JP2017088132A - Wiper unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper unit which achieves a small arrangement space and inhibits an impact exerted on a colliding object.SOLUTION: A wiper unit U includes: a wiper motor M; a frame member 12 to which the wiper motor M is fixed; and a pivot holder 11 having a holder part 11a which holds a pivot shaft 13 in which a wiper W is connected to an upper end part, a frame fixing part 11c extending from the holder part 11a and fixed to the frame member 12, and a holder vehicle body fixing part 11b extending from the holder part 11a and used to fix the wiper unit U to the vehicle body. A fragile part 11f is provided at an extension part 11e between the holder part 11a and the frame fixing part 11c in the pivot holder 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wiper unit.

  Conventionally, a vehicle is provided with a wiper unit. The wiper unit includes a wiper motor, a rod-like member to which the wiper motor is fixed, and pivot holders fixed to both ends of the rod-like member. And as a pivot holder, it has a holder part holding the pivot axis | shaft with which a wiper is connected to an upper end, and a holder vehicle body fixing | fixed part extended from this holder part and being fixed with respect to a vehicle body, a holder part and a holder vehicle body There is one in which a fragile portion is provided between the fixed portion (for example, see Patent Document 1). In such a wiper unit, for example, when an external force (impact) downward in the axial direction is applied to the pivot shaft (base end portion of the wiper) due to collision of some object, the fragile portion is broken while the pivot shaft and the holder portion are broken. Further, since the integrated object composed of the rod-shaped member and the wiper motor is displaced (dropped) downward, it is possible to suppress an impact (reaction force from the pivot shaft) applied to the object.

JP 2004-330895 A

  However, in the wiper unit as described above, a large arrangement space is required on the vehicle side in order to allow a large unit consisting of a pivot shaft, a holder portion, a rod-shaped member, a wiper motor, and the like to be displaced downward. There is a problem of end.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a wiper unit that can suppress an impact applied to a colliding object while keeping a small arrangement space.

  A wiper unit that solves the above problems includes a wiper motor, a rod-like member to which the wiper motor is fixed, a holder portion that holds a pivot shaft to which the wiper is connected to an upper end portion, and extends from the holder portion and is fixed to the rod-like member. A wiper unit having a rod-shaped member fixing portion and a pivot holder having a holder vehicle body fixing portion extending from the holder portion and fixed to the vehicle body, wherein the holder portion and the rod shape in the pivot holder A weak part is provided in the extension part between the member fixing parts.

  According to this configuration, the extending portion between the holder portion and the rod-shaped member fixing portion in the pivot holder is provided with the weak portion, and thus, for example, an external force downward in the axial direction is applied to the pivot shaft due to the collision of some object. In this case, even if there is no space below the wiper motor or the rod-like member, the pivot shaft and the holder portion can be displaced downward while the fragile portion is broken. Therefore, the impact applied to the object can be suppressed while the space is small.

  In the wiper unit, the extending portion includes a side extending portion that extends from the holder portion along the direction orthogonal to the axis of the pivot shaft, and a rod-like shape that extends downward from the tip of the side extending portion. Preferably, the weakened portion is provided in the laterally extending portion. The vertically extending portion is connected to the member fixing portion.

  According to this configuration, the extending portion extends from the holder portion along the direction orthogonal to the axis of the pivot shaft, and extends downward from the tip of the side extending portion and is connected to the rod-shaped member fixing portion. Since the fragile portion is provided in the lateral extension portion, for example, a space below the fragile portion, and thus a large amount of displacement downward of the pivot shaft and the holder portion can be secured. It becomes easy. That is, when an external downward force is applied to the pivot shaft due to some object collision, the fragile portion breaks and the pivot shaft and the holder portion are displaced downward while rotating around the holder body fixing portion. When the position is as high as possible, the downward displacement of the pivot shaft and the holder part can be increased. In the above configuration, the fragile portion is provided in a laterally extending portion extending from the holder portion along the direction orthogonal to the axis of the pivot shaft. For example, the fragile portion is in the middle when the extending portion extends obliquely. Compared with the case where it is provided, since the position of the fragile portion can be made higher, the downward displacement amount of the pivot shaft and the holder portion can be increased.

In the wiper unit, a vehicle body side extending portion between the holder portion and the holder vehicle body fixing portion and the vertical extending portion are preferably L-shaped in cross section.
According to this configuration, the vehicle body side extending portion between the holder portion and the holder vehicle body fixing portion and the vertical extending portion have an L-shaped cross-sectional shape. The rigidity of the direction extension part can be increased, and for example, the weak part (side extension part) can be formed into a simple plate shape having a rectangular cross section.

  In the wiper unit, a swing lever capable of rotating integrally with the pivot shaft and capable of inputting and outputting power is provided at a lower end of the pivot shaft, and the vertically extending portion is configured to swing the swing lever. It is preferable to have an L-shaped cross-sectional shape by having a rib extending on the base end side of the lateral extension portion at an end portion far from the moving range.

  According to the same configuration, the vertically extending portion has the rib extending to the proximal end side of the side extending portion at the end far from the swinging range of the swing lever provided at the lower end of the pivot shaft. Thus, since the L-shaped cross section is formed, it is possible to prevent the rib from narrowing the swing range of the swing lever while increasing the rigidity of the vertically extending portion.

  In the wiper unit, a swing lever capable of rotating integrally with the pivot shaft and capable of inputting and outputting power is provided at a lower end of the pivot shaft, and a vehicle body between the holder portion and the holder vehicle body fixing portion is provided. The side extending portion preferably has an L-shaped cross section by having a rib extending downward at an end portion on the side far from the swing range of the swing lever.

  According to this configuration, the vehicle body side extending portion between the holder portion and the holder vehicle body fixing portion extends downward to the end portion far from the swing range of the swing lever provided at the lower end of the pivot shaft. Since the rib has an L-shaped cross-sectional shape, it is possible to prevent the rib from narrowing the swing range of the swing lever while increasing the rigidity of the vehicle body extending portion.

In the wiper unit, it is preferable that the holder vehicle body fixing portion is fixed to a vehicle body via a rubber bushing.
According to this configuration, the holder vehicle body fixing portion is fixed with the rubber bush and can be fixed to the vehicle body via the rubber bush, so that propagation of vibration is suppressed between the wiper unit and the vehicle body. Also, when an axial downward force is applied to the pivot shaft due to some object collision, if the fragile portion breaks, the rubber bush is elastically deformed so that the pivot shaft and the holder portion can be easily rotated around the holder body fixing portion. It is allowed to move, and the pivot shaft and the holder part can be displaced downward. Therefore, it is possible to suppress the impact applied to the object, including absorbing the impact when the rubber bush is elastically deformed.

  In the wiper unit of the present invention, it is possible to suppress an impact applied to a colliding object while reducing a small arrangement space.

The perspective view of the wiper unit in one embodiment. The side view of the wiper unit in one Embodiment. (A) is sectional drawing along the AA in FIG. (B) is sectional drawing along the BB line in FIG. (C) is sectional drawing along CC line in FIG. The schematic diagram for demonstrating the effect | action of the wiper unit in one Embodiment.

Hereinafter, an embodiment of a wiper unit for a vehicle will be described with reference to FIGS.
As shown in FIG. 1, the wiper unit U includes two pivot holders 11, a frame member 12 as a rod-shaped member, a wiper motor M, and two link rods R1 and R2.

  The frame member 12 has a U-shaped cross-sectional shape orthogonal to the longitudinal direction (a cross-sectional shape is defined by a pair of opposing surfaces opposing the axis L1 direction of the pivot shaft 13 and a back plate surface connecting the pair of opposing surfaces. The pivot holder 11 is fixed to both ends in the longitudinal direction, and the wiper motor M is fixed to the middle portion in the longitudinal direction. Each pivot holder 11 includes a substantially cylindrical holder portion 11a that rotatably holds a pivot shaft 13 to which a wiper W is connected to an upper end portion thereof, and extends radially outward from a part of the outer peripheral portion of the holder portion 11a. And a frame fixing portion 11c as a rod-like member fixing portion which is a part of the outer peripheral portion of the holder portion 11a and extends from the opposite side of the holder vehicle body fixing portion 11b. The holder body fixing portion 11b has a fixing hole that penetrates in the direction along the axis L1 direction of the pivot shaft 13, and a rubber bush 14 is attached and fixed to the fixing hole, and a bolt that penetrates the rubber bush 14 and the fixing hole. It will be fixed to the vehicle body by such means. Each frame fixing portion 11c extends along the longitudinal direction of the frame member 12, and has a positioning protrusion 11d fitted into the positioning hole 12a of the frame member 12 on the tip side as shown in FIG. The frame fixing portion 11c is threaded by a screw 15 that passes through the back plate surface of the frame member 12 (to the base end side of the frame fixing portion 11c) with the positioning protrusion 11d fitted into the positioning hole 12a. It is fixed to the frame member 12. A swing lever 13a extending in a direction perpendicular to the axis is fixed to the lower end of each pivot shaft 13 protruding from the lower end of the holder portion 11a.

  The wiper motor M includes a motor body 21 and a speed reduction unit 22. The motor main body 21 rotationally drives an internal rotor (not shown) by supplying a drive current from an external power source. The speed reduction part 22 is a gear housing 23 fixed to the motor body 21, a speed reduction mechanism such as a worm speed reduction gear (not shown) provided inside the gear housing 23 for reducing the rotation of the rotor, and a gear connected to the speed reduction mechanism. And an output shaft 24 protruding from the housing 23. A base end portion of a flat drive lever 25 is fixed to the distal end portion of the output shaft 24. Note that the axis L2 (see FIG. 2) of the output shaft 24 is set in a direction substantially parallel to the axis L1 of the pivot shaft 13, and in this embodiment, the direction in which the output shaft 24 and the pivot shaft 13 protrude is upward.

  The gear housing 23 is arranged in a direction perpendicular to the axis L2 of the output shaft 24 and perpendicular to the axis L3 of the rotor of the motor body 21 (in other words, the worm of the worm speed reducer housed in the gear housing 23 is disposed). A pair of mounting legs 23a (see FIG. 1) is provided on the side surface opposite to the formed side. The gear housing 23 is fastened and fixed to the frame member 12 by bolts 26 (see FIG. 2) that pass through the frame member 12 and are screwed onto nuts held by the mounting legs 23a.

  One end of the link rod R1 is connected to the tip of the swing lever 13a on one side (passenger seat side, right side in FIG. 1), and the other end (on the driver seat side, in FIG. 1). , The left side) is connected to the tip of the swing lever 13a.

  Further, one end of the link rod R2 is connected to the tip of the drive lever 25, and the other end of the link rod R2 is one of the swing levers at the intermediate portion of the link rod R1 (the right side in FIG. 1, ie, the side far from the wiper motor M). It is connected to the side close to 13a. The end portions of the link rods R1, R2 are drivingly connected via ball joints.

  Here, the weakened part 11f is provided in the extension part 11e between the said holder part 11a and the said frame fixing | fixed part 11c in the pivot holder 11 of this embodiment. In the present embodiment, one (right side in FIG. 1) and the other (left side in FIG. 1) pivot holder 11 are slightly different in size and shape, but one (right side in FIG. 1) pivot holder 11 is different. The other (left side in FIG. 1) pivot holder 11 will be described in detail, and portions having similar functions will be denoted by the same reference numerals, and detailed description thereof will be omitted.

  Specifically, the pivot holder 11 is an integrally molded product made of a metal material (for example, a die-cast molded part such as an aluminum alloy). In the pivot holder 11, the extending portion 11 e provided between the holder portion 11 a and the frame fixing portion 11 c and connecting them is a side extending from the holder portion 11 a along the direction perpendicular to the axis L 1 of the pivot shaft 13. It has an extending part 11g and a vertically extending part 11h that extends downward from the tip of the side extending part 11g and is connected to the frame fixing part 11c. And the side extension part 11g is made into the weak part 11f as a whole.

  That is, as shown in FIG. 3 (a), the vehicle body side extending portion 11j provided between the holder portion 11a and the holder vehicle body fixing portion 11b is connected along the direction orthogonal to the axis L1 of the pivot shaft 13. The cross-sectional shape orthogonal to the longitudinal direction is an L-shaped cross-sectional shape. In the present embodiment, the vehicle body side extending portion 11j has an L-shape by having a rib 11k that protrudes in the width direction orthogonal direction (downward in the present embodiment) from the width direction end of the plate-like portion serving as the base. It has a cross-sectional shape. Further, the rib 11k has a width on the side farther from the swing range Z (see FIG. 1) of the swing lever 13a (the side opposite to the swing side of the swing lever 13a) in the vehicle body side extending portion 11j. It is provided at the end of the direction.

  Moreover, as shown in FIG.3 (b), as for the said up-down direction extension part 11h, the cross-sectional shape orthogonal to the longitudinal direction (up-down direction) is L-shaped cross-sectional shape. In the present embodiment, the vertically extending portion 11h protrudes further in the width direction from the end portion in the width direction of the plate-like portion serving as the base, and is orthogonal to the width direction (in this embodiment, the side extending portion 11g). By having a rib 11m projecting to the base end side, an L-shaped cross section is formed. The rib 11m has a width on the side farther from the swing range Z (see FIG. 1) of the swing lever 13a (opposite to the swing side of the swing lever 13a) in the vertically extending portion 11h. It is provided at the end of the direction.

  And as shown in FIG.3 (c), as for the said side extension part 11g, the cross-sectional shape orthogonal to the longitudinal direction is made into a rectangular cross-sectional shape (it is a plate-shaped part used as a base), The vehicle body side extending portion 11j and the vertically extending portion 11h having the L-shaped cross section are relatively weakened portions 11f. In other words, the vehicle body side extending portion 11j and the vertically extending portion 11h having an L-shaped cross-sectional shape are formed as relatively high strength portions than the side extending portion 11g that remains a plate-like portion serving as a base. Yes.

Next, the operation of the wiper unit U configured as described above will be described.
For example, when a wiper switch provided in the driver's seat is operated, a drive current is supplied to the motor body 21, and the output shaft 24 and the drive lever 25 are rotationally driven. Then, the power is transmitted to each rocking lever 13a via the link rods R1 and R2, and each pivot shaft 13 is reciprocated by reciprocating rocking and fixed to each pivot shaft 13. The wiper W that has been moved reciprocally swings synchronously, and a wiping operation is performed.

  Then, as shown in FIG. 4, for example, when an external downward force is applied to the pivot shaft 13 (base end portion of the wiper W) due to a collision of an object during traveling of the vehicle, the fragile portion 11f is broken, The pivot shaft 13 and the holder portion 11a rotate about the holder body fixing portion 11b, and the pivot shaft 13 and the holder portion 11a are displaced downward. Therefore, the impact applied to the collided object is absorbed and suppressed.

Next, the characteristic effects of the above embodiment will be described below.
(1) The weakened part 11f is provided in the extending part 11e between the holder part 11a and the frame fixing part 11c in the pivot holder 11. Therefore, for example, when an external force downward in the axial direction is applied to the pivot shaft 13 due to a collision of some object, even if there is no space below the wiper motor M or the frame member 12, the fragile portion 11f is broken and the pivot shaft 13 and the holder are broken. The part 11a can be displaced downward. Therefore, the impact on the object can be suppressed while the arrangement space H is small (see FIG. 4).

  In particular, when the pivot holder 11 has the vertically extending portion 11h, the frame member 12 and the frame fixing portion 11c are fixed at a position further lower than the pivot shaft 13 (vehicle inward position). The wiper motor M as a heavy object fixed to 12 can also be arranged at a lower position. In addition, in this case, when the conventional holder portion 11a and the holder body fixing portion 11b are broken, the vertically extending portion 11h hinders the downward displacement of the pivot shaft 13, but the above-described embodiment. Then, since it breaks at the weakened portion 11f of the extending portion 11e between the holder portion 11a and the frame fixing portion 11c, the pivot shaft 13 is moved downward together with the holder portion 11a with the holder body fixing portion 11b as a fulcrum as shown in FIG. Can be displaced.

  (2) The extending portion 11e includes a side extending portion 11g extending from the holder portion 11a on the opposite side of the vehicle body side extending portion 11j along the direction perpendicular to the axis L1 of the pivot shaft 13, and a side extending portion 11g. And a vertically extending portion 11h connected to the frame fixing portion 11c, and the fragile portion 11f is provided in the laterally extending portion 11g. Therefore, for example, it is easy to ensure a large space below the fragile portion 11f, and thus a large amount of downward displacement of the pivot shaft 13 and the holder portion 11a. That is, an external downward force is applied to the pivot shaft 13 due to some object collision, the fragile portion 11f is broken, and the pivot shaft 13 and the holder portion 11a are displaced downward while rotating around the holder body fixing portion 11b. In this case, the fragile portion 11f can be increased in the downward position of the pivot shaft 13 and the holder portion 11a when it is located as high as possible. In the above configuration, the fragile portion 11f is provided in the side extending portion 11g extending from the holder portion 11a along the direction orthogonal to the axis L1 of the pivot shaft 13, and for example, the extending portion is inclined (lower frame member 12). The position of the fragile portion 11f can be made higher than that when the fragile portion is provided in the middle. Thereby, the downward displacement amount of the pivot shaft 13 and the holder portion 11a can be increased.

  (3) Since the vehicle body side extending portion 11j and the vertical extending portion 11h between the holder portion 11a and the holder vehicle body fixing portion 11b have an L-shaped cross section, the vehicle body extending portion 11j and the vertical direction The rigidity of the extension part 11h can be increased, and the weak part 11f (side extension part 11g) can be formed into a simple plate shape having a rectangular cross section as in this embodiment. Thereby, it becomes the weak part 11f comparatively weak compared with the vehicle body side extension part 11j and the up-down direction extension part 11h of L-shaped cross-sectional shape. In other words, the vehicle body side extending portion 11j and the vertically extending portion 11h having an L-shaped cross-section are made to be relatively high-strength portions than the side extending portion 11g that is a plate-like portion serving as a base. it can.

  (4) The vertically extending portion 11h is an end on the side farther from the swing range Z of the swing lever 13a provided at the lower end of the pivot shaft 13 (the side opposite to the swing side of the swing lever 13a). Since the rib 11m extending to the base end side of the laterally extending portion 11g is formed into an L-shaped cross-sectional shape at the portion, the rib 11m can be attached to the swing lever 13a while increasing the rigidity of the vertically extending portion 11h. It is possible to avoid narrowing the swing range Z.

  (5) The vehicle body side extending portion 11j is an end on the side farther from the swing range Z of the swing lever 13a provided at the lower end of the pivot shaft 13 (the side opposite to the swing side of the swing lever 13a). Since the L-shaped cross section is formed by having the rib 11k extending downward in the portion, the rib 11k narrows the swing range Z of the swing lever 13a while increasing the rigidity of the vehicle body side extending portion 11j. Can be avoided.

  (6) Since the holder vehicle body fixing portion 11b is fixed to the vehicle body via the rubber bush 14 and the rubber bush 14 is fixed, propagation of vibration between the wiper unit U and the vehicle body is suppressed. Further, when an axial downward downward force is applied to the pivot shaft 13 due to some object collision, if the fragile portion 11f is broken, the rubber bush 14 is elastically deformed and crushed so that the pivot shaft 13 and the holder portion 11a are fixed to the holder body. It is allowed to easily rotate around the portion 11b, and the pivot shaft 13 and the holder portion 11a can be displaced downward. Therefore, it is possible to suppress the impact applied to the object, including absorbing the impact when the rubber bush 14 is elastically deformed.

The above embodiment may be modified as follows.
In the above embodiment, the extending part 11e between the holder part 11a and the frame fixing part 11c has a side extending part 11g and a vertically extending part 11h, and the fragile part 11f extends sideways. Although it is provided in the portion 11g, the shape of the extending portion 11e may be changed to another shape. In this case, of course, the position of the fragile portion 11f may be changed to another position of the extending portion. .

  In the above embodiment, the vehicle body side extending portion 11j and the vertical extending portion 11h are L-shaped cross-sectional shapes, but if the shape has relatively higher rigidity than the fragile portion 11f, You may change into another cross-sectional shape. Further, the ribs 11m and 11k may be provided at the end in the width direction on the side close to the swing range Z of the swing lever 13a as long as it does not affect the swing range Z of the swing lever 13a.

  In the above embodiment, the holder vehicle body fixing portion 11b is configured such that the rubber bush 14 is fixed and fixed to the vehicle body via the rubber bush 14, but when the fragile portion 11f is broken, the pivot shaft 13 is fixed. As long as the holder portion 11a can be allowed to be displaced downward, the holder vehicle body fixing portion 11b and the vehicle body side extending portion 11j may be changed to other configurations.

  In the above embodiment, the frame member 12 as a rod-shaped member has a U-shaped cross-sectional shape orthogonal to the longitudinal direction, but is not limited to this, for example, a hollow pipe-shaped member, Other cross-sectional frame members may be used.

  DESCRIPTION OF SYMBOLS 11 ... Pivot holder, 11a ... Holder part, 11b ... Holder vehicle body fixing | fixed part, 11c ... Frame fixing | fixed part (bar-shaped member fixing | fixed part), 11e ... Extension part, 11f ... Fragile part, 11g ... Side extension part, 11h ... Vertically extending portion, 11j: vehicle body side extending portion, 11k, 11m ... rib, 12 ... frame member (rod-like member), 13 ... pivot shaft, 13a ... swing lever, 14 ... rubber bush, M ... wiper motor, W ... wiper, Z ... swing range, L1 ... axis of pivot axis.

Claims (6)

A wiper motor,
A rod-like member to which the wiper motor is fixed;
A holder portion for holding a pivot shaft to which a wiper is connected to an upper end portion, a rod-shaped member fixing portion extending from the holder portion and fixed to the rod-shaped member, and a holder extending from the holder portion and fixed to the vehicle body A wiper unit comprising a pivot holder having a vehicle body fixing part,
The wiper unit according to claim 1, wherein a fragile portion is provided in an extending portion of the pivot holder between the holder portion and the rod-like member fixing portion. The wiper unit according to claim 1,
The extending portion is connected to the side-like extending portion extending from the holder portion along the direction orthogonal to the axis of the pivot shaft and the rod-shaped member fixing portion extending downward from the tip of the side extending portion. Having a vertically extending portion,
The wiper unit characterized in that the fragile portion is provided in the laterally extending portion. The wiper unit according to claim 2,
The wiper unit characterized in that the vehicle body side extending portion between the holder portion and the holder vehicle body fixing portion and the vertical extending portion have an L-shaped cross section. The wiper unit according to claim 2 or 3,
At the lower end of the pivot shaft, a swing lever that can rotate integrally with the pivot shaft and can input and output power is provided.
The vertically extending portion has an L-shaped cross-section by having a rib extending on the base end side of the side extending portion at an end portion far from the swinging range of the swing lever. Characteristic wiper unit. The wiper unit according to any one of claims 1 to 4,
At the lower end of the pivot shaft, a swing lever that can rotate integrally with the pivot shaft and can input and output power is provided.
The vehicle body side extending portion between the holder portion and the holder vehicle body fixing portion has an L-shaped cross section by having a rib extending downward at an end portion far from the swing range of the swing lever. A wiper unit characterized by that. The wiper unit according to any one of claims 1 to 5,
A wiper unit characterized in that the holder body fixing portion has a rubber bush fixed thereto and can be fixed to the vehicle body via the rubber bush.

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