JP2015021567A - Double row bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double row bearing capable of suppressing axial movement of a rolling element and a cage, to suppress degradation of durability.SOLUTION: A double row bearing includes an outer ring 3 having a first outer raceway surface 3a and a second outer raceway surface 3b on an inner peripheral face, a shaft 2 having a first inner raceway surface 2a and a second inner raceway surface 2b on an outer peripheral face, a plurality of balls 41 disposed between the first outer raceway surface 3a and the first inner raceway surface 2a, a plurality of rollers 42 disposed between the second outer ring raceway surface 3b and the second inner ring raceway surface 2b, a holding member 5 having a ball cage 6 rollably holding the plurality of balls 41, and a roller cage 7 for rollably holding the plurality of rollers 42, and a second seal member 82 axially opposed to the roller cage 7. In the holding member 5, the axial movement to the second seal member 82, of the roller cage 7 is restricted by connecting the ball cage 6 and the roller cage 7.

Description

  The present invention relates to a double row bearing, and more particularly to a double row bearing used for a cooling water pump in an internal combustion engine of an automobile.

  Conventionally, as a water pump bearing used for a cooling water pump in an internal combustion engine of an automobile, a double row bearing having a double row rolling element row is used (for example, see Patent Document 1).

  The double row bearing described in Patent Document 1 has a pump shaft that constitutes an inner ring and an outer ring that is coaxially arranged around the pump shaft, and a plurality of bearing inner spaces between the pump shaft and the outer ring have a plurality of bearings. Ball rows made of spherical rolling elements and roller rows made of a plurality of cylindrical rolling elements are arranged in double rows in the axial direction. Further, a pair of sealing devices are provided in the bearing inner space between the axial ends of the outer ring and the pump shaft, and the outflow of water vapor generated when the cooling water becomes high temperature is suppressed.

  The ball train is disposed between circumferential grooves formed on the outer peripheral surface of the pump shaft and the inner peripheral surface of the outer ring, and the roller train is a track formed on each of the outer peripheral surface of the pump shaft and the inner peripheral surface of the outer ring. It is arranged between the faces. The ball row is held by an annular ball holder, and the roller row is held by an annular roller holder. An annular spacer is arranged between the ball row held by the ball holder and the roller holder to maintain a spacing between the ball row and the roller row.

  The roller holder is provided with a connecting claw, and the annular spacer is provided with a connecting recess connected to the connecting claw of the roller holder. And it is supposed that it will be easy to incorporate the annular spacer in the manufacturing process by engaging the connecting claw with the connecting recess to connect the roller holder and the annular spacer and assembling in this connected state.

JP 2000-55043 A

  By the way, in the double row bearing configured as in Patent Document 1, when the roller row moves to the sealing device side together with the roller cage and the annular spacer, the roller cage may interfere with the sealing device. This is because the cylindrical rolling element in the roller row is inclined in the bearing inner space between the pump shaft and the outer ring (skew) because the roller row is arranged with sufficient margin between the pump shaft and the outer ring. This is because a thrust force that moves the roller cage toward the sealing device acts on the roller train, and the roller cage is pushed out toward the sealing device.

  As a result, if the roller cage slides while being pressed against the sealing device, the sealing device may be worn or deformed, and the durability may be affected, such as an increase in the amount of water vapor leakage.

  Accordingly, an object of the present invention is to provide a double row bearing that can suppress the axial movement of the rolling elements and the cage, thereby suppressing the decrease in durability.

  In order to achieve the above object, the present invention provides an outer member having first and second outer ring raceway surfaces on an inner peripheral surface, and an inner member having first and second inner ring raceway surfaces on an outer peripheral surface. A plurality of spherical first rolling elements disposed between the first outer ring raceway surface and the first inner ring raceway surface, and disposed between the second outer ring raceway surface and the second inner ring raceway surface. The plurality of cylindrical second rolling elements, the first holding portion that holds the plurality of first rolling elements in a rollable manner, and the plurality of second rolling elements in a rollable manner. A holding member having a second holding part, and a seal member that axially opposes the second holding part and seals a space between the outer member and the inner member, The holding member is moved in the axial direction of the second holding portion toward the seal member by connecting the first holding portion and the second holding portion. Providing double row bearing is restricted.

  According to the present invention, it is possible to suppress the axial movement of the rolling elements and the cage, thereby suppressing a decrease in durability.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole water pump provided with the bearing for water pumps which concerns on the 1st Embodiment of this invention, and the bearing for water pumps. It is the elements on larger scale which expand and show the A section of FIG. It is a perspective view which shows the external appearance of the ball holder and roller holder which comprise a holding member. It is sectional drawing which shows the cross section of a ball holder and a roller holder. It is sectional drawing which shows the cross section of the ball holder and roller holder of the bearing for water pumps concerning the 2nd Embodiment of this invention. It is sectional drawing which shows the cross section of the ball holder and roller holder of the bearing for water pumps concerning the 3rd Embodiment of this invention. It is sectional drawing which shows the cross section of the holding member of the bearing for water pumps concerning the 4th Embodiment of this invention.

[First Embodiment]
A water pump bearing according to a first embodiment of the present invention will be described with reference to FIGS.

(Whole structure of water pump bearing)
FIG. 1 is a cross-sectional view showing the water pump bearing according to the first embodiment of the present invention and the entire water pump including the water pump bearing. FIG. 2 is an enlarged view of part A of FIG. 1 showing the main part of the bearing for the water pump.

  The water pump bearing 1 is interposed between a shaft 2 as an inner member, a cylindrical outer ring 3 as an outer member disposed on the outer periphery of the shaft 2, and the shaft 2 and the outer ring 3. A plurality of balls 41 as spherical first rolling elements, a plurality of rollers 42 as cylindrical second rolling elements, and a holding member 5 that holds the plurality of balls 41 and the plurality of rollers 42 in a rollable manner. And first and second seal members 81 and 82 that seal the space between the shaft 2 and the outer ring 3 on both sides of the holding member 5 in the axial direction.

  The holding member 5 includes a ball holder 6 as a first holding unit that holds a plurality of balls 41 in a rollable manner, and a roller holder as a second holding unit that holds a plurality of rollers 42 in a rollable manner. It consists of seven. The ball holder 6 and the roller holder 7 are separate bodies, and the holding member 5 is configured by connecting the ball holder 6 and the roller holder 7 along the axial direction. Details of the holding member 5 will be described later.

  The water pump bearing 1 is disposed between the belt pulley 10 and the impeller 11 by press fitting the outer ring 3 into the bearing assembly cylinder 90 of the pump housing 9. An auxiliary belt of an engine (internal combustion engine) is wound around the belt pulley 10, and the shaft 2 is rotationally driven via the belt pulley 10 by the rotation of the crank pulley connected to the crankshaft. The impeller 11 rotates integrally with the shaft 2 to circulate engine coolant.

(Configuration of shaft 2)
The shaft 2 has a first inner raceway surface 2 a for rolling a plurality of balls 41 and a second inner raceway surface 2 b for rolling a plurality of rollers 42 on the outer peripheral surface. The cylinder 90 is disposed so as to be rotatable around the rotation axis O. A belt pulley 10 is attached to one end portion of the shaft 2 via a pulley sheet 12 made of an elastic body, and an impeller 11 is attached to the other end portion. The impeller 11 includes a shaft-like base portion 110 and blade portions 111 provided radially around the base portion 110, and an annular seal member 13 is disposed between the base portion 110 and the pump housing 9.

(Configuration of outer ring 3)
The outer ring 3 has a first outer raceway surface 3a for rolling a plurality of balls 41 and a second outer raceway surface 3b for rolling a plurality of rollers 42 on the inner peripheral surface. Nine bearing assembly cylinders 9 are press-fitted. Of the both ends in the axial direction of the outer ring 3, a seal fitting groove 3c for fitting and fixing the first seal member 81 is formed at the end on the impeller 11 side. A seal fitting groove 3d for fitting and fixing the two seal members 82 is formed.

(Configuration of ball 41 and roller 42)
The balls 41 are spherical, and a plurality of balls 41 are arranged along the circumferential direction of the shaft 2 and the outer ring 3 to constitute a ball row 410. The plurality of balls 41 are arranged at equal intervals between the first inner raceway surface 2 a of the shaft 2 and the first outer raceway surface 3 a of the outer ring 3. The first inner raceway surface 2a has an arc shape that is recessed inward in a cross section obtained by cutting the shaft 2 along a plane including the rotation axis O. Further, the first outer raceway surface 3a has an arc shape that is recessed outwardly in a cross section obtained by cutting the outer ring 3 along a plane including the rotation axis O.

  The rollers 42 are cylindrical rollers, and a plurality of rollers 42 are arranged along the circumferential direction of the shaft 2 and the outer ring 3 to constitute a roller row 420. The plurality of rollers 42 are arranged at equal intervals between the second inner raceway surface 2 b of the shaft 2 and the second outer raceway surface 3 b of the outer ring 3. The second inner raceway surface 2 b and the second outer raceway surface 3 b are formed in a cylindrical shape parallel to the rotation axis O, and are opposed to each other in the radial direction of the rotation axis O via the roller row 420.

  The ball row 410 and the roller row 420 are arranged in parallel along the rotation axis O, and the ball row 410 is disposed on the impeller 11 side and the roller row 420 is disposed on the belt pulley 10 side.

(Configuration of the first seal member 81 and the second seal member 82)
The first and second seal members 81 and 82 are disposed between the outer peripheral surface of the shaft 2 and the inner peripheral surface of the outer ring 3 so as to face each other with the holding member 5 interposed therebetween.

  The first seal member 81 has a metal core 810 made of metal and a seal portion 811 made of an elastic body such as rubber, and the outer periphery of the metal core 810 is fitted in the seal fitting groove 3 c of the outer ring 3. . The seal portion 811 includes a base piece 812 joined to the cored bar 810 and first and second seal lips 813 and 814 that are in sliding contact with the outer peripheral surface of the shaft 2. The first and second seal lips 813 and 814 are formed integrally with the base piece 812 and divided into two forks from the inner diameter side end of the base piece 812. The base piece 812 is joined to the cored bar 810 by, for example, vulcanization adhesion. The first seal member 81 is opposed to the ball cage 6 in the axial direction.

  The second seal member 82 is configured similarly to the first seal member 81. That is, the second seal member 82 includes a metal core 820 made of metal and a seal portion 821 made of an elastic body such as rubber, and the outer periphery of the metal core 820 is fitted into the seal fitting groove 3 d of the outer ring 3. ing. The seal portion 821 includes a base piece 822 joined to the core metal 820, and first and second seal lips 823 and 824 that are in sliding contact with the outer peripheral surface of the shaft 2. The first and second seal lips 823 and 824 are formed integrally with the base piece 822 and divided into two forks from the inner diameter side end of the base piece 822. The base piece 822 is joined to the core metal 820 by, for example, vulcanization adhesion. The second seal member 82 faces the roller holder 7 in the axial direction.

(Configuration of holding member 5)
FIG. 3 is a perspective view showing the appearance of the ball holder 6 and the roller holder 7 constituting the holding member 5. FIG. 4 is a cross-sectional view showing cross sections of the ball holder 6 and the roller holder 7.

  The ball cage 6 is an annular member in which a plurality of holding holes 6a for holding a plurality of balls 41 so as to be capable of rolling are formed, and is made of, for example, a molded body of fiber reinforced resin such as nylon containing glass fiber. . The holding hole 6 a is formed in a circular arc shape so that the inner surface 6 b is along the outer surface of the ball 41. The inner diameter of the holding hole 6a is slightly larger than the outer diameter of the ball 41, and the ball 41 can roll while being accommodated in the holding hole 6a.

  Further, the ball cage 6 projects from the base 60 facing the first seal member 81 to the second seal member 82 side (roller cage 7 side) and partitions adjacent holding holes 6a. And a plurality of protrusions 61.

  In the present embodiment, seven holding holes 6 a are formed in the ball holder 6, and these holding holes 6 a are partitioned by seven protrusions 61. A plate-like connection piece 62 for connection to the roller holder 7 is formed on the tip side of the three protrusions 61 among the seven protrusions 61. In addition, a pair of projecting pieces 63 and 63 for preventing the ball 41 accommodated in the holding hole 6a from coming off are formed on the front end side of the remaining four projecting parts 61 excluding these three projecting parts 61. The pair of protrusions 63, 63 protrude in the circumferential direction toward the opposite directions from the tip of the protrusion 61 so as to follow the outer surface of the ball 41.

  The connecting piece 62 is provided at an extended portion 620 extending along a direction parallel to the rotation axis O, and at an end portion of the extended portion 620 on the roller holder 7 side, and is an engagement projecting inwardly. And a protrusion 621. The inner surface 621a of the engagement protrusion 621 is formed in a tapered shape that is separated from the outer peripheral surface of the shaft 2 toward the tip of the roller holder 7 side. The engagement protrusion 621 engages with an engagement recess 711 of the roller holder 7 described below.

  The roller holder 7 is an annular member in which a plurality (12 pieces) of holding holes 7a for holding the plurality of rollers 42 so as to be capable of rolling are formed. For example, a fiber reinforced resin such as nylon containing glass fibers is used. It consists of a molded body. The holding hole 7a has a rectangular shape in which the axial length parallel to the rotation axis O is longer than the circumferential width when viewed from the outer peripheral side of the roller holder 7, and the axial length of the holding hole 7a is The roller 42 is slightly longer than the axial length, and the circumferential width of the holding hole 7 a is slightly larger than the outer diameter of the roller 42.

  The roller holder 7 is formed on a first annular portion 71 formed on the ball holder 6 side of the holding hole 7a and a second seal member 82 of the holding hole 7a, and is axially connected to the second seal member 82. The second annular portion 72 having an end surface 72a facing the first annular portion, and the plurality of column portions 73 that connect the first annular portion 71 and the second annular portion 72 in the radial direction are integrally provided.

  In the first annular portion 71, an engaging recess 711 formed in the circumferential direction of the roller retainer 7 is formed on the outer peripheral surface 71a. In the present embodiment, the engaging recess 711 is formed in an annular shape over the entire circumference of the first annular portion 71. Further, the first annular portion 71 is formed with a tapered portion 712 having an inclined surface 712 a inclined toward the inner surface 621 a of the engaging protrusion 621 at the tip portion closer to the ball cage 6 than the engaging recess 711. Has been.

  The ball holder 6 and the roller holder 7 are connected to an engagement recess 711 formed on the roller holder 7 by engaging an engagement protrusion 621 formed on the ball holder 6. The holding member 5 is restricted from moving in the axial direction of the roller holder 7 toward the second seal member 82 by connecting the ball holder 6 and the roller holder 7 together. That is, the water pump bearing 1 has a movement restricting structure that restricts the movement of the roller retainer 7 toward the second seal member 82.

  This movement restricting structure is formed by the first inner raceway surface 2a of the shaft 2 and the first outer raceway surface 3a of the outer ring 3 in which movement in the direction along the rotation axis O of the plurality of balls 41 is formed in an arc groove shape. Focusing on the restriction, the roller holder 7 is connected to the ball holder 6 holding the plurality of balls 41 to restrict the axial movement of the roller holder 7. In other words, since the plurality of balls 41 are partially inserted into the first inner raceway surface 2a and the first outer raceway surface 3a, the movement of the plurality of balls 41 in the direction along the rotation axis O is restricted. The ball holder 6 that holds the plurality of balls 41 is also restricted from moving in the direction along the rotation axis O by the plurality of balls 41. The axial movement of the roller holder 7 is restricted by engaging the engaging protrusion 621 of the ball holder 6 and the engaging recess 711 of the roller holder 7.

(Assembly method of bearing 1 for water pump)
Next, an example of a method for assembling the water pump bearing 1 into the bearing assembly cylinder 90 will be described.

  In the assembly of the water pump bearing 1, the assembly process of the ball 41 and the ball cage 6, the assembly process of the roller 42 and the roller cage 7, and the assembly process of the first and second seal members 81 and 82 are performed. These steps are sequentially performed.

(Assembly process of ball 41 and ball cage 6)
To assemble the plurality of balls 41 and the ball cage 6 between the shaft 2 and the outer ring 3, first, the outer ring 3 is eccentric with respect to the shaft 2, and the space between the outer peripheral surface of the shaft 2 and the inner peripheral surface of the outer ring 3 is increased. A gap having a width larger than the diameter of the ball 41 is formed, and a plurality of balls 41 are inserted between the first inner raceway surface 2a and the first outer raceway surface 3a through the gap. Thereafter, the ball cage 6 is inserted from one end of the outer ring 3 in a state where the shaft 2 and the outer ring 3 are coaxially aligned and a plurality of balls 41 are arranged at equal intervals. At this time, the pair of projecting pieces 63, 63 of the ball holder 6 are in contact with the ball 41 and spread, and the ball 41 is accommodated in each of the plurality of holding holes 6a.

(Assembly process of roller 42 and roller holder 7)
In order to assemble the plurality of rollers 42 and the roller holder 7 between the shaft 2 and the outer ring 3, the rollers 42 are accommodated in the plurality of holding holes 7 a of the roller holder 7 in advance, and the roller holder 7 is in that state. Is inserted from the other end of the outer ring 3 together with the plurality of rollers 42. At this time, the inclined surface 712a of the tapered portion 412 in the first annular portion 71 of the roller holder 7 contacts the inner surface 621a of the engagement protrusion 621 of the ball holder 6, and the plurality of extending portions 620 of the connecting piece 62 are provided. It is pushed outward. When the roller retainer 7 further moves toward the ball retainer 6, a part of the engagement protrusion 621 of the ball retainer 6 fits into the engagement recess 711 of the roller retainer 7 and engages with the engagement protrusion 621. The mating recess 711 is engaged. Thereby, the ball holder 6 and the roller holder 7 are connected.

(Assembly process of first and second seal members 81 and 82)
The first and second seal members 81 and 82 are formed by connecting the ball 41 and the ball holder 6, and the roller 42 and the roller holder 7 between the shaft 2 and the outer ring 3, and from the end of the outer ring 3 to the outer ring. 3 and the shaft 2 are inserted and assembled.

  The first seal member 81 is assembled so that the outer peripheral portion of the cored bar 810 is fitted in the seal fitting groove 3 c of the outer ring 3 and is opposed to the ball cage 6 in the axial direction. The second seal member 82 is assembled so that the outer peripheral portion of the cored bar 820 is fitted into the seal fitting groove 3 d of the outer ring 3 and is opposed to the roller holder 7 in the axial direction.

  The assembly of the water pump bearing 1 is performed by the above process. In the water pump bearing 1 assembled in this way, the outer ring 3 is press-fitted into the bearing assembly cylinder 90 of the pump housing 9, the impeller 11 is attached to one end of the shaft 2, and the other end of the shaft 2 is attached. A belt pulley 10 is attached to constitute the water pump 100.

(Operation of water pump 100)
Normal operation in the water pump 100 is performed in the same manner as in the prior art. That is, the driving force of the vehicle engine is transmitted to the belt pulley 10 via the auxiliary belt, and the shaft 2 is rotationally driven with respect to the outer ring 3. Thereby, the impeller 11 attached to the one end part of the shaft 2 rotates with the shaft 2, and the blade | wing part 111 of the impeller 11 circulates the cooling water of an engine.

  When the shaft 2 is driven to rotate, when the roller 42 tilts in the holding hole 7a of the roller holder 7 and rolls in a skewed state, the roller 42 comes into contact with the second annular portion 72 of the roller holder 7 and the roller The cage 7 may be pressed toward the second seal member 82 side.

  However, in the present embodiment, the roller holder 7 is connected to the ball holder 6 and the axial movement of the roller holder 7 toward the second seal member 82 is restricted. The contact with the second seal member 82 is prevented. Thereby, abrasion and deformation | transformation of the 2nd seal member 82 are suppressed, and the fall of durability of the bearing 1 for water pumps can be suppressed.

[Effect of the first embodiment]
According to the first embodiment described above, the following effects can be obtained.

(1) Since the engagement protrusion 621 of the ball holder 6 engages with the engagement recess 711 of the roller holder 7 and the ball holder 6 and the roller holder 7 are connected, the second of the roller holder 7 Movement toward the seal member 82 side is restricted, the contact between the roller holder 7 and the second seal member 82 can be prevented, and wear and deformation of the second seal member 82 are suppressed. Thereby, durability of the bearing 1 for water pumps can be improved.

(2) Since the ball cage 6 and the roller cage 7 are separate bodies and are pressed and connected to each other inside the outer ring 3 when the water pump bearing 1 is assembled, the ball 41 and the ball cage 6 are assembled. In addition, the assembly of the roller 42 and the roller holder 7 can be easily performed.

(3) Since the engaging recess 711 of the roller holder 7 extends in the circumferential direction and is formed in an annular shape, when the ball holder 6 and the roller holder 7 are connected, the positions in the rotation direction of each other The engagement protrusion 621 and the engagement recess 711 can be engaged without matching. Further, even when the pitch circle diameter of the ball row 410 and the pitch circle diameter of the roller row 420 are different and the rotation speed of the ball holder 6 and the rotation speed of the roller holder 7 accompanying the rotation of the shaft 2 are different, this rotation The difference in speed is absorbed by the engaging portion between the engaging recess 711 and the engaging protrusion 621, and the shaft 2 can be rotated smoothly. That is, when relative rotation occurs between the ball holder 6 and the roller holder 7, the engagement protrusion 621 remains along the engagement recess 711 while the engagement protrusion 621 remains engaged with the engagement recess 711. As a result, the ball holder 6 and the roller holder 7 absorb relative rotation, and the balls 41 and the rollers 42 are kept in smooth rotation.

[Second Embodiment]
FIG. 5 is a cross-sectional view showing cross sections of a ball cage 6A and a roller cage 7A of a water pump bearing according to a second embodiment of the present invention. 5 and the subsequent drawings, components having substantially the same functions as the components described in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

  The water pump bearing according to the second embodiment is different from the shapes of the ball cage 6 and the roller cage 7 according to the first embodiment except that the shape of the ball cage 6A and the roller cage 7A is different from that of the first embodiment. Since it is configured in the same manner as the water pump bearing 1 according to the first embodiment, the portions where the shapes of the ball cage 6A and the roller cage 7A are different will be mainly described, and the other portions will be described redundantly. Omitted.

  In the first embodiment, the engagement protrusion 621 of the ball holder 6 is provided so as to protrude inward at the tip of the extending portion 620. However, in this embodiment, the ball holder A 6A engagement protrusion 621 is provided so as to protrude outward at the tip of the extending portion 620. The outer surface 621b of the engagement protrusion 621 is formed in a tapered shape that is separated from the inner peripheral surface of the outer ring 3 toward the roller retainer 7A end.

  In the first embodiment, the engaging recess 711 of the roller retainer 7A is formed on the outer peripheral surface 71a of the first annular portion 71. However, in the present embodiment, the engaging recess 711 is the first recess. It is formed on the inner peripheral surface 71 b of the annular portion 71. The engagement recess 711 is formed in an annular shape over the entire circumference of the inner peripheral surface 71b of the first annular portion 71 and opens to the shaft 2 side.

  The ball holder 6 </ b> A and the roller holder 7 </ b> A constitute the holding member 5 </ b> A by restricting the relative movement in the axial direction when the engaging protrusion 621 engages with the engaging recess 711. The assembling method and operation of the water pump bearing according to the present embodiment including the holding member 5A are the same as those in the first embodiment.

  Also in the present embodiment, the movement of the roller retainer 7 toward the second seal member 82 is restricted, so that wear and deformation of the second seal member 82 are suppressed, and in the case of the first embodiment. The same operation and effect as above can be obtained.

[Third Embodiment]
FIG. 6 is a cross-sectional view showing cross sections of a ball cage 6B and a roller cage 7 of a water pump bearing according to a third embodiment of the present invention. The water pump bearing according to the third embodiment is the water pump according to the first embodiment, except that the shape of the ball cage 6B is different from the shape of the ball cage 6 according to the first embodiment. Since it is configured in the same manner as the bearing 1 for the ball, the portion where the shape of the ball cage 6B is different will be mainly described, and the redundant description of the other portions will be omitted.

  In the first embodiment, the connecting piece 62 of the ball holder 6 is formed on the distal end side of the protrusion 61. However, in this embodiment, the connecting piece 62 is on the opposite side of the protrusion 60 in the base 60. It protrudes in the opposite direction from the protrusion 61 toward the roller holder 7 from the end face. In other words, in the ball cage 6B according to the present embodiment, the protrusions 61 protrude from the base 60 toward the first seal member 81, and a plurality of (from the second seal member 82 side) to the opposite side (second seal member 82 side). Three) connecting pieces 62 protrude. As in the first embodiment, the connecting piece 62 is provided so that the engaging protrusion 621 protrudes inward at the distal end portion of the extending portion 620.

  The engagement protrusion 621 of the ball holder 6B engages with the engagement recess 711 of the roller holder 7 configured in the same manner as in the first embodiment, and the ball holder 6B, the roller holder 7 and Are connected to form the holding member 5B. The holding member 5B is assembled in the same manner as in the first embodiment except that the ball holder 6B is inserted between the outer ring 3 and the shaft 2 from the end on the seal fitting groove 3d side.

  Also in the present embodiment, the movement of the roller retainer 7 toward the second seal member 82 is restricted, so that wear and deformation of the second seal member 82 are suppressed, and in the case of the first embodiment. The same operation and effect as above can be obtained.

[Fourth Embodiment]
FIG. 7 is a cross-sectional view showing a cross section of a holding member 5C of a water pump bearing according to a fourth embodiment of the present invention. The water pump bearing according to the fourth embodiment includes a ball holding portion 5a as a first holding portion in which a holding hole 6a for holding a plurality of balls 41 in a rollable manner is formed, and a plurality of rollers 42. A roller holding part 5b as a second holding part in which a holding hole 7a for holding the roll is formed is integrally connected via a connecting part 50.

  The ball holding portion 5a integrally includes an annular base portion 60 and a plurality of protrusion portions 61 protruding from the base portion 60, for example, like the ball holder 6B according to the third embodiment. The protrusion 61 protrudes toward the first seal member 81, and a pair of protrusions 63 and 63 for preventing the ball 41 accommodated in the holding hole 6 a from being formed at the tip of the protrusion 61. Has been.

  The roller holding portion 5b includes, for example, the first annular portion 71 formed on the ball holding portion 5a side of the holding hole 7a and the second of the holding hole 7a, like the roller holder 7 according to the first embodiment. The second annular portion 72 formed in the sealing member 82 and a plurality of column portions 73 that connect the first annular portion 71 and the second annular portion 72 in the radial direction are integrally provided.

  The base portion 60 of the ball holding portion 5a and the first annular portion 71 of the roller holding portion 5b are integrally connected by an annular connecting portion 50 to constitute a holding member 5C. The holding member 5 is assembled in a holding member 5C in which a plurality of balls 41 are arranged at equal intervals between the shaft 2 and the outer ring 3 and a roller 42 is accommodated in a plurality of holding holes 7a of the roller holding portion 5b. Is inserted from the end on the seal fitting groove 3d side.

  Also according to the present embodiment, by restricting the movement of the holding member 5C including the roller holding portion 5b toward the second seal member 82, wear and deformation of the second seal member 82 are suppressed, and the first The same operations and effects as those of the embodiment can be obtained. In addition, since the ball holding portion 5a and the roller holding portion 5b are integrated, the number of parts can be reduced, and assembling can be facilitated.

  As mentioned above, although the bearing for water pumps of this invention was demonstrated based on the said 1st thru | or 4th embodiment, this invention is not limited to the said 1st thru | or 4th embodiment, The summary The present invention can be implemented in various forms without departing from the scope of the invention, and other modifications such as those shown below are possible.

(1) In each of the above embodiments, the case where the number of the holding holes 6a for holding the balls 41 is 7 and the number of the holding holes 7a for holding the rollers 42 is 12 has been described. , 7a is not limited to this, and can be set as appropriate according to the load acting on the bearing for the water pump.

(2) In each of the above embodiments, the case where the ball row 410 is arranged on the impeller 11 side and the roller row 420 is arranged on the belt pulley 10 side has been described. The roller row 420 may be disposed on the impeller 11 side.

DESCRIPTION OF SYMBOLS 1 ... Water pump bearing, 2 ... Shaft, 2a ... First inner raceway surface, 2b ... Second inner raceway surface, 3 ... Outer ring, 3a ... First outer raceway surface, 3b ... Second outer raceway surface 3c, 3d ... seal fitting groove, 5, 5A, 5B, 5C ... holding member, 5a ... ball holding portion, 5b ... roller holding portion, 6, 6A, 6B ... ball holder, 6a ... holding hole, 6b ... inner surface, 7, 7A ... roller holder, 7a ... holding hole, 9 ... pump housing, 10 ... belt pulley, 11 ... impeller, 12 ... pulley sheet, 13 ... seal member, 41 ... ball, 42 ... roller, 50 ... Connection part 60 ... Base part 61 ... Projection part 62 ... Connection piece 63 ... Projection piece 71 ... First annular part 71a ... Outer peripheral surface 71b ... Inner peripheral surface 72 ... Second annular part 72a ... end face, 73 ... pillar, 81 ... first seal member, 82 ... second seal member, 9 ... Bearing assembly cylinder, 100 ... Water pump, 110 ... Base part, 111 ... Blade part, 410 ... Ball row, 412 ... Taper part, 420 ... Roller row, 620 ... Extension part, 621 ... Engagement projection, 621a ... Inner surface, 621b ... outer surface, 711 ... engagement recess, 712 ... tapered portion, 712a ... inclined surface, 810 ... core metal, 811 ... seal portion, 812 ... base piece, 813,814 ... first and second seal lips, 820 ... Metal core, 821 ... Seal part, 822 ... Base piece, 823, 824 ... First and second ... Seal lip, O ... Rotation axis

Claims (5)

An outer member having a first outer raceway surface and a second outer raceway surface on an inner peripheral surface;
An inner member having a first inner raceway surface and a second inner raceway surface on an outer peripheral surface;
A plurality of spherical first rolling elements disposed between the first outer raceway surface and the first inner raceway surface;
A plurality of cylindrical second rolling elements disposed between the second outer ring raceway surface and the second inner ring raceway surface;
A holding member having a first holding part that holds the plurality of first rolling elements in a rollable manner and a second holding part that holds the plurality of second rolling elements in a rollable manner;
A seal member facing the second holding portion in the axial direction and sealing a space between the outer member and the inner member;
The holding member is configured such that the axial movement of the second holding part toward the seal member is restricted by connecting the first holding part and the second holding part. . The first holding part and the second holding part are separate bodies, and a recess formed in one holding part of the first holding part and the second holding part is provided in the other holding part. The formed protrusions are engaged and connected,
The double row bearing according to claim 1. The recess extends in the circumferential direction.
The double row bearing according to claim 2. The first holding part and the second holding part are integrally connected,
The double row bearing according to any one of claims 1 to 3. The inner member is a shaft provided with a blade for circulating engine cooling water at an end, and the outer member is attached to a housing of a water pump.
The double row bearing according to claim 1.

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