JPH0240338Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention relates to an improvement of a damper for a vehicle.

(Prior art) In order to maintain high ride comfort during normal driving, dampers have softer spring characteristics.
In addition, it is desirable to maintain the spring characteristics of the damper hard in order to maintain high running stability during braking or turning. All you have to do is change it. Furthermore, in order to make the above effects even more effective, it is desirable to adjust the damping force as well as the spring constant of the damper.

(Purpose of the invention) The invention was made based on the above viewpoints,
The object of the present invention is to provide a damper for a vehicle that can simultaneously change the spring constant and damping force depending on the running condition of the vehicle to improve ride comfort and running stability of the vehicle.

(Structure of the invention) In order to achieve the above object, the invention provides a cylinder unit at the outer extending end of the cylinder of the piston rod, a sub-spring is stretched between the piston and the cylinder of the cylinder unit, and a liquid chamber is provided above and below the piston. An adjuster rod is inserted into the piston rod, and one end of the adjuster rod has a valve mechanism for opening and closing a liquid passage that brings the liquid chambers into communication with each other, and the other end has a liquid passage area. The damper of the present invention was constructed by providing a variable damping force mechanism.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a side view with a main part of the vehicle damper according to the present invention cut away, and Figs. It is a diagram.

In the vehicle damper 1 shown in FIG. 1, 2 is a cylinder having a double cylindrical structure with inner and outer cylinders 3 and 4, and a hollow piston rod 5 is inserted into the inner cylinder 3 from above as shown in the figure. A main piston 6 is connected to the outer periphery of the lower end of the hollow piston rod 5 and is fitted onto the inner periphery of the inner cylinder 3 so as to be vertically slidable. A predetermined hydraulic oil is sealed within the cylinder 2.

On the other hand, a cylinder unit 10 is fixedly installed at the upper end of the piston rod 5, and a sub-piston 12 is fitted into the cylinder 11 of this unit so as to be vertically slidable. Chambers S ₁ and S ₂ are formed respectively, and the sub-piston 11
A sub-spring 13 is stretched between the cylinder 2 and the cylinder 11 as shown in the figure. Note that the planar cross-sectional areas of both oil chambers S ₁ and S ₂ are set to be equal.

Incidentally, an adjuster rod 14 is inserted and fitted into the hollow piston rod 5, and an actuator 30 is connected to the upper end of the adjuster rod 14 to move it up and down. A hollow portion 14a is formed at the upper end of the adjusting rod 14, and oil holes 5a provided in the piston rod 5 are formed on the upper and lower side walls of the hollow portion 14a.
Oil holes 14b and 14c selectively adapted to the hole 5b are drilled. The oil holes 5a and 5b provided in the piston rod 5 open into an oil chamber S ₁ and an oil groove 12a formed in the inner circumference of the piston 12, respectively. It communicates with the oil chamber _S2 via a plurality of oil passages 12b. Incidentally, the cylinder unit 10 is supported by a mount base 16 via a shear mount rubber 15.

On the other hand, an inverted L is provided at the lower end of the adjuster rod 14.
A letter-shaped oil passage 14d is formed, and oil holes 5c and 5d of different diameters are formed in the upper and lower portions of the lower side wall of the piston rod 5 to selectively fit the oil passage 14d.

In addition, 17 in FIG. 1 has its upper end connected to the piston 1.
This is a cylindrical cover that is movable up and down and comes into contact with the lower surface of the cylinder 2. An upper spring seat 18 is fixed to the outer periphery of this cover as shown in the figure. A main spring 20 is stretched between the lower spring seats 19. In addition, in the figure,
21 is a dust cover.

Next, the operation of the present damper 1 will be explained.

When the vehicle is running normally, the oil holes 14b and 14c of the adjuster rod 14 fit into the oil holes 5a and 5b of the piston rod 5, respectively, as shown in the figure, and therefore, in this state, the oil chambers _S1 and _S2 are filled with oil. Hole 5
a, 14b, hollow part 14 of azimuth rod 14
a, oil holes 14c, 5b, hot water groove 12a and oil passage 12
They communicate with each other via b... Also, during normal running, the oil passage 14d formed at the lower end of the adjuster rod 14 is connected to the large diameter oil hole 5c as shown in the figure.
Compatible with

When the cylinder 2 and piston rod 5 repeatedly expand and contract relative to each other in accordance with the undulations of the road surface, both the main and sub springs 20 and 13 expand and contract, and as a result, the sub piston 12, cylindrical cover 17, and hot springs expand and contract. The parspring seat 18 moves up and down as a unit, and the hydraulic oil reciprocates between the oil chambers _S1 and _S2 . The spring constant of damper 1 at this time is both springs 20, 1
It shows a relatively low value combining the spring constants of 3,
Further, since the hydraulic oil in the cylinder 2 passes through the large-diameter oil hole 5c, the damping force exhibits a relatively low value, and therefore, the ride comfort of the vehicle during normal running is relatively good.

Next, when the actuator 30 is actuated to move the adjuster rod 14 downward when the vehicle is braking or turning, the oil holes 5a and 5b provided in the piston rod 5 are closed by the adjuster rod 14, and therefore the oil is removed. Communication between chambers _S1 and _S2 is cut off, and as a result, the vertical movement of the piston 12, cylindrical cover 17, and upper spring seat 8 is locked, and only the main spring 20 expands and contracts, and the subspring 13 does not function. . As a result, the spring constant of the damper 1 is equal to the spring constant of the main spring 20, which is a relatively high value, and the oil passage 14d of the adjuster rod 14 is adapted to the small diameter oil hole 5d as shown in FIG. 3b. , the oil holes 5d, 14
The oil passage 14d has a small diameter oil hole 5 as shown in Fig. 3b.
d, the flow resistance of the oil passing through the oil hole 5d increases, and the damping force exhibits a relatively high value.
Therefore, the running stability of the vehicle during braking or turning is improved.

In the above embodiment, the adjuster rod 14 was moved up and down, but it is rotated to move the adjuster rod 14 up and down.
The oil hole 5a is opened and closed as shown in FIGS. The damping force may be adjusted accordingly.

(Effects of the invention) As is clear from the above explanation, according to the invention, since a spring constant variable mechanism and a damping force adjustment section are provided together, the spring constant and damping force can be simultaneously changed according to the running condition of the vehicle. Riding comfort and running stability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view with a main part of the vehicle damper according to the present invention cut away, and Figs. Fig. 4 a, b, Fig. 5 a,
b is a valve mechanism part of a damper according to a modified example;
FIG. 3 is a cutaway plan view of the damping force variable mechanism section. In the drawings, 1 is a vehicle damper, 2 is a cylinder, 5 is a hollow piston rod, 10 is a cylinder unit, 12 is a piston, 13 is a sub-spring, 14 is an adjustable rod, 20 is a main spring, and S ₁ and S ₂ are oil. It is a room.

Claims (1)

[Scope of utility model registration request] A vehicle damper in which a main piston is disposed in a cylinder, a piston rod is fixed to the main piston, and one of the cylinder side and the piston rod side is attached to the vehicle body side, and the other side is attached to the axle side. a sub-cylinder unit is provided at the outwardly extending end of the cylinder;
A sub-spring is stretched between the cylinder of the sub-cylinder unit and the sub-piston disposed within the cylinder, liquid chambers are formed above and below the sub-piston, an adjuster rod is inserted into the piston rod, and the adjuster rod is inserted into the piston rod. A valve mechanism is configured at one end to open and close a liquid passage that communicates the liquid chambers with each other, and a liquid passage area of the liquid passage that communicates the two liquid chambers defined by the main piston is formed at the other end. A vehicular damper comprising a variable damping force mechanism.