1. An electronic circuit unit, comprising:
a circuit board having an upper face on which electronic components are mounted to form a desired electric circuit and a lower face having a plurality of first land portions connected to the electric circuit; and
a connector member disposed at a lower portion of the circuit board;
wherein the connector member has an insulating resin portion, a metallic shield plate embedded in the insulating resin portion, and connector terminals which are provided with first terminals protruding from an upper face of the insulating resin portion and second terminals protruding from a lower face of the insulating resin portion; and
wherein the connector terminals are configured such that the first terminals over the upper face are electrically connected to the first land portions and the second terminals over the lower face are electrically connectable to second land portions of a mother substrate.
2. The electronic circuit unit according to claim 1,
wherein the shield plate has a plurality of cutout portions, and the connector terminals are arranged to pass through the cutout portions vertically without contacting the shield plate.
3. The electronic circuit unit according to claim 1,
wherein the connector member has earth terminals which are electrically connected to the shield plate, and the earth terminals are electrically connectable to the second land portions of the mother substrate.
4. The electronic circuit unit according to claim 1,
wherein the connector terminals are made of metallic plates, and are formed by the second terminals deformably extending from an outer surface of the insulating resin portion.
5. The electronic circuit unit according to claim 1,
wherein the first land portions and the first terminals are soldered.
6. The electronic circuit unit according to claim 1,
wherein the circuit board includes connecting pieces soldered to the first land portions; the connecting pieces are made of metallic thin plates;
the connecting pieces have first connections soldered to the first land portions, second connections soldered to the first terminals, and legs linking the first and second connections; and the first land portions and the first terminals are soldered by the legs while separated.
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 piston (20) for an internal combustion engine comprising:
a piston body (22) extending along a longitudinal axis (L) having a pair of pin bosses (36) with pin bores (38) aligned along a pin bore axis (P) that is transverse to said longitudinal axis (L), and a piston skirt (30) having an outer surface (42) with a convex profile in the circumferential direction of said piston skirt (30);
said outer surface (42) of said piston skirt (30) including at least one oil reservoir (44) disposed above said pin bore axis (P) and at least one oil recess (46) disposed below said pin bore axis (P) and spaced longitudinally from said at least one oil reservoir (44) by an intervening oil spreading area (48) of said piston skirt (30); and
wherein said at least one oil reservoir (44) and said at least one oil recess (46) have radiused corners (54) or edges at a transition between said outer surface (42) of said piston skirt (30) and at a bottom (50) of said at least one oil reservoir (44) and said at least one oil recess (46), such that said at least one oil reservoir (44) and said at least one oil recess (46) are free of sharp edges or corners.
2. The piston (20) of claim 1, wherein said at least one oil reservoir (44) and said at least one oil recess (46) have ramped side walls (52) that transition to said outer surface (42) of said piston skirt (30) and said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) by said radiused corners (54).
3. The piston (20) of claim 2, wherein said ramped side walls (52) have a ramp depth (dr) decreasing from said bottoms (50) to said outer surface (42).
4. The piston (20) of claim 1, wherein said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) each have a bottom depth (db) between about 10 microns and about 50 microns.
5. The piston (20) of claim 1, wherein said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) each have a bottom depth (db), and said bottom depth (db) of said at least one oil reservoir (44) is greater than said bottom depth (db) of said at least one oil recess (46).
6. The piston (20) of claim 1, wherein said at least one oil reservoir (44) and said at least one oil recess (46) are approximately equal in area.
7. The piston (20) of claim 1, wherein said outer surface (42) has a predetermined surface area (A), and said at least one oil reservoir (44) and said at least one oil recess (46) together extend over approximately one third of said predetermined surface area (A).
8. The piston (20) of claim 1, wherein said each of said oil recesses (46) have a recess length (l1) and a recess width (w1), and each of said oil reservoirs (44) have a reservoir length (l2) and a reservoir width (w2), and said recess lengths (l1) are greater than said reservoir lengths (l2), and said recess widths (w1) are less than said reservoir widths (W2).
9. The piston (20) of claim 1, wherein said piston skirt (30) has a predetermined longitudinal skirt length (ls), and said at least one oil reservoir (44) and said at least one oil recess (46) are spaced from one another by approximately fifty percent (50%) of said predetermined longitudinal skirt length (ls).
10. The piston (20) of claim 1, wherein said at least one oil recess (46) is located closer to a bottom end (32) of said piston skirt (30) than to said pin bore axis (P).
11. The piston (20) of claim 1, wherein said at least one oil reservoir (44) is located closer to a top end of said piston skirt (30) than to said pin bore axis (P).
12. The piston (20) of claim 1, wherein said at least one oil recess (46) is disposed at least in part along a bottom end (32) of said piston skirt (30).
13. The piston (20) of claim 1, wherein said convex profile of said outer surface (42) and said at least one oil reservoir (44) and said at least one oil recess (46) are symmetrical about said longitudinal axis (L).
14. A piston (20) as set forth in claim 1, wherein each of said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) extend over an area of said outer surface (42) having a rectangular shape.
15. A piston (20) as set forth in claim 1, wherein each of said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) extend over an area of said outer surface (42) having a triangular shape.
16. A piston (20) as set forth in claim 1, wherein said piston skirt (30) includes a pair of said outer surfaces (42) facing opposite one another and each including said at least one oil reservoir (44) and said at least one oil recess (46).
17. A piston (20) as set forth in claim 16, wherein said at least one oil reservoir (44) and said at least one oil recess (46) on one of said outer surfaces (42) together extend over a smaller area than said at least one oil reservoir (44) and said at least one oil recess (46) on the other outer surface (42).
18. A piston (20) as set forth in claim 1, wherein said radiused corners (54) or edges completely surround said bottom (50) of said at least one oil reservoir (44) and said at least one oil recess (46).
19. A piston (20) for an internal combustion engine comprising:
a piston body (22) extending along a longitudinal axis (L),
said piston body (22) including a ring belt (24) having a plurality of ring grooves (26) comprising an annular shape,
a piston ring (28) disposed in each of said ring grooves (26),
said piston body (22) including a piston skirt (30) extending a predetermined longitudinal skirt length (ls) from said ring belt (24) to a bottom end (32),
said piston skirt (30) having a pair of sides (34) including pin bosses (36) with pin bores (38) aligned along a pin bore axis (P) that is transverse to said longitudinal axis (L),
said piston skirt (30) including a pair of outer surfaces (42) facing opposite one another and separated from one another by said sides (34) of said piston body (22),
each of said outer surfaces (42) comprising a convex profile in the circumferential direction of said piston skirt (30),
said convex profiles of each of said outer surfaces (42) being symmetrical about said longitudinal axis (L),
each of said outer surfaces (42) of said piston skirt (30) including at least one oil reservoir (44) disposed above said pin bore axis (P) and at least one oil recess (46) disposed below said pin bore axis (P) and spaced longitudinally from said oil reservoir (44) by an intervening oil spreading area (48) of said piston skirt (30),
said at least one oil reservoir (44) and said at least one oil recess (46) each including a bottom (50) extending over an area of said outer surface (42) and having a rectangular shape,
said bottom having a bottom depth (db) between about 10 microns and about 50 microns,
said bottom depths (db) being approximately uniform throughout said corresponding area having a rectangular shape,
said bottom depth (db) of said at least one oil reservoir (44) being greater than said bottom depth (db) of said at least one oil recess (46),
said at least one oil reservoir (44) and said at least one oil recess (46) having radiused corners (54) or edges at a transition between said outer surface (42) of said piston skirt (30) and at said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46), such that said at least one oil reservoir (44) and said at least one oil recess (46) are free of sharp edges or corners,
said at least one oil reservoir (44) and said at least one oil recess (46) having ramped side walls (52) transitioning to said outer surface (42) of said piston skirt (30) and said bottoms (50) of said at least one oil reservoir (44) and said at least one oil recess (46) by said radiused corners (54),
said ramped side walls (52) having a ramp depth (dr) decreasing from said bottom (50) to said outer surface (42),
said at least one oil reservoir (44) and said at least one oil recess (46) being symmetrical about said longitudinal axis (L),
each of said oil recesses (46) having a recess length (l1) and a recess width (w1),
each of said oil reservoirs (44) having a reservoir length (l2) and a reservoir width (w2),
said recess length (l1) being greater than said reservoir length (l2),
said recess width (w1) being less than said reservoir width (w2),
said at least one oil reservoir (44) and said at least one oil recess (46) extending over approximately equally sized areas of said outer surface (42),
said intervening oil spreading area (48) longitudinally spacing said at least one oil reservoir (44) and said at least one oil recess (46) from one another by approximately fifty percent (50%) of said predetermined longitudinal skirt length (ls),
said at least one oil recess (46) being located closer to said bottom end (32) than to said pin bore axis (P), and
said at least one oil reservoir (44) being located closer to said ring belt (24) than to said pin bore axis (P).