JPS628673Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a single cylinder hydraulic shock absorber in which a gas chamber and an oil chamber are formed in a cylinder, and a piston is slidably fitted into the oil chamber. The present invention relates to a damping force adjustment device for a shock absorber, which is provided with a partition member having oil holes on a push side and a pull side, and a valve that opens these oil holes by hydraulic pressure against a spring.

In this type of equipment, the oil chamber and gas chamber are in direct contact, and the violent vibration of the piston can cause oil to blow up, causing gas to get mixed into the oil or stick to the cylinder wall. In order to prevent the performance of the shock absorber from deteriorating due to changes in the amount of oil, a partition wall member is provided slightly below the oil level in contact with the gas chamber for the purpose of blowing up the oil or generating damping force during the pushing stroke. However, there was no means to adjust the damping force.

In view of the current situation, the present invention provides a device that allows the damping force to be easily adjusted.

To explain this with reference to the illustrated embodiment, reference numeral 1 indicates a cylinder, the upper part of which is closed with a joint metal 2, and a gas chamber 3 filled with gas and an oil chamber 4 filled with oil. Above the oil chamber 4 is provided a partition wall 7 having an oil hole 5 on the push side and an oil hole 6 on the pull side. 9, and a valve 11 that closes the oil hole 6 on the pull side with a dish-shaped spring 10. The disc spring 10 is supported by a retaining ring 12, and the valve 9 is fitted together with the spring 8 into a cylindrical guide 14 having a flow passage 13 formed in its side wall.The guide 14 is further inserted into the cylinder from the joint metal 2. It is attached to the tip of the extending shaft cylinder 15, and the shaft cylinder 1
A plunger 16 having a sheet at one end that supports the spring 8 is fitted into the plunger 5 .
An adjusting screw 19 having an oil chamber 17 formed at the other end, a piston 18 being fitted into the oil chamber 17, and the piston 18 being screwed into the joint metal 2 so as to be freely retractable.
was connected to. In the figure, 20 is a piston that is slidably inserted into the oil chamber 4 of the cylinder 1, and a coil spring 23 is interposed between the cylinder 1 and a pedestal 22 that supports the piston rod 21 of the piston 20. There is.

Next, the operation will be explained. When the oil pressure in the oil chamber 4 on the lower side of the partition wall 7 increases due to the sliding of the piston 20, the oil pressure causes the valve 9 provided in the oil hole 5 on the push side to be activated by the spring 1.
The oil flows onto the partition wall member 7 by opening against the elastic force of 0. At this time, the inflowing oil flows through the flow path 13 in the side wall of the guide 14, so even if the piston 20 violently vibrates, the oil flows into the partition wall member 7. There is no oil blow-up and the gas in the gas chamber 3 is evenly compressed to obtain a stable damping force.
The damping force can be freely adjusted by an oil chamber 17 at the other end of the plunger 16, which is adjusted via a piston 18 provided at the plunger 9.

In this way, according to the present invention, the joint metal 2 of the cylinder 1 is provided with the shaft tube 15 extending in the axial direction into the cylinder 1, and one end of the plunger 16 provided in the shaft tube 15 is connected to the partition wall member of the cylinder 1. The spring 10 of the valve 9 provided in the push-side oil hole 5 of the plunger 7 is supported, and an oil chamber 17 is provided at the other end of the plunger 16. Since the piston 18 that interlocks with the screw 19 is inserted, the adjustment screw 19
The damping force on the push side can be freely adjusted by moving the adjustment screw forward and backward, but the adjustment is performed by the hydraulic pressure of the oil chamber 17 into which the piston interlocked with the screw 19 is fitted. It has the advantage that it can be made large and its adjustment is easy.

[Brief explanation of the drawing]

The drawing is a partially cutaway vertical sectional view showing an embodiment of the present invention. 1...Cylinder, 2...Joint metal, 3
...Gas chamber, 4...Oil chamber, 5...Push side oil hole, 6...
...Pull side oil hole, 7...Partition member, 8...Spring, 9...
... Valve, 15 ... Shaft cylinder, 16 ... Plunger, 17
...oil chamber, 18...piston, 19...adjustment screw.

Claims (1)

[Scope of utility model registration request] A fixed partition member is provided in the oil chamber of the cylinder filled with oil and high-pressure gas, and includes oil holes on the push side and the pull side, and valves that open the oil holes with hydraulic pressure against a spring. A single-tube hydraulic shock absorber in which a piston is provided to be slidably fitted to the lower surface of the partition member, and a coil spring is interposed between the cylinder and a pedestal that supports the piston rod of the piston,
A joint metal that closes the gas chamber side of the cylinder has an axial cylinder extending into the cylinder, and one end of a plunger that is inserted into the cylinder is fitted with a valve spring provided in the push-side oil hole of the partition member. The damping force adjustment is characterized in that an oil chamber is provided at the other end of the plunger, and a piston that is interlocked with an adjustment screw that is screwed into the joint metal so that it can move forward and backward is inserted into the oil chamber. Device.