JP2019132359A - Temporary fixing member - Google Patents

Abstract

To provide a temporary fixing member which can avoid that the member easily comes off due to plastic deformation at pressure-insertion.SOLUTION: A temporary fixing member 50 is formed of resin, and two members are temporarily fixed in a state that bolt insertion holes are aligned on the same axis by pressure-inserting one end into a bolt insertion hole of one member out the two members, and pressure-inserting the other end into a bolt insertion hole of the other member. The temperature fixing member 50 is composed of a small-diameter part 52 into which one member is pressure-inserted, and a large-diameter part 51 which is larger than the small-diameter part 52 in a diameter, thicker than the small-diameter part 52 in a thickness by its amount, and pressure-inserted into the other member. The small-diameter part 52 and the large-diameter part 51 have protrusions 51a, 52a protruding toward the outside of a radial direction at their external peripheral faces. In the temporary fixing member 50, a portion in which the protrusion 51a of the large-diameter part 51 is formed is thinned in a thickness compared with a portion in which the protrusion 51a of the large-diameter part 51 is not formed. (thickness T21<thickness T20).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a temporary fixing member for temporarily fixing another part to a part.

  Patent Document 1 discloses an attachment structure in which a high pressure pump is attached to a cylinder head cover via a bracket composed of a cylindrical lifter guide portion and a flange portion. In the mounting structure disclosed in Patent Document 1, an insulator is interposed between the flange portion of the bracket and the cylinder head cover.

JP 2004-353543 A

  In order to temporarily fix the insulator to the flange portion of the bracket, a resin temporary fixing member may be used. For example, in order to temporarily fix an annular insulator through which a bolt is inserted in the center coaxially with a bolt insertion hole of the flange portion, one end of a cylindrical temporary fixing member is press-fitted into the bolt insertion hole, and the other end is inserted into the insulator. Press fit into. Thus, if the temporary fixing member is arranged so as to connect the flange portion and the insulator, the insulator can be temporarily fixed to the flange portion of the bracket by using the restoring force of the press-fitted resin temporary fixing member.

  By the way, when the temporary fixing member is press-fitted in this manner and the two members are temporarily fixed, if the temporary fixing member is plastically deformed when the temporary fixing member is press-fitted, the temporary fixing member is likely to come off. There is a possibility that the member cannot be properly temporarily fixed.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The temporary fixing member for solving the above-mentioned problem is made of resin, and one end is press-fitted into the bolt insertion hole of one member, and the other end is press-fitted into the bolt insertion hole of the other member. A cylindrical temporary fixing member that temporarily fixes the two members in a state where the bolt insertion holes are coaxially positioned. The temporary fixing member includes a small-diameter portion that is press-fitted into the one member, and a large-diameter portion that is larger in diameter than the small-diameter portion and thicker than the small-diameter portion, and is press-fitted into the other member. The small-diameter portion and the large-diameter portion are each provided with a protrusion protruding outward in the radial direction on each outer peripheral surface. And in this temporary fix | stop member, the part in which the said protrusion in the said large diameter part is provided is thin compared with the part in which the said protrusion in the same large diameter part is not provided.

  In the case of a temporary fixing member composed of a thick large-diameter portion and a thin small-diameter portion as in the above configuration, the thick large-diameter portion is less elastically deformed during press-fitting than the small-diameter portion, and the projection of the large-diameter portion has a small diameter. Compared with the protrusion of the part, it is easy to plastically deform with press fitting. On the other hand, in the said structure, the part in which the protrusion in the large diameter part is provided is thin, and it is easy to elastically deform at the time of press fit. Therefore, it is possible to suppress the protrusions from being plastically deformed when the large diameter portion is press-fitted. As a result, it can suppress that a protrusion deform | transforms plastically and a temporary fixing member becomes easy to drop out.

Sectional drawing which shows the fixed aspect of the high pressure fuel pump using a temporary fix | stop member. The disassembled perspective view which shows the relationship between a temporary fixing member, an insulator, and a bracket. The top view of a temporary fix | stop member. The side view of a temporary fix | stop member.

Hereinafter, an embodiment of the temporary fixing member will be described with reference to FIGS.
The temporary fixing member of this embodiment is used in a mounting structure for fixing a high-pressure fuel pump to a head cover of an internal combustion engine.

  As shown in FIG. 1, the high-pressure fuel pump 100 includes a lifter 120 disposed between a camshaft of an internal combustion engine and a plunger 112. The lifter 120 is a roller lifter having a roller 125 at a portion that comes into contact with a drive cam provided on the camshaft.

  The high-pressure fuel pump 100 is attached to the head cover 200 of the internal combustion engine via a bracket 30 having a lifter guide portion 33. The lifter guide portion 33 has a cylindrical shape and is provided with an accommodation hole 31 for accommodating the lifter 120 at the center. The lifter 120 is accommodated in the accommodation hole 31. Thereby, the reciprocation of the lifter 120 by the action of the drive cam is guided by the lifter guide portion 33.

  The upper part of the lifter 120 has a cylindrical shape, and this part is a sliding part that slides with the inner wall of the accommodation hole 31 of the lifter guide part 33. In addition, the tip of the spring urging the plunger 112 and the tip of the plunger 112 are accommodated in the sliding portion.

  The bracket 30 includes a flange portion 32 that protrudes radially outward from the lifter guide portion 33. Similarly, the pump main body 110 includes a flange 111 protruding outward in the radial direction of the pump main body 110.

  As shown in FIG. 1, the high-pressure fuel pump 100 is fastened to the head cover 200 by a bolt 210 inserted through the flange 111. More specifically, with the annular insulator 40 sandwiched between the flange portion 32 of the bracket 30 disposed on the head cover 200 and the flange 111, bolts 210 are inserted through these from the flange 111 side. 200.

Both the bracket 30 and the insulator 40 are made of metal, and are positioned and temporarily fixed via a temporary fixing member 50 made of resin.
As shown in FIG. 2, the temporary fixing member 50 includes a bolt insertion hole 54 at the center. The temporary fixing member 50 is a cylindrical member in which a small-diameter portion 52 and a large-diameter portion 51 having a diameter larger than that of the small-diameter portion 52 are coaxially connected around the bolt insertion hole 54. Therefore, the large-diameter portion 51 is thicker than the small-diameter portion 52 by the amount larger than the small-diameter portion 52.

  In FIG. 2, the center axis CX of the bolt insertion hole 35 in the flange portion 32 is indicated by a one-dot chain line. As shown in FIG. 2, the upper portion of the bolt insertion hole 35 is an insertion hole 35 a that is expanded to accommodate the large-diameter portion 51 of the temporary fixing member 50. The large diameter portion 51 of the temporary fixing member 50 is press-fitted into the insertion hole 35a. The small diameter portion 52 of the temporary fixing member 50 is press-fitted into the bolt insertion hole 41 of the insulator 40. Thereby, the temporary fixing member 50 temporarily fixes the bracket 30 and the insulator 40 in a state where the bolt insertion holes 35 and 41 are coaxially positioned.

  The bolt 210 is inserted as described above in the temporarily fixed state, and the high-pressure fuel pump 100 is fastened to the head cover 200 with the insulator 40 sandwiched between the flange portion 32 and the flange 111 of the bracket 30. Yes.

  As shown in FIGS. 3 and 4, four protrusions 52 a that protrude radially outward are provided on the outer peripheral surface of the small diameter portion 52 of the temporary fixing member 50. The protrusions 52a are arranged to be evenly spaced in the circumferential direction of the small diameter portion 52.

  In addition, the part in which the protrusion 52a is provided in the small diameter part 52 is slightly depressed radially inward. As a result, as shown in FIG. 3, the thickness T11 of the portion of the small diameter portion 52 where the protrusion 52a is provided is slightly smaller than the thickness T10 of the portion of the small diameter portion 52 where the protrusion 52a is not provided. It is smaller (thickness T11 <thickness T10). The small-diameter portion 52 is centered on the central axis C of the bolt insertion hole 54, and the diameter of a circle passing through the apexes (points located on the outermost radial direction) of all the protrusions 52 a is that of the bolt insertion hole 41 of the insulator 40. The dimensions are set to be slightly larger than the inner diameter.

  Therefore, when the small diameter portion 52 is inserted into the bolt insertion hole 41 of the insulator 40, the portion of the small diameter portion 52 where the protrusions 52a are provided and the protrusions 52a are elastically deformed radially inward, and the small diameter portion 52 is It is press-fitted into the bolt insertion hole 41. Then, the small diameter portion 52 is prevented from coming off from the bolt insertion hole 41 by the restoring force of the elastically deformed small diameter portion 52.

  Further, as shown in FIGS. 3 and 4, four protrusions 51 a that protrude radially outward are also provided on the outer peripheral surface of the large-diameter portion 51 of the temporary fixing member 50. The projections 51a are arranged with the projections 52a of the small-diameter portion 52 aligned in the direction of the center axis C, and are evenly spaced in the circumferential direction of the large-diameter portion 51.

  Note that a through hole 51 b that penetrates the large diameter portion 51 in the extending direction of the central axis C is provided in a portion of the large diameter portion 51 where the protrusion 51 a is provided. Thus, as shown in FIG. 3, the thickness T21 of the portion of the large diameter portion 51 where the protrusion 51a is provided is larger than the thickness T20 of the portion of the large diameter portion 51 where the protrusion 51a is not provided. It is smaller (thickness T21 <thickness T20). The large diameter portion 51 is centered on the central axis C of the bolt insertion hole 54, and the diameter of a circle passing through the apexes of all the protrusions 51 a (the point positioned most radially outward) is the flange portion 32 of the bracket 30. The dimensions are set so as to be slightly larger than the inner diameter of the insertion hole 35a.

  Therefore, when the large-diameter portion 51 is inserted into the insertion hole 35a of the flange portion 32, the portion of the large-diameter portion 51 where the protrusions 51a are provided and the protrusions 51a are elastically deformed radially inward, and the large diameter The part 51 is press-fitted into the insertion hole 35a. Then, the large-diameter portion 51 is prevented from coming off from the insertion hole 35a by the restoring force of the elastically deformed large-diameter portion 51.

  When the insulator 40 is temporarily fixed onto the flange portion 32 of the bracket 30 using the temporary fixing member 50, first, the small diameter portion 52 of the temporary fixing member 50 is press-fitted into the bolt insertion hole 41 of the insulator 40, and the insulator 40 is then pressed. And the temporary fixing member 50 are combined.

  And the large diameter part 51 of the temporary fix | stop member 50 of the state combined with the insulator 40 is arrange | positioned on the insertion hole 35a of the bracket 30, and the insulator 40 is pushed into the flange part 32 side from the state. Thereby, the large diameter part 51 is pushed by the insulator 40 which contact | abutted to the upper surface 53 which is the surface by the side of the small diameter part 52 in the large diameter part 51, and the large diameter part 51 is press-fit in the insertion hole 35a. Thereby, the bracket 30 and the insulator 40 can be temporarily fixed in a state where the bolt insertion holes 35 and 41 are coaxially positioned.

The effect of this embodiment will be described.
(1) As described above, in the case of a temporary fixing member composed of a thick large-diameter portion and a thin small-diameter portion, the thick large-diameter portion is less likely to be elastically deformed during press-fitting than the small-diameter portion. The protrusions are more likely to be plastically deformed with the press-fitting than the protrusions of the small diameter portion. On the other hand, in the temporary fixing member 50 described above, the portion of the large diameter portion 51 where the protrusion 51a is provided is thinner than the portion where the protrusion 51a is not provided (thickness T21 <thickness). T20), it is easily elastically deformed during press-fitting. Therefore, it is possible to suppress the protrusion 51a from being plastically deformed when the large diameter portion 51 is press-fitted. As a result, it can suppress that the processus | protrusion 51a deforms plastically and the temporary fixing member 50 becomes easy to drop out.

  (2) The large-diameter portion 51 can be pushed into the insertion hole 35a by bringing the insulator 40 into contact with the upper surface 53 of the large-diameter portion 51 and pushing the insulator 40 larger than the small-diameter portion 52. Therefore, the assembly work is easy.

  (3) For example, when the structure which forms the convex part fitted by the insertion hole 35a in the metal insulator 40, and temporarily fixes the insulator 40 on the flange part 32 without using the temporary fixing member 50 is employ | adopted. Therefore, it is necessary to process the metal with high accuracy to realize the fitting of the convex portion and the insertion hole 35a. On the other hand, the temporary fixing member 50 made of resin on the assumption that it is elastically deformed as described above is easy to manufacture, and temporary fixing can be realized at a lower cost.

This embodiment can be implemented with the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
-You may change the number of protrusion 51a, 52a. In addition, the number of the protrusions 51a and the number of the protrusions 52a may not be the same, and the arrangement direction around the central axis C may not be aligned between the protrusions 51a and the protrusions 52a. Further, the protrusions 51a and 52a may not be evenly spaced in the circumferential direction.

  -The through-hole 51b was provided in the part in which the protrusion 51a in the large diameter part 51 was provided, and the part in which the protrusion 51a was provided was thin. On the other hand, even if the through hole 51b is not provided, the same effect as (1) can be obtained if the portion of the large diameter portion 51 where the protrusion 51a is provided is thin. Therefore, it may be thinned by another configuration without providing the through hole 51b. For example, a configuration in which a portion where the protrusion 51a is provided is thinned by providing a groove or a depression on the back surface (surface inside in the radial direction) of the portion where the protrusion 51a is provided in the large diameter portion 51 is adopted. Good.

  DESCRIPTION OF SYMBOLS 30 ... Bracket, 31 ... Housing hole, 32 ... Flange part, 33 ... Lifter guide part, 35 ... Bolt insertion hole, 35a ... Insertion hole, 40 ... Insulator, 41 ... Bolt insertion hole, 50 ... Temporary fixing member, 51 ... Large Diameter portion, 51a ... projection, 51b ... through hole, 52 ... small diameter portion, 52a ... projection, 53 ... top surface, 54 ... bolt insertion hole, 100 ... high pressure fuel pump, 110 ... pump body, 111 ... flange, 112 ... plunger, 120 ... Lifter, 125 ... Roller, 200 ... Head cover, 210 ... Bolt, T10, T11, T20, T21 ... Thickness.

Claims (1)

It is made of resin, and one end of the two members is press-fitted into the bolt insertion hole of one member, and the other end is press-fitted into the bolt insertion hole of the other member. A cylindrical temporary fixing member that is temporarily fixed in a coaxially positioned state,
A small-diameter portion that is press-fitted into the one member, and a large-diameter portion that is larger in diameter than the small-diameter portion and thicker than the small-diameter portion, and is press-fitted into the other member.
The small-diameter portion and the large-diameter portion each have a protrusion protruding outward in the radial direction on each outer peripheral surface;
A portion of the large diameter portion where the protrusion is provided is thinner than a portion of the large diameter portion where the protrusion is not provided.