Four-wheel drive electric formula car wheel side system

Abstract

The utility model discloses a wheel side system of a four-wheel drive electric formula racing car. The wheel side system comprises a rim; the hub is arranged in the rim and is fixedly connected with the rim through a bolt; the planetary gear mechanism is arranged in the hub; the planetary gear mechanism comprises a sun gear, a planet gear, a planet carrier and a gear ring; wherein splines are arranged on the outer ring of the gear ring and the inner wall of the hub respectively, and the gear ring and the hub are connected through the splines; an output shaft of the AMK motor is coaxially and fixedly connected with one end of the sun gear; the ventilation valve is fixedly mounted on the hub and is communicated with an inner cavity of the hub; the stand column is fixedly connected with the planet carrier; the switching disc is arranged between the AMK motor and the stand column; wherein the AMK motor is connected with the stand column through the adapter plate; the brake disc is arranged on the outer side of the hub in a sleeving mode and connected with the hub through a bolt.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric formula racing cars for college students, and particularly relates to a wheel side system of a four-wheel drive electric formula racing car. Background Art

[0002] In order to cultivate a new generation of Chinese automotive talents in line with the trend of the times, the China Society of Automotive Engineers has organized the China Student Electric Formula Car Competition (FSEC) since 2015, requiring the participating teams to design and manufacture pure electric racing cars with excellent performance in acceleration, handling, stability and durability. Among them, the reasonable design of the power system can ensure that the racing car has good power and energy economy, which is the guarantee for achieving excellent dynamic results. In recent years, many teams have chosen to use AMK hub motors, combined with self-made hub reducers to achieve four-wheel independent drive, and have successively achieved excellent results in the field.

[0003] Since there are no finished reducers available on the market, the existing technical solution is mainly to use a homemade reducer to match the AMK wheel hub motor. Currently, most of the parts of the homemade reducer are integrated and assembled on the column and need to be assembled inside the column and form a sealed space with it, which makes the assembly process complicated and difficult.

[0004] The wheel hub reducers of most racing teams are only suitable for their own racing cars and cannot be commercially manufactured and sold.

[0005] In addition, when a racing car is subjected to endurance testing, the wheel hub reducer usually works at high intensity for a long time, causing its internal temperature to rise, and the air pressure to rise accordingly, thus causing oil leakage at the oil seal. In addition, the wheel hub reducer is oil lubricated, which also makes it difficult to seal itself and prone to oil leakage. Utility Model Content

[0006] The utility model aims to provide a wheel rim system for a four-wheel drive electric formula racing car, which has a wide range of applications and can reduce the probability of oil leakage of a reducer.

[0007] The technical solution provided by the utility model is:

[0008] A wheel side system for a four-wheel drive electric formula racing car, comprising:

[0009] Rim;

[0010] A wheel hub, which is arranged inside the wheel rim and fixedly connected to the wheel rim by bolts;

[0011] A planetary gear mechanism is arranged in the wheel hub; the planetary gear mechanism comprises: a sun gear, a planetary gear, a planet carrier and a ring gear;

[0012] Wherein, the outer ring of the gear ring and the inner wall of the wheel hub are respectively provided with splines, and the gear ring and the wheel hub are connected through the splines;

[0013] An AMK motor, whose output shaft is coaxially fixedly connected to one end of the sun gear;

[0014] A breathable valve, which is fixedly mounted on the wheel hub and communicated with the internal cavity of the wheel hub;

[0015] A column fixedly connected to the planet carrier;

[0016] An adapter plate, which is arranged between the AMK motor and the column;

[0017] Wherein, the AMK motor is connected to the column via the adapter plate;

[0018] The brake disc is sleeved on the outer side of the wheel hub and connected with the wheel hub by bolts.

[0019] Preferably, a threaded through hole is radially provided on the hub, and the air-permeable valve is connected to the threaded through hole via threads.

[0020] Preferably, the wheel hub comprises: a main wheel hub and a separate wheel hub, wherein the separate wheel hub is detachably connected to the main wheel hub;

[0021] Wherein, the ring gear is arranged in the main hub, and the separation hub is arranged close to the other end of the sun gear shaft.

[0022] Preferably, the main hub is connected to the separate hub by bolts.

[0023] Preferably, the main hub and the separation hub are sealed by a sealing ring.

[0024] Preferably, the sun gear is connected to the output shaft of the AMK motor via a spline.

[0025] Preferably, the breathable valve is mounted on the main hub and is arranged near the connection between the main hub and the separation hub.

[0026] Preferably, the planet carrier is arranged in the main wheel hub, and one end of the planet carrier close to the AMK motor is rotatably supported on the inner wall of the main wheel hub through a bearing.

[0027] Preferably, the four-wheel drive electric formula racing wheel system is characterized by further comprising:

[0028] A planet carrier cover, which is disposed in the separation hub and connected to the planet carrier by bolts;

[0029] Wherein, the outer ring of the planet carrier cover is rotatably supported on the inner wall of the separation hub through a bearing.

[0030] Preferably, a sealing cover is connected to one end of the separation hub away from the main hub;

[0031] The sealing cover blocks the port of the separation hub, and the separation hub and the sealing cover are sealed by a sealing ring.

[0032] The beneficial effects of the utility model are:

[0033] The four-wheel drive electric formula racing car wheel rim system provided by the utility model has a simple assembly process, a wide range of applications, and can reduce the probability of oil leakage of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional view of the wheel side system of the four-wheel drive electric formula racing car described in the present invention.

[0035] Figure 2 The utility model is an exploded view of the wheel side system of the four-wheel drive electric formula racing car.

[0036] Figure 3 It is a structural schematic diagram of the adapter plate described in the utility model. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0038] like Figure 1-3As shown, the utility model provides a wheel rim system of a four-wheel drive electric formula racing car, including: a sealing cover 1, a rim 2, a sealing cover and a separation hub connecting bolt 3, a sealing cover and a separation hub connecting anti-loosening nut 4, an O-ring 5 at the connection between the sealing cover and the separation hub, a wheel hub and a separation hub connecting bolt 6, a separation hub 7, a planetary carrier cover 8, a sun gear 9, a lower needle roller bearing and a planetary carrier cover connecting thrust bearing 10, a gear shaft 11, a planetary gear 12, an upper needle roller bearing and a planetary carrier connecting thrust bearing 13, a lower (right) needle roller bearing 14, a planetary carrier 15, an outer hexagonal bolt 16 connecting the wheel hub and the rim, an anti-loosening nut 17 connecting the wheel hub and the rim, a washer 18 connecting the wheel hub and the rim, a main wheel hub 19, a brake disc 20, a column 21, and an AMK motor 2 2. Adapter plate 23, bolts connecting brake disc and wheel hub 24, anti-loosening nut 25 connecting brake disc and wheel hub, bolts connecting planetary carrier 26, bearings connecting sun gear and planetary carrier cover 27, bearings connecting sun gear and planetary carrier 28, bearings fixing planetary carrier cover and separation hub 29, bearings fixing hub and planetary carrier 30, bolts connecting adapter plate and column 31, nuts connecting adapter plate and column 32, bolts connecting motor and adapter plate 33, upper (left) needle roller bearing 34, retaining spring 35 fixing sun gear lower (right) and bearing, O-ring 36 at the connection between hub and separation hub, oil seal 37 sealing sun gear and planetary carrier 38, retaining spring 39, breather valve 40, bolts fixing planetary carrier cover and planetary carrier 41, gear ring 42.

[0039] Due to the special position of the mounting hole of the AMK motor, the AMK motor 22 cannot be directly connected to the column. The design of the adapter plate solves this problem. During assembly, the motor can be first connected to the adapter plate 23, and then the adapter plate 23 is connected to the column.

[0040] The adapter plate 23 is an annular disk, and a plurality of bosses 23a are provided on one side of the adapter plate 23, and the positions of the bosses correspond one to one with the positions of the mounting holes of the AMK motor 22. The adapter plate 23 is connected to the AMK motor 22 through a plurality of motor-to-adapter plate connecting bolts 33, and the model of the motor-to-adapter plate connecting bolts 33 is M3*12.

[0041] The adapter plate 23 is connected to the column 21 through 6 adapter plate and column connection bolts 31, and 6 adapter plate and column connection nuts 32 are used to prevent the bolts from loosening. Among them, the model of the adapter plate and column connection bolts 31 is M5*20, and the model of the adapter plate and column connection nuts 32 is M5.

[0042] The column 21 and the planet carrier 15 are connected by six planet carrier-column connecting bolts 26. The column 21 and the planet carrier 15 can also be set as an integrated structure.

[0043] One end of the sun gear 9 is designed with a spline to cooperate with the output end of the AMK motor 22 to achieve a fixed connection. This design eliminates the coupling structure between the sun gear and the output end of the AMK motor, which saves materials during processing, reduces processing costs, and improves the economy of parts; and bearings are designed at both ends for fixed support to improve its stability during high-speed rotation.

[0044] The inner and outer rings of the sun gear and planet carrier connecting bearing 28 are respectively interference fit between the bearing installation position at one end of the sun gear 9 and the bearing installation groove in the middle of the planet carrier 15; wherein, the model of the sun gear and planet carrier connecting bearing 28 is W61704. At the same time, an oil seal 38 for sealing the sun gear and the planet carrier is designed on the inner wall of the bearing installation groove of the planet carrier 15 to further ensure the sealing between the sun gear 9 and the planet carrier 15.

[0045] The inner and outer rings of the sun gear and planet carrier cover connecting bearing 27 are respectively interference fit between the bearing mounting position at the other end of the sun gear 9 and the bearing mounting groove of the planet carrier cover 8. The sun gear lower (right) and the bearing fixing spring 35 are used to prevent the bearing from moving; wherein, the sun gear and planet carrier cover connecting bearing 27 is a deep groove ball bearing, model 61801.

[0046] The inner and outer rings of the hub and planet carrier fixed bearing 30 are respectively interference fit with the bearing mounting position of the planet carrier 15 and the bearing mounting groove of the main wheel hub 19, and a planet carrier and hub sealing oil seal 37 is designed on the inner wall of the bearing mounting groove of the main wheel hub 19 to further ensure the seal between the main wheel hub 19 and the planet carrier 15. The model of the hub and planet carrier fixed bearing 30 is 61816.

[0047] The gear ring 42 cooperates with the splines in the wheel hub 19 through the splines to achieve a fixed connection, and is prevented from loosening by the gear ring retaining spring 39.

[0048] Through the spline matching, the contact part between the hub and the ring gear has a good stress structure and uniform stress distribution, which indirectly increases the strength of both and can extend the service life of the parts.

[0049] The planet carrier 15 and the planet carrier cover 8 are connected through the planet carrier cover and the planet carrier fixing bolt 41. The model of the planet carrier fixing bolt 41 is M6*16.

[0050] The two ends of the gear shaft 11 of the three planetary gears 12 are respectively inserted into the planet carrier-15 and the planet carrier cover-8; the three upper needle bearings are connected to the planet carrier, and the thrust bearing 13 is fitted with the surface of one side of the planet carrier 15, and the three lower needle bearings are connected to the planet carrier cover, and the thrust bearing 10 is fitted with the left surface of the planet carrier cover 8. Among them, the upper needle bearing is connected to the planet carrier, and the thrust bearing 13 and the lower needle bearing is connected to the planet carrier cover. The thrust bearing 10 is 10*24*4.

[0051] The planetary gear 12 includes a large planetary gear and a small planetary gear arranged coaxially; the upper (left) needle roller bearing 34 is respectively interference fit with the small planetary gear bearing mounting hole and the gear shaft, and the left side of the bearing is fitted with the three upper needle roller bearings and the planetary carrier connected thrust bearing 13, and the lower (right) needle roller bearing 14 is respectively interference fit with the large planetary gear bearing mounting hole and the gear shaft, and the right side of the bearing is fitted with the three lower needle roller bearings and the planetary carrier cover connected thrust bearing 10. Among them, the upper (left) needle roller bearing 34 and the lower (right) needle roller bearing 14 are both 10*14*10.

[0052] The inner and outer rings of the planet carrier cover and the separation hub fixed bearing 29 are respectively interference fit with the bearing mounting position of the planet carrier cover 8 and the bearing mounting position of the separation hub 7. Among them, the model of the planet carrier cover and the separation hub fixed bearing is 61816.

[0053] The main hub 19 and the separation hub 7 are connected by 6 hub-separation hub connecting bolts 6. At the same time, a mounting groove for an O-ring 36 at the connection between the hub and the separation hub is designed at the end of the main hub 19 to ensure the sealing of the main hub 19 and the separation hub 7. Among them, the model of the hub-separation hub connecting bolt is M6*16.

[0054] The main hub 19 and the separation hub 7 may also be fixed by interference fit.

[0055] The wheel hub is provided with two parts, namely, the main wheel hub 19 and the separation wheel hub 7; the bearings matched with the planet carrier 15 and the planet carrier cover 8 are respectively installed on the main wheel hub 19 and the separation wheel hub 7. In this way, it is not necessary to consider the installation order of the bearings on the planetary gear and the separation wheel hub during assembly, so that the assembly process is simple. Otherwise, the planetary gear should be put in before the planetary carrier cover and the separation wheel hub fixed bearing 29 are installed, and cannot be disassembled at will.

[0056] The breathable valve 40 is mounted on the main hub 19 and is arranged near the connection between the main hub 19 and the separation hub 7. A threaded through hole (breathable valve mounting hole) is provided on the main hub 19, and the breathable valve 40 is threadedly connected to the main hub 19. As a preferred embodiment, the breathable valve 40 is a breathable valve with a built-in breathable film, and the thread specification is M8*1.25.

[0057] The heat generated by the high-speed operation of the reducer causes a pressure difference between the reducer and the outside, which affects the sealing effect of the reducer. The breathable valve 40 can be set to discharge gas and balance the air pressure, and in the later maintenance of the reducer, the lubricating oil of the reducer can be replaced through the breathable valve installation hole.

[0058] The separation hub 7 and the sealing cover 1 are connected by 6 sealing cover and separation hub connection bolts 3, and 6 sealing cover and separation hub connection anti-loosening nuts 4 are used to prevent the bolts from loosening. Among them, the model of the sealing cover and separation hub connection bolts is M3*12, and the model of the sealing cover and separation hub connection anti-loosening nuts 4 is M3.

[0059] The main hub 19 is connected to the rim 2 by the hub-rim connecting hexagonal bolts (M6) 16, and the hub-rim connecting anti-loosening nuts (M6) 17 are used to prevent the bolts from loosening, and the hub-rim connecting washers (M6) 18 are padded to prevent wear.

[0060] The utility model simplifies the connection method by directly connecting the wheel hub and the rim, so that the power output by the motor directly acts on the tire after being decelerated and torque-increased by the reducer, eliminating the need for complex transmission devices, greatly reducing the weight of the transmission system, and reducing power loss.

[0061] The brake disc 20 and the main wheel hub 19 are connected by the brake disc and wheel hub connecting bolts 24, and the brake disc and wheel hub connecting anti-loosening nuts 25 are used to prevent the bolts from loosening. Among them, the model of the brake disc and wheel hub connecting bolts is M5*12, and the model of the brake disc and wheel hub connecting anti-loosening nuts is M5. The bolt connection replaces the traditional disc-pin type connection method, which reduces the outer diameter of the brake disc and is suitable for the 10-inch rim of the Formula Student car.

[0062] The working principle of the wheel hub reducer in the wheel side system of the four-wheel drive electric formula racing car provided by the utility model is as follows: the output end of the AMK motor is connected to the sun gear, and at the same time, the output end of the motor outputs torque to drive the sun gear to rotate, and the meshing action of the sun gear and the large planetary gear will cause the large planetary gear and the small planetary gear to produce self-rotation. At the same time, because the small planetary gear and the gear ring installed on the inner wall of the hub are meshed with each other, the planetary gear will eventually drive the gear ring to rotate in the same direction as the sun gear under the action of the self-rotation driving force, and the gear ring drives the hub to rotate. The power output by the motor, after passing through the reducer, has a reduced speed and increased torque, and is finally output through the hub.

[0063] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A four-wheel drive electric formula racing wheel system, characterized in that: include: Rim; A wheel hub, which is arranged inside the wheel rim and fixedly connected to the wheel rim by bolts; A planetary gear mechanism is arranged in the wheel hub; the planetary gear mechanism comprises: a sun gear, a planetary gear, a planet carrier and a ring gear; Wherein, the outer ring of the gear ring and the inner wall of the wheel hub are respectively provided with splines, and the gear ring and the wheel hub are connected through the splines; An AMK motor, whose output shaft is coaxially fixedly connected to one end of the sun gear; A breathable valve, which is fixedly mounted on the wheel hub and communicated with the internal cavity of the wheel hub; A column fixedly connected to the planet carrier; An adapter plate, which is arranged between the AMK motor and the column; Wherein, the AMK motor is connected to the column via the adapter plate; The brake disc is sleeved on the outer side of the wheel hub and connected with the wheel hub by bolts.

2. The four-wheel drive electric formula racing wheel system according to claim 1, characterized in that: A threaded through hole is radially provided on the wheel hub, and the air-permeable valve is connected to the threaded through hole via threads.

3. The four-wheel drive electric formula racing wheel system according to claim 2, characterized in that: The wheel hub comprises: a main wheel hub and a separate wheel hub, wherein the separate wheel hub is detachably connected to the main wheel hub; Wherein, the ring gear is arranged in the main hub, and the separation hub is arranged close to the other end of the sun gear shaft.

4. The four-wheel drive electric formula racing wheel system according to claim 3, characterized in that: The main wheel hub is connected to the separate wheel hub by bolts.

5. The four-wheel drive electric formula racing wheel system according to claim 3 or 4, characterized in that: The main hub and the separation hub are sealed by a sealing ring.

6. The four-wheel drive electric formula racing wheel system according to claim 5, characterized in that: The sun gear is connected to the output shaft of the AMK motor via a spline.

7. The four-wheel drive electric formula racing wheel system according to claim 6, characterized in that: The breathable valve is mounted on the main hub and is arranged close to the connection between the main hub and the separation hub.

8. The four-wheel drive electric formula racing wheel system according to claim 7, characterized in that: The planet carrier is arranged in the main wheel hub, and one end of the planet carrier close to the AMK motor is rotatably supported on the inner wall of the main wheel hub through a bearing.

9. The four-wheel drive electric formula racing wheel system according to claim 8, characterized in that: Also includes: A planet carrier cover, which is disposed in the separation hub and connected to the planet carrier by bolts; Wherein, the outer ring of the planet carrier cover is rotatably supported on the inner wall of the separation hub through a bearing.

10. The four-wheel drive electric formula racing wheel system according to claim 9, characterized in that: One end of the separation hub away from the main hub is connected to a sealing cover; The sealing cover blocks the port of the separation hub, and the separation hub and the sealing cover are sealed by a sealing ring.

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