JP2521844Y2 - Suspension for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle suspension. More specifically, the present invention relates to a shock absorber having a variable damping force.

[Related Art] In order to improve the steering stability and ride comfort of a vehicle, a shock absorber having a variable damping force is provided in each of a front suspension portion and a cab suspension portion. These shock absorbers switch the suspension characteristics of each suspension unit between hardware and software by operating a changeover switch provided in a driver's seat.

Conventionally, the changeover switch is provided independently in the driver's seat for the front shock absorber and for the cab shock absorber.

[Problem to be Solved by the Invention] For this reason, when changing the suspension characteristics of the front suspension unit and the cab suspension unit, each switch has to be operated separately. Especially when traveling on uneven roads, it is necessary to soften the suspension characteristics of both the front suspension and the cab suspension in order to improve steering stability and ride comfort. It was necessary to operate the changeover switch.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle suspension that can simultaneously soften the suspension characteristics of a cab suspension portion with a single operation when the suspension characteristics of the front suspension portion are softened depending on the traveling road surface.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object will be described based on the drawings corresponding to the embodiments.

The vehicle suspension according to the present invention includes a front shock absorber 16 provided on a front suspension portion 12 of a vehicle, the suspension characteristics of which can be adjusted in a hard or soft manner, and a suspension provided in a cab suspension portion 22 with a hard or soft suspension characteristic. Cab shock absorber 26, which can be adjusted to the same, switching means 31 for controlling front shock absorber 16 and cab shock absorber 26, respectively, to switch each suspension characteristic of front suspension portion 12 and cab suspension portion 22 to hard or soft, 32.

Its characteristic configuration is the front shock absorber 16
A thin tube that communicates between the upper piston chamber 16a and the lower piston chamber 16b
An electromagnetic valve 16d for opening and closing this thin tube 16c is provided on 16c, and an electromagnetic valve 26d for opening and closing this thin tube 26c is provided for a thin tube 26c communicating the upper piston chamber 26a and the lower piston chamber 26b of the cab shock absorber 26, and switching is performed. Means 31, 32 have a first hardware terminal 31a for switching the suspension characteristics of the front suspension unit 12 to hardware and a first software terminal 31b for switching the suspension characteristic to software. The first switch 3 electrically connected to the solenoid valve 16d.
1, a second hardware terminal 32a for switching the suspension characteristics of the cab suspension unit 22 to hardware, and a second
A second changeover switch 32 having a software terminal 32b and electrically connected to the solenoid valve 26d; and a first changeover switch 31 provided between the first software terminal 31b and the second software terminal 32b. When switching to the software terminal 31b, the second switch 32
And a diode 34 for softly adjusting the suspension characteristics of the cab suspension section 22 irrespective of the switching position.

[Operation] When the vehicle travels on a road surface with little unevenness, the first switch 31 is switched to the first hardware terminal 31a, and the second switch 32 is switched to the second hardware terminal 32a according to the number of occupants.
Alternatively, the terminal is switched to the second software terminal 32b. When the first changeover switch 31 is switched to the first hardware terminal 31a, the solenoid valve 16d holds the thin tube 16c in a closed state, so that the suspension characteristics of the front suspension unit 12 are in a hard state, and pitching and lateral vibration are caused. Is reduced.

When the vehicle travels on an uneven road, the first switch 31 is switched to the first software terminal 31b. As a result, the solenoid valve 16d communicates with the thin tube 16c, and a control signal flows to the solenoid valve 26d via the diode 34 without automatically switching the second switch 32 to the second software terminal 32b. 26c communicates. As a result,
The suspension characteristics of the front suspension section 12 and the cab suspension section 22 can be made soft.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

In the figure, 10 is a front wheel, and 20 is a cab. The front wheel 10 is provided with a front suspension portion 12 for suspending a chassis frame 11. The front suspension unit 12 includes a leaf spring 14 and a front shock absorber 16. The front shock absorber 16 is a double-cylinder shock absorber having a variable damping force. In this example, an upper piston chamber 16a filled with oil and a lower piston chamber 16b communicate with each other via a thin tube 16c, and are always in the middle of the thin tube 16c. A closed solenoid valve 16d is provided.

A cab suspension portion 22 for suspending the cab 20 from the chassis frame 11 is provided. Cab suspension section 22
Is a cylindrical coil spring 24 provided at the bottom of the cab 20 and a cab shock absorber 26 provided at the back of the cab 20.
Consists of The cab shock absorber 26 is a double-cylinder shock absorber whose damping force is variable like the front shock absorber 16, and in this example, the upper piston chamber 26a filled with oil and the lower piston chamber 26b communicate with each other via a thin tube 26c. A normally closed solenoid valve 26d is provided in the middle of the thin tube 26c.

The driver's seat in the cab 20 has shock absorbers 16, 26
First and second changeover switches 31 and 32 for controlling the respective solenoid valves 16d and 26d are provided, and the respective solenoid valves 16d and 26d are electrically connected to the first and second changeover switches 31 and 32, respectively. Is done. 33 is a battery. The first changeover switch 31 has a first hardware terminal 31a and a first software terminal 31b, and the second changeover switch 32 has a second hardware terminal 32a and a second software terminal 32b. A diode 34 is provided between the first software terminal 31b and the second software terminal 32b. The diode 34 has its anode connected to the first soft terminal 31b,
The cathode is connected to the second soft terminal 32b.

In the vehicle suspension configured as described above, when the vehicle travels on a road surface with little unevenness such as a highway, the driver sets the first changeover switch 31 to the first hardware terminal.
The second switch 32 is switched to the second hardware terminal 32a or the second software terminal 32b according to the number of occupants or the like. When the first changeover switch 31 is switched to the first hardware terminal 31a, no control signal flows to the solenoid valve 16d, and the thin tube 16c does not communicate. As a result, the suspension characteristics of the front suspension unit 12 are in a hard state, and pitching and lateral vibration are reduced. The steering characteristics can be changed to the understeer characteristics to improve the steering stability.

When the vehicle travels on an uneven road, the driver sets the first switch 31 to the first software terminal 31.
Switch to b. By this switching, a control signal flows to the solenoid valve 16d to communicate with the thin tube 16c, and a control signal is sent to the solenoid valve 26d via the diode 34 without switching the second switch 32 to the second software terminal 32b. Then, the thin tube 26c automatically communicates.

As a result, the suspension characteristics of the front suspension section 12 and the cab suspension section 22 are both in a soft state, the vibration of the vehicle body is reduced, the dynamic stress of each section can be reduced and the life can be increased, and Riding comfort can be improved. At the same time, the steering characteristics can be made neutral steering characteristics or oversteering characteristics.

The shock absorber having a variable damping force shown in the above example is an example, and the present invention is not limited to this.

[Effects of the Invention] As described above, according to the present invention, when the suspension characteristics of the front suspension portion are softened depending on the traveling road surface, the suspension characteristics of the cab suspension portion can be simultaneously softened by a single operation. This makes it possible to always drive comfortably without forgetting to switch the suspension characteristics of the cab suspension.

[Brief description of the drawings]

The figure is a block diagram of the vehicle suspension according to the embodiment of the present invention. 10: front wheel, 12: front suspension, 16: front shock absorber, 16a, 26a: piston upper chamber, 16b, 26b:
Piston lower chamber, 16c, 26c: thin tube, 16d, 26d: solenoid valve, 20: cab, 22: cab suspension section, 26: cab shock absorber, 31: first switch (switching means), 31a:
Terminal for first hardware, 31b: Terminal for first software, 32: Second switch (switching means), 32a: Terminal for second hardware, 32b:
Second software terminal, 34: diode.

Claims (1)

(57) [Scope of request for utility model registration] 1. A front shock absorber (16) provided on a front suspension part (12) of a vehicle, the suspension characteristics of which can be adjusted in a hard or soft manner, and a suspension characteristic provided on a cab suspension part (22). A cab shock absorber (26) that can be adjusted in a hard or soft manner, the front shock absorber (16) and the cab shock absorber (26) are controlled respectively to control the front suspension part (12) and the cab suspension part (22). A vehicle suspension comprising switching means (31, 32) for switching each suspension characteristic between hard and soft, comprising: an upper piston chamber (16a) and a lower piston chamber (16b) of the front shock absorber (16). Capillary (16
An electromagnetic valve (16d) for opening and closing the thin tube (16c) is provided in c), and a thin tube (26) for communicating the upper piston chamber (26a) and the lower piston chamber (26b) of the cab shock absorber (26).
c) is provided with an electromagnetic valve (26d) for opening and closing the thin tube (26c), and the switching means (31, 32) is a first hardware terminal (31a) for switching the suspension characteristics of the front suspension unit (12) to hardware. ) And the first software terminal (31b) that switches to software
A first changeover switch (31) electrically connected to the solenoid valve (16d), and the cab suspension unit (2
The second hardware terminal (3) that switches the suspension characteristics of 2) to hardware
2a), a second switch (32) having a second software terminal (32b) for switching to software and electrically connected to the solenoid valve (26d); the first software terminal (31b); When the first switch (31) provided between the second software terminals (32b) switches to the first software terminal (31b), regardless of the switching position of the second switch (32). A vehicle suspension comprising: a diode (34) for softly adjusting a suspension characteristic of a cab suspension section (22).