CN110997386B

CN110997386B - Cover device

Info

Publication number: CN110997386B
Application number: CN201880051057.0A
Authority: CN
Inventors: 园田真一
Original assignee: Nifco Inc
Current assignee: Nifco Inc
Priority date: 2017-08-07
Filing date: 2018-07-20
Publication date: 2023-02-03
Anticipated expiration: 2038-07-20
Also published as: CN110997386A; JP6837399B2; JP2019031168A; WO2019031196A1

Abstract

A linkage mechanism (12) comprising: a base (19); first and second links (20, 21) pivotally supported by the base (19); and a third link (22) pivotably supported by the first and second links (20, 21). The first to third links (20, 21, 22) are mainly made of resin or the like so as to be lighter in weight than those made of metal, but this results in a greater thickness to ensure strength. The first to third links (20, 21, 22) are arranged to overlap each other in the moving direction of the link mechanism (12), thereby suppressing an increase in required space in the rotational axis direction. The first link (20) is provided with a first groove (42) so that the third link (22) enters the first groove when the cover (11) is in the open position, whereby the first and third links (20, 22) are prevented from interfering with each other to narrow the movable range of the link mechanism (12), and damage and looseness of the third link (22) that has entered the first groove (42) are suppressed.

Description

Cover device

Technical Field

The present disclosure relates to a cover device including a cover for opening and closing an opening of an article and a link mechanism for laterally moving the cover with respect to the opening.

Background

For example, a cover device configured to open and close a fuel filler port of a motorcycle via a link mechanism is disclosed in patent document 1. Patent document 1 discloses a cover device that includes a cover connected to a vehicle body via a four-bar linkage, and each link is composed of a thin plate.

Documents of the prior art

Patent documents:

patent document 1: JP5873763B2.

Disclosure of Invention

Task to be accomplished by the invention

Since the links of the cover device disclosed in patent document 1 are each composed of a thin plate, it is necessary to use links made of metal or the like to secure the strength of the link mechanism. However, as in the case of a lid device for opening and closing a fuel filler port of a vehicle, it may be desirable to reduce the weight of the lid device. When the material of the link disclosed in patent document 1 is replaced with a material such as resin that is light in weight and lower in strength than metal, the strength of the link mechanism becomes insufficient. When only the thickness and/or width of the resin link is increased to ensure strength, the space occupied by the link mechanism becomes too large. In addition, it was found that the resin connecting rod is easily damaged as compared with the metal connecting rod. It has also been found that resin tie rods tend to cause loosening of the cap.

In view of such a problem, an object of the present invention is to provide a cover device that includes a link mechanism having necessary strength while suppressing an increase in the occupied space of the link mechanism and a decrease in the movable range, so that damage to the link and looseness of the cover can be suppressed, and that is light in weight.

Means for accomplishing tasks

The cover device according to at least some embodiments of the present invention is a cover device (1) including a cover (11) for opening and closing an opening (8) provided in a main body (6), and a link mechanism (12) mounted on the main body and the cover to support the cover so that the cover is movable between a closed position closing the opening and an open position opening the opening, wherein the link mechanism includes: a base (19) fixed to the body; a first link (20) and a second link (21) pivotally supported by the base in spaced relation to each other on respective proximal sides thereof; a third link (22) pivotably supported on one end side thereof by a free end side of the first link and pivotably supported on the other end side thereof in an intermediate position of the second link, wherein the cover includes a link (18) pivotably supported by the free end side of the second link, and one of the first link and the third link is provided with a first groove (42), at least a portion of the other of the first link and the third link entering the first groove (42) when the cover is moved toward the open position.

When a material such as resin, which is lighter in weight and lower in strength than metal, is used as a main material of each link, it is necessary to increase the thickness (length in a direction parallel to the rotation axis) and/or the width (length or height in a direction orthogonal to the longitudinal direction of the link and the rotation axis) to ensure the strength. According to this configuration, even if the thickness and/or the width is increased to ensure the strength, since the first link and the third link are arranged to overlap each other in the moving direction of the link mechanism, an increase in the space occupied by the link mechanism 12 in the rotating shaft direction is suppressed, so that it is possible to reduce the weight of the cover device while ensuring the required strength. Further, the provision of the first groove prevents the first link and the third link from interfering with each other in the open position and reduces the movable range of the link mechanism. In addition, when the material of each link is of lower strength than metal, the risk that the link may be damaged increases, which may result in loosening of the cover, but the link that has entered the first recess is protected by the wall defining the first recess, and therefore damage to the link and loosening of the cover in the open position are suppressed. It should be noted that the reduction in strength due to the provision of the first recess may be compensated for by adjusting the height of the walls defining said first recess.

The cover device according to at least some embodiments of the present invention is characterized in that, in the above configuration, the first groove is provided in the first link.

According to this configuration, the first link to which the force from the cover is more likely to be transmitted than to the third link can be made thicker than the third link, and therefore, it is easy to ensure the strength required for the first link.

The cover device according to at least some embodiments of the invention is characterized in that, in the above-described configuration, the free end side of the first link includes first and second branch portions (36, 37), and a shaft portion (39) for pivotable connection between the first link and the third link extends between the first and second branch portions and pivotably supports the one end side of the third link between the first and second branch portions.

According to this configuration, the first link supports the one end side of the third link from both sides, and therefore, the force transmitted between the first link and the third link is less likely to generate torsion and/or bending that does not follow a plane including the moving direction of the link mechanism, whereby the first and third links become stable, and an increase in strength required for the first and third links can be prevented.

The cover device according to at least some embodiments of the invention is characterized in that, in the above-mentioned configuration, the connecting member is provided with a slide groove (40) in which the shaft portion is slidable, the free end side of the first link includes a third branch portion (38) on the opposite side of the connecting member from the first and second branch portions, the shaft portion extends through the slide groove to at least the third branch portion, and the first link is provided with a second groove (43) into which at least a part of the connecting member enters when the cover is moved toward the open position.

According to this configuration, the force transmitted from the cover to the first link is dispersedly transmitted to the second and third branch portions via the connecting member, and therefore, torsion and/or bending that does not follow a plane containing the moving direction of the link mechanism is less likely to occur, and the required strength of the first link can be prevented from increasing. In addition, the second groove prevents the link and the first link from interfering with each other in the open position and reduces the movable range of the link mechanism, and suppresses damage and looseness of the link. Further, since the link is pivotably supported by the second link and is slidably supported with respect to the shaft for pivotable connection between the first link and the third link, the moving distance of the cover becomes larger than that of the third link, so that it is possible to widely displace the cover from the opening in the open position.

The cover device according to at least some embodiments of the invention is characterized in that, in the configuration in which the first link is provided with the first recess, the second link is provided with a third recess (47), the third recess (47) accommodating at least a part of the other end side of the third link, and when the cover is moved toward the closed position, a part of the third link enters the third recess (47).

According to this configuration, the second link supports the third link from both sides, and therefore, the force transmitted between the second link and the third link is less likely to generate torsion and/or bending that does not lie along a plane containing the direction of movement of the link mechanism, whereby the second and third links become stable, and an increase in the strength required for the second and third links can be prevented. Further, since the second link and the third link are arranged to overlap each other in the moving direction of the link mechanism, it is possible to suppress an increase in the space occupied by the link mechanism 12 in the rotation axis direction, and the third groove prevents the second link and the third link from interfering with each other in the closed position and reduces the movable range of the link mechanism 12. In addition, the third link that has entered the third groove is protected by the wall defining the third groove, and therefore, damage and slack in the closed position can be suppressed. It should be noted that the reduction in strength due to the provision of the third groove can be compensated for by adjusting the height of the walls defining said third groove.

The cover device according to at least some embodiments of the present invention is characterized in that, in any of the above-described configurations, the cover device further comprises a torsion coil spring (32), the torsion coil spring (32) winding a base shaft portion (24) pivotally connected with the base and the first link such that the torsion coil spring biases the first link in a direction to move the cover toward an open position, wherein the first link comprises a proximal portion (28) extending along the base shaft portion, and the base comprises an engaging portion (35) configured to engage the proximal portion in the open position.

According to this configuration, the force for moving the lid to the open position can be provided by the torsion coil spring, and the load on the first link main body (23) is smaller than that in a structure in which the open position is determined by the engagement of the shaft portion with the end portion of the chute, whereby the required strength of the first link can be reduced, and the looseness of the lid can be suppressed.

The cover device according to at least some embodiments of the present invention is characterized in that, in any one of the above-described configurations, the second link is provided with a locking hole (49) configured to be selectively engaged by a locking member (50) in a closed position to lock the cover in the closed position, and the base is provided with a guide portion (51), the guide portion (51) slidably supporting the locking member to guide engagement and disengagement of the locking member with the locking hole.

According to this configuration, since the lock hole is integrated with the second link, and the guide portion is integrated with the base, an increase in the number of components can be suppressed.

The cover device according to at least some embodiments of the present invention is characterized in that, in any of the above-described configurations, the main body is a vehicle body (6) provided with a fuel filler opening (7) or a power supply opening on an inner side of the opening, and the base is fixed to a portion of the vehicle body on an inner side than the opening.

According to this configuration, the link mechanism is not visible from the outside in the closed position, and therefore, the appearance of the vehicle is not impaired.

Effects of the invention

According to the present invention, it is possible to provide a cover device that includes a link mechanism having sufficient strength while suppressing an increase in the occupied space of the link mechanism and a decrease in the movable range, so that damage to the link and looseness of the cover can be suppressed, and that is light in weight.

Drawings

Fig. 1 is a side view of a motorcycle having a cover device according to an embodiment.

FIG. 2 is a rear view of the lid apparatus (closed position) according to an embodiment;

FIG. 3 is a rear view of the lid apparatus (open position) according to an embodiment;

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line V-V in FIG. 3;

fig. 6 is a perspective view of a linkage mechanism (closed position) according to an embodiment;

FIG. 7 is a perspective view of a linkage mechanism (open position) according to an embodiment;

fig. 8 is a perspective view of a first link according to an embodiment.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Hereinafter, a cover device 1 according to an embodiment of the present invention is described with reference to the drawings. Fig. 1 shows a motorcycle 2 with a cover device 1. In the following description, the front-rear direction, the lateral direction, and the vertical direction are defined with respect to the motorcycle 2.

The motorcycle 2 is provided with a fuel tank 4 below a pedal 3 on which a rider's foot is to rest. A filler opening (or power supply opening) 7 communicating with the fuel tank 4 is provided in the interior of a portion of the vehicle body 6 below the handle 5. A portion of the vehicle body 6 behind the fuel filler 7 is provided with an opening 8, and the opening 8 is opened and closed by the lid device 1.

As shown in fig. 1 to 3, the cover device 1 includes a cover 11 for opening and closing the opening 8 and a link mechanism 12, the link mechanism 12 being mounted on the body of the motorcycle 2 and the cover 11 to support the cover 11 so as to be movable between a closed position closing the opening 8 and an open position opening the opening 8. The link mechanism 12 is mounted on a portion of the vehicle body 6 on the inner side of the opening 8. When the lid 11 is in the closed position, the link mechanism 12 is stored inside the opening 8, and the surface of the lid 11 is substantially flush with the surface of the vehicle body 6, so that the link mechanism 12 is not visible from the outside. The open position of the cover 11 is a position of the cover 11 lifted rearward from the opening 8 and moved leftward.

As shown in fig. 2 and 3, the cover 11 includes a cover main body 13 for opening and closing the opening 8 (see fig. 1) and a cover mounting portion 14 fixed to a rear surface of the cover main body 13 and connected to the link mechanism 12. The cover main body 13 is fixed to the cover mounting portion 14 by fitting the protruding portions 15 protruding from the back surface of the cover main body 13 into the respective fitting holes 16 provided in the cover mounting portion 14 and screwing screws (not shown in the drawings) into the screw holes 17 of the respective protruding portions 15. The upper end of the cover mounting portion 14 is provided with a link 18, and the link 18 extends forward so as to coincide with the longitudinal direction thereof in the lateral direction of the cover main body 13 and is connected to the link mechanism 12.

As shown in fig. 2 to 7, the link mechanism 12 includes: a base 19 fixed to a portion of the vehicle body 6 further to the inside than the opening 8 (refer to fig. 1), a first link 20 having a proximal end side pivotably supported on a left end side of the base 19, a second link 21 having a proximal end side pivotably supported on a right end side of the base 19, and a third link 22 having a left end side pivotably supported by a free end side of the first link 20 and a right end side pivotably supported in a middle position of the second link 21, preferably, a right end side of the third link 22 is pivotably supported in a position between a center and the free end of the second link 21 with respect to an extending direction of the second link 21. An advantageous material for the base 19 and the first to

third links

20, 21, 22 is resin, but other materials may be used, or they may be made of a composite material containing resin and other materials.

The base 19 includes: a base main body 23 extending in the lateral direction and serving as a fixed link in the link mechanism 12, and a shaft holding portion 25 extending downward from a left end of the base main body 23 and holding a first base shaft portion 24 pivotably supporting the first link 20. For fixation to the vehicle body 6, the base 19 is provided with a plurality of projecting pieces 27, each projecting piece 27 having a fitting hole 26 passing through in the front-rear direction. They are fixed together by means of screws (not shown in the drawings) by means of protrusions (not shown in the drawings) provided on the vehicle body 6 that are fitted into the respective fitting holes 26.

As shown in fig. 8, the first link 20 includes: a proximal end portion 28 extending along the first base shaft portion 24, and a first link main body 29 extending from the proximal end portion 28 in a direction orthogonal to the first base shaft portion 24. The proximal end portion 28 of the first link 20 includes a pair of

walls

30, 30 vertically opposed to each other to form a channel shape, and is arranged to be vertically sandwiched by the shaft holding portion 25 of the base 19. The first base shaft portion 24 held by the shaft holding portion 25 is inserted into the through hole 31 provided in the pair of walls 30, so that the first link 20 is pivotably supported by the base 19. As shown in fig. 2, a torsion coil spring 32 for biasing the first link 20 in the opening direction (the direction in which the cover 11 is moved to the open position) is wound around the first base shaft portion 24. In addition, the first base shaft portion 24 is provided with a damper 33 so that a damping force is applied to the movement of the first link 20 in the opening direction. As shown in fig. 8, a portion of the proximal end portion 28 between the pair of walls 30 is provided with an engaged portion 34 that protrudes in the opening direction at a position spaced from the first base shaft portion 24. As shown in fig. 6, the shaft holding portion 25 of the base 19 is provided with an engaging portion 35 engageable with the engaged portion 34, and the opening position is determined by the engagement of the engaging portion 35 with the engaged portion 34.

As shown in fig. 6 to 8, the free end side of the first link 20 is branched into three parts, so that a first branch portion 36, a second branch portion 37, and a third branch portion 38 are formed at an upper position, an intermediate position, and a lower position, respectively. The first to

third branch portions

36, 37, 38 are provided with coaxial through

holes

36a, 37a, 38a, respectively, into which the first shaft portion 39 for pivotably supporting the third link 22 is inserted. The left end side of the third link 22, which is pivotably supported by the first shaft portion 39, is sandwiched between the first and

second branch portions

36, 37. Further, the connecting member 18 of the cover 11 is sandwiched between the second and

third branch portions

37, 38, and the first shaft portion 39 passes through a slide groove 40 provided in the connecting member 18. The slide groove 40 is an elongated hole elongated in the lateral direction along the cover main body 13, and extends through the link 18 in the vertical direction. The first shaft portion 39 may be able to slide in the slide slot 40 and support the connecting member 18.

The first link body 29 has a bent portion 41, and the bent portion 41 is bent at an obtuse angle such that a free end side thereof extends toward the opening direction with respect to a proximal end side thereof. A surface of the first link main body 29 facing the closing direction (the direction in which the cover 11 is moved to the closed position) is provided with a first groove 42 extending from the gap between the first and

second branch portions

36, 37 toward the curved portion 41 and a second groove 43 extending from the gap between the second and

third branch portions

37, 38 toward the curved portion 41. When the cover 11 is moved toward the open position, the portion of the third link 22 having the plate shape enters the first groove 42, and a portion of the connecting member 18 enters the second groove 43.

As shown in fig. 2 to 7, the proximal end side of the second link 21 is pivotably supported by the base main body 23 via the second base shaft portion 44 at a right side position of the proximal end side of the first link 20. The second link 21 pivotally supports the right end side of the third link 22 via the second shaft portion 45 at an intermediate position between the proximal end side thereof and the free end side thereof, and pivotally supports the right end side of the link 18 via the cover shaft portion 46 on the free end side thereof. The second link 21 is provided with a third groove 47, the third groove 47 accommodates the right end side of the third link 22, and a part of the third link 22 enters the third groove 47 when the cover 11 moves toward the closed position. The free end side of the second link 21 is located below the right end side of the link 18.

The cover device 1 selectively locks the cover 11 in the closed position. As shown in fig. 2 and 3, the free end side of the second link 21 is provided with a locking piece 48 that extends upward and then bends to extend in the closing direction. The locking piece 48 is provided with a locking hole 49 extending therethrough in the vertical direction. The right end side of the base 19 is provided with a guide portion 51, and the guide portion 51 vertically slidably supports a lock member 50 configured to selectively engage the lock hole 49. The lock member 50 is biased downward, and the lower end side of the lock member 50 is formed with an inclined surface 52 extending in the forward and downward directions. As a result, when the cover 11 is moved toward the closed position, the tip of the lock piece 48 slides along the inclined surface 52 to move the lock member 50 upward, and then, the lock member 50 moves downward to engage with the lock hole 49. The tip of the lock member 48 is engaged by the guide portion 51, which restricts the movement of the link mechanism 12 in the closing direction. Further, the engagement of the locking member with the locking hole 49 restricts the movement of the link mechanism 12 in the opening direction, thereby locking the cover 11 in the closed position.

The operation and effect of the cover device 1 will now be described.

When the locking member 50 is engaged with the locking hole 49, the cover 11 is held in the closed position. When the user operates to move the locking member 50 upward to remove the locking member 50 from the locking hole 49, the locking is released and the biasing force of the torsion coil spring 32 acts to move the first link 20 in the opening direction. At this time, the cover 11 connected to the link mechanism 12 is lifted rearward and moved leftward. The engaging portion 35 of the base 19 engages the engaged portion 34 of the first link 20 against the biasing force of the torsion coil spring 32, thereby stably holding the cover 11 in the open position. In the open position, which is determined by the engagement of the engaged portion 34 provided on the proximal end portion 28 of the first link 20 with the engaging portion 35 provided on the shaft holding portion 25 of the base 19, rather than by the engagement of one end of the slide groove 40 with the first shaft portion 39, the load on the first link main body 29 and the link 18 is reduced.

Since the first link main body 29 is bent such that the free end side thereof extends toward the opening direction, the first link 20 extends leftward from the opening 8 in the open position. Further, the cover 11 is not fixed to the third link 22, but the free end side of the second link 21 pivotably supports the right end side of the link 18 of the cover 11, and the first shaft portion 39 slidably passes through a slide groove 40 provided in the left side portion of the link 18. Thereby, the leftward movement distance of the cover 11 becomes greater than the movement distance of the third link 22, which allows the opening 8 to be widely opened.

When the lid 11 is returned to the closed position, the user manually moves the lid to the closed position. At this time, the tip of the locking piece 48 slides on the inclined surface 52 of the locking member 50, which causes the locking member 50 biased downward to move upward. When the locking hole 49 is moved to a position aligned with the tip of the inclined surface 52, the lock member 50 biased downward engages with the locking hole 49, and the cover 11 is locked in the closed position. Since the locking hole 49 is integrated in the second link 21 and the guide 51 is integrated in the base 19, an increase in the number of components is suppressed.

The first link 20 supports the connecting member 18 of the cover 11 via a first shaft portion 39 extending between the second and

third branch portions

37, 38. Therefore, the force from the cover 11 to the first link 20 is dispersedly transmitted to the second and

third branch portions

37, 38, so that a torsion force and/or a force in a direction of bending the first link 20 upward or downward is less likely to be generated in the first link 20. Further, since the first link 20 and the second link 21 both support the third link 22 from both sides, a torsion force and/or a force in a direction of bending the first to

third links

20, 21, 22 upward or downward is less likely to be generated in the first to

third links

20, 21, 22. Therefore, the strength required for the first to

third links

20, 21, 22 is reduced.

When the cover 11 is moved toward the open position, the third link 22 and the connecting member 18 enter the first groove 42 and the second groove 43 provided in the first link 20, respectively. Therefore, although the third link 22 is arranged to overlap with the first link 20 and the second link 21 as viewed from the moving direction of the link mechanism 12 for opening and closing the cover 11, the third link 22 does not interfere with the first link 20 and the second link 21, and therefore, the link mechanism 12 has a large movable range and the moving distance of the cover 11 can be made large. In addition, even if an external force is applied to the cover 11 in the open position, since the first groove 42 and the second groove 43 protect the third link 22 and the connecting member 18, these components are less likely to be damaged, and looseness can be suppressed. Further, since the heights of the walls defining the first groove 42 and the second groove 43 can be adjusted, it is possible to ensure the strength even if the first groove 42 and the second groove 43 are provided. Similarly, when the cover 11 is moved toward the closed position, the third link 22 enters the third groove 47 provided in the second link, and therefore, the moving distance of the cover can be made large, the third link is less likely to be damaged, and looseness can be suppressed in the closed position, and the strength of the second link can be ensured.

The foregoing has described a specific embodiment, but those skilled in the art will readily appreciate that the present invention is not limited to this embodiment, and may be modified or changed in various ways. Instead of the first and third recesses, a plurality of recesses may be provided in the third link such that the portions of the first and second links enter the recesses when moved to the open and closed positions, respectively. The lid device may be a lid device for opening and closing an opening other than the fuel filler opening or the power supply opening, and may be provided in a vehicle other than a motorcycle or an article other than a vehicle. The mounting direction of the cover device can be changed. For example, the cover device may be installed such that the cover opens and closes the opening facing upward, or may be configured such that the vertical direction or the lateral direction is opposite. The entire contents of the basic application, the application of which this application claims priority under the paris convention, and the prior art referenced in this application are incorporated herein by reference in their entirety.

Term(s) for

1: cover device

8: opening(s)

11: cover

12: link mechanism

18: connecting piece

19: base seat

20: first connecting rod

21: second connecting rod

22: third connecting rod

24: first base shaft part (base shaft part)

25: shaft holding part

28: proximal end part

32: torsion coil spring

34: engaged part

35: joint part

36: a first branch part

37: second branch part

38: a third branch part

39: first shaft part (shaft part)

40: sliding chute

42: a first groove

43: second groove

47: third groove

49: locking hole

50: locking member

51: guide part

Claims

1. A cover device, comprising: a cover for opening and closing an opening provided in the main body; and a link mechanism mounted on the main body and the cover to support the cover such that the cover is movable between a closed position closing the opening and an open position opening the opening,

wherein the link mechanism includes:

a base secured to the body;

a first link and a second link pivotally supported by the base in spaced relation to one another on respective proximal sides thereof;

a third link pivotably supported on one end side thereof by a free end side of the first link and pivotably supported on the other end side thereof in an intermediate position of the second link,

wherein the cover includes a link pivotably supported by a free end side of the second link,

one of the first link and the third link is provided with a first groove into which at least a portion of the other of the first link and the third link enters when the cover moves toward the open position,

the first groove is disposed in the first link,

the free end side of the first link includes first and second branch portions,

a shaft portion for pivotable connection between the first link and the third link extends between the first and the second branch portions and pivotably supports the one end side of the third link between the first and the second branch portions,

the connecting piece is provided with a sliding groove in which the shaft part can slide,

the free end side of the first link includes a third branch portion located on a side of the link opposite the first and second branch portions,

the shaft portion extends through the chute to at least the third branch portion, an

The first link is provided with a second recess into which at least a portion of the link enters when the cover is moved toward the open position.

2. The cover device according to claim 1, wherein the second link is provided with a third groove that accommodates at least a part of the other end side of the third link, and a part of the third link enters the third groove when the cover is moved toward the closed position.

3. The cover device of claim 1, further comprising a torsion coil spring wound around a base shaft portion pivotally connecting the base and the first link such that the torsion coil spring biases the first link in a direction to move the cover toward the open position,

wherein the first link includes a proximal portion extending along the base shaft portion, an

The base includes an engagement portion configured to engage the proximal end portion in the open position.

4. The lid device of claim 1, wherein the second link is provided with a locking hole configured to be selectively engaged by a locking member in the closed position to lock the lid in the closed position, and

the base is provided with a guide portion slidably supporting the locking member to guide engagement and disengagement of the locking member with the locking hole.

5. The cover device according to claim 1, wherein the main body is a vehicle body provided with a fuel filler opening or a power supply opening on an inner side of the opening, and

the base is fixed to a portion of the vehicle body that is further inside than the opening.