JP2012211605A - Universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a universal joint in which angle adjustment can be performed smoothly and which can exhibit stable water stop performance.SOLUTION: The universal joint 10 includes a socket joint 12 and a spigot joint 14 and enables angle adjustment by connecting the socket joint 12 to the spigot joint 14 with a relative position changed therebetween. One end of a straight piping portion 16 of the socket joint 12 is formed by inclining at the first angle with respect to a surface orthogonal to its axis and is formed with an inclined socket 18 defining direction orthogonal to it from the inclined surface 20 as axis. An inclined spigot 32 is provided on one end portion of a straight piping portion 30 of the spigot joint 14, whereas a spigot tip surface 34 the axis of which is inclined at the second angle with respect to the axis of the straight piping portion 30 is formed on one end side of the inclined spigot 32. In addition, a ring member 50 is provided for "a rotation margin" between the inclined socket 18 and the inclined spigot 32. The ring member 50 is a plate-like body formed into a hollow circle and is interposed between the inclined surface 20 of the inclined socket 18 and the spigot tip surface 34 of the inclined spigot 32.

Description

  The present invention relates to a universal joint, and more particularly to a universal joint for connecting tubes with a predetermined connection angle.

An example of a conventional universal joint is disclosed in Patent Document 1. In the universal joint disclosed in Patent Document 1, the first pipe connection portion and the second pipe connection portion are abutted with each other on inclined surfaces inclined at a predetermined angle with respect to the respective axes, and both are rotated with respect to each other. As a result, the connection angle is changed. And between the insertion opening of the 1st pipe connection part and the receiving opening of the 2nd pipe connection part, it is stopped by the rubber ring for water stop attached to the outer surface of an insertion opening.
JP 200222025 [F16J 15/32]

  In the technique of Patent Document 1, in order to smoothly adjust the angle of the universal joint, in consideration of slidability at the time of rotation, the insertion of the first pipe connection portion and the second pipe connection portion It is preferable to have a slight “rotation (play)” between the receiving port and the receiving port.

  However, by providing “rotation allowance”, the slidability between the insertion opening of the first pipe connection portion and the reception opening of the second pipe connection portion is improved, but on the other hand, the inside of the universal joint is There was a case where sand and soil mixed in the flowing water entered the water stop rubber ring from the “rotation”. For example, if the first pipe connection part and the second pipe connection part are rotated in a state where invaded sand or soil is adhered, the water stop performance of the water stop rubber ring may be lowered.

  Therefore, the main object of the present invention is to provide a novel universal joint.

  Another object of the present invention is to provide a universal joint capable of smoothly adjusting the angle and exhibiting stable water stopping performance.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  1st invention is a universal joint for connecting pipes with a predetermined connection angle, and is provided with an inclination joint having a connection end face inclined at the first angle, A receiving joint provided with an inclined receiving opening having a connecting end face inclined at an angle, and a tilt opening having a predetermined margin of rotation while sealing the gap between the inclined receiving opening and the inclined receiving opening with a rubber ring. It is a universal joint provided with the ring member interposed in the received state between the connection end surface of an inclination receptacle, and the connection end surface of an inclination difference port.

  In the first invention, the universal joint (10) is for connecting pipes with a predetermined connection angle, and includes a receiving joint (12) and a differential joint (14). The angle can be adjusted by changing the relative positions of the receiving joint and the connecting joint. The receiving joint includes a straight pipe part (16) having a predetermined diameter, and at one end of the straight pipe part, a connecting end face (20) whose axis is inclined at a first angle with respect to the axis of the straight pipe part. The slant receptacle (18) is provided continuously. Further, the differential joint includes a straight pipe portion (30) having a predetermined diameter, and an inclined differential port (32) is continuously provided at one end of the straight pipe portion. A connection end surface (34) whose axis is inclined at a second angle with respect to the axis of the straight pipe portion is formed on one end side of the inclined difference port. A rubber ring (38) is provided between the inclined receiving port and the inclined difference port. Furthermore, a ring member (54) is provided in the "rotation margin" for ensuring the slidability between the inclined receiving port and the inclined difference port. The ring member is, for example, a plate-like body formed in a hollow circle with a uniform width, and is interposed between the connection end surface of the inclined receiving port and the connection end surface of the inclined difference port. For example, the opening (56a) of the ring body (56) of the ring member is formed in a perfect circle having substantially the same diameter as the opening (20a) of the connection end surface of the inclined receiving port and the opening (34a) of the connection end surface of the inclined difference opening. Has been.

  According to the first aspect of the present invention, the inside of the universal joint can be obtained by absorbing the “rotation margin” between the receiving joint and the outlet joint by the thickness of the ring member or dividing the “rotation margin” by the ring member. It can prevent the sand and soil mixed in the flowing water from entering the “rolling margin”. Accordingly, it is possible to avoid a decrease in the water stop performance of the universal joint.

  Moreover, by adjusting the thickness of the ring member to be sufficiently smaller than the dimension of the “rotation allowance”, the “rotation” of sand and earth can be avoided while avoiding an increase in rotational resistance between the receiving joint and the joint. It is possible to exert the effect of preventing intrusion into “shiro”.

  The second invention is dependent on the first invention, and the thickness of the ring member is set based on the relationship of Formula 1. [Equation 1] MN <1 where M is the dimension of the rotating margin (mm), and N is the thickness (mm) of the ring member.

  In the second invention, the thickness of the ring member (54) is set to a dimension of “rotation allowance” for ensuring the slidability between the inclined receiving opening (18) and the inclined difference opening (32), for example, the inclination receiving opening. The value obtained by subtracting the thickness N of the ring main body (56) of the ring member from the distance M between the inclined surface (20) and the front end surface (34) of the inclined outlet is set to be smaller than 1 mm.

  According to the second invention, it is possible to surely prevent sand or earth having a particle size of 1 mm or more from entering the “rotation margin”, so that the rubber ring is less likely to be damaged, and the universal joint has its water stopping performance. Can be maintained for a longer period of time.

  3rd invention is dependent on 1st or 2nd invention, and is further provided with the convex part which protrudes and is provided in the surface of a ring member.

  In 3rd invention, the convex part (58) which protrudes and is formed in the surface of the ring main body (56) of a ring member (54) is provided. For example, the convex portion is a protrusion having a semicircular cross-section and a protrusion that is continuous in the circumferential direction of the ring body.

  According to the third aspect of the invention, since the convex portion of the ring member makes a line contact or a point contact with the connection end surface in a state where the inclined receiving port receives the inclined difference port, the receiving joint and the differential opening joint are rotated with each other. Friction resistance when moving can be reduced. Therefore, the angle adjustment of the universal joint can be performed more smoothly.

  According to this invention, since the ring member is provided at the “rotation margin” between the inclined receiving port and the inclined difference port, the water stop performance is deteriorated without increasing the rotational resistance between the receiving port joint and the differential port joint. Can be avoided.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is an illustration figure which shows an example of the structure of the universal joint used as the background of this invention. It is a top view which shows the receiving joint of FIG. It is sectional drawing which shows the receiving joint of FIG. FIG. 3 is a plan view showing the differential joint of FIG. 1. FIG. 2 is a cross-sectional view showing the differential joint of FIG. 1. It is an illustration figure which shows the structure of the universal joint of one Example of this invention. It is an expanded sectional view which shows the connection part of a receiving joint and a gage joint in the universal joint of FIG. (A) is a top view which shows the ring member of FIG. 6, (b) is sectional drawing which shows the ring member of (a). It is an illustration figure which shows the dimension of the "rotation margin" and the thickness dimension of a ring member of a receptacle joint and a joint of FIG. (A) is a top view which shows the ring member in the universal joint of other Examples of this invention, (b) is sectional drawing which shows the ring member of (a). It is an expanded sectional view which shows the connection part of a receiving joint and a differential fitting in the universal joint of FIG. (A) is a top view which shows the ring member in the universal joint of other Example of this invention, (b) is sectional drawing which shows the ring member of (a). It is sectional drawing which shows the ring member in the universal joint of other Example of this invention. It is an expanded sectional view which shows the connection part of a receiving joint and a differential fitting in the universal joint of FIG.

  FIG. 1A and FIG. 1B illustrate an example of a universal joint 10 which is the background of the present invention. The universal joint 10 is for connecting two pipes (not shown) with a predetermined connection angle. For example, the universal joint 10 is used in a sewer pipe or the like, and includes a receiving joint 12 and a differential joint 14. Yes. Then, the connection joint angle is changed from 0 to 2α by abutting the reception joint 12 and the connection joint 14 at the joint end surfaces inclined at a predetermined angle α with respect to the respective axis lines and rotating each other through the joint end surfaces. It can be changed within the range.

  Hereinafter, such a universal joint 10 will be described within the scope necessary for understanding the present invention, which will be described later, with reference to FIGS.

  As shown in FIGS. 2 and 3, the receiving joint 12 includes a straight pipe portion 16 made of a synthetic resin such as vinyl chloride and having a predetermined diameter. At one end of the straight pipe portion 16, an inclined receiving port 18 whose axis P is inclined at a predetermined angle α with respect to the axis Q of the straight pipe portion 16 is continuously provided. The inclined receiving port 18 is set to an appropriate diameter and length so as to receive the differential port joint 14 with a predetermined connection angle.

  For example, in this embodiment, one end surface of the straight pipe portion 16 is formed to be inclined at an angle α with respect to a surface orthogonal to the axis Q, and the direction orthogonal to the peripheral portion of the inclined surface 20 is defined as the axis P. As shown in FIG. The inclined surface 20 is formed so as to be a hollow circle having a uniform width. As will be described in detail later, in the state where the inclined receptacle 18 receives the inclined receptacle 32, the outlet of the inclined receptacle 32 is provided. The tip surface 34 abuts on or is close to the inclined surface 20. That is, the inclined receiving port 18 has an inclined surface 20 at its innermost part (base end portion), and the inclined surface 20 does not contact the front end surface 34 of the inclined difference port 32 in the inclined receiving port 18. It becomes the connection end face to be brought close to.

  On the inner surface of the inclined receiving port 18, an annular groove 22 extending in parallel with the inclined surface 20 is formed on the tip side. Then, when the inclined receiving port 18 receives the gage joint 14, a locking ring 42 described later is fitted into the annular groove 22.

  The receiving joint 12 is a ribbed tube, and a plurality of circumferential ribs 24 are formed at intervals on the outer surfaces of the straight pipe portion 16 and the inclined receiving port 18. The other end of the straight pipe portion 16 serves as a gap for connection with the other pipe described above, and a rubber ring 26 is mounted between predetermined ribs on the outer surface of the gap.

  Further, two handles 28 are provided at a predetermined position on the outer surface of the straight pipe portion 16 (in this embodiment, the end portion on the inclined receiving port 18 side) at an interval of 180 degrees in the circumferential direction. The handle 28 is used by being gripped by an operator or attached with a jig when changing the connection angle.

  As shown in FIGS. 4 and 5, the outlet joint 14 is made of a synthetic resin such as vinyl chloride and includes a straight pipe portion 30 having a predetermined diameter, like the receiving joint 12. An inclined difference port 32 is continuously provided at one end of the straight tube part 30, and an axis S of the inclined difference port 32 is predetermined with respect to an axis R of the straight tube part 30 at a predetermined end side. A front end face 34 of the opening inclined at an angle α is formed. The inclination difference port 32 is set to an appropriate diameter and length so as to be received by the inclination receiving port 18 with a predetermined connection angle.

  For example, in this embodiment, the outer surface of the inclined difference port 32 is formed in a taper shape with the front end surface 34 as a reference surface and the direction perpendicular thereto as the axial direction. The opening (inner diameter portion) of the inclined difference port 32 is formed in a short tubular shape having a circular cross section coaxial with the axis R of the straight pipe portion 30, and the diameter is set to be the same as that of the straight pipe portion 16 of the receiving joint 12. Is done. Further, the front end surface 34 of the opening is a connection end surface that is in contact with or close to the inclined surface 20 of the inclined receiving port 18 in the inclined connecting port 32, and is uniform like the inclined surface 20 of the inclined receiving port 18 described above. It is formed to be a hollow circle with a width. Moreover, the opening (inner diameter part) 34a of the front end surface 34 of the opening is formed in a substantially circular shape having the same diameter as the opening 20a of the inclined surface 20 of the inclined receiving port 18 (see FIG. 1). Therefore, when the slant receiving port 18 receives the spigot joint 14, the spigot joint 12 and the spigot joint 14 are connected without causing a step on the inner surface.

  In addition, a rubber ring housing portion 36 is formed on the outer surface of the inclined port 32 so as to be parallel to the front end surface 34 of the port, and a rubber ring 38 is attached to the rubber wheel housing portion 36. As the rubber ring 38, a conventionally known rubber ring can be appropriately used, and since it is not the gist of the present invention, a detailed description thereof will be omitted. Since such a rubber ring 38 is described in detail in the above-mentioned Patent Document 1, refer to it if necessary.

  An annular groove 40 is formed on the outer surface of the inclined slot 32 at a position corresponding to the annular groove 22 of the inclined receptacle 18 so as to be parallel to the distal end face 34 of the inclined socket 18. 42 is mounted.

  The locking ring 42 is a ring formed of, for example, vinyl chloride and having a rectangular cross section. When the inclined receiving port 18 receives the differential joint 14, the locking ring 42 is formed with the annular groove 22 on the inner surface of the inclined receiving port 18. It is set to a predetermined circumferential width, axial length and height so as to fit into and engage with the annular groove 40 on the outer surface of the inclined difference port 32. However, the locking ring 42 may be attached to the annular groove 22 of the inclined receiving port 18.

  The spigot joint 14 is a ribbed tube, and a plurality of circumferential ribs 44 are formed on the outer surface of the straight pipe portion 30 at intervals. The diameter of the straight pipe portion 30 is set to be slightly larger than the diameter of the straight pipe portion 16 of the receiving joint 12, and the other end portion is a receiving port for connection with the other pipe described above. It becomes. At the other end portion of the straight pipe portion 30, a tapered portion 46 having a diameter increasing toward the distal end side is formed.

  Further, two handles 48 are provided at a predetermined position on the outer surface of the straight pipe portion 30 (in this embodiment, the end portion on the side of the inclination difference port 32) with an interval of 180 degrees in the circumferential direction. The handle 48 is used by being gripped by an operator or attached with a jig when changing the connection angle.

  With reference to FIG. 1, when connecting such a mouthpiece joint 12 and a mouthpiece joint 14, the sloped mouth 32 of the mouthpiece joint 14 is inserted into the sloped mouth 18 of the mouthpiece joint 12, The inclined receptacle 18 is received by the inclined receptacle 18. At this time, the inclined receiving port 18 is received in a state where the inclined receiving port 18 has “rotate (or play)”. That is, by providing a slight gap between the inclined surface 20 of the inclined receiving port 18 and the front end surface 34 of the inclined difference port 32, the sliding property between the inclined receiving port 18 and the inclined difference port 32 is improved. Secure.

  When the front end surface 34 of the inclination difference port 32 is brought into contact with or close to the inclined surface 20 of the inclination reception port 18, the inclination reception port 18 and the inclination difference port 32 are joined to each other by a rubber ring 38. The stop ring 42 fits into the annular groove 22 and the annular groove 40 and locks them, so that the inclination difference port 32 is prevented from coming off from the inclination receiving port 18.

  Further, such a universal joint 10 can be angle-adjusted in the range of 0 to 2α degrees by connecting the receiving joint 12 and the joint 14 by changing the relative positions thereof.

  For example, in order to obtain a state of a connection angle of 0 degrees as shown in FIG. 1A, the inclined joint 32 of the joint 14 is inserted into the inclined joint 18 of the joint 12 and the joint 12 is received. Both the shaft Q of the straight pipe portion 16 and the axis R of the straight pipe portion 30 of the differential joint 14 are rotated in parallel. When the joint 14 is rotated 180 degrees around the axis S from the arrangement shown in FIG. 1A, a connection state at a maximum angle of 2α degrees can be obtained as shown in FIG.

  When the universal joint 10 is manufactured, the receiving joint 12 and the connecting joint 14 may be manufactured separately and connected to each other. The receiving joint 12 and the connecting joint 14 are manufactured by injection molding or the like. To do.

  The universal joint 10 as the background art of the present invention has been described above. In the following, examples and embodiments of the present invention will be described on the premise of such background technology, with the use of them as necessary.

  However, the present invention relates to the connection between the receptacle joint 12 and the joint 14 according to the background art described above, and the remaining part may be the same as the background art or may be changed from the background art. It should be noted in advance that all of these embodiments are illustrated and described with a focus on the inclined receptacle 18 of the receptacle joint 12 and the inclined receptacle 32 of the receptacle joint 14.

  Referring to FIG. 6, the universal joint 10 according to the embodiment of the present invention is different from the universal joint 10 of FIG. 1 in that a new concept is incorporated in the connection between the receiving joint 12 and the differential joint 14. . In the universal joint 10, a ring member 50 is provided at the “rotation margin” between the inclined receiving port 18 and the inclined difference port 32.

  As shown in FIGS. 7 and 8, the ring member 50 has an inclined surface of the inclined receiving port 18 in order to prevent sand and soil from entering the “rotation margin” between the inclined receiving port 18 and the inclined difference port 32. 20 and the front end face 34 of the inclined front end 32, and includes a ring body 52. However, it should be noted that in FIG. 8, the thickness of the ring main body 52 is illustrated larger than the actual thickness for illustration. The same applies hereinafter.

  The ring body 52 is a hollow circular plate having a uniform width, and is made of a synthetic resin such as a vinyl chloride resin, and is manufactured, for example, by stamping or injection molding. However, the material of the ring body 52 may be other materials, for example, a synthetic resin such as polyethylene or polypropylene, or a metal such as stainless steel.

  The outer diameter of the ring main body 52 is set to be substantially the same diameter as the inclined surface 20 of the inclined receiving port 18 and the front end surface 34 of the differential port joint 14. Further, the opening (inner diameter portion) 52a of the ring body 52 is formed in a perfect circle shape having a diameter substantially the same as or larger than the opening 20a of the inclined surface 20 and the opening 34a of the front end surface 34 of the difference port.

  As shown in FIG. 9, the thickness of the ring main body 52 is such that the axial dimension of the “rotation margin” between the inclined receiving port 18 and the inclined difference port 32, that is, the difference between the inclined surface 20 of the inclined receiving port 18 and the inclined difference port 32. The value obtained by subtracting the thickness N of the ring body 52 from the distance M from the mouth tip surface 34 is set to be smaller than 1 mm (M−N <1). Note that the axial dimension M of the “rotation margin” between the tilt receptacle 18 and the tilt slot 32 varies by a few millimeters in the circumferential direction. The maximum value is used for the axial dimension M of the “rotation margin” with 32. In this embodiment, the axial dimension M of the “rolling margin” between the inclined receiving port 18 and the inclined difference port 32 is, for example, 1.2 mm to 1.5 mm, and the thickness of the ring body 52 is, for example, 0.5 to 0.8 mm.

  In such a universal joint 10, since the ring member 50 is interposed between the inclined surface 20 of the inclined receiving port 18 and the front end surface 34 of the inclined connecting port 32, the inclined receiving port 18 and the inclined connecting port 32. The "rotation margin" is absorbed by the thickness of the ring member 50 (the ring main body 52), or the "rotation margin" is divided by the ring member 50, thereby substantially reducing the size of the "rotation margin". Thus, it is possible to prevent the sand and soil mixed in the water flowing in the universal joint 10 from entering the “rotating margin”.

  Therefore, since sand or soil does not reach or is reduced to the rubber ring 34 of the universal joint 10, it is possible to avoid a decrease in the water stop performance of the universal joint 10 due to damage of the rubber ring 34.

  In addition, in this embodiment, even if the ring member 50 is formed into a plate shape that is sufficiently thinner than the dimension of the “rotation allowance”, the “rotation allowance” is divided by the ring member 50 so that “rotation” is achieved. It is possible to limit the size of sand and soil that can enter the margin and to exert the effect of preventing the penetration of sand and soil into the “rotation margin”. That is, it is possible to exhibit the effect of preventing sand and soil from entering the “rotation margin” without narrowing the “rotation margin” between the inclination receiving port 18 and the inclination difference port 32.

  Therefore, for example, when the “rotation margin” is narrowed, the rotational resistance between the receiving joint 12 and the joint 14 increases accordingly. According to this embodiment, the thickness of the ring member 50 is increased. By appropriately adjusting, it is possible to exhibit an effect of preventing the sand and soil from entering the “rotation margin” while avoiding an increase in rotational resistance between the receiving joint 12 and the joint 14.

  As described above, according to this embodiment, the angle adjustment of the universal joint 10 can be performed smoothly, and stable water stopping performance can be exhibited.

  Further, in this embodiment, sink marks and warpage occur on the inclined surface 20 of the receiving joint 12 and the front end surface 34 of the connecting joint 14 during molding, so that the connection end surfaces of the receiving joint 12 and the connecting joint 14 are changed. Even if it becomes a nonuniform shape, the increase in rotational resistance can be suppressed more by making the ring member 50 follow the nonuniform shape.

  Further, in this embodiment, the thickness of the ring main body 52 of the ring member 50 is set to a value obtained by subtracting the thickness N of the ring main body 52 of the ring member 50 from the axial dimension M of the “rotation”. Has been. Therefore, it is possible to reliably prevent the sand or soil having a particle diameter of 1 mm or more from entering the “rotating margin”.

  Here, according to an experiment conducted by the inventors of the present application to evaluate the particle size of sand and soil and the damage of the rubber ring 34 for each particle size, sand and soil having a particle size of 1 mm to 1.44 mm are made of rubber. If the receiving joint 12 and the spigot joint 14 are rotated with the ring 34 engaged, the rubber ring 34 is damaged and water leakage is induced. However, sand or soil having a particle size of less than 1 mm is removed from the rubber ring 34. It was confirmed that even if the receiving joint 12 and the spigot joint 14 are rotated in a state where the rubber ring is bitten, the rubber ring 34 is hardly damaged and water leakage is not induced. From these experimental results, it can be said that in order to maintain the water stop performance of the rubber ring 34 of the universal joint 10, it is desirable to prevent the intrusion of sand or soil having a particle diameter of 1 mm or more into the “rotation allowance”. . In addition, sand and soil having a particle size larger than 1.44 mm are excluded because they are very unlikely to enter the “rotating margin” in consideration of the axial dimension of the “rotating margin”.

  Therefore, as in this embodiment, the value obtained by subtracting the thickness N of the ring main body 52 of the ring member 50 from the axial dimension M of the “rotation margin” is set to be smaller than 1 mm, and the particle size is 1 mm or more. By preventing intrusion of sand and soil into the “rotation margin”, the universal joint 10 can maintain its water stopping performance for a longer period of time.

  By the way, in order to prevent sand and soil having a particle size of 1 mm or more from entering the “rotation margin”, the axial dimension M of the “rotation margin” of the receiving joint 12 and the joint 14 is set to 1 mm or less in advance. Although it is conceivable to set and manufacture, in such a universal joint 10, the factor from the front end surface 34 to the annular groove 40 (locking ring 42) is a factor that causes the axial dimension M of “rotation” to fluctuate. 5, the axial dimension of the annular groove 40, the distance from the inclined surface 20 to the annular groove 22, the axial length of the annular groove 22, and the axial dimension of the locking ring 42. Even if the tolerances are controlled with general tolerances (for example, 0.2 to 0.3 mm), if errors are accumulated by combining them, the axial dimension M of “rotate” is eventually 1 mm or less. It is uncertain whether or not. In addition, since the inclined surface 20 of the receiving joint 12 and the front end surface 34 of the connecting joint 14 have a complicated shape with non-uniform thickness, sinks and warpage are likely to occur. In consideration of the slidability between the joint 12 and the joint 14, the ring member is manufactured by setting the axial dimension M of the “rotation margin” between the joint 12 and the joint 14 to be large in advance. It can be said that the method of adjusting according to the thickness of the ring main body 52 is reliable.

  Furthermore, in this embodiment, the opening 52a of the ring main body 52 is formed in a perfect circle shape having a diameter substantially the same as or larger than the opening 20a of the inclined surface 20 and the opening 34a of the front end surface 34. Therefore, when the inclined receiving port 18 receives the port joint 14 with the ring member 50 interposed therebetween, the state of the inner surface at the connection portion between the port joint 12 and the port joint 14 is smooth and continuous without a convex portion. It becomes an optimal flow path in which a fluid such as sewage drains smoothly without being trapped and staying in place.

  In the above-described embodiment, one ring member 50 is interposed between the inclined surface 20 of the inclined receiving port 18 and the front end surface 34 of the inclined difference port 32. However, the present invention is not limited to this. There is no. By using multiple ring members 50 of the same thickness or different thicknesses according to the shape and dimensions of the universal joint 10 as well as sink marks and warping during molding, it is possible to cope with individual differences in “rotation allowance”. become.

  Further, in the above-described embodiment, the plate-shaped ring member 50 is interposed between the inclined surface 20 of the inclined receiving port 18 and the front end surface 34 of the inclined differential port 32, but these are shown in FIGS. As described above, the ring member 50 may be provided with a convex portion 54 that protrudes from the surface of the ring main body 52.

  As shown in FIG. 10, the convex portion 54 is a protrusion having a semicircular cross section (or a semielliptical cross section), and is formed integrally with the ring main body 52 on one side of the surface of the ring main body 52. In addition, one or a plurality of, in this embodiment, four convex portions 54 are provided in the circumferential direction of the ring main body 52 at a predetermined interval. The axial dimension (that is, height) of the convex portion 54 is, for example, 0.1 to 0.8 mm. Note that the thickness N of the ring main body 52 of the ring member 50 is a value that indicates the thickness of the ring main body 52 to the last, and therefore the thickness N of the ring main body 52 of the ring member 50 includes the thickness of the convex portion 54. Note that axial dimensions are not considered.

  Then, as shown in FIG. 11, the ring member 50 has the inclined surface 20 of the inclined receiving port 18 and the front end surface of the inclined port 32 so that the convex portion 54 faces the inclined front surface 34 of the inclined port 32. 34.

  By doing so, the convex portion 54 of the ring member 50 is brought into point contact with the inclined tip surface 34 in a connected state where the inclined receiving port 18 receives the inclined difference port 32, and Since the contact area can be reduced, it is possible to reduce the frictional resistance when the receiving joint 12 and the opening joint 14 are rotated. Therefore, the angle adjustment of the universal joint 10 can be performed more smoothly.

  In addition, by reducing the contact area between the ring member 50 and the inclined front end surface 34 and reducing the frictional resistance of the receiving joint 12 and the connecting joint 14, the “rotation of the inclined receiving opening 18 and the inclined connecting opening 32 can be achieved. Even if the margin is reduced, the slidability of the receiving joint 12 and the differential joint 14 can be maintained. That is, by reducing the “rotation margin” between the inclined receiving port 18 and the inclined difference port 32 by the amount of reduced frictional resistance, it is possible to further limit the size of sand and soil that can enter the “rotation margin”. It is.

  The convex portion 54 is not necessarily formed as a projection having a semicircular cross section, and by reducing the contact area between the ring member 50 and the inclined front end surface 34, the frictional resistance of the receiving joint 12 and the differential joint 14 is reduced. The shape is not particularly limited as long as it can be reduced.

  For example, as shown in FIG. 12, the convex portion 54 may be formed as a protrusion having a semicircular cross-section (or semi-elliptical cross-section) projection continuous in the circumferential direction of the ring body 52. In this case, the convex portion 54 of the ring member 50 is in line contact with the inclined front end surface 34 with the inclined receiving port 18 receiving the inclined difference port 32, and the ring member 50 and the inclined front end surface 34 are in contact with each other. The contact area can be reduced. By doing so, the “rotation allowance” between the inclination receiving port 18 and the inclination difference opening 32 is reduced by the amount corresponding to the reduced frictional resistance, and the size of sand and soil that can enter the “rotation allowance” is further limited. In addition, the intrusion of sand and soil can be physically prevented by the convex portion 54.

  Although not shown, the convex portion 54 is formed not only on a semicircular cross-sectional (or semi-elliptical cross-section) projection or protrusion, but also on the protrusion or protrusion having a rectangular cross section. You may make it do. In this case, although the convex portion 54 of the ring member 50 is in surface contact with the inclined front end surface 34, the contact area between the ring member 50 and the inclined front end surface 34 is reduced, so that the frictional resistance is reduced. It is possible to further reduce the size of sand and soil that can enter the “rotation margin” by reducing the “rotation margin” between the inclination receiving port 18 and the inclination difference port 32.

  Further, in any of the above, it is not necessary to arrange the ring member 50 so that the convex portion 54 is opposed to the inclined front end surface 34 of the inclined difference port 32, and the convex portion 54 is opposed to the inclined surface 20 of the inclined receiving port 18. Needless to say, the ring member 50 may be arranged as described above.

  Furthermore, as shown in FIG. 13, convex portions 54 may be formed on both sides of the surface of the ring main body 52. In this way, when the ring member 50 is provided at the “rotation margin” between the receiving joint 12 and the joint 14, the convex portion 54 on one side of the surface of the ring main body 52 is formed as shown in FIG. 14. Since the convex portion 54 on the other side of the surface of the ring main body 52 is opposed to the inclined surface 20 of the inclined receiving port 18 while facing the inclined tip surface 34 of the inclined difference port 32, the ring member 50 is inclined to the inclined surface 20. And it will not approach either one side of the inclined front end surface 34. Therefore, it is possible to appropriately divide the “rotation margin” by the ring member 50 and more reliably limit the size of sand and soil that can enter the “rotation margin”.

  In the ring member 50 in FIG. 13, the convex portions 54 are formed one by one at both sides of the surface of the ring main body 52 and symmetrically. However, the present invention is not limited to this. For example, the convex portion 54 may be formed at an arbitrary position on each surface of the ring main body 52. Further, on each surface of the ring main body 52, the plurality of convex portions 54 may be formed concentrically, for example.

  Furthermore, in the above-described embodiment, the receiving joint 12 and the outlet joint 14 are configured as ribbed pipes. However, the receiving joint 12 and the outlet joint 14 are general ribless pipes without ribs. It may be configured as.

  Furthermore, in the above-described embodiment, the other end of the straight pipe portion 16 of the receiving joint 12 serves as a gap for connection to other pipes. However, the receiving end depends on the end structure of the pipe to be connected. A mouth may be formed. Moreover, although the other end part of the straight pipe part 30 of the port joint 14 became a receiving port for connection with another pipe | tube, you may make it form a port similarly.

  Further, in the above-described embodiment, the inclination angle of the inclined surface 20 of the inclination receiving port 18 and the inclination angle of the front end surface 34 of the inclination difference port 32 are set to the same angle α, but these inclination angles are the same. Even if it is not, if it is formed at a predetermined angle, the same effect as described above can be obtained. For example, if the inclination angle of the inclined surface 20 of the inclined receiving port 18 is α and the inclined angle of the front end surface 34 of the inclined difference port 32 is β, the universal joint 10 has the receiving joint 12 and the differential joint 14. The angle can be adjusted in the range from (α−β) to (α + β) degrees by changing the relative positions of and.

  Still further, other pipes connected to the universal joint 10 may be pipe joints or other pipe structures.

  It should be noted that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

DESCRIPTION OF SYMBOLS 10 ... Universal joint 12 ... Receptacle joint 14 ... Fitting joint 18 ... Inclined receptacle 20 ... Inclined surface (connection end surface)
24 ... Rubber ring housing part 26 ... Rubber ring 32 ... Inclined slot 34 ... Front end face of the outlet (connection end face)
50 ... Ring member 54 ... Projection

Claims (3)

A universal joint for connecting pipes with a predetermined connection angle,
A spigot joint provided with a slanted spigot having a connecting end face inclined at a first angle;
A receiving joint provided with an inclined receiving port having a connection end surface inclined at a second angle, and a rotating margin of a predetermined size while the inclined receiving port is sealed with a rubber ring between the inclined receiving port and the inclined receiving port. A universal joint comprising a ring member interposed between the connection end surface of the inclined receptacle and the connection end face of the inclined receptacle in a state in which the inclined receptacle is received. The universal joint according to claim 1, wherein the thickness of the ring member is set based on the relationship of Equation 1.
[Equation 1]
MN <1
However, M is the dimension of the rotating margin (mm), and N is the thickness (mm) of the ring member.   The universal joint according to claim 1, further comprising a protrusion provided to protrude from the surface of the ring member.

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