A rudder anti-high overload protection structure, an electric rudder and a potting method

Abstract

The application relates to a rudder anti-high-overload protection structure, an electric rudder and a pouring sealing method, and belongs to the technical field of electric rudders. The application solves the problem that the good anti-high-overload protection capability of an existing electric rudder cannot be combined with miniaturization and light weight. The rudder anti-high-overload protection structure comprises a pouring sealing layer; the pouring sealing layer is in a cylindrical shape, a plurality of strength reinforcing pieces are arranged in the pouring sealing layer, and the strength reinforcing pieces are dispersedly arranged; and the pouring sealing layer further comprises a hole for accommodating a motor. The application realizes the miniaturization and light weight of the electric rudder, and the electric rudder has good anti-high-overload protection capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric rudder, in particular to a rudder anti-high overload protection structure, an electric rudder and a potting method. BACKGROUND

[0002] The electric rudder is generally composed of a motor, a controller, a driver, a speed reduction transmission mechanism and a rudder surface locking and unfolding mechanism. The parameters of the motor determine the deflection speed and frequency of the rudder surface, which is crucial to the performance of the rudder. Moreover, a typical development trend of the electric rudder is to realize lightweight and miniaturization while ensuring high performance and high reliability, and the anti-high overload is an important indicator directly measuring the performance and reliability of the rudder.

[0003] The cannonball is launched by using gunpowder, and the gunpowder releases energy when launched. The motor bears excessive impact load, and the axial overload is as high as 10,000 g, and the radial overload reaches 4,000 g. Such a harsh environment is extremely easy to cause damage to the internal precision components of the motor, such as the falling of the circuit board solder joints and the deformation caused by insufficient shell strength, which will have a serious impact on the performance of the motor, thereby causing the performance failure of the rudder. Therefore, the anti-high overload protection structure design is carried out for the motor of the electric rudder.

[0004] At present, the anti-high overload protection structure design for the motor outside mainly has the following ways:

[0005] I. After the motor is assembled with other components, the whole rudder is potted

[0006] This method requires that there is no movement mechanism inside the rudder, for example, the rudder surface does not have a folding and unfolding process, and does not occupy the internal space of the rudder

[0007] II. Potting the motor alone

[0008] This method only has potting material outside the motor. Since the commonly used potting materials, such as epoxy resin, silicone rubber and polyurethane rubber, are all polymer materials, their elastic modulus is relatively low, and their resistance to elastic deformation is low. Therefore, the effect of using only the potting material as the anti-high overload protection structure of the motor is not ideal.

[0009] III. Establishing a metal protective shell outside the motor, and then potting inside the shell

[0010] This method needs to add a metal outer box outside the motor, which occupies the internal space of the rudder. This is not conducive to the current trend of miniaturization of the rudder, and the metal structure also has a certain weight, which is also not conducive to the development of lightweight. SUMMARY

[0011] In view of the above analysis, the present application aims to provide a rudder anti-high overload protection structure, an electric rudder and a potting method to solve the problem that the good anti-high overload protection capability of the existing electric rudder cannot be compatible with miniaturization and light weight.

[0012] The purpose of the present application is mainly achieved by the following technical solutions:

[0013] In one aspect, the present application provides a rudder anti-high overload protection structure, comprising a potting layer; the potting layer is in a cylindrical shape, and a plurality of strength enhancers are arranged in the potting layer; the strength enhancers are arranged dispersedly; and the potting layer further comprises a hole for accommodating a motor.

[0014] Optionally, a through hole is arranged on the strength enhancer.

[0015] Optionally, the strength enhancer is made of metal, and the hardness of the strength enhancer is lower than that of a connecting piece connecting the motor and a motor mounting plate.

[0016] Optionally, the metal comprises an aluminum alloy.

[0017] In another aspect, the present application further provides an electric rudder with anti-high overload capability, comprising a motor, the above-mentioned rudder anti-high overload protection structure, a motor mounting plate, a rudder frame and a connecting piece; the potting layer is arranged on the outside of the motor, the motor and the motor mounting plate, and the motor mounting plate and the rudder frame are connected through the connecting piece; and the connecting piece passes through the through hole on the strength enhancer.

[0018] Optionally, the position of the strength enhancer corresponds to the position of the interface between the motor and the motor mounting plate.

[0019] Optionally, the position of the strength enhancer corresponds to the position of the interface between the rudder frame and the motor mounting plate.

[0020] Optionally, the connecting piece is a screw, and a lock washer is further arranged between the head of the screw and the upper surface of the strength enhancer.

[0021] Optionally, the lock washer is a spring washer.

[0022] Optionally, the height of the strength enhancer is greater than half of the height of the potting layer and less than the height of the potting layer.

[0023] Optionally, the electric rudder further comprises a lock indication piece, a central hole is arranged on the connecting piece, and at least a part of the lock indication piece is arranged in the central hole.

[0024] Optionally, the outer wall of the lock indication piece is provided with a scale.

[0025] Optionally, the upper surface of the potting layer is lower than the upper surface of the motor.

[0026] In addition, the application also provides a potting method of the electric rudder, which is used for forming the potting layer and comprises the following steps:

[0027] Step 1: installing a potting tool;

[0028] Step 2: preparing potting glue;

[0029] Step 3: pouring the prepared potting glue into the cavity of the potting tool;

[0030] Step 4: demolding.

[0031] Compared with the prior art, the application can achieve at least one of the following beneficial effects:

[0032] (1) The application enhances the high overload resistance of the potting layer by arranging the strength enhancer in the potting layer, thereby improving the impact resistance of the motor, avoiding the relative displacement of the internal elements and connecting wires of the motor under the high overload, and improving the high overload resistance of the rudder.

[0033] (2) The application selects the material of the strength enhancer as an aluminum alloy material with small density (the density is 2.8 g / cm 3 ), and selects the potting material as an epoxy resin with small density (the density is 1.2 g / cm 3 ), thereby meeting the quality requirements of the electric rudder, obtaining greater quality space for the design of other components, and achieving miniaturization and light weight.

[0034] (3) The application controls the height of the strength enhancer to be a specific height (greater than half of the height of the potting layer and less than the height of the potting layer), thereby ensuring that the rudder has good high overload resistance and meeting the space design requirements without affecting other structures.

[0035] (4) The application arranges a through hole on the strength enhancer, so that the connecting piece can pass through the through hole to connect the motor and the motor mounting plate and the motor mounting plate and the rudder frame, thereby preventing the volume of the motor from being increased due to the arrangement of the strength enhancer, and achieving the good high overload protection capability of the electric rudder and the combination of miniaturization and light weight.

[0036] (5) The application applies silicone rubber around the mounting hole of the motor and the mounting hole of the motor mounting plate, thereby preventing the potting glue from flowing into the mounting hole of the motor and the mounting hole of the motor mounting plate, avoiding the potting of the stud, and preventing the removal of the stud.

[0037] (6) The potting method of the application is not to pot the rudder whole after the motor and other components are assembled, nor to pot the motor alone, but to pot the motor and the motor mounting plate as a whole, and to add strength enhancer during the potting process, which improves the high overload resistance of the motor, and takes into account miniaturization and light weight.

[0038] The above technical solutions can be combined with each other in the application to achieve more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description, or will be understood by implementing the application. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

[0040] Figure 1 FIG. 1 is a schematic view of a motor high overload protection structure according to an embodiment of the application;

[0041] Figure 2 FIG. 2 is a top view of the motor high overload protection structure according to the embodiment of the application; Figure 1

[0042] Figure 3 FIG. 3 is a schematic view of an electric rudder without potting according to an embodiment of the application;

[0043] Figure 4 FIG. 4 is an A-A view of the electric rudder without potting according to the embodiment of the application; Figure 3

[0044] Figure 5 FIG. 5 is a schematic view of the electric rudder after potting according to an embodiment of the application;

[0045] Figure 6 FIG. 6 is a B-B view of the electric rudder after potting according to the embodiment of the application. Figure 5

[0046] Reference signs:

[0047] 1-motor, 2-potting layer, 3-connector, 4-anti-loosening piece, 5-strength enhancer, 6-motor mounting plate, 7-stud, 8-potting baffle, 9-potting bottom plate, 10-screw. DETAILED DESCRIPTION

[0048] The preferred embodiments of the application will be described in detail below with reference to the accompanying drawings, which form a part of this application. The accompanying drawings together with the description are used to explain the principles of the application, and are not intended to limit the scope of the application.

[0049] Embodiment one

[0050] ​​​One specific embodiment of the present application discloses a rudder anti-high overload protection structure, as shown in Figure 1 and Figure 2 The rudder anti-high overload protection structure comprises a potting layer 2, which is in a cylindrical shape and has a plurality of strength reinforcing members 5 arranged therein.

[0051] The strength reinforcing members 5 are arranged in the potting layer 2 in a dispersed manner, which can disperse the radial impact force.

[0052] The strength reinforcing members 5 are not arranged separately from the potting layer 2 but form an integral whole, which can resist the radial impact of the motor 1.

[0053] The strength reinforcing members 5 are made of metal, and the hardness of the strength reinforcing members 5 is lower than the hardness of the connecting member 3 connecting the motor 1 and the motor mounting plate 6 and the hardness of the connecting member 3 connecting the rudder frame and the motor mounting plate 6. In this embodiment, the hardness of the strength reinforcing members 5 is limited to be lower than the hardness of the connecting member 3, so that there is a certain compression space during the tightening of the threads, which plays a certain buffering role and better reduces the impact load.

[0054] In a possible implementation, the strength reinforcing members 5 are provided with through holes for the connecting member 3 to pass through, i.e., the strength reinforcing members 5 are in a ring structure, such as a press ring. Exemplarily, the strength reinforcing members 5 are made of aluminum alloy. The density of the aluminum alloy used in this embodiment is 2.8 g / cm 3 .

[0055] The height of the strength reinforcing members 5 in the potting layer 2 is a key factor affecting the anti-high overload capacity, which is determined by the height of the potting layer. In a preferred implementation, the height of the strength reinforcing members 5 is set to be greater than half of the height of the potting layer and less than the height of the potting layer. By setting the height of the strength reinforcing members 5 to the above specific range, the rudder can have good anti-high overload capacity and meet the space design requirements without affecting other structures. Exemplarily, the height of the strength reinforcing members 5 is 30-60 mm.

[0056] In another possible implementation, the material of the potting layer 2 is potting glue, and the composition of the potting glue mainly comprises epoxy resin, a modified curing agent and a toughening agent.

[0057] Compared with metal materials, the elastic modulus of the epoxy resin is relatively low, the strength is relatively low, and the effect of the anti-overload protection of the motor 1 is slightly weak. The strength reinforcing members 5 in the potting layer 2 are equivalent to adding a metal skeleton in the epoxy resin to increase the anti-high overload capacity of the potting layer 2. The density of the epoxy resin is 1.2 g / cm 3 .

[0058] In this embodiment, the aluminum alloy and epoxy resin with small density are used to ensure the high overload strength and meet the lightweight requirement of the electric rudder, thereby providing more mass space for the design of other components.

[0059] Embodiment two

[0060] Another specific embodiment of the present application discloses an electric rudder with high overload resistance, as shown in the figure, comprising a motor 1, a potting layer 2 of embodiment one, a motor mounting plate 6, a rudder frame and a connecting piece 3; the potting layer 2 is arranged outside the motor 1, and the motor 1, the motor mounting plate 6 and the rudder frame are connected through the connecting piece 3. Figures 3-6

[0061] The connecting piece 3 passes through the through hole of the strength reinforcing piece 5, and the upper surface of the potting layer 2 is lower than the upper surface of the motor 1.

[0062] In this embodiment, the motor mounting plate 6 not only plays a role in fixing the motor 1, but also can offset most of the impact force from the axial direction, thereby protecting the motor in the axial direction.

[0063] The positions of the plurality of strength reinforcing pieces 5 in the potting layer correspond to the positions of the interfaces between the motor 1 and the motor mounting plate 6 and the interfaces between the rudder frame and the motor mounting plate 6, so as to connect the motor 1 and the motor mounting plate 6 and the rudder frame and the motor mounting plate 6 through the through hole of the strength reinforcing piece 5. Exemplarily, the connecting piece 3 is a screw, such as a 12.9 grade strength screw, to resist a larger impact load and increase the high overload resistance.

[0064] As for the number of strength reinforcing pieces 5, it is determined according to the size of the motor 1. Under the premise of meeting the space requirement, the plurality of strength reinforcing pieces 5 are arranged as uniformly as possible to disperse the radial impact force. Exemplarily, the strength reinforcing pieces 5 are 6.

[0065] It should be noted that the three strength reinforcing pieces 5 of the inner ring are used to fix the motor and the motor mounting plate, and the three strength reinforcing pieces of the outer ring are used to fix the motor mounting plate and the rudder frame.

[0066] In a preferred embodiment, a loosening piece 4 is further arranged between the screw head and the upper surface of the strength reinforcing piece 5. For example, a spring washer. By arranging the loosening piece 4, on the one hand, the loosening function can be achieved; on the other hand, the connecting piece 3 is automatically ejected after being screwed to a certain extent, thereby reducing the work load of the operator.

[0067] ​In a preferred embodiment, the electric rudder also comprises a loosening prevention indicating member for assisting in judging whether the connecting member is loosened. The connecting member is provided with a central hole, and at least a part of the loosening prevention indicating member is arranged in the central hole. Whether the connecting member is loosened and the loosening degree can be judged by the positional relationship between the loosening prevention indicating member and the central hole.

[0068] Specifically, initially the loosening prevention indicating member is completely arranged in the central hole, and the upper surface of the loosening prevention indicating member is flush with the upper surface of the connecting member. When the connecting member is loosened, the connecting member moves upward, so that the upper surface of the loosening prevention indicating member is lower than the upper surface of the connecting member, and thus it can be judged that the connecting member is loosened, and the loosening degree of the connecting member can be judged according to the degree that the upper surface of the loosening prevention indicating member is lower than the upper surface of the connecting member.

[0069] In another possible embodiment, a scale can be provided on the outer wall of the loosening prevention indicating member, and a part of the loosening prevention indicating member is arranged in the central hole and a part is arranged outside the central hole. Whether the connecting member is loosened and the loosening degree can be judged according to the scale change of the outer wall of the loosening prevention indicating member.

[0070] Embodiment three

[0071] The existing pouring method is generally to pour the rudder as a whole after the motor and other components are assembled, or to pour the motor separately.

[0072] In another specific embodiment of the present application, a pouring method of an electric rudder is disclosed. The pouring method is to pour the motor 1 together with the motor mounting plate 6, which comprises the following steps:

[0073] Step 1: Check whether the outer surface of the motor 1 and the pouring tooling is smooth and flat.

[0074] Step 2: Clean the surface of the motor 1 and the parts, and dry them.

[0075] Before pouring, the surface of each part and the motor 1 should be cleaned, and the surface should be free of dust, oil stains and other impurities, and then dried, so as to reduce the influence of impurities on the adhesion strength of the pouring glue and the motor 1. By cleaning the surface of the parts and the motor 1 and drying, the adhesion strength of the pouring glue and the motor 1 is enhanced.

[0076] Step 3: Apply silicone rubber around the mounting hole of the motor 1, align the through hole on the strength enhancer 5 with the mounting hole of the motor 1, and fix and connect the motor 1, the strength enhancer 5 and the motor mounting plate 6 by using the stud 7.

[0077] The mounting hole of the motor 1 refers to the surrounding of the mounting hole of the motor 1 on the contact surface between the motor 1 and the strength enhancer 5. By applying silicone rubber around the mounting hole of the motor 1, the pouring glue can be prevented from flowing into the mounting hole of the motor 1, and the stud 7 can be avoided from being poured and cannot be taken out.

[0078] Step 4: Apply silicone rubber around the mounting holes of the motor mounting plate 6, align the through holes on the strength reinforcement with the mounting holes of the motor mounting plate 6, and use the studs 7 to fixedly connect the strength reinforcement 5, the motor mounting plate 6 and the potting bottom plate 9, and prevent the potting glue from overflowing.

[0079] The around the mounting holes of the motor mounting plate 6 refers to the around the mounting holes of the motor mounting plate 6 on the contact surface of the motor mounting plate 6 and the strength reinforcement 5. By applying silicone rubber around the mounting holes of the motor mounting plate 6, the potting glue can be prevented from flowing into the mounting holes of the motor mounting plate 6, and the studs 7 can be prevented from being potted and cannot be removed. The silicone rubber is applied and left for 48 hours.

[0080] Step 5: Install the potting tool.

[0081] Place the potting bottom plate 9 below the motor mounting plate 6, place the potting baffle 8 outside the motor, align the mounting holes on the potting baffle 8 with the mounting holes on the potting bottom plate 9, and fixedly connect them by the screws 10 to form a potting cavity. At this point, the motor potting tool is installed.

[0082] The spring washer and the protection piece are sequentially arranged between the upper surface of the potting bottom plate 9 and the lower surface of the screw head.

[0083] The spring washer has two functions: one is to prevent loosening, and the other is to automatically pop out the screw 10 after the screw is loosened to a certain extent, reducing the work load of the operator. The protection piece reduces friction and prevents scratches on the surface of the product.

[0084] Step 6: Apply release agent in the potting cavity, which is used to facilitate the removal of the tool after the potting glue is cured.

[0085] Step 7: Prepare the potting glue.

[0086] According to the size and proportion of the potting cavity, the potting material is measured and mixed to obtain the potting glue liquid.

[0087] The potting material includes epoxy resin, modified curing agent and toughening agent. During the mixing and stirring of the potting material, a chemical reaction occurs to generate bubbles. The bubbles will remain in the potting glue liquid and affect the potting effect. Therefore, the potting glue liquid is also subjected to bubble removal treatment. For example, the bubbles in the potting glue liquid are extracted by vacuumizing.

[0088] Step 8: Potting.

[0089] Pour the prepared potting glue liquid into the potting cavity. The potting height does not exceed the upper end surface of the potting baffle 8.

[0090] Step 9: Curing.

[0091] The product after potting is left to stand at room temperature for 20-30 hours for curing. Preferably, the curing time is 24 hours.

[0092] Step 10: demolding.

[0093] After the potting glue solution is completely cured, the potting tool is removed to obtain a motor and motor mounting plate assembly with a potting layer. Whether there are air bubbles in the potting layer, whether the filling is complete, and whether there are impurities are checked.

[0094] Step 11: assembly.

[0095] The motor and motor mounting plate assembly are fixed with the rudder frame by using connectors (such as screws) to complete the assembly of the electric rudder.

[0096] Step 12: performance test. The rudder is subjected to an overload test to ensure that the motor works normally and meets the use requirements.

[0097] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An electric actuator with high overload resistance, characterized in that, The application relates to an anti-high-overload protection structure of an electric motor and a rudder, which comprises an electric motor, an anti-high-overload protection structure of a rudder, a motor mounting plate, a rudder frame and connecting pieces. The anti-high-overload protection structure of the rudder comprises a pouring sealing layer, the pouring sealing layer is in a cylindrical shape, a plurality of strength reinforcing pieces are arranged in the pouring sealing layer, the strength reinforcing pieces are dispersedly arranged, and through holes are arranged on the strength reinforcing pieces; and the pouring sealing layer further comprises a hole for accommodating the electric motor. The pouring sealing layer is arranged on the outside of the electric motor, the electric motor and the motor mounting plate are connected through the connecting pieces, the motor mounting plate and the rudder frame are connected through the connecting pieces, and the connecting pieces pass through the through holes on the strength reinforcing pieces to connect the electric motor and the motor mounting plate and the rudder frame and the motor mounting plate. The positions of the strength reinforcing pieces correspond to the positions of the interfaces between the electric motor and the motor mounting plate. The positions of the strength reinforcing pieces correspond to the positions of the interfaces between the rudder frame and the motor mounting plate.

2. The electric actuator of claim 1, wherein, The connecting pieces are screws, and a loosening prevention piece is arranged between the screw heads and the upper surfaces of the strength reinforcing pieces.

3. The electric actuator of claim 2, wherein, The loosening prevention piece is a spring washer.

4. The electric actuator of claim 1, wherein, The strength reinforcing pieces are made of metal, and the hardness of the strength reinforcing pieces is lower than that of the connecting pieces connecting the electric motor and the motor mounting plate.

5. The electric actuator of claim 4, wherein, The metal comprises an aluminum alloy.

6. A potting method of an electric actuator, characterized by, A pouring sealing layer in the electric rudder in the application is formed by the following steps. Step 1: installing a pouring sealing tool; Step 2: preparing pouring sealing glue; Step 3: pouring the prepared pouring sealing glue into the cavity of the pouring sealing tool; Step 4: demolding.

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