JP7356122B2 - Oil-air distributor and oil-air distribution structure - Google Patents

Description

The present invention relates to a cartridge type oil/air distributor that distributes oil/air, and an oil/air distribution structure.

The distributor of the oil-air lubricating device described in Patent Document 1 is incorporated into a chock that constitutes a bearing portion of a roller of a rolling mill or the like, and supplies oil-air to the bearing. Such a distributor can supply oil and air to the bearing portion by being arranged together with a spacer and the like in a circular hole bored in the chock of the bearing.

Japanese Patent Application Publication No. 10-213290

When a distributor is provided in a circular hole drilled in a chock as in Patent Document 1, an elastic member such as an O-ring may be provided on the outer periphery of the distributor in order to prevent oil/air leakage. However, there is room for improvement in that when the distributor is inserted into the circular hole bored in the chock, the elastic member is damaged at the edge of the supply hole toward the bearing, making it impossible to ensure sealing performance.

The oil/air distributor of the present invention is arranged in an oil/air supply channel provided in a housing that houses a lubrication object, and includes an oil/air branch channel provided in the middle of the oil/air supply channel from the oil/air supply channel. A cartridge-type oil-air distributor that distributes oil-air to the oil-air branch, the cartridge-type oil-air distributor being disposed at a branch part where the oil-air supply channel and the oil-air branch channel are connected, and distributing the oil-air flowing through the oil-air supply channel to the oil-air branch. a distribution part distributing to the flow path; an outlet joint part connected to the distribution part on the downstream side of the branch part in the oil/air supply flow path; an elastic member, the elastic member is fitted around the outer periphery of the end of the outlet joint, and is compressed by a force in the thickness direction of the elastic member, so that the outer diameter becomes equal to the outer diameter of the outlet joint. The outer diameter of the inner wall is larger than the outer diameter of the inner wall, and the outer diameter of the outer diameter of the inner wall is larger than that of the inner wall defining the oil/air supply flow path, thereby sealing between the inner wall and the end of the outlet joint.

According to the present invention, it is possible to provide an oil/air distributor that prevents damage to the elastic member and improves sealing performance.

FIG. 1 is a perspective view of an oil/air distributor according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the oil-air distributor of FIG. 1; FIG. 2 is a sectional view of an oil/air distribution structure including the oil/air distributor of FIG. 1; FIG. 2 is a diagram showing a change in the outer diameter of the elastic member of the oil/air distributor of FIG. 1 when a force is applied in the thickness direction.

(How the present invention was achieved)
Generally, the distribution structure of an oil-air lubrication device is provided outside the object to be lubricated. Oil-air is transported from the oil-air supply device to the oil-air distribution structure through piping, and the oil-air distribution structure distributes the oil-air to be supplied to the bearing and the oil-air to be sent to the next object to be lubricated. In this case, it is necessary to provide piping for the distribution structure and space for arranging the distribution structure around the rolling equipment, which poses problems such as high installation costs for the distribution structure piping and the need to install the distribution structure. The problem is that it is difficult to secure space for

Furthermore, as in Patent Document 1, a structure has been proposed in which a distributor is inserted into a circular hole bored in a chock such as a bearing to distribute oil and air. In this case, since there is no need to provide piping outside the chock, a space-saving oil-air lubrication device can be realized. In the case of a lubricating device with such a structure, an elastic member such as an O-ring is installed around the outer circumference of the distributor to seal between the distributors to prevent oil leakage within the circular hole bored in the chock. be. Such a lubricating device is provided with an oil supply passage for the part to be lubricated, which is provided perpendicularly to the circular hole, and when the distributor is inserted into the circular hole, the elastic member is pressed by the edge of the oil supply passage. There is a problem in that it is damaged and sealing performance cannot be ensured. It is extremely difficult to chamfer the edges of the oil supply passage smoothly so as not to damage the elastic member. For this reason, it is difficult to prevent damage to the elastic member, and it is difficult to prevent oil/air leakage in the lubricating device.

Therefore, the present inventors studied an oil/air distributor and an oil/air distribution structure for solving these problems, and arrived at the following invention.

(Embodiment 1)
[overall structure]
1 is a perspective view of the oil/air distributor according to the first embodiment, FIG. 2 is a sectional view of the oil/air distributor of FIG. 1, and FIG. 3 is a sectional view of an oil/air distribution structure including the oil/air distributor of FIG. 1. be.

As shown in FIG. 1, the oil/air distributor 1 is composed of a plurality of parts. In this embodiment, the oil/air distributor 1 includes a distribution section 2, an outlet joint section 3, an inlet joint section 4, and an elastic member 5a. Note that the inlet joint portion 4 is not an essential configuration and may not necessarily be provided. The oil/air distributor 1 is a cartridge type oil/air distributor, and is used in the oil/air distribution structure 100 shown in FIG. 3.

As shown in FIG. 3, the oil/air distribution structure 100 distributes oil/air to an object 101 to be lubricated, such as a bearing of a rolling equipment, for example. The oil/air distribution structure 100 includes an oil/air distributor 1, a housing 102 that houses a lubrication target 101, an oil/air supply channel 103 through which oil/air flows, an oil/air branch channel 104 provided in the middle of the oil/air supply channel, and an oil/air branch channel 104 provided in the middle of the oil/air supply channel. A spacer pipe 105 disposed in the supply channel 103 is provided. Note that in FIG. 3, arrow X indicates the direction in which oil and air flow.

The oil/air distribution structure 100 is configured by inserting a plurality of parts including the oil/air distributor 1 into an oil/air supply channel 103 provided in a housing 102 that houses a lubrication target 101. For example, in this embodiment, the plurality of parts used include the oil/air distributor 1, the spacer pipe 105, the tip part 107, the holding part 108, the gasket 109, and the adapter 110. As shown in FIG. 3, the tip part 107, the oil/air distributor 1, the spacer pipe 105, the oil/air distributor 1, the spacer pipe 105, the holding part 108, the gasket 109, and the adapter 110 are inserted in this order into the oil/air supply channel 103. has been done. As shown in FIG. 3, in this embodiment, two oil/air distributors 1 and two spacer pipes 105 are used, but the types and number of parts used are not limited to those described above. Note that in this embodiment, there are two lubrication targets 101, but there may be three or more lubrication targets 101, and in that case, at least one less oil/air distributor than the number of lubrication targets 101 is required. It is.

<Oil air supply channel>
The oil/air supply channel 103 is, for example, a cylindrical hole formed in the housing 102. The oil/air distributor 1 and other parts described later are inserted into the oil/air supply channel 103. An oil/air branch channel 104 is provided in the middle of the oil/air supply channel 103 through which oil/air flows to the object 101 to be lubricated.

<Oil air distributor>
As shown in FIGS. 1 and 2, the oil/air distributor 1 has an outlet joint 3 connected to one end of a distribution section 2, and an inlet joint 4 connected to the other end. An elastic member 5a is fitted around the outer periphery of the end of the outlet joint portion 3.

<Distribution section>
The distribution section 2 of the oil/air distributor 1 is arranged at a branch section 106 where the oil/air supply channel 103 and the oil/air branch channel 104 are connected, and distributes the oil air flowing through the oil/air supply channel 103 to the oil/air branch channel 104. . The distribution section 2 may have a structure in which a sleeve 22 is inserted into a main body 21, for example, as shown in FIG. In the distribution part 2, an insertion hole 25 is provided inside the main body 21, and a groove 26 is formed so as to go around the outer periphery of the main body 21. Further, a through hole 27 is provided that communicates the distribution channel 22a of the sleeve 22 inserted into the main body 21 with the groove 26 on the outer periphery. By disposing the oil/air distributor 1 at the branch section 106 of the oil/air supply channel 103, the through hole 27 and the oil/air branch channel 104 are communicated with each other, and a portion of the oil/air that has flowed into the distribution section 2 from the inlet channel 42 is communicated with the through hole 27 and the oil/air branch channel 104. can be supplied to the object 101 to be lubricated via the distribution channel 22a and the through hole 27.

<Outlet joint>
The outlet joint section 3 is connected to the distribution section 2 on the downstream side of the branch section 106 in the oil/air supply channel 103 . As shown in FIG. 2, the end of the outlet joint part 3 is provided with a convex fitting part 31 for connecting with a spacer pipe 105, which will be described later. It is fitted. Furthermore, a protrusion 32 may be provided at the tip of the fitting portion 31 to prevent the elastic member 5a from falling off. The protrusion 32 is, for example, a flange-shaped protrusion provided at the tip of the insertion part 31. When the oil/air distributor 1 is inserted into or removed from the oil/air supply channel 103, the elastic member 5a is caught on the protrusion 32, thereby preventing the elastic member from falling off. The fitting portion 31 of the outlet joint portion 3 is fitted into a fitting portion 152 provided at the end of the spacer pipe 105, which will be described later. Furthermore, since the connecting portion 33 of the outlet joint portion 3 with the distribution portion 2 is inserted into the insertion hole 25 of the main body 21 of the distribution portion 2, its outer diameter is formed to match the diameter of the insertion hole 25. ing. The connecting portion 33 may be provided with an annular outlet-side elastic ring 34 formed of an O-ring or the like, for example. Further, an outlet passage 35 is formed inside the outlet joint part 3 through which the oil air flowing out from the distribution part 2 flows.

<Inlet joint>
The inlet joint portion 4 is connected to the distribution portion 2 on the upstream side of the branch portion 106 in the oil/air supply channel 103 . As shown in FIG. 2, a concave fitting portion 41 is formed at the end of the inlet joint portion 4 for connection to a spacer tube to be described later. The end surface 41a of the inserted part 41 of the inlet joint part 4 is inclined in a direction away from the spacer pipe 105 as it goes in the outer diameter direction of the inlet joint part 4. Furthermore, an inlet flow path 42 through which oil and air flow to the distribution section 2 is formed inside the inlet joint section 4 . Furthermore, since the connecting portion 43 of the inlet joint portion 4 with the distribution portion 2 is inserted into the insertion hole 25 of the main body 21 of the distribution portion 2, its outer diameter is formed to match the diameter of the insertion hole 25. ing. The connecting portion 43 may be provided with an annular entrance-side elastic ring 44 formed of, for example, an O-ring.

<Spacer tube>
The spacer pipe 105 is arranged in the oil-air supply channel 103, is connected to at least one of the inlet joint part 4 and the outlet joint part 3 of the oil-air distributor, and has one end connected to the inlet joint part 4 side. It has an elastic member 5b. As shown in FIG. 4(a), which will be described later, a convex fitting part 151 for connecting to the inlet joint part 4 is provided at one end of the spacer tube 105. The elastic member 5b is fitted onto the outside. Furthermore, a protrusion (not shown) may be provided at the tip of the fitting portion 151 to prevent the elastic member 5b from falling off. The spacer pipe 105 and the inlet joint part 4 are connected by fitting the fitting part 151 of the spacer pipe 105 into the fitted part 41 of the inlet joint part 4 . At this time, the elastic member 5b is sandwiched between the fitting part 151 of the spacer tube 105 and the fitting part 41 of the inlet joint part 4 (see FIG. 4(b)).

Furthermore, a recessed fitting portion 152 is formed at the other end of the spacer tube 105 . The fitting portion 31 of the outlet joint portion 3 is fitted into the fitting portion 152 of the spacer tube 105, thereby connecting the outlet joint portion 3 and the spacer tube 105. At this time, the elastic member 5a is sandwiched between the fitting part 31 of the outlet joint part 3 and the fitting part 152 of the spacer tube 105 (see FIG. 4(b)). Further, the end surface 152a of the inserted portion 152 of the spacer tube 105 is inclined in a direction away from the outlet joint portion 3 as it goes in the outer diameter direction of the spacer tube.

The fitting portion 31 of the outlet joint portion 3 and the fitting portion 151 of the spacer tube 105 may have the same shape, and the fitting portion 41 of the inlet fitting portion 4 and the fitting portion 152 of the spacer tube 105 may have the same shape. It may be. In this way, for example, two oil/air distributors 1 can be directly connected without using the spacer pipe 105.

<Elastic member>
When the elastic member 5a is compressed by a force in the thickness direction, its outer diameter becomes larger than the outer diameter of the outlet joint portion 3, and the elastic member 5a becomes attached to the inner wall 103a (see FIG. 2) that defines the oil/air supply channel 103. They come into close contact and seal between the inner wall 103a and the end of the outlet joint part 3. The elastic member 5b is compressed by a force in the thickness direction, so that its outer diameter becomes larger than the outer diameter of the inlet joint part 4 and comes into close contact with the inner wall 103a, so that the inner wall 103a and the end of the inlet joint part 4 are connected to each other. Seal between. For example, O-rings made of fluororubber (FKM) can be used as the elastic members 5a and 5b. Further, the elastic members 5a and 5b may be made of a general elastic material such as nitrile rubber (NBR), styrene-butadiene rubber (SBR), or silicone rubber (VMQ).

Here, a mechanism for sealing the ends of the outlet joint part 3 and the inlet joint part 4 and the inner wall 103a of the oil/air supply channel 103 using the elastic members 5a and 5b will be described with reference to FIG. 4. FIG. 4 is a diagram showing a change in the outer diameter of the elastic members 5a and 5b due to receiving force in the thickness direction. As shown in FIG. 4(a), the outer diameter da of the elastic members 5a and 5b when no force is applied to the elastic members 5a and 5b is the outer diameter d1 of the outlet joint part 3 and the inlet joint part 4, and the oil air It is smaller than the inner diameter d2 (see FIG. 3) of the supply channel 103. In this embodiment, the outer diameter d1 of the outlet joint part 3 and the inlet joint part 4, that is, the outer diameter d1 of the oil-air distributor 1 and the spacer pipe 105, is 25.0 mm, and the inner diameter d2 of the oil-air supply channel 103 is 25.0 mm. It is 2mm. Further, the elastic members 5a and 5b are constituted by G19 type O-rings, and have an outer diameter da of approximately 24.6 mm when not receiving force. The spacer pipe 105, the oil/air distributor 1, and other parts are inserted into the oil/air supply flow path 103, and the elastic members 5a, 5b are When a force in the thickness direction is applied to the elastic members 5a and 5b, the elastic members 5a and 5b are compressed in the thickness direction. At this time, as shown in FIG. 4(b), the outer diameter db of the elastic members 5a and 5b becomes larger than the outer diameter d1 of the outlet joint part 3 and the inlet joint part 4. In this way, the outer diameter db is larger than the outer diameter d1 of the outlet joint part 3 and the inlet joint part 4, so that the outer diameter db of the outlet joint part 3 and the inlet joint part 4 is in close contact with the inner wall 103a of the oil/air supply channel 103. It is possible to seal between the end portion and the inner wall 103a defining the oil/air supply channel 103.

Further, when O-rings are used as the elastic members 5a and 5b, the allowable compression rate of O-rings is generally 30%, so it is preferable that the compression rate is within 30%. In this embodiment, the wire diameter of the G19 type O-ring constituting the elastic members 5a and 5b is 3.1 mm, and the groove depth w is 2.45 mm, so the compression ratio in the thickness direction is approximately 21 mm. %. Further, since the inner diameter of the inner wall 103a of the oil/air supply channel 103 is 25.2 mm, and the outer diameter db of the elastic members 5a and 5b when subjected to force in the thickness direction is approximately 25.6 mm, the elastic member 5a, The radial compression ratio of the inner wall 103a of the inner wall 5b is approximately 6.5%. Therefore, the total compression ratio of the elastic members 5a and 5b is approximately 27.5%.

In addition, in this embodiment, in order to prevent the elastic members 5a and 5b from being damaged when the oil-air distributor 1 is inserted into or removed from the oil-air supply channel 103, it is necessary to , 5b preferably has an outer diameter da of 24.9 mm or less. Furthermore, in order to reliably seal the outlet joint part 3 and the inlet joint part 4 in the oil-air supply channel 103, the outer diameter db of the elastic members 5a and 5b when subjected to force should be 25.5 mm or more. good.

As shown in FIG. 4, by fitting the fitting part 31 of the outlet joint part 3 into the fitting part 152 of the spacer tube 105, the convex surface 31a of the fitting part 31 and the concave surface 152b of the fitting part 152 come into contact. Similarly, by fitting the fitting portion 151 of the spacer tube 105 into the fitting portion 41 of the inlet joint portion 4, the convex surface 151a of the fitting portion 151 and the concave surface 41b of the fitting portion 41 come into contact. As described above, since the fitting parts 31, 151 and the fitting parts 152, 41 have a spigot structure, the positioning when connecting the outlet joint part 3 and the spacer pipe 105, and the spacer pipe 105 and the inlet joint part 4 is possible. becomes easier.

Moreover, such a spigot structure allows the force received by the elastic members 5a and 5b to be maintained at a constant value. By preventing unnecessarily large force from being applied to the elastic members 5a, 5b, damage to the elastic members 5a, 5b can be prevented.

Furthermore, the inclination of the end surfaces 152a, 41a of the fitted portions 152, 41 makes it easier for the elastic members 5a, 5b to expand in the outer radial direction of the outlet joint portion 3 and the spacer tube 105, so that sealing performance can be improved.

[motion]
The sealing operation by the elastic member of the oil/air distribution structure having the above-mentioned configuration will be explained.

(1) Insert the tip part 107, the oil/air distributor 1, the spacer pipe 105, the oil/air distributor 1, the spacer pipe 105, the holding part 108, the gasket 109, and the adapter 110 into the oil/air supply channel 103 in this order. At this time, the outer diameters of the elastic members 5a and 5b are smaller than the outer diameter of the oil/air distributor 1.

(2) Apply force in the direction of oil/air flow using a cap screw, etc.

(3) The elastic members 5a and 5b receive force in the thickness direction and are compressed.

(4) The elastic members 5a and 5b compressed in the thickness direction have larger outer diameters, and are brought into close contact with the inner wall 103a of the oil-air supply channel 103 to connect the outlet joint 3, the inlet joint 4, and the oil-air supply channel 103. A seal is formed between the inner wall 103a and the inner wall 103a.

[effect]
According to the oil/air distributor 1 and the oil/air distribution structure 100 of the present invention, when the oil/air distributor 1 is inserted into the oil/air supply channel 103 provided in the housing 102, the outer diameter of the elastic members 5a, 5b Smaller than vessel 1. Therefore, contact of the elastic members 5a, 5b with the inner wall 103a of the oil/air supply channel 103 and the edge of the oil/air branch channel 104 can be suppressed, thereby preventing damage to the elastic members 5a, 5b and improving sealing performance. An improved oil/air distributor 1 can be provided. Further, after the oil/air distributor 1 is inserted into the oil/air supply channel 103, the elastic members 5a, 5b are compressed by receiving force in the thickness direction and the outer diameter becomes larger, so that sealing performance is improved. Furthermore, when the sealing performance is improved, oil and air can be accurately distributed to the object 101 to be lubricated.

Further, since the elastic members 5a, 5b are O-rings made of fluororubber, the heat resistance of the elastic members 5a, 5b can be improved.

Furthermore, since the protrusion 32 is formed in the fitting part 31 of the outlet joint part 3, the elastic member 5a fitted externally into the fitting part 31 of the outlet joint part 3 is connected to the oil-air supply channel 103 of the oil-air distributor 1. This prevents the device from falling off when inserted into or removed from the device.

Further, the concave fitting portion 31 provided at the end of the outlet joint portion 3 is fitted into the fitting portion 152 provided at the end of the spacer tube 105, so that the outlet joint portion 3 and the spacer tube 105 are connected to each other. Since the outlet joint part 3 and the spacer pipe 105 are connected to each other, positioning when connecting the outlet joint part 3 and the spacer pipe 105 is easy. Further, since the force applied to the elastic member 5a becomes constant, damage to the elastic member 5a can be prevented. Furthermore, since the end surface 152a of the fitted portion 152 is inclined, the elastic member 5a can easily spread in the outer diameter direction of the spacer tube 105, and the sealing performance can be further improved.

Note that in the first embodiment, the inner diameter of the oil-air supply flow path 103 and the outer diameter of the oil-air distributor 1 are described, but the diameter size is not limited to this and may vary depending on the size of the parts to be lubricated, the housing, etc. It is possible to change.

In addition, in the first embodiment, the distribution section 2 is composed of a plurality of parts, but the shape of the distribution section 2 is not limited to this. Any structure is fine.

Further, in the first embodiment, the protrusion 32 of the outlet joint portion 3 is formed in a flange shape, but the shape is not limited to this as long as the shape prevents the elastic member 5a from falling off.

The oil-air distributor and oil-air distribution structure of the present invention can be widely used in oil-air lubrication devices.

1 Oil-air distributor 2 Distribution part 3 Outlet joint part 4 Inlet joint part 5a Elastic member (first elastic member)
5b Elastic member (second elastic member)
31 Fitting part 32 Projection part 41 Fitting part
41a End face
100 Oil-air distribution structure 101 Lubricating object 102 Housing 103 Oil-air supply channel 104 Oil-air branch channel 105 Spacer pipe 106 Branch part
107 Tip parts
151 Fitting part 152 Fitting part
152a end face

Claims (6)

It can be placed in an oil-air supply channel provided in a housing that houses a lubrication target, and distributes oil-air from the oil-air supply channel to an oil-air branch channel provided in the middle of the oil-air supply channel. A cartridge type oil/air distributor,
a distribution unit disposed at a branching portion where the oil-air supply channel and the oil-air branch channel are connected, and distributing the oil air flowing through the oil-air supply channel to the oil-air branch channel;
an outlet joint part connected to the distribution part on the downstream side of the branch part in the oil-air supply flow path, the outlet joint part having one end and the other end, the one end being connected to the distribution part; an outlet joint portion having a cylindrical first connecting portion to be connected and a convex fitting portion provided at the other end of the first connecting portion ;
an annular first elastic member fitted around the outer periphery of the fitting part of the outlet joint part;
Equipped with
The fitting part of the outlet joint part has a second outer diameter smaller than the first outer diameter of the part of the first connecting part of the outlet joint part on the fitting part side,
The first elastic member is
having an outer diameter smaller than the first outer diameter when no force is applied in the thickness direction of the first elastic member;
When the first elastic member is compressed by a force in the thickness direction, the outer diameter becomes larger than the first outer diameter of the outlet joint, and the first elastic member is tightly attached to the inner wall defining the oil/air supply flow path. and sealing between the inner wall and the end of the outlet joint,
A projection for preventing the first elastic member from falling off is provided on the outer circumferential surface of the end of the insertion portion of the outlet joint.
Oil air distributor. The oil/air distributor according to claim 1, wherein the first elastic member is an O-ring. The oil/air distributor according to claim 1 or 2;
the housing that houses the object to be lubricated;
the oil air supply channel through which the oil air flows;
the oil/air branch flow path provided in the middle of the oil/air supply flow path;
one or more spacer pipes disposed within the oil-air supply flow path;
Equipped with
The oil/air distributor further includes an inlet joint part connected to the distribution part on an upstream side of the branch part in the oil/air supply flow path,
The one or more spacer tubes are connectable to the inlet fitting at one end, connectable to the outlet fitting at the other end, and are fitted onto the one end. having a second elastic member;
the one or more spacer tubes include a first spacer tube having the other end connected to the outlet fitting;
the first elastic member is compressed by the outlet joint and the first spacer tube;
Oil air distribution structure. A concave fitting portion is provided at the other end of the one or more spacer tubes,
The fitting part of the outlet joint part is fitted into the fitted part of the first spacer pipe, whereby the outlet joint part and the first spacer pipe are connected, and the outlet joint part is connected to the first spacer pipe. the first elastic member is sandwiched between the outlet joint portion and the first spacer tube,
An end surface of the fitted portion of the first spacer pipe that contacts the first elastic member of the outlet joint part is inclined in a direction away from the outlet joint part as it goes in an outer diameter direction of the first spacer pipe. The oil/air distribution structure according to claim 3. A convex fitting part is provided at the one end of the one or more spacer tubes,
The inlet joint part has a cylindrical shape having one end and the other end, the one end being connected to the distribution part, and the other end being connected to the fitting part of the spacer pipe. having a second connection part of;
The fitting portion of the one or more spacer tubes has a fourth outer diameter smaller than the third outer diameter of a portion of the spacer tube on the fitting portion side at the second connection portion of the inlet joint portion. ,
the second elastic member is externally fitted into the fitting part of the spacer tube,
the one or more spacer tubes include a second spacer tube having one end connected to the inlet fitting;
The second elastic member is
The second elastic member has an outer diameter smaller than a third outer diameter of the inlet joint portion when no force is applied in the thickness direction of the second elastic member;
When the second elastic member is compressed by a force in the thickness direction, its outer diameter becomes larger than the third outer diameter, and it comes into close contact with the inner wall, thereby forming a connection between the inner wall and the end of the inlet joint. seal between
The oil/air distribution structure according to claim 3 or 4. A concave fitting part is provided at the end of the inlet joint part,
The fitting part of the second spacer pipe is fitted into the fitted part of the inlet joint part, thereby connecting the second spacer pipe and the inlet joint part, and connecting the second spacer pipe to the inlet joint part. the second elastic member of the spacer tube is sandwiched between the second spacer tube and the inlet joint;
An end surface of the inserted portion of the inlet joint portion that contacts the second elastic member of the second spacer tube is inclined in a direction away from the spacer tube as it goes in an outer radial direction of the inlet joint portion. The oil/air distribution structure according to claim 5.

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