JPS60199715A - Spring constant variable type suspension - Google Patents

Abstract

PURPOSE:To set the spring characteristic of a suspension to a soft or hard state and ensure comfortability to ride in a car, etc. by supporting a sub spring on a cylinder unit and locking the operation of the cylinder unit as requested. CONSTITUTION:A cylinder unit 4 is supported on a mount base 2 mounted and supported on the body of a car through mount rubber 5. The unit 4 consists of a cylinder 6 and a piston 7 and a sub spring 8 is hung between the cylinder 6 within a hydraulic chamber (A) and the piston 7. The hydraulic chamber (A) and a hydraulic chamber (B) are connected mutually through a connection path 11 and an opening and closing valve 12 and a check valve 13 are inserted in parallel in the middle of this connection path 11. As a result, if the car moves up and down following the undulations on a road surface, both main and sub springs 16 and 8 are expanded and contracted and oil is reciprocated between the hydraulic chambers (A) and (B), while the spring constant of the suspension indicates a low value in which the spring constants of the spring 16 and 8 are synthesized.

Description

[Detailed description of the invention] The present invention relates to a variable spring constant suspension.

As a suspension system for a vehicle, a type in which a shock absorber 120 and a suspension spring 101 are separately provided as shown in FIG. 1 is known, but in this type of suspension system, the spring constant of the suspension spring is It remained constant. In FIG. 1, 121 is a lower arm, and 122 is a spindle that rotatably supports a wheel.

By the way, for a vehicle, the spring characteristics of the suspension that makes up the suspension system are soft in order to maintain high ride comfort during normal driving, and the suspension is adjusted to maintain high running stability during flaking or turning. It is desirable to maintain a hard spring characteristic.

However, in the conventional suspension near, the spring constant remains constant as described above, so it has been impossible to achieve the above.

The present invention has been made in view of the above circumstances, and its purpose is to provide a variable spring constant that can improve the riding comfort and running stability of a vehicle by changing the spring constant as necessary. There is a type of suspension available.

In order to achieve such an object, the present invention provides a suspension in which a shock absorber and a suspension spring are separately provided. A sub-spring is stretched between them, and the oil chamber of this and the oil chamber of the external accumulator are communicated via a communication passage, and an on-off valve is interposed in the middle of the communication passage.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. □ FIG. 2 is a cutaway side view of the suspension spring 1 of the suspension according to the present invention. It should be noted that the suspension of the present invention is constituted by a shock absorber provided separately from the suspension spring 1, but since this is the same as the conventional one, a description thereof will be omitted.

In Fig. 2, reference numeral 2 denotes a mount base that is attached and supported to the vehicle body with bolts 3.
A cylinder unit 4 is supported via a toe/trapper 5.

The cylinder unit 4 includes a cylinder 6 and a cylinder 6.
The cylinder 6 has an oil chamber A defined by the piston 7. A sub-spring 8 is stretched between the cylinder 6 and the piston 7 in this oil chamber A.
Nuclear oil chamber A and diaphragm 1 of external accumulator 9
It communicates with the oil chamber B divided by 0 through a communication passage 11, and an on-off valve 12 and a check valve 13 are interposed in parallel in the middle of this communication passage 11. Note that a gas chamber C is formed within the accumulator 9.

By the way, the piston 7 is equipped with an asper spring spring.
A main spring 16 is stretched between the upper spring seat 14 and the lower spring seat 15.

Next, the action of this suspension will be explained.

When the vehicle is normally running, the on-off valve 12 is open, and therefore,
In this state, oil chambers A and B are in communication with each other.

Therefore, when the wheels move up and down following the undulations of the road during normal driving, both the main and sub springs 16,
8 expands and contracts, the piston 7 moves up and down within the cylinder 6, and the oil reciprocates between oil chambers A and B. The spring constant of the suspension at this time is a relatively low value obtained by combining the spring constants of both springs 8 and 16, and therefore, the ride comfort of the vehicle during normal driving is relatively good.

Next, when the on-off valve 12 is closed when the vehicle is braking or turning, the communication between the oil chambers A and B is cut off, and as a result, the vertical movement of the piston γ is locked, and only the main spring 16 expands and contracts. However, the sub-spring 8 does not function.

As a result, the spring constant of the suspension becomes equal to the spring constant of the main spring 16 and exhibits a relatively high value.
Therefore, running stability during braking or turning is improved. In addition, the check valve 13 is connected from oil chamber B to A.
This is to allow oil to flow in this direction and to lock the piston 7 in a further lower position.

FIG. 3 shows a modified embodiment of the present invention, which differs from the one shown in FIG. 2 only in that the cylinder 6 constituting the cylinder unit 4 is directly connected to the vehicle body, and the other configuration is the second embodiment. It is exactly the same as shown in the figure. Therefore, the same effects as those obtained in the first embodiment can be obtained in this modified embodiment.

As is clear from the above description, according to the present invention, the suspension spring is composed of a cylinder unit and a main spring, the cylinder unit supports the subspring, and the operation of the cylinder unit is locked as necessary. The spring characteristics of the suspension can be set to be soft or hard, and the ride comfort and running stability of the vehicle can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a vehicle suspension system showing a conventional suspension, and FIG. 2 is a cutaway side view of a suspension spring constituting a variable spring constant suspension according to the present invention.
FIG. 3 is a cutaway side view of the upper part of the suspension spring according to the modified embodiment. In the drawings, 1 is a variable spring constant suspension, 4 is a cylinder unit, 6 is a cylinder, 7 is a piston, 8 is a sub-spring, 9 is an accumulator, 11 is a communication passage, 12 is an on-off valve, 13 is a check valve, 16 is a main spring, and A and B are oil chambers. Patent Applicant Showa Seisakusho Co., Ltd. Agent Patent Attorney 2 1) Production Department Patent Attorney Kuni Ohashi Production Volume Patent Attorney Yu Koyama Figure 1

Claims (1)

[Claims] In a tail suspension in which a shock absorber and a suspension spring are provided separately, the suspension spring is composed of a cylinder unit and a main spring, and a sub-spring is stretched between the piston part and the cylinder part of the cylinder unit, and this An oil chamber of an external accumulator is connected to an oil chamber of an external accumulator through a communication passage, and an on-off valve is interposed in the middle of the communication passage.