts; the first steering seat connecting rod (320) is threadedly connected to the annular steering seat (310); and the second steering seat connecting rod (330) is threadedly connected to the columnar base (110) of the steering gear (1).

5. The mechanism according to claim 2 or 4, characterized in that: The universal joint (3) further comprises a second shock-absorbing sleeve (350), the second shock-absorbing sleeve (350) being fixedly sleeved in a through hole of the annular steering seat (310) through which the second steering seat connecting rod (330) passes, the diameter of the second steering seat connecting rod (330) being smaller than the inner diameter of the second shock-absorbing sleeve (350).

6. The mechanism according to claim 1, characterized in that: It also comprises a swash plate (4), and the top end of the screw rod of the steering gear (1) is connected to the swash plate (4) via a rod end bearing.

7. The mechanism according to claim 6, characterized in that It also includes an anti-torsion arm (5), one end of the anti-torsion arm (5) is connected to the swash plate (4), and the other end is connected to the reducer housing (2).

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