JP4997158B2 - Seal member - Google Patents

Description

  The present invention relates to a seal member, and more particularly, to a seal member that seals between a peripheral body of an injector arranged upright on a cylinder head of an engine and a through hole formed in a cylinder head cover and through which the injector is inserted.

Conventionally, examples of the sealing member described above include those described in Patent Document 1 below. The following Patent Document 1 discloses a seal member (injection pipe seal) that includes a reinforcing ring and a seal main body, and is provided with a bellows portion on the base side of the tip end portion of the seal lip in the seal main body so as to be in close contact with the injector tube. Has been.
According to this, since the eccentric followability of the tip end portion of the seal lip with respect to the injector tube is ensured by providing the bellows portion, the tip end of the seal lip with respect to the injector tube even if there is radial play It is said that the part can be surely brought into close contact over the entire circumference.
JP-A-7-317917

The sealing member as described in the above-mentioned Patent Document 1 is configured such that a bolt is inserted into a bolt hole formed in a reinforcing ring, and the bolt is screwed into a screw hole formed in a cylinder head cover. It is fastened to the head cover.
In this case, since the bolt functions only to fasten the seal member to the cylinder head cover, a bolt for fastening and fixing the cylinder head cover to the cylinder head separately is required. Therefore, it is necessary to separately provide a bolt hole corresponding to the bolt, a washer member, etc. accompanying this, and a member for supporting and fixing the injector to the cylinder head is also required separately. In order to increase the cost, reduction of the number of parts has been demanded.
Also, the sealing member described in the cited document 1 requires a process of attaching the sealing member to the cylinder head cover in advance before assembling the cylinder head cover to the cylinder head. It had been. In addition, the bolt washer member that fastens and fixes the cylinder head cover to the cylinder head and the seal member that seals the periphery of the injector are separate members. Improvement is required to further increase man-hours.

  This invention is made | formed in view of the said situation, and it aims at providing the sealing member which can aim at the improvement of a sealing performance, and reduction of an assembly man-hour.

  A seal member according to the present invention is a seal member that seals between an injector that is inserted and supported in a fastening structure in which a cylinder head cover is fastened to a cylinder head of an engine by a bolt and a through hole of the cylinder head cover. A board portion including an injector through-hole portion and a bolt washer portion corresponding to each of the through-hole of the cylinder head cover and the bolt insertion hole for the bolt formed in the vicinity thereof, and the board portion in the board portion. The elastic seal portion is fixed to the inner peripheral edge portion of the injector through-hole portion and elastically contacts the peripheral body of the injector, and is fastened and fixed to the cylinder head cover by the bolt via the bolt washer portion of the substrate portion. It is characterized by being.

In the present invention, an elastic washer seal portion may be fixed to a surface of the washer portion on the cylinder head cover side. Further, the elastic washer seal portion may be formed integrally with the elastic seal portion.
In the present invention, the elastic seal portion and the substrate portion may be made of a rubber material and a metal plate, respectively, and the elastic seal portion may be integrally fixed to the metal plate by vulcanization molding of the rubber material. The bolt may further include a fixing part for supporting and fixing the injector to the cylinder head.

Since the sealing member according to the present invention is fastened to the cylinder head cover by bolts for fastening and fixing the cylinder head cover to the cylinder head, each bolt used for fastening fastens the cylinder head cover to the cylinder head. Since it functions to fix and seal the seal member to the cylinder head cover, the number of parts can be reduced.
Therefore, the process of assembling the seal member in advance to the cylinder head cover can be omitted, so that the seal member can be attached in the process of assembling the cylinder head cover to the cylinder head, and the number of parts can be reduced. In addition, the number of assembly steps can be reduced.

  Further, the seal member is composed of a base plate portion provided with a bolt washer portion and an injector through-hole portion, and a seal portion fixed to the inner peripheral edge portion of the injector through-hole portion and elastically contacting the circumference of the injector. The seal portion elastically contacting the peripheral body can satisfactorily seal between the injector and the through hole, and the seal member can be prevented from falling off due to the attachment / detachment of the injector. That is, for example, even if the injector is removed from the cylinder head, the seal member is bolted and the seal portion is fixed to the substrate portion, so the seal member does not fall off, and it is not necessary to take measures to prevent the dropout. The number of parts can be reduced.

  Further, if the elastic washer seal portion is fixed to the cylinder head cover side surface of the washer portion, the tightening force by the bolt can be increased and the sealing performance of the bolt portion can be maintained. Further, since the vibration of the cylinder head cover can be absorbed, the cylinder head cover can be softly fastened and noise caused by the vibration can be reduced.

  If the elastic washer seal portion is formed integrally with the elastic seal portion, the cylinder head cover side surface of the seal member is made of a sealing material, so that the washer seal of the fastening portion between the cylinder head cover and the cylinder head is formed. The function and the injector seal function are expressed by the integrated seal portion, and the sealing performance between the cylinder head cover and the seal member can be enhanced.

  The elastic seal portion and the substrate portion are each made of a rubber material and a metal plate, and when the elastic seal portion is integrally fixed to the metal plate by rubber material vulcanization molding, the elastic seal portion is vulcanized to the substrate portion. Since it can be integrally fixed by molding, it can be easily manufactured, the elastic seal portion does not fall off from the substrate portion, and the bolt can be smoothly fastened to the cylinder head cover. In particular, when the elastic washer seal portion and the elastic seal portion are integrated, a device having both the above-described functions (washer seal function and injector seal function) can be easily obtained.

Furthermore, if the bolt has a fixing portion for supporting and fixing the injector to the cylinder head, the cylinder head cover is fastened and fixed to the cylinder head and the seal member is fastened to the cylinder head cover as described above. In addition, the function of supporting and fixing the injector to the cylinder head can also be achieved.
Therefore, the number of parts can be greatly reduced, the assembly process can be simplified, and the injector can be stably supported and fixed to the cylinder head while sealing the periphery of the injector.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a state where an injector inserted into a cylinder head is sealed by a sealing member according to a first embodiment of the present invention, FIG. 2A is a longitudinal sectional view of the sealing member, and FIG. Is a plan view of the seal member, FIG. 3 is a view similar to FIG. 2A showing a modification of the seal member, and FIG. 4 is an injector inserted into the cylinder head by the seal member of the second embodiment of the present invention. It is sectional drawing which shows the state which sealed.

First, based on FIGS. 1-3, the 1st Embodiment of this invention is described.
In the figure, a sealing member 4 according to the present invention is inserted into a through hole 1a formed in a cylinder head cover 1 of an engine and supported so as to reach the cylinder head 2, and a through-hole of the cylinder head cover 1 is shown. The example used as what seals between the holes 1a is shown.
An injector through hole 2a through which a cylindrical injector 3 for injecting an appropriate amount of fuel is formed is formed in a cylinder head 2 constituting a part of a combustion chamber (not shown). The injector through hole 2a is sandwiched between the injector through holes 2a. On both sides, two bolt holes 2b through which the bolts 5 penetrating the cylinder head cover 1 are inserted are provided, and female screws are formed in the bolt holes 2b so that the bolts 5 are screwed.

  A cylinder head cover 1 with a lower opening is fastened and fixed above the cylinder head 2, and a through hole 1 a through which the injector 3 is inserted is formed in the cylinder head 2. It is provided corresponding to the injector through hole 2a. Two bolt insertion holes 1b corresponding to the bolt holes 2b are formed in the vicinity of the through hole 1a, that is, on both sides of the through hole 1a. A stepped portion 1c is formed at the peripheral edge of the upper end side of the through hole 1a of the cylinder head cover 1, and a seal portion 7 of a seal member 4 to be described later elastically contacts the circumferential body 3a of the injector 3 at the stepped portion 1c. It is formed so as to extend. Further, the upper peripheral edge 1 e of the bolt insertion hole 1 b of the cylinder head cover 1 is formed in a stepped shape corresponding to the shape of the washer seal portion 71 of the seal member 4 described later.

The seal member 4 includes a substrate portion 6 made of a metal material such as an SPCC steel plate and an elastic seal portion 7, and is fastened to the cylinder head cover 1 by bolts 5. The bolt 5 includes a bolt shaft 51 below the bolt head 5a. The bolt shaft 51 is a screw in which a cylindrical portion 5b that penetrates the cylinder head cover 1 and a male screw that engages with a female screw formed in the bolt hole 2b. Part 5c.
As shown in FIGS. 2A and 2B, the board 6 includes a bolt washer 61 corresponding to the bolt insertion hole 1b of the cylinder head cover 1 and an injector through-hole 62 corresponding to the through hole 1a. The washer portion 61 is formed at two locations with the through-hole portion 62 interposed therebetween. The seal portion 7 is made of a rubber material such as FKM, NBR, H-NBR, EPDM, CR, ACM, AEM, VMQ, and FVMQ, and is integrally fixed to the substrate portion 6 by vulcanization molding of the rubber material.
Therefore, since the seal portion 7 is integrally fixed to the substrate portion 6, the seal portion 7 itself does not fall off due to the attachment / detachment of the injector 3.

The seal member 4 is fastened and fixed to one injector 3 by two bolts 5 to seal the peripheral body 3a of the injector 3, and the bolt 5 fastens the seal member 4 to the cylinder head cover 1. In addition, it has a function of fastening and fixing the cylinder head cover 1 to the cylinder head 2.
According to this, since the bolt 5 for fastening and fixing the cylinder head cover 1 to the cylinder head 2 is fastened to the cylinder head cover 1, each bolt 5 used for fastening fastens the cylinder head cover 1 to the cylinder. Since it functions to fasten and fix to the head 2 and to fasten the seal member 4 to the cylinder head cover 1, the number of parts can be reduced.
Therefore, since the process of assembling the seal member 4 in advance to the cylinder head cover 1 can be omitted, the seal member 4 can be attached in the process of assembling the cylinder head cover 1 to the cylinder head 2. Not only can the number of parts be reduced, but also the number of assembly steps can be reduced.

A washer seal portion 71 is fixed to the surface of the washer portion 61 of the substrate portion 6 on the cylinder head cover 1 side, and an injector seal portion 72 is fixed to the inner peripheral edge portion of the through hole portion 62.
The washer seal portion 71 is fixed to the surface on the cylinder head 1 side including the inner peripheral edge portion of the washer portion 61 as described above, and is formed integrally with the injector seal portion 72. The washer seal portion 71 includes a protrusion 71 a that protrudes toward the bolt 5 inserted from the inner peripheral edge portion of the washer portion 61.

According to this, the sealing member 4 is fixed to the peripheral portion 3a of the injector 3 fixed to the inner peripheral edge portion of the base plate portion 6 provided with the bolt washer portion 61 and the injector through-hole portion 62 and the injector through-hole portion 62. Since the injector seal portion 72 that is elastically contacted is provided, it is possible to satisfactorily seal between the injector 3 and the through hole 1a by the injector seal portion 72 that elastically contacts the peripheral body 3a of the injector 3. Further, since the seal member 4 is fastened to the cylinder head cover 1 by the bolt 5, the seal member 4 can be prevented from dropping off due to the attachment / detachment of the injector 3. That is, for example, even if the injector 3 is removed from the cylinder head 2, the seal member 4 is fixed by the bolt 5, and the washer seal portion 71 and the injector seal portion 72 are fixed to the substrate portion 6, so that the seal member 4 falls off. And there is no need to take measures to prevent dropout, so the number of parts can be reduced.
Further, the washer seal portion 71 is compressed between the upper surface of the cylinder head cover 1 and the substrate portion 6 as the bolt 5 is fastened, and seals the fastening portion of the bolt 5, and the elasticity of the cylinder head cover 1 is vibrated. Absorbs. Further, since the protrusion 71a bulges with the compression, it is elastically contacted with the bolt 5, so that the sealing performance at this portion is further enhanced.

The injector seal portion 72 is formed so as to elastically contact the peripheral body 3a of the injector 3 so as to reach the stepped portion 1c formed in the cylinder head cover 1, and the cross section protruding toward the peripheral body 3a has a mountain-shaped protrusion. 72a and a circumferential protrusion 72b that elastically contacts the side surface 1d of the stepped portion 1a. The circumferential protrusion 72b is provided at two places.
Even if vertical vibration is generated in the axial direction of the injector 3 by the injector seal portion 72, the vibration can be absorbed. Even if the injector 3 is inclined, the protrusion 72a of the injector seal portion 72 is Since it protrudes toward the peripheral body 3a, it can be elastically deformed following the vibration of the injector 3 and the sealing performance can be maintained.
In addition, if the allowance with respect to the side surface 1d of the level | step-difference part 1a of the circumferential protrusion 72b is set suitably, the temporary assembly | attachment to the cylinder head cover 1 of the injector seal part 72 can be performed. The configurations and shapes of the substrate portion 6 and the seal portion 7 are not limited to those shown in the drawings. For example, three washers are provided so as to be fastened with three bolts, or the protrusion 72a. A plurality of may be formed. Furthermore, the circumferential protrusion 72b is not limited to two places, and may be provided with one place or three places or more.

  The procedure for assembling the seal member 4 is to first place the cylinder head cover 1 above the cylinder head 2. At this time, alignment is performed so that the injector through hole 2a and the bolt hole 2b formed in the cylinder head 2 correspond to the through hole 1a and the bolt insertion hole 1b formed in the cylinder head cover 1. The seal member 4 is disposed at a predetermined assembly location, the bolt 5 is inserted into each of the bolt washers 61 of the seal member 4, and the bolt 5 is fastened. The bolt 5 passes through the base plate portion 6, the seal portion 7, and the cylinder head cover 1 of the seal member 4, reaches the bolt hole 2 b of the cylinder head 2, and is screwed to a female screw formed in the bolt hole 2 b. The cylinder head cover 1 can be fastened and fixed, and the seal member 4 can be fastened to the cylinder head cover 1.

Then, after the seal member 4 is assembled to the cylinder head cover 1 and tightened with the bolt 5, the injector 3 is inserted into the through hole 62, the through hole 1a and the injector through hole 2a from above, and the lower end of the injector 3 An injector 3 is arranged so that an appropriate amount of fuel is injected into the cylinder head 2 from the portion, and the injector 3 is supported and fixed by a fixture (not shown).
At this time, the projecting portion 72 a of the injector seal portion 72 is elastically contacted with the peripheral body of the injector 3 to be compressed and deformed, and a restoring elasticity is generated toward the peripheral body of the injector 3. Further, the circumferential protrusion 72b of the injector seal portion 72 is pressed against the side surface 1d of the step portion 1c and is compressed and deformed by the provision of the injector 3. Then, the restoring elasticity becomes a pressing force toward the circumference of the injector 3, and the space between the circumference of the injector 3 and the through hole 1 a of the cylinder head cover is tightly sealed by a synergistic effect with the restoration elasticity of the protrusion 72 a. Can do.
The assembling procedure of the seal member 4 is not limited to the above.

FIG. 3 shows a modified example of the seal member 4. In the injector seal portion 72 of the seal portion 7, the circumferential protrusion 72 b is provided only at one place, and the injector seal portion 72 is provided on the substrate portion 6. The difference is that it is formed around the bent portion 61c. Another difference is that the washer seal portion 71 and the injector seal portion 72 are not integrally formed.
Thus, even if there is only one circumferential protrusion 72b, the projecting part 72a is elastically contacted with the peripheral body 3a of the injector 3, so that sealing performance can be secured, and the bolt 5 is inserted into the washer 61 and tightened. If worn, the cylinder head cover 1 and the cylinder head 2 and the seal member 4 and the cylinder head cover 2 can be firmly fastened.
Since other configurations are the same as those described above, the same reference numerals are given to the common portions, and descriptions thereof are omitted.

Next, a second embodiment of the present invention will be described based on FIG.
The bolt 9 of the seal member 4 in the second embodiment is further different from the above-described embodiment in that it includes a fixing portion 8 for supporting and fixing the injector 3 to the cylinder head 2 and the configuration of the bolt. is there.
The bolt 9 is a stud bolt in which male screw portions 9b and 9c are formed at both upper and lower ends, and the lower end portion of the bolt 9 passes through a washer portion 61 of the base plate portion 6 and a bolt insertion hole 1b of the cylinder head cover 1 to form a cylinder. It is screwed into a bolt hole 2b formed in the head 2. In the figure, reference numeral 92 denotes a pressing member for the cylinder head cover 1.

  The upper end portion of the bolt 9 is formed with a hexagonal tool action portion 9a, and is fitted to a tightening tool (not shown) for fastening the bolt 9 to the cylinder head 2. Yes. The fixing portion 91 includes a male screw portion 9b at the upper end of the bolt 9 and a nut 91 screwed into the male screw portion 9b. In the figure, reference numeral 8 denotes a fixing member 8 for fixing the injector 3, and is pressed by a flange portion 91 a of the nut 91. The fixing member 8 includes a through hole 8a through which the injector 3 is inserted, and a bolt insertion hole 8b through which the bolt 9 is inserted. The bolt insertion hole 8b is formed at two positions on both sides of the through hole 8a. The injector 3 is disposed on the step 3b of the injector 3 so as to support and fix the injector 3.

The assembly procedure of the seal member 4 and the fixing support process of the injector 3 will be described.
First, the cylinder head cover 1 is disposed above the cylinder head 2. At this time, alignment is performed so that each of the injector through hole 2a and the bolt hole 2b formed in the cylinder head 2 corresponds to the through hole 1a and the bolt insertion hole 1b formed in the cylinder head cover 1, Thereafter, the seal member 4 is disposed at a predetermined assembly position. A predetermined portion of the cylinder head cover 1 is fastened and fixed to the cylinder head 2 by a plurality of bolts (not shown), and the bolt 9 is attached to the cylinder head 2 via the washer portion 61 of the seal member 4 and the bolt insertion hole 1b of the cylinder head cover 1. It is inserted toward the bolt hole 2b. By fitting the tightening tool to the tool operating portion 9a and performing a tightening operation, the male screw 9c at the lower end of the bolt 9 and the female screw formed in the bolt hole 2b are screwed together and tightened. At this time, the seal member 4 is firmly pressed against the cylinder head cover 1 by the pressing member 92 to be in a fastened state.

Then, the injector 3 is inserted into the through-hole portion 62, the through-hole 1a, and the injector through-hole 2a from above, and the injector 3 is arranged so that an appropriate amount of fuel is injected into the cylinder head 2 from the lower end portion of the injector 3. .
In this state, the bolt insertion hole 8b of the fixing member 8 is inserted into the bolt 9, the fixing member 8 is disposed on the step portion 3b of the injector 3, and the nut 91 is inserted into the bolt insertion hole 8b. Fix with 91.

According to the above, the bolt 9 not only fastens and fixes the cylinder head cover 1 to the cylinder head 2 and fastens and fixes the seal member 4 to the cylinder head cover 2, but also has a function of supporting and fixing the injector 3 to the cylinder head 2. It can be played.
Therefore, the number of parts can be greatly reduced, the assembly process can be simplified, and the injector 3 can be stably supported and fixed to the cylinder head 2 while the peripheral body 3a of the injector 3 is reliably sealed. .

  The configuration and shape of the injector 3, the cylinder head 2, the cylinder head cover 1, the seal member 4 and the like are not limited to those shown in the drawings, and the injector 3 is also disposed on the cylinder head 2 of the DOHC engine or SOHC engine. It is applicable as a sealing member.

It is sectional drawing which shows the state which sealed the injector inserted in the cylinder head by the sealing member of 1st Embodiment in this invention. (A) is the longitudinal cross-sectional view of the board | substrate part and seal part of the seal member, (b) is the top view of the substrate part and seal part of the seal member. It is the same figure as Fig.2 (a) which shows the modification of the board | substrate part and seal part of the sealing member. It is sectional drawing which shows the state which sealed the injector inserted in the cylinder head with the sealing member of 2nd Embodiment in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder head cover 1a Through-hole 1b Bolt insertion hole 2 Cylinder head 3 Injector 3a Circumference 4 Seal member 5, 9 Bolt 6 Substrate part 61 (For bolts) Washer part 62 (For injectors) Through-hole part 7 (Elastic) Seal part 71 (Elastic) washer seal part 72 (injector) seal part

Claims (5)

A sealing member that seals between an injector that is inserted and supported in a fastening structure in which a cylinder head cover is fastened to a cylinder head of an engine by a bolt, and a through hole of the cylinder head cover,
A board portion provided with an injector through hole portion and a bolt washer portion corresponding to each of the through hole of the cylinder head cover and the bolt insertion hole for the bolt formed in the vicinity thereof, and the injector in the board portion An elastic seal portion fixed to the inner peripheral edge portion of the through-hole portion for use and elastically contacting the periphery of the injector;
The sealing member, wherein the bolt is fastened and fixed to the cylinder head cover by a bolt washer portion of the base plate portion. The seal member according to claim 1,
An elastic washer seal portion is fixed to a surface of the washer portion on the cylinder head cover side. The seal member according to claim 2,
The elastic washer seal portion is formed integrally with the elastic seal portion. The seal member according to any one of claims 1 to 3,
The elastic seal portion and the substrate portion are each made of a rubber material and a metal plate, and the elastic seal portion is integrally fixed to the metal plate by vulcanization molding of a rubber material. The seal member according to any one of claims 1 to 4,
The said bolt is further provided with the fixing | fixed part for supporting and fixing the said injector to a cylinder head, The sealing member characterized by the above-mentioned.

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