Vehicle suspension spring device and vehicle suspension system having the same

Patent metadata

Field	Value
Publication number	US-11890906-B2
Application number	US-202217986599-A
Country	US
Kind code	B2
Filing date	Nov 14, 2022
Priority date	Dec 1, 2021
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

Disclosed are a vehicle suspension spring device and a vehicle suspension system having the same. The vehicle suspension spring device includes a leaf spring unit comprising at least one leaf spring disposed in a lateral direction of a vehicle, a pair of first coupling parts provided at opposite ends of the leaf spring unit in a longitudinal direction and rotatably coupled to a pair of axles on which opposite wheels of the vehicle are mounted, and a pair of second coupling parts provided at two points between the opposite ends of the leaf spring unit in the longitudinal direction to be rotatably coupled to a subframe of the vehicle.

First claim

What is claimed is:

1. A vehicle suspension spring device comprising:
a leaf spring unit including a plurality of leaf springs disposed and connected in a lateral direction of a vehicle, and a connection part provided to connect the plurality of leaf springs;
a pair of first coupling parts provided at opposite ends of the leaf spring unit in a longitudinal direction and rotatably coupled to a pair of axles on which opposite wheels of the vehicle are mounted; and
a pair of second coupling parts provided at two points between the opposite ends of the leaf spring unit in the longitudinal direction to be rotatably coupled to a subframe of the vehicle,
wherein a first coupling part of the pair of first coupling parts is provided at an outer end of an outermost leaf spring of the plurality of leaf springs,
wherein a second coupling part of the pair of second coupling parts is provided between the plurality of leaf springs,
wherein the connection part includes a pair of connection members provided at ends of the plurality of leaf springs corresponding to each other and coupled to each other, and a fastening member for coupling the connection members,
wherein the fastening member is fastened in a front-rear direction of the vehicle to couple the connection members,
wherein an elastic body is provided to elastically support the connection members in the front-rear direction of the vehicle, and includes a first rubber bushing installed in the connection part to support the fastening member,
wherein a rotation shaft is coupled to the subframe in the front-rear direction of the vehicle,
wherein the second coupling part includes a second rubber bushing provided to rotatably support the rotation shaft, and a bushing coupling hole provided on the leaf spring unit so that the second rubber bushing is coupled, and
wherein the second rubber bushing elastically supports the leaf spring unit around the bushing coupling hole and the subframe.

2. The vehicle suspension spring device according to claim 1 , wherein
the leaf spring unit includes a pair of first leaf springs disposed at the opposite ends in the longitudinal direction, and a second leaf spring provided to connect the pair of first leaf springs,
the first coupling part is provided at an outer end of the first leaf spring, and
the second coupling part is provided between the first leaf spring and the second leaf spring.

3. The vehicle suspension spring device according to claim 1 , wherein the leaf spring is made of a fiber-reinforced composite material.

4. A vehicle suspension system comprising:
a subframe of a vehicle;
a pair of axles mounted on opposite wheels of the vehicle; and
a vehicle suspension spring device provided to connect the pair of axles and the subframe;
wherein the vehicle suspension spring device includes:
a leaf spring unit having a pair of first leaf springs, a second leaf spring provided to connect the pair of first leaf springs and disposed in a lateral direction of the vehicle, and a pair of connection parts provided to connect the first leaf springs and the second leaf spring;
a pair of first coupling parts provided at outer ends of the pair of first leaf springs to be rotatably coupled to the axle;
a pair of second coupling parts provided between the first leaf springs and the second leaf spring to be rotatably coupled to the subframe,
wherein a connection part of the pair of connection parts includes a pair of connection members provided at ends of the first leaf spring and the second leaf spring corresponding to each other and coupled to each other, and a fastening member for coupling the connection members,
wherein the fastening member is fastened in a front-rear direction of the vehicle to couple the connection members,
wherein an elastic body is provided to elastically support the connection members in the front-rear direction of the vehicle, and includes a first rubber bushing installed in the connection part to support the fastening member,
wherein a rotation shaft is coupled to the subframe in the front-rear direction of the vehicle, and
wherein the second coupling part includes a second rubber bushing provided to rotatably support the rotation shaft, and a bushing coupling hole provided on the connection part so that the second rubber bushing is coupled.

5. The vehicle suspension system according to claim 4 , wherein
the second rubber bushing is provided at a central portion of the connection part, and
a plurality of the first rubber bushings is provided in the connection part around the second rubber bushing.

6. The vehicle suspension system according to claim 4 , wherein the second rubber bushing elastically supports the connection part around the bushing coupling hole and the subframe.

7. The vehicle suspension system according to claim 4 , wherein the first coupling part is coupled to a lower central portion of the axle.

8. The vehicle suspension system according to claim 4 , wherein
the leaf spring unit includes a pair of connection parts provided to connect the pair of first leaf springs and the second leaf spring,
the subframe includes a cross member formed in the lateral direction of the vehicle,
the cross member has a hollow portion therein along a longitudinal direction, and
the vehicle suspension spring device is provided such that the pair of connection parts and a gap between the pair of connection parts are accommodated in the hollow portion.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Kolon Glotech Inc
• Hyundai Mobis Co Ltd

Inventors

• Kim Hyun Soo
• Kim Jae Hun
• Kim Young Ha
• Song Woo Bin
• Kim Dong Won
• Goo Jun Sung

Classifications

• B60G11/08 Primary

  arranged substantially transverse to the longitudinal axis of the vehicle · CPC title

• B60G3/10

  the arm itself being resilient, e.g. leaf spring {(B60G7/003 takes precedence)} · CPC title

• B60G7/001

  Suspension arms, e.g. constructional features (B60G7/006 takes precedence) · CPC title

• F16F1/3683

  Attachments or mountings therefor · CPC title

• B60G11/12 Primary

  Links, pins, or bushes · CPC title