JP2006187076A - Output shaft waterproofing structure for waterproof motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure for output shaft, which is more reliable in simple constitution and also is thin and can reduce parts, and is inexpensive and shortens the overall length of a motor. <P>SOLUTION: This structure is made into such seal structure that the pressure elastic force part of the abutment part, against a shaft, of an output shaft part rubber seal is made thin in its diametrical direction and a sealing face against a fixed part is made a face perpendicular to the output shaft and a sliding part is provided with a grease bank, whereby the influence on the accuracy in parts to a seal at a sliding part can be lessened, and the reduction of parts count and man-hours is possible, and a reliable, inexpensive and thin motor, which can withstand a long time of use, can be materialized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a waterproof structure for an output shaft portion used in both air and submerged environments, for example, in an electrical field such as an automobile radiator cooling fan motor.

  In recent years, the usage range of vehicles has expanded and the usage environment on off-road has changed, and it is often used in a submerged environment from a normal flooded environment, and a hermetic seal structure for the output shaft has become necessary, In this operating environment, there are problems such as wear due to foreign matter adhering to the sliding part of the seal of the output shaft due to use in both muddy water and air, and the seal structure used only in water However, there is a problem that it is insufficient for obtaining sufficient reliability, is expensive, and increases the total length of the motor.

  Hereinafter, a conventional waterproof seal structure will be described with reference to the drawings.

As shown in FIGS. 2 and 3, a drain hose for fixing a drain pipe 9 to a breathing hole 8 provided in the bracket 7 after sealing the bracket with the bracket and extending the breathing hole to a portion where the drain pipe 9 is not wetted. 10 is attached, and is submerged in a state where the motor is operated in the air and the temperature of the motor is raised, and a change in the atmospheric pressure in the motor caused by cooling is prevented, and an output shaft 2 in which an oil seal 1 is made of rubber on the output shaft portion. A lip portion 1a that is in contact with the outer periphery, an outer peripheral cylindrical portion 1z that is press-fitted and fixed to an inner cylindrical portion of the oil seal holding cover 11, and a metal fitting 12 for holding pressure input. Grease is applied to the oil seal lip portion 1a. The oil seal holding cover 11 to which the oil seal 1 is attached is attached to the bracket 3 on the output shaft side that abuts the bracket 7 via the seal material 13. Constant, and the mating surface of the oil seal holding cover 11 and the bracket 3, was sealed configuration of the output portion of the sealing member 13 is applied. (For example, see Patent Document 1)
JP-A-9-215621

  However, in the above conventional method, in order to stabilize the pushing force of the oil seal lip portion with the output shaft, it is necessary to ensure the coaxiality between the output shaft and the oil seal lip portion. Coaxiality and the accuracy of coaxiality of the oil seal outer periphery insertion part of the holding cover and the fixing part to the motor bracket are required, and sufficient press-fitting surface length is required to secure the seal between the oil seal outer peripheral part and the holding cover. In addition, there is a problem that the roundness of the joint surface between the metal seal and the outer periphery of the metal seal needs to be ensured, and there are many management items for ensuring quality and the axial direction becomes long.

  In addition, a seal is required between the holding cover for fixing the oil seal and the motor bracket to prevent water from entering, and metal fittings must be inserted into the oil seal to ensure the holding power of the oil seal and the holding cover. There is a problem that the number of parts is large and man-hours are also required.

  Furthermore, since the sliding part between the oil seal lip and the output shaft is only greased, the grease is exhausted when used for a long time, and there is a problem that the oil seal lip cannot be kept airtight due to wear of the oil seal lip. .

  Further, in Japanese Patent Application No. 8-191464, there is a problem that parts accuracy must be ensured in order to equalize the contact pressure with the shaft of the lip portion of the oil seal, and the oil seal fixing portion in the length direction of the shaft. There is a problem that the total length becomes long.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof structure for an output shaft portion that has a simple configuration, is more reliable, is inexpensive, and shortens the overall length of the motor.

  In order to achieve this object, the present invention provides an output shaft rubber seal in which the pressing elastic force of the contact portion with the shaft is configured with a thickness in the radial direction, and the sealing surface with the fixed portion is perpendicular to the output shaft. The main feature is that the seal structure has a surface and a grease reservoir in the sliding part.

  According to the seal structure of the present invention, it is possible to reduce the influence of component accuracy on the seal of the sliding portion, reduce the number of components and man-hours, and provide a highly reliable, inexpensive and thin motor that can withstand long-term use. realizable.

  The invention according to claim 1 of the present invention has an armature wound on a flat surface and molded with resin, and is opposed to the magnet fixed to a bracket having a bearing holding portion in the axial direction via the armature. It is composed of a bracket having another bearing holding part joined to the bracket at the mating surface, and a sealing material is applied to the mating surface of the bracket, and there is a pipe / hose that passes through the inside of the bracket and moves air. In the submerged specification flat motor, the output shaft side bracket is in contact with the rotation sliding portion of the output shaft, the output shaft penetrating hole inlay portion of the bearing housing of the output shaft side bracket, and is pressed against the end surface of the bearing housing. A rubber seal that is fixed to the bearing housing with a cup-shaped presser plate having a hole in the bottom surface and that has a grease reservoir at the output shaft contact portion. This is a single flat motor, and the pressing elastic force of the contact part with the output shaft of the rubber seal is given by the thickness in the radial direction, so that no insert metal fitting in the rubber seal is required, and the fixed part of the rubber seal is used as the output shaft. By making it a right angle surface, the influence of component accuracy on the pressing force of the contact portion with the output shaft can be reduced, and the fixed side of the rubber seal is pressed and fixed to the bearing housing with a cup-shaped presser plate. The seal material between the housing and the cup-shaped presser plate can be eliminated, and a thin and stable fixing portion can be realized, and a grease reservoir is provided in the rubber seal of the output shaft sliding portion. In addition, it is possible to prevent wear of the sliding portion and to prevent foreign matters from adhering to the sliding portion, thereby providing a stable and highly reliable seal structure.

  According to a second aspect of the present invention, in the seal output shaft portion structure according to the first aspect of the present invention, the rubber seal has at least two rotating shaft sliding portion abutting portions, and a concave portion of the non-sliding portion is provided between them. It has a seal structure characterized in that this recess is filled with grease, and a grease retaining part is constituted by a double abutting part, and the seal of the sliding part is stabilized, and the external side Even if water or a foreign substance enters from the seal contact portion, it can be prevented from entering the inner seal contact portion by being mixed into the grease in the recess.

  The invention according to claim 3 is the seal output shaft part structure according to claim 1, wherein the rubber seal has at least one hole penetrating the recess and the output shaft side end surface, and grease is filled from the hole, A seal structure in which the through hole is closed by the bottom surface of a cup-shaped part press-fitted and fixed to the bearing housing, and a stable amount of grease can be maintained in the recess by injecting grease from the hole on the output shaft side end surface. The grease pressure from the recess can prevent water and foreign matter from entering from the outside.

  According to a fourth aspect of the present invention, in the seal output shaft portion structure according to the first aspect, the shape connecting the concave portion of the rubber seal and the output shaft contact portion of the rubber seal on the output shaft side is an output shaft contact. It is a rubber seal structure arranged in the direction spreading to the part, and the grease pressure in the concave part is concentrated on the output part contact part, and the pressure to the outside can be maintained, so that intrusion of water, foreign matters, etc. from the outside can be prevented.

  According to a fifth aspect of the present invention, in the seal output shaft portion structure according to the first aspect, the output shaft located in the concave portion of the rubber seal has a groove in a direction delayed from the inside of the motor toward the outside with respect to the rotational direction. The output shaft structure of the rubber seal is configured such that the grease moves along the side wall of the output groove by the rotation of the output shaft, and the grease is forcibly supplied to the output shaft contact portion of the rubber seal. The contact portion sealability can be improved, sliding can be smoothed and wear can be prevented.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross-sectional view of the output shaft seal structure of the present invention. As shown in FIG. 1, the rubber seal 1 includes a lip portion 1 a that abuts the output shaft 2, a recess 1 b on the opposite side of the lip portion 1 a, and a through-hole for the output shaft 2 of the bearing housing 3 a that is configured by the bracket 3. The insertion portion 1c is looser than the fitting between the output shaft 2 and the lip portion 1a, and the flat portion 1d is in contact with the end surface of the housing 3a perpendicular to the insertion portion 1c. 4, the presser plate 5 is press-fitted and fixed to the outer diameter of the housing 3a in a state where the flat surface portion 1d of the rubber seal 1 is pressurized with a presser plate 5 provided with a hole in the bottom surface.

  The lip portion of the rubber seal 1 has a lip portion 1a and two lip portions 1e which are in contact with the output shaft 2 via the recess 1b inside the motor from the lip portion 1a and have a sliding portion with the output shaft. It is sealed.

  The lip 1a is composed of an inclined surface that extends from the recess 1b toward the outside of the motor, and is composed of a recess 1b, a flat surface 1d that is in contact with the bottom surface of the pressing plate 5 of the rubber seal 1, and a through hole 1f that passes therethrough.

  6 is a groove for supplying grease, which is provided in a direction delayed from the inside of the motor toward the outside with respect to the rotation direction of the output shaft 2.

  As described above, since the clearance is provided in the radial direction of the insertion portion 1c of the rubber seal 1 and the fixed-side seal is secured by the compression of the flat portion 1d contacting the end surface of the housing 3a, By filling the recess 1b of the rubber seal 1 with grease 4 and mounting only the rubber seal 1, the pressing force of the lip 1a against the output shaft 2 is determined only by the outer diameter of the output shaft 2 and the inner diameter of the lip 1a. Thin, stable pressing force and uniform pressing force in all radial directions can be secured, and the lubrication of the sliding part can be ensured for a long time by the grease 4, and the sliding part by the entry of foreign matter from the outside Can be prevented from adhering to. Further, since the seal on the fixed side of the rubber seal 1 is constituted by the end surface of the housing 3a, the flat surface portion 1d of the rubber seal can be pressure-fixed on the bottom surface of the cup-shaped presser plate 5 provided with a hole on the bottom surface. Since the pressing elastic force of the lip portion 1a is made thick in the radial direction, a rigid body such as a metal fitting is not required, and the number of parts and the number of mounting steps can be reduced.

  The lip portions 1a and 1e are provided at two locations via the concave portion 1b of the rubber seal 1, and the concave portion 1b is filled with grease 4, thereby preventing grease leakage and double sealing against intrusion from the outside. Is possible.

  In addition, grease is injected from the through hole 1f of the rubber seal 1 and closed by the presser plate 5, the recess 1b is filled with grease, and the lip 1a is inclined, so that pressure from the outside such as fountain is applied. Also, it is possible to prevent a decrease in pressure contact force of the lip portion with the output shaft.

  Furthermore, the grease supply groove 6 is provided in the output shaft 2 at the position of the concave portion 1b of the rubber seal 1, so that the grease can be supplied to the lip portion 1a with the pressure generated by the rotation of the motor, and stable sliding is achieved. Can be secured and the sealing performance can be improved.

  INDUSTRIAL APPLICABILITY The present invention is useful as a waterproof structure for an output shaft portion used in both air and submerged environments, for example, in the electrical equipment field such as an automobile radiator cooling fan motor.

Sectional drawing of the output shaft part seal structure in one Example of this invention Conventional motor structure Partial sectional view of a conventional output shaft seal structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber seal 1a Lip part 1b Concave part 1c Insertion part 1d Flat part 1e Lip part 1f Through hole 1z Cylindrical part 2 Output shaft 3 Bracket 3a Bearing housing 4 Grease 5 Holding plate 6 Grease supply groove 7 Bracket 8 Breathing hole 9 Drain pipe 10 Drain hose 11 Oil seal holding cover 12 Metal fitting 13 Seal material

Claims (5)

The other bearing which has an armature wound on a flat surface and molded with resin, and which is joined to a bracket fixed to a bracket having a bearing holding portion in the axial direction and the bracket facing each other via the armature In a submerged flat motor that has a pipe / hose that consists of a bracket with a holding portion, a sealant is applied to the mating surface of the bracket, and one bracket passes through the inside and moves air. The output shaft side bracket has an output shaft penetrating hole inlay portion in contact with the rotary sliding portion, and a hole is provided on the bottom surface in a state of being pressed against the end surface of the bearing housing. A flat motor provided with a rubber seal fixed to the bearing housing by a cup-shaped presser plate and having a grease reservoir at the output shaft contact portion. 2. The flat motor according to claim 1, wherein there are at least two sliding contact portions of the rotating shaft portion of the rubber seal, and a concave portion of the non-sliding portion is provided between them, and the concave portion is filled with grease. Flat motor with seal structure. 2. The flat motor according to claim 1, wherein the cup has at least one hole penetrating the concave portion of the rubber seal and the end surface on the output shaft side, is filled with grease from the hole, and the through hole is press-fitted and fixed to the bearing housing. A flat motor with a sealed structure closed at the bottom of the shaped part. 2. The flat motor according to claim 1, wherein a shape connecting the concave portion of the rubber seal and the output shaft contact portion of the rubber seal on the output shaft side is arranged in a direction extending to the output shaft contact portion. 2. The flat motor according to claim 1, wherein the output shaft located in the recess of the rubber seal has a groove in a direction delayed from the inside of the motor toward the outside with respect to the rotation direction.

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