Motor vehicle door lock with electric child lock function

Abstract

The invention provides a motor vehicle door lock with an electric child lock function, and belongs to the field of electric vehicle door locks, the motor vehicle door lock comprises a shell and a spring bolt which is arranged on the shell and controlled by an unlocking system, the shell is provided with an inward opening unlocking pull rod reset signal switch, an inward opening unlocking pull rod reset signal switch and an unlocking pull rod reset signal switch, the position signal switch is pressed and triggered; the motor transmission system abuts against the inner opening unlocking pull rod reset signal switch or the position signal switch, the situation that the motor transmission system is located at the first position or the second position is recorded through the vehicle control unit, and when the motor transmission system is located at the first position, the door lock is in the unlocking stage; when the motor transmission system is located at the second position, the door lock is in the locking stage. According to the electric child lock, the function of the electric child lock can be achieved through control of a single motor transmission system, arrangement of independent motors and transmission systems is further reduced, integration is achieved through a replaced transmission structure, and compared with a motor and a transmission system additionally arranged in the prior art, cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle door locks, and in particular to a motor vehicle door lock with an electric child lock function. Background Art

[0002] With the development of the automotive market, the demand for automated and intelligent vehicle opening and closing systems has gradually increased, as has the automation and modularization of side doors. Customers' demands for personalization and customization are constantly increasing, further enhancing the operational convenience of the entire vehicle. Traditional mechanical child lock dials or knobs required manual operation, making them inconvenient. At the same time, as users' safety awareness has gradually increased, mechanical child locks are no longer operable in certain scenarios, hindering users' need to open the doors from inside the vehicle in emergencies. Consequently, more and more models are requiring electric child locks to enhance the safety of rear passengers. However, electric child locks currently require independent motors and transmission systems, which increases costs when customers demand these convenience features. Summary of the Invention

[0003] In order to make up for the above shortcomings, the present invention provides a motor vehicle door lock with an electric child lock function, aiming to improve the problem that the electric child lock function in the current market requires an independent motor and transmission system to be implemented, which brings increased costs when customers demand additional convenient functions.

[0004] The present invention is achieved in that:

[0005] The present invention provides a motor vehicle door lock with an electric child lock function, comprising a lock tongue arranged on a housing and controlled by an unlocking system arranged thereon, wherein the housing is provided with:

[0006] The inner unlocking lever resets the signal switch, which is triggered by pressing;

[0007] A position signal switch, which is triggered by pressure;

[0008] The motor drive system presses the inner unlocking lever to reset the signal switch or position signal switch, and the vehicle controller records whether the motor drive system is in position one or position two. When the motor drive system is in position one, the door lock is in the unlocking stage; when the motor drive system is in position two, the door lock is in the locking stage;

[0009] The inner unlocking rod rotates on the housing. When the motor transmission system is in position one, the inner unlocking rod engages with the unlocking system, and the lock tongue is opened as the inner unlocking rod rotates; when the motor transmission system is in position two, the inner unlocking rod is misaligned with the unlocking system, and the lock tongue cannot be opened as the inner unlocking rod rotates.

[0010] Preferably, the unlocking system includes an electric unlocking lever, a pawl release lever and a pawl.

[0011] Preferably, the motor transmission system includes:

[0012] The motor is energized by the door lock electrical component EKT;

[0013] The worm gear transmission system consists of a worm and a sector gear. The sector gear is connected to the housing. The worm is braked by the motor and the worm and the sector gear are meshed.

[0014] The transmission pull rod can slide in the slide groove of the housing along its length direction, and one end is connected to the sector gear. It is provided with a characteristic arc groove, a characteristic axis and an arc surface feature. The arc surface feature triggers the position signal switch;

[0015] The safety lever rotates on the housing and is provided with a U-shaped arc groove that matches the characteristic axis, so that the sliding of the transmission lever stops the rotation of the safety lever, or the rotation of the safety lever stops the sliding of the transmission lever;

[0016] A safety swing rod is fixed on the safety pull rod and is provided with a safety swing rod curved surface;

[0017] The safety transition rod is fixed on the electric unlocking rod, and is provided with a safety transition rod limiting protrusion and a safety transition rod characteristic axis. The safety transition rod characteristic axis is provided on the inner unlocking pull rod with an inner unlocking pull rod engaging protrusion that cooperates with the safety transition rod limiting protrusion; when the safety transition rod characteristic axis is engaged with the inner unlocking pull rod engaging protrusion, the inner unlocking pull rod rotates to drive the safety transition rod to rotate; when the safety transition rod characteristic axis is misaligned with the inner unlocking pull rod engaging protrusion, the inner unlocking pull rod cannot drive the safety transition rod to rotate; the safety rocker rod curved surface limits the rotation of the safety transition rod by limiting the movement of the safety transition rod characteristic axis.

[0018] Preferably, the outer wall of the safety transition rod is provided with a return spring, the two ends of which are respectively connected to the outer wall of the safety transition rod and the electric unlocking rod.

[0019] Preferably, the inner unlocking pull rod is provided with a hole to be pulled.

[0020] Preferably, an inner unlocking pull rod arc is provided at one end of the inner unlocking pull rod, and a characteristic surface for contacting and braking with the inner unlocking pull rod arc is provided on the safety pull rod.

[0021] Preferably, the motor vehicle door lock further comprises:

[0022] The reset signal trigger rod slides in the sliding groove of the cover plate along its length direction, and a special-shaped arc groove is provided at one end of the reset signal trigger rod. The inner unlocking pull rod is provided with an inner unlocking pull rod driving shaft. The inner unlocking pull rod driving shaft slides in the special-shaped arc groove and drives the reset signal trigger rod to slide. The other end of the reset signal trigger rod is provided with a reset signal trigger rod arc surface, which is used to trigger the inner unlocking pull rod reset signal switch.

[0023] Preferably, the inner unlocking pull rod is provided with an inner unlocking pull rod spring around its rotation axis, which is used for returning the inner unlocking pull rod to its original position after rotation.

[0024] Preferably, a blocking edge protrusion is provided on the inner unlocking pull rod to limit the rotational movement of the safety transition rod under the action of the reset spring.

[0025] Preferably, a driving shaft is provided on the sector gear, and the driving shaft cooperates with the characteristic arc groove to drive the transmission rod to slide.

[0026] The beneficial effects of the present invention are:

[0027] After the present invention is locked, by judging the position of the motor transmission system, when it is in position one, the motor transmission system directly switches to position two; when it is in position two, the lock tongue cannot be opened by the inner unlocking rod. At the same time, during the pulling process of the inner unlocking rod, the signal of the motor transmission system jumps twice, and the motor transmission system is driven by the vehicle control logic to move to position one and then to position two.

[0028] After unlocking, when the motor transmission system is in position one, pull the inner unlocking lever to open the lock tongue; when the motor transmission system is in position two, pull the inner unlocking lever once to switch position two to position one, and then pull the inner unlocking lever again to open the lock tongue.

[0029] The present invention can realize the electric child lock function by using a single motor transmission system control, further reducing the independent motor and transmission system settings, and using an alternative transmission structure to achieve integration, which reduces the cost compared with the existing technology that adds motors and transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is the overall structural diagram of the motor transmission system in position one;

[0032] Figure 2 This is the internal structure diagram of the motor transmission system when it is in position one;

[0033] Figure 3 This is the overall front structural view of the motor drive system in position two;

[0034] Figure 4 This is the overall reverse structural view of the motor drive system in position two;

[0035] Figure 5 When the child lock is locked, the internal structure diagram when the inner unlocking lever is in position three;

[0036] Figure 6 When locking the child lock, pull the inner unlocking lever to position five.

[0037] Figure 7 When the child lock is locked, pull the inner unlocking lever to position five, and the connection structure diagram of the inner unlocking lever and the safety transition lever;

[0038] Figure 8 When the child lock is locked, the inner unlocking lever returns to position 4.

[0039] Figure 9 When the child lock is locked, the inner unlocking lever returns to position 4, showing the connection structure between the inner unlocking lever and the safety transition lever;

[0040] Figure 10 Working logic diagram of electric child lock;

[0041] Figure 11 This is the timing diagram corresponding to the position and signal of the inner unlocking lever.

[0042] In the figure: 10, housing; 100, pull rope; 110, safety transition rod; 11Oa, safety transition rod limit protrusion; 110b, safety transition rod characteristic axis; 120, electric unlocking rod; 130, transmission pull rod; 130a, characteristic arc groove; 130b, characteristic axis; 130c, arc surface feature; 140, lock tongue; 150, pawl release rod; 160, pawl; 170, reset spring; 180, third axis; 190, inner unlocking pull rod spring; 200, cover plate; 20, door lock electrical component EKT; 20a, inner unlocking pull rod Rod reset signal switch; 20b, position signal switch; 30, motor; 40, worm; 50, sector gear; 50a, drive shaft; 60, reset signal trigger rod; 60a, special-shaped arc groove; 60b, reset signal trigger rod arc surface; 70, inner unlocking pull rod; 70a, inner unlocking pull rod engagement protrusion; 70b, inner unlocking pull rod drive shaft; 70c, inner unlocking pull rod arc; 70d, blocking edge protrusion; 80, safety pull rod; 80a, U-shaped arc groove; 80b, characteristic surface; 90, safety rocker; 90a, safety rocker curved surface. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] Example

[0045] First, in the prior art, the lock tongue 140 of the car door lock is controlled by an unlocking system. In some embodiments, the unlocking system is a conventional means, specifically, it includes an electric unlocking lever 120, a pawl release lever 150 and a pawl 160, that is, through the rotation of the electric unlocking lever 120 and the coordinated transmission of the pawl release lever 150 and the pawl 160, the brake lock tongue 140 rotates. When the lock tongue 140 rotates, the car door lock is unlocked.

[0046] Based on the working process of the lock tongue 140 of the car door lock, the present invention improves the implementation method of the electric child lock function. Specifically, in the locking stage and the unlocking stage, the driving method of the electric unlocking lever 120 is improved. The improved method is explained from the locking and unlocking working logic. The working logic description diagram can be referred to Figure 10 , which is divided into the vehicle child lock locking logic and the vehicle child lock unlocking logic.

[0047] First, when the vehicle's child lock is locked, its working logic is as follows:

[0048] After the vehicle receives the child lock lock command, the vehicle control logic first determines the position status of the door lock motor drive system, and further determines the signal status of the position signal switch 20b and the inner unlocking lever reset signal switch 20a to confirm whether the motor drive system is in position 1 or position 2. Figure 1 and Figure 2 It is shown that, preferably, the vehicle controller is connected to the door lock electrical component EKT20 through the vehicle wiring harness to energize the motor 30 in the forward direction, the motor 30 drives the worm 40, and the worm 40 drives the sector gear 50 (the sector gear 50 rotates around the first axis and is connected to the housing 10), forming a worm gear transmission system with the worm.

[0049] Based on the worm gear transmission system, it drives the transmission rod 130 in Figure 2 , the safety lever 80 moves to the left in the direction shown in FIG. 1 (achieved by the linkage between the drive shaft 50 a on the sector gear 50 and the characteristic arc groove 130 a on the transmission lever 130 ), and the transmission lever 130 drives the safety lever 80 to rotate clockwise around the second axis (the second axis is a feature of the housing 10 , according to FIG. 1 ). Figure 4 The characteristic shaft 130b on the middle transmission rod 130 and the characteristic U-shaped arc groove 80a on the safety rod 80 are linked together), the safety rod 80 drives the safety rocker bar 90 to rotate, and at the same time, when the transmission rod 130 moves, its arc surface feature 130c presses the trigger position signal switch 20b, and the signal jump is fed back to the vehicle controller. The controller records that the motor transmission system is in position 2, and the vehicle child lock locking logic control and door lock complete the child lock locking operation.

[0050] When the vehicle is locked with the child lock, Figure 5 As shown, the inner unlocking pull rod driving shaft 70b on the inner unlocking pull rod 70 and the special-shaped arc groove 60a on the reset signal trigger rod 60 are connected at the bottom of the groove, the inner unlocking pull rod reset signal switch 20a is in an uncompressed state, and the reset signal is not triggered.

[0051] When the vehicle is locked with the child lock, Figure 3 As shown, the safety swing rod 90 is provided with a safety swing rod curved surface 90a, and the safety transition rod 110 is provided with a safety transition rod characteristic axis 11ob, which is limited by the safety swing rod curved surface 90a. Figure 3 In the position shown, the safety transition rod limiting protrusion 110a cannot engage with the inner unlocking pull rod engaging protrusion 70a.

[0052] In addition, when the inner unlocking rod 70 is pulled, it is divided into three positions, namely position three, position four and position five, among which position three is the initial position of the inner unlocking rod 70, position four is the position where the inner unlocking rod 70 triggers the position signal switch 20b, and position five is the final end position of the inner unlocking rod 70, that is, position four is between position three and position five.

[0053] When the inner unlocking rod 70 starts to rotate around the third axis 180 from position three, it cannot drive the safety transition rod 110 to work (because the safety transition rod limiting protrusion 110a cannot engage with the inner unlocking rod engagement protrusion 70a), and thus cannot drive the unlocking system composed of the electric unlocking rod 120, the pawl release rod 150 and the pawl 160, that is, the lock tongue 140 cannot be opened.

[0054] When the vehicle is in the child lock locked state, the inner unlocking pull rod 70 is pulled, driving the reset signal trigger rod 60 to slide in the sliding groove of the cover plate 200 along its length direction, wherein the cover plate 200 is the existing technology, and the reset signal rod 60 will be driven to slide to the right (according to the linkage matching relationship between the special-shaped arc groove 60a and the inner unlocking pull rod drive shaft 70b, which can be referred to Figure 8 ).

[0055] When the inner unlocking lever 70 is pulled to position 4, refer to Figure 8 and Figure 9 The reset signal trigger rod arc surface 60b triggers the reset signal switch 20a, causing the reset signal to jump; at the same time, during the pulling process of the inner unlocking pull rod 70, the safety pull rod 80 is pushed to rotate counterclockwise (based on the characteristic surface 80b on the safety pull rod 80 driven by the inner unlocking pull rod arc 70c of the inner unlocking pull rod 70).

[0056] When the safety lever 80 rotates counterclockwise:

[0057] On the one hand, the driving rod 130 is pushed to slide to the right (eg Figure 6 As shown, the basis for cooperation is: Figure 4 The characteristic shaft 130b and the U-shaped arc groove 80a shown in the figure are linked together to move the motor transmission system to position 1. At the same time, the arc surface feature 130c compresses the position signal switch 20b, so that the position signal of the motor transmission system is triggered and a signal jump occurs;

[0058] On the other hand, the safety lever 80 drives the safety swing lever 90 to rotate counterclockwise, and the safety swing lever 90 cancels the position restriction on the safety transition lever 110 (according to Figure 3 The associated cooperation between the middle safety rocker surface 90a and the safety transition rod characteristic axis 11ob).

[0059] The safety transition rod 110 rotates counterclockwise under the action of the reset spring 170, and is limited by the stop edge protrusion 70d on the inner unlocking pull rod 70 during the reset rotation process (such as Figure 7 shown).

[0060] When the inner unlocking lever 70 is pulled to position five, it starts to rotate clockwise and reset under the action of the inner unlocking lever spring 190. Figure 8 and 9 As shown, during the reset process of the inner unlocking lever 70, the reset signal triggering lever 60 will be driven to slide to the left (as shown in FIG. Figure 8 As shown in the figure, the movement process is based on the linkage effect of the special-shaped arc groove 60a and the inner unlocking pull rod driving shaft 70b. The reset signal trigger rod 60 slides to the left, which causes the reset signal trigger rod arc surface 60b to no longer compress the inner unlocking pull rod reset signal switch 20a, and the reset signal jumps again.

[0061] Based on the above movement process, after the vehicle controller receives two jumps of the position signal switch 20b and judges the position signal of the motor transmission system, it drives the motor transmission system to position one. The vehicle controller energizes the motor 30 in the forward direction according to the logical setting, and the motor transmission system moves from position one to position two.

[0062] It should be noted that a key point in the process of the motor 30 being powered on by the vehicle controller and starting to work is that the inward-opening safety transition rod 110 is still restricted by the blocking edge protrusion 70d, and there is still a restricted distance, so that during the operation of the motor 30, the safety transition rod limiting protrusion 110a and the inward-opening unlocking pull rod engaging protrusion 70a are always kept in a state of being unable to engage.

[0063] When the vehicle child lock is in the locked state, when the inner unlocking lever 70 is pulled, the system repeats the above-described inner unlocking lever 70 from position three to position five, the motor drive system to position one, the inner unlocking lever 70 to position four and the reset signal jump action (refer to Figure 10 ), so that the motor drive system always remains in position 2, that is, the car door cannot be opened by pulling the inner unlocking rod 70.

[0064] Secondly, when the vehicle's child lock receives the child lock unlock command, its working logic is as follows:

[0065] The vehicle control logic first determines the signal status of the motor transmission system position signal switch 20b in the door lock, that is, confirms that the motor transmission system is in position one or position two. If it is in position one, pull the inner unlocking rod 70 to drive the related parts of the unlocking system and open the lock tongue 140, that is, open the door.

[0066] When the motor drive system is confirmed to be in position 2, the vehicle controller preferably connects to the door lock electrical component EKT20 via the vehicle wiring harness to reversely energize the motor 30, driving the motor drive system from position 2 to position 1. In some embodiments, the motor drive system can also be optionally driven from position 2 to position 1 by pulling the inner unlocking lever 70.

[0067] Finally, the relative timing relationship between the position of the inner unlocking lever 70, the inner unlocking lever reset signal switch 20a and the motor drive system signal is shown in FIG. Figure 11 .

[0068] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0069] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A motor vehicle door lock with an electric child lock function, comprising a lock tongue (140) arranged on a housing (10) and controlled by an unlocking system arranged thereon, characterized in that: The housing (10) is provided with: An inner unlocking pull rod reset signal switch (20a) which is triggered by being pressed; A position signal switch (20b), which is triggered by pressure; The motor drive system presses against the inner unlocking pull rod reset signal switch (20a) or the position signal switch (20b), and the vehicle controller respectively records whether the motor drive system is in position one or position two. When the motor drive system is in position one, the door lock is in the unlocking stage; when the motor drive system is in position two, the door lock is in the locking stage. The inner unlocking pull rod (70) is rotated on the housing (10). When the motor transmission system is in position one, the inner unlocking pull rod (70) is engaged with the unlocking system, and the lock tongue (140) is opened as the inner unlocking pull rod (70) rotates; when the motor transmission system is in position two, the inner unlocking pull rod (70) is misaligned with the unlocking system, and the lock tongue (140) cannot be opened as the inner unlocking pull rod (70) rotates.

2. A motor vehicle door lock with an electric child lock function according to claim 1, characterized in that: The unlocking system includes an electric unlocking lever (120), a pawl release lever (150) and a pawl (160).

3. A motor vehicle door lock with an electric child lock function according to claim 2, characterized in that: The motor transmission system comprises: The motor (30) is energized by the door lock electrical component EKT (20); The worm gear transmission system is composed of a worm (40) and a sector gear (50), wherein the sector gear (50) is connected to the housing (10), the worm (40) is braked by the motor (30), and the worm (40) and the sector gear (50) are meshed; A transmission pull rod (130) is slidable in a slide groove of the housing (10) along its length direction, one end of which is connected to the sector gear (50), and is provided with a characteristic arc groove (130a), a characteristic shaft (130b) and an arc surface feature (130c), wherein the arc surface feature (130c) triggers a position signal switch (20b); The safety lever (80) is rotated on the housing (10) and is provided with a U-shaped arc groove (80a) that matches the characteristic shaft (130b), so that the transmission lever (130) slides to brake the safety lever (80) to rotate, or the safety lever (80) rotates to brake the transmission lever (130) to slide; A safety swing rod (90) is fixed on the safety pull rod (80) and is provided with a safety swing rod curved surface (90a); The safety transition rod (110) is fixed on the electric unlocking rod (120), and is provided with a safety transition rod limiting protrusion (110a) and a safety transition rod characteristic axis (110b); the inner unlocking pull rod (70) is provided with an inner unlocking pull rod engaging protrusion (70a) that cooperates with the safety transition rod limiting protrusion (110a); when the safety transition rod limiting protrusion (110a) is engaged with the inner unlocking pull rod engaging protrusion (70a), the inner unlocking pull rod (70) rotates to drive the safety transition rod (110) to rotate; when the safety transition rod limiting protrusion (110a) and the inner unlocking pull rod engaging protrusion (70a) are misaligned, the rotation of the inner unlocking pull rod (70) cannot drive the safety transition rod (110) to rotate; the safety rocker rod curved surface (90a) limits the rotation of the safety transition rod (110) by limiting the movement of the safety transition rod characteristic axis (110b).

4. A motor vehicle door lock with an electric child lock function according to claim 3, characterized in that: The outer wall of the safety transition rod (110) is provided with a reset spring (170), the two ends of which are respectively connected to the outer wall of the safety transition rod (110) and the electric unlocking rod (120).

5. The motor vehicle door lock with electric child lock function according to claim 1, characterized in that: The inner unlocking pull rod (70) is provided with a pulled hole, and the hole is braked by a pull rope (100).

6. The motor vehicle door lock with electric child lock function according to claim 3, characterized in that: An inner unlocking pull rod arc (70c) is provided at one end of the inner unlocking pull rod (70), and a characteristic surface (80b) for contacting and braking the inner unlocking pull rod arc (70c) is provided on the safety pull rod (80).

7. The motor vehicle door lock with an electric child lock function according to claim 1, characterized in that: The motor vehicle door lock further comprises: The reset signal trigger rod (60) slides in the sliding groove of the cover plate along its length direction, and one end of the reset signal trigger rod is provided with a special-shaped arc groove (60a). The inner unlocking pull rod (70) is provided with an inner unlocking pull rod driving shaft (70b). The inner unlocking pull rod driving shaft (70b) slides in the special-shaped arc groove (60a) and drives the reset signal trigger rod (60) to slide. The other end of the reset signal trigger rod (60) is provided with a reset signal trigger rod arc surface (60b) for triggering the inner unlocking pull rod reset signal switch (20a).

8. The motor vehicle door lock with electric child lock function according to claim 7, characterized in that: The inner unlocking pull rod (70) is provided with an inner unlocking pull rod spring (190) around its rotation axis, and is used for resetting the inner unlocking pull rod (70) after rotation.

9. The motor vehicle door lock with electric child lock function according to claim 4, characterized in that: The inner unlocking pull rod (70) is provided with a blocking edge protrusion (70d) for limiting the rotational movement of the safety transition rod (90) under the action of the reset spring (170).

10. The motor vehicle door lock with electric child lock function according to claim 3, characterized in that: A driving shaft (50a) is provided on the sector gear (50), and the driving shaft (50a) cooperates with the characteristic circular arc groove (130a) to drive the transmission pull rod (130) to slide.

Images