Method for arranging electromagnetic clutch of power split transmission

Abstract

The invention discloses a method for arranging an electromagnetic clutch of a power split transmission, which is characterized in that the electromagnetic clutch is arranged between a gear Z2 and a gear Z3 of the power split transmission, the gear Z2 is arranged at two positions on the right side, the gear Z3 is arranged at the leftmost end, and the two ends of the electromagnetic clutch fix the electromagnetic clutch on a gearbox through bearings; according to the technical scheme, more effective control over power transmission at the engine end is achieved, whether power at the engine end is cut off or not is controlled, by means of the technical scheme, the electromagnetic clutch controls a power source at the engine end, meanwhile, the space in the gearbox is efficiently utilized, and the purposes of reducing oil consumption and increasing the driving mileage are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle transmission, and in particular relates to a method for arranging an electromagnetic clutch of a power split transmission. Background Art

[0002] The electrification of automobile power systems has become a current development trend. Hybrid systems have advantages such as mature structure and low cost. The power-split hybrid transmission with dual motors can achieve engine range optimization and reduce vehicle fuel consumption. This type is represented by Toyota's THS hybrid products. By adding an electromagnetic clutch to the power-split transmission, the combination of the engine power source is controlled, the vehicle's energy utilization rate is improved, and the mileage is increased. SAIC-GM-Wuling Xingchen is a representative example. By installing an electromagnetic clutch, the mileage is increased and the fuel consumption is reduced. However, in the existing hybrid transmission structure, there is no structure that combines a power-split structure with an electromagnetic clutch. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for arranging an electromagnetic clutch of a power split transmission.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A method for arranging an electromagnetic clutch of a power split transmission, wherein the electromagnetic clutch is arranged between gears Z2 and Z3 of the power split transmission, with the Z2 gear located at two positions on the right and the Z3 gear located at the far left. The two ends of the electromagnetic clutch rely on bearings to fix the electromagnetic clutch on the transmission, thereby achieving more effective control of power transmission at the engine end and controlling whether the power at the engine end is cut off.

[0006] Preferably, there are Z2 at both ends of the electromagnetic clutch, and Z2 is two identical gears. A needle bearing is connected to the right end where Z2 is connected to the shaft, and the left end Z2 is directly interference fit with the shaft. At the far left end, there is a Z3 gear and the two Z2 gears are located on the same shaft; there is a gear clamp structure at the Z2 gear at the right end, and the right side of the Z2 gear at the right end is the coil of the electromagnetic clutch, and the lower end of the coil is the propulsion assembly of the electromagnetic clutch; the function of the electromagnetic clutch on the power split transmission is to control whether the power source at the engine end is used as a connection tool for the direct-drive vehicle.

[0007] Preferably, when the car is used as an extended-range vehicle, the jaws in the electromagnetic clutch are separated, and the Z2 gear at the left end and the Z2 gear at the right end of the electromagnetic clutch are decoupled; in hybrid drive, when the Z2 gear at the left end and the Z2 gear at the right end of the electromagnetic clutch are decoupled, it can be used as an extended-range vehicle, and the engine directly transmits power to the generator ISG, which plays a role in speed regulation.

[0008] Preferably, when the vehicle is traveling at a low speed, the drive motor serves as a power source to drive the vehicle forward; when the vehicle reaches a certain high speed, the electromagnetic clutch starts working, and quickly couples the rightmost Z2 gear that is decoupled from the shaft with the shaft; when the electromagnetic clutch is working, the electromagnetic clutch coil is energized to generate an electromagnetic force that pushes the propulsion assembly under the coil, and the propulsion assembly pushes the pliers plate so that the pliers plate is connected to the Z2 gear on the right end, thereby transmitting the power at the upper end of the right end Z2 gear to the shaft and then transmitting the power to the next gear; when the electromagnetic clutch is not working, there is a needle bearing at the lower end of the right end Z2 gear, and the pliers plate at the right end Z2 is separated by a reset spring, and the power at the engine end is transmitted to the right end Z2 gear, which rotates by itself, thereby cutting off the power at the engine end.

[0009] Preferably, when driving in extended-range mode, the drive motor TM is used alone for driving, the engine drives the ISG motor to charge the battery, the electromagnetic clutch is disconnected, and the drive motor TM end transmits power to gear Z5 through the shaft connection with Z5, gear Z5 meshes with gear Z2, and gear Z5 transmits power to gear Z2 on the left end of the electromagnetic clutch. The left end gear of Z2 at the electromagnetic clutch is coaxially connected with gear Z3, and then the power of gear Z2 on the left end of the electromagnetic clutch is transmitted to gear Z3 through the shaft, gear Z3 meshes with gear Z4, and the power at gear Z3 is transmitted to Z4 and then to the differential and then to the tire; at this time, the motor ISG achieves zero speed of the shaft where S2 is located through speed control.

[0010] As a preferred embodiment, in hybrid driving mode, the electromagnetic clutch is engaged to enter the power split hybrid mode. When working in the hybrid mode, the power system works in the power split driving mode. The shaft where the sun gear S1 is located, the shaft where the sun gear S2 is located, and the hollow shaft connected to the Z1 gear and the planetary carrier Pc, the three shafts constitute a three-shaft transmission system, and the planetary gear power split mechanism realizes the power coupling between the engine, the motor and the power output; the generator works in a positive speed and negative torque state, obtains power from the engine end and converts it into electrical energy to supply to the battery to charge the battery and supply the drive motor TM, so that part of the engine power is transmitted in the form of electrical power, and the rest of the power is transmitted in a mechanical path. The power system exhibits the characteristics of power split when working; the generator ISG adjusts its own speed to make the engine work in a low fuel consumption range. When the vehicle is driving in hybrid mode, the engine is allowed to work in the lowest fuel consumption range, and the speed control of the two motors is used to achieve stepless speed regulation of the whole vehicle.

[0011] Preferably, the gears Z2 and Z3 are cylindrical gears.

[0012] The present invention arranges an electromagnetic clutch on a power split hybrid transmission to control the engine-end power source through the electromagnetic clutch, and at the same time achieves efficient use of the space inside the transmission to achieve the purpose of reducing fuel consumption and increasing mileage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] Figure 1 This is a schematic structural diagram of an electromagnetic clutch according to an embodiment of the present invention;

[0015] Figure 2 Schematic diagram of the electromagnetic clutch layout of the power split transmission. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Embodiment 1:

[0019] The embodiment of the present invention provides a method for arranging an electromagnetic clutch of a power split transmission, such as Figure 2 As shown in the figure, the dotted box is the layout position of the electromagnetic clutch, which is located in the middle space of the power split transmission. To arrange the clutch at this position, only a set of gears needs to be added, which can greatly save the space layout in the box. Figure 1 As shown: the Z2 gear is located at two positions on the right, the Z3 gear is located at the far left, and the two ends of the electromagnetic clutch rely on bearings to fix the electromagnetic clutch on the gearbox, thereby achieving more effective control of the power transmission at the engine end and controlling whether the power at the engine end is cut off. The present invention focuses on arranging the electromagnetic clutch at the position of the power split transmission, which is arranged between gears Z2 and Z3. Under the premise of ensuring that the electromagnetic clutch works, the space in the power split transmission is better utilized. When the car is used as an extended-range vehicle, such as Figure 1As shown, the toothed discs in the electromagnetic clutch are separated, and the left Z2 gear and the right Z2 gear of the electromagnetic clutch are decoupled. In hybrid drive, when the left Z2 gear and the right Z2 gear in the electromagnetic clutch are decoupled, it can be used as an extended-range vehicle, and the engine directly transmits power to the generator ISG, which plays a role in speed regulation, so that the engine always runs in a low fuel consumption range and charges efficiently; before the toothed discs are engaged, the generator ISG regulates the engine speed, and after reaching the appropriate speed, the toothed discs are engaged, and the power at the engine end is transmitted to the gear Z1 through the planetary gear mechanism, and the gear Z1 is engaged with the gear Z2, and then the power is transmitted, and the power coupling between the engine, the motor and the power output is achieved. The generator works in a positive speed and negative torque state, obtains power from the engine end and converts it into electrical energy to supply to the battery to charge the battery or to the drive motor TM for use, so that part of the engine power is transmitted in the form of electrical power, and the rest of the power is transmitted in a mechanical path. When the power system is working, it shows the characteristics of power diversion. The generator ISG adjusts its own speed to make the engine work in a low fuel consumption range, thereby preventing the engine from being affected by driving conditions. When the vehicle is driving in hybrid mode, the engine is operated in the lowest fuel consumption range, and the speed control of the two motors achieves stepless speed regulation of the entire vehicle.

[0020] The schematic diagram of the electromagnetic clutch structure used in the present invention is as follows: Figure 1 As shown, there are Z2 on both ends of the electromagnetic clutch. Z2 is two identical gears. There is a needle bearing connected to the right end Z2 and the shaft, while the left end Z2 is directly interference fit with the shaft. At the far left end, there is a Z3 gear and two Z2 gears on the same shaft. There is a toothed plate structure at the right end Z2 gear, and on the right side of the right end Z2 gear is the coil of the electromagnetic clutch, and at the lower end of the coil is the propulsion assembly of the electromagnetic clutch. The role of the electromagnetic clutch in the power split transmission is to control whether the power source at the engine end is used as a connection tool for the direct drive vehicle. When the vehicle is driving at a low speed, the drive motor is used as a power source to drive the vehicle forward; when the vehicle reaches a certain high speed, the electromagnetic clutch starts to work and quickly couples the rightmost Z2 gear that is decoupled from the shaft with the shaft. When the electromagnetic clutch is working, the electromagnetic clutch coil is energized to generate an electromagnetic force that pushes the propulsion assembly under the coil. The propulsion assembly pushes the pliers plate so that the pliers plate is connected to the Z2 gear on the right end, and then the power at the upper end of the Z2 gear on the right end is transmitted to the shaft and then the power is transmitted to the next gear; when the electromagnetic clutch is not working, there is a needle bearing at the lower end of the Z2 gear on the right end, and the pliers plate at the Z2 gear on the right end is separated by a reset spring, and the power at the engine end is transmitted to the Z2 gear on the right end and rotates by itself, thereby cutting off the power at the engine end.

[0021] The present invention arranges an electromagnetic clutch in the structure of a dual planetary gearbox power split hybrid transmission, which includes a planetary reduction structure and two motors, which are used for driving and speed regulation, wherein the ISG motor is used for speed regulation of the engine and the TM motor is used for driving the vehicle forward. Figure 2 As shown, in the power split hybrid transmission, there are S1, S2, two sun gears in the planetary gear structure, S1 is connected to the ISG motor, S2 is connected to the ICE engine end, and the sun gear S2 at the engine ICE end is the input end. P1 and P2 are planetary gears in the planetary gear structure, Pc is a planet carrier in the planetary gear structure, and Z1 is a reduction gear, which is rigidly connected through a hollow shaft between Pc and Z1 ends. Both P1 and P2 planetary gears are cylindrical gears. P1 and P2 are fixedly connected to form a stepped planetary gear set, and there is a needle bearing at the connection between the planetary gear set and the shaft, so that the P1 and P2 planetary gear sets can rotate around the planet carrier Pc and can revolve around the sun gears S1 and S2. The stepped planetary gear set is designed in multiple ways and all stepped planetary gear sets are arranged along the circumferential direction on the planet carrier Pc. The shaft connected to S1 is connected to S2, and the two shafts are coaxially arranged.

[0022] like Figure 2 As shown, the virtual frame part is the electromagnetic clutch, Z2 and Z3 are cylindrical gears, and the two gears are connected by the same shaft. The Z2 gear on the right end of the electromagnetic clutch meshes with the Z1 gear to form a deceleration gear set. The Z1 gear is the output end of the planetary gear structure. The TM end drive motor is connected to the Z5 gear through a shaft connection, and the Z5 gear is also meshed with the Z2 gear on the left end of the electromagnetic clutch, where Z5 is also a cylindrical gear. The Z4 gear is the gear on the differential Diff, and the Z4 gear meshes with the Z3 gear, where the Z4 gear is also a cylindrical gear. Through the power transmission, the power process of the engine is: through the sun gear S2 to the planetary gears P1 and P2 to the planet carrier Pc, the planet carrier Pc is connected to the hollow shaft of Z1, and the power is transmitted to Z1, Z1 meshes with Z2 and then to Z2, Z2 and Z3 are connected to Z3 through the shaft, and Z3 meshes with Z4, and then the power is transmitted to Z4 and then to the output end of the differential Diff. The power transmission of the drive motor TM is as follows: the drive motor TM end transmits power to gear Z5 through the shaft connection with gear Z5, gear Z5 meshes with gear Z2, gear Z5 transmits power to gear Z2, gear Z2 and gear Z3 are coaxially connected, and then the power of gear Z2 is transmitted to gear Z3 through the shaft, gear Z3 meshes with gear Z4, and the power at gear Z3 is transmitted to Z4 and then to the differential and then to the tire.

[0023] When driving in extended-range mode, the drive motor TM is used alone to drive, and the engine drives the ISG motor to charge the battery. The driving path is as follows: Figure 2 As shown: the electromagnetic clutch is disconnected, the drive motor TM end transmits power to gear Z5 through the shaft connection between Z5, gear Z5 meshes with gear Z2, and gear Z5 transmits power to gear Z2 on the left end of the electromagnetic clutch. The gear Z2 on the left end of the electromagnetic clutch is coaxially connected with gear Z3, and then the power of gear Z2 on the left end of the electromagnetic clutch is transmitted to gear Z3 through the shaft, gear Z3 meshes with gear Z4, and the power at gear Z3 is transmitted to Z4 and then to the differential and then to the tire. At this time, the motor ISG achieves zero speed of the shaft where S2 is located through speed control to avoid dragging the generator during pure electric driving.

[0024] In hybrid driving mode, Figure 2 As shown, the electromagnetic clutch is engaged and enters the power split hybrid mode. When working in the hybrid mode, the power system works in the power split drive mode. The shaft where the sun gear S1 is located, the shaft where the sun gear S2 is located, and the hollow shaft connected to the Z1 gear and the planetary carrier Pc, the three shafts constitute a three-shaft transmission system, and the planetary gear power split mechanism realizes the power coupling between the engine, the motor and the power output. The generator works in a positive speed and negative torque state, obtains power from the engine end and converts it into electrical energy to supply to the battery to charge the battery and supply the drive motor TM, so that part of the engine power is transmitted in the form of electrical power, and the rest of the power is transmitted in a mechanical path. The power system exhibits the characteristics of power split when working. The generator ISG adjusts its own speed to make the engine work in a low fuel consumption range, thereby avoiding the engine being affected by the driving conditions. When the vehicle is driving in hybrid mode, the engine is allowed to work in the lowest fuel consumption range, and the speed control of the two motors is used to achieve stepless speed regulation of the whole vehicle.

[0025] The present invention arranges the electromagnetic clutch in the power split hybrid power transmission, so that the energy provided by the engine can be better utilized when the vehicle is in hybrid drive, and the kinetic energy is converted into electrical energy to charge the battery when driving at normal medium and low speeds, so that it can be used as an extended-range vehicle. When a certain vehicle speed is reached, the electromagnetic clutch is connected, and the power coupling between the engine, the motor and the power output is achieved to achieve the effect of power splitting. At the same time, the present invention arranges the electromagnetic clutch according to the structure of the power split hybrid transmission, such as Figure 2 As shown, the dotted frame is the layout position of the electromagnetic clutch, which does not affect the normal operation of the power split transmission, and can also realize the combination of the electromagnetic clutch in the transmission, and can also realize the space utilization of the transmission. The present invention realizes the combination of the electromagnetic clutch and the power split hybrid transmission, and the energy utilization of the whole vehicle is also greatly improved, so that the engine is always in the low fuel consumption range, thereby achieving the purpose of increasing the vehicle's mileage.

[0026] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for arranging an electromagnetic clutch of a power split transmission, characterized in that: The electromagnetic clutch is arranged between gears Z2 and Z3 of the power split transmission, with the Z2 gear located at two positions on the right and the Z3 gear located at the far left. The two ends of the electromagnetic clutch rely on bearings to fix the electromagnetic clutch on the transmission, so as to achieve more effective control of power transmission on the engine end and control whether the power on the engine end is cut off.

2. The method for arranging the electromagnetic clutch of a power split transmission as claimed in claim 1, characterized in that: There are Z2 at both ends of the electromagnetic clutch. Z2 is two identical gears. There is a needle bearing connected to the right end where Z2 is connected to the shaft, and the left end Z2 is directly interference fit with the shaft. At the far left end, there is a Z3 gear and two Z2 gears on the same shaft; there is a gear clamp structure at the right end Z2 gear, and on the right side of the right end Z2 gear is the coil of the electromagnetic clutch, and at the lower end of the coil is the propulsion assembly of the electromagnetic clutch; the function of the electromagnetic clutch in the power split transmission is to control whether the power source at the engine end is used as a connection tool for the direct-drive vehicle.

3. The method for arranging the electromagnetic clutch of a power split transmission as claimed in claim 2, characterized in that: When the car is used as an extended-range vehicle, the jaws in the electromagnetic clutch are separated, and the Z2 gear on the left and the Z2 gear on the right of the electromagnetic clutch are decoupled; in hybrid drive, when the Z2 gear on the left and the Z2 gear on the right in the electromagnetic clutch are decoupled, it can be used as an extended-range vehicle, and the engine directly transmits power to the generator ISG, which plays a role in speed regulation.

4. The method for arranging an electromagnetic clutch of a power split transmission as claimed in claim 3, characterized in that: When the vehicle is traveling at a low speed, the drive motor acts as a power source to drive the vehicle forward; when the vehicle reaches a certain high speed, the electromagnetic clutch starts working, and quickly couples the rightmost Z2 gear that is decoupled from the shaft with the shaft; when the electromagnetic clutch is working, the electromagnetic clutch coil is energized to generate an electromagnetic force to push the propulsion assembly under the coil, and the propulsion assembly pushes the pliers plate so that the pliers plate is connected to the Z2 gear on the right end, and then the power at the upper end of the right end Z2 gear is transmitted to the shaft and then the power is transmitted to the next gear; when the electromagnetic clutch is not working, there is a needle bearing at the lower end of the right end Z2 gear, and the pliers plate at the right end Z2 is separated by a reset spring, and the power at the engine end is transmitted to the right end Z2 gear where it rotates by itself, thereby realizing the cutting off of the power at the engine end.

5. The method for arranging the electromagnetic clutch of a power split transmission as claimed in claim 4, characterized in that: When driving in extended-range mode, the drive motor TM is used alone for driving, the engine drives the ISG motor to charge the battery, the electromagnetic clutch is disconnected, and the drive motor TM end transmits power to gear Z5 through the shaft connection with Z5. Gear Z5 meshes with gear Z2, and gear Z5 transmits power to gear Z2 on the left end of the electromagnetic clutch. The left end gear of Z2 at the electromagnetic clutch is coaxially connected with gear Z3, and then the power of gear Z2 on the left end of the electromagnetic clutch is transmitted to gear Z3 through the shaft. Gear Z3 meshes with gear Z4, and the power at gear Z3 is transmitted to Z4 and then to the differential and then to the tire; at this time, the motor ISG achieves zero speed of the shaft where S2 is located through speed control.

6. The method for arranging an electromagnetic clutch of a power split transmission as claimed in claim 5, characterized in that: In hybrid driving mode, the electromagnetic clutch is engaged and enters the power split hybrid mode. When working in hybrid mode, the power system works in the power split driving mode. The shaft where the sun gear S1 is located, the shaft where the sun gear S2 is located, and the hollow shaft connected to the Z1 gear and the planetary carrier Pc, the three shafts constitute a three-shaft transmission system, and the planetary gear power split mechanism realizes the power coupling between the engine, the motor and the power output; the generator works in a positive speed and negative torque state, obtains power from the engine end and converts it into electrical energy to supply to the battery to charge the battery and supply the drive motor TM, so that part of the engine power is transmitted in the form of electrical power, and the rest of the power is transmitted in a mechanical path. The power system shows the characteristics of power split when working; the generator ISG adjusts its own speed to make the engine work in a low fuel consumption range. When the vehicle is driving in hybrid mode, the engine is allowed to work in the lowest fuel consumption range. Through the speed control of the two motors, the whole vehicle can achieve stepless speed regulation.

7. The method for arranging an electromagnetic clutch of a power split transmission as claimed in claim 1, characterized in that: Gears Z2 and Z3 are cylindrical gears.

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