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CN-115052791-B - Wiper device for a detection system

CN115052791BCN 115052791 BCN115052791 BCN 115052791BCN-115052791-B

Abstract

The invention relates to a wiper device (3) for a detection system (1) of a vehicle, comprising a wiper blade (10), a wiper arm (9), a motor unit (5) and a drive unit (6), the drive unit (6) comprising a guide block (8) carrying the wiper arm (9), which guide block is inserted into a guide frame (4), the drive unit (6) comprising a plurality of pulleys (61, 62), at least one drive pulley (61) being driven in a rotational movement by the motor unit (5), characterized in that the drive unit (6) comprises a belt (7) which is driven by the pulleys (61, 62) and moves the guide block (8) in accordance with a linear movement.

Inventors

  • S. Stefani

Assignees

  • 法雷奥系统公司

Dates

Publication Date
20260505
Application Date
20210111
Priority Date
20200207

Claims (11)

  1. 1. A wiper device (3) for a detection system (1) of a vehicle, comprising a wiper blade (10), a wiper arm (9), a motor unit (5) and a drive unit (6), which drive unit (6) comprises a guide block (8) carrying the wiper arm (9), which guide block is inserted into a guide frame (4), which drive unit (6) comprises a plurality of pulleys (61, 62), at least one drive pulley (61) being driven in rotational movement by the motor unit (5), characterized in that the drive unit (6) comprises a belt (7) which is driven by the pulleys (61, 62) and moves the guide block (8) in accordance with a linear movement, which guide block (8) comprises a first attachment (81) for the wiper arm (9) and a second attachment (82) for the belt (7), and in that the first attachment (81) of the guide block (8) passes through an opening (41) of the guide frame (4).
  2. 2. A wiper device (3) according to claim 1, comprising two driven pulleys (62) arranged on each end point of the guide frame (4).
  3. 3. A wiper device (3) according to claim 2, wherein at least one driven pulley (62) is carried by a pulley support (43) arranged on the guide frame (4).
  4. 4. A wiper device (3) according to claim 2 or 3, wherein the belt (7) is a toothed belt, and the driving pulley (61) and the driven pulley (62) are toothed pulleys to interact with the belt (7).
  5. 5. A wiper device (3) according to any one of claims 1 to 3, wherein the guide frame (4) comprises a guide groove (42) into which the guide block (8) is slidingly inserted.
  6. 6. A wiper device (3) according to any one of claims 1 to 3, wherein the second accessory (82) comprises a cavity (83) in which the strip (7) is inserted, and a fixed cover (84) comprising a form (85) complementary to the strip (7).
  7. 7. A wiper device (3) according to any one of claims 1 to 3, wherein the motor unit (5) comprises a motor (51) and a gear box (52), the motor (51) comprising a motor shaft (55) moving according to a unidirectional rotational movement, the gear box (52) being driven by the motor shaft (55) and driving the driving pulley (61) according to a reversible rotational movement.
  8. 8. A wiper device (3) according to claim 7, wherein the motor rotation axis (500) is perpendicular to the drive pulley rotation axis (600).
  9. 9. A detection system (1) for a vehicle, comprising a sensor (2) and a wiper device (3) according to any one of the preceding claims.
  10. 10. The detection system (1) according to claim 9, comprising a windscreen (11) configured to be placed in front of the sensor (2) of the detection system (1).
  11. 11. The detection system (1) according to claim 10, wherein the windshield (11) comprises a cleaning area (12) wiped by the wiper blade (10), the length (100) of the cleaning area (12) being dependent on the diameter (200) of the drive pulley (61) and the rotation angle (300) of the drive pulley (61).

Description

Wiper device for a detection system Technical Field The present invention relates to the field of wiping devices for vehicles. More particularly, the present invention relates to a wiper device for a vehicle detection system. Background Nowadays, more and more vehicles are equipped with detection systems, such as parking assistance systems or lidar systems, which are present in many of the latest vehicles. This is why the problem of how to clean these detection systems is raised soon. It is known to use some wiper devices provided with wiper blades and wiper arms. The wiper blade carried by the wiper arm and driven by the motor wipes the detection system, either an optical surface or a window arranged in front of the detection system. Thus, the wiper device allows a clear view of the detection system in case of rain or in case of cleaning. The motor activates the wiper arm and the wiper blade. This type of motor generally generates a rotational movement, and the wiper device must convert the rotational movement of the motor into a linear movement. Thus, the wiper blade moves back and forth over the surface to be cleaned. This conversion of motion needs to be done in a smooth way and without any mechanical disturbances. Disclosure of Invention The invention allows optimizing such a movement conversion by providing a wiper device for a vehicle detection system, which wiper device comprises a wiper blade, a wiper arm, a motor unit and a drive unit, which drive unit comprises a guide block carrying the wiper arm, which guide block is inserted into a guide frame, which drive unit comprises a plurality of pulleys, at least one drive pulley being driven in a rotational movement by the motor unit, characterized in that the drive unit comprises a belt driven by the pulleys, which belt moves the guide block in accordance with a linear movement. The wiper arm and the wiper blade are configured to be disposed in a linear motion. The wiper blade is arranged against a surface to be cleaned and the linear movement allows wiping the surface according to a back and forth movement. The drive unit is an intermediate part between the motor unit and the wiper arm and has the function of converting the rotational movement initiated by the motor unit into a linear movement of the wiper arm without mechanical interference. The guide block sets the wiper arm and the wiper blade in linear motion and thus also in linear motion. The guide frame has a function of guiding the guide block in order to keep the guide block in its straight track. The guide frame mainly extends according to a direction parallel to the surface to be cleaned, and the guide block always moves along the guide frame. The motor unit rotates the driving pulley. This rotational movement is reversible, meaning that the motor unit rotates between a clockwise movement and a counter-clockwise movement and transmits this movement to the drive pulley. Such reversible rotary motion may be an electrically reversible motion of a mechanically reversible motion. This reversible rotational movement results in a reversible linear movement of the guide block, which allows a back and forth movement of the wiper blade relative to the surface to be cleaned. The belt is contained in a drive unit with pulleys and guide blocks. More specifically, the belt carries a guide block and is at least actuated by a drive pulley. Due to the belt, the rotational movement of the drive pulley is converted into a linear movement of the guide block. The belt is arranged into the drive unit in order to perform such a conversion, which conversion operates without any mechanical intervention. According to an aspect of the invention, the wiper device comprises two driven pulleys arranged on each end point of the guide frame. In contrast to the drive pulley, which is directly activated by the motor unit, the driven pulley is activated by the belt. Each driven pulley has the same size and is disposed on each end point of the guide frame. In other words, a portion of the belt between each driven pulley extends in a straight direction, and the guide block is attached to this portion of the belt and moves from one driven pulley to the other driven pulley. The layout of the driven pulleys thus takes part in the conversion of rotational motion into linear motion. According to an aspect of the invention, the at least one driven pulley is carried by a pulley support arranged on the guide frame. For example, the wheeled support may be molded into the guide frame. The pulley support may be constituted by two strips comprising a hole and separated by a distance allowing the driven pulley to be established between the two strips of the pulley support. The driven pulley includes a bore in its center, and a rod may be disposed through each of the two flights and the bore of the driven pulley. The rods are attached by, for example, gluing. The driven pulley is free to rotate about the rod and any other movement of the d