Y type hydraulic seal
Technical field
The utility model belongs to Sealing, is a kind of Y type hydraulic seal specifically.
Background technique
At present the domestic production hydraulic seal be because of will bearing the high pressure of 30Mpa, thus be designed to be with cloth inserted Nitrile Rubber product entirely, the one, bear high pressure with folder cloth, the 2nd, come oil resistant with butyronitrile, but because of Nitrile Rubber not wear-resisting, so life of product is not long always.How to design a kind of hydraulic seal that improves structure, select suitable material, improve wear-resisting property, also want to bear high pressure, this has become the technical task that presses for solution at present.
Summary of the invention
The purpose of this utility model is the deficiency that exists at prior art, and a kind of Y type hydraulic seal is provided, and existing good oil resistant, wear-resisting property can also bear high pressure, increase the service life.Further purpose is to improve sealability.
The purpose of this utility model is achieved by the following technical solution: a kind of Y type hydraulic seal, comprise the annular oil seal body, main lip on the oil seal body comprises epipharynx, outer lip, it is characterized in that: described annular oil seal body is the integrative-structure that polyurethane is made, and the annular oil seal body section is a Y shape.
A sealed muscle has been established in described annular oil seal body inner side surface below.
The inner lip of described annular oil seal body master lip is lower than outer lip.
The utility model compared with prior art has the following advantages and good effect:
1, the utility model Y type hydraulic seal is the integrative-structure that polyurethane is made.Existing good oil resistant, wear-resisting property can also bear high pressure.Utilize the performance of polyurethane, be fit to the abominable Environmental Conditions of operating mode, and long service life.
2, a sealed muscle has been established in the utility model Y type hydraulic seal body inner side surface below.Both allowed the vertical component of oil sealing not touch as far as possible, and allowed them can remain vertically again with being coupling of being sealed, though oil sealing when axle move, produces rub can not change yet oil sealing and spool relative position.
3, the epipharynx of the utility model oil seal body master lip is lower than outer lip.When bearing high pressure, the pressure that epipharynx bears makes epipharynx seize power greater than outer main lip just virtually greater than outer lip pressure like this, guarantees that dynamic axle is consistent with static hole sealability.
Description of drawings
Fig. 1 is the plan view of the utility model Y type hydraulic seal;
Fig. 2 is the plan view of the utility model Y type hydraulic seal;
Fig. 3 is the sectional stereogram of one section Y type of the utility model hydraulic seal.
Embodiment
In conjunction with the accompanying drawings the utility model is described in further detail below by embodiment:
Referring to Fig. 1-Fig. 3, a kind of embodiment of Y type hydraulic seal comprises annular oil seal body 1, and annular oil seal body 1 is the integrative-structure that adopts polyurethane to make, and annular oil seal body 1 cross section is a Y shape.Both oil resistant, wear-resisting can also bear high pressure.
Main lip on the annular oil seal body 1 comprises inner lip 3, outer lip 2, inner lip 2 is lower than outer lip 3, and when bearing high pressure, the pressure that epipharynx bears is just virtually greater than outer lip pressure like this, main lip seize power guarantees that greater than outer main lip dynamic axle is consistent with static hole sealability in making.Below annular oil seal body 1 inner side surface, established a sealed muscle 4, both allowed the vertical component of product not touch as far as possible, allowed them can remain vertically again with being coupling of being sealed, though product when axle move, produces rub can not change yet product and spool relative position.The internal diameter basically identical of annular oil seal body 1 external diameter and closed hole, its matching gap is less than 0.4mm.Guarantee oil sealing like this and will seal die cavity to have a benchmark at least.
Certainly, above-mentioned explanation is not to be to restriction of the present utility model, and the utility model also is not limited to above-mentioned giving an example; those skilled in the art; in essential scope of the present utility model, the variation of making, remodeling, interpolation or replacement all should belong to protection domain of the present utility model.