Hybrid transmission and control method

Abstract

The present invention provides a hybrid transmission and control method, wherein the hybrid transmission includes a housing, a first gear gear set, and a synchronizer. The first gear gear set is provided with a coupling ring gear, and the synchronizer is provided with a gear sleeve. The hybrid transmission also includes a shift assembly and a compression spring. The shift assembly includes a shift motor, a shift hub, a shift fork shaft, and a shift fork. The shift fork is connected to the shift fork shaft. The shift motor is connected to the shift hub via the shift gear set. The shift hub is connected to the shift fork shaft via a shift finger. The compression spring is sleeved on the shift fork shaft. One end of the compression spring is connected to the housing, and the other end is connected to the shift fork. The shift fork compresses the compression spring. Through this application, a simpler structure is used to implement the parking function. This not only eliminates the traditional parking gear and parking arm mechanism, simplifies the parking structure, and achieves a lightweight design, but also has a compact structure. It can effectively reduce the production cost of the hybrid transmission and simplify the assembly process.

Description

Technical Field

[0001] The present invention relates to the field of transmissions, and in particular to a hybrid transmission and a control method thereof. Background Art

[0002] With the continuous development of science and technology, cars have gradually entered people's vision and lives. The development of cars has slowly affected our lives and brought great convenience to our lives. Nowadays, people’s means of transportation when going out are inseparable from cars. Cars have become an indispensable part of our lives.

[0003] The performance of the gearbox is an important factor in determining the quality of a car. At present, most cars are still mainly equipped with traditional gearboxes. Changing to a hybrid route based on the traditional gearbox is a relatively fast way to achieve hybrid power. Existing hybrid power gearboxes usually require a parking gear and a parking arm mechanism to achieve the parking function. There are many types of parts and a complex structure. The gearbox assembly process is also extremely cumbersome, which increases labor costs. Summary of the Invention

[0004] Based on this, an object of the present invention is to provide a hybrid transmission and a control method to address the deficiencies in the above-mentioned prior art.

[0005] To achieve the above objectives, the present invention provides a hybrid transmission, comprising a housing, a first gear gear set and a synchronizer arranged in the housing, the first gear gear set being provided with a coupling ring gear, the synchronizer being provided with a gear sleeve, the hybrid transmission further comprising a shift assembly and a compression spring arranged in the housing, the shift assembly being used to change gears, the shift assembly comprising a shift motor, a shift hub, a shift fork shaft and a shift fork, the shift fork being connected to the shift fork shaft, the shift motor being connected to the shift hub through a shift gear set, the shift hub being connected to the shift fork shaft through a shift finger, the compression spring being sleeved on the shift fork shaft, one end of the compression spring being connected to the housing, and the other end being connected to the shift fork, and the shift fork compressing the compression spring, the hybrid transmission further comprising an inverter circuit, which is electrically connected to the shift motor.

[0006] The beneficial effects of the present invention are as follows: when the parking function is implemented under normal circumstances, the shift motor operates normally, and the shift motor drives the shift hub to rotate through the shift gear set. Under the rotation of the shift hub, the shift finger moves up and down, and drives the shift fork to move synchronously, so that the synchronizer sleeve engages with the coupling ring gear on the first gear gear set, thereby implementing the parking function. When the vehicle power is off and the parking function is still required, the shift motor cannot operate normally and cannot drive the shift hub to rotate to engage the gear. At this time, the compression spring is no longer subject to the resistance of the shift motor. The shift fork is pushed by the elastic force provided by the compression spring and can move, and drives the synchronizer sleeve to engage with the coupling ring gear on the first gear gear set, thereby implementing the parking function. Through the present application, a simpler structure is adopted to implement the parking function, which not only eliminates the traditional parking gear and parking arm mechanism, simplifies the parking structure and achieves a lightweight design, but also has a compact structure, effectively reduces the production cost of the hybrid transmission and simplifies the assembly process.

[0007] Preferably, the inverter circuit includes a shift control module, which is electrically connected to the shift motor. The shift control module is used to receive an instruction signal from a vehicle controller and detect the hybrid transmission.

[0008] Preferably, the hybrid transmission further includes an output shaft, the synchronizer is located on the output shaft, the first gear gear set includes a first driving gear and a first driven gear of meshing transmission, the first driven gear is connected to the output shaft and to the combined ring gear.

[0009] Preferably, the hybrid transmission further includes a first motor, a second motor, an engine and a differential arranged in the housing, the first motor is connected to the engine through a first gear set, and the second motor is connected to the differential through a second gear set.

[0010] Preferably, an input shaft is connected to the transmission shaft of the engine, and the first driving gear is located on the input shaft.

[0011] Preferably, an output gear is provided on the output shaft, and the output gear is meshed with the main reduction gear of the differential for transmission.

[0012] Preferably, the hybrid transmission further includes a power module, and the power module is connected to the first motor and the second motor via an inverter.

[0013] Preferably, a special-shaped groove is formed on the shift hub, and one end of the shift finger away from the shift fork shaft is inserted into the special-shaped groove, and when the shift hub rotates, the shift finger slides along the special-shaped groove to drive the shift fork shaft to move up and down.

[0014] The present invention also provides a control method for a hybrid transmission, which uses the hybrid transmission described above and includes the following steps:

[0015] Powering on the inverter circuit;

[0016] The inverter circuit receives an instruction signal from the vehicle controller and drives the shift motor to work according to the instruction signal;

[0017] The shift motor drives the shift hub to rotate;

[0018] When the shift hub rotates, it drives the gear fork to move up and down, so that the gear sleeve on the synchronizer is engaged with the coupling ring gear of the first gear gear set.

[0019] Preferably, the control method further includes:

[0020] When the inverter circuit is powered off, the gear shift fork moves due to the elastic force of the compression spring, thereby driving the gear sleeve to engage with the coupling ring gear of the first gear gear set.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a hybrid transmission provided by a first embodiment of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the shift assembly provided in the first embodiment of the present invention.

[0024] Description of main component symbols:

[0025]

[0026]

[0027] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] See also Figures 1 to 2 , is a hybrid transmission in the first embodiment of the present invention, comprising a housing 10 , and a first gear gear set, a synchronizer, a shift assembly and a compression spring 14 arranged in the housing 10 .

[0032] Among them, the first gear gear set is provided with a coupling ring gear 111, and the synchronizer is provided with a gear sleeve 121. When the gear sleeve 121 is coupled with the coupling ring gear 111, the hybrid transmission will output power through the transmission path of the first gear gear set. The shift assembly is used to assist the gear sleeve 121 in coupling and / or separation with the coupling ring gear 111 to change the gear, so that the transmission can transmit different power according to different gears. The shift assembly includes a shift motor 131, a shift hub 132, a shift fork shaft 133 and a gear fork 134. The gear fork 134 is connected to the shift fork shaft 133, the shift motor 131 is connected to the shift hub 132 through the shift gear set 135, the shift hub 132 is connected to the shift fork shaft 133 through the shift finger 136, the compression spring 14 is sleeved on the shift fork shaft 133, the compression spring 14 is located between the case 10 and the gear fork 134, one end of the compression spring 14 is connected to the case 10, and the other end is connected to the gear fork 134. It should be noted that the gear fork 134 squeezes the compression spring 14 so that the compression spring 14 is continuously in a compressed state.

[0033] Specifically, when the gear needs to be changed, the shift motor 131 works, and the shift motor 131 drives the shift hub 132 to rotate through the shift gear set 135. Under the rotation of the shift hub 132, the shift finger 136 will move up and down, and drive the gear fork 134 to move synchronously, so that the synchronizer's gear sleeve 121 is combined with the coupling ring gear 111 on the first gear gear set, thereby realizing the gear change.

[0034] It is understandable that when the drive motor operates normally, the elastic force of the compression spring 14 is subject to the resistance of the shift motor 131 and is smaller than the resistance provided by the shift motor 131 , thereby not affecting the shifting of the shift assembly.

[0035] When the vehicle still needs to park after power is off, the shift motor 131 cannot function properly and cannot drive the shift hub 132 to rotate to engage a gear. At this time, the compression spring 14 is no longer subject to resistance from the shift motor 131. The shift fork 134, driven by the elastic force provided by the compression spring 14, can move and drive the gear sleeve 121 on the synchronizer to engage with the coupling ring gear 111 on the first gear gear set, thereby engaging a gear. Compared to the traditional use of a parking wheel and parking arm mechanism to achieve the parking function, this embodiment can use a simpler structure to achieve the same function. Specifically, not only can the traditional parking gear and parking arm mechanism be eliminated, simplifying the parking structure and achieving a lightweight design, but the compact structure can also effectively reduce the production cost of the hybrid transmission and simplify the assembly process.

[0036] In this embodiment, the hybrid transmission further includes a second-gear gear set, which is also provided with a coupling ring gear 111. The first-gear gear set and the second-gear gear set respectively provide a first transmission ratio and a second transmission ratio, and the first transmission ratio is greater than the second transmission ratio, thereby providing two transmission paths. Specifically, when the gear sleeve 121 on the synchronizer is coupled with the coupling ring gear 111 of the first-gear gear set, power is output at the first transmission ratio. When the gear sleeve 121 is coupled with the coupling ring gear 111 of the second-gear gear set, power is output at the second transmission ratio.

[0037] It should be noted that, in this embodiment, when parking is required, the gear sleeve 121 of the synchronizer is coupled with the coupling ring gear 111 of the first gear gear set to achieve parking.

[0038] In this embodiment, the hybrid transmission also includes an inverter circuit, which is electrically connected to the shift motor 131. The inverter circuit is configured to receive instruction signals from the vehicle controller and monitor the hybrid transmission. Specifically, the inverter circuit includes a shift control module 21, which is electrically connected to the shift motor 131. The shift control module 21 is configured to receive instruction signals from the vehicle controller and monitor the hybrid transmission.

[0039] In this embodiment, the hybrid transmission further includes an output shaft 30 , on which a synchronizer is located. The first gear gear set includes a first driving gear 112 and a first driven gear 113 that are meshed together. The first driven gear 113 is connected to the output shaft 30 and to the coupling ring gear 111 .

[0040] In this embodiment, the hybrid transmission further includes a first motor 16, a second motor 17, an engine 18 and a differential 19, which are arranged in the housing 10. The first motor 16 is connected to the engine 18 through a first gear set, and the second motor 17 is connected to the differential 19 through a second gear set. It should be noted that an input shaft 181 is connected to the transmission shaft of the engine 18, and the transmission shaft and the input shaft 181 are normally connected. The first driving gear 112 is located on the input shaft 181, that is, the first driving gear 112 is fixedly sleeved on the input shaft 181, and an output gear 31 is also fixedly sleeved on the output shaft 30, and the output gear 31 is meshed with the final reduction gear 191 of the differential 19 for transmission.

[0041] It can be understood that the first driving gear 112 is fixedly mounted on the input shaft 181, and the second gear gear set includes a second driving gear 151 and a second driven gear 152 that are meshed and transmitted. The second driving gear 151 is fixedly mounted on the input shaft 181, and the second driven gear 152 is fixedly mounted on the output shaft 30, and the second driven gear 152 is connected to the ring gear 111.

[0042] It should be noted that the first gear set includes a first motor input gear 41, a first motor output gear 42, a first motor idler gear 43 and a first motor idler gear shaft 44. The first motor 16 includes a first motor shaft. The first motor input gear 41 is located on the first motor shaft, the first motor output gear 42 is located on the input shaft 181, the first motor idler gear 43 is located on the first motor idler gear shaft 44, and the first motor idler gear 43 is engaged with the first motor input gear 41 for transmission, and is engaged with the first motor output gear 42 for transmission.

[0043] It should be noted that the second gear set includes a second motor input gear 51, a second motor output gear 52, a second motor idler gear 53 and a second motor idler gear shaft 54, and the second motor 17 includes a second motor shaft, wherein the second motor input gear 51 is located on the second motor shaft, the second motor output gear 52 and the second motor idler gear 53 are both located on the second motor idler gear shaft 54, the second motor input gear 51 is engaged with the second motor idler gear 53 for transmission, and the second motor output gear 52 is engaged with the main reduction gear 191 of the differential 19 for transmission.

[0044] In this embodiment, a special-shaped groove is formed on the shift hub 132, and the end of the shift finger 136 away from the shift fork shaft 133 is inserted into the special-shaped groove. When the shift hub 132 rotates, the shift finger 136 can slide along the special-shaped groove to drive the shift fork shaft 133 to move up and down.

[0045] In this embodiment, the hybrid transmission further includes a power module 60, which is connected to the first motor 16 and the second motor 17 via an inverter circuit. Specifically, the inverter circuit further includes an inverter module 22, and the first motor 16 and the second motor 17 are each connected to the power module 60 via the inverter module 22.

[0046] In this embodiment, it should be noted that, specifically, under the first working condition, when the vehicle needs to park normally, the vehicle controller will send a parking signal to the inverter circuit. After the inverter circuit receives the parking signal, the inverter circuit controls the shift assembly to change the corresponding gear. In this embodiment, the coupling ring gear 111 of the first gear gear set is combined with the gear sleeve 121 of the synchronizer to realize the parking function for normal parking. Specifically, the entire parking and gear shifting process is that after the inverter circuit receives the parking signal from the vehicle controller, it will drive the shift motor 131 to work, the shift motor 131 drives the shift hub 132 to rotate, and the shift hub 132 drives the shift finger 136 to slide, so that the shift finger 136 drives the gear fork 134 to move, thereby causing the gear sleeve 121 to combine with the coupling ring gear 111 of the first gear gear set, thereby realizing the parking function.

[0047] When parking and shifting gears, there may be various situations. For example, if the gear sleeve 121 is smoothly engaged with the coupling ring gear 111 of the first gear gear set, the parking gear is engaged. Then, the entire power transmission system will form a whole similar to a rigid body, and the parking function can be completed by utilizing the braking force of the engine 18 air compression reverse drag.

[0048] If there is a tooth-to-tooth situation between the gear sleeve 121 and the coupling ring gear 111 of the first gear gear set, the inverter circuit will detect that the hybrid transmission is not engaged in the corresponding gear, and then send a corresponding signal to the vehicle controller. After receiving the signal, the vehicle controller will send an instruction to the inverter circuit to control the rotation of the first motor 16, so that the first motor 16 drives the first gear gear set to rotate, and the coupling ring gear 111 of the first gear gear set will also rotate, thereby combining the gear sleeve 121 of the synchronizer with the coupling ring gear 111 of the first gear gear set to complete the parking function.

[0049] Specifically, in the second working condition, when the vehicle suddenly loses power, the hybrid transmission will also lose power. At this time, the shift motor 131 cannot drive the shift hub 132 to rotate, and the compression spring 14 is no longer subject to the resistance of the shift motor 131. The shift fork 134 is pushed by the elastic force provided by the compression spring 14 to move to drive the synchronizer sleeve 121 to engage with the coupling ring gear 111 of the first gear gear set, thereby realizing the parking function.

[0050] Specifically, under the third operating condition, when the vehicle is powered on again and the hybrid transmission is also powered on, the inverter circuit will control the shift motor 131 to drive the shift hub 132 to rotate, and the shift hub 132 will drive the gear fork 134 to move through the shift finger 136, thereby separating the synchronizer's gear sleeve 121 and the coupled ring gear 111 of the first gear gear set, and changing the gear to neutral.

[0051] Among them, if the synchronizer's gear sleeve 121 and the coupling ring gear 111 of the first gear gear set can be separated smoothly, at this time, the shift motor 131 will generate resistance to prevent the compression spring 14 from pushing the gear fork 134 to move, thereby preventing the gear sleeve 121 from being combined with the coupling ring gear 111 of the first gear gear set, thereby preventing accidental gear shifting.

[0052] If the vehicle is on a slope, the gear sleeve 121 and the coupled ring gear 111 of the first gear gear set cannot be separated smoothly. The first motor 16 is controlled to work by the inverter circuit, and the first motor 16 provides speed and torque to separate the gear sleeve 121 and the coupled ring gear 111 of the first gear gear set smoothly.

[0053] In specific implementation, when the parking function is realized under normal circumstances, the inverter circuit receives the parking signal from the vehicle controller and controls the shift motor 131 to start working. The shift motor 131 drives the shift hub 132 to rotate through the shift gear set 135. Under the rotation of the shift hub 132, the shift finger 136 will move up and down, and drive the gear fork 134 to move synchronously, so that the synchronizer sleeve 121 is engaged with the coupling ring gear 111 on the first gear gear set, thereby realizing the parking function. When the parking function still needs to be realized after the vehicle power is cut off, the shift motor 131 cannot work normally and cannot drive the shift hub 132 to rotate to engage the gear. At this time, the compression spring 14 is no longer subject to the resistance of the shift motor 131. The shift fork 134 can move under the elastic force provided by the compression spring 14, and drives the gear sleeve 121 on the synchronizer to engage with the coupling ring gear 111 on the first gear gear set, thereby realizing the parking function. Through this application, a simpler structure is adopted to realize the parking function, which not only eliminates the traditional parking gear and parking arm mechanism, simplifies the parking structure and realizes lightweight design, but also the structure is compact, which can effectively reduce the production cost of the hybrid transmission and simplify the assembly process.

[0054] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but it does not mean that the hybrid transmission of this application has only the above-mentioned implementation process. On the contrary, as long as the hybrid transmission of this application can be implemented, it can be included in the feasible implementation plan of this application.

[0055] A second embodiment of the present invention further provides a method for controlling a hybrid transmission, which uses the hybrid transmission in the first embodiment, and includes the following steps:

[0056] The inverter circuit is powered on;

[0057] The inverter circuit receives the instruction signal from the vehicle controller and drives the shift motor 131 to work according to the instruction signal;

[0058] The shift motor 131 drives the shift hub 132 to rotate;

[0059] When the shift hub 132 rotates, the shift finger 136 on the fork shaft 133 slides along the special-shaped groove of the shift hub 132 to drive the shift fork 134 to move, so that the gear sleeve 121 on the synchronizer is engaged with the coupling ring gear of the first gear gear set or the second gear gear set.

[0060] The control method of the hybrid transmission also includes:

[0061] When the inverter circuit is powered off, the shift fork 134 moves due to the elastic force of the compression spring 14 , thereby driving the gear sleeve 121 to engage with the coupling ring gear of the first gear set or the second gear set.

[0062] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A hybrid transmission, comprising a housing, a first gear set and a synchronizer disposed in the housing, wherein the first gear set is provided with a coupling ring gear, and the synchronizer is provided with a gear sleeve, characterized in that: The hybrid transmission further includes a shift assembly and a compression spring disposed in the housing, the shift assembly being used to change gears, the shift assembly including a shift motor, a shift hub, a shift fork shaft and a shift fork, the shift fork being connected to the shift fork shaft, the shift motor being connected to the shift hub via a shift gear set, the shift hub being connected to the shift fork shaft via a shift finger, the compression spring being sleeved on the shift fork shaft, one end of the compression spring being connected to the housing, the other end being connected to the shift fork, and the shift fork compressing the compression spring, the hybrid transmission further includes an inverter circuit electrically connected to the shift motor; the hybrid transmission further includes a first motor and an engine disposed in the housing, the first motor being connected to the engine via a first gear set, an input shaft being connected to a transmission shaft of the engine, and a first driving gear of the first shift gear set being located on the input shaft; When the gear sleeve and the coupling ring gear are aligned, the inverter circuit can detect that the hybrid transmission is not engaged in a corresponding gear, and the inverter circuit sends a corresponding signal to the vehicle controller. The vehicle controller sends an instruction to the inverter circuit to control the rotation of the first motor, so that the first motor drives the coupling ring gear to rotate, thereby coupling the gear sleeve and the coupling ring gear and completing the parking operation. When the hybrid transmission is powered off, the compression spring provides elastic force to push the shift fork, so that the shift fork can move and drive the gear sleeve to engage with the coupling gear ring to complete the parking operation.

2. The hybrid transmission according to claim 1, characterized in that: The inverter circuit includes a shift control module, which is electrically connected to the shift motor. The shift control module is used to receive an instruction signal from the vehicle controller and detect the hybrid transmission.

3. The hybrid transmission according to claim 1, characterized in that: The hybrid transmission also includes an output shaft, the synchronizer is located on the output shaft, the first gear gear set includes a first driving gear and a first driven gear that are meshed and driven, and the first driven gear is connected to the output shaft and to the combined ring gear.

4. The hybrid transmission according to claim 3, characterized in that: The hybrid transmission further includes a second motor and a differential disposed within the housing, wherein the second motor is connected to the differential via a second gear set.

5. The hybrid transmission according to claim 4, characterized in that: An output gear is provided on the output shaft, and the output gear is meshed with the main reduction gear of the differential for transmission.

6. The hybrid transmission according to claim 4, characterized in that: The hybrid transmission further includes a power module, which is connected to the first motor and the second motor via an inverter.

7. The hybrid transmission according to claim 1, characterized in that: The shift hub is provided with a special-shaped groove, and one end of the shift finger away from the shift fork shaft is inserted into the special-shaped groove. When the shift hub rotates, the shift finger slides along the special-shaped groove to drive the shift fork shaft to move up and down.

8. A control method for a hybrid transmission, characterized in that: The hybrid transmission according to any one of claims 1 to 7 comprises the following steps: Powering on the inverter circuit; The inverter circuit receives an instruction signal from the vehicle controller and drives the shift motor to work according to the instruction signal; The shift motor drives the shift hub to rotate; When the shift hub rotates, it drives the gear fork to move up and down, so that the gear sleeve on the synchronizer is engaged with the coupling ring gear of the first gear gear set.

9. The control method of the hybrid transmission according to claim 8, characterized in that: The control method further includes: When the inverter circuit is powered off, the gear shift fork moves due to the elastic force of the compression spring, thereby driving the gear sleeve to engage with the coupling ring gear of the first gear gear set.

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