Helicopter-mounted windshield wiper

Abstract

The utility model relates to the technical field of windshield wipers, and discloses a helicopter airborne windshield wiper which comprises a brush piece assembly and a mounting plate assembly, a main brush arm assembly and an auxiliary brush arm assembly are rotationally connected to the brush piece assembly, and a brush arm connecting frame is connected between the main brush arm assembly and the auxiliary brush arm assembly; a mounting shell is fixed to the bottom of the mounting plate assembly. A swing arm assembly is connected to the end, away from the brush arm connecting frame, of the main brush arm assembly, and a driving shaft assembly is connected to the swing arm assembly. The end, away from the brush arm connecting frame, of the auxiliary brush arm assembly is connected with a fixing shaft assembly. The structure is compact, the arrangement is reasonable, the space is utilized to the maximum extent, the appearance size is reduced, meanwhile, the product weight is reduced, the product requirement is not larger than 3.5 kg, and the product design weight is 2.5 kg; and the output shaft of the motor reducer assembly is vertical to the surface of the windshield glass, so that the pressing force of the brush sheet is not changed, the movement is stable, and the power consumption of the product is reduced.

Description

Technical Field

[0001] This application relates to the technical field of windshield wipers, and in particular to a helicopter airborne windshield wiper. Background Art

[0002] As one of the most distinctive creations of aviation technology in the 20th century, helicopters have greatly expanded the application scope of aircraft. Helicopters are typical dual-use products for military and civilian use and can be widely applied in multiple fields such as transportation, patrol, tourism, and ambulance. To facilitate helicopter driving in rainy days, existing helicopter windshield glass is also equipped with windshield wipers.

[0003] However, after long-term use of existing helicopter windshield wipers, the pressing force of the wiper blade decreases, resulting in the wiper blade not being able to closely fit the windshield glass, unable to move smoothly, and thus unable to normally wipe rain to achieve the effective purpose, making it inconvenient for normal use. Utility Model Content

[0004] To solve the problem, this application provides a helicopter airborne windshield wiper.

[0005] The helicopter airborne windshield wiper provided by this application adopts the following technical solutions:

[0006] A helicopter airborne windshield wiper includes a wiper blade assembly and a mounting plate assembly. A main wiper arm assembly and a secondary wiper arm assembly are respectively rotatably connected to the wiper blade assembly. A wiper arm connecting frame is connected between the main wiper arm assembly and the secondary wiper arm assembly. A mounting housing is fixed to the bottom of the mounting plate assembly. One end of the main wiper arm assembly away from the wiper arm connecting frame is connected to a swing arm assembly assembly, and a drive shaft assembly is connected to the swing arm assembly assembly. One end of the secondary wiper arm assembly away from the wiper arm connecting frame is connected to a fixed shaft assembly, and the fixed shaft assembly is fixed to the mounting plate assembly.

[0007] Optionally, a filter component is connected to the mounting housing.

[0008] Optionally, the swing arm assembly assembly includes a swing arm body, a ratchet shaft, a ratchet body, a pawl body, and a pawl spring. The ratchet body meshes with the pawl body. The pawl spring is respectively connected to the swing arm body and the pawl body. The pawl body and the ratchet body are both rotatably connected to the swing arm body.

[0009] Optionally, a control circuit board assembly is installed at the inner bottom end of the mounting housing.

[0010] Optionally, a drive motor is installed inside the mounting housing. A reduction gear set is connected to the output shaft of the drive motor, and the drive motor is fixed to the mounting housing.

[0011] Optionally, a crank rocker mechanism is installed on one inner side of the installation housing. The crank rocker mechanism is connected to the drive shaft assembly. The crank rocker mechanism consists of a long eccentric shaft, a short eccentric shaft, a connecting rod, and a housing.

[0012] Optionally, a tension spring is connected between the main brush arm assembly and the swing arm body. The main brush arm assembly can move through the elastic force of the tension spring.

[0013] In summary, the present application includes the following beneficial technical effects:

[0014] By setting a functional modular design, each functional module is independent and adopts a relatively enclosed design, and has relatively independent functions; the filter component is mainly used for EMI protection of the product; the control circuit board component is used for product control and motor drive, and is connected to the filter component and the motor through an electrical connector and can be quickly disassembled; the reduction gear set realizes the reduction of the motor output; the crank rocker mechanism realizes the conversion of rotation into reciprocating rotation at a certain angle; the structure is compact, the layout is reasonable, the space is utilized to the greatest extent, the external dimensions are reduced, and at the same time the weight of the product is reduced. The product requirement is not more than 3.5 kg, and the designed weight of the product is 2.5 kg; the output shaft of the motor reducer assembly is perpendicular to the windshield surface. Therefore, during brushing, the pressing force of the brush piece remains unchanged, the movement is stable, and the power consumption of the product is reduced. Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the windshield wiper device;

[0016] Figure 2 is a three-dimensional structural schematic diagram of the brush arm assembly assembly;

[0017] Figure 3 is a three-dimensional structural schematic diagram of the swing arm assembly assembly;

[0018] Figure 4 is a three-dimensional structural schematic diagram of the motor reducer assembly assembly;

[0019] Figure 5 is Figure 4 a three-dimensional structural schematic diagram showing internal components;

[0020] Figure 6 is a schematic diagram of the control principle of the windshield wiper device.

[0021] Description of the reference numerals: 1. wiper blade assembly; 2. mounting plate assembly; 3. drive shaft assembly; 4. fixed shaft assembly; 5. mounting housing; 6. filter assembly; 7. swing arm assembly assembly; 8. main wiper arm assembly; 81. tension spring; 9. secondary wiper arm assembly; 10. wiper arm connecting bracket; 11. swing arm body; 12. ratchet shaft; 13. ratchet body; 14. pawl body; 15. pawl spring; 16. reduction gear set; 17. crank rocker mechanism; 18. drive motor; 19. control circuit board assembly. Detailed implementation mode

[0022] The following is a further detailed description of this application in conjunction with the attached Figures 1 - 6 drawings.

[0023] An embodiment of this application discloses a helicopter airborne windshield wiper. Referring to Figures 1 - 6 , a helicopter airborne windshield wiper includes a wiper blade assembly 1 and a mounting plate assembly 2. A main wiper arm assembly 8 and a secondary wiper arm assembly 9 are respectively rotatably connected to the wiper blade assembly 1. A wiper arm connecting bracket 10 is connected between the main wiper arm assembly 8 and the secondary wiper arm assembly 9. The bottom of the mounting plate assembly 2 is fixed with a mounting housing 5, and a control circuit board assembly 19 is installed at the inner bottom end of the mounting housing 5; One end of the main wiper arm assembly 8 away from the wiper arm connecting bracket 10 is connected with a swing arm assembly assembly 7, and a drive shaft assembly 3 is connected to the swing arm assembly assembly 7; One end of the secondary wiper arm assembly 9 away from the wiper arm connecting bracket 10 is connected with a fixed shaft assembly 4, and the fixed shaft assembly 4 is fixed on the mounting plate assembly 2. The main wiper arm assembly 8 realizes the transmission of torque, drives the wiper blade assembly 1 to move together, and provides a pressing force. The wiper arm connecting bracket 10 is used to fix the wiper blade assembly 1 and is connected to the secondary wiper arm assembly 9 to form a quadrilateral mechanism for forming and increasing the wiping range of the wiper blade.

[0024] The uniform distribution of the wiper blade pressing force is realized by the bridge arm on the wiper blade assembly 1 and the steel bars on both sides of the wiper blade rubber strip. The bridge arm disperses the pressing force of the wiper arm to each point on the wiper blade, and then the steel bars on both sides of the rubber strip disperse the pressing force to the entire length of the wiper blade.

[0025] In this embodiment, as Figure 1 and Figure 5 shown, a filter assembly 6 is connected to the mounting housing 5, and the filter assembly 6 is mainly used for EMI protection of the product.

[0026] In this embodiment, as Figure 2 and Figure 3As shown, the swing arm assembly 7 includes a swing arm body 11, a ratchet shaft 12, a ratchet body 13, a pawl body 14 and a pawl spring 15. The ratchet body 13 meshes with the pawl body 14. The pawl spring 15 is respectively connected to the swing arm body 11 and the pawl body 14. The pawl body 14 and the ratchet body 13 are both rotatably connected to the swing arm body 11. The aforementioned ratchet mechanism is used to adjust the pressing force of the brush assembly 1. Due to the characteristics of the ratchet mechanism, there will be no loosening phenomenon after the pressing force is adjusted. The ratchet shaft 12 is connected to the ratchet body 13 by a tenon and rotates together. The ratchet shaft 12 is machined with an internal hexagonal groove and can be rotated by a common internal hexagonal wrench. The pawl body 14 is reversely equipped with a pawl spring 15. The pawl spring 15 always contacts the ratchet body 13 through its elastic force. The end finger of the pawl body 14 can be contacted, which is convenient for adjustment.

[0027] In the middle of the front end of the swing arm body 11, a fixed pin groove is designed, which is used in cooperation with a fixed pin to lift and hold the main brush arm assembly 8 when installing or replacing the brush assembly 1, facilitating installation and disassembly.

[0028] In this embodiment, as Figure 4 and Figure 5 shown, a drive motor 18 is installed inside the installation housing 5. A reduction gear set 16 is connected to the output shaft of the drive motor 18. The drive motor 18 is fixed to the installation housing 5. The reduction gear set 16 realizes the reduction of the output of the drive motor 18.

[0029] The drive motor 18 is a brushless motor. Therefore, the motor speed can be adjusted by inputting a certain voltage or a PWM wave with different duty cycles to the control input pin of the motor control chip. After deceleration, the high-speed and low-speed scraping rates of the product are realized; the input signal is discriminated through a decoder to determine whether the external input is one-way or multi-way, so as to control the working speed of the motor; for the control of the intermittent gear position, the working and stopping time of the windshield wiper is timed through an integration timing circuit and a trigger, and finally the intermittent movement control of the windshield wiper device is realized; to reduce the maximum working current of the windshield wiper device, when the product works at high speed, the corresponding motor working speed is near the highest efficiency point in the motor efficiency curve, reducing the maximum working current of the product.

[0030] In this embodiment, as Figure 1 and Figure 5As shown, a crank-rocker mechanism 17 is installed on one inner side of the installation housing 5. The crank-rocker mechanism 17 is connected to the drive shaft assembly 3. The crank-rocker mechanism 17 consists of a long eccentric shaft, a short eccentric shaft, a connecting rod, and a housing. Since the rocker reciprocates a certain angle when the crank in the crank-rocker mechanism 17 rotates one circle, the detection of the reset position can be achieved by installing position sensors on the crank and the housing. The position detection is realized through a magnet and a Hall sensor. This implementation method is non-contact, featuring reliable operation and long service life. Through a logic conversion circuit, when it is determined that an external input stops the automatic reset signal, it is then detected whether the reset position has been reached. If not, the low-speed rotation is continued. If it has been reached, the drive motor 18 is braked to stop, enabling the product to automatically reset when it stops.

[0031] In this embodiment, as Figure 1 and Figure 2 shown, a tension spring 81 is connected between the main brush arm assembly 8 and the swing arm body 11. The main brush arm assembly 8 can move through the elastic force of the tension spring 81. The pressing force of the brush blade assembly 1 on the glass is realized by pulling the main brush arm assembly 8 through the tension spring 81, and the adjustment of the pressing force is achieved.

[0032] According to the requirements of the scraping angle and the shape of the glass, it is determined to use a quadrilateral mechanism to achieve a larger scraping area range within the specified scraping angle range. The quadrilateral mechanism consists of the output shaft of the reducer in the reduction gear set 16, which is respectively connected to the drive shaft assembly 3 and the fixed shaft assembly 4 on the mounting plate assembly 2 to form the first side. The main brush arm assembly 8 and the auxiliary brush arm assembly 9 form the second side and the third side, and the brush arm connecting frame 1 forms the fourth side, finally forming a quadrilateral mechanism. The body scraping range can be adjusted through calculation and the part dimensions on the digital model to achieve the maximum scraping range.

[0033] The implementation principle of a helicopter airborne windshield wiper in an embodiment of this application is as follows: When a signal is input to the corresponding signal line externally, the signal is transmitted to the wiper control circuit board. After logical conversion by the control circuit board, the given signal is converted into different control voltages and input to the motor control chip. The motor control chip adjusts the output of a PWM wave with a certain duty cycle according to the input voltage. The PWM wave drives the power device, and the power device drives the motor 18 to rotate. After the drive motor 18 drives the reduction gear set 16 to decelerate, it drives the crank-rocker mechanism 17 to convert the continuous rotational motion into a reciprocating rotational motion at a certain angle. The output shaft of the motor reducer assembly drives the brush arm and the brush blade assembly to move together.

[0034] The following points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent the relative positional relationship. When the absolute position of the object being described changes, the relative positional relationship may change;

[0035] Second, in the drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0036] Finally, the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0037] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, any equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A helicopter windshield wiper, comprising a wiper blade assembly (1) and a mounting plate assembly (2), characterized in that: A main brush arm assembly (8) and an auxiliary brush arm assembly (9) are rotatably connected to the brush sheet assembly (1), a brush arm connecting frame (10) is connected between the main brush arm assembly (8) and the auxiliary brush arm assembly (9), and a mounting shell (5) is fixed to the bottom of the mounting plate assembly (2); A swing arm assembly (7) is connected to one end of the main brush arm assembly (8) away from the brush arm connecting frame (10), and a drive shaft assembly (3) is connected to the swing arm assembly (7); One end of the auxiliary brush arm assembly (9) away from the brush arm connecting frame (10) is connected to a fixed shaft assembly (4), and the fixed shaft assembly (4) is fixed on the mounting plate assembly (2).

2. A helicopter windshield wiper according to claim 1, characterized in that: The installation housing (5) is connected to a filter assembly (6).

3. A helicopter windshield wiper according to claim 1, characterized in that: The swing arm assembly (7) comprises a swing arm body (11), a ratchet shaft (12), a ratchet body (13), a pawl body (14) and a pawl spring (15); the ratchet body (13) is meshed with the pawl body (14); the pawl spring (15) is connected to the swing arm body (11) and the pawl body (14) respectively; the pawl body (14) and the ratchet body (13) are both rotatably connected to the swing arm body (11).

4. A helicopter windshield wiper according to claim 1, characterized in that: A control circuit board assembly (19) is installed at the inner bottom end of the installation shell (5).

5. The helicopter windshield wiper according to claim 1, characterized in that: A driving motor (18) is installed inside the installation shell (5), a reduction gear set (16) is connected to the output shaft of the driving motor (18), and the driving motor (18) is fixed on the installation shell (5).

6. A helicopter windshield wiper according to claim 5, characterized in that: A crank arm rocker mechanism (17) is installed on one side of the interior of the mounting shell (5). The crank arm rocker mechanism (17) is connected to the drive shaft assembly (3). The crank arm rocker mechanism (17) is composed of a long eccentric shaft, a short eccentric shaft, a connecting rod and a shell.

7. A helicopter windshield wiper according to claim 3, characterized in that: A tension spring (81) is connected between the main brush arm assembly (8) and the swing arm body (11), and the main brush arm assembly (8) can move by the elastic force of the tension spring (81).

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