Motor vehicle latch
The motor vehicle latch addresses the issue of inaccurate gear positioning due to inertia by using a gear system with cooperating stoppers and a cam mechanism, ensuring precise operation and additional locking functions.
Patent Information
- Application Number
- PCT/CN2024/137096
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-12-05
- Filing Date
- 2024-12-05
- Publication Date
- 2025-06-12
AI Technical Summary
Existing motor vehicle door latches face challenges in accurately returning to the initial position due to inertia, especially when using mechanical or electrical drive systems like worm and worm gear transmission.
The proposed motor vehicle latch incorporates a power drive device with a gear system featuring a first stopper and a second stopper that cooperate to ensure accurate gear positioning, along with a cam and release lever mechanism to manage the latch's operational states.
This design enables the gear to accurately stop in the initial position, maintaining the latch's functionality while preventing unintended movements, and allows for additional functions like child protection locking or double pull locking.
Smart Images

Figure CN2024137096_12062025_PF_FP_ABST
Abstract
Description
MOTOR VEHICLE LATCHTechnical Field
[0001] The present application relates to the technical field of vehicles, and in particular to a motor vehicle latch.Background Art
[0002] In side door latches of motor vehicles, a catch and a locking bolt inserted into the catch are generally provided. The catch and a pawl are mounted on one of a door frame and a door of a vehicle body, and the locking bolt is mounted on the other of the door frame and the door. A drive device may be used to lock the catch with the locking bolt by means of the pawl by so as to lock the door to the vehicle body, and the drive device may be used to move the pawl to rotate the catch so that the catch can be disengaged from the locking bolt to unlock the door from the vehicle body.
[0003] In the prior art, the drive device may be implemented by mechanical or electrical drive. For example, the drive device takes the form of a worm and worm gear transmission system, which rotates the pawl by means of the transmission of a worm and a worm gear and resets a gear by means of a reset piece such as a spring. However, due to the force generated by the sealing of the door, the spring will lose part of the force used to release the pawl.
[0004] In order to solve this problem, there is also a structure in the prior art in which the gear is reset directly by the worm and worm gear transmission system, without using a spring. However, in this structure, when a motor resets the gear, it is often difficult for the gear to accurately stop in the initial position due to the inertia of movement.Summary
[0005] An objective of the present application is to solve at least one of the above problems and / or other problems in the prior art.
[0006] To achieve the above object, the present application provides a motor vehicle latch, comprising: a pawl for cooperating with a catch;
[0007] a release lever for actuating the pawl; and
[0008] a power drive device used for rotating the release lever around an axis and comprising a gear on which a first stopper is arranged, wherein
[0009] a second stopper is provided to radially offset a part of the first stopper when the power drive device works and rotates the gear.
[0010] According to an improvement of the present application, a cam is arranged on one side of the gear, and the cam abuts against the release lever, and the first stopper is arranged on the other side of the gear.
[0011] According to an improvement of the present application, a release lever pressing spring is provided to apply a force towards the cam on the release lever.
[0012] According to an improvement of the present application, the first end of the first stopper is fixed to the gear, and the second end has a first protrusion and can move in the radial direction relative to the first end, and the second stopper has a second protrusion which can contact with the first protrusion during the rotation of the gear.
[0013] According to an improvement of the present application, the first protrusion and / or the second protrusion are angular protrusions.
[0014] According to an improvement of the present application, the gear has a reset piece mounting part for mounting a reset piece, and the reset piece is arranged on the reset piece mounting part, and the force applied to the gear by the reset piece to rotate the gear cannot drive the first stopper past the second stopper.
[0015] According to an improvement of the present application, a circumferential stopper is provided, two side walls of which can completely stop the gear from rotating in both directions respectively.
[0016] According to an improvement of the present application, the gear can be in a first position, a second position and a third position, and in the first position the first stopper abuts against the second stopper;
[0017] when the gear rotates in a first direction and is blocked by a side wall of the circumferential stopper, the gear is in the second position; and
[0018] when the gear rotates in a second direction and is blocked by the other side wall of the circumferential stopper, the gear is in the third position.
[0019] According to an improvement of the present application, when the gear rotates from the first position to the second position, the motor vehicle latch performs a power release function; and
[0020] when the gear rotates from the first position to the third position, the motor vehicle latch performs a child protection locking function or a double pull locking function.
[0021] According to an improvement of the present application, the cam arranged on the gear has a first part, of which the profile is an arc; and when the gear rotates between the first position and the third position, the arc contacts with the release lever.
[0022] As can be seen from the above, the present application proposes a motor vehicle latch provided with a first stopper and a second stopper which cooperate with each other. The resistance of the first stopper and the second stopper in the circumferential direction will not affect the normal function of the latch, but can make the gear accurately stop in the initial position due to the resistance of mutually cooperating blocking members when the lock is not working.
[0023] Other features and advantages of the present application are described in detail below with reference to the accompanying drawings.Brief Description of the Drawings
[0024] Features and advantages of the present application will be clearly understood from the detailed description provided below with reference to the accompanying drawings. It should be understood that the following accompanying drawings are only schematic and not necessarily drawn to scale, and therefore cannot be regarded as limiting the present application. In the figures:
[0025] FIG. 1 shows a perspective view of a motor vehicle latch according to an embodiment of the present application.
[0026] FIG. 2 shows a perspective view of the side of a gear provided with a first stopper.
[0027] FIG. 3 shows a perspective view of a stop piece.
[0028] FIG. 4 shows a perspective view of the gear and a second stopper assembled together.
[0029] FIGS. 5 (a) and 5 (b) show state diagrams of a cam in a first state and in a second state, respectively.
[0030] FIGS. 6 (a) , 6 (b) and 6 (c) show front views of the gear of the present application in a first position, in a second position and in a third position, respectively.Detailed Description of Embodiments
[0031] Embodiments of the present application are described below with reference to the drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present application. However, it will be obvious to those skilled in the art that the present application may be implemented without some of these specific details. In addition, it should be understood that the present application is not limited to the particular embodiments described. Instead, it is contemplated that the present application can be implemented by any combination of the features and elements described below, regardless of whether they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered as elements or limitations of the claims, unless otherwise explicitly recited in the claims.
[0032] The terms such as "first" and "second" are used below to describe elements in the present application, and these terms are only used to distinguish the individual elements and are not intended to limit the nature, order or number of these elements. The terms "comprising" and "having" are used to denote an open-ended inclusion and mean that there may be additional elements / components in addition to the listed elements / components.
[0033] Specific embodiments of a motor vehicle latch are described below with reference to the accompanying drawings. It should be noted that the motor vehicle latch of the present application is preferably a motor vehicle door latch, and in a specific embodiment, a door latch of a rear side door of a motor vehicle is described in detail as an example. However, the motor vehicle latch within the scope of the present application can also be used for latches of other functions, such as a front hood latch, a trunk latch, etc. of the motor vehicle. Therefore, the term “motor vehicle latch” herein may be interpreted in a broad sense.
[0034] FIG. 1 shows a motor vehicle latch according to an embodiment of the present application. As shown in FIG. 1, the motor vehicle latch according to this embodiment may comprise a housing not shown and a drive assembly arranged in the housing. The drive assembly comprises a motor 1, a worm 2 fixedly connected to an output shaft of the motor, a gear 3 meshing with the worm 2, and a cam 4 arranged on the gear 3. A release lever 5 contacts and cooperates with the cam 4. A part of the release lever 5 contacts with the cam 4 and the other part contacts with a pawl lifting lever 6. The pawl 7 and the pawl lifting lever 6 are fixed so that they can rotate together.
[0035] It will be appreciated by those skilled in the art that the gear 3 may be in the form of a worm gear, a helical gear, etc. The cam 4 and the gear 3 are fixed, for example, they may be integrally formed.
[0036] In this way, when the motor 1 rotates, the worm 2 rotates the gear 3 and can simultaneously rotate the cam 4. A working part of the cam 4 rotates the release lever 5, and the release lever 5 then rotates the pawl lifting lever 6 and the pawl 7, thereby achieving different working states of the latch.
[0037] Further shown in FIG. 1 is a release lever pressing spring 8. The release lever pressing spring 8 is in the form of a torsion spring, of which one end is fixedly connected to the release lever 5 and the other end may be connected to a fixed component. In this way, the release lever pressing spring 8 always applies a force to the release lever 5, and this force presses the release lever 5 towards the cam 4.
[0038] When the motor rotates to a predetermined angle in one direction, a certain function can be realized, such as power release of the latch. When the motor rotates to a predetermined angle in the other direction, another function can be realized, such as child protection or double pull operation. However, as described in the background art section, when the motor needs to return to the initial position after realizing the power release, it cannot be accurately returned to the initial position due to a certain inertia. To this end, the present application proposes the following improvements.
[0039] FIG. 2 shows a perspective view of the side of the gear provided with a first stopper. As can be seen with reference to FIGS. 1 and 2, the cam 4 is provided on one side of the gear 3, and a reset piece mounting part and the first stopper are provided on the other side of the gear 3. Specifically, the reset piece mounting part 31 is used for mounting a reset piece. The reset piece here is preferably in the form of a torsion spring in order to rotate the gear 3. To this end, the reset piece mounting part 31 is provided in the form of an annular wall extending axially away from the cam from the middle of the gear 3, and the circumferential length thereof is adapted to the size of the reset piece mounted. The first stopper 32 is arranged in a position on the same circumference as the reset piece mounting part 31. The first stopper also extends axially away from the cam from the middle of the gear 3, and the circumferential dimension thereof is significantly smaller than the circumferential dimension of the reset piece mounting part 31. The first stopper 32 is provided with a radially inward first protrusion 321 at its end axially away from the cam. The first stopper 32 has a certain elasticity so that when subjected to a force, the end can move radially with respect to the bottom end closer to the cam. The function of the first stopper 32 will be explained below in connection with the other components.
[0040] FIG. 3 shows a perspective view of a stop piece. As can be seen from FIG. 3, the stop piece 9 comprises a body which is substantially plate-shaped. A circumferential stopper 91 is provided on the body, for example, on the outer side of the body. A second stopper 92 is provided inside the profile of the body so as to cooperate with the first stopper 32. Specifically, the second stopper 92 has a second protrusion. The stop piece 9 is stationary with respect to a fixed component, for example, may be fixed to the housing, or is formed directly on the housing in an integrally formed manner.
[0041] FIG. 4 shows a perspective view of the gear and the second stopper assembled together. When the mounting of the gear 3 and the stop piece 9 is completed, the first protrusion 321 of the first stopper 32 is in the same axial position as the second protrusion, as shown in FIG. 4. That is, during the rotation of the gear 3, when the first protrusion 321 of the first stopper is rotated to contact with the second protrusion of the second stopper, a certain resistance is generated between the first protrusion 321 and the second protrusion, to prevent rotation of the gear. However, since the first stopper 32 has a certain elasticity, its end can be radially displaced, so that depending on the magnitude of the force to which it is subjected, the rotation of the gear may be prevented, or the rotation of the gear may continue after the first stopper 32 is radially offset against this resistance.
[0042] Furthermore, since the stop piece 9 is stationary with respect to the fixed component, the circumferential stopper 91 acts as a stopper for the gear 3 in the circumferential direction. That is, the gear 3 cannot continue to rotate after encountering the circumferential stopper 91. As can be seen from FIG. 3, since the circumferential stopper 91 has two side walls in the circumferential direction, it is possible to provide a stop for the gear 3 in both rotation directions. A component for cooperating with the circumferential stopper 91 may be provided on the gear 3, and may have a certain elasticity so as to provide a certain cushioning capacity while providing a stop.
[0043] As a further improvement of the present application, the shape of the cam is further set in the present application. In particular, referring to FIGS. 5 (a) and 5 (b) , FIG. 5 (a) shows a view of the cam in a first state and FIG. 5 (b) shows a view of the cam in a second state. The profile of the cam is set such that the profile of a first part thereof is part of a circle and the profile of a second part thereof is a radially increasing part. In this way, when the first part of the cam contacts with the release lever 5, although the cam rotates, since its profile is circular, the release lever 5 is not pushed; and when the second part of the cam contacts with the release lever 5, the rotation of the cam will push the release lever 5 to rotate.
[0044] The working process of the door latch of the present application will be described below with reference to FIGS. 6 (a) , 6 (b) and 6 (c) . FIGS. 6 (a) , 6 (b) and 6(c) show front views of the gear of the present application in a first position, in a second position and in a third position, respectively. In FIG. 6 (a) , the gear 3 is in the first position, which may also be referred to as the initial position, in which the door latch may be in a locked state. Subsequently, the motor drives the worm and in turn rotates the gear clockwise until the gear is stopped by one of the side walls of the circumferential stopper 91, thus reaching the second position shown in FIG. 6 (b) . During the rotation from the first position to the second position, the power release of the door latch can be realized.
[0045] Subsequently, the gear needs to be rotated counterclockwise to return to the first position. However, as mentioned above, due to a certain inertia of movement, the motor cannot accurately drive the gear back to the first position. To this end, the motor drives the gear to rotate counterclockwise and move directly to the third position shown in FIG. 6 (c) . In the third position, the rotation of the gear cannot continue because it is stopped by the other side wall of the circumferential stopper 91.Subsequently, the motor is de-energized and the motor no longer provides the drive force for the gear.
[0046] In the working process described above, during the movement from the first position to the second position, the first protrusion 321 of the first stopper contacts with the second protrusion of the second stopper in one direction and is subjected to a resistance from the second protrusion, but the gear can continue to rotate against this resistance due to the force generated by the motor, so that the gear can continue to rotate to the second position. Likewise, during the rotation of the gear from the second position to the third position counterclockwise, the first protrusion 321 of the first stopper contacts with the second protrusion of the second stopper in the other direction and is subjected to the resistance from the second protrusion, but the gear can continue to rotate against this resistance due to the force generated by the motor, so that the gear can continue to rotate to the third position. After the third position has been reached and the motor is de-energized, the gear 3 is rotated from the third position to the first position under the action of the reset piece until the first protrusion 321 contacts with the second protrusion of the second stopper again in one direction. However, since the first protrusion 321 of the first stopper and the second protrusion of the second stopper are configured such that the gear can overcome the resistance therebetween under the drive of the motor, but the gear cannot overcome the resistance therebetween under the action of the reset piece, so that the gear cannot continue to rotate, and then can stay in the first position accurately.
[0047] During the counterclockwise rotation of the gear from the first position to the third position, the door latch can perform other functions, such as a child protection locking or double pull locking function.
[0048] As a preferred implementation of the present application, the first protrusion 321 may be provided as an angular protrusion having two sides, and correspondingly, the second protrusion is also provided as an angular protrusion having two sides. Further, the first protrusion may be configured such that its two sides are equal, and the second protrusion may be configured to have one long side and one short side, so that the protrusion slopes in the circumferential direction are different, and the forces required to deform the first protrusion 321 when rotating in different directions are different.
[0049] In addition, in the above description of the working process with reference to FIGS. 6 (a) , 6 (b) and 6 (c) , and in connection with the preferred structure of the cam in FIGS. 5 (a) and 5 (b) , it is possible to cause the first part of the cam to contact with the release lever when the gear rotates between the first position and the third position, thereby reducing the resistance of the reset piece, and enabling the gear to reliably return to the first position. Furthermore, in the working process of the door latch, the release lever pressing spring 8 always presses the release lever 5 towards the cam, so that the release lever is in a stable state without shaking, and its force can also help the gear return to the first position.
[0050] Various modifications and variations of the embodiments disclosed above may be made to those skilled in the art without departing from the scope or spirit of the present application. Other embodiments of the present application are apparent to those skilled in the art from the practice of the present application disclosed in this description. This description and the examples disclosed therein are to be regarded as exemplary only, and the true scope of the present application is specified by the appended claims and their equivalents.
Claims
1.A motor vehicle latch comprising:a pawl (7) for cooperating with a catch;a release lever (5) for actuating the pawl (7) ; anda power drive device used for rotating the release lever (5) around an axis and comprising a gear (3) on which a first stopper (32) is arranged;characterized in that,a second stopper (92) is provided to radially offset a part of the first stopper (32) when the power drive device works and rotates the gear (3) .2.The motor vehicle latch according to claim 1, characterized in thata cam (4) is arranged on one side of the gear (3) , and the cam (4) abuts against the release lever (5) , and the first stopper (32) is arranged on the other side of the gear (3) .3.The motor vehicle latch according to claim 2, characterized in thata release lever pressing spring (8) is provided to apply a force towards the cam (4) on the release lever (5) .4.The motor vehicle latch according to any of claims 1 to 3, characterized in thatthe first end of the first stopper (32) is stationary with respect to the gear (3) , and the second end has a first protrusion (321) and can move in the radial direction relative to the first end, and the second stopper has a second protrusion which can contact with the first protrusion during the rotation of the gear.5.The motor vehicle latch according to claim 4, characterized in thatthe first protrusion and / or the second protrusion are angular protrusions.6.The motor vehicle latch according to any of claims 1 to 3, characterized in thatthe gear (3) has a reset piece mounting part for mounting a reset piece, and the reset piece is arranged on the reset piece mounting part, and the force applied to the gear by the reset piece to rotate the gear cannot drive the first stopper (32) past the second stopper (92) .7.The motor vehicle latch according to any of claims 1 to 3, characterized in thata circumferential stopper (91) is provided, two side walls of which can completely stop the gear from rotating in both directions respectively.8.The motor vehicle latch according to claim 7, characterized in thatthe gear can be in a first position, a second position and a third position, and in the first position the first stopper (31) abuts against the second stopper (92) ;when the gear rotates in a first direction and is blocked by a side wall of the circumferential stopper (91) , the gear is in the second position; andwhen the gear rotates in a second direction and is blocked by the other side wall of the circumferential stopper (91) , the gear is in the third position.9.The motor vehicle latch according to claim 8, characterized in thatwhen the gear rotates from the first position to the second position, the motor vehicle latch performs a power release function;when the gear rotates from the first position to the third position, the motor vehicle latch performs a child protection locking function or a double pull locking function.10.The motor vehicle latch according to claim 8 or 9, characterized in thatthe cam (4) arranged on the gear has a first part, of which the profile is an arc; and when the gear rotates between the first position and the third position, the arc contacts with the release lever.
Citation Information
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