JP2018184998A - Bearing device for water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a water pump capable of appropriately preventing the seal lip from being inverted when the slinger is inserted between the shaft and the seal lip. SOLUTION: The outer ring 21, the rolling element, the seal member 23, and the slinger 24 are provided, and the seal member has a base, an outer lip 23C extending from an end portion 23H on the inner peripheral side of the base, and a base portion. It has an inner lip 23D extending from the inner peripheral side end, and the outer lip and the inner lip are formed so as to be integrated so that they can swing with the inner peripheral side end of the base as a fulcrum. Connected to the inner peripheral end of the base, the outer peripheral surface of the slinger cylindrical portion 24A in the slinger is in contact with the inner diameter side of the outer lip and the inner diameter side of the inner lip, and the slinger is pulled out from the shaft 13. Then, the inner diameter D2 of the tip of the outer lip 23C is larger than the outer diameter D3 of the slinger cylindrical portion 24A, and the inner diameter D1 of the tip of the inner lip 23D is smaller than the outer diameter D3 of the slinger cylindrical portion 24A. [Selection diagram] FIG. 5

Description

  The present invention relates to a bearing device for a water pump.

  For example, a vehicle having an internal combustion engine is equipped with a water pump that circulates coolant for cooling the internal combustion engine. The water pump is connected to an inflow pipe and a discharge pipe. By rotating a blade called an impeller connected to a shaft that is driven to rotate, the coolant is sucked from the inflow pipe and the coolant is pumped from the discharge pipe. Yes. The shaft of the water pump is supported by the water pump housing via a bearing device in order to reduce friction and the like and rotate efficiently. That is, the impeller of the water pump is connected to one side of the shaft, the other side of the shaft is supported by the water pump housing via the bearing device, and the impeller and the bearing device are adjacent to each other.

  Here, when the coolant sucked and pumped by the impeller (water pump) leaks to the bearing device side, rust or the like may occur in the bearing device, which is not preferable. Therefore, a mechanical seal is provided in the vicinity of the impeller to close the gap between the water pump housing and the shaft in the vicinity of the impeller to prevent coolant leakage. However, even if a mechanical seal is used, a small amount of coolant may leak to the bearing device side. Therefore, a seal member is provided on the side of the bearing device facing the impeller to prevent coolant from entering the bearing device.

  For example, in Patent Document 1, as shown in FIG. 11, a rotating shaft 113 with an impeller fixed to one end, an outer ring 121, a rolling element 122, a cage 122A, a seal ring 123, a slinger 124, And a plurality of blades 128 </ b> B are provided integrally with or separate from the slinger 124 (second slinger 128). The seal ring 123 closes the opening between the outer ring 121 and the rotary shaft 113 on the impeller side, and has a plurality of seal lips 123C, 123D, and 123F. The slinger 124 is fitted and fixed to the rotary shaft 113 so as to be adjacent to the impeller side with respect to the seal ring 123, and is in sliding contact with the tip of at least one seal lip over the entire circumference. The blades 128B blow away nearby water and foreign matters radially outward.

JP 2006-80125 A

  Patent Document 1 does not specify a specific procedure for assembling the seal ring and slinger to the rotating shaft. However, in the following (Procedure 1) to (Procedure 3) shown in FIGS. When the seal ring 123 and the slinger 124 are assembled to the rotary shaft 113, the seal lip 123C of the seal ring 123 may be inverted as shown in FIG.

(Procedure 1) As shown in FIG. 8, after the seal ring 123 is fitted to the outer ring 121, the outer fitting of the slinger 124 is started from the impeller side of the rotating shaft 113 toward the seal ring 123. The state shown in FIG. 8 shows a state where the slinger 124 has not yet reached the seal ring 123.
(Procedure 2) As shown in FIG. 9, the slinger 124 is moved along the axial direction of the rotary shaft 113 in a direction approaching the seal ring 123. The state shown in FIG. 9 shows a state where the inner cylindrical portion 124A of the slinger 124 has reached the seal lip 123C. As shown in FIG. 11, the inner diameter D102 of the tip of the seal lip 123C in FIG. 9 is the inner cylinder of the slinger 124 so that the tip of the seal lip 123C is in sliding contact with the inner cylindrical portion 124A of the slinger 124. It is set smaller than the outer diameter D103 of the portion 124A. That is, when the slinger 124 is further moved toward the seal ring 123 from the state shown in FIG. 9, the seal lip 123C is in contact with the outer peripheral surface of the inner cylindrical portion 124A, and the solid line arrow in FIG. As shown in FIG.
(Procedure 3) As shown in FIG. 10, when the tip of the inner cylindrical portion 124A of the slinger 124 reaches approximately the center between the seal lip 123D and the seal lip 123C, the movement of the slinger 124 is stopped and positioned, and the rotating shaft The external fitting of the second slinger 128 to 113 is started. The positioned inner cylindrical portion 124A of the slinger 124 is in sliding contact with the seal lip 123C, but is not in sliding contact with the seal lip 123D.

  As shown in (Procedure 2) in the above procedure, the inner diameter D102 of the tip portion of the seal lip 123C shown in FIG. 9 is set smaller than the outer diameter D103 of the inner cylindrical portion 124A of the slinger 124. Accordingly, when the slinger 124 is moved toward the seal ring 123 from the state shown in FIG. 9, the seal lip 123C is pushed in the moving direction of the slinger 124 without being pushed radially outward as shown in FIG. And bend (the seal lip is reversed). The state shown in FIG. 12 is not preferable because the sealing performance of the seal lip 123C is lowered. Since the slinger 124 is provided, the operator cannot visually check whether the seal lip 123C is inverted.

  The present invention was devised in view of such a point, and when the slinger is inserted between the shaft and the seal lip, it is possible to appropriately prevent the seal lip from being reversed. It is an object to provide a bearing device.

  In order to solve the above problems, a first aspect of the present invention is a bearing device for a water pump provided on a shaft protruding from a water pump portion, and is arranged coaxially with the shaft and has an outer diameter of the shaft. A cylindrical outer ring having a larger inner diameter and an outer peripheral surface fixed to the housing, and a plurality of cylinders disposed in a cylindrical space formed between the inner peripheral surface of the outer ring and the outer peripheral surface of the shaft. A rolling member, and a seal member provided so as to close a space between an inner peripheral surface of the outer ring and an outer peripheral surface of the shaft in a pump side opening which is an end portion on the water pump portion side in the cylindrical space. And a slinger fitted to the shaft. The seal member is fitted into a seal holding portion provided on the inner peripheral surface of the outer ring at the pump side opening, and extends radially inward from the seal holding portion and has a diameter from the outer peripheral surface of the shaft. A base portion formed to a position separated by a predetermined distance outward in the direction, and a base inner peripheral side end portion which is an end portion on the shaft side in the base portion, and is extended toward the water pump portion side. An outer lip extending so as to gradually approach the outer peripheral surface of the shaft; and extending from the inner peripheral side end of the base toward the opposite side of the water pump portion and of the shaft An inner lip extended so as to gradually approach the outer peripheral surface, and the outer lip and the inner lip are formed integrally, and the integrated outer lip and inner lip -Up is connected to the base in the inner edge portion to swing as a fulcrum the base inner end. The slinger has a slinger cylindrical portion fitted into the shaft in a direction from the outer lip toward the inner lip along a shaft axis that is an axis of the shaft, and an outer peripheral surface of the slinger cylindrical portion is The inner diameter of the outer lip is in contact with the inner diameter side of the outer lip and the inner diameter side of the inner lip. When the slinger is removed from the shaft, the inner diameter of the tip of the outer lip is The bearing device for a water pump is larger than an outer diameter, and an inner diameter of a tip portion of the inner lip is smaller than an outer diameter of the slinger cylindrical portion.

  Next, a second invention of the present invention is the bearing device for a water pump according to the first invention, wherein the thickness in the direction of the shaft axis is reduced at the base inner peripheral end. A water pump bearing device in which a constricted portion is formed, and the outer lip and the inner lip integrated with each other are connected to the tip of the constricted portion.

  Next, a third invention of the present invention is the water pump bearing device according to the second invention, wherein the base portion is an elastic member extending from the constriction portion to the seal holding portion. A water pump bearing comprising: a base portion; and a metal mandrel base portion extending toward the seal holding portion from a position closer to the seal holding portion than the constricted portion in the elastic base portion. Device.

  According to the first invention, the outer lip is extended from the base inner peripheral end toward the water pump so as to gradually approach the outer peripheral surface of the shaft, and the inner lip is the base inner peripheral end. It is extended so that it may approach the outer peripheral surface of a shaft gradually toward the opposite side of a water pump. Then, the outer lip and the inner lip are integrated, and swing around the base inner peripheral side base end. Further, when the slinger cylindrical part is extracted from the shaft, the inner diameter of the outer lip tip is larger than the outer diameter of the slinger cylindrical part, and the inner diameter of the inner lip tip is smaller than the outer diameter of the slinger cylindrical part. Therefore, when the slinger cylindrical part is fitted to the shaft and moved in the direction from the outer lip toward the inner lip, when the slinger cylindrical part first reaches the position of the outer lip, it does not contact the outer lip. Pass through (the inner diameter of the tip of the outer lip> from the outer diameter of the slinger cylinder). Subsequently, when the slinger cylindrical portion reaches the position of the inner lip, the slinger cylindrical portion contacts the inner lip and pushes the inner lip outward in the radial direction (from the inner diameter of the tip of the inner lip <the outer diameter of the slinger cylindrical portion). ). Further, since the inner lip is inclined so as to gradually approach the outer peripheral surface of the shaft in the direction from the outer lip to the inner lip, the inner lip is pushed up radially outward without being inverted by the slinger cylindrical portion. The fact that the inner lip is pushed outward in the radial direction means that the inner lip swings radially outward with the base end on the inner peripheral side of the base as a fulcrum, and the outer lip integrated with the inner lip is automatically Rocks inward in the radial direction, and crimps to the outer peripheral surface of the slinger cylinder. Thus, when the slinger is inserted between the shaft and the seal lip, it is possible to provide a water pump bearing device that can appropriately prevent the seal lip from being inverted.

  According to the second invention, the integrated outer lip and inner lip are connected to the thinned constriction, and swing around the constriction as a fulcrum. Therefore, when the inner lip is pushed radially outward by the slinger cylindrical portion, the deformation of the inner lip is suppressed, and the inner lip swings radially outward when the inner lip swings radially outward. Can be generated.

  According to the third invention, the metal core base does not reach the constricted portion. Therefore, the swinging of the inner lip and the outer lip with the constricted portion as a fulcrum is not hindered by the mandrel base.

It is sectional drawing explaining the example of the whole structure of a water pump. It is an enlarged view of the power transmission part in FIG. FIG. 3 is an enlarged view around a seal member in FIG. 2. It is a figure explaining the example of the external appearance of a sealing member. It is a figure explaining the state which started the insertion of a slinger, when inserting a slinger between a shaft, an outer lip, and an inner lip. It is a figure explaining the state which moved the slinger from the state of FIG. 5 to the direction which goes to an inner lip from an outer lip, and the front-end | tip of the slinger cylindrical part did not contact an outer lip. From the state shown in FIG. 6, the slinger is further moved in the direction from the outer lip toward the inner lip, the tip of the slinger cylindrical portion comes into contact with the inner lip and pushes the inner lip outward in the radial direction. It is a figure explaining a mode that an outer lip rock | fluctuates radially inner side with a motion. It is an enlarged view (sectional view) around the seal member of a conventional water pump bearing device, and is a diagram illustrating a state in which the insertion of the slinger is started when the slinger is fitted between the shaft and the outer lip. It is. It is a figure explaining the state which moved the slinger from the state of FIG. 8 to the direction which goes to an inner lip from an outer lip, and the front-end | tip of the slinger cylindrical part contacted the outer lip. From the state of FIG. 9, the slinger is further moved in the direction from the outer lip toward the inner lip, and the tip of the slinger cylindrical portion reaches approximately the center between the inner lip and the outer lip, and the second slinger starts to be fitted. It is a figure explaining the example of a state. It is an enlarged view (cross-sectional view) around the seal member of the conventional water pump bearing device, and is a view for explaining a state in which the seal member and the slinger are correctly assembled without the seal lip (outer lip) being reversed. . It is an enlarged view (cross-sectional view) around the seal member of a conventional water pump bearing device, the seal lip (outer lip) is pushed into the slinger and reversed, and the seal member and the slinger are not assembled correctly FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, when the X axis, the Y axis, and the Z axis are described in the drawings, the X axis, the Y axis, and the Z axis are orthogonal to each other. Further, the X-axis direction is parallel to the shaft axis 13J, which is the axis of the shaft 13, and shows the direction from the power transmission unit 3 of the water pump 1 toward the water pump unit 2 in FIG. In the following description, “water pump bearing device” is referred to as “bearing device”.

[The overall structure of the water pump 1 (FIG. 1), the structure of the bearing device 20 in the power transmission unit 3 (FIG. 2), and the structure of the seal member 23 (FIGS. 3 and 4)]
The overall structure of the water pump 1 will be described with reference to FIG. The water pump 1 has a water pump part 2 and a power transmission part 3. 2 is an enlarged view of the power transmission unit 3 shown in FIG. 1, FIG. 3 is an enlarged view around the seal member 23 shown in FIG. 2, and FIG. 4 shows a part of the annular seal member 23. A cross section is shown.

  First, the structure of the water pump unit 2 will be described. The water pump unit 2 includes pump housings 11 and 12, a shaft 13, an impeller 14, a mechanical seal 15 and the like. The pump housing 11 houses a shaft 13, an impeller 14, and a mechanical seal 15. The pump housing 12 has an inflow pipe 12A and a discharge pipe 12B. The pump housings 11 and 12 correspond to “housings”.

  The shaft 13 has a cylindrical shape, is rotatably supported by the pump housing 11 via the bearing device 20, and is rotatable about the shaft axis 13J. An impeller 14 is attached to the shaft 13 on the side of the water pump part 2, and a bearing device 20 and a pulley support 17 are attached to the side of the shaft 13 opposite to the water pump part 2.

  When the impeller 14 rotates with the shaft 13, the impeller 14 is a blade that sucks the coolant from the inflow pipe 12A and pumps the sucked coolant from the discharge pipe 12B.

  The mechanical seal 15 is a seal member that seals a gap between the shaft 13 and the pump housing 11 in the vicinity of the impeller 14. The mechanical seal 15 prevents the coolant from leaking to the bearing device 20 from the gap between the shaft 13 in the vicinity of the impeller 14 and the pump housing 11. Note that the structure of the mechanical seal 15 is not limited to the structure shown in FIG. 1, and various structures can be employed, and detailed description of the structure of the mechanical seal 15 is omitted.

  Next, the structure of the power transmission unit 3 will be described. The power transmission unit 3 includes a pump housing 11, a shaft 13, a pulley support 17, a pulley 18, a bearing device 20, and the like. The pump housing 11 accommodates the bearing device 20.

  The pulley support 17 is fixed to the end of the shaft 13 opposite to the water pump 2. A pulley 18 is fixed to the pulley support 17. A belt (not shown) is applied to the pulley 18, and rotational power is transmitted to the pulley 18 via the belt, and rotational power is transmitted from the pulley 18 to the shaft 13 via the pulley support 17. In the present embodiment, an example having the pulley 18 will be described. However, instead of the pulley 18, a structure in which rotational power is transmitted to the shaft 13 using a gear or an electric motor may be used.

  The bearing device 20 is provided on the shaft 13 that protrudes toward the pulley 18 from the water pump unit 2, and is provided between the pulley support 17 and the impeller 14 in the shaft 13. As shown in FIG. 2, the bearing device 20 includes an outer ring 21, a rolling element 22, a cage 22A, a seal member 23, a slinger 24, a pulley-side seal member 25, and the like.

  The outer ring 21 has a cylindrical shape, is disposed coaxially with the shaft 13, has an inner diameter larger than the outer diameter of the shaft 13, and an outer peripheral surface is fixed to the pump housing 11. As shown in FIG. 2, a plurality of rolling elements 22 are arranged in a cylindrical space 26 formed between the inner peripheral surface of the outer ring 21 and the outer peripheral surface of the shaft 13. In the example shown in FIGS. 1 and 2, two annular inner raceway surfaces 13 </ b> A (concave portions) arranged in parallel are formed on the outer peripheral surface of the shaft 13 so as to be continuous in the circumferential direction. Further, two annular outer raceway surfaces 21A (concave portions) arranged in parallel so as to face each inner raceway surface 13A are formed on the inner circumference surface of the outer ring 21 so as to be continuous in the circumferential direction. Has been. In the cylindrical space 26, a plurality of rolling elements 22 are arranged between the inner raceway surface 13A and the outer raceway surface 21A. The plurality of rolling elements 22 are held at predetermined intervals in the circumferential direction by a holder 22A.

  As shown in FIG. 2, the pulley-side seal member 25 has an inner peripheral surface of the outer ring 21 and an outer peripheral surface of the shaft 13 at a pulley-side opening that is an end of the cylindrical space 26 opposite to the water pump unit 2. It is provided so as to close the space. The pulley-side seal member 25 is fitted into a seal holding portion provided on the inner peripheral surface of the outer ring 21 at the pulley-side opening. A plurality of lips that are in sliding contact with the outer peripheral surface of the shaft 13 are provided at the radially inner end of the pulley-side seal member 25. The pulley-side seal member 25 prevents water and foreign matter from entering the cylindrical space 26 from the pulley 18 side (from the pulley-side opening).

  As shown in FIG. 2, the seal member 23 is formed at the pump-side opening 20 </ b> K (see FIG. 3) that is the end of the cylindrical space 26 on the side of the water pump portion 2. It is provided so as to close the space between the outer peripheral surface. As shown in FIG. 3, the seal member 23 is fitted into a seal holding portion 21 </ b> H provided on the inner peripheral surface of the outer ring 21 in the pump-side opening 20 </ b> K. As shown in FIG. 3, an outer lip 23 </ b> C and an inner lip 23 </ b> D that are in sliding contact with the outer peripheral surface of the slinger cylindrical portion 24 </ b> A of the slinger 24 are provided at the radially inner end of the seal member 23. Further, the seal member 23 is provided with an axial lip 23F that is in sliding contact with the flange portion 24B of the slinger 24 (see FIG. 3). The seal member 23 prevents water and foreign matter from entering the cylindrical space 26 from the water pump unit 2 side (from the pump side opening 20K).

  As shown in FIGS. 3 and 4, the seal member 23 includes a base portion 23A, an outer lip 23C, an inner lip 23D, and an axial lip 23F. As shown in FIG. 3, the base portion 23 </ b> A extends radially inward from the seal holding portion 21 </ b> H of the outer ring 21, and is formed to a position separated from the outer peripheral surface of the shaft 13 by a predetermined distance L <b> 1 radially outward. Yes.

  As shown in FIG. 3, the outer lip 23 </ b> C extends from the base inner peripheral end 23 </ b> H, which is the end of the base 23 </ b> A on the shaft 13 side, toward the water pump unit 2 (see FIG. 1). And is extended so as to gradually approach the outer peripheral surface of the shaft 13. As shown in FIG. 3, the inner lip 23 </ b> D extends from the base inner peripheral end 23 </ b> H toward the side opposite to the water pump unit 2 (see FIG. 1) and is formed on the outer peripheral surface of the shaft 13. It is extended to approach gradually. Further, as shown in FIGS. 3 and 4, the outer lip 23C and the inner lip 23D are formed so as to be integrated (as shown in FIGS. 3 and 4, the cross section has a letter-like shape). To be integrated). The integrated portion 23E formed by the integrated outer lip 23C and inner lip 23D is connected to the base inner peripheral end 23H so that it can swing like a so-called seesaw with the base inner peripheral end 23H as a fulcrum. Has been.

  As shown in FIG. 3, a constricted portion 23G having a reduced thickness in the direction of the shaft axis 13J is formed at the base inner peripheral end 23H (see FIG. 4). An integrated outer lip 23C and inner lip 23D (integral portion 23E) are connected to the tip of the constricted portion 23G. That is, there is a constricted portion 23G at the inner peripheral side distal end of the base inner peripheral end 23H (where the outer lip 23C and the inner lip 23D are connected at the base inner peripheral end 23H). Accordingly, the integrated portion 23E in which the outer lip 23C and the inner lip 23D are integrated can swing like a so-called seesaw with the constricted portion 23G as a fulcrum. In addition, since the constricted portion 23G is formed thin, the constriction can be swung while the deformation of the outer lip 23C and the inner lip 23D is suppressed and the “H” shape is maintained. The axial lip 23F is extended from the middle of the base 23A (from a position radially outward from the base inner peripheral end 23H by a predetermined distance) toward the water pump 2 (see FIG. 1). And is extended so as to gradually move away from the outer peripheral surface of the shaft 13.

  As shown in FIG. 3, the base portion 23A of the seal member 23 has an elastic base portion 23B and a mandrel base portion 23M. The elastic base portion 23B extends from the constricted portion 23G to the seal holding portion 21H, and is formed of an elastic member. The mandrel base portion 23M extends from the position closer to the seal holding portion 21H than the constricted portion 23G in the elastic base portion 23B toward the seal holding portion 21H, and is made of metal. The elastic base portion 23B, the base inner peripheral side end portion 23H, the constricted portion 23G, the outer lip 23C, the inner lip 23D, and the axial lip 23F are integrally formed of an elastic member.

  As shown in FIG. 3, the slinger 24 has a cylindrical slinger cylindrical portion 24A that is externally fitted to the shaft 13, a flange portion 24B, and a large-diameter cylindrical portion 24C. The slinger cylindrical portion 24A has a cylindrical shape and is fitted into the shaft 13 in a direction from the outer lip 23C toward the inner lip 23D along the shaft axis 13J. The outer peripheral surface of the slinger cylindrical part 24A is in contact (sliding contact) with the periphery of the tip on the inner diameter side of the outer lip 23C and the periphery of the tip of the inner lip 23D on the inner diameter side. The flange portion 24B extends radially outward from the end of the slinger cylindrical portion 24A on the water pump portion 2 side. A cylindrical large-diameter cylindrical portion 24C is connected to the radially outer end of the flange portion 24B.

  With the configuration described above, even if a small amount of coolant or the like leaks from the mechanical seal 15 to the bearing device 20 side, first, the coolant into the bearing device 20 (in the cylindrical space 26) by the slinger 24. And the like are prevented from entering. Further, when the coolant or the like exceeds the slinger 24, the coolant or the like is prevented from entering in the order of the axial lip 23F, the outer lip 23C, and the inner lip 23D. Therefore, it is possible to appropriately prevent water and foreign matter from entering the cylindrical space 26.

  In the conventional structure described with reference to FIGS. 8 to 12, when the slinger is fitted between the lip of the seal member and the shaft, the lip is pushed into the slinger and bent (the lip is reversed). (See FIG. 12). In the state shown in FIG. 12 (the state where the seal lip 123C is inverted), the sealing performance is deteriorated. Therefore, in the present application, the seal member 23 and the slinger 24 have a structure described below, so that the outer lip 23C can be appropriately and reliably prevented from being reversed when the slinger 24 is fitted. .

● [Structure for preventing the outer lip 23C from inverting when the slinger 24 is fitted (FIGS. 5 to 7)]
FIG. 5 shows a direction from the outer lip 23C toward the inner lip 23D along the shaft axis 13J in a state where the seal member 23 is fitted in the seal holding portion 21H provided on the inner peripheral surface of the outer ring 21. The example of the state which started insertion of the slinger 24 is shown. The state shown in FIG. 5 shows a state where the tip of the slinger cylindrical portion 24A of the slinger 24 has not yet reached the outer lip 23C. From here, the slinger 24 is gradually moved (press-fitted) in the direction from the outer lip 23C to the inner lip 23D. As shown in FIG. 5, when the seal member 23 is fitted in the seal holding portion 21H and the outer lip 23C and the inner lip 23D are not in contact with the slinger cylindrical portion 24A, the tip of the outer lip 23C is used. The inner diameter D2 of the portion is larger than the outer diameter D3 of the slinger cylindrical portion 24A, and the inner diameter D1 of the tip portion of the inner lip 23D is smaller than the outer diameter D3 of the slinger cylindrical portion 24A. That is, the relationship of “the inner diameter D2 of the outer lip 23C> the outer diameter D3 of the slinger cylindrical portion 24A> the inner diameter D1 of the inner lip 23D” is set.

  FIG. 6 shows a state in which the slinger cylindrical portion 24A is further moved from the state of FIG. 5 along the shaft axis 13J in the direction from the outer lip 23C to the inner lip 23D. Since “the inner diameter D2 of the outer lip 23C> the outer diameter D3 of the slinger cylindrical portion 24A” is set, the slinger cylindrical portion 24A passes through without contacting the tip of the outer lip 23C. Accordingly, it is possible to reliably prevent the outer lip 23C from being pushed into the slinger cylindrical portion 24A and reversed.

  FIG. 7 shows a state where the slinger cylindrical portion 24A is further moved from the state of FIG. 6 along the shaft axis 13J in the direction from the outer lip 23C to the inner lip 23D. Since “the outer diameter D3 of the slinger cylindrical portion 24A> the inner diameter D1 of the inner lip 23D” is set, the tip of the slinger cylindrical portion 24A comes into contact with the tip of the inner lip 23D. When the slinger cylindrical portion 24A further moves, the inner lip 23D is pushed up radially outward (swings radially outward) by the slinger cylindrical portion 24A. When the inner lip 23D swings radially outward, the integrated outer lip 23C swings radially inward (like a seesaw).

  As shown in FIG. 3, the movement of the slinger 24 is stopped at a position where the tip of the slinger cylindrical portion 24A slightly passes the inner lip 23D. In the state shown in FIG. 3, the inner lip 23 </ b> D is crimped to the outer peripheral surface of the slinger cylindrical portion 24 </ b> A by a restoring force from a state where it is pushed up radially outward. Further, the outer lip 23C is pressure-bonded to the outer peripheral surface of the slinger cylindrical portion 24A by the force of rocking inward in the radial direction accompanying the rocking of the inner lip 23D in the radially outward direction. Moreover, after the tip of the slinger cylindrical portion 24A passes through the position of the outer lip 23C, the outer lip 23C swings and is pressed against the outer peripheral surface of the slinger cylindrical portion, so that the outer lip 23C is pushed into the slinger cylindrical portion 24A. It is possible to reliably prevent the inversion.

  Therefore, the state in which the slinger 24 is extracted from the shaft 13 from the state configured as shown in FIG. 3 is the state shown in FIG. That is, when the slinger 24 is removed from the shaft 13, as shown in FIG. 5, the inner diameter D2 of the tip of the outer lip 23C is larger than the outer diameter D3 of the slinger cylindrical portion 24A, and the inner diameter of the tip of the inner lip 23D. D1 is smaller than the outer diameter D3 of the slinger cylindrical portion 24A. The inner diameter D1, the inner diameter D2, and the outer diameter D3 are set such that the inner diameter D2> the outer diameter D3> the inner diameter D1, and specific dimensions are appropriately set.

  Various changes, additions, and deletions can be made to the structure, configuration, shape, appearance, and the like of the bearing device 20 (corresponding to a water pump bearing device) of the present invention without departing from the spirit of the present invention. For example, the axial lip 23F of the seal member 23 may or may not be present. The large-diameter cylindrical portion 24C of the slinger 24 may or may not be present. Further, the shape of the base 23A in the seal member 23 is not limited to the shape shown in each drawing.

DESCRIPTION OF SYMBOLS 1 Water pump 2 Water pump part 3 Power transmission part 11, 12 Pump housing 12A Inflow piping 12B Discharge piping 13 Shaft 13A Inner raceway surface 13J Shaft axis 14 Impeller 15 Mechanical seal 17 Pulley support body 18 Pulley 20 Bearing device (water pump bearing) apparatus)
21 outer ring 21A outer raceway surface 22 rolling element 22A retainer 23 seal member 23A base 23B elastic base 23C outer lip 23D inner lip 23E integral part 23F axial lip 23G constricted part 23H base inner peripheral end 23M corer base 24 slinger 24A Cylindrical part 24B Flange part 24C Large diameter cylindrical part 25 Pulley side seal member D1, D2 Inner diameter D3 Outer diameter

Claims (3)

A bearing device for a water pump provided on a shaft protruding from a water pump portion,
A cylindrical outer ring disposed coaxially with the shaft and having an inner diameter larger than the outer diameter of the shaft and having an outer peripheral surface fixed to the housing;
A plurality of rolling elements disposed in a cylindrical space formed between the inner peripheral surface of the outer ring and the outer peripheral surface of the shaft;
A seal member provided so as to close a space between an inner peripheral surface of the outer ring and an outer peripheral surface of the shaft in a pump side opening portion which is an end portion on the water pump portion side in the cylindrical space;
A slinger fitted into the shaft;
Have
The sealing member is
The pump side opening is fitted into a seal holding part provided on the inner peripheral surface of the outer ring,
A base portion extending radially inward from the seal holding portion and formed to a position separated from the outer peripheral surface of the shaft by a predetermined distance radially outward;
The base is extended from the inner peripheral side end of the base, which is the end on the shaft side, toward the water pump portion and extended so as to gradually approach the outer peripheral surface of the shaft. With an outer lip,
An inner lip extending from the base inner peripheral side end toward the side opposite to the water pump unit and extending gradually closer to the outer peripheral surface of the shaft;
Have
The outer lip and the inner lip are formed so as to be integrated, and the integrated outer lip and inner lip can swing with the inner peripheral end of the base as a fulcrum. It is connected to the inner peripheral side end,
The slinger has a slinger cylindrical portion fitted into the shaft in a direction from the outer lip toward the inner lip along a shaft axis that is an axis of the shaft, and an outer peripheral surface of the slinger cylindrical portion is It is in contact with the inner diameter side of the outer lip and the inner diameter side of the inner lip,
In the state where the slinger is removed from the shaft,
The inner diameter of the distal end portion of the outer lip is larger than the outer diameter of the slinger cylindrical portion,
The inner diameter of the tip portion of the inner lip is smaller than the outer diameter of the slinger cylindrical portion,
Bearing device for water pump. The water pump bearing device according to claim 1,
A constricted portion in which the thickness in the direction of the shaft axis is reduced is formed at the end on the inner peripheral side of the base,
The outer lip integrated with the inner lip is connected to the tip of the constricted portion,
Bearing device for water pump. The water pump bearing device according to claim 2,
The base is
An elastic base that is an elastic member extended from the constricted portion to the seal holding portion;
A metal core base extending from the position closer to the seal holding part than the constricted part in the elastic base part toward the seal holding part;
have,
Bearing device for water pump.

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