JP2011213235A - Mistaken oil supply preventive device of oil supply port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mistaken oil supply preventive device capable of permitting insertion of a light oil supply gun and preventing insertion of a gasoline supply gun only by the presence/absence of the pressure at a specified part.SOLUTION: The mistaken oil supply preventive device 2 prevents a gasoline supply gun 5 from being inserted in an oil supply port of a fuel supply pipe even when a light oil supply gun 4 can be inserted therein, and includes two or more regulating blocks 23 projecting inwardly in the radial direction of the oil supply port from the uniform position in the circumferential direction of the oil supply port, a housing 24 capable of movably holding the regulating blocks 23 inwardly in the radial direction, downwardly and rotatably, and outwardly in the radial direction of the oil supply port, and a torsional coil spring 25 which is supported by the housing 24 to urge the regulating blocks 23 upwardly and inwardly in the radial direction of the oil supply port.

Description

  The present invention prevents insertion of a small-diameter fuel gun (for example, a gasoline fuel gun in Europe and the US) even if a large-diameter fuel gun (for example, a light oil fuel gun in the US and Europe) can be inserted into the fuel filler port of the fuel oil pipe. The present invention relates to an erroneous oiling prevention device.

  In Europe and the United States, the outer diameter of the gasoline oil gun is relatively smaller than the outer diameter of the light oil gun (for example, the outer diameter of the light oil gun = 22 mm, the outer diameter of the gasoline oil gun = 20 mm), In a vehicle that uses light oil as a fuel, a fuel supply prevention device is installed at the fuel supply port of the fuel supply pipe so that even if the light oil supply gun can be inserted into the fuel supply port, the gasoline supply gun cannot be inserted. (In the case of automobiles that use gasoline as fuel, there is no problem because the fuel filler port is made to match the gasoline fuel gun with a small outside diameter, so the light oil gun can not be inserted basically.) . Various configurations of the misfueling prevention device have been proposed. For example, configurations described in Patent Document 1 or Patent Document 2 can be exemplified.

  Patent Document 1 discloses an erroneous fueling prevention device that includes a pair of levers (Hebel (40)) provided at a fueling port. The lever has a blocking part (Blockierelement (46)) that closes the filler opening and a control part (Betatigungselement (48)) that is pushed by a light oil fueling gun with a large outer diameter, and is normally a spring member (Federelement (60)) Is biased inward. As a result, the fuel oil gun for light oil pushes the control part, pushes the lever outwardly against the urging of the spring member, and can be inserted deeply into the oil supply opening. It hits the blocking part without being pushed, so that it cannot be inserted deeply into the oil filler opening (Patent Document 1, Claim 1, FIG. 1 and FIG. 2).

Patent Document 2 describes an erroneous oiling prevention device (retention arms (103)) provided in the opening (aperture (102)) of a base member (foundation (101)) attached to a fueling port ( Nozzle inhibitor (10)) is disclosed. The holding member is a cam inclined surface (inclined) that is pushed by a light oil supply gun with a large outer diameter.
A cam ramp (104)) is supported by the opening, and a hook (105) is provided at the tip. As a result, the light oil fuel gun can push the cam slant surface to push open the holding member, retract the hook outward, and insert it deep into the fuel filler port, but the gasoline oil gun does not push the cam slope. The hook engages with the hook so that it cannot be inserted deeply into the oil filler opening (Patent Document 2, [0027] [0028], FIGS. 4 to 7).

German Utility Model Application Publication No. 202005014387 Specification U.S. Pat. No. 7,030,277

  The erroneous oiling prevention device disclosed in Patent Document 1 pushes the lever open against the biasing force of the spring member when the control part is pushed by the light oiling gun with a constant pressing force. Further, the erroneous oiling prevention device disclosed in Patent Document 2 is elastically deformed when the cam inclined surface is pressed against the light oil supply gun with a constant pressing force, and pushes the holding member open. Both are common in that the lever or holding member is pushed open by applying a certain pressing force to a specific part of the lever or holding member. It is devised not to be added to.

  In other words, even with the misfueling prevention device disclosed in Patent Literature 1 and Patent Literature 2, if a certain pressing force can be applied to a specific part of the lever or holding member with a gasoline fuel gun, the lever or holding member is pushed open. Can do. For this reason, the erroneous oiling prevention device disclosed in Patent Document 1 is provided with a protrusion (Zapfen (49)) at the tip of the blocking portion, and the erroneous oiling prevention device disclosed in Patent Literature 2 is provided with a hook as described above. Even if one lever or a part of the holding member is pushed open, the inside of the gasoline fuel gun is engaged with the protrusion of the other lever or the hook of the remaining holding member so that the insertion can be prevented. .

  However, the formation of the protrusions or hooks complicates the structure of the lever and the holding member, and generally there are no restrictions inside the gasoline fuel gun, so there are cases where the protrusions and hooks cannot be engaged properly. Further, an erroneous oiling prevention device that pushes and opens the lever or the holding member when a certain pressing force is applied to the specific part and does not open the lever or the holding member otherwise, the urging force or elastic deformation force that opposes the pressing force is aged over time. If it changes, there is a possibility that it may not work well, and there is a doubt about the stability of the work that prevents misfueling. Therefore, in order to develop a mis-lubrication prevention device that allows insertion of a light oil fuel gun and prevents the insertion of a gasoline fuel gun only by the presence or absence of a pressing of a specific part, not the degree of pressing force that pushes a specific part. did.

  As a result of the study, the oil that was developed is an erroneous refueling that prevents a gasoline fuel gun (small-diameter fuel gun) from being inserted even if a light oil fuel gun (large-diameter fuel gun) can be inserted into the fuel filler port. Two or more restricting blocks protruding inward in the radial direction of the oil filler port from the circumferentially uniform position of the filler port, the restricting block being rotatable inward and downward in the radial direction, and radially outward of the filler port A misfueling prevention device comprising a housing that is movably held in a direction and an elastic member that is supported by the housing and biases the regulating block upward and inward in the radial direction of the fuel filler opening. The erroneous oiling prevention device of the present invention is different from the lever and holding member disclosed in Patent Document 1 or Patent Document 2 in that the restriction block is rotatable and movable with respect to the housing.

  The restriction block of the present invention has a release surface that engages with a large-diameter fuel gun that is aligned with the fuel supply port and the axis in a posture (hereinafter referred to as a reference posture) that is flipped upward by an elastic member. A restricting surface that engages a small-diameter oil gun with the same axis is projected radially inward and horizontally from the release surface, a rotating shaft is projected from the side, and a stopper is provided radially outward from the rotating shaft. A restriction groove that extends outward in the radial direction of the filler opening and guides the rotation axis of the restriction block is provided, the rotation axis is brought close to the inner end in the radial direction of the slide groove, and the restriction is in a posture of being lifted upward by an elastic member. A stopper stop that engages the stopper of the block is provided.

  The elastic member is externally fitted to the rotation shaft, engages one end lowered radially inward from the rotation shaft of the restriction block, and engages the other end lowered radially outward from the radially outer end of the slide groove of the housing. An example is a coil spring. Since the elastic member has a function of urging the restriction block upward and radially inward to return to the reference posture, when the elastic member is a torsion coil spring, the elastic member is engaged with the housing from one end engaged with the restriction block. The edges are lowered and repelled radially inward and obliquely upward as a whole. The slide groove only needs to be able to guide the rotating shaft and move the restricting block radially outward until the stopper is removed from the stopper provided on the housing, so that the depth of the notch is increased in the direction in which the stopper is removed from the stopper. A length equal to the length may be provided. The stopper stop is a protrusion provided radially outward from the rotation shaft, specifically, radially outward from the radially outer end of the slide groove, and engages the stopper from above. Since the stopper needs to be disengaged from the stopper stop by bringing the rotation shaft toward the radially outer end of the slide groove, the engaging range of the stopper and the stopper stop is made equal to or less than the length of the slide groove.

  The restricting block is normally in a reference posture with the rotating shaft brought close to the radially inner end of the slide groove, and projects inward in the radial direction to close the fuel filler opening. At this time, the restricting block engages a stopper provided on the outer side in the radial direction with respect to the rotating shaft with the stopper of the housing, and maintains the radially inward protruding state. Since the restriction block is moved radially outward to remove the stopper from the stopper stop, the restriction block cannot be rotated radially inward and downward unless the stopper is completely removed from the stopper stop. The fuel oil gun for light oil pushes the release surface and applies radial outward movement to the restriction block, so that the restriction block is moved outward in the radial direction and the stopper is removed from the stopper stop (hereinafter referred to as the retracted position). Then, push the release surface or restricting surface as it is to move the rotation shaft to the radially outer end of the slide groove, and further rotate the restricting block inward and downward in the radial direction to make the restricting surface of the restricting block the radius of the filler hole. Escape the direction outward. Thus, the light oil supply gun can be inserted as far as the oil supply port.

  On the other hand, since the gasoline refueling gun only pushes the horizontal restricting surface downward, it cannot give a radially outward movement to the restricting block, and the restricting block cannot be moved to the retracted posture. The insertion is prevented by the restriction block in the reference posture protruding inward in the radial direction of the fuel filler opening. The restriction block protrudes inward in the radial direction from the circumferentially uniform position of the filler opening (may be shifted by ± 10 degrees from the uniform position depending on the design specifications), for example, the two restriction blocks face each other. It is in a positional relationship. From now on, if the gasoline refueling gun is squeezed, the release surface of one of the restriction blocks will be pushed into the retracted posture, and even if the release surface of the other restriction block cannot be pushed even when retracted radially outward, The remaining other control block can maintain the reference posture and prevent the gasoline fuel gun from being inserted. For this reason, the shortest distance between the inner peripheral surface of the fuel filler opening and the radially inner end of the disclosure surface of the restriction block that maintains the reference posture is made smaller than the outer diameter of the gasoline fuel gun.

  As will be understood from the above, the misfueling prevention device of the present invention moves outward in the radial direction when the release surface is pressed and shifts to the retracted position, and does not move outward in the radial direction when the restriction surface is pressed. The control block that maintains the standard posture is equipped with technical features. These restriction blocks are in the standard posture and are located radially outward from the outer diameter of the gasoline fuel gun with the fuel inlet and axis aligned, and radially inward from the outer diameter of the diesel fuel gun with the same fuel inlet and axis aligned. When the restriction block is made of synthetic resin with a friction coefficient of 0.2 by having a release surface with an upward slope greater than 45 degrees radially outward from the release surface, which is a component of the force that the light oil supply gun pushes The friction force with respect to the along force is about 20% or less, and the tip of the light oil supply gun can be slid along the release surface, and the restriction block can be pushed into the back of the oil supply port without being aware of friction resistance.

  When the ascending slope of the release surface is greater than 45 degrees and the frictional force is reduced, the force perpendicular to the release surface that moves the restriction block radially outward is rapidly reduced. From this, when the restriction block is made of a synthetic resin having a friction coefficient of 0.2, the preferable upward gradient of the release surface is 60 degrees to 80 degrees when the restriction block is in the reference posture. When the upward gradient is greater than 60 degrees, the frictional force against the force along the release surface, which is the component force of the light oil supply gun, is about 10% or less, and the frictional resistance can be almost ignored. In addition, when the upward gradient is greater than 80 degrees, the force perpendicular to the release surface that moves the restriction block radially outward decreases, and the force that pushes the restriction block outward in the radial direction is less than the pushing force of the light oil supply gun. It becomes about 17% or less, and it becomes difficult to move the restriction block outward in the radial direction.

  The housing holds the restriction block and specifies the positional relationship of the restriction block with respect to the fuel filler opening. In addition to this, the housing is aligned with the fuel filler opening and the axis, and by supporting the alignment ring whose inner peripheral edge equally intersects with the release surface of each regulation block, all the oil guns for light oil inserted toward the regulation block are all The release surface of the restriction block can be pushed equally. The alignment ring regulates the insertion position of the light oil supply gun and the gasoline supply gun with respect to the erroneous oil supply prevention device provided at the oil supply port so that the erroneous oil supply prevention device operates correctly.

  The erroneous fueling prevention device of the present invention reliably prevents the gasoline fueling gun from being inserted while allowing the light fueling gun to be inserted into the fueling port. This is an effect obtained by combining the two types of movements of rotation and movement in order to retract the restriction block and releasing the stopper in the process of shifting from the reference posture to the retracted posture. More specifically, the regulation block that is rotatable and movable with respect to the housing can only press the release surface by the light oil supply gun, and only when the release surface is pressed, the stopper is released and the reference block is released. It is possible to move from the attitude to the retracted position and retract outward in the radial direction of the fuel filler port, but with the gasoline fuel gun, only the regulating surface can be pushed, the stopper cannot be released, This is due to the fact that the reference posture protruding in the direction is maintained. In this way, the erroneous fueling prevention device of the present invention can surely prevent the insertion of the gasoline fueling gun, in particular, as compared with the equivalent device disclosed in Patent Literature 1 or Patent Literature 2.

It is a vertical sectional view of a fuel filler opening with a built-in misfuel prevention device according to the present invention. It is a top view of the fueling opening of this example. It is a vertical sectional view showing the assembling relationship of each part in the erroneous oiling prevention device. It is a perspective view showing the assembly | attachment relationship of the control block and housing in an incorrect oiling prevention apparatus. It is a vertical sectional view of a restriction block and a housing in a standard posture. FIG. 2 is a vertical sectional view corresponding to FIG. 1 showing a stage in which a light oil gun is inserted until it comes into contact with a release surface of a restriction block in a reference posture. FIG. 5 is a partially enlarged side view (a side view on the front side of the drawing is omitted) showing a restriction block at a stage where a light oil gun is inserted until it comes into contact with a release surface of the restriction block in a reference posture. FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing a stage where a restriction block is pushed radially outward by being pushed by a light oil gun. FIG. 9 is a partially enlarged side view corresponding to FIG. 8 showing the restriction block at the stage when the restriction block is pushed by the light oil gun and moved radially outward (the side on the front side of the drawing is omitted). FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing a stage in which the light oil gun is rotated by being pushed by the light oil gun, and the restriction block shifts to a retracted posture. FIG. 9 is a partially enlarged side view corresponding to FIG. 8 showing a restriction block at a stage where the restriction block is pushed and rotated by the light oil gun and is shifted to a retracted posture (a side on the front side of the drawing is omitted). FIG. 2 is a vertical sectional view corresponding to FIG. 1 showing a stage in which a gasoline gun is inserted until it comes into contact with a restriction surface of a restriction block in a reference posture. FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing a stage in which a gasoline fuel gun is inserted with an axis line shifted from a fuel filler port.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, for example, the erroneous fueling prevention device 2 of the present invention is used in combination with a fuel filler opening / closing device 3 provided with an on-off valve 33 that is pushed downward by an inserted light oil fueling gun 4. Used. In this example, a fuel supply pipe end 1 formed by expanding a steel pipe fuel supply pipe in multiple stages is engaged with the peripheral surface of the lower main body 31 at the step and the fuel supply opening / closing device 3 is fitted in the lower stage. The upper body 21 is placed on the lower body 31, and the erroneous oil supply prevention device 2 is fitted on the upper stage. The oil filler port is an opening (see FIG. 2) provided in the upper main body 21 constituting the erroneous oil prevention device 2, and the inside of the alignment ring 22 of the erroneous oil prevention device 2 and the housing 24 that supports the restriction block 23 are provided. And communicates with the upper surface opening 32 and the lower surface opening 34 of the fuel filler opening and closing device 3.

  The fuel filler opening / closing device 3 has an opening / closing valve 32 with the upper surface opening 32 of the resin lower body 31 formed by assembling an upper face plate provided with an upper surface opening 32 and a lower cylinder provided with a lower surface opening 34 as a valve seat. This is a configuration provided. The on-off valve 32 has a structure in which a valve seal ring 331 is mounted on a valve body, is pivotally supported near the upper surface opening 32, and is biased upward by a torsion coil spring (not shown). As a result, it is pushed by the light oil supply gun 4 inserted beyond the restriction block 23 and rotated downward to open the upper surface opening 32, that is, the oil supply opening (see FIG. 11), and the light oil supply gun 4 is pulled out. Then, it rotates upward due to the urging force, and presses the valve seal ring 331 around the upper surface opening 32 to close the upper surface opening 32, that is, the fuel filler port. The lower main body 31 is provided with a main body seal ring 311 on the outer periphery of the upper edge, and when the upper surface opening 32 is blocked by the on-off valve 33, the oil supply pipe end 1 is airtight.

  As shown in FIGS. 1 to 3, the erroneous fueling prevention device 2 is an upper part that is a cylindrical resin block in which eight reinforcing ribs 211 extending radially around the opening serving as a fueling port are provided at equal intervals in the circumferential direction. The main body 21 has two restriction blocks 23 and 23 projecting inward in the radial direction of the oil supply port from the circumferential position of the oil supply port, and each control block 23 can be rotated inward and downward in the radial direction and the radius of the oil supply port. The housing 24 is configured to include a housing 24 that is movably held outward in the direction, and a torsion coil spring 25 that is supported by each housing 24 and biases the restriction block 23 upward and radially inward of the fuel filler opening. The reinforcing rib 211 is partly cut out on the radially inner side, forms an annular space with the upper surface of the housing 24 attached to the upper main body 21, and fits the alignment ring 22.

  The alignment ring 22 is a rubber ring whose inner peripheral edge equally intersects with the release surface 232 of the restriction block 23 in the reference posture when the fuel filler opening and the axis line are aligned. The alignment ring 22 of the present example is opposed to elastic pieces 221 and 221 having a semicircular shape in plan view and a downwardly inclined downward in the radial direction in a plan view, with an inner diameter at which an inner peripheral edge can be inserted without resistance. A pair protrudes due to the positional relationship. Since the elastic piece 221 is made of rubber integral with the ring body, for example, it is a portion that is elastically deformed when pressed from above by the light oil supply gun 4, and the shortest distance between the elastic pieces 221 and 221 at the opposite positions is used for small diameter gasoline. The length is such that the refueling gun 5 can be inserted without resistance. Accordingly, the light oil supply gun 4 is inserted while deforming the elastic piece 221 to align the axis with the oil supply port, and the gasoline oil supply gun 5 is inserted so as not to deform the elastic piece 221 and the axis is aligned with the oil supply port. Can do.

  The restriction block 23 is mounted on a rectangular parallelepiped housing 24, inserted between the housing guides 212 and 212 provided on the inner peripheral surface of the upper body 21, the housing 24 is inserted, and the lower edge is engaged by the latching claw 213. By adhering 24 to the inner peripheral surface of the upper main body 21, it protrudes inward in the radial direction of the fuel filler port from a position facing the fuel filler port. As shown in FIGS. 4 and 5, the restriction block 23 of the present example is made of a resin in which a pair of flanges 235 and 235 protrudes rearward from the left and right edges of the release surface 232 that rises obliquely upward from the horizontal restriction surface 231. In the block, a cylindrical rotating shaft 233 is projected symmetrically from the outer surface of the flange 235, and a stopper 234 is bridged between the rear ends of the flanges 235 and 235. In addition, in the restriction block 23 of this example, a spring fitting protrusion for fitting and holding the torsion coil spring 25 is protruded coaxially with the rotary shaft 233 on the inner surface of the flange 235.

  The housing 24 is configured by assembling a left frame body 244 having an intermediate part back surface and a right frame body 245 having an intermediate part upper surface in order to mount the regulation block 23. Unlike the present example, the rear surface of the intermediate portion and the upper surface of the intermediate portion are intermediate portions of the housing 24 that connect the side plate of the left frame body 244 and the side plate of the right frame body. The rear surface of the intermediate portion may be provided, or the upper surface of the intermediate portion and the rear surface of the intermediate portion may be configured as separate intermediate members that are independent from the side plates of the left frame body 244 and the right frame body. The left frame body 244 includes a side plate that is a resin plate surface that is rectangular in a side view, and a resin intermediate back surface that protrudes from the lower half of the rear edge of the side plate toward the right frame body 245. A slide groove 241 for guiding the shaft 233 is provided on the side plate. The slide groove 241 is a long hole that guides the rotary shaft 233, and is provided along the radial direction (that is, the slide groove 241 is provided horizontally).

  The right frame body 245 includes a side plate that is a resin plate surface that is rectangular in a side view, and a resin intermediate upper surface that protrudes toward the left frame body 244 from the upper half of the upper edge of the side plate. A slide groove 241 for guiding 233 is provided on the side plate, and a stopper stop 242 having an arcuate cross section that engages with the stopper 234 of the restriction block 23 from above is provided on the rear edge of the intermediate upper surface. Like the left frame 245 described above, the slide groove 241 is a long hole that guides the rotation shaft 233 and is provided along the radial direction (that is, the slide groove 241 is provided horizontally). The stopper stop restricts the amount of rotation of the restriction block 23 that rotates upward by the bias of the torsion coil spring 25 by bringing the stopper 234 of the restriction block 23 into contact.

  As shown in FIG. 5, the torsion coil spring 25 has a winding portion fitted to a spring fitting protrusion 236 that protrudes to the inner surface side of the flange 235 of the restriction block 23, and the restriction block 23 rotates from the winding portion. The end lowered from the shaft 233 radially inward to the inner surface of the release surface 232, and the start end lowered from the winding portion to the radially outer end of the slide groove 241 of the housing 24 in the radial direction is also perpendicular to the right frame 245. It is addressed to the inside of the surface. The torsion coil spring 25 of this example has a starting end lower than the end, and biases the restricting block 23 inward in the radial direction and obliquely upward as a whole.

  The release surface 232 in this example is a reference posture in which the restriction block 23 is flipped up by the urging of the torsion coil spring 25, and is also oiled on the outer side in the radial direction from the outer diameter of the gasoline fuel gun 5 aligned with the fuel filler port and the axis. The gradient angle α is an ascending gradient of 75 degrees from the radially inner position to the radially outward position from the outer diameter of the light oil supply gun 4 with the opening aligned with the axis (see FIG. 7). Further, the restriction surface 231 of the present example closes the fuel filler opening with a pair of restriction surfaces 231 on the upper surface side of the plate surface that protrudes radially inward and horizontally from the release surface 232 in the same reference posture as described above. (See FIG. 2). Since the light oil supply gun 4 and the gasoline supply gun 5 are in contact with only the upper surface side of the plate surface, that is, the regulation surface 231, for example, a plurality of rods that protrude radially inward and horizontally from the release surface 232 It is also conceivable that a virtual surface following each upper edge is used as the restriction surface 231.

  The operation of the erroneous oiling prevention device 2 of this example will be described. In the normal fueling prevention device 2 of the present example, the rotating shaft 233 is normally in the reference position with the radially inner end of the slide groove 241 in the normal posture, and the fueling port is closed by the regulating surface 231 projecting inward in the radial direction ( (See FIG. 2). At this time, the restriction block 23 engages the stopper 234 with the stopper stop 242 to maintain a radially inward protruding state. As shown in FIGS. 6 and 7, the light oil supply gun 4 is inserted while elastically deforming the elastic pieces 221 of the alignment ring 22 while aligning the fuel supply port and the axis, and releasing the pair of restriction blocks 23. The outer edges are brought into contact with the surfaces 232 and 232, respectively. Since the outer diameter of the light oil supply gun 4 and the inner diameter of the alignment ring 22 are substantially the same, the light oil supply gun 4 cannot be inserted into the oil supply port by elastically deforming only one of the elastic pieces 221, and a pair of elastic pieces Since light oil gun 4 can be inserted into the oil supply port only when 221 is elastically deformed evenly, the fuel oil port 4 and the axis line coincide.

  When the light oil supply gun 4 having the outer edges abutted against the release surfaces 232 and 232 of the pair of restriction blocks 23 is kept lowered as it is, the light oil supply gun 4 causes the release surfaces 232 to move as shown in FIGS. Pushing radially outward, moving the restricting block 23 radially outward against the bias of the torsion coil spring 25, and moving the restricting block 23 to the retracted position in which the stopper 234 is displaced radially outward from the stopper stop 242 Transition. If the light oil supply gun 4 continues to descend as it is, the restriction surface 231 of the restriction block 23 which is not restrained by engaging the stopper 234 with the stopper stop 242 is pushed by the light oil supply gun 4.

  Accordingly, as shown in FIGS. 10 and 11, the light oil supply gun 4 moves the contact block from the release surface 232 to the control surface 231, and moves the restriction block 23 in the retracted posture inward in the radial direction of the oil supply port. By rotating downward, the regulating surface 231 is retracted radially outward of the fuel filler opening. Thus, the light oil supply gun 4 that can be further lowered can be lowered and pushed open the opening / closing valve 33 of the oil supply opening / closing device 3 and inserted into the interior of the oil supply opening. The restriction block 23 returns to the reference posture by urging the torsion coil spring 25 by pulling out the light oil supply gun 4. Similarly, the opening / closing valve 33 of the filler opening / closing device 3 is also in a reference state (a state in which the upper surface opening 32 that is a valve seat is closed) according to the bias of a torsion coil spring (not shown) by pulling out the light oil supply gun 4. Return to.

  As shown in FIG. 12, the gasoline fuel gun 5 is inserted while avoiding the elastic piece 221 of the alignment ring 22 while aligning the fuel inlet and the axis, and abuts the outer edges on the regulation surfaces 231 and 231 of the pair of regulation blocks 23, respectively. Let Since the outer diameter of the gasoline fuel gun 5 and the shortest distance between the elastic pieces 221 and 221 at the position facing the alignment ring 22 are substantially the same, the gasoline fuel gun 5 does not deform both elastic pieces 221. If inserted, the fuel filler opening and the axis can be matched. In the gasoline fuel gun 5 in which the outer edges are in contact with the restriction surfaces 231 and 231 of the pair of restriction blocks 23 in this way, the stoppers 234 of the restriction blocks 23 are not detached from the stopper stops 242. Cannot be rotated, and cannot even be moved radially outward to a retracted position. In this way, the gasoline fuel gun 5 is prevented from being inserted all the way into the fuel filler port.

  Here, it is conceivable that only one elastic piece 211 in the alignment ring 22 is deformed and the gasoline fuel gun 5 is twisted or the fuel filler port and the axis are shifted. In this case, as shown in FIG. 13, the gasoline refueling gun 5 pushes the release surface 232 of one restriction block 23 (the right restriction block 23 in FIG. 13) to the retracted position, and further pushes the restriction surface 231 to rotate. Thus, the one restriction block 23 can be retracted. However, the release surface 232 of the other remaining restriction block 23 (left restriction block 23 in FIG. 13) cannot be pushed, and insertion is blocked by the remaining other restriction block 23. From this, the length that each restriction block 23 protrudes from the inner peripheral surface of the filler opening (= the inner peripheral edge of the alignment ring 22) is the release of the restriction block 23 that maintains the reference posture (for example, the restriction block 23 on the left side in FIG. 13). The shortest distance between the radially inner end of the surface 232 (the lower end edge from which the regulating surface 231 protrudes) and the inner peripheral surface of the fuel filler port is set to be smaller than the outer diameter of the gasoline fuel gun 5. The setting is easy because there is no restriction on the radially inner end of the release surface 232.

1 Oil supply pipe end 2 Misfueling prevention device
21 Upper body
22 Alignment ring
23 Regulatory block
24 Housing
25 Torsion coil spring 3 Oil filler opening and closing device
31 Lower body
32 Top opening
33 On-off valve
34 Opening on the bottom 4 Light oil supply gun (Large diameter oil supply gun)
5 Gasoline refueling gun (small-diameter refueling gun)
α Uphill angle of release surface

Claims (3)

An erroneous oiling prevention device that prevents insertion of a small-diameter fuel gun even if a large-diameter fuel gun can be inserted into the fuel filler port of the fuel supply pipe,
Two or more restricting blocks projecting radially inward of the filler port from the circumferential position of the filler port, a housing for holding the restrictor block so as to be rotatable downward and movable radially outward of the filler port, and a housing And an elastic member that urges the restriction block upward and radially inward of the fuel filler port,
The restricting block has a release surface that engages with a large-diameter oil gun that is aligned with the oil supply port and the axis in a posture that is bounced upward by an elastic member, and also has a small-diameter oil gun that is aligned with the oil supply port and the axis. The engaging restricting surface protrudes radially inward and horizontally from the release surface, the rotating shaft protrudes from the side surface, and a stopper is provided radially outward from the rotating shaft,
The housing is provided with a slide groove that extends outward in the radial direction of the oil filler port and guides the rotation axis of the restriction block. The rotation axis is brought close to the radially inner end of the slide groove, and the housing is moved upward by an elastic member. An erroneous oiling prevention device comprising a stopper stopper that engages with a stopper of a certain restriction block. The restriction block is in a posture that is flipped upward by the elastic member, and is radially outward from the outer diameter of the small-diameter oil gun aligned with the oil supply port and the axis, and is also the same as that of the large-diameter oil gun aligned with the oil supply port and the axis. The erroneous oiling prevention device according to claim 1, further comprising a release surface having an upward slope greater than 45 degrees radially outward from a position radially inward of the outer diameter. 3. The misfueling prevention apparatus according to claim 1, wherein the housing has an oiling port and an axis line aligned, and an alignment ring that supports the centering ring whose inner peripheral edge equally intersects with a release surface of each of the restriction blocks.

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