JPH06143954A - Front suspension used for automobile - Google Patents

Abstract

PURPOSE:To improve controllability and stability by arranging a lateral rod, one end of which is connected to the frame and the other end or which is connected to a front axle between right and left leaf springs. CONSTITUTION:When a truck is turned leftward, a lateral force acts in the axial direction of a front axle 53 to generate a moment due to the lateral force around a connection P between a lateral rod 15 and the front axle 53 and thus generate an angle of slideslip at the front wheel in the direction of reducing lateral oscillation of the frame. As a result, controllability and stability were improved. Further, when the truck is subject to disturbance during running, a moment due to the lateral force acting in the axial direction of the front axle 53 is generated, as in the case of turning, around the connection P between the lateral rod 15 and the front axle 53 to produce an angle of slideslip at the front wheel in the direction of reducing the lateral oscillation of the frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front suspension used in an automobile, particularly an axle type front suspension.
Regarding suspension.

[0002]

BACKGROUND ART Generally, in an axle-type front suspension used in an automobile, a lateral rod makes an axis line parallel to an axis line of a front axle.
It was located just above the axle, and was used by connecting one end to the frame and the other end to its front axle, so that the lateral
The rod draws an arc locus to cause lateral slip between the sprung and unsprung parts, and when the vehicle turns or is subjected to disturbance, the lateral force deviates from the axis and acts on the front axle. A moment is generated around the connection between the lateral rod and the front axle by the moment, and the moment always acts in the direction of increasing the lateral swing of the vehicle body, so the maneuverability and stability of the vehicle Was affected.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a front suspension used in a vehicle for improving the maneuverability / stability when the vehicle turns, receives disturbances, and when the front wheels move up and down. Is provided.

[0004]

[Means corresponding to the problem and its action]
Left and right leaf springs that are placed between the frame and the front axle at a predetermined distance, and outside the left and right leaf springs, the frame and front
The left and right air springs located between the axles and the axis are displaced parallel to the front axle axis when displaced from the front of the front axle when viewed from the side of the vehicle, and the left and right It includes a lateral rod connecting one end to its frame and the other end to its front axle between the leaf springs, and to the front of the front axle axis when the vehicle turns or is subject to disturbances. A lateral slip angle is generated in the direction that reduces the lateral swing of the vehicle body by generating a moment due to lateral force around the connection point between the lateral rod that is displaced and its front axle, and the front wheel When moving up and down, the lateral displacement between the sprung part and the unsprung part is reduced.

[0005]

DESCRIPTION OF SPECIFIC EXAMPLES Specific specified examples of the front suspension used in the automobile of the present invention will be described with reference to the drawings. 1 and 2 schematically show a specific example 10 of a front suspension used in a vehicle of the present invention applied to a heavy truck 50. The front suspension 10 is assembled with left and right leaf springs 11 and 12, left and right air springs 13 and 14, a lateral rod 15, and left and right shock absorbers (not shown).
Then, in the truck 50, it was arranged between the frame 31 and the front axle 53 and used for suspension of the vehicle body.

The leaf springs 11 and 12 are located laterally at a predetermined interval between the frame 51 and the front axle 53 when viewed from the front of the vehicle body, and the eye 16 at the front end fixes the pin 19. The eye 17 at the rear end is connected to the other bracket 21 of the frame 51 via the shackle 22. Of course, between the eye 16 at the front end and the pin 19 thereof, a rubber bush 20 with a metal inner / outer tube is interposed, and at the rear end of the eye 17, the shackle 22 via another pin 23. Was linked to. Then, a rubber bush 24 with another metal inner / outer cylinder is interposed between the eye 17 at the rear end and the other pin 23, and the shackle 22 further has another pin 25 and the bracket 21 thereof. Was linked to. Also in this case, the shackle 22 and the pin 25
Further, another rubber bush 26 with a metal inner / outer tube is interposed between the above and the other.

The air springs 13 and 14 are arranged outside the left and right leaf springs 11 and 12 via the brackets 32 and 33 between the frame 51 and the front axle 53, and the air is supplied to the pipe 31. The left and right leaf springs 11, 1 where compressed air is supplied and discharged by a leveling valve 27 which is connected to a tank (not shown) and arranged in the middle of the pipe 31.
Used in combination with 2. Of course, the leveling
The valve 27 has a built-in piston (not shown) moved by a lever 28 to close the exhaust port and connect the tank port to the bellows port, and also close the tank port to connect the bellows port. Manufactured in conventional construction to communicate with its exhaust port, and in its frame 51, attached to a sub-frame 52 whose lever 28 is link coupled to its front axle 53 via link 29 and arm 30. Was done.

Also, one of the brackets 32 and 33 is 3
2 is manufactured in a one-arm construction with a support arm 34 which provides a spring seat 35 for its air spring 13 and is clamped to its front axle 53 together with its leaf spring 11 with U-bolts and nuts. On the one hand, the other side 33 of the brackets 32, 33
Has a spring seat 3 on its air spring 14.
Support arm 36 to provide 7 and its lateral rod 1
5 is manufactured in a two-arm structure with an off-set arm 38 connecting the front spring 53 to its front axle 53 and other leaf springs 1 with U-bolts and nuts.
Tightened to the front axle 53 with the 2.

The axial rod 39 of the lateral rod 15 is displaced in front of the axial line 54 of the front axle 53 of the front axle 53 when viewed from the side of the vehicle body.
Is positioned parallel to the axis 54 of the frame 51, and one end between the left and right leaf springs 11 and 12 is connected to the frame 51.
The other end was connected to the front axle 53, respectively. More specifically, the lateral rod 15
Has one end connected to the bracket 40 of the sub-frame 52 via a pin 41, and the other end connected to the off-set arm 38 of the bracket 33 via a pin 42. Further, in this case, the off-set amount L by which the lateral rod 15 is displaced to the front side of the front axle 53 is appropriately set within the range of 50 to 300 mm. And the optimum off-set amount is 150
The range was up to 200 mm.

The left and right shock absorbers are normally connected between the frame 51 and the front axle 53 by pivotally connecting both ends to the frame 51 and the front axle 53 outside the left and right leaf springs 11, 12. Was placed.

Next, the operation of the front suspension 10 constructed as described above will be described with reference to the running of the truck 50. Now, when the truck 50 is turned to the left, a lateral force acts in the axial direction of the front axle 53, so that the lateral force acts around the connection point P between the lateral rod 15 and the front axle 53. Generates a moment to produce a side slip angle on the front wheels in a direction to reduce the lateral swing of the vehicle body, and as a result, the maneuverability and stability of the truck 50 are improved.

Further, when the truck 50 is subjected to disturbance during traveling, similarly to the case of the turning described above, the moment due to the lateral force acting in the axial direction of the front axle 53 is applied to the lateral rod 15 thereof. Is generated around the connection point P between the front axle 53 and the front axle 53 and causes a side slip angle in the front wheel in a direction that reduces the lateral swing of the vehicle body, that is, by rolling of the vehicle body The front wheels have a side slip angle in a direction that reduces the axle steer due to the resulting lateral offset, which results in improved maneuverability and stability for the truck 50.

Further, when the front wheel on one side is moved up and down by bumps on the road surface while the truck 50 is running, the lateral movement of the unsprung portion as viewed from the front of the vehicle body is caused by the lateral rod 15 and its front. Connection point P with axle 53
Laterally oscillating the lateral rod 15 around it, the lateral oscillating of the lateral rod 15 causes a side slip angle in the front wheels in a direction that reduces the lateral oscillating of the vehicle body when it is actuated. As a result, maneuverability and stability were improved.

As is apparent from the embodiments of the present invention described above with reference to the drawings, those having ordinary skill in the art to which the present invention pertains have the following contents of the present invention. In order to achieve the object of the invention, it is easy to obtain a mode that is derived from the technical essence of the invention, which is essential for the formation of the invention and is the nature of the invention, and which is objectively recognized as being inherent. Is embodied in.

[0015]

Benefits of the Invention As will be understood from the above, the front suspension used in the automobile of the present invention has left and right leaf springs arranged between the frame and the front axle at predetermined intervals, and left and right leaf springs. Leaf
Left and right air springs located outside the spring between the frame and the front axle, and parallel to the front axle axis as the axis is displaced forward of the front axle axis when viewed from the side of the vehicle. In the lateral, which is located at, and connects one end to the frame between the left and right leaf springs and the other end to the front axle, when the vehicle turns or is subjected to disturbance, the front axle A moment due to a lateral force is generated around the connection point between the lateral rod that is displaced to the front side of the axis and the front axle, causing a side slip angle in the front wheel in a direction that reduces the degree of rolling of the vehicle body, and , When the front wheel moves up and down, around the connection point between the lateral rod and the front axle. As the lateral rod is horizontal swinging and maneuverability, stability cause sideslip angle is improved in that the front wheel in the direction of reducing the lateral swinging of the vehicle body,
The soft leaf spring and air spring can be used in combination to reduce vibration and improve riding comfort, resulting in a very useful and practical vehicle for connecting left and right front wheels with an axle. Target.

[Brief description of drawings]

FIG. 1 is a front view of a front suspension seen from the front of a vehicle body with a part omitted in a specific example of a front suspension used for an automobile of the present invention applied to a heavy-duty truck.

FIG. 2 is a partial perspective view of the front suspension shown in FIG. 1 as viewed from the rear.

[Explanation of symbols]

 11 Leaf Spring 12 Leaf Spring 13 Air Spring 14 Air Spring 15 Lateral Rod 53 Front Axle

Claims (1)

[Claims] 1. A frame and a front frame at predetermined intervals.
Left and right leaf springs placed between the axles,
The left and right air springs, which are located outside the left and right leaf springs and between the frame and the front axle, and the axis is displaced forward of the front axle axis when viewed from the side of the vehicle body, A front suspension used in an automobile that is positioned parallel to the axis of the axle and includes between its left and right leaf springs one end to its frame and the other end to its front axle. .