Door lock and vehicle

Abstract

The present invention belongs to the technical field of vehicles, and discloses a door lock and a vehicle. The door lock includes a mounting plate, a ratchet wheel, a lock catch and a pawl. A channel for the lock catch to move is provided on the mounting plate. The ratchet wheel is rotatably connected to the mounting plate. The capture groove formed on the ratchet wheel has a first working position where the opening direction forms an angle with the extending direction of the channel, and a second working position where the opening direction coincides with the extending direction of the channel. The pawl is provided with a mounting groove, and a rolling block is arranged in the mounting groove. The pawl is rotatably connected to the mounting plate and has a third working position where the rolling block is located on the rotation path of the ratchet wheel, and a fourth working position where the rolling block is away from the rotation path. When the pawl rotates from the third working position to the fourth working position, the rolling block rolls relative to the ratchet wheel, so that it is relatively labor-saving for manual door opening or a small-power driving member can be adopted for the actuator. For the vehicle using the above door lock, it is relatively labor-saving to open the door, or its actuator adopts a driving member with a relatively small power.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a door lock and a vehicle. Background Art

[0002] The door lock of an automobile generally relies on a ratchet and pawl structure provided on its door and a lock catch provided on the vehicle body to achieve. Among them, the ratchet and pawl structure keeps the door in an open or closed state by controlling the relative positions of the ratchet and the pawl.

[0003] Specifically, during the closing process of the door, the lock catch impacts the ratchet, causing the ratchet to rotate to capture the lock catch. When the door reaches the closed position, the pawl stops the ratchet, restricting the ratchet from rotating back, so that the door remains closed. A release mechanism capable of opening the door lock is connected to the pawl, so that by actuating the pawl to release the ratchet, the ratchet can rotate to achieve the opening of the door lock.

[0004] In the prior art, when the door is in the closed position, the pawl abuts against the ratchet, and the pawl can rotate to release the ratchet. However, since the friction generated between the pawl and the ratchet during the rotation of the pawl to release the ratchet in the prior art is sliding friction, the sliding friction force generates a relatively large frictional torque with respect to the rotation axis of the pawl, resulting in a relatively large release force for rotating the pawl. And the power source of the release mechanism for applying the release force to the pawl is generally manual or actuator-driven, thus making it relatively laborious to open the door manually or the actuator needs to use a driving member with a relatively large power.

[0005] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] The purpose of the present invention is to provide a door lock and a vehicle to solve the problem that it is relatively laborious to open the door manually or the actuator needs to use a driving member with a relatively large power.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] On the one hand, the present invention provides a door lock, including a mounting plate, a ratchet and a lock catch. A channel for the movement of the lock catch is provided on the mounting plate. The ratchet is rotatably connected to the mounting plate through a first rotating shaft. A capture groove is provided on the ratchet. The capture groove has a first working position where the opening direction forms an angle with the extending direction of the channel, and a second working position where the opening direction coincides with the extending direction of the channel. The door lock further includes:

[0009] The pawl is provided with an installation groove, a rolling block is arranged in the installation groove, the pawl is rotatably connected to the installation plate through a second rotating shaft, and has a third working position where the rolling block is located on the rotation path of the ratchet wheel from the first working position to the second working position, and a fourth working position where the rolling block is away from the rotation path. When the pawl rotates from the third working position to the fourth working position, the rolling block can roll relative to the ratchet wheel.

[0010] Preferably, when the pawl rotates from the third working position to the fourth working position, the rolling block can abut against the ratchet wheel and form a line contact, the rolling block can rotate relative to the pawl, and the rotation direction of the rolling block relative to the pawl is opposite to the rotation direction of the pawl relative to the ratchet wheel.

[0011] Preferably, a first arc surface is formed on the groove wall of the installation groove, a second arc surface is formed on the ratchet wheel, a third arc surface is arranged on the rolling block, the second arc surface can abut against the third arc surface, the third arc surface includes a first arc-shaped portion, the first arc-shaped portion fits with the first arc surface. When the pawl is in the third working position, the center of the circle where the second arc surface is located is on the axis of the second rotating shaft, the center of the circle where the first arc-shaped portion is located coincides with the rotation center of the rolling block relative to the pawl, and the circle where the first arc-shaped portion is located is tangent to the circle where the second arc surface is located.

[0012] Preferably, the car door lock further includes a first limit block. When the capture groove is in the first working position, the ratchet wheel abuts between the first limit block and the rolling block.

[0013] Preferably, the car door lock further includes a second limit block and a third limit block. When the pawl is in the third working position, the rolling block abuts against the second limit block, and the side of the pawl away from the rolling block abuts against the third limit block, and the second limit block and the third limit block are respectively located on both sides of the pawl along its rotation direction.

[0014] Preferably, there is a spacing between the second limit block and the ratchet wheel along the extension direction of the first rotating shaft.

[0015] Preferably, the car door lock further includes a spring. The spring is connected to the pawl, and the spring and the third limit block are respectively located on both sides of the pawl along its rotation direction. When the pawl rotates from the third working position to the fourth working position, the spring can undergo elastic deformation and has an elastic potential energy that enables the pawl to return to the third working position after the ratchet wheel is switched from the second working position to the first working position.

[0016] Preferably, when the ratchet is in the second working position, the pawl and the rolling block abut against the first engaging surface of the ratchet.

[0017] Preferably, the ratchet is provided with a protrusion, the first engaging surface is formed on the protrusion, and the ratchet is further provided with a second engaging surface. During the rotation of the ratchet from the second working position to the first working position, the pawl can be restored from the fourth working position to the third working position and can abut against the second engaging surface.

[0018] On the other hand, the present invention also provides a vehicle including the door lock as described above.

[0019] Advantages of the present invention: In the present invention, during the process of releasing the ratchet, the rolling friction force between the ratchet and the rolling block hinders the pawl. The rolling friction force is relatively small compared to the frictional torque generated by the second rotating shaft, so that the release force for rotating the pawl is small. When the power source of the release mechanism is manual, since the required release force is small, it is relatively labor-saving to open the door manually. When the power source of the release mechanism is actuator-driven, since the required release force is small, the actuator only needs to adopt a low-power driving member. For a vehicle equipped with the above door lock, it is relatively labor-saving to open the door, or the actuator on the vehicle equipped with the above door lock can adopt a driving member with a relatively low power. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the door lock when the pawl is in the third working position in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the door lock when the pawl rotates from the third working position to the fourth working position in an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the door lock when the capture groove is in the second working position in an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the door lock when the pawl abuts against the second engaging surface in an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of the pawl and the second rotating shaft in an embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of the rolling block in an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of the force analysis of the rolling block in an embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the force analysis of the pawl in the embodiment of the present invention.

[0028] In the figure:

[0029] 1. Mounting plate; 11. Channel;

[0030] 2. Ratchet wheel; 21. Capture groove; 22. Second arc surface; 23. Protrusion; 231. First engagement surface; 24. Second engagement surface;

[0031] 3. Lock;

[0032] 4. First rotating shaft;

[0033] 5. Pawl; 51. Mounting groove; 511. First arc surface;

[0034] 6. Rolling block; 611. First arc-shaped part; 612. Second arc-shaped part;

[0035] 7. Second rotating shaft;

[0036] 81. First limiting block; 82. Second limiting block; 83. Third limiting block;

[0037] 9. Spring. Detailed implementation manners

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Please refer to Figures 1 to 6 , this embodiment provides a car door lock, which includes a mounting plate 1, a ratchet wheel 2 and a latch 3. Among them, the mounting plate 1 is fixedly connected to the car door, the latch 3 is fixedly connected to the vehicle body, a channel 11 for the movement of the latch 3 is provided on the mounting plate 1, the ratchet wheel 2 is rotatably connected to the mounting plate 1 through a first rotating shaft 4, a capture groove 21 is provided on the ratchet wheel 2, the capture groove 21 has a first working position where the opening direction forms an angle with the extending direction of the channel 11, and a second working position where the opening direction coincides with the extending direction of the channel 11. When the capture groove 21 is in the first working position, the ratchet wheel 2 is stopped, so that the latch 3 cannot move relative to the mounting plate 1, thereby keeping the car door in the closed position. When the ratchet wheel 2 is released, the ratchet wheel 2 can rotate to make the capture groove 21 switch from the first working position to the second working position. When the capture groove 21 is in the second working position, the latch 3 can move relative to the mounting plate 1 along the extending direction of the channel 11 and move out of the capture groove 21, thereby unlocking the car door and enabling the car door to be opened.

[0043] In addition to including the mounting plate 1, the ratchet wheel 2 and the latch 3, the car door lock in this embodiment further includes a pawl 5. The pawl 5 is provided with a mounting groove 51, a rolling block 6 is arranged in the mounting groove 51. The pawl 5 is rotatably connected to the mounting plate 1 through a second rotating shaft 7, and has a third working position where the rolling block 6 is located on the rotation path of the ratchet wheel 2 rotating from the first working position to the second working position, and a fourth working position where the rolling block 6 is away from the rotation path. When the pawl 5 rotates from the third working position to the fourth working position, the rolling block 6 can roll relative to the ratchet wheel 2.

[0044] That is, in this embodiment, during the process of releasing the ratchet wheel 2, the rolling friction force between the ratchet wheel 2 and the rolling block 6 hinders the pawl 5. The rolling friction force generates a relatively small frictional torque with respect to the second rotating shaft 7, such that the release force for rotating the pawl 5 is relatively small. When the power source of the release mechanism is manual, since the required release force is small, it is relatively labor-saving to open the door manually. When the power source of the release mechanism is actuator-driven, since the required release force is small, the actuator only needs to use a low-power driving component.

[0045] Preferably, when the pawl 5 rotates from the third working position to the fourth working position, the rolling block 6 can abut against the ratchet wheel 2 and form a line contact. The rolling block 6 is movably arranged in the mounting groove 51. The rolling block 6 can rotate relative to the pawl 5 when the pawl 5 rotates from the third working position to the fourth working position, and the rotation direction of the rolling block 6 relative to the pawl 5 is opposite to the rotation direction of the pawl 5 relative to the ratchet wheel 2. Specifically, when the pawl 5 is in the third working position, the rolling block 6 abuts against the ratchet wheel 2 to stop the ratchet wheel 2. When the pawl 5 rotates from the third working position to the fourth working position, the rolling block 6 can rotate around the second rotating shaft 7 together with the pawl 5. At the same time, the rolling block 6 will rotate relative to the pawl 5. During the process of the rolling block 6 rotating relative to the pawl 5, each position on the rolling block 6 abuts against the ratchet wheel 2 in turn during the process of the rolling block 6 rotating around the second rotating shaft 7 together with the pawl 5. Based on the foregoing, the contact between the rolling block 6 and the ratchet wheel 2 is a line contact, that is, each position on the rolling block 6 forms a line contact with the ratchet wheel 2 when abutting against the ratchet wheel 2, so that the rolling block 6 rolls along the outer wall of the ratchet wheel 2.

[0046] Exemplarily, the ratchet wheel 2 in this embodiment can rotate from the first working position to the second working position in the counterclockwise direction around the first rotating shaft 4. It can be understood that when the pawl 5 is in the fourth working position, the latch 3 applies a thrust force to the ratchet wheel 2 to cause the ratchet wheel 2 to rotate from the first working position to the second working position. And when the ratchet wheel 2 is in the first working position, the latch 3 can also apply the above-mentioned thrust force to the ratchet wheel 2, so that the ratchet wheel 2 has a tendency to rotate from the first working position to the second working position. The pawl 5 can rotate from the third working position to the fourth working position in the counterclockwise direction around the second rotating shaft 7. When the pawl 5 rotates in the counterclockwise direction around the second rotating shaft 7, the rolling block 6 can rotate in the clockwise direction relative to the pawl 5, so that each position on the rolling block 6 along the rotation direction of the pawl 5 abuts against the ratchet wheel 2 in turn, and each position on the rolling block 6 along the rotation direction of the pawl 5 forms a line contact with the ratchet wheel 2 when abutting against the ratchet wheel 2, that is, the rolling block 6 rolls along the outer wall of the ratchet wheel 2. When the pawl 5 rotates to the fourth working position, the rolling block 6 disengages from the abutment with the ratchet wheel 2, and the ratchet wheel 2 rotates from the first working position to the second working position in the counterclockwise direction under the action of the latch 3.

[0047] Further, a first arc surface 511 is formed on the groove wall of the installation groove 51 in this embodiment, a second arc surface 22 is formed on the ratchet wheel 2, a third arc surface is provided on the rolling block 6, the second arc surface 22 can be in contact with the third arc surface, the third arc surface includes a first arc-shaped portion 611, the first arc-shaped portion 611 fits with the first arc surface 511. When the pawl 5 is in the third working position, the center of the circle where the first arc-shaped portion 611 is located coincides with the rotation center of the rolling block 6 relative to the pawl 5, and the first arc-shaped portion 611 fits with the first arc surface 511. Therefore, the first arc-shaped portion 611 will slide along the first arc surface 511, so as to ensure that while the pawl 5 limits the rolling block 6, it will not affect the rotation of the rolling block 6. The circle where the first arc-shaped portion 611 is located is tangent to the circle where the second arc surface 22 is located, and the third arc-shaped portion is in contact with the second arc surface 22, so that a line contact is formed between the rolling block 6 and the ratchet wheel 2. When the rolling block 6 rotates relative to the pawl 5, it is still in line contact with the ratchet wheel 2. In this embodiment, the center of the circle where the second arc surface 22 is located is on the axis of the second rotating shaft 7, so that the second arc surface 22 will not interfere with the rotation of the ratchet wheel 2 and the rolling block 6 relative to the second rotating shaft 7, and the rolling block 6 can roll along the second arc surface 22 both before and after rotating relative to the pawl 5.

[0048] When the pawl 5 rotates around the second rotating shaft 7 from the third working position to the fourth working position, the groove wall on the side of the installation groove 51 opposite to the first arc surface 511 pushes against the rolling block 6. Based on the foregoing, since when the ratchet wheel 2 is in the first working position, the lock 3 can apply a thrust to the ratchet wheel 2 to make the ratchet wheel 2 have a tendency to rotate from the first working position to the second working position. In this embodiment, the frictional torque generated by the frictional force between the first arc-shaped portion 611 and the first arc surface 511 is much smaller than the frictional torque generated by the frictional force between the ratchet wheel 2 and the rolling block 6. Under the action of the ratchet wheel 2 and the pawl 5, the rolling block 6 will rotate relative to the pawl 5, and the rotation direction of the rolling block 6 relative to the pawl 5 is opposite to the rotation direction of the pawl 5 relative to the ratchet wheel 2. At the same time, as the rolling block 6 and the pawl 5 rotate around the second rotating shaft 7 together, relative rolling is generated between the rolling block 6 and the ratchet wheel 2, and relative sliding is generated between the rolling block 6 and the pawl 5.

[0049] It can be understood that in this embodiment, the maximum distance between the intersection points of the straight line passing through the rotation center of the rolling block 6 and the third arc surface of the rolling block 6 and the wall surface on the side of the rolling block 6 opposite to the third arc surface is greater than the maximum distance between the first arc surface 511 of the installation groove 51 and the groove wall on the side opposite to the first arc surface 511, so as to ensure that the rolling block 6 will not slide out of the installation groove 51 when rotating relative to the pawl 5.

[0050] It should be noted that the third arc surface in this embodiment further includes a second arc portion 612. The second arc portion 612 is located on the downstream side of the first arc portion 611 along the rotation direction of the rolling block 6 relative to the pawl 5 when the pawl 5 rotates from the third working position to the fourth working position, so as to form an arc transition between the first arc portion 611 and other parts of the rolling block 6, increasing the strength of the rolling block 6. At the same time, the circumferences where the second arc portion 612 is located, the circumference where the first arc portion 611 is located, and the circumference where the second arc surface 22 is located are tangent to each other, so as to ensure that even when the pawl 5 abuts against the second arc portion 612 when it is in the third working position, the rolling block 6 and the ratchet wheel 2 are still in line contact, and during the process of the pawl 5 rotating from the third working position to the fourth working position, all positions of the rolling block 6 along the rotation direction of the pawl 5 are still in line contact with the ratchet wheel 2 when abutting against the ratchet wheel 2.

[0051] Preferably, the door lock in this embodiment further includes a first limit block 81. When the capture groove 21 is in the first working position, the ratchet wheel 2 abuts between the first limit block 81 and the rolling block 6, and the first limit block 81 can prevent the ratchet wheel 2 from rotating away from the pawl 5 and the rolling block 6.

[0052] Furthermore, the door lock in this embodiment further includes a second limit block 82 and a third limit block 83. When the pawl 5 is in the third working position, the rolling block 6 abuts against the second limit block 82, and the side of the pawl 5 away from the rolling block 6 abuts against the third limit block 83, and the second limit block 82 and the third limit block 83 are respectively located on both sides of the pawl 5 along its rotation direction, that is, the second limit block 82 and the third limit block 83 can ensure that the pawl 5 is accurately held in the third working position, so as to ensure that the rolling block 6 can accurately stop the ratchet wheel 2.

[0053] It can be understood that in this embodiment, the pawl 5 can rotate from the third working position to the fourth working position counterclockwise around the second rotating shaft 7. In order to enable the pawl 5 to rotate from the third working position to the fourth working position, the third limit block 83 abuts against the upstream side of the pawl 5 in the counterclockwise direction, while the second limit block 82 abuts against the downstream side of the rolling block 6 in the clockwise direction. When the pawl 5 is in the fourth working position, the ratchet wheel 2 can rotate counterclockwise. To avoid the second limit block 82 interfering with the rotation of the ratchet wheel 2, there is a distance between the second limit block 82 and the ratchet wheel 2 along the extension direction of the first rotating shaft 4 in this embodiment, that is, the second limit block 82 and the ratchet wheel 2 are arranged at intervals along the extension direction of the first rotating shaft 4. Correspondingly, the rolling block 6 in this embodiment has a certain height along the extension direction of the first rotating shaft 4, so as to ensure that the rolling block 6 can abut against the second limit block 82.

[0054] In this embodiment, the door lock further includes a spring 9. The spring 9 is connected to the pawl 5. The spring 9 and the third limiting block 83 are respectively located on both sides of the pawl 5 along its rotation direction. Based on the above, the spring 9 in this embodiment is located on the downstream side of the pawl 5 along the counterclockwise direction. When the pawl 5 rotates from the third working position to the fourth working position, the spring 9 can be compressed and thus elastically deformed, and has an elastic potential energy that enables the pawl 5 to return to the third working position after the ratchet wheel 2 is switched from the second working position to the first working position. Specifically, when the ratchet wheel 2 rotates to the first working position, the latch 3 can be moved out of the capture groove 21, thereby realizing the opening of the door lock. When the door needs to be closed, the latch 3 impacts the ratchet wheel 2 during the closing process of the door, so that the ratchet wheel 2 returns from the second working position to the first working position. When the ratchet wheel 2 returns to the first working position, the spring 9 resumes deformation, causing the pawl 5 to return from the fourth working position to the third working position, and the rolling block 6 restarts to stop the ratchet wheel 2.

[0055] Further, a first engagement surface 231 is provided on the ratchet wheel 2 in this embodiment. When the pawl 5 is in the fourth working position, the ratchet wheel 2 rotates from the first working position to the second working position. When the ratchet wheel 2 is in the second working position, the release mechanism cancels the release force applied to the pawl 5, and the pawl 5 and the rolling block 6 can abut against the first engagement surface 231 of the ratchet wheel 2 to keep the pawl 5 in the fourth working position. When the rolling block 6 abuts against the first engagement surface 231 of the ratchet wheel 2, the spring 9 will resume partial deformation, thereby restoring the position of the rolling block 6. Specifically, based on the content described above, when the pawl 5 rotates from the third working position to the fourth working position, the rolling block 6 can rotate relative to the pawl 5 in the clockwise direction. When the rolling block 6 abuts against the first engagement surface 231 of the ratchet wheel 2, the rolling block 6 can rotate relative to the pawl 5 in the counterclockwise direction, thereby realizing the position restoration.

[0056] Based on the above, in this embodiment, the ratchet wheel 2 is provided with a protruding portion 23, and the protruding portion 23 forms a first engaging surface 231. The ratchet wheel 2 is further provided with a second engaging surface 24. During the rotation of the ratchet wheel 2 from the second working position to the first working position, the pawl 5 can be restored from the fourth working position to the third working position and can abut against the second engaging surface 24. That is, the first engaging surface 231 and the second engaging surface 24 are arranged in a stepped manner. During the process of closing the vehicle door, the spring 9 will continue to restore its deformation, and the pawl 5 will change from abutting against the first engaging surface 231 to abutting against the second engaging surface 24. When the pawl 5 abuts against the second engaging surface 24, the rolling block 6 abuts against the protruding portion 23 to stop the ratchet wheel 2, so that the vehicle door is held in the half-open state. When the ratchet wheel 2 continues to rotate to the first working position under the action of the latch 3, the pawl 5 can be pushed by the second engaging surface 24 of the ratchet wheel 2 and rotate from the third working position to the fourth working position, and the spring 9 is compressed and deformed. After the ratchet wheel 2 rotates to the first working position, the spring 9 restores its deformation, and the pawl 5 restores to the third working position, and the rolling block 6 abuts against the second arc surface 22 to stop the ratchet wheel 2, thereby closing the vehicle door.

[0057] That is, in this embodiment, by providing the protruding portion 23, the vehicle door can be held in the half-open state during the closing process.

[0058] Based on the foregoing, such as Figure 1 and Figures 5 to 8As shown, in this embodiment, the normal pressure of the ratchet wheel 2 on the rolling block 6 is set as F1, the frictional force between the ratchet wheel 2 and the rolling block 6 is F2, and the pressure of the pawl 5 on the rolling block 6 is decomposed into F3 and F4. The sliding frictional moment of the pawl 5 on the rolling block 6 is M1, and the rolling frictional moment of the ratchet wheel 2 on the rolling block 6 is M2. The thrust that the latch 3 exerts on the ratchet wheel 2 to make the ratchet wheel 2 tend to rotate from the first working position to the second working position is F5. The distance between the second rotating shaft 7 and the rotation center of the rolling block 6 is d, the major diameter of the rolling block 6 is R1, the minor diameter of the rolling block 6 is R2, the sliding friction coefficient is μ, the rolling friction coefficient is δ, the transmission ratio between the ratchet wheel 2 and the pawl 5 is k, and the radius of the second rotating shaft 7 is R3. Among them, F2 = F3, F2 * R1 = M1 + M2, M1 = μ * F1 * R2, M2 = δ * F1, F5 = F1 * k, F4 = F1. In this embodiment, the eccentricity of the normal pressure F1 of the ratchet wheel 2 on the rolling block 6 due to material deformation is ignored. At the same time, the numerical value of the resultant force of other forces on the rolling block 6 except the normal pressure F1 of the ratchet wheel 2 on the rolling block 6 is equal to the numerical value of the normal pressure F1 of the ratchet wheel 2 on the rolling block 6. Based on the above, we get: F6 = F4', M3 = M2' + M1' + M4 + M5 + F3' * d, M4 = μ * F6 * R3. Among them, F6 is a component force of the force of the second rotating shaft 7 on the pawl 5, and the other component force is F7. F3' and F4' are the reaction forces of F3 and F4 respectively, M1' and M2' are the reaction moments of M1 and M2 respectively, M3 is the moment of the release force on the second rotating shaft 7, M4 is the sliding frictional moment between the second rotating shaft 7 and the pawl 5, and M5 is the moment of the elastic force of the spring 9 on the second rotating shaft 7. Thus, we can obtain: M3 = F1 * (μ * R2 + δ + μ * R3 + d / R1 * (δ + μ * R2)) + M5. In order to facilitate the calculation of the release moment of the vehicle door lock in the prior art, the vehicle door lock in the prior art can be analogized to fixedly installing a rolling block 6 in this embodiment on the pawl. Correspondingly, the value of the release moment M3' of the vehicle door lock in the prior art is: M3' = F1 * μ * (R3 + d) + M5. Exemplarily, when R2 = 1, R1 = 6, μ = 0.15, δ = 0.05, k = 2.3, R3 = 3.5, d = 12, M3' = 2.325F1 + M5, M3 = 1.125F1 + M5. Comparing M3 and M3', it can be seen that the moment of the release force required for the second rotating shaft 7 in this embodiment can be greatly reduced, so that the required release force can be greatly reduced.

[0059] This embodiment also provides a vehicle, which includes the vehicle door lock as described above. In this embodiment, it is easier to open the vehicle door, or the actuator on the vehicle can adopt a driving member with a smaller power.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Door lock, comprising a mounting plate (1), a ratchet wheel (2) and a latch (3), wherein a channel (11) for the movement of the latch (3) is provided on the mounting plate (1), the ratchet wheel (2) is rotatably connected to the mounting plate (1) through a first rotating shaft (4), a capture groove (21) is formed on the ratchet wheel (2), the capture groove (21) has a first working position in which the opening direction forms an angle with the extending direction of the channel (11), and a second working position in which the opening direction coincides with the extending direction of the channel (11), characterized in that, The door lock further includes: A pawl (5) is provided with an installation groove (51), and a rolling block (6) is arranged in the installation groove (51). The pawl (5) is rotatably connected to the mounting plate (1) through a second rotating shaft (7), and has a third working position where the rolling block (6) is located on the rotation path of the ratchet wheel (2) rotating from the first working position to the second working position, and a fourth working position where the rolling block (6) is away from the rotation path. When the pawl (5) rotates from the third working position to the fourth working position, the rolling block (6) can roll relative to the ratchet wheel (2); When the pawl (5) rotates from the third working position to the fourth working position, the rolling block (6) abuts against the ratchet wheel (2) and forms a line contact. The rolling block (6) can rotate relative to the pawl (5), and the rotation direction of the rolling block (6) relative to the pawl (5) is opposite to the rotation direction of the pawl (5) relative to the ratchet wheel (2); A first arc surface (511) is formed on the groove wall of the installation groove (51), a second arc surface (22) is formed on the ratchet wheel (2), and a third arc surface is arranged on the rolling block (6). The third arc surface includes a first arc portion (611), and the first arc portion (611) fits with the first arc surface (511). The second arc surface (22) can abut against the third arc surface; The maximum distance between the intersection points of the straight line passing through the rotation center of the rolling block (6) and the third arc surface of the rolling block (6) and the wall surface on the side opposite to the third arc surface of the rolling block (6) is greater than the maximum distance between the first arc surface (511) of the installation groove (51) and the groove wall on the side opposite to the first arc surface (511).

2. The car door lock according to claim 1, characterized in that, When the pawl (5) is in the third working position, the center of the circle where the second arc surface (22) is located is on the axis of the second rotating shaft (7), the center of the circle where the first arc portion (611) is located coincides with the rotation center of the rolling block (6) relative to the pawl (5), and the circle where the first arc portion (611) is located is tangent to the circle where the second arc surface (22) is located.

3. The car door lock according to claim 1, characterized in that, The door lock further includes a first limit block (81). When the capture groove (21) is in the first working position, the ratchet wheel (2) abuts between the first limit block (81) and the rolling block (6).

4. The door lock according to claim 1, characterized in that, The door lock further includes a second limit block (82) and a third limit block (83). When the pawl (5) is in the third working position, the rolling block (6) abuts against the second limit block (82), and the side of the pawl (5) away from the rolling block (6) abuts against the third limit block (83), and the second limit block (82) and the third limit block (83) are respectively located on both sides of the pawl (5) along its rotation direction.

5. The door lock according to claim 4, characterized in that, There is a distance between the second limit block (82) and the ratchet wheel (2) along the extension direction of the first rotating shaft (4).

6. The door lock according to claim 5, characterized in that The door lock further includes a spring (9), the spring (9) is connected to the pawl (5), the spring (9) and the third limiting block (83) are respectively located on both sides of the pawl (5) along its rotation direction. When the pawl (5) rotates from the third working position to the fourth working position, the spring (9) can undergo elastic deformation and has an elastic potential energy that enables the pawl (5) to return to the third working position after the ratchet wheel (2) is switched from the second working position to the first working position.

7. The door lock according to claim 6, characterized in that When the ratchet wheel (2) is in the second working position, the pawl (5) and the rolling block (6) are in contact with the first engagement surface (231) of the ratchet wheel (2).

8. The door lock according to claim 7, characterized in that, The ratchet wheel (2) is provided with a protrusion (23), the protrusion (23) forms the first engagement surface (231), the ratchet wheel (2) is further provided with a second engagement surface (24). During the rotation of the ratchet wheel (2) from the second working position to the first working position, the pawl (5) can return from the fourth working position to the third working position and can be in contact with the second engagement surface (24).

9. A vehicle, characterized in that, Comprising a door lock according to any one of claims 1-8.

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