WO2017182183A1

WO2017182183A1 - Motor vehicle lock with a locking aid

Info

Publication number: WO2017182183A1
Application number: PCT/EP2017/054646
Authority: WO
Inventors: Artur Torka
Original assignee: Huf Hülsbeck & Fürst Gmbh & Co. Kg
Priority date: 2016-04-21
Filing date: 2017-02-28
Publication date: 2017-10-26
Also published as: DE102016107433A1; EP3426868B1; EP3426868A1; CN109072640B; CN109072640A

Abstract

A door lock for a motor vehicle, comprising a blocking means (3) which is coupled to an electric DC motor (7) for providing a locking aid, wherein coupling means (8, 9, 12) are provided for converting the rotary movement of the DC motor into a blocking movement. The DC motor (7) moves the coupling means from a starting position to a pulled-closed position. Mechanical resetting means exert a prestressing force onto the coupling means in the direction of the starting position. When the supply of voltage to the DC motor (7) is stopped, the resetting means resets the coupling means to the starting position, wherein the resetting of the coupling means is converted into a voltage-generating movement of the DC motor (7). An electrical circuit for driving the DC motor has a first path with discrete components parallel to the DC motor (7), wherein the first path has at least one protection diode (26) and at least one discrete component, which is connected in series with said protection diode, in the form of a non-reactive resistor (27) and/or a Zener diode (28).

Description

Motor vehicle lock with closing aid

The invention relates to a motor vehicle lock with a closing aid. In particular, the invention relates to a

Motor vehicle lock with an electric drive, which brings a locking element when pulling a vehicle lock in engagement with a second locking element. The drive is designed so that the closing process under the action of the

Drive takes place against a spring load, so that after successful locking of the vehicle lock is a provision of the drive by the spring action.

Electrically actuated vehicle door locks are known in the art. In particular, the opening of a

Vehicle door lock via a central locking and a remote control is known, with such a

Opening the unlocking with a motor in the

Car door lock done.

However, the invention relates to the field of drives, which are effective in closing and locking a vehicle lock.

For example, document DE 10 2013 216 328 AI discloses a corresponding lock, which has a so-called

Has closing aid or closing aid.

From DE 10 2013 102 814 AI another lock is shown, in which a corresponding closing device is provided.

Finally, DE 10 2010 055 530 AI discloses a vehicle lock with a closing aid of the type mentioned.

Such locks can basically in side doors of a vehicle, in rear doors and in tailgates

be used. Here, the electrical Zuziehantrieb a motor implementation or support the final closing process for a closure element of the vehicle lock is used. A flap of the vehicle is against the force of seals or springs or friction or other counteracting forces from a prelocking position, into a locked position

Brought home closing position. The user thus brings the flap, for example the side door or the tailgate, in the prelocking position, wherein the various closing elements of the lock (for example, the rotary latch and the striker) are in engagement distance from each other. Then, the rotary latch is moved by the motor drive so that it engages in the striker and the flap in a locked

Position pulls. This process is in the above

Publications described.

In some designs, the motion while closing the door or flap is indeed driven by a motor, the provision for successful closure is effected by a spring element. If, for example, the drive acts on the closing elements of the lock via a Bowden cable, it will decrease

Locking and locking the closing process, the drive is turned off and the Bowden cable is retracted by a spring bias to its original position. If no clutch is provided, while the electric motor is driven, since this rotatably by an impact chain with the

is coupled to recovered elements. The engine is thus driven externally and acts as a generator. This leads on the one hand to a load on the motor, which generates considerable voltages in this operation, and on the other hand to a

unwanted noise in the recovery of the

Systems.

The object of the invention is to provide an improved

To provide vehicle door lock device, which is more durable and comfortable.

This object is achieved by a

Motor vehicle door lock solved with the features of claim 1.

According to the invention, the door lock is designed for a motor vehicle and has at least one locking means, which is coupled to a DC electric motor for providing a closing aid. The blocking means can in particular a catch, which can engage in a locking bolt on the vehicle, as described in the prior art. A rotary latch is also described as a rotary latch and has a receptacle into which a part of a locking bracket can dip, so that upon rotation of the rotary latch a pulling movement

between the bearing of the catch and the locking bracket is exercised. As a result, for example, a tailgate, on which the rotary latch is rotatably and fixedly fixed, in the

Seal a tailgate system to be pulled when the

Locking bracket is fixed to the body of the vehicle.

In the locked disfigurement then usually engages a pawl in the catch to lock the catch in this position. Upon release of the lock, the pawl is moved relative to the rotary latch and the rotary latch can in turn pivot in the release position. According to the

Invention, the blocking means is moved from a prelocking position by means of the electric DC motor in the blocking position. In this process, two coupling components of the door lock, which are positioned in the pre-closed position in engagement with each other, are moved by the DC motor into a final blocking position, in which the

Vehicle lock is locked. As a result, the lock is brought against the force of the seal or frictional forces in its closed position without effort of the user.

To move the DC motor into a movement of the DC motor

Coupling means are formed coupling means between the DC motor and the blocking means, which translate a rotational movement of the DC motor in a blocking movement of the blocking means. The coupling means can be designed in many ways, in particular, a worm drive with a meshing gear and a Bowden cable coupled thereto

be provided to exert a pulling movement on the locking means, such as the rotary latch. For this purpose is

by way of example to the document DE 10 2010 055 530 Al referenced, which shows a corresponding arrangement with coupling means in the form of a Bowden cable and a worm drive. The coupling means are during this process in which the locking means from the prelocking in the

Locked position to be moved, also moved. In the example mentioned, the worm drive is driven by the motor and the Bowden cable is adjusted to actuate the locking means. This meant that the coupling means moved between a starting position in which the coupling means release the locking means and a Zuziehstellung in which the

Coupling means have brought the locking means in the locked position. As already described, locked in this blocking position of the locking means, the lock and the locking means are locked in this blocking position.

The DC motor is so with the coupling agent

coupled, that it the coupling means at voltage supply of the DC motor from the starting position in the

Zuziehstellung transferred, so the closing movement through

Motor support executes. There are mechanical return means coupled to the coupling means, which a biasing force on the coupling means in the direction of the starting position

exercise. This return means may be in particular spring means which the Bowden cable in its initial position

push back, e.g. by tensioning a coupled sprocket or gear. When the closing force is exerted, the motor also has to overcome the mechanical force of the mechanical return means and pulls the lock counter to the preload force into the blocking position.

When the end position is reached, the power supply of the motor is switched off and the mechanical restoring force of the mechanical return means continues to act on the

Coupling agent. The cancellation of the power supply also eliminates the corresponding counterforce of the DC motor and the coupling means are from the Zuziehstellung in the

Reset initial position. Since the coupling means continue to be coupled to the DC motor, it will

Resetting movement translated into a rotational movement of the engine and the engine is operated at this provision as a generator. So it is a voltage-generating movement of the DC motor running, driven by the

Restoring force of the mechanical return means.

For the DC motor according to the invention a

Drive circuit formed as an electrical circuit for driving the DC motor. The drive circuit is

initially built like a conventional motor circuit. According to the invention, however, in the electrical circuit for

Driving the DC motor a path with discrete

Components connected in parallel to the DC motor, wherein the first path has at least one protective diode and

at least one discrete component connected in series therewith, this discrete component having an ohmic resistance and / or a Zener diode with opposite reverse direction to the

Protective diode has.

The use of protective diodes in motor circuit is known. According to the invention, however, a further discrete component is additionally used in the path parallel to the motor in which the protective diode is placed. This discrete component acts during generator operation of the

Motors in which the protective diode is permeable when

Engine brake. This design makes it possible for the

Rotational speed of the motor is limited in the provision by the mechanical return means. An ohmic

Resistor provides a voltage drop and acts as a load for the generator braking. This braking reduces the noise of the return movement and also reduces the maximum generated voltage on the motor. While an unbraked motor can generate significant voltages and eventually lead to erosion of the electrodes during abrupt standstill and short-circuit current, this measure reduces wear.

The use of a Zener diode is still in this regard

more advantageous, since the tolerated maximum generator voltage can be limited via such a Zener diode. Such a Zener diode acts as a voltage limiter, since it has a strongly voltage-dependent resistance in the range of

Has breakdown voltage. The engine can therefore be relatively free start until the voltage generated by the motor acting as a generator reaches the maximum value specified by the Zener diode. Then the motor is braked and held at this voltage value, which means a fixed speed. By a

appropriate selection of Z-diode, which in numerous

Gradations of the breakdown voltage is available, a vote of the tolerated maximum speed can be done. Thus, the Z-diode has the advantage that the speed can be limited regardless of the ambient conditions. is

for example, the return due to lower

Slows down ambient temperatures anyway, the Zener diode has an improved effect over the ohmic resistance. In a case where the corresponding breakdown voltage is not achieved, no braking effect is exerted. In the case of an ohmic resistance, on the other hand, a braking effect is exerted at all times.

Thus, according to the invention, a motor braking with an ohmic resistance or a Zener diode is realized in the event that a drive motor by elastic return means

is temporarily transferred in a generator mode.

In one embodiment of the invention, a Endlageschalter is provided, which is actuated by the locking means upon reaching the locking position. The limit switch switches the DC motor de-energized when actuated.

So as soon as the blocking means their locked end position

have reached, they press the limit switch and thus the voltage supply to the DC motor is interrupted. Thereafter, the restoring force of the return means acts and transfers the coupling means back to its starting position, wherein the motor is operated in generator mode. The limit switch can also be queried to verify the end position of the blocking means.

As described above, the use of a Zener diode is particularly advantageous. In the current vehicle locks and associated drives, it makes sense to choose a breakdown voltage between 2 V and 9 V, preferably between 4 V and 8 V. At these voltages is a safe return of Ensures coupling means in the starting position and at the same time significantly reduces the noise of the feedback.

It is also preferred that the motor circuit

in addition to the components mentioned a varistor in

Has parallel connection to the DC motor. Such a varistor has the property above a certain

Threshold voltage abruptly a lower differential

To show resistance. He is particularly suitable for protection against overvoltages that could arise during generator operation or during the power supply of the DC motor, where he can short-circuit these overvoltages.

In one embodiment of the invention is to the

DC motor also a thermistor connected in series. Such a thermistor protects the engine and the

Motor supply circuit in addition.

Finally, it is preferable if a throttle in

Series connection to the DC motor is provided as part of the circuit for driving the DC motor. Such a choke (e.g., coil) serves to limit currents in the motor circuit.

The invention will now be explained in more detail with reference to the accompanying drawings.

FIG. 1 shows schematically the arrangement of a

Motor vehicle door lock with an electrical closing aid according to the prior art;

Figure 2 shows a possible design of the formation of drive and coupling means according to the prior art;

FIG. 3 shows a motor circuit according to a first embodiment

Embodiment of the invention;

Figure 4 shows a motor circuit according to a second

Embodiment of the invention.

Figure 1 shows a schematic representation of the lock of a motor vehicle. A blocking means in the form of a

Rotary latch 3 is rotatable on a movable part of a

Vehicle flap held. At the opposite Closure side is formed a closing wedge 5, in which a recess of the rotary latch 3 can engage when the

Rotary latch 3 is rotated around its bearing. A pawl 4 engages in the rotary latch 3, when the catch 3 in her

Closing position is located.

A closing aid drive 1 is separate from the

Lock arrangement arranged. The drive 1 is over

Coupling means coupled to the rotary latch 3. The drive 1 is then activated when the catch 3 their

Preliminary position reached. This is the case when the user opens the door or flap from the open position into the door

Preshocking presses, wherein the locking wedge 5 comes into engagement with the rotary latch 3 and this transferred to the prelocking position. In this case, the pawl 4 comes into engagement with a catch 3a of the rotary latch 3. Subsequently, the drive 1 causes a force on the coupling means 10 in the

Rotary latch 3, so that the rotary latch 3, the in the figure 1

reached shown locking position. In this case, the pawl 4 falls into the main catch 3b of the rotary latch. 3

In Figure 2, the drive 1 of Figure 1 is shown in more detail. The sub-figures A, B and C show different positions, the DC motor 7 during the

Zuziehbetätigung goes through. FIG. A shows the starting position, FIG. B shows an intermediate position, and FIG. C shows the closing position of the coupling means, which correspond to the blocking position of the locking pawl 3 from FIG.

In this illustration, the motor 7 is designed so that it at power supply and power consumption the

Coupling means consisting of actuating disk 8 and

Bowden cable 9, adjusted. In this example, the motor is equipped with a worm drive. This worm drive is engaged with a ring gear on the actuating disc 8. When driven by the motor 7, the actuating disc 8 is rotated in the direction of arrow 7a and thus we the Bowden cable. 9

withdrawn. The worm drive is designed with the ring gear on the actuating disc 8 as a non-self-locking mating. When returning through the clamping means is thus the worm drive through the actuator disc with a disposed thereon

Sprocket drivable. The actuating disk 8 as part of the coupling means is biased in the position of Figure A, this being achieved by a torsion spring (not shown), which is arranged on the bearing of the actuating disk 8. If the motor 7 is supplied with power, it moves under current consumption in the direction of arrow 7a and rotates the actuating disk 8 in the direction of the arrow 7a. The Bowden cable 9 is characterized

retracted (shortened) and actuates the rotary latch 3. This rotational movement takes place under tension of the torsion spring. If a locking of the rotary latch 3 in the position shown in Figure 1 is performed in the position 7, the power supply of the DC motor 7 is released and the torsion spring forces the actuator disc 8 back from the position C against the direction of arrow 7a in the position A. It drives the

Actuator 8 to the worm drive and the motor 7 is operated as a generator.

FIG. 3 shows a first embodiment of a

Motor circuit for a door lock according to the invention. The

Motor circuit is coupled to the motor 7 of Figure 2 for supply. The circuit has taps for one

Voltage supply, to which a supply voltage Ul opposite a reference potential (eg ground) U0 can be applied. A relay 20 switches the power supply for the motor 7. In series with the motor, a throttle 21 is connected, in parallel to the motor, a capacitor 22 and a varistor 23 are also connected. In series with the motor, a thermistor 24 is connected.

The motor 7 can act indirectly, via the coupling means and the pawl 3 on a Endlageschalter 25. The pawl is in the end position, the voltage supply to the motor 7 is suppressed and the switch 25 is in the position of Figure 3. At the tap Sl, the state of

Switch 25 are queried to control the end position.

Parallel to the motor 7, a protective diode 26 is connected.

If the power supply is interrupted, which is caused by the

Position of the relay 20 is done in Figure 3, then the engine 7 operated by the restoring means temporarily as a generator until the engine and the coupled therewith coupling means were moved back to the starting position. In this process, the polarity of the DC motor 7 changes over the

Motor operation. The diode 26 is permeable and the resistor 27 serves as a load for the motor 7 to prevent over-rotation of the motor 7 in the generator mode. As a result, excessive voltages and Kohlerbbrand the DC motor 7 are reduced. In addition, the noise is reduced.

Figure 4 shows an alternative design, wherein instead of the

Resistor 27, a Zener diode 28 is inserted. This Zener diode is tuned in this example to the motor 7 such that a breakdown voltage of 7 V is provided at the Zener diode 28. If the motor 7 is driven so strongly by the restoring means in the generator mode that the generated voltage is greater than 7 V, the Zener diode causes a voltage limitation or a voltage stabilization. A further revving up of the engine is prevented and the engine is limited to one

Rotational speed led back to its starting position. This reduces the noise of the engine and also avoids high voltage spikes, which can lead to excessive burnup of the coals of the engine.

Claims

claims

1. A door lock for a motor vehicle, comprising a blocking means (3) which is coupled to a DC electric motor (7) for providing a closing aid, wherein the blocking means (3) by the DC motor (7) of a

Vorsperrstellung is movable into a blocking position,

wherein coupling means (8, 9, 12) between the

DC motor (7) and the blocking means (3) are coupled in operative connection, which translate a rotational movement of the DC motor in a blocking movement of the blocking means,

wherein the coupling means (8, 9, 12) between a

Starting position in which the coupling means the

Release locking means and a Zuziehstellung in which the coupling means have brought the locking means in the locked position, are movable,

wherein the DC motor (7) is coupled to the coupling means (8, 9, 12), so that it is the coupling means at powering the DC motor (7) s from the

Initial position transferred to the closing position, wherein mechanical return means are coupled to the coupling means (8, 9, 12) which a biasing force on the

Actuate coupling means in the direction of the starting position, so that the DC motor (7) when voltage supply of the DC motor (7) s the coupling means against the

Preload transferred from the starting position to the closing position,

wherein the mechanical return means, the coupling means (8, 9, 12) at a cancellation of the power supply of the DC motor (7) from the Zuziehstellung in the

Reset home position, wherein the coupling means are coupled to the DC motor (7) such that they transfer the return of the coupling means in a voltage-generating movement of the DC motor (7),

wherein an electrical circuit for controlling the

DC motor (7) is formed, characterized,

in that in the electric circuit for driving the DC motor (7) has a first path with discrete

Components is connected in parallel with the DC motor (7), wherein the first path has at least one protective diode (26) and at least one connected in series discrete component, wherein the discrete component has an ohmic resistance (27) and / or a Zener diode (28) with opposite reverse direction to the protection diode.

2. rear lock according to claim 1, wherein the electrical circuit has a Endlageschalter, which is actuated by the locking means upon reaching the locking position, wherein the Endlageschalter switches the DC motor deenergized when actuated.

3. rear lock according to claim 1 or 2, wherein the discrete component has a Zener diode, which is a

Breakdown voltage between 2 V and 9 V, preferably between 4 V and 8 V.

4. tail lock according to one of the preceding claims, wherein the electrical circuit also comprises at least one varistor in parallel with the DC motor

having.

5. A rear lock according to one of the preceding claims, wherein the electrical circuit comprises at least one thermistor in series with the DC motor.

6. rear lock according to one of the preceding claims, wherein the electrical circuit has at least one choke in series with the DC motor.