CN105840831A

CN105840831A - Integrated combination oil seal

Info

Publication number: CN105840831A
Application number: CN201610340434.5A
Authority: CN
Inventors: 温青建; 宋楠
Original assignee: Xian Fast Auto Drive Co Ltd
Current assignee: Xian Fast Auto Drive Co Ltd
Priority date: 2016-05-20
Filing date: 2016-05-20
Publication date: 2016-08-10

Abstract

The invention provides an integrated combination oil seal which is simple in structure, reasonable in design, easy to assemble, good in coaxiality and accurate in location. The oil seal comprises an outer metal framework, an inner metal framework, an inner sealing lip and an outer sealing lip, wherein the outer metal framework and the inner metal framework are arranged in a ring shape, the cross section of the outer metal framework and the cross section of the inner metal framework are in L shapes, and the inner sealing lip and the outer sealing lip are coaxially arranged in sequence in the axial direction. The inner metal framework is buckled into the outer metal framework upside down. The inner sealing lip is clamped and fixed through the outer side of the inner metal framework and the inner side of the inner metal framework. The outer sealing lip is fixed to the edge of the inner side of the outer metal framework. According to the oil seal, by means of the combination of the inner metal framework and the outer metal framework, multiple fixing positions are formed, so that an integrated structure is formed after the inner sealing lip and the outer sealing lip are fixed at the fixing positions correspondingly. As other related parts and the assembling technology are not changed, the oil seal is high in universality and popularization performance and can be installed more conveniently, and locating is more accurate. As the locating basis is set in a unified manner, when the oil seal is assembled on a gearbox, one-time press fitting is achieved, and the coaxiality is excellent.

Description

A kind of integral type combination oil seal

Technical field

The present invention relates to the seal member of rotary shaft, be specially a kind of integral type combination oil seal.

Background technology

Rotary shaft lip seal is called for short oil sealing, refers on the equipment using rotary shaft for sealing liquid Or the mechanical organ of grease, its use on commercial car variator is very extensive, is mainly assemblied in speed change The input and output side of device, will need the parts of lubrication and the parts isolation of input and output in drive disk assembly, Do not allow oil seepage, if oil sealing leaks, the normal work of variator can be affected, time serious Time can cause whole variator saggar, causes each parts badly damaged.

Domestic commercial vehicle variator oil sealing leakage of oil fault rate after sale is higher at present, and main engine plants and my company are all Pay much attention to, listed in quality improvement project of company level, by corporate departments member composition for years Improved project group, improves targetedly from data statistics after sale, the parsing of old part, the analysis of causes, formulation The each side such as measure are carried out and are effectively improved work, combine oil sealing producer, carry out systematic analysis, carry Rise the product structure of oil sealing, reduce PPM after sale.

The applying working condition of domestic commercial vehicle variator is relatively more severe, and oil sealing fault is higher, wherein exports shafting oil Envelope fault is the most prominent, and currently using commonplace is single oil sealing and double oil seal.

The structure of the double oil seal commonly used at present and single oil sealing 10 as depicted in figs. 1 and 2, double oil seal Including inner oil seal 11 and outer oil seal 12, both there is problems in that double oil seal needs twice clamping to cut Lip, after carrying out twice assembling of change speed gear box, axiality is poor；Double oil seal and the lip of single oil sealing and ring flange The magnitude of interference and the power that seizes big, cause local temperature rise excessive, ring flange and oil sealing abrasion ratio are more serious；Double Grease the most manually smeared by oil sealing and single oil sealing, smears uneven, and is sometimes coated with not in place, shadow Ring the lubrication of oil sealing, the most easily cause the dry friction of outer oil seal；Double oil seal height is relatively low, causes lip Open height is limited, when axle beats increase, it is impossible to adequately compensate for；The structure design of double oil seal and single oil sealing Existing defects, fluid splashes and impacts and impurity in case, can be directly to reach at oil seal lip, be to cause leakage of oil The latency of fault；The dirt exclusion capabilities of single oil sealing is limited, and double oil seal major-minor lip is more, and lip friction is produced Raw temperature is of a relatively high, the poor radiation of inner oil seal 11, and oil sealing spot temperature is high, can accelerate lip Aging cracking；If inner oil seal 11 plays sealing function always, outer oil seal 12 is by long-term work Being constantly in dry condition, sealing function not only can be lost, and dry friction also can produce the highest temperature, Promote the rubber premature ageing of oil sealing, and to coordinating rotary shaft to produce serious abrasion.

Summary of the invention

For problems of the prior art, the present invention provides a kind of integral type combination oil seal, structure letter Single, reasonable in design, assembling is simple, and axiality is good, accurate positioning.

The present invention is to be achieved through the following technical solutions:

A kind of integral type combination oil seal, including arranging in the form of a ring and cross section is the outer metal bone of L-type Frame and interior metallic framework, and the interior seal lip that is coaxially disposed the most vertically and external seal lip；In Metallic framework tips upside down in outer metallic framework, and interior seal lip is by outside interior metallic framework and interior metallic framework Inner side adds and fastens, and external seal lip is fixed on the inner side edge of outer metallic framework along upper.

Preferably, the outside of interior seal lip and external seal lip is respectively arranged with self-tightening spring.

Preferably, on the lateral wall of outer metallic framework, cladding arranges oil resistant rubber seal.

Preferably, outer metallic framework is fixedly installed damping sheet near one end of bearing cap, and damping sheet is at axle Upwards can block the space between interior seal lip and outer metallic framework.

Preferably, the inner surface in the close outside of interior seal lip is provided with hydrodynamic groove.

Preferably, the end of the rear surface of external seal lip to inner side extended prominent dust excluder lips.

Compared with prior art, the present invention has a following useful technique effect:

The present invention, by the combination of inside and outside metallic framework, forms multiple fixed position such that it is able to solid respectively Integral structure is formed after fixed inside and outside seal lip, owing to not changing other correlated parts and assembly technology, Therefore versatility and the generalization of product are strong so that it is being more convenient for installing, it is more accurate to position；Due to location base Accurate in unified setting, therefore that during change speed gear box assembling oil sealing, once press-fit, axiality is excellent；Integrally The setting changed can make inside and outside lip configuration more close more easily to the magnitude of interference with seize power and be optimized Reason, enhances the sealing of oil sealing, reduces temperature rise during oil sealing work, and ring flange and oil seal lip The abrasion of mouth；And be capable of machine and be automatically injected grease, prevent the premature wear of oil sealing, also keep away Exempt from the dry friction of outer oil seal.

Further, can effectively be avoided the impact of the internal seal lip of fluid by the damping sheet arranged, In preventing impurity from arriving at seal lip, it is effectively protected interior seal lip so that it is preferably enter simultaneously Row work.

Further, the hydrodynamic groove by arranging carries out oil return so that it is oil return pumping effect is more Good, considerably increase the sealing property of oil sealing.

Further, it is used without the dust excluder lips being connected with self-tightening helical spring self-tightening, prevents from outside The effect that dust invades.

Accompanying drawing explanation

Fig. 1 is the scheme of erection of double oil seal in prior art.

Fig. 2 is the scheme of erection of single oil sealing in prior art.

Fig. 3 is the scheme of erection of integral type combination oil seal described in present example.

Fig. 4 is the structural representation of integral type combination oil seal described in present example.

In figure: 11, outer metallic framework；12, interior metallic framework；2, self-tightening helical spring；3, oil resistant Rubbery sealed body；4, damping sheet；51, interior seal lip；52, external seal lip；6, fluid dynamic Groove；7, dust excluder lips；8, bearing cap；9, integral type combination oil seal；10, single oil sealing；11, interior Oil sealing；12, outer oil seal.

Detailed description of the invention

Below in conjunction with specific embodiment, the present invention is described in further detail, described in be to the present invention Explanation rather than restriction.

One integral type combination oil seal of the present invention, including arranging in the form of a ring and cross section is outside L-type Metallic framework 11 and interior metallic framework 12, and the interior seal lip 51 being coaxially disposed the most vertically With external seal lip 52；Interior metallic framework 12 tip upside down on after in outer metallic framework 11 the most respectively by Two disks, interior seal lip are formed on the bottom of interior metallic framework 12 and the bottom of outer metallic framework 11 51 are added fasten by outside interior metallic frameworks 12 and inside interior metallic framework 12, and external seal lip 52 is solid It is scheduled on the inner side edge of outer metallic framework 11 along upper, is namely fixed on the bottom disc of outer metallic framework 11 On；The connecting portion of interior seal lip 51 is also fixed on the bottom disc of interior metallic framework 12.

Wherein, the outside of interior seal lip 51 and external seal lip 52 is respectively arranged with self-tightening helical spring 2.On the lateral wall of outer metallic framework 11, cladding arranges oil resistant rubber seal 3, with bearing cap 8 interference Coordinating, the disk outer ring bottom outer metallic framework 11 can use full bag or half bag half drain structure.Outer metal Skeleton 11 is fixedly installed damping sheet 4 near one end of bearing cap 8, and damping sheet 4 in the axial direction can Block the space between interior seal lip 51 and outer metallic framework 1.Rear surface in interior seal lip 51 It is provided with hydrodynamic groove 6.The end of the rear surface of external seal lip 52 is extended prominent to inner side The dust excluder lips 7 gone out.

Concrete as it is shown on figure 3, integral type combination oil seal 9 to be press fit into by frock the bearing of variator Lid 8 in, the structure of the present invention a kind of integral type combination oil seal as shown in Figure 4, oil sealing outer ring oil resistant rubber Seal 3 and bearing cap 8 inner ring interference fit, it is ensured that oil sealing is in stationary state, and prevent fluid from Leak or invade between oil sealing outer peripheral face and bearing cap 8 inner peripheral surface, outer metallic framework 11 and interior metal bone Frame 12 combination acts primarily as the effect keeping combining ability, and seal lip 5 is by joining with rotary shaft radial interference Close sealing function, self-tightening helical spring 2 can improve interior seal lip 51 and external seal lip 52 to The thrust of rotary shaft, and act the effect maintaining this thrust, add in the rear surface of interior seal lip 51 Work becomes hydrodynamic groove 6, makes fluid produce dynamic pressure return-flow effect, is greatly improved the sealing of oil sealing Can, damping sheet 4 can effectively be avoided the impact of the internal seal lip of fluid 51, prevent impurity from arriving simultaneously Reach at interior seal lip 51, be effectively protected interior seal lip 51 so that it is be preferably operated, Dust excluder lips 7 is the secondary lip not being connected with spring, acts the effect preventing dust from invading.

Claims

1. an integral type combination oil seal, it is characterised in that include arranging in the form of a ring and cross section is L The outer metallic framework (11) of type and interior metallic framework (12), and be coaxially disposed the most vertically interior Seal lip (51) and external seal lip (52)；Interior metallic framework (12) tips upside down on outer metallic framework (11), in, interior seal lip (51) is by interior metallic framework (12) outside and interior metallic framework (12) Inner side adds and fastens, and external seal lip (52) is fixed on the inner side edge of outer metallic framework (11) along upper.

A kind of integral type combination oil seal the most according to claim 1, it is characterised in that interior sealing lip The outside of mouth (51) and external seal lip (52) is respectively arranged with self-tightening spring (2).

A kind of integral type combination oil seal the most according to claim 1, it is characterised in that outer metal bone On the lateral wall of frame (11), cladding arranges oil resistant rubber seal (3).

A kind of integral type combination oil seal the most according to claim 1, it is characterised in that outer metal bone Frame (11) is fixedly installed damping sheet (4) near one end of bearing cap (8), and damping sheet (4) is at axle Upwards can block the space between interior seal lip (51) and outer metallic framework (11).

A kind of integral type combination oil seal the most according to claim 1, it is characterised in that in interior sealing The inner surface in the close outside of lip (51) is provided with hydrodynamic groove (6).

A kind of integral type combination oil seal the most according to claim 1, it is characterised in that outer seal lip The end of the rear surface of mouth (52) is extended prominent dust excluder lips (7) to inner side.