JP2007176229A - Grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grommet capable of preventing the tip side of an elastic claw piece from being opened outward, and keeping an excellent engagement state of an engagement projecting part formed on the elastic claw piece with the inner circumferential edge of an opening even if a load is applied in a disassembling direction by fitting the grommet to an opening of a wall, being connected thereto via a grommet body pipe, and filling a working fluid in a master cylinder, a slave cylinder and the pipe. <P>SOLUTION: The grommet 50 comprises a grommet body 53 and an inner member 54. The grommet body 50 has a flat plate 53a and a circumferential groove 53d. The inner member 54 has a frame body 54a, a flange 54b, and engagement parts 54c. The engagement parts 54c are formed on an elastic claw piece 54d, an engagement projecting part 54f which is formed on the base end side of the elastic claw piece 54d and engaged with the inner circumferential edge of an opening 42a, and claw piece reception holes 54e which are formed at the frame body 54a and the flange 54b to receive the elastic claw piece 54d in a deformable manner so as to bring the tip outer face of the elastic claw piece 54d into contact with the inner face of the claw piece reception hole 54e. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a grommet that is attached to a wall section that partitions a vehicle compartment and an engine room, and more particularly to a grommet that includes a grommet body formed of an elastic member and an inner member formed of a synthetic resin.

The grommet that is fixed in a fitted state to the opening formed in the wall portion is composed of a grommet main body formed of an elastic member such as a rubber material and an inner member formed of a synthetic resin. Some of them are engaged so that the grommet is attached to the opening, so that the attachment to and removal from the opening is facilitated. The inner member includes a frame body having a shape along the inner periphery of the opening, a flange portion fitted to the grommet body, and a plurality of engaging portions that engage with the inner peripheral edge of the opening, The engaging portion includes an elastic claw piece extending from an end portion of the frame body on the side opposite to the grommet main body, an engagement protrusion provided on a proximal end side of the elastic claw piece, and engaging with an inner peripheral edge of the opening. And a free groove formed in the flange portion, and the distal end side of the elastic claw piece is accommodated in the free groove so as to be deformable (see, for example, Patent Document 1).
Utility Model Registration No. 2607585

  However, in the above-described one, when a load is applied in the pulling direction of the grommet body after the grommet is attached to the opening of the wall portion, the distal end side of the elastic claw piece is deformed so as to open outward. There was a possibility that high stress was generated and the synthetic resin deteriorated.

  Therefore, the present invention has a simple structure, and after the grommet is attached to the opening of the wall portion, even if a load is applied in the pulling direction of the grommet body, the tip end side of the elastic claw piece is prevented from opening outward, and the elastic claw piece It is an object of the present invention to provide a grommet capable of maintaining a good engagement state between the engaging protrusion formed on the inner surface and the inner peripheral edge of the opening.

  In order to achieve the above object, according to the first aspect of the present invention, in the grommet attached to the opening formed in the wall portion that partitions the vehicle compartment and the engine room, the grommet is formed of an elastic member that closes the opening. The grommet body includes an inner member formed of a synthetic resin that engages with the inner peripheral side of the grommet body, and the grommet body covers the opening and closes the opening; and the inner member And the inner member is formed on a frame body having a shape along the inner periphery of the opening and a grommet body side end surface of the frame body, and is fitted into the circumferential groove. A flange portion, and a plurality of engagement portions that engage with the inner peripheral edge of the opening, the engagement portion including an elastic claw piece extending from an end portion of the frame body opposite to the grommet body, and the elastic portion Provided on the base end side of the nail piece, An engagement protrusion that engages with a peripheral edge, a claw piece receiving hole that is formed over the frame body and the flange portion and accommodates the elastic claw piece in a deformable manner, and includes a distal end side of the elastic claw piece The outer surface and a part of the inner surface of the claw piece receiving hole are connected in advance by a detachable thin portion.

  In the second invention, the grommet is assembled in a state in which the master cylinder and the slave cylinder arranged with the wall portion interposed therebetween are connected by piping, and the master cylinder, the slave cylinder, and the piping are filled with hydraulic fluid, It is used for the mounting structure of the actuator that is mounted on the vehicle in this assembled state, and is characterized in that a pipe holding cylinder that holds the pipe is provided projecting on both sides in the center of the flat plate portion of the grommet body.

  In a third aspect of the invention, a hose holding cylinder is provided at the center of the flat plate portion of the grommet body so as to protrude on both sides, and a hose that connects the master cylinder and a reservoir formed separately from the master cylinder to the hose holding cylinder is provided. It is characterized by holding.

  By configuring as described above, in the first invention, when the grommet is attached to the opening of the wall portion, the thin-walled portion is cut when the tip side of the elastic claw piece is deformed toward the inside of the claw piece accommodation hole, The elastic claw piece is deformed and the engaging protrusion engages with the inner peripheral edge of the opening. In addition, after the grommet is attached, the gap between the outer side of the tip of the elastic claw piece and the inner side of the claw piece receiving hole can be made as small as possible, and even if a load in the pulling direction is applied to the grommet body, The elastic claw piece can be prevented from opening outward by contacting the outer side surface of the elastic claw piece on the tip side and the inner side surface of the claw piece accommodation hole. Thereby, stress is not applied to the base end of the elastic claw piece and the base end is not deteriorated, and the engagement state between the engagement protrusion formed on the elastic claw piece and the inner peripheral edge of the opening can be kept good. it can.

  In 2nd and 3rd invention, after attaching a grommet to the opening of a wall part in the state holding a heavy and long member, such as piping and a hose, in a piping holding cylinder and a hose holding cylinder of a grommet body, piping and Even if a load is applied from the hose in the pulling direction, which is the pulling direction of the grommet body, it is possible to prevent the elastic claw piece from being burdened.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is an enlarged cross-sectional view of the main part of the grommet in a state of being attached to the opening of the wall part, FIG. 2 is an enlarged cross-sectional view of the main part of the grommet before being attached to the opening of the wall part, and FIG. 4 is a plan view of the grommet, FIG. 5 is a partially sectional bottom view of the grommet, FIG. 6 is a sectional view taken along line VI-VI in FIG. 4, and FIG. 7 is a piping system for a vehicle clutch to which the grommet of this embodiment is applied. FIG.

  The master cylinder 10 and the slave cylinder 20 used for the vehicle clutch are connected in advance using a metal pipe 40 and a rubber hose 41 together with a reservoir 30 for the master cylinder. The pipe 40 and the hose 41 are held by a pipe holding cylinder 51 and a hose holding cylinder 52 of a grommet 50 that closes an opening 42a provided in the wall 42 of the vehicle, and are held by the wall 42 by the grommet 50. The master cylinder 10 is disposed in the vehicle compartment, and the slave cylinder 20 and the reservoir 30 are disposed in the engine room, with the wall 42 interposed therebetween. In addition, the pipe 40 is subjected to bending processing according to the vehicle mounting state by a parts manufacturer, and is further assembled in a state in which the clutch fluid is filled in the system from the reservoir 30 to the slave cylinder 20. In a state, it is shipped from a parts manufacturing company to a vehicle assembly company. The vehicle assembly company does not perform any machining such as bending of the pipe 40, and the master cylinder 10, the slave cylinder 20, the reservoir 30, the pipe 40, etc. are installed in the vehicle. It is formed so that it can be attached.

  The master cylinder 10 and the slave cylinder 20 have the same basic configuration as a hydraulic cylinder, and cylinder bodies 11 and 21 serving as housings, and bottomed cylinder holes formed in the cylinder bodies 11 and 21. 11a and 21a, pistons 12 and 22 inserted into the cylinder holes 11a and 21a in a fluid-tight and movable manner, and hydraulic chambers 13 and 23 defined at the bottom of the cylinder holes 11a and 21a. . Connectors 14 and 24 are inserted into the pipe connection holes 11b and 21b communicating with the hydraulic pressure chambers 13 and 23, respectively, and the ends of the pipes 40 whose ends are flared into the connectors 14 and 24 are flare nuts 40a. , 40a, the hydraulic chambers 13 and 23 are in communication with each other through the pipe 40.

  A piston rod 15 is inserted into the opening side of the cylinder hole 11a of the master cylinder 10 and a piston rod 25 is inserted into the opening side of the cylinder hole 21a of the slave cylinder 20, respectively. Covered by protective boots 26. Further, the master cylinder 10 is connected to a hose connection hole 11c communicating with the hydraulic pressure chamber 13 with a connector 16 attached to the tip of the hose 41, whereby the hydraulic pressure chamber 13 and the reservoir 30 communicate with each other. . The slave cylinder 20 is provided with a bleeder hole 21 c communicating with the hydraulic pressure chamber 23, and a bleeder screw 27 is attached. After the vehicle is mounted, an operating element 17 such as a clutch pedal is connected to the outer end of the piston rod 15 of the master cylinder 10, and the tip of the release fork 28 for clutch comes into contact with the outer end of the piston rod 25 of the slave cylinder 20. Provided.

  As described above, the opening 42a provided in the wall portion 42 of the vehicle is formed in a size and shape that allows the master cylinder 10 assembled with the pipe 40 and the hose 41 to be connected. In the embodiment, an oval opening is formed in consideration of the outer shape of the master cylinder 10 and the connection state of the pipe 40 and the hose 41.

  The grommet 50 includes a grommet main body 53 formed of an elastic member such as a rubber material that closes the opening 42a, and an inner member 54 formed of a synthetic resin that engages with the inner peripheral side of the grommet main body 53. . The grommet body 53 includes an oval flat plate portion 53a that covers and closes the opening 42a, a first lip seal portion 53b that is formed on the outermost peripheral side of the inner member side surface of the flat plate portion 53a, A second lip seal portion 53c formed on the inner peripheral side of the first lip seal portion 53b, and a circumferential groove formed between the back surface of the first lip seal portion 53c and the flat plate portion 53a, into which the inner member 54 is fitted. 53d, and the pipe holding cylinder 51 and the hose holding cylinder 52 projecting from the central portion of the flat plate portion 53a on both sides. Further, a concave portion 53e is formed on the side surface of the inner member of the flat plate portion 53a so as to correspond to a formation position of an elastic claw piece 54d of the inner member 53 described later, and the elastic claw piece on the side surface of the anti-inner member of the flat plate portion 53a. A knob 53f and a pressing portion 53g are respectively formed at positions corresponding to 54d.

  The inner member 54 is formed on a frame body 54 a having a shape along the inner periphery of the opening 42 a and a flange larger than the opening 42 a formed on the grommet body side end surface of the frame body 54 a and fitted in the circumferential groove 53 d of the grommet body 53. It has the part 54b and the six engaging parts 54c which are formed in the frame 54a and engage with the inner periphery of the opening 42a. The engaging portion 54c has an elastic claw piece 54d that extends from the end of the frame 54a on the side opposite to the grommet main body and does not protrude from the end face on the grommet main body side, and the elastic claw piece 54d includes the frame 54a. And the claw piece accommodating hole 54e formed over the flange portion 54b. On the proximal end side of the elastic claw piece 54d, the thickness gradually increases from the proximal end side to the distal end side of the elastic claw piece 54d, protrudes from the outer periphery of the frame body 54a, and the distal end engages with the inner peripheral edge of the opening 42a. A mating protrusion 54f is provided. Further, the inner side surface of the claw piece receiving hole 54e facing the grommet center side is formed so as to protrude to the vicinity of the outer side surface on the front end side of the elastic claw piece 54d, and further, the inner side surface and the front end side of the elastic claw piece 54d. Are connected by a detachable thin portion 54g. Further, a positioning projection 53h is formed in the circumferential groove 53d of the grommet body 53, and a positioning recess 54h that engages with the positioning projection 53h is formed in the flange portion 54b of the inner member 54.

  Such an actuator for a clutch is assembled as follows. First, the flange portion 54b of the inner member 54 is fitted into the circumferential groove 53d of the grommet body 53, and the positioning protrusion 53h formed in the circumferential groove 53d and the positioning recess 54h formed in the flange portion 54b are engaged. The grommet 50 is formed by connecting the grommet main body 53 and the inner member 54 in a state in which the grommet main body 53 and the inner member 54 are prevented from relatively rotating. Thus, the grommet 50 formed by connecting the grommet main body 53 and the inner member 54 is provided with the frame body 54a on the inner side of the second lip seal portion 53c, and the engaging protrusion from the outer periphery of the frame body 54a. 54f protrudes. Next, the pipe material cut to a predetermined length is inserted into the pipe holding cylinder 51 of the grommet 50 as it is without being bent, and both ends of the pipe material are inserted through the flare nut 40a. Flare processing is applied to both ends of the piping material. And the said piping 40 is formed by giving a predetermined | prescribed bending process to the predetermined position of piping material.

  The flare nut 40a, which is the inner member side end of the pipe 40 that has been subjected to flare processing or bending, is connected to the connector 14 of the master cylinder 10 that is separately formed, and the pipe 40 is connected to the anti-inner member side end. The flare nut 40a is connected to the connector 24 of the slave cylinder 20 formed separately. Further, the hose 41 is inserted into the hose holding cylinder 52 of the grommet 50 and penetrated, and the inner member side end is in the hose connection hole 11c of the master cylinder 10 and the anti-inner member side end is in the hose connection portion 30a of the reservoir 30. Connect to. Finally, vacuum suction is performed from the bleeder hole 21 c to cause the clutch fluid in the reservoir 30 to flow into the system, and the clutch fluid is filled into the system from the reservoir 30 to the slave cylinder 20.

  The clutch actuator assembled in this manner is shipped from the parts manufacturer to the vehicle assembly company. The vehicle assembly company connects the master cylinder 10 with the pipe 40 and the hose 41 connected from the engine room side to the opening 42a. Then, the pressing portion 53g of the grommet main body 53 is pressed, and the frame body 54a of the inner member 54 is inserted into the opening 42a from the engine room side. The inner member 54 inserts the frame body 54a into the opening 42a of the wall portion 42 while deforming the distal end side of the elastic claw piece 54d toward the inside of the claw piece receiving hole 54e, and in this process, the thin portion 54g Is cut off, and the engaging projection 54f protrudes from the opening 42a toward the passenger compartment side, engages with the inner peripheral edge of the opening 42a on the passenger compartment side, and the first lip seal portion 53b and the second lip seal portion of the grommet main body 53. 53c is pressed by the flange part 54b, and is closely_contact | adhered to the engine chamber side surface of the wall part 42. FIG. Accordingly, the pipe 40 and the hose 41 are held in an airtight and watertight state in a state of penetrating the wall portion 42 by the grommet 50 fitted into the opening 42a having a size through which the master cylinder 10 can pass. Moreover, it can be confirmed whether the frame 54a is reliably engaged with the opening 42a by pulling the knob 53f after the grommet is attached. In the passenger compartment, the master cylinder 10 is attached at a predetermined position to connect the operation element 17. On the engine room side, the slave cylinder 20 is attached at a predetermined position, the pipe 40 is appropriately fixed, and the reservoir 30 is attached at a predetermined position. Thereby, by operating the operation element 17 with a clutch pedal or the like, the piston 12 moves to the bottom side of the cylinder hole 11 a via the piston rod 15, and a hydraulic pressure is generated in the hydraulic pressure chamber 13. This hydraulic pressure is transmitted to the hydraulic pressure chamber 23 of the slave cylinder 20 through the pipe 40, and the piston 22 is moved to the opening side of the cylinder hole 21a and the piston rod 25 is protruded to operate the release fork 28.

  As described above, the grommet 50 is formed by fitting the inner member 54 to the grommet main body 53, and the front end side of the elastic claw piece 54d of the inner member 54 is deformed toward the inside of the claw piece accommodation hole 54e. The body 54a is inserted into the opening 42a of the wall portion 42. In this process, the thin-walled portion 54g is cut, the engaging protrusion 54f protrudes from the opening 42a toward the passenger compartment, and the inner peripheral edge of the opening 42a on the passenger compartment side. Therefore, the grommet 50 can be easily and reliably attached to the opening 42a. Further, since the engaging protrusion 54f is formed so as to gradually increase in thickness from the proximal end side to the distal end side of the elastic claw piece 54d and the outer surface is tapered, the elastic claw piece with less resistance. 42a can be inserted into the opening 42a.

  The grommet 50 attached in this way is attached to the opening 42a with the engaging protrusion 54f formed on the inner member 54 engaging the inner peripheral edge of the opening 42a even if some external force is applied to the grommet main body 53. Since the flange portion 54 b of the inner member 54 is fitted in the circumferential groove 53 d of the grommet body 53, there is no possibility that the grommet 50 is detached from the wall portion 42. In this way, the grommet 50 can be easily and reliably attached to the opening 42a and the grommet 50 only by inserting and pressing the inner member 54 of the grommet 50 into the opening 42a of the wall portion 42 from the engine room side. Can be secured.

  Further, after the grommet 50 is attached to the opening 42a of the wall portion 42, even if a load is applied to the grommet 50 in the pulling direction that is the direction in which the grommet body 53 is pulled out via the pipe 40 or the hose 41, 54e is formed on the elastic claw piece side, and since the gap E1 between the outer end surface of the elastic claw piece 54d and the inner side surface of the claw piece receiving hole 54e is small, the front end side of the elastic claw piece 54d can be prevented from opening outward, There is no possibility that the base end 54i of the elastic claw piece 54d is stressed and the base end 54i is deteriorated, and the engagement state between the engagement protrusion 54f and the inner peripheral edge of the opening 42a can be kept good.

  Note that the grommet of the present invention may be provided with only one holding cylinder for holding the pipe, and a plurality of pipe holding cylinders having the same structure may be provided. Further, the grommet body may be provided with a positioning recess, and the inner member may be provided with a positioning projection to position the grommet body and the inner member.

It is a principal part cross-sectional enlarged view of the grommet of the state with which the opening of the wall part which shows one example of this invention was mounted | worn. It is a principal part expanded sectional view of the grommet before similarly mounting | wearing with opening of a wall part. It is a partial cross-sectional exploded perspective view of the grommet. It is a top view of a grommet similarly. It is a partial cross section bottom view of a grommet similarly. It is VI-VI sectional drawing of FIG. It is a piping system diagram of a clutch for vehicles to which a grommet of this embodiment is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Master cylinder, 11 ... Cylinder body, 12 ... Piston, 14, 16, 24 ... Connector, 20 ... Slave cylinder, 30 ... Reservoir, 40 ... Piping, 40a ... Flare nut, 41 ... Hose, 42 ... Wall part, 42a ... Opening, 50 ... Grommet, 51 ... Pipe holding cylinder, 52 ... Hose holding cylinder, 53 ... Grommet body, 53a ... Plate portion, 53b ... First lip seal, 53c ... Second lip seal, 53d ... Circumferential groove, 53e ... Recessed portion, 53f ... pick piece, 53g ... pressing portion, 53h ... positioning projection, 54 ... inner member, 54a ... frame body, 54b ... flange portion, 54c ... engaging portion, 54d ... elastic claw piece, 54e ... claw piece accommodation Hole, 54f ... engagement protrusion, 54g ... thin wall portion, 54h ... positioning recess, 54i ... base end of elastic claw piece

Claims (3)

In the grommet attached to the opening formed in the wall part that partitions the vehicle compartment and the engine room, the grommet is engaged with the grommet body formed of an elastic member that closes the opening, and the inner peripheral side of the grommet body. And the grommet body has a flat plate portion that covers the opening and closes the opening, and a circumferential groove that fits the inner member, and the inner member The member engages with a frame having a shape along the inner periphery of the opening, a flange portion formed on the grommet main body side end surface of the frame, and fitted into the peripheral groove, and an inner periphery of the opening. A plurality of engagement portions, and the engagement portions are provided on an elastic claw piece extending from an end portion on the anti-grommet body side of the frame body, and on a proximal end side of the elastic claw piece, An engaging projection that engages with the inner peripheral edge, the frame and the frame. And a claw piece receiving hole for deformably receiving the elastic claw piece, and a part of the outer side surface on the distal end side of the elastic claw piece and the inner side surface of the claw piece receiving hole. And a grommet that is connected in advance by a thin-walled portion that can be separated. The grommet is constructed by connecting a master cylinder and a slave cylinder, which are arranged across a wall, by piping, and assembling the master cylinder, the slave cylinder and the piping with hydraulic fluid, The grommet according to claim 1, wherein the grommet is used in a mounting structure of an actuator to be mounted, and a pipe holding cylinder for holding the pipe is provided to protrude on both sides in the center of a flat plate portion of the grommet body. In the center of the flat plate portion of the grommet body, a hose holding cylinder is provided to protrude on both sides, and the hose holding cylinder holds a hose connecting a reservoir formed separately from the master cylinder and the master cylinder. The grommet according to claim 2.

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