CN2414257Y

CN2414257Y - Piston H-shape oil sealing device

Info

Publication number: CN2414257Y
Application number: CN 99230339
Authority: CN
Inventors: 苏兆荣; 张相新
Original assignee: Aoyida Hydraulic & Pneumatic Technology Co Ltd Nanjing
Current assignee: Aoyida Hydraulic & Pneumatic Technology Co Ltd Nanjing
Priority date: 1999-12-21
Filing date: 1999-12-21
Publication date: 2001-01-10
Anticipated expiration: 2009-12-21

Abstract

The utility model relates to a piston H-shaped oil sealing device, which belongs to the technical field of piston circumferential sealing in hydraulic transmission. The utility model, which solves the problems of the nonideal sealing, the difficult installation of a sealing element, the short service life, etc. of a current piston, is composed of an annular oil seal, the cross-section of which is H-shaped, a corresponding oil slot on the piston and small oil through holes. The utility model, which is particularly suitable for the reformation of an existing oil cylinder which adopts YX oil sealing, has installation convenience, pressure resistance, shock resistance and good sealing performance.

Description

Piston H type oil-sealing arrangement

The utility model relates to piston annular technical field of sealing technology in the hydraulic transmission.

Hydraulic transmission has energy-efficient; Advantages such as equipment volume is little, the control handiness is flexible, thereby in each row field such as communications and transportation, machinery, use increasingly extensive and universal.Hydraulic jack is again a requisite action actuating mechanism in the hydraulic transmission.Piston oil sealing as oil cylinder is the critical piece and the main easily damaged parts of oil cylinder, and its service behaviour and operating life are the keys of decision oil cylinder working efficiency.Its operating life of YX type oil sealing that generally adopts depends on the rate of wear of oil seal lip and the degree of aging of oil sealing material at present.-but the lip wearing and tearing will lose seal action, and perhaps material ageing follows the string, thereby has destroyed its necessary operating conditions, lets out in will causing, the essential replacing.O type seal ring has simple in structure, withstand voltage height, but easy to wear, the shortcoming of poor flexibility; It is good that the YX oil sealing has a lip elastic packing, but the flimsy shortcoming of lip.

The purpose of this utility model is exactly that a kind of function admirable, long service life, easy for installation, withstand voltage, oil-sealing arrangement that impact resistance is high will be provided, and is suitable for the transformation of most of YX sealed cylinders especially.

The technical solution of the utility model is achieved in that a kind of piston H type oil-sealing arrangement of being made up of oil cylinder 1, piston and oil sealing, be characterized in: the groove that has certain size on the work cylinder of piston 2 near two end faces, groove inside is drilled with the radial hole 4 of certain depth, on the corresponding position of both ends of the surface, have axial aperture 5, both intersect, and interconnect; The two ends lip of the oil sealing 3 among the groove has designed two semi-circular boss 6, and the shape of cross section of oil sealing 3 is a H shape, and its external diameter L equals or be slightly larger than the internal diameter of oil cylinder, and forms cavity 8 with groove.

Because the utility model utilizes the effect of pressure reduction after wearing and tearing or wearing out, the oil sealing warp-wise is expanded be close to casing wall, can also continue to use, so long service life; Owing to designed two semi-circular boss at the two ends of oil sealing, just as in oil sealing, having added two road O type seal rings, add the self sealing action that it is very strong, make it combine the advantage of O type seal ring and YX type oil sealing, avoided their shortcoming, made the withstand voltage of it and impact property improves greatly; Because H type oil seal lip is a circular arc, oil sealing inside is again hollow-core construction, and the leeway of reduced overall distortion is big, so be easy to assembling; Because the width of H type oil sealing is identical with the width of YX oil sealing, just radial thickness greatly-a bit, therefore the original oil cylinder that uses the YX oil sealing can be used H type oil sealing instead, therefore the transformation of very suitable old oil cylinder as long as the oil sealing tank car of piston is dark, after simple processing such as perforating.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the cut-away view of H type oil sealing.

Fig. 2 is the A-A cut-away view of Fig. 1.

Fig. 3 is the utility model user mode schematic representation.

Oil sealing 3 among Fig. 1, Fig. 2 is annular seal circles, has designed two semi-circular boss at its two ends lip, and its slot cross-section is shaped as the H type, and respective groove forms cavity on its inside and the piston.

As can be seen from Figure 3, have groove in the close two end faces of piston 2, oil sealing 3 is closely mounted thereto, in groove inside, have the radial hole 4 of some certain depths, in corresponding endface position, have the axial aperture 5 with parallel to an axis equally, both are connected by interaction.In the starting stage of oil sealing work, because oil sealing boss 6 suffered pretightening forces make it closely contact with casing wall, the seal action when having reached low-pressure state.Along with constantly entering of pressure oil, promote piston to left movement, at this moment, pressure oil also enters axial aperture 5, flow to radial hole 4 and arrive in the cavity 8 that oil sealings 3 and groove form, its pressure is close to the pressure that equals in the oil cylinder, this-effect of normal pressure under, H type oil sealing 3 produces deformation and extends and expands, promptly produce compensating action and make oil sealing outer ring face 7 also be close to casing wall, whole outer ring face 7 and boss 6 are all sealed, groove is close in both sides, the gap disappears, let out in the prevention, as long as in material pressure-bearing scope, and oil pressure is high more, contact pressure is high more, and sealability is also good more.When oil cylinder quit work, pressure disappeared in the inner chamber 8, and oil sealing shrinks, and replied original state.Equally, piston is under the promotion of pressure, and when moving from left to right, automatic compensating action takes place left side H type oil sealing, seals.Seal ring is in the natural relaxation state when off working state, in the time of in working order, rigidity strengthens greatly.

Claims

1 ,-kind of piston H type oil-sealing arrangement, form by oil cylinder (1), piston and oil sealing, it is characterized in that: the groove of opening certain size on the work cylinder of described piston (2) near two end faces, groove inside is drilled with the radial hole (4) of certain depth, on the corresponding position of both ends of the surface, have axial aperture (5), both intersect, and interconnect; The two ends lip of the oil sealing among the groove (3) has designed two semi-circular boss (6), and the shape of cross section of oil sealing (3) is a H shape, and its external diameter L equals or be slightly larger than the internal diameter of oil cylinder, and forms cavity (8) with groove.