A kind of can the compression type air spring of random stop
Technical field
The present invention relates to a kind of compression type air spring, specifically, be a kind of can the compression type air spring of random extension stop.
Background technique
Compression type air spring mainly plays a supportive role, and is widely used for Occasional furniture, toolbox, cabinet, car trunk, bonnet, yacht, medical apparatus, gymnastic apparatus, door and window etc.The working state of existing air spring application technology has two kinds of forms: 1. full expand type, drives piston to be free extended configuration without External Force Acting lower piston rod.Bear after external force is greater than stretching force, after can be compressed to stroke end, change fulcrum and stretching force direction and stop, can not midway stop; 2. lockable type, can make the random stop of piston rod by lockable mechanism.Deficiency is: the using scope of full expand type is restricted; The accessory of lockable type is many, build large, and cost of goods manufactured increases.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of compression type air spring that namely can realize random stop without the need to increasing accessory and cost of production is provided.
The present invention can the technological scheme of the random compression type air spring of stop, and comprise cylinder barrel, piston rod and piston, piston is provided with groove, and be provided with O shape circle in groove, the front portion of piston is front air chamber; Rear portion is rear gas chamber, and the bottom of described groove is made up of cylindrical body and cone, and the width of described groove is greater than 2 times of O shape loop diameter, and the front portion of described groove is provided with multiple equally distributed perforation.
The width of described groove is 2.2 times of O shape loop diameter
Described cylindrical body and cone arc transition.
Described cone and cylindrical transition position are provided with multiple equally distributed groove.
Described perforation has 2-3.
Described groove has 2-3.
When described O shape circle is in cylindrical body, seal between front air chamber and rear gas chamber.
When described O shape circle is in cone, front air chamber is communicated with between rear gas chamber.
The present invention can the beneficial effect of the random compression type air spring of stop be, without the need to increasing random stop when namely accessory and cost of production can realize piston extension.
Accompanying drawing explanation
Fig. 1 is that the present invention can the structural representation of piston when arrested state in the compression type air spring of random stop;
Fig. 2 is that the present invention can the structural representation of piston when mobile status in the compression type air spring of random stop;
Fig. 3 is the enlarged view at I place in Fig. 1;
Fig. 4 is the enlarged view along A-A tangent plane in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention can the compression type air spring of random stop be elaborated.
Shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 can the compression type air spring of random stop, comprise cylinder barrel 1, piston rod 2 and piston 9, piston 9 is provided with groove 7, and be provided with O shape circle 8 in groove 7, the front portion of piston 9 is front air chambers 3; Rear portion is rear gas chamber 10, and the bottom of described groove 7 is made up of cylindrical body 6 and cone 5, and the width of described groove 7 is greater than 2 times that O shape encloses 8 diameters, and the front portion of described groove 7 is provided with multiple equally distributed perforation 4.
The width of described groove 7 is 2.2 times that O shape encloses 8 diameters
Described cylindrical body 6 and cone 5 arc transition.
Described cone 5 is provided with multiple equally distributed groove 11 with the transition position of cylindrical body 6.
Described perforation 4 has 2.
Described groove 11 has 2.
When described O shape circle 8 is in cylindrical body 6, seal between front air chamber 3 and rear gas chamber 10.
When described 0 shape circle 8 is in cone 5, front air chamber 3 is communicated with between rear gas chamber 10.
The working principle of the compression type air spring of the random stop of the present invention is as follows: O shape circle 8 is in Fig. 1 position, piston rod 2, piston 9 extension stop in a free state.Need apply to piston rod 2 stretching force that external force is greater than rear gas chamber 10 air pressure during startup, make O shape enclose 8 and be in Fig. 2 position, piston rod 2, piston 9 can move to rear gas chamber 10 or front air chamber 3, and when reducing externally applied forces and being less than the stretching force of rear gas chamber 10 air pressure, piston rod 2, piston 9 are done to stretch and moved.Quick removal external force, piston 9, by front air chamber 3 and rear gas chamber 10 atmospheric pressure difference effect, makes O shape enclose 8 instantaneously and is in Fig. 1 position, piston rod 2, piston 9 extension stop.