JP2017081244A - Attachment structure of fan cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a fan cover which can prevent the co-rotation of the fan cover without lowering the attachment workability of the fan cover.SOLUTION: In an attachment structure of a fan cover 3, a shroud 2 has a protrusion 26 which is formed so as to progress along a peripheral direction of a peripheral edge 24 of an opening part 22, and protruded to a centrifugal direction at a side opposite to a center direction of the opening part, and a recess 28A which is formed at a front side of the protrusion, and recessed to the center direction. An annular part 32 has a gripping part 36 which has a restoration force for restoring a diameter of a ring to a diameter-contracted state in that the diameter of the ring is contracted from a diameter-expanded state in that the diameter of the ring is expanded, is arranged so as to progress along a peripheral direction of the annular part, fit to the protrusion so as to grip the protrusion from a fore-and-aft direction in the diameter-contracted state, and prevents the fore-and-aft movement of the fan cover with respect to the opening part, and a fitting part 38A which is arranged at the annular part, fit into the recess in the diameter-contracted state, and prevents the rotation of the fan cover with respect to the opening part.SELECTED DRAWING: Figure 5

Description

  A shroud is attached to the rear of the radiator. The shroud has an opening that guides the airflow from the radiator to the rear. A fan that is rotationally driven by an engine (not shown) is disposed behind the opening. The fan is surrounded by an annular fan cover. The fan cover is attached to the opening. An aluminum or iron fan guide ring is provided along the inner periphery of the fan cover. The gap between the fan guide ring and the fan is kept constant.

  As a conventional fan cover mounting structure, a fitting portion is provided in the opening, and a fitted portion is provided in the fan cover. The fan cover is prevented from being removed from the opening by fitting the fitted portion to the fitting portion.

  However, since the conventional fan cover mounting structure allows the fan cover to move in the rotational direction relative to the opening, the fan cover rotates around the opening due to engine vibration or the like. ). When the fan cover is rotated, the inner peripheral edge of the fan cover and the fan guide ring along the inner peripheral edge are not circular. Therefore, when the fan cover rotates relative to the fan guide ring, the inner peripheral edge of the fan cover and the fan guide ring A gap is formed between Thereby, there exists a possibility that the performance which cools a radiator may fall. For this reason, it is necessary to separately provide means such as a band for preventing rotation.

  As a technique for assembling the shroud, for example, Patent Document 1 discloses a technique in which a claw on the lower half peripheral wall side of the shroud is fitted into a locking hole on the main body side.

  As a technique for attaching a shroud to a radiator, Patent Document 2 discloses a technique in which an engagement claw of a shroud side hook is engaged with an engagement hole of a radiator side receiving part.

JP 2006-097545 A JP 59-102937 A

  However, in the technique of Patent Document 1, it is possible to prevent the fan cover from rotating by locking the claw on the lower half peripheral wall side to the locking hole on the main body side. Since this is a technology for fitting from behind, this technology is difficult to employ as a fan cover mounting structure for mounting the fan cover to the shroud using its restoring force.

  Moreover, in the technique of Patent Document 2, since the hook is engaged with the engaging claw of the hook after the hook is fitted into the hook, this technique is used as the fan cover mounting structure. When this is adopted, there is a problem that the fan cover mounting workability is lowered.

  The present invention provides a fan cover mounting structure capable of preventing the fan cover from being rotated without reducing the fan cover mounting workability.

The mounting structure of the fan cover according to the present invention is as follows:
A shroud is arranged on the rear side of the radiator, an opening for guiding the airflow from the radiator to the rear is provided in the shroud, a fan for cooling the radiator is arranged at a rear position of the opening, and an annular portion surrounding the fan In a fan cover mounting structure in which a fan cover having
The shroud is
A ridge that is provided along the circumferential direction of the periphery of the opening, and protrudes in a centrifugal direction opposite to the central direction of the opening;
A recess provided on the front side of the ridge, and recessed in the central direction;
Have
The annular portion is
It has a restoring force to restore the expanded diameter state of the ring from the expanded state to the reduced diameter state of the ring,
It is provided along the circumferential direction of the annular part, and in the reduced diameter state, the convex part is fitted to the convex part so as to sandwich the convex part from the front and back, and the fan cover moves forward and backward relative to the opening. A clamping part to prevent,
A fitting portion that is provided in the annular portion and fits in the recess in the reduced diameter state to prevent rotation of the fan cover with respect to the opening;
Have

  According to the present invention, it is possible to prevent the fan cover from being rotated without reducing the fan cover mounting workability.

It is a figure which shows the attachment state of the fan cover which concerns on this invention. It is sectional drawing which shows the attachment structure of the fan cover which concerns on this invention. It is a partial expansion perspective view of the shroud which concerns on this invention. It is a partial expansion perspective view of the fan cover concerning the present invention. It is sectional drawing which shows the attachment structure of the fan cover which concerns on this invention. It is a partial expansion perspective view of the shroud which concerns on this invention. It is a partial expansion perspective view of the fan cover concerning the present invention. It is sectional drawing which shows the attachment structure of the fan cover which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a mounting state of a fan cover according to the present invention. In the following description, the front of the vehicle may be simply referred to as “front”, and the rear of the vehicle may be simply referred to as “rear”. As shown in FIG. 1, a shroud 2 is attached to the rear of the radiator 1. The shroud 2 has a substantially circular opening 22 (see FIG. 2) that guides the airflow from the radiator 1 to the rear. A fan (not shown) that is rotationally driven by an engine (not shown) is disposed behind the opening 22. A fan cover 3 is arranged so as to surround the fan. The fan cover 3 is attached to the opening 22. Note that a direction from the outside of the opening 22 toward the center position may be referred to as a “center direction”, and a direction from the center position to the outside of the opening 22 may be referred to as a “centrifugal direction”.

  FIG. 2 is a cross-sectional view showing the mounting structure of the fan cover 3 when section C shown in FIG. 1 is cut along the vehicle longitudinal direction. In addition, C part shows general parts other than A part and B part here.

  As shown in FIG. 2, a ridge 26 is provided along the circumferential direction at the rear end of the peripheral edge 24 of the opening 22. The protruding portion 26 protrudes in the centrifugal direction opposite to the center direction of the opening 22 of the peripheral edge 24.

  The peripheral edge 24 is provided with a protrusion 27 along the circumferential direction at a position in front of the ridge 26. The protruding portion 27 protrudes in the centrifugal direction opposite to the central direction of the opening 22 of the peripheral edge 24. The space | interval of the front-back direction between the protruding item | line part 26 and the projection part 27 is constant.

  The fan cover 3 has an annular portion 32 that surrounds the fan. At the front end portion of the annular portion 32, a sandwiching portion 36 that is fitted to the protruding strip portion 26 is provided so as to sandwich the protruding strip portion 26 from the front and rear. In a state in which the sandwiching portion 36 is fitted to the protruding portion 26, the hook portion 261 provided at the tip of the protruding portion 26 is locked to the locked portion 361 provided at the tip of the holding portion 36.

  The annular portion 32 has a restoring force for restoring from a diameter-expanded state (a state extended in the circumferential direction) to a diameter-reduced state (a state contracted in the circumferential direction). In the mounting operation of the fan cover 3, when the clamping portion 36 is fitted to the ridge 26 over the entire circumference, the annular portion 32 is moved from the reduced diameter state to the expanded diameter state against the restoring force. As a raw material of the fan cover 3, for example, ethylene / propylene / diene rubber (EPDM) or ethylene / propylene rubber (EPM) is used.

  As shown in FIG. 2, the position of the surface of the annular portion 32 substantially coincides with the position of the tip of the protruding portion 27 in a state where the sandwiching portion 36 is fitted to the ridge portion 26. If the fitting state is insufficient, the surface of the annular portion 32 swells in the centrifugal direction from the position of the tip of the protruding portion 27. That is, based on the position of the surface of the annular portion 32 with respect to the position of the tip of the protruding portion 27, it can be determined whether or not the sandwiching portion 36 is sufficiently fitted to the ridge portion 26.

3 is a partially enlarged perspective view of a portion A shown in FIG. The A part is located at the uppermost position among the peripheral edges 24 of the opening 22.
As shown in FIG. 3, the protrusion 27 is provided with a substantially V-shaped recess 28A that is recessed in the center direction. The width in the circumferential direction of the recess 28A is gradually narrowed toward the center direction.

FIG. 4 is an enlarged perspective view of a portion A shown in FIG.
As shown in FIG. 4, the front end of the annular portion 32 is provided with a fitting portion 38 </ b> A that fits into the recess 28 </ b> A and prevents the fan cover 3 from rotating with respect to the opening 22. The fitting part 38 </ b> A is provided continuously to the clamping part 36. The fitting portion 38 </ b> A is provided corresponding to the recess 28 </ b> A and is located at the uppermost position of the annular portion 32.

  The fitting portion 38A has a wedge shape that is different from the other fitting portions 38B (which will be described later) and whose circumferential width becomes narrower toward the center direction. In the mounting operation of the fan cover 3, the shape of the fitting portion 38 </ b> A serves as an index for alignment of the fan cover 3 with respect to the opening 22 in the rotation direction. Using the shape of the fitting portion 38A as an index, the operator associates the fitting portion 38A with the recess 28A, and then fits the fitting portion 38A into the recess 28A.

  FIG. 5 is a cross-sectional view showing the mounting structure of the fan cover 3 when section A shown in FIG. 1 is cut along the vehicle longitudinal direction.

  FIG. 5 shows a state in which the fitting portion 38A is sufficiently fitted in the recess 28A. In this state, the position of the surface of the annular portion 32 substantially coincides with the position of the tip of the protruding portion 27. That is, based on the position of the surface of the annular portion 32 with respect to the position of the tip of the protrusion 27, it can be determined whether or not the fitting portion 38A has been sufficiently fitted into the recess 28A. It can be determined whether or not the position of the cover 3 in the rotational direction has been adjusted.

  6 is a partially enlarged perspective view of a portion B of the shroud 2 shown in FIG. If part A is located at a position of 0 °, part B is located at a position rotated by 120 ° from the position of 0 ° and a position rotated by 240 ° in the peripheral edge 24 of the opening 22. Yes.

  As shown in FIG. 6, the protrusion 27 in the B portion is provided with recesses 28B and 28C that are recessed in the center direction. The recesses 28B and 28C are symmetrical and have the same shape. Hereinafter, the recess 28B will be described as a representative. The circumferential width of the recess 28B gradually decreases from the entrance of the recess 28B toward the back. The circumferential width of the recess 28B is generally wider than the circumferential width of the recess 28A. Further, the depth of the recess 28B is shallower than the depth of the recess 28A.

FIG. 7 is an enlarged perspective view of a portion B of the fan cover 3 shown in FIG.
As shown in FIG. 7, at the front end of the annular portion 32, when the annular portion 32 is restored from the expanded diameter state to the reduced diameter state, the annular portion 32 is fitted into the recess 28 </ b> B to prevent the fan cover 3 from rotating relative to the opening 22. Fitting portions 38B and 38C are provided. The fitting portions 38B, 38C are symmetrical and have the same shape. Hereinafter, the fitting portion 38B will be described as a representative. The fitting portion 38B has a substantially rectangular shape with a constant circumferential width. Since the concave portion 28B is gradually narrowed from the entrance toward the back, the fitting portion 38B is fitted to the depth of the concave portion 28B having the same circumferential width as the circumferential width of the fitting portion 38B. Match.

  FIG. 8 is a cross-sectional view showing the mounting structure of the fan cover 3 when section B shown in FIG. 1 is cut along the vehicle longitudinal direction. FIG. 8 shows a state in which the fitting portion 38B is fitted in the recess 28B. The state in which the fitting portion 38B is fitted in the recess 28B and the state in which the fitting portion 38C is fitted in the recess 28C are the same. Hereinafter, the state in which the fitting portion 38B is fitted in the recess 28B will be described as a representative. In this state, the position of the surface of the annular portion 32 substantially coincides with the position of the tip of the protruding portion 27. That is, based on the position of the surface of the annular portion 32 with respect to the position of the tip of the protrusion 27, it can be determined whether or not the fitting portion 38B is sufficiently fitted into the recess 28B.

Next, the fan cover mounting operation will be described.
First, the operator determines the position of the fan cover 3 in the rotation direction with respect to the opening 22 so that the fitting portion 38A and the recess 28A correspond to each other using the wedge-shaped fitting portion 38A as an index.

  Next, the fitting portion 38A is fitted into the concave portion 28A, and the sandwiching portion 36 is fitted to the convex strip portion 26 so that the convex strip portion 26 is sandwiched from the front and rear direction by the sandwiching portion 36 in and around the portion A. Let

  Next, the operator holds the annular portion 32 from the A portion toward the B portion while extending the annular portion 32 in the circumferential direction against the restoring force and restoring the annular portion 32 as necessary. Are fitted into the ridge 26.

  Even if the fitting part 38B is displaced from the recessed part 28B in the B part, since the inlet of the recessed part 28B is wider than the width of the fitting part 38B, the fitting part 38B can be fitted to the inlet of the recessed part 28B. Moreover, the fitting part 38B and the recessed part 28B can be matched by fitting the fitting part 38B in the back of the recessed part 28B. The same operation as the above-described operation of fitting the fitting portion 38B into the concave portion 28B is also performed for the operation of fitting the fitting portion 38C into the concave portion 28C. Thereby, the fan cover 3 is attached to the shroud 2.

  Whether or not the sandwiching portion 36 is sufficiently fitted to the protruding portion 26 and whether or not the fitting portion 38B is sufficiently fitted to the recessed portion 28B is determined by the annular portion 32 with respect to the position of the tip of the protruding portion 27. What is necessary is just to judge based on the position of the surface.

  When the fan cover 3 is attached, the fitting portion 38A is fitted into the recess 28A, the fitting portion 38B is fitted into the recess 28B, and the fitting portion 38C is fitted into the recess 28C. For example, the fan cover 3 does not rotate around the opening 22 and the rotation is prevented.

  In the fan cover 3 mounting structure according to the above embodiment, the fitting portion 38A is fitted into the recess 28A, the fitting portion 38B is fitted into the recess 28B, and the fitting portion 38C is fitted into the recess 28C. Thus, it is possible to prevent the fan cover 3 from being accompanied.

  Further, the direction in which the sandwiching portion 36 is fitted to the convex strip portion 26 and the direction in which, for example, the fitting portions 38A (38B, 38C) located in the vicinity thereof are fitted to the concave portion 28A (28B, 28C) are the same central direction. Therefore, the fan cover 3 can be easily attached.

  Further, since the protrusions 27 are provided in parallel with the ridges 26, the protrusions 27 guide the nips 36 toward the center when the nips 36 are fitted to the ridges 26. From this point, the mounting workability of the fan cover 3 can be improved.

  Furthermore, since the fitting portion 38A has a different shape from the other fitting portions 38B, 38C, the rotation direction of the fan cover 3 with respect to the opening 22 of the shroud 2 can be easily aligned using the fitting portion 38A as an index. Can do.

  Further, since the circumferential widths of the recesses 28A, 28B, and 28C are gradually narrowed from the inlet toward the back, the fitting portion 38A and the recess 28A are maintained in a predetermined positional relationship, and the fitting is performed. The joint portion 38B and the concave portion 28B are kept in a predetermined positional relationship, the fitting portion 38C and the concave portion 28C are kept in a predetermined positional relationship, and as a result, the fan cover 3 can be attached to an appropriate position. it can.

  Furthermore, since the locked portion 361 of the holding portion 36 is locked to the hook portion 261 of the protruding portion 26, even if a centrifugal load is applied to the fan cover 3, the holding portion 36 is fixed to the protruding portion 26. Can be prevented from coming off.

  In the above embodiment, the shroud 2 is provided with a plurality of recesses 28A, 28B, and 28C, and the plurality of fitting portions 38A, 38B, and 38C that are fitted thereto are provided in the fan cover 3. Not limited to this. For example, one recess may be provided in the shroud 2 and one fitting portion that fits into the recess may be provided in the fan cover 3.

  In the above embodiment, the protrusion 27 is provided on the peripheral edge 24 of the opening 22 of the shroud 2 and the recesses 28A, 28B, and 28C are provided on the protrusion 27. However, the present invention is not limited to this. For example, both wall portions having a predetermined gap in the circumferential direction may be provided on the peripheral edge 24, and the gap may be a recess.

  In addition, each of the above-described embodiments is merely an example of a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

DESCRIPTION OF SYMBOLS 1 Radiator 2 Shroud 3 Fan cover 22 Opening part 24 Periphery 26 Projection part 27 Projection part 28A, 28B, 28C Concave part 32 Annular part 36 Clamping part 38A, 38B, 38C Fitting part

Claims (3)

A shroud is arranged on the rear side of the radiator, an opening for guiding the airflow from the radiator to the rear is provided in the shroud, a fan for cooling the radiator is arranged at a rear position of the opening, and an annular portion surrounding the fan In a fan cover mounting structure in which a fan cover having
The shroud is
A ridge that is provided along the circumferential direction of the periphery of the opening, and protrudes in a centrifugal direction opposite to the central direction of the opening;
A recess provided on the front side of the ridge, and recessed in the central direction;
Have
The annular portion is
It has a restoring force to restore the expanded diameter state of the ring from the expanded state to the reduced diameter state of the ring,
It is provided along the circumferential direction of the annular part, and in the reduced diameter state, the convex part is fitted to the convex part so as to sandwich the convex part from the front and back, and the fan cover moves forward and backward relative to the opening. A clamping part to prevent,
A fitting portion that is provided in the annular portion and fits in the recess in the reduced diameter state to prevent rotation of the fan cover with respect to the opening;
Having
Fan cover mounting structure. The annular portion has a plurality of fitting portions,
The fan cover mounting structure according to claim 1, wherein one of the plurality of fitting portions has a shape different from that of the other fitting portions.   The fan cover mounting structure according to claim 1, wherein a width of the concave portion in the circumferential direction is gradually narrowed toward the central direction.

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