JPH0587700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an automatic spacing adjustment device for air springs, which maintains a constant spacing between both ends of the air spring, such as height.

Conventional technology For example, Japanese Utility Model Application Publication No. 57-155341 or Japanese Utility Model Application No. 155341
As shown in Publication No. 59-118837, it has a cylindrical telescopic member made of an elastic material such as rubber and a pair of end members that cover both ends of the telescopic member, and from one end member into the telescopic member. An air supply flow path for supplying compressed air is formed, and an exhaust flow path is formed in the other end member, and extends movably from one end member side to the other end member side. If the distance between the members does not reach a predetermined distance, compressed air is supplied from the air supply flow path and the exhaust flow path is closed, and when the distance between the members reaches a predetermined distance, the air supply flow path is closed. 2. Description of the Related Art An automatic spacing adjustment device for air springs is known that has an opening/closing member that opens and maintains an exhaust flow path at a predetermined spacing.

Problems to be Solved by the Invention In such conventional techniques, the opening/closing member is made of metal, and packing is provided at the portions that open and close the exhaust flow path and the air supply flow path, and the opening and closing members are provided with packings that close the exhaust flow path. A helical spring is used for this purpose. Therefore, it has the drawbacks of being very expensive and having a short lifespan.

The present invention provides an automatic spacing adjustment device for air springs that uses an elastic material such as rubber as an opening/closing member, and can be constructed extremely simply and has a long service life.

Means for Solving the Problems The present invention includes a discharge port member that is fixed to one end member and has a discharge port that is connected to an air supply flow path and discharges compressed air into an air spring, and an opening/closing member. ,
The discharge port member has a widened portion formed by a stepped portion near the tip following the elongated portion, and the opening/closing member is made of an elastic material such as rubber and is configured in the shape of a bag with an opening at one end. The opening surrounds the elongated portion and the elongated portion of the ejection port member and is movable, and if the distance between the end members does not reach a predetermined distance, compressed air flows in from the ejection port member. The air spring can then be discharged from the opening, and when a predetermined distance is reached between the end face members, the vicinity of the opening engages with the step to close the air supply flow path. A regulating device is provided.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention shown in the figure, 10 is a cylindrical elastic member made of a rubber-like elastic material such as rubber, which has a space 11 inside and has a pair of rigid end members 12 and 13 at both ends. is blocked by. Reference numeral 14 denotes an air supply flow path provided in the end member 12, to which a flow path member 15 made of a pipe or hose for supplying compressed air is connected. Reference numeral 16 denotes a cylindrical protrusion that protrudes from the end member 12 toward the other end member 13, and has a plurality of air passage holes 17 therein.

Reference numeral 18 denotes an automatic spacing adjustment device that automatically maintains the spacing between the end face members 12 and 13 at a substantially predetermined spacing, and is constructed as described below. That is, reference numeral 19 denotes a discharge port member which is fixed to the center of the end face member 12 by screwing the threaded portion 20 and arranged in the center of the cylindrical protrusion 16 , and has a flow path 21 communicating with the flow path 14 .
A pressing portion 22 having a large diameter presses the packing 23 and is attached airtightly. 25 is an elongated portion extending upward; 26 is a stepped portion having a large diameter enlarged portion 27 at the upper end of the elongated portion;
28 is a discharge port formed at the upper end of the flow path 21. Reference numeral 30 denotes a bag-shaped opening/closing member made of an elastic material such as rubber, which has an opening 31 provided at the lower end surrounding the discharge port and the expanded portion 27 and is slidably fitted to the outside of the elongated portion 25. This opening/closing member is attached to the upper end of the discharge port member 18 by pressing the opening 31 to expand it. 32 is an opening 31 of the opening/closing member 30
A contact surface formed on the inner surface around the upper end of the opening/closing member 30 comes into contact with and engages with the stepped portion 26 of the discharge port member 19 when the opening/closing member 30 rises. 33 is a space formed between the opening and closing member 30 and the upper end of the discharge port member 19, and 35 is a substantially flat upper surface of the opening and closing member 30. Reference numeral 36 denotes an exhaust flow path consisting of a hole drilled through the end member 13 from the upper surface to the lower surface, and the lower part has a small diameter, and the opening 37 at the lower end opens in the lower surface of the end member 13. A protrusion 38 is formed that protrudes downward. The lower surface of the protrusion 38 is normally connected to the opening/closing member 30
The flow path 36 is closed by contacting the upper surface 35 of the space 11, so that the air in the space 11 is prevented from flowing out.

Reference numeral 40 designates a flow path provided in the end face member 12 in order to communicate the inside of the space 11 with an auxiliary tank (not shown) or other air springs arranged adjacently, but this may not be provided in some cases. If necessary, a valve that can open this flow path to the outside atmosphere can be provided for quick exhaustion.

In the configuration as described above, space 1
When compressed air is not supplied to the second
As shown in the figure, the end member 13 is in contact with the cylindrical protrusion 16 of the end member 12, and the opening/closing member 30 is also lowered, and when compressed air is supplied through the flow path 14, the opening/closing member The compressed air flows out into the space 33 of the opening/closing member 30 and increases the pressure, causing the opening/closing member to expand slightly and expand.
7 and the gap between the opening/closing member 30 and the elongated portion 25 and flows into the space 11 . Therefore, as shown in FIG. 3, the end face member 13 starts to move upward, and the opening/closing member 30 also moves upward at the same time because the pressure in the space 33 is higher than that in the space 11. In this case, the lower end opening 37 of the flow path 36 is maintained in a closed state. When the opening/closing member 30 rises and reaches the state shown in FIG.
6 and closes the space between them, compressed air no longer flows into the space 11 from the space 33, and the height of the end face member 13 becomes constant. For example, end member 1
3 is removed or reduced, the end face member 13 rises and the lower end opening 37 of the channel 36 is opened, as shown in FIG. The compressed air flows out into the atmosphere, the end member 13 descends, and the flow path 36 is closed. Furthermore, when the load acting on the end member 13 increases, the end member 13 descends and the opening/closing member 3
0 also descends, compressed air is supplied into the space 11 again, and the end face member 13 reaches a predetermined position. In order to remove the compressed air in the space 11, the flow path 14 should be opened to the atmosphere, and the opening/closing member 3
The space 33 inside 0 also becomes atmospheric pressure, and the action of pressing the lower end opening of the flow path 36 disappears, and the compressed air in the space 11 gradually flows out through this flow path 36, causing the end face member 13 to descend. Become.

In this invention, the opening/closing member 30 is separated from the end member 13 in the state shown in FIG. good.
Alternatively, the end member 12 having the flow path 14 may be arranged upwardly so as to be movable up and down, and the end member 13 may be arranged below at a fixed position, or the expandable member 10 may be arranged so as to be horizontally expandable and contractible. Various changes can be made to the direction of arrangement, such as supporting horizontal loads. Further, the opening/closing member 30 is connected to the discharge port member 1
The diameter of the expanded portion 27 may be slightly larger than that of the expanded portion 27 of No. 9, and a vertical ventilation groove having a small cross-sectional area may be formed on the outer peripheral surface of the expanded portion 27. Further, the opening 31 is also formed to have a larger diameter than the elongated portion 25,
A ventilation groove may be formed in the elongated portion 25 in the vertical direction. Further, the discharge port member 19 may be constructed by combining a plurality of members. Also, the end member 13
If the protruding portion 38 is formed in the upper surface 35 of the ejection port member 19, the area in contact with the upper surface 35 of the ejection port member 19 will be reduced, and the pressing force per unit area exerted by the ejection port member 19 will be increased, resulting in a large sealing effect. 38 may not be formed.

Effects of the Invention As described above, the present invention uses a bag-shaped member made of an elastic material such as rubber as the opening/closing member 30, so it can be manufactured at a cost comparable to that of packing a conventional opening/closing member. There is no need to use a coiled spring, so it can be manufactured at an extremely low cost, and has the advantage of having a longer lifespan.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIGS. 2 to 4 are longitudinal sectional views of main parts showing operating states. 10 is a telescopic member, 12 is an end member, 13 is an end member, 14 is an air supply flow path, 18 is an automatic spacing adjustment device, 19 is a discharge port member, 26 is a stepped portion, 28 is a discharge port, 30 is an opening/closing member , 32 is a contact surface, and 36 is an exhaust flow path.

Claims (1)

[Claims] 1 An air supply flow comprising a cylindrical elastic member made of a rubber-like elastic material and a pair of end members covering both ends of the elastic member, and supplying compressed air from one end member into the elastic member. an exhaust flow path is formed in the other end member;
Extends movably from the one end member side to the other end member side, and when the distance between the end members does not reach a predetermined distance, supplies compressed air from the air supply flow path and closes the exhaust flow path. The air spring automatic spacing adjustment device has an opening/closing member that closes the air supply passage when a predetermined interval is reached, and opens the exhaust air passage when the interval exceeds a predetermined interval to maintain the predetermined interval. The automatic spacing adjustment device includes a discharge port member that is fixed to the one end member and has a discharge port that is connected to the air supply flow path and discharges compressed air into the air spring, and the opening/closing member. The discharge port member has a widened part formed by a stepped part near the tip following the elongated part, and the opening/closing member is made of a rubber-like elastic material and has a bag-like structure with an opening at one end. and surrounds the discharge port and the expanded portion of the discharge port member, and the opening surrounds the elongated portion and is movable;
When the distance between the end face members does not reach a predetermined distance, compressed air flows in from the discharge port member and can be released from the opening, and when the distance between the end face members reaches the predetermined distance, the vicinity of the opening engages with the stepped portion. An automatic spacing adjustment device for air springs, characterized in that the device closes an air supply flow path.