Parking mechanism and control method thereof

Abstract

The invention provides a parking mechanism and a control method thereof, and the parking mechanism comprises a ratchet wheel, a pawl, a connecting rod, a rocker arm, a sliding block and an elastic piece. The rocker arm is connected to the connecting rod for controlling the connecting rod to move; the sliding block is slidably connected with the connecting rod and makes contact with the pawl. The elastic piece is connected to the connecting rod and the sliding block and used for pushing the sliding block in the direction away from the rocker arm so that the sliding block can push the pawl to move towards the ratchet wheel and be clamped with the ratchet wheel. According to the parking mechanism, the motor, the rocker arm, the connecting rod, the spring and the sliding block are matched in series, the structure of the parking mechanism is simplified, meanwhile, the transmission path of force is clear, the structure is compact, and arrangement in a gearbox is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a parking mechanism and a control method thereof. BACKGROUND

[0002] The parking mechanism is a key component for vehicle parking safety. The existing parking mechanism generally adopts a scheme combining mechanical locking components such as pawls and ratchets with hydraulic or electric actuators to achieve reliable parking and release.

[0003] However, the existing parking mechanism has a complex structure and occupies a large space, which makes it difficult to be flexibly arranged in a compact space such as a gearbox. Meanwhile, the complex structure also leads to a large number of parts and high assembly difficulty, affecting the overall reliability of the system. SUMMARY

[0004] The purpose of the present application is to provide a parking mechanism and a control method thereof to simplify the structure of the parking mechanism and reduce the space occupation.

[0005] In a first aspect, the present application provides a parking mechanism, comprising: a ratchet; a pawl; a connecting rod; a rocker arm connected to the connecting rod for controlling the movement of the connecting rod; a sliding block in sliding connection with the connecting rod, the sliding block being in contact with the pawl; a resilient member connected to the connecting rod and the sliding block for pushing the sliding block away from the rocker arm to make the sliding block push the pawl to move towards the ratchet and be engaged with the ratchet.

[0006] The parking mechanism provided by the present application simplifies the structure of the parking mechanism through the series cooperation of the motor, the rocker arm, the connecting rod, the spring and the sliding block, and at the same time makes the force transmission path clear and the structure compact, which is beneficial to the arrangement in the gearbox.

[0007] In an implementation manner, the sliding block comprises a cylindrical surface and an inclined surface, the inclined surface is connected to one end of the cylindrical surface away from the resilient member, the inclined surface is inclined towards the connecting rod, and the inclined surface or the cylindrical surface is in contact with the pawl.

[0008] In an implementation manner, a limiting portion is arranged on the connecting rod, and the sliding block is arranged between the limiting portion and the resilient member.

[0009] In an implementation manner, the parking mechanism further comprises a positioning member, and the positioning member comprises a positioning protrusion. The parking mechanism comprises a locking state and an unlocking state, in the unlocking state, the positioning protrusion is opposite to the area on the slider between the cylindrical surface and the limiting part; In the locking state, the side surface of the positioning protrusion is in contact with the cylindrical surface of the slider.

[0010] In an implementation mode, the positioning member further comprises a body, one end of the body is connected with the positioning protrusion; The body and / or the positioning protrusion is provided with a sliding groove, and the slider is in sliding connection with the sliding groove.

[0011] In an implementation mode, the connecting rod is provided with a limiting protrusion, and the elastic member is connected with the limiting protrusion.

[0012] In an implementation mode, the connecting rod comprises a first segment and a second segment, the extending direction of the first segment intersects with the extending direction of the second segment, and the first segment is connected with the elastic member; The second segment is provided with a matching key, the rocker arm is provided with a mounting hole, the inner wall of the mounting hole is provided with a key groove, the second segment is arranged in the mounting hole, and the matching key is clamped in the key groove.

[0013] In an implementation mode, the rocker arm comprises a shaft body and a rotating arm, one end of the rotating arm is connected to the shaft body, the end of the rotating arm away from the shaft body is connected with the connecting rod, and the extending direction of the rotating arm intersects with the extending direction of the shaft body; one end of the shaft body is provided with a spline.

[0014] In an implementation mode, the pawl is provided with a protruding part, the surface of the protruding part is an arc surface, and the protruding part is in contact with the slider.

[0015] In a second aspect, the application further provides a control method, wherein the control method is used for controlling the parking mechanism provided in the first aspect of the application, and the control method comprises the following steps: Detecting whether the vehicle is in a drivable state and whether the gear position is in a parking gear position and the parking mechanism is in an unlocking state; If yes, detecting whether the vehicle speed is greater than or equal to a preset vehicle speed; If the vehicle speed is greater than or equal to the preset vehicle speed, the parking mechanism is prohibited from being locked; if the vehicle speed is less than the preset vehicle speed, a parking mechanism locking request signal is sent; According to the parking mechanism locking request signal, the rocker arm of the parking mechanism is controlled to rotate to a maximum stroke position, so that the pawl is engaged with the ratchet wheel.

[0016] The control method provided by the application prevents the risk of high-speed false locking by vehicle speed judgment to intervene the execution of the parking locking instruction, and only allows the response to the P-gear locking request when the vehicle is almost stationary (the vehicle speed is lower than the preset vehicle speed), thereby fundamentally preventing the risk of high-speed false locking. The control method realizes the active safety control of the parking locking, and greatly improves the safety of the vehicle. The control method prevents the serious accidents caused by the system misjudgment or false operation in the locking of the wheels in the driving, and ensures the normal availability of the parking function in the low-speed and stationary state.

[0017] In a third aspect, the application further provides a control method for controlling the parking mechanism provided in the first aspect of the application, and the control method comprises the following steps: detecting whether the vehicle is in a drivable state and the parking mechanism is in a locking state, and the throttle opening is greater than a preset opening; if yes, sending a parking mechanism unlocking request signal; controlling the swing arm of the parking mechanism to rotate to an initial position according to the parking mechanism unlocking request signal, so that the pawl is separated from the ratchet wheel.

[0018] The control method provided by the application provides a convenient automatic unlocking function, improves the driving experience, and enables the driver to start directly from the P-gear without additional operation of the shift lever or the parking button. At the same time, the strategy is a safety interlock, which ensures that the driver has a clear intention to start before unlocking, and avoids accidental unlocking caused by slight touching of the accelerator.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure diagram of the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 2 The structure diagram of the swing arm in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 3 The structure diagram of the sliding block in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 4 The structure diagram of the connecting rod in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 5 The structure diagram of the positioning member in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 6 The structure diagram of the pawl in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 7 The structure diagram of the torsional spring in the parking mechanism provided by the embodiment of the application is shown in the figure; Figure 8A flow chart of the control method provided for an embodiment of the present application is shown in FIG. 1. Figure 9 A flow chart of the control method provided for another embodiment of the present application is shown in FIG. 2.

[0021] Reference signs: 1 - connecting rod; 11 - first section; 111 - limiting protrusion; 12 - second section; 121 - matching key; 13 - limiting portion; 2 - rocker arm; 21 - shaft body; 211 - spline; 22 - rotating arm; 221 - mounting hole; 222 - key groove; 3 - sliding block; 31 - slope surface; 32 - cylindrical surface; 33 - through hole; 4 - elastic member; 5 - positioning member; 51 - positioning protrusion; 52 - body; 53 - sliding groove; 54 - fixing hole; 6 - ratchet wheel; 61 - tooth groove; 7 - pawl; 71 - main body; 711 - pawl tooth; 712 - protruding portion; 72 - pin shaft; 73 - torsional spring.

[0022] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0024] In the description of the present application, unless otherwise explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the description of the specification, it needs to be understood that the "upper", "lower" and other orientation words described in the embodiments of the application are described in the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the application. In addition, in the context, it also needs to be understood that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element.

[0026] The existing parking mechanism generally has the problems of insufficient compactness and large space occupation. Due to the need to integrate mechanical locking components, actuators and corresponding transmission connecting rods and other components, the overall system often has complex layout and large number of parts, which makes it difficult to flexibly arrange in occasions where the installation space of the transmission is limited. At the same time, the complex structure also increases the assembly difficulty and potential failure points of the mechanism, affecting the overall reliability of the system.

[0027] Therefore, the embodiments of the application provide a parking mechanism to simplify the structure of the parking mechanism and reduce the space occupation.

[0028] Figure 1 The structure diagram of the parking mechanism provided by the embodiments of the application is shown in Figure 1 The parking mechanism includes a ratchet wheel 6, a pawl 7, a connecting rod 1, a rocker arm 2, a sliding block 3 and an elastic member 4. The rocker arm 2 is connected to the connecting rod 1 for controlling the movement of the connecting rod 1, and the end of the rocker arm 2 away from the connecting rod 1 is used for connecting with an executing mechanism, which can be a motor exemplarily. The sliding block 3 is in sliding connection with the connecting rod 1, and the sliding block 3 is in contact with the pawl 7. The elastic member 4 is connected to the connecting rod 1 and the sliding block 3, and is used to push the sliding block 3 in a direction away from the rocker arm 2, so that the sliding block 3 pushes the pawl 7 to move towards the ratchet wheel 6 and is clamped with the ratchet wheel 6.

[0029] The ratchet wheel 6 is in interference fit with the output shaft of the transmission through the inner spline 211, so that the ratchet wheel 6 can rotate with the output shaft. The pawl 7 is rotatably installed on the housing of the transmission through a pin shaft 72. The connecting rod 1 is a long rod-shaped member, and the material thereof can be alloy steel to ensure sufficient strength and rigidity.

[0030] Figure 2 The structure diagram of the rocker arm 2 in the parking mechanism provided by the embodiments of the application is shown in Figure 2 The rocker arm 2 is sleeved on one end of the connecting rod 1 through a mounting hole 221, and the two are connected through a key to transmit torque and prevent the connecting rod 1 from coming out. The other end of the rocker arm 2 is processed with a spline 211 for matching with the output shaft of the motor as the executing mechanism. In actual application, the motor can also be selected from other types such as a servo motor and a stepping motor, and the embodiments of the application do not limit this.

[0031] Figure 3A structure diagram of the slider 3 in the parking mechanism provided by the embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the slider 3 is provided with a through hole 33 in the center, which is in clearance fit with the outer cylindrical surface of the connecting rod 1, so that the slider 3 can slide along the axial direction of the connecting rod 1. The side surface of the slider 3 is designed as a driving surface which is in contact with the pawl 7. Figure 3 As shown in FIG. 1, the slider 3 is provided with a through hole 33 in the center, which is in clearance fit with the outer cylindrical surface of the connecting rod 1, so that the slider 3 can slide along the axial direction of the connecting rod 1. The side surface of the slider 3 is designed as a driving surface which is in contact with the pawl 7.

[0032] The elastic member 4 is specifically a helical compression spring, which is made of spring steel. As shown in FIG. 1, one end of the spring is abutted against a limiting protrusion 111 in the middle of the connecting rod 1, and the other end is abutted against the side end surface of the slider 3 facing the rocker arm 2. In the natural state, the elastic member 4 can provide the slider 3 with an elastic force in the direction away from the rocker arm 2 along the connecting rod 1. Figure 1

[0033] When it is needed to lock the parking, the motor drives the rocker arm 2 to rotate, and the rocker arm 2 drives the connecting rod 1 to move. Since the part of the pawl 7 in contact with the slider 3 will cause certain resistance to the slider 3, the connecting rod 1 can move relative to the slider 3 in the direction away from the elastic member 4 under the driving of the rocker arm 2, the distance between the limiting protrusion 111 and the slider 3 is reduced, the elastic member 4 is compressed, the elastic force accumulated by the elastic member 4 pushes the slider 3 to move in the direction away from the elastic member 4, since the rocker arm 2 can drive the connecting rod 1 to rotate around the output shaft of the motor, the slider 3 can gradually approach the pawl 7 in the movement, the slider 3 further pushes the pawl 7 to rotate around the pin shaft 72 of the pawl 7, until the pawl teeth 711 of the pawl 7 are clamped into the tooth groove 61 of the ratchet wheel 6, the parking is locked. When it is needed to unlock, the motor reverses the rotation, the rocker arm 2 and the connecting rod 1 are reset, the pushing force of the elastic member 4 is reduced, under the action of the pawl 7 reset mechanism (such as the torsion spring 73), the pawl 7 is separated from the ratchet wheel 6, and the slider 3 is also pushed back to the original position.

[0034] The parking mechanism provided by the embodiment of the present application simplifies the structure of the parking mechanism through the series connection of the motor, the rocker arm 2, the connecting rod 1, the spring and the slider 3, and at the same time, the transmission path of the force is clear, the structure is compact, and it is beneficial to arrange in the gearbox.

[0035] Figure 4 A structure diagram of the connecting rod 1 in the parking mechanism provided by the embodiment of the present application is shown in FIG. 1. Figure 1 and Figure 4 As described above, the connecting rod 1 is provided with the limiting protrusion 111, and the elastic member 4 is connected with the limiting protrusion 111. The limiting protrusion 111 can be a ring-shaped boss directly machined on the connecting rod 1, or can be a plurality of protrusions. The limiting protrusion 111 is located in the middle segment of the connecting rod 1. The elastic member 4 can be sleeved on the connecting rod 1, one end of the elastic member 4 is directly abutted against the limiting protrusion 111, and the other end of the elastic member 4 is abutted against the end surface of the slider 3. The limiting protrusion 111 is directly machined on the connecting rod 1, which provides a stable and reliable mounting fulcrum for the elastic member 4, and the structure is simple and convenient to assemble.​

[0036] In some embodiments, as shown in Figure 3 The slider 3 includes a cylindrical surface 32 and a slope surface 31, the slope surface 31 is connected to the end of the cylindrical surface 32 away from the elastic member 4, and the slope surface 31 is inclined towards the direction close to the connecting rod 1, and the slope surface 31 or the cylindrical surface 32 is in contact with the pawl 7.

[0037] In some embodiments, the slider 3 is in the shape of a stepped cylinder, the end close to the elastic member 4 has a larger diameter, and the cylindrical surface of this end constitutes the cylindrical surface 32 of the slider 3. The outer diameter of the slider 3 gradually decreases from the end of the cylindrical surface 32 away from the elastic member 4, forming a conical or frustoconical surface, which constitutes the slope surface 31 of the slider 3, and the slope surface 31 is inclined towards the direction close to the central axis of the connecting rod 1. In the process of converting the parking mechanism from the unlocked state to the locked state, the slope surface 31 of the slider 3 first contacts a protruding part 712 on the pawl 7, and the contact point gradually transitions from the slope surface 31 to the cylindrical surface 32 as the slider 3 moves. When fully locked, the protruding part 712 of the pawl 7 is in surface contact with the cylindrical surface 32 of the slider 3.

[0038] In the initial stage of pushing the pawl 7 to rotate, the slope surface 31 is in contact with the pawl 7, and the slope principle is used to convert the small axial displacement of the slider 3 into a large angular displacement of the pawl 7, achieving the effect of increasing the stroke, so that the pawl 7 can quickly approach the ratchet wheel 6. In the locked state, the contact point is stable on the cylindrical surface 32, and since the cylindrical surface 32 is axially parallel to the slider 3, the reaction force of the pawl 7 acting on the slider 3 is almost perpendicular to the direction of the slider 3 movement, and this radial force is transmitted to the positioning member 5 (to be described in detail later) and the housing through the slider 3, without generating axial pushing or pulling force on the connecting rod 1, avoiding the continuous force on the connecting rod 1 in the locked state.

[0039] The slider 3 designed with the combination of the slope surface 31 and the cylindrical surface 32 in this embodiment not only ensures the smoothness and efficiency of the action of pushing the pawl 7, but also realizes the self-locking function in the locked state, so that the connecting rod 1 is free from axial locking force, improving the reliability and durability of the mechanism.

[0040] As shown in Figure 1 and Figure 4 A limiting part 13 is arranged on the connecting rod 1, and the slider 3 is arranged between the limiting part 13 and the elastic member 4. The limiting part 13 is specifically a limiting block in interference press-fit with the connecting rod 1. The limiting block is located at the end of the connecting rod 1 away from the rocker arm 2, and its outer diameter is larger than the diameter of the central through hole 33 of the slider 3. The slider 3 is sleeved on the connecting rod 1 and located between the limiting block and the elastic member 4. The elastic member 4 can be pre-pressed between the slider 3 and the limiting protrusion 111 in the middle of the connecting rod 1.

[0041] The limiting portion 13 constitutes a blocking structure for the movement of the sliding block 3 away from the rocker arm 2. When the mechanism is in the unlocked state, the sliding block 3 is pushed to the limiting portion 13 and in contact with it or maintains a small gap under the action of the pawl 7 reset mechanism. During the locking process, the sliding block 3 is pushed by the elastic member 4 to move towards the limiting portion 13, and the limiting portion 13 can limit the sliding block 3, prevent the sliding block 3 from being pulled out from the end of the connecting rod 1, and ensure that the sliding block 3 maintains contact with the pawl 7, so that the pawl 7 and the ratchet wheel 6 maintain a stable locking state.

[0042] Figure 5 The structure diagram of the positioning member 5 in the parking mechanism provided by the embodiment of the application is shown in Figure 5 The parking mechanism further includes a positioning member 5, and the positioning member 5 includes a positioning protrusion 51. The parking mechanism includes a locked state and an unlocked state, Figure 1 The state shown is the unlocked state. In the locked state, the positioning protrusion 51 is opposite to the area on the sliding block 3 between the cylindrical surface 32 and the limiting portion 13. In the unlocked state, the side surface of the positioning protrusion 51 is in contact with the cylindrical surface 32 of the sliding block 3.

[0043] The positioning member 5 is a separate component, for example, the positioning member 5 is a block structure. The positioning member 5 can be provided with two fixing holes 54 for mounting bolts, so as to be fixed on the housing of the gearbox through two bolts. The positioning member 5 is provided with a protruding structure towards the sliding block 3, that is, the positioning protrusion 51. The positioning protrusion 51 divides the movement slide of the sliding block 3 into different sections.

[0044] When the parking mechanism is in the unlocked state, as shown in Figure 1 The sliding block 3 is in contact with the limiting portion 13 at the end of the connecting rod 1 or maintains a very small gap. At this time, the positioning protrusion 51 is located between the cylindrical surface 32 and the limiting portion 13 in the radial direction of the sliding block 3, that is, the positioning protrusion 51 does not contact the cylindrical surface 32. When the parking mechanism is switched to the locked state, the sliding block 3 is pushed by the elastic member 4 to move away from the rocker arm 2, and the side surface of the sliding block 3 finally contacts and abuts against the side surface of the positioning protrusion 51. At this time, the side surface of the positioning protrusion 51 serves as a stop surface and a force receiving surface for the radial movement of the sliding block 3.

[0045] In the unlocking state, the side surface of the sliding block 3 can abut against the positioning member 5, and the end surface of the sliding block 3 in the axial direction can be limited by the limiting portion 13, so that the sliding block 3 can be limited in both the axial and radial directions, thereby ensuring the stability and position consistency of the sliding block 3 in the unlocking state. During the locking process, the rocker arm 2 can drive the connecting rod 1 to deflect by a certain angle, and the connecting rod 1 can drive the sliding block 3 to move in the radial direction towards the pawl 7. When reaching the locking position, the side surface of the sliding block 3 contacts the side surface of the positioning protrusion 51. At this time, the radial force of the pawl 7 acting on the sliding block 3 is transmitted to the side surface of the positioning protrusion 51 through the side surface of the sliding block 3, and then dispersed to the gearbox housing through the positioning member 5.

[0046] In some embodiments, as shown in Figure 5 The positioning member 5 further includes a body 52, one end of the body 52 being connected with the positioning protrusion 51. The body 52 and / or the positioning protrusion 51 are provided with a sliding groove 53, and the sliding block 3 is slidingly connected with the sliding groove 53.

[0047] In the present embodiment, the body 52 is mounted on the housing of the gearbox by means of bolts. One side of the body 52 facing the sliding block 3 is machined with a sliding groove 53 matching the outer contour of the sliding block 3. Exemplarily, the body 52 and the positioning protrusion 51 can both be provided with the sliding groove 53. In the unlocking state, at least part of the sliding block 3 can be embedded in the sliding groove 53 of the body 52. In the locking state, at least part of the sliding block 3 can be embedded in the sliding groove 53 of the positioning protrusion 51.

[0048] The sliding groove 53 provides precise sliding guidance for the sliding block 3, so that the sliding block 3 only slides in the extension direction of the sliding groove 53, avoiding shaking in other directions, thereby ensuring the stability of the movement of the sliding block 3. At the same time, the position stability of the sliding block 3 in the unlocking state and the locking state can be ensured. When the sliding block 3 receives the radial force from the pawl 7, the force is directly transmitted to the inner wall of the sliding groove 53 through the outer surface of the sliding block 3, and then dispersed to the gearbox housing through the body 52 of the positioning member 5 and the bolts. By providing the sliding groove 53 matching the sliding block 3, the guidance accuracy and stability of the movement of the sliding block 3 are greatly improved. It directly and efficiently transmits the working load (radial force) borne by the sliding block 3 to the housing of the gearbox, forming a clear unloading path, effectively protecting the transmission components such as the connecting rod 1 and the rocker arm 2, and significantly improving the reliability of the mechanism against impact.

[0049] In some embodiments, as shown in Figure 4As shown, the connecting rod 1 comprises a first section 11 and a second section 12, the extension direction of the first section 11 intersects with the extension direction of the second section 12, for example, the included angle between the first section 11 and the second section 12 is a right angle. The first section 11 is connected with the elastic member 4. The second section 12 is provided with a matching key 121, the rocker arm 2 is provided with a mounting hole 221, the inner wall of the mounting hole 221 is provided with a key groove 222, the second section 12 is inserted into the mounting hole 221, and the matching key 121 is clamped in the key groove 222.

[0050] The connecting rod 1 is an integrally formed rod-shaped component, wherein the part connected with the rocker arm 2 and inserted into the mounting hole 221 of the rocker arm 2 is defined as the second section 12, and the remaining part is the first section 11. On the rod body of the second section 12, a protruding flat key, i.e. the aforementioned matching key 121, is processed. The end of the rotating arm 22 of the rocker arm 2 is provided with a circular mounting hole 221, and the inner wall of the mounting hole 221 is provided with a key groove 222 matching the shape of the matching key 121. During assembly, the second section 12 of the connecting rod 1 is inserted into the mounting hole 221 of the rocker arm 2, and the matching key 121 is aligned and clamped into the key groove 222. When the rocker arm 2 rotates, the connecting rod 1 can be driven to rotate with the rocker arm 2 through the meshing of the key groove 222 and the matching key 121. The connecting mode of the matching key 121 and the key groove 222 is simple in structure, convenient to process and disassemble. This connecting mode can realize the same movement form of the connecting rod 1 and the rocker arm 2, i.e. the connecting rod 1 and the rocker arm 2 can move synchronously, and there is no relative movement between the connecting rod 1 and the rocker arm 2, thereby facilitating the accurate control of the movement of the connecting rod 1 through the rocker arm 2.

[0051] In some embodiments, as shown in Figure 2 The rocker arm 2 comprises a shaft body 21 and a rotating arm 22, one end of the rotating arm 22 is connected to the shaft body 21, the end of the rotating arm 22 away from the shaft body 21 is connected to the connecting rod 1, and the extension direction of the rotating arm 22 intersects with the extension direction of the shaft body 21; the shaft body 21 is provided with a spline 211 at one end.

[0052] The rocker arm 2 is welded or interference-fitted by the shaft body 21 and the rotating arm 22 to form a whole. The shaft body 21 is cylindrical, and the front end is processed with an external spline 211 for matching with the internal spline 211 of the motor output shaft to transmit torque. The shaft body 21 can be matched with the oil seal on the housing of the gearbox to seal the oil gas. The end of the shaft body 21 away from the spline 211 can be connected with the housing of the gearbox, so that the stress of the shaft body 21 can be transmitted to the housing to unload the force through the housing to prevent damage caused by unexpected stress. The rotating arm 22 is a rod-shaped body, one end of which is connected perpendicularly to the shaft body 21, and the other end is provided with a mounting hole 221 for connecting with the connecting rod 1.

[0053] In the working process, the motor output shaft drives the shaft body 21 of the rocker arm 2 to rotate through the spline 211, and the shaft body 21 drives the rotating arm 22 to swing around its axis. The mounting hole 221 at the end of the rotating arm 22 is connected through the key to drive the connecting rod 1 to move synchronously, so as to convert the rotation driving of the motor into the locking and unlocking actions of the parking mechanism.

[0054] The embodiment adopts a split type rocker arm 2 structure, and the spline 211 is arranged at the end of the shaft body 21, so that the connection interface with the motor is standardized, and the flexibility of adapting to different models of motors is increased. The shaft body 21 is supported by the shell to form a stable rotation center, which is beneficial to uniform force transmission and sealing.

[0055] Figure 6 The structure diagram of the pawl 7 in the parking mechanism provided by the embodiment of the application is shown in Figure 6 The pawl 7 is provided with a convex portion 712, the surface of the convex portion 712 is an arc surface, and the convex portion 712 is in contact with the sliding block 3. The pawl 7 is cast or machined with a convex platform, i.e., the convex portion 712, which has a smooth arc surface. The curvature radius of the arc surface is designed to enable the arc surface to maintain good contact characteristics with the slope surface 31 and the cylindrical surface 32 of the sliding block 3. In the process of the sliding block 3 pushing the pawl 7 to rotate, the arc surface of the convex portion 712 forms line contact or small-area surface contact with the slope surface 31 or the cylindrical surface 32 of the sliding block 3. Since it is an arc surface, even if the relative angle between the sliding block 3 and the pawl 7 changes during the movement, the contact point can also be smoothly transitioned, avoiding stress concentration and movement interference caused by sharp corner contact.

[0056] The arc convex portion 712 arranged on the pawl 7 significantly improves the contact condition with the sliding block 3, makes the pushing process more smooth, reduces the friction resistance and wear, and improves the sensitivity of the mechanism action and the reliability of long-term use.

[0057] In some embodiments, as shown in Figure 6 The pawl 7 includes a main body 71 and a pin shaft 72, and the main body 71 is rotatably sleeved on the pin shaft 72. The main body 71 is connected with the convex portion 712, and the main body 71 is provided with paw teeth 711 which can be clamped in the tooth groove 61 on the ratchet wheel 6. Figure 7 The structure diagram of the torsional spring 73 in the parking mechanism provided by the embodiment of the application is shown in Figure 7 The pawl 7 further includes a torsional spring 73, the torsional spring 73 is sleeved on the pin shaft 72, one end of the torsional spring 73 is connected to the main body 71, and the other end of the torsional spring 73 is connected to the shell of the transmission case.

[0058] The pin shaft 72 can be a steel cylindrical pin, which is press-fitted and fixed with the mounting hole on the gearbox shell by interference fit. The pawl 7 is provided with a through hole 33 on the main body 71, and a wear-resistant bushing is press-fitted in the hole. The main body 71 is sleeved on the pin shaft 72 through the bushing to form a clearance fit, and can freely rotate around the pin shaft 72. The pawl tooth 711 is formed on one end of the main body 71, and the tooth shape is calculated to ensure that it can be engaged with the tooth groove 61 of the ratchet wheel 6 to adapt to different locking needs of the vehicle. The protrusion 712 is formed on the other side of the main body 71 opposite to the pawl tooth 711. The torsional spring 73 is the aforementioned reset mechanism, which can be sleeved on the pin shaft 72 between the main body 71 of the pawl 7 and the shell. One end of the torsional spring 73 is connected to the main body 71, and the other end is connected to the shell.

[0059] When the parking mechanism is unlocked, the motor drives the rocker arm 2 to rotate in the reverse direction, the rocker arm 2 drives the connecting rod 1 and the sliding block 3 to move away from the pawl 7. In the process of restoring the elastic deformation of the torsional spring 73, the pawl 7 can be pushed to rotate away from the ratchet wheel 6, so that the pawl tooth 711 of the pawl 7 is separated from the tooth groove 61 of the ratchet wheel 6, and the unlocking is realized. The combination of the pin shaft 72, the main body 71 of the pawl 7 and the torsional spring 73 realizes the low-friction and high-reliability rotation support and automatic reset function of the pawl 7.

[0060] Figure 8 The flow chart of the control method provided for an embodiment of the present application is shown in Figure 8 The control method provided by the embodiment of the present application also provides a control method for controlling the parking mechanism provided by any embodiment of the present application. The control method comprises the following steps: Step S1, detecting whether the vehicle is in a drivable state and the gear is in a parking gear position, and the parking mechanism is in an unlocked state; if yes, go to step S2.

[0061] In this embodiment, the method is cooperatively executed by the vehicle controller (PCU) and the actuator controller. The vehicle controller can continuously monitor the vehicle state, including the high-voltage system state, the gear signal (P gear) and the "parking mechanism unlocking" state signal fed back from the actuator controller. When the "vehicle drivable" (such as high-voltage power-on), the gear is P gear, and the parking mechanism is currently in the unlocked state are met at the same time, step S2 can be entered.

[0062] Step S2, detecting whether the vehicle speed is greater than or equal to a preset vehicle speed; if yes, go to step S3; if no, go to step S4. Illustratively, the vehicle controller can obtain the current vehicle speed through the wheel speed sensor, and judge whether the vehicle speed is greater than or equal to the preset vehicle speed, for example, the preset vehicle speed is 5km / h.

[0063] Step S3: Prohibit the parking mechanism from locking. If the vehicle speed is greater than or equal to the preset speed (e.g., 5 km / h), the vehicle controller sends a prohibition command to the actuator controller or remains in a no-command state, and the actuator does not operate.

[0064] Step S4: Send a parking mechanism locking request signal. If the vehicle speed is less than the preset speed, the vehicle controller sends a parking mechanism locking request signal to the actuator controller.

[0065] Step S5: Based on the parking mechanism locking request signal, control the rocker arm 2 of the parking mechanism to rotate to its maximum stroke position, so that the pawl 7 engages with the ratchet 6. After receiving the parking mechanism locking request signal, the actuator controller drives the motor to rotate in a predetermined direction and angle, causing the rocker arm 2 to rotate to the maximum allowable stroke position. At this time, the pawl 7 is pushed through the connecting rod 1 and the slider 3, so that its pawl teeth 711 are fully engaged with the tooth groove 61 of the ratchet 6. After the locking action is completed, the actuator controller sends a "parking mechanism locked" status signal back to the vehicle controller.

[0066] The core of this control method is to intervene in the execution of the parking lock command by judging the vehicle speed. Only when the vehicle is nearly stationary (speed below 5 km / h) is the P-gear locking request allowed to be responded to, thus fundamentally preventing the risk of accidental locking at high speeds. This control method achieves active safety control of the parking lock, greatly improving vehicle safety. It prevents serious accidents that could result from locking the wheels while driving due to system misjudgment or misoperation, while ensuring the normal availability of the parking function at low speeds and when stationary.

[0067] Figure 9 A flowchart of a control method provided in another embodiment of this application is shown below. Figure 9 As shown in the figure, this application embodiment also provides a control method for controlling the parking mechanism provided in any embodiment of this application. The control method includes the following steps: Step S10: Detect whether the vehicle is drivable, the parking mechanism is locked, and the throttle opening is greater than a preset opening; if so, proceed to step S20. In this embodiment, the method is also executed by the vehicle controller (PCU) and the actuator controller. The preset throttle opening can be set to 10%. The vehicle controller continuously monitors the vehicle status, including the high-voltage system status, the "parking mechanism locked" status signal fed back from the actuator controller, and the throttle pedal opening signal. When the conditions of "vehicle drivable," "parking mechanism locked," and "throttle opening greater than 10%" are simultaneously met, proceed to step S20.

[0068] Step S20: Send a parking mechanism unlock request signal. After the vehicle controller determines that the above conditions are met, it immediately sends a parking mechanism unlock request signal to the actuator controller.

[0069] Step S30, according to the parking mechanism unlock request signal control parking mechanism rocker 2 rotation to the initial position, so that the pawl 7 and ratchet 6 is separated. Actuator controller after receiving the unlock request signal, drive motor reverse rotation, rocker 2 back to the initial position of the unlock. At this time, the connecting rod 1 is pulled back, the pawl 7 reset under the action of its own torsional spring 73, and the ratchet 6 is separated. Unlock action is completed, the actuator controller to the vehicle controller feedback "parking mechanism unlock" state signal.

[0070] The control method takes the driver's obvious driving intention (such as large throttle opening) as the unlock trigger condition. When the vehicle is in the locked state but the driver intends to start, the action of deep throttle will be identified by the system, and the unlock program will be automatically triggered, so that the vehicle can start smoothly.

[0071] The method provided by the embodiment provides a convenient automatic unlocking function, improves the driving experience, and enables the driver to directly start from P without additional operation of the shift lever or the parking button. At the same time, the strategy is a safety interlock, which ensures that the driver has a clear intention to start before unlocking, and avoids accidental unlocking due to slight touch of the throttle.

[0072] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A parking mechanism, characterized in that, include: ratchet; pawl; link; A rocker arm, connected to the connecting rod, is used to control the movement of the connecting rod; The slider is slidably connected to the connecting rod, and the slider is in contact with the pawl; An elastic element, connected to the connecting rod and the slider, is used to push the slider away from the rocker arm, so that the slider pushes the pawl toward the ratchet and engages with the ratchet.

2. The parking mechanism according to claim 1, characterized in that, The slider includes a cylindrical surface and a sloped surface. The sloped surface is connected to the end of the cylindrical surface away from the elastic element. The sloped surface is inclined towards the connecting rod. The sloped surface or the cylindrical surface is in contact with the pawl.

3. The parking mechanism according to claim 2, characterized in that, The connecting rod is provided with a limiting part, and the slider is disposed between the limiting part and the elastic element.

4. The parking mechanism according to claim 3, characterized in that, It also includes a positioning element, which includes a positioning protrusion; The parking mechanism includes a locked state and an unlocked state. In the unlocked state, the positioning protrusion is opposite to the area on the slider located between the cylindrical surface and the limiting part. In the locked state, the side of the positioning protrusion contacts the cylindrical surface of the slider.

5. The parking mechanism according to claim 4, characterized in that, The positioning element also includes a body, one end of which is connected to the positioning protrusion; The body and / or the positioning protrusion are provided with a sliding groove, and the slider is slidably connected to the sliding groove.

6. The parking mechanism according to claim 1, characterized in that, The connecting rod is provided with a limiting protrusion, and the elastic element is connected to the limiting protrusion.

7. The parking mechanism according to claim 1, characterized in that, The connecting rod includes a first segment and a second segment, the extension direction of the first segment intersects the extension direction of the second segment, and the first segment is connected to the elastic element; The second segment is provided with a mating key, the rocker arm is provided with a mounting hole, the inner wall of the mounting hole is provided with a keyway, the second segment passes through the mounting hole, and the mating key is engaged in the keyway.

8. The parking mechanism according to claim 1, characterized in that, The rocker arm includes a shaft and a rotating arm. One end of the rotating arm is connected to the shaft, and the end of the rotating arm away from the shaft is connected to the connecting rod. The extending direction of the rotating arm intersects the extending direction of the shaft. A spline is provided at one end of the shaft.

9. The parking mechanism according to claim 1, characterized in that, The pawl has a protrusion with an arc-shaped surface, and the protrusion contacts the slider.

10. A control method, characterized in that, The control method for controlling the parking mechanism according to any one of claims 1-9 includes the following steps: Check whether the vehicle is in a drivable state, and whether its gear is in the parking position and the parking mechanism is unlocked; If so, check if the vehicle speed is greater than or equal to the preset vehicle speed; If the vehicle speed is greater than or equal to the preset vehicle speed, the parking mechanism is prohibited from locking; if the vehicle speed is less than the preset vehicle speed, a parking mechanism locking request signal is sent. The parking mechanism rocker arm is controlled to rotate to its maximum travel position according to the parking mechanism locking request signal, so that the pawl engages with the ratchet.

11. A control method, characterized in that, The control method for controlling the parking mechanism according to any one of claims 1-9 includes the following steps: Check whether the vehicle is in a drivable state, the parking mechanism is locked, and the throttle opening is greater than the preset opening. If so, send a parking unlock request signal; The parking mechanism's rocker arm is controlled to rotate to its initial position according to the parking mechanism unlock request signal, so that the pawl separates from the ratchet.

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