1. A hidden type sliding rail structure comprising:
a sliding rail device comprising an upper rail member and a lower rail member, the lower rail member having a sliding space therein;
a sliding device comprising an upper sliding portion and a lower sliding portion respectively embedded to the upper rail member and the lower rail member;
a rolling ball set disposed between the lower rail member and the lower sliding portion, the rolling ball set comprising a first rolling ball disposed to an outer side of the lower rail member, a second rolling ball disposed to an inner side of the lower rail member, and a third rolling ball disposed onto the lower rail member, the first rolling ball, the second rolling ball and the third rolling ball arranged as a equilateral triangle, and a gravitational vertical line of the third rolling ball located between the first rolling ball and the second rolling ball.
2. The hidden type sliding rail structure as recited in claim 1, wherein a connection portion is disposed between the upper sliding portion and the lower sliding portion, and the upper sliding portion, the connection portion and the lower sliding portion are integrally bent and formed.
3. The hidden type sliding rail structure as recited in claim 1, wherein the upper rail member comprises a sliding space therein and an opening under the sliding space, and the upper rail member forms a plurality of curved sliding ways, and the upper sliding portion has a plurality of curved sliding portions corresponding to the plurality of curved sliding ways, and rolling balls are disposed between the curved sliding ways and the curved sliding portions.
4. The hidden type sliding rail structure as recited in claim 1, wherein the lower rail member comprises a tube body that is inwardly bent and a fastening member that is outwardly bent as a bent plate, and the tube body has an upward opening, an inside of the tube body has an inner wall, and the inner wall has an auxiliary bending wall that is protruded and bent toward a side of the sliding space, and the auxiliary bending wall is higher than the third rolling ball.
5. The hidden type sliding rail structure as recited in claim 4, wherein the auxiliary bending wall of the lower rail member comprises a first bending wall and a second bending wall, and the second bending wall forms a curved sliding way corresponding to the third rolling ball, and the lower rail member forms two curved sliding ways thereunder corresponding to the first rolling ball and the second rolling ball respectively.
6. The hidden type sliding rail structure as recited in claim 5, wherein the lower sliding portion has a curved sliding portion corresponding to the curved sliding way of the lower rail member to install the rolling ball set.
7. A hidden type sliding rail structure comprising:
a sliding rail device comprising an upper rail member and a lower rail member, the lower rail member having a sliding space therein, an inside of the lower rail member having an inner wall, the inner wall having an auxiliary bending wall that is protruded and bent toward a side of the sliding space;
a sliding device comprising an upper sliding portion and a lower sliding portion embedded to the upper rail member and the lower rail member respectively;
a rolling ball set disposed between the lower rail member and the lower sliding portion, the rolling ball set comprising a first rolling ball disposed to an outer side of the lower rail member, a second rolling ball disposed to an inner side of the lower rail member, and a third rolling ball disposed onto the lower rail member, the auxiliary bending wall being higher than the third rolling ball.
8. The hidden type sliding rail structure as recited in claim 7, wherein the first rolling ball, the second rolling ball and the third rolling ball are formed as a equilateral triangle, and a gravitational vertical line of the third rolling ball is located between the first rolling ball and the second rolling ball.
9. The hidden type sliding rail structure as recited in claim 7, wherein a connection portion is disposed between the upper sliding portion and the lower sliding portion, and the upper sliding portion, the connection portion and the lower sliding portion are integrally bent and formed.
10. The hidden type sliding rail structure as recited in claim 7, wherein the upper rail member comprising a sliding space therein and an opening under the sliding space, and the upper rail member forms a plurality of curved sliding ways in the sliding space, and the upper sliding portion has a plurality of curved sliding portions corresponding to the plurality of curved sliding ways, and rolling balls are installed between the curved sliding ways and the curved sliding portions.
11. The hidden type sliding rail structure as recited in claim 7, wherein the lower rail member comprises a fastening member that is outwardly bent as a bent plate.
12. The hidden type sliding rail structure as recited in claim 7, wherein the auxiliary bending wall of the lower rail member comprises a first bending wall and a second bending wall, and the second bending wall forms a curved sliding way corresponding to the third rolling ball, and the lower rail member forms two curved sliding ways thereunder corresponding to the first rolling ball and the second rolling ball respectively.
13. The hidden type sliding rail structure as recited in claim 12, wherein the lower sliding portion comprises a curved sliding portion corresponding to the curved sliding way of the lower rail member to install the rolling ball set.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A motor vehicle dashboard crossmember of the type comprising an elongate beam (4) forming at least one segment of the crossmember, the crossmember being characterized in that the beam (4) is formed from an open section member (19, 76, 78, 80, 84) formed by longitudinally bending a metal strip (56) in order to obtain a member of determined section.
2. A crossmember according to claim 1, characterized in that the section member (19, 84) presents a section defining at least two juxtaposed channels (20, 22) extending parallel to each other along the length of the section member (19, 84).
3. A crossmember according to claim 2, characterized in that the channels (22) present sections that are closed.
4. A crossmember according to claim 2, characterized in that at least one channel (20) presents a section that is open, and at least one channel (22) presents a section that is closed.
5. A crossmember according to claim 4, characterized in that the open channel (20) is defined by a channel-section portion of the section member (19) that has a U-shaped section, and the closed channel is defined by a portion of the section member (19) that has an O-shaped section (22).
6. A crossmember according to claim 4, characterized in that the open channel (20) and the closed channel (22) are defined by at least one wall (27) in common.
7. A crossmember according to claim 1, characterized in that the section member (19) presents varying thickness in a cross-section plane.
8. A crossmember according to claim 1, characterized in that, over another segment of the crossmember, it includes an intermediate beam (52) fastened to said beam (4).
9. An assembly comprising a dashboard crossmember according to claim 4, and at least one air duct (42, 48) of a motor vehicle air conditioning system, the or each air duct (42, 48) extending in the open channel (20) that forms a cavity for receiving the or each air duct (42, 48).
10. A method of fabricating a motor vehicle dashboard crossmember beam (4) in which a section member (19, 190) is formed from a metal strip (56) or blank (156) that is folded along a plurality of longitudinal lines (L1 to L5; P1 to P7).
11. A method according to claim 10, in which the section member (19, 190) is closed at least in part so as to obtain a section defining at least one closed channel (22) by using continuous or discontinuous connection means, e.g. of the stapling, foldingcrimping, pinching, or welding types, either during the process of shaping the section member, or subsequently.
12. A method according to claim 10 or claim 11, characterized in that a section member (19) is formed from a metal strip (56) that is moved longitudinally continuously through a roller bending machine (54) so as to bend the metal strip (56) progressively along longitudinal lines (L1 to L5) so as to obtain a section member (19) of determined section, and a segment is taken from the section member (19) in order to form the beam (4).
13. A method according to claim 12, in which the section member (19) is closed by means of a longitudinal weld (40) formed continuously along the section member (19) traveling longitudinally at the outlet from the bending machine (54), prior to cutting off the beam (4).
14. A method according to claim 10, characterized in that the section member (190) is formed from a blank (156) cut to the format of the beam, which blank is allowed to pass through a succession of folding presses (158) so as to fold the blank (156) progressively along fold lines (P1 to P7) in order to obtain a section member (19) of determined section, constituting the beam (4).
15. A method according to claim 10, in which openings (50, 74) distributed along at least one longitudinal line are formed in the strip (56) prior to bending the strip (56) so as to obtain a beam (4) provided with openings distributed along its length.
16. A method according to claim 10, in which the strip (56) or the blank (156) is formed by at least two strips of different thicknesses assembled together along their longitudinal edges, so that the section member (19) presents varying thickness in a section plane.
17. A crossmember according to claim 5, characterized in that the open channel (20) and the closed channel (22) are defined by at least one wall (27) in common.
18. A method according to claim 11, characterized in that a section member (19) is formed from a metal strip (56) that is moved longitudinally continuously through a roller bending machine (54) so as to bend the metal strip (56) progressively along longitudinal lines (L1 to L5) so as to obtain a section member (19) of determined section, and a segment is taken from the section member (19) in order to form the beam (4).
19. A method according to claim 11, characterized in that the section member (190) is formed from a blank (156) cut to the format of the beam, which blank is allowed to pass through a succession of folding presses (158) so as to fold the blank (156) progressively along fold lines (P1 to P7) in order to obtain a section member (19) of determined section, constituting the beam (4).
20. A method according to claim 11, in which openings (50, 74) distributed along at least one longitudinal line are formed in the strip (56) prior to bending the strip (56) so as to obtain a beam (4) provided with openings distributed along its length.