WO2017221486A1

WO2017221486A1 - Seat slide device

Info

Publication number: WO2017221486A1
Application number: PCT/JP2017/011368
Authority: WO
Inventors: 俊之田中
Original assignee: シロキ工業株式会社; アイシン精機株式会社
Priority date: 2016-06-24
Filing date: 2017-03-22
Publication date: 2017-12-28
Also published as: JP2017226387A; JP6591360B2

Abstract

A seat slide device (10) includes a first rail (20), a second rail (30), and a lock lever (40). The lock lever is mounted to the second rail so as to be rotatable about a rotary shaft (43), and engages the first rail and the second rail. The first rail has a plurality of engagement portions (24b, 124b) which are engaged with engagement protrusions (45, 145) of the lock lever. The engagement protrusions have a first side surface (45a, 145a) that is close to the rotary shaft and a second side surface (45b, 145b) that is far from the rotary shaft. The engagement portions of the first rail have a first surface (71) that is engaged with the first side surface and a second surface (72) that is engaged with the second side surface. The first surface and/or the second surface has curved portions (71a, 72a) which are curved so as to bulge toward the engagement protrusion from the rotary shaft.

Description

Seat slide device

The present invention relates to a seat slide device.

Conventionally, a seat slide device for adjusting the position of a seat in a vehicle is known (see, for example, Patent Document 1).
The seat slide device includes a lower rail extending in the longitudinal direction, an upper rail that moves relative to the lower rail, and a lock lever that is attached to the upper rail and engages the lower rail and the upper rail. The lower rail is fixed to the vehicle floor. A seat is fixed to the upper rail. The lower rail has engaging portions arranged at equal intervals along the longitudinal direction. The engaging protrusion of the lock lever engages with this engaging portion. The engagement protrusion of the lock lever can be disposed at a position to engage with the engagement portion by rotation of the lock lever. When the engagement protrusion is disposed at a position where the engagement protrusion is engaged with the engagement portion, the relative movement between the lower rail and the upper rail is restricted by the engagement. As described in Patent Document 1, for example, the engaging portion is configured as a concave portion through which the engaging protrusion is inserted.

JP 2012-111379 A

By the way, the engagement protrusion is disposed at a position to engage with the engagement portion by the rotation of the lock lever, and the engagement between the upper rail and the lower rail is stable even if the engagement protrusion and the engagement portion are engaged. There are things that do not.

To achieve the above object, a seat slide device according to an aspect of the present disclosure includes a first rail extending in the longitudinal direction, a second rail, and a lock lever. The second rail is attached to be movable relative to the first rail. The lock lever has an engaging protrusion. The lock lever is attached to the second rail so as to be rotatable about a rotation axis, and engages the first rail and the second rail. The first rail has a plurality of engaging portions that engage with engaging protrusions of the lock lever. Each of the plurality of engaging portions is configured such that the engaging protrusion is inserted by rotation of the lock lever. The engagement protrusion has a first side surface close to the rotation shaft and a second side surface far from the rotation shaft. Each of the plurality of engaging portions includes a first surface that engages with a first side surface of the engaging projection, a second surface that engages with a second side surface of the engaging projection, and the engaging projection that is inserted therethrough. Opening. At least one of the first surface and the second surface has a curved portion that curves so as to bulge in a direction from the rotating shaft toward the engagement protrusion.

The side view of the seat slide apparatus carrying a sheet | seat. The perspective view of the seat slide apparatus of FIG. FIG. 3 is an exploded perspective view of the seat slide device of FIG. 2. FIG. 2 is a cross-sectional view of the rail along the line AA in FIG. 1. Sectional drawing which follows the BB line of FIG. Sectional drawing which follows the BB line of FIG. The front view which looked at the engaging part toward the arrow C direction of FIG. The schematic diagram of the engaging part of FIG. The schematic diagram of the engaging part in a comparative example which shows an example of an engagement state with an engaging protrusion. The schematic diagram of the engaging part in a comparative example which shows the other example of an engagement state with an engaging protrusion. The schematic diagram of the engaging part in a comparative example which shows the other example of an engagement state with an engaging protrusion. The schematic diagram of the engaging part of FIG. 7 which shows an example of an engagement state with an engaging protrusion. The schematic diagram of the engaging part which shows the other example of an engagement state with an engaging protrusion. The schematic diagram of the engaging part which shows the other example of an engagement state with an engaging protrusion. Sectional drawing of the rail about the seat slide apparatus which concerns on other embodiment. The front view of an engaging part about the seat slide apparatus of FIG.

The seat slide device will be described with reference to FIGS.
With respect to the seat slide device, the direction along the front-rear direction of the vehicle when installed on the vehicle floor is called “front-rear direction DY”, the direction along the width direction of the vehicle is called “width direction DX”, and the direction along the vehicle up-down direction Is referred to as “vertical direction DZ”. The longitudinal direction DY of the seat slide device coincides with the “longitudinal direction” of the lower rail and the upper rail in the seat slide device. The vertical direction DZ is a direction perpendicular to the front-rear direction DY and the width direction DX.

As shown in FIG. 1, the seat slide device 10 has a seat 2 and is attached to the vehicle floor 1. The seat slide device 10 can move the seat 2 relative to the vehicle floor 1 and fixes the seat 2 at a predetermined position in the front-rear direction DY.

As shown in FIG. 2, the seat slide device 10 includes a pair of rails 11 and an operation handle 51.
Each of the pair of rails 11 includes a lower rail 20 as a first rail and an upper rail 30 as a second rail, and a lock lever 40 that can be engaged with the lower rail 20. The lower rail 20 is fixed to the vehicle floor 1. The lower rail 20 extends in the longitudinal direction. The pair of lower rails 20 are arranged at a predetermined interval in the width direction DX. Further, each of the lower rails 20 is disposed such that the longitudinal direction thereof is along the front-rear direction DY.

The upper rail 30 is attached to each lower rail 20 so as to be relatively movable in the longitudinal direction. Each upper rail 30 has a shape extending in the longitudinal direction. The seat 2 is fixed on each upper rail 30. An operation handle 51 for adjusting the position of the seat 2 in the front-rear direction DY is attached to the pair of upper rails 30. In the seat slide device 10, the upper rail 30 can be moved relative to the lower rail 20 by pulling the operation handle 51 upward. Hereinafter, a state in which the upper rail 30 is movable relative to the lower rail 20 is referred to as an “unlocked state” of the rail 11, and a state in which the upper rail 30 is fixed to the lower rail 20 is referred to as a “locked state of the rail 11. "

Hereinafter, the structure of the seat slide device 10 will be described in detail.
As shown in FIGS. 3 and 4, the lower rail 20 includes a bottom wall portion 21 fixed to the vehicle floor 1. Outer wall portions 22 are erected on both ends of the bottom wall portion 21 in the width direction DX, respectively. A folded portion 23 that is folded back inward in the width direction DX extends from the upper end of each of the outer wall portions 22. The folded portion 23 includes an upper wall portion 23a that extends inwardly in the lower rail 20 from the outer wall portion 22, and an inner wall portion 23b that extends downward (in the direction toward the bottom wall portion 21) from the upper wall portion 23a.

A plurality of lock holes 24 extending in the vertical direction DZ are provided in each folded portion 23 so as to be arranged at equal intervals in the longitudinal direction of the lower rail 20. The lock hole 24 extends from the upper wall portion 23a to the inner wall portion 23b. A portion of the lock hole 24 located on the upper wall portion 23a opens upward. A portion of the lock hole 24 located at the inner wall portion 23b extends in the up-down direction DZ, opens toward the side wall portion 32 of the upper rail 30, and is configured to engage with an engagement protrusion 45 of the lock lever 40 as described later. Has been. Hereinafter, the portion of the lock hole 24 positioned at the upper wall portion 23a is referred to as the “opening portion 24a” of the lock hole 24, and the portion of the lock hole 24 positioned at the inner wall portion 23b is “ It is referred to as “engagement portion 24b”.

The upper rail 30 has a plate-like upper wall portion 31, a side wall portion 32 extending downward from both ends in the width direction DX of the upper wall portion 31, and a folded portion 33 folded outward from the lower end portion of the side wall portion 32. With. The pair of side wall portions 32 of the upper rail 30 is disposed between the pair of folded portions 23 of the lower rail 20. The upper wall part 31, the side wall part 32, and the folded part 33 can be integrally formed. The folded portion 33 is disposed in a space surrounded by the outer wall portion 22 and the folded portion 23 of the lower rail 20. Thereby, the relative movement of the upper rail 30 in the vertical direction DZ and the width direction DX with respect to the lower rail 20 is restricted.

A plurality (four in this embodiment) of retainers 52 including ball-shaped rolling elements are attached between the outer wall portion 22 of the lower rail 20 and the folded portion 33 of the upper rail 30. As the rolling element rolls in sliding contact with the outer wall portion 22 of the lower rail 20 and the folded portion 33 of the upper rail 30, the lower rail 20 and the upper rail 30 smoothly move relative to each other.

A plurality (three in this embodiment) of

insertion holes

34a, 34b, and 34c are provided in each side wall portion 32 of the upper rail 30. These insertion holes 34 a to 34 c are arranged at equal intervals in the front-rear direction DY, and the intervals are equal to the intervals of the lock holes 24. Further, the insertion holes 34a to 34c are configured to extend in the vertical direction DZ. Insertion holes 35 are formed in front side portions of the respective side wall portions 32 of the upper rail 30 with respect to the insertion holes 34a to 34c.

The same number (three in this embodiment) of engaging

grooves

36a, 36b, and 36c as the insertion holes 34a to 34c are provided at the upper end of each folded portion 33 of the upper rail 30. These engagement grooves 36a to 36c are arranged at equal intervals in the front-rear direction DY, and the intervals are equal to the intervals of the insertion holes 34a to 34c and the interval of the lock holes 24. Each of the engagement grooves 36a to 36c has a shape in which the tip of the folded portion 33 is cut out in a substantially square shape, and is provided at a position facing each of the insertion holes 34a to 34c in the width direction DX.

A lock lever 40 is attached to the inside of the space surrounded by the pair of side wall portions 32 and the upper wall portion 31 of the upper rail 30 (hereinafter, “inside the upper rail body”). The lock lever 40 includes a main body 41 formed in a long plate shape extending in the front-rear direction DY.

As shown in FIG. 3, a pair of rotary shafts 43 that protrude outward from both sides in the width direction DX are provided at an intermediate portion of the main body 41 of the lock lever 40 in the front-rear direction DY. Then, the lock lever 40 is attached to the upper rail 30 in a state where the rotation shaft 43 is inserted into the insertion hole 35 of the upper rail 30, so that the lock lever 40 is rotatably supported by the upper rail 30.

Further, a plurality (six in this embodiment) of engagement protrusions 45 are provided on the rear end (rear end 44) of the main body 41 of the lock lever 40. The engagement protrusion 45 protrudes outward from both sides in the width direction DX of the rear end portion 44. The engagement protrusion 45 has a first side surface 45a facing the rotation shaft 43, a second side surface 45b facing in a direction opposite to the direction facing the rotation shaft 43, an upper surface 45c, and a lower surface 45d (see FIG. 7). The first side surface 45 a and the second side surface 45 b are orthogonal to the longitudinal direction of the lower rail 20 when the extending direction of the lock lever 40 is arranged to be parallel to the longitudinal direction of the lower rail 20. At least one of the plurality of engagement protrusions 45 (for example, the pair of engagement protrusions 45 in the foremost row on both sides of the lock lever 40) has a width length (length along the front-rear direction DY) of other engagement protrusions 45. It is comprised so that it may become longer than the width length of the joint protrusion 45. FIG. Hereinafter, the engagement protrusion 45 having a long width is referred to as “main engagement protrusion 45m”, and the other engagement protrusion 45 is referred to as “sub-engagement protrusion 45s”. Due to the size relationship of the width of the engagement protrusion 45, the main engagement protrusion 45m mainly engages with the engagement portion 24b of the lower rail 20 in normal use of the seat slide device 10. The sub-engaging protrusion 45s mainly engages with the engaging portion 24b of the lower rail 20 when the upper rail 30 is accelerated and moved with respect to the lower rail 20 (for example, when a vehicle collides). As a result, the force applied to the main engagement protrusion 45 m during acceleration movement of the upper rail 30 is distributed to the plurality of engagement protrusions 45.

These engaging projections 45 are arranged at equal intervals in the front-rear direction DY, and the interval in the front-rear direction DY is equal to the interval between the insertion holes 34 a to 34 c and the interval between the lock holes 24. Then, the lock lever 40 is attached to the upper rail 30 with the engaging protrusions 45 inserted into the insertion holes 34a to 34c, respectively. The engagement protrusion 45 reciprocates along the insertion holes 34 a to 34 c when the lock lever 40 is rotated.

The length in the width direction DX of the part having the engagement protrusion 45 in the lock lever 40 is larger than the distance in the width direction DX between the outer surfaces of the pair of side wall portions 32 of the upper rail 30. Therefore, the engagement protrusion 45 of the lock lever 40 protrudes outward of the side wall portion 32 of the upper rail 30 through the insertion holes 34 a to 34 c of the upper rail 30. In the seat slide device 10, the engagement protrusions 45 can enter and exit any of the plurality of lock holes 24 as the engagement protrusions 45 of the lock lever 40 are reciprocated by the rotation of the lock lever 40. It has become.

Specifically, as shown in FIGS. 4, 5, and 6, each engagement protrusion 45 of the lock lever 40 moves downward and enters the lock hole 24 of the lower rail 20 (the solid line in FIG. 4, In the state shown in FIG. 5, each engagement protrusion 45 is locked by engaging the inner surface of the lock hole 24. In particular, the main engagement protrusion 45m has its first side surface 45a and second side surface 45b in contact with and pressing both side surfaces (first side surface 71 and second side surface 72) of the engagement portion 24b of the lock hole 24. Engage with. Thereby, the rail 11 will be in the locked state by which the relative movement in the front-back direction DY with the lower rail 20 and the upper rail 30 is controlled. On the other hand, when each engagement protrusion 45 of the lock lever 40 moves upward and escapes from each lock hole 24 of the lower rail 20 (the two-dot chain line in FIG. 4, the state shown in FIG. 6), The engagement of the engagement protrusions 45 is released, and the rail 11 is in an unlocked state in which relative movement between the lower rail 20 and the upper rail 30 in the front-rear direction DY is allowed.

Further, a spring 53 (see FIG. 3) is disposed between the upper wall portion 31 and the lock lever 40 in the upper rail body. The spring 53 is fixed to the upper rail 30. The lock lever 40 is constantly urged by the spring 53 in a direction in which the rear end portion 44 of the lock lever 40 is moved downward, that is, in a direction in which the lock state is maintained.

The above-described operation handle 51 formed by bending a pipe material is connected to the front end portion (front end portion 46) of the main body portion 41 of the lock lever 40. The operation handle 51 includes an operation portion 51 a disposed in front of the seat 2 and extending in the width direction DX, and a pair of insertion portions 51 b extending along the upper rails 30. The insertion portion 51b extends forward from the front opening 37 of the upper rail 30 with the distal end 51c of the insertion portion 51b being inserted into the upper rail body.

The insertion part 51 b of the operation handle 51 is supported from below by the front end of the spring 53. Due to the biasing force of the spring 53, the insertion portion 51b of the operation handle 51 is biased in a direction in which the insertion portion 51b is moved upward, that is, in a direction in which the locked state is maintained.

Therefore, when the operation handle 51 is not operated, the rail 11 is in a locked state in which the engagement protrusions 45 of the lock lever 40 are engaged with the lock holes 24 of the lower rail 20 by the biasing force of the spring 53. On the other hand, when the operation handle 51 is operated so as to pull the operation portion 51a upward, the tip 51c of the operation handle 51 operates so as to push down the front end portion 46 of the lock lever 40 against the biasing force of the spring 53. The lock lever 40 rotates. As a result, the engagement protrusions 45 provided on the rear end portion 44 of the lock lever 40 move upward to escape from the lock holes 24 of the lower rail 20, and the rail 11 is released from the locked state to the unlocked state. Become.

With reference to FIG.7 and FIG.8, the structure of the engaging part 24b of the lock hole 24 of the lower rail 20 is demonstrated.
FIG. 7 is a front view of the engaging portion 24b viewed from the direction of arrow C in FIG. FIG. 8 is a schematic diagram emphasizing the bending of the bending

portions

71a and 72a and the extending

portions

71b and 72b of the engaging portion 24b. Each of FIGS. 7 and 8 is an example of an engaging portion 24b configured such that later-described

extensions

71b and 72b are curved.

The engaging portion 24b of the lock hole 24 is configured as a concave portion of the inner wall portion 23b. For example, the engagement portion 24 b of the lock hole 24 includes the bottom surface 70, the first surface 71 near the front surface of the bottom surface 70, that is, the rotation shaft 43 of the lock lever 40, and the rear side of the bottom surface 70, that is, the rotation of the lock lever 40. It has the 2nd surface 72 far from the axis | shaft 43, and the opening part 73 which the engaging protrusion 45 penetrates.

When the lock lever 40 is arranged so that the extending direction of the lock lever 40 is parallel to the longitudinal direction of the lower rail 20, the main engaging protrusion 45 m is formed between the first surface 71 and the second surface 72. It is comprised so that it may contact | abut both. In the following, the main engagement protrusion 45m is engaged with the engagement portion 24b in such a state (reference state) that the lock lever 40 is arranged so that the extension direction of the lock lever 40 is parallel to the longitudinal direction of the lower rail 20. The height position (height position in the vertical direction DZ) of the portion where the main engagement protrusion 45m abuts in the engagement portion 24b is referred to as an “engagement reference position PB”.

First, the first surface 71 of the engaging portion 24b will be described.
The first surface 71 has a bending portion 71a and an extension portion 71b extending from the bending portion 71a toward the opening 73, and is inclined forward (toward the rotating shaft 43) as a whole.

As shown in FIG. 8, the bending portion 71 a is bent so as to bulge in the direction DA from the rotation shaft 43 toward the engagement protrusion 45.
Specifically, in the bending portion 71a, an angle θ1 between a surface perpendicular to the longitudinal direction (hereinafter referred to as “reference surface SB”) and a contact surface TA of the bending portion 71a is gradually increased toward the opening 73. To be curved. Further, the contact surface TA at the engagement reference position PB in the bending portion 71 a is inclined toward the rotation shaft 43 toward the opening 73. In the bending portion 71a, the angle θ1 between the contact surface TA and the reference surface SB at the engagement reference position PB is set to a predetermined angle larger than 0 degrees. For example, the angle θ1 can be set to a predetermined value of 3 degrees or more and 15 degrees or less.

For example, the curved portion 71a can be configured as an arc surface. The radius R1 (set radius) of the arc surface is equal to the length from the center CX of the rotation shaft 43 of the lock lever 40 to the first side surface 45a of the main engagement protrusion 45m. A center axis CA of the arc surface is disposed around the rotation axis 43 of the lock lever 40. For example, the center axis CA of the circular arc surface is spaced from the rotation axis 43 around the rotation axis 43 in the direction DJ along the insertion direction DI of the engagement protrusion 45 (that is, lower than the center CX of the rotation axis 43). Located in. With this setting, as described above, the angle θ1 of the contact surface TA at the engagement reference position PB in the bending portion 71a is set to a predetermined angle larger than 0 degrees.

The extension portion 71b can be bent in the same direction as the bending portion 71a (hereinafter referred to as “first configuration”). In this case, the opening 73 of the engaging portion 24b becomes wider and the engaging protrusion 45 can be easily inserted as compared with a structure in which the extending portion 71b is not curved. Instead of this configuration, the extension 71b can be configured linearly without being curved. In this case, the structure of the engaging portion 24b is simplified. Further, as shown in FIG. 8, the extension portion 71b can be bent in a direction opposite to the bending portion 71a. In this case, in the lower rail 20, the width length LY (length in the longitudinal direction; see FIG. 3) between the engaging portions 24b is longer than that in the first configuration, so that the portion (the portion between the engaging portions 24b) Strength increases. As described above, the extension portion 71b is configured in any of the above-described three forms. The selection is determined based on the strength between the engaging portions 24b, the ease of inserting the engaging protrusions 45, and the like.

Next, the second surface 72 of the engaging portion 24b will be described.
The second surface 72 includes a curved portion 72a and an extended portion 72b extending from the curved portion 72a toward the opening 73, and is inclined rearward (opposite to the rotation shaft 43) as a whole.

As shown in FIG. 8, the bending portion 72 a is bent so as to bulge in the direction DA from the rotation shaft 43 toward the engagement protrusion 45.
Specifically, the curved portion 72 a is curved so that the angle θ <b> 2 between the contact surface TB and the reference surface SB gradually decreases toward the opening 73. Further, the contact surface TB at the engagement reference position PB in the curved portion 72 a is inclined toward the opening 73 toward the side opposite to the rotation shaft 43. In the curved portion 72a, an angle θ2 between the contact surface TB and the reference surface SB at the engagement reference position PB is set to a predetermined angle larger than 0 degrees. The angle θ2 between the contact surface TB and the reference surface SB at the engagement reference position PB in the bending portion 72a is between the contact surface TA and the reference surface SB at the engagement reference position PB in the bending portion 71a. The size is set equal to the angle θ1.

For example, the curved portion 72a can be configured as an arc surface. The radius R2 (set radius) of the arc surface is equal to the length from the center CX of the rotation shaft 43 of the lock lever 40 to the second side surface 45b of the main engagement protrusion 45m. A center axis CB of the arc surface is disposed around the rotation axis 43 of the lock lever 40. For example, the center axis CB of the arc surface is spaced from the rotation shaft 43 around the rotation shaft 43 in a direction opposite to the direction DJ along the insertion direction DI of the engagement protrusion 45 (that is, from the center CX of the rotation shaft 43). Located on the upper side. With this setting, as described above, the angle θ2 of the contact surface TB at the engagement reference position PB in the bending portion 72a is set to a predetermined angle larger than 0 degrees.

The extension portion 72b can be bent in the same direction as the bending portion 72a (hereinafter referred to as “second configuration”). In this case, since the width (length in the longitudinal direction) between the engaging portions 24b in the lower rail 20 is longer than the structure in which the extension portion 72b is not curved, the strength of the portion (the portion between the engaging portions 24b) is increased. Get higher. Instead of this configuration, the extension 72b can be configured linearly without being curved. In this case, the structure of the engaging portion 24b is simplified. Further, as shown in FIG. 8, the extension portion 72b can be bent in the direction opposite to the bending portion 72a. In this case, the opening 73 of the engaging portion 24b becomes wider and the engaging protrusion 45 can be easily inserted as compared with a structure in which the extended portion 72b is not curved. In this way, the extension 72b is configured in any one of the three forms described above. The selection is determined based on the strength between the engaging portions 24b, the ease of inserting the engaging protrusions 45, and the like.

The width length between the first surface 71 and the second surface 72 at the engagement reference position PB (hereinafter referred to as “reference width length LB”) is set to be equal to the width length LW of the main engagement protrusion 45m. Has been. In addition, the width LW of the end near the opening 73 in the engaging portion 24b is larger than the width LW of the main engaging protrusion 45m. The width between the first surface 71 and the second surface 72 (distance along the longitudinal direction) gradually increases toward the opening 73.

With reference to FIGS. 9 to 11, the structure of the engaging portion 100 of the comparative example and the engagement between the engaging protrusion 95 and the engaging portion 100 will be described.
As shown in FIG. 9, in the engaging portion 100 of the comparative example, the first surface 111 and the second surface 112 are configured as flat inclined surfaces. The first surface 111 is inclined forward toward the opening 113. The second surface 112 is inclined rearward toward the opening 113. The angle θ1 of the first surface 111 with respect to the reference surface SB and the angle θ2 of the second surface 112 with respect to the reference surface SB are equal. The reference width length LB is set to a length equal to the width length LW of the engagement protrusion 95.

When the lock lever 40 is in the locked position, the engagement protrusion 95 inserted through the engagement portion 100 engages with the engagement portion 100 at the engagement reference position PB. In this engaged state, an angle φ10 between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, the second side surface 95b of the engaging protrusion 95, and the second side of the engaging portion 100. The angle φ20 to the surface 112 is equal. Therefore, the frictional force between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, the second side surface 95b of the engaging protrusion 95, and the second surface 112 of the engaging portion 100 are The frictional force difference between them is equal, and the engagement between the engagement protrusion 95 and the engagement portion 100 is stable.

Incidentally, the width LW of the engaging protrusion 95 varies in manufacturing. Further, the shape of the engaging portion 100 also varies. In addition, the width LW of the engagement protrusion 95 and the shape of the engagement portion 100 can change depending on the long-term use or use environment of the rail 11. Accordingly, the reference width length LB of the engaging portion 100 and the width length LW of the engaging protrusion 95 may not be equal. Examples thereof will be described below.

FIG. 10 shows an example in which the width LW of the engaging protrusion 95 is longer than the reference width LB of the engaging portion 100. In this case, when the engagement protrusion 95 of the lock lever is inserted into the engagement portion 100, the engagement protrusion 95 is first at a position higher than the engagement reference position PB in the engagement portion 100 (position closer to the opening 113). Engage with the surface 111 and the second surface 112. At this time, the lock lever 40 is inclined with respect to the lower rail 20. In this engaged state, the angle φ1 between the first side surface 95a of the engaging projection 95 and the first surface 111 of the engaging portion 100 is the second side surface 95b of the engaging projection 95 and the second side of the engaging portion 100. It becomes smaller than the angle φ2 between the surface 112. That is, the angle φ1 between the first side surface 95a of the engagement protrusion 95 and the first surface 111 of the engagement portion 100 is smaller than the angle φ10 in the engagement at the engagement reference position PB. The angle φ2 between the second side surface 95b and the second surface 112 of the engaging portion 100 is larger than the angle φ20 in the engagement at the engagement reference position PB. As a result, the angle φ1 between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, the second side surface 95b of the engaging protrusion 95, and the second surface 112 of the engaging portion 100 are determined. The angle difference (φ1−φ2) with the angle φ2 is larger than the angle difference (φ10−φ20) at the engagement reference position PB (see FIGS. 9 and 10).

Therefore, the frictional force between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, the second side surface 95b of the engaging protrusion 95, and the second surface 112 of the engaging portion 100 are The frictional force between the engagement protrusion 95 and the engagement portion 100 becomes unstable.

FIG. 11 shows an example in which the width LW of the engaging protrusion 95 is shorter than the reference width LB of the engaging portion 100. In this case, when the engagement protrusion 95 of the lock lever is inserted into the engagement portion 100, the engagement protrusion 95 is first at a position lower than the engagement reference position PB in the engagement portion 100 (a position closer to the bottom surface portion 110). Engage with the surface 111 and the second surface 112. At this time, the lock lever 40 is inclined with respect to the lower rail 20. In this engaged state, the angle φ1 between the first side surface 95a of the engaging projection 95 and the first surface 111 of the engaging portion 100 is the second side surface 95b of the engaging projection 95 and the second side of the engaging portion 100. It becomes larger than the angle φ2 between the surface 112. That is, the angle φ1 between the first side surface 95a of the engagement protrusion 95 and the first surface 111 of the engagement portion 100 is larger than the angle φ10 in the engagement at the engagement reference position PB. The angle φ2 between the second side surface 95b and the second surface 112 of the engagement portion 100 is smaller than the angle φ20 in the engagement at the engagement reference position PB. As a result, the angle φ1 between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, the second side surface 95b of the engaging protrusion 95, and the second surface 112 of the engaging portion 100 are determined. The angle difference (φ1−φ2) with the angle φ2 is larger than the angle difference (φ10−φ20) at the engagement reference position PB (see FIGS. 9 and 11).

10 and 11, when the engagement protrusion 95 and the engagement portion 100 are engaged, the engagement between the lower rail 20 and the upper rail 30 becomes unstable. This instability, for example, appears as an increase or decrease in the operating force when the lock lever 40 is operated by operating the operation handle 51, and affects the operability of the operator.

Note that the phenomenon shown in FIG. 10 also occurs when the reference width length LB of the engaging portion 100 is shorter than the width length LW of the engaging protrusion 95. The phenomenon shown in FIG. 11 also occurs when the reference width length LB of the engaging portion 100 is longer than the width length LW of the engaging protrusion 95. For this reason, even in these cases, the engagement between the engagement protrusion 95 and the engagement portion 100 can be unstable.

Next, with reference to FIGS. 12 to 14, the engagement between the engagement portion 24b and the main engagement protrusion 45m according to the embodiment will be described.
FIG. 12 shows an example in which the reference width length LB is equal to the width length LW of the main engagement protrusion 45m. In this case, when the main engagement protrusion 45m of the lock lever 40 is inserted into the engagement portion 24b, the main engagement protrusion 45m is engaged with the first surface 71 and the second surface 72 at the engagement reference position PB in the engagement portion 24b. Match. Specifically, the lower portion of the first side surface 45a of the main engagement protrusion 45m and the first surface 71 are engaged with each other so as to press each other, and the lower portion of the second side surface 45b of the main engagement protrusion 45m and the second surface 72 are engaged. And engage so as to press each other. At this time, the extension direction of the lock lever 40 is parallel to the longitudinal direction of the lower rail 20, and in the engaged state, the contact surface between the first side surface 45a of the main engagement protrusion 45m and the first surface 71 of the engagement portion 24b. The angle φ10 between TA and the angle φ20 between the second side surface 45b of the main engagement protrusion 45m and the contact surface TB of the second surface 72 of the engagement portion 24b are equal. Therefore, the frictional force between the first side surface 45a of the main engagement projection 45m and the first surface 71 of the engagement portion 24b, the second side surface 45b of the main engagement projection 45m and the second surface of the engagement portion 24b. The difference in frictional force between the main engagement protrusion 45m and the engagement portion 24b is stable.

FIG. 13 shows an example in which the width LW of the main engagement protrusion 45m is longer than the reference width LB. In this case, when the main engagement protrusion 45m of the lock lever 40 is inserted into the engagement portion 24b, the main engagement protrusion 45m is higher than the engagement reference position PB in the engagement portion 24b (position on the opening 73 side). To engage the first surface 71 and the second surface 72. At this time, the extension direction of the lock lever 40 is not parallel to the longitudinal direction of the lower rail 20, and the first side surface 45 a and the second side surface 45 b of the main engagement protrusion 45 m are directed toward the opening 73. It inclines to the rotating shaft 43 side.

When the engaging portion 24b has the structure of the comparative example, as described above, the angle difference (φ1−φ2) in such an engaged state is larger than the angle difference (φ10−φ20) at the engagement reference position PB. Since it expands, its engagement becomes unstable.

On the other hand, the first surface 71 of the engaging portion 24b according to the present embodiment is curved toward the opening 73 so that the angle θ1 with respect to the reference surface SB is increased, and the second surface 72 is the opening 73. Toward the reference surface SB so that the angle θ2 becomes smaller.

Therefore, in this engaged state, the angle φ1 between the first side surface 45a of the main engagement protrusion 45m and the contact surface TA of the first surface 71 of the engagement portion 24b is smaller than the structure of the comparative example. The degree of reduction from the angle φ10 in the engagement at the combined reference position PB is reduced. In addition, the angle φ2 between the second side surface 45b of the main engagement protrusion 45m and the contact surface TB of the second surface 72 of the engagement portion 24b is an engagement at the engagement reference position PB as compared with the structure of the comparative example. The degree of expansion from the angle φ20 in the case becomes small. As a result, the angle φ1 between the first side surface 45a of the main engagement projection 45m and the contact surface TA of the first surface 71 of the engagement portion 24b and the second side surface 45b of the main engagement projection 45m and the engagement portion 24b. The angle difference (φ1−φ2) between the second surface 72 and the contact surface TB with the angle φ2 is smaller than the angle difference (φ1−φ2) in the engaging portion 100 of the structure of the comparative example. Therefore, the frictional force between the first side surface 45a of the main engagement projection 45m and the first surface 71 of the engagement portion 24b, the second side surface 45b of the main engagement projection 45m and the second surface of the engagement portion 24b. 72 and the frictional force between the main engagement projection 45m and the engagement portion 24b are destabilized.

FIG. 14 shows an example in which the width LW of the main engagement protrusion 45m is shorter than the reference width LB. In this case, when the main engagement protrusion 45m of the lock lever 40 is inserted into the engagement portion 24b, the main engagement protrusion 45m is lower than the engagement reference position PB in the engagement portion 24b (position close to the bottom surface portion 70). To engage the first surface 71 and the second surface 72. At this time, the extension direction of the lock lever 40 is not parallel to the longitudinal direction of the lower rail 20, and the first side surface 45 a and the second side surface 45 b of the main engagement protrusion 45 m are directed toward the bottom surface 70. It inclines toward the rotating shaft 43.

On the other hand, the first surface 71 of the engaging portion 24b according to this embodiment has an angle θ1 with respect to the reference surface SB that increases toward the opening 73, and the second surface 72 has a reference toward the opening 73. The angle θ2 with respect to the surface SB is small. That is, the first surface 71 of the engaging portion 24b according to the present embodiment has an angle θ1 with respect to the reference surface SB that decreases toward the bottom surface portion 70, and the second surface 72 relative to the reference surface SB toward the bottom surface portion 70. The angle θ2 is large.

Therefore, in this engaged state, the angle φ1 between the first side surface 45a of the main engagement protrusion 45m and the contact surface TA of the first surface 71 of the engagement portion 24b is smaller than the structure of the comparative example. The degree of expansion from the angle φ10 in the engagement at the combined reference position PB is reduced. In addition, the angle φ2 between the second side surface 45b of the main engagement protrusion 45m and the contact surface TB of the second surface 72 of the engagement portion 24b is an engagement at the engagement reference position PB as compared with the structure of the comparative example. The degree of reduction from the angle φ20 is small. As a result, the angle φ1 between the first side surface 45a of the main engagement projection 45m and the contact surface TA of the first surface 71 of the engagement portion 24b and the second side surface 45b of the main engagement projection 45m and the engagement portion 24b. The angle difference (φ1−φ2) between the second surface 72 and the contact surface TB with the angle φ2 is smaller than the angle difference (φ1−φ2) in the engaging portion 100 of the structure of the comparative example. Therefore, the frictional force between the first side surface 45a of the main engagement projection 45m and the first surface 71 of the engagement portion 24b, the second side surface 45b of the main engagement projection 45m and the second surface of the engagement portion 24b. 72 and the frictional force between the main engagement projection 45m and the engagement portion 24b are destabilized.

In addition, the above effects are similarly achieved in the case of the following configuration. That is, in the embodiment, the relationship between the main engagement protrusion 45m and the engagement portion 24b is shown to alleviate the instability of the engagement. Even when the sub-engagement protrusion 45s is not distinguished, the same effect as in the embodiment is obtained. The reason is that even if the width length LW of the plurality of engagement protrusions 45 is equal, if the first surface 71 and the second surface 72 of the engagement portion 24b are curved as described above, any engagement is possible. This is because the same operation as described above can be obtained in the protrusion 45.

The operation and effect of the seat slide device 10 according to the present embodiment will be described.
(1) As described above, the engaging portion 24 b has the first surface 71 and the second surface 72. The first surface 71 and the second surface 72 have

curved portions

71 a and 72 a, and the

curved portions

71 a and 72 a are curved so as to bulge in the direction DA from the rotating shaft 43 toward the engagement protrusion 45.

The lock lever 40 rotates and the engagement protrusion 45 engages with the engagement portion 24b. Since the engagement protrusion 45 moves based on the rotation of the lock lever 40, its locus becomes an arc. Whereas the locus of movement of the engagement protrusion 45 is an arc, as shown in FIGS. 9 to 11, the first surface 111 and the second surface 112 of the engagement portion 100 engaged with the engagement protrusion 95 are shown. Is flat, depending on the height of the engaging position where the engaging protrusion 95 and the engaging portion 100 engage, the following state is obtained. That is, the angle φ1 between the first side surface 95a of the engaging protrusion 95 and the first surface 111 of the engaging portion 100, and the second side surface 95b of the engaging protrusion 95 and the second surface 112 of the engaging portion 100 are The angle difference (φ1−φ2) with respect to the angle φ2 varies greatly depending on the height of the engagement position. For this reason, variation in engagement force occurs based on a change in the engagement position.

In this regard, in the above-described configuration, the first surface 71 and the second surface 72 of the engaging portion 24b have

curved portions

71a and 72a, and the

curved portions

71a and 72a are directed from the rotating shaft 43 toward the engaging protrusion 45. Curved to bulge into DA. That is, the first surface 71 and the second surface 72 are configured to follow the locus of the engagement protrusion 45. For this reason, compared with the case where both the 1st surface 71 and the 2nd surface 72 are flat, the dispersion | variation in the engagement force based on the change of an engagement position is suppressed.

The effect of suppressing the variation in engagement force will be described.
Due to the dimensional variation of the engaging projection 45 and the dimensional variation of the engaging portion 24b in manufacturing, the variation of the engagement force is caused by the individual rails 11, and the operability between the individual seat slide devices 10 (when unlocked) The magnitude of the required force or the feeling of operation) will be different. In this regard, in the above configuration, when there is a variation in the size of the engagement protrusion 45 and a variation in the size of the engagement portion 24b, the variation in the engagement force can be suppressed when the engagement position of the engagement protrusion 45 changes. As a result, variation in operability among individual seat slide apparatuses 10 is suppressed. That is, according to the above configuration, it is possible to provide the seat slide device 10 with less individual product variation with respect to operability.

The change in the engagement position is not only the dimensional variation of the engagement projection 45 and the dimensional variation of the engagement portion 24b, but also the dimensional change of the engagement projection 45 or the size of the engagement portion 24b due to wear or use environment (air temperature). It can also be caused by changes. For this reason, in the conventional seat slide device 10, the operability between the seat slide devices 10 may change between the initial use and after a long period of use. In this regard, in the above configuration, when the engagement position of the engagement protrusion 45 changes due to a change in the dimension of the engagement protrusion 45 or a change in the size of the engagement portion 24b, variation in the engagement force is suppressed. can do. For this reason, the change of the operativity between the seat slide apparatuses 10 can be suppressed between the initial stage of use and after long-term use. That is, according to the above configuration, it is possible to provide the seat slide device 10 with less deterioration in operability after long-term use.

In addition, this effect is acquired when at least one of the 1st surface 71 and the 2nd surface 72 has the curved part 71a (72a). For this reason, the engaging portion 24b can be configured such that only one of the first surface 71 and the second surface 72 has the curved portion 71a (72a).

(2) In the curved portion 71 a of the first surface 71, the angle θ1 between the surface (reference surface SB) perpendicular to the longitudinal direction of the lower rail 20 and the contact surface TA in contact with the curved portion 71 a gradually increases toward the opening 73. Configured to be large. According to this configuration, the first surface 71 follows the locus of the engagement protrusion 45.

(3) For example, the curved portion 71a of the first surface 71 is configured as an arc surface having a set radius. The center axis of the circular arc surface is disposed around the rotation shaft 43 of the lock lever 40 and is spaced apart in the direction DJ along the insertion direction DI of the engagement protrusion 45 from the rotation shaft 43 around the rotation shaft 43. (Ie, on the lower side). According to this configuration, the angle θ1 between the surface perpendicular to the longitudinal direction (reference surface SB) and the contact surface TA in contact with the curved portion 71a is configured to gradually increase toward the opening 73.

(4) When the lock lever 40 is arranged so that the extension direction of the lock lever 40 and the longitudinal direction of the lower rail 20 are parallel to each other, the engagement protrusion 45 of the lock lever 40 (in the embodiment, the main engagement protrusion 45m). Is in contact with a predetermined portion (the portion corresponding to the engagement reference position PB) of the curved portion 71a of the first surface 71. As shown in FIG. 8, the contact surface TA of the curved portion 71 a at the predetermined portion is inclined toward the rotation shaft 43 toward the opening 73. According to this configuration, when the engagement protrusion 45 is inserted into the engagement portion 24b, the engagement protrusion 45 and the first surface 71 are reliably engaged.

(5) The first surface 71 includes a bending portion 71a and an extension portion 71b extending continuously from the bending portion 71a toward the opening 73. The extension portion 71b is bent to the opposite side to the bending portion 71a.
For example, if the 1st surface 71 is comprised only by the curved part 71a, the opening part 73 will be expanded. If it does so, the width length LY (refer FIG. 3) between the engaging parts 24b will become short, the intensity | strength of the said part may fall, and there exists a possibility that sufficient intensity | strength may not be obtained. In this regard, in the above configuration, the first surface 71 is configured by the curved portion 71a and the extended portion 71b, and the extended portion 71b is configured to bend to the opposite side of the curved portion 71a. The extent to which the width length LY is shortened is suppressed. For this reason, there is no decrease in the strength of the part, or the decrease is suppressed.

(6) In the curved portion 72 a of the second surface 72, the angle θ <b> 2 between the surface (reference surface SB) perpendicular to the longitudinal direction of the lower rail 20 and the contact surface TB in contact with the curved portion 72 a gradually increases toward the opening 73. Configured to be smaller. According to this configuration, the second surface 72 follows the locus of the engagement protrusion 45.

(7) For example, the curved portion 72a of the second surface 72 is configured as an arc surface having a set radius. The central axis of the circular arc surface is arranged around the rotation shaft 43 of the lock lever 40, and in the direction opposite to the direction DJ along the insertion direction DI of the engagement protrusion 45 from the rotation shaft 43 around the rotation shaft 43. It is located at a separated position (ie, the upper side). According to this configuration, the angle θ2 between the surface perpendicular to the longitudinal direction (reference surface SB) and the contact surface TB in contact with the curved portion 72a is configured to gradually decrease toward the opening 73.

(8) When the lock lever 40 is arranged so that the extension direction of the lock lever 40 and the longitudinal direction of the lower rail 20 are parallel to each other, the engagement protrusion 45 of the lock lever 40 (in the embodiment, the main engagement protrusion 45m). Is in contact with a predetermined portion (a portion corresponding to the engagement reference position PB) of the curved portion 72a of the second surface 72. As shown in FIG. 8, the contact surface TB of the curved portion 72 a at the predetermined portion is inclined to the side opposite to the rotating shaft 43 side toward the opening 73. According to this configuration, when the engagement protrusion 45 is inserted into the engagement portion 24b, the engagement protrusion 45 and the second surface 72 are reliably engaged.

(9) The second surface 72 includes a curved portion 72a and an extended portion 72b that continues to the curved portion 72a and extends toward the opening 73. The extension part 72b is bent to the opposite side to the bending part 72a.
For example, if the 2nd surface 72 is comprised only by the curved part 72a, the opening part 73 will shrink | contract and the margin of insertion when the engagement protrusion 45 penetrates the engaging part 24b will become small. If it does so, there exists a possibility that the engagement protrusion 45 may not penetrate the engagement part 24b. In this regard, in the above configuration, the second surface 72 is configured by the curved portion 72a and the extended portion 72b, and the extended portion 72b is configured to bend to the opposite side of the curved portion 72a. The degree of reduction is suppressed. For this reason, the degree of decrease in the margin when the engaging protrusion 45 is inserted into the engaging portion 24b is reduced, and the possibility that the engaging protrusion 45 is not inserted into the engaging portion 24b is suppressed.

(Other embodiments)
-This technique is applicable to the structure of the engaging part 24b engaged with the engaging protrusion 45 which moves along a circular arc track. In the embodiment, the present technology is applied to an engagement structure in which the engagement protrusion 45 and the engagement portion 24b are engaged by the downward movement of the engagement protrusion 45. However, the present technology is described in the present embodiment. The present invention can also be applied to structures other than the engaged structure. For example, the present technology can also be applied to an engagement structure in which the engagement protrusion 45 and the engagement portion 24b are engaged by the engagement protrusion 45 moving upward. Examples thereof will be described below.

Referring to FIGS. 15 and 16, an example of an engagement structure in which the engagement protrusion 145 engages with the engagement portion 124b as the engagement protrusion 145 moves upward will be described. In addition, description is abbreviate | omitted about the same structure as embodiment, The engagement structure which the engagement protrusion 145 and the engaging part 124b engage mainly by the engagement protrusion 145 moving upward is demonstrated.

The rail having this engagement structure includes a lower rail 120, an upper rail 130, and a lock lever 140. The lower rail 120 includes a bottom wall portion 121 that is fixed to the vehicle floor 1. Outer wall portions 122 are erected on both ends of the bottom wall portion 121 in the width direction DX, respectively. At the end of the outer wall 122 on the upper side of the vehicle, a folded portion 123 that is folded inward in the width direction DX is extended. The folded portion 123 is provided with an engaging portion 124b through which the engaging protrusion 145 is inserted and engaged. The engaging portion 124b opens downward and extends in the vertical direction DZ so that the engaging protrusion 145 is inserted from below the engaging portion 124b.

The upper rail 130 includes a plate-like upper wall portion 131, a side wall portion 132 that extends downward from both ends in the width direction DX of the upper wall portion 131, and a folded portion 133 that is folded outward from the lower side of the side wall portion 132. . The pair of side wall portions 132 of the upper rail 130 are disposed between the folded portions 123 of the lower rail 120. The folded portion 133 is disposed in a space surrounded by the outer wall portion 122 and the folded portion 123 of the lower rail 120. A plurality of (three in this embodiment) insertion holes 134 are provided in the side wall 132 of the upper rail 130 from the side wall 132 to the folded portion 133. The lock lever 140 is rotatably supported by the upper rail 130. The lock lever 140 has a plurality of engaging protrusions 145. When the locking protrusion 140 moves upward due to the rotation of the lock lever 140, the locking lever 140 is inserted into the engaging portion 124b of the lower rail 120 from below.

The structure of the engaging portion 124b will be described with reference to FIG. The engaging portion 124b has a structure that is symmetrical in the vertical direction with the engaging portion 24b of the above embodiment.
That is, the engaging portion 124b includes a first surface 171 with which the first side surface 145a of the engaging protrusion 145 is engaged, a second surface 172 with which the second side surface 145b of the engaging protrusion 145 is engaged, and an engaging protrusion 145. And has an opening 173 through which is inserted. The first surface 171 and the second surface 172 have curved portions 171 a and 172 a that are curved so as to bulge in a direction from the rotation shaft of the lock lever 140 toward the engagement protrusion 145. The first surface 171 and the second surface 172 include extension portions 171b and 172b that extend from the bending portions 171a and 172a and bend in a direction opposite to the bending portions 171a and 172a. According to this structure, the effect according to said (1) shown in embodiment is acquired. Since this engaging part 124b has a vertically symmetrical structure with respect to the engaging part 24b shown in the embodiment, it has substantially the same structure. Therefore, the detailed structure of the engaging portion 24b shown in the embodiment can be applied to the engaging portion 124b.

-In this embodiment, the upper rail (2nd rail) to which the lock lever 40 was attached, and the lower rail (1st rail) provided with the engaging part 24b with which the engagement protrusion 45 of the lock lever 40 engages are provided. The present technology is applied to the rail. On the other hand, the present technology can also be applied to a rail having the following configuration. That is, the structure of the rail includes a lower rail (second rail) to which the lock lever 40 is attached and an upper rail (first rail) provided with an engagement portion with which the engagement protrusion 45 of the lock lever 40 is engaged. The present technology can be applied.

Claims

A first rail extending in the longitudinal direction;
A second rail attached to be movable relative to the first rail;
A locking lever having an engaging projection and attached to the second rail so as to be rotatable about a rotation axis and engaging the first rail and the second rail;
The first rail has a plurality of engaging portions with which engaging protrusions of the lock lever engage.
Each of the plurality of engaging portions is configured such that the engaging protrusion is inserted by rotation of the lock lever.
The engagement protrusion has a first side surface close to the rotation shaft and a second side surface far from the rotation shaft,
Each of the plurality of engaging portions includes a first surface that engages with a first side surface of the engaging projection, a second surface that engages with a second side surface of the engaging projection, and the engaging projection that is inserted therethrough. And an opening to be
At least one of the first surface and the second surface has a curved portion that curves so as to bulge in a direction from the rotating shaft toward the engagement protrusion.
At least the first surface of the first surface and the second surface has the curved portion,
The said curved part of the said 1st surface is comprised so that the angle between the surface perpendicular | vertical to the said longitudinal direction and the contact surface which touches the said curved part may become large gradually toward the said opening part. Seat slide device.
At least the first surface of the first surface and the second surface has the curved portion,
The curved portion of the first surface is configured as an arc surface having a set radius,
The central axis of the arc surface is disposed around the rotation axis of the lock lever, and is located at a position spaced apart in the direction along the insertion direction of the engagement protrusion from the rotation axis around the rotation axis. Item 2. A seat slide device according to Item 1.
A portion where the engagement protrusion of the lock lever comes into contact with the curved portion of the first surface when the lock lever is arranged so that the extending direction of the lock lever and the longitudinal direction of the first rail are parallel to each other The seat slide device according to claim 2, wherein a contact surface of the curved portion is inclined toward the rotating shaft toward the opening.
A portion where the engagement protrusion of the lock lever comes into contact with the curved portion of the first surface when the lock lever is arranged so that the extending direction of the lock lever and the longitudinal direction of the first rail are parallel to each other 4. The seat slide device according to claim 3, wherein a contact surface of the bending portion is inclined toward the rotating shaft toward the opening.
At least the first surface of the first surface and the second surface has the curved portion,
The first surface includes the curved portion and an extension portion that extends continuously to the curved portion and extends toward the opening,
The seat slide device according to claim 1, wherein the extension portion is configured to bend to a side opposite to the bending portion.
At least the second surface of the first surface and the second surface has the curved portion,
The said curved part of the said 2nd surface is comprised so that the angle between the surface perpendicular | vertical to the said longitudinal direction and the contact surface which contact | connects the said curved part may become small gradually toward the said opening part. Seat slide device.
At least the second surface of the first surface and the second surface has the curved portion,
The curved portion of the second surface is configured as an arc surface having a set radius,
The central axis of the arc surface is arranged around the rotation axis of the lock lever, and is spaced apart in the direction opposite to the direction along the insertion direction of the engagement protrusion from the rotation axis around the rotation axis. The seat slide device according to claim 1 located.
A portion where the engagement protrusion of the lock lever comes into contact with the curved portion of the second surface when the lock lever is arranged so that the extending direction of the lock lever and the longitudinal direction of the first rail are parallel to each other The seat slide device according to claim 7, wherein a contact surface of the curved portion is inclined toward a side opposite to the rotating shaft side toward the opening.
A portion where the engagement protrusion of the lock lever comes into contact with the curved portion of the second surface when the lock lever is arranged so that the extending direction of the lock lever and the longitudinal direction of the first rail are parallel to each other The seat slide device according to claim 8, wherein a contact surface of the curved portion in the inclined portion inclines toward a side opposite to the rotating shaft side toward the opening.
At least the second surface of the first surface and the second surface has the curved portion,
The second surface includes the bending portion and an extension portion that extends continuously toward the opening portion and extends toward the opening, and the extension portion is configured to bend to the opposite side of the bending portion. The seat slide device according to claim 1.