CN203335871U

CN203335871U - Dustproof ring

Info

Publication number: CN203335871U
Application number: CN2013203348898U
Authority: CN
Inventors: 徐卫平
Original assignee: Guangzhou Mechanical Engineering Research Institute Co Ltd
Current assignee: Guangzhou Mechanical Engineering Research Institute Co Ltd
Priority date: 2013-06-09
Filing date: 2013-06-09
Publication date: 2013-12-11
Anticipated expiration: 2023-06-09

Abstract

The utility model discloses a dustproof ring. An annular boss is arranged at the root portion of the inner circle face of the dustproof ring. An inner lip is arranged on the inner circle surface of the dustproof ring. An outer lip is arranged on the outer circle surface of the dustproof ring. The outer lip is in interference fit with the inner wall of a groove. The outer lip and the groove are assembled in a compressing mode. The inner lip and the outer lip form a Y-shaped structure, and a V-shaped groove is formed between the inner lip and the outer lip. According to the dustproof ring, the annular boss which is arranged at the root portion of the inner circle face is in firm contact with a piston cylinder, and dustproof ring side turning phenomena are effectively avoided. In addition, the outer lip which is arranged on the outer circle surface of the dustproof ring can be in interference fit with the inner wall of the groove, size changing caused by temperature changing of the dustproof ring is completely compensated, and accordingly external fluid, impurities and the like are effectively prevented from entering a cylinder, and whole service life of the hydraulic cylinder is prolonged.

Description

A kind of dust ring

Technical field

The utility model relates to a kind of sealing technique, is specifically related to a kind of dust ring.

Background technique

In existing hydraulic system, the factor that affects oil hydraulic cylinder working life is a lot, wherein, the inefficacy of dust ring is more common and crucial factor, the dust ring inefficacy can cause extraneous water, dust, impurity etc. to enter in cylinder, scratch or wearing and tearing seal ring, guide ring, piston rod, cylinder barrel etc., cause working medium to leak, hydraulic system is contaminated, oil hydraulic cylinder and valve damages, oil hydraulic cylinder can't work.

Existing for the dust ring on hydraulic cylinder piston rod, as shown in Figure 1, outer round surface 10 is attachment face, and, on piston rod, there is gap in inner circle upper surface 30 bandings between inner circle lower surface 20 and piston rod.This kind of structure is unstable because the inner headed face root contacts with piston rod, has the rollover phenomenon, in addition, the rubber-plastics material linear expansion coefficient is larger, when low temperature, due to the dust ring dimensional changes, easily make to have gap between outer round surface and trench wall, cause extraneous fluid, impurity etc. to enter in cylinder.

The model utility content

The purpose of this utility model is to overcome the shortcoming of prior art with not enough, and a kind of simple in structure, stability is high and water proof and dust proof is effective dust ring is provided.

The purpose of this utility model is achieved through the following technical solutions: a kind of dust ring, described dust ring inner headed face root is provided with annular boss, described dust ring internal circular surfaces is provided with epipharynx, described dust ring outer round surface is provided with outer lip, described outer lip and trench wall interference fit, described outer lip and groove compression assembling; Be provided with magnitude of interference between described outer lip and epipharynx and form the structure of a Y shape, a V-shaped groove is arranged between described outer lip and epipharynx.

Preferably, the annular boss arranged on described dust ring inner headed face root is whole ring type.

Further, the sectional shape of described annular boss is trapezoidal, rectangle or circular arc.

Preferably, the annular boss arranged on described dust ring inner headed face root is equally distributed multistage.

Further, the sectional shape of described annular boss is trapezoidal, rectangle or annular.

Preferably, described annular boss internal circular surfaces and piston rod surface concentric, annular boss and piston rod transition fit.

Preferably, described outer lip end face is parallel with the dust ring bottom surface.

Preferably, the lip of described outer lip and epipharynx opens to the hydraulic cylinder port direction.

Preferably, described dust ring is ring.

Preferably, the making material of described dust ring is polyurethane material or rubber-plastics material.

The utility model has following advantage and effect with respect to prior art:

(1) annular boss of the utility model dust ring inner headed face root setting firmly contacts with piston rod, has effectively avoided dust ring the phenomenon of turning on one's side in use to occur, and has improved the stability of the utility model dust ring.

(2) outer lip of the utility model dust ring outer round surface setting can be realized and the trench wall interference fit, can fully compensate the dimensional changes that dust ring itself produces because of temperature variation, thereby effectively prevent that extraneous fluid, impurity etc. from entering in cylinder, damage seal ring, director element, piston rod and piston cylinder inwall, improve the dustproof and waterproof effect of dust ring, thereby extended the whole service life of oil hydraulic cylinder; The utility model dust ring applying working condition scope is wider.

The accompanying drawing explanation

Fig. 1 is the sectional structure schematic diagram of traditional dust ring.

Fig. 2 is the sectional structure schematic diagram of the utility model dust ring, and wherein the annular boss of dust ring inner circle root is whole ring type, and the cross section of annular boss is trapezoidal.

Fig. 3 is the dust ring plan view of Fig. 2.

Fig. 4 is the partial enlarged drawing of the annular boss (rectangular cross-section) of Fig. 2.

Fig. 5 is the partial enlarged drawing of the annular boss (circular section) of Fig. 2

Fig. 6 is the sectional structure schematic diagram of the utility model dust ring, and wherein annular boss is segmented.

Fig. 7 is the dust ring plan view of Fig. 6.

Fig. 8 is the partial enlarged drawing of Fig. 6 annular boss (rectangular cross-section).

Fig. 9 is the partial enlarged drawing of Fig. 6 annular boss (triangular-section).

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but mode of execution of the present utility model is not limited to this.

Embodiment 1

As shown in Figures 2 and 3, the present embodiment discloses a kind of dust ring, and wherein the dust ring of the present embodiment is ring.Dust ring inner headed face root is provided with the annular boss 3 of whole ring type; As shown in Figure 2, in the present embodiment, the sectional shape of annular boss 3 is trapezoidal, can be also rectangle or circular arc as shown in Figures 4 and 5.Annular boss 3 internal circular surfaces and piston rod surface concentric, annular boss and piston rod transition fit, make annular boss 3 and piston rod be close to, and effectively avoided the rollover phenomenon.

The dust ring internal circular surfaces is provided with epipharynx 4, and the dust ring outer round surface is provided with outer lip 1, is provided with magnitude of interference between epipharynx 4 and outer lip 1 and forms the structure of a Y shape, forms a V-shaped groove therebetween, is conducive to the adjusting of outer lip and trench wall assembling post gap.Wherein epipharynx 4 opens to the hydraulic cylinder port direction with the lip of outer lip 1.Outer lip 1 and groove compression assembling, outer lip 1 and trench wall interference fit, outer lip end face 2 is parallel with the dust ring bottom surface, has fully compensated the dimensional changes that dust ring itself produces because of temperature variation.

The making material of the dust ring of the present embodiment is for having the high-strength polyurethane material, and polyurethane material has the characteristics such as wear-resisting, water-fast.Also can replace with rubber-plastics material.

Embodiment 2

As shown in Figures 6 and 7, the present embodiment difference from Example 1 is: the annular boss 3 arranged on the dust ring inner headed face is equally distributed multistage, every section annular boss 3 evenly is arranged on dust ring inner headed face root, wherein the sectional shape of the annular boss in the present embodiment 3 is annular as shown in Figure 6, can be also trapezoidal or triangle as shown in FIG. 8 and 9.

Above-described embodiment is preferably mode of execution of the utility model; but mode of execution of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.

Claims

1. a dust ring, is characterized in that, described dust ring inner headed face root is provided with annular boss, described dust ring internal circular surfaces is provided with epipharynx, described dust ring outer round surface is provided with outer lip, described outer lip and trench wall interference fit, described outer lip and groove compression assembling; Be provided with magnitude of interference between described outer lip and epipharynx and form the structure of a Y shape, a V-shaped groove is arranged between described outer lip and epipharynx.

2. dust ring according to claim 1, is characterized in that, the annular boss arranged on described dust ring inner headed face root is whole ring type.

3. dust ring according to claim 2, is characterized in that, the sectional shape of described annular boss is trapezoidal, rectangle or circular arc.

4. dust ring according to claim 1, is characterized in that, the annular boss arranged on described dust ring inner headed face root is equally distributed multistage.

5. dust ring according to claim 4, is characterized in that, the sectional shape of described annular boss is trapezoidal, rectangle or annular.

6. dust ring according to claim 1, is characterized in that, described annular boss internal circular surfaces and piston rod surface concentric, annular boss and piston rod transition fit.

7. dust ring according to claim 1, is characterized in that, described outer lip end face is parallel with the dust ring bottom surface.

8. dust ring according to claim 1, is characterized in that, the lip of described outer lip and epipharynx opens to the hydraulic cylinder port direction.

9. dust ring according to claim 1, is characterized in that, described dust ring is ring.

10. dust ring according to claim 1, is characterized in that, the making material of described dust ring is polyurethane material or rubber-plastics material.