Forward and backward pushing switching device for straight-through type accelerator platform and airplane with forward and backward pushing switching device

Abstract

A forward and reverse pushing switching device for a straight-through type accelerator table comprises a trigger, a handle box, a pin, a first sleeve, a second sleeve and an operation table provided with a sliding rail, the trigger is arranged in the handle box in a sliding mode, the handle box is inserted into the operation table, the trigger comprises a trigger body, a hole is formed in the first end of the trigger body, the pin penetrates through the hole, and the first sleeve is inserted into the second sleeve. The pin is arranged on the operating platform and can move on a sliding rail in the operating platform so as to switch forward and reverse pushing strokes and forward and reverse pushing force, and a first sleeve and a second sleeve which are constructed as rolling bearings are arranged at the two ends of the pin in a sleeving manner, so that when the pin slides on the sliding rail, the first sleeve and the second sleeve are in rolling contact with the contact surface of the sliding rail respectively; the contact surfaces of the bearing and the pin are also in rolling contact. According to the forward and reverse pushing switching device, through rolling contact between the first sleeve and the second sleeve which are constructed to be rolling bearings and the sliding rail and between the first sleeve and the second sleeve and the pin, the risk that the trigger is clamped in the switching process from the forward pushing stroke to the reverse pushing stroke is reduced. The utility model further provides an airplane which is provided with the forward and reverse pushing switching device for the straight-through type accelerator platform.

Description

Technical Field

[0001] The utility model relates to the field of aircraft. Specifically, the utility model proposes a forward and reverse thrust switching device for a straight-through throttle platform of an aircraft. In addition, the utility model also proposes an aircraft with the forward and reverse thrust switching device. Background Art

[0002] The throttle control panel is a control device used to control the forward thrust and reverse thrust of the engine on an aircraft. The throttle control panel control assembly is usually installed on the central control panel of the aircraft cockpit, on which a throttle lever is installed, corresponding to a single engine of the aircraft.

[0003] For example, CN 204197302 U (publication date: March 11, 2015) discloses a throttle platform device, which includes at least one forward thrust lever and at least one fuel control switch. In the throttle platform device, relative installation positions of the throttle platform, the reverse thrust lever and the forward thrust lever are set.

[0004] The requirements for the throttle control components are as follows:

[0005] According to the Civil Aviation Regulations CCAR 25.779, the throttle lever should be moved forward to increase the positive thrust, and backward to increase the reverse thrust.

[0006] According to the Civil Aviation Regulations CCAR 25.1155, there must be a positive lock or stop in the flight idle position, and the crew must be required to take other obvious actions to move the control device from the flight state (positive thrust state for turbojet aircraft).

[0007] It is known that there are two main means for switching between forward thrust and reverse thrust in the aircraft throttle platform:

[0008] The first is the piggyback double-lever type, in which the forward thrust and reverse thrust are controlled separately by two joysticks. The two joysticks are structurally locked to each other, and the reverse thrust lever can only move to the reverse thrust stroke when the forward thrust lever moves to a specific position. Although this piggyback double-lever structure has good operating performance, its structure is complex, and the complex structure further leads to a large size and heavy weight of the throttle control console.

[0009] The second type is a straight-through block type, in which a block or a slide rail height difference is provided at the junction of the forward thrust stroke and the reverse thrust stroke of the throttle lever to switch between the forward thrust and the reverse thrust. For example, a device for preventing misoperation of the throttle platform of an aircraft is known from CN 106438059A (publication date: February 22, 2017). The device for preventing misoperation includes an operating table and a joystick, in which a slide rail is provided; the joystick can rotate along the axis; the slide rail includes a front slide rail, a middle slide rail, and a rear slide rail, in which a height difference is formed between the front slide rail and the rear slide rail, thereby providing a height difference of the forward and reverse thrust strokes of the throttle lever slide rail in the device for preventing misoperation and violent breakthrough by means of a recovery spring.

[0010] However, in this straight-through throttle platform structure, due to the operating habits of the operator and the design of the trigger pin and the slide rail, specifically, the relative movement between the trigger pin and the slide rail is sliding friction, and the block has the defect of easy jamming, which easily causes problems such as the reverse thrust trigger jamming, reverse thrust failure to deploy, handle box and guide rail wear. If the reverse thrust fails to deploy as instructed during the landing process of the aircraft, then for some models of aircraft, the failure impact level of losing the single-engine reverse thrust will be relatively large.

[0011] Therefore, the following demand has been perceived in the art, that is, it is necessary to propose a new forward and reverse thrust switching device for a throttle platform, and it is expected that the forward and reverse thrust switching device can overcome at least one of the above-mentioned defects of the prior art, especially can reduce the risk of the reverse thrust trigger of the straight-through throttle platform getting stuck. Utility Model Content

[0012] The utility model is based on the task of providing a forward and reverse thrust switching device, which is used for a straight-through throttle platform and can reduce the risk of the reverse thrust trigger of the straight-through throttle platform being stuck.

[0013] The above-mentioned task is solved by the forward and reverse thrust switching device as follows, that is, the forward and reverse thrust switching device comprises: a trigger, a handle box, a pin, a first sleeve, a second sleeve, and an operating table provided with a slide rail,

[0014] The handle box includes a handle box body, and a gripping portion is provided at one end of the handle box body;

[0015] The trigger is provided with a lifting member, so that the pilot can operate the lifting member to lift the trigger;

[0016] The trigger is slidably arranged in the handle box, specifically received in the handle box body, and the handle box is inserted into a through-through middle portion opened in the operating table.

[0017] The trigger includes a trigger body, and a hole is formed at a first end of the trigger body, through which a pin passes and can move on a slide rail arranged in an operating table to switch between a forward thrust stroke and a reverse thrust stroke, thereby realizing switching between forward thrust and reverse thrust, and

[0018] The two ends of the pin are respectively sleeved with a first sleeve and a second sleeve constructed as rolling bearings. When the pin moves on the slide rail, the first sleeve and the second sleeve respectively roll in contact with the contact surface of the slide rail, and the first sleeve and the second sleeve respectively roll in contact with the pin.

[0019] In the forward and reverse thrust switching device for the straight-through throttle platform according to the utility model, when the pin rolls on the slide rail set in the operating platform, the pin drives the sleeves mounted on both ends of the pin to roll in the slide rail, so that the rolling friction between the pin and the sleeve and the sleeve and the slide rail replaces the sliding friction between the sleeve mounted on the pin and the slide rail in the existing forward and reverse thrust switching device when switching between the forward thrust stroke and the reverse thrust stroke, that is, when pulling from the forward slow car to the reverse thrust stroke. In this way, the risk of excessive force required to lift the trigger due to excessive friction is reduced, and the risk of the pin getting stuck is reduced.

[0020] In this application, "trigger" and "reverse trigger" are used interchangeably unless otherwise specified.

[0021] In the present application, unless otherwise specified, “positive thrust stroke” and “positive thrust stroke” may be used interchangeably, and “reverse thrust stroke” and “reverse thrust stroke” may be used interchangeably.

[0022] In a non-limiting embodiment of the present invention, the handle brake body and the gripping portion are firmly connected to each other through a form-fitting connection, and the gripping portion is for the pilot to grip to perform corresponding operations.

[0023] In a non-limiting embodiment of the present invention, a lifting tab is fixed to the lifting member by, for example, a threaded connection member, so as to facilitate the pilot to manipulate the lifting trigger.

[0024] In a non-limiting embodiment of the present invention, the operating table is configured to have a first side and a second side, which are separated by a through middle portion. The aforementioned slide rail is arranged in a mirror-symmetrical manner on the first side and the second side of the operating table in the form of a through opening. The first sleeve and the second sleeve configured as rolling bearings slide in the through opening on the first side of the operating table and the through opening on the second side of the operating table, respectively.

[0025] Further, the slide rail includes a first slide rail portion, a second slide rail portion and a third slide rail portion. The first slide rail portion corresponds to a forward thrust stroke or a forward thrust stroke. The third slide rail portion corresponds to a reverse thrust stroke or a reverse thrust stroke. The second slide rail portion is connected to the first slide rail portion with a first end of the second slide rail portion, and is connected to the third slide rail portion with a second end of the second slide rail portion, and wherein the first end of the second slide rail portion is arranged to be lower than the second end of the second slide rail portion opposite thereto. Thus, a height difference is constructed in the slide rail for switching between the forward thrust stroke and the reverse thrust stroke, which is the so-called "switching stroke".

[0026] Specifically, a first return spring and a second return spring are also provided in the forward and reverse push switching device according to the utility model, and the first return spring and the second return spring are arranged between the trigger body of the trigger and the body of the handle box, so that when the trigger is lifted upward, the first return spring and the second return spring are compressed.

[0027] In one embodiment of the utility model, the trigger of the forward and reverse push switching device is provided with a first accommodating portion and a second accommodating portion on a first lateral side facing the handle box, respectively used to accommodate a first return spring and a second return spring, and a trigger protrusion protruding in the lateral direction is provided between the first and second accommodating portions and spaced apart from them. The trigger protrusion can be configured in the form of a cam or a part thereof.

[0028] In contrast, the handle box body of the handle box of the forward and reverse thrust switching device is provided with a recessed portion on the second lateral side of the first lateral side facing the trigger, and two handle box protrusions are provided in the recessed portion, which are spaced apart from each other and protrude in the lateral direction. The handle box protrusion can also be configured in the form of a cam or a part thereof.

[0029] Unless otherwise specified herein, the longitudinal direction of the trigger and the handle box refers to the direction in which their lengths lie, and the transverse direction refers to the direction perpendicular to the longitudinal direction.

[0030] The arrangement of the trigger protrusion and the handle box protrusion enables them to compress the first return spring and the second return spring received in the first accommodating portion and the second accommodating portion when the trigger is lifted, thereby generating a restoring force and realizing the reverse push of the trigger relative to the handle box body. After the trigger lifting member is released, due to the height difference limitation between the first slide rail portion, the second slide rail portion and the third slide rail portion of the slide rail, the pin and the trigger will be kept in the lifted position.

[0031] Specifically, in a non-limiting embodiment of the present invention, in the forward and reverse thrust switching device according to the present invention, the first return spring, the second return spring and the trigger are all accommodated in the recessed portion of the handle box body. The two handle box protrusions of the handle box extend into the first accommodation portion and the second accommodation portion, respectively, and the lower surfaces of the handle box protrusions contact the first return spring and the second return spring, respectively. Thus, as the trigger is lifted upward, the handle box remains stationary due to being rotatably connected to other fixings in the cockpit, while the trigger moves upward and thus slides relative to the handle box. During the sliding process, the first handle box protrusion and the second handle box protrusion respectively squeeze the first return spring and the second return spring with their lower surfaces.

[0032] In a preferred embodiment of the utility model, the trigger protrusion has a chamfered portion configured as a circular chamfer, and the handle box protrusion has a chamfered portion configured as a circular chamfer. Compared with the right-angled boss portion used in the forward and reverse thrust switching device in the prior art, the handle box protrusion and the trigger protrusion configured as the chamfered portion can avoid the right-angled bosses between the trigger and the handle box from abutting against each other when the pilot pulls the throttle lever backward and pulls the trigger at the same time, resulting in interference in relative motion, possible stress concentration, and excessive friction caused by stress concentration.

[0033] In a preferred embodiment of the utility model, in the forward and reverse thrust switching device, there is an assembly gap between the trigger protrusion and the handle box protrusion. Thus, when the trigger is not lifted, the trigger protrusion and the handle box protrusion will not abut each other.

[0034] Therefore, the forward-reverse thrust switching device according to the utility model can effectively solve the following problems existing in the prior art mentioned at the beginning of this article, namely, when the throttle lever handle enters the reverse thrust stroke from the forward thrust position backward, the friction between the trigger and the handle box is too large, and it is difficult to lift the reverse thrust trigger due to excessive friction.

[0035] The utility model also provides an aircraft, which has a straight-through throttle platform and a forward and reverse thrust switching device for the straight-through throttle platform according to any of the above technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above-mentioned features and other features and technical advantages of the present invention will be explained below with reference to the embodiments shown in the accompanying drawings, which are intended to be understood as illustrative rather than limiting.

[0037] Figure 1 An exploded perspective view of a forward and reverse thrust switching device for a straight-through throttle platform according to an embodiment of the utility model is shown;

[0038] Figure 2 Show Figure 1 A cross-sectional view of the forward and reverse thrust switching device shown;

[0039] Figure 3 An exemplary cross-sectional view of a sleeve in a forward and reverse thrust switching device according to the present utility model is shown;

[0040] Figure 4 A schematic diagram showing the switching between the forward thrust stroke and the reverse thrust stroke of the forward and reverse thrust switching device according to the utility model is shown in a cross-sectional view;

[0041] Figure 5 A schematic diagram showing a forward and reverse thrust switching device in the prior art and a trigger lifting process of the forward and reverse thrust switching device according to the utility model in a cross-sectional view;

[0042] Figure 6 A cross-sectional view schematically illustrates the compression process of the return spring of the forward and reverse push switching device according to the present invention when the trigger is lifted; and

[0043] Figure 7 The cross-sectional view schematically shows the assembly clearance determined in one embodiment of the forward and reverse thrust switching device according to the utility model.

[0044] List of reference numerals:

[0045] 11 Trigger body

[0046] 11' (Prior Art) Trigger Body

[0047] 111 (first) accommodation portion

[0048] 111' (First of the Prior Art) Accommodation Section

[0049] 112 (second) accommodation portion

[0050] 112' (Second Accommodation Section of Prior Art)

[0051] 12 Lifting parts

[0052] 121 Lifting tab

[0053] 20 Handle Box

[0054] 20' (Prior Art) Handle Box

[0055] 201 handle box body

[0056] 202 Grip

[0057] 203 Rotating unit

[0058] 30 Operation table

[0059] 31 Slide rail

[0060] 311 First slide rail

[0061] 312 Second slide rail

[0062] 313 Third slide rail

[0063] 40 Pins

[0064] 51 (first) return spring

[0065] 52 (Second) Return Spring

[0066] 100 Forward and reverse thrust switching device

[0067] 100' Prior art forward and reverse switching push-pull device

[0068] B Center

[0069] C Corner

[0070] CA1 Trigger protrusion

[0071] CA1' (Prior Art) Trigger Protrusion

[0072] CA2 handle box protrusion

[0073] CA2' (prior art) handle box protrusion

[0074] C1 (trigger protrusion) first side

[0075] C1' (first side of the trigger protrusion of the prior art)

[0076] C2' (second side of the trigger protrusion of the prior art)

[0077] C3 (the third side of the handle box protrusion)

[0078] C3' (the third side of the handle box protrusion of the prior art)

[0079] G1 (upper) clearance

[0080] h hole

[0081] L1 Lower edge

[0082] LL reference line

[0083] M Assembly clearance

[0084] R1 (Chamfered part of the handle box protrusion)

[0085] S1 (first) sleeve

[0086] S2 (second) sleeve. DETAILED DESCRIPTION

[0087] Although the utility model will be described in conjunction with the exemplary embodiments, it will be understood by those skilled in the art that this specification is not intended to limit the utility model to the described exemplary embodiments. On the contrary, the utility model is intended to cover not only the exemplary embodiments, but also various options, modifications, equivalents, etc. that may be included in the spirit and scope of the utility model defined by the appended claims.

[0088] For ease of interpretation and precise definition in the appended claims, unless otherwise stated, the terms "upper," "lower," "inner," and "outer" are used to describe various features with reference to their positions in the exemplary embodiments shown in the figures.

[0089] Refer to the following Figures 1 to 7 A thrust-reverse switching device for a straight-through throttle station, generally designated by reference numeral 100 , is described.

[0090] First reference Figure 1 The forward and reverse push switching device 100 includes a trigger, a lifting member 12, a handle box 20, an operating table 30, sleeves S1, S2, a pin 40 and two return springs 51, 52. The trigger is also called a reverse push trigger, and includes a trigger body 11.

[0091] In the trigger of the forward and reverse thrust switching device 100, the lifting member 12 is connected to the trigger body 11 through a threaded fastener, such as a bolt. The lifting member 12 is provided with a lifting tab 121 extending in a transverse direction, that is, orthogonal to the length direction or longitudinal direction of the lifting member 12. In use, the pilot lifts the lifting member 12 by acting on the lifting tab 121, thereby driving the trigger body 11 threadedly connected to the lifting member 12 to lift.

[0092] The trigger body 11 is provided with a first accommodating portion 111 and a second accommodating portion 112 spaced apart from each other along the length direction on the inner side. The first accommodating portion 111 and the second accommodating portion 112 are provided in the form of grooves. The return springs 51 and 52 can be placed in the first accommodating portion 111 and the second accommodating portion 112, respectively.

[0093] In addition, if Figure 1 As can be seen in the figure, a trigger protrusion CA1 is further provided between the first accommodation portion 111 and the second accommodation portion 112 of the trigger body 11 along the longitudinal direction, which will be referred to below. Figures 4 to 6 The function of the trigger protrusion CA1 is explained in more detail.

[0094] The handle box 20 includes a handle box body 201. A gripping portion 202 and a rotating portion 203 for pilot operation are respectively provided at both ends of the handle box body 201. A central hole is provided in the rotating portion 203 for a rotating shaft provided as a fixing member to pass through (not shown), so that the handle box 20 is rotatable but not translatable relative to the control console. The gripping portion 202 is configured as a spherical shape for the pilot to grip and perform corresponding operations. The gripping portion 202 can be connected to the handle box body 201 by plugging. For example, the axial protrusion provided at the first end of the handle box body 201 is inserted into the recessed portion provided in the gripping portion 202, thereby realizing the shape-matched connection between the handle box body 201 and the gripping portion 202.

[0095] Combination Figure 2 It can be noted from the cross-sectional view shown that inside the handle box body 201 ( Figure 1 Two handle box protrusions CA2 are also provided (not visible in FIG. 2 ).

[0096] During operation, as the pilot pulls the trigger body 11 through the pulling member 12 , the two handle box protrusions CA2 will contact and abut against the return springs 51 , 52 , respectively, thereby squeezing them.

[0097] A hole h is formed at the lower end of the trigger body 11 , ie, at the end farther from the lifting member 12 .

[0098] In the forward and reverse thrust switching device 100 , the trigger body 11 is arranged in the handle box 20 and can slide relative to the handle box body 201 of the handle box 20 . The lower end of the handle box 20 containing the trigger body 11 is inserted and passed through the middle through portion of the operating platform 30 .

[0099] Here, the pin 40 passes through the hole h opened at the lower end of the trigger body 11, and its two sides extend out of the two sides of the handle box 20 respectively. Gaskets and sleeves S1 and sleeves S2 are respectively sleeved on the two ends of the pin 40. The pin 40 moves in the slide rail 31, thereby realizing the switching between the forward thrust stroke and the reverse thrust stroke. Specifically. The first sleeve S1 and the second sleeve S2 sleeved on the two ends of the pin 40 slide in the slide rails 31 set in the operating table 30, specifically, in the slide rails 31 set on both sides of the operating table 30.

[0100] like Figure 1As can be seen in the figure, the slide rail 31 includes three parts: a first slide rail portion 311, a second slide rail portion 312 and a third slide rail portion 313, wherein the second slide rail portion 312 connects the first slide rail portion 311 and the third slide rail portion 313. The first slide rail portion 311 extends about 90° in the circumferential direction, and then a change in curvature and a change in height occur at the second slide rail portion 312, so that the second slide rail portion 312 extends upward compared to the first slide rail portion 311, that is, extends outward in the radial direction, and then a change in curvature occurs again to transition to the third slide rail portion 313. The third slide rail portion 313 extends about 30° in the circumferential direction again.

[0101] In the forward and reverse thrust switching device 100, the first sleeve S1 and the second sleeve S2 are constructed as rolling bearing sleeves. Figure 3 , the rolling bearing-like construction of the first sleeve S1 is shown in a cross-sectional view as an example.

[0102] In the illustrated embodiment, by adopting sleeves S1 and S2 constructed as bearing-type sleeves, when sliding along the slide rail 31 to perform a full stroke, for example from positive thrust to reverse thrust, what specifically occurs between the slide rail 31 and the pin 40 is rolling contact along the contact surface of the slide rail 31.

[0103] In other words, by using sleeves S1 and S2 that are configured as ball bearings and have balls inside, the sliding friction between the pin 40 or the sleeve (if any) sleeved outside the pin 40 and the slide rail 31 can be converted into rolling friction, thereby reducing the sticking of the pin 40 due to excessive friction, and further avoiding the defect of requiring excessive force to lift the reverse trigger due to the sticking of the pin 40.

[0104] Furthermore, by adopting the first sleeve S1 and the second sleeve S2 which are structured as bearings, specifically rolling bearings, when the pilot pulls the lifting member 12 of the trigger to switch from the forward slow-speed pull to the reverse thrust stroke, the pin 40 can drive the sleeves S1 and S2 which are structured as rolling bearings to roll in the slide rail 31 provided on the operating table 30, and the pin 40 rolls with the sleeves S1 and S2, and the sleeves S1 and S2 roll with the slide rails. Therefore, in this process, the lifting force required for the lifting member 12 of the lifting trigger is reduced, thereby reducing the sticking of the reverse thrust trigger of the straight-through throttle platform, and further significantly reducing the sticking of the stroke switching from forward thrust to reverse thrust.

[0105] According to calculations and verifications, for the forward and reverse thrust switching device 100 according to an embodiment, the lifting force required to lift the trigger does not increase with the increase of the backward force. For example, taking a 6-pound backward pulling force on the trigger as an example, only 5.51 pounds of trigger lifting force is required to unlock and enter the reverse thrust stroke, which is equivalent to the force of only lifting the trigger upward when the throttle lever is stationary.

[0106] Next reference Figure 4 , which shows the following states in more detail with three views (a), (b) and (c): the trigger is not lifted and is in the forward push stroke; the trigger is lifted and enters the reverse push stroke; the trigger is maintained in the reverse push stroke.

[0107] Specifically, in Figure 4 In part (a), the pin 40 is at the end of the first slide rail portion 311 of the slide rail 31. At this time, the trigger has not been lifted by the lifting member 12 and is still in the positive thrust stroke.

[0108] Afterwards, as the pilot pulls the trigger upward, the pin 40 in the hole h of the trigger body 11 is driven to move upward and enters the second slide rail portion 312 that turns upward due to the change in curvature, and thus begins to enter the reverse thrust stroke.

[0109] Furthermore, after reaching the highest point of the second slide rail portion 312, the pilot does not need to continue to pull the lifting member 12, and the trigger body 11 will maintain the high position circular motion, thereby driving the pin 40 disposed in the hole h to roll in the circumferential direction along the direction of the third slide rail portion 313. At this time, the reverse thrust stroke is entered.

[0110] In other words, in the slide rail 31, the first slide rail portion 311 which has a longer circumferential length and enables the pin 40 to move upward as a whole corresponds to the positive thrust stroke, while the third slide rail portion 313 which has a shorter circumferential length, is shorter than the first slide rail portion 311 and enables the pin 40 to maintain upward circular motion as a whole corresponds to the reverse thrust stroke, and the second slide rail portion 312 connecting the first slide rail portion 311 and the third slide rail portion 313 forms a slide rail height difference, so that when the pilot performs the reverse thrust stroke operation, he needs to first lift the reverse thrust trigger on the thrust rod, so that the pin 40 connected to the trigger body 11 and the sleeves S1 and S2 mounted thereon pass over the mechanical stop surface and enter the reverse thrust stroke of the slide rail 31.

[0111] In the above-mentioned switching process from the forward thrust stroke to the reverse thrust stroke from the first slide rail portion 311 to the second slide rail portion 312 to the third slide rail portion 313, what contacts the contact surface of the slide rail portion in each slide rail portion 311, 312, 313 is actually the first sleeve S1 and the second sleeve S2 sleeved on both ends of the pin 40, and specifically, rolling contact occurs between them.

[0112] Reference is located at Figure 4 The uppermost reference line LL also shows the height change of the lifting member 12 , especially the lifting tab 121 , during the switching process from the forward thrust stroke to the reverse thrust stroke. This can also reflect the lifting operation performed by the pilot on the trigger body 11 through the lifting member 12 .

[0113] Compared with the forward and reverse thrust switching device of the prior art, in which sliding friction occurs between the contact surface of the pin and the slide rail or between the sleeve sleeved outside the pin and the contact surface of the slide rail, in the forward and reverse thrust switching device 100, rolling friction occurs between the contact surface of the rolling bearing sleeves S1, S2 sleeved outside the pin 40 and the slide rail 31. The wear caused by rolling friction is reduced compared to the wear caused by sliding friction. This can extend the service life of the forward and reverse thrust switching device 100 on the one hand, and improve the safety of the use of the forward and reverse thrust switching device 100 on the other hand, reduce the risk of the reverse thrust trigger getting stuck, and improve the smoothness of the use of the forward and reverse thrust switching device 100. The friction resistance encountered by the pin 40 during the movement on the slide rail 31 can be reduced by more than 50%.

[0114] Go to Figure 5 The trigger body 11 and the handle box 20 provided in the forward and reverse thrust switching device 100 will be explained in detail. Specifically, the interaction between the trigger protrusion CA1 provided on the trigger body 11 and the handle box 20 provided on the handle box 20 will be explained with reference to the cross-sectional view of the trigger body 11 and the handle box 20 connected together.

[0115] First reference Figure 5 Part (d) shows a cross-sectional view of a trigger body 11 ′ and a handle box 20 ′ of a forward and reverse thrust switching device 100 ′ in the prior art.

[0116] As from Figure 5 As can be seen in part (d) of FIG. 1 , and in particular in the enlarged view shown on the lower right side of part (d), the trigger body 11' of the forward and reverse thrust switching device 100' of the prior art is provided with a first accommodating portion 111' and a second accommodating portion 112' on its first lateral side. The first accommodating portion 111' and the second accommodating portion 112' are used to receive the first return spring 51 and the second return spring 52, respectively. A trigger protrusion CA1' is provided between the first accommodating portion 111' and the second accommodating portion 112'.

[0117] In the forward and reverse push switching device 100', the trigger body 11' is also slidably received in the handle box 20'. The handle box 20' is provided with a recessed portion on its second lateral side opposite to the first lateral side of the trigger body 11'. Two handle box protrusions CA2' protruding in the lateral direction are provided in the recessed portion, and the trigger body 11' and the first return spring 51 and the second return spring 52 are accommodated in the recessed portion, so that the return springs 51 and 52 are accommodated between the trigger body 11 and the handle box body 201 of the handle box 20. The handle box 20' is also provided with a cover (not shown) on the lateral side to close the recessed portion.

[0118] As in Figure 5 As can be seen in the detailed view shown in the lower right corner of part (d), in the forward and reverse push switching device 100', when the trigger body 11' is not lifted, the two right angles of the trigger protrusion CA1' and the handle box protrusion CA2' abut against each other. Specifically, the first side C1' of the right angle of the trigger protrusion CA1' abuts against the second side CA2' of the right angle of the handle box protrusion CA2'. In addition, as can be seen in the figure, the other corner of the handle box protrusion CA2' is also configured as a right angle and has a third side C3'. The third side C3' of each handle box protrusion CA2' is used to squeeze the return springs 51 and 52 when contacting them, providing a lifting force for lifting the trigger.

[0119] In the prior art forward / reverse thrust switching device 100', the trigger protrusion CA1' of the trigger body 11' and the handle box protrusion CA2' of the handle box 20' are abutted at right angles. When the pilot pulls the throttle lever backward through the grip of the handle box 20' and pulls the trigger at the same time, it is possible that the right-angled protrusions CA1' and CA2' of the trigger body 11' and the handle box 20' may abut against each other and move relative to each other, causing interference.

[0120] exist Figure 5 Parts (e) and (f) show cross-sectional views of the handle box 20 in the forward-reverse thrust switching device 100 and the trigger body 11 accommodated in the handle box body 201 thereof, wherein part (e) shows the state when the trigger body 11 has not been lifted, and the lower right corner of part (e) shows in detail the details circled in part (e), while part (f) shows the state when the trigger body 11 is lifted.

[0121] like Figure 5 As can be seen in parts (e) and (f) of the drawing, the trigger body 11 is provided with a first accommodating portion 111 and a second accommodating portion 112 on a first lateral side thereof. The first accommodating portion 111 and the second accommodating portion 112 are used to receive the first return spring 51 and the second return spring 52, respectively. As explained above, a trigger protrusion CA1 protruding in the lateral direction is provided between the first accommodating portion 111 and the second accommodating portion 112.

[0122] The handle box body 201 of the handle box 20 of the forward and reverse thrust switching device 100 is provided with a recessed portion on the second lateral side facing the first lateral side of the trigger body 11. Two handle box protrusions CA2 protruding in the lateral direction are provided in the recessed portion. The trigger body 11 and the two return springs 51, 52 are both accommodated in the recessed portion.

[0123] As in Figure 5As can be seen in the detailed view shown in the lower right corner of part (e), in the forward and reverse thrust switching device 100, the trigger protrusion CA1 is different from the above-mentioned trigger protrusion CA1', and is provided with a chamfered portion R2 in the shape of an arc in the figure. The chamfered portion R2 has a first side C1. In the handle box protrusion CA2 opposite to the trigger protrusion CA1, unlike the handle box protrusion CA2' in the above-mentioned prior art, the handle box protrusion CA2 is no longer provided with two right-angled portions, but also has a chamfered portion R1 constructed in an arc shape, and the chamfered portion R1 also has a third side or called the lower side C3.

[0124] When the trigger body 11 is not lifted, see Figure 5 In the portion (e), the chamfered portion R2 of the trigger protrusion CA1 does not contact the chamfered portion R1 of the handle case protrusion CA2, and as can be seen in the figure, the chamfered portion R1 of the handle case protrusion CA2 is different from the chamfered portion R2 of the trigger protrusion CA1. Specifically, the chamfered portion R1 of the handle case protrusion CA2 is constructed like a tooth of a gear, with a relatively complete circular arc similar to the tooth top surface, while the chamfered portion R2 of the trigger protrusion CA1 is constructed as only a part of the circular arc having the tooth top surface in the illustrated embodiment.

[0125] When the pilot pulls the throttle lever backward and pulls the trigger body 11 through the lifting member 12 at the same time, Figure 5 As can be seen in part (f), in the forward and reverse thrust switching device 100, the first side C1 of the chamfered portion R2 of the trigger protrusion CA1 and the arc surface of the chamfered portion R1 of the handle box protrusion are no longer prone to interference caused by relative movement, and thus will not affect the switching between the forward thrust and the reverse thrust. At the same time, the arrangement of the chamfered portions R1 and R2 also avoids the stress concentration that may be caused by the right angles of the trigger protrusion CA1' and the handle box protrusion CA2' in the prior art abutting against each other and thus interfering with each other, and the excessive friction that is generated. This avoids scratching and effectively reduces the resistance of the trigger body 11 when the entire body moves.

[0126] At the same time, the third sides C3 of the two handle box protrusions CA2 of the handle box 20 are still used to compress the return springs 51 and 52 accordingly when contacting them, so as to provide a lifting force for lifting the trigger.

[0127] Next reference Figure 6 Parts (g) and (h) specifically show the squeezing of the return springs 51 and 52 by the trigger protrusion CA1 and the handle box protrusion CA2.

[0128] Specifically, Figure 6 Part (g) shows that when the trigger is not lifted, the return springs 51 and 52 are not compressed. Figure 6Part (h) shows that when the trigger is lifted, specifically, when the trigger is lifted 50%, the return springs 51 and 52 are compressed by the trigger protrusion CA1 and the handle box protrusion CA2, thereby generating a return force.

[0129] like Figure 6 As shown in part (g) of the figure, the first return spring 51 is received in the first accommodation portion 111 of the trigger body 11, and the second return spring 52 is received in the second accommodation portion 112 of the trigger body 11. At this time, the trigger body 11 is not lifted, and the return springs 51 and 52 are received in the accommodation portions 111 and 112 in an uncompressed state.

[0130] As can be seen from this portion, at this time, there is a gap G1 between the upper edge of the trigger body 11 and the upper edge of the recessed portion formed on the second lateral side of the interior of the handle box 20 opposite to the trigger body 11 .

[0131] At this time, if the pilot pulls the trigger body 11 through the lifting member 12, the trigger body 11 moves upward in the axial direction relative to the handle box 20, thereby squeezing the return springs 51 and 52, generating a restoring force to lift the trigger, and the upper side of the chamfered portion R2 of the trigger protrusion CA1 relative to the lower side of the chamfered portion R1 of the handle box protrusion CA2, that is, the third side R3, is relatively rotated. Such relative rotation avoids the scraping interference that may occur when the two protrusions configured as right-angled portions abut against each other in the above-mentioned prior art forward and reverse thrust switching device 100'. In addition, in the forward and reverse thrust switching device 100, the contact area between the chamfered portion R2 of the trigger protrusion CA1 and the chamfered portion R1 of the handle box protrusion CA2 will also be smaller.

[0132] As from Figure 6 As can be seen in part (h) of FIG. 1 , as the trigger is pulled upward, the gap G1 is gradually compressed. When the trigger is lifted 50%, the gap G1 is compressed compared to Figure 6 The (g) portion also becomes 50% thereof.

[0133] At this time, the first restoring spring 51 is squeezed by the chamfered portion R2 of the trigger protrusion CA1 and the chamfered portion R1 of the handle box protrusion CA2, thereby being deformed and providing a restoring force.

[0134] Similar to the first return spring 51 , the second return spring 52 is squeezed by the third side C3 of the chamfered portion R2 of the trigger protrusion CA1 and the lower edge L1 of the second accommodating portion 112 , generating substantially the same deformation as the first return spring 51 , and thereby providing a return force.

[0135] If also from Figure 6It can be noted in part (h) that as the trigger body 11 is lifted, the distance between the lower edge of the trigger body 11 and the lower edge of the above-mentioned recessed portion on the second lateral side of the handle box 20 gradually increases.

[0136] Final Reference Figure 7 , which schematically illustrates the determination of the assembly gap M in the forward and reverse thrust switching device 100.

[0137] like Figure 7 As shown, in the forward and reverse thrust switching device 100, there is an assembly gap M between the upper edge of the first accommodating portion 111 of the trigger body 11 and the handle box protrusion CA2 of the handle box 20. The assembly gap M is, for example, 2 mm. The distance L between the corner point C of the upper edge of the first accommodating portion 111 of the trigger body 11 and the center B of the through hole h provided at the lower end of the trigger body 11 is BC When the distance L is 210 mm, the recommended radius r of the chamfered portions R2 and R1 of the trigger protrusion CA1 and the handle box protrusion CA2 can be calculated according to the following formula, and wherein, the distance L BC It also corresponds to the force arm from the corner point of the first accommodating portion 111 of the trigger body 11 of the forward and reverse thrust switching device 100 to the rotation center of the trigger body 11:

[0138]

[0139] Therefore, the forward and reverse thrust switching device according to the utility model is optimized in terms of the mechanical mechanism of the engine throttle reverse thrust.

[0140] The forward and reverse thrust switching device according to the utility model can be modified to be applicable to the setting of the forward and reverse thrust switching devices of engines of multiple models.

[0141] The forward and reverse thrust switching device according to the utility model can reduce the situation in which the reverse thrust cannot be deployed as instructed due to the jamming of the reverse thrust trigger during the landing of the aircraft, and reduce the false alarm failures related thereto, thereby further avoiding the loss of single-engine reverse thrust and other events that affect safe flight.

[0142] The present invention can freely combine various embodiments within its scope, or appropriately modify or omit various embodiments.

Claims

1. A forward and reverse thrust switching device (100) for a straight-through throttle platform, characterized in that include: A trigger, a handle box (20), a pin (40), a first sleeve (S1), a second sleeve (S2), and an operating table (30) provided with a slide rail (31). The handle box (20) comprises a handle box body (201), and a gripping portion (202) is provided at one end of the handle box body (201). Wherein, the trigger is provided with a lifting member (12). The trigger is slidably disposed in a handle box body (201) of the handle box (20), and the handle box (20) is inserted into the operating table (30). The trigger comprises a trigger body (11), a hole (h) is formed at a first end of the trigger body (11), the pin (40) passes through the hole (h), and can move on a slide rail (31) provided in the operating table (30) to switch between a forward thrust stroke and a reverse thrust stroke, thereby realizing the switching between forward thrust and reverse thrust, and Wherein, the two ends of the pin (40) are respectively sleeved with a first sleeve (S1) and a second sleeve (S2) constructed as rolling bearings, so that when the pin (40) slides on the slide rail (31), the first sleeve (S1) and the second sleeve (S2) respectively roll in contact with the contact surface of the slide rail (31), and the pin (40) rolls in contact with the first sleeve (S1) and the second sleeve (S2).

2. The forward and reverse thrust switching device (100) according to claim 1, characterized in that: The slide rail (31) includes a first slide rail portion (311), a second slide rail portion (312) and a third slide rail portion (313), wherein the second slide rail portion (312) is connected to the first slide rail portion (311) with a first end of the second slide rail portion, and is connected to the third slide rail portion (313) with a second end of the second slide rail portion, and wherein the first end of the second slide rail portion is arranged to be lower than the second end of the second slide rail portion opposite thereto.

3. The forward and reverse thrust switching device (100) according to claim 2, characterized in that It also includes a first return spring (51) and a second return spring (52), wherein the first return spring (51) and the second return spring (52) are arranged between the trigger body (11) of the trigger and the handle box body (201) of the handle box (20), so that when the trigger is lifted upward, the first return spring (51) and the second return spring (52) are compressed.

4. The forward and reverse thrust switching device (100) according to claim 3, characterized in that: The trigger body (11) is provided with a first accommodating portion (111) and a second accommodating portion (112) on a first lateral side facing the handle box (20), respectively used to accommodate the first return spring (51) and the second return spring (52), and a trigger protrusion (CA1) protruding in a lateral direction is provided in the trigger body (11) between the first accommodating portion (111) and the second accommodating portion (112) and spaced apart from the first accommodating portion (111) and the second accommodating portion (112).

5. The forward and reverse thrust switching device (100) according to claim 4, characterized in that: The trigger projection (CA1) has a chamfered portion (R2) configured as a rounded chamfer.

6. The forward and reverse thrust switching device (100) according to claim 5, characterized in that: The handle box body (201) of the handle box (20) is provided with a recessed portion on its second lateral side facing the trigger, and two handle box protrusions (CA2) are provided in the recessed portion and are spaced apart from each other and protrude in the lateral direction. The trigger and the first return spring (51) and the second return spring (52) are accommodated in the recessed portion.

7. The forward and reverse thrust switching device (100) according to claim 6, characterized in that: The two handle box protrusions (CA2) respectively extend into the first accommodating portion (111) and the second accommodating portion (112) of the trigger body (11), and the lower surfaces of the two handle box protrusions (CA2) respectively contact the first return spring (51) and the second return spring (52).

8. The forward and reverse thrust switching device (100) according to claim 7, characterized in that: The handle box protrusion (CA2) has a chamfered portion (R1) configured as a rounded chamfer.

9. The forward and reverse thrust switching device (100) according to claim 8, characterized in that: There is an assembly gap (M) between the trigger protrusion (CA1) and the handle box protrusion (CA2).

10. An aircraft having a through-throttle platform, characterized in that A forward-reverse thrust switching device (100) according to any one of claims 1 to 9 is provided for the straight-through throttle platform.

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