Power switching system and automobile

Abstract

The invention discloses a power switching system and an automobile. The power switching system comprises a motor shaft capable of being driven by a motor driving unit, a gear shifting cam ring capable of being driven by the motor shaft to rotate, the gear shifting cam ring comprises a first inclined face and a clutch cam ring, and the clutch cam ring comprises a second inclined face. The clutch cam ring is provided with a first inclined plane and a second inclined plane, the first inclined plane can be matched with the second inclined plane, when the gear shifting cam ring rotates in the first direction, the first inclined plane can apply acting force to the second inclined plane so that the clutch cam ring can move away from the gear shifting cam ring in the axial direction, and the parking cam can be driven by a motor shaft to rotate. The parking cam can drive the parking pawl to swing around the pawl shaft so as to lock the parking gear. According to the power switching system, the arrangement of the power switching system can be optimized.

Description

Technical Field

[0001] The present application relates to the field of automobiles, and more particularly, to a power switching system and an automobile equipped with such a power switching system. Background Art

[0002] In hybrid electric vehicles and pure electric vehicles, the power switching device is an important part of controlling the power output of the electric drive transmission system. A high-performance power switching device can quickly and reliably transmit and interrupt power as required to meet the requirements of hybrid and electric applications.

[0003] Currently, the power switching devices of hybrid electric vehicles and pure electric vehicles usually use a hydraulic module to drive a multi-plate clutch, and the parking mechanism usually uses a motor to drive. That is to say, the operations of the parking mechanism and the shifting mechanism are driven by different power sources and controlled separately. This arrangement makes the weight and volume of the power switching device relatively large, and the control is also more complex. Summary of the Invention

[0004] The main technical problem to be solved by the present application is how to optimize the layout of the power switching system.

[0005] To solve the above technical problem, on the one hand, the present application provides a power switching system, which includes:

[0006] A motor shaft that can be driven by a motor drive unit,

[0007] A shift cam ring that can be driven by the motor shaft to rotate, and the shift cam ring includes a first inclined surface,

[0008] A clutch cam ring that includes a second inclined surface, and the first inclined surface can cooperate with the second inclined surface. When the shift cam ring rotates in a first direction, the first inclined surface can apply a force to the second inclined surface so that the clutch cam ring moves axially away from the shift cam ring.

[0009] A parking cam that can be driven by the motor shaft to rotate, and the parking cam can drive a parking pawl to swing around a pawl shaft to lock a parking gear.

[0010] According to the power switching system proposed by one aspect of the present application,

[0011] When the motor shaft rotates in a second direction, the shift cam ring rotates in a first direction, and the parking cam can drive the parking pawl to swing around the pawl shaft to release the parking gear;

[0012] When the motor shaft rotates in a direction opposite to the second direction, the shift cam ring rotates in a direction opposite to the first direction, and the parking cam can drive the parking pawl to swing around the pawl shaft to lock the parking gear.

[0013] For the power switching system proposed according to one aspect of the present application, the shift cam ring is fixed in the axial position, and the clutch cam ring can move axially.

[0014] For the power switching system proposed according to one aspect of the present application, when the clutch cam ring moves axially away from the shift cam ring by a certain distance, the clutch is engaged.

[0015] For the power switching system proposed according to one aspect of the present application, at least two first inclined surfaces are symmetrically provided in a direction perpendicular to the axial direction of the shift cam ring, and at least two second inclined surfaces are correspondingly provided in a direction perpendicular to the axial direction of the clutch cam ring.

[0016] For the power switching system proposed according to one aspect of the present application, the power switching system includes a parking shift finger, the parking shift finger is rotationally and fixedly connected to the motor shaft, the parking cam can rotate relative to the motor shaft, and the motor shaft drives the parking cam to rotate through the parking shift finger.

[0017] For the power switching system proposed according to one aspect of the present application, a cam return spring is provided between the parking shift finger and the parking cam.

[0018] For the power switching system proposed according to one aspect of the present application, the power switching system includes a switching valve, the switching valve can be driven by the motor shaft to rotate, and the switching valve is used to control the opening and closing of the clutch lubricating oil circuit.

[0019] For the power switching system proposed according to one aspect of the present application, when the clutch is engaged, the switching valve opens the clutch lubricating oil circuit, and when the clutch is not engaged, the switching valve closes the clutch lubricating oil circuit.

[0020] On the other hand, the present application provides an automobile, which includes the power switching system described in any of the above aspects.

[0021] According to the technical solution of the present application, a motor shaft, a shift cam ring, a clutch cam ring, a parking cam and their cooperation modes are provided. Through a single motor shaft, the clutch engagement and parking can be controlled simultaneously, thereby optimizing the layout of the power switching system. Description of the Drawings

[0022] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the protection scope of the present application. Among them:

[0023] Figure 1 Schematically shows a power switching system proposed according to an embodiment of the present application;

[0024] Figure 2 Schematically shows Figure 1 a part of the power switching system in

[0025] Figure 3 Schematically shows Figure 1 the mating relationship between the shift cam ring and the clutch cam ring in the power switching system in

[0026] Figure 4 Schematically shows Figure 1 the shift cam ring in the power switching system in

[0027] Figure 5 Schematically shows Figure 1 the clutch cam ring in the power switching system in

[0028] Figure 6 Schematically shows three mating relationships between the first inclined surface and the second inclined surface, corresponding to parking, neutral, and in-gear from left to right;

[0029] Figure 7 Schematically shows Figure 1 the switching valve in the power switching system in , where the switching valve is in the open state;

[0030] Figure 8 Schematically shows Figure 1 the switching valve in the power switching system in , where the switching valve is in the closed state. Detailed implementation manners

[0031] Embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present application.

[0032] According to a specific implementation manner of the present application, the power switching system includes:

[0033] a motor shaft that can be driven by a motor drive unit,

[0034] a shift cam ring that can be driven by the motor shaft to rotate, and the shift cam ring includes a first inclined surface,

[0035] A clutch cam ring, the clutch cam ring includes a second inclined surface, the first inclined surface can cooperate with the second inclined surface, when the shift cam ring rotates along a first direction, the first inclined surface can apply a force to the second inclined surface so that the clutch cam ring moves axially away from the shift cam ring, and the first inclined surface and the second inclined surface can be straight lines or curves.

[0036] A parking cam, the parking cam can be driven by a motor shaft to rotate, and the parking cam can drive a parking pawl to swing around a pawl shaft to release and / or lock a parking gear.

[0037] Further, it can be set that when the motor shaft rotates along a second direction, the shift cam ring rotates along the first direction to engage the clutch, and the parking cam can drive the parking pawl to swing around the pawl shaft to release the parking gear. When the motor shaft rotates in a direction opposite to the second direction, the shift cam ring rotates in a direction opposite to the first direction to disengage the clutch, and the parking cam can drive the parking pawl to swing around the pawl shaft to lock the parking gear. For example, when the parking pawl extends between two adjacent teeth of the parking gear, the parking gear is locked.

[0038] It can be set that the shift cam ring and the motor shaft are equipped with spur gears in constant mesh, and the motor shaft is rotationally fixed to the motor drive unit. Thus, the rotation angle of the shift cam ring / parking cam can be controlled by the motor drive unit to switch the power switching system to different states. For example, when the motor drive unit / motor shaft is at different rotation angles, the power switching system is in the parking, neutral, and in-gear states respectively. For example, when the line of sight is parallel to the axis, the first direction is the clockwise direction, and the second direction is the counterclockwise direction.

[0039] It can be set that the position of the shift cam ring in the axial direction is fixed, and the clutch cam ring can move axially. Thus, when the shift cam ring rotates along the first direction, due to the contact between the first inclined surface and the second inclined surface, the first inclined surface applies a downward force to the second inclined surface so that the clutch cam ring moves downward axially, away from the shift cam ring.

[0040] Further, when the clutch cam ring moves axially away from the shift cam ring by a certain distance, the clutch is engaged. For example, the clutch cam ring moves downward by a certain distance to compress the friction plates of the clutch, so that the clutch enters the engaged state.

[0041] Exemplarily, at least two first inclined surfaces are symmetrically provided in a direction perpendicular to the axial direction of the shift cam ring, and at least two second inclined surfaces are correspondingly provided in a direction perpendicular to the axial direction of the clutch cam ring, that is, the number and shape of the second inclined surfaces correspond to those of the first inclined surfaces. The plurality of first inclined surfaces may extend to cover the entire circumference.

[0042] Further, the power switching system includes a parking shift finger, the parking shift finger is rotationally and fixedly connected to the motor shaft, the parking cam can rotate relative to the motor shaft, and the motor shaft drives the parking cam to rotate through the parking shift finger. A cam return spring may be provided between the parking shift finger and the parking cam.

[0043] It may also be arranged that the power switching system includes a switching valve, the switching valve can be driven by the motor shaft to rotate, and the switching valve is used to control the opening and closing of the clutch lubricating oil path. Specifically, when the clutch is engaged, the switching valve opens the clutch lubricating oil path, and when the clutch is not engaged, the switching valve closes the clutch lubricating oil path.

[0044] Figures 1 - 8 Schematically shows a power switching system proposed according to an embodiment of the present application. As can be seen from the figure, the power switching system includes a motor drive unit 1, a front bearing 2, a parking cam 3, a cam return spring 4, a fixing pin 5, a parking shift finger 6, a motor shaft

[0045] 7, a rear shaft 8, a shift cam ring 9, a clutch cam ring 10, a clutch 11, a transmission gear 12, a parking gear 13, a pawl shaft fixing plate 14, a pawl spring 15, a pawl shaft 16, a parking pawl 17, and a switching valve 18.

[0046] The motor drive unit 1 is a power source, and the front bearing 2 and the rear bearing 8 play a supporting role to support the motor shaft 7. The cam return spring 4 plays a role in storing energy. When the parking cam 3 is blocked (for example, when the parking pawl 17 contacts the tooth top of the parking gear 13), the motor shaft 7 continues to rotate to drive the cam return spring 4 to move, without affecting the movement of the motor shaft 7 and the parking shift finger 6; when the cam 3 is not blocked, the cam return spring 4 releases and pushes the cam 3 to move, so that the parking pawl 17 contacts the tooth root of the parking gear 13. When the clutch 11 is engaged, power is transmitted, and when the clutch 11 is not engaged, power is not transmitted.

[0047] The transmission gear 12 is a gear for a gear position. Power is transmitted to the transmission gear 12. When the clutch 11 is engaged, the transmission gear 12 is connected to the entire shaft, and power is transmitted to the shaft through the transmission gear 12. When the clutch is not engaged, power is transmitted to the transmission gear 12, and the transmission gear 12 idles, and power cannot be transmitted to the shaft. The pawl shaft fixing plate 14 serves to fix the pawl shaft 16.

[0048] The motor 1 is connected to the motor shaft 7 by a spline, and the parking shift finger 6 is connected to the motor shaft 7 by a fixing pin 5. The motor 1 drives the motor shaft 7 to rotate, the motor shaft 7 drives the parking shift finger 6 and the parking cam 3 to rotate, and the parking cam 3 pushes the parking pawl 17 to rotate around the pawl shaft 16 to lock the parking gear 13, realizing the parking function. The pawl spring 15 realizes the reset of the parking pawl 17.

[0049] The shift cam ring 9 is integrated with a gear. As the motor shaft 7 rotates, the gears mesh, driving the shift cam ring 9 to rotate. Refer to Figures 3 - 5 As shown, both the shift cam ring 9 and the clutch cam ring 10 have bevel features. As the shift cam ring 9 rotates, through the action of the bevel, the clutch cam ring 10 presses the clutch, realizing the shifting function.

[0050] The cam bevels at the three positions of parking, neutral, and in-gear cooperate as Figure 6 shown. The motor drive unit 1 drives the motor shaft 7 to rotate. The motor shaft 7 drives the shift cam ring 9 to rotate through gear reduction. The bevel on the shift cam ring 9 presses the bevel of the clutch cam ring 10. As the shift cam ring 9 rotates, the position of the pressed bevel changes, realizing the position change of the clutch cam ring 10. Through the cooperation of the bevels corresponding to different angular positions of the motor shaft 7, the same motor can orderly control parking and shifting.

[0051] The three positions of neutral, parking, and in-gear are realized by different pressing amounts of the clutch cam ring 10. Specifically, the neutral position is the default state. When the motor rotates counterclockwise, it drives the cam ring 9 to rotate, and the cam ring 9 further affects the position of the clutch cam ring 10, pressing the clutch disc to realize the engagement of the clutch, which is the in-gear state. When the motor rotates in the reverse direction, it drives the parking cam 3 to rotate, and then pushes the parking pawl 17 to lock the parking gear 13, realizing the parking function; at the same time, the motor shaft 7 drives the cam ring 9 to rotate in the reverse direction, and the cam ring 9 further affects the position of the clutch cam ring 10, and the clutch disc is not pressed, belonging to the disengaged state (including the neutral and parking states).

[0052] The switching valve 18 is composed of a gear and a shaft with holes. The motor shaft 7 drives the switching valve gear to rotate. When in the in-gear position, the switching valve opens, and lubricating oil can enter the clutch lubricating oil path to lubricate the clutch, as Figure 7 shown. When in the neutral and parking positions, the switching valve is closed, and lubricating oil cannot enter the clutch lubricating oil path, as Figure 8 shown, thereby reducing the drag loss during the rotation of the clutch, lubricating as needed, and improving efficiency. When the oil enters between the clutch discs, it will increase the frictional loss. Without oil supply, the loss can be reduced, making it more energy-efficient.

[0053] A round hole is opened on the shaft of the switching valve 18, and an oil passage is also opened on the housing that mates with the shaft. When the hole on the switching valve is exactly aligned with the oil passage on the housing, oil can flow from one end of the housing oil passage through the hole on the switching valve to the other end oil passage of the housing for lubrication.

[0054] When the switch shaft is turned to the neutral and parking gears, and the hole on the switching valve is not aligned with the oil passage on the housing, oil will not flow from one end of the housing oil passage through the hole on the switching valve to the other end oil passage of the housing, and there will be no lubrication. By adding a clutch lubrication switching valve, the clutch lubricating oil circuit can be opened and closed as needed, achieving good lubrication when the clutch is working and reducing drag loss when the clutch is not working.

[0055] In addition, the parking function can be removed, retaining the neutral and in-gear positions, with the same structure used. Other forms of clutches can also be applicable.

[0056] The power switching system proposed according to this embodiment is compactly arranged and has good reliability. The parking mechanism and the shifting mechanism share a single motor, reducing costs. Through the coordinated action of the conversion mechanism, it can be applied to traditional transmissions, hybrid HEV and PHEV DHT, and multi-speed pure electric DU. In addition, the motor-driven clutch composed of multiple friction plates is realized through the mating of the shifting cam ring and the clutch cam ring with inclined surfaces, resulting in smooth power switching. The three positions of parking, neutral, and in-gear are achieved through the mating of inclined surfaces. By coordinating the inclined surfaces corresponding to different motor shaft angular positions, the same motor can be used to orderly control parking and shifting.

[0057] This application also includes an automobile equipped with the power switching system of any one or more of the foregoing embodiments. The technical features and technical effects thereof are accordingly as described above, and thus will not be elaborated herein.

Claims

1. A power switching system, characterized in that, The power switching system includes: a motor shaft that can be driven by a motor drive unit, a shift cam ring that can be driven by the motor shaft to rotate, the shift cam ring including a first inclined surface, a clutch cam ring that includes a second inclined surface, the first inclined surface being capable of cooperating with the second inclined surface, and when the shift cam ring rotates in a first direction, the first inclined surface can apply a force to the second inclined surface such that the clutch cam ring moves axially away from the shift cam ring, a parking cam that can be driven by the motor shaft to rotate, and the parking cam can drive a parking pawl to swing around a pawl shaft to lock a parking gear.

2. The power switching system according to claim 1, wherein when the motor shaft rotates in a second direction, the shift cam ring rotates in a first direction, and the parking cam can drive the parking pawl to swing around the pawl shaft to release the parking gear; when the motor shaft rotates in a direction opposite to the second direction, the shift cam ring rotates in a direction opposite to the first direction, and the parking cam can drive the parking pawl to swing around the pawl shaft to lock the parking gear.

3. The power switching system according to claim 1, wherein The position of the shift cam ring in the axial direction is fixed, and the clutch cam ring can move axially.

4. The power switching system according to claim 1, wherein When the clutch cam ring moves axially away from the shift cam ring by a certain distance, the clutch is engaged.

5. The power switching system according to claim 1, characterized in that, At least two first inclined surfaces are symmetrically provided in a direction perpendicular to the axial direction of the shift cam ring, and at least two second inclined surfaces are correspondingly provided in a direction perpendicular to the axial direction of the clutch cam ring.

6. The power switching system according to claim 1, wherein The power switching system includes a parking shift finger that is rotationally and fixedly connected to the motor shaft, the parking cam can rotate relative to the motor shaft, and the motor shaft drives the parking cam to rotate through the parking shift finger.

7. The power switching system according to claim 6, wherein A cam return spring is provided between the parking shift finger and the parking cam.

8. The power switching system according to claim 4, wherein The power switching system includes a switching valve that can be driven by the motor shaft to rotate, and the switching valve is used to control the opening and closing of a clutch lubricating oil passage.

9. The power switching system according to claim 8, wherein When the clutch is engaged, the switching valve opens the clutch lubricating oil passage, and when the clutch is not engaged, the switching valve closes the clutch lubricating oil passage.

10. A vehicle, characterized in that, It includes the power switching system according to any one of claims 1 to 9.

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