JPH04201636A - Seat slide device for vehicle - Google Patents

Abstract

PURPOSE:To permit the smooth slide by setting the radius of curvature of the inner surface of the corner of a lower rail over the radius of an inserted pole and installing each projection for regulating the lateral shift of a roller at both the edges of the rolling contact surface of both rails, in a seat slide device for a vehicle which has a lower rail having a C-figure shaped section and an upper rail having a T-figure shaped section. CONSTITUTION:As for the rail of a seat sliding device, an upper rail 1 having a T-figure shaped section is installed on a lower rail 2 having a C-figure shaped section, and a pole 13 is interposed between the corner part 19 of the lower rail 2 and the aslantly erecting piece of the upper rail 1. Further, a roller 14 is interposed between the lower piece 24 of the upper rail 1 and the basic piece 20 of the lower rail 2, and can be slid. The radius of curvature of the inner surface of the corner 19 of the lower rail 2 is set over the radius of the pole 13. Further, the projections 33 and 34 for regulating the shift in the lateral direction of the roller 14 are projectingly installed on the rolling contact surface between the lower piece 24 of the upper rail 1 and the roller 14 of the basic piece 20 of the lower rail 2.

Description

[Detailed Description of the Invention] Skin! BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slide device for a vehicle, and particularly to a seat slide device in which a lower rail having a substantially C-shaped cross section and an upper rail having a substantially T-shaped cross section, both of which are required to have high peel strength, are combined with each other.

For example, as a seat slide device for a disaster vehicle, the British patent G
B2107575 discloses that, as shown in FIG. 1, an upper rail 1 having a substantially T-shaped cross section and a lower rail 2 having a substantially C-shaped cross section are combined, the lower rail 2 is fixed to the floor of the vehicle, and the upper rail is fixed to the upper rail. Generally used is a structure in which seat holding members are coupled to each other so that the upper rail 1 can be slid in the front and rear directions relative to the lower rail 2. Most of the means for sliding the upper rail relative to the lower rail include rollers and balls inserted between both rails in order to minimize operating force and play as much as possible.

In the example of the seat slide device disclosed in the British Patent Publication shown in FIG. 1, there is a base piece 40 that is fixed to the vehicle floor at the front and rear ends and is horizontal in cross section, and a side piece 4 that rises from the side of the base piece.
1, a lower rail 2 having a lower diagonal piece 42 that extends inward from their upper ends and then faces downward toward the inner side, and a seat holding member that extends upward from the gap between the lower diagonal pieces 42 on both sides and is coupled to the upper part. The upper rail 1 has a base piece 43 that is connected to the base piece 43, and an upright piece 44 on the outside of the U-shaped hook-shaped part connected to the lower end of the base piece 43.
The ball 46 is fitted between the bent part 42a of the lower diagonal piece 42 of the lower rail 2 and the corner part 45 of the lower end of the upright piece 44 of the upper rail 1, and the base piece 40 of the lower rail 2 is assembled as shown in the figure. Rollers 47 are fitted between the upper surface and the lower surface of the lower piece of the U-shaped portion of the upper rail 1. Roller 47
are provided in two rows on the left and right, and are held by one cage 48 to maintain a mutual spacing.

However, in the case of the above configuration, if the radius of curvature of the corner portion 45 on the upper rail l side and the bending portion 42a of the two lower rails changes, the amount of transfer of the ball 46 will not be constant with respect to the relative movement amount of the upper and lower rails.

That is, as shown in FIG. 2, when the radius of the bent portion 42a is larger than the radius of the ball 46 and the radius of the corner portion 45 of the upper rail is smaller, the distance from the center of the ball 46 to the point of contact with the bent portion 42a is The distance is rl, corner part 45
If the distance to the point of contact with the ball 46 is r2, then r,>r2, and if the relative movement amount of the upper rail 1 with respect to the lower rail 2 is l, the movement amount with respect to the relative movement between the ball 46 and the upper rail 1 is 1/2). The amount of movement and the amount of movement of the pole are not the same, and a relative positional deviation occurs between the rollers 47 and the balls 46, resulting in an increase in backlash or a change in the positional relationship.
! JI! If you try to keep it constant according to the J system, stiffness or slipping will occur between the ball and the rail, making the rail movement unsmooth.

Further, as shown in FIG. 3, if the radius of curvature of the curvature 42a of the lower rail 2 is smaller than the radius of the ball 46, and the radius of the corner portion 45 of the upper rail 1 is equal to or larger than the radius of the ball 46, then If the distances to the contact points with the bending part and the corner part are r, , rg, respectively, then r,<
rg and ′l! Contrary to the case in Fig. J2, the amount of relative movement between the upper rail 1 and the ball 46 is smaller than the amount of movement between the lower rail 2 and the ball 46, and a similar problem occurs.

Further, since there is nothing to restrict the lateral movement of the rollers 47, the rollers 47 meander, and as described above, slip occurs due to rolling of the rollers, making the movement of the rails uneven and heavy.

Incidentally, in recent years, as it has become mandatory for automobiles to wear seat belts, there is a strong desire to improve the ease of wearing seat belts. Providing a portion of the seatbelt anchor on the seat is advantageous in that the degree of arching of the belt can be maintained constant regardless of the movement of the seat position. In this case, part of the seat belt anchor is attached to the upper rail of the seat slide device.
Since the upper rail is coupled with a hinge plate having a recliner hinge portion, a large upward force is applied to the upper rail, and when the upper rail receives a large upward force, the upper rail and lower rail are deformed. It is necessary to prevent them from coming out of engagement with each other and peeling off.

However, in the conventional seat slide device explained in FIG.
An upward force is applied to the diagonal lower piece 42 of the lower rail 2 via the ball 46, causing it to bend upward from the bent portion at the upper end, and the U-shaped portion of the upper rail 1 is also stretched, causing the upper rail 1 to separate from the lower rail 2. .

Therefore, if the thickness of the plate material forming the upper and lower rails is increased, processing becomes difficult and the weight also increases. To reduce weight, it is possible to use aluminum plates, but aluminum has low rigidity, and if the shape is the same as one made of steel plates, the dimensions would need to be larger.
Installation space will be increased.

In view of the above-mentioned problems with seat slide devices that require high peel strength, the present inventor developed a design that has a significantly smaller cross-sectional dimension than conventional seat slide devices and is easy to manufacture without increasing the number of component parts. Therefore, we invented and separately proposed a sheet sliding device with high peeling resistance.

FIG. 4 to FIG. 8 are diagrams showing the configuration of the seat slide device. As shown in FIG. 4, the seat slide device has a lower rail 2 fixed to the floor of the vehicle via a bracket 10.11, a hinge plate 4 having a belt anchor part 3 and a recliner hinge part 5. The basic structure includes an upper rail 1 that is connected to a protruding portion and is slidably supported on a lower rail 2 to prevent peeling. The upper rail 1 is fixed to the lower rail 2 by a locking device 28, which will be described later, and becomes slidable in the front-rear direction relative to the lower rail 2 when the locking device 28 is released.

Next, the cross-sectional shapes of the lower rail and the upper rail will be explained with reference to FIG.

The lower rail 2 includes a horizontal base piece 20, side pieces 21 that stand up substantially obliquely from both sides of the base piece, an upper piece 16 that extends inwardly from the tips of both side pieces, and each upper piece. It consists of a diagonally lower piece 22 that descends obliquely outward and downward from the inner end of the piece to form an acute angle.

On the other hand, the upper rail l includes both upper pieces 1 of the lower rail 2.
a vertical base piece 23 that protrudes upward through a slit formed between the base pieces 6 and 6, and a lower piece that is formed on both sides of the lower rail 2 parallel to the base piece 2o of the lower rail 2 from the lower end of the base piece 23. 24, and a diagonal standing piece 25 extending diagonally upward and inward from the tip of the lower piece.
and a hanging piece 32 that descends along the lower rail side piece 21.
an upper corner portion 19 of the lower rail;
The ball 13 is placed between the diagonal standing piece 25 of the upper rail 1, and the lower piece 24 of the lower rail 1 is placed between the base piece 20 of the lower rail and the lower piece 24 of the upper rail l.
A roller 14 is fitted between the rollers 14 so as to be freely transferable.

As shown in FIG.
A lock lever bracket 8 is fixed to the base piece 23 of the lock lever bracket 8, a lock release handle 6 is pivotally supported by the bracket 8, and a lock release handle 6 is fixed to the handle 6', and the lock holes 26 and 27 of both rails are fixed to the handle 6'.
It has a lock lever 7 (Fig. 6.7) that fits into the opening 7, and a lock spring 9 that biases the opening 7 clever 7 in the locking direction.

When the release handle 6 is rotated against the biasing force of the lock spring 9 (counterclockwise in FIG. 6), the lock lever 7 is moved into the lock hole 27 (the seventh
(Fig.), and both rails 1 and 2 are unlocked. As a result, the upper rail 1 can be slid against the lower rail 2.

An excessive sliding device peeling force acts on the belt anchor part 3 provided on the upper rail 1 side (and the upper rail 1 tries to peel off from the lower rail 2, but the upper rail 1
The diagonal standing piece 25 engages with the diagonal lower piece 22 of the lower rail 2, receives this external force, and transmits the external force to the vehicle body side via the lower rail 2.

The above-mentioned upper rail 1 and lower rail 2 are each formed by integral molding of aluminum, for example, by extrusion molding, so that each month constituting each rail is integrally formed. This results in
The thickness is increased at the intersections and corners where bending moments and shear forces are applied, and the thickness is gradually reduced near the tip where less force is applied, and the shape is optional to increase the rigidity of the cross section. can be easily made, thereby achieving equal stress,
Peel strength could be increased with a small cross-sectional area.

In the above configuration, the ball 13 is sandwiched between the corner portion 19 of the lower rail 2 and the inclined piece 25 of the upper rail 1. The ball 13 always contacts the diagonal piece 25 of the upper rail at one point because it is in contact with a flat surface, but it contacts the corner part 19 of the lower rail with a concave curved surface, so the radius of the ball and the corner part Depending on the relationship with the radius of curvature of
Problems such as those described in FIG. 2 may occur.

Further, since no particular consideration is given to the lateral movement of the rollers 14, the above-mentioned meandering and rolling problems of the rollers may occur.

In view of the above-mentioned problems, the present invention solves the problem of roller meandering, It is an object of the present invention to provide a vehicle seat slide device that can prevent slippage due to transfer of balls and rollers and can slide smoothly and reliably.

Means for Solving the Problems In order to solve the above problems, the present invention provides the above-mentioned seat slide device that has been separately proposed by the present inventor, in which the radius of curvature of the inner surface of the upper limit corner portion 19 of the lower rail is in contact with this. While making the radius larger than the radius of the ball 13,
Base piece 20 of lower rail 2 and lower piece 24 of upper rail 1
It is characterized in that protrusions 33 and 34 are provided on the contact surfaces of each of the rollers 14 to restrict the lateral movement of the rollers.

With the above configuration, the ball 13 contacts the inner surface of the corner portion 19 and the diagonal upper piece 25 at one point each.
The distance from the center of the ball 13 to the point where the ball 13 contacts the corner portion and the diagonal upper piece 25 is equal, and each rail 1.2
The amount of movement relative to the upper rail 1 relative to the lower rail 2 is 1/2 of [J]I l, and there is no slip between the ball and both rails, and the ball rolls smoothly.

Furthermore, protrusions 33 and 34 are provided on each surface of the lower piece 24 of the upper rail 1 and the base piece 20 of the lower rail 2, on which the rollers 14 roll, to restrict the lateral movement of the roller I4, so that the roller I4 has more than a predetermined play. The upper rail 1 is prevented from moving in the same direction laterally, and there is no meandering, and the upper rail 1 accurately and smoothly slides in the longitudinal direction with respect to the lower rail 2.

Large Fan - Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 8 is a sectional view of an embodiment in which the present invention is applied to the seat slide device described in FIGS. 4 to 7. Therefore, members having the same functions as those in FIG. 5 are given the same reference numerals, and the explanation will focus on the differences.

FIG. 9 is an enlarged sectional view showing the vicinity of the ball 13 in FIG. 8. As shown in the figure, the radius of curvature R3 of the upper limit corner portion 19 of the lower rail 2 is larger than the radius R of the ball 13. The surface of the diagonal upper piece 25 of the upper rail 1 that contacts the ball 13 is a flat surface. therefore,
The ball 13 contacts the inner surface of the corner portion 19 and the outer surface of the diagonal upper piece 25 at one point. As a result, 1U in ball 13
The respective distances r and rl from the point of contact of the ball 13 with the diagonal upper piece of the upper rail l and the point of contact of the ball 13 with the conina part 19 are equal, and the amount of movement of the ball 13 with respect to each rail 1.2 is equal. The amount is 1/2 of the amount of movement of the upper rail 1 with respect to the lower rail 2. Therefore, the ball 13 does not slip when the upper rail moves, and the upper rail 1 slides smoothly on the lower rail 2.

As shown in FIG. 8, the lower surface of the lower piece 24 of the upper rail l and the upper surface of the base piece 20 of the lower rail 2 are provided with appropriate play relative to the width of the rollers 14, and rollers 14 are placed on both outer sides thereof. Protrusions 34,33 are provided to restrict lateral movement of. Therefore, when the upper rail 1 is slid in the front-rear direction relative to the lower rail 2, the protrusions 34 and 33 prevent the rollers 14 from moving laterally beyond the appropriate play, and the rollers 14 do not meander. Moreover, the upper rail 1 can be slid smoothly and accurately with respect to the lower rail 2 without slipping.

Since both the upper rail 1 and the lower rail 2 are made by integral molding such as extrusion of aluminum, it is easy and accurate to determine the radius of curvature of the corner portion 19 and form the protrusions 33 and 34 for regulating the lateral movement of the rollers. can be done.

As described above, according to the present invention, slipping and meandering of the balls and rollers used as sliding members between the upper rail and the lower rail of a seat slide device of a vehicle, which has a simple structure and high peel strength, can be prevented during transfer. , the upper rail can be slid smoothly and accurately with respect to the lower rail.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the rail of an example of a conventional seat slide device, Figures 2 and 3 are explanatory diagrams explaining the problems, and Figure 4 is an example of a separately proposed seat slide device. FIG. 5 is a cross-sectional view of the rail, FIG. 6 is a cross-sectional view of the part provided with the locking device, FIG. 7 is a perspective view showing the locking hole of the upper rail, and FIG. 8 is a cross-sectional view of the rail according to the present invention. FIG. 9 is an enlarged sectional view of the upper corner corner of the rail of the seat slide device according to the embodiment. l...Upper rail 2...Lower rail 3...
・Part of belt anchor 4...Hinge plate 13...
・Ball 14... Roller 15... Standing piece
16... Upper piece 17... Hanging piece 1
9... Corner part 20... Base piece 21...
・Side piece 22... Oblique lower piece 23... Base piece 24
...Lower piece 25...Slanted piece 33.34.
・・Lateral movement restriction protrusion agent Patent attorney Hideaki Kuwahara Figures 8 and 9

Claims (1)

[Claims] A horizontal base piece (20) fixed to the vehicle floor at its front and rear ends.
and a side piece (21) rising from the side of the base piece (20);
an upper piece (16) extending inward from the upper end of each of the side pieces (21) and forming a slit between the inner ends; A lower rail (2) having a substantially C-shaped cross section and a diagonal lower piece (22) facing toward the
and a base that protrudes upward through a slit formed between both upper pieces (16) of the lower rail (2), and a hinge plate having a recliner hinge portion on the protruding upper part and a seat belt anchor portion are coupled to each other. The piece (23) and the base piece (
23) a lower piece (24) extending from the lower end to both sides in parallel with the base piece (20) of the lower rail; and a diagonal stand extending obliquely upward and inward from the end of the lower rail (24). an upper rail (1) having a generally T-shaped cross section; a lower piece (24) of the upper rail (1) and a lower rail (
A roller (14) is inserted between the base piece (20) of 2),
A corner portion (19) formed by the side piece (21) and the upper piece (16) of the lower rail (2) and the upper rail (
In the vehicle seat slide device in which the ball (13) is fitted between the diagonal piece (25) of 1) and the upper rail (1) is slidable relative to the lower rail (2), the corner of the lower rail as described above is provided. The radius of curvature of the inner surface of the portion (19) is larger than the radius of the ball (13), and the roller (14) of each of the base piece (20) of the lower rail (2) and the lower piece (24) of the upper rail (1) 1. A vehicle seat slide device characterized in that protrusions (33, 34) are provided on the contact surfaces of the rollers (33, 34) for regulating the lateral movement of the rollers.