An engine fan that changes with altitude

Abstract

The present invention belongs to the technical field of engine fans, and specifically relates to an engine fan that changes with altitude, comprising: a front cover, fan blades, a first bushing, a fan blade shaft, a spring washer, a fixing nut, a baffle, a piston, a second bushing, an air bag, a piston pin, a fan hub, a connecting rod, a bearing and a crankshaft, wherein the left end of the fan hub is connected to the front cover, the fan blades are connected to the fan blade shaft, a first bushing is arranged outside the fan blade shaft, and the fan blades are mounted on the crankshaft through the fan blade shaft. By installing an air bag inside the engine fan in a plateau environment, changes in external environmental pressure can be effectively sensed. When the external environmental pressure decreases, the expansion of the air bag pushes the piston to move, driving the connecting rod crankshaft to rotate, and then rotating the fan blade angle, thereby achieving the purpose of increasing the intake volume, thereby improving the problem of insufficient intake volume and insufficient engine cooling due to increased altitude and reduced density under the same conditions.

Description

Technical Field

[0001] The invention relates to the technical field of engine fans, and in particular to an engine fan that changes with altitude. Background Art

[0002] Under high altitude environmental conditions, the combustion in the engine cylinder deteriorates and the cooling system's heat transfer capacity decreases. If not controlled and handled, it will seriously affect the heat transfer between high-temperature components and the coolant, leading to problems such as engine power reduction, excessive water and oil temperature increase, excessive heat load, and reduced reliability, which ultimately seriously affects the performance of the vehicle. On the one hand, it is because the atmospheric pressure drops and the air density decreases, resulting in a decrease in the engine's air intake, severe afterburning, and an increase in the temperature of heated components such as the cylinder head and cylinder liner; on the other hand, it is because the radiator's heat dissipation capacity decreases under high altitude conditions.

[0003] At the same time, the fan lift will also decrease with the increase of altitude. For every 1000m increase in altitude, the fan lift will decrease by an average of 7.38%. This is because the air density decreases and the air flow resistance decreases as the altitude increases. Moreover, the lower the engine speed, the more obvious the impact of the plateau environment on power. This is because the compensation effect of the supercharger is weakened at low speeds and the pressure ratio is reduced. For traditional cooling fans, when in a plateau environment, they can only rely on the engine crankshaft to drive its rotation to cool the engine. It cannot solve the problem of reduced actual air intake and weakened cooling effect of the engine cooling fan due to changes in external environmental pressure. Therefore, by changing the angle of the fan blades and increasing the air intake, it can solve the problems of insufficient engine cooling, power reduction, and excessive heat load caused by the plateau environment to a certain extent. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or problems existing in the existing engine fans, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide an engine fan that changes with the altitude. By installing an air bag inside the engine fan in a plateau environment, the change of the external environmental pressure can be effectively sensed. When the external environmental pressure decreases, the expansion of the air bag pushes the piston to move, driving the connecting rod crankshaft to rotate, and then rotating the fan blade angle, thereby achieving the purpose of increasing the intake volume. Under the same circumstances, the problem of insufficient intake volume and insufficient engine cooling due to increased altitude and reduced density is improved.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] An engine fan that changes with altitude, comprising: a front cover, a fan blade, a first bushing, a fan blade shaft, a spring washer, a fixing nut, a baffle, a piston, a second bushing, an airbag, a pin shaft, a fan hub, a connecting rod, a bearing and a crankshaft, wherein the left end of the fan hub is connected to the front cover, the fan blade is connected to the fan blade shaft, a first bushing is arranged outside the fan shaft, the fan blade is installed on the crankshaft through the fan blade shaft, the end of the fan blade shaft is locked by a fixing nut, a spring washer is arranged between the fixing nut and the crankshaft, an airbag is arranged in the inner cavity of the fan hub, the left side of the airbag is connected to the piston, the pin shaft is installed in the piston, a second bushing is arranged outside the pin shaft, the piston is connected to the connecting rod through the pin shaft, baffles are arranged at both ends of the pin shaft, and the connecting rod and the crankshaft are connected through the bearing;

[0009] The connecting rod and the crankshaft are arranged to be inclined relative to each other, so as to avoid the connecting rod and the crankshaft being in a straight line;

[0010] The airbag is filled with gas at standard atmospheric pressure;

[0011] When the external environmental pressure of the engine changes, the airbag filled with standard atmospheric pressure gas will change. When the external environmental pressure decreases, that is, when the altitude increases, the air pressure inside the airbag is higher than the external air pressure, and it will expand, pushing the piston to move laterally. The piston is connected to the connecting rod through a pin shaft. The connecting rod rotates under the push of the piston, and the connecting rod pushes the crankshaft to rotate. The rotation of the crankshaft will drive the fan shaft to rotate, and then the fan blade angle will rotate. As the angle increases, the fan air intake will increase accordingly. When the external environmental pressure of the engine increases, the pressure difference between the pressure of the gas in the airbag and the external environment will gradually decrease, and the angle of rotation of the fan blades will also decrease.

[0012] As a preferred solution of the engine fan that changes with the altitude described in the present invention, the fan blades and the fan blade shaft are an integrated structure, and the end of the fan blade shaft is provided with a thread that cooperates with a fixing nut.

[0013] As a preferred solution of the engine fan that changes with the altitude described in the present invention, a mounting hole and a mounting slot are provided at the right end of the fan hub.

[0014] Compared with the prior art: the present invention installs an air bag inside the engine fan in a plateau environment, which can effectively sense the changes in the external environmental pressure. When the external environmental pressure decreases, the expansion of the air bag pushes the piston to move, driving the connecting rod crankshaft to rotate, and then rotating the fan blade angle, thereby achieving the purpose of increasing the intake volume. Under the same conditions, the problem of insufficient intake volume and insufficient engine cooling caused by increased altitude and reduced density is improved. The structure is relatively simple and the reliability is good. By using the air bag, the engine cooling intensity can be adjusted according to the changes in the external atmospheric pressure, effectively improving the engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] In the figure: front cover 1, fan blades 2, first bushing 3, fan blade shaft 4, spring washer 5, fixing nut 6, baffle 7, piston 8, second bushing 9, airbag 10, pin 11, fan hub 12, connecting rod 13, bearing 14, crankshaft 15. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The present invention provides an engine fan that changes with the altitude. An air bag is installed inside the engine fan in a plateau environment, which can effectively sense the change of the external environmental pressure. When the external environmental pressure decreases, the expansion of the air bag pushes the piston to move, drives the connecting rod crankshaft to rotate, and then rotates the fan blade angle to achieve the purpose of increasing the intake volume. Therefore, under the same condition, the problem of insufficient intake volume and insufficient engine cooling caused by increased altitude and reduced density is improved. Please refer to Figure 1 , including: a front cover 1, a fan blade 2, a first bushing 3, a fan blade shaft 4, a spring washer 5, a fixing nut 6, a baffle 7, a piston 8, a second bushing 9, an air bag 10, a pin 11, a fan hub 12, a connecting rod 13, a bearing 14 and a crankshaft 15;

[0023] Please refer again Figure 1 The left end of the fan hub 12 is connected to the front cover 1, the fan blade 2 is connected to the fan blade shaft 4, the first bushing 3 is arranged outside the fan blade shaft 4, the fan blade 2 is installed on the crankshaft 15 through the fan blade shaft 4, the end of the fan blade shaft 4 is locked by the fixing nut 6, and a spring washer 5 is arranged between the fixing nut 6 and the crankshaft 15. An air bag 10 is arranged in the inner cavity of the fan hub 12, and the left side of the air bag 10 is connected to the piston 8. The pin 11 is installed in the piston 8, and a second bushing 9 is arranged outside the pin 11. The piston 8 is connected to the connecting rod 13 through the pin 11, and baffles 7 are installed at both ends of the pin 11. The connecting rod 13 and the crankshaft 15 are connected through a bearing 14.

[0024] Among them, when the external environmental pressure of the engine changes, the airbag 10 filled with standard atmospheric pressure gas will change. When the external environmental pressure decreases, that is, when the altitude increases, the internal air pressure of the airbag 10 is higher than the external air pressure, and it will expand, pushing the piston 8 to move laterally. The piston 8 is connected to the connecting rod 13 through the pin 11. The pin 11 is installed in the piston 8. Baffles 7 are installed at both ends of the pin 11 to prevent the pin 11 from sliding along its axial direction. The connecting rod 13 rotates under the push of the piston 8. In order to prevent the connecting rod 13 from rotating in two directions, the connecting rod 13 should be installed at a certain angle with the crankshaft 15 to prevent the two from rotating in two directions. On a straight line, a bearing 14 is installed between the connecting rod 13 and the crankshaft 15. The connecting rod 13 pushes the crankshaft 15 to rotate together. The crankshaft 15 is connected to a fan blade shaft 4 with a thread on one end. The bottom end of the blade shaft 4 is locked with a fixing nut 6 to prevent the fan shaft 4 from sliding. At this time, the rotation of the crankshaft 15 will also drive the blade shaft 4 to rotate. Generally, the blade shaft 4 and the blade 2 are processed into one piece, and then the angle of the blade 2 will rotate under the action of a series of objects such as the piston 8. As the angle increases, the fan intake volume will increase accordingly, which can well improve the low cooling intensity caused by insufficient engine air intake in plateau environments.

[0025] When the pressure of the engine's external environment increases, the pressure difference between the pressure of the gas in the airbag 10 and the external environment will gradually decrease, and the rotation angle of the fan blade 2 will also decrease. This is because the gas density will increase and the air intake will also increase. The reduction in the angle of the fan blade 2 is also to prevent excessive air intake from causing over-cooling of the engine. When the pressure difference is not enough to drive the piston 8 to move, that is, it is not enough to overcome the fan's intake resistance, the piston connecting rod 13 stops working under the action of the fan's intake resistance and returns to its initial position. When the pressure difference increases, that is, the altitude increases, the airbag 10 will work again, which can well match the changes in the external altitude, thereby properly cooling the engine and keeping the engine's performance from being affected by the excessively high external environment.

[0026] The invention is used on vehicle engines in plateau environments or areas with relatively high altitudes, and can maximize the role of the invention.

[0027] The fan blades 2 and the fan blade shaft 4 are an integrated structure, and a thread that cooperates with the fixing nut 6 is provided at the end of the fan blade shaft 4 to improve the connection stability between the fan blades 2, the fan blade shaft 4 and the crankshaft 15.

[0028] The connecting rod 13 and the crankshaft 15 are arranged to be inclined relative to each other, so as to prevent the connecting rod 13 and the crankshaft 15 from being in a straight line and to prevent the connecting rod 13 from rotating in two directions.

[0029] The right end of the fan hub 12 is provided with a mounting hole and a mounting slot for connecting the fan hub 12 to the engine.

[0030] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An engine fan that changes with altitude, characterized in that: include: A front cover (1), a fan blade (2), a first bushing (3), a fan blade shaft (4), a spring washer (5), a fixing nut (6), a baffle (7), a piston (8), a second bushing (9), an air bag (10), a pin shaft (11), a fan hub (12), a connecting rod (13), a bearing (14) and a crankshaft (15), wherein the left end of the fan hub (12) is connected to the front cover (1), the fan blade (2) is connected to the fan blade shaft (4), a first bushing (3) is arranged outside the fan blade shaft (4), the fan blade (2) is mounted on the crankshaft (15) through the fan blade shaft (4), and the fan blade shaft (4) The end is locked by a fixing nut (6), a spring washer (5) is arranged between the fixing nut (6) and the crankshaft (15), an air bag (10) is arranged in the inner cavity of the fan hub (12), the left side of the air bag (10) is connected to the piston (8), the pin shaft (11) is installed in the piston (8), a second bushing (9) is arranged outside the pin shaft (11), the piston (8) is connected to the connecting rod (13) through the pin shaft (11), baffles (7) are arranged at both ends of the pin shaft (11), and the connecting rod (13) and the crankshaft (15) are connected through a bearing (14); The connecting rod (13) and the crankshaft (15) are arranged to be inclined relative to each other, so as to avoid the connecting rod (13) and the crankshaft (15) being in a straight line; The airbag (10) is filled with gas at standard atmospheric pressure; When the pressure of the external environment of the engine changes, the airbag (10) filled with standard atmospheric pressure gas will change. When the pressure of the external environment decreases, that is, when the altitude increases, the internal air pressure of the airbag (10) is higher than the external air pressure, and the airbag (10) will expand, pushing the piston (8) to move horizontally. The piston (8) is connected to the connecting rod (13) through the pin (11). The connecting rod (13) rotates under the push of the piston (8). The connecting rod (13) pushes the crankshaft (15) to rotate together. The rotation of the crankshaft (15) will drive the fan shaft (4) to rotate, and then the angle of the fan blade (2) will rotate. As the angle increases, the fan intake volume will increase accordingly. When the pressure of the external environment of the engine increases, the pressure difference between the pressure of the gas in the airbag (10) and the external environment will gradually decrease, and the rotation angle of the fan blade (2) will also decrease.

2. The engine fan that changes with altitude according to claim 1, characterized in that: The fan blade (2) and the fan blade shaft (4) are an integrated structure, and a thread that cooperates with a fixing nut (6) is provided at the end of the fan blade shaft (4).

3. The engine fan that changes with altitude according to claim 1, characterized in that: The right end of the fan hub (12) is provided with a mounting hole and a mounting slot.

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