JPH0747827A - Rear suspension used for automobile - Google Patents

Abstract

PURPOSE:To improve maneuvering stability of an automobile by stabilizing its running while it is turning on a rough road, or receiving external disturbance such as lateral wind. CONSTITUTION:A pair of upper torque rods 11, 12 are disposed ahead of the axis 37 of a rear axle 33 with their instantaneous center C located behind the axis 37 of the rear axle 33. A pair of lower torque rods 13, 14 are disposed parallel to each other, ahead of the axis 37 of the rear axle 33 and outside the pair of upper torque rods 11, 12.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to rear suspensions used in motor vehicles.

[0002]

BACKGROUND ART Axle suspension methods are mainly used for the rear suspension of large vehicles such as buses and trucks. Then, the suspension method is such that the chassis is positioned in a V-shape at an appropriate interval in the lateral direction of the chassis at an inclination that positions the instantaneous center in front of the rear axle axis, and the chassis is positioned in front of the rear axle axis. Since it includes a pair of torque rods that are connected between the side and its rear axle side,
When turning, lateral forces tend to oversteer the vehicle and make it unstable.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to stabilize driving when a vehicle using an axle type axle turns, and when it receives a disturbance such as bumpy road or side wind on the road surface, and improves steering stability. The purpose is to provide the rear suspension used for the automobile.

[0004]

[Means corresponding to the problem and its action]
A pair of upper torque rods are tilted so that their instantaneous centers are located posterior to the rear axle axis at an appropriate interval in the lateral direction of the chassis at appropriate intervals in front of the rear axle axis and its chassis side and its rear side. A pair of lower torque rods connected to the axle side and a pair of upper torques in the lateral direction of the chassis
Outside the rod, parallel to each other in the lateral direction of the chassis at appropriate intervals, connected between the chassis side and the rear axle side in front of the axis of the rear axle, and when turning, It is also where the rear axle undergoes compliance understeering when it is subject to disturbances such as bumpy roads or side winds.

[0005]

DESCRIPTION OF SPECIFIC EXAMPLES Specific specified examples of the rear suspension used in the automobile of the present invention will be described with reference to the drawings. 1 and 2 schematically show an embodiment 10 of a rear suspension used in a motor vehicle according to the invention as applied to a rear engine bus 30. This rear suspension 10 includes axle tubes 34, 3 of the rear axles 33, 33.
Left and right rear springs (not shown) for supporting the chassis 4 on the chassis 31, a pair of upper torque rods 11,
12 and a pair of lower torque rods 13 and 14, and the rear axles 33 and 33, of course,
Fixedly support drive wheels (not shown) at both ends, and
The left and right rear springs are normally connected to the chassis 31 at intervals in the lateral direction of the chassis 31. Of course, in this rear engine bus 30, air bellows, coil springs, etc. are used for the left and right rear springs, and the number thereof is appropriately selected.

The pair of upper torque rods 11,
12 is an imaginary axis line 27, 28 extending rearward on the axis line.
At the moment center C which is the intersection point of the rear axle 33,3
The rear axle 33, at an appropriate interval in the lateral direction of the chassis 31, with an inclination that is located rearward of the axis 37 of
The chassis 3 in front of the axes 37 of 37
The first side and the rear axles 33, 33 are connected in a substantially horizontal state. Also, for specific mounting,
The front ends of the upper torque rods 11 and 12 are connected to the brackets (not shown) of the frames 32 and 32 at the chassis 31 with the rubber bush 21 interposed by the pins 19 while the rear ends thereof are at the final deceleration speed. Between the chassis 31 side and the rear axle 33, 33 side of the device 35, which is connected to a bracket (not shown) arranged above the differential case 36 with a rubber bush 22 interposed by a pin 20. Is located in. Of course, the upper torque rods 11 and 12 fit the pins 19 and 20 into the bosses 15 and 16 of the both rod ends, respectively, with the rubber bushes 21 and 22 interposed therebetween, and the upper and lower torque rods 11 and 12 are attached to the brackets. The pins 19 and 20 are connected by bolting.

Particularly, in this rear suspension 10, the center C at that moment is the rear engine bus 30.
It depends on the rear
30 behind the axes 37, 37 of the axles 33, 33
It is set in the range of up to 1500 mm.

The pair of lower torque rods 13, 1
Reference numeral 4 denotes the chassis 31 outside the pair of upper torque rods 11 and 12 in the lateral direction of the chassis 31.
Of the rear axles 33, 33 parallel to each other at an appropriate interval in the lateral direction of the rear axle, and appropriately lower than the pair of upper torque rods 11, 12 and in front of the axes 37, 37 of the rear axles 33, 33. The chassis 31 side and the rear axles 33, 33 side are connected in a substantially horizontal state. For specific mounting, see the lower
The torque rods 13 and 14 have their frame 3 at the front end.
2, 32 brackets (not shown) are connected by a pin 23 with a rubber bush 25 interposed, while the rear end of the axle tubes 34, 34 is connected to a bracket (not shown) by a pin 24 with a rubber bush. The pair of upper torque rods 11 and 12 are connected by interposing a bush 26 therebetween.
Below the chassis 31 side and its rear axle 33,
It is arranged between the 33 side. Of course, the lower torque
The rods 13 and 14 are the above-mentioned upper torque rod 1
Bosses 17 and 18 on both rod ends, similar to 1 and 12
The pins 23 and 24 are fitted to the brackets with the rubber bushes 25 and 26 interposed therebetween, and the pins 23 and 24 are connected to both brackets by bolting. In particular, in this case, the brackets extend downwardly from the frames 32, 32 and axle tubes 34, 34 and are fixedly attached to the frames 32, 32 and axle tubes 34, 34, and between the bracket tips. In other words, the lower torque rods 13 and 14 are connected between the lower ends of the brackets.

Next, the operation of the rear suspension 10 will be described in relation to the traveling of the rear engine bus 30. When the rear engine bus 30 is turned to the right, the pair of upper torque rods 1
1, 12 are the generated lateral force F, as shown in FIG.
The rubber bushes 21 and 22 are deflected by the steering wheel in the same direction as the front axle about the instantaneous center C, acting on the rear axles 33 and 33, and at the same time, lowering the lower torque. The rods 13 and 14 act on the rear axles 33 and 33 where the generated lateral force F causes the rubber bushes 25 and 26 to flex and steer the front axles in the opposite direction. And in this case,
Reverse steering of the rear axles 33, 33 by the pair of lower torque rods 13, 14 causes the rear steering of the rear axles 33, 33 by the pair of upper torque rods 11, 12.
The rear axles 33, 33 are steered in the opposite direction by their front axles because they overcome the same direction steer of the axles 33, 33. That is, compliance understeer is generated in the rear axles 33, 33, and as a result, the rear engine bus 30
Is a smooth and quick transition to a turn, and its rear
The engine bus 30 has enhanced steering stability due to its compliance understeer.

Also, when the rear engine bus 30 travels due to disturbances such as bumps and side winds on the road surface, the compliance under steer is applied to the rear axles 33, 33 as in the case described above. When the rear engine bus 30 is generated, spin is avoided and traveling is stabilized.

As will be apparent from the specific embodiments of the invention described above with reference to the drawings, those of ordinary skill in the art to which the invention pertains have the subject matter of the invention. Is the nature of the invention (na
It is easily embodied in other embodiments that are derived from the true) and substance and that are objectively recognized as having them internalized. Of course, the contents of the present invention are essential to the establishment of the invention in accordance with the problems of the invention.

[0012]

Benefits of the Invention As will be understood from the above, the rear suspension used in the motor vehicle of the present invention has a tilt in which the pair of upper torque rods have their instant centers centered behind the rear axle axis. At a suitable distance in the lateral direction of the chassis in front of the axis of the rear axle, between the chassis side and the rear axle side, and a pair of lower torque rods is connected to the side of the chassis. Between the chassis side and the rear axle side in front of the axis of the rear axle, parallel to each other outside the pair of upper torque rods in the lateral direction of the chassis at appropriate intervals. Because it is connected, the rear suspension used in the automobile of this invention is used when turning and when receiving disturbances such as bumps and side winds on the road surface. , Compliance under steer is generated in the rear axle, the vehicle shifts smoothly and swiftly to turning to improve steering stability, and spin is avoided to improve running stability, as a result, It is very useful and practical for automobiles, especially large automobiles.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a specific example of a rear suspension used in a vehicle of the present invention applied to a rear axle of a rear engine bus.

2 is a schematic front view of the rear suspension shown in FIG. 1. FIG.

[Explanation of symbols]

 11 Upper Torque Rod 12 Upper Torque Rod 13 Lower Torque Rod 14 Lower Torque Rod

Claims (1)

[Claims] 1. A pair of upper torque rods are provided in front of the rear axle axis at appropriate intervals in the lateral direction of the chassis with an inclination that positions the instantaneous center rearward of the rear axle axis. Connected between the chassis side and its rear axle side, and a pair of lower torque rods laterally of the chassis and outside the pair of upper torque rods in the lateral direction of the chassis as appropriate. A rear suspension used in a vehicle that is parallel to each other at a distance and is connected between the chassis side and the rear axle side in front of the rear axle axis.