JPH06454B2 - Variable shock absorber device for vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable shock absorber device using a suspension hydraulic circuit of a vehicle having a suspension cylinder.

2. Description of the Related Art Conventionally, a so-called fixed damper having a constant throttle diameter is inserted in a suspension hydraulic circuit to obtain a vehicle body damping effect.

Problems to be Solved by the Invention However, in the fixed damper, the damping force is determined only by the piston speed of the suspension cylinder, and in order to obtain a certain level of riding comfort under all road conditions and driving conditions, a wide frequency range is required. The vibration component of the vehicle could not be attenuated, and there was a trade-off between riding comfort and running stability.

The present invention has been made in view of the above circumstances, and the purpose thereof is that when traveling straight on a normally paved road surface, the riding comfort is soft and the ride comfort is sharp, the suddenness is small, but the suddenness is small. When a sudden change in posture occurs in the vehicle body, a damping force is applied to suppress unpleasant vehicle body swinging during traveling on rough terrain to ensure riding comfort and to obtain traveling stability.

Means and Actions for Solving Problems The present invention relates to a head side circuit for connecting the head side chambers 2A, 3A, 4A, 5A of the front left and right side and rear left and right side suspension cylinders 2, 3, 4, 5 to each other. 6 and the rod side chambers 2B, 3B, 4B, 5B of the suspension lock cylinders 2, 3, 4, 5
The front and left and right and rear left and right double pilot check valves 8, 9, 10 and 11 are provided in the rod side circuit 7 which connects the two to each other, and the front and left and right and rear left and right head side check valves are provided in the head side circuit 6. Variable throttle valves 12, 13, 14, 15 are provided, and variable throttle valves 16, 17, 1 with check valves on the front left and right rod sides and rear left and right rod sides are provided in the rod side circuit 7.
8 and 19 are provided, and the pilot relief valves 20, 21, 22 and 23 are provided in parallel with the variable throttle valves 16, 17, 18 and 19 with the check valve in the rod side circuit 7, and when the brake is applied, uneven ground is provided. Variable throttle valve with check valve 12 when running
Pinch to obtain damping force by squeezing ~ 16 orifices.
Rolling is suppressed, damping is accelerated, the rolling angular velocity is similarly slowed during turning, and damping is also accelerated to rolling. By improving the riding comfort, the peak pressure is released by the pilot relief valves 20, 21, 22 and 23 to prevent the bumps when the bumps pass over, so that the damping force is further weakened and alleviated.

EXAMPLES Examples of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a suspension lock hydraulic circuit. This suspension lock hydraulic circuit 1 is provided with front left and right side and rear left and right side suspension lock cylinders 2, 3, 4, and 5, and is provided on the front left and right sides and the rear left and right sides. The head side chambers 2A, 3A, 4A, 5A of the lock cylinders 2, 3, 4, 5 are connected to each other by a head side circuit 6, and the front side left and right side and rear left and right side rod side chambers 2B, 3B, 4B, 5B is connected by a rod side circuit 7.

Near the front and left and right and rear left and right suspension lock cylinders 2, 3, 4, and 5 of the head side circuit 6 and the rod side circuit 7, respectively, front and left and rear left and right double pilot check valves 8, 9, and 10, respectively. , 11 are provided.

The head side circuit 6 includes variable throttle valves 12 and 13 with check valves on the front left and right head sides and a variable throttle valve 1 on the rear left and right head sides.
4 and 15 are provided, and the rod side circuit 7 is provided with front and right and left rod side variable throttle valves 16 and 17 with check valves and rear left and right rod side variable throttle valves 18 and 19 with check valves. The rod side circuit 7 includes variable throttle valves 16, 17, 1 with check valves on the front left and right rod sides and the rear left and right rod sides.
Pilot relief valve 20, 21, 2 in parallel with 8, 19
2 and 23 are provided. The head-side circuit 6 communicates with the tank 25 via the conduit 24, and the rod-side circuit 7 communicates with the conduit 2
6 to the tank 25, and an electromagnetic valve 27 is provided in the conduit 26.

28, 29, 30, 31 are suspension springs, 32,
Reference numerals 33, 34 and 35 are tires.

Vehicle A has a vehicle speed sensor 36 and a steering wheel rotation angle sensor 3
7, a brake sensor 38, and a suspension stroke sensor 39 are provided.

The vehicle speed sensor 36 and the steering wheel rotation angle sensor 37 are used for rolling prediction when turning, the vehicle speed sensor 36 and the brake sensor 38 are used for predicting nose dive during braking, and the suspension stroke sensor 39 is used for detecting road surface unevenness. used.

Next, the operation will be described.

(1) During braking The variable throttle valve with check valve 12, 13, 14, 1 in the suspension lock hydraulic circuit 1 is controlled by the signals from the vehicle speed sensor 36 and the brake sensor 38 (Berkestop lump).
5,16,17,18,19 are actuated to the smaller one of the orifice to obtain a damping force to suppress the pitching of the front left / right and rear left / right suspension cylinders 2, 3, 4, 5 to accelerate the damping. .

(2) Running on rough terrain The suspension stroke sensor 39 determines the behavior of the vehicle body on a rough terrain road surface from the relationship between the amplitude and the frequency, and the variable throttle valve with check valve 12, 13, 14, 15, 16,
By operating 17, 18, 19 to the smaller orientation, a damping force is obtained and the vibration components of the vehicle body such as pitching and rolling are damped.

(3) When turning, the centrifugal force (lateral G) is calculated from the signals of the vehicle speed sensor 36 and the steering wheel rotation angle sensor 37, and when it becomes necessary to suppress the roll angle, the variable throttle valves with check valves 12, 13, 14,
By operating 15, 16, 17, 18, and 19 to the smaller orientation, the damping force is obtained to slow the rolling angular velocity and accelerate the rolling damping to obtain running stability when changing lanes or cornering.

(4) When riding over bumps When driving straight on a normal pavement surface, the variable throttle valve with check valve 12, 13, 14, 15, 16, 17, 18, 19 is operated to the larger orientation to improve riding comfort. Pilot relief valve 2
By releasing the peak pressure by 0, 21, 22, 23, the damping force is further weakened and relaxed.

EFFECTS OF THE INVENTION Since the present invention is as described above, when braking, traveling on rough terrain, throttle the orifices of the variable throttle valves 12 to 16 with check valves to obtain damping force to suppress pitching and rolling, and accelerate damping. Similarly, when turning, the rolling angular velocity is slowed and the damping of the rolling is accelerated, so that the variable throttle valves with check valves 12 to 16 can be used during straight running on a paved road surface.
The lift relief of the pilot relief valve 20, 21, 2
The damping force can be further weakened and relaxed by letting the peak pressure escape by means of Nos. 2 and 23.

[Brief description of drawings]

FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, and FIG. 2 is an explanatory view of each sensor position in a vehicle. 2, 3, 4, 5 are suspension cylinders, 6 is a head side circuit, 7 is a rod side circuit, 8, 9, 10, 11 are double pilot check valves, 12, 13, 14, 15, 16,
17, 18, 19 are variable throttle valves with check valves, 20, 2
1, 22 and 23 are pilot relief valves.

Claims (1)

[Claims] 1. Head side chambers 2A, 3A, 4A, 5A of suspension cylinders 2, 3, 4, 5 on the front left and right sides and rear left and right sides.
And a head side circuit 6 for connecting them to each other and the rod side chambers 2B, 3B, 4B, 5 of the suspension lock cylinders 2, 3, 4, 5
Front and left and rear left and right double pilot check valves 8, 9, 10, 11 are provided in the rod side circuit 7 connecting B to each other, and the front and left and right head side and rear left and right head side check valves are provided in the head side circuit 6. Variable throttle valve 12, 13, 14, 15
And a variable throttle valve with check valves 16, 17, 1 on the front left and right rod side and rear left and right rod side in the rod side circuit 7.
8 and 19 are provided, and the pilot relief valves 20, 21, 22 and 23 are provided in the rod side circuit 7 in parallel with the variable throttle valves 16, 17, 18, and 19 with the check valve. apparatus.