JPH0319452Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention relates to an improvement of an on-off valve for a variable spring constant damper.

(Prior art) In order to maintain high ride comfort during normal driving, damper spring characteristics are softened.
Furthermore, it is desirable to keep the spring characteristics of the damper hard in order to maintain high running stability during braking or turning.

Therefore, we arranged two cushion springs in series with a vertically movable separator in between.
The separator is held in a hydraulic cylinder unit, the hydraulic cylinder unit is communicated with the accumulator via a communication passage, and an on-off valve for opening and closing the communication passage is interposed in the middle of the communication passage. A variable spring constant damper is proposed. This variable spring constant damper closes the on-off valve to cut off communication between the hydraulic cylinder unit and the accumulator, locking the operation of the hydraulic cylinder unit and reducing the action of one cushion spring. This prevents this and adjusts the damper's spring constant to a high value.

By the way, as shown in FIG. 2, the above-mentioned on-off valve includes an on-off valve 1 operated by a push-pull actuator 102 in a communication passage 101 connecting an accumulator 100 and a hydraulic cylinder unit.
03, a bypass passage 104 is provided in addition to the communication passage 101, and a check valve 1 is provided in the bypass passage 104, which is biased by a spring 105.
06 is provided. This results in an increase in the number of parts and a complicated structure.

(Purpose of the invention) The present invention was made to solve the above-mentioned problems, and its purpose is to provide an on-off valve for a hydraulic shock absorber with a simple structure that can also serve as a check valve.

(Structure of the invention) In order to achieve the above object, the present invention uses a rotatable valve body as a valve mechanism that operates a cylinder that locks and unlocks the position of a separator interposed between a main spring and a subspring arranged in series. The on-off valve of the present invention was constructed by seating the valve seat on a valve seat using a spring member, and providing an oil hole selectively matching the oil hole formed in the valve body in the valve seat.

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

FIG. 1 is a cutaway side view of a variable spring constant damper equipped with an on-off valve according to the present invention.
is a cylinder, into which a piston rod 2 is inserted from above as shown in the figure, and a piston (not shown) that fits into the inner circumference of the cylinder 1 so as to be vertically slidable is connected to the lower end of the piston rod 2. It is worn. The piston is provided with a valve mechanism that generates a damping force, and the cylinder 1 is filled with hydraulic oil.

The upper end of the piston rod 2 is connected and supported to the vehicle body via a bracket 5 sandwiched between upper and lower mount rubbers 3 and 4 as shown. A cylindrical cover 6 which is open at the bottom is connected below the mount rubber 4 of the piston rod 2 so as to cover part of the outer periphery of the piston rod 2 and the cylinder 1. In addition, in the figure, 7 is a stopper lever.

Further, a plurality of hydraulic cylinder units 10 are fixedly attached to the bracket 5, and a piston 12 is fitted into the cylinder 11 of each hydraulic cylinder unit 10 so as to be vertically slidable. A piston rod 13 extends downwardly from the piston rod. And each piston rod 13
A separator 14 is fixed to the lower end of the cylinder 1, a main spring 16 is stretched between the separator 14 and a spring seat 15 fixed to the lower outer periphery of the cylinder 1, and a sub-spring is mounted between the separator 14 and the bracket 5. It is strung up.

Thus, the oil chamber _S1 defined by the piston 12 in the cylinder 11 of each hydraulic cylinder unit 10 is connected to the oil chamber _S2 of the accumulator 20, which is installed separately from the damper body, via the communication passage 17. It's communicating.
A rotary on-off valve 30 is provided in the middle of the communication passage 17 to appropriately cut off communication between the oil chambers S ₁ and S ₂ .
Inside, a rotatable disc-shaped valve body 32 is mounted with a disc spring 33.
It is seated on the valve seat 34 at . A shaft 35 extends from the valve body 32, and an actuator 36 for rotationally driving the shaft 35 is connected to an end of the shaft 35. Further, the valve body 32 is provided with oil holes 32a that selectively match the oil holes 34a formed in the valve seat 34. On the other hand, the valve seat 34 is provided with an oil hole 34b which is normally closed by the valve body 32, and the oil hole 34a...
...and the oil hole 34b opens into an oil passage 34c provided in the valve seat 34 as shown.

Next, the operation of the main on-off valve 30 will be explained.

During normal running of the vehicle, the oil holes 32a... provided in the valve body 32 of the on-off valve 30 fit into the oil holes 34a... in the valve seat 34 as shown in the figure, so that the oil chambers _S1 and S It is connected to ₂ .

When the cylinder 1 and the piston rod 2 repeatedly expand and contract relative to each other in accordance with the undulations of the road surface, the main spring 16 and the sub-spring expand and contract, and the separator 14 and the piston rod 13 accordingly expand and contract.
... moves up and down, and the oil moves back and forth between oil chambers S ₁ and S ₂ . The spring constant of Kotoki's damper is a relatively low value that combines the spring constants of the main spring 16 and the sub-spring, and therefore, during normal driving, minute vibrations are effectively absorbed and the ride comfort of the vehicle is improved. is relatively good.

Next, when the vehicle is braking or turning, if the actuator 36 is driven to rotate the valve body 32 and close the oil hole 34a of the valve seat 34, the oil chambers S ₁ and S ₂ will be connected. The communication is cut off, and the vertical movement of each piston rod 13 of the hydraulic cylinder unit 10 and the separator 14 held therein is completely locked, and only the main spring 16 expands and contracts, and the other sub-spring does not function.
Therefore, the spring constant of the damper is equal to the relatively high spring constant of the main spring 16, and running stability is maintained relatively high during braking or turning.

In the above state, when a force is applied to each piston rod 13 of the hydraulic cylinder unit 10 to extend it, the valve body 32 of the on-off valve 30 resists the elastic force of the disc spring 33 and moves to the first position. In the figure, the oil hole 34a of the valve seat 34 moves to the right, and as a result, the oil hole 34a of the valve seat 34...
The oil hole 34b opens, and the oil in the oil chamber _S2 of the accumulator 20 flows into the oil chamber _S1 of each hydraulic cylinder unit 10, and as a result, each piston rod 1
3 and separator 14 are locked in the further lowered position.

In this way, since the on-off valve 30 also functions as the conventional check valve 106 shown in FIG. 2, the number of component parts is reduced and the structure is simplified.

(Effects of the invention) As is clear from the above explanation, according to the invention, a rotatable valve element is seated on a valve seat using a spring member, and an oil hole formed in the valve element is selected in the valve seat. Since the on-off valve of the present invention is constructed by drilling an oil hole that is suitable for the valve body and an oil hole that is normally blocked by the valve body, the on-off valve can also function as a check valve. The structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of a variable spring constant damper equipped with an on-off valve according to the present invention, and FIG. 2 is a cutaway side view showing a conventional on-off valve. In the drawings, 1 is a cylinder, 2 is a piston rod, 10 is a hydraulic cylinder unit, 14 is a separator, 16 is a main spring, 17 is a communication passage,
20 is an accumulator, 30 is an on-off valve, 31 is a valve case, 32 is a valve body, 33 is a disc spring, 34
is a valve seat, 34a, 34b are oil holes, 35 is a shaft,
36 is an actuator, and S ₁ and S ₂ are oil chambers.

Claims (1)

[Scope of utility model registration request] A main spring and a sub-spring are arranged in series with a vertically movable separator in between, the separator is held in a hydraulic cylinder unit, and the hydraulic cylinder unit is communicated with an accumulator via a communication path. A rotary on-off valve interposed in the communication passage of a variable constant damper, wherein a rotatable valve body is seated on a valve seat using a spring member, and a hole is formed in the valve seat. A variable spring constant type damper, characterized in that an oil hole selectively adapted to the oil hole is drilled, and the valve element is separated from the valve seat against the elastic force of a spring member so that the valve can be opened. Open/close valve.