KR20210152696A - Rear suspension device of a vehicle - Google Patents

Abstract

The present invention relates to a rear suspension apparatus for a vehicle, comprising: a lower arm which connects a wheel carrier and a vehicle body to be rotatable up and down; a vehicle body connection unit which is fixed on the vehicle body above the lower arm; and an elastic buffer unit of which a lower end is mounted on and coupled with the lower arm, and an upper end is coupled with the vehicle body connection unit to be rotatable in a lateral side. The rear suspension apparatus minimizes curved deformation of a spring by varying a direction of supporting an upper end of the spring when the lower arm rotates up and down.

Description

Rear suspension system for vehicle {REAR SUSPENSION DEVICE OF A VEHICLE}

The present invention relates to a rear wheel suspension for a vehicle, and more particularly, to a rear wheel suspension for a vehicle capable of minimizing curved deformation of a spring when a lower arm rotates upward and downward.

In general, a rear wheel suspension for a vehicle is a device that is connected between an axle and a body frame to absorb vibrations or shocks transmitted from a road surface during driving to improve ride comfort and stability of the vehicle.

A conventional rear wheel suspension for a vehicle includes a wheel carrier for rotatably supporting a wheel, a front/rear lower arm and an upper arm disposed in a vehicle width direction with the wheel carrier and rotatably connecting a vehicle body, and between the wheel carrier and the vehicle body. It is provided with a shock absorber that cushions the impact, and is composed of a coil spring disposed between the lower arm and the vehicle body. In addition, a lower seat for supporting the lower end of the spring is configured in the lower arm, and an upper seat for fixing the upper end of the spring is configured in the vehicle body.

However, since the upper end of the conventional coil spring is fixedly coupled to the upper seat, the spring has a structure in which the spring is compressed and deformed in a curved shape when the lower arm is raised. (collision) may occur.

Background art for the present invention is disclosed in Korean Patent Laid-Open No. 10-2000-0060939 (Title of the Invention: Rear Wheel Suspension Device for Vehicle, Publication Date: October 16, 2000).

It is an object of the present invention to provide a rear wheel suspension for a vehicle capable of minimizing curved deformation of the spring by varying the direction in which the upper end of the spring is supported when the lower arm is rotated upward and downward by the impact transmitted from the road surface.

A rear wheel suspension for a vehicle according to the present invention includes a lower arm that rotatably connects a wheel carrier and a vehicle body up and down, a vehicle body connection part fixed to the vehicle body from above the lower arm, and a lower end seated on the lower arm. It is coupled, and the upper end is characterized in that it comprises an elastic buffer portion rotatably coupled to the side to the side.

In addition, an upper end of the elastic buffer unit may be freely rotatably coupled to a lower portion of the vehicle body connection unit.

In addition, the elastic buffer unit is coupled to the lower arm and includes a lower seat having a first seating surface formed thereon, and an upper end of the lower seat is rotatably coupled to a lower portion of the vehicle body connection unit and laterally rotatably coupled to the lower portion. It may include an upper seat formed on the second seating surface, and a spring having a lower end coupled to the first seating surface and an upper end coupled to the second seating surface.

In addition, a spherical fastening groove that is opened downwardly may be formed in a lower portion of the vehicle body connection part, and a spherical ball joint may be provided in an upper portion of the upper seat to be inserted corresponding to the fastening groove.

In addition, the ball joint may be rotated in the direction of the wheel carrier when the lower arm rotates upward, and rotates in a direction opposite to the center of the vehicle body to the wheel carrier when the lower arm rotates downward.

Also, the upper end of the upper seat and the lower end of the ball joint may be connected by a connecting member, and the connecting member may protrude below the fastening groove.

In addition, an elastic member capable of being elastically deformable may be further coupled to the connecting member, and the elastic member has a ring shape surrounding the outer roll of the connecting member, and the upper end and lower end are in close contact with the lower end of the vehicle body connecting unit and the upper seat of the upper seat, respectively. can be

The present invention can minimize the curved deformation of the spring when the lower arm is rotated up and down, thereby preventing the line-to-line contact of the spring and the collision between the spring and surrounding structures, and the coupling state of the spring does not change, so the lower seat and upper seat There is an effect that can improve the mountability between the and spring.

1 is a front view showing a rear wheel suspension for a vehicle according to the present invention.
2 is a front view illustrating a state in which the lower arm is rotated upward by the compression motion of the rear wheel suspension for a vehicle according to the present invention.
3 is an enlarged cross-sectional view of the main part for showing in detail the coupling structure between the fastening groove and the ball joint of the rear wheel suspension for a vehicle according to the present invention.
4 is an operational state diagram illustrating a state in which the elastic buffer unit rotates during a compression motion of the rear wheel suspension for a vehicle according to the present invention.
5 is an operational state diagram illustrating a state in which the elastic buffer unit rotates during a tensile motion of the rear wheel suspension for a vehicle according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

Advantages and features of the present invention, and a method of achieving the same, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited by the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

In addition, in the description of the present invention, when it is determined that related known techniques may obscure the gist of the present invention, a detailed description thereof will be omitted.

1 is a front view for showing a rear wheel suspension for a vehicle according to the present invention, and FIG. 2 is a front view for showing a state in which the lower arm is rotated upward by the compression motion of the rear wheel suspension for a vehicle according to the present invention, FIG. 3 is an enlarged cross-sectional view of essential parts to show in detail the coupling structure between the fastening groove and the ball joint of the rear wheel suspension for a vehicle according to the present invention.

4 is an operational state diagram illustrating a state in which the elastic buffer unit rotates during a compression motion of the rear wheel suspension for a vehicle according to the present invention, and FIG. It is an operation state diagram to show.

1 to 4 , the rear wheel suspension of a vehicle according to the present invention includes a lower arm 100 , a vehicle body connection unit 200 , and an elastic buffer unit 300 . In addition, the rear wheel suspension may further include an upper arm 20 and a shock absorber 30 .

The lower arm 100 rotatably connects the wheel carrier 20 that rotatably supports the wheel of the vehicle and the vehicle body 10 such as a sub frame up and down, and one side of the lower arm 100 is connected to the wheel carrier. It is shaft-coupled to the lower side of 20 so as to be rotatable up and down, and the other connecting part of the lower arm 100 is shaft-coupled to the vehicle body 10 so as to be rotatably up and down.

In addition, an upper arm 20 may be provided above the lower arm 100 , and one side connection part of the upper arm 30 is shaft-coupled to the upper side of the wheel carrier 20 so as to be rotatably up and down, and the upper arm ( 30) is shaft-coupled to the vehicle body 10 so as to be rotatably up and down.

In addition, a bush (not shown) made of an elastic material may be installed at each connection portion between the lower arm 100 and the upper arm 30 , and the front side of the wheel carrier 20 is a trailing arm disposed in the longitudinal direction of the vehicle body. (not shown) may be connected to the vehicle body.

The shock absorber 40 is for buffering the impact generated from the road surface, and buffers the impact transmitted to the lower arm 100 through compression and tension strokes. The shock absorber 40 may be provided with a cylinder, a piston rod, and a piston valve.

The cylinder may have a cylindrical shape in which a pressure chamber is formed, and a working fluid (oil, etc.) is filled in the pressure chamber of the cylinder. The piston rod is provided to be retractable (compression and tension stroke) to the lower part of the cylinder, the upper end of the cylinder is rotatably coupled to the vehicle body 10 , and the lower end of the piston rod is rotatably coupled to the lower arm 100 . .

The piston valve divides the inside of the cylinder into a compression chamber and a tension chamber, and generates a damping force due to the resistance of the fluid while reciprocating in the compression and tension stroke directions within the chamber of the cylinder.

The vehicle body connection part 200 is for rotatably supporting the upper end of the elastic buffer part 300 to be described later, and the vehicle body connection part 200 is spaced apart from the upper part of the lower arm 100 at regular intervals.

Here, a spherical fastening groove 210 is formed in the lower portion of the vehicle body connection part 200 so that a ball joint 340, which will be described later, is coupled correspondingly, and the lower portion of the fastening groove 210 is opened downward.

In addition, a method of forming the mounting hole 11 in the vehicle body 10 and coupling (welding, fitting, etc.) while the vehicle body connection part 200 is inserted into the mounting hole 11 may be used. In this case, the mounting hole The lower end of the vehicle body connection part 200 may be exposed as the lower part of 11 .

The elastic buffer part 300 is coupled with a lower end seated on the lower arm 100 , and the upper end of the elastic buffer part 300 is rotatably coupled to the vehicle body connection part 200 laterally. At this time, the upper end of the elastic buffer unit 300 is freely rotatably coupled to the lower portion of the vehicle body connection unit 200 .

For this purpose, the elastic buffer 300 includes a lower seat 310 coupled to the lower arm 100 , an upper seat 320 coupled to the vehicle body connection unit 200 , and a lower seat as shown in detail in FIG. 3 . It may be provided with a spring 330 installed between the 310 and the upper seat 320 .

The lower seat 310 may be coupled to the upper end or the inside of the lower arm 100 , and the first seating surface 311 may be coupled to the upper portion of the lower seat 310 in a state where the lower end of the spring 330 is seated. ) is formed.

The upper seat 320 is disposed on the upper portion of the lower seat 310 to be spaced apart, and the upper end of the upper seat 320 is rotatably coupled to the lower portion of the vehicle body connection part 200 laterally, and the upper seat 320 ), a second seating surface 321 having a predetermined width is formed at the lower portion of the spring 330 to be coupled thereto.

In addition, the ball joint 340 is connected to the upper portion of the upper seat 320 to correspond to the fastening groove 210 of the vehicle body connection part 200 , and the ball joint 340 is formed to correspond to the fastening groove 210 . have a shape

The spring 330 is for buffering the impact applied to the lower arm 100, and the spring 330 may have a coil spring shape wound while forming a spiral in a cylindrical shape, and the upper and lower ends of the spring 330 are The upper sheet 320 and the lower sheet 310 are coupled to each other in a supported state.

In addition, a coupling structure inserted into the inside of the spring 330 and coupled to the inner circumferential surface of the spring 330 may protrude from the first seating surface 311 of the lower seat 310 , and the second of the upper seat 320 may be protruded. A coupling structure inserted into the inside of the spring 330 and coupled to the inner circumferential surface of the spring 330 may protrude from the seating surface 321 .

When the lower arm 100 rotates upward to compress the spring 330 upward, the ball joint 340 and the upper seat 320 rotate in the direction of the wheel carrier 20 as shown in FIG. 2, and the ball joint 340 The outer peripheral surface of the fastening groove 210 is rotated in a slide manner in a state in close contact with the inner peripheral surface.

At this time, the lower end of the spring 330 is compressed while rising together with the lower arm 100 , and the upper end of the spring 330 is rotated while being compressed to a rotation radius of the lower arm 100 by the rotation of the ball joint 340 .

On the other hand, when the lower arm 100 is rotated downward to tension the spring 330 downward, the ball joint 340 and the upper seat 320 are rotated toward the center of the vehicle body 10, and the ball joint 340 The outer peripheral surface of the fastening groove 210 is rotated in a slide manner in a state in close contact with the inner peripheral surface.

At this time, the lower end of the spring 330 is tensioned while descending together with the lower arm 100 , and the upper end of the spring 330 is rotated while being tensioned to the rotation radius of the lower arm 100 by the rotation of the ball joint 340 .

That is, when the lower arm 100 is rotated upward and downward by the impact transmitted from the road surface, the upper seat 320 supporting the upper end of the spring 330 rotates along the rotation radius of the lower arm 100 . , it is possible to prevent the spring 330 from being twisted in a curved shape when the lower arm 100 is rotated.

If the spring 330 is deformed in a curved shape, the folded portion of the spring 330 may be in line-to-line contact to generate noise and shock or to be damaged, and the unfolded portion of the spring 330 may be in contact with the surrounding structure 1 ) and may cause noise and impact or may be damaged.

In addition, when the spring 330 is deformed in a curved shape, the upper and lower ends of the spring 330 may be separated from the first seating surface 311 and the second seating surface 321 or their positions may be changed, and the spring ( 330), the riding comfort may be deteriorated or noise may be generated due to a defective installation.

On the other hand, the upper end of the upper seat 320 and the lower end of the ball joint 340 may be connected to each other by a connecting member 350 having a predetermined length, and the connecting member 350 connects the ball joint 340 to the fastening groove 210 ) when inserted into the lower portion of the fastening groove 210 protrudes.

In this case, the upper seat 320 connected to the lower end of the connecting member 350 may be spaced apart from the lower portion of the vehicle body connection unit 200 by a predetermined distance, and when the lower arm 100 rotates, the upper seat 320 and the vehicle body connection unit (200) can be prevented from collided.

In addition, the elastic member 360 may be further coupled to the connecting member 350 . The elastic member 360 may be made of an elastic material such as rubber to be elastically deformable, and may have a ring shape in which a hollow is formed in order to couple in a state surrounding the outside of the connection member 350 , The upper end and the lower end are in close contact with the lower end of the vehicle body connection unit 200 and the upper end of the upper seat 320 , respectively.

Since the elastic member 360 is positioned in a state in close contact between the lower end of the vehicle body connection unit 200 and the upper end of the upper seat 320 , foreign substances are introduced between the lower end of the vehicle body connection unit 200 and the upper end of the upper seat 320 . can be prevented from becoming

As a result, the rear wheel suspension for a vehicle according to the present invention can minimize the curved deformation of the spring 330 during the upward rotation (bump) of the lower arm 100, so that the line-to-line contact of the spring 330 and the spring 330 and the surrounding area are minimized. Collision between the structures 1 may be prevented, and since the coupling state of the spring 330 is not changed, mountability between the lower seat 310 and the upper seat 320 and the spring 330 may be improved.

Although specific embodiments of the rear wheel suspension for a vehicle according to the present invention have been described so far, it is apparent that various implementation modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be conveyed limited to the described embodiments, and should be defined by the following claims as well as the claims and equivalents.

That is, it should be understood that the above-described embodiment is illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims; All changes or modifications derived from the concept of equivalents thereof should be construed as being included in the scope of the present invention.

1: Structure 10: Body
11: mounting hole 20: wheel carrier
30: upper arm 40: shock absorber
100: lower arm 200: body connection part
210: fastening groove 300: elastic buffer part
310: lower seat 311: first seating surface
320: upper seat 321: second seating surface
330: spring 340: ball joint
350: connecting member 360: elastic member

Claims (7)

a lower arm rotatably connecting the wheel carrier and the vehicle body up and down;
a vehicle body connection part fixed to the vehicle body from above the lower arm; and
and an elastic buffer part having a lower end coupled to the lower arm while being seated on the lower arm, and an upper end being rotatably coupled to the vehicle body connecting part laterally. According to claim 1, wherein the elastic buffer portion,
A rear wheel suspension for a vehicle, wherein an upper end is freely rotatably coupled to a lower portion of the vehicle body connection part. According to claim 1, wherein the elastic buffer portion,
a lower sheet coupled to the lower arm and having a first seating surface formed thereon;
an upper seat having an upper end rotatably coupled to a lower part of the vehicle body connection part from an upper part of the lower seat and formed on a second seating surface at a lower part;
and a spring having a lower end coupled to the first seating surface and an upper end coupled to the second seating surface. 4. The method of claim 3,
A spherical fastening groove opened downward is formed in the lower part of the vehicle body connection part,
A rear wheel suspension of a vehicle, characterized in that a spherical ball joint is provided on an upper portion of the upper seat to be inserted corresponding to the fastening groove. According to claim 4, wherein the ball joint,
The rear wheel suspension of a vehicle according to claim 1, wherein the lower arm rotates in the direction of the wheel carrier when the lower arm rotates upward, and rotates in a direction opposite to the center of the vehicle body when the lower arm rotates downward. 5. The method of claim 4,
The upper end of the upper seat and the lower end of the ball joint are connected by a connecting member,
The connection member is a rear wheel suspension of a vehicle, characterized in that protruding under the fastening groove. 7. The method of claim 6,
An elastic member capable of being elastically deformable is further coupled to the connecting member,
The elastic member has a ring shape surrounding the outer roll of the connecting member, and the upper and lower ends are in close contact with the lower end of the vehicle body connection part and the upper seat of the upper seat, respectively.

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