Swivel joint for oil supply nozzle
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Filing Date
- 2024-10-24
- Publication Date
- 2026-06-22
Abstract
Description
Fuel nozzle swivel joint
[0001] The present invention relates to a swivel joint used when connecting a fuel filler nozzle of a fuel filler device to the tip of a fuel filler hose.
[0002] A fuel nozzle connected to the tip of a fuel hose via a swivel joint is very useful because it improves the operability of the fuel nozzle and expands the fuel supply range (see, for example, Patent Document 1). In such a swivel joint, a lubricant such as grease is filled in the area where the rotating body (ball) is located to ensure smooth rotation.
[0003] However, lubricating oil may leak from the end of the swivel joint. Unlike fuel oil leakage, lubricating oil leakage does not cause serious problems and does not adversely affect the safety of refueling operations. However, users of the refueling equipment may mistake the lubricating oil leakage for fuel oil leakage, develop distrust for the refueling equipment, and complain to the refueling facility.
[0004] Furthermore, rainwater or salty water may seep into the swivel joint from the end of the swivel joint via a path in the opposite direction to the lubricating oil leak, potentially causing rust on the swivel joint's iron ball. Rusting of the ball hinders the smooth rotation of the swivel joint and impairs the operability of the fuel nozzle. Furthermore, disinfectants sprayed on fuel nozzles by fueling facility staff as an infection control measure may contain ingredients that break down grease. If these ingredients seep into the swivel joint from the end, they can break down the lubricating oil and hinder the smooth rotation of the swivel joint.
[0005] The fuel nozzle (Patent Document 1), which is connected to the tip of a fuel hose via a swivel joint, is not intended to solve the problems of lubricating oil leaking from the end of the swivel joint and of rainwater, salty water, disinfectants containing components that break down grease, etc. seeping into the swivel joint through the end of the swivel joint.
[0006] Japanese Unexamined Patent Publication No. 183399 / 1983
[0007] The present invention has been proposed in consideration of the problems of the prior art described above, and aims to provide a swivel joint for a fuel nozzle that can prevent lubricating oil from leaking from the end of the swivel joint and the intrusion of rainwater, salty water, disinfectants containing components that decompose grease, etc. through the end of the swivel joint.
[0008] The swivel joint (10) for a fuel filler nozzle of the present invention comprises a cylindrical main body (2), a hollow fuel filler nozzle side bushing (1) that fits into the fuel filler nozzle side end (2A) of the main body (2), a hollow fuel filler hose side bushing (3) that fits into the fuel filler hose side end (2B) of the main body (2), a rotor (7) that is interposed between the fitting surfaces of the main body (2) and the fuel filler nozzle side bushing (1) and the fitting surfaces of the main body (2) and the fuel filler hose side bushing (3) and allows relative rotation between the main body (2) and the fuel filler nozzle side bushing (1) and between the main body (2) and the fuel filler hose side bushing (3), and rotor accommodating portions (4, 5) that accommodate the rotor and lubricating oil, and is characterized in that dust seals (9) are provided on the fitting surfaces of the main body (2) and the fuel filler nozzle side bushing (1) in a region extending from a point where the rotor accommodating portion (4) is located toward the fuel filler nozzle side end (2A) of the main body (2), and on the fitting surfaces of the main body (2) and the fuel filler hose side bushing (3) in a region extending from a point where the rotor accommodating portion (5) is located toward the fuel filler hose side end (2B) of the main body (2).
[0009] In the present invention, the dust seal 8 arranged on the mating surface between the main body 2 and the fuel filler nozzle side bush 1 in the region extending from the location where the rotor accommodating portion 4 is located toward the fuel filler nozzle side end 2A of the main body 2, and the dust seal 9 arranged on the mating surface between the main body 2 and the fuel filler hose side bush 3 in the region extending from the location where the rotor accommodating portion 5 is located toward the fuel filler hose side end 2B of the main body 2, are preferably gaskets that are annular overall and have a U-shaped cross section.
[0010] Furthermore, it is preferable that the dust seal 8 arranged on the mating surface between the main body 2 and the fuel filler nozzle side bush 1 in the region from the location where the rotor accommodating section 4 is located toward the fuel filler nozzle side end 2A of the main body 2 is arranged closer to the fuel filler nozzle side rotor accommodating section 4 than the end face 2AA of the fuel filler nozzle side end 2A of the main body 2, and that the dust seal 9 arranged on the mating surface between the main body 2 and the fuel filler hose side bush 3 in the region from the location where the rotor accommodating section 5 is located toward the fuel filler hose side end 2B of the main body 2 is arranged closer to the fuel filler hose side rotor accommodating section 5 than the end face of the fuel filler hose side end 2B of the main body 2.
[0011] According to the fuel filler nozzle swivel joint 10 of the present invention having the above-mentioned configuration, dust seals 8, 9 are arranged on the fitting surface of the main body 2 and the fuel filler nozzle side bushing 1 in the region extending from the point where the rotor accommodating portion 4 is located toward the fuel filler nozzle side end 2A of the main body 2, and on the fitting surface of the main body 2 and the fuel filler hose side bushing 3 in the region extending from the point where the rotor accommodating portion 5 is located toward the fuel filler hose side end 2B of the main body 2.As a result, the lubricating oil contained in the nozzle side rotor accommodating portion 4 and the fuel filler hose side rotor accommodating portion 5 is sealed in each of the above regions and prevented from leaking outside the swivel joint 10.
[0012] Furthermore, the dust seal 8 on the fuel filler nozzle side and the dust seal 9 on the fuel filler hose side prevent rainwater, salty water, disinfectant, etc. from penetrating from the outside into the interior (rotating body housings 4, 5) of the seals 8, 9. This prevents rusting of the borders on the interior (rotating body housings 4, 5) of the seals 8, 9 and prevents the lubricating oil contained in the rotating body housings 4, 5 from being decomposed by components of the disinfectant.
[0013] Furthermore, the dust seal 8 on the fuel filler nozzle side is not provided at a position corresponding to the end face 2AA of the main body 2, and the dust seal 9 on the fuel filler hose side is not provided at a position corresponding to the end face of the fuel filler hose side end 2B of the main body 2. Therefore, particularly when the dust seals 8, 9 are U-packings, the lip of the U-packing is prevented from entering the gap that occurs between the bushings 1, 3 and the end face 2AA of the main body 2, and there is no risk of losing the sealing performance of the U-packing.
[0014] FIG. 10 is a cross-sectional view showing an example of a swivel joint for a fuel filler nozzle of the related art. FIG. 11 is a cross-sectional view showing an embodiment of a swivel joint for a fuel filler nozzle according to the present invention. FIG. 12 is a view showing the disadvantages of an X-packing in comparison with a U-packing. FIG. 13 is a view of a U-packing of a different type from that shown in FIG. 3. FIG. 14 is a partial cross-sectional view showing a state in which a U-packing is provided in the vicinity of an end of the main body. FIG. 15 is a partial cross-sectional view showing a problem that occurs when a U-packing is provided at a position separated from the end of the main body. FIG. 16 is a partial cross-sectional view showing a problem that occurs when a U-packing is provided at a position corresponding to the end face of the main body. FIG. 17 is an enlarged partial cross-sectional view showing a gap that occurs between the end face of the main body and the end face of the bushing protruding portion due to tolerance in the state shown in FIG. 18. FIG. 19 is an enlarged partial cross-sectional view showing a state in which the lip of the U-packing has entered the gap between the end face of the main body and the end face of the bushing protruding portion in the state shown in FIG. 19. FIG. 20 is an enlarged partial cross-sectional view showing the distance between the end face of a groove that accommodates the U-packing and an extension line of the end face of the main body. FIG. 21 is a cross-sectional view showing a modified example in which a dust seal is provided on the main body side.
[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. To understand the illustrated embodiment, a swivel joint 20 for a fuel nozzle according to the prior art will first be described with reference to FIG.
[0016] In Fig. 1, this swivel joint 20 comprises a fuel filler nozzle-side bushing (hereinafter referred to as "bush") 1, a main body 2, and a fuel filler hose-side bushing (hereinafter referred to as "bush") 3. The main body 2 and bushings 1 and 3 are hollow, with bushing 1 fitting onto an inner peripheral surface 2C of a nozzle-side end 2A of the main body 2 and bushing 3 fitting onto an inner peripheral surface 2D of a hose-side end 2B of the main body 2. Bush 1 is connected to a fuel filler nozzle (not shown in Fig. 1), and bushing 3 is connected to a fuel filler hose (not shown) via a swivel elbow 20A.
[0017] The swivel joint 20 has a portion (nozzle-side rotating body accommodating portion 4) on the bushing 1 side in which a rotating body 7 such as a ball is accommodated, and a portion (hose-side rotating body accommodating portion 5) on the bushing 3 side in which the rotating body 7 is accommodated. Although not clearly shown in FIG. 1 , the main body 2 is provided with grease injection nipples for injecting grease (lubricating oil) into the rotating body accommodating portions 4 and 5. When assembling the swivel joint 20, the rotating body 7 is inserted into the rotating body accommodating portions 4 and 5 through holes that fasten the grease injection nipples.
[0018] 1, the bushings 1 and 3 have bushing protrusions T1 and T2 that protrude radially outward, and the bushing protrusions T1 and T2 are opposed to the ends 2A and 2B of the main body 2, respectively. In addition, a fuel oil seal member 6 (e.g., a U-packing) is provided at the boundary between the outer peripheral surfaces 1A and 3A of the bushings 1 and 3 and the inner peripheral surfaces 2C and 2D of the main body 2, near the boundary closer to the ends 1B and 3B of the bushings 1 and 3. The fuel oil seal member 6 is provided to prevent fuel oil flowing inside the swivel joint 20 from leaking to the outside.
[0019] Next, an embodiment of a swivel joint for a fuel filler nozzle according to the present invention will be described with reference to FIG.
[0020] Like the swivel joint 20 in Fig. 1 , this swivel joint 10 has components corresponding to the bushings 1 and 3, the main body 2, the fuel filler nozzle-side rotating body housing 4, the fuel filler hose-side rotating body housing 5, the fuel oil seal member 6, etc. Duplicate explanations of the same configuration as in Fig. 1 will be avoided. The swivel joint 10 has dust seals 8 and 9 on the outer peripheral surfaces 1A and 3A of the bushings 1 and 3, which seal the boundaries between the inner peripheral surfaces 2C and 2D of the main body 2 at the ends 2A and 2B (the ends of the main body refer to the areas outside the rotating body housings) and the bushing outer peripheral surfaces 1A and 3A. The dust seals 8 and 9 are positioned so that their lips face the bushing protrusions T1 and T2.
[0021] Dust seals 8, 9 are positioned closer to bushing protrusions T1, T2 than rotor housings 4, 5, preventing grease contained in rotor housings 4, 5 from leaking out of swivel joint 10 from the boundaries between inner circumferential surfaces 2C, 2D at ends 2A, 2B of main body 2 and outer circumferential surfaces 1A, 3A of the bushing. Furthermore, rainwater, salty water, disinfectant, etc. do not penetrate through the sealed areas from outside swivel joint 10, preventing rust from forming at the boundaries between inner circumferential surfaces 2C, 2D at ends 2A, 2B of main body 2 and outer circumferential surfaces 1A, 3A of the bushing, and preventing the grease from being decomposed by components contained in the disinfectant.
[0022] In Fig. 2, in order to arrange the dust seal 8 in the bushing 1, the length dimension LN from the fuel filler nozzle side rotating body accommodating portion 4 to the bushing protrusion T1 in the bushing 1 is longer than the corresponding length dimension in the prior art shown in Fig. 1. Similarly, the length dimension LH from the fuel filler hose side rotating body accommodating portion 5 to the bushing protrusion T2 is longer than the corresponding length dimension in the prior art shown in Fig. 1.
[0023] The dust seals 8 and 9 are preferably U-shaped packings, which are generally annular and have a U-shaped cross section. As described above, the open U-shaped sides of the dust seals 8 and 9 face the ends 2A and 2B of the main body 2. Therefore, the open U-shaped sides prevent disinfectants, rust inhibitors, rainwater, salty water, and other foreign matter from outside the swivel joint 10 from entering through the boundary between the main body 2 and the bushings 1 and 3. If grease contained in the rotor housings 4 and 5 attempts to leak out of the swivel joint 10 through the boundary between the main body 2 and the bushings 1 and 3, it is sealed by the closed U-shaped sides of the dust seals 8 and 9. Because there is no pressure difference between the rotor housings 4 and 5 and the outside of the swivel joint 10, the closed U-shaped sides of the U-shaped packings are sufficient to prevent grease from leaking out.
[0024] Here, instead of the U-packings, it is also possible to use X-packings as shown in Figure 3 for the dust seals 8 and 9. The X-packing 11 has a U-shaped opening on both sides, with two lips 11A on each side. In other words, the X-packing 11 has lips 11A in a total of four locations. Therefore, at the boundary between the main body 2 and the bushings 1 and 3, the four lips 11A can reliably seal against grease leakage from the inside (the fuel filler nozzle-side rotor housing 4 side) to the outside, and against the intrusion of disinfectants, rust inhibitors, rainwater, salty water, and other foreign matter from the outside (i.e., outside the swivel joint 20).
[0025] However, as shown in comparison with FIG. 3 , the dimension LX of the X packing 11 is larger than the dimension Lu of the U packings (dust seals) 8 and 9. Therefore, in FIG. 2 , the length LN from the nozzle-side rotator housing 4 to the nozzle-side end and the length LH from the hose-side rotator housing 5 to the bushing protrusion T2 are longer, resulting in a problem of increased weight of the cast body. Furthermore, because the number of lips 11A (four) of the X packing 11 is twice the number of lips 11A (two) of the U packings, the lips 11A abut against the body 2 or bushings 1 and 3 with a stronger force, resulting in increased rotational (sliding) resistance between the body 2 and bushing 1. Furthermore, the X packing 11 is more susceptible to deformation due to relative rotation between the body 2 and bushings 1 and 3 than the U packings 8 and 9. Therefore, the U packings 8 and 9 are more suitable as sealing members for use in the illustrated embodiment.
[0026] Here, the U-packing may have a lip not only on the open side (the right side in FIG. 4 ) but also on the opposite side (the so-called "closed U-side"). When assembling the modified U-packing 12 to the swivel joint 10 of the fuel filler nozzle, the open U-side of the modified U-packing 12 (the lip 12A side) is positioned so that it faces the fuel filler nozzle end 2A of the main body 2 or the bushing protrusion T1 of the bushing 1, i.e., facing outward. Furthermore, O-rings and X-rings can also be used as dust seals.
[0027] Next, the positions of the nozzle-side dust seal 8 and the hose-side dust seal 9 will be described with reference to Figures 5 to 10. Figures 5 to 10 describe the nozzle-side dust seal 8 arranged near the fuel filler nozzle end 2A of the main body 2, but the same applies to the hose-side dust seal 9 arranged near the fuel filler hose end 2B of the main body 2. In Figure 5, which shows the vicinity of the nozzle-side end 2A of the main body 2, a recess 1C into which a dust seal (U-packing) 8 is inserted is provided on the outer peripheral surface 1A of the bushing 1 at the boundary side with the main body 2, at a position roughly opposite the nozzle-side end 2A of the main body 2. Although not clearly shown in Figure 5, the recess 1C is formed around the entire circumference of the bushing 1 and accommodates the annular U-packing 8.
[0028] In FIG. 5 , the fuel filler nozzle-side end face 1BA of the recess 1C is located on the opposite side of the fuel filler nozzle (to the right in FIG. 5 ) from the body-side end face 1D of the protrusion T1, which is located radially outward (upward in FIG. 5 ). The fuel filler nozzle-side end face 1BA of the recess 1C, into which the dust seal 8 is inserted, is located very close to the fuel filler nozzle-side end face 2AA of the body 2, but is not located at a position corresponding to the end face 2AA of the body 2 (i.e., a position flush with the end face 2AA). The fuel filler nozzle-side end face 1BA of the recess 1C is located closer to the fuel filler nozzle-side rotator housing 4 (to the right in FIG. 5 ) than the end face 2AA of the body 2 by the dimension La. This allows the boundary between the inner circumferential surface 2C of the fuel filler nozzle-side end face 2A of the body 2 and the outer circumferential surface 1A of the fuel filler bushing 1 to be properly sealed without causing the inconveniences described below with reference to FIGS. 6 to 9 .
[0029] Referring to FIG. 6 , the reason why the dust seal 8 is located close to the fuel filler nozzle-side end face 2AA of the main body 2 will be explained. As described above, disinfectants, rust inhibitors, rainwater, salty water, and other foreign matter can infiltrate through the boundary between the fuel filler nozzle-side end face 2A of the main body 2 and the bushing 1, but are sealed off by the dust seal 8. As shown in FIG. 6 , if the dust seal 8 is located away from the end face 2AA of the main body end face 2A, disinfectants, rust inhibitors, rainwater, salty water, and other foreign matter can infiltrate the area from the end face 2AA at the boundary between the main body 2 and the bushing 1 to the fuel filler nozzle-side end face 1BA of the recess 1C in which the dust seal 8 is housed. In FIG. 6 , the path of infiltration of foreign matter is indicated by the dotted arrow A7. Rust will occur in the area where disinfectants, rust inhibitors, rainwater, salty water, and other foreign matter have infiltrated. In particular, rust in the area R7 surrounded by the dotted line will reduce the sliding performance of the swivel joint 20. In order to make the area R7 as small as possible, in the illustrated embodiment, a dust seal 8 is placed in close proximity to the fuel filler nozzle side end face 2AA of the main body 2, thereby preventing foreign matter from entering the area on the fuel filler nozzle side rotating body accommodating portion 4 side (right side in Figure 6) of the boundary between the main body 2 and the bush 1 as much as possible.
[0030] Furthermore, the provision of the dust seals 8, 9 increases the length dimensions LN and LH in FIG. 2 . The dimensions LN and LH become shorter as the dust seals 8, 9 are closer to the body ends 2A, 2B and longer as they are farther away. Long dimensions LN and LH increase the weight of the body 2, which is a casting, thereby degrading the operability of the fuel filler nozzle. Furthermore, long dimensions LN and LH increase the likelihood of interference (so-called "galling") during relative rotation between the body 2 and the bushings 1, 3, resulting in increased sliding resistance. For these reasons, in the illustrated embodiment, the dust seals 8, 9 are positioned close to the body ends 2A, 2B (see FIG. 2 ). That is, on the fuel filler nozzle side, if the dust seals 8, 9 are positioned very close to the fuel filler nozzle-side body end face 2AA and closer to the fuel filler nozzle-side rotor housing portion 4 than the end face 2AA of the body 2, the dimension LN will be increased by the minimum necessary length. Therefore, the weight of the bushing 1 and the main body 2 does not increase significantly, and the operability of the fuel filler nozzle swivel joint 10 is not reduced. In addition, interference (so-called "galling") between the rotating parts during relative rotation between the bushing 1 and the main body 2 is less likely to occur. Also, the area through which rainwater, salty water, or disinfectant solution can seep into the fuel filler nozzle-side rotating body housing 4 is reduced.
[0031] However, the U-packings that make up the dust seals 8 and 9 cannot be provided at positions corresponding to the end faces of the main body 2. The reason for this will be explained below with reference to FIGS. 7 to 10. While FIGS. 7 to 10 describe the dust seal 8 that is disposed near the fuel filler nozzle end 2A of the main body 2, the same applies to the dust seal 9 that is disposed near the fuel filler hose end 2B of the main body 2. In FIG. 7, the end face 1BA (the left end face in FIG. 7) of the recess 1C that houses the dust seal 8 is flush with the end face 1D of the bushing protrusion T1. The end face 1D of the bushing protrusion T1 abuts against the fuel filler nozzle end face 2AA of the main body 2. In the state shown in FIG. 7, the sealing performance of the dust seal 8 is not degraded.
[0032] When the end face 1BA of the recess 1C that accommodates the dust seal 8 and the end face 1D of the bushing protrusion T1 are configured to be flush with each other, part tolerances can cause a gap between the bushing step end face 1D and the main body end face 2AA in the assembled fuel filler nozzle swivel joint 10, as shown in FIG. 8 . When the lip 8A of the dust seal 8 abuts against the end face 1BA of the recess 1C (the left end face in FIG. 8 ), the tip of the lip 8A of the dust seal 8 (the hatched area) may enter the gap, as shown in FIG. 9 . In this case, the lip 8A that has entered the gap may be damaged by the relative rotation of the main body 2 and the bushing 1, potentially resulting in a loss of sealing performance of the dust seal 8. This could result in grease leaking from the fuel filler nozzle-side rotor housing 4, or in the intrusion of rainwater, salt-containing water, or disinfectants containing grease-degrading components into the boundary between the bushing 1 and the main body 2. Furthermore, if the tip of the lip 8A of the dust seal 8 gets into the gap, the dust seal 8 cannot move in the direction of the arrow α in FIG. 9 (towards the nozzle-side rotor housing portion 4, not shown).
[0033] In contrast to this, as shown in Figure 10, if the end face 1BA (the left end face in Figure 10) of the recess 1C that houses the dust seal 8 and the end face 1D of the bushing protrusion T1 are not flush, but the end face 1BA of the recess 1C that houses the dust seal 8 is formed so that it is on the inside (to the right in Figure 10) of the imaginary extension line L11 of the end face 1D of the bushing protrusion T1, as shown by the dimension δ, the tip of the lip 8A of the dust seal 8 (the hatched area in Figure 9) will not enter the gap or be damaged, and sealing performance will be exerted at the boundary between the inner circumferential surface 2C at the fuel filler nozzle side end 2A of the main body 2 and the outer circumferential surface 1A of the bushing 1. Furthermore, the dust seal can move in the direction of arrow α in Figure 10 (towards the nozzle-side rotator housing 4, not shown).
[0034] In other words, in Fig. 10 , as in Fig. 5 , the end face 1BA of the recess 1C that accommodates the dust seal 8 is not positioned in a position corresponding to the body end face 2AA and is not flush with the end face 1D of the bushing protrusion T1. Specifically, as shown in Fig. 10 , the end face 1BA (the left end face in Fig. 10 ) of the recess 1C that accommodates the dust seal 8 is positioned at least inward (to the right in Fig. 10 ) from the imaginary extension line L11 of the end face 1D of the bushing protrusion T1 by the radius of curvature r of the corner radius of the body end face 2AA. Here, "at least the radius of curvature r of the corner radius of the body end face 2AA" is an example of the "dimension δ" described above with reference to Fig. 10 . This eliminates the need for strict tolerances to prevent a gap from forming between the end face 1D of the bushing protrusion T1 and the body end face 2AA, as in Fig. 9 , thereby maintaining component manufacturing costs.
[0035] In FIGS. 2 to 10 , the dust seals 8 and 9 are provided on the outer peripheral surfaces 1A and 3A of the bushing. However, as shown in FIG. 11 , the dust seals 8 and 9 can be provided on the inner peripheral surface 2C of the main body 2 on the fuel filler nozzle side and the inner peripheral surface 2D of the main body 2 on the fuel filler hose side. In FIG. 11 , which shows a modified fuel filler nozzle swivel joint 10-1, the dust seals 8 and 9 that seal the boundaries between the inner peripheral surfaces 2C and 2D at the ends 2A and 2B of the main body 2 and the outer peripheral surfaces 1A and 3A of the bushing are provided on the inner peripheral surfaces 2C and 2D of the main body 2. In this case, to ensure sufficient thickness, overburden portions 2E and 2F are provided in the radially outward regions of the dust seals 8 and 9, and the thickness of the locations where the dust seals 8 and 9 are located is set large. The remaining configuration, operation, and effects of the modified example shown in FIG. 11 are similar to those of the embodiment shown in FIGS. 2 to 10 .
[0036] It should be noted that the illustrated embodiments are merely examples and are not intended to limit the technical scope of the present invention.
[0037] DESCRIPTION OF SYMBOLS 1...Fuel filler nozzle side bushing 1A...Outer peripheral surface of fuel filler nozzle side bushing 1B...End 1BA...Fuel filler nozzle side end face 1C...Recess 2...Main body 2A...Fuel filler nozzle side end 2AA...Fuel filler nozzle side end face 2B...Fuel filler hose side end 2C...Inner peripheral surface at fuel filler nozzle side end of main body 2D...Inner peripheral surface at fuel filler hose side end of main body 3...Fuel filler hose side bushing 3A...Outer peripheral surface of fuel filler hose side bushing 3B...End 4...Fuel filler nozzle side rotating body accommodating section 5...Fuel filler hose side rotating body accommodating section 6...Fuel oil sealing member 7...Rotating body 8...Nozzle side dust seal 8A...Lip 9...Hose side dust seal 10...Fuel filler nozzle swivel joint 11...X packing 11A...Lip 12...Deformed U packing 12A...Lip
Claims
1. A cylindrical body, A hollow fuel nozzle-side bush that fits onto the fuel nozzle-side end of the main body, A hollow fuel hose side bush that fits onto the fuel hose side end of the main body, A rotating body interposed between the fitting surface of the main body and the refueling nozzle-side bush, and between the fitting surface of the main body and the refueling hose-side bush, which allows relative rotation between the main body and the refueling nozzle-side bush and relative rotation between the main body and the refueling hose-side bush, It comprises a rotating body and a rotating body housing section that houses lubricating oil, A swivel joint for a fuel nozzle, characterized in that a dust seal is provided in the region of the fitting surface between the main body and the fuel nozzle-side bush, extending from the location where the rotating body housing is located toward the fuel nozzle-side end of the main body, on the side of the fuel nozzle-side rotating body housing that is closer to the fuel nozzle-side rotating body housing than the end face of the fuel nozzle-side end of the main body, and in the region of the fitting surface between the main body and the fuel hose-side bush, extending from the location where the rotating body housing is located toward the fuel hose-side end of the main body, on the side of the fuel hose-side rotating body housing that is closer to the end face of the fuel hose-side end of the main body.
2. The swivel joint for a fuel nozzle according to claim 1, characterized in that the dust seal disposed in the region of the fitting surface between the main body and the fuel nozzle-side bush, extending from the location where the rotating body housing is located toward the fuel nozzle-side end of the main body, and the dust seal disposed in the region of the fitting surface between the main body and the fuel hose-side bush, extending from the location where the rotating body housing is located toward the fuel hose-side end of the main body, are annular in shape and have a U-shaped cross-section.
3. (delete)