JPH0616111U - Vehicle suspension system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a suspension device for a vehicle, which can adjust the damping force of the suspension according to the condition of the road surface to improve the riding comfort and the steering stability. A leaf spring 3 that elastically supports an axle 4 of an automobile and is composed of a plurality of leaves 2 having different curvatures is provided. The leaf 2 on the front end side of the leaf spring 3 is provided.
A roller 10 is provided which is inserted between the rollers 10 in a direction orthogonal to the longitudinal direction of the leaf 2 and is fixed coaxially with the roller 10.
A disc 12 that rotates integrally with 0 is provided, and a disc 12 is sandwiched by a signal from a control unit 13 to brake the rotation of the roller 10 and to change a frictional force between the leaves 2 between the leaves 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle suspension device that elastically supports an axle of a vehicle.

[0002]

[Prior art]

 Suspension devices are attached to the axles to support the weight of the vehicle, reduce the impact of uneven road surfaces, and enable comfortable driving.

The suspension device shown in FIG. 4 is called a leaf spring type suspension, in which a plurality of leaves (disc springs) 2 having different curvatures are provided in a stacked state along the front-rear direction of the vehicle, and a leaf spring 3 is provided. The leaf 2 is configured to generate a damping force by friction between the leaves 2.

Each of the leaves 2 has a different warp (camber) when there is no load, and a gap (nip) is formed between the plates before assembling, but these leaves 2 have a proper gap and a plurality of clips. It is fixed by 3a and the gap of the leaf 2 is eliminated. In this leaf spring 3, the leaf 2 in the upper stage has the longest length, and the leaves 2 that are gradually shorter downward are stacked.

A rear wheel axle 4 is provided at the center of the leaf spring 3, and a shock absorber 5 is provided on the axle 4. The damping force is also generated by this shock absorber 5.

A front end portion of the leaf spring 3 is rotatably provided on a vehicle via a bracket 6, and a rear end portion of the leaf spring 3 is provided with a shank 7 for changing a length of the leaf spring 3. It is connected to the bracket 8.

[0007]

[Problems to be solved by the device]

 In the leaf spring type suspension described above, the damping force of the leaf spring 3 itself is determined by the friction between the plates, and the damping force cannot be changed. Therefore, switching the suspension according to the weight of the load and the condition of the road surface can only be performed by switching the shock absorber 5.

However, the switching by the shock absorber 5 has a limitation in adjusting the damping force of the suspension. In other words, since the damping force of the leaf spring 3 is constant, the degree of freedom of the suspension is narrow, and it has not been possible to improve ride comfort and maneuverability.

The present invention has been made in view of the above circumstances. The purpose of the present invention is to adjust the damping force of the suspension according to the weight of the load and the condition of the road surface to improve the riding comfort. And to provide a vehicle suspension system that can provide driving stability.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the vehicle suspension device of the present invention is provided with a leaf spring that elastically supports an axle of an automobile and is composed of a plurality of leaves having different curvatures, and the leaf spring on the front end side of the leaf spring. A rotary shaft that is inserted between them in a direction orthogonal to the longitudinal direction of the leaf is provided, and a disc that is fixed to this rotary shaft and rotates integrally with the rotary shaft is provided. It consists of a brake that clamps between the leaves to apply braking to the rotation of the rotating shaft and change the frictional force between the leaves.

[0011]

[Action]

 According to the vehicle suspension device having the above-described configuration, when a heavy object is mounted on the vehicle or when traveling on a rough road, a sensor or the like detects the command and outputs a command signal from the control unit to drive the brake. This brake clamps the disc and adjusts the rotation of the rotating shaft that is integrated with the disc. Then, the interplate frictional force between the leaves changes.

In this way, the damping force of the leaf spring can be adjusted stepwise between soft and hard by changing the interplate frictional force between the leaves according to the weight of the load and the condition of the road surface. This will increase the degree of freedom of suspension and improve the ride comfort and maneuverability of the vehicle.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In addition, the same components as those described in the related art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, rollers 10 as a rotating shaft are inserted between the front end sides of the leaves 2 in a direction orthogonal to the longitudinal direction of the leaves 2. A disc 11 is provided at one end of the roller 10 and serves as a disc that rotates integrally with the roller 10. A brake 12 that holds the disc 11 is provided at the upper end of the peripheral edge of the disc 11. The brake 12 has the same structure as a disc brake that brakes the axle of an automobile.

An air pipe or a hydraulic pipe is connected to the brake 12, and a controller 13 as a control unit controls a valve provided in the middle of the air pipe or the hydraulic pipe to operate the brake 12. Has become. A vehicle height sensor and a vehicle weight sensor (not shown) are connected to the controller 13. These sensors detect the weight of loaded items on the truck and the running conditions. This detection signal is input to the controller 13 including an ECU, etc., and the valve is braked by the signal from the controller 13. The brake 12 holds the disc 11 and applies braking to the rotation of the roller 10 to change the inter-plate frictional force between the front end sides of the leaves 2.

Further, as shown in FIGS. 1 and 2, the brake 12 is provided with columns 14 projecting obliquely downward from the left and right thereof. A roller 15 is rotatably provided at the lower end of the column 14. The roller 15 is configured so as not to rotate together with the disc 11 when the brake 12 holds the disc 11 by contacting the leaf 2.

Next, the operation of the vehicle suspension device configured as described above will be described. When a heavy object is mounted on the vehicle or when traveling on a rough road, the vehicle height sensor or vehicle weight sensor (not shown) detects traveling conditions and the like, and sends a detection signal to the controller 13. Based on this detection signal, the controller 13 issues a command signal to drive the brake 12. The right and left columns 14 of the brake 12 allow the brake 12 to hold the disc 11 without rotating together with the disc 11 and adjust the rotation of the roller 10.

In this way, the damping force of the leaf spring 3 is adjusted stepwise between soft and hard by changing the interplate frictional force between the leaves 2 in accordance with the weight of the load and the condition of the road surface. As a result, the degree of freedom of suspension is increased, and the comfortable riding comfort and maneuverability of the vehicle can be improved. In the present embodiment, only the suspension device on one side has been described, but the suspension devices are provided as a left and right pair on both sides of the vehicle.

The brakes of the suspension device of this vehicle are simultaneously actuated on the left and right, but one side brake may be actuated to suppress the roll of the vehicle body when turning, for example.

Further, during sudden steering wheel operation, sudden start, high-speed braking, and when schromezing, vehicle body bouncing (jumping) and pitching (vertical shaking) are detected, and the brakes of suspension devices on one side or both left and right sides are automatically detected. It is also possible to control the damping force characteristics of the suspension by activating.

[0021]

[Effect of device]

 Since the present invention is configured as described above, it is possible to adjust the damping force of the suspension easily and smoothly according to the weight of the load and the condition of the road surface, which improves the riding comfort and steering stability. effective.

[Brief description of drawings]

FIG. 1 is a side view of a suspension according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a brake portion in the embodiment.

FIG. 3 is an enlarged plan view of a brake portion in the embodiment.

FIG. 4 is a side view of a conventional vehicle suspension device.

[Explanation of symbols]

2 ... leaf, 3 ... leaf suspension, 10 ... roll,
11 ... Disc, 12 ... Brake.

Claims (1)

[Scope of utility model registration request] 1. A leaf spring, which elastically supports an axle of an automobile and is composed of a plurality of leaves having different curvatures, and a leaf spring on the front end side of the leaf spring, which penetrates in a direction orthogonal to the longitudinal direction of the leaf. The rotary shaft to be inserted, the disc fixed to the rotary shaft and rotating integrally with the rotary shaft, and the disc sandwiched by the signal from the control unit to brake the rotation of the rotary shaft and to interleave the leaves. A vehicle suspension device comprising a brake that changes frictional force.