CN205365238U - Power drive system based on single file star is arranged two and is kept off derailleur - Google Patents

Abstract

The utility model discloses an electric drive system based on a single planetary row two-speed transmission, which comprises a housing; a driving motor including a driving motor shaft; a double planetary wheel planetary row, the planetary frame of which is connected to the first planetary wheel and the second planetary wheel together. The planet carrier is fixed on the housing at the same time, and the sun gear is connected to the drive motor shaft; the output shaft is rotatably supported on the housing for power output; the first clutch is selectively combined and disengaged The ring gear and the output shaft; the second clutch, which selectively couples and disengages the sun gear and the output shaft; wherein, when the first gear is selected, the first clutch is engaged and the second clutch is disengaged; when When second gear is selected, the first clutch is disengaged and the second clutch is engaged. The utility model has fewer parts, compact structure, and is easy to install, and the driving motor has two working modes of motor and generator, which improves the energy utilization rate of the whole vehicle and achieves the effect of saving energy.

Description

An electric drive system based on a single planetary two-speed transmission

technical field

The utility model relates to the drive field, in particular to an electric drive system based on a single-planetary two-speed transmission.

Background technique

Electric vehicles are new, energy-saving and environmentally friendly vehicles, especially in today's environment with severe air pollution, they have great development potential and broad application prospects. An electric vehicle uses an electric motor to replace the engine of a traditional car. The electric motor can be started with load and can meet the requirements of the car through reasonable configuration, which is a big difference from the engine. It is no longer suitable to use multi-speed transmissions on electric vehicles, but if the variable speed transmission device is cancelled, it will be difficult to meet the requirements of vehicle climbing and high-speed driving, especially for small and medium-sized vehicles, it is necessary to redesign the power of electric vehicles according to the working characteristics of the electric motor system.

The current electric drive system for electric vehicles is more and more favored by people. Compared with the traditional drive system, the electric drive system for electric vehicles has great advantages, especially in terms of environmental protection. The layout of the existing two-speed transmissions for electric vehicles mostly adopts the parallel shaft type and the planetary row type. The two-speed transmissions that adopt the parallel shaft type layout usually use synchronizers or clutches to switch gears. If synchronizers, etc. are used to achieve The shifting of the gears has the following disadvantages: it is necessary to install a shift actuator separately, which increases the volume of the drive system, which is not convenient for the layout of the vehicle, and there is a power interruption during the shifting process; Two-speed transmissions mostly switch gears through clutches or brake combinations, but they have the following disadvantages: the shifting actuators are scattered, and the size of the transmission generally makes the drive system not compact enough.

Contents of the invention

It is an object of the present invention to solve the disadvantages of the above-mentioned planetary electric drive system and to provide at least the advantages that will be described later.

Another purpose of the utility model is to reasonably match the permanent magnet synchronous motor, the double planetary wheel planetary row and the clutch to solve the problems of the bulky direct drive motor, high performance requirements and interruption of gear shifting power of the mechanical transmission, so as to make the structure of the drive system more efficient. Compact and easy to install, it also reduces the performance requirements of the motor, reduces the complexity of the control system, improves the operating efficiency of the motor, and increases the driving range of the electric vehicle.

Another purpose of the utility model is that the drive motor has two working modes of motor and generator. When the vehicle is in the braking condition, the drive motor is converted into a generator mode, which can recover braking energy and improve the utilization of vehicle energy. Rate.

In order to achieve these purposes and other advantages according to the utility model, an electric drive system based on a single-planetary two-speed transmission is provided, including:

case;

a drive motor disposed within the housing and including a drive motor shaft; and

Double planet gear planet row, including first planet gear, second planet gear, sun gear, ring gear and planet carrier; wherein, the planet carrier connects the first planet gear and the second planet gear, and the planet carrier simultaneously fixed on the housing, the sun gear is connected to the drive motor shaft;

an output shaft, which is rotatably supported on the housing and used to output power;

a first clutch, disposed between the ring gear and the output shaft, selectively couples and disengages the ring gear and the output shaft;

a second clutch, disposed between the sun gear and the output shaft, selectively couples and disengages the sun gear and the output shaft; and

a cylindrical connecting hub, the center of which has a through hole for the output shaft to pass through, and the cylindrical connecting hub is fixedly connected to the output shaft at the through hole;

a support plate, which is fixedly connected to the sun gear and can rotate coaxially with the sun gear;

The support plate is selectively connected to the inner wall of the cylindrical connecting hub through the first clutch;

The inner ring gear is selectively connected to the outer wall of the cylindrical connecting hub through the second clutch;

Wherein, when the first gear is selected, the first clutch is engaged and the second clutch is disengaged; when the second gear is selected, the first clutch is disengaged and the second clutch is engaged.

Preferably, the drive motor also includes:

a rotor fixedly connected to the drive motor shaft;

The stator is fixedly connected with the housing.

Preferably, the housing includes a first accommodating cavity and a second accommodating cavity, and an inner wall is provided between the first accommodating cavity and the second accommodating cavity.

Preferably, a drive motor is arranged in the first accommodation chamber, and a double planetary gear planetary row is arranged in the second accommodation chamber.

Preferably, the planet carrier is fixedly connected to the inner wall.

Preferably, the first planetary wheel and the second planetary wheel are connected to the planetary carrier through needle bearings.

Preferably, the sun gear engages with the first planetary gear, the first planetary gear engages with the second planetary gear, and the second planetary gear engages with the ring gear.

Preferably, the drive motor is switched to generator mode when the vehicle brakes.

Preferably, when the reverse gear is selected, the first clutch is connected to the output shaft, the second clutch is disconnected, and the reverse power of the drive motor is transmitted to the output shaft through the ring gear.

The utility model at least includes the following beneficial effects: 1. The electric drive system is composed of a drive motor, a set of double planetary gear planetary row and a clutch assembly. The number of parts is small, the structure is compact, and it is easy to install. Less, effectively improve the transmission efficiency. 2. The permanent magnet synchronous drive motor and the two-speed transmission are integrated to reduce the use of raw materials, effectively reduce the cost of the electric drive system, and also reduce the performance requirements for the motor, reduce the complexity of the control system, and improve the performance of the motor. The operating efficiency increases the driving range of the electric vehicle. 3. The driving motor can be reversed, so the reverse gear is realized through the reverse gear of the motor, and the gear shift actuator for reverse gear is cancelled, the structure is more compact, and the reverse gear control is simple and easy to implement. 4. The driving motor has two working modes: electric motor and generator. When the whole vehicle is in the braking condition, the driving motor is converted into the generator mode to recover braking energy, improve the utilization rate of vehicle energy, and save energy Effect.

Other advantages, objectives and features of the utility model will partly be embodied through the following description, and partly will be understood by those skilled in the art through the research and practice of the utility model.

Description of drawings

Fig. 1 is a schematic structural diagram of the electric drive system of the single-planetary two-speed transmission of the present invention.

Fig. 2 is a cross-sectional view of the electric drive system of the single-planetary two-speed transmission of the present invention.

Fig. 3 is a schematic diagram of the structure of the planetary row of double planetary wheels of the present invention.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it by referring to the description.

It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

1 and 2 show the electric drive system structure of a single planetary two-speed transmission, including a housing 110 , a drive motor 120 , a double planetary planetary row 130 , a clutch assembly 140 and an output shaft 150 . Wherein, the speed change mechanism is composed of double planetary wheel planetary row 130 and clutch assembly 140 .

The casing 110 includes a first accommodation chamber and a second accommodation chamber, an inner wall is arranged between the first accommodation chamber and the second accommodation chamber, the driving motor 120 is arranged in the first accommodation chamber, and the driving motor shaft 123 of the driving motor 120 is connected from the second housing chamber. A receiving chamber enters the second receiving chamber through the inner wall, the speed change mechanism is disposed in the second receiving chamber, and the output shaft 150 passes through the second receiving chamber to the outside of the casing 110 .

The drive motor 120 includes a stator 121 , a rotor 122 and a drive motor shaft 123 , wherein the drive motor stator 121 is fixedly connected to the housing 110 through an interference fit, and the drive motor shaft 123 is connected to the rotor 122 through an interference fit.

When driving, the drive motor 120 is in motor mode, and when braking, the drive motor 120 is in generator mode.

As shown in FIG. 3 , the double planet gear planetary row 130 includes a sun gear 131 , a first planet gear 132 , a second planet gear 133 , an inner ring gear 134 and a double planet gear carrier 135 . Wherein, the sun gear 131 is connected with the output end of the drive motor shaft 123 through a spline, the sun gear 131 meshes with the first planetary gear 132, the first planetary gear 132 meshes with the second planetary gear 133, and the second planetary gear 133 meshes with the ring gear 134 internal meshing; wherein, the first planetary gear 132 and the second planetary gear 133 are mounted on the double planetary gear carrier 135 through needle bearings, and the double planetary gear carrier 135 is fixed on the housing 110 .

When the drive motor shaft 123 rotates, the sun gear 131 rotates in the same direction, the double planetary gear carrier 135 is fixed with the housing, and the first planetary gear 132 and the second planetary gear 133 only rotate around the axis of the double planetary gear carrier 135 , does not revolve, the rotation of the sun gear 131 is transmitted to the ring gear 134 through the rotation of the first planetary gear 132 and the second planet gear 133, and ensures that the rotation direction of the ring gear 134 is consistent with the rotation direction of the sun gear 131.

The clutch assembly 140 includes a first clutch 141 (normally open), a second clutch 142 (normally open), a cylindrical connection hub 143 and a support plate 144, one end of the first clutch 141 (normally open) is fixedly connected to the ring gear 134, The other end is separated from or combined with the outer wall of the cylindrical connecting hub 143, wherein a through hole is provided in the center of the cylindrical connecting hub 143, and the output shaft 150 is fixedly connected with the cylindrical connecting hub 143 through the through hole; the second clutch 142 (Normally open) One end is separated or combined with the support plate 144, and the other end is fixedly connected to the inner wall of the cylindrical connection hub 143, wherein the support plate 144 is fixedly connected to the drive motor shaft 123. When the first clutch 141 works, the ring gear 134 is connected to the first clutch 141, and the first clutch 141 is closely combined with the outer wall of the cylindrical connecting hub 143, so that the output shaft 150 fixedly connected with the cylindrical connecting hub 143 and The ring gear 134 moves synchronously; when the second clutch 141 is working, the support plate 144 fixedly connected with the drive motor shaft 123 is combined with the second clutch 142, and the inner wall of the cylindrical connection hub 143 fixedly connected by the second clutch 142, so that the drive The motor shaft 123 moves synchronously with the output shaft 150 .

The gear switching of the electric drive system is realized by the clutch assembly 140, and the gear shift actuators of the electric drive system are performed according to Table 1.

Table 1 Gear Execution Diagram of Electric Drive System

Among them, "○" means disengagement, "●" means engagement, Cl ₁ means the first clutch 141, and Cl ₂ means the second clutch 142.

In the first gear, the driving motor 120 rotates forward (the motor rotation direction to realize the forward rotation of the whole vehicle is the forward rotation direction), which drives the sun gear 131 to rotate, and the planetary carrier 135 is fixed to make the first planetary gear 132 and the second planetary gear 133 rotate , the power is transmitted to the ring gear 134, at this time, the first clutch 141 (normally open) works, that is, combined, the ring gear 134 is combined with the cylindrical connecting hub 143, so that the ring gear 134 and the output shaft 150 move synchronously , to realize the output of power; the second clutch 142 (normally open) does not work, that is, keeps the normally open state, and the support disc 144 is separated from the cylindrical connecting hub 143, so that the drive motor shaft 123 and the output shaft 150 are not transmitted.

During the second gear, the driving motor 120 rotates positively to drive the sun gear 131 to rotate, and the planetary carrier 135 is fixed to make the first planetary gear 132 and the second planetary gear 133 rotate, and the power is transmitted to the ring gear 134, and the first clutch 141 ( Normally open) does not work, that is, maintains the normally open state, the ring gear 134 and the output shaft 150 are not combined, and the second clutch 142 (normally open) works, that is, is combined, and the drive motor shaft 123 is connected with the output shaft 150, and the power is directly connected to the output shaft 150. output.

In the first gear, the drive motor 120 transmits power to the sun gear 131 through the drive motor shaft 123, the first clutch 141 (normally open) is engaged, and the power is transmitted to the output shaft 150 through the ring gear 134. One clutch 141 (normally open) is separated, the second clutch 142 (normally open) is combined, the power is directly transmitted to the output shaft 150 through the sun gear 131, and by controlling the first clutch 141 (normally open) and the second clutch 142 (normally open) ) to ensure the continuous transmission of power.

During the second gear, the second clutch 142 (normally open) is combined, and the drive motor 120 directly transmits the power to the output shaft 150 through the drive motor shaft 123. In the process of downshifting from the second gear to the first gear, the second clutch 142 (normally open) is separated, and the first The clutch 141 (normally open) is combined, the drive motor 120 is transmitted to the sun gear 131 through the drive motor shaft 123, and then transmitted to the ring gear 134 through the first planetary gear 132 and the second planetary gear 133, and finally transmitted through the ring gear 134 to the output shaft 150, and by controlling the first clutch 141 (normally open) and the second clutch 142 (normally open) to realize the smooth shifting of the gears and achieve the effect of smooth shifting.

When in reverse gear, the driving motor 120 reverses (opposite to the forward rotation direction), drives the sun gear 131 to rotate, and the planetary carrier 135 is fixed to make the first planetary gear 132 and the second planetary gear 133 rotate, and the power is transmitted to the ring gear 134. At this time, the first clutch 141 (normally open) is working, that is, combined, and the ring gear 134 is combined with the cylindrical connecting hub 143, so that the ring gear 134 and the output shaft 150 move synchronously to realize the output of power; Two clutches 142 (normally open) do not work, that is, keep the normally open state, and the support disc 144 is separated from the cylindrical connection hub 143, so that the drive motor shaft 123 and the output shaft 150 are not transmitted, and the vehicle is reversed.

When in neutral, both the first clutch 141 (normally open) and the second clutch 142 (normally open) remain inactive, so that the drive motor shaft 123 is separated from the output shaft 150, cutting off the transmission of power.

When the whole vehicle is running in first gear and needs to be braked, the driving motor 120 is switched from the motor mode to the generator mode, which plays a role in dragging the transmission system and converts the driving kinetic energy of the whole vehicle into electric energy.

When the whole vehicle needs to be braked when running in the second gear, the driving motor 120 is switched from the motor mode to the generator mode, the second clutch 142 (normally open) is separated, and the first clutch 141 (normally open) is combined, which plays a role in dragging the transmission system. Action, improve the efficiency of braking energy recovery.

As mentioned above, the utility model has the following beneficial effects: 1. The electric drive system is composed of a drive motor, a set of double planetary gears and a clutch assembly. The number of parts is small, the structure is compact, and it is easy to install. The number of gears is less, effectively improving the transmission efficiency. 2. The permanent magnet synchronous drive motor and the two-speed transmission are integrated to reduce the use of raw materials, effectively reduce the cost of the electric drive system, and also reduce the performance requirements for the motor, reduce the complexity of the control system, and improve the performance of the motor. The operating efficiency increases the driving range of the electric vehicle. 3. The driving motor can be reversed, so the reverse gear is realized through the reverse gear of the motor, and the gear shift actuator for reverse gear is cancelled, the structure is more compact, and the reverse gear control is simple and easy to implement. 4. The driving motor has two working modes: electric motor and generator. When the whole vehicle is in the braking condition, the driving motor is converted into the generator mode to recover braking energy, improve the utilization rate of vehicle energy, and save energy Effect.

Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and implementation. It can be applied to various fields suitable for the utility model. Additional modifications can readily be made by those skilled in the art. Therefore, the invention should not be limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (9)

1. An electric drive system based on a single planetary row two-speed transmission, characterized in that it comprises: case; a drive motor disposed within the housing and including a drive motor shaft; and Double planet gear planet row, including first planet gear, second planet gear, sun gear, ring gear and planet carrier; wherein, the planet carrier connects the first planet gear and the second planet gear, and the planet carrier simultaneously fixed on the housing, the sun gear is connected to the drive motor shaft; an output shaft, which is rotatably supported on the housing and used to output power; a first clutch, disposed between the ring gear and the output shaft, selectively couples and disengages the ring gear and the output shaft; a second clutch, disposed between the sun gear and the output shaft, selectively couples and disengages the sun gear and the output shaft; and a cylindrical connecting hub, the center of which has a through hole for the output shaft to pass through, and the cylindrical connecting hub is fixedly connected to the output shaft at the through hole; a support plate, which is fixedly connected to the sun gear and can rotate coaxially with the sun gear; The support plate is selectively connected to the inner wall of the cylindrical connecting hub through the first clutch; The inner ring gear is selectively connected to the outer wall of the cylindrical connecting hub through the second clutch; Wherein, when the first gear is selected, the first clutch is engaged and the second clutch is disengaged; when the second gear is selected, the first clutch is disengaged and the second clutch is engaged. 2. The electric drive system based on the single planetary two-speed transmission as claimed in claim 1, wherein the drive motor further comprises: a rotor fixedly connected to the drive motor shaft; The stator is fixedly connected with the housing. 3. The electric drive system based on a single-planetary two-speed transmission according to claim 1 or 2, wherein the housing includes a first accommodation chamber and a second accommodation chamber, and the first accommodation chamber and the second accommodation chamber An inner wall is arranged between the two accommodation chambers. 4 . The electric drive system based on a single-planetary two-speed transmission according to claim 3 , wherein a driving motor is arranged in the first accommodation chamber, and a double-planetary planetary row is arranged in the second accommodation chamber. 5. The electric drive system based on a single planetary two-speed transmission according to claim 4, wherein the planetary carrier is fixedly connected to the inner wall. 6. The electric drive system based on a single planetary two-speed transmission according to claim 1, wherein the first planetary wheel and the second planetary wheel are connected to the planetary carrier through needle bearings. 7. The electric drive system based on a single-planetary two-speed transmission according to claim 6, wherein the sun gear engages the first planetary gear, and the first planetary gear engages the second planetary gear , the second planetary gear meshes with the ring gear. 8. The electric drive system based on a single planetary two-speed transmission according to claim 5 or 7, wherein the drive motor is switched to a generator mode when the vehicle brakes. 9. The electric drive system based on a single planetary two-speed transmission as claimed in claim 8, wherein when reverse gear is selected, the first clutch is connected to the output shaft, the second clutch is disconnected, and the drive motor The reverse power is transmitted to the output shaft through the ring gear.