KR-102963663-B1 - RAIL DEVICE FOR VEHICLE SEAT

KR102963663B1KR 102963663 B1KR102963663 B1KR 102963663B1KR-102963663-B1

Abstract

The present invention relates to a rail device for a vehicle seat that can prevent play in the long rail for the forward and backward movement of the seat and improve the operating force. To this end, the present invention provides a rail device for a vehicle seat that, as a vertical clearance control function of the upper bearing, allows the upper bearing to always be kept in a movable, close contact state with the upper plate of the lower rail regardless of the load acting on the lower rail through the upper rail when a passenger is seated, as well as dimensional deviations of the lower rail, thereby eliminating the difference between the operating force when the seat moves forward and when it moves backward, and maximizing the operational sensory quality of the seat forward and backward movement control felt by the seated customer.

Inventors

김천

Assignees

현대트랜시스 주식회사

Dates

Publication Date: 20260512
Application Date: 20250106

Claims (11)

A lower rail in which the lower plate and the upper plate are integrally connected to form a rail space; An upper rail arranged to be movable along the lower rail; A lower movable plate formed at the lower part of the upper rail and arranged within the rail space, with a pair of first bevel surfaces spaced apart formed at the upper part; A lower bearing mounted on the outer surface of the lower movable plate and movably seated on the lower plate portion of the lower rail; A guide bracket mounted on the outer surface of the lower movable plate, having a structure in which a pair of second bevel surfaces are spaced apart at the upper portion; An upper bearing that is movably in close contact with the upper plate of the lower rail; A bearing guide pin having both ends axially mounted on the upper bearing and seated on the first bevel and the second bevel, respectively; and A return spring mounted between the lower moving plate and the guide bracket, providing elastic pressure to both ends of the bearing guide pin and adhering to it; A rail device for a vehicle seat characterized by being composed including
In claim 1, A rail device for a vehicle seat, characterized in that a pair of first inclined planes formed on the lower movable plate and a pair of second inclined planes formed on the guide bracket face each other along the width direction and are formed at the same angle of inclination.
In claim 2, A rail device for a vehicle seat, characterized in that the inclination angle of the first and second inclined planes is formed to be 5° to 6° to prevent the bearing guide pin from coming off.
In claim 2, A rail device for a vehicle seat characterized in that one of a pair of first inclined surfaces formed on the lower movable plate is formed to slope downward toward the front, and the other is formed to slope downward toward the rear.
In claim 2, A rail device for a vehicle seat characterized in that one of a pair of second bevel surfaces formed on the guide bracket is formed to slope downward toward the front, and the other is formed to slope downward toward the rear.
In claim 1, A rail device for a vehicle seat, characterized in that a spring guide is mounted between the lower movable plate and the guide bracket, and the return spring is mounted on the spring guide to provide elastic pressure to both ends of the bearing guide pin and to be in close contact.
In claim 6, The above spring guide is, A rail device for a vehicle seat, characterized by comprising an upper plate that is seated on the upper surface of the lower movable plate and the guide bracket, and side plates that extend downward from both ends of the upper plate to mount the return spring, one of which is fastened to the lower movable plate and the other to the guide bracket.
In claim 7, A rail device for a vehicle seat, characterized in that an elastic hook is formed at the lower end of the side plate portion, which is inserted and fastened into a fastening groove formed at the lower end of the lower movable plate or fastened to be caught on the lower surface of the guide bracket.
In claim 7, A rail device for a vehicle seat, characterized in that the above-mentioned side plate portion has an interference-avoiding cut formed therein to avoid interference with both ends of a bearing guide pin seated on the first bevel and the second bevel.
In claim 7, A rail device for a vehicle seat, characterized in that the upper plate of the spring guide has a bearing exposure hole formed therein so that the upper portion of the upper bearing can protrude to contact the upper plate of the lower rail.
In claim 7, A rail device for a vehicle seat, characterized in that the above-described return spring is adopted as a plate spring, wherein one end is connected to a spring pin fixed to the inner surface of the side plate of the spring guide, and the other end is in close contact to provide elastic pressure to the bearing guide pin.

Description

Rail device for vehicle seat The present invention relates to a rail device for a vehicle seat, and more specifically, to a rail device for a vehicle seat that can prevent play in a long rail for forward and backward movement of the seat and improve operating force. As is well known, automotive seats are basically composed of a seat cushion for seating the passenger's lower body, a seat back for leaning the passenger's upper body, and a headrest for supporting the passenger's neck and head, and are mounted to the floor panel of the vehicle's interior via seat rails so as to be adjustable in forward and backward position. Recently, power long rail devices are being applied to increase the movement stroke of the seat in order to provide convenience, such as moving the seat to a desired position inside the vehicle or automatically moving it to a position that facilitates boarding and alighting. A conventional long rail device is configured to include a lower rail mounted on a floor panel and equipped with a long rail of a predetermined length, an upper rail connected to the lower rail so as to be movable back and forth, and a moving device mounted on the upper rail to move the upper rail along the lower rail, wherein the moving device includes an upper bearing and a lower bearing that are supported to roll on the upper and lower parts of the lower rail. At this time, the upper bearing is a clearance control function for the upper plate of the lower rail, and must be maintained in a movably close contact with the upper plate of the lower rail regardless of the load acting on the lower rail through the upper rail when a passenger is seated, or the dimensional deviation of the lower rail. However, in the case of conventional long rail devices, the rolling motion of the upper bearing is not smooth due to the load acting on the lower rail and dimensional deviations of the lower rail when the seat moves forward or backward, resulting in a difference between the operating force when the seat moves forward and when it moves backward, which ultimately leads to a problem of reduced operational sensitivity of the seat's forward and backward movement control felt by the customer sitting in the seat. FIG. 1 is an exploded perspective view illustrating a rail device for a vehicle seat according to the present invention. FIG. 2 is an assembled perspective view illustrating a rail device for a vehicle seat according to the present invention. FIG. 3 is a longitudinal cross-sectional view illustrating the assembled state of a rail device for a vehicle seat according to the present invention. FIG. 4 is an enlarged side view illustrating a key part of a rail device for a vehicle seat according to the present invention. FIG. 5 is an enlarged side view of a key part showing the angle of inclination of the inclined surface on which the bearing guide pin of the rail device for a vehicle seat according to the present invention is seated. FIG. 6 is a perspective view of a key part showing the direction of action of the elastic pressure of the return spring of a rail device for a vehicle seat according to the present invention. FIG. 7 is a schematic diagram illustrating the principle of setting the angle of inclination of the inclined surface on which the bearing guide pin of a rail device for a vehicle seat according to the present invention is seated. The specific structural or functional descriptions described in the embodiments of this specification are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. Furthermore, the invention should not be interpreted as being limited by the embodiments described in this specification, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In this specification, terms such as "first" and/or "second" may be used to describe various components, but said components are not limited by said terms. For the sole purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named a second component, and similarly, a second component may be named a first component. Where in this specification it is stated that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, or that there may be other components in between. Conversely, where it is stated that a component is "directly connected" or "directly in contact" with another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as "between" and "immediately between,"