Double cam single pendulum rod compliant linkage combination mechanism and its construction

Abstract

The application discloses a kind of electric suction vehicle door locks of double cam single pendulum rod compliant linkage combination mechanism structure, which combines the component features of limiting block, cam intermittent motion, profile mutation, realizes three kinds of movement modes of compliant rolling and sliding, rigid stirring and swing avoidance and switching between each mode;It is structured as a suction support chain of automobile side door lock, including swing cam mechanism, spring compliant linkage mechanism, specifically composed of suction drive rod, ratchet, swing push rod, cable, opening cam, pawl, compression reset spring and the like, the suction drive rod is coaxially installed with the ratchet, the swing push rod is installed with suction roller in contact with the ratchet at the end, the external suction motor drives the cable to pull the drive rod of compliant linkage mechanism, combined with torsional spring, limiting block and profile to realize the electric suction function of vehicle door lock;Opening cam is coaxially linked with pawl, opening roller is installed on swing push rod and in contact with opening cam, to realize compliant avoidance of drive rod, drive opening cam, to realize opening priority function.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive engineering, specifically relating to an electric suction door lock for automobiles with a double cam single rocker arm compliant linkage combination mechanism and its structure. Background Technology

[0002] With the development of intelligent technology, people's pursuit of intelligent vehicles is also increasing, and developing intelligent car door locks with multiple functions is one aspect of this. High-end car door locks often have multi-functional electric opening chains and electric closing chains, which can realize a certain degree of automatic opening and closing of the car door lock, i.e., self-closing door locks. These self-closing door locks usually include a lock body, electric actuator, unlocking mechanism, etc. When the car door is not fully closed, i.e., in a half-locked state, it can automatically close the door lock from the half-locked position to the fully locked position, thereby ensuring that the car door is in a safe closed state.

[0003] Currently, many door lock manufacturers and research institutions are developing electric self-closing mechanisms for automotive door locks. For example, patent CN114837499A discloses an adaptive multi-functional automotive side door lock with an electric opening and closing chain. The closing chain design employs an adaptive push rod and a V-groove mechanism. The adaptive push rod can slide within the V-groove to keep the closing chain in a non-collision position, ensuring electric opening and prioritizing closing for manual opening. However, when the adaptive push rod switches states within the V-groove, it sometimes collides and jams when it reaches the bottom of the V-groove. When the bottom of the V-groove is designed to be too wide, the accuracy of state switching will be reduced; therefore, the V-groove needs to be optimized in terms of groove width and groove shape. Patent CN114837500A proposes an electric compliant opening chain and an electric suction chain. Under the drive of the opening chain or the manual opening rod, the suction chain is placed in an avoidance position to ensure that the electric opening and manual opening modes are prioritized. However, the auxiliary opening chain of its suction chain adopts a moving pair for auxiliary opening. The design of this slider mechanism has low mechanical efficiency and the mechanism is prone to jamming, with large wear and poor stability.

[0004] Therefore, it is very worthwhile to study how to design a car door lock that can prioritize opening while also requiring low opening force, having a long lifespan, and being small in size. Summary of the Invention

[0005] This invention provides a double-cam single-swing rod compliant linkage combination mechanism and a structure for an electric suction door lock for automobiles. The double-cam single-swing rod compliant linkage combination mechanism is introduced into the electric suction chain. Utilizing its variable-mode motion characteristics, it can be applied to various working conditions of electric suction. The structure is ingenious, simple and reasonable, which improves the safety of the door lock during use, reduces the size of the suction door lock, and improves the adaptability of the motor.

[0006] This invention can be achieved through the following technical solutions:

[0007] A double-cam single-swing rod compliant linkage mechanism includes a first roller and a second roller alternately arranged on the free end of a swing push rod. The first roller engages with a cam, and the second roller engages with a swing cam.

[0008] The non-free end of the swing push rod is rotatably connected to the drive rod, and the two are also connected together by a spring, which is always in an extended state. One end of the drive rod is connected to the drive unit, and the other end is coaxially connected to the cam, but not moving with the cam. A torsion spring is provided at the connection point.

[0009] A resting surface segment is provided on the cam surface where the cam, the swing cam, and the first roller and the second roller cooperate.

[0010] A sudden change in profile is provided on the surface where the cam mates with the first roller, and a limit block is provided next to the drive rod;

[0011] By utilizing limit blocks, surface abrupt changes, and intermittent cam motion, a double-cam single-swing rod compliant linkage combination mechanism can achieve rigid plucking, compliant rolling, and swing avoidance multimodal motions.

[0012] Furthermore, the cam rotates counterclockwise. At this time, the drive rod is blocked by the limit block and remains stationary. The first roller of the swing push rod slides smoothly along the cam surface under the tension of the spring until the cam profile changes abruptly. The first roller slides into the abrupt profile of the cam. At this time, the swing push rod also rotates counterclockwise under the tension of the spring, so that the second roller contacts the rest profile section of the swing cam. The movement does not interfere with each other, and the swing cam is in a rest state, achieving smooth rolling.

[0013] Driven by the drive unit, the drive rod rotates counterclockwise and the first roller of the swing push rod engages with the abrupt change surface on the cam, causing the cam to rotate counterclockwise and achieving rigid actuation. At this time, the second roller of the swing push rod moves counterclockwise along the rest surface section of the swing cam. The movements do not interfere with each other, and the swing cam remains in a rest state.

[0014] The swing cam rotates clockwise. At this time, the drive rod is blocked by the limit block and remains stationary. The swing cam is driven by the second roller to rotate clockwise until the first roller disengages from the cam. Under the action of the torsion spring, the cam rotates clockwise to release and reset, thus realizing the swing avoidance.

[0015] Furthermore, the non-free end of the swing push rod is rotatably connected to the center of the drive rod, and a spring is connected between the drive rod portion near the cam and the first roller.

[0016] An electric magnetic door lock for automobiles with a cam-rocker-compliant linkage combination mechanism includes a ratchet and pawl mechanism mounted on the lock body, wherein the pawl disc and the pawl are coaxially connected. It also includes a combination mechanism disposed between the ratchet and pawl layers and the pawl disc layer. This combination mechanism employs a spatial structure where a double-cam single rocker and a compliant linkage are coupled together. It utilizes a limiting block, abrupt surface changes, and intermittent cam motion to achieve rigid actuation, compliant rolling, and swing avoidance multimodal motion, thereby completing the electric magnetic closing, magnetic closing reset, and unlocking priority functions of the automobile door lock.

[0017] Furthermore, the combined mechanism includes an engaging roller and an opening roller staggered on the free end of the swing push rod. The engaging roller engages with a ratchet, and the opening roller engages with an opening cam. The opening cam is coaxially and fixedly connected to the pawl rotation shaft.

[0018] The non-free end of the swing push rod is rotatably connected to the attraction drive rod, and the two are also connected together by a compression return spring, which is always in an extended state. One end of the attraction drive rod is connected to the attraction drive unit, and the other end is coaxially connected to the ratchet rotation shaft, but not connected to the ratchet.

[0019] An arc-shaped semi-locking protrusion is provided on the surface where the ratchet and the suction roller engage, corresponding to the semi-locking position of the car door lock;

[0020] Driven by the suction drive unit, the suction drive rod pushes the semi-locking protrusion and the ratchet to rotate via the suction roller, converting the rigid thrust into a flexible thrust that acts on the ratchet, so that the car door lock moves from the semi-locked state to the fully locked state, thus achieving electric suction.

[0021] The driving force drives the opening cam and pawl to rotate via the pawl disc, which in turn pushes the swing push rod through the opening roller, causing the engaging roller to disengage from the ratchet. The ratchet then enters the release state, and the swing rod is in the avoidance state until the pawl disengages from the ratchet, thus enabling the car door lock to be opened or prioritized for opening.

[0022] Furthermore, the non-free end of the swing push rod is rotatably connected to the center of the rod portion of the attraction drive rod, and a compression return spring is connected between the attraction drive rod portion near the ratchet and the opening roller.

[0023] Torsion springs are provided at the connection points of the suction drive rod and the ratchet rotation shaft, and at the connection points of the opening cam and the pawl rotation shaft.

[0024] A limiting block is provided on the lock body near the suction drive rod;

[0025] After the electric engagement is completed, the engagement drive rod is reset under the action of the torsion spring and the compression return spring, which drives the engagement roller of the swing push rod to smoothly roll along the return rest surface corresponding to the ratchet until the engagement drive rod abuts against the limit block, realizing engagement reset and ensuring that the starting position of the electric engagement is consistent.

[0026] Furthermore, the reset rest surface is positioned near the semi-locking protrusion.

[0027] Furthermore, a suction rest surface that cooperates with the opening roller is provided on the cam surface of the opening cam. The suction rest surface is used to achieve smooth rolling of the opening roller and the opening cam, ensuring that the opening cam is in a rest state during the electric suction process.

[0028] Furthermore, the opening cam includes a cam portion and a rod-shaped portion connected thereto. The curved profile of the cam portion cooperates with the opening roller, and the free end of the rod-shaped portion is coaxially and fixedly connected to the pawl rotation shaft.

[0029] Furthermore, the attraction drive unit includes a motor, the output shaft of which is connected to a worm gear mechanism. The worm gear of the worm gear mechanism meshes with the attraction transmission wheel, and the attraction transmission wheel is connected to the attraction drive rod via a cable, which is wound onto a winding wheel.

[0030] The beneficial technical effects of this invention are as follows:

[0031] (1) A double cam single rocker arm compliant linkage combination mechanism is proposed. This mechanism can realize three motion modes: compliant adaptive rolling, rigid pushing, and swing avoidance, as well as switching between each mode. Based on this mechanism, the electric suction chain of the car door lock is constructed, which is compatible with the opening chain and other chain motions, and ensures the priority of the opening action during the suction process.

[0032] (2) The double-layer cam mechanism is adopted, which is compact in structure. The designed suction mechanism can realize electric suction, opening and opening priority functions respectively by switching the drive and different boundary conditions in the narrow space of the car door lock.

[0033] (3) Both the opening cam and the ratchet are equipped with rest surface sections, which match the movement trajectory of the opening roller and the closing roller of the swing push rod to form a geometric virtual constraint. This simplifies the motion decoupling design of the two cam profiles and enables the intermittent motion of the cam. The geometric virtual constraint between the opening roller and the opening cam enables smooth rolling motion during the electric closing process from half lock to full lock, ensuring smooth execution of the closing motion. The geometric virtual constraint between the closing roller and the ratchet enables smooth rolling motion during the closing and resetting process.

[0034] (4) From the contact force curves of the ratchet and pawl between the engagement mechanism and the locking mechanism, the engagement mechanism and the opening mechanism, and the contact force curve of the rocker arm and the ratchet, it can be seen that the double cam single rocker arm design reduces wear and extends service life during the electric engagement process because the ratchet surface changes smoothly.

[0035] (5) A compliant linkage mechanism with reset feature is proposed. It has compliant adaptive motion and is combined with the cam rocker mechanism. Combined with the cam profile curve, it has self-reset. During the entire process of engagement, the mechanism converts mechanical rigid impact into flexible impact to a large extent, thereby reducing the frame vibration force or impact force and enabling the door lock to operate stably for a long life.

[0036] The automotive door lock engagement mechanism disclosed in this invention can complete the engagement function and ensure opening priority. It has low opening force, low mechanical impact, low wear, and long service life. The double cam single rocker arm mechanism has good motion decoupling and is easy to design cam profile curves. Attached Figure Description

[0037] Figures 1(a)-1(c) are schematic diagrams of the principle of the double cam single pendulum compliant linkage mechanism proposed in this invention, corresponding to the motion states of compliant rolling, rigid plucking, and swinging avoidance, respectively.

[0038] Figure 2 This is a schematic diagram illustrating the equivalent correlation principle of the double-cam single-swing rod compliant linkage mechanism proposed in this invention applied to automotive door locks.

[0039] Figures 3(a)-3(c) show the front view, side view and partial enlarged view of the double cam single rocker arm compliant mechanism proposed in this invention applied to an automobile door lock;

[0040] Figure 4(a) is a schematic diagram of the motion scheme of the double cam single rocker arm compliant linkage combination mechanism of the car door lock in the fully open to half-lock condition proposed in this invention;

[0041] Figure 4(b) is a schematic diagram of the cam rocker arm compliant linkage combination mechanism of the car door lock in the fully open to half-lock condition proposed in this invention;

[0042] Figure 4(c) is a schematic diagram of the motion of the door lock suction mechanism in the fully open state under the fully open to half-lock conditions of the car door lock proposed in this invention;

[0043] Figure 4(d) is a schematic diagram of the movement of the door lock suction mechanism in the half-lock state under the fully open to half-lock conditions proposed in this invention.

[0044] Figure 4(e) is a schematic diagram of the semi-locked state of the car door lock proposed in this invention under the conditions of being fully open to half-locked.

[0045] Figure 5(a) is a schematic diagram of the motion scheme of the double cam single rocker arm compliant linkage combination mechanism of the car door lock under the electric suction condition proposed in this invention;

[0046] Figure 5(b) is a schematic diagram of the double cam single rocker arm compliant linkage combination mechanism of the car door lock under the electric engagement condition, which considers the lock ratchet and pawl.

[0047] Figure 5(c) is a schematic diagram of the semi-locking motion of the car door lock proposed in this invention under the electric engagement condition;

[0048] Figure 5(d) is a schematic diagram of the full lock movement of the car door lock proposed in this invention under the electric engagement condition;

[0049] Figure 5(e) is a structural diagram of the engagement mechanism of the car door lock proposed in this invention when the door lock is in the fully locked state during the engagement process;

[0050] Figure 6 This is a schematic diagram illustrating the state changes of the car door lock during the engagement and reset process proposed in this invention.

[0051] Figure 7(a) is a schematic diagram of the motion scheme of the double cam single rocker arm compliant linkage combination mechanism of the car door lock under the fully locked opening condition proposed in this invention;

[0052] Figure 7(b) is a schematic diagram of the double cam single rocker arm compliant linkage combination mechanism of the car door lock under the condition of full lock opening, which takes into account the ratchet and pawl of the car door lock proposed in this invention;

[0053] Figure 7(c) is a schematic diagram of the full lock movement of the car door lock proposed in this invention under the full lock open condition;

[0054] Figure 7(d) is a schematic diagram of the fully open movement of the car door lock proposed in this invention under the fully locked open condition;

[0055] Figure 7(e) is a schematic diagram of the engagement mechanism of the car door lock proposed in this invention at the initial moment when the door lock is in the fully unlocked state during the engagement process;

[0056] Figure 8(a) is a schematic diagram of the motion scheme of the double cam single rocker arm compliant linkage combination mechanism of the car door lock in the half-lock opening condition proposed in this invention;

[0057] Figure 8(b) is a schematic diagram of the double cam single rocker arm compliant linkage combination mechanism for automobile door lock under the condition of half lock opening, which takes into account ratchet and pawl.

[0058] Figure 8(c) is a schematic diagram of the semi-lock movement of the car door lock proposed in this invention under the semi-lock opening condition;

[0059] Figure 8(d) is a schematic diagram of the fully open movement of the car door lock proposed in this invention under the condition of half-lock opening;

[0060] Figure 8(e) is a schematic diagram of the position of the engaging mechanism when the car door lock proposed in this invention is in the half-lock position and the door lock is in the priority opening condition.

[0061] Figure 8(f) shows the position of the engaging mechanism in the priority opening mode of the car door lock proposed in this invention when the door lock is in the half-lock position. Figure 2 ;

[0062] Figure 9 The simulation curves of the car door lock proposed in this invention during the entire electric engagement process are shown.

[0063] Among them, 1-drive rod (engagement drive rod), 2-swing push rod, 21-first roller (engagement roller), 22-second roller (opening roller), 3-cam (ratchet), 31-semi-locking protrusion, 4-swinging cam (opening cam), 5-pawl, 6-7-7'-torsion spring, 8-spring (compression return spring), 9-pawl disc, 10-motor, 11-worm gear mechanism, 12-engagement transmission gear, 13-cable, 14-winding wheel, 15-lock body. Detailed Implementation

[0064] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0065] Considering the limited space inside the car door lock, and based on the actual working conditions of the magnetic attraction and the requirement for priority opening, the designed electric magnetic attraction mechanism should meet the following design requirements:

[0066] (1) To ensure the stability of the electric engagement motion, the electric engagement mechanism should have one degree of freedom and a small space to meet the constraints of the narrow space inside the lock;

[0067] (2) In order to prevent conflicts between manual opening and electric engagement, and to enable manual opening when the engagement is partially locked, the designed engagement mechanism should be able to achieve an opening priority greater than an engagement priority, and the engagement mechanism should not interfere with other branches when it moves.

[0068] (3) In order to ensure the reliability of the attraction function, the attraction mechanism also needs to have good reset characteristics and flexibility, so that it can achieve rapid reset and less impact and wear during the reset process.

[0069] Addressing the functional requirements and confined space constraints of automotive door lock design, as shown in Figure 1, this invention provides a double-cam single-swing rod compliant linkage mechanism. It includes a first roller 21 and a second roller 22 staggered on the free end of a swing push rod 2. The first roller 21 engages with a cam 3, and the second roller 22 engages with a swing cam 4. The non-free end of the swing push rod 2 is rotatably connected to a drive rod 1, and the two are also connected by a spring 8. This spring is always extended, allowing the non-free end of the swing push rod to be rotatably connected to the center of the drive rod. A spring connects the drive rod portion near the cam and the first roller. One end of the moving rod 1 is connected to the drive unit, and the other end is coaxially connected to the cam 3, but not moving with the cam 3. Torsion springs 7 and 7' are provided at the connection point. Resting surface sections are provided on the cam surfaces of the cam 3, the swing cam 4, and the first roller 21 and the second roller 22. Abrupt surface 31 is provided on the surface of the cam 3 and the first roller. A limit block S1 is provided next to the drive rod 1. Thus, the two pairs of cam-rocker mechanisms of the combined mechanism of the present invention are respectively composed of the swing cam 4 and the swing push rod 2, and the cam 3 and the swing push rod 2. The drive rod 1, the swing push rod 2, and the spring 8 constitute a spring four-bar linkage mechanism. The basic design idea is as follows:

[0070] (1) Multiple contact states

[0071] Spring 8 is always under tension, ensuring that at least one pair of cam rocker arms of the two pairs of cam rocker arms is in contact. That is, cam 3 is in contact with the first roller 21 under the tension of spring 8, or oscillating cam 4 is in contact with the second roller 22 under the tension of spring 8. It has multiple transmission and contact states and can achieve force closure to ensure surface contact.

[0072] (2) The trajectories overlap, and the rolling is smooth.

[0073] The oscillating cam 4 is provided with an intermittent rest section. The profile curve of this section forms a geometric virtual constraint with the second roller 22 of the oscillating push rod 2, so that the motion trajectory design of the contact point of the second roller 22 in this process coincides with the cam profile curve, which can achieve smooth rolling. The same applies to the cam 3 and the first roller 21.

[0074] (3) Abrupt change in contact surface, release and reset.

[0075] Cam 3 is equipped with a sudden change in surface profile to ensure locking and releasing of the profile, while the compliant spring linkage mechanism has self-resetting properties, which, combined with the cam torsion spring, allows it to return to its original position.

[0076] Therefore, based on the above theory, by utilizing the limit block S1, the abrupt change in shape, and the intermittent motion of the cam, the rigid actuation, compliant rolling, and oscillating avoidance multimodal motions of the double cam single pendulum compliant linkage combination mechanism can be realized, as shown in Figures 1(a)-1(c), as detailed below:

[0077] Smooth rolling: When the cam rotates counterclockwise, the drive rod is blocked by the limit block and remains stationary. The first roller of the swing push rod slides smoothly along the cam surface under the tension of the spring until the cam profile changes abruptly. The first roller slides into the abrupt profile of the cam. At this time, the swing push rod also rotates counterclockwise under the tension of the spring, so that the first roller contacts the rest profile section of the swing cam. The movement does not interfere with the movement, and the swing cam is in a resting state.

[0078] Rigid actuation: Driven by the drive unit, the drive rod rotates counterclockwise and the first roller of the swing push rod cooperates with the abrupt change surface on the cam, causing the cam to rotate counterclockwise, thus achieving rigid actuation. At this time, the second roller of the swing push rod moves counterclockwise along the rest surface section of the swing cam. The movement does not interfere with each other, and the swing cam remains in the rest state.

[0079] Swinging avoidance: The swinging cam rotates clockwise. At this time, the drive rod is blocked by the limit block and remains stationary. The swinging cam is driven by the second roller to rotate clockwise until the first roller disengages from the cam. Under the action of the torsion spring, the cam rotates clockwise to release and reset, thus realizing swinging avoidance.

[0080] Based on the above features, it can be seen that the combined mechanism designed in this invention can achieve fewer parts, multiple functions, and multiple modes within a confined space. Therefore, as... Figure 2 As shown, the combined mechanism proposed in this invention can be embedded between the ratchet and pawl layers and the pawl disc layer. The drive rod and the ratchet rotation shaft are coaxially installed, and the swing cam and the pawl rotation shaft are coaxially installed. By utilizing the existing rotating shaft inside the lock to form a new shaft system structure, the motion interference between the various branches caused by the addition of an extra drive shaft is avoided. This constructs a new type of automotive door lock engaging chain. The manual opening and electric engaging functions can be realized by driving the cam or the swing push rod, and the opening has priority.

[0081] In other words, this invention proposes an electric magnetic door lock for automobiles with a cam-rocker-compliant linkage combination mechanism, including a ratchet and pawl mechanism mounted on the lock body, wherein the pawl disc and the pawl are coaxially connected, and a combination mechanism is also provided between the ratchet and pawl layer and the pawl disc layer. This combination mechanism adopts a spatial structure in which a double cam single rocker and a compliant linkage are coupled together. It utilizes a limiting block, abrupt changes in the profile, and intermittent cam motion to achieve rigid actuation, compliant rolling, and swing avoidance multimodal motion, so as to complete the electric magnetic closing, magnetic closing reset, and opening priority functions of the automobile door lock. In this way, by embedding the combined mechanism into the ratchet and pawl mechanism of the existing door lock, an electric engaging chain with opening priority is constructed. Through the curved surface cooperation between the first roller, the second roller, the opening cam, and the ratchet, and through the alternating work of the first roller and the ratchet, and the second roller and the opening cam, the electric engaging function with opening priority is achieved. Based on the intermittent nature and smooth curved surface of the cam itself, the smooth operation of the entire process of electric engaging, engaging reset, and opening priority is ensured, reducing rigid impact and frictional loss, improving the service life of the entire door lock, reducing the possibility of jamming, and enhancing the user experience of the door lock.

[0082] Specifically as follows:

[0083] The above-mentioned double-cam single-rocker compliant linkage combination mechanism, which includes drive and limit functions, is applied to an automotive door lock. A simplified diagram of the combination mechanism is shown below. Figure 2 The left-hand diagram is shown; the simplified diagram of the equivalent mechanism in the corresponding car door lock is shown below. Figure 2 As shown in the right figure, the simplified diagram of this mechanism provides a basis for the integration of multi-mode and lock internal application mechanisms. In this mechanism, cam 3 is equivalent to ratchet 3, swing cam 4 is equivalent to opening cam 4, and opening cam 4 is coaxial with the pawl disk rotation axis corresponding to pawl 5. The two are fixedly installed, and their return torsion spring is located at point B. Drive rod 1 is installed coaxially with the ratchet rotation axis corresponding to ratchet 3 as attraction drive rod 1, but they are not linked. Its return torsion spring is located at point A. Second roller 22 is equivalent to opening roller 22, and first roller 21 is equivalent to attraction roller 21. The arc-shaped semi-locking protrusion 31 and the connecting surface corresponding to ratchet 3 will form an arc-shaped transition groove surface to cooperate with first roller 21 and facilitate attraction operation. At the same time, the surface corresponding to ratchet 3 near semi-locking protrusion 31 is set as a return rest surface section to adapt to the smooth rolling of attraction roller 21 during attraction and reset.

[0084] As shown in Figures 3(a)-3(c), the combined mechanism adopts the above-mentioned double cam single rocker arm compliant linkage mechanism, including an attraction roller 21 and an opening roller 22 arranged alternately on the free end of the rocker push rod 2. The attraction roller 21 cooperates with the ratchet 3, and the opening roller 22 cooperates with the opening cam 4. The opening cam 4 is coaxially fixedly connected to the pawl disk rotation shaft. The non-free end of the rocker push rod 2 is rotatably connected to the attraction drive rod 1. The two are also connected together by a compression return spring 8. The compression return spring 8 is always in an extended state. One end of the attraction drive rod 1 is connected to the attraction drive unit, and the other end is coaxially connected to the ratchet rotation shaft, but is not connected to the ratchet 3. An arc-shaped semi-locking protrusion 31 is provided on the surface where the ratchet 3 cooperates with the attraction roller 21, corresponding to the semi-locking position of the car door lock. At the same time, a limiting block S1 is provided on the lock body 15 near the attraction drive rod 1.

[0085] To accommodate the position of the pawl and ratchet in the lock body, the opening cam 4 includes a cam portion and a rod-shaped portion connected thereto. The curved profile of the cam portion engages with the opening roller, and the free end of the rod-shaped portion is coaxial with the pawl disc rotation axis. The two are fixedly connected. A suction rest type surface section is provided on the cam surface of the cam portion to engage with the opening roller 22, so as to achieve smooth rolling of the opening roller and the opening cam, and ensure that the opening cam is in a rest state during the electric suction process, and will not interfere with it.

[0086] Thus, the two pairs of cam-rocker mechanisms of this combined mechanism are respectively composed of an opening cam 4 and a swing push rod 2, a ratchet 3 and a swing push rod 2. The engaging drive rod 1, the swing push rod 2 and the pressing and returning spring 8 constitute a spring four-bar linkage mechanism. The opening cam 4 and the opening roller 22 are in a variable contact state; the engaging roller 21 in the swing push rod 2 and the ratchet 3 are in a variable contact state, that is, they have different contact states depending on the working conditions, drive and limit position. The mechanism has a variable degree of freedom and a variable topology, corresponding to different motion modes.

[0087] Fully open to half-lock: Smooth rolling and avoidance

[0088] As shown in Figures 4(a)-4(e), when moving from fully open to half-lock, the locking pin pushes the ratchet 3 to rotate counterclockwise, causing the adsorption roller 21 of the swing push rod 2 to adapt to the movement of the ratchet 3. At this time, the opening roller 22 of the swing push rod 2 contacts the opening cam 4. When the half-locking protrusion 31 on the ratchet 3 contacts the adsorption roller 21, the ratchet 3 drives the swing push rod 2 to swing clockwise and briefly disengage from the opening cam 4. As the ratchet 3 continues to rotate until it reaches the half-locked state, the opening roller 22 and the opening cam 4 return to the contact state. At this time, the adsorption roller 21 passes over the half-locking protrusion 31 and falls into the arc-shaped groove surface, making contact with it, preparing for subsequent electric adsorption.

[0089] Electric engagement: rigid actuation

[0090] As shown in Figures 5(a)-5(e), driven by the suction drive unit, the suction drive rod pushes the half-lock protrusion and the ratchet to rotate via the suction roller, converting the rigid thrust into a flexible thrust that acts on the ratchet, so that the car door lock changes from a half-lock state to a fully locked state, thus achieving electric suction.

[0091] The attraction drive unit can be implemented using a worm gear mechanism and a cable transmission mechanism, including a motor 10. The output shaft of the motor 10 is connected to a worm gear mechanism 11. The worm gear of the worm gear mechanism 11 meshes with an attraction transmission wheel 12. The attraction transmission wheel 12 is connected to the attraction drive rod 1 via a cable 13, which is wound onto a winding wheel 14.

[0092] After the car door lock reaches the half-lock state, the suction drive unit receives a signal and begins to engage. The cable drives the suction drive rod 1 to rotate counterclockwise. The swing push rod 2 contacts the ratchet 3 through the suction roller 21, pushing the half-lock protrusion 31 to make the ratchet 3 rotate counterclockwise. The ratchet and pawl move from the half-lock position to the fully locked position. At this time, the curve of the opening cam 4 and the contact point trajectory of the opening roller 22 of the swing push rod 2 coincide as a geometric virtual constraint. That is, the opening roller 22 moves along the suction rest surface section on the opening cam 4. The curves of the two coincide and are compatible, and will not interfere with the engagement.

[0093] Because the ratchet 3 is a cam structure, the suction roller 21 moves in a curved motion throughout the entire suction process, while the semi-locking protrusion 31 and the suction roller 21 have an arc-shaped contact. This makes it more suitable for the pushing motion of the suction roller 21, converting the sliding rigid actuation into a flexible actuation. At the same time, the arc-shaped transition between the semi-locking protrusion 31 and the suction roller can effectively reduce wear, effectively reduce contact force, and extend the service life of the door lock.

[0094] Suction and return: smooth and gliding

[0095] like Figure 6 As shown, after the electric engagement is completed, the car door lock reaches the fully locked state. The engagement drive rod 1 is reset under the action of the torsion spring 7 and the compression return spring 8. The engagement roller 21 of the swing push rod 2 forms contact with the ratchet 3 and smoothly rolls along the compound rest surface section of the ratchet 3 until the engagement drive rod 1 moves to the limit block S1. The engagement mechanism is reset to the limit position of the limit block S1, realizing engagement reset and ensuring that the starting position of the electric engagement is consistent.

[0096] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples. Various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is defined by the claims.

Claims

1. A double-cam single-swing rod compliant linkage mechanism, characterized in that: It includes a first roller and a second roller, which are staggered on the free end of the swing push rod. The first roller engages with a cam, and the second roller engages with a swing cam. The non-free end of the swing push rod is rotatably connected to the drive rod, and the two are also connected together by a spring, which is always in an extended state. One end of the drive rod is connected to the drive unit, and the other end is coaxially connected to the cam, but not moving with the cam. A torsion spring is provided at the connection point. A resting surface segment is provided on the cam surface where the cam, the swing cam, and the first roller and the second roller cooperate. A sudden change in profile is provided on the surface where the cam mates with the first roller, and a limit block is provided next to the drive rod; By utilizing limit blocks, surface abrupt changes, and intermittent cam motion, a double-cam single-swing rod compliant linkage combination mechanism can achieve rigid plucking, compliant rolling, and swing avoidance multimodal motions.

2. The double-cam single-pendulum compliant linkage combination mechanism according to claim 1, characterized in that: The cam rotates counterclockwise. At this time, the drive rod is blocked by the limit block and remains stationary. The first roller of the swing push rod slides smoothly along the cam surface under the tension of the spring until the cam profile changes abruptly. The first roller slides into the abrupt profile of the cam. At this time, the swing push rod also rotates counterclockwise under the tension of the spring, so that the second roller contacts the rest profile section of the swing cam. The movement does not interfere with the movement, and the swing cam is in a resting state, achieving smooth rolling. Driven by the drive unit, the drive rod rotates counterclockwise and the first roller of the swing push rod engages with the abrupt change surface on the cam, causing the cam to rotate counterclockwise and achieving rigid actuation. At this time, the second roller of the swing push rod moves counterclockwise along the rest surface section of the swing cam. The movements do not interfere with each other, and the swing cam remains in a rest state. The swing cam rotates clockwise. At this time, the drive rod is blocked by the limit block and remains stationary. The swing cam is driven by the second roller to rotate clockwise until the first roller disengages from the cam. Under the action of the torsion spring, the cam rotates clockwise to release and reset, thus realizing the swing avoidance.

3. The double-cam single-pendulum compliant linkage combination mechanism according to claim 2, characterized in that: The non-free end of the swing push rod is rotatably connected to the center of the drive rod, and a spring is connected between the drive rod portion near the cam and the first roller.

4. An automotive electric soft-close door lock with a cam rocker arm compliant linkage combination mechanism, comprising a ratchet and pawl mechanism disposed on the lock body, wherein the pawl disc and the pawl are coaxially connected, characterized in that: It also includes a combined mechanism set between the ratchet and pawl layers and the pawl disc layer. The combined mechanism adopts a spatial structure in which a double cam single rocker arm and a compliant connecting rod are coupled together. It uses a limit block, abrupt changes in the profile and intermittent cam motion to achieve rigid actuation, compliant rolling, and swing avoidance multimodal motion to complete the electric engagement, engagement reset and opening priority functions of the car door lock. The combined mechanism includes an engaging roller and an opening roller that are staggered vertically on the free end of the swing push rod. The engaging roller engages with a ratchet, and the opening roller engages with an opening cam. The opening cam is coaxial with the rotating shaft of the ratchet disc, and the two are fixedly connected. The non-free end of the swing push rod is rotatably connected to the attraction drive rod, and the two are also connected together by a compression return spring, which is always in an extended state. One end of the attraction drive rod is connected to the attraction drive unit, and the other end is coaxially connected to the ratchet rotation shaft, but not connected to the ratchet. An arc-shaped semi-locking protrusion is provided on the surface where the ratchet and the suction roller engage, corresponding to the semi-locking position of the car door lock.

5. The automotive electric suction door lock with a cam rocker arm compliant linkage combination mechanism according to claim 4, characterized in that: Driven by the suction drive unit, the suction drive rod pushes the semi-locking protrusion and the ratchet to rotate via the suction roller, converting the rigid thrust into a flexible thrust that acts on the ratchet, so that the car door lock moves from the semi-locked state to the fully locked state, thus achieving electric suction. The driving force drives the opening cam and pawl to rotate via the pawl disc, which in turn pushes the swing push rod through the opening roller, causing the engaging roller to disengage from the ratchet. The ratchet then enters the release state, and the swing rod is in the avoidance state until the pawl disengages from the ratchet, thus enabling the car door lock to be opened or prioritized for opening.

6. The automotive electric suction door lock with a cam rocker arm compliant linkage combination mechanism according to claim 4, characterized in that: The non-free end of the swing push rod is rotatably connected to the center of the rod of the attraction drive rod, and a clamping return spring is connected between the attraction drive rod part near the ratchet and the opening roller. Torsion springs are provided at the connection points of the suction drive rod and the ratchet rotation shaft, and at the connection points of the opening cam and the pawl rotation shaft. A limiting block is provided on the lock body near the suction drive rod; After the electric engagement is completed, the engagement drive rod is reset under the action of the torsion spring and the compression return spring, which drives the engagement roller of the swing push rod to smoothly roll along the return rest surface corresponding to the ratchet until the engagement drive rod abuts against the limit block, realizing engagement reset and ensuring that the starting position of the electric engagement is consistent.

7. The automotive electric suction door lock with a cam rocker arm compliant linkage combination mechanism according to claim 6, characterized in that: The reset rest surface is located near the semi-locking protrusion.

8. The automotive electric soft-close door lock with a cam rocker arm compliant linkage combination mechanism according to claim 4, characterized in that: The cam surface of the opening cam is provided with a suction rest surface that cooperates with the opening roller. The suction rest surface is used to achieve smooth rolling of the opening roller and the opening cam, ensuring that the opening cam is in a rest state during the electric suction process.

9. The automotive electric soft-close door lock with a cam rocker arm compliant linkage combination mechanism according to claim 8, characterized in that: The opening cam includes a cam portion and a rod-shaped portion connected thereto. The curved profile of the cam portion cooperates with the opening roller, and the free end of the rod-shaped portion is coaxial with the pawl disk rotation axis, and the two are fixedly connected.

10. The automotive electric suction door lock with a cam rocker arm compliant linkage combination mechanism according to claim 5, characterized in that: The attraction drive unit includes a motor, the output shaft of which is connected to a worm gear mechanism. The worm gear of the worm gear mechanism meshes with an attraction transmission wheel. The attraction transmission wheel is connected to an attraction drive rod via a cable, which is wound onto a winding wheel.

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