JPH0627388U - Car wiper device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vehicle wiper device having a presser foot pressure varying mechanism, it is possible to automatically perform a lockback operation of a wiper blade during parking. A wiper arm 1 including a first arm 2 to which a driving force is input and a second arm 3 hingedly connected to a tip end portion of the first arm 2 via a connecting pin 4 and having a wiper blade. Between the first arm 2 and the second arm 3, a holding pressure varying mechanism 50 for varying the holding pressure of the wiper blade against the windshield surface is provided, and the holding pressure varying mechanism 50 is controlled according to the vehicle speed. In the above-described automobile wiper device, the presser foot pressure varying mechanism 50 is provided with the lockback means 51 for generating a negative presser footer pressure so as to separate the wiper blade from the windshield surface during parking.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automobile wiper device in which the pressing pressure of the wiper blade against the windshield surface is variable.

[0002]

[Prior art]

 In the past, in the case of automobile wiper devices, in view of the fact that as the traveling speed of the automobile increases, the pressure of the wiper blade against the windshield surface tends to decrease due to the influence of wind pressure, impeding good wiping action. By gradually increasing the pressing pressure of the wiper blade against the windshield surface as the vehicle speed increases, a proper wiping action is achieved by always ensuring an appropriate pressing pressure regardless of the driving speed. The idea of doing so is known (see, for example, Japanese Patent Application Laid-Open No. 1-132446).

[0003]

[Problems to be solved by the device]

 By the way, even with a wiper device equipped with such a mechanism for adjusting the pressing pressure, when the wiper is not used, a person intentionally lifts the wiper blade from the window glass surface and holds it in a non-contact state. Unless a so-called lock back operation is performed, the wiper blade is always kept pressed against the windshield surface with a predetermined pressing pressure.

However, when the wiper blade is constantly pressed against the windshield surface with a predetermined pressing pressure even when the wiper is not used, especially when the vehicle is parked, the wiper blade is permanently deformed, for example. The wiping performance may be deteriorated, and in winter, the wiper blade may be unusable because it may freeze on the windshield surface or be buried in the snow on the windshield surface. It is also possible to perform a lockback operation when getting off the vehicle in order to avoid such an inconvenience, but in this case, the operation is troublesome because the wiper blade is lifted by hand as described above. , Especially in the cold of winter, it tends to be troublesome.

In view of the above, the present invention provides a wiper device for an automobile equipped with a presser foot pressure varying mechanism, by making good use of the presser foot pressure varying mechanism, so that the wiper blade can be automatically locked back during parking. Therefore, the purpose was to suppress permanent deformation of the wiper blade.

[0006]

[Means for Solving the Problems]

 As a concrete means for solving such a problem in the present invention, in the invention according to claim 1, the first arm to which the driving force is inputted and the tip end portion of the first arm are hinge-coupled via a connecting pin. A presser foot pressure varying mechanism is provided between the first arm and the second arm of a wiper arm including a second arm provided with a wiper blade, and the presser foot pressure varying mechanism for varying the pressurizing pressure of the wiper blade against the windshield surface. In addition, in a vehicle wiper device in which the presser foot pressure varying mechanism is controlled in accordance with the vehicle speed, the presser foot pressure varying mechanism causes the negative presser foot to separate the wiper blade from the windshield surface during parking. The feature is that a lockback means for generating pressure is provided.

According to a second aspect of the present invention, in the vehicle wiper device according to the first aspect, the above-described presser foot pressure varying mechanism urges the second arm to rotate around the connecting pin toward the windshield surface. And a moment arm adjusting member for increasing or decreasing the size of the moment arm around the connecting pin by the urging member, and the rock-back means functions as the moment arm adjusting means. It is characterized in that the urging force operating line can be moved to the side opposite to the windshield surface with the hinge joint portion as a consideration point.

[0008]

[Action]

 With each of the inventions of the present application, the following actions can be obtained with such a configuration.

According to the first aspect of the present invention, since the wiper blade is separated from the windshield surface by the lockback means during parking, the troublesome operation of manually lifting the wiper blade when getting off the vehicle is released. Permanent deformation of the wiper blade that occurs when the wiper blade is continuously pressed against the windshield surface is suppressed, and the wiper blade wipes off the windshield surface well, while parking even in winter. This prevents the wiper blade from becoming unusable due to freezing of the wiper blade on the wind glass surface or being buried in snow on the wind glass surface.

According to the second aspect of the present invention, the pressing force of the wiper blade against the windshield surface is adjusted by increasing or decreasing the moment of the second arm around the connecting pin according to the vehicle speed using the moment arm adjusting means. On the other hand, the moment arm adjusting means is used to move the urging force action line of the urging member from the point of consideration to the side opposite to the windshield surface, whereby the wiper blade is separated from the windshield surface and the lockback operation is realized. It is something.

[0011]

[Effect of device]

 Therefore, according to the automobile wiper device of each invention of the present application, the following effects can be obtained.

According to the vehicle wiper device of the first aspect, since the lockback operation of the wiper device is automatically performed during parking, the lockback operation can be further facilitated and its operability is improved. In addition to the dramatic improvement, it is possible to obtain the effect that the durability of the wiper blade can be improved or the function can be maintained by suppressing the permanent deformation.

According to the automobile wiper device of the second aspect, since the lock-back operation is performed by using the moment arm adjusting means of the presser foot pressure varying mechanism, the above-mentioned configuration is simpler. The effect can be obtained.

[0014]

【Example】

 Hereinafter, a vehicle wiper device of the present invention will be described in detail based on an embodiment. FIG. 1 shows a main part of an automobile wiper device according to the embodiment of the present invention. 1 is a wiper arm. The wiper arm 1 includes a first arm 2 whose base end 2a is fixed to a pivot shaft 5 and a driving force is input through the pivot shaft 5, and a base end of the wiper arm 1 at a tip 2b of the first arm 2. The portion 3a is hinged via a connecting pin 4 so as to be rotatable in a direction (arrow E-F direction) substantially orthogonal to a window glass surface (not shown), and the window glass surface is wiped off at its tip side. It has the 2nd arm 3 provided with the oper blade (illustration omitted).

The pivot shaft 5 supporting the base end portion 2a of the first arm 2 is rotatably supported by a cylindrical bearing 7 fixed to the vehicle body member 30, and the pivot lever 6 attached to the lower end portion of the pivot bearing 6 is supported. A driving force is input from a wiper drive motor (not shown) through the wiper arm 1 to rotate the wiper arm 1 along the windshield surface in the direction of arrow A-B within a predetermined angle range to move the wiper blade. Then, the required wiping action is performed.

Further, the pressing pressure of the wiper blade against the windshield surface corresponds to the spring 20 arranged between the first arm 2 and the second arm 3 (corresponding to the biasing member within the scope of the utility model registration claim). ), The presser foot pressure can be adjusted according to the vehicle speed, and a lockback operation for separating the wiper blade from the windshield surface can be performed when the vehicle is parked. In order to make it automatically performed, a new configuration as described later is adopted.

That is, as shown in FIG. 1, a swing lever 21 (corresponding to a moment arm adjusting member in the scope of claims for utility model registration) is provided on the side of the first arm 2 via a pivot pin 22. The second arm 3 is rotatably supported in the same direction as the rotation direction (arrow C-D direction), and one end 21a of the swing lever 21 is connected to one end of the spring 20 via a connecting member 26. So that the urging force acting line of the spring 20 can be brought into contact with and separated from the connecting pin 4 in accordance with the rotation of the swing lever 21, and thus the second arm 3 can be moved around the connecting pin 4 times. By increasing or decreasing the size of the moment arm, the pressing pressure of the wiper blade against the windshield surface can be controlled.

Incidentally. In this case, since the connecting pin 4 is a consideration point in the rotation direction of the second arm 3, in the presser foot pressure variable control, the urging force acting line is located on the window glass side of the connecting pin 4. The shape of the guide surface 14 of the guide member 13 to be described later is set so as to be within a range, that is, within the range of the action line L ₁ to the action line L ₂ in FIG.

Further, when the oscillating lever 21 rotates in the direction of arrow D, the line of action of the urging force of the spring 20 exceeds the line of action L ₂ and moves to the side opposite to the windshield surface (line of action L ₃ ). The second arm 3 is rotated by receiving a biasing force in a direction away from the windshield surface (direction of arrow E), and is brought into contact with the second stopper 32 provided on the first arm 2 side on the second arm 3 side. By contacting the portion 33, the posture is maintained in a state of being flipped up from the wind glass surface (state shown by a chain line in FIG. 1). This state is a state in which the wiper blade receives a negative pressing pressure and is separated from the windshield surface, and this state is hereinafter referred to as a lockback state.

In this lockback state, as shown by the chain line in FIG. 1, the upper surface of one end 21a of the rocking lever 21 comes into contact with the first stopper 31 provided on the first arm 2 side, and Further rotation of the second arm 3 is restricted. That is, the posture of the second arm 3 in the lockback state is maintained by both the second stopper 32 side and the first stopper 31 side, but the former regulation is mainly the swing lever. This is for the case where a person manually sets the second arm 3 to the lockback state without depending on 21. The latter regulation is mainly to automatically set the swing lever 21 to the lockback state as described later. This is for the purpose of each case, and each has a different purpose of use.

On the other hand, an engaging member 23 is formed on the other end 21b of the swing lever 21 (see FIGS. 1 and 3), and the engaging member 23 engages with a guide surface 14 of a guide member 13 described later. By doing so, the swing lever 21 is appropriately rotated.

As shown in FIGS. 1 to 3, the guide member 13 is composed of a cylindrical body rotatably fitted and disposed on the upper portion of the pivot shaft 5, and has an outer peripheral surface on the outer peripheral surface thereof. As shown in FIGS. 3 and 4, the curved guide surface 14 is formed with the surface direction facing downward, and the engaging projection is formed on the inner peripheral surface of the recess 17 formed at the lower end side thereof. 15 are formed. The engaging member 23 of the rocking lever 21 is engaged with the guide surface 14 of the guide member 13 from the lower side, and the engaging member 23 is denoted by reference numerals 23A to 23C in FIG. The rocking lever 21 is gradually rotated in the direction of arrow C by sequentially shifting from the high position to the low position, and the moment arm with respect to the second arm 3 is gradually increased to hold down the wiper blade against the windshield surface. Acts to increase pressure. Further, in a state in which the engaging element 23 corresponds to the lowest portion of the guide surface 14 as indicated by the reference numeral 23D, the swing lever 21 is rotated to the greatest extent in the direction of arrow C (see FIG. 1) and the above-mentioned second The arm 3 can be set in the lockback state.

As described above, in the guide member 13, when the engaging member 23 moves from the position of 23A to the position of 23C as the vehicle speed shifts from the high speed to the low speed, and when the vehicle is in the parking state. Need only be controlled in its rotational position so as to move to the position of 23D. In this embodiment, the rotation control of the guide member 13 is controlled by the control unit 40 (see FIG. 6) which will be described later. The control motor 11 is appropriately controlled and its rotational force is transmitted to the guide member 13 via a sleeve 9 described later. When the engaging element 23 is located within the range of reference numerals 23A to 23C in FIG. 4, the urging force of the spring 20 acts on the engaging element 23 in the direction of pressing it toward the guide surface 14 side. However, when the engaging element 23 is in the position of 23D, a biasing force acts on the engaging element 23 in the direction of separating it from the guide surface 14, but in the latter case, as described above. Since the rotation of the rocking lever 21 is restricted by the first stopper 31 on the first arm 2 side, no trouble occurs in the operation.

As shown in FIGS. 1 to 3, the sleeve 9 is integrally formed of a long tubular body having a worm wheel 10 formed on the outer peripheral surface on the lower end side thereof, and is positioned below the guide member 13. It is rotatably fitted and disposed on the pivot shaft 5. The upper end 9a of the sleeve 9 has a diameter dimension that allows it to be loosely fitted in the recess 17 of the guide member 13, and a notch opening 16 is formed on one side thereof at an angle θ. When the upper end 9a of the sleeve 9 is fitted in the recess 17 of the guide member 13, the engaging projection 15 is engaged in the cutout opening 16, and the guide member 13 is engaged. The mating projection 15 is relatively rotatable within a range where it engages with both end surfaces 16a, 16b of the cutout opening 16. The rotatable range of the guide member 13 is the arc rotation range of the wiper arm 1 during wiping. A worm wheel 12 of the sleeve 9 is meshed with a worm gear 12 which is rotationally driven by a holding pressure control motor 11 arranged on the cylindrical bearing 7 side.

Therefore, when the wiper arm 1 is rotated integrally with the pivot shaft 5 to wipe the windshield surface by wiping the wiper blade, the guide member 13 is provided with the cutout opening of the sleeve 9 described above. Since the arc rotation is allowed by 16 and the frictional force acts between the engaging element 23 of the rocking lever 21 that abuts on the guide surface 14, the rocking lever is moved. 21 and the wiper arm 1 are rotated together with the wiper arm 1. On the other hand, when the sleeve 9 is rotated, the above-mentioned engagement projection 15 engages with the end surface 16a or 16b of the cutout opening 16 so that the guide member 13 is rotated by the sleeve 9 and the above-mentioned rocking motion occurs. The relative position with the moving lever 21 is changed (that is, the engagement element 23 moves on the guide surface 14 within the range of the reference numerals 23A to 23D as shown in FIG. 4). As a result, a wiping action of the wiper arm 1, a holding pressure adjusting action corresponding to the vehicle speed, and a lockback action of the wiper arm 1 during parking are realized.

Next, control for performing each of the above-described actions will be described. FIG. 6 shows the configuration of the control system of this wiper device. That is, in this embodiment, as described above, the normal wiping action controls the wiper drive motor 45, and the presser pressure adjusting action and the lockback operation control the presser pressure control motor 11 respectively. The operation is controlled by the unit 40. Therefore, an ignition key switch signal 41, a vehicle speed signal 42, a wiper switch signal 43, and an automatic stop position signal 44 are input to the control unit 40 as control factor signals. It has become so. The automatic stop signal 44 is a signal for determining whether or not the wiper arm 1 is set to the initial position (storage position) when the wiping operation with the wiper switch is released. This is a type of interlock mechanism that is provided to avoid this, because if the lockback control is performed when the initial position is not set, the device may be damaged.

Next, the actual wiper control will be specifically described with reference to the flowchart shown in FIG. 5. First, after the control is started, it is determined whether the ignition key switch is ON or OFF (step S1). . Here, when it is determined to be ON (that is, when the vehicle is not parked), the normal wiper control is performed. That is, in step S2, it is determined whether the wiper switch is ON or OFF. If the wiper switch is ON, the wiper drive motor 45 is controlled according to the selected mode (for example, LOW mode, HIGH mode, INT mode). The wiping operation is performed (step S3). At the same time, the pressing pressure control motor 11 is controlled according to the current vehicle speed, and the guide member 13 is appropriately rotated to secure the pressing pressure corresponding to the vehicle speed (step S4). This ensures a proper pressing pressure at all times regardless of the vehicle speed (in other words, regardless of the size of the traveling wind applied to the wiper blade) and achieves a good wiping action.

The wiping control and the presser foot pressure control are continued until the wiper switch is set to OFF or the ignition key switch is set to OFF. When the wiper switch is set to OFF, the wiper arm 1 Regardless of the operating position, it is operated to the automatic stop position and stopped there (step S6). When the ignition key switch is set to OFF, the control shifts to lockback control described later.

On the other hand, if it is determined in step S1 that the ignition key switch is OFF, the vehicle speed is determined next (step S4), and when the vehicle speed becomes 0 (that is, the vehicle is completely stopped and parked). When it is confirmed that the above condition exists, the wiper switch is judged to be ON-OFF (step S8). Note that the ON / OFF judgment of the wiper switch is made here even if the wiper switch is set to ON, because the ignition key switch is already in the OFF state, but the wiper does not perform the wiping operation. This is because the wiper arm 1 must be set to the automatic stop position in order to perform the back control. Therefore, whether the wiper switch is ON or OFF is determined whether or not it is currently in the automatic stop position (steps S10, 11), and when it is in the automatic stop position, the presser foot pressure control motor 11 is turned on. The second arm 3 is operated so that the engagement element 23 corresponds to the position 23D in FIG. 4, and the second arm 3 is separated from the windshield surface side. This completes the lockback operation.

Therefore, the driver can leave the vehicle as it is without having to manually perform the lockback operation after getting off the vehicle. When the lockback operation is performed in this way, the wiper blade is separated from the windshield surface, so that the permanent deformation of the wiper blade can be suppressed and the windshield blade surface can be prevented even during winter, especially during parking. It is possible to surely prevent freezing of the snow and being buried in the snow on the windshield surface. Further, when the lock-back operation is performed using the presser foot pressure varying mechanism as in this embodiment, the number of dedicated members and the like can be reduced, and the structure can be simplified accordingly, resulting in lower cost. Thus, it is possible to provide a wiper device with a lockback mechanism.

In this embodiment, the swing lever 21, the guide member 13, the sleeve 9 and the presser pressure control motor 11 are used to form the presser foot pressure varying mechanism 50 and the lockback means 51 within the scope of the utility model registration claim. It is configured.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an automobile wiper device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an exploded perspective view of the sleeve and the guide member shown in FIG.

4 is a development view of a guide surface of the guide member shown in FIG.

5 is a control flowchart of the automobile wiper device shown in FIG. 1. FIG.

FIG. 6 is a system configuration diagram of the automobile wiper device shown in FIG. 1.

[Explanation of symbols]

1 is a wiper arm, 2 is a first arm, 3 is a second arm, 4 is a connecting pin, 5 is a pivot shaft, 6 is a pivot lever, 7 is a cylindrical bearing, 9 is a sleeve, 10 is a worm wheel, 11 is a presser foot pressure. Control motor, 12 is a worm gear,
13 is a guide member, 14 is a guide surface, 15 is an engagement protrusion,
16 is a notch opening, 20 is a spring, 21 is a rocking lever, 22 is a pivot pin, 23 is an engaging element, 26 is a connecting member,
27 is a door hinge, 30 is a vehicle body member, 31 is a first stopper, 32 is a second stopper, 33 is an abutting portion, 40 is a control unit, 50 is a pressing pressure variable mechanism, 51 is a lockback means, L _{1 to} L ₃ Is the line of action of biasing force.

Claims (2)

[Scope of utility model registration request] 1. A first arm to which a driving force is input and the first arm
Between the first arm and the second arm of the wiper arm, which is hinged to the tip of the arm via a connecting pin and has a second arm having a wiper blade, the windshield surface of the wiper blade is provided. A presser wiper device for an automobile, in which a presser foot pressure varying mechanism for varying the presser foot pressure is provided, and the presser foot pressure varying mechanism is controlled according to the vehicle speed. A wiper device for an automobile, comprising lockback means for generating a negative pressing pressure so as to separate the wiper blade from the windshield surface. 2. The pressing pressure variable mechanism according to claim 1, wherein a biasing member that biases the second arm to rotate toward the windshield surface around the connecting pin and a connecting pin around the biasing member. A moment arm adjusting member for increasing or decreasing the size of the moment arm, and the lockback means functions as the moment arm adjusting means so that the urging force action line of the urging member is the hinge coupling portion as a consideration. A wiper device for an automobile, characterized in that the wiper device can be moved to the side opposite to the windshield surface.