Dual-piston electronic parking actuator for a vehicle and vehicle

Abstract

The present application discloses a dual-piston electronic parking actuator for a vehicle and a vehicle. The dual-piston electronic parking actuator includes: a power source; a differential, the differential having a differential input end and two differential output ends, the differential input end being power-connected to the power source, and the differential output ends being power-connected to two parking pistons of the vehicle; wherein the differential is configured to differentially distribute the power of the power source to the two differential output ends when the forces on the two parking pistons are different. The dual-piston electronic parking actuator according to the present application simplifies the structure, develops from two separate power transmission systems into one power transmission system, and simultaneously controls two parking pistons of the brake.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and more particularly to a dual-piston electronic parking actuator for vehicles and a vehicle. Background Art

[0002] In the prior art, the power transmission mechanism of a dual-piston brake caliper is two sets of independent power output transmission mechanisms, that is, two power output motors and two sets of separate power transmission mechanisms, which respectively drive the two pistons of the brake to provide braking force. The disadvantages of the current prior art are as follows:

[0003] 1. The structure of the electronic control system is complex, the control is difficult, and the cost is high. Since it is necessary to control two sets of power transmission systems at the same time and make the two pistons reach the same clamping force, the control logic is complex, the control accuracy requirement is high, and more precise electrical components are required;

[0004] 2. The mechanical structure is complex and the number of parts is large. Since two sets of separate power transmission systems are required, compared with the power transmission mechanism of a single-piston brake, the number of parts and the cost increase. Moreover, it is required that the two sets of power transmission systems have high part precision and consistency to ensure that the efficiency of the two sets of power transmission systems is always the same and the two pistons reach the same clamping force.

[0005] 3. The manufacturing cost of parts is high. Since two motors, two sets of wire harness connectors, two sets of speed reduction and torque increasing mechanisms, two sets of housings and sealing mechanisms are required, the cost is significantly increased.

[0006] 4. It has a large weight and occupies a large volume, and the space layout is limited. The two sets of power transmission systems are arranged separately and installed separately, occupying a large space, and it is impossible to arrange for brakes with a short distance between the two pistons. Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present application is to provide a dual-piston electronic parking actuator for vehicles, which simplifies the mechanism and develops from two sets of separate power transmission systems into one set of power transmission systems to control the two parking pistons of the brake at the same time.

[0008] The present application also provides a vehicle having the above dual-piston electronic parking actuator.

[0009] The dual-piston electronic parking actuator for a vehicle according to the present application includes: a power source; a differential having a differential input end and two differential output ends, the differential input end being power-connected to the power source, and the differential output ends being power-connected to two parking pistons of the vehicle; wherein the differential is configured to differentially distribute the power of the power source to the two differential output ends when the forces on the two parking pistons are different.

[0010] The dual-piston electronic parking actuator for a vehicle according to the present application only uses one power source, and distributes the power of one power source to two parking pistons through a differential, simplifying the power transmission mechanism of the automotive dual-piston brake, developing from two separate power transmission systems into one power transmission system, controlling two parking pistons of the brake simultaneously, and having a differential function so that the same clamping force can be achieved during clamping. Compared with other power transmission mechanisms of dual-piston brakes, it has a lower manufacturing cost and occupies less space.

[0011] According to an embodiment of the present application, the dual-piston electronic parking actuator further includes: a first-stage transmission mechanism having a first input end and a first output end, the first input end being connected to the power source, and the first output end being connected to the differential input end.

[0012] According to an embodiment of the present application, the dual-piston electronic parking actuator further includes: two second-stage transmission mechanisms, each second-stage transmission mechanism having a second input end and a second output end, each second input end being connected to a corresponding differential output end, and each second output end being connected to a corresponding parking piston.

[0013] According to an embodiment of the present application, the first-stage transmission mechanism includes: a first worm gear connected to the power source; a first worm wheel meshing with the first worm gear and connected to the differential input end.

[0014] According to an embodiment of the present application, the differential includes: a planetary gear carrier fixed on the first worm wheel; a first planetary gear and a second planetary gear rotatably disposed on the planetary gear carrier; two sun gears, each sun gear meshing with the first planetary gear and the second planetary gear respectively, and each sun gear being connected to a corresponding second input end.

[0015] According to an embodiment of the present application, the dual-piston electronic parking actuator further includes: a locking mechanism. There are two locking mechanisms, and each locking mechanism is disposed between the differential and the corresponding parking piston. The locking mechanism is configured to output power from the first planetary gear and the second planetary gear to the parking piston when the parking piston cylinder performs a clamping action, and to output power from the parking piston to the planetary gear carrier when the parking piston cylinder performs a release action.

[0016] According to an embodiment of the present application, the first planetary gear, the second planetary gear, and the two sun gears are all bevel gears.

[0017] According to an embodiment of the present application, on the inner circumferential surface of the first worm gear, there are a first mounting surface and a second mounting surface facing each other. A first mounting hole is provided on the first mounting surface, and a second mounting hole is provided on the second mounting surface; on the planetary gear carrier, there are a first mounting shaft and the second mounting shaft. The first mounting shaft is engaged with the first mounting hole, and the second mounting shaft is engaged with the second mounting hole.

[0018] According to an embodiment of the present application, the second-stage transmission mechanism includes: a second worm, with a sun gear provided at one end of the second worm; a second worm gear, which meshes with the first worm, and the second worm gear is connected to the corresponding parking piston.

[0019] According to an embodiment of the present application, the locking mechanism is configured as a one-way bearing. The one-way bearing is disposed between the one end of the corresponding second worm and the planetary gear carrier, and the one-way bearing is configured to rotate unidirectionally when the parking piston cylinder performs a clamping action and to lock when the parking piston cylinder performs a release action.

[0020] According to an embodiment of the present application, a positioning hole is provided on the planetary gear carrier, and a positioning pin that mates with the positioning hole is provided at one end of the second worm.

[0021] According to an embodiment of the present application, the central axis of the positioning hole coincides with the central axis of the first worm gear.

[0022] According to an embodiment of the present application, the second worm gear is connected to the corresponding parking piston through a rolling screw.

[0023] According to an embodiment of the present application, the dual-piston electronic parking actuator further includes: a housing. The first transmission mechanism, the second transmission mechanism, and the differential are all disposed inside the housing, and a bearing is provided between the other end of the second worm and the housing.

[0024] The vehicle according to the present application includes the above-described dual-piston electronic parking actuator. Since the vehicle according to the present application is provided with the above-described dual-piston electronic parking actuator, the vehicle control logic is simple, the requirements for electrical components are low, and the structure is simple, greatly improving the production efficiency of the vehicle and reducing the manufacturing cost of the vehicle.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is an exploded view of a dual-piston electronic parking actuator according to an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of a power source, a first-stage transmission mechanism, a differential, and a second-stage transmission mechanism according to an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a planetary gear carrier according to an embodiment of the present application;

[0030] Figure 4 is a schematic diagram of a first worm gear according to an embodiment of the present application;

[0031] Figure 5 is a mating diagram of a second worm and a sun gear according to an embodiment of the present application.

[0032] Reference numerals: dual-piston electronic parking actuator 100,

[0033] differential 110, planetary gear carrier 111, first mounting shaft 111a, first planetary gear 112, second planetary gear 113, sun gear 114, positioning hole 103,

[0034] first-stage transmission mechanism 120, first worm 121, first worm gear 122, first mounting surface 101, first mounting hole 102,

[0035] second-stage transmission mechanism 130, second worm 131, second worm gear 132, positioning pin 131a,

[0036] housing 140, power source 150, one-way bearing 160. Detailed Description of the Embodiments

[0037] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0038] Reference will be made below Figures 1 - 5 to describe a dual-piston electronic parking actuator 100 for a vehicle according to an embodiment of the present application.

[0039] The dual-piston electronic parking actuator 100 for a vehicle according to an embodiment of the present application includes a power source 150 and a differential 110.

[0040] Among them, there is only one power source 150 in the present application. The power source 150 can supply power to two parking pistons simultaneously. The power source 150 can be a driving motor. Of course, the power source 150 in the present application is not limited thereto.

[0041] The differential 110 has a differential input end and two differential output ends. The differential input end is power-connected to the power source 150, and the differential output ends are power-connected to two parking pistons of the vehicle. The differential 110 can distribute the power of the power source 150 to the two parking pistons, and the differential 110 is configured to differentially distribute the power of the power source 150 to the two differential output ends when the forces on the two parking pistons are different.

[0042] For the dual-piston electronic parking actuator 100 for a vehicle according to an embodiment of the present application, only one power source 150 is adopted. The power of one power source 150 is distributed to two parking pistons through the differential 110, which simplifies the power transmission mechanism of the automotive dual-piston brake, develops from two separate power transmission systems to one power transmission system, controls two parking pistons of the brake simultaneously, and has a differential function so that the same clamping force can be achieved during clamping. Compared with other dual-piston brake power transmission mechanisms, the manufacturing cost is lower and the occupied space is smaller.

[0043] In addition, the control center of the vehicle in the present application only controls one power source 150 (for example, a motor), the control logic is simple, and the requirements for electrical components are relatively low. The present application uses one motor to supply power to two parking pistons, the mechanical structure is simple, and the number of parts is small. The corresponding power source 150, wire harness connectors, reduction mechanisms, and housing mechanisms all only use one set. In addition, the dual-piston electronic parking actuator 100 has a compact structure, which is convenient for space layout and application promotion.

[0044] In an embodiment of the present application, as Figure 2As shown, the dual-piston electronic parking actuator 100 further includes: a first-stage transmission mechanism 120. The first-stage transmission mechanism 120 has a first input end and a first output end. The first input end is connected to the power source 150, and the first output end is connected to the differential input end.

[0045] Further, the dual-piston electronic parking actuator 100 further includes: two second-stage transmission mechanisms 130. Each second-stage transmission mechanism 130 has a second input end and a second output end. Each second input end is connected to the corresponding differential output end.

[0046] The first-stage transmission mechanism 120 can transmit the power of the power source 150 to the differential 110. At the same time, the second-stage transmission mechanism 130 can transmit the power distributed by the differential 110 to the corresponding parking pistons.

[0047] Each first-stage transmission mechanism 120 includes a first worm 121 and a first worm gear 122. The first worm 121 is connected to the power source 150. The first worm gear 122 meshes with the first worm 121 and the first worm gear 122 is connected to the differential input end. The first worm 121 is the first input end, and the first worm gear 122 is the second input end. The differential input end can be the driving gear on the differential housing. In the embodiments of the present application, the first worm gear 122 and the driving gear on the differential housing are the same component, thereby further simplifying the structure of the dual-piston electronic parking actuator 100, making the mechanical structure of the dual-piston electronic parking actuator 100 simple and the number of parts small.

[0048] Furthermore, the helix angle of the first worm 121 or the first worm gear 122 is less than the friction angle. Thus, the first-stage transmission mechanism 120 can be a self-locking mechanism.

[0049] In some embodiments of the present application, as Figure 2 shown, the differential 110 includes: a planetary gear carrier 111, a first planetary gear 112, a second planetary gear 113, and a sun gear 114.

[0050] The planetary gear carrier 111 is fixed on the first worm gear 122. The planetary gear carrier 111 can rotate with the rotation of the first worm gear 122. The first planetary gear 112 and the second planetary gear 113 are rotatably arranged on the planetary gear carrier 111. There are two sun gears 114. Each sun gear 114 meshes with the first planetary gear 112 and the second planetary gear 113 respectively, and each sun gear 114 is connected to the corresponding second input end. The sun gear 114 is the differential output end.

[0051] When the forces on the two parking pistons are the same, the first planetary gear 112 and the second planetary gear 113 do not rotate, and the planetary gear carrier 111 rotates as the first worm gear 122 rotates, thereby evenly distributing the power output by the power source 150 to the two parking pistons. When the forces on the two parking pistons are different, the first planetary gear 112 and the second planetary gear 113 rotate, so that the power output by the power source 150 can be differentially distributed to the two differential output ends.

[0052] Specifically, the differential 110 includes a planetary gear carrier 111, a first planetary gear 112 and a second planetary gear 113 rotatably arranged on the planetary gear carrier 111. The planetary gear carrier 111 is power-connected to the power source 150, and the first planetary gear 112 and the second planetary gear 113 are power-connected to the two parking pistons of the vehicle.

[0053] The dual-piston electronic parking actuator 100 further includes locking mechanisms. There are two locking mechanisms, and each locking mechanism is arranged between the differential and the corresponding parking piston. The locking mechanism is configured to output power from the first planetary gear 112 and the second planetary gear 113 to the parking piston when the parking piston cylinder performs a clamping action, and output power from the parking piston to the planetary gear carrier 111 when the parking piston cylinder performs a release action.

[0054] That is to say, the power transmission when the piston cylinder performs a clamping action and the power transmission when the parking piston cylinder performs a release action are not completely opposite relationships. When the parking piston cylinder performs a clamping action, the power source 150 needs to provide power to the parking piston. At this time, the power can be transmitted to the parking piston through the first planetary gear 112 and the second planetary gear 113, so that when the forces on the two parking pistons are different, the power of the power source 150 is differentially distributed to the two parking pistons, and finally the two parking pistons can reach almost the same clamping force; when the parking piston cylinder performs a release action, the power of the two parking pistons will not be differentially transmitted to the planetary gear carrier 111, but the two parking pistons synchronously transmit the same power to the planetary gear carrier 111, and the displacements of the two parking pistons are also the same.

[0055] Furthermore, the first planetary gear 112, the second planetary gear 113, and the two sun gears 114 are all bevel gears. Thus, the direction of power can be changed during transmission, reducing the overall size of the dual-piston electronic parking actuator 100.

[0056] Such as Figure 3As shown, on the inner circumferential surface of the first worm gear 122, there are a first mounting surface 101 and a second mounting surface (not shown) facing each other. On the first mounting surface 101, there is a first mounting hole 102, and on the second mounting surface, there is a second mounting hole (not shown); on the planetary gear carrier 111, there are a first mounting shaft 111a and a second mounting shaft. The first mounting shaft 111a cooperates with the first mounting hole 102, and the second mounting shaft cooperates with the second mounting hole. Thus, the planetary gear carrier 111 can be firmly mounted on the first worm gear 122, ensuring that the planetary gear carrier 111 rotates as the first worm gear 122 rotates. Preferably, the center of the planetary gear carrier 111 coincides with the center of the first worm gear 122.

[0057] In some embodiments of the present application, the second-stage transmission mechanism 130 includes a second worm 131 and a second worm gear 132. At one end of the second worm 131, there is a sun gear 114. The second worm gear 132 meshes with the first worm 121, and the second worm 131 is connected to the corresponding parking piston. The second-stage transmission mechanism 130 can transmit the power distributed by the differential 110 to the corresponding parking piston. At the same time, the second-stage transmission mechanism 130 can achieve the effect of reducing speed and increasing torque, improving the braking force of the parking piston. It should be noted that the second worm 131 is the second input end, and the second worm gear 132 is the second output end.

[0058] The locking mechanism is configured as a one-way bearing 160. The one-way bearing 160 is disposed between one end of the corresponding second worm and the planetary gear carrier 111. The one-way bearing 160 is configured to rotate unidirectionally when the parking piston cylinder performs a clamping action and lock when the parking piston cylinder performs a release action.

[0059] That is to say, when the parking piston cylinder performs a clamping action, the power source 150 needs to provide power to the parking piston, and the one-way bearing 160 can rotate, so that the power of the planetary gear carrier 111 is not directly transmitted to the two second worms 131. At this time, the power can be transmitted to the corresponding second worm 131 through the first planetary gear 112, the second planetary gear 113, and the corresponding sun gear. Thus, when the forces on the two parking pistons are different, the power of the power source 150 is differentially distributed to the two sun gears, and finally the two parking pistons can reach almost the same clamping force; when the parking piston cylinder performs a release action, the one-way bearing 160 locks, and the power of the two parking pistons is not transmitted to the first planetary gear 112 and the second planetary gear 113 through the second worm 131 and the sun gear 114, but is directly transmitted from the second worm 131 to the planetary gear carrier 111. The two parking pistons are synchronized and transmit the same power to the planetary gear carrier, and the displacements of the two parking pistons are also the same.

[0060] According to some embodiments of the present application, such as Figure 3As shown, a positioning hole 103 is provided on the planetary gear carrier 111, and a positioning pin 131a that mates with the positioning hole 103 is provided at one end of the second worm 131. Thus, when installing the second worm 131, positioning with the planetary gear carrier 111 can be achieved first, improving the overall installation efficiency of the dual-piston electronic parking actuator 100.

[0061] Furthermore, the central axis of the positioning hole 103 coincides with the central axis of the first worm gear 122, so that the power transmitted to the first worm gear 122 can be stably distributed to the two second worms 131 through the planetary gears, the planet carrier, and the sun gear 114.

[0062] According to some embodiments of the present application, the second worm gear 132 is connected to the corresponding parking piston through a rolling screw thread, so that it can be ensured that the parking piston can reciprocate axially to achieve the parking action and the release of the parking action.

[0063] It should be noted that if a one-way bearing 60 is adopted in the dual-piston electronic parking actuator in the embodiments of the present application, the rolling screw thread is configured as a self-locking structure, so that when the parking piston performs the clamping action, it will not retract, improving the parking stability.

[0064] The dual-piston electronic parking actuator 100 of the embodiments of the present application further includes a housing 140. The first-stage transmission mechanism 120, the second-stage transmission mechanism 130, and the differential 110 are all arranged inside the housing 140. A bearing is provided between the other end of the second worm 131 and the housing. This ensures that the second worm 131 can rotate smoothly relative to the housing.

[0065] The vehicle of the embodiments of the present application will be briefly described below.

[0066] The vehicle according to the embodiments of the present application includes the dual-piston electronic parking actuator 100 of the above embodiments. Since the vehicle according to the present application is provided with the above dual-piston electronic parking actuator 100, the control logic of the vehicle is simple, the requirements for electrical components are low, and the structure is simple, greatly improving the production efficiency of the vehicle and reducing the manufacturing cost of the vehicle.

[0067] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A dual-piston electronic parking actuator (100) for a vehicle, characterized in that, Comprising: A power source (150); A differential (110), the differential (110) having a differential input end and two differential output ends, the differential input end being power-connected to the power source (150), and the differential output ends being power-connected to two parking pistons of the vehicle; Wherein The differential (110) is configured to differentially distribute the power of the power source (150) to the two differential output ends when the two parking pistons are subjected to different forces; Also comprising: A first-stage transmission mechanism (120), the first-stage transmission mechanism (120) including: A first worm (121), the first worm (121) being connected to the power source (150); A first worm gear, the first worm gear (122) being meshed with the first worm (121) and the first worm gear (122) being connected to the differential input end; Also comprising: Two second-stage transmission mechanisms (130), each second-stage transmission mechanism (130) having a second input end and a second output end; The differential (110) includes: A planetary gear carrier (111), the planetary gear carrier (111) being fixed on the first worm gear (122); A first planetary gear (112) and a second planetary gear (113), the first planetary gear (112) and the second planetary gear (113) being rotatably disposed on the planetary gear carrier (111); Two sun gears (114), each sun gear (114) being meshed with the first planetary gear (112) and the second planetary gear (113), and each sun gear (114) being respectively connected to the corresponding second input end; Also comprising: A locking mechanism, there being two locking mechanisms and each locking mechanism being disposed between the differential and the corresponding parking piston, the locking mechanism being configured to output power from the first planetary gear (112) and the second planetary gear (113) to the parking piston when the parking piston cylinder performs a clamping action, and to output power from the parking piston to the planetary gear carrier (111) when the parking piston cylinder performs a release action; A wire harness connector, the number of the wire harness connectors corresponding to the number of the power sources (150).

2. The dual-piston electronic parking actuator (100) for a vehicle according to claim 1, characterized in that, The first-stage transmission mechanism (120) has a first input end and a first output end, the first input end being connected to the power source (150), and the first output end being connected to the differential input end.

3. The dual-piston electronic parking actuator (100) for a vehicle according to claim 2, characterized in that, Each second input end is connected to the corresponding differential output end, and each second output end is connected to the corresponding parking piston.

4. The dual-piston electronic parking actuator (100) for a vehicle according to claim 1, characterized in that, The first planetary gear (112), the second planetary gear (113), and the two sun gears (114) are all bevel gears.

5. The dual-piston electronic parking actuator (100) for a vehicle according to claim 1, characterized in that, On the inner peripheral surface of the first worm gear (122), there are a first mounting surface (101) and a second mounting surface facing each other, a first mounting hole (102) is provided on the first mounting surface (101), and a second mounting hole is provided on the second mounting surface; A first mounting shaft (111a) and a second mounting shaft are provided on the planetary gear carrier (111). The first mounting shaft (111a) is engaged with the first mounting hole (102), and the second mounting shaft is engaged with the second mounting hole.

6. The dual-piston electronic parking actuator (100) for a vehicle according to claim 1, characterized in that, The second-stage transmission mechanism (130) includes: A second worm (131) having a sun gear (114) provided at one end thereof; A second worm gear (132) engaged with the first worm (121) and connected to the corresponding parking piston.

7. The dual-piston electronic parking actuator (100) for a vehicle according to claim 6, characterized in that, The locking mechanism is configured as a one-way bearing (160) provided between the one end of the corresponding second worm and the planetary gear carrier (111). The one-way bearing (160) is configured to rotate unidirectionally when the parking piston cylinder performs a clamping action and lock when the parking piston cylinder performs a release action.

8. The dual-piston electronic parking actuator (100) for a vehicle according to claim 6, characterized in that, A positioning hole (103) is provided on the planetary gear carrier (111), and a positioning pin (131a) engaged with the positioning hole (103) is provided at one end of the second worm (131).

9. The dual-piston electronic parking actuator (100) for a vehicle according to claim 8, characterized in that, The central axis of the positioning hole (103) coincides with the central axis of the first worm gear (122).

10. The dual-piston electronic parking actuator (100) for a vehicle according to claim 7, characterized in that, The second worm gear (132) is connected to the corresponding parking piston through a rolling screw thread.

11. The dual-piston electronic parking actuator (100) for a vehicle according to claim 6, characterized in that, It further includes: A housing (140) in which the first-stage transmission mechanism (120), the second-stage transmission mechanism (130), and the differential (110) are all provided. A bearing is provided between the other end of the second worm (131) and the housing (140).

12. A vehicle, characterized in that, It includes the dual-piston electronic parking actuator (100) according to any one of claims 1-11.

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