Front suspension system for cross-country racing car

Abstract

The utility model relates to the technical field of racing cars, in particular to a front suspension system for a cross-country racing car, which comprises a front cleat, a front axle and a front wheel core fixed on the front axle, the front wheel core comprises a cylindrical body and a flange plate located at the end of the body. The front cleat comprises a front cleat shaft, and the body is rotationally installed in the middle of the front cleat shaft. The flange plate is fixedly connected with a hub of the wheel; a brake disc is fixed on the flange plate; front wheel brake calipers matched with the brake disc are fixedly installed on the front cleat. The front cleat is installed on the front side portion of the racing car frame through the upper double-fork-arm suspension and the lower double-fork-arm suspension. The front cleat is further provided with a front connecting part used for being hinged to a racing car steering pull rod. The front suspension system for the cross-country racing car is good in stability and flexible in steering, facilitates improvement of racing results of the racing car, has the advantages of being simple and compact in structure, high in control sensitivity and the like, and better meets the requirement for light-weight design of the car under the condition that the braking performance is met.

Description

Technical Field

[0001] The present invention relates to the technical field of racing cars, and in particular to a front suspension system for off-road rally racing cars. Background Art

[0002] Baja racing originated in the United States and is the predecessor of the Formula Student car competition. The SAE-China Baja Series (BSC) requires participating teams to participate in a variety of static and dynamic tests. Dynamic tests include traction, hill climbing, straight-line acceleration, and endurance testing. The competition places stringent demands on a vehicle's power, handling stability, and braking performance, while also demanding excellent endurance. Therefore, vehicles must possess high strength, low weight, and excellent dynamic response to complete the various competition tasks.

[0003] The existing wheel suspension and brake systems suffer from complex structures and heavy weight. For smaller BAJA racing cars, the suspension and brake discs account for a significant portion of the vehicle's mass. While the larger brake discs provide sufficient braking force, their greater mass negatively impacts the vehicle's dynamics. BAJA racing cars also suffer from a narrow front horn rotation angle, resulting in inflexible steering. This results in a large turning radius, low handling agility, poor passability, and a high risk of accidents. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a front suspension system for off-road rally racing cars in response to the above shortcomings. The system has the advantages of simple and compact structure, high control sensitivity, good stability, flexible steering, which is conducive to improving the racing results of the car and further meets the requirements of vehicle lightweight design while meeting the braking performance.

[0005] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] A front suspension system for an off-road rally car comprises a front cleat, a horizontally arranged front wheel axle and a front wheel core fixed to the front wheel axle; the front wheel core comprises a cylindrical body and a flange located at the end of the body; the front cleat comprises a front cleat shaft, a horizontally penetrating through-hole is provided in the middle of the front cleat shaft, and the body of the front wheel core is rotatably mounted in the through-hole; a bearing is provided between the front cleat shaft and the front wheel core.

[0007] As an improvement, the flange is provided with multiple mounting holes; the flange is fixedly connected to the wheel hub through the mounting holes and fasteners; multiple mounting parts are provided on the side of the flange away from the wheel hub; the mounting parts are located on the circumferential side of the main body, and the multiple mounting parts are used to fix the brake disc; a front wheel brake caliper that is compatible with the brake disc is fixedly installed on the front horn.

[0008] As an improvement, the front wheel brake caliper is a single-piston floating caliper.

[0009] As an improvement, a through hole is provided in the middle of the body of the front wheel core, which passes through the left and right sides. The front wheel axle passes through the through hole. A spline section is provided on the front wheel axle, and a spline hole is provided on the through hole which is adapted to the outer dimensions of the spline section. The spline section is installed in the spline hole; a threaded section is provided at the end of the front wheel axle, and a nut is installed on the threaded section.

[0010] As an improvement, the end of the front wheel axle close to the inside of the off-road rally car extends to the outside of the front wheel core, and is provided with a universal joint; the universal joint is connected to the half-axle of the car through the second transmission shaft.

[0011] As an improvement, the universal joint is a ball cage type universal joint.

[0012] As an improvement, the front ram is installed on the front side of the racing car frame through an upper double wishbone suspension and a lower double wishbone suspension; one end of the front ram shaft is provided with an upper connecting portion and a lower connecting portion; the upper double wishbone suspension and the lower double wishbone suspension are both A-type structures; the tips of the upper double wishbone suspension and the lower double wishbone suspension are respectively hinged to the upper connecting portion and the lower connecting portion of the front ram; the two end portions of the other end of the double wishbone suspension and the two end portions of the other end of the lower double wishbone suspension are respectively hinged to the front of the racing car frame.

[0013] As an improvement, the end of the upper double wishbone suspension tip and the end of the lower double wishbone suspension tip are both provided with mounting holes, a bearing outer ring is fixedly installed in the mounting hole, a spherical bearing inner ring is rotatably provided on the inner side of the bearing outer ring, and the upper and lower ends of the bearing inner ring both extend to the outside of the bearing outer ring; a penetrating connecting hole is provided in the middle of the bearing inner ring, and a clevis bolt is provided in the connecting hole.

[0014] As an improvement, the front horn is also provided with a front connecting portion for articulating the steering rod of the racing car.

[0015] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0016] The front suspension system for off-road rally racing of this technical solution has a front wheel core body, a front clevis shaft, and a brake disc arranged in sequence on the outside of the front wheel axle, which makes reasonable use of space and has a more compact structure.

[0017] The front wheel core and front axle are connected by a spline segment and spline hole, achieving circumferential fixation between them. The end of the front axle is provided with a threaded segment, which is mounted with a nut to secure the front wheel core axially to the front axle. This structure ensures a more stable and secure connection between the front wheel core and the front axle.

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the front suspension system for off-road rally racing in this utility model. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the front suspension system for off-road rally racing in this utility model. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structure of the front suspension system of the off-road rally car of the present invention. Figure 3 ;

[0022] Figure 4 This is a reference diagram of the front suspension system for off-road rally racing of the present invention in use;

[0023] Among them: 4-wheel, 15-front wheel core, 16-brake disc, 17-front clevis, 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 connecting part, 25-lower connecting part, 26-front connecting part, 27-steering rod, 34-spline section, 35-spline hole, 36-mounting hole, 37-bearing outer ring, 38-bearing inner ring, 39-clevis bolt, 40-universal joint, 41-body, 42-flange, 43-mounting part, 44-front clevis shaft, 51-half shaft. DETAILED DESCRIPTION

[0024] For ease of explanation and not limitation, when used in rallycross, the direction to the driver's left is defined as left, and the direction to the driver's right is defined as right. The direction in front of the driver is defined as front, and the direction behind the driver is defined as rear, and up and down are derived from these. The direction closest to the center of the rallycross car is defined as inside, and the direction opposite to it is defined as outside.

[0025] Example

[0026] Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a front suspension system for an off-road rally car includes a front clevis 17 located inside the car's wheel 4. The front clevis 17 is mounted to the front side of the car's frame via an upper double wishbone suspension 22 and a lower double wishbone suspension 23. The front clevis 17 includes a front clevis shaft 44, one end of which is provided with an upper connecting portion 24 and a lower connecting portion 25. The front clevis 17 also has a front connecting portion 26 for articulating the car's steering tie rod 27.

[0027] Both the upper double wishbone suspension 22 and the lower double wishbone suspension 23 are A-type structures. The tips of the upper and lower double wishbone suspensions 22 and 23 are hinged to the upper and lower connecting portions 24 and 25 of the front clevis 17, respectively. The other ends of the upper and lower double wishbone suspensions 22 and 23 are hinged to the front of the racing car frame. Both the upper and lower double wishbone suspensions 22 and 23 are made of BH1500 steel pipe with a diameter of 25.4 mm and a wall thickness of 1.5 mm.

[0028] Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown together, in this embodiment, preferably, the tip ends of the upper double wishbone suspension 22 and the tip ends of the lower double wishbone suspension 23 are each provided with a mounting hole 36. A bearing outer ring 37 is fixedly mounted in the mounting hole 36. A spherical bearing inner ring 38 is rotatably mounted on the inner side of the bearing outer ring 37. The upper and lower ends of the bearing inner ring 38 both extend outside the bearing outer ring 37. A through-hole is provided in the middle of the bearing inner ring 38, and a clevis bolt 39 is mounted in the connecting hole.

[0029] The front suspension system for an off-road rally car also includes a horizontally disposed front wheel axle 18 and a front wheel core 15 fixed to the end of the front wheel axle 18. The front wheel axle 18 or the front wheel core 15 is rotatably connected to a front clevis shaft 44. In this embodiment, a horizontal through-hole is preferably provided in the middle of the front clevis shaft 44, into which the front wheel core 15 is rotatably mounted. A bearing is provided between the front clevis shaft 44 and the front wheel core 15, allowing for greater flexibility when the two rotate relative to each other.

[0030] 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 CNC processing, and is provided with a "cross" raised 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 circumferential 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.

[0031] The front wheel core 15 has a central through-hole extending left and right through the body 41. The front wheel axle 18 passes through this through-hole. The front wheel axle 18 is provided with a spline section 34. The through-hole is provided with a spline hole 35 that matches the outer dimensions of the spline section 34. The spline section 34 is mounted within the spline hole 35. The spline section 34 and the spline hole 35 connect the front wheel core 15 and the front wheel axle 18, achieving circumferential fixation between them. The front wheel axle 18 has a threaded section at its end, which is fitted with a nut to secure the front wheel core 15 axially to the front wheel axle 18.

[0032] Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the end of the front axle 18, located near the inside of the rally car, extends to the exterior of the front wheel hub 15. A universal joint 40 is mounted on the axle 40. Universal joint 40 is connected to the axle shaft 51 of the racing car via a second drive shaft 20. One end of the second drive shaft 20 is ball-connected to universal joint 40, and the other end is ball-connected to axle shaft 51. A front brake caliper 21, which mates with the brake disc 16, is fixedly mounted on the front clevis 17.

[0033] In this embodiment, preferably, the universal joint 40 is a ball cage type universal joint, and the front wheel brake caliper 21 is a single-piston floating caliper.

[0034] The front suspension system for an off-road rally car of the present invention has the advantages of simple and compact structure, high control sensitivity, good stability, and flexible steering, which is conducive to improving the racing results of the car. While meeting the braking performance requirements, it further meets the requirements of the vehicle lightweight design.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are 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 will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A front suspension system for an off-road rally car, characterized by: It includes a front horn (17), a horizontally arranged front wheel shaft (18), and a front wheel core (15) fixed on the front wheel shaft (18); The front wheel core (15) includes a cylindrical body (41) and a flange (42) located at the end of the body (41); The front ram horn (17) includes a front ram horn shaft (44), a horizontal through-hole is provided in the middle of the front ram horn shaft (44), and the body (41) of the front wheel core (15) is rotatably mounted in the through-hole; a bearing is provided between the front ram horn shaft (44) and the front wheel core (15).

2. The front suspension system for an off-road rally car according to claim 1, wherein: The flange (42) is provided with a plurality of mounting holes; the flange (42) is fixedly connected to the hub (19) of the wheel (4) through the mounting holes and fasteners; A plurality of mounting portions (43) are provided on a side of the flange (42) away from the wheel hub (19); the mounting portions (43) are located on the peripheral side of the body (41), and the plurality of mounting portions (43) are used to fix the brake disc (16); a front wheel brake caliper (21) adapted to the brake disc (16) is fixedly mounted on the front horn (17).

3. The front suspension system for an off-road rally car according to claim 2, wherein: The front wheel brake caliper (21) is a single-piston floating caliper.

4. The front suspension system for an off-road rally car according to claim 1, wherein: A through hole is provided in the middle of the body (41) of the front wheel core (15) and passes through the through hole. The front wheel shaft (18) passes through the through hole. A spline section (34) is provided on the front wheel shaft (18). A spline hole (35) having an outer size matching that of the spline section (34) is provided on the through hole. The spline section (34) is installed in the spline hole (35). A threaded section is provided at the end of the front wheel shaft (18), and a nut is installed on the threaded section.

5. The front suspension system for an off-road rally car according to claim 1, wherein: 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 is provided with a universal joint (40); the universal joint (40) is connected to the half shaft of the car through the second transmission shaft (20).

6. The front suspension system for an off-road rally car according to claim 5, wherein: The universal joint (40) is a ball cage type universal joint.

7. The front suspension system for an off-road rally car according to any one of claims 1 to 5, characterized in that: The front ram (17) is mounted on the front side of the racing car frame via an upper double wishbone suspension (22) and a lower double wishbone suspension (23); one end of the front ram shaft (44) is provided with an upper connecting portion (24) and a lower connecting portion (25); 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 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 part of the racing car frame.

8. The front suspension system for an off-road rally car according to claim 7, wherein: 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 provided on the inner side of the bearing outer ring (37) and is rotatably provided, and the upper end and the lower end of the bearing inner ring (38) both extend to the outside of the bearing outer ring (37); a through connection hole is provided in the middle of the bearing inner ring (38), and a clevis bolt (39) is provided in the connection hole.

9. The front suspension system for an off-road rally car according to claim 7, wherein: The front horn (17) is also provided with a front connecting portion (26) for articulating a steering rod (27) of a racing car.

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