Internal-groove wheel friction pawl mechanism, anti-overrun mechanism and gravity self-braking device

Abstract

The inner-groove wheel friction pawl mechanism of the present application comprises the following main components: built-in friction pawl, inner annular friction groove wheel, and transmission cam. The anti-overrun mechanism comprises the following main components: anti-overrun drive cam, transmission pawl, and force cam. The gravity self-braking device formed on the basis of the inner-groove wheel friction pawl mechanism and the anti-overrun mechanism provides a general mechanical transmission component for the field of automobile engineering and hoisting machinery technology. The gravity self-braking device automatically generates braking force to prevent the weight from falling under the design condition of meeting the self-locking angle of the inner annular friction groove wheel and the built-in friction pawl. When the mechanism is restarted, it can normally transmit the motion in both clockwise and counterclockwise directions. This gravity self-braking mechanism has a positive effect on improving the performance of the anti-slip device for starting on an uphill road. The present application has the advantages of reducing energy consumption and improving the reliability of the working mechanism.

Description

Technical Field

[0001] This invention relates to the fields of general mechanical engineering technology, hoisting machinery and automotive engineering technology, and belongs to the transmission mechanism components in mechanical transmission systems. Specifically, it relates to an inner grooved wheel friction pawl mechanism, an overrunning prevention mechanism and a gravity self-braking device. Background Technology

[0002] A common technical characteristic in the fields of automotive engineering and crane machinery is the need to overcome the work done by gravity. When a vehicle is driving on a slope or a crane hook is raising or lowering, braking is required during moments of machine interruption to overcome the backward slippage caused by gravity. Invention patents No. 2011101074884 and No. 201710232765.1 propose solutions for preventing backward slippage when starting a vehicle on an incline and for preventing overtaking via intermittent mechanisms at the end of a vehicle's direction change.

[0003] To overcome slippage caused by gravity, lifting machinery commonly employs normally closed spring-force brakes. During lifting operations, the hydraulic or electromagnetic jacking mechanism and the winch motor are simultaneously energized, disengaging the brake spring and allowing the winch motor to drive the lifting hook normally. When the machine stops operating, the hydraulic or electromagnetic jacking mechanism and the winch motor are simultaneously de-energized, automatically releasing the brake spring force and providing braking force to the brake wheel, thus preventing the lifting hook and load from slipping.

[0004] The existing transmission systems of automobiles, especially freight trucks and hoisting machinery winches, need a mechanism that can automatically generate braking torque using the weight of the vehicle or heavy load without consuming additional energy, and can improve the starting performance of internal combustion engines or electric motors under load, so as to meet the performance requirements of hoisting winches and heavy-duty trucks. Summary of the Invention

[0005] The first objective of this invention is to provide an internal grooved wheel friction pawl mechanism and an anti-overrunning mechanism, which are applied to transmission devices that need to overcome gravity to perform work. They can transmit continuous motion in both forward and reverse rotational directions. In the rotational direction of the falling weight, an anti-overrunning mechanism is provided to ensure the normal operation of the mechanism. When the input power of the mechanism's input shaft is cut off in some way, the weight of the weight will automatically generate braking force to prevent the weight from falling. When the mechanism restarts, it will transmit motion in both forward and reverse rotational directions normally.

[0006] The second objective of this invention is to design a gravity self-braking device based on the aforementioned inner groove wheel friction pawl mechanism and an anti-overrunning mechanism, which can be widely applied in the fields of automotive engineering and crane machinery technology.

[0007] The present invention relates to an internal grooved wheel friction pawl mechanism, comprising: a housing, an input shaft, an output shaft, a driven disk, and a force transmission pin, wherein the driven disk is fixedly connected to the output shaft; characterized in that: it further comprises a built-in friction pawl, an inner annular friction grooved wheel, and a transmission cam; the friction working surface of the built-in friction pawl is an outer trapezoidal cross-section, the inner annular friction grooved wheel is fixedly mounted on the housing, the friction working surface of the inner annular friction grooved wheel is an inner trapezoidal cross-section ring, and the friction working surface of the built-in friction pawl is in contact with the friction working surface of the inner annular friction grooved wheel.

[0008] The inner groove wheel friction pawl mechanism is characterized in that: the built-in friction pawl is further provided with a right-handed flange and a left-handed flange; at least one of the built-in friction pawls is hinged to the driven disk through the force transmission pin, and according to the needs of mechanical performance and mechanical conditions, several of the built-in friction pawls can be hinged to the driven disk in a circumferentially evenly distributed manner.

[0009] The inner grooved wheel friction pawl mechanism is characterized in that: the transmission cam is fixedly mounted on the input shaft, and the transmission cam is provided with a left-hand drive flange and a right-hand drive flange corresponding to the number of built-in friction pawls, and the left-hand drive flange and the right-hand drive flange of the transmission cam respectively contact the left-hand flange and the right-hand flange of the built-in friction pawl.

[0010] The inner grooved wheel friction pawl mechanism is characterized in that it further includes a stop block and a return spring, the number of the stop block and the return spring corresponding to the number of the built-in friction pawl, the stop block being fixedly connected to the driven disc, the return spring being installed in the mounting hole of the stop block, and one end of the return spring contacting the built-in friction pawl.

[0011] An overtaking prevention mechanism of the present invention includes: a housing, an input shaft, an output shaft, an overtaking prevention passive disk, a force transmission pin, and a spring seat pin, wherein the overtaking prevention passive disk is fixedly connected to the output shaft; characterized in that: it further includes an overtaking prevention drive cam, a transmission pawl, and a force cam; the overtaking prevention drive cam is fixedly mounted on the input shaft, and the outer edge of the overtaking prevention drive cam is provided with a number of active toothed flanges corresponding to the number of transmission pawls, and the outer edge of the overtaking prevention drive cam is also provided with a number of blocking flanges corresponding to the number of force cams.

[0012] The overtaking prevention mechanism is characterized in that: in the rotation direction obtained by the output shaft under gravity drive, an overtaking prevention driving cam, at least one transmission pawl, and at least one force cam are provided to form an overtaking prevention mechanism; according to the needs of mechanical performance and mechanical conditions, a number of transmission pawls and a number of force cams can be evenly distributed and hinged around the circumference of the overtaking prevention passive disk.

[0013] The overtaking prevention mechanism is characterized in that: the transmission pawl is hinged to the overtaking prevention passive disk via a pawl pin, the transmission pawl is provided with a passive toothed flange and a force-transmitting pawl flange, the passive toothed flange of the transmission pawl meshes with the active toothed flange of the overtaking prevention drive cam; the force cam is hinged to the overtaking prevention passive disk via a force-transmitting pin, the force cam is provided with a moving flange and a force-transmitting flange, the moving flange contacts the force-transmitting pawl flange, and the force-transmitting flange contacts the blocking flange.

[0014] The overtaking prevention mechanism is characterized in that it further includes push springs in a number corresponding to the number of force cams, fixed spring seats in a number corresponding to the number of force cams, and movable spring seats in a number corresponding to the number of force cams. The fixed spring seats are hinged to the overtaking prevention passive disk via spring seat pins, the movable spring seats are hinged to the force cams, and the push springs are installed between the movable spring seats and the fixed spring seats.

[0015] The gravity self-braking device of the present invention includes: a braking device housing, a braking device input shaft, a braking device output shaft, a braking device passive disc, an intermediate mounting disc, a rear mounting disc, a mounting pin, and a series-mounted pin. Its characteristic feature is that it further includes an inner grooved wheel friction pawl mechanism and an anti-overrunning mechanism.

[0016] The gravity self-braking device is characterized in that: according to the requirements of mechanical performance and mechanical conditions, a plurality of the brake device transmission cams and a plurality of the anti-overrun drive cams can be fixedly installed on the input shaft of the brake device along the axial direction; a plurality of the inner annular friction groove wheels are also fixedly installed on the housing of the brake device accordingly; a plurality of intermediate mounting plates and a rear mounting plate are correspondingly provided, and are fixedly connected to the driven plate of the brake device through the mounting pins and the serially mounted pins; the force cam and the transmission pawl are installed between the intermediate mounting plate and the rear mounting plate; and the built-in friction pawl is installed between the intermediate mounting plate and the driven plate of the brake device.

[0017] The substantive features and significant effects of the invention:

[0018] The internal grooved wheel friction pawl mechanism and the anti-overrunning mechanism provided by this invention are general-purpose basic components for mechanical transmission. Their essential features are:

[0019] 1. The inner grooved wheel friction pawl mechanism comprises three main core components: an inner annular friction grooved wheel, a built-in friction pawl, and a transmission cam. The inner grooved wheel friction pawl mechanism provided by this invention breaks through the traditional design concept that friction pawl mechanisms cannot incorporate an inner annular friction grooved wheel and that the friction pawl cannot be built-in. This allows the friction pawl mechanism and gravity self-braking device to enter a continuous power transmission system.

[0020] 2. The overtaking prevention mechanism comprises three main core components: an overtaking prevention drive cam, a transmission pawl, and a force cam. The overtaking prevention mechanism provided by this invention effectively solves the technical problem of preventing the driven wheel from overtaking the driving wheel in an intermittent drive mechanism when there is a movement gap between the driving and driven wheels.

[0021] 3. The gravity self-braking device designed based on the internal grooved wheel friction pawl mechanism and the anti-overrunning mechanism can be widely used in the field of mechanical engineering technology. The embodiments of the present invention include a general gravity self-braking device equipped with a common electric motor and a general vehicle anti-rollover device equipped with a common heavy-duty truck.

[0022] The significant advantage of this invention is that the gravity self-braking mechanism provides a novel mechanical transmission component for the general field of mechanical engineering, offering more design options for mechanical transmission design. As a brake for lifting machinery, the gravity self-braking mechanism reduces energy consumption, decreases wear on components, and improves equipment reliability by relying on gravity for braking. The use of a gravity self-braking mechanism in automobile anti-rollover devices reduces component weight and improves reliability, which is of practical significance for improving driver working conditions, ensuring the smooth and safe operation of the vehicle's transmission system, and reducing traffic accidents. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the inner grooved wheel friction ratchet mechanism of the present invention;

[0024] Figure 2 for Figure 1 Sectional view of AA;

[0025] Figure 3 This is a cross-sectional view of the overrun prevention mechanism of the present invention;

[0026] Figure 4 for Figure 3 BB section view;

[0027] Figure 5 , Figure 6 , Figure 7A diagram illustrating the working principle of an internal grooved wheel friction pawl mechanism;

[0028] Figure 8 , Figure 9 , Figure 10 Diagram illustrating the working principle of the overrun prevention mechanism;

[0029] Figure 11 This is a cross-sectional view of a gravity-based self-braking device.

[0030] Figure 12 for Figure 11 CC section view;

[0031] Figure 13 for Figure 11 DD section view;

[0032] Figure 14 A cross-sectional view of a gravity self-braking device equipped with a 5.5kW ordinary motor, as an embodiment of the present invention;

[0033] Figure 15 A cross-sectional view of a vehicle anti-rollover device equipped on a common heavy-duty truck, as an embodiment of the present invention;

[0034] Figure 16 for Figure 15 EE section view;

[0035] Figure 17 for Figure 15 FF section view;

[0036] Attached Figure Labeling Explanation

[0037] 1-Input shaft 2-Output shaft 3-Casing 4-Passive disk

[0038] 5-Transmission Cam 501-Right-hand Drive Flange 502-Left-hand Drive Flange

[0039] 6-Inner annular friction groove wheel; 7-Built-in friction pawl; 701-Right-handed flange

[0040] 702-Left-hand flange 8-Force transmission pin 9-Stop block 10-Return spring

[0041] 11-Overrun protection drive cam; 1101-Suppression flange; 1102-Active toothed flange

[0042] 12-Spring seat pin; 13-Drive pawl; 1301-Passive toothed flange

[0043] 1302 - Force transmission pawl flange; 14 - Force-acting cam; 1401 - Actuating flange

[0044] 1402-Force transmission flange 16-Push spring 15-Moving spring seat

[0045] 17-Fixed spring seat; 18-Paw pin; 19-Overrun protection passive disc.

[0046] 20 - String pin shaft; 21 - Brake device input shaft; 22 - Brake device output shaft

[0047] 23-Brake device housing 24-Brake device driven disc

[0048] 25-Brake device transmission cam 2501-Brake device right-hand drive flange

[0049] 2502 - Braking device left-hand drive flange 26 - Mounting pin

[0050] 27-Intermediate mounting plate 28-Rear mounting plate 29-Motor

[0051] 2901 - Motor output shaft 30 - Automotive connecting flange Detailed Implementation

[0052] The gravity self-braking device described in this invention includes both brake and coupling functions. This invention improves upon the basic concept of a "friction pawl mechanism and self-locking angle" by modifying the specific structure. Traditionally, the "friction pawl mechanism and self-locking angle" theory is generally used in intermittent drive mechanisms, not designed with an inner annular friction groove wheel and a built-in friction pawl, and is generally not used to transmit continuous rotary motion.

[0053] The first key feature of this invention is that the transmission cam and the built-in friction pawl transmit torque and continuous rotational motion. At the initial moment when the input shaft begins its rotational motion, the transmission cam first causes the built-in friction pawl to deflect at an angle in the direction of rotation caused by gravity, while the output shaft remains intermittently paused. The purpose of this design is to disengage the built-in friction pawl from the working surface of the inner annular friction groove wheel before continuous rotational motion begins. Only in this way can friction and wear on the working surface be avoided during continuous rotational motion. The built-in friction pawl only begins to transmit torque and rotational motion to the driven disc and output shaft when the transmission cam causes the built-in friction pawl to deflect to contact the stop block set on the driven disc.

[0054] Because the drive cam has both right-hand and left-hand drive flanges, and the built-in friction pawl also has both right-hand and left-hand flanges, and due to the set rotation direction and special arrangement, regardless of whether the drive cam rotates in the direction of rotation caused by gravity or in the opposite direction, the built-in friction pawl always deflects in the direction of rotation caused by gravity. Thus, regardless of the direction the input shaft rotates, at the instant before continuous rotation, driven by the drive cam, the working surface of the built-in friction pawl always deflects in the same direction (i.e., the direction of rotation caused by gravity), disengaging from the working surface of the inner friction wheel. In the subsequent continuous rotation, the problem with the gravity-driven self-braking mechanism is that because the deflection of the built-in friction pawl needs to be controlled at the instant before continuous rotation, the output shaft needs to be in an intermittent pause at this moment. Therefore, the design needs to retain a certain rotational drive clearance. This rotational drive clearance causes the output shaft and driven wheel to tend to overtake the input shaft and driving wheel under the influence of gravity in the direction of rotation caused by gravity. This is a problem that must be solved.

[0055] Therefore, the second main feature of the present invention is that an overrunning mechanism consisting of an overrunning drive cam, a transmission pawl, and a force cam is provided in the rotational direction obtained by the output shaft under gravity drive.

[0056] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0057] like Figure 1 As shown, the housing 3 is grounded and fixed, and all its transmission components are installed inside the housing 3. The input shaft 1 and output shaft 2 are respectively installed at both ends of the housing 3, and the input shaft 1 and output shaft 2 are installed coaxially. The inner annular friction groove wheel 6 is fixedly connected to the housing 3, and the built-in friction pawl 7 is hinged to the driven disc 4 through the pin 8. The transmission cam 5 is fixedly connected to the input shaft 1.

[0058] like Figure 5 As shown, the direction indicated by the arrow represents the direction of the gravitational force. Figure 5 The mechanism shown is in a stationary state, and the transmission cam 5, which is fixedly connected to the input shaft 1, is in an unconstrained free state, exerting no constraint on the built-in friction pawl 7. Therefore, under the action of gravity, the driven disk 4 drives the built-in friction pawl 7 towards the input shaft 8 via the pin 8. Figure 5 The direction indicated by the arrow has deflected. Figure 5The indicated angle β is the installation angle of the built-in friction pawl 7 relative to the inner annular friction groove wheel 6. Angle β is the self-locking angle calculated based on the self-locking angle principle of theoretical mechanics for the specific structure of this invention. Since the actual installation angle of the built-in friction pawl 7 relative to the inner annular friction groove wheel 6 is less than or equal to the theoretical self-locking angle β, in this state, the torque exerted by gravity on the driven disc 4 is always less than the torque exerted by the friction force between the working surface of the inner annular friction groove wheel 6 and the working surface of the built-in friction pawl 7 on the driven disc 4. Therefore, the driven disc 4 is braked. Gravity acts on the driven disc 4, causing it to experience a rotational torque on one hand, and on the other hand, through the built-in friction pawl 7, causing the driven disc 4 to always experience a slightly larger braking torque. This is the mechanical theoretical basis of the gravity self-braking mechanism. Therefore, the design goal of the gravity self-braking mechanism of this invention is achieved.

[0059] like Figure 6 As shown, the transmission cam 5 rotates in the direction indicated by the arrow, opposite to the direction of gravity. At the initial moment when the input shaft starts rotating, the driven disk 4 and the output shaft remain in a state of gravity-induced self-braking. The right-hand drive flange 501 of the transmission cam 5 contacts the right-hand flange 701 of the built-in friction pawl 7, and the transmission cam 5 pushes the built-in friction pawl 7 to rotate in the direction indicated by the arrow. At this time, the working surface of the built-in friction pawl 7 begins to separate from the working surface of the inner annular friction groove wheel 6. When the built-in friction pawl 7 rotates to contact the stop block 9, the rotation of the built-in friction pawl 7 stops, and the transmission cam 5 begins to drive the driven disk 4 and the output shaft to produce continuous rotational motion. Since the working surface of the built-in friction pawl 7 is in a separated state from the working surface of the inner annular friction groove wheel 6 at this time, no impact, friction, or wear will occur between the rotating parts during this continuous rotational motion. When the motion input by input shaft 1 and transmission cam 5 is terminated, input shaft 1 and transmission cam 5 immediately enter an unconstrained free state, and under the action of return spring 10, the structure returns to its original state. Figure 5 As shown, the mechanism brakes itself under the influence of gravity.

[0060] like Figure 7As shown, the transmission cam 5 rotates in the direction indicated by the arrow, which is the same as the direction of gravity. At the initial moment when the input shaft starts rotating, the driven disk 4 and the output shaft remain in a state of gravity-induced self-braking. The left-hand drive flange 502 of the transmission cam 5 contacts the left-hand flange 702 of the built-in friction pawl 7, and the transmission cam 5 pushes the built-in friction pawl 7 to rotate in the direction indicated by the arrow. At this time, the working surface of the built-in friction pawl 7 begins to separate from the working surface of the inner annular friction groove wheel 6, and the self-generated power suddenly disappears. Under conditions of high gravity, it cannot work normally without the action of an anti-overrunning mechanism. Only under conditions of very low gravity will the drive of the motor not be greatly affected. When continuing to work under conditions of very low gravity, the rotation of the built-in friction pawl 7 stops when it rotates to contact the stop block 9. Since the working surface of the built-in friction pawl 7 has separated from the working surface of the inner annular friction groove wheel 6, the self-generated power between the working surfaces of the built-in friction pawl 7 and the inner annular friction groove wheel 6 also disappears. When the drive motor is disconnected or the clutch of the internal combustion engine drive unit is disengaged, and the motion input by the input shaft 1 and the transmission cam 5 is terminated, the input shaft 1 and the transmission cam 5 immediately enter an unconstrained free state. Under the action of the return spring 10, the structure returns to its original state. Figure 5 As shown, the mechanism brakes itself under the influence of gravity.

[0061] Depend on Figure 7 It can be seen that because there are structural gaps between the right-hand drive flange 501 and the left-hand drive flange 502 of the transmission cam 5 and the right-hand flange 701 and the left-hand flange 702 of the built-in friction pawl 7, when the rotation direction of the transmission cam 5 is the same as the direction of gravity, especially under conditions of high gravity, the passive wheel will inevitably overtake the driving wheel. To solve this problem, the present invention provides an anti-overtaking mechanism composed of key functional components such as the anti-overtaking drive cam 11, the transmission pawl 13, and the force cam 14.

[0062] like Figure 4 As shown, the overrun protection drive cam 11 is fixedly connected to the input shaft 1. The transmission pawl 13 is hinged to the overrun protection passive disk 19 via the pawl pin 18. The force cam 14 is hinged to the overrun protection passive disk 19 via the pin 8. The fixed spring seat 17 is hinged to the overrun protection passive disk 19. The movable spring seat 15 is hinged to the force cam 14. The push spring 16 is installed between the movable spring seat 15 and the fixed spring seat 17. Figure 4 The mechanism shown is also in a stationary state, and the anti-overrun drive cam 11, which is fixedly connected to the input shaft 1, is also in an unconstrained free state. The anti-overrun drive cam 11 is as follows... Figure 4 , Figure 9 As shown, in the state of being by Figure 4Evolved to Figure 9 During the process shown in the figure, Figure 4 , Figure 8 , Figure 9 This evolutionary process is broken down into three characteristic points for easier and clearer description.

[0063] like Figure 4 As shown, the anti-overrun drive cam 11 begins to rotate in the direction indicated by the arrow, by... Figure 4 As shown, the active toothed flange 1102 of the anti-overrun drive cam 11 meshes with the passive toothed flange 1301 of the transmission pawl 13. Therefore, the transmission pawl 13 rotates by a corresponding angle according to its transmission ratio with the anti-overrun drive cam 11. The actuating flange 1401 of the force cam 14 and the force-transmitting flange 1302 of the transmission pawl 13 have a transmission relationship. Therefore, the force-transmitting flange 1302 drives the actuating flange 1401, causing the force cam 14 to rotate. Simultaneously, the force-transmitting flange 1402 of the force cam 14 remains in contact with the resisting flange 1101 during its movement. By observing this characteristic point, it can be seen that... Figure 4 , Figure 8 , Figure 9 middle, Figure 8 This reflects the state of the anti-overrun drive cam 11 when it rotates to the midpoint position in the direction shown by the arrow. Figure 9 This reflects the state when the transmission cam 5 and the anti-overtaking drive cam 11 rotate to their final positions in the direction indicated by the arrow. During this process, the force transmission flange 1402 and the blocking flange 1201 remain in contact with each other, and the force transmission flange 1402 moves along the designed specific curve of the blocking flange 1201. It is evident that the specific curve of the blocking flange 1201 completely prevents the overtaking passive disk 19 from overtaking relative to the anti-overtaking drive cam 11. This is the working principle of the anti-overtaking mechanism of the present invention, achieving the objective of the present invention.

[0064] Figure 10 The arrow indicates the direction of rotation of the anti-overrun drive cam, which is the same as... Figure 4 , Figure 8 , Figure 9 The arrows indicate that the anti-overrun drive cam rotates in the opposite direction, which is the state in which the mechanism does work against gravity. Figure 10 It can be seen that when rotating in this direction, the rotation direction of the transmission cam 5 and the anti-overrun drive cam 11 is opposite to the direction of the force of gravity. Under these circumstances, the driven wheel will not overtake the driving wheel in the crane mechanism. When the input shaft 1 and the anti-overrun drive cam 11 rotate in the opposite direction to the force of gravity, Figure 10This represents the actual state of the transmission pawl 13 and the force cam 14. When the motion input by the input shaft 1 and the anti-overrun drive cam 11 is terminated, as mentioned earlier, the structure returns to its original state under the action of the return spring 10. Figure 4 As shown, the mechanism brakes itself under the influence of gravity.

[0065] The aforementioned inner grooved wheel friction pawl mechanism and anti-overrunning mechanism are two basic mechanical transmission components of this invention. A gravity self-braking device is designed using these two basic components, such as... Figure 11 As shown.

[0066] The gravity-driven self-braking device includes a brake housing 23 grounded in place. The brake input shaft 21 and output shaft 22 are coaxially mounted within the brake housing 23. The brake drive cam 25 and anti-overrun drive cam 11 are both fixedly mounted to the brake input shaft 21. The brake drive cam 25 also has a right-hand drive flange 2501 and a left-hand drive flange 2502. The brake driven disc 24 is fixedly mounted to the brake output shaft 22 via a spline connection. The intermediate mounting disc 27 and rear mounting disc 28 are fixedly connected to the brake driven disc 24 via mounting pins 26 and series pins 20, forming a cage-like structure. The assembly relationship between the intermediate mounting disc 27, rear mounting disc 28, and the brake input shaft 21 is an interference fit relative rotational relationship. An internal friction pawl 7 and the brake drive cam 25 are arranged between the brake driven disc 24 and the intermediate mounting disc 27. The force cam 14, the transmission pawl 13, and the anti-overrun drive cam 11 are arranged between the intermediate mounting plate 27 and the rear mounting plate 28.

[0067] like Figure 12 As shown, the designed internal grooved wheel friction pawl mechanism has six built-in friction pawls 7, and its braking device transmission cam 25 is correspondingly designed with six sets of braking device right-hand drive flanges 2501 and braking device left-hand drive flanges 2502. Figure 13 As shown, the designed overtaking prevention mechanism is equipped with three sets of force cams 14 and transmission pawls 13. The overtaking prevention drive cam 11 is correspondingly designed with three sets of blocking flanges 1101 and active toothed flanges 1102.

[0068] The gravity-driven self-braking device of the present invention is suitable as a standard configuration for ordinary electric motors. The first embodiment of the present invention is as follows: Figure 14 The illustrated motor output terminal gravity self-brake, or gravity self-brake motor, is shown. The motor in this embodiment has a power of 5.5kW, a speed of 1450rpm, a total length of 625mm, and a diameter of 300mm. Structurally, a suitable modification has been made to replace the brake device input shaft 21 with the motor output shaft 2901.

[0069] The second embodiment of the present invention is as follows: Figure 15 , Figure 16 , Figure 17 The embodiment shows a vehicle anti-rollover device equipped on a common heavy-duty truck. The truck used in this embodiment is a 40-ton tractor with a transmission torque of 30,000 N·m, a total length of 658 mm, and a diameter of 356 mm. Due to the constraints of its dimensions and transmission torque, this embodiment employs 12 built-in friction pawls 7 to ensure a large braking torque, and three sets of brake drive cams are arranged on the shaft axis. Since the vehicle encounters uphill and downhill conditions when moving forward or backward, anti-overtaking mechanisms are provided in both rotational directions of the drive shaft. To avoid affecting the vehicle's original characteristics, the anti-rollover device in this embodiment also includes a centrifugal force speed-controlled sliding mechanism in the forward movement direction to ensure the vehicle's inherent neutral roll-off function. To ensure the vehicle can be towed normally by rescue equipment, the anti-rollover device also has a small openable window, which can be easily operated manually to completely suppress the mechanism's self-braking function. The vehicle connecting flanges 30 are all connected to the drive shaft connecting flanges of the matching heavy-duty truck.

Claims

1. A gravity-based self-braking device, comprising: The braking device housing (23), braking device input shaft (21), braking device output shaft (22), braking device driven disc (24), intermediate mounting disc (27), rear mounting disc (28), mounting pin (26), and string pin (20) are characterized by: including an inner grooved wheel friction pawl mechanism, the inner grooved wheel friction pawl mechanism including: housing (3), input shaft (1), output shaft (2), driven disc (4), and force transmission pin (8), the driven disc (4) being fixedly connected to the output shaft (2); and also including a built-in friction pawl (7), an inner annular friction grooved wheel (6), and a transmission cam (5); the friction working surface of the built-in friction pawl (7) is an outer trapezoidal cross section, the inner annular friction grooved wheel (6) is fixedly mounted on the housing (3), the friction working surface of the inner annular friction grooved wheel (6) is an inner trapezoidal cross section ring, the built-in friction pawl (7) is a drive cam (5); the friction working surface of the built-in friction pawl (7) is an outer trapezoidal cross section, the friction working surface of the inner annular friction grooved wheel (6) is an inner trapezoidal cross section ring, the friction working surface of the inner annular friction grooved wheel (6) is an inner trapezoidal cross section ring, the friction working surface of the inner annular friction grooved wheel (6) is an inner trapezoidal cross section ring, the friction working surface of the inner annular friction pawl (7 ... grooved wheel (7) is an inner trapezoidal cross section ring, the friction The friction working surface of the pawl (7) is in contact with the friction working surface of the inner annular friction groove wheel (6); it also includes an overrunning mechanism, which includes: a housing (3), an input shaft (1), an output shaft (2), an overrunning passive disk (19), a force transmission pin (8), and a spring seat pin (12). The overrunning passive disk (19) is fixedly connected to the output shaft (2); it also includes an overrunning drive cam (11), a transmission pawl (13), and a force cam (14). The overrunning drive cam (11) is fixedly installed on the input shaft (1). The outer edge of the overrunning drive cam (11) is provided with an active toothed flange (1102) in a number corresponding to the number of the transmission pawl (13). The outer edge of the overrunning drive cam (11) is also provided with a resisting flange (1101) in a number corresponding to the number of the force cam (14).

2. The gravity self-braking device according to claim 1, characterized in that: According to the requirements of mechanical performance and mechanical conditions, a number of brake device transmission cams (25) and a number of anti-overrun drive cams (11) are fixedly installed on the input shaft (21) of the brake device along the axial direction. A number of inner annular friction groove wheels (6) are also fixedly installed on the housing (23) of the brake device. A number of intermediate mounting plates (27) and rear mounting plates (28) are correspondingly provided and are fixedly connected to the driven plate (24) of the brake device through the mounting pin (26) and the serial pin (20). The force cam (14) and the transmission pawl (13) are installed between the intermediate mounting plate (27) and the rear mounting plate (28). The built-in friction pawl (7) is installed between the intermediate mounting plate (27) and the driven plate (24) of the brake device.

3. The gravity self-braking device according to claim 1, characterized in that: The built-in friction pawl (7) is also provided with a right-hand flange (701) and a left-hand flange (702); at least one of the built-in friction pawls (7) is hinged to the driven disk (4) through the force transmission pin (8), and several of the built-in friction pawls (7) are hinged to the driven disk (4) in a circumferentially evenly distributed manner according to the mechanical performance and mechanical conditions required.

4. The gravity self-braking device according to claim 3, characterized in that: The transmission cam (5) is fixedly mounted on the input shaft (1). The transmission cam (5) is provided with a left-hand drive flange (502) and a right-hand drive flange (501) corresponding to the number of built-in friction pawls (7). The left-hand drive flange (502) and the right-hand drive flange (501) of the transmission cam (5) are in contact with the left-hand flange (702) and the right-hand flange (701) of the built-in friction pawls (7), respectively.

5. The gravity self-braking device according to claim 1, characterized in that: It also includes a stop block (9) and a return spring (10). The number of the stop blocks (9) and the return spring (10) corresponds to the number of the built-in friction pawls (7). The stop block (9) is fixedly connected to the passive disk (4). The return spring (10) is installed in the mounting hole of the stop block (9). One end of the return spring (10) is in contact with the built-in friction pawl (7).

6. The gravity self-braking device according to claim 1, characterized in that: In the rotational direction obtained by the output shaft (2) under gravity drive, an overtaking mechanism is provided, consisting of the overtaking drive cam (11), at least one transmission pawl (13), and at least one force cam (14); according to the mechanical performance and mechanical conditions required, several transmission pawls (13) and several force cams (14) are evenly distributed and hinged around the circumference of the overtaking passive disk (19).

7. The gravity self-braking device according to claim 1, characterized in that: The transmission pawl (13) is hinged to the anti-overtaking passive disk (19) via the pawl pin (18). The transmission pawl (13) is provided with a passive toothed flange (1301) and a force transmission pawl flange (1302). The passive toothed flange (1301) of the transmission pawl (13) meshes with the active toothed flange (1102) of the anti-overtaking drive cam (11). The force cam (14) is hinged to the anti-overtaking passive disk (19) via the force transmission pin (8). The force cam (14) is provided with a moving flange (1401) and a force transmission flange (1402). The moving flange (1401) contacts the force transmission pawl flange (1302), and the force transmission flange (1402) contacts the blocking flange (1101).

8. The gravity self-braking device according to claim 1, characterized in that: It also includes push springs (16) in number corresponding to the number of force cams (14), fixed spring seats (17) in number corresponding to the number of force cams (14), and moving spring seats (15) in number corresponding to the number of force cams (14). The fixed spring seats (17) are hinged to the anti-overrun passive disk (19) through the spring seat pin (12). The moving spring seats (15) are hinged to the force cams (14). The push springs (16) are installed between the moving spring seats (15) and the fixed spring seats (17).

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