Vehicle stabilizer system

• US 7,896,360 B2
• Filed: 02/02/2007
• Issued: 03/01/2011
• Est. Priority Date: 02/09/2006
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Buma, Shuuichi
• Primary Examiner(s): Dickson; Paul N
• Assistant Examiner(s): BROWN, DREW J
• Application Number:
  US12/278,902
• Publication Number:
  US 20100164189A1
• Time in Patent Office: 1,488 Days
• Field of Search: 280/5.511, 280/5.502, 280/5.506, 280/5.52, 280/5.51, 280/5.521
• US Class Current: 280/5.511
• CPC Class Codes: B60G 17/0161 mainly during straight-line motion B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 21/0555 including an actuator inducing vehicle roll
• CPC Class Codes: B60G 2200/18 Multilink suspensions, e.g. elastokinematic arrangements
• CPC Class Codes: B60G 2200/184 Assymetric arrangements
• CPC Class Codes: B60G 2200/46 camber angle
• CPC Class Codes: B60G 2200/462 Toe-in/out
• CPC Class Codes: B60G 2202/42 Electric actuator
• CPC Class Codes: B60G 2202/442 Rotary actuator
• CPC Class Codes: B60G 2204/1224 End mounts of stabiliser on wheel suspension
• CPC Class Codes: B60G 2204/419 Gears
• CPC Class Codes: B60G 2206/11 the arm being a radius or track or torque or steering rod or stabiliser end link
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/106 longitudinal with regard to vehicle, e.g. braking
• CPC Class Codes: B60G 2400/204 Vehicle speed
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2400/33 Throttle position
• CPC Class Codes: B60G 2400/39 Brake pedal position
• CPC Class Codes: B60G 2400/41 Steering angle
• CPC Class Codes: B60G 2800/01 Attitude or posture control

Abstract

A vehicle stabilizer system including: (a) a stabilizer bar (28) including (a-1) a torsion bar portion (90), and (a-2) an arm portion (92) that extends from the torsion bar portion in a direction not parallel to the torsion bar portion; (b) an actuator (32) configured to rotate the stabilizer bar about an axis of the torsion bar portion; and (c) a link rod (34) interconnecting the suspension arm (78) and one of opposite ends of the arm portion that is remote from the torsion bar portion. The stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of the torsion bar portion, and which forces the wheel (12) and the body in a selected one of a direction toward each other and a direction away from each other. The actuator allows the stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of the actuator. The link rod is inclined with respect to the suspension arm to which the link rod is connected, such that an angle defined by the link rod and the suspension arm is not 90°.

Claims

1. A stabilizer system for a vehicle including a suspension arm interconnecting a wheel and a body of the vehicle, said stabilizer system comprising:

(a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends from said torsion bar portion in a direction not parallel to said torsion bar portion;

(b) an actuator configured to rotate said stabilizer bar about an axis of said torsion bar portion; and

(c) a link rod interconnecting the suspension arm and one of opposite ends of said arm portion that is remote from said torsion bar portion,

wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body in a selected one of a direction toward each other and a direction away from each other,

wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of said actuator,

and wherein said link rod is inclined with respect to the suspension arm to which said link rod is connected, such that an angle defined by said link rod and the suspension arm is not 90°

, and such that an axial force as a component of the stabilizing force acts on the suspension arm in an understeer-tendency increasing direction that causes at least one of a toe angle and a camber angle of the wheel to be changed in a manner increasing an understeer tendency as a cornering characteristic of the vehicle.

2. The stabilizer system according to claim 1, wherein said angle is not larger than 80°

.

3. The stabilizer system according to claim 1, wherein said angle is not larger than 70°

.

4. The stabilizer system according to claim 1, wherein said angle is not larger than 60°

.

5. The stabilizer system according to claim 1, wherein said stabilizer bar is provided for a front wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the front wheel and the body of the vehicle.

6. The stabilizer system according to claim 5,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a toe-in direction when the stabilizing force forces the front wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a toe-out direction when the stabilizing force forces the front wheel and the body in the direction away from each other,

and wherein the toe angle of the front wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that front and rear portions of the front wheel are displaced inwardly and outwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-in direction, and such that the front and rear portions of the front wheel are displaced outwardly and inwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-out direction.

7. The stabilizer system according to claim 5,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a negative-camber direction when the stabilizing force forces the front wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a positive-camber direction when the stabilizing force forces the front wheel and the body in the direction away from each other,

and wherein the camber angle of the front wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that upper and lower portions of the front wheel are displaced inwardly and outwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the negative-camber direction, and such that the upper and lower portions of the front wheel are displaced outwardly and inwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the positive-camber direction.

8. The stabilizer system according to claim 1, wherein said stabilizer bar is provided for a rear wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the rear wheel and the body of the vehicle.

9. The stabilizer system according to claim 8,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a toe-out direction when the stabilizing force forces the rear wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a toe-in direction when the stabilizing force forces the rear wheel and the body in the direction away from each other,

and wherein the toe angle of the rear wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that front and rear portions of the rear wheel are displaced outwardly and inwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-out direction, and such that the front and rear portions of the rear wheel are displaced inwardly and outwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-in direction.

10. The stabilizer system according to claim 8,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a positive-camber direction when the stabilizing force forces the rear wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a negative-camber direction when the stabilizing force forces the rear wheel and the body in the direction away from each other,

and wherein the camber angle of the rear wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that upper and lower portions of the rear wheel are displaced outwardly and inwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the positive-camber direction, and such that the upper and lower portions of the rear wheel are displaced inwardly and outwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the negative-camber direction.

11. The stabilizer system according to claim 1, comprising:

a pair of stabilizer bars each of which is provided by said stabilizer bar;

a pair of actuators each of which is provided by said actuator; and

a pair of link rods each of which is provided by said link rod,

wherein said pair of link rods are connected to respective suspension arms each of which is provided by the suspension arm and interconnects a corresponding one of right and left wheels as said wheel and the body of the vehicle,

and wherein said torsion bar portion of each of said pair of stabilizer bars is rotated, at one of axially opposite end portions thereof that is remote from said arm portion of said each of said pair of stabilizer bars, by a corresponding one of said pair of actuators.

12. The stabilizer system according to claim 11,

wherein said actuator includes a housing fixed to the body of the vehicle, an electric motor held in said housing, and a speed reducer held in said housing and reducing a speed of motion of said motor while transmitting the motion of said motor to said torsion bar portion of said stabilizer bar,

and wherein said torsion bar portion of said stabilizer bar is connected to an output portion of said speed reducer.

13. The stabilizer system according to claim 12, wherein said speed reducer includes a harmonic gear set.

14. The stabilizer system according to claim 1, comprising a pair of link rods each of which is provided by said link rod, said link rods being connected to respective suspension arms each of which is provided by the suspension arm and interconnects a corresponding one of right and left wheels as said wheel and the body of the vehicle,

wherein said stabilizer bar includes a pair of arm portions each of which is provided by said arm portion,

wherein said pair of arm portions extend from axially opposite ends of said torsion bar portion to the respective link rods,

and wherein said torsion bar portion extends in a lateral direction of the vehicle, and is rotated, at an axially intermediate portion thereof, by said actuator.

15. The stabilizer system according to claim 14,

wherein said actuator includes a housing fixed to the body of the vehicle, an electric motor held in said housing, and a speed reducer held in said housing and reducing a speed of motion of said motor while transmitting the motion of said motor to said torsion bar portion of said stabilizer bar,

and wherein said torsion bar portion of said stabilizer bar is connected, at said axially intermediate portion thereof, to an output portion of said speed reducer.

16. The stabilizer system according to claim 15, wherein said speed reducer includes a harmonic gear set.

17. The stabilizer system according to claim 1, comprising:

a pair of stabilizer bars each of which is provided by said stabilizer bar; and

a pair of link rods each of which is provided by said link rod,

wherein said link rods are connected to respective suspension arms each of which is provided by the suspension arm and interconnects a corresponding one of right and left wheels as said wheel and the body of the vehicle,

wherein said torsion bar portion of one of said pair of stabilizer bars and said torsion bar portion of the other of said pair of stabilizer bars extend in a lateral direction of the vehicle,

wherein said torsion bar portion of said one of said pair of stabilizer bars has an end portion that is remote from said arm portion of said one of said pair of stabilizer bars, while said torsion bar portion of said other of said pair of stabilizer bars has an end portion that is remote from said arm portion of said other of said pair of stabilizer bars, such that the end portions of the torsion bar portions of the respective stabilizer bars are opposed to each other,

and wherein said torsion bar portions of said respective stabilizer bars are rotated, at said end portions thereof, relative to each other by said actuator.

18. The stabilizer system according to claim 17,

wherein said actuator includes a housing, an electric motor held in said housing, and a speed reducer held in said housing and reducing a speed of motion of said motor while transmitting the motion of said motor,

and wherein said torsion bar portion of said one of said pair of stabilizer bars is connected, at said end portion thereof, to said housing, while said torsion bar portion of said other of said pair of stabilizer bars is connected, at said end portion thereof, to an output portion of said speed reducer.

19. The stabilizer system according to claim 18, wherein said speed reducer includes a harmonic gear set.

20. A stabilizer system for a vehicle including a suspension arm interconnecting a wheel and a body of the vehicle, said stabilizer system comprising:

(a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends from said torsion bar portion in a direction not parallel to said torsion bar portion;

(b) an actuator configured to rotate said stabilizer bar about an axis of said torsion bar portion; and

(c) a link rod interconnecting the suspension arm and one of opposite ends of said arm portion that is remote from said torsion bar portion,

wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body in a selected one of a direction toward each other and a direction away from each other,

wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of said actuator,

wherein said link rod is inclined with respect to the suspension arm to which said link rod is connected, such that an angle defined by said link rod and the suspension arm is not 90°

,

wherein said stabilizer bar is provided for a front wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the front wheel and the body of the vehicle,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a toe-in direction when the stabilizing force forces the front wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a toe-out direction when the stabilizing force forces the front wheel and the body in the direction away from each other,

and wherein the toe angle of the front wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that front and rear portions of the front wheel are displaced inwardly and outwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-in direction, and such that the front and rear portions of the front wheel are displaced outwardly and inwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-out direction.

21. A stabilizer system for a vehicle including a suspension arm interconnecting a wheel and a body of the vehicle, said stabilizer system comprising:

(a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends from said torsion bar portion in a direction not parallel to said torsion bar portion;

(b) an actuator configured to rotate said stabilizer bar about an axis of said torsion bar portion; and

(c) a link rod interconnecting the suspension arm and one of opposite ends of said arm portion that is remote from said torsion bar portion,

wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body in a selected one of a direction toward each other and a direction away from each other,

wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of said actuator,

wherein said link rod is inclined with respect to the suspension arm to which said link rod is connected, such that an angle defined by said link rod and the suspension arm is not 90°

,

wherein said stabilizer bar is provided for a front wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the front wheel and the body of the vehicle,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a negative-camber direction when the stabilizing force forces the front wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a positive-camber direction when the stabilizing force forces the front wheel and the body in the direction away from each other,

and wherein the camber angle of the front wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that upper and lower portions of the front wheel are displaced inwardly and outwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the negative-camber direction, and such that the upper and lower portions of the front wheel are displaced outwardly and inwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the positive-camber direction.

22. A stabilizer system for a vehicle including a suspension arm interconnecting a wheel and a body of the vehicle, said stabilizer system comprising:

(a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends from said torsion bar portion in a direction not parallel to said torsion bar portion;

(b) an actuator configured to rotate said stabilizer bar about an axis of said torsion bar portion; and

(c) a link rod interconnecting the suspension arm and one of opposite ends of said arm portion that is remote from said torsion bar portion,

wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body in a selected one of a direction toward each other and a direction away from each other,

wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of said actuator,

wherein said link rod is inclined with respect to the suspension arm to which said link rod is connected, such that an angle defined by said link rod and the suspension arm is not 90°

,

wherein said stabilizer bar is provided for a rear wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the rear wheel and the body of the vehicle,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a toe-out direction when the stabilizing force forces the rear wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a toe-in direction when the stabilizing force forces the rear wheel and the body in the direction away from each other,

and wherein the toe angle of the rear wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that front and rear portions of the rear wheel are displaced outwardly and inwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-out direction, and such that the front and rear portions of the rear wheel are displaced inwardly and outwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the toe-in direction.

23. A stabilizer system for a vehicle including a suspension arm interconnecting a wheel and a body of the vehicle, said stabilizer system comprising:

(a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends from said torsion bar portion in a direction not parallel to said torsion bar portion;

(b) an actuator configured to rotate said stabilizer bar about an axis of said torsion bar portion; and

(c) a link rod interconnecting the suspension arm and one of opposite ends of said arm portion that is remote from said torsion bar portion,

wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body in a selected one of a direction toward each other and a direction away from each other,

wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is changeable by operation of said actuator,

wherein said link rod is inclined with respect to the suspension arm to which said link rod is connected, such that an angle defined by said link rod and the suspension arm is not 90°

,

wherein said stabilizer bar is provided for a rear wheel as said wheel such that the stabilizing force generated by said stabilizer bar forces the rear wheel and the body of the vehicle,

wherein said link rod is inclined with respect to the suspension arm in a direction which causes the axial force to act on the suspension arm in a positive-camber direction when the stabilizing force forces the rear wheel and the body in the direction toward each other, and which causes the axial force to act on the suspension arm in a negative-camber direction when the stabilizing force forces the rear wheel and the body in the direction away from each other,

and wherein the camber angle of the rear wheel is changeable depending on a direction in which the axial force acts on the suspension arm, such that upper and lower portions of the rear wheel are displaced outwardly and inwardly in a lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the positive-camber direction, and such that the upper and lower portions of the rear wheel are displaced inwardly and outwardly in the lateral direction of the vehicle, respectively, when the axial force acts on the suspension arm in the negative-camber direction.