JP2005261195A - Motor with reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reverse rotation of a wiper drive motor even if an external force acts under open state of a wiper drive circuit. <P>SOLUTION: In a counter wipe wiper system, wiper blades fixed to right and left wiper arms being driven through independent motors are overlapped vertically. Output shaft 35 of a motor 3a or an armature shaft 33 is provided, between the motor 3a and the wiper arm, with a one-way clutch 40 for transmitting rotation in a predetermined rotational direction preset for the motor 3a and preventing reverse rotation of the motor 3a due to rotation reverse to rotation in the predetermined rotational direction being inputted from the wiper blade side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique that is effective when applied to a motor having a speed reduction mechanism.

  In order to increase the wiping area accompanying the increase in the size of the windshield and improve the visibility in the lateral direction, the wiper arm rotation center is arranged on both the left and right ends of the windshield, and the wiper blade operates from both sides of the windshield toward the center. Opposite wiping type wiper devices have been adopted.

  In this counter wiping type wiper device, a motor for driving the wiper is first arranged at the center of the vehicle, and the left and right wiper blades are operated to oppose each other via a link mechanism. That is, the crank arm is attached to the rotating shaft of the motor, and an intermediate link pivotally supported at the upper and lower intermediate positions is provided, and one end side of the crank arm is connected to the crank arm by the connecting rod. Thereby, the rotational motion of the motor is converted into the reciprocating rocking motion of the intermediate link. Then, the upper and lower ends of the intermediate link are connected to the drive levers of the left and right wiper shafts protruding from the both ends of the windshield via the drive rod, and the left and right wiper arms are operated in opposition.

  However, when the counter-wiping type wiper device is driven by a single motor in this way, a drive mechanism that is almost equal to the full width of the vehicle is required as described above, and the mechanism becomes large and its weight also increases. There was a problem. Therefore, in order to solve such a problem, a system in which the left and right wiper blades are separately driven by a motor has been developed.

  In this case, the left and right motors are separately controlled and driven by a drive circuit as shown in FIG. FIG. 4 is a circuit configuration diagram showing an example of a motor drive circuit of the counter-wiping wiper device, and shows a wiper drive state. Here, the motor 51 is driven by the drive element 53 based on an instruction from the motor drive control device 52, and is turned on / off by the wiper switch 54. Even when the wiper switch 54 is turned off during operation, the wiper blade is automatically stopped at a predetermined position by the action of the relay plate 55.

  However, when an abnormality occurs in the operation of the left and right wiper blades, if the drive element 53 is turned off and the motor 51 is temporarily stopped in the drive range of the relay plate 55, the circuit configuration becomes open and the influence of external force is affected. There is a problem that it is easy to receive. That is, when a force is applied to the wiper blade or the like, electromagnetic braking does not work because the circuit is open, and if the external force is greater than the motor static force, the motor rotates without resisting the force. For this reason, when snow or the like falls on the wiper blade or the like while the wiper blade is stopped and on standby, the wiper blade may move and interfere with the wiper blade on the other side.

  Also, when the position of the wiper blade is controlled by rotating the motor in one direction and using pulses generated in synchronization with the rotation of the motor as angle data, the rotation direction is opposite to the rotation direction determined by the external force. There is also a problem in that the angle data for control is distorted when rotated in the direction of. That is, since the pulses used as the angle data are generated regardless of the rotation direction, the reverse rotation is counted as the forward rotation operation, and the actual wiper blade position and the angle data are deviated accordingly. Become. Therefore, if wiper control is performed based on such erroneous angle data, the wiper blades may not collide with each other and the wiper blades may collide with each other.

  An object of the present invention is to prevent the wiper driving motor from rotating in the reverse direction even when an external force is applied to the wiper blade or the wiper arm when the wiper driving circuit is in an open state.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor unit including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism, comprising: a speed reduction portion having a worm wheel attached to the worm and engaging with the worm; and a housing accommodating the electric motor portion and the speed reduction portion. The armature shaft is provided with a one-way clutch that transmits to the armature and does not transmit the rotation of the worm to the armature shaft.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism having a speed reduction portion provided with a worm wheel that meshes with the worm, and a housing that houses the electric motor portion and the speed reduction portion, and a predetermined rotation direction of the armature The armature shaft is provided with a one-way clutch that prevents reverse rotation of the armature due to rotation input from the output shaft in the reverse direction.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism, comprising: a speed reduction portion having a worm wheel attached to the worm; and a housing that houses the electric motor portion and the speed reduction portion; and a predetermined rotation direction of the armature shaft; Is characterized in that the armature shaft is provided with a one-way clutch for preventing the armature from reversing due to rotation in the reverse direction.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism having a speed reduction part provided with a worm wheel that meshes with the worm, and a housing that houses the electric motor part and the speed reduction part, wherein the armature shaft rotates together with the armature The armature shaft is provided with a one-way clutch that allows the worm to rotate when an external force is applied to the output shaft and the output shaft, the worm wheel, and the worm rotate to prevent the armature shaft from rotating. Characterized by

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism having a speed reduction part provided with a worm wheel that meshes with the worm, and a housing that houses the electric motor part and the speed reduction part, wherein the armature shaft rotates together with the armature One-way that does not transmit the rotation of the worm to the armature shaft when the rotation of the armature shaft is transmitted to the worm and an external force is applied to the output shaft and the output shaft, the worm wheel and the worm rotate. Connect the clutch Characterized in that provided on the armature shaft.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism, comprising: a speed reduction portion having a worm wheel attached to the worm and engaging with the worm; and a housing accommodating the electric motor portion and the speed reduction portion. And a one-way clutch that transmits the rotation of the worm to the armature shaft and is provided between the armature shaft and the worm.

  A motor with a speed reduction mechanism according to the present invention includes an electric motor section including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and an output shaft A motor with a speed reduction mechanism, comprising: a speed reduction portion having a worm wheel attached to the worm; and a housing that houses the electric motor portion and the speed reduction portion; and a predetermined rotation direction of the armature shaft; Is characterized in that a one-way clutch is provided between the armature shaft and the worm to prevent reverse rotation of the armature due to rotation in the reverse direction.

  A motor with a speed reduction mechanism according to the present invention is a motor with a speed reduction mechanism used in a drive device provided in a vehicle, and includes an armature shaft that is rotatably supported in a stator and an armature supported by the armature shaft. A motor part, a speed reducer comprising a worm to which rotation of the armature shaft is transmitted, a worm wheel attached to an output shaft and meshing with the worm, a housing for housing the motor part and the speed reducer, and A rotation is provided between an armature shaft and the worm, transmits rotation of the armature shaft in a predetermined rotation direction to the worm, and rotation input from the output shaft is opposite to the predetermined rotation direction of the armature. A one-way clutch that does not transmit to the armature shaft Characterized in that it.

  With the above configuration, even when an external force is applied to the output shaft of the motor with a speed reduction mechanism, the motor does not reverse and the motor does not move as it is.

  In the present invention, for example, by providing a one-way clutch mechanism for preventing reverse rotation of the motor, such as an armature shaft, for example, even when an external force acts on the output shaft when the wiper drive circuit is in an open state. The motor does not reverse as it is.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the outline of the configuration of a counter-wiping wiper device and its control system.

  In FIG. 1, reference numeral 1 denotes a wiper device driven by a motor with a speed reduction mechanism according to the present invention. The wiper device 1 includes a driver seat side (hereinafter abbreviated as DR side) and a passenger seat side (hereinafter abbreviated as AS side). ) Are arranged opposite to each other, and the DR-side wiper blade 2a and the AS-side wiper blade 2b (hereinafter abbreviated as wiper blades 2a and 2b) are superposed vertically at the lower inversion position. In the wiper device 1, a DR side motor 3a and an AS side motor 3b (hereinafter abbreviated as motors 3a and 3b) are separately provided on the DR side and the AS side, respectively, and positional information of the wiper blades 2a and 2b ( Each is controlled separately based on the position angles θa, θb). Note that “a, b” in the reference numerals indicates members and portions related to the DR side and the AS side, respectively.

  A blade rubber member (not shown) is attached to the wiper blades 2a and 2b. Then, by moving the blade rubber member in close contact with the windshield of the vehicle, water droplets and the like existing in the wiping areas 4a and 4b shown by the two-dot chain lines in FIG. 1 are wiped off. The wiper blades 2a and 2b are supported by wiper arms 6a and 6b that perform a swinging motion left and right about the wiper shafts 5a and 5b. Drive levers 7a and 7b are disposed on the wiper arms 6a and 6b symmetrically with the wiper shafts 5a and 5b. Further, connecting rods 8a and 8b are attached to the end portions of the drive levers 7a and 7b. The other ends of the connecting rods 8a and 8b are connected to the tip ends of crank arms 9a and 9b rotated by the motors 3a and 3b. As the motors 3a and 3b rotate, the crank arms 9a and 9b rotate. This movement is transmitted to the drive levers 7a and 7b via the connecting rods 8a and 8b, and the rotational movements of the motors 3a and 3b are transmitted to the wiper arm. 6a and 6b are converted into swinging motions.

  The motors 3a and 3b are driven by drive circuits provided separately, that is, by the DR side motor drive device 10a and the AS side motor drive device 10b. The motors 3a and 3b are connected to a DR side pulse detection device 11a and an AS side pulse detection device 11b, which are rotation pulse detection means using a Hall element, a rotary encoder or the like, so that the rotation angle can be detected. It has become. In this case, the motor drive devices 10a and 10b are controlled by the wiper drive control device 12, and the detection values of the pulse detection devices 11a and 11b are also sent to the wiper drive control device 12.

  FIG. 2 is a block diagram showing a circuit configuration of the wiper drive control device 12 used in the wiper device 1 according to the present invention. As shown in FIG. 2, the wiper drive control device 12 has a CPU 21 as a center, an I / O interface 22, a microcomputer in which a timer 23, a ROM 24, and a RAM 25 are connected to each other via a bus line 26, And peripheral circuits. And the signal from each pulse detection apparatus 11a, 11b is processed, and a control signal is sent to each motor drive apparatus 10a, 10b.

  The I / O interface 22 is connected to the DR side pulse detection device 11a, the AS side pulse detection device 11b, the DR side motor drive device 10a, and the AS side motor drive device 10b. The ROM 24 stores a control program and various fixed data for control, and the RAM 25 stores output signals to the motor driving devices 10a and 10b after data processing and data processed by the CPU 21. The Then, the CPU 21 executes drive control of the wiper device 1 in accordance with a control program stored in the ROM 24.

  On the other hand, FIG. 3 is an explanatory view showing an example of the configuration of the motors 3a and 3b used in the wiper device 1 according to the present invention. Since the motors 3a and 3b have the same configuration, the motor 3a will be described as an example.

  The motor 3 a has a configuration in which an electric motor unit 31 and a power output unit 34 are stored in a housing 38. In this case, the electric motor unit 31 constitutes a stator 32 fixed to the housing 38, an armature shaft 33 rotatably supported in the stator 32, an armature 39 supported by the armature shaft 33, and an electric motor such as a commutator. And a known member (not shown). The power output unit 34 includes a worm 37 connected to the armature shaft 33 via a one-way clutch (one-way clutch mechanism) 40, and a worm wheel 36 that is attached to the output shaft 35 and meshes with the worm 37. ing. And the crank arm 9a is attached to the output shaft 35 of the motive power output part 34, and rotation of the motor 3a is transmitted to the drive lever 7a via the crank arm 9a and the connecting rod 8a.

  In this case, the rotation of the armature shaft 33 is transmitted to the worm 37 with respect to the rotation in one direction, that is, the predetermined rotation direction set in advance for the motor 3 a by the action of the one-way clutch 40. On the other hand, when the wiper blade 2a and the wiper arm 6a receive an external force and the output shaft 35 receives a rotational force opposite to the predetermined rotational direction, the worm wheel 36 and the worm 37 also have a rotational force opposite to the predetermined rotational direction. receive. However, in the motor 3a, the one-way clutch 40 is interposed between the armature shaft 33 and the worm 37, and such rotational force is not transmitted to the armature shaft 33 side.

  That is, even if a rotational force larger than the stationary holding force of the motor 3a is applied to the worm 37 when the drive circuit is in the open state, the force is released by the one-way clutch 40 and the motor 3a is not reversed.

  On the other hand, a magnet 41 is attached to the armature shaft 33. In the vicinity of the magnet 41, there is provided a pulse detection unit 42 that is composed of a Hall element or the like and detects a rotation pulse indicating a rotation state of the motor by detecting a pole change of the magnet 41. The pulse detection unit 42 in the example of FIG. 3 corresponds to the DR side pulse detection device 11a in FIG. 1, and is provided outside the motor 3a in FIG. 1 to clarify the configuration of the control system. In the case of FIG. 3, this is provided in the housing 38 of the motor 3a.

  In the wiper device 1 having such a configuration, the CPU 21 calculates the position angle of each wiper blade 2a, 2b by the rotation pulse from each pulse detection device 11a, 11b, and further obtains the position angle difference between them. . In this case, the CPU 21 calculates the current position angle of the wiper blades 2a and 2b from the cumulative number of rotation pulses acquired from the pulse detection devices 11a and 11b. The accumulated number of rotation pulses may be handled as a position angle as it is.

  The CPU 21 controls the motors 3a and 3b so that the position angle difference between the wiper blades 2a and 2b becomes a target value set in advance for each position angle of each wiper blade 2a and 2b. That is, when the position angle difference between the wiper blades 2a and 2b becomes smaller than the target (approaching), the motor output on the preceding side is increased and the motor output on the following side is decreased to reduce the difference from the target position angle. Try to shrink. Further, when the position angle difference becomes larger than the target (when separated), the preceding motor output is lowered, the follower motor output is increased, and the difference from the target position angle is reduced. The target position angle difference is stored in the ROM 24 separately for each wiper blade 2a, 2b in the form of a map having correspondence with the counterpart, and the motors 3a, 3b are based on this map. Thus, the wiper blades 2a and 2b having different moving speeds are controlled in consideration of not only their own position angle but also the other position angle.

  In such a control process, when the wiper switch 54 of the circuit shown in FIG. 4 is turned off and the DR side precedes the AS side, for example, the wiper blades 2a and 2b are stopped at the lower inversion position. Needs to temporarily stop the DR side and precede the AS side. Here, it is assumed that when the driving element 53 on the DR side is turned off and the wiper blade 2a is temporarily stopped, an external force in the direction of reversing the motor 3a acts on the wiper blade 2a. At this time, in the conventional motor 3a, when the drive element 53 is turned off by the relay plate 55, the circuit is opened. When the external force exceeds the static holding force of the motor, the motor 3a is reversed and the wiper blade 2a is moved by the external force. It is.

  However, in the motor 3a, even if such an external force is applied, the external force is released by the one-way clutch 40 as described above, thereby preventing the motor 3a from being reversed. Therefore, it is possible to avoid a situation in which the motor 3a reverses and rotation pulses are accumulated, and the position angle data of the wiper blade 2a is distorted. Further, it is possible to prevent a situation in which the wiper blade 2a moves and interferes with the other wiper blade 2b.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above-described embodiment, an example in which the one-way clutch 40 is provided on the armature shaft 33 has been described. good. Further, the one-way clutch 40 only needs to have a configuration that transmits a rotational force in one rotational direction but prevents reverse rotation with respect to a rotational force in the reverse direction. Various clutches and spring clutches can be used.

It is explanatory drawing which shows the structure of an opposing wiping type wiper apparatus, and the outline of the control system. It is a block diagram which shows the circuit structure of the wiper drive control apparatus used in the wiper apparatus of FIG. It is explanatory drawing which shows the structure of the motor used with the wiper apparatus of FIG. It is a circuit block diagram which shows an example of the motor drive circuit of a counter-wiping type wiper apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wiper apparatus 2a DR side wiper blade 2b AS side wiper blade 3a DR side motor 3b AS side motor 4a, 4b Wiping area | region 5a, 5b Wiper shaft 6a, 6b Wiper arm 7a, 7b Drive lever 8a, 8b Connection rod 9a, 9b Crank arm 10a DR side motor drive device 10b AS side motor drive device 11a DR side pulse detection device 11b AS side pulse detection device 12 Wiper drive control device 21 CPU
22 I / O interface 23 Timer 24 ROM
25 RAM
26 Bus line 31 Electric motor part 32 Stator 33 Armature shaft 34 Power output part 35 Output shaft 36 Worm wheel 37 Worm 38 Housing 39 Armature 40 One-way clutch (one-way clutch mechanism)
41 Magnet 42 Pulse detector 51 Motor 52 Motor drive controller 53 Drive element 54 Wiper switch 55 Relay plate

Claims (8)

An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A motor with a speed reduction mechanism, wherein a one-way clutch that transmits the rotation of the armature shaft to the worm and does not transmit the rotation of the worm to the armature shaft is provided on the armature shaft. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A motor with a speed reduction mechanism, wherein the armature shaft is provided with a one-way clutch that prevents reverse rotation of the armature due to rotation input from the output shaft that is in a direction opposite to a predetermined rotation direction of the armature. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A motor with a speed reduction mechanism, wherein the armature shaft is provided with a one-way clutch that prevents reverse rotation of the armature due to rotation in a direction opposite to a predetermined rotation direction of the armature shaft. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A one-way clutch that enables rotation of the worm when the armature shaft rotates together with the armature, and does not rotate the armature shaft when an external force is applied to the output shaft and the output shaft, the worm wheel, and the worm rotate. Is provided on the armature shaft. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
When the armature shaft rotates together with the armature, the rotation of the armature shaft is transmitted to the worm. When an external force is applied to the output shaft and the output shaft, the worm wheel, and the worm rotate, the rotation of the worm A motor with a speed reduction mechanism, characterized in that a one-way clutch that does not transmit to the armature shaft is provided on the armature shaft. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A motor with a speed reduction mechanism, characterized in that a one-way clutch that transmits the rotation of the armature shaft to the worm and does not transmit the rotation of the worm to the armature shaft is provided between the armature shaft and the worm. An electric motor unit having an armature shaft rotatably supported in a stator and an armature supported by the armature shaft, a worm to which rotation of the armature shaft is transmitted, and a worm attached to the output shaft and meshing with the worm A motor with a speed reduction mechanism, comprising: a speed reduction portion including a wheel; and a housing that houses the electric motor portion and the speed reduction portion,
A motor with a speed reduction mechanism, wherein a one-way clutch is provided between the armature shaft and the worm to prevent reverse rotation of the armature due to rotation in a direction opposite to a predetermined rotation direction of the armature shaft. A motor with a speed reduction mechanism used in a drive device provided in a vehicle,
An electric motor unit including an armature shaft rotatably supported in a stator and an armature supported by the armature shaft;
A speed reducer comprising a worm to which rotation of the armature shaft is transmitted and a worm wheel attached to an output shaft and meshing with the worm;
A housing that houses the electric motor portion and the speed reduction portion;
Rotation that is provided between the armature shaft and the worm, transmits rotation of the armature shaft in a predetermined rotation direction to the worm, and is input from the output shaft that is opposite to the predetermined rotation direction of the armature. And a one-way clutch that does not transmit to the armature shaft.

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