JPS6331807A - Suspension device for automobile - Google Patents

Abstract

PURPOSE:To reduce the occurrence of reaction separating each rod in a double- wishbone type device having a double damper spring by locating the axial line of the damper in alignment with the axial line of each rod for a lower arm when viewed from top. CONSTITUTION:A bracket 5 fixed to a body frame 4 is connected with both ends of an upper arm 6 and another end thereof is connected to the upper end of a knuckle 8 via a ball joint 7. Also, each foot of two rods 3a forming a lower arm 3 is connected to the body frame 4 and the tips thereof are jointed to each other via a joint member 9 for connection to the lower end of the knuckle 8. In this case, the upper end of a damper 1 is fixed to a support member 4a projected sideward from the body frame 4 via a bracket 15 and the lower end thereof is fixed to the center of the lower arm 3 via a bracket. And the damper 1 is so located that the axial line thereof will agree to the axial line of the lower arm 3 when viewed from top.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a suspension device for an automobile, and more specifically, a double wishbone type suspension device equipped with a double damper spring, in which a lower arm is formed. The present invention relates to an automobile suspension device that reduces the reaction force of a damper that acts to separate rods.

[Prior art]

An example of a double wishbone type suspension system that is mainly used as an independent suspension system for the front wheels of passenger cars is disclosed in Japanese Utility Model Application Publication No. 58-9806. This suspension system consists of an upper arm, a lower arm, a damper, a spring, etc. The base ends of the upper arm and lower arm are pivoted to the vehicle body, and the tip ends of the knuckle to which the front wheel axle is attached via a ball joint. A damper and a spring are interposed between the lower arm and the vehicle body.

Incidentally, rally cars and the like that require a high degree of durability are forced to run under severe conditions, so the suspension system is required to have sufficient strength. Therefore, a so-called double damper spring type is often adopted, in which two sets of damper springs are attached to each of the above-mentioned double life spon suspension devices. In this system, the lower arm, which is supported by a damper and a spring, is composed of two rods that are joined at their tips and connected to the knuckle via a ball joint, and a pair of dampers are connected between each rod and the vehicle body. The spring is tensioned.

[Problem that the invention seeks to solve]

In the double damper spring type suspension device as described above, the axis of the damper 1 shown in FIG. It is located. Therefore, when the wheel swings, the reaction force P acting on both rods 3a and 3b constituting the lower arm 3, along with the component force P1 along the rod axis, acts on both rods 3a and 3b in a plane including the rod axis. A component force P2 in a direction that separates the joint is also generated. This component force P2 becomes quite large during bumping, etc., and applies an excessive load to the joint 9 of the rods 3a and 3b. Therefore, under severe running conditions, the joint portion 9 may be deformed or damaged. Therefore, the joint portion 9 needed to have a strong structure.

However, this joint portion 9 is a portion that adds to the so-called unsprung weight, and is particularly desired to be lightweight and compact in order to improve riding comfort. However, in the conventional double damper spring type suspension device, as described above, a force is generated that separates the joint between the rods 3a and 3b, so it is not easy to reduce the weight of the joint 9. It wasn't.

The present invention was made in consideration of such circumstances, and
It is an object of the present invention to provide a double damper spring type suspension device that reduces the generation of reaction force of a damper 1 that acts to separate both joined lofts 3a and 3b.

[Means for solving problems]

The means of the present invention for solving the above object is a double wishbone type automobile in which the tips of two rods are joined to form a lower arm, and each rod is equipped with a pair of dampers and springs. In the suspension device, each damper is arranged so that its axial center line substantially coincides with the axial center line of the rod when viewed from above.

[For production]

The reaction force exerted on the rod by the damper, which is arranged to approximately coincide with the axis of the rod when viewed from above, is generated in a direction approximately along the rod axis in a plane that includes the axis of the rod.
The generation of force components directed outward perpendicular to the axis of the rod is minimal. Therefore, even when the wheel swings significantly, such as during a bump, the generation of a force that would cause the two rods to separate from each other is suppressed.

〔Effect of the invention〕

The automobile suspension device of the present invention is a double damper spring type double wishbone suspension device, and each damper axis is arranged so that the axis line of each damper substantially coincides with the axis line of the lower arm when viewed from above. Therefore, the reaction force of the damper acts along the axis of the lower arm, and the generation of a force that would separate the joint between the two lower arms is suppressed.

〔Example〕

The present invention will be described in detail below based on examples thereof.

The automobile suspension system of this embodiment is a highly durable front wheel independent suspension system used in rally cars, etc., and is equipped with two sets of dampers 1 and springs 2, as shown in FIG. It is a double damper spring type double wishbone suspension device.

As shown in FIG. 3, each of the dampers 1 is arranged so that its axial center line substantially coincides with the axial center line of the lower arm 3 when viewed in plan.

Both ends of an upper arm 6 are pivotally connected to a bracket 5 fixed to a frame 4 disposed in the longitudinal direction of the vehicle body, and the other end is connected to the upper end of a knuckle 8 via a ball joint 7. The lower arm 3 is composed of two rods 3a and 3b, each of which has its base end pivotally attached to a bracket (not shown) fixed to the frame 4, and whose distal end is connected to a joining member 9 (
(see FIG. 3), and is connected to the lower end of the knuckle 8 via a ball joint (not shown). A front wheel shaft 12 that rotatably supports a front wheel mounted on a drum 10 is attached to the naphicle 8, and a steering receiving arm 13 for steering operation is protruded from the upper side of the shaft, and its tip end A drag link 14 is attached to transmit the operating force from the handle.

The upper end of the damper 1 is pivoted to a bracket 15 fixed to a support member 4a projecting laterally from the frame 4, and the lower end thereof is fixed to approximately the center of the lower arm 3, as shown in FIG. As described above, each damper 1 is arranged such that its axial center line approximately coincides with the axial center line of the lower arm 3 in plan view.

A spring 2 is interposed between a member 1b of the receiver provided at the upper end of the cylinder 1a of the damper 1 and a presser member 1d attached to the upper end of the piston rod IC, so that the front wheel 11 is independently elastic. The project is supported.

The automobile suspension device configured in this way is
As shown in FIG. 3, a rod 3a.

The reaction force F that 3b receives from the damper 1 acts almost along the axial direction of the rods 3a and 3b in the plane that includes the rod axis, and the component force F1 in the axial direction is large, and the reaction force F acts outward perpendicularly to the axis. The directed component force F2 becomes very small. As mentioned above, as shown in FIGS. 1 and 3, the distance between the upper ends of both dampers 1 is made wider than the conventional one shown in FIG. 1 to the rod 3. This is because both dampers 1 are arranged so as to be inclined so as to substantially coincide with the axial direction of the dampers a and 3b.

Therefore, according to the automobile suspension device of this embodiment, the force directed in the direction of separating the rods 3a and 3b is reduced, so less strength is required for the joining member 9, and the weight of that part can be reduced. The unsprung weight can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of an automobile suspension device according to an embodiment of the present invention, FIG. 2 is a perspective view of the main parts, FIG. 3 is a schematic diagram explaining the operation, and FIG. 4 is an explanation of the operation of a conventional example. It is a schematic diagram. 1--damper, 2--spring, 3--lower arm, 3a, 3b...-rod. Patent applicant Mazda Co., Ltd. Agent Patent attorney Katsutoshi Yoshiso (and 1 other person) Figure 2 Figure 4

Claims (1)

[Claims] (1) In a double wishbone automobile suspension system, in which the tips of two rods are joined to form a lower arm, and a pair of dampers and springs are attached to each rod, each damper is A suspension device for an automobile, characterized in that the axial center line of the rod is arranged so as to substantially coincide with the axial center line of the rod.