Double-fan device of internal combustion engine

Abstract

The invention discloses a double-fan device of an internal combustion engine, which relates to the internal combustion engine and comprises a first transmission mechanism, a second transmission mechanism, a transmission shaft, a front fan and a rear fan, the first transmission mechanism is installed on a gear chamber of the internal combustion engine, the transmission shaft is rotationally installed on the gear chamber, the first transmission mechanism is in transmission connection with the crankshaft and the transmission shaft at the same time, and the front fan is installed at the end, away from the first transmission mechanism, of the transmission shaft. And a driving device body is rotationally mounted on the transmission shaft and is in transmission connection with the crankshaft through a second transmission mechanism. The two fans are coaxially arranged in series, larger air volume can be provided, meanwhile, the linear speed of the fans is reduced, noise is lowered, and the structural reliability of the fans is improved; and the two fans are redundant backups for each other, so that the operation reliability of the whole internal combustion engine power device is improved.

Description

Technical Field

[0001] The present invention relates to an internal combustion engine, and more particularly to a dual-fan device of an internal combustion engine. Background Art

[0002] Water-cooled internal combustion engines usually need to use a water tank to cool the cooling water of the internal combustion engine, or use an intercooler to cool the high-temperature intake air after supercharging. The heat exchange of the water tank and the intercooler usually uses an axial flow fan. Axial flow fans are either belt-driven or motor-driven. For belt-driven fans, they are usually driven by the crankshaft pulley on the internal combustion engine body, and only one fan can be arranged. For motor-driven fans, multiple motors can be arranged and evenly distributed on the windward side of the water tank.

[0003] Affected by the installation size, the windward area of ​​the water tank (the product of the length and width of the water tank cooling core) cannot be designed to be infinite. When the area size is certain, the diameter of the fan is also limited. In addition, due to the influence of the fan's own mechanical strength, vibration, noise, and the mechanical load capacity of the transmission device, the fan speed must also be limited. Therefore, for a certain windward area and speed limit, it is difficult to increase the air volume of the axial flow fan. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a dual-fan device for an internal combustion engine in view of the deficiencies in the prior art, which adopts two coaxial fans arranged in series and can provide a larger air volume under the premise of a certain windward area of ​​the water tank.

[0005] A dual-fan device for an internal combustion engine described in the present invention comprises a first transmission mechanism, a second transmission mechanism, a transmission shaft, a front fan and a rear fan; the first transmission mechanism is mounted on the gear chamber of the internal combustion engine, the transmission shaft is rotatably mounted on the gear chamber, the first transmission mechanism is simultaneously transmission-connected to the crankshaft and the transmission shaft, the front fan is mounted on an end of the transmission shaft away from the first transmission mechanism; a drive device body is rotatably mounted on the transmission shaft, and the drive device body is transmission-connected to the crankshaft via the second transmission mechanism.

[0006] Preferably, the rotation direction of the front fan is opposite to that of the rear fan.

[0007] Preferably, the first transmission mechanism includes a crankshaft drive gear, a first idle gear, a second idle gear and a fan drive gear; the crankshaft drive gear is fixed on the crankshaft, the first idle gear and the second idle gear are both rotatably installed in the gear chamber, the fan drive gear is fixed on the transmission shaft, and the crankshaft drive gear, the first idle gear, the second idle gear and the fan drive gear are meshed and connected in sequence.

[0008] Preferably, the second transmission mechanism includes a fan pulley, a belt, a third idle gear and a crankshaft pulley; the fan pulley is fixed on the driving device body, the crankshaft pulley is fixedly installed on the end of the crankshaft, the third idle gear is rotatably arranged on one side of the gear chamber, and the fan pulley is transmission-connected to the crankshaft pulley through the belt and the third idle gear.

[0009] Preferably, the fan pulley and the driving device body are an integrated structure.

[0010] Preferably, the ratio of the diameters of the crankshaft pulley and the fan pulley is equal to the ratio of the number of teeth of the crankshaft drive gear and the fan drive gear.

[0011] Preferably, the driving device body is rotatably connected to the transmission shaft via a first bearing and a second bearing installed at both ends thereof, and a front end oil seal and a rear end oil seal are respectively installed on opposite sides of the first bearing and the second bearing.

[0012] Preferably, a shaft sleeve is provided in the gear chamber, one end of the shaft sleeve is fixedly provided with a shaft sleeve mounting flange which is an integral structure therewith, the shaft sleeve mounting flange is fixed in the gear chamber by bolts, and a first sliding bearing and a second sliding bearing are respectively provided at both ends of the shaft sleeve, and the transmission shaft is rotatably connected to the shaft sleeve via the first sliding bearing and the second sliding bearing.

[0013] Preferably, a sleeve oil inlet is provided in the sleeve, and the sleeve oil inlet corresponds to the position of the first sliding bearing. A longitudinal oil inlet channel is provided at one end of the transmission shaft, an axial oil inlet channel is provided in the transmission shaft, and a longitudinal oil outlet channel is provided at the other end of the transmission shaft, and the longitudinal oil outlet channel corresponds to the position of the second sliding bearing. An oil return chamber is provided between the transmission shaft and the sleeve, and an oil return port is provided in the sleeve. The sleeve oil inlet, the longitudinal oil inlet channel, the axial oil inlet channel, the longitudinal oil outlet channel, the oil return chamber and the oil return port are connected in sequence to form a sliding bearing lubrication structure, and the oil return port is connected to the inner cavity of the gear chamber.

[0014] Preferably, an auxiliary support shaft seat is installed at one end of the shaft sleeve away from the gear chamber, and a bracket is fixedly installed on the auxiliary support shaft seat.

[0015] Beneficial Effects

[0016] The advantages of the present invention are: two fans are installed on a transmission shaft, and the fans are driven by different transmission mechanisms respectively, that is, the two fans are arranged in a coaxial series, and a larger air volume can be provided under the premise of a certain windward area of ​​the water tank. Moreover, thanks to the increase in air volume, the fan diameter can be reduced under the premise of unchanged heat dissipation power, the fan linear speed can be reduced, the noise can be reduced, and the reliability of the fan structure can be improved; at the same time, under the premise of meeting the cooling requirements, a smaller water tank can also be used, so that the cooling mechanism structure of the internal combustion engine is more compact, the configuration is more flexible, and the system reliability and adaptability can be improved. In addition, the two fans are redundant backups for each other. When one fan fails, the other fan can still continue to work and provide a certain amount of air, so that the internal combustion engine will not stop working due to the lack of fan blowing and heat dissipation, thereby improving the operating reliability of the entire internal combustion engine power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side schematic diagram of the layout structure of the dual fan device and the water tank of the present invention;

[0018] Figure 2 It is a front view schematic diagram of the dual fan device of the present invention;

[0019] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at KK in the middle;

[0020] Figure 4 Based on Figure 3 An enlarged structural schematic diagram of a cross-section of a driving device body (the fan portion is not shown in the figure);

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the first transmission mechanism of the present invention;

[0022] Figure 6 It is a front structural schematic diagram of the second transmission mechanism of the present invention;

[0023] Figure 7 It is a schematic diagram of the side structure of the dual-fan device of the present invention (the fan part thereof is not shown in the figure);

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the dual-fan device of the present invention (the fan part is not shown in the figure).

[0025] Among them: 1-gear chamber; 2-sleeve mounting flange; 3-sleeve; 4-drive device body; 5-fan pulley; 6-belt; 7-rear fan; 8-front fan; 9-return oil chamber; 10-auxiliary support shaft seat; 11-front fan connection plate; 12-drive shaft; 13-front fan mounting flange; 14-drive device bearing sleeve; 15-rear fan connection plate; 16-third idle gear; 17-crankshaft pulley; 18-crankshaft; 19-crankshaft Driving gear; 20-first idle gear; 21-fan driving gear; 22-drive shaft mounting flange; 23-second idle gear; 24-bracket; 25-first sliding bearing; 26-longitudinal oil inlet channel; 27-sleeve oil inlet port; 28-axial oil inlet channel; 29-second bearing; 30-first bearing; 31-second sliding bearing; 32-longitudinal oil outlet channel; 33-front end oil seal; 34-rear end oil seal; 35-oil return port; 36-gear chamber inner cavity. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0027] See also Figure 1-Figure 8 The present invention discloses a dual-fan device for an internal combustion engine, comprising a first transmission mechanism, a second transmission mechanism, a transmission shaft 12, a front fan 8 and a rear fan 7. The first transmission mechanism is mounted on the gear chamber 1 of the internal combustion engine, the transmission shaft 12 is rotatably mounted on the gear chamber 1, the first transmission mechanism is simultaneously connected to the crankshaft 18 and the transmission shaft 12, and the front fan 8 is mounted on the end of the transmission shaft 12 away from the first transmission mechanism; a driving device body 4 is rotatably mounted on the transmission shaft 12, and the driving device body 4 is connected to the crankshaft 18 through the second transmission mechanism. The two fans are arranged in a coaxial serial manner, and a larger air volume can be provided under the premise that the windward area of ​​the water tank is certain. Moreover, thanks to the increase in air volume, the fan diameter can be reduced, the fan linear speed can be reduced, the noise can be reduced, and the fan structure reliability can be improved under the premise that the heat dissipation power remains unchanged; at the same time, under the premise of meeting the cooling requirements, a smaller water tank can also be used, so that the cooling mechanism structure of the internal combustion engine is more compact, the configuration is more flexible, and the system reliability and adaptability are improved. In addition, the two fans serve as redundant backups for each other. When one fan fails, the other fan can continue to work and provide a certain amount of air volume, so that the internal combustion engine will not stop working due to the lack of fan blowing air and dissipating heat, thereby improving the operating reliability of the entire internal combustion engine power unit.

[0028] In this embodiment, the rotation direction of the front fan 8 is opposite to that of the rear fan 7. That is, the two fans rotate in different directions. At the same time, the blades of the two fans must ensure that the axial airflows of the two fans remain consistent, and the blades of the fans must be set and installed to ensure that the axial airflows have the same direction.

[0029] like Figure 5 As shown, in this embodiment, the first transmission mechanism includes a crankshaft drive gear 19, a first idle gear 20, a second idle gear 23 and a fan drive gear 21. The crankshaft drive gear 19 is fixed on the crankshaft 18, the first idle gear 20 and the second idle gear 23 are both rotatably mounted in the gear chamber 1, and the transmission shaft 12 is fixed to the fan drive gear 21 through the transmission shaft mounting flange 22. The crankshaft drive gear 19, the first idle gear 20, the second idle gear 23 and the fan drive gear 21 are meshed and connected in sequence, and a front fan connection plate 11 is fixed on one side of the fan drive gear 21, and a front fan mounting flange 13 is fixed on one side of the front fan connection plate 11 for mounting the front fan 8. The crankshaft drive gear 19 drives the first idle gear 20, the second idle gear 23 and the fan drive gear 21 in sequence, thereby realizing the rotation of the front fan.

[0030] In addition, for the second transmission mechanism, Figure 6-Figure 8 As shown, it includes a fan pulley 5, a belt 6, a third idler gear and a crank pulley 17. The fan pulley 5 is fixed on the driving device body 4, and a rear fan connecting disc 15 is fixed on one side of the driving device body 4. A rear fan mounting flange is fixed on one side of the rear fan connecting disc 15 for mounting the rear fan 7. The crank pulley 17 is fixedly mounted at the end of the crankshaft 18, and the third idler gear 16 is rotatably arranged on one side of the gear chamber 1. The fan pulley 5 is connected to the crank pulley 17 through the belt 6 and the third idler gear 16, thereby driving the rear fan 7. Among them, the fan pulley 5 and the driving device body 4 are an integrated structure, making their connection more reliable. For the second transmission mechanism, it is not limited to being driven by the crankshaft 18 to drive the belt transmission mechanism, but can also be driven by an external motor or other power source with a pulley through a belt.

[0031] In this embodiment, the diameter of the crankshaft pulley 17 is D1, the diameter of the fan pulley 5 is D2, the number of teeth of the crankshaft drive gear 19 is Z1, and the number of teeth of the fan drive gear 21 is Z2. Preferably, the speed ratio D1:D2=Z1:Z2 is set, that is, the speed of the rear fan 7 and the front fan 8 are the same, so as to obtain high efficiency and large air volume, but the speed ratios of D1:D2 and Z1:Z2 can also be adjusted as needed.

[0032] Regarding the installation structure of the drive device body 4, the drive device bearing sleeves 14 are fixedly provided at both ends of the drive device body 4 of this embodiment, and the first bearing 30 and the second bearing 29 are respectively installed in the two drive device bearing sleeves 14. The first bearing 30 and the second bearing 29 installed at both ends of the drive device body 4 are rotatably connected with the transmission shaft 12, and the front end oil seal 33 and the rear end oil seal 34 are respectively installed on the opposite sides of the first bearing 30 and the second bearing 29. The use of two sets of bearings to support and rotate the drive device body 4 can greatly improve its stability.

[0033] like Figure 3 and Figure 4 As shown, for the rotational installation of the transmission shaft 12, a shaft sleeve 3 is provided in the gear chamber 1 of this embodiment, and a shaft sleeve mounting flange 2 which is an integral structure with the shaft sleeve 3 is fixedly provided at one end of the shaft sleeve 3, and the shaft sleeve mounting flange 2 is fixed in the gear chamber 1 by bolts, and a first sliding bearing 25 and a second sliding bearing 31 are provided at both ends of the shaft sleeve 3, respectively, and the transmission shaft 12 is rotationally connected to the shaft sleeve 3 through the first sliding bearing 25 and the second sliding bearing 31. Similarly, the transmission shaft 12 also adopts two sets of bearings to realize its support and rotation, which greatly improves its stability.

[0034] Since two fans are directly / indirectly installed on the transmission shaft 12, the length of the transmission shaft 12 is longer than the driving device body 4. Such a structure will cause the two sliding bearings to bear a greater force. In order to avoid excessive wear, the present embodiment designs a sliding bearing lubrication structure to solve the above problem.

[0035] Specifically, a sleeve oil inlet 27 is provided in the sleeve 3, and the sleeve oil inlet 27 corresponds to the position of the first sliding bearing 25. A longitudinal oil inlet channel 26 is provided at one end of the transmission shaft 12, and an axial oil inlet channel 28 is provided in the transmission shaft 12. A longitudinal oil outlet channel 32 is provided at the other end of the transmission shaft 12, and the longitudinal oil outlet channel 32 corresponds to the position of the second sliding bearing 31. An oil return chamber 9 is provided between the transmission shaft 12 and the sleeve 3, and an oil return port 35 is provided in the sleeve 3. The sleeve oil inlet 27, the longitudinal oil inlet channel 26, the axial oil inlet channel 28, the longitudinal oil outlet channel 32, the oil return chamber 9 and the oil return port 35 are connected in sequence to form a sliding bearing lubrication structure, and the oil return port 35 is connected to the gear chamber inner cavity 36. The lubricating oil enters the sliding bearing lubrication structure through the sleeve oil inlet 27, and finally flows into the gear chamber inner cavity 36 through the longitudinal oil inlet channel 26, the axial oil inlet channel 28, the longitudinal oil outlet channel 32, the oil return chamber 9 and the oil return port 35 in sequence. During this process, when the lubricating oil flows through the connection between the sleeve oil inlet 27 and the longitudinal oil inlet channel 26, part of the lubricating oil flows into the first sliding bearing 25 to lubricate it; when the lubricating oil flows through the longitudinal oil outlet channel 32, the lubricating oil will pass through the second sliding bearing 31 and then enter the oil return chamber 9, thereby achieving lubrication of the second sliding bearing 31.

[0036] Preferably, an auxiliary support shaft seat 10 is installed at one end of the sleeve 3 away from the gear chamber 1, and a bracket 24 is fixedly installed on the auxiliary support shaft seat 10, which provides further support for the transmission shaft 12, and the bracket 24 is arranged and installed according to the on-site space conditions.

[0037] The working principle of the present invention is: when the internal combustion engine is started, the rotation of the crankshaft 18 will simultaneously drive the crankshaft drive gear 19 and the crankshaft pulley 17 to rotate, and the rotation of the crankshaft drive gear 19 will drive the first idler gear 20, the second idler gear 23 and the fan drive gear 21 to rotate, thereby driving the transmission shaft 12 to rotate, and finally realize the driving of the front fan 8; the rotation of the crankshaft pulley 17 will drive the fan pulley 5 and the drive device body 4 to rotate through the belt 6, and finally realize the rotation of the rear fan 7, and the rotation directions of the two fans are opposite. In addition, when the internal combustion engine is started, the lubricating oil will enter the sliding bearing lubrication structure through the sleeve oil inlet 27, and the lubricating oil will successively pass through the longitudinal oil inlet channel 26, the axial oil inlet channel 28, the longitudinal oil outlet channel 32, the return oil chamber 9 and the return oil port 35 and finally flow into the gear chamber inner cavity 36, and in this process, the lubrication of the two sliding bearings is realized.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A dual fan device for an internal combustion engine, characterized in that: The invention comprises a first transmission mechanism, a second transmission mechanism, a transmission shaft (12), a front fan (8) and a rear fan (7); the first transmission mechanism is mounted on a gear chamber (1) of an internal combustion engine, the transmission shaft (12) is rotatably mounted on the gear chamber (1), the first transmission mechanism is simultaneously transmission-connected to a crankshaft (18) and the transmission shaft (12), the front fan (8) is mounted on an end of the transmission shaft (12) away from the first transmission mechanism; a drive device body (4) is rotatably mounted on the transmission shaft (12), and the drive device body (4) is transmission-connected to the crankshaft (18) via the second transmission mechanism.

2. A dual fan device for an internal combustion engine according to claim 1, characterized in that: The rotation direction of the front fan (8) is opposite to that of the rear fan (7).

3. A dual fan device for an internal combustion engine according to claim 2, characterized in that: The first transmission mechanism comprises a crankshaft drive gear (19), a first idle gear (20), a second idle gear (23) and a fan drive gear (21); the crankshaft drive gear (19) is fixed on the crankshaft (18), the first idle gear (20) and the second idle gear (23) are both rotatably mounted in the gear chamber (1), the fan drive gear (21) is fixed on the transmission shaft (12), and the crankshaft drive gear (19), the first idle gear (20), the second idle gear (23) and the fan drive gear (21) are meshed and connected in sequence.

4. A dual fan device for an internal combustion engine according to claim 3, characterized in that: The second transmission mechanism comprises a fan pulley (5), a belt (6), a third idler gear (16) and a crankshaft pulley (17); the fan pulley (5) is fixed on the driving device body (4), the crankshaft pulley (17) is fixedly mounted on the end of the crankshaft (18), the third idler gear (16) is rotatably arranged on one side of the gear chamber (1), and the fan pulley (5) is connected to the crankshaft pulley (17) through the belt (6) and the third idler gear (16).

5. A dual fan device for an internal combustion engine according to claim 4, characterized in that: The fan pulley (5) and the driving device body (4) are an integrated structure.

6. A dual fan device for an internal combustion engine according to claim 4, characterized in that: The diameter ratio of the crankshaft pulley (17) and the fan pulley (5) is equal to the tooth number ratio of the crankshaft drive gear (19) and the fan drive gear (21).

7. A dual fan device for an internal combustion engine according to claim 1 or 4, characterized in that: The driving device body (4) is rotatably connected to the transmission shaft (12) via a first bearing (30) and a second bearing (29) mounted at both ends thereof, and a front end oil seal (33) and a rear end oil seal (34) are mounted on opposite sides of the first bearing (30) and the second bearing (29), respectively.

8. A dual-fan device for an internal combustion engine according to claim 1, characterized in that: A shaft sleeve (3) is provided in the gear chamber (1); a shaft sleeve mounting flange (2) which is an integral structure with the shaft sleeve (3) is fixedly provided at one end of the shaft sleeve (3); the shaft sleeve mounting flange (2) is fixed in the gear chamber (1) by means of bolts; a first sliding bearing (25) and a second sliding bearing (31) are respectively provided at both ends of the shaft sleeve (3); and the transmission shaft (12) is rotatably connected to the shaft sleeve (3) via the first sliding bearing (25) and the second sliding bearing (31).

9. A dual-fan device for an internal combustion engine according to claim 8, characterized in that: The shaft sleeve (3) is provided with a shaft sleeve oil inlet (27), and the shaft sleeve oil inlet (27) corresponds to the position of the first sliding bearing (25); one end of the transmission shaft (12) is provided with a longitudinal oil inlet channel (26), the transmission shaft (12) is provided with an axial oil inlet channel (28), the other end of the transmission shaft (12) is provided with a longitudinal oil outlet channel (32), and the longitudinal oil outlet channel (32) corresponds to the position of the second sliding bearing (31); an oil return chamber (9) is provided between the transmission shaft (12) and the shaft sleeve (3), and an oil return port (35) is provided in the shaft sleeve (3); the shaft sleeve oil inlet (27), the longitudinal oil inlet channel (26), the axial oil inlet channel (28), the longitudinal oil outlet channel (32), the oil return chamber (9) and the oil return port (35) are sequentially connected to form a sliding bearing lubrication structure, and the oil return port (35) is connected to the inner chamber (36) of the gear chamber.

10. A dual fan device for an internal combustion engine according to claim 8 or 9, characterized in that: An auxiliary support shaft seat (10) is installed at one end of the shaft sleeve (3) away from the gear chamber (1), and a bracket (24) is fixedly installed on the auxiliary support shaft seat (10).

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