JP4015783B2 - Wiper motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiper motor used to wipe a wiping surface with a wiper.
[0002]
[Prior art]
As a wiper motor that wipes the wiping surface with a wiper, a gear case is fixed to the lower side of the cowl top panel so that the output shaft protrudes from a through hole formed in the cowl top panel of the vehicle body. It is known that the arms are connected.
[0003]
[Problems to be solved by the invention]
In the wiper motor described above, in order to prevent rainwater entering the cowl top panel from being applied to the wiper motor, a grommet is attached to the output shaft, and the grommet is fitted in the through hole of the cowl top panel. It is not easy to fit the grommet into the through hole, and there is a problem that the operator may damage the finger at the edge of the through hole of the cowl top panel. The problem was to solve this problem.
[0004]
OBJECT OF THE INVENTION
An object of the wiper motor according to the present invention is to provide a wiper motor that can be attached to a vehicle body panel extremely easily and safely.
[0005]
[Structure of the invention]
[0006]
[Means for Solving the Problems]
In the wiper motor according to claim 1 of the present invention, a motor yoke, a gear case coupled to the motor yoke and fixed to the lower side of the vehicle body panel, an armature having an armature shaft disposed in the motor yoke and rotated by energization, A reduction mechanism arranged in the gear case and meshed with the armature shaft of the armature, and an output shaft coupled to the output end of the reduction mechanism, protruding to the outside of the gear case, and inserted into a through hole formed in the vehicle body panel And a motor arm coupled to the output shaft inserted into the through hole of the vehicle body panel, and a disc shape having an outer diameter larger than that of the through hole of the vehicle body panel and attached to the output shaft and can be in close contact with the through hole a main body comprising a sealing member having, in the main body portion of the seal member, it is from the outer edge of the main body portion to the inclined outward, the upper Body panel side contact portion insertion hole for elastically close contact with the vehicle body panel is characterized in that a configuration which is formed integrally.
[000 7 ]
In the wiper motor according to claim 2 of the present invention, the seal member is disposed so as to protrude from the outer peripheral side of the vehicle body panel side contact portion and can be locked to the lower surface outside the through hole of the vehicle body panel. The structure is characterized in that the portion is formed integrally with the vehicle body panel side contact portion.
[000 8 ]
In the wiper motor according to claim 3 of the present invention, the seal member is disposed between the vehicle body panel side contact portion and the vehicle body panel lower surface side locking portion, and the vehicle body panel lower surface side locking portion is disposed on the lower surface of the vehicle body panel. Thus, the elastic part for elastically adhering to the vehicle body panel is formed integrally with the adhering part on the vehicle body panel side.
[000 9 ]
In the wiper motor according to a fourth aspect of the present invention, the seal member includes an output shaft side contact portion that is disposed around the output shaft that protrudes to the outside of the gear case and that can rotate and support the output shaft. It is formed integrally with the side contact portion, and the output shaft side contact portion is characterized in that an oil reservoir for holding lubricating oil is formed between the output shaft and the output shaft .
[00 10 ]
[Effects of the Invention]
In the wiper motor according to claim 1 of the present invention, the seal member is a circle having an outer diameter larger than that of the through hole of the vehicle body panel, with the output shaft inserted through the through hole of the vehicle body panel and attached from the lower side of the vehicle body panel. The vehicle body panel side contact portion inclined outward from the outer edge of the plate-shaped main body portion is elastically adhered to the through hole of the vehicle body panel. Therefore, since the seal member covers the through hole of the vehicle body panel at the same time that the gear case is attached to the vehicle body panel, the seal member can be attached to the vehicle body panel without being fitted to the vehicle body panel, and the mounting position with respect to the vehicle body panel can be set. Even if there is a shift, the seal member is in close contact with the through-hole of the vehicle body panel by the inclined contact portion of the vehicle body panel absorbing the shift.
[00 11 ]
In the wiper motor according to claim 2 of the present invention, the seal member is attached from the lower side of the vehicle body panel with the output shaft inserted through the through hole of the vehicle body panel, so that the lower surface side locking portion of the vehicle body panel is passed through the vehicle body panel. Lock to the lower surface outside the hole. Therefore, in addition to the operation of the first aspect , the seal member includes a vehicle body panel side contact portion that elastically adheres to the through hole of the vehicle body panel, and a vehicle body panel lower surface side that is locked to the lower surface outside the through hole of the vehicle body panel. The locking part ensures close contact with the vehicle body panel side.
[00 12 ]
In the wiper motor according to claim 3 of the present invention, the seal member is mounted on the lower side of the vehicle body panel by the elastic force of the elastic portion by the output shaft being inserted into the through hole of the vehicle body panel and attached from the lower side of the vehicle body panel. The locking portion is in close contact with the lower surface of the vehicle body panel. Therefore, in addition to the operation of the second aspect , even when the wiper motor mounting position is displaced due to vibration of the vehicle body, the displacement is absorbed by the elastic portion so that the displacement between the vehicle body panel and the seal member is reduced. There is no gap between them.
[00 13 ]
In the wiper motor according to claim 4 of the present invention, the sealing member holds the lubricating oil by the oil reservoir formed in the output shaft side contact portion while the output shaft side contact portion rotates and supports the output shaft. To do . Therefore, in addition to the actions of claims 2 and 3 , the seal member does not pass rainwater to the gear case side when the output shaft rotates , and the seal member is made of lubricating oil and fat held in the oil reservoir. Friction with the output shaft is kept small.
[00 14 ]
DETAILED DESCRIPTION OF THE INVENTION
[00 15 ]
【Example】
1 to 4 show an embodiment of a wiper motor according to the present invention.
[00 16 ]
The wiper motor 1 shown in the figure mainly comprises a motor yoke 2, a first magnet 3, a second magnet 4, a gear case 5, an armature 6, a speed reduction mechanism 7, an output shaft 8, a motor arm 9, and a seal member 10. The wiper motor 1 is disposed below the cowl top panel 50 of the vehicle body, and is fixed to the lower side of the dash panel 52 for forming a space-like link housing portion 51. The dash panel 52 is formed with a round hole-like through hole 52a for inserting the motor arm 9 into the link housing portion 51 and four screw holes 52b for fixing the wiper motor 1.
[00 17 ]
In the motor yoke 2, a first magnet 3 and a second magnet 4 are attached to face each other, and an armature 6 is disposed on the inner peripheral side of the first and second magnets 3 and 4. The armature 6 is provided with an armature shaft 11. The armature shaft 11 includes a first bearing 12 attached to the closed end of the motor yoke 2 and a second bearing 13 attached to the gear case 5. The armature shaft 11 is formed with a first worm 11 a and a second worm 11 b in the gear case 5.
[00 18 ]
A commutator 14 is attached to the armature 6 on the armature shaft 11. In the armature 6, a plurality of brushes (not shown) are press-contacted to the commutator 14 so that they can be electrically connected, and the brushes are electrically connected to an external wiper control circuit. As a result, an armature coil (not shown) provided in the armature 6 is excited through the commutator 14, and the armature shaft is generated by the magnetic force generated from the armature coil and the magnetic force generated from the first and second magnets 3 and 4. 11 rotates. The first worm 11a and the second worm 11b of the armature shaft 11 are engaged with a first reduction gear 15 and a second reduction gear 16 that constitute a part of the reduction mechanism 7, respectively.
[00 19 ]
The first and second reduction gears 15 and 16 are two-stage gears, and are disposed in a gear housing portion 5 a formed in the gear case 5, and each is rotatably supported by the gear case 5. The first and second reduction gears 15 and 16 have large-diameter side gears 15 a and 16 a meshed with the first and second worms 11 a and 11 b, respectively, and the small-diameter side gears 15 b and 16 b each other than the speed reduction mechanism 7. Is meshed with an output gear 17 constituting a part of the motor.
[00 20 ]
The output gear 17 is disposed in the gear housing 5 a of the gear case 5 together with the first and second reduction gears 15 and 16, is rotatably supported by the gear case 5, and is coupled to the output shaft 8. The output shaft 8 is rotatably supported by an output shaft support portion 5b that is formed in a cylindrical shape protruding from the bottom wall 5c of the gear case 5. An end 8a of the output shaft 8 is disposed so as to protrude from the output shaft support portion 5b. A motor arm 9 is coupled to the end 8 a of the output shaft 8.
[00 21 ]
As shown in FIG. 2, the motor arm 9 has a rectangular plate shape, the base portion is inserted into the output shaft 8, and the nut 18 is screwed into the output shaft 8 to be screwed to the output shaft 8. ing. A ball pin 19 is fixed to the tip of the motor arm 9. The motor arm 9 is inserted into the link housing portion 51 from the through hole 52a of the dash panel 52, and the ball pin 19 is rotatably connected to a link rod (not shown) in the link housing portion 51.
[00 22 ]
The motor arm 9 rotates together with the output shaft 8 when the armature shaft 11 rotates, the first and second reduction gears 15 and 16 rotate, and the output gear 17 rotates. The ball pin 19 is moved circularly, and the wiper is reciprocally swung through a link connecting rod (not shown) by the circular movement of the ball pin 19.
[00 23 ]
In the gear case 5, four vehicle body side fixing portions 5d are formed so as to protrude from the bottom wall 5c. A cylindrical rubber damper 20 is fitted to each of the vehicle body side fixing portions 5d at the forked end portions. The vehicle body side fixing portion 5d is configured such that each of the rubber dampers 20 is brought into contact with the lower surface 52c of the dash panel 52, and the bolts 53 respectively inserted into the rubber damper 20 are passed through the screw holes 52b of the dash panel 52 from below. The nuts 54 are screwed into the bolts 53 in the link housing portion 51 to be fixed to the lower side of the dash panel 52.
Since the vehicle body side fixing portion 5d is fixed to the lower side of the dash panel 52 via the rubber damper 20, the gear case 5 is not directly subjected to vibration of the vehicle body.
A seal member 10 is attached to the output shaft 8 between the output shaft support portion 5 b of the gear case 5 and the motor arm 9.
[00 24 ]
The seal member 10 is made of elastic rubber and is made of a main body 10a, an output shaft side contact portion 10b, an oil reservoir 10c, a gear case side fitting portion 10d, a vehicle body panel side contact portion 10e, and a vehicle body panel lower surface side locking portion 10f. The elastic portion 10g is integrally formed.
[00 25 ]
The main body 10a has a thickness T1 larger than the thickness of the dash panel 52, and has an umbrella shape from the output shaft 8 side toward the inner edge of the through hole 52a of the dash panel 52. The output shaft side contact portion 10b is formed.
[00 26 ]
As shown in FIG. 4, the output shaft side contact portion 10b has an inner diameter D1 that is slightly larger than the outer diameter of the output shaft 8, and a cylinder having a thickness T2 that is larger than the thickness T1 of the main body 10a. It is made into a shape. Since the output shaft side contact portion 10b is formed along the axial direction of the output shaft 8, the output shaft 8 can be rotated by being fitted to the output shaft 8 near the output shaft support portion 5b of the gear case 5. And support closely.
[00 27 ]
Oil reservoirs 10 c are formed at two locations on the output shaft side contact portion 10 b along the axial direction of the output shaft 8. As shown in FIG. 4, each of the oil reservoirs 10c has a larger inner diameter dimension D2 than the inner diameter dimension of the output shaft side contact portion 10b. Therefore, as shown in FIG. A lubricating oil 60 is applied. The oil reservoir 10c holds the lubricating oil 60 between the output shaft side close contact portion 10b and the output shaft 8, so that rainwater does not enter the output shaft support portion 5b of the gear case 5 through the output shaft 8. In addition, the frictional resistance between the output shaft side contact portion 10b and the output shaft 8 is kept small.
[00 28 ]
The gear case side fitting portion 10d is connected in a cylindrical shape below the output shaft side fitting portion 10b, and is larger than the inner diameter dimension D1 of the output shaft side fitting portion 10b, as shown in FIG. The inner diameter D3 is slightly larger than the outer diameter of the output shaft support 5b of the gear case 5. Since the gear case side fitting portion 10 d is fixed to the gear case 5 by being fitted to the output shaft support portion 5 b of the gear case 5, the gear case side fitting portion 10 d has a function of preventing the seal member 10 from being detached from the gear case 5.
[00 29 ]
The vehicle body panel-side contact portion 10e has a thickness dimension T3 smaller than the thickness dimension T1 of the main body portion 10a, and is bent outward and downward from the first elastic portion 10h formed at the end of the main body portion 10a. Is formed. As shown in FIG. 1, the vehicle body panel side contact portion 10 e has an outer diameter D <b> 5 that is larger than an inner diameter D <b> 4 of the through hole 52 a of the dash panel 52, so that the wiper motor 1 is fixed to the lower side of the dash panel 52. Thus, a portion in the middle of being inclined downward is elastically pressed against the through hole 52a from below the dash panel 52 by the first elastic portion 10h, thereby closing the through hole 52a.
[00 30 ]
Since the vehicle body panel-side contact portion 10e protrudes downward from the outside of the main body portion 10a, the through hole 52a of the dash panel 52 may be slightly larger or slightly smaller than the aforementioned inner diameter D4. Even if the mounting position of the gear case 5 is deviated due to the fact that the through hole 52a is securely pressed against the through hole 52a and the screw hole 52b of the dash panel 52 is displaced. , and certainly so close the pressure and through-holes 52a in the hole 52a through to permit its displacement.
[00 31 ]
A second elastic portion 10g is formed at the tip of the vehicle body panel side contact portion 10e. As shown in FIG. 3, the second elastic portion 10 g has a V-shaped cross-section and is disposed below the dash panel 52. The body panel lower surface side locking portion 10f is connected to the second elastic portion 10g.
[00 32 ]
The vehicle body panel lower surface side locking portion 10f is formed to protrude to the outer peripheral side of the vehicle body panel side contact portion 10e via the second elastic portion 10g, and has a diameter dimension larger than the thickness dimension of the second elastic portion 10g. It is in the shape of a ring. Since the vehicle body panel lower surface side locking portion 10f is pressed toward the dash panel 52 by the elastic force of the second elastic portion 10g, it is elastically locked to the lower surface 52c outside the through hole 52a of the dash panel 52. At this time, the elastic force with which the vehicle body panel lower surface side locking portion 10f comes into contact with the lower surface 52c of the dash panel 52 is smaller than the elastic force with which the vehicle body panel side contact portion 10e comes into contact with the through hole 52a of the dash panel 52. Thus, the vehicle body panel lower surface side locking portion 10f contacts the lower surface 52a of the dash panel 52, so that the vehicle body panel side contact portion 10e is pressed toward the lower surface 52a side of the dash panel 52 by the elastic force of the second elastic portion 10g. As a result, even if the vibration of the vehicle body is transmitted to the gear case 5 and the output shaft 8, the vehicle body panel side contact portion 10e is in close contact with the through hole 52a of the dash panel 52 without being displaced.
[00 33 ]
In the wiper motor 1 having such a structure, the seal member 10 is passed through the output shaft 8, the gear case side contact portion 10 d of the seal member 10 is connected to the output shaft support portion 5 b of the gear case 5, and the output shaft side contact portion of the seal member 10. The motor arm 9 is screwed to the output shaft 8 after 10b is assembled to the output shaft 8 respectively. Then, from the lower side of the dash panel 52, the motor arm 9 is inserted into the link housing portion 51 through the through hole 52a of the dash panel 52, and the bolts 53 respectively inserted into the rubber damper 20 of the vehicle body side fixing portion 5d of the gear case 5 are inserted. The screw holes 52 b of the dash panel 52 are respectively passed from below, and the nuts 54 are screwed into the bolts 53 in the link housing part 51, whereby the motor arm 9 is disposed in the link housing part 51 and below the dash panel 52. Fixed to the side.
[00 34 ]
When the current of the power source is supplied from the wiper control circuit, the armature shaft 11 rotates, and when the armature shaft 11 rotates, the first and second worms 11a and 11b pass through the first and second worms 11a and 11b. The reduction gears 15 and 16 respectively rotate, and the first and second reduction gears 15 and 16 rotate, whereby the output shaft 8 rotates, the motor arm 9 rotates, and the ball pin 19 rotates. When the ball pin 19 rotates, the link connecting rod connected to the ball pin 19 swings and the wiper reciprocates.
[00 35 ]
As described above, when the wiper motor 1 is fixed to the dash panel 52, the seal member 10 attached to the output shaft 8 has the vehicle body panel side contact portion 10e elastically inserted into the through hole 52a from below the dash panel 52. The vehicle body panel lower surface side locking portion 10f is elastically pressed against the lower surface 52c of the dash panel 52. That is, the vehicle body panel side contact portion 10 e is pressed toward the lower surface 52 a side of the dash panel 52 by the elastic force of the first elastic portion 10 h, and the vehicle body panel side contact portion 10 e is uniformly with respect to the through hole 52 a of the dash panel 52. In close contact. Further, the lower surface side locking portion 10f is in close contact with the lower surface of the dash panel 52 by the elastic force of the second elastic portion 10g. Therefore, the seal member 10 is attached to the dash panel 52 without providing a portion to be fitted to the dash panel 52, and the rainwater that has entered the link accommodating portion 51 passes through the output shaft 8 by the seal member 10 and the gear case 5. Intrusion into the output shaft support 5b is prevented.
[00 36 ]
【The invention's effect】
As described above, according to the wiper motor according to the first aspect of the present invention, the seal member is attached to the body panel by inserting the output shaft into the through hole of the body panel and attaching from the lower side of the body panel. The vehicle body panel side contact portion inclined outward from the outer edge of the main body portion having a disk shape having an outer diameter larger than that of the through hole elastically adheres to the through hole of the vehicle body panel. Therefore, since the seal member covers the through hole of the vehicle body panel at the same time that the gear case is attached to the vehicle body panel, the seal member is attached to the vehicle body panel without being fitted to the vehicle body panel, and the seal member is attached to the vehicle body panel. There is an excellent effect that attachment is extremely easy and can be performed safely. Further, even if there is a displacement in the mounting position with respect to the vehicle body panel, the sealing member is said to be in close contact with the through hole of the vehicle body panel by the inclined vehicle body panel side contact portion absorbing the displacement. Excellent effect.
[00 37 ]
According to the wiper motor of claim 2 of the present invention, the seal member is attached from the lower side of the vehicle body panel with the output shaft inserted through the through hole of the vehicle body panel, so that the lower surface side locking portion of the vehicle body panel is the vehicle body panel. It latches on the lower surface outside the through hole. Therefore, in addition to the effect of the first aspect , the seal member includes a vehicle body panel side contact portion that elastically contacts the through hole of the vehicle body panel, and a vehicle body panel lower surface side that is locked to the lower surface outside the through hole of the vehicle body panel. With the locking portion, an excellent effect of securely contacting the vehicle body panel is obtained.
[00 38 ]
According to the wiper motor according to claim 3 of the present invention, the seal member is mounted on the body panel by the elastic force of the elastic part by inserting the output shaft through the through hole of the body panel and attaching it from the lower side of the body panel. The lower surface side locking portion is in close contact with the lower surface of the vehicle body panel. Therefore, in addition to the effect of the second aspect , even when the wiper motor mounting position shifts due to the vibration of the vehicle body, the shift is absorbed by the elastic portion, and the seal member is separated from the vehicle body panel and the seal member. There is an excellent effect that there is no gap between them.
[00 39 ]
According to the wiper motor according to claim 4 of the present invention, the seal member is supported by the output shaft side contact portion so that the output shaft can rotate and is supported in close contact with the oil reservoir formed in the output shaft side contact portion. Hold. Therefore, in addition to the effects of claims 2 and 3 , the seal member has an excellent effect that rainwater does not pass through the gear case when the output shaft rotates , and the seal member is held in the oil reservoir. The lubrication oil thus produced has an excellent effect that the friction with the output shaft is kept small.
[Brief description of the drawings]
[00 40 ]
FIG. 1 is a partially cutaway side view of a wiper motor according to an embodiment of the present invention attached to a vehicle body panel.
FIG. 2 is a partially cutaway front view of the wiper motor shown in FIG.
FIG. 3 is a partially broken side view of a seal member used in the wiper motor shown in FIG. 1;
4 is a front view of the seal member shown in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wiper motor 2 Motor yoke 5 Gear case 5b Output shaft support part 6 Armature 7 Deceleration mechanism 8 Output shaft 9 Motor arm 10 Sealing member 10a Body part 10b Output shaft side contact part 10c Oil reservoir 10d Gear case side fitting part 10e Car body panel side contact part 10f Car body panel lower surface side locking part 10g Elastic part 11 Armature shaft 52 (Car body panel) Dash panel 52a Through hole 60 Oil for lubricating

Claims (4)

A motor yoke;
A gear case coupled to the motor yoke and fixed to a lower side of a vehicle body panel; an armature disposed in the motor yoke and having an armature shaft that rotates by energization;
A speed reduction mechanism disposed in the gear case and meshed with the armature shaft of the armature;
An output shaft coupled to the output end of the speed reduction mechanism, protruding outside the gear case, and inserted into a through hole formed in the vehicle body panel;
A motor arm coupled to an output shaft inserted through the through hole of the vehicle body panel;
A sealing member having a main body that is attached to the output shaft and can be in close contact with the through-hole, having a disk shape with an outer diameter larger than the through-hole of the vehicle body panel ;
The body portion of the sealing member is integrally formed with a vehicle body panel side contact portion that is inclined outward from the outer edge of the body portion and can be elastically contacted with the through hole of the vehicle body panel . A wiper motor characterized by The seal member has a vehicle body panel lower surface side locking portion that protrudes from the outer peripheral side of the vehicle body panel side contact portion and can be locked to the lower surface outside the through hole of the vehicle body panel. The wiper motor according to claim 1 , wherein the wiper motor is formed. The seal member is disposed between the vehicle body panel side contact portion and the vehicle body panel lower surface side locking portion, and has an elastic portion for elastically contacting the vehicle body panel lower surface side locking portion to the lower surface of the vehicle body panel. The wiper motor according to claim 2 , wherein the wiper motor is formed integrally with the vehicle body panel-side contact portion. The seal member is formed around an output shaft protruding outside the gear case, and an output shaft side contact portion capable of rotating and supporting the output shaft is formed integrally with the vehicle body panel side contact portion . The wiper motor according to claim 3 , wherein an oil reservoir for holding lubricating oil is formed between the output shaft side contact portion and the output shaft .

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