Rotary joint of oil supply nozzle

Abstract

Provided is a rotary joint of an oil supply nozzle capable of preventing leakage of lubricating oil from an end portion and infiltration of rainwater from the end portion. This rotary joint is provided with: a cylindrical body (2); a hollow filler nozzle-side bush (1) fitted to a filler nozzle-side end (2A) of the body (2); and a hollow filler hose-side bush (3) fitted to a filler hose-side end (2B) of the body (2). A rotating body (7) that permits relative rotation between the main body (2) and the oil supply nozzle-side bush (1) and relative rotation between the main body (2) and the oil supply hose-side bush (3); and rotating body accommodating sections (4, 5) that accommodate the rotating body and lubricating oil. A dust seal (9) is provided on the fitting surface of the main body (2) and the filler nozzle-side bush (1) in a region from the location of the rotating body housing section (4) toward the filler nozzle-side end (2A) of the main body (2), and on the fitting surface of the main body (2) and the filler hose-side bush (3) in a region from the location of the rotating body housing section (5) toward the filler hose-side end (2B) of the main body (2).

Description

Technical Field

[0001] This invention relates to a rotary joint used when connecting the oil supply nozzle of an oil supply device to the front end of an oil supply hose. Background Technology

[0002] The oil supply nozzle, connected to the front end of the oil supply hose via a rotary joint, is very useful because it improves operability and expands the oil supply range (see, for example, Patent Document 1). In such a rotary joint, lubricating oil such as grease is filled in the part where the rotating body (ball) is located to ensure smooth rotation.

[0003] Sometimes, lubricating oil may leak from the end of the rotary joint. Unlike fuel oil leaks, lubricating oil leaks do not cause serious incidents and do not adversely affect the safety of the lubrication operation. However, users of the lubrication system may sometimes mistake lubricating oil leaks for fuel oil leaks, leading to distrust of the system and prompting them to issue warnings.

[0004] Additionally, rainwater or salty water may seep into the rotary joint from its end via a path opposite to the lubricant leakage path, potentially causing the metal ball joint to rust. If the ball rusts, it will hinder the smooth rotation of the rotary joint and impede the operability of the lubrication nozzle. Furthermore, sometimes the disinfectant sprayed by lubrication system personnel into the lubrication nozzles as part of infection control measures contains components that break down lubricating grease. If such components seep into the rotary joint from its end, they will break down the lubricant and hinder the smooth rotation of the rotary joint.

[0005] In the oil supply nozzle (Patent Document 1) connected to the front end of the oil supply hose via a rotary joint, no attempt was made to eliminate problems caused by "lubricating oil leaking from the end of the rotary joint" or "rainwater, water containing salt, or disinfectant containing components that decompose grease seeping into the rotary joint from the end of the rotary joint".

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 60-183399 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The present invention was made in view of the problems of the prior art described above, and its object is to provide a rotary joint with an oil supply nozzle that can prevent "lubricating oil from leaking out from the end of the rotary joint" and "rainwater, water containing salt or disinfectant containing components that decompose grease from seeping into the end of the rotary joint".

[0011] Methods for solving problems

[0012] The rotary joint 10 of the oil supply nozzle of the present invention is characterized by comprising a cylindrical body 2, a hollow oil supply nozzle side bushing 1 that fits into the oil supply nozzle side end 2A of the body 2, a hollow oil supply hose side bushing 3 that fits into the oil supply hose side end 2B of the body 2, a rotating body 7 disposed between the mating surfaces of the body 2 and the oil supply nozzle side bushing 1 and the mating surfaces of the body 2 and the oil supply hose side bushing 3 and allowing relative rotation between the body 2 and the oil supply nozzle side bushing 1 and between the body 2 and the oil supply hose side bushing 3, and rotating body receiving portions 4 and 5 that contain the rotating body and lubricating oil. A dustproof seal 9 is provided in the region of the mating surface of the body 2 and the oil supply nozzle side bushing 1 from the location of the rotating body receiving portion 4 toward the oil supply nozzle side end 2A of the body 2, and in the region of the mating surface of the body 2 and the oil supply hose side bushing 3 from the location of the rotating body receiving portion 5 toward the oil supply hose side end 2B of the body 2.

[0013] In this invention, the dustproof seal 8 disposed on the mating surface of the main body 2 and the oil supply nozzle side bushing 1 and in the region from the location of the rotating body receiving part 4 toward the oil supply nozzle side end 2A of the main body 2, and the dustproof seal 9 disposed on the mating surface of the main body 2 and the oil supply hose side bushing 3 and in the region from the location of the rotating body receiving part 5 toward the oil supply hose side end 2B of the main body 2, are preferably packings that are generally annular and have a U-shaped cross-section.

[0014] Furthermore, preferably, the dustproof seal 8, which is disposed on the mating surface of the main body 2 and the oil supply nozzle side bushing 1 and in the region from the location of the rotating body receiving portion 4 toward the oil supply nozzle side end 2A of the main body 2, is disposed on the side closer to the oil supply nozzle side rotating body receiving portion 4 than the end face 2AA of the oil supply nozzle side end 2A of the main body 2; and the dustproof seal 9, which is disposed on the mating surface of the main body 2 and the oil supply hose side bushing 3 and in the region from the location of the rotating body receiving portion 5 toward the oil supply hose side end 2B of the main body 2, is disposed on the side closer to the oil supply hose side rotating body receiving portion 5 than the end face of the oil supply hose side end 2B of the main body 2.

[0015] Invention Effects

[0016] According to the rotary joint 10 of the present invention with the above-described configuration, dustproof seals 8 and 9 are provided in the area where the main body 2 and the oil supply nozzle side bushing 1 are fitted together and in the area from the location of the rotating body receiving portion 4 toward the oil supply nozzle side end 2A of the main body 2, and in the area where the main body 2 and the oil supply hose side bushing 3 are fitted together and in the area from the location of the rotating body receiving portion 5 toward the oil supply hose side end 2B of the main body 2. Therefore, the lubricating oil contained in the nozzle side rotating body receiving portion 4 and the oil supply hose side rotating body receiving portion 5 is sealed in each of the areas and is prevented from leaking to the outside of the rotary joint 10.

[0017] Furthermore, the dust seal 8 on the oil supply nozzle side and the dust seal 9 on the oil supply hose side prevent rainwater, water containing salt, disinfectant, etc., from seeping in from the outside into the area inside the seals 8 and 9 (the side of the rotating body receiving parts 4 and 5). Therefore, it prevents rusting at the boundary inside the seals 8 and 9 (the side of the rotating body receiving parts 4 and 5) and / or decomposition of the lubricating oil contained in the rotating body receiving parts 4 and 5 by the components of the disinfectant.

[0018] Furthermore, the dust seal 8 on the oil supply nozzle side is not located at a position corresponding to the end face 2AA of the main body 2, and the dust seal 9 on the oil supply hose side is not located at a position corresponding to the end face 2B of the oil supply hose side of the main body 2. Therefore, especially when the dust seals 8 and 9 are U-shaped gaskets, the lip of the U-shaped gasket can be prevented from intruding into the gap generated between the bushings 1 and 3 and the end face 2AA of the main body 2, and the sealing performance of the U-shaped gasket will not be lost. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view showing an example of a conventional rotary joint for an oil supply nozzle.

[0020] Figure 2 This is a cross-sectional view showing one embodiment of the rotary joint of the oil supply nozzle according to the present invention.

[0021] Figure 3 This diagram illustrates the inadequacy of the X-pad by comparing it to the U-pad.

[0022] Figure 4 Is with Figure 3 The diagram shows different types of U-shaped gaskets.

[0023] Figure 5 This is a partial cross-sectional view showing a U-shaped pad provided near the end of the main body.

[0024] Figure 6 This is a partial cross-sectional view showing the problem area when a U-shaped pad is provided at the end away from the main body.

[0025] Figure 7 This is a partial cross-sectional view showing the problem area when a U-shaped pad is provided at a position corresponding to the end face of the main body.

[0026] Figure 8 It is shown in Figure 7 The diagram shows a magnified partial cross-section of the gap between the end face of the main body and the end face of the bushing protrusion caused by tolerances in the shown state.

[0027] Figure 9 It is shown in Figure 8 The diagram shows a partial enlarged cross-section of the U-shaped liner, where the lip of the liner penetrates the gap between the end face of the main body and the end face of the bushing protrusion.

[0028] Figure 10 This is a partial enlarged cross-sectional view showing the interval between the extension lines of the end face of the groove that accommodates the U-shaped gasket and the end face of the main body.

[0029] Figure 11 This is a cross-sectional view of a modified example in which a dustproof seal is provided on the side of the main body. Detailed Implementation

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. To understand the illustrated embodiments, please first refer to... Figure 1 The rotary joint 20 of the oil supply nozzle involved in the prior art will be described.

[0031] exist Figure 1 The rotary joint 20 includes a nozzle-side bushing (hereinafter referred to as "bushel") 1, a main body 2, and a hose-side bushing (hereinafter referred to as "bushel") 3. The main body 2, bushings 1 and 3 are hollow in shape. Bushing 1 is fitted onto the inner circumferential surface 2C of the nozzle-side end 2A of the main body 2, and bushing 3 is fitted onto the inner circumferential surface 2D of the hose-side end 2B of the main body 2. Bushing 1 is connected to... Figure 1 The oil supply nozzle (not shown) is connected to the oil supply hose (not shown) via a swivel elbow 20A.

[0032] The rotary joint 20 is provided with a portion that houses a rotating body 7, such as a ball, on the bushing 1 side (nozzle-side rotating body housing portion 4) and a portion that houses a rotating body 7 on the bushing 3 side (hose-side rotating body housing portion 5). Although in Figure 1 Although not explicitly stated, the main body 2 is provided with grease injection pipe fittings for injecting grease (lubricating oil) into the rotating body receiving portions 4 and 5. Furthermore, when the rotary joint 20 is assembled, the rotating body 7 is inserted into the rotating body receiving portions 4 and 5 through the holes for fastening the grease injection pipe fittings.

[0033] exist Figure 1In the rotary joint 20, bushings 1 and 3 have bushing protrusions T1 and T2 that protrude outward in a radial direction, and the ends 2A and 2B of the main body 2 face the bushing protrusions T1 and T2, respectively. Furthermore, a fuel oil sealing member 6 (e.g., a U-shaped gasket) is provided near the boundary of the bushings 1 and 3, close to the ends 1B and 3B, and 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. The fuel oil sealing member 6 is provided to prevent fuel oil flowing within the rotary joint 20 from leaking to the outside.

[0034] Next, refer to Figure 2 An embodiment of the rotary joint of the oil supply nozzle according to the present invention will be described.

[0035] The rotary joint 10 and Figure 1 Similarly, the rotary joint 20 has components equivalent to those of the bushings 1 and 3, the main body 2, the fuel nozzle-side rotating body receiving part 4, the fuel hose-side rotating body receiving part 5, and the fuel oil sealing member 6. Regarding the... Figure 1 The same configuration will be described again to avoid repetition. In the rotary joint 10, dustproof seals 8 and 9, which seal the boundary between the inner circumferential surfaces 2C and 2D of the ends 2A and 2B of the main body 2 (the ends of the main body refer to the areas further outward than the rotating body receiving portion) and the outer circumferential surfaces 1A and 3A of the bushing, are provided on the outer circumferential surfaces 1A and 3A of the bushings 1 and 3. The dustproof seals 8 and 9 are arranged such that their lips face the bushing protrusions T1 and T2.

[0036] Dustproof seals 8 and 9 are positioned closer to bushing protrusions T1 and T2 than the rotating body receiving portions 4 and 5. Therefore, they prevent the grease contained in the rotating body receiving portions 4 and 5 from leaking out of the rotary joint 10 from the boundary between the inner circumferential surfaces 2C and 2D at the ends 2A and 2B of the main body 2 and the outer circumferential surfaces 1A and 3A of the bushing. Furthermore, rainwater, salt-containing water, disinfectant, etc., from outside the rotary joint 10 will not seep in through this seal, preventing "rust at the boundary between the inner circumferential surfaces 2C and 2D at the ends 2A and 2B of the main body 2 and the outer circumferential surfaces 1A and 3A of the bushing" and "decomposition of the grease by components contained in the disinfectant."

[0037] exist Figure 2 In this configuration, the dustproof seal 8 is placed in the bushing 1. Therefore, in the bushing 1, the length LN from the oil supply nozzle side rotating body receiving portion 4 to the bushing protrusion T1 is greater than that of the other bushing. Figure 1 The corresponding length dimension shown in the prior art is longer. Similarly, the length dimension LH from the oil supply hose side rotating body receiving part 5 to the bushing protrusion T2 is longer than that of the prior art. Figure 1 The corresponding length dimension shown in the prior art is longer.

[0038] The dustproof seals 8 and 9 are preferably U-shaped gaskets, which are circular in shape with a U-shaped cross-section. As mentioned earlier, the open side of the U-shape in the dustproof seals 8 and 9 faces the ends 2A and 2B of the main body 2. Therefore, disinfectants, rust inhibitors, rainwater, water containing salt, and other foreign matter from outside the rotary joint 10 are prevented from seeping in through the boundary between the main body 2 and the bushings 1 and 3 through the open side of the U-shape. If the grease contained in the rotating body receiving parts 4 and 5 is to leak out of the rotary joint 10 through the boundary between the main body 2 and the bushings 1 and 3, it is sealed on the closed side of the U-shape in the dustproof seals 8 and 9. There is no pressure difference between the rotating body receiving parts 4 and 5 and the outside of the rotary joint 10, so as long as the grease is prevented from seeping out, the closed side of the U-shape of the U-shaped gasket can be fully sealed.

[0039] Here, as dustproof seals 8 and 9, it is also possible to consider using them instead of the U-shaped gasket. Figure 3 The X-shield is shown. The X-shield 11 has an open U-shaped design on both sides, with two lips 11A on each side. That is, the X-shield 11 has lips 11A at a total of four locations. Therefore, the boundaries between the main body 2 and the bushings 1 and 3 can be reliably sealed by the four lips 11A to prevent leakage of lubricating grease from the inside (oil nozzle side, rotating body receiving part 4 side) to the outside, and to prevent the intrusion of disinfectant, rust inhibitor, rainwater, water containing salt, and other foreign matter from the outside (i.e., the outside of the rotary joint 20).

[0040] However, as with Figure 3 As the comparison shows, the dimension of X gasket 11, indicated by the reference numeral LX, is larger than the dimension of U gaskets (dust seals) 8 and 9, indicated by the reference numeral Lu. Therefore, the following problem exists: Figure 2 In this design, the length LN from the nozzle-side rotating body receiving portion 4 to the nozzle-side end and the length LH from the hose-side rotating body receiving portion 5 to the bushing protrusion T2 are both lengthened, increasing the weight of the cast body. Furthermore, the number of lips 11A (4) on the X-shield 11 is twice the number of lips 11A (2) on the U-shields, resulting in a stronger force between the lips 11A and the body 2 or bushings 1 and 3. Consequently, the rotational (sliding) resistance between the body 2 and the bushing 1 increases. Moreover, compared to the U-shields 8 and 9, the X-shield 11 is more prone to deformation due to the relative rotation between the body 2 and the bushings 1 and 3. Therefore, the U-shields 8 and 9 are more suitable as sealing members in the illustrated embodiment.

[0041] Here, as a U-shaped pad, it can be used not only on the open side ( Figure 4The type has a lip on the right side (the middle side) and also a lip on the opposite side (the so-called "closed side of the U"). When the deformed U-shaped gasket 12 is assembled to the rotary joint 10 of the oil supply nozzle, the open side of the U-shape of the deformed U-shaped gasket 12 (the side of the lip 12A) is also arranged outwards towards the oil supply nozzle side end 2A side of the body 2 or the bushing protrusion T1 side of the bushing 1. Furthermore, O-rings or X-rings can also be used as dustproof seals.

[0042] Next, refer to Figures 5-10 The placement of the nozzle-side dust seal 8 and the hose-side dust seal 9 is explained. Figures 5-10 In this description, the nozzle-side dust seal 8, located near the oil supply nozzle-side end 2A of the main body 2, is explained. However, the same applies to the hose-side dust seal 9, located near the oil supply hose-side end 2B of the main body 2. The description also includes the area near the nozzle-side end 2A of the main body 2. Figure 5 In the middle, on the outer peripheral surface 1A of the bushing 1 at the boundary side with the main body 2 and at a position approximately opposite to the nozzle-side end 2A of the main body 2, a recess 1C is provided for inserting a dustproof seal (U-shaped gasket) 8. Although in Figure 5 It is not explicitly stated, but the recess 1C is formed around the entire circumference of the bushing 1, accommodating the annular U-shaped gasket 8.

[0043] exist Figure 5 In the middle, the oil supply nozzle side end face 1BA at the recess 1C is located relative to the outer side in its radial direction (in Figure 5 The main body side end face 1D of the protrusion T1 at the position of the upper part (in the middle) is located on the side opposite to the oil supply nozzle side with dimension La. Figure 5 (The middle is the right side). The oil supply nozzle side end face 1BA at the recess 1C into which the dustproof seal 8 is inserted is located very close to the oil supply nozzle side end face 2AA of the main body 2, but is not located at a position corresponding to the end face 2AA of the main body 2 (it is coplanar with the end face 2AA). The oil supply nozzle side end face 1BA at the recess 1C is located closer to the oil supply nozzle side rotating body receiving part 4 than the end face 2AA of the main body 2. Figure 5 The right side of (the area to the right) indicates the position of dimension La. Therefore, no reference is generated. Figures 6-9 The discomfort described later is that the boundary between the inner circumferential surface 2C of the oil supply nozzle side end 2A of the main body 2 and the outer circumferential surface 1A of the oil supply bushing 1 is properly sealed.

[0044] Reference Figure 6 The reason for positioning the dust seal 8 near the oil supply nozzle side end face 2AA of the main body 2 will be explained. As described above, disinfectants, rust inhibitors, rainwater, water containing salt, and other foreign matter may seep in through the boundary between the oil supply nozzle side end face 2A of the main body 2 and the bushing 1, but are sealed by the dust seal 8. Figure 6As shown, when the dust seal 8 is located at the end face 2AA away from the end of the main body 2A, disinfectant, rust inhibitor, rainwater, water containing salt, and other foreign matter are immersed in the area from the end face 2AA at the boundary between the main body 2 and the bushing 1 to the oil supply nozzle side end face 1BA of the recess 1C that accommodates the dust seal 8. Figure 6 In the diagram, the path of foreign object intrusion is indicated by the dashed arrow A7. Furthermore, rust will form in areas infiltrated by disinfectants, rust inhibitors, rainwater, water containing salt, and other foreign objects. In particular, if rust forms in the area R7 enclosed by the dashed line, the sliding properties of the rotary joint 20 will decrease. To minimize this area R7, in the illustrated embodiment, a dust seal 8 is positioned near the oil supply nozzle side end face 2AA of the main body 2, thus preventing foreign objects from penetrating into the oil supply nozzle side rotating body receiving portion 4 at the boundary between the main body 2 and the bushing 1. Figure 6 The area to the right of (the right side).

[0045] In addition, by setting dustproof seals 8 and 9, Figure 2 The length dimensions LN and LH of the dust seals become longer. The closer the dust seals 8 and 9 are to the ends 2A and 2B of the main body, the shorter the dimensions LN and LH are; the farther the dust seals 8 and 9 are from the ends 2A and 2B of the main body, the longer the dimensions LN and LH are. If the dimensions LN and LH are long, the weight of the main body 2, which is a casting, increases accordingly, and the operability of the oil supply nozzle deteriorates. Furthermore, if the dimensions LN and LH are long, interference (so-called "easy seizing") is more likely to occur when the main body 2 rotates relative to the bushings 1 and 3, and the sliding resistance increases. For the above reasons, in the illustrated embodiment, the dust seals 8 and 9 are positioned close to the ends 2A and 2B of the main body (see reference). Figure 2 The configuration is such that if the nozzle is positioned very close to the end face 2AA of the main body on the nozzle side and closer to the nozzle-side rotating body receiving portion 4 than the end face 2AA of the main body 2, then even with the dustproof seal 8, the dimension LN is only the minimum length necessary for the increased length. Therefore, the weight of the bushing 1 and the main body 2 will not increase significantly, and the operability of the rotary joint 10 of the nozzle will not decrease. In addition, interference (so-called "engagement") between the rotating components is less likely to occur when the bushing 1 and the main body 2 rotate relative to each other. Furthermore, the area in which rainwater, water containing salt, or disinfectant may seep into the nozzle-side rotating body receiving portion 4 is reduced.

[0046] However, the U-shaped gaskets constituting the dustproof seals 8 and 9 cannot be positioned at a location corresponding to the end face of the main body 2. See below for reference. Figures 7-10 Explain your reasoning. Furthermore, in Figures 7-10 The description focuses on the dust seal 8 located near the oil supply nozzle end 2A of the main body 2, but the same applies to the dust seal 9 located near the oil supply hose end 2B of the main body 2. Figure 7 In the middle, the end face 1BA of the recess 1C of the dustproof seal 8 (in Figure 7 The left end face of the bushing protrusion T1 is coplanar with the end face 1D of the bushing protrusion T1. Furthermore, the end face 1D of the bushing protrusion T1 abuts against the oil supply nozzle side end face 2AA of the main body 2. If it is... Figure 7 If the condition shown indicates that the sealing performance of the dustproof seal 8 will not deteriorate.

[0047] Here, when the end face 1BA of the recess 1C constituting the dust seal 8 and the end face 1D of the bushing protrusion T1 are coplanar, due to component tolerances, the following situation exists: in the assembled rotary joint 10 of the oil supply nozzle, such as Figure 8 As shown, there is a gap between the end face 1D of the bushing protrusion and the end face 2AA of the main body. Furthermore, when the lip 8A of the dust seal 8 is close to the end face 1BA of the recess 1C (… Figure 8 When the left end face (center) comes into contact, as Figure 9 As shown, the tip of the lip 8A of the dust seal 8 (the area marked with a shaded line) may enter the gap. In this case, the intruded lip 8A may break due to the mutual rotation of the main body 2 and the bushing 1, and the sealing performance of the dust seal 8 may be lost. Therefore, grease from the oil nozzle-side rotating body receiving part 4 may leak out, or rainwater, water containing salt, or disinfectant containing components that decompose grease may seep 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 enters the gap, the dust seal 8 will be unable to supply oil to the target area. Figure 9 It moves in the direction of arrow α (to the nozzle side of the rotating body housing 4, not shown).

[0048] In contrast, such as Figure 10 As shown, if the end face 1BA of the recess 1C that accommodates the dust seal 8 ( Figure 10 The left end face (in the middle) is not coplanar with the end face 1D of the bushing protrusion T1, and the end face 1BA of the recess 1C that accommodates the dust seal 8 is formed as an imaginary extension line L11 relative to the end face 1D of the bushing protrusion T1, located on the inner side as shown by dimension δ. Figure 10 (The middle is the right side), then the front end of the lip 8A of the dustproof seal 8 ( Figure 9 The area marked with a shaded line will not enter the gap or break, thus ensuring a seal between the inner circumferential surface 2C at the oil supply nozzle side end 2A of the main body 2 and the outer circumferential surface 1A of the bushing 1. Additionally, the dust seal can... Figure 10 It moves in the direction of arrow α (to the nozzle side of the rotating body housing 4, not shown).

[0049] In other words, in Figure 10 In, with Figure 5Similarly, the end face 1BA of the recess 1C that houses the dust seal 8 is not positioned corresponding to the end face 2AA of the main body, and is not coplanar with the end face 1D of the bushing protrusion T1. Specifically, as Figure 10 As shown, the end face 1BA of the recess 1C that houses the dustproof seal 8 ( Figure 10 The left end face is configured such that the imaginary extension line L11 of the end face 1D of the bushing protrusion T1 is located inside the body end face 2AA with a radius of curvature r of at least the fillet radius at the end face 2AA. Figure 10 (The middle is the right side). Here, "the radius of curvature r of the fillet at least at the end face 2AA of the main body" is a reference. Figure 10 An example of the "size δ" described above. Therefore, it is unnecessary to assume that it will not be as... Figure 9 The method of forming the gap between the end face 1D of the bushing protrusion T1 and the end face 2AA of the main body is used to strictly control the tolerance, which can maintain the cost of component manufacturing.

[0050] exist Figures 2-10 In the middle, dustproof seals 8 and 9 are provided on the outer peripheral surfaces 1A and 3A of the bushing. However, if Figure 11 As shown, dust seals 8 and 9 can be disposed on the inner circumferential surface 2C of the main body 2 on the oil supply nozzle side and the inner circumferential surface 2D of the main body 2 on the oil supply hose side. The rotary joint 10-1 of the oil supply nozzle shown in the modified example... Figure 11 In this configuration, dustproof seals 8 and 9, which seal the boundary between the inner circumferential surfaces 2C and 2D of the ends 2A and 2B of the main body 2 and the outer circumferential surfaces 1A and 3A of the bushing, are provided on the inner circumferential surfaces 2C and 2D of the main body 2. In this case, in order to ensure wall thickness, raised portions 2E and 2F are provided in the region outside the radius of the area where the dustproof seals 8 and 9 are provided, and the thickness dimension of the area where the dustproof seals 8 and 9 are provided is set to be large. Figure 11 Other components, functions, and effects of the variations are as follows. Figures 2-10 The implementation method is the same.

[0051] Note: The illustrated embodiments are always illustrative and are not intended to limit the scope of the invention.

[0052] Explanation of reference numerals in the attached figures

[0053] 1. Fuel supply nozzle side bushing

[0054] 1A···Outer circumferential surface of the fuel supply nozzle side bushing 1B···End

[0055] 1BA··· Fuel Injector Side Face

[0056] 1C···Concave part

[0057] 2. Main Body

[0058] 2A··· Fuel supply nozzle side end

[0059] 2AA··· Fuel supply nozzle side end face

[0060] 2B··· Oil supply hose end

[0061] 2C···Inner circumferential surface at the end of the fuel supply nozzle side of the main body

[0062] 2D...Inner circumferential surface at the end of the oil supply hose of the main body

[0063] 3. Oil supply hose side bushing

[0064] 3A···Outer circumferential surface of the oil supply hose side bushing

[0065] 3B···End

[0066] 4. Oil supply nozzle side rotating body housing section

[0067] 5. Oil supply hose side rotating body housing section

[0068] 6. Fuel oil sealing components

[0069] 7··· Rotational Solids

[0070] 8. Dustproof seal on the nozzle side

[0071] 8A···Lips

[0072] 9. Dustproof seal on the side of the hose

[0073] 10. Rotary joint of fuel supply nozzle

[0074] 11···X Pad

[0075] 11A···Lips

[0076] 12···Deformed U-shaped gasket

[0077] 12A···Lips

Claims

1. A swivel joint for a fuel supply nozzle, characterized in that have: cylindrical body; The hollow oil supply nozzle side bushing fits into the oil supply nozzle side end of the main body; The hollow oil supply hose side bushing is fitted into the oil supply hose side end of the main body; A rotating body, located between the mating surfaces of the main body and the oil supply nozzle side bushing and the mating surfaces of the main body and the oil supply hose side bushing, allows relative rotation between the main body and the oil supply nozzle side bushing and relative rotation between the main body and the oil supply hose side bushing. as well as The rotating body housing section houses the rotating body and lubricating oil. A dustproof seal is provided on the mating surface of the main body and the oil supply nozzle side bushing, in the region from the location of the rotating body receiving portion toward the oil supply nozzle side end of the main body, and on the mating surface of the main body and the oil supply hose side bushing, in the region from the location of the rotating body receiving portion toward the oil supply hose side end of the main body.

2. The rotary joint of the oil supply nozzle according to claim 1, characterized in that, The dustproof seal disposed on the mating surface of the main body and the oil supply nozzle side bushing and in the area from the location of the rotating body receiving part toward the oil supply nozzle side end of the main body, and the dustproof seal disposed on the mating surface of the main body and the oil supply hose side bushing and in the area from the location of the rotating body receiving part toward the oil supply hose side end of the main body, are gaskets that are generally annular and have a U-shaped cross-section.

3. The rotary joint of the oil supply nozzle according to claim 1 or 2, characterized in that, A dustproof seal is disposed on the mating surface of the main body and the oil supply nozzle side bushing, and in the region from the location of the rotating body receiving portion toward the oil supply nozzle side end of the main body. This dustproof seal is positioned closer to the oil supply nozzle side rotating body receiving portion than the end face of the oil supply nozzle side end of the main body. A dustproof seal is disposed on the mating surface of the main body and the oil supply hose side bushing, and in the area from the location of the rotating body receiving portion toward the oil supply hose side end of the main body, and is disposed on the side of the oil supply hose side rotating body receiving portion closer to the end face of the oil supply hose side end of the main body.

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