Cross-country tension racing vehicle

Abstract

The invention relates to the technical field of racing cars, in particular to a cross-country tension racing car which comprises a car frame and a transmission system installed on the car frame, and wheels are installed on the car frame through a suspension system. The transmission system comprises a gearbox mounted at the rear part of the frame and a differential mechanism mounted at the front part of the frame; the gearbox and the differential mechanism are in transmission connection through first transmission shafts arranged front and back. The suspension system comprises front cavel bodies located on the inner sides of the two wheels on the front portion respectively, and the two front cavel bodies are fixed to the front side portion of the frame through an upper double-fork-arm suspension and a lower double-fork-arm suspension. The cross-country tension racing vehicle has the advantages that the whole vehicle is lighter, compact in structure, good in operability, excellent in trafficability, high in safety and the like, the lighter vehicle has enough power performance, and the vehicle is small in friction resistance in the advancing process, good in trafficability to uneven roads, not prone to turning over and beneficial to improving the racing result.

Description

Technical Field

[0001] The invention relates to the technical field of racing cars, and in particular to an off-road rally racing car. Background Art

[0002] The BAJA event originated in the United States and is the predecessor of the Formula Student car competition. The Baja Competition (BSC) of the China Society of Automotive Engineering requires each participating team to participate in a variety of static and dynamic tests. The dynamic projects include traction tests, climbing tests, straight-line acceleration tests, endurance tests, etc. The event has strict requirements on the power, handling stability and braking performance of the car, and also requires the car to have good endurance. Therefore, the car needs to have high strength, light weight and good dynamic response to complete the various contents of the competition.

[0003] Most of the traditional racing cars in China have truss-type structural frames. Although this type of frame can meet the requirements of reliability, it has the disadvantage of being heavy. Other components of traditional racing cars are also mostly made of steel materials, with a solid structure and also heavy weight. Therefore, it is necessary to optimize the components of the car from the aspects of materials and structure, reduce the weight of the car and improve the power of the car.

[0004] The traditional brake structure consists of four brake discs distributed at each wheel, which are composed of a brake oil pump, a brake disc connected to the wheel, and a brake caliper on the disc. When braking, the high-pressure oil pushes the piston, pressing the brake shoe against the brake disc to produce a braking effect. For a small BAJA racing car, the brake disc occupies a large mass ratio. Although the brake disc can provide sufficient braking force, its large mass has an adverse effect on the car's dynamic performance.

[0005] In the prior art, the turning angle of the front horn of a racing car is limited and not large enough, the steering ratio is small and inflexible, resulting in a large turning radius, low control sensitivity, poor passability, and prone to safety accidents.

[0006] Domestic single-seat small-displacement racing cars are mostly two-wheel drive structures, while large-displacement off-road racing cars use four-wheel drive. In addition, due to cost issues, the structural layout of the vehicle's power and transmission system generally has defects such as unreasonable structural layout, insufficient compactness, and poor consideration of safety protection design. As a result, the vehicle is large in size, has many materials, heavy weight, poor acceleration performance, low off-road passing performance, and insufficient safety protection. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an off-road rally racing car in view of the above shortcomings, which has the advantages of lighter vehicle, compact structure, good operability, excellent passability, high safety, etc. The lighter vehicle has sufficient power performance, and the vehicle has small friction resistance during movement, good passability on uneven roads, is not easy to roll over, and is conducive to improving competition results.

[0008] To solve the above problems, the technical solution adopted by the present invention is as follows: An off-road rally car comprises a frame and a transmission system mounted on the frame, wherein the frame is mounted with wheels via a suspension system; the transmission system comprises a gearbox mounted at the rear of the frame and a differential mounted at the front of the frame; the gearbox and the differential are connected in transmission via first transmission shafts arranged at the front and rear; The gearbox comprises a housing and a drive shaft rotatably mounted on the housing; The driving shaft is provided with a second spline segment, and a floating central brake disc is installed on the second spline segment; the floating central brake disc is installed on the second spline segment in a floating manner through a spline flange.

[0009] As an improvement, the gearbox also includes a rear reversing shaft rotatably mounted on the housing; the rear reversing shaft is horizontally arranged along the front-to-back direction, the drive shaft is horizontally arranged along the left-to-right direction, and the axis of the drive shaft is perpendicular to the axis of the rear reversing shaft; a large bevel gear is fixedly mounted on the drive shaft, and a small bevel gear meshing with the large bevel gear is fixedly mounted on the rear reversing shaft; both ends of the first transmission shaft are respectively connected to the front reversing shaft and the rear reversing shaft through a first universal joint.

[0010] As an improvement, the transmission ratio of the small bevel gear to the large bevel gear is the same as the transmission ratio of the driving gear to the ring gear.

[0011] As an improvement, a spline flange is installed on the second spline segment, and a spline hole matching the size of the second spline segment is provided in the middle of the spline flange. The second spline segment passes through the spline hole, and the spline flange can move axially along the second spline segment; the floating central brake disc is fixed on the spline flange.

[0012] As an improvement, it also includes a central brake caliper compatible with the floating central brake disc, and the floating central brake disc is located in the gap between the two brake pads of the central brake caliper; when the floating central brake disc rotates with the drive shaft, the floating central brake disc is located between the two brake pads of the central brake caliper.

[0013] As an improvement, the differential comprises a housing fixed to the frame, a ring gear rotatably mounted on the housing, and a front reversing shaft rotatably mounted on the frame, the end of the front reversing shaft is provided with a driving gear meshing with the ring gear for transmission; the axis of the front reversing shaft is perpendicular to the axis of the ring gear, and both the ring gear and the driving gear are bevel gears; Two planetary gear carriers are arranged at intervals on the ring gear, and each planetary gear carrier is provided with a rotatable planetary gear, and the axis of the planetary gear is perpendicular to the axis of the ring gear; two rotatable half-axles are also provided on the frame, and half-axle gears are fixed on the half-axles; the half-axles are arranged on the inner side of the ring gear, and the axis of the half-axles coincides with the axis of the ring gear; the two planetary gears are meshed with the two half-axle gears for transmission; the half-axle gears and the planetary gears are both bevel gears.

[0014] As an improvement, the suspension system includes front cleats located at the inner sides of the two front wheels respectively, and the two front cleats are fixed to the front side of the frame through an upper double wishbone suspension and a lower double wishbone suspension; Both the upper double wishbone suspension and the lower double wishbone suspension are A-type structures; The tips of the upper double wishbone suspension and the lower double wishbone suspension are respectively hinged on the upper connecting part and the lower connecting part of the front horn; the two ends of the other end of the upper double wishbone suspension and the two ends of the other end of the lower double wishbone suspension are respectively hinged on the front part of the frame.

[0015] As an improvement, the ends of the tip of the upper double fork arm suspension and the ends of the tip of the lower double fork arm suspension are both provided with mounting holes, in which a bearing outer ring is fixedly provided, a spherical bearing inner ring is rotatably provided on the inner side of the bearing outer ring, a penetrating connecting hole is provided in the middle of the bearing inner ring, a clevis bolt is provided in the connecting hole, and the bolt head shape of the clevis bolt is a spherical surface that matches the shape of the bearing inner ring; the ends of the upper double fork arm suspension and the ends of the lower double fork arm suspension are respectively fixed to the upper connecting part and the lower connecting part of the front clevis by clevis bolts.

[0016] As an improvement, the suspension system further comprises a horizontally arranged front wheel axle and a front wheel core fixed at the end of the front wheel axle; the front wheel axle or the front wheel core is rotatably connected with the front horn shaft; a horizontally penetrating through hole is provided in the middle of the front horn shaft, the front wheel core is rotatably mounted in the through hole, and a bearing is provided between the front horn shaft and the front wheel core; The front wheel core is a flange structure, including a cylindrical body and a flange located at the end of the body, and the flange is provided with four evenly arranged mounting holes; the flange is fixedly connected to the wheel hub; a brake disc is fixed on the side of the flange away from the wheel hub; The body is rotatably mounted in the through hole of the front horn shaft; The middle part of the body of the front wheel core is provided with a through hole that penetrates left and right, the front wheel shaft penetrates the through hole, the front wheel shaft is provided with a first spline segment, the through hole is provided with a spline hole that matches the outer size of the first spline segment, and the first spline segment is installed in the spline hole; the front wheel core and the front wheel shaft are connected by the first spline segment and the spline hole to achieve circumferential fixation between the two; the end of the front wheel shaft is provided with a threaded section, and a nut is installed on the threaded section for axial fixation of the front wheel core on the front wheel shaft; The end of the front wheel axle near the inside of the off-road rally car extends to the outside of the front wheel core, and is provided with a second universal joint; the second universal joint is connected to the half-axle through the second transmission shaft; one end of the second transmission shaft is connected to the second universal joint ball, and the other end is connected to the half-axle ball. The front wheel brake caliper adapted to the brake disc is fixedly installed on the front horn.

[0017] The present invention adopts the above technical solution, and has the following advantages compared with the prior art: The off-road rally car of this technical solution has the advantages of lighter vehicle, compact structure, good operability, excellent passability, high safety, etc. The lighter vehicle has sufficient power performance, and the vehicle has small friction resistance during the movement, good passability on uneven roads, and is not easy to roll over, which is conducive to improving competition results.

[0018] The braking system of this off-road rally car adopts a mid-mounted rear axle disc brake structure. The floating central brake disc is matched with an opposed four-piston brake caliper. The gearbox is integrated with the drive shaft braking system of the off-road rally car, reducing the number of brakes. The structure is compact and non-redundant, and while meeting the braking performance requirements, it also better meets the requirements of the vehicle's lightweight design.

[0019] The off-road rally car adopts a floating central brake disc mechanism, which can reduce the assembly gap between the brake disc and the caliper brake pad, improve the braking sensitivity, and avoid the increase of the driving resistance of the off-road rally car due to the contact between the brake disc and the brake pad caused by the assembly and accessory size accuracy problems; this structural design makes the floating central brake disc and the central brake caliper structure more compact, reduces the processing accuracy and installation accuracy requirements of the floating central brake disc and the central brake caliper, reduces the installation difficulty, and facilitates the installation and debugging of the floating central brake disc and the central brake caliper.

[0020] The main reducer in the gearbox of this off-road rally car adopts a two-stage spur gear transmission. The third output shaft is equipped with a bevel gear to realize the front-wheel drive distribution. It is integrated with the rear axle brake system of the vehicle as a whole and supported on the frame. This makes the drive shaft brake system and the gearbox compact, small in size, relatively light in weight, highly firm and well protected, which better meets the requirements of lightweight and safety design of the vehicle.

[0021] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an off-road rally car of the present invention; Figure 2 It is a structural schematic diagram of an off-road rally car of the present invention; Figure 3 for Figure 2 A top view of Figure 4 for Figure 2 Bottom view of Figure 5 for Figure 2 Left view of; Figure 6 for Figure 2 Right view of; Figure 7 Schematic diagram of the transmission system Figure 1 ; Figure 8 Schematic diagram of the transmission system Figure 2 ; Fig. 9 for Figure 7 Schematic diagram of the structure of the center differential Figure 1 ; Fig.10 for Figure 7 Schematic diagram of the structure of the center differential Figure 2 ; Fig.11 for Figure 7 Schematic diagram of the gearbox structure Figure 1 ; Fig.12 for Figure 7 Schematic diagram of the gearbox structure Figure 2 ; Fig.13 for Fig.12 Side view of Fig.14 for Fig.13 AA section view in; Fig.15 Schematic diagram of the suspension system at the front wheel Figure 1 ; Fig.16 Schematic diagram of the suspension system at the front wheel Figure 2 ; Fig.17 Schematic diagram of the suspension system at the front wheel Figure 3 ; Fig.18 for Fig.17 BB section view in; Fig.19 It is a structural schematic diagram of the suspension system at the rear wheel; Fig. 20 for Fig.19 Middle CC section view; Among them: 1-frame, 2-transmission system, 3-suspension system, 4-wheel, 5-gearbox, 6-differential, 7-first transmission shaft, 8-first universal joint, 9-front reversing shaft, 10-rear reversing shaft, 11-large bevel gear, 12-small bevel gear, 13-housing, 14-ring gear, 15-front wheel core, 16-brake disc, 17-front horn, 18-front wheel axle, 19-wheel hub, 20-second transmission shaft, 21-front wheel brake caliper, 22-upper double wishbone suspension, 23-lower double wishbone suspension , 24-upper connection part, 25-lower connection part, 26-front connection part, 27-steering rod, 28-upper fixing part, 29-lower fixing part, 30-trapezoidal front, 31-cage roll cage, 32-support frame, 33-cockpit, 34-first spline section, 35-spline hole, 36-mounting hole, 37-bearing outer ring, 38-bearing inner ring, 39-shroud bolt, 40-second universal joint, 41-body, 42-flange, 43-mounting part, 44-front shroud shaft, 45-rear shroud, 46-rear wheel axle, 47-rear wheel core, 48-avoidance area, 49-third universal joint, 50-third transmission shaft, 51-semi-axle, 52-semi-axle gear, 53-planetary gear, 54-driving gear, 55-planetary gear carrier, 56-drive shaft, 57-housing, 58-seat bearing, 59-second spline section, 60-floating central brake disc, 61-spline flange, 62-central brake caliper, 63-upper tie rod, 64-lower tie rod, 65-fisheye ball head, 66-trailing arm, 67-input shaft, 68-intermediate shaft, 69-first spur gear, 70-second spur gear, 71-third spur gear, 72-fourth spur gear, 73-circlip for hole, 74-shroud bolt spacer, 75-shaft shoulder. DETAILED DESCRIPTION

[0023] For the purpose of explanation and not limitation, when using the term rally car, the direction to the left of the driver is defined as left, the direction to the right of the driver is defined as right; the direction in front of the driver is defined as front, the direction behind the driver is defined as rear, and the up and down are derived from this. The position close to the center of the rally car is defined as inside, and the opposite direction is defined as outside.

[0024] Example

[0025] like Figures 1 to 6 As shown together, an off-road rally car includes a frame 1 of a truss structure and a transmission system 2 installed on the frame 1, and the frame 1 is installed with four wheels 4 through a suspension system 3. The frame 1 is made of high-strength steel pipes to form a steel pipe truss structure frame, and a lightweight design of the frame 1 is achieved while ensuring strength.

[0026] The wheel 4 includes a wheel hub 19 and a tire mounted on the wheel hub 19. Preferably, the wheel hub 19 is a 10-inch off-road wheel hub with aluminum alloy flange; the tires of the front two wheels 4 are 22*7*10mm cross pattern tires, and the tires of the rear two wheels 4 are 22*7*10mm eight-shaped pattern tires.

[0027] like Figures 7 and 8 As shown together, the transmission system 2 includes a gearbox 5 installed at the rear of the frame 1 and a differential 6 installed at the front of the frame 1; the gearbox 5 and the differential 6 are connected to each other through a first transmission shaft 7 arranged front and rear.

[0028] like Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown together, the differential 6 includes a housing 13 fixed to the frame 1, a ring gear 14 rotatably mounted on the housing 13, and a front reversing shaft 9 rotatably mounted on the frame 1, and a driving gear 54 meshing with the ring gear 14 is provided at the end of the front reversing shaft 9. The axis of the front reversing shaft 9 is perpendicular to the axis of the ring gear 14, and the ring gear 14 and the driving gear 54 are both bevel gears.

[0029] The ring gear 14 is provided with two planetary gear carriers 55 arranged at intervals, and each planetary gear carrier 55 is provided with a planetary gear 53 arranged to rotate, and the axis of the planetary gear 53 is perpendicular to the axis of the ring gear 14. The two planetary gears 53 are arranged opposite to each other. The frame 1 is also provided with two half shafts 51 arranged to rotate, and the ends of the half shafts 51 are fixedly provided with half shaft gears 52. The half shafts 51 are arranged on the inner side of the ring gear 14, and the axis of the half shafts 51 coincides with the axis of the ring gear 14. Each planetary gear 53 is meshed with two half shaft gears 52 for transmission. The half shaft gears 52 and the planetary gears 53 are both bevel gears.

[0030] like Figure 7 , Figure 8 , Figures 11 to 14 As shown together, the gearbox 5 includes a housing 57 and a drive shaft 56 and a rear reversing shaft 10 rotatably mounted on the housing 57; the rear reversing shaft 10 is horizontally arranged along the front-rear direction of the off-road rally car, and the drive shaft 56 is horizontally arranged along the left-right direction, and the axis of the drive shaft 56 is perpendicular to the axis of the rear reversing shaft 10. A large bevel gear 11 is fixedly mounted on the drive shaft 56, and a small bevel gear 12 meshing with the large bevel gear 11 is fixedly mounted on the rear reversing shaft 10. The two ends of the first transmission shaft 7 are respectively connected to the front reversing shaft 9 and the rear reversing shaft 10 through the first universal joint 8. In this embodiment, preferably, the first universal joint 8 is a cross universal joint.

[0031] The transmission ratio of the small bevel gear 12 to the large bevel gear 11 is the same as the transmission ratio of the driving gear 54 to the ring gear 14. The large bevel gear 11 and the ring gear 14 have the same structure and parameters, and the small bevel gear 12 and the driving gear 54 have the same structure and parameters.

[0032] The above structural design enables the half shaft 51 and the drive shaft 56 to rotate at a low speed, and the first transmission shaft 7 to rotate at a high speed. When transmitting the same power, the first transmission shaft 7 is in a high speed and low torque state; that is, when transmitting the same power, the higher the speed of the first transmission shaft 7 and the lower the torque, the smaller the shaft diameter of the first transmission shaft 7 can be, which reduces the vehicle weight of the off-road rally car and increases the service life of the first transmission shaft 7. Preferably, a fixed seat bearing 58 is provided on the frame 1, and the first transmission shaft 7 passes through the seat bearing 58 and is rotatably set in the seat bearing 58. The seat bearing 58 forms an effective support for the middle part of the first transmission shaft 7, so that the first transmission shaft 7 rotates more smoothly.

[0033] Both ends of the drive shaft 56 extend to the outside of the housing 57. One end of the drive shaft 56 is provided with a second spline segment 59, and the second spline segment 59 is located outside the housing 57. A floating central brake disc 60 is mounted on the second spline segment 59. Specifically, a spline flange 61 is mounted on the second spline segment 59, and a spline hole matching the size of the second spline segment 59 is provided in the middle of the spline flange 61. The second spline segment 59 passes through the spline hole, and the spline flange 61 can move along the axial direction of the second spline segment 59. Rivet holes are provided on the spline flange 61 and the floating central brake disc 60, and the spline flange 61 and the floating central brake disc 60 are hot-riveted together by rivets. The floating central brake disc 60 is floatingly mounted on the second spline segment 59 through the spline flange 61.

[0034] A central brake caliper 62 adapted to the floating central brake disc 60 is provided at the position of the outer part of the box 57 corresponding to the floating central brake disc 60. The central brake caliper 62 is fixedly mounted on the box 57, or fixedly mounted on the frame 1, or fixedly mounted between the box 57 and the frame 1. In this embodiment, preferably, the central brake caliper 62 is an opposed four-piston brake caliper. The floating central brake disc 60 is located in the gap between the two brake pads of the central brake caliper 62. When the floating central brake disc 60 rotates with the drive shaft 56, it is located between the two brake pads of the central brake caliper 62. When the floating central brake disc 60 contacts one of the brake pads of the central brake caliper 62, the floating central brake disc 60 is subjected to the force of the brake pad and instantly moves axially along the second spline segment 59 until it is separated from the brake pad. This structural design can ensure that the floating central brake disc 60 will not rub against the brake pads when rotating, thereby reducing the resistance during the movement of the off-road rally car; and this structural design makes the floating central brake disc 60 and the central brake caliper 62 more compact, reduces the processing accuracy and installation accuracy requirements of the floating central brake disc 60 and the central brake caliper 62, reduces the installation difficulty, and facilitates the installation and debugging of the floating central brake disc 60 and the central brake caliper 62.

[0035] In the above structural design, the braking system adopts a mid-mounted rear axle disc brake structure, and the floating central brake disc 60 is matched with an opposed four-piston brake caliper. The gearbox 5 is integrated with the braking system of the drive shaft 56 of the off-road rally car, which reduces the number of brakes, has a compact structure and is non-redundant. Under the condition of meeting the braking performance, it better meets the requirements of the vehicle lightweight design.

[0036] like Figure 7 , Figure 8 , Figures 11 to 14 As shown together, the gearbox 5 is also provided with an input shaft 67 and an intermediate shaft 68 which are arranged in parallel with the drive shaft 56; the input shaft 67, the intermediate shaft 68 and the drive shaft 56 are arranged in a herringbone shape to reduce the external dimensions of the structure as much as possible. The input shaft 67 is connected to the power system in transmission. A first spur gear 69 is fixedly arranged on the input shaft 67, a second spur gear 70 and a third spur gear 71 are arranged on the intermediate shaft 68, and a fourth spur gear 72 is arranged on the drive shaft 56; wherein the first spur gear 69 is meshed with the second spur gear 70 for transmission, and the third spur gear 71 is meshed with the fourth spur gear 72 for transmission. Moreover, the first spur gear 69 is a pinion gear, and the second spur gear 70 is a large gear. The third spur gear 71 is a pinion gear, and the fourth spur gear 72 is a large gear. The above structural design enables the main reducer in the gearbox 5 of the off-road rally car to adopt a two-stage spur gear transmission and be integrated with the rear axle brake system of the vehicle into an integrated structure, so that the gearbox has a compact structure, a small volume, and a relatively light weight, which better meets the requirements of the lightweight design of the vehicle.

[0037] Figures 15 to 18 As shown together, the suspension system 3 includes front clevis 17 located at the inner sides of the two front wheels 4, each of which is fixed to the front side of the frame 1 through an upper double wishbone suspension 22 and a lower double wishbone suspension 23. The front clevis 17 includes a front clevis shaft 44, and one end of the front clevis shaft 44 is provided with an upper connecting portion 24 and a lower connecting portion 25. The front clevis 17 is also provided with a front connecting portion 26 for articulating a steering tie rod 27.

[0038] The upper double wishbone suspension 22 and the lower double wishbone suspension 23 are both A-type structures. The tips of the upper double wishbone suspension 22 and the lower double wishbone suspension 23 are respectively hinged to the upper connecting portion 24 and the lower connecting portion 25 of the front horn 17. The two ends of the other end of the upper double wishbone suspension 22 and the two ends of the other end of the lower double wishbone suspension 23 are respectively hinged to the front of the frame 1. The upper double wishbone suspension 22 and the lower double wishbone suspension 23 are both made of steel pipes with a material of BH1500, a diameter of 25.4 mm, and a wall thickness of 1.5 mm.

[0039] like Fig.17 and Fig.18 As shown together, in this embodiment, preferably, the end of the tip of the upper double wishbone suspension 22 and the end of the tip of the lower double wishbone suspension 23 are both provided with a mounting hole 36, a bearing outer ring 37 is fixedly provided in the mounting hole 36, a spherical bearing inner ring 38 is rotatably provided on the inner side of the bearing outer ring 37, and the upper and lower ends of the bearing inner ring 38 both extend to the outside of the bearing outer ring 37. A penetrating connection hole is provided in the middle of the bearing inner ring 38, and a clevis bolt 39 is provided in the connection hole.

[0040] like Fig.18 As shown, the end structure of the tip of the double wishbone suspension 22 is used as an example for explanation, and the bolt head of the clevis bolt 39 is located above the bearing inner ring 38. The bolt head of the clevis bolt 39 has a spherical surface that matches the outer dimensions of the bearing inner ring 38; specifically, the outer surface of the bolt head of the clevis bolt 39 and the outer surface of the bearing inner ring 38 are located on the same spherical surface. The upper part of the mounting hole 36 is provided with a positioning step that is flush with the upper end of the bearing outer ring 37, and the lower part of the mounting hole 36 is provided with a hole retaining ring groove, in which a hole retaining ring 73 is installed. The hole retaining ring 73 contacts the lower end surface of the bearing inner ring 38 and limits the lower end of the bearing inner ring 38.

[0041] A clevis bolt spacer 74 is provided between the bearing inner ring 38 and the upper connecting portion 24, and the clevis bolt spacer 74 is sleeved on the clevis bolt 39. The upper end of the clevis bolt spacer 74 is located on the inner side of the bearing inner ring 38, and the lower end of the clevis bolt spacer 74 abuts against the upper side surface of the upper connecting portion 24. A shaft shoulder 75 is provided on the clevis bolt spacer 74, and the upper end of the shaft shoulder 75 abuts against the lower end of the bearing inner ring 38. The outer surface of the shaft shoulder 75 is a spherical surface that matches the outer dimensions of the bearing inner ring 38, that is, the outer surface of the shaft shoulder 75 and the outer surface of the bearing inner ring 38 are located on the same spherical surface.

[0042] This structural design allows the bolt head of the clevis bolt 39 to rotate in the bearing outer ring 37 following the bearing inner ring 38, and the bolt head of the clevis bolt 39 will not interfere with the bearing outer ring 37. The clevis bolt spacer 74 is used to support and limit the inner ring 38 of the bearing and the upper connecting portion 24, and to maintain a certain height between the two, so that when the bolt head of the clevis bolt 39 rotates in the bearing outer ring 37 following the inner ring 38 of the bearing, the relative rotation angle and amplitude are larger. The end structure of the tip of the lower double fork arm suspension 23 is the same as the end structure of the tip of the above double fork arm suspension 22, and will not be repeated here. The end of the upper double fork arm suspension 22 and the end of the lower double fork arm suspension 23 are respectively fixed to the upper connecting portion 24 and the lower connecting portion 25 of the front clevis 17 by the clevis bolt 39.

[0043] When the end of the upper double wishbone suspension 22 or the end of the lower double wishbone suspension 23 is fixedly mounted on the upper connecting portion 24 or the lower connecting portion 25 by means of the clevis bolt 39, the bolt head of the clevis bolt 39 and the outer side of the bearing inner ring 38 are located on the same spherical surface, so that the relative rotation angle allowed between the bearing outer ring 37 and the bearing inner ring 38 is larger, and the relative rotation angle between the front clevis 17 and the upper double wishbone suspension 22, and the front clevis 17 and the lower double wishbone suspension 23 is increased. When the off-road rally car is traveling, if the road surface is undulating or an obstacle is encountered, the relative rotation angle between the front clevis 17 and the upper double wishbone suspension 22, or the relative rotation angle between the front clevis 17 and the lower double wishbone suspension 23 is increased, the angle adjustment is flexible, and the car is not easy to roll over, so that the whole vehicle passability of the off-road rally car is better.

[0044] The suspension system 3 also includes a horizontally arranged front wheel shaft 18 and a front wheel core 15 fixed to the end of the front wheel shaft 18. The front wheel shaft 18 or the front wheel core 15 is rotatably connected to the front horn shaft 44. In this embodiment, preferably, a horizontally penetrating through hole is provided in the middle of the front horn shaft 44, and the front wheel core 15 is rotatably mounted in the through hole, and a bearing is provided between the front horn shaft 44 and the front wheel core 15.

[0045] The front wheel core 15 is a flange structure, including a cylindrical body 41 and a flange 42 located at the end of the body 41, and the flange 42 is provided with four evenly arranged mounting holes. Preferably in this embodiment, the flange 42 is made of quenched and tempered steel and is made by CNC processing. The flange 42 is provided with a "cross" convex reinforcement structure and a fan-shaped cavity. This design increases the structural strength of the flange 42 while reducing the weight of the flange 42. The flange 42 is fixedly connected to the hub 19 of the wheel 4 by fasteners. A plurality of mounting portions 43 are provided on the side of the flange 42 away from the hub 19, and the plurality of mounting portions 43 are used to fix the brake disc 16. Preferably in this embodiment, four mounting portions 43 are provided on the flange 42. The four mounting portions 43 are located on the peripheral side of the body 41, and a gap is provided between the mounting portion 43 and the body 41. The body 41 is rotatably mounted in the through hole of the front horn shaft 44.

[0046] The middle of the body 41 of the front wheel core 15 is provided with a through hole that penetrates from left to right, and the front wheel axle 18 penetrates the through hole. The front wheel axle 18 is provided with a first spline segment 34, and the through hole is provided with a spline hole 35 that matches the outer dimensions of the first spline segment 34, and the first spline segment 34 is installed in the spline hole 35. The front wheel core 15 and the front wheel axle 18 are connected by the first spline segment 34 and the spline hole 35 to achieve circumferential fixation between the two. The end of the front wheel axle 18 is provided with a threaded segment, and a nut is installed on the threaded segment for axial fixation of the front wheel core 15 on the front wheel axle 18.

[0047] like Fig.15 , Fig.16 , Fig.17 and Fig.18 As shown together, one end of the front wheel shaft 18 close to the inside of the off-road rally car extends to the outside of the front wheel core 15, and a second universal joint 40 is provided on the front wheel shaft 18. The second universal joint 40 is connected to the half shaft 51 through the second transmission shaft 20. One end of the second transmission shaft 20 is ball-connected to the second universal joint 40, and the other end is ball-connected to the half shaft 51. A front wheel brake caliper 21 adapted to the brake disc 16 is fixedly mounted on the front horn 17.

[0048] In this embodiment, preferably, the second universal joint 40 is a ball cage universal joint, and the front wheel brake caliper 21 is a single-piston floating caliper.

[0049] like Fig.19 and Fig. 20As shown together, the suspension system 3 also includes a horizontally arranged rear wheel axle 46, a rear wheel core 47 fixed to the end of the rear wheel axle 46, and a rear horn 45 located on the inner side of the rear wheel 4; the rear wheel core 47 is fixedly connected to the rear wheel 4. A third universal joint 49 is fixedly arranged at one end of the rear wheel axle 46, the rear horn 45 is rotatably mounted at the middle of the rear wheel axle 46, and the rear wheel core 47 is fixed at the other end of the rear wheel axle 46. Specifically, the rear horn 45 is sleeved on the middle of the rear wheel axle 46, and a bearing is arranged between the rear horn 45 and the rear wheel axle 46. The ends of the rear wheel axle 46 are provided with a spline section and a threaded section in sequence, the middle of the rear wheel core 47 is provided with a spline hole, the spline hole of the rear wheel core 47 is sleeved on the spline section of the rear wheel axle 46, and a fastening nut is installed on the threaded section of the rear wheel axle 46. The fastening nut fixes the rear wheel core 47 to the rear wheel axle 46 from one end, thereby achieving axial fixation of the rear wheel core 47 on the rear wheel axle 46.

[0050] The third universal joint 49 is connected to the drive shaft 56 through the third transmission shaft 50. One end of the third transmission shaft 50 is ball-connected to the third universal joint 49, and the other end is ball-connected to the drive shaft 56. In this embodiment, the third universal joint 49 is preferably a ball cage universal joint.

[0051] In this embodiment, the rear wheel core 47 is preferably a cross-shaped plate structure with a concave middle, and is made of 20CrMoTi alloy steel. The concave portion in the middle of the rear wheel core 47 forms an escape area 48, which provides a space for the fastening nut at the end of the rear wheel shaft 46, so that there is no interference between the fastening nut and the wheel 4, and the structure is compact and the parts are light; the rear wheel core 47 with this structural design can reduce the weight by 300 grams compared with the rear wheel core structure in the prior art.

[0052] like Fig.19 and Fig. 20As shown in common, the upper end of the rear horn 45 is provided with an upper fixing portion 28, and the lower end is provided with a lower fixing portion 29, and the upper fixing portion 28 is connected to the frame 1 through the upper tie rod 63. The lower fixing portion 29 is connected to the frame 1 through the lower tie rod 64. Specifically, fish eye ball heads 65 are provided at both ends of the upper tie rod 63 and the lower tie rod 64. The fish eye ball heads 65 at both ends of the upper tie rod 63 are threadedly connected to the upper tie rod 63, and the thread rotation directions of the two fish eye ball heads 65 on the upper tie rod 63 are opposite. The fish eye ball heads 65 at both ends of the lower tie rod 64 are threadedly connected to the lower tie rod 64, and the thread rotation directions of the two fish eye ball heads 65 on the lower tie rod 64 are opposite. That is, when in use, rotating the middle part of the upper tie rod 63 can adjust the length of the upper tie rod 63; rotating the middle part of the lower tie rod 64 can adjust the length of the lower tie rod 64, and the length adjustment range of a single fish eye ball head 65 is 5 to 6 mm. The fisheye ball head 65 at one end of the upper tie rod 63 is hinged to the upper fixing portion 28, and the fisheye ball head 65 at the other end is hinged to the vehicle frame 1. The fisheye ball head 65 at one end of the lower tie rod 64 is hinged to the lower fixing portion 29, and the fisheye ball head 65 at the other end is hinged to the vehicle frame 1. When assembling and debugging the off-road rally car, by adjusting the length of the upper tie rod 63 and / or the lower tie rod 64, the rear horn 45 is swung in the vertical plane, and then the angle between the rear horn 45 and the vertical direction is adjusted, and then the vertical angle of the wheel 4 installed thereon is adjusted to achieve the adjustment of the wheel inclination or camber.

[0053] like Fig.19 and Fig. 20 As shown in the figures, a trailing arm 66 is provided between the rear horn 45 and the vehicle frame 1. A fish eye ball head 65 is provided at the front end of the trailing arm 66, the fish eye ball head 65 of the trailing arm 66 is hinged on the vehicle frame 1, and the rear end of the trailing arm 66 is fixed on the rear horn 45. When assembling and debugging the off-road rally car, the length of the trailing arm 66 can be adjusted through the fish eye ball head 65, thereby adjusting the positive and negative and size of the toe angle of the towing wheel 4.

[0054] The truss-type vehicle frame 1 includes a trapezoidal front 30, a cage-type roll cage 31 and a support frame 32 connected in sequence from front to back. The inner side of the cage-type roll cage 31 is a cockpit 33, and the inner side of the support frame 32 is used to install the power system and the gearbox 5. The cage-type roll cage 31 is welded with a steel pipe with a diameter of 30 mm and a wall thickness of 1.6 mm made of BH1500. A sports seat made of fiberglass is installed at the rear end of the bottom of the cockpit 33.

[0055] The off-road rally racing car of the present invention has the advantages of being lighter, compact, easy to operate, excellent in passability, high in safety, etc. The lighter vehicle has sufficient power performance, and the vehicle has small friction resistance during running, good passability on uneven roads, and is not easy to roll over, which is conducive to improving competition results.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An off-road rally car, characterized in that: The vehicle comprises a frame (1) and a transmission system (2) mounted on the frame (1); the frame (1) is mounted with wheels (4) via a suspension system (3); The transmission system (2) comprises a gearbox (5) mounted on the rear of the vehicle frame (1) and a differential (6) mounted on the front of the vehicle frame (1); the gearbox (5) and the differential (6) are connected in transmission via a first transmission shaft (7) arranged at the front and rear; The gearbox (5) comprises a housing (57) and a drive shaft (56) rotatably mounted on the housing (57); The drive shaft (56) is provided with a second spline segment (59), and a floating central brake disc (60) is mounted on the second spline segment (59); the floating central brake disc (60) is mounted on the second spline segment (59) in a floating manner via a spline flange (61).

2. The off-road rally car according to claim 1, characterized in that: The gearbox (5) further comprises a rear reversing shaft (10) rotatably mounted on the housing (57); the rear reversing shaft (10) is horizontally arranged along the front-rear direction, the drive shaft (56) is horizontally arranged along the left-right direction, and the axis of the drive shaft (56) is perpendicular to the axis of the rear reversing shaft (10); a large bevel gear (11) is fixedly mounted on the drive shaft (56), and a small bevel gear (12) meshing with the large bevel gear (11) is fixedly mounted on the rear reversing shaft (10); and both ends of the first transmission shaft (7) are respectively connected to the front reversing shaft (9) and the rear reversing shaft (10) through a first universal joint (8).

3. The off-road rally car according to claim 2, characterized in that: The transmission ratio between the small bevel gear (12) and the large bevel gear (11) is the same as the transmission ratio between the driving gear (54) and the ring gear (14).

4. The off-road rally car according to claim 1, characterized in that: A spline flange (61) is mounted on the second spline segment (59); a spline hole matching the size of the second spline segment (59) is provided in the middle of the spline flange (61); the second spline segment (59) passes through the spline hole; the spline flange (61) can move along the axial direction of the second spline segment (59); and a floating central brake disc (60) is fixed on the spline flange (61).

5. The off-road rally car according to claim 4, characterized in that: It also includes a central brake caliper (62) adapted to the floating central brake disc (60), wherein the floating central brake disc (60) is located in a gap between two brake pads of the central brake caliper (62); when the floating central brake disc (60) rotates with the drive shaft (56), the floating central brake disc (60) is located between the two brake pads of the central brake caliper (62).

6. The off-road rally car according to claim 1, characterized in that: The differential (6) comprises a housing (13) fixed to the vehicle frame (1), a ring gear (14) rotatably mounted on the housing (13), and a front reversing shaft (9) rotatably mounted on the vehicle frame (1), wherein the end of the front reversing shaft (9) is provided with a driving gear (54) meshing with the ring gear (14) for transmission; the axis of the front reversing shaft (9) is perpendicular to the axis of the ring gear (14), and the ring gear (14) and the driving gear (54) are both bevel gears; The ring gear (14) is provided with two planetary gear carriers (55) arranged at intervals, each planetary gear carrier (55) is provided with a rotatable planetary gear (53), and the axis of the planetary gear (53) is perpendicular to the axis of the ring gear (14); the vehicle frame (1) is also provided with two rotatable half shafts (51), and half shaft gears (52) are fixedly arranged on the half shafts (51); the half shafts (51) are arranged on the inner side of the ring gear (14), and the axis of the half shafts (51) coincides with the axis of the ring gear (14); the two planetary gears (53) are meshed with the two half shaft gears (52) for transmission; the half shaft gears (52) and the planetary gears (53) are both bevel gears.

7. The off-road rally car according to any one of claims 1 to 6, characterized in that: The suspension system (3) comprises front cleats (17) respectively located on the inner sides of the two front wheels (4), and the two front cleats (17) are both fixed to the front side of the frame (1) via an upper double wishbone suspension (22) and a lower double wishbone suspension (23); The upper double wishbone suspension (22) and the lower double wishbone suspension (23) are both A-type structures; The tips of the upper double wishbone suspension (22) and the lower double wishbone suspension (23) are respectively hinged to the upper connecting portion (24) and the lower connecting portion (25) of the front horn (17); the two end portions of the other end of the upper double wishbone suspension (22) and the two end portions of the other end of the lower double wishbone suspension (23) are respectively hinged to the front portion of the vehicle frame (1).

8. The off-road rally car according to claim 7, characterized in that: The tip end of the upper double wishbone suspension (22) and the tip end of the lower double wishbone suspension (23) are both provided with mounting holes (36), a bearing outer ring (37) is fixedly provided in the mounting hole (36), a spherical bearing inner ring (38) is rotatably provided on the inner side of the bearing outer ring (37), a through connecting hole is provided in the middle of the bearing inner ring (38), a clevis bolt (39) is provided in the connecting hole, and the bolt head of the clevis bolt (39) is a spherical surface that matches the shape of the bearing inner ring (38); the end of the upper double wishbone suspension (22) and the end of the lower double wishbone suspension (23) are respectively fixed to the upper connecting portion (24) and the lower connecting portion (25) of the front clevis (17) by means of the clevis bolt (39).

9. The off-road rally car according to claim 7, characterized in that: The suspension system (3) further comprises a horizontally arranged front wheel shaft (18) and a front wheel core (15) fixed to the end of the front wheel shaft (18); the front wheel shaft (18) or the front wheel core (15) is rotatably connected to the front horn shaft (44); a horizontally penetrating through hole is provided in the middle of the front horn shaft (44), the front wheel core (15) is rotatably mounted in the through hole, and a bearing is provided between the front horn shaft (44) and the front wheel core (15); The front wheel core (15) is a flange structure, comprising a cylindrical body (41) and a flange (42) located at the end of the body (41), and the flange (42) is provided with four evenly arranged mounting holes; the flange (42) is fixedly connected to the wheel hub (19) of the wheel (4); a brake disc (16) is fixed to the side of the flange (42) away from the wheel hub (19); The body (41) is rotatably mounted in the through hole of the front horn shaft (44); A through hole is provided in the middle of the body (41) of the front wheel core (15) and passes through it on the left and right sides. The front wheel shaft (18) passes through the through hole. The front wheel shaft (18) is provided with a first spline segment (34). The through hole is provided with a spline hole (35) that matches the outer dimensions of the first spline segment (34). The first spline segment (34) is installed in the spline hole (35). The front wheel core (15) and the front wheel shaft (18) are connected via the first spline segment (34) and the spline hole (35) to achieve circumferential fixation between the two. A threaded segment is provided at the end of the front wheel shaft (18). A nut is installed on the threaded segment to fix the front wheel core (15) on the front wheel shaft (18) in the axial direction. One end of the front wheel shaft (18) close to the inside of the off-road rally car extends to the outside of the front wheel core (15), and a second universal joint (40) is provided on the front wheel shaft; the second universal joint (40) is connected to the half shaft (51) through the second transmission shaft (20); one end of the second transmission shaft (20) is connected to the ball of the second universal joint (40), and the other end is connected to the ball of the half shaft (51); a front wheel brake caliper (21) adapted to the brake disc (16) is fixedly mounted on the front horn (17).

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