JP3602954B2 - Bearing seal for water pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hermetic seal mounted on a bearing for a water pump to exert a sealing action, and more particularly to a set seal type bearing seal combining a seal member and a slinger.
[0002]
[Prior art]
Conventionally, as a bearing seal for sealing a shaft and a housing of this kind of water pump, a bearing seal device as disclosed in Japanese Utility Model Laid-Open No. 3-77093 is known.
The structure of this bearing seal device will be described in detail with reference to the drawings. As shown in FIG. 5, the bearing seal device is fitted and fixed to an outer ring side seal ring (51) having a plurality of lips (5) and a shaft (2). The lip (5) is constituted by a shaft-side seal ring (6) with which the lip (5) slides, and the shaft-side seal ring (6) extends in the axial direction to the first cylindrical portion (61) and the outer diameter side thereof. And a main lip (5a) of the outer ring side seal ring (51) is in contact with an outer peripheral surface of the first cylindrical portion (61) of the shaft side seal ring (6). The lip (5b) has a structure in which the lip (5b) is in contact or non-contact with the outer peripheral surface of the second cylindrical portion (62) of the shaft side seal ring (6).
[0003]
[Problems to be solved by the invention]
However, in a sealing device in which a plurality of lips (a main lip 5a and a sub lip 5b) of this kind are all in contact with and slide on a mating shaft-side seal ring (6), the shaft-side seal ring (6) is used. All of the sealing safety is bet on the mating surface with the shaft (2) which is the mounting part of the shaft, and the shaft side seal ring (6) is poorly fitted, loosened due to aging or heat change, and further replaced. It has a structure that is extremely disadvantageous against contact surface roughness such as replacement.
That is, the fixing structure between the shaft-side seal ring (6) and the shaft (2) is formed by fitting two members as shown in FIG. 2, and is usually formed of a material such as metal which is difficult to obtain high sealing performance. In addition to the need for high precision in the dimensions of the fitting portion of the two members, the smoothness of the peripheral surface is also required, and the mounting must be performed through an accurate press-fitting process without inclination.
[0004]
The present invention eliminates many of these drawbacks that must be solved, and provides an inexpensive water pump seal having high sealing safety and excellent mounting workability by changing the arrangement and combination of a plurality of seal members. It is an object.
[0005]
[Means to solve the problem]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. As shown in FIG. 1, a water pump bearing is interposed between a housing of a water pump and a shaft (2) having an impeller. The bearing seal for a water pump includes a sealing lip (3) made of an elastic material such as a synthetic rubber or a synthetic resin and a reinforcing ring (32) for reinforcing the sealing lip to enhance the fixing force. a sealing member (31), and a slinger (4) of a substantially crank shape made of metal, the said shaft two radial lip (3a) as a sealing lip (3) (2) inner and outer navel with contacts disposed opposition towards, and caused to protrude obliquely radially inner side downward side lip (3b) from the body portion of the sealing member (31), said Bearin Fitted to the shaft of the axially outward of the seal (2), having an axial portion which enters into the gap between the outer peripheral surface thereof is in sliding contact with the side lip (3b) wherein one of the radial lip (3a) slinger ( 4) is arranged.
The slinger (4) is fitted to the axially outer shaft (2) of the bearing seal, the tip of the slinger is inclined toward the inner diameter side, and the outer peripheral surface of the slinger slides against the side lip (3b). Characterized in that a slinger (4) having an axial portion that enters the gap with the radial lip (3a) is arranged.
[0006]
In the water pump bearing seal, as shown in FIGS. 3 and 4, the water pump bearing seal includes a seal member (3) including a seal lip (3) made of an elastic body and a reinforcing ring (32) for reinforcing the seal lip (3). 31) and a substantially crank-shaped slinger (4) composed of a metal ring. The seal member (31) has two radial lips (3a) as seal lips (3) inside and outside the bearing shaft (2). with contacts disposed opposition outside, the side lip (3b) protrudes disposed from the body portion diagonally inner diameter side outward, fitted to the shaft (2) of the outward from the sealing member (31), The tip has a stepped shape (42) with a wide cross section, and the outer peripheral surface of the tip is in sliding contact with the side lip (3b) and enters the gap with the one radial lip (3a). Is characterized in that allowed placing slinger (4) having a.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
As described above, the present invention is a bearing seal for shutting off a bearing of a water pump from cooling water leaking from a mechanical seal, and includes a seal member (31) including a plurality of radial lips (3a) and side lips (3b). And a slinger (4) having an axial portion. The radial lip (3a) of the seal member (31) comes into contact with the shaft (2), and the side lip (3) is wrapped around the shaft (2). 3b) comes into sliding contact with the slinger (4) to obtain a good sealing action.
That is, the slinger (4) has a substantially crank-shaped cross section as shown in FIG. 1, and the tip of the axially rising part inclining inclines inwardly and faces outward. It is arranged so as to face the gap between the radial lip (3a) and the side lip (3b) in contact with (2).
[0008]
Alternatively, as shown in FIGS. 3 and 4, the slinger (4) has a stepped shape (42) in which the tip portion spreads in several steps, and both the seal member (31) and the slinger (4) are provided. When the member is mounted at a regular position, the side lip (3b) is arranged to be in sliding contact with the front end in the axial direction.
[0009]
By assembling in such a positional relationship, the cooling water leaking from the mechanical seal in the pump chamber can be prevented from coming out of the slinger (4) located at the outermost side and the side lip (3b) of the seal member (31) in contact with the slinger (4). ) And refuses to leak inward.
Nevertheless, with respect to a small amount of moisture permeating from the fitting surface of the metal between the shaft (2) and the slinger (4), the radial lip (3a) disposed at the back thereof and facing outwardly and in contact with the shaft (2). ) Shows an effective secondary sealing action and prevents inward penetration.
Here, the other radial lip (3a) sliding in contact with the shaft (2) inward has a strong sealing effect on lubricating oil such as grease on the inner side.
[0010]
【Example】
In practicing the present invention, the seal member (31) is fitted and fixed to the outer ring (1), the slinger (4) is mounted on the shaft (2), and the side lip (3b) and the radial lip (3a) are The side lip (3b) is slidably contacted with the slinger (4). At this time, the leading end of the slinger (4) is formed and arranged in a bent shape so as to approach the side lip (3b) or in a tapered shape (41) cut and inclined as shown in FIG. The slender (4) has a bent or tapered shape (41) which has a guiding action to smoothly slide the side lip (3b) when the seal member (31) is assembled, thereby preventing the lip from being inverted. It has a useful function to eliminate improper mounting.
[0011]
In the formation of the chamfered shape, the outer peripheral side shoulder portion on the front side is formed by cutting into a tapered shape (41) toward the inner side to the light side. The present invention is not limited to this, and a cutting taper process may be performed on a portion formed in a pre-curved shape in advance.
[0012]
In addition, in the slinger (4) having a rising axial direction portion having a stepped shape (42) having a stepped end portion, when the sealing member (31) is attached, as shown in FIG. The tip enters the pocket of 3b), the side lip (3b) engages with the step, and the two are integrated. It is stored and transported in an integrated state that does not fall apart, and is further mounted on a water pump. At a proper mounting position, the engagement is released as shown in FIG. 4 to form an effective seal material.
[0013]
Further, when the axial space for mounting the bearing seal is limited, the shape in which the side lip (3b) is inclined to the inner side as described above has an advantage that a lip length having good sealing properties can be easily obtained. Have.
[0014]
【The invention's effect】
According to the present invention having the above-described structure, a double or triple seal structure is provided by the mating contact structure of a plurality of seal members to maintain high sealing safety, and the slinger (4) is connected to the shaft (2). It is easy to install because it is easy to attach by making the side lip (3b) in contact with the side lip (3b) due to the bent shape of the approximate crank shape. It is a seal for a water pump combined with a slinger (4) which can be formed and mounted at a low cost, for example, having good shapeability such as punching and drawing since it has a substantially crank shape because it has a substantially crank shape.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing another embodiment of the present invention.
FIG. 3 is an enlarged sectional view showing another embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view showing a state where the camera is mounted from the state of FIG.
FIG. 5 is an enlarged sectional view showing a conventional structure not using the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer ring 2 Shaft 3 Seal lip 3a Radial lip 3b Side lip 31 Seal member 32 Reinforcement ring 4 Slinger 41 Tapered 42 Step shape 5 Plural lips 5a of outer ring side seal ring 5a Main lip 5b Secondary lip 51 Outer ring side seal ring 6 Shaft side Seal ring 61 First cylindrical part 62 Second cylindrical part

Claims (4)

In a water pump bearing interposed between a water pump housing and an impeller, in a water pump bearing seal for sealing the bearing,
The water pump bearing seal includes a substantially crank-shaped slinger made of a metal ring and a seal member made of an elastic seal lip and a reinforcing ring for reinforcing the seal lip,
The seal member is provided with two radial lips as seal lips facing in and out of the inner ring of the bearing in and out of contact with each other , and a side lip is disposed so as to protrude obliquely inward and outward from the body,
A slinger having an axial portion that is fitted to a shaft that is axially outward from the seal member and whose outer peripheral surface is in sliding contact with the side lip and that enters the gap with the one radial lip is disposed. Features bearing seals for water pumps. 2. The bearing seal for a water pump according to claim 1, wherein the slinger has a tip of an outer diameter side shoulder inclined toward an inner diameter side. The bearing seal for a water pump according to claim 1, wherein the slinger has a tapered axial portion in which an outer diameter shoulder at a tip is inclined toward an inner diameter side. In a water pump bearing interposed between a water pump housing and an impeller, in a water pump bearing seal for sealing the bearing,
The water pump bearing seal includes a substantially clamp-shaped slinger formed of a metal ring and a seal member formed of an elastic seal lip and a reinforcing ring for reinforcing the seal lip,
The seal member is provided with two radial lips as seal lips facing in and out of the inner ring of the bearing in and out of contact with each other , and a side lip is disposed so as to protrude obliquely inward and outward from the body,
The seal member is fitted to a shaft that is axially outward from the seal member , and the tip has a stepped shape with a widened cross section, and the outer peripheral surface of the tip slides against the side lip and a gap with the one radial lip. A water pump bearing seal, wherein a slinger having an axial portion that penetrates into the housing is arranged.

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