Bearing assembly for in-wheel motor

Abstract

The present invention relates to a bearing assembly for an in-wheel motor, the bearing assembly comprising: a bearing; a rotor part which is coupled to a rotating race of the bearing and rotated integrally with the rotating race; a housing which is coupled to a stationary race of the bearing; and a resolver stator which is coupled to the housing and senses a resolver rotor provided in the rotor part, wherein: the rotor part includes an encoder rotor and the resolver rotor; and the encoder rotor and the resolver rotor are provided to be integrally coupled to the rotating race.

Description

Bearing assembly for in-wheel motor

[0001] The present invention relates to a bearing, and more particularly, to a bearing assembly for an in-wheel motor.

[0002] Unlike gasoline or diesel vehicles, where power is transmitted through the engine, transmission, and driveshaft to drive the wheels, in-wheel motors transmit power directly to the wheels via a motor located within the wheel rim. Therefore, in-wheel motors can eliminate drive and power transmission components like the engine, transmission, and differential, reducing vehicle weight and energy loss during power transmission.

[0003] Fig. 1 is a schematic cross-sectional view illustrating an in-wheel motor installed inside a wheel of a vehicle. As illustrated in Fig. 1, the in-wheel motor has a stator (17) and a rotor (18) arranged to face each other. A coil (17a) is wound around the stator (17), and a permanent magnet (18a) is provided on the rotor (18). The stator (17) of the in-wheel motor is fixed to a knuckle (3) via a stator bracket (8). The knuckle (3) is fixed to the vehicle body directly or by means of other elements. The stator (17) of the in-wheel motor is also fixed to the vehicle body via the knuckle (3).

[0004] The rotor (18) of the in-wheel motor is fixed to the wheel (14) via the rotor bracket (13). When the in-wheel motor operates and the rotor (18) rotates relative to the stator (17), the wheel (14) also rotates. The rotating part of the wheel bearing is fixedly coupled to the wheel (14) so ​​as to rotatably support the wheel (14), and the fixed part of the wheel bearing is fixedly coupled to the knuckle (3).

[0005] In the structure of Fig. 1, the hub (5) of the wheel bearing is fixedly coupled to the wheel (14), and the outer ring (7) is fixedly coupled to the knuckle (3). The knuckle (3) has a hole in the center into which the wheel bearing is inserted. A hole through which a bolt (9) passes is formed around the center hole of the knuckle (3). A hole through which a bolt (9) passes is also formed in the stator bracket (8) to which the stator (17) is fixed. A flange (7a) is formed to extend radially outwardly on the outer ring (7) of the wheel bearing. A hole through which a bolt (9) is screwed is formed in the flange (7a). From the body side, the knuckle (3), the stator bracket (8), and the flange (7a) of the outer ring (7) are arranged in that order and fixed to each other by the bolt (9).

[0006] The above rotor (18) is supported by a rotor bracket (13), and the rotor bracket (13) is fixed to the wheel bearing hub (5), brake disc (12), and wheel (14) by bolts and nuts.

[0007] In the above in-wheel motor, a resolver is installed to measure the relative position angle of the rotor (18) with respect to the stator (17) in order to produce motor output with maximum rotational power, and an encoder device is installed to measure the rotational speed of the hub (5) for ABS brake control, etc. However, the installation structure is complicated, and the number of parts and weight increase, which causes a decrease in energy efficiency.

[0008] The present invention has been proposed to solve the problems of the above-mentioned prior art, and aims at a bearing assembly for an in-wheel motor that is easy to assemble with an integrated structure and has a lightweight structure.

[0009] For the above purpose, the present invention includes a bearing, a rotor part coupled to a rotating wheel of the bearing and rotating integrally with the rotating wheel, a housing coupled to a stationary wheel of the bearing, and a resolver stator coupled to the housing and sensing a resolver rotor provided in the rotor part;

[0010] The present invention provides a bearing assembly for an in-wheel motor, characterized in that the rotor part includes an encoder rotor and a resolver rotor, and the encoder rotor and the resolver rotor are integrally coupled to a rotating wheel.

[0011] In the above, the resolver rotor is made of a metal material, and the rotor part is characterized in that the resolver rotor is inserted and the encoder rotor is combined with the resolver rotor and injection-molded to form an integral body.

[0012] In the above, the resolver rotor is formed by bending a metal sheet and includes a first cylindrical portion coupled to a rotating wheel, a bend portion formed by being radially inwardly bent at an axial inner end of the first cylindrical portion, and a plurality of slits are formed along a circumferential direction on a radially inner side of the bend portion to provide a plurality of grilles; the encoder rotor is characterized by including a second cylindrical portion coupled to the first cylindrical portion, and an outer surface portion coupled to an outer surface of the bend portion, which is formed in a form of being bent inwardly at an end of the second cylindrical portion.

[0013] In the above, the resolver rotor is characterized in that it has an inner coupling portion at the center, and the radially inner ends of the plurality of bars are coupled to the inner coupling portion.

[0014] In the above, the resolver rotor is characterized in that it has an inclined portion that is inclined and extended from the inner end of the bending portion, and a circular plate portion in the radial direction inside the inclined portion, a plurality of slits are formed in the circumferential direction in the circular plate portion to provide a plurality of lattices, and an inner coupling portion is provided at the center of the circular plate portion so that a radially inner end of the lattices is coupled to the inner coupling portion.

[0015] In the above, the rotor part is made of metal, and includes a rotor coupling part coupled to a bearing rotating wheel, a rotor annular part provided on an axial inner side of the rotor coupling part, and a plurality of radially extending grilles provided on a radially inner side of the rotor annular part along a circumferential direction, and a radially extending slit is formed between the grilles; a plurality of encoder holes are formed on the rotor annular part along a circumferential direction; the plurality of grilles become a resolver rotor, and the rotor annular part becomes an encoder rotor.

[0016] In the above, the rotor part has an inner coupling part at the center; and the radially inner ends of the plurality of lattices are characterized in that they are coupled to the inner coupling part.

[0017] In the above, the rotor annular portion further includes an inclined portion extending axially inwardly from a radially inner end portion; the plurality of lattices are provided along a circumferential direction on a disc portion provided on the inner side of the rotor annular portion, and an inner coupling portion is provided at the center of the disc portion such that the radially inner end portion of the lattices is coupled to the inner coupling portion.

[0018] In the above, the housing is concave and opens toward the axial outer side, and includes a body coupling portion provided at an outer end and coupled to a fixed wheel, a rotation sensor insertion portion in which a rotation sensor is inserted at a position facing the encoder rotor, and a connector installation portion in which a connector, which is a connection terminal connected to the resolver stator, is installed;

[0019] The resolver stator is installed on the axial inner side of the housing, and the resolver stator is characterized in that it faces the resolver rotor.

[0020] In the above, the housing is characterized in that it has an installation jaw portion that protrudes axially outwardly on the inside and has an installation hole formed therein, and the resolver rotor is provided on the installation jaw portion through a connecting member that is fastened to the installation hole.

[0021] In the above, the housing includes a concave and outwardly open metal housing body, and a sensor body made of synthetic resin that is injection-molded and joined to the housing body as an insert;

[0022] The above housing body has the above body joining portion, and has a body jaw portion that is hooked to the end of a fixed wheel on the outer side in the axial direction, and a first housing hole and a second housing hole are formed axially through the bottom;

[0023] The above rotation sensor insertion part and connector installation part are provided in the sensor body;

[0024] The above rotation sensor insertion portion protrudes outward in the axial direction through the first housing hole and has an inwardly concave opening on the inside so that the rotation sensor can be inserted, and the connector installation portion is located on the inside of the second housing hole, and one end of the connection line is connected to the resolver stator through the second housing hole and the other end is connected to a connector provided in the connector installation portion.

[0025] In the above, the sensor body is characterized in that it has a body concave portion that is concave outwardly on the inside of the second housing hole, and the connector installation portion is provided on the inside of the body concave portion.

[0026] According to the bearing assembly for an in-wheel motor according to the present invention, the assembly can be simply and quickly accomplished through an integrated structure, and a lightweight structure is possible. In addition, since the resolver target projection, which is a lattice, has no free end, the lightweight structure is possible, but deformation is unlikely to occur, and vibrations such as shaking do not occur even at high speed rotation.

[0027] Figure 1 is a cross-sectional view showing a conventional in-wheel motor.

[0028] Figure 2 is a perspective view illustrating a bearing assembly for an in-wheel motor according to the present invention.

[0029] Figure 3 is a cross-sectional view along line AA of Figure 2.

[0030] Figure 4 is a perspective view showing a housing provided in a bearing assembly for an in-wheel motor of the present invention.

[0031] Figure 5 is a perspective view showing the housing body included in the housing shown in Figure 4.

[0032] Figure 6 is a perspective view showing a rotor part provided in a bearing assembly for an in-wheel motor of the present invention.

[0033] Figure 7 illustrates a state in which a resolver stator is coupled to a housing provided in a bearing assembly for an in-wheel motor of the present invention.

[0034] Figure 8 is an enlarged view of part “A” of Figure 3.

[0035] Fig. 9 is a perspective view showing a modified example of a rotor part provided in a bearing assembly for an in-wheel motor of the present invention.

[0036] All technical and scientific terms used in the description of the present invention, unless otherwise defined, have the meanings commonly understood by those of ordinary skill in the art to which this disclosure pertains. All terms used in this disclosure have been selected for the purpose of more clearly explaining this disclosure and are not intended to limit the scope of rights under this disclosure.

[0037] Expressions such as “comprising,” “having,” and the like used in the description of the present invention should be understood as open-ended terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included.

[0038] The singular forms used in the description of the present invention may include plural meanings unless otherwise stated, and the same applies to the singular forms set forth in the claims.

[0039] The expressions “first,” “second,” etc. used in the description of the present invention are used to distinguish between multiple components, and do not limit the order or importance of the components.

[0040] When it is mentioned in the description of the present invention that a component is "connected" or "coupled" to another component, it should be understood that the component can be directly connected or coupled to the other component, or can be connected or coupled via a new other component.

[0041] Referring to the attached drawings below, a bearing assembly for an in-wheel motor of the present invention is described in detail.

[0042] FIG. 2 is a perspective view illustrating a bearing assembly for an in-wheel motor according to the present invention, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, FIG. 4 is a perspective view illustrating a housing provided in the bearing assembly for an in-wheel motor of the present invention, FIG. 5 is a perspective view illustrating a housing body included in the housing illustrated in FIG. 4, FIG. 6 is a perspective view illustrating a rotor part provided in the bearing assembly for an in-wheel motor of the present invention, FIG. 7 illustrates a state in which a resolver stator is coupled to a housing provided in the bearing assembly for an in-wheel motor of the present invention, FIG. 8 is an enlarged view of part “A” of FIG. 3, and FIG. 9 is a perspective view illustrating a modified example of the rotor part provided in the bearing assembly for an in-wheel motor of the present invention.

[0043] In the following description, the horizontal direction of Fig. 3 is described as the axial direction, the left side of Fig. 3 is described as the outside, and the right side is described as the inside.

[0044]

[0045] As shown in FIGS. 2 and 3, a bearing assembly (100) for an in-wheel motor according to the present invention comprises a bearing (170), a rotor (140), a housing (110), a resolver stator (120), and a connector (130).

[0046] As illustrated in Fig. 1, the bearing may be installed so that the hub acts as a rotating wheel and the outer ring acts as a stationary wheel, or the hub acts as a stationary wheel and the outer ring acts as a rotating wheel. The present invention is described as having a structure in which the hub rotates. Therefore, the hub acts as a rotating wheel and the outer ring acts as a stationary wheel.

[0047] As shown in Fig. 3, the bearing (170) includes a hub (173), an outer ring (171), a rolling element (175), and a cage.

[0048] An inner ring raceway (1731) is formed on the outer surface of the hub (173), and an inner ring member (174) is further provided on the radially outer side of the hub (173) and is spaced axially inward from the inner ring raceway (1731). The inner ring member (174) is cylindrical, and an inner ring raceway (1741) is formed on the outer surface. The inner ring raceway (1741) of the inner ring member (174) is formed to face and be spaced axially from the inner ring raceway (1731) formed on the hub (173). By providing the inner ring member (174), assembly of the bearing (170) can be easily achieved.

[0049] In Fig. 3, drawing reference numeral 1736 illustrates a forming part for fixing a separately provided inner ring member (174).

[0050] The above hub (173) may be formed with a plurality of inner ring tracks (1731) spaced apart axially on the outer diameter surface without the inner ring member (174). Two inner ring tracks (1731) are formed axially spaced apart on the hub (173).

[0051] The above hub (173) is provided with a second flange (1733) axially spaced from the inner ring raceway (1731). The second flange (1733) is provided to extend outward from the radially outer side of the hub (173). A plurality of through holes spaced apart along the circumferential direction and penetrating in the axial direction are formed in the second flange (1733).

[0052] The outer ring (171) is provided as a hollow body. A plurality of outer ring raceways (1711) are formed on the inner surface of the outer ring (171) and spaced apart in the axial direction. Two outer ring raceways (1711) are formed on the outer ring (171) and spaced apart in the axial direction. The outer ring (171) is provided with a first flange (1713) on the radially outer side. The first flange (1713) is provided to extend outward from the radially outer side of the outer ring (171). The first flange (1713) is positioned spaced apart inwardly in the axial direction from the second flange (1733). A plurality of through holes are formed on the first flange (1713) and spaced apart in the circumferential direction and extending axially.

[0053] The above hub (173) and outer ring (171) are bolted to a plurality of holes formed in the first flange (1713) and the second flange (1733) to install a bearing (170) (see Fig. 1).

[0054] The above-described rolling element (175) is formed of a ball or roller. The rolling elements (175) are provided in a plurality along the circumferential direction between the inner ring raceway (1731) formed on the hub (173) and the inner ring raceway (1741) and the outer ring raceway (1711) of the inner ring member (174). The plurality of rolling elements (175) are provided arranged in a plurality of rows. As illustrated in Fig. 3, inner ring raceways (1731, 1741) are formed on the hub (173) and the inner ring member (174), and two outer ring raceways (1711) are formed on the outer ring (171), so that the rolling elements (175) are provided in two rows.

[0055] When two inner ring tracks (1731) are formed axially apart from each other on the hub (173), two inner ring tracks (1731) are formed on the hub (173), and two outer ring tracks (1711) are formed on the outer ring (171), so that the rolling elements (175) can be provided in two rows.

[0056] The above cage (not shown) is provided between the hub (173) and the outer ring (171) to maintain the circumferential spacing of the rolling element (175).

[0057] In Fig. 3, reference numeral 177 illustrates a seal that prevents the intrusion of foreign substances and leakage of lubricant.

[0058] The above rotor part (140) is circular and is formed concavely toward the axial outer side. The rotor part (140) is coupled to the inner ring member (174) and rotates integrally with the hub (173). The rotor part (140) has the axial inner outer diameter surface of the inner ring member (174) inserted into the rotor part (140). The rotor part (140) is provided by being coupled to the outer diameter surface of the inner ring member (174). The rotor part (140) is force-fitted to the inner ring member (174).

[0059] In a structure in which a separate inner ring member (174) is not provided axially inside the hub (173), the rotor part (140) is coupled to the hub (173) and rotates integrally with the hub (173). The inner end of the hub (173) is inserted into the rotor part (140), so that the rotor part (140) is coupled to the hub (173). The rotor part (140) is coupled to the outer diameter surface on the axially inside side of the hub (173). The rotor part (140) is forcefully fitted to the hub (173).

[0060] As illustrated in FIGS. 6 and 8, the rotor part (140) includes a resolver rotor (141) and an encoder rotor (143). The resolver rotor (141) and the encoder rotor (143) are formed as one piece and are coupled to the inner ring member (174). If the inner ring member (174) is not provided, the resolver rotor (141) and the encoder rotor (143) may be formed as one piece and coupled to the hub (173).

[0061] The above resolver rotor (141) is made of a metal material such as stainless steel. The resolver rotor (141) is formed by bending a metal sheet and joining it to an inner ring member (174) in a circular shape. The resolver rotor (141) includes a first cylindrical portion (1411), a bend portion (1413), an inclined portion (1415), and a disc portion.

[0062] The above first cylindrical portion (1411) is formed in a cylindrical shape. An inner ring member (174) is inserted into the first cylindrical portion (1411) by a forceful fit. If the inner ring member (174) is not provided, a hub (173) is inserted into the first cylindrical portion (1411) by a forceful fit.

[0063] The above-mentioned bending portion (1413) is formed in a circular shape. The above-mentioned bending portion (1413) is formed by bending radially inwardly from the axial inner end of the first cylindrical portion (1411).

[0064] The above-mentioned inclined portion (1415) is provided at the radially inner end of the above-mentioned bending portion (1413). The above-mentioned inclined portion (1415) extends axially inwardly from the radially inner end of the above-mentioned bending portion (1413). The above-mentioned inclined portion (1415) is provided radially inwardly so that the diameter becomes smaller as it goes axially inward.

[0065] The above-mentioned disc portion is provided in the shape of a disc. The disc portion is provided connected to the axial inner end of the inclined portion (1415). The disc portion is provided connected to the axial inner end of the inclined portion (1415) and radially inside the inclined portion (1415). The disc portion includes an inner connecting portion (1412) and a window frame (1417).

[0066] The inner joint portion (1412) is provided in a circular shape. The inner joint portion (1412) is provided at the center, radially inwardly spaced from the inner end of the inclined portion (1415).

[0067] The above-mentioned lattice (1417) is provided in a form extending radially outward along the edge of the inner joint portion (1412). The lattice (1417) is provided in plurality spaced apart from each other along the edge of the inner joint portion (1412). The lattice (1417) is provided on the radially inner side of the inclined portion (1415). The lattice (1417) is provided between the inclined portion (1415) and the inner joint portion (1412). The lattice (1417) is provided such that the radially inner end is connected to the inner joint portion (1412) and the radially outer end is connected to the inclined portion (1415).

[0068] Between the above bars (1417), a slit (1419) is formed along the circumference of the inner joint (1412) and extends radially. The slits (1419) are provided in multiple numbers and spaced apart from each other.

[0069] The above-mentioned lattice (1417) may be provided with a plurality of slits (1419) spaced apart along the circumferential direction on the radially inner side of the bending portion (1413) in the case where the above-mentioned inclined portion (1415) is not provided. In this case, the lattice (1417) is provided such that the radially inner end is connected to the inner connecting portion (1412) and the radially outer end is connected to the bending portion (1413).

[0070] Since the rotor part (140) is provided with the inner coupling part (1412), the radially outer side of the window frame (1417) is connected to the inclined part (1415) or the bent part (1413) and the radially inner side is connected to the inner coupling part (1412). Therefore, the window frame (1417) does not have a structure with a free end, and therefore is not easily deformed or damaged by external impact. In addition, even when rotating at high speed, vibrations such as shaking or noise can be suppressed.

[0071] The number of the above bars (1417) and slits (1419) is preferably formed such that the sum of the bars (1417) and slits (1419) is a multiple including a multiple of the number of motor poles, and is preferably formed at least as a divisor of the number of motor poles. By forming the number of the bars (1417) and slits (1419) such that the sum of the bars (1417) and slits (1419) is a multiple including a multiple of the number of motor poles or a divisor, a rotation sensor that senses the resolver rotor (141) is connected to a control unit (not shown) so that control calculations for motor rotation are easily performed.

[0072] The above encoder rotor (143) is made of magnetic rubber having a plurality of N poles and S poles alternately arranged along the circumferential direction of the resolver rotor (141).

[0073] The above encoder rotor (143) is composed of a second cylindrical portion (1431) and an outer surface portion (1433).

[0074] The second cylindrical portion (1431) is provided in a cylindrical shape. The second cylindrical portion (1431) is provided by being coupled to the first cylindrical portion (1411) of the resolver rotor (141). The second cylindrical portion (1431) is coupled to the outer diameter of the first cylindrical portion (1411). A protruding end (1414) extending radially outward is further provided at the outer end of the first cylindrical portion (1411). Since the first cylindrical portion (1411) has the protruding end (1414), the second cylindrical portion (1431) can be firmly coupled to the first cylindrical portion (1411).

[0075] The above outer surface portion (1433) is provided in an annular shape. The above outer surface portion (1433) is provided in a form that is radially inwardly bent from the end of the second cylindrical portion (1431). The above outer surface portion (1433) is coupled to the axial inner surface of the bent portion (1413). The above outer surface portion (1433) is provided with N and S poles alternately along the circumferential direction, so that it has magnetism.

[0076] The above rotor part (140) is formed integrally by injection molding the resolver rotor (141) into an insert and the encoder rotor (143) is coupled to the resolver rotor (141).

[0077] The above rotor part (140) may be formed in a shape as shown in FIG. 9.

[0078] The above rotor part (140) is made of a metal material such as stainless steel. The above rotor part (140) includes a rotor coupling part (142), a rotor annular part (144), an inclined part (146), and a disc part.

[0079] The above rotor coupling part (142) is formed in a cylindrical shape. The rotor coupling part (142) is coupled to the inner ring member (174) of the bearing (170). The inner ring member (174) is inserted into the rotor coupling part (142) by a forceful fit. In the case where a separate inner ring member (174) is not provided in the hub (173), the hub (173) is inserted into the rotor coupling part (142) by a forceful fit.

[0080] The above-mentioned rotor annular portion (144) is formed in an annular shape. The rotor annular portion (144) is provided on the axial inner side of the rotor coupling portion (142). The rotor annular portion (144) is provided by being radially bent inward at the axial inner end of the rotor coupling portion (142). A plurality of encoder holes (1441) penetrating axially along the circumference are formed in the rotor annular portion (1444). The encoder holes (1441) are formed to be spaced apart at equal intervals along the circumference of the rotor annular portion (1444). The encoder holes (1441) are formed at a position spaced apart radially outward from the slit (145).

[0081] The above-mentioned inclined portion (146) is provided at the radially inner end of the rotor annular portion (144). The above-mentioned inclined portion (146) extends axially inwardly from the radially inner end of the rotor annular portion (144). The above-mentioned inclined portion (146) is provided to be radially inwardly inclined so that the diameter becomes smaller as it goes axially inward.

[0082] The above-mentioned disc portion is provided in the shape of a disc. The disc portion is provided by being connected to the axial inner end of the inclined portion (146). The disc portion is provided on the radially inner side of the inclined portion (146) by being connected to the axial inner end of the inclined portion (146). The disc portion includes an inner connecting portion (147) and a window frame (148).

[0083] The inner joint portion (147) is provided in a circular shape. The inner joint portion (147) is provided at the center, radially inwardly spaced from the inner end of the inclined portion (146).

[0084] The above-mentioned lattice (148) is provided in a form extending radially outward along the edge of the inner joint portion (147). The lattice (148) is provided in plurality spaced apart from each other along the edge of the inner joint portion (147). The lattice (148) is provided on the radially inner side of the inclined portion (146). The lattice (148) is provided between the inclined portion (146) and the inner joint portion (147). The lattice (148) is provided such that the radially inner end is connected to the inner joint portion (147) and the radially outer end is connected to the inclined portion (146).

[0085] Between the above bars (148), slits (145) are formed along the circumference and extend radially. The slits (145) are provided in multiple numbers.

[0086] The above-mentioned lattice (148) extends radially inward from the radially inner side of the rotor annular portion (144) when the inclined portion (146) is not provided, and a plurality of slits (1419) are formed spaced apart along the circumferential direction, and may be provided in multiple numbers. In this case, the lattice (148) is provided such that the radially inner end is connected to the inner connecting portion (147), and the radially outer end is connected to the rotor annular portion (144).

[0087] The rotor part (140) of the above-mentioned form has a plurality of bars (148) as a resolver rotor (141), and the rotor annular part (144) as an encoder rotor (143).

[0088] The above-described rotor part (140) is provided with a resolver rotor (141) formed of a plurality of bars (148) on the radially inner side, and a rotor annular part (144) in which a plurality of encoder holes (1441) are formed along the circumference on the radially outer side integrally, and since the rotor annular part (144) functions as an encoder rotor (143), the resolver rotor (141) and the encoder rotor (143) are provided integrally in the rotor part (140). Therefore, the bearing assembly (100) for an in-wheel motor according to the present invention can be easily, simply, and quickly assembled with the rotor part (140).

[0089] As illustrated in FIGS. 2 to 4, the housing (110) is provided coupled to the outer ring (171) of the bearing (170). The housing (110) has a concave shape and an opening formed toward the axial outer side. The housing (110) includes a housing body (111) and a sensor body (113).

[0090] As illustrated in Fig. 5, the housing body (111) is made of a metal material such as aluminum. The housing body (111) is provided as a concave, outwardly open, cylindrical hollow body. A first housing hole (1115) and a second housing hole (1117) that penetrate in the axial direction are formed in the body bottom portion (114) of the housing body (111).

[0091] The above housing body (111) is provided with a body joining part (1111), a body jaw part (1113), and an installation jaw part (1119).

[0092] The above body coupling portion (1111) is provided on the outer end of the housing body (111) and is coupled to the outer ring (171). The outer ring (171) is provided with a cylindrical outer ring extension portion (1715) extending axially inwardly on the axial inner side, and the housing body (111) is coupled to the outer ring (171) by having the body coupling portion (1111) inserted into the outer ring extension portion (1715).

[0093] The above body jaw portion (1113) protrudes radially outward on the outer surface of the housing body (111). The body jaw portion (1113) is formed to extend along the circumferential direction on the outer surface of the housing body (111). The body jaw portion (1113) may be formed as a plurality of protrusions spaced apart along the circumferential direction on the outer surface of the housing body (111). The body coupling portion (1111) is inserted into the outer ring extension portion (1715), and the body jaw portion (1113) is provided to be hooked onto the end of the outer ring (171).

[0094] The above-mentioned installation jaw portion (1119) is formed to protrude outwardly in the axial direction from the main body bottom portion (114) of the housing body (111). An installation hole (1118) penetrating in the axial direction is formed in the above-mentioned installation jaw portion (1119). A resolver stator (120) is provided in the above-mentioned installation jaw portion (1119) through a connecting member (112) that is fastened to the installation hole (1118).

[0095] The above sensor body (113) is made of synthetic resin material. The sensor body (113) is injection-molded by joining the housing body (111) to the housing body (111) as an insert.

[0096] The above sensor body (113) is provided with a rotation sensor insertion portion (1131), a body concave portion (1135), and a connector installation portion (1133).

[0097] The above rotation sensor insertion portion (1131) is provided at a position facing the encoder rotor (143) so that a rotation sensor is inserted therein. The rotation sensor insertion portion (1131) is provided at a position facing the outer surface (1433) of the encoder rotor (143). The rotation sensor insertion portion (1131) protrudes outward in the axial direction through the first housing hole (1115). The rotation sensor insertion portion (1131) is opened inwardly so that the inner side thereof is concave so that a rotation sensor is inserted therein.

[0098] The above-mentioned body concave portion (1135) is formed inwardly concavely on the inside of the second housing hole (1117).

[0099] The connector installation portion (1133) is located on the inside of the second housing hole (1117). The connector installation portion (1133) is provided on the inside of the body concave portion (1135). A connector (130), which is a connection terminal connected to the resolver stator (120), is installed on the connector installation portion (1133).

[0100] The connector (130) provided in the above connector installation part (1133) has one side of the connection line connected to the resolver stator (120) through the second housing hole (1117) and the other side connected to the connector (130) provided in the connector installation part (1133).

[0101] The above resolver stator (120) is coupled to the housing (110) and senses the resolver rotor (141) provided in the rotor part (140). The resolver stator (120) is installed on the axial inner side of the housing (110). The resolver stator (120) is fixedly installed to the installation jaw part (1119) of the housing body (111) by a coupling member (112). The resolver stator (120) is installed spaced apart from the main body bottom part (114) of the housing body (111). The resolver stator (120) is installed facing the resolver rotor (141).

[0102] The above resolver stator (120) is fixedly installed on the installation jaw (1119) by the above connecting member (112) and is spaced apart from the main body bottom (114) of the housing body (111), and the resolver rotor (141) is spaced apart from the resolver stator (120) in the axial direction by the connecting member (112), so that overheating can be prevented during heat generation.

[0103] The above resolver stator (120) and resolver rotor (141) are resolvers, and when the bearing assembly (100) for an in-wheel motor according to the present invention is installed in an in-wheel motor, the rotation of the resolver rotor (141) is sensed by the resolver stator (120), and the relative position angle of the rotor with respect to the stator of the motor is measured.

[0104]

[0105] While the bearing assembly for an in-wheel motor according to the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and anyone skilled in the art will understand that various modifications and equivalent implementations are possible. Therefore, the true scope of technical protection should be determined by the technical spirit of the appended claims.

[0106] The bearing assembly for an in-wheel motor according to the present invention has an integrated structure that allows for simple and quick assembly, making work efficient. In addition, since the resolver target's projection, the lattice, has no free end, it can be made into a lightweight structure while being difficult to deform. In addition, even at high speed rotation, vibrations such as shaking do not occur, improving product performance.

Claims

1. It includes a bearing (170), a rotor part (140) that is coupled to the rotating wheel of the bearing (170) and rotates integrally with the rotating wheel, a housing (110) that is coupled to the fixed wheel of the bearing (170), and a resolver stator (120) that is coupled to the housing (110) and senses a resolver rotor (141) provided in the rotor part (140); A bearing assembly (100) for an in-wheel motor, characterized in that the above-mentioned rotor (140) includes an encoder rotor (143) and a resolver rotor (141), and the encoder rotor (143) and the resolver rotor (141) are integrally coupled to a rotating wheel.

2. In the first paragraph, the resolver rotor (141) is made of a metal material, and the rotor part (140) is formed by injection molding an encoder rotor (143) that is integrally formed by inserting the resolver rotor (141) into the resolver rotor (141).

3. In the second paragraph, the resolver rotor (141) includes a first cylindrical portion (1411) formed by bending a metal sheet and coupled to a rotating wheel, and a bent portion (1413) formed by radially bending inwardly from an axial inner end of the first cylindrical portion (1411), and a plurality of slits are formed along a circumferential direction on the radially inner side of the bent portion (1413) to provide a plurality of grilles (1417); and the encoder rotor (143) includes a second cylindrical portion (1431) coupled to the first cylindrical portion (1411), and an outer surface portion (1433) provided in a form bent inwardly from an end of the second cylindrical portion (1431) and coupled to an outer surface of the bent portion (1413).

4. In the third paragraph, the resolver rotor (141) has an inner coupling portion (1412) at the center, and the radially inner ends of the plurality of bars (1417) are coupled to the inner coupling portion (1412), which is a bearing assembly (100) for an in-wheel motor.

5. In the third paragraph, the resolver rotor (141) has an inclined portion (1415) that is inclinedly extended from the inner end of the bending portion (1413), and a circular plate portion in the radial direction of the inclined portion (1415), a plurality of slits (1419) are formed in the circumferential direction of the circular plate portion to provide a plurality of bars (1417); and an inner coupling portion (1412) is provided at the center of the circular plate portion, and a radially inner end of the bars (1417) is coupled to the inner coupling portion (1412).

6. In the first paragraph, the rotor portion (140) is made of metal, and includes a rotor coupling portion (142) coupled to a bearing rotating wheel, a rotor annular portion (144) provided on the axial inner side of the rotor coupling portion (142), and a plurality of radially extending grilles (148) provided along a circumferential direction on the radially inner side of the rotor annular portion (144), such that a radially extending slit (145) is formed between the grilles (148); a plurality of encoder holes (1441) are formed along a circumferential direction in the rotor annular portion (144); and the plurality of grilles (148) become a resolver rotor (141), and the rotor annular portion (144) becomes an encoder rotor (143). A bearing assembly (100) for an in-wheel motor.

7. A bearing assembly (100) for an in-wheel motor, characterized in that in the 6th paragraph, the rotor (140) has an inner coupling portion (147) at the center; and the radially inner ends of the plurality of bars (148) are coupled to the inner coupling portion (147).

8. In the sixth paragraph, the bearing assembly (100) for an in-wheel motor further includes an inclined portion (146) extending axially inwardly from a radially inner end of the rotor annular portion (144); the plurality of grilles (148) are provided along a circumferential direction on a disc portion provided on the inner side of the rotor annular portion (144), and an inner coupling portion (147) is provided at the center of the disc portion, such that the radially inner end of the grille (148) is coupled to the inner coupling portion (147).

9. In any one of the second, fourth, sixth and seventh clauses, the housing (110) is opened in a concave shape toward the axial outer side and includes a body coupling portion (1111) provided at an outer end and coupled to a fixed wheel, a rotation sensor insertion portion (1131) in which a rotation sensor is inserted at a position facing the encoder rotor (143), and a connector installation portion (1133) in which a connector (130), which is a connection terminal connected to the resolver stator (120), is installed; A bearing assembly (100) for an in-wheel motor, characterized in that the resolver stator (120) is installed on the axial inner side of the housing (110), and the resolver stator (120) faces the resolver rotor (141).

10. In the 9th paragraph, the housing (110) has an installation jaw portion (1119) that protrudes axially outward on the inside and has an installation hole (1118) formed therein, and the resolver rotor (141) is provided on the installation jaw portion (1119) through a connecting member (112) that is fastened to the installation hole (1118), characterized in that the bearing assembly (100) for an in-wheel motor.

11. In the 10th paragraph, the housing (110) includes a housing body (111) made of a metal material that is concave and open outwardly, and a sensor body (113) made of a synthetic resin material that is injection-molded and joined to the housing body (111) as an insert; The above housing body (111) is provided with the body coupling portion (1111), and is provided with a body jaw portion (1113) that is hooked to the end of a fixed wheel on the outer side in the axial direction, and a first housing hole (1115) and a second housing hole (1117) are formed to penetrate in the axial direction on the bottom; The above rotation sensor insertion part (1131) and connector installation part (1133) are provided in the sensor body (113); The above rotation sensor insertion portion (1131) protrudes outward in the axial direction through the first housing hole (1115) and is opened inwardly concavely so that the rotation sensor can be inserted therein, and the connector installation portion (1133) is located on the inside of the second housing hole (1117), and one side of the connection line is connected to the resolver stator (120) through the second housing hole (1117) and the other side is connected to the connector (130) provided in the connector installation portion (1133), characterized in that the bearing assembly (100) for an in-wheel motor.

12. In the 11th paragraph, the sensor body (113) has a body concave portion (1135) that is concave outwardly on the inside of the second housing hole (1117), and the connector installation portion (1133) is provided on the inside of the body concave portion (1135), characterized in that the bearing assembly (100) for an in-wheel motor.

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