CN108327479A - A kind of active power for offroad vehicle adjusts suspension system - Google Patents

Abstract

The invention discloses an active power adjustment suspension system for an off-road vehicle. The front torsion bar and the rear torsion bar are installed on the vehicle body; connecting rod; the connecting rod includes a front connecting rod connected with the front torsion bar and a rear connecting rod connected with the rear torsion bar; the front connecting rod is connected with the front hydraulic cylinder, and the rear connecting rod is connected with the rear hydraulic cylinder; the front hydraulic cylinder It communicates with both ends of the rear hydraulic cylinder to form two closed oil circuits; the upper chamber of the front hydraulic cylinder and the rear hydraulic cylinder communicates with the upper chamber of the middle hydraulic cylinder, and the lower chamber communicates with the lower chamber of the middle hydraulic cylinder; the upper chamber of the middle hydraulic cylinder The piston rod is connected with a locking adjustment mechanism. The active power adjustment suspension system of the present invention can achieve both anti-roll performance and anti-torsion performance of the vehicle, can increase the roll stiffness of the vehicle when turning, make the vehicle have good roll stability, and at the same time, can eliminate the torsion of the vehicle body Load, increase the wheel travel, so that the vehicle has good off-road passability.

Description

An Active Power Adjustment Suspension System for Off-Road Vehicles

technical field

This patent belongs to the mechanical field, and in particular relates to an active power adjustment suspension system for off-road vehicles.

Background technique

With the development of vehicle technology, the speed of vehicles is getting faster and faster. When cornering, vehicle rollover accidents caused by excessive speed frequently occur. Therefore, most cars are now equipped with stabilizer bars. The stabilizer bar is an important component of the suspension system of a city car. The left and right wheels are flexibly connected by a U-shaped stabilizer bar, which can significantly increase the roll stiffness of the vehicle and improve the stability of the vehicle when driving on curves.

Although the stabilizer bar is very important for urban cars, the disadvantage of the stabilizer bar for off-road vehicles is that there is a torsion bar connection between the left and right wheels, which does not allow large relative motion of the left and right wheels, which limits the travel of the left and right wheels in the opposite direction. , the body is subject to a large torsional load, and the vehicle often has a large relative movement of the left and right wheels on the rough off-road road. At this time, if one side of the driving wheel drives the wheel off the ground, it will cause the wheel off the ground to spin. Make it difficult for vehicles to pass through potholes and rough roads. Therefore, it is not advisable to install a stabilizer bar on an off-road vehicle driving in the wild.

But above-mentioned two kinds of road conditions are all unavoidable in people's daily life, off-road vehicle also often needs to run on city road, and because off-road vehicle has higher chassis, makes it have larger roll angle when turning at high speed. Therefore, people hope that off-road vehicles have both rolling stability under urban road conditions and passability under off-road surfaces, and traditional stabilizer bars cannot reconcile the contradiction between these two performances.

Contents of the invention

In order to solve the above problems, the present invention discloses an active power adjustment suspension system for an off-road vehicle. The present invention utilizes the hydraulic system to lock the horizontal stabilizer bar when the turning roll or the same-side suspension movement is the same and the phase is opposite to that of the other-side suspension movement, so that the present invention can play the anti-rolling effect of the ordinary horizontal stabilizer bar. The present invention can decouple the lateral stabilizer bar when running on an off-road road, so that it can decouple the left and right wheels, eliminate the torsion of the vehicle body, and enhance the passability on rough roads.

To achieve the above object, the technical solution of the present invention is:

An active power adjustment suspension system for an off-road vehicle, a front torsion bar and a rear torsion bar installed on the vehicle body; one side of the front torsion bar and the rear torsion bar are connected to a wheel on one side of the vehicle body, and the other side is connected to a connecting rod; The connecting rod includes a front connecting rod connected with the front torsion bar and a rear connecting rod connected with the rear torsion bar; the front connecting rod is connected with the front hydraulic cylinder, and the rear connecting rod is connected with the rear hydraulic cylinder; the front hydraulic cylinder and the rear hydraulic cylinder The two ends of the cylinder are respectively connected to form two closed oil circuits; the upper chamber of the front hydraulic cylinder and the rear hydraulic cylinder are connected with the upper chamber of the middle hydraulic cylinder, and the lower chamber is connected with the lower chamber of the middle hydraulic cylinder; the piston rod of the middle hydraulic cylinder is connected with Lock adjustment mechanism.

As a further improvement, the locking adjustment mechanism is an electric screw mechanism; the electric screw mechanism includes a screw connected to the piston rod of the middle hydraulic cylinder; the screw is threadedly connected to a motor; the front hydraulic cylinder and the rear hydraulic cylinder The upper chamber communicates with the front end of the middle hydraulic cylinder; the lower chamber communicates with the rear end of the middle hydraulic cylinder.

As a further improvement, the lower end of the front hydraulic cylinder communicates with the lower end of the rear hydraulic cylinder through a first oil pipe; the upper end of the front hydraulic cylinder communicates with the upper end of the rear hydraulic cylinder through a second oil pipe.

As a further improvement, both the front torsion bar and the rear torsion bar are Z-shaped; the side where the front torsion bar and the rear torsion bar are directly connected to the wheel is the long arm end, and the side that is connected to the connecting rod is the short arm end; The arm end and the short arm end are connected through an intermediate connecting rod; both sides of the intermediate connecting rod are fixed with stoppers.

As a further improvement, the length of the short arm end is half of the length of the long arm end; the sum of the length of the short arm end and the length of the long arm end is equal to the length of the connecting rod; the short arm end is hingedly connected to the connecting rod through the front pin shaft; the front hydraulic pressure The piston rods of the cylinder and the rear hydraulic cylinder are respectively hinged with the connecting rod through the rear pin.

As a further improvement, the rear pin divides the connecting rod into a front section and a rear section; the length of the front section is equal to the end of the short arm, and the length of the rear section is equal to the end of the long arm.

As a further improvement, the lower end of the front hydraulic cylinder communicates with the lower end of the rear hydraulic cylinder, and the upper end of the front hydraulic cylinder communicates with the upper end of the rear hydraulic cylinder to form two closed oil circuits; the middle hydraulic cylinder and the locking adjustment mechanism are installed on Between the first oil pipe and the second oil pipe, the upper chamber of the middle hydraulic cylinder communicates with the second oil pipe, and the lower chamber communicates with the first oil pipe. The piston rod of the middle hydraulic cylinder forms an electric screw mechanism through the screw rod and the motor. It is used to generate an active force on the piston of the middle hydraulic cylinder to control the decoupling and locking of the front stabilizer bar and the rear stabilizer bar.

As a further improvement, the active control strategy of the active power adjustment suspension system is: when the vehicle is turning and rolls or the suspension on the same side moves in the same phase and is opposite to the suspension on the other side, the motor of the electric screw mechanism generates a The active force keeps the piston rod of the middle hydraulic cylinder fixed, and the oil in the front hydraulic cylinder and the rear hydraulic cylinder cannot flow, so that the piston rod and the cylinder body of the front hydraulic cylinder and the rear hydraulic cylinder are equivalent to being fixed and locked. Hold the connecting rod. At this time, the connecting rod generates an anti-rolling moment to the body to resist the body roll; when the vehicle is driving on an off-road road or a normal straight road, the motor of the electric screw mechanism does not generate active force, and the middle hydraulic cylinder The piston rod can move freely with the flow of oil, so that the piston rods of the front hydraulic cylinder and the rear hydraulic cylinder can also move freely, thereby releasing the constraint of the connecting rod on the wheel, so that the wheel can obtain a greater stroke and strengthen the vehicle Cross-country passability.

The active power adjustment suspension system of the present invention can achieve both anti-roll performance and anti-torsion performance of the vehicle, can increase the roll stiffness of the vehicle when turning, and make the vehicle have good roll stability. At the same time, it can eliminate the torsion of the vehicle body Load, increase the wheel travel, so that the vehicle has good off-road passability.

Description of drawings

Fig. 1 is a structural representation of the present invention

Figure 2 is a schematic structural diagram of the hydraulic system;

Fig. 3 is a schematic structural diagram of the electric screw mechanism and the connected hydraulic cylinder.

Detailed ways

The technical solutions of the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1-3, an active power adjustment suspension system for off-road vehicles includes: a Z-shaped front torsion bar 1 arranged between the vehicle body and the front wheel, and a short arm end and The front link 4 between the wheels, the front hydraulic cylinder 5 located between the vehicle body side and the front link 4, the Z-shaped rear torsion bar 14 located between the vehicle body and the rear wheel, and the rear torsion bar 14 The rear connecting rod 11 between the short arm end and the wheel, and the rear hydraulic cylinder 13 on the same side as the front hydraulic cylinder 5 are installed between the vehicle body and the rear connecting rod 11, and 2 oil pipes connecting the front and rear hydraulic cylinders are arranged on both sides. The hydraulic cylinder and the electric screw mechanism between the oil pipes.

The side directly connected to the front torsion bar 1 and the rear torsion bar 14 is the long arm end 20, and the side connected to the connecting rod is the short arm end 21; the long arm end 20 and the short arm end 21 are connected through an intermediate connecting rod 22 ; Both sides of the middle connecting rod 22 are fixed with limited blocks 15,16,17,18.

The Z-shaped torsion bar (that is, the front torsion bar 1 and the rear torsion bar 14) is connected with the vehicle body, the long arm end 20 is connected with the wheel, the short arm end 21 is connected with one end of the connecting rod, the other end of the connecting rod is connected with the wheel, and the piston of the hydraulic cylinder The rod is connected with the connecting rod, and the cylinder body of the hydraulic cylinder is connected with the vehicle body. The upper chamber of the front hydraulic cylinder 5 and the upper chamber of the rear hydraulic cylinder 13 are connected through the second oil pipe 9 to form an upper chamber circuit, and the lower chamber of the front wheel hydraulic cylinder 5 and the lower chamber of the rear wheel hydraulic cylinder 13 are passed through The first oil pipe 8 is connected to form the lower chamber circuit, the upper chamber circuit and the lower chamber circuit are connected through the middle hydraulic cylinder 7, and the piston rod of the middle hydraulic cylinder 7 is connected to the motor as a push rod to form an electric screw mechanism. The specific middle hydraulic cylinder 7 The piston rod is connected to the screw mandrel 19, and the screw mandrel 19 is threadedly connected with the motor 6.

The active power adjustment suspension system does not bear the vertical load of the vehicle. Under different road conditions and vehicle driving conditions, the relative movement between the body and the wheel assembly will cause the torsion of the torsion bar and the compression or tension of the hydraulic cylinder , resulting in fluid flow and pressure changes in the oil pipes 8, 9, real-time monitoring oil pressure of the oil pipes 8, 9 as the input of the motor 6, the motor pushes the piston rod of the middle hydraulic cylinder 7, thereby controlling the stability of the torsion bar and the connecting rod The lever is locked or uncoupled.

When the vehicle turns left or right at high speed, the long arm ends of the torsion bars 1 and 14 tend to move upwards or downwards. Due to the rotation of the torsion bars, the movement direction of the short arm ends is opposite to that of the long arm ends. Downward or upward movement; the end of the connecting rod 4 and 11 connected to the wheel has a tendency to move downward or upward, and the end hinged to the short arm end of the torsion bar also has a tendency to move downward or upward, resulting in hydraulic cylinders 5, 13 The piston rod has a tendency to move downward or upward, so that the pressure in the upper chamber of the hydraulic cylinder 5, 13 increases, the pressure in the lower chamber decreases, the pressure difference increases sharply, and the oil tends to flow out from the upper chamber and flow into the lower chamber ; The pressure in the second oil pipe 9 is the same as the pressure in the upper chamber of the hydraulic cylinder 5,13, the pressure in the first oil pipe 8 is the same as the pressure in the lower chamber of the hydraulic cylinder 5,13, and now the pressure difference between the upper and lower oil circuits is used as the pressure of the motor. The input value, the electric screw mechanism outputs a main force to act on the piston rod of the middle hydraulic cylinder 7 to keep it still. For the hydraulic cylinders 5 and 13, it is equivalent to offsetting the movement trend of the piston rod, that is, through the electric wire The active power of the rod mechanism makes the hydraulic cylinders 5, 13 equivalent to a vertical fixed link, so the rear pin shaft 3, 12 is equivalent to the fulcrum of rotation for the connecting rods 4 and 11. Acts like a traditional anti-roll bar. Therefore, when the end of the connecting rod 4,11 connected to the wheel moves downward or upward, and the long arm end of the torsion bar 1,14 moves upward or downward, the connecting rod 4,11 and the short arm of the torsion bar 1,14 respectively The front pin shafts 2 and 10 at the connection of the two ends move upward, causing torsion deformation of the torsion bars 1 and 14. The torsional rigidity of the torsion bars 1 and 14 is very large, which will inhibit the occurrence of this torsion, that is, the two torsion bars 1 and 14 The reaction force is generated at the end, and this reaction force acts on the wheel, which is manifested as exerting a force opposite to the direction of motion on the wheel, so that it can better contact the ground. The opposite moment resists the roll of the vehicle body, so that the vehicle can corner more stably.

When the vehicle is driving on a rough road with potholes, for example, the left front wheel and the right rear wheel pass through a boss or a pit, the long arm end of the front torsion bar 1 tends to move upward or downward, and the connection between the connecting rod 4 and the wheel There is a tendency to move upwards or downwards, while the right front wheel and the left rear wheel pass through the pit or the boss, the long arm end of the front torsion bar 1 has a tendency to move downwards or upwards, and the joint between the rear connecting rod 11 and the wheel has a The trend of downward or upward movement, at this time, the direction of movement of the piston rod of the hydraulic cylinder is opposite, the pressure difference between the oil pipes 8 and 9 is very small, the output of the motor is to make the piston rod of the middle hydraulic cylinder 7 move freely, and the oil can move freely. Flow, that is, the piston rods of the hydraulic cylinders 5 and 13 can move automatically; for the whole system, it is equivalent to releasing a constraint of the connecting rods 4 and 11, which can offset the torsion of the torsion bars 1 and 14, so that the ends of the two arms can move freely Therefore, the torsional load applied by the system to the body can be eliminated, while the suspension dynamic stroke is increased, and the grounding performance of the wheels is improved, which is beneficial to the passing performance of the vehicle on rough roads, and the off-road ability is greatly improved. And because the interconnection of the left and right wheels is removed, the comfort is improved.

It can be seen from the above text that the active power adjustment suspension system of the present invention can automatically control the state of the suspension system according to different driving conditions and vehicle states, so as to simultaneously improve the cross-country passability and roll stiffness of the vehicle, and effectively improve the stability of the vehicle. sexual effect.

It should be noted that although the embodiment of the present invention shows the structure that the cylinder body of the hydraulic cylinder 5 and 13 is connected with the vehicle body and the piston rod is connected with the connecting rod, those skilled in the art can understand that the cylinder body and the piston can be Inversion, thereby forming the structure that the cylinder body is connected with the connecting rod and the piston rod is connected with the vehicle body. At the same time, the hydraulic cylinder and the connecting rod can be installed on the left or right side of the vehicle body at will. The active control method of the piston rod of the middle hydraulic cylinder 7 is not only Limited to the screw mechanism described in the present invention, the fixing and loosening of the piston rod of the middle hydraulic cylinder 7 can also be realized by other means such as air ventilation.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and embodiment, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Further modifications can be effected, so the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (8)

1. an active power adjustment suspension system for off-road vehicles is characterized in that, a front torsion bar (1) and a rear torsion bar (14) are installed on the vehicle body; a front torsion bar (1) and a rear torsion bar ( 14) One side is connected to the wheel on one side of the vehicle body, and the other side is connected to the connecting rod; the connecting rod includes the front connecting rod (4) connected with the front torsion bar (1) and the rear connecting rod (14) connected with the rear torsion bar (14). rod (11); the front connecting rod (4) is connected with the front hydraulic cylinder (5), and the rear connecting rod (11) is connected with the rear hydraulic cylinder (13); the two front hydraulic cylinders (5) and the rear hydraulic cylinder (13) The ends are respectively connected to form two closed oil circuits; the upper chamber of the front hydraulic cylinder (5) and the rear hydraulic cylinder (13) is connected with the upper chamber of the middle hydraulic cylinder (7), and the lower chamber is connected with the lower chamber of the middle hydraulic cylinder (7). Connected; the piston rod of the middle hydraulic cylinder (7) is connected with a locking adjustment mechanism. 2. The active power adjustment suspension system for off-road vehicles as claimed in claim 1, wherein the locking adjustment mechanism is an electric screw mechanism; The screw rod (19) connected to the piston rod; the screw rod (19) is threadedly connected with the motor (6); the upper cavity of the front hydraulic cylinder (5) and the rear hydraulic cylinder (13) and the front end of the middle hydraulic cylinder (7) communicated; the lower chamber communicates with the rear end of the middle hydraulic cylinder (7). 3. The active power adjustment suspension system for off-road vehicles as claimed in claim 1, wherein the lower end of the front hydraulic cylinder (5) and the lower end of the rear hydraulic cylinder (13) pass through the first oil pipe (8) ) is communicated; the upper end of the front hydraulic cylinder (5) is communicated with the upper end of the rear hydraulic cylinder (13) through the second oil pipe (9). 4. the active power adjustment suspension system for off-road vehicle as claimed in claim 1, is characterized in that, described front torsion bar (1) and rear torsion bar (14) all are Z shape; Front torsion bar (1) ) and the rear torsion bar (14) are directly connected to the wheel as the long arm end (20), and the side connected to the connecting rod is the short arm end (21); the long arm end (20) and the short arm end (21 ) are connected by an intermediate connecting rod (22); both sides of the intermediate connecting rod (22) are fixed with stoppers. 5. the active power adjustment suspension system that is used for off-road vehicle as claimed in claim 4, is characterized in that, the length of described short arm end (21) is the half of long arm end (20) length; Short arm end ( The sum of the length of 21) and the length of the long arm end (20) is equal to the length of the connecting rod; the short arm end (21) is hingedly connected with the connecting rod through the front pin; the front hydraulic cylinder (5) and the rear hydraulic cylinder (13) The piston rods are respectively hinged with the connecting rod through the rear pin. 6. The active power adjustment suspension system for an off-road vehicle as claimed in claim 5, wherein the rear pin divides the connecting rod into a front section and a rear section; the front section is equal in length to the short arm end (21) , the back section is equal in length to the long arm end (20). 7. the active power adjustment suspension system for off-road vehicle as claimed in claim 1, is characterized in that, the lower end of described front hydraulic cylinder (5) communicates with the lower end of rear hydraulic cylinder (13), and front hydraulic cylinder ( 5) communicates with the upper end of the rear hydraulic cylinder (13) to form two closed oil circuits; the middle hydraulic cylinder (7) and the locking adjustment mechanism are installed between the first oil pipe (8) and the second oil pipe (9) Between, the upper chamber of the middle hydraulic cylinder (7) is connected with the second oil pipe (9), the lower chamber is connected with the first oil pipe (8), the piston rod of the middle hydraulic cylinder (7) is connected with the motor through the screw rod (19) (6) An electric screw mechanism is formed, which is used to generate an active force on the piston of the middle hydraulic cylinder (7) to control the decoupling and locking of the front stabilizer bar and the rear stabilizer bar. 8. The active power adjustment suspension system for an off-road vehicle according to claim 2, wherein the active control strategy of the active power adjustment suspension system is: when the vehicle turns and rolls or the suspension on the same side moves When the phase is the same and opposite to the movement of the suspension on the other side, the motor (6) of the electric screw mechanism generates an active force, so that the piston rod of the middle hydraulic cylinder (7) remains fixed, and the front hydraulic cylinder (5) and the rear hydraulic cylinder The oil in the cylinder (13) cannot flow, so that the piston rod and the cylinder body of the front hydraulic cylinder (5) and the rear hydraulic cylinder (13) are equivalent to being fixed, and the connecting rod is locked. Anti-rolling moment, resisting body roll; when the vehicle is running on an off-road road or a normal straight road, the motor of the electric screw mechanism does not generate active force, and the piston rod of the middle hydraulic cylinder (7) can move along with the oil The flow and free movement of the front hydraulic cylinder (5) and the piston rod of the rear hydraulic cylinder (13) can also move freely, thereby releasing the constraint of the connecting rod on the wheel, so that the wheel can obtain a greater stroke and enhance the cross-country passing of the vehicle. sex.