Pneumatic elastic element

 

(57) Abstract:

Usage: engineering. The inventive pneumatic elastic element contains a hermetically sealed from one end of the cylinder filled with compressed gas and liquid, is placed in the cylinder piston Cup and restrictive washer mounted on the rod extending from the second cylinder through the seal Assembly. In the area of the site seal in the cylinder fixed sleeve with an axial projection with the possibility of entering it into the cavity of the Cup when extended from the cylinder stroke position. The body is made in one piece with the piston. 2 Il.

The invention relates to the field of engineering, in particular to pneumatic elastic elements (gas springs), and can be used for opening and holding open the rear doors, engine covers, hatches car.

Known pneumatic elastic elements, which is the soft limit stroke of the open tailgate of the vehicle due to the additional piston (second) posted on the rod inside the cylinder of the elastic element, which, coming in contact with the section of the cylinder of reduced diameter, creates additional resistance p [1]

The disadvantage of this design is its high complexity.

Known pneumatic spring containing a hermetically sealed from one end of the cylinder filled with a compressed gas and a certain amount of liquid placed in the cylinder, the piston, the bearing ring and the guide washer mounted on the rod, with the possibility of axial movement in and out of the cylinder through a seal Assembly, which is a sleeve with an axial protrusion, inside which is located the area of the rod with axial and radial channel at the end of the extension rod from the cylinder. When this annular gap between the sleeve and the rod is an additional resistance to flow of the fluid than is achieved soft limit stroke of the open tailgate of a vehicle. Moreover, the piston rod in all positions the tailgate must be directed downwards relative to the body of the spring [2]

The disadvantage of this device is low-tech manufacturing and a hard limit stroke of the open door at the location of the device stem up, in which there is a flow of fluid from the working area of the gap until the travel limit of the door opening.

Most is from one end of the cylinder, filled with a compressed gas and a liquid, is placed in the cylinder piston Cup and restrictive washer mounted on the rod extending from the second end of the cylinder through the site seal in the zone in which the cylinder is fixed to the sleeve with an axial projection with the possibility of entering it into the cavity of the Cup when extended from the cylinder stroke position [3]

The disadvantage of this device is low-tech manufacturing.

Object of the invention is the improvement of the pneumatic element by providing a soft travel limit open the door regardless of the position of the rod element, as well as improving the manufacturability of the parts of the element.

To solve the problem in pneumatic elastic element containing a hermetically sealed from one end of the cylinder filled with compressed gas and liquid, is placed in the cylinder piston Cup and restrictive washer mounted on the rod, with the possibility of axial movement in and out of the cylinder through a seal Assembly, which is a sleeve with an axial protrusion, according to the invention, on the rod between the piston and sleeve fixed glass made integral with porn the A.

A comparison of the claimed technical solution with the level of technology on scientific, technical and patent documentation on the priority date in the main and adjacent sections shows that the set of essential features of the claimed solution was not previously known, therefore, it corresponds to a condition of patentability "novelty."

Analysis of the known technical solutions in the field of technology have shown that the proposed device has characteristics that are absent in the known technical solutions, and their use in the claimed combination of features gives the opportunity to learn new technical result, therefore, the proposed solution involves an inventive step compared to the current level of technology.

The proposed solution is industrially applicable, because it can be produced industrially, workable, feasible and reproducible, therefore, meets the condition of patentability "industrial applicability".

In Fig. 1 shows a pneumatic spring with stem up, longitudinal section; Fig.2 execution of the piston of the pneumatic element.

Element agnosto move is the rod 2, coming out through the seal Assembly 3. At the end of the rod is placed in the cylinder, a fixed piston Assembly consisting of the piston 4 with the throttle channel 5 and the groove 6, the distribution ring 7 and restrictive washer 8 with grooves 9. Piston Assembly divides the cylinder 1 in the cavities a and B.

On the rod 2 near the piston installed node item in the shape of the glass 10, and the cylinder near the site of the seal 3 is fixed to the sleeve 11, having an axial projection 12, is made in the direction of the piston. The Cup 10 when the movable or stationary mounted on the shaft 2 and the sleeve 11 can be performed by receiving an annular throttle gap between the inner diameter of the cylinder 1 and the outer diameter of the Cup 10 and between the inner diameter of the Cup 10 and the outer diameter of the protrusion 12 of the sleeve 11, or getting the throttle gaps in only one of the mentioned places, or obtaining clearances, non-throttle in both places.

The most common setup diagram element for opening, such as the tailgate of the vehicle, such that in the process of opening the door is the revolution of the element. When the door is closed the predominant position of the item stem down to increase the tightness of the site upl the rod up. The following describes the operation of pneumatic elastic element for this schema installation.

When removing or reducing the external axial load acting on the piston rod 2 of a pressure element at the beginning of the door opening, the rod under the action of gas pressure starts to move from the cylinder 1. When this occurs, the preload Cup 10; if it is rolling fastening on the shaft 2, the washer 8 gas from the cavity And through the annular gap between the Cup 10 and the cylinder 1, the grooves 9, the throttle channel 5 and the groove 6 flows into the cavity B. the Fluid in the cavity And, when the position of the rod element 2 down in the event of a coup item stem 2 moves up to porshneva site and fills the cavity 13 of the Cup 10, and partly through the annular gap between the Cup 10 and the cylinder 1, the grooves 9, channel 5 and the groove 6 flows into the cavity B. the speed of the extension rod 2 of the cylinder 1 is slowed down due to the greater viscosity of the liquid compared to gas. But when the described scheme of installation of an overflow of the liquid is performed at the time of the coup element, long before the limit stroke of the open door. In the position of the element close to fully extended, is the displacement of fluid by the protrusion 12 of the sleeve 11 from the cavity 13 of the Cup 10 and she ri is an even greater decrease in the rate of extension of the rod 2 of the cylinder 1, but already in the desired time and, therefore, is the soft limit stroke of the open door.

Even if the item layout considerations is mounted so that it works without revolution, constantly stock up, the efficiency of the soft travel limit door opening is not reduced because the glass 10 in the compressed position of the element (when the door is closed) will be fluid and will keep it until the travel limit of the door opening.

When installing the item constantly rod down the liquid is about sleeve 11 throughout the course of opening the door, and when the element's position close to the fully extended, is the displacement of fluid from the cavity And into the cavity B already described and is provided by the soft limit stroke of the open door.

The Cup 10 and the sleeve 11 can be made highly efficient method without special machining. The Cup 10 by means of a stamping from sheet metal or powder metallurgy. The bushing 11 - methods of powder metallurgy or casting plastic. This is achieved by improving the manufacturability of the design and reducing the cost of manufacture of the item in the conditions of mass production the config compressed gas and liquid, placed in the cylinder piston Cup and restrictive washer mounted on the rod extending from the second end of the cylinder through a seal Assembly in which the cylinder is fixed to the sleeve with an axial projection with the possibility of entering it into the cavity of the Cup when extended from the cylinder stroke position, characterized in that the glass is made in one piece with the piston.

 

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