JPH0523772U - Wiper motor - Google Patents

Abstract

(57) [Summary] [Purpose] By maintaining the initial state without gaps for a long period of time, the thrust load is accurately absorbed and the operating noise is reduced. [Structure] Contact plate members 16b, 16 are provided on both sides of the elastic member 16a.
The thrust load absorbing member 16 having the structure of c is provided, and the contact plate body 16b on one side of the thrust load absorbing member 16 is brought into contact with the tip end side of the armature shaft 3a and the other side of the thrust load absorbing member 16 is provided. The abutment plate body 16c abuts against the screw 15 that advances and retreats along the axial direction of the armature shaft 3a in the gear casing 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper motor used for wiping a wiping surface with a wiper blade, for example.

[0002]

[Prior Art]

 FIG. 9 exemplifies a wiper motor used for wiping the wiping surface with a wiper blade. In the illustrated wiper motor 50, an armature 52 is housed in a cylindrical motor yoke 51 having a bottom. ..

Further, the armature 52 has an armature shaft 52a, and a commutator 52c connected to the armature coil 52b is provided substantially in the center of the armature shaft 52a, and the armature shaft 52a has a left side in the drawing. At the base end side, a spherical body 52d for supporting the armature shaft, which is made of metal, is housed in a rotatable state.

A worm 52e is formed near the tip of the armature shaft 52a on the right side in the figure, and a worm 52e is formed on the tip of the armature shaft 52a for supporting an armature shaft protruding in a conical shape. A supporting protrusion 52f is provided.

A motor-yoke-side bearing 53, which is a sliding bearing, is mounted in the center of the left end side closed portion 51a of the motor-yoke 51 in the figure, and corresponds to the motor-yoke-side bearing 53. An abutting plate 54 made of metal is provided, and is inserted into the bearing 53 on the motor yoke side with the base end side of the armature shaft 52a abutting the abutting plate 54 on the sphere 52d. Therefore, the base end side of the armature shaft 52a is rotatably supported by the bearing 53 on the motor yoke side.

Further, a magnet 55 is attached inside the motor yoke 51, and an opening 51b on the right end side of the motor yoke 51 in the drawing is provided on the left end side of the gear casing 56 in the drawing. The yoke mounting portion 56a is assembled by screwing a screw (not shown).

A shaft hole 56b formed as a substantially cylindrical opening from the left side to the right side in the drawing is provided at substantially the center of the gear casing 56, and the armature shaft is provided in the shaft hole 56b. The tip end side of 52a projects.

Further, a screw 58 is screwed into a holder base 57 having a circular hole 57a having an inner diameter larger than the outer diameter of the commutator 52c at the center of the yoke mounting portion 56a of the gear casing 56. The brushes 59 and 59 are arranged at positions facing each other with the commutator 52c of the holder base 57 in the center so that they can be pressed against the commutator 52c. Wirings 60 and 60 for external connection are connected to 59 and 59.

A gear casing side bearing 61, which is a rolling bearing, is mounted on the side of the shaft mounting 56 a of the gear casing 56 on the side of the yoke mounting portion 56 a, and a shaft hole corresponding to the bearing 61 on the gear casing side is mounted. On the right end side of 56b in the drawing, a resin filling hole 56c1 is formed which has an inner diameter larger than the outer diameter of the support protrusion 52f of the armature shaft 52a and communicates with the outside of the gear casing 56. The provided resin filling portion 56c is provided.

Further, a circular worm wheel housing portion 56d is provided below the shaft hole 56b in the figure, and the output shaft 62 rotates at the center of the worm wheel housing hole 56d. The wiper blade is supported so that it can be connected to the output shaft 62 via a link (not shown).

Further, a worm wheel 63 is concentrically fixed to the output shaft 62, and the worm wheel 63 meshes with the worm 52e of the armature shaft 52a.

Here, the tip end side of the armature shaft 52a is inserted into the shaft hole 56b of the gear casing 56, and the tip end side of the armature shaft 52a is supported by the bearing 61 on the gear casing side. The base end side of the armature shaft 52a is supported by the bearing 53 on the motor yoke side in a state where the spherical body 52d housed on the base end side of the armature shaft 52a is brought into contact with the contact plate 54 by covering the side with the motor yoke 51. It

By fitting the opening 51b of the motor yoke 51 into the yoke mounting portion 56a of the gear casing 56 and screwing in the screw, the base end side of the rear armature shaft 52a is the motor yoke side bearing 53 and The tip end side of the armature shaft 52a is rotatably supported by a bearing 61 on the gear casing side, and the motor yoke 51 is assembled to the gear casing 56.

Therefore, by filling the resin-filled portion 56c with a damper filler made of a synthetic resin from the outside of the gear casing 56 through the resin-filling hole 56c1, the outer periphery of the support protrusion 52d of the armature shaft 52a. A damper 64 made of synthetic resin is formed on the portion.

The damper 64 is hardened at room temperature to form a support portion 64a having a shape similar to the outer shape of the support protrusion 52d. The support portion 64a is opposed to the support protrusion 52d on the tip side of the armature shaft 52a. Initialize at a position with a predetermined gap.

In the wiper motor 50 having such a structure, when a predetermined power is supplied from the external connection terminals 60, 60 to the commutator 52c via the brushes 59, 59, the armature coil 52b is excited and the magnet 55 is connected. The armature 52 rotates due to electromagnetic induction between them.

Since the armature shaft 52a is rotated by the rotation of the armature 52, the worm wheel 63 meshing with the worm 52e is rotated, and the rotation of the worm wheel 63 rotates the output shaft 62. Activate the ipa blade.

At this time, when a large load is generated on the wiper blade side, when the load acts as a thrust load for moving the worm 52e along the axial direction of the armature shaft 52a through the worm wheel 63, On the tip side of the armature shaft 52a, the support portion 64a of the damper 64 abuts on the support projection 52d of the armature shaft 52a, and the damper 64 absorbs the thrust load, so that the armature shaft 52a does not move in the axial direction. I try to hold it down.

However, in the above-mentioned conventional wiper motor 50, the support protrusion 52f provided on the tip side of the armature shaft 52a is brought into contact with the support portion 64a of the damper 64 formed in the shaft hole 56b of the gear casing 56, so as to contact the armature. Since the thrust load acting on the worm 52e of the shaft 52a is absorbed, the support portion 64a of the damper 64 is always in contact with the support protrusion 52f of the armature shaft 52a. It is difficult to suppress wear, and if the damper 64 wears due to long-term use, the gap from the support portion 64a of the damper 64 to the support protrusion 52f of the armature shaft 52a becomes incorrect, and it becomes larger than the specified value, resulting in thrust load. Can not be absorbed properly, and Therefore, there is a drawback in that the armature shaft 52a moves in the axial direction to generate noise.

[0020]

The problem to be solved is that when the damper is worn, a thrust amount is generated, and noise is generated due to axial movement, which significantly deteriorates the initial performance.

[0021]

[Means for Solving the Problems]

 The wiper motor according to the present invention is provided with a thrust load absorbing member having contact plates on both sides of an elastic body in order to maintain the initially set gap-free state for a long period of time. The contact plate on one side of the member contacts the tip end side of the armature shaft, and the contact plate on the other side of the thrust load absorbing member contacts the screw that advances and retracts in the gear casing along the axial direction of the armature shaft. The most important feature is that the contact plates are held in contact with each other, and in a more preferred embodiment, contact plate holding portions for holding the contact plate in a fitted state are formed on both sides of the elastic body. Characterized in that it is provided with a thrust load absorbing member in which a contact plate body is assembled to the portion, and in a more preferred embodiment, at least one position of the contact plate body, The elastic body holding portion for holding the elastic body in a fitted state is formed, and the elastic body holding portion is provided with a thrust load absorbing member in which an abutting plate body is assembled. By maintaining the state without the set gap for a long period of time, we have realized the purpose of accurately absorbing the thrust load and quieting the operating noise.

[0022]

[Action]

 A wiper motor according to the present invention has a thrust load absorbing member in which a tip end side of an armature shaft is in contact with a contact plate on one side and an abutment plate on one side is elastically connected to the contact plate on the other side. Since the screw advancing and retracting along the axial direction of the armature shaft in the gear casing contacts the contact plate, the elastic body does not directly contact the armature shaft, so that the elastic body does not wear, and the elastic body does not wear. -To secure the initial gap-free state for a long time by absorbing the thrust load when the thrust load acts on the mature shaft and returning to the gap-free state when the thrust load stops acting. Further, the thrust load absorbing member is one in which the contact plate body is attached to the contact plate body holding portion of the elastic body, or one in which the contact plate body is attached to the elastic body holding portion of the contact plate body. In this case, since the volume ratio of the elastic body to the abutting plate body becomes large, a larger thrust load is also absorbed and a state without the initially set gap is secured for a long time.

[0023]

【Example】

 1 and 2 show an embodiment of a wiper motor according to the present invention.

The wiper motor 1 shown in the drawing has an armature 3 housed in a motor yoke 2 having a bottomed cylindrical shape.

Further, the armature 3 has an armature shaft 3a, and an armature coil 3c wound around an iron core 3b is arranged substantially at the center of the armature shaft 3a and is connected to a part of the armature coil 3c. A commutator 3d is provided.

At the base end side, which is the left side of the armature shaft 3a in the figure, a sphere 4 for supporting the armature shaft, which is made of metal, is rotatably housed. A worm 3e is formed near the tip on the right side of the inside, and a sphere 5 for supporting the armature shaft, which is made of metal like the sphere 4, is rotatable on the tip side of the armature shaft 3a in a rotatable state. It is stored.

Further, a bearing 6 on the motor yoke side, which is a slide bearing, is mounted at the center of the closed portion 2a on the left end side of the motor yoke 2 in the figure, and the bearing 6 on the motor yoke side is mounted. Corresponding metal contact plates 7 are provided, and the bearing 6 on the motor yoke side is inserted with the base end side of the armature shaft 3a in contact with the spherical body 4 on the contact plate 7. Therefore, the base end side of the armature shaft 3a is rotatably supported by the bearing 6 on the motor yoke side.

Further, a magnet 8 is attached inside the motor yoke 2, and a yoke provided on the left end side of the gear casing 9 in the drawing is provided in the opening 2b on the right end side of the motor yoke 2 in the figure. The mounting portion 9a is assembled by screwing a screw (not shown).

A shaft hole 9b formed as a substantially cylindrical opening from the left side to the right side in the drawing is provided at substantially the center of the gear casing 9, and the armature is provided in the shaft hole 9b. The tip side of the shaft 3a projects.

In the yoke mounting portion 9a of the gear casing 9, a holder base 10 having a round hole 10a having an inner diameter larger than the outer diameter of the commutator 3d in the center is provided with a screw 11. It is fixed by being screwed in, and brushes 12, 12 are arranged at positions facing each other with the commutator 3d of the holder base 10 as the center so that they can be pressed against the rectifier 3d. External wirings 13 and 13 are connected to the brushes 12 and 12, respectively.

A bearing 14 on the gear casing side, which is a rolling bearing, is mounted in the shaft hole 9b on the side of the yoke mounting portion 9a of the gear casing 9, and a shaft corresponding to the bearing 14 on the gear casing side. On the right end side of the hole 9b in the figure, there is provided a thrust load absorbing member storage portion 9b1 having an opening size substantially equal to the outer diameter size of the worm 3e of the armature shaft 3a.

Further, a female screw hole 9b2 communicating with the outside of the gear casing 9 is formed at the right end side of the thrust load absorbing member storage portion 9b1 in FIG. 1, and the gear screw hole 9b2 is formed in the female screw hole 9b2. A screw 15 for adjusting the thrust gap is tightened from the outside of the casing 9, and the screw 15 is screwed into the armature shaft 3 along the axial direction of the armature shaft shaft 3 in the shaft hole 9b so as to be movable back and forth. is there.

Here, in the thrust load absorbing member storage portion 9b1, as is apparent from FIG. 2, a thrust load absorbing member in which abutting plate bodies 16b and 16c are integrally formed on both sides of the elastic body 16a. 16 is housed in a state of being movable along the axial direction of the armature shaft 3a. Further, the elastic body 16a is made of rubber having elastic repulsion force as a material, and in a state where the elastic body 16a is sandwiched, the contact plate body 16b on one side and the contact plate body 16c on the other side are sandwiched. And are connected.

The end surface of the one-side contact plate 16b on the armature shaft 3a side is the contact surface 16b1 for the sphere 5 provided on the tip side of the armature shaft 3a, and the other-side contact surface 16b1. An end surface of the contact plate body 16c opposite to the armature shaft 3a is a contact surface 16c1 for contacting the screw 15.

Further, a circular worm wheel housing portion 9c is provided below the shaft hole 9b of the gear casing 9 in FIG. 1, and the output of the worm wheel housing hole 9c is provided at the center thereof. A shaft 17 is rotatably supported, and a wiper blade is connected to the output shaft 17 via a link (not shown).

A worm wheel 18 is concentrically fixed to the output shaft 17, and the worm wheel 18 meshes with the worm 3e of the armature shaft 3a.

Here, when the armature shaft 3a is assembled, the tip end side of the armature shaft 3a is inserted into the shaft hole 9b of the gear casing 9, and the tip end side of the armature shaft 3a is supported by the bearing 14 on the gear casing side. , The base 4 of the armature shaft 3a is covered with the motor yoke 2, and the sphere 4 accommodated on the base end of the armature shaft 3a is brought into contact with the contact plate 7 by the bearing 6 on the motor yoke side. The base end side of the armature shaft 3a is supported.

Then, by fitting the opening 2b of the motor yoke 2 into the yoke mounting portion 9a of the gear casing 9 and screwing in the screw, the base end side of the rear armature shaft 3a is supported by the bearing 6 on the motor yoke side. The front end side of the armature shaft 3a is supported by the bearing 14 on the gear casing side, and the motor yoke 2 is assembled to the gear casing 9.

Therefore, by thrusting the screw 15 from the outside of the gear casing 9, the thrust 15 is abutted on the contact surface 16c1 of the contact plate 16c on the other side of the thrust load absorbing member 16 in the thrust load absorbing member 16. The load absorbing member 16 is moved to the armature shaft 3a side in the thrust load absorbing member housing portion 9b1, and the contact surface 16b1 of the contact plate body 16b on one side of the thrust load absorbing member 16 is moved to the armature shaft 3a. It is brought into contact with the sphere 5 provided on the tip side to adjust the initial setting without a gap.

The contact plate 16b on one side of the thrust load absorbing member 16 contacts the tip side of the armature shaft 3a, and the screw 15 contacts the contact plate 16c on the other side of the thrust load absorbing member 16. The armature shaft 3a is rotatably supported by the bearing 6 on the motor yoke side while the sphere 4 is in contact with the contact plate 7 on the base end side, and the sphere 5 is on the tip end side. The thrust load absorbing member 16 is rotatably supported by the bearing 14 on the gear casing side while being in contact with the contact plate 16b on one side.

In the wiper motor 1 having such a structure, when a predetermined power is supplied to the commutator 3d from the external connection terminals 13 and 13 via the brushes 12 and 12, the armature coil 3c is excited and the magnet 8 is generated. The armature 3 rotates due to electromagnetic induction between them.

Since the armature shaft 3a is rotated by the rotation of the armature 3, the worm wheel 18 meshing with the worm 3e is rotated, and the output shaft 17 is rotated by the rotation of the worm wheel 18. Activate the wiper blade.

At this time, when a large load is generated on the wiper blade side, the load acts as a thrust load for moving the worm 3e through the worm wheel 18 along the axial direction of the armature shaft 3a. , The thrust load is absorbed by the elastic repulsive force of the elastic body 16a of the thrust load absorbing member 16 that is in contact with the spherical body 5 at the tip end side of the armature shaft 3a, and the thrust load is no longer acting. The thrust load absorbing member 16 is moved back to the armature shaft 3a side by the elastic restoring force of the elastic body 16a of the load absorbing member 16, and the abutting plate body 16b on one side is moved to the spherical body on the tip side of the armature shaft 3a. 5 will be returned to the state without the gap that was initialized.

3 and 4 show another embodiment according to the present invention.

In this embodiment, as is apparent from FIG. 4, the elastic body 16a has a wedge shape and the thickness dimension is larger than that of the contact plate bodies 16b and 16c, and the elastic body 16a is also formed. In FIG. 4, tapered side walls 16a1 and 16a2 are formed on the upper and lower sides, respectively, which widen toward the contact plate 16c on the other side.

Further, the center of the contact plate 16c on the other side on the side of the elastic body 16a has a concave shape with an approximate shape slightly smaller than the outer shape of the elastic body 16a, and the front side and the rear side in FIG. 4 are opened. A mouth-shaped elastic body holding portion 16c2 is formed, and the depth dimension of the elastic body holding portion 16c2 is smaller than the thickness dimension of the elastic body 16a.

By fitting the elastic body 16a into the elastic body holding portion 16c2 of the contact plate body 16c, the elastic body 16a is separated into the elastic body holding portion 16c2 of the contact plate body 16c on the other side. The thrust load absorbing member 16 is constructed by abutting the abutting plate body 16b on one side against the elastic body 16a held in the elastic body holding portion 16c2 of the abutting plate body 16c on the other side. To be done.

In this case, since the elastic body 16a is assembled by fitting it to the contact plate body 16c, it is not necessary to use a joining means such as baking, so that the assembling work can be simplified. Is becoming

5 and 6 show another embodiment according to the present invention.

In this embodiment, as is clear from FIG. 6, the elastic body 16a has a rectangular parallelepiped shape and the thickness dimension is larger than that of the contact plate bodies 16b and 16c. At the center of both sides of the elastic body 16a, contact plate body holding portions 16a1 and 16a1 having a rectangular concave shape are formed, and the contact plate bodies 16b and 16c are the contact plate body holding portions 16a1 and 16a1. Is a rectangular parallelepiped shape having a thickness dimension slightly smaller than the depth dimension and having an outer shape slightly larger than the opening dimension of the contact plate holding portions 16a1 and 16a1.

Then, the contact plate bodies 16b and 16c are fitted into the contact plate body holding portions 16a1 and 16a1 of the elastic body 16a, so that the contact plate bodies 16b and 16c are brought into contact with the contact plate body holding portion 16a1. , 16a1 are held inseparably.

In this case, the outer dimensions of the contact plates 16b and 16c are made smaller than the outer dimensions of the elastic body 16a, so that the elastic member with respect to the contact plates 16b and 16c is made smaller. Since the volume ratio of 16a is large, it is designed to absorb a larger thrust load than the thrust load absorbing member 16 shown in FIGS.

Further, due to the volume ratio, the size of the contact surface of the one-side contact plate 16b that contacts the sphere 5 on the tip side of the armature shaft 3a becomes smaller than that shown in FIGS. 1 and 2. Therefore, the thrust load absorbing member 16 can make point contact with the spherical body 5, so that the armature shaft 3a can be smoothly supported.

7 and 8 show another embodiment according to the present invention.

In this embodiment, as is apparent from FIG. 8, the elastic body 16a has a rectangular parallelepiped shape and the thickness dimension is larger than that of the contact plate bodies 16b and 16c. Circular concave contact plate holders 16a1 and 16a1 are formed in the center of both sides of the elastic body 16a, and the contact plate members 16b and 16c are the contact plate holders 16a1 and 16a1. The disk shape has a thickness dimension slightly smaller than the depth dimension and a dimension slightly larger than the opening dimension of the contact plate holding portions 16a1 and 16a1.

Then, the contact plate bodies 16b and 16c are fitted into the contact plate body holding portions 16a1 and 16a1 of the elastic body 16a, so that the contact plate bodies 16b and 16c are brought into contact with the contact plate body holding portion 16a1. , 16a1 are held inseparably.

In this case, the outer dimensions of the contact plates 16b and 16c are made smaller than the outer dimensions of the elastic body 16a, so that the elastic body with respect to the contact plates 16b and 16c is made smaller. Since the volume ratio of 16a is large, it is designed to absorb a larger thrust load than the thrust load absorbing member 16 shown in FIGS.

Further, due to the volume ratio, the size of the contact surface of the one-side contact plate 16b that contacts the sphere 5 on the tip side of the armature shaft 3a becomes smaller than that shown in FIGS. 1 and 2. Therefore, the thrust load absorbing member 16 can make point contact with the spherical body 5, so that the armature shaft 3a can be smoothly supported.

In the thrust load absorbing member 16 in this case, since the contact plate members 16b and 16c and the contact plate member holding portions 16a1 and 16a1 of the elastic member 16a are circular, Since the contact plates 16b and 16c settle down better with respect to the elastic member 16a than that shown in FIG. 6, even if the elastic members 16a are elastically deformed, the contact plate members 16b and 16c are not deformed. Does not come off easily.

[0060]

[Effect of the device]

 As described above, since the wiper motor according to the present invention has the above-mentioned configuration, the elastic body does not directly contact the armature shaft, so that the elastic body does not wear, and the elastic body does not cause the thrust load on the armature shaft. The thrust load is absorbed when is applied and is returned to the state without a gap when the thrust load stops working, so that the initially set state with no gap is secured for a long period of time. In addition, in the thrust load absorbing member, the contact plate body is assembled to the contact plate body holding portion of the elastic body, or the contact plate body is assembled to the elastic body holding portion of the contact plate body. , The volume ratio of the elastic body to the abutting plate becomes large, so even a larger thrust load is absorbed and the initial gap-free state is maintained for a long period of time, so that the thrust load is accurately absorbed. It has the excellent effect of operating quietly.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of a wiper motor according to the present invention.

FIG. 2 is an external perspective view around a thrust load absorbing member in the wiper motor shown in FIG.

FIG. 3 is an external perspective view around a thrust load absorbing member in another embodiment of the wiper motor according to the present invention.

4 is an external perspective view of the thrust load absorbing member shown in FIG.

FIG. 5 is an external perspective view around a thrust load absorbing member in another embodiment of the wiper motor according to the present invention.

6 is an external perspective view of the thrust load absorbing member shown in FIG.

FIG. 7 is an external perspective view around a thrust load absorbing member in another embodiment of the wiper motor according to the present invention.

8 is an external perspective view of the thrust load absorbing member shown in FIG.

FIG. 9 is a partially cutaway side view of a conventional wiper motor.

[Explanation of symbols]

1 Wiper Motor 2 Motor Yoke 3 Armature 3a Armature Shaft 6 Bearing (Motor Yoke Side Bearing) 9 Gear Casing 14 Bearing (Gear Casing Side Bearing) 15 Screw 16 Thrust Load Absorbing Member 16a Elastic Body 16a1 Contact Plate Holding Section 16b , 16c Contact plate (contact plate on one side, contact plate on the other side) 16c2 Elastic body holder 17 Output shaft 18 Worm wheel

Claims (3)

[Scope of utility model registration request] 1. A motor yoke equipped with an armature, a bearing for supporting a base end side of an armature shaft included in the armature, and a gear equipped with a bearing for assembling the armature shaft and supporting a tip end portion of the armature shaft. A casing, an output shaft rotatably housed in the gear casing, a worm wheel that is concentrically fixed to the output shaft and meshes with the armature shaft, and a screw that advances and retracts in the gear casing along the axial direction of the armature shaft. And a thrust load absorbing member having contact plates formed on both sides of the elastic body, wherein the contact plate on one side of the thrust load absorbing member is in contact with the tip side of the armature shaft and absorbs the thrust load. A wiper motor characterized in that an abutting plate on the other side of the member is brought into contact with the screw. 2. A thrust in which contact plate holding portions for holding the contact plate in a fitted state are formed on both sides of the elastic body, and the contact plate is assembled to the contact plate holding portion. The wiper motor according to claim 1, further comprising a load absorbing member. 3. A thrust load absorbing device in which an elastic body holding portion for holding an elastic body in a fitted state is formed in at least one position of the contact plate body, and the contact plate body is assembled to the elastic body holding portion. The wiper motor according to claim 1, further comprising a member for use.