JP2014169626A - Rotation supporting device for water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation supporting device for a water pump reduced in its weight.SOLUTION: A rotation supporting device for a water pump includes a rolling bearing unit, and a rotating shaft. The rotating shaft includes an impeller shaft part to which an impeller is fixed, a pulley shaft part to which a pulley is fixed, and a bearing inner ring shaft part which exists between the impeller shaft part and the pulley shaft part, and on the outer periphery of which the bearing unit is assembled. In one or both of the impeller shaft part and the pulley shaft part, hollow holes are formed which do not pass therethrough.

Description

  The water pump rotation support device according to the present invention is used in a state where it is incorporated in a water pump for circulating the cooling water of an automobile engine.

  As a water pump for circulating the cooling water of an automobile engine, one having a structure as shown in FIGS. The cylindrical housing 1 is formed on the outer peripheral surface of the inner end portion (the inner side is the side closer to the engine in the axial direction and indicates the right side of each drawing. The same applies throughout the present specification and claims). The mounting flange is used to fix the cylinder block of the engine. The rotary shaft 10 is provided on the inner diameter side of the housing 1, the first bearing 8 on the inner side and the outer side (the outer side is a side far from the engine in the axial direction, and indicates the left side of each drawing. And the second ball bearing 9 in combination) is rotatably supported by the rolling bearing unit 5. In addition, this rolling bearing unit 5 may be comprised by the double row ball array, for example, as described in Patent Document 1.

  Further, seal rings 7 and 7 are provided at both ends of the rolling bearing unit 5 in the axial direction (left and right direction in FIGS. 4 to 5). The seal rings 7 and 7, the outer ring 6 of the rolling bearing unit 5, and the rotating shaft 10 are provided. In order to prevent leakage of grease enclosed in the space surrounded by and the entry of foreign matter such as dust and water vapor existing outside.

  The rotating shaft 10 is made of a metal such as bearing steel, and each of them is a solid inner impeller shaft portion 11 and an outer pulley shaft portion 12, and a bearing inner ring shaft portion between the impeller shaft portion 11 and the pulley shaft portion 12. 13 is formed integrally. The bearing inner ring shaft portion 13 is set to be longer in the axial direction than at least between the seal rings 7 and 7, and the inner ring raceways of the first bearing 8 and the second bearing 9 constituting the rolling bearing unit 5 on the outer circumferential surface. 13 and 14 and the sliding surfaces of the seal rings 7 and 7 are formed.

  A mechanical seal 4 is provided between the outer peripheral surface of the impeller shaft portion 11 and the inner peripheral surface of the housing 1. The mechanical seal 4 prevents the hot water containing water vapor flowing in the water jacket from leaking outside while allowing the rotation of the rotating shaft 10 during operation of the engine. The impeller 3 is fixed to the inner tip portion of the impeller shaft portion 11. The impeller 3 enters inside a water jacket provided in the cylinder block. Then, as the rotary shaft 10 rotates, the cooling water in the water jacket is circulated with a radiator or the like (not shown).

  The pulley 2 is fixed to a portion of the pulley shaft portion 12 protruding from the outer end opening of the housing 1. In an assembled state to the engine, a belt (not shown) is stretched over the pulley 2 and the rotary shaft 10 is rotationally driven by the crankshaft of the engine.

The water pump described above is driven together with the cooling fan by fixing the cooling fan outside the pulley 2 of the rotary shaft 10 as described in Patent Document 2, for example. There is also a case.
By the way, with the recent reduction in weight of automobiles, it is desired to reduce the weight of water pumps incorporated in the automobile.

JP-A-9-222122 JP 2002-115548 A

  The water pump rotary support device of the present invention has been invented in order to reduce the weight in view of the above-described circumstances.

The above object of the present invention can be achieved by the following constitution.
A rotation support device for a water pump comprising a rolling bearing unit and a rotating shaft,
The rotating shaft includes an impeller shaft portion to which an impeller is fixed, a pulley shaft portion to which a pulley is fixed, and a bearing inner ring shaft portion between the impeller shaft portion and the pulley shaft portion, and the bearing unit is assembled to the outer periphery. ,
A water pump rotary support device, wherein a hollow hole that is not penetrated by machining is formed in one or both of the impeller shaft portion and the pulley shaft portion.

  According to the rotation support device for a water pump of the present invention configured as described above, since either one or both of the impeller shaft portion and the pulley shaft portion of the rotation shaft are hollow, the weight can be reduced.

Sectional drawing of the rotation support apparatus for water pumps which shows Example 1 of this invention. Sectional drawing of the rotation support apparatus for water pumps which shows Example 2 of this invention. Sectional drawing of the rotation support apparatus for water pumps which shows Example 3 of this invention. Sectional drawing which shows an example of the conventional structure of a water pump. Sectional drawing which takes out and shows only the rotation support apparatus part for water pumps of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The basic structure and operation of the rotary support device for a water pump according to the present invention are the same as those of the conventional structure shown in FIG. 5 described above. Is omitted or simplified, and the following description will focus on the features of the present invention.

FIG. 1 shows an example of the first embodiment of the present invention. The water pump rotation support device of this example includes a rolling bearing unit 5 and a rotation shaft 110.
The rolling bearing unit 5 includes seal rings 7 and 7 that seal an inner space surrounded by the outer ring 6, the inner first bearing 8, the outer second bearing 9, the rolling bearing unit 5, and the rotating shaft 110. It consists of.

  The rotating shaft 110 is formed by integrally forming an inner impeller shaft portion 111, an outer pulley shaft portion 112, and a bearing inner ring shaft portion 113 between the impeller shaft portion 111 and the pulley shaft portion 112. The bearing inner ring shaft portion 113 is set to be longer in the axial direction than at least between the seal rings 7, and the inner ring raceways of the first bearing 8 and the second bearing 9 constituting the rolling bearing unit 5 on the outer circumferential surface. The sliding contact surfaces 114 and 115 and the seal rings 7 and 7 are formed, and the rolling bearing unit 5 is assembled on the outer peripheral side.

  The impeller shaft portion 111 is formed with an impeller shaft portion hollow hole 116 opened to the inside in the axial direction by machining. The depth of the impeller shaft portion hollow hole 116 is preferably as deep as possible for weight reduction. However, considering the reduction in rigidity of the first bearing 8, the influence on the inner ring raceway 114, and the like, it is preferable that the length be equal to the length of the impeller shaft portion 111.

  Here, even if it is possible to form the impeller shaft portion hollow hole 116 deeper than the length of the impeller shaft portion 111 without worrying about the rigidity reduction of the first bearing 8 and the influence on the inner ring raceway 114, Since hot water containing water vapor flowing in the water jacket leaks to the outside, care must be taken not to penetrate the pulley shaft 112 side.

FIG. 2 shows an example of the second embodiment of the present invention. The water pump rotation support device of this example includes a rolling bearing unit 5 and a rotation shaft 210.
The rolling bearing unit 5 includes seal rings 7 and 7 that seal an inner space surrounded by the outer ring 6, the inner first bearing 8, the outer second bearing 9, the rolling bearing unit 5, and the rotating shaft 110. It consists of.

  The rotating shaft 210 is formed by integrally forming an inner impeller shaft portion 211 and an outer pulley shaft portion 212, and a bearing inner ring shaft portion 213 between the impeller shaft portion 211 and the pulley shaft portion 212. The bearing inner ring shaft portion 213 is set to be longer in the axial direction than at least between the seal rings 7 and 7, and the inner ring raceways of the first bearing 8 and the second bearing 9 constituting the rolling bearing unit 5 on the outer circumferential surface. The slidable contact surfaces of 214 and 215 and the seal rings 7 and 7 are formed.

  A pulley shaft hollow hole 217 opened to the outside in the axial direction is formed in the pulley shaft 212 by machining. The depth of the impeller shaft hollow hole 217 is preferably as deep as possible to reduce the weight. However, it is preferable that the length of the pulley shaft portion 212 is approximately equal to the length of the pulley shaft portion 212 in consideration of a decrease in rigidity of the second bearing 9 and an influence on the inner ring raceway 215.

  Here, even if it is possible to form the pulley shaft hollow hole 217 deeper than the length of the pulley shaft portion 212 without worrying about the rigidity reduction of the second bearing 9 and the influence on the inner ring raceway 215, Since hot water containing water vapor flowing through the water jacket leaks to the outside, care must be taken not to penetrate the impeller shaft portion 212 side.

FIG. 3 shows an example of the third embodiment of the present invention. The water pump rotation support device of this example includes a rolling bearing unit 5 and a rotation shaft 310.
The rolling bearing unit 5 includes seal rings 7 and 7 that seal an inner space surrounded by the outer ring 6, the inner first bearing 8, the outer second bearing 9, the rolling bearing unit 5, and the rotating shaft 110. It consists of.

The rotary shaft 310 is formed by integrally forming an inner impeller shaft portion 311, an outer pulley shaft portion 312, and a bearing inner ring shaft portion 313 between the impeller shaft portion 311 and the pulley shaft portion 312. The inner ring shaft portion 313 of the bearing is set longer in the axial direction than at least between the seal rings 7 and 7, and the inner ring raceways of the first bearing 8 and the second bearing 9 constituting the rolling bearing unit 5 on the outer peripheral surface. Slidable contact surfaces of 314 and 315 and seal rings 7 and 7 are formed.

The impeller shaft portion 311 is formed with an impeller shaft portion hollow hole 316 opened to the inside in the axial direction by machining. The depth of the impeller shaft portion hollow hole 316 is preferably as deep as possible for weight reduction. However, it is preferable that the length of the impeller shaft portion 311 is approximately equal to the length of the impeller shaft portion 311 in consideration of a decrease in rigidity of the first bearing 8 and an influence on the inner ring raceway 314.
A pulley shaft portion hollow hole 317 that is opened outward in the axial direction is formed in the pulley shaft portion 312 by machining. The depth of the impeller shaft portion hollow hole 317 is preferably as deep as possible for weight reduction. However, it is preferable that the length of the pulley shaft portion 312 be approximately equal to the length of the pulley shaft 312 in consideration of the rigidity reduction of the second bearing 9 and the influence on the inner ring raceway 315.

  Here, the impeller shaft portion hollow hole 316 and the pulley shaft portion hollow hole 317 can be formed deeply without causing a decrease in rigidity of the first bearing 8 and the second bearing 9 and concern about influence on the inner ring raceways 314 and 315. Even if possible, care must be taken so that the impeller shaft hollow hole 316 and the pulley shaft hollow hole 317 do not penetrate because hot water containing water vapor flowing in the water jacket leaks to the outside.

In the example of the embodiment of the present invention shown in FIGS. 1, 2 and 3, the first bearing 8 is a ball bearing and the second bearing 9 is a roller bearing. The positions of the bearings may be interchanged, a combination of ball bearings, or a combination of roller bearings.
Further, the rolling bearing unit 5 itself may be an angular double row bearing.

  Furthermore, although the outer ring of the first bearing 8 and the second bearing 9 is constituted by one outer ring 6, each of the first bearing 8 and the second bearing 9 includes, for example, a general-purpose bearing. Alternatively, one may have an outer ring, and each or one outer ring may be press-fitted into the inner diameter side of the cylindrical bearing housing.

  Similarly, each of the first bearing 8 and the second bearing 9 or one of them may have an inner ring. In this case, instead of forming the inner ring raceways 13 and 14 of the first bearing 8 and the second bearing 9 on the large-diameter shaft portions 112, 212 and 222 of the rotary shafts 110, 210 and 320, the bearing inner rings are used. A fitting portion for fitting is formed.

  Further, each of the first bearing 8 and the second bearing 9 or one of them may have a hermetic seal. In this case, the seal ring 7 on the side having the hermetic seal can be removed from the configuration.

Further, although the diameters of the impeller shaft portions 111, 211, 311, the pulley shaft portions 112, 212, 312 and the bearing inner ring shaft portions 113, 213, 313 are different from each other, the magnitude relationship between them may be different from the figure. Any or all of the diameters may be the same.

  As described above, the configuration of the rolling bearing unit 5 and the outer peripheral surface of the rotary shafts 110, 210, and 320 do not affect the function of the present invention. It may be adopted.

  As described above, according to the rotation support device for a water pump of the present invention, since one or both of the impeller shaft portion and the pulley shaft portion of the rotation shaft are hollow, the weight can be reduced. It can be suitably used as a rotation support device for a water pump that is used in a state of being incorporated in a water pump for circulating engine cooling water.

DESCRIPTION OF SYMBOLS 1 Housing 2 Pulley 3 Impeller 4 Mechanical seal 5, 105, 205, 305 Rolling bearing unit 6 Outer ring 7 Seal ring 8 First bearing 9 Second bearing 10, 110, 210, 310 Rotating shaft 11, 111, 211, 311 Impeller shaft portion 12, 112, 212, 312 Pulley shaft portion 13, 113, 213, 313 Bearing inner ring shaft portion 14, 114, 214, 314 Inner ring raceway 15, 115, 215, 315 Inner ring raceway 116, 316 Impeller shaft portion hollow hole 217, 317 Pulley shaft hollow hole

Claims (1)

A rotation support device for a water pump comprising a rolling bearing unit and a rotating shaft,
The rotating shaft includes an impeller shaft portion to which an impeller is fixed, a pulley shaft portion to which a pulley is fixed, and a bearing inner ring shaft portion between the impeller shaft portion and the pulley shaft portion, and the bearing unit is assembled to the outer periphery. ,
A rotation support device for a water pump, wherein a hollow hole that does not penetrate is formed in one or both of the impeller shaft portion and the pulley shaft portion.

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