CN112081885A

CN112081885A - Fan speed regulating device

Info

Publication number: CN112081885A
Application number: CN202010910214.8A
Authority: CN
Inventors: 张健; 史振盛; 许自顺; 申宏霞; 刘赞森; 徐红光; 张赛
Original assignee: FAW Jiefang Automotive Co Ltd; FAW Jiefang Qingdao Automobile Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd; FAW Jiefang Qingdao Automobile Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-12-15
Anticipated expiration: 2040-09-02
Also published as: CN112081885B

Abstract

The invention belongs to the technical field of engine power driven fans, and discloses a fan speed regulating device which comprises an output shaft, a one-way bearing, an input shaft, a clutch, an inner gear ring and a planetary gear mechanism, wherein the one-way bearing is sleeved on the outer side of the output shaft, the input shaft is sleeved on the outer side of the one-way bearing, the input shaft can drive the output shaft to rotate along one direction through the one-way bearing, the clutch comprises a fixed wheel and a driving wheel, the inner gear ring is connected with the input shaft, the planetary gear mechanism is arranged in the inner gear ring and comprises a sun wheel and a plurality of planetary gear sets uniformly distributed around the sun wheel, the sun wheel is fixedly connected to the output shaft, the driving wheel is used as a planet carrier, one planetary gear set comprises two planet wheels which are mutually meshed and are respectively and rotatably connected to the driving wheel. Compared with a speed raising mechanism with a belt pulley and a belt matched with each other, the belt type speed raising mechanism is simpler in structure and lighter in weight.

Description

Fan speed regulating device

Technical Field

The invention relates to the technical field of power-driven fans of engines, in particular to a fan speed regulating device.

Background

With the upgrading of emission standards and the continuous improvement of engine power, on one hand, new accessory systems such as Exhaust Gas Recirculation (EGR) bring more heat dissipation capacity, and on the other hand, the arrangement space of the cooling system of the whole vehicle is more and more compact, so that the heat dissipation capacity of the cooling system needs to be further improved in the more compact space.

The increase in the heat dissipation capacity of a cooling system is generally considered from both the "water" and "air" aspects. The 'water' refers to cooling liquid, a carrier is a radiator, the heat dissipation capacity is improved by improving the heat dissipation area of the radiator generally, but the mode is greatly limited by the arrangement space of the whole vehicle, and the realization difficulty is high. The "air" refers to cooling air, the larger the cooling air flow rate, the higher the heat exchange efficiency, and the heat dissipation capacity is usually increased by increasing the rated flow rate of the fan.

There are two ways to increase the rated flow of the fan: one is to increase the diameter of the fan, and the mode is also greatly limited by the arrangement space of the whole vehicle and is not easy to realize; the other is to increase the fan speed.

Conventional engine power driven fans are generally classified into a crankshaft direct-coupled fan and an up-speed fan. At present, a crankshaft direct-connected fan mostly depends on a fan clutch to control the rotating speed of the fan, and the highest rotating speed of the fan is not greater than the rotating speed of a crankshaft of an engine; the speed raising fan has the forms of a high-level fan, a crankshaft speed raising fan and the like, is mainly composed of a belt and a belt pulley mechanism, and can realize that the speed ratio of the fan is greater than 1, namely the highest rotating speed of the fan is greater than the rotating speed of a crankshaft of an engine. However, the speed ratio is generally not greater than 1.4, because the speed ratio of the conventional speed raising mechanism is fixed and unchanged, the variation range of the rotating speed ratio in the meshing process of the fan is too large, the fan clutch exceeds the self slip requirement due to the too large variation range of the speed ratio, for example, the slip requirement of the silicon oil fan clutch is not greater than 8%, otherwise, the silicon oil is overheated to cause faults. In addition, the larger speed ratio can cause the belt and the belt pulley speed increasing mechanism of the engine to be easy to slip and fail.

The invention provides a variable-speed-ratio fan speed-up clutch scheme based on a double-row planetary gear mechanism, which can realize the following aims:

1. greater fan speed ratio: the fan speed ratio of more than 1.5 can be realized;

2. realizing variable speed ratio: the speed ratio of the fan can be changed from 1 to the designed highest speed ratio, so that the inner meshing of the fan clutch in a large speed ratio change range is avoided, and the condition that the meshing process of the fan clutch exceeds the self slip requirement is avoided.

Disclosure of Invention

The invention aims to provide a fan speed regulating device which can improve the speed ratio of a fan more safely.

In order to achieve the purpose, the invention adopts the following technical scheme:

a fan governor device comprising:

an output shaft;

the one-way bearing is sleeved outside the output shaft;

the input shaft is sleeved outside the one-way bearing and can drive the output shaft to rotate along one direction through the one-way bearing;

the clutch comprises a fixed wheel and a driving wheel;

the inner gear ring is connected to the input shaft;

the planetary gear mechanism set up in the ring gear, including sun gear and center on a plurality of planetary wheel set that the sun gear equipartition set up, the sun gear link firmly in the output shaft, the driving wheel is as the planet carrier, one planetary wheel set includes two intermeshing and rotate respectively connect in the planet wheel of driving wheel, one two of planetary wheel set in the planet wheel, one with the sun gear meshes mutually, another with the ring gear meshes mutually.

Preferably, the driving wheel is provided with a through hole, the output shaft penetrates through the through hole, and the fixed wheel and the planetary gear mechanism are respectively positioned on two sides of the driving wheel.

Preferably, the clutch is an electrically controlled silicone oil clutch.

Preferably, the ratio of the number of teeth of the ring gear to the number of teeth of the sun gear ranges from 6/4 to 7/4.

Preferably, the engine further comprises a fixing mechanism, and the fixed wheel is mounted on the engine body of the engine through the fixing mechanism.

Preferably, the fixing mechanism includes a rear housing and a bracket, the rear housing is mounted on the engine body of the engine through the bracket, the fixed wheel and the rear housing enclose to form an accommodating cavity, the output shaft, the one-way bearing, the input shaft, the inner gear ring and the planetary gear mechanism are all mounted in the accommodating cavity, the output shaft penetrates out of the fixed wheel, and the input shaft penetrates out of the rear housing.

Preferably, the fixed wheel is provided with a first boss, the first boss is provided with a first mounting hole, the rear shell is provided with a second boss, the second boss is provided with a second mounting hole, the first boss and the second boss are mutually attached, and the first mounting hole and the second mounting hole are communicated.

Preferably, the rear shell is further provided with a third boss, and the bracket is connected to the third boss.

Preferably, the number of the brackets is two, and the two brackets are symmetrically connected to two sides of the rear shell.

Preferably, the number of the third bosses is four, and each of the brackets is connected to two of the third bosses.

The invention has the beneficial effects that:

the inner gear ring is arranged on the input shaft, the planetary gear mechanisms are arranged on the clutch and the output shaft, the input shaft and the output shaft are in one-way linkage through the one-way bearing, when the clutch is separated, the one-way bearing is locked, the input shaft drives the output shaft to synchronously rotate, the speed ratio of the output shaft to the input shaft is 1, when the clutch is meshed, the output shaft realizes the equidirectional rotating speed exceeding the input shaft through the planetary gear mechanism, the one-way bearing is opened, so that the speed ratio of the output shaft to the input shaft is improved, compared with a speed-up mechanism with a belt pulley and a belt, the structure is simpler, the weight is lighter, when the fan is driven, the flow field at the rear part of the fan is optimized, the backpressure of the fan is reduced, the efficiency is improved, and the efficiency of a heat dissipation.

Drawings

FIG. 1 is a schematic structural diagram of a fan speed control device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the fan speed adjusting device according to the embodiment of the present invention without a bracket;

FIG. 3 is an exploded view of one orientation of the structure shown in FIG. 2;

FIG. 4 is an exploded view of the structure shown in FIG. 2 in another orientation;

fig. 5 is a schematic diagram of a power transmission structure of the fan speed adjusting device according to the embodiment of the invention.

In the figure:

1. an output shaft;

2. a one-way bearing;

3. an input shaft;

4. a clutch; 41. fixing the wheel; 411. a first boss; 42. a driving wheel;

5. an inner gear ring;

6. a planetary gear mechanism; 61. a sun gear; 62. a planet wheel;

7. a fixing mechanism; 71. a rear housing; 711. a second boss; 712. a third boss; 72. and (4) a bracket.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to 5, the present invention provides a fan speed adjusting device, which includes an output shaft 1, a one-way bearing 2, an input shaft 3, a clutch 4, an inner gear ring 5, and a planetary gear mechanism 6. The clutch 4 comprises a fixed wheel 41 and a movable wheel 42, the inner gear ring 5 is connected to the input shaft 3, the planetary gear mechanism 6 is arranged in the inner gear ring 5 and comprises a sun wheel 61 and a plurality of planetary gear sets which are uniformly distributed around the sun wheel 61, the sun wheel 61 is fixedly connected to the output shaft 1, the movable wheel 42 serves as a planet carrier, one planetary gear set comprises two planetary gears 62 which are mutually meshed and respectively rotatably connected to the movable wheel 42, one planetary gear 62 of one planetary gear set is meshed with the sun wheel 61, and the other planetary gear is meshed with the inner gear ring 5.

In the invention, an inner gear ring 5 is arranged on an input shaft 3, a planetary gear mechanism 6 is arranged on a clutch 4 and an output shaft 1, the input shaft 3 and the output shaft 1 are linked in a one-way mode through a one-way bearing 2, when the clutch 4 is separated, the one-way bearing 2 is locked, the input shaft 3 drives the output shaft 1 to synchronously rotate, the speed ratio of the output shaft 1 to the input shaft 3 is 1, when the clutch 4 is engaged, the output shaft 1 realizes the equidirectional rotating speed exceeding the input shaft 3 through the planetary gear mechanism 6, the one-way bearing 2 is opened, thereby achieving the lifting of the speed ratio of the output shaft 1 and the input shaft 3, compared with a speed lifting mechanism with a belt pulley and a belt matched, the structure is simpler, the weight is lighter, when the fan is driven, the flow field at the rear part of the fan is optimized, so that the backpressure of the fan is reduced, the efficiency is improved, and the efficiency of a heat dissipation system is further improved.

Specifically, a through hole is formed in the driving wheel 42, the output shaft 1 penetrates through the through hole, and the fixed wheel 41 and the planetary gear mechanism 6 are respectively located on two sides of the driving wheel 42. The above arrangement makes the power transmission from the input shaft 3 to the planetary gear mechanism 6 more stable and reliable.

In this embodiment, the clutch 4 is an electrically controlled silicone oil clutch, and the amount of silicone oil entering the clutch 4 is controlled within the allowable slip range, so that different relative rotation speeds between the fixed pulley 41 and the movable pulley 42 of the clutch 4 can be controlled, and through data calibration, the speed ratio between the output shaft 1 and the input shaft 3 can be accurately controlled according to the working condition requirements in practical application, thereby realizing stepless speed change, and further achieving better balance between the heat dissipation capacity and the fan power consumption.

The electrically controlled silicone oil clutch is a conventional device in the art, and the specific structure and the working principle thereof are not described herein again. Besides the electric control silicone oil clutch, the clutch 4 can also be a clutch with unlimited forms such as other hydraulic coupling type or friction clutch type plane friction, conical surface friction and the like.

More specifically, the ratio of the number of teeth of the ring gear 5 and the sun gear 61 ranges from 6/4 to 7/4. In the present embodiment, the gear ratio of the ring gear 5 to the sun gear 61 is 65: 43, the speed-up speed ratio is about 1.51, and besides, the design can be flexibly carried out according to actual requirements.

Optionally, the fan speed adjusting device further comprises a fixing mechanism 7, and the fixed wheel 41 is mounted on the engine body of the engine through the fixing mechanism 7.

Specifically, the fixing mechanism 7 includes a rear shell 71 and a bracket 72, the rear shell 71 is mounted on the engine body of the engine through the bracket 72, the fixed wheel 41 and the rear shell 71 enclose to form an accommodating cavity, the output shaft 1, the one-way bearing 2, the input shaft 3, the inner gear ring 5 and the planetary gear mechanism 6 are all mounted in the accommodating cavity, the output shaft 1 penetrates out of the fixed wheel 41 and is connected to the input end of the fan assembly, and the input shaft 3 penetrates out of the rear shell 71 and is connected to the crankshaft of the engine.

In the present embodiment, the input shaft 3 is connected to the crankshaft via a transition flange, which is not necessary and can be determined whether to be integrated with the input shaft 3 according to actual assembly conditions.

The output shaft 1 is connected with the fan assembly through threads and a flange connection mode: the rotating direction of the fan is anticlockwise when the fan assembly is seen from the engine body, and the threads connected with the fan assembly through the output shaft 1 are also in the tightening direction in the anticlockwise direction, so that the self-tightening function of the threads can be realized in the working process of the fan.

More specifically, the fixed wheel 41 is provided with a first boss 411, the first boss 411 is provided with a first mounting hole, the rear shell 71 is provided with a second boss 711, the second boss 711 is provided with a second mounting hole, the first boss 411 and the second boss 711 are attached to each other, the first mounting hole and the second mounting hole are communicated with each other, and the fixed wheel 41 and the rear shell 71 are connected into a whole through a fastener connected to the first mounting hole and the second mounting hole.

Specifically, the rear shell 71 is further provided with a third boss 712, the bracket 72 is connected to the third boss 712, the third boss 712 and the bracket 72 are respectively provided with a connecting hole, and a fastener is inserted into the connecting holes of the third boss 712 and the bracket 72 to fixedly connect the third boss and the bracket.

More specifically, the brackets 72 are provided in two, and the two brackets 72 are symmetrically connected to both sides of the rear case 71. The arrangement of two symmetrical brackets 72 makes the fixation of the rear shell 71 more stable and reliable.

In the present embodiment, four third bosses 712 are provided, each bracket 72 is connected to two third bosses 712, and the four third bosses 712 are located at four corners of the outer periphery of the rear case 71, so that the installation of the fan speed adjusting device is more balanced by being connected to the two brackets 72.

In actual operation, as shown in fig. 5:

disengaged state of the fixed sheave 41 and the movable sheave 42 of the clutch 4: when the water temperature of the engine is detected to be not high and the fan speed regulating device is not needed to work, the clutch 4 is in a disconnected state, at the moment, power is input from the crankshaft through the input shaft 3 and is directly transmitted to the output shaft 1 through the one-way bearing 2, at the moment, the one-way bearing 2 is locked and is transmitted to the fan assembly through the output shaft 1, at the moment, no rotating speed difference exists between the output shaft 1 and the input shaft 3, and all components of the fan speed regulating device, except the fixed wheel 41 and the rear shell 71, rotate around the central axis of the input shaft 3 at the same angular speed as the crankshaft of the engine.

The fan speed control device in this case corresponds to a rigid fan transition flange. The fan assembly can control the rotating speed of the fan by utilizing the self electric control clutch device according to the requirement of the heat dissipation system so as to achieve and maintain the heat balance state of the heat dissipation system.

Engagement state of fixed sheave 41 and movable sheave 42 of clutch 4: when the electric control clutch device of the fan assembly is fully engaged, the heat dissipation capacity of the engine is continuously increased, the rotating speed of the fan cannot meet the requirement at the moment, the control system sends out an instruction, and the clutch 4 in the fan speed adjusting device is engaged.

At the moment, power is input through the input shaft 3 and is transmitted to the output shaft 1 through the planetary gear, the driving wheel 42 serving as a planet carrier is fixed due to the meshing of the clutch 4, the input shaft 3 drives the inner gear ring 5 to rotate, the inner gear ring 5 can be converted into the same-direction rotation by the planetary gear mechanism 6 and is transmitted to the output shaft 1 with fewer teeth, the rotating speed is coaxially increased, the rotating direction of the inner ring and the outer ring of the one-way bearing 2 is the same as the rotating direction between the input shaft 3 and the output shaft 1, the rotating speed of the output shaft 1 is higher than that of the input shaft 3, the one-way bearing 2 is opened, and therefore the rotating speed difference.

In the control strategy, when the fan speed regulation device is engaged, the electric control clutch device of the fan assembly is engaged completely, and then the fan assembly is accelerated integrally, so that the slip of the electric control clutch device of the fan assembly is not changed too much, and the slip requirement can be met.

Can find out through above-mentioned control strategy, compare with traditional band pulley bent axle acceleration of rise structure, the fan speed adjusting device of this application is simpler to the requirement of engine front end train, can cancel an intermediate pulley support, three belt pulley, two belts at least, and whole weight is more advantageous, and engine front end system simplifies the back and has been equivalent to optimizing fan rear portion flow field, and the fan backpressure reduces, and the efficiency of fan improves, has further promotion to cooling system efficiency.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fan governor device, comprising:

an output shaft (1);

the one-way bearing (2) is sleeved on the outer side of the output shaft (1);

the input shaft (3) is sleeved on the outer side of the one-way bearing (2), and the input shaft (3) can drive the output shaft (1) to rotate along one direction through the one-way bearing (2);

a clutch (4) including a fixed pulley (41) and a movable pulley (42);

an inner gear ring (5) connected to the input shaft (3);

planetary gear mechanism (6), set up in ring gear (5), include sun gear (61) and center on a plurality of planetary gear sets that sun gear (61) equipartition set up, sun gear (61) link firmly in output shaft (1), driving wheel (42) are as the planet carrier, one planetary gear set includes two intermeshing and rotates respectively connect in planet wheel (62) of driving wheel (42), one two of planetary gear set in planet wheel (62), one with sun gear (61) mesh mutually, another with ring gear (5) mesh mutually.

2. The fan speed regulating device according to claim 1, wherein a through hole is formed in the driving wheel (42), the output shaft (1) is arranged in the through hole in a penetrating manner, and the fixed wheel (41) and the planetary gear mechanism (6) are respectively positioned on two sides of the driving wheel (42).

3. Fan speed regulating device according to claim 1, characterized in that the clutch (4) is an electrically controlled silicone oil clutch.

4. Fan speed regulating device according to claim 1, characterized in that the ratio of the number of teeth of the ring gear (5) and the sun gear (61) is in the range of 6/4-7/4.

5. A fan speed regulating device according to any one of claims 1 to 3, further comprising a fixing mechanism (7), wherein the fixed wheel (41) is mounted on the body of the engine through the fixing mechanism (7).

6. The fan speed regulation device according to claim 5, wherein the fixing mechanism (7) comprises a rear shell (71) and a support (72), the rear shell (71) is mounted on a body of an engine through the support (72), the fixed wheel (41) and the rear shell (71) are enclosed to form an accommodating cavity, the output shaft (1), the one-way bearing (2), the input shaft (3), the inner gear ring (5) and the planetary gear mechanism (6) are mounted in the accommodating cavity, the output shaft (1) penetrates out of the fixed wheel (41), and the input shaft (3) penetrates out of the rear shell (71).

7. The fan speed regulating device according to claim 6, wherein the fixed wheel (41) is provided with a first boss (411), the first boss (411) is provided with a first mounting hole, the rear shell (71) is provided with a second boss (711), the second boss (711) is provided with a second mounting hole, the first boss (411) and the second boss (711) are attached to each other, and the first mounting hole and the second mounting hole are opposite to each other and communicated.

8. The fan speed regulation device of claim 6, wherein the rear housing (71) is further provided with a third boss (712), and the bracket (72) is connected to the third boss (712).

9. The fan speed regulation device according to claim 8, wherein the number of the brackets (72) is two, and the two brackets (72) are symmetrically connected to both sides of the rear case (71).

10. The fan speed regulation device of claim 5, wherein the third bosses (712) are provided in four, and each of the brackets (72) is connected to two of the third bosses (712).