JP2016121574A - On-vehicle radiator fan shroud - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent moisture from being frozen at a lower end of an inner cylinder of an on-vehicle radiator fan shroud having a ring-fan attached and also prevent some foreign materials from striking against the ring fan.SOLUTION: A ventilation guide part 16 of a fan shroud 1 is formed by an inner cylinder part 17 positioned outside a ring fan 2, a circular plate part 18 and an intermediate cylinder part 19. The ventilation guide part 16 is provided with a water drain hole 22 cut and opened to have an opening in a flowing direction of cooling air and a pocket-like lower cover part 23 for covering the drain hole 22 from below. Water droplets flowing down along inner peripheral surfaces of the inner cylinder part 17 and the intermediate cylinder part 19 drip down from the water drain hole 22 onto the lower cover part 23 and then they are discharged outside. Due to this fact, after stopping an engine, it is possible to prevent phenomenon in which water droplets are frozen to cause the ring fan 2 and the fan shroud 1 to be connected. Immersion of foreign materials 27 is prevented by the lower cover part 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fan shroud used as a set with a radiator mounted on a vehicle.

  The vehicular internal combustion engine includes a radiator for cooling the cooling water, and the radiator is cooled by wind of a fan driven by a motor (also cooled by running wind). The fan is fixed to the rotating shaft of the fan motor, and the fan motor is mounted on a resin fan shroud. That is, the cooling unit includes a fan shroud, a fan motor, and a fan.

  The outer shape of the fan shroud is approximately the same square as the radiator, and there is a circular ventilation hole in which the fan is placed inside, and there are many motor support parts for fixing the fan motor in the center of the ventilation hole. It is arranged through the rib of the book.

  Radiator fans include a propeller fan in which the blades are arranged radially and a ring fan in which the ring part is integrally connected to the tip of the blade group. The ring fan is excellent in strength and quietness. There are advantages.

  The fan shroud used as a set with the ring fan has an inner cylinder part in the inner periphery of the ventilation hole, so that there is a slight gap between the inner cylinder part of the fan shroud and the ring part of the ring fan. Is set to This gap is preferably as small as possible. However, in the case of an on-vehicle fan shroud, if the outside air temperature is low, such as in a cold district, the water droplets that have fallen to the lower end of the inner cylinder will freeze after the operation of the internal combustion engine stops, The shroud and the ring fan were sometimes joined by ice.

  In this regard, Patent Document 1 discloses that a downward recess (step) is formed at the lower end of the inner cylinder portion (fan shroud ring portion), and a porous member is disposed at the step. Patent Document 1 describes that water droplets pass through a porous material and are discharged to the outside.

JP 2007-177625 A

  In Patent Document 1, it is assumed that water droplets pass through the porous material. However, since the flow may be hindered by capillary action, for example, when the amount of water droplets is large such as during rainy weather, the water flows down. There is a concern that the ring fan and fan shroud may be frozen by being frozen before cutting. In addition, since the porous material cannot prevent dust from accumulating over time, there is a high possibility that the function of flowing water will be impaired during use.

  The present invention has been made to improve the current situation.

  The present invention includes an inner cylinder portion surrounding a ring fan attached to a rotating shaft of a fan motor, and a motor support portion to which the motor is fixed, and the radiator is cooled by cooling air generated by the ring fan. The present invention relates to a fan shroud for in-vehicle radiators, and the fan shroud has a drain hole that allows water droplets attached to the inner periphery of the inner cylinder part to flow down to the lower end of the inner cylinder part, and the drain hole from below. A lower cover portion for covering is provided, and the lower cover portion is provided with an opening portion for horizontally discharging water droplets flowing down from the drain hole.

  The opening may be opened on the entire outer periphery, or may be opened only on the front side, only on the rear side, or both front and rear in the direction of the cooling air flow. Or it is also possible to make it open to the right-and-left both sides (or one side) which faced the flow direction of cooling air. However, from the viewpoint of blowing off water droplets with cooling air, it is preferable to open the front side or both front and rear sides in the cooling air flow direction. The drainage hole includes both a closed method and a slitting method.

  In the present invention, in the fan shroud in which the ring fan is arranged, since a drain hole is provided at the lower end of the inner cylinder portion, water drops that have fallen along the inner peripheral surface of the inner cylinder portion flow down to the drain hole, Excluded from the opening of the lower cover part. Therefore, even if the amount of water droplets is large, this can be appropriately eliminated, and the phenomenon that the fan shroud and the ring fan are joined due to freezing can be accurately prevented. If the drain hole is made a certain size, the drain hole will not be clogged with dust, so that the freeze prevention function will not deteriorate over time.

  In most cases, the engine room of the vehicle is opened downward. For this reason, a foreign object such as a stone grain may jump up and hit the fan shroud. Since the foreign matter flying away is guarded by the lower cover portion, it is possible to prevent the foreign matter from hitting the ring fan during traveling or being caught between the ring fan and the fan shroud.

  Forming the water drain hole in a cut shape has the advantage of further improving the function of removing water droplets, and is easy to mold. In addition, when the opening of the lower cover part is opened forward or both front and rear in the flow direction of the cooling air, not only the water droplet removal function can be further improved as described above, but also the generation of vortex is prevented or suppressed. Generation of noise can be prevented or greatly suppressed. Furthermore, since the lower cover portion is formed in a pocket shape and is connected to the inner cylinder portion, it is possible to prevent the strength of the fan shroud from being reduced (or the strength can be increased by the rib effect).

It is a front view of the fan shroud which concerns on embodiment. (A) is a sectional view taken along the line IIA-IIA in FIG. 1, (B) is a partially enlarged view of (A), and (C) is another example. It is an enlarged front view of the principal part. It is a perspective view of the principal part.

(1). First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. The fan shroud 1 is made of resin, and as shown in FIG. 1, the fan shroud 1 basically has a rectangular outer shape when viewed from the front facing the cooling air flow direction. The circular ventilation hole 3 which arranges is vacant. A pair of left and right radiator mounting portions 5 are projected from the upper and lower ends of the base portion 4 constituting the outside of the ventilation hole 3.

  The direction indicated by the white arrow in FIG. 2 (A) indicates the forward direction of the vehicle. As schematically shown in FIG. 2 (A), the radiator is the state of the fan shroud 1 in the state of FIG. 2 (A). Arranged on the right side. That is, the wind that has passed through the radiator is sucked by the ring fan 2.

  A ring-shaped motor support portion 6 is disposed at the center of the ventilation hole 3, and the motor support portion 6 and the base portion 4 are connected by a large number of ribs 7 disposed in the circumferential direction. As shown in FIG. 2A, the motor support portion 6 is formed in an L-shaped cross section having a cylindrical portion and a disc-like portion, and the fan motor 8 is attached to the bracket 9 on the disc-like portion. It is fixed with a screw 10 via.

  As shown in FIG. 2A, the ring fan 2 includes a cup-shaped center member 11 fixed to a rotation shaft (not shown) of the fan motor 8, a plurality of blades 12 extending radially from the center member 11, and blades A ring cylinder 13 integrally connected to the tip (outer peripheral end) of the group of 12, and a disc-like shape is formed on the front end of the ring cylinder 13 facing the cooling air flow direction X. The rib 14 is provided integrally. Accordingly, the ring portion 15 has an L-shaped cross section.

  A generally cylindrical ventilation guide portion 16 is integrally formed on the inner periphery of the base portion 4. The ventilation guide portion 16 is located on the outer peripheral outer side of the rib portion 14 of the ring fan 2, the inner tube portion 17 parallel to the ring tube portion 13 of the ring fan 2, the disk-like portion 18 parallel to the rib 14 of the ring fan 2. The intermediate cylinder portion 19 is continuous with the intermediate cylinder portion 19. For this reason, the part located in the outer periphery outer periphery of the ring fan 2 among the ventilation guide parts 16 becomes a cross-sectional shape which curves in a crank shape and changes a diameter.

  Further, the ventilation guide portion 16 has an intermediate cylinder portion 19 that is curved in the cooling air flow direction X and is loosely expanded in diameter and connected to the disk-like portion 19. The disc-shaped base portion 4 is integrally connected to the outer peripheral edge of the intermediate cylinder portion 19. Accordingly, the inner diameter of the ventilation guide portion 16 is gradually reduced toward the direction X of the cooling air flow.

  At the lower end of the inner cylinder portion 17 in the fan shroud 1, there is a water drain hole 22 having a size that allows water droplets to flow down reliably. The drain hole 22 extends to the base portion 4 through the disk-shaped portion 18 and the intermediate cylinder portion 19. Needless to say, the drain hole 22 may be formed only in the inner cylinder portion 17 or may be formed in the inner cylinder portion 17 and the disk-shaped portion 18.

  A lower cover portion 23 surrounding the drain hole 22 from below is integrally connected to the inner cylindrical portion 17, the disk-shaped portion 18, the intermediate cylindrical portion 19, and the base portion 4. The lower cover portion 23 has left and right side walls 23 a that protrude to the inner peripheral position of the base portion 4, and a bottom plate 23 b that is connected to the lower ends of the left and right side walls 23 a, and the bottom plate 23 b reaches the base portion 4. Therefore, the lower cover portion 23 has a generally U-shaped pocket shape as viewed from the front, and the opening portion 24 opens toward the downstream side in the flow direction X of the cooling air.

  Therefore, the lower cover portion 23, the inner cylindrical portion 17, the disk-shaped portion 18, the intermediate cylindrical portion 19, and the base portion 4 form a pocket-shaped portion that opens forward (for this reason, the lower cover portion 23 is (It can also be called a bouquet part.)

  The drain hole 22 extends to the base portion 4, but does not reach the bottom plate 23b of the lower cover portion 23. Therefore, there is a slight gap between the front end 22a of the drain hole 22 and the back end of the bottom plate 23b. Is open. For this reason, the water drop dripping on the bottom plate 23b of the lower cover part 23 flows down to the opening 24 side without falling down. Therefore, the inner peripheral edge of the base portion 4 also functions as a barrier plate that prevents water droplets from flowing down to the opposite side of the opening portion 24 even at the drain hole 22.

  The drainage hole 22 opens backward, the lower cover portion 23 opens forward, and the bottom plate 23b reaches the base portion 4. Therefore, the fan shroud 1 is a pair of molds that can be closely separated from each other. Can be molded (no slide mold is required).

  The base portion 4 and the inner cylinder portion 17 are connected by a reinforcing rib 25. Further, the lower cover portion 23, the base portion 4, and the inner cylinder portion 17 are also connected by a reinforcing rib 26.

  In the above configuration, water droplets adhering to the inner peripheral surface of the inner cylinder portion 17 in the fan shroud 1 flow downward from the drain hole 22 and flow down from the opening 24 of the lower cover portion 23. Accordingly, it is possible to prevent the occurrence of a situation in which water drops freeze after the engine is stopped and the ring fan 2 is connected to the inner cylinder portion 17 and the intermediate cylinder portion 19. In the embodiment, since the lower cover part 23 plays the role of a reinforcing rib, it can contribute to the strength improvement of the fan shroud 1.

  Further, since the lower cover portion 23 has a bottom plate 23 b, even if a foreign object 27 such as a pebbles jumps up during traveling, the foreign object 27 hits the ring fan 2 or between the ring fan 2 and the inner cylinder portion 17. There is no biting. If the lower cover part 23 is formed in a pocket shape having left and right side walls 23a as in this embodiment, there is an advantage that the guard function of the foreign matter 27 is further enhanced. In the embodiment, the left and right lateral width of the lower cover portion 23 in front view is much larger than the left and right lateral width of the drain hole 22, but if configured in this way, the foreign matter 27 enters the drain hole 22. The entry can be prevented more reliably.

  When the opening 25 is opened toward the downstream side in the flow direction of the cooling air as in the embodiment, it is preferable that water droplets adhering to the inside of the lower cover portion 23 can be blown off by the cooling air during traveling. . If the drainage hole 22 is formed in a shape that is cut and opened in the disk-shaped part 18, the intermediate cylinder part 19, and the base part 4, the flow of the wind is improved, so that the water droplet blowing action is excellent.

  In addition, since the cooling air that has entered the drain hole 22 blows out quickly from the lower cover portion 23, it is possible to prevent the occurrence of backflow and vortex flow and to suppress noise. In addition, backflow of cooling air can be prevented. Moreover, since the lower cover part 23 functions as a rib, it can also contribute to the strength improvement of the fan shroud 1.

  In the modification shown in FIG. 2C, the bottom plate 23b of the lower cover portion 23 is inclined so as to become lower toward the downstream side of the cooling air. If comprised in this way, exclusion of a water droplet can be further ensured. In this example, the bottom plate 23b has a thick wall without forming a void 23c that opens in a direction opposite to the flow direction of the cooling air at the location of the bottom plate 23b without impairing the ease of die cutting during molding. Is prevented.

  In addition to the above, the present invention can be embodied in various ways. For example, the number of drain holes is not limited to one, and a plurality of drain holes can be provided. In the case where a plurality of lower cover portions are provided, a plurality of lower cover portions may be provided corresponding to the drain holes, and the plurality of drain holes may be covered from below by one lower cover portion. In the present invention, the entire drain hole may be covered with the lower cover part, or there may be a part partially removed from the lower cover part as in the embodiment. However, it is preferable that the part provided in the inner cylinder part is entirely covered with the lower cover part from below.

DESCRIPTION OF SYMBOLS 1 Fan shroud 2 Ring fan 3 Ventilation hole 4 Base part 5 Radiator attachment part 6 Motor support part 8 Fan motor 12 Blade 13 Ring cylinder part 14 Rib 15 Ring part 16 Ventilation guide part 17 Inner cylinder part 18 Disk-shaped part 19 Intermediate cylinder Part 20 Taper part 21 Notch 22 Drain hole 23 Lower cover part 23a Side wall 23b Bottom plate 23c Front wall 24 Opening part

Claims (1)

An on-vehicle radiator fan having an inner cylinder portion surrounding a ring fan attached to a rotating shaft of a fan motor and a motor attachment portion to which the motor is fixed, and the radiator being cooled by cooling air generated by the ring fan A shroud,
The lower end of the inner cylinder part is provided with a drain hole that allows water droplets attached to the inner periphery of the inner cylinder part to flow down, and a lower cover part that covers the drain hole from below. Is provided with an opening for horizontally discharging water droplets flowing down from the drain hole,
Fan shroud for in-vehicle radiators.

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