Electric axle transmission for electric and hybrid electric vehicles
US-2019344660-A1 · Nov 14, 2019 · US
Power transmission device
US12188557B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12188557-B2 |
| Application number | US-201917428553-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 26, 2019 |
| Priority date | Feb 8, 2019 |
| Publication date | Jan 7, 2025 |
| Grant date | Jan 7, 2025 |
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- Title
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Abstract
Official abstract text for this publication.
A power transmission device includes a transmission mechanism including a planetary gear set, a first engagement element, and a second engagement element. The first engagement element is a band brake configured to be engaged when the transmission mechanism is in a low gear speed. The second engagement element is a multi-plate friction clutch configured to be engaged when the transmission mechanism is in a high gear speed. The multi-plate friction clutch includes a driven plate and a drive plate. The band brake overlaps with the driven plate and the drive plate of the multi-plate friction clutch in a radial direction.
First claim
Opening claim text (preview).
The invention claimed is: 1. A power transmission device comprising: a transmission mechanism having a planetary gear set, a first engagement element that is a band brake configured to be engaged when the transmission mechanism is in a low gear speed, and a second engagement element that is a multi-plate friction clutch configured to be engaged when the transmission mechanism is in a high gear speed, the multi-plate friction clutch including a driven plate, a drive plate, and a piston; and a motor arranged upstream of the transmission mechanism, wherein the driven plate, the drive plate, and the piston of the multi-plate friction clutch overlap the band brake and the planetary gear set in the radial direction, at least one of the driven plate and the drive plate of the multi-plate friction clutch is arranged on a radially outward side of a ring gear of the planetary gear set, the transmission mechanism is a two-speed transmission mechanism, an output rotation of the transmission mechanism in the high gear speed and an output rotation of the transmission mechanism in the low gear speed are in the same rotational direction, and a rotational direction of an output rotation of the transmission mechanism is switched between forward and reverse by switching a rotational direction of the motor. 2. The power transmission device according to claim 1 , wherein the band brake overlaps with the planetary gear set in the radial direction. 3. The power transmission device according to claim 1 , further comprising: a differential device arranged downstream of the transmission mechanism, and a drive shaft arranged downstream of the differential device, wherein the motor, the transmission mechanism and the differential device overlap in an axial direction, and the drive shaft penetrates the motor and the transmission mechanism.
Assignees
Inventors
Classifications
with planetary gearing having orbital motion · CPC title
with two engaging means · CPC title
with one sets of orbital gears · CPC title
the gear ratios comprising two forward speeds · CPC title
specially adapted for electric vehicles · CPC title
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- What does patent US12188557B2 cover?
- A power transmission device includes a transmission mechanism including a planetary gear set, a first engagement element, and a second engagement element. The first engagement element is a band brake configured to be engaged when the transmission mechanism is in a low gear speed. The second engagement element is a multi-plate friction clutch configured to be engaged when the transmission mechan…
- Who is the assignee on this patent?
- Jatco Ltd
- What technology area does this patent fall under?
- Primary CPC classification F16H63/3003. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 07 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).