Patent Publication Number: US-2021164272-A1

Title: Lid urging structure

Description:
TECHNICAL FIELD 
     The present invention relates to a lid urging structure. 
     BACKGROUND ART 
       FIG. 14  illustrates a vehicle lid device disclosed by the present applicant in a prior application (Patent Document 1). A lid device  7  in this figure includes a housing  1  that defines a refueling port space; a lid  2  that is rotatably supported with respect to the housing  1  by a linking member, and can be switched from a closed position where an opening of the housing is closed, to a second position that is partly open from the closed position, to a full-open position; and a urging member  6  that biases the lid  2  in a closing direction at the closed position, and enables switching from the second position to the full-open position through an urging force by reversing an urging direction at the second position when the lid  2  is rotated from the closing direction to the second position. Furthermore, a lid urging structure includes, in particular, the linking member formed of a first link  4 A and a second link  4 B; regulates the lid to a compact rotational trajectory; causes the urging force of the urging member  6  to operate between the two links  4 A and  4 B; uses the urging force to keep the lid from rattling in the closed position and the full-open position; and makes it so that, when unlocked in the closed position, the lid is lifted slightly against the urging force by a push lifter  16  so that the lid can be rotated by hand, or the like. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-47827 
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     In the lid urging structure described above, when a lid is rotated against an urging force from a full-open position to a second position by a lid closing operation, an urging direction of a spring body, which is an urging member, reverses and the lid forcefully collides with a push lifter due to being suddenly rotated from the second position to a closed position, and thus the lid is prone to fluttering and making abnormal sounds. This point is a serious problem because a prescribed torque is secured as a spring body torque so that the lid does not inadvertently flutter in the closed position. 
     Furthermore, as a different configuration, in a lid urging structure B in  FIG. 13 , a lid is switched from a closed position, to a first position that is partly open from the closed position, and to a second position and a full-open position further in an opening direction. The first position is the position at which the lid stops momentarily when rotated from the second position in a closing direction by an urging force, or the position at which an operating force is momentarily unnecessary when the lid is rotated in the opening direction from the closed position against the urging force. In the structure B, at the first position, a lid opening angle is small at only about 10 degrees. Therefore, in an operation that closes the lid, after the lid is rotated from the second position to the first position by the urging force and stops momentarily at the first position, the lid is once again rotated to the closed position by the urging force. As a result, since the lid opening angle at the first position is small at only about 10 degrees, the lid is prone to hitting a push lifter at high speed, thus making abnormal sounds and impairing a sense of quality. 
     A frictional resistance of an elastic member or a soft material, which are friction materials, has been used to attenuate a rotational speed of a lid as a countermeasure against this. However, the friction materials are not stable because the mechanical properties of the friction materials change with surface wear that generates frictional force, and with ambient temperature. 
     Objects of the present invention include resolving problems like those described above, enhancing a feeling of a lid opening and closing operation when compared to the past, and preventing fluttering and abnormal sounds when closing a lid without depending on frictional force. Other objectives will be made clear in the following descriptions. 
     Means for Solving the Problem 
     To achieve the object described above, the present invention is a lid urging structure that includes a housing that arranges a refueling port or an electric recharging port in an opening inner part; a lid that is rotatably supported with respect to the housing by a linking member, and can be switched from a closed position where an opening of the housing is closed, to a first position that is partly open from the closed position, to a second position further in an opening direction, and to a full-open position; and an urging member that biases the lid in a closing direction at the closed position, and that is able to switch through an urging force from the second position toward the full-open position by reversing an urging direction when a rotation operation is performed against the urging force from the closing direction (the closing direction is either the closed position, a first position vicinity between the closed position and the first position, or the first position, the same applying hereinafter) toward the second position; where the urging member is formed of a plurality of spring bodies arranged between the linking member and the housing, and wherein an equilibrium of each spring body adjusts an operating force that rotates the lid from the closed position to the first position or the first position vicinity against the urging force and an urging force that rotates and biases the lid from the first position or the first position vicinity to the closed position. 
     Thus, in the lid urging structure according the present invention, the lid can be switched by rotation from the closed position where the housing opening is closed, to the first position that is partly open from the closed position, and to the second position further in the opening direction and to the full-opening position. This point will be described with reference to  FIG. 13 . In  FIG. 13 , structures A through C 1  are notations for abbreviating lid urging structures A through C 1 .  FIG. 13  illustrates test examples of adjustments of a lid opening angle (degree) and a lid tip operating force (N) with respect to a structure A using spring bodies  6  and  7  as products according to the present invention, a structure B using a single spring body  6 , and a structure C or C 1  using a single spring body  7  or  7 A as a comparison products. The lid urging structure A is a product according to the present invention that is the same as the morphological form. The lid urging structures B, C, and C 1  are comparison products that differ from the morphological form only due to being configured of only one spring body. 
     Of these, the lids in structures C and C 1  can be switched from a closed position, to a second position that is partly open from the closed position, and to a full-open position same as in Patent Document 1. In these structures, when a lid is rotated against an urging force from a full-open position to a second position by a lid closing operation, an urging direction of a spring body, which is an urging member, reverses and the lid forcefully collides with the push lifter  16  of Patent Document 1 due to being suddenly rotated from the second position to the closed position. This point is a serious problem in cases where a prescribed torque is secured as spring body torque so that the lid does not inadvertently flutter in the closed position (problem 1 of the present invention). 
     By contrast, in the structures A and B, the lids are switched from a closed position, to a first position that is partly open from a closed position, to a second position further in an opening direction, and to a full-open position. Thus, the second position is the same as in the structures C and C 1  and inside a lid opening angle when a spring body urging direction reverses, and is thus a lid position when a spring body urging direction reverses upon operation of the lid against an urging force toward a closing direction from the full-open position, and the lid is then rotated in the closing direction by the urging force. In this example, the lid opening angle is about 50 degrees. Furthermore, the first position is the position at which the lid stops momentarily when rotated from the second position in a close direction by the urging force, or the position at which an operating force is unnecessary when the lid is rotated in the opening direction from the closing position against the urging force. The lid angle is about 25 degrees at the first position in the structure A and about 10 degrees at the first position in the structure B. 
     Incidentally, for either of the structures A or B, in an operation that closes the lid, after the lid is rotated in the closing direction from the second position by the urging force, and after stopping momentarily at the first position, the lid is once again rotated to the closed position by the urging force. In such cases, if the lid opening angle at the first position is small at only about 10 degrees, as with structure B, there is a problem in that the lid is prone to hitting a push lifter at high speed, rendering the lid difficult to use and impairing a sense of quality (problem 2 of the present invention). By contrast, since the lid opening angle at the first position has been significantly modified to about 25 degrees in the structure A, which is a product according to the present invention, the structure can eliminate and alleviate such problems by reducing tapping sounds and fluttering, and is thus effective in providing a sense of quality and preventing finger pinching. 
     Note that the reason “the lid from the closed position to the first position or the first position vicinity” and “the lid from the first position or the first position vicinity” are specified, that is, the reason “the first position vicinity” in addition to “the first position” is added in the present invention is as described below. For example, in the lid closing operation in  FIG. 13 , when the lid is rotated from the second position to the first position (where the lid opening angle is 25 degrees) by the spring body urging force, the lid momentarily stops at the first position and is once again biased in the closing direction at a lid opening angle of about 20 degrees. In other words, the reason is to account for a time lag associated with such a urging direction reversal. 
     The present invention as described above may be embodied according to the following aspects. 
     (A) A configuration where the linking member is made up of a first link and a second link, one end side of which is pivotally supported against a back side of the lid while the other end side is pivotally supported against an inside of the housing; and the spring body includes a first spring body arranged between the first link and the housing and a second spring body arranged between the second link and the housing side. Since, according to this aspect, the linking member is formed of two links, the lid can easily be regulated to a compact rotational trajectory, in the same way as in Patent Document 1. Additionally, since the present invention includes the first spring body arranged between the first link and the housing and the second spring body arranged between the second link and the housing as a lid urging structure, rattling can be prevented in each of the links, the lid opening angle at the first position can easily be made bigger as can be deduced from  FIG. 13 , and a lid opening and closing operation feeling can be set in various ways according to purposes. 
     (B) A configuration where the use of the first spring body and the second spring body allows the lid opening angle to be set larger at the first position when compared with cases using the first and second spring bodies independently. Since, as can be seen from  FIG. 13 , the lid opening angle at the first position can be set larger when the first and second spring bodies are used according to this aspect than in a configuration where the first and second spring bodies are used independently, it becomes easier in, for example, a lid closing operation to alleviate an impact during opening proportional to the distance or rotation angle from the first position to the closed position, thus making it possible to enhance a sense of quality by reducing conventional tapping sounds and fluttering. 
     (C) A configuration that includes a base provided inside the housing that pivotally supports the first link and the second link and regulates a corresponding end part side of the spring body. According to this aspect, pivotally supporting the links and arranging the spring base between the lid and the base makes it possible to maintain good lid handling properties, ease of incorporation into the housing, and good appearance characteristics. 
     (D) A configuration where the first link includes an upper plate part pivotally supported by the lid, a middle plate part linked to the upper plate part and pivotally supported by the base, and an arm part in which a fitting hole is formed penetrating in a width direction linked to the middle plate part, and where the first spring body is arranged between the arm part and an inner wall of the base provided so as to face the arm part, with one end of the spring body being regulated to fit into the fitting hole and the other end being regulated to fit into a fitting hole provided in the inner wall. 
     (E) A configuration where the second link includes a plate body pivotally supported by both the lid and the base, a pair of projecting leg parts for keeping an interval in a lower side of the plate body at intervals, and a groove part provided on a back surface side of the leg parts, and where the second spring body is arranged on an inner surface side of the base, with one end of the spring body being regulated to fit into the groove part for one of the leg parts and the other end being regulated to fit into a fitting hole provided on the base penetrating in a vertical direction. Since, according to these aspects (D) and (E), the links are simplified, and one end of each of the spring bodies is positioned and regulated to a corresponding link while the other end is positioned and regulated to a part corresponding to the base, assembly is made easy and rattling between members is reliably absorbed. 
     (F) The spring bodies described above are coil springs. These coil springs include torsion springs that include coil parts. Using simple and versatile coil springs as the spring bodies, according to this aspect, allows implementation at a low cost. 
     Effect of the Invention 
     In the present invention, an equilibrium of spring bodies makes it possible to more optimally set a size of an operating force for rotating a lid from a closed position to a first position or a first position vicinity and a size of an urging force urging so as to rotate the lid from the first position or the first position vicinity to the closed position than in a configuration using one spring body. As a result, a sense of a lid opening and closing operation can be enhanced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1( a ) and 1( b )  illustrate the application of the lid urging structure of one aspect according to the present invention where  FIG. 1( a )  is a schematic drawing illustrating a lid closed position, and  FIG. 1( b )  is a schematic drawing illustrating a lid full-open position. 
         FIG. 2  is a view of a lid back surface viewed from a lid back side at the lid closed position. 
         FIGS. 3( a ) and 3( b )  illustrate a front surface view and right end surface view where  FIG. 3( a )  and  FIG. 3( b )  illustrate the lid in  FIG. 2  upside down. 
         FIG. 4  is a schematic operation diagram for describing a movement of the lid. 
         FIGS. 5( a ) and 5( b )  are a magnified views schematically illustrating main components of a lid urging structure where  FIG. 5( a )  and  FIG. 5( b )  illustrate the closed position and the first position in  FIG. 4 . 
         FIGS. 6( a ) and 6( b )  are magnified views schematically illustrating main components of a lid urging structure where  FIG. 6( a )  and  FIG. 6( b )  illustrate the second position and the full-open position in  FIG. 4 . 
         FIG. 7  is a schematic exploded view illustrating a relationship between the lid and a housing. 
         FIG. 8  is a schematic exploded view illustrating a support structure for the lid and a member configuration thereof. 
         FIG. 9( a )  illustrates a front surface view illustrating a relationship between a base, a first link, and a first spring body,  FIG. 9( b )  illustrates a front surface view illustrating the relationship in an assembled state, and  FIG. 9( c )  illustrates a side surface view of the assembled state. 
         FIG. 10( a )  illustrates a front surface view illustrating a relationship between a base, a second link, and a second spring body,  FIG. 10( b )  illustrates a front surface view illustrating the relationship in an assembled state, and  FIG. 10( c )  illustrates a side surface view of the assembled state. 
         FIG. 11  is a structural view illustrating an embodiment product used in a lid opening and closing operation sensing test. 
         FIGS. 12( a ) and 12( b )  illustrate comparisons product used in lid opening and closing operation sensing tests, where  FIG. 12( a )  is a structural view of a comparison product 1 that uses only the first spring body, and  FIG. 12( b )  is a structural view of a comparison product 2 that uses only the second spring body. 
         FIG. 13  is a graph showing relationships between lid end operating forces (N) and lid opening degrees of the embodiment product and the comparison products 1 and 2. 
         FIG. 14  is a cross sectional view illustrating the lid urging structure disclosed in Patent Document 1. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments according to the present invention will be described with reference to the attached drawings. In this description, operational characteristics will be discussed after a detailed description of the lid urging structure according to the present invention with reference to  FIG. 1( a )  through  FIG. 11 . Note that the drawings, especially  FIGS. 5 ( a ) and 5( b )  and  FIGS. 6( a ) and 6( b ) , are schematized due to drawing restrictions. 
     (Lid Urging Structure) In  FIG. 1( a )  through  FIG. 11 , the lid urging structure includes an approximately container-shaped housing  1  with an upper opening that defines a refueling port part; a lid  2  that is connectably supported with respect to the housing  1  by a first link  4  and a second link  5  as a linking member, and can be switched from a closed position where an opening of the housing  1  is closed, to a first position that is partly open from the closed position, to a second position and a full-open position further in an opening direction; and a plurality of spring members  6  and  7  that are urging members that bias the lid  2  in a closing direction at the closed position, and enable switching from the second position to the full-open position through urging forces by reversing urging directions when a rotation operation is performed against the urging force from the closing direction to the second position. 
     In other words, the lid  2  is rotatably supported with respect to a base  3  provided inside the housing  1  through the first link  4  and the second link  5 . The first spring body  6  is arranged between the first link  4  and the base  3 , and the second spring body  7  is arranged between the second link  5  and base  3 . Furthermore, the lid  2  is locked in the closed position in  FIG. 1( a )  by locking means  18  mounted on an outer circumference of the housing  1 . For example, when the locking means  18  is unlocked through a car door opener unlocking operation or a door lock release operation, the lid  2  is opened a little from the closed position against an urging force of the first spring body, or the like, by a push lifter  17  (as illustrated in  FIG. 13 , a lid opening angle is about 6 degrees). Thus, when the lid  2  is rotated by hand, or the like, to the second position in the opening direction, the urging direction of the second spring body  7 , or the like, is largely reversed at the second position, and the lid is subsequently rotated in the opening direction by the urging force. These details are clarified below. 
     Note that the housing  1 , the lid  2  (lid body  20  and supporting body  25 ), the base  3 , the first link  4 , and the second link  5  are all resin injection molded products. However, the materials thereof may be other than resin. 
     First, the housing  1  includes a flange part  11  that protrudes into an upper inner circumference of a cylindrical part  10 . Furthermore, the cylindrical part  10  includes a through hole  13  provided in a bottom wall, a concave part  14  that is provided on an inner circumference and is large enough to accept the base  3 , a cavity part  15  formed one level lower on upper left and right sides of the concave part  14 , a cavity part  16  formed one level lower in a location on an inner circumference and facing the concave part  14 , and a push lifter  17  assembled to an outer circumference for slightly lifting, from the closed position, the lid  2  and the locking means  18  locking the lid  2  in the closed position. 
     Within the housing, a plurality of protrusions  12   a  and curved ribs  12   b,  or the like, protrude in the flange part  11  in order to accept the lid  2  as illustrated in  FIG. 8 . For example, a linking tube extending toward a fuel tank side not illustrated in the figure is connected to the through hole  13 . Furthermore, a refueling operation is performed with a refueling nozzle inserted into the through hole  13  and the linking tube through a refueling port that is an upper opening in the cylindrical part  10 . 
     The concave part  14  includes engaging ridges  14   a,  the upper sides of which connect to the cavity part  15  extending up and down, respectively, facing each other; holding protrusions  14   b  protruding toward a back side for positioning the base  3 ; and a mounting hole  14   c  that penetrates to the outside provided between an inner surface and the holding protrusion  14   b.    
     As can be deduced from  FIG. 1 ( b ) , the cavity part  15  is the location where a base end side of the lid  2  is released when the lid  2  is rotated to the full-open position. A through hole  16   a  that allows a push  17   a  of the push lifter  17  to protrude inwardly from the outside is provided in the cavity part  16 . The push lifter  17  is disclosed in Japanese Unexamined Patent Application Publication No. 2015-105062, and the like, and enables a lid front end side to be grabbed by a finger, or the like, by causing the push  17   a  to protrude and slightly push up and float the lid  2  when the lid  2  is opened. A through hole not illustrated in the figure that allows a locking member  18   a  of the locking means  18  to protrude inwardly from the outside is provided near the cavity part  16 . Furthermore, the locking means  18  is mounted on an outer circumference of the housing and locks the lid  2  closed when the locking member  18   a  protrudes from the through hole and switches to open the lid  2  when the member exits the through hole. As illustrated in  FIG. 3( a ) , the housing  1  described above holds the lid  2  in an assembled state against an attaching frame  9  mounted inside an opening in an outer panel  8  of a vehicle body. 
     The lid  2  is made up of a lid body  20  and a supporting body  25 . As illustrated in  FIG. 3( a ) , the lid body  20  is disc-shaped and fits in the opening of the outer panel  8 . A plurality of positioning protrusions  21  and  24  and linking engaging pieces  22  and  23  are provided on a back surface of the lid body  20 . A pair of arm parts  26  is formed on a back side of the supporting body  25 . Each of the arm parts  26  becomes slightly thicker from the middle front to back to an end. A shaft hole  26   a  and a shaft hole  26   b  are provided on opposing inner surfaces of each arm part  26 , positioned front to back, each on a coaxial line. As illustrated in  FIG. 11 , a concave part  25   a  for positioning the protrusion  21 , an engaging part  25   b  for engaging each of the engaging pieces  22 , an engaging part  25   d  for engaging each of the engaging pieces  23 , and a rib  25   c  for engaging each of the protrusions  24 , and the like, are provided on an upper surface of the supporting body  25 . An escape concave location  27  provided in part of each of the arm parts  26 , and an engaging piece  28  and a regulating piece  29  that protrude forward are provided on a lower surface of the supporting body  25 . 
     Furthermore, the supporting body  25  is mounted to the lid body  20  by engaging the protrusion  21  with the concave part  25   a,  each of the engaging pieces  22  with the engaging part  25   b,  each of the engaging parts  23  with the engaging part  25   d,  and each of the protrusions  24  with the rib  25   c.  The engaging piece  28  includes a locking hole  28   a  that penetrates front to back, and the lid  2  is locked in the closed position when the locking member  18   a  engages with the locking hole  28   a.  The regulating piece  29  regulates inadvertent swinging of the lid  2  by making contact with a corresponding inner surface inside the housing  1  at the closed position of the lid  2 . 
     The base  3  is shaped like a block that fits into the concave part  14  and, as illustrated in  FIG. 8  through  FIG. 10( c ) , and includes a back wall  30  that forms a design surface, side walls  31  and  31  linked to both sides of the back wall  30 , and protruding inner walls  33  and  33  positioned above the back wall  30  to keep an interval  32  between both of the side walls  31 . Both of the side walls  31  are highest on the back wall side, have a front side arranged at the back of the concave part  14  that is lower, and include a vertical groove  37  provided in a high location on the back wall  30  side, a through hole  35  provided above the vertical groove  37  for the insertion and support of a shaft  59 , and a mounting hole  31   a  provided on a front side end surface, and the like. Both of the inner walls  33  include a shaft hole  36  that penetrates on a coaxial line, and a wall part  34  extending downwardly to keep an interval with the side wall  31 . One of the wall parts  34  is long and extends to the same position as a lower surface of the side wall  31  while the other is cut short. A fitting hole  38 , into which the other end  6   c  of a first spring body  6  fits, is provided in the long wall part  34 . A fitting hole  39  that penetrates vertically and into which the other end  7   c  of the second spring body  7  fits is provided in a bottom surface between one of the side walls  33  in a location close to the back wall  30  (see  FIG. 10( a )  through  FIG. 10( c ) ). 
     The base  3  described above is pushed against the concave part  14  so that the groove parts  37  on both sides fit onto the protruding ridges  14   a.  This positions the base  3  in a state where a front lower corner part of each of the side walls  31  is sandwiched between a concave inner surface and the regulating protrusion  14   b,  and mounts the base in the concave part  14  by fitting the protruding ridge  14   a  into the groove part  37 . The base  3  is designed so as not to be inadvertently removed from the concave part  4  by a fastener  19  subsequently being screwed into the mounding hole  31   a  through the mounting hole  14   c  from outside the housing  1 . However, this type of fastener  19  may be omitted. 
     The first link  4  and the second link  5  rotatably support the lid  2  or the supporting body  24  with respect to the base  3 . As illustrated in  FIG. 8  and  FIG. 9( a )  through  FIG. 9( c ) , of these, the link  4  includes a roughly rectangular upper plate part  40 , a middle plate part  41  that is linked to a lower side of the upper plate part  40  and is narrower than the upper plate part  40 , and an arm part  42  that is linked to the middle plate part  41  and extends roughly horizontally. The upper plate part  40  is provided with a shaft part  43  that protrudes on a coaxial line from both side surfaces, and a small protrusion  47  that protrudes below the shaft part  43 . The middle plate part  40  is provided with a shaft part  44  that protrudes on a coaxial line from both lower side surfaces. The arm part  42  includes a flange-shaped part  45  protruding roughly at a right angle from one side of the middle plate part  40  provided on an inner surface side thereof, and a fitting hole  46  that penetrates in a tip width direction. 
     By fitting a dual shaft part  44  in the corresponding shaft hole  36 , the first link  4  described above is rotatably supported by the base  3 . The first spring body  6  is thus assembled to the first link  4  and the base  3 . In other words, the first spring body  6  is a coil spring where one end  6   b  of a coil part  6   a  is regulated to fit into the fitting hole  46  on an arm part side, and the other end  6   c  of the coil part  6   a  is regulated to fit into the fitting hole  38  on a base side and generates a urging force. 
     For the first link  4  described above, each of the upper side shaft parts  43  is fitted into and linked in the shaft hole  26   a  to rotate freely with respect to the supporting body  25 . Note that, in a process where the first link  4  rotates with the shaft part  44  fitted into the base side shaft hole  36  as a fulcrum, the small protrusion  47  makes it easier to reduce frictional resistance and absorb rattling by making contact with, for example, an opposing part of the base  3 . 
     As illustrated in  FIG. 8  and  FIG. 10( a )  through  FIG. 10( c ) , the second link  5  includes a plate body  50  that has a roughly “&lt;” shape when viewed from the side, and a pair of protruding leg parts  51  that protrudes so as to keep a prescribed interval on a lower side of the plate body  50 . As illustrated in  FIG. 1( b ) , the plate body  50 , in the full-open position of the lid  2 , has an outer surface formed into a flat surface (design surface) arranged on a refueling port side, with an opposing inner surface provided with a large number of ribs on an upper side and a cavity formed on a lower side. A shaft part  54  for holding a spring protrudes in the cavity on a coaxial line into both inner surfaces. The plate body  50  also includes shaft parts  53  and  53  that protrude in a coaxial line above both side surfaces, a shaft hole  55  that penetrates in a coaxial line below both sides, and a groove part  56  provided in a vertical direction on a back surface side of each leg part. Furthermore, the plate body  50  and the leg part  51  are formed flush with one another and are provided with a small protrusion  51   a  provided on a portion between the shaft part  53  and the shaft hole  55 , and a small protrusion  51   b  provided on a portion that includes a periphery of the shaft hole  55 . In a process where the second link  5  rotates with the shaft  59  inserted into the base side shaft hole  55  as a fulcrum, the small protrusions  51   a  and  51   b  make it easier to reduce frictional resistance and absorb rattling by making contact with, for example, an opposing part of the base  3 . 
     The second link  5  described above arranges a lower side of the plate body  50  and the leg part  51  between the two side walls  31  with respect to the base  3 , and arranges each of the shaft holes  55  so as to overlap with the corresponding shaft hole  35 . In that state, as illustrated in  FIG. 10( b ) , the second link  5  is supported to rotate freely with the shaft  59  as a fulcrum when the shaft  59  is inserted into the shaft hole  35  and the shaft hole  55  on one side and the shaft hole  55  and the shaft hole  35  on the other side. The second spring body  7  is thus assembled between the second link  5  and the base  3 . In other words, the second spring body  7  is a coil spring where, in a state where a coil part  7   a  is fitted onto and held by the shaft part  54  on both sides, one end  7   b  of a coil part is fitted into and regulated by the groove part  56  of one leg part, and the other end  7   c  of the coil part is fitted into and regulated by the fitting hole  39  on a base side and generates an urging force. Furthermore, with respect to the supporting body  25 , each of the shafts  53  is fitted into and linked with the corresponding shaft hole  26   b  on the support body so as to rotate freely. 
     (Operation) The operation of the lid urging structure according to the invention as described above will be clarified with reference to  FIG. 4  through  FIG. 6( b ) , and  FIG. 13 . 
     (1) With the lid urging structure (reference symbol A in  FIG. 13 ) according to the invention described above, in the closed position where an upper opening of the housing  1  is closed, the lid  2  is locked by the locking means  18  in a state biased in the closing direction, so there is no rattling. When the locking means  18  is unlocked, the lid  2  is pushed slightly in the opening direction by the push  17   a  of the push lifter against the urging force of the spring bodies  6  and  7 , and opens slightly (in  FIG. 13 , the lid opening angle is about 6 degrees). From that state, a user grabs the lid  2  with fingers, or the like, and performs a rotating operation in the opening direction against the urging force. This process, as can be seen from  FIG. 13 , is different from a conventional one in that when the lid  2  is rotated slightly outwardly to the first position against the urging force, a spring stress momentarily becomes weak by being momentarily biased in the opening direction. 
     When the lid  2  is rotated to the second position (in  FIG. 13 , the lid opening angle is about 50 degrees) against the urging force, the urging direction of the spring bodies  6  and  7  reverses, and after that, the lid is rotated to the full-open position through links  4  and  5  by the urging force of the spring bodies  6  and  7 . In this lid urging structure, as is illustrated in  FIG. 13 , the lid opening angle at the full-open position is about 118 degrees, and the lid is biased in the opening direction so that there is no rattling in the full-open position. Furthermore, with this lid urging structure A, bouncing when the lid is fully open is reduced because the lid is more firmly biased in the lid opening direction at the full-open position when compared to a lid urging structure B that uses only the second spring body  6  as an urging member. Note that, with the lid urging structure B, the first position, where the lid opening angle is 10 degrees, is a dead point for the first spring body  6 . Furthermore, with a lid urging structure C, a lid opening angle of 48 degrees is a dead point for the second spring body  7 . 
     (2) If the lid  2  is to be closed again, when the lid is rotated against the urging force from the full-open position to the second position, the urging direction reverses at the second position, and from there, the lid is rotated to the first position by the urging force through the linking members  4  and  5 . After the lid  2  momentarily stops at the first position, the lid is rotated again to the closed position by the urging force of the spring bodies  6  and  7  through the links  4  and  5 . In this way, by stopping the lid  2  momentarily at the first position, the lid urging structure A reduces a striking force against the push lifter  16 , and is thus able to suppress the generation of flapping and abnormal sounds better than the comparison products lid urging structures C and C 1  that rotate the lid from the second position right to the closed position in the conventional manner 
     Furthermore, when compared to the comparison product B, where the first position is at a lid opening angle of 10 degrees, the lid opening angle with the lid urging structure A at the first position is larger, at about 25 degrees, due to an equilibrium of the spring bodies  6  and  7 . Therefore, in an operation that closes the lid  2 , after the lid is rotated from the second position in the closing direction by the urging force and stops momentarily at the first position, the lid is once again rotated in the closing direction by the urging force. With this process, if the lid opening angle at the first position is small at only about 10 degrees, as with the comparison product lid urging structure B, the lid is prone to hitting the push lifter  16  at high speed, rendering the lid difficult to use and impairing a sense of quality. By contrast, since the lid opening angle at the first position has been significantly modified to about 25 degrees in the lid urging structure A of the invention product, the structure can eliminate and mitigate such problems by reducing fluttering and tapping sounds, and is thus effective in providing a sense of quality and preventing finger pinching. 
     (3) The operations of both of the linking members  4  and  5  are similar to those of the two linking members in Patent Document 1, and by regulating and correcting an original opening and closing trajectory through the first link  4 , using the second link  5  to make the opening and closing trajectory of the lid  2  more compact, the lid  2  can be controlled when opening and closing so as not to interfere with an outer panel  8 . Furthermore, in this structure, with the lid  2  at the full-open position through the first and second links  4  and  5  as illustrated in  FIG. 6( b ) , an upper side of the first link  4  abuts the inside in the “&lt;” shape of the plate body  50  of the second link  5 , and a base end edge part of the lid  2  abuts the middle plate part  40  of the first link  4 . As a result, the lid  2  is held stably in the full-open position open at 118 degrees. Furthermore, because the first link  4  is hard to see due to being sandwiched by the lid  2  and the second link  5  in the full-open position in this structure, the structure looks good because the second link  5  arranges a flat design surface on a space side of the housing  1 , and the design surface is nearly flush (a linked surface) with the back wall  30  of the base  3 , which is integrally assembled to the housing  1 , and with a corresponding part of the lid  2 , and the like. 
     As described above, the lid urging structure according to the present invention may be modified in various ways, except for the requirements specified in the claims. For example, although a configuration where a refueling port was arranged in an opening inner part was illustrated as the housing  1 , a configuration where an electric charging port is arranged in the opening inner part is also acceptable. Furthermore, although the lid body  20  was mounted to the supporting body  24  as the lid  2 , a portion equivalent to the supporting body  24  may be formed integrally with the lid body  20 . For example, a part corresponding to a base may be formed integrally with the housing as the base  3 . The specific structure for pivotally supporting the housing or the base is not limited to this form and thus a configuration where the first and second links  4  and  5  are accomplished by having one end pivotally supported by a lid back side and the other end pivotally supported by the housing or the base is also possible. 
     REFERENCE NUMERALS 
       1  . . . Housing ( 10  is a cylindrical part) 
       2  . . . Lid (lid bodies  20  and  25  are supporting bodies) 
       3  . . . Base ( 30  is a main body,  31  is an outer wall, and  33  is an inner wall) 
       4  . . . First link (linking member:  40  is an upper plate part, and  42  is an arm part) 
       5  . . . Second link (linking member:  50  is a plate body,  51  is a leg part, and  56  is a groove part) 
       6  . . . First spring body (urging member:  6   b  is one end, and  6   c  is the other end) 
       7  . . . Second spring body (urging member:  7   b  is one end, and  7   c  is the other end) 
       8  . . . Outer panel 
       9  . . . Attaching frame 
       17  . . . Push lifter 
       18  . . . Locking means 
       34  . . . Wall part 
       36  . . . Shaft hole 
       38  . . . Fitting hole 
       39  . . . Fitting hole 
       43  . . . Shaft part 
       44  . . . Shaft part 
       46  . . . Fitting hole 
       53  . . . Shaft part 
       54  . . . Shaft part 
       55  . . . Shaft hole 
       59  . . . Shaft (pivot shaft) 
     Note that all of the content of the Specification, Scope of Claims, Drawings, and Abstract of Japanese Patent Application No. 2018-107393 submitted on Jun. 5, 2018 are cited herein, and have been incorporated as a disclosure of the Specification of the present invention.