CN106762790B

CN106762790B - Fan transmission device for cooling automobile engine

Info

Publication number: CN106762790B
Application number: CN201611268241.XA
Authority: CN
Inventors: 徐时聪; 樊美刚; 高奂
Original assignee: Zhejiang Nessral Machinery Co ltd
Current assignee: Zhejiang Nessral Machinery Co ltd
Priority date: 2016-12-31
Filing date: 2016-12-31
Publication date: 2023-07-11
Anticipated expiration: 2036-12-31
Also published as: CN106762790A

Abstract

The invention provides a fan transmission device for cooling an automobile engine, and belongs to the technical field of machinery. The bearing solves the problem of how to enable grease to quickly and effectively reach into a channel of a bearing for lubrication. The fan transmission device for the automobile engine cooling comprises a transmission shaft and an oil injection channel, wherein a supporting sleeve is sleeved outside the transmission shaft, a first bearing and a second bearing are respectively arranged between the inner walls of two ends of the supporting sleeve and the transmission shaft, a working cavity is formed between the inner end of the first bearing and the inner end of the second bearing, a fan blade spacer capable of rotating along with the transmission shaft is arranged in the working cavity, the fan blade spacer divides the working cavity into two oil storage cavities communicated with the oil injection channel, and the fan blade spacer is provided with a fan impeller capable of generating thrust towards the oil storage cavities at two sides. The device is characterized in that the fan blade spacer bush with a special structure is designed, and the oil drain hole is designed, so that grease in the working cavity can rapidly and effectively reach the groove of the bearing for lubrication, and the phenomenon of oil throwing can be avoided, so that the device is ensured to be clean.

Description

Fan transmission device for cooling automobile engine

Technical Field

The invention belongs to the technical field of machinery, and relates to a fan transmission device for cooling an automobile engine.

Background

At present, in a cooling system of a rear engine of a public bus, an engine cooling water tank is arranged on the side surface of the engine, and an induced draft fan is adopted to cool the cooling water tank. As a fan for helping the cooling water tank to radiate heat, the power thereof is generally obtained by a fan driving wheel which is fixedly connected with the fan driving wheel and can drive the fan driving wheel to rotate, and a V belt which is connected between the fan driving wheel and the engine crank wheel.

Such as chinese patent [ application number: 201210047978.4; application publication number: CN 103291649a discloses a driving fan wheel for cooling an automobile, which comprises a base, a fixed support arranged on the base, a fan wheel and a fan wheel shaft, wherein the fixed support is provided with a circular arc-shaped groove, the center of the groove is provided with an oil filling hole, a through type pressure oil filling cup is arranged in the oil filling hole, a single-sided sealing bearing is arranged at the joint of the fan wheel shaft and the fixed support, and two sides of the fixed support are respectively provided with an oil blocking inner ring and an oil blocking outer ring matched with the oil blocking inner ring.

In the using process of the transmission fan wheel for cooling the automobile, lubricating oil needs to be filled periodically to maintain the bearings, and after new grease filled during maintenance enters two bearing working cavities through the through type pressure oil filling cup, the grease is easy to adhere to the inner walls of the working cavities and the outer peripheral surfaces of the transmission shafts, so that the grease cannot effectively reach bearing channels at two ends to lubricate; meanwhile, when the bearing rotates at a high speed, grease cannot be effectively lubricated on the bearing channel surface and the balls due to centrifugal force and rolling of the bearing balls, so that grease in the two bearing working cavities cannot enter the effective working area of the bearing; therefore, the lubrication effect of the transmission fan wheel is poor, and the transmission performance of the bearing cannot be ensured, so that the heat dissipation performance of the fan is affected; in addition, after the transmission fan wheel for automobile cooling is maintained and oiled for many times, grease can be extruded from the gap between the oil baffle inner ring and the oil baffle outer ring, and because the grease is not provided with a dredging structure, the extruded grease easily flows to and adheres to the belt pulley or the sealing gasket, and when the part rotates, the grease adhered to the part is thrown to other positions of the engine compartment due to the action of centrifugal force, so that the engine compartment is polluted by greasy dirt.

Disclosure of Invention

The invention aims at solving the problems in the prior art, and provides a fan transmission device for cooling an automobile engine, which aims at solving the technical problems that grease can quickly and effectively reach a channel of a bearing for lubrication.

The aim of the invention can be achieved by the following technical scheme: the fan transmission device for cooling the automobile engine comprises a transmission shaft and an oil injection channel, wherein a supporting sleeve is sleeved outside the transmission shaft, a first bearing and a second bearing are respectively arranged between the inner walls of two ends of the supporting sleeve and the transmission shaft, and a working cavity is formed between the inner end of the first bearing and the inner end of the second bearing.

Compared with the prior art, the working principle of the fan transmission device for the automobile engine cooling is that the fan sleeve is arranged in the working cavity between the first bearing and the second bearing, the working cavity is divided into two oil storage cavities by the fan sleeve, and grease in the two oil storage cavities can be quickly and effectively pushed into channels corresponding to the first bearing and the second bearing by the fan impeller on the fan sleeve; specifically, when the transmission device needs oiling maintenance, by injecting grease into the oiling channel, the oiling channel can convey the grease into the oil storage cavity communicated with the first channel of the bearing and into the oil storage cavity communicated with the second channel of the bearing; because the gap between the fan blade spacer bush and the inner wall of the supporting bush is very small, that is, the two oil storage cavities are relatively independent; when the fan blade spacer rotates along with the transmission shaft, the fan blade wheel on the fan blade spacer can stir grease in the two oil storage cavities to flow rapidly, and the grease in the working cavity is not easy to generate turbulence due to the relative independence of the two oil storage cavities, so that the grease in the two oil storage cavities is ensured not to interfere with each other to influence the pushing of the grease, and the grease is ensured to effectively reach the grooves of the bearing; meanwhile, due to the design of the relatively independent oil storage cavities, a pressurizing cavity can be formed between the fan blade wheel and the corresponding bearings at the two ends more easily when the fan blade wheel rotates, and then the thrust in the first direction and the second direction of the bearing generated by the rotation of the fan blade wheel is matched, so that grease in each oil storage cavity can overcome the centrifugal force generated by the bearing and can be quickly thrown into a channel corresponding to the bearing, and the grease can quickly and effectively reach the channel of the bearing to lubricate.

In the fan transmission device for cooling the automobile engine, the fan impeller is annular, a plurality of fan blade teeth which are circumferentially arranged along the fan impeller are uniformly and integrally formed on the end face of each end of the fan blade impeller, two sides of each fan blade tooth are provided with an oil pushing surface and an oil guiding inclined surface, the oil pushing surface is opposite to the inner wall of the supporting sleeve, and the oil guiding inclined surface is opposite to the inner end face of the corresponding bearing. The oil pushing surface is opposite to the inner wall of the supporting sleeve, so that the oil pushing surface can push the oil in the oil storage cavity in the process of rotating relative to the supporting sleeve, the oil in the oil storage cavity is in a flowing state, the oil guiding inclined surface can generate thrust in the rotating process, and the oil guiding inclined surface is opposite to the inner end surface of the corresponding bearing, so that the oil can be thrown to the direction of the corresponding bearing channel, and the oil can quickly and effectively enter the bearing channel for lubrication through the cooperation of the oil pushing surface and the oil guiding inclined surface.

In the fan transmission device for cooling the automobile engine, the oil pushing surfaces and the oil guiding inclined surfaces of two adjacent blade teeth are connected and form a V-shaped opening facing the corresponding bearing channel. Through the design above, the flabellum teeth on every terminal surface on the fan impeller are all continuous to can form the V-arrangement mouth towards corresponding bearing channel between two adjacent flabellum teeth, make the fan impeller take place when rotating like this, the flabellum teeth on the fan impeller can accelerate the propelling movement to the grease of oil storage intracavity, thereby make the grease get into in the channel of corresponding bearing fast and effectively and realize effective lubrication.

In the fan transmission device for cooling the automobile engine, the fan blade spacer comprises a cylindrical sleeve, the sleeve is sleeved on the transmission shaft, two ends of the sleeve respectively lean against the inner rings of the first bearing and the second bearing, the fan blade wheel is positioned on the middle section of the sleeve, and two ends of the sleeve are provided with oil outlet grooves communicated with the corresponding oil storage cavity and the oil injection channel. The oil outlet is positioned at the two ends of the sleeve and the two ends of the sleeve are abutted against the bearing inner rings, so that the oil outlet is positioned at a position closest to the bearing channel, namely, in the oiling process, grease is firstly distributed in an oil storage cavity near the bearing channel opening, and therefore, when the fan blade spacer rotates, the grease can enter the bearing channel at the fastest speed to lubricate, and the bearing is prevented from being unnecessarily worn after being rotated for a long time due to the fact that the grease enters the bearing channel; meanwhile, the fan blade sleeve is pressed by the inner rings of the first bearing and the second bearing through the sleeve to rotate along with the transmission shaft, so that the installation of all parts on the transmission shaft is facilitated.

In the fan transmission device for cooling the automobile engine, the oil injection channel is positioned in the transmission shaft, an annular oil passing gap communicated with the oil injection channel is formed between the sleeve and the transmission shaft, one end of the oil passing gap is communicated with an oil outlet groove at the corresponding end of the sleeve, and the other end of the oil passing gap is communicated with an oil outlet groove at the corresponding other end of the sleeve. Because the space of the oil passing gap is smaller, that is to say, the oil passing gap can pressurize the grease flowing in from the oil injection channel, and the two ends of the oil passing gap are respectively communicated with the oil passing grooves at the two ends of the sleeve, so that the grease in the oil passing gap can quickly enter the oil storage cavity after being pressurized and part of the grease can be directly sprayed into the bearing channel close to the oil passing groove, and the grease can quickly and effectively reach the bearing channel for lubrication.

In the fan transmission device for cooling the automobile engine, the oil guide inclined plane is in a fan shape, and the central angle of the oil guide inclined plane is 8-45 degrees. Through reasonably selecting the central angle of the oil guiding inclined plane, the fan impeller can generate optimal pushing force according to different rotating speeds of the transmission shaft, so that grease can quickly and effectively reach the inside of a channel of the bearing for lubrication.

In the fan transmission device for cooling the automobile engine, the fan blade wheel is sleeved and fixedly connected to the outer peripheral surface of the sleeve, the fan blade wheel is made of plastic materials, and the sleeve is made of metal materials. The fan blade spacer is designed in a split mode, the metal strength is high, reliable connection and support of the sleeve can be guaranteed, the plastic plasticity is strong, and the fan blade with a complex structure can be formed by injection molding, so that the fan blade spacer is more convenient to manufacture and process by utilizing the combination process of metal and plastic, and the manufacturing cost is reduced; alternatively, the fan wheel and sleeve may be of unitary construction.

In the fan transmission device for cooling the automobile engine, at least one clamping hole is formed in the outer peripheral surface of the sleeve, clamping columns corresponding to the clamping holes are formed in the inner peripheral surface of the fan blade wheel, and the clamping columns are clamped in the clamping holes. The sleeve and the fan impeller are fixedly connected through the clamping fit of the clamping column and the clamping hole, so that the sleeve and the fan impeller can be quickly disassembled and assembled, and the fan impeller on the fan spacer can be quickly and conveniently replaced and maintained.

In the fan transmission device for cooling the automobile engine, the end part of the transmission shaft is provided with the oil injection nozzle communicated with the oil inlet of the oil injection passage, the oil injection passage comprises a main oil passage arranged along the axial direction and a branch oil passage arranged along the radial direction, and oil outlets at two ends of the branch oil passage are positioned in the middle of the oil passing gap. Through the design, the grease in the oil filling duct can synchronously enter the two oil storage cavities through the oil through gap and the oil outlet groove, so that the grease can be stored in the two oil storage cavities, and the fan blade spacer is ensured to be capable of conveying the grease into the bearing channel.

In the fan transmission device for cooling the automobile engine, the fan transmission device further comprises a fan driving wheel capable of driving the transmission shaft to rotate, the transmission shaft is further sleeved with a shaft sleeve, two ends of the shaft sleeve are respectively abutted against an inner ring of the first bearing and an inner end face of the fan driving wheel, an oil seal seat is fixedly connected to an end face of the first bearing, the oil seal seat is sleeved on the shaft sleeve, an oil seal I opposite to a channel of the first bearing is arranged between the oil seal seat and the shaft sleeve, a first sealing cavity is formed between the oil seal I and the outer end of the first bearing, and an oil drain hole I which enables the first sealing cavity to be communicated with the outside is formed in the periphery of the oil seal seat. The outer end of the bearing I is sealed through the sealing structure formed by the oil seal seat and the oil seal I, and meanwhile, the oil drain hole I is designed on the oil seal seat, so that ventilation is realized, and the problem that grease cannot be injected in a complete sealing state is avoided; on the other hand, an oil discharge guide channel is provided for the oil discharged from the first bearing, and the first oil discharge hole is designed on the outer peripheral surface of the oil seal seat, so that the discharged oil can be prevented from adhering to rotating parts such as a fan driving wheel and the like at the outer side of the oil seal seat, the oil throwing phenomenon is avoided, and the cleaning of the device is further ensured.

In the fan transmission device for cooling the automobile engine, the end face of one end, provided with the bearing II, of the supporting sleeve is fixedly connected with the connecting disc, the connecting disc is sleeved on the transmission shaft, an oil seal II is arranged between the inner peripheral face of the connecting disc and the outer peripheral face of the transmission shaft, a sealing cavity II is formed between the connecting disc and the outer end of the bearing II by the oil seal II, and an oil drain hole II which enables the sealing cavity II to be communicated with the outside is formed in the outer periphery of the connecting disc. The outer end of the bearing II is sealed through the sealing structure formed by the connecting disc and the oil seal II, and meanwhile, the oil drain hole II is designed on the connecting disc, so that ventilation is realized, and the problem that grease cannot be injected in a complete sealing state is avoided; on the other hand provides an oil extraction guide channel for the oil of the interior exhaust of bearing two, because oil drain hole two designs on the outer peripheral face of connection pad, can ensure like this that the exhaust oil can not adhere to on the rotating part in connection pad outside to avoid appearing getting rid of oily phenomenon, and then guarantee the cleanness of this device.

Compared with the prior art, the fan transmission device for cooling the automobile engine has the following advantages: the device is characterized in that the fan blade spacer bush with a special structure is designed, and the oil drain hole is designed, so that grease in the working cavity can rapidly and effectively reach the groove of the bearing for lubrication, and the phenomenon of oil throwing can be avoided, so that the device is ensured to be clean.

Drawings

Fig. 1 is a schematic cross-sectional view of a fan transmission for cooling an engine of the present automobile.

Fig. 2 is an enlarged partial schematic view at a in fig. 1.

FIG. 3 is a schematic view of a fan blade spacer.

Fig. 4 is a schematic diagram of a second embodiment of the fan blade spacer.

Fig. 5 is a schematic diagram of a third embodiment of the fan blade spacer.

FIG. 6 is a schematic cross-sectional view of the present fan blade spacer.

In the figure, 1, a transmission shaft; 2. an oil injection passage; 2a1, a main oil duct; 2a2, oil distribution channels; 3. a support sleeve; 4. a first bearing; 5. a second bearing; a. a channel; 6. a working chamber; 61. an oil storage chamber; 7. a fan blade spacer; 71. a fan impeller; 711. blade teeth; 711a, pushing oil surface; 711b, oil guiding inclined plane; 711c, V-shaped mouth; 712. a clamping column; 72. a sleeve; 721. an oil outlet groove; 722. a clamping hole; 8. an oil passing gap; 9. an oil filling nozzle; 10. a shaft sleeve; 11. an oil seal seat; 12. sealing with oil; 13. sealing the first cavity; 14. an oil drain hole I; 15. a connecting disc; 16. oil sealing is conducted; 17. sealing the second cavity; 18. oil drain holes II and 19 and a fan driving wheel.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

The fan transmission device for cooling the automobile engine comprises a transmission shaft 1, an oil injection channel 2, a main oil channel 2a1, an oil distribution channel 2a2, a supporting sleeve 3, a first bearing 4, a second bearing 5, a channel a, a working cavity 6, an oil storage cavity 61, a fan blade spacer 7, a fan blade wheel 71, a fan blade tooth 711, an oil pushing surface 711a, an oil guiding inclined surface 711b, a V-shaped opening 711c, a clamping column 712, a sleeve 72, an oil outlet groove 721, a clamping hole 722, an oil passing gap 8, an oil filling nozzle 9, a shaft sleeve 10, an oil seal seat 11, a first oil seal 12, a first sealing cavity 13, an oil drain hole 14, a connecting disc 15, a second sealing cavity 16, a second sealing cavity 17, a second oil drain hole 18 and a fan driving wheel 19.

Specifically, as shown in fig. 1, the fan transmission device for cooling an engine of the present automobile includes a transmission shaft 1 provided in a horizontal direction and a fan drive wheel 19 capable of driving the transmission shaft 1 to rotate. The transmission shaft 1 is sleeved with a supporting sleeve 3, and a first bearing 4 and a second bearing 5 are respectively arranged between the inner walls of the two ends of the supporting sleeve 3 and the transmission shaft 1. The transmission shaft 1 is also sleeved with a shaft sleeve 10, and two ends of the shaft sleeve 10 respectively lean against the inner ring of the first bearing 4 and the inner end face of the fan driving wheel 19. The end face of one end of the supporting sleeve 3 provided with the bearing I4 is fixedly connected with an oil seal seat 11 through bolts. The oil seal seat 11 is sleeved on the shaft sleeve 10, an oil seal I12 opposite to the channel a of the bearing I4 is arranged between the oil seal seat 11 and the shaft sleeve 10, and a sealing cavity I13 is formed between the oil seal seat 11 and the outer end of the bearing I4 by the oil seal I12. The periphery of the oil seal seat 11 is provided with an oil drain hole I14 which enables the sealing cavity I13 to be communicated with the outside; the end face of the supporting sleeve 3 provided with the second bearing 5 is fixedly connected with a connecting disc 15 through bolts. The connecting disc 15 is sleeved on the transmission shaft 1, and an oil seal two 16 is arranged between the inner peripheral surface of the connecting disc 15 and the outer peripheral surface of the transmission shaft 1, and a sealing cavity two 17 is formed between the connecting disc 15 and the outer end of the bearing two 5 by the oil seal two 16. The periphery of the connecting disc 15 is provided with a second oil drain hole 18 which enables the second sealing cavity 17 to be communicated with the outside.

The first bearing 4 is a cylindrical roller bearing, and the second bearing 5 is a duplex angular contact bearing. A working cavity 6 is formed between the inner end of the first bearing 4 and the inner end of the second bearing 5, an oil injection duct 2 is arranged in the transmission shaft 1, a fan blade spacer 7 capable of rotating along with the transmission shaft 1 is arranged in the working cavity 6, the fan blade spacer 7 divides the working cavity 6 into two oil storage cavities 61, the oil injection duct 2 can respectively convey grease into the two oil storage cavities 61, and the fan blade spacer 7 is provided with fan blade wheels 71 capable of generating thrust towards the oil storage cavities 61 at two sides.

More specifically, as shown in fig. 1 and 2, the fan blade spacer 7 includes a cylindrical sleeve 72, and the sleeve 72 is sleeved on the transmission shaft 1 and two ends of the sleeve respectively abut against the inner rings of the first bearing 4 and the second bearing 5. The fan impeller 71 is located on the middle section of the sleeve 72, and both ends of the sleeve 72 are provided with oil outlet grooves 721 communicating with the corresponding oil storage chamber 61 and the oil filling channel 2. An annular oil passing gap 8 communicated with the oil filling duct 2 is formed between the sleeve 72 and the transmission shaft 1. The end part of the transmission shaft 1 is provided with an oiling nozzle 9 communicated with the oil inlet of the oiling channel 2, the oiling channel 2 comprises a main oil channel 2a1 arranged along the axial direction and a branch oil channel 2a2 arranged along the radial direction, and the oil outlets at the two ends of the branch oil channel 2a2 are positioned in the middle part of the oiling gap 8. One end of the oil passing gap 8 is communicated with an oil outlet groove 721 at the corresponding end of the sleeve 72, and the other end of the oil passing gap 8 is communicated with the oil outlet groove 721 at the corresponding other end of the sleeve 72. The number of oil grooves 721 formed in the end of the sleeve 72 can be designed according to the number of bearings at each end of the supporting sleeve 3. In this embodiment, an oil outlet 721 is disposed at the end of the sleeve 72 near the first bearing 4, and two oil outlets 721 are disposed at the end of the sleeve 72 near the second bearing 5.

As shown in fig. 3 and 4, the fan impeller 71 is annular, and a plurality of blade teeth 711 arranged along the circumferential direction of the fan impeller 71 are formed on the end surface of each end of the fan impeller 71, and both sides of the blade teeth 711 are provided with an oil pushing surface 711a and an oil guiding inclined surface 711b. The oil pushing surface 711a is opposed to the inner wall of the bearing housing 3, and the oil guiding inclined surface 711b is opposed to the inner end surface of the corresponding bearing. The oil pushing surfaces 711a and the oil guiding inclined surfaces 711b of the adjacent two blade teeth 711 are connected and form a V-shaped opening 711C facing the corresponding bearing channel a. As shown in fig. 5, the oil guiding inclined surface 711b has a fan shape, and the central angle of the oil guiding inclined surface 711b is 8 ° to 45 °.

In this embodiment, as shown in fig. 6, the fan blade spacer 7 adopts a split structure. The fan wheel 71 is sleeved and fixedly connected on the outer peripheral surface of the sleeve 72, the fan wheel 71 is made of plastic materials, and the sleeve 72 is made of metal materials. The sleeve 72 has at least one engagement hole 722 on its outer peripheral surface, and the fan impeller 71 has engagement posts 712 on its inner peripheral surface, which correspond to the engagement holes 722, and the engagement posts 712 engage in the engagement holes 722.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as the drive shaft 1, the oil gallery 2, the main oil gallery 2a1, the oil distribution gallery 2a2, the bearing housing 3, the bearing housing 4, the bearing housing 5, the channel a, the working chamber 6, the oil storage chamber 61, the vane spacer 7, the vane wheel 71, the vane teeth 711, the oil pushing surface 711a, the oil guiding inclined surface 711b, the V-shaped opening 711c, the clamping post 712, the sleeve 72, the oil outlet groove 721, the clamping hole 722, the oil passing gap 8, the oil nozzle 9, the sleeve 10, the oil seal seat 11, the oil seal housing 12, the seal housing 13, the oil drain housing 14, the connection disc 15, the oil seal housing 16, the seal housing 17, the oil drain housing 18, the fan drive wheel 19, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.

Claims

1. The fan transmission device for cooling the automobile engine comprises a transmission shaft (1) and an oil injection channel (2), wherein a supporting sleeve (3) is sleeved outside the transmission shaft (1), a first bearing (4) and a second bearing (5) are respectively arranged between the inner walls of two ends of the supporting sleeve (3) and the transmission shaft (1), a working cavity (6) is formed between the inner end of the first bearing (4) and the inner end of the second bearing (5), and the fan transmission device is characterized in that a fan blade spacer (7) capable of rotating along with the transmission shaft (1) is arranged in the working cavity (6), the fan blade spacer (7) divides the working cavity (6) into two oil storage cavities (61) communicated with the oil injection channel (2), and the fan blade spacer (7) is provided with fan blade wheels (71) capable of generating thrust towards the oil storage cavities (61) on two sides; the fan blade spacer bush (7) comprises a cylindrical sleeve (72), oil outlet grooves (721) which are communicated with a corresponding oil storage cavity (61) and an oil injection channel (2) are formed in two ends of the sleeve (72), the oil injection channel (2) is located in a transmission shaft (1), an annular oil through gap (8) which is communicated with the oil injection channel (2) and is formed between the sleeve (72) and the transmission shaft (1), one end of the oil through gap (8) is communicated with the oil outlet groove (721) at the corresponding end of the sleeve (72), and the other end of the oil through gap (8) is communicated with the oil outlet groove (721) at the corresponding other end of the sleeve (72).

2. The fan transmission device for cooling an automobile engine according to claim 1, wherein the impeller wheel (71) is annular, a plurality of impeller teeth (711) are uniformly formed on the end surface of each end of the impeller wheel (71) and are circumferentially arranged along the impeller wheel (71), two sides of the impeller teeth (711) are provided with oil pushing surfaces (711 a) and oil guiding inclined surfaces (711 b), the oil pushing surfaces (711 a) are opposite to the inner wall of the supporting sleeve (3), and the oil guiding inclined surfaces (711 b) are opposite to the inner end surfaces of the corresponding bearings.

3. A fan transmission for cooling an automobile engine according to claim 2, wherein the oil-pushing surfaces (711 a) of the adjacent two blade teeth (711) are in contact with the oil-guiding inclined surfaces (711 b) and form a V-shaped opening (711C) facing the corresponding bearing channel (a).

4. A fan transmission for cooling an automobile engine according to claim 2 or 3, wherein the oil guiding inclined surface (711 b) has a fan shape, and the central angle of the oil guiding inclined surface (711 b) is 8 ° to 45 °.

5. The fan transmission for cooling an automobile engine according to claim 1, wherein the sleeve (72) has at least one engagement hole (722) on an outer peripheral surface thereof, and the impeller (71) has engagement posts (712) on an inner peripheral surface thereof corresponding to the engagement holes (722), and the engagement posts (712) are engaged in the engagement holes (722).

6. The fan transmission for cooling an automobile engine according to claim 1, wherein an oil filler neck (9) communicated with an oil inlet of an oil filler channel (2) is arranged on an end portion of the transmission shaft (1), the oil filler channel (2) comprises a main oil channel (2 a 1) arranged along an axial direction and a branch oil channel (2 a 2) arranged along a radial direction, and oil outlets at two ends of the branch oil channel (2 a 2) are positioned in the middle of an oil passing gap (8).

7. A fan transmission device for cooling an automobile engine according to claim 1, 2 or 3, characterized in that the fan transmission device further comprises a fan driving wheel (19) capable of driving the transmission shaft (1) to rotate, the transmission shaft (1) is further sleeved with a shaft sleeve (10), two ends of the shaft sleeve (10) respectively lean against an inner ring of the first bearing (4) and an inner end face of the fan driving wheel (19), an oil seal seat (11) is fixedly connected to an end face of the first bearing (4) mounted on the supporting sleeve (3), the oil seal seat (11) is sleeved on the shaft sleeve (10), an oil seal (12) opposite to a channel (a) of the first bearing (4) is mounted between the oil seal seat (11) and the shaft sleeve (10), a first sealing cavity (13) is formed between the oil seal seat (11) and an outer end of the first bearing (4), and an oil drain hole (14) for enabling the first sealing cavity (13) to be communicated with the outside is formed in the outer periphery of the oil seal seat (11).

8. A fan transmission device for cooling an automobile engine according to claim 1, 2 or 3, wherein the end face of the bearing sleeve (3) provided with the bearing second (5) is fixedly connected with a connecting disc (15), the connecting disc (15) is sleeved on the transmission shaft (1), an oil seal second (16) is arranged between the inner peripheral surface of the connecting disc (15) and the outer peripheral surface of the transmission shaft (1), a seal cavity second (17) is formed between the connecting disc (15) and the outer end of the bearing second (5) by the oil seal second (16), and an oil drain hole second (18) which enables the seal cavity second (17) to be communicated with the outside is formed on the outer periphery of the connecting disc (15).