CN216545731U - Four-wheel drive transmission system for racing car - Google Patents

Abstract

The utility model discloses a four-wheel drive transmission system for racing cars, which comprises a rear drive axle device, a front drive axle device and a transmission shaft for connecting the rear drive axle device and the front drive axle device; the rear drive axle device comprises a rear axle housing, a power assembly and a transfer case are fixedly connected outside the rear axle housing, and a rear axle differential and a first input shaft extending out of the rear axle housing are arranged in the rear axle housing; a first output shaft extending out of the transfer case is arranged in the transfer case; the output shaft of the power assembly is connected with the first input shaft, and the rear axle differential mechanism is provided with two rear wheel half shaft ball cages which are distributed left and right and used for driving rear wheels to rotate. The utility model has the following beneficial effects: 1. the transfer case is arranged on the front axle housing, and the power is divided into two parts, so that one set of power drives four wheels to rotate; 2. the speed reducer and the limited slip differential are integrated into a whole, the cross-country performance of the whole automobile is improved, the racing automobile is more suitable for cross-country working conditions, and the speed reducer and the limited slip differential have the advantages of simple structure, small occupied space, strong operability, convenience in installation and the like.

Description

Four-wheel drive transmission system for racing car

Technical Field

The utility model relates to the field of racing car driving systems, in particular to a four-wheel drive transmission system for a racing car.

Background

Because most of the conditions of the racing cars are that the racing cars run on the non-paved road surface full of broken stones and muddy, the working condition is severe. The traditional rear wheel driving scheme only provides power by a rear wheel, and has poor performances such as dynamic property, trafficability and the like. Two-wheel drive vehicle drive wheels can produce 100% slip in sandy, muddy, etc. terrain, making the vehicle unable to produce effective traction. At present, some motorcades adopt four-wheel drive and four-wheel drive with time sharing, the former adopts more electromagnetic clutch and is limited by the sensitivity and algorithm of a sensor, the motorcade is not greatly suitable for complex racing conditions needing quick response, the racing conditions are easy to be trapped, the escaping capability is more complete, the four-wheel drive and the four-wheel drive with time sharing are weaker, and the latter adopts a pure mechanical structure mostly, so that the reliability of the system is guaranteed, but the mechanism has overlarge weight, is lighter than racing, is paradox with miniaturization concept, is more difficult to switch and operate, and is not beneficial to racing driving of a driver.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a four-wheel drive transmission system for racing cars to improve the off-road performance and the ability to escape from trouble.

In order to achieve the above object, the present invention adopts the following technical solutions.

A four-wheel drive transmission system for racing cars comprises a rear drive axle device, a front drive axle device and a transmission shaft for connecting the rear drive axle device and the front drive axle device; the rear drive axle device comprises a rear axle housing, a power assembly and a transfer case are fixedly connected outside the rear axle housing, and a rear axle differential and a first input shaft extending out of the rear axle housing are arranged in the rear axle housing; a first output shaft extending out of the transfer case is arranged in the transfer case; an output shaft of the power assembly is connected with a first input shaft, and the rear axle differential mechanism is provided with two rear wheel half shaft ball cages which are distributed left and right and used for driving rear wheels to rotate;

the front driving axle device comprises a front axle housing, a second input shaft extending out of the front axle housing is arranged in the front axle housing, a front axle differential mechanism is arranged in the front axle housing, and the front axle differential mechanism is provided with two front wheel half-axle ball cages which are distributed left and right and are used for driving front wheels to rotate;

the tail end of the transmission shaft is connected with the first output shaft, and the head end of the transmission shaft is connected with the second input shaft.

Further, the power assembly comprises an engine and a CVT reduction box, wherein an output shaft of the engine is connected with an input shaft of the CVT reduction box, and an output shaft of the CVT reduction box is connected with the first input shaft.

Furthermore, a first gear is arranged on a first input shaft positioned in the rear axle housing, an intermediate shaft is arranged in the rear axle housing, and one end of the intermediate shaft penetrates through the rear axle housing and extends into the transfer case; a second gear meshed with the first gear is arranged on the intermediate shaft; the end part of the intermediate shaft positioned in the transfer case is provided with a first bevel gear, and one end of the first output shaft positioned in the transfer case is connected with a second bevel gear meshed with the first bevel gear.

Furthermore, a third gear is also arranged on the intermediate shaft positioned in the rear axle housing;

the rear axle differential is a limited slip differential, the limited slip differential comprises a differential shell, the outer wall of the differential shell is connected with a differential gear ring meshed with a third gear, the end parts of the two rear wheel half axle ball cages extending into the differential shell are provided with third bevel gears, the differential shell is internally provided with four planetary gears connected through a cross axle, and the four planetary gears are simultaneously meshed with the third bevel gears on the two rear wheel half axle ball cages; a left thrust pressure plate and a right thrust pressure plate are arranged in the differential shell, and the left thrust pressure plate and the right thrust pressure plate can axially move;

a plurality of parallel half axle friction plates are respectively arranged on the rear wheel half axle ball cages on the left side and the right side, and a differential case friction plate which is inserted between two adjacent half axle friction plates is arranged in the differential case; a plurality of compression springs are arranged between the left thrust pressure plate and the right thrust pressure plate, four pairs of left cutting angles and four pairs of right cutting angles are symmetrically arranged on the opposite surfaces of the left thrust pressure plate and the right thrust pressure plate, each pair of left cutting angles and each pair of right cutting angles form a quadrangle in a surrounding manner, each end part of the cross shaft is provided with a driving block, and each driving block is correspondingly positioned in one quadrangle;

every left corner cut contains two corner cut faces, and every right corner cut contains two corner cut faces, and every pair of left corner cut and right corner cut constitute a quadrangle, and quadrangle's left contained angle equals right contained angle, and preceding contained angle is less than back contained angle.

Furthermore, the left front end and the right front end of the driving block are respectively provided with a chamfer inclined plane matched with the quadrilateral front included angle.

Further, the front axle differential is an open differential.

Further, the gear ratio of the first gear and the second gear is 3.529; the transmission ratio of the first bevel gear and the second bevel gear is 1.

Furthermore, the rear axle housing, the front axle housing and the differential case are made of 7075 aluminum.

Compared with the prior art, the utility model has the following beneficial effects:

1. a transfer case is arranged on a front axle housing, power is divided into two parts, one part of the power is output to front wheels, the other part of the power is output to rear wheels, and a set of power is used for driving four wheels to rotate;

2. the rear axle differential adopts a limited slip differential, when one side of a rear wheel slips on a muddy track, the differential is locked, the differential function of the differential is stopped, power is transmitted to the wheel on the non-slipping side as far as possible, and slipping caused by resistance unbalance is effectively avoided;

3. the speed reducer and the limited slip differential are integrated into a whole, the cross-country performance of the whole automobile is improved, the racing automobile is more suitable for cross-country working conditions, and meanwhile, the speed reducer and the limited slip differential have the advantages of being simple in structure, small in occupied space, strong in operability, strong in economy, convenient and fast to install and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a four-wheel drive transmission system for racing vehicles incorporating an engine and CVT gearbox;

FIG. 2 is a schematic diagram of a four-wheel drive transmission system for racing vehicles without an engine and CVT gearbox;

FIG. 3 is a front view of a rear axle drive incorporating a rear axle differential and a transfer case;

FIG. 4 is a cross-sectional view of the rear axle drive incorporating the rear axle differential and transfer case at A-A in FIG. 3;

FIG. 5 is a front cross-sectional view of the front axle drive;

FIG. 6 is a schematic perspective view of a limited slip differential;

FIG. 7 is a front view of a limited slip differential;

FIG. 8 is a cross-sectional view of a top view of the limited slip differential at B-B;

in the above figures:

1, a rear axle housing; 2, a transfer case; 3, driving a shaft; 4 a first input shaft; 5 a first output shaft; 6, a rear wheel half shaft ball cage; 7, a front axle housing; 8 a second input shaft; 9 a front axle differential; 10 front wheel half axle ball cage; 11 an engine; 12CVT reduction box; 13 a first gear; 14 intermediate shafts; 15 a second gear; 16 a first bevel gear; 17 a second bevel gear; 18 a third gear; 19 a differential case; 20 a differential ring gear; 21 a third bevel gear; 22 a cross-shaft; 23 a planetary gear; 24 left thrust pressure plate; 25 right thrust pressure plate; 26 half-shaft friction plates; 27 differential case friction plates; 28 compression spring; 29 left cutting corner; 30 right cutting angles; the block is driven 31.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The utility model can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the utility model. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Referring to fig. 1 and 2, a four-wheel drive transmission system for racing vehicles includes a rear drive axle device, a front drive axle device, and a transmission shaft 3 connecting the rear drive axle device and the front drive axle device; the rear drive axle device comprises a rear axle housing 1, a power assembly and a transfer case 2 are fixedly connected outside the rear axle housing 1, and a rear axle differential and a first input shaft 4 extending out of the rear axle housing 1 are arranged in the rear axle housing 1; a first output shaft 5 extending out of the transfer case 2 is arranged in the transfer case 2; an output shaft of the power assembly is connected with a first input shaft 4, and the rear axle differential is provided with two rear wheel half-shaft ball cages 6 which are distributed left and right and used for driving rear wheels to rotate;

referring to fig. 5, the front drive axle device includes a front axle housing 7, a second input shaft 8 extending out of the front axle housing 7 is disposed in the front axle housing 7, a front axle reducer and a front axle differential 9 are disposed in the front axle housing 7, and the front axle differential 9 has two front wheel half-axle ball cages 10 distributed left and right for driving front wheels to rotate;

the tail end of the transmission shaft 3 is connected with the first output shaft 5, and the head end of the transmission shaft 3 is connected with the second input shaft 8.

Specifically, referring to fig. 1, the power assembly includes an engine 11 and a CVT reduction box 12, an output shaft of the engine 11 is connected to an input shaft of the CVT reduction box 12, and an output shaft of the CVT reduction box 12 is connected to the first input shaft 4.

Referring to fig. 3 and 4, a first gear 13 is disposed on the first input shaft 4 in the rear axle housing 1, an intermediate shaft 14 is disposed in the rear axle housing 1, and one end of the intermediate shaft 14 penetrates through the rear axle housing 1 and extends into the transfer case 2; the intermediate shaft 14 is provided with a second gear 15 meshed with the first gear 13; the end part of the intermediate shaft 14 positioned in the transfer case 2 is provided with a first bevel gear 16, and one end of the first output shaft 5 positioned in the transfer case 2 is connected with a second bevel gear 17 meshed with the first bevel gear 16.

In the above embodiment, the power output from the engine 11 is firstly reduced and torque-increased by the CVT reduction box 12 and then output to the first input shaft 4, the first input shaft 4 is transmitted to the intermediate shaft 14, and due to the transfer gear, the intermediate shaft 14 outputs the power to the first output shaft 5 on the one hand, and the first output shaft 5 transmits the power to the front axle differential 9 to drive the front wheels, and on the other hand, the intermediate shaft 14 outputs the power to the rear axle differential to drive the rear wheels, and finally, a four-wheel drive transmission system with power for both the front wheels and the rear wheels is realized.

Further, a third gear 18 is arranged on the intermediate shaft 14 in the rear axle housing 1; the rear axle differential is a limited slip differential, referring to fig. 6, 7 and 8, the limited slip differential comprises a differential case 19, the outer wall of the differential case 19 is connected with a differential gear ring 20 engaged with a third gear 18, the end parts of the two rear wheel half axle ball cages 6 extending into the differential case 19 are provided with third bevel gears 21, four planetary gears 23 connected through a cross shaft 22 are arranged in the differential case 19, and the four planetary gears 23 are simultaneously engaged with the third bevel gears 21 on the two rear wheel half axle ball cages 6; a left thrust pressure plate 24 and a right thrust pressure plate 25 are arranged in the differential case 19, and the left thrust pressure plate 24 and the right thrust pressure plate 25 can axially move;

a plurality of parallel half axle friction plates 26 are respectively arranged on the rear wheel half axle ball cages 6 on the left side and the right side, and a differential case friction plate 27 inserted between two adjacent half axle friction plates 26 is arranged in the differential case 19; a plurality of compression springs 28 are arranged between the left thrust pressure plate 24 and the right thrust pressure plate 25, four pairs of left chamfer 29 and right chamfer 30 are symmetrically arranged on the opposite surfaces of the left thrust pressure plate 24 and the right thrust pressure plate 25, each pair of left chamfer 29 and right chamfer 30 forms a quadrangle, each end part of the cross shaft 22 is provided with a driving block 31, and each driving block 31 is correspondingly positioned in one quadrangle;

each left corner cut 29 comprises two corner cut faces and each right corner cut 30 comprises two corner cut faces, each pair of left corner cut 29 and right corner cut 30 forms a quadrilateral, the left included angle of the quadrilateral is equal to the right included angle, and the front included angle is smaller than the rear included angle.

In the above embodiments, the rear axle differential is specifically an embodiment of a limited slip differential. The limited slip differential well solves the technical problems that when one side of a driving wheel slips, power cannot be effectively transmitted, and the non-slipping wheel cannot obtain enough torque.

The limited slip differential operates on the following principle: the power is transmitted to the differential case 19 after being meshed and transmitted through the gears, the differential case 19 transmits the power to the left thrust pressure plate 24 and the right thrust pressure plate 25 through the internal splines, then transmits the power to the cross shaft 22, and then transmits the power to the rear wheel half axle ball cage 6 through the cross shaft 22.

When the limited slip rotating speed is not exceeded, the limited slip differential mechanism and the open differential mechanism have no great difference, and only the differential function is carried out. In this case, the friction plates of the limited slip differential are only acted by the compression springs 28, and the friction force between the axle side friction plate 26 and the differential case friction plate 27 is small, so that the relative rotation between the axle side friction plate 26 and the differential case friction plate 27 is not influenced, and the rear wheel axle ball cage 6 can normally rotate. However, when the limited slip differential enters a limited slip state, namely friction plate friction locking, the third bevel gear 21 on the rear wheel half shaft ball cage 6 on the slipping side presses the thrust pressure plate on the side along the back cone direction because the rear wheel half shaft ball cage 6 on the slipping side rotates at a high speed at this time and receives a large axial force. Under the combined action of the compression spring 28 and the pressure of the third bevel gear 21 on the side, the axle plate 26 and the differential case plate 27 connected to the rear-wheel-side cage 6 on the side are pressed against each other, generating a large frictional force whose torque direction is opposite to the rotational direction of the rear-wheel-side cage 6 on the side. When the friction force is increased to a certain degree, the side rear wheel half shaft ball cage 6 cannot rotate due to the friction force, so that the effect of friction and sliding limitation is achieved.

Further, the left front end and the right front end of the driving block 31 are respectively provided with a chamfer inclined plane matched with the quadrilateral front included angle.

Further, the front axle differential 9 is an open differential. The first gear 13 and the second gear 15 have a gear ratio of 3.529; the transmission ratio of the first bevel gear 16 and the second bevel gear 17 is 1.

In the above embodiment, after the power is decelerated by the first gear 13 and the second gear 15, the torque is increased, and the torque is output to the rear differential and the front differential 9 through the intermediate shaft 14. The front axle differential 9 and the rear axle differential have reduction ratios respectively, and if the front axle differential 9 and the rear axle differential with equal reduction ratios are selected, four wheels can be driven simultaneously; if the self speed reduction ratio of the front axle differential 9 is smaller than the self speed reduction ratio of the rear axle differential, the front wheels provide power when the vehicle runs in a normal straight line, the rear wheels roll freely, and the rear wheels start to provide power when the front wheels slip.

Further, the rear axle housing 1, the front axle housing 7 and the differential case 19 are made of 7075 aluminum with high strength and light weight, and preferably, 7075 aluminum is anodized.

Compared with the prior art, the utility model has the following beneficial effects:

1. the transfer case is arranged on the front axle housing, the power is divided into two parts, one part is output to the front wheels, the other part is output to the rear wheels, and a set of power-driven four-wheel rotation is realized;

2. the rear axle differential adopts a limited slip differential, when one side of a rear wheel slips on a muddy track, the differential is locked, the differential function of the differential is stopped, power is transmitted to the wheel on the non-slipping side as far as possible, and slipping caused by resistance unbalance is effectively avoided;

3. the speed reducer and the limited slip differential are integrated into a whole, the structure is simple and compact, the size is small, and the light weight of the racing car can be realized.

Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of this invention as claimed.

Claims (8)

1. A four-wheel drive transmission system for racing cars is characterized by comprising a rear drive axle device, a front drive axle device and a transmission shaft (3) for connecting the rear drive axle device and the front drive axle device; the rear drive axle device comprises a rear axle housing (1), a power assembly and a transfer case (2) are fixedly connected outside the rear axle housing (1), and a rear axle differential and a first input shaft (4) extending out of the rear axle housing (1) are arranged in the rear axle housing (1); a first output shaft (5) extending out of the transfer case (2) is arranged in the transfer case (2); an output shaft of the power assembly is connected with a first input shaft (4), and the rear axle differential is provided with two rear wheel half-shaft ball cages (6) which are distributed left and right and used for driving rear wheels to rotate;

the front drive axle device comprises a front axle housing (7), a second input shaft (8) extending out of the front axle housing (7) is arranged in the front axle housing (7), a front axle differential (9) is arranged in the front axle housing (7), and the front axle differential (9) is provided with two front wheel half-shaft ball cages (10) which are distributed left and right and used for driving front wheels to rotate;

the tail end of the transmission shaft (3) is connected with the first output shaft (5), and the head end of the transmission shaft (3) is connected with the second input shaft (8).

2. Four-wheel drive transmission system for racing vehicles according to claim 1, characterized in that the power assembly comprises an engine (11) and a CVT reduction box (12), the output shaft of the engine (11) being connected to the input shaft of the CVT reduction box (12), the output shaft of the CVT reduction box (12) being connected to the first input shaft (4).

3. The four-wheel drive transmission system for racing vehicles according to claim 1, wherein a first gear (13) is arranged on the first input shaft (4) in the rear axle housing (1), an intermediate shaft (14) is arranged in the rear axle housing (1), and one end of the intermediate shaft (14) penetrates out of the rear axle housing (1) and extends into the transfer case (2); a second gear (15) meshed with the first gear (13) is arranged on the intermediate shaft (14); a first bevel gear (16) is arranged at the end part of a middle shaft (14) positioned in the transfer case (2), and a second bevel gear (17) meshed with the first bevel gear (16) is connected to one end, positioned in the transfer case (2), of the first output shaft (5).

4. A four-wheel drive transmission system for racing vehicles according to claim 3, characterized in that a third gear (18) is also provided on the intermediate shaft (14) located in the rear axle housing (1);

the rear axle differential is a limited slip differential, the limited slip differential comprises a differential shell (19), a differential gear ring (20) meshed with a third gear (18) is connected to the outer wall of the differential shell (19), third bevel gears (21) are arranged at the end parts of two rear wheel half-axle ball cages (6) extending into the differential shell (19), four planetary gears (23) connected through cross shafts (22) are arranged in the differential shell (19), and the four planetary gears (23) are simultaneously meshed with the third bevel gears (21) on the two rear wheel half-axle ball cages (6); a left thrust pressure plate (24) and a right thrust pressure plate (25) are arranged in the differential case (19), and the left thrust pressure plate (24) and the right thrust pressure plate (25) can axially move;

a plurality of parallel half axle friction plates (26) are respectively arranged on the rear wheel half axle ball cages (6) on the left side and the right side, and a differential case friction plate (27) which is inserted between two adjacent half axle friction plates (26) is arranged in the differential case (19); a plurality of compression springs (28) are arranged between the left thrust pressure plate (24) and the right thrust pressure plate (25), four pairs of left cutting angles (29) and right cutting angles (30) are symmetrically arranged on the opposite surfaces of the left thrust pressure plate (24) and the right thrust pressure plate (25), each pair of left cutting angles (29) and right cutting angles (30) enclose a quadrangle, a driving block (31) is arranged at each end part of the cross shaft (22), and each driving block (31) is correspondingly positioned in one quadrangle;

each left corner cut (29) comprises two corner cut surfaces, each right corner cut (30) comprises two corner cut surfaces, each pair of left corner cut (29) and right corner cut (30) forms a quadrangle, the left included angle of the quadrangle is equal to the right included angle, and the front included angle is smaller than the rear included angle.

5. Four-wheel drive transmission system for racing vehicles according to claim 4, characterized in that the left and right front ends of the driving block (31) are respectively provided with a chamfer bevel matching the front included angle of the quadrilateral.

6. Four-wheel drive train for racing vehicles according to claim 1, characterized in that the front axle differential (9) is an open differential.

7. Four-wheel drive transmission system for racing vehicles according to claim 1, characterized in that the first gear (13) and the second gear (15) have a transmission ratio of 3.529; the transmission ratio of the first bevel gear (16) and the second bevel gear (17) is 1.

8. Four-wheel drive transmission system for racing cars according to claim 1, characterized in that the rear axle housing (1), the front axle housing (7) and the differential housing (19) are made of 7075 aluminum.

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