JPH045587B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rear wheel steering device for a vehicle equipped with a three-link trailing arm type rear suspension.

(Prior Art) Vehicles are often equipped with front and rear wheel steering devices that enable front and rear wheels to be steered.Generally, functional parts for rear wheel steering, such as a knuckle arm and tie rod, are installed in the rear suspension functional parts. It was added.

On the other hand, there is a trailing arm that is pivotally supported by a pivot shaft placed approximately in the lateral direction of the vehicle body and rotatably supports the rear wheel at the rear end side, and a trailing arm that is connected to the trailing arm at one end and is placed approximately in the lateral direction of the vehicle body. A rear suspension consisting of three links is known, and this is called a three-link trailing arm type rear suspension.

(Problems to be solved by the invention) As mentioned above, in order to make the rear wheels steerable, conventionally,
In addition to the rear suspension functional parts, functional parts for rear wheel steering, such as a knuckle arm and tie rod, which are almost the same as the front wheel steering mechanism, are required, leading to an increase in the number of parts for the rear suspension.

Therefore, an object of the present invention is to focus on the three-link trailing arm type rear suspension, and to make one of the suspension links double as a tie rod for steering the rear wheels, and the trailing arm also doubles as a knuckle arm. To provide a rear wheel steering device for a vehicle, which can rationally realize rear wheel steering without increasing the number of rear suspension parts.

(Means for Solving the Problems) In order to solve the above problems and achieve the objects, the present invention provides a trailing arm 21 that rotatably supports the rear wheel 39 on the rear end side, and a trailing arm 21 that rotatably supports the rear wheel 39 on the rear end side. In a vehicle equipped with a rear suspension consisting of three links 31, 32, and 33 connected to the vehicle body and arranged substantially in the lateral direction of the vehicle body, the trailing arm 21 is a rocking member that is swingably supported by the vehicle body. The movable arm 45 allows movement in the lateral direction of the vehicle and is pivoted, and the three links 31,
Ball joints 34, 35, at one end of 2, 33,
36, and the three links 31, 3
2, 33, the other ends of which are supported by the vehicle body via rubber bushes 52, 53, and the other end of the remaining one is jointly connected to a rear wheel steering connecting shaft. do.

(Function) In the 3-link trailing arm type rear suspension, the trailing arm 21 is pivotally supported by a swinging arm 45 to allow movement in the lateral direction of the vehicle body.
On the other hand, two of the three links 31, 32, 33 connected via ball joints 34, 35, 36 are connected to the vehicle body via rubber bushes 52, 53, and the other end of the remaining one is connected to the vehicle body via rubber bushes 52, 53. Since the link 31 is jointly connected to the connecting shaft for rear wheel steering, this link 31 also functions as a tie rod for rear wheel steering, and the trailing arm 21 is swung laterally using the pivot as a fulcrum. The rear wheel 39 can be steered by functioning like a knuckle arm.

In particular, since the trailing arm 21 is pivotally supported by the swinging arm 45 and the links 31, 32, 33 are connected by ball joints 34, 35, 36, movement in the lateral direction of the vehicle is easy and steering is possible. In addition, the link used as a tie rod is jointly connected to the rear wheel steering connection shaft, so the link length is always constant, so it can function as a suspension regardless of the steering condition. It is possible to secure sufficient amounts.

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

FIG. 1 is a perspective view of the front and rear wheel steering system. A steering shaft 2 of a steering wheel 1 is incorporated into a rack and pinion type front steering gear box 4 via a universal joint 3, and tie rods 6 are attached to both ends of the rack shaft 5. , 6 are connected to each other, and knuckle arms 8, 8 for supporting front wheels 7, 7 are connected to the tie rods 6, 6.

A pinion shaft 9 that engages with a easy shaft 5 projects rearward from the front steering gear box 4, and a universal joint 1 is attached to the pinion shaft 9.
1, a pinion shaft 14 is connected to the linkage shaft 12 through a universal joint 13, and the pinion shaft 14 is assembled into a rear steering gear box 15.

On the other hand, the rear suspension is as shown in Fig. 2, and the trailing arm 21 is press-molded and has a reinforcing plate 23 joined to the open surface of the plate 22 with the plate surface oriented vertically, and a nutcle 25 is bolted to the rear. The trailing arm 21 forms a rigid body integrally connected at 26, 26, and a rubber bushing 27 with a tube is fixed to the front portion of the trailing arm 21, which is disposed approximately in the lateral direction of the vehicle body.

The trailing arm 21 has three lateral links 31, 3 arranged approximately in the lateral direction of the vehicle body.
2 and 33 are connected respectively.

That is, the outer end of the first lateral link 31 is connected to the front end of the extension part 24 in front of the tube-equipped rubber bush 27 of the trailing arm 21 with a ball joint 34, and the outer end of the first lateral link 31 is connected to the front upper end of the knuckle 25 at the rear of the trailing arm 21. The outer ends of the second lateral link 32 and the third lateral link 33 are connected to the lower rear part by ball joints 35 and 36, respectively.

Further, the nutcle 25 rotatably supports an axle 38 that is interlocked with a drive shaft 37.
The rear wheel 3 is mounted on the axle 38 that protrudes outward from the wheel 5.
9 is mounted, and further, the lower end of the damper 41 is connected to the outer end of the third lateral link 33 via the bifurcated portion 42 by a support shaft 43. The drive shaft 37 is disposed through the bifurcated portion 42 .

A pivot shaft 28 inserted into a rubber bushing with a tube 27 fixed to the front of the trailing arm 21 is supported by a holder 45 forming a swinging arm.

The holder 45 is formed by connecting the upper parts of left and right hanging pieces 46, 46 with cylindrical parts 47, 47 formed concentrically in the front and back, and rubber bushings with tubes 48, 48 are fixed in both cylindrical parts 47, 47. do.

A rubber bushing 27 provided on the trailing arm 21 faces between both hanging pieces 46, 46 of the holder 45, and is supported by a pivot shaft 28.

For assembly to the vehicle body, the inner ends of the second and third lateral links 32 and 33 are attached to rubber bushings 52 and 5 with tubes.
3 to the vehicle body, and furthermore, a holder 4.
5 is penetrated into tube-equipped rubber bushes 48, 48 provided in both cylindrical parts 47, 47, and is pivotally supported via a pivot shaft (not shown) disposed approximately in the longitudinal direction of the vehicle body. This is done by connecting to.

Both first lateral links 31, 3 are connected to the front end portions of the left and right trailing arms 21, 21.
1 to the rear steering gear box 1.
5, and the pinion shaft 1 is installed in the gear box.
Links 31, 31 are connected to both ends of a rear wheel steering connecting shaft by a rack shaft (not shown) that meshes with 4 through a joint.

Here, the pivot shaft 28 of the trailing arm 21
is supported by a holder 45, and the holder 45 is pivoted to the vehicle body by a pivot shaft disposed approximately in the longitudinal direction of the vehicle body. Since it is supported by ints 34, 35, and 36,
When the rear wheel 39 bounds or rebounds, the trailing arm 21 moves in the lateral direction of the vehicle body due to the swinging of the lateral links 31, 32, 33. This becomes easier by moving the pivot point of the

In this way, in the three-link trailing arm type rear suspension, one link, that is, in the embodiment, the first lateral link 31 connected to the extension portion 24 in front of the pivot portion of the trailing arm 21 is connected to the rear steering gear. Since it is incorporated into the box 15, the first lateral link 31 can be moved laterally by operating the handle 1, and thereby the trailing arm 21 can be swung laterally in plan view using the pivot point behind it as a fulcrum. The rear wheels 39 can be steered together with the front wheels 7.

Since the first lateral link 31 is jointly connected to the rear wheel steering connecting shaft, the link length is always constant, and therefore, the function as a suspension can be sufficiently ensured regardless of the steering state. It is becoming.

Moreover, since the first lateral link 31 functions as a tie rod for rear wheel steering, and the trailing arm 21 also functions as a knuckle arm, dual-purpose functional parts can be realized without increasing the number of rear suspension parts. Steering of the rear wheels 39 can be achieved rationally.

In the embodiment, the second lateral link 32 and the third lateral link 33 are connected to the trailing arm 21.
In other words, since they are connected to the nutcle 25 by ball joints 35 and 36, the line connecting the upper and lower ball joints 35 and 36 forms the kingpin axis K, and this kingpin axis K Since the first lateral link 31 located farthest from the steering wheel is used as the steering tie rod,
Since the lever ratio can be increased, gearbox 1
5. The tie rod link 31 can be manufactured without requiring very high dimensional accuracy.

Incidentally, although the above embodiments have been explained based on a rear-wheel drive vehicle, if the vehicle is not a rear-wheel drive vehicle as shown in FIG. , a rear wheel 39 is rotatably attached to this axle 29, and the other configurations are the same as in FIG.

Note that it is also possible to make the second lateral link 32 and the third lateral link 33 function as tie rods for steering the rear wheels.

(Effects of the Invention) As described above, according to the present invention, in a vehicle equipped with a three-link trailing arm type rear suspension, the trailing arm is pivotally supported by a swinging arm to allow movement in the lateral direction of the vehicle body. On the other hand, two of the three links connected via ball joints are connected to the vehicle body via rubber bushings,
Since the other end of the remaining one is jointed to the rear wheel steering connecting shaft, the link can function as a tie rod for rear wheel steering, and the trailing arm can function as a knuckle arm, resulting in an increase in rear suspension parts. This makes it possible to realize dual-use functional parts and rationally achieve rear wheel steering without any problems.

In particular, the trailing arm is pivotally supported by a swing arm and the links are connected by a ball joint, making it easy to move laterally and steer the vehicle, and it can also be used as a tie rod. Since the link is jointly connected to the rear wheel steering connecting shaft, the link length is always constant, and therefore, the suspension function can be sufficiently ensured regardless of the steering state.

[Brief explanation of drawings]

Figure 1 is a perspective view of the front and rear wheel steering system applied to a rear wheel drive vehicle, Figure 2 is a perspective view of the rear suspension section, and Figure 3 is the first view of the case applied to a non-rear wheel drive vehicle. It is a perspective view similar to. In addition, in the drawing, 15 is a rear steering gear box, 21 is a trailing arm, 28 is a pivot shaft,
31, 32, 33 are links, 34, 35, 36 are ball joints, 39 is a wheel, and 45 is a holder.

Claims (1)

[Claims] 1. A rear suspension consisting of a trailing arm that rotatably supports the rear wheel on the rear end side, and three links that are connected to the trailing arm at one end and are arranged approximately in the lateral direction of the vehicle body. In the vehicle equipped with this, the trailing arm is pivotally supported by a swinging arm that is swingably supported on the vehicle body to allow movement in the lateral direction of the vehicle body, and a ball joint is attached to one end of the three links. The other ends of two of the three links are supported by the vehicle body via rubber bushings, and the other end of the remaining link is jointly connected to a rear wheel steering connecting shaft. Rear wheel steering system for vehicles.