JPS62110507A - Double wishbone type suspension - Google Patents

Abstract

PURPOSE:To tilt a king pin shaft largely and reduce the extent of manual steering effort, by connecting both upper and lower arms to a knuckle supporting a wheel, while forming the upper arm into an A type, and connecting both ends to the knuckle and a car body. CONSTITUTION:An axle 4 is supported on a knuckle 1 through a bearing free of rotation, and a rear wheel 7 is installed on this axle 4. And, a lower arm 9 is connected to a lower end of the knuckle 1 via a ball joint 8, and the lower arm 9 is pivotally supported on a car body B, while a radial slat 11 is installed in position between an intermediate part of the lower arm 9 and the car body B. On the other hand, a rising part 3 extending as far as the upper vicinity of the rear wheel from the knuckle 1 is formed therein, and a broad end part 17 of an A type upper arm 16 is rockably connected to this rising part 3 via a bracket, while a narrow end part 18 of the A type upper arm 16 is pivotally supported on the body B via a ball joint 23. With this constitution, a king pin shaft K is largely tilted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double wishbone suspension.

(Prior Art) A double wishbone type suspension is known in which a seven-shipper arm and a lower arm are connected to a knuckle that supports a wheel.When this is applied to a steered wheel, conventionally, each connection point of an upper arm and a lower arm to the knuckle is connected to the knuckle. The connecting line formed the kingpin axis.

(Problem to be solved by the invention) By the way, when a double wishbone type rear suspension is adopted, the connecting part between the upper arm and the knuckle is moved closer to the rear wheel due to space considerations such as the trunk room. For this reason, it is necessary to place
When the rear wheels are used as steered wheels, the king pin offset becomes positive and the rear wheel steering force increases.

Therefore, an object of the present invention is to greatly incline the kingpin axis to eliminate kingpin offset even when the connection point between the upper arm and the knuckle must be placed close to the top of the wheel due to space constraints. To provide a double wishbone type suspension that can be maintained in a negative or negative state and ensure a reduction in steering force.

(Means for Solving the Problems) Therefore, the present invention connects the shaft grip portion (17) of the A-type upper arm (16) to the knuckle (1), and provides a precise spherical joint portion (
18) was connected to the vehicle body (B).

(Function) Since the kingpin axis (K) is largely inclined, the kingpin offset can be prevented from becoming positive and can be maintained at zero or negative, thereby ensuring reduction in steering force.

(Example) Examples will be described below based on the accompanying drawings.

First of all, this suspension is applied to the rear of a vehicle with front and rear wheel steering.As shown in the drawing, the axle (4) is rotatably supported on the knuckle (1), and the drive shaft (5) is rotatably supported on the knuckle (1).
A rear wheel (7) is mounted on an axle (4) to which power is transmitted from the rear wheel through a constant velocity joint (6). Further, a lower arm (9) is connected to the lower end of the knuckle (1) via a pole joint (8), and the lower arm (9) is pivotally supported on the vehicle body (B).
B) A radius rod (11) is installed between them. Furthermore, a knuckle arm (2) that protrudes rearward is formed at the lower part of the knuckle (1), and a steering tie rod (1) is connected to this knuckle arm (2) via a pole joint (12).
3) are connected.

A raised portion (3) is formed from the knuckle (1) and extends to almost above the rear wheel (7).
) A bracket (14) having front and rear support pieces (15), (15) is bolted to the upper end. The wide end (17) of the A-type upper arm (16) is exposed between the supporting pieces (15) of this bracket (14), and the tubular rubber bushing (21) is interposed between the support pieces (15) and (15). The A-type upper arm (1
Pole join the middle end (18) of 6) (23)
It is pivotally supported to the vehicle body (B) via.

Since the double wishbone type rear suspension is constructed in this way, the line segment connecting the connection point of the lower arm (9) to the knuckle (1) and the connection point of the A-type upper arm (1B) to the vehicle body (B), that is, the pole position The line segment connecting points (8) and (23) is the kingpin axis (K). This kingpin axis (K) is highly inclined as shown in the figure, and the kingpin offset is always maintained at zero or negative. , the steering force required to steer the rear wheels (7) can be made lighter than in the case of positive steering.

Note that this structure can also be adopted for a front suspension, and does not necessarily have to be a rear-wheel drive system.

(Effects of the Invention) As described above, according to the present invention, it is possible to maintain the kingpin offset at zero or negative by greatly inclining the kingpin axis, and to ensure reduction of steering force, especially when steering the front and rear wheels. It is effective as a rear suspension for cars.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an unsuspended device, and FIG. 2 is a partially cutaway rear view. In addition, in the drawing, (1) is the cheek 2, (3) is the upright part, (
7) is the rear wheel, (9) is the lower arm, (11) is the radius rod, (+3) is the tie rod, (16) is the A type upper arm, (B) is the vehicle body, and (K) is the king pin shaft.

Claims (1)

[Scope of Claims] An upper arm and a lower arm are connected to a knuckle that supports a wheel, the upper arm is formed into an A shape, a shaft joint portion of the A-shaped upper arm is connected to the knuckle, and a spherical joint portion is connected to the vehicle body. Double wishbone suspension.