JP2007303286A - Contra-rotating blower for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contra-rotating blower for a vehicle capable of suppressing the entry of foreign matters into a gear part by connecting a rotating drive shaft of a motor and a rotary shaft of an axial flow fan through the medium of a gear when rotating and driving a plurality of axial flow fans with one motor. <P>SOLUTION: A rotating drive shaft 21 of a motor 2 and a rotary shafts 11a, 12a of axial flow fans 11, 12 are coupled to each other through the medium of gears 11f, 12f, 22, respectively. The gears 11f, 12f, 22 are accommodated in a gear box 5. Two axial fans 11, 12 are provided with boss parts 11b, 12b having recesses and blades 11c, 12c included in the boss parts 11b, 12b, and arranged so that the recesses of the boss parts 11b, 12b face each other. The gear box 5 is arranged between the boss parts 11b, 12b and covered by the boss parts 11b, 12b from both sides of an air flow direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blower using an axial fan (see JIS B 0132 number 1010), and is effective when applied to a blower that blows cooling air to a vehicle heat exchanger such as a radiator.

Conventionally, an axial fan has been used as a blower for supplying cooling air to a heat exchanger such as a radiator mounted on a vehicle (see, for example, Patent Document 1). However, the axial flow fan has a problem that the dynamic pressure component of the swirl component accompanying the rotation is lost and the axial flow component is reduced, so that the fan efficiency is deteriorated.
JP 2002-310097 A

  On the other hand, the present applicant is considering using a counter rotating fan as a blower mounted on a vehicle. The counter-rotating fan has two axial fans arranged opposite to each other, and the two axial fans rotate in opposite directions to blow air. Since the swirling component generated at the outlet of one axial fan is canceled by the reversal of the other axial fan, the dynamic pressure component of the swirling component generated at the outlet of one axial fan can be recovered as a static pressure. it can. Thereby, fan efficiency can be improved.

  By the way, as a method of rotationally driving the counter rotating fan, a method of providing one motor for each axial fan can be considered. In this method, since two motors are required for one counter-rotating fan, there are problems such as an increase in the number of parts and an increase in weight.

  Therefore, the present applicant has devised a method of rotating and driving two axial fans with one motor by connecting the rotation drive shaft of the motor and the rotation shaft of the axial fan through a gear. However, since the counter-rotating fan is mounted on the vehicle, foreign matters such as water, stepping stones, and dust may enter the gear portion, which may adversely affect the rotation function of the gear.

  In view of the above points, the present invention provides a gear portion when a plurality of axial fans are rotationally driven by a single motor by connecting the rotational drive shaft of the motor and the rotational shaft of the axial fan via a gear. An object of the present invention is to provide a contra-rotating blower for a vehicle that can suppress entry of foreign matter into the vehicle.

  In order to achieve the above object, in the present invention, two axial fans (11, 12) that are mounted on a vehicle and rotate in opposite directions to each other, and motors that rotationally drive the two axial fans (11, 12) ( 2), and the two axial flow fans (11, 12) are vehicle counter-rotating fans arranged in series so that their rotating shafts (11a, 12a) are on the same straight line, The rotational drive shaft (21) of the motor (2) and the rotational shafts (11a, 12a) of the two axial fans (11, 12) are connected via gears (11f, 12f, 22), respectively. The gears (11f, 12f, 22) are accommodated in the gear box (5), and the two axial fans (11, 12) include a boss part (11b, 12b) having a recess and a boss part (11b, 12b) blades (11c, 12) ), The two axial fans (11, 12) are arranged so that the recesses of the bosses (11b, 12b) face each other, and the gear box (5) The first feature is that it is disposed between the boss portions (11b, 12b) and is covered with the two boss portions (11b, 21b) from both sides in the air flow direction.

  Thus, the gears (11f, 12f, 22) are accommodated in the gear box (5), and the gear box (5) is covered with the boss portions (11b, 12b) from both sides, so that the gears (11f, 12f, 22) are covered. ) Can be prevented from entering foreign matter.

  In this case, the rotational drive shaft (21) is arranged between the two axial fans (11, 12), the main drive side gear (22) is connected to the rotational drive shaft (21), and the two axial fans ( 11, 12) are arranged perpendicularly to the rotational drive shaft (21), and meshed with the main gear (22) at one end of the rotational shaft (11a, 12a). The driven gears (11f, 12f) are respectively connected, and the driven gears (11f, 12f) of the two axial fans (11, 12) can be rotated in opposite directions by the driven gear (22). .

  The second feature of the present invention is that the gap (A) between the end of the boss (11b, 12b) and the rotary drive shaft (21) is in the range of more than 0 and not more than 10 mm.

  As a result, the gear box (A) between the end of the boss portion (11b, 12b) and the rotation drive shaft (21) passes through the gap with the rotation drive shaft (21) in the gear box (5). 5) It can suppress that a foreign material penetrate | invades in. For this reason, it is possible to suppress the entry of foreign matter into the gears (11f, 12f, 22).

  Then, the clearance (A) between the end of the boss portion (11b, 12b) and the rotation drive shaft (21) is set in the range of 3 mm or more and 6 mm or less, so that the foreign matter to the gear (11f, 12f, 22) While suppressing intrusion, it is possible to prevent the rotational drive shaft (21) and the boss portions (11b, 12b) from coming into contact with each other due to a deviation due to assembly accuracy or dimensional accuracy, thereby causing a malfunction in the rotational function.

  The third feature of the present invention is that the gap (B) between the boss portions (11b, 12b) and the gear box (5) is in the range of more than 0 and not more than 10 mm.

  As a result, even if foreign matter enters between the gear box (5) and the bosses (11b, 12b), the gap between the gear box (5) and the rotation shafts (11a, 12a) It is possible to prevent foreign matter from entering the door. For this reason, it is possible to suppress the entry of foreign matter into the gears (11f, 12f, 22).

  And the clearance (B) of a boss | hub part (11b, 12b) and a gear box (5) is made into the range of 3 mm or more and 6 mm or less, and the penetration | invasion of the foreign material to a gear (11f, 12f, 22) is suppressed. On the other hand, it is possible to prevent the boss portions (11b, 12b) and the gear box (5) from coming into contact with each other due to a deviation due to assembly accuracy or dimensional accuracy, and to cause a malfunction in the rotation function.

  Moreover, in this invention, between the boss | hub part (11b, 12b) and a gear box (5), the annular | circular shape which protrudes toward one side from the other among a boss | hub part (11b, 12b) and a gear box (5). A fourth feature is that a maze structure is formed by providing at least one protrusion (110, 120, 510).

  As is well known, the “maze structure” means that at least one portion where the passage is bent is provided in a portion extending from the entrance side to the exit side of the passage so that the fluid flowing through the passage flows linearly. It is something that cannot be done.

  As a result, even if foreign matter enters between the gear box (5) and the bosses (11b, 12b), the gap between the gear box (5) and the rotation shafts (11a, 12a) It is possible to prevent foreign matter from entering the door. For this reason, it is possible to suppress the entry of foreign matter into the gears (11f, 12f, 22).

  In this case, the boss portion (11b, 12b) is provided with an annular first labyrinth wall (110, 120) protruding toward the gear box (5), and the boss portion (11b, 12b) is provided on the gear box (5). An annular second maze wall (510) protruding sideways is provided concentrically with a different diameter from the first maze wall (110, 120), and the maze structure is formed with the first maze wall (110, 120). , And the second maze wall (510).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the present embodiment, the present invention is applied to a blower that blows cooling air to a radiator and a condenser (hereinafter also referred to as a heat exchanger) mounted on a vehicle. The radiator is a heat exchanger that cools the cooling water by exchanging heat between the cooling water and air of the engine (internal combustion engine), and the condenser is a refrigerant and air that circulates in the refrigeration cycle (air conditioner) for the vehicle. Is a heat exchanger that cools the refrigerant by exchanging heat with each other. In the present embodiment, the radiator is disposed on the vehicle rear side from the capacitor.

  FIG. 1 is an exploded perspective view showing a counter-rotating blower 1 and a fan shroud 3 according to the present embodiment. As shown in FIG. 1, two counter-rotating blowers 1 of the present embodiment are arranged in parallel on the vehicle rear side of a heat exchanger (not shown). The two counter-rotating blowers 1 are rotationally driven by a single motor 2.

  A fan shroud 3 is disposed on the vehicle rear side of a heat exchanger (not shown). The fan shroud 3 has a function of blocking the gap between the counter-rotating fan 1 and the heat exchanger and preventing the air flow induced by the counter-rotating fan 1 from flowing around the heat exchanger. And a function of supporting the counter-rotating blower 1.

  The fan shroud 3 includes a cylindrical (ring-shaped) shroud ring portion 31 and a shroud plane portion 32 that connects a space on the back side of a radiator (not shown) to the ring portion 31 by a smooth flow path. Yes. And in this embodiment, each part, such as the shroud ring part 31 and the shroud plane part 32, is formed so that all may be united.

  The shroud ring part 31 forms a venturi-type flow path space in which the counter rotating fan 1 can freely rotate leaving a gap of a necessary size at the tips of blades 11c and 12c described later. Among them, the counter-rotating blower 1 is supported and rotated by rotating shafts 11a and 12a of a gear box 5 described later. In the present embodiment, since the two counter rotating fans 1 are arranged in parallel, the shroud ring portion 31 is also formed in parallel so as to correspond to the counter rotating fan 1. In addition, the motor 2 is fixed to the rear side of the shroud plane portion 32 (on the downstream side of the air flow) via a bracket 4.

  Next, a specific configuration of the counter-rotating blower 1 in the present embodiment will be described. Since the configuration of the two counter rotating fans 1 is substantially the same, the counter rotating fan 1 on the side close to the motor 2 will be described here.

  FIG. 2 is a cross-sectional view of the counter-rotating blower 1 according to the present embodiment. As shown in FIG. 2, the counter-rotating blower 1 of the present embodiment includes a first axial fan 11 and a second axial fan 12. The first axial fan 11 and the second axial fan 12 are arranged in series with each other, that is, so that the rotating shafts 11a and 12a are on the same straight line. Further, the first axial fan 11 is disposed on the vehicle front side (air flow upstream side) of the second axial fan 12.

  The first axial fan 11 and the second axial fan 12 are configured to rotate in opposite directions. Further, in the first axial flow fan 11 and the second axial flow fan 12, the direction of the induced air flow is the same.

  As a result, the swirl component in the circumferential direction generated at the outlet of the first axial fan 11 is canceled by the reversal of the second axial fan 12, so that it is generated at the outlet of the first axial fan 11. The dynamic pressure component of the swirling flow is recovered as a static pressure. For this reason, since a high static pressure is obtained compared with a series of normal axial fans, the amount of air blown to a heat exchanger (not shown) can be increased.

  The first and second axial fans 11 and 12 have a plurality of blades 11c and 12c extending radially from the boss portions 11b and 12b, respectively. The boss portions 11b and 12b are formed in a cylindrical shape with one end closed, that is, in a substantially U-shaped cross section, and have a circular bottom portion 11d and 12d and a side wall projecting from the edge of the bottom portions 11d and 12d at a substantially right angle. Parts 11e and 12e. One end sides of the rotating shafts 11a and 12a are connected to the center of the bottom 11d. Blades 11c and 12c are connected to the outer surfaces of the side walls 11e and 121e. The first and second axial fans 11 and 12 are formed so that the substantially U-shaped concave portions of the boss portions 11b and 12b face each other, that is, the end portions of the side wall portions 11e and 12e face each other. Is arranged.

  Moreover, the main drive side gear 22 is being fixed to the site | part corresponding to the two counter rotating type blowers 1 in the rotational drive shaft 21 of the motor 2 (refer FIG. 1), respectively. For example, a helical gear or a bevel gear is used as the main drive side gear 22.

  The rotary shafts 11 a and 12 a of the first and second axial fans 11 and 12 are arranged perpendicular to the rotary drive shaft 21 of the motor 2, respectively. The driven gears 11f and 12f are fixed to the other ends of the rotating shafts 11a and 12a (ends not connected to the boss portions 11b and 12b), respectively. The driven gears 11f and 12f are respectively meshed with the main driving gear 22, whereby the rotational driving force of the motor 2 is transmitted to the rotary shafts 11a and 12a of the first and second axial fans 11 and 12, respectively. The first and second axial fans 11 and 12 are configured to rotate in opposite directions. As the driven gears 11f and 12f, gears such as a helical gear and a bevel gear are appropriately used.

  The rotation shafts 11a and 12a of the first and second axial fans 11 and 12 are rotatably supported by the gear box 5 via bearings 11g and 12g. This gear box 5 accommodates the driven gears 22 as well as the driven gears 11f and 12f, and supports the rotary drive shaft 21 via the bearings 23 in the same manner as the rotary shafts 11a and 12a. .

  Returning to FIG. 1, the gear box 5 is attached to a stay 33 that extends across the fan shroud 3 substantially horizontally. In the present embodiment, two stays 33 are provided in parallel so as to support the vehicle upper and lower ends of the gear box 5.

  Next, detailed configurations of the first and second axial fans 11 and 12 and the gear box 5 in the present embodiment will be described.

  As shown in FIGS. 1 and 2, the gear box 5 is formed in a substantially cylindrical shape. The gear box 5 is disposed between the boss portions 11b and 12b of the two axial fans, and is covered with the boss portions 11b and 12b from both sides in the air flow direction. Here, the circular surface facing the bottom portions 11d and 12d of the boss portions 11b and 12b in the gear box 5 is referred to as a first surface 51, and the surfaces facing the side wall portions 11e and 12e of the boss portions 11b and 12b are first surfaces. The second surface 52 is called.

  As shown in FIG. 2, annular first labyrinth walls 110 and 120 projecting toward the first surface 51 of the gear box 5 are formed on the bottoms 11 d and 12 d of the boss portions 11 b and 12 b. The first labyrinth walls 110 and 120 are arranged substantially concentrically with the bottom portions 11d and 12d, that is, in a circular shape around the rotation shafts 11a and 12a.

  On the other hand, an annular second maze wall 510 is formed on the first surface 51 of the gear box 5 so as to protrude toward the boss portions 11 b and 12. The second maze wall 510 is arranged in a circular shape centering on the point where the first surface 51 of the gear box 5 and the rotation shafts 11a and 12a intersect. That is, the first maze walls 110 and 120 and the second maze wall 510 are arranged concentrically. The second maze wall 510 is smaller in diameter than the first maze walls 110 and 120. The first and second maze walls 110, 120, and 510 constitute a maze structure.

  Further, the smaller the gap A between the rotary drive shaft 21 and the end portions of the side walls 11e and 12e of the boss portions 11b and 12b, the smaller the gap A from the rotary drive shaft 21 in the gear box 5 is. Thus, foreign matter such as water, stepping stones and dust can be prevented from entering the gear box 5. However, if the gap A is made small, the rotational drive shaft 21 and the boss portions 11b and 12b come into contact with each other due to a deviation due to assembly accuracy or dimensional accuracy, and there is a possibility that a malfunction occurs in the rotation function. For this reason, the gap A is preferably in the range of greater than 0 to 10 mm or less, and more preferably in the range of 3 mm to 6 mm.

  Further, as the size of the gap B between the boss portions 11b and 12b and the gear box 5 is reduced, the foreign matter enters the gear box 5 from the gap B through the gap between the rotation shafts 11a and 12a in the gear box 5. Can be prevented from entering. However, if the gap B is reduced, the boss portions 11b and 12b and the gear box 5 may be brought into contact with each other due to a deviation due to assembly accuracy or dimensional accuracy, which may cause a malfunction in the rotation function. For this reason, the gap B is preferably in the range of greater than 0 to 10 mm or less, and more preferably in the range of 3 mm to 6 mm.

  As described above, the driving side gear 22 and the driven side gear 11f are accommodated in the gear box 5 by covering the driving side gear 22 and the driven side gears 11f and 12f with the boss portions 11b and 12b. , 12f can be prevented from entering foreign matter.

  Further, by forming a maze structure between the boss portions 11b and 12b and the gear box 5, it is possible for foreign matter to enter the gear box 5 through a gap between the rotation shafts 11a and 12a in the gear box 5. Can be suppressed. For this reason, it becomes possible to further suppress the entry of foreign matter into the main driving gear 22 and the driven gears 11f and 12f.

(Other embodiments)
In the above embodiment, the two counter rotating fans 1 are arranged in parallel. However, the present invention is not limited to this, and when only one counter rotating fan 1 is arranged, or when the counter rotating fan 1 is three. The present invention can be applied even when two or more are arranged.

  Moreover, in the said embodiment, although the maze structure between the boss | hub parts 11b and 12b and the gear box 5 was formed by providing the two maze walls 110, 120, 510, it is not restricted to this, A maze wall is 1 Only one or three or more may be provided.

  Moreover, in the said embodiment, although the motor 2 was fixed to the fan shroud 3 via the bracket 4, and the gear box 5 was fixed to the fan shroud 3 via the stay 33, it is not restricted to this, respectively fan shroud 3 You may fix it directly.

  In the above embodiment, the second maze wall 510 is configured to have a diameter smaller than that of the first maze wall 110, 120. However, the diameter is not limited to this, and the diameter is larger than that of the first maze wall 110, 120. You may comprise so that it may become large.

1 is an exploded perspective view showing a counter-rotating blower 1 and a fan shroud 3 according to an embodiment of the present invention. 1 is a cross-sectional view of a counter-rotating blower 1 according to an embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Motor, 5 ... Gear box, 11, 12 ... Axial fan, 11a, 12a ... Rotary shaft, 11b, 12b ... Boss part, 11c, 12c ... Blade, 11f, 12f ... Drive side gear, 21 ... Rotation drive shaft , 22 ... main drive side gear.

Claims (8)

Two axial fans (11, 12) that are mounted on a vehicle and rotate in opposite directions, and a motor (2) that rotationally drives the two axial fans (11, 12). The flow fan (11, 12) is a counter-rotating blower for a vehicle arranged in series so that its rotation shafts (11a, 12a) are on the same straight line,
The rotation drive shaft (21) of the motor (2) and the rotation shafts (11a, 12a) of the two axial fans (11, 12) are connected via gears (11f, 12f, 22), respectively. And
The gears (11f, 12f, 22) are housed in a gear box (5),
The two axial fans (11, 12) have bosses (11b, 12b) having recesses and blades (11c, 12c) provided on the bosses (11b, 12b), respectively. ,
The two axial fans (11, 12) are arranged such that the concave portions of the boss portions (11b, 12b) face each other.
The gear box (5) is disposed between the two boss portions (11b, 12b) and is covered with the two boss portions (11b, 21b) from both sides in the air flow direction. Counter-rotating blower for vehicles. The rotational drive shaft (21) is disposed between the two axial fans (11, 12),
A driving side gear (22) is connected to the rotation drive shaft (21),
The rotary shafts (11a, 12a) of the two axial fans (11, 12) are arranged perpendicular to the rotary drive shaft (21), respectively, on one end side of the rotary shafts (11a, 12a). Are respectively connected to the driven gears (11f, 12f) that mesh with the driven gear (22).
The vehicle according to claim 1, wherein the driven gears (11f, 12f) of the two axial fans (11, 12) are rotated in opposite directions by the main driving gear (22). For counter-rotating blower. 2. The vehicle two according to claim 2, wherein a gap (A) between an end portion of the boss portion (11 b, 12 b) and the rotation drive shaft (21) is in a range of greater than 0 and equal to or less than 10 mm. Heavy reversing blower. The vehicle duplex according to claim 2, wherein a gap (A) between an end of the boss (11b, 12b) and the rotary drive shaft (21) is in a range of 3 mm to 6 mm. Inverting blower. The gap (B) between the boss portion (11b, 12b) and the gear box (5) is in the range of more than 0 and 10 mm or less, according to any one of claims 1 to 4. Counter-rotating blower for vehicles. The vehicle according to any one of claims 1 to 4, wherein a gap (B) between the boss portion (11b, 12b) and the gear box (5) is in a range of 3 mm to 6 mm. For counter-rotating blower. Between the said boss | hub part (11b, 12b) and the said gear box (5), the cyclic | annular protrusion which protrudes toward the other from one side among the said boss | hub part (11b, 12b) and the said gear box (5). The vehicular counter-rotating blower according to any one of claims 1 to 6, wherein a maze structure is formed by providing at least one section (110, 120, 510). The boss portion (11b, 12b) is provided with an annular first maze wall (110, 120) protruding toward the gear box (5),
In the gear box (5), an annular second maze wall (510) protruding toward the boss part (11b, 12b) is concentrically different in diameter from the first maze wall (110, 120). It is provided in
The counter-rotating vehicular type according to claim 7, wherein the maze structure is composed of the first maze wall (110, 120) and the second maze wall (510). Blower.

Images