CN200961696Y - Multiple head cone spiral return line engine oil seal - Google Patents

Abstract

The utility model relates to an oil seal, in particular to a multi-threaded tapered spiral reflux line engine oil seal. The utility model overcomes the difficulties in which a rotating shaft oil seal of the prior art can not satisfy the requirements to improve the sealing effects of the oil seal, to simplify the moulding technology and to enhance the defect of requirement of working efficiency. The utility model comprises a framework, a spring, a sealing lip and a dust-proof lip. The multi-threaded tapered spiral reflux line arranged on the lip portion of the sealing lip adopts a moulding technology to directly press forming on the rubber of the lip portion, which simplifies the moulding method of the reflux line and enhances working efficiency of the oil seal with low cost to achieve better sealing effect.

Description

Bull cone screw return wire engine oil seal

Technical field

The utility model relates to a kind of oil sealing, specifically a kind of bull cone screw return wire engine oil seal.

Background technique

The initial forming method of spiral return wire at the sealing lip lip position of oil sealing is: be molded directly within return wire on the plane of PTFE thin slice by methods such as machinings, after the combination of parts such as skeleton, make the PTFE thin slice tapered by support ring, be arranged on sealing lip lip position, form return wire.This return wire forming method step complexity wastes time and energy, and greatly reduces the manufacturing efficiency of oil sealing, and this forming method seldom uses in present oil sealing is produced.

At present, the forming method that the spiral return wire at the sealing lip lip position of oil sealing is commonly used is: the shape that at first processes the single head helix on the mould plane, then helix is compressed on the PTFE thin slice, and the PTFE and the vulcanization of rubber are integral, but this method is relatively more difficult when processing multi-head spiral type return wire, operation is more, has reduced the manufacturing efficiency of oil sealing.And multi-head spiral type return wire is compared with single head screw type return wire, because the bar number of return wire increases its backflow better effects if.Therefore, the rotary shaft oil seal of prior art can not satisfy the sealing effect that had both improved oil sealing, the requirement of can simplify moulding process again, enhancing productivity simultaneously.

Summary of the invention

The purpose of this utility model is to overcome the defective of prior art, and a kind of bull cone screw return wire engine oil seal is provided, and the return wire moulding at its sealing lip lip position is simple, has improved the manufacturing efficiency of oil sealing, and has improved the sealing effect of oil sealing.

The utility model is to realize like this, a kind of bull cone screw return wire engine oil seal, comprise skeleton, spring, sealing lip and dust excluder lips, wherein, the bull cone screw return wire at sealing lip lip position is to adopt mould pressing process directly compression moulding on the rubber at sealing lip lip position.The section configuration of return wire can be triangle, quadrilateral or trapezoidal etc.

The beneficial effects of the utility model are by adopting the return-flow structure of bull conical helix, to make oil sealing reach the better seal effect, and improved greatly the life-span of body; Owing to adopted the method for direct mold pressing return wire, simplify the forming method of return wire simultaneously, improved the manufacturing efficiency of oil sealing, reduced cost of production.

Description of drawings

Fig. 1 is the structural representation that partly cuts open of the present utility model;

Fig. 2 is the circumference uniform distribution schematic representation of the B of Fig. 1 to the spiral return wire;

Fig. 3 is the A-A rotation partial enlarged drawing of Fig. 1.

Embodiment

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

As shown in Figure 1, wherein 1 is the external sealed body, the 2nd, and skeleton, the 3rd, spring, the 4th, sealing lip, the 5th, dust excluder lips, the 6th, return wire.Return wire 6 adopts the return-flow structure of bull conical helix, as shown in Figure 2.Bull cone screw return wire 6 has used hydrodynamic effect to reach the oil sealing effect, rather than leans on the pressure of oil sealing to come oil sealing merely.Under the effect of bull cone screw return wire 6, axle makes a sea surface oil slick produce a kind of inside vertically thrust in rotary course, thereby has stoped exosmosing of fluid, has realized sealing effect.Under High Temperature High Pressure, utilize mould directly bull cone screw return wire to be compressed on the rubber at sealing lip 4 lip positions, simplified the forming method of return wire.The end surface shape of return wire 6 can be triangle, quadrilateral or trapezoidal etc., as shown in Figure 3.

The utility model bull cone screw return wire engine oil seal, manufacturing process is simple, has improved the manufacturing efficiency of oil sealing; Good sealing effect, and the working life of having improved body can be widely used in the sealing of running shaft classes such as engine crankshaft.

Claims (2)

1, a kind of bull cone screw return wire engine oil seal, comprise skeleton, spring, sealing lip and dust excluder lips, it is characterized in that: the bull cone screw return wire at sealing lip lip position is to adopt mould pressing process directly compression moulding on the rubber at sealing lip lip position.

2, bull cone screw return wire engine oil seal according to claim 1 is characterized in that: the section configuration of return wire can be triangle, quadrilateral or trapezoidal.

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