Power takeoff of electric actuating mechanism

Abstract

The utility model discloses a power takeoff of an electric actuating mechanism, which relates to the technical field of transmission power takeoff and comprises an input shaft, an input gear, a driving unit, a transmission unit and a self-locking unit. The input gear and the input shaft are coaxially arranged; the transmission unit comprises a rocker arm, the first end of the rocker arm is connected with the output end of the driving unit, the second end is connected with a shifting fork, the shifting fork is further connected with a sliding sleeve, the sliding sleeve is connected with an input shaft and an input gear, and the input gear is meshed with an output gear shaft. The shifting fork is connected with the self-locking unit. According to the power takeoff of the electric actuating mechanism, pneumatic elements such as an air cylinder and an air valve in a traditional pneumatic actuating mechanism are omitted, and a transmission unit composed of the rocker arm, the shifting fork and the sliding sleeve is used for replacing pneumatic drive; the transmission unit directly transmits power through a mechanical structure, the risk of compressed air leakage is avoided, and the requirements for sealing materials and the technology are remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of power take-off (PTO) technology, and in particular to an electric actuator PTO. Background Technology

[0002] As a key mechanical device connecting the transmission to external equipment, the power take-off (PTO) is widely used in commercial vehicles such as dump trucks and garbage trucks. It outputs power from the transmission on demand to drive equipment such as hydraulic pumps and air compressors, enabling vehicle lifting, loading, and unloading functions. In practical operation, the PTO needs to flexibly switch between neutral and working gears through its actuators according to the working scenario and conditions to precisely control the start, stop, and magnitude of power output.

[0003] Currently, most power take-off (PTO) actuators on the market adopt pneumatic structures, relying on the vehicle's air supply system. Compressed air drives the piston, which in turn drives the piston fork shaft to reciprocate, thus completing the gear shifting operation. However, this traditional pneumatic actuator has significant drawbacks: First, due to the difficulty in precisely controlling air pressure fluctuations, large shifting positioning deviations occur, which not only exacerbates gear wear but also generates strong shifting shocks, affecting the equipment's service life and operational comfort. Second, pneumatic systems have extremely high requirements for sealing performance; the seals of components such as cylinders and valves are prone to aging and leakage, leading to frequent failures and high maintenance costs. Third, as commercial vehicles accelerate their transformation towards new energy vehicles, "de-pneumaticization" has become an important development trend. The high dependence of pneumatic actuators on the air supply system makes them unsuitable for the architecture of pure electric and hybrid vehicles that lack or have insufficient air supply, severely restricting the integration optimization and lightweight design of commercial vehicle power systems. Utility Model Content

[0004] The purpose of this utility model is to provide an electric actuator power take-off device to overcome the shortcomings of the existing technology, such as low control accuracy, high sealing requirements, and dependence on air source system.

[0005] To achieve the above objectives, this paper adopts the following technical solution:

[0006] An electric actuator power take-off includes:

[0007] Input shaft, input gear, drive unit, transmission unit, self-locking unit;

[0008] The input gear and the input shaft are coaxially arranged;

[0009] The transmission unit includes a rocker arm, the first end of which is connected to the output end of the drive unit, and the second end of which is connected to a shift fork. The shift fork is also connected to a sliding sleeve, which is connected to an input shaft and an input gear respectively. The input gear meshes with an output gear shaft. The shift fork is connected to a self-locking unit.

[0010] Furthermore, the drive unit includes a ball screw and a motor, with the output end of the motor connected to the ball screw, which can convert rotational motion into linear motion.

[0011] Furthermore, the shift fork includes a shift fork groove and a shift fork foot, the second end of the rocker arm is inserted into the shift fork groove, and the shift fork foot is connected to a sliding sleeve.

[0012] Furthermore, the sliding sleeve is provided with a sliding sleeve groove into which the fork foot can be inserted.

[0013] Furthermore, the self-locking unit includes a shift fork shaft, a steel ball, a spring, and a self-locking plug. The shift fork shaft is connected to the shift fork, and a shift fork shaft groove is provided on the shift fork shaft. The steel ball can be embedded in the shift fork shaft groove, and the outer side of the steel ball abuts against the first end of the spring and is squeezed by the spring preload force. The second end of the spring abuts against the self-locking plug, and the self-locking plug is screwed into the housing threaded hole of the power take-off mechanical body.

[0014] Furthermore, it also includes a detection unit, which includes a displacement sensor disposed on the housing of the drive unit to detect the displacement of the rocker arm.

[0015] Furthermore, the output end of the motor is connected to a ball screw via a spline.

[0016] Furthermore, the shift fork shaft and the shift fork are connected by a set screw.

[0017] Furthermore, the input gear and input shaft are provided with external splines, and the sliding sleeve is provided with internal splines. The sliding sleeve is connected to the outside of the input gear through spline connection and can move along the axis of the input gear when shifting gears.

[0018] Furthermore, the ball screw is fitted with a protective sleeve, one end of which is fixed to the drive unit housing, and the other end of which can extend and retract with the linear movement of the ball screw.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention provides an electric actuator power take-off (PTO) that eliminates the pneumatic components such as cylinders and valves found in traditional pneumatic actuators. Instead, it replaces pneumatic drive with a transmission unit consisting of a rocker arm, shift fork, and sliding sleeve. This transmission unit directly transmits power through a mechanical structure, eliminating the risk of compressed air leakage and significantly reducing the requirements for sealing materials and processes. Compared to traditional pneumatic PTOs, this invention reduces potential failure points due to cylinder seal aging and valve leakage, significantly lowering the equipment failure rate. Furthermore, it eliminates the need for frequent seal inspection and replacement, significantly reducing maintenance workload and costs.

[0021] Specifically, this invention eliminates the reliance on the vehicle's air supply. In pure electric or hybrid vehicles, there is no need to configure components such as air pumps and air tanks, effectively freeing up interior space, facilitating vehicle layout optimization and lightweight design, and reducing vehicle energy consumption and manufacturing costs.

[0022] Specifically, this utility model uses a self-locking unit composed of a shift fork shaft, a steel ball, a spring, and a self-locking plug to replace the traditional pneumatic pressure-holding locking structure. When the sliding sleeve is in the correct position, the steel ball, under the preload of the spring, engages with the groove of the shift fork shaft, forming a reliable mechanical self-lock. Even in extreme situations such as air supply interruption or pipeline rupture, this mechanical self-locking unit can maintain a stable locking state, effectively preventing the power take-off from disengaging and ensuring the safe operation of the equipment. Attached Figure Description

[0023] Figure 1 A cross-sectional view of the power take-off unit of the electric actuator in an embodiment of this utility model. Figure 1 .

[0024] Figure 2 A cross-sectional view of the power take-off unit of the electric actuator in an embodiment of this utility model. Figure 2 .

[0025] Figure 3 This is a schematic diagram of the shift fork in an embodiment of this utility model.

[0026] Figure 4 This is a schematic diagram of the sliding sleeve in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the shift fork shaft in an embodiment of this utility model.

[0028] In the diagram, 1-sliding sleeve, 2-input shaft, 3-input gear, 4-output gear shaft, 5-ball screw, 6-rocker arm, 7-shift fork shaft, 8-set screw, 9-shift fork, 10-steel ball, 11-spring, 12-self-locking plug, 13-motor, 14-displacement sensor, 1a-sliding sleeve groove, 7a-shift fork shaft groove, 9a-shift fork groove, 9b-shift fork foot. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Example 1

[0032] See Figure 1 and Figure 2 This utility model provides an electric actuator power take-off (PTO), including an input shaft 2, an input gear 3, a drive unit, a transmission unit, and a self-locking unit. The input gear 3 and the input shaft 2 are coaxially arranged. The transmission unit includes a rocker arm 6, with one end connected to the output end of the drive unit and the other end connected to a shift fork 9. The shift fork 9 is also connected to a sliding sleeve 1, which is connected to both the input shaft 2 and the input gear 3. The input gear 3 meshes with an output gear shaft 4. The shift fork 9 is connected to the self-locking unit. The drive unit provides power, causing the rocker arm 6 to swing back and forth. The rocker arm 6 pushes the shift fork 9 to reciprocate. The shift fork 9 drives the sliding sleeve 1 to slide on the input shaft 2. When the sliding sleeve 1 slides to the position where it meshes with the input gear 3, the power from the input shaft 2 is transmitted to the sliding sleeve 1 through the input gear 3, and then to the output gear shaft 4, realizing power output and completing gear shifting. After gear shifting is completed, the self-locking unit locks the gear, ensuring the PTO remains stable during operation and avoiding the risk of disengagement.

[0033] Example 2

[0034] See Figure 1 , Figure 2 , Figure 3 and Figure 5This utility model provides an electric actuator power take-off, including an input shaft 2, an input gear 3, a drive unit, a transmission unit, and a self-locking unit. The drive unit includes a ball screw 5 and a motor 13. The output end of the motor 13 is connected to the ball screw 5, which converts rotational motion into linear motion. The input gear 3 and the input shaft 2 are coaxially arranged. The transmission unit includes a rocker arm 6. The first end of the rocker arm 6 is connected to the output end of the drive unit, and the second end is connected to a shift fork 9. The shift fork 9 includes a shift fork groove 9a and a shift fork foot 9b. The second end of the rocker arm 6 is inserted into the shift fork groove 9a, and the shift fork foot 9b is connected to a sliding sleeve 1. The sliding sleeve 1 is provided with a sliding sleeve groove 1a for the shift fork foot 9b to be inserted into. The sliding sleeve 1 is connected to the input shaft 2 and the input gear 3, and the input gear 3 meshes with an output gear shaft 4. The shift fork 9 is connected to the self-locking unit. Motor 13 outputs power, and the ball screw 5 connected to the output end converts the rotational motion into linear motion. The ball screw 5 pushes the rocker arm 6. When the rocker arm 6 swings, the second end of the rocker arm 6 pushes the shift fork 9 through the shift fork groove 9a. The fork foot 9b of the shift fork 9 inserts into the sliding sleeve groove 1a, causing the sliding sleeve 1 to move along the axis of the input gear 3. When the sliding sleeve 1 slides to the meshing position with the input gear 3, the power of the input shaft 2 is transmitted to the sliding sleeve 1 through the input gear 3, and then transmitted to the output gear shaft 4 by the sliding sleeve 1 to realize power output and complete gear shifting. After the gear shift is in place, the self-locking unit locks the gear.

[0035] In some preferred embodiments of this utility model, after the sliding sleeve 1 is fully engaged with the external spline of the input gear 3 through the internal spline, the power of the input shaft 2 is transmitted to the output gear shaft 4 through the sliding sleeve 1 and the input gear 3 in sequence to realize power output.

[0036] Example 3

[0037] See Figures 1 to 5 This utility model provides a power take-off (PTO) for an electric actuator, see reference. Figure 1 , Figure 2 , Figure 3 and Figure 5This utility model provides an electric actuator power take-off, including an input shaft 2, an input gear 3, a drive unit, a transmission unit, and a self-locking unit. The drive unit includes a ball screw 5 and a motor 13. The output end of the motor 13 is connected to the ball screw 5, which converts rotational motion into linear motion. The input gear 3 and the input shaft 2 are coaxially arranged. The transmission unit includes a rocker arm 6. The first end of the rocker arm 6 is connected to the output end of the drive unit, and the second end is connected to a shift fork 9. The shift fork 9 includes a shift fork groove 9a and a shift fork foot 9b. The second end of the rocker arm 6 is inserted into the shift fork groove 9a, and the shift fork foot 9b is connected to a sliding sleeve 1. The sliding sleeve 1 is provided with a sliding sleeve groove 1a for the shift fork foot 9b to be inserted into. The sliding sleeve 1 is connected to the input shaft 2 and the input gear 3 respectively. The input gear 3 meshes with an output gear. Wheel axle 4; shift fork 9 connects to self-locking unit, self-locking unit includes shift fork shaft 7, steel ball 10, spring 11 and self-locking screw plug 12, shift fork shaft 7 is connected to shift fork 9, shift fork shaft 7 is provided with shift fork shaft groove 7a, steel ball 10 can be embedded in shift fork shaft groove 7a and the outer side of steel ball 10 abuts against the first end of spring 11 and is squeezed by the pre-tightening force of spring 11, the second end of spring 11 abuts against self-locking screw plug 12, self-locking screw plug 12 is screwed into the housing thread hole of power take-off mechanical body.

[0038] Motor 13 outputs power, and the ball screw 5 connected to the output end converts the rotational motion into linear motion. The ball screw 5 pushes the rocker arm 6. When the rocker arm 6 swings, the second end of the rocker arm 6 pushes the shift fork 9 through the shift fork groove 9a. The fork foot 9b of the shift fork 9 inserts into the sliding sleeve groove 1a, causing the sliding sleeve 1 to move along the axis of the input gear 3. When the sliding sleeve 1 slides to the meshing position with the input gear 3, the power of the input shaft 2 is transmitted to the sliding sleeve 1 through the input gear 3, and then to the output gear shaft 4 through the sliding sleeve 1, realizing power output and completing gear shifting. After the gear shift is in place, the self-locking unit locks the gear. After the gear is in place, the shift fork shaft 7 moves synchronously with the shift fork 9. At this time, the steel ball 10 is embedded in the shift fork shaft groove 1a under the preload of the spring 11, forming a mechanical lock. This structure overcomes the axial force generated by vibration or sudden load changes through spring force, preventing the shift fork shaft 7 from accidentally moving and causing disengagement. When disengaging from gear, motor 13 drives ball screw 5 in the reverse direction, rocker arm 6 swings in the reverse direction, pushing shift fork 9 to move shift fork shaft 7. When the inclined surface of shift fork shaft groove 1a contacts steel ball 10, spring 11 is compressed, steel ball 10 disengages from groove, sliding sleeve 1 returns to its original position with shift fork 9, power transmission is interrupted, and disengaging from gear is completed.

[0039] In some preferred embodiments of this utility model, the ball screw 5 is covered with a protective sleeve. One end of the protective sleeve is fixed to the housing of the drive unit, and the other end extends and retracts with the linear movement of the ball screw 5.

[0040] In some preferred embodiments of this utility model, the shift fork shaft 7 and the shift fork 9 are connected by a set screw 8.

[0041] In some preferred embodiments of this utility model, a detection unit is also included, which includes a displacement sensor 14 disposed on the housing of the drive unit to detect the displacement of the rocker arm 6.

[0042] The electric actuator power take-off provided by this utility model works as follows:

[0043] 1. Gear shifting process

[0044] 1.1 Before shifting gears, the power of the transmission is transmitted from the input shaft 2 to the power take-off. At this time, the power take-off is in neutral, the input shaft 2 is always spinning, and the power cannot be output.

[0045] 1.2 When shifting gears, the ball screw 5 is driven by the motor 13 to rotate, causing the rocker arm 6 to swing forward. During the swing, the rocker arm 6 pushes the shift fork 9 forward, which in turn drives the sliding sleeve 1 to slide forward. At this time, the spline of the sliding sleeve 1 connects the input shaft 2 and the input gear 3, realizing the shifting operation.

[0046] 1.3 After shifting gears, the power from the transmission is transmitted from the input shaft 2 to the power take-off (PTO). At this time, the PTO is in the working gear position. Under the action of the spline connection of the sliding sleeve 1, the power is transmitted from the input shaft 2 to the input gear 3. Through gear meshing, the power is then transmitted to the output gear shaft 4, completing the power transmission process from the transmission to the PTO and then to the external working device, thus achieving the power take-off effect.

[0047] 2. Shifting out of gear

[0048] 2.1 Before downshifting, the power of the transmission is transmitted from the input shaft 2 to the power take-off (PTO). At this time, the PTO is in the working gear position. Under the action of the spline connection of the sliding sleeve 1, the power is transmitted from the input shaft 2 to the input gear 3. Through gear meshing, the power is then transmitted to the output gear shaft 4 to realize the power take-off process.

[0049] 2.2 When shifting to the next gear, the ball screw 5 is driven by the motor 13 to rotate, causing the rocker arm 6 to swing backward. During the swing, the rocker arm 6 pushes the shift fork 9 to move backward, which in turn drives the sliding sleeve 1 to slide backward. At this time, the spline of the sliding sleeve 1 is away from the input shaft 2 and is only connected to the input gear 3, thus realizing the shifting operation.

[0050] 2.3 After downshifting, the power from the transmission is transmitted from the input shaft 2 to the power take-off. At this time, the power take-off is in neutral, the input shaft 2 is always spinning, and power cannot be output.

[0051] After the sliding sleeve 1 is engaged in gear shifting, the steel ball 10 is engaged in the groove 1a of the shift fork shaft under the preload of the spring 11, forming a mechanical self-locking effect to avoid the risk of disengagement due to vibration or sudden load changes.

[0052] It should be noted that this article only uses a single working gear as an example to introduce the gear shifting process of the electric actuator power take-off. For multi-working gear scenarios, the gear shifting operation method is the same to be applicable to various application scenarios.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A power take-off (PTO) for an electric actuator, characterized in that, include: Input shaft (2), input gear (3), drive unit, transmission unit, self-locking unit; The input gear (3) and the input shaft (2) are coaxially arranged; The transmission unit includes a rocker arm (6), the first end of which is connected to the output end of the drive unit, and the second end is connected to a shift fork (9). The shift fork (9) is also connected to a sliding sleeve (1). The sliding sleeve (1) is connected to an input shaft (2) and an input gear (3) respectively. The input gear (3) meshes with an output gear shaft (4). The shift fork (9) is connected to a self-locking unit.

2. The electric actuator power take-off according to claim 1, characterized in that, The drive unit includes a ball screw (5) and a motor (13). The output end of the motor (13) is connected to the ball screw (5). The ball screw (5) is used to convert rotational motion into linear motion.

3. The electric actuator power take-off according to claim 1, characterized in that, The fork (9) includes a fork groove (9a) and a fork foot (9b). The second end of the rocker arm (6) is inserted into the fork groove (9a), and the fork foot (9b) is connected to the sliding sleeve (1).

4. The electric actuator power take-off according to claim 3, characterized in that, The slide sleeve (1) is provided with a slide sleeve groove (1a) into which the fork foot (9b) can be inserted.

5. The electric actuator power take-off according to claim 3, characterized in that, The self-locking unit includes a shift fork shaft (7), a steel ball (10), a spring (11), and a self-locking plug (12). The shift fork shaft (7) is connected to the shift fork (9). The shift fork shaft (7) is provided with a shift fork shaft groove (7a). The steel ball (10) can be embedded in the shift fork shaft groove (7a), and the outer side of the steel ball (10) abuts against the first end of the spring (11) and is squeezed by the pre-tightening force of the spring (11). The second end of the spring (11) abuts against the self-locking plug (12). The self-locking plug (12) is screwed into the housing thread hole of the power take-off mechanical body.

6. The electric actuator power take-off according to claim 1, characterized in that, It also includes a detection unit, which includes a displacement sensor (14) disposed on the housing of the drive unit to detect the displacement of the rocker arm (6).

7. The electric actuator power take-off according to claim 2, characterized in that, The output end of the motor (13) is connected to the ball screw (5) via a spline.

8. A power take-off device for an electric actuator according to claim 5, characterized in that, The shift fork shaft (7) and the shift fork (9) are connected by a set screw (8).

9. A power take-off device for an electric actuator according to claim 1, characterized in that, The input gear (3) and input shaft (2) are provided with external splines, and the sliding sleeve (1) is provided with internal splines. The sliding sleeve (1) is sleeved on the outside of the input gear (3) through spline connection and can move along the axis of the input gear (3) when shifting gears.

10. A power take-off device for an electric actuator according to claim 2, characterized in that, The ball screw (5) is covered with a protective sleeve. One end of the protective sleeve is fixed to the housing of the drive unit, and the other end can extend and retract with the linear movement of the ball screw (5).

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