JP2020045844A - Bell mouth mounting structure - Google Patents

Abstract

To effectively prevent detachment of a bell mouth by relatively movably holding an end of the bell mouth to a fan ring.SOLUTION: A mounting structure 20 of a tubular bell mouth 14 mounted to a fan shroud 11 at one end, mounted to a fan ring 13 at the other end, and covering a gap between the fan shroud 11 and the fan ring 13, includes a large end 21 provided at an opening end of the bell mouth 14, and a C-sectioned caulking piece 22 provided at an outer periphery of the fan ring 13 and relatively movably housing and holding the large end 21 inside.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a bellmouth mounting structure, and more particularly to a bellmouth mounting structure that covers a gap between a fan shroud fixed to a radiator and a fan ring fixed to an engine.

  As an attachment structure of this kind of bell mouth, for example, in Patent Documents 1 and 2, one end of the bell mouth is fitted to a fan shroud fixed to a radiator, and the other end of the bell mouth is fixed to an engine. A structure is disclosed in which a bell mouth is attached between the fan shroud and the fan ring by elastically contacting the fan ring.

JP 2001-123836 A JP 2014-09636 A

  By the way, relative movement occurs between the fan shroud and the fan ring due to engine vibration and the like. For this reason, if the mounting force of the bellmouth cannot withstand the vibration or relative movement of the engine transmitted to the bellmouth via the fan ring, the bell mouth comes off the fan ring or the fan shroud and falls off. There are cases.

  An object of the technology of the present disclosure is to effectively prevent the bellmouth from falling off by holding at least one end of the bellmouth so as to be relatively movable with a fan ring and / or a fan shroud.

  The technology of the present disclosure is characterized in that one end side is attached to a fan shroud fixed to a radiator, and the other end side is attached to a fan ring surrounding a fan fixed to an engine, and a gap between the fan shroud and the fan ring is provided. A mounting structure of a cylindrical bell mouth that covers at least one open end of the bell mouth at the one end side or the other end side, and at least one of the fan ring and the fan shroud. A crimping piece having a C-shaped cross section is provided on one outer peripheral portion and accommodates and holds the large end portion so as to be relatively movable therein.

  The large end is provided at an open end on the other end side of the bell mouth, and the caulking piece is provided on an outer peripheral portion of the fan ring so as to open toward the fan shroud side, It is preferable that the fan ring is formed so as to increase in diameter from the fan shroud side to the engine side.

  Further, the axial width of the internal space of the caulking piece is formed larger than the outer diameter of the large end, and the opening width of the caulking piece is formed smaller than the outer diameter of the large end. Is preferred.

  According to the technology of the present disclosure, the bellmouth can be effectively prevented from falling off by holding at least one end of the bellmouth so as to be relatively movable with the fan ring and / or the fan shroud.

It is a typical rear view showing the fan shroud structure to which the bellmouth attachment structure concerning this embodiment was applied. FIG. 2 is a sectional view taken along line AA of FIG. 1. It is a typical sectional view showing the important section of the mounting structure of the bell mouth concerning this embodiment. It is a typical sectional view showing the mounting structure of the bell mouth concerning other embodiments. It is a typical sectional view showing the mounting structure of the bell mouth concerning other embodiments.

  Hereinafter, a bellmouth mounting structure according to the present embodiment will be described with reference to the accompanying drawings. The same components are denoted by the same reference numerals, and have the same names and functions. Therefore, detailed description thereof will not be repeated.

[overall structure]
FIG. 1 is a schematic rear view showing a fan shroud structure 10 to which a bellmouth mounting structure 20 according to the present embodiment is applied, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  The fan shroud structure 10 includes a fan shroud 11, a fan 12 disposed between the fan shroud 11 and the engine E (only shown in FIG. 2), a fan ring 13 fixed to the engine E and surrounding the fan 12. A bell mouth 14 is provided to cover between the fan shroud 11 and the fan ring 13.

  The fan shroud 11 is formed in a substantially rectangular cylindrical shape, and an opening edge on one end side is fixed to a back surface of a radiator (not shown) facing the engine E with a bolt or the like. On the other end of the fan shroud 11, an opening 11A having an inner diameter larger than the outer diameter of the fan 12 is formed. The opening 11 </ b> A is formed in a substantially circular shape, and defines a ventilation space 15 (only shown in FIG. 2) for guiding gas to the fan 12.

  The fan 12 is arranged so that its rotation axis coincides with the central axis (axis) of the fan ring 13, and is housed inside the fan ring 13. The fan 12 is driven to rotate by the power of the engine E, for example.

  The fan ring 13 is formed in a substantially frustoconical cylindrical shape whose diameter increases from the fan shroud 11 side to the engine E side (see FIG. 2), and is fixed to the engine E with bolts or the like (not shown). Further, a first annular flange portion 13A located on the fan shroud 11 side and a second annular flange portion 13B located on the engine E side are formed on the outer peripheral surface of the fan ring 13 (both in FIG. 2). Only shown). Further, between the first annular flange portion 13A and the second annular flange portion 13B of the fan ring 13, a caulking piece 22 (only in FIG. 2) which constitutes a part of a bellmouth mounting structure 20 described in detail later. Shown).

  The bell mouth 14 is formed in a substantially cylindrical shape with an elastic member such as a rubber material or a resin material, and covers a gap between the fan shroud 11 and the fan ring 13. For this reason, the bell mouth 14 is fitted and fixed to the annular recess 11B of the fan shroud 11 over substantially the entire periphery of the opening peripheral portion 14A on one end side (radiator side), and the opening on the other end side (engine side). The large end 21 provided at the end is fitted into the caulking piece 22 of the fan ring 13. Hereinafter, the bellmouth mounting structure 20 will be described in detail with reference to FIG.

[Bellmouth mounting structure]
FIG. 3 is a schematic sectional view showing the bellmouth mounting structure 20 according to the present embodiment.

  As shown in FIG. 3, the bellmouth mounting structure 20 includes a large end 21 provided at an opening end of the bellmouth 14 on the engine side, and a caulking piece 22 protruding from an outer peripheral portion of the fan ring 13. It has.

  The caulking pieces 22 are provided on the outer peripheral portion of the fan ring 13 at a predetermined pitch in the circumferential direction, and the large end 21 is provided at least at a portion corresponding to the caulking piece 22 at the open end of the bell mouth 14. . At least one pair of the caulking piece 22 and the large end portion 21 is arranged on the upper and lower diagonal, or two pairs are arranged on the upper, lower, left and right diagonal. In addition, the number and arrangement relationship of the caulking pieces 22 and the large end 21 are not limited to these, and can be appropriately set according to the size of the fan ring 13 and the bell mouth 14.

  The large end portion 21 is formed at the open end of the bell mouth 14 in a substantially circular cross section thicker than other portions of the bell mouth 14. The shape of the large end 21 is not limited to a circular cross section, and may be any shape such as an elliptical cross section or a rectangular cross section that is thicker than other portions of the bell mouth 14.

  The caulking piece 22 is formed in a substantially C-shaped cross section that opens to the fan shroud 11 side. Specifically, the caulking piece 22 protrudes radially outward from the outer peripheral portion of the fan ring 13 and bends toward the fan shroud 11 side, and the fan portion 22A has a substantially L-shaped cross section. It has a folded portion 22B folded toward the outer peripheral surface of the ring 13 integrally.

  The large end 21 of the bell mouth 14 can move relative to the fan ring 13 in an internal space 23 defined by the outer peripheral surface of the fan ring 13 and the inner peripheral surfaces of the main body 22A and the folded portion 22B. It is stored and held. Specifically, the axial width W1 and the radial width W2 of the internal space 23 are formed larger than the outer diameter D of the large end portion 21, and the axial width W1 is preferably larger than the radial width W2. It is formed large (W1> W2> D). The opening width W3 of the caulking piece 22 is formed smaller than the outer diameter D of the large end 21 (W3 <D). Further, the opening width W3 of the caulking piece 22 is preferably larger than the thickness of a portion other than the large end 21 of the bell mouth 14.

  That is, when the large end 21 is fitted into the caulking piece 22, the escape of the large end 21 from the caulking piece 22 is effectively regulated by the folded portion 22B on the opening side of the caulking piece 22. ing. Further, the large end 21 is accommodated and held in the internal space 23 of the caulking piece 22 so as to be relatively movable in the arrow X direction in the figure, so that the front and rear vertical direction of the engine E (the caulking piece 22 is arranged on the left and right sides). The bell mouth 14 can flexibly follow the relative movement between the fan ring 13 and the fan shroud 11 caused by the vibration in the right and left directions.

  According to the present embodiment described in detail above, the bell mouth 14 is provided with the large end 21 having a substantially circular cross-section at the opening end on the engine side at the engine side, and a fan A caulking piece 22 having a substantially C-shaped cross section open to the shroud 11 side and having an internal space 23 larger than the large end portion 21 is provided, and the large end portion 21 is fitted into the caulking piece 22 to obtain a large end. The portion 21 is configured to be held by the caulking piece 22 so as to be movable relative to the fan ring 13. This allows the bell mouth 14 to be reliably held by the fan ring 13 while flexibly following the relative movement between the fan ring 13 and the fan shroud 11 caused by vibration of the engine E and the like. It becomes possible to effectively prevent the mouse 14 from falling off.

  The large end 21 is not provided in an annular shape over the entire circumference of the bell mouth 14 but is provided partially at a predetermined pitch in the circumferential direction. That is, when assembling the bell mouth 14 to the fan ring 13, the worker can easily attach the bell mouth 14 to the fan ring 13 without spreading the bell mouth 14 with a large force, and the assembling workability is effectively improved. Can also be improved.

[Others]
Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

  For example, as shown in FIG. 4, the caulking piece 22 may be formed on the outer peripheral portion of the fan ring 13 to have a substantially C-shaped cross section that opens to the engine E side. In this case, preferably, the diameter of the fan ring 13 is reduced from the side of the fan shroud 11 toward the engine E, and the bell mouth 14 is folded back so that the large end 21 is fitted into the caulking piece 22. do it.

  Further, as shown in FIG. 5, the fan ring 13 may be formed in a substantially cylindrical shape without increasing or decreasing the diameter. Also in this case, it is possible to effectively absorb the vibration of the engine E, particularly in the front-rear direction.

  In addition, although the bellmouth mounting structure 20 of the present embodiment has been described as being applied to the mounting portion between the bellmouth 14 and the fan ring 13, it is applied to the mounting portion between the bellmouth 14 and the fan shroud 11. Is also good.

  Also, the large end 21 and the caulking piece 22 have been described as being partially provided at a predetermined pitch in the circumferential direction, but at least the large end 21 of the large end 21 and the caulking piece 22 is provided. It may be provided in an annular shape over the entire circumference in the circumferential direction.

DESCRIPTION OF SYMBOLS 10 Fan shroud structure 11 Fan shroud 12 Fan 13 Fan ring 14 Bellmouth 20 Bellmouth mounting structure 21 Large end part 22 Caulking piece

Claims (3)

One end is attached to a fan shroud fixed to a radiator, and the other end is attached to a fan ring surrounding the fan fixed to the engine, and covers a gap between the fan shroud and the fan ring. A mouse mounting structure,
A large end provided at at least one open end of the one end side or the other end side of the bell mouth,
A crimping piece having a C-shaped cross section that is provided on at least one outer peripheral portion of the fan ring or the fan shroud and that accommodates and holds the large end portion so as to be relatively movable. Bellmouth mounting structure. The large end is provided at an opening end on the other end side of the bell mouth, and the caulking piece is provided on an outer peripheral portion of the fan ring so as to open toward the fan shroud side, and the fan The bellmouth mounting structure according to claim 1, wherein the ring is formed so as to increase in diameter from the fan shroud side toward the engine side. The axial width of the internal space of the caulking piece is formed larger than the outer diameter of the large end, and the opening width of the caulking piece is formed smaller than the outer diameter of the large end. A bellmouth mounting structure according to claim 1 or 2.

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