Transmission parking brake and vehicle

Abstract

The present application provides a transmission parking device and a vehicle. In this transmission parking device, a pawl offset structure offsets the parking pawl to be separated from the parking gear; the parking rocker arm includes a fixed end and a free end, the parking rocker arm can rotate around the axis of the fixed end, and the first parking magnet is located on the movement path of the free end of the parking rocker arm; one end of the parking rod is connected to the free end, and the other end has a pawl driving part, and the pawl driving part is adjacent to the parking pawl; wherein, when the free end rotates around the axis of the fixed end towards the direction close to the first parking magnet until it is adsorbed by the first parking magnet, it drives the parking rod to move, so that the pawl driving part overcomes the biasing force of the pawl offset structure and pushes the parking pawl towards the direction close to the parking gear until the protruding part of the parking pawl engages with the tooth groove of the parking gear. This transmission parking device has a simple structure, low cost, and high parking reliability.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a transmission parking device and a vehicle. Background Art

[0002] The transmission is an essential component in traditional fuel vehicles and hybrid vehicles. The transmission parking device is a device used for parking within the transmission. When the vehicle stops running and the driver switches the vehicle gear to the P gear, the transmission parking device will start to operate, causing the parking pawl of the parking structure to lock the parking gear on the transmission output shaft to ensure that the vehicle does not roll away.

[0003] In related technologies, a hydraulic structure and a solenoid valve are generally used in combination to drive the movement of the parking pawl, so that the parking pawl meshes with the parking gear and locks the parking gear.

[0004] However, the cooperation relationship between components such as the hydraulic structure and the solenoid valve is relatively complex, and the cost is also relatively high. Summary of the Invention

[0005] In view of this, the present application provides a transmission parking device and a vehicle, which have a relatively low implementation cost and relatively high operating reliability.

[0006] Specifically, the following technical solutions are included:

[0007] In a first aspect, a transmission parking device is provided. The transmission parking device includes: a first parking magnet, a parking rocker arm, a parking rod, a parking pawl, and a pawl biasing structure. The parking rocker arm has magnetism, and the parking pawl has a protruding portion;

[0008] The pawl biasing structure biases the parking pawl to be separated from the parking gear;

[0009] The parking rocker arm includes a fixed end and a free end. The parking rocker arm can rotate around the axis of the fixed end. The first parking magnet is located on the movement path of the free end of the parking rocker arm;

[0010] One end of the parking rod is connected to the free end, and the other end has a pawl driving portion, and the pawl driving portion is adjacent to the parking pawl;

[0011] Wherein, when the free end rotates around the axis of the fixed end towards the direction close to the first parking magnet until it is adsorbed by the first parking magnet, it drives the parking rod to move, so that the pawl driving portion overcomes the biasing force of the pawl biasing structure and pushes the parking pawl towards the direction close to the parking gear until the protruding portion of the parking pawl is caught in the tooth groove of the parking gear.

[0012] Optionally, the transmission parking device further includes: a second parking magnet;

[0013] The second parking magnet is located on the movement path of the free end of the parking rocker arm and has a different position from the first parking magnet;

[0014] Wherein, when the free end rotates around the axis of the fixed end towards the direction close to the second parking magnet until it is adsorbed by the second parking magnet, it drives the parking rod to move, so that the driving force of the pawl driving part on the parking pawl gradually weakens until the driving force is 0.

[0015] Optionally, the transmission parking device further includes a parking driving motor and a speed reduction structure. The speed reduction structure includes a first reduction gear, a second reduction gear, a third reduction gear and a speed reduction output shaft. The fixed end of the parking rocker arm has a first mounting hole, and the parking driving motor has an output gear;

[0016] The first reduction gear meshes with the output gear. The second reduction gear is coaxial with the first reduction gear, and the diameter of the second reduction gear is smaller than that of the first reduction gear. The third reduction gear meshes with the second reduction gear, and the diameter of the third reduction gear is larger than that of the second reduction gear. The third reduction gear is fixedly sleeved on the first end of the speed reduction output shaft, and the second end of the speed reduction output shaft is installed in the first mounting hole for driving the parking rocker arm to rotate around the axis of the fixed end.

[0017] Optionally, the transmission parking device further includes a control unit, and the parking driving motor, the first parking magnet and the second parking magnet are respectively electrically connected to the control unit;

[0018] There is an axial movement space between the first mounting hole of the fixed end and the second end of the speed reduction output shaft. When the speed reduction output shaft drives the free end of the parking rocker arm to rotate close to the first parking magnet or the second parking magnet, the axial movement space allows the parking rocker arm to rotate relative to the speed reduction output shaft under the action of magnetic suction force and be adsorbed by the first parking magnet or the second parking magnet;

[0019] Wherein, when the parking rocker arm rotates to contact the first parking magnet or the second parking magnet, the control unit detects a contact signal and stops supplying power to the parking driving motor in response to the contact signal.

[0020] Optionally, the second end of the speed reduction output shaft has a cross-section with two ends being first arcs;

[0021] The two ends of the cross-section of the first mounting hole of the fixed end are second arcs and narrow from the two second arcs towards the middle section. When the second end is located in the first mounting hole, the first arc contacts the corresponding second arc and can slide along it, so that the first mounting hole allows the second end to rotate around the center of the first mounting hole within the first mounting hole.

[0022] Optionally, when the free end moves from the position in contact with the first parking magnet to the position in contact with the second parking magnet, the angle of rotation around the axis of the fixed end is 180 degrees, and the third reduction gear is a sector gear with a radian greater than π.

[0023] Optionally, the transmission parking device further includes a pawl hole synthesis part, and the side of the pawl hole synthesis part close to the parking pawl has a first arc-shaped groove; the side of the parking pawl close to the pawl hole synthesis part has a second arc-shaped groove. When the parking pawl is biased to be separated from the parking gear, the first arc-shaped groove and the second arc-shaped groove jointly form a pawl hole.

[0024] The pawl driving part includes a first large-diameter part, a first transition part, and a first small-diameter part connected in sequence. The diameter of the first large-diameter part is greater than the diameter of the pawl hole, the diameter of the first small-diameter part is smaller than the diameter of the pawl hole, and the first small-diameter part is located within the pawl hole.

[0025] Wherein, the parking rod can be driven by the free end to move, so that the first large-diameter part gradually extends into the pawl hole to push the parking pawl to move towards the direction close to the parking gear.

[0026] Optionally, the parking rod includes a rod body and a first spring. The rod body has a first limiting structure and a second limiting structure. The pawl driving part is sleeved outside the rod body and can slide relative to the rod body. The first spring and the pawl driving part are sequentially distributed between the first limiting structure and the second limiting structure, and the first spring biases the pawl driving part to abut against the second limiting structure.

[0027] Optionally, the pawl hole has a connected second large-diameter part and a second small-diameter part. The second large-diameter part is located on the side of the pawl hole close to the pawl driving part, and the diameter of the second large-diameter part is greater than that of the second small-diameter part.

[0028] Optionally, the pawl biasing structure includes a spring shaft rod and a second spring sleeved outside the spring shaft rod. The two ends of the second spring respectively have an extended biasing section and a fixed section. The spring shaft rod and the fixed section are fixed relative to the first parking magnet, and the biasing section abuts against the parking pawl and biases the parking pawl to be separated from the parking gear.

[0029] On the other hand, the present application provides a vehicle, including any one of the transmission parking devices described above.

[0030] An embodiment of the present application provides a transmission parking device and a vehicle. In this transmission parking device, the pawl biasing structure can bias the parking pawl to be separated from the parking gear, ensuring that the parking pawl does not interfere with the normal operation of the transmission when parking is not required; when the free end of the parking rocker rotates around the axis of the fixed end and approaches the first parking magnet and is adsorbed by the first parking magnet, the parking rod can be driven by the free end of the parking rocker to move, so that the pawl driving part overcomes the biasing force of the pawl biasing structure and pushes the parking pawl to move, making the protruding part of the parking pawl engage with the tooth groove of the parking gear to achieve parking. Since the parking rocker has magnetism, the first parking magnet can adsorb the parking rocker, and thus the parking pawl can be stably in the state of locking the parking gear, realizing the automatic locking of the parking state. Moreover, by using the magnetism of the magnet to achieve locking, the structure of the transmission parking device is relatively simple, the cooperation relationship of the components is easier to achieve, and the reliability of parking is also relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A perspective view of a transmission parking device provided by an embodiment of the present application when it is in a non-parking state;

[0033] Figure 2 A perspective view of a transmission parking device provided by an embodiment of the present application when it is in a parking state;

[0034] Figure 3 A partial structural schematic diagram of a transmission parking device provided by an embodiment of the present application;

[0035] Figure 4 A partial structural exploded view of a transmission parking device provided by an embodiment of the present application;

[0036] Figure 5 A partial structural schematic diagram of another transmission parking device provided by an embodiment of the present application;

[0037] Figure 6 A cross-sectional schematic diagram of a parking rocker in a transmission parking device provided by an embodiment of the present application;

[0038] Figure 7Schematic diagram of the structure of the third reduction gear in a transmission parking device provided by an embodiment of the present application;

[0039] Figure 8 Partial schematic diagram of the structure of another transmission parking device provided by an embodiment of the present application;

[0040] Figure 9 Schematic diagram of the structure of the parking lever in a transmission parking device provided by an embodiment of the present application;

[0041] Figure 10 Exploded schematic diagram of the structure of the parking lever in a transmission parking device provided by an embodiment of the present application;

[0042] Figure 11 Cross-sectional view of a partial structure in a transmission parking device provided by an embodiment of the present application;

[0043] Figure 12 Schematic diagram of the structure of another transmission parking device provided by an embodiment of the application;

[0044] Figure 13 Partial schematic diagram of the structure of another transmission parking device provided by an embodiment of the application.

[0045] The reference numerals in the figure are respectively represented as:

[0046] 10 - parking gear; 101 - tooth groove;

[0047] 20 - first parking magnet; 201 - first insulating base 201; 202 - first strong magnetic permanent magnet;

[0048] 30 - parking rocker arm; 301 - fixed end; 3011 - first mounting hole; 30111 - first position; 30112 - second position; 30113 - second arc; 30114 - intermediate section; 302 - free end; 3021 - third mounting hole; 303 - fixing screw:

[0049] 40 - parking lever; 401 - pawl driving part; 4011 - first large diameter part; 4012 - first transition part; 4013 - first small diameter part; 402 - rod body; 4021 - first limiting structure; 4022 - second limiting structure; 403 - first spring;

[0050] 50 - parking pawl; 501 - protruding part; 502 - second arc-shaped groove;

[0051] 60 - pawl biasing structure; 601 - spring shaft rod; 602 - second spring; 6021 - biasing section; 6022 - fixed section;

[0052] 70 - second parking magnet; 701 - second insulating base; 702 - second strong magnetic permanent magnet;

[0053] 80 - Parking drive electrode; 801 - Output gear;

[0054] 90 - Reduction structure; 901 - First reduction gear; 902 - Second reduction gear; 903 - Third reduction gear; 904 - Reduction output shaft; 9041 - First end; 9042 - Second end; 90421 - First arc;

[0055] 100 - Control unit;

[0056] 110 - Pawl hole synthesis part; 1101 - First arc-shaped groove;

[0057] 120 - Pawl hole; 1201 - Second large diameter part; 1202 - Second small diameter part;

[0058] 130 - Insulating base;

[0059] 140 - Mounting base;

[0060] 150 - Wire harness.

[0061] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0063] The orientation terms involved in the embodiments of the present application, such as "upper", "lower", "side", etc., generally take the orientation shown in the drawings or the relative orientation relationship between the structures in the actual installation state of the vehicle transmission as the reference, and the use of these orientation terms is only to more clearly describe the relationship between the structures and the structures, rather than to describe the absolute orientation. When the vehicle transmission is placed in different postures, the orientation may change. For example, "upper" and "lower" may be interchanged.

[0064] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meaning as commonly understood by those of ordinary skill in the art.

[0065] To make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the drawings.

[0066] In a first aspect, an embodiment of the present application provides a transmission parking device.

[0067] Referring to Figure 1 , the transmission parking device includes: a first parking magnet 20, a parking rocker arm 30, a parking rod 40, a parking pawl 50, and a pawl biasing structure 60. The parking rocker arm 30 has magnetism, and the parking pawl 50 has a protrusion 501.

[0068] The pawl biasing structure 60 biases the parking pawl 50 away from the parking gear 10.

[0069] The parking rocker arm 30 includes a fixed end 301 and a free end 302. The parking rocker arm 30 can rotate around the axis of the fixed end 301, and the first parking magnet 20 is located on the movement path of the free end 302 of the parking rocker arm 30.

[0070] One end of the parking rod 40 is connected to the free end 302, and the other end has a pawl driving portion 401. The pawl driving portion 401 is adjacent to the parking pawl 50.

[0071] Wherein, referring to Figure 2 , when the free end 302 rotates around the axis of the fixed end 301 towards the direction close to the first parking magnet 20 and is adsorbed by the first parking magnet 20, it drives the parking rod 40 to move, so that the pawl driving portion 401 overcomes the biasing force of the pawl biasing structure 60 and pushes the parking pawl 50 towards the direction close to the parking gear 10 until the protrusion 501 of the parking pawl 50 engages with the tooth groove 101 of the parking gear 10.

[0072] In the embodiment of the present application, in the non-parking state (Non-Parking, NP gear), the parking pawl 50 is biased by the pawl biasing structure 60 to be separated from the parking gear 10. Further, the parking pawl 50 will not interfere with the operation of the parking gear 10, and can ensure the normal operation of the vehicle. When the vehicle enters the parking state (Parking, P gear), the transmission parking device is activated, causing the parking rocker arm 30 to rotate around the axis of its fixed end 301, and the parking rod 40 can be driven by the parking rocker arm 30 to move. When the free end 302 of the parking rocker arm 30 rotates around the axis of the fixed end 301 towards the direction close to the first parking magnet 20 until it is adsorbed by the first parking magnet 20, the parking rod 40 can be driven, so that the pawl driving portion 401 thereof overcomes the biasing force of the pawl biasing structure 60 and pushes the parking pawl 50 towards the direction close to the parking gear 10 until the protruding portion 501 of the parking pawl 50 engages with the tooth groove 101 of the parking gear 10, locking the parking gear 10 to prevent the vehicle from rolling. At the same time, since the parking rocker arm 30 has magnetism, after the first parking magnet 20 adsorbs the free end 302 of the parking rocker arm 30, the transmission parking device can be automatically locked in the parking state. At this time, the position where the free end 301 of the parking rocker arm 30 is located can be referred to as the parking lock point. By using magnetic attraction to lock the parking state of the transmission parking device, the cost is relatively low and the cooperation relationship between components is relatively simple.

[0073] It should be noted that the parking gear 10 is sleeved on the output shaft of the transmission. When the parking gear 10 is locked, the output shaft of the transmission cannot rotate, thereby achieving parking. In the drawings of the present application, the relative positional relationship between the parking drive motor 80 and the parking gear 10 is only a schematic diagram, and the specific installation orientation or direction of the parking drive motor 80 can be adjusted according to actual needs.

[0074] In summary, the transmission parking device of the embodiment of the present application can ensure that the parking pawl does not interfere with the normal operation of the transmission when parking is not required; when parking is required, the protruding portion of the parking pawl is pushed into the tooth groove of the parking gear by means of the parking rocker arm and the parking rod to achieve parking; at the same time, by means of the magnetic attraction between the parking rocker arm and the first parking magnet, the transmission parking device is automatically locked in the parking state, realizing parking locking by means of a simple component cooperation relationship and improving the reliability of parking.

[0075] Optionally, continue to refer to Figure 1 and 2 , the transmission parking device further includes: a second parking magnet 70.

[0076] The second parking magnet 70 is located on the movement path of the free end 302 of the parking rocker arm 30, and its position is different from that of the first parking magnet 20.

[0077] Among them, refer to Figure 1, when the free end 302 rotates around the axis of the fixed end 301 towards the direction close to the second parking magnet 70 until it is adsorbed by the second parking magnet 70, it drives the parking lever 40 to move, so that the driving force of the pawl driving part 401 on the parking pawl 50 gradually weakens until the driving force is 0.

[0078] In the embodiment of the present application, a second parking magnet 70 with a position different from that of the first parking magnet 20 is further arranged on the movement path of the free end 302 of the parking rocker arm 30. When the free end 302 rotates around the axis of the fixed end 301 towards the direction close to the second parking magnet 70 until it is adsorbed by the second parking magnet 70, the parking lever 40 is driven by the free end 302, so that the driving force of the pawl driving part 401 on the parking pawl 50 gradually weakens until it is 0. At this time, the parking pawl 50 can be biased by the pawl biasing structure 60 to be separated from the parking gear 10. Furthermore, the parking gear 10 can rotate synchronously with the transmission output shaft, enabling the vehicle to enter the non-parking state. At the same time, the second parking magnet 70 and the parking rocker arm 30 can be tightly adsorbed together by magnetic suction force to achieve automatic locking in the non-parking state. At this time, the position where the free end 301 of the parking rocker arm 30 is located can be called the non-parking locking point.

[0079] Optionally, continue to refer to Figure 1-2 , the transmission parking device further includes a parking driving motor 80 and a reduction structure 90. Refer to Figure 3 , the reduction structure 90 includes a first reduction gear 901, a second reduction gear 902, a third reduction gear 903 and a reduction output shaft 904, and the parking driving motor 80 has an output gear 801. Refer to Figure 4 , the fixed end 301 of the parking rocker arm 30 has a first mounting hole 3011.

[0080] Refer to Figure 3 , the first reduction gear 901 meshes with the output gear 801, the second reduction gear 902 is coaxial with the first reduction gear 901, and the diameter of the second reduction gear 902 is smaller than that of the first reduction gear 901. The third reduction gear 903 meshes with the second reduction gear 902, and the diameter of the third reduction gear 903 is larger than that of the second reduction gear 902. The third reduction gear 903 is fixedly sleeved on the first end 9041 of the reduction output shaft 904. Refer to Figure 4 and Figure 5 , the second end 9042 of the reduction output shaft 904 is installed in the first mounting hole 3011 and is used to drive the parking rocker arm 30 to rotate around the axis of the fixed end 301.

[0081] In the embodiment of the present application, the output gear 801 of the parking drive motor 80 meshes with the first reduction gear 901 of the reduction structure 90, and thus the output power of the parking drive motor 80 is transmitted to the first reduction gear 901 of the reduction structure 90. The first reduction gear 901 and the second reduction gear 902 are coaxial, and the diameter of the second reduction gear 902 is smaller than that of the first reduction gear 901. The third reduction gear 903 meshes with the second reduction gear 902, and the diameter of the third reduction gear 903 is larger than that of the second reduction gear 902. Thus, the rotational speed of the third reduction gear 903 becomes smaller relative to the second reduction gear 902 or the first reduction gear 901, while the torque increases accordingly, achieving primary reduction. Moreover, by using the second reduction gear 902 as the power transmission gear between the first reduction gear 901 and the third reduction gear 903, the space occupied by the reduction structure 90 is smaller.

[0082] Optionally, referring to Figure 3 , the diameter of the first reduction gear 901 is larger than that of the output gear 801 of the parking drive motor 80. Thus, the rotational speed of the first reduction gear 901 becomes smaller compared to the output gear 801 of the parking drive motor 80, while the torque increases accordingly, achieving secondary reduction. It can be seen that the reduction structure 90 can achieve two-stage reduction, increasing the output torque to provide sufficient torque to drive the parking rocker arm 30 to rotate around the axis of its fixed end 301 against the magnetic suction force of the parking magnet. For vehicles with different requirements, different output torques can be achieved by adjusting the tooth number ratio (or transmission ratio) between the first reduction gear 901 and the output gear 801 of the parking drive motor 80 and the tooth number ratio (or transmission ratio) between the third reduction gear 903 and the second reduction gear 902.

[0083] Optionally, continuing to refer to Figure 1 , Figure 2 , Figure 12 and Figure 13 etc., the transmission parking device further includes a control unit 100. The parking drive motor 80, the first parking magnet 20, and the second parking magnet 70 are respectively electrically connected to the control unit 100.

[0084] Referring to Figure 4 , Figure 5 and Figure 6 , there is an axial movement space between the first mounting hole 3011 of the fixed end 301 and the second end 9042 of the reduction output shaft 904. When the reduction output shaft 904 drives the free end 302 of the parking rocker arm 30 to rotate close to the first parking magnet 20 or the second parking magnet 70, the axial movement space allows the parking rocker arm 30 to rotate relative to the reduction output shaft 904 under the action of the magnetic suction force and be adsorbed by the first parking magnet 20 or the second parking magnet 70.

[0085] Wherein, when the parking rocker arm 30 rotates to contact the first parking magnet 20 or the second parking magnet 70, the control unit 100 detects a contact signal and stops supplying power to the parking drive motor 80 in response to the contact signal.

[0086] In the embodiment of the present application, the control unit 100 is configured to receive the electrical signals of the first parking magnet 20 or the second parking magnet 70 to determine whether the parking rocker arm 30 contacts the first parking magnet 20 or the second parking magnet 70 and determine the position of the parking rocker arm 30; and is further configured to issue an instruction to energize the parking drive motor 80 to rotate it, or issue an instruction to stop supplying power to the parking drive motor 80 to stop it. There is an axial movement space between the first mounting hole 3011 of the fixed end 301 of the parking rocker arm 30 and the second end 9042 of the reduction output shaft 904. Thus, when the free end 302 of the parking rocker arm 30 rotates close to the first parking magnet 20 or the second parking magnet 70 (but has not directly contacted), the magnetic suction force between the parking rocker arm 30 and the parking magnet enables the parking rocker arm 30 to rotate relative to the second end 9042 of the reduction output shaft 904 and be adsorbed by the first parking magnet 20 or the second parking magnet 70 in advance. When the parking rocker arm 30 is adsorbed by the first parking magnet 20 or the second parking magnet 70, the control unit 100 can detect the contact signal and cut off the power supply to the parking drive motor 80 in time in response to the contact signal, so that the parking drive motor 80 stops rotating in time to avoid the occurrence of jamming or overheating.

[0087] Optionally, refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 12 or Figure 13 ,The first parking magnet 20 is mounted on the mounting base 140 of the transmission parking device by means of the first insulating base 201, the second parking magnet 70 is mounted on the mounting base 140 of the transmission parking device by means of the second insulating base 701. One end of the first parking magnet 20 that can adsorb the free end 302 of the parking rocker arm 30 has a first strong magnetic permanent magnet 202, and one end of the second parking magnet 70 that can adsorb the free end 302 of the parking rocker arm 30 has a second strong magnetic permanent magnet 702. The first strong magnetic permanent magnet 202 and the second strong magnetic permanent magnet 702 are made of conductor materials and are electrically connected to the control unit 100 by means of a wire harness 150. The materials and structures of the first parking magnet 20 and the second parking magnet 70 may be the same. The insulating base can ensure that the signal transmission between the first parking magnet 20 or the second parking magnet 70 and the control unit 100 is not interfered. Using strong magnetic permanent magnets can effectively improve the reliability of parking locking or non-parking locking.

[0088] Optionally, refer to Figure 4 and Figure 5, the second end 9042 of the deceleration output shaft 904 has a cross-section with both ends being the first arc 90421.

[0089] Reference Figure 4 、 Figure 5 and Figure 6 , both ends of the cross-section of the first mounting hole 3011 of the fixed end 301 are the second arcs 30113 and narrow towards the middle section 30114 starting from the two second arcs 30113. When the second end 9042 is located in the first mounting hole 3011, the first arc 90421 contacts and can slide along the corresponding second arc 30113, so that the first mounting hole 3011 allows the second end 9042 to rotate around the center of the first mounting hole 3011 within the first mounting hole 3011.

[0090] An embodiment of the present application is a specific example of the aforementioned axial movement space. In the embodiment of the present application, referring to Figure 6 , the second end 9042 of the deceleration output shaft 904 rotates around the center of the first mounting hole 3011 within the first mounting hole 3011. Specifically, it can be: the second end 9042 of the deceleration output shaft 904 can rotate from the first position 30111 to the second position 30112 within the first mounting hole 3011, or rotate from the second position 30112 to the first position 30111. By setting this axial movement space, it is possible to effectively avoid the stalling or overheating of the parking drive motor.

[0091] Optionally, to make the first arc 90421 contact and be able to slide along the corresponding second arc 30113, the diameter of the circle corresponding to the second arc 30113 can be set to be the same as or approximate to that of the circle corresponding to the first arc 90421, and the radian corresponding to the second arc 30113 is greater than the radian corresponding to the first arc 90421, so that the first arc 90421 can slide relative to the second arc 30113 by a certain angle. The cross-section of the second end 9042 of the deceleration output shaft 904 can be a quadrilateral formed by two symmetric first arcs 90421 and two parallel straight line segments. The two second arcs 30113 in the cross-section of the first mounting hole 3011 of the fixed end 301 can be in a symmetric form, and the size of the narrowest part of the middle section 30114 can be equal to or approximate to the distance between the two parallel straight line segments in the cross-section of the second end 9042 of the deceleration output shaft 904. In this way, it can be ensured that the middle section 30114 of the first mounting hole 3011 of the fixed end 301 is in close contact with the second end 9042 of the deceleration output shaft 904, thereby improving the driving effect of the deceleration output shaft 904 on the parking rocker arm 30.

[0092] Optionally, referring to Figure 1 and Figure 2 , when the free end 302 moves from the position in contact with the first parking magnet 20 to the position in contact with the second parking magnet 70, the angle of rotation around the axis of the fixed end 301 is 180 degrees. Referring toFigure 7 , the third reduction gear 903 is a sector gear with a radian greater than π.

[0093] In the embodiment of the present application, the maximum angle of rotation of the free end 302 of the drive rocker 30 in the transmission parking brake around the axis of the fixed end 301 is 180 degrees. In the actual operation of the transmission parking brake, the free end 302 only needs to repeat the reciprocating motion within 180 degrees. Therefore, the third reduction gear 903 being a sector gear with a radian greater than π can meet the driving requirement for the free end 302. And setting the third reduction gear 903 as a sector gear can further reduce the occupied space of the reduction structure 90, and further reduce the occupied space of the transmission parking brake.

[0094] Optionally, referring to Figure 8 , the transmission parking brake further includes a pawl hole synthesis part 110. The side of the pawl hole synthesis part 110 close to the parking pawl 50 has a first arc groove 1101; the side of the parking pawl 50 close to the pawl hole synthesis part 110 has a second arc groove 502. When the parking pawl 50 is biased to be separated from the parking gear 10, the first arc groove 1101 and the second arc groove 502 jointly form a pawl hole 120.

[0095] Referring to Figure 9 and 10 , the pawl driving part 401 includes a first large-diameter part 4011, a first transition part 4012, and a first small-diameter part 4013 connected in sequence. The diameter of the first large-diameter part 4011 is greater than the diameter of the pawl hole 120, the diameter of the first small-diameter part 4013 is less than the diameter of the pawl hole 120, and the first small-diameter part 4013 is located within the pawl hole 120.

[0096] Among them, the parking lever 40 can be driven by the free end 302 to move, so that the first large-diameter part 4011 gradually extends into the pawl hole 120 to push the parking pawl 50 to move in the direction close to the parking gear 10.

[0097] In the embodiment of the present application, when the parking pawl 50 is biased to be separated from the parking gear 10, its second arc groove 502 and the first arc groove 1101 of the pawl hole synthesis part 110 jointly enclose the pawl hole 120. The pawl hole synthesis part 110 is fixedly connected to other fixed components in the transmission parking brake. The first small-diameter part 4013 of the pawl driving part 401 is located within the pawl hole 120, and the diameter of the first large-diameter part 4011 is greater than the diameter of the pawl hole 120. Therefore, when the parking lever 40 is driven by the free end 301 to move and the first large-diameter part 4011 gradually moves in the direction of extending into the pawl hole 120, the first large-diameter part 4011 will generate an outward driving force on the parking pawl 50, so that the parking pawl 50 overcomes the biasing force of the pawl biasing structure 60 and moves in the direction of the parking gear 10.

[0098] Optionally, continue to refer to Figure 9 and Figure 10 , the first transition portion 4012 has a variable diameter structure, the maximum diameter being equal to the diameter of the first large diameter portion 4011 and the minimum diameter being equal to the diameter of the first small diameter portion 4013. By providing the first transition portion 4012, the difficulty for the first large diameter portion 4011 to enter the pawl hole 120 can be reduced, and the parking efficiency of the transmission parking device can be improved.

[0099] Optionally, continue to refer to Figure 9 and Figure 10 , the parking lever 40 includes a lever body 402 and a first spring 403. The lever body 402 is provided with a first limiting structure 4021 and a second limiting structure 4022. The pawl driving portion 401 is sleeved outside the lever body 402 and can slide relative to the lever body 402. The first spring 403 and the pawl driving portion 401 are sequentially arranged between the first limiting structure 4021 and the second limiting structure 4022, and the first spring 403 biases the pawl driving portion 401 to abut against the second limiting structure 4022.

[0100] In the embodiment of the present application, the pawl driving portion 401 is actually a hollow structure and is sleeved outside the lever body 402 of the parking lever 40. The first spring 403 biases the pawl driving portion 401 to abut against the second limiting structure 4022. During the process that the driving lever 40 is driven by the driving rocker arm 30 to cause the pawl driving portion 401 to push the parking pawl 50 in the direction close to the parking gear 10, if the protruding portion 501 of the parking pawl 50 fails to align with the tooth groove 101 of the parking gear 10, the parking pawl 50 actually cannot be engaged with the parking gear. At this time, it is difficult for the pawl driving portion 401 to continue to push the parking pawl 50 in the direction close to the parking gear 10, and instead, it will be stuck by the parking pawl 50 and the pawl combining portion 110 and cannot continue to extend into the pawl hole 120.

[0101] Since the pawl driving portion 401 and the lever body 402 can slide relative to each other, the lever body 402 in the parking lever 40 can overcome the biasing force of the first spring 403 and slide relative to the pawl driving portion 401, and extend into the pawl hole 120 prior to the pawl driving portion 401. During this process, the first spring 403 can accumulate elastic potential energy. When the parking gear 10 rotates by a certain angle so that the protruding portion 501 of the parking pawl 50 can be engaged with any tooth groove 101, the first spring 403 releases the elastic potential energy, causing the pawl driving portion 401 to continue to push the parking pawl 50 in the direction close to the parking gear 10 until the protruding portion 501 of the parking pawl 50 is engaged with the tooth groove of the parking gear 10.

[0102] It can be seen that in the embodiment of the present application, even if the parking pawl 50 fails to engage with the tooth groove 101 of the parking gear 10 temporarily, the parking drive motor 80 will not be stalled. Instead, after the free end 302 of the parking rocker arm 30 is adsorbed by the first parking magnet 20, the power supply is cut off and it stops rotating. Subsequently, the first spring 403 releases elastic potential energy to continue driving the pawl driving part 401, so that the pawl driving part 401 continues to push the protruding part 501 of the parking pawl 50 into the parking gear 10. That is, with a simple structural design, the stable operation of the transmission parking device is ensured.

[0103] Optionally, the first limiting structure 4021 can be a protruding structure on the rod wall of the rod body 402, and the second limiting structure 4022 can be a cover plate structure at one end of the rod body 402 away from the parking rocker arm 30. The specific form of the limiting structure can be adjusted according to the actual situation.

[0104] Optionally, referring to Figure 11 the cross-sectional view of the parking pawl 50 and the pawl synthesis part 110 shown, the pawl hole 120 has a connected second large diameter part 1201 and a second small diameter part 1202. The second large diameter part 1201 is located on the side of the pawl hole 120 close to the pawl driving part 401, and the diameter of the second large diameter part 1201 is greater than that of the second small diameter part 1202.

[0105] In the embodiment of the present application, the pawl hole 120 formed by the parking pawl 50 and the pawl synthesis part 110 is actually a variable diameter hole, with a larger diameter (the second large diameter part 1201) on the side close to the pawl driving part 401 and a smaller diameter (the second small diameter part 1202, with a diameter greater than the first small diameter part 4013) on the side away from the pawl driving part 401. Referring to Figure 11 and Figure 12 , with the above settings, the difficulty for the pawl driving part 401 to extend into the pawl hole 120 is relatively low, which can improve the parking efficiency of the transmission parking device. It should be noted that when describing the diameter of the pawl hole 120, the second large diameter part 1201 or the second small diameter 1202, the state where the parking pawl 50 is biased to be separated from the parking gear 10 is used as a reference. When the parking pawl 50 is not in this biased state, the diameter of the pawl hole 120 will change and may be greater than the diameter of the first large diameter part 4011 of the pawl driving part 401.

[0106] Optionally, continuing to refer to Figure 8 , the pawl biasing structure 60 includes a spring shaft rod 601 and a second spring 602 sleeved outside the spring shaft rod 601. Both ends of the second spring 602 have extended biasing segments 6021 and fixed segments 6022 respectively. The spring shaft rod 601 and the fixed segment 6022 are fixed relative to the first parking magnet 20, and the biasing segment 6021 abuts against the parking pawl 50 and biases the parking pawl 50 to be separated from the parking gear 10.

[0107] An embodiment of the present application provides a specific example of the pawl biasing structure 60. In the embodiment of the present application, the parking pawl 50 is biased by means of a second spring 602 sleeved outside the spring shaft rod 601 to ensure that the parking pawl 50 does not interfere with the normal operation of the transmission in the non-parking state. In some embodiments, the spring shaft rod 601 can pass through the parking pawl 50 and be fixedly connected to other components of the transmission, and the fixed section 6022 can also be fixedly connected to other fixed components of the transmission or be caught by other fixed components and remain stationary.

[0108] In summary, for the transmission parking device provided by the embodiment of the present application, in the non-parking state, the parking assembly is biased to be separated from the parking gear, so as to ensure that the parking pawl does not interfere with the normal operation of the transmission when parking is not required; by means of the adsorption of the second parking magnet on the free end of the parking rocker arm, automatic locking in the non-parking state can be achieved; when parking is required, the parking drive motor and the reduction structure transmit torque to the parking rocker arm, so that the parking rocker arm rotates around the axis of its fixed end against the suction force of the second parking magnet, and then drives the pawl driving part to move. The pawl driving part can drive the parking pawl to move towards the parking gear until the protruding part of the parking pawl is stuck in the parking gear to achieve parking; by means of the adsorption of the first parking magnet on the free end of the parking rocker arm, automatic locking in the parking state can be achieved; and during the parking process, the first spring can ensure that the motor does not stall and ensure the operating stability of the transmission parking device.

[0109] On the other hand, an embodiment of the present application provides a vehicle including any one of the aforementioned transmission parking devices.

[0110] The vehicle provided by the embodiment of the present application has the aforementioned transmission parking device, which can ensure that the parking pawl does not interfere with the normal operation of the transmission when parking is not required; when parking is required, the protruding part of the parking pawl is pushed into the tooth groove of the parking gear by means of the parking rocker arm and the parking rod to achieve parking; at the same time, by means of the magnetic attraction between the parking rocker arm and the first parking magnet, the transmission parking device is automatically locked in the parking state, realizing parking locking by means of a simple part matching relationship and improving the reliability of parking.

[0111] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0112] Other embodiments of the present application will be readily apparent to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only to be considered as exemplary.

[0113] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A gearbox parking brake, characterized in that, The transmission parking device includes: a first parking magnet (20), a parking rocker arm (30), a parking rod (40), a parking pawl (50), a pawl biasing structure (60), a control unit (100), a parking drive motor (80), and a reduction structure (90). The parking rocker arm (30) has magnetism, and the parking pawl (50) has a protruding portion (501). The pawl biasing structure (60) biases the parking pawl (50) to be separated from the parking gear (10). The parking rocker arm (30) includes a fixed end (301) and a free end (302). The parking rocker arm (30) can rotate around the axis of the fixed end (301). The first parking magnet (20) is located on the movement path of the free end (302) of the parking rocker arm (30). One end of the parking rod (40) is connected to the free end (302), and the other end has a pawl driving portion (401). The pawl driving portion (401) is adjacent to the parking pawl (50). Wherein, when the free end (302) rotates around the axis of the fixed end (301) towards the direction close to the first parking magnet (20) until it is adsorbed by the first parking magnet (20), it drives the parking rod (40) to move, so that the pawl driving portion (401) overcomes the biasing force of the pawl biasing structure (60) and pushes the parking pawl (50) towards the direction close to the parking gear (10) until the protruding portion (501) of the parking pawl (50) is engaged in the tooth groove (101) of the parking gear (10). The reduction structure (90) has a reduction output shaft (904). The parking drive motor (80) has an output gear (801). The first end (9041) of the reduction output shaft (904) is connected to the output gear (801) through gear transmission. The fixed end (301) of the parking rocker arm (30) has a first mounting hole (3011). The second end (9042) of the reduction output shaft (904) is installed in the first mounting hole (3011) for driving the parking rocker arm (30) to rotate around the axis of the fixed end (301). There is an axial movement space between the first mounting hole (3011) of the fixed end (301) and the second end (9042) of the reduction output shaft (904). When the reduction output shaft (904) drives the free end (302) of the parking rocker arm (30) to rotate close to the first parking magnet (20), the axial movement space allows the parking rocker arm (30) to rotate relative to the reduction output shaft (904) under the action of magnetic suction force and be adsorbed by the first parking magnet (20). Among them, the parking drive motor (80) and the first parking magnet (20) are respectively electrically connected to the control unit (100); when the parking rocker arm (30) rotates to contact the first parking magnet (20), the control unit (100) detects a contact signal and stops supplying power to the parking drive motor (80) in response to the contact signal.

2. The transmission parking brake according to claim 1, characterized in that, The transmission parking device further includes: a second parking magnet (70); The second parking magnet (70) is located on the movement path of the free end (302) of the parking rocker arm (30), and its position is different from that of the first parking magnet (20); Among them, when the free end (302) rotates around the axis of the fixed end (301) towards the direction close to the second parking magnet (70) until it is adsorbed by the second parking magnet (70), it drives the parking rod (40) to move, so that the pushing force of the pawl driving part (401) on the parking pawl (50) gradually weakens until the pushing force is 0.

3. The transmission parking brake according to claim 2, characterized in that, The deceleration structure (90) further includes a first deceleration gear (901), a second deceleration gear (902) and a third deceleration gear (903); The first deceleration gear (901) meshes with the output gear (801), the second deceleration gear (902) is coaxial with the first deceleration gear (901), and the diameter of the second deceleration gear (902) is smaller than that of the first deceleration gear (901). The third deceleration gear (903) meshes with the second deceleration gear (902), and the diameter of the third deceleration gear (903) is larger than that of the second deceleration gear (902). The third deceleration gear (903) is fixedly sleeved on the first end (9041) of the deceleration output shaft (904).

4. The transmission parking brake according to claim 3, characterized in that, The second parking magnet (70) is electrically connected to the control unit (100). When the deceleration output shaft (904) drives the free end (302) of the parking rocker arm (30) to rotate close to the second parking magnet (70), the axial movement space allows the parking rocker arm (30) to rotate relative to the deceleration output shaft (904) under the action of magnetic suction and be adsorbed by the second parking magnet (70); Among them, when the parking rocker arm (30) rotates to contact the second parking magnet (70), the control unit (100) detects a contact signal and stops supplying power to the parking drive motor (80) in response to the contact signal.

5. The transmission parking brake according to claim 4, characterized in that, The second end (9042) of the deceleration output shaft (904) has a cross-section with two ends being first arcs (90421); The two ends of the cross-section of the first mounting hole (3011) of the fixed end (301) are second arcs (30113) and narrow from the two second arcs (30113) towards the middle section (30114). When the second end (9042) is located in the first mounting hole (3011), the first arc (90421) contacts the corresponding second arc (30113) and can slide along it, so that the first mounting hole (3011) allows the second end (9042) to rotate around the center of the first mounting hole (3011) within the first mounting hole (3011).

6. The transmission parking brake according to claim 3, characterized in that, The free end (302) moves from the position in contact with the first parking magnet (20) to the position in contact with the second parking magnet (70), and the angle of rotation around the axis of the fixed end (301) is 180 degrees. The third reduction gear (903) is a sector gear with a radian greater than π.

7. The transmission parking brake according to any one of claims 1-6, characterized in that, The transmission parking device further includes a pawl hole combining part (110). The side of the pawl hole combining part (110) close to the parking pawl (50) has a first arc-shaped groove (1101); the side of the parking pawl (50) close to the pawl hole combining part (110) has a second arc-shaped groove (502). When the parking pawl (50) is biased to be separated from the parking gear (10), the first arc-shaped groove (1101) and the second arc-shaped groove (502) jointly form a pawl hole (120). The pawl driving part (401) includes a first large-diameter part (4011), a first transition part (4012), and a first small-diameter part (4013) connected in sequence. The diameter of the first large-diameter part (4011) is larger than the diameter of the pawl hole (120), the diameter of the first small-diameter part (4013) is smaller than the diameter of the pawl hole (120), and the first small-diameter part (4013) is located within the pawl hole (120). Among them, the parking lever (40) can be driven by the free end (302) to move, so that the first large-diameter part (4011) gradually extends into the pawl hole (120) to push the parking pawl (50) to move towards the direction close to the parking gear (10).

8. The transmission parking brake according to claim 7, characterized in that, The parking lever (40) includes a lever body (402) and a first spring (403). The lever body (402) has a first limiting structure (4021) and a second limiting structure (4022). The pawl driving part (401) is sleeved outside the lever body (402) and can slide relative to the lever body (402). The first spring (403) and the pawl driving part (401) are sequentially distributed between the first limiting structure (4021) and the second limiting structure (4022), and the first spring (403) biases the pawl driving part (401) to abut against the second limiting structure (4022).

9. The transmission parking brake according to claim 7, characterized in that, The pawl hole (120) has a connected second large-diameter portion (1201) and a second small-diameter portion (1202). The second large-diameter portion (1201) is located on the side of the pawl hole (120) close to the pawl driving portion (401), and the diameter of the second large-diameter portion (1201) is larger than that of the second small-diameter portion (1202).

10. The transmission parking brake according to claim 1, characterized in that, The pawl biasing structure (60) includes a spring shaft (601) and a second spring (602) sleeved outside the spring shaft (601). Both ends of the second spring (602) respectively have an extended biasing section (6021) and a fixed section (6022). The spring shaft (601) and the fixed section (6022) are fixed relative to the first parking magnet (20). The biasing section (6021) abuts against the parking pawl (50) and biases the parking pawl (50) to be separated from the parking gear (10).

11. A vehicle, characterized in that, A transmission parking device includes the one according to any one of claims 1-10.

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