Electronic Parking Lock Actuator for Automatic Transmission of Vehicle

• US 20190136960A1
• Filed: 11/02/2018
• Published: 05/09/2019
• Est. Priority Date: 11/02/2017
• Status: Active Grant

• Current Assignee: Johnson Electric International AG (Johnson Electric Holdings Limited)
• Original Assignee: Johnson Electric International AG (Johnson Electric Holdings Limited)
• Inventors: Su, Hang, Li, Linan, Shuai, Yong, Nie, Jinan, Chen, Yajie
• Granted Patent: US 10,641,379 B2
• Time in Patent Office: Days
• CPC Class Codes: F16H 2057/02034 Gearboxes combined or connected with electric machines structural association with electric machines H02K7/116
• CPC Class Codes: F16H 2057/02082 for application in vehicles other than propelling, e.g. adjustment of parts
• CPC Class Codes: F16H 57/021 Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
• CPC Class Codes: F16H 57/029 characterised by means for sealing the gearboxes, e.g. to improve airtightness
• CPC Class Codes: F16H 57/031 characterised by covers or lids for gearboxes
• CPC Class Codes: F16H 57/039 Gearboxes for accommodating worm gears
• CPC Class Codes: F16H 63/3466 using electric motors

Abstract

An electronic parking lock actuator includes a driving motor and a gearbox coupled to the driving motor. The gearbox includes a casing which comprises a base and a cover mounted on the base, a gear housed in the casing and engaged with the driving motor for outputting a driving force generated by the driving motor, and a controller fixed in the casing. The base includes a bottom plate, and a plurality of peripheral walls extending upward from edges of the bottom plate. The bottom plate defines at one or more cavities. The controller includes a printed circuit board and a plurality of electronic components disposed on a side of the printed circuit board facing the bottom plate. The electronic components are accommodated in the cavities.

Claims

1. An electronic parking lock actuator, comprising a driving motor and a gearbox coupled to the driving motor, the gearbox comprising:

a casing comprising a base and a cover mounted on the base, the base comprising a bottom plate, and a plurality of peripheral walls extending upward from edges of the bottom plate, the bottom plate defining at least one cavity;

a gear rotatably received in the casing and connected to the driving motor for outputting a driving force generated by the driving motor; and

a controller fixed in the casing, and comprising a printed circuit board and a plurality of electronic components disposed on a side of the printed circuit board facing the bottom plate, the electronic components being received in the at least one cavity to cause the electronic components and the gear to overlap at least a portion of in an axial direction of the gear.

2. The electronic parking lock actuator of claim 1, wherein the bottom plate of the casing further defines a receiving space receiving the gear, the receiving space is not in communication with the at least one cavity.

3. The electronic parking lock actuator of claim 2, wherein the receiving space comprises a first accommodating area and a second accommodating area coaxially stacked along a direction perpendicular to the bottom plate, the second accommodating area is located below the first accommodating area and has a diameter smaller than a diameter of the first accommodating area, and an opening is defined in a bottom of the second accommodating area, and the opening is aligned with a center of the second accommodating area, the gear includes a disc-like gear body and a gear shaft disposed on one side of the gear body, the gear body is rotatably received in the first accommodating area, and the gear shaft of the gear is rotatably received in the second accommodating area.

4. The electronic parking lock actuator of claim 3, further comprises a magnetic ring disposed on a side of the gear body away from the gear shaft and aligned with a central axis of the gear body.

5. The electronic parking lock actuator of claim 4, wherein the receiving space and the cavity are defined by recessing from an upper surface of the bottom plate, and an upper surface of the bottom plate is perpendicular to the gear shaft.

6. The electronic parking lock actuator of claim 2, further comprises a gear lid fixed in the casing, to seal the gear shaft.

7. The electronic parking lock actuator of claim 6, wherein a plurality of fixing holes is defined in the gear lid, and a plurality of first positioning posts is disposed on the bottom plate correspondingly fixed in the plurality of fixing holes to fix the gear lid to the bottom plate.

8. The electronic parking lock actuator of claim 7, wherein the first positioning posts are evenly distributed along the circumferential direction around the receiving space.

9. The electronic parking lock actuator of claim 1, wherein a plurality of fixing holes is defined in the printed circuit board, and a plurality of second positioning posts is disposed on the bottom plate correspondingly fixed in the plurality of fixing holes to fix the controller to the bottom plate.

10. The electronic parking lock actuator of claim 1, wherein the at least one cavity comprises more than one cavities not in communicated with each other.