EP-4742641-A2 - ROTATING MECHANISM AND FOLDABLE ELECTRONIC DEVICE

EP4742641A2EP 4742641 A2EP4742641 A2EP 4742641A2EP-4742641-A2

Abstract

This application provides a rotating mechanism and a foldable electronic device. The rotating mechanism includes a fixed base, a first synchronization swing arm, a second synchronization swing arm, and a synchronization gear. A first gear, an intermediate gear, and a second gear of the synchronization gear are all helical gears, the first gear, the intermediate gear, and the second gear are disposed side by side and in parallel, and the intermediate gear is located between the first gear and the second gear and engages with the first gear and the second gear. The first synchronization swing arm is fastened to the first gear, and the second synchronization swing arm is fastened to the second gear. The synchronization gear is mounted in the fixed base and is rotatably connected to the fixed base, the first synchronization swing arm and the second synchronization swing arm are respectively located on two opposite sides of the fixed base in a width direction, a rotation direction of the first synchronization swing arm is opposite to a rotation direction of the second synchronization swing arm, and a rotation direction of the first gear is opposite to a rotation direction of the second gear. The rotating mechanism provided in this application can resolve a technical problem of poor transmission stability of a rotating mechanism in the conventional technology.

Inventors

CHEN, Ruihao
DONG, Shaohong
PENG, Gaofeng
SU, SHUAI
HUANG, JIAN

Assignees

Honor Device Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20230908

Claims (15)

A rotating mechanism, comprising a fixed base, a first main swing arm, a second main swing arm, a first fastening plate, and a second fastening plate, wherein the first fastening plate and the second fastening plate are respectively located on the two opposite sides of the fixed base in the width direction; a first rotation groove and a second rotation groove are disposed in the fixed base, and the first rotation groove is disposed opposite to the second rotation groove, the first rotation groove comprises a first slide rail and two second slide rails, and the two second slide rails are respectively located on two opposite sides of the first slide rail and are disposed side by side with the first slide rail in a length direction of the fixed base; and the first main swing arm is mounted in the first rotation groove and is slidable and rotatable along the first rotation groove, and the first main swing arm is rotatably connected to the first fastening plate; and the second main swing arm is mounted in the second rotation groove and is slidable and rotatable along the second rotation groove, and the second main swing arm is rotatably connected to the second fastening plate.
The rotating mechanism according to claim 1, wherein the first main swing arm comprises a first rotation body and a first swing body, the first rotation body is fastened to the first swing body, the first rotation body comprises a first slide part and two second slide parts, and the two second slide parts are connected to two opposite sides of the first slide part; the first rotation body is mounted in the first rotation groove, the first slide part is mounted in the first slide rail, and one second slide part is mounted in one second slide rail.
The rotating mechanism according to claim 2, wherein one second slide rail comprises a slide rail bottom wall and a bump, the bump is connected to a side wall of the first rotation groove and is disposed opposite to and apart from the slide rail bottom wall, a first hollow part is further disposed on a bottom wall of the first rotation groove, and the first hollow part penetrates the bottom wall of the first rotation groove and is disposed opposite to the bump; and the second slide part is located between the slide rail bottom wall and the bump.
The rotating mechanism according to any one of claims 1 to 3, wherein a first rotation shaft and a second rotation shaft are further mounted in the fixed base, the first rotation shaft and the second rotation shaft are disposed opposite to and parallel to each other and are rotatably connected to the fixed base, and both extension directions of the first rotation shaft and the second rotation shaft are parallel to the length direction of the fixed base; and the rotating mechanism comprises a first auxiliary swing arm and a second auxiliary swing arm, and the first auxiliary swing arm is fastened to the first rotation shaft and is slidably connected to the first fastening plate; and the second auxiliary swing arm is fastened to the second rotation shaft and is slidably connected to the second fastening plate.
The rotating mechanism according to claim 4, wherein the rotating mechanism further comprises a floating plate, and the floating plate is mounted in the fixed base and is rotatably connected to the first rotation shaft and the second rotation shaft; and when rotating relative to the fixed base, the first auxiliary swing arm drives the first rotation shaft to rotate, when rotating relative to the fixed base, the second auxiliary swing arm drives the second rotation shaft to rotate, and the first rotation shaft and the second rotation shaft rotate, to drive the floating plate to move in a thickness direction of the fixed base.
The rotating mechanism according to claim 5, wherein the rotating mechanism further comprises a flexible support member, the floating plate is located between the fixed base and the flexible support member.
The rotating mechanism according to claim 5 or 6, wherein the first rotation shaft comprises a first fastening part and a first extension part, and an axis of the first fastening part is disposed parallel to and apart from an axis of the first extension part; the second rotation shaft comprises a second fastening part and a second extension part, and an axis of the second fastening part is disposed parallel to and apart from an axis of the second extension part; and a first mounting groove and a second mounting groove are disposed in the floating plate, and the first mounting groove is disposed apart from the second mounting groove; the first extension part is located in the first mounting groove, and the second extension part is located in the second mounting groove; and when the first auxiliary swing arm and the second auxiliary swing arm rotate in a direction close to each other, the first extension part and the second extension part drive the floating plate to move toward the fixed base; and when the first auxiliary swing arm and the second auxiliary swing arm rotate in a direction away from each other, the first extension part and the second extension part drive the floating plate to move in a direction away from the fixed base.
The rotating mechanism according to any one of claims 1 to 7, wherein the rotating mechanism further comprises a first synchronization swing arm, a second synchronization swing arm, a synchronization gear, a first rotation lever, and a second rotation lever, wherein the synchronization gear comprises a first gear, a second gear, and an intermediate gear, the first gear, the intermediate gear, and the second gear are all helical gears, the first gear, the intermediate gear, and the second gear are disposed side by side and in parallel, and the intermediate gear is located between the first gear and the second gear and engages with the first gear and the second gear; the first synchronization swing arm is fastened to the first rotation lever, the first rotation lever is fastened to the first gear, and the second synchronization swing arm is fastened to the second rotation lever, the second rotation lever is fastened to the second gear; and the first synchronization swing arm and the second synchronization swing arm are respectively located on two opposite sides of the fixed base in a width direction, a rotation direction of the first synchronization swing arm is opposite to a rotation direction of the second synchronization swing arm, and a rotation direction of the first gear is opposite to a rotation direction of the second gear.
The rotating mechanism according to claim 8, wherein a contact ratio between the intermediate gear and the first gear is greater than 1.2, and a contact ratio between the intermediate gear and the second gear is greater than 1.2.
The rotating mechanism according to claim 8 or 9, wherein the intermediate gear comprises a third gear and a fourth gear, both the third gear and the fourth gear are helical gears, both the third gear and the fourth gear are disposed between the first gear and the second gear, the third gear engages with the first gear, and the fourth gear engages with the second gear and the third gear.
The rotating mechanism according to claim 10, wherein the first gear comprises first teeth, the second gear comprises second teeth, the third gear comprises third teeth, and the fourth gear comprises fourth teeth; and the first teeth, the second teeth, the third teeth, and the fourth teeth are all helical, a helical direction of the first tooth is opposite to a helical direction of the second tooth, and a helical direction of the third teeth is opposite to a helical direction of the fourth teeth.
The rotating mechanism according to claim 10, wherein the first gear comprises first teeth, the second gear comprises second teeth, the third gear comprises third teeth, and the fourth gear comprises fourth teeth; and the first teeth, the second teeth, the third teeth, and the fourth teeth are all "V"-shaped.
The rotating mechanism according to claim 12, wherein the first tooth comprises a first sub-teeth and a second sub-teeth, both the first sub-teeth and the second sub-teeth are helical teeth, and the first sub-teeth is fastened to the second sub-teeth in an axial direction of the first gear; the second teeth comprises a third sub-teeth and a fourth sub-teeth, both the third sub-teeth and the fourth sub-teeth are helical teeth, and the third sub-teeth is fastened to the fourth sub-teeth in an axial direction of the second gear; the third teeth comprises a fifth sub-teeth and a sixth sub-teeth, both the fifth sub-teeth and the sixth sub-teeth are helical teeth, and the fifth sub-teeth is fastened to the sixth sub-teeth in an axial direction of the third gear; and the fourth teeth comprises a seventh sub-teeth and an eighth sub-teeth, both the seventh sub-teeth and the eighth sub-teeth are helical teeth, and the seventh sub-teeth is fastened to the eighth sub-teeth in an axial direction of the fourth gear; and the first sub-teeth engages with the fifth sub-teeth, the fifth sub-teeth engages with the seventh sub-teeth, and the seventh sub-teeth engages with the third sub-teeth; and the second sub-teeth engages with the sixth sub-teeth, the sixth sub-teeth engages with the eighth sub-teeth, and the eighth sub-teeth engages with the fourth sub-teeth.
The rotating mechanism according to any one of claims 1 to 13, wherein the rotating mechanism further comprises a first pressing plate, a second pressing plate, a first pressing plate swing arm and a second pressing plate swing arm; the first pressing plate is slidably and rotatably connected to the first fastening plate, and when rotating relative to the fixed base, the first fastening plate drives the first pressing plate to rotate relative to the fixed base; and the second pressing plate is slidably and rotatably connected to the second fastening plate, and when rotating relative to the fixed base, the second fastening plate drives the second pressing plate to rotate relative to the fixed base; a third rotation groove and a fourth rotation groove are further disposed in the fixed base, and the third rotation groove is disposed opposite to the fourth rotation groove, the third rotation groove comprises a fifth slide rail and two sixth slide rails, and the two sixth slide rails are respectively located on two opposite sides of the fifth slide rail and are disposed side by side with the fifth slide rail in a length direction of the fixed base; and the first pressing plate swing arm is mounted in the third rotation groove and is slidable and rotatable along the third rotation groove, and the first pressing plate swing arm is slidably connected to the first pressing plate; and the second pressing plate swing arm is mounted in the fourth rotation groove and is slidable and rotatable along the fourth rotation groove, and the second pressing plate swing arm is slidably connected to the second pressing plate.
A foldable electronic device, comprising a first housing, a second housing, a display screen, and the rotating mechanism according to any one of claims 1 to 14, the rotating mechanism is connected between the first housing and the second housing, the display screen is mounted on the first housing, the second housing, and the rotating mechanism, and when the rotating mechanism rotates, the first housing and the second housing rotate relative to each other, to drive the display screen to bend or unfold.

Description

This application claims priority to Chinese Patent Application No. 202211145993.2, filed with the China National Intellectual Property Administration on September 20, 2022 and entitled "ROTATING MECHANISM AND FOLDABLE ELECTRONIC DEVICE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of electronic product technologies, and in particular, to a rotating mechanism and a foldable electronic device. BACKGROUND With the development of science and technologies, an appearance (ID) form of an electronic device (such as a cellphone or a tablet computer) tends to develop from a bar-type machine to a foldable machine. The foldable machine has a large-area screen in an open state and therefore fully meets visual experience of a consumer; and has a small volume in a closed state and therefore is easy to carry. Most foldable machines in the conventional technology implement synchronous movement through synchronization gears in synchronization mechanisms. However, most existing synchronization gears are in spur tooth structures and therefore have poor transmission stability. SUMMARY This application provides a rotating mechanism and a foldable electronic device, to resolve a technical problem of poor transmission stability of a rotating mechanism in the conventional technology. According to a first aspect, this application provides a rotating mechanism, including a fixed base, a first synchronization swing arm, a second synchronization swing arm, and a synchronization gear. The synchronization gear includes a first gear, a second gear, and an intermediate gear. The first gear, the intermediate gear, and the second gear are all helical gears. The first gear, the intermediate gear, and the second gear are disposed side by side and in parallel. The intermediate gear is located between the first gear and the second gear and engages with the first gear and the second gear. The first synchronization swing arm is fastened to the first gear, and the second synchronization swing arm is fastened to the second gear. The synchronization gear is mounted in the fixed base and is rotatably connected to the fixed base. The first synchronization swing arm and the second synchronization swing arm are respectively located on two opposite sides of the fixed base in a width direction. A rotation direction of the first synchronization swing arm is opposite to a rotation direction of the second synchronization swing arm. A rotation direction of the first gear is opposite to a rotation direction of the second gear. The rotating mechanism is applied to a foldable electronic device, and the foldable electronic device includes a first housing, a second housing, and a display screen. The first housing is connected to the first synchronization swing arm, and the second housing is connected to the second synchronization swing arm. The rotating mechanism is located between the first housing and the second housing and enables the first housing to be rotatably connected to the second housing. Rotation of the rotating mechanism can drive the first housing and the second housing to rotate relative to each other. Accommodation grooves are further disposed in the first housing and the second housing. The accommodation grooves are configured to accommodate electronic components such as a processor, a circuit board, and a camera module, and a structural component of the electronic device. When the rotating mechanism is in a folded state, the first synchronization swing arm folds relative to the second synchronization swing arm. To be specific, the first synchronization swing arm and the second synchronization swing arm rotate in a direction close to each other, so that the first synchronization swing arm and the second synchronization swing arm are stacked. When the rotating mechanism is in a flattened state, the first synchronization swing arm and the second synchronization swing arm flatten relative to the fixed base, and an angle between the first synchronization swing arm and the second synchronization swing arm is approximately 180 degrees. In this embodiment, the first gear, the intermediate gear, and the second gear are all disposed as helical gears, so that contact ratios between the intermediate gear and the first gear and the second gear are increased, thereby improving transmission stability of the synchronization gear, and improving rotation stability of the rotating mechanism. In addition, the first gear, the intermediate gear, and the second gear are disposed as helical gears, so that a tooth root can be further prevented from being broken, thereby improving an impact resistance capability and a bearing capability of the rotating mechanism, and improving durability of the rotating mechanism. In addition, after the contact ratios of the synchronization gear are increased, when a continuous transmission condition is met, based on an actual application scenario, a gear module may be ap