Double-scraper window wiper without dead zone in visual field for railway vehicle

Abstract

The invention provides a rail vehicle double-scraper window wiper without a dead zone in the visual field, which comprises a motor, a crank assembly, a connecting rod, a rocker assembly, a bracket, a wiping arm shaft, a wiping arm and scrapers, the crank assembly structure provided by the invention enables the two scrapers to reach an overlapping area of a wiping range one by one, and the problem that the wiping area is not overlapped after the two wiping areas are overlapped is solved. The problem that collision occurs when the two scrapers operate symmetrically is solved, in the operation process, the two scrapers are located at the positions symmetrical relative to the center line of the glass twice, one scraper is close to the center line, the other scraper is close to the edge of the glass, and the position close to the edge of the glass is selected as a parking position, so that the problem of scraping and brushing the wide-area windshield glass is solved; meanwhile, no dead zone influencing the visual field of the driver exists in the visual field.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail vehicle manufacturing, and specifically relates to a double - blade windshield wiper for rail vehicles with no dead zone in the middle of the wiper range of the windshield glass. Background Art

[0002] In recent years, with the continuous development of rail vehicles, the demand for the area of the front windshield has been increasing continuously. Due to the limitation of the size in the height direction, basically the height remains unchanged while the width increases significantly. For the single - blade windshield wiper that is widely used at present, due to the characteristics of its structure, after the wiper range increases to the required width, the height has far exceeded the range of the windshield glass in the height direction, so it is difficult to meet the project requirements.

[0003] Another solution is to set up two sets of independent windshield wipers, arranged horizontally side by side. The left and right blades scrape from both sides of the windshield towards the middle respectively. However, in order to prevent the two blades from colliding with each other, there is no overlapping part in the wiper range of the left - hand blade and the right - hand blade, and there is a dead zone in the middle of the windshield glass that cannot be scraped. At the same time, the two sets of windshield wipers operate completely independently, and there is also a problem of asynchronous scraping between the two blades. Summary of the Invention

[0004] The purpose of the present invention is to solve the defects existing in the prior art, and to provide a double - blade windshield wiper for rail vehicles, which integrates two sets of independent windshield wipers, and is driven by only one motor to drive two sets of transmission mechanisms at the same time, controlling two wiper arms and blades to perform scraping actions.

[0005] To achieve the above - mentioned purpose, the present invention provides a double - blade windshield wiper with no dead zone in the middle of the field of vision for rail vehicles, including a motor, a crank assembly, a connecting rod, a rocker assembly, a bracket, a wiper arm shaft, a wiper arm and a blade. One set of the connecting rod, the rocker assembly, the wiper arm shaft, the wiper arm and the blade are symmetrically arranged on the left and right. The motor is rigidly connected to the crank assembly, the crank assembly is hinged to the connecting rod, the connecting rod is hinged to the rocker assembly, the rocker assembly is rigidly connected to the wiper arm through the wiper arm shaft, and the wiper arm is connected to the blade.

[0006] The motor drives the crank assembly to perform circular motion. Through the connecting rod, it is converted into the reciprocating swing of the rocker assembly, and then drives the wiper arm and the blade to perform scraping actions through the wiper arm shaft, realizing reciprocating swing.

[0007] Further, the crank assembly includes a crank, a first pin, a crank connecting rod and a second pin. The first pin rigidly connects the crank and the crank connecting rod into one body. The second pin is arranged at one end of the crank connecting rod far from the first pin, and the first pin and the second pin are respectively hinged to the connecting rod.

[0008] Further, the connecting pins between the crank and the crank connecting rod are in different planes, ensuring that the crank assembly and the connecting rod do not interfere with each other during movement.

[0009] Furthermore, the included angle between the line connecting the projection position point of the second pin of the crank connecting rod on the plane where the crank is located and the input end of the crank motor and the crank center line is α, and the angle of α is 80°.

[0010] The crank composition structure provided by the present invention enables the two scrapers to reach the overlapping area of the scraping range one after another, solving the problem of collision when the two scrapers run symmetrically after the two scraping areas overlap. During the operation, the two scrapers are in a position symmetrical with respect to the center line of the glass twice. One is closer to the center line and the other is closer to the edge of the glass. The position closer to the edge of the glass is selected as the parking position. Therefore, the problem of scraping wide-area windshield glass is solved, and there is no dead zone affecting the driver's vision in the middle of the field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Front view of the wiper system;

[0012] Figure 2 Rear view of the wiper system;

[0013] Figure 3 Rear view of the wiper system without a motor;

[0014] Figure 4 Right view of the wiper system;

[0015] Figure 5 Side view of the wiper system;

[0016] Figure 6 Partial sectional view of the wiper system;

[0017] Figure 7 Top view of the crank composition;

[0018] Figure 8 Side view of the crank composition;

[0019] Figures 9 to 15 Diagram of the wiper operation process;

[0020] Figures 16 to 21 Schematic diagram of the wiper operation process and the structure of the crank composition at the location.

[0021] In the figure: 1 - motor; 2 - crank composition; 21 - crank; 22 - first pin; 23 - crank connecting rod; 24 - second pin; 25 - virtual crank; 3 - connecting rod; 4 - rocker composition; 5 - bracket; 6 - wiper arm shaft; 7 - wiper arm; 8 - scraper. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the preferred implementation schemes of the present invention will be further elaborated below in conjunction with specific implementation manners and the accompanying drawings.

[0023] Implementation case

[0024] See in detail Figures 1 to 3 The double-scraper windshield wiper disclosed by the present invention includes a motor 1, a crank assembly 2, a connecting rod 3, a rocker assembly 4, a bracket 5, a wiper arm shaft 6, a wiper arm 7 and a scraper 8. Except for the motor 1, the crank assembly 2 and the bracket 5, the rest of the components are a set of left-right symmetric components.

[0025] The rod connecting the output shaft of the motor 1 and the connecting rod 3 is called the crank assembly. The relative relationship between the two cranks of the two sets of transmission mechanisms is the key point of the design. When taking the output shaft of the motor 1 as the center and the angles of the two cranks are fixed and differ by 180°, the two scrapers will symmetrically wipe relative to the center line of the glass, similar to the wiping ranges of two independent windshield wipers. There is a dead zone in the middle of the windshield, but only the problem of possible asynchronous wiping between the two is solved.

[0026] In order to solve the problem of the dead zone and make the wiping ranges of the two scrapers 8 symmetric with respect to the center line of the windshield, the present invention provides the following technical solution: The motor 1 and the crank assembly 2 are rigidly connected, the crank assembly 2 and the connecting rod 3 are hinged, the connecting rod 3 and the rocker assembly 4 are hinged, and the rocker assembly 4 and the wiper arm 7 are rigidly connected through the wiper arm shaft 6.

[0027] The motor 1 drives the crank assembly 2 to perform circular motion. Through the connecting rod 3, it is converted into the reciprocating swing of the rocker assembly 4, and then drives the wiper arm 7 and the scraper 8 to perform the reciprocating wiping action through the wiper arm shaft 6.

[0028] This windshield wiper system is a typical crank-rocker mechanism. The connection between the rods is divided into two types: hinged and rigid. Rigid connection transmits force and torque, and hinged connection only transmits force.

[0029] Refer to Figures 4 to 7 , the crank assembly is the key point of the design and meets two requirements:

[0030] The angle between the projection of the second pin 24 of the crank connecting rod 23 on the plane where the crank 21 is located and the connecting line between the input end of the crank 21 and the motor 1 and the center line of the crank 21 is α, and the angle of α is 80°, ensuring that the operation of the scraper does not interfere.

[0031] The connecting pins between the crank 21 and the crank connecting rod 23 should be in different planes and do not interfere with each other during movement.

[0032] The specific structure is as follows: The crank 21 is rigidly connected to the motor output shaft to output the total torque. At the non-motor output end of the crank 21, the first pin 22 is rigidly connected and hinged to the connecting rod 3 to transmit the torque of one wiper arm; The present invention introduces the concept of a virtual crank 25. The virtual crank 25 is the diagonal side of the crank 21 and the crank connecting rod 23 in the same plane after being fixedly connected, as shown in Figure 7 , the virtual crank 25 is located at the position of the connection line between the projection of the second pin 24 of the crank connecting rod 23 on the plane where the crank 21 is located and the motor input end of the crank. In order to enable the virtual crank 25 to perform the same function as the crank 21, at the other end of the first pin 22, the crank connecting rod 23 is rigidly connected. The length of the crank connecting rod 23 can ensure that the length of the virtual crank 25 is equal to that of the crank 21, and the included angle between the connection line position and the center line of the crank 21 is 80°. At the other end of the crank connecting rod 23, the second pin 24 is rigidly connected, and the second pin 24 is hinged to the connecting rod 3 to transmit the torque of the other wiper arm.

[0033] The operation process of one cycle of the wiper is referred to Figures 9 - 15 .

[0034] During the process of the motor continuously inputting power, according to the motion characteristics of the crank assembly 2, the specific motion trajectory of the wiper blade 8 is as follows. First, the wiper blades 8 on both sides of the wiper are parked at a position 150 mm away from the edges of the glass on both sides, as shown in Figure 9 ; After the wiper is started, the left wiper blade 8 first moves towards the edge of the glass, and the right wiper blade 8 moves towards the center of the glass, as shown in Figure 8 ; The left wiper blade 8 reaches the left extreme position, as shown in Figure 10 . The left wiper blade 8 starts to move towards the middle of the glass, and the right wiper blade 8 reaches its left extreme position, as shown in Figure 11 ; The left wiper blade 8 and the right wiper blade 8 both move to the right, as shown in Figure 12 ; The left wiper blade 8 moves to its right extreme position, as shown in Figure 13 ; The left wiper blade 8 starts to move to the left, and the right wiper blade 8 reaches its right extreme position, as shown in Figure 14 . The left wiper blade 8 and the right wiper blade 8 both return to a position 150 mm away from the edges of the glass on both sides, as shown in Figure 15 , completing a full cycle of operation, and subsequent operations are all cycles of the above cycle.

[0035] Refer to Figures 16 to 21 , the first pin 22 connects the left connecting rod 3, and the second pin 24 connects the right connecting rod. Figure 16 is the starting position of the crank assembly 2. The crank connecting rod 23 coincides with the connecting rods 3 on both sides. The wiper motor 1 is started, and the crank 21 rotates counterclockwise. The crank 21 coincides with the left connecting rod 3. At this time, the left wiper blade 8 is located at the left extreme position, and the right wiper blade 8 continues to move to the left, as shown in Figure 17; When the right scraper 8 reaches the left extreme, at this time the right connecting rod 3 and the virtual crank 25 are in a straight line, and the left scraper 8 continues to move to the right, see Figure 18 ; When the left scraper 8 reaches the right extreme position, at this time the left connecting rod 3 and the crank 21 are in a straight line, and the right scraper 8 continues to move to the right, see Figure 19 ; When the right scraper 8 reaches the right extreme position, at this time the virtual crank 25 coincides with the right connecting rod 3, and the left scraper 8 continues to move to the left, see Figure 20 ; When the two scrapers 8 return to the starting position at the same time, the crank connecting rod 23 coincides with the two connecting rods 3, see Figure 21 ; Completing one full cycle of operation. The scraping ranges of the two scrapers 8 are symmetric about the center line of the windshield, and there will be an overlapping area with a width of 200 mm (this value can be adjusted according to the actual situation), solving the problem of scraping wide-area windshields, and there is no dead zone in the middle of the field of view that affects the driver's vision.

Claims

1. A double - blade windshield wiper with no dead zone in the middle of the field of view for rail vehicles, characterized in that, It includes a motor (1), a crank assembly (2), a connecting rod (3), a rocker assembly (4), a bracket (5), a wiper arm shaft (6), a wiper arm (7) and a wiper blade (8). The connecting rod (3), the rocker assembly (4), the wiper arm shaft (6), the wiper arm (7) and the wiper blade (8) are each provided with a set that is symmetric left and right. The motor (1) and the crank assembly (2) are rigidly connected. The crank assembly (2) and the connecting rod (3) are hinged. The connecting rod (3) and the rocker assembly (4) are hinged. The rocker assembly (4) and the wiper arm (7) are rigidly connected through the wiper arm shaft (6). The wiper arm (7) is connected to the wiper blade (8). The motor (1) drives the crank assembly (2) to perform circular motion. Through the connecting rod 3, it is converted into the reciprocating swing of the rocker assembly (4), and then the wiper arm (7) and the wiper blade (8) are driven through the wiper arm shaft (6) to perform a wiping action, realizing reciprocating swing.

2. The double wiper for a rail vehicle with no dead zone in the middle of the field of vision according to claim 1, characterized in that, The crank assembly (2) includes a crank (21), a first pin (22), a crank connecting rod (23) and a second pin (24). The first pin (22) rigidly connects the crank (21) and the crank connecting rod (23) into one body. The second pin (24) is arranged at one end of the crank connecting rod (23) that is far from the first pin (22). The first pin (22) and the second pin (24) are respectively hinged to the connecting rod (3).

3. The double wiper for rail vehicles without dead zones in the middle of the field of vision according to claim 1, characterized in that, The connecting pins between the crank (21) and the crank connecting rod (23) are in different planes, ensuring that the crank assembly (2) and the connecting rod do not interfere with each other during movement.

4. The double-blade windshield wiper for rail vehicles without a dead zone in the middle of the field of vision according to claim 1, characterized in that, The included angle between the line connecting the projection position point of the second pin (24) of the crank connecting rod (23) on the plane where the crank (21) is located and the input end of the motor (1) of the crank (21) and the center line of the crank (21) is a, and the angle of a is 80°.

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