CN87212305U

CN87212305U - Air needle type automatic inflator for tire

Info

Publication number: CN87212305U
Application number: CN 87212305
Authority: CN
Inventors: 徐志祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-09-05
Filing date: 1987-09-05
Publication date: 1988-03-16

Abstract

The utility model discloses an air needle type automatic inflator for a tire, which is an automatic inflating device used for rickshaw tyres and bicycle tyres. The utility model is composed of an air cylinder, a piston, a spring and a sealed ring, etc., replaces the original air needle and has the function of the original air needle and the function of automatic inflating, and has the advantages of small volume, light weight, simple structure, low cost, operational safety and convenience, etc. The utility model does not need a drive component, an operating control connecter and a safe component which controls air pressure, etc., can realize the function of automatic inflating, and can be used for various rickshaw tyres or bicycle tyres.

Description

Air needle type automatic inflator for tire

The utility model belongs to Tire Inflation System, is a kind of snifter that is used for rickshaw, bike tyre.

The tire of bicycle, rickshaw etc. is because natural leak, need often inflate additional so that keep suitable air pressure.At present existing many snifters generally all are to adorn a small-sized cylinder unit on wheel, and the relative motion with vehicle frame when relying on wheel rolling drives piston in the cylinder, compressed air delivery is arrived air tube, thereby realize gas filed purpose.Because this aerator need adopt drive disk assemblies such as gear and cam usually, handle the attaching parts of control and the safety component of control air pressure etc., thereby complex structure, cost is higher, and function and reliability are also not necessarily desirable.

It is a kind of simple in structure, with low cost, easy to use that the purpose of this utility model is to provide, and safe and reliable tire snifter.

The utility model is that the tire touchdown point is compressed distortion and the power that produces promotes the piston acting in the cylinder when utilizing wheel rolling, reaches the purpose to inflation of tire.The profile of this aerator and the size air tube of tire roughly the same are contained in it on the position of original air tube and replace.The utility model is made up of cylinder, piston, spring and seal ring etc., its characteristics are that cylinder and piston adopt the coventional type structure, the profile of cylinder is (6-8) millimeter for the air needle type internal diameter, and wall thickness is (0.7-1.5) millimeter, and length is (30-50) millimeter; Piston and cylinder running-fit, the length of piston rod is according to the specification apolegamy of tire, and an end of piston rod is against on the inwall of tire, and the other end of piston is withstood by compression spring, lives cylinder port with cap again; All adopt the seal ring that can make the air nonreturn flow between tire and the cylinder and between cylinder and the atmosphere.When tire compresses, the jack-up piston motion, spring is compressed, and cylinder is air-breathing; When tire restored, the elastic force of spring made piston motion, and pressurized air when the cylinder internal gas pressure surpasses the tire internal gas pressure, then realizes inflation.Along with air pressure in the tire increases gradually, the distortion of tire touchdown point reduces, and piston stroke is also reduced, and when cylinder air pressure and tire internal gas pressure balance, inflation stops, thereby realizes automatic gas filed purpose.

The utility model is to utilize squeegee action to realize inflation, squeegee action is more little, charge air is few more, just can not stop inflation automatically so do not need to add any auxiliary device,, not need connecting piece and safety component because tire promotes the piston moving linearly, therefore have simple in structure, easy to use and safety, volume is little, in light weight and low cost and other advantages.It can be used on the tire of bicycle or other rickshaw.

Fig. 1 is the generalized section of the utility model structure.

The utility model can take following mode to implement: make the cylinder block that profile is the tire air needle type (8) with copper or other anti-rust metal or alloy, b is 6 millimeters, wall thickness is 1 millimeter, the lower end is fixed on the former air tube position of tire (11), tighten fixing with nut (9), in order to avoid gas leakage, wherein (10) are packing ring.Piston (6) forms running-fit with cylinder block (8), and seal ring (7) is housed above, and piston rod puts in the tire (11); Piston rod can be made of one with piston (6), for easy to process, also can make two; Seal ring (12) is arranged between piston rod and the cylinder port, and seal ring (7) and (12) can be the O RunddichtringO, also can be with the rubber seal or the good plastic seal ring of wear resisting property of special specification.Air inlet (referring to that atmosphere enters cylinder) and exhaust (referring to that cylinder is to the tire pressurized air) device, can make air valve formula, diaphragm type or air needle type (being the unidirectional admission gear of conventional tyre) etc., also can be combined into one with sealing mechanism, for example adopt O type rubber ring, can make simple in structure like this with one-way sealing function.The other end of piston (6) is equipped with compression spring (4), and its intensity can make piston (6) reset in the time of should being controlled at tire (11) sufficient gas; Block (2) is connected with cylinder, cover the upper end of cylinder, block (2) can pass through jump ring (5) fixed position, screw (1) on the block (2) can be used to the pressure of regulating spring (4), so that the anticyclonic pressure of control inflation of tire, middle circular hole on the screw (1) is analogous to the induction opening of common air tube, can be used for common inflator or pump inflates, make aerator have the function of common air tube, unload lower cover cap (2), extract the venting function that piston (6) just can be realized common air tube.Seal ring (3) can be reinforced with rubber or metal piece in the contact site in order to prevent the damage of piston rod to tire (11).In order to reduce piston (6) motion wearing and tearing, when not needing aerator work, can fall back on dotted line position among Fig. 1 to block (2) by jump ring (5), reduce the pressure of spring.When tire (11) has been beared down on one piston (6) upward movement, seal ring (12) sealing, seal ring (7) gas circuit is open-minded, makes atmosphere enter cylinder chamber; When tire (11) restores, compressed spring (4) the compressing piston (6) that is contained in piston (6) one ends resets, seal ring (7) sealing, when the cylinder internal gas pressure surpasses tire (11) internal gas pressure, seal ring (12) is opened, and pressurized air enters in the tire (11), when cylinder internal gas pressure and tire (11) when internal gas pressure is identical, inflation stops, thereby realizes inflation automatically.

Claims

1, a kind of air needle type snifter that is used for inflation of tire, form by cylinder, piston, spring and seal ring etc., it is characterized in that cylinder and piston adopt the coventional type structure, the profile of cylinder is an air needle type, internal diameter is (6-8) millimeter, wall thickness is (0.7-1.5) millimeter, and length is (30-50) millimeter; Piston and cylinder running-fit, the length of piston rod is according to the specification apolegamy of tire, and an end of piston rod is against on the inwall of tire, and the other end of piston is withstood by compression spring, again with covering cylinder port; All adopt the seal ring that can make the air nonreturn flow between tire and the cylinder and between cylinder and the atmosphere.

2, snifter according to claim 1 is characterized in that the lower end of cylinder block (8) is fixed on the former air tube position of tire (11) with nut (9) and packing ring (10), replaces original air tube.

3, snifter according to claim 1 and 2, it is characterized in that seal ring (7) and (12) adopt the O RunddichtringO, with the seal ring or the good plastic seal ring of wear resisting property of special specification.

4, snifter according to claim 1 and 2 is characterized in that air inlet (referring to that atmosphere enters cylinder) and exhaust (referring to that cylinder is to the tire pressurized air) device, makes air valve formula, diaphragm type or air needle type (being the unidirectional admission gear of conventional tyre).

5, snifter according to claim 1 and 2 is characterized in that air inlet and exhaust gear and seal ring (7) and (12) are combined into one, and adopts the O type rubber ring with one-way sealing function.

6, snifter according to claim 5 is characterized in that block (2) is connected with cylinder, covers the upper end of cylinder, and can be fixed on two different positions by jump ring (5).

7, snifter according to claim 6 is characterized in that block has the screw (1) of a regulating spring (4) pressure on (2), has the center hole of the induction opening that is analogous to common air tube on screw (1).

8, snifter according to claim 7 is characterized in that the position that contacts with piston rod in the tire (11) reinforces with rubber or metal piece.