Ball ramp electromagnetic clutch and hybrid vehicle

Abstract

The utility model relates to a ball ramp electromagnetic clutch. The ball ramp electromagnetic clutch comprises a power shaft; the power gear is rotatably arranged on the power shaft; the outer hub assembly is connected with the power gear and synchronously rotates along with the power gear; the inner hub assembly is arranged on the power shaft in a sleeving manner and synchronously rotates along with the power shaft; the ball ramp device is arranged on the power shaft in a sleeving manner through a one-way bearing, and the ball ramp device is used for connecting or separating the outer hub assembly and the inner hub assembly; when the outer hub assembly is connected with the inner hub assembly, the one-way bearing is used for transmitting power of the power gear to the power shaft in a one-way mode. The problem that a ball ramp electromagnetic clutch cannot be used for the hybrid vehicle can be effectively solved, the combination state of the clutch cannot be affected when the vehicle accelerates and decelerates, and the risk that the clutch is disengaged in the process of emergency braking and energy recovery of the hybrid vehicle is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the clutch technical field, in particular to a kind of ball ramp electromagnetic clutch and hybrid vehicle. BACKGROUND

[0002] Ball ramp electromagnetic clutch can utilize a pair of opposite circular plates to define opposite symmetrical inclined grooves, to amplify electromagnetic force and compress clutch plate, to realize the synchronization of inner and outer hub of clutch and power transmission. The advantage of ball ramp drive is that electromagnetic clutch is not as the main driving force, just as an auxiliary actuator, reduces the power consumption, by controlling the on-off of electromagnet can control the combination and disconnection of clutch. However, due to the structural limitation of ball ramp, the electromagnetic clutch requires the vehicle to drive one side faster than the other side, otherwise the electromagnetic clutch will be disconnected, which is not suitable for hybrid vehicles that require simple on-off of clutch. In the process of hybrid vehicle emergency braking and hybrid vehicle energy recovery, there is a risk of clutch disconnection. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a kind of ball ramp electromagnetic clutch and hybrid vehicle to improve the problem of existing ball ramp electromagnetic clutch in the process of hybrid vehicle emergency braking and energy recovery.

[0004] The present application provides a kind of ball ramp electromagnetic clutch, the ball ramp electromagnetic clutch includes:

[0005] Power shaft;

[0006] Power gear, which is rotatably arranged on the power shaft;

[0007] Outer hub assembly, which is connected with the power gear and rotates synchronously with the power gear;

[0008] Inner hub assembly, which is sleeved on the power shaft and rotates synchronously with the power shaft;

[0009] Ball ramp device, which is sleeved on the power shaft through one-way bearing, the ball ramp device is used to connect or separate the outer hub assembly and the inner hub assembly;When the outer hub assembly is connected with the inner hub assembly, the one-way bearing is used to one-way transmit the power of the power gear to the power shaft.

[0010] In one embodiment, the one-way bearing is a one-way needle bearing.

[0011] In one embodiment, the ball ramp device includes ball cam pressure disc and fixed pressure disc, the ball cam pressure disc moves relative to the fixed pressure disc to connect or separate the outer hub assembly and the inner hub assembly.

[0012] In one of the embodiments, the outer hub assembly comprises a first brake pad, the inner hub assembly comprises a second brake pad; when the outer hub assembly is connected with the inner hub assembly, the ball cam pressing disc moves relative to the fixed disc and abuts the first brake pad with the second brake pad.

[0013] In one of the embodiments, the inner hub assembly further comprises a support pad, when the ball cam pressing disc abuts the first brake pad with the second brake pad, the ball cam pressing disc abuts the first brake pad and the second brake pad on the support pad.

[0014] In one of the embodiments, the ball ramp electromagnetic clutch further comprises an electromagnetic device, the electromagnetic device enables the ball cam pressing disc to move relative to the fixed disc.

[0015] In one of the embodiments, the electromagnetic device comprises a clutch pressing disc and an electromagnetic coil, the clutch pressing disc is slidably connected with the outer hub assembly and rotates synchronously, the electromagnetic coil is used for magnetically attracting the clutch pressing disc, so that the clutch pressing disc moves close to the fixed disc and abuts the fixed disc.

[0016] In one of the embodiments, the ball ramp electromagnetic clutch further comprises a first elastic return member, the first elastic return member is used for returning the clutch pressing disc.

[0017] In one of the embodiments, the ball ramp electromagnetic clutch further comprises a second elastic return member, the second elastic return member is used for returning the ball cam pressing disc.

[0018] In one of the embodiments, the power shaft is sleeved with a deep groove ball bearing at both ends, the two deep groove ball bearings are used for axially positioning the power shaft.

[0019] The application can effectively solve the problem that the ball ramp electromagnetic clutch cannot be used in hybrid vehicles by rotatably arranging the ball ramp device on the power shaft through the one-way bearing, so that the ball ramp electromagnetic clutch can meet the simple on-off requirement of the clutch in the hybrid vehicle, so that the vehicle will not affect the combination state of the clutch when accelerating or decelerating, and the risk of disconnection of the clutch in the process of emergency braking and energy recovery of the hybrid vehicle is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The cross-sectional view of the ball ramp electromagnetic clutch provided by the embodiment of the application is provided;

[0021] Figure 2 The exploded view of the ball ramp electromagnetic clutch provided by the embodiment of the application is provided;

[0022] Figure 3 A schematic view of a ball ramp electromagnetic clutch in a hybrid mode according to an embodiment of the present application is shown in FIG. 1.

[0023] Figure 4 A schematic view of a ball ramp electromagnetic clutch in an electric mode according to an embodiment of the present application is shown in FIG. 2.

[0024] The figure reference: 100, power shaft; 110, deep groove ball bearing; 200, power gear; 210, needle bearing; 300, outer hub assembly; 310, first brake piece; 320, outer hub body; 400, inner hub assembly; 410, second brake piece; 420, inner hub body; 421, elastic ring; 430, support piece; 500, ball ramp device; 510, ball cam pressure plate; 520, fixed pressure plate; 530, steel ball; 600, electromagnetic device; 610, clutch pressure plate; 620, electromagnetic coil; 630, coil support; 700, one-way bearing; 800, first elastic return member; 810, limit ring; 900, second elastic return member; 101, housing; 102, bearing chamber. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0026] It should be noted that the diagrams provided in the embodiments only illustrate the basic concept of the present application in a schematic manner.

[0027] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that people skilled in the art can understand and read, and are not used to limit the limiting conditions of the implementation of the present application. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the functions and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0028] The orientations or positional relationships indicated by the terms such as "upper", "lower", "left", "right", "intermediate", "vertical", "horizontal", "horizontal", "inner", "outer", "radial", "circumferential", etc. in the present specification are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for description purposes and cannot be understood as indicating or implying relative importance.

[0029] The embodiment of the present application provides a ball ramp electromagnetic clutch, which comprises Figures 1 to 4 As shown in the figure, the ball ramp electromagnetic clutch comprises:

[0030] a power shaft 100;

[0031] a power gear 200 rotatably arranged on the power shaft 100;

[0032] an outer hub assembly 300 connected with the power gear 200 and synchronously rotating with the power gear 200;

[0033] an inner hub assembly 400 sleeved on the power shaft 100 and synchronously rotating with the power shaft 100;

[0034] a ball ramp device 500 sleeved on the power shaft 100 through a one-way bearing 700, the ball ramp device 500 being used for connecting or separating the outer hub assembly 300 and the inner hub assembly 400, and the one-way bearing 700 being used for unidirectionally transmitting power of the power gear 200 to the power shaft 100 when the outer hub assembly 300 is connected with the inner hub assembly 400.

[0035] As shown in the figure, Figure 1 and Figure 2 in the embodiment, the power shaft 100 and the power gear 200 can be used for power transmission in a hybrid vehicle, wherein the power shaft 100 can be an intermediate shaft of a transmission shaft system, and the power gear 200 can be an intermediate shaft gear. The power gear 200 can be sleeved on the power shaft 100 and rotatably arranged on the power shaft 100.

[0036] As shown in the figure, Figure 1 and Figure 3 the working mode of the hybrid vehicle can comprise a hybrid mode, in the hybrid mode, power can be input by the power gear 200 and further transmitted to the power shaft 100, so as to realize power coupling of an engine and an electric motor. The transmission process can be realized through the outer hub assembly 300 and the inner hub assembly 400. The outer hub assembly 300 is connected with the power gear 200, and the outer hub assembly 300 synchronously rotates with the power gear 200. The inner hub assembly 400 is sleeved on the power shaft 100, and the inner hub assembly 400 synchronously rotates with the power shaft 100. When the hybrid vehicle is in a range extending hybrid mode and power is input by the power gear 200, the outer hub assembly 300 can be connected with the inner hub assembly 400, so that power of the power gear 200 is sequentially transmitted to the power shaft 100 through the outer hub assembly 300 and the inner hub assembly 400.

[0037] In the embodiment, the connection of the outer hub assembly 300 and the inner hub assembly 400 can be realized by the ball ramp device 500, which can connect or disconnect the outer hub assembly 300 and the inner hub assembly 400; when the hybrid vehicle is in the hybrid mode, the ball ramp device 500 connects the outer hub assembly 300 and the inner hub assembly 400.

[0038] It should be noted that the working modes of the hybrid vehicle can include the pure electric mode in addition to the hybrid mode.

[0039] As shown in Figure 1 and Figure 4 , when the hybrid vehicle is in the pure electric mode, power can be input by the power shaft 100, and the ball ramp device 500 can disconnect the outer hub assembly 300 and the inner hub assembly 400. At this time, the power of the power shaft 100 can only be transmitted to the inner hub assembly 400 and cannot be further transmitted, so the power gear 200 and the outer hub assembly 300 do not rotate, and only the inner hub assembly 400 idles with the power shaft 100.

[0040] In the embodiment, it can be seen that when the hybrid vehicle is in the hybrid mode, the one-way bearing 700 arranged between the ball ramp device 500 and the power shaft 100 can ensure that the power of the power shaft 100 cannot be reversely driven to the power gear 200, and only the power of the power gear 200 can be driven to the power shaft 100. Therefore, during the acceleration and deceleration of the hybrid vehicle in the hybrid mode, the outer hub assembly 300 and the inner hub assembly 400 will not be disconnected because of the reverse speed difference between the power shaft 100 and the power gear 200.

[0041] In summary, the one-way bearing 700 rotatably arranges the ball ramp device 500 on the power shaft 100, which can effectively solve the problem that the ball ramp electromagnetic clutch cannot be used in the hybrid vehicle, so that the ball ramp electromagnetic clutch can meet the simple on-off requirement of the clutch in the hybrid vehicle, so that the vehicle will not affect the combination state of the clutch during acceleration and deceleration, and the risk of disconnection of the clutch during the process of emergency braking and energy recovery of the hybrid vehicle is avoided.

[0042] Specifically, the one-way bearing 700 is a one-way needle bearing 210.

[0043] As shown in Figure 1 and Figure 2As shown, in this embodiment, the one-way bearing 700 can preferably be a one-way needle roller bearing 210, which has a high load-bearing capacity and can withstand large radial and axial loads, meeting the requirement of preventing reverse power transmission in the range-extended hybrid mode of this application. Simultaneously, it has a low coefficient of friction, ensuring the smooth rotation of the constant pressure plate 520 on the power shaft 100. Furthermore, it also features a compact structure, occupying less space, which is suitable for installation environments with limited space between the power shaft 100 and the ball bearing ramp device 500.

[0044] More specifically, the ball bearing ramp device 500 includes a ball cam pressure plate 510 and a fixed pressure plate 520, the ball cam pressure plate 510 being movable relative to the fixed pressure plate 520 to connect or disconnect the outer hub assembly 300 from the inner hub assembly 400.

[0045] like Figure 1 and Figure 2 As shown in this embodiment, the ball bearing ramp device 500 may specifically include a fixed pressure plate 520, a ball cam pressure plate 510, and steel balls 530. The fixed pressure plate 520 is fixed in position along the axial direction of the power shaft 100, while the ball cam pressure plate 510 is connected to the fixed pressure plate 520 via the steel balls 530. Simultaneously, the fixed pressure plate 520 and the ball cam pressure plate 510 may also be provided with climbing structures, such as ball bearing grooves, for cooperating with the steel balls 530. When there is a speed difference between the fixed pressure plate 520 and the ball cam pressure plate 510, the ball cam pressure plate 510 can climb under the action of the steel balls 530 and the climbing structure, that is, the ball cam pressure plate 510 moves away from the fixed pressure plate 520 along the axial direction of the power shaft 100. When both the fixed pressure plate 520 and the ball cam pressure plate 510 stop rotating, the ball cam pressure plate 510 can reset under the action of the driving force, that is, move closer to the fixed pressure plate 520 along the axial direction of the power shaft 100.

[0046] like Figure 3 As shown, in this embodiment, when the ball cam pressure plate 510 moves away from the fixed pressure plate 520, the ball cam pressure plate 510 connects the outer hub assembly 300 and the inner hub assembly 400. At this time, the ball ramp electromagnetic clutch can be applied to the hybrid mode of the hybrid vehicle; in the hybrid mode, when power is input by the power gear 200, the power of the power gear 200 can be transmitted to the power shaft 100 in sequence through the outer hub assembly 300 and the inner hub assembly 400.

[0047] like Figure 4As shown, when the ball cam pressure plate 510 moves axially along the power shaft 100 towards the fixed pressure plate 520 and fully resets, the outer hub assembly 300 separates from the inner hub assembly 400. At this time, the ball ramp electromagnetic clutch can be applied to the pure electric mode of the hybrid vehicle; in pure electric mode, when power is input from the power shaft 100, the power of the power shaft 100 can only be transmitted to the inner hub assembly 400 and will not be transmitted further, and the power shaft 100 drives the inner hub assembly 400 to idle.

[0048] It is understood that this embodiment, by reasonably setting the structural composition of the ball bearing ramp device 500, facilitates the connection between the outer hub assembly 300 and the inner hub assembly 400, so as to ensure that the power of the power gear 200 can be smoothly transmitted to the power shaft 100 in the hybrid mode.

[0049] More specifically, the outer hub assembly 300 includes a first brake pad 310, and the inner hub assembly 400 includes a second brake pad 410; when the outer hub assembly 300 is connected to the inner hub assembly 400, the ball cam pressure plate 510 moves relative to the fixed pressure plate 520 and abuts the first brake pad 310 against the second brake pad 410.

[0050] like Figure 1 and Figure 2 As shown in this embodiment, the outer hub assembly 300 may include a first brake pad 310 and an outer hub body 320. The outer hub body 320 may be cylindrical, with one end tapered and connected to one side of the power gear 200 by welding; the other end is open and extends away from the power gear 200. The first brake pad 310 may be circular and may be perpendicular to the axis of the power shaft 100. The first brake pad 310 is connected to the outer hub body 320; in its arrangement, the first brake pad 310 may be disposed inside the outer hub body 320 and extend inward along a direction close to the axis of the power shaft 100. Several first brake pads 310 may be spaced apart along the axial direction of the power shaft 100, such as two, three, or four.

[0051] The inner hub assembly 400 may include a second brake pad 410 and an inner hub body 420. Both the second brake pad 410 and the inner hub body 420 may be disposed within the outer hub body 320. The inner hub body 420 may be annular, fitted onto the drive shaft 100, and rotates synchronously with the drive shaft 100. The second brake pad 410 may also be disc-shaped, disposed on the outer side of the inner hub body 420, and extending outward in a direction away from the axis of the drive shaft 100. Similarly, the second brake pad 410 may be perpendicular to the axis of the drive shaft 100, and parallel to the first brake pad 310. Several second brake pads 410 may also be provided circumferentially along the drive shaft 100.

[0052] like Figure 1 and Figure 2 As shown, a plurality of first brake pads 310 and a plurality of second brake pads 410 can be alternately arranged along the axial direction of the power shaft 100, and at least partially overlap along the radial direction of the power shaft 100. In this embodiment, there can be three first brake pads 310 and two second brake pads 410. Of course, in other embodiments, the number of first brake pads 310 and second brake pads 410 can also be other.

[0053] like Figure 3 As shown, when the ball cam pressure plate 510 moves away from the fixed pressure plate 520, it can compress the first brake pad 310 and the second brake pad 410 to bring them into contact. When the first brake pad 310 and the second brake pad 410 are in contact, the inner hub assembly 400 and the outer hub assembly 300 are connected. The outer hub assembly 300 and the inner hub assembly 400, in the connected state, can smoothly transmit the power of the power gear 200 to the power shaft 100, so that the hybrid vehicle can operate smoothly in hybrid mode.

[0054] like Figure 4 As shown, when the ball cam pressure plate 510 moves close to the fixed pressure plate 520 and fully resets, the first brake pad 310 and the second brake pad 410 separate because they are not squeezed by the ball cam pressure plate 510, that is, the outer hub assembly 300 separates from the inner hub assembly 400. At this time, the power of the power shaft 100 can only be transmitted to the inner hub assembly 400 and cannot be transmitted further, so that the hybrid vehicle can operate smoothly in pure electric mode.

[0055] It is understood that, by reasonably setting the structure of the outer hub assembly 300 and the inner hub assembly 400, this embodiment facilitates the connection or separation of the outer hub assembly 300 and the inner hub assembly 400 by the ball bearing ramp device 500.

[0056] More specifically, the inner hub assembly 400 also includes a support plate 430, which abuts the first brake pad 310 and the second brake pad 410 on the support plate 430 when the ball cam pressure plate 510 abuts the first brake pad 310 and the second brake pad 410.

[0057] like Figure 2 As shown in this embodiment, by way of example, the support plate 430 can be disposed on the inner hub body 420, and it can also be disposed on the outer side of the inner hub body 420. The connection between the support plate 430 and the inner hub body 420 can also be welding. Along the axial direction of the power shaft 100, the support plate 430 can be disposed on the side away from the ball cam pressure plate 510 of the plurality of first brake plates 310 and the plurality of second brake plates 410.

[0058] likeFigure 3 As shown, when the hybrid vehicle is in hybrid mode, the ball cam pressure plate 510 moves closer to the first brake pad 310 and the second brake pad 410 and squeezes the first brake pad 310 and the second brake pad 410. At this time, the ball cam pressure plate 510 can abut the first brake pad 310 and the second brake pad 410 against the support plate 430, and the support plate 430 can support the first brake pad 310 and the second brake pad 410.

[0059] It is understood that by setting the support plate 430 in this embodiment, the axial force of the ball cam pressure plate 510 can be transmitted to the power shaft 100 without affecting the force on the power gear 200, so as to make the transmission process more stable and smooth.

[0060] Specifically, the ball ramp electromagnetic clutch also includes an electromagnetic device 600, which causes the ball cam pressure plate 510 to move relative to the fixed pressure plate 520.

[0061] like Figure 1 and Figure 2 As shown in this embodiment, the movement of the ball cam pressure plate 510 relative to the fixed pressure plate 520 can be achieved by the electromagnetic device 600. When the hybrid vehicle needs to operate in hybrid mode, the electromagnetic device 600 can create a speed difference between the ball cam pressure plate 510 and the fixed pressure plate 520, causing the ball cam pressure plate 510 to rise relative to the fixed pressure plate 520, thereby causing the ball cam pressure plate 510 to abut against the first brake pad 310 and the second brake pad 410. When the hybrid vehicle operates in pure electric mode, the electromagnetic device 600 can stop working, so that both the ball cam pressure plate 510 and the fixed pressure plate 520 stop rotating, thereby facilitating the reset of the ball cam pressure plate 510 and further separating the first brake pad 310 and the second brake pad 410.

[0062] It is understood that by setting up the electromagnetic device 600, this embodiment can automate the movement of the ball cam pressure plate 510 relative to the fixed pressure plate 520, which is convenient, quick, and responsive.

[0063] More specifically, the electromagnetic device 600 includes a clutch pressure plate 610 and an electromagnetic coil 620. The clutch pressure plate 610 is slidably connected to the outer hub assembly 300 and rotates synchronously. The electromagnetic coil 620 is used to magnetically attract the clutch pressure plate 610 so that the clutch pressure plate 610 moves closer to the fixed pressure plate 520 and abuts against the fixed pressure plate 520.

[0064] like Figure 1 and Figure 2As shown in this embodiment, the clutch pressure plate 610 can be slidably disposed on the outer hub body 320. Simultaneously, the outer side of the clutch pressure plate 610 and the inner side of the outer hub body 320 can be circumferentially limited by a tenon or other structure, allowing the clutch pressure plate 610 to rotate synchronously with the outer hub body 320. Along the axial direction of the power shaft 100, the clutch pressure plate 610 can be disposed between the ball cam pressure plate 510 and the fixed pressure plate 520. When the clutch pressure plate 610 moves closer to the fixed pressure plate 520, it can abut against the fixed pressure plate 520, thus connecting the clutch pressure plate 610 and the fixed pressure plate 520. The electromagnetic coil 620 can be fixed to the fixed pressure plate 520 by a coil bracket 630. The electromagnetic coil 620 is used to magnetically attract the clutch pressure plate 610, causing it to move closer to the fixed pressure plate 520.

[0065] like Figure 3 As shown, in this embodiment, when the hybrid vehicle is in hybrid mode, the electromagnetic coil 620 is energized, which magnetically attracts the clutch pressure plate 610, causing the clutch pressure plate 610 to move closer to the fixed pressure plate 520. When the clutch pressure plate 610 abuts against the fixed pressure plate 520, the clutch pressure plate 610 connects the fixed pressure plate 520 to the outer hub assembly 300. Since the outer hub assembly 300 rotates synchronously with the power gear 200, the fixed pressure plate 520 can also rotate synchronously with the power gear 200. When the fixed pressure plate 520 rotates, since there is still a speed difference between the power shaft 100 and the power gear 200, the ball cam pressure plate 510 has not yet rotated. Therefore, the ball cam pressure plate 510 climbs relative to the fixed pressure plate 520 under the cooperation of the climbing structure and the steel ball 530. At this time, the ball cam pressure plate 510 moves closer to the first brake pad 310 and the second brake pad 410, causing the first brake pad 310 and the second brake pad 410 to abut against each other. When the first brake pad 310 and the second brake pad 410 come into contact, the outer hub assembly 300 is connected to the inner hub assembly 400, and the power of the power gear 200 can be further transmitted to the power shaft 100 through the outer hub assembly 300 and the inner hub assembly 400, and the power shaft 100 rotates accordingly.

[0066] like Figure 4As shown, when the hybrid vehicle is in pure electric mode, the electromagnetic coil 620 is de-energized and does not engage the clutch pressure plate 610. At this time, the clutch pressure plate 610 can move away from the fixed pressure plate 520 under the action of the driving force, thus separating from it. Since neither the ball cam pressure plate 510 nor the fixed pressure plate 520 rotates, the ball cam pressure plate 510 can also move away from the first brake pad 310 and the second brake pad 410 under the action of the driving force, causing the first brake pad 310 and the second brake pad 410 to separate, thus separating the outer hub assembly 300 from the inner hub assembly 400. Therefore, in pure electric mode, the power from the power shaft 100 cannot be further transmitted to the power gear 200, and the power shaft 100 drives the inner hub assembly 400 to rotate freely.

[0067] It is understood that, by reasonably setting the structure of the electromagnetic device 600, this embodiment facilitates the movement of the ball cam pressure plate 510 relative to the fixed pressure plate 520 by the electromagnetic device 600.

[0068] Specifically, the ball bearing ramp electromagnetic clutch also includes a first elastic reset member 800, which is used to reset the clutch pressure plate 610.

[0069] like Figure 1 and Figure 2 As shown in this embodiment, the first elastic reset member 800 can preferably be a wave spring. An annular groove for arranging the first elastic reset member 800 can be provided on the inner side of the outer hub assembly 300. The outer side of the clutch pressure plate 610 can extend into the annular groove and abut against the side of the first elastic reset member 800 near the first brake pad 310 and the second brake pad 410. When the electromagnetic coil 620 is energized and attracts the clutch pressure plate 610, the clutch pressure plate 610 moves closer to the fixed pressure plate 520 and compresses the first elastic reset member 800. When the electromagnetic coil 620 is de-energized to cancel the attraction to the clutch pressure plate 610, the first elastic reset member 800 can provide a driving force to drive the clutch pressure plate 610 to move in the opposite direction, thereby resetting the clutch pressure plate 610.

[0070] It is understood that by setting the first elastic reset member 800, this embodiment can ensure that the clutch pressure plate 610 always maintains a distance from the fixed pressure plate 520 before moving closer to it, and at the same time, it can ensure that the clutch pressure plate 610 can quickly reset when moving away from the fixed pressure plate 520.

[0071] More specifically, the ball bearing ramp electromagnetic clutch also includes a retaining ring 810, which is disposed on the outer hub assembly 300 and on the side of the clutch pressure plate 610 away from the first elastic reset member 800. The first elastic reset member 800 abuts the clutch pressure plate 610 against the retaining ring 810.

[0072] like Figure 1 As shown in this embodiment, by way of example, the outer hub assembly 300 may also be provided with a groove, and a limiting retaining ring 810 may be arranged in the groove to maintain a fixed position along the circumference of the power shaft 100. The limiting retaining ring 810 may be arranged on the side of the clutch pressure plate 610 away from the first elastic reset member 800. When the first elastic reset member 800 resets the clutch pressure plate 610, the first elastic reset member 800 may abut the clutch pressure plate 610 against the limiting retaining ring 810, and the limiting retaining ring 810 may limit the movement of the clutch pressure plate 610.

[0073] It is understood that by setting a limiting retaining ring 810 to limit the reset movement of the clutch pressure plate 610, this embodiment can prevent the clutch pressure plate 610 from disengaging from the outer hub assembly 300 during the reset process, thereby improving the stability of the ball ramp electromagnetic clutch during use.

[0074] Specifically, the ball ramp electromagnetic clutch also includes a second elastic reset member 900, which is used to reset the ball cam pressure plate 510.

[0075] like Figure 1 and Figure 2 As shown in this embodiment, the second reset member is preferably a counter-rotating spring, which can be sleeved on the power shaft 100, with one end abutting against the fixed structure on the power shaft 100, and the other end abutting against the ball cam pressure plate 510. When the electromagnetic coil 620 is energized, the ball cam pressure plate 510, with the cooperation of the climbing structure and the steel ball 530, climbs relative to the fixed pressure plate 520 and moves closer to the first brake pad 310 and the second brake pad 410, compressing the second elastic reset member 900. When the electromagnetic coil 620 is de-energized, the second elastic reset member 900 can provide driving force to drive the ball cam pressure plate 510 to move in the opposite direction, thereby resetting the ball cam pressure plate 510.

[0076] It is understood that by providing the second elastic reset member 900, this embodiment can ensure that the first brake pad 310 is always spaced from the second brake pad 410 before it moves closer to the first brake pad 310 and the second brake pad 410, and at the same time, it can ensure that the ball cam pressure plate 510 can quickly reset when it moves away from the first brake pad 310 and the second brake pad 410.

[0077] More specifically, the inner hub body 420 is connected to the drive shaft 100 via a spline.

[0078] like Figure 1 and Figure 2 As shown in this embodiment, it is exemplarily illustrated that when the inner hub body 420 is fitted onto the power shaft 100, it can be connected to the power shaft 100 via a spline. The spline connection improves the transmission accuracy of the inner hub body 420 on the power shaft 100, making the connection between the inner hub body 420 and the power shaft 100 tighter. Especially under impact or vibration, the spline friction is greater, making the connection more stable and thus improving the accuracy of the mechanical transmission. Simultaneously, the spline connection also allows for the transmission of large torques to meet the usage requirements of the range-extended hybrid mode.

[0079] More specifically, elastic retaining rings 421 are provided on both sides of the inner hub body 420.

[0080] like Figure 1 and Figure 2 As shown in this embodiment, by way of example, when the power gear 200 is fitted onto the power shaft 100, one side of it can abut against the shoulder of the power shaft 100, while the other side can be provided with a washer. When the inner hub body 420 is fitted onto the power shaft 100, the side of it near the power gear 200 can abut against the washer, and the second elastic reset member 900 can abut against the side of it away from the power gear 200. Elastic retaining rings 421 can be provided on both sides of the inner hub body 420. The elastic retaining rings 421 are preferably shaft-mounted elastic retaining rings 421, which can better position the inner hub body 420 to stably maintain the gap between the first brake pad 310 and the second brake pad 410 when not compressed by the ball cam pressure plate 510.

[0081] Specifically, one of the first brake pad 310 and the second brake pad 410 is a clutch steel plate, and the other is a clutch friction plate.

[0082] like Figure 1 and Figure 2As shown in this embodiment, the clutch friction plate is made of a friction material, which ensures that one of the first brake plate 310 and the second brake plate 410 has good wear resistance, heat resistance, and a high coefficient of friction to ensure timely braking. The clutch steel plate is made of a metal material, which ensures that the other of the first brake plate 310 and the second brake plate 410 has sufficient strength and rigidity to ensure that it can withstand pressure and torque transmission during braking.

[0083] Specifically, the drive gear 200 is rotatably mounted on the drive shaft 100 via a needle roller bearing 210.

[0084] like Figure 1 and Figure 2 As shown in this embodiment, by way of example, when the power gear 200 is rotatably mounted on the power shaft 100, a needle roller bearing 210 can be provided between it and the power shaft 100. The needle roller bearing 210, with its compact structure and high precision, facilitates the assembly of the power gear 200 on the power shaft 100. Furthermore, the needle roller bearing 210's high load-bearing capacity, low coefficient of friction, wear resistance, and strong adaptability ensure the smoothness and effectiveness of power transmission between the power shaft 100 and the power gear 200.

[0085] Specifically, deep groove ball bearings 110 are fitted at both ends of the power shaft 100, and the two deep groove ball bearings 110 are used to axially position the power shaft 100.

[0086] like Figure 1 As shown in this embodiment, the ball-bearing ramp electromagnetic clutch also includes a housing 101, which may be a gearbox housing 101. The housing 101 may include two mating parts that are detachably connected by bolts for easy assembly. The drive shaft 100 may be arranged within the housing 101 and is rotatably disposed within it. A bearing chamber 102 may be provided on the inner side of the housing 101, which can be used to house bearings, preferably deep groove ball bearings 110. When the drive shaft 100 is assembled, both ends are fitted with deep groove ball bearings 110.

[0087] It is understood that by providing deep groove ball bearings 110 at both ends of the power shaft 100 in this embodiment, the power shaft 100 can be better positioned, so that the electromagnetic gap is very small, saving the cost of electromagnetic force and coil.

[0088] The implementation principle of the ball bearing ramp electromagnetic clutch provided in this application embodiment is as follows:

[0089] When the hybrid vehicle is in pure electric mode, power is input from the power shaft 100. At this time, the electromagnetic coil 620 is de-energized, the clutch pressure plate 610 is not attracted and remains separated from the constant pressure plate 520. Simultaneously, neither the constant pressure plate 520 nor the ball cam pressure plate 510 rotates. The ball cam pressure plate 510 does not rise relative to the constant pressure plate 520, causing the first brake pad 310 to separate from the second brake pad 410, thus separating the outer hub assembly 300 from the inner hub assembly 400. Power from the power shaft 100 is only transmitted to the inner hub assembly 400, which rotates freely under the drive of the power shaft 100, while the power gear 200 and the outer hub assembly 300 do not rotate.

[0090] When the hybrid vehicle is in hybrid mode, power is input through the power gear 200, and the outer hub assembly 300 rotates synchronously with the power gear 200. At this time, the electromagnetic coil 620 is energized, and the electromagnetic coil 620 attracts the clutch pressure plate 610, causing the clutch pressure plate 610 to move closer to and abut against the pressure plate 520. When the clutch pressure plate 610 and the pressure plate 520 are in contact, the clutch pressure plate 610 and the pressure plate 520 are connected. At this time, the outer hub assembly 300 sequentially drives the clutch pressure plate 610 and the pressure plate 520 to rotate synchronously. When the pressure plate 520 rotates, due to the speed difference between the power gear 200 and the power shaft 100, the ball cam pressure plate 510 can climb relative to the pressure plate 520. The ball cam pressure plate 510 moves closer to the first brake pad 310 and the second brake pad 410, so that the first brake pad 310 and the second brake pad 410 abut against each other, thereby connecting the outer hub assembly 300 and the inner hub assembly 400. When the outer hub assembly 300 and the inner hub assembly 400 are connected, the inner hub assembly 400 rotates synchronously with the outer hub assembly 300, and the inner hub assembly 400 can further drive the power shaft 100 to rotate, so as to transmit the power of the power gear 200 to the power shaft 100, and complete the power coupling of the engine and the electric motor.

[0091] This application rotatably arranges the ball bearing ramp device 500 on the drive shaft 100 via a one-way bearing 700. This effectively solves the problem that the ball bearing ramp electromagnetic clutch cannot be used in hybrid vehicles, enabling the ball bearing ramp electromagnetic clutch to meet the simple on / off requirements of the clutch in hybrid vehicles. This ensures that the clutch engagement state is not affected during vehicle acceleration and deceleration, avoiding the risk of clutch disengagement during emergency braking and energy recovery in hybrid vehicles.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A ball bearing ramp electromagnetic clutch, characterized in that, The ball bearing ramp electromagnetic clutch includes: Power shaft (100); A power gear (200) is rotatably mounted on the power shaft (100); An outer hub assembly (300) is connected to the power gear (200) and rotates synchronously with the power gear (200); The inner hub assembly (400) is sleeved on the power shaft (100) and rotates synchronously with the power shaft (100); A ball bearing ramp device (500) is mounted on the power shaft (100) via a one-way bearing (700). The ball bearing ramp device (500) is used to connect or disconnect the outer hub assembly (300) from the inner hub assembly (400). When the outer hub assembly (300) is connected to the inner hub assembly (400), the one-way bearing (700) is used to transmit the power of the power gear (200) unidirectionally to the power shaft (100).

2. The ball bearing ramp electromagnetic clutch according to claim 1, characterized in that, The one-way bearing (700) is a one-way needle roller bearing (210).

3. The ball bearing ramp electromagnetic clutch according to claim 1, characterized in that, The ball bearing ramp device (500) includes a ball cam pressure plate (510) and a fixed pressure plate (520), the ball cam pressure plate (510) being movable relative to the fixed pressure plate (520) to connect or disconnect the outer hub assembly (300) from the inner hub assembly (400).

4. The ball bearing ramp electromagnetic clutch according to claim 3, characterized in that, The outer hub assembly (300) includes a first brake pad (310), and the inner hub assembly (400) includes a second brake pad (410). When the outer hub assembly (300) is connected to the inner hub assembly (400), the ball cam pressure plate (510) moves relative to the fixed pressure plate (520) and abuts the first brake pad (310) against the second brake pad (410).

5. The ball bearing ramp electromagnetic clutch according to claim 4, characterized in that, The inner hub assembly (400) also includes a support plate (430), which abuts the first brake pad (310) and the second brake pad (410) on the support plate (430) when the ball cam pressure plate (510) abuts the first brake pad (310) and the second brake pad (410).

6. The ball bearing ramp electromagnetic clutch according to claim 3, characterized in that, The ball ramp electromagnetic clutch also includes an electromagnetic device (600) that causes the ball cam pressure plate (510) to move relative to the fixed pressure plate (520).

7. The ball bearing ramp electromagnetic clutch according to claim 6, characterized in that, The electromagnetic device (600) includes a clutch pressure plate (610) and an electromagnetic coil (620). The clutch pressure plate (610) is slidably connected to the outer hub assembly (300) and rotates synchronously. The electromagnetic coil (620) is used to magnetically attract the clutch pressure plate (610) so that the clutch pressure plate (610) moves closer to the fixed pressure plate (520) and abuts against the fixed pressure plate (520).

8. The ball bearing ramp electromagnetic clutch according to claim 7, characterized in that, The ball bearing ramp electromagnetic clutch further includes a first elastic reset member (800), which is used to reset the clutch pressure plate (610).

9. The ball bearing ramp electromagnetic clutch according to claim 3, characterized in that, The ball ramp electromagnetic clutch further includes a second elastic reset member (900), which is used to reset the ball cam pressure plate (510).

10. The ball bearing ramp electromagnetic clutch according to claim 1, characterized in that, Both ends of the power shaft (100) are fitted with deep groove ball bearings (110), and the two deep groove ball bearings (110) are used to axially position the power shaft (100).

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