JP2005291280A - Machine parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of electroerosion in a section where different types of metal of parts for a vehicle or the like are connected to provide a machine part having excellent reliability and durability. <P>SOLUTION: This machine part has a piping member 20 and a part 10 connecting the piping member 20. The piping member 20 and the part 10 are made of different kinds of metal. This machine part is provided with a shielding means 40 covering a section where the piping member 20 and the part 10 abut and having electrical insulation property for shutting off from outside air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a machine part, and more particularly to a machine part including a pipe member used in a vehicle part and the like and a part for connecting the pipe member.

  Many machine parts, for example, vehicle parts, are configured by combining various parts such as vehicle disk brakes, master cylinders, and ABS modulators. Especially, pipe parts such as pipes are connected. There are many mechanical parts to be assembled. Of these mechanical parts, piping members, such as flare pipes, are generally made of an iron-based material, so parts such as a master cylinder or caliper body to which the piping members are connected are made of, for example, an aluminum alloy. In some cases, galvanic action may occur due to the contact of dissimilar metals between these piping members and parts made of an aluminum alloy.

As a method for preventing the galvanic action between different metals, there is a method of interposing an galvanic corrosion prevention member such as an insulating washer at the part where the different metal contacts, or the surface of the member contacting the different metal, A method (for example, refer to Patent Document 1) in which a treatment, for example, a zinc chromic acid polymerized film is applied (dacro treatment) is known.
JP 2002-323073 A

  By the way, in many cases, the vehicle parts are arranged so as to be exposed to the outside, such as a vehicle disk brake, or are arranged at a place where outside air, water, foreign matter, etc. easily enter. Therefore, in mechanical parts installed in such an environment, water or outside air is likely to enter the parts where members made of different metals come into contact with each other. There was a problem that galvanic action was likely to occur.

  The present invention has been made to solve these problems, and the object of the present invention is to connect and connect these members when the piping member and the parts connecting the piping members are made of different metals. Therefore, it is possible to suppress the occurrence of the electrolytic corrosion action at a place to be provided, and to provide it as a durable and reliable machine part.

In order to achieve the above object, the present invention comprises the following arrangement.
That is, a mechanical component having a piping member and a component for connecting the piping member, wherein the piping member and the component are made of different metals, covering a portion where the piping member and the component abut, It is characterized by comprising shielding means having electrical insulation that shields from outside air.

The part has a conical threaded hole at the bottom, and the piping member is fixed to the bottom of the threaded hole by abutting the end surface of the piping member with the threaded portion, and the end surface of the piping member and the screw The bottom of the hole is in liquid-tight contact.
Also, one of the bottom of the screw hole or the end surface of the piping member is formed as a convex taper surface, and the other is formed as a concave taper surface, so that the piping member and the component are more securely connected in a liquid-tight manner. it can.
In addition, since the shielding means is a cylindrical detachable elastic cover, it is possible to easily cover a portion where the piping member and the component are in contact with each other and to shield from the outside air.
In addition, since the flange portion for locking the elastic cover is provided on the piping member side or the component side, the elastic cover can be prevented from being detached and securely attached. In addition, it has a cylindrical sealing material having an annular convex part or an annular concave part on the outer periphery of the side part, and has a cylindrical sealing material between the flange part of the piping member and the component. One end covers the flange portion of the screw portion, and the other end covers the annular convex portion, or is closely fitted to the annular concave portion. . Thereby, the contact part of a piping member and components can be sealed more reliably.

  In the mechanical component according to the present invention, the portion where the piping member and the component connecting the piping member abut can be shielded from the outside air by using a shielding means, and thereby, between the piping member and the component which are different metals. Therefore, it is possible to suppress the occurrence of the electrolytic corrosion action, and it is possible to improve the durability and reliability of the mechanical parts.

  1 to 3 show examples of mechanical parts in which a flare pipe 20 as a piping member is connected to a modulator of an antilock brake as an embodiment of the present invention. This modulator is provided with a connection port 12 for connecting a piping member to be an input oil passage and a connection port 14 for connecting a piping member to be an output oil passage to a modulator body 10 made of, for example, an aluminum alloy. A housing 16 containing a control member for controlling the modulator is mounted on one side surface of the modulator body 10, and an electric motor 18 is mounted on the other side surface of the modulator body 10.

  FIG. 1 shows how the flare pipe 20 is connected using a connector 30 from above the connection port 14 provided on the upper surface of the modulator body 10. At the end of the flare pipe 20 on the connection side to the connection port 14, a flange-shaped projecting portion 22 is provided that is formed to have a diameter slightly larger than the pipe diameter of the flare pipe 20. As shown in the figure, the flare pipe 20 is fixed to the connection port 14 by screwing with the connector 30 with the end portion inserted into the connection port 14 and the projecting portion 22 abutting against the bottom of the connection port 14. Is done.

  FIG. 2 shows a state in which the flare pipe 20 is connected to the connection port 14 of the modulator body 10. The connection port 14 is formed in a screw hole with which the protruding portion 22 of the flare pipe 20 abuts at the bottom, and the flare pipe 20 is fixed to the modulator body 10 by screwing the connector 30 into the screw hole of the connection port 14.

FIG. 4 shows a configuration of the flare pipe 20 and the connector 30 and a configuration in a state where the flare pipe 20 is connected to the connection port 14 of the modulator body 10.
As shown in FIG. 4 (a), the contact surface 22a that contacts the bottom portion 14a of the connection port 14 of the projecting peripheral portion 22 provided at the end of the flare pipe 20 is formed into a tapered surface.
Further, the connector 30 is provided with an insertion hole 32 that penetrates in the axial direction and passes through the flare pipe 20, and the end surface 30 a of the screw portion 33 that faces the rear surface of the projecting peripheral portion 22 contacts the rear surface of the projecting peripheral portion 22. It is formed in the taper surface which touches.

As shown in FIG. 4 (b), the flare pipe 20 abuts the contact surface 22 a of the projecting peripheral portion 22 against the bottom portion 14 a of the connection port 14, and screws the connector 30 into the screw hole 14 b of the connection port 14. The end face 30a is brought into contact with the rear surface of the projecting peripheral portion 22, and the projecting peripheral portion 22 is screwed in a state of abutting against the bottom portion 14a of the connection port 14, thereby being connected to the modulator body 10 in a liquid-tight manner.
In the present embodiment, the bottom portion 14a of the screw hole 14b is formed in a conical shape in which the surface with which the projecting portion 22 of the flare pipe 20 contacts is a concave tapered surface, and the contact surface 22a of the projecting portion 22 of the flare pipe 20 is formed. Is a convex taper surface, and the end surface 30a of the threaded portion 33 of the connector 30 is also a convex taper surface, so that the projecting peripheral portion 22 is surely pressed against the concave taper surface of the bottom portion 14a. Thus, the flare pipe 20 and the flow path 11 formed inside the modulator body 10 communicate with each other.

FIG. 3 shows a state in which after the flare pipe 20 is connected to the modulator body 10, a shielding means, for example, an elastic cover 40 is attached so as to cover the connection portion between the flare pipe 20 and the modulator body 10. As shown in FIGS. 1 and 2, the elastic cover 40 can be mounted so as to be externally attached to the flare pipe 20 from above the connector 30. In the present embodiment, the elastic cover 40 is mounted so that the connector 30 protruding from the modulator body 10 and the connection port 14 are shielded from the outside.
The elastic cover 40 has an electrical insulating property such as insulating rubber or insulating resin, and is formed of a material having stretchability and flexibility. The shape of the elastic cover 40 is not particularly limited. For example, the elastic cover 40 is formed in a cylindrical shape (tube shape) using an insulating material, and is elastically adhered to the outer peripheral surface of the connector 30 using the contraction force of the elastic cover 40. It can be installed in such a way.

  FIG. 5 is an enlarged cross-sectional view illustrating a state in which the elastic cover 40 is mounted so as to cover the contact portion between the connector 30 protruding from the modulator body 10 and the connection port 14. The elastic cover 40 is in close contact with the outer peripheral surface of the flare pipe 20 on the upper side of the head portion 34, and water or outside air is formed between the insertion hole of the connector 30 and the outer peripheral surface of the flare pipe 20 between the flare pipe 20 and the modulator body 10. Protects against entry into the connection. At the lower part of the elastic cover 40, the lower end edge of the elastic cover 40 is in close contact with the upper surface of the modulator body 10 so that water or outside air enters the connection port 14 from the surface of the modulator body 10, or the connector 30. This prevents water or the like from entering the threaded portion 33 of the. Since the head portion 34 of the connector 30 is larger in diameter than the screw portion 33, the elastic cover 40 is prevented from coming off so as not to be detached from the connector 30.

  As described above, since the flare pipe 20 is made of an iron-based material and the modulator body 10 is made of an aluminum alloy, the connector 30 and the connection port 14 exposed to the outside from the modulator body 10 are covered with the elastic cover 40. The abutting portion between the flare pipe 20 and the modulator body 10 is shielded from the outside, and water or outside air is prevented from entering the abutting portion through the connection port 14 or the connector 30 from the outside. It is possible to suppress the occurrence of electrolytic corrosion at the part.

FIG. 6 shows another connection form of the connecting portion between the flare pipe 20 and the modulator body 10 in a mechanical component in which the flare pipe 20 is connected to the modulator body 10.
That is, in the connection form shown in FIG. 6, the contact surface 22a of the projecting portion 22 that contacts the bottom portion 14a of the threaded hole 14b of the flare pipe 20 is a concave tapered surface, and the bottom portion 14a of the screw hole 14b is a convex tapered surface. The flare pipe 20 is connected to the modulator body 10.
In this case, the end surface 30a of the connector 30 threaded portion 33 is formed in a concave taper surface in the same manner as the contact surface 22a of the protruding portion 22 in order to press the rear surface of the protruding portion 22 against the bottom portion 14a.

  Also in this connection form, by attaching the elastic cover 40 so as to cover the connector 30 protruding from the modulator body 10 and the connection port 14, the contact portion between the flare pipe 20, which is a dissimilar metal, and the modulator body 10. That is, the portion where the projecting peripheral portion 22 of the flare pipe 20 and the bottom portion 14a of the screw hole 14b are in contact is shielded from the outside, so that water or outside air can be prevented from entering the contact portion from the outside. Thereby, it is possible to suppress the occurrence of galvanic action at the portion where the flare pipe 20 and the modulator body 10 abut.

  FIG. 7 shows a configuration in which a connector-integrated pipe 25 made of an iron-based material is connected to a modulator body 10 made of an aluminum alloy as a connection form between the piping member and the parts in the mechanical component according to the present invention. The pipe 25 of this embodiment is provided with a connector portion 26 integrally with the pipe body 24 on the connection end side to the modulator body 10. Similarly to the connection form described above, the connector portion 26 is formed with a screw portion 26b that is screwed into the screw portion 14b provided in the head portion 26a and the modulator body 10. The end surface of the screw portion 26b is planar.

As shown in the figure, the connector-integrated pipe 25 is formed by screwing the screw portion 26b of the connector portion 26 into the screw hole 14b of the modulator body 10, so that the end surface of the screw portion 26b is formed into a concave tapered surface of the screw hole 14b. The pipe 25 is connected to the modulator body 10 in a liquid-tight manner in contact with the bottom 14a.
Also in the connection form of the present embodiment, the connector part 26 protruding from the modulator body 10 and the connection port 14 are covered with the elastic cover 40, so that the bottom part 14a of the screw hole 14b and the end face of the screw part 26b of the connector part 26 It is possible to shield the part where the abuts from the outside.

  In the case where the connector-integrated pipe 25 is connected to the modulator body 10, the contact portion between the pipe 25 and the modulator body 10 corresponds to the screw portion 26b of the connector portion 26 and the bottom portion 14a of the screw hole 14b. The contact portion, the screw portion 26b of the connector portion 26, and the screw hole 14b are screwed. Even in this case, as shown in FIG. 7, the contact portion (contact portion) between the pipe 25 and the modulator body 10 is shielded from the outside by the elastic cover 40, and therefore, the electrolytic corrosion action at these contact portions (contact portion). Can be suppressed.

  FIG. 8 shows another connection form between the flare pipe 20 and the modulator body 10. FIG. 8A shows an example in which a portion where the connection port 14 is provided in the modulator body 10 is formed as a protruding portion 13 having substantially the same diameter as the head portion 34 of the connector 30 and protruding from the outer surface of the modulator body 10. By connecting the flare pipe 20 to the modulator body 10 and attaching the elastic cover 40 so as to cover the outer surface of the protrusion 13 and the connector 30, it is possible to more reliably prevent intrusion of water and outside air from the connection port 14 side. Can do. In addition, the elastic cover 40 expands and contracts at a portion straddling the head portion 34 and the protruding portion 13, and the elastic cover 40 is prevented from coming off.

  FIG. 8B shows an example in which a flange 13 a is further provided on the protrusion 13 and the elastic cover 40 is attached from the upper surface of the head 34 to the flange 13 a. In this example, since the outer surface of the flange portion 13a is covered on the lower edge side of the elastic cover 40, the elastic cover 40 is locked to both the head portion 34 and the flange portion 13a, and the shielding action by the elastic cover 40 is further increased. It will be certain.

FIG. 9 shows still another connection configuration in which the flare pipe 20 is connected to the modulator body 10.
In the present embodiment, when the flare pipe 20 is connected to the modulator body 10 by the connector 30, the cylindrical sealing material 42 is extrapolated to the screw portion 33 of the connector 30, and when the connector 30 is screwed into the screw hole of the connection port 14, The flare pipe 20 is connected to the modulator body 10 by compressing the cylindrical sealing material 42 between the head portion 34 of the connector 30 and the surface of the modulator body 10.

  The cylindrical sealing material 42 is a cylindrical member provided with an insertion hole through which the threaded portion 33 of the connector 30 is inserted, and has an electrically insulating property such as an insulating rubber or an insulating resin, and has elasticity. Formed by. The cylindrical sealing material 42 of the embodiment forms a large diameter portion 42 a on the side of the connector 30 that contacts the head portion 34, and after the connector 30 is screwed, the elastic cover 40 is placed between the large diameter portion 42 a and the head portion 34. I covered it over. By providing the large diameter portion 42a, the contact area between the head portion 34 and the cylindrical sealing material 42 can be increased, and the sealing performance at the end surfaces of the head portion 34 and the cylindrical sealing material 42 can be improved. There is also an effect that the elastic cover 40 is prevented from coming off by engaging the lower edge side of the elastic cover 40 with 42a.

  As described above, the cylindrical sealing material 42 is attached between the head portion 34 of the connector 30 and the surface of the modulator body 10 so as to be compressed, so that the cylindrical sealing material 42 is attached to the head portion 34 of the connector 30 and the modulator body 10. It is possible to prevent water and outside air from entering the inner region surrounded by the cylindrical sealing material 42 from the outside.

  Further, by attaching the elastic cover 40 together with the cylindrical sealing material 42, it is possible to prevent water and outside air from entering the inside of the modulator body 10 through the connector 30 and the connection port 14 exposed from the modulator body 10 to the outside. It is possible to prevent the contact portion between the flare pipe 20 and the modulator body 10 from water and outside air, and to prevent the occurrence of galvanic action at these contact portions. Become. In this embodiment, it is also possible to configure so as to obtain a sealing action only with the cylindrical sealing material 42 without using the elastic cover 40. Further, in the cylindrical sealing material 42 shown in FIG. 9, the large-diameter portion 42a is provided on the outer peripheral surface thereof, but an annular protrusion or an annular recess may be provided on the outer peripheral surface of the cylindrical sealing material 42 instead of the large-diameter portion 42a. Good.

In the above-described embodiment, an example in which the flare pipe 20 or the connector-integrated pipe 25 is connected to the modulator body 10 as a piping member has been described. However, the present invention is not limited to these connecting portions, and the master cylinder and caliper body are also included. In addition to vehicle parts and piping members such as the above, the present invention can be similarly applied to a connection portion with a machine part including general piping members and parts. The part where the piping member and the part made of different metals contact at the connection part between these piping members and the part is shielded by a shielding means such as an elastic cover, and water or outside air enters the part where the different metal contacts. By preventing this, it is possible to suppress the occurrence of galvanic action at the site where the piping member made of a different metal and the component come into contact with each other.
In addition, the shape of the member to be used may be different depending on the connection part between the piping member and the part, or the connection method may be different. What is necessary is just to shield the site | part which abuts (contacts) from the outside.

It is a perspective view of the state before connecting a flare pipe to a modulator body. It is a perspective view in the state where a flare pipe was connected to a modulator body. It is a perspective view of the state where the portion of the connector exposed from the modulator body was covered with an elastic cover. It is explanatory drawing which shows the structure of the connection part of a flare pipe and a modulator body. It is sectional drawing which shows the example of a connection form of a flare pipe and a modulator body. It is sectional drawing which shows the example of a connection form of a flare pipe and a modulator body. It is sectional drawing which shows the example of a connection form of a modulator body and a connector integrated pipe. It is explanatory drawing which shows the example of a connection form of a flare pipe and a modulator body. It is explanatory drawing which shows the example of a connection form of a flare pipe and a modulator body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Modulator body 11 Flow path 13 Protrusion part 14 Connection port 14a Bottom part 14b Screw hole 16 Housing 20 Flare pipe 22 Projection part 22a Abutting surface 24 Pipe main body 25 Pipe 26 Connector part 26a Head part 26b Screw part 30 Connector 30a End surface 32 Insertion Hole 33 Screw part 34 Head part 40 Elastic cover 42 Cylindrical seal material 42a Large diameter part

Claims (6)

It is a mechanical component having a piping member and a component for connecting the piping member, and the piping member and the component are made of different metals,
A mechanical component comprising a shielding means that covers an area where the piping member and the component are in contact with each other, and has an electrical insulating property to block from the outside air. The part has a screw hole with a conical bottom.
The piping member is fixed to the bottom of the screw hole by abutting the end surface of the piping member with the screw portion,
The machine part according to claim 1, wherein an end face of the piping member and a bottom portion of the screw hole are in liquid-tight contact.   3. The machine part according to claim 2, wherein one of a bottom portion of the screw hole or an end surface of the piping member is formed as a convex taper surface, and the other is formed as a concave taper surface.   The machine part according to any one of claims 1 to 3, wherein the shielding means is a cylindrical detachable elastic cover.   The machine part according to claim 4, wherein a flange portion for locking the elastic cover is provided on the piping member side or the component side. A cylindrical sealing material having an insertion hole for the screw part and an annular convex part or an annular concave part on the outer periphery of the side part,
The cylindrical sealing material is elastically and contracted between the flange portion of the piping member and the component,
6. The mechanical part according to claim 5, wherein one end of the elastic cover covers the flange portion of the screw portion, and the other end covers the annular convex portion, or is closely fitted to the annular concave portion.

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