Patent Publication Number: US-2022221481-A1

Title: Wheel sensor device for vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from and the benefit of Korean Patent Application No. 10-2021-0005184, filed on Jan. 14, 2021, which is hereby incorporated by reference for all purposes as if set forth herein. 
     BACKGROUND 
     Field 
     Exemplary embodiments of the present disclosure relate to a wheel sensor device for a vehicle, and more particularly, to a wheel sensor device for a vehicle, of which the stiffness is improved and the sensor function is enhanced. 
     Discussion of the Background 
     In general, a wheel sensor device for a vehicle serves to sense the wheel speed of the corresponding wheel among four wheels of the vehicle, and input the sensed wheel speed to an electronic control unit, and is mounted on a knuckle or the like. At this time, the sensor device for a vehicle includes one sensor having an IC (Integrated Circuit). Thus, when a plurality of sensors is needed, a plurality of sensor devices for a vehicle needs to be mounted on a counterpart such as a knuckle. Therefore, a plurality of holes for mounting the plurality of sensor devices need to be formed in the counterpart. As a result, the stiffness of the counterpart may be degraded. Therefore, there is a need for a device capable of solving the problem. 
     The related art of the present disclosure is disclosed in Korean Patent Application Laid-Open No. 10-2016-0027316 published on Mar. 10, 2016 and entitled “Structure of Mounting Wheel Sensor for Automobile”. 
     SUMMARY 
     Various embodiments are directed to a wheel sensor device for a vehicle, of which the stiffness is improved and the sensor function is enhanced. 
     In an embodiment, a wheel sensor device for a vehicle may include: a first sensor part having a first fixing hole, inserted into an insertion part of a knuckle of a vehicle, and configured to sense wheel speed of the vehicle; a second sensor part overlapping the first sensor part, inserted into the insertion part with the first sensor part, having a second fixing hole facing the first fixing hole, and configured to sense the wheel speed; and a fixing member fixed to a mounting part of the knuckle through the first and second fixing holes. 
     The first sensor part may include: a first flange part having the first fixing hole formed therein; and a first sensor head connected to the first flange part, and configured to sense the wheel speed. 
     The second sensor part may include: a second flange part having the second fixing hole formed therein, and overlapping the first flange part; and a second sensor head connected to the second flange part, neighboring on the first sensor head, and configured to sense the wheel speed. 
     The first sensor part may have a first coupling part formed on one side thereof, and the second sensor part may have a second coupling part formed on one side thereof and coupled to the first coupling part. 
     The second coupling part may be formed in a recess shape in the second sensor head, and the first coupling part may be formed in a hook shape protruding from the first sensor head to one side, and hooked and coupled to the second coupling part. 
     In an embodiment, a wheel sensor device for a vehicle may include: a first sensor part having a first fixing hole, inserted into an insertion part of a knuckle of a vehicle, and configured to sense wheel speed of the vehicle; a second sensor part overlapping the first sensor part, inserted into the insertion part with the first sensor part, having a second fixing hole facing the first fixing hole, and configured to sense the wheel speed; a third sensor part overlapping the first sensor part, inserted into the insertion part with the first and second sensor parts, having a third fixing hole facing the first and second fixing holes, and configured to sense the wheel speed; and a fixing member fixed to a mounting part of the knuckle through the first to third fixing holes. 
     The first sensor part may include: a first flange part having the first fixing hole formed therein; and a first sensor head connected to the first flange part, and configured to sense the wheel speed. 
     The second sensor part may include: a second flange part having the second fixing hole formed therein; and a second sensor head connected to the second flange part, located on one side of the first sensor head so as to neighbor on the first sensor head, and configured to sense the wheel speed. 
     The third sensor part may include: a third flange part having the third fixing hole formed therein; and a third sensor head connected to the third flange part, located on the other side of the first sensor head so as to neighbor on the first sensor head, and configured to sense the wheel speed. 
     The first sensor part may have a first-first coupling part formed on one side thereof and a first-second coupling part formed on the other side thereof, the second sensor part may have a second coupling part formed on one side thereof and coupled to the first-first coupling part, and the third sensor part may have a third coupling part formed on one side thereof and coupled to the first-second coupling part. 
     The first-first coupling part may be formed in a recess shape in the first sensor head, the second coupling part may be formed in a hook shape protruding from the second sensor head to one side, and hooked and coupled to the first-first coupling part, the third coupling part may be formed in a recess shape in the third sensor head, and the first-second coupling part may be formed in a hook shape protruding from the first sensor head to one side, and hooked and coupled to the third coupling part. 
     In an embodiment, a wheel sensor device for a vehicle may include: a first sensor part having a first fixing hole, inserted into an insertion part of a knuckle of a vehicle, and configured to sense wheel speed of the vehicle; a second sensor part overlapping the first sensor part, inserted into the insertion part with the first sensor part, having a second fixing hole facing the first fixing hole, and configured to sense the wheel speed; a third sensor part overlapping the first sensor part, inserted into the insertion part with the first and second sensor parts, having a third fixing hole facing the first and second fixing holes, and configured to sense the wheel speed; a fourth sensor part overlapping the second sensor part, inserted into the insertion part with the first to third sensor parts, having a fourth fixing hole facing the first to third fixing holes, and configured to sense the wheel speed; and a fixing member fixed to a mounting part of the knuckle through the first to fourth fixing holes. 
     The first sensor part may include: a first flange part having the first fixing hole formed therein; and a first sensor head connected to the first flange part, and configured to sense the wheel speed. 
     The second sensor part may include: a second flange part having the second fixing hole formed therein; and a second sensor head connected to the second flange part, located on one side of the first sensor head so as to neighbor on the first sensor head, and configured to sense the wheel speed. 
     The third sensor part may include: a third flange part having the third fixing hole formed therein; and a third sensor head connected to the third flange part, located on the other side of the first sensor head so as to neighbor on the first sensor head, and configured to sense the wheel speed. 
     The fourth sensor part may include: a fourth flange part having the fourth fixing hole formed therein; and a fourth sensor head connected to the fourth flange part, located on one side of the second sensor head so as to neighbor on the second sensor head, and configured to sense the wheel speed. 
     The first sensor part may have a first-first coupling part formed on one side thereof and a first-second coupling part formed on the other side thereof, the second sensor part may have a second-first coupling part formed on one side thereof and coupled to the first-first coupling part, and a second-second coupling part formed on the other side thereof, the third sensor part may have a third coupling part formed on one side thereof and coupled to the first-second coupling part, and the fourth sensor part may have a fourth coupling part formed on one side thereof and coupled to the second-second coupling part. 
     The first-first coupling part may be formed in a recess shape in the first sensor head, the third coupling part may be formed in a hook shape protruding from the third sensor head to one side, and hooked and coupled to the first-first coupling part, the second-first coupling part may be formed in a recess shape in the second sensor head, the first-second coupling part may be formed in a hook shape protruding from the first sensor head to one side, and hooked and coupled to the second-first coupling part, the fourth coupling part may be formed in a recess shape in the fourth sensor head, and the second-second coupling part is formed in a hook shape protruding from the second sensor head to one side, and hooked and coupled to the fourth coupling part. 
     In accordance with the embodiments of the present disclosure, the wheel sensor devices may each include the plurality of sensors. Thus, when a plurality of wheel sensor devices is installed on the knuckle, each of the wheel sensor devices does not need to be installed on a knuckle. Therefore, the degradation in stiffness of the knuckle may be prevented, which makes it possible to improve the stiffness of the knuckle. Furthermore, the sensor function may be enhanced to increase the safety performance of the vehicle system which requires autonomous driving and redundancy functions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a wheel sensor device for a vehicle in accordance with a first embodiment of the present disclosure. 
         FIG. 2  is a perspective view of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure, when seen from a different direction. 
         FIG. 3  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure. 
         FIGS. 4A and 4B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure. 
         FIGS. 5A and 5B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure to a knuckle. 
         FIG. 6  is a perspective view of a wheel sensor device for a vehicle in accordance with a second embodiment of the present disclosure. 
         FIG. 7  is a perspective view of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure, when seen from a different direction. 
         FIG. 8  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure. 
         FIGS. 9A and 9B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure. 
         FIGS. 10A and 10B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure to a knuckle. 
         FIG. 11  is a perspective view of a wheel sensor device for a vehicle in accordance with a third embodiment of the present disclosure. 
         FIG. 12  is a perspective view of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure, when seen from a different direction. 
         FIG. 13  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure. 
         FIGS. 14A and 14B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure. 
         FIGS. 15A and 15B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure to a knuckle. 
     
    
    
     DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS 
     Hereinafter, a wheel sensor device for a vehicle will be described below with reference to the accompanying drawings through various exemplary embodiments. 
     It should be noted that the drawings are not to precise scale and may be exaggerated in thickness of lines or sizes of components for descriptive convenience and clarity only. Furthermore, the terms as used herein are defined by taking functions of the invention into account and can be changed according to the custom or intention of users or operators. Therefore, definition of the terms should be made according to the overall disclosures set forth herein. 
       FIG. 1  is a perspective view of a wheel sensor device for a vehicle in accordance with a first embodiment of the present disclosure,  FIG. 2  is a perspective view of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure, when seen from a different direction,  FIG. 3  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure,  FIGS. 4A and 4B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure, and  FIGS. 5A and 5B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the first embodiment of the present disclosure to a knuckle. 
     Referring to  FIGS. 1 to 5 , a wheel sensor device  1  in accordance with the first embodiment of the present disclosure includes a first sensor part  100 , a second sensor part  200  and a fixing member  20 . The first sensor part  100  has a first fixing hole  111   a , is inserted into and has a portion partially occupying an insertion part  12  of a knuckle  10  of the vehicle, and serves to sense the wheel speed of the vehicle. The insertion part  12  may include an insertion space. 
     The second sensor part  200  overlaps the first sensor part  100 , is inserted into and has a portion partially occupying the insertion part  12  with the first sensor part  100 , and has a second fixing hole  211   a  facing or aligned with the first fixing hole  111   a . Specifically, the first and second sensor parts  100  and  200  are connected to overlap each other. At this time, the first fixing hole  111   a  of the first sensor part  100  and the second fixing hole  211   a  of the second sensor part  200  are located on the same line. 
     The fixing member  20  is fixed to a mounting structure  11  of the knuckle  10  through the first and second fixing holes  111   a  and  211   a . For example, the fixing member  20  such as a bolt may be screwed to the mounting structure  11 . 
     After the first and second sensor parts  100  and  200  are coupled to each other, the first and second sensor parts  100  and  200  are partially inserted into the insertion part  12  formed in the knuckle  10 . That is, as a first sensor head  120  of the first sensor part  100  and a second sensor head  220  of the second sensor part  200  are inserted into the insertion part  12 , the first fixing hole  111   a  of the first sensor part  100  and the second fixing hole  211   a  of the second sensor part  200  are disposed to face the fixing member  20  in the knuckle  10 . 
     Then, as the fixing member  20  is coupled to the mounting structure  11  of the knuckle  10  through the first fixing hole  111   a  of the first sensor part  100  and the second fixing hole  211   a  of the second sensor part  200 , the wheel sensor device  1 , i.e., the first and second sensor parts  100  and  200  may be fixed to the knuckle  10 . 
     The first sensor part  100  includes a first flange part  110  and the first sensor head  120 . The first flange part  110  has the first fixing hole  111   a  formed therein. The first flange part  110  includes a first flange body  111  and a first flange extension  112 . The first flange body  111  has a plate shape, and the first fixing hole  111   a  is formed in the center of the first flange body  111 . The first flange extension  112  is extended from the first flange body  111  to one side, and the first sensor head  120  which will be described below is coupled to and integrated with the first flange extension  112 . At this time, the first flange extension  112  is extended to the bottom (based on  FIG. 4 ) from a position deviating from the same line as the center of the first flange body  111 . 
     The first sensor head  120  is connected to the first flange part  110  and serves to sense wheel speed. The first sensor head  120  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to a control unit (not illustrated). 
     The second sensor part  200  includes a second flange part  210  and the second sensor head  220 . The second flange part  210  has the second fixing hole  211   a  formed therein, and overlaps the first flange part  110 . The second flange part  210  includes a second flange body  211  and a second flange extension  212 . The second flange body  211  is formed in a plate shape, has the second fixing hole  211   a  formed in the center thereof, and overlaps the first flange body  111 . At this time, when the second fixing hole  211   a  is disposed to overlap the first fixing hole  111   a  of the first flange body  111 , the center O′ of the second fixing hole  211   a  is located on the same line as the center O of the first fixing hole  111   a.    
     The second flange extension  212  is extended from the second flange body  211  to one side, and the second sensor head  220  which will be described below is coupled to and integrated with the second flange extension  212 . At this time, the second flange extension  212  is extended to the bottom (based on  FIG. 4 ) from a position deviating from the same line as the center of the second flange body  211 , and neighbors on the first flange extension  112 . Thus, the second sensor head  220  and the first sensor head  120  may neighbor on each other. 
     The second sensor head  220  is connected to the second flange part  210 , neighbors on the first sensor head  120 , and serves to sense wheel speed. The second sensor head  220  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The first sensor part  100  has a first coupling part  130  formed on one side thereof, and the second sensor part  200  has a second coupling part  230  formed on one side thereof and coupled to the first coupling part  130 . The second coupling part  230  is formed in a recess shape in the second sensor head  220 , and the first coupling part  130  is formed in a hook shape protruding from the first sensor head  120  to one side, and hooked and coupled to the second coupling part  230 . 
     In the present embodiment, it has been described that the second coupling part  230  is formed in a recess shape, and the first coupling part  130  is formed in a hook shape. However, the present embodiment is not limited thereto, but may be designed in various shapes, as long as the first and second coupling parts  130  and  230  are coupled to each other. For example, the first coupling part  130  may be formed in a recess shape, and the second coupling part  230  may be formed in a hook shape, in different situations. 
     The first and second sensor parts  100  and  200  may be provisionally assembled through the first and second coupling parts  130  and  230  and then fixed to the knuckle  10 . Thus, the first and second sensor parts  100  and  200  may be more easily fixed to the knuckle  10 . 
       FIG. 6  is a perspective view of a wheel sensor device for a vehicle in accordance with a second embodiment of the present disclosure,  FIG. 7  is a perspective view of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure, when seen from a different direction,  FIG. 8  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure,  FIGS. 9A and 9B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure, and  FIGS. 10A and 10B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the second embodiment of the present disclosure to a knuckle. 
     Hereafter, a wheel sensor device  2  for a vehicle in accordance with the second embodiment of the present disclosure will be described. At this time, the detailed descriptions of the same contents of the second embodiment as those of the first embodiment will be omitted herein. 
     Referring to  FIGS. 6 to 10 , the wheel sensor device  2  in accordance with the second embodiment of the present disclosure includes a first sensor part  100 , a second sensor part  200 , a third sensor part  300 , and a fixing member  20 . The first sensor part  100  has a first fixing hole  111   a , is inserted into and has a portion partially occupying an insertion part  12  of a knuckle  10  of the vehicle, and serves to sense the wheel speed of the vehicle. 
     The second sensor part  200  overlaps the first sensor part  100 , is inserted into and has a portion partially occupying the insertion part  12  with the first sensor part  100 , has a second fixing hole  211   a  facing or aligned with the first fixing hole  111   a , and serves to sense wheel speed. 
     The third sensor part  300  overlaps the first sensor part  100 , is inserted into and has a portion partially occupying the insertion part  12  with the first and second sensor parts  100  and  200 , has a third fixing hole  311   a  facing or aligned with the first and second fixing holes  111   a  and  211   a , and serves to sense wheel speed. 
     The fixing member  20  is fixed to a mounting structure  11  of the knuckle  10  through the first to third fixing holes  111   a ,  211   a , and  311   a . For example, the fixing member  20  such as a bolt may be screwed to the mounting structure  11 . 
     Specifically, the first to third sensor parts  100 ,  200 , and  300  are connected to overlap one another. At this time, the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , and the third fixing hole  311   a  of the third sensor part  300  are located on the same line. 
     After the first to third sensor parts  100 ,  200 , and  300  are coupled to one another, the first to third sensor parts  100 ,  200 , and  300  are partially inserted into the insertion part  12  formed in the knuckle  10 . That is, as a first sensor head  120  of the first sensor part  100 , a second sensor head  220  of the second sensor part  200 , and a third sensor head  320  of the third sensor part  300  are inserted into the insertion part  12 , the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , and the third fixing hole  311   a  of the third sensor part  300  are disposed to face the fixing member  20  in the knuckle  10 . 
     Then, as the fixing member  20  is coupled to the mounting structure  11  of the knuckle  10  through the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , and the third fixing hole  311   a  of the third sensor part  300 , the wheel sensor device  2 , i.e. the first to third sensor parts  100 ,  200 , and  300  may be fixed to the knuckle  10 . 
     The first sensor part  100  includes a first flange part  110  and the first sensor head  120 . The first flange part  110  has the first fixing hole  111   a  formed therein. The first flange part  110  includes a first flange body  111  and a first flange extension  112 . The first flange body  111  has a plate shape, and the first fixing hole  111   a  is formed in the center of the first flange body  111 . The first flange extension  112  is extended from the first flange body  111  to one side, and the first sensor head  120  which will be described below is coupled to and integrated with the first flange extension  112 . At this time, the first flange extension  112  is extended to the bottom (based on  FIG. 9 ) from a position on the same line as the center of the first flange body  111 . 
     The first sensor head  120  is connected to the first flange part  110  and serves to sense wheel speed. The first sensor head  120  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to a control unit (not illustrated). 
     The second sensor part  200  includes a second flange part  210  and the second sensor head  220 . The second flange part  210  has the second fixing hole  211   a  formed therein, and overlaps the first flange part  110 . The second flange part  210  includes a second flange body  211  and a second flange extension  212 . The second flange body  211  is formed in a plate shape, has the second fixing hole  211   a  formed therein, and overlaps the first flange body  111 . At this time, when the second fixing hole  211   a  overlaps the first fixing hole  111   a  of the first flange body  111 , the center O′ of the second fixing hole  211   a  is located on the same line as the center O of the first fixing hole  111   a.    
     The second flange extension  212  is extended from the second flange body  211  to one side, and the second sensor head  220  which will be described below is coupled to and integrated with the second flange extension  212 . At this time, the second flange extension  212  is extended to the bottom (based on  FIG. 9 ) from a position deviating from the same line as the center of the second flange body  211 , and neighbors on the first flange extension  112 . Thus, the second sensor head  220  may neighbor on the first sensor head  120 . 
     The second sensor head  220  is connected to the second flange part  210 , neighbors on the first sensor head  120 , and serves to sense wheel speed. The second sensor head  220  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The third sensor part  300  includes a third flange part  310  and the third sensor head  320 . The third flange part  310  has the third fixing hole  311   a  formed therein, and overlaps the second flange part  210 . The third flange part  310  includes a third flange body  311  and a third flange extension  312 . The third flange body  311  is formed in a plate shape, has the third fixing hole  311   a  formed therein, and overlaps the second flange body  211 . At this time, when the third fixing hole  311   a  overlaps the first fixing hole  111   a  of the first flange body  111  and the second fixing hole  211   a  of the second flange body  211 , the center O″ of the third fixing hole  311   a  is located on the same line as the center O of the first fixing hole  111   a  and the center O′ of the second fixing hole  211   a.    
     The third flange extension  312  is extended from the third flange body  311  to one side, and the third sensor head  320  which will be described below is coupled to the third flange extension  312 . At this time, the third flange extension  312  is extended to the bottom (based on  FIG. 9 ) from a position deviating from the same line as the center of the third flange body  311 , and neighbors on the first flange extension  112 . Thus, the third sensor head  320  may be located in parallel to the first sensor head  120  and the second sensor head  220 . 
     The third sensor head  320  is connected to the third flange part  310 , located on the other side of the first sensor head  120  so as to neighbor on the first sensor head  120 , and serves to sense wheel speed. The third sensor head  320  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The first sensor part  100  includes a first-first coupling part  140  formed on one side thereof and a first-second coupling part  150  formed on the other side thereof, the second sensor part  200  includes a second coupling part  230  formed on one side thereof and coupled to the first-first coupling part  140 , and the third sensor part  300  includes a third coupling part  330  formed on one side thereof and coupled to the first-second coupling part  150 . 
     The first-first coupling part  140  is formed in a recess shape in the first sensor head  120 , and the second coupling part  230  is formed in a hook shape protruding from the second sensor head  220  to one side, and hooked and coupled to the first-first coupling part  140 . 
     The third coupling part  330  is formed in a recess shape in the third sensor head  320 , and the first-second coupling part  150  is formed in a hook shape protruding from the first sensor head  120  to one side, and hooked and coupled to the third coupling part  330 . 
     In the present embodiment, it has been described that the first-first coupling part  140  and the third coupling part  330  are formed in a recess shape, and the second coupling part  230  and the first-second coupling part  150  are formed in a hook shape. However, the present embodiment is not limited thereto, but may be designed in various shapes as long as the first-first coupling part  140 , the first-second coupling part  150 , the second coupling part  230 , and the third coupling part  330  are coupled to one another. For example, the second coupling part  230  and the first-second coupling part  150  may be formed in a recess shape, and the first-first coupling part  140  and the third coupling part  330  may be formed in a hook shape, in different situations. 
     The first sensor part  100 , the second sensor part  200 , and the third sensor part  300  may be provisionally assembled through the first-first coupling part  140 , the first-second coupling part  150 , the second coupling part  230  and the third coupling part  330 , and then fixed to the knuckle  10 . Thus, the first sensor part  100 , the second sensor part  200 , and the third sensor part  300  may be more easily fixed to the knuckle  10 . 
       FIG. 11  is a perspective view of a wheel sensor device for a vehicle in accordance with a third embodiment of the present disclosure,  FIG. 12  is a perspective view of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure, when seen from a different direction,  FIG. 13  is an exploded perspective view of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure,  FIGS. 14A and 14B  are diagrams illustrating a coupling process of the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure, and  FIGS. 15A and 15B  are diagrams illustrating a process of assembling the wheel sensor device for a vehicle in accordance with the third embodiment of the present disclosure to a knuckle 
     Hereafter, a wheel sensor device  3  for a vehicle in accordance with the third embodiment of the present disclosure will be described. At this time, the detailed descriptions of the same contents of the third embodiment as those of the first and second embodiments will be omitted herein. 
     Referring to  FIGS. 11 to 15 , the wheel sensor device  3  in accordance with the third embodiment of the present disclosure includes a first sensor part  100 , a second sensor part  200 , a third sensor part  300 , a fourth sensor part  400 , and a fixing member  20 . The first sensor part  100  has a first fixing hole  111   a , is inserted into and has a portion partially occupying an insertion part  12  of a knuckle  10  of the vehicle, and serves to sense the wheel speed of the vehicle. 
     The second sensor part  200  overlaps the first sensor part  100 , is inserted into and has a portion partially occupying the insertion part  12  with the first sensor part  100 , has a second fixing hole  211   a  facing or aligned with the first fixing hole  111   a , and serves to sense wheel speed. 
     The third sensor part  300  overlaps the first sensor part  100 , is inserted into and has a portion partially occupying the insertion part  12  with the first and second sensor parts  100  and  200 , has a third fixing hole  311   a  facing or aligned with the first and second fixing holes  111   a  and  211   a , and serves to sense wheel speed. 
     The fourth sensor part  400  overlaps the second sensor part  200 , is inserted into and has a portion partially occupying the insertion part  12  with the first to third sensor parts  100 ,  200  and  300 , has a fourth fixing hole  411   a  facing or aligned with the first to third fixing holes  111   a ,  211   a  and  311   a , and serves to sense wheel speed. 
     The fixing member  20  is fixed to a mounting structure  11  of the knuckle  10  through the first to fourth fixing holes  111   a ,  211   a ,  311   a  and  411   a . For example, the fixing member  20  such as a bolt may be screwed to the mounting structure  11 . 
     Specifically, the first to fourth sensor parts  100 ,  200 ,  300 , and  400  are connected to overlap one another. At this time, the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , the third fixing hole  311   a  of the third sensor part  300 , and the fourth fixing hole  411   a  of the fourth sensor part  400  are located on the same line. 
     After the first sensor part  100 , the second sensor part  200 , the third sensor part  300 , and the fourth sensor part  400  are coupled to one another, the first to fourth sensor parts  100 ,  200 ,  300 , and  400  are partially inserted into the insertion part  12  formed in the knuckle  10 . That is, as a first sensor head  120  of the first sensor part  100 , a second sensor head  220  of the second sensor part  200 , and a third sensor head  320  of the third sensor part  300 , and a fourth sensor head  420  of the fourth sensor part  400  are inserted into the insertion part  12 , the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , the third fixing hole  311   a  of the third sensor part  300 , and the fourth fixing hole  411   a  of the fourth sensor part  400  are disposed to face the fixing member  20  in the knuckle  10 . 
     Then, as the fixing member  20  is coupled to the mounting structure  11  of the knuckle  10  through the first fixing hole  111   a  of the first sensor part  100 , the second fixing hole  211   a  of the second sensor part  200 , the third fixing hole  311   a  of the third sensor part  300 , and the fourth fixing hole  411   a  of the fourth sensor part  400 , the wheel sensor device  3 , i.e. the first to fourth sensor parts  100 ,  200 ,  300 , and  400  may be fixed to the knuckle  10 . 
     The first sensor part  100  includes a first flange part  110  and the first sensor head  120 . The first flange part  110  has the first fixing hole  111   a  formed therein. The first flange part  110  includes a first flange body  111  and a first flange extension  112 . The first flange body  111  has a plate shape, and the first fixing hole  111   a  is formed in the center of the first flange body  111 . The first flange extension  112  is extended from the first flange body  111  to one side, and the first sensor head  120  which will be described below is coupled to and integrated with the first flange extension  112 . At this time, the first flange extension  112  is extended to the bottom (based on  FIG. 14 ) from a position deviating from the same line as the center of the first flange body  111 . 
     The first sensor head  120  is connected to the first flange part  110  and serves to sense wheel speed. The first sensor head  120  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to a control unit (not illustrated). 
     The second sensor part  200  includes a second flange part  210  and the second sensor head  220 . The second flange part  210  has the second fixing hole  211   a  formed therein, and overlaps the first flange part  110 . The second flange part  210  includes a second flange body  211  and a second flange extension  212 . The second flange body  211  is formed in a plate shape, has the second fixing hole  211   a  formed therein, and overlaps the first flange body  111 . At this time, when the second fixing hole  211   a  overlaps the first fixing hole  111   a  of the first flange body  111 , the center O′ of the second fixing hole  211   a  is located on the same line as the center O of the first fixing hole  111   a.    
     The second flange extension  212  is extended from the second flange body  211  to one side, and the second sensor head  220  which will be described below is coupled to and integrated with the second flange extension  212 . At this time, the second flange extension  212  is extended to the bottom (based on  FIG. 14 ) from a position deviating from the same line as the center of the second flange body  211 , and neighbors on the first flange extension  112 . Thus, the second sensor head  220  may neighbor on the first sensor head  120 . 
     The second sensor head  220  is connected to the second flange part  210 , neighbors on the first sensor head  120 , and serves to sense wheel speed. The second sensor head  220  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The third sensor part  300  includes a third flange part  310  and the third sensor head  320 . The third flange part  310  has the third fixing hole  311   a  formed therein, and overlaps the second flange part  210 . The third flange part  310  includes a third flange body  311  and a third flange extension  312 . The third flange body  311  is formed in a plate shape, has the third fixing hole  311   a  formed therein, and overlaps the second flange body  211 . At this time, when the third fixing hole  311   a  overlaps the first fixing hole  111   a  of the first flange body  111  and the second fixing hole  211   a  of the second flange body  211 , the center O″ of the third fixing hole  311   a  is located on the same line as the center O of the first fixing hole  111   a  and the center O′ of the second fixing hole  211   a.    
     The third flange extension  312  is extended from the third flange body  311  to one side, and the third sensor head  320  which will be described below is coupled to the third flange extension  312 . At this time, the third flange extension  312  is extended to the bottom (based on  FIG. 14 ) from a position deviating from the same line as the center of the third flange body  311 , and neighbors on the first flange extension  112 . Thus, the third sensor head  320  may be located in parallel to the first sensor head  120  and the second sensor head  220 . 
     The third sensor head  320  is connected to the third flange part  310 , located on the other side of the first sensor head  120  so as to neighbor on the first sensor head  120 , and serves to sense wheel speed. The third sensor head  320  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The fourth sensor part  400  includes a fourth flange part  410  and a fourth sensor head  420 . The fourth flange part  410  has the fourth fixing hole  411   a  formed therein, and overlaps the second flange part  210 . The fourth flange part  410  includes a fourth flange body  411  and a fourth flange extension  412 . The fourth flange body  411  is formed in a plate shape, has the fourth fixing hole  411   a  formed therein, and overlaps the second flange body  211 . At this time, when the fourth fixing hole  411   a  overlaps the first fixing hole  111   a  of the first flange body  111  and the second fixing hole  211   a  of the second flange body  211 , the center O′ of the fourth fixing hole  411   a  is located on the same line as the center O of the first fixing hole  111   a , the center O′ of the second fixing hole  211   a  and the center O″ of the third fixing hole  311   a.    
     The fourth flange extension  412  is extended from the fourth flange body  411  to one side, and the fourth sensor head  420  which will be described below is coupled to and integrated with the fourth flange extension  412 . At this time, the fourth flange extension  412  is extended to the bottom (based on  FIG. 14 ) from a position deviating from the same line as the center of the fourth flange body  411 , and neighbors on the first flange extension  112 . Thus, the fourth sensor head  420  may be located in parallel to the first sensor head  120 , the second sensor head  220 , and the third sensor head  320 . 
     The fourth sensor head  420  is connected to the fourth flange part  410 , located on the other side of the first sensor head  120  so as to neighbor on the first sensor head  120 , and serves to sense wheel speed. The fourth sensor head  420  includes an IC (not illustrated), and senses wheel speed and transfers the sensed wheel speed to the control unit (not illustrated). 
     The first sensor part  100  includes a first-first coupling part  140  formed on one side thereof and a first-second coupling part  150  formed on the other side thereof, the second sensor part  200  includes a second-first coupling part  240  formed on one side thereof and coupled to the first-first coupling part  140  and a second-second coupling part  250  formed on the other side thereof, the third sensor part  300  includes a third coupling part  330  formed on one side thereof and coupled to the first-second coupling part  150 , and the fourth sensor part  400  includes a fourth coupling part  430  formed on one side thereof and coupled to the second-second coupling part  250 . 
     The first-first coupling part  140  is formed in a recess shape in the first sensor head  120 , the third coupling part  330  is formed in a hook shape protruding from the third sensor head  320  to one side, and hooked and coupled to the first-first coupling part  140 . The second-first coupling part  240  is formed in a recess shape in the second sensor head  220 , and the first-second coupling part  150  is formed in a hook shape protruding from the first sensor head  120  to one side, and hooked and coupled to the second-first coupling part  240 . The fourth coupling part  430  is formed in a recess shape in the fourth sensor head  420 , and the second-second coupling part  250  is formed in a hook shape protruding from the second sensor head  220  to one side, and hooked and coupled to the fourth coupling part  430 . 
     In the present embodiment, the first-first coupling part  140 , the second-first coupling part  240 , and the fourth coupling part  430  are formed in a recess shape, and the first-second coupling part  150 , the second-second coupling part  250 , and the third coupling part  330  are formed in a hook shape. However, the present embodiment is not limited thereto, but may be designed in various shapes as long as the first-first coupling part  140 , the first-second coupling part  150 , the second-first coupling part  240 , the second-second coupling part  250 , the third coupling part  330 , and the fourth coupling part  430  are coupled to one another. For example, the first-second coupling part  150 , the second-second coupling part  250 , and the third coupling part  330  may be formed in a recess shape, and the first-first coupling part  140 , the second-first coupling part  240 , and the fourth coupling part  430  may be formed in a hook shape, in different situations. 
     The first sensor part  100 , the second sensor part  200 , the third sensor part  300 , and the fourth sensor part  400  may be provisionally assembled through the first-first coupling part  140 , the first-second coupling part  150 , the second-first coupling part  240 , the second-second coupling part  250 , the third coupling part  330 , and the fourth coupling part  430 , and then fixed to the knuckle  10 . Thus, the first sensor part  100 , the second sensor part  200 , the third sensor part  300 , and the fourth sensor part  400  may be more easily fixed to the knuckle  10 . 
     Furthermore, it has been described that the wheel sensor devices  1  to  3  in accordance with the present embodiments include two to four sensors, respectively. However, the present disclosure is not limited thereto, but the wheel sensor device may include five or more sensors in different situation. 
     Furthermore, it has been described that the wheel sensor devices  1  to  3  in accordance with the present embodiments each include the plurality of sensors which neighbor on each other in a horizontal direction, i.e., a side-to-side direction (based on  FIGS. 1 to 15 ). However, the present disclosure is not limited thereto, but the wheel sensor devices may be modified in various manners as long as a plurality of sensors are connected to constitute one sensor module. For example, a plurality of sensors may be stacked in a vertical direction, i.e., a top-to-bottom direction (based on  FIGS. 1 to 15 ) in different situations. The sensors indicate the first sensor part  100 , the second sensor part  200 , the third sensor part  300 , and the fourth sensor part  400  in accordance with the present disclosure. 
     As such, the wheel sensor devices  1  to  3  in accordance with the present disclosure may each include the plurality of sensors. Thus, when a plurality of wheel sensor devices is installed on the knuckle, each of the wheel sensor devices does not need to be installed on the knuckle  10 . Therefore, the degradation in stiffness of the knuckle  10  may be prevented, which makes it possible to improve the stiffness of the knuckle  10 . Furthermore, the sensor function may be enhanced to increase the safety performance of the vehicle system which requires autonomous driving and redundancy functions. 
     Although exemplary embodiments of the disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as defined in the accompanying claims. Thus, the true technical scope of the disclosure should be defined by the following claims.