JP4171756B2 - Vehicle wiper device - Google Patents

Description

  The present invention relates to a vehicle wiper device for wiping a windshield glass of an automobile.

  A vehicle wiper device that wipes windshield glass of automobiles, etc., has a wide range of retractable wiper arms so that the area of the windshield glass is not wiped out as much as possible (so that the wiping range is expanded). A wiper type device has been proposed, and among these wide-area wiper type wiper devices, a wiper device including a wiper arm called a four-bar link type wiper arm is known (for example, Patent Document 1). reference).

  In this type of wiper device including a wiper arm of a four-bar link type, a pair of main lever and sub lever are provided. The main lever is connected and fixed to the pivot shaft, and the sub lever is rotatably supported by a support shaft provided at a position spaced apart from the pivot shaft by a predetermined distance. Further, the main lever and the sub lever are arranged in parallel with each other, and the arm head is rotatably connected to the respective tip portions.

  When the main lever rotates together with the pivot shaft, the arm head to which the sub lever is connected rotates while moving relatively away from the pivot shaft, and as a result, the entire length of the wiper arm expands and contracts. Thereby, at the predetermined wiping position, the entire length of the wiper arm is apparently extended, and the wiping range is expanded. Therefore, for example, when wiping a windshield glass surface whose longitudinal dimension is set to be relatively long, a wiper device having a general wiper arm (the arm head is directly fixed to the pivot shaft, and the wiper arm and the wiper blade are simply connected to the wiper arm). Compared to the case where the reciprocating arc rotates around the pivot axis), it is difficult to generate an unwiped area in the entire area of the windshield glass surface.

  By the way, in the wiper device disclosed in the above publication, a pivot shaft to which a main lever that gives a rotational driving force to the wiper arm is fixed, a pivot shaft support portion that supports the pivot shaft, and a posture of the wiper arm as the wiper arm rotates. A driven shaft (idle shaft) to which a sub-lever that restricts the rotation is fixed and a pivot shaft support portion that supports the driven shaft are integrally provided in one large frame. Further, a wiper motor is attached to the frame, and a pivot shaft to which the main lever is fixed is reciprocally rotated by a link mechanism connected to the output shaft of the wiper motor.

  However, in such a wiper device, a four-bar link consisting of a main lever and a sub-lever, a pivot shaft, and a driven shaft are arranged on one side of a large frame, and a link for reciprocally rotating these links. Since the mechanism cannot be configured because the driven shaft is obstructed as it is, the wiper motor is linked to the other side surface of the same frame as the link mechanism. It has a configuration in which it is arranged at a further separated position avoiding the operating region of the mechanism. Therefore, the space occupied by the wiper device along the axial direction of the pivot shaft (from one side of the frame to the other side) becomes large, and a large mounting space must be secured. It was.

Furthermore, in order to reduce fluctuations in the rotational speed of the pivot shaft, a moderately long link connecting rod (a rod constituting the link mechanism) is required, and this also moves the wiper motor (its output shaft) away from the pivot shaft. There is also a problem that the frame has to be arranged at a position, and the frame becomes large, which increases weight and costs.
JP 2000-25578 A

  In consideration of the above fact, the present invention has a plurality of wipers including at least a first wiper and a second wiper, and each wiper wipes a wiping surface in synchronization with each other by a link mechanism operated by a wiper motor. In the vehicle wiper device in which at least the first wiper is rotated by the four-bar link to wipe the wiper by expanding the wiping range, the space occupied by the device along the axial direction of the pivot shaft can be reduced. An object of the present invention is to obtain a vehicle wiper device that can be reduced in size and weight while reducing the overall cost of the entire device.

  According to a first aspect of the present invention, a vehicle wiper device includes a plurality of wipers including at least a first wiper and a second wiper, and each wiper wipes a wiping surface in synchronization with each other by a link mechanism operated by a wiper motor. In addition, in the vehicle wiper device in which at least the first wiper of the plurality of wipers is rotated by the four-bar link to wipe the wiping range to be wiped, the four-bar link of the first wiper includes a frame member A first pivot shaft rotatably supported on one side, a main lever fixed to the first pivot shaft and rotated together with the first pivot shaft, and one side of the frame member that is the same as the first pivot shaft A driven shaft that is rotatably supported at a predetermined distance from the first pivot shaft, a sub-lever that rotates together with the driven shaft, and a tip portion of the main lever An arm head that is rotatably connected via a main lever connecting shaft and a tip end portion of the sub lever is rotatably connected via a sub lever connecting shaft, and the wiper motor includes the frame member A part of the output shaft in the axial direction is disposed on the one side of the frame member and between the first pivot shaft and the driven shaft, and the other part of the output shaft. Is arranged on the other side of the frame member.

  In the vehicle wiper device according to the first aspect, when the wiper motor is driven, the second pivot shaft is driven via the first link connected to the output shaft, and the second wiper is reciprocally rotated. At the same time, when the second pivot shaft is driven, the first pivot shaft is driven via the second link connected to the second pivot shaft, and the main lever is rotated together with the first pivot shaft. The When the main lever is rotated, the arm head is rotated relative to and away from the first pivot shaft by the sub lever that regulates the operation of the arm head by following the rotation of the main lever. The first wiper is reciprocated while the full length is expanded and contracted.

  Thereby, at the predetermined wiping position, the entire length of the wiper arm of the first wiper is apparently extended, and the wiping range is expanded. Therefore, as compared with a wiper device provided with a general wiper arm, it is difficult to generate an unwiped area in the entire area of the windshield glass surface.

  Here, in the vehicle wiper device according to the first aspect, since the output shaft of the wiper motor is disposed between the first pivot shaft and the driven shaft when viewed from the axial direction, the frame member is a fixed link of a four-bar link. The wiper motor can be attached without providing a portion that largely protrudes from the portion constituting the. That is, the frame member and the entire apparatus can be reduced in size and weight. Further, since the output shaft of the wiper motor is located on both sides of the frame member, the wiper motor can be arranged on the opposite side of the link mechanism with respect to the frame member.

  A vehicle wiper device according to a second aspect of the present invention is the vehicle wiper device according to the first aspect, wherein the wiper motor is disposed on one side of the frame member, and a distal end side of the output shaft is disposed on the frame member. A first link connecting the second pivot shaft, which is disposed on the other side of the frame member and to which the second wiper is fixed, and the output shaft of the wiper motor; The frame member is configured to include a second link that is disposed on the other side of the frame member and connects the second pivot shaft and the first pivot shaft.

  3. The vehicle wiper device according to claim 2, wherein the wiper motor is on one side of the frame member (the side on which the first pivot shaft, the main lever, the driven shaft, the sub lever, and the like constituting the four-bar link of the first wiper are arranged). In addition, since the output shaft is disposed between the first pivot shaft and the driven shaft, most of the wiper motor is disposed between the first pivot shaft and the driven shaft. In other words, the wiper motor is attached by utilizing the space (the space between the frame member and the four-bar link) between the first pivot shaft and the driven shaft of the frame member. In addition, since the output shaft of the wiper motor passes through the frame member and projects to the other side of the frame member between the first pivot shaft and the driven shaft, the space occupied by the wiper motor, that is, the first pivot shaft and The space occupied by the wiper device along the axial direction of the driven shaft (from one surface of the frame member to the other surface) is significantly reduced. Therefore, the frame member and the entire apparatus can be reduced in size and weight, and there is no need to secure a large apparatus mounting space. In addition, since the mold apparatus for manufacturing the frame member and the like can be reduced in size, the manufacturing cost can be reduced.

  In addition, when the rotational motion of the wiper motor is converted into a reciprocating swing motion via the link mechanism, if the distance between the output shaft of the wiper motor and the pivot shaft connected thereto is short, the rotational speed fluctuation of the pivot shaft becomes large. .

  In this respect, in the vehicle wiper device according to the second aspect, as described above, the output shaft of the wiper motor passes through the frame member and protrudes to the other side of the frame member between the first pivot shaft and the driven shaft. In addition, the first link that connects the output shaft of the wiper motor and the second pivot shaft, and the second link that connects the second pivot shaft and the first pivot shaft are arranged on the other side of the frame member. In other words, the link mechanism disposed on the other side of the frame member first transmits the driving force of the wiper motor to the second pivot shaft via the first link, and rotates the link mechanism. Since the rotational force of the second pivot shaft is transmitted to the first pivot shaft via the second link and the first pivot shaft is rotated in synchronization with each other, the output shaft of the wiper motor and the first pivot shaft Distance between Is a short positional relationship, it is possible to secure a sufficiently long distance from the second pivot shaft connected thereto and an output shaft of the wiper motor, it is possible to reduce the rotational speed variation of the first pivot shaft.

  Thus, in the vehicle wiper device according to the second aspect, the space occupied by the device along the axial direction of the pivot shaft can be reduced, and the entire device can be reduced in size and weight and the cost can be reduced. Furthermore, the rotational speed fluctuation of the pivot shaft (wiper arm) is also reduced.

A vehicle wiper device according to a third aspect of the present invention is the vehicle wiper device according to the second aspect, wherein the pivot holder that rotatably supports the second pivot shaft of the second wiper is provided on the first pivot shaft. On the other hand, it is arranged on the opposite side to the wiper motor and is connected to the frame member by a connecting frame.

  In the vehicle wiper device according to claim 3, since the pivot holder that rotatably supports the second pivot shaft is configured independently of the frame member, the pivot holder and the frame member are separately small. Can be formed. Thus, by forming the apparatus by connecting the pivot holder formed in a small size to the frame member by the connection frame, the entire apparatus can be handled as an integral unit, and of course, the apparatus can be reduced in size and weight.

  The vehicle wiper device according to a fourth aspect of the present invention is the vehicle wiper device according to the second or third aspect, wherein the first pivot shaft of the first wiper has a base end portion of the frame member. It protrudes on the other side and is characterized in that the second link is connected to the base end portion.

  5. The vehicle wiper device according to claim 4, wherein not only the link mechanism (that is, the first link) that operates the second wiper (second pivot shaft) but also the link mechanism that operates the first wiper (first pivot shaft). (That is, the second link) can also be arranged together on the other side of the frame member, so that the space occupied by the operation of the device can be kept small, and the device can be configured compactly as a whole. it can.

  The vehicle wiper device according to a fifth aspect of the present invention is the vehicle wiper device according to any one of the first to fourth aspects, wherein the second wiper is fixed to the second pivot shaft and the second wiper shaft is fixed. A second main lever that rotates together with the two pivot shafts, a second driven shaft that is rotatably supported on the same side as the second pivot shaft and spaced apart from the second pivot shaft, and the second driven shaft. A second sub-lever that rotates together with the shaft and a tip end portion of the second main lever are rotatably connected via a second main lever connecting shaft, and a tip end portion of the second sub lever is connected via a second sub-lever connecting shaft. And a second arm head that is rotatably connected to each other, and has a second four-bar link.

  In the vehicle wiper device according to the fifth aspect, when the second pivot shaft is driven by driving the wiper motor, the second main lever is rotated together with the second pivot shaft. When the second main lever is rotated, the second arm head is moved closer to and away from the second pivot shaft by the second sub lever that regulates the operation of the second arm head by following the rotating operation of the second main lever. As a result, the second wiper is reciprocally rotated while the entire length of the wiper arm expands and contracts.

  Thereby, not only the first wiper but also the entire length of the wiper arm of the second wiper is apparently extended at the predetermined wiping position, and the wiping range is expanded. Therefore, it is more difficult to generate an unwiped area in the entire area of the windshield glass surface.

  FIG. 1 is a perspective view showing the overall configuration of a vehicle wiper device 10 according to an embodiment of the present invention. FIG. 2 is a plan view showing the configuration of the vehicle wiper device 10, and FIG. 3 is a front view showing the configuration of the vehicle wiper device 10.

  The vehicle wiper device 10 includes a first wiper 12 and a second wiper 14.

  The first wiper 12 includes a first pivot shaft 16 and a driven shaft 18. The first pivot shaft 16 is rotatably supported by a first pivot holder 22 provided on one side of the frame member 20 (the paper surface side in FIG. 2, that is, the vehicle upper side, FIG. 3 paper upper side). Yes. The first pivot holder 22 is formed in a cylindrical shape, and the first pivot shaft 16 is inserted therethrough and rotatably supported. The lower end portion (base end portion) of the first pivot shaft 16 passes through the frame member 20 and is on the other side of the frame member 20 (the back side of the page in FIG. 2, that is, the lower side of the vehicle, the lower side of the page of FIG. 3). The pivot lever 24 is fixed to the base end portion. For this reason, the first pivot shaft 16 is rotated by the swinging of the pivot lever 24.

  The driven shaft 18 is rotatably supported by a driven shaft holder 26 provided on one side of the same frame member 20 as the first pivot shaft 16 and spaced from the first pivot shaft 16 by a predetermined distance. .

  One end of the main lever 28 is integrally connected and fixed to the first pivot shaft 16 and always rotates together with the first pivot shaft 16. Further, one end of the sub lever 30 is integrally connected and fixed to the driven shaft 18 and always rotates together with the driven shaft 18. The frame member 20 between the first pivot shaft 16 and the driven shaft 18 forms a stationary link. Further, the main lever 28 and the sub-lever 30 are arranged in parallel with each other, and the arm head 34 of the first wiper 12 is rotatably connected to the tip of the main lever 28 by a main lever connecting shaft 32. In addition, the arm head 34 is rotatably connected to the distal end portion of the sub lever 30 by a sub lever connecting shaft 36.

  A retainer 38 constituting the wiper arm 12A of the first wiper 12 is connected to the distal end portion of the arm head 34 via a support shaft 40 so as to be rotatable by a predetermined angle in a direction approaching and separating from the windshield glass. Further, a spring (not shown) is spanned between the retainer 38 and the arm head 34, and always urges the retainer 38 toward the wiping surface of the windshield glass. Further, an arm piece 42 that constitutes the wiper arm 12 </ b> A of the first wiper 12 together with the retainer 38 is fixed to the distal end portion of the retainer 38. The distal end portion of the arm piece 42 is bent into a substantially U shape to form a holding portion 44, and the wiper blade 12B of the first wiper 12 is connected and held via a clip member (not shown).

  As described above, the first wiper 12 is a four-bar link type, and when the main lever 28 rotates together with the first pivot shaft 16, the arm head 34 to which the sub lever 30 is connected is moved relative to the first pivot shaft 16. As a result, the wiper arm 12 </ b> A is rotated while being brought into and out of contact with each other.

  On the other hand, the second wiper 14 includes a second pivot shaft 46. The second pivot shaft 46 is rotatably supported by the second pivot holder 48, and the flange portion 50 is provided integrally with the second pivot holder 48. Further, the flange portion 50 is integrally connected to the frame member 20 by a connecting frame 52. As described above, in the vehicle wiper device 10, the first pivot holder 22 that supports the first pivot shaft 16 and the second pivot holder 48 that supports the second pivot shaft 46 serve as a support base of the wiper motor 66 described later. The frame member 20 and the connecting frame 52 are integrated with each other so-called a frame-integrated configuration.

  Furthermore, the lower end portion (base end portion) of the second pivot shaft 46 is provided so as to protrude through the flange portion 50 to the other side of the flange portion 50, and the pivot lever 54 is fixed to the base end portion. Yes. For this reason, the second pivot shaft 46 is rotated by the swing of the pivot lever 54.

  Further, the second arm head 56 of the second wiper 14 is connected and fixed to the second pivot shaft 46. At the distal end of the second arm head 56, like the first wiper 12, the retainer 58 constituting the wiper arm 14A of the second wiper 14 is rotatable by a predetermined angle in a direction approaching and separating from the windshield glass. It is connected via a support shaft 60. Further, a spring (not shown) is spanned between the retainer 58 and the second arm head 56, and always urges the retainer 58 toward the wiping surface of the windshield glass. Further, an arm piece 62 that constitutes the wiper arm 14 </ b> A of the second wiper 14 together with the retainer 58 is fixed to the distal end portion of the retainer 58. The distal end portion of the arm piece 62 is bent into a substantially U shape to form a holding portion 64, and the wiper blade 14B is connected and held via a clip member (not shown).

  Further, a wiper motor 66 as a drive source is attached to the frame member 20. The wiper motor 66 has a configuration in which a motor portion 66A and a gear portion 66B are integrally provided, and is disposed between the first pivot shaft 16 and the driven shaft 18 on the one side of the frame member 20. The plurality of mounting legs 68 provided on the housing of the gear portion 66B are in close contact with and directly contact with the frame member 20, and in this state, are fastened and fixed by bolts and nuts (not shown).

  Further, the output shaft 70 of the wiper motor 66 is provided between the first pivot shaft 16 and the driven shaft 18 so as to pass through the frame member 20 and project to the other side of the frame member 20, and the tip thereof. Is attached with a crank arm 72. The crank arm 72 is connected to the first pivot shaft 16 and the second pivot shaft 46 by a link mechanism.

  That is, one end of the first link 74 disposed on the other side of the frame member 20 is connected to the tip of the crank arm 72 via the ball joint 76. The other end of the first link 74 is connected to a pivot lever 54 fixed to the second pivot shaft 46 via a ball joint 78. As a result, the wiper motor 66 is operated and the crank arm 72 is rotated, whereby the driving force is transmitted through the first link 74 and the pivot lever 54, and the second pivot shaft 46 is reciprocally rotated.

  Further, the pivot lever 54 fixed to the second pivot shaft 46 has one end portion of the second link 80 disposed on the other side of the frame member 20 via the ball joint 82, as in the first link 74. Are connected. The other end of the second link 80 is connected to the pivot lever 24 fixed to the first pivot shaft 16 via a ball joint 84. Accordingly, when the pivot lever 54 is rotated by the operation of the wiper motor 66, the driving force is transmitted through the second link 80 and the pivot lever 24, and the first pivot shaft 16 is reciprocally rotated.

  A plurality of attachment holes 86 are respectively formed in the frame member 20 and the flange portion 50 of the second pivot holder 48 configured as described above. Rubber grommets 88 are attached to these attachment holes 86, and the wiper device 10 is fixed to the vehicle body by attachment bolts (not shown) inserted through the rubber grommets 88. That is, each rubber grommet 88 supports the vehicle wiper device 10 in a floating manner with respect to the vehicle body.

  Next, the operation of this embodiment will be described.

  In the vehicle wiper device 10 having the above configuration, when the wiper motor 66 is driven, the second pivot shaft 46 is driven by being transmitted to the pivot lever 54 via the crank arm 72 and the first link 74 fixed to the output shaft 70. The second wiper 14 (the wiper arm 14A and the wiper blade 14B) is reciprocally rotated.

  At the same time, when the second pivot shaft 46 (pivot lever 54) is driven, the driving force is transmitted to the pivot lever 24 via the second link 80 connected to the pivot lever 54, and the first pivot shaft is transmitted. 16 is driven, and the main lever 28 is rotated together with the first pivot shaft 16. When the main lever 28 is rotated, the arm head 34 is rotated while being relatively contacted and separated from the first pivot shaft 16 by the sub lever 30 that regulates the operation of the arm head 34 by following the rotation operation of the main lever 28. As a result, the first wiper 12 (the wiper arm 12A and the wiper blade 12B) is reciprocally rotated while the entire length of the wiper arm 12A expands and contracts.

  Thereby, at the predetermined wiping position, the entire length of the wiper arm 12A of the first wiper 12 is apparently extended, and the wiping range is expanded. Therefore, as compared with a wiper device provided with a general wiper arm, it is difficult to generate an unwiped area in the entire area of the windshield glass surface.

  Here, in the vehicle wiper device 10 according to the present embodiment, the wiper motor 66 is provided on one side of the frame member 20 (the first pivot shaft 16 constituting the four-bar link of the first wiper 12, the main lever 28, the driven member). Shaft 18 and the side where the sub lever 30 and the like are disposed), and the output shaft 70 is disposed between the first pivot shaft 16 and the driven shaft 18, so that most of the wiper motor 66 is the first one. This is a configuration arranged between one pivot shaft 16 and a driven shaft 18. In other words, the wiper motor 66 is attached using the space (the space between the frame member 20 and the four-bar link) between the first pivot shaft 16 and the driven shaft 18 of the frame member 20. In addition, since the output shaft 70 of the wiper motor 66 penetrates the frame member 20 and protrudes to the other side of the frame member 20 between the first pivot shaft 16 and the driven shaft 18, the link mechanism is provided with the first pivot. The shaft 16 and the driven shaft 18 can be disposed without hindering the operation. Thus, the space occupied by the wiper motor 66, that is, the space occupied by the wiper device along the axial direction of the first pivot shaft 16 and the driven shaft 18 (from one surface of the frame member 20 to the other surface), Significantly smaller. Therefore, as in the prior art, the frame member 20 is formed to extend further to the outside between the shafts (outside in the longitudinal direction of the apparatus) separately from the portion constituting the immovable link between the first pivot shaft 16 and the driven shaft 18. The frame member 20 and the entire apparatus can be reduced in size and weight without using a large frame member, and it is not necessary to secure a large apparatus mounting space. In addition, since the mold apparatus for manufacturing the frame member 20 and the like can be downsized, the manufacturing cost can be reduced.

  In addition, the first pivot shaft 16 of the first wiper 12 has a base end portion (pivot lever 24) protruding from the other side of the frame member 20, and the second link 80 is provided on the base end portion (pivot lever 24). Are connected to each other, not only the link mechanism (that is, the first link 74) that operates the second wiper 14 (second pivot shaft 46) but also the link that operates the first wiper 12 (first pivot shaft 16). Since both the mechanisms (that is, the second link 80) can be arranged together on the other side of the frame member 20, the operation occupation space necessary for the operation of the apparatus can be kept small, and the apparatus is configured compactly as a whole. can do.

  Furthermore, in general, when the rotational motion of the wiper motor is converted into a reciprocating swing motion via a link mechanism, if the distance between the output shaft of the wiper motor and the pivot shaft connected thereto is short, the rotational speed fluctuation of the pivot shaft increases. End up.

  In this respect, in the vehicle wiper device 10 according to the present embodiment, as described above, the output shaft 70 of the wiper motor 66 passes through the frame member 20 and the frame member 20 between the first pivot shaft 16 and the driven shaft 18 is moved. Further, the first link 74 that connects the output shaft 70 of the wiper motor 66 and the second pivot shaft 46, and the second pivot shaft 46 and the first pivot shaft 16 are connected. Since the second link 80 is configured to be disposed on the other side of the frame member 20, in other words, the link mechanism disposed on the other side of the frame member 20 first applies the driving force of the wiper motor 66 to the first link. The second pivot shaft 46 is transmitted to the second pivot shaft 46 and rotated, and the rotational force of the second pivot shaft 46 is transmitted to the first pivot shaft 16 through the second link 80, so that the first pivot shaft 16 is rotated. The distance between the output shaft 70 of the wiper motor 66 and the first pivot shaft 16 is short because it is configured to rotate in synchronization with each other, but the output shaft 70 of the wiper motor 66 and the first shaft connected to the output shaft 70 are connected thereto. A sufficiently long distance can be secured from the two pivot shaft 46. Therefore, fluctuations in the rotational speed of the first pivot shaft 16 that is synchronized with the second pivot shaft 46 can be reduced.

  In the vehicle wiper device 10, the second pivot holder 48 that supports the second pivot shaft 46 is connected to the frame member 20 provided with the first pivot holder 22 that supports the first pivot shaft 16 by the connecting frame 52. Since the second pivot holder 48 (and the flange portion 50) that rotatably supports the second pivot shaft 46 is configured independently of the frame member 20, the second pivot shaft 46 is configured to be independent of the frame member 20. The pivot holder 48 (and the flange portion 50) and the frame member 20 can be separately formed as a small one. Thereby, the second pivot holder 48 (and the flange portion 50) formed in a small size is connected to the frame member 20 by the connecting frame 52 to constitute the device, whereby the entire device can be reduced in size and weight.

  Thus, in the vehicle wiper device 10 according to the present embodiment, the space occupied by the device along the axial direction of the first pivot shaft 16 and the driven shaft 18 can be reduced, and the entire device can be made compact. The weight can be reduced and the cost can be reduced, and the rotational speed variation of the first pivot shaft 16 (wiper arm 12A and wiper blade 12B) and the second pivot shaft 46 (wiper arm 14A and wiper blade 14B) can be reduced.

  Next, another embodiment of the present invention will be described.

  Note that components that are basically the same as those of the above embodiment are given the same reference numerals as those of the above embodiment, and description thereof is omitted.

  FIG. 4 is a perspective view showing the overall configuration of a vehicle wiper device 90 according to another embodiment of the present invention.

  The vehicle wiper device 90 includes a first wiper 92 and a second wiper 94.

  The first wiper 92 has the same configuration as the first wiper 12 of the vehicle wiper device 10 according to the above-described embodiment, and provides the same operational effects.

  On the other hand, the second wiper 94 includes a second pivot shaft 96. Similar to the second pivot shaft 46 of the second wiper 14 of the vehicle wiper device 10 according to the above-described embodiment, the second pivot shaft 96 is rotatably supported by the second pivot holder 97. Further, one end of the second main lever 98 is integrally connected and fixed to the second pivot shaft 96 and always reciprocates with the second pivot shaft 96.

  The second wiper 94 includes a second driven shaft 100. The second driven shaft 100 is rotatably supported by a driven shaft holder 104 provided on one side of the same flange portion 102 as the second pivot shaft 96 and spaced apart from the second pivot shaft 96 by a predetermined distance. . One end of the second sub-lever 106 is integrally connected and fixed to the second driven shaft 100 and always rotates together with the second driven shaft 100.

  The flange portion 102 between the second pivot shaft 96 and the second driven shaft 100 forms a stationary link. Further, the second main lever 98 and the second sub lever 106 are arranged in parallel with each other, and the second arm head 110 can be rotated by the second main lever connecting shaft 108 at the tip of the second main lever 98. Similarly, the second arm head 110 is rotatably connected to the distal end portion of the second sub lever 106 by a second sub lever connecting shaft 112.

  The wiper arm 94A of the second wiper 94 configured to include the second arm head 110 has the same configuration as the wiper arm 14A of the first embodiment.

  As described above, the second wiper 94 is a four-bar link type, and when the second main lever 98 is rotated together with the second pivot shaft 96, the second arm head 110 to which the second sub lever 106 is connected is The rotation of the wiper arm 94A is expanded and contracted relative to and away from the two pivot shaft 96. As a result, the entire length of the wiper arm 94A expands and contracts (the support position of the second arm head 110 is displaced and the entire length of the wiper arm 94 apparently expands and contracts).

  In the vehicle wiper device 90 according to another embodiment having the above-described configuration, when the second pivot shaft 96 is driven by the drive of the wiper motor 66, the second main lever 98 is rotated together with the second pivot shaft 96. The When the second main lever 98 rotates, the second sub-lever 106 that follows the rotation operation of the second main lever 98 and restricts the operation of the second arm head 110 causes the second arm head 110 to move to the second pivot shaft 96. As a result, the second wiper 94 is reciprocally rotated while the entire length of the wiper arm 94A is expanded and contracted.

  Thereby, not only the first wiper 92 but also the entire length of the wiper arm 94A of the second wiper 94 is apparently extended at the predetermined wiping position, and the wiping range is expanded. Therefore, it is more difficult to generate an unwiped area in the entire area of the windshield glass surface.

1 is a perspective view showing an overall configuration of a vehicle wiper device according to an embodiment of the present invention. It is a top view which shows the whole structure of the wiper apparatus for vehicles which concerns on embodiment of this invention. 1 is a front view showing an overall configuration of a vehicle wiper device according to an embodiment of the present invention. It is a perspective view which shows the whole structure of the wiper apparatus for vehicles which concerns on other embodiment of this invention.

Explanation of symbols

        10. Wiper device for vehicle, 12. First wiper, 14. Second wiper, 16. First pivot shaft, 18. Drive shaft, 20. Frame member, 28, main lever, 30.・ Sub-lever, 32 ・ ・ Main lever connecting shaft, 34 ・ ・ Arm head, 36 ・ ・ Sub-lever connecting shaft, 46 ・ ・ Second pivot shaft, 52 ・ ・ Connecting frame, 66 ・ ・ Wiper motor, 70 ・ ・ Output shaft, 74・ ・ First link (link mechanism), 80 ・ ・ Second link (link mechanism)

Claims (5)

The wiper has a plurality of wipers including at least a first wiper and a second wiper, and each wiper wipes the wiping surface in synchronization with each other by a link mechanism operated by a wiper motor, and at least the first wiper among the plurality of wipers. In the vehicle wiper device that is swung by expanding the wiping range by being rotated by the four-bar link,
The four-bar link of the first wiper includes a first pivot shaft rotatably supported on one side of a frame member, a main lever fixed to the first pivot shaft and rotated together with the first pivot shaft. A driven shaft that is rotatably supported at a predetermined distance from the first pivot shaft on one side of the frame member that is the same as the first pivot shaft, a sub-lever that rotates together with the driven shaft, and the main lever An arm head that is rotatably connected through a main lever connecting shaft and an end of the sub lever that is rotatably connected through a sub lever connecting shaft.
The wiper motor is attached to the frame member, and a part of the output shaft in the axial direction is disposed on the one side of the frame member and between the first pivot shaft and the driven shaft, and The other part of the output shaft is disposed on the other side of the frame member,
A vehicle wiper device. The wiper motor is disposed on one side of the frame member, and the distal end side of the output shaft protrudes to the other side of the frame member,
The link mechanism includes a first link arranged on the other side of the frame member and connecting a second pivot shaft to which the second wiper is fixed and an output shaft of the wiper motor, and on the other side of the frame member. A second link disposed and connecting the second pivot shaft and the first pivot shaft.
The vehicle wiper device according to claim 1. A pivot holder that rotatably supports the second pivot shaft of the second wiper is disposed on the opposite side of the wiper motor with respect to the first pivot shaft, and is coupled to the frame member by a coupling frame.
The vehicle wiper device according to claim 2. The first pivot shaft of the first wiper is provided with a base end portion protruding from the other side of the frame member, and the second link is connected to the base end portion.
The vehicle wiper device according to claim 2 or claim 3, wherein The second wiper is fixed to the second pivot shaft and rotates together with the second pivot shaft. The second wiper rotates at a predetermined distance from the second pivot shaft on the same side as the second pivot shaft. A second driven shaft that is movably supported, a second sub-lever that rotates together with the second driven shaft, and a tip portion of the second main lever are rotatably connected via a second main lever connecting shaft. And a second arm head having a tip end portion of the second sub-lever rotatably connected via a second sub-lever connecting shaft.
The vehicle wiper device according to any one of claims 1 to 4, wherein the vehicle wiper device is provided.

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