Support structure of control board

1. A support structure of a control board comprising:

a control board including a plurality of attaching holes disposed at respective corners of an imaginary polygon;

a support member made of a synthetic resin for supporting the control board;

a plurality of support bosses disposed on the support member in correspondence with the respective attaching holes, the plurality of support bosses each having a support portion in contact with one face of the control board, and an engaging portion inserted into the respective attaching hole and engaged with another face of the control board; and

each of the support bosses being integrally formed with the support member and allowing for expansion and contraction movement of the control board relative to the support member,

wherein each of the engaging portions is formed with a split groove in a shape of a straight line opened at a front end thereof, each split groove is arranged between engaging members, and the respective support bosses are provided at the support member by avoiding alignment between at least two of the split grooves of the support bosses disposed at two ends of straight lines connecting corners of the imaginary polygon, and

wherein the split grooves are arranged so as not to be parallel to each other.

2. A support structure of a control board comprising:

a control board including a plurality of attaching holes disposed at respective corners of an imaginary polygon;

a support member made of a synthetic resin for supporting the control board; and

a plurality of support bosses disposed on the support member in correspondence with the respective attaching holes, the plurality of support bosses each having a support portion in contact with one face of the control board, and an engaging portion inserted into the respective attaching hole and engaged with another face of the control board,

wherein each of the engaging portions is formed with a split groove in a shape of a straight line opened at a front end thereof and the respective support bosses are provided at the support member by avoiding the split grooves of the support bosses disposed at two ends of straight lines connecting corners of the imaginary polygon from being disposed on the same straight lines,

wherein the imaginary polygon is quadrangle, when notations P 1 , P 2 , P 3 and P 4 are attached at positions of the respective corners of the imaginary quadrangle on the control board successively in a peripheral direction,

the support boss at the corner position P 1 is provided on the support member in an attitude by which the split groove is made to be orthogonal to a diagonal line connecting the corner positions P 1 and P 3 ,

the support boss at the corner position P 2 is provided on the support member in an attitude by which the split groove is made to be orthogonal to a diagonal line connecting the corner positions P 2 and P 4 ,

the support boss at the corner position P 3 is provided on the support member in an attitude by which the split groove is made to be along a straight line connecting the corner positions P 2 and P 3 or a straight line connecting the corner positions P 3 and P 4 , and

the support boss at the corner position P 4 is provided on the support member in an attitude by which the split groove is made to be along a straight line connecting the corner positions P 4 and P 1 or a straight line connecting the corner positions P 3 and P 4 .

3. The support structure of a control board as set forth in claim 1 , wherein the imaginary polygon is quadrangle, four of support bosses are provided on the support member in attitudes of avoiding the split grooves of pairs of the support bosses disposed at two ends of straight lines connecting the respective corners of the imaginary quadrangle from being disposed on the same straight lines.

4. The support structure of a control board as set forth in claim 1 , wherein the imaginary polygon is triangle, three of the support bosses are provided on the support member in attitudes of avoiding the split grooves of pairs of the support bosses disposed at two ends of straight lines connecting the corners of the imaginary triangle from being disposed on the same straight lines.

5. The support structure of a control board as set forth in claim 1 , wherein the imaginary polygon is pentagon, five of the support bosses are provided on the support member in attitudes of avoiding the split grooves of pairs of the support bosses disposed at two ends of straight lines connecting respective corners of the imaginary pentagon from being disposed on the same straight lines.

6. A support structure of a control board comprising:

a control board including a plurality of attaching holes disposed at respective corners of an imaginary polygon;

a support member made of a synthetic resin for supporting the control board; and

a plurality of support bosses arranged on the support member in correspondence with the respective attaching holes;

each support boss having a support portion arranged to contact with one face of the control board and an engaging portion inserted into the respective attaching hole and engaged with another face of the control board;

each engaging portion comprising an upper end having a groove arranged between portions that deflect towards each other when the board is connected with the support member; and

the grooves of at least two of the support bosses being arranged on adjacent corners of the imaginary polygon are oriented in a non-parallel manner so as to allow for expansion and contraction movement of the control board relative to the support bosses,

wherein each of the support bosses are integrally formed with the support member and allow for expansion and contraction movement of the control board relative to the support member.

7. The support structure of a control board set forth in claim 6 , wherein the support structure is arranged on a brake hydraulic pressure control apparatus.