JP4010835B2 - Electric sliding door device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric sliding door device for a vehicle.
[0002]
[Prior art]
2. Description of the Related Art In general, a sliding door device of a vehicle is provided with roller brackets whose base ends are connected to each other by hinges so as to be horizontally rotatable at upper and lower ends of a door front edge and upper and lower intermediate positions of a door rear edge. The rollers are supported at the tips of the roller brackets, are positioned in the upper, lower, and center guide rails, and the doors are opened and closed by moving the rollers along the guide rails.
[0003]
When such a slide door device is electrically driven, an operation wire is coupled to the roller bracket and moved forward and backward by a drive motor so that the slide door can be automatically opened and closed. At this time, in the sliding door device, a latch for engaging the striker at the body opening edge to lock the door is often provided at an intermediate position above and below the rear edge of the door. In order to obtain certainty, it is preferable to connect a wire to the roller bracket of the center guide rail near the installation position of the striker or the like.
[0004]
[Problems to be solved by the invention]
However, as shown in FIG. 3, since the center guide rail 1 needs to draw the rear edge D1 of the slide door D inward of the vehicle when the door is closed, the corner portion 11 at the rail front end has a relatively large curvature. It is curved inward (downward in FIG. 3). For this reason, in the rail linear portion 12 that extends substantially horizontally along the outer surface of the vehicle body in the vehicle front-rear direction (left-right direction in FIG. 3), the roller 4 (showing a vertical roller) provided at the tip of the bracket 2 has a distance L. When moved, the bracket base end 24 on the door side also moves by the same amount, and the amount of movement of the sliding door D in the vehicle front-rear direction along the vehicle body becomes L. However, in the rail corner portion 11, the roller 4 moves to the distance L. Since the bracket base end 24 turns while moving, the amount of movement of the slide door D in the vehicle front-rear direction becomes L ′ larger than the distance L traveled by the roller 4.
[0005]
Therefore, as shown in FIG. 4, when the slide door D is closed (solid line from the chain line in the figure) while the vehicle is parked on a road surface inclined forward by θ, the movement amount L of the roller 4 is reduced. In this case, the lift amount of the center of gravity of the door is Lsinθ at the rail straight portion (FIG. 5 (1)), but the lift amount of the center of gravity is large at L′ sinθ at the rail corner portion (FIG. 5 (2)). For this reason, as shown in FIG. 5, when the sliding door is closed from the fully opened state, the door load rapidly increases at the rail corner portion. Note that the door load starts to increase again in the half door state where the door leading edge hits the weather strip, but the transition from the half door state to the fully closed state is performed by the door closer device, so that it does not burden the drive motor.
[0006]
Increasing the output of the drive motor in response to the sudden increase in the door load causes an increase in size and also limits the power supply from the battery. Therefore, it is conceivable to increase the gear ratio of the reduction gear provided on the output side of the drive motor, but according to this, the moving speed of the sliding door at the rail linear portion having a long distance decreases, so that the sliding door There is a problem that the opening / closing operation becomes slow as a whole.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to provide an electric slide door device for a vehicle that can maintain the quickness of the opening / closing operation of the slide door without increasing the size of the drive motor. To do.
[0008]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, a straight portion (12) extending substantially horizontally along the outer surface of the vehicle body, and a corner portion formed at one end of the straight portion (12) and curved inward of the vehicle. (11) and a guide rail (1) having a guide rail (1) and a guide rail (1) movably disposed along the guide rail (1). A drive motor (3) in an electric slide door device for a vehicle comprising a roller bracket (2) coupled to and a drive motor (3) for moving the roller brat (2) forward and backward along the guide rail (1). Is a DC motor (3) having a low-speed brush ( 32 ) , a high-speed brush (33) and a common brush (31), and is connected to the low-speed brush (32) and the high-speed brush (33), respectively. Switching terminal ( 1, 62) and a common switching circuit (6) having a common terminal (63) connected to the common brush (31) via the battery (5), and a switching command signal (7a) to the switching circuit (6). ) and outputs a drive motor by energizing between the common brush (31) and the high speed brush (33) when the roller bracket (2) is located at the straight portion of the guide rail (1) (12) ( 3) is set to a high-speed mode capable of high- speed rotation with relatively low torque, and at least the guide rail (1) where the door closer device is not operated until the roller bracket (2) reaches the door fully closed position. When located at the corner (11), the drive motor (3) is set to a low speed mode capable of rotating at a relatively high torque at a low speed by energizing between the low speed brush (32) and the common brush (31). A control circuit (7) is provided.
[0009]
In the present invention, since the drive motor is set to the high speed mode in the straight portion of the guide rail, the slide door is moved at a high speed. The door load when moving the roller bracket increases at the corner of the guide rail, but the drive motor is set to low speed mode, so the high torque output keeps the sliding door at the proper speed without stagnation. While being pulled inward of the vehicle. In this way, by switching the drive motor between the low speed mode and the high speed mode, the linear portion while securing the torque for moving the sliding door at an appropriate speed at the corner portion of the guide rail without increasing the size of the drive motor. Thus, the slide door can be moved at a high speed, and the slide door can be quickly operated.
[0010]
In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an electric circuit of the electric sliding door device. The drive motor 3 is a DC motor that moves the operation wire coupled to the roller bracket 2 of the slide door D located in the center guide rail 1 (see FIG. 3) in the forward and reverse directions, and includes a common brush 31, a low speed brush 32, and And a high-speed brush 33. The brushes 31 to 33 are provided at different positions in the circumferential direction and are in sliding contact with the commutator 34. The common brush 31 is connected to the negative electrode of the battery 5, while the low-speed and high-speed brushes 32 and 33 are connected to the switching terminals 61 and 62 of the switching circuit 6. The common terminal 63 of the switching circuit 6 is connected to the positive electrode of the battery 5. As shown in FIG. 1, when the common terminal 63 and the switching terminal 61 of the switching circuit 6 are made conductive to energize between the low-speed brush 32 and the common brush 31, the number of coil conductors connected in series between the brushes 31 and 32 is relative. Therefore, the drive motor 3 is set to the low speed mode. On the other hand, when the common terminal 63 and the switching terminal 62 of the switching circuit 6 are made conductive and energized between the high-speed brush 33 and the common brush 31, the number of coil conductors connected in series between the brushes 31 and 33 is relative. Therefore, the drive motor 3 is set to the high speed mode.
[0012]
The drive motor 3 is provided with a rotation sensor 35 that rotates integrally with its output shaft, and a pulse signal 35a from the rotation sensor 35 is input to a control circuit 7 as a mode selection means incorporating a CPU and a memory. . The control circuit 7 detects the moving position of the roller bracket 2 by counting the pulse signal 35a, and outputs a switching command signal 7a to the switching circuit 6 in accordance with the moving position, and as described later, Electricity is supplied between the common brushes 31 or between the high-speed brush 33 and the common brush 31. In addition, it is necessary to reverse the energization direction to the drive motor 3 when the sliding door D is opened and when the sliding door D is operated. In practice, a switching circuit is provided for this purpose, but the illustration is omitted. To do.
[0013]
In the electric slide door device having such a configuration, when the fully open slide door D is closed in a state where the vehicle is parked on a road surface inclined upward (see FIG. 4), the roller bracket 2 is connected to the rail linear portion 12. During the movement, the control circuit 7 energizes between the high speed brush 33 and the common brush 31 to set the drive motor 3 to the high speed mode. Here, FIG. 2 shows the rotational speed-torque characteristics of the drive motor 3. In the high speed mode (line X), the rotational speed in the low load range is higher than in the low speed mode (line Y), while the low rotational speed. The output torque in several areas is small. The door load during the movement of the roller bracket 2 by the rail linear portion 12 is relatively small (see FIG. 5), and the drive motor 3 set to the high speed mode has a small load torque (= output torque) corresponding to the door load. The high rotation speed R1 is maintained at T1 (FIG. 2), whereby the slide door D is moved at a high speed.
[0014]
When the roller bracket 2 reaches the rail corner portion 11, the control circuit 7 operates the switching circuit 6 and thereafter energizes between the low-speed brush 32 and the common brush 31 until the door is fully closed. To low speed mode. In the low speed mode, with respect to a relatively large door load when the roller bracket 2 is moved at the rail corner portion 11 (see FIG. 5), the drive motor 3 responds to the door load while maintaining an appropriate rotational speed R2. A large output torque (= load torque) T2 (FIG. 2) is generated, whereby the sliding door D is pulled inward of the vehicle at an appropriate speed without stagnation. Then, the slide door D is moved from the half door position to the fully closed position by the door closer device. Even when the sliding door D is opened from the fully closed state while parked on an inclined road surface with a downward slope, the roller straight line portion 12 remains in the low speed mode until the roller bracket 2 passes the rail corner portion 11. In some cases, the sliding door D can be quickly opened by switching the motor characteristics to the high speed mode.
[0015]
In this way, by switching the drive motor between the low speed mode and the high speed mode, the rail is secured while ensuring the torque for moving the slide door D at an appropriate speed in the rail corner portion 11 without increasing the size of the drive motor. It becomes possible to move the slide door D at a high speed in the linear portion 12, and the quick operation of the slide door D is realized. In addition, since the roller bracket 2 turns in the rail corner portion 11, the moving speed of the slide door D becomes larger than the moving speed of the roller bracket 2, but the moving speed of the roller bracket 2 in the rail corner portion 11 is the rail linear portion 12. Therefore, the moving speed of the sliding door D can be made uniform as a whole during the door opening / closing stroke. The drive motor may be switched to the low speed mode only at the rail corner.
[0016]
【The invention's effect】
As described above, according to the electric slide door device for a vehicle of the present invention, the quickness of the opening and closing operation of the slide door can be maintained without increasing the size of the drive motor.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an electric sliding door device.
FIG. 2 is a torque-rotational speed characteristic diagram of a drive motor.
FIG. 3 is a schematic enlarged plan view of a front end portion of a slide rail showing a movement amount when the slide door is closed.
FIG. 4 is a schematic side view of a van-type vehicle showing a change in the position of the center of gravity of a slite door when parked on an inclined road surface.
FIG. 5 is a diagram showing a change in door load with respect to a door stroke of a sliding door.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Guide rail, 11 ... Corner part, 12 ... Linear part, 2 ... Roller bracket, 24 ... Base end, 3 ... Drive motor, 31 ... Common brush, 32 ... Low speed brush, 33 ... High speed brush, 7 ... Control Circuit, D ... sliding door.

Claims (1)

A guide rail having a straight portion that extends substantially horizontally along the outer surface of the vehicle body, a corner portion that is formed at one end of the straight portion and curves inwardly of the vehicle, and is movable along the guide rail. An electric slide door for a vehicle comprising: a roller bracket disposed at one end extending outward of the vehicle and coupled to the slide door so as to be horizontally rotatable; and a drive motor for moving the roller brat forward and backward along the guide rail. In the apparatus, the drive motor is a DC motor having a low speed brush, a high speed brush, and a common brush, and a pair of switching terminals connected to the low speed brush and the high speed brush, respectively, and the common brush via a battery. a single switching circuit having a common terminal connected, outputs a switching command signal to the switching circuit, the roller bracket before Wherein setting the drive motor relative to the low torque can be high-speed rotation at a high speed mode by energizing between the high-speed brush and the common brush when located straight portion of the guide rail, the roller bracket When the door closer device is not in operation until it reaches the door fully closed position, at least in the corner portion of the guide rail, the drive motor is relatively driven by energizing the low speed brush and the common brush. An electric sliding door device for a vehicle, characterized in that a control circuit for setting a low-speed mode capable of low- speed rotation with high torque is provided.

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