Sliding structure for vehicle seat

Abstract

The invention provides a sliding structure of a vehicle seat. The sliding structure can suppress increase of cost and is easy to assemble while moving resistance in the sliding direction is different. A sliding structure (SK) for a vehicle seat is provided with: a lower rail (1) attached to a floor (FL) of a vehicle provided with a vehicle seat (ST); an upper rail (2) which is attached to a seat cushion (91) of a vehicle seat (ST) and which slides by engaging with the lower rail (1); and a resistance providing section (3) attached to an end of the upper rail (2). The resistance providing section (3) has: a main body section (31) attached to the end section; a rotating arm section (32) that rotates about an axis (CL3) extending in the width direction of the lower rail (1) with respect to the main body section (31) and enters a gap (H3) between the main body section (31) and a top wall section (12) of the lower rail (1); and a biasing member (34) that biases the rotating arm section (32) in the direction in which the rotating arm section (32) enters the gap (H3).

Description

Technical Field

[0001] The present invention relates to a sliding structure for a seat of a vehicle. Background Art

[0002] Patent Document 1 describes the following structure: In the sliding structure of a seat for a vehicle, the sliding resistance of the upper rail fixed to the seat cushion with respect to the lower rail is smaller when moving backward than when moving forward.

[0003] Prior Art Documents

[0004] Patent Document 1: Japanese Patent No. 7166059 Summary of the Invention

[0005] Technical Problem to be Solved by the Invention

[0006] In the sliding movement of a seat for a vehicle, for example, in the front-rear direction, there are times when it is desired to have different moving resistances when moving forward as the first direction and when moving backward as the second direction opposite thereto. For example, in a large one-box vehicle or the like, the floor on which the seat for the vehicle is provided may become higher toward the rear. Regarding the seat for such a vehicle, it is desired that the moving resistance when moving backward to the higher part is smaller than when moving forward to make the sliding operation of the seat easier.

[0007] Although the sliding structure described in Patent Document 1 can be adopted to meet this desire, the number of components and the assembly process of this sliding structure are large, the cost increases, and the assembly work is also difficult. Thus, regarding the sliding structure of a seat for a vehicle in which the moving resistances are different in the first sliding direction and the second direction opposite thereto, it is desired to have different moving resistances in the sliding direction while suppressing an increase in cost and facilitating the assembly work.

[0008] To solve the above technical problem, the present invention has the following configuration.

[0009] 1) A sliding structure for a seat of a vehicle, comprising:

[0010] A lower rail that is installed on the floor of a vehicle equipped with a seat for a vehicle;

[0011] An upper rail that is installed on the seat cushion of the seat for a vehicle and engages with the lower rail to slide; and

[0012] A resistance providing portion that is installed at an end of the upper rail,

[0013] The resistance providing portion has:

[0014] A main body portion that is installed at the end;

[0015] A rotating arm that rotates relative to the main body about an axis extending in the width direction of the lower rail and enters the gap between the main body and the top wall portion of the lower rail; and

[0016] A force - applying member that applies a force to the rotating arm in the direction of entering the gap.

[0017] 2) In the sliding structure of the vehicle seat according to 1), the rotating arm has a sickle - shaped portion, and the sickle - shaped portion is formed in a sickle shape as the portion entering the gap.

[0018] 3) In the sliding structure of the vehicle seat according to 2), when the upper rail slides relative to the lower rail, the sickle - shaped portion slides while applying a force to the lower surface of the top wall portion by the force generated by the force - applying member.

[0019] 4) In the sliding structure of the vehicle seat according to 2), the sickle - shaped portion is plate - shaped and has a shape that expands from the tip side toward the root. The larger the gap, the more the sickle - shaped portion causes the side of the root to enter the gap.

[0020] 5) In the sliding structure of the vehicle seat according to 1), the resistance - providing portion is installed at the first end of the upper rail, and the resistance when the vehicle seat slides toward the first end side is greater than the resistance when the vehicle seat slides toward the opposite side of the first end.

[0021] Advantages of the Invention

[0022] According to the present invention, the following effects can be obtained: while having different moving resistances in the sliding direction, cost increase is suppressed and assembly work is easy. Description of the Drawings

[0023] Figure 1 It is a left - hand view of a vehicle seat ST of the first embodiment having a sliding structure SK which is an embodiment of the sliding structure of the vehicle seat of the present invention.

[0024] Figure 2 It is a left - hand view showing the upper rail 2 and the resistance - providing portion 3 in the sliding structure SK.

[0025] Figure 3A It is an exploded perspective view of the resistance - providing portion 3.

[0026] Figure 3B It is a perspective view showing a method of installing the resistance - providing portion 3 on the upper rail 2.

[0027] Figure 4 It is a front view of the sliding structure SK.

[0028] Figure 5A It is a left side view showing the first state of the resistance providing portion 3.

[0029] Figure 5B It is a left side view showing the second state of the resistance providing portion 3.

[0030] Figure 6A It is a left side view showing the case where a force is applied to the resistance providing portion 3 when the upper rail 2 moves backward.

[0031] Figure 6B It is a left side view showing the case where a force is applied to the resistance providing portion 3 when the upper rail 2 moves forward.

[0032] Figure 7 It is a left side view showing the second embodiment of the sliding structure SK.

[0033] Figure 8 It is a perspective view showing the sliding structure SKA when the seat ST has the connecting frame 5.

[0034] Figure 9A It is a schematic front view showing the sliding structure SKA1 as the first modification of the sliding structure SKA.

[0035] Figure 9B It is a schematic front view showing the sliding structure SKA2 as the second modification of the sliding structure SKA.

[0036] Figure 9C It is a schematic front view showing the sliding structure SKA3 as the third modification of the sliding structure SKA. Detailed Embodiment

[0037] An embodiment of the sliding structure of the vehicle seat of the present invention is described through the sliding structure SK. The up-down, front-back, and left-right directions in the description are defined by the arrows shown. In addition, the left direction is the front direction of the paper surface of Figure 1 and the right direction is the inner direction of the paper surface of Figure 1 . The left-right direction is also referred to as the width direction. Figure 1

[0038] First, refer to Figure 1 to describe the structural outline of the vehicle seat ST equipped with the sliding structure SK. Figure 1 It is a left side view of the vehicle seat ST.

[0039] As shown in Figure 1As shown, a lower rail 1 extending in the front-rear direction is laid on the floor FL of the vehicle. The vehicle seat ST (hereinafter referred to as the seat ST) includes a seat cushion 91, a seat backrest 92, and a headrest 93. The seat cushion 91 has an upper rail 2 at the bottom, and the upper rail 2 engages with the lower rail 1 to be slidable in the front-rear direction. Thus, the seat ST slides in the front-rear direction on the lower rail 1 (see arrow DR1).

[0040] Figure 2 is a view enlarging the upper rail 2 and the lower rail 1 in Figure 1 The sliding structure SK has an upper rail 2 and a resistance providing portion 3 mounted at its front end.

[0041] Figure 3 is an exploded perspective view of the resistance providing portion 3. As shown in Figure 3, the resistance providing portion 3 includes a main body portion 31, a rotary arm portion 32, a pin 33, a spiral spring 34, and an E-ring 35. The main body portion 31 is formed in a substantially box shape so as to form a space V31 opening upward at the central portion. The main body portion 31 is formed of resin, for example. The main body portion 31 has a through hole 31a that passes through and penetrates the space V31 with the axis CL3 extending in the left-right direction as the center. The opening edge portions of the through hole 31a become seat portions 31b that protrude slightly as annular seats on the left and right sides.

[0042] At the rear of the main body portion 31, a pair of guide pieces 312 separated in the left-right direction and extending rearward and a engaging piece 313 extending rearward longer than the guide pieces 312 at the left-right center below the guide pieces 312 are formed. The tip portion of the engaging piece 313 is formed into a hook-shaped engaging portion 313a.

[0043] At the upper end of the left-right center in the rear portion of the main body portion 31, a columnar locking portion 315 extending upward is formed. The columnar locking portion 315 has a pillar portion 315b extending upward from the main body portion 31 and a pair of locking portions 315c extending in the up-down, front-rear, and rearward directions from the tip of the pillar portion 315b. The pair of locking portions 315c extend in parallel at a prescribed interval d and have through holes 315a with the same axis extending in the left-right direction.

[0044] The main trunk portion 341 of the spiral spring 34 is accommodated in the space V31 at the center of the main body portion 31. The upper surfaces on the left side and the right side of the space V31 in the main body portion 31 are respectively formed into sliding portions 314. The sliding portions 314 are formed into arc-shaped curved surfaces centered on the axis CL3 in a range more forward than the vertical plane CLV including the axis CL3 (see Figure 5A ). Hereinafter, the sliding portion 314 on the left side may be distinguished as the sliding portion 314L and the sliding portion 314 on the right side may be distinguished as the sliding portion 314R.

[0045] The helical spring 34 as a force - applying member is a torsion helical spring that exerts elastic force by being twisted, and has a main body portion 341 wound in a coil shape with the left - right direction as the axial direction and a pair of arm portions 343 extending from the left - and right - end portions. The main body portion 341 includes main body portions 341L and 341R that are separated and connected in the left - right direction. The arm portion 343L is bent from the left end of the main body portion 341L and extends toward the radially outer side. The arm portion 343R is bent from the right end of the main body portion 341R and extends toward the radially outer side.

[0046] The pair of rotating arm portions 32 are plate - like members of the same shape and are formed of, for example, resin. The rotating arm portion 32 has a base portion 32c having a through - hole 32c1, a protruding portion 32a, and a sickle - shaped portion 32b. The protruding portion 32a protrudes from the base portion 32c toward one side in the radial direction, and the sickle - shaped portion 32b is a portion that is bent from the tip of the protruding portion 32a and extends in a sickle shape. A cut - in portion 32d that cuts in from the outer surface 32b2 toward the inside is formed at the boundary portion between the protruding portion 32a and the sickle - shaped portion 32b. The inner surface 32b1 of the sickle - shaped portion 32b is formed in an arc shape with the axis of the through - hole 32c1 as the center, and the outer surface 32b2 is formed by a curved surface whose distance from the axis of the through - hole 32c1 decreases as it approaches the tip in the left - right side view. That is, the sickle - shaped portion 32b is plate - like and has a shape that expands from the tip side toward the root in the side view. The axis of the through - hole 32c1 coincides with the axis CL3 after the assembly of the resistance - providing portion 3.

[0047] The assembly of the resistance - providing portion 3 is carried out as follows. In a state where the helical spring 34 is housed in the space V31, the pin 33 is inserted through the through - hole 32c1 of the left - hand rotating arm portion 32, the through - hole 31a on the left side of the main body portion 31, the main body portions 341L and 341R, the through - hole 31a on the right side of the main body portion 31, and the through - hole 32c1 of the right - hand rotating arm portion 32, and an E - ring 35 is fitted into the circumferential groove 33a at the tip as an anti - detachment device. The arm portion 343L of the helical spring 34 is locked to the cut - in portion 32d of the rotating arm portion 32L, and the arm portion 343R is locked to the cut - in portion 32d of the rotating arm portion 32R. Thus, the pair of rotating arm portions 32 are made to freely rotate relative to the main body portion 31 about the axis CL3, and are urged in the clockwise direction by the helical spring 34 (see Figure 3A the arrow DR2 in Figure 3A and Figure 3B ).

[0048] As shown in the front view of Figure 4 , the lower rail 1 has a bottom wall portion 13, side wall portions 11, and a top wall portion 12, and is in a substantially U - shape with the upper - side center open as a gap 12d. The lower rail 1 is fixed to the floor FL of the vehicle compartment (see Figure 1)。The side wall portions 11 are formed as a pair so as to stand upward from the left and right edge portions of the bottom wall portion 13 respectively. The top wall portion 12 extends in a shape of an eaves with the upper ends of the pair of side wall portions 11 approaching each other in the left - right direction. A gap 12d is formed with the tops of the pair of top wall portions 12 separated from each other in the left - right direction. At the lower portions on the inner surfaces of the pair of side wall portions 11 respectively, there are formed inward - protruding moving slide rail portions 14. The upper surface of the moving slide rail portion 14 is an inclined surface that descends as it faces inward. Additionally, Figure 4 In the case where it is necessary to distinguish between a certain left - right pair of parts, when marking, the left side is marked with L and the right side is marked with R at the end of the symbol. For example, in the moving slide rail portion 14, the left - hand one is the moving slide rail portion 14L and the right - hand one is the moving slide rail portion 14R.

[0049] As Figure 4 shown, the upper rail 2 has a slide rail base 21 and rollers 22. The slide rail base 21 has a base 211 and an upward - protruding portion 212 (see Fig. 3b). The base 211 is buried in the internal space V of the lower rail 1 and is accommodated so as to be movable in the front - rear direction. Rollers 22 are respectively installed at the front and rear portions of the base 211. The left and right end portions of the roller 22 are formed with a larger diameter and are made to rotate while making surface contact with the moving slide rail portions 14L and 14R. Thus, the upper rail 2 moves smoothly in the internal space V of the lower rail 1. In addition, since the moving slide rail portions 14L and 14R have inclined surfaces that descend as they face the center in the left - right direction as described above, and the rollers 22 make surface contact with the moving slide rail portions 14L and 14R, the left - right position of the upper rail 2 is automatically aligned during the movement in the front - rear direction.

[0050] The upward - protruding portion 212 of the upper rail 2 protrudes upward through the gap 12d between the top wall portion 12L and the top wall portion 12R. The upper portion of the upward - protruding portion 212 is connected to the frame (not shown) of the seat cushion 91, and the upper rail 2 moves integrally with the seat cushion 91 in the front - rear direction.

[0051] As shown in Fig. 3b, a through - hole 212a with its central axis extending in the left - right direction is formed near the front end portion of the upward - protruding portion 212 in the upper rail 2. In addition, a pair of void portions 214 as spaces extending in the front - rear direction are formed at symmetric positions on the left and right of the base 211. In addition, at the central portion in the left - right direction on the bottom surface of the base 211, a concave portion 213 with a rectangular cross - section is dug upward with a specified length and faces backward with a specified length. The depth - side portion of the concave portion 213 is made into an engaging portion 213a that is dug deeper than the entrance side.

[0052] The resistance providing part 3 is installed at the front end of the upper rail 2 as follows. As shown in Fig. 3b, a pair of guide pieces 312 in the main body 31 of the resistance providing part 3 are inserted into a pair of gap parts 214 of the upper rail 2, and the engaging piece 313 is engaged with the engaging part 213a along the concave part 213. At the same time, the upper protruding part 212 of the upper rail 2 is inserted between a pair of locking parts 315c of the columnar locking part 315, and the resin clip 36 is fixed through the through hole 315a of the left locking part 315c, the through hole 212a, and the through hole 315a of the right locking part 315c. Thus, the resistance providing part 3 is fixed to the end of the upper rail 2.

[0053] The left side view near the resistance providing part 3 in the state where the upper rail 2 with the resistance providing part 3 installed is assembled to the lower rail 1 is shown in Figures 5A to 6B . In Figures 5A to 6B , although the relationship between the left rotating arm part 32L and the ceiling lower surface 12La is mainly described, the relationship between the right rotating arm part 32R and the ceiling lower surface 12Ra is the same.

[0054] The vertical position of the upper rail 2 in the lower rail 1 is determined by the abutting position of the roller 22 shown in Figure 4 against the moving slide rail part 14. In addition, there is a gap between the slide rail base 21 of the upper rail 2 and the upper part 311a of the base 311 of the resistance providing part 3 and the ceiling lower surface 12La of the top wall part 12L opposed to them above.

[0055] If the gap between the upper part 311a of the base 311 and the ceiling lower surfaces 12La, 12Ra is set as the gap H3 (see Figure 5A ), the rotating arm part 32 of the resistance providing part 3 is urged clockwise around Figure 5A by the spiral spring 34, so that the sickle-shaped part 32b enters the gap H3. That is, the inner surface 32b1 of the sickle-shaped part 32b of the rotating arm part 32 abuts against the sliding part 314 of the base 311 in a surface contact manner, and the outer surface 32b2 of the sickle-shaped part 32b abuts against the ceiling lower surface 12La at the position P. Thus, there is no upward movement of the upper rail 2 relative to the lower rail 1, preventing so-called wobbling.

[0056] The gap H3 is not limited to being fixed and sometimes varies due to deviations in the dimensions of each component, etc. For example, Figure 5B shows the case where a gap H3B smaller (narrower in the vertical direction) than the gap H3 shown in Figure 5A is generated. In this case, also because the rotating arm part 32 rotates around Figure 5BA force is applied in the clockwise direction (see arrow DR2), so that the sickle-shaped portion 32b enters the gap H3B. At this time, since the gap H3B is smaller than the gap H3, the sickle-shaped portion 32b abuts against the lower surface 12La of the ceiling at a position P1 closer to the tip side than the position P of the outer surface 32b2. On the one hand, since the inner surface 32b1 of the sickle-shaped portion 32b is coaxial with the sliding portion 314 of the base portion 311 and has the same radius, it abuts in a surface contact manner. Thus, through the sliding structure SK, regardless of the gap H3, the upward movement, i.e., the wobbling, of the upper rail 2 relative to the lower rail 1 can be well regulated.

[0057] Next, referring to Figure 6A and Figure 6B the function of the resistance providing portion 3 in the front-rear direction movement of the upper rail 2 having the resistance providing portion 3 at the front end portion, i.e., the front-rear direction movement of the seat ST, will be described. Figure 6A It shows the case where Figure 5B the seat ST is slid backward in the state shown, Figure 6B It shows the case where Figure 5B the seat ST is slid forward in the state shown.

[0058] In Figure 6A when the upper rail 2 together with the resistance providing portion 3 slides backward (see arrow DR3), the sickle-shaped portion 32b of the rotary arm portion 32 slides backward on the lower surface 12La of the ceiling, and a dynamic frictional force caused by the biasing force of the coil spring 34 is generated at the position P1. Since this dynamic frictional force is directed forward, it acts as a force that attenuates the clockwise torque T1 around the rotary arm portion 32, and a resistance Fn1 to the movement is applied to the position P1.

[0059] On the other hand, as Figure 6B shown, when the upper rail 2 together with the resistance providing portion 3 slides forward (see arrow DR4), the sickle-shaped portion 32b of the rotary arm portion 32 slides forward on the lower surface 12La of the ceiling, and a dynamic frictional force caused by the biasing force generated by the coil spring 34 is generated at the position P1. Since this dynamic frictional force is directed backward, it acts as a force that assists the clockwise torque T1 of the rotary arm portion 32, and presses the sickle-shaped portion 32b of the rotary arm portion 32 into the gap H3B between the lower surface 12La of the ceiling and the sliding portion 314L as a wedge. Therefore, the resistance applied to the position P1 during forward movement becomes a resistance Fn2 larger than the resistance Fn1 during backward movement.

[0060] Accordingly, the force required to slide the seat ST only needs to be lighter and smaller when moving rearward than when moving forward. In other words, regarding the sliding structure SK, the resistance to the movement of the seat ST toward the first end side of the upper rail 2 where the resistance providing portion 3 is installed is large and heavy, and the resistance to the movement of the seat ST toward the second end side opposite to the side where the resistance providing portion 3 is installed is small and light.

[0061] The resistance providing portion 3, as Figure 7 shown in the second embodiment of the sliding structure SK, may also be installed at the rear end portion of the upper rail 2. In this case, the resistance when the seat ST moves forward can be made smaller and lighter than the resistance when moving rearward.

[0062] At this time, although the relationship between one lower rail 1 and the upper rail 2 that engages with the lower rail 1 and slides has been described, most vehicles lay a pair of lower rails 1 in parallel on the floor FL, and the seat ST is provided with a pair of upper rails 2 that engage with the pair of lower rails 1. In this embodiment, when different moving resistances are exerted only during forward movement and rearward movement, the resistance providing portion 3 can be installed on both of the pair of upper rails 2, or the resistance providing portion 3 can be installed on only one of the pair of upper rails 2.

[0063] The pair of upper rails 2 of the seat ST are sometimes independently fixed to the seat frame and are directly connected without being integrated. In this case, in order to completely prevent the upper rail 2 from swaying upward with respect to the lower rail 1, it is desirable to install the resistance providing portion 3 on both of the pair of upper rails 2.

[0064] Some seats ST, as Figure 8 shown, have a connecting frame 5 that directly connects the pair of upper rails 2 respectively. A seat cushion frame (not shown) is connected and arranged on the connecting frame 5 to form the seat ST. When the pair of upper rails 2 are connected and integrated by the connecting frame 5, they move in a linked manner in the left - right direction. Therefore, it is difficult to adopt the type in which the upper rail 2 rotates with automatic centering in the left - right direction with respect to the lower rail 1 as described above on both sides of the pair of lower rails 1.

[0065] Here, in the seat ST having the connecting frame 5, a sliding structure SKA is considered in which the rotating arm portion 32 of the resistance providing portion 3 also undertakes the positioning of the upper rail 2 in the left - right direction. For this, refer to Figures 9A to 9C for description. If the Figure 8 sliding structure in the case where the seat ST shown has the connecting frame 5 is made into the sliding structure SKA, Figure 9A is a schematic front view of a sliding structure SKA1 which is a first modification of the sliding structure SKA. Figure 9B is a schematic front view of a sliding structure SKA2 which is a second modification of the sliding structure SKA. Figure 9CIt is a schematic front view of the sliding structure SKA3 which is the third modification example of the sliding structure SKA. In each figure, in order to facilitate understanding, the rotation arm portion 32 is hatched.

[0066] Figure 9A The sliding structure SKA1 is shown in the case where the two of a pair of lower rails 1 are of a type that does not automatically align in the left - right direction. That is, each of the pair of lower rails 1 has a moving slide rail portion 14b that horizontally extends in the left - right direction, and each of the pair of upper rails 2 has a roller 23 that rotates on the upper surface of the moving slide rail portion 14b. The left and right upper rails 2 are formed with an upper rail body 2T that is integrated by being connected by a connecting frame 5. In this structure, the upper rail body 2T can sway in the left - right direction and the up - down direction.

[0067] Here, the left rotation arm portion 321 of the left - hand resistance providing portion 3L is arranged in a vertical posture so as to abut against the lower surface of the top wall portion 12 of the lower rail 1L, and the right rotation arm portion 322 is arranged in a horizontal posture together with the sliding portion 314 ( Figure 9A not shown in the figure) so as to abut against the inner surface of the side wall portion 11R on the right side of the lower rail 1L. On the other hand, the left rotation arm portion 323 of the right - hand resistance providing portion 3R is arranged in a horizontal posture so as to abut against the inner surface of the side wall portion 11L on the left side of the lower rail 1R, and the right rotation arm portion 324 is arranged in a vertical posture together with the sliding portion 314 (not shown) so as to abut against the lower surface of the top wall portion 12 of the lower rail 1R.

[0068] With the above structure, in the sliding structure SKA1, the upward movement of the upper rail body 2T is restricted by the rotation arm portion 321 in the lower rail 1L and by the rotation arm portion 324 in the lower rail 1R. In addition, the leftward movement is restricted by the rotation arm portion 323, and the rightward movement is restricted by the rotation arm portion 322. Thus, in the sliding structure SKA1, the upper rail body 2T moves in the front - rear direction without swaying relative to the pair of lower rails 1L and 1R.

[0069] (Modification example 2)

[0070] Figure 9B The sliding structure SKA2 is shown in the case where one of the pair of lower rails 1 (the left - hand side in this example) is of a non - self - aligning type, and the other (the right - hand side) is of a type having an inclined moving slide rail portion 14c and a roller 22 in surface contact therewith and being self - aligning in the left - right direction. In this structure, the left - right direction sway of the upper rail body 2T is not generated because it is restricted by the right - hand lower rail 1R, but sway in the upward direction is generated.

[0071] Here, the left rotary arm portion 325 of the left resistance providing portion 3L abuts against the lower surface of the top wall portion 12 of the lower rail 1L, and the right rotary arm portion 326 abuts against the lower surface of the top wall portion 12 of the lower rail 1R, and is arranged in a vertical posture together with the sliding portion 314 ( Figure 9B not shown in the figure).

[0072] With the above structure, in the sliding structure SKA2, the upward movement of the upper rail body 2T is restricted by the rotary arm portion 325 in the lower rail 1L and by the rotary arm portion 326 in the lower rail 1R. Thus, in the sliding structure SKA2, the upper rail body 2T moves in the front-rear direction relative to the pair of lower rails 1L and 1R without wobbling.

[0073] (Modification 3)

[0074] Figure 9C It is a type in which the pair of lower rails 1 do not self-align in the left-right direction. In addition, inclined guide portions 14cL and 14cR that incline toward the center as they go upward are formed on the inner surfaces of the connecting portions of the side wall portions 11L and 11R and the top wall portion 12 of the lower rail 1R on one side (the right side in this example). The resistance providing portion 3R is arranged in an inclined posture that inclines to the left as the left rotary arm portion 328 goes upward and abuts against the left inclined guide portion 14cL, and the right rotary arm portion 329 is arranged in an inclined posture in the opposite direction and abuts against the inclined guide portion 14cR. In addition, in the left lower rail 1L, the left rotary arm portion 327 of the resistance providing portion 3L is arranged in a vertical posture so as to abut against the lower surface of the top wall portion 12 of the lower rail 1L.

[0075] In this structure, the wobbling in the left-right direction is restricted by the rotary arm portions 328 and 329, and the wobbling upward is restricted by the rotary arm portion 327 and the rotary arm portions 328 and 329. Thus, in the sliding structure SKA3, the upper rail body 2T moves in the front-rear direction relative to the pair of lower rails 1L and 1R without wobbling.

[0076] The present invention is not limited to the embodiments and sequences described above, and various modifications can be made without departing from the gist of the present invention.

[0077] The structure of mounting the resistance providing portion 3 at the end of the slide rail base portion 21 of the upper rail 2 is not limited to the above-described snap structure. It can be by screwing, or other known mounting structures. In addition, the resistance providing portion 3 can be detachable or non-detachable relative to the slide rail base portion 21.

[0078] The force - applying member that applies force to the rotating arm portion 32 is not limited to a torsion helical spring such as the helical spring 34. If it is a helical spring, it can be a tensile helical spring, a compression helical spring, or other types of springs such as leaf springs. In addition, an elastic member such as rubber other than a spring can also be used as the force - applying member.

[0079] Vehicles include not only cars, trains and other vehicles, but also flying objects such as ships and airplanes, meaning movable objects for carrying people.

[0080] In addition, the up - down, left - right, front - back directions in the above description are directions defined for the convenience of explanation, and do not limit the posture of the seat ST and the sliding direction of the sliding structure SK, etc.

[0081] Reference numeral description

[0082] 1 Lower rail

[0083] 11, 11L, 11R Side wall portions

[0084] 12, 12L, 12R Top wall portions

[0085] 12La, 12Ra Ceiling lower surface

[0086] 12d Gap

[0087] 13 Bottom wall portion

[0088] 14, 14L, 14R, 14b, 14c Moving slide rail portions

[0089] 14cL, 14cR Inclined guiding portions

[0090] 2 Upper rail

[0091] 2T Upper rail body

[0092] 21 Slide rail base

[0093] 211 Base

[0094] 212 Upper protruding portion

[0095] 212a Through - hole

[0096] 213 Recess

[0097] 213a Engaging portion

[0098] 214 Void portion

[0099] 22, 23 Rollers

[0100] 3, 3L, 3R Resistance - providing portions

[0101] 31 Main body portion

[0102] 31a through-hole

[0103] 31b seat part

[0104] 311 base part

[0105] 311a upper part

[0106] 312 guide piece

[0107] 313 engaging piece

[0108] 313a engaging part

[0109] 314, 314L, 314R sliding part

[0110] 315 columnar locking part

[0111] 315a through-hole

[0112] 315b strut part

[0113] 315c locking part

[0114] 32, 32L, 32R, 321 - 329 rotating arm part

[0115] 32a extending part

[0116] 32b sickle-shaped part

[0117] 32b1 inner surface

[0118] 32b2 outer surface

[0119] 32c base part

[0120] 32c1 through-hole

[0121] 32d cutting-in part

[0122] 33 pin

[0123] 33a circumferential groove

[0124] 34 helical spring

[0125] 341, 341L, 341R main trunk part

[0126] 343, 343L, 343R arm part

[0127] 35 E-ring

[0128] 36 clip

[0129] 5 connecting frame

[0130] 91 seat cushion

[0131] 92 seat back

[0132] 93 headrest

[0133] CLV vertical plane

[0134] CL3 axis

[0135] d spacing

[0136] FL floor

[0137] Fn1, Fn2 resistance

[0138] H3, H3B clearance

[0139] P, P1 positions

[0140] SK, SKA, SKA1 - SKA3 sliding structures

[0141] ST vehicle seat (seat)

[0142] T1 torque

[0143] V31, V space

Claims

1. A sliding structure for a vehicle seat, comprising: A lower rail, which is installed on the floor of a vehicle equipped with a vehicle seat; The upper track is installed on the seat cushion of the vehicle seat and engages with the lower track to slide; And A resistance providing portion, which is installed at an end of the upper rail, The resistance providing portion has: A main body portion, which is installed at the end; A rotating arm portion, which rotates relative to the main body portion about an axis extending in the width direction of the lower rail and enters a gap between the main body portion and the top wall portion of the lower rail; And A biasing member, which biases the rotating arm portion in a direction to enter the gap.

2. The sliding structure for a vehicle seat according to claim 1, wherein The rotating arm portion has a sickle-shaped portion, which is formed in a sickle shape as a portion entering the gap.

3. The sliding structure for a vehicle seat according to claim 2, wherein When the upper rail slides relative to the lower rail, the sickle-shaped portion slides while applying a force to the lower surface of the top wall portion by the force generated by the biasing member.

4. The sliding structure for a vehicle seat according to claim 2, wherein The sickle-shaped portion is plate-shaped and has a shape that expands from the tip side toward the root, and the larger the gap is, the more the sickle-shaped portion enters the root into the gap.

5. The sliding structure for a vehicle seat according to any one of claims 1 to 4, wherein The resistance providing portion is installed at the first end of the upper rail, and the resistance when the vehicle seat slides toward the first end side is greater than the resistance when the vehicle seat slides toward the opposite side of the first end.

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