KR100877860B1 - Tail gate power latch system of a car - Google Patents

Abstract

A latch system of a car tail gate is provided to improve driving safety by completely closing the tailgate automatically even though a driver does not recognize incomplete closing of the tail gate. An ajar switch(40) is turned off immediately before a pawl(23) is captured by a second holding terminal(22c) according to the rotation of a catch(22). A pawl switch(41) is turned off when the pawl is captured by a first holding terminal(22b) and the second holding terminal. A cinching motor() rotates the catch via a wire in the locking direction. An ECU(Electronic Control Unit) controls the operation of the cinching motor according to on/off signals of the ajar switch and the pawl switch.

Description

Tail gate power latch system of a car

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch system of an automotive tailgate, and more particularly, to a vehicle tailgate that is completely locked by a primary locking when the tailgate is only secondary locking and is not completely locked. A power latch system.

As shown in FIG. 1, the latch 20 is installed at the lower center of the tailgate 10, and the striker 30 is mounted at the rear end of the body floor at a position corresponding thereto, and the tailgate 10 is closed when the tailgate 10 is closed. By inserting / fixing the striker 30 into the latch 20, the tailgate 10 is locked to stably maintain the closed state while driving.

The latch 20 is shown in FIG. 2 (a diagram of a state to which the present invention is applied, but a general latch configuration is applied to describe the same). 22 and the pawl 23 are installed in a state where they can be rotated through the respective fixing pins 24 and 25.

The catch 22 has an accommodating groove 22a for accommodating the striker 30 and maintaining the locked state, and a first catching end 22b and a second catching end 22c to which the pawl 23 is caught. The pawl 23 is provided with a locking end 23a that is caught by the first locking end 22b and the second locking end 22c of the catch 22.

In addition, the fixing pins 24 and 25 are provided with return springs for rotating the catch 22 and the pawl 23 in a state in which the receiving groove 22a is open and in close contact with the catch 22, respectively.

Therefore, when the tailgate 10 is closed, the striker 30 enters the opening 21a of the housing 21 and rotates the catch 22. At this time, the catching end 23a of the pawl 23 catches the catch 22. When moving along the outer circumferential surface of the) and finally caught by the secondary catching end 22c, the striker 30 is accommodated in the receiving groove 22a of the catch 22, so that the rear movement is impossible. The locked state of 10) is maintained (see FIG. 6).

However, when the user closes the tail gate 10, the tail gate 10 may not be closed to a sufficient position due to the reaction force of the air pressure inside the vehicle, and thus the catch 22 may not be fully rotated, thereby causing the pawl 23 to be locked 23a. ) Is not caught by the secondary jamming end 22c as described above, but is caught by the primary jamming end 22b. In this case, when the user does not recognize the incomplete closing of the tailgate 10, The tailgate 10 is driven in a state where it is not completely closed, causing a problem in safety.

The first locking end 22b does not allow the user to push the tailgate 10 to a sufficient position as described above, so that the locking end 23a of the pawl 23 is caught by the secondary locking end 22c. If it fails, the tailgate 10 is opened upward again, so that the user locks the pole 23 downward so as to reduce the closing effort. Even if not supported, it is formed to be locked by the secondary locking position (22b; second lock position) to hold the tail gate 10 so that it can be completely locked by applying a little force again.

However, even though the tailgate 10 is not completely closed by this, even if only the locking by the first locking end 22b is made, the tailgate 10 is not rotated upward and opened so that the user does not open the tailgate 10. Was not fully aware that the vehicle was not completely closed, and driving in such a state often occurred, which was not very desirable in terms of safety.

Therefore, the present invention has been made to solve the above problems, when the tailgate is not completely closed and only one lock is made, the second lock is automatically made so that the tailgate is completely closed to operate the vehicle in a safer state. It is an object of the present invention to provide a power latch system of an automotive tailgate.

The present invention for achieving the above object,

A catch installed to be rotatable inside the housing to receive and fix the striker, and a pawl that is caught by the first catching end and the second catching end formed in the catch according to the degree of rotation of the catch to restrain the catch in the opening direction of the catch. In a tailgate latch system of an automobile,

An ajar switch that is turned off immediately before the pawl is caught by the second catch end according to the rotation of the catch;

A pawl switch which is turned off when the pawl is caught by the first and second catching ends of the catch;

A cinching motor for rotating the catch in the locked direction via a wire;

An electronic control unit (ECU) for receiving the on / off signals of the aza switch and the pole switch, and controlling the operation of the cinch motor according to the signal;

It is configured to further include.

When the aza switch is in the on state and the pole switch is first off, the electronic control unit turns on the new motor after a predetermined delay time (d1) has elapsed since the pole switch is first off. On again and after the aza switch is off, the pole switch is characterized in that the wire is pulled by maintaining the on state of the Cinch motor until the second off time.

Since the exact state of the catch and the pole can be known by the aza switch and the pole switch, when the tailgate is closed, if only one step is made, a separately provided motor is forced to rotate the catch via a wire and automatically moves to the second stage. Locking can be achieved.

Therefore, even when the user does not recognize that the tailgate is not completely closed, the tailgate is automatically closed completely, thereby preventing driving in an incomplete locked state, thereby improving stability.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

2 to 6 are views showing the operating relationship inside the latch 20 from the open state to the fully closed state of the tailgate, and FIG. 7 shows the on / off signals and the cinch of the aza switch and the pole switch at that time. This is a graph of motor operation.

As shown in FIG. 2, the present invention is rotated by a striker 30 entering through the opening 21a of the latch 20 housing 21 to restrain the striker 30 inside the receiving groove 22a. The catch 22 and the side of the catch 22 are attached to the first catching end 22b and the second catching end 22c formed on the outer circumferential surface of the catch 22 according to the amount of rotation of the catch 22. In a latch system having a pawl 23 (a locking end 23a is formed which is directly engaged with the first and second locking ends of the catch), the latch is provided according to the rotational position of the catch 22. The catch 22 is connected to the ajar switch 40 to be turned on / off, the pawl switch 41 to be turned on / off according to the rotational position of the pawl 23, and the wire 22 via 50. A cinching motor rotating in the locking direction;

And an electronic control unit (ECU) for controlling the operation of the cinch motor according to the signals of the aza switch 40 and the pole switch 41.

Here, the end of the cinching motor, the electronic control unit and the wire 50 is wound on a winding wheel mounted on the rotation axis of the cinching motor, the cinching motor itself is any of the outer surface of the housing 21 or inside the tailgate adjacent thereto. The configuration, such as being installed at the position of the degree is easily understood by those skilled in the art and is not shown separately.

Meanwhile, a fan-shaped protrusion end 22d is formed at the right side of the body of the catch 22 in the fully opened state as shown in FIG. 2, and the aza switch 40 is installed adjacent to the protrusion end 22d. do.

When the catch 22 is in the fully open state, the catch 22 is rotated in the locking direction (clockwise) so that the locking end 23a of the pawl 23 catches ( 22 is pressed by the protruding end 22d until it is turned off immediately before being caught by the secondary engaging end 22c of 22).

The upper end of the pawl 23 is formed with an extended end portion 23b, one side of which extends upward, and a pole switch 41 is installed adjacent to the extended end portion 23b.

The pole switch 41 moves only along the outer circumferential surface of the catch 22 of the pawl 23 when it is caught by the first end 22b and the second end 22c. As the 23 is rotated toward the catch 22, the 23 is spaced apart from the extended end 23b, and in other cases, it is pressed by the extended end 23b to maintain the on state.

In the electronic control unit, when the aza switch 40 is in the on state and the time when the aza switch continues to be on after the pole switch 41 is first off, the locking operation of the latch 20 is performed in one step locking. If it is determined that the motor is stopped and the predetermined time delay (d1; set value 36ms) exists after the pole switch 41 is first off, the sinching motor is turned on to start pulling the wire 50. After the pole switch 41 is turned on again and the aza switch 40 is turned off, the wire 50 is continuously pulled by maintaining the operation state of the new motor until the pole switch 41 is second off. . At this time, the operation time of the new motor is set to about 2 seconds or less.

On the other hand, the electronic control unit has a predetermined delay time (d2) after the time when the pole switch 41 is second off, that is, when the new motor is off and the pulling operation of the wire 50 stops as described above. After 100 ms), the latching end 23a of the pawl 23 is moved closer to the secondary end 22c of the catch 22 by releasing the tension state of the wire 50 which is pulled by operating the new motor in the reverse direction. Make sure it is firmly and completely seated. The reverse time is preferably shorter, for example 1.6 seconds or less, than the above 2 seconds in the forward operation time.

On the other hand, one end of the wire 50 is connected to the sinching motor, the other end is directly connected to the catch 22 may be rotated, but as shown in Figure 2 is connected to the closing lever arm 60 is connected to the closing lever arm 60 may cause the catch 22 to rotate.

The closing lever arm 60 is located between the back side of the catch 22, that is, between the catch 22 and the housing 21 (bottom plate), the lower portion of which is rotated by the fixing pin 24 of the catch 22. It is installed to be possible, the connecting portion 61 is connected to the wire 50 is formed on one side of the middle, the closing lever 63 is connected to the upper portion through the connecting pin 62 is rotatably connected.

As shown in FIG. 8, the connecting pin 62 is provided with a spring 64, one end of which is supported by an end of the closing lever arm 60 and the other end of the closing lever 63. It is supported by the support pin 65 which is fixedly penetrated at the end of the, and applies the force which always rotates the closing lever 63 toward the outer peripheral surface of the catch 22 below (clockwise).

Meanwhile, a lower surface of the closing lever 63 is supported by a fixing pin 66 fixed to the housing 21 (the upper plate paired with the bottom plate), and the fixing pin 66 is connected to the spring 64. When the closing lever arm 60 is pulled by the wire 50 by limiting the rotation of the closing lever 63, the end of the closing lever 63 protrudes on the outer circumferential surface of the catch 22. It is a function to make sure it is caught correctly.

The operation of the present invention will now be described.

2 shows a latch 20 state with the tailgate fully open, and the catch 22 is rotated with the receiving groove 22a open to the opening 21a of the housing 21. The locking end 23a of the pawl 23 is in contact with the outer circumferential surface between the first locking end 22b and the detent locking end 22e of the catch 22. In this state, the aza switch 40 and the pole switch 41 are pressed by the protruding end portion 22d and the extended end portion 23b, respectively, and are all on, which corresponds to section A of FIG. 7.

Subsequently, when the catch 22 is rotated clockwise by the entry of the striker 30 as shown in FIG. 3, the locking end 23a of the pole 23 relatively descends on the outer circumferential surface of the catch 22. It is seated on the locking end 22b. When the normal tailgate 10 is completely closed, the locking end 23a of the pawl 23 passes instantaneously without being caught by the first locking end 22b of the catch 22, but closes the tailgate 10. When the power is insufficient, the first lock is made as described above.

At this time, the aza switch 40 is still pressed by the fan-shaped protruding end 22d, and the extended end 23b of the pawl 23 is spaced apart from the pole switch 41 so that the pole switch 41 is turned off. do.

When the one-stage locking state is maintained for a predetermined delay time d1, the sinching motor is turned on by the electronic control unit, and the wire 50 connected to the connecting end 61 of the closing lever arm 60 is pulled. Thus, the closing lever arm 60 is rotated in the clockwise direction so that the closing lever 63 moves to the catching end 22e of the catch 22 and is caught. This section corresponds to section B in FIG.

In this state, as the sinching motor continues to pull the wire 50, as shown in FIG. ) Is turned on again and the aza switch 40 is still in the on state or just before the off state. This section is section C of FIG.

In the state of FIG. 4, the aza switch 40 is turned off instantaneously from the state of FIG. 4, and the pawl switch 41 has the second end of the catch 22 of the catch 23a of the pole 23. By being in the state just before being seated at 22c, it is still in the on state or just before the off state. This section is section D in FIG.

The catch 22 is further rotated by the action of the new motor, which is continued in the state of FIG. 5, so that the engaging end 23a of the pawl 23 rests on the secondary engaging end 22c of the catch 22 as shown in FIG. 6. The pole switch 41 is turned off (secondary off) while being caught, and the operation of the new motor is stopped by the electronic control unit at the same time as the pole switch 41 is turned off. At this time, the aza switch 40 keeps the off state.

The section corresponds to section E in FIG. 7, wherein the new motor is restarted after a predetermined delay time d2 after the pole switch 41 is turned off. The catch 22, which was slightly overturned for two-stage locking by releasing the broken wire 50, could be forced in the opening direction by the return spring, so that the second catch 22c and the pole of the catch 22 (23) The locking state of the locking end 23a is tightened. In this two-stage locking state, the striker 30 is in the correct position, and the path is blocked by the catch 22 and completely restrained in the latch 20, thereby maintaining the tailgate 10 in a completely closed state. This section corresponds to section E of FIG.

According to the present invention as described above, even when the tailgate is closed due to the small amount of force applied by the user or the reaction force of the indoor air pressure is large, the tailgate is not completely closed by the action of the Xinqing motor. The catch is forcibly rotated to achieve two-stage locking so that the tailgate can be completely closed.

Therefore, even if a driver who does not recognize that the tailgate is not completely closed starts driving as it is, the vehicle is prevented from running without the tailgate being completely closed, thereby completely eliminating the possibility of opening the tailgate while driving. Safety is improved.

1 is a view for explaining a positional relationship between a tailgate, a latch, and a striker;

2 to 6 are diagrams showing the operating relationship inside the latch from the open state to the fully closed state of the tailgate, FIG. 2 is a fully open state, FIG. 3 is a one-locking state, and FIGs. 4 and FIG. 5 is an intermediate progress state diagram, Figure 6 is a two-stage locking state diagram,

7 is a graph showing the on / off signal of the aza switch and the pole switch and the operation of the cinch motor during the locking process;

8 is an installation state diagram of a closing lever of one configuration of the present invention.

* Description of the symbols for the main parts of the drawings *

10: tailgate 20: latch

21 housing 22 catch

22a: receiving groove 22b: the first step

22c: secondary jamming end 22d: protruding end

22e: Xin Xing Group 23: Paul

23a: locking end 23b: extension end

24,25: fixed pin 30: striker

40: ajar switch 41: pawl switch

50: wire 60: closing lever arm

61: connecting end 62: connecting pin

63: closing lever 64: spring

65: support pin 66: fixed pin

Claims (7)

delete A catch 22 installed rotatably in the housing 21 to receive and fix the striker 30; A pawl 23 that is caught by the first locking end 22b and the second locking end 22c formed in the catch 22 according to the degree of rotation of the catch 22 and restrains the rotation in the opening direction of the catch 22; ; An aza switch 40 which is turned off immediately before the pawl 23 is caught by the second locking end 22c according to the rotation of the catch 22; A pole switch 41 which is turned off when the pawl 23 is caught by the first catching end 22b and the second catching end 22c of the catch 22; A cinch motor for rotating the catch 22 in the locked direction via a wire 50; When the aza switch 40 is in the on state and the pole switch 41 is first off, the new motor is turned on after the delay time d1 has elapsed from the time when the pole switch 41 is first off. Electronic control to pull the wire 50 by maintaining the on state of the new motor until the pole switch 41 is turned on again and the aza switch 40 is turned off until the pole switch 41 is second off. Unit; Power latch system of the car tailgate comprising a. The method of claim 2, wherein the electronic control unit releases the pulling operation by the wire 50 by operating the new motor in the reverse direction after the delay time d2 elapses after the pole switch 41 is second off. Power latch system of a car tailgate. 3. The pole switch (20) according to claim 2, wherein the aza switch (40) is pressed by a fan-shaped protruding end (22d) formed on an outer circumferential surface of the catch (22) so that the pawl (23) starts from the fully opened state. A power latch system for a vehicle tailgate, characterized in that it is kept on until it is in a state immediately before being caught by the secondary engaging end (22c) of the catch (22). 3. The pole switch 41 of claim 2, wherein the pole switch 41 is pressed by an extension end 23b formed on the pole 23, and the locking end 23a of the pole 23 is connected to the catch 22. The power latch system of a vehicle tailgate, which is turned off by being spaced apart from the extension end (23b) when caught by the vehicle end (22b) and the secondary end (22c). The closing lever arm 60 is rotatably installed on the fixing pin 24 of the catch 22, and the wire 50 is connected to the connecting end 61 formed on the closing lever arm 60. Is connected to the upper end of the closing lever arm 60 is provided with a closing lever 63 is caught on the latching end 22e formed in the catch 22 when the wire 50 is pulled, the wire And 50 is pulled, the catch 22 is rotated in the closing direction. The method of claim 6, wherein the closing lever 63 is rotatably connected to the upper end of the closing lever arm 60 via a connecting pin 62, the connecting pin 62 is connected to the closing lever 63 A spring 64 is provided to rotate toward the catch 22. The lower side of the closing lever 63 is fixed to the housing 21 to move the closing lever 63 when the closing lever arm 60 rotates. The power latch system of a car tailgate, characterized in that the fixing pin (66) is installed so that the closing lever (63) is accurately caught on the latching end (22e) of the catch (22).

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