One-way check transmission mechanism, electric brake and use method

Abstract

The present invention provides a one-way check transmission mechanism, which can drive the output shaft to rotate smoothly in the positive direction when the input shaft rotates in a certain direction, can drive the output shaft to rotate smoothly in the reverse direction when the input shaft rotates in the opposite direction, and cannot rotate in the reverse direction under the action of external force when the input shaft does not rotate. It includes a housing, an input shaft, an output shaft, and a one-way clutch; a pressure plate that matches the output shaft in a spiral line is arranged on the output shaft, and the pressure plate is connected to the input shaft that drives the pressure plate to rotate but does not limit the axial movement of the pressure plate; a force transmission plate is fixed on the output shaft; the one-way clutch includes an outer component fixed on the housing and an inner plate component that can only rotate in one direction relative to the outer component; when the input shaft rotates in a certain direction, the pressure plate moves axially to press the force transmission plate and the inner plate component, so that the pressure plate, the force transmission plate and the inner plate component form a friction transmission structure that can transmit torque, and the output shaft rotates positively under the drive of the input shaft.

Description

Technical Field

[0001] This patent relates to a one-way check transmission mechanism and an electric brake using the one-way check transmission mechanism. Background Art

[0002] With the increasing application of electric vehicles, the electrification of vehicle braking systems has become a trend. Conventional electric brakes are driven by motors. When the braking force needs to be maintained, the motor needs to be continuously powered, which will cause the motor to overheat and consume a lot of power. This disadvantage is particularly prominent in heavy-duty vehicles with large loads, resulting in the use of high-pressure air brake systems on heavy-duty vehicles. The high-pressure air brake system requires the motor to drive the air pump to generate high-pressure air, which then drives the brake system to work. The air pump has low efficiency and a high failure rate. Electric vehicles, especially heavy-duty electric vehicles, are in urgent need of an efficient and reliable electric brake product that can cut off the power or consume less power when maintaining braking and does not overheat the motor.

[0003] The output shaft of the existing one-way transmission mechanism can generally only rotate smoothly in one direction, such as only counterclockwise or clockwise, and cannot achieve two-way smooth rotation. For example, when the unlockable overrunning clutch is unlocked under load, it rotates jerkily, which cannot meet the stability requirements of braking control. The transmission mechanism must achieve both two-way smooth rotation of the output shaft and one-way backstop when the output shaft is not rotating to prevent it from rotating in a certain direction, which has always been difficult to solve. Summary of the invention

[0004] The purpose of this patent is to provide a one-way check transmission mechanism, which can drive the output shaft to rotate smoothly in the forward direction when the input shaft rotates in a certain direction, and can drive the output shaft to rotate smoothly in the reverse direction when the input shaft rotates in the opposite direction. When the input shaft does not rotate, the output shaft cannot rotate in the reverse direction under the action of external force.

[0005] The one-way check transmission mechanism of the present invention comprises a housing, an input shaft, an output shaft, and a one-way clutch; a pressure plate which is matched with the output shaft in a spiral line is arranged on the output shaft, and the pressure plate is connected to the input shaft which drives the pressure plate to rotate but does not restrict the axial movement of the pressure plate; a force transmission plate is fixed on the output shaft; the one-way clutch comprises an outer member fixed on the housing, and an inner plate member which can only rotate in one direction relative to the outer member;

[0006] When the input shaft rotates in a certain direction, the pressure plate moves axially and presses the force transfer plate and the inner plate component, so that the pressure plate, the force transfer plate and the inner plate component form a friction transmission structure that can transmit torque. The torque is transmitted from the input shaft to the output shaft through the pressure plate, the inner plate component and the force transfer plate, and the output shaft rotates forwardly driven by the input shaft; when the output shaft rotates forwardly for a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force to rotate in the reverse direction together with the force transfer plate and the inner plate component, the output shaft cannot rotate in the reverse direction because the inner plate component cannot rotate in the reverse direction relative to the peripheral components; an axial limiting component is fixed on the output shaft or the input shaft; when the input shaft rotates in the opposite direction, driving the pressure plate to move in the reverse axial direction until it contacts the axial limiting component, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate.

[0007] As an improvement to the above-mentioned one-way check transmission mechanism, the inner disc component can move axially relative to the outer disc component; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the inner disc component to press the inner disc component against the force transfer plate, and the torque is transmitted from the input shaft to the output shaft via the pressure plate, the inner disc component and the force transfer plate, and the output shaft rotates forwardly driven by the input shaft; when the input shaft rotates in the opposite direction, driving the pressure plate to move axially away from the inner disc component until it contacts the axial limiting component, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the opposite direction via the pressure plate.

[0008] The above-mentioned one-way check transmission mechanism is provided with a friction ring between the axially opposite end faces of the inner disc member and the pressure plate, or between the axially opposite end faces of the inner disc member and the force transmission plate, and the friction ring is positioned on the inner disc member, the pressure plate or the force transmission plate in the radial direction; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the inner disc member to axially compress the inner disc member, the friction ring and the force transmission plate, and the torque is transmitted from the input shaft to the output shaft via the pressure plate, the friction ring, the inner disc member and the force transmission plate.

[0009] In the above-mentioned one-way check transmission mechanism, the inner disk member of the one-way clutch is rotatably supported on the output shaft.

[0010] In the above-mentioned one-way check transmission mechanism, the one-way clutch is a ratchet pawl clutch.

[0011] In the above-mentioned one-way check transmission mechanism, the one-way clutch is a roller type one-way clutch.

[0012] In the above-mentioned one-way check transmission mechanism, an input disc is fixed on the input shaft, and the input disc is spline-connected with the pressure plate; an axial limiting member is fixed on the end face of the input disc opposite to the end face of the pressure plate.

[0013] In the above-mentioned one-way check transmission mechanism, the friction plate moves axially and is connected to the inner disc component in the circumferential force transmission. When the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate against the force transmission plate. The torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate and force transmission plate. The output shaft and the inner disc component rotate forwardly driven by the input shaft. When the input shaft rotates in the opposite direction, driving the pressure plate to move axially in the reverse direction until it contacts the axial limiting component, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate.

[0014] In the above-mentioned one-way non-return transmission mechanism, the outer periphery of the friction plate is connected to the friction plate sleeve through a spline, and the friction plate sleeve is fixedly connected to the inner disc component.

[0015] In the above-mentioned one-way check transmission mechanism, a thrust plate is fixed on the outer periphery of the force transmission plate; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate against the thrust plate, and the torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate, thrust plate and force transmission plate, and the output shaft and the inner plate component rotate forward in a certain direction driven by the input shaft; when the output shaft rotates forward by a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force to rotate in the opposite direction together with the force transmission plate, thrust plate, friction plate and inner plate component, the output shaft cannot rotate in the reverse direction because the inner plate component cannot rotate in the reverse direction relative to the outer components.

[0016] In the above-mentioned one-way check transmission mechanism, the outer periphery of the friction plate is connected to the friction plate sleeve by a spline, and the friction plate sleeve is fixedly connected to the inner plate component; the outer periphery of the force transmission plate is connected to the friction plate by a spline; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate and the friction plate against the thrust plate, and the torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate, friction plate, thrust plate and force transmission plate, and the output shaft and the inner plate component rotate forward in a certain direction driven by the input shaft; when the output shaft rotates forward by a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force and rotates in the reverse direction opposite to the forward direction together with the force transmission plate, thrust plate, friction plate, friction plate and inner plate component, the output shaft cannot rotate backward because the inner plate component cannot rotate backward relative to the peripheral components.

[0017] The one-way check transmission mechanism has a plurality of friction discs and a plurality of friction plates, which are arranged alternately in the axial direction.

[0018] The one-way non-return transmission mechanism mentioned above, the fixedly connected friction plate sleeve and the inner disc component are rotatably supported on the output shaft or the housing.

[0019] In the above-mentioned one-way check transmission mechanism, an input disc is fixed on the input shaft, and a pressure plate is connected to the input disc via a guide pin so as to be axially movable relative to the input disc; an elastic element is provided between the pressure plate and the input disc for pushing the pressure plate to move axially along the guide pin toward the friction plate.

[0020] This patent also provides an electric brake, which does not require the motor to be powered when the braking state needs to be maintained, reducing energy consumption and preventing the motor from overheating. The electric brake is particularly suitable for battery-powered electric vehicles, especially heavy-load electric vehicles.

[0021] The electric brake includes a motor and a brake system. The brake system includes a brake valve that moves back and forth in a brake cylinder. It also includes the one-way check transmission mechanism. The motor shaft is connected to the input shaft in the one-way check transmission mechanism. The output shaft in the one-way check transmission mechanism is connected to the brake valve through a transmission device to drive the brake valve to move back and forth.

[0022] The method for using the electric brake is as follows: when braking is required, the motor shaft rotates in a certain direction, driving the brake valve to move forward to achieve braking; then the motor loses power and maintains the braking state; when the brake needs to be released, the motor is powered and the motor shaft rotates in the opposite direction, and the brake valve moves backward.

[0023] Beneficial effects of this patent: In this patent, when the input shaft rotates in a certain direction, it drives the output shaft to rotate in the forward direction, and when the input shaft rotates in the opposite direction, it drives the output shaft to rotate in the reverse direction. It can be that the input shaft rotates clockwise to drive the output shaft to rotate in the forward direction, and the input shaft rotates counterclockwise to drive the output shaft to rotate in the reverse direction; it can also be that the input shaft rotates counterclockwise to drive the output shaft to rotate in the forward direction, and the input shaft rotates clockwise to drive the output shaft to rotate in the reverse direction.

[0024] For the convenience of description, we describe the rotation of the input shaft in a certain direction when driving the output shaft to rotate forward as the forward rotation of the input shaft, and the rotation of the input shaft when driving the output shaft to rotate reversely as the reverse rotation of the input shaft.

[0025] The rotation direction of the input shaft when it rotates forward may be the same as the rotation direction of the output shaft when it rotates forward, such as when the input shaft rotates forward is clockwise, the output shaft rotates forward is clockwise; or they may be different, such as when the input shaft rotates forward is clockwise, the output shaft rotates forward is counterclockwise.

[0026] The positive rotation direction of the input shaft must be opposite to the reverse rotation direction of the input shaft. If the positive rotation direction of the input shaft is clockwise, the reverse rotation direction of the input shaft is counterclockwise.

[0027] The positive rotation direction of the output shaft must be opposite to the reverse rotation direction of the output shaft. If the positive rotation direction of the output shaft is clockwise, the reverse rotation direction of the output shaft is counterclockwise.

[0028] The inner disk component can rotate relative to the outer component when the direction of rotation is the same as the positive rotation direction of the output shaft, that is, the inner disk component can rotate positively relative to the outer component, and the inner disk component cannot rotate reversely relative to the outer component; if the positive rotation direction of the output shaft is clockwise, the inner disk component can rotate clockwise relative to the outer component, and the inner disk component cannot rotate counterclockwise relative to the outer component.

[0029] When using this one-way check transmission mechanism, if the output shaft needs to rotate in the forward direction, the input shaft rotates in the forward direction, and the pressure plate moves axially to press the force transmission plate and the inner plate component, so that the pressure plate, the force transmission plate and the inner plate component form a friction transmission structure that can transmit torque. The torque is transmitted from the input shaft to the output shaft through the pressure plate, the inner plate component and the force transmission plate, and the output shaft rotates in the forward direction under the drive of the input shaft; when the output shaft rotates in the forward direction by a certain angle, the input shaft stops rotating. At this time, since the pressure plate, the force transmission plate and the inner plate component form a friction transmission structure that transmits torque, and the inner plate component cannot rotate in the reverse direction relative to the peripheral components, the output shaft cannot rotate in the reverse direction under the action of external force; when the output shaft needs to rotate in the reverse direction, the input shaft rotates in the reverse direction, driving the pressure plate to move axially in the reverse direction, and the pressure plate is out of contact with the force transmission plate and the inner plate component. After the pressure plate moves and contacts with the axial limiting component, the pressure plate cannot continue to move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate.

[0030] In the process of the input shaft rotating forward to transmit torque to the output shaft, the pressure plate moves axially, and the pressure plate, the force transmission plate, and the inner plate components are gradually pressed together to form a friction transmission structure that transmits torque, and the torsion on the output shaft gradually increases, so the output shaft rotates smoothly in the forward direction. In the process of the input shaft rotating reversely to transmit torque to the output shaft, the pressure plate moves axially in the reverse direction, and the pressure plate and the axial limiting component are gradually pressed together, and the torque from the input shaft to the output shaft through the pressure plate gradually increases, and the output shaft rotates smoothly in the reverse direction.

[0031] For example, when using a one-way check transmission mechanism containing an axially movable inner disk component, if the output shaft needs to rotate in the forward direction, the input shaft rotates in the forward direction, and the pressure plate moves axially toward the inner disk component to press the inner disk component against the force transfer plate. Then, the pressure plate and the inner disk component cannot move axially and can only rotate. The torque is transmitted from the input shaft to the output shaft via the pressure plate, the inner disk component and the force transfer plate, and the output shaft and the inner disk component rotate in the forward direction driven by the input shaft. When the output shaft rotates in the forward direction by a certain angle, the input shaft stops rotating. At this time, since the inner disk component cannot rotate in the reverse direction relative to the outer components, the output shaft, the force transfer plate and the inner disk component axially pressed together cannot rotate in the reverse direction under the action of external force. When the output shaft needs to rotate in the reverse direction, the input shaft rotates in the reverse direction, driving the pressure plate to move axially away from the inner disk component until it contacts the axial limiting component. Then, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate, etc.

[0032] A friction ring is arranged between the axially opposite end faces of the inner disc member and the pressure plate, or between the axially opposite end faces of the inner disc member and the force transmission plate. The friction coefficient between the friction ring and the inner disc member and the pressure plate is relatively large, which can improve the reliability of torque transmission between the inner disc member and the force transmission plate.

[0033] For another example, when using a bidirectional check transmission mechanism composed of friction plates, etc., if the output shaft needs to rotate in the forward direction, the input shaft rotates in the forward direction, and the pressure plate moves axially toward the friction plate to press the friction plate against the force transfer plate. Then, the pressure plate and the friction plate cannot move axially and can only rotate. Moreover, the friction plate is connected to the inner plate component in the circumferential direction, so the inner plate component also rotates with the friction plate. The torque is transmitted from the input shaft to the output shaft through the pressure plate, the friction plate and the force transfer plate, and the output shaft rotates in the forward direction driven by the input shaft. After the output shaft rotates in the forward direction for a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force to rotate in the reverse direction together with the force transfer plate, the friction plate and the inner plate component, the output shaft cannot rotate in the reverse direction because the inner plate component cannot rotate in the reverse direction relative to the outer components.

[0034] When the input shaft rotates in the reverse direction, the pressure plate moves axially in the reverse direction and breaks away from the friction plate. After it moves to contact the axial limiting member, the pressure plate cannot move further, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate.

[0035] The elastic element can axially compress the pressure plate, friction plate, transmission plate, etc. to improve the reliability of the transmission.

[0036] The bidirectional non-return transmission mechanism containing an axially movable inner disk component, or a bidirectional non-return transmission mechanism composed of a friction plate, etc., has high transmission efficiency and reliable structure.

[0037] One-way clutch is an existing technology, such as ratchet pawl clutch, roller one-way clutch, etc. The inner disc member of the one-way clutch can move axially relative to the outer member; the inner disc member of the one-way clutch is rotatably supported on the output shaft, and the structure is more simplified.

[0038] The input shaft can drive the pressure plate to rotate, but the pressure plate can move axially. For example, the input shaft can be splined to the pressure plate. Of course, the input plate can also be fixed on the input shaft, and the input plate is splined to the pressure plate; the axial limit member is fixed on the end face of the input plate opposite to the end face of the pressure plate.

[0039] In the electric brake of this patent, the motor is connected to the brake valve in the brake system through a one-way check transmission mechanism, a transmission device, etc. to drive the brake valve to move back and forth. The transmission device belongs to the prior art and will not be described again. Any transmission device that can convert the rotation of the output shaft into the axial movement of the brake valve can be used. The brake cylinder, brake valve, etc. belong to the prior art. The transmission device is generally a speed reduction mechanism. The brake system belongs to the prior art.

[0040] When braking is required, the motor shaft rotates in a certain direction, and the brake valve moves forward to achieve braking; when the braking state needs to be maintained, the motor can be de-energized, which not only does not consume electrical energy, but also does not overheat the motor. At this time, the output shaft cannot rotate in the opposite direction, and the brake valve will not move backward; when the brake needs to be released, the motor shaft rotates in the opposite direction, and the brake valve moves backward. When the output shaft rotates in the opposite direction, if the output shaft has a load reaction force, the pressure plate, under the action of the spiral structure, reduces the clamping force on the force transfer plate and the inner plate components, and the friction force decreases. When it is reduced to less than the force of the load acting on the friction surface, the output shaft rotates under the action of the load. If there is no load reaction force, the clamping force of the pressure plate on the force transfer plate and the inner plate components increases, the friction force increases, and the motor drives the output shaft to reverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of an electric brake of Embodiment 1;

[0042] Figure 2 It is a schematic diagram of a motor, a one-way non-return transmission mechanism, etc.;

[0043] Figure 3 It is a schematic diagram of the connection of the components of the input plate, pressure plate, friction ring, inner plate component, and force transfer plate;

[0044] Figure 4 yes Figure 3 CC profile of ;

[0045] Figure 5 is a schematic diagram of an electric cylinder of Embodiment 2;

[0046] Figure 6 It is a schematic diagram of a motor, a one-way check transmission mechanism, a transmission device, etc.;

[0047] Figure 7 It is a schematic diagram of a one-way check transmission mechanism, etc.;

[0048] Figure 8 It is a three-dimensional diagram of a part of a friction plate 1, a friction plate sleeve 1, a one-way clutch 1, etc.;

[0049] Fig. 9 is another stereoscopic view of a portion of a friction plate 1, a friction plate sleeve 1, a one-way clutch 1, etc.;

[0050] Fig.10 is a three-dimensional diagram of friction disc one;

[0051] Fig.11 It is a three-dimensional diagram of friction plate one.

[0052] In the figure, the motor 100, the motor shaft 101, the rotor 102, the brake cylinder 200, the brake valve 300, the piston rod 1300, the one-way check transmission mechanism 400, the transmission device 500,

[0053] Input shaft 1, output shaft 2, housing 10,

[0054] Input disc 11, pressure plate 12, friction ring 13, inner disc component 14, force transmission disc 15, axial limiting component 16, thrust plate 116, bearing 17, friction disc 18, friction plate 19, guide pin 21, elastic element 22, friction plate sleeve 23, peripheral component 24, roller 25,

[0055] Gear 1 51, gear 2 52, gear 3 53, gear 4 54, transition shaft 55, lead screw 56, nut 57. DETAILED DESCRIPTION

[0056] In the detailed description, the axial direction of the output shaft, viewed from left to right, is used as a reference for determining the counterclockwise or clockwise rotation direction.

[0057] Embodiment 1 (electric brake, one-way check transmission mechanism composed of friction plate, etc.)

[0058] See also Figure 1 The electric brake comprises a motor 100 , a brake valve 300 which reciprocates in a brake cylinder 200 , a one-way check transmission mechanism 400 , and a transmission device 500 .

[0059] The transmission device 500 includes a gear 1 51 fixed on the output shaft 2, a gear 2 52 rotatably arranged on the housing and meshing with the gear 1, a nut 57 threadedly matched with the lead screw 56 is fixed to the gear 2 52, the lead screw can only be moved in the axial direction on the housing, and the front end of the lead screw is connected to the rear end of the brake valve 300.

[0060] The one-way check transmission mechanism 400 includes an input shaft 1, an output shaft 2, a housing 10, an input disc 11, a pressure plate 12, a friction ring 13, an inner disc component 14, a force transmission disc 15, an axial limiting component 16, a bearing 17, a peripheral component 24, etc.

[0061] The roller-type one-way clutch includes an outer member 24, a roller 25, an inner disk member 14, etc., and belongs to the prior art. The outer member 24 is fixed on the housing 10, and the inner disk member 14 can rotate clockwise relative to the outer member 24, but cannot rotate counterclockwise relative to the outer member 24.

[0062] The motor shaft 101 of the motor 100 is the input shaft 1 in the one-way check transmission mechanism 400, and the motor housing is fixed on the housing 10. The output shaft 2 in the one-way check transmission mechanism is connected to the brake valve 300 through the transmission device 500 to drive the brake valve to move back and forth.

[0063] An input disc is fixed on the input shaft 1 , and the input disc is spline-connected with the pressure disc 12 in the circumferential direction; the axial limiting member 16 is the end face of the input disc opposite to the end face of the pressure disc 12 .

[0064] A pressure plate 12 is arranged on the output shaft 2 and matches the output shaft 2 in a right-handed spiral line, and a force transmission plate 15 is fixed on the output shaft 2; the roller-type one-way clutch includes an outer member 24 fixed on the housing, and an inner plate member 14 that can only rotate clockwise relative to the outer member 24; the inner plate member 14 is rotatably supported on the output shaft 2 through a bearing. The inner plate member 14 can move axially relative to the outer member 24.

[0065] Friction rings 13 are arranged between the axially opposite end faces of the inner disc component 14 and the pressure plate 12, and between the axially opposite end faces of the inner disc component 14 and the force transfer plate 15. The friction ring 13 between the inner disc component 14 and the pressure plate 12 is positioned on the pressure plate 12 in the radial direction, and the friction ring 13 between the inner disc component 14 and the force transfer plate 15 is positioned on the force transfer plate 15 in the radial direction.

[0066] The motor shaft rotates clockwise, driving the input shaft 1 and the input disc to rotate clockwise, and the pressure plate 12 moves axially to the right toward the inner disc member 14 to press the friction ring 13 and the inner disc member 14 onto the force transmission disc 15. The torque is transmitted from the input shaft 1 through the pressure plate 12, the friction ring 13 between the inner disc member 14 and the pressure plate 12, the inner disc member 14, the friction ring 13 between the inner disc member 14 and the force transmission disc 15, and the force transmission disc 15 to the output shaft 2. The output shaft 2 rotates forwardly driven by the input shaft 1; through the transmission of gear 1 51 and gear 2 52, the nut 57 is driven to rotate, and the lead screw 56 matched with the nut 57 is axially moved to the right, driving the brake valve to move forward (right) to achieve braking.

[0067] Then the motor loses power and remains in the braking state. At this time, if the output shaft 2 is driven by an external force (such as a brake valve, etc., which acts on the output shaft 2 through a transmission device) to rotate counterclockwise together with the force transfer plate 15, the friction ring 13, and the inner plate component 14, the output shaft 2 cannot rotate counterclockwise because the inner plate component 14 cannot rotate counterclockwise relative to the outer component 24.

[0068] When the brake needs to be released, the motor is energized, the motor shaft rotates counterclockwise, the input shaft 1 and the input disc rotate counterclockwise, driving the pressure plate 12 to move axially to the left away from the inner disc member 14 until it contacts the axial limiting member 16 (the right end face of the input disc). The pressure plate 12 cannot move axially, and the input shaft 1 drives the output shaft 2 to rotate in the opposite direction through the pressure plate 12, driving the brake valve to move backward (left) through the transmission device, and the brake is released.

[0069] An electric brake includes at least a driving motor, a one-way power transmission mechanism (one-way check transmission mechanism) composed of a friction transmission device and a one-way clutch, a deceleration mechanism, and a braking system. A component of the one-way clutch, such as a peripheral component, is fixed to the housing and does not move.

[0070] The motor transmits power to the reduction mechanism through the friction transmission device and the one-way clutch. When the motor is not exerting force, the reaction force (external force) of the braking system acts on the reduction mechanism and is locked by the one-way transmission mechanism, so that the motor does not need to be powered to maintain the braking force. Only when the motor is exerting force will the reduction mechanism apply the force of the motor to the braking system.

[0071] The structure and principle of the friction transmission device are described as follows: it is composed of a pressure plate (with a threaded hole in the inner hole, which matches the output shaft), a friction ring, an inner plate component, and an output shaft. The pressure plate is driven by a motor. When the pressure plate rotates in the tightening direction, the pressure plate presses the friction ring, the inner plate component, and the force transmission plate. At this time, the torque of the motor is transmitted to the output shaft through the pressure plate, the friction ring, the inner plate component, and the force transmission plate, driving the driving gear 1 to rotate, and the driving gear 1 drives the driven gear 2 and the nut to rotate again, driving the lead screw to extend, and driving the brake through the intermediate transmission mechanism (such as hydraulic, mechanical connecting rod, etc.) in the brake system. At this time, the pressure plate, the friction ring and the inner plate component are pressed tightly and cannot rotate with each other. The inner plate component of this embodiment is the rotor of the one-way clutch, and the one-way clutch does not limit the inner plate component from rotating clockwise under the drive of the pressure plate. When the motor is not generating power, the transmission plate, under the reaction of the output shaft, presses the friction ring, the inner plate component, and the pressure plate, so that the pressure plate and the inner plate component cannot rotate, the inner plate component cannot rotate counterclockwise under the action of the one-way clutch, and the driven plate cannot rotate in the direction of releasing the brake, so that the braking force can be maintained. When the motor drives the pressure plate to rotate counterclockwise, the force of the pressure plate pressing the friction ring decreases. When the friction force generated by the pressure is less than the reaction force of the braking force, the friction ring begins to slide and releases the braking force.

[0072] The advantages of this structure are high transmission efficiency: there is no additional power loss when the motor drives the brake, and there is good control linearity (no setbacks) when releasing. Compared with the worm gear reduction mechanism, although both have good control linearity, the worm gear mechanism has low transmission efficiency, while this innovative mechanism has high efficiency. Compared with the mechanism with only a roller-type one-way clutch, the release linearity is good: when releasing the ordinary roller-type one-way clutch, the friction force is very large because the roller is pressed by the inclined surface. Once the roller leaves the inclined surface, the mechanism will be released quickly, which is not easy to control precisely.

[0073] The one-way clutch can be a ratchet pawl clutch or a roller-type one-way clutch with a cylindrical roller and an inclined surface structure, and its specific structure does not affect the protection scope of the claims of this patent;

[0074] The number of friction rings and pressure plates used does not affect the scope of protection of the patent claims;

[0075] The speed reduction mechanism can be a screw transmission mechanism or a gear transmission mechanism, etc. Its specific structure does not affect the protection scope of the claims of this patent;

[0076] The specific structural form of the intermediate transmission mechanism in the braking system does not affect the protection scope of the claims of this patent;

[0077] Adding connecting components, buffer components, etc. to the electric brake does not affect the scope of protection of the claims of this patent.

[0078] Embodiment 2 (electric cylinder, one-way non-return transmission mechanism composed of friction plate, etc.):

[0079] See also Figure 5-11 As shown, the electric cylinder includes a motor 100, a reciprocating piston rod 1300, and a one-way non-return transmission mechanism 400. The output shaft 2 in the one-way non-return transmission mechanism is connected to the piston rod 1300 through a transmission device 500 to drive the piston rod to reciprocate.

[0080] See also Figure 5 , 6 The transmission device 500 includes a gear 1 51 fixed on the output shaft 2, a transition shaft 55 rotatably supported on the housing, a gear 2 52 and a gear 3 53 arranged on the transition shaft 55 and meshing with the gear 1, a gear 4 54 meshing with the gear 3 53, and the gear 4 54 is fixed to a lead screw 56 rotatably supported on the housing. The lead screw 56 cooperates with a nut 57 fixed on the piston rod 1300 through a thread, and the piston rod 1300 is arranged on the housing so as to be movable only in the axial direction.

[0081] See also Figure 7The one-way check transmission mechanism 400 includes an input shaft 1, an output shaft 2, a housing 10, an input disc 11, a pressure plate 12, a friction plate 19, an inner disc component 14, a force transmission disc 15, a thrust plate 116, a bearing 17, a friction disc 18, a guide pin 21, an elastic element 22, a friction plate sleeve 23, and a peripheral component 24.

[0082] See also Figure 7-9 The roller type one-way clutch includes an outer member 24, a roller 25, an inner disk member 14, etc., and belongs to the prior art. The outer member 24 is fixed on the housing 10. The inner disk member 14 cannot rotate clockwise relative to the outer member 24.

[0083] See also Figure 5 , 6 The motor 100 includes a motor shaft 101 fixed on a rotor 102, and both ends of the motor shaft 101 are rotatably arranged on the motor housing, and both ends of the motor housing are fixed on the housing 10. The motor shaft 101 is the input shaft 1 of the one-way check transmission mechanism 400. The output shaft 2 is coaxial with the hollow input shaft 1, and is rotatably supported on the inner disk component (or the one-way rotating sleeve formed by the fixed connection of the friction plate sleeve and the inner disk component) and the housing 10 through a bearing. The one-way rotating sleeve is rotatably supported on the housing 10 through a bearing.

[0084] A pressure plate 12 is arranged on the output shaft and matches the output shaft in a left-handed spiral line. When the input shaft rotates counterclockwise, the pressure plate 12 moves to the right. When the input shaft rotates clockwise, the pressure plate 12 moves to the left. A force transmission plate 15 is fixed on the output shaft.

[0085] An input disc 11 is fixed on the input shaft, a guide pin is fixed on the input disc 11, a pressure plate 12 is axially slidably arranged on the guide pin, and an elastic element is arranged between the pressure plate 12 and the input disc 11 for pushing the pressure plate 12 to move axially along the guide pin toward the friction plate 19.

[0086] There are multiple friction discs 18 and friction plates 19, which are staggered in the axial direction. The outer periphery of the friction plate 19 is connected to the friction plate sleeve 23 through a spline, and the friction plate sleeve 23 is fixedly connected to the inner plate member 14 to form a one-way rotating sleeve. The outer periphery of the force transmission plate 15 is connected to the friction disc 18 through a spline. The thrust plate 116 is fixed on the outer periphery of the force transmission plate 15; the pressure plate 12 and the thrust plate 116 are located on both sides of the friction disc 18 and the friction plate 19 staggered in the axial direction.

[0087] When the input shaft rotates counterclockwise, the pressure plate 12 moves axially to the right to press the friction plate 19 and the friction plate 18 against the thrust plate 116, and the torque is transmitted from the input shaft, the input plate 11, the pressure plate 12, the friction plate 19, the friction plate 18, the thrust plate 116, the force transmission plate 15, etc. to the output shaft, and the output shaft and the inner plate component 14 rotate counterclockwise under the drive of the input shaft; when the output shaft rotates counterclockwise for a certain angle, the input shaft stops rotating. At this time, if the output shaft rotates clockwise together with the force transmission plate 15, the thrust plate 116, the friction plate 18, the friction plate 19, and the inner plate component 14 under the drive of external force, the output shaft cannot rotate clockwise because the inner plate component 14 cannot rotate clockwise relative to the outer member 24. An axial limiting component 16 is set on the output shaft; the axial limiting component 16 is opposite to the pressure plate. The pressure plate is located between the axial limiting component and the force transmission plate. When the input shaft 1 rotates clockwise, the input disc 11 rotates clockwise, and the pressure plate 12 overcomes the elastic force of the elastic element 22 and moves axially to the left away from the friction plate 19. After the pressure plate 12 moves to contact with the axial limiting member, the pressure plate cannot move further, and the input shaft 1 and the input disc 11 drive the output shaft to rotate clockwise through the pressure plate.

[0088] As mentioned above, when the motor shaft rotates counterclockwise, the output shaft rotates counterclockwise, and the lead screw 56 rotates through the transmission of gear 1 51, gear 2 52, gear 3 53, and gear 4 54, and the piston rod 1300 moves leftward through the cooperation with the nut 57; when the motor shaft rotates clockwise, the piston rod 1300 moves rightward. The left and right movement of the piston rod pushes or pulls up the movable arm, so that the movable arm reaches a certain position.

Claims

1. A one-way check transmission mechanism, comprising a housing, an input shaft, an output shaft, and a one-way clutch; wherein: A pressure plate is arranged on the output shaft and is matched with the output shaft in a spiral line. The pressure plate is connected to the input shaft which drives the pressure plate to rotate but does not restrict the axial movement of the pressure plate. A force transmission plate is fixed on the output shaft. The one-way clutch includes an outer member fixed on the housing and an inner plate member which can only rotate in one direction relative to the outer member. When the input shaft rotates in a certain direction, the pressure plate moves axially and presses the force transfer plate and the inner plate component, so that the pressure plate, the force transfer plate and the inner plate component form a friction transmission structure that can transmit torque. The torque is transmitted from the input shaft to the output shaft through the pressure plate, the inner plate component and the force transfer plate, and the output shaft rotates forwardly under the drive of the input shaft; when the output shaft rotates forwardly for a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force to rotate in the reverse direction together with the force transfer plate and the inner plate component, the output shaft cannot rotate in the reverse direction because the inner plate component cannot rotate in the reverse direction relative to the peripheral components; an axial limiting component is fixed on the output shaft or the input shaft; when the input shaft rotates in the opposite direction, driving the pressure plate to move in the reverse axial direction until it contacts the axial limiting component, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate; The inner disc component can move axially relative to the outer component; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the inner disc component to press the inner disc component against the force transfer plate, and the torque is transmitted from the input shaft to the output shaft through the pressure plate, the inner disc component and the force transfer plate, and the output shaft rotates forwardly driven by the input shaft; when the input shaft rotates in the opposite direction, driving the pressure plate to move axially away from the inner disc component until it contacts the axial limiting component, the pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the opposite direction through the pressure plate.

2. The one-way non-return transmission mechanism according to claim 1, characterized in that: A friction ring is arranged between the axially opposite end faces of the inner disc component and the pressure plate, or between the axially opposite end faces of the inner disc component and the force transfer plate, and the friction ring is positioned on the inner disc component, the pressure plate or the force transfer plate in the radial direction; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the inner disc component to axially compress the inner disc component, the friction ring and the force transfer plate, and the torque is transmitted from the input shaft to the output shaft via the pressure plate, the friction ring, the inner disc component and the force transfer plate.

3. The one-way non-return transmission mechanism according to claim 1, characterized in that: The inner disc member of the one-way clutch is rotatably supported on the output shaft.

4. The one-way non-return transmission mechanism according to claim 1, characterized in that: The one-way clutch is a ratchet pawl clutch or a roller one-way clutch.

5. The one-way non-return transmission mechanism according to claim 1, characterized in that: the input shaft The upper fixed input disc is spline-connected with the pressure disc; the axial limiting component is fixed on the end face of the input disc opposite to the end face of the pressure disc.

6. The one-way non-return transmission mechanism according to claim 1, characterized in that: The friction plate moves axially and is connected to the inner plate component in the circumferential force transmission. When the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate against the force transmission plate. The torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate and force transmission plate. The output shaft and the inner plate component rotate forwardly driven by the input shaft. When the input shaft rotates in the opposite direction, the pressure plate is driven to move axially in the reverse direction until it contacts the axial limiting component. The pressure plate cannot move axially, and the input shaft drives the output shaft to rotate in the reverse direction through the pressure plate.

7. The one-way non-return transmission mechanism according to claim 6, characterized in that: The outer periphery of the friction plate is connected to the friction plate sleeve through a spline, and the friction plate sleeve is fixedly connected to the inner disc component.

8. The one-way non-return transmission mechanism according to claim 6, characterized in that: A thrust plate is fixed on the outer periphery of the force transfer plate; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate against the thrust plate, and the torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate, thrust plate and force transfer plate, and the output shaft and the inner plate component rotate forward in a certain direction driven by the input shaft; when the output shaft rotates forward by a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force to rotate in the opposite direction together with the force transfer plate, thrust plate, friction plate and inner plate component, the output shaft cannot rotate in the reverse direction because the inner plate component cannot rotate in the reverse direction relative to the outer components.

9. The one-way non-return transmission mechanism according to claim 8, characterized in that: The outer periphery of the friction plate is connected to the friction plate sleeve by a spline, and the friction plate sleeve is fixedly connected to the inner plate component; the outer periphery of the force transfer plate is connected to the friction plate by a spline; when the input shaft rotates in a certain direction, the pressure plate moves axially toward the friction plate to press the friction plate and the friction plate against the thrust plate, and the torque is transmitted from the input shaft to the output shaft through the pressure plate, friction plate, friction plate, thrust plate, and force transfer plate, and the output shaft and the inner plate component rotate forward in a certain direction driven by the input shaft; when the output shaft rotates forward by a certain angle, the input shaft stops rotating. At this time, if the output shaft is driven by an external force and rotates in the opposite direction together with the force transfer plate, thrust plate, friction plate, friction plate, and inner plate component, the output shaft cannot rotate backward because the inner plate component cannot rotate backward relative to the peripheral components.

10. The one-way non-return transmission mechanism according to claim 9, characterized in that: There are multiple friction discs and multiple friction plates, which are staggered in the axial direction.

11. The one-way non-return transmission mechanism according to claim 9, characterized in that: The fixedly connected friction plate sleeve and inner disc component are rotatably supported on the output shaft or the housing.

12. The one-way non-return transmission mechanism according to claim 6, wherein the input shaft An input disc is fixed on the upper side, and a pressure plate is connected to the input disc via a guide pin so as to be axially movable relative to the input disc; an elastic element is arranged between the pressure plate and the input disc for pushing the pressure plate to move axially along the guide pin toward the friction plate.

13. An electric brake comprising a motor and a brake system, the brake system comprising a brake valve reciprocating in a brake cylinder, characterized in that: It also includes the one-way check transmission mechanism described in any one of claims 1-12, the motor shaft is connected to the input shaft in the one-way check transmission mechanism, and the output shaft in the one-way check transmission mechanism is connected to the brake valve through a transmission device to drive the brake valve to move back and forth.

14. The method for using the electric brake according to claim 13, characterized in that: When braking is required, the motor shaft rotates in a certain direction, driving the brake valve forward to achieve braking; then the motor loses power and maintains the braking state; when braking needs to be released, the motor is energized and the motor shaft rotates in the opposite direction, and the brake valve moves backward.

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