Power take-off electric gear shifting device and system

Abstract

The present application relates to the technical field of power take-off electric gear shifting, in particular to a power take-off electric gear shifting device and system, the present application can control the motor of the power take-off system based on the instruction transmitted by the automatic gearbox of the new energy vehicle, use the vehicle controller to collect the information such as the gear shifting intention of the driver, accurately judge the gear position of the vehicle through corresponding calculation, and realize the automatic gear shifting of the vehicle. The structure can realize self-locking, after the gear shifting is completed, the motor stops outputting torque, the power take-off device keeps the existing position, and the gear position is ensured unchanged. The pain points that most power take-off devices are controlled by air pressure and hydraulic pressure, and only part of the power take-off motor cannot stop rotating and is easy to burn out, and cannot realize self-locking, can be effectively solved, the availability of the whole vehicle electrical control is improved without affecting the gear shifting efficiency, and the development of new energy vehicles towards intelligent direction is realized.

Description

Technical Field

[0001] This invention relates to the field of electric power take-off (PTO) shifting technology, and more particularly to an electric power take-off shifting device and system. Background Technology

[0002] Electric shifting technology for power take-offs (PTOs) is a new type of shifting method that uses electric actuators to replace traditional mechanical actuators, thereby achieving faster, more accurate, and smoother shifting operations. Compared with traditional mechanical shifting methods, electric shifting technology has the advantage of faster shifting speed. The electric actuators can respond and act quickly, thus shortening shifting time and increasing shifting speed.

[0003] The power take-off (PTO) is a crucial component of a car, transmitting power from the engine to the transmission and drive axle to propel the vehicle. In traditional PTO designs, gear shifting is typically done manually or pneumatically, requiring the driver to manually operate a gear lever or button, which is cumbersome and prone to errors. With electric shifting technology, the driver simply sends a shift command through the electronic control system to achieve automatic gear changes, making operation simpler and more accurate.

[0004] To address the drawbacks of existing electric shift devices and systems for power take-offs (PTOs) that rely on pneumatic or hydraulic control and cannot achieve self-locking, an electric shift device and system for PTOs has been developed to improve the usability of the vehicle's electrical control without compromising the efficiency of PTO electrification. Summary of the Invention

[0005] The purpose of this invention is to provide an electric shifting device and system for a power take-off (PTO) to solve the problem that most PTOs are controlled by pneumatic or hydraulic pressure and cannot achieve self-locking.

[0006] This invention provides a power take-off (PTO) electric shifting device and system, comprising: a motor control unit, a drive shaft unit, and a motor, wherein the drive shaft unit establishes a communication connection with the motor control unit and the motor;

[0007] The motor control unit is used to organize, filter, and transmit shift data to the drive shaft unit for shift control and drive control.

[0008] The drive shaft unit includes a coupling and a power take-off (PTO) electric shifting device. The PTO electric shifting device is connected to the motor via the coupling. The drive shaft unit is used to transmit the transmission torque from the motor to the PTO, outputting it to the PTO electric shifting device for shifting and power taking, and performing self-locking. After shifting, the motor stops outputting torque, and the PTO maintains its current position to ensure that the gear remains unchanged.

[0009] The electric shifting device for the power take-off is applied to the electric shifting system for the power take-off. The electric shifting device for the power take-off includes a trapezoidal lead screw pair, a sliding pair, a first sleeve, a compression spring, a shift fork, a second sleeve, a gear, and a second shaft.

[0010] The trapezoidal lead screw pair, the sliding pair, the first sleeve, the compression spring, the shift fork, the second sleeve, and the second shaft are installed inside the main body of the power take-off electric shifting device;

[0011] The trapezoidal lead screw is connected to the torque transmission sliding joint, the torque transmission sliding joint is connected to the shift fork, the shift fork is connected to the first sleeve, and the first sleeve is connected to the second shaft through a gear.

[0012] Furthermore, the power take-off electric shifting device also includes: the compression spring, the second sleeve, the gear, and the second shaft;

[0013] After being subjected to the force transmitted by the trapezoidal lead screw, the sliding joint pushes the first sleeve to move to the right, which in turn pushes the shift fork to move to the right. The shift fork is connected to the second sleeve, and the shift fork then pushes the second sleeve to move to the right. The second sleeve is connected to the gear, and the second shaft is connected to the gear. The torque transmitted from the second shaft is transmitted to the gear through the second sleeve for power take-off.

[0014] Furthermore, the power take-off electric shifting device includes: a motor shaft installed between the motor and the coupling; the motor outputs a corresponding torque and transmits the torque through the motor shaft; the motor shaft and the coupling are connected by a flat key; the torque transmitted from the motor shaft is transmitted to the coupling; the coupling is also connected to a trapezoidal lead screw pair; the coupling transmits torque to the trapezoidal lead screw pair; after receiving the torque, the trapezoidal lead screw pair converts the torque into the translation of a sliding pair.

[0015] Furthermore, the motor control unit includes a controller that sends a stop torque output command to the motor. After the motor executes the stop torque output command, the motor stops working, the motor shaft stops rotating, and the trapezoidal lead screw remains in its current position to ensure that the gear position remains unchanged.

[0016] Furthermore, the motor control unit includes a controller that sends a reverse motion command to the motor. Upon receiving the reverse motion command from the controller, the motor begins to move in the reverse direction. The motor outputs a reverse torque and transmits the torque to the trapezoidal lead screw pair. The trapezoidal lead screw pair converts the torque into a leftward translation of the sliding joint. The first sleeve is pushed to the left by the compression spring, which in turn pushes the shift fork to move to the left and disengage from the gear.

[0017] The beneficial effects of this invention are as follows: This invention provides a power take-off (PTO) electric shifting device and system. Based on commands transmitted from the automatic transmission of a new energy vehicle, this invention controls the motor of the PTO system. It utilizes the vehicle controller to collect information such as the driver's shifting intentions and performs corresponding calculations to accurately determine the appropriate gear, thus achieving automatic gear shifting. This structure can achieve self-locking; after shifting, the motor stops outputting torque, and the PTO maintains its current position, ensuring the gear remains unchanged. This effectively solves the pain points of most PTOs, which are controlled by pneumatic or hydraulic pressure, and currently only partially driven by electric motors, where the motor cannot stop rotating, is prone to burnout, and cannot achieve self-locking. Without affecting shifting efficiency, it improves the availability of the vehicle's electrical control, enabling new energy vehicles to develop towards intelligence. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a power take-off electric shifting device and system provided in an embodiment of the present invention.

[0020] Figure 2 This is a structural schematic diagram of a power take-off electric shifting device and system under an exploded state, as provided in an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional structural schematic diagram of a power take-off electric shifting device and system provided in an embodiment of the present invention.

[0022] Figure 4 This is a simplified flowchart illustrating a power take-off (PTO) electric shifting device and system provided in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the system operation of a power take-off electric shifting device and system provided in an embodiment of the present invention. Attached image description:

[0025] 1. Motor, 2. Motor shaft, 3. Coupling, 4. Trapezoidal lead screw pair, 5. Sliding pair, 6. First sleeve, 7. Compression spring, 8. Shift fork, 9. Second sleeve, 10. Gear, 11. Second shaft. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions provided by various embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0027] Please see Figure 1 as well as Figure 5 The present invention provides a power take-off electric shifting device and system, including a motor control unit, a transmission shaft unit and a motor 1, wherein the transmission shaft unit establishes a communication connection with the motor control unit and the motor;

[0028] The motor control unit is used to organize, filter, and transmit shift data to the drive shaft unit for shift control and drive control.

[0029] The transmission shaft unit includes a coupling 3 and a power take-off (PTO) electric shifting device. The PTO electric shifting device is connected to the motor 1 through the coupling 3. The transmission shaft unit is used to transmit the transmission torque from the motor 1 to the PTO, output to the PTO electric shifting device for shifting and power taking, and perform self-locking. After the shift is completed, the motor stops outputting torque, and the PTO maintains its current position to ensure that the gear remains unchanged.

[0030] The electric shifting device for the power take-off is applied to the electric shifting system for the power take-off. The electric shifting device for the power take-off includes a trapezoidal lead screw pair 4, a sliding pair 5, a first sleeve 6, a compression spring 7, a shift fork 8, a second sleeve 9, a gear 10, and a second shaft 11.

[0031] The trapezoidal lead screw assembly 4, the sliding assembly 5, the first sleeve 6, the compression spring 7, the shift fork 8, the second sleeve 9, and the second shaft 11 are installed inside the main body of the power take-off electric shifting device.

[0032] The trapezoidal lead screw assembly 4 is connected to the torque transmission sliding assembly 5, the torque transmission sliding assembly 5 is connected to the shift fork 8, the shift fork 8 is connected to the first sleeve 6, and the first sleeve 6 is connected to the second shaft 11 through a gear.

[0033] Specifically, the power take-off electric shifting device further includes: the compression spring 7, the second sleeve 9, the gear 10, and the second shaft 11;

[0034] After the sliding joint 5 is subjected to the force transmitted by the trapezoidal screw joint 4, the sleeve compresses the spring 7 during the forward operation of the motor. During the reverse operation of the motor, the spring 7 pushes the sleeve, which in turn pushes the shift fork 8 to move to the right. The shift fork 8 is connected to the second sleeve 9, and the shift fork 8 then pushes the second sleeve 9 to move to the right. The second sleeve 9 is connected to the gear 10, and the second shaft 11 is connected to the gear 10. The torque transmitted from the second shaft 11 is transmitted to the gear 10 through the second sleeve 9 for power take-off.

[0035] Specifically, the power take-off electric shifting device includes: a motor shaft 2 installed between the motor 1 and the coupling 3; the motor 1 outputs a corresponding torque, which is transmitted through the motor shaft 2; the motor shaft 2 is connected to the coupling 3 via a flat key; the torque transmitted from the motor shaft 2 is transmitted to the coupling; the coupling 3 is also connected to a trapezoidal lead screw pair 4; the coupling 3 transmits torque to the trapezoidal lead screw pair 4; after receiving the torque, the trapezoidal lead screw pair 4 converts the torque into the translation of the sliding pair 5.

[0036] Specifically, the motor control unit includes a controller that sends a stop torque output command to the motor 1. After the motor 1 executes the stop torque output command, the motor 1 stops working, the motor shaft 2 stops rotating, and the trapezoidal lead screw pair 4 remains in its current position to ensure that the gear position remains unchanged.

[0037] Specifically, the motor control unit includes a controller that sends a reverse motion command to the motor 1. After receiving the reverse motion command from the controller, the motor 1 starts to move in the reverse direction. The motor 1 outputs a reverse torque and transmits the torque to the trapezoidal lead screw pair 4. The torque is converted into a leftward translation of the sliding pair 5 through the trapezoidal lead screw pair 4. The first sleeve 6 is pushed to the left by the compression spring 7, which in turn pushes the shift fork 8 to move to the left and disengage from the gear 10.

[0038] The present invention describes a power take-off (PTO) electric shifting technology system, which is applicable to new energy vehicles with corresponding requirements.

[0039] The system includes the following components:

[0040] Motor control unit: Used for gear shift control, processing, filtering and executing gear shift data;

[0041] The drive shaft unit is used to transmit the transmission torque from the motor to the power take-off (PTO), outputting it to the corresponding actuator for gear shifting and power take-off. It also achieves self-locking. After the gear shift is completed, the motor stops outputting torque, and the PTO maintains its current position to ensure that the gear remains unchanged.

[0042] This invention can control the motor of the power take-off system based on the instructions transmitted from the automatic transmission of new energy vehicles. It uses the vehicle controller to collect information such as the driver's shifting intentions and performs corresponding calculations to accurately determine the gear position of the vehicle and realize automatic gear shifting.

[0043] Simultaneously, the torque transmitted from motor 1 is transmitted to the power take-off (PTO). Power is generated via motor shaft 2, transmitted through coupling 3 to trapezoidal lead screw pair 4, and then the torque transmitted from trapezoidal lead screw pair 4 is transmitted to sliding pair 5 for output. The output is directed to the right for movement. Then, shift fork 8 pushes the rotating first sleeve 6 to move to the right. At this time, the first sleeve 6 engages with the gear, driving the second shaft 11 gear to rotate. The force is then transmitted to the next stage gear for power take-off through gear meshing, and self-locking is achieved. After the gear shift is completed, the motor stops outputting torque, and the PTO maintains its current position to ensure that the gear remains unchanged.

[0044] The innovative aspects of this invention are as follows:

[0045] We propose a shift-mode power take-off (PTO) technology based on motor 1 control, which replaces the traditional pneumatic and hydraulic PTOs. Currently, only some motor-driven PTOs have motors that cannot stop rotating and are prone to burnout. This PTO, which we have pioneered, is a safe and reliable PTO for intermittent operation.

[0046] This power take-off (PTO) can achieve self-locking through a self-locking structure such as a trapezoidal lead screw or a worm gear, or it can use an electromagnetic brake, officially called an electromagnetic power-off brake. The brake is installed on the motor shaft 2. When energized, it opens, allowing the motor to rotate freely. When de-energized, it locks, preventing the motor 1 from rotating. The motor 1 stops outputting torque, and the PTO maintains its current position to ensure the gear remains unchanged. This patent uses a trapezoidal lead screw pair 4 as an example.

[0047] The operating process and steps of the power take-off device in the actual application system of this application are as follows:

[0048] Step 1: Shift command issued

[0049] The automatic transmission sends shift commands to the motor controller. After receiving the commands, the motor controller sends commands to motor 1, and the motor begins to execute the commands and work.

[0050] Step 2: Motor output torque

[0051] After receiving the command from the controller, motor 1 outputs the corresponding torque according to the information sent by the controller. After completing the torque output, the controller issues a stop command, and the motor stops outputting torque.

[0052] Step 3: Torque Transmission

[0053] Motor 1 outputs the corresponding torque, which is transmitted through motor shaft 2. Motor shaft 2 is connected to coupling 3 via a flat key. The torque transmitted from motor shaft 2 is transmitted to coupling 3, which is then connected to trapezoidal lead screw pair 4, transmitting torque to trapezoidal lead screw pair 4. After receiving the torque, trapezoidal lead screw pair 4 converts the torque into the translation of sliding pair 5.

[0054] Step 4: Power Take-Off (PTO)

[0055] After receiving the force transmitted by the trapezoidal lead screw pair 4, the movable pair 5 pushes the first sleeve 6 to move to the right, which in turn pushes the shift fork 8 to move to the right. The shift fork 8 then pushes the second sleeve 9 to move to the right, engaging with the gear 10. After engagement, the torque transmitted from the second shaft 11 is transmitted to the gear 10 through the sleeve, finally achieving power take-off.

[0056] Step 5: Implement self-locking

[0057] After shifting gears, the controller sends a command to motor 1 to stop outputting torque. At this time, motor 1 stops working and motor shaft 2 stops rotating. Due to the self-locking characteristic of trapezoidal lead screw pair 4, trapezoidal lead screw pair 4 remains in its current position and does not rotate, thereby ensuring that the gear position remains unchanged.

[0058] Step 6: End of power take-off

[0059] After completing the forward motion and taking power, the controller sends a command to motor 1, and the motor begins to move in the reverse direction. Motor 1 outputs reverse torque, which is transmitted to the trapezoidal lead screw pair 4. The trapezoidal lead screw pair converts the torque into a leftward translation of the prismatic joint 5. The first sleeve 6 moves to the left under the thrust of the compression spring 7, which in turn pushes the shift fork 8 to move to the left, disengaging it from the gear 10, and finally stopping taking power.

[0060] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. Additionally, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., are not necessarily different. The embodiments of the present application described above do not constitute a limitation on the scope of protection of this application.

[0061] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using control software and necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as an in-vehicle computer, an internet cloud server, a hard disk, ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions to cause a computer device (which may be an in-vehicle computer, a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or certain parts of the embodiments of the present invention. The above-described embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A power take-off electric gear shifting device and system, characterized by, Including motor control unit, transmission shaft unit and motor (1), the transmission shaft unit is connected with the motor control unit and motor; The motor control unit is used for arranging, screening and transmitting gear shifting data to the transmission shaft unit, gear shifting control and driving control; The transmission shaft unit: the transmission shaft unit includes a shaft coupling (3) and a power takeoff electric gear shifting device, the power takeoff electric gear shifting device is connected with the motor (1) through the shaft coupling (3), the transmission shaft unit is used for transmitting the transmission torque from the motor (1) to the power takeoff, output to the power takeoff electric gear shifting device to gear shifting power takeoff, and self locking, after gear shifting is completed, the motor stops outputting torque, the power takeoff keeps the existing position to ensure that the gear position does not change; The power takeoff electric gear shifting device is applied to the power takeoff electric gear shifting system, the power takeoff electric gear shifting device includes a trapezoidal screw pair (4), a moving pair (5), a first sleeve (6), a compression spring (7), a shift fork (8), a second sleeve (9), a gear (10) and a second shaft (11); The trapezoidal screw pair (4), the moving pair (5), the first sleeve (6), the compression spring (7), the shift fork (8), the second sleeve (9) and the second shaft (11) are installed inside the power takeoff electric gear shifting device body; The trapezoidal screw pair (4) is connected with the moving pair (5), the torque is transmitted to the moving pair (5) and the shift fork (8) is connected, the shift fork (8) is connected with the first sleeve (6), and the first sleeve (6) is connected with the second shaft (11) through the gear; Also includes; the compression spring (7), the second sleeve (9), the gear (10) and the second shaft (11); After the moving pair (5) is subjected to the force transmitted by the trapezoidal screw pair (4), the moving pair (5) pushes the first sleeve (6) to move right, and then pushes the shift fork (8) to move right, the shift fork (8) and the second sleeve (9), the shift fork (8) pushes the second sleeve (9) to move right, the second sleeve (9) is connected with the gear (10), the second shaft (11) is connected with the gear (10), the torque transmitted from the second shaft (11) is transmitted to the gear (10) through the second sleeve (9), and is used for power takeoff; The motor (1) is connected with the shaft coupling (3), the motor (1) outputs corresponding torque, the torque is transmitted through the motor shaft (2), the motor shaft (2) and the shaft coupling (3) are connected through a flat key, the torque transmitted from the motor shaft (2) is transmitted to the shaft coupling, the shaft coupling (3) is also connected with the trapezoidal screw pair (4), the shaft coupling (3) transmits torque to the trapezoidal screw pair (4), after receiving the torque, the trapezoidal screw pair (4) converts the torque into the translation of the moving pair (5) through the trapezoidal screw pair (4); The motor control unit includes a controller, which sends a stop torque output command to the motor (1). After the motor (1) executes the stop torque output command, the motor (1) stops working, the motor shaft (2) stops rotating, and the trapezoidal lead screw pair (4) remains in its current position to ensure that the gear position remains unchanged. The motor control unit includes a controller. The controller sends a reverse motion command to the motor (1). After receiving the reverse motion command sent by the controller, the motor (1) starts to move in the reverse direction. The motor (1) outputs a reverse torque and transmits the torque to the trapezoidal lead screw pair (4). The torque is converted into a leftward translation of the sliding pair (5) through the trapezoidal lead screw pair (4). The first sleeve (6) is pushed to the left by the compression spring (7), which in turn pushes the shift fork (8) to move to the left and disengages from the gear (10).

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