JPS6210392Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power window drive device used in a vehicle.

Power window drive devices are very convenient because they allow you to easily open and close the window glass by operating a switch, but on the other hand, it can cause an unexpected accident if your arm or neck gets caught between the window frame and the window frame while the window glass is rising. Since this occurs, it is necessary to add a safety device.
Various devices have been proposed in the past that are equipped with this, but in general, a pressure-sensitive switch attached to the top of the window frame comes into contact with the window glass when the switch is operated and the window glass is completely closed. This method detects that the window glass is closed and stops the rotation of the motor. However, in such a device,
Since the structure uses the windshield and window frame to detect the position of the windshield, if an arm or neck gets caught when closing the windshield, the pressure-sensitive switch may not operate completely, resulting in low reliability. Moreover, there was a problem that the structure was complicated.

Therefore, a rotating plate is provided on the drive shaft in the lifting mechanism that raises and lowers the window glass according to the rotation angle, and a sensor detects the fully closed, fully open, and intermediate positions of the window glass corresponding to the rotation angle of this rotating plate. Accordingly, a system has been proposed in which the release level of the holding circuit is changed between the fully closed and fully opened positions and the intermediate position of the window glass. but,
In such a device, it is not possible to detect the rotation of the motor, so another detection means must be added.
The disadvantages are that the entire device becomes complicated, the cost is high, and the reliability is low.

The present invention has been devised to eliminate these drawbacks of conventional devices, and provides a power window drive device that is simple in structure, inexpensive, and highly reliable.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of a power window drive device according to the present invention, in which FIG. 1 is a schematic plan view showing a window glass drive mechanism, and FIG.
The figure is a partial side view, and FIG. 3 is a circuit configuration diagram. In Figs. 1 and 2, M is a reversible motor (hereinafter referred to as the motor) for driving the window glass, and a worm fixed to the shaft _a1 is
_W1 meshes with a worm gear _W2 fixed to an axis _a2 perpendicular to the axis a1, and transmits the rotation of _the motor M to _the worm gear _W2 via the worm W1. This worm gear W ₂ is meshed with a sector gear SG that is rotatably supported around an axis a ₃ as a fulcrum, and this sector gear SG follows the rotation of the worm gear W ₂ and rotates by a predetermined angle to operate an elevating mechanism that will be described later. configured to drive. L.K.
is a link mechanism as an elevating mechanism for elevating and lowering a window glass (not shown) in accordance with the rotation angle of the sector gear SG, and this link mechanism
LK is a guide rail GL, which is arranged parallel to the door body (not shown), and a groove along the length of the window glass mounting bracket WB.
Links that form ST ₁ to ST ₃ and intersect at the center
Of LK ₁ and LK ₂ , both ends of LK ₁ are slidably supported in the grooves ST ₁ and ST ₂ , respectively, and the link
One end of LK ₂ is rotatably mounted around axis a ₄ as a fulcrum, and the other end is slidably supported in groove ST ₃ . And, between one end of the link LK ₂ and the center part, there is a connecting link whose one end is fixed to the sector gear SG.
The other end of LK ₃ is fixed and the link mechanism LK
is a connecting link according to the rotation of sector gear SG.
By swinging LK ₃ , the window glass fixed to the bracket WB is moved to the sector gear SG.
It is configured to open and close by moving up and down in the directions A and B shown in the figure in accordance with the rotation angle of. In addition, a sensor SS is configured on the sector gear SG that transmits the rotation of the motor M, and this sensor SS is arranged so that the pitch near the fully closed and fully open positions of the window glass is closely spaced on the concentric circumferential surface of the sector gear SG, and A large number of holes H ₁ to _{H o} are roughly drilled near the positions.
(However, n is an arbitrary number) and each of these holes H ₁ to _{H o}
A pair of light emitting diodes that photoelectrically convert the presence or absence of
It consists of an LD and a phototransistor _T1 . Note that BK ₁ and BK ₂ are brackets fixed to the door body, and BB is a balance spring provided on axis a ₃ .

FIG. 3 is a circuit configuration diagram for controlling the motor M on and off in relation to the response of the sensor SS. In FIG. 3, the emitter of the phototransistor _T1 constituting the sensor SS is connected to the connection point between the base of the transistor _T2 and the resistor _R1 , and its collector is connected to the resistor _R2 connected in series with the collector of the transistor _T2. and is connected to the connection point with the excitation coil ML. The emitter of the transistor _T2 is grounded via a resistor _R3 , and a differentiating circuit consisting of a capacitor _C1 and a resistor _R4 is connected between its collector and ground, and these output a pulse signal corresponding to the response of the sensor SS. It constitutes a pulse generation circuit PG that generates pulses. The connection point between the capacitor C ₁ and the resistor R ₄ is connected to the base of the transistor T ₃ via the diode D ₁ and the resistor R ₅ connected with the polarity shown, and the connection point between the diode D ₁ and the resistor R ₅ is connected to ground. An integrating capacitor _C2 is connected between them. The emitter of the transistor _T3 is grounded, and its collector is connected via an excitation coil ML to contacts _S3 and _S7 , which are commonly connected in an electromagnetic selection switch SW, which will be described later. circuit
A holding circuit HD is configured to self-hold the selection switch SW based on a pulse signal obtained from the PG. The selection switch SW is composed of interlocking first and second switches SW ₁ and SW ₂ that can selectively switch the direction of energization from the DC power supply to the motor M,
The movable contact S ₁ of the first switch SW ₁ is connected to a DC power supply (not shown), and the movable contact S ₈ of the second switch SW ₂
is directly grounded. In addition, the first switch SW ₁
Contacts S ₂ and S ₄ commonly connected within the second switch SW ₂ and contacts S ₁₁ and S ₁₂ commonly connected within the second switch SW 2 are respectively connected to the normal rotation terminal M _a of the motor M,
Contacts S ₅ and S ₆ commonly connected in switch SW ₁
Contacts S ₉ and S ₁₀ commonly connected in the second switch SW 2 and the second switch SW ₂ are respectively connected to the reversing terminal M _b of the motor M. In this case, the first and second switches
For SW ₁ and SW ₂ , each movable contact S ₁ and S ₈ are connected to contacts S ₄ and S ₆
It is set to a neutral state (off) when it is located between contacts _S10 and _S12 , respectively. In addition,
D ₂ is a diode for suppressing back electromotive force.

Next, the operation of the above embodiment will be explained. For example, if you want to automatically raise and close the window glass from a completely open state, first change the movable contact S ₁ of the selection switch SW to contacts S ₂ and S ₃ , and change the movable contact S ₈ to contact S _9. When set in conjunction with , the current supplied from the DC power source is the movable contact S _{1 of the first switch SW 1 -} the contact S ₂ - the contact S ₄ - the motor M - the contact S ₁₀ of the second switch SW ₂ - the contact S ₉ - moving contact S ₉ - flows through the path of ground, and the motor M rotates in the forward direction with this current. During this rotation, the sector gear SG connected to the motor M rotates about the axis _a3 as a fulcrum, and at the same time, the link mechanism LK connected to the sector gear SG also follows the rotation to raise the window glass in the direction A shown in the figure. Furthermore, the current supplied from the DC power source is the movable contact S ₁ of the first switch SW ₁ - contact S ₂ - contact S ₃ - resistor R ₂ - capacitor C ₁
- Diode D ₁ - Capacitor C ₂ - Flows through the ground path and instantaneously charges the integrating capacitor C ₂ . When this charging voltage is applied as a bias to the transistor T ₃ and the transistor T ₃ is turned on, the current supplied from the DC power supply is transferred from the movable contact _{S 1 to} the contact S ₂ to the contact S ₃ to the excitation coil of the first switch SW 1. The current flows through the ML-transistor _T3 -ground path, and the coil ML is energized by the current to self-hold the movable contacts _S1 and _S8 . During this holding, the charging voltage of the capacitor C ₂ is the resistance R ₅ ,
The discharge gradually occurs through the base and emitter of the transistor _T3 , but if the first hole _H1 is located on the same straight line as the light emitting diode LD and the phototransistor _T1 , the phototransistor _T1 receives the light passing through it. At the same time that it turns on in response, transistor _T2 also turns on. This allows the capacitor to
_C1 is discharged and becomes ready for the next charge. When the window glass further rises, the first hole _H1 is shielded from light by the sector gear SG, so the transistor _T2 is turned off, and a pulse signal of a predetermined level is obtained at the collector. Since this pulse signal charges the capacitor C ₂ again, the transistor T ₃
remains on, and the excitation coil ML maintains its self-holding state.

In this way, when the sensor SS is turned on and off depending on the presence or absence of each hole H ₁ to H _o bored in the sector gear SG, the collector of the transistor T ₂ receives a constant level with different periods as shown in FIG. These pulse signals are repeatedly charged and discharged every cycle by the integrating capacitor _C2 , so that the transistor _T3 remains on at the charging voltage. That is, if the time constant of the circuit in which the integrating capacitor _C2 discharges the charged voltage is set to be larger than the longest period Ta of the pulse signal shown in FIG. 4, a predetermined bias is constantly applied to the transistor _T3 , so that Transistor T ₃ is sector gear
The on state is continuously connected until a predetermined time elapses after the nth hole H _o of SG is detected by the sensor SS. As a result, the selection switch SW is self-held by the magnetic attraction action of the excitation coil ML, and the motor M continues to rotate until the window glass is completely closed. Continue rotating until the window glass is completely closed. When the window glass is completely closed, the sensor SS no longer detects the signal, and when the charging voltage of the integrating capacitor C ₂ is completely discharged, the transistor T ₃ turns off, deenergizes the excitation coil ML, and at the same time holds the selection switch SW. is released, and the rotation of motor M stops.

Here, the pitch of the holes near the fully closed position of the window glass can be made dense by a short distance just before the window glass is completely closed. In other words, for about 1 to 2 cm just before the window closes,
Due to the structure of the window, stress is suddenly applied and the speed at which the window rises becomes slower. Therefore, if the hole pitch is constant, as the speed decreases,
The time it takes for the light to pass through the next hole becomes longer, and finally, the time constant of the charge and discharge of the integrating capacitor _C2 becomes longer, and the holding circuit HD is closed before the window is fully closed.
may turn off. Therefore, even if the speed of the window becomes slow, it is necessary to make the hole pitch close just before the window closes in order to ensure that the pulse signal is output within a certain time interval until the window completely closes.

Next, when an arm or the like is caught near the middle position of the windshield as it rises, and the load on motor M increases, this overload weakens the rotational force of motor M, causing sensor SS to respond. Since the period of the pulse signal obtained from the pulse generation circuit PG is longer than the predetermined period near the middle position of the window glass, the voltage already charged in the integrating capacitor _C2 is discharged via the transistor _T3 . Therefore, the voltage drops below that bias voltage. As a result, before the next pulse signal is supplied, the transistor _T3 turns off and deenergizes the excitation coil ML, and the selection switch SW releases its hold and restores to the neutral state, cutting off the energization of the motor M. to stop motor M. In this way, a pulse signal with a longer period than the pulse signal with the longest period obtained from the pulse generation circuit PG when the windshield is under normal load is supplied to the holding circuit HD.
Since the HD releases its hold and stops the rotation of the motor M, an unexpected accident can be prevented even if an arm or the like is caught while the window glass is being raised.

In addition, when the window glass is automatically fully opened from the fully closed state, the movable contact of the selection switch SW
S ₁ to contacts S ₅ and S ₇ and its movable contact S ₈ to contacts
When set in conjunction with _S11 , a reverse current flows into the motor M and the motor M is reversed, thereby allowing the window glass to be fully opened by the same operation as described above.

Furthermore, when raising the window glass manually, connect the movable contact S ₁ of the selection switch SW to the
Set the movable contact S ₈ to S ₄ in conjunction with contact S ₁₀ , and when lowering the window glass, set the movable contact S ₁ to contact S ₆ , and the movable contact S ₈ to interlock with contact S ₁₂ . and set it.

In this way, according to the above embodiment, by drilling a large number of holes H ₁ to H _o in the sector gear SG that transmits the rotation of the motor M to the link mechanism LK, the interior of the elevating mechanism for elevating and lowering the window glass, as in the conventional example, is improved. There is no need to provide a rotating plate on the drive shaft. In addition, a hole _H1 drilled on the concentric peripheral surface of the sector gear SG
~Light emitting diode LD and phototransistor on H _o
By placing a sensor SS consisting of _T1 and detecting the optical on/off signal from the hole,
Rotation of motor M can be detected.

Furthermore, holes H ₁ to _{H o} are formed in the sector gear SG.
The pitch of the window glass, which moves up and down in accordance with the rotation of the sector gear, is made dense near the fully closed and fully open positions, and the pitch near the intermediate position is made coarser and irregularly spaced. The position of the window glass can also be detected based on the pitch difference between the fully closed and fully open positions and the intermediate position of the window glass. This allows the holding circuit HD
If the detection level of is set in advance to a predetermined value according to the period of the on/off signal, that is, the pulse, from the sensor SS, the period of the pulse from the sensor SS becomes shorter near the fully closed or fully open position of the window glass, so Even if the rotational force of the motor M becomes weak due to an increase in load, the transistor _T3 of the holding circuit HD will not turn off. However, near the intermediate position, the synchronization of the pulses becomes longer, so when the rotational force of the motor M weakens due to an increase in load, the transistor
_T3 is turned off to stop motor M. Thereby, even if an arm or the like is caught while the window glass is being raised or lowered, an unexpected accident can be prevented.

In the above embodiment, the sensor SS is configured in the sector gear SG that transmits the rotation of the motor M. However, the present invention is not limited to this, and the window glass can be arranged in accordance with the rotation angle. It is also possible to attach a rotating plate to the shaft _a4 in the lifting mechanism LK that moves up and down, and to configure a sensor SS similar to the embodiment on this rotating plate. Further, this sensor SS can also use a magnetic conversion element in addition to the photoelectric conversion element. In addition, selection switch SW
The switch is not limited to the one in the embodiment, and any other switch may be used, such as one in which a relay is provided separately and the contact portion can be switched in two stages.

As explained above, according to the power window drive device according to the present invention, the window glass, which is driven in accordance with the rotation of the sector gear, is placed near the fully closed and fully opened positions on the concentric peripheral surface of the sector gear that transmits the rotation of the motor. A large number of detection elements are provided, each consisting of holes formed with a dense pitch and a rough pitch near the intermediate position, and the presence or absence of these detection elements is determined by an optical or magnetic sensor. By detecting the on/off signal as an on/off signal and controlling the holding circuit in response to the on/off signal, that is, the period of the pulse, obtained from this sensor,
The rotation of the motor can be detected by the sensor, and the position of the window glass can also be detected from the difference in pitch of the detected element between the fully closed and fully open positions and the intermediate position of the window glass. This eliminates the need to separately detect the position of the windshield and the rotation of the motor as in the past, and together with the simplification of the detection mechanism and circuit,
This has the effect of providing an inexpensive and highly reliable power window drive device.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a power window drive device according to the present invention, in which FIG. 1 is a schematic sectional view of the window drive mechanism, FIG. 2 is a partial side view, and FIG. 3 is a circuit diagram. The configuration diagram, FIG. 4, is an output waveform diagram of the pulse generation circuit shown in FIG. 3. M...Reversible motor, LK...Lifting mechanism, SG...
…Sector gear, SS…Sensor, SW…Selection switch, PG…Pulse generation circuit, HD…Holding circuit.

Claims (1)

[Scope of utility model registration request] A reversible motor for driving a window glass, a lifting mechanism that raises and lowers the window glass according to the rotation of the sector gear via a sector gear that transmits the rotation of the motor, and a restoring function that determines the rotation direction of the motor. An electromagnetic selection switch is arranged on the concentric circumferential surface of the sector gear to correspond to the two points of the fully closed and fully open positions of the window glass, and the pitches in the vicinity of the fully closed and fully open positions are closely spaced and intermediate therebetween. A large number of detected elements including holes provided with a rough pitch near the position, a sensor provided on a concentric peripheral surface of the sector gear to detect the presence or absence of each detected element, and the sensor. A pulse generation circuit converts the signal detected by the circuit into a pulse of a constant level, and an integrating capacitor is charged with the pulse from the pulse generation circuit, and this voltage is discharged according to a predetermined time constant. , a holding circuit that controls self-holding of the selection switch based on the voltage, and the holding circuit holds the selection switch self-holding when the discharge voltage of the integrating capacitor is above a certain value, and when the voltage is constant. A power window drive device characterized in that the self-holding of the selection switch is released when the selection switch is below a value.