JP2008199695A - Rear wiper motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear wiper motor capable of unfailingly preventing damage of a bracket of the motor of the rear wiper due to impact when a rear door is opened or closed in a vehicle. <P>SOLUTION: The rear wiper motor has a structure in which the motor 10 of the rear wiper comprises a motor case 11 and a gear case 12 coupled to the motor case 11 and having a wiper shaft 13 projecting outside, a bracket 20 for covering an opening of the gear case 12 of the rear wiper motor 10 and fastened and fixed on fastening portions 12a, 12b, 12c, 12d of the gear case 12 via a fastening member 15 is provided and the bracket 20 is attached on the rear door 1 of the vehicle. In the rear wiper motor, a concave bead portion 21 is formed on a surface of the bracket 20 which abuts on the gear case, and the bead portion 21 extends to a portion below the fastening portion 12d of the gear case 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor device for a rear wiper suitable for use when, for example, a rear wiper motor is attached to a vehicle back door via a bracket.

  As a motor device of this type of rear wiper, there is one shown in FIGS. 3 and 4 (for example, see Patent Document 1).

  As shown in FIG. 4, the rear wiper motor 4 includes a yoke 5 and a gear case 6 that is coupled to the yoke 5 and has a wiper shaft 7 protruding outward. A plurality of fastening portions 6 a, 6 b, 6 c, 6 d of the gear case 6 of the motor 4 are fastened and fixed to the bracket 8 via screws 9. The bracket 8 is attached to the inside of the back door 1 of the vehicle.

  Further, as shown in FIG. 3, the wiper shaft 7 of the rear wiper motor 4 attached to the inner side of the back door 1 projects out of the back door 1. A base end portion 3b of a wiper arm 3a of a rear wiper 3 for wiping the rear window glass 2 of the back door 1 is detachably attached to the wiper shaft 7.

Japanese Patent No. 3169826

  In the conventional rear wiper motor 4, a damper rubber G or the like is interposed between the yoke 5 of the rear wiper motor 4 and the bracket 8 in order to reduce a large impact acting on the bracket 8 when the back door 1 is opened and closed. However, a load is applied around the fastening portion 6d of the gear case 6 and the bracket 8 of the rear wiper motor 4, and the bracket 8 with which the fastening portion 6d of the gear case 6 of the rear wiper motor 4 comes into contact is easily damaged. It was.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor device for a rear wiper that can reliably prevent breakage of a bracket due to an impact when the back door is opened and closed. .

  According to a first aspect of the present invention, a motor is constituted by a motor case and a gear case that is coupled to the motor case and has an output shaft protruding outward, covers an opening of the gear case of the motor, and is connected to a fastening portion of the gear case. A rear wiper motor device comprising a bracket fastened and fixed via a fastening member, wherein the bracket is attached to a back door of a vehicle, wherein a concave bead portion is formed on a surface of the bracket contacting the gear case, and the bead portion Is characterized by extending below the fastening part of the gear case.

  According to a second aspect of the present invention, in the motor device for a rear wiper according to the first aspect, the base end portion of the bead is located in a fastening portion of the gear case, and the opening portion of the gear case and the base end portion of the bead portion are provided in the gear case. It is characterized by being blocked by the fastening portion and the bracket.

  According to a third aspect of the present invention, in the motor device for a rear wiper according to the first or second aspect, the bead portion of the bracket and a part of the fastening portion of the gear case intersect each other at a substantially right angle.

  As described above, according to the first aspect of the present invention, the motor is constituted by the motor case and the gear case that is coupled to the motor case and has the output shaft protruding outward, and the surface that contacts the gear case of the bracket. A concave bead portion is formed in the base plate, and the bead portion extends below the fastening portion of the gear case, whereby the rigidity of the bracket can be increased. Thereby, since the impact by opening and closing of the back door can be received by the fastening portion of the bracket having increased rigidity, the breakage of the bracket can be surely prevented.

  According to the second aspect of the present invention, the base end portion of the bead is located in the fastening portion, and the opening of the gear case and the base end portion of the bead portion are blocked by the fastening portion of the gear case and the bracket. It is possible to reinforce the bracket without causing any grease to flow out.

  According to the invention of claim 3, the rigidity of the fastening part of the gear case can be increased even if the length of the bead part is short by crossing the bead part of the bracket and a part of the fastening part of the gear case at a substantially right angle. In addition, the layout can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a state in which a rear wiper motor according to an embodiment of the present invention is attached to a bracket, and FIG. 2 is a cross-sectional view taken along line YY in FIG. In addition, the back door of the vehicle shown in FIG. 3 is used.

  As shown in FIGS. 1 and 3, the rear wiper motor 10 is attached to the inside of the back door 1 of the vehicle via a metal plate bracket 20. This rear wiper motor 10 is connected to a yoke (motor case) 11 having a flat metal shape that houses an armature (not shown) that rotates when energized, and is connected to the yoke 11 and rotates via a built-in reduction mechanism (not shown). It is composed of a metal box-shaped gear case 12 in which a wiper shaft 13 having a threaded portion 13a formed at the tip as a pivot shaft is projected outward. Grease is applied to the speed reduction mechanism in the gear case 12. Around the gear case 12 of the rear wiper motor 10, a plurality of fastening portions 12a, 12b, 12c, and 12d are formed in a thick flange shape. A plurality of fastening portions 12 a, 12 b, 12 c, 12 d of the rear wiper motor 10 are fastened and fixed to the bracket 20 via screws (fastening members) 15 so as to cover the opening of the gear case 12. In this case, the bracket 20 also has a function of a cover that covers the opening of the gear case 12. The bracket 20 is fastened and fixed to an inner panel or the like (not shown) of the back door 1 via a screw (fastening member) or the like (not shown).

  As shown in FIGS. 1 and 2, a bead portion 21 having a concave cross section is formed in a straight line on the surface of the bracket 20 that contacts the gear case 12. The bead portion 21 extends below the fastening portion 12 d of the gear case 12, the base end portion 21 a of the bead portion 21 is located in the fastening portion 12 d of the gear case 12, and the bead portion 21 and the fastening portion 12 d of the gear case 12 are located. Some cross at a right angle. In this case, the bead portion 21 formed on the bracket 20 is located near the coupling portion between the yoke 11 and the gear case 12, that is, in the fastening portion 12 d of the gear case 12 at a position close to the center of gravity of the rear wiper motor 10.

  And although the base end part 21a of the bead part 21 formed in the bracket 20 is located under the fastening part 12d of the gear case 12, the opening of the gear case 12 and the bead part 21 do not communicate with each other. It is interrupted | blocked when the fastening part 12d of the gear case 12 and the bracket 20 contact | abut.

  The threaded portion 13 a of the wiper shaft 13 of the rear wiper motor 10 attached to the inner side of the back door 1 projects out of the back door 1. A base end portion 3b of a wiper arm 3a of a rear wiper 3 for wiping the rear window glass 2 of the back door 1 is detachably attached to a screw portion 13a of the wiper shaft 13.

  According to the motor device of the rear wiper of the embodiment described above, the concave bead portion 21 is formed on the surface of the bracket 20 that contacts the gear case 12, and the bead portion 21 extends below the fastening portion 12 d of the gear case 12. The rigidity of the bracket 20 with which the fastening portion 12d of the gear case 12 abuts can be increased. Thereby, since the impact by opening and closing of the back door 1 can be received by the bracket 20 having increased rigidity, the bracket 20 can be reliably prevented from being damaged.

  Further, the base end portion 21 a of the bead portion 21 is located in the fastening portion 12 d of the gear case 12, and the opening of the gear case 12 and the base end portion 21 a of the bead portion 21 are blocked by the fastening portion 12 d of the gear case 12 and the bracket 20. By doing so, the bracket 20 can be reinforced without the grease inside the gear case 12 flowing out.

  Further, by making the bead portion 21 of the bracket 20 and a part of the fastening portion 12d of the gear case 12 intersect substantially at right angles, the rigidity of the fastening portion 12d of the gear case 12 can be increased even if the length of the bead portion 21 is short. In addition, the layout can be improved.

  Further, by providing the bead portion 21 in the fastening portion 12d of the gear case 12 near the joint portion between the yoke 11 and the gear case 12, even if a large load near the center of gravity of the rear wiper motor 10 is applied, the fastening portion 12d of the gear case 12 is applied. By improving the rigidity of the bracket 20 in the vicinity of the contact, it is possible to reliably prevent the bracket 20 from being damaged.

It is a top view which shows the state which attached the rear wiper motor of one Embodiment of this invention to the bracket. It is sectional drawing which follows the YY line in FIG. It is explanatory drawing which shows the state which mounted the rear wiper motor in the back door of the vehicle. It is a top view which shows the state which attached the conventional rear wiper motor to the bracket.

Explanation of symbols

1 Vehicle back door
10 Rear wiper motor (motor)
11 Yoke (motor case)
12 Gear case 12a, 12b, 12c, 12d Fastening part 13 Wiper shaft (output shaft)
15 Screw (fastening member)
20 Bracket 21 Bead part 21a Base end part

Claims (3)

A motor case is composed of a motor case and a gear case coupled to the motor case and having an output shaft protruding outward, covers the opening of the gear case of the motor, and is fastened and fixed to a fastening portion of the gear case via a fastening member. A rear wiper motor device, wherein the bracket is attached to a back door of a vehicle.
A motor device for a rear wiper, wherein a concave bead portion is formed on a surface of the bracket that contacts the gear case, and the bead portion extends below a fastening portion of the gear case. The motor device for a rear wiper according to claim 1,
The rear wiper motor device is characterized in that a base end portion of the bead is located in a fastening portion of a gear case, and an opening portion of the gear case and a base end portion of the bead portion are blocked by a fastening portion of the gear case and a bracket. . The motor device for a rear wiper according to claim 1 or 2,
A motor device for a rear wiper, characterized in that a bead portion of the bracket and a part of a fastening portion of the gear case intersect at a substantially right angle.

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