Universal Pipe Joint

Abstract

To provide a universal pipe joint which is excellent in construction performance.SOLUTION: A universal pipe joint 1 comprises a first constituent member 11 and a second constituent member 21 which are connected to each other so as to be relatively turnable. The first constituent member 11 has a first retention mechanism for retaining a first pipe 101 in a relatively-turnable state. The second constituent member 21 has a second retention mechanism for retaining a second pipe 102 in a relatively-turnable state. The universal pipe joint 1 is deformable between a form of an elbow-type pipe joint and a form of a straight-type pipe joint. The first constituent member 11 comprises a cylindrical first connecting part 13 connected to the second constituent member 21. The second constituent member 21 comprises a second connecting part 23 which is inserted into and connected to the first connecting part 13 of the first constituent member 11, and in which a flow passage 23a is formed. A positioning face 13b on which a tip face of the second connecting part 23 abuts is formed at an internal peripheral face of the first connecting part 13 over an entire periphery.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a universal pipe joint that can be transformed between the form of an elbow-type pipe joint and the form of a straight-type pipe joint. [Background technology]

[0002] This type of universal pipe joint is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-145493 Summary of the Invention [Problem to be solved by the invention]

[0004] In the universal pipe joint of Patent Document 1, when the posture of one pipe body is fixed in the form of an elbow pipe joint, the orientation of the other pipe body is limited. Therefore, when connecting a pipe to one pipe body, unless consideration is given to the relative positional relationship around the central axis of the pipe body and the pipe, which coincide with each other, there is a problem that it becomes difficult to connect the pipe to the other pipe body thereafter.

[0005] For example, in Figure 1 of Patent Document 1, when one pipe body 1 is fixed in the position shown in the figure, the orientation of the other pipe body 2 is limited to the downward direction in the figure. Therefore, it is difficult to connect a pipe that is intended to extend from the universal pipe joint upward in the figure to the outer end 4 of the other pipe body 2, making installation difficult.

[0006] An object of the present invention is to provide a universal pipe joint that is easy to install. [Means for solving the problem]

[0007] In order to solve the above problem, the universal pipe fitting of claim 1 has a first component having a first anti-slip mechanism that prevents the first pipe from coming off while allowing relative rotation, and a second component having a second anti-slip mechanism that prevents the second pipe from coming off while allowing relative rotation, which are connected to each other so that they can rotate relative to each other, and can be transformed between the form of an elbow-type pipe fitting and the form of a straight-type pipe fitting, the first component having a cylindrical first connecting portion that is connected to the second component, and the second component having a second connecting portion that is inserted into and connected to the first connecting portion of the first component and has a flow path formed therein, and a positioning surface that abuts against the tip surface of the second connecting portion is formed around the entire inner surface of the first connecting portion. [Effects of the Invention]

[0008] According to the present invention, the universal pipe coupling has a first component member and a second component member that are rotatable relative to one another, and can be transformed between an elbow-type pipe coupling and a straight-type pipe coupling. Furthermore, the universal pipe coupling is rotatable relative to the first pipe while the first pipe remains in a locked state, and is rotatable relative to the second pipe while the second pipe remains in a locked state.

[0009] Therefore, even when the universal pipe fitting is connected to a first pipe that is fixed non-rotatably to a construction surface, for example, it can rotate relative to the first pipe, and even when in the form of an elbow-type pipe fitting (when the second pipe is not connected), the orientation of the second component member is not limited, making it easy to install. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a front view of a universal pipe joint in the form of an elbow-type pipe joint. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 2 is a front view of a universal pipe joint in the form of a straight-type pipe joint. [Figure 9] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which a universal pipe joint used in a cold water / hot water supply pipe is embodied.

[0012] As shown in Figures 1 and 8, the universal pipe joint 1 has a configuration that allows it to be transformed between an elbow pipe joint state (the state shown in Figure 1) and a straight pipe joint state (the state shown in Figure 8).

[0013] As shown in Figures 1 to 6, a universal pipe fitting 1 in the form of an elbow pipe fitting is used to connect a first pipe 101 and a second pipe 102 in a positional relationship in which the central axes L1, L2 are perpendicular to each other. As shown in Figure 8, a universal pipe fitting 1 in the form of a straight pipe fitting is used to connect a first pipe 101 and a second pipe 102 in a positional relationship in which the central axes L1, L2 are aligned with each other. The first pipe 101 and the second pipe 102 are made of a synthetic resin material such as cross-linked polyethylene or polybutene.

[0014] 7 and 9, the universal pipe joint 1 comprises a first component member 11 and a second component member 21. The first component member 11 and the second component member 21 are connected to be able to rotate relative to each other so that the universal pipe joint 1 can be transformed between the form of an elbow pipe joint and the form of a straight pipe joint.

[0015] The first component 11 includes a first joint portion 12 to which the first pipe 101 is connected, a first connecting portion 13 connected to the second component 21, and a first bent portion 14 connecting the first joint portion 12 and the first connecting portion 13. The second component 21 includes a second joint portion 22 to which the second pipe 102 is connected, a second connecting portion 23 connected to the first connecting portion 13 of the first component 11, and a second bent portion 24 connecting the second joint portion 22 and the second connecting portion 23.

[0016] Since the first joint portion 12 of the first component member 11 and the second joint portion 22 of the second component member 21 have the same structure, only the structure of the first joint portion 12 will be explained, and the second joint portion 22 will be assigned the same component number and will not be explained again.

[0017] As shown in Figure 7, the first joint part 12 includes a cylindrical joint body 31 and a cylindrical press ring 32. An internal thread 31a is formed on the inner peripheral surface of the joint body 31 in a region facing the press ring 32. An external thread 32a is formed on the outer peripheral surface of the press ring 32 in a region facing the joint body 31. The press ring 32 is attached to the joint body 31 by threading the external thread 32a into the internal thread 13a of the joint body 31. With the press ring 32 attached, the internal space of the joint body 31 is open to the outside via an insertion hole 32b formed in the center of the press ring 32.

[0018] A wrench hook 32c, whose outer diameter is larger than that of the male thread 32a, is formed on the outer peripheral surface of the press ring 32 in an area opposite the male thread 32a (to the left in the drawing). A housing groove 32d is formed along the circumferential direction on the outer peripheral surface of the press ring 32 between the male thread 32a and the wrench hook 32c. An O-ring 41 is housed in the housing groove 32d. The O-ring 41 seals the gap between the joint body 31 and the press ring 32, outside the portion where the male thread 32a and the female thread 31a are threaded together.

[0019] A locking step 31b is formed circumferentially on the inner peripheral surface of the joint body 31, further back (to the right in the drawing) than the female thread 31a. The locking step 31b faces the front and rear of the tip surface (the end surface on the right in the drawing) of the pressure ring 32 in the direction of the central axis L1 (left and right in the drawing). A pair of lock rings 42 serving as retaining members are locked between the locking step 31b and the tip surface of the pressure ring 32, with an annular spacer 43 interposed between them.

[0020] Each lock ring 42 comprises a base ring 42a having a circular shape and made of a metal material such as stainless steel, and a plurality of regulating pieces 42b that protrude from the base ring 42a toward the rear side of the joint body 31 at a constant angle and of the same length.

[0021] The end of the first pipe 101 is inserted into the joint body 31 via the insertion hole 32b of the press ring 32, and is passed through a pair of lock rings 42. When a pulling force is applied to the first pipe 101 that is passed through the pair of lock rings 42, the tips of the restricting pieces 42b of the pair of lock rings 42 each bite into the outer peripheral surface of the first pipe 101, preventing the first pipe 101 from coming off.

[0022] That is, the first joint part 12 is provided with a first retaining mechanism consisting of a one-touch joint that allows the first pipe 101 to be connected simply by inserting the first pipe 101 into the first joint part 12. The second joint part 22 of the second component part 21 can be understood to be provided with a second retaining mechanism.

[0023] Within the first joint part 12, an appropriate gap is secured between the pair of lock rings 42 and the spacer 43 in the front and rear in the direction of the central axis L1 between the locking step 31b of the joint body 31 and the tip surface of the press ring 32. Therefore, the pair of lock rings 42 can rotate together with the first pipe 101 relative to the joint body 31 and the press ring 32 while retaining the first pipe 101 in place.

[0024] An inner core 51 is attached to the end of the first pipe 101. The inner core 51 has a cylindrical portion 51a that is inserted into the end of the first pipe 101, and a flange portion 51b that is formed on the end of the cylindrical portion 51a opposite the side that is inserted into the first pipe 101. The cylindrical portion 51a of the inner core 51 is inserted into the first pipe 101 up to a position where the flange portion 51b abuts against the end face of the first pipe 101.

[0025] A positioning surface 31c is formed in the circumferential direction at the innermost portion of the inner peripheral surface of the joint body 31. The insertion position of the first pipe 101 inserted into the first joint part 12 is determined by the flange part 51b of the inner core 51 abutting against the positioning surface 31c.

[0026] A pair of accommodation grooves 31d are formed along the circumferential direction in the region between the locking step 31b and the positioning surface 31c on the inner circumferential surface of the joint body 31. An O-ring 44 is accommodated in each accommodation groove 31d. The O-rings 44 seal between the inner circumferential surface of the joint body 31 and the outer circumferential surface of the first pipe 101 inserted into the joint body 31.

[0027] The first connecting portion 13 of the first component member 11 is cylindrical. The central axis L3 of the first connecting portion 13 intersects with the central axis L1 of the first pipe 101, i.e., the central axis L1 of the first joint portion 12, at an angle (smaller angle) θ1 of 45 degrees. An engagement groove 13a is formed along the circumferential direction on the inner circumferential surface of the first connecting portion 13 opposite the first bent portion 14. A positioning surface 13b is formed along the circumferential direction on the inner circumferential surface of the first connecting portion 13 at the innermost part on the first bent portion 14 side.

[0028] The first bent portion 14 of the first component member 11 has a cylindrical shape with the center line of the flow path 14a curved in an S-shape. The flow path 14a includes a first curved section 14a-1 connected to the first joint portion 12 (the inner core 51 of the first pipe 101), a second curved section 14a-2 connected to the first connecting portion 13, and a straight section 14a-3 connecting the first curved section 14a-1 and the second curved section 14a-2.

[0029] The first curved section 14a-1, the second curved section 14a-2, and the straight section 14a-3 have substantially the same inner diameter (cross-sectional area), and this inner diameter is substantially the same as the inner diameter of the incore 51 attached to the first pipe 101. The opening of the first curved section 14a-1 facing the first joint portion 12 (first pipe 101) is tapered so that the inner diameter gradually increases toward the incore 51 attached to the first pipe 101, thereby reducing flow path resistance.

[0030] The central axis L4 of the straight section 14a-3 intersects with the central axis L3 of the first connecting portion 13 at an angle θ2 of 90 degrees. The first curved section 14a-1 smoothly connects the first joint portion 12 (the in-core 51 of the first pipe 101) and the straight section 14a-3. The second curved section 14a-2 smoothly connects the first connecting portion 13 and the straight section 14a-3. The opening of the second curved section 14a-2 facing the internal space of the first connecting portion 13 is tapered so that the inner diameter gradually increases toward the internal space, thereby reducing flow path resistance.

[0031] The second connecting portion 23 of the second component 21 is cylindrical. A linear flow path 23a is formed within the second connecting portion 23. The opening of the flow path 23a at the tip end face (the end face on the left side in the drawing) of the second connecting portion 23 is tapered so that the inner diameter gradually increases toward the tip end face, thereby reducing flow path resistance. The central axis L5 of the second connecting portion 23 (flow path 23a) intersects with the central axis L2 of the second pipe 102, i.e., the central axis L2 of the second joint portion 22, at an angle (smaller angle) θ3 of 45 degrees.

[0032] The outer diameter of the second connecting portion 23 is slightly smaller than the inner diameter of the first connecting portion 13 of the first component member 11, and the second connecting portion 23 is inserted into the first connecting portion 13. In this inserted state, the central axis L3 of the first connecting portion 13 and the central axis L5 of the second connecting portion 23 are aligned. The inner circumferential surface of the first connecting portion 13 of the first component member 11, in a region closer to the tip end (to the right in the drawing) than the engagement groove 13a, is tapered such that the inner diameter increases toward the opening, facilitating insertion of the second connecting portion 23 into the first connecting portion 13. To ensure good shape alignment with the tapered shape of the first connecting portion 13, the outer circumferential surface of the second connecting portion 23, in a region closer to the base end (to the right in the drawing), is tapered such that the outer diameter increases toward the base end.

[0033] A flange 23d is provided on the outer peripheral surface of the base end of the second connecting portion 23. The tip surface of the second connecting portion 23 abuts against the positioning surface 13b of the first connecting portion 13, and the tip surface of the first connecting portion 13 abuts against the flange 23d of the second connecting portion 23, thereby determining the insertion position of the second connecting portion 23 relative to the first connecting portion 13.

[0034] A pair of housing grooves 23b are formed along the circumferential direction in a region on the tip side of the outer peripheral surface of the second connecting portion 23. Each housing groove 23b houses an O-ring 45. The gap between the inner peripheral surface of the first connecting portion 13 and the outer peripheral surface of the second connecting portion 23 is sealed by each O-ring 45.

[0035] An engagement groove 23c is formed along the circumferential direction in a region on the second bent portion 24 side of the outer peripheral surface of the second connecting portion 23. The engagement groove 23c is arranged facing the engagement groove 13a of the first connecting portion 13 of the first component 11. A retaining ring 46 is housed in the space formed between the engagement groove 13a and the engagement groove 23c. By interposing the retaining ring 46 between the engagement groove 13a and the engagement groove 23c, the first connecting portion 13 and the second connecting portion 23 are prevented from coming off from each other in the directions of the central axes L3 and L5, and the first component 11 and the second component 21 are connected to each other so as to be able to rotate relative to each other about the central axes L3 and L5.

[0036] The second bent portion 24 of the second component member 21 has a cylindrical shape with the center line of the flow path 24a curved in an S-shape. The flow path 24a includes a first curved section 24a-1 connected to the second joint portion 22 (the in-core 51 of the second pipe 102), a second curved section 24a-2 connected to the flow path 23a of the second connecting portion 23, and a straight section 24a-3 connecting the first curved section 24a-1 and the second curved section 24a-2.

[0037] The length of the center line of the flow path 24a is the same as the length of the center line of the flow path 14a of the first bent portion 14 of the first component member 11. The length of the first curved section 24a-1 is the same as the length of the first curved section 14a-1 of the first bent portion 14 of the first component member 11. The length of the second curved section 24a-2 is the same as the length of the second curved section 14a-2 of the first bent portion 14 of the first component member 11. The length of the straight section 24a-3 is the same as the length of the straight section 14a-3 of the first bent portion 14 of the first component member 11. The lengths of the straight section 14a-3 and the straight section 24a-3 are shorter than the length of the flow path 23a of the second connecting portion 23.

[0038] In the flow path 24a, the first curved section 24a-1, the second curved section 24a-2, and the straight section 24a-3 have substantially the same inner diameter (passing cross-sectional area), and this inner diameter is substantially the same as the inner diameter of the incore 51 attached to the second pipe 102. The opening of the first curved section 24a-1 facing the second joint portion 22 (second pipe 102) is tapered, like the first curved section 14a-1 of the first component member 11, so that the inner diameter gradually increases toward the incore 51 attached to the second pipe 102, thereby reducing flow path resistance.

[0039] The central axis L6 of the straight section 24a-3 intersects with the central axis L5 of the second connecting portion 23 at an angle θ4 of 90 degrees. The first curved section 24a-1 smoothly connects the second joint portion 22 (the internal space of the in-core 51 of the second pipe 102) and the straight section 24a-3. The second curved section 24a-2 smoothly connects the flow path 23a of the second connecting portion 23 and the straight section 24a-3.

[0040] In the universal fitting 1, hot and cold water flowing from the first pipe 101 (incore 51) into the first component 11 reaches the flow path 23a of the second component 21 via flow path 14a, and flows out from flow path 23a to flow path 24a into the second pipe 102 (incore 51). In the universal fitting 1, hot and cold water flowing from the second pipe 102 (incore 51) into the second component 21 reaches the flow path 14a of the first component 11 via flow path 24a and flow path 23a, and flows out from flow path 14a into the first pipe 101 (incore 51). In the universal fitting 1, each flow path 14a, 23a, 24a is set so that there is no difference in equivalent pipe length (pressure loss) in either flow direction, eliminating any concerns about directionality during installation.

[0041] The above embodiment provides the following advantageous effects. (1) The first component 11 and the second component 21 of the universal pipe joint 1 are capable of relative rotation about central axes L3 and L5, and can be transformed between an elbow-type pipe joint and a straight-type pipe joint. Furthermore, the portions of the universal pipe joint 1 excluding the lock ring 42 are capable of relative rotation with respect to the first pipe 101 about central axis L1 while the first pipe 101 remains in a state in which it is prevented from coming off, and are capable of relative rotation with respect to the second pipe 102 about central axis L2 while the second pipe 102 remains in a state in which it is prevented from coming off.

[0042] Therefore, even when the universal pipe fitting 1 is connected to a first pipe 101 that is fixed so that it cannot rotate on a construction surface, for example, it can rotate relative to the first pipe 101, and even when in the form of an elbow-type pipe fitting (when the second pipe 102 is not connected), the orientation of the second connecting part 23 is not limited, so there is no need to consider the orientation when connecting the first pipe 101, resulting in excellent construction ease.

[0043] (2) The flow path 23a in the second connecting portion 23 is linear. Therefore, the second connecting portion 23 and the first connecting portion 13 connected to the second connecting portion 23 can each be formed into a straight cylindrical shape that is long in the direction of the central axis L3. This ensures reliable connection between the first connecting portion 13 and the second connecting portion 23, and allows for stable relative rotation between, for example, the first component 11 and the second component 21. In particular, because the length of the flow path 23a is longer than the lengths of the straight section 14a-3 of the first bent portion 14 and the straight section 24a-3 of the second bent portion 24, the first connecting portion 13 and the second connecting portion 23 can be formed into a longer straight cylindrical shape, and therefore, allows for more stable relative rotation between the first component 11 and the second component 21.

[0044] (3) The first bent portion 14 of the first component member 11 and the second bent portion 24 of the second component member 21 have straight sections 14a-3 and 24a-3, respectively. Therefore, the first bent portion 14 and the second bent portion 24 can reduce the radii of curvature of the first curved sections 14a-1 and 24a-1 and the second curved sections 14a-2 and 24a-2 by the amount of the straight sections 14a-3 and 24a-3.

[0045] Therefore, the first connecting portion 13 can be positioned closer to the central axis L1, and the second connecting portion 23 can be positioned closer to the central axis L2.For example, when the universal pipe fitting 1 is configured as a straight-type pipe fitting, the protrusion of the first connecting portion 13 and the second connecting portion 23 in the radial direction of the central axes L1, L2 can be reduced, the projected area of the universal pipe fitting 1 in a side view can be reduced, making it easier to pass the universal pipe fitting 1 through an insertion hole in a wall, etc., and further improving workability.

[0046] (Another example) The above embodiment may be modified as follows. (1) The straight section 14a-3 is removed from the first bent portion 14, and the straight section 24a-3 is removed from the second bent portion 24.

[0047] (2) The first curved section 14a-1 and the straight section 14a-3 are deleted from the first bend portion 14, and the first joint portion 12 and the first connecting portion 13 are connected only by the second curved section 14a-2, and the first curved section 24a-1 and the straight section 24a-3 are deleted from the second bend portion 24, and the second joint portion 22 and the second connecting portion 23 are connected only by the second curved section 24a-2.

[0048] (3) The second curved section 14a-2 and the straight section 14a-3 are deleted from the first bent portion 14, and the first joint portion 12 and the first connecting portion 13 are connected only by the first curved section 14a-1, and the second curved section 24a-2 and the straight section 24a-3 are deleted from the second bent portion 24, and the second joint portion 22 and the second connecting portion 23 are connected only by the first curved section 24a-1.

[0049] (4) By making the inner peripheral surface of the first connecting portion 13 concave spherical and the outer peripheral surface of the second connecting portion 23 convex spherical, the connecting portion between the first connecting portion 13 and the second connecting portion 23 has a ball joint structure. In this way, the first component member 11 and the second component member 21 can rotate relatively around central axes other than the central axes L3 and L5, and the universal pipe joint 1 can be deformed in more ways.

[0050] (5) The length of the flow path 23a in the second connecting portion 23 is shorter than the lengths of the straight section 14a-3 of the first bent portion 14 and the straight section 24a-3 of the second bent portion 24.

[0051] (6) The length of the flow path 23a in the second connecting portion 23 is set to be the same as the length of the straight section 14a-3 of the first bent portion 14 and the straight section 24a-3 of the second bent portion 24.

[0052] (7) The flow path 23a in the second connecting portion 23 is curved.

[0053] (Addendum) The technical concept that can be understood from the above embodiment will be described. (i) A universal joint in which a first component having a first retention mechanism that prevents the first pipe from coming off while allowing it to rotate relative to itself, and a second component having a second retention mechanism that prevents the second pipe from coming off while allowing it to rotate relative to itself, are connected in a manner that allows them to rotate relative to each other, and which can be transformed between the form of an elbow-type pipe joint and the form of a straight-type pipe joint.

[0054] (b) The first component comprises a first joint portion to which the first pipe is connected, a cylindrical first connecting portion connected to the second component, and a first bent portion connecting the first joint portion and the first connecting portion, and the second component comprises a second joint portion to which the second pipe is connected, a second connecting portion that is inserted into and connected to the first connecting portion of the first component and has a linear flow path formed therein, and a second bent portion connecting the second joint portion and the second connecting portion, and the flow path within the second connecting portion is linear. A universal pipe fitting as described in technical idea (a).

[0055] (c) A universal pipe joint according to technical idea (b), wherein the flow path of the first bent portion and the flow path of the second bent portion each have a straight section.

[0056] (d) A universal fitting according to technical idea (c), wherein the length of the flow path in the second connecting portion is longer than the length of the straight section of the first bend portion and the straight section of the second bend portion. [Explanation of symbols]

[0057] 1... Universal joint 11...First component 12...First joint 13...first connecting portion, 13a...engagement groove, 13b...positioning surface 14...first bent portion, 14a...flow path, 14a-1...first curved section, 14a-2...second curved section, 14a-3...straight section 21...Second component 22...Second joint 23... second connecting portion, 23a... flow path, 23b... accommodation groove, 23c... engagement groove, 23d... flange 24...second bent portion, 24a...flow path, 24a-1...first curved section, 24a-2...second curved section, 24a-3...straight section 31... Joint body, 31a... Female thread, 31b... Locking step, 31c... Positioning surface, 31d... Accommodation groove 32...pressure ring, 32a...male screw, 32b...insertion hole, 32c...spanner hook, 32d...accommodating groove 41...O-ring 42...Lock ring, 41a...Base ring, 41b...Regulating piece 43...Spacer 44...O-ring 45...O-ring 46...Retaining ring 51...In-core, 51a...Cylinder part, 51b...Brim part 101...First Pipe 102...Second pipe L1: Center axis of the first pipe and the first joint L2: Center axis of the second pipe and second joint L3: Center axis of the first connecting part L4: Center axis of the straight section 14a-3 L5: Center axis of the second connecting part L6: Center axis of the straight section 24a-3 θ1~θ4...Angles

Claims

[Claim 1] a first component having a first retaining mechanism that retains the first pipe in a state where the first pipe can rotate relative to the first pipe, and a second component having a second retaining mechanism that retains the second pipe in a state where the second pipe can rotate relative to the first pipe, are connected to each other so as to be able to rotate relative to the first pipe, and the coupling can be transformed between an elbow-type pipe coupling and a straight-type pipe coupling, the first component member has a cylindrical first connecting portion connected to the second component member, and the second component member has a second connecting portion inserted into and connected to the first connecting portion of the first component member, the second connecting portion having a flow path formed therein; a positioning surface that contacts the tip end surface of the second connecting portion is formed on an inner peripheral surface of the first connecting portion over the entire periphery, an outer peripheral portion of a tip surface of the second connecting portion abuts against the positioning surface along the entire circumference; A universal pipe joint in which an inner peripheral portion of the tip surface of the second connecting portion abuts against the positioning surface in a portion of the circumferential direction and does not abut against the positioning surface in the remaining portion of the circumferential direction.

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