CN2252128Y

CN2252128Y - Damper with floating pump supply air

Info

Publication number: CN2252128Y
Application number: CN 96202765
Authority: CN
Inventors: 张方
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-01-23
Filing date: 1996-01-23
Publication date: 1997-04-16
Anticipated expiration: 2006-01-23

Abstract

The utility model relates to a damper, which is mainly suitable for vehicles. The existing damper with a floating pump for supplying air has the defects of easy failure, fixing air pressure and large loss of lubricating oil. The utility model is characterized in that a pressure chamber is arranged on the lower part of a piston; an unlimited pressure valve is provided with a height limiting hole on the upper part of an air pump casing; because the pressure chamber is arranged on the lower part, the cylinder wall on the upper part of the piston is attached with the lubricating oil carried away continuously with a piston ring; the cylinder wall is kept with an amount of the lubricating oil forever. Because a pressure limiting valve is canceled, the lubricating oil can not be carried away from a cylinder sleeve. Because the height limiting hole is additionally arranged, when the height of the pressure chamber is lifted to a certain degree, the inhalation stops to make the air pressure be suitable for the requirements of different self-weight and load-carrying vehicles.

Description

Bumper with the Floating bottom pump air feed

The utility model is a kind of bumper, mainly is applicable to vehicle.

Floating bottom pump is a prior art, is 93202298.7 as application number, and name is called the concrete structure of just having announced several embodiment of Floating bottom pump in the patent application document of " Floating bottom pump ".Application number is that the Chinese patent application file of 89206921.X has been announced a kind of " assembling the compressed-air actuated bumper of confession ", it is owing to make bumper with the Floating bottom pump air feed, therefore the stroke of piston and upper and lower stop can be with by the amplitude sizes of damping thing and automatic compensation changes, avoid gaseous tension deficiency or pump at the bottom of, piston damages because of knock against each other; And can all discharge the former gas that is drawn into because of each piston moves down, noresidue gas, so nothing " saturating point ".But have following shortcoming: 1, the pressure chamber is above piston, and when piston moved down, the oil film between sealing member and casing wall air pressure by compression moved down with piston.When piston rises, oil film with the amount of moving on the sealing member less than the amount of moving down.Though residual quantity is little, take care of the pence, make the loss of lubrication on the casing wall, finally make defective shock absorber.2, limit and press the required pressure of valve regulation, constant once setting up, can not adapt to the air pressure requirement of different deadweights and load-carrying vehicle automatically; And during the discharging of limiting valve superpressure, lubricating oil can be taken out of by gas.

The purpose of this utility model provides a kind of long service life, dependable performance, and loss of lubrication is small, and air pressure can adapt to bumper different deadweights and load-carrying vehicle requirement, that use the Floating bottom pump air feed automatically.

The utility model also includes air pump shell, pressure chamber, oil return pipe, non-return valve, piston, piston ring, piston rod, cylinder sleeve, it is characterized in that the pressure chamber is located at piston below, bumper is not established limiting valve and is had a limit for height hole on the top of air pump shell or have a plurality of limits for height hole at sustained height.Because the pressure chamber is in the bottom, the lubricating oil of constantly taking out of with piston ring (sealing member) is attached to the casing wall of piston top.When Floating bottom pump was bled, oil was in oil return pipe enters Floating bottom pump.Maintain an amount of lubricating oil on the casing wall forever.Owing to cancelled limiting valve, lubricating oil can not taken out of outside the cylinder sleeve.Owing to set up the limit for height hole, when rising to a certain degree (to concordant with the limit for height hole), pressure chamber's height just stops suction, and can make air pressure can adapt to different deadweights and load-carrying vehicle requirement.

Compare with the bumper of Floating bottom pump air feed with existing, the utility model has the advantages that long service life, dependable performance, loss of lubrication is small, and air pressure can adapt to the vehicle requirement of different deadweights and load-carrying.

Accompanying drawing is looked cross-sectional view for the local embodiment master who amplifies of band.

Embodiment: be a car chassis gas buffer, detailed structure is seen accompanying drawing.In the cylinder sleeve 23 is piston rod 12, is air pump shell 22 in the piston rod 12, and the pump rod 5 of a hollow is arranged in the air pump shell 22, and an air pump piston 11 is arranged at the bottom of pump rod 5.Spring 24 and steel ball 10 are arranged in the air pump piston 11, and they constitute non-return valve, and the air pump gum cover 9 that is enclosed within pump rod 5 lower ends also constitutes non-return valve.The bottom of air pump piston 11 V that has living space.Non-return valve communicates with V in the air pump piston 11.The oil return pipe 7 of taking back oil pipe lower adaptor 8 and top connection 6 makes the inner chamber of cylinder sleeve 23 be communicated with the cavity of pump rod 5.The lower end of piston rod 12 is fastened with piston 15.17 is piston ring.The below of piston 15 is can be along the oil storage dish 18 of vertical lifting of air pump shell 22.The below of oil storage dish 18 is the V ' of pressure chamber.One current limliting non-return valve 19 is arranged between V ' of pressure chamber and the SPACE V.1 is link among the figure, and 2 is hinge axis, and 3 is the hinge cover, and 4 is upper end cover, and 13 is cover of dust, and 14 is terminal cover, and 16 is the piston rubber cushion.20 is plug, and 21 is bottom end cover.The top of air pump shell 22 has a limit for height hole 25.There is through hole that oil return pipe 4 is communicated with the pump rod 5 of hollow in the upper end cover 4.

The working process of embodiment is: when dip, when moving on the piston rod 12, SPACE V increases, the V internal gas pressure is lower than barometric pressure, atmosphere enters V through the non-return valve that oil return pipe 7, hollow pump rod 5, spring 24 steel balls 10 constitute.Road surface epirelief, piston rod 12 move down, and SPACE V reduces, and gas is compressed in the V, and its pressure is higher than V ' internal gas pressure, and pressure gas flows into the space of 12 of pump rods 5 and piston rods, the 26 feed pressure chamber V ' of the draining hole on oil storage dish 18 again through gum cover 9.So circulation is carried out, and V ' internal gas pressure constantly raises, and oil storage dish 18 rises, and piston 15 moves on also.When moving on the piston rod 12, the oil of V ' bottom enters V through current limliting non-return valve 19, and the oil level in the V rises gradually, but piston 11 is also with moving on the piston rod 12, so the bottom surface of piston 11 is to the no big variation of distance of pasta.Still the gas compression in the V to pressure can be higher than the air pressure in the V ' when piston rod 12 moves down, the gas in the V flows in the V ' in the same old way.When the stroke of piston rod 12 greater than the bottom surface of air pump piston 11 to pasta apart from the time, the motion stop of air pump piston 11 bottom surfaces will be lower than pasta.Gas in the V flows in the V ' through gum cover 9 with oil, finishes circulation of the oil and pump gas, realizes that stop changes.Owing to have oil film between piston ring 17 and the cylinder sleeve 23, each motion all stays less amount of lubrication oil above piston ring 17.Piston ring 17 ceaselessly moves with piston rod 12, and the oil of piston ring 17 tops takes care of the pence, and when oil mass expired the import of oil return pipe lower adaptor 8, during the oil return pipe air inlet, lubricating oil also entered in the V in the lump.The oil of piston ring 17 tops overflows outside the cylinder sleeve 23 never.Oil with gas is discharged through gum cover 9 lodges in earlier on the oil storage dish 18, and when pasta surpassed the height in the draining hole 26 on the oil storage dish 18, oil is 26 inflow V ' from the draining hole.The oil outlet 27 of remaining oil in oil storage dish 18 flow to piston ring 17 belows, supplies piston ring 17 with lubricating oil.Pellets shot from a slingshot below in the current limliting non-return valve 19 play metering function, when oil when fuel feed hole flows into, this pellet shot from a slingshot is brought to the top, oil outlet is blocked, do not allow in a large amount of V of inflow of oil.The pellet shot from a slingshot of top plays fuel-displaced non-return effect in the current limliting non-return valve 19.

Claims

1, a kind of bumper with the Floating bottom pump air feed, include air pump shell, pressure chamber, oil return pipe, non-return valve, piston, piston ring, piston rod, cylinder sleeve, it is characterized in that the pressure chamber is located at piston below, bumper is not established limiting valve and is had a limit for height hole on the top of air pump shell or have a plurality of limits for height hole at sustained height.

2, as the said bumper of claim 1, it is characterized in that: be piston rod (12) in the cylinder sleeve (23), in the piston rod (12) is air pump shell (22), the pump rod (5) that one hollow is arranged in the air pump shell (22), one air pump piston (11) is arranged at the bottom of pump rod (5), spring (24) and steel ball (10) are arranged in the air pump piston (11), they constitute non-return valve, the air pump gum cover (9) that is enclosed within pump rod (5) lower end also constitutes non-return valve, the bottom of air pump piston (11) V that has living space, the interior non-return valve of air pump piston (11) communicates with SPACE V, the oil return pipe (7) of taking back oil pipe lower adaptor (8) and top connection (6) makes the inner chamber of cylinder sleeve (23) be communicated with the cavity of pump rod (5), the lower end of piston rod (12) is fastened with piston (15), the below of piston (15) is can be along the oil storage dish (18) of vertical lifting of air pump shell (22), the below of oil storage dish (18) is the V ' of pressure chamber, one current limliting non-return valve (19) is arranged between V ' of pressure chamber and the SPACE V, draining hole (26) is arranged on the oil storage dish (18), and the oil storage dish has oil outlet 27 in (18).